JP2021051935A - Method for manufacturing laminate type battery - Google Patents

Method for manufacturing laminate type battery Download PDF

Info

Publication number
JP2021051935A
JP2021051935A JP2019174663A JP2019174663A JP2021051935A JP 2021051935 A JP2021051935 A JP 2021051935A JP 2019174663 A JP2019174663 A JP 2019174663A JP 2019174663 A JP2019174663 A JP 2019174663A JP 2021051935 A JP2021051935 A JP 2021051935A
Authority
JP
Japan
Prior art keywords
negative electrode
positive electrode
tab
base material
fixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2019174663A
Other languages
Japanese (ja)
Other versions
JP6835925B1 (en
Inventor
野上　光秀
Mitsuhide Nogami
光秀 野上
和徳 小関
Kazunori Koseki
和徳 小関
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP2019174663A priority Critical patent/JP6835925B1/en
Priority to CN202080005511.6A priority patent/CN114391193A/en
Priority to PCT/JP2020/036111 priority patent/WO2021060399A1/en
Application granted granted Critical
Publication of JP6835925B1 publication Critical patent/JP6835925B1/en
Publication of JP2021051935A publication Critical patent/JP2021051935A/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

To suppress a worsening of a performance of a laminate type battery while preventing an electrode plate from being out of position.SOLUTION: A laminate type battery comprises: an outer packaging body; a membrane-electrode assembly having a plurality of first electrode plates and a plurality of second electrode plates which are laminated to alternate in a laminating direction; and a first tab disposed on one side of the membrane-electrode assembly. The first electrode plates include a first electrode current collector including a first connection region and a first effective region which are adjacent to each other, and a first electrode active material layer provided in the first effective region, the plurality of the first connection regions are superposed on each other to form a first connection part, and the first tab is joined to the first connection part. The first connection part includes a first fixing part provided at a location different from that of the first tab when viewed from the laminating direction, and the first connection regions are fixed to each other in the first fixing part.SELECTED DRAWING: Figure 3

Description

本発明は、積層型電池および積層型電池の製造方法に関する。 The present invention relates to a laminated battery and a method for manufacturing a laminated battery.

例えば特許文献１で提案されているように、正極板と負極板とを交互に積層してなる積層型電池が広く普及している。積層型電池の一例として、リチウムイオン二次電池が例示され得る。リチウムイオン二次電池は、他の形式の積層型電池と比較して大容量であることを特徴の一つとしている。このような特徴を有するリチウムイオン二次電池は、今般、車載用途や定置住宅用途等の種々の用途での更なる普及を期待されている。 For example, as proposed in Patent Document 1, a laminated battery in which positive electrode plates and negative electrode plates are alternately laminated is widely used. As an example of the laminated battery, a lithium ion secondary battery can be exemplified. One of the features of the lithium-ion secondary battery is that it has a larger capacity than other types of stacked batteries. Lithium-ion secondary batteries having such characteristics are expected to be further spread in various applications such as in-vehicle applications and stationary housing applications.

積層型電池は、積層方向に交互に積層された複数の正極板および複数の負極板を有する膜電極接合体を備えている。積層型電池の製造時において、まず、複数の正極板および複数の負極板が、積層方向に交互に積層されて電極積層体が得られる。次に、電極積層体にタブが接合されて膜電極接合体が得られる。そして、膜電極接合体が外装体内に封止されて積層型電池が得られる。 The laminated battery includes a membrane electrode assembly having a plurality of positive electrode plates and a plurality of negative electrode plates that are alternately laminated in the stacking direction. At the time of manufacturing a laminated battery, first, a plurality of positive electrode plates and a plurality of negative electrode plates are alternately laminated in the stacking direction to obtain an electrode laminate. Next, the tab is bonded to the electrode laminate to obtain a membrane electrode assembly. Then, the membrane electrode assembly is sealed inside the exterior body to obtain a laminated battery.

積層型電池の製造時において、電極板を積層してからタブを接合するまでの間に、各電極板が互いに位置ずれを起こすことが考えられる。このような電極板の位置ずれを防止するために、各電極板の電極活物質層を挟持するように膜電極接合体の縁部にテープを貼り付ける場合がある。 When manufacturing a laminated battery, it is conceivable that the electrode plates are displaced from each other between the time when the electrode plates are laminated and the time when the tabs are joined. In order to prevent such misalignment of the electrode plates, a tape may be attached to the edge of the membrane electrode assembly so as to sandwich the electrode active material layer of each electrode plate.

特開２０１７−９１６１４号公報JP-A-2017-91614

しかしながら、このテープを貼り付けた状態で膜電極接合体を外装体内に封止した場合、テープが貼り付けられた位置で電極板間の間隔が狭くなり得る。この場合、充電時および放電時に反応ムラが生じ、積層型電池の性能が低下するおそれがある。 However, when the membrane electrode assembly is sealed inside the exterior body with this tape attached, the distance between the electrode plates may be narrowed at the position where the tape is attached. In this case, uneven reaction may occur during charging and discharging, and the performance of the laminated battery may deteriorate.

本発明は、このような点を考慮してなされたものであり、電極板の位置ずれを防止しつつ、積層型電池の性能低下を抑制することができる積層型電池および積層型電池の製造方法を提供することを目的とする。 The present invention has been made in consideration of such a point, and is a method for manufacturing a laminated battery and a laminated battery capable of suppressing a deterioration in the performance of the laminated battery while preventing the displacement of the electrode plate. The purpose is to provide.

本発明による積層型電池は、
封止空間を形成する外装体と、
前記封止空間に設けられた膜電極接合体であって、積層方向に交互に積層された複数の第１電極板および複数の第２電極板を有する膜電極接合体と、
前記積層方向で見たときの第１方向において前記膜電極接合体の一側に配置された第１タブと、を備え、
前記第１電極板は、互いに隣接する第１接続領域および第１有効領域を含む第１電極集電体と、前記第１有効領域に設けられた第１電極活物質層と、を含み、
複数の前記第１接続領域が重ね合わされて第１接続部が形成され、
前記第１タブは、前記第１接続部に接合され、
前記第１接続部は、前記積層方向で見たときに前記第１タブとは異なる位置に設けられた第１固定部であって、前記第１接続領域の各々が互いに固定された第１固定部を含む。 The laminated battery according to the present invention
The exterior body that forms the sealing space and
A membrane electrode assembly provided in the sealing space, the membrane electrode assembly having a plurality of first electrode plates and a plurality of second electrode plates alternately laminated in the stacking direction.
A first tab arranged on one side of the membrane electrode assembly in the first direction when viewed in the stacking direction is provided.
The first electrode plate includes a first electrode current collector including a first connection region and a first effective region adjacent to each other, and a first electrode active material layer provided in the first effective region.
A plurality of the first connection regions are overlapped to form a first connection portion, and the first connection portion is formed.
The first tab is joined to the first connection portion and is joined to the first connection portion.
The first connection portion is a first fixing portion provided at a position different from that of the first tab when viewed in the stacking direction, and each of the first connection regions is fixed to each other. Includes part.

本発明による積層型電池において、
前記第１固定部は、前記積層方向で見たときに前記第１方向に直交する第２方向において前記第１タブの両側に設けられている、
ようにしてもよい。 In the laminated battery according to the present invention
The first fixing portions are provided on both sides of the first tab in a second direction orthogonal to the first direction when viewed in the stacking direction.
You may do so.

本発明による積層型電池において、
前記第１固定部は、前記積層方向で見たときに前記第１タブから離間している、
ようにしてもよい。 In the laminated battery according to the present invention
The first fixing portion is separated from the first tab when viewed in the stacking direction.
You may do so.

本発明による積層型電池において、
前記第１固定部は、スポット状に形成されている、
ようにしてもよい。 In the laminated battery according to the present invention
The first fixing portion is formed in a spot shape.
You may do so.

本発明による積層型電池において、
前記積層方向で見たときの前記第１電極板の面積は、２０，０００ｍｍ２以上である、
ようにしてもよい。 In the laminated battery according to the present invention
The area of the first electrode plate when viewed in the stacking direction is 20,000 mm 2 or more.
You may do so.

本発明による積層型電池において、
前記第１方向において前記膜電極接合体の他側に配置された第２タブを更に備え、
前記第２電極板は、互いに隣接する第２接続領域および第２有効領域を含む第２電極集電体と、前記第２有効領域に設けられた第２電極活物質層と、を含み、
複数の前記第２接続領域が重ね合わされて第２接続部が形成され、
前記第２タブは、前記第２接続部に接合され、
前記第２接続部は、前記積層方向で見たときに前記第２タブとは異なる位置に設けられた第２固定部であって、前記第２接続領域の各々が互いに固定された第２固定部を含む、
ようにしてもよい。 In the laminated battery according to the present invention
Further comprising a second tab located on the other side of the membrane electrode assembly in the first direction.
The second electrode plate includes a second electrode current collector including a second connection region and a second effective region adjacent to each other, and a second electrode active material layer provided in the second effective region.
A plurality of the second connection regions are overlapped to form a second connection portion, and the second connection portion is formed.
The second tab is joined to the second connection portion and is joined to the second connection portion.
The second connecting portion is a second fixing portion provided at a position different from that of the second tab when viewed in the stacking direction, and each of the second connecting regions is fixed to each other. Including part,
You may do so.

本発明による積層型電池において、
前記第２固定部は、前記積層方向で見たときに前記第１方向に直交する第２方向において前記第２タブの両側に設けられている、
ようにしてもよい。 In the laminated battery according to the present invention
The second fixing portions are provided on both sides of the second tab in a second direction orthogonal to the first direction when viewed in the stacking direction.
You may do so.

本発明による積層型電池において、
前記第２固定部は、前記積層方向で見たときに前記第２タブから離間している、
ようにしてもよい。 In the laminated battery according to the present invention
The second fixing portion is separated from the second tab when viewed in the stacking direction.
You may do so.

本発明による積層型電池において、
前記第２固定部は、スポット状に形成されている、
ようにしてもよい。 In the laminated battery according to the present invention
The second fixing portion is formed in a spot shape.
You may do so.

本発明による積層型電池において、
前記積層方向で見たときの前記第２電極板の面積は、２０，０００ｍｍ２以上である、
ようにしてもよい。 In the laminated battery according to the present invention
The area of the second electrode plate when viewed in the stacking direction is 20,000 mm 2 or more.
You may do so.

本発明による積層型電池において、
前記外装体は、金属層と前記金属層の内面に設けられた樹脂接着層とを含む第１基材と、前記第１基材に対向する第２基材と、を有し、前記第１基材と前記第２基材とをヒートシールして、前記第１基材と前記第２基材との間に前記封止空間を形成する、
ようにしてもよい。 In the laminated battery according to the present invention
The exterior body has a first base material including a metal layer and a resin adhesive layer provided on the inner surface of the metal layer, and a second base material facing the first base material, and the first base material is provided. The base material and the second base material are heat-sealed to form the sealing space between the first base material and the second base material.
You may do so.

本発明による積層型電池の製造方法は、
複数の第１電極板および複数の第２電極板を積層方向に交互に積層して電極積層体を形成する積層工程であって、前記第１電極板は、互いに隣接する第１接続領域および第１有効領域を含む第１電極集電体と、前記第１有効領域に設けられた第１電極活物質層と、を含み、複数の前記第１接続領域が重ね合わされて第１接続部が形成される、積層工程と、
前記積層工程の後、前記第１接続部で前記第１接続領域の各々を互いに固定して、第１固定部を形成する固定工程と、
前記固定工程の後、前記第１接続部に第１タブを接合するとともに、前記第１接続部で前記第１接続領域の各々を互いに接合して、膜電極接合体を得る接合工程と、
外装体内に前記膜電極接合体を封止する封止工程と、を備え、
前記固定工程において、前記第１固定部は、前記積層方向で見たときに、前記接合工程の際に前記第１タブが接合される位置とは異なる位置に形成される。 The method for manufacturing a laminated battery according to the present invention is as follows.
A laminating step of alternately laminating a plurality of first electrode plates and a plurality of second electrode plates in a laminating direction to form an electrode laminate, wherein the first electrode plates have a first connection region and a first electrode plate adjacent to each other. A first electrode current collector including one effective region and a first electrode active material layer provided in the first effective region are included, and a plurality of the first connection regions are overlapped to form a first connection portion. The laminating process and
After the laminating step, a fixing step of fixing each of the first connecting regions to each other at the first connecting portion to form a first fixing portion, and a fixing step.
After the fixing step, a joining step of joining the first tab to the first connecting portion and joining each of the first connecting regions to each other at the first connecting portion to obtain a membrane electrode assembly.
A sealing step for sealing the membrane electrode assembly inside the outer body is provided.
In the fixing step, the first fixing portion is formed at a position different from the position where the first tab is joined in the joining step when viewed in the stacking direction.

本発明による積層型電池の製造方法において、
前記積層工程において、前記第２電極板は、互いに隣接する第２接続領域および第２有効領域を含む第２電極集電体と、前記第２有効領域に設けられた第２電極活物質層と、を含み、複数の前記第２接続領域が重ね合わされて第２接続部が形成され、
前記固定工程において、前記第２接続部で前記第２接続領域の各々が互いに固定されて、第２固定部が形成され、
前記接合工程において、前記第２接続部に第２タブが接合されるとともに、前記第２接続部で前記第２接続領域の各々が互いに接合され、
前記固定工程において、前記第２固定部は、前記積層方向で見たときに、前記接合工程の際に前記第２タブが接合される位置とは異なる位置に形成される、
ようにしてもよい。 In the method for manufacturing a laminated battery according to the present invention,
In the laminating step, the second electrode plate includes a second electrode current collector including a second connecting region and a second effective region adjacent to each other, and a second electrode active material layer provided in the second effective region. , And a plurality of the second connection regions are superposed to form a second connection portion.
In the fixing step, each of the second connecting regions is fixed to each other at the second connecting portion to form a second fixing portion.
In the joining step, the second tab is joined to the second connecting portion, and each of the second connecting regions is joined to each other at the second connecting portion.
In the fixing step, the second fixing portion is formed at a position different from the position where the second tab is joined in the joining step when viewed in the stacking direction.
You may do so.

本発明による積層型電池の製造方法において、
前記封止工程において、前記外装体は、金属層と前記金属層の内面に設けられた樹脂接着層とを含む第１基材と、前記第１基材に対向する第２基材と、を有し、前記第１基材と前記第２基材とをヒートシールして、前記第１基材と前記第２基材との間に前記膜電極接合体が封止される、
ようにしてもよい。 In the method for manufacturing a laminated battery according to the present invention,
In the sealing step, the exterior body includes a first base material including a metal layer and a resin adhesive layer provided on the inner surface of the metal layer, and a second base material facing the first base material. The membrane electrode assembly is sealed between the first base material and the second base material by heat-sealing the first base material and the second base material.
You may do so.

本発明によれば、電極板の位置ずれを防止しつつ、積層型電池の性能低下を抑制することができる。 According to the present invention, it is possible to suppress the deterioration of the performance of the laminated battery while preventing the displacement of the electrode plate.

図１は、実施の形態による積層型電池を示す斜視図である。FIG. 1 is a perspective view showing a stacked battery according to an embodiment. 図２は、図１の積層型電池に含まれる膜電極接合体を示す斜視図である。FIG. 2 is a perspective view showing a membrane electrode assembly included in the laminated battery of FIG. 図３は、図２の平面図である。FIG. 3 is a plan view of FIG. 図４は、図２の膜電極接合体の第２方向ｄ２で見た部分断面図である。FIG. 4 is a partial cross-sectional view of the membrane electrode assembly of FIG. 2 as viewed in the second direction d2. 図５は、図１の積層型電池の第２方向ｄ２で見た断面図である。FIG. 5 is a cross-sectional view of the stacked battery of FIG. 1 as viewed in the second direction d2. 図６は、実施の形態による積層型電池の製造方法において、正極板および負極板を積層する工程を説明するための図である。FIG. 6 is a diagram for explaining a step of laminating a positive electrode plate and a negative electrode plate in the method of manufacturing a laminated battery according to an embodiment. 図７は、実施の形態による積層型電池の製造方法において、各接続領域を互いに固定する工程を説明するための図である。FIG. 7 is a diagram for explaining a step of fixing the connection regions to each other in the method of manufacturing a stacked battery according to the embodiment. 図８は、図７のＡ−Ａ線（Ａ’−Ａ’線）に沿った断面であって、超音波接合機を追加して示す部分断面図である。FIG. 8 is a cross-sectional view taken along the line AA (line A'-A') of FIG. 7, which is a partial cross-sectional view showing an ultrasonic bonding machine additionally. 図９は、実施の形態による積層型電池の製造方法において、電極積層体にタブを接合する工程を説明するための図である。FIG. 9 is a diagram for explaining a step of joining tabs to the electrode laminate in the method of manufacturing a stacked battery according to the embodiment. 図１０は、図９のＢ−Ｂ線（Ｂ’−Ｂ’線）に沿った断面であって、超音波接合機を追加して示す部分断面図である。FIG. 10 is a cross-sectional view taken along the line BB (line B'-B') of FIG. 9, which is a partial cross-sectional view showing an ultrasonic bonding machine additionally.

以下、図面を参照して本発明の実施の形態について説明する。なお、本件明細書に添付する図面においては、理解のしやすさの便宜上、適宜縮尺および縦横の寸法比等を、実物のそれらから変更し誇張してある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the sake of ease of understanding.

［積層型電池］
図１〜図５は、本発明の実施の形態による積層型電池を説明するための図である。 [Stacked battery]
1 to 5 are views for explaining a laminated battery according to an embodiment of the present invention.

図１および図２に示すように、本実施の形態による積層型電池１は、外装体４０と、外装体４０内に収容された膜電極接合体５と、膜電極接合体５に接続された一対のタブ１６，２６と、を備えている。タブ１６，２６は、外装体４０の外側に延び出ている。電気自動車等の自動車の分野においては、複数の積層型電池１を組み合わせることにより構成されるモジュールが自動車に搭載される。複数の積層型電池１の間の電気的な接続は、タブ１６，２６を介して実現される。 As shown in FIGS. 1 and 2, the laminated battery 1 according to the present embodiment is connected to the exterior body 40, the membrane electrode assembly 5 housed in the exterior body 40, and the membrane electrode assembly 5. It includes a pair of tabs 16 and 26. The tabs 16 and 26 extend to the outside of the exterior body 40. In the field of automobiles such as electric vehicles, a module composed of a combination of a plurality of laminated batteries 1 is mounted on the automobile. The electrical connection between the plurality of stacked batteries 1 is realized via the tabs 16 and 26.

以下、積層型電池１の各構成要素について説明する。 Hereinafter, each component of the laminated battery 1 will be described.

（外装体）
外装体４０は、膜電極接合体５を封止するための包装材である。外装体４０は、第１基材４１（上側外装体）と、第１基材４１に対向する第２基材４２（下側外装体）と、を有している（図５参照）。本実施の形態においては、第１基材４１と第２基材４２は、別体として構成されている。 (Exterior body)
The exterior body 40 is a packaging material for sealing the membrane electrode assembly 5. The exterior body 40 has a first base material 41 (upper outer body) and a second base material 42 (lower outer body) facing the first base material 41 (see FIG. 5). In the present embodiment, the first base material 41 and the second base material 42 are configured as separate bodies.

第１基材４１は、凸状に形成されている。すなわち、第１基材４１は、周辺部４３と、周辺部４３に対して外側（第２基材４２の側とは反対側）に膨出した膨出部４４と、を有している。一方、第２基材４２は、平坦状に形成されている。第１基材４１の膨出部４４により、第１基材４１と第２基材４２との間に、封止空間４５が画定されている。この封止空間４５に、膜電極接合体５が収容されている。このような膨出部４４は、例えば、平坦状の第１基材４１のうち所望の領域を押圧すること（絞り加工）により形成される。この場合、周辺部４３と膨出部４４は一体的に形成されてもよい。 The first base material 41 is formed in a convex shape. That is, the first base material 41 has a peripheral portion 43 and a bulging portion 44 that bulges outward (the side opposite to the side of the second base material 42) with respect to the peripheral portion 43. On the other hand, the second base material 42 is formed flat. A sealing space 45 is defined between the first base material 41 and the second base material 42 by the bulging portion 44 of the first base material 41. The membrane electrode assembly 5 is housed in the sealing space 45. Such a bulging portion 44 is formed, for example, by pressing a desired region of the flat first base material 41 (drawing). In this case, the peripheral portion 43 and the bulging portion 44 may be integrally formed.

外装体４０は、フレキシブル性を有していてもよい。外装体４０の第１基材４１および第２基材４２はそれぞれ、金属層４０ａと、金属層４０ａの内面に設けられた樹脂接着層４０ｂと、を有するラミネートフィルムで構成されている。金属層４０ａは、高ガスバリア性と成形加工性を有していてもよい。このような金属層４０ａは、アルミニウム箔やステンレス箔等の金属材料により形成されていてもよい。樹脂接着層４０ｂは、金属層４０ａの内面に位置し、金属層４０ａを接合するためのシール層として機能する。樹脂接着層４０ｂは、接着性に加え、絶縁性、耐薬品性、熱可塑性等を有していてもよい。このような樹脂接着層４０ｂは、ポリプロピレン、変性ポリプロピレン、低密度ポリプロピレン、アイオノマー、エチレン・酢酸ビニル等の樹脂材料により形成されていてもよい。 The exterior body 40 may have flexibility. The first base material 41 and the second base material 42 of the exterior body 40 are each composed of a laminated film having a metal layer 40a and a resin adhesive layer 40b provided on the inner surface of the metal layer 40a. The metal layer 40a may have high gas barrier properties and molding processability. Such a metal layer 40a may be formed of a metal material such as aluminum foil or stainless steel foil. The resin adhesive layer 40b is located on the inner surface of the metal layer 40a and functions as a sealing layer for joining the metal layers 40a. The resin adhesive layer 40b may have insulating property, chemical resistance, thermoplasticity, etc. in addition to adhesiveness. Such a resin adhesive layer 40b may be formed of a resin material such as polypropylene, modified polypropylene, low density polypropylene, ionomer, ethylene / vinyl acetate or the like.

本実施の形態においては、積層型電池１は、第１基材４１と第２基材４２との間に膜電極接合体５を配置した後、ラミネート加工される。すなわち、外装体４０の周縁部において、第１基材４１および第２基材４２の各々の内面に形成された樹脂接着層４０ｂがヒートシール（熱溶着）されて、シール部４６が形成される。このようにして、第１基材４１と第２基材４２とが接合されて、外装体４０の内部を封止した封止空間４５に、膜電極接合体５が収容されている。 In the present embodiment, the laminated battery 1 is laminated after arranging the membrane electrode assembly 5 between the first base material 41 and the second base material 42. That is, on the peripheral edge of the exterior body 40, the resin adhesive layer 40b formed on the inner surfaces of the first base material 41 and the second base material 42 is heat-sealed (heat welded) to form the seal portion 46. .. In this way, the membrane electrode assembly 5 is housed in the sealing space 45 in which the first base material 41 and the second base material 42 are joined and the inside of the exterior body 40 is sealed.

本実施の形態においては、外装体４０は、後述するような比較的大きなサイズの正極板１０Ｘおよび負極板２０Ｙを収容する。このため、外装体４０は、比較的大きなサイズを有している。第１方向ｄ１における第１基材４１の寸法は、２００ｍｍ以上であってもよい。また、第２方向ｄ２における第１基材４１の寸法は、１００ｍｍ以上であってもよい。第１方向ｄ１における第２基材４２の寸法および第２方向ｄ２における第２基材４２の寸法は、第１基材４１のそれらの寸法と同程度であってもよい。 In the present embodiment, the exterior body 40 accommodates a relatively large size positive electrode plate 10X and a negative electrode plate 20Y as described later. Therefore, the exterior body 40 has a relatively large size. The size of the first base material 41 in the first direction d1 may be 200 mm or more. Further, the size of the first base material 41 in the second direction d2 may be 100 mm or more. The dimensions of the second base material 42 in the first direction d1 and the dimensions of the second base material 42 in the second direction d2 may be similar to those of the first base material 41.

（膜電極接合体）
膜電極接合体５は、積層方向ｄＬに交互に積層された正極板１０Ｘ（第１電極板）および負極板２０Ｙ（第２電極板）を含む複数の電極板１０Ｘ，２０Ｙを有している。 (Membrane electrode assembly)
The membrane electrode assembly 5 has a plurality of electrode plates 10X and 20Y including a positive electrode plate 10X (first electrode plate) and a negative electrode plate 20Y (second electrode plate) alternately laminated in the stacking direction dL.

本実施の形態においては、膜電極接合体５がリチウムイオン二次電池を構成する例について説明する。この例において、第１電極板は正極板１０Ｘを構成し、第２電極板は負極板２０Ｙを構成するものとする。ただし、以下に説明する作用効果の記載からも理解され得るように、第１電極板が負極板２０Ｙを構成し、第２電極板が正極板１０Ｘを構成してもよい。更には、リチウムイオン二次電池に限定されることなく、第１電極板および第２電極板を交互に積層してなる膜電極接合体５に広く適用され得る。 In the present embodiment, an example in which the membrane electrode assembly 5 constitutes a lithium ion secondary battery will be described. In this example, the first electrode plate constitutes the positive electrode plate 10X, and the second electrode plate constitutes the negative electrode plate 20Y. However, as can be understood from the description of the action and effect described below, the first electrode plate may form the negative electrode plate 20Y, and the second electrode plate may form the positive electrode plate 10X. Further, the present invention is not limited to the lithium ion secondary battery, and can be widely applied to the membrane electrode assembly 5 in which the first electrode plate and the second electrode plate are alternately laminated.

図２〜図４に示すように、正極板１０Ｘおよび負極板２０Ｙは、積層方向ｄＬに沿って交互に配列されて積層されている。本実施の形態においては、積層方向ｄＬにおける膜電極接合体５の最下部および最上部に、負極板２０Ｙが配置されている。膜電極接合体５および積層型電池１は、全体的に偏平形状を有し、積層方向ｄＬへの厚さが薄く、積層方向ｄＬに直交する方向ｄ１，ｄ２に広がっている。 As shown in FIGS. 2 to 4, the positive electrode plate 10X and the negative electrode plate 20Y are alternately arranged and laminated along the stacking direction dL. In the present embodiment, the negative electrode plates 20Y are arranged at the lowermost and uppermost portions of the membrane electrode assembly 5 in the stacking direction dL. The membrane electrode assembly 5 and the laminated battery 1 have a flat shape as a whole, have a thin thickness in the stacking direction dL, and spread in the directions d1 and d2 orthogonal to the stacking direction dL.

正極板１０Ｘおよび負極板２０Ｙは、積層方向ｄＬで見たときに、任意の形状を有していてもよい。図示するように、正極板１０Ｘおよび負極板２０Ｙは、積層方向ｄＬで見たときに、全体的に長方形形状の外輪郭を有していてもよい。積層型電池１は、一対のタブ１６，２６が配列される方向である第１方向ｄ１と、第１方向ｄ１に直交する第２方向ｄ２と、を有している。図示された例においては、第１方向ｄ１が、積層型電池１の長手方向（長さ方向）に相当し、第２方向ｄ２が、積層型電池１の短手方向（幅方向）に相当する。しかしながら、第１方向ｄ１が、積層型電池１の短手方向に相当し、第２方向ｄ２が、積層型電池１の長手方向に相当するようにしてもよい。積層方向ｄＬは、第１方向ｄ１および第２方向ｄ２の両方に直交している。正極板１０Ｘおよび負極板２０Ｙは、第１方向ｄ１にずらして配置されている。より具体的には、複数の正極板１０Ｘは、第１方向ｄ１における一側（図３における右側）に寄って配置され、複数の負極板２０Ｙは、第１方向ｄ１における他側（図３における左側）に寄って配置されている。正極板１０Ｘおよび負極板２０Ｙは、後述する正極有効領域ｂ１および負極有効領域ｂ２において、積層方向ｄＬに重なり合っている。 The positive electrode plate 10X and the negative electrode plate 20Y may have any shape when viewed in the stacking direction dL. As shown in the figure, the positive electrode plate 10X and the negative electrode plate 20Y may have an outer contour having a rectangular shape as a whole when viewed in the stacking direction dL. The laminated battery 1 has a first direction d1 in which a pair of tabs 16 and 26 are arranged, and a second direction d2 orthogonal to the first direction d1. In the illustrated example, the first direction d1 corresponds to the longitudinal direction (length direction) of the laminated battery 1, and the second direction d2 corresponds to the lateral direction (width direction) of the laminated battery 1. .. However, the first direction d1 may correspond to the lateral direction of the laminated battery 1, and the second direction d2 may correspond to the longitudinal direction of the laminated battery 1. The stacking direction dL is orthogonal to both the first direction d1 and the second direction d2. The positive electrode plate 10X and the negative electrode plate 20Y are arranged so as to be offset in the first direction d1. More specifically, the plurality of positive electrode plates 10X are arranged closer to one side in the first direction d1 (right side in FIG. 3), and the plurality of negative electrode plates 20Y are arranged on the other side in the first direction d1 (in FIG. 3). It is located closer to the left side). The positive electrode plate 10X and the negative electrode plate 20Y overlap in the stacking direction dL in the positive electrode effective region b1 and the negative electrode effective region b2, which will be described later.

正極板１０Ｘは、図示するように、シート状の外形状を有している。正極板１０Ｘは、正極集電体１１Ｘ（第１電極集電体）と、正極集電体１１Ｘ上に設けられた正極活物質層１２Ｘ（第１電極活物質層）と、を有している。正極活物質層１２Ｘは、任意の形状を有していてもよいが、図示するように、長方形形状の外輪郭を有していてもよい。リチウムイオン二次電池において、正極板１０Ｘは、放電時にリチウムイオンを吸蔵し、充電時にリチウムイオンを放出する。 As shown in the figure, the positive electrode plate 10X has a sheet-like outer shape. The positive electrode plate 10X has a positive electrode current collector 11X (first electrode current collector) and a positive electrode active material layer 12X (first electrode active material layer) provided on the positive electrode current collector 11X. .. The positive electrode active material layer 12X may have an arbitrary shape, but may have a rectangular outer contour as shown in the figure. In the lithium ion secondary battery, the positive electrode plate 10X occludes lithium ions during discharging and releases lithium ions during charging.

正極集電体１１Ｘは、互いに反対側に位置する第１面１１ａおよび第２面１１ｂを主面として有している。正極活物質層１２Ｘは、正極集電体１１Ｘの第１面１１ａおよび第２面１１ｂの少なくとも一方の面上に形成される。本実施の形態においては、各正極板１０Ｘの正極集電体１１Ｘの両側に、正極活物質層１２Ｘがそれぞれ設けられており、各正極板１０Ｘは、互いに同一に構成され得る。 The positive electrode current collector 11X has a first surface 11a and a second surface 11b located on opposite sides of each other as main surfaces. The positive electrode active material layer 12X is formed on at least one surface of the first surface 11a and the second surface 11b of the positive electrode current collector 11X. In the present embodiment, the positive electrode active material layers 12X are provided on both sides of the positive electrode current collector 11X of each positive electrode plate 10X, and the positive electrode plates 10X can be configured to be the same as each other.

正極集電体１１Ｘおよび正極活物質層１２Ｘは、積層型電池１（リチウムイオン二次電池）に適用され得る種々の材料を用いて種々の製法により、作製され得る。一例として、正極集電体１１Ｘは、アルミニウム箔、または高導電性のカーボン粒子もしくはカーボンナノチューブを塗布したアルミニウム箔によって形成され得る。正極活物質層１２Ｘは、例えば、正極活物質、導電助剤、およびバインダーとなる結着剤を含んでいてもよい。正極活物質層１２Ｘは、正極活物質、導電助剤および結着剤を溶媒に分散させてなる正極用スラリーを、正極集電体１１Ｘをなす材料上に塗工し、続いて乾燥し、その後プレスして高密度化することで、作製され得る。正極活物質は、遷移金属とリチウムを含有していてもよく、１種の遷移金属とリチウムを含有していてもよい。正極活物質としては、例えば、リチウム遷移金属複合酸化物、リチウム含有遷移金属リン酸化合物等が挙げられ、これらを混合して用いてもよい。リチウム遷移金属複合酸化物の遷移金属としては、バナジウム、チタン、クロム、マンガン、鉄、コバルト、ニッケル、銅等であってもよい。リチウム遷移金属複合酸化物の具体例としては、ＬｉＣｏＯ２等のリチウムコバルト複合酸化物、ＬｉＮｉＯ２等のリチウムニッケル複合酸化物、ＬｉＭｎＯ２、ＬｉＭｎ２Ｏ４、Ｌｉ２ＭｎＯ３等のリチウムマンガン複合酸化物、これらのリチウム遷移金属複合酸化物の主体となる遷移金属原子の一部をアルミニウム、チタン、バナジウム、クロム、マンガン、鉄、コバルト、ニッケル、銅、亜鉛、マグネシウム、ガリウム、ジルコニウム等の他の金属で置換した置換物等が挙げられる。当該置換物の具体例としては、例えば、ＬｉＮｉ０．５Ｍｎ０．５Ｏ２、ＬｉＮｉ０．８０Ｃｏ０．１７Ａｌ０．０３Ｏ２、ＬｉＮｉ１／３Ｃｏ１／３Ｍｎ１／３Ｏ２、ＬｉＭｎ１．８Ａｌ０．２Ｏ４、ＬｉＭｎ１．５Ｎｉ０．５Ｏ４等が挙げられる。また、リチウム含有遷移金属リン酸化合物の遷移金属としては、バナジウム、チタン、マンガン、鉄、コバルト、ニッケル等が好ましく、具体例としては、例えば、ＬｉＦｅＰＯ４等のリン酸鉄類、ＬｉＣｏＰＯ４等のリン酸コバルト類、これらのリチウム遷移金属リン酸化合物の主体となる遷移金属原子の一部をアルミニウム、チタン、バナジウム、クロム、マンガン、鉄、コバルト、ニッケル、銅、亜鉛、マグネシウム、ガリウム、ジルコニウム、ニオブ等の他の金属で置換した置換物等が挙げられる。導電助剤としては、グラファイトの微粒子、アセチレンブラック、ケッチェンブラック等のカーボンブラック、ニードルコークス等の無定形炭素の微粒子等、カーボンナノファイバー等が使用されるが、これらに限定されない。結着剤としては、ポリフッ化ビニリデン等のフッ素樹脂が用いられ得る。 The positive electrode current collector 11X and the positive electrode active material layer 12X can be produced by various manufacturing methods using various materials that can be applied to the laminated battery 1 (lithium ion secondary battery). As an example, the positive electrode current collector 11X can be formed of an aluminum foil or an aluminum foil coated with highly conductive carbon particles or carbon nanotubes. The positive electrode active material layer 12X may contain, for example, a positive electrode active material, a conductive auxiliary agent, and a binder serving as a binder. In the positive electrode active material layer 12X, a positive electrode slurry formed by dispersing a positive electrode active material, a conductive auxiliary agent and a binder in a solvent is applied onto a material forming the positive electrode current collector 11X, and then dried, and then dried. It can be produced by pressing to increase the density. The positive electrode active material may contain a transition metal and lithium, or may contain one kind of transition metal and lithium. Examples of the positive electrode active material include a lithium transition metal composite oxide, a lithium-containing transition metal phosphoric acid compound, and the like, and these may be mixed and used. The transition metal of the lithium transition metal composite oxide may be vanadium, titanium, chromium, manganese, iron, cobalt, nickel, copper or the like. Specific examples of the lithium transition metal composite oxide include a lithium cobalt composite oxide such as LiCoO 2 , a lithium nickel composite oxide such as LiNiO 2 , and a lithium manganese composite oxide such as LiMnO 2 , LiMn 2 O 4 , and Li 2 MnO 3. Others such as aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, magnesium, gallium, zirconium, etc. Examples thereof include a substitute substituted with a metal. Specific examples of the substitution product include, for example, LiNi 0.5 Mn 0.5 O 2 , LiNi 0.80 Co 0.17 Al 0.03 O 2 , LiNi 1/3 Co 1/3 Mn 1/3 O. 2 , LiMn 1.8 Al0.2 O 4 , LiMn 1.5 Ni 0.5 O 4, and the like can be mentioned. Further, as the transition metal of the lithium-containing transition metal phosphoric acid compound, vanadium, titanium, manganese, iron, cobalt, nickel and the like are preferable, and specific examples thereof include iron phosphates such as LiFePO 4 and LiCoPO 4 . Cobalt phosphates, some of the transition metal atoms that are the main constituents of these lithium transition metal phosphate compounds are aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, magnesium, gallium, zirconium, Examples thereof include substitutions substituted with other metals such as niobium. As the conductive auxiliary agent, fine particles of graphite, carbon black such as acetylene black and Ketjen black, fine particles of amorphous carbon such as needle coke, carbon nanofibers and the like are used, but the present invention is not limited thereto. As the binder, a fluororesin such as polyvinylidene fluoride can be used.

図３に示すように、正極集電体１１Ｘは、互いに隣接する正極接続領域ａ１（第１接続領域）および正極有効領域ｂ１（第１有効領域）を有している。正極活物質層１２Ｘは、正極集電体１１Ｘの正極有効領域ｂ１のみに配置されている。正極有効領域ｂ１は、任意の形状を有していてもよい。図示するように、正極有効領域ｂ１は、長方形形状の外輪郭を有していてもよく、全体的に正極活物質層１２Ｘが設けられた領域になっていてもよい。正極接続領域ａ１および正極有効領域ｂ１は、正極板１０Ｘの第１方向ｄ１に配列されている。正極接続領域ａ１は、正極有効領域ｂ１よりも正極板１０Ｘの第１方向ｄ１における外側（図３における右側）に位置している。 As shown in FIG. 3, the positive electrode current collector 11X has a positive electrode connection region a1 (first connection region) and a positive electrode effective region b1 (first effective region) adjacent to each other. The positive electrode active material layer 12X is arranged only in the positive electrode effective region b1 of the positive electrode current collector 11X. The positive electrode effective region b1 may have an arbitrary shape. As shown in the figure, the positive electrode effective region b1 may have a rectangular outer contour, or may be a region provided with the positive electrode active material layer 12X as a whole. The positive electrode connection region a1 and the positive electrode effective region b1 are arranged in the first direction d1 of the positive electrode plate 10X. The positive electrode connection region a1 is located outside the positive electrode plate 10X in the first direction d1 (right side in FIG. 3) with respect to the positive electrode effective region b1.

各々の正極集電体１１Ｘの正極接続領域ａ１によって、正極接続部１３（第１接続部）が構成されている。正極接続部１３は、第１基材４１の側の面である第１面１３ａと、第２基材４２の側の面である第２面１３ｂと、を有している。第１面１３ａは、複数の正極集電体１１Ｘのうち最も第１基材４１の側に配置された正極集電体１１Ｘの正極接続領域ａ１における第１面１１ａに相当する。また、第２面１３ｂは、複数の正極集電体１１Ｘのうち最も第２基材４２の側に配置された正極集電体１１Ｘの正極接続領域ａ１における第２面１１ｂに相当する。本実施の形態においては、第２面１３ｂに、正極タブ１６（第１タブ）が接合されている（図５参照）。本実施の形態による正極接続部１３は、積層方向ｄＬで見たときに、正極接続部１３の第２方向ｄ２における中央部に設けられた正極タブ接合部１５を有している。正極タブ１６は、この正極タブ接合部１５において抵抗溶接や超音波接合、熱溶着等によって接合されている。また、各々の正極集電体１１Ｘも、この正極タブ接合部１５において互いに接合されている。これにより、各々の正極集電体１１Ｘと正極タブ１６とが電気的に接続されている。 The positive electrode connection portion 13 (first connection portion) is configured by the positive electrode connection region a1 of each positive electrode current collector 11X. The positive electrode connecting portion 13 has a first surface 13a, which is a side surface of the first base material 41, and a second surface 13b, which is a side surface of the second base material 42. The first surface 13a corresponds to the first surface 11a in the positive electrode connection region a1 of the positive electrode current collector 11X arranged on the side of the first base material 41 among the plurality of positive electrode current collectors 11X. Further, the second surface 13b corresponds to the second surface 11b in the positive electrode connection region a1 of the positive electrode current collector 11X arranged closest to the second base material 42 among the plurality of positive electrode current collectors 11X. In the present embodiment, the positive electrode tab 16 (first tab) is joined to the second surface 13b (see FIG. 5). The positive electrode connection portion 13 according to the present embodiment has a positive electrode tab joint portion 15 provided at the central portion in the second direction d2 of the positive electrode connection portion 13 when viewed in the stacking direction dL. The positive electrode tab 16 is bonded at the positive electrode tab joint portion 15 by resistance welding, ultrasonic bonding, heat welding, or the like. Further, the positive electrode current collectors 11X are also joined to each other at the positive electrode tab joint portion 15. As a result, each positive electrode current collector 11X and the positive electrode tab 16 are electrically connected.

また、図３に示すように、本実施の形態による正極接続部１３は、積層方向ｄＬで見たときに正極タブ１６（または正極タブ接合部１５）とは異なる位置に設けられた正極固定部１７ａ，１７ｂ（第１固定部）を有している。正極接続領域ａ１の各々は、正極固定部１７ａ，１７ｂにおいて互いに固定されている。正極固定部１７ａ，１７ｂは、積層方向ｄＬで見たときに正極タブ１６とは異なる位置であれば、正極接続部１３の任意の位置に設けられていてもよい。図示された例においては、正極固定部１７ａ，１７ｂは、第２方向ｄ２において正極タブ１６の両側に設けられている。より具体的には、正極固定部１７ａは、正極タブ１６よりも正極接続部１３の第２方向ｄ２における一側の端部（図３における上側）に近い位置に設けられ、正極固定部１７ｂは、正極タブ１６よりも正極接続部１３の第２方向ｄ２における他側の端部（図３における下側）に近い位置に設けられている。また、正極固定部１７ａ，１７ｂは、積層方向ｄＬで見たときに正極タブ１６から離間しており、正極固定部１７ａ，１７ｂは、スポット状に形成されている。正極固定部１７ａ，１７ｂは、正極接続領域ａ１の各々を互いに固定することができれば、任意の方法により形成されてもよい。例えば、正極固定部１７ａ，１７ｂは、正極タブ１６を正極接続部１３に接合する場合と同様、抵抗溶接や超音波接合、熱溶着等によって形成されてもよい。この場合、各々の正極接続領域ａ１が互いに接合されて固定される。 Further, as shown in FIG. 3, the positive electrode connecting portion 13 according to the present embodiment is provided at a position different from the positive electrode tab 16 (or the positive electrode tab joining portion 15) when viewed in the stacking direction dL. It has 17a and 17b (first fixed portion). Each of the positive electrode connection regions a1 is fixed to each other at the positive electrode fixing portions 17a and 17b. The positive electrode fixing portions 17a and 17b may be provided at arbitrary positions of the positive electrode connecting portion 13 as long as they are at positions different from those of the positive electrode tab 16 when viewed in the stacking direction dL. In the illustrated example, the positive electrode fixing portions 17a and 17b are provided on both sides of the positive electrode tab 16 in the second direction d2. More specifically, the positive electrode fixing portion 17a is provided at a position closer to one end (upper side in FIG. 3) of the positive electrode connecting portion 13 in the second direction d2 than the positive electrode tab 16, and the positive electrode fixing portion 17b is provided. , The positive electrode connecting portion 13 is provided at a position closer to the other end (lower side in FIG. 3) in the second direction d2 than the positive electrode tab 16. Further, the positive electrode fixing portions 17a and 17b are separated from the positive electrode tab 16 when viewed in the stacking direction dL, and the positive electrode fixing portions 17a and 17b are formed in a spot shape. The positive electrode fixing portions 17a and 17b may be formed by any method as long as each of the positive electrode connection regions a1 can be fixed to each other. For example, the positive electrode fixing portions 17a and 17b may be formed by resistance welding, ultrasonic bonding, heat welding, or the like, as in the case where the positive electrode tab 16 is bonded to the positive electrode connecting portion 13. In this case, the positive electrode connection regions a1 are joined to each other and fixed.

一方、図３に示すように、正極有効領域ｂ１は、積層方向ｄＬで見たときに、負極板２０Ｙの後述する負極活物質層２２Ｙに対向する領域内に設けられている。このため、第１方向ｄ１における正極板１０Ｘの正極有効領域ｂ１の寸法は、第１方向ｄ１における負極板２０Ｙの後述する負極有効領域ｂ２の寸法よりも小さくなっている。また、第２方向ｄ２における正極板１０Ｘの寸法は、第２方向ｄ２における負極板２０Ｙの寸法よりも小さくなっている。このような正極有効領域ｂ１の配置により、負極活物質層２２Ｙからのリチウムの析出を防止することができる。 On the other hand, as shown in FIG. 3, the positive electrode effective region b1 is provided in the region of the negative electrode plate 20Y facing the negative electrode active material layer 22Y, which will be described later, when viewed in the stacking direction dL. Therefore, the size of the positive electrode effective region b1 of the positive electrode plate 10X in the first direction d1 is smaller than the size of the negative electrode effective region b2 of the negative electrode plate 20Y in the first direction d1 which will be described later. Further, the size of the positive electrode plate 10X in the second direction d2 is smaller than the size of the negative electrode plate 20Y in the second direction d2. By arranging the positive electrode effective region b1 in this way, it is possible to prevent the precipitation of lithium from the negative electrode active material layer 22Y.

本実施の形態においては、正極板１０Ｘは、比較的大きなサイズを有している。第１方向ｄ１における正極板１０Ｘの寸法は、１８０ｍｍ以上であってもよい。第１方向ｄ１における正極板１０Ｘの正極有効領域ｂ１の寸法は、１５０ｍｍ以上であってもよい。また、第２方向ｄ２における正極板１０Ｘの寸法は、８０ｍｍ以上であってもよい。また、本実施の形態において、積層方向ｄＬで見たときの正極板１０Ｘの面積は、２０，０００ｍｍ２以上であってもよい。 In the present embodiment, the positive electrode plate 10X has a relatively large size. The size of the positive electrode plate 10X in the first direction d1 may be 180 mm or more. The size of the positive electrode effective region b1 of the positive electrode plate 10X in the first direction d1 may be 150 mm or more. Further, the size of the positive electrode plate 10X in the second direction d2 may be 80 mm or more. Further, in the present embodiment, the area of the positive electrode plate 10X when viewed in the stacking direction dL may be 20,000 mm 2 or more.

次に、負極板２０Ｙについて説明する。負極板２０Ｙも、正極板１０Ｘと同様に、シート状の外形状を有している。負極板２０Ｙは、負極集電体２１Ｙ（第２電極集電体）と、負極集電体２１Ｙ上に設けられた負極活物質層２２Ｙ（第２電極活物質層）と、を有している。負極活物質層２２Ｙは、任意の形状を有していてもよいが、図示するように、長方形形状の外輪郭を有していてもよい。リチウムイオン二次電池において、負極板２０Ｙは、放電時にリチウムイオンを放出し、充電時にリチウムイオンを吸蔵する。 Next, the negative electrode plate 20Y will be described. The negative electrode plate 20Y also has a sheet-like outer shape like the positive electrode plate 10X. The negative electrode plate 20Y has a negative electrode current collector 21Y (second electrode current collector) and a negative electrode active material layer 22Y (second electrode active material layer) provided on the negative electrode current collector 21Y. .. The negative electrode active material layer 22Y may have an arbitrary shape, but may have a rectangular outer contour as shown in the figure. In the lithium ion secondary battery, the negative electrode plate 20Y emits lithium ions at the time of discharging and occludes the lithium ions at the time of charging.

負極集電体２１Ｙは、互いに反対側に位置する第１面２１ａおよび第２面２１ｂを主面として有している。負極活物質層２２Ｙは、負極集電体２１Ｙの第１面２１ａおよび第２面２１ｂの少なくとも一方の面上に形成される。本実施の形態においては、各負極板２０Ｙの負極集電体２１Ｙの両側に、負極活物質層２２Ｙがそれぞれ設けられており、各負極板２０Ｙは、互いに同一に構成され得る。なお、最も第１基材４１の側に配置された負極板２０Ｙの負極集電体２１Ｙの第１面２１ａには、負極活物質層２２Ｙは設けられていなくてもよい。また、最も第２基材４２の側に配置された負極板２０Ｙの負極集電体２１Ｙの第２面２１ｂにも、負極活物質層２２Ｙは設けられていなくてもよい。 The negative electrode current collector 21Y has a first surface 21a and a second surface 21b located on opposite sides of each other as main surfaces. The negative electrode active material layer 22Y is formed on at least one of the first surface 21a and the second surface 21b of the negative electrode current collector 21Y. In the present embodiment, the negative electrode active material layers 22Y are provided on both sides of the negative electrode current collector 21Y of each negative electrode plate 20Y, and the negative electrode plates 20Y can be configured to be the same as each other. The negative electrode active material layer 22Y may not be provided on the first surface 21a of the negative electrode current collector 21Y of the negative electrode plate 20Y arranged closest to the first base material 41. Further, the negative electrode active material layer 22Y may not be provided on the second surface 21b of the negative electrode current collector 21Y of the negative electrode plate 20Y arranged closest to the second base material 42.

負極集電体２１Ｙおよび負極活物質層２２Ｙは、積層型電池１（リチウムイオン二次電池）に適用され得る種々の材料を用いて種々の製法により、作製され得る。一例として、負極集電体２１Ｙは、例えば銅箔によって形成される。負極活物質層２２Ｙは、例えば、負極活物質、導電助剤、バインダーとなる結着剤、および増粘剤を含んでいてもよい。負極活物質層２２Ｙは、負極活物質、導電助剤、結着剤および増粘剤を溶媒に分散させてなる負極用スラリーを、負極集電体２１Ｙをなす材料上に塗工し、続いて乾燥し、その後プレスして高密度化することで、作製され得る。負極活物質としては、例えば、金属リチウム、リチウム合金、リチウムイオンを吸蔵および放出し得る炭素系材料（炭素粉末、黒鉛粉末等）、金属酸化物等が挙げられる。導電助剤としては、例えば、アセチレンブラック、カーボンナノチューブ等が挙げられる。結着材としては、例えば、ポリフッ化ビニリデン等のフッ素樹脂、スチレンブタジエンゴム等が挙げられる。増粘剤としては、例えば、カルボキシメチルセルロース等が挙げられる。 The negative electrode current collector 21Y and the negative electrode active material layer 22Y can be produced by various manufacturing methods using various materials that can be applied to the laminated battery 1 (lithium ion secondary battery). As an example, the negative electrode current collector 21Y is formed of, for example, a copper foil. The negative electrode active material layer 22Y may contain, for example, a negative electrode active material, a conductive auxiliary agent, a binder serving as a binder, and a thickener. In the negative electrode active material layer 22Y, a slurry for a negative electrode formed by dispersing a negative electrode active material, a conductive auxiliary agent, a binder and a thickener in a solvent is applied onto a material forming the negative electrode current collector 21Y, followed by coating. It can be made by drying and then pressing to densify. Examples of the negative electrode active material include metallic lithium, lithium alloys, carbon-based materials capable of occluding and releasing lithium ions (carbon powder, graphite powder, etc.), metal oxides, and the like. Examples of the conductive auxiliary agent include acetylene black and carbon nanotubes. Examples of the binder include fluororesins such as polyvinylidene fluoride and styrene-butadiene rubber. Examples of the thickener include carboxymethyl cellulose and the like.

図３に示すように、負極集電体２１Ｙは、互いに隣接する負極接続領域ａ２（第２接続領域）および負極有効領域ｂ２（第２有効領域）を有している。負極活物質層２２Ｙは、負極集電体２１Ｙの負極有効領域ｂ２のみに配置されている。負極有効領域ｂ２は、任意の形状を有していてもよい。図示するように、負極有効領域ｂ２は、長方形形状の外輪郭を有していてもよく、全体的に負極活物質層２２Ｙが設けられた領域になっていてもよい。負極接続領域ａ２および負極有効領域ｂ２は、負極板２０Ｙの第１方向ｄ１に配列されている。負極接続領域ａ２は、負極有効領域ｂ２よりも負極板２０Ｙの第１方向ｄ１における外側（図３における左側）に位置している。 As shown in FIG. 3, the negative electrode current collector 21Y has a negative electrode connection region a2 (second connection region) and a negative electrode effective region b2 (second effective region) adjacent to each other. The negative electrode active material layer 22Y is arranged only in the negative electrode effective region b2 of the negative electrode current collector 21Y. The negative electrode effective region b2 may have an arbitrary shape. As shown in the figure, the negative electrode effective region b2 may have a rectangular outer contour, or may be a region provided with the negative electrode active material layer 22Y as a whole. The negative electrode connection region a2 and the negative electrode effective region b2 are arranged in the first direction d1 of the negative electrode plate 20Y. The negative electrode connection region a2 is located outside the negative electrode plate 20Y in the first direction d1 (left side in FIG. 3) with respect to the negative electrode effective region b2.

各々の負極集電体２１Ｙの負極接続領域ａ２によって、負極接続部２３（第２接続部）が構成されている。負極接続部２３は、第１基材４１の側の面である第１面２３ａと、第２基材４２の側の面である第２面２３ｂと、を有している。第１面２３ａは、複数の負極集電体２１Ｙのうち最も第１基材４１の側に配置された負極集電体２１Ｙの負極接続領域ａ２における第１面２１ａに相当する。また、第２面２３ｂは、複数の負極集電体２１Ｙのうち最も第２基材４２の側に配置された負極集電体２１Ｙの負極接続領域ａ２における第２面２１ｂに相当する。本実施の形態においては、第２面２３ｂに、負極タブ２６（第２タブ）が接合されている（図５参照）。本実施の形態による負極接続部２３は、積層方向ｄＬで見たときに、負極接続部２３の第２方向ｄ２における中央部に設けられた負極タブ接合部２５を有している。負極タブ２６は、この負極タブ接合部２５において抵抗溶接や超音波接合、熱溶着等によって接合されている。また、各々の負極集電体２１Ｙも、この負極タブ接合部２５において互いに接合されている。これにより、各々の負極集電体２１Ｙと負極タブ２６とが電気的に接続されている。 The negative electrode connection portion 23 (second connection portion) is configured by the negative electrode connection region a2 of each negative electrode current collector 21Y. The negative electrode connecting portion 23 has a first surface 23a, which is a side surface of the first base material 41, and a second surface 23b, which is a side surface of the second base material 42. The first surface 23a corresponds to the first surface 21a in the negative electrode connection region a2 of the negative electrode current collector 21Y arranged closest to the first base material 41 among the plurality of negative electrode current collectors 21Y. Further, the second surface 23b corresponds to the second surface 21b in the negative electrode connection region a2 of the negative electrode current collector 21Y arranged closest to the second base material 42 among the plurality of negative electrode current collectors 21Y. In the present embodiment, the negative electrode tab 26 (second tab) is joined to the second surface 23b (see FIG. 5). The negative electrode connecting portion 23 according to the present embodiment has a negative electrode tab joint portion 25 provided at the center of the negative electrode connecting portion 23 in the second direction d2 when viewed in the stacking direction dL. The negative electrode tab 26 is bonded at the negative electrode tab joint portion 25 by resistance welding, ultrasonic bonding, heat welding, or the like. Further, the negative electrode current collectors 21Y are also joined to each other at the negative electrode tab joint portion 25. As a result, each negative electrode current collector 21Y and the negative electrode tab 26 are electrically connected.

また、図３に示すように、本実施の形態による負極接続部２３は、積層方向ｄＬで見たときに負極タブ２６（または負極タブ接合部２５）とは異なる位置に設けられた負極固定部２７ａ，２７ｂ（第２固定部）を有している。負極接続領域ａ２の各々は、負極固定部２７ａ，２７ｂにおいて互いに固定されている。負極固定部２７ａ，２７ｂは、積層方向ｄＬで見たときに負極タブ２６とは異なる位置であれば、負極接続部２３の任意の位置に設けられていてもよい。図示された例においては、負極固定部２７ａ，２７ｂは、第２方向ｄ２において負極タブ２６の両側に設けられている。より具体的には、負極固定部２７ａは、負極タブ２６よりも負極接続部２３の第２方向ｄ２における一側の端部（図３における上側）に近い位置に設けられ、負極固定部２７ｂは、負極タブ２６よりも負極接続部２３の第２方向ｄ２における他側の端部（図３における下側）に近い位置に設けられている。また、負極固定部２７ａ，２７ｂは、積層方向ｄＬで見たときに負極タブ２６から離間しており、負極固定部２７ａ，２７ｂは、スポット状に形成されている。負極固定部２７ａ，２７ｂは、負極接続領域ａ２の各々を互いに固定することができれば、任意の方法により形成されてもよい。例えば、負極固定部２７ａ，２７ｂは、負極タブ２６を負極接続部２３に接合する場合と同様、抵抗溶接や超音波接合、熱溶着等によって形成されてもよい。この場合、各々の負極接続領域ａ２が互いに接合されて固定される。 Further, as shown in FIG. 3, the negative electrode connecting portion 23 according to the present embodiment is provided at a position different from the negative electrode tab 26 (or the negative electrode tab joint portion 25) when viewed in the stacking direction dL. It has 27a and 27b (second fixed portion). Each of the negative electrode connection regions a2 is fixed to each other at the negative electrode fixing portions 27a and 27b. The negative electrode fixing portions 27a and 27b may be provided at arbitrary positions of the negative electrode connecting portion 23 as long as they are at different positions from the negative electrode tab 26 when viewed in the stacking direction dL. In the illustrated example, the negative electrode fixing portions 27a and 27b are provided on both sides of the negative electrode tab 26 in the second direction d2. More specifically, the negative electrode fixing portion 27a is provided at a position closer to one end (upper side in FIG. 3) of the negative electrode connecting portion 23 in the second direction d2 than the negative electrode tab 26, and the negative electrode fixing portion 27b is provided. The negative electrode connecting portion 23 is provided at a position closer to the other end (lower side in FIG. 3) in the second direction d2 than the negative electrode tab 26. Further, the negative electrode fixing portions 27a and 27b are separated from the negative electrode tab 26 when viewed in the stacking direction dL, and the negative electrode fixing portions 27a and 27b are formed in a spot shape. The negative electrode fixing portions 27a and 27b may be formed by any method as long as each of the negative electrode connecting regions a2 can be fixed to each other. For example, the negative electrode fixing portions 27a and 27b may be formed by resistance welding, ultrasonic bonding, heat welding, or the like, as in the case of bonding the negative electrode tab 26 to the negative electrode connecting portion 23. In this case, the negative electrode connection regions a2 are joined to each other and fixed.

一方、図３に示すように、負極有効領域ｂ２は、積層方向ｄＬで見たときに、正極板１０Ｘの正極活物質層１２Ｘに対向する領域を内包するように広がっている。すなわち、負極有効領域ｂ２は、積層方向ｄＬで見たときに、全周に亘って、正極活物質層１２Ｘの外側にはみ出すように広がっている。このため、上述したように、第１方向ｄ１における負極板２０Ｙの負極有効領域ｂ２の寸法は、第１方向ｄ１における正極板１０Ｘの正極有効領域ｂ１の寸法よりも大きくなっている。また、第２方向ｄ２における負極板２０Ｙの寸法は、第２方向ｄ２における正極板１０Ｘの寸法よりも大きくなっている。 On the other hand, as shown in FIG. 3, the negative electrode effective region b2 extends so as to include a region of the positive electrode plate 10X facing the positive electrode active material layer 12X when viewed in the stacking direction dL. That is, the negative electrode effective region b2 extends so as to protrude to the outside of the positive electrode active material layer 12X over the entire circumference when viewed in the stacking direction dL. Therefore, as described above, the size of the negative electrode effective region b2 of the negative electrode plate 20Y in the first direction d1 is larger than the size of the positive electrode effective region b1 of the positive electrode plate 10X in the first direction d1. Further, the size of the negative electrode plate 20Y in the second direction d2 is larger than the size of the positive electrode plate 10X in the second direction d2.

本実施の形態においては、負極板２０Ｙは、比較的大きなサイズを有している。第１方向ｄ１における負極板２０Ｙの寸法は、１８０ｍｍ以上であってもよい。第１方向ｄ１における負極板２０Ｙの負極有効領域ｂ２の寸法は、１５０ｍｍ以上であってもよい。また、第２方向ｄ２における負極板２０Ｙの寸法は、８０ｍｍ以上であってもよい。また、本実施の形態において、積層方向ｄＬで見たときの負極板２０Ｙの面積は、２０，０００ｍｍ２以上であってもよい。 In the present embodiment, the negative electrode plate 20Y has a relatively large size. The size of the negative electrode plate 20Y in the first direction d1 may be 180 mm or more. The size of the negative electrode effective region b2 of the negative electrode plate 20Y in the first direction d1 may be 150 mm or more. Further, the size of the negative electrode plate 20Y in the second direction d2 may be 80 mm or more. Further, in the present embodiment, the area of the negative electrode plate 20Y when viewed in the stacking direction dL may be 20,000 mm 2 or more.

図４に示すように、正極板１０Ｘおよび負極板２０Ｙの間に絶縁シート３１が配置されていてもよい。絶縁シート３１は、正極板１０Ｘと負極板２０Ｙとの間に介在されて、セパレータとして機能する。図４に示す例では、絶縁シート３１は、正極板１０Ｘの後述する機能層３０Ａと負極板２０Ｙの負極活物質層２２Ｙとの間に配置されている。このような絶縁シート３１は、例えば、不織布や多孔質材から形成され得る。この例において、外装体４０内に収容された電解液またはゲル状電解液が、絶縁シート３１に含浸して保持される。この例に用いられる絶縁シート３１は、特に限定されることはなく、積層型電池１、とりわけリチウムイオン二次電池に適用され得る種々の絶縁体を用いることができる。 As shown in FIG. 4, the insulating sheet 31 may be arranged between the positive electrode plate 10X and the negative electrode plate 20Y. The insulating sheet 31 is interposed between the positive electrode plate 10X and the negative electrode plate 20Y and functions as a separator. In the example shown in FIG. 4, the insulating sheet 31 is arranged between the functional layer 30A of the positive electrode plate 10X, which will be described later, and the negative electrode active material layer 22Y of the negative electrode plate 20Y. Such an insulating sheet 31 can be formed of, for example, a non-woven fabric or a porous material. In this example, the electrolytic solution or the gel-like electrolytic solution contained in the exterior body 40 is impregnated into the insulating sheet 31 and held. The insulating sheet 31 used in this example is not particularly limited, and various insulators applicable to the laminated battery 1, particularly the lithium ion secondary battery, can be used.

また、図４に示すように、正極板１０Ｘおよび負極板２０Ｙの少なくとも一方が、他方に対向する面に機能層３０Ａを有していてもよい。機能層３０Ａは、絶縁性を有し、正極板１０Ｘおよび負極板２０Ｙが短絡することを防止する。図示された例においては、正極板１０Ｘが機能層３０Ａを有している。機能層３０Ａは、正極活物質層１２Ｘの絶縁シート３１の側の面（絶縁シート３１に対向する面）に設けられている。すなわち、各正極活物質層１２Ｘの対向する絶縁シート３１の側の面に機能層３０Ａが設けられている。各正極活物質層１２Ｘの当該面は、機能層３０Ａにより覆われている。そして、正極板１０Ｘのうち絶縁シート３１と積層方向ｄＬに対向する面が、機能層３０Ａによって形成されている。なお、図４に示す機能層３０Ａの代わりに、あるいは加えて、負極板２０Ｙが、各負極活物質層２２Ｙを覆う機能層３０Ａを有することも可能である。 Further, as shown in FIG. 4, at least one of the positive electrode plate 10X and the negative electrode plate 20Y may have the functional layer 30A on the surface facing the other. The functional layer 30A has an insulating property and prevents the positive electrode plate 10X and the negative electrode plate 20Y from being short-circuited. In the illustrated example, the positive electrode plate 10X has a functional layer 30A. The functional layer 30A is provided on the surface of the positive electrode active material layer 12X on the side of the insulating sheet 31 (the surface facing the insulating sheet 31). That is, the functional layer 30A is provided on the surface of each positive electrode active material layer 12X on the opposite side of the insulating sheet 31. The surface of each positive electrode active material layer 12X is covered with the functional layer 30A. The surface of the positive electrode plate 10X facing the insulating sheet 31 in the stacking direction dL is formed by the functional layer 30A. In addition to or in addition to the functional layer 30A shown in FIG. 4, the negative electrode plate 20Y may have a functional layer 30A covering each negative electrode active material layer 22Y.

機能層３０Ａは、負極活物質層２２Ｙよりも高い空孔率を有していてもよい。また、機能層３０Ａは、優れた耐熱性を有していてもよい。このような機能層３０Ａの材料には、無機材料を用いてもよい。無機材料は、高い空孔率とともに優れた耐熱性、例えば１５０℃以上の耐熱性を機能層３０Ａに付与することができる。無機材料としては、二酸化ケイ素、窒化ケイ素、アルミナ、ベーマイト、チタニア、ジルコニア、窒化ホウ素、酸化亜鉛、二酸化スズ、酸化ニオブ（Ｎｂ２Ｏ５）、酸化タンタル（Ｔａ２Ｏ５）、フッ化カリウム、フッ化リチウム、クレイ、ゼオライト、炭酸カルシウム、ニオブ−タンタル複合酸化物及びマグネシウム−タンタル複合酸化物等が挙げられる。また、機能層３０Ａの材料には、有機材料を用いてもよい。有機材料としては、セルロースおよびその変成体、ポリオレフィン、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリプロピレン、ポリエステル、ポリアクリロニトリル、アラミド、ポリアミドイミド、ポリイミド等の繊維状物や粒子状物が挙げられる。機能層３０Ａは、アルミナで形成する場合には、正極活物質層１２Ｘ上に塗工して固化させることで、作製され得る。 The functional layer 30A may have a higher porosity than the negative electrode active material layer 22Y. Further, the functional layer 30A may have excellent heat resistance. An inorganic material may be used as the material of such a functional layer 30A. The inorganic material can impart excellent heat resistance, for example, heat resistance of 150 ° C. or higher to the functional layer 30A together with a high porosity. Inorganic materials include silicon dioxide, silicon nitride, alumina, boehmite, titania, zirconia, boron nitride, zinc oxide, tin dioxide, niobium oxide (Nb 2 O 5 ), tantalum oxide (Ta 2 O 5 ), potassium fluoride, Examples thereof include lithium fluoride, clay, zeolite, calcium carbonate, niob-tantalum composite oxide and magnesium-tantalum composite oxide. Further, an organic material may be used as the material of the functional layer 30A. Examples of the organic material include fibrous substances and particulate substances such as cellulose and its variants, polyolefins, polyethylene terephthalates, polybutylene terephthalates, polypropylenes, polyesters, polyacrylonitriles, aramids, polyamideimides, and polyimides. When the functional layer 30A is formed of alumina, it can be produced by coating it on the positive electrode active material layer 12X and solidifying it.

（タブ）
図２および図３に示すように、第１方向ｄ１において膜電極接合体５の一側（図３における右側）に正極タブ１６が配置されている。上述したように、本実施の形態においては、正極タブ１６は、正極接続部１３の第２面１３ｂに接続されている。また、正極タブ１６は、積層方向ｄＬで見たときに、上述した正極タブ接合部１５において抵抗溶接や超音波接合、熱溶着等によって接合されている。これにより、正極タブ１６は、各々の正極集電体１１Ｘと電気的に接続されている。 (tab)
As shown in FIGS. 2 and 3, the positive electrode tab 16 is arranged on one side (right side in FIG. 3) of the membrane electrode assembly 5 in the first direction d1. As described above, in the present embodiment, the positive electrode tab 16 is connected to the second surface 13b of the positive electrode connecting portion 13. Further, the positive electrode tab 16 is bonded by resistance welding, ultrasonic bonding, heat welding or the like at the positive electrode tab bonding portion 15 described above when viewed in the stacking direction dL. As a result, the positive electrode tab 16 is electrically connected to each positive electrode current collector 11X.

同様に、第１方向ｄ１において膜電極接合体５の他側（図３における左側）に負極タブ２６が配置されている。上述したように、本実施の形態においては、負極タブ２６は、負極接続部２３の第２面２３ｂに接続されている。また、負極タブ２６は、積層方向ｄＬで見たときに、上述した負極タブ接合部２５において抵抗溶接や超音波接合、熱溶着等によって接合されている。これにより、負極タブ２６は、各々の負極集電体２１Ｙと電気的に接続されている。 Similarly, the negative electrode tab 26 is arranged on the other side (left side in FIG. 3) of the membrane electrode assembly 5 in the first direction d1. As described above, in the present embodiment, the negative electrode tab 26 is connected to the second surface 23b of the negative electrode connecting portion 23. Further, the negative electrode tab 26 is bonded by resistance welding, ultrasonic bonding, heat welding or the like at the negative electrode tab bonding portion 25 described above when viewed in the stacking direction dL. As a result, the negative electrode tab 26 is electrically connected to each negative electrode current collector 21Y.

図１および図５に示すように、正極タブ１６は、第１方向ｄ１において外装体４０の内側からシール部４６を通って外側に延び出ており、積層型電池１の正極端子として機能する。同様に、負極タブ２６は、第１方向ｄ１において外装体４０の内側からシール部４６を通っての外側に延び出ており、積層型電池１の負極端子として機能する。正極タブ１６には、正極シーラント１８が設けられている。負極タブ２６には、負極シーラント２８が設けられている。正極タブ１６は、シーラント１８を介して外装体４０の第１基材４１および第２基材４２にヒートシールされる。また、負極タブ２６は、シーラント２８を介して外装体４０の第１基材４１および第２基材４２にヒートシールされる。このようにして、封止空間４５と外装体４０の外部とを連通するような隙間が各タブ１６，２６の周囲に形成されることを防止している。 As shown in FIGS. 1 and 5, the positive electrode tab 16 extends from the inside of the exterior body 40 to the outside through the seal portion 46 in the first direction d1, and functions as a positive electrode terminal of the laminated battery 1. Similarly, the negative electrode tab 26 extends from the inside of the exterior body 40 to the outside through the seal portion 46 in the first direction d1, and functions as a negative electrode terminal of the laminated battery 1. The positive electrode tab 16 is provided with a positive electrode sealant 18. The negative electrode tab 26 is provided with a negative electrode sealant 28. The positive electrode tab 16 is heat-sealed to the first base material 41 and the second base material 42 of the exterior body 40 via the sealant 18. Further, the negative electrode tab 26 is heat-sealed to the first base material 41 and the second base material 42 of the exterior body 40 via the sealant 28. In this way, it is prevented that a gap that communicates between the sealing space 45 and the outside of the exterior body 40 is formed around the tabs 16 and 26.

正極タブ１６は、アルミニウム等を用いて形成され得る。負極タブ２６は、ニッケル、ニッケルメッキ銅等を用いて形成され得る。シーラント１８，２８は、外装体４０の樹脂接着層４０ｂとタブ１６，２６とに溶着可能な材料から構成される。シーラント１８，２８の材料としては、ポリプロピレン、変性ポリプロピレン、低密度ポリプロピレン、アイオノマー、エチレン・酢酸ビニル等を挙げることができる。 The positive electrode tab 16 can be formed by using aluminum or the like. The negative electrode tab 26 can be formed using nickel, nickel-plated copper, or the like. The sealants 18 and 28 are made of a material that can be welded to the resin adhesive layer 40b of the exterior body 40 and the tabs 16 and 26. Examples of the materials of the sealants 18 and 28 include polypropylene, modified polypropylene, low-density polypropylene, ionomer, ethylene-vinyl acetate and the like.

［積層型電池の製造方法］
次に、リチウムイオン二次電池として構成された本実施の形態による積層型電池１の製造方法について説明する。以下に説明する積層型電池の製造方法は、複数の正極板１０Ｘおよび複数の負極板２０Ｙを積層方向ｄＬに交互に積層して電極積層体３を形成する積層工程と、電極積層体３の接続部１３，２３で各接続領域ａ１，ａ２を互いに固定して固定部１７ａ，１７ｂ，２７ａ，２７ｂを形成する固定工程と、を備える。また、積層型電池の製造方法は、接続部１３，２３にタブ１６，２６を接合するとともに、接続部１３，２３で各接続領域ａ１，ａ２を互いに接合して、膜電極接合体５を得る接合工程と、外装体４０内に膜電極接合体５を封止する封止工程と、を備える。以下、各工程について説明する。 [Manufacturing method of stacked batteries]
Next, a method of manufacturing the laminated battery 1 according to the present embodiment, which is configured as a lithium ion secondary battery, will be described. The method for manufacturing a laminated battery described below is a laminating step of alternately laminating a plurality of positive electrode plates 10X and a plurality of negative electrode plates 20Y in the laminating direction dL to form an electrode laminated body 3, and connecting the electrode laminated body 3. The portions 13 and 23 include a fixing step of fixing the connection regions a1 and a2 to each other to form the fixing portions 17a, 17b, 27a and 27b. Further, in the method for manufacturing a laminated battery, the tabs 16 and 26 are joined to the connecting portions 13 and 23, and the connecting regions a1 and a2 are joined to each other at the connecting portions 13 and 23 to obtain a membrane electrode assembly 5. It includes a joining step and a sealing step of sealing the membrane electrode assembly 5 inside the exterior body 40. Hereinafter, each step will be described.

（積層工程）
積層工程では、正極板１０Ｘおよび負極板２０Ｙを積層して電極積層体３を形成する。積層工程は、正極板１０Ｘおよび負極板２０Ｙをそれぞれ準備する工程と、正極板１０Ｘおよび負極板２０Ｙを交互に積層する工程と、を含んでいる。 (Laminating process)
In the laminating step, the positive electrode plate 10X and the negative electrode plate 20Y are laminated to form the electrode laminate 3. The laminating step includes a step of preparing the positive electrode plate 10X and the negative electrode plate 20Y, respectively, and a step of alternately laminating the positive electrode plate 10X and the negative electrode plate 20Y.

まず、正極板１０Ｘおよび負極板２０Ｙをそれぞれ準備する工程を実施する。この工程においては、正極板１０Ｘおよび負極板２０Ｙをそれぞれ作製する。まず、正極集電体１１Ｘを構成するようになる長尺のアルミニウム箔上に、正極活物質層１２Ｘを構成するようになる組成物（スラリー）を塗工し、続いて乾燥し、その後プレスして高密度化する。次に、所望の大きさに断裁し、枚葉状の正極板１０Ｘが作製され得る。同様に、負極集電体２１Ｙを構成するようになる長尺の銅箔上に、負極活物質層２２Ｙを構成するようになる組成物（スラリー）を塗工し、続いて乾燥し、その後プレスして高密度化する。次に、所望の大きさに断裁し、枚葉状の負極板２０Ｙが作製され得る。なお、正極板１０Ｘおよび負極板２０Ｙの少なくとも一方に機能層３０Ａをアルミナで形成して付与する場合には、例えば、電極板１０Ｘ，２０Ｙをなすようになる断裁前の長尺材上または断裁後の枚葉材上に、アルミナを含む材料を塗布して固化させることで機能層３０Ａが作製され得る。このようにして、正極板１０Ｘおよび負極板２０Ｙをそれぞれ得ることができる。 First, a step of preparing the positive electrode plate 10X and the negative electrode plate 20Y is carried out. In this step, a positive electrode plate 10X and a negative electrode plate 20Y are produced, respectively. First, a composition (slurry) that constitutes the positive electrode active material layer 12X is applied onto a long aluminum foil that constitutes the positive electrode current collector 11X, then dried, and then pressed. To increase the density. Next, it can be cut to a desired size to produce a single-wafer-shaped positive electrode plate 10X. Similarly, a composition (slurry) that constitutes the negative electrode active material layer 22Y is applied onto a long copper foil that constitutes the negative electrode current collector 21Y, subsequently dried, and then pressed. To increase the density. Next, it can be cut to a desired size to produce a single-wafer-shaped negative electrode plate 20Y. When the functional layer 30A is formed of alumina on at least one of the positive electrode plate 10X and the negative electrode plate 20Y and applied, for example, on a long material before cutting or after cutting so as to form the electrode plates 10X and 20Y. The functional layer 30A can be produced by applying a material containing alumina on the single-wafer material and solidifying it. In this way, the positive electrode plate 10X and the negative electrode plate 20Y can be obtained, respectively.

次に、正極板１０Ｘおよび負極板２０Ｙを交互に積層する工程を実施する。この工程においては、正極板１０Ｘの正極活物質層１２Ｘと負極板２０Ｙの負極活物質層２２Ｙとが正対するようにして、正極板１０Ｘと負極板２０Ｙとの間に絶縁シート３１を介在させながら、正極板１０Ｘおよび負極板２０Ｙを積層していく。積層方向ｄＬにおける最下部および最上部には、負極板２０Ｙが配置される。このように正極板１０Ｘおよび負極板２０Ｙを積層することにより、第１方向ｄ１における一側（図６における右側）で複数の正極接続領域ａ１が重ね合わされて正極接続部１３が形成される。また、第１方向ｄ１における他側（図６における左側）で複数の負極接続領域ａ２が重ね合わされて負極接続部２３が形成される。 Next, a step of alternately laminating the positive electrode plate 10X and the negative electrode plate 20Y is carried out. In this step, the positive electrode active material layer 12X of the positive electrode plate 10X and the negative electrode active material layer 22Y of the negative electrode plate 20Y face each other, and the insulating sheet 31 is interposed between the positive electrode plate 10X and the negative electrode plate 20Y. , Positive electrode plate 10X and negative electrode plate 20Y are laminated. The negative electrode plate 20Y is arranged at the lowermost portion and the uppermost portion in the stacking direction dL. By laminating the positive electrode plate 10X and the negative electrode plate 20Y in this way, a plurality of positive electrode connection regions a1 are overlapped on one side (right side in FIG. 6) in the first direction d1 to form the positive electrode connection portion 13. Further, a plurality of negative electrode connection regions a2 are overlapped on the other side (left side in FIG. 6) in the first direction d1 to form the negative electrode connection portion 23.

このようにして、図６に示すような、複数の正極板１０Ｘおよび複数の負極板２０Ｙが積層方向ｄＬに交互に積層された電極積層体３を得ることができる。 In this way, as shown in FIG. 6, it is possible to obtain an electrode laminate 3 in which a plurality of positive electrode plates 10X and a plurality of negative electrode plates 20Y are alternately laminated in the stacking direction dL.

（固定工程）
積層工程の後に、固定工程が行われる。固定工程では、電極積層体３の接続部１３，２３で各接続領域ａ１，ａ２を互いに固定して固定部１７ａ，１７ｂ，２７ａ，２７ｂする。固定工程は、正極接続部１３で各正極接続領域ａ１を互いに固定して正極固定部１７ａ，１７ｂを形成する工程と、負極接続部２３で各負極接続領域ａ２を互いに固定して負極固定部２７ａ，２７ｂする工程と、を含んでいる。 (Fixing process)
After the laminating step, a fixing step is performed. In the fixing step, the connection regions a1 and a2 are fixed to each other at the connection portions 13 and 23 of the electrode laminate 3 to form the fixing portions 17a, 17b, 27a and 27b. The fixing steps include a step of fixing the positive electrode connecting regions a1 to each other at the positive electrode connecting portion 13 to form the positive electrode fixing portions 17a and 17b, and fixing the negative electrode connecting regions a2 to each other at the negative electrode connecting portion 23 to fix the negative electrode fixing portions 27a. , 27b and.

まず、正極接続部１３で各正極接続領域ａ１を互いに固定して正極固定部１７ａ，１７ｂを形成する工程を実施する。この工程においては、積層方向ｄＬで見たときに、次の接合工程の際に正極タブ１６が接合される位置とは異なる位置、すなわち後述する正極タブ接合部１５が形成される位置とは異なる位置に、正極固定部１７ａ，１７ｂを形成する。まず、第２方向ｄ２において正極タブ接合部１５が形成される位置よりも一側（図７における上側）の位置に、正極固定部１７ａを形成する。より具体的には、図８に示すように、まず、当該位置において、正極接続部１３の第２面１３ｂが超音波接合機５０のアンビル５１の載置面を向くように、正極接続部１３をアンビル５１上に載置する。次に、その位置において、正極接続部１３の第１面１３ａを、超音波接合機５０のホーン５２により押圧する。この超音波接合機５０のホーン５２により、振動エネルギーが各正極板１０Ｘの正極接続領域ａ１に伝えられる。この振動エネルギーにより、その位置において各正極板１０Ｘが部分的に溶解し、各正極接続領域ａ１が互いに接合される。この各正極板１０Ｘが溶解し互いに接合された部分により、正極固定部１７ａが形成される。このように超音波接合機５０のホーン５２により押圧されることで、スポット状の正極固定部１７ａが形成される。同様にして、第２方向ｄ２において正極タブ接合部１５が形成される位置よりも他側（図７における下側）の位置にも、同様の正極固定部１７ｂを形成する。このような正極固定部１７ａ，１７ｂにより、各正極接続領域ａ１を互いに固定することができる。また、各正極集電体１１Ｘを互いに電気的に接続することができる。 First, a step of fixing the positive electrode connecting regions a1 to each other at the positive electrode connecting portion 13 to form the positive electrode fixing portions 17a and 17b is performed. In this step, when viewed in the stacking direction dL, the position is different from the position where the positive electrode tab 16 is joined in the next joining step, that is, the position where the positive electrode tab joint portion 15 described later is formed. Positive electrode fixing portions 17a and 17b are formed at the positions. First, the positive electrode fixing portion 17a is formed at a position on one side (upper side in FIG. 7) of the position where the positive electrode tab joint portion 15 is formed in the second direction d2. More specifically, as shown in FIG. 8, first, at that position, the positive electrode connecting portion 13 so that the second surface 13b of the positive electrode connecting portion 13 faces the mounting surface of the anvil 51 of the ultrasonic bonding machine 50. Is placed on the anvil 51. Next, at that position, the first surface 13a of the positive electrode connecting portion 13 is pressed by the horn 52 of the ultrasonic bonding machine 50. Vibration energy is transmitted to the positive electrode connection region a1 of each positive electrode plate 10X by the horn 52 of the ultrasonic bonding machine 50. Due to this vibration energy, the positive electrode plates 10X are partially melted at that position, and the positive electrode connection regions a1 are joined to each other. The positive electrode fixing portion 17a is formed by the portions where the positive electrode plates 10X are melted and joined to each other. By being pressed by the horn 52 of the ultrasonic bonding machine 50 in this way, a spot-shaped positive electrode fixing portion 17a is formed. Similarly, a similar positive electrode fixing portion 17b is formed at a position on the other side (lower side in FIG. 7) than the position where the positive electrode tab joint portion 15 is formed in the second direction d2. With such positive electrode fixing portions 17a and 17b, the positive electrode connection regions a1 can be fixed to each other. Further, the positive electrode current collectors 11X can be electrically connected to each other.

また同様に、負極接続部２３で各負極接続領域ａ２を互いに固定して負極固定部２７ａ，２７ｂする工程を実施する。この工程においては、積層方向ｄＬで見たときに、次の接合工程の際に負極タブ２６が接合される位置とは異なる位置、すなわち後述する負極タブ接合部２５が形成される位置とは異なる位置に、負極固定部２７ａ，２７ｂを形成する。まず、第２方向ｄ２において負極タブ接合部２５が形成される位置よりも一側（図７における上側）の位置に、負極固定部２７ａを形成する。より具体的には、図８に示すように、まず、当該位置において、負極接続部２３の第２面２３ｂが超音波接合機５０のアンビル５１の載置面を向くように、負極接続部２３をアンビル５１上に載置する。次に、その位置において、負極接続部２３の第１面２３ａを、超音波接合機５０のホーン５２により押圧する。この超音波接合機５０のホーン５２により、振動エネルギーが各負極板２０Ｙの負極接続領域ａ２に伝えられる。この振動エネルギーにより、その位置において各負極板２０Ｙが部分的に溶解し、各負極接続領域ａ２が互いに接合される。この各負極板２０Ｙが溶解し互いに接合された部分により、負極固定部２７ａが形成される。このように超音波接合機５０のホーン５２により押圧されることで、スポット状の負極固定部２７ａが形成される。同様にして、第２方向ｄ２において負極タブ接合部２５が形成される位置よりも他側（図７における下側）の位置にも、同様の負極固定部２７ｂを形成する。このような負極固定部２７ａ，２７ｂにより、各負極接続領域ａ２を互いに固定することができる。また、各負極集電体２１Ｙを互いに電気的に接続することができる。 Similarly, the steps of fixing the negative electrode connecting regions a2 to each other at the negative electrode connecting portion 23 and forming the negative electrode fixing portions 27a and 27b are carried out. In this step, when viewed in the stacking direction dL, the position is different from the position where the negative electrode tab 26 is joined in the next joining step, that is, the position where the negative electrode tab joint 25 described later is formed. Negative electrode fixing portions 27a and 27b are formed at the positions. First, the negative electrode fixing portion 27a is formed at a position on one side (upper side in FIG. 7) of the position where the negative electrode tab joint portion 25 is formed in the second direction d2. More specifically, as shown in FIG. 8, first, at that position, the negative electrode connecting portion 23 so that the second surface 23b of the negative electrode connecting portion 23 faces the mounting surface of the anvil 51 of the ultrasonic bonding machine 50. Is placed on the anvil 51. Next, at that position, the first surface 23a of the negative electrode connecting portion 23 is pressed by the horn 52 of the ultrasonic bonding machine 50. Vibration energy is transmitted to the negative electrode connection region a2 of each negative electrode plate 20Y by the horn 52 of the ultrasonic bonding machine 50. Due to this vibration energy, the negative electrode plates 20Y are partially melted at that position, and the negative electrode connection regions a2 are joined to each other. The negative electrode fixing portion 27a is formed by the portions where the negative electrode plates 20Y are melted and joined to each other. By being pressed by the horn 52 of the ultrasonic bonding machine 50 in this way, a spot-shaped negative electrode fixing portion 27a is formed. Similarly, a similar negative electrode fixing portion 27b is formed at a position on the other side (lower side in FIG. 7) than the position where the negative electrode tab joint portion 25 is formed in the second direction d2. The negative electrode connecting regions a2 can be fixed to each other by such negative electrode fixing portions 27a and 27b. Further, the negative electrode current collectors 21Y can be electrically connected to each other.

このようにして、図７に示すように、電極積層体３の接続部１３，２３において各接続領域ａ１，ａ２が互いに固定される。 In this way, as shown in FIG. 7, the connection regions a1 and a2 are fixed to each other at the connection portions 13 and 23 of the electrode laminate 3.

なお、上述した正極固定部１７ａ，１７ｂおよび負極固定部２７ａ，２７ｂは、一の超音波接合機５０により順次形成されてもよい。 The positive electrode fixing portions 17a and 17b and the negative electrode fixing portions 27a and 27b described above may be sequentially formed by one ultrasonic bonding machine 50.

（接合工程）
固定工程の後に、接合工程が行われる。接合工程では、電極積層体３の接続部１３，２３にタブ１６，２６を接合する。接合工程は、正極タブ１６および負極タブ２６をそれぞれ準備する工程と、正極接続部１３に正極タブ１６を接合する工程と、負極接続部２３に負極タブ２６を接合する工程と、を含んでいる。 (Joining process)
After the fixing step, a joining step is performed. In the joining step, the tabs 16 and 26 are joined to the connecting portions 13 and 23 of the electrode laminate 3. The joining step includes a step of preparing the positive electrode tab 16 and the negative electrode tab 26, a step of joining the positive electrode tab 16 to the positive electrode connecting portion 13, and a step of joining the negative electrode tab 26 to the negative electrode connecting portion 23. ..

まず、正極タブ１６および負極タブ２６をそれぞれ準備する工程を実施する。この工程においては、アルミニウム金属で形成された正極タブ１６であって、正極シーラント１８が取り付けられた正極タブ１６を準備する。正極シーラント１８は、第１方向ｄ１において正極タブ１６の一部を覆うように取り付けられ、第２方向ｄ２において正極タブ１６の両側に延び出るように取り付けられている。また、銅金属で形成された負極タブ２６であって、負極シーラント２８が取り付けられた負極タブ２６を準備する。負極シーラント２８は、第１方向ｄ１において負極タブ２６の一部を覆うように取り付けられ、第２方向ｄ２において負極タブ２６の両側に延び出るように取り付けられている。 First, a step of preparing the positive electrode tab 16 and the negative electrode tab 26 is carried out. In this step, a positive electrode tab 16 made of aluminum metal and to which a positive electrode sealant 18 is attached is prepared. The positive electrode sealant 18 is attached so as to cover a part of the positive electrode tab 16 in the first direction d1, and is attached so as to extend to both sides of the positive electrode tab 16 in the second direction d2. Further, a negative electrode tab 26 formed of copper metal and to which a negative electrode sealant 28 is attached is prepared. The negative electrode sealant 28 is attached so as to cover a part of the negative electrode tab 26 in the first direction d1, and is attached so as to extend to both sides of the negative electrode tab 26 in the second direction d2.

次に、正極接続部１３に正極タブ１６を接合する工程を実施する。この工程においては、正極タブ接合部１５を形成して、正極接続部１３に正極タブ１６を接合する。まず、準備した正極タブ１６を、正極タブ１６の下面が超音波接合機５０のアンビル５１の載置面を向くように、アンビル５１上に載置する。続いて、図９および図１０に示すように、正極タブ１６の上面と正極接続部１３の第２面１３ｂとが部分的に重なるように、電極積層体３を正極タブ１６上に載置する。この際、第２方向ｄ２における正極接続領域ａ１の中心位置と正極タブ１６の中心位置とが一致するように、正極タブ１６に対する電極積層体３の位置合わせを行う。次に、その位置において、正極接続部１３の第１面１３ａを、超音波接合機５０のホーン５２により押圧する。この超音波接合機５０のホーン５２により、振動エネルギーが各正極板１０Ｘの正極接続領域ａ１および正極タブ１６に伝えられる。この振動エネルギーにより、その位置において各正極板１０Ｘおよび正極タブ１６が部分的に溶解し、正極タブ１６と正極接続領域ａ１とが互いに接合されるとともに、正極接続領域ａ１の各々が互いに接合される。このようにして、正極タブ接合部１５が形成される。この正極タブ接合部１５により、正極タブ１６が各正極集電体１１Ｘと電気的に接続される。 Next, a step of joining the positive electrode tab 16 to the positive electrode connecting portion 13 is performed. In this step, the positive electrode tab joint portion 15 is formed, and the positive electrode tab 16 is joined to the positive electrode connection portion 13. First, the prepared positive electrode tab 16 is placed on the anvil 51 so that the lower surface of the positive electrode tab 16 faces the mounting surface of the anvil 51 of the ultrasonic bonding machine 50. Subsequently, as shown in FIGS. 9 and 10, the electrode laminate 3 is placed on the positive electrode tab 16 so that the upper surface of the positive electrode tab 16 and the second surface 13b of the positive electrode connecting portion 13 partially overlap. .. At this time, the electrode laminate 3 is aligned with the positive electrode tab 16 so that the center position of the positive electrode connection region a1 in the second direction d2 and the center position of the positive electrode tab 16 coincide with each other. Next, at that position, the first surface 13a of the positive electrode connecting portion 13 is pressed by the horn 52 of the ultrasonic bonding machine 50. Vibration energy is transmitted to the positive electrode connection region a1 and the positive electrode tab 16 of each positive electrode plate 10X by the horn 52 of the ultrasonic bonding machine 50. Due to this vibration energy, each positive electrode plate 10X and the positive electrode tab 16 are partially melted at that position, the positive electrode tab 16 and the positive electrode connection region a1 are joined to each other, and each of the positive electrode connection regions a1 is joined to each other. .. In this way, the positive electrode tab joint portion 15 is formed. The positive electrode tab 16 is electrically connected to each positive electrode current collector 11X by the positive electrode tab joint portion 15.

また同様に、負極接続部２３に負極タブ２６を接合する工程を実施する。この工程においては、負極タブ接合部２５を形成して、負極接続部２３に負極タブ２６を接合する。まず、準備した負極タブ２６を、負極タブ２６の下面が超音波接合機５０のアンビル５１の載置面を向くように、アンビル５１上に載置する。続いて、図９および図１０に示すように、負極タブ２６の上面と負極接続部２３の第２面２３ｂとが部分的に重なるように、電極積層体３を負極タブ２６上に載置する。この際、第２方向ｄ２における負極接続領域ａ２の中心位置と負極タブ２６の中心位置とが一致するように、負極タブ２６に対する電極積層体３の位置合わせを行う。次に、その位置において、負極接続部２３の第１面２３ａを、超音波接合機５０のホーン５２により押圧する。この超音波接合機５０のホーン５２により、振動エネルギーが各負極板２０Ｙの負極接続領域ａ２および負極タブ２６に伝えられる。この振動エネルギーにより、その位置において各負極板２０Ｙおよび負極タブ２６が部分的に溶融し、負極タブ２６と負極接続領域ａ２とが互いに接合されるとともに、負極接続領域ａ２の各々が互いに接合される。このようにして、負極タブ接合部２５が形成される。この負極タブ接合部２５により、負極タブ２６が各負極集電体２１Ｙと電気的に接続される。 Similarly, the step of joining the negative electrode tab 26 to the negative electrode connecting portion 23 is carried out. In this step, the negative electrode tab joint portion 25 is formed, and the negative electrode tab 26 is joined to the negative electrode connection portion 23. First, the prepared negative electrode tab 26 is placed on the anvil 51 so that the lower surface of the negative electrode tab 26 faces the mounting surface of the anvil 51 of the ultrasonic bonding machine 50. Subsequently, as shown in FIGS. 9 and 10, the electrode laminate 3 is placed on the negative electrode tab 26 so that the upper surface of the negative electrode tab 26 and the second surface 23b of the negative electrode connecting portion 23 partially overlap. .. At this time, the electrode laminate 3 is aligned with the negative electrode tab 26 so that the center position of the negative electrode connection region a2 in the second direction d2 and the center position of the negative electrode tab 26 coincide with each other. Next, at that position, the first surface 23a of the negative electrode connecting portion 23 is pressed by the horn 52 of the ultrasonic bonding machine 50. Vibration energy is transmitted to the negative electrode connection region a2 and the negative electrode tab 26 of each negative electrode plate 20Y by the horn 52 of the ultrasonic bonding machine 50. Due to this vibration energy, each negative electrode plate 20Y and the negative electrode tab 26 are partially melted at that position, the negative electrode tab 26 and the negative electrode connection region a2 are joined to each other, and each of the negative electrode connection regions a2 is joined to each other. .. In this way, the negative electrode tab joint portion 25 is formed. The negative electrode tab 26 is electrically connected to each negative electrode current collector 21Y by the negative electrode tab joint portion 25.

ここで、上述した接続部１３，２３にタブ１６，２６を接合する工程において、タブ１６，２６を取り付けるために、電極積層体３を移動させることがある。電極積層体３は正極板１０Ｘおよび負極板２０Ｙが交互に積層して構成されているため、各接続領域ａ１，ａ２が固定されていない場合、その移動時に正極板１０Ｘおよび負極板２０Ｙが互いに位置ずれを起こすことが考えられる。しかしながら、本実施の形態においては、正極接続部１３には、正極接続領域ａ１の各々が互いに固定された正極固定部１７ａ，１７ｂが形成されているとともに、負極接続部２３には、負極接続領域ａ２の各々が互いに固定された負極固定部２７ａ，２７ｂが形成されている。このため、電極積層体３の移動時に、正極板１０Ｘおよび負極板２０Ｙが位置ずれを起こすことを防止することができる。 Here, in the step of joining the tabs 16 and 26 to the connection portions 13 and 23 described above, the electrode laminate 3 may be moved in order to attach the tabs 16 and 26. Since the electrode laminate 3 is configured by alternately laminating the positive electrode plates 10X and the negative electrode plates 20Y, when the connection regions a1 and a2 are not fixed, the positive electrode plates 10X and the negative electrode plates 20Y are positioned at each other during their movement. It is possible that a gap will occur. However, in the present embodiment, the positive electrode connecting portion 13 is formed with the positive electrode fixing portions 17a and 17b in which the positive electrode connecting regions a1 are fixed to each other, and the negative electrode connecting portion 23 is formed with the negative electrode connecting region. Negative electrode fixing portions 27a and 27b in which each of a2 is fixed to each other are formed. Therefore, it is possible to prevent the positive electrode plate 10X and the negative electrode plate 20Y from being displaced when the electrode laminate 3 is moved.

このようにして、図９に示すような、接続部１３，２３にタブ１６，２６が接合されるとともに、接続部１３，２３で各接続領域ａ１，ａ２が互いに接合された膜電極接合体５を得ることができる。 In this way, as shown in FIG. 9, the membrane electrode assembly 5 in which the tabs 16 and 26 are joined to the connecting portions 13 and 23 and the connection regions a1 and a2 are joined to each other in the connecting portions 13 and 23. Can be obtained.

なお、上述した正極タブ接合部１５および負極タブ接合部２５は、一の超音波接合機５０により順次形成されてもよい。また、正極タブ接合部１５および負極タブ接合部２５は、上述した正極固定部１７ａ，１７ｂおよび負極固定部２７ａ，２７ｂを形成した超音波接合機５０で形成されてもよい。 The positive electrode tab bonding portion 15 and the negative electrode tab bonding portion 25 described above may be sequentially formed by one ultrasonic bonding machine 50. Further, the positive electrode tab bonding portion 15 and the negative electrode tab bonding portion 25 may be formed by an ultrasonic bonding machine 50 in which the positive electrode fixing portions 17a and 17b and the negative electrode fixing portions 27a and 27b described above are formed.

（封止工程）
接合工程の後に、封止工程が行われる。封止工程では、外装体４０内に膜電極接合体５を封止する。封止工程は、第１基材４１および第２基材４２をそれぞれ準備する工程と、第１基材４１および第２基材４２の間に膜電極接合体５を封止する工程と、を含んでいる。 (Seal process)
After the joining step, a sealing step is performed. In the sealing step, the membrane electrode assembly 5 is sealed in the exterior body 40. The sealing step includes a step of preparing the first base material 41 and the second base material 42, respectively, and a step of sealing the membrane electrode assembly 5 between the first base material 41 and the second base material 42. Includes.

まず、第１基材４１および第２基材４２をそれぞれ準備する工程を実施する。この工程においては、第１基材４１および第２基材４２をそれぞれ製造する。まず、金属層４０ａを構成するアルミニウム箔の一側に、樹脂接着層４０ｂを構成するようになる樹脂材料の組成物を塗工して固化する。次に、所望の大きさに断裁し、平板状の第１基材４１が得られる。その後、平板状の第１基材４１に対して、絞り加工を行い、膨出部４４を形成する。これにより、膨出部４４を有する第１基材４１が得られる。また、金属層４０ａを構成するアルミニウム箔の一側に、樹脂接着層４０ｂを構成するようになる樹脂材料の組成物を塗工して固化する。次に、所望の大きさに断裁し、平板状の第２基材４２が得られる。このようにして、膜電極接合体５を封止する外装体４０を構成する第１基材４１および第２基材４２を得ることができる。 First, a step of preparing the first base material 41 and the second base material 42 is carried out. In this step, the first base material 41 and the second base material 42 are manufactured, respectively. First, a composition of a resin material that constitutes the resin adhesive layer 40b is applied to one side of the aluminum foil that constitutes the metal layer 40a and solidified. Next, it is cut to a desired size to obtain a flat plate-shaped first base material 41. After that, the flat plate-shaped first base material 41 is drawn to form a bulging portion 44. As a result, the first base material 41 having the bulging portion 44 is obtained. Further, a composition of a resin material that constitutes the resin adhesive layer 40b is applied and solidified on one side of the aluminum foil that constitutes the metal layer 40a. Next, it is cut to a desired size to obtain a flat plate-shaped second base material 42. In this way, the first base material 41 and the second base material 42 constituting the exterior body 40 that seals the membrane electrode assembly 5 can be obtained.

次に、第１基材４１および第２基材４２の間に膜電極接合体５を封止する工程を実施する。この工程においては、まず、樹脂接着層４０ｂが上を向くように、第２基材４２をステージ上に載置する。続いて、第２基材４２上に膜電極接合体５を載置する。次に、膜電極接合体５の上から、膜電極接合体５が膨出部４４内に収容されるように、第１基材４１を被せる。ここで、第１基材４１の樹脂接着層４０ｂが第２基材４２の樹脂接着層４０ｂに対向するように、第１基材４１を被せる。この際、タブ１６，２６が外部に延び出た状態で、膜電極接合体５が第１基材４１と第２基材４２との間に配置される。また、この際、外装体４０とタブ１６，２６との間に、シーラント１８，２８が配置される。 Next, a step of sealing the membrane electrode assembly 5 between the first base material 41 and the second base material 42 is carried out. In this step, first, the second base material 42 is placed on the stage so that the resin adhesive layer 40b faces upward. Subsequently, the membrane electrode assembly 5 is placed on the second base material 42. Next, the first base material 41 is covered over the membrane electrode assembly 5 so that the membrane electrode assembly 5 is housed in the bulge 44. Here, the first base material 41 is covered so that the resin adhesive layer 40b of the first base material 41 faces the resin adhesive layer 40b of the second base material 42. At this time, the membrane electrode assembly 5 is arranged between the first base material 41 and the second base material 42 with the tabs 16 and 26 extending to the outside. At this time, the sealants 18 and 28 are arranged between the exterior body 40 and the tabs 16 and 26.

その後、膜電極接合体５の周囲において、第１基材４１と第２基材４２とを、例えば１５０℃〜２００℃の温度を有する金属製のヒートバーにより押圧する。これにより、ヒートバーにより押圧された領域の近傍において、第１基材４１と第２基材４２の各々の内面に形成された樹脂接着層４０ｂが溶解し、それらが互いにヒートシール（熱溶着）して、シール部４６が形成される。 Then, around the membrane electrode assembly 5, the first base material 41 and the second base material 42 are pressed by, for example, a metal heat bar having a temperature of 150 ° C. to 200 ° C. As a result, the resin adhesive layers 40b formed on the inner surfaces of the first base material 41 and the second base material 42 are melted in the vicinity of the region pressed by the heat bar, and they are heat-sealed (heat welded) with each other. The seal portion 46 is formed.

より具体的には、まず、第２方向ｄ２における外装体４０の一側の縁部（図１における下側）、第１方向ｄ１における外装体４０の一側の縁部（正極タブ１６の側、図１における右側）および第１方向ｄ１における外装体４０の他側の縁部（負極タブ２６の側、図１における左側）を、ヒートバーにより押圧する。これにより、ヒートバーにより押圧された領域の近傍において、第１基材４１と第２基材４２の各々の内面に形成された樹脂接着層４０ｂが溶解し、それらが互いにヒートシール（熱溶着）される。ヒートシールの際、タブ１６，２６の周囲においては、シーラント１８，２８が第１基材４１および第２基材４２の樹脂接着層４０ｂとともに溶解する。このため、第１基材４１とタブ１６，２６とがヒートシールされるとともに、第２基材４２とタブ１６，２６とがヒートシールされる。これにより、タブ１６，２６の周囲に、封止空間４５と外装体４０の外部とを連通するような隙間が形成されることを防止することができる。このようにヒートシールされることにより、第２方向ｄ２における外装体４０の他側の縁部（図１における上側）に開口部が形成される。 More specifically, first, one edge of the exterior body 40 in the second direction d2 (lower side in FIG. 1) and one edge of the exterior body 40 in the first direction d1 (side of the positive electrode tab 16). , The right side in FIG. 1) and the other edge of the exterior body 40 in the first direction d1 (the side of the negative electrode tab 26, the left side in FIG. 1) are pressed by the heat bar. As a result, the resin adhesive layers 40b formed on the inner surfaces of the first base material 41 and the second base material 42 are melted in the vicinity of the region pressed by the heat bar, and they are heat-sealed (heat welded) with each other. To. During heat sealing, the sealants 18 and 28 melt together with the resin adhesive layer 40b of the first base material 41 and the second base material 42 around the tabs 16 and 26. Therefore, the first base material 41 and the tabs 16 and 26 are heat-sealed, and the second base material 42 and the tabs 16 and 26 are heat-sealed. As a result, it is possible to prevent the formation of a gap around the tabs 16 and 26 so as to communicate the sealing space 45 with the outside of the exterior body 40. By heat-sealing in this way, an opening is formed at the other side edge portion (upper side in FIG. 1) of the exterior body 40 in the second direction d2.

次に、この開口部から外装体４０内に電解液を注入する。これにより、外装体４０内が電解液で充填される。 Next, the electrolytic solution is injected into the exterior body 40 through this opening. As a result, the inside of the exterior body 40 is filled with the electrolytic solution.

その後、第２方向ｄ２において外装体４０の他側の縁部（図１における上側）を、ヒートバーにより押圧する。これにより、外装体４０の第２方向ｄ２における他側の縁部がヒートシールされ、開口部が塞がれる。このため、図１に示すように、膜電極接合体５の周囲で全周にわたってシール部４６が連続状に形成され、枠状のシール部４６によって封止空間４５内の膜電極接合体５が電解液とともに外装体４０内に封止される。なお、このヒートシールは図示しない減圧チャンバ内で行われ、封止空間４５が減圧されながら封止される。 Then, in the second direction d2, the other edge portion (upper side in FIG. 1) of the exterior body 40 is pressed by the heat bar. As a result, the other side edge portion of the exterior body 40 in the second direction d2 is heat-sealed, and the opening portion is closed. Therefore, as shown in FIG. 1, the sealing portion 46 is continuously formed around the entire circumference of the membrane electrode assembly 5, and the frame-shaped sealing portion 46 allows the membrane electrode assembly 5 in the sealing space 45 to be formed. It is sealed in the exterior body 40 together with the electrolytic solution. This heat seal is performed in a pressure reducing chamber (not shown), and the sealing space 45 is sealed while being reduced in pressure.

このように、タブ１６，２６が外装体４０の外側に延び出た状態で、外装体４０の周縁部でシール部４６が形成されることにより、外装体４０内の封止空間４５に膜電極接合体５が封止される。 In this way, with the tabs 16 and 26 extending to the outside of the exterior body 40, the sealing portion 46 is formed at the peripheral edge of the exterior body 40, so that the film electrode is formed in the sealing space 45 inside the exterior body 40. The assembly 5 is sealed.

このようにして、図１に示すような、外装体４０内に膜電極接合体５が封止された積層型電池１を得ることができる。 In this way, as shown in FIG. 1, a laminated battery 1 in which the membrane electrode assembly 5 is sealed in the exterior body 40 can be obtained.

このように本実施の形態によれば、正極接続部１３は、積層方向ｄＬで見たときに正極タブ１６とは異なる位置に設けられた正極固定部１７ａ，１７ｂであって、正極接続領域ａ１の各々が互いに固定された正極固定部１７ａ，１７ｂを含んでいる。このことにより、正極タブ１６が正極接続部１３に接合される位置とは異なる位置で、各正極板１０Ｘの正極接続領域ａ１を互いに固定することができる。このため、電極板１０Ｘ，２０Ｙを積層してから正極タブ１６を接合するまでの間に、正極板１０Ｘが位置ずれを起こすことを防止することができる。とりわけ、電極板１０Ｘ，２０Ｙを積層してから正極タブ１６を接合するまでの間に、電極積層体３を移動させたとしても、正極板１０Ｘが位置ずれを起こすことを防止することができる。 As described above, according to the present embodiment, the positive electrode connecting portions 13 are the positive electrode fixing portions 17a and 17b provided at positions different from the positive electrode tabs 16 when viewed in the stacking direction dL, and the positive electrode connecting portions a1. Each of the positive electrode fixing portions 17a and 17b are fixed to each other. As a result, the positive electrode connection regions a1 of the positive electrode plates 10X can be fixed to each other at a position different from the position where the positive electrode tab 16 is joined to the positive electrode connection portion 13. Therefore, it is possible to prevent the positive electrode plate 10X from being displaced between the time when the electrode plates 10X and 20Y are laminated and the time when the positive electrode tabs 16 are joined. In particular, even if the electrode laminate 3 is moved between the time when the electrode plates 10X and 20Y are laminated and the time when the positive electrode tab 16 is joined, it is possible to prevent the positive electrode plate 10X from being displaced.

また、本実施の形態によれば、積層型電池１の製造時において、膜電極接合体５にテープを貼り付けることを不要にすることができる。このため、反応ムラの発生を防止することができ、積層型電池１の性能低下を抑制することができる。 Further, according to the present embodiment, it is possible to eliminate the need to attach the tape to the membrane electrode assembly 5 at the time of manufacturing the laminated battery 1. Therefore, it is possible to prevent the occurrence of reaction unevenness and suppress the deterioration of the performance of the laminated battery 1.

また、本実施の形態によれば、正極固定部１７ａ，１７ｂは、積層方向ｄＬで見たときに第２方向ｄ２において正極タブ１６の両側に設けられている。このように第２方向ｄ２における正極タブ１６の両側で各正極接続領域ａ１を固定することにより、正極板１０Ｘの第１方向ｄ１および第２方向ｄ２への位置ずれを防止するとともに、正極板１０Ｘの平面内における回転方向への位置ずれも効果的に防止することができる。このため、正極板１０Ｘの位置ずれをより一層防止することができる。 Further, according to the present embodiment, the positive electrode fixing portions 17a and 17b are provided on both sides of the positive electrode tab 16 in the second direction d2 when viewed in the stacking direction dL. By fixing each positive electrode connection region a1 on both sides of the positive electrode tab 16 in the second direction d2 in this way, it is possible to prevent the positive electrode plate 10X from being displaced in the first direction d1 and the second direction d2, and to prevent the positive electrode plate 10X from being displaced. It is also possible to effectively prevent the displacement of the above in the plane of rotation in the rotation direction. Therefore, the misalignment of the positive electrode plate 10X can be further prevented.

また、本実施の形態によれば、正極固定部１７ａ，１７ｂは、積層方向ｄＬで見たときに正極タブ１６から離間している。このことにより、積層型電池１の製造時において、正極タブ１６を接合する際に、正極タブ１６に正極固定部１７ａ，１７ｂが重なることを回避することができる。このため、正極タブ１６の接合を容易化することができ、積層型電池１の製造効率の低下を抑制することができる。 Further, according to the present embodiment, the positive electrode fixing portions 17a and 17b are separated from the positive electrode tab 16 when viewed in the stacking direction dL. This makes it possible to prevent the positive electrode fixing portions 17a and 17b from overlapping the positive electrode tab 16 when the positive electrode tab 16 is joined during the manufacture of the laminated battery 1. Therefore, it is possible to facilitate the joining of the positive electrode tabs 16 and suppress a decrease in the manufacturing efficiency of the laminated battery 1.

また、本実施の形態によれば、正極固定部１７ａ，１７ｂは、スポット状に形成されている。このことにより、正極固定部１７ａ，１７ｂを正極接続部１３上に局所的に形成することができる。このため、各正極接続領域ａ１の固定に要する時間を短縮することができ、積層型電池１の製造工数の増大を抑制することができる。 Further, according to the present embodiment, the positive electrode fixing portions 17a and 17b are formed in a spot shape. As a result, the positive electrode fixing portions 17a and 17b can be locally formed on the positive electrode connecting portion 13. Therefore, the time required for fixing each positive electrode connection region a1 can be shortened, and an increase in man-hours for manufacturing the laminated battery 1 can be suppressed.

また、本実施の形態によれば、負極接続部２３は、積層方向ｄＬで見たときに負極タブ２６とは異なる位置に設けられた負極固定部２７ａ，２７ｂであって、負極接続領域ａ２の各々が互いに固定された負極固定部２７ａ，２７ｂを含んでいる。このことにより、負極タブ２６が負極接続部２３に接合される位置とは異なる位置で、各負極板２０Ｙの負極接続領域ａ２を互いに固定することができる。このため、電極板１０Ｘ，２０Ｙを積層してから負極タブ２６を接合するまでの間に、負極板２０Ｙが位置ずれを起こすことを防止することができる。とりわけ、電極板１０Ｘ，２０Ｙを積層してから負極タブ２６を接合するまでの間に、電極積層体３を移動させたとしても、負極板２０Ｙが位置ずれを起こすことを防止することができる。 Further, according to the present embodiment, the negative electrode connecting portion 23 is a negative electrode fixing portion 27a, 27b provided at a position different from the negative electrode tab 26 when viewed in the stacking direction dL, and is a negative electrode connecting region a2. Each includes negative electrode fixing portions 27a and 27b fixed to each other. As a result, the negative electrode connection regions a2 of the negative electrode plates 20Y can be fixed to each other at a position different from the position where the negative electrode tab 26 is joined to the negative electrode connection portion 23. Therefore, it is possible to prevent the negative electrode plate 20Y from being displaced between the time when the electrode plates 10X and 20Y are laminated and the time when the negative electrode tab 26 is joined. In particular, even if the electrode laminate 3 is moved between the time when the electrode plates 10X and 20Y are laminated and the time when the negative electrode tab 26 is joined, it is possible to prevent the negative electrode plate 20Y from being displaced.

また、本実施の形態によれば、負極固定部２７ａ，２７ｂは、積層方向ｄＬで見たときに第２方向ｄ２において負極タブ２６の両側に設けられている。このように第２方向ｄ２における負極タブ２６の両側で各負極接続領域ａ２を固定することにより、負極板２０Ｙの第１方向ｄ１および第２方向ｄ２への位置ずれを防止するとともに、負極板２０Ｙの平面内における回転方向への位置ずれも効果的に防止することができる。このため、負極板２０Ｙの位置ずれをより一層防止することができる。 Further, according to the present embodiment, the negative electrode fixing portions 27a and 27b are provided on both sides of the negative electrode tab 26 in the second direction d2 when viewed in the stacking direction dL. By fixing the negative electrode connection regions a2 on both sides of the negative electrode tab 26 in the second direction d2 in this way, the negative electrode plate 20Y can be prevented from being displaced in the first direction d1 and the second direction d2, and the negative electrode plate 20Y can be prevented from being displaced. It is also possible to effectively prevent the displacement of the above in the plane of rotation in the rotation direction. Therefore, the misalignment of the negative electrode plate 20Y can be further prevented.

また、本実施の形態によれば、負極固定部２７ａ，２７ｂは、積層方向ｄＬで見たときに負極タブ２６から離間している。このことにより、積層型電池１の製造時において、負極タブ２６を接合する際に、負極タブ２６に負極固定部２７ａ，２７ｂが重なることを回避することができる。このため、負極タブ２６の接合を容易化することができ、積層型電池１の製造効率の低下を抑制することができる。 Further, according to the present embodiment, the negative electrode fixing portions 27a and 27b are separated from the negative electrode tab 26 when viewed in the stacking direction dL. This makes it possible to prevent the negative electrode fixing portions 27a and 27b from overlapping the negative electrode tab 26 when the negative electrode tab 26 is joined during the manufacture of the laminated battery 1. Therefore, it is possible to facilitate the joining of the negative electrode tabs 26, and it is possible to suppress a decrease in the manufacturing efficiency of the laminated battery 1.

また、本実施の形態によれば、負極固定部２７ａ，２７ｂは、スポット状に形成されている。このことにより、負極固定部２７ａ，２７ｂを負極接続部２３上に局所的に形成することができる。このため、各負極接続領域ａ１の固定に要する時間を短縮することができ、積層型電池１の製造工数の増大を抑制することができる。 Further, according to the present embodiment, the negative electrode fixing portions 27a and 27b are formed in a spot shape. As a result, the negative electrode fixing portions 27a and 27b can be locally formed on the negative electrode connecting portion 23. Therefore, the time required for fixing each negative electrode connection region a1 can be shortened, and an increase in man-hours for manufacturing the laminated battery 1 can be suppressed.

また、本実施の形態によれば、積層方向ｄＬで見たときの電極板１０Ｘ，２０Ｙの面積は、２０，０００ｍｍ２以上である。一般に、このように電極板１０Ｘ，２０Ｙの面積が大きい場合に、電極板１０Ｘ，２０Ｙの位置ずれが問題になりやすい。例えば、電極板１０Ｘ，２０Ｙ間の位置ずれによる正極板１０Ｘと負極板２０Ｙとの接触が起きやすくなり、短絡が発生するおそれがある。このため、電極板１０Ｘ，２０Ｙの位置ずれを防止するために、電極板１０Ｘ，２０Ｙの積層速度を低下させることがあり、積層型電池１の製造工数を増大させるおそれがある。これに対して本実施の形態によれば、このような大きな面積を有する電極板１０Ｘ,２０Ｙであっても、各電極板１０Ｘ，２０Ｙの接続領域ａ１，ａ２を互いに固定することができる。このため、電極板１０Ｘ,２０Ｙが位置ずれを起こすことを防止することができる。この結果、正極板１０Ｘと負極板２０Ｙとが短絡することを防止することができるとともに、積層型電池１の製造工数の増大を抑制することができる。 Further, according to the present embodiment, the area of the electrode plates 10X and 20Y when viewed in the stacking direction dL is 20,000 mm 2 or more. Generally, when the areas of the electrode plates 10X and 20Y are large in this way, the misalignment of the electrode plates 10X and 20Y tends to be a problem. For example, contact between the positive electrode plate 10X and the negative electrode plate 20Y is likely to occur due to a misalignment between the electrode plates 10X and 20Y, and a short circuit may occur. Therefore, in order to prevent the displacement of the electrode plates 10X and 20Y, the stacking speed of the electrode plates 10X and 20Y may be lowered, which may increase the man-hours for manufacturing the laminated battery 1. On the other hand, according to the present embodiment, even in the electrode plates 10X and 20Y having such a large area, the connection regions a1 and a2 of the electrode plates 10X and 20Y can be fixed to each other. Therefore, it is possible to prevent the electrode plates 10X and 20Y from being displaced. As a result, it is possible to prevent the positive electrode plate 10X and the negative electrode plate 20Y from being short-circuited, and it is possible to suppress an increase in the man-hours for manufacturing the laminated battery 1.

また、本実施の形態によれば、外装体４０は、金属層４０ａと金属層４０ａの内面に設けられた樹脂接着層４０ｂとを含む第１基材４１と、第１基材４１に対向する第２基材４２と、を有し、第１基材４１と第２基材４２とをヒートシールして第１基材４１と第２基材４２との間に封止空間４５を形成している。一般に、このような所謂ラミネートフィルム型の外装体４０に膜電極接合体５を収容する場合、電極板１０Ｘ，２０Ｙの位置ずれを想定して、外装体４０の封止空間４５を画定する部分（例えば膨出部４４）を余裕を持たせて大きめに設計することが考えられる。この場合、積層型電池１のエネルギー密度が低下し得る。これに対して本実施の形態によれば、電極板１０Ｘ,２０Ｙが位置ずれを起こすことを防止することができるため、外装体４０の封止空間４５を画定する部分を余裕を減らして小さくすることができる。このため、積層型電池１のエネルギー密度の低下を抑制することができる。 Further, according to the present embodiment, the exterior body 40 faces the first base material 41 including the metal layer 40a and the resin adhesive layer 40b provided on the inner surface of the metal layer 40a, and the first base material 41. It has a second base material 42, and the first base material 41 and the second base material 42 are heat-sealed to form a sealing space 45 between the first base material 41 and the second base material 42. ing. Generally, when the membrane electrode assembly 5 is housed in such a so-called laminated film type exterior body 40, a portion (a portion) that defines the sealing space 45 of the exterior body 40 assuming a displacement of the electrode plates 10X and 20Y. For example, it is conceivable to design the bulging portion 44) to be large with a margin. In this case, the energy density of the laminated battery 1 may decrease. On the other hand, according to the present embodiment, since it is possible to prevent the electrode plates 10X and 20Y from being displaced, the portion of the exterior body 40 that defines the sealing space 45 is reduced in size by reducing the margin. be able to. Therefore, it is possible to suppress a decrease in the energy density of the laminated battery 1.

以上において、具体例を参照しながら一実施の形態を説明してきたが、上述した具体例が一実施の形態を限定することを意図していない。上述した一実施の形態は、その他の様々な具体例で実施されることが可能であり、その要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。 In the above, one embodiment has been described with reference to specific examples, but the above-mentioned specific examples are not intended to limit one embodiment. The above-described embodiment can be implemented in various other specific examples, and various omissions, replacements, and changes can be made without departing from the gist thereof.

以下、図面を参照しながら、変形の一例について説明する。以下の説明および以下の説明で用いる図面では、上述した具体例と同様に構成され得る部分について、上述の具体例における対応する部分に対して用いた符号と同一の符号を用いるとともに、重複する説明を省略する。 Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above-mentioned specific examples are used for the parts that can be configured in the same manner as the above-mentioned specific examples, and the same reference numerals are used, and duplicate explanations are given. Is omitted.

（第１の変形例）
上述した実施の形態において、正極固定部１７ａ，１７ｂが、第２方向ｄ２において正極タブ１６の両側に設けられている例を示した。しかしながら、このことに限定されることはなく、正極固定部１７ａ，１７ｂは、正極タブ１６と異なる位置であれば、正極接続部１３の任意の位置に設けられていてもよい。また、正極接続部１３に任意の数の正極固定部１７ａ，１７ｂが設けられていてもよい。 (First modification)
In the above-described embodiment, an example is shown in which the positive electrode fixing portions 17a and 17b are provided on both sides of the positive electrode tab 16 in the second direction d2. However, the present invention is not limited to this, and the positive electrode fixing portions 17a and 17b may be provided at arbitrary positions of the positive electrode connecting portion 13 as long as they are at positions different from those of the positive electrode tab 16. Further, an arbitrary number of positive electrode fixing portions 17a and 17b may be provided on the positive electrode connecting portion 13.

例えば、正極接続部１３の任意の位置に１つの正極固定部のみが設けられていてもよい。この場合、各正極接続領域ａ１の固定に要する時間を短縮することができ、積層型電池１の製造工数の増大を抑制することができる。 For example, only one positive electrode fixing portion may be provided at an arbitrary position of the positive electrode connecting portion 13. In this case, the time required for fixing each positive electrode connection region a1 can be shortened, and an increase in man-hours for manufacturing the laminated battery 1 can be suppressed.

また例えば、正極接続部１３の任意の位置に３つ以上の正極固定部が設けられていてもよい。この場合、各正極接続領域ａ１の固定をより強固にすることができ、正極板１０Ｘが位置ずれを起こすことをより一層防止することができる。 Further, for example, three or more positive electrode fixing portions may be provided at arbitrary positions of the positive electrode connecting portion 13. In this case, the fixation of each positive electrode connection region a1 can be further strengthened, and the positive electrode plate 10X can be further prevented from being displaced.

同様に、負極固定部２７ａ，２７ｂも、負極タブ２６と異なる位置であれば、負極接続部２３の任意の位置に設けられていてもよい。また、負極接続部２３に任意の数の負極固定部２７ａ，２７ｂが設けられていてもよい。 Similarly, the negative electrode fixing portions 27a and 27b may be provided at arbitrary positions of the negative electrode connecting portion 23 as long as they are at positions different from those of the negative electrode tab 26. Further, an arbitrary number of negative electrode fixing portions 27a and 27b may be provided on the negative electrode connecting portion 23.

例えば、負極接続部２３の任意の位置に１つの負極固定部のみが設けられていてもよい。この場合、各負極接続領域ａ２の固定に要する時間を短縮することができ、積層型電池１の製造工数の増大を抑制することができる。 For example, only one negative electrode fixing portion may be provided at an arbitrary position of the negative electrode connecting portion 23. In this case, the time required for fixing each negative electrode connection region a2 can be shortened, and an increase in man-hours for manufacturing the laminated battery 1 can be suppressed.

また例えば、負極接続部２３の任意の位置に３つ以上の負極固定部が設けられていてもよい。この場合、各負極接続領域ａ２の固定をより強固にすることができ、負極板２０Ｙが位置ずれを起こすことをより一層防止することができる。 Further, for example, three or more negative electrode fixing portions may be provided at arbitrary positions of the negative electrode connecting portion 23. In this case, the fixation of each negative electrode connection region a2 can be further strengthened, and the negative electrode plate 20Y can be further prevented from being displaced.

（第２の変形例）
また、上述した実施の形態において、正極固定部１７ａ，１７ｂが、積層方向ｄＬで見たときに正極タブ１６から離間している例を示した。しかしながら、このことに限定されることはなく、正極固定部１７ａ，１７ｂは、正極タブ１６と隣接するように設けられていてもよい。このような場合であっても、各正極板１０Ｘの正極接続領域ａ１を互いに固定することができ、正極板１０Ｘが位置ずれを起こすことを防止することができる。 (Second modification)
Further, in the above-described embodiment, an example is shown in which the positive electrode fixing portions 17a and 17b are separated from the positive electrode tab 16 when viewed in the stacking direction dL. However, the present invention is not limited to this, and the positive electrode fixing portions 17a and 17b may be provided so as to be adjacent to the positive electrode tab 16. Even in such a case, the positive electrode connection regions a1 of the positive electrode plates 10X can be fixed to each other, and it is possible to prevent the positive electrode plates 10X from being displaced.

同様に、負極固定部２７ａ，２７ｂは、負極タブ２６と隣接するように設けられていてもよい。このような場合であっても、各負極板２０Ｙの負極接続領域ａ２を互いに固定することができ、負極板２０Ｙが位置ずれを起こすことを防止することができる。 Similarly, the negative electrode fixing portions 27a and 27b may be provided so as to be adjacent to the negative electrode tab 26. Even in such a case, the negative electrode connection regions a2 of the negative electrode plates 20Y can be fixed to each other, and the negative electrode plates 20Y can be prevented from being displaced.

（第３の変形例）
また、上述した実施の形態において、正極固定部１７ａ，１７ｂが、スポット状に形成されている例を示した。しかしながら、このことに限定されることはなく、正極固定部１７ａ，１７ｂは、所定の広範な領域を有するように形成されてもよい。 (Third variant)
Further, in the above-described embodiment, an example is shown in which the positive electrode fixing portions 17a and 17b are formed in a spot shape. However, the present invention is not limited to this, and the positive electrode fixing portions 17a and 17b may be formed so as to have a predetermined wide area.

例えば、正極固定部１７ａ，１７ｂは、積層方向ｄＬで見たときに正極接続部１３の正極タブ１６が設けられている部分を除く大部分を占めるように形成されてもよい。このような正極固定部１７ａ，１７ｂを形成するために、例えば、各正極接続領域ａ１の所定の領域に外装体４０の樹脂接着層４０ｂを構成する樹脂材料と同一の樹脂材料の組成物を塗工しておき、接合工程において、その領域を高温のヒートバーにより押圧し、各正極接続領域ａ１の樹脂材料を溶解させて、それらを互いに熱溶着させてもよい。また例えば、各正極接続領域ａ１の所定の領域に接着剤を塗工して、各正極接続領域ａ１を互いに接着させてもよい。接着剤は、各正極集電体１１Ｘの電気的な接続を確保するために、導電性接着剤であってもよい。この場合、各正極接続領域ａ１の固定をより強固にすることができ、正極板１０Ｘが位置ずれを起こすことをより一層防止することができる。 For example, the positive electrode fixing portions 17a and 17b may be formed so as to occupy most of the positive electrode connecting portion 13 except the portion where the positive electrode tab 16 is provided when viewed in the stacking direction dL. In order to form such positive electrode fixing portions 17a and 17b, for example, a composition of the same resin material as the resin material constituting the resin adhesive layer 40b of the exterior body 40 is applied to a predetermined region of each positive electrode connection region a1. In the joining step, the regions may be pressed by a high-temperature heat bar to melt the resin materials in the positive electrode connection regions a1 and heat-weld them to each other. Further, for example, an adhesive may be applied to a predetermined region of each positive electrode connection region a1 to adhere the positive electrode connection regions a1 to each other. The adhesive may be a conductive adhesive in order to ensure the electrical connection of each positive electrode current collector 11X. In this case, the fixation of each positive electrode connection region a1 can be further strengthened, and the positive electrode plate 10X can be further prevented from being displaced.

同様に、負極固定部２７ａ，２７ｂも、所定の広範な領域を有するように形成されてもよい。 Similarly, the negative electrode fixing portions 27a and 27b may also be formed so as to have a predetermined wide area.

例えば、負極固定部２７ａ，２７ｂは、積層方向ｄＬで見たときに負極接続部２３の負極タブ２６が設けられている部分を除く大部分を占めるように形成されてもよい。このような負極固定部２７ａ，２７ｂを形成するために、例えば、各負極接続領域ａ２の所定の領域に外装体４０の樹脂接着層４０ｂを構成する樹脂材料と同一の樹脂材料の組成物を塗工しておき、接合工程において、その領域を高温のヒートバーにより押圧し、各負極接続領域ａ２の樹脂材料を溶解させて、それらを互いに熱溶着させてもよい。また例えば、各負極接続領域ａ２の所定の領域に接着剤を塗工して、各負極接続領域ａ２を互いに接着させてもよい。接着剤は、各負極集電体２１Ｙの電気的な接続を確保するために、導電性接着剤であってもよい。この場合、各負極接続領域ａ２の固定をより強固にすることができ、負極板２０Ｙが位置ずれを起こすことをより一層防止することができる。 For example, the negative electrode fixing portions 27a and 27b may be formed so as to occupy most of the negative electrode connecting portion 23 except the portion where the negative electrode tab 26 is provided when viewed in the stacking direction dL. In order to form such negative electrode fixing portions 27a and 27b, for example, a composition of the same resin material as the resin material constituting the resin adhesive layer 40b of the exterior body 40 is applied to a predetermined region of each negative electrode connection region a2. In the joining step, the region may be pressed by a high-temperature heat bar to melt the resin materials in the negative electrode connection regions a2, and the regions may be heat-welded to each other. Further, for example, an adhesive may be applied to a predetermined region of each negative electrode connection region a2 to bond the negative electrode connection regions a2 to each other. The adhesive may be a conductive adhesive in order to secure the electrical connection of each negative electrode current collector 21Y. In this case, the fixation of each negative electrode connection region a2 can be further strengthened, and the negative electrode plate 20Y can be further prevented from being displaced.

（第４の変形例）
また、上述した実施の形態において、正極固定部１７ａ，１７ｂが、超音波接合によって形成される例を示した。しかしながら、このことに限定されることはなく、正極固定部１７ａ，１７ｂは、各正極接続領域ａ１を互いに固定することができれば、任意の方法により形成されてもよい。 (Fourth modification)
Further, in the above-described embodiment, an example is shown in which the positive electrode fixing portions 17a and 17b are formed by ultrasonic bonding. However, the present invention is not limited to this, and the positive electrode fixing portions 17a and 17b may be formed by any method as long as the positive electrode connection regions a1 can be fixed to each other.

例えば、正極固定部１７ａ，１７ｂは、抵抗溶接や熱溶着によって形成されてもよく、抵抗溶接や熱溶着によって各正極接続領域ａ１が互いに接合されて固定されてもよい。また例えば、正極固定部１７ａ，１７ｂは、ステープラによって形成されてもよく、ステープラ用つづり針が各正極接続領域ａ１を積層方向ｄＬに貫通することにより各正極接続領域ａ１が互いに固定されてもよい。また例えば、正極固定部１７ａ，１７ｂは、リベットによって形成されてもよく、各正極接続領域ａ１が互いにリベット止めされて固定されてもよい。また例えば、正極固定部１７ａ，１７ｂは、導電性繊維によって形成されてもよく、導電性繊維が各正極接続領域ａ１にミシン縫いされることにより各正極接続領域ａ１が互いに固定されてもよい。このような場合であっても、各正極板１０Ｘの正極接続領域ａ１を互いに固定することができ、正極板１０Ｘが位置ずれを起こすことを防止することができる。 For example, the positive electrode fixing portions 17a and 17b may be formed by resistance welding or heat welding, or the positive electrode connection regions a1 may be joined to each other and fixed by resistance welding or heat welding. Further, for example, the positive electrode fixing portions 17a and 17b may be formed by staplers, and the positive electrode connecting regions a1 may be fixed to each other by the stapler for the stapler penetrating each positive electrode connecting region a1 in the stacking direction dL. .. Further, for example, the positive electrode fixing portions 17a and 17b may be formed by rivets, or the positive electrode connection regions a1 may be riveted to each other and fixed. Further, for example, the positive electrode fixing portions 17a and 17b may be formed of conductive fibers, and the positive electrode connecting regions a1 may be fixed to each other by sewing the conductive fibers to the positive electrode connecting regions a1. Even in such a case, the positive electrode connection regions a1 of the positive electrode plates 10X can be fixed to each other, and it is possible to prevent the positive electrode plates 10X from being displaced.

同様に、負極固定部２７ａ，２７ｂも、各負極接続領域ａ２を互いに固定することができれば、任意の方法により形成されてもよい。 Similarly, the negative electrode fixing portions 27a and 27b may be formed by any method as long as the negative electrode connection regions a2 can be fixed to each other.

例えば、負極固定部２７ａ，２７ｂは、抵抗溶接や熱溶着によって形成されてもよく、抵抗溶接や熱溶着によって各負極接続領域ａ２が互いに接合されて固定されてもよい。また例えば、負極固定部２７ａ，２７ｂは、ステープラによって形成されてもよく、ステープラ用つづり針が各負極接続領域ａ２を積層方向ｄＬに貫通することにより各負極接続領域ａ２が互いに固定されてもよい。また例えば、負極固定部２７ａ，２７ｂは、リベットによって形成されてもよく、各負極接続領域ａ２が互いにリベット止めされて固定されてもよい。また例えば、負極固定部２７ａ，２７ｂは、導電性繊維によって形成されてもよく、導電性繊維が各負極接続領域ａ２にミシン縫いされることにより各負極接続領域ａ２が互いに固定されてもよい。このような場合であっても、各負極板２０Ｙの負極接続領域ａ２を互いに固定することができ、負極板２０Ｙが位置ずれを起こすことを防止することができる。 For example, the negative electrode fixing portions 27a and 27b may be formed by resistance welding or heat welding, or the negative electrode connection regions a2 may be joined to each other and fixed by resistance welding or heat welding. Further, for example, the negative electrode fixing portions 27a and 27b may be formed by staplers, and the negative electrode connecting regions a2 may be fixed to each other by the stapler for the stapler penetrating each negative electrode connecting region a2 in the stacking direction dL. .. Further, for example, the negative electrode fixing portions 27a and 27b may be formed by rivets, or the negative electrode connection regions a2 may be riveted to each other and fixed. Further, for example, the negative electrode fixing portions 27a and 27b may be formed of conductive fibers, and the negative electrode connecting regions a2 may be fixed to each other by sewing the conductive fibers to the negative electrode connecting regions a2. Even in such a case, the negative electrode connection regions a2 of the negative electrode plates 20Y can be fixed to each other, and the negative electrode plates 20Y can be prevented from being displaced.

（第５の変形例）
また、上述した実施の形態において、固定部１７ａ，１７ｂ，２７ａ，２７ｂが、正極接続部１３および負極接続部２３の両方に設けられている例を示した。しかしながら、このことに限定されることはなく、固定部１７ａ，１７ｂ，２７ａ，２７ｂは、正極接続部１３および負極接続部２３のうちのいずれか一方にのみ設けられていてもよい。このような場合であっても、正極板１０Ｘおよび負極板２０Ｙのうちのいずれか一方が位置ずれを起こすことを防止することができる。 (Fifth variant)
Further, in the above-described embodiment, an example is shown in which the fixing portions 17a, 17b, 27a, 27b are provided in both the positive electrode connecting portion 13 and the negative electrode connecting portion 23. However, the present invention is not limited to this, and the fixing portions 17a, 17b, 27a, 27b may be provided only in one of the positive electrode connecting portion 13 and the negative electrode connecting portion 23. Even in such a case, it is possible to prevent one of the positive electrode plate 10X and the negative electrode plate 20Y from being displaced.

（第６の変形例）
また、上述した実施の形態において、第１基材４１と第２基材４２とが、別体として構成されている例を示した。しかしながら、このことに限定されることはなく、第１基材４１と第２基材４２とが、一体的に連続状に形成されていてもよい。例えば、第１基材４１と第２基材４２とが、第２方向ｄ２における他側（図１における上側）で連続して、単一のシート状に形成されていてもよい。そして、第１基材４１と第２基材４２との境界で折り曲げられて、外装体４０が形成されてもよい。この折り曲げた部分にはシール部４６が形成されていなくてもよい。このように第１基材４１と第２基材４２とが一体的に連続状に形成されていることにより、第１基材４１と第２基材４２とがシールされる部分を少なくすることができ、積層型電池１の封止性能を向上させることができる。 (Sixth variant)
Further, in the above-described embodiment, an example is shown in which the first base material 41 and the second base material 42 are configured as separate bodies. However, the present invention is not limited to this, and the first base material 41 and the second base material 42 may be integrally and continuously formed. For example, the first base material 41 and the second base material 42 may be continuously formed in a single sheet shape on the other side (upper side in FIG. 1) in the second direction d2. Then, the exterior body 40 may be formed by being bent at the boundary between the first base material 41 and the second base material 42. The seal portion 46 may not be formed on the bent portion. Since the first base material 41 and the second base material 42 are integrally and continuously formed in this way, the portion where the first base material 41 and the second base material 42 are sealed is reduced. It is possible to improve the sealing performance of the laminated battery 1.

（第７の変形例）
また、上述した実施の形態において、正極板１０Ｘおよび負極板２０Ｙの間に絶縁シート３１が配置されている例を示した。しかしながら、このことに限定されることはなく、正極板１０Ｘおよび負極板２０Ｙの間に絶縁シート３１が配置されていなくてもよい。このような場合であっても、正極板１０Ｘおよび負極板２０Ｙの少なくとも一方が、他方に対向する面に機能層３０Ａを有していることにより、正極板１０Ｘおよび負極板２０Ｙが短絡することを防止することができる。 (7th variant)
Further, in the above-described embodiment, an example in which the insulating sheet 31 is arranged between the positive electrode plate 10X and the negative electrode plate 20Y is shown. However, the present invention is not limited to this, and the insulating sheet 31 may not be arranged between the positive electrode plate 10X and the negative electrode plate 20Y. Even in such a case, since at least one of the positive electrode plate 10X and the negative electrode plate 20Y has the functional layer 30A on the surface facing the other, the positive electrode plate 10X and the negative electrode plate 20Y are short-circuited. Can be prevented.

１ 積層型電池
３ 電極積層体
５ 膜電極接合体
１０Ｘ 正極板
１１Ｘ 正極集電体
１２Ｘ 正極活物質層
１３ 正極接続部
１６ 正極タブ
１７ａ 正極固定部
１７ｂ 正極固定部
２０Ｙ 負極板
２１Ｙ 負極集電体
２２Ｙ 負極活物質層
２３ 負極接続部
２６ 負極タブ
２７ａ 負極固定部
２７ｂ 負極固定部
４０ 外装体
４０ａ 金属層
４０ｂ 樹脂接着層
４１ 第１基材
４２ 第２基材
４５ 封止空間
ａ１ 正極接続領域
ａ２ 負極接続領域
ｂ１ 正極有効領域
ｂ２ 負極有効領域 1 Laminated battery 3 Electrode laminated body 5 Film electrode joint 10X Positive electrode plate 11X Positive electrode current collector 12X Positive electrode active material layer 13 Positive electrode connection part 16 Positive electrode tab 17a Positive electrode fixing part 17b Positive electrode fixing part 20Y Negative electrode plate 21Y Negative electrode current collector 22Y Negative electrode active material layer 23 Negative electrode connection part 26 Negative electrode tab 27a Negative electrode fixing part 27b Negative electrode fixing part 40 Exterior body 40a Metal layer 40b Resin adhesive layer 41 First base material 42 Second base material 45 Sealing space a1 Positive electrode connection area a2 Negative electrode connection Region b1 Positive electrode effective region b2 Negative electrode effective region

Claims (14)

封止空間を形成する外装体と、
前記封止空間に設けられた膜電極接合体であって、積層方向に交互に積層された複数の第１電極板および複数の第２電極板を有する膜電極接合体と、
前記積層方向で見たときの第１方向において前記膜電極接合体の一側に配置された第１タブと、を備え、
前記第１電極板は、互いに隣接する第１接続領域および第１有効領域を含む第１電極集電体と、前記第１有効領域に設けられた第１電極活物質層と、を含み、
複数の前記第１接続領域が重ね合わされて第１接続部が形成され、
前記第１タブは、前記第１接続部に接合され、
前記第１接続部は、前記積層方向で見たときに前記第１タブとは異なる位置に設けられた第１固定部であって、前記第１接続領域の各々が互いに固定された第１固定部を含む、
積層型電池。 The exterior body that forms the sealing space and
A membrane electrode assembly provided in the sealing space, the membrane electrode assembly having a plurality of first electrode plates and a plurality of second electrode plates alternately laminated in the stacking direction.
A first tab arranged on one side of the membrane electrode assembly in the first direction when viewed in the stacking direction is provided.
The first electrode plate includes a first electrode current collector including a first connection region and a first effective region adjacent to each other, and a first electrode active material layer provided in the first effective region.
A plurality of the first connection regions are overlapped to form a first connection portion, and the first connection portion is formed.
The first tab is joined to the first connection portion and is joined to the first connection portion.
The first connection portion is a first fixing portion provided at a position different from that of the first tab when viewed in the stacking direction, and each of the first connection regions is fixed to each other. Including part,
Stacked battery. 前記第１固定部は、前記積層方向で見たときに前記第１方向に直交する第２方向において前記第１タブの両側に設けられている、
請求項１に記載の積層型電池。 The first fixing portions are provided on both sides of the first tab in a second direction orthogonal to the first direction when viewed in the stacking direction.
The laminated battery according to claim 1. 前記第１固定部は、前記積層方向で見たときに前記第１タブから離間している、
請求項１または２に記載の積層型電池。 The first fixing portion is separated from the first tab when viewed in the stacking direction.
The laminated battery according to claim 1 or 2. 前記第１固定部は、スポット状に形成されている、
請求項３に記載の積層型電池。 The first fixing portion is formed in a spot shape.
The laminated battery according to claim 3. 前記積層方向で見たときの前記第１電極板の面積は、２０，０００ｍｍ２以上である、
請求項１から４のいずれか一項に記載の積層型電池。 The area of the first electrode plate when viewed in the stacking direction is 20,000 mm 2 or more.
The laminated battery according to any one of claims 1 to 4. 前記第１方向において前記膜電極接合体の他側に配置された第２タブを更に備え、
前記第２電極板は、互いに隣接する第２接続領域および第２有効領域を含む第２電極集電体と、前記第２有効領域に設けられた第２電極活物質層と、を含み、
複数の前記第２接続領域が重ね合わされて第２接続部が形成され、
前記第２タブは、前記第２接続部に接合され、
前記第２接続部は、前記積層方向で見たときに前記第２タブとは異なる位置に設けられた第２固定部であって、前記第２接続領域の各々が互いに固定された第２固定部を含む、
請求項１から５のいずれか一項に積層型電池。 Further comprising a second tab located on the other side of the membrane electrode assembly in the first direction.
The second electrode plate includes a second electrode current collector including a second connection region and a second effective region adjacent to each other, and a second electrode active material layer provided in the second effective region.
A plurality of the second connection regions are overlapped to form a second connection portion, and the second connection portion is formed.
The second tab is joined to the second connection portion and is joined to the second connection portion.
The second connecting portion is a second fixing portion provided at a position different from that of the second tab when viewed in the stacking direction, and each of the second connecting regions is fixed to each other. Including part,
The laminated battery according to any one of claims 1 to 5. 前記第２固定部は、前記積層方向で見たときに前記第１方向に直交する第２方向において前記第２タブの両側に設けられている、
請求項６に記載の積層型電池。 The second fixing portions are provided on both sides of the second tab in a second direction orthogonal to the first direction when viewed in the stacking direction.
The laminated battery according to claim 6. 前記第２固定部は、前記積層方向で見たときに前記第２タブから離間している、
請求項６または７に記載の積層型電池。 The second fixing portion is separated from the second tab when viewed in the stacking direction.
The laminated battery according to claim 6 or 7. 前記第２固定部は、スポット状に形成されている、
請求項８に記載の積層型電池。 The second fixing portion is formed in a spot shape.
The laminated battery according to claim 8. 前記積層方向で見たときの前記第２電極板の面積は、２０，０００ｍｍ２以上である、
請求項６から９のいずれか一項に記載の積層型電池。 The area of the second electrode plate when viewed in the stacking direction is 20,000 mm 2 or more.
The laminated battery according to any one of claims 6 to 9. 前記外装体は、金属層と前記金属層の内面に設けられた樹脂接着層とを含む第１基材と、前記第１基材に対向する第２基材と、を有し、前記第１基材と前記第２基材とをヒートシールして、前記第１基材と前記第２基材との間に前記封止空間を形成する、
請求項１から１０のいずれか一項に記載の積層型電池。 The exterior body has a first base material including a metal layer and a resin adhesive layer provided on the inner surface of the metal layer, and a second base material facing the first base material, and the first base material is provided. The base material and the second base material are heat-sealed to form the sealing space between the first base material and the second base material.
The laminated battery according to any one of claims 1 to 10. 複数の第１電極板および複数の第２電極板を積層方向に交互に積層して電極積層体を形成する積層工程であって、前記第１電極板は、互いに隣接する第１接続領域および第１有効領域を含む第１電極集電体と、前記第１有効領域に設けられた第１電極活物質層と、を含み、複数の前記第１接続領域が重ね合わされて第１接続部が形成される、積層工程と、
前記積層工程の後、前記第１接続部で前記第１接続領域の各々を互いに固定して、第１固定部を形成する固定工程と、
前記固定工程の後、前記第１接続部に第１タブを接合するとともに、前記第１接続部で前記第１接続領域の各々を互いに接合して、膜電極接合体を得る接合工程と、
外装体内に前記膜電極接合体を封止する封止工程と、を備え、
前記固定工程において、前記第１固定部は、前記積層方向で見たときに、前記接合工程の際に前記第１タブが接合される位置とは異なる位置に形成される、
積層型電池の製造方法。 A laminating step of alternately laminating a plurality of first electrode plates and a plurality of second electrode plates in a laminating direction to form an electrode laminate, wherein the first electrode plates have a first connection region and a first electrode plate adjacent to each other. A first electrode current collector including one effective region and a first electrode active material layer provided in the first effective region are included, and a plurality of the first connection regions are overlapped to form a first connection portion. The laminating process and
After the laminating step, a fixing step of fixing each of the first connecting regions to each other at the first connecting portion to form a first fixing portion, and a fixing step.
After the fixing step, a joining step of joining the first tab to the first connecting portion and joining each of the first connecting regions to each other at the first connecting portion to obtain a membrane electrode assembly.
A sealing step for sealing the membrane electrode assembly inside the outer body is provided.
In the fixing step, the first fixing portion is formed at a position different from the position where the first tab is joined in the joining step when viewed in the stacking direction.
A method for manufacturing a laminated battery. 前記積層工程において、前記第２電極板は、互いに隣接する第２接続領域および第２有効領域を含む第２電極集電体と、前記第２有効領域に設けられた第２電極活物質層と、を含み、複数の前記第２接続領域が重ね合わされて第２接続部が形成され、
前記固定工程において、前記第２接続部で前記第２接続領域の各々が互いに固定されて、第２固定部が形成され、
前記接合工程において、前記第２接続部に第２タブが接合されるとともに、前記第２接続部で前記第２接続領域の各々が互いに接合され、
前記固定工程において、前記第２固定部は、前記積層方向で見たときに、前記接合工程の際に前記第２タブが接合される位置とは異なる位置に形成される、
請求項１２に積層型電池の製造方法。 In the laminating step, the second electrode plate includes a second electrode current collector including a second connecting region and a second effective region adjacent to each other, and a second electrode active material layer provided in the second effective region. , And a plurality of the second connection regions are superposed to form a second connection portion.
In the fixing step, each of the second connecting regions is fixed to each other at the second connecting portion to form a second fixing portion.
In the joining step, the second tab is joined to the second connecting portion, and each of the second connecting regions is joined to each other at the second connecting portion.
In the fixing step, the second fixing portion is formed at a position different from the position where the second tab is joined in the joining step when viewed in the stacking direction.
12. A method for manufacturing a laminated battery. 前記封止工程において、前記外装体は、金属層と前記金属層の内面に設けられた樹脂接着層とを含む第１基材と、前記第１基材に対向する第２基材と、を有し、前記第１基材と前記第２基材とをヒートシールして、前記第１基材と前記第２基材との間に前記膜電極接合体が封止される、
請求項１２または１３に記載の積層型電池の製造方法。 In the sealing step, the exterior body includes a first base material including a metal layer and a resin adhesive layer provided on the inner surface of the metal layer, and a second base material facing the first base material. The membrane electrode assembly is sealed between the first base material and the second base material by heat-sealing the first base material and the second base material.
The method for manufacturing a laminated battery according to claim 12 or 13.
JP2019174663A 2019-09-25 2019-09-25 Manufacturing method of stacked batteries Active JP6835925B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2019174663A JP6835925B1 (en) 2019-09-25 2019-09-25 Manufacturing method of stacked batteries
CN202080005511.6A CN114391193A (en) 2019-09-25 2020-09-24 Laminated battery and method for manufacturing laminated battery
PCT/JP2020/036111 WO2021060399A1 (en) 2019-09-25 2020-09-24 Stacked battery and method for producing stacked battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019174663A JP6835925B1 (en) 2019-09-25 2019-09-25 Manufacturing method of stacked batteries

Publications (2)

Publication Number Publication Date
JP6835925B1 JP6835925B1 (en) 2021-02-24
JP2021051935A true JP2021051935A (en) 2021-04-01

Family

ID=74661721

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2019174663A Active JP6835925B1 (en) 2019-09-25 2019-09-25 Manufacturing method of stacked batteries

Country Status (3)

Country Link
JP (1) JP6835925B1 (en)
CN (1) CN114391193A (en)
WO (1) WO2021060399A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113381131B (en) * 2021-05-27 2022-09-02 万向一二三股份公司 Method for improving fracture of lithium ion battery tab foil

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002252036A (en) * 2001-02-23 2002-09-06 Mitsubishi Materials Corp Lithium ion polymer secondary battery
JP2009038004A (en) * 2007-07-11 2009-02-19 Nissan Motor Co Ltd Laminated battery
JP2011119213A (en) * 2009-12-01 2011-06-16 Samsung Sdi Co Ltd Secondary battery
JP2012124146A (en) * 2010-11-17 2012-06-28 Sony Corp Secondary battery, battery unit, and battery module
JP2013008564A (en) * 2011-06-24 2013-01-10 Sharp Corp Nonaqueous secondary battery, and method of manufacturing the same
WO2017090391A1 (en) * 2015-11-25 2017-06-01 Ｎｅｃエナジーデバイス株式会社 Electrochemical device
JP2019067607A (en) * 2017-09-29 2019-04-25 積水化学工業株式会社 Stacked battery and manufacturing method of stacked battery

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012142153A (en) * 2010-12-28 2012-07-26 Mitsubishi Heavy Ind Ltd Battery

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002252036A (en) * 2001-02-23 2002-09-06 Mitsubishi Materials Corp Lithium ion polymer secondary battery
JP2009038004A (en) * 2007-07-11 2009-02-19 Nissan Motor Co Ltd Laminated battery
JP2011119213A (en) * 2009-12-01 2011-06-16 Samsung Sdi Co Ltd Secondary battery
JP2012124146A (en) * 2010-11-17 2012-06-28 Sony Corp Secondary battery, battery unit, and battery module
JP2013008564A (en) * 2011-06-24 2013-01-10 Sharp Corp Nonaqueous secondary battery, and method of manufacturing the same
WO2017090391A1 (en) * 2015-11-25 2017-06-01 Ｎｅｃエナジーデバイス株式会社 Electrochemical device
JP2019067607A (en) * 2017-09-29 2019-04-25 積水化学工業株式会社 Stacked battery and manufacturing method of stacked battery

Also Published As

Publication number Publication date
WO2021060399A1 (en) 2021-04-01
JP6835925B1 (en) 2021-02-24
CN114391193A (en) 2022-04-22

Similar Documents

Publication Publication Date Title
JP5233435B2 (en) Bipolar secondary battery
US20120244423A1 (en) Laminate case secondary battery
JP3758629B2 (en) Laminate sheet and laminate battery using the same
JPWO2015159433A1 (en) Prismatic secondary battery
WO2014141640A1 (en) Laminate exterior cell
US11444332B2 (en) Secondary battery
WO2021060400A1 (en) Stacked battery and method of transporting stacked battery
WO2021060399A1 (en) Stacked battery and method for producing stacked battery
WO2013051138A1 (en) Assembled battery and production method for assembled battery
WO2021060398A1 (en) Layered battery
JP2020095907A (en) Lamination type battery and manufacturing method of lamination type battery
JP5664068B2 (en) Multilayer battery and method of manufacturing multilayer battery
JP2020144996A (en) Power storage element and manufacturing method of power storage element
JP6889222B2 (en) Laminated battery and manufacturing method of laminated battery
JP6832477B2 (en) Laminated battery and manufacturing method of laminated battery
JP6846490B1 (en) Power storage element and manufacturing method of power storage element
JP2020170636A (en) Laminated battery
JP7193407B2 (en) stacked battery
JP2020140833A (en) Lamination type battery and method of manufacturing lamination type battery
JP2020170635A (en) Method of manufacturing power storage element
JP2020170634A (en) Power storage element
JP2020170667A (en) Manufacturing method of stacked battery and stacked batteries
JP2020144997A (en) Power storage element and manufacturing method of power storage element
JP2020140891A (en) Laminated battery
JP2020149798A (en) Laminated battery and manufacturing method thereof

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20201019

A871 Explanation of circumstances concerning accelerated examination

Free format text: JAPANESE INTERMEDIATE CODE: A871

Effective date: 20201019

A975 Report on accelerated examination

Free format text: JAPANESE INTERMEDIATE CODE: A971005

Effective date: 20201030

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20201120

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20210105

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20210115

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20210204

R151 Written notification of patent or utility model registration

Ref document number: 6835925

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250