WO2017158702A1 - Electrical storage device - Google Patents

Electrical storage device Download PDF

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Publication number
WO2017158702A1
WO2017158702A1 PCT/JP2016/058038 JP2016058038W WO2017158702A1 WO 2017158702 A1 WO2017158702 A1 WO 2017158702A1 JP 2016058038 W JP2016058038 W JP 2016058038W WO 2017158702 A1 WO2017158702 A1 WO 2017158702A1
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WO
WIPO (PCT)
Prior art keywords
electrode
storage device
separator
insulating tape
case
Prior art date
Application number
PCT/JP2016/058038
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French (fr)
Japanese (ja)
Inventor
昌史 樋口
Original Assignee
株式会社村田製作所
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to PCT/JP2016/058038 priority Critical patent/WO2017158702A1/en
Publication of WO2017158702A1 publication Critical patent/WO2017158702A1/en

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    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • 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
    • 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

Definitions

  • the present invention relates to a power storage device.
  • Patent Document 1 describes an electricity storage device having an electrode body in which a positive electrode, a separator, and a negative electrode are stacked.
  • an insulating sheet that restricts a short circuit between a metal case and an electrode body (electrode assembly) is provided on the inner wall of the case.
  • the main object of the present invention is to provide a power storage device that is less prone to short circuit defects.
  • the electricity storage device includes a rectangular parallelepiped metal case, an electrode body, an electrolyte, a first electrode terminal, and a second electrode terminal.
  • the electrode body is arranged in the case.
  • the electrode body includes a rectangular first electrode, a rectangular second electrode, and a separator.
  • the separator is disposed between the first electrode and the second electrode.
  • the electrolyte is impregnated in the separator.
  • the 1st electrode terminal is provided in the end surface located in the one side of the length direction of a case.
  • the first electrode terminal is electrically connected to the first electrode.
  • the second electrode terminal is provided on an end surface located on one side in the length direction of the case.
  • the second electrode terminal is electrically connected to the second electrode.
  • the entire first electrode When viewed in plan, the entire first electrode is positioned on the second electrode in the length direction.
  • the electrode body is provided so as to cover the side surfaces of the first electrode, the second electrode, and the separator, and further includes an insulating tape that integrates the first electrode, the second electrode, and the separator.
  • the insulating tape is entirely covered with the insulating tape in the length direction of the side surface of the first electrode.
  • the electrode body is not easily displaced in the length direction.
  • the electrode body is easily displaced in the width direction perpendicular to the length direction. Therefore, the side surface of the electrode body and the metal case are in contact with each other and short circuit failure is likely to occur. In view of this, it is preferable to cover the entire length of the side surface of the electrode body with an insulating tape.
  • the insulating tape is provided so that the entire length of the side surface of the first electrode is covered with the insulating tape. For this reason, it is suppressed that the 1st electrode contacts a metal case. Therefore, in the electricity storage device according to the present invention, short circuit failure is unlikely to occur.
  • the electricity storage device according to the present invention further includes an adhesive layer that adheres the case and the electrode body.
  • the electricity storage device includes a first connection member that connects the first electrode and the first electrode terminal, and a second connection that connects the second electrode and the second electrode terminal. It is preferable to further include a connection member.
  • the first electrode may constitute a positive electrode
  • the second electrode may constitute a negative electrode
  • FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment.
  • FIG. 2 is a schematic plan view of the electricity storage device according to the first embodiment.
  • 3 is a schematic cross-sectional view taken along line III-III in FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.
  • FIG. 5 is a schematic cross-sectional view of the electricity storage device according to the second embodiment.
  • FIG. 6 is a schematic cross-sectional view of the electricity storage device according to the third embodiment.
  • FIG. 7 is a schematic cross-sectional view of the electricity storage device according to the fourth embodiment.
  • FIG. 1 is a schematic perspective view of the electricity storage device according to this embodiment.
  • FIG. 2 is a schematic plan view of the electricity storage device according to this embodiment.
  • 3 is a schematic cross-sectional view taken along line III-III in FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.
  • a power storage device 1 shown in FIGS. 1 to 4 is a power storage device including an electrolyte 4.
  • the electricity storage device 1 may be, for example, a battery such as a secondary battery or a capacitor such as an electric double layer capacitor.
  • the power storage device 1 includes a rectangular parallelepiped case 2.
  • the “cuboid shape” includes a rectangular parallelepiped shape having a shape with rounded corners in plan view.
  • Case 2 is metallic with conductivity.
  • the case 2 can be made of, for example, aluminum, stainless steel, copper, or the like.
  • an electrode body 3 is arranged inside the case 2.
  • the electrode body 3 includes a rectangular positive electrode 31, a rectangular negative electrode 32, and a separator 33.
  • the positive electrode 31 and the negative electrode 32 face each other in the stacking direction T with the separator 33 interposed therebetween.
  • a separator 33 is disposed between the positive electrode 31 and the negative electrode 32 in the stacking direction T.
  • the separator 33 insulates the positive electrode 31 and the negative electrode 32 from each other.
  • the end sides of the separators 33 adjacent to each other are connected via the positive electrode 31.
  • the two separators 33 adjacent to each other constitute a bag-shaped separator 33a.
  • the positive electrode 31 is disposed in the bag-shaped separator 33a.
  • a sheet-like separator may be provided between the positive electrode and the negative electrode.
  • the separator 33 may be fixed to the surface of the positive electrode 31 or the negative electrode 32.
  • the separator 33 may have a ninety-nine fold shape arranged between the positive electrode 31 and the negative electrode 32 while being folded.
  • the positive electrode 31 constitutes a “first electrode” and the negative electrode 32 constitutes a “second electrode”.
  • the configuration of the positive electrode 31 can be appropriately determined depending on the type of the electricity storage device 1.
  • the positive electrode 31 can be configured by a positive electrode current collector and an active material layer provided on at least one surface of the positive electrode current collector.
  • the positive electrode 31 can be constituted by a positive electrode current collector and a polarizable electrode layer provided on at least one surface of the positive electrode current collector. it can.
  • the configuration of the negative electrode 32 can be appropriately determined depending on the type of the electricity storage device 1.
  • the negative electrode 32 when the electricity storage device 1 is a secondary battery, the negative electrode 32 can be constituted by a negative electrode current collector and an active material layer provided on at least one surface of the negative electrode current collector.
  • the negative electrode 32 when the electricity storage device 1 is an electric double layer capacitor, the negative electrode 32 can be constituted by a negative electrode current collector and a polarizable electrode layer provided on at least one surface of the negative electrode current collector. it can.
  • the separator 33 can be constituted by, for example, a porous sheet having continuous holes through which ions in the electrolyte can move.
  • the separator 33 may be made of, for example, polypropylene, polyethylene, polyimide, cellulose, aramid, polyvinylidene fluoride, Teflon (registered trademark), or the like.
  • the surface of the separator 33 may be covered with a ceramic coat layer, an adhesive layer, or the like.
  • the surface of the separator 33 may have adhesiveness.
  • the separator 33 may be a single layer film made of one material, or a composite film or a multilayer film made of one kind or two or more kinds of materials.
  • the positive electrode 31 is the smallest.
  • the entire positive electrode (first electrode) 31 is located on the negative electrode (second electrode) 32 in the length direction L.
  • the negative electrode 32 extends to the outside of the positive electrode 31 on both sides in the length direction L, and the negative electrode 32 extends to the outside of the positive electrode 31 on both sides in the width direction W. .
  • the positive electrode 31, the separator 33, the negative electrode 32, and the separator 33 are laminated a plurality of times in this order.
  • the electrode body 3 is constituted by the laminated body 70 and the insulating tape 5 of the plurality of positive electrodes 31, the plurality of separators 33, and the plurality of negative electrodes 32.
  • the electrode body 3 is integrated by an insulating tape 5.
  • the insulating tape 5 is provided so as to cover the side surface of the laminate 70 of the positive electrode 31, the negative electrode 32, and the separator 33, and the laminate 70 is integrated.
  • the insulating tape 5 includes a first insulating tape 51 and a second insulating tape 52.
  • the first insulating tape 51 is provided on the W1 side of the laminated body 70.
  • the first insulating tape 51 straddles the first main surface 70a and the second main surface 70b of the multilayer body 70 via one side (W1 side) side surface in the width direction W of the multilayer body 70. It is provided.
  • the first insulating tape 51 and the first main surface 70a are joined, and the first insulating tape 51 and the second main surface 70b are joined, so that the first end is obtained. At least the distal end portion of the first end portion 33e1 is held so that at least the distal end portion of the portion 33e1 is bent toward one side (T1 side) in the stacking direction T.
  • the second insulating tape 52 is provided on the W2 side of the laminated body 70.
  • the second insulating tape 52 straddles the first main surface 70a and the second main surface 70b of the multilayer body 70 via the other side (W2 side) side surface in the width direction W of the multilayer body 70. It is provided. Since the second insulating tape 52 and the first main surface 70a are joined, and the second insulating tape 52 and the second main surface 70b are joined, the second end is obtained. At least the distal end portion of the second end portion 33e2 is held so that at least the distal end portion of the portion 33e2 is bent toward one side (T1 side) in the stacking direction T.
  • the joining method of the insulating tapes 51 and 52 and the laminated body 70 is not specifically limited.
  • the insulating tapes 51 and 52 and the laminated body 70 may be directly bonded, or may be bonded by using an adhesive to be adhesively bonded.
  • the insulating tapes 51 and 52 may be formed of an adhesive tape, and the insulating tapes 51 and 52 may be bonded to the laminate 70.
  • the insulating tapes 51 and 52 are constituted by double-sided adhesive tape, and the insulating tapes 51 and 52 are bonded to the laminate 70, and the laminate 70 and the case 2 are bonded by the insulating tapes 51 and 52. It may be fixed by. By doing so, the displacement of the stacked body 70 in the case 2 is effectively suppressed.
  • the adhesive includes an adhesive and an adhesive.
  • the adhesive tape includes an adhesive tape and an adhesive tape.
  • the insulating tape 5 may be composed of, for example, a resin tape made of polyimide, polypropylene, acrylic, etc., or a metal foil such as aluminum foil, copper foil, stainless steel foil, or nickel foil coated with an insulating layer. it can.
  • the electrode body 3 and the case 2 are joined. Specifically, the electrode body 3 is bonded and fixed to the inner surface of the case 2 with an adhesive layer 6. Thereby, it is suppressed that the inner surface of case 2 and the electrode body 3 contact.
  • the electrode body 3 is bonded to the case 2 on the upper side (T1 side) in the figure, but may be bonded to the lower side in the figure.
  • the electricity storage device 1 has a positive electrode terminal 41 and a negative electrode terminal 42.
  • the positive terminal 41 constitutes a “first electrode terminal”
  • the negative terminal 42 constitutes a “second electrode terminal”.
  • the positive electrode terminal 41 and the negative electrode terminal 42 are respectively provided on the end surface 2 a located on one side in the length direction L of the case 2.
  • the negative electrode terminal 42 is electrically connected to the negative electrode 32. Specifically, the negative electrode 32 and the negative electrode terminal 42 are electrically connected by the second connection member 62. One side portion of the second connection member 62 is connected to the negative electrode lead portion 32 a extending from the negative electrode 32, and the other side portion is connected to the negative electrode terminal 42.
  • the separator 33 is impregnated with the electrolyte 4.
  • the electrode body 3 is impregnated with the electrolyte 4.
  • the electrolyte 4 may be, for example, an electrolytic solution.
  • the electrolyte 3 can be appropriately determined according to the type of the electricity storage device 1, the characteristics required for the electricity storage device 1, the material of the positive electrode 31, the material of the negative electrode 32, and the like.
  • the positive electrode terminal 41 and the negative electrode terminal 42 are provided in the end surface 2a.
  • the stacked body 70 (see FIG. 3) is not easily displaced in the length direction L.
  • the stacked body 70 is easily displaced in the width direction W perpendicular to the length direction L. Therefore, the side surface of the laminated body 70 and the metal case 2 are in contact with each other, and short circuit failure is likely to occur. In view of this, it is considered preferable to cover the entire side surface of the laminate 70 with the insulating tape 5.
  • the present inventors have found that when the entire side surface of the laminate is covered with an insulating tape, the charge / discharge cycle characteristics of the electricity storage device are lowered. As a result of further diligent research, the present inventors have found that the cause is that the electrolyte does not flow sufficiently during charging and discharging, so that the charge / discharge cycle characteristics of the electricity storage device are low. Invented the invention.
  • the insulating tape 5 is provided so that the entire side surface of the positive electrode 31 in the length direction L is covered with the insulating tape. For this reason, it is suppressed that the positive electrode 31 contacts the metal case 2. Therefore, the electrical storage device 1 is unlikely to cause a short circuit failure.
  • the insulating tape 5 is provided such that a part of the side surface of the negative electrode 32 in the length direction L is exposed from the insulating tape 5. For this reason, the electrolyte 4 tends to flow during charging and discharging. Therefore, the electricity storage device 1 has excellent charge / discharge cycle characteristics.
  • the insulating tape 5 is entirely covered with the insulating tape in the length direction L of the side surface of the positive electrode 31, and part of the side surface of the negative electrode 32 in the length direction L is It is provided so as to be exposed from the insulating tape 5.
  • the electrical storage device 1 has excellent charge / discharge cycle characteristics, and the electrical storage device 1 is unlikely to cause a short circuit failure.
  • the electricity storage device 1 since it is not necessary to insulate the inner surface of the case, the electricity storage device 1 has a simple structure and is easy to manufacture.
  • an adhesive layer 6 that bonds the case 2 and the electrode body 3 is provided. For this reason, it is more effectively suppressed that the electrode body 3 is displaced relative to the case 2. Therefore, in the electricity storage device 1, a short circuit failure is less likely to occur.
  • the adhesive layer 6 bonds the main surface of the electrode body 3 and the inner surface of the main wall of the case 2. Therefore, displacement of the electrode body 3 relative to the case 2 is further effectively suppressed. Therefore, in the electricity storage device 1, a short circuit failure is less likely to occur.
  • FIG. 5 is a schematic cross-sectional view of an electricity storage device 1a according to the second embodiment.
  • the insulating tape 5 is composed of a plurality of tapes of the first insulating tape 51 and the second insulating tape 52 .
  • the present invention is not limited to this configuration.
  • the tape may be provided integrally.
  • the first insulating tape 51 and the second insulating tape 52 may be connected on the second main surface 70 b of the laminate 70. In this case, the number of parts constituting the power storage device 1 can be reduced. Further, the insulating tape 5 can be firmly fixed to the laminated body 70.
  • FIG. 6 is a schematic cross-sectional view of an electricity storage device 1b according to the third embodiment.
  • the insulating tape 5 may wind the laminate 70.
  • FIG. 7 is a schematic cross-sectional view of the electricity storage device according to the fourth embodiment.
  • the separator 33 adjacent in the stacking direction T via the positive electrode 31 constitutes the bag-shaped separator 33a
  • the present invention is not limited to this configuration.
  • a plurality of sheet-like separators 33 may be separately provided as shown in FIG.
  • the separator 33 may be connected to both surfaces of the positive electrode 31, for example.
  • the separator 33 may have a ninety-nine fold shape arranged between the positive electrode 31 and the negative electrode 32 while being folded.

Abstract

Provided is an electrical storage device in which short circuit failure is suppressed. When seen in plan view, the entirety of a first electrode 31 is located above a second electrode 32 in a longitudinal direction L. An electrode body 3 further has an insulating tape 5 being provided so as to cover a side surface of a separator 33, the first electrode 31, and the second electrode 32, and integrating the separator 33, the first electrode 31, and the second electrode 32. The entirety of a side surface of the first electrode 31 in the longitudinal direction L is covered by the insulating tape 5.

Description

蓄電デバイスPower storage device
　本発明は、蓄電デバイスに関する。 The present invention relates to a power storage device.
　従来、種々の電子機器の電源として、蓄電デバイスが用いられている。例えば、特許文献１には、正極、セパレータ及び負極が積層された電極体を有する蓄電デバイスが記載されている。特許文献１に記載された蓄電デバイスでは、金属製のケースと電極体（電極組立体）との短絡を規制する絶縁シートがケースの内壁の上に設けられている。 Conventionally, power storage devices have been used as power sources for various electronic devices. For example, Patent Document 1 describes an electricity storage device having an electrode body in which a positive electrode, a separator, and a negative electrode are stacked. In the electric storage device described in Patent Document 1, an insulating sheet that restricts a short circuit between a metal case and an electrode body (electrode assembly) is provided on the inner wall of the case.
特開２０１５－１４６２５２号公報JP2015-146252A
　金属製のケースを用いる場合、特許文献１に記載のように、ケースと電極体とが短絡しないように、絶縁処理を行う必要がある。このため、蓄電デバイスの製造が煩雑になると共に、蓄電デバイスの構成が複雑になるという問題がある。 When using a metal case, as described in Patent Document 1, it is necessary to perform an insulation treatment so that the case and the electrode body are not short-circuited. For this reason, there exists a problem that manufacture of an electrical storage device becomes complicated and the structure of an electrical storage device becomes complicated.
　本発明の主な目的は、短絡不良が生じにくい蓄電デバイスを提供することにある。 The main object of the present invention is to provide a power storage device that is less prone to short circuit defects.
　本発明に係る蓄電デバイスは、直方体状の金属製ケースと、電極体と、電解質と、第１の電極端子と、第２の電極端子とを備える。電極体は、ケース内に配されている。電極体は、矩形状の第１の電極と、矩形状の第２の電極と、セパレータとを有する。セパレータは、第１の電極と第２の電極との間に配されている。電解質は、セパレータに含浸されている。第１の電極端子は、ケースの長さ方向の一方側に位置する端面に設けられている。第１の電極端子は、第１の電極と電気的に接続されている。第２の電極端子は、ケースの長さ方向の一方側に位置する端面に設けられている。第２の電極端子は、第２の電極と電気的に接続されている。平面視した際に、長さ方向において、第１の電極の全体が第２の電極の上に位置している。電極体は、第１の電極、第２の電極及びセパレータの側面を覆うように設けられており、第１の電極、第２の電極及びセパレータを一体化している絶縁性テープをさらに有する。絶縁性テープは、第１の電極の側面の長さ方向における全体が絶縁性テープにより覆われている。 The electricity storage device according to the present invention includes a rectangular parallelepiped metal case, an electrode body, an electrolyte, a first electrode terminal, and a second electrode terminal. The electrode body is arranged in the case. The electrode body includes a rectangular first electrode, a rectangular second electrode, and a separator. The separator is disposed between the first electrode and the second electrode. The electrolyte is impregnated in the separator. The 1st electrode terminal is provided in the end surface located in the one side of the length direction of a case. The first electrode terminal is electrically connected to the first electrode. The second electrode terminal is provided on an end surface located on one side in the length direction of the case. The second electrode terminal is electrically connected to the second electrode. When viewed in plan, the entire first electrode is positioned on the second electrode in the length direction. The electrode body is provided so as to cover the side surfaces of the first electrode, the second electrode, and the separator, and further includes an insulating tape that integrates the first electrode, the second electrode, and the separator. The insulating tape is entirely covered with the insulating tape in the length direction of the side surface of the first electrode.
　蓄電デバイスにおいては、端面に第１及び第２の電極端子が設けられているため、電極体は、長さ方向に変位しにくい。電極体は、長さ方向に対して垂直な幅方向に変位しやすい。従って、電極体の側面と金属製ケースとが接触して短絡不良が生じやすい。これに鑑みれば、電極体の側面の長さ方向における全体を絶縁性テープで覆うことが好ましい。 In the electricity storage device, since the first and second electrode terminals are provided on the end face, the electrode body is not easily displaced in the length direction. The electrode body is easily displaced in the width direction perpendicular to the length direction. Therefore, the side surface of the electrode body and the metal case are in contact with each other and short circuit failure is likely to occur. In view of this, it is preferable to cover the entire length of the side surface of the electrode body with an insulating tape.
　本発明に係る蓄電デバイスでは、絶縁性テープが、第１の電極の側面の長さ方向における全体が絶縁性テープにより覆われるように設けられている。このため、第１の電極が金属製のケースと接触することが抑制されている。従って、本発明に係る蓄電デバイスでは、短絡不良が生じ難い。 In the electricity storage device according to the present invention, the insulating tape is provided so that the entire length of the side surface of the first electrode is covered with the insulating tape. For this reason, it is suppressed that the 1st electrode contacts a metal case. Therefore, in the electricity storage device according to the present invention, short circuit failure is unlikely to occur.
　本発明に係る蓄電デバイスは、ケースと電極体とを接着している接着層をさらに備えることが好ましい。 It is preferable that the electricity storage device according to the present invention further includes an adhesive layer that adheres the case and the electrode body.
　本発明に係る蓄電デバイスは、第１の電極と第１の電極端子とを接続している第１の接続部材と、第２の電極と第２の電極端子とを接続している第２の接続部材とをさらに備えていることが好ましい。 The electricity storage device according to the present invention includes a first connection member that connects the first electrode and the first electrode terminal, and a second connection that connects the second electrode and the second electrode terminal. It is preferable to further include a connection member.
　本発明に係る蓄電デバイスでは、第１の電極が正極を構成しており、第２の電極が負極を構成していてもよい。 In the electricity storage device according to the present invention, the first electrode may constitute a positive electrode, and the second electrode may constitute a negative electrode.
　本発明によれば、短絡不良が生じにくい蓄電デバイスを提供することができる。 According to the present invention, it is possible to provide an electricity storage device in which short circuit failure is unlikely to occur.
図１は、第１の実施形態に係る蓄電デバイスの模式的斜視図である。FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment. 図２は、第１の実施形態に係る蓄電デバイスの模式的平面図である。FIG. 2 is a schematic plan view of the electricity storage device according to the first embodiment. 図３は、図１の線ＩＩＩ－ＩＩＩにおける模式的断面図である。3 is a schematic cross-sectional view taken along line III-III in FIG. 図４は、図１の線ＩＶ－ＩＶにおける模式的断面図である。4 is a schematic cross-sectional view taken along line IV-IV in FIG. 図５は、第２の実施形態に係る蓄電デバイスの模式的断面図である。FIG. 5 is a schematic cross-sectional view of the electricity storage device according to the second embodiment. 図６は、第３の実施形態に係る蓄電デバイスの模式的断面図である。FIG. 6 is a schematic cross-sectional view of the electricity storage device according to the third embodiment. 図７は、第４の実施形態に係る蓄電デバイスの模式的断面図である。FIG. 7 is a schematic cross-sectional view of the electricity storage device according to the fourth embodiment.
　以下、本発明を実施した好ましい形態の一例について説明する。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。 Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.
　また、実施形態等において参照する各図面において、実質的に同一の機能を有する部材は同一の符号で参照することとする。また、実施形態等において参照する図面は、模式的に記載されたものである。図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。具体的な物体の寸法比率等は、以下の説明を参酌して判断されるべきである。 In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described. A ratio of dimensions of an object drawn in a drawing may be different from a ratio of dimensions of an actual object. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.
　（第１の実施形態）
　図１は、本実施形態に係る蓄電デバイスの模式的斜視図である。図２は、本実施形態に係る蓄電デバイスの模式的平面図である。図３は、図１の線ＩＩＩ－ＩＩＩにおける模式的断面図である。図４は、図１の線ＩＶ－ＩＶにおける模式的断面図である。 (First embodiment)
FIG. 1 is a schematic perspective view of the electricity storage device according to this embodiment. FIG. 2 is a schematic plan view of the electricity storage device according to this embodiment. 3 is a schematic cross-sectional view taken along line III-III in FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.
　図１～図４に示す蓄電デバイス１は、電解質４を備える蓄電デバイスである。具体的には、蓄電デバイス１は、例えば、二次電池等の電池、電気二重層コンデンサ等のコンデンサ等であってもよい。 A power storage device 1 shown in FIGS. 1 to 4 is a power storage device including an electrolyte 4. Specifically, the electricity storage device 1 may be, for example, a battery such as a secondary battery or a capacitor such as an electric double layer capacitor.
　図３に示すように、蓄電デバイス１は、直方体状のケース２を備えている。なお、本発明において、「直方体状」には、平面視において、角部が丸められた形状を有する直方体状が含まれるものとする。 As shown in FIG. 3, the power storage device 1 includes a rectangular parallelepiped case 2. In the present invention, the “cuboid shape” includes a rectangular parallelepiped shape having a shape with rounded corners in plan view.
　ケース２は、導電性を有する金属性である。ケース２は、例えば、アルミニウム、ステンレス、銅等により構成することができる。 Case 2 is metallic with conductivity. The case 2 can be made of, for example, aluminum, stainless steel, copper, or the like.
　図３に示すように、ケース２の内部には、電極体３が配されている。電極体３は、矩形状の正極３１と、矩形状の負極３２と、セパレータ３３とを有する。正極３１と負極３２とは、セパレータ３３を介して積層方向Ｔにおいて対向している。積層方向Ｔにおいて、正極３１と負極３２との間には、セパレータ３３が配されている。このセパレータ３３により、正極３１と負極３２とが絶縁されている。本実施形態では、具体的には、正極３１を介して隣り合うセパレータ３３の端辺同士が接続されている。それら隣り合う２枚のセパレータ３３によって、袋状のセパレータ３３ａが構成されている。正極３１は、この袋状セパレータ３３ａ内に配されている。もっとも、本発明において、積層方向Ｔにおいて隣り合うセパレータが接合されて袋状にされていなくてもよい。本発明においては、シート状のセパレータが正極と負極との間に設けられていてもよい。セパレータ３３は、正極３１または負極３２の表面に固着されるようにしてもよい。セパレータ３３は、折り返しながら正極３１と負極３２の間に配置される九十九折状でもよい。 As shown in FIG. 3, an electrode body 3 is arranged inside the case 2. The electrode body 3 includes a rectangular positive electrode 31, a rectangular negative electrode 32, and a separator 33. The positive electrode 31 and the negative electrode 32 face each other in the stacking direction T with the separator 33 interposed therebetween. A separator 33 is disposed between the positive electrode 31 and the negative electrode 32 in the stacking direction T. The separator 33 insulates the positive electrode 31 and the negative electrode 32 from each other. In the present embodiment, specifically, the end sides of the separators 33 adjacent to each other are connected via the positive electrode 31. The two separators 33 adjacent to each other constitute a bag-shaped separator 33a. The positive electrode 31 is disposed in the bag-shaped separator 33a. But in this invention, the separator which adjoins in the lamination direction T does not need to be joined and made into the bag shape. In the present invention, a sheet-like separator may be provided between the positive electrode and the negative electrode. The separator 33 may be fixed to the surface of the positive electrode 31 or the negative electrode 32. The separator 33 may have a ninety-nine fold shape arranged between the positive electrode 31 and the negative electrode 32 while being folded.
　なお、本実施形態では、正極３１が「第１の電極」を構成しており、負極３２が「第２の電極」を構成している。 In the present embodiment, the positive electrode 31 constitutes a “first electrode” and the negative electrode 32 constitutes a “second electrode”.
　正極３１の構成は、蓄電デバイス１の種類によって適宜決定することができる。例えば、蓄電デバイス１が二次電池である場合は、正極３１は、正極集電体と、正極集電体の少なくとも一方面の上に設けられた活物質層とにより構成することができる。例えば、蓄電デバイス１が、電気二重層コンデンサである場合は、正極３１は、正極集電体と、正極集電体の少なくとも一方面の上に設けられた分極性電極層とにより構成することができる。 The configuration of the positive electrode 31 can be appropriately determined depending on the type of the electricity storage device 1. For example, when the electricity storage device 1 is a secondary battery, the positive electrode 31 can be configured by a positive electrode current collector and an active material layer provided on at least one surface of the positive electrode current collector. For example, when the electricity storage device 1 is an electric double layer capacitor, the positive electrode 31 can be constituted by a positive electrode current collector and a polarizable electrode layer provided on at least one surface of the positive electrode current collector. it can.
　負極３２の構成は、蓄電デバイス１の種類によって適宜決定することができる。例えば、蓄電デバイス１が二次電池である場合は、負極３２は、負極集電体と、負極集電体の少なくとも一方面の上に設けられた活物質層とにより構成することができる。例えば、蓄電デバイス１が、電気二重層コンデンサである場合は、負極３２は、負極集電体と、負極集電体の少なくとも一方面の上に設けられた分極性電極層とにより構成することができる。 The configuration of the negative electrode 32 can be appropriately determined depending on the type of the electricity storage device 1. For example, when the electricity storage device 1 is a secondary battery, the negative electrode 32 can be constituted by a negative electrode current collector and an active material layer provided on at least one surface of the negative electrode current collector. For example, when the electricity storage device 1 is an electric double layer capacitor, the negative electrode 32 can be constituted by a negative electrode current collector and a polarizable electrode layer provided on at least one surface of the negative electrode current collector. it can.
　セパレータ３３は、例えば、電解質中のイオンが移動可能な連続孔を有する多孔質シートにより構成することができる。セパレータ３３は、例えば、ポリプロピレン、ポリエチレン、ポリイミド、セルロース、アラミド、ポリフッ化ビニリデン、テフロン（登録商標）等により構成されていてもよい。また、セパレータ３３の表面がセラミックコート層や接着層等により覆われていてもよい。セパレータ３３の表面が接着性を有していてもよい。また、セパレータ３３は１種の材料からなる単層膜であってもよく、１種または２種類以上の材料からなる複合膜または多層膜であってもよい。 The separator 33 can be constituted by, for example, a porous sheet having continuous holes through which ions in the electrolyte can move. The separator 33 may be made of, for example, polypropylene, polyethylene, polyimide, cellulose, aramid, polyvinylidene fluoride, Teflon (registered trademark), or the like. The surface of the separator 33 may be covered with a ceramic coat layer, an adhesive layer, or the like. The surface of the separator 33 may have adhesiveness. The separator 33 may be a single layer film made of one material, or a composite film or a multilayer film made of one kind or two or more kinds of materials.
　正極３１、負極３２及びセパレータ３３のうち、正極３１が最も小さい。平面視した際に、長さ方向Ｌにおいて正極（第１の電極）３１の全体が負極（第２の電極）３２の上に位置している。平面視した際に、負極３２は、長さ方向Ｌの両側において、正極３１よりも外側にまで延びており、負極３２は、幅方向Ｗの両側において、正極３１よりも外側にまで延びている。 Among the positive electrode 31, the negative electrode 32, and the separator 33, the positive electrode 31 is the smallest. When viewed in a plan view, the entire positive electrode (first electrode) 31 is located on the negative electrode (second electrode) 32 in the length direction L. When viewed in plan, the negative electrode 32 extends to the outside of the positive electrode 31 on both sides in the length direction L, and the negative electrode 32 extends to the outside of the positive electrode 31 on both sides in the width direction W. .
　蓄電デバイス１では、正極３１、セパレータ３３、負極３２及びセパレータ３３が、この順番で複数回積層されている。この複数の正極３１、複数のセパレータ３３及び複数の負極３２の積層体７０及び絶縁性テープ５により、電極体３が構成されている。 In the electricity storage device 1, the positive electrode 31, the separator 33, the negative electrode 32, and the separator 33 are laminated a plurality of times in this order. The electrode body 3 is constituted by the laminated body 70 and the insulating tape 5 of the plurality of positive electrodes 31, the plurality of separators 33, and the plurality of negative electrodes 32.
　電極体３は、絶縁性テープ５により一体化されている。詳細には、絶縁性テープ５は、正極３１、負極３２及びセパレータ３３の積層体７０の側面を覆うように設けられており、積層体７０を一体化している。具体的には、本実施形態では、絶縁性テープ５は、第１の絶縁性テープ５１と、第２の絶縁性テープ５２とを有する。第１の絶縁性テープ５１は、積層体７０のＷ１側に設けられている。第１の絶縁性テープ５１は、積層体７０の幅方向Ｗにおける一方側（Ｗ１側）側面を経由して、積層体７０の第１の主面７０ａと、第２の主面７０ｂとに跨がって設けられている。第１の絶縁性テープ５１と第１の主面７０ａとが接合されており、かつ、第１の絶縁性テープ５１と第２の主面７０ｂとが接合されていることにより、第１の端部３３ｅ１の少なくとも先端部が積層方向Ｔの一方側（Ｔ１側）に向かって屈曲した状態となるように、第１の端部３３ｅ１の少なくとも先端部を保持している。 The electrode body 3 is integrated by an insulating tape 5. Specifically, the insulating tape 5 is provided so as to cover the side surface of the laminate 70 of the positive electrode 31, the negative electrode 32, and the separator 33, and the laminate 70 is integrated. Specifically, in the present embodiment, the insulating tape 5 includes a first insulating tape 51 and a second insulating tape 52. The first insulating tape 51 is provided on the W1 side of the laminated body 70. The first insulating tape 51 straddles the first main surface 70a and the second main surface 70b of the multilayer body 70 via one side (W1 side) side surface in the width direction W of the multilayer body 70. It is provided. The first insulating tape 51 and the first main surface 70a are joined, and the first insulating tape 51 and the second main surface 70b are joined, so that the first end is obtained. At least the distal end portion of the first end portion 33e1 is held so that at least the distal end portion of the portion 33e1 is bent toward one side (T1 side) in the stacking direction T.
　第２の絶縁性テープ５２は、積層体７０のＷ２側に設けられている。第２の絶縁性テープ５２は、積層体７０の幅方向Ｗにおける他方側（Ｗ２側）側面を経由して、積層体７０の第１の主面７０ａと、第２の主面７０ｂとに跨がって設けられている。第２の絶縁性テープ５２と第１の主面７０ａとが接合されており、かつ、第２の絶縁性テープ５２と第２の主面７０ｂとが接合されていることにより、第２の端部３３ｅ２の少なくとも先端部が積層方向Ｔの一方側（Ｔ１側）に向かって屈曲した状態となるように、第２の端部３３ｅ２の少なくとも先端部を保持している。 The second insulating tape 52 is provided on the W2 side of the laminated body 70. The second insulating tape 52 straddles the first main surface 70a and the second main surface 70b of the multilayer body 70 via the other side (W2 side) side surface in the width direction W of the multilayer body 70. It is provided. Since the second insulating tape 52 and the first main surface 70a are joined, and the second insulating tape 52 and the second main surface 70b are joined, the second end is obtained. At least the distal end portion of the second end portion 33e2 is held so that at least the distal end portion of the portion 33e2 is bent toward one side (T1 side) in the stacking direction T.
　なお、絶縁性テープ５１，５２と積層体７０との接合方法は、特に限定されない。例えば、絶縁性テープ５１，５２と積層体７０とを直接接合してもよいし、粘接着剤をもちいて粘接着させることにより接合してもよい。絶縁性テープ５１，５２を粘接着テープにより構成して、絶縁性テープ５１，５２を積層体７０に接着してもよい。絶縁性テープ５１，５２を両面粘接着テープにより構成して、絶縁性テープ５１，５２を積層体７０に接着すると共に、絶縁性テープ５１，５２により積層体７０とケース２とを接着することにより固定してもよい。そうすることにより、ケース２内において積層体７０が変位することが効果的に抑制される。また、絶縁性テープ５１，５２と積層体７０とを、絶縁性テープ５１，５２とは別の粘接着テープを用いて固定してもよい。 In addition, the joining method of the insulating tapes 51 and 52 and the laminated body 70 is not specifically limited. For example, the insulating tapes 51 and 52 and the laminated body 70 may be directly bonded, or may be bonded by using an adhesive to be adhesively bonded. The insulating tapes 51 and 52 may be formed of an adhesive tape, and the insulating tapes 51 and 52 may be bonded to the laminate 70. The insulating tapes 51 and 52 are constituted by double-sided adhesive tape, and the insulating tapes 51 and 52 are bonded to the laminate 70, and the laminate 70 and the case 2 are bonded by the insulating tapes 51 and 52. It may be fixed by. By doing so, the displacement of the stacked body 70 in the case 2 is effectively suppressed. Moreover, you may fix the insulating tapes 51 and 52 and the laminated body 70 using the adhesive tape different from the insulating tapes 51 and 52. FIG.
　ここで、「粘接着」には、「粘着」と「接着」とが含まれるものとする。従って、粘接着剤には、粘着材と、接着剤が含まれる。粘接着テープには、粘着テープと接着テープとが含まれる。 Here, “adhesion” includes “adhesion” and “adhesion”. Accordingly, the adhesive includes an adhesive and an adhesive. The adhesive tape includes an adhesive tape and an adhesive tape.
　なお、絶縁性テープ５は、例えば、ポリイミド、ポリプロピレン、アクリル等の樹脂テープ、アルミ箔、銅箔、ステンレス箔、ニッケル箔等の金属箔の表面を絶縁層によりコーティングしたもの等により構成することができる。 The insulating tape 5 may be composed of, for example, a resin tape made of polyimide, polypropylene, acrylic, etc., or a metal foil such as aluminum foil, copper foil, stainless steel foil, or nickel foil coated with an insulating layer. it can.
　電極体３とケース２とは、接合されている。具体的には、電極体３は、接着層６によりケース２の内面に接着されて固定されている。これにより、ケース２の内面と電極体３とが接触することが抑制されている。なお、図３において、電極体３はケース２に対して、図の上方側（Ｔ１側）に接合されているが、図の下方側に接合するようにしてもよい。 The electrode body 3 and the case 2 are joined. Specifically, the electrode body 3 is bonded and fixed to the inner surface of the case 2 with an adhesive layer 6. Thereby, it is suppressed that the inner surface of case 2 and the electrode body 3 contact. In FIG. 3, the electrode body 3 is bonded to the case 2 on the upper side (T1 side) in the figure, but may be bonded to the lower side in the figure.
　図４に示すように、蓄電デバイス１は、正極端子４１と、負極端子４２とを有する。なお、本実施形態では、正極端子４１が「第１の電極端子」を構成しており、負極端子４２が「第２の電極端子」を構成している。 As shown in FIG. 4, the electricity storage device 1 has a positive electrode terminal 41 and a negative electrode terminal 42. In the present embodiment, the positive terminal 41 constitutes a “first electrode terminal”, and the negative terminal 42 constitutes a “second electrode terminal”.
　正極端子４１と負極端子４２とは、それぞれ、ケース２の長さ方向Ｌの一方側に位置する端面２ａに設けられている。 The positive electrode terminal 41 and the negative electrode terminal 42 are respectively provided on the end surface 2 a located on one side in the length direction L of the case 2.
　図４に示すように、正極端子４１は、正極３１に電気的に接続されている。具体的には、正極３１と正極端子４１とは、第１の接続部材６１により電気的に接続されている。第１の接続部材６１の一方側部分は、正極３１から延びる正極引き出し部３１ａに接続されており、他方側部分は、正極端子４１に接続されている。 As shown in FIG. 4, the positive terminal 41 is electrically connected to the positive electrode 31. Specifically, the positive electrode 31 and the positive electrode terminal 41 are electrically connected by the first connection member 61. One side portion of the first connection member 61 is connected to the positive electrode lead portion 31 a extending from the positive electrode 31, and the other side portion is connected to the positive electrode terminal 41.
　負極端子４２は、負極３２に電気的に接続されている。具体的には、負極３２と負極端子４２とは、第２の接続部材６２により電気的に接続されている。第２の接続部材６２の一方側部分は、負極３２から延びる負極引き出し部３２ａに接続されており、他方側部分は、負極端子４２に接続されている。 The negative electrode terminal 42 is electrically connected to the negative electrode 32. Specifically, the negative electrode 32 and the negative electrode terminal 42 are electrically connected by the second connection member 62. One side portion of the second connection member 62 is connected to the negative electrode lead portion 32 a extending from the negative electrode 32, and the other side portion is connected to the negative electrode terminal 42.
　セパレータ３３は、電解質４を含浸している。電極体３は、電解質４を含浸している。電解質４は、例えば、電解液であってもよい。電解質３は、蓄電デバイス１の種類や、蓄電デバイス１に求められる特性、正極３１の材料、負極３２の材料等に応じて、適宜決定することができる。 The separator 33 is impregnated with the electrolyte 4. The electrode body 3 is impregnated with the electrolyte 4. The electrolyte 4 may be, for example, an electrolytic solution. The electrolyte 3 can be appropriately determined according to the type of the electricity storage device 1, the characteristics required for the electricity storage device 1, the material of the positive electrode 31, the material of the negative electrode 32, and the like.
　ところで、蓄電デバイス１においては、図１に示すように、端面２ａに正極端子４１及び負極端子４２が設けられている。このため、積層体７０（図３を参照）は、長さ方向Ｌに変位しにくい。積層体７０は、長さ方向Ｌに対して垂直な幅方向Ｗに変位しやすい。従って、積層体７０の側面と金属製のケース２とが接触して短絡不良が生じやすい。これに鑑みれば、積層体７０の側面の全体を絶縁性テープ５で覆うことが好ましいと考えられる。 By the way, in the electrical storage device 1, as shown in FIG. 1, the positive electrode terminal 41 and the negative electrode terminal 42 are provided in the end surface 2a. For this reason, the stacked body 70 (see FIG. 3) is not easily displaced in the length direction L. The stacked body 70 is easily displaced in the width direction W perpendicular to the length direction L. Therefore, the side surface of the laminated body 70 and the metal case 2 are in contact with each other, and short circuit failure is likely to occur. In view of this, it is considered preferable to cover the entire side surface of the laminate 70 with the insulating tape 5.
　しかしながら、本発明者らは、鋭意研究した結果、積層体の側面の全体を絶縁性テープで覆った場合、蓄電デバイスの充放電サイクル特性が低くなることを見出した。本発明者らは、さらに鋭意研究した結果、その原因が、充放電の際において、電解質が十分に流動しないため、蓄電デバイスの充放電サイクル特性が低くなっていることを見出し、その結果、本発明を成すに至った。 However, as a result of intensive studies, the present inventors have found that when the entire side surface of the laminate is covered with an insulating tape, the charge / discharge cycle characteristics of the electricity storage device are lowered. As a result of further diligent research, the present inventors have found that the cause is that the electrolyte does not flow sufficiently during charging and discharging, so that the charge / discharge cycle characteristics of the electricity storage device are low. Invented the invention.
　蓄電デバイス１では、絶縁性テープ５が、正極３１の側面の長さ方向Ｌにおける全体が絶縁性テープにより覆われるように設けられている。このため、正極３１が金属製のケース２と接触することが抑制されている。従って、蓄電デバイス１では、短絡不良が生じ難い。 In the electricity storage device 1, the insulating tape 5 is provided so that the entire side surface of the positive electrode 31 in the length direction L is covered with the insulating tape. For this reason, it is suppressed that the positive electrode 31 contacts the metal case 2. Therefore, the electrical storage device 1 is unlikely to cause a short circuit failure.
　また、蓄電デバイス１では、絶縁性テープ５は、負極３２の側面の長さ方向Ｌにおける一部が絶縁性テープ５から露出するように設けられている。このため、充放電の際において、電解質４が流動しやすい。従って、蓄電デバイス１は、優れた充放電サイクル特性を有する。 In the electricity storage device 1, the insulating tape 5 is provided such that a part of the side surface of the negative electrode 32 in the length direction L is exposed from the insulating tape 5. For this reason, the electrolyte 4 tends to flow during charging and discharging. Therefore, the electricity storage device 1 has excellent charge / discharge cycle characteristics.
　すなわち、本実施形態に係る蓄電デバイス１では、絶縁性テープ５が、正極３１の側面の長さ方向Ｌにおける全体が絶縁性テープにより覆われ、負極３２の側面の長さ方向Ｌにおける一部が絶縁性テープ５から露出するように設けられている。このため、蓄電デバイス１は、優れた充放電サイクル特性を有しており、かつ、蓄電デバイス１では短絡不良が生じ難い。また、ケースの内面に絶縁処理等をする必要がないため、蓄電デバイス１は、簡単な構造を有しており、かつ、製造が容易である。 That is, in the electricity storage device 1 according to the present embodiment, the insulating tape 5 is entirely covered with the insulating tape in the length direction L of the side surface of the positive electrode 31, and part of the side surface of the negative electrode 32 in the length direction L is It is provided so as to be exposed from the insulating tape 5. For this reason, the electrical storage device 1 has excellent charge / discharge cycle characteristics, and the electrical storage device 1 is unlikely to cause a short circuit failure. Moreover, since it is not necessary to insulate the inner surface of the case, the electricity storage device 1 has a simple structure and is easy to manufacture.
　蓄電デバイス１では、ケース２と電極体３とを接着している接着層６が設けられている。このため、電極体３がケース２に対して相対的に変位することがより効果的に抑制されている。従って、蓄電デバイス１では、短絡不良がより生じ難い。 In the electricity storage device 1, an adhesive layer 6 that bonds the case 2 and the electrode body 3 is provided. For this reason, it is more effectively suppressed that the electrode body 3 is displaced relative to the case 2. Therefore, in the electricity storage device 1, a short circuit failure is less likely to occur.
　特に、蓄電デバイス１では、接着層６が電極体３の主面とケース２の主壁の内面とを接着している。従って、電極体３がケース２に対して相対的に変位することがさらに効果的に抑制されている。従って、蓄電デバイス１では、短絡不良がさらに生じ難い。 In particular, in the electricity storage device 1, the adhesive layer 6 bonds the main surface of the electrode body 3 and the inner surface of the main wall of the case 2. Therefore, displacement of the electrode body 3 relative to the case 2 is further effectively suppressed. Therefore, in the electricity storage device 1, a short circuit failure is less likely to occur.
　以下、本発明の好ましい実施形態の他の例について説明する。以下の説明において、上記第１の実施形態と実質的に共通の機能を有する部材を共通の符号で参照し、説明を省略する。 Hereinafter, another example of the preferred embodiment of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and description thereof is omitted.
　（第２の実施形態）
　図５は、第２の実施形態に係る蓄電デバイス１ａの模式的断面図である。 (Second Embodiment)
FIG. 5 is a schematic cross-sectional view of an electricity storage device 1a according to the second embodiment.
　第１の実施形態では、絶縁性テープ５が第１の絶縁性テープ５１と第２の絶縁性テープ５２との複数のテープにより構成されている例について説明した。但し、本発明は、この構成に限定されない。本発明において、テープは、一体に設けられていてもよい。例えば、第１の絶縁性テープ５１と第２の絶縁性テープ５２とが、積層体７０の第２の主面７０ｂ上において接続されていてもよい。この場合、蓄電デバイス１を構成する部品点数を少なくすることができる。また、絶縁性テープ５を積層体７０に強固に固定することができる。 In the first embodiment, the example in which the insulating tape 5 is composed of a plurality of tapes of the first insulating tape 51 and the second insulating tape 52 has been described. However, the present invention is not limited to this configuration. In the present invention, the tape may be provided integrally. For example, the first insulating tape 51 and the second insulating tape 52 may be connected on the second main surface 70 b of the laminate 70. In this case, the number of parts constituting the power storage device 1 can be reduced. Further, the insulating tape 5 can be firmly fixed to the laminated body 70.
　（第３の実施形態）
　図６は、第３の実施形態に係る蓄電デバイス１ｂの模式的断面図である。 (Third embodiment)
FIG. 6 is a schematic cross-sectional view of an electricity storage device 1b according to the third embodiment.
　図６に示すように、本発明においては、絶縁性テープ５が積層体７０を巻回していてもよい。 As shown in FIG. 6, in the present invention, the insulating tape 5 may wind the laminate 70.
　（第４の実施形態）
　図７は、第４の実施形態に係る蓄電デバイスの模式的断面図である。 (Fourth embodiment)
FIG. 7 is a schematic cross-sectional view of the electricity storage device according to the fourth embodiment.
　第１～第３の実施形態では、正極３１を介して積層方向Ｔにおいて隣接するセパレータ３３が袋状セパレータ３３ａを構成している例について説明した。但し、本発明は、この構成に限定されない。例えば、図７のように複数のシート状のセパレータ３３が別個に設けられていてもよい。また、セパレータ３３は、例えば正極３１の両面に接続される状態でもよい。セパレータ３３は、折り返しながら正極３１と負極３２の間に配置される九十九折状でもよい。 In the first to third embodiments, the example in which the separator 33 adjacent in the stacking direction T via the positive electrode 31 constitutes the bag-shaped separator 33a has been described. However, the present invention is not limited to this configuration. For example, a plurality of sheet-like separators 33 may be separately provided as shown in FIG. The separator 33 may be connected to both surfaces of the positive electrode 31, for example. The separator 33 may have a ninety-nine fold shape arranged between the positive electrode 31 and the negative electrode 32 while being folded.
１，１ａ，１ｂ　蓄電デバイス
２　ケース
２ａ　ケースの端面
３　電極体
４　電解質
５　絶縁性テープ
６　接着層
３１　正極
３１ａ　正極引き出し部
３２　負極
３２ａ　負極引き出し部
３３　セパレータ
３３ａ　袋状セパレータ
３３ｅ１　第１の端部
３３ｅ２　第２の端部
４１　正極端子
４２　負極端子
５１　第１の絶縁性テープ
５２　第２の絶縁性テープ
６１　第１の接続部材
６２　第２の接続部材
７０　積層体
７０ａ　積層体の第１の主面
７０ｂ　積層体の第２の主面 1, 1a, 1b Power storage device 2 Case 2a Case end surface 3 Electrode body 4 Electrolyte 5 Insulating tape 6 Adhesive layer 31 Positive electrode 31a Positive electrode lead portion 32 Negative electrode 32a Negative electrode lead portion 33 Separator 33a Bag-like separator 33e1 First end portion 33e2 Second end 41 Positive electrode terminal 42 Negative electrode terminal 51 First insulating tape 52 Second insulating tape 61 First connecting member 62 Second connecting member 70 Laminated body 70a First main surface 70b of the laminated body Second main surface of the laminate

Claims (4)

  1. 　直方体状の金属製ケースと、
    　前記ケース内に配されており、矩形状の第１の電極と、矩形状の第２の電極と、前記第１の電極と前記第２の電極との間に配されたセパレータとを有する電極体と、
    　前記セパレータに含浸された電解質と、
    　前記ケースの長さ方向の一方側に位置する端面に設けられており、前記第１の電極と電気的に接続された第１の電極端子と、
    　前記ケースの長さ方向の一方側に位置する端面に設けられており、前記第２の電極と電気的に接続された第２の電極端子と、
    　を備え、
    　平面視した際に、長さ方向において、前記第１の電極の全体が前記第２の電極の上に位置しており、
    　前記電極体は、前記第１の電極、前記第２の電極及び前記セパレータの側面を覆うように設けられており、前記第１の電極、前記第２の電極及び前記セパレータを一体化している絶縁性テープをさらに有し、
    　前記絶縁性テープは、前記第１の電極の側面の長さ方向における全体が前記絶縁性テープにより覆われている、蓄電デバイス。     A rectangular metal case,
    An electrode disposed in the case and having a rectangular first electrode, a rectangular second electrode, and a separator disposed between the first electrode and the second electrode Body,
    An electrolyte impregnated in the separator;
    A first electrode terminal provided on an end face located on one side in the length direction of the case, and electrically connected to the first electrode;
    A second electrode terminal provided on an end face located on one side in the length direction of the case, and electrically connected to the second electrode;
    With
    When viewed in plan, the entire first electrode is positioned on the second electrode in the length direction;
    The electrode body is provided so as to cover side surfaces of the first electrode, the second electrode, and the separator, and the first electrode, the second electrode, and the separator are integrated with each other. And further having an adhesive tape,
    The electrical storage device, wherein the insulating tape is entirely covered with the insulating tape in the length direction of the side surface of the first electrode.
  2. 　前記ケースと前記電極体とを接着している接着層をさらに備える、請求項１に記載の蓄電デバイス。 The electrical storage device according to claim 1, further comprising an adhesive layer that adheres the case and the electrode body.
  3. 　前記第１の電極と前記第１の電極端子とを接続している第１の接続部材と、
    　前記第２の電極と前記第２の電極端子とを接続している第２の接続部材と、
    　をさらに備える、請求項１又は２に記載の蓄電デバイス。     A first connecting member connecting the first electrode and the first electrode terminal;
    A second connecting member connecting the second electrode and the second electrode terminal;
    The electricity storage device according to claim 1, further comprising:
  4. 　前記第１の電極が正極を構成しており、
    　前記第２の電極が負極を構成している、請求項１～３のいずれか一項に記載の蓄電デバイス。     The first electrode constitutes a positive electrode;
    The electricity storage device according to any one of claims 1 to 3, wherein the second electrode forms a negative electrode.
PCT/JP2016/058038 2016-03-14 2016-03-14 Electrical storage device WO2017158702A1 (en)

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