JP2020149798A - Laminated battery and manufacturing method thereof - Google Patents
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- 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
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Abstract
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.
蓄電素子として、例えば特許文献１で提案されているように、正極と負極とを交互に積層してなる積層型電池や巻回型電池が広く普及している。このような積層型電池の一例として、リチウムイオン二次電池が挙げられる。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。 As a power storage element, for example, as proposed in Patent Document 1, a laminated battery or a wound battery in which positive electrodes and negative electrodes are alternately laminated is widely used. An example of such a laminated battery is a lithium ion secondary battery. One of the features of lithium-ion secondary batteries is that they have 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.
リチウムイオン二次電池に代表される積層型電池では、正極と負極とが積層方向に交互に積層された電極体が外装体内に収容されている。また、電極体を収容する外装体は、一般的に、金属層とシーラント層とを含む包装材から作製されている。そして、電極体から電力を取り出すため、正極および負極のうち電極活物質層が設けられていない領域において正極および負極がそれぞれ別個に集電しており、集電されたそれぞれの電極の電極集電体にタブが取り付けられている。 In a laminated battery represented by a lithium ion secondary battery, an electrode body in which positive electrodes and negative electrodes are alternately laminated in the stacking direction is housed inside the exterior. The exterior body that houses the electrode body is generally made of a packaging material that includes a metal layer and a sealant layer. Then, in order to extract power from the electrode body, the positive electrode and the negative electrode separately collect electricity in the region of the positive electrode and the negative electrode where the electrode active material layer is not provided, and the electrode current collection of each collected electrode is performed. Tabs are attached to the body.
ところで、積層型電池に用いられるタブは、切削加工等の機械加工により作製されることが一般的であり、タブの端面にバリが発生する場合がある。この場合、外装体がタブと接触した際に、バリが外装体のシーラント層を貫通して金属層まで到達してしまう可能性がある。そして、バリが金属層と接触して短絡すると、析出等の深刻な不具合が生じるおそれがある。 By the way, tabs used in laminated batteries are generally manufactured by machining such as cutting, and burrs may occur on the end faces of the tabs. In this case, when the exterior body comes into contact with the tab, burrs may penetrate the sealant layer of the exterior body and reach the metal layer. If the burr comes into contact with the metal layer and short-circuits, a serious problem such as precipitation may occur.
このため、外装体を構成する包装材に、シーラント層を保護するための保護テープを設ける場合がある。しかしながら、この場合、積層型電池の製造工程が増加し、コスト面での損失が大きくなることが懸念される。また、タブからバリを除去する場合においても、タブの製造コストが増加し、コスト面での損失が大きくなることが懸念される。 Therefore, a protective tape for protecting the sealant layer may be provided on the packaging material constituting the exterior body. However, in this case, there is a concern that the manufacturing process of the laminated battery will increase and the loss in terms of cost will increase. Further, even when the burr is removed from the tab, there is a concern that the manufacturing cost of the tab will increase and the cost loss will increase.
本発明はこのような点を考慮してなされたものであり、製造コストを低減することができるとともに、性能および信頼性に優れた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 an object of the present invention is to provide a laminated battery and a method for manufacturing a laminated battery, which can reduce the manufacturing cost and have excellent performance and reliability. And.
本発明の積層型電池は、
複数の第１電極と、
前記第１電極と積層方向に交互に積層された複数の第２電極と、
金属層および前記金属層に積層されたシーラント層を含む外装材を用いて形成され、前記第１電極および前記第２電極を収容する外装体と、
前記第１電極と電気的に接続するとともに、前記外装体の内部から外部へと延び出す第１タブと、
前記第２電極と電気的に接続するとともに、前記外装体の内部から外部へと延び出す第２タブと、を備え、
複数の前記第１電極は、前記積層方向において前記第１タブの端面と前記外装体との間に介在するとともに前記第１タブの前記積層方向における一側に位置し、前記外装体に接触する第１群の第１電極を含み、
前記第１群の第１電極の厚みと前記シーラント層の厚みとを合計した厚みは、前記第１タブの厚みの半分以上である、積層型電池である。
The laminated battery of the present invention
With multiple first electrodes,
A plurality of second electrodes laminated alternately with the first electrode in the stacking direction,
An exterior body formed by using a metal layer and an exterior material including a sealant layer laminated on the metal layer, and accommodating the first electrode and the second electrode.
A first tab that is electrically connected to the first electrode and extends from the inside to the outside of the exterior body,
It is provided with a second tab that is electrically connected to the second electrode and extends from the inside to the outside of the exterior body.
The plurality of first electrodes are interposed between the end face of the first tab and the exterior body in the stacking direction, and are located on one side of the first tab in the stacking direction and come into contact with the exterior body. Includes the first electrode of the first group,
The total thickness of the thickness of the first electrode of the first group and the thickness of the sealant layer is more than half the thickness of the first tab, which is a laminated battery.
本発明の積層型電池において、
複数の前記第１電極は、前記第１タブの前記積層方向における他側に位置する第２群の第１電極を更に含んでいてもよい。
In the laminated battery of the present invention
The plurality of first electrodes may further include the first electrode of the second group located on the other side of the first tab in the stacking direction.
本発明の積層型電池において、
前記第１群の第１電極は、３つ以上６つ以下の前記第１電極を含んでいてもよい。
In the laminated battery of the present invention
The first electrode of the first group may include three or more and six or less of the first electrodes.
本発明の積層型電池において、
複数の前記第２電極は、前記積層方向において前記第２タブの端面と前記外装体との間に介在するとともに前記第２タブの前記積層方向における一側に位置し、前記外装体に接触する第１群の第２電極を含み、
前記第１群の第２電極の厚みと前記シーラント層の厚みとを合計した厚みは、前記第２タブの厚みの半分以上であってもよい。
In the laminated battery of the present invention
The plurality of second electrodes are interposed between the end face of the second tab and the exterior body in the stacking direction, and are located on one side of the second tab in the stacking direction and come into contact with the exterior body. Includes the second electrode of the first group,
The total thickness of the thickness of the second electrode of the first group and the thickness of the sealant layer may be half or more of the thickness of the second tab.
本発明の積層型電池において、
複数の前記第２電極は、前記第２タブの前記積層方向における他側に位置する第２群の第２電極を更に含んでいてもよい。
In the laminated battery of the present invention
The plurality of second electrodes may further include a second group of second electrodes located on the other side of the second tab in the stacking direction.
本発明の積層型電池において、
前記第１群の第２電極は、４つ以上９つ以下の前記第２電極を含んでいてもよい。
In the laminated battery of the present invention
The second electrode of the first group may include four or more and nine or less of the second electrodes.
本発明の積層型電池において、
前記第１電極および前記第２電極を、それぞれ、１０以上含んでいてもよい。
In the laminated battery of the present invention
The first electrode and the second electrode may each include 10 or more.
本発明の積層型電池の製造方法は、
複数の第１電極と、複数の第２電極とを積層方向に交互に積層する工程と、
複数の前記第１電極を第１タブ上に重ねて配置する工程と、
複数の前記第１電極を前記第１タブに接合する工程と、
複数の前記第１電極および複数の前記第２電極を、金属層および前記金属層に積層されたシーラント層を含む外装材を用いて形成された外装体内に収容する工程と、を備え、
前記複数の前記第１電極を第１タブ上に重ねて配置する工程において、複数の前記第１電極のうちの第１群の第１電極を、前記第１群の第１電極の厚みと前記シーラント層の厚みとを合計した厚みが、前記第１タブの厚みの半分以上となるように、前記第１タブの前記積層方向における一側に配置し、
前記第１群の第１電極は、前記積層方向において前記第１タブの端面と前記外装体との間に介在するとともに、前記外装体に接触する、積層型電池の製造方法である。
The method for manufacturing a laminated battery of the present invention is
A step of alternately laminating a plurality of first electrodes and a plurality of second electrodes in the laminating direction,
A step of arranging a plurality of the first electrodes on top of each other on the first tab,
A step of joining a plurality of the first electrodes to the first tab, and
A step of accommodating the plurality of the first electrodes and the plurality of the second electrodes in an exterior body formed by using an exterior material including a metal layer and a sealant layer laminated on the metal layer.
In the step of superimposing the plurality of first electrodes on the first tab, the first electrode of the first group among the plurality of first electrodes is set to the thickness of the first electrode of the first group and the said. The first tab is arranged on one side in the stacking direction so that the total thickness of the sealant layer is at least half the thickness of the first tab.
The first electrode of the first group is a method for manufacturing a laminated battery, which is interposed between the end face of the first tab and the exterior body in the stacking direction and is in contact with the exterior body.
本発明の積層型電池の製造方法において、
前記複数の前記第１電極を第１タブ上に重ねて配置する工程において、複数の前記第１電極のうちの第２群の第１電極を、前記第１タブの前記積層方向における他側に配置してもよい。
In the method for manufacturing a laminated battery of the present invention,
In the step of superimposing the plurality of first electrodes on the first tab, the first electrode of the second group among the plurality of first electrodes is placed on the other side of the first tab in the stacking direction. It may be arranged.
本発明の積層型電池の製造方法において、
複数の前記第２電極を第２タブ上に重ねて配置する工程と、
複数の前記第２電極を前記第２タブに接合する工程と、を更に備え、
前記複数の前記第２電極を第２タブ上に重ねて配置する工程において、複数の前記第２電極のうちの第１群の第２電極を、前記第１群の第２電極の厚みと前記シーラント層の厚みとを合計した厚みが、前記第２タブの厚みの半分以上となるように、前記第２タブの前記積層方向における一側に配置し、
前記第１群の第２電極は、前記積層方向において前記第２タブの端面と前記外装体との間に介在するとともに、前記外装体に接触してもよい。
In the method for manufacturing a laminated battery of the present invention,
A step of arranging a plurality of the second electrodes on top of each other on the second tab,
A step of joining the plurality of the second electrodes to the second tab is further provided.
In the step of superimposing the plurality of the second electrodes on the second tab, the second electrode of the first group among the plurality of the second electrodes is set to the thickness of the second electrode of the first group and the said. The second tab is arranged on one side in the stacking direction so that the total thickness of the sealant layer is at least half the thickness of the second tab.
The second electrode of the first group may be interposed between the end face of the second tab and the exterior body in the stacking direction and may come into contact with the exterior body.
本発明の積層型電池の製造方法において、
前記複数の前記第２電極を第２タブ上に重ねて配置する工程において、複数の前記第２電極のうちの第２群の第２電極を、前記第２タブの前記積層方向における他側に配置してもよい。
In the method for manufacturing a laminated battery of the present invention,
In the step of superimposing the plurality of the second electrodes on the second tab, the second electrode of the second group among the plurality of the second electrodes is placed on the other side of the second tab in the stacking direction. It may be arranged.
本発明によれば、積層型電池の製造コストを低減することができるとともに、性能および信頼性を向上させることができる。 According to the present invention, the manufacturing cost of the laminated battery can be reduced, and the performance and reliability can be improved.
以下、図面を参照して本発明の一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, an embodiment 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.
なお、本明細書において、「板」、「シート」、「フィルム」の用語は、呼称の違いのみに基づいて、互いから区別されるものではない。 In addition, in this specification, the terms "board", "sheet", and "film" are not distinguished from each other based only on the difference in designation.
また、本明細書において用いる、形状や幾何学的条件ならびにそれらの程度を特定する、例えば、「平行」、「直交」、「同一」等の用語や長さや角度の値等については、厳密な意味に縛られることなく、同様の機能を期待し得る程度の範囲を含めて解釈することとする。 In addition, as used in this specification, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle, etc., which specify the shape and geometric conditions and their degrees, are strictly defined. Without being bound by the meaning, we will interpret it including the range where similar functions can be expected.
図１乃至図１０は、本発明による積層型電池およびその製造方法の一実施の形態を説明するための図である。 1 to 10 are diagrams for explaining an embodiment of a laminated battery and a method for manufacturing the same according to the present invention.
以下に説明する一実施の形態において、積層型電池１は、外装体７と、外装体７によって形成された収容空間７ａ内に収容された電極体５と、電極体５に接続されて外装体７の内部から外部へと延び出したタブ６ａ、６ｂと、を備えている。このうち電極体５は、第１電極１０と、第１電極１０と第１方向（積層方向）ｄ１に交互に積層された第２電極２０とを備えている。電極体５は、第１電極１０および第２電極２０を、それぞれ複数備えている。図１に示された例において、積層型電池１は、全体的に厚さ方向である第１方向ｄ１が薄い偏平形状を有しており、長手方向となる第２方向ｄ２と短手方向（幅方向）となる第３方向ｄ３とに広がっている。第１方向ｄ１、第２方向ｄ２および第３方向ｄ３は、互いに非平行であり、図示された例では、第１方向ｄ１、第２方向ｄ２および第３方向ｄ３は、互いに直交している。 In one embodiment described below, the laminated battery 1 is connected to the exterior body 7, the electrode body 5 housed in the accommodation space 7a formed by the exterior body 7, and the exterior body 5. The tabs 6a and 6b extending from the inside of the 7 to the outside are provided. Of these, the electrode body 5 includes a first electrode 10 and a second electrode 20 in which the first electrode 10 and the second electrode 20 are alternately laminated in the first direction (stacking direction) d1. The electrode body 5 includes a plurality of first electrodes 10 and a plurality of second electrodes 20, respectively. In the example shown in FIG. 1, the laminated battery 1 has a flat shape in which the first direction d1 which is the thickness direction is thin as a whole, and the second direction d2 which is the longitudinal direction and the lateral direction (d). It extends in the third direction d3, which is the width direction). The first direction d1, the second direction d2 and the third direction d3 are non-parallel to each other, and in the illustrated example, the first direction d1, the second direction d2 and the third direction d3 are orthogonal to each other.
以下において、積層型電池１がリチウムイオン二次電池である例について説明する。この例において、第１電極１０は正極１０Ｘを構成し、第２電極２０は負極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、ここで説明する一実施の形態は、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１０および第２電極２０を第１方向ｄ１に交互に積層してなる積層型電池に広く適用され得る。 Hereinafter, an example in which the laminated battery 1 is a lithium ion secondary battery will be described. In this example, the first electrode 10 constitutes the positive electrode 10X, and the second electrode 20 constitutes the negative electrode 20Y. However, as can be understood from the description of the action and effect described below, one embodiment described here is not limited to the lithium ion secondary battery, and the first electrode 10 and the second electrode 20 are used. It can be widely applied to a laminated battery formed by alternately stacking in the first direction d1.
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.
まず、電極体５について説明する。図２乃至図４に示すように、電極体５は、正極１０Ｘ（第１電極１０）と、負極２０Ｙ（第２電極２０）と、第１方向ｄ１に隣り合う正極１０Ｘおよび負極２０Ｙの間に配置された絶縁シート３０（図３および図４参照）と、を備えている。図２に示すように、正極１０Ｘおよび負極２０Ｙは、第１方向ｄ１に沿って交互に積層されている。電極体５は、正極１０Ｘおよび負極２０Ｙを、それぞれ１０以上含んでいる。電極体５の厚さ、すなわち第１方向ｄ１に沿った長さは、例えば４ｍｍ以上２０ｍｍ以下である。 First, the electrode body 5 will be described. As shown in FIGS. 2 to 4, the electrode body 5 is formed between the positive electrode 10X (first electrode 10), the negative electrode 20Y (second electrode 20), and the positive electrode 10X and the negative electrode 20Y adjacent to each other in the first direction d1. It includes an arranged insulating sheet 30 (see FIGS. 3 and 4). As shown in FIG. 2, the positive electrode 10X and the negative electrode 20Y are alternately laminated along the first direction d1. The electrode body 5 contains 10 or more positive electrodes 10X and 10 or more negative electrodes 20Y, respectively. The thickness of the electrode body 5, that is, the length along the first direction d1, is, for example, 4 mm or more and 20 mm or less.
図２および図３に示す非限定的な例において、正極１０Ｘおよび負極２０Ｙは、略長方形形状の外輪郭を有している板状の電極である。第１方向ｄ１に非平行な第２方向ｄ２が、正極１０Ｘおよび負極２０Ｙの長手方向であり、第１方向ｄ１および第２方向ｄ２の両方向に非平行な第３方向ｄ３が、正極１０Ｘおよび負極２０Ｙの短手方向（幅方向）である。正極１０Ｘおよび負極２０Ｙは、第２方向ｄ２にずらして配置されている。より具体的には、複数の正極１０Ｘは、第２方向ｄ２における一側に寄って配置され、複数の負極２０Ｙは、第２方向ｄ２における他側に寄って配置されている。正極１０Ｘおよび負極２０Ｙは、第２方向ｄ２における中央において、第１方向ｄ１に重なり合っている。 In the non-limiting example shown in FIGS. 2 and 3, the positive electrode 10X and the negative electrode 20Y are plate-shaped electrodes having a substantially rectangular outer contour. The second direction d2, which is non-parallel to the first direction d1, is the longitudinal direction of the positive electrode 10X and the negative electrode 20Y, and the third direction d3, which is non-parallel to both the first direction d1 and the second direction d2, is the positive electrode 10X and the negative electrode. It is the short side direction (width direction) of 20Y. The positive electrode 10X and the negative electrode 20Y are arranged so as to be offset in the second direction d2. More specifically, the plurality of positive electrodes 10X are arranged closer to one side in the second direction d2, and the plurality of negative electrodes 20Y are arranged closer to the other side in the second direction d2. The positive electrode 10X and the negative electrode 20Y overlap with the first direction d1 at the center in the second direction d2.
図２および図３に示すように、負極２０Ｙ（第２電極２０）の第３方向ｄ３に沿った長さは、正極１０Ｘ（第１電極１０）の第３方向ｄ３に沿った長さよりも長くなっている。図示された例では、負極２０Ｙは、正極１０Ｘより、第３方向ｄ３の一側および他側に延び出ている。正極１０Ｘの厚さ、すなわち第１方向ｄ１の長さは、例えば５μｍ以上５０μｍ以下であり、一例として１５μｍであってもよい。また、負極２０Ｙの厚さ、すなわち第１方向ｄ１の長さは、例えば５μｍ以上５０μｍ以下であり、一例として１０μｍであってもよい。さらに、長手方向、すなわち第２方向ｄ２に沿った長さは、例えば２００ｍｍ以上９５０ｍｍ以下であってもよく、短手方向、すなわち第３方向ｄ３に沿った長さ（幅）は、例えば７０ｍｍ以上３５０ｍｍ以下であってもよい。 As shown in FIGS. 2 and 3, the length of the negative electrode 20Y (second electrode 20) along the third direction d3 is longer than the length of the positive electrode 10X (first electrode 10) along the third direction d3. It has become. In the illustrated example, the negative electrode 20Y extends from the positive electrode 10X to one side and the other side of the third direction d3. The thickness of the positive electrode 10X, that is, the length of the first direction d1, is, for example, 5 μm or more and 50 μm or less, and may be 15 μm as an example. Further, the thickness of the negative electrode 20Y, that is, the length of the first direction d1 is, for example, 5 μm or more and 50 μm or less, and may be 10 μm as an example. Further, the length in the longitudinal direction, that is, along the second direction d2 may be, for example, 200 mm or more and 950 mm or less, and the length (width) in the lateral direction, that is, along the third direction d3 is, for example, 70 mm or more. It may be 350 mm or less.
図４に示すように、正極１０Ｘ（第１電極１０）は、正極集電体１１Ｘ（第１電極集電体１１）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１２）と、を有している。リチウムイオン二次電池において、正極１０Ｘ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。 As shown in FIG. 4, the positive electrode 10X (first electrode 10) includes a positive electrode current collector 11X (first electrode current collector 11) and a positive electrode active material layer 12X (first electrode 10) provided on the positive electrode current collector 11X. It has one electrode active material layer 12) and. In the lithium ion secondary battery, the positive electrode 10X emits lithium ions when discharged and occludes lithium ions when charged.
正極集電体１１Ｘは、互いに対向する第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に積層されている。具体的には、正極集電体１１Ｘの第１面１１ａまたは第２面１１ｂが、電極体５のうちの第１方向ｄ１における最外面を形成する場合、正極集電体１１Ｘの当該面には正極活物質層１２Ｘが設けられない。この正極集電体１１Ｘの配置に関連した構成を除き、電極体５の複数の正極１０Ｘは、正極集電体１１Ｘの両側に設けられた一対の正極活物質層１２Ｘを有し、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 facing each other as main surfaces. The positive electrode active material layer 12X is laminated on at least one surface of the first surface 11a and the second surface 11b of the positive electrode current collector 11X. Specifically, when the first surface 11a or the second surface 11b of the positive electrode current collector 11X forms the outermost surface in the first direction d1 of the electrode body 5, the surface of the positive electrode current collector 11X is covered. The positive electrode active material layer 12X is not provided. Except for the configuration related to the arrangement of the positive electrode current collector 11X, the plurality of positive electrode bodies 10X of the electrode body 5 have a pair of positive electrode active material layers 12X provided on both sides of the positive electrode current collector 11X and are identical to each other. Can be configured.
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、バインダーとなる結着剤を含んでいる。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て固化させることで、作製され得る。正極活物質として、例えば、一般式ＬｉＭｘＯｙ（ただし、Ｍは金属であり、ｘおよびｙは金属Ｍと酸素Ｏの組成比である）で表される金属酸リチウム化合物が用いられる。金属酸リチウム化合物の具体例として、コバルト酸リチウム、ニッケル酸リチウム、マンガン酸リチウム等が例示され得る。導電助剤としては、アセチレンブラック等が用いられ得る。結着剤としては、ポリフッ化ビニリデン等が用いられ得る。 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. The positive electrode active material layer 12X contains, for example, a positive electrode active material, a conductive auxiliary agent, and a binder serving as a binder. The positive electrode active material layer 12X is produced by coating a positive electrode slurry formed by dispersing a positive electrode active material, a conductive auxiliary agent, and a binder in a solvent on a material forming the positive electrode current collector 11X and solidifying the positive electrode active material layer 12X. Can be done. As the positive electrode active material, for example, a lithium metallic acid compound represented by the general formula LiM x O y (where M is a metal and x and y are composition ratios of metal M and oxygen O) is used. Specific examples of the lithium metallic acid compound include lithium cobalt oxide, lithium nickel oxide, lithium manganate and the like. As the conductive auxiliary agent, acetylene black or the like can be used. As the binder, polyvinylidene fluoride or the like can be used.
図２乃至図４に示すように、正極集電体１１Ｘ（第１電極集電体１１）は、第１端部領域ａ１（接続領域）および第１電極領域ｂ１（有効領域）を有している。図４に示すように、正極活物質層１２Ｘ（第１電極活物質層１２）は、正極集電体１１Ｘの第１電極領域ｂ１のみに積層されている。第１端部領域ａ１および第１電極領域ｂ１は、第２方向ｄ２に沿って互いに隣接するように配列されている。第１端部領域ａ１は、第１電極領域ｂ１よりも第２方向ｄ２における一側に位置している。複数の正極集電体１１Ｘは、第１端部領域ａ１において、抵抗溶接や超音波溶接、テープによる貼着、融着等によってタブ（第１タブ）６ａに接合されている。図示された例では、複数の正極１０Ｘの第１端部領域ａ１が、タブ６ａ上に重ねられて、互いに電気的に接続している。一方、第１電極領域ｂ１は、負極２０Ｙの後述する負極活物質層２２Ｙに対面する領域内に広がっている。このような第１電極領域ｂ１の配置により、正極活物質層１２Ｘからのリチウムの析出を防止することができる。 As shown in FIGS. 2 to 4, the positive electrode current collector 11X (first electrode current collector 11) has a first end region a1 (connection region) and a first electrode region b1 (effective region). There is. As shown in FIG. 4, the positive electrode active material layer 12X (first electrode active material layer 12) is laminated only in the first electrode region b1 of the positive electrode current collector 11X. The first end region a1 and the first electrode region b1 are arranged so as to be adjacent to each other along the second direction d2. The first end region a1 is located on one side in the second direction d2 with respect to the first electrode region b1. The plurality of positive electrode current collectors 11X are bonded to the tab (first tab) 6a by resistance welding, ultrasonic welding, bonding with tape, fusion, etc. in the first end region a1. In the illustrated example, the first end regions a1 of the plurality of positive electrodes 10X are superposed on the tab 6a and electrically connected to each other. On the other hand, the first electrode region b1 extends within the region of the negative electrode 20Y facing the negative electrode active material layer 22Y, which will be described later. By such an arrangement of the first electrode region b1, it is possible to prevent the precipitation of lithium from the positive electrode active material layer 12X.
また、図４および図５に示すように、複数の正極１０Ｘ（第１電極１０）は、第１方向（積層方向）ｄ１においてタブ（第１タブ）６ａの端面６ｃ（図５参照）と外装体７との間に介在するとともにタブ６ａの第１方向ｄ１における一側に位置する第１群の正極１０Ｘａ（第１群の第１電極１０ａ）を含んでいる。また、複数の正極１０Ｘ（第１電極１０）は、タブ（第１タブ）６ａの第１方向（積層方向）ｄ１における他側に位置する第２群の正極１０Ｘｂ（第２群の第１電極１０ｂ）を含んでいる。このうち第１群の正極１０Ｘａは、外装体７に接触している。具体的には、第１群の正極１０Ｘａの正極１０Ｘのうち、第１方向ｄ１において最も一側に位置する正極１０Ｘが、外装体７に接触している。 Further, as shown in FIGS. 4 and 5, the plurality of positive electrodes 10X (first electrode 10) are the end face 6c (see FIG. 5) and the exterior of the tab (first tab) 6a in the first direction (stacking direction) d1. It includes a positive electrode 10Xa of the first group (first electrode 10a of the first group) located on one side of the tab 6a in the first direction d1 while being interposed between the body 7. Further, the plurality of positive electrodes 10X (first electrode 10) are located on the other side of the tab (first tab) 6a in the first direction (stacking direction) d1 of the second group positive electrode 10Xb (first electrode of the second group). 10b) is included. Of these, the positive electrode 10Xa of the first group is in contact with the exterior body 7. Specifically, of the positive electrodes 10X of the positive electrodes 10Xa of the first group, the positive electrode 10X located on the most one side in the first direction d1 is in contact with the exterior body 7.
また、第１群の正極１０Ｘａの厚み（すなわち、第１方向ｄ１の長さ）と、後述する第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みは、タブ６ａの厚みの半分以上になっている。これにより、図５に示すように、タブ６ａの端面６ｃにバリＢ１が発生していた場合であっても、バリＢ１が後述する第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。ここで、バリＢ１の厚み（すなわち、第１方向ｄ１の長さ）は、タブ６ａの厚みの半分程度の厚みとなる場合がある。このため、第１群の正極１０Ｘａの厚みと、後述する第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みが、タブ６ａの厚みの半分以上になっていることにより、バリＢ１が後述する第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。この場合、第１群の正極１０Ｘａの厚みと、後述する第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みは、例えば１２０μｍ以上であることが好ましい。 Further, the total thickness of the thickness of the positive electrode 10Xa of the first group (that is, the length of the first direction d1) and the thickness of the sealant layer 71b of the first exterior material 71 described later is more than half the thickness of the tab 6a. It has become. As a result, as shown in FIG. 5, even if the burr B1 is generated on the end surface 6c of the tab 6a, the burr B1 comes into contact with the metal layer 71a of the first exterior material 71, which will be described later. It can be suppressed. Here, the thickness of the burr B1 (that is, the length in the first direction d1) may be about half the thickness of the tab 6a. Therefore, the total thickness of the positive electrode 10Xa of the first group and the thickness of the sealant layer 71b of the first exterior material 71, which will be described later, is more than half the thickness of the tab 6a, so that the burr B1 is formed. It is possible to suppress a problem that the first exterior material 71, which will be described later, comes into contact with the metal layer 71a. In this case, the total thickness of the positive electrode 10Xa of the first group and the thickness of the sealant layer 71b of the first exterior material 71, which will be described later, is preferably 120 μm or more, for example.
さらに、第１群の正極１０Ｘａは、３つ以上６つ以下の正極１０Ｘを含んでいてもよい。第１群の正極１０Ｘａの正極１０Ｘが、３つ以上であることにより、第１群の正極１０Ｘａの厚みを厚くすることができ、タブ６ａの端面６ｃにバリＢ１が発生していた場合であっても、バリＢ１が後述する第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。また、第１群の正極１０Ｘａの正極１０Ｘが６つ以下であることにより、第１群の正極１０Ｘａを超音波接合によりタブ６ａに接合する際に、超音波接合に用いられるホーンの振動エネルギーを第１群の正極１０Ｘａの正極１０Ｘの全体に効率良く伝達することができ、正極１０Ｘとタブ６ａとの間の接合不良の発生を抑制することができる。 Further, the positive electrode 10Xa of the first group may include 3 or more and 6 or less positive electrodes 10X. By having three or more positive electrodes 10Xa of the positive electrodes 10Xa of the first group, the thickness of the positive electrodes 10Xa of the first group can be increased, and burrs B1 are generated on the end face 6c of the tab 6a. However, it is possible to prevent the burr B1 from coming into contact with the metal layer 71a of the first exterior material 71, which will be described later. Further, since the number of positive electrodes 10Xa of the positive electrode 10Xa of the first group is 6 or less, the vibration energy of the horn used for ultrasonic bonding when the positive electrode 10Xa of the first group is bonded to the tab 6a by ultrasonic bonding is obtained. It can be efficiently transmitted to the entire positive electrode 10X of the positive electrode 10Xa of the first group, and the occurrence of poor bonding between the positive electrode 10X and the tab 6a can be suppressed.
なお、図示された例では、第２群の正極１０Ｘｂが２つの正極１０Ｘを含んでいるが、これに限られるものではない。第２群の正極１０Ｘｂの正極１０Ｘの数は任意とすることができる。 In the illustrated example, the positive electrode 10Xb of the second group includes two positive electrodes 10X, but the present invention is not limited to this. The number of positive electrodes 10X in the positive electrode 10Xb of the second group can be arbitrary.
次に、負極２０Ｙ（第２電極２０）について説明する。負極２０Ｙ（第２電極２０）は、負極集電体２１Ｙ（第２電極集電体２１）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２２）と、を有している。リチウムイオン二次電池において、負極２０Ｙ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。 Next, the negative electrode 20Y (second electrode 20) will be described. The negative electrode 20Y (second electrode 20) includes a negative electrode current collector 21Y (second electrode current collector 21) and a negative electrode active material layer 22Y (second electrode active material layer 22) provided on the negative electrode current collector 21Y. And have. In the lithium ion secondary battery, the negative electrode 20Y occludes lithium ions during discharging and releases lithium ions during charging.
負極集電体２１Ｙは、互いに対向する第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に積層されている。電極体５の複数の負極２０Ｙは、負極集電体２１Ｙの両側に設けられた一対の負極活物質層２２Ｙを有し、互いに同一に構成され得る。 The negative electrode current collector 21Y has a first surface 21a and a second surface 21b facing each other as main surfaces. The negative electrode active material layer 22Y is laminated on at least one surface of the first surface 21a and the second surface 21b of the negative electrode current collector 21Y. The plurality of negative electrode bodies 20Y of the electrode body 5 have a pair of negative electrode active material layers 22Y provided on both sides of the negative electrode current collector 21Y, and may be configured to be identical to each other.
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、炭素材料からなる負極活物質、および、バインダーとして機能する結着剤を含んでいる。負極活物質層２２Ｙは、例えば、炭素粉末や黒鉛粉末等からなる負極活物質とポリフッ化ビニリデンのような結着剤と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て固化することで、作製され得る。 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 contains, for example, a negative electrode active material made of a carbon material and a binder that functions as a binder. The negative electrode active material layer 22Y forms a negative electrode current collector 21Y, for example, a slurry for a negative electrode formed by dispersing a negative electrode active material made of carbon powder, graphite powder, or the like and a binder such as polyvinylidene fluoride in a solvent. It can be produced by coating on a material and solidifying it.
図２乃至図４に示すように、負極集電体２１Ｙ（第２電極集電体２１）は、第２端部領域ａ２（接続領域）および第２電極領域ｂ２（有効領域）を有している。図４に示すように、負極活物質層２２Ｙ（第２電極活物質層２２）は、負極集電体２１Ｙの第２電極領域ｂ２のみに積層されている。第２端部領域ａ２および第２電極領域ｂ２は、第２方向ｄ２に沿って互いに隣接するように配列されている。第２端部領域ａ２は、第２電極領域ｂ２よりも第２方向ｄ２における他側に位置している。複数の負極集電体２１Ｙは、第２端部領域ａ２において、抵抗溶接や超音波溶接、テープによる貼着、融着等によってタブ（第２タブ）６ｂに接合されている。図示された例では、複数の負極２０Ｙの第２端部領域ａ２が、正極集電体１１Ｘが接合されたタブ６ａとは別のタブ６ｂ上に重ねられて、互いに電気的に接続している。一方、第２電極領域ｂ２は、正極１０Ｘの正極活物質層１２Ｘに対面する領域に広がっている。 As shown in FIGS. 2 to 4, the negative electrode current collector 21Y (second electrode current collector 21) has a second end region a2 (connection region) and a second electrode region b2 (effective region). There is. As shown in FIG. 4, the negative electrode active material layer 22Y (second electrode active material layer 22) is laminated only in the second electrode region b2 of the negative electrode current collector 21Y. The second end region a2 and the second electrode region b2 are arranged so as to be adjacent to each other along the second direction d2. The second end region a2 is located on the other side in the second direction d2 from the second electrode region b2. The plurality of negative electrode current collectors 21Y are bonded to the tab (second tab) 6b by resistance welding, ultrasonic welding, bonding with tape, fusion, etc. in the second end region a2. In the illustrated example, the second end regions a2 of the plurality of negative electrodes 20Y are superposed on a tab 6b different from the tab 6a to which the positive electrode current collector 11X is bonded, and are electrically connected to each other. .. On the other hand, the second electrode region b2 extends to a region of the positive electrode 10X facing the positive electrode active material layer 12X.
また、図４および図６に示すように、複数の負極２０Ｙ（第２電極２０）は、第１方向（積層方向）ｄ１においてタブ（第２タブ）６ｂの端面６ｄ（図６参照）と外装体７との間に介在するとともにタブ６ｂの第１方向ｄ１における一側に位置する第１群の負極２０Ｙａ（第１群の第２電極２０ａ）を含んでいる。また、複数の負極２０Ｙ（第２電極２０）は、タブ（第２タブ）６ｂの第１方向（積層方向）ｄ１における他側に位置する第２群の負極２０Ｙｂ（第２群の第２電極２０ｂ）を含んでいる。このうち第１群の負極２０Ｙａは、外装体７に接触している。具体的には、第１群の負極２０Ｙａの負極２０Ｙのうち、第１方向ｄ１において最も一側に位置する負極２０Ｙが、外装体７に接触している。 Further, as shown in FIGS. 4 and 6, the plurality of negative electrodes 20Y (second electrode 20) are the end face 6d (see FIG. 6) and the exterior of the tab (second tab) 6b in the first direction (stacking direction) d1. It includes the negative electrode 20Ya of the first group (second electrode 20a of the first group) located on one side in the first direction d1 of the tab 6b as well as being interposed between the body 7. Further, the plurality of negative electrodes 20Y (second electrode 20) are located on the other side of the tab (second tab) 6b in the first direction (stacking direction) d1 of the second group negative electrode 20Yb (second electrode of the second group). 20b) is included. Of these, the negative electrode 20Ya of the first group is in contact with the exterior body 7. Specifically, of the negative electrodes 20Y of the negative electrodes 20Ya of the first group, the negative electrode 20Y located on the most one side in the first direction d1 is in contact with the exterior body 7.
また、第１群の負極２０Ｙａの厚み（すなわち、第１方向ｄ１の長さ）と、後述する第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みは、タブ６ｂの厚みの半分以上になっている。これにより、図６に示すように、タブ６ｂの端面６ｄにバリＢ２が発生していた場合であっても、バリＢ２が後述する第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。ここで、バリＢ２の厚み（すなわち、第１方向ｄ１の長さ）は、タブ６ｂの厚みの半分程度の厚みとなる場合がある。このため、第１群の負極２０Ｙａの厚みと、後述する第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みが、タブ６ｂの厚みの半分以上になっていることにより、バリＢ２が後述する第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。この場合、第１群の負極２０Ｙａの厚みと、後述する第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みは、例えば１２０μｍ以上であることが好ましい。 Further, the total thickness of the thickness of the negative electrode 20Ya of the first group (that is, the length of the first direction d1) and the thickness of the sealant layer 71b of the first exterior material 71 described later is more than half the thickness of the tab 6b. It has become. As a result, as shown in FIG. 6, even if the burr B2 is generated on the end surface 6d of the tab 6b, the burr B2 comes into contact with the metal layer 71a of the first exterior material 71, which will be described later. It can be suppressed. Here, the thickness of the burr B2 (that is, the length in the first direction d1) may be about half the thickness of the tab 6b. Therefore, the total thickness of the negative electrode 20Ya of the first group and the thickness of the sealant layer 71b of the first exterior material 71, which will be described later, is more than half the thickness of the tab 6b, so that the burr B2 is formed. It is possible to suppress a problem that the first exterior material 71, which will be described later, comes into contact with the metal layer 71a. In this case, the total thickness of the negative electrode 20Ya of the first group and the thickness of the sealant layer 71b of the first exterior material 71, which will be described later, is preferably 120 μm or more, for example.
さらに、第１群の負極２０Ｙａは、４つ以上９つ以下の負極２０Ｙを含んでいてもよい。第１群の負極２０Ｙａの負極２０Ｙが、４つ以上であることにより、第１群の負極２０Ｙａの厚みを厚くすることができ、タブ６ｂの端面６ｄにバリＢ２が発生していた場合であっても、バリＢ２が後述する第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。また、第１群の負極２０Ｙａの負極２０Ｙが９つ以下であることにより、第１群の負極２０Ｙａを超音波接合によりタブ６ｂに接合する際に、超音波接合に用いられるホーンの振動エネルギーを第１群の負極２０Ｙａの負極２０Ｙの全体に効率良く伝達することができ、負極２０Ｙとタブ６ｂとの間の接合不良の発生を抑制することができる。 Further, the negative electrode 20Y of the first group may include 4 or more and 9 or less negative electrodes 20Y. By having four or more negative electrodes 20Y of the negative electrode 20Ya of the first group, the thickness of the negative electrode 20Ya of the first group can be increased, and burrs B2 are generated on the end face 6d of the tab 6b. However, it is possible to suppress a problem that the burr B2 comes into contact with the metal layer 71a of the first exterior material 71, which will be described later. Further, since the number of negative electrodes 20Y of the negative electrode 20Ya of the first group is 9 or less, the vibration energy of the horn used for ultrasonic bonding when the negative electrode 20Ya of the first group is bonded to the tab 6b by ultrasonic bonding is obtained. It can be efficiently transmitted to the entire negative electrode 20Y of the negative electrode 20Y of the first group, and the occurrence of poor bonding between the negative electrode 20Y and the tab 6b can be suppressed.
なお、図示された例では、第２群の負極２０Ｙｂが２つの負極２０Ｙを含んでいるが、これに限られるものではない。第２群の負極２０Ｙｂの負極２０Ｙの数は任意とすることができる。 In the illustrated example, the negative electrode 20Yb of the second group includes two negative electrodes 20Y, but the present invention is not limited to this. The number of negative electrodes 20Y in the negative electrode 20Yb of the second group can be arbitrary.
次に、絶縁シート３０について説明する。図４に示すように、絶縁シート３０は、正極１０Ｘ（第１電極１０）および負極２０Ｙ（第２電極２０）の間に位置し、正極１０Ｘおよび負極２０Ｙが接触しないように、正極１０Ｘおよび負極２０Ｙを互いに離間させている。本実施の形態では、積層型電池１は、絶縁シート３０を複数備えている。絶縁シート３０は、絶縁性を有しており、正極１０Ｘおよび負極２０Ｙの接触による短絡を防止する。 Next, the insulating sheet 30 will be described. As shown in FIG. 4, the insulating sheet 30 is located between the positive electrode 10X (first electrode 10) and the negative electrode 20Y (second electrode 20) so that the positive electrode 10X and the negative electrode 20Y do not come into contact with each other. The 20Ys are separated from each other. In the present embodiment, the laminated battery 1 includes a plurality of insulating sheets 30. The insulating sheet 30 has an insulating property and prevents a short circuit due to contact between the positive electrode 10X and the negative electrode 20Y.
また、絶縁シート３０は、大きなイオン透過度(透気度)、所定の機械的強度、および、電解液、正極活物質、負極活物質等に対する耐久性を有していることが好ましい。このような絶縁シート３０として、例えば、絶縁性の材料によって形成された多孔質体や不織布等を用いることができる。より具体的には、絶縁シート３０として、融点が８０〜１４０℃程度の熱可塑性樹脂からなる多孔フィルムを用いることができる。熱可塑性樹脂として、ポリプロピレン、ポリエチレンなどのポリオレフィン系ポリマーを採用することができる。外装体７の収容空間７ａには、電極体５とともに電解液が封入される。電解液が、多孔質体や不織布からなる絶縁シート３０に含浸することで、電極１０，２０の電極活物質層１２，２２に電解液が接触した状態に維持される。 Further, the insulating sheet 30 preferably has a large ion permeability (air permeability), a predetermined mechanical strength, and durability against an electrolytic solution, a positive electrode active material, a negative electrode active material, and the like. As such an insulating sheet 30, for example, a porous body or a non-woven fabric formed of an insulating material can be used. More specifically, as the insulating sheet 30, a porous film made of a thermoplastic resin having a melting point of about 80 to 140 ° C. can be used. As the thermoplastic resin, a polyolefin-based polymer such as polypropylene or polyethylene can be adopted. An electrolytic solution is sealed together with the electrode body 5 in the accommodation space 7a of the exterior body 7. By impregnating the insulating sheet 30 made of a porous body or a non-woven fabric with the electrolytic solution, the electrolytic solution is maintained in contact with the electrode active material layers 12 and 22 of the electrodes 10 and 20.
また、絶縁シート３０は、活物質層２２Ｙ，１２Ｘ上に塗工した電解液を活物質層２２Ｙ，１２Ｘ上で固化又はゲル化させて形成されてもよい。電解液として、例えば、高分子マトリックス及び非水電解質液（すなわち、非水溶媒及び電解質塩）からなり、ゲル化されて表面に粘着性を生じるもの、或いは、高分子マトリックス及び非水溶媒からなり、固体電解質となるものを用いることができる。この場合、絶縁シート３０を作製するための具体的な材料は、特に制限はなく、これらを構成するために用いられている種々の材料（例えば、特開２０１２−１９０５６７号公報に開示された材料）を用いることができる。 Further, the insulating sheet 30 may be formed by solidifying or gelling the electrolytic solution coated on the active material layers 22Y and 12X on the active material layers 22Y and 12X. The electrolytic solution is, for example, a polymer matrix and a non-aqueous electrolyte solution (that is, a non-aqueous solvent and an electrolyte salt), which are gelled to cause adhesiveness on the surface, or a polymer matrix and a non-aqueous solvent. , A solid electrolyte can be used. In this case, the specific material for producing the insulating sheet 30 is not particularly limited, and various materials used for forming the insulating sheet 30 (for example, the materials disclosed in Japanese Patent Application Laid-Open No. 2012-190567). ) Can be used.
絶縁シート３０は、例えば第１方向ｄ１に隣り合う任意の二つの電極１０，２０の間に位置している。また、絶縁シート３０は、平面視において、正極１０Ｘの正極活物質層１２Ｘの全領域を覆うように広がっている（図３参照）。同様に、絶縁シート３０は、平面視において、負極２０Ｙの負極活物質層２２Ｙの全領域を覆うように広がっている。このため、絶縁シート３０は、負極２０Ｙの負極活物質層２２Ｙの延在領域２５を覆っている。さらに、図３に示すように、絶縁シート３０は、第３方向ｄ３に沿った幅が、正極１０Ｘおよび負極２０Ｙの第３方向ｄ３に沿った幅よりも広くなっている。 The insulating sheet 30 is located, for example, between any two electrodes 10 and 20 adjacent to each other in the first direction d1. Further, the insulating sheet 30 extends so as to cover the entire region of the positive electrode active material layer 12X of the positive electrode 10X in a plan view (see FIG. 3). Similarly, the insulating sheet 30 extends so as to cover the entire region of the negative electrode active material layer 22Y of the negative electrode 20Y in a plan view. Therefore, the insulating sheet 30 covers the extending region 25 of the negative electrode active material layer 22Y of the negative electrode 20Y. Further, as shown in FIG. 3, the width of the insulating sheet 30 along the third direction d3 is wider than the width of the positive electrode 10X and the negative electrode 20Y along the third direction d3.
次に、タブ６ａ、６ｂについて説明する。タブ６ａ、６ｂは、積層型電池１における端子として機能する。図２乃至図４に示すように、電極体５の正極１０Ｘに一方のタブ６ａが電気的に接続されている。同様に、電極体５の負極２０Ｙに他方のタブ６ｂが電気的に接続されている。図４に示すように、一対のタブ６ａ、６ｂは、外装体７の内部である収容空間７ａから、外装体７の外部へと延び出している。タブ６ａ、６ｂの外装体７の外部に延びている長さは、例えば１０ｍｍ以上２５ｍｍ以下である。なお、外装体７とタブ６ａ、６ｂとの間は、タブ６ａ、６ｂが延び出す領域において、図示しないシール部材を介して封止されている。 Next, tabs 6a and 6b will be described. The tabs 6a and 6b function as terminals in the laminated battery 1. As shown in FIGS. 2 to 4, one tab 6a is electrically connected to the positive electrode 10X of the electrode body 5. Similarly, the other tab 6b is electrically connected to the negative electrode 20Y of the electrode body 5. As shown in FIG. 4, the pair of tabs 6a and 6b extend from the accommodation space 7a inside the exterior body 7 to the outside of the exterior body 7. The length extending to the outside of the exterior body 7 of the tabs 6a and 6b is, for example, 10 mm or more and 25 mm or less. The exterior body 7 and the tabs 6a and 6b are sealed with a seal member (not shown) in a region where the tabs 6a and 6b extend.
タブ６ａ、６ｂは、アルミニウム、銅、ニッケル、ニッケルメッキ銅等を用いて形成され得る。タブ６ａ、６ｂの厚みは、例えば１００μｍ以上１０００μｍ以下であってもよく、一例として、２００μｍであってもよい。 The tabs 6a, 6b can be formed using aluminum, copper, nickel, nickel-plated copper, or the like. The thickness of the tabs 6a and 6b may be, for example, 100 μm or more and 1000 μm or less, and as an example, it may be 200 μm.
次に、外装体７について説明する。外装体７は、電極体５を封止するための包装材である。図４に示すように、外装体７は、第１外装材７１と第２外装材７２とを有している。各外装材７１，７２は、それぞれ金属層７１ａ，７２ａと、金属層７１ａ，７２ａに積層されたシーラント層７１ｂ，７２ｂと、を有している。金属層７１ａ，７２ａは、高いガスバリア性と成形加工性を有することが好ましい。 Next, the exterior body 7 will be described. The exterior body 7 is a packaging material for sealing the electrode body 5. As shown in FIG. 4, the exterior body 7 has a first exterior material 71 and a second exterior material 72. Each of the exterior materials 71 and 72 has metal layers 71a and 72a and sealant layers 71b and 72b laminated on the metal layers 71a and 72a, respectively. The metal layers 71a and 72a preferably have high gas barrier properties and molding processability.
金属層７１ａ，７２ａをなす材料としては、外部からの水分の侵入を防ぎつつ積層型電池１の強度を向上させるものであれば特に限定されないが、水分遮断性と重量ならびにコストの面から公知の金属、金属酸化物、金属窒化物及びこれらの合金を用いることができ、アルミニウム、アルミニウム合金、ステンレス等が好ましく、アルミニウムを特に好ましく用いることができる。積層型電池１全体の強度が確保できるのであれば、金属箔の代わりに蒸着やスパッタリングなどにより金属層を設けても良い。 The materials forming the metal layers 71a and 72a are not particularly limited as long as they improve the strength of the laminated battery 1 while preventing the intrusion of moisture from the outside, but are known from the viewpoints of moisture blocking property, weight and cost. Metals, metal oxides, metal nitrides and alloys thereof can be used, aluminum, aluminum alloys, stainless steel and the like are preferable, and aluminum can be particularly preferably used. If the strength of the entire laminated battery 1 can be ensured, a metal layer may be provided by vapor deposition or sputtering instead of the metal foil.
シーラント層７１ｂ，７２ｂは、絶縁性を有しており、外装体７内に収容する電極体５と金属層７１ａ，７２ａとの短絡を防止する。また、シーラント層７１ｂ，７２ｂは、絶縁性に加えて、熱可塑性（接着性）を有している。第１外装材７１および第２外装材７２は、シーラント層７１ｂ，７２ｂが互いに対面するようにして積層され、その周縁を互いに溶着されている。さらに、第１外装材７１および第２外装材７２の間に、電極体５の収容空間７ａが形成される。シーラント層７１ｂ，７２ｂの厚みは、それぞれ３０μｍ以上２００μｍ以下程度であってもよく、一例として、７５μｍであってもよい。 The sealant layers 71b and 72b have an insulating property and prevent a short circuit between the electrode body 5 housed in the exterior body 7 and the metal layers 71a and 72a. Further, the sealant layers 71b and 72b have thermoplasticity (adhesiveness) in addition to insulating properties. The first exterior material 71 and the second exterior material 72 are laminated so that the sealant layers 71b and 72b face each other, and the peripheral edges thereof are welded to each other. Further, a storage space 7a for the electrode body 5 is formed between the first exterior material 71 and the second exterior material 72. The thickness of the sealant layers 71b and 72b may be about 30 μm or more and 200 μm or less, respectively, and may be 75 μm as an example.
外装体７は、電極体５および電解液をその内部に密閉する。シーラント層７１ｂ，７２ｂは、電解液にも接触することから、耐薬品性を有していることが好ましい。このようなシーラント層７１ｂ，７２ｂの材料として、ポリオレフィン系樹脂、具体的には、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・酢酸ビニルを用いることができる。 The exterior body 7 seals the electrode body 5 and the electrolytic solution inside. Since the sealant layers 71b and 72b also come into contact with the electrolytic solution, they preferably have chemical resistance. As a material for such sealant layers 71b and 72b, polyolefin-based resins, specifically polypropylene, modified polypropylene, low-density polypropylene, ionomer, and ethylene-vinyl acetate can be used.
図示された例において、第１外装材７１および第２外装材７２は、カップ状に形成されている。図４に示すように、第１外装材７１および第２外装材７２は、それぞれカップ状の膨出部７３ａ、７３ｂと、膨出部７３ａ、７３ｂに接続した鍔部７４ａ、７４ｂと、を有している。鍔部７４ａ、７４ｂは、膨出部７３ａ、７３ｂを周状に取り囲み、膨出部７３ａ、７３ｂの周縁と接続している。鍔部７４ａ、７４ｂは、第１外装材７１と第２外装材７２との間の収容空間７ａを密閉するように、互いに接着している。膨出部７３ａ、７３ｂは、例えば絞り加工によって製造される。 In the illustrated example, the first exterior material 71 and the second exterior material 72 are formed in a cup shape. As shown in FIG. 4, the first exterior material 71 and the second exterior material 72 have cup-shaped bulging portions 73a and 73b, and flange portions 74a and 74b connected to the bulging portions 73a and 73b, respectively. are doing. The flange portions 74a and 74b surround the bulging portions 73a and 73b in a circumferential shape and are connected to the peripheral edges of the bulging portions 73a and 73b. The collar portions 74a and 74b are adhered to each other so as to seal the accommodation space 7a between the first exterior material 71 and the second exterior material 72. The bulging portions 73a and 73b are manufactured by, for example, drawing.
ただし、以上の例に限られず、外装体７は、一枚の外装材を折り返すことによって、形成されるようにしてもよい。この例において、外装体７は、折り返し部以外の縁部において、互いに対向する外装材を接着してなる接着領域を有することになる。また、第１外装材７１が板状の部材として形成されていてもよい。 However, the present invention is not limited to the above examples, and the exterior body 7 may be formed by folding back one exterior material. In this example, the exterior body 7 has an adhesive region formed by adhering exterior materials facing each other at an edge portion other than the folded portion. Further, the first exterior material 71 may be formed as a plate-shaped member.
次に、本実施の形態の積層型電池１の製造方法の一例について、説明する。 Next, an example of the manufacturing method of the laminated battery 1 of the present embodiment will be described.
まず、正極１０Ｘ、負極２０Ｙおよび絶縁シート３０を作製する。正極１０Ｘ、負極２０Ｙおよび絶縁シート３０は、上述した材料および製造方法により作製することができる。次に、図７に示すように、複数の正極１０Ｘと、複数の負極２０Ｙとを第１方向ｄ１に交互に積層する。この際、作製された正極１０Ｘと、負極２０Ｙと、絶縁シート３０とを、絶縁シート３０が、第１方向ｄ１に隣り合う正極１０Ｘおよび負極２０Ｙの間に配置されるように積層する。この場合、複数の絶縁シート３０の各々が第１方向ｄ１に隣り合う正極１０Ｘおよび負極２０Ｙの間に配置されるように積層される。このようにして、電極体５が得られる。 First, a positive electrode 10X, a negative electrode 20Y, and an insulating sheet 30 are produced. The positive electrode 10X, the negative electrode 20Y, and the insulating sheet 30 can be manufactured by the above-mentioned materials and manufacturing methods. Next, as shown in FIG. 7, a plurality of positive electrodes 10X and a plurality of negative electrodes 20Y are alternately laminated in the first direction d1. At this time, the produced positive electrode 10X, the negative electrode 20Y, and the insulating sheet 30 are laminated so that the insulating sheet 30 is arranged between the positive electrode 10X and the negative electrode 20Y adjacent to each other in the first direction d1. In this case, each of the plurality of insulating sheets 30 is laminated so as to be arranged between the positive electrode 10X and the negative electrode 20Y adjacent to each other in the first direction d1. In this way, the electrode body 5 is obtained.
次に、図８に示すように、複数の正極１０Ｘをタブ（第１タブ）６ａ上に重ねて配置する。この場合、複数の正極１０Ｘの正極集電体１１Ｘをタブ６ａ上に重ねて配置する。また、この際、複数の正極１０Ｘのうちの第１群の正極１０Ｘａ（第１群の第１電極１０ａ）を、第１群の正極１０Ｘａの厚みと第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みが、タブ６ａの厚みの半分以上となるように、タブ６ａの第１方向ｄ１における一側に配置する。さらに、複数の正極１０Ｘのうちの第２群の正極１０Ｘｂ（第２群の第１電極１０ｂ）を、タブ６ａの第１方向ｄ１における他側に配置する。 Next, as shown in FIG. 8, a plurality of positive electrodes 10X are arranged so as to be stacked on the tab (first tab) 6a. In this case, a plurality of positive electrode current collectors 11X of the positive electrodes 10X are arranged so as to be overlapped on the tab 6a. At this time, the positive electrode 10Xa of the first group (the first electrode 10a of the first group) of the plurality of positive electrodes 10X is the thickness of the positive electrode 10Xa of the first group and the thickness of the sealant layer 71b of the first exterior material 71. The tabs 6a are arranged on one side in the first direction d1 so that the total thickness of the tabs 6a is at least half the thickness of the tabs 6a. Further, the positive electrode 10Xb of the second group (the first electrode 10b of the second group) of the plurality of positive electrodes 10X is arranged on the other side of the tab 6a in the first direction d1.
次いで、複数の正極１０Ｘをタブ６ａに接合する。この場合、例えば、正極１０Ｘの正極集電体１１Ｘをタブ６ａ上で超音波接合する。超音波接合では、例えば正極１０Ｘの正極集電体１１Ｘを加圧しながら接合する。この加圧は、例えば０．２ＭＰａ以上０．４ＭＰａ以下に加圧した状態を、０．５秒以上１秒以下維持することで行われる。このようにして、複数の正極１０Ｘの正極集電体１１Ｘを互いに電気的に接続するとともに、さらにタブ６ａとも電気的に接続する。 Next, the plurality of positive electrodes 10X are joined to the tab 6a. In this case, for example, the positive electrode current collector 11X of the positive electrode 10X is ultrasonically bonded on the tab 6a. In ultrasonic bonding, for example, bonding is performed while pressurizing the positive electrode current collector 11X of the positive electrode 10X. This pressurization is performed, for example, by maintaining a state of pressurizing to 0.2 MPa or more and 0.4 MPa or less for 0.5 seconds or more and 1 second or less. In this way, the positive electrode current collectors 11X of the plurality of positive electrodes 10X are electrically connected to each other, and are further electrically connected to the tab 6a.
また、図９に示すように、複数の負極２０Ｙをタブ（第２タブ）６ｂ上に重ねて配置する。この場合、複数の負極２０Ｙの負極集電体２１Ｙをタブ６ｂ上に重ねて配置する。また、この際、複数の負極２０Ｙのうちの第１群の負極２０Ｙａ（第１群の第２電極２０ａ）を、第１群の負極２０Ｙａの厚みと第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みが、タブ６ｂの厚みの半分以上となるように、タブ６ｂの第１方向ｄ１における一側に配置する。さらに、複数の負極２０Ｙのうちの第２群の負極２０Ｙｂ（第２群の第２電極２０ｂ）を、タブ６ｂの第１方向ｄ１における他側に配置する。 Further, as shown in FIG. 9, a plurality of negative electrodes 20Y are arranged so as to be overlapped on the tab (second tab) 6b. In this case, the negative electrode current collectors 21Y of the plurality of negative electrodes 20Y are arranged so as to be overlapped on the tab 6b. At this time, the negative electrode 20Y of the first group (the second electrode 20a of the first group) of the plurality of negative electrodes 20Y is the thickness of the negative electrode 20Ya of the first group and the thickness of the sealant layer 71b of the first exterior material 71. The tabs 6b are arranged on one side in the first direction d1 so that the total thickness of the tabs 6b is at least half the thickness of the tabs 6b. Further, the negative electrode 20Yb of the second group (the second electrode 20b of the second group) of the plurality of negative electrodes 20Y is arranged on the other side of the tab 6b in the first direction d1.
次いで、複数の負極２０Ｙをタブ６ｂに接合する。この場合、例えば、負極２０Ｙの負極集電体２１Ｙをタブ６ｂ上で超音波接合する。超音波接合では、例えば負極２０Ｙの負極集電体２１Ｙを加圧しながら接合する。この加圧は、例えば０．３ＭＰａ以上０．５ＭＰａ以下に加圧した状態を、０．５秒以上１秒以下維持することで行われる。このようにして、複数の負極２０Ｙの負極集電体２１Ｙを互いに電気的に接続するとともに、さらにタブ６ｂとも電気的に接続する。 Next, the plurality of negative electrodes 20Y are joined to the tab 6b. In this case, for example, the negative electrode current collector 21Y of the negative electrode 20Y is ultrasonically bonded on the tab 6b. In ultrasonic bonding, for example, bonding is performed while pressurizing the negative electrode current collector 21Y of the negative electrode 20Y. This pressurization is performed, for example, by maintaining a state of pressurizing to 0.3 MPa or more and 0.5 MPa or less for 0.5 seconds or more and 1 second or less. In this way, the negative electrode current collectors 21Y of the plurality of negative electrodes 20Y are electrically connected to each other, and are further electrically connected to the tab 6b.
また、金属層７１ａ、７２ａおよび金属層７１ａ、７２ａに積層されたシーラント層７１ｂ、７２ｂを含み、外装体７を構成する第１外装材７１および第２外装材７２を準備する。第１外装材７１および第２外装材７２には、例えば絞り加工によって、膨出部７３ａ、７３ｂを形成する。 Further, the first exterior material 71 and the second exterior material 72, which include the metal layers 71a and 72a and the sealant layers 71b and 72b laminated on the metal layers 71a and 72a, and constitute the exterior body 7, are prepared. The first exterior material 71 and the second exterior material 72 are formed with bulging portions 73a and 73b, for example, by drawing.
次に、複数の正極１０Ｘおよび複数の負極２０Ｙを、外装体７内に収容する。この際、例えば、第２外装材７２の膨出部７３ｂ内に電極体５を収容し、さらに第２外装材７２上に第１外装材７１を積層する。このとき、第２外装材７２のシーラント層７２ｂと第１外装材７１のシーラント層７１ｂとを対面させる。また、各タブ６ａ、６ｂが第１外装材７１と第２外装材７２との間から延び出すようにする。 Next, the plurality of positive electrodes 10X and the plurality of negative electrodes 20Y are housed in the exterior body 7. At this time, for example, the electrode body 5 is housed in the bulging portion 73b of the second exterior material 72, and the first exterior material 71 is further laminated on the second exterior material 72. At this time, the sealant layer 72b of the second exterior material 72 and the sealant layer 71b of the first exterior material 71 are made to face each other. Further, the tabs 6a and 6b are made to extend from between the first exterior material 71 and the second exterior material 72.
その後、第１外装材７１の鍔部７４ａと第２外装材７２の鍔部７４ｂとを接合する。第１外装材７１と第２外装材７２との接合は、例えば第１外装材７１および第２外装材７２を加熱・加圧することで溶着により接合する。この加熱・加圧は、例えば第１外装材７１および第２外装材７２を１２０℃以上２００℃以下に加熱しながら、０．２ＭＰａ以上０．８ＭＰａ以下に加圧した状態を、１秒以上８秒以下維持することで行われる。 After that, the flange portion 74a of the first exterior material 71 and the collar portion 74b of the second exterior material 72 are joined. The first exterior material 71 and the second exterior material 72 are joined by welding, for example, by heating and pressurizing the first exterior material 71 and the second exterior material 72. This heating / pressurizing is performed by heating the first exterior material 71 and the second exterior material 72 to 120 ° C. or higher and 200 ° C. or lower, and pressing the pressure to 0.2 MPa or higher and 0.8 MPa or lower for 1 second or longer. It is done by keeping it for less than a second.
以上の工程により、図１０に示すように、積層型電池１が製造される。この際、第１群の正極１０Ｘａは、第１方向ｄ１においてタブ６ａの端面６ｃ（図５参照）と外装体７との間に介在するとともに、外装体７に接触する。また、第１群の負極２０Ｙａは、第１方向ｄ１においてタブ６ｂの端面６ｄ（図６参照）と外装体７との間に介在するとともに、外装体７に接触する。 As shown in FIG. 10, the laminated battery 1 is manufactured by the above steps. At this time, the positive electrode 10Xa of the first group is interposed between the end surface 6c (see FIG. 5) of the tab 6a and the exterior body 7 in the first direction d1 and comes into contact with the exterior body 7. Further, the negative electrode 20Ya of the first group is interposed between the end surface 6d of the tab 6b (see FIG. 6) and the exterior body 7 in the first direction d1 and comes into contact with the exterior body 7.
以上のように、本実施の形態によれば、複数の正極１０Ｘが、第１方向ｄ１においてタブ６ａの端面６ｃと外装体７との間に介在するとともにタブ６ａの第１方向ｄ１における一側に位置し、外装体７に接触する第１群の正極１０Ｘａを含んでいる。また、第１群の正極１０Ｘａの厚みと、第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みが、タブ６ａの厚みの半分以上になっている。これにより、タブ６ａの端面６ｃにバリＢ１が発生していた場合であっても、バリＢ１が第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。また、複数の正極１０Ｘが第１群の正極１０Ｘａを含んでいることにより、第１外装材７１に、シーラント層７１ｂを保護するための、例えば保護テープを設けなくてもよい。このため、積層型電池１の製造工程が増加することを抑制することができ、積層型電池１の製造コストを低減することができる。さらに、複数の正極１０Ｘが第１群の正極１０Ｘａを含んでいることにより、バリＢ１が第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができるため、タブ６ａからバリＢ１が除去されていなくてもよい。このため、タブ６ａの製造コストを低減することができ。積層型電池１の製造コストを低減することができる。 As described above, according to the present embodiment, a plurality of positive electrodes 10X are interposed between the end face 6c of the tab 6a and the exterior body 7 in the first direction d1 and one side of the tab 6a in the first direction d1. It is located in and contains a first group of positive electrodes 10Xa that come into contact with the exterior body 7. Further, the total thickness of the positive electrode 10Xa of the first group and the thickness of the sealant layer 71b of the first exterior material 71 is more than half the thickness of the tab 6a. As a result, even when the burr B1 is generated on the end surface 6c of the tab 6a, it is possible to suppress the problem that the burr B1 comes into contact with the metal layer 71a of the first exterior material 71. Further, since the plurality of positive electrodes 10X include the positive electrodes 10Xa of the first group, it is not necessary to provide the first exterior material 71 with, for example, a protective tape for protecting the sealant layer 71b. Therefore, it is possible to suppress an increase in the manufacturing process of the laminated battery 1, and it is possible to reduce the manufacturing cost of the laminated battery 1. Further, since the plurality of positive electrodes 10X include the positive electrode 10Xa of the first group, it is possible to suppress a problem that the burr B1 comes into contact with the metal layer 71a of the first exterior material 71, and thus the burr from the tab 6a. B1 may not be removed. Therefore, the manufacturing cost of the tab 6a can be reduced. The manufacturing cost of the laminated battery 1 can be reduced.
また、本実施の形態によれば、複数の負極２０Ｙが、第１方向ｄ１においてタブ６ｂの端面６ｄと外装体７との間に介在するとともにタブ６ｂの第１方向ｄ１における一側に位置し、外装体７に接触する第１群の負極２０Ｙａを含んでいる。また、第１群の負極２０Ｙａの厚みと、第１外装材７１のシーラント層７１ｂの厚みとを合計した厚みが、タブ６ｂの厚みの半分以上になっている。これにより、タブ６ｂの端面６ｄにバリＢ２が発生していた場合であっても、バリＢ２が第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができる。また、複数の負極２０Ｙが第１群の負極２０Ｙａを含んでいることにより、第１外装材７１に、シーラント層７１ｂを保護するための、例えば保護テープを設けなくてもよい。このため、積層型電池１の製造工程が増加することを抑制することができ、積層型電池１の製造コストを低減することができる。さらに、複数の負極２０Ｙが第１群の負極２０Ｙａを含んでいることにより、バリＢ２が第１外装材７１の金属層７１ａと接触してしまう不具合を抑制することができるため、タブ６ｂからバリＢ２が除去されていなくてもよい。このため、タブ６ｂの製造コストを低減することができ。積層型電池１の製造コストを低減することができる。 Further, according to the present embodiment, a plurality of negative electrodes 20Y are interposed between the end surface 6d of the tab 6b and the exterior body 7 in the first direction d1 and are located on one side of the tab 6b in the first direction d1. , Includes a first group of negative electrodes 20Ya in contact with the exterior body 7. Further, the total thickness of the negative electrode 20Ya of the first group and the thickness of the sealant layer 71b of the first exterior material 71 is more than half the thickness of the tab 6b. As a result, even when the burr B2 is generated on the end surface 6d of the tab 6b, it is possible to suppress the problem that the burr B2 comes into contact with the metal layer 71a of the first exterior material 71. Further, since the plurality of negative electrodes 20Y include the negative electrodes 20Ya of the first group, it is not necessary to provide the first exterior material 71 with, for example, a protective tape for protecting the sealant layer 71b. Therefore, it is possible to suppress an increase in the manufacturing process of the laminated battery 1, and it is possible to reduce the manufacturing cost of the laminated battery 1. Further, since the plurality of negative electrodes 20Y include the negative electrodes 20Ya of the first group, it is possible to suppress a problem that the burr B2 comes into contact with the metal layer 71a of the first exterior material 71, and thus the burr from the tab 6b. B2 may not be removed. Therefore, the manufacturing cost of the tab 6b can be reduced. The manufacturing cost of the laminated battery 1 can be reduced.
なお、上記において、複数の正極１０Ｘが、第２群の正極１０Ｘｂを含んでいる場合を例にとって説明したが、これに限られるものではない。例えば、図示はしないが、複数の正極１０Ｘが、第２群の正極１０Ｘｂを含んでいなくてもよい。 In the above description, the case where the plurality of positive electrodes 10X include the positive electrode 10Xb of the second group has been described as an example, but the present invention is not limited to this. For example, although not shown, the plurality of positive electrodes 10X may not include the positive electrode 10Xb of the second group.
また、上記において、複数の負極２０Ｙが、第２群の負極２０Ｙｂを含んでいる場合を例にとって説明したが、これに限られるものではない。例えば、図示はしないが、複数の負極２０Ｙが、第２群の負極２０Ｙｂを含んでいなくてもよい。 Further, in the above description, the case where the plurality of negative electrodes 20Y include the negative electrode 20Yb of the second group has been described as an example, but the present invention is not limited to this. For example, although not shown, the plurality of negative electrodes 20Y may not include the second group of negative electrodes 20Yb.
本発明の態様は、上述した実施の形態に限定されるものではなく、当業者が想到しうる種々の変形も含むものであり、本発明の効果も上述した内容に限定されない。すなわち、特許請求の範囲に規定された内容およびその均等物から導き出される本発明の概念的な思想と趣旨を逸脱しない範囲で種々の追加、変更および部分的削除が可能である。 Aspects of the present invention are not limited to the above-described embodiments, but include various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the above-mentioned contents. That is, various additions, changes and partial deletions are possible without departing from the conceptual idea and purpose of the present invention derived from the contents defined in the claims and their equivalents.
なお、以上において上述した実施の形態に対するいくつかの変形例を説明してきたが、当然に、複数の変形例を適宜組み合わせて適用することも可能である。 Although some modifications to the above-described embodiments have been described above, it is naturally possible to apply a plurality of modifications in combination as appropriate.
１ 積層型電池
６ａ 第１タブ
６ｂ 第２タブ
６ｃ 端面
６ｄ 端面
７ 外装体
１０ 第１電極
１０ａ 第１群の第１電極
１０ｂ 第２群の第１電極
１０Ｘ 正極
１０Ｘａ 第１群の正極
１０Ｘｂ 第２群の正極
２０ 第２電極
２０ａ 第１群の第２電極
２０ｂ 第２群の第２電極
２０Ｙ 負極
２０Ｙａ 第１群の負極
２０Ｙｂ 第２群の負極
７１ 第１外装材
７１ａ 金属層
７１ｂ シーラント層
1 Stacked battery 6a 1st tab 6b 2nd tab 6c End face 6d End face 7 Exterior 10 1st electrode 10a 1st electrode 10b 1st group 1st electrode 10X Positive electrode 10Xa 1st group positive electrode 10Xb 2nd Group positive electrode 20 Second electrode 20a Group 1 second electrode 20b Group 2 second electrode 20Y Negative electrode 20Ya Group 1 negative electrode 20Yb Group 2 negative electrode 71 First exterior material 71a Metal layer 71b Sealant layer
Claims (11)
前記第１電極と積層方向に交互に積層された複数の第２電極と、
金属層および前記金属層に積層されたシーラント層を含む外装材を用いて形成され、前記第１電極および前記第２電極を収容する外装体と、
前記第１電極と電気的に接続するとともに、前記外装体の内部から外部へと延び出す第１タブと、
前記第２電極と電気的に接続するとともに、前記外装体の内部から外部へと延び出す第２タブと、を備え、
複数の前記第１電極は、前記積層方向において前記第１タブの端面と前記外装体との間に介在するとともに前記第１タブの前記積層方向における一側に位置し、前記外装体に接触する第１群の第１電極を含み、
前記第１群の第１電極の厚みと前記シーラント層の厚みとを合計した厚みは、前記第１タブの厚みの半分以上である、積層型電池。 With multiple first electrodes,
A plurality of second electrodes laminated alternately with the first electrode in the stacking direction,
An exterior body formed by using a metal layer and an exterior material including a sealant layer laminated on the metal layer, and accommodating the first electrode and the second electrode.
A first tab that is electrically connected to the first electrode and extends from the inside to the outside of the exterior body,
It is provided with a second tab that is electrically connected to the second electrode and extends from the inside to the outside of the exterior body.
The plurality of first electrodes are interposed between the end face of the first tab and the exterior body in the stacking direction, and are located on one side of the first tab in the stacking direction and come into contact with the exterior body. Includes the first electrode of the first group,
A laminated battery in which the total thickness of the thickness of the first electrode of the first group and the thickness of the sealant layer is at least half the thickness of the first tab.
前記第１群の第２電極の厚みと前記シーラント層の厚みとを合計した厚みは、前記第２タブの厚みの半分以上である、請求項１乃至３のいずれか一項に記載の積層型電池。 The plurality of second electrodes are interposed between the end face of the second tab and the exterior body in the stacking direction, and are located on one side of the second tab in the stacking direction and come into contact with the exterior body. Includes the second electrode of the first group,
The laminated type according to any one of claims 1 to 3, wherein the total thickness of the thickness of the second electrode of the first group and the thickness of the sealant layer is at least half the thickness of the second tab. battery.
複数の前記第１電極を第１タブ上に重ねて配置する工程と、
複数の前記第１電極を前記第１タブに接合する工程と、
複数の前記第１電極および複数の前記第２電極を、金属層および前記金属層に積層されたシーラント層を含む外装材を用いて形成された外装体内に収容する工程と、を備え、
前記複数の前記第１電極を第１タブ上に重ねて配置する工程において、複数の前記第１電極のうちの第１群の第１電極を、前記第１群の第１電極の厚みと前記シーラント層の厚みとを合計した厚みが、前記第１タブの厚みの半分以上となるように、前記第１タブの前記積層方向における一側に配置し、
前記第１群の第１電極は、前記積層方向において前記第１タブの端面と前記外装体との間に介在するとともに、前記外装体に接触する、積層型電池の製造方法。 A step of alternately laminating a plurality of first electrodes and a plurality of second electrodes in the laminating direction,
A step of arranging a plurality of the first electrodes on top of each other on the first tab,
A step of joining a plurality of the first electrodes to the first tab, and
A step of accommodating the plurality of the first electrodes and the plurality of the second electrodes in an exterior body formed by using an exterior material including a metal layer and a sealant layer laminated on the metal layer.
In the step of superimposing the plurality of first electrodes on the first tab, the first electrode of the first group among the plurality of first electrodes is set to the thickness of the first electrode of the first group and the said. The first tab is arranged on one side in the stacking direction so that the total thickness of the sealant layer is at least half the thickness of the first tab.
A method for manufacturing a laminated battery, wherein the first electrode of the first group is interposed between the end face of the first tab and the exterior body in the stacking direction and is in contact with the exterior body.
複数の前記第２電極を前記第２タブに接合する工程と、を更に備え、
前記複数の前記第２電極を第２タブ上に重ねて配置する工程において、複数の前記第２電極のうちの第１群の第２電極を、前記第１群の第２電極の厚みと前記シーラント層の厚みとを合計した厚みが、前記第２タブの厚みの半分以上となるように、前記第２タブの前記積層方向における一側に配置し、
前記第１群の第２電極は、前記積層方向において前記第２タブの端面と前記外装体との間に介在するとともに、前記外装体に接触する、請求項８または９に記載の積層型電池の製造方法。 A step of arranging a plurality of the second electrodes on top of each other on the second tab,
A step of joining the plurality of the second electrodes to the second tab is further provided.
In the step of superimposing the plurality of the second electrodes on the second tab, the second electrode of the first group among the plurality of the second electrodes is set to the thickness of the second electrode of the first group and the said. The second tab is arranged on one side in the stacking direction so that the total thickness of the sealant layer is at least half the thickness of the second tab.
The laminated battery according to claim 8 or 9, wherein the second electrode of the first group is interposed between the end face of the second tab and the outer body in the laminated direction and is in contact with the outer body. Manufacturing method.
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