JP2020024872A - Power storage device - Google Patents

Power storage device Download PDF

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JP2020024872A
JP2020024872A JP2018149314A JP2018149314A JP2020024872A JP 2020024872 A JP2020024872 A JP 2020024872A JP 2018149314 A JP2018149314 A JP 2018149314A JP 2018149314 A JP2018149314 A JP 2018149314A JP 2020024872 A JP2020024872 A JP 2020024872A
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exterior
exterior part
storage device
power storage
laminate
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幹也 栗田
Mikiya Kurita
幹也 栗田
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Toyota Industries Corp
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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
    • 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
    • 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
    • Y02E60/13—Energy storage using capacitors
    • 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

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Abstract

To provide a power storage device capable of preventing an electrode of an outermost layer of a stack from being damaged.SOLUTION: A power storage device 1 comprises: a stack 2 formed by stacking a negative electrode 4, a positive electrode 5, a negative-electrode collection plate 6, and a positive-electrode collection plate 7; a laminate film 3 covering the stack 2; and a negative-electrode tab 9 and a positive-electrode tab 10 electrically connected to the negative-electrode collection plate 6 and the positive-electrode collection plate 7 and led out of the laminate film 3. The laminate film 3 has an upper exterior part 11 and a lower exterior part 12 arranged to face each other in a stacking direction of the stack 2, and the upper exterior part 11 and the lower exterior part 12 have substantially U-shaped cross sections, and have dummy layers 23 arranged between inner wall faces 13a, 16a perpendicular to the stacking direction of the upper exterior part 11 and the lower exterior part 12 and an upper end face 2a and a lower end face 2b in the stacking direction of the stack 2, outer shape dimensions of the dummy layers 23 viewed from the stacking direction being larger than outer shape dimensions of the negative electrode 4 and the positive electrode 5 viewed from the stacking direction.SELECTED DRAWING: Figure 2

Description

本発明は、蓄電装置に関する。   The present invention relates to a power storage device.

従来の蓄電装置としては、例えば特許文献１に記載されている技術が知られている。特許文献１に記載の蓄電装置は、正極層及び負極層の組み合わせの構成を複数有する発電要素と、発電要素を被覆する高分子金属複合フィルムと、高分子金属複合フィルムの内部から外部へ取り出されるタブとを有している。   As a conventional power storage device, for example, a technology described in Patent Literature 1 is known. The power storage device described in Patent Literature 1 has a power generating element having a plurality of combinations of a positive electrode layer and a negative electrode layer, a polymer metal composite film covering the power generating element, and is taken out from the inside of the polymer metal composite film to the outside. And a tab.

特開２００６−１２８０３８号公報JP 2006-128038 A

しかしながら、上記従来技術においては、高分子金属複合フィルムが断面略Ｕ字状を呈しているため、発電要素（積層体）における最外層の電極の縁部が外部からの応力を受けやすく、当該電極が損傷してしまうおそれがある。   However, in the above-mentioned conventional technology, since the polymer-metal composite film has a substantially U-shaped cross section, the edge of the outermost layer electrode in the power generation element (laminated body) is susceptible to external stress, so May be damaged.

本発明の目的は、積層体における最外層の電極の損傷を防止することができる蓄電装置を提供することである。   An object of the present invention is to provide a power storage device capable of preventing damage to an outermost layer electrode in a laminate.

本発明の一態様に係る蓄電装置は、電極及び集電板が積層されてなる積層体と、積層体を覆う外装部材と、集電板と電気的に接続され、外装部材の外部に取り出されるタブとを備え、外装部材は、積層体の積層方向に互いに対向するように配置された第１外装部及び第２外装部を有し、第１外装部及び第２外装部の少なくとも一方は、断面略Ｕ字状を呈し、第１外装部及び第２外装部の少なくとも一方における積層方向に垂直な内壁面と積層体の積層方向の端面との間には、ダミー層が配置されており、積層方向から見たダミー層の外形寸法は、積層方向から見た電極の外形寸法よりも大きい。   The power storage device according to one embodiment of the present invention is a stack in which an electrode and a current collector are stacked, an exterior member that covers the stack, and an electrical connection with the current collector, which is taken out of the exterior member. A tab, and the exterior member has a first exterior portion and a second exterior portion arranged to face each other in the stacking direction of the laminate, and at least one of the first exterior portion and the second exterior portion includes: A dummy layer is disposed between the inner wall surface perpendicular to the laminating direction and the end surface in the laminating direction of the laminate in at least one of the first exterior part and the second exterior part, having a substantially U-shaped cross section, The outer dimensions of the dummy layer viewed from the laminating direction are larger than the outer dimensions of the electrodes viewed from the laminating direction.

このような蓄電装置においては、外装部材を構成する第１外装部及び第２外装部のうち断面略Ｕ字状を呈する外装部における積層方向に垂直な内壁面と積層体の積層方向の端面との間には、ダミー層が配置されており、積層方向から見たダミー層の外形寸法は、積層方向から見た電極の外形寸法よりも大きい。従って、蓄電装置に外部からの応力が加わったときには、外部からの応力をダミー層が受けることになるため、積層体における最外層の電極の縁部が外部からの応力を受けにくい。これにより、積層体における最外層の電極の損傷が防止される。   In such a power storage device, the inner wall surface perpendicular to the laminating direction and the end surface in the laminating direction of the laminated body in the laminar direction of the laminar portion having a substantially U-shaped cross section among the first laminating portion and the second laminating portion constituting the laminating member. A dummy layer is disposed between the layers, and the outer dimensions of the dummy layer as viewed in the stacking direction are larger than the outer dimensions of the electrodes as viewed in the stacking direction. Therefore, when an external stress is applied to the power storage device, the external stress is applied to the dummy layer, so that the edge of the electrode of the outermost layer in the stacked body is less likely to receive the external stress. This prevents the outermost layer electrode in the laminate from being damaged.

第１外装部及び第２外装部は、何れも断面略Ｕ字状を呈し、ダミー層は、第１外装部及び第２外装部における積層方向に垂直な内壁面と積層体の積層方向の両端面との間にそれぞれ配置されていてもよい。この場合には、積層体における積層方向両側の最外層の電極の縁部が外部からの応力を受けにくくなるため、積層体における積層方向両側の最外層の電極の損傷が防止される。   Each of the first exterior part and the second exterior part has a substantially U-shaped cross section, and the dummy layer has inner wall surfaces perpendicular to the lamination direction of the first exterior part and the second exterior part and both ends in the stacking direction of the stacked body. It may be arranged between the respective surfaces. In this case, since the edges of the outermost layer electrodes on both sides in the stacking direction of the laminate are less likely to receive external stress, damage to the outermost layer electrodes on both sides in the stacking direction of the laminate is prevented.

ダミー層の外装部材側の主面の縁部には、面取りが設けられていてもよい。この場合には、蓄電装置に外部からの応力が加わったときに、ダミー層の縁部が積層方向の内側に曲がりにくくなると共に、外装部材の曲げ部に亀裂が生じにくくなる。   A chamfer may be provided at an edge of the main surface of the dummy layer on the exterior member side. In this case, when an external stress is applied to the power storage device, the edge of the dummy layer is less likely to bend inward in the stacking direction, and a crack is less likely to be generated in the bent portion of the exterior member.

ダミー層の厚みは、外装部材の厚みよりも大きくてもよい。この場合には、ダミー層は外部からの応力を十分に受けることができる。   The thickness of the dummy layer may be larger than the thickness of the exterior member. In this case, the dummy layer can sufficiently receive external stress.

本発明によれば、積層体における最外層の電極の損傷を防止することができる。   ADVANTAGE OF THE INVENTION According to this invention, damage of the electrode of the outermost layer in a laminated body can be prevented.

本発明の一実施形態に係る蓄電装置を示す平面図である。1 is a plan view illustrating a power storage device according to one embodiment of the present invention. 図１のII−II線断面図である。FIG. 2 is a sectional view taken along line II-II of FIG. 1. 図１に示された蓄電装置の要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part of the power storage device shown in FIG. 1.

以下、本発明の実施形態について、図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の一実施形態に係る蓄電装置を示す平面図である。図２は、図１のII−II線断面図である。図１及び図２において、本実施形態の蓄電装置１は、例えばフォークリフト、ハイブリッド自動車または電気自動車等の各種車両のバッテリとして用いられる。   FIG. 1 is a plan view showing a power storage device according to one embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1 and 2, the power storage device 1 of the present embodiment is used as a battery of various vehicles such as a forklift, a hybrid vehicle, and an electric vehicle.

蓄電装置１は、例えばリチウムイオン二次電池またはニッケル水素二次電池等の二次電池であってもよく、電気二重層キャパシタであってもよい。また、蓄電装置１は、全固体電池であってもよい。本実施形態では、蓄電装置１がリチウムイオン二次電池である場合について例示する。   The power storage device 1 may be a secondary battery such as a lithium ion secondary battery or a nickel hydride secondary battery, or may be an electric double layer capacitor. Further, power storage device 1 may be an all-solid-state battery. In the present embodiment, a case where the power storage device 1 is a lithium ion secondary battery will be described as an example.

蓄電装置１は、積層体２と、この積層体２を覆う外装部材であるラミネートフィルム３とを備えている。なお、本実施形態では、積層体２の積層方向（Ｚ軸方向）を上下方向とする。   The power storage device 1 includes a laminate 2 and a laminate film 3 that is an exterior member that covers the laminate 2. In the present embodiment, the stacking direction (Z-axis direction) of the stacked body 2 is defined as a vertical direction.

積層体２は、電極である負極４及び正極５と負極集電板６及び正極集電板７とセパレータ８とが積層されてなる構造を有している。積層体２の最上層（一方の最外層）及び最下層（他方の最外層）には、負極集電板６が配置されている。積層体２は、積層方向に負極４、負極集電板６、負極４、セパレータ８、正極５、正極集電板７、正極５、セパレータ８及び負極４の順に配置されている。負極４、正極５、負極集電板６、正極集電板７及びセパレータ８は、例えば積層方向から見て矩形状（平面視矩形状）を呈している。   The laminate 2 has a structure in which the negative electrode 4 and the positive electrode 5 serving as electrodes, the negative electrode current collector 6, the positive electrode current collector 7, and the separator 8 are stacked. In the uppermost layer (one outermost layer) and the lowermost layer (the other outermost layer) of the laminate 2, the negative electrode current collectors 6 are arranged. The stacked body 2 includes a negative electrode 4, a negative electrode current collector 6, a negative electrode 4, a separator 8, a positive electrode 5, a positive electrode current collector 7, a positive electrode 5, a separator 8, and a negative electrode 4 arranged in this order in the stacking direction. The negative electrode 4, the positive electrode 5, the negative electrode current collector 6, the positive electrode current collector 7, and the separator 8 have, for example, a rectangular shape (a rectangular shape in a plan view) when viewed from the laminating direction.

負極４は、負極集電板６の両面に形成されている。各負極集電板６は、積層体２のＸ軸方向の一方側に向けて延びている。なお、Ｘ軸方向は、積層方向（Ｚ軸方向）に垂直な方向である。各負極集電板６は、積層方向の内側に屈曲している。そして、各負極集電板６は、互いに電気的に接続されている。   The negative electrode 4 is formed on both surfaces of the negative electrode current collector plate 6. Each negative electrode current collector plate 6 extends toward one side of the laminate 2 in the X-axis direction. The X-axis direction is a direction perpendicular to the laminating direction (Z-axis direction). Each negative electrode current collector plate 6 is bent inward in the stacking direction. And each negative electrode current collector plate 6 is electrically connected to each other.

正極５は、正極集電板７の両面に形成されている。各正極集電板７は、積層体２のＸ軸方向の他方側に向けて延びている。最も中央に位置する正極集電板７以外の各正極集電板７は、積層方向の内側に屈曲している。そして、各正極集電板７は、互いに電気的に接続されている。   The positive electrode 5 is formed on both surfaces of the positive electrode current collector 7. Each positive electrode current collector 7 extends toward the other side of the laminate 2 in the X-axis direction. Each positive electrode current collector 7 other than the most centrally located positive electrode current collector 7 is bent inward in the stacking direction. The positive electrode current collectors 7 are electrically connected to each other.

負極集電板６及び正極集電板７は、例えば純金属箔または合金箔である。純金属箔としては、例えば銅箔、アルミニウム箔、チタン箔またはニッケル箔が挙げられる。合金箔としては、例えばステンレス鋼箔または上記純金属の合金箔が挙げられる。   The negative electrode current collector 6 and the positive electrode current collector 7 are, for example, a pure metal foil or an alloy foil. Examples of the pure metal foil include a copper foil, an aluminum foil, a titanium foil and a nickel foil. Examples of the alloy foil include a stainless steel foil and an alloy foil of the pure metal.

負極４は、負極活物質と電解質とを含んでいる。負極活物質は、例えば黒鉛、高配向性グラファイト、メソカーボンマイクロビーズ、ハードカーボンまたはソフトカーボン等のカーボン、リチウム、ナトリウム等のアルカリ金属、金属化合物、リチウムと合金化可能な元素であるシリコン、スズまたはその化合物、或いはホウ素添加炭素等である。電解質は、例えば固体電解質、固体高分子電解質またはゲル状電解質である。固体電解質は、ジルコニアまたはβアルミナを含む。固体高分子電解質は、例えばポリエチレンオキシド（ＰＥＯ）、ポリプロピレンオキシド（ＰＰＯ）等のアルキレンオキシド系高分子化合物、若しくはこれらの共重合体を含む。ゲル状電解質は、流動性を完全に若しくはほぼ完全に示さない電解質である。   The negative electrode 4 includes a negative electrode active material and an electrolyte. The negative electrode active material is, for example, graphite, highly oriented graphite, mesocarbon microbeads, carbon such as hard carbon or soft carbon, lithium, an alkali metal such as sodium, a metal compound, and silicon, tin which can be alloyed with lithium. Or a compound thereof, or boron-added carbon. The electrolyte is, for example, a solid electrolyte, a solid polymer electrolyte or a gel electrolyte. Solid electrolytes include zirconia or beta alumina. The solid polymer electrolyte includes, for example, an alkylene oxide polymer compound such as polyethylene oxide (PEO) and polypropylene oxide (PPO), or a copolymer thereof. A gel electrolyte is an electrolyte that does not show fluidity completely or almost completely.

正極５は、正極活物質と電解質とを含んでいる。正極活物質は、例えば複合酸化物、金属リチウムまたは硫黄等である。複合酸化物の組成には、例えばマンガン、チタン、ニッケル、コバルト及びアルミニウムの少なくとも１つとリチウムとが含まれる。電解質は、例えば負極４の電解質と同様である。   The positive electrode 5 contains a positive electrode active material and an electrolyte. The positive electrode active material is, for example, a composite oxide, metallic lithium or sulfur. The composition of the composite oxide includes, for example, at least one of manganese, titanium, nickel, cobalt, and aluminum and lithium. The electrolyte is, for example, the same as the electrolyte of the negative electrode 4.

セパレータ８は、負極４と正極５との間に配置されている。セパレータ８は、負極４及び正極５に含まれる電解質によって構成されている。また、セパレータ８は、電解質を充填可能な多孔質膜であってもよい。セパレータ８が固体電解質によって構成される場合、セパレータ８は略矩形の板状を呈していてもよい。   The separator 8 is disposed between the negative electrode 4 and the positive electrode 5. The separator 8 is composed of the electrolyte contained in the negative electrode 4 and the positive electrode 5. Further, the separator 8 may be a porous film that can be filled with an electrolyte. When the separator 8 is made of a solid electrolyte, the separator 8 may have a substantially rectangular plate shape.

各負極集電板６には、負極タブ９が電気的に接続されている。各正極集電板７には、正極タブ１０が電気的に接続されている。負極タブ９及び正極タブ１０は、例えば負極集電板６及び正極集電板７と同じ材料で形成されている。負極タブ９は、ラミネートフィルム３のＸ軸方向の一方側においてラミネートフィルム３の外部に取り出されている。正極タブ１０は、ラミネートフィルム３のＸ軸方向の他方側においてラミネートフィルム３の外部に取り出されている。   A negative electrode tab 9 is electrically connected to each negative electrode current collector plate 6. A positive electrode tab 10 is electrically connected to each positive electrode current collector 7. The negative electrode tab 9 and the positive electrode tab 10 are formed of, for example, the same material as the negative electrode current collector 6 and the positive electrode current collector 7. The negative electrode tab 9 is taken out of the laminate film 3 on one side of the laminate film 3 in the X-axis direction. The positive electrode tab 10 is taken out of the laminate film 3 on the other side of the laminate film 3 in the X-axis direction.

ラミネートフィルム３は、積層体２の積層方向に互いに対向するように配置された上側外装部１１（第１外装部）及び下側外装部１２（第２外装部）を有している。上側外装部１１及び下側外装部１２は、Ｘ軸方向及びＹ軸方向に垂直に切った断面で略Ｕ字状（以下、断面略Ｕ字状）を呈している。なお、Ｙ軸方向は、Ｘ軸方向及びＺ軸方向に垂直な方向である。   The laminate film 3 has an upper exterior part 11 (first exterior part) and a lower exterior part 12 (second exterior part) arranged to face each other in the stacking direction of the laminate 2. The upper exterior part 11 and the lower exterior part 12 have a substantially U-shape (hereinafter, substantially U-shaped in cross section) in a cross section cut perpendicular to the X-axis direction and the Y-axis direction. The Y-axis direction is a direction perpendicular to the X-axis direction and the Z-axis direction.

上側外装部１１は、天板部分１３と、この天板部分１３に対して屈曲するように設けられた側板部分１４と、この側板部分１４の先端からＸ軸方向及びＹ軸方向の外側に張り出した張出部分１５とからなっている。下側外装部１２は、底板部分１６と、この底板部分１６に対して屈曲するように設けられた側板部分１７と、この側板部分１７の先端からＸ軸方向及びＹ軸方向の外側に張り出した張出部分１８とからなっている。   The upper exterior portion 11 includes a top plate portion 13, a side plate portion 14 provided to bend with respect to the top plate portion 13, and projects outward from the tip of the side plate portion 14 in the X-axis direction and the Y-axis direction. Overhang 15. The lower exterior portion 12 has a bottom plate portion 16, a side plate portion 17 provided to be bent with respect to the bottom plate portion 16, and projects outward from the tip of the side plate portion 17 in the X-axis direction and the Y-axis direction. It comprises an overhang portion 18.

上側外装部１１の張出部分１５及び下側外装部１２の張出部分１８は、負極集電板６、正極集電板７、負極タブ９及び正極タブ１０と熱溶着により接合されている。また、張出部分１５，１８同士も、熱溶着により接合されている。   The overhang portion 15 of the upper exterior portion 11 and the overhang portion 18 of the lower exterior portion 12 are joined to the negative electrode current collector 6, the positive electrode current collector 7, the negative electrode tab 9, and the positive electrode tab 10 by thermal welding. The overhang portions 15, 18 are also joined by heat welding.

上側外装部１１及び下側外装部１２は、図３に示されるように、金属層２０と、この金属層２０よりも積層方向の外側に配置された絶縁樹脂層２１と、金属層２０よりも積層方向の内側に配置されたシール樹脂層２２とからなる３層構造を有している。金属層２０は、アルミニウム、ステンレス鋼、ニッケルまたは銅等の純金属または合金で形成されている。絶縁樹脂層２１は、ポリプロピレン、ポリエチレンまたはポリエチレンテレフタレート等の樹脂で形成されている。シール樹脂層２２は、ポリプロピレンまたはポリエチレン等の樹脂で形成されている。   As shown in FIG. 3, the upper exterior part 11 and the lower exterior part 12 include a metal layer 20, an insulating resin layer 21 disposed outside the metal layer 20 in the stacking direction, and a metal layer 20. It has a three-layer structure composed of the sealing resin layer 22 disposed inside in the laminating direction. The metal layer 20 is formed of a pure metal or alloy such as aluminum, stainless steel, nickel or copper. The insulating resin layer 21 is formed of a resin such as polypropylene, polyethylene, or polyethylene terephthalate. The seal resin layer 22 is formed of a resin such as polypropylene or polyethylene.

上側外装部１１の天板部分１３の内壁面１３ａと積層体２の上端面２ａとの間、及び下側外装部１２の底板部分１６の内壁面１６ａと積層体２の下端面２ｂとの間には、ダミー層２３がそれぞれ配置されている。つまり、ダミー層２３は、上側外装部１１の天板部分１３及び下側外装部１２の底板部分１６と積層体２の最上層及び最下層の負極４との間にそれぞれ配置されている。内壁面１３ａは、上側外装部１１における積層方向に垂直な面である。内壁面１６ａは、下側外装部１２における積層方向に垂直な面である。ダミー層２３は、シール樹脂層２２と接触している。   Between the inner wall surface 13a of the top plate portion 13 of the upper exterior portion 11 and the upper end surface 2a of the laminate 2 and between the inner wall surface 16a of the bottom plate portion 16 of the lower exterior portion 12 and the lower end surface 2b of the laminate 2 , Dummy layers 23 are respectively arranged. That is, the dummy layer 23 is disposed between the top plate portion 13 of the upper exterior portion 11 and the bottom plate portion 16 of the lower exterior portion 12 and the uppermost layer and the lowermost layer negative electrode 4 of the laminate 2, respectively. The inner wall surface 13a is a surface of the upper exterior part 11 that is perpendicular to the laminating direction. The inner wall surface 16a is a surface perpendicular to the laminating direction in the lower exterior part 12. The dummy layer 23 is in contact with the sealing resin layer 22.

ダミー層２３は、例えば樹脂製の平板で形成されている。ダミー層２３は、平面視矩形状を呈している。積層方向から見たダミー層２３の外形寸法は、積層方向から見た負極４及び正極５の外形寸法よりも大きい。外形寸法は、Ｘ軸方向及びＹ軸方向の寸法である。また、ダミー層２３の厚みは、ラミネートフィルム３の厚みよりも大きい。   The dummy layer 23 is formed of, for example, a flat plate made of resin. The dummy layer 23 has a rectangular shape in plan view. The outer dimensions of the dummy layer 23 as viewed from the laminating direction are larger than the outer dimensions of the negative electrode 4 and the positive electrode 5 as viewed from the laminating direction. The external dimensions are dimensions in the X-axis direction and the Y-axis direction. Further, the thickness of the dummy layer 23 is larger than the thickness of the laminate film 3.

ダミー層２３の縁部は、ラミネートフィルム３の屈曲部に位置している。つまり、上側のダミー層２３の縁部は、上側外装部１１における天板部分１３と側板部分１４との境界部に位置している。下側のダミー層２３の縁部は、下側外装部１２における底板部分１６と側板部分１７との境界部に位置している。このとき、ダミー層２３の縁部は、積層方向の内側に曲がっていない。   The edge of the dummy layer 23 is located at the bent portion of the laminate film 3. That is, the edge of the upper dummy layer 23 is located at the boundary between the top plate portion 13 and the side plate portion 14 in the upper exterior portion 11. The edge of the lower dummy layer 23 is located at the boundary between the bottom plate portion 16 and the side plate portion 17 in the lower exterior portion 12. At this time, the edge of the dummy layer 23 is not bent inward in the stacking direction.

ダミー層２３のラミネートフィルム３側の主面２３ａの縁部には、図３に示されるように、面取り２４が設けられている。面取り２４は、平坦状となっていてもよいし、Ｒ状となっていてもよい。   As shown in FIG. 3, a chamfer 24 is provided at the edge of the main surface 23a of the dummy layer 23 on the laminate film 3 side. The chamfer 24 may have a flat shape or an R shape.

ダミー層２３を形成する樹脂としては、ポリプロピレン、ポリエチレン、ポリフェニレンサルファイド（ＰＰＳ）または四フッ化エチレン・パーフルオロアルコキシエチレン共重合樹脂（ＰＦＡ）等が挙げられる。   Examples of the resin forming the dummy layer 23 include polypropylene, polyethylene, polyphenylene sulfide (PPS), and ethylene tetrafluoride / perfluoroalkoxyethylene copolymer resin (PFA).

ところで、ラミネートフィルム３の上側外装部１１において天板部分１３に対する側板部分１４の角度が垂直に近くなるほど、側板部分１４と積層体２との距離が短くなるため、上側外装部１１の外側を流れる空気によって積層体２が冷却されやすくなる。しかし、上側外装部１１において天板部分１３に対する側板部分１４の角度が垂直に近くなるほど、蓄電装置１に外部からの応力が加わったときに、積層体２の最上層に位置する負極４の縁部が外部からの応力を受けやすく、当該負極４が損傷するおそれがある。同様に、ラミネートフィルム３の下側外装部１２において底板部分１６に対する側板部分１７の角度が垂直に近くなるほど、蓄電装置１に外部からの応力が加わったときに、積層体２の最下層に位置する負極４の縁部が外部からの応力を受けやすく、当該負極４が損傷するおそれがある。   By the way, as the angle of the side plate portion 14 with respect to the top plate portion 13 in the upper exterior portion 11 of the laminate film 3 becomes closer to the vertical, the distance between the side plate portion 14 and the laminate 2 becomes shorter, so that the outer side of the upper exterior portion 11 flows. The laminate 2 is easily cooled by the air. However, as the angle of the side plate portion 14 with respect to the top plate portion 13 in the upper exterior portion 11 becomes closer to the vertical, when an external stress is applied to the power storage device 1, the edge of the negative electrode 4 located on the uppermost layer of the laminate 2 The part is easily affected by external stress, and the negative electrode 4 may be damaged. Similarly, as the angle of the side plate portion 17 with respect to the bottom plate portion 16 in the lower exterior portion 12 of the laminate film 3 becomes closer to the vertical, when an external stress is applied to the power storage device 1, The edge portion of the negative electrode 4 is likely to receive an external stress, and the negative electrode 4 may be damaged.

そのような不具合に対し、本実施形態では、上側外装部１１における積層方向に垂直な内壁面１３ａと積層体２の上端面２ａとの間、及び下側外装部１２における積層方向に垂直な内壁面１６ａと積層体２の下端面２ｂとの間には、ダミー層２３がそれぞれ配置されており、積層方向から見たダミー層２３の外形寸法は、積層方向から見た負極４及び正極５の外形寸法よりも大きい。従って、蓄電装置１に外部からの応力が加わったときには、外部からの応力をダミー層２３が受けることになるため、積層体２における最外層の負極４の縁部が外部からの応力を受けにくい。これにより、積層体２における最外層の負極４の損傷が防止される。   In order to deal with such a problem, in the present embodiment, the inner wall 13a of the upper exterior unit 11 perpendicular to the lamination direction and the upper end surface 2a of the laminate 2 and the inner wall 13a of the lower exterior unit 12 perpendicular to the lamination direction are provided. Dummy layers 23 are respectively arranged between the wall surface 16a and the lower end surface 2b of the multilayer body 2, and the outer dimensions of the dummy layers 23 viewed from the laminating direction are the same as those of the negative electrode 4 and the positive electrode 5 viewed from the laminating direction. Larger than external dimensions. Therefore, when an external stress is applied to the power storage device 1, the external stress is applied to the dummy layer 23, so that the edge of the outermost layer of the negative electrode 4 in the stacked body 2 is less likely to receive the external stress. . This prevents the outermost negative electrode 4 in the laminate 2 from being damaged.

また、本実施形態では、ダミー層２３のラミネートフィルム３側の主面２３ａの縁部には面取り２４が設けられているので、蓄電装置１に外部からの応力が加わったときに、ダミー層２３の縁部が積層方向の内側に曲がりにくくなると共に、ラミネートフィルム３の曲げ部に亀裂が生じにくくなる。ラミネートフィルム３への亀裂の発生が抑えられることで、外部とのシール性が十分に確保されるため、蓄電装置１内に空気、水分または異物等が入ることが確実に防止される。   Further, in the present embodiment, since the chamfer 24 is provided at the edge of the main surface 23 a of the dummy layer 23 on the laminate film 3 side, when the external stress is applied to the power storage device 1, the dummy layer 23 Of the laminate film 3 is less likely to bend inward in the laminating direction, and cracks are less likely to occur in the bent portion of the laminate film 3. Since the occurrence of cracks in the laminated film 3 is suppressed, the sealing performance with the outside is sufficiently ensured, so that air, moisture, foreign matter, or the like can be reliably prevented from entering the power storage device 1.

また、本実施形態では、ダミー層２３の厚みはラミネートフィルム３の厚みよりも大きいので、ダミー層２３は外部からの応力を十分に受けることができる。   In the present embodiment, since the thickness of the dummy layer 23 is larger than the thickness of the laminate film 3, the dummy layer 23 can sufficiently receive external stress.

なお、本発明は、上記実施形態には限定されない。例えば上記実施形態では、ダミー層２３の厚みがラミネートフィルム３の厚みよりも大きくなっているが、特にその形態には限られず、ダミー層２３の厚みがラミネートフィルム３の厚みと等しくてもよいし、ダミー層２３の厚みがラミネートフィルム３の厚みよりも小さくてもよい。   Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, the thickness of the dummy layer 23 is larger than the thickness of the laminate film 3, but the present invention is not particularly limited to this, and the thickness of the dummy layer 23 may be equal to the thickness of the laminate film 3. Alternatively, the thickness of the dummy layer 23 may be smaller than the thickness of the laminate film 3.

また、上記実施形態では、ラミネートフィルム３を構成する上側外装部１１及び下側外装部１２は、何れも断面略Ｕ字状を呈しているが、特にその形態には限られず、上側外装部１１及び下側外装部１２の何れか一方のみが断面略Ｕ字状を呈しており、上側外装部１１及び下側外装部１２の他方が平板状または略平板状になっていてもよい。上側外装部１１のみが断面略Ｕ字状を呈している場合は、上側外装部１１における積層方向に垂直な内壁面１３ａと積層体２の上端面２ａとの間のみにダミー層２３が配置されていればよい。下側外装部１２のみが断面略Ｕ字状を呈している場合は、下側外装部１２における積層方向に垂直な内壁面１６ａと積層体２の下端面２ｂとの間のみにダミー層２３が配置されていればよい。   Further, in the above embodiment, the upper exterior part 11 and the lower exterior part 12 constituting the laminate film 3 each have a substantially U-shaped cross section. However, the present invention is not particularly limited to this. Only one of the upper and lower outer portions 12 may have a substantially U-shaped cross section, and the other of the upper and lower outer portions 11 and 12 may have a flat plate shape or a substantially flat plate shape. When only the upper exterior portion 11 has a substantially U-shaped cross section, the dummy layer 23 is disposed only between the inner wall surface 13a of the upper exterior portion 11 perpendicular to the laminating direction and the upper end surface 2a of the multilayer body 2. It should just be. When only the lower exterior part 12 has a substantially U-shaped cross section, the dummy layer 23 is provided only between the inner wall surface 16a of the lower exterior part 12 perpendicular to the laminating direction and the lower end face 2b of the multilayer body 2. It is sufficient if they are arranged.

１…蓄電装置、２…積層体、２ａ…上端面、２ｂ…下端面、３…ラミネートフィルム（外装部材）、４…負極（電極）、５…正極（電極）、６…負極集電板（集電板）、７…正極集電板（集電板）、９…負極タブ（タブ）、１０…正極タブ（タブ）、１１…上側外装部（第１外装部）、１２…下側外装部（第２外装部）、１３ａ…内壁面、１６ａ…内壁面、２３…ダミー層、２３ａ…主面、２４…面取り。   DESCRIPTION OF SYMBOLS 1 ... Power storage device, 2 ... laminated body, 2a ... upper end surface, 2b ... lower end surface, 3 ... laminated film (exterior member), 4 ... negative electrode (electrode), 5 ... positive electrode (electrode), 6 ... negative electrode current collector plate ( Current collector plate), 7: positive electrode current collector plate (current collector plate), 9: negative electrode tab (tab), 10: positive electrode tab (tab), 11: upper exterior part (first exterior part), 12: lower exterior part Part (second exterior part), 13a ... inner wall surface, 16a ... inner wall surface, 23 ... dummy layer, 23a ... main surface, 24 ... chamfer.

Claims (4)

電極及び集電板が積層されてなる積層体と、
前記積層体を覆う外装部材と、
前記集電板と電気的に接続され、前記外装部材の外部に取り出されるタブとを備え、
前記外装部材は、前記積層体の積層方向に互いに対向するように配置された第１外装部及び第２外装部を有し、
前記第１外装部及び前記第２外装部の少なくとも一方は、断面略Ｕ字状を呈し、
前記第１外装部及び前記第２外装部の少なくとも一方における前記積層方向に垂直な内壁面と前記積層体の前記積層方向の端面との間には、ダミー層が配置されており、
前記積層方向から見た前記ダミー層の外形寸法は、前記積層方向から見た前記電極の外形寸法よりも大きい蓄電装置。 A laminate in which the electrodes and the current collector are laminated,
An exterior member that covers the laminate,
A tab that is electrically connected to the current collector plate and that is taken out of the exterior member;
The exterior member has a first exterior portion and a second exterior portion that are arranged to face each other in a stacking direction of the laminate,
At least one of the first exterior part and the second exterior part has a substantially U-shaped cross section,
A dummy layer is arranged between an inner wall surface of at least one of the first exterior part and the second exterior part perpendicular to the lamination direction and an end face of the laminate in the lamination direction,
The power storage device, wherein an outer dimension of the dummy layer viewed from the stacking direction is larger than an outer dimension of the electrode viewed from the stacking direction. 前記第１外装部及び前記第２外装部は、何れも断面略Ｕ字状を呈し、
前記ダミー層は、前記第１外装部及び前記第２外装部における前記積層方向に垂直な内壁面と前記積層体の前記積層方向の両端面との間にそれぞれ配置されている請求項１記載の蓄電装置。 Each of the first exterior part and the second exterior part has a substantially U-shaped cross section,
2. The device according to claim 1, wherein the dummy layer is disposed between an inner wall surface of the first exterior portion and the second exterior portion perpendicular to the lamination direction and both end surfaces of the laminate in the lamination direction. 3. Power storage device. 前記ダミー層の前記外装部材側の主面の縁部には、面取りが設けられている請求項１または２記載の蓄電装置。   The power storage device according to claim 1, wherein a chamfer is provided at an edge of the main surface of the dummy layer on the exterior member side. 前記ダミー層の厚みは、前記外装部材の厚みよりも大きい請求項１〜３の何れか一項記載の蓄電装置。   The power storage device according to claim 1, wherein a thickness of the dummy layer is greater than a thickness of the exterior member.
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