JP6780345B2 - Power storage device and manufacturing method of power storage device - Google Patents

Power storage device and manufacturing method of power storage device Download PDF

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JP6780345B2
JP6780345B2 JP2016148473A JP2016148473A JP6780345B2 JP 6780345 B2 JP6780345 B2 JP 6780345B2 JP 2016148473 A JP2016148473 A JP 2016148473A JP 2016148473 A JP2016148473 A JP 2016148473A JP 6780345 B2 JP6780345 B2 JP 6780345B2
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resin member
current collector
bipolar electrodes
storage device
power storage
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JP2018018698A (en
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真也 奥田
真也 奥田
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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
    • 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

Description

本発明は、蓄電装置及び蓄電装置の製造方法に関する。 The present invention relates to a power storage device and a method for manufacturing the power storage device.

集電体の一方の面に正極が形成され、他方の面に負極が形成されたバイポーラ電極を備えるバイポーラ電池が知られている。バイポーラ電池では、電解質層を挟んで複数のバイポーラ電極が直列に積層されている。 A bipolar battery including a bipolar electrode having a positive electrode formed on one surface of a current collector and a negative electrode formed on the other surface is known. In a bipolar battery, a plurality of bipolar electrodes are laminated in series with an electrolyte layer interposed therebetween.

例えば特許文献１に開示されたバイポーラ電池では、ポリプロピレン層が、ニッケルなどの金属を使用したバイポーラプレート（集電体）の周辺を覆っている。そして、ポリプロピレン層と、複数の集電体を支持するためのポリプロピレン製のセルケーシング（支持部材）とが一体成形により固着されている。これにより、集電体と支持部材との密着性が高められる。 For example, in the bipolar battery disclosed in Patent Document 1, a polypropylene layer covers the periphery of a bipolar plate (current collector) using a metal such as nickel. Then, the polypropylene layer and the polypropylene cell casing (support member) for supporting the plurality of current collectors are fixed by integral molding. As a result, the adhesion between the current collector and the support member is enhanced.

特開２００５―１３５７６４号公報Japanese Unexamined Patent Publication No. 2005-135764

集電体と支持部材とを溶着したり、バイポーラ電池を充放電させたりすると、発熱によって集電体及び支持部材が膨張する。集電体の熱膨張係数と支持部材の熱膨張係数とが異なるので、集電体と支持部材との間で剥離が生じるおそれがある。 When the current collector and the support member are welded or the bipolar battery is charged and discharged, the current collector and the support member expand due to heat generation. Since the coefficient of thermal expansion of the current collector and the coefficient of thermal expansion of the support member are different, there is a possibility that peeling may occur between the current collector and the support member.

本発明の一側面は、集電体と支持部材との間の剥離を抑制することが可能な蓄電装置及び蓄電装置の製造方法を提供することを目的とする。 One aspect of the present invention is to provide a power storage device and a method for manufacturing a power storage device capable of suppressing peeling between a current collector and a support member.

本発明の一側面に係る蓄電装置は、積層された複数のバイポーラ電極であり、複数のバイポーラ電極のそれぞれが、第１の面及び第１の面とは反対側の第２の面を有する集電体と、第１の面に設けられた正極層と、第２の面に設けられた負極層とを有している、複数のバイポーラ電極と、集電体の外周部の少なくとも一部において、第１の面及び第２の面の少なくとも一方の面上に設けられた第１の樹脂部材と、第１の樹脂部材上に設けられ、第１の樹脂部材を介して集電体の外周部を支持する第２の樹脂部材と、を備え、第１の樹脂部材の熱膨張係数は、集電体の熱膨張係数と第２の樹脂部材の熱膨張係数との間の値である。 The power storage device according to one aspect of the present invention is a plurality of laminated bipolar electrodes, each of which has a first surface and a second surface opposite to the first surface. A plurality of bipolar electrodes having an electric body, a positive electrode layer provided on the first surface, and a negative electrode layer provided on the second surface, and at least a part of the outer peripheral portion of the current collector. , A first resin member provided on at least one of the first surface and the second surface, and an outer circumference of the current collector provided on the first resin member and via the first resin member. A second resin member that supports the portion is provided, and the coefficient of thermal expansion of the first resin member is a value between the coefficient of thermal expansion of the current collector and the coefficient of thermal expansion of the second resin member.

上記の蓄電装置では、第１の樹脂部材上に設けられた第２の樹脂部材が、第１の樹脂部材を介して集電体の外周部を支持するので、第２の樹脂部材が支持部材として機能する。ここで、第１の樹脂部材の熱膨張係数は、集電体の熱膨張係数と第２の樹脂部材の熱膨張係数との間の値である。この場合、集電体及び第１の樹脂部材の熱膨張係数の差と、第１の樹脂部材及び第２の樹脂部材の熱膨張係数の差は、いずれも、集電体及び第２の樹脂部材の熱膨張係数の差よりも小さくなる。その結果、例えば、第１の樹脂部材及び第２の樹脂部材の熱膨張係数が同じ場合、又は、第１の樹脂部材を介さずに第２の樹脂部材によって直接集電体の外周部を支持する場合よりも、集電体と第２の樹脂部材（つまり支持部材）との間の剥離が抑制される。 In the above power storage device, the second resin member provided on the first resin member supports the outer peripheral portion of the current collector via the first resin member, so that the second resin member supports the support member. Functions as. Here, the coefficient of thermal expansion of the first resin member is a value between the coefficient of thermal expansion of the current collector and the coefficient of thermal expansion of the second resin member. In this case, the difference in the coefficient of thermal expansion between the current collector and the first resin member and the difference in the coefficient of thermal expansion between the first resin member and the second resin member are both the difference between the current collector and the second resin. It is smaller than the difference in the coefficient of thermal expansion of the members. As a result, for example, when the thermal expansion coefficients of the first resin member and the second resin member are the same, or the outer peripheral portion of the current collector is directly supported by the second resin member without going through the first resin member. The peeling between the current collector and the second resin member (that is, the support member) is suppressed as compared with the case where.

第１の樹脂部材は、絶縁性を有していてもよい。これにより、例えば、集電体の第１の面に設けられた正極層と、第２の面に設けられた負極層とが、集電体の外周部のうちの第１の樹脂部材が設けられた部分を経由して電気的に接続される（短絡が生じる）可能性を低減することができる。 The first resin member may have an insulating property. As a result, for example, the positive electrode layer provided on the first surface of the current collector and the negative electrode layer provided on the second surface are provided with the first resin member in the outer peripheral portion of the current collector. It is possible to reduce the possibility of being electrically connected (short circuit occurs) via the connected portion.

第１の樹脂部材は、集電体の第１の面及び第２の面の両方の面上に設けられていてもよい。これにより、集電体の両方の面において、集電体と第２の樹脂部材との間の剥離を抑制することができる。 The first resin member may be provided on both the first surface and the second surface of the current collector. As a result, peeling between the current collector and the second resin member can be suppressed on both surfaces of the current collector.

第１の樹脂部材の厚みは、正極層の厚み及び負極層の厚みのいずれの厚みよりも大きくてもよい。これにより、例えば、上述のように第１の樹脂部材が集電体の第１の面及び第２の面の両方の面に設けられている場合には、複数のバイポーラ電極の積層方向において隣り合うバイポーラ電極の集電体に設けられた正極層と負極層との間隔を確保することができる。 The thickness of the first resin member may be larger than either the thickness of the positive electrode layer or the thickness of the negative electrode layer. As a result, for example, when the first resin member is provided on both the first surface and the second surface of the current collector as described above, the plurality of bipolar electrodes are adjacent to each other in the stacking direction. It is possible to secure a distance between the positive electrode layer and the negative electrode layer provided in the current collector of the matching bipolar electrodes.

複数のバイポーラ電極の積層方向において隣り合うバイポーラ電極のそれぞれの第１の樹脂部材同士は、接触していてもよい。これにより、第１の樹脂部材の厚みを利用して集電体同士の間隔を定めることができる。 The first resin members of the bipolar electrodes adjacent to each other in the stacking direction of the plurality of bipolar electrodes may be in contact with each other. Thereby, the distance between the current collectors can be determined by utilizing the thickness of the first resin member.

本発明の一側面に係る蓄電池装置の製造方法は、複数のバイポーラ電極を準備する工程であり、複数のバイポーラ電極のそれぞれが、第１の面及び第１の面とは反対側の第２の面を有する集電体と、第１の面に設けられた正極層と、第２の面に設けられた負極層とを有している、工程と、集電体の外周部の少なくとも一部において、第１の面及び第２の面の少なくとも一方の面上に第１の樹脂部材を設ける工程と、第１の樹脂部材を設ける工程の後に、複数のバイポーラ電極を積層する工程と、第１の樹脂部材上に、第１の樹脂部材を介して集電体の外周部を支持する第２の樹脂部材を設ける工程と、を含み、第１の樹脂部材の熱膨張係数は、集電体の熱膨張係数と第２の樹脂部材の熱膨張係数との間の値である。 The method for manufacturing a storage battery device according to one aspect of the present invention is a step of preparing a plurality of bipolar electrodes, each of the plurality of bipolar electrodes having a first surface and a second surface opposite to the first surface. A process having a current collector having a surface, a positive electrode layer provided on the first surface, and a negative electrode layer provided on the second surface, and at least a part of the outer peripheral portion of the current collector. In the step of providing the first resin member on at least one of the first surface and the second surface, and the step of laminating a plurality of bipolar electrodes after the step of providing the first resin member. The thermal expansion coefficient of the first resin member includes a step of providing a second resin member that supports the outer peripheral portion of the current collector via the first resin member on the resin member 1. It is a value between the thermal expansion coefficient of the body and the thermal expansion coefficient of the second resin member.

上記の蓄電装置の製造方法でも、第１の樹脂部材の熱膨張係数は集電体の熱膨張係数と第２の樹脂部材の熱膨張係数との間の値であるので、集電体と第２の樹脂部材（つまり支持部材）との剥離が抑制される。また、集電体の外周部の少なくとも一部において、第１の面及び第２の面の少なくとも一方の面上に第１の樹脂部材を設けた後に、複数のバイポーラ電極を積層する。これにより、複数のバイポーラ電極を積層する際に、それぞれのバイポーラ電極の集電体に設けられた第１の樹脂部材を、集電体同士の相対的な位置決めに利用することもできる。 Even in the above method for manufacturing the power storage device, the coefficient of thermal expansion of the first resin member is a value between the coefficient of thermal expansion of the current collector and the coefficient of thermal expansion of the second resin member. The peeling from the resin member (that is, the support member) of 2 is suppressed. Further, a plurality of bipolar electrodes are laminated after providing the first resin member on at least one surface of the first surface and the second surface on at least a part of the outer peripheral portion of the current collector. As a result, when stacking a plurality of bipolar electrodes, the first resin member provided in the current collector of each bipolar electrode can be used for relative positioning between the current collectors.

第１の樹脂部材を設ける工程では、第１の面及び第２の面の両方の面上に第１の樹脂部材が設けられ、積層する工程では、セパレータを介して複数のバイポーラ電極が積層され、複数のバイポーラ電極の積層方向において隣り合うバイポーラ電極のそれぞれの第１の樹脂部材同士が接触しており、複数のバイポーラ電極の積層方向から見たときに、セパレータが第１の樹脂部材の内側に位置していてもよい。この場合、積層方向において隣り合うバイポーラ電極のそれぞれの第１の樹脂部材同士が接触しているので、第１の樹脂部材の厚みを利用して集電体同士の間隔を定めることができる。また、積層方向から見たときに、セパレータが第１の樹脂部材の内側に位置しているので、第１の樹脂部材を利用してセパレータの位置決めを行うこともできる。 In the step of providing the first resin member, the first resin member is provided on both the first surface and the second surface, and in the step of laminating, a plurality of bipolar electrodes are laminated via the separator. , The first resin members of the adjacent bipolar electrodes are in contact with each other in the stacking direction of the plurality of bipolar electrodes, and the separator is inside the first resin member when viewed from the stacking direction of the plurality of bipolar electrodes. It may be located in. In this case, since the first resin members of the adjacent bipolar electrodes are in contact with each other in the stacking direction, the distance between the current collectors can be determined by utilizing the thickness of the first resin member. Further, since the separator is located inside the first resin member when viewed from the stacking direction, the separator can be positioned by using the first resin member.

本発明の一側面によれば、集電体と支持部材との間の剥離を抑制することが可能な蓄電装置及び蓄電装置の製造方法が提供される。 According to one aspect of the present invention, there is provided a power storage device and a method for manufacturing a power storage device capable of suppressing peeling between a current collector and a support member.

実施形態に係る蓄電装置を模式的に示す断面図である。It is sectional drawing which shows typically the power storage device which concerns on embodiment. 実施形態に係る蓄電装置の一部を模式的に示す分解斜視図である。It is an exploded perspective view which shows a part of the power storage device which concerns on embodiment schematically. 第１の樹脂部材及び第２の樹脂部材の拡大断面図である。It is an enlarged sectional view of the 1st resin member and the 2nd resin member. 変形例に係る第１の樹脂部材及び第２の樹脂部材の拡大断面図である。It is an enlarged sectional view of the 1st resin member and the 2nd resin member which concerns on a modification. 実施形態に係る蓄電装置の製造方法の一工程を示す断面図である。It is sectional drawing which shows one step of the manufacturing method of the power storage device which concerns on embodiment. 実施形態に係る蓄電装置の製造方法の一工程を示す断面図である。It is sectional drawing which shows one step of the manufacturing method of the power storage device which concerns on embodiment. 実施形態に係る蓄電装置の製造方法の一工程を示す断面図である。It is sectional drawing which shows one step of the manufacturing method of the power storage device which concerns on embodiment.

以下、添付図面を参照しながら本発明の実施形態が詳細に説明される。図面の説明において、同一又は同等の要素には同一符号が用いられ、重複する説明は省略される。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate description is omitted.

図１は、実施形態に係る蓄電装置を模式的に示す断面図である。図２は、実施形態に係る蓄電装置の一部を模式的に示す分解斜視図である。図１及び図２にはＸＹＺ直交座標系が示される。図１に示される蓄電装置１０は、例えばニッケル水素二次電池、リチウムイオン二次電池等の二次電池であってもよいし、電気二重層キャパシタであってもよい。蓄電装置１０は、例えばフォークリフト、ハイブリッド自動車、電気自動車等の車両に搭載され得る。 FIG. 1 is a cross-sectional view schematically showing a power storage device according to an embodiment. FIG. 2 is an exploded perspective view schematically showing a part of the power storage device according to the embodiment. 1 and 2 show an XYZ Cartesian coordinate system. The power storage device 10 shown in FIG. 1 may be a secondary battery such as a nickel hydrogen secondary battery or a lithium ion secondary battery, or may be an electric double layer capacitor. The power storage device 10 can be mounted on a vehicle such as a forklift, a hybrid vehicle, or an electric vehicle.

蓄電装置１０は、複数のバイポーラ電極１２を備える。複数のバイポーラ電極１２は、セパレータ１４を介して直列に積層される。複数のバイポーラ電極１２のそれぞれは、第１の面１６ａ及び第１の面１６ａとは反対側の第２の面１６ｂを有する集電体１６と、第１の面１６ａに設けられた正極層１８と、第２の面１６ｂに設けられた負極層２０とを有している。正極層１８及び負極層２０は、複数のバイポーラ電極１２の積層方向（以下、Ｚ軸方向ともいう）に交差する平面（例えばＸＹ平面）に沿って延在している。 The power storage device 10 includes a plurality of bipolar electrodes 12. The plurality of bipolar electrodes 12 are laminated in series via the separator 14. Each of the plurality of bipolar electrodes 12 has a current collector 16 having a first surface 16a and a second surface 16b opposite to the first surface 16a, and a positive electrode layer 18 provided on the first surface 16a. And a negative electrode layer 20 provided on the second surface 16b. The positive electrode layer 18 and the negative electrode layer 20 extend along a plane (for example, an XY plane) intersecting the stacking direction (hereinafter, also referred to as the Z-axis direction) of the plurality of bipolar electrodes 12.

セパレータ１４はシート状であってもよいし、袋状であってもよい。セパレータ１４は例えば多孔膜又は不織布である。セパレータ１４は電解液を透過させ得る。セパレータ１４の材料としては、例えばポリエチレン、ポリプロピレン等のポリオレフィン、ポリイミド、アラミド繊維などポリアミド系等が挙げられる。また、フッ化ビニリデン樹脂化合物で補強されたセパレータ１４が使用されてもよい。電解液としては、例えば水酸化カリウム水溶液等のアルカリ溶液が使用され得る。 The separator 14 may have a sheet shape or a bag shape. The separator 14 is, for example, a porous membrane or a non-woven fabric. The separator 14 can permeate the electrolytic solution. Examples of the material of the separator 14 include polyolefins such as polyethylene and polypropylene, and polyamide-based materials such as polyimide and aramid fibers. Further, a separator 14 reinforced with a vinylidene fluoride resin compound may be used. As the electrolytic solution, an alkaline solution such as an aqueous potassium hydroxide solution can be used.

集電体１６は、例えばニッケル箔等の金属箔であってもよいし、例えば導電性樹脂フィルム等の導電性樹脂部材であってもよい。集電体１６の厚みは、例えば０．１〜１０００μｍである。正極層１８は、正極活物質を含む。蓄電装置１０がニッケル水素二次電池の場合、正極活物質は、例えば水酸化ニッケル（Ｎｉ（ＯＨ）２）の粒子である。蓄電装置１０がリチウムイオン二次電池の場合、正極活物質は、例えば複合酸化物、金属リチウム、硫黄等である。負極層２０は、負極活物質を含む。蓄電装置１０がニッケル水素二次電池の場合、負極活物質は、例えば水素吸蔵合金の粒子である。蓄電装置１０がリチウムイオン二次電池の場合、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、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、ＳｉＯｘ（０．５≦ｘ≦１．５）等の金属酸化物、ホウ素添加炭素等である。 The current collector 16 may be, for example, a metal foil such as a nickel foil, or may be a conductive resin member such as a conductive resin film. The thickness of the current collector 16 is, for example, 0.1 to 1000 μm. The positive electrode layer 18 contains a positive electrode active material. When the power storage device 10 is a nickel-hydrogen secondary battery, the positive electrode active material is, for example, nickel hydroxide (Ni (OH) 2) particles. When the power storage device 10 is a lithium ion secondary battery, the positive electrode active material is, for example, a composite oxide, metallic lithium, sulfur, or the like. The negative electrode layer 20 contains a negative electrode active material. When the power storage device 10 is a nickel-metal hydride secondary battery, the negative electrode active material is, for example, particles of a hydrogen storage alloy. When the power storage device 10 is a lithium ion secondary battery, the negative electrode active material includes, for example, graphite, highly oriented graphite, mesocarbon microbeads, carbon such as hard carbon and soft carbon, alkali metals such as lithium and sodium, and metal compounds. Metal oxides such as SiOx (0.5 ≦ x ≦ 1.5), carbon with added boron, and the like.

Ｚ軸方向において、複数のバイポーラ電極１２及び複数のセパレータ１４は、電極１１２及び電極２１２によって挟まれてもよい。電極１１２及び電極２１２は、Ｚ軸方向において最も外側に位置する電極である。電極１１２は、集電体１１６と、集電体１１６のセパレータ１４側の面に設けられた正極層１８とを備える。電極２１２は、集電体１１６と、集電体１１６のセパレータ１４側の面に設けられた負極層２０とを備える。集電体１１６は、Ｚ軸方向において集電体１６よりも厚いこと以外は集電体１６と同じ構成を備える。 In the Z-axis direction, the plurality of bipolar electrodes 12 and the plurality of separators 14 may be sandwiched between the electrodes 112 and 212. The electrode 112 and the electrode 212 are electrodes located on the outermost side in the Z-axis direction. The electrode 112 includes a current collector 116 and a positive electrode layer 18 provided on the surface of the current collector 116 on the separator 14 side. The electrode 212 includes a current collector 116 and a negative electrode layer 20 provided on the surface of the current collector 116 on the separator 14 side. The current collector 116 has the same configuration as the current collector 16 except that it is thicker than the current collector 16 in the Z-axis direction.

蓄電装置１０は、樹脂部材２８（第１の樹脂部材）及び絶縁ケース３０（第２の樹脂部材）を備えている。樹脂部材２８は、集電体１６の外周部１６１（後述の図３参照）に設けられる。絶縁ケース３０は、樹脂部材２８を介して、複数のバイポーラ電極を支持する樹脂ケースである。絶縁ケース３０は、例えばポリパラフェニレンベンゾビスオキサゾール（ザイロン（登録商標））製のケースである。絶縁ケース３０は、電極１１２及び電極２１２を支持してもよい。絶縁ケース３０は、複数のバイポーラ電極１２及び複数のセパレータ１４を収容し得る筒状部材であってもよい。絶縁ケース３０内には電解液が充填される。樹脂部材２８、及び絶縁ケース３０の詳細については、後に図３を参照して改めて説明する。 The power storage device 10 includes a resin member 28 (first resin member) and an insulating case 30 (second resin member). The resin member 28 is provided on the outer peripheral portion 161 of the current collector 16 (see FIG. 3 described later). The insulating case 30 is a resin case that supports a plurality of bipolar electrodes via a resin member 28. The insulating case 30 is, for example, a case made of polyparaphenylene benzobisoxazole (Zylon (registered trademark)). The insulating case 30 may support the electrodes 112 and 212. The insulating case 30 may be a tubular member capable of accommodating a plurality of bipolar electrodes 12 and a plurality of separators 14. The insulating case 30 is filled with an electrolytic solution. Details of the resin member 28 and the insulating case 30 will be described later with reference to FIG.

蓄電装置１０は、正極プレート４０及び負極プレート５０を備えてもよい。正極プレート４０及び負極プレート５０は、Ｚ軸方向において、複数のバイポーラ電極１２及び複数のセパレータ１４を挟持する。正極プレート４０及び負極プレート５０は、電極１１２、電極２１２及び絶縁ケース３０を挟持してもよい。電極１１２は正極プレート４０とセパレータ１４との間に配置される。電極２１２は負極プレート５０とセパレータ１４との間に配置される。正極プレート４０には正極端子４２が接続される。負極プレート５０には負極端子５２が接続される。正極端子４２及び負極端子５２により蓄電装置１０の充放電を行うことができる。 The power storage device 10 may include a positive electrode plate 40 and a negative electrode plate 50. The positive electrode plate 40 and the negative electrode plate 50 sandwich a plurality of bipolar electrodes 12 and a plurality of separators 14 in the Z-axis direction. The positive electrode plate 40 and the negative electrode plate 50 may sandwich the electrode 112, the electrode 212, and the insulating case 30. The electrode 112 is arranged between the positive electrode plate 40 and the separator 14. The electrode 212 is arranged between the negative electrode plate 50 and the separator 14. A positive electrode terminal 42 is connected to the positive electrode plate 40. The negative electrode terminal 52 is connected to the negative electrode plate 50. The positive electrode terminal 42 and the negative electrode terminal 52 can charge and discharge the power storage device 10.

正極プレート４０及び負極プレート５０には、Ｚ軸方向に延びるボルトＢを貫通するための貫通孔が設けられる。貫通孔は、Ｚ軸方向から見て絶縁ケース３０の外側に配置される。ボルトＢは正極プレート４０から負極プレート５０に向かって挿通され得る。ボルトＢの先端にはナットＮが螺合される。これにより、正極プレート４０及び負極プレート５０は、複数のバイポーラ電極１２、複数のセパレータ１４、電極１１２、電極２１２及び絶縁ケース３０を拘束できる。その結果、絶縁ケース３０内は密封され得る。 The positive electrode plate 40 and the negative electrode plate 50 are provided with through holes for penetrating the bolt B extending in the Z-axis direction. The through hole is arranged outside the insulating case 30 when viewed from the Z-axis direction. The bolt B can be inserted from the positive electrode plate 40 toward the negative electrode plate 50. A nut N is screwed into the tip of the bolt B. As a result, the positive electrode plate 40 and the negative electrode plate 50 can restrain the plurality of bipolar electrodes 12, the plurality of separators 14, the electrodes 112, the electrodes 212, and the insulating case 30. As a result, the inside of the insulating case 30 can be sealed.

図３は、樹脂部材２８及び絶縁ケース３０の拡大断面図である。樹脂部材２８は、集電体１６の外周部１６１の少なくとも一部に設けられる。樹脂部材２８は、外周部１６１全体にわたって環状に設けられてもよい。樹脂部材２８は、集電体１６の第１の面１６ａ及び第２の面１６ｂの少なくとも一方の面上に設けられている。図３に示される例では、樹脂部材２８は、集電体１６の第１の面１６ａ及び第２の面１６ｂの両方の面上に設けられている。樹脂部材２８は、集電体１６の第１の面１６ａに接触する接触面２８ａと、集電体１６の第２の面１６ｂに接触する接触面２８ｂとを有している。樹脂部材２８は、集電体１６の端面１６ｃ上にも設けられてよく、この場合、樹脂部材２８は、集電体１６の端面１６ｃに接触する接触面２８ｃも有する。端面１６ｃは、第１の面１６ａと第２の面１６ｂとを繋ぐ面である。接触面２８ｃは、接触面２８ａと接触面２８ｂとを繋ぐ面である。樹脂部材２８は、集電体１６の外周部１６１を覆うように、集電体１６の外周方向（図３に示される部分ではＹ軸方向）に直交する方向から見て、断面Ｕ字形状を有する。 FIG. 3 is an enlarged cross-sectional view of the resin member 28 and the insulating case 30. The resin member 28 is provided on at least a part of the outer peripheral portion 161 of the current collector 16. The resin member 28 may be provided in an annular shape over the entire outer peripheral portion 161. The resin member 28 is provided on at least one of the first surface 16a and the second surface 16b of the current collector 16. In the example shown in FIG. 3, the resin member 28 is provided on both the first surface 16a and the second surface 16b of the current collector 16. The resin member 28 has a contact surface 28a that contacts the first surface 16a of the current collector 16 and a contact surface 28b that contacts the second surface 16b of the current collector 16. The resin member 28 may also be provided on the end face 16c of the current collector 16, in which case the resin member 28 also has a contact surface 28c that contacts the end face 16c of the current collector 16. The end surface 16c is a surface connecting the first surface 16a and the second surface 16b. The contact surface 28c is a surface that connects the contact surface 28a and the contact surface 28b. The resin member 28 has a U-shaped cross section when viewed from a direction orthogonal to the outer peripheral direction of the current collector 16 (the Y-axis direction in the portion shown in FIG. 3) so as to cover the outer peripheral portion 161 of the current collector 16. Have.

絶縁ケース３０は、樹脂部材２８上に設けられている。絶縁ケース３０は、樹脂部材２８を介して集電体１６の外周部１６１を支持する。図３に示される例では、樹脂部材２８は、集電体１６の外周部１６１とともに絶縁ケース３０内に埋設されている。絶縁ケース３０は、Ｚ軸方向において隣り合う樹脂部材２８の間に位置する第１の部分３０１と、樹脂部材２８の外側を覆う第２の部分３０２とを有する。第１の部分３０１と第２の部分３０２とは、Ｚ軸方向において、交互に配置される。 The insulating case 30 is provided on the resin member 28. The insulating case 30 supports the outer peripheral portion 161 of the current collector 16 via the resin member 28. In the example shown in FIG. 3, the resin member 28 is embedded in the insulating case 30 together with the outer peripheral portion 161 of the current collector 16. The insulating case 30 has a first portion 301 located between adjacent resin members 28 in the Z-axis direction and a second portion 302 that covers the outside of the resin member 28. The first portion 301 and the second portion 302 are arranged alternately in the Z-axis direction.

本実施形態では、樹脂部材２８の熱膨張係数は、集電体１６の熱膨張係数と、絶縁ケース３０の熱膨張係数との間と値とされる。例えば、集電体１６がニッケル箔の場合、集電体１６の熱膨張係数は１．２８（１０−５／Ｋ）である。絶縁ケース３０がザイロン製のケースの場合、絶縁ケースの熱膨張係数は９（材質によって８〜１０）である。よって、樹脂部材２８の熱膨張係数は、集電体１６の熱膨張係数１．２８より大きく、絶縁ケース３０の熱膨張係数９（材質によって８〜１０）より小さい値とされる。そのような樹脂部材２８の材質の例は、熱膨張係数が６〜８のＰＳ（ポリスチレン）、熱膨張係数が８〜１０であるＰＡ（ポリアミド）６６、熱膨張係数が５〜７であるポリカーボネート（ＰＣ）、熱膨張係数が２〜７であるポリフェニレンサルファイド（ＰＰＳ）、熱膨張係数が６〜９であるポリブチレンテレフタレート（ＰＢＴ樹脂）等である。これらの材質を用いることで、樹脂部材２８に絶縁性を持たせることもできる。 In the present embodiment, the coefficient of thermal expansion of the resin member 28 is set to a value between the coefficient of thermal expansion of the current collector 16 and the coefficient of thermal expansion of the insulating case 30. For example, when the current collector 16 is a nickel foil, the coefficient of thermal expansion of the current collector 16 is 1.28 ( 10-5 / K). When the insulating case 30 is made of Zylon, the coefficient of thermal expansion of the insulating case is 9 (8 to 10 depending on the material). Therefore, the coefficient of thermal expansion of the resin member 28 is larger than the coefficient of thermal expansion of 1.28 of the current collector 16 and smaller than the coefficient of thermal expansion of 9 (8 to 10 depending on the material) of the insulating case 30. Examples of the material of such a resin member 28 are PS (polystyrene) having a coefficient of thermal expansion of 6 to 8, PA (polyethylene) 66 having a coefficient of thermal expansion of 8 to 10, and polycarbonate having a coefficient of thermal expansion of 5 to 7. (PC), polyphenylene sulfide (PPS) having a coefficient of thermal expansion of 2 to 7, polybutylene terephthalate (PBT resin) having a coefficient of thermal expansion of 6 to 9, and the like. By using these materials, the resin member 28 can be made to have an insulating property.

以上説明した蓄電装置１０では、樹脂部材２８上に設けられた絶縁ケース３０が、樹脂部材２８を介して集電体１６の外周部１６１を支持している。ここで、蓄電装置１０の製造時に集電体１６、樹脂部材２８及び絶縁ケース３０を溶着したり、蓄電装置１０をフォークリフト等に搭載して充放電させたりすると、発熱によって集電体１６、樹脂部材２８及び絶縁ケース３０が膨張する。この膨張により、集電体１６と絶縁ケース３０と間で剥離が生じるおそれがある。そこで、蓄電装置１０では、樹脂部材２８の熱膨張係数が、集電体１６の熱膨張係数と絶縁ケース３０の熱膨張係数との間の値とされている。この場合、集電体１６及び樹脂部材２８の熱膨張係数の差と、樹脂部材２８及び絶縁ケース３０の熱膨張係数の差は、いずれも、集電体１６及び絶縁ケース３０の熱膨張係数の差よりも小さくなる。その結果、例えば、樹脂部材２８及び絶縁ケース３０の熱膨張係数が同じ場合、又は、樹脂部材２８を介さずに絶縁ケース３０によって直接集電体１６の外周部１６１を支持する場合よりも、集電体１６と絶縁ケース３０との間の剥離が抑制される。このように、樹脂部材２８及び絶縁ケース３０の２種類の樹脂を用いた構成とすることで、集電体及び２種類の樹脂部材の間のそれぞれの熱膨張係数の差を小さくし、集電体１６と絶縁ケース３０との間の剥離を抑制することができる。 In the power storage device 10 described above, the insulating case 30 provided on the resin member 28 supports the outer peripheral portion 161 of the current collector 16 via the resin member 28. Here, when the current collector 16, the resin member 28, and the insulating case 30 are welded at the time of manufacturing the current collector 10, or when the current collector 10 is mounted on a forklift or the like to charge and discharge, the current collector 16, the resin The member 28 and the insulating case 30 expand. Due to this expansion, peeling may occur between the current collector 16 and the insulating case 30. Therefore, in the power storage device 10, the coefficient of thermal expansion of the resin member 28 is set to a value between the coefficient of thermal expansion of the current collector 16 and the coefficient of thermal expansion of the insulating case 30. In this case, the difference between the coefficient of thermal expansion of the current collector 16 and the resin member 28 and the difference between the coefficient of thermal expansion of the resin member 28 and the insulating case 30 are the same as the coefficient of thermal expansion of the current collector 16 and the insulating case 30. Less than the difference. As a result, for example, the coefficient of thermal expansion of the resin member 28 and the insulating case 30 is the same, or the outer peripheral portion 161 of the current collector 16 is directly supported by the insulating case 30 without the resin member 28. The peeling between the electric body 16 and the insulating case 30 is suppressed. In this way, by using the two types of resins of the resin member 28 and the insulating case 30, the difference in the coefficient of thermal expansion between the current collector and the two types of resin members is reduced, and the current is collected. The peeling between the body 16 and the insulating case 30 can be suppressed.

樹脂部材２８が絶縁性を有している場合には、例えば、集電体１６の第１の面１６ａに設けられた正極層１８と、第２の面１６ｂに設けられた負極層２０とが、集電体１６の外周部１６１のうちの樹脂部材２８が設けられた部分を経由して電気的に接続される（短絡が生じる）可能性を低減することができる。 When the resin member 28 has an insulating property, for example, the positive electrode layer 18 provided on the first surface 16a of the current collector 16 and the negative electrode layer 20 provided on the second surface 16b are formed. It is possible to reduce the possibility of being electrically connected (short circuit occurs) via the portion of the outer peripheral portion 161 of the current collector 16 provided with the resin member 28.

樹脂部材２８は、集電体１６の第１の面１６ａ及び第２の面１６ｂの両方の面上に設けられていてもよい。これにより、集電体１６の両方の面において、集電体１６と絶縁ケース３０との間の剥離を抑制することができる。 The resin member 28 may be provided on both the first surface 16a and the second surface 16b of the current collector 16. As a result, peeling between the current collector 16 and the insulating case 30 can be suppressed on both surfaces of the current collector 16.

以上説明した例では、隣り合う第１の樹脂部材（樹脂部材２８）同士は絶縁ケース３０を介して離間して設けられているが、第１の樹脂部材同士が接触するように設けられていてもよい。図４は、そのような変形例に係る第１の樹脂部材（樹脂部材２９）及び第２の樹脂部材（絶縁ケース３１）の拡大断面図である。図４に示される例では、Ｚ軸方向において隣り合うバイポーラ電極１２のそれぞれの樹脂部材２９同士は、接触している。具体的に、樹脂部材２９は、集電体１６の第１の面１６ａに接触する接触面２９ａとは反対側に接触面２９ｃを有し、集電体１６の第２の面１６ｂに接触する接触面２９ｂとは反対側に接触面２９ｄを有している。樹脂部材２９の接触面２９ｃは、下方（Ｚ軸負方向の）の樹脂部材２９の接触面２９ｄと接触している。樹脂部材２９の接触面２９ｄは、上方（Ｚ軸正方向）の樹脂部材２９の接触面２９ｃと接触している。セパレータ１４は、Ｚ軸方向から見たときに、樹脂部材２９の内側に位置している。図４に示される例では、Ｚ軸方向において、樹脂部材２９の接触面２９ｃは、当該樹脂部材２９が設けられた集電体１６の下方のセパレータ１４の中央に位置している。樹脂部材２９の接触面２９ｄは、当該樹脂部材２９が設けられた集電体１６の上方のセパレータ１４の中央に位置している。絶縁ケース３１は、樹脂部材２９の形状に合わせた形状とされ、絶縁ケース３０（図３）と比較して、Ｚ軸方向において隣り合う樹脂部材２９の間に位置する部分を有さない点で相違する。 In the example described above, the adjacent first resin members (resin members 28) are provided apart from each other via the insulating case 30, but the first resin members are provided so as to come into contact with each other. May be good. FIG. 4 is an enlarged cross-sectional view of the first resin member (resin member 29) and the second resin member (insulation case 31) according to such a modification. In the example shown in FIG. 4, the resin members 29 of the bipolar electrodes 12 adjacent to each other in the Z-axis direction are in contact with each other. Specifically, the resin member 29 has a contact surface 29c on the side opposite to the contact surface 29a that contacts the first surface 16a of the current collector 16, and contacts the second surface 16b of the current collector 16. The contact surface 29d is provided on the side opposite to the contact surface 29b. The contact surface 29c of the resin member 29 is in contact with the contact surface 29d of the resin member 29 below (in the negative direction of the Z axis). The contact surface 29d of the resin member 29 is in contact with the contact surface 29c of the resin member 29 above (in the positive direction of the Z axis). The separator 14 is located inside the resin member 29 when viewed from the Z-axis direction. In the example shown in FIG. 4, in the Z-axis direction, the contact surface 29c of the resin member 29 is located at the center of the separator 14 below the current collector 16 provided with the resin member 29. The contact surface 29d of the resin member 29 is located at the center of the separator 14 above the current collector 16 provided with the resin member 29. The insulating case 31 has a shape that matches the shape of the resin member 29, and has no portion located between adjacent resin members 29 in the Z-axis direction as compared with the insulating case 30 (FIG. 3). It's different.

樹脂部材２９の厚みは、正極層１８の厚み及び負極層２０の厚みのいずれの厚みよりも大きい。集電体１６の第１の面１６ａ及び第２の面１６ｂの両方の面上に樹脂部材２９が設けられる場合には、樹脂部材２９のうち、集電体１６の第１の面１６ａ上に設けられた部分の厚み（Ｚ軸方向の長さ）が、負極層２０の厚みよりも大きい。また、樹脂部材２９のうち、集電体１６の第２の面１６ｂ上に設けられた部分の厚みが、正極層１８の厚みよりも大きい。 The thickness of the resin member 29 is larger than either the thickness of the positive electrode layer 18 or the thickness of the negative electrode layer 20. When the resin member 29 is provided on both the first surface 16a and the second surface 16b of the current collector 16, the resin member 29 is placed on the first surface 16a of the current collector 16. The thickness of the provided portion (length in the Z-axis direction) is larger than the thickness of the negative electrode layer 20. Further, the thickness of the portion of the resin member 29 provided on the second surface 16b of the current collector 16 is larger than the thickness of the positive electrode layer 18.

以上説明したように、樹脂部材２９の厚みは、正極層１８の厚み及び負極層２０の厚みのいずれの厚みよりも大きくてもよい。これにより、複数のバイポーラ電極１２の積層方向（Ｚ軸方向）において隣り合うバイポーラ電極１２の集電体１６に設けられた正極層１８と負極層２０との間隔を確保することができる。 As described above, the thickness of the resin member 29 may be larger than either the thickness of the positive electrode layer 18 or the thickness of the negative electrode layer 20. As a result, it is possible to secure a distance between the positive electrode layer 18 and the negative electrode layer 20 provided in the current collectors 16 of the bipolar electrodes 12 adjacent to each other in the stacking direction (Z-axis direction) of the plurality of bipolar electrodes 12.

Ｚ軸方向において隣り合うバイポーラ電極１２のそれぞれの樹脂部材２９同士は、接触していてもよい。これにより、樹脂部材２９の厚みを利用して集電体１６同士の間隔を定めることができる。 The resin members 29 of the bipolar electrodes 12 adjacent to each other in the Z-axis direction may be in contact with each other. As a result, the distance between the current collectors 16 can be determined by utilizing the thickness of the resin member 29.

次に、図５〜７を用いて、蓄電装置１０の製造方法の一例について説明する。図５〜７は、実施形態に係る蓄電装置の製造方法の一工程を示す断面図である。ここでは、第１の樹脂部材及び第２の樹脂部材が、先に説明した図４に示される樹脂部材２９及び絶縁ケース３１である場合について説明する。 Next, an example of a method for manufacturing the power storage device 10 will be described with reference to FIGS. 5 to 7. 5 to 7 are cross-sectional views showing one step of the manufacturing method of the power storage device according to the embodiment. Here, a case where the first resin member and the second resin member are the resin member 29 and the insulating case 31 shown in FIG. 4 described above will be described.

（準備工程）
まず、図５に示されるように、複数のバイポーラ電極１２と複数のセパレータ１４とを準備する。複数のバイポーラ電極１２のそれぞれは、集電体１６と、正極層１８と、負極層２０とを有している。 (Preparation process)
First, as shown in FIG. 5, a plurality of bipolar electrodes 12 and a plurality of separators 14 are prepared. Each of the plurality of bipolar electrodes 12 has a current collector 16, a positive electrode layer 18, and a negative electrode layer 20.

（第１の樹脂部材を設ける工程）
次に、図５に示されるように、樹脂部材２９を、集電体１６の外周部１６１（図４参照）に設ける。樹脂部材２９は、外周部１６１全体にわたって、集電体１６の第１の面１６ａ及び第２の面１６ｂの両方の面上に設けられてよい。例えば、樹脂部材２９が集電体１６の外周部１６１を覆うように、射出形成により、樹脂部材２９が形成される。これにより、集電体１６と樹脂部材２９とが溶着される。 (Step of providing the first resin member)
Next, as shown in FIG. 5, the resin member 29 is provided on the outer peripheral portion 161 (see FIG. 4) of the current collector 16. The resin member 29 may be provided on both the first surface 16a and the second surface 16b of the current collector 16 over the entire outer peripheral portion 161. For example, the resin member 29 is formed by injection molding so that the resin member 29 covers the outer peripheral portion 161 of the current collector 16. As a result, the current collector 16 and the resin member 29 are welded together.

（積層工程）
次に、図６に示されるように、セパレータ１４を介して複数のバイポーラ電極１２を直列に積層する。この積層工程では、複数のバイポーラ電極１２の積層方向において隣り合うバイポーラ電極１２のそれぞれの樹脂部材２９同士は、接触している。セパレータ１４は、複数のバイポーラ電極１２の積層方向（Ｚ軸方向）から見て、樹脂部材２９の内側に位置するように設けられる。 (Laminating process)
Next, as shown in FIG. 6, a plurality of bipolar electrodes 12 are laminated in series via the separator 14. In this laminating step, the resin members 29 of the bipolar electrodes 12 adjacent to each other in the laminating direction of the plurality of bipolar electrodes 12 are in contact with each other. The separator 14 is provided so as to be located inside the resin member 29 when viewed from the stacking direction (Z-axis direction) of the plurality of bipolar electrodes 12.

（第２の樹脂部材を設ける工程）
次に、図７に示されるように、樹脂部材２９上に、絶縁ケース３１を設ける。例えば金型Ｍを用いた射出成形により絶縁ケース３１を形成する。これにより、樹脂部材２９と絶縁ケース３１とが溶着される。絶縁ケース３１は、樹脂部材２９を介して集電体１６の外周部を支持する。 (Step of providing the second resin member)
Next, as shown in FIG. 7, an insulating case 31 is provided on the resin member 29. For example, the insulating case 31 is formed by injection molding using the mold M. As a result, the resin member 29 and the insulating case 31 are welded together. The insulating case 31 supports the outer peripheral portion of the current collector 16 via the resin member 29.

その後、先に図１を参照して説明したように、正極プレート４０及び負極プレート５０により、複数のバイポーラ電極１２、複数のセパレータ１４、電極１１２、電極２１２及び絶縁ケース３１を挟持する。さらに、ボルトＢ及びナットＮを用いて正極プレート４０及び負極プレート５０に拘束力を付与する。これにより、蓄電装置１０が製造される。 After that, as described above with reference to FIG. 1, the positive electrode plate 40 and the negative electrode plate 50 sandwich the plurality of bipolar electrodes 12, the plurality of separators 14, the electrodes 112, the electrodes 212, and the insulating case 31. Further, the bolt B and the nut N are used to apply a binding force to the positive electrode plate 40 and the negative electrode plate 50. As a result, the power storage device 10 is manufactured.

なお、第１の樹脂部材及び第２の樹脂部材が図３に示される樹脂部材２８及び絶縁ケース３０の場合も、上述した製造方法と同様の方法により蓄電装置１０を製造できる。 When the first resin member and the second resin member are the resin member 28 and the insulating case 30 shown in FIG. 3, the power storage device 10 can be manufactured by the same method as the above-described manufacturing method.

上記の蓄電装置の製造方法によれば、集電体１６の外周部１６１の少なくとも一部において、第１の面１６ａ及び第２の面１６ｂの少なくとも一方の面上に樹脂部材２９を設けた後に、複数のバイポーラ電極１２を積層する。これにより、複数のバイポーラ電極１２を積層する際に、それぞれのバイポーラ電極１２の集電体１６に設けられた樹脂部材２９を、集電体同士の相対的な位置決めに利用することもできる。 According to the above-mentioned manufacturing method of the power storage device, after the resin member 29 is provided on at least one surface of the first surface 16a and the second surface 16b in at least a part of the outer peripheral portion 161 of the current collector 16. , A plurality of bipolar electrodes 12 are laminated. As a result, when stacking the plurality of bipolar electrodes 12, the resin member 29 provided on the current collector 16 of each bipolar electrode 12 can be used for relative positioning between the current collectors.

樹脂部材２９（第１の樹脂部材）を設ける工程では、第１の面１６ａ及び第２の面１６ｂの両方の面上に樹脂部材２９が設けられてよい。積層工程では、セパレータ１４を介して複数のバイポーラ電極１２が積層され、複数のバイポーラ電極１２の積層方向において隣り合うバイポーラ電極１２のそれぞれの樹脂部材２９同士が接触しており、複数のバイポーラ電極１２の積層方向から見たときに、セパレータ１４が樹脂部材２９の内側に位置していてよい。この場合、積層方向において隣り合うバイポーラ電極１２のそれぞれの樹脂部材２９同士が接触しているので、樹脂部材２９の厚みを利用して集電体１６同士の間隔を定めることができる。また、積層方向から見たときに、セパレータ１４が樹脂部材２９の内側に位置しているので、樹脂部材２９を利用してセパレータ１４の位置決めを行うこともできる。 In the step of providing the resin member 29 (first resin member), the resin member 29 may be provided on both the first surface 16a and the second surface 16b. In the laminating step, a plurality of bipolar electrodes 12 are laminated via the separator 14, and the resin members 29 of the adjacent bipolar electrodes 12 are in contact with each other in the stacking direction of the plurality of bipolar electrodes 12, and the plurality of bipolar electrodes 12 are in contact with each other. The separator 14 may be located inside the resin member 29 when viewed from the stacking direction of the above. In this case, since the resin members 29 of the adjacent bipolar electrodes 12 are in contact with each other in the stacking direction, the distance between the current collectors 16 can be determined by utilizing the thickness of the resin members 29. Further, since the separator 14 is located inside the resin member 29 when viewed from the stacking direction, the separator 14 can be positioned by using the resin member 29.

以上、本発明の一実施形態について説明したが、本発明は上記実施形態に限定されるものではない。上記実施形態では、一例として、集電体がニッケル箔であり、絶縁ケースがザイロン製のケースである場合、つまり、集電体の熱膨張係数が絶縁ケースの熱膨張係数よりも小さい場合について説明したが、集電体の熱膨張係数は、絶縁ケースの熱膨張係数より大きくてもよい。この場合でも、第１の樹脂部材（樹脂部材２８，２９）の熱膨張係数を集電体の熱膨張係数と絶縁ケースの熱膨張係数の間の値とすることで、上述と同様の原理により、集電体と絶縁ケースとの間の剥離を抑制することができる。 Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. In the above embodiment, as an example, a case where the current collector is a nickel foil and the insulating case is a case made of Zylon, that is, a case where the coefficient of thermal expansion of the current collector is smaller than the coefficient of thermal expansion of the insulating case will be described. However, the coefficient of thermal expansion of the current collector may be larger than the coefficient of thermal expansion of the insulating case. Even in this case, by setting the coefficient of thermal expansion of the first resin member (resin members 28, 29) to be a value between the coefficient of thermal expansion of the current collector and the coefficient of thermal expansion of the insulating case, the same principle as described above can be applied. , It is possible to suppress the peeling between the current collector and the insulating case.

１０…蓄電装置、１２…バイポーラ電極、１４…セパレータ、１６…集電体、１６ａ…第１の面、１６ｂ…第２の面、１８…正極層、２０…負極層、２８，２９…樹脂部材（第１の樹脂部材）、３０，３１…絶縁ケース（第２の樹脂部材）、１６１…外周部。 10 ... power storage device, 12 ... bipolar electrode, 14 ... separator, 16 ... current collector, 16a ... first surface, 16b ... second surface, 18 ... positive electrode layer, 20 ... negative electrode layer, 28, 29 ... resin member (First resin member), 30, 31 ... Insulation case (second resin member), 161 ... Outer peripheral portion.

Claims (6)

積層された複数のバイポーラ電極であり、前記複数のバイポーラ電極のそれぞれが、第１の面及び前記第１の面とは反対側の第２の面を有する集電体と、前記第１の面に設けられた正極層と、前記第２の面に設けられた負極層とを有している、前記複数のバイポーラ電極と、
前記集電体の外周部の少なくとも一部において、前記第１の面及び前記第２の面の少なくとも一方の面上に設けられた第１の樹脂部材と、
前記第１の樹脂部材を介して前記集電体の前記外周部を支持する第２の樹脂部材と、
を備え、
前記第１の樹脂部材の熱膨張係数は、前記集電体の熱膨張係数と前記第２の樹脂部材の熱膨張係数との間の値であり、
前記複数のバイポーラ電極の積層方向において隣り合うバイポーラ電極のそれぞれの前記第１の樹脂部材同士は、接触している、
蓄電装置。 A plurality of laminated bipolar electrodes, each of which has a first surface and a second surface opposite to the first surface, and the first surface. The plurality of bipolar electrodes having a positive electrode layer provided on the second surface and a negative electrode layer provided on the second surface.
A first resin member provided on at least one of the first surface and the second surface in at least a part of the outer peripheral portion of the current collector.
A second resin member for supporting the outer peripheral portion of the current collector through the front Symbol first resin member,
With
Thermal expansion coefficient of the first resin member, Ri value der between the thermal expansion coefficient of the second resin member and the thermal expansion coefficient of the current collector,
The first resin members of the bipolar electrodes adjacent to each other in the stacking direction of the plurality of bipolar electrodes are in contact with each other.
Power storage device. 前記第１の樹脂部材は、絶縁性を有している、
請求項１に記載の蓄電装置。 The first resin member has an insulating property.
The power storage device according to claim 1. 前記第１の樹脂部材は、前記集電体の前記第１の面及び前記第２の面の両方の面上に設けられている、
請求項１又は２に記載の蓄電装置。 The first resin member is provided on both the first surface and the second surface of the current collector.
The power storage device according to claim 1 or 2. 前記第１の樹脂部材の厚みは、前記正極層の厚み及び前記負極層の厚みのいずれの厚みよりも大きい、
請求項１〜３のいずれか１項に記載の蓄電装置。 The thickness of the first resin member is larger than either the thickness of the positive electrode layer or the thickness of the negative electrode layer.
The power storage device according to any one of claims 1 to 3. 複数のバイポーラ電極を準備する工程であり、前記複数のバイポーラ電極のそれぞれが、第１の面及び前記第１の面とは反対側の第２の面を有する集電体と、前記第１の面に設けられた正極層と、前記第２の面に設けられた負極層とを有している、工程と、
前記集電体の外周部の少なくとも一部において、前記第１の面及び前記第２の面の少なくとも一方の面上に第１の樹脂部材を設ける工程と、
前記第１の樹脂部材を設ける工程の後に、前記複数のバイポーラ電極を積層する工程と、
前記第１の樹脂部材を介して前記集電体の前記外周部を支持する第２の樹脂部材を設ける工程と、
を含み、
前記第１の樹脂部材の熱膨張係数は、前記集電体の熱膨張係数と前記第２の樹脂部材の熱膨張係数との間の値であり、
前記積層する工程では、
前記複数のバイポーラ電極の積層方向において隣り合うバイポーラ電極のそれぞれの前記第１の樹脂部材同士が接触している、
蓄電装置の製造方法。 A step of preparing a plurality of bipolar electrodes, wherein each of the plurality of bipolar electrodes has a first surface and a second surface opposite to the first surface, and the first surface. A step of having a positive electrode layer provided on a surface and a negative electrode layer provided on the second surface.
A step of providing a first resin member on at least one of the first surface and the second surface in at least a part of the outer peripheral portion of the current collector.
After the step of providing the first resin member, the step of laminating the plurality of bipolar electrodes and
Providing a second resin member for supporting the outer peripheral portion of the current collector through the front Symbol first resin member,
Including
Thermal expansion coefficient of the first resin member, Ri value der between the thermal expansion coefficient of the second resin member and the thermal expansion coefficient of the current collector,
In the laminating step,
The first resin members of the adjacent bipolar electrodes are in contact with each other in the stacking direction of the plurality of bipolar electrodes.
Manufacturing method of power storage device. 前記第１の樹脂部材を設ける工程では、前記第１の面及び前記第２の面の両方の面上に前記第１の樹脂部材が設けられ、
前記積層する工程では、
セパレータを介して前記複数のバイポーラ電極が積層され、
前記複数のバイポーラ電極の前記積層方向から見たときに、前記セパレータが前記第１の樹脂部材の内側に位置している、
請求項５に記載の蓄電装置の製造方法。 In the step of providing the first resin member, the first resin member is provided on both the first surface and the second surface.
In the laminating step,
The plurality of bipolar electrodes are laminated via a separator, and the plurality of bipolar electrodes are laminated .
When viewed from the stacking direction before Symbol plurality of bipolar electrodes, the separator is located inside of the first resin member,
The method for manufacturing a power storage device according to claim 5 .
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