JP7177807B2 - storage module - Google Patents

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JP7177807B2
JP7177807B2 JP2020163430A JP2020163430A JP7177807B2 JP 7177807 B2 JP7177807 B2 JP 7177807B2 JP 2020163430 A JP2020163430 A JP 2020163430A JP 2020163430 A JP2020163430 A JP 2020163430A JP 7177807 B2 JP7177807 B2 JP 7177807B2
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stacking direction
stepped portion
power storage
end plates
restraining
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JP2022055799A (en
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航 佐藤
忍 寺内
裕也 茂木
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プライムプラネットエナジー＆ソリューションズ株式会社
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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

Description

本開示は、蓄電モジュールに関する。 The present disclosure relates to power storage modules.

複数の蓄電セルを積層して蓄電モジュールを構成するとき、複数の蓄電セルを積層方向に拘束する必要がある。従来の拘束部材は、特開２００９－１１０８３３号公報（特許文献１）、国際公開第２０１９／１３０９３６号（特許文献２）などに開示されている。 When stacking a plurality of storage cells to form a storage module, it is necessary to constrain the plurality of storage cells in the stacking direction. Conventional restraint members are disclosed in Japanese Unexamined Patent Application Publication No. 2009-110833 (Patent Document 1), International Publication No. 2019/130936 (Patent Document 2), and the like.

特開２００９－１１０８３３号公報JP 2009-110833 A 国際公開第２０１９／１３０９３６号WO2019/130936

複数の蓄電セルを積層方向に拘束したとき、各々の蓄電セルは積層方向に加圧される。この拘束荷重に対する拘束部材の耐力を向上させつつ、拘束部材の過剰設計は防止したいという要請がある。従来の構造は、これらの要請を両立させる観点からは、必ずしも十分なものであるということはできない。 When a plurality of storage cells are restrained in the stacking direction, each storage cell is pressurized in the stacking direction. There is a demand to prevent excessive design of the restraint member while improving the strength of the restraint member against this restraint load. A conventional structure cannot necessarily be said to be sufficient from the viewpoint of satisfying both of these demands.

本開示の目的は、蓄電セルの拘束部材の耐力を向上させ、かつ拘束部材の過剰設計を抑制可能な蓄電モジュールを提供することにある。 An object of the present disclosure is to provide a power storage module capable of improving the yield strength of a restraining member of a power storage cell and suppressing excessive design of the restraining member.

本開示に係る蓄電モジュールは、積層された複数の蓄電セルと、複数の蓄電セルの積層方向の両端に配置された２つのエンドプレートと、２つのエンドプレートに接続され、複数の蓄電セルを積層方向に拘束する拘束部材とを備え、拘束部材は、積層方向の中央側に位置する第１部材と、積層方向の端部側に位置し、第１部材の端面に結合される第２部材とを含み、第１部材は、第２部材よりも薄く形成され、拘束部材は段差部を有し、段差部が積層方向から２つのエンドプレートに各々当接する。 A power storage module according to the present disclosure includes a plurality of stacked power storage cells, two end plates arranged at both ends of the plurality of power storage cells in the stacking direction, and the two end plates connected to the stacked power storage cells. and a restraining member for restraining the direction, wherein the restraining member comprises a first member located on the center side in the stacking direction and a second member located on the end side in the stacking direction and coupled to the end face of the first member. and the first member is formed thinner than the second member, and the restraining member has a stepped portion, and the stepped portion abuts on the two end plates from the stacking direction.

本開示によれば、蓄電セルの拘束部材の耐力を向上させ、かつ拘束部材の過剰設計を抑制可能な蓄電モジュールを提供することができる。 Advantageous Effects of Invention According to the present disclosure, it is possible to provide a power storage module that can improve the yield strength of a restraint member of a power storage cell and suppress excessive design of the restraint member.

組電池の基本的構成を示す図である。It is a figure which shows the basic composition of an assembled battery. 図１に示す組電池における電池セルおよびエンドプレートを示す図である。2 is a diagram showing battery cells and end plates in the assembled battery shown in FIG. 1. FIG. 図１に示す組電池における電池セルを示す図である。FIG. 2 is a diagram showing a battery cell in the assembled battery shown in FIG. 1; 図１に示す組電池におけるエンドプレートへの拘束部材の取付部の構造の一例を示す図である。1. It is a figure which shows an example of the structure of the attachment part of the restraint member to the end plate in the assembled battery shown in FIG. 拘束部材の段差部周辺の構造を外面側から見た状態を示す図である。It is a figure which shows the state which looked at the structure around the level|step-difference part of the restraint member from the outer surface side. 拘束部材の段差部周辺の構造を内面側から見た状態を示す図である。It is a figure which shows the state which looked at the structure around the level|step-difference part of the restraint member from the inner surface side. エンドプレートへの拘束部材の取付部の構造の変形例を示す図である。It is a figure which shows the modification of the structure of the attachment part of the restraint member to an end plate. エンドプレートへの拘束部材の取付部の構造の他の変形例を示す図である。It is a figure which shows the other modification of the structure of the attachment part of the restraint member to an end plate.

以下に、本開示の実施の形態について説明する。以下に説明する実施の形態において、個数、量等に言及する場合、特に記載がある場合を除き、本開示の範囲は必ずしもその個数、量等に限定されない。また、以下の実施の形態において、各々の構成要素は、特に記載がある場合を除き、本開示にとって必ずしも必須のものではない。 Embodiments of the present disclosure will be described below. In the embodiments described below, when referring to the number, amount, etc., the scope of the present disclosure is not necessarily limited to the number, amount, etc., unless otherwise specified. Also, in the following embodiments, each component is not necessarily essential for the present disclosure unless otherwise specified.

図１は、組電池１の基本的構成を示す図である。図２は、組電池１に含まれる電池セル１００とエンドプレート２００とを示す図である。図３は、組電池１における電池セル１００を示す図である。 FIG. 1 is a diagram showing the basic configuration of an assembled battery 1. As shown in FIG. FIG. 2 is a diagram showing battery cells 100 and end plates 200 included in the assembled battery 1. As shown in FIG. FIG. 3 is a diagram showing a battery cell 100 in the assembled battery 1. As shown in FIG.

図１，図２に示すように、「蓄電モジュール」の一例としての組電池１は、電池セル１００と、エンドプレート２００と、拘束部材３００とを備える。 As shown in FIGS. 1 and 2 , an assembled battery 1 as an example of a “storage module” includes battery cells 100 , end plates 200 and binding members 300 .

一例として、電池セル１００はリチウムイオン電池であるが、電池セル１００はニッケル水素電池など他の電池であってもよい。また、本開示において「蓄電モジュール」は組電池１に限定されず、電池セル１００に代えて、たとえばキャパシタが「蓄電セル」として用いられてもよい。 As an example, the battery cell 100 is a lithium ion battery, but the battery cell 100 may be another battery such as a nickel metal hydride battery. Further, in the present disclosure, the "storage module" is not limited to the assembled battery 1, and instead of the battery cells 100, for example, a capacitor may be used as the "storage cell".

複数の電池セル１００は、矢印ＤＲ１方向（配列方向）に並ぶように設けられる。電池セル１００は、電極端子１１０を含む。複数の電池セル１００の間には、図示しないセパレータが介装されている。２つのエンドプレート２００に挟持された複数の電池セル１００は、エンドプレート２００によって押圧され、２つのエンドプレート２００の間で拘束されている。 A plurality of battery cells 100 are provided so as to line up in the direction of arrow DR1 (arrangement direction). Battery cell 100 includes an electrode terminal 110 . A separator (not shown) is interposed between the plurality of battery cells 100 . A plurality of battery cells 100 sandwiched between the two end plates 200 are pressed by the end plates 200 and restrained between the two end plates 200 .

エンドプレート２００は、矢印ＤＲ１方向（配列方向）において組電池１の両端に配置されている。エンドプレート２００は、組電池１を収納するケースなどの基台に固定される。エンドプレート２００の矢印ＤＲ３方向の両端には、段差部２１０が形成される。 The end plates 200 are arranged at both ends of the assembled battery 1 in the arrow DR1 direction (arrangement direction). The end plate 200 is fixed to a base such as a case that houses the assembled battery 1 . Stepped portions 210 are formed at both ends of the end plate 200 in the direction of the arrow DR3.

拘束部材３００は、２つのエンドプレート２００を互いに接続する。拘束部材３００は、２つのエンドプレート２００に各々形成された段差部２１０に取り付けられる。 A binding member 300 connects the two end plates 200 to each other. The restraining member 300 is attached to the stepped portions 210 respectively formed on the two end plates 200 .

複数の電池セル１００およびエンドプレート２００の積層体に対して矢印ＤＲ１方向の圧縮力を作用させた状態で拘束部材３００を段差部２１０に係合させ、その後に圧縮力を解放することにより、２つのエンドプレート２００を接続する拘束部材３００に引張力が働く。その反作用として、拘束部材３００は、２つのエンドプレート２００を互いに近づける方向に押圧する。 By engaging the restraint member 300 with the stepped portion 210 while applying a compressive force in the direction of the arrow DR1 to the stack of the plurality of battery cells 100 and the end plates 200, and then releasing the compressive force, two A tensile force acts on the binding member 300 connecting the two end plates 200 . As a reaction thereto, the restraining member 300 presses the two end plates 200 in a direction to bring them closer together.

拘束部材３００は、第１部材３１０と、第２部材３２０とを含む。第１部材３１０と第２部材３２０とは、突き合わせ溶接により互いに結合される。 Restraint member 300 includes a first member 310 and a second member 320 . The first member 310 and the second member 320 are joined together by butt welding.

図３に示すように、電池セル１００は、平坦面状の直方体形状に形成されている。電極端子１１０は、正極端子１１１と、負極端子１１２とを含む。電極端子１１０は、角型の筐体１２０上に形成されている。筐体１２０には、図示しない電極体および電解液が収容されている。 As shown in FIG. 3, the battery cell 100 is formed in a flat rectangular parallelepiped shape. Electrode terminal 110 includes a positive terminal 111 and a negative terminal 112 . The electrode terminal 110 is formed on a rectangular housing 120 . The housing 120 accommodates an electrode assembly and an electrolytic solution (not shown).

図４は、組電池１におけるエンドプレート２００への拘束部材３００の取付部の構造の一例を示す図である。 4A and 4B are diagrams showing an example of a structure of an attachment portion of the restraining member 300 to the end plate 200 in the assembled battery 1. FIG.

図４に示すように、第１部材３１０の端面と第２部材３２０の端面とが対向する。第１部材３１０と突き合わせ溶接により接合された第２部材３２０は、第１部分３２１と、第１部分３２１に対して積層方向の端部側に位置する第２部分３２２とを含む。 As shown in FIG. 4, the end face of the first member 310 and the end face of the second member 320 face each other. The second member 320 joined to the first member 310 by butt welding includes a first portion 321 and a second portion 322 positioned on the end side in the stacking direction with respect to the first portion 321 .

板状の第２部材３２０は、電池セル１００の積層方向（矢印ＤＲ１方向）に沿って逆向きに折り曲げられる。第２部材３２０の第１部分３２１と第２部分３２２との間に段差部３２３が形成される。段差部３２３は、積層方向（矢印ＤＲ１方向）からエンドプレート２００に当接する。この結果、第２部材３２０は、エンドプレート２００の段差部２１０から積層方向（矢印ＤＲ１方向）に沿って荷重（拘束力の反力）を受ける。 Plate-shaped second member 320 is bent in the opposite direction along the stacking direction of battery cells 100 (arrow DR1 direction). A stepped portion 323 is formed between the first portion 321 and the second portion 322 of the second member 320 . The stepped portion 323 contacts the end plate 200 from the stacking direction (arrow DR1 direction). As a result, the second member 320 receives a load (reaction force of the binding force) from the stepped portion 210 of the end plate 200 along the stacking direction (arrow DR1 direction).

第２部材３２０には、孔部３２０Ａ１および孔部３２０Ａ２が形成されている。孔部３２０Ａ１は孔部３２０Ａ２よりも大径に形成されている。孔部３２０Ａ１と孔部３２０Ａ２とは、第２部材３２０を図４のように折り曲げた状態で、略同心となる位置に形成されている。 The second member 320 is formed with a hole portion 320A1 and a hole portion 320A2. The hole portion 320A1 is formed to have a larger diameter than the hole portion 320A2. The hole portions 320A1 and 320A2 are formed at substantially concentric positions when the second member 320 is folded as shown in FIG.

固定部材４００（ボルト）は、孔部３２０Ａ１，３２０Ａ２を貫通し、第２部材３２０をエンドプレート２００に固定する。ボルトの頭部は、孔部３２０Ａ１に収納される。 The fixing member 400 (bolt) passes through the holes 320A1 and 320A2 and fixes the second member 320 to the end plate 200. As shown in FIG. The head of the bolt is housed in the hole 320A1.

積層方向の中央側に位置する第１部材３１０は、積層方向の端部側に位置する第２部材３２０よりも薄く形成される。第１部材３１０と電池セル１００との間には、スペーサ５００が設けられている。 The first member 310 located on the central side in the stacking direction is formed thinner than the second member 320 located on the end side in the stacking direction. A spacer 500 is provided between the first member 310 and the battery cell 100 .

次に、図５，図６を用いて、拘束部材３００の段差部３２３周辺の構造について説明する。 Next, the structure around the stepped portion 323 of the restraint member 300 will be described with reference to FIGS. 5 and 6. FIG.

図５、図６に示すように、拘束部材３００の第１部材３１０は、電池セル１００の側面から電池セル１００の上面および底面に回り込むフランジ部３１１を有する。フランジ部３１１を設けることにより、比較的薄く形成された第１部材３１０の剛性を確保することができる。 As shown in FIGS. 5 and 6 , first member 310 of restraining member 300 has flange portion 311 extending from the side surface of battery cell 100 to the top and bottom surfaces of battery cell 100 . By providing the flange portion 311, it is possible to secure the rigidity of the first member 310 which is formed to be relatively thin.

折り曲げられ、重ねられた第２部材３２０は、縦方向に並ぶ複数（図６、図７の例では４つ）のスポット溶接部３２０Ｂにより固定されている。 The folded and stacked second member 320 is fixed by a plurality of (four in the example of FIGS. 6 and 7) spot-welded portions 320B arranged in the vertical direction.

次に、図７，図８を用いて、エンドプレート２００への拘束部材３００の取付部の構造の変形例について説明する。 Next, a modification of the structure of the mounting portion of the restraining member 300 to the end plate 200 will be described with reference to FIGS. 7 and 8. FIG.

図４～図６の例では、板状の第２部材３２０を複数の電池セル１００の積層方向に沿って逆向きに折り曲げることによって段差部３２３を形成する構造について説明したが、第２部材３２０を折り曲げることは本開示において必ずしも必須ではない。 In the examples of FIGS. 4 to 6, the structure in which the stepped portion 323 is formed by bending the plate-shaped second member 320 in the opposite direction along the stacking direction of the plurality of battery cells 100 has been described. Bending is not necessarily required in the present disclosure.

たとえば、図７の変形例のように、第１部材３１０をエンドプレート２００の段差部２１０まで延在させ、段差部２１０の高さ分だけ第１部材３１０よりも厚い板状の第２部材３２０を設けることにより、折り曲げ部を設けることなく段差部３２３を形成することができる。この場合、段差部３２３は、第１部材３１０と第２部材３２０との接合部に沿って形成される。 For example, as in the modification of FIG. 7, the first member 310 extends to the stepped portion 210 of the end plate 200, and the plate-shaped second member 320 is thicker than the first member 310 by the height of the stepped portion 210. , the stepped portion 323 can be formed without providing a bent portion. In this case, the stepped portion 323 is formed along the joint portion between the first member 310 and the second member 320 .

また、図８の変形例のように、第１部材３１０をエンドプレート２００の段差部２１０まで延在させ、第１部材３１０と第２部材３２０との接合部に沿って段差部３２３を形成する場合でも、第２部材３２０に折り曲げを形成することは可能である。 8, the first member 310 extends to the stepped portion 210 of the end plate 200, and the stepped portion 323 is formed along the joint portion between the first member 310 and the second member 320. Even so, it is possible to form a fold in the second member 320 .

上述した内容について要約すると、本実施の形態において、組電池１は、積層された複数の電池セル１００（蓄電セル）と、複数の電池セル１００の積層方向の両端に配置された２つのエンドプレート２００と、２つのエンドプレート２００に接続され、複数の電池セル１００を積層方向に拘束する拘束部材３００とを備える。拘束部材３００は、積層方向の中央側に位置する第１部材３１０と、積層方向の端部側に位置し、第１部材３１０の端面に結合される第２部材３２０とを含む。第１部材３１０は、第２部材３２０よりも薄く形成される。拘束部材３００は段差部３２３を有し、段差部３２３が積層方向から２つのエンドプレート２００に各々当接する。 To summarize the above-described contents, in the present embodiment, the assembled battery 1 includes a plurality of stacked battery cells 100 (storage cells) and two end plates arranged at both ends of the plurality of battery cells 100 in the stacking direction. and a restraining member 300 connected to the two end plates 200 and restraining the plurality of battery cells 100 in the stacking direction. The restraining member 300 includes a first member 310 located on the central side in the stacking direction and a second member 320 located on the end side in the stacking direction and coupled to the end surface of the first member 310 . The first member 310 is formed thinner than the second member 320 . The restraint member 300 has a stepped portion 323, and the stepped portion 323 abuts on the two end plates 200 from the stacking direction.

本実施の形態に係る組電池１によれば、拘束部材３００の第２部材３２０がエンドプレート２００の段差部２１０から積層方向（矢印ＤＲ１方向）に沿って荷重を受けるため、拘束部材３００に曲げモーメントが作用することを抑制できる。この結果、拘束部材３００の応力を緩和することができる。 According to assembled battery 1 of the present embodiment, second member 320 of restraining member 300 receives a load from stepped portion 210 of end plate 200 along the stacking direction (direction of arrow DR1). Moments can be suppressed. As a result, the stress of the restraint member 300 can be relaxed.

また、拘束部材３００において積層方向の中央側に位置する第１部材３１０を積層方向の端部側に位置する第２部材よりも薄く形成することにより、応力が比較的小さい第１部材３１０の過剰設計を抑制することができる。この結果、組電池１の製造コスト削減および重量低減を図ることができる。 In addition, by forming the first member 310 located on the center side in the stacking direction in the restraining member 300 thinner than the second member located on the end side in the stacking direction, the excessive stress of the first member 310 with relatively small stress can be reduced. Design can be constrained. As a result, the manufacturing cost and weight of the assembled battery 1 can be reduced.

このように、本実施の形態によれば、電池セル１００の拘束部材３００の耐力を向上させ、かつ拘束部材３００の過剰設計を抑制ことが可能となる。 As described above, according to the present embodiment, it is possible to improve the yield strength of the restraint member 300 of the battery cell 100 and to suppress excessive design of the restraint member 300 .

以上、本開示の実施の形態について説明したが、今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本開示の範囲は特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 Although the embodiments of the present disclosure have been described above, the embodiments disclosed this time should be considered as examples in all respects and not restrictive. The scope of the present disclosure is indicated by the claims, and is intended to include all changes within the meaning and range of equivalents to the claims.

１ 組電池、１００ 電池セル、１１０ 電極端子、１１１ 正極端子、１１２ 負極端子、１２０ 筐体、２００ エンドプレート、２１０ 段差部、３００ 拘束部材、３１０ 第１部材、３１１ フランジ部、３２０ 第２部材、３２０Ａ，３２０Ａ１，３２０Ａ２ 孔部、３２０Ｂ スポット溶接部、３２１ 第１部分、３２２ 第２部分、３２３ 段差部、４００ 固定部材、５００ スペーサ。 1 assembled battery, 100 battery cell, 110 electrode terminal, 111 positive electrode terminal, 112 negative electrode terminal, 120 housing, 200 end plate, 210 step portion, 300 restraint member, 310 first member, 311 flange portion, 320 second member, 320A, 320A1, 320A2 hole, 320B spot welded portion, 321 first portion, 322 second portion, 323 stepped portion, 400 fixing member, 500 spacer.

Claims (3)

積層された複数の蓄電セルと、
前記複数の蓄電セルの積層方向の両端に配置された２つのエンドプレートと、
前記２つのエンドプレートに接続され、前記複数の蓄電セルを前記積層方向に拘束する拘束部材とを備え、
前記拘束部材は、前記積層方向の中央側に位置する第１部材と、前記積層方向の端部側に位置し、前記第１部材の端面に結合される第２部材とを含み、
前記第１部材は、前記第２部材よりも薄く形成され、
前記拘束部材は段差部を有し、前記段差部が前記積層方向から前記２つのエンドプレートに各々当接し、
前記第２部材は、前記第１部材に突き合わせ溶接される第１部分と、前記第１部分に対して前記積層方向の端部側に位置する第２部分とを含み、前記第１部分と前記第２部分との間に前記段差部が形成される、蓄電モジュール。 a plurality of stacked energy storage cells;
two end plates arranged at both ends in the stacking direction of the plurality of storage cells;
a restraining member connected to the two end plates and restraining the plurality of storage cells in the stacking direction;
The restraining member includes a first member located on the center side in the stacking direction and a second member located on the end side in the stacking direction and coupled to the end surface of the first member,
The first member is formed thinner than the second member,
the restraint member has a stepped portion, and the stepped portion abuts on the two end plates from the stacking direction;
The second member includes a first portion that is butt-welded to the first member, and a second portion that is located on an end side in the stacking direction with respect to the first portion, and the first portion and the The power storage module, wherein the stepped portion is formed between the second portion and the second portion . 前記段差部は、板状の前記第２部材を前記複数の蓄電セルの前記積層方向に沿って逆向きに折り曲げることによって形成される、請求項１に記載の蓄電モジュール。 2. The power storage module according to claim 1, wherein said stepped portion is formed by bending said plate-like second member in the opposite direction along said stacking direction of said plurality of power storage cells. 前記複数の蓄電セルはリチウムイオン電池セルである、請求項１または請求項２に記載の蓄電モジュール。 The power storage module according to claim 1 or 2 , wherein the plurality of power storage cells are lithium ion battery cells.
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WO2019130936A1 (en) 2017-12-25 2019-07-04 三洋電機株式会社 Power supply device, vehicle equipped with power supply device, and power storage device
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WO2018235556A1 (en) 2017-06-22 2018-12-27 三洋電機株式会社 Power supply device, vehicle equipped with same, and electricity storage device
WO2019130937A1 (en) 2017-12-25 2019-07-04 三洋電機株式会社 Power supply device, vehicle equipped with power supply device, and power storage device
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