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WO2018155090A1 - Battery pack and busbar for battery pack - Google Patents

Battery pack and busbar for battery pack Download PDF

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Publication number
WO2018155090A1
WO2018155090A1 PCT/JP2018/002838 JP2018002838W WO2018155090A1 WO 2018155090 A1 WO2018155090 A1 WO 2018155090A1 JP 2018002838 W JP2018002838 W JP 2018002838W WO 2018155090 A1 WO2018155090 A1 WO 2018155090A1
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WO
WIPO (PCT)
Prior art keywords
flat
bus bar
pair
battery module
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/002838
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French (fr)
Japanese (ja)
Inventor
和則 小島
堀　浩文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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Filing date
Publication date
Application filed by Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Priority to JP2019501161A priority Critical patent/JP6782830B2/en
Publication of WO2018155090A1 publication Critical patent/WO2018155090A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • 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

Definitions

  • the present invention relates to an assembled battery in which a plurality of flat rectangular secondary cells are connected, and a bus bar for the assembled battery.
  • An assembled battery constructed by connecting a plurality of flat rectangular secondary cells is a fixing member (hereinafter referred to as an engineering member or the like) that holds a plurality of single cells and single cells.
  • a fixing member hereinafter referred to as an engineering member or the like
  • Single cell holder and end plate hereinafter referred to as end plate
  • side plate mainly made of a metal rigid body
  • side plate It is maintained as a structure by applying (hereinafter referred to as lashing force).
  • lashing force As shown in Patent Document 1, flat rectangular secondary unit cells use a metal flat plate called a bus bar for electrical connection of the unit cells.
  • Battery packs installed in automobiles, etc. must be repeatedly used for charging and discharging with a large current due to the required performance and necessity. As a result, expansion and contraction of the flat area of the battery cell due to changes in internal cell pressure Is prompted.
  • the bus bar is provided with a bent portion for the purpose of absorbing vibration and shock, and the relaxation is achieved.
  • a metal material mainly using dissimilar metal bonding can be mentioned.
  • the dissimilar metals often use a metal mainly made of aluminum and a metal mainly made of copper. Since the bus bar having the bent portion is stressed when the refracting portion is provided, conventionally, a joint portion of different metals has been provided so as to avoid the bent portion.
  • the means for solving the above problems are, for example, as follows.
  • a bus bar having a plurality of secondary batteries, a pair of flat portions, and a bent portion disposed between one flat portion and the other flat portion of the pair of flat portions, and connecting the plurality of secondary batteries to each other.
  • the bus bar is a clad material in which different metals are bonded to each other, and a bonding portion that is a bonding end portion of the different metals is formed between the one flat portion and the other flat portion.
  • a battery module characterized by being arranged in each.
  • the height can be suppressed (low profile), and a bus bar resistant to stress can be provided.
  • FIG. Perspective view of unit cell 2 The figure which looked at the bus bar of Example 1 from the battery cover direction The figure which looked at the bus bar of Example 1 from the arrangement direction The figure which looked at the bus bar of Example 1 from the width direction The perspective view of the bus bar 9 of the comparative example 1 The figure which looked at the bus bar of the comparative example 1 from the battery cover direction The figure which looked at the bus bar of the comparative example 1 from the arrangement direction The figure which looked at the bus bar of the comparative example 1 from the width direction The figure which looked at the bus bar of Example 2 from the battery cover direction The figure which looked at the bus bar of Example 2 from the arrangement direction The figure which looked at the bus bar of Example 2 from the width direction
  • FIG. 1 is an external perspective view of the assembled battery 1
  • FIG. 2 is a perspective view showing a state in which a part of the assembled battery 1 shown in FIG. 1 is disassembled.
  • the assembled battery 1 includes a plurality of unit cells 2 stacked, a pair of end holders 3 provided at ends of the plurality of unit cells stacked, and a plurality of individual cells interposed between the plurality of unit cells 2.
  • the cell holder 4, the end plate 5 disposed at both ends in the arrangement direction (X direction) of the plurality of unit cells 2 and sandwiched from both sides in the arrangement direction, along the width direction (Y direction) both ends of the plurality of unit cells 2 It has a pair of side plates 6 arranged and extending from one end to the other end in the arrangement direction and fixed to the pair of end plates 5.
  • the end plate 5 and the side plate 6 are fixed by a fixing member 7 such as a rivet.
  • the unit cell 2 has a pair of wide surfaces 201w, a pair of narrow surfaces 201n, a lid 202, and a can bottom 201b.
  • the unit cells 2 are arranged in the arrangement direction with the wide surfaces 201 w facing each other.
  • the lids 202 of the plurality of unit cells 202 are arranged on one side in the height direction (Z direction) of the arranged unit cells 2, and the positive terminal 203 and the negative terminal 204 provided on the lid 202 of the adjacent unit cell 2.
  • the single cells 2 are arranged in such a manner that the positive electrode terminal and the negative electrode terminal are alternately switched in the width direction.
  • the bus bar 9 is divided and provided in a bus bar case 8 provided to face the lid of the unit cell 2.
  • the bus bar case 8 has a hole through which the cell terminal and the bus bar 9 are connected.
  • FIG. 3 is a perspective view of the unit cell 2.
  • the unit cell 2 has a pair of wide surfaces 201w and a pair of narrow surfaces 201n, a lid 202, and a can bottom 201b.
  • the lid 202 is provided with a positive terminal 203 and a negative terminal 204.
  • the positive terminal 203 and the negative terminal 203 have a plane connected to the bus bar 9.
  • the lid 202 may be provided with a gas discharge valve 202b, an electrolyte injection hole 202, and the like.
  • FIG. 4 is a view of the bus bar of the first embodiment as viewed from the battery lid direction
  • FIG. 5 is a view of the bus bar of the first embodiment as viewed from the arrangement direction
  • FIG. 6 is a view of the bus bar of the first embodiment as viewed from the width direction. .
  • the bus bar 9 has a pair of flat portions 912 and 911 connected to the positive electrode terminal and the negative electrode terminal, respectively, and bent portions 910 and 914 provided between the pair of flat portions 912 and 911.
  • the pair of flat portions 912 and 911 includes a pair of rising bent portions 910 that rise from the flat portion 912, a U-shaped bent portion 914 that connects the pair of rising bent portions, and, in some cases, between the U-shaped bent portion 914 and the rising bent portion. It is connected by the middle part provided. It is possible to reduce the height of the bus bar 9 by not having the intermediate part or by making the intermediate part small. When the intermediate portion is not provided, the pair of rising bent portions 910 are directly connected by the U-shaped bent portion 914.
  • the rising bent part 910 may rise up perpendicularly to the surface of the flat part, or may rise up at an angle.
  • the U-shaped bent portion may be bent with a corner other than the U-shape.
  • a clad material obtained by joining different kinds of metals can be used.
  • a metal mainly made of aluminum and a metal mainly made of copper can be used, and each material is bonded with a bonding portion as a boundary. It is preferable that the both ends (joint part) of the joining edge part of dissimilar metals are each arrange
  • the joint portion 916 is linearly provided from the one flat portion 912 toward the other flat portion 911 via the bent portions 914 and 910.
  • the joint is a place where dissimilar metals are joined together, it is less resistant to peeling than other places. Therefore, conventionally, such a joint has been provided at a place other than the bent portion, for example, the intermediate portion 913 so that the stress applied during the manufacturing of the bent portions 914 and 910 is not applied.
  • a joint is provided in the middle.
  • the height of the bus bar 9 is increased because the length of the intermediate portion must be increased.
  • the risk of peeling is reduced as compared with the case where joint portions are provided in the bent portions.
  • the height of the bus bar 9 can be reduced as compared with the case where the joint portion is provided in the intermediate portion.
  • the bus bar 9 is often stressed in the cell arrangement direction. Therefore, it is possible to obtain a structure in which the bonding portion is less likely to be peeled off by providing an angle with respect to the stress than in the case where the bonding portion is provided perpendicular to the arrangement direction.
  • an aluminum plate and a copper plate are brought into contact with each other to be clad, punched so that the joint is oblique to the plate of the bus bar 9 as shown in the figure, and then a bent portion is formed. It is manufactured by letting.
  • the bus bar 9 is connected to the unit cell by welding the flat portion 912 and the positive terminal 203 and welding the flat portion 911 and the negative terminal 912 (welded portion 917).
  • the flat portion 912 and the positive electrode terminal are preferably welded at a position where the dissimilar metals of the bus bar are not mixed in the flat portion, and the connection between the flat portion 911 and the negative electrode terminal is the same.
  • the bus bar 9 has a welded portion welded to the terminal. The welded portion is provided at a position that is flatter than the joint portion 916 and does not overlap the joint portion 916.
  • Comparative Example 1 a comparative example is shown as a comparison with the first embodiment.
  • FIG. 7 is a perspective view of the bus bar 9 of the first comparative example.
  • FIG. 8 is a view of the bus bar of Comparative Example 1 viewed from the battery lid direction
  • FIG. 9 is a view of the bus bar of Comparative Example 1 viewed from the arrangement direction
  • FIG. 10 is a view of the bus bar of Comparative Example 1 viewed from the width direction. .
  • the bus bar 9 is made of a clad material of a metal mainly made of aluminum and a metal mainly made of copper, as in the first embodiment, and is the same as the embodiment except for the position of the joint portion 916.
  • the joint part 916 is provided in the intermediate part 913.
  • the joint portion 916 By providing the joint portion 916 at a place other than the bent portions 910 and 914, it is possible to reduce a risk that the joint portion is peeled off when the bent portions 910 and 914 are formed.
  • the height of the bus bar 9 increases due to the increase in the intermediate portion by providing the joint portion 916 in the intermediate portion 913.
  • the joint portion is provided substantially perpendicular to the stress applied when the battery is used.
  • Example 1 has a higher peel strength because there is an angle with respect to stress than perpendicular.
  • Example 2 11 is a view of the bus bar of Example 2 as viewed from the battery lid direction
  • FIG. 12 is a view of the bus bar of Example 2 as viewed from the arrangement direction
  • FIG. 13 is a view of the bus bar of Example 2 as viewed from the width direction. .
  • the bus bar 9 is made of a clad material of a metal mainly made of aluminum and a metal mainly made of copper, as in the first embodiment, and is the same as the embodiment except for the position of the joint portion 916.
  • the joint portion 916 is disposed on each of the pair of flat portions as in the first embodiment. Therefore, the risk of peeling can be reduced as compared with the case where the joint portion is provided in the bent portion, and the height of the bus bar 9 can be reduced as compared with the case where the joint portion is provided in the intermediate portion.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

In prior art, a section wherein dissimilar metals are mutually joined is provided in a manner that avoids a folding section. However, in such cases, a problem is that space to provide the joining section is required so reducing the profile of the busbar is difficult. The battery module of the invention comprises a plurality of secondary batteries, and a busbar having a pair of flat sections and a folding section disposed between one of the flat sections and the other flat section from the pair of flat sections, for connecting the plurality of secondary batteries to one another. The battery module is characterized in that: the busbar is a clad material wherein the dissimilar metals have been joined mutually; and, the joining sections, which are the end sections from the mutual junction between the dissimilar metals, are disposed respectively in the one flat section and the other flat section.

Description

組電池及び組電池用バスバBattery pack and battery pack bus bar

　本発明は、扁平な角型二次単電池を複数個連結した組電池及び組電池用バスバに関する。 The present invention relates to an assembled battery in which a plurality of flat rectangular secondary cells are connected, and a bus bar for the assembled battery.

　扁平な角型二次単電池（以下単電池）を複数個連結して構成される組電池は、複数の単電池と単電池を保持する主にエンジニアリングプラスチック等の絶縁部材からなる固定部材（以下単電池ホルダ）と主に金属の剛体からなる端板（以下エンドプレート）を広域扁平面に平行に積み重ね、それらを拘束（以下固縛）する拘束部材（以下サイドプレート）である一定の拘束力（以下固縛力）を付与することで構造体として維持している。扁平な角型二次単電池同士は、特許文献１で示すように、該単電池の電気的接続に、バスバと呼ばれる金属製の平板が用いられる。 An assembled battery constructed by connecting a plurality of flat rectangular secondary cells (hereinafter referred to as single cells) is a fixing member (hereinafter referred to as an engineering member or the like) that holds a plurality of single cells and single cells. Single cell holder) and end plate (hereinafter referred to as end plate) mainly made of a metal rigid body are stacked in parallel with a wide flat surface and fixed (hereinafter referred to as side plate). It is maintained as a structure by applying (hereinafter referred to as lashing force). As shown in Patent Document 1, flat rectangular secondary unit cells use a metal flat plate called a bus bar for electrical connection of the unit cells.

　自動車等に搭載される組電池は、その求められる性能及び必要性から大電流での充放電を繰り返す使い方は必然的とされ、ひいては単電池内部内圧の変化に伴う単電池広域扁平面の伸縮変形が促される。また、該組電池は主に自動車に搭載される故、振動衝撃に起因する特に単電池電極部への応力の発生が疲労破壊や塑性変形を引き起こす懸念がある。このため、バスバに振動衝撃吸収を目的とした折り曲げ部を設けることでその緩和を図っていた。 Battery packs installed in automobiles, etc., must be repeatedly used for charging and discharging with a large current due to the required performance and necessity. As a result, expansion and contraction of the flat area of the battery cell due to changes in internal cell pressure Is prompted. In addition, since the assembled battery is mainly mounted in an automobile, there is a concern that the generation of stress particularly in the unit cell electrode portion due to vibration impact causes fatigue failure or plastic deformation. For this reason, the bus bar is provided with a bent portion for the purpose of absorbing vibration and shock, and the relaxation is achieved.

特開２０１４－０７５１７９号公報JP 2014-075179 A

　バスバの材料として、主に異種金属接合を用いた金属材が挙げられる。異種金属はそれぞれアルミを主材とする金属と銅を主材とする金属を用いる場合が多い。折り曲げ部を有するバスバは屈折部を設ける際に応力がかかるため、従来は、折り曲げ部を避けるように異種金属同士の接合部を設けていた。 As a material of the bus bar, a metal material mainly using dissimilar metal bonding can be mentioned. The dissimilar metals often use a metal mainly made of aluminum and a metal mainly made of copper. Since the bus bar having the bent portion is stressed when the refracting portion is provided, conventionally, a joint portion of different metals has been provided so as to avoid the bent portion.

　しかし、この場合、接合部を設けるためのスペースが必要となり、バスバの低背化が難しい問題があった。 However, in this case, there is a problem that it is difficult to reduce the height of the bus bar because a space for providing the joint portion is required.

　また、このような接合部は、応力に対する剥がれ耐性に低いという課題があった。 Also, such a joint has a problem of low resistance to peeling against stress.

　上記課題を解決する手段は例えば以下である。 The means for solving the above problems are, for example, as follows.

　複数の二次電池と、一対の平坦部と、前記一対の平坦部の一方の平坦部と他方の平坦部の間に配置された折り曲げ部を有し、前記複数の二次電池同士を繋ぐバスバと、を備えた電池モジュールにおいて、前記バスバは、異種金属同士を接合したクラッド材であり、かつ異種金属同士の接合端部である接合部は、前記一方の平坦部と前記他方の平坦部のそれぞれに配置されることを特徴とする電池モジュール。 A bus bar having a plurality of secondary batteries, a pair of flat portions, and a bent portion disposed between one flat portion and the other flat portion of the pair of flat portions, and connecting the plurality of secondary batteries to each other. And the bus bar is a clad material in which different metals are bonded to each other, and a bonding portion that is a bonding end portion of the different metals is formed between the one flat portion and the other flat portion. A battery module characterized by being arranged in each.

　本発明により、クラッド材を用い、折り曲げ部を設けたとしても、高さを抑えることができ（低背化）、応力に強いバスバを提供することができる。 According to the present invention, even if a clad material is used and a bent portion is provided, the height can be suppressed (low profile), and a bus bar resistant to stress can be provided.

組電池１の外観斜視図External perspective view of the assembled battery 1 図１に示す組電池の一部を分解した状態を示す斜視図。The perspective view which shows the state which decomposed | disassembled some battery packs shown in FIG. 単電池２の斜視図Perspective view of unit cell 2 実施例１のバスバを電池蓋方向から見た図The figure which looked at the bus bar of Example 1 from the battery cover direction 実施例１のバスバを配列方向から見た図The figure which looked at the bus bar of Example 1 from the arrangement direction 実施例１のバスバを幅方向から見た図The figure which looked at the bus bar of Example 1 from the width direction 比較例１のバスバ９の斜視図The perspective view of the bus bar 9 of the comparative example 1 比較例１のバスバを電池蓋方向から見た図The figure which looked at the bus bar of the comparative example 1 from the battery cover direction 比較例１のバスバを配列方向から見た図The figure which looked at the bus bar of the comparative example 1 from the arrangement direction 比較例１のバスバを幅方向から見た図The figure which looked at the bus bar of the comparative example 1 from the width direction 実施例２のバスバを電池蓋方向から見た図The figure which looked at the bus bar of Example 2 from the battery cover direction 実施例２のバスバを配列方向から見た図The figure which looked at the bus bar of Example 2 from the arrangement direction 実施例２のバスバを幅方向から見た図The figure which looked at the bus bar of Example 2 from the width direction

　以下、本発明に係わる組電池の実施形態を図面に基づき説明する。 Hereinafter, an embodiment of an assembled battery according to the present invention will be described with reference to the drawings.

　図１は組電池１の外観斜視図、図２は図１に示す組電池１の一部を分解した状態を示す斜視図である。 FIG. 1 is an external perspective view of the assembled battery 1, and FIG. 2 is a perspective view showing a state in which a part of the assembled battery 1 shown in FIG. 1 is disassembled.

　（実施例１）　
　組電池１は積層された複数の単電池２と、積層された複数の単電池の端部に設けられたた一対の端ホルダ３、複数の単電池２の間に個々に介在される複数の単電池ホルダ４、複数の単電池２の配列方向（Ｘ方向）両端部に配置されて配列方向両側から挟みこむエンドプレート５、複数の単電池２の幅方向（Ｙ方向）両端部に沿って配置され配列方向の一方端部から他方端部に渡って延在し一対のエンドプレート５と固定される一対のサイドプレート６を有している。エンドプレート５とサイドプレート６は、リベット等の固定部材７で固定される。 Example 1
The assembled battery 1 includes a plurality of unit cells 2 stacked, a pair of end holders 3 provided at ends of the plurality of unit cells stacked, and a plurality of individual cells interposed between the plurality of unit cells 2. The cell holder 4, the end plate 5 disposed at both ends in the arrangement direction (X direction) of the plurality of unit cells 2 and sandwiched from both sides in the arrangement direction, along the width direction (Y direction) both ends of the plurality of unit cells 2 It has a pair of side plates 6 arranged and extending from one end to the other end in the arrangement direction and fixed to the pair of end plates 5. The end plate 5 and the side plate 6 are fixed by a fixing member 7 such as a rivet.

　配列された単電池２は、後述する図３のような角形の扁平形状のものを用いることができる。単電池２は、一対の幅広面２０１ｗと一対の幅狭面２０１ｎ、および、蓋２０２、缶底２０１ｂを有する。単電池２は、幅広面２０１ｗ同士を向き合わせて配列方向に配列される。配列された単電池２の高さ方向（Ｚ方向）一方側に複数の単電池２０２の蓋２０２が配置されており、隣り合う単電池２の蓋２０２に設けられた正極端子２０３および負極端子２０４がバスバ９により接続される。したがって、単電池２は、正極端子と負極端子が幅方向交互に入れ替わる形で配列されることになる。 As the arrayed unit cells 2, a rectangular flat shape as shown in FIG. 3 to be described later can be used. The unit cell 2 has a pair of wide surfaces 201w, a pair of narrow surfaces 201n, a lid 202, and a can bottom 201b. The unit cells 2 are arranged in the arrangement direction with the wide surfaces 201 w facing each other. The lids 202 of the plurality of unit cells 202 are arranged on one side in the height direction (Z direction) of the arranged unit cells 2, and the positive terminal 203 and the negative terminal 204 provided on the lid 202 of the adjacent unit cell 2. Are connected by a bus bar 9. Accordingly, the single cells 2 are arranged in such a manner that the positive electrode terminal and the negative electrode terminal are alternately switched in the width direction.

　バスバ９は単電池２の蓋に対向して設けられるバスバケース８にそれぞれ区画されて設けられる。バスバケース８には孔があり、この孔を通して単電池の端子とバスバ９が接続されている。 The bus bar 9 is divided and provided in a bus bar case 8 provided to face the lid of the unit cell 2. The bus bar case 8 has a hole through which the cell terminal and the bus bar 9 are connected.

　図３は単電池２の斜視図である。 FIG. 3 is a perspective view of the unit cell 2.

　単電池２は、一対の幅広面２０１ｗと一対の幅狭面２０１ｎ、および、蓋２０２、缶底２０１ｂを有する。蓋２０２には正極端子２０３、負極端子２０４が設けられている。正極端子２０３および負極端子２０３はバスバ９と接続される平面を有している。蓋２０２には、他にガス排出弁２０２ｂ、電解液注入孔２０２等を設けてもよい。 The unit cell 2 has a pair of wide surfaces 201w and a pair of narrow surfaces 201n, a lid 202, and a can bottom 201b. The lid 202 is provided with a positive terminal 203 and a negative terminal 204. The positive terminal 203 and the negative terminal 203 have a plane connected to the bus bar 9. In addition, the lid 202 may be provided with a gas discharge valve 202b, an electrolyte injection hole 202, and the like.

　図４は実施例１のバスバを電池蓋方向から見た図、図５は実施例１のバスバを配列方向から見た図、図６は実施例１のバスバを幅方向から見た図である。 4 is a view of the bus bar of the first embodiment as viewed from the battery lid direction, FIG. 5 is a view of the bus bar of the first embodiment as viewed from the arrangement direction, and FIG. 6 is a view of the bus bar of the first embodiment as viewed from the width direction. .

　バスバ９は、正極端子、負極端子とそれぞれ接続される一対の平坦部９１２、９１１、および、一対の平坦部９１２、９１１の間に設けられた折り曲げ部９１０、９１４を有する。
一対の平坦部９１２、９１１は、平坦部９１２から立ち上がる一対の立ち上がり折り曲げ部９１０、一対の立ち上がり折り曲げ部をつなぐＵ字折り曲げ部９１４、および場合によってはＵ字折り曲げ部９１４と立ち上がり折り曲げ部の間に設けられた中間部により繋がっている。中間部を有さないか、中間部が小さいことによってバスバ９の高さを低くすることができる。中間部を有さない場合、一対の立ち上がり折り曲げ部９１０は、Ｕ字折り曲げ部９１４により直接繋がっている。 The bus bar 9 has a pair of flat portions 912 and 911 connected to the positive electrode terminal and the negative electrode terminal, respectively, and bent portions 910 and 914 provided between the pair of flat portions 912 and 911.
The pair of flat portions 912 and 911 includes a pair of rising bent portions 910 that rise from the flat portion 912, a U-shaped bent portion 914 that connects the pair of rising bent portions, and, in some cases, between the U-shaped bent portion 914 and the rising bent portion. It is connected by the middle part provided. It is possible to reduce the height of the bus bar 9 by not having the intermediate part or by making the intermediate part small. When the intermediate portion is not provided, the pair of rising bent portions 910 are directly connected by the U-shaped bent portion 914.

　ここで、立ち上がり折り曲げ部９１０は、平坦部の面に対して垂直に立ち上がっていてもよく、角度を有して立ち上がっていてもよい。Ｕ字折り曲げ部はＵ字以外にも角を有した状態で折れ曲がっていてもよい。 Here, the rising bent part 910 may rise up perpendicularly to the surface of the flat part, or may rise up at an angle. The U-shaped bent portion may be bent with a corner other than the U-shape.

　バスバ９として、異種金属同士を接合したクラッド材を用いることができる。材料としては例えば、アルミを主材とする金属と銅を主材とする金属を用いることができ、それぞれの材料は接合部を境に接合されている。異種金属同士の接合端部の両端（接合部）は一対の平坦部のそれぞれに配置されることが好ましい。実施例１において、接合部９１６は、一方の平坦部９１２から他方の平坦部９１１に向かって折り曲げ部９１４、９１０を介して直線状に設けられている。 As the bus bar 9, a clad material obtained by joining different kinds of metals can be used. As the material, for example, a metal mainly made of aluminum and a metal mainly made of copper can be used, and each material is bonded with a bonding portion as a boundary. It is preferable that the both ends (joint part) of the joining edge part of dissimilar metals are each arrange | positioned at a pair of flat part. In the first embodiment, the joint portion 916 is linearly provided from the one flat portion 912 toward the other flat portion 911 via the bent portions 914 and 910.

　接合部は、異種金属同士を接合させた箇所であるため、他の場所よりも応力に対して剥がれ耐性が低い。したがって、従来、このような接合部は、折り曲げ部９１４、９１０製造時にかかる応力がかからないように折り曲げ部以外の箇所、例えば、中間部９１３に設けられていた。しかし、中間部に接合部を設けた場合。中間部の長さを大きくとらなければならないため、バスバ９の高さが大きくなってしまう問題があった。しかし、本願発明のように異種金属同士の接合端部の両端（接合部）を一対の平坦部のそれぞれに配置させることで、折り曲げ部に接合部を設けた場合と比べて剥がれのリスクを低減でき、中間部に接合部を設けた場合と比べてバスバ９の高さを低くすることができる。 Since the joint is a place where dissimilar metals are joined together, it is less resistant to peeling than other places. Therefore, conventionally, such a joint has been provided at a place other than the bent portion, for example, the intermediate portion 913 so that the stress applied during the manufacturing of the bent portions 914 and 910 is not applied. However, when a joint is provided in the middle. There is a problem that the height of the bus bar 9 is increased because the length of the intermediate portion must be increased. However, by disposing both ends (joint portions) of joint ends of dissimilar metals on each of a pair of flat portions as in the present invention, the risk of peeling is reduced as compared with the case where joint portions are provided in the bent portions. In addition, the height of the bus bar 9 can be reduced as compared with the case where the joint portion is provided in the intermediate portion.

　また、バスバ９には、単電池の配列方向に応力がかかる場合が多い。したがって、接合部は配列方向と垂直に設けられていた場合よりも応力に対して、垂直よりも角度を設けることで、剥がれにくい構造とすることができる。 Also, the bus bar 9 is often stressed in the cell arrangement direction. Therefore, it is possible to obtain a structure in which the bonding portion is less likely to be peeled off by providing an angle with respect to the stress than in the case where the bonding portion is provided perpendicular to the arrangement direction.

　異種金属同士の接合端部の両端（接合部）を一対の平坦部のそれぞれに配置することで、応力に対して、垂直よりも角度を設けることができ、応力に強い構造とすることができる。 By disposing both ends (joint portions) of joint ends of different metals on each of the pair of flat portions, an angle can be provided with respect to stress rather than normal, and a structure resistant to stress can be obtained. .

　異種金属同士を接合する方法としては、例えば、アルミ板と銅版とを突き合わせてクラッド化させ、図のようにバスバ９の板に対して接合部が斜めになるように打ち抜き、その後折り曲げ部を形成させることで製造される。 As a method of joining dissimilar metals, for example, an aluminum plate and a copper plate are brought into contact with each other to be clad, punched so that the joint is oblique to the plate of the bus bar 9 as shown in the figure, and then a bent portion is formed. It is manufactured by letting.

　その他、公知の技術を用いることができる。例えば、アルミと銅とを圧力によって面接合し、熱処理によって接合を強化する。接合したこの材料から接合部を有する板状の部材を切り出し、折り曲げ部を形成させることで製造することができる。 Other known techniques can be used. For example, aluminum and copper are surface bonded by pressure, and the bonding is strengthened by heat treatment. It can manufacture by cutting out the plate-shaped member which has a junction part from this joined material, and forming a bending part.

　バスバ９は、平坦部９１２と正極端子２０３との溶接、および平坦部９１１と負極端子９１２との溶接により単電池と接続される（溶接部９１７）。平坦部９１２と正極端子との溶接は、平坦部のうちバスバの異種金属が混ざらない位置でされるのが好ましく、平坦部９１１と負極端子との接続も同様である。バスバ９は端子と溶接される溶接部を有しており。溶接部は、接合部９１６よりも平坦部側で接合部９１６とか重ならない位置に設けられている。 The bus bar 9 is connected to the unit cell by welding the flat portion 912 and the positive terminal 203 and welding the flat portion 911 and the negative terminal 912 (welded portion 917). The flat portion 912 and the positive electrode terminal are preferably welded at a position where the dissimilar metals of the bus bar are not mixed in the flat portion, and the connection between the flat portion 911 and the negative electrode terminal is the same. The bus bar 9 has a welded portion welded to the terminal. The welded portion is provided at a position that is flatter than the joint portion 916 and does not overlap the joint portion 916.

　（比較例１）
　ここで、実施例１との比較として比較例を示す。 (Comparative Example 1)
Here, a comparative example is shown as a comparison with the first embodiment.

　図７は、比較例１のバスバ９の斜視図である。 FIG. 7 is a perspective view of the bus bar 9 of the first comparative example.

　図８は比較例１のバスバを電池蓋方向から見た図、図９は比較例１のバスバを配列方向から見た図、図１０は比較例１のバスバを幅方向から見た図である。 8 is a view of the bus bar of Comparative Example 1 viewed from the battery lid direction, FIG. 9 is a view of the bus bar of Comparative Example 1 viewed from the arrangement direction, and FIG. 10 is a view of the bus bar of Comparative Example 1 viewed from the width direction. .

　バスバ９は実施例１と同様、アルミを主材とする金属と銅を主材とする金属とのクラッド材からなり、接合部９１６の位置以外は実施例と同様である。 The bus bar 9 is made of a clad material of a metal mainly made of aluminum and a metal mainly made of copper, as in the first embodiment, and is the same as the embodiment except for the position of the joint portion 916.

　接合部９１６は、中間部９１３に設けられている。接合部９１６を折り曲げ部９１０、９１４以外の箇所に設けることで、折り曲げ部９１０、９１４形成時に接合部が剥がれてしまうリスクを低減することができる。しかし、接合部９１６を中間部９１３に設けることで中間部が大きくなることによるバスバ９の高さが高くなる問題がある。また、電池使用時にかかる応力に対して接合部がほぼ垂直に設けられている。これに対して実施例１は、応力に対して、垂直よりも角度があるため、剥がれ強度が高い。 The joint part 916 is provided in the intermediate part 913. By providing the joint portion 916 at a place other than the bent portions 910 and 914, it is possible to reduce a risk that the joint portion is peeled off when the bent portions 910 and 914 are formed. However, there is a problem that the height of the bus bar 9 increases due to the increase in the intermediate portion by providing the joint portion 916 in the intermediate portion 913. Further, the joint portion is provided substantially perpendicular to the stress applied when the battery is used. On the other hand, Example 1 has a higher peel strength because there is an angle with respect to stress than perpendicular.

　（実施例２）
　図１１は実施例２のバスバを電池蓋方向から見た図、図１２は実施例２のバスバを配列方向から見た図、図１３は実施例２のバスバを幅方向から見た図である。 (Example 2)
11 is a view of the bus bar of Example 2 as viewed from the battery lid direction, FIG. 12 is a view of the bus bar of Example 2 as viewed from the arrangement direction, and FIG. 13 is a view of the bus bar of Example 2 as viewed from the width direction. .

　バスバ９は実施例１と同様、アルミを主材とする金属と銅を主材とする金属とのクラッド材からなり、接合部９１６の位置以外は実施例と同様である。 The bus bar 9 is made of a clad material of a metal mainly made of aluminum and a metal mainly made of copper, as in the first embodiment, and is the same as the embodiment except for the position of the joint portion 916.

　接合部９１６は、実施例１と同様、一対の平坦部のそれぞれに配置される。したがって、折り曲げ部に接合部を設けた場合と比べて剥がれのリスクを低減でき、中間部に接合部を設けた場合と比べてバスバ９の高さを低くすることができる。 The joint portion 916 is disposed on each of the pair of flat portions as in the first embodiment. Therefore, the risk of peeling can be reduced as compared with the case where the joint portion is provided in the bent portion, and the height of the bus bar 9 can be reduced as compared with the case where the joint portion is provided in the intermediate portion.

１　　組電池
２　　単電池
３　　端ホルダ
４　　単電池ホルダ
５　　エンドプレート
６　　サイドプレート
７　　固定部材
８　　バスバケース
９　　バスバ
２０１ｗ　幅広面
２０１ｎ　幅狭面
２０２　蓋
２０１ｂ　缶底
２０３　正極端子
２０４　負極端子
９１０　折り曲げ部（立ち上がり折り曲げ部）
９１１、９１２　平坦部
９１３　中間部
９１４　折り曲げ部（Ｕ字折り曲げ部）
９１６　接合部
９１７　溶接部 1 assembled battery 2 cell 3 end holder 4 cell holder 5 end plate 6 side plate 7 fixing member 8 bus bar case 9 bus bar 201w wide surface 201n narrow surface 202 lid 201b can bottom 203 positive electrode terminal 204 negative electrode terminal 910 bent part (rising bent) Part)
911, 912 Flat part 913 Middle part 914 Bending part (U-shaped bending part)
916 Joint 917 Weld

Claims (5)

　複数の二次電池と、
　一対の平坦部と、前記一対の平坦部の一方の平坦部と他方の平坦部の間に配置された折り曲げ部を有し、前記複数の二次電池同士を繋ぐバスバと、
　を備えた電池モジュールにおいて、
　前記バスバは、異種金属同士を接合したクラッド材であり、かつ異種金属同士の接合端部である接合部は、前記一方の平坦部と前記他方の平坦部のそれぞれに配置されることを特徴とする電池モジュール。 A plurality of secondary batteries;
A bus bar having a pair of flat portions, a bent portion disposed between one flat portion and the other flat portion of the pair of flat portions, and connecting the plurality of secondary batteries;
In a battery module with
The bus bar is a clad material obtained by bonding different kinds of metals, and a bonding portion which is a bonding end portion of different kinds of metals is disposed on each of the one flat portion and the other flat portion. Battery module. 　請求項１に記載の電池モジュールにおいて、
　前記バスバは、前記一対の平坦部のそれぞれから立ち上がる一対の立ち上がり折り曲げ部と、
　前記一対の立ち上がり折り曲げ部同士を繋ぐＵ字折り曲げ部と、を有する電池モジュール。 The battery module according to claim 1,
The bus bar includes a pair of rising bent portions that rise from each of the pair of flat portions,
A battery module having a U-shaped bent portion that connects the pair of rising bent portions. 　請求項２に記載の電池モジュールにおいて、
　前記バスバは、電池の端子と接合される溶接部を有し、
　前記溶接部は、前記平坦部の前記接合部と重ならない位置に設けられている。 The battery module according to claim 2,
The bus bar has a welded portion joined to a battery terminal,
The welded portion is provided at a position that does not overlap the joint portion of the flat portion. 　請求項３に記載の電池モジュールにおいて、
　前記接合部は、前記一対の平坦部のうち、一方の前記平坦部から他方の前記平坦部に向かって、前記折り曲げ部を介して直線的に設けられていることを特徴とする電池モジュール。 The battery module according to claim 3, wherein
The battery module is characterized in that the joint portion is linearly provided through the bent portion from one flat portion to the other flat portion of the pair of flat portions. 　請求項１乃至４の何れかに記載の電池モジュールにおいて、
　前記異種金属は、それぞれアルミを主材とする金属と銅を主材とする金属からなることを特徴とする電池モジュール。 The battery module according to any one of claims 1 to 4,
The dissimilar metal comprises a metal mainly made of aluminum and a metal mainly made of copper, respectively.
PCT/JP2018/002838 2017-02-27 2018-01-30 Battery pack and busbar for battery pack Ceased WO2018155090A1 (en)

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