JP2008153204A - Secondary battery module - Google Patents

Secondary battery module Download PDF

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JP2008153204A
JP2008153204A JP2007298976A JP2007298976A JP2008153204A JP 2008153204 A JP2008153204 A JP 2008153204A JP 2007298976 A JP2007298976 A JP 2007298976A JP 2007298976 A JP2007298976 A JP 2007298976A JP 2008153204 A JP2008153204 A JP 2008153204A
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battery
disposed
secondary battery
lead plate
unit cell
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JP5037308B2 (en
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Mikio Oguma
幹男 小熊
Takenori Ishizu
竹規 石津
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Vehicle Energy Japan Inc
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Hitachi Vehicle Energy Ltd
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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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a secondary battery module capable of securing safety at the time of abnormality of a battery using film type secondary batteries. <P>SOLUTION: The battery module 30 is provided with 8 pieces of unit batteries 20 using a laminate film for the battery container. The 8 pieces of unit batteries 20 are arranged in laminate state. A lead plate 17 is arranged so as to be opposed to one side of the unit battery 21 out of the 8 pieces of the batteries. A pushing piece 14 is arranged between the unit battery 21 and the lead plate 17. The lead plate 17 has a narrow part 18 in which both sides in width direction to cross the longitudinal direction are cut out at the nearly central part in longitudinal direction. The center part 23 which shows the smallest width of the narrow part 18 constitutes a frangible section of the lead plate 17. When any of the unit batteries 20, 21 expands at the time of abnormality of the batteries, the pushing piece 14 moves and breaks the central part 23 of the lead plate 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は二次電池モジュールに係り、特に、可撓性部材を電池容器とした単一電池または積層状態で直列ないし直並列に接続され可撓性部材を電池容器とした複数個の単電池を有する二次電池モジュールに関する。   The present invention relates to a secondary battery module, and in particular, a single battery using a flexible member as a battery container or a plurality of single cells connected in series or series-parallel in a stacked state and using a flexible member as a battery container. The present invention relates to a secondary battery module.

従来、電気自動車やハイブリッド車などの大電流充放電用電源には、いわゆる円筒密閉型二次電池を複数個直列ないし直並列に接続した二次電池モジュールが用いられていた。一般に、このような大電流充放電用電源では、例えば、４０〜１００個の円筒密閉型二次電池が使用されている。   2. Description of the Related Art Conventionally, a secondary battery module in which a plurality of so-called cylindrical sealed secondary batteries are connected in series or in series and parallel has been used for a large current charging / discharging power source such as an electric vehicle or a hybrid vehicle. Generally, in such a large current charging / discharging power source, for example, 40 to 100 cylindrical sealed secondary batteries are used.

円筒密閉型二次電池に用いられる円筒型容器には、コスト低減のため、鉄系材料を用いるのが一般的である。ところが、鉄は比重が大きいため、二次電池の重量効率を上げる（軽量化を図る）上で大きな制約となっていた。この問題は、射出成形の樹脂製容器を用いた小型の密閉式鉛電池においても共通しており、重量がさほど軽くならない上に、肉厚の関係で体積効率を上げることが難しい、という問題があった。   In order to reduce costs, an iron-based material is generally used for a cylindrical container used for a cylindrical sealed secondary battery. However, since iron has a large specific gravity, it has been a major limitation in increasing the weight efficiency (reducing weight) of the secondary battery. This problem is common to small sealed lead-acid batteries using injection-molded resin containers, and it is difficult to increase volumetric efficiency due to wall thickness as well as the weight is not so light. there were.

二次電池の軽量化を図るため、古くからアルミニウム箔などがガスバリア層として内層に組み込まれた、いわゆるラミネートフィルム（以下、単にフィルムという。）等の可撓性部材を電池容器としたフィルム型二次電池（ラミネートセル）の技術が開示されている（例えば、特許文献１参照）。フィルム型二次電池を単電池として使用した二次電池モジュールでは、単電池が軽量化されているため、全体を軽量化することができる。一般に、フィルム型二次電池で二次電池モジュールを構成するには、直列ないし直並列に接続された複数個の単電池が積層状態で配設される。   In order to reduce the weight of the secondary battery, a film-type battery using a flexible member such as a so-called laminate film (hereinafter simply referred to as a film) in which an aluminum foil or the like is incorporated as a gas barrier layer in the inner layer for a long time. A secondary battery (laminate cell) technology is disclosed (see, for example, Patent Document 1). In a secondary battery module using a film-type secondary battery as a single battery, since the single battery is reduced in weight, the overall weight can be reduced. Generally, in order to form a secondary battery module with a film-type secondary battery, a plurality of single cells connected in series or in series and parallel are arranged in a stacked state.

また、二次電池においては、充電装置の故障や誤用などのために万一過充電状態となった場合や、高温環境下で使用された場合には、電池が異常状態となり、電池温度の異常な上昇に伴う電解液の気化や分解等で発生したガスにより電池内圧が上昇する。このような場合に備え、円筒密閉型二次電池には電池異常時に電流を遮断する電流遮断機構が組み込まれる。電流遮断機構では、例えば、電池内部に脆弱な接合部を形成しておき、内圧上昇時に接合部が破断することで電流が遮断される。また、有底筒状電池缶の開口部を封口する封口板の上部に温度ヒューズやＰＴＣ（Positive Temperature Coefficient）素子を配設して温度上昇時に電流を遮断する技術が開示されている（特許文献２参照）。ところが、従来の円筒密閉型二次電池では電流遮断機構を容易に備えることができるのに対して、角型電池缶を使用した薄型の角型二次電池では、体積効率の点から電池内に電流遮断機構を備えることが難しい。これを解決するために、例えば、角型電池缶に段差部を形成し、この段差部に温度ヒューズやＰＴＣ素子を配設する技術が開示されている（特許文献３参照）。   In the case of a secondary battery, if it becomes overcharged due to a failure or misuse of the charging device, or if it is used in a high temperature environment, the battery will be in an abnormal state and the battery temperature will be abnormal. The internal pressure of the battery rises due to gas generated by vaporization or decomposition of the electrolytic solution accompanying the rise. In preparation for such a case, the cylindrical sealed secondary battery incorporates a current interrupting mechanism that interrupts current when the battery is abnormal. In the current interrupting mechanism, for example, a weak joint is formed inside the battery, and the current is interrupted by breaking the joint when the internal pressure increases. In addition, a technique is disclosed in which a thermal fuse or a PTC (Positive Temperature Coefficient) element is provided on the upper part of a sealing plate that seals the opening of the bottomed cylindrical battery can to cut off the current when the temperature rises (Patent Document). 2). However, a conventional cylindrical sealed secondary battery can be easily provided with a current interrupting mechanism, whereas a thin prismatic secondary battery using a square battery can has a capacity efficiency in the battery. It is difficult to provide a current interruption mechanism. In order to solve this, for example, a technique is disclosed in which a step portion is formed in a rectangular battery can, and a thermal fuse or a PTC element is disposed on the step portion (see Patent Document 3).

特開昭６０−２３０３５４号公報JP-A-60-230354 特開２００４−１７８９９４号公報JP 2004-178994 A 特開２００４−１９９９９１号公報JP 2004-199991 A

しかしながら、上述したフィルム型二次電池では、電極群をフィルムで覆うだけの極めて簡単な構造のため、個々の単電池に電流遮断機構を内蔵することが難しい。また、フィルムが柔軟性を有しているため、特許文献３の技術のように段差部を形成することも難しい。このため、万一過充電状態となった場合等には、電流が流れ続けることとなり内圧を低減することができず、電池容器が膨張してしまう、という問題がある。このようなフィルム型二次電池を使用した二次電池モジュールでは、電池異常時の安全性を確保することが難しくなる。   However, since the above-described film type secondary battery has a very simple structure in which the electrode group is simply covered with a film, it is difficult to incorporate a current interruption mechanism in each single cell. Moreover, since the film has flexibility, it is difficult to form a stepped portion as in the technique of Patent Document 3. For this reason, in the event that an overcharged state occurs, there is a problem that the current continues to flow and the internal pressure cannot be reduced and the battery container expands. In a secondary battery module using such a film-type secondary battery, it is difficult to ensure safety when the battery is abnormal.

本発明は上記事案に鑑み、フィルム型二次電池を使用し電池異常時の安全性を確保することができる二次電池モジュールを提供することを課題とする。   An object of the present invention is to provide a secondary battery module that uses a film-type secondary battery and can ensure safety when the battery is abnormal.

上記課題を解決するために、本発明は、可撓性部材を電池容器とした単一電池または積層状態で直列ないし直並列に接続され可撓性部材を電池容器とした複数個の単電池を有する二次電池モジュールにおいて、一部に脆弱部を有し前記単一電池または前記複数個の単電池のうち一側に配設された単電池に対峙するように配置された接続部材と、前記単一電池または前記一側に配設された単電池と前記接続部材との間に配置され前記接続部材に接触可能な押しゴマとを備え、前記接続部材は、前記脆弱部を挟んで一方の端部が前記単一電池または前記一側に配設された単電池に接続されており、かつ、他方の端部が外部出力端子に接続されており、前記単一電池または前記複数個の単電池のいずれかが膨張したときに、前記押しゴマにより前記脆弱部が破断することを特徴とする。   In order to solve the above problems, the present invention provides a single battery using a flexible member as a battery container or a plurality of single cells connected in series or series-parallel in a stacked state and using the flexible member as a battery container. A secondary battery module having a connection member disposed so as to face a single cell or a single cell disposed on one side of the plurality of single cells, the fragile portion in part, A single battery or a single cell disposed on the one side and the connecting member, and a push sesame that can contact the connecting member, the connecting member sandwiching the weakened portion on one side An end is connected to the single battery or the single battery disposed on the one side, and the other end is connected to an external output terminal, and the single battery or the plurality of single cells are connected. When one of the batteries expands, Weak portion is characterized in that the fracture.

本発明の二次電池モジュールでは、通常時において、一部に脆弱部を有し単一電池または複数個の単電池のうち一側に配設された単電池に対峙するように配置された接続部材は、脆弱部を挟んで一方の端部が単一電池または一側に配設された単電池に接続され、かつ、他方の端部が外部出力端子に接続されているため、脆弱部を介して単一電池または単電池からの電力が外部出力端子へ出力される。一方、接続部材に接触可能な押しゴマが単一電池または一側に配設された単電池と接続部材との間に配置されているので、電池異常時に、単一電池または複数個の単電池のいずれかが膨張したときに、押しゴマが押圧されて移動して接続部材の脆弱部が破断し、単一電池または一側に配設された単電池および外部出力端子間の接続が断たれるため、二次電池モジュールの安全性を確保することができる。   In the secondary battery module of the present invention, in a normal state, the connection is arranged so as to confront a single battery or a single battery arranged on one side of a plurality of single cells, having a weakened part. The member has one end connected to a single battery or a single cell disposed on one side with the fragile portion in between, and the other end is connected to the external output terminal. The electric power from the single battery or the single battery is output to the external output terminal. On the other hand, since the push sesame that can contact the connection member is disposed between the single battery or the single battery disposed on one side and the connection member, a single battery or a plurality of single batteries in the event of a battery abnormality When either of these expands, the push sesame is pushed and moved to break the fragile portion of the connection member, and the connection between the single battery or the single battery arranged on one side and the external output terminal is broken Therefore, the safety of the secondary battery module can be ensured.

この場合において、接続部材の押しゴマと反対側に配置され接続部材を支持する支持部材と、脆弱部が破断したときに該脆弱部の両方の破断端部を離隔する離隔部材とを更に備え、押しゴマと支持部材とが脆弱部に対して反対側に位置しており、離隔部材が支持部材または押しゴマの接続部材側で脆弱部に対応する位置に配置されているようにすれば、離隔部材が破断した脆弱部の両方の破断端部を離隔するため、破断した脆弱部の破断端部同士が再度接触することを防止することができる。このとき、離隔部材が押しゴマまたは支持部材と一体に形成されていてもよい。また、単一電池または一側に配設された単電池に剛性を有する樹脂板が固着されていれば、単電池の膨張による変形に偏りが生じても樹脂板を介して押しゴマを確実に押すことができる。また、一側に配設された単電池の電池容量を、複数個の単電池のうち一側に配設された単電池以外の単電池の電池容量より小さくすれば、電池異常時に一側に配設された単電池の内圧上昇が他の単電池より早期に起こるため、押しゴマの作動を確実にすることができる。   In this case, it further includes a support member that is disposed on the opposite side of the connecting member to the pushing sesame and supports the connecting member, and a separating member that separates both the broken end portions of the fragile portion when the fragile portion is broken. If the push sesame and the support member are located on the opposite side with respect to the fragile portion, and the separation member is disposed at a position corresponding to the fragile portion on the connection member side of the support member or the push sesame, the separation is provided. Since both the broken end portions of the fragile portion where the member is broken are separated from each other, the broken end portions of the broken fragile portion can be prevented from contacting each other again. At this time, the separation member may be formed integrally with the push sesame or the support member. In addition, if a rigid resin plate is fixed to a single cell or a single cell disposed on one side, even if the deformation due to expansion of the single cell is biased, it is possible to securely push the sesame through the resin plate. Can be pressed. In addition, if the battery capacity of a single battery arranged on one side is made smaller than the battery capacity of a single battery other than the single battery arranged on one side among the plurality of single batteries, the battery capacity is set to one side in the event of a battery abnormality Since the increase in the internal pressure of the arranged unit cell occurs earlier than other unit cells, the operation of the push sesame can be ensured.

本発明によれば、接続部材に接触可能な押しゴマが単一電池または一側に配設された単電池とおよび接続部材との間に配置されているので、電池異常時に、単一電池または複数個の単電池のいずれかが膨張したときに、押しゴマが押圧されて移動して接続部材の脆弱部が破断し、単一電池または一側に配設された単電池および外部出力端子間の接続が断たれるため、二次電池モジュールの安全性を確保することができる、という効果を得ることができる。   According to the present invention, the push sesame that can contact the connection member is disposed between the single battery or the single battery disposed on one side and the connection member. When any one of the plurality of cells expands, the pushing sesame is pushed and moved to break the fragile portion of the connecting member, and between the single cell or the single cell arranged on one side and the external output terminal As a result, the safety of the secondary battery module can be ensured.

以下、図面を参照して、本発明に係る二次電池モジュールの実施の形態について説明する。   Hereinafter, embodiments of a secondary battery module according to the present invention will be described with reference to the drawings.

（構成）
図１に示すように、本実施形態の二次電池モジュール（以下、単にモジュールという。）３０は、電池容器に可撓性部材としてのラミネートフィルムが用いられたフィルム型リチウムイオン二次電池（以下、単電池という。）２０を８個備えている。モジュール３０では、８個の単電池２０および後述するリード板等の全体がアルミニウム合金製の図示を省略したフレームに組み込まれている。 (Constitution)
As shown in FIG. 1, a secondary battery module (hereinafter simply referred to as a module) 30 of the present embodiment is a film type lithium ion secondary battery (hereinafter referred to as a flexible film) in which a laminate film as a flexible member is used. , Which is referred to as a single cell). In the module 30, the entire eight unit cells 20 and a lead plate, which will be described later, are incorporated in an aluminum alloy frame (not shown).

単電池２０は、対向する２面に平面部を有している。８個の単電池２０は正負極端子がそれぞれ交互となるように配設されている。隣り合う単電池２０は平面部同士が対向するように配設されており、隣り合う単電池２０同士が両面テープで貼り合わされている。すなわち、８個の単電池２０は、積層状態で配設されている。隣り合う単電池２０の端子は接続部材であるニッケル板を用いて抵抗溶接により接合されており、８個の単電池２０は直列に接続されている。８個の単電池２０のうち一側に配設された単電池２１は、電池容量が他の７個の単電池２０より小さくされている。本例では、単電池２１の電池容量が単電池２０の電池容量より５％小さくされている。一方、８個の単電池のうち他側（単電池２１と反対側）に配置された単電池２０の正極端子は、モジュール３０の正極外部端子１５に接続されている。他側に配置された単電池２０はモジュール３０の図示を省略したフレームに支持されている。   The unit cell 20 has flat portions on two opposing surfaces. The eight unit cells 20 are arranged so that the positive and negative terminals are alternately arranged. Adjacent unit cells 20 are arranged so that the flat portions thereof are opposed to each other, and the adjacent unit cells 20 are bonded to each other with a double-sided tape. That is, eight unit cells 20 are arranged in a stacked state. Terminals of adjacent unit cells 20 are joined by resistance welding using a nickel plate as a connecting member, and the eight unit cells 20 are connected in series. The unit cell 21 arranged on one side among the eight unit cells 20 has a battery capacity smaller than that of the other seven unit cells 20. In this example, the battery capacity of the single battery 21 is 5% smaller than the battery capacity of the single battery 20. On the other hand, the positive terminal of the unit cell 20 arranged on the other side (the side opposite to the unit cell 21) among the eight unit cells is connected to the positive external terminal 15 of the module 30. The unit cells 20 arranged on the other side are supported by a frame in which the module 30 is not shown.

単電池２１には、隣り合う単電池２０と反対側の平面部の略中央部に、単電池２０、２１のいずれかが膨張したときに膨張力による押圧力を受ける円板状の受圧板１３が両面粘着テープ等で固着されている。受圧板１３には、フェノール樹脂などの不導電性で剛性を有する材質が使用されている。受圧板１３の大きさ（面積）は、単電池２１の平面部の大きさより小さく設定されている。受圧板１３の単電池２１と反対側には、単電池２０、２１が膨張したときに電流を遮断するための押しゴマ１４が配置されている。押しゴマ１４は、図示を省略したフレームに支持された図示しないガイド部材に支持されている。押しゴマ１４には、不導電性の材質が使用されている。押しゴマ１４は、一面が受圧板１３に当接可能な円板状に形成されている。押しゴマ１４の大きさ（面積）は、受圧板１３より小さく設定されている。   The unit cell 21 includes a disk-shaped pressure receiving plate 13 that receives a pressing force due to an expansion force when one of the unit cells 20, 21 expands at a substantially central portion of a plane portion opposite to the adjacent unit cell 20. Is fixed with a double-sided adhesive tape or the like. The pressure receiving plate 13 is made of a non-conductive and rigid material such as phenol resin. The size (area) of the pressure receiving plate 13 is set smaller than the size of the planar portion of the unit cell 21. On the opposite side of the pressure receiving plate 13 from the unit cell 21, there is disposed a push block 14 for interrupting the current when the unit cells 20, 21 expand. The push sesame 14 is supported by a guide member (not shown) supported by a frame (not shown). The push sesame 14 is made of a non-conductive material. The pressing sesame 14 is formed in a disc shape whose one surface can contact the pressure receiving plate 13. The size (area) of the pressing sesame 14 is set smaller than the pressure receiving plate 13.

押しゴマ１４の受圧板１３と反対側には、アルミニウム合金製で矩形状の接続部材としてのリード板１７が配置されている。すなわち、リード板１７は単電池２１と対峙するように配置されている。リード板１７の長手方向の略中央部には、図２に示すように、長手方向と直交する幅方向の両側にプレスによる抜き加工で三角状の切り欠きが形成されている。すなわち、リード板１７は略中央部に狭隘部１８を有している。狭隘部１８では、最小幅を示す中央部２３がリード板１７の脆弱部を構成する。リード板１７には厚さ１ｍｍのアルミニウム合金板Ａ１０５０が使用されており、中央部２３の幅が１ｍｍに設定されている。このため、リード板１７の中央部２３の断面積は１ｍｍ２である。リード板１７の中央部２３より上側は、押しゴマ１４に対応するように配置されている。 A lead plate 17 made of an aluminum alloy and serving as a rectangular connecting member is disposed on the side opposite to the pressure receiving plate 13 of the push sesame 14. That is, the lead plate 17 is disposed so as to face the unit cell 21. As shown in FIG. 2, triangular leads are formed by punching on both sides of the lead plate 17 in the width direction perpendicular to the longitudinal direction. That is, the lead plate 17 has a narrowed portion 18 at a substantially central portion. In the narrow portion 18, the central portion 23 indicating the minimum width constitutes a fragile portion of the lead plate 17. An aluminum alloy plate A1050 having a thickness of 1 mm is used for the lead plate 17, and the width of the central portion 23 is set to 1 mm. Therefore, the cross-sectional area of the central portion 23 of the lead plate 17 is 1 mm 2. The upper side of the center part 23 of the lead plate 17 is disposed so as to correspond to the push sesame 14.

リード板１７の押しゴマ１４と反対側には、リード板１７を支持する支持部材１９が配置されている。支持部材１９は円形状に形成されており、フェノール樹脂等の不導電性の材質が使用されている。支持部材１９の一面側には、リード板１７が中央部２３より下側の部分で支持されている。このため、押しゴマ１４と支持部材１９とがリード板１７の中央部２３に対して上下反対側に位置している。支持部材１９の他面側およびリード板１７の中央部２３より上側の部分は、図示を省略したフレームに支持されている。支持部材１９は、リード板１７側の上端に離隔部材としての突起部２２を有している。突起部２２は支持部材１９と一体に形成されている。突起部２２は、舌状でリード板１７の中央部２３に対応する位置に配置されている。換言すれば、突起部２２は中央部２３を含む狭隘部１８に接するように配置されている。   A support member 19 that supports the lead plate 17 is disposed on the opposite side of the lead plate 17 from the push block 14. The support member 19 is formed in a circular shape, and a nonconductive material such as a phenol resin is used. On one surface side of the support member 19, the lead plate 17 is supported by a portion below the center portion 23. For this reason, the push sesame 14 and the support member 19 are positioned on the opposite sides with respect to the central portion 23 of the lead plate 17. The other side of the support member 19 and the portion above the central portion 23 of the lead plate 17 are supported by a frame not shown. The support member 19 has a protrusion 22 as a separation member at the upper end on the lead plate 17 side. The protrusion 22 is formed integrally with the support member 19. The protrusion 22 is tongue-shaped and is disposed at a position corresponding to the central portion 23 of the lead plate 17. In other words, the protruding portion 22 is disposed so as to contact the narrow portion 18 including the central portion 23.

リード板１７は、中央部２３を挟んで一方の端部が単電池２１の負極端子に接続されており、他方の端部が負極外部端子１６に接続されている。このため、中央部２３を含むリード板１７を介して負極外部端子１６と単電池２１の負極端子とが接続され、単電池２１の負極端子、リード板１７、負極外部端子１６で負極側の導電経路が構成される。   The lead plate 17 has one end connected to the negative electrode terminal of the unit cell 21 with the central portion 23 interposed therebetween, and the other end connected to the negative electrode external terminal 16. For this reason, the negative electrode external terminal 16 and the negative electrode terminal of the unit cell 21 are connected via the lead plate 17 including the central portion 23, and the negative electrode side of the unit cell 21, the lead plate 17, and the negative electrode external terminal 16 are electrically connected to the negative electrode side. A route is constructed.

モジュール３０に用いられる単電池２０は、図３に示すように、外装体（電池容器）に２枚の矩形状のラミネートフィルム（以下、単に、フィルムという。）１、１’が使用されている。フィルム１、１’は、ポリプロピレン（ＰＰ）フィルム−アルミニウム箔−ポリエチレンテレフタレート（ＰＥＴ）フィルムが重ね合わされており、厚さ約１２０μｍに設定されている。フィルム１、１’間には、電極群４が封入されている。電極群４の一側に位置するフィルム１’は平面状に形成された平面状フィルムであり、他側に位置するフィルム１は略中央部が凸状に成形されたカップ状フィルムである。フィルム１’の対向する２辺には、正極端子２及び負極端子３がそれぞれ２つずつ先端部を互いに反対方向の外側に突出させて配設されている。フィルム１、１’の周縁部の４辺は溶着部１０が熱溶着で封止されており、単電池２０は密閉構造とされている。各正極端子２および各負極端子３は溶着部１０に封止材１１を介して挟み込まれている。   As shown in FIG. 3, the unit cell 20 used in the module 30 uses two rectangular laminate films (hereinafter simply referred to as films) 1, 1 ′ for an outer package (battery container). . The films 1 and 1 ′ are formed by superimposing a polypropylene (PP) film, an aluminum foil, and a polyethylene terephthalate (PET) film, and have a thickness of about 120 μm. An electrode group 4 is enclosed between the films 1 and 1 '. The film 1 ′ located on one side of the electrode group 4 is a flat film formed in a flat shape, and the film 1 located on the other side is a cup-shaped film having a substantially central portion formed into a convex shape. Two positive electrode terminals 2 and two negative electrode terminals 3 are arranged on two opposite sides of the film 1 'so that the tip portions protrude outward in opposite directions. The welded part 10 is sealed by thermal welding at the four sides of the peripheral part of the films 1 and 1 ′, and the unit cell 20 has a sealed structure. Each positive electrode terminal 2 and each negative electrode terminal 3 are sandwiched between the welding portions 10 via a sealing material 11.

電極群４は、正極板１９枚と負極板２０枚とが交互に重ねられている。正極板は、熱溶着で袋状に成形されたセパレータに挿入されている。セパレータには、例えば、厚さ２５μｍ、幅１００ｍｍのポリエチレン製多孔膜が用いられている。正極板および負極板は、正極端子２および負極端子３が互いに反対方向に導出されるように重ねられている。正極端子２および負極端子３は、フィルム１、１’の対向する２辺間の中心線Ｍに対して対称となるように配置されている。２つの正極端子２および２つの負極端子３は、正極ストラップ部６および負極ストラップ部８の中心（対向する２辺の中心）を通り中心線Ｍと直交する中心線Ｎに対してそれぞれ対称の位置に形成されている。   In the electrode group 4, 19 positive plates and 20 negative plates are alternately stacked. The positive electrode plate is inserted into a separator formed into a bag shape by heat welding. For example, a polyethylene porous film having a thickness of 25 μm and a width of 100 mm is used as the separator. The positive electrode plate and the negative electrode plate are overlapped so that the positive electrode terminal 2 and the negative electrode terminal 3 are led out in directions opposite to each other. The positive electrode terminal 2 and the negative electrode terminal 3 are arranged so as to be symmetric with respect to the center line M between two opposing sides of the films 1, 1 ′. The two positive terminals 2 and the two negative terminals 3 are symmetrical with respect to a center line N passing through the centers (centers of two opposing sides) of the positive strap section 6 and the negative strap section 8 and orthogonal to the center line M. Is formed.

正極端子２と一体に形成された正極ストラップ部６には、厚さ０．３ｍｍのアルミニウム合金Ａ３００３−Ｈ１２が用いられており、電解液に接するおそれのない正極端子２の部分（電池外部に露出した部分）にのみ、片面に厚さ０．１ｍｍのニッケル板がクラッド加工されている。一方、負極端子３と一体に形成された負極ストラップ部８には、厚さ０．３ｍｍの銅板Ｃ１０２０−１／２Ｈが用いられており、電池外部に露出した負極端子３の部分にのみ両面に厚さ０．０５ｍｍのニッケル板がクラッド加工されている。正極ストラップ部６、負極ストラップ部８は、正極集電体の無地部７、負極集電体の無地部９にそれぞれ超音波溶接されている。正極端子２および負極端子３には、導出幅方向の略中央部に位置合わせ用の円形状の基準穴５が形成されている。このため、正極端子２、負極端子３にそれぞれ形成された基準穴５は、中心線Ｍに対して対称となるように形成されている。正極端子２、負極端子３には、導出幅方向の一側にそれぞれ矩形状の切り欠き部２’、切り欠き部３’が形成されている。電極群４の厚さはおよそ４．８ｍｍである。   The positive electrode strap portion 6 formed integrally with the positive electrode terminal 2 is made of an aluminum alloy A3003-H12 having a thickness of 0.3 mm. The portion of the positive electrode terminal 2 that is not in contact with the electrolytic solution (exposed to the outside of the battery). The nickel plate having a thickness of 0.1 mm is clad on one side only. On the other hand, a copper plate C1020-1 / 2H having a thickness of 0.3 mm is used for the negative electrode strap portion 8 formed integrally with the negative electrode terminal 3, and only on both sides of the negative electrode terminal 3 exposed to the outside of the battery. A nickel plate having a thickness of 0.05 mm is clad. The positive strap portion 6 and the negative strap portion 8 are ultrasonically welded to the plain portion 7 of the positive electrode current collector and the plain portion 9 of the negative electrode current collector, respectively. The positive terminal 2 and the negative terminal 3 are formed with a circular reference hole 5 for alignment at a substantially central portion in the lead-out width direction. For this reason, the reference holes 5 respectively formed in the positive electrode terminal 2 and the negative electrode terminal 3 are formed so as to be symmetric with respect to the center line M. The positive electrode terminal 2 and the negative electrode terminal 3 are respectively formed with a rectangular cutout portion 2 ′ and a cutout portion 3 ′ on one side in the lead-out width direction. The thickness of the electrode group 4 is approximately 4.8 mm.

単電池２０の組立時には、電極群４がフィルム１の略中央部に載置され、フィルム１’が載せられて、４辺の溶着部が熱溶着される。この際、一部熱溶着せずに残しておいたフィルム１、１’の合わせ面から注射器を用いて所定量の電解液が注入された後、再度この部分が熱溶着されて密封され、単電池２０を完成させた。溶着部１０の幅は、本例では、全周にわたって約１０ｍｍに設定されている。一連の組立作業の間、基準穴５にピン（不図示）を挿入して正極端子２、負極端子３を位置決めすることで、所要の寸法精度が得られる。正極端子２、負極端子３は、それぞれ正極ストラップ部６、負極ストラップ部８を介してフィルム状容器の対向する２辺から２つずつ導出されている。なお、作製した単電池２０の電池容量は約３．２Ａｈである。また、単電池２１は、正極板１８枚と負極板１９枚とを用いて電極群４を構成する以外は、単電池２０と同様にして作製されたものである。   At the time of assembling the unit cell 20, the electrode group 4 is placed at the substantially central portion of the film 1, the film 1 'is placed, and the four sides of the welded portion are thermally welded. At this time, after a predetermined amount of electrolytic solution was injected from the mating surfaces of the films 1 and 1 ′ which had not been thermally welded, using a syringe, this portion was again thermally welded and sealed. The battery 20 was completed. In this example, the width of the welded portion 10 is set to about 10 mm over the entire circumference. By inserting a pin (not shown) into the reference hole 5 and positioning the positive electrode terminal 2 and the negative electrode terminal 3 during a series of assembly operations, the required dimensional accuracy can be obtained. Two positive electrode terminals 2 and two negative electrode terminals 3 are led out from two opposite sides of the film-like container via a positive electrode strap portion 6 and a negative electrode strap portion 8, respectively. The produced battery 20 has a battery capacity of about 3.2 Ah. The unit cell 21 is manufactured in the same manner as the unit cell 20 except that the electrode group 4 is composed of 18 positive plates and 19 negative plates.

電極群４を構成する正極板の作製時には、正極活物質としてマンガン酸リチウム等のリチウム遷移金属複酸化物と、導電材として炭素粉末と、結着剤としてポリフッ化ビニリデンとが、溶媒であるＮ−メチル−２−ピロリドンに分散して混合されてスラリが作製される。このスラリが正極集電体である厚さ２０μｍのアルミニウム箔の両面に塗布され、乾燥後、プレスされて一体化される。その後、幅９４ｍｍに切断されて短冊状の正極板が作製される。塗工部の幅８６ｍｍ、無地部（図１の符号７）の幅１０ｍｍに設定されている。   At the time of producing the positive electrode plate constituting the electrode group 4, a lithium transition metal double oxide such as lithium manganate as a positive electrode active material, carbon powder as a conductive material, and polyvinylidene fluoride as a binder are N as solvents. -A slurry is prepared by dispersing and mixing in methyl-2-pyrrolidone. This slurry is applied to both surfaces of a 20 μm thick aluminum foil as a positive electrode current collector, dried, pressed and integrated. Thereafter, it is cut into a width of 94 mm to produce a strip-like positive electrode plate. The width of the coated portion is set to 86 mm, and the width of the plain portion (reference numeral 7 in FIG. 1) is set to 10 mm.

一方、負極板の作製時には、負極活物質として炭素粒子と、結着剤としてポリフッ化ビニリデンとが溶媒であるＮ−メチル−２−ピロリドンに投入され混合されて、スラリ状の溶液が作製される。このスラリが負極集電体である厚さ１０μｍの銅箔の両面に塗布され、乾燥後、プレスされて一体化される。その後、幅９６ｍｍに切断されて負極板が作製される。塗工部の幅８８ｍｍ、無地部（図１の符号９）の幅１０ｍｍに設定されている。   On the other hand, at the time of producing the negative electrode plate, carbon particles as a negative electrode active material and polyvinylidene fluoride as a binder are charged and mixed in N-methyl-2-pyrrolidone as a solvent to produce a slurry solution. . This slurry is applied to both sides of a 10 μm thick copper foil as a negative electrode current collector, dried, pressed and integrated. Then, it cut | disconnects to width 96mm and a negative electrode plate is produced. The width of the coated part is set to 88 mm, and the width of the plain part (reference numeral 9 in FIG. 1) is set to 10 mm.

（作用等）
次に、本実施形態のモジュール３０の作用等について説明する。 (Action etc.)
Next, the operation and the like of the module 30 of the present embodiment will be described.

本実施形態のモジュール３０では、リード板１７が、中央部２３を挟んで一方の端部を単電池２１の負極端子に接続され、他方の端部を負極外部端子１６に接続されている。このため、通常使用時には、単電池２０、２１からの電力がリード板１７を介して負極外部端子１６へ出力される。   In the module 30 of the present embodiment, the lead plate 17 has one end connected to the negative electrode terminal of the unit cell 21 with the central portion 23 in between, and the other end connected to the negative external terminal 16. For this reason, during normal use, power from the cells 20 and 21 is output to the negative external terminal 16 via the lead plate 17.

また、本実施形態のモジュール３０では、単電池２１に対峙するようにリード板１７が配置され、単電池２１およびリード板１７の間に押しゴマ１４が配置されている。すなわち、単電池２１、押しゴマ１４、リード板１７がこの順で配設されている。モジュール３０が、万一装置の故障などにより過充電状態になった場合や、高温環境下で使用された場合には、電池が異常状態となり、電解液の気化や分解等により電池内部でガスが発生し、内圧が上昇する。内圧上昇により単電池２０、２１のいずれかが膨張すると、単電池２０のうち単電池２１と反対側に配置された単電池２０がモジュール３０の図示を省略したフレームに支持されているため、受圧板１３が押しゴマ１４側に押圧されて押しゴマ１４に当接する。このため、押しゴマ１４がリード板１７側に押圧されて移動してリード板１７が押しゴマ１４で押される。これにより、リード板１７の中央部２３が破断するので、単電池２１と負極外部端子１６との接続が断たれ、モジュール３０の負極側導電経路が遮断される。従って、モジュール３０では、それ以上の通電が防止されるので、内圧上昇時の安全性を確保することができる。   Further, in the module 30 of the present embodiment, the lead plate 17 is disposed so as to face the unit cell 21, and the push block 14 is disposed between the unit cell 21 and the lead plate 17. That is, the unit cell 21, the pusher 14 and the lead plate 17 are arranged in this order. If the module 30 is overcharged due to a failure of the device or if it is used in a high temperature environment, the battery will be in an abnormal state, and gas will be generated inside the battery due to evaporation or decomposition of the electrolyte. Occurs and the internal pressure rises. When one of the cells 20, 21 expands due to the increase in internal pressure, the cell 20 disposed on the opposite side of the cell 20 from the cell 20 is supported by the frame (not shown) of the module 30. The plate 13 is pressed toward the pressing sesame 14 and comes into contact with the pressing sesame 14. For this reason, the pushing sesame 14 is pressed and moved toward the lead plate 17, and the lead plate 17 is pushed by the pushing sesame 14. Thereby, the central portion 23 of the lead plate 17 is broken, so that the connection between the unit cell 21 and the negative electrode external terminal 16 is cut off, and the negative electrode side conductive path of the module 30 is cut off. Accordingly, in the module 30, further energization is prevented, and safety when the internal pressure is increased can be ensured.

更に、本実施形態のモジュール３０では、支持部材１９がリード板１７側の上端に舌状の突起部２２を有しており、突起部２２がリード板１７の中央部２３を含む狭隘部１８に接するように配置されている。このため、中央部２３が破断された後に、破断した中央部２３の上側の破断端部が突起部２２を介して下側の破断端部と反対側に回り込む。これにより、破断した中央部２３の破断端部同士を突起部２２により離隔することができる。仮に電池容器のフィルムの破損や電池温度の低下等により内圧が低減しても、破断したリード板１７が弾力性で元の状態に戻ることがないので、破断端部同士が再び接触して電流が流れることを防止することができる。更に、本実施形態のモジュール３０では、支持部材１９がリード板１７の押しゴマ１４と反対側に配置されており、押しゴマ１４と支持部材１９とがリード板１７の中央部２３に対して上下反対側に位置している。このため、単電池２０、２１のいずれかが膨張したときには、押しゴマ１４が押圧されることで確実に中央部２３を破断することができる。   Further, in the module 30 of the present embodiment, the support member 19 has a tongue-like protrusion 22 at the upper end on the lead plate 17 side, and the protrusion 22 is formed on the narrow portion 18 including the central portion 23 of the lead plate 17. It is arranged to touch. For this reason, after the central portion 23 is ruptured, the upper rupture end portion of the ruptured central portion 23 wraps around the protruding portion 22 to the side opposite to the lower rupture end portion. Thereby, the fracture | rupture end parts of the fracture | ruptured center part 23 can be spaced apart by the projection part 22. FIG. Even if the internal pressure is reduced due to damage to the film of the battery container or lowering of the battery temperature, the broken lead plate 17 does not return to its original state due to elasticity. Can be prevented from flowing. Furthermore, in the module 30 of the present embodiment, the support member 19 is disposed on the opposite side of the lead plate 17 from the push block 14, and the push block 14 and the support member 19 are vertically moved with respect to the central portion 23 of the lead plate 17. Located on the opposite side. For this reason, when any one of the cells 20 and 21 expands, the central portion 23 can be reliably broken by pressing the push sesame 14.

また更に、単電池２０の電池容量にはある程度のばらつきを生じていることが避けられないため、モジュール３０に組み込まれた単電池のうち押しゴマ１４に当接可能な単電池の電池容量が偶然大きかった場合には、例えば、過充電状態になっても当該電池容量の大きな単電池ではガス発生が遅れることがある。このため、単電池２０のいずれかが膨張しても押圧力が押しゴマ１４に十分に伝達されず、押しゴマ１４の作動で電流が遮断される前に、他の比較的電池容量の小さい単電池が発火や内圧上昇による破裂に至る可能性がある。本実施形態のモジュール３０では、押しゴマ１４に当接可能な単電池２１の電池容量が他の単電池２０より小さくされている。このため、過充電状態等では単電池２１の内圧上昇が他の単電池２０より早くなるので、押しゴマ１４に単電池２１の膨張による押圧力が伝わることで確実に充電電流を遮断することができる。また、本実施形態のモジュール３０では、単電池２０の電極群４が正極板および負極板が重ね合わされた積層式で形成されている。このため、正極板および負極板の構成枚数を減少することで単電池２０より電池容量の小さい単電池２１を容易に作製することができる。   Furthermore, since it is inevitable that the battery capacity of the unit cell 20 has a certain degree of variation, the unit battery capacity that can contact the push sesame 14 out of the unit cells incorporated in the module 30 is coincidental. If it is large, for example, even in an overcharged state, the unit cell having a large battery capacity may delay gas generation. For this reason, even if any one of the unit cells 20 expands, the pressing force is not sufficiently transmitted to the pressing sesame 14, and before the current is interrupted by the operation of the pressing sesame 14, another unit having a relatively small battery capacity. Batteries can ignite or burst due to increased internal pressure. In the module 30 of the present embodiment, the battery capacity of the unit cell 21 that can abut against the push sesame 14 is made smaller than that of the other unit cells 20. For this reason, in the overcharged state or the like, the increase in the internal pressure of the unit cell 21 is faster than that of the other unit cells 20. it can. Moreover, in the module 30 of this embodiment, the electrode group 4 of the unit cell 20 is formed by a stacked type in which a positive electrode plate and a negative electrode plate are overlapped. For this reason, the unit cell 21 having a smaller battery capacity than the unit cell 20 can be easily manufactured by reducing the number of components of the positive electrode plate and the negative electrode plate.

従来二次電池モジュールを構成する単電池にフィルム型二次電池を使用する場合、フィルム形二次電池が電極群をフィルムで覆うだけの極めて簡単な構造のため、個々の単電池に温度ヒューズやＰＴＣ素子等の電流遮断機構を内蔵することが難しい。このため、万一過充電状態となった場合等には、電流が流れ続けることとなり内圧を低減することができず、電池容器が膨張してしまい、電池異常時の安全性を確保することが難しい。これを解決するために、本発明者らは、既に、ふたつの接続部材の接合部を単電池の膨張力によって破断させる機構を組み込んだモジュール構造を提案している。ところが、この構造では、ふたつの接続部材を抵抗溶接等の方法で接合する際のばらつきにより接合面積が変動することがあるため、作動圧力が安定しにくくなり、確実な動作保証が難しくなることがある。本実施形態は、これらの問題を解決することができるモジュール３０である。   Conventionally, when a film-type secondary battery is used as a unit cell constituting a secondary battery module, the film-type secondary battery has an extremely simple structure in which the electrode group is covered with a film. It is difficult to incorporate a current interruption mechanism such as a PTC element. For this reason, in the event of an overcharged state, etc., current will continue to flow, the internal pressure cannot be reduced, and the battery container will expand, ensuring safety in the event of battery abnormality. difficult. In order to solve this, the present inventors have already proposed a module structure in which a mechanism for breaking the joint portion of the two connecting members by the expansion force of the unit cell is incorporated. However, in this structure, the joining area may vary due to variations in joining the two connecting members by resistance welding or the like, so that the operating pressure is difficult to stabilize, and it is difficult to ensure reliable operation. is there. The present embodiment is a module 30 that can solve these problems.

なお、本実施形態では、単電池２１の押しゴマ１４側の平面部に受圧板１３を固着する例を示したが、本発明はこれに限定されるものではなく、単電池２１の平面部が直接押しゴマ１４に当接するようにしてもよい。押しゴマ１４より面積が大きく、剛性を有する受圧板１３を介して押しゴマ１４を押す構造とすることにより、単電池２０、２１のいずれかが膨張したときの膨張力が有効に押しゴマ１４に伝達されるので、電流遮断を確実に行うことができる。また、本実施形態では、受圧板１３、押しゴマ１４に不導電性の材質を例示したが、本発明はこれに限定されるものではなく、例えば、フィルム１、１’が不導電性であれば、受圧板１３にアルミニウム合金製の薄板等の導電性の材質を使用してもよい。   In the present embodiment, an example in which the pressure receiving plate 13 is fixed to the flat portion of the unit cell 21 on the side of the pressing sesame 14 is shown, but the present invention is not limited to this, and the plane unit of the unit cell 21 is You may make it contact | abut to the pushing sesame 14 directly. By adopting a structure in which the pressing sesame 14 is pushed through the pressure receiving plate 13 having a larger area and rigidity than the pressing sesame 14, the expansion force when any of the cells 20, 21 expands is effectively applied to the pressing sesame 14. Since it is transmitted, current interruption can be reliably performed. Further, in the present embodiment, the non-conductive material is exemplified for the pressure-receiving plate 13 and the pressing sesame 14. However, the present invention is not limited to this. For example, the films 1 and 1 ′ may be non-conductive. For example, a conductive material such as a thin plate made of aluminum alloy may be used for the pressure receiving plate 13.

また、本実施形態では、リード板１７がプレスによる抜き加工で三角状の切り欠きを形成した狭隘部１８を有する例を示したが、本発明はこれに限定されるものではなく、脆弱部が形成されていればよい。例えば、矩形状の切り欠きを形成するようにしてもよく、切り欠きを形成することに代えて厚さを小さくするようにしてもよい。また、切り欠きの形成方法についても特に制限されるものではないが、本実施形態で用いた抜き加工等の方法であれば、寸法安定性に優れることから、作動圧力（リード板１７が破断するときの圧力）を安定化させることができ、確実な動作保証をすることができる。   In the present embodiment, the lead plate 17 has an example having the narrow portion 18 in which a triangular notch is formed by punching with a press. However, the present invention is not limited to this, and the fragile portion is not limited to this. It only has to be formed. For example, a rectangular cutout may be formed, or the thickness may be reduced instead of forming the cutout. Further, the method for forming the notch is not particularly limited, but the method such as the punching process used in the present embodiment is excellent in dimensional stability, so that the operating pressure (the lead plate 17 is broken). Pressure) can be stabilized, and reliable operation can be guaranteed.

更に、本実施形態では、リード板１７の一端を負極外部端子１６に接続し、他端を単電池２１の負極端子に接続して負極側の導電経路を構成する例を示したが、本発明はこれに限定されるものではない。例えば、押しゴマ１４を使用した電流遮断機構を正極側に設けることも可能である。この場合には、リード板１７の一端を単電池２１と反対側に配設された単電池２０の正極端子に接続し、他端を正極外部端子１５に接続すればよい。   Furthermore, in the present embodiment, an example is shown in which one end of the lead plate 17 is connected to the negative electrode external terminal 16 and the other end is connected to the negative electrode terminal of the unit cell 21 to configure the negative electrode side conductive path. Is not limited to this. For example, it is possible to provide a current interruption mechanism using the push sesame 14 on the positive electrode side. In this case, one end of the lead plate 17 may be connected to the positive terminal of the unit cell 20 disposed on the side opposite to the unit cell 21, and the other end may be connected to the positive electrode external terminal 15.

また更に、本実施形態では、単電池２１の電池容量を単電池２０より５％小さくする例を示したが、本発明はこれに限定されるものではない。電池容量差が３％に満たないと単電池間の容量ばらつきの関係で確実に電池容量差を確保（単電池２１の電池容量を単電池２０より小さく）することが難しくなり、反対に、電池容量差が９％を超えると単電池間の電池容量差が大きくなりすぎ、電池容量の小さい電池ほど充放電時の負荷が大きくなりモジュール３０全体として寿命性能を損なうので、電池容量差を３〜９％の範囲とすることが望ましい。また、本実施形態では、正極板および負極板を積層した積層式の電極群４を例示したが、本発明はこれに制限されるものではなく、正極板および負極板を捲回した捲回式の電極群を用いるようにしてもよい。この場合には、捲回する正極板および負極板の長さを短くすることで、単電池２１の電池容量を単電池２０より小さくすることができる。   Furthermore, in the present embodiment, an example in which the battery capacity of the unit cell 21 is 5% smaller than that of the unit cell 20 has been shown, but the present invention is not limited to this. If the battery capacity difference is less than 3%, it is difficult to ensure the battery capacity difference (the battery capacity of the unit cell 21 is smaller than that of the unit cell 20) due to the capacity variation between the unit cells. When the capacity difference exceeds 9%, the battery capacity difference between the single cells becomes too large, and the smaller the battery capacity, the larger the load at the time of charging / discharging and the life performance of the module 30 is impaired. A range of 9% is desirable. Further, in the present embodiment, the laminated electrode group 4 in which the positive electrode plate and the negative electrode plate are laminated is illustrated, but the present invention is not limited to this, and the wound type in which the positive electrode plate and the negative electrode plate are wound. These electrode groups may be used. In this case, the battery capacity of the unit cell 21 can be made smaller than that of the unit cell 20 by shortening the lengths of the positive electrode plate and the negative electrode plate to be wound.

更にまた、本実施形態では、押しゴマ１４をリード板１７の中央部２３より上側に配置し、支持部材１９を中央部２３より下側に配置する例を示したが、本発明はこれに限定されるものではなく、押しゴマ１４と支持部材１９とが中央部２３に対して反対側に位置するようにすればよい。また、本実施形態では、突起部２２を支持部材１９と一体に形成する例を示したが、本発明はこれに限定されるものではなく、押しゴマ１４と一体に形成するようにしてもよい。この場合には、押しゴマ１４の支持部材１９側の端部に突起部２２を形成するようにすればよい。更に、突起部２２を支持部材１９または押しゴマ１４と一体に形成することに代えて、突起部２２に相当する別の離隔部材を配置するようにしてもよい。この場合には、離隔部材をモジュール３０の図示を省略したフレームに支持されるようにすればよい。また、本実施形態では、舌状の突起部２２を例示したが、リード板１７の中央部２３が破断したときに突起部２２が破断端部同士の間に介在することができればよく、形状等に制限されないことはもちろんである。   Furthermore, in this embodiment, the push sesame 14 is disposed above the central portion 23 of the lead plate 17 and the support member 19 is disposed below the central portion 23. However, the present invention is limited to this. Instead, the push sesame 14 and the support member 19 may be located on the opposite side with respect to the central portion 23. Moreover, although the example which forms the protrusion part 22 integrally with the supporting member 19 was shown in this embodiment, this invention is not limited to this, You may make it form integrally with the push sesame 14. . In this case, the protrusion 22 may be formed at the end of the push sesame 14 on the support member 19 side. Furthermore, instead of forming the protrusion 22 integrally with the support member 19 or the push sesame 14, another separation member corresponding to the protrusion 22 may be disposed. In this case, the separating member may be supported by a frame in which the module 30 is not shown. Further, in the present embodiment, the tongue-shaped protrusion 22 is illustrated, but it is sufficient that the protrusion 22 can be interposed between the broken ends when the central portion 23 of the lead plate 17 is broken, and the shape, etc. Of course, it is not limited to.

また、本実施形態では、リード板１７をアルミニウム合金製とする例を示したが、導電性を有する材質であれば特に制限されるものではない。モジュール全体の軽量化を考慮すれば、アルミニウム合金を使用することが好ましい。更に、リード板１７を板状とすることに代えて、例えば、両端部をそれぞれ負極外部端子１６側および単電池２１の負極端子側に曲げた形状としてもよい。また、本実施形態では、受圧板１３、押しゴマ１４、支持部材１９をそれぞれ円形状とする例を示したが、本発明はこれらの形状に制限されるものではなく、例えば、矩形状等としてもよい。   In this embodiment, the lead plate 17 is made of an aluminum alloy. However, the lead plate 17 is not particularly limited as long as it is a conductive material. Considering weight reduction of the entire module, it is preferable to use an aluminum alloy. Furthermore, instead of making the lead plate 17 into a plate shape, for example, both ends may be bent to the negative electrode external terminal 16 side and the negative electrode terminal side of the unit cell 21, respectively. In the present embodiment, the pressure receiving plate 13, the push sesame 14, and the support member 19 are each shown in a circular shape, but the present invention is not limited to these shapes. Also good.

更に、本実施形態では、単電池２０にリチウムイオン二次電池を例示したが、本発明はこれに限定されるものではなく、フィルムを外装体とした二次電池を用いるようにしてもよい。また、リチウムイオン二次電池に用いられる正負極活物質等の材料に制限のないことはもちろんである。更に、本実施形態では、単電池２０の外装体にＰＰフィルム−アルミニウム箔−ＰＥＴフィルムが重ね合わされたフィルムを例示したが、フィルムの構成に制限はなく、電池容器として使用可能な可撓性部材であればいかなる構成のフィルムでも使用することができる。また、本実施形態では、８個の単電池２０を直列接続する例を示したが、本発明は単電池の個数に制限されるものではなく、直列接続以外に直並列接続等の接続形態としてもよい。   Furthermore, in this embodiment, although the lithium ion secondary battery was illustrated as the single battery 20, this invention is not limited to this, You may make it use the secondary battery which used the film as the exterior body. Of course, there is no limitation on materials such as positive and negative electrode active materials used in the lithium ion secondary battery. Furthermore, in the present embodiment, the film in which the PP film-aluminum foil-PET film is superimposed on the outer package of the unit cell 20 is exemplified, but the configuration of the film is not limited, and the flexible member can be used as a battery container. Any film having any structure can be used. Further, in the present embodiment, an example in which eight unit cells 20 are connected in series has been shown, but the present invention is not limited to the number of unit cells, and as a connection form such as series-parallel connection other than series connection. Also good.

また、本実施形態では、複数個の単電池で構成した二次電池モジュールの例を示したが、本発明はこれに制限されるものではなく、二次電池モジュールが１個の単電池（単一電池）で構成されている場合にも適用可能である。この場合、例えば、複数個の単電池で構成した二次電池モジュールに、押しゴマを備えた１個の単電池を直列接続することで、上述したモジュール３０と同様の効果を得ることができる。このようにすれば、例えば、押しゴマに故障等のトラブルが生じたときに、１個の単電池を交換することができるので、低コスト化や交換作業の簡素化を図ることができる。   Further, in the present embodiment, an example of a secondary battery module configured by a plurality of single cells has been shown, but the present invention is not limited to this, and the secondary battery module includes one single battery (single cell). The present invention can also be applied to the case of a single battery. In this case, for example, the same effect as that of the module 30 described above can be obtained by connecting in series a single cell provided with push sesame to a secondary battery module constituted by a plurality of unit cells. In this way, for example, when a trouble such as a failure occurs in the push sesame, one unit cell can be replaced, so that the cost can be reduced and the replacement work can be simplified.

次に、本実施形態に従い製造したモジュール３０の実施例について説明する。なお、比較例として、押しゴマ１４の突起部２２を取り去る以外は実施例と同様にして、モジュールを製造した。   Next, an example of the module 30 manufactured according to the present embodiment will be described. As a comparative example, a module was manufactured in the same manner as in the example except that the protrusion 22 of the push sesame 14 was removed.

実施例および比較例のモジュール３０の１００台ずつについて、安定化電源を用いて５Ｖ、１ＣＡ（３．２Ａ）で過充電となるまで充電したときの発火の有無（安全性）を評価した。安全性の評価結果を下表１に示した。   The presence or absence (safety) of ignition was evaluated for each of the 100 modules 30 of the example and the comparative example using a stabilized power supply until charging was overcharged at 5 V, 1 CA (3.2 A). The safety evaluation results are shown in Table 1 below.

Figure 2008153204
Figure 2008153204

実施例および比較例のいずれのモジュールでも、通電開始からおよそ９０分後に単電池２０、２１が内部のガス発生によって膨張し、リード板１７の中央部２３が破断して電流が遮断された。その後には、支持部材１９の突起部２２を取り去った比較例のモジュールでは、１００台のうち１７台について、電流が遮断されてからおよそ１５〜３０分後にリード板１７が再び接触して電流が流れ始め、数分間通電しては電流が遮断される現象が数十回繰返された後、ついに発火に至った。これに対して、支持部材１９に突起部２２を有する実施例のモジュール３０では、何も起こらず１００台とも安全に停止した。このことから、突起部２２を有することで、押しゴマ１４による電流遮断後に再度電流が流れることなく安全にモジュール３０の機能を停止することができることが判明した。従って、モジュール３０は、従来のモジュールに比べて軽量でエネルギー密度が高いのみならず、内圧上昇時に確実に電流を遮断することができ、安全性の面においても極めて優れた性能を有することが確かめられ、工業的価値が極めて大きいことが明らかとなった。   In any of the modules of the example and the comparative example, the unit cells 20 and 21 expanded due to the generation of internal gas approximately 90 minutes after the start of energization, and the central portion 23 of the lead plate 17 was broken to interrupt the current. Thereafter, in the module of the comparative example in which the protruding portion 22 of the support member 19 is removed, about 17 units out of 100 units, the lead plate 17 comes into contact again about 15 to 30 minutes after the current is interrupted, and the current is generated. After flowing, the phenomenon that the current was cut off after several minutes of energization was repeated several tens of times, and finally fired. In contrast, in the module 30 of the example having the protrusion 22 on the support member 19, nothing occurred and all 100 units were safely stopped. From this, it has been found that the function of the module 30 can be safely stopped by having the protrusions 22 without the current flowing again after the current interruption by the push sesame 14. Therefore, it is confirmed that the module 30 is not only lighter and higher in energy density than the conventional module, but also can cut off the current reliably when the internal pressure rises, and has extremely excellent performance in terms of safety. It was revealed that the industrial value is extremely large.

本発明はフィルム型二次電池を使用し電池異常時の安全性を確保することができる二次電池モジュールを提供するため、二次電池モジュールの製造、販売に寄与するため、産業上の利用可能性を有する。   The present invention uses a film-type secondary battery to provide a secondary battery module that can ensure safety in the event of a battery abnormality, and contributes to the manufacture and sale of secondary battery modules, and thus can be used industrially. Have sex.

本発明に係る実施形態の二次電池モジュールを模式的に示す断面図である。It is sectional drawing which shows typically the secondary battery module of embodiment which concerns on this invention. 実施形態の二次電池モジュールに組み込んだリード板を示す平面図である。It is a top view which shows the lead plate integrated in the secondary battery module of embodiment. 実施形態の二次電池モジュールを構成するフィルム型二次電池の凸状フィルムを一部除いた平面図および側断面図である。It is the top view and side sectional view which removed a part of convex film of the film type secondary battery which comprises the secondary battery module of embodiment.

符号の説明Explanation of symbols

１、１’ ラミネートフィルム（可撓性部材）
１４ 押しゴマ
１６ 負極外部端子（外部出力端子）
１７ リード板（接続部材）
１８ 狭隘部（脆弱部の一部）
２０、２１ フィルム型リチウムイオン二次電池（単電池）
２３ 中央部（脆弱部）
３０ 二次電池モジュール 1, 1 'Laminate film (flexible member)
14 Push sesame 16 Negative external terminal (external output terminal)
17 Lead plate (connection member)
18 Narrow part (part of vulnerable part)
20, 21 Film type lithium ion secondary battery (single cell)
23 Central part (fragile part)
30 Secondary battery module

Claims (5)

可撓性部材を電池容器とした単一電池または積層状態で直列ないし直並列に接続され可撓性部材を電池容器とした複数個の単電池を有する二次電池モジュールにおいて、一部に脆弱部を有し前記単一電池または前記複数個の単電池のうち一側に配設された単電池に対峙するように配置された接続部材と、前記単一電池または前記一側に配設された単電池と前記接続部材との間に配置され前記接続部材に接触可能な押しゴマとを備え、前記接続部材は、前記脆弱部を挟んで一方の端部が前記単一電池または前記一側に配設された単電池に接続されており、かつ、他方の端部が外部出力端子に接続されており、前記単一電池または前記複数個の単電池のいずれかが膨張したときに、前記押しゴマにより前記脆弱部が破断することを特徴とする二次電池モジュール。   In a secondary battery module having a single battery using a flexible member as a battery container or a plurality of single cells connected in series or series-parallel in a stacked state and having a flexible member as a battery container, a weak part A connecting member disposed to face the single battery or the single battery disposed on one side of the plurality of single cells, and disposed on the single battery or the one side. A push block disposed between the unit cell and the connection member and capable of contacting the connection member, wherein the connection member has one end on the single cell or the one side across the weakened portion; And the other end is connected to an external output terminal, and when the single cell or the plurality of single cells expands, the push A secondary characterized in that the fragile portion is broken by sesame Pond module. 前記接続部材の前記押しゴマと反対側に配置され前記接続部材を支持する支持部材と、前記脆弱部が破断したときに該脆弱部の両方の破断端部を離隔する離隔部材とを更に備え、前記押しゴマと前記支持部材とが前記脆弱部に対して反対側に位置しており、前記離隔部材が前記支持部材または前記押しゴマの前記接続部材側で前記脆弱部に対応する位置に配置されていることを特徴とする請求項１に記載の二次電池モジュール。   A support member that is disposed on the opposite side of the connection member from the push sesame and supports the connection member; and a separation member that separates both broken ends of the fragile portion when the fragile portion is broken. The push sesame and the support member are located on the opposite side with respect to the fragile portion, and the separation member is disposed at a position corresponding to the fragile portion on the connection member side of the support member or the push sesame. The secondary battery module according to claim 1, wherein: 前記離隔部材は、前記押しゴマまたは前記支持部材と一体に形成されていることを特徴とする請求項２に記載の二次電池モジュール。   The secondary battery module according to claim 2, wherein the separation member is formed integrally with the push sesame or the support member. 前記単一電池または前記一側に配設された単電池に剛性を有する樹脂板が固着されていることを特徴とする請求項１または請求項２に記載の二次電池モジュール。   The secondary battery module according to claim 1 or 2, wherein a resin plate having rigidity is fixed to the single battery or the single battery disposed on the one side. 前記一側に配設された単電池の電池容量は、前記複数個の単電池のうち前記一側に配設された単電池以外の単電池の電池容量より小さいことを特徴とする請求項１乃至請求項４のいずれか１項に記載の二次電池モジュール。   2. The battery capacity of the unit cell disposed on the one side is smaller than the unit cell capacity of the plurality of unit cells other than the unit cell disposed on the one side. The secondary battery module of any one of thru | or 4 thru | or 4.
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