JP5485724B2 - Square battery - Google Patents

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JP5485724B2
JP5485724B2 JP2010013854A JP2010013854A JP5485724B2 JP 5485724 B2 JP5485724 B2 JP 5485724B2 JP 2010013854 A JP2010013854 A JP 2010013854A JP 2010013854 A JP2010013854 A JP 2010013854A JP 5485724 B2 JP5485724 B2 JP 5485724B2
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battery
frame
lid member
lid
shaped member
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JP2011154791A (en
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高広 森本
一良 高垣
昌輝 名小路
光 羽生
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Kawasaki Motors 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

Description

本発明は、密閉式の角形電池、特に、複数接続されて電池モジュールとして使用される角形電池に関する。   The present invention relates to a sealed prismatic battery, and more particularly to a prismatic battery that is used as a battery module by being connected in plural.

従来、密閉式電池の形状として、円筒形が一般的に採用されてきた。円筒形電池においては、電極体として、正極体と負極体とをセパレータを介して円筒形に巻き取った簡易な構造のものを使用することができると同時に、電池の内部圧力に対する耐圧性に優れるという利点がある。   Conventionally, a cylindrical shape has generally been adopted as the shape of a sealed battery. In a cylindrical battery, a simple structure in which a positive electrode body and a negative electrode body are wound into a cylindrical shape via a separator can be used as an electrode body, and at the same time, the pressure resistance against the internal pressure of the battery is excellent. There is an advantage.

ところで、近年、省エネルギーやＣＯ２削減への配慮から、自動車や電車などの車両に搭載する、充放電可能な二次電池が開発されている。車両に二次電池を搭載した場合には、ブレーキ時の回生電力をこの搭載電池に蓄えておき、車両の動力源として使用することができるので、車両運行のエネルギー効率を高め、ＣＯ２の排出量を削減することができる。 Recently, in consideration of energy saving and CO 2 reduction, a chargeable / dischargeable secondary battery mounted on a vehicle such as an automobile or a train has been developed. When a secondary battery is mounted on a vehicle, the regenerative power during braking can be stored in this mounted battery and used as a power source for the vehicle, increasing the energy efficiency of vehicle operation and reducing CO 2 emissions. The amount can be reduced.

車両用の電池には、設置スペースが制限される都合上、従来の携帯機器等に用いられるものに比べて、高電圧および高エネルギー容量が要求されるため、大型の電池を複数組み合わせて構成した電池モジュールを使用することが一般的である。大型電池を使用する場合には、電池性能や生産性の観点から、円筒形電池に用いられる巻取り式の電極体よりも、正極体と負極体を交互に積層した電極体の方が適していること、および、電池が設置されるスペースを効率的に利用する必要性が大きいことから、円筒形よりも角形の電池とすることが望ましい（特許文献１）。   Due to the limited installation space, vehicle batteries require a higher voltage and higher energy capacity than those used in conventional portable devices. It is common to use a battery module. When using a large battery, from the viewpoint of battery performance and productivity, an electrode body in which positive and negative electrode bodies are alternately laminated is more suitable than a wound electrode body used in a cylindrical battery. Therefore, it is desirable to use a square battery rather than a cylindrical battery (Patent Document 1).

このように、複数の角形電池を組み合わせて電池モジュールとして用いるための単位電池の構造として、例えば、対向配置された正・負極それぞれの端子板を兼ねる２つの蓋状の部材間に、絶縁素材からなる矩形の枠形部材を介在させて電池のケーシングを形成し、このケーシング内に、プリーツ状のセパレータを介して交互に積層された正極体および負極体からなる電極体を収納するものが提案されている（特許文献２）。このような構造を有する角形電池において、隣接する電池の一方の正極端子板と他方の負極端子板とが互いに接触するように複数の電池を互いに押し付けて積層させることにより、電池の密閉性を確保している。   Thus, as a structure of a unit battery for combining a plurality of prismatic batteries to be used as a battery module, for example, an insulating material is used between two lid-shaped members that serve as terminal plates for both positive and negative electrodes arranged opposite to each other. A battery casing is formed by interposing a rectangular frame-shaped member, and an electrode body composed of a positive electrode body and a negative electrode body alternately stacked via a pleated separator is accommodated in the casing. (Patent Document 2). In a rectangular battery having such a structure, a plurality of batteries are pressed against each other and stacked such that one positive electrode terminal plate and the other negative electrode terminal plate of adjacent batteries are in contact with each other, thereby ensuring battery hermeticity. doing.

特開２００１−１１０３８１号公報JP 2001-110381 A 国際公開第２００９／１２５５４４号International Publication No. 2009/125544

多数の電池を接続して構成した電池モジュールでは、充放電を繰り返すうちに、電池間で電池性能の劣化度合いに差が生じることがある。性能劣化の大きい電池が発生すると、その影響を受けて電池モジュール全体の充放電性能が低下するが、このような場合でも、性能劣化の大きい電池のみを新しい電池に交換することにより、電池モジュール全体の充放電性能を維持することが可能になる。   In a battery module configured by connecting a large number of batteries, a difference in the degree of deterioration in battery performance may occur between the batteries while charging and discharging are repeated. When a battery with significant performance degradation occurs, the charge / discharge performance of the entire battery module is affected by that effect. Even in such a case, the entire battery module can be replaced by replacing only the battery with significant performance degradation with a new battery. It becomes possible to maintain the charge / discharge performance.

しかしながら、上記電池の密閉は、主として、複数個の電池を積層した電池モジュール全体を積層方向に締め付けるための、板状部材や固定用部材によって確保されている。したがって、劣化した電池を交換するために電池モジュールを解体すると、交換する必要のない電池において、密閉性が維持されず、電解液漏れが発生する場合がある。電池交換時の電解液漏れを防止するためには、電池モジュールの解体前に電解液を抜き取り、組立て後に再注入する必要があるので、電池交換作業の負担が大きく、電池モジュールを長期にわたって使用することが困難であるという課題があった。   However, the sealing of the battery is ensured mainly by a plate-like member or a fixing member for fastening the entire battery module in which a plurality of batteries are stacked in the stacking direction. Therefore, when a battery module is disassembled to replace a deteriorated battery, sealing performance may not be maintained in a battery that does not need to be replaced, and electrolyte leakage may occur. In order to prevent electrolyte leakage during battery replacement, it is necessary to extract the electrolyte before disassembling the battery module and reinject it after assembly, which places a heavy burden on the battery replacement and uses the battery module for a long time. There was a problem that it was difficult.

本発明の目的は、上記の課題を解決するために、電池モジュールの組立てを容易にする構造を維持しながら電池単独での密閉性を確保して、電池モジュールにおける電池交換を容易とすることにより、電池の交換を行いながら長期に渡って電池モジュールの充放電性能維持が可能となる角形電池を提供することにある。   In order to solve the above problems, the object of the present invention is to maintain the structure that facilitates the assembly of the battery module while ensuring the sealing performance of the battery alone, thereby facilitating battery replacement in the battery module. An object of the present invention is to provide a prismatic battery that can maintain the charge / discharge performance of the battery module over a long period of time while replacing the battery.

前記した目的を達成するために、本発明に係る角形電池は、矩形の枠形部材と、この枠形部材の両開口部を覆う平板状の第１蓋部材および第２蓋部材とを有するケーシングを備える角形電池であって、前記第１蓋部材および第２蓋部材が、それぞれ、平板状の本体部と、この本体部の縁部から両蓋部材の対向方向に突設された側壁部とを有し、前記側壁部に、内側に突出する係合凸部が設けられ、前記枠形部材の外側面に、前記係合凸部に係合して、前記各蓋部材の本体部を前記枠形部材に向かって引き寄せる係合凹部が形成されている。   In order to achieve the above-described object, a rectangular battery according to the present invention includes a rectangular frame-shaped member, and a casing having a flat plate-like first lid member and a second lid member that cover both openings of the frame-shaped member. Each of the first lid member and the second lid member has a flat plate-like main body portion, and a side wall portion projecting from the edge portion of the main body portion in the opposing direction of the two lid members. The side wall portion is provided with an engaging convex portion protruding inward, and the outer surface of the frame-shaped member is engaged with the engaging convex portion so that the main body portion of each lid member is An engaging recess that is drawn toward the frame-shaped member is formed.

この構成によれば、係合凸部と係合凹部との係合により各蓋部材の本体部が枠形部材に向かって引き寄せられることで、電池単体でケーシングの密閉性が確保される。したがって、この電池を複数積層して構成した電池モジュールを解体した場合にも、電池からの電解液漏れが防止されるので、電池モジュールの電池交換を容易に行うことができる。これにより、電池モジュールの充放電性能を、電池の交換を行いながら長期に渡って維持することが可能となる。   According to this structure, the main body part of each lid member is drawn toward the frame-shaped member by the engagement between the engagement convex part and the engagement concave part, so that the sealing property of the casing is secured by the battery alone. Therefore, even when the battery module configured by stacking a plurality of the batteries is disassembled, leakage of the electrolytic solution from the battery is prevented, so that the battery replacement of the battery module can be easily performed. Thereby, the charge / discharge performance of the battery module can be maintained over a long period of time while replacing the battery.

本発明に係る角形電池においては、前記第１蓋部材および第２蓋部材が、それぞれ、前記枠形部材の４つの側面に沿って延びる４つの前記側壁部を有しており、各側壁部に少なくとも１つの前記係合凸部が設けられており、前記枠形部材の各側面に、前記各係合凸部に対応する係合凹部が設けられている。この構成によれば、ケーシングの４側面のそれぞれに少なくとも一対の係合凸部・係合凹部を設けることにより、より確実に電池の密閉性が維持される。   In the rectangular battery according to the present invention, each of the first lid member and the second lid member has four side wall portions extending along four side surfaces of the frame-shaped member, and each side wall portion has At least one engagement convex portion is provided, and an engagement concave portion corresponding to each engagement convex portion is provided on each side surface of the frame-shaped member. According to this configuration, by providing at least a pair of engaging convex portions / engaging concave portions on each of the four side surfaces of the casing, the sealing performance of the battery is more reliably maintained.

本発明に係る角形電池において、前記枠形部材と前記第１蓋部材の本体部との間、および、前記枠形部材と前記第２蓋部材の本体部との間に、それぞれ、前記対向方向に弾性を有するシール部材が介在していることが好ましい。この構成によれば、係合凸部および係合凹部が設けられる位置に製造上のばらつきが発生した場合にも、シール部材によって一層確実に電池の密閉性が維持される。   In the prismatic battery according to the present invention, the opposing direction is between the frame-shaped member and the main body portion of the first lid member, and between the frame-shaped member and the main body portion of the second lid member, respectively. It is preferable that an elastic seal member is interposed between the two. According to this configuration, even when manufacturing variations occur at the positions where the engaging convex portions and the engaging concave portions are provided, the sealing performance of the battery is more reliably maintained by the sealing member.

本発明に係る角形電池において、前記枠形部材に、前記シール部材を受け入れるシール溝が設けられていることが好ましい。この構成によれば、シール部材の位置ずれや脱落が効果的に防止されるので、長期に渡って確実に電池の密閉性が維持される。   In the prismatic battery according to the present invention, it is preferable that the frame-shaped member is provided with a seal groove for receiving the seal member. According to this configuration, the seal member is effectively prevented from being displaced or dropped out, so that the battery is reliably sealed over a long period of time.

本発明に係る角形電池において、前記シール溝の深さ寸法が、前記シール部材の高さ寸法に対して５０％〜９０％の範囲内に設定されている。ここで、シール部材の高さ寸法とは、シール溝内に配置され、かつ、収縮していない状態におけるシール部材の、シール溝の深さと同一方向の寸法を意味する。シール溝の深さ寸法の、シール部材の高さ寸法に対する割合が大き過ぎると、シール部材のシール性能が適切に発揮されず、一方、小さ過ぎると、シール部材が過度に収縮した状態が長期間維持される可能性があり、その場合、弾性力つまりシール性能が劣化する。しかしながら、シール溝の深さ寸法の、シール部材の高さ寸法に対する割合を上記の範囲に設定することにより、長期に渡って十分なシール性能が維持される。   In the rectangular battery according to the present invention, a depth dimension of the seal groove is set in a range of 50% to 90% with respect to a height dimension of the seal member. Here, the height dimension of the seal member means a dimension in the same direction as the depth of the seal groove of the seal member that is disposed in the seal groove and not contracted. If the ratio of the depth dimension of the seal groove to the height dimension of the seal member is too large, the seal performance of the seal member will not be adequately exhibited. On the other hand, if the ratio is too small, the seal member will be excessively contracted for a long time. In such a case, the elastic force, that is, the sealing performance is deteriorated. However, by setting the ratio of the depth dimension of the seal groove to the height dimension of the seal member within the above range, sufficient sealing performance can be maintained over a long period of time.

本発明に係る角形電池において、前記第１蓋部材が正極集電板を兼ねており、前記第２蓋部材が負極集電板を兼ねており、前記第１蓋部材および第２蓋部材の間に、これら蓋部材の対向方向と直交する方向にセパレータを介して交互に積層された、複数の平板状の正極体および負極体が収容されており、前記第１蓋部材と前記正極体の間、および前記第２蓋部材と前記負極体の間に、それぞれ、前記対向方向に弾性を有するシート状の導電性の緩衝部材が介在していてもよい。電池モジュールの解体時に、上記の構造によって電池からの電解液漏れは防止できても、ケーシングを両蓋部材の対向方向に締め付ける圧力が開放されることにより、正極体および負極体と、各集電板との接触圧が弱くなり、再度電池モジュールを組んでも元の接触圧まで復帰しない場合がある。つまり、電池を交換するために電池モジュールを組みなおすことにより、各電池の内部抵抗が上昇し、電池モジュールの充放電性能が低下する場合がある。しかしながら、正極体・負極体と各蓋部材との間に、弾性を有する緩衝部材を介在させることにより、これらの間の接触圧の低下、つまり電池の内部抵抗の上昇を抑制することができるので、電池モジュールの充放電性能を、電池の交換を行いながら長期に渡って維持することが可能となる。   In the prismatic battery according to the present invention, the first lid member also serves as a positive electrode current collector plate, the second lid member also serves as a negative electrode current collector plate, and the space between the first lid member and the second lid member. A plurality of plate-like positive electrode bodies and negative electrode bodies, which are alternately stacked via separators in a direction perpendicular to the facing direction of the lid members, are accommodated between the first lid member and the positive electrode bodies. In addition, a sheet-like conductive buffer member having elasticity in the facing direction may be interposed between the second lid member and the negative electrode body. When the battery module is disassembled, even though electrolyte leakage from the battery can be prevented by the above-described structure, the positive electrode body and the negative electrode body, and the respective current collectors are released by releasing the pressure for tightening the casing in the opposite direction of the both lid members. The contact pressure with the plate becomes weak, and even if the battery module is assembled again, the original contact pressure may not be restored. That is, by reassembling the battery module to replace the battery, the internal resistance of each battery may increase, and the charge / discharge performance of the battery module may decrease. However, by interposing an elastic buffer member between the positive electrode body / negative electrode body and each lid member, a decrease in contact pressure between them, that is, an increase in the internal resistance of the battery can be suppressed. The charge / discharge performance of the battery module can be maintained over a long period of time while replacing the battery.

本発明に係る角形電池において、前記緩衝部材は、例えば、前記対向方向と直交する方向に並んだ多数の突起を有する金属板を含む。この構成によれば、簡単な構造できわめて効果的に正極体・負極体と各蓋部材との間の接触圧を維持することができる。   In the prismatic battery according to the present invention, the buffer member includes, for example, a metal plate having a large number of protrusions arranged in a direction orthogonal to the facing direction. According to this configuration, the contact pressure between the positive electrode body / negative electrode body and each lid member can be maintained very effectively with a simple structure.

以上のように、本発明に係る角形電池によれば、電池モジュールの組立てを容易にする構造を有しながら、電池単独で密閉性が確保され、電池モジュールにおける電池交換が容易となる。これにより、この電池が使用される電池モジュールの充放電性能を、電池の交換を行いながら長期に渡って維持することが可能となる。   As described above, according to the prismatic battery according to the present invention, while having a structure that facilitates assembly of the battery module, hermeticity is secured by the battery alone, and battery replacement in the battery module is facilitated. This makes it possible to maintain the charge / discharge performance of the battery module in which the battery is used over a long period of time while replacing the battery.

本発明の第１実施形態に係る角形電池が使用される電池モジュールを示す概略構成図である。It is a schematic block diagram which shows the battery module in which the square battery which concerns on 1st Embodiment of this invention is used. 本発明の第１実施形態に係る角形電池を示す部分破断断面図である。It is a fragmentary sectional view which shows the square battery which concerns on 1st Embodiment of this invention. 図２の角形電池の要部を示す図であり、（ａ）が平面図、（ｂ）が断面図である。It is a figure which shows the principal part of the square battery of FIG. 2, (a) is a top view, (b) is sectional drawing. 図２の角形電池の要部の他の例を示す図であり、（ａ）が平面図、（ｂ）が断面図である。It is a figure which shows the other example of the principal part of the square battery of FIG. 2, (a) is a top view, (b) is sectional drawing. 図２の角形電池の係合凸部および係合凹部の他の例を示す図であり、（ａ）が平面図、（ｂ）が断面図である。It is a figure which shows the other example of the engagement convex part and engagement concave part of the square battery of FIG. 2, (a) is a top view, (b) is sectional drawing. 図２の角形電池に使用される枠形部材を示す平面図である。It is a top view which shows the frame-shaped member used for the square battery of FIG. 図２の角形電池に使用されるシール部材とシール溝の寸法を模式的に示す断面図である。It is sectional drawing which shows typically the dimension of the sealing member used for the square battery of FIG. 2, and a seal groove. 図２の角形電池に使用されるシール部材の他の例を示す断面図である。It is sectional drawing which shows the other example of the sealing member used for the square battery of FIG. 図２の角形電池の変形例を示す断面図である。It is sectional drawing which shows the modification of the square battery of FIG. 本発明の第２実施形態に係る角形電池を示す断面図である。It is sectional drawing which shows the square battery which concerns on 2nd Embodiment of this invention. 図１０の角形電池に使用されるシート状緩衝部材の例を模式的に示す断面図である。It is sectional drawing which shows typically the example of the sheet-like buffer member used for the square battery of FIG.

以下、本発明に係る実施形態を図面に従って説明するが、本発明はこの実施形態に限定されるものではない。   Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.

図１は、本発明の第１実施形態に係る角形電池（以下、単に「電池」と呼ぶ。）が適用される電池モジュールを示す概略構成図である。この電池モジュールＢは、例えば、電車に搭載されるものであって、電池Ｃを、電池Ｃの厚み方向に複数個（本実施形態では３０個）積層して構成したものであり、これらが絶縁材料からなるハウジングＨによって覆われている。なお、本実施形態における電池Ｃは、水酸化ニッケルを主要な正極活物質とし、水素吸蔵合金を主要な負極活物質とし、アルカリ系水溶液を電解液とする、繰り返し充放電が可能なニッケル水素二次電池として構成されている。   FIG. 1 is a schematic configuration diagram showing a battery module to which a prismatic battery (hereinafter simply referred to as “battery”) according to a first embodiment of the present invention is applied. The battery module B is mounted on a train, for example, and is formed by stacking a plurality of batteries C (30 in the present embodiment) in the thickness direction of the battery C, and these are insulated. It is covered by a housing H made of material. Note that the battery C in this embodiment is a nickel-hydrogen secondary battery that can be repeatedly charged and discharged using nickel hydroxide as a main positive electrode active material, a hydrogen storage alloy as a main negative electrode active material, and an alkaline aqueous solution as an electrolyte. It is configured as a secondary battery.

図２は、図１の電池Ｃの構造の一例を示す部分破断断面図である。電池Ｃは、セパレータ１１、正極体１３および負極体１５を含む電極体１７と、電極体１７を電解液とともに収容する角形形状のケーシング１９とを備えている。ケーシング１９は、絶縁素材からなる矩形の枠形部材２１と、枠形部材２１の二つの開口部２１ａ，２１ａをそれぞれ覆う、平板状の第１蓋部材２３および第２蓋部材２５とから構成されている。つまり、ケーシング１９において、両蓋部材２３，２５は、枠形部材２１を介して互いに対向している。   FIG. 2 is a partially broken cross-sectional view showing an example of the structure of battery C in FIG. The battery C includes an electrode body 17 including a separator 11, a positive electrode body 13, and a negative electrode body 15, and a rectangular casing 19 that houses the electrode body 17 together with an electrolytic solution. The casing 19 includes a rectangular frame member 21 made of an insulating material, and a flat plate-like first lid member 23 and a second lid member 25 that respectively cover the two openings 21 a and 21 a of the frame member 21. ing. That is, in the casing 19, the lid members 23 and 25 face each other with the frame-shaped member 21 interposed therebetween.

なお、枠形部材２１を形成する絶縁素材として、本実施形態では変性ポリフェニレンエーテル（ＰＰＥ）樹脂を用いているが、機械的強度、耐熱性および耐電解液性の観点から種々の材料を選択できる。また、両蓋部材２３，２５を形成する素材として、導電素材であるニッケルめっきを施した鋼板を用いているが、電気化学的な特性や機械的強度、耐食性などを考慮して、適宜選択することができる。   In this embodiment, a modified polyphenylene ether (PPE) resin is used as an insulating material for forming the frame-shaped member 21, but various materials can be selected from the viewpoint of mechanical strength, heat resistance, and electrolytic solution resistance. . Moreover, although the steel plate which gave the nickel plating which is a conductive material is used as a material which forms both the cover members 23 and 25, it considers an electrochemical characteristic, mechanical strength, corrosion resistance, etc., and selects it suitably. be able to.

電極体１７の構造は、例えば、複数の正極体１３と複数の負極体１５とが、プリーツ状に折り曲げられたセパレータ１１を介して所定の方向（本実施形態では両蓋部材２３，２５の対向方向Ｘに直交する方向Ｙ）に交互に積層されて対向する積層構造を有している。ケーシング１９の第１蓋部材２３および第２蓋部材２５は、導電性材料、例えばニッケルめっきを施した鋼板で形成されており、正極体１３は第１蓋部材２３に、負極体１５は第２蓋部材２５に、それぞれ電気的に接続されている。つまり、第１および第２蓋部材２３，２５は、それぞれ、電池Ｃの正極集電板および負極集電板を兼ねている。なお、セパレータ１１は、図２に示したプリーツ状のものに限らず、例えば、袋状のものを使用してもよい。   The structure of the electrode body 17 is such that, for example, a plurality of positive electrode bodies 13 and a plurality of negative electrode bodies 15 are opposed to each other in a predetermined direction (in this embodiment, both lid members 23 and 25 are opposed to each other through a pleated separator 11. It has a laminated structure that is alternately laminated in the direction Y) orthogonal to the direction X and faces each other. The first lid member 23 and the second lid member 25 of the casing 19 are formed of a conductive material, for example, a steel plate subjected to nickel plating. The positive electrode body 13 is the first lid member 23 and the negative electrode body 15 is the second. The lid member 25 is electrically connected to each other. That is, the first and second lid members 23 and 25 also serve as the positive electrode current collector plate and the negative electrode current collector plate of the battery C, respectively. The separator 11 is not limited to the pleated one shown in FIG. 2, and for example, a bag-like one may be used.

次に、本実施形態に係る電池Ｃのケーシング１９の構造について詳細に説明する。なお、以下の説明においては、代表として正極側の第１蓋部材２３側についてのみ説明する場合があるが、負極側である第２蓋部材２５側も第１蓋部材２３側と同様の構造を有している。   Next, the structure of the casing 19 of the battery C according to this embodiment will be described in detail. In the following description, only the first lid member 23 side on the positive electrode side may be described as a representative, but the second lid member 25 side on the negative electrode side also has the same structure as the first lid member 23 side. Have.

図２に示すように、ケーシング１９の第１蓋部材２３は、平板状の本体部２３ａと、本体部２３ａの縁部から対向方向Ｘに突設された側壁部２３ｂとを有している。第１蓋部材２３の側壁部２３ｂには、ケーシング１９の内側方向に突出する係合凸部３１が設けられている。具体的には、図３（ａ）に示すように、側壁部２３ｂにおいて、側壁部２３ｂの長手方向に平行な１辺３１ａと、この１辺３１ａの両端から、側壁部２３ｂの側端部に向かって延びる、つまり、本体部２３ａから離れる方向に斜めに延びる２つの斜辺３１ｂ、３１ｂとを切り込んで形成されたほぼ台形状の切片を、図３（ｂ）に示すように、プレスによって、底辺３１ｃに沿って内側に曲げて起こすことにより、係合凸部３１が形成される。   As shown in FIG. 2, the first lid member 23 of the casing 19 has a flat plate-like main body 23 a and a side wall 23 b that protrudes in the facing direction X from the edge of the main body 23 a. On the side wall 23 b of the first lid member 23, an engagement convex portion 31 that protrudes in the inner direction of the casing 19 is provided. Specifically, as shown in FIG. 3A, in the side wall portion 23b, one side 31a parallel to the longitudinal direction of the side wall portion 23b and from both ends of the one side 31a to the side end portion of the side wall portion 23b. A substantially trapezoidal section formed by cutting two oblique sides 31b and 31b extending obliquely in a direction away from the main body 23a is pressed by a press as shown in FIG. The engagement convex part 31 is formed by bending inward along 31c and raising.

一方、枠形部材２１の外側面２１ｂの、前記係合凸部３１に対応する位置には、平面視（図３（ａ））で方形に形成された係合凹部３３が設けられている。図３（ｂ）に示すように、係合凸部３１の先端部を、枠形部材２１の係合凹部３３の上側（第１蓋部材２３の本体部２３ａ側）の内壁面３３ａに当接させることにより、係合凸部３１を係合凹部３３に係合させている。このとき、第１蓋部材２３を枠形部材２１に被せて対向方向Ｘに強く押し付けることにより、側壁部２３ｂ外側へ弾性変形させて、枠形部材２１の外側面２１ｂ上を滑らせ、係合凸部３１を強制的に係合凹部３３に進入させ、第１蓋部材２３の弾性復帰力により係合凸部３１を係合凹部３３の内壁面３３ａに圧接する。この係合凸部３１の係合凹部３３との係合力により、第１蓋部材２３の本体部２３ａが、枠形部材２１の開口部２１ａを形成する端部（端面）２１ｃに圧接する方向に引き寄せられる。   On the other hand, an engagement recess 33 formed in a square shape in a plan view (FIG. 3A) is provided on the outer surface 21 b of the frame-shaped member 21 at a position corresponding to the engagement protrusion 31. As shown in FIG. 3 (b), the front end portion of the engaging convex portion 31 abuts on the inner wall surface 33 a on the upper side of the engaging concave portion 33 of the frame-shaped member 21 (the main body portion 23 a side of the first lid member 23). By doing so, the engaging convex part 31 is engaged with the engaging concave part 33. At this time, the first lid member 23 is put on the frame-shaped member 21 and strongly pressed in the facing direction X, thereby elastically deforming to the outside of the side wall portion 23b, and sliding on the outer surface 21b of the frame-shaped member 21 for engagement. The protrusion 31 is forced to enter the engagement recess 33, and the engagement protrusion 31 is pressed against the inner wall surface 33 a of the engagement recess 33 by the elastic return force of the first lid member 23. Due to the engaging force of the engaging convex portion 31 with the engaging concave portion 33, the main body portion 23 a of the first lid member 23 is in a direction in which it is pressed against the end portion (end surface) 21 c that forms the opening 21 a of the frame-shaped member 21. Gravitate.

上記のように、係合凸部３１を、ほぼ台形形状の切片を切り起こして形成することにより、両蓋部材２３，２５の型の作製が容易になる。さらに、両蓋部材２３，２５を枠形部材２１に嵌め込むときに、いったん切り起こされた係合凸部３１が、枠形部材２１の外側面２１ｂに沿って容易に外側に戻され、その後、係合凹部３３の位置に達したときに切り起こされた状態に復帰して係合凹部３３に係合するので、ケーシング１９の組み立てが容易である。   As described above, by forming the engagement convex portion 31 by cutting and raising a substantially trapezoidal section, the molds of the lid members 23 and 25 can be easily manufactured. Further, when the lid members 23 and 25 are fitted into the frame-shaped member 21, the engagement convex portion 31 once cut and raised is easily returned to the outside along the outer surface 21 b of the frame-shaped member 21. When the position of the engagement recess 33 is reached, the state of being cut and raised is restored and engaged with the engagement recess 33, so that the casing 19 can be easily assembled.

もっとも、係合凸部３１の形状は上記のものに限られない。例えば、図４（ａ）に示すように、側壁部２３ｂにおいて、長手方向に平行に切り込まれた一辺３１ａの、側壁部２３ｂの側端部側に位置する部分を、図４（ｂ）に示すように、プレスによって内側に起こすことにより係合凸部３１を形成してもよい。あるいは、図５（ａ），（ｂ）に示すように、側壁部２３ｂの壁面上で方形をなす係合凸部３１をプレス成形によって形成してもよい。   But the shape of the engagement convex part 31 is not restricted to said thing. For example, as shown in FIG. 4A, in the side wall 23b, a portion of the side 31a cut in parallel to the longitudinal direction and located on the side end side of the side wall 23b is shown in FIG. As shown, the engaging protrusion 31 may be formed by raising it inward by a press. Alternatively, as shown in FIGS. 5 (a) and 5 (b), the engagement convex portion 31 having a square shape on the wall surface of the side wall portion 23b may be formed by press molding.

なお、図３〜５に示した例では、第１蓋部材２３および第２蓋部材２５の各側壁部２３ｂ，２５ｂにそれぞれ１つの係合凸部３１が設けられており、枠形部材２１の各外側面２１ｂに、各係合凸部３１に対応する係合凹部３３が設けられている。係合凸部３１および係合凹部３３の数および位置は、この例に限らず、適宜設定してよいが、両蓋部材２３，２５と枠形部材２１との密閉性をより確実に維持するためには、各側壁部２３ｂ，２５ｂに対して少なくとも１対の係合凸部３１、係合凹部３３を設けることが望ましい。   In the example shown in FIGS. 3 to 5, one engaging convex portion 31 is provided on each of the side wall portions 23 b and 25 b of the first lid member 23 and the second lid member 25. Engagement recesses 33 corresponding to the respective engagement protrusions 31 are provided on each outer surface 21b. The numbers and positions of the engaging protrusions 31 and the engaging recesses 33 are not limited to this example, and may be set as appropriate. However, the sealing performance between the lid members 23 and 25 and the frame member 21 is more reliably maintained. For this purpose, it is desirable to provide at least a pair of engaging convex portions 31 and engaging concave portions 33 for each of the side wall portions 23b and 25b.

さらに、係合凸部３１の、係合凹部３３に係合する部分を、係合凹部３３の内壁面３３ａの形状に沿った平坦な面として形成することが好ましい。これにより、係合凸部３１が係合凹部３３に当接する圧力が分散され、長期に渡って係合凸部３１および係合凹部３３が変形することなく、ケーシング１９の密閉性が確保される。   Furthermore, it is preferable to form a portion of the engaging convex portion 31 that engages with the engaging concave portion 33 as a flat surface that follows the shape of the inner wall surface 33 a of the engaging concave portion 33. As a result, the pressure at which the engaging convex portion 31 abuts on the engaging concave portion 33 is dispersed, and the sealing performance of the casing 19 is ensured without the engaging convex portion 31 and the engaging concave portion 33 being deformed over a long period of time. .

また、図３に示すように、第１蓋部材２３と枠形部材２１との間には、シール部材３５としてＯリングが介在している。具体的には、図６に示すように、枠形部材２１の開口部２１ａを形成する端部２１ｃの全周に渡って、シール部材３５を受けるためのシール溝３７が設けられており、このシール溝３７に沿って図３のシール部材３５が配置されている。   As shown in FIG. 3, an O-ring is interposed as a seal member 35 between the first lid member 23 and the frame-shaped member 21. Specifically, as shown in FIG. 6, a seal groove 37 for receiving the seal member 35 is provided over the entire circumference of the end 21 c forming the opening 21 a of the frame-shaped member 21. A seal member 35 of FIG. 3 is disposed along the seal groove 37.

このように、両蓋部材２３，２５と枠形部材２１との間に、それぞれ、シール部材３５を介在させることにより、係合凸部３１および係合凹部３３が設けられる各位置に製造上のばらつきが発生した場合にも、両蓋部材２３，２５と枠形部材２１との間が確実にシールされ、電池Ｃの密閉性が確保される。また、シール溝３７は省略してもよいが、シール溝３７を設けることにより、シール部材３５の位置ずれや脱落が防止され、長期に渡って確実に電池Ｃの密閉性が維持される。   As described above, the sealing member 35 is interposed between the lid members 23 and 25 and the frame-shaped member 21, so that each of the positions where the engaging convex portion 31 and the engaging concave portion 33 are provided is manufactured. Even when the variation occurs, the space between the lid members 23 and 25 and the frame-shaped member 21 is reliably sealed, and the sealing performance of the battery C is ensured. In addition, the seal groove 37 may be omitted, but by providing the seal groove 37, the position shift and dropout of the seal member 35 are prevented, and the sealing performance of the battery C is reliably maintained over a long period of time.

なお、図７に示すシール溝３７の深さ寸法Ｄｇは、シール部材３５の高さ寸法Ｈｓに対して５０〜９０％の範囲内にあることが好ましく、６０〜８０％の範囲内にあることがより好ましい。ここで、シール部材３５の高さＨｓとは、シール溝３７内に配置され、かつ、収縮していない状態におけるシール部材３５の、シール溝３７の深さと同一方向の寸法を意味する。シール溝３７の深さ寸法Ｄｇの、シール部材３５の高さ寸法Ｈｓに対する割合が大き過ぎると、シール部材３５のシール性能が適切に発揮されず、一方、小さ過ぎると、シール部材３５が過度に収縮した状態が長期間維持される可能性があり、その場合弾性力つまりシール性能が劣化する。しかしながら、シール溝３７の深さ寸法Ｄｇの、シール部材３５の高さ寸法Ｈｓに対する割合を上記の範囲に設定することにより、長期に渡って十分なシール性能が維持される。   The depth dimension Dg of the seal groove 37 shown in FIG. 7 is preferably in the range of 50 to 90% with respect to the height dimension Hs of the seal member 35, and is in the range of 60 to 80%. Is more preferable. Here, the height Hs of the seal member 35 means a dimension in the same direction as the depth of the seal groove 37 of the seal member 35 that is disposed in the seal groove 37 and is not contracted. When the ratio of the depth dimension Dg of the seal groove 37 to the height dimension Hs of the seal member 35 is too large, the sealing performance of the seal member 35 is not properly exhibited. There is a possibility that the contracted state is maintained for a long period of time, in which case the elastic force, that is, the sealing performance deteriorates. However, by setting the ratio of the depth dimension Dg of the seal groove 37 to the height dimension Hs of the seal member 35 within the above range, sufficient sealing performance can be maintained over a long period of time.

シール部材３５としては、Ｏリングに限らず、例えば、図８（ａ）に示す平パッキンや図８（ｂ）に示す甲型パッキンなど、対向方向Ｘに弾性を有するものであれば、任意の種類のものを使用することができる。また、シール部材３５を形成する材質は、弾性のほかに、耐電解液性、つまり本実施形態においては耐アルカリ性を考慮して適宜選択することができ、例えば、エチレン−プロピレン−ジエンゴム（ＥＰＤＭ）を使用することができる。   The seal member 35 is not limited to the O-ring, and any seal member 35 may be used as long as it has elasticity in the facing direction X, such as a flat packing shown in FIG. 8A and an upper packing shown in FIG. Different types can be used. Further, the material forming the seal member 35 can be appropriately selected in consideration of the electrolyte resistance in addition to elasticity, that is, alkali resistance in the present embodiment. For example, ethylene-propylene-diene rubber (EPDM) Can be used.

なお、第１蓋部材２３と枠形部材２１との間にシール部材３５を介在させる代わりに、図９に示すように、第１蓋部材２３の本体部２３ａの、枠形部材２１の端部２１ｃに対向する位置に、枠形部材２１側に向かって突出するシール突起部２３ｃを設けてもよい。シール突起部２３ｃは、プレス加工等により蓋部材２３の一部として形成された、円弧状の断面を有しており、その頂部２３ｃａが枠形部材２１の端部２１ｃに圧接している。   Instead of interposing the seal member 35 between the first lid member 23 and the frame-shaped member 21, as shown in FIG. 9, the end portion of the frame-shaped member 21 of the main body portion 23a of the first lid member 23 You may provide the seal projection part 23c which protrudes toward the frame-shaped member 21 side in the position facing 21c. The seal projection 23 c has an arcuate cross section formed as a part of the lid member 23 by pressing or the like, and the top 23 ca is in pressure contact with the end 21 c of the frame-shaped member 21.

また、図示しないが、より強固な密閉性を確保するために、枠形部材２１と第１蓋部材２３とをシールするためのシール剤としてアスファルトピッチ、タールピッチ等を使用してもよい。シール剤を使用する場合、枠形部材の端部２１ｃ、シール溝３７の内壁面、シール部材３５、および第１蓋部材２３のこれらに接する部分にシール剤を塗布することが好ましい。   Although not shown, asphalt pitch, tar pitch, or the like may be used as a sealant for sealing the frame-shaped member 21 and the first lid member 23 in order to secure stronger sealing performance. When using the sealing agent, it is preferable to apply the sealing agent to the end portion 21c of the frame-shaped member, the inner wall surface of the sealing groove 37, the sealing member 35, and the portion of the first lid member 23 in contact with them.

また、本実施形態の第１蓋部材２３は、枠形部材２１の４つの外側面２１ｂに平行に延びる４つの側壁部２３ｂを有しているが、これらの側壁部２３ｂは、隣接する側壁部２３ｂ同士が連続的に、つまり側壁部２３ｂ間に隙間が存しないように形成されている。本実施形態では、第１蓋部材２３全体を絞り加工によって作製することにより、隣接する側壁部２３ｂ同士が連続的に形成されている。なお、隣接する側壁部２３ｂ同士を連続的に形成する方法としては、上記の絞り加工に限らず、例えば、側壁部２３ｂを折り曲げ加工により形成した後に隣接する側壁部２３ｂ同士を溶接するなど、どのような方法を採用してもよい。   Moreover, although the 1st cover member 23 of this embodiment has the four side wall parts 23b extended in parallel with the four outer side surfaces 21b of the frame-shaped member 21, these side wall parts 23b are adjacent side wall parts. 23b is formed continuously so that there is no gap between the side wall portions 23b. In this embodiment, the adjacent side wall parts 23b are continuously formed by producing the 1st cover member 23 whole by drawing. The method of continuously forming the adjacent side wall portions 23b is not limited to the drawing processing described above. For example, any method such as welding the adjacent side wall portions 23b after forming the side wall portions 23b by bending. Such a method may be adopted.

次に、本発明の第２実施形態に係る角形電池について、図１０を参照しながら説明する。なお、この第２実施形態は、以下に説明する点を除き、上記で説明した第１実施形態と同様の構成を有しており、その説明を省略する。   Next, a prismatic battery according to a second embodiment of the present invention will be described with reference to FIG. In addition, this 2nd Embodiment has the structure similar to 1st Embodiment demonstrated above except the point demonstrated below, The description is abbreviate | omitted.

図１０に示すように、本実施形態の電池Ｃにおいては、正極集電板を兼ねる第１蓋部材２３と正極体１３との間、および第２蓋部材２５と負極体１５との間に、それぞれ、対向方向Ｘに弾性を有するシート状の導電性の緩衝部材４１が介在している。すなわち、正極体１３の第１蓋部材２３側の一端部１３ａがほぼシート状のシート状緩衝部材４１の電極体１７側の裏面４１ａに接触し、シート状緩衝部材４１の第１蓋部材側の表面４１ｂが、第１蓋部材２３の集電面となる内側面２３ｄに接触している。同様に、負極体１５の第２蓋部材２５側の一端部１５ａが、シート状緩衝部材４１の電極体１７側の裏面４１ａに接触し、シート状緩衝部材４１の第２蓋部材側の表面４１ｂが、第２蓋部材２５の集電面となる内側面２５ｄに接触している。   As shown in FIG. 10, in the battery C of the present embodiment, between the first lid member 23 that also serves as the positive electrode current collector plate and the positive electrode body 13, and between the second lid member 25 and the negative electrode body 15, In each case, a sheet-like conductive buffer member 41 having elasticity in the facing direction X is interposed. That is, the one end portion 13a on the first lid member 23 side of the positive electrode body 13 is in contact with the back surface 41a on the electrode body 17 side of the substantially sheet-like sheet-like buffer member 41, and the sheet-like buffer member 41 on the first lid member side. The surface 41 b is in contact with the inner side surface 23 d that is the current collecting surface of the first lid member 23. Similarly, the one end portion 15a of the negative electrode body 15 on the second lid member 25 side contacts the back surface 41a of the sheet buffer member 41 on the electrode body 17 side, and the surface 41b of the sheet buffer member 41 on the second lid member side. Is in contact with the inner side surface 25d serving as the current collecting surface of the second lid member 25.

シート状緩衝部材４１は、例えば、図１１に示すように、金属製のシート４３の一方の面に、対向方向Ｘに沿って突出する多数の突起４３ａが対向方向Ｘと直交する方向に並べて設けられたものを使用して形成することができる。具体的には、図１１（ａ）に示すように、２枚の金属製シート４３を、互いの突起４３ａを有する面が対向する方向に、かつ、互いの突起４３ａ，４３ａが干渉しないように重ね合わせてシート状緩衝部材４１としてもよい。   For example, as shown in FIG. 11, the sheet-like buffer member 41 is provided on one surface of a metal sheet 43, in which a large number of protrusions 43 a protruding along the facing direction X are arranged in a direction orthogonal to the facing direction X. Can be used. Specifically, as shown in FIG. 11 (a), the two metal sheets 43 are placed in a direction in which the surfaces having the protrusions 43a face each other and so that the protrusions 43a and 43a do not interfere with each other. The sheet-like buffer member 41 may be superposed.

あるいは、図１１（ｂ）に示すように、突起を有する金属製シート４３の、突起４３ａを有する面に、平坦な金属製シート４５を重ね合わせてシート状緩衝部材４１としてもよい。この場合、平坦な金属製シート４５側が、シート状緩衝部材４１の電極体１７に接触する裏面４１ａとなり、突起を有する金属製シート４３側が、集電板に接触する表面４１ｂとなる。さらには、突起を有する金属製シート４３を単独でシート状緩衝部材４１として使用してもよい。この場合は、金属製シート４３の突起４３ａを有する面が、電極体１７に接触する面となる。   Alternatively, as shown in FIG. 11 (b), a flat metal sheet 45 may be superimposed on the surface of the metal sheet 43 having protrusions on the surface having the protrusions 43 a to form the sheet-like buffer member 41. In this case, the flat metal sheet 45 side is the back surface 41 a that contacts the electrode body 17 of the sheet-like buffer member 41, and the metal sheet 43 side that has the protrusions is the front surface 41 b that contacts the current collector plate. Furthermore, the metal sheet 43 having protrusions may be used alone as the sheet-like buffer member 41. In this case, the surface having the protrusion 43 a of the metal sheet 43 is a surface that contacts the electrode body 17.

このように、図１０に示した正極体１３・負極体１５と各蓋部材２３，２５との間に、弾性を有するシート状緩衝部材４１を介在させることにより、電池Ｃを交換するために電池モジュールＢ（図１）を組みなおすことにより発生し得る、正極体１３・負極体１５と各蓋部材２３，２５との間接触圧の低下、つまり電池Ｃの内部抵抗の上昇を抑制することができるので、電池モジュールＢの充放電性能を、電池Ｃの交換を行いながら長期に渡って維持することが可能となる。なお、突起を有する金属製シート４３の突起４３ａの形状は、図１１に示す円錐形状のほかに、角錐形状、円錐台形状、角錐台形状、ドーム形状など、適宜選択することができる。また、シート状緩衝部材４１を形成する導電性素材は、導電性、強度、耐食性等を考慮して適宜選択してよいが、本実施形態ではニッケルめっきを施した鋼板を使用している。   Thus, the battery C can be replaced in order to replace the battery C by interposing the elastic sheet-like buffer member 41 between the positive electrode body 13, the negative electrode body 15 and the lid members 23 and 25 shown in FIG. It is possible to suppress a decrease in contact pressure between the positive electrode body 13 and the negative electrode body 15 and the lid members 23 and 25, that is, an increase in the internal resistance of the battery C, which can occur by reassembling the module B (FIG. 1). Therefore, the charge / discharge performance of the battery module B can be maintained over a long period of time while replacing the battery C. In addition, the shape of the protrusion 43a of the metal sheet 43 having the protrusion can be appropriately selected from a cone shape shown in FIG. 11, a pyramid shape, a truncated cone shape, a truncated pyramid shape, a dome shape, and the like. Moreover, although the electroconductive raw material which forms the sheet-like buffer member 41 may be suitably selected in consideration of electroconductivity, strength, corrosion resistance, etc., in this embodiment, a steel plate subjected to nickel plating is used.

上記実各施形態に係る角形電池Ｃによれば、図２に示すように、係合凸部３１と係合凹部３３との係合により各蓋部材２３，２５の本体部２３ａ，２５ａが枠形部材２１に向かって引き寄せられることで、、電池Ｃ単体でケーシング１９の密閉性が確保される。したがって、この電池Ｃを複数積層して構成した図１の電池モジュールＢを解体した場合にも、電池Ｃからの電解液漏れが防止されるので、電池モジュールＢの電池交換を容易に行うことができる。これにより、電池モジュールＢの充放電性能を、電池Ｃの交換を行いながら長期に渡って維持することが可能となる。   According to the prismatic battery C according to each of the above embodiments, as shown in FIG. 2, the main body portions 23 a and 25 a of the lid members 23 and 25 are framed by the engagement of the engagement convex portion 31 and the engagement concave portion 33. By being drawn toward the shape member 21, the sealing performance of the casing 19 is secured by the battery C alone. Therefore, even when the battery module B of FIG. 1 configured by stacking a plurality of the batteries C is disassembled, the electrolyte solution from the battery C is prevented from leaking, so that the battery replacement of the battery module B can be easily performed. it can. Thereby, it becomes possible to maintain the charging / discharging performance of the battery module B over a long period of time while replacing the battery C.

以上のとおり、図面を参照しながら本発明の好適な実施形態を説明したが、本発明の趣旨を逸脱しない範囲内で、種々の追加、変更または削除が可能である。したがって、そのようなものも本発明の範囲内に含まれる。   As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

１９ ケーシング
２１ 枠形部材
２１ａ 枠形部材の開口部
２１ｂ 枠形部材の外側面
２３ 第１蓋部材
２３ａ 第１蓋部材の本体部
２３ｂ 第１蓋部材の側壁部
２５ 第２蓋部材
２５ａ 第２蓋部材の本体部
２５ｂ 第２蓋部材の側壁部
３１ 係合凸部
３３ 係合凹部
Ｃ 電池
Ｂ 電池モジュール 19 casing 21 frame-shaped member 21a frame-shaped member opening 21b frame-shaped member outer surface 23 first lid member 23a first lid member body 23b first lid member side wall 25 second lid member 25a second lid Main body part 25b Side wall part 31 of second lid member Engaging convex part 33 Engaging concave part C Battery B Battery module

Claims (7)

矩形の枠形部材と、この枠形部材の両開口部を覆う導電性材料からなる平板状の第１蓋部材および第２蓋部材とを有するケーシングを備える角形電池であって、
前記第１蓋部材および第２蓋部材の間に、これら蓋部材の対向方向と直交する方向にセパレータを介して交互に積層された、複数の平板状の正極体および負極体が収容されており、
前記正極体は前記第１蓋部材に電気的に接続されており、前記負極体は前記第２蓋部材に電気的に接続されており、
前記第１蓋部材および第２蓋部材が、それぞれ、平板状の本体部と、この本体部の縁部から両蓋部材の対向方向に突設された側壁部とを有し、
前記側壁部に、内側に突出する係合凸部が設けられ、
前記枠形部材の外側面に、前記係合凸部に係合して、前記各蓋部材の本体部を前記枠形部材に向かって引き寄せる係合凹部が形成されている角形電池。 A rectangular battery comprising a casing having a rectangular frame-shaped member and a flat plate-like first lid member and a second lid member made of a conductive material covering both openings of the frame-shaped member,
Between the first lid member and the second lid member, a plurality of flat plate positive electrode bodies and negative electrode bodies, which are alternately stacked via separators in a direction perpendicular to the facing direction of the lid members, are accommodated. ,
The positive electrode body is electrically connected to the first lid member, and the negative electrode body is electrically connected to the second lid member;
Each of the first lid member and the second lid member has a flat plate-like main body portion and a side wall portion projecting from the edge portion of the main body portion in the opposing direction of the both lid members,
The side wall is provided with an engaging projection protruding inward,
A prismatic battery in which an engagement concave portion is formed on an outer surface of the frame-shaped member so as to engage with the engagement convex portion and draw the main body portion of each lid member toward the frame-shaped member. 請求項１において、前記第１蓋部材および第２蓋部材が、それぞれ、前記枠形部材の４つの側面に沿って延びる４つの前記側壁部を有しており、各側壁部に少なくとも１つの前記係合凸部が設けられており、前記枠形部材の各側面に、前記各係合凸部に対応する係合凹部が設けられている角形電池。   2. The first lid member and the second lid member according to claim 1, each having four side wall portions extending along four side surfaces of the frame-shaped member, and at least one of the side wall portions on each side wall portion. A prismatic battery in which an engaging convex portion is provided, and an engaging concave portion corresponding to each engaging convex portion is provided on each side surface of the frame-shaped member. 請求項１または２において、前記枠形部材と前記第１蓋部材の本体部との間、および、前記枠形部材と前記第２蓋部材の本体部との間に、それぞれ、前記対向方向に弾性を有するシール部材が介在している角形電池。   In Claim 1 or 2, between the frame-shaped member and the main body portion of the first lid member, and between the frame-shaped member and the main body portion of the second lid member, respectively, in the facing direction. A prismatic battery in which a sealing member having elasticity is interposed. 請求項３において、前記枠形部材に、前記シール部材を受け入れるシール溝が設けられている角形電池。   4. The prismatic battery according to claim 3, wherein the frame-shaped member is provided with a seal groove for receiving the seal member. 請求項４において、前記シール溝の深さ寸法が、前記シール部材の高さ寸法に対して５０％〜９０％の範囲内に設定されている角形電池。   5. The prismatic battery according to claim 4, wherein a depth dimension of the seal groove is set in a range of 50% to 90% with respect to a height dimension of the seal member. 請求項１〜５のいずれか一項において、前記第１蓋部材と前記正極体の間、および前記第２蓋部材と前記負極体の間に、それぞれ、前記蓋部材の対向方向に弾性を有するシート状の導電性の緩衝部材が介在している角形電池。 The elastic member according to any one of claims 1 to 5 , wherein the first cover member and the positive electrode body and the second cover member and the negative electrode body are respectively elastic in a facing direction of the cover member. A prismatic battery in which a sheet-like conductive buffer member is interposed. 請求項６において、前記緩衝部材は、前記対向方向と直交する方向に並んだ多数の突起を有する金属板を含む角形電池。   7. The prismatic battery according to claim 6, wherein the buffer member includes a metal plate having a large number of protrusions arranged in a direction orthogonal to the facing direction.
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