JP5863417B2 - Stacked battery module and battery used therefor - Google Patents

Stacked battery module and battery used therefor Download PDF

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JP5863417B2
JP5863417B2 JP2011258545A JP2011258545A JP5863417B2 JP 5863417 B2 JP5863417 B2 JP 5863417B2 JP 2011258545 A JP2011258545 A JP 2011258545A JP 2011258545 A JP2011258545 A JP 2011258545A JP 5863417 B2 JP5863417 B2 JP 5863417B2
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battery
positive electrode
electrode terminal
negative electrode
terminal member
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JP2013114832A (en
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淳一 谷内田
淳一 谷内田
誠二 寺田
誠二 寺田
憲仁 桧垣
憲仁 桧垣
篤 近藤
篤 近藤
海野　誠
誠 海野
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Description

本発明は、複数の単位電池を積層して構成される積層型電池モジュール、および、この積層型電池モジュールを構成する単位電池の構造に関する。   The present invention relates to a stacked battery module configured by stacking a plurality of unit cells, and a structure of a unit battery constituting the stacked battery module.

近年、省エネルギーやＣＯ２削減への配慮から、風力発電や太陽光発電のような自然エネルギーを利用した発電設備で使用する電力平準化用の二次電池が開発されている。また、同様に環境問題対策として、自動車や電車などの車両に搭載する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るとともに、ＣＯ２の排出量を削減することができる。 In recent years, secondary batteries for power leveling used in power generation facilities using natural energy such as wind power generation and solar power generation have been developed in consideration of energy saving and CO 2 reduction. Similarly, secondary batteries mounted on vehicles such as cars and trains have been developed as countermeasures for environmental problems. When equipped with the secondary battery in a vehicle, keep stored regenerative electric power during braking to the mounting battery, because it can be used as a power source of the vehicle, to increase the energy efficiency of the vehicle operation, the CO 2 Emissions can be reduced.

上記のような車両用の電池には、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、複数個の電池を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。複数の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部材を兼ねる２つの蓋状の部材間に、絶縁性材料からなる矩形の枠部材を介在させて電池のケーシングを形成し、電極体および電解液を収納するものが提案されている（例えば、特許文献１参照）。このような構造を有する電池を使用すれば、隣接する電池の一方の正極端子部材と他方の負極端子部材とが互いに接触するように複数の電池を積層させるだけで、複数の角形電池を直列に接続することができるので、電池モジュールの構造を簡単にすることができる。   Since the battery for vehicles as described above requires higher voltage and higher energy capacity than those used in conventional portable devices, a battery module configured by combining a plurality of batteries is used. It is common. As a unit battery structure for combining a plurality of batteries to be used as a battery module, for example, a rectangular frame made of an insulating material between two lid-like members serving as both positive and negative terminal members arranged opposite to each other There has been proposed one in which a battery casing is formed by interposing a member and an electrode body and an electrolytic solution are accommodated (for example, see Patent Document 1). If a battery having such a structure is used, a plurality of prismatic batteries are connected in series simply by stacking a plurality of batteries so that one positive electrode terminal member and the other negative electrode terminal member of adjacent batteries are in contact with each other. Since it can connect, the structure of a battery module can be simplified.

国際公開第２００９／１２５５４４号International Publication No. 2009/125544

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。また、２つの蓋状部材の側部が対向方向に折り曲げられて、枠部材の外周部の一部を覆っているので、蓋状部材間で外部短絡が起こるのを防止するために、電池の積層体を絶縁用部材で覆う必要がある。電池のケーシング構造を改良することにより、これらの密閉確保用部材および外部短絡防止用部材を省くことができれば、電池モジュールの体積および重量を大幅に低減することが可能となる。   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. In addition, since the side portions of the two lid-like members are bent in the opposite direction and cover a part of the outer peripheral portion of the frame member, in order to prevent an external short circuit between the lid-like members, It is necessary to cover the laminate with an insulating member. By improving the casing structure of the battery, if the sealing member and the external short-circuit preventing member can be omitted, the volume and weight of the battery module can be significantly reduced.

また、電池モジュールが使用される機器の仕様に応じて、電池モジュールを構成する電池の積層数を変更することにより電池モジュールの寸法や出力電圧を変更する場合、上記の従来の電池モジュールでは、密閉確保用部材や外部短絡防止用部材など多くの部品の設計を変更する必要があり、柔軟な対応が困難であった。   In addition, when the dimensions and output voltage of the battery module are changed by changing the number of battery stacks constituting the battery module according to the specifications of the device in which the battery module is used, the above conventional battery module is hermetically sealed. It was necessary to change the design of many parts such as a securing member and an external short-circuit preventing member, and it was difficult to respond flexibly.

本発明の目的は、上記の課題を解決するために、組立てが容易な構造を有しながら、従来の電池モジュール構造に必要とされた密閉確保用部材や外部短絡防止用部材を省いて電池モジュールの体積および重量を低減することが可能で、かつ種々の仕様の機器に柔軟に対応可能な電池モジュールを提供することにある。   The object of the present invention is to solve the above-mentioned problems, while omitting the sealing member and the external short-circuit prevention member required for the conventional battery module structure while having a structure that can be easily assembled. It is an object of the present invention to provide a battery module that can reduce the volume and weight of the battery and that can flexibly support equipment of various specifications.

前記した目的を達成するために、本発明に係る積層型電池モジュール用電池は、複数の電池を積層してなる積層型電池モジュールを構成する電池であって、セパレータを介して互いに対向する正極および負極を含む電極体を電解液とともに収納するケーシングを備えており、当該ケーシングが、導電性の板材から形成され、電池の外部に露出する部分が正極端子として機能し、電池の内部に向く面が正極集電面として機能する正極端子部材と、導電性の板材から形成され、前記正極端子部材に対向して配置されて、電池の外部に露出する部分が負極端子面として機能し、電池の内部に向く面が負極集電面として機能する負極端子部材と、前記正極端子部材および負極端子部材の間に介在し、かつ当該ケーシングの外周部を形成する、絶縁性材料からなる枠部材と、前記枠部材と前記正極端子部材との間、および前記枠部材と前記負極端子部材との間にそれぞれ介在するシール部材とを有しており、前記枠部材の外周部に、前記正極端子部材と負極端子部材とが対向する方向に貫通する貫通孔が複数設けられている。   In order to achieve the above-described object, a battery for a stacked battery module according to the present invention is a battery constituting a stacked battery module formed by stacking a plurality of batteries, and includes a positive electrode and a positive electrode facing each other via a separator. A casing for storing an electrode body including a negative electrode together with an electrolytic solution is provided, and the casing is formed of a conductive plate material, and a portion exposed to the outside of the battery functions as a positive electrode terminal, and a surface facing the inside of the battery A positive electrode terminal member that functions as a positive electrode current collecting surface, and a conductive plate material. The portion that is disposed to face the positive electrode terminal member and that is exposed to the outside of the battery functions as a negative electrode terminal surface. A negative electrode terminal member that functions as a negative electrode current collecting surface, and an insulating material that is interposed between the positive electrode terminal member and the negative electrode terminal member and that forms an outer peripheral portion of the casing And a seal member interposed between the frame member and the positive electrode terminal member, and between the frame member and the negative electrode terminal member, respectively, on the outer periphery of the frame member A plurality of through-holes penetrating in the direction in which the positive electrode terminal member and the negative electrode terminal member face each other are provided.

また、本発明に係る電池モジュールは、上記の電池を単位電池として、複数の該単位電池を、隣接し合う単位電池の一方の前記正極端子部材と他方の負極端子部材とが対向する方向に積層してなる積層型電池モジュールであって、積層された複数の単位電池の各々に設けられた前記貫通孔に積層方向に挿通された連結部材によって複数の前記単位電池が連結されている。   In the battery module according to the present invention, the unit battery is used as a unit cell, and a plurality of the unit cells are stacked in a direction in which one positive electrode terminal member and the other negative electrode terminal member of the adjacent unit cells face each other. The plurality of unit cells are connected by a connecting member inserted in the stacking direction into the through hole provided in each of the stacked unit cells.

この構成によれば、正極及び負極端子部材と枠部材との間にシール部材を設けているので、各単位電池の枠部材に設けられた貫通孔に挿通された、連結ボルトのような長尺の連結部材のみによって電池モジュールを構成することが可能になり、電池の密閉性確保のための締め付け用部材を追加する必要がない。また、単位電池のケーシングの外周部が絶縁性材料によって形成されているので、さらなる絶縁用部材で覆う必要がない。したがって、電池モジュールが大幅に小型化、軽量化できる。さらに、電池モジュールにおける単位電池の積層数を変更する場合、連結部材の長さ寸法のみを変更すればよいので、多様な機器に対して柔軟に仕様変更することが可能となる。   According to this configuration, since the sealing member is provided between the positive electrode and negative electrode terminal members and the frame member, a long member such as a connecting bolt inserted through the through hole provided in the frame member of each unit battery. The battery module can be configured only by the connecting member, and it is not necessary to add a fastening member for ensuring the sealing property of the battery. Moreover, since the outer peripheral part of the casing of a unit cell is formed with the insulating material, it is not necessary to cover with the member for insulation further. Therefore, the battery module can be greatly reduced in size and weight. Furthermore, when changing the number of unit cells stacked in the battery module, it is only necessary to change the length dimension of the connecting member, so that it is possible to flexibly change the specifications for various devices.

本発明の一実施形態に係る電池において、前記正極端子部材が、平板状の正極端子面部と、この正極端子面部に突設された、互いに平行に延びる複数の正極側突条部とを有しており、前記負極端子部材が、平板状の負極端子面部と、この正極端子面部に突設された、互いに平行に延びる複数の負極側突条部とを有していることが好ましい。また、この電池を用いる積層型電池モジュールにおいて、隣接する一方の単位電池の前記正極端子面部および前記正極側突条部と、他方の単位電池の前記負極端子面部および前記負極側突条部とによって冷却用空気の通路が形成されていることが好ましい。このように構成することにより、積層される単位電池間に冷却空気用通路を別途設ける必要がないので、電池モジュールのさらなる小型化、軽量化を図りつつ、電池モジュール内部を効率的に冷却することができる。   In the battery according to an embodiment of the present invention, the positive electrode terminal member has a flat positive electrode terminal surface portion and a plurality of positive electrode side protrusions that protrude from the positive electrode terminal surface portion and extend in parallel to each other. It is preferable that the negative electrode terminal member has a flat negative electrode terminal surface portion and a plurality of negative electrode side protrusions protruding from the positive electrode terminal surface portion and extending in parallel with each other. Moreover, in the stacked battery module using this battery, the positive electrode terminal surface portion and the positive electrode side ridge portion of one adjacent unit battery, and the negative electrode terminal surface portion and the negative electrode side ridge portion of the other unit battery. Preferably, a cooling air passage is formed. With this configuration, there is no need to separately provide a cooling air passage between the stacked unit cells, so that the inside of the battery module can be efficiently cooled while further reducing the size and weight of the battery module. Can do.

また、本発明の一実施形態に係る電池において、前記枠部材の、前記突条部の延設方向における一端部に、前記対向方向に貫通する開口が設けられていることが好ましい。また、この電池を用いる積層型電池モジュールにおいて、積層方向に並ぶ各開口によって形成された空間が、前記冷却用空気通路に連通する空気導入路を形成していることが好ましい。この構成によれば、冷却用空気の導入路を確保するための部材を電池モジュール内に別途設ける必要がないので、電池モジュールのさらなる小型化、軽量化を図りつつ、電池モジュール内部を効率的に冷却することができる。   Moreover, the battery which concerns on one Embodiment of this invention WHEREIN: It is preferable that the opening penetrated in the said opposing direction is provided in the one end part in the extension direction of the said rib part of the said frame member. In the stacked battery module using the battery, it is preferable that the space formed by the openings arranged in the stacking direction forms an air introduction path communicating with the cooling air passage. According to this configuration, there is no need to separately provide a member for securing a cooling air introduction path in the battery module. Therefore, the battery module can be efficiently reduced in size while further reducing the size and weight of the battery module. Can be cooled.

また、本発明の一実施形態に係る電池において、前記電極体が、前記セパレータを介して互いに対向するシート状の前記正極と前記負極とを捲回してなる円筒形状を有して、その軸心方向が前記対向方向に沿うように配置されており、前記電極体の軸心方向の一端部から前記正極が突出して前記正極集電面に接触し、前記電極体の軸心方向の他端部から前記負極が突出して前記負極集電面に接触していてもよい。このように構成することにより、電極体の、両端子部材間の対向方向に対する機械的強度が増すので、両端子部材を対向方向に強く押し付けることができる。したがって、電極体と各端子部材との接触抵抗を低減して、電池の内部抵抗を下げることが可能となる。   Further, in the battery according to one embodiment of the present invention, the electrode body has a cylindrical shape formed by winding the sheet-like positive electrode and the negative electrode facing each other with the separator interposed therebetween, and the axial center thereof. The positive electrode protrudes from one end portion in the axial direction of the electrode body and contacts the positive electrode current collecting surface, and the other end portion in the axial direction of the electrode body. The negative electrode may protrude from and contact the negative electrode current collector surface. By comprising in this way, since the mechanical strength with respect to the opposing direction between both terminal members of an electrode body increases, both terminal members can be strongly pressed to an opposing direction. Therefore, the contact resistance between the electrode body and each terminal member can be reduced, and the internal resistance of the battery can be lowered.

以上のように、本発明に係る積層型電池モジュールによれば、単位電池の密閉性を向上させ、かつ、外部短絡の発生しにくいケーシング構造とすることにより、従来の電池モジュール構造に必要とされた密閉確保用部材や外部短絡防止用部材を省いて電池モジュールの体積および重量を低減することが可能であるので、電池モジュールの大幅な小型化および軽量化が可能になる。   As described above, according to the multilayer battery module according to the present invention, it is necessary for the conventional battery module structure by improving the hermeticity of the unit battery and making the casing structure less likely to cause an external short circuit. In addition, since it is possible to reduce the volume and weight of the battery module by omitting the sealing member and the external short-circuit preventing member, the battery module can be significantly reduced in size and weight.

本発明の一実施形態に係る積層型電池モジュールの構造を示す図であり、（ａ）が平面図、（ｂ）が部分破断側面図である。It is a figure which shows the structure of the laminated battery module which concerns on one Embodiment of this invention, (a) is a top view, (b) is a partially broken side view. 本発明の第１実施形態に係る単位電池を示す断面図である。It is sectional drawing which shows the unit battery which concerns on 1st Embodiment of this invention. 本発明の一実施形態に係る電池に使用される電極体の構造を示す図であり、（ａ）が縦断面図、（ｂ）が平面図である。It is a figure which shows the structure of the electrode body used for the battery which concerns on one Embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view. 本発明の一実施形態に係る電池に使用される正極端子部材を示す正面図である。It is a front view which shows the positive electrode terminal member used for the battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電池に使用される枠部材を示す正面図である。It is a front view which shows the frame member used for the battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電池に使用される正極端子部材および負極端子部材の形状の例を示す平面図である。It is a top view which shows the example of the shape of the positive electrode terminal member used for the battery which concerns on one Embodiment of this invention, and a negative electrode terminal member. 本発明の一実施形態に係る電池に使用される枠部材を示す斜視図である。It is a perspective view which shows the frame member used for the battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電池モジュールに使用される端板を示す正面図である。It is a front view which shows the end plate used for the battery module which concerns on one Embodiment of this invention.

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に、本発明の一実施形態に係る電池モジュールＢの構造を示す。この電池モジュールＢは、例えば、電車のような車両に搭載されるものであって、角形電池である単位電池（以下単に「電池」という。）Ｃを、電池Ｃの厚み方向に複数個（この実施形態では３０個）積層し、連結部材である長尺の連結ボルト１および連結ナット２によってこれらの単位電池Ｃを互いに連結することにより構成している。電池モジュールＢの構造については、後に詳述する。   In FIG. 1, the structure of the battery module B which concerns on one Embodiment of this invention is shown. The battery module B is mounted on a vehicle such as a train, for example, and includes a plurality of unit batteries (hereinafter simply referred to as “batteries”) C that are rectangular batteries in the thickness direction of the battery C (this In the embodiment, 30 units are stacked, and the unit cells C are connected to each other by long connecting bolts 1 and connecting nuts 2 which are connecting members. The structure of the battery module B will be described in detail later.

図２は、電池Ｃの構造を示す断面図である。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ニッケル水素二次電池として構成されており、互いに対向するように配置された正極端子部材３および負極端子部材５と、両端子部材３，５間に介在する、絶縁性材料からなるほぼ矩形の枠部材７とによって、電池Ｃの角形のケーシング９が構成されている。なお、以下の説明において、両端子部材３，５が対向する方向を単に対向方向Ｘと呼ぶ。さらに、矩形の枠部材７の互いに対向する２組の辺の一方の対向方向を横方向Ｙと呼び、これに直交する他方の対向方向を縦方向Ｚと呼ぶ。   FIG. 2 is a cross-sectional view showing the structure of the battery C. The battery C is configured as a nickel hydride secondary battery 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, so as to face each other. The rectangular casing 9 of the battery C is constituted by the arranged positive electrode terminal member 3 and negative electrode terminal member 5 and the substantially rectangular frame member 7 made of an insulating material interposed between the both terminal members 3 and 5. Yes. In the following description, the direction in which the two terminal members 3 and 5 face each other is simply referred to as the facing direction X. Further, one opposing direction of two sets of opposite sides of the rectangular frame member 7 is referred to as a lateral direction Y, and the other opposing direction orthogonal thereto is referred to as a longitudinal direction Z.

同図に示すように、ケーシング９の内方には、セパレータを介して互いに対向する正極１３および負極１５を含む電極体１７が、電解液とともに収容されている。電極体１７は、図３に示すように円筒状に形成されており、その軸心が対向方向Ｘに沿うように配置されている。図３（ａ）に示すように、電極体１７は、正極活物質を含むシート状の正極１３と、負極活物質を含むシート状の負極１５と、これら正極１３、負極１５間に介在する２枚のシート状の第１セパレータ１９、第２セパレータ２１とを備える。両セパレータ１９，２１は、正極１３、負極１５間を電気絶縁するとともに、各セパレータ１９，２１に含まれる電解液を介してイオンを伝導させる。   As shown in the figure, an electrode body 17 including a positive electrode 13 and a negative electrode 15 facing each other through a separator is accommodated inside the casing 9 together with an electrolytic solution. As shown in FIG. 3, the electrode body 17 is formed in a cylindrical shape, and is arranged so that its axis is along the facing direction X. As shown in FIG. 3A, the electrode body 17 includes a sheet-like positive electrode 13 containing a positive electrode active material, a sheet-like negative electrode 15 containing a negative electrode active material, and 2 interposed between the positive electrode 13 and the negative electrode 15. A sheet-like first separator 19 and a second separator 21 are provided. Both separators 19, 21 electrically insulate between the positive electrode 13 and the negative electrode 15, and conduct ions through the electrolyte contained in each separator 19, 21.

正極１３、第１セパレータ１９、負極１５および第２セパレータ２１は、この順に密着するように重ね合わされた状態から、図３（ｂ）に示すように、電極体１７の最外周層が第２セパレータ２１になるように渦巻き状に捲回されている。すなわち、第１セパレータ１９と第２セパレータ２１とが、電極体１７の径方向内側に向かって正極１３と負極１５との間に形成される複数の層間に交互に介在する。   From the state in which the positive electrode 13, the first separator 19, the negative electrode 15, and the second separator 21 are stacked so as to be in close contact with each other in this order, as shown in FIG. 3B, the outermost peripheral layer of the electrode body 17 is the second separator. It is wound in a spiral shape to be 21. That is, the first separator 19 and the second separator 21 are alternately interposed between a plurality of layers formed between the positive electrode 13 and the negative electrode 15 toward the radially inner side of the electrode body 17.

また、電極体１７の軸心方向の一端部（図３（ａ）の上端部）において、負極１５の一端部１５ａが突出しており、電極体１７の軸心方向の他端部（図３（ａ）の下端部）において、正極１３の一端部１３ａが突出している。一方、正極１３の他方の端部１３ｂおよび負極１５の他方の端部１５ｂは、それぞれ、これらセパレータ１９、２１から突出しないように配置されている。これら端部１３ｂ、１５ｂを、セパレータ１９，２１の端部を折り曲げることによりセパレータ１９，２１で覆ってもよい。なお、正極１３の配置と負極１５の配置とは入れ替えてもよい。   Further, one end 15a of the negative electrode 15 protrudes at one end in the axial direction of the electrode body 17 (upper end in FIG. 3A), and the other end in the axial direction of the electrode body 17 (FIG. 3 ( At one lower end portion of a), one end portion 13a of the positive electrode 13 protrudes. On the other hand, the other end 13 b of the positive electrode 13 and the other end 15 b of the negative electrode 15 are arranged so as not to protrude from the separators 19 and 21, respectively. These end portions 13 b and 15 b may be covered with the separators 19 and 21 by bending the end portions of the separators 19 and 21. The arrangement of the positive electrode 13 and the arrangement of the negative electrode 15 may be interchanged.

したがって、図２に示すように、正極１３の端部１３ａは、正極端子部材３の電池内部に向く面に接触している。つまり、正極端子部材３の電池内部に向く面は、正極側の集電面として機能する。これにより、正極端子部材３の電池外部に露出する部分が、電池Ｃから電流を取り出す際の正極側の端子として機能する。同様に、負極端子部材５の電池内部に向く面は、負極側の集電面として機能し、電池外部に露出する部分は、負極側の端子として機能する。なお、正極１３の端部１３ａは、正極端子部材３の集電面に対して、単に圧接されていてもよく、または、溶接、接着もしくはかしめ等によって接合されていてもよい。負極側についても同様である。   Therefore, as shown in FIG. 2, the end 13 a of the positive electrode 13 is in contact with the surface of the positive electrode terminal member 3 facing the inside of the battery. That is, the surface of the positive electrode terminal member 3 facing the battery functions as a current collecting surface on the positive electrode side. Thereby, the part exposed to the battery exterior of the positive electrode terminal member 3 functions as a terminal on the positive electrode side when taking out the current from the battery C. Similarly, the surface of the negative electrode terminal member 5 facing the inside of the battery functions as a current collecting surface on the negative electrode side, and the portion exposed to the outside of the battery functions as a terminal on the negative electrode side. Note that the end portion 13a of the positive electrode 13 may be simply pressed against the current collecting surface of the positive electrode terminal member 3, or may be joined by welding, adhesion, caulking, or the like. The same applies to the negative electrode side.

電極体１７は、上記の円筒状構造に限らず、例えば、正極１３と負極１５とがプリーツ状のセパレータを介して交互に積層されて対向するプリーツ構造を有するものであってよい。しかし、本実施形態のように構成することにより、電極体１７の、対向方向Ｘに対する機械的強度が増すので、両端子部材３，５を対向方向Ｘに強く押し付けることができる。したがって、電極体１７と各端子部材３，５との接触抵抗を低減して、電池Ｃの内部抵抗を下げることが可能となる。   The electrode body 17 is not limited to the cylindrical structure described above, and may have, for example, a pleated structure in which the positive electrodes 13 and the negative electrodes 15 are alternately stacked via pleated separators. However, since the mechanical strength of the electrode body 17 with respect to the facing direction X is increased by configuring as in the present embodiment, both the terminal members 3 and 5 can be strongly pressed in the facing direction X. Therefore, the contact resistance between the electrode body 17 and each of the terminal members 3 and 5 can be reduced, and the internal resistance of the battery C can be lowered.

正極端子部材３は、平板状の正極端子面部３ａと、正極端子面部３ａの一方の主面側に突出する複数の正極側突条部３ｂとを有する。本実施形態では、各正極側突条部３ｂは、正極端子部材３に一体的に突設された立壁として形成されている。正極端子部材３の正面図である図４に示すように、複数の正極側突条部３ｂは、正極端子面部３ａの縦方向Ｚの一端から他端まで、互いに平行に延びており、横方向Ｙに等間隔に配置されている。図２に示すように、負極端子部材５は、正極端子部材３とほぼ同様の構造を有しており、平板状の負極端子面部５ａと、負極端子面部５ａの一方の主面側に突出する複数の負極側突条部５ｂとを有する。   The positive electrode terminal member 3 includes a flat plate-like positive electrode terminal surface portion 3a and a plurality of positive electrode side protrusions 3b protruding to one main surface side of the positive electrode terminal surface portion 3a. In the present embodiment, each positive-side protruding ridge 3 b is formed as a standing wall that protrudes integrally with the positive-electrode terminal member 3. As shown in FIG. 4, which is a front view of the positive electrode terminal member 3, the plurality of positive electrode side protrusions 3 b extend in parallel from one end to the other end in the vertical direction Z of the positive electrode terminal surface portion 3 a. Y is arranged at equal intervals. As shown in FIG. 2, the negative electrode terminal member 5 has substantially the same structure as that of the positive electrode terminal member 3, and protrudes toward one main surface side of the flat negative electrode terminal surface portion 5a and the negative electrode terminal surface portion 5a. A plurality of negative electrode side protrusions 5b.

複数の電池Ｃが積層された状態で、互いに隣接する２つの電池Ｃのうちの、一方の電池Ｃの正極端子部材３の突条部３ｂと、他方の電池Ｃの負極端子部材５の突条部５ｂとは、冷却空気を通過させるための冷却通路２５を形成する。より詳細には、各電池Ｃの正極側突条部３ｂの正極端子面部３ａからの高さ寸法と、負極側突条部５ｂの負極端子面部５ａからの高さ寸法とはほぼ同一に設定されており、かつ、一方の電池Ｃの各突条部３ｂの横方向Ｙの位置は、他方の電池Ｃの各突条部５ｂの横方向位置からずれるように設定されている。したがって、一方の電池Ｃにおける正極端子部材３の突条部３ｂの先端３ｂａは、他方の電池Ｃにおける負極端子部材５の端子面部５ａに接触し、他方の電池Ｃにおける負極端子部材５の突条部５ｂの先端５ｂａは、一方の電池Ｃにおける正極端子部材３の端子面部３ａに接触し、両突条部３ｂ、５ｂ間に形成された空間が、冷却通路２５となる。なお、本実施形態において、一方の電池Ｃの各突条部３ｂの横方向Ｙの位置は、他方の電池Ｃの隣接する２つの突条部５ｂ，５ｂのほぼ中央位置となるように設定されており、各冷却通路２５はほぼ同一の流路断面積を有している。   Of the two batteries C adjacent to each other in a state where a plurality of batteries C are stacked, the protrusion 3b of the positive terminal member 3 of one battery C and the protrusion of the negative terminal member 5 of the other battery C The part 5b forms a cooling passage 25 for allowing cooling air to pass therethrough. More specifically, the height dimension from the positive electrode terminal surface part 3a of the positive electrode side protrusion 3b of each battery C and the height dimension from the negative electrode terminal surface part 5a of the negative electrode side protrusion 5b are set to be substantially the same. And the position of the horizontal direction Y of each protrusion 3b of one battery C is set so that it may shift | deviate from the horizontal direction position of each protrusion 5b of the other battery C. Therefore, the tip 3ba of the protrusion 3b of the positive electrode terminal member 3 in one battery C is in contact with the terminal surface portion 5a of the negative electrode terminal member 5 in the other battery C, and the protrusion of the negative electrode terminal member 5 in the other battery C. The tip 5ba of the part 5b is in contact with the terminal surface part 3a of the positive electrode terminal member 3 in one battery C, and the space formed between the two protrusions 3b, 5b becomes the cooling passage 25. In the present embodiment, the position in the lateral direction Y of each protrusion 3b of one battery C is set to be substantially the center position of two adjacent protrusions 5b, 5b of the other battery C. Each cooling passage 25 has substantially the same flow path cross-sectional area.

このように、正極端子部材３の正極側突条部３ｂと、負極端子部材５の負極側突条部５ｂとが互いに干渉せずに所定の位置に交互に配置されるように、正極端子部材３および負極端子部材５の一側面には、図４に示すように、誤配置防止用突起２７が設けられており（図４では正極端子部材３のみ図示）、枠部材７を示す正面図である図５に示すように、枠部材７における、誤配置防止用突起２７に対応する位置には、誤配置防止用凹所２９が設けられている。   In this way, the positive electrode terminal member 3 so that the positive electrode side protrusions 3b of the positive electrode terminal member 3 and the negative electrode side protrusions 5b of the negative electrode terminal member 5 are alternately arranged at predetermined positions without interfering with each other. 3 and the negative electrode terminal member 5 are provided with a misposition prevention protrusion 27 as shown in FIG. 4 (only the positive electrode terminal member 3 is shown in FIG. 4), and is a front view showing the frame member 7. As shown in FIG. 5, a misplacement prevention recess 29 is provided in the frame member 7 at a position corresponding to the misplacement prevention protrusion 27.

なお、本実施形態では、複数の正極側突条部３ｂおよび複数の負極側突条部５ｂを、それぞれ横方向Ｙに等間隔に配置したが、これら突条部３ｂ，５ｂの配置間隔は適宜変更してよい。また、正極側突条部３ｂ、負極側突条部５ｂとして、本実施形態のように、正極側端子面部３ａに一体に突設された立壁として形成することが、部品数を低減して電池Ｃ全体を軽量化する点からは好ましいが、この例に限らず、例えば図６に示すように、平板状の正極端子面部３ａとは別体に、板状の金属板を山形（図６（ａ））や台形（図６（ｂ））に形成して正極側突条部３ｂを作製し、これら正極端子面部３ａと正極側突条部３ｂとを組み合わせて正極端子部材３として用いてもよい。負極端子部材５についても同様である。なお、この場合は、両突条部３ｂ、５ｂ間に形成された空間のほかに、正極端子面部３ａと正極側突上部３ｂとの間に形成された空間、および負極端子面部５ａと負極側突上部５ｂとの間に形成された空間も冷却通路２５として機能する。   In the present embodiment, the plurality of positive electrode side protrusions 3b and the plurality of negative electrode side protrusions 5b are arranged at equal intervals in the lateral direction Y, but the arrangement intervals of these protrusions 3b and 5b are appropriately determined. You may change it. Further, as the positive electrode side protrusion 3b and the negative electrode side protrusion 5b, as in the present embodiment, it is formed as a standing wall integrally protruding on the positive electrode side terminal surface 3a. Although it is preferable from the point of reducing the weight of C as a whole, the present invention is not limited to this example. For example, as shown in FIG. 6, a plate-like metal plate is formed in a mountain shape (see FIG. a)) or a trapezoidal shape (FIG. 6 (b)) to produce the positive electrode side protrusion 3b, and the positive electrode terminal surface part 3a and the positive electrode side protrusion 3b may be combined and used as the positive electrode terminal member 3. Good. The same applies to the negative electrode terminal member 5. In this case, in addition to the space formed between the protrusions 3b and 5b, the space formed between the positive terminal surface 3a and the positive protrusion 3b, and the negative terminal surface 5a and the negative electrode A space formed between the protruding portion 5 b also functions as the cooling passage 25.

正極端子部材３および負極端子部材５は、本実施形態では、ニッケルめっきを施した鋼板によって形成されている。これら端子部材３，５は、金属のような導電性を有していればどのようなものを用いてもよく、例えばアルミニウムを使用することができるが、耐電解液性（本実施形態では耐アルカリ性）を有していることがより好ましい。耐電解液性を付与するために、端子部材３，５の少なくとも電解液に触れる部分にニッケルめっきを施すことが好ましい。電解液に触れない部分、例えば冷却通路２５を形成する各突条部３ｂ、５ｂには、ニッケルめっきではなく、例えばクロムめっきを施してもよい。   In this embodiment, the positive electrode terminal member 3 and the negative electrode terminal member 5 are formed of nickel-plated steel plates. These terminal members 3 and 5 may be any material as long as they have electrical conductivity such as metal. For example, aluminum can be used. It is more preferable to have (alkaline). In order to impart resistance to the electrolytic solution, it is preferable to perform nickel plating on at least a portion of the terminal members 3 and 5 that contacts the electrolytic solution. Parts that do not come into contact with the electrolyte, for example, the protrusions 3b and 5b that form the cooling passage 25, may be subjected to, for example, chromium plating instead of nickel plating.

また、図２に示すように、枠部材７の、対向方向Ｘの両端部における内周部には、正極端子部材３および負極端子部材５を受けるための凹部７ａ、７ｂが形成されている。したがって、これら凹部７ａ，７ｂに正極端子部材３および負極端子部材５の各端子面部３ａ，５ａが配置された状態で、正極端子部材３および負極端子部材５は、縦方向Ｚおよび横方向Ｙにおいて、枠部材７の内側に位置する。換言すれば、枠部材７の外周部７ｃは、ケーシング９の外周部を形成している。   In addition, as shown in FIG. 2, recesses 7 a and 7 b for receiving the positive electrode terminal member 3 and the negative electrode terminal member 5 are formed on the inner peripheral portions of both ends of the frame member 7 in the facing direction X. Therefore, in a state where the terminal surface portions 3a and 5a of the positive electrode terminal member 3 and the negative electrode terminal member 5 are disposed in the recesses 7a and 7b, the positive electrode terminal member 3 and the negative electrode terminal member 5 are in the vertical direction Z and the horizontal direction Y. , Located inside the frame member 7. In other words, the outer peripheral portion 7 c of the frame member 7 forms the outer peripheral portion of the casing 9.

さらに、各凹部７ａ、７ｂには、枠部材７と各端子部材３，５との間をシールするための各シール部材３１を収容する、対向方向Ｘに凹む収容溝３３が設けられている。各収容溝３３は、図５に示すように、枠部材７の全周に渡って延びている。本実施形態では、この収容溝３３に、シール部材３１として、弾性材料からなる環状のＯリング（図２）が収容されている。このＯリングを構成する材料としては、例えば、エチレン−プロピレンゴム（ＥＰＤＭ）が好ましい。また、Ｏリングのみならず、封止補助剤として、例えばアスファルトピッチを併用することにより、ケーシング９をより確実にシールすることができる。なお、シール部材３１を形成する材料としては、ＥＰＤＭのほかにも、例えば、ネオプレンゴム、ニトリルゴム、フッ素ゴム等のエラストマーを使用することができる。また、封止補助剤としては、アスファルトピッチのほかに、例えば、フッ素系撥水剤を使用することができる。   Further, the recesses 7a and 7b are provided with receiving grooves 33 that are recessed in the facing direction X and that receive the seal members 31 for sealing between the frame member 7 and the terminal members 3 and 5, respectively. As shown in FIG. 5, each housing groove 33 extends over the entire circumference of the frame member 7. In the present embodiment, an annular O-ring (FIG. 2) made of an elastic material is accommodated as the seal member 31 in the accommodation groove 33. As a material constituting this O-ring, for example, ethylene-propylene rubber (EPDM) is preferable. In addition to the O-ring, the casing 9 can be more reliably sealed by using, for example, asphalt pitch together as a sealing aid. In addition to EPDM, for example, an elastomer such as neoprene rubber, nitrile rubber, or fluororubber can be used as a material for forming the seal member 31. In addition to asphalt pitch, for example, a fluorine-based water repellent can be used as the sealing aid.

枠部材７の矩形の開口の４つの角部の各近傍には、対向方向Ｘに貫通する貫通孔３７が設けられている。なお、この貫通孔３７は、後述するように、図１の複数の電池Ｃを連結する連結ボルト１を挿通させるための孔であり、その形状、数および配置は、電池Ｃ同士の連結を行うことが可能な範囲で適宜変更してよい。   In the vicinity of each of the four corners of the rectangular opening of the frame member 7, a through hole 37 penetrating in the facing direction X is provided. As will be described later, the through hole 37 is a hole through which the connecting bolt 1 that connects the plurality of batteries C in FIG. 1 is inserted, and the shape, number, and arrangement thereof connect the batteries C to each other. It may be changed as appropriate within the possible range.

図７に斜視図で示すように、枠部材７における、凹部７ａ（７ｂ）の縦方向Ｚの外側には、それぞれ、対向方向Ｘに凹む連通凹部７ｄ，７ｅが設けられている。さらに、枠部材７の、前記冷却通路２５（図２）の延設方向（この例では縦方向Ｚ）の一端部（この例では連通凹部７ｅ側）には、対向方向Ｘに貫通する開口３９が設けられている。電池Ｃを冷却するための空気は、これら連通凹部７ｄ，７ｅおよび開口３９を介して冷却通路２５に出入りする。なお、図５に示すように、この開口３９の横方向Ｙ（つまり、複数の冷却通路２５の並び方向）の最長部分の両端は、横方向Ｙの両端に位置する冷却通路２５よりも外側に位置するように設定されている。   As shown in a perspective view in FIG. 7, communication recesses 7 d and 7 e that are recessed in the facing direction X are provided on the outer side of the recess 7 a (7 b) in the longitudinal direction Z in the frame member 7. Further, an opening 39 penetrating in the facing direction X is formed at one end (in this example, the communication recess 7e side) of the frame member 7 in the extending direction (in this example, the vertical direction Z) of the cooling passage 25 (FIG. 2). Is provided. Air for cooling the battery C enters and exits the cooling passage 25 through the communication recesses 7 d and 7 e and the opening 39. As shown in FIG. 5, both ends of the longest portion of the opening 39 in the lateral direction Y (that is, the direction in which the plurality of cooling passages 25 are arranged) are located outside the cooling passages 25 located at both ends of the lateral direction Y. It is set to be located.

さらに、枠部材７の一辺（この例では上辺）には、ケーシング９の内部と外部を連通させる連通路を形成する管状の連通管４１が２つ設けられている。本実施形態の例では、２つの連通管４１，４１は、対向方向Ｘにほぼ直交する方向（この例では横方向Ｙ）に互いに異なる位置に配置されている。電池の組立て時には、この連通管４１は注液口として使用される。また、枠部材７の一辺（この例では上辺）上の、対向方向Ｘにほぼ直交する方向（この例では横方向Ｙ）にさらに異なる位置に、ほぼ対向方向Ｘに沿って延設されるケーブル類を拘束するための配線拘束部４３が一体的に形成されている。   Furthermore, two tubular communication pipes 41 are provided on one side (in this example, the upper side) of the frame member 7 to form a communication path for communicating the inside and the outside of the casing 9. In the example of the present embodiment, the two communication pipes 41 and 41 are arranged at different positions in a direction substantially orthogonal to the facing direction X (in this example, the lateral direction Y). When the battery is assembled, the communication pipe 41 is used as a liquid injection port. Further, a cable extending substantially along the facing direction X at a different position on one side (in this example, the upper side) of the frame member 7 in a direction substantially orthogonal to the facing direction X (in this example, the lateral direction Y). A wiring restraint portion 43 for restraining the kind is integrally formed.

枠部材７を形成する素材は、機械的強度、耐熱性、および耐電解液性に優れる絶縁性材料で形成されることが好ましく、本実施形態では、変性ポリフェニレンエーテル（ＰＰＥ）樹脂を使用している。   The material forming the frame member 7 is preferably formed of an insulating material having excellent mechanical strength, heat resistance, and electrolytic solution resistance. In this embodiment, a modified polyphenylene ether (PPE) resin is used. Yes.

次に、図１に示す、単位電池Ｃを用いて構成した電池モジュールＢ全体の構造について説明する。本実施形態における電池モジュールＢにおいて、複数の単位電池Ｃは、隣接する単位電池Ｃの一方の正極端子部材３と、他方電池Ｃの負極端子部材５とが互いに対向するように積層されている。   Next, the overall structure of the battery module B configured using the unit battery C shown in FIG. 1 will be described. In the battery module B in the present embodiment, the plurality of unit batteries C are stacked such that one positive terminal member 3 of the adjacent unit battery C and the negative terminal member 5 of the other battery C face each other.

このように積層された複数の単位電池Ｃは、各単位電池Ｃの枠部材７に設けられた貫通孔３７に、前記連結ボルト１を電池Ｃの積層方向（すなわち対向方向Ｘ）に挿通し、連結ボルト１の先端（この例では両端）に連結ナット２を螺合させて、これら単位電池Ｃを積層方向に締め付けることにより、互いに連結されている。   The plurality of unit batteries C stacked in this way are inserted through the connection bolts 1 in the stacking direction of the batteries C (that is, the facing direction X) through the through holes 37 provided in the frame member 7 of each unit battery C. The connection bolts 1 are connected to each other by screwing the connection nuts 2 to the front ends (both ends in this example) of the connection bolts 1 and tightening the unit cells C in the stacking direction.

このように複数の電池Ｃが積層された状態で、隣接する電池Ｃ，Ｃ間には、上述のように冷却通路２５が形成され、また、冷却通路２５の下方に、積層方向に並ぶ枠部材７の各開口３９によって形成された空間が、冷却通路２５に連通する空気導入路４９を形成している。このように、電池Ｃを構成する部材を利用して冷却通路２５や空気導入路４９を形成することにより、積層される単位電池Ｃ間に冷却空気用通路を別途設けたり、冷却用空気の導入路を確保するための部材を設けたりする必要がないので、電池モジュールＢのさらなる小型化、軽量化を図りつつ、電池モジュールＢの内部を効率的に冷却することができる。   In the state where the plurality of batteries C are stacked in this way, the cooling passage 25 is formed between the adjacent batteries C and C as described above, and a frame member arranged below the cooling passage 25 in the stacking direction. 7 forms an air introduction path 49 communicating with the cooling passage 25. In this way, by forming the cooling passage 25 and the air introduction passage 49 using the members constituting the battery C, a cooling air passage is separately provided between the stacked unit batteries C, or the introduction of the cooling air is performed. Since there is no need to provide a member for securing the path, the inside of the battery module B can be efficiently cooled while further reducing the size and weight of the battery module B.

複数の単位電池Ｃからなる電池積層体の両端には、それぞれ、平板状の導電性材料からなる集電板５１，５１が配置されており、さらにその外側に、絶縁性材料からなる端板５３，５３が配置されている。各集電板５１のほぼ中央位置には、円柱状のモジュール端子体５５が突設されている。モジュール端子体５５は、例えば、円柱状の金属部材を溶接により板状の集電板本体に接合した後、中心部分にタップ加工を施すことにより形成される。一方、端板５３の、モジュール端子体５５に対応する位置には、モジュール端子体５５を挿通させて電池モジュールＢの外部に露出させるための端子挿通孔５７が設けられている。   Current collector plates 51, 51 made of a flat conductive material are respectively arranged at both ends of a battery stack made up of a plurality of unit cells C, and an end plate 53 made of an insulating material is further provided outside thereof. , 53 are arranged. A cylindrical module terminal body 55 projects from the current collecting plate 51 at a substantially central position. The module terminal body 55 is formed, for example, by joining a plate-shaped metal member to a plate-shaped current collector plate body by welding and then tapping the center portion. On the other hand, a terminal insertion hole 57 through which the module terminal body 55 is inserted and exposed to the outside of the battery module B is provided at a position of the end plate 53 corresponding to the module terminal body 55.

また、図８に示すように、端板５３には、電池モジュールＢの内部に冷却用空気を送るための送風機６１と、送風機６１からの空気を前記空気導入路４９に導入する空気導入ダクト６３が設けられている。送風機６１は、端板５３上の端子挿通孔５７のやや下方に設けられて、冷却用空気を下方に送出するように設置されている。空気導入ダクト６３は、送風機６１のやや下方の、空気導入路４９に対応する上下方向位置に設けられており、上方の送風機６１から下向きに送られてきた空気を取り入れて、空気導入路４９へ導入する。   Further, as shown in FIG. 8, the end plate 53 has a blower 61 for sending cooling air into the battery module B, and an air introduction duct 63 for introducing the air from the blower 61 into the air introduction path 49. Is provided. The blower 61 is provided slightly below the terminal insertion hole 57 on the end plate 53 and installed so as to send cooling air downward. The air introduction duct 63 is provided in a vertical position corresponding to the air introduction path 49 slightly below the blower 61, and takes in air sent downward from the upper blower 61 to the air introduction path 49. Introduce.

さらに、図１（ａ）に示すように、各電池Ｃに設けられた２つの連通管４１，４１は、それぞれ、異なる側に隣接する電池Ｃの連通管４１と、可撓性の連通部材である連結管６７を介して順次接続されている。このように構成することにより、例えば、末端の電池Ｃの一方の連通管４１を圧力監視用の圧力計や圧力調整弁等を接続することにより、電池モジュールＢ全体の内圧、すなわち各電池Ｃの内圧の平均値を監視および調整することが可能になる。   Furthermore, as shown to Fig.1 (a), the two communication pipes 41 and 41 provided in each battery C are respectively the communication pipe 41 of the battery C adjacent to a different side, and a flexible communication member. They are sequentially connected through a certain connecting pipe 67. By configuring in this way, for example, by connecting one communication tube 41 of the terminal battery C to a pressure gauge for monitoring pressure, a pressure adjusting valve, or the like, the internal pressure of the entire battery module B, that is, each battery C It becomes possible to monitor and adjust the average value of the internal pressure.

上述のように、極端子部材および負極端子部材５は、それぞれ、単位電池Ｃの正極側端子および負極側端子として機能する。この場合、図１に示すように複数の単位電池Ｃを積層して電池モジュールＢとして使用する際に、隣接する単位電池Ｃの一方の正極端子部材３と他方の負極端子部材５を重ねて接触させることにより、これら２つの単位電池Ｃを直列に接続することができる。したがって、追加の接続部材が不要であり、電池モジュールＢの小型化、軽量化、および組立作業の簡素化が可能となる。   As described above, the electrode terminal member and the negative electrode terminal member 5 function as the positive electrode side terminal and the negative electrode side terminal of the unit battery C, respectively. In this case, when a plurality of unit batteries C are stacked and used as a battery module B as shown in FIG. 1, one positive terminal member 3 and the other negative terminal member 5 of the adjacent unit batteries C are overlapped and contacted. By doing so, these two unit batteries C can be connected in series. Therefore, an additional connection member is unnecessary, and the battery module B can be reduced in size and weight, and the assembly work can be simplified.

上記で説明した実施形態に係る電池Ｃによれば、正極端子部材３及び負極端子部材５と枠部材７との間にシール部材３１を設けているので、各単位電池Ｃの枠部材７に設けられた貫通孔３７に挿通された、連結ボルト１のような長尺の連結部材のみによって電池モジュールＢを構成することが可能になり、電池Ｃの密閉性確保のための締め付け用部材を追加する必要がない。また、単位電池Ｃのケーシング９の外周部が絶縁性材料によって形成されているので、さらなる絶縁用部材で覆う必要がない。したがって、電池モジュールＢが大幅に小型化、軽量化できる。さらに、使用される機器の設置スペースや出力電圧に適合させるために、電池モジュールＢにおける単位電池Ｃの積層数を変更する場合、連結部材の長さ寸法のみを変更すればよいので、多様な機器に対して柔軟に仕様変更することが可能となる。   According to the battery C according to the embodiment described above, since the seal member 31 is provided between the positive electrode terminal member 3 and the negative electrode terminal member 5 and the frame member 7, the seal member 31 is provided on the frame member 7 of each unit battery C. The battery module B can be configured only by a long connecting member such as the connecting bolt 1 inserted through the formed through-hole 37, and a fastening member for securing the sealing property of the battery C is added. There is no need. Moreover, since the outer peripheral part of the casing 9 of the unit cell C is formed of an insulating material, there is no need to cover it with a further insulating member. Therefore, the battery module B can be significantly reduced in size and weight. Furthermore, when changing the number of unit batteries C stacked in the battery module B in order to adapt to the installation space and output voltage of the equipment used, it is only necessary to change the length dimension of the connecting member. The specification can be flexibly changed.

なお、本実施形態においては、単位電池Ｃをニッケル水素二次電池として構成したが、本発明は、これに限らず、各種一次電池および二次電池、例えば、ニッケルカドミウム電池やリチウムイオン電池などに適用することが可能である。また、ケーシング９の形状は角形に限らず、例えば円筒形状であっても本発明を適用することができる。   In the present embodiment, the unit battery C is configured as a nickel hydride secondary battery. However, the present invention is not limited to this, and various primary batteries and secondary batteries such as a nickel cadmium battery and a lithium ion battery are used. It is possible to apply. In addition, the shape of the casing 9 is not limited to a square shape, and the present invention can be applied to a cylindrical shape, for example.

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.

１ 連結ボルト（連結部材）
２ 連結ナット
３ 正極端子部材
３ａ 正極端子面部
３ｂ 正極側突条部
５ 負極端子部材
５ａ 負極端子面部
５ｂ 負極側突条部
７ 枠部材
９ ケーシング
１３ 正極
１５ 負極
１７ 電極体
１９ 第１セパレータ
２１ 第２セパレータ
２５ 冷却通路
３１ シール部材
３７ 貫通孔
４９ 空気導入通路
Ｃ 電池
Ｘ 正極端子部材と負極端子部材の対向方向
Ｙ 電池の横方向
Ｚ 電池の縦方向 1 Connection bolt (connection member)
2 connecting nut 3 positive electrode terminal member 3a positive electrode terminal surface portion 3b positive electrode side protrusion 5 negative electrode terminal member 5a negative electrode terminal surface portion 5b negative electrode side protrusion 7 frame member 9 casing 13 positive electrode 15 negative electrode 17 electrode body 19 first separator 21 second Separator 25 Cooling passage 31 Sealing member 37 Through hole 49 Air introduction passage C Battery X Opposite direction of positive electrode terminal member and negative electrode terminal member Y Horizontal direction of battery Z Vertical direction of battery

Claims (7)

複数の電池を積層してなる積層型電池モジュールを構成する電池であって、セパレータを介して互いに対向する正極および負極を含む電極体を電解液とともに収納するケーシングを備えており、
当該ケーシングが、
導電性の板材から形成され、電池の外部に露出する部分が正極端子として機能し、電池の内部に向く面が正極集電面として機能する正極端子部材と、
導電性の板材から形成され、前記正極端子部材に対向して配置されて、電池の外部に露出する部分が負極端子として機能し、電池の内部に向く面が負極集電面として機能する負極端子部材と、
前記正極端子部材および負極端子部材の間に介在し、かつ当該ケーシングの外周部を形成する、絶縁性材料からなる枠部材と、
前記枠部材と前記正極端子部材との間、および前記枠部材と前記負極端子部材との間にそれぞれ介在するシール部材と、
を有しており、
前記枠部材の外周部に、前記正極端子部材と負極端子部材とが対向する方向である対向方向に貫通する貫通孔が複数設けられている、
積層型電池モジュール用電池。 A battery that constitutes a stacked battery module in which a plurality of batteries are stacked, and includes a casing that houses an electrode body including a positive electrode and a negative electrode facing each other via a separator together with an electrolytic solution,
The casing is
A positive electrode terminal member formed of a conductive plate, a portion exposed to the outside of the battery functions as a positive electrode terminal, and a surface facing the inside of the battery functions as a positive electrode current collecting surface;
Is formed of a conductive plate, the disposed to face the positive electrode terminal member, the portion exposed to the outside of the battery acts as a negative terminal, functions as a negative electrode current collector surface is a surface facing the inside of the battery A negative electrode terminal member,
A frame member made of an insulating material interposed between the positive electrode terminal member and the negative electrode terminal member and forming the outer peripheral portion of the casing;
Seal members interposed between the frame member and the positive electrode terminal member and between the frame member and the negative electrode terminal member,
Have
In the outer periphery of the frame member, there are provided a plurality of through-holes that penetrate in the facing direction , which is the direction in which the positive electrode terminal member and the negative electrode terminal member face each other.
Batteries for stacked battery modules. 請求項１において、前記正極端子部材が、平板状の正極端子面部と、この正極端子面部に突設された、互いに平行に延びる複数の正極側突条部とを有しており、前記負極端子部材が、平板状の負極端子面部と、この負極端子面部に突設された、互いに平行に延びる複数の負極側突条部とを有している積層型電池モジュール用電池。 2. The positive electrode terminal member according to claim 1, wherein the positive electrode terminal member has a flat positive electrode terminal surface portion and a plurality of positive electrode side protrusions protruding from the positive electrode terminal surface portion and extending in parallel with each other, and the negative electrode terminal A battery for a stacked battery module, wherein the member includes a flat negative electrode terminal surface portion and a plurality of negative electrode side protrusions protruding from the negative electrode terminal surface portion and extending in parallel with each other. 請求項２において、前記枠部材の、前記正極側突条部および前記負極側突条部の延設方向における一端部に、前記対向方向に貫通する開口が設けられている積層型電池モジュール用電池。 3. The battery for a stacked battery module according to claim 2, wherein an opening penetrating in the opposite direction is provided at one end of the frame member in the extending direction of the positive electrode-side protrusion and the negative electrode-side protrusion. . 請求項１から３のいずれか一項において、前記電極体が、前記セパレータを介して互いに対向するシート状の前記正極と前記負極とを捲回してなる円筒形状を有して、その軸心方向が前記対向方向に沿うように配置されており、前記電極体の軸心方向の一端部から前記正極が突出して前記正極集電面に接触し、前記電極体の軸心方向の他端部から前記負極が突出して前記負極集電面に接触している積層型電池モジュール用電池。   4. The electrode body according to claim 1, wherein the electrode body has a cylindrical shape formed by winding the sheet-like positive electrode and the negative electrode facing each other with the separator interposed therebetween, and the axial direction thereof. Are arranged along the opposite direction, the positive electrode protrudes from one end of the electrode body in the axial center direction, contacts the positive electrode current collecting surface, and from the other end of the electrode body in the axial center direction A battery for a stacked battery module, wherein the negative electrode protrudes and is in contact with the negative electrode current collector surface. 請求項１から４のいずれか一項に記載の電池を単位電池として、複数の該単位電池を、隣接し合う単位電池の一方の前記正極端子部材と他方の前記負極端子部材とが対向する方向に積層してなる積層型電池モジュールであって、
積層された複数の単位電池の各々に設けられた前記貫通孔に積層方向に挿通された連結部材によって複数の前記単位電池が連結されている、
積層型電池モジュール。 5. A direction in which one of the positive electrode terminal members and the other negative electrode terminal member of an adjacent unit battery are opposed to each other by using the battery according to claim 1 as a unit battery. A laminated battery module laminated on
The plurality of unit cells are connected by a connecting member inserted in the stacking direction into the through-hole provided in each of the stacked unit cells.
Multilayer battery module. 請求項５において、各単位電池は、請求項２に記載の正極端子部材および負極端子部材を有しており、隣接する一方の単位電池の前記正極端子面部および前記正極側突条部と、他方の単位電池の前記負極端子面部および前記負極側突条部とによって冷却空気を通過させる冷却通路が形成されている積層型電池モジュール。 In Claim 5, each unit battery has the positive electrode terminal member and negative electrode terminal member of Claim 2, and the positive electrode terminal surface part of one adjacent unit battery, the positive electrode side protrusion part, and the other A laminated battery module in which a cooling passage through which cooling air passes is formed by the negative electrode terminal surface portion and the negative electrode side protrusion of the unit battery. 請求項６において、各単位電池の前記枠部材には、請求項３に記載の開口が設けられており、積層方向に並ぶ各開口によって形成された空間が、前記冷却通路に連通する空気導入路を形成している積層型電池モジュール。 7. The air introduction path according to claim 6, wherein the frame member of each unit battery is provided with the opening according to claim 3, and a space formed by the openings arranged in the stacking direction communicates with the cooling passage. A laminated battery module that forms
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