JP4404982B2

JP4404982B2 - Collective sealed secondary battery

Info

Publication number: JP4404982B2
Application number: JP05561199A
Authority: JP
Inventors: 貢高木; 真介福田; 真一湯浅; 真治浜田
Original assignee: Panasonic Corp; Toyota Motor Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Toyota Motor Corp; Panasonic Holdings Corp
Priority date: 1999-03-03
Filing date: 1999-03-03
Publication date: 2010-01-27
Anticipated expiration: 2019-03-03
Also published as: JP2000251950A

Description

【０００１】
【発明の属する技術分野】
本発明は、単電池を複数個直列配置して一体電槽としてなる集合型密閉二次電池に関するものである。
【０００２】
【従来の技術】
この種の集合型密閉二次電池としては、特開平７−８５８４７号公報に開示されたものが知られている。その集合型密閉二次電池６１は、図１１に示すように、有底矩形筒形状に形成された電槽６３内に発電要素を収容し、電槽６３の開口部を蓋体６４により封止してなる単電池６２を複数個直列配置し、これら単電池６２の電槽６３を端板６５及び拘束バンド６６にて緊締状態で連結し、また各単電池６２の正極端子６７及び負極端子６８を蓋体６４を貫通させて上方に突出させ、これら端子６７、６８を電気接続バー６９で順次直列に接続した構造となっている。
【０００３】
また、特開平６−２１５８０４号公報には、プラスチック製の電槽と蓋体を熱溶着したモノブロック蓄電池において、その電槽の２つの対向する側壁の外面にそれぞれ内側に凹入空間を形成した側板を熱溶着して電槽の側壁と側板との間に冷却ジャケット部を構成し、側板の両端部の上部に冷却液体の入口オリフィスと出口オリフィスを設けたものが開示されている。
【０００４】
また、特開昭６１−４５５７１号公報には、モノブロック電槽のセル間の隔壁に上下に貫通する冷却通路を設けるとともにその上下に冷却媒体を流入・排出用のヘッダを設け、各セル毎に分離された蓋体を設けたものが開示されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、特開平７−８５８４７号公報の集合型密閉二次電池では、各単電池が密接配置されて緊締されているので、周囲温度が高い場合や大電流で充放電した場合に各単電池からの放熱が十分に行われず、電池温度が上昇して電池寿命が低下するという問題がある。
【０００６】
これに対して、特開平６−２１５８０４号公報の蓄電池では、電槽の両側面が水冷ジャケット部で冷却されるため、ある程度温度上昇を抑制できるが、図１１のように単電池を集合した二次電池では、特に単電池間を冷却できないために、単電池の温度上昇を十分に抑制できないという問題がある。
【０００７】
一方、特開昭６１−４５５７１号公報の蓄電池では、モノブロック電槽におけるセル間の隔壁における上下の冷却通路を形成した部分は強制冷却されるが、各セルの外側面の全体を強制冷却するものでないために冷却効果が十分でなく、また電槽の構造が複雑であるために製造コストが高くなり、またセル毎に蓋体を設ける必要があって、組立工数が多くなってコスト高になる等の問題がある。
【０００８】
本発明は、上記従来の問題点に鑑み、安価な構成で各単電池を効果的に冷却できる集合型密閉二次電池を提供することを目的としている。
【０００９】
【課題を解決するための手段】
本発明の集合型密閉二次電池は、有底矩形筒形状の電槽内に発電要素を収容してその開口部を封止して成る単電池を複数個直列配置した集合型密閉二次電池において、冷却媒体通路を各単電池の電槽間と単電池の配置方向に対してその両側とにこれらを連通させて形成したものであり、これら冷却媒体通路を通る冷却媒体にて単電池間を含めて単電池のすべての側面を冷却媒体にて強制冷却できるため、すべての単電池を効果的に冷却することができる。
【００１０】
また、冷却媒体通路を、集合型密閉二次電池の両端の単電池の外側にも設けると、両端の単電池の外側面も強制冷却できる。
【００１１】
また、集合型密閉二次電池の単電池の配置方向に対してその両側及び／または単電池の配置方向の両端に、冷却ジャケット部材を接合すると、上記冷却媒体通路をコンパクトな冷却ジャケット部材にて容易にかつ軽量に構成できる。
【００１２】
また、各単電池の電槽の互いに対向する対向壁面の少なくとも一方に突設した突部を設け、対向壁面間に冷却媒体通路を形成すると、各単電池の電槽の対向壁面に突部を形成するだけで、単電池の対向壁面間の略全面にわたる冷却媒体通路を簡単かつ安価に形成することができる。
【００１３】
また、冷却媒体が単電池配列方向両側の冷却媒体通路の全面を通って流動するようにその冷却媒体通路に整流突条を設けると、全体を確実かつ均等に冷却することができ、高い冷却性能を確保できる。
【００１４】
また、各単電池を相互に一体接合するとともに開口部を一体型の蓋体にて封止すると、少ない部品数と組立工数にて一体電槽とした集合型密閉二次電池を得ることができる。
【００１５】
また、単電池の電槽及び蓋体が、又は単電池の電槽、蓋体及び冷却ジャケット部材が、それぞれ合成樹脂製で溶着にて相互に接合されて一体化されていると、単電池を集合した二次電池を容易に一体電槽としたものを得ることができる。
【００１６】
また、単電池配列方向両側の冷却媒体通路に対して冷却媒体を供給、排出する冷却媒体の入口オリフィスと出口オリフィスを単電池配置方向の両端に配設するとともに分配ヘッダを介して両側の冷却媒体通路に接続すると、単一の入口オリフィスと出口オリフィスから冷却媒体を供給、排出することができ、二次電池の冷却用配管を簡略にできる。
【００１７】
また、２つの単電池の電槽ごとにそれらの間に冷却媒体通路を形成すると、同じ全長で１つの冷却媒体通路の流路断面積を大きくできて、冷却媒体通路における圧力損失を小さくすることができる。
【００１８】
【発明の実施の形態】
以下、本発明の集合型密閉二次電池の一実施形態について、図１〜図７を参照して説明する。
【００１９】
本実施形態の集合型密閉二次電池１は、電気自動車用の駆動電源として好適に用いることができるニッケル・水素二次電池であり、図１〜図３に示すように、単電池２を複数個直列配置して相互に接合して一体電槽とし、単電池列の両端に端板６を接合し、単電池２及び端板６の配列方向に対してその両側に内側に扁平な空間を凹入形成した板状の冷却ジャケット部材３を接合し、その上に単一体の蓋体５を接合して各単電池２及び端板６を密閉し、端板６、６間を拘束バンド７にて緊締して構成されている。８は一端と他端の単電池２から上方に突出された正極端子や負極端子が貫通するように蓋体５に形成された端子装着穴、９は各単電池２に対応して蓋体５に貫通形成された安全弁装着穴である。１０、１１は冷却媒体の入口オリフィスと出口オリフィスであり、蓋体５の両端部に一体的に装着される。上記単電池２、冷却ジャケット部材３、蓋体５、端板６、入口オリフィス１０、出口オリフィス１１等は、ＰＰ／ＰＰＥアロイなどの合成樹脂にて構成され、溶着によって相互に一体接合されている。また、隣接する単電池２、２は、図２、図３に示すように、接続体１２にて電気的に接続されている。
【００２０】
以下、詳細に説明すると、単電池２は、図２、図３に示すように、有底矩形筒形状の電槽１４内に発電要素１５を収容して成り、各単電池２を直列に配列した状態で互いに対向する電槽１４の対向壁面１６に、相互に当接する多数の突部１７がマトリックス状に突設され、これら突部１７にて両対向壁面１６、１６間に形成された空間にて冷却媒体通路１８が構成されている。なお、単電池列の両端の単電池２の外側の対向壁面１６には端板６が当てられて接合され、その端板６と対向壁面１６との間にも冷却媒体通路１８が形成されている。この端板６は冷却ジャケット部材にて構成してもよい。また、適当箇所の複数（図示例では４箇所）の突部１７は大径に形成され、その端面に互いに嵌入係合する係合突起１９ａと係合凹部１９ｂが形成されて電槽１４相互の位置決めがなされている。また、電槽１４の上端から適当距離下方位置と下端縁部には互いに当接する接合縁部２０が突設されている。そして、単電池２を直列に配列した状態で互いに当接している突部１７及び接合縁部２０を相互に溶着することによって各単電池２が一体電槽として一体接合されている。
【００２１】
この単電池２の配列方向に対してその両側における単電池２と冷却ジャケット部材３の内側面との間に形成された空間にて、両側の冷却媒体通路２１が構成されている。また、上記端板６の上縁には両側の冷却媒体通路２１に連通して冷却媒体（水）を分配する分配ヘッダ形成樋２２が形成されている。
【００２２】
一体電槽とされた各単電池２の電槽１４における上方の接合縁部２０より上部の上部枠２６には、図２、図３及び図４に示すように、隣接する単電池２を電気的に接続する接続体１２を配置する略三角形状の切欠１３が千鳥状に形成されており、接続体１２は切欠１３に配置された状態で電槽１４及び蓋体５に密封状態で一体接合されている。
【００２３】
接続体１２は、図２、図３及び図５に示すように、金属（ニッケル等）製の接続軸２７と合成樹脂製の支持体２８にて構成され、接続軸２７が支持体２８の保持筒部２９に圧入状態で貫通されるとともに、接続軸２７の鍔部２７ａと保持筒部２９内周との間に介装したＯリング３１にて完全に密封されている。また、支持体２８には保持筒部２９から一対の三角形状の翼部３０が突設され、この接続体１２を切欠１３に配置したときそれぞれ個別枠２６に接合されるように構成されている。
【００２４】
蓋体５は、図２、図３及び図６に示すように、内面に各電槽１４の上部枠２６に対応するように個別枠３２が形成されるとともに、外周部に断面倒立Ｌ字状に外周枠３３が垂下され、長手方向両端部には分配ヘッダ形成樋２２の上端に接合されて分配ヘッダ３５を密閉形成する密封突条３４が突設されている。
【００２５】
また、蓋体５の両端部の一側部には端子装着穴８が形成され、他側部には入口オリフィス１０と出口オリフィス１１を接合する接合突条３６が突設されている。これらオリフィス１０、１１は、平面形状が略Ｊ字状で下面開放のＪ字ボックス片３７の短辺の先端から接続口３８を突出させて構成されている。また、蓋体５のＪ字ボックス片３７の長辺先端部に対向する部分に分配ヘッダ３５に連通する連通開口３９が形成されている。
【００２６】
また、冷却ジャケット部材３の内側面には、図７（ａ）に示すように、冷却媒体通路２１の全面を冷却媒体が均等に流れるように、上下に蛇行する蛇行流通路４０を形成する整流突条４１が突設されている。この整流突条４１に代えて、図７（ｂ）に示すように、上下方向に適当間隔置きに上部で短く、下部で長い水平方向の複数の整流突条４２を設けてもよい。なお、図７（ｃ）に示すように、これら整流突条４１、４２は必ずしも設けなくてもよいが、その場合冷却媒体通路２１の両側下部に冷却媒体の滞留域４３が発生して配列方向両端部の単電池２の下部の冷却が十分行われない恐れがあるため、整流突条４１、４２を設けることが望ましい。なお、これら整流突条４１、４２は単電池２の電槽１４側に設けてもよい。
【００２７】
以上の構成の集合型密閉二次電池１においては、入口オリフィス１０から冷却媒体を供給すると、分配ヘッダ３５を通って両側の冷却媒体通路２１に流入し、この冷却媒体通路２１内を下流側に向かって流れるとともに、単電池２間の冷却媒体通路１８を通って両側の冷却媒体通路２１、２１間でも流通し、単電池２の電槽１４の対向壁面１６を含めてすべての側面が冷却媒体にて強制冷却され、冷却媒体はその後出口オリフィス１１から排出される。したがって、すべての単電池２の四周側面が冷却媒体にて効果的に冷却される。
【００２８】
また、各単電池２を溶着して相互に一体接合して一体電槽とするとともにその開口部に一体型の蓋体５を溶着して封止しているので、少ない部品数と組立工数にて一体電槽とした集合型密閉二次電池１を得ることができ、また各単電池２の電槽１４の対向壁面１６に突部１７を形成して突部１７を当接させて相互に溶着しているので簡単かつ安価に対向壁面１６、１６間の略全面にわたる冷却媒体通路１８を形成することができる。
【００２９】
また、単電池列の両側にコンパクトな板状の冷却ジャケット部材３を接合して両側の冷却媒体通路２１を構成しているので軽量に構成することができる。
【００３０】
また、両側の冷却媒体通路２１に対して冷却媒体を供給、排出する冷却媒体の入口オリフィス１０と出口オリフィス１１を単電池配置方向の両端に配設するとともに分配ヘッダ３５を介して両側の冷却媒体通路２１に接続しているので、単一の冷却媒体経路にて上記構成と相まってすべての単電池２の全周を効果的に冷却することができる。
【００３１】
なお、以上の実施形態の説明では、図８（ａ）に示すように、各単電池２、２間に冷却媒体通路１８を配設した例を示したが、図８（ｂ）に示すように、２つの単電池２毎にそれらの間に冷却媒体通路１８を形成するようにしても良く、そうすると二次電池１の全長Ｌは同じにしたままで、冷却媒体通路１８の幅をｔから２ｔにでき、流路断面積を大きくすることができるため、この冷却媒体通路１８における圧力損失を小さくすることができる。
【００３２】
また、以上の実施形態の説明では、入口オリフィス１０と出口オリフィス１１を単電池２の配設方向と直交する方向の一側に配設した例を示したが、図９に示すように、入口オリフィス１０と出口オリフィス１１を対角位置に配設して冷却媒体を単電池２、２間の冷却媒体通路１８に流すようにしてもよい。図９（ａ）の例では、両側の冷却媒体通路２１と単電池間の冷却媒体通路１８にて蛇行状の通路を形成している。また、図９（ｂ）の例では一側の冷却媒体通路２１の一端に入口オリフィス１０を他側の冷却媒体通路２１の他端に出口オリフィス１１を設けることによって各冷却媒体通路１８に冷却媒体を流すようにしている。
【００３３】
また、上記実施形態では蓋体５が端板６上に被さり、入口オリフィス１０及び出口オリフィス１１が蓋体５に設けられた例を示したが、図１０に示すように、蓋体５は単電池２群上のみを覆い、両端の端板６の上端部に分配ヘッダ部５２を一体的に設け、その上面に入口オリフィス１０や出口オリフィス１１を突設し、冷却ジャケット部材３の両端の上端部に内部の冷却媒体通路２１を分配ヘッダ部５２の両端に対して接続する接続部５３を屈曲形成してもよい。なお、図１０中で斜線で示した部分は、単電池２の集合体と冷却ジャケット部材３の溶着部５４である。
【００３４】
本実施形態においても基本的に上記実施形態と同様の作用効果が得られる。
【００３５】
また、上記実施形態では各構成部材を溶着によって一体接合する例を示したが、接着材にて一体接合してもよい。
【００３６】
【発明の効果】
本発明の集合型密閉二次電池によれば、以上の説明から明らかなように、冷却媒体通路を各単電池の電槽間と単電池の配置方向に対してその両側とにこれらを連通させて形成したものであり、これら冷却媒体通路を通る冷却媒体にて単電池間を含めて単電池のすべての側面を冷却媒体にて強制冷却できるため、すべての単電池を効果的に冷却することができる。
【００３７】
また、冷却媒体通路を、集合型密閉二次電池の両端の単電池の外側にも設けると、両端の単電池の外側面も強制冷却できる。
【００３８】
また、集合型密閉二次電池の単電池の配置方向に対してその両側及び／または単電池の配置方向の両端に、冷却ジャケット部材を接合すると、上記冷却媒体通路を冷却ジャケット部材にて容易かつ軽量に形成できる。
【００３９】
また、各単電池の電槽の互いに対向する両壁面の少なくとも一方に突設した突部を設け、両壁面間に冷却媒体通路を形成すると、各単電池の電槽の対向壁面に突部を形成するだけで、単電池の対向壁面間の略全面にわたる冷却媒体通路を簡単かつ安価に形成することができる。
【００４０】
また、冷却媒体が両側の冷却媒体通路の全面を通って流動するようにその冷却媒体通路に整流用突条を設けると、全体を確実かつ均等に冷却することができ、高い冷却性能を確保できる。
【００４１】
また、各単電池を相互に一体接合するとともに開口部を一体型の蓋体にて封止すると、少ない部品数と組立工数にて一体電槽とした集合型密閉二次電池を得ることができる。
【００４２】
また、単電池の電槽及び蓋体が、又は単電池の電槽、蓋体及び冷却ジャケット部材が、それぞれ合成樹脂製で溶着にて交互に接合されて一体化されていると、単電池を集合した二次電池を容易に一体電槽としたものを得ることができる。
【００４３】
また、両側の冷却媒体通路に対して冷却媒体を供給、排出する冷却媒体の入口オリフィスと出口オリフィスを単電池配置方向の両端に配設するとともに分配ヘッダを介して両側の冷却媒体通路に接続すると、単一の入口オリフィスと出口オリフィスから冷却媒体を供給、排出することができ、二次電池の冷却用配管を簡略にできる。
【００４４】
また、２つの単電池の電槽ごとにそれらの間に冷却媒体通路を形成すると、同じ全長で１つの冷却媒体通路の流路断面積を大きくできて、冷却媒体通路における圧力損失を小さくすることができる。
【図面の簡単な説明】
【図１】本発明の集合型密閉二次電池の一実施形態の外観斜視図である。
【図２】同実施形態の縦断側面図である。
【図３】同実施形態の部分縦断正面図である。
【図４】同実施形態の中間蓋の部分斜視図である。
【図５】同実施形態の電気接続体の斜視図である。
【図６】同実施形態の蓋体の斜視図である。
【図７】同実施形態の両側の冷却媒体通路内の各種構成例を示す縦断面図である。
【図８】同実施形態における冷却媒体通路の配設状態とその変形例を示す概略横断平面図である。
【図９】同実施形態における他の冷却媒体の流れを形成する流路構成例の概略横断平面図である。
【図１０】本発明の集合型密閉二次電池の他の実施形態の分解斜視図である。
【図１１】従来例の集合型密閉二次電池の正面図である。
【符号の説明】
１集合型密閉二次電池
２単電池
３冷却ジャケット部材
５蓋体
１０入口オリフィス
１１出口オリフィス
１４電槽
１５発電要素
１６対向壁面
１７突部
１８冷却媒体通路
２１両側の冷却媒体通路
３５分配ヘッダ
４１整流突条
４２整流突条[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a collective sealed secondary battery in which a plurality of single cells are arranged in series to form an integrated battery case.
[0002]
[Prior art]
As this type of collective sealed secondary battery, a battery disclosed in Japanese Patent Laid-Open No. 7-85847 is known. As shown in FIG. 11, the collective sealed secondary battery 61 houses a power generation element in a battery case 63 formed in a bottomed rectangular cylindrical shape, and the opening of the battery case 63 is sealed with a lid 64. A plurality of the unit cells 62 are arranged in series, and the battery case 63 of the unit cells 62 is connected in a tightened state by the end plate 65 and the restraining band 66, and the positive terminal 67 and the negative terminal 68 of each unit cell 62 are connected. And the terminals 67 and 68 are sequentially connected in series by an electric connection bar 69.
[0003]
Japanese Patent Laid-Open No. 6-215804 discloses a monoblock storage battery in which a plastic battery case and a lid are heat-welded, and indented spaces are formed on the outer surfaces of two opposite side walls of the battery case, respectively. A side plate is thermally welded to form a cooling jacket portion between the side wall and the side plate of the battery case, and an inlet orifice and an outlet orifice for the cooling liquid are provided at the upper portions of both end portions of the side plate.
[0004]
Japanese Patent Application Laid-Open No. 61-45571 provides a cooling passage penetrating vertically in a partition between cells of a monoblock battery case, and a header for inflow / discharge of a cooling medium above and below the cooling passage. The thing which provided the cover body isolate | separated by this is disclosed.
[0005]
[Problems to be solved by the invention]
However, in the collective sealed secondary battery disclosed in Japanese Patent Application Laid-Open No. 7-85847, each single battery is closely arranged and tightened. Therefore, when the ambient temperature is high or when charging / discharging with a large current, Is not sufficiently dissipated, and there is a problem that the battery temperature rises and the battery life decreases.
[0006]
On the other hand, in the storage battery disclosed in Japanese Patent Laid-Open No. 6-215804, since both side surfaces of the battery case are cooled by the water cooling jacket portion, the temperature rise can be suppressed to some extent. In the secondary battery, there is a problem that the rise in the temperature of the single cells cannot be sufficiently suppressed because the space between the single cells cannot be cooled.
[0007]
On the other hand, in the storage battery disclosed in Japanese Patent Application Laid-Open No. 61-45571, the upper and lower cooling passages in the partition between the cells in the monoblock battery case are forcibly cooled, but the entire outer surface of each cell is forcibly cooled. Because it is not a thing, the cooling effect is not enough, and the structure of the battery case is complicated, so the manufacturing cost is high, and it is necessary to provide a lid for each cell, which increases the number of assembly steps and increases the cost. There are problems such as.
[0008]
In view of the above-described conventional problems, an object of the present invention is to provide a collective sealed secondary battery that can effectively cool each single battery with an inexpensive configuration.
[0009]
[Means for Solving the Problems]
The collective sealed secondary battery of the present invention is a collective sealed secondary battery in which a plurality of single cells formed by housing a power generation element in a bottomed rectangular cylindrical battery case and sealing the opening are arranged in series. The cooling medium passages are formed by communicating them between the battery case of each unit cell and both sides of the unit cell with respect to the arrangement direction of the unit cells, and between the unit cells by the cooling medium passing through these cooling medium passages. Since all the side surfaces of the unit cell including can be forcibly cooled by the cooling medium, all the unit cells can be effectively cooled.
[0010]
Further, if the cooling medium passage is provided also outside the unit cells at both ends of the collective sealed secondary battery, the outer surfaces of the unit cells at both ends can be forcibly cooled.
[0011]
In addition, when the cooling jacket member is joined to both sides of the collective sealed secondary battery unit cell and / or both ends of the unit cell arrangement direction, the cooling medium passage is formed by a compact cooling jacket member. It can be configured easily and lightweight.
[0012]
In addition, when a protruding portion is provided on at least one of the opposing wall surfaces of each battery cell facing each other and a cooling medium passage is formed between the opposing wall surfaces, the protruding portion is provided on the opposite wall surface of each cell battery case. By merely forming the cooling medium passage, it is possible to easily and inexpensively form a cooling medium passage over substantially the entire surface between the opposing wall surfaces of the unit cell.
[0013]
In addition, if the cooling medium passage is provided with rectifying ridges so that the cooling medium flows through the entire surface of the cooling medium passage on both sides of the unit cell arrangement direction, the entire cooling medium can be reliably and evenly cooled, and high cooling performance Can be secured.
[0014]
Further, when the unit cells are integrally joined to each other and the opening is sealed with an integrated lid, a collective sealed secondary battery having an integrated battery case can be obtained with a small number of parts and assembly man-hours. .
[0015]
In addition, when the battery case and lid of the unit cell, or the battery case, lid and cooling jacket member of the unit cell are made of synthetic resin and joined together by welding, the unit cell An assembled battery can be easily obtained as an integrated battery case.
[0016]
In addition, an inlet orifice and an outlet orifice of the cooling medium to be supplied to and discharged from the cooling medium passages on both sides in the unit cell arrangement direction are arranged at both ends in the unit cell arrangement direction, and the cooling medium on both sides is provided via the distribution header. When connected to the passage, the cooling medium can be supplied and discharged from a single inlet orifice and outlet orifice, and the piping for cooling the secondary battery can be simplified.
[0017]
In addition, if a cooling medium passage is formed between the two battery cells, the cross-sectional area of one cooling medium passage can be increased with the same overall length, and the pressure loss in the cooling medium passage can be reduced. Can do.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the collective sealed secondary battery of the present invention will be described with reference to FIGS.
[0019]
The collective sealed secondary battery 1 of the present embodiment is a nickel-hydrogen secondary battery that can be suitably used as a drive power source for an electric vehicle. As shown in FIGS. They are arranged in series and joined together to form an integrated battery case, end plates 6 are joined to both ends of the unit cell row, and flat spaces are formed on both sides of the unit cells 2 and end plates 6 with respect to the arrangement direction. A plate-shaped cooling jacket member 3 formed in a recess is joined, a single lid body 5 is joined thereon, each cell 2 and the end plate 6 are sealed, and a restraint band 7 is provided between the end plates 6 and 6. The structure is tightened. Reference numeral 8 denotes a terminal mounting hole formed in the lid body 5 so that a positive electrode terminal or a negative electrode terminal protruding upward from the unit cell 2 at one end and the other end penetrates, and 9 denotes a lid body 5 corresponding to each unit cell 2. It is a safety valve mounting hole formed in the through hole. Reference numerals 10 and 11 denote an inlet orifice and an outlet orifice for the cooling medium, which are integrally attached to both ends of the lid 5. The unit cell 2, the cooling jacket member 3, the lid 5, the end plate 6, the inlet orifice 10, the outlet orifice 11 and the like are made of synthetic resin such as PP / PPE alloy and are integrally joined to each other by welding. . Moreover, the adjacent unit cells 2 and 2 are electrically connected by the connection body 12, as shown in FIG. 2, FIG.
[0020]
Hereinafter, in detail, as shown in FIGS. 2 and 3, the unit cell 2 is configured by housing a power generation element 15 in a bottomed rectangular cylindrical battery case 14, and arranging the unit cells 2 in series. In this state, a large number of protrusions 17 that are in contact with each other are formed in a matrix on the opposing wall surface 16 of the battery case 14 facing each other, and a space formed between the opposing wall surfaces 16 and 16 by these protrusions 17. A cooling medium passage 18 is formed by the above. An end plate 6 is applied to and joined to the opposing wall surface 16 outside the unit cells 2 at both ends of the unit cell array, and a cooling medium passage 18 is also formed between the end plate 6 and the opposing wall surface 16. Yes. The end plate 6 may be constituted by a cooling jacket member. In addition, a plurality of (17 in the illustrated example) projections 17 at appropriate locations are formed with a large diameter, and engagement projections 19a and engagement recesses 19b that are fitted and engaged with each other are formed on the end surfaces of the projections 17 to each other. Positioning has been made. Further, a joining edge portion 20 that protrudes from the upper end of the battery case 14 at an appropriate distance below and the lower end edge protrudes from each other. Then, the unit cells 2 are integrally joined as an integrated battery case by welding the protrusions 17 and the joining edge portions 20 that are in contact with each other in a state where the unit cells 2 are arranged in series.
[0021]
The cooling medium passages 21 on both sides are formed in a space formed between the unit cells 2 and the inner side surface of the cooling jacket member 3 on both sides of the unit cells 2 in the arrangement direction. Further, a distribution header forming rod 22 for distributing the cooling medium (water) is formed on the upper edge of the end plate 6 so as to communicate with the cooling medium passages 21 on both sides.
[0022]
As shown in FIGS. 2, 3, and 4, adjacent unit cells 2 are electrically connected to the upper frame 26 above the joint edge 20 above the battery case 14 of each unit cell 2 that is an integrated battery case. The substantially triangular cutouts 13 for arranging the connection bodies 12 to be connected to each other are formed in a staggered manner, and the connection bodies 12 are integrally joined to the battery case 14 and the lid body 5 in a sealed state while being arranged in the cutouts 13. Has been.
[0023]
As shown in FIGS. 2, 3, and 5, the connection body 12 includes a connection shaft 27 made of metal (such as nickel) and a support body 28 made of synthetic resin, and the connection shaft 27 holds the support body 28. The tube portion 29 is penetrated in a press-fit state, and is completely sealed by an O-ring 31 interposed between the flange portion 27a of the connection shaft 27 and the inner periphery of the holding tube portion 29. Further, a pair of triangular wing portions 30 project from the holding cylinder portion 29 on the support body 28 and are configured to be joined to the individual frames 26 when the connecting body 12 is disposed in the notch 13. .
[0024]
As shown in FIGS. 2, 3, and 6, the cover 5 has an individual frame 32 formed on the inner surface so as to correspond to the upper frame 26 of each battery case 14, and an inverted L-shaped cross section on the outer periphery. The outer peripheral frame 33 hangs down, and sealing ridges 34 are formed on both ends in the longitudinal direction, which are joined to the upper end of the distribution header forming rod 22 to form the distribution header 35 in a sealed manner.
[0025]
In addition, a terminal mounting hole 8 is formed on one side of both ends of the lid 5, and a joining protrusion 36 that joins the inlet orifice 10 and the outlet orifice 11 is provided on the other side. These orifices 10 and 11 are configured by projecting a connection port 38 from the tip of the short side of the J-shaped box piece 37 whose plane shape is substantially J-shaped and whose lower surface is open. In addition, a communication opening 39 that communicates with the distribution header 35 is formed at a portion of the lid 5 that faces the front end of the long side of the J-shaped box piece 37.
[0026]
Further, as shown in FIG. 7A, the inner surface of the cooling jacket member 3 forms a meandering flow passage 40 that meanders up and down so that the cooling medium flows evenly over the entire surface of the cooling medium passage 21. A ridge 41 is provided. Instead of the straightening ridges 41, as shown in FIG. 7 (b), a plurality of horizontal straightening ridges 42 that are short in the upper part and long in the lower part may be provided at appropriate intervals in the vertical direction. As shown in FIG. 7C, these straightening ridges 41 and 42 are not necessarily provided, but in this case, a cooling medium staying area 43 is generated at both lower portions of the cooling medium passage 21 and the arrangement direction Since there is a possibility that the lower part of the unit cell 2 at both ends is not sufficiently cooled, it is desirable to provide the straightening ridges 41 and 42. In addition, you may provide these rectification protrusions 41 and 42 in the battery case 14 side of the cell 2. As shown in FIG.
[0027]
In the collective sealed secondary battery 1 having the above configuration, when the cooling medium is supplied from the inlet orifice 10, it flows into the cooling medium passages 21 on both sides through the distribution header 35, and the inside of the cooling medium passage 21 is set downstream. And flows between the cooling medium passages 21 and 21 on both sides through the cooling medium passage 18 between the unit cells 2, and all the sides including the opposing wall surface 16 of the battery case 14 of the unit cell 2 are the cooling medium. And the cooling medium is then discharged from the outlet orifice 11. Therefore, the four side surfaces of all the unit cells 2 are effectively cooled by the cooling medium.
[0028]
In addition, since the unit cells 2 are welded and integrally joined to each other to form an integrated battery case, and the integrated lid 5 is welded and sealed to the opening, the number of parts and assembly man-hours are reduced. The integrated sealed secondary battery 1 can be obtained as an integrated battery case, and the protrusions 17 are formed on the opposing wall surface 16 of the battery case 14 of each unit cell 2 so that the protrusions 17 are brought into contact with each other. Since it is welded, the cooling medium passage 18 over the substantially entire surface between the opposing wall surfaces 16 and 16 can be formed easily and inexpensively.
[0029]
Moreover, since the compact cooling plate member 3 is joined to the both sides of the unit cell row to form the cooling medium passages 21 on both sides, the weight can be reduced.
[0030]
In addition, an inlet orifice 10 and an outlet orifice 11 of the cooling medium that supplies and discharges the cooling medium to and from the cooling medium passages 21 on both sides are arranged at both ends in the unit cell arrangement direction, and the cooling medium on both sides via the distribution header 35. Since it is connected to the passage 21, it is possible to effectively cool the entire circumference of all the unit cells 2 in combination with the above configuration in a single cooling medium path.
[0031]
In the above description of the embodiment, as shown in FIG. 8A, the example in which the cooling medium passage 18 is disposed between the unit cells 2 and 2 is shown, but as shown in FIG. 8B. In addition, the cooling medium passage 18 may be formed between the two single cells 2 so that the total length L of the secondary battery 1 remains the same, and the width of the cooling medium passage 18 is changed from t to t. Since the flow passage cross-sectional area can be increased, the pressure loss in the cooling medium passage 18 can be reduced.
[0032]
In the above description of the embodiment, the example in which the inlet orifice 10 and the outlet orifice 11 are arranged on one side in the direction orthogonal to the arrangement direction of the unit cells 2 is shown. However, as shown in FIG. Orifice 10 and outlet orifice 11 may be arranged at diagonal positions so that the cooling medium flows through cooling medium passage 18 between cells 2 and 2. In the example of FIG. 9A, a meandering passage is formed by the cooling medium passage 21 on both sides and the cooling medium passage 18 between the cells. Further, in the example of FIG. 9B, the inlet orifice 10 is provided at one end of the cooling medium passage 21 on one side, and the outlet orifice 11 is provided at the other end of the cooling medium passage 21 on the other side. I try to flow.
[0033]
In the above embodiment, the lid 5 is covered on the end plate 6 and the inlet orifice 10 and the outlet orifice 11 are provided on the lid 5. However, as shown in FIG. Covering only the battery 2 group, the distribution header portion 52 is integrally provided at the upper end portions of the end plates 6 at both ends, the inlet orifice 10 and the outlet orifice 11 are provided on the upper surface thereof, and the upper ends at both ends of the cooling jacket member 3. A connecting portion 53 that connects the internal cooling medium passage 21 to both ends of the distribution header portion 52 may be bent. In FIG. 10, the hatched portions are the assembly of the unit cells 2 and the welded portion 54 of the cooling jacket member 3.
[0034]
Also in this embodiment, the same operation effect as the above embodiment can be basically obtained.
[0035]
Moreover, although the example which integrally bonds each structural member by welding was shown in the said embodiment, you may integrally bond with an adhesive material.
[0036]
【The invention's effect】
According to the collective sealed secondary battery of the present invention, as is apparent from the above description, the cooling medium passage is communicated between the battery case of each unit cell and both sides thereof with respect to the arrangement direction of the unit cell. Since all the sides of the unit cell including the unit cells can be forcibly cooled by the cooling medium with the cooling medium passing through these cooling medium passages, all the unit cells can be effectively cooled. Can do.
[0037]
Further, if the cooling medium passage is provided also outside the unit cells at both ends of the collective sealed secondary battery, the outer surfaces of the unit cells at both ends can be forcibly cooled.
[0038]
In addition, when the cooling jacket member is joined to both sides of the collective sealed secondary battery unit cell and / or both ends of the unit cell arrangement direction, the cooling medium passage can be easily formed by the cooling jacket member. It can be made lightweight.
[0039]
In addition, when a protrusion is provided on at least one of the opposite wall surfaces of each battery cell and a cooling medium passage is formed between both wall surfaces, the protrusion is provided on the opposite wall surface of each battery cell. By merely forming the cooling medium passage, it is possible to easily and inexpensively form a cooling medium passage over substantially the entire surface between the opposing wall surfaces of the unit cell.
[0040]
Further, if the rectifying protrusions are provided in the cooling medium passage so that the cooling medium flows through the entire surfaces of the cooling medium passages on both sides, the whole can be reliably and evenly cooled, and high cooling performance can be secured. .
[0041]
Further, when the unit cells are integrally joined to each other and the opening is sealed with an integrated lid, a collective sealed secondary battery having an integrated battery case can be obtained with a small number of parts and assembly man-hours. .
[0042]
In addition, when the battery case and the lid of the unit cell, or the battery case, the lid and the cooling jacket member of the unit cell are made of synthetic resin and alternately joined by welding, the unit cell is An assembled battery can be easily obtained as an integrated battery case.
[0043]
In addition, when an inlet orifice and an outlet orifice of a cooling medium that supplies and discharges the cooling medium to and from the cooling medium passages on both sides are arranged at both ends in the unit cell arrangement direction, and connected to the cooling medium passages on both sides through a distribution header. The cooling medium can be supplied and discharged from a single inlet orifice and outlet orifice, and the cooling pipe for the secondary battery can be simplified.
[0044]
In addition, if a cooling medium passage is formed between the two battery cells, the cross-sectional area of one cooling medium passage can be increased with the same overall length, and the pressure loss in the cooling medium passage can be reduced. Can do.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an embodiment of a collective sealed secondary battery of the present invention.
FIG. 2 is a longitudinal side view of the embodiment.
FIG. 3 is a partially longitudinal front view of the same embodiment;
FIG. 4 is a partial perspective view of the intermediate lid of the same embodiment.
FIG. 5 is a perspective view of the electrical connection body of the embodiment.
FIG. 6 is a perspective view of the lid according to the embodiment.
FIG. 7 is a longitudinal sectional view showing various configuration examples in the cooling medium passages on both sides of the same embodiment;
FIG. 8 is a schematic cross-sectional plan view showing an arrangement state of a cooling medium passage and a modification example thereof in the same embodiment.
FIG. 9 is a schematic cross-sectional plan view of a flow path configuration example for forming a flow of another cooling medium in the same embodiment.
FIG. 10 is an exploded perspective view of another embodiment of the collective sealed secondary battery of the present invention.
FIG. 11 is a front view of a collective sealed secondary battery of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Collective type sealed secondary battery 2 Single cell 3 Cooling jacket member 5 Lid 10 Inlet orifice 11 Outlet orifice 14 Battery case 15 Power generation element 16 Opposing wall surface 17 Projection 18 Cooling medium passage 21 Cooling medium passage 35 on both sides Distribution header 41 Rectification Ridge 42 straightening ridge

Claims

In a collective hermetic secondary battery in which a plurality of single cells, each of which has a power generation element housed in a bottomed rectangular cylindrical battery case and whose opening is sealed, are arranged in series, the cooling medium passage is connected to the electric power of each single battery. These are formed by communicating between the tanks and both sides of the cell arrangement direction, and the cooling jacket member is joined to both sides of the cell arrangement direction and / or both ends of the cell arrangement direction. A protrusion projecting on at least one of the opposing wall surfaces of the battery case of each unit cell, forming a cooling medium passage between the opposing wall surfaces, and contacting each other among the unit cells among the protrusions. A collective sealed secondary battery in which the protruding parts are welded to each other and each unit cell is integrally joined as an integral battery case.

2. The collective sealed secondary battery according to claim 1, wherein the cooling medium passage is also provided outside the unit cells at both ends of the collective sealed secondary battery.

2. The collective sealed secondary battery according to claim 1, wherein a rectifying ridge is provided in the cooling medium passage so that the cooling medium flows through the entire surface of the cooling medium passage on both sides in the unit cell arrangement direction.

The collective sealed secondary battery according to any one of claims 1 to 3 , wherein the single cells are integrally joined to each other and the opening is sealed with an integral lid.

5. The collective sealed secondary battery according to claim 4, wherein the battery case and the lid of the unit cell are made of synthetic resin and are joined together by welding.

5. The collective sealed secondary battery according to claim 4 , wherein the battery case, the lid and the cooling jacket member of the unit cell are made of synthetic resin and are joined together by welding.

The inlet and outlet orifices of the cooling medium to be supplied to and discharged from the cooling medium passages on both sides of the unit cell arrangement direction are arranged at both ends in the unit cell arrangement direction, and to the cooling medium passages on both sides through the distribution header. 3. The collective sealed secondary battery according to claim 1, wherein the assembled sealed secondary battery is connected.

Aggregate type sealed battery according to claim 1 or 2, characterized in that the formation of the cooling medium passage therebetween for each battery jar of two unit cells.