JP2004071179A - Laminated battery, assembled battery and assembled battery module - Google Patents

Abstract

The present invention provides a laminated external battery capable of suppressing intrusion of moisture from the seal portion into the inside of the battery and improving the durability of the battery.
A laminated packaged battery has a laminated film provided with a seal layer forming a seal portion, a battery body covered with a laminated film in which the seal layers are joined together, and one end electrically connected to the battery body. And electrode leads 17 and 18 whose other ends protrude outward from the outer peripheral edge 11a of the laminate film. Then, the width dimension W of the seal portion from the outer peripheral edge of the laminate film was set to 10 mm or more.
[Selection diagram] Fig. 1

Description

【００１９】
表１および図２に示すように、シール部１２の幅寸法Ｗを５ｍｍおよび７ｍｍに設定した場合には、水分浸入量は、それぞれ、１３５ｐｐｍ／ｗｅｅｋおよび７２ｐｐｍ／ｗｅｅｋであり、管理値（５０ｐｐｍ／ｗｅｅｋ）を超えた。シール部１２の幅寸法Ｗを１０ｍｍに設定した場合には、水分浸入量は４３ｐｐｍ／ｗｅｅｋであり、管理値以下となった。シール部１２の幅寸法Ｗを２０ｍｍに設定した場合には、水分浸入量は３５ｐｐｍ／ｗｅｅｋであり、管理値以下となった。シール部１２の幅寸法Ｗが１０ｍｍを超えると、シール部１２から電池内部への水分の浸入を抑える効果はあまり変わらなかった。
【００２０】
この実験結果より、ラミネートフィルム１１の外周縁辺１１ａからのシール部１２の幅寸法Ｗを１０ｍｍ以上に設定すれば、シール部１２から電池内部への水分の浸入を抑え得ることが判明した。
【００２１】
以上説明したように、第１の実施形態に係るラミネート外装電池１０にあっては、ラミネートフィルム１１の外周縁辺１１ａからのシール部１２の幅寸法Ｗは１０ｍｍ以上であるので、水分がシール部１２を通って電池内部にまで拡散するのに必要な距離が長くなり、水分が電池内部にまで到達し難くなる。これにより、シール部１２から電池内部への水分の浸入を抑え、電池の耐久性を向上できる。
【００２２】
なお、一対のラミネートフィルム１１により電池本体１６を被覆する例を挙げたが、正負の電極リード１７、１８の両者が電池本体１６の一の端面に接続されている場合には、袋状のラミネートフィルムを用いて電池本体１６を被覆することができる。長尺のラミネートフィルムを２つ折りにして袋状に形成した場合には、折り返した部分には、水分が浸入する微小隙間は存在しない。したがって、このようなときには、残り３辺のシール部１２の幅寸法Ｗを１０ｍｍ以上に設定すればよい。
【００２３】
（第２の実施形態）
図３は、本発明の第２の実施形態を示す図であり、第１の実施形態に係るラミネート外装電池１０を積層した状態を示す正面図である。
【００２４】
上述した第１の実施形態に係るラミネート外装電池１０は、シール部１２の幅寸法Ｗを１０ｍｍ以上に設定してあるため、比較的長いシール部１２を、冷却用の放熱部として利用することが可能となる。
【００２５】
第２の実施形態は、この点に着目し、複数個のラミネート外装電池１０を、それぞれのシール部１２がフィンの形態をなすように並べて、積層したものである。図示例においては、上位側のラミネート外装電池１０におけるシール部１２と、下位側のラミネート外装電池１０におけるシール部１２との間に空気通路２０が形成され、この空気通路２０に白抜き矢印２１で示される冷却風を供給している。
【００２６】
このように構成すれば、シール部１２は放熱用のフィンとしての機能を発揮し、電池本体１６において生じた熱がシール部１２から雰囲気中に放出される。その結果、電池本体１６が冷却され、電池の耐久性を向上できる。
【００２７】
以上説明したように、第２の実施形態に係るラミネート外装電池１０にあっては、シール部１２は放熱用のフィンとしての機能を有していることから、電池本体１６を効率よく冷却することができ、電池の耐久性を向上できる。
【００２８】
なお、冷却風を供給する場合を示したが、冷却風を供給せずに、放射ないし輻射によって、電池本体１６において生じた熱を雰囲気中に伝達する形態でも、電池本体１６を冷却して電池の耐久性を向上できる。
【００２９】
また、積層した例を示したが、１個のラミネート外装電池１０であっても、シール部１２が放熱用のフィンとしての機能を有していることは言うまでもない。
【００３０】
（第３の実施形態）
図４（Ａ）は、本発明の第３の実施形態に係るラミネート外装電池３０の要部を示す断面図、図４（Ｂ）は、一対のラミネートフィルム３１により形成されるシール部３２を示す概略断面図である。
【００３１】
図４（Ａ）（Ｂ）に示すように、第３の実施形態に係るラミネート外装電池３０は、シール部３２を形成するシール層３３を備える一対のラミネートフィルム３１と、シール層３３同士を接合した一対のラミネートフィルム３１によって被覆される電池本体３６と、を有している。図示省略するが、第１の実施形態と同様に、電池本体３６には正負の電極リードの一端が電気的に接続され、各電極リードの他端は、ラミネートフィルム３１から外部に突出している。
【００３２】
各ラミネートフィルム３１は、可撓性を有し、図４（Ｂ）に示すように、内方から表面にかけて順に、シール部３２を形成するシール層３３と、アルミラミネートフィルムなどの金属層３４と、外装を形成する樹脂層３５とを有している。シール層３３は、熱融着性の樹脂から形成されている。熱融着性の樹脂材料としては、たとえば、ポリプロピレン（ＰＰ）などの熱可塑性樹脂材料が適用される。
【００３３】
各ラミネートフィルム３１は、略矩形状を有し、電池本体３６を挟み込むように被覆している。一対のラミネートフィルム３１は、電池本体３６の外側からフィルム端部にかけて、シール層３３同士が熱融着によって接合され、シール部３２が形成されている。
【００３４】
第３の実施形態にあっては、ラミネートフィルム３１は、シール層３３を形成する樹脂の中に、水分捕集剤３９を含んでいる。水分捕集剤３９としては、シリカゲル、ゼオライトまたは活性炭の粉末から形成されている。これらの材料は、取り扱いが容易で、しかも、水分捕集能力が高い材料である。
【００３５】
但し、シール層３３中に水分捕集剤３９を配合すると、シール層３３同士を熱融着した後の接合強度ないし接着強度が若干弱くなるため、シール部３２における接着強度の低下を可及的に抑える必要がある。
【００３６】
そこで、第３の実施形態にあっては、シール部３２における接着強度の低下を可及的に抑える観点から、シール層３３における水分捕集剤３９の配合率を、ラミネートフィルム３１の外周縁辺３１ａからのシール部３２の幅方向に沿って異ならせている。より詳しくは、シール部３２の幅方向に関して、外側つまり外周縁辺３１ａ側では水分捕集性能を重視する一方、内側つまり電池本体３６側では接着性能を重視し、水分捕集剤３９の配合率は、電池本体３６側よりも外周縁辺３１ａ側の方が大きくなるようにしてある。
【００３７】
一例を挙げれば、図４（Ａ）に示すように、シール部３２の幅方向に沿う略中央部分から外周縁辺３１ａ寄りの領域では、水分捕集性能を重視するため、シール層３３における水分捕集剤３９の配合率を体積比で１０％とした。一方、シール部３２の幅方向に沿う略中央部分から電池本体３６寄りの領域では、接着性能を重視するため、シール層３３における水分捕集剤３９の配合率を体積比で５％とした。
【００３８】
かかる構成によれば、シール部３２における水分捕集性能と、シール部３２が備えるべき接着性能との両者をバランスよく確保して、シール部３２から電池内部への水分の浸入を抑え、電池の耐久性を向上できる。
【００３９】
以上説明したように、第３の実施形態に係るラミネート外装電池３０にあっては、ラミネートフィルム３１は、シール層３３を形成する樹脂の中に、水分捕集剤３９を含み、シール層３３における水分捕集剤３９の配合率を、ラミネートフィルム３１の外周縁辺３１ａからのシール部３２の幅方向に沿って異ならせているので、シール部３２における水分捕集性能と、シール部３２が備えるべき接着性能との両者をバランスよく確保して、シール部３２から電池内部への水分の浸入を抑え、電池の耐久性を向上できる。
【００４０】
また、水分捕集剤３９の配合率は、電池本体３６側よりも外周縁辺３１ａ側の方が大きいので、シール部３２における外周縁辺３１ａ側では水分捕集性能が高められ、シール部３２における電池本体３６側では接着性能が高められ、水分捕集性能と接着性能との両者をバランスよく確保できる。
【００４１】
水分捕集剤３９は、シリカゲル、ゼオライトまたは活性炭の粉末から形成されているので、取り扱いが容易かつ水分捕集能力が高い材料を用いて、シール部３２における水分捕集性能を簡便かつ効率よく高めることができる。
【００４２】
なお、第３の実施形態に係るラミネート外装電池３０にあっては、ラミネートフィルム３１の外周縁辺３１ａからのシール部３２の幅寸法は特に限定されないが、第１の実施形態におけるラミネート外装電池３０と同様に、シール部３２の幅寸法Ｗを１０ｍｍ以上に設定してもよい。かかる構成の場合には、シール部３２の幅寸法Ｗを１０ｍｍ以上に設定したことと、シール層３３に水分捕集剤３９を配合したこととの両者の効果があいまって、シール部３２から電池内部への水分の浸入を一層抑えて、電池の耐久性をより一層向上できる。
【００４３】
また、シール部３２の幅方向に関して、外側つまり外周縁辺３１ａ側では接着性能を重視する一方、内側つまり電池本体３６側では水分捕集性能を重視して、水分捕集剤３９の配合率を、外周縁辺３１ａ側よりも電池本体３６側の方が大きくなるように設定することも可能である。
【００４４】
また、水分捕集剤３９の配合率は、必要とされる水分捕集性能および接着性能に応じて、適宜改変できる。
【００４５】
（第４の実施形態）
図５（Ａ）は、本発明の第４の実施形態に係る組電池４０を示す斜視図、図５（Ｂ）は、同組電池４０を側方から見た状態を示す透視図である。
【００４６】
図５（Ａ）（Ｂ）に示すように、第４の実施形態に係る組電池４０は、第１の実施形態のラミネート外装電池１０を、電気的に並列および直列に複数個（図示例では１６個）接続するとともにシール部１２が外部に露出するように電池収納ケース４１内に収納して構成されている。電池収納ケース４１の外部に露出したシール部１２は、第２の実施形態と同様に、放熱用のフィンとしての機能を有している。電池収納ケース４１の外部に露出したシール部１２の間に空気通路２０が形成され、この空気通路２０に白抜き矢印２１で示される冷却風を供給している。
【００４７】
このように構成すれば、電池収納ケース４１の外部に露出したシール部１２は放熱用のフィンとしての機能を発揮し、個々の電池本体１６において生じた熱がシール部１２から電池収納ケース４１外部の雰囲気中に放出される。その結果、個々の電池本体１６が冷却され、組電池４０全体の耐久性を向上できる。さらに、ラミネート外装電池１０を電気的に並列および直列に複数個接続することにより、要求される電池容量や電圧に応じた組電池４０を製作することができる。
【００４８】
図示する組電池４０では、４個のラミネートフィルム外装電池１０を電気的に並列に接続して一組の電池群が構成され、さらに、この電池群が電気的に直列に４組接続されている。各電池群は、図５（Ａ）に矢印ａで示される方向（図５（Ｂ）では紙面に垂直な方向）に、４個のラミネートフィルム外装電池１０が同極の電極リード１７、１８を揃えて重ねられている。正極側の４個の電極リード１７同士は電気的に接続され、負極側の４個の電極リード１８同士も電気的に接続されている。
【００４９】
図５（Ｂ）を参照して、左端に示される電池群における正極側の電極リード１７は、電池収納ケース４１を貫通して設けられた正極端子４２に電気的に接続されている。また、右端に示される電池群における負極側の電極リード１８は、電池収納ケース４１を貫通して設けられた負極端子４３に電気的に接続されている。電池群同士の間は、負極側の電極リード１８と正極側の電極リード１７とが電気的に接続されている。
【００５０】
正極側の電極リード１７同士の接続および負極側の電極リード１８同士の接続は、適当な接続手段を利用して接続されている。具体的には、超音波溶接、熱溶接、レーザ溶接、リベット締結、または、かしめ締結など、従来公知の各種接続技術を利用して接続されている。好ましくは、熱が発生しにくく、ラミネートフィルム１１のシール部１２への熱的負荷が低い、超音波溶接を用いるのが望ましい。
【００５１】
電池群間における負極側の電極リード１８と正極側の電極リード１７との接続も、超音波溶接などによって接続されている。正極端子４２と正極側の電極リード１７との接続および負極端子４３と負極側の電極リード１８との接続も同様に、超音波溶接などによって接続されている。
【００５２】
以上説明したように、第４の実施形態に係る組電池４０にあっては、第１の実施形態のラミネート外装電池１０を、電気的に並列および直列に複数個接続するとともにシール部１２が外部に露出するように電池収納ケース４１内に収納し、外部に露出したシール部１２が、放熱用のフィンとしての機能を有していることから、個々の電池本体１６を効率よく冷却することができ、組電池４０全体の耐久性を向上できる。さらに、要求される電池容量や電圧に応じた組電池４０を製作することができる。
【００５３】
また、ラミネート外装電池３０の電極リード１７、１８同士間を、超音波溶接、熱溶接、レーザ溶接、リベット締結、または、かしめ締結により電気的に接続して構成される組電池４０であるので、各種の接続技術を利用して組電池４０を製作することができる。特に、超音波溶接を用いる場合には、ラミネートフィルム１１のシール部１２への熱的負荷を低減しつつ、組電池４０を製作することができる。
【００５４】
なお、冷却風を供給する場合を示したが、冷却風を供給せずに、放射ないし輻射によって、電池本体１６において生じた熱を雰囲気中に伝達する形態でも、個々の電池本体１６を冷却して組電池４０全体の耐久性を向上できる。
【００５５】
また、１６個のラミネート外装電池１０を電気的に並列および直列に複数個接続した組電池４０を例示したが、本発明はこの場合に限定されるものではない。例えば、少なくとも２個以上のラミネート外装電池１０を電気的に並列にのみ接続した組電池や、少なくとも２個以上のラミネート外装電池１０を電気的に直列にのみ接続した組電池とすることも可能である。これら電気的な接続形態、つまり、並列接続とするか、直列接続とするか、並列／直列の複合接続とするかは、組電池に要求される電池容量や電圧などに応じて、最適な接続形態が選択される。ラミネート外装電池１０の個数についても、組電池に要求される電池容量や電圧などに応じて、最適な個数が選択される。
【００５６】
また、電極リード１７、１８同士を接続する場合において、電極リード１７、１８同士を直接接続する形態の他、バスバーなどの適当な導電部材を介して接続する形態も採用できる。また、正負の端子４２、４３と正負の電極リード１７、１８とを接続する場合において、リード線を用いて電気的に接続する形態も採用できる。
【００５７】
（第５の実施形態）
図６（Ａ）は、本発明の第５の実施形態に係る組電池５０を示す斜視図、図６（Ｂ）は、同組電池５０を側方から見た状態を示す透視図である。
【００５８】
図６（Ａ）（Ｂ）に示すように、第５の実施形態に係る組電池５０は、第３の実施形態のラミネート外装電池３０を、電気的に並列および直列に複数個（図示例では１６個）接続するとともに電池収納ケース５１内に収納して構成されている。図６（Ｂ）中の符号「３７」および「３８」は、正極側の電極リードおよび負極側の電極リードをそれぞれ示している。使用するラミネート外装電池３０の種類およびシール部３２を電池収納ケース５１の外部に露出させない点を除いては、第４の実施形態の組電池４０と同様であるので、さらなる説明は省略する。
【００５９】
このように構成すれば、シール部３２における水分捕集性能と、シール部３２が備えるべき接着性能との両者をバランスよく確保して、シール部３２から電池内部への水分の浸入を抑え、個々の電池の耐久性ひいては組電池５０全体の耐久性を向上できる。さらに、ラミネート外装電池３０を電気的に並列および直列に複数個接続することにより、要求される電池容量や電圧に応じた組電池５０を製作することができる。
【００６０】
以上説明したように、第５の実施形態に係る組電池５０にあっては、第３の実施形態のラミネート外装電池３０を、電気的に並列および直列に複数個接続するとともに電池収納ケース５１内に収納していることから、シール部３２における水分捕集性能と、シール部３２が備えるべき接着性能との両者をバランスよく確保して、シール部３２から電池内部への水分の浸入を抑え、個々の電池の耐久性ひいては組電池５０全体の耐久性を向上できる。さらに、要求される電池容量や電圧に応じた組電池５０を製作することができる。
【００６１】
また、ラミネート外装電池３０の電極リード３７、３８同士間を、超音波溶接、熱溶接、レーザ溶接、リベット締結、または、かしめ締結により電気的に接続して構成される組電池５０であるので、各種の接続技術を利用して組電池５０を製作することができる。特に、超音波溶接を用いる場合には、ラミネートフィルム３１のシール部３２への熱的負荷を低減しつつ、組電池５０を製作することができる。
【００６２】
（第６の実施形態）
図７は、本発明の第６の実施形態に係る組電池モジュール６０を示す斜視図である。
【００６３】
図７に示すように、第６の実施形態に係る組電池モジュール６０は、第４の実施形態に係る組電池４０を、電気的に直列に複数個（図示例では４個）接続して構成されている。左端に示される組電池４０の負極端子４３には、外部負極端子６１が電気的に接続されている。右端に示される組電池４０の正極端子４２には、外部正極端子６２が電気的に接続されている。組電池４０同士の間は、正極端子４２と負極端子４３とがバスバー６３を介して電気的に接続されている。
【００６４】
このように構成すれば、電池収納ケース４１の外部に露出したシール部１２は放熱用のフィンとしての機能を発揮し、個々の電池本体１６において生じた熱がシール部１２から電池収納ケース４１外部の雰囲気中に放出される。その結果、個々の電池本体１６が冷却され、組電池４０全体の耐久性ひいては組電池モジュール６０全体の耐久性を向上できる。さらに、組電池４０を電気的に直列に複数個接続することにより、要求される電池容量や電圧に応じた組電池モジュール６０を製作することができる。
【００６５】
以上説明したように、第６の実施形態に係る組電池モジュール６０にあっては、第４の実施形態の組電池４０を、電気的に直列に複数個接続することから、個々の電池本体１６を効率よく冷却することができ、組電池４０全体の耐久性ひいては組電池モジュール６０全体の耐久性を向上できる。さらに、要求される電池容量や電圧に応じた組電池モジュール６０を製作することができる。
【００６６】
なお、４個の組電池４０を電気的に直列に複数個接続した組電池モジュール６０を例示したが、本発明はこの場合に限定されるものではない。例えば、少なくとも２個以上の組電池４０を電気的に並列にのみ接続した組電池モジュールや、少なくとも２個以上の組電池４０を電気的に直列にのみ接続した組電池モジュールや、複数個の組電池４０を電気的に並列および直列の複合接続とすることも可能である。これら電気的な接続形態、つまり、並列接続とするか、直列接続とするか、並列／直列の複合接続とするかは、組電池モジュールに要求される電池容量や電圧などに応じて、最適な接続形態が選択される。組電池４０の個数についても、組電池モジュールに要求される電池容量や電圧などに応じて、最適な個数が選択される。
【００６７】
（第７の実施形態）
図８は、本発明の第７の実施形態に係る組電池モジュール７０を示す斜視図である。
【００６８】
図８に示すように、第７の実施形態に係る組電池モジュール７０は、第５の実施形態に係る組電池５０を、電気的に直列に複数個（図示例では４個）接続して構成されている。使用する組電池５０の種類を除いては、第６の実施形態の組電池モジュール６０と同様であるので、さらなる説明は省略する。
【００６９】
このように構成すれば、シール部３２における水分捕集性能と、シール部３２が備えるべき接着性能との両者をバランスよく確保して、シール部３２から電池内部への水分の浸入を抑え、組電池５０全体の耐久性ひいては組電池モジュール７０全体の耐久性を向上できる。さらに、組電池５０を電気的に直列に複数個接続することにより、要求される電池容量や電圧に応じた組電池モジュール７０を製作することができる。
【００７０】
以上説明したように、第７の実施形態に係る組電池モジュール７０にあっては、第５の実施形態の組電池５０を、電気的に直列に複数個接続することから、シール部３２における水分捕集性能と、シール部３２が備えるべき接着性能との両者をバランスよく確保して、シール部３２から電池内部への水分の浸入を抑え、組電池５０全体の耐久性ひいては組電池モジュール７０全体の耐久性を向上できる。さらに、要求される電池容量や電圧に応じた組電池モジュール７０を製作することができる。
【００７１】
（第８の実施形態）
図９は、本発明に係るラミネート外装電池１０、３０を車載用電池８０に使用した第８の実施形態に係る車両８１を示す図である。
【００７２】
本発明に係るラミネート外装電池１０、３０を車載用電池８０に適用することは、非常に有効である。車両８１の振動に起因するシール部１２、３２から電池内部への水分の浸入を抑え、電池の耐久性を向上する効果を有するからである。さらに、ラミネート外装電池１０、３０は金属製の外装缶を用いる電池と比較して軽量であるため、車載用電池８０の軽量化、引いては車両８１全体の軽量化を通して、燃費の向上に寄与するる効果を有するからである。
【００７３】
車載用電池８０の場合は、車両８１に要求される電池容量および電圧を満足する観点から、多数の電池が必要である。このため、図７および図８に示した組電池モジュール６０、７０の形態で車両８１に搭載される。第８の実施形態では、車両８１の車内空間やトランクルームを広く確保するために、車体中央部の座席下に組電池モジュール６０、７０を設置している。但し、組電池モジュール６０、７０の設置場所は、上記の場所に制限されるものではなく、後部トランクルームの下部に設置してもよい。また、ＥＶやＦＣＶ（燃料電池自動車）のようにエンジンを搭載しない車両であれば、エンジンが一般的に搭載される車両前方に設置することもできる。
【００７４】
なお、組電池モジュール６０、７０の形態で車両８１に設置する場合に限定されず、使用用途に応じては組電池４０、５０の形態で車両８１に設置することもできる。また、組電池モジュール６０、７０と組電池４０、５０とを適当に組み合わせて車両８１に設置してもよい。さらに、本発明に係るラミネート外装電池１０、３０を設置し得る車両８１としては、ＥＶ、ＨＥＶ、ＦＣＶが好ましいが、これらに制限されるものではない。
【００７５】
次に、組電池モジュールを構成する組電池４０、５０の数量について、車両８１の動力源に要求される電圧を満たす観点から説明する。
【００７６】
ラミネート外装電池１０、３０の１個の動作電圧は３．５Ｖ（ボルト）であり、図示した組電池４０、５０は、当該ラミネート外装電池１０、３０が４個直列接続されている。
【００７７】
一般的な自動車電源の電圧は１２Ｖであるため、該電圧を供給するためには、組電池４０、５０を１個だけ使用すればよい。
【００７８】
自動車の消費電力の増大に対応するために、自動車電源の電圧を４２Ｖに上げる場合には、該電圧を供給するためには、組電池４０、５０を３個直列接続した組電池モジュールを使用すればよい。
【００７９】
また、現在、一般的に普及しているＥＶおよびＨＥＶに用いられる電圧を供給するためには、組電池４０、５０を２４個直列接続した組電池モジュールを使用すればよい。
【００８０】
このように、車両８１の動力源の仕様にしたがって組電池４０、５０を直列接続する個数が決定される。図示した組電池４０、５０はラミネート外装電池１０、３０を４個直列接続しているため、この組電池４０、５０を直列接続する個数を変えれば、車両８１において要求される電圧を容易に供給することができる。
【図面の簡単な説明】
【図１】図１（Ａ）は、本発明の第１の実施形態に係るラミネート外装電池を示す平面図、図１（Ｂ）は、同図（Ａ）の１Ｂ−１Ｂ線に沿う断面図であり、一対のラミネートフィルムにより形成されるシール部を示す概略断面図である。
【図２】シール部の幅寸法と水分浸入量との関係を調べた実験結果を示す図である。
【図３】本発明の第２の実施形態を示す図であり、第１の実施形態に係るラミネート外装電池を積層した状態を示す正面図である。
【図４】図４（Ａ）は、本発明の第３の実施形態に係るラミネート外装電池の要部を示す断面図、図４（Ｂ）は、一対のラミネートフィルムにより形成されるシール部を示す概略断面図である。
【図５】図５（Ａ）は、本発明の第４の実施形態に係る組電池を示す斜視図、図５（Ｂ）は、同組電池を側方から見た状態を示す透視図である。
【図６】図６（Ａ）は、本発明の第５の実施形態に係る組電池を示す斜視図、図６（Ｂ）は、同組電池を側方から見た状態を示す透視図である。
【図７】本発明の第６の実施形態に係る組電池モジュールを示す斜視図である。
【図８】本発明の第７の実施形態に係る組電池モジュールを示す斜視図である。
【図９】本発明に係るラミネート外装電池を車載用電池に使用した第８の実施形態に係る車両を示す図である。
【符号の説明】
１０、３０…ラミネート外装電池
１１、３１…ラミネートフィルム
１１ａ、３１ａ…ラミネートフィルムの外周縁辺
１２、３２…シール部
１３、３３…シール層
１６、３６…電池本体
１７、１８、３７、３８…電極リード
２０…空気通路
３９…水分捕集剤
４０、５０…組電池
４１、５１…電池収納ケース
４２…正極端子
４３…負極端子
６０、７０…組電池モジュール
６１…外部負極端子
６２…外部正極端子
８０…車載用電池
８１…車両
Ｗ…シール部の幅寸法[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a laminated battery.
[0002]
2. Description of the Related Art
2. Description of the Related Art In recent years, a battery covered with a laminate film, that is, a laminated exterior battery, has been used as a power source of an electric vehicle (EV) powered by electricity or a hybrid car (HEV) combining an engine and a motor from the viewpoint of weight reduction. Is attracting attention.
[0003]
Generally, a laminated exterior battery includes a pair of laminated films provided with a seal layer forming a seal portion, and the battery body is covered with a pair of laminated films in which the seal layers are joined to each other. The other end of the electrode lead, one end of which is electrically connected to the battery body, penetrates the seal portion and protrudes to the outside of the laminate film (see JP-A-2002-134074).
[0004]
However, in the case of a laminated exterior battery, a minute gap may be generated between the bonded seal layers due to deformation due to an external force, an increase in the temperature of the battery, and the like. Due to the formation of the minute gap, a small amount of moisture penetrates into the laminated battery through the seal portion, which causes a problem that the durability and performance of the battery are reduced.
[0005]
The present invention has been made in order to solve the problems associated with the conventional technology, and it is an object of the present invention to provide a laminated external battery capable of suppressing the intrusion of moisture from the seal portion into the battery and improving the durability of the battery. Aim.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a laminate film having a seal layer forming a seal portion, a battery body covered by the laminate film in which the seal layers are joined together, and one end of the battery body being electrically connected. An electrode lead protruding outside from the outer peripheral edge of the laminate film, the width of the seal portion from the outer peripheral edge of the laminate film being 10 mm or more. It is an exterior battery. The seal portion also has a function as a fin for heat radiation.
[0007]
【The invention's effect】
According to the present invention, since the width dimension of the seal portion from the outer peripheral edge of the laminate film is set to 10 mm or more, the distance required for moisture to diffuse through the seal portion to the inside of the battery becomes longer, and It is difficult to reach inside. Accordingly, it is possible to prevent moisture from entering the inside of the battery from the seal portion, and it is possible to improve the durability of the battery.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
In this specification, “unit cell”, “assembled battery”, and “assembled battery module” are defined as follows, respectively. The “unit cell” refers to one battery, and in the present specification, refers to a battery in which a battery main body is covered with a flexible laminated film, that is, a so-called laminated battery. The term “assembled battery” refers to a battery in which a plurality of laminated exterior batteries are electrically connected. The term “assembled battery module” refers to a battery in which a plurality of assembled batteries are electrically connected. Not only "unit cells" but also "assembled batteries" and "assembled battery modules" are used as batteries. The names of "unit cell", "assembled battery" and "assembled battery module" are used to make it easy to understand the difference in size of the batteries.
[0010]
(1st Embodiment)
FIG. 1A is a plan view showing a laminated battery 10 according to the first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line 1B-1B in FIG. FIG. 3 is a schematic cross-sectional view showing a seal portion 12 formed by a pair of laminate films 11.
[0011]
As shown in FIGS. 1 (A) and 1 (B), in a laminated battery 10 according to the first embodiment, a pair of laminated films 11 provided with a seal layer 13 forming a seal portion 12 and the seal layers 13 are joined to each other. A battery body 16 covered with the pair of laminated films 11 described above, and positive and negative electrode leads 17 and 18 having one end electrically connected to the battery body 16. Each of the positive and negative electrode leads 17 and 18 is connected to the opposite end face of the battery body 16. The other ends of the electrode leads 17 and 18 protrude from the outer peripheral edge 11a of the laminate film 11 to the outside.
[0012]
Each laminate film 11 is a composite sheet having flexibility and generally comprising two or more sheets. As shown in FIG. 1 (B), in order from the inside to the surface, a sealing layer 13 forming a sealing portion 12, a metal layer 14 such as an aluminum laminated film, and a resin layer 15 forming an exterior are provided. I have. The seal layer 13 is formed from a heat-fusible resin. As the heat-fusible resin material, for example, a thermoplastic resin material such as polypropylene (PP) is applied.
[0013]
Each laminate film 11 has a substantially rectangular shape, and covers the battery body 16 so as to sandwich it. In the pair of laminate films 11, the seal layers 13 are joined by heat fusion from the outside of the battery body 16 to the end of the film. The outer peripheral edge or ear portion where the seal layers 13 are joined to each other is referred to as a seal portion 12.
[0014]
The pair of laminated films 11 cannot be joined to each other at the portions where the electrode leads 17 and 18 protrude. For this reason, a sealing material (not shown) is provided at the boundary between the electrode leads 17 and 18 and the laminate film 11 to prevent water from entering the inside of the battery.
[0015]
In the illustrated example, the width W of the sealing portion 12 from the outer peripheral edge 11a of the laminated film 11 is set to 10 mm or more over the entire circumference. If the width W of the seal portion 12 is 10 mm or more, the distance required for moisture to diffuse through the seal portion 12 to the inside of the battery becomes long, and it is difficult for moisture to reach the inside of the battery. Thereby, invasion of moisture from the seal portion 12 into the inside of the battery can be suppressed, and the durability of the battery can be improved.
[0016]
FIG. 2 is a diagram showing an experimental result of examining the relationship between the width dimension W of the seal portion 12 and the amount of water penetration.
[0017]
In the experiment, an organic solvent was sealed in a laminate film pack and left in an environment of 60 ° C. and 80% humidity for 7 days, and then the amount of water in the solvent was measured by the Karl Fischer method. The amount of water penetration was measured for each of the test products in which the width W of the seal portion 12 was set to 5 mm, 7 mm, 10 mm, and 20 mm. Table 1 shows the measurement results.
[0018]
[Table 1]

[0019]
As shown in Table 1 and FIG. 2, when the width dimension W of the seal portion 12 is set to 5 mm and 7 mm, the amounts of water penetration are 135 ppm / week and 72 ppm / week, respectively, and the control value (50 ppm / week) week). When the width W of the seal portion 12 was set to 10 mm, the amount of infiltration of water was 43 ppm / week, which was below the control value. When the width W of the seal portion 12 was set to 20 mm, the amount of water penetration was 35 ppm / week, which was below the control value. When the width W of the seal portion 12 exceeded 10 mm, the effect of suppressing the intrusion of moisture from the seal portion 12 into the inside of the battery did not change much.
[0020]
From this experimental result, it has been found that when the width W of the seal portion 12 from the outer peripheral edge 11a of the laminate film 11 is set to 10 mm or more, the intrusion of moisture from the seal portion 12 into the battery can be suppressed.
[0021]
As described above, in the laminated battery 10 according to the first embodiment, the width W of the sealing portion 12 from the outer peripheral edge 11a of the laminated film 11 is 10 mm or more. Therefore, the distance required to diffuse through the battery to the inside of the battery increases, and it becomes difficult for moisture to reach the inside of the battery. Thereby, invasion of moisture from the seal portion 12 into the inside of the battery can be suppressed, and the durability of the battery can be improved.
[0022]
Although the example in which the battery main body 16 is covered with the pair of laminate films 11 has been described, when both the positive and negative electrode leads 17 and 18 are connected to one end surface of the battery main body 16, a bag-shaped laminate is used. The battery body 16 can be covered with a film. When the long laminate film is folded into two and formed into a bag shape, there is no minute gap into which moisture enters in the folded portion. Therefore, in such a case, the width dimension W of the remaining three sides of the seal portion 12 may be set to 10 mm or more.
[0023]
(Second embodiment)
FIG. 3 is a diagram showing the second embodiment of the present invention, and is a front view showing a state in which the laminated battery 10 according to the first embodiment is stacked.
[0024]
In the laminated battery 10 according to the first embodiment described above, since the width W of the seal portion 12 is set to 10 mm or more, the relatively long seal portion 12 can be used as a heat radiating portion for cooling. It becomes possible.
[0025]
In the second embodiment, attention is paid to this point, and a plurality of laminated exterior batteries 10 are arranged and stacked such that each seal portion 12 forms a fin. In the illustrated example, an air passage 20 is formed between the seal portion 12 of the upper laminated battery 10 and the seal portion 12 of the lower laminated battery 10. The cooling air shown is being supplied.
[0026]
With this configuration, the seal portion 12 functions as a fin for heat radiation, and heat generated in the battery body 16 is released from the seal portion 12 into the atmosphere. As a result, the battery main body 16 is cooled, and the durability of the battery can be improved.
[0027]
As described above, in the laminated exterior battery 10 according to the second embodiment, since the seal portion 12 has a function as a heat dissipating fin, the battery body 16 can be efficiently cooled. And the durability of the battery can be improved.
[0028]
Although the case where the cooling air is supplied is shown, the heat generated in the battery main body 16 is transmitted to the atmosphere by radiation or radiation without supplying the cooling air, and the battery main body 16 is cooled and the battery is cooled. Can be improved in durability.
[0029]
In addition, although an example in which the batteries are stacked is shown, it is needless to say that even in the case of a single laminated battery 10, the seal portion 12 has a function as a fin for heat radiation.
[0030]
(Third embodiment)
FIG. 4A is a cross-sectional view illustrating a main part of a laminated exterior battery 30 according to a third embodiment of the present invention, and FIG. 4B illustrates a sealing portion 32 formed by a pair of laminated films 31. It is a schematic sectional drawing.
[0031]
As shown in FIGS. 4A and 4B, the laminated battery 30 according to the third embodiment joins a pair of laminated films 31 provided with a seal layer 33 forming a seal portion 32 and the seal layers 33 to each other. And a battery main body 36 covered with the pair of laminated films 31. Although not shown, one end of positive and negative electrode leads is electrically connected to the battery main body 36 as in the first embodiment, and the other end of each electrode lead protrudes from the laminate film 31 to the outside.
[0032]
Each laminate film 31 has flexibility, and as shown in FIG. 4B, a seal layer 33 forming a seal portion 32 and a metal layer 34 such as an aluminum laminate film in order from the inside to the surface. And a resin layer 35 forming an exterior. The seal layer 33 is formed from a heat-fusible resin. As the heat-fusible resin material, for example, a thermoplastic resin material such as polypropylene (PP) is applied.
[0033]
Each laminate film 31 has a substantially rectangular shape and covers the battery body 36 so as to sandwich it. The sealing layers 33 of the pair of laminated films 31 are joined by heat sealing from the outside of the battery body 36 to the end of the film, thereby forming a sealing portion 32.
[0034]
In the third embodiment, the laminate film 31 contains a moisture collecting agent 39 in the resin forming the seal layer 33. The water collecting agent 39 is formed from powder of silica gel, zeolite or activated carbon. These materials are materials that are easy to handle and have a high moisture collecting ability.
[0035]
However, if the moisture trapping agent 39 is mixed into the seal layer 33, the bonding strength or the adhesive strength after heat sealing the seal layers 33 to each other is slightly reduced. Need to be suppressed.
[0036]
Therefore, in the third embodiment, from the viewpoint of minimizing the decrease in the adhesive strength in the seal portion 32, the mixing ratio of the moisture collecting agent 39 in the seal layer 33 is set to the outer peripheral edge 31a of the laminate film 31. The seal portion 32 is made different along the width direction. More specifically, with respect to the width direction of the seal portion 32, importance is attached to the moisture collection performance on the outer side, that is, the outer peripheral edge 31a side, while importance is attached to the adhesion performance on the inner side, that is, the battery body 36 side. The outer peripheral edge 31a side is larger than the battery main body 36 side.
[0037]
As an example, as shown in FIG. 4A, in a region near the outer peripheral edge 31 a from a substantially central portion along the width direction of the seal portion 32, importance is attached to the moisture collection performance. The mixing ratio of the collector 39 was set to 10% by volume. On the other hand, in a region closer to the battery main body 36 from a substantially central portion along the width direction of the seal portion 32, the blending ratio of the moisture collecting agent 39 in the seal layer 33 is set to 5% by volume ratio in order to emphasize adhesion performance.
[0038]
According to such a configuration, both the moisture collecting performance of the seal portion 32 and the adhesive performance to be provided by the seal portion 32 are ensured in a well-balanced manner, and the intrusion of moisture from the seal portion 32 into the inside of the battery is suppressed. Durability can be improved.
[0039]
As described above, in the laminated battery 30 according to the third embodiment, the laminated film 31 includes the moisture trapping agent 39 in the resin forming the seal layer 33, and Since the blending ratio of the moisture collecting agent 39 is varied along the width direction of the seal portion 32 from the outer peripheral edge 31a of the laminate film 31, the moisture collecting performance of the seal portion 32 and the seal portion 32 should be provided. It is possible to secure both the adhesion performance and the adhesion in a well-balanced manner, to suppress the penetration of moisture from the seal portion 32 into the inside of the battery, and improve the durability of the battery.
[0040]
Further, since the compounding ratio of the moisture collecting agent 39 is larger on the outer peripheral edge 31a side than on the battery main body 36 side, the moisture collecting performance is enhanced on the outer peripheral edge 31a side in the seal portion 32, and the battery in the seal portion 32 is improved. On the main body 36 side, the bonding performance is enhanced, and both the moisture collection performance and the bonding performance can be ensured in a well-balanced manner.
[0041]
Since the moisture trapping agent 39 is formed from silica gel, zeolite or activated carbon powder, the moisture trapping performance of the seal portion 32 can be easily and efficiently increased by using a material that is easy to handle and has high moisture trapping ability. be able to.
[0042]
In the laminated battery 30 according to the third embodiment, the width of the sealing portion 32 from the outer peripheral edge 31a of the laminated film 31 is not particularly limited. Similarly, the width dimension W of the seal portion 32 may be set to 10 mm or more. In the case of such a configuration, both the effect of setting the width dimension W of the seal portion 32 to 10 mm or more and the fact that the moisture collecting agent 39 is blended in the seal layer 33 combine the effects of the seal portion 32 and the battery. Infiltration of moisture into the inside can be further suppressed, and the durability of the battery can be further improved.
[0043]
Further, with respect to the width direction of the seal portion 32, the adhesion performance is emphasized on the outer side, that is, on the outer peripheral side 31a side, while the moisture collection performance is emphasized on the inner side, that is, on the battery body 36 side, and the mixing ratio of the moisture collector 39 is It is also possible to set so that the battery body 36 side is larger than the outer peripheral edge 31a side.
[0044]
Further, the mixing ratio of the moisture collecting agent 39 can be appropriately changed according to the required moisture collecting performance and adhesive performance.
[0045]
(Fourth embodiment)
FIG. 5A is a perspective view showing a battery pack 40 according to a fourth embodiment of the present invention, and FIG. 5B is a perspective view showing the battery pack 40 viewed from the side.
[0046]
As shown in FIGS. 5A and 5B, a battery pack 40 according to the fourth embodiment includes a plurality of laminated exterior batteries 10 of the first embodiment that are electrically connected in parallel and in series (in the illustrated example, in the illustrated example). 16) and housed in the battery housing case 41 so that the seal portion 12 is exposed to the outside. The seal portion 12 exposed to the outside of the battery storage case 41 has a function as a heat dissipating fin, as in the second embodiment. An air passage 20 is formed between the seal portions 12 exposed to the outside of the battery storage case 41, and a cooling air indicated by a white arrow 21 is supplied to the air passage 20.
[0047]
With such a configuration, the seal portion 12 exposed to the outside of the battery storage case 41 functions as a fin for heat dissipation, and heat generated in each battery body 16 is transferred from the seal portion 12 to the outside of the battery storage case 41. Released into the atmosphere. As a result, the individual battery bodies 16 are cooled, and the durability of the entire battery pack 40 can be improved. Further, by electrically connecting a plurality of laminated exterior batteries 10 in parallel and in series, it is possible to manufacture the assembled battery 40 according to the required battery capacity and voltage.
[0048]
In the illustrated assembled battery 40, four laminated film exterior batteries 10 are electrically connected in parallel to form a set of battery groups, and the four battery groups are electrically connected in series. . In each battery group, four laminated film-clad batteries 10 have electrode leads 17 and 18 having the same polarity in a direction indicated by an arrow a in FIG. 5A (a direction perpendicular to the paper surface in FIG. 5B). They are aligned and stacked. The four electrode leads 17 on the positive electrode side are electrically connected to each other, and the four electrode leads 18 on the negative electrode side are also electrically connected to each other.
[0049]
Referring to FIG. 5B, the positive electrode lead 17 in the battery group shown on the left end is electrically connected to a positive electrode terminal 42 provided through battery storage case 41. The electrode lead 18 on the negative electrode side of the battery group shown at the right end is electrically connected to a negative electrode terminal 43 provided through the battery housing case 41. Between the battery groups, the negative electrode lead 18 and the positive electrode lead 17 are electrically connected.
[0050]
The connection between the electrode leads 17 on the positive electrode side and the connection between the electrode leads 18 on the negative electrode side are connected using appropriate connection means. Specifically, the connection is made by using various conventionally known connection techniques such as ultrasonic welding, heat welding, laser welding, rivet fastening, or caulking fastening. Preferably, it is desirable to use ultrasonic welding, in which heat is hardly generated and the thermal load on the seal portion 12 of the laminate film 11 is low.
[0051]
The connection between the electrode lead 18 on the negative electrode side and the electrode lead 17 on the positive electrode side between the battery groups is also connected by ultrasonic welding or the like. Similarly, the connection between the positive electrode terminal 42 and the electrode lead 17 on the positive electrode side and the connection between the negative electrode terminal 43 and the electrode lead 18 on the negative electrode side are connected by ultrasonic welding or the like.
[0052]
As described above, in the battery pack 40 according to the fourth embodiment, a plurality of the laminated exterior batteries 10 of the first embodiment are electrically connected in parallel and in series, and the seal portion 12 is connected to the outside. Since the sealing portion 12 housed in the battery housing case 41 and exposed to the outside has a function as a heat dissipating fin, the individual battery main bodies 16 can be efficiently cooled. As a result, the durability of the entire battery pack 40 can be improved. Further, the assembled battery 40 according to the required battery capacity and voltage can be manufactured.
[0053]
In addition, since the electrode leads 17 and 18 of the laminated exterior battery 30 are electrically connected to each other by ultrasonic welding, heat welding, laser welding, rivet fastening, or caulking fastening, the assembled battery 40 is configured. The assembled battery 40 can be manufactured using various connection techniques. In particular, when ultrasonic welding is used, the assembled battery 40 can be manufactured while reducing the thermal load on the seal portion 12 of the laminate film 11.
[0054]
Although the case where the cooling air is supplied is shown, even when the heat generated in the battery body 16 is transmitted to the atmosphere by radiation or radiation without supplying the cooling air, the individual battery bodies 16 are cooled. Thus, the durability of the entire battery pack 40 can be improved.
[0055]
Further, the assembled battery 40 in which a plurality of 16 laminated exterior batteries 10 are electrically connected in parallel and in series has been exemplified, but the present invention is not limited to this case. For example, it is also possible to use an assembled battery in which at least two or more laminated exterior batteries 10 are electrically connected only in parallel, or an assembled battery in which at least two or more laminated exterior batteries 10 are electrically connected only in series. is there. These electrical connection modes, that is, parallel connection, series connection, or combined parallel / series connection are determined by the optimum connection according to the battery capacity and voltage required for the assembled battery. The form is selected. As for the number of laminated exterior batteries 10, an optimal number is selected according to the battery capacity and voltage required for the assembled battery.
[0056]
When the electrode leads 17 and 18 are connected to each other, a form in which the electrode leads 17 and 18 are directly connected to each other or a form in which the electrode leads 17 and 18 are connected via an appropriate conductive member such as a bus bar can be adopted. When the positive and negative terminals 42 and 43 and the positive and negative electrode leads 17 and 18 are connected, a form in which electrical connection is made using lead wires can also be adopted.
[0057]
(Fifth embodiment)
FIG. 6A is a perspective view showing a battery pack 50 according to a fifth embodiment of the present invention, and FIG. 6B is a perspective view showing the battery pack 50 viewed from the side.
[0058]
As shown in FIGS. 6A and 6B, the battery pack 50 according to the fifth embodiment includes a plurality of laminated exterior batteries 30 according to the third embodiment that are electrically parallel and in series (in the illustrated example, in the illustrated example). 16) are connected and housed in the battery housing case 51. Reference numerals “37” and “38” in FIG. 6B indicate a positive electrode lead and a negative electrode lead, respectively. Except for the type of the laminated exterior battery 30 to be used and the fact that the seal portion 32 is not exposed to the outside of the battery storage case 51, the battery is the same as the battery pack 40 of the fourth embodiment, and further description is omitted.
[0059]
With such a configuration, both the moisture collecting performance of the seal portion 32 and the adhesive performance to be provided by the seal portion 32 are ensured in a well-balanced manner, and the intrusion of moisture from the seal portion 32 into the inside of the battery is suppressed. Of the battery, and thus the durability of the battery pack 50 as a whole. Furthermore, by electrically connecting a plurality of laminated exterior batteries 30 in parallel and in series, it is possible to manufacture the assembled battery 50 according to the required battery capacity and voltage.
[0060]
As described above, in the battery pack 50 according to the fifth embodiment, a plurality of the laminated external batteries 30 according to the third embodiment are electrically connected in parallel and in series, and , The moisture collecting performance of the seal portion 32 and the adhesion performance to be provided by the seal portion 32 are both ensured in a well-balanced manner, and the infiltration of moisture from the seal portion 32 into the inside of the battery is suppressed. It is possible to improve the durability of each battery, and thus the durability of the entire battery pack 50. Further, the assembled battery 50 according to the required battery capacity and voltage can be manufactured.
[0061]
In addition, since the electrode leads 37 and 38 of the laminated exterior battery 30 are electrically connected to each other by ultrasonic welding, heat welding, laser welding, rivet fastening, or caulking fastening, the assembled battery 50 is configured. The assembled battery 50 can be manufactured using various connection techniques. In particular, when ultrasonic welding is used, the assembled battery 50 can be manufactured while reducing the thermal load on the sealing portion 32 of the laminate film 31.
[0062]
(Sixth embodiment)
FIG. 7 is a perspective view showing an assembled battery module 60 according to the sixth embodiment of the present invention.
[0063]
As shown in FIG. 7, an assembled battery module 60 according to the sixth embodiment is configured by electrically connecting a plurality (four in the illustrated example) of the assembled batteries 40 according to the fourth embodiment in series. Have been. An external negative terminal 61 is electrically connected to the negative terminal 43 of the battery pack 40 shown on the left end. An external positive terminal 62 is electrically connected to the positive terminal 42 of the battery pack 40 shown on the right end. Between the assembled batteries 40, the positive terminal 42 and the negative terminal 43 are electrically connected via the bus bar 63.
[0064]
With such a configuration, the seal portion 12 exposed to the outside of the battery storage case 41 functions as a fin for heat dissipation, and heat generated in each battery body 16 is transferred from the seal portion 12 to the outside of the battery storage case 41. Released into the atmosphere. As a result, the individual battery main bodies 16 are cooled, and the durability of the entire assembled battery 40 and thus the durability of the entire assembled battery module 60 can be improved. Further, by electrically connecting a plurality of assembled batteries 40 in series, an assembled battery module 60 corresponding to required battery capacity and voltage can be manufactured.
[0065]
As described above, in the assembled battery module 60 according to the sixth embodiment, since the plurality of assembled batteries 40 of the fourth embodiment are electrically connected in series, the individual battery Can be efficiently cooled, and the durability of the entire assembled battery 40 and thus the durability of the entire assembled battery module 60 can be improved. Furthermore, the assembled battery module 60 according to the required battery capacity and voltage can be manufactured.
[0066]
Although the assembled battery module 60 in which a plurality of four assembled batteries 40 are electrically connected in series has been illustrated, the present invention is not limited to this case. For example, an assembled battery module in which at least two or more assembled batteries 40 are electrically connected only in parallel, an assembled battery module in which at least two or more assembled batteries 40 are electrically connected only in series, or a plurality of assembled batteries It is also possible for the battery 40 to be an electrically parallel and series composite connection. Depending on the battery capacity and voltage required for the assembled battery module, the most suitable electrical connection mode, that is, whether to use parallel connection, series connection, or parallel / series combined connection is selected. The connection mode is selected. Regarding the number of assembled batteries 40, an optimal number is selected according to the battery capacity and voltage required for the assembled battery module.
[0067]
(Seventh embodiment)
FIG. 8 is a perspective view showing an assembled battery module 70 according to the seventh embodiment of the present invention.
[0068]
As shown in FIG. 8, an assembled battery module 70 according to the seventh embodiment is configured by electrically connecting a plurality (four in the illustrated example) of the assembled batteries 50 according to the fifth embodiment in series. Have been. Except for the type of the assembled battery 50 to be used, it is the same as the assembled battery module 60 of the sixth embodiment, and further description will be omitted.
[0069]
With such a configuration, both the moisture collecting performance of the seal portion 32 and the adhesion performance to be provided by the seal portion 32 are ensured in a well-balanced manner, and the infiltration of moisture from the seal portion 32 into the inside of the battery is suppressed. The durability of the entire battery 50 and thus the durability of the entire battery module 70 can be improved. Furthermore, by electrically connecting a plurality of assembled batteries 50 in series, an assembled battery module 70 corresponding to the required battery capacity and voltage can be manufactured.
[0070]
As described above, in the assembled battery module 70 according to the seventh embodiment, since the plurality of assembled batteries 50 of the fifth embodiment are electrically connected in series, the moisture in the seal portion 32 is reduced. The collection performance and the adhesive performance to be provided by the seal portion 32 are both ensured in a well-balanced manner, so that the infiltration of moisture from the seal portion 32 into the inside of the battery is suppressed, and the durability of the entire assembled battery 50 and, consequently, the entire assembled battery module 70 are improved. Can be improved in durability. Further, the assembled battery module 70 according to the required battery capacity and voltage can be manufactured.
[0071]
(Eighth embodiment)
FIG. 9 is a diagram showing a vehicle 81 according to an eighth embodiment in which the laminated exterior batteries 10 and 30 according to the present invention are used for a vehicle-mounted battery 80.
[0072]
It is very effective to apply the laminated exterior batteries 10 and 30 according to the present invention to the vehicle-mounted battery 80. This is because there is an effect of suppressing intrusion of moisture from the seal portions 12 and 32 into the inside of the battery due to the vibration of the vehicle 81 and improving the durability of the battery. Furthermore, since the laminated exterior batteries 10 and 30 are lighter in weight than batteries using a metal exterior can, they contribute to the improvement of fuel efficiency through the reduction of the weight of the in-vehicle battery 80 and, consequently, the weight of the entire vehicle 81. This is because it has an effect of slurping.
[0073]
In the case of the in-vehicle battery 80, a large number of batteries are required from the viewpoint of satisfying the battery capacity and voltage required for the vehicle 81. For this reason, it is mounted on the vehicle 81 in the form of the assembled battery modules 60 and 70 shown in FIGS. 7 and 8. In the eighth embodiment, the battery pack modules 60 and 70 are installed under a seat in the center of the vehicle body in order to secure a large space inside the vehicle 81 and a trunk room. However, the installation location of the battery pack modules 60 and 70 is not limited to the above location, and may be installed below the rear trunk room. Further, if the vehicle is not equipped with an engine, such as an EV or an FCV (fuel cell vehicle), it can be installed in front of a vehicle on which an engine is generally mounted.
[0074]
The present invention is not limited to the case where the battery pack is installed in the vehicle 81 in the form of the battery pack modules 60 and 70, and may be installed in the vehicle 81 in the form of the battery packs 40 and 50 depending on the intended use. Alternatively, the battery modules 60 and 70 and the battery modules 40 and 50 may be appropriately combined and installed in the vehicle 81. Further, as the vehicle 81 on which the laminated exterior batteries 10 and 30 according to the present invention can be installed, EV, HEV and FCV are preferable, but not limited thereto.
[0075]
Next, the number of assembled batteries 40 and 50 that constitute the assembled battery module will be described from the viewpoint of satisfying the voltage required for the power source of the vehicle 81.
[0076]
The operating voltage of one of the laminated exterior batteries 10 and 30 is 3.5 V (volt), and four of the laminated exterior batteries 10 and 30 are connected in series to the illustrated assembled batteries 40 and 50.
[0077]
Since the voltage of a general automobile power supply is 12 V, only one battery pack 40 or 50 needs to be used to supply the voltage.
[0078]
When the voltage of the vehicle power supply is increased to 42 V in order to cope with an increase in power consumption of the vehicle, an assembled battery module in which three assembled batteries 40 and 50 are connected in series may be used to supply the voltage. Just fine.
[0079]
In addition, in order to supply a voltage used for EVs and HEVs that are currently widely used, an assembled battery module in which 24 assembled batteries 40 and 50 are connected in series may be used.
[0080]
Thus, the number of battery packs 40 and 50 connected in series is determined according to the specifications of the power source of the vehicle 81. The illustrated assembled batteries 40 and 50 have four laminated exterior batteries 10 and 30 connected in series. Therefore, if the number of these assembled batteries 40 and 50 is changed in series, the voltage required in the vehicle 81 can be easily supplied. can do.
[Brief description of the drawings]
FIG. 1A is a plan view showing a laminated battery according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line 1B-1B in FIG. FIG. 4 is a schematic cross-sectional view showing a seal portion formed by a pair of laminated films.
FIG. 2 is a view showing an experimental result of examining a relationship between a width dimension of a seal portion and a water penetration amount.
FIG. 3 is a view showing a second embodiment of the present invention, and is a front view showing a state in which the laminated external batteries according to the first embodiment are stacked.
FIG. 4A is a cross-sectional view illustrating a main part of a laminated battery according to a third embodiment of the present invention, and FIG. 4B is a cross-sectional view illustrating a seal formed by a pair of laminated films. FIG.
FIG. 5A is a perspective view showing a battery pack according to a fourth embodiment of the present invention, and FIG. 5B is a perspective view showing the battery pack viewed from the side. is there.
FIG. 6A is a perspective view showing a battery pack according to a fifth embodiment of the present invention, and FIG. 6B is a perspective view showing the battery pack viewed from the side. is there.
FIG. 7 is a perspective view showing an assembled battery module according to a sixth embodiment of the present invention.
FIG. 8 is a perspective view showing an assembled battery module according to a seventh embodiment of the present invention.
FIG. 9 is a view showing a vehicle according to an eighth embodiment in which the laminated exterior battery according to the present invention is used for a vehicle-mounted battery.
[Explanation of symbols]
10, 30 ... Laminated battery
11, 31… Laminated film
11a, 31a: outer peripheral edge of laminate film
12, 32 ... seal part
13, 33 ... seal layer
16, 36 ... Battery body
17, 18, 37, 38 ... electrode lead
20 ... air passage
39 ... water collecting agent
40, 50 ... battery pack
41, 51 ... Battery storage case
42 ... Positive terminal
43 ... negative electrode terminal
60, 70 ... Battery module
61 ... External negative terminal
62 ... External positive terminal
80… In-vehicle battery
81… Vehicle
W: width of seal

Claims (10)

A laminate film having a seal layer forming a seal portion,
A battery body covered with the laminate film obtained by joining the seal layers,
One end is electrically connected to the battery main body, and the other end has an electrode lead projecting outside from an outer peripheral edge of the laminate film,
The width | variety dimension of the said sealing part from the outer periphery of the said laminated film is 10 mm or more, The laminated armored battery characterized by the above-mentioned. The laminated battery according to claim 1, wherein the seal portion has a function as a fin for heat dissipation. A laminate film having a seal layer forming a seal portion,
A battery body covered with the laminate film obtained by joining the seal layers,
One end is electrically connected to the battery main body, and the other end has an electrode lead projecting outside from an outer peripheral edge of the laminate film,
Has,
The laminate film, in the resin forming the seal layer, contains a moisture collector,
A laminate-packaged battery, wherein the compounding ratio of the moisture collector in the seal layer is varied along a width direction of the seal portion from an outer peripheral edge of the laminate film. 4. The laminated battery according to claim 3, wherein the mixing ratio of the moisture collector is larger on the outer peripheral side than on the battery main body side. 5. The laminated battery according to claim 3, wherein the water collecting agent is formed of silica gel, zeolite, or activated carbon powder. A plurality of the laminated exterior batteries according to claim 1 are electrically connected in parallel and / or in series, and are housed in a battery housing case such that the seals are exposed to the outside, and the seals are exposed to the outside. Characterized by having a function as a fin for heat dissipation. A battery pack comprising a plurality of the laminated exterior batteries according to claim 3 electrically connected in parallel and / or series and housed in a battery housing case. The electrode leads of the laminate-packaged battery are electrically connected to each other by ultrasonic welding, heat welding, laser welding, riveting, or caulking. Battery pack. An assembled battery module comprising a plurality of the assembled batteries according to claim 6 electrically connected in parallel and / or in series. The laminated exterior battery according to claim 1 or 3, wherein the battery is used for a vehicle-mounted battery.

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