JP4395905B2 - Collective battery and method for manufacturing the same - Google Patents

Collective battery and method for manufacturing the same Download PDF

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JP4395905B2
JP4395905B2 JP04543399A JP4543399A JP4395905B2 JP 4395905 B2 JP4395905 B2 JP 4395905B2 JP 04543399 A JP04543399 A JP 04543399A JP 4543399 A JP4543399 A JP 4543399A JP 4395905 B2 JP4395905 B2 JP 4395905B2
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battery case
batteries
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JP2000243370A (en
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豊彦 江藤
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Toyota Motor Corp
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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
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Description

【０００１】
【発明の属する技術分野】
本発明は、集合電池およびその製造方法に関し、詳しくは、複数の電池を直列に接続してなる集合電池およびその製造方法に関する。
【０００２】
【従来の技術】
従来、この種の集合電池としては、樹脂によって形成された電池ケースの電池の電極に近い外部に凹部を設け、この凹部に温度計を設置してなるものが提案されている。電池にはその特性に応じて適正な温度範囲が設定されているのが通例である。この温度範囲外で電池を使用すると電池を効率よく使用することができなかったり、全く動作しなかったり、あるいは温度にもよるが電池によっては破損してしまう場合もある。このため、提案の集合電池は、電池の温度管理が行なえるよう電池の温度を検出できるものとしている。
【０００３】
【発明が解決しようとする課題】
しかしながら、提案の集合電池では、電池の温度を正確に検出することができないという問題があった。樹脂は熱伝導性が低いから、電極と温度計とに温度差が生じ、電池の正確な温度を検出することができない。こうした問題に対して、樹脂が介在することにより生じる電極の温度と温度計により計測された温度との差を考慮するものも考えられるが、電池が温度変化したときには、検出される温度がその変化に追従することができないという問題は解決されない。
【０００４】
集合電池の内部に温度計を直接設置すれば上述の問題は解決できるが、密閉構造を採用する集合電池では温度計の取り付け部分のシールを考慮する必要から、その構造が複雑になると共に部品数も増加するという新たな問題が生じる。
【０００５】
本発明の集合電池は、部品数を増加することなく、簡易に、より正確に集合電池内部の温度を検出することを目的とする。また、本発明の集合電池の製造方法は、より正確に内部の温度を検出可能な集合電池の製造方法を提供することを目的とする。更に、本発明の電池ケースの製造方法は、より正確に内部の温度を検出可能な集合電池に用いられる電池ケースの製造方法を提供することを目的とする。
【０００６】
【課題を解決するための手段およびその作用・効果】
本発明の集合電池は、上述の目的の少なくとも一部を達成するために以下の手段を採った。
【０００７】
本発明の集合電池は、複数の電池を直列に接続してなる集合電池であって、前記複数の電池の隣接する電池間を区画する隔壁を有し該複数の電池を収納する電池ケースと、該電池ケースの前記隔壁に配置され前記隣接する電池の電極を電気的に接続する電極接続体と、熱伝導性に優れた材料により形成され前記電極接続体に当接する当接部と前記電池ケースの外部に露出する露出部とを有する熱伝導体とを備えることを要旨とする。
【０００８】
この本発明の集合電池では、熱伝導性に優れた材料により形成された熱伝導体を電極接続体に当接させることにより集合電池内部の温度を電池ケースの外部に伝達する。したがって、電池ケース外部に露出した熱伝導体の露出部にサーミスタなどの温度検出手段を取り付けることにより、集合電池内部の温度を検出することができる。しかも、熱伝導体は熱伝導に優れるから、集合電池の内部に温度変化が生じても、この温度変化を素早く電池ケース外部に伝達することができる。
【０００９】
こうした本発明の集合電池において、前記電極接続体は二つの部材からなり、前記熱伝導体は前記当接部が前記電極接続体の二つの部材に挟持された状態で該電極接続体と当接してなるものとすることもできる。こうすれば、熱伝導体と電極接続体との接触面積を大きくすることができるから、熱伝導体への熱伝導を促進することができる。なお、「当接」には、ボルトによって圧着させるものが含まれる他、溶接により熱伝導体と電極接続体とを一体のものとするものも含まれる。
【００１０】
本発明の第１の集合電池の製造方法は、複数の電池を直列に接続してなる集合電池の製造方法であって、前記複数の電池を収容し隣接する電池を区画する隔壁に該隣接する電池を電気的に接続するための接続孔を有すると共に前記隔壁に該接続孔と外部とを貫通する貫通孔とを有する電池ケースを樹脂により形成するケース形成工程と、前記電池ケースの隔壁に形成された貫通孔と連通する連通孔を有する前記電池ケースの蓋を前記電池ケースと同一の樹脂により形成するケース蓋形成工程と、前記電池ケースに前記複数の電池を組み付ける電池組付工程と、熱伝導性に優れた材料により形成され前記蓋と前記電池ケースとを接合したときに該蓋の連絡孔を通って前記接続孔から該蓋の外部に至る熱伝導体を前記貫通孔に挿入する熱伝導体挿入工程と、該挿入された熱伝導体の前記接続孔に至った部分の少なくとも一部を挟持する状態で隣接する電池の電極を電気的に接続する電極接続体を組み付ける電極接続体組付工程と、前記蓋を前記電池ケースに組み付ける蓋組付工程とを備えることを要旨とする。
【００１１】
本発明の第１の集合電池の製造方法によれば、電極接続体に挟持されその一部が外部に露出する熱伝導体を備える集合電池を製造することができる。こうして製造された集合電池は、熱伝導体が集合電池内部の温度を電池ケース外部に伝達するから、この熱伝導体にサーミスタなどの温度検出手段を取り付けることにより、集合電池内部の温度を検出することができる。ここで、熱伝導体挿入工程は、電池組付工程の後に行なう他、電池組付工程に先立って行なってもよく、あるいは電池組付工程と平行して行なってもよい。電極接続体組付工程は、熱伝導体挿入工程の後であって電池組付工程における電極の組み付けの後であれば何時でも行なうことができるから、電池組付工程のすべてが行なわれた後に行なう必要はない。また、電極接続体組付工程における組み付けには、ボルトによる組み付けが含まれる他、溶接により熱伝導体と電極接続体とを一体のものとする組み付けも含まれる。蓋組付工程における組み付けには、ボルトによる組み付けが含まれる他、蓋を電池ケースに熱容着させる組み付けも含まれる。
【００１４】
本発明の第２の集合電池の製造方法は、複数の電池を直列に接続してなる集合電池の製造方法であって、樹脂により形成され、複数の電池を収容すると共に隣接する電池の電極を電気的に接続可能な電池ケースの製造方法において、射出成形により前記電池ケースを形成するための型を形成する型形成工程と、該形成された型の前記隣接する電池の電極を電気的に接続する部位に、一部が前記電池ケースの外部に突出するよう熱伝導性に優れた材料により形成された熱伝導体を配置する熱伝導体配置工程と、該熱伝導体が配置された型に樹脂を射出して前記電池ケースを形成するケース形成工程とを備える電池ケースの製造方法により製造された電池ケースに前記複数の電池を組み付ける電池組付工程と、前記熱伝導体の一部を挟持する状態で隣接する電池の電極を電気的に接続する電極接続体を組み付ける電極接続体組付工程と、前記電池ケースと同一の樹脂により形成され、前記熱伝導体を外部に露出させる貫通孔が形成された蓋を前記電池ケースに組み付ける蓋組付工程とを備えることを要旨とする。
【００１５】
本発明の第２の集合電池の製造方法によれば、電極接続体に挟持されその一部が外部に露出する熱伝導体を備える集合電池を製造することができる。こうして製造された集合電池は、熱伝導体が集合電池内部の温度を電池ケース外部に伝達するから、この熱伝導体にサーミスタなどの温度検出手段を取り付けることにより、集合電池内部の温度を検出することができる。ここで、電極接続体組付工程は、電池組付工程における電極の組み付けの後であれば何時でも行なうことができるから、電池組付工程のすべてが行なわれた後に行なう必要はない。また、電極接続体組付工程における組み付けには、ボルトによる組み付けが含まれる他、溶接により熱伝導体と電極接続体とを一体のものとする組み付けも含まれる。さらに、蓋組付工程における組み付けには、ボルトによる組み付けが含まれる他、蓋を電池ケースに熱容着させる組み付けも含まれる。また、上記電池ケースの製造方法によれば、射出成形の際の電池ケースの型に熱伝導体を配置するから、電池ケースと熱伝導体とを一体のものとして形成することができる。
【００１６】
【発明の実施の形態】
次に、本発明の実施の形態を実施例を用いて説明する。図１は本発明の一実施例である集合電池２０の概略の構成を示す分解斜視図である。図示するように、実施例の集合電池２０は、電池ケース３０と、電池ケース３０に収納される複数の電池５０と、電池ケース３０の蓋をなすケースフタ４０とを備える。
【００１７】
電池ケース３０は、エンジニアリングプラスティックなどの樹脂により形成されており、内側に形成された複数の隔壁３４により複数の電池５０を収納する収納部３２が形成されている。隔壁３４の中央の上部には、貫通孔となる集電板接続部３６が形成されており、この集電板接続部３６を遮るように導電性を有し熱伝導性の優れた材料（例えば、鉄やニッケルなど）により形成された熱伝導部材７８が嵌挿されている。この集電板接続部３６では、隣接する電池５０の電極が電気的に接続されるが、この接続については後述する。
【００１８】
ケースフタ４０も電池ケース３０と同一の樹脂で形成されており、電池ケース３０の隔壁３４に嵌挿された熱伝導部材７８に相当する部位に貫通孔４２が形成されている。したがって、ケースフタ４０が電池ケース３０に取り付けられたときには、熱伝導部材７８の一部が貫通孔４２を貫通してケースフタ４０の上面に突出するようになっている。なお、ケースフタ４０の電池ケース３０への組み付けは、各電池５０が密閉構造となるように熱容着により組み付けられる。
【００１９】
電池５０は、ニッケル水素電池として構成されており、複数の陽極５２と、この複数の陽極５２と交互に配置される複数の陰極６２と、複数の陽極５２の端部（図１中左側）に接続された陽極側集電板５４と、複数の陰極６２の端部（図１中右側）に接続された陰極側集電板６４と、図示しない電解液とから構成されている。陽極側集電板５４と陰極側集電板６４の中央上部には、隣接する電池５０の陰極側集電板６４または陽極側集電板５４と二つの集電板接続体７０により電気的に接続される接続部５６，６６が形成されている。なお、集電板接続体７０は、導電性に優れた材料（例えば、鉄やニッケルなど）で形成されており、集電板接続部３６に若干のクリアランスを持って集電板接続部３６に嵌合する凸部７２が形成されている。
【００２０】
図２は、組み付け後の集合電池２０の図１中のＡ−Ｂ断面の隔壁３４の部分を拡大して示す拡大断面図である。図示するように、熱伝導部材７８は、二つの集電板接続体７０により挟持されており、二つの集電板接続体７０の凸部７２に当接している。二つの集電板接続体７０は、陽極側集電板５４と陰極側集電板６４とに挟持されており、全体として５層のサンドイッチ構造を形成している。実施例では、このサンドイッチ構造を押圧した状態で抵抗溶接により溶接している。したがって、各部材の接触面での電気抵抗は小さなものとなっている。熱伝導部材７８の一部はケースフタ４０の貫通孔４２を貫通して外部に突出している。熱伝導部材７８は、前述したように熱伝導率に優れた材料により形成されているから、その外部に突出した部分にサーミスタなどの温度検出器を取り付ければ、集合電池２０内部の温度を検出することができる。しかも、集合電池２０内部に温度変化が生じても、その温度変化に迅速に追従するから、集合電池２０内部の温度をより正確に検出することができる。なお、集電板接続体７０の凸部７２を形成した側の縁近辺にはＯリング７６を配置するための溝７４が形成されており、ここにＯリング７６を配置して電池ケース３０の隔壁３４に押圧することにより各収納部３２を密閉している。
【００２１】
次に、こうした実施例の集合電池２０の製造の様子について説明する。図３は、実施例の集合電池２０の製造工程の一例を示す製造工程図である。集合電池２０の製造は、まず電池ケース３０を準備する工程（工程Ｓ１０）から始まる。この工程は、電池ケース３０の製造工程と同意であり、図４に例示する電池ケース３０の製造工程により準備（製造）がなされる。説明のため、図３の集合電池２０の製造工程の説明を中断して、図４の電池ケース３０の製造工程についてここで説明する。
【００２２】
電池ケース３０の製造は、まず電池ケース３０の型を形成する工程から始まる（工程Ｓ２０）。電池ケース３０は、前述したように樹脂により形成されるから、ここで言う電池ケース３０の型は射出成形用の型である。次に電池ケース３０の型の隔壁３４の中央上部に相当する部位に熱伝導部材７８を配置する（工程Ｓ２２）。続いて、この熱伝導部材７８を配置した状態を保って樹脂を型に射出して電池ケース３０を形成し（工程Ｓ２４）、電池ケース３０を完成する。このように熱伝導部材７８を配置した状態を保って電池ケース３０を射出成形するから、熱伝導部材７８を電池ケース３０と一体のものとすることができる。
【００２３】
図３の集合電池２０の製造工程に戻る。こうして電池ケース３０を形成し準備すると、次に、この電池ケース３０の各収納部３２に電池５０の組み付け（工程Ｓ１２）、集電板接続体７０を配置して抵抗溶接により上述の陰極側集電板６４，集電板接続体７０，熱伝導部材７８，集電板接続体７０，陽極側集電板５４からなるサンドイッチ構造を一体のものとする（工程Ｓ１４）。そして、ケースフタ４０を電池ケース３０に被せてその接触面を熱容着により容着して（工程Ｓ１６）、実施例の集合電池２０を完成する。
【００２４】
以上説明した実施例の集合電池２０によれば、熱伝導率に優れた材料により形成された熱伝導部材７８を集合電池２０内部で集電板接続体７０と一体のものとし、その一部を集合電池２０の外部に突出させているから、この突出した部分を介して集合電池２０内部の温度を検出することができる。しかも、集合電池２０内部に温度変化が生じても、熱伝導部材７８はその温度変化に迅速に追従するから、集合電池２０内部の温度をより正確に検出することができる。
【００２５】
また、実施例の集合電池２０の製造方法によれば、上述の効果を奏する集合電池２０を製造することができる。しかも、電池ケース３０の型に熱伝導部材７８を配置した状態で電池ケース３０を射出成形するから、熱伝導部材７８を電池ケース３０と一体のものとすることができる。
【００２６】
実施例の集合電池２０では、電池５０をニッケル水素電池として構成したが、他の如何なる電池として構成してもよい。
【００２７】
実施例の集合電池２０の製造方法では、電池５０を組み付けた後に熱伝導部材７８や集電板接続体７０などを溶接するものとしたが、電池５０の組み付けのうち一体のものとされる複数の陽極５２と陽極側集電板５４および複数の陰極６２と陰極側集電板６４を組み付けた後であれば熱伝導部材７８や集電板接続体７０などの溶接は行なえるから、電池５０を完全に組み付ける前に熱伝導部材７８や集電板接続体７０の溶接を行なうものとしてもよい。
【００２８】
また、実施例の集合電池２０の製造方法では、熱伝導部材７８や集電板接続体７０を抵抗溶接により一体のものとしたが、ボルトなどにより締め付けるものとしても差し支えない。
【００２９】
さらに、実施例の集合電池２０の製造方法では、熱伝導部材７８を電池ケース３０の型に配置して電池ケース３０を射出成形するものとしたが、電池ケースに熱伝導部材を挿入する挿入孔を形成するものとして射出成形し、これに熱伝導部材を挿入するものとしてもよい。この場合の集合電池の製造工程の一例を図５に示す。この製造工程では、まず、熱伝導部材を挿入するための貫通孔を形成するための型を用いて電池ケースを射出成形すると共に（工程Ｓ３０）、同様にケースフタを射出成形する（工程Ｓ３２）。次に、電池ケースの収納部に電池を組み付けると共に（工程Ｓ３４）、電池ケースの隔壁に形成された挿入孔に熱伝導部材を挿入する（工程Ｓ３６）。そして、熱伝導部材や集電板接続体などによるサンドイッチ構造を溶接し（工程Ｓ３８）、ケースフタを熱容着して（工程Ｓ４０）、集合電池を完成する。こうすれば、電池ケースの射出成形の際に熱伝導部材を配置しないから、電池ケースを容易に形成することができる。
【００３０】
なお、こうした変形例の集合電池の製造方法では、電池ケースに熱伝導部材を挿入するための挿入孔を形成したが、こうした挿入孔を形成せず、熱伝導部材を圧入するものとしてもよい。
【００３１】
以上、本発明の実施の形態について実施例を用いて説明したが、本発明はこうした実施例に何等限定されるものではなく、本発明の要旨を逸脱しない範囲内において、種々なる形態で実施し得ることは勿論である。
【図面の簡単な説明】
【図１】 本発明の一実施例である集合電池２０の概略の構成を示す分解斜視図である。
【図２】 組み付け後の集合電池２０の図１中のＡ−Ｂ断面の隔壁３４の部分を拡大して示す拡大断面図である。
【図３】 実施例の集合電池２０の製造の様子を例示する製造工程図である。
【図４】 実施例の集合電池２０に用いられる電池ケース３０の製造の様子を例示する製造工程図である。
【図５】 変形例の集合電池の製造の様子を例示する製造工程図である。
【符号の説明】
２０ 集合電池、３０ 電池ケース、３２ 収納部、３４ 隔壁、３６ 集電板接続部、４０ ケースフタ、４２ 貫通孔、５０ 電池、５２ 陽極、５４ 陽極側集電板、５６ 接続部、６２ 陰極、６４ 陰極側集電板、６６ 接続部、７０ 集電板接続体、７２ 凸部、７４ 溝、７６ Ｏリング、７８ 熱伝導部材。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembled battery and a method for manufacturing the same, and more particularly to an assembled battery formed by connecting a plurality of batteries in series and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, as this type of assembled battery, a battery case in which a recess is provided outside the battery electrode of a battery case made of resin and a thermometer is installed in the recess is proposed. In general, an appropriate temperature range is set for a battery in accordance with its characteristics. If the battery is used outside this temperature range, the battery may not be used efficiently, may not operate at all, or may be damaged depending on the temperature. For this reason, the proposed assembled battery can detect the temperature of the battery so that the battery temperature can be controlled.
[0003]
[Problems to be solved by the invention]
However, the proposed assembled battery has a problem that the temperature of the battery cannot be accurately detected. Since the resin has low thermal conductivity, a temperature difference occurs between the electrode and the thermometer, and the accurate temperature of the battery cannot be detected. To deal with these problems, the difference between the electrode temperature caused by the resin and the temperature measured by the thermometer can be considered. However, when the battery temperature changes, the detected temperature changes. The problem of not being able to follow is not solved.
[0004]
The above-mentioned problem can be solved by installing a thermometer directly inside the assembled battery. However, in an assembled battery that employs a sealed structure, it is necessary to consider the seal of the thermometer mounting part, making the structure complicated and the number of parts A new problem arises.
[0005]
An object of the assembled battery of the present invention is to easily and more accurately detect the temperature inside the assembled battery without increasing the number of parts. Moreover, the manufacturing method of the assembled battery of this invention aims at providing the manufacturing method of the assembled battery which can detect an internal temperature more correctly. Furthermore, the manufacturing method of the battery case of this invention aims at providing the manufacturing method of the battery case used for the assembled battery which can detect an internal temperature more correctly.
[0006]
[Means for solving the problems and their functions and effects]
The assembled battery of the present invention employs the following means in order to achieve at least a part of the above object.
[0007]
The assembled battery of the present invention is an assembled battery formed by connecting a plurality of batteries in series, and has a partition that partitions between adjacent batteries of the plurality of batteries, and a battery case that houses the batteries. An electrode connector that is disposed on the partition wall of the battery case and electrically connects the electrodes of the adjacent battery, an abutting portion that is formed of a material having excellent heat conductivity and contacts the electrode connector, and the battery case And a heat conductor having an exposed portion exposed to the outside.
[0008]
In the assembled battery of the present invention, the temperature inside the assembled battery is transmitted to the outside of the battery case by bringing a thermal conductor formed of a material having excellent thermal conductivity into contact with the electrode connector. Therefore, the temperature inside the assembled battery can be detected by attaching temperature detecting means such as a thermistor to the exposed portion of the heat conductor exposed outside the battery case. And since a heat conductor is excellent in heat conduction, even if a temperature change arises inside an assembled battery, this temperature change can be quickly transmitted outside a battery case.
[0009]
In such an assembled battery of the present invention, the electrode connection body is composed of two members, and the heat conductor is in contact with the electrode connection body in a state where the contact portion is sandwiched between the two members of the electrode connection body. It can also be. By so doing, the contact area between the heat conductor and the electrode connector can be increased, and therefore heat conduction to the heat conductor can be promoted. Note that the “contact” includes not only those which are pressure-bonded by bolts but also those in which the heat conductor and the electrode connection body are integrated by welding.
[0010]
The first assembled battery manufacturing method of the present invention is an assembled battery manufacturing method in which a plurality of batteries are connected in series, and is adjacent to a partition wall that accommodates the plurality of batteries and partitions adjacent batteries. Forming a battery case having a connection hole for electrically connecting a battery and having a through hole penetrating the connection hole and the outside in the partition wall; and forming the battery case in the partition wall of the battery case A case lid forming step of forming a lid of the battery case having a communication hole communicating with the formed through hole with the same resin as the battery case, a battery assembling step of assembling the plurality of batteries to the battery case, and a heat Heat that is formed of a material having excellent conductivity and that inserts a thermal conductor from the connection hole to the outside of the lid through the connection hole of the lid when the lid and the battery case are joined to each other. Conductor insertion And an electrode connector assembly step for assembling an electrode connector for electrically connecting the electrodes of adjacent batteries in a state of sandwiching at least a part of the portion reaching the connection hole of the inserted thermal conductor; And a lid assembly step for assembling the lid to the battery case.
[0011]
According to the first method for producing an assembled battery of the present invention, it is possible to produce an assembled battery including a heat conductor that is sandwiched between electrode connectors and a part of which is exposed to the outside. In the assembled battery manufactured in this way, the thermal conductor transmits the temperature inside the assembled battery to the outside of the battery case. By attaching temperature detecting means such as a thermistor to this thermal conductor, the temperature inside the assembled battery is detected. be able to. Here, the heat conductor inserting step may be performed prior to the battery assembling step, or may be performed in parallel with the battery assembling step, in addition to the battery assembling step. Since the electrode assembly assembly process can be performed at any time after the heat conductor insertion process and after the electrode assembly in the battery assembly process, after all the battery assembly processes have been performed. There is no need to do it. In addition, the assembly in the electrode connector assembly process includes assembly by bolts, and also includes assembly in which the heat conductor and the electrode connector are integrated by welding. The assembly in the lid assembly process includes assembly with bolts, and also includes assembly in which the lid is heat-fitted to the battery case.
[0014]
A second assembled battery manufacturing method of the present invention is a method of manufacturing an assembled battery in which a plurality of batteries are connected in series, which is formed of a resin, accommodates a plurality of batteries, and has electrodes of adjacent batteries. In a method for manufacturing an electrically connectable battery case, a mold forming step of forming a mold for forming the battery case by injection molding and an electrode of the adjacent battery of the formed mold are electrically connected A heat conductor disposing step of disposing a heat conductor formed of a material having excellent heat conductivity so that a part protrudes to the outside of the battery case, and a mold in which the heat conductor is disposed A battery assembly step of assembling the plurality of batteries in a battery case manufactured by a battery case manufacturing method comprising: a case forming step of injecting resin to form the battery case; and sandwiching a part of the heat conductor State An electrode connector assembly step for assembling an electrode connector for electrically connecting the electrodes of adjacent batteries, and a through hole that is formed of the same resin as the battery case and exposes the heat conductor to the outside And a lid assembling step for assembling the lid to the battery case.
[0015]
According to the second method for producing an assembled battery of the present invention, it is possible to produce an assembled battery including a heat conductor that is sandwiched between electrode connectors and a part of which is exposed to the outside. In the assembled battery manufactured in this way, the thermal conductor transmits the temperature inside the assembled battery to the outside of the battery case. By attaching temperature detecting means such as a thermistor to this thermal conductor, the temperature inside the assembled battery is detected. be able to. Here, the electrode assembly assembly step can be performed at any time after the assembly of the electrodes in the battery assembly step, and therefore does not have to be performed after all the battery assembly steps are performed. In addition, the assembly in the electrode connector assembly process includes assembly by bolts, and also includes assembly in which the heat conductor and the electrode connector are integrated by welding. Furthermore, the assembly in the lid assembly process includes assembly by bolts, and also includes assembly in which the lid is heat-fitted to the battery case. Further, according to the battery case manufacturing method, since the heat conductor is disposed in the battery case mold during injection molding, the battery case and the heat conductor can be integrally formed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described using examples. FIG. 1 is an exploded perspective view showing a schematic configuration of an assembled battery 20 according to an embodiment of the present invention. As illustrated, the assembled battery 20 according to the embodiment includes a battery case 30, a plurality of batteries 50 housed in the battery case 30, and a case lid 40 that forms a lid of the battery case 30.
[0017]
The battery case 30 is formed of a resin such as engineering plastic, and a storage portion 32 that stores a plurality of batteries 50 is formed by a plurality of partition walls 34 formed inside. A current collector plate connecting portion 36 serving as a through hole is formed at the center upper portion of the partition wall 34, and a material having conductivity and excellent thermal conductivity so as to block the current collector plate connecting portion 36 (for example, A heat conducting member 78 made of iron, nickel or the like is inserted. In the current collector plate connecting portion 36, the electrodes of the adjacent batteries 50 are electrically connected. This connection will be described later.
[0018]
The case lid 40 is also formed of the same resin as the battery case 30, and a through hole 42 is formed at a portion corresponding to the heat conducting member 78 fitted into the partition wall 34 of the battery case 30. Therefore, when the case lid 40 is attached to the battery case 30, a part of the heat conducting member 78 penetrates the through hole 42 and protrudes from the upper surface of the case lid 40. The case lid 40 is assembled to the battery case 30 by heat-sealing so that each battery 50 has a sealed structure.
[0019]
The battery 50 is configured as a nickel metal hydride battery, and includes a plurality of anodes 52, a plurality of cathodes 62 alternately arranged with the plurality of anodes 52, and ends of the plurality of anodes 52 (left side in FIG. 1). The anode side current collecting plate 54 is connected, the cathode side current collecting plate 64 is connected to the ends of the plurality of cathodes 62 (on the right side in FIG. 1), and an electrolyte solution (not shown). The anode-side current collector plate 54 and the cathode-side current collector plate 64 are electrically connected to the center upper portion of the adjacent battery 50 by the cathode-side current collector plate 64 or the anode-side current collector plate 54 and the two current collector plate connectors 70. Connection portions 56 and 66 to be connected are formed. The current collector plate connection body 70 is formed of a material having excellent conductivity (for example, iron or nickel), and the current collector plate connection portion 36 has a slight clearance with respect to the current collector plate connection portion 36. A convex portion 72 to be fitted is formed.
[0020]
FIG. 2 is an enlarged cross-sectional view showing a part of the partition wall 34 of the cross section AB in FIG. 1 of the assembled battery 20 after assembly. As shown in the drawing, the heat conducting member 78 is sandwiched between the two current collector plate connectors 70 and abuts against the convex portions 72 of the two current collector plate connectors 70. The two current collector plate connectors 70 are sandwiched between the anode side current collector plate 54 and the cathode side current collector plate 64 to form a five-layer sandwich structure as a whole. In the embodiment, this sandwich structure is welded by resistance welding in a pressed state. Therefore, the electrical resistance at the contact surface of each member is small. A part of the heat conducting member 78 penetrates the through hole 42 of the case lid 40 and protrudes to the outside. Since the heat conducting member 78 is formed of a material having excellent heat conductivity as described above, the temperature inside the assembled battery 20 is detected if a temperature detector such as a thermistor is attached to a portion protruding to the outside. be able to. In addition, even if a temperature change occurs in the assembled battery 20, the temperature rapidly follows the temperature change, so that the temperature inside the assembled battery 20 can be detected more accurately. A groove 74 for placing an O-ring 76 is formed in the vicinity of the edge on the side where the convex portion 72 of the current collector plate connecting body 70 is formed. Each storage portion 32 is sealed by pressing against the partition wall 34.
[0021]
Next, how the assembled battery 20 according to the embodiment is manufactured will be described. FIG. 3 is a manufacturing process diagram showing an example of a manufacturing process of the assembled battery 20 of the embodiment. The manufacturing of the assembled battery 20 starts from a step of preparing the battery case 30 (step S10). This process is the same as the manufacturing process of the battery case 30 and is prepared (manufactured) by the manufacturing process of the battery case 30 illustrated in FIG. For the sake of explanation, the description of the manufacturing process of the assembled battery 20 of FIG. 3 is interrupted, and the manufacturing process of the battery case 30 of FIG. 4 will now be described.
[0022]
The manufacture of the battery case 30 starts from a step of forming a mold of the battery case 30 (step S20). Since the battery case 30 is formed of resin as described above, the mold of the battery case 30 referred to here is a mold for injection molding. Next, the heat conduction member 78 is disposed at a portion corresponding to the upper center of the partition wall 34 of the battery case 30 (step S22). Subsequently, the resin case is injected into the mold while the heat conducting member 78 is arranged to form the battery case 30 (step S24), and the battery case 30 is completed. Thus, since the battery case 30 is injection-molded while maintaining the state where the heat conducting member 78 is disposed, the heat conducting member 78 can be integrated with the battery case 30.
[0023]
Returning to the manufacturing process of the assembled battery 20 of FIG. When the battery case 30 is formed and prepared in this manner, the battery 50 is assembled (step S12) in each storage portion 32 of the battery case 30 and the current collector plate connector 70 is disposed, and the above-described cathode-side current collection is performed by resistance welding. A sandwich structure including the electric plate 64, the current collector plate connection body 70, the heat conducting member 78, the current collector plate connection body 70, and the anode side current collector plate 54 is integrated (step S14). Then, the case cover 40 is put on the battery case 30 and the contact surface is attached by heat welding (step S16), thereby completing the assembled battery 20 of the embodiment.
[0024]
According to the assembled battery 20 of the embodiment described above, the heat conducting member 78 formed of a material having excellent heat conductivity is integrated with the current collector plate connection body 70 inside the assembled battery 20, and a part of the heat conducting member 78 is formed. Since it protrudes to the outside of the assembled battery 20, the temperature inside the assembled battery 20 can be detected through this protruding portion. In addition, even if a temperature change occurs in the assembled battery 20, the heat conducting member 78 quickly follows the temperature change, so that the temperature inside the assembled battery 20 can be detected more accurately.
[0025]
Moreover, according to the manufacturing method of the assembled battery 20 of an Example, the assembled battery 20 which has the above-mentioned effect can be manufactured. In addition, since the battery case 30 is injection-molded in a state where the heat conducting member 78 is disposed in the mold of the battery case 30, the heat conducting member 78 can be integrated with the battery case 30.
[0026]
In the assembled battery 20 of the embodiment, the battery 50 is configured as a nickel metal hydride battery, but may be configured as any other battery.
[0027]
In the manufacturing method of the assembled battery 20 of the embodiment, the heat conductive member 78 and the current collector plate connection 70 are welded after the battery 50 is assembled. Since the anode 52 and the anode-side current collector 54 and the plurality of cathodes 62 and the cathode-side current collector 64 are assembled, the heat conducting member 78 and the current collector plate connector 70 can be welded. It is also possible to weld the heat conducting member 78 and the current collector plate connecting body 70 before completely assembling.
[0028]
Moreover, in the manufacturing method of the assembled battery 20 of an Example, although the heat conductive member 78 and the current collection board connection body 70 were integrated by resistance welding, it does not interfere as what clamp | tightens with a volt | bolt etc.
[0029]
Furthermore, in the manufacturing method of the assembled battery 20 of the embodiment, the heat conducting member 78 is disposed in the mold of the battery case 30 and the battery case 30 is injection molded. However, the insertion hole for inserting the heat conducting member into the battery case is used. It is good also as what injects injection molding as what forms and inserts a heat conductive member in this. An example of the manufacturing process of the assembled battery in this case is shown in FIG. In this manufacturing process, first, a battery case is injection-molded using a mold for forming a through hole for inserting a heat conducting member (step S30), and a case lid is similarly injection-molded (step S32). Next, the battery is assembled in the battery case housing (step S34), and the heat conduction member is inserted into the insertion hole formed in the partition wall of the battery case (step S36). And the sandwich structure by a heat conductive member, a current collector plate connection body, etc. is welded (process S38), the case cover is heat-sealed (process S40), and an assembled battery is completed. By so doing, the battery case can be easily formed because the heat conducting member is not disposed during the injection molding of the battery case.
[0030]
In the modified battery manufacturing method according to the modified example, the insertion hole for inserting the heat conduction member is formed in the battery case. However, the heat conduction member may be press-fitted without forming the insertion hole.
[0031]
The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments, and can be implemented in various forms without departing from the gist of the present invention. Of course you get.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a schematic configuration of an assembled battery 20 according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a part of a partition wall 34 in the cross section AB in FIG. 1 of the assembled battery 20 after assembling.
FIG. 3 is a manufacturing process diagram illustrating a state of manufacturing the assembled battery 20 of the example.
FIG. 4 is a manufacturing process diagram illustrating a state of manufacturing a battery case 30 used in the assembled battery 20 of the example.
FIG. 5 is a manufacturing process diagram illustrating a state of manufacturing an assembled battery according to a modification.
[Explanation of symbols]
20 battery pack, 30 battery case, 32 housing, 34 partition, 36 current collector connection, 40 case lid, 42 through hole, 50 battery, 52 anode, 54 anode current collector, 56 connection, 62 cathode, 64 Cathode side current collecting plate, 66 connecting portion, 70 current collecting plate connecting body, 72 convex portion, 74 groove, 76 O-ring, 78 heat conducting member.

Claims (4)

複数の電池を直列に接続してなる集合電池であって、
前記複数の電池の隣接する電池間を区画する隔壁を有し、該複数の電池を収納する電池ケースと、
該電池ケースの前記隔壁に配置され、前記隣接する電池の電極を電気的に接続する電極接続体と、
熱伝導性に優れた材料により形成され、前記電極接続体に当接する当接部と前記電池ケースの外部に露出する露出部とを有する熱伝導体と
を備える集合電池。An assembled battery formed by connecting a plurality of batteries in series,
A battery case for partitioning adjacent batteries of the plurality of batteries, and storing the plurality of batteries;
An electrode connector disposed on the partition wall of the battery case and electrically connecting electrodes of the adjacent batteries;
A battery assembly comprising: a heat conductor formed of a material having excellent heat conductivity and having a contact portion that contacts the electrode connector and an exposed portion exposed to the outside of the battery case. 請求項１記載の集合電池であって、
前記電極接続体は、二つの部材からなり、
前記熱伝導体は、前記当接部が前記電極接続体の二つの部材に挟持された状態で該電極接続体と当接してなる
集合電池。The assembled battery according to claim 1,
The electrode connector comprises two members,
The heat conductor is formed by contacting the electrode connection body in a state where the contact portion is sandwiched between two members of the electrode connection body. 複数の電池を直列に接続してなる集合電池の製造方法であって、
前記複数の電池を収容し、隣接する電池を区画する隔壁に該隣接する電池を電気的に接続するための接続孔を有すると共に前記隔壁に該接続孔と外部とを貫通する貫通孔とを有する電池ケースを樹脂により形成するケース形成工程と、
前記電池ケースの隔壁に形成された貫通孔と連通する連通孔を有する前記電池ケースの蓋を前記電池ケースと同一の樹脂により形成するケース蓋形成工程と、
前記電池ケースに前記複数の電池を組み付ける電池組付工程と、
熱伝導性に優れた材料により形成され前記蓋と前記電池ケースとを接合したときに該蓋の連絡孔を通って前記接続孔から該蓋の外部に至る熱伝導体を前記貫通孔に挿入する熱伝導体挿入工程と、
該挿入された熱伝導体の前記接続孔に至った部分の少なくとも一部を挟持する状態で隣接する電池の電極を電気的に接続する電極接続体を組み付ける電極接続体組付工程と、
前記蓋を前記電池ケースに組み付ける蓋組付工程と
を備える集合電池の製造方法。A method for producing an assembled battery comprising a plurality of batteries connected in series,
The partition wall that houses the plurality of batteries and has a connection hole for electrically connecting the adjacent battery to the partition wall that partitions the adjacent battery, and the partition wall has a through hole that penetrates the connection hole and the outside. A case forming step of forming a battery case from a resin;
A case lid forming step of forming a lid of the battery case having a communication hole communicating with a through hole formed in a partition wall of the battery case, using the same resin as the battery case;
A battery assembly step of assembling the plurality of batteries in the battery case;
When the lid and the battery case are joined to each other and formed from a material having excellent thermal conductivity, a thermal conductor is inserted into the through-hole through the connection hole of the lid and from the connection hole to the outside of the lid. A heat conductor insertion step;
An electrode connector assembly step of assembling an electrode connector for electrically connecting the electrodes of adjacent batteries in a state of sandwiching at least a part of the portion of the inserted thermal conductor leading to the connection hole;
A battery assembly manufacturing method comprising: a lid assembly step of assembling the lid to the battery case. 複数の電池を直列に接続してなる集合電池の製造方法であって、
樹脂により形成され、複数の電池を収容すると共に隣接する電池の電極を電気的に接続可能な電池ケースの製造方法において、射出成形により前記電池ケースを形成するための型を形成する型形成工程と、該形成された型の前記隣接する電池の電極を電気的に接続する部位に、一部が前記電池ケースの外部に突出するよう熱伝導性に優れた材料により形成された熱伝導体を配置する熱伝導体配置工程と、該熱伝導体が配置された型に樹脂を射出して前記電池ケースを形成するケース形成工程とを備える電池ケースの製造方法により製造された電池ケースに前記複数の電池を組み付ける電池組付工程と、
前記熱伝導体の一部を挟持する状態で隣接する電池の電極を電気的に接続する電極接続体を組み付ける電極接続体組付工程と、
前記電池ケースと同一の樹脂により形成され、前記熱伝導体を外部に露出させる貫通孔が形成された蓋を前記電池ケースに組み付ける蓋組付工程と
を備える集合電池の製造方法。A method for producing an assembled battery comprising a plurality of batteries connected in series,
A mold forming step of forming a mold for forming the battery case by injection molding in a method of manufacturing a battery case formed of resin and accommodating a plurality of batteries and electrically connecting adjacent battery electrodes; A heat conductor formed of a material having excellent heat conductivity is disposed so that a part thereof protrudes outside the battery case at a portion where the electrodes of the adjacent battery of the formed mold are electrically connected. A battery case manufactured by a battery case manufacturing method , comprising: a heat conductor disposing step, and a case forming step of injecting resin into a mold in which the heat conductor is disposed to form the battery case. A battery assembly process for assembling the battery;
An electrode assembly assembling step for assembling an electrode connector for electrically connecting the electrodes of adjacent batteries in a state of sandwiching a part of the thermal conductor;
A battery assembly manufacturing method comprising: a lid assembly step of assembling the battery case with a lid formed of the same resin as the battery case and having a through hole that exposes the thermal conductor to the outside.
JP04543399A 1999-02-23 1999-02-23 Collective battery and method for manufacturing the same Expired - Fee Related JP4395905B2 (en)

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JP4692030B2 (en) * 2005-03-10 2011-06-01 日産自動車株式会社 Battery temperature detector
JP5061698B2 (en) 2006-07-19 2012-10-31 トヨタ自動車株式会社 Power storage device
JP2013038192A (en) * 2011-08-05 2013-02-21 Komatsu Ltd Power storage device, power storage device assembly, and manufacturing method of power storage device
DE102011087747B4 (en) 2011-12-05 2018-04-05 Continental Automotive Gmbh Energy storage system comprising an electrical energy storage and a temperature monitoring device
DE102018119051A1 (en) * 2018-08-06 2020-02-06 Webasto SE Battery case, battery system and assembly method for a battery system
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