JP2004071346A

JP2004071346A - Battery device and its manufacturing method

Info

Publication number: JP2004071346A
Application number: JP2002228872A
Authority: JP
Inventors: Kenji Senda; 仙田　謙治; Tokuji Kono; 河野　篤司
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2002-08-06
Filing date: 2002-08-06
Publication date: 2004-03-04
Anticipated expiration: 2022-08-06
Also published as: JP4300769B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery device which can be reduced in size irrespective of incorporating an overheat protective element. <P>SOLUTION: The battery device includes a cell battery 18 having an anode and a cathode, an overheat protective element 19 having a cell section 20 for cutting off current at the battery 18 overheating time and a pair of leads 21a, 21b provided at both sides of the section 20 and electrically connected to the battery 18, a protective circuit board 23 electrically connected to the battery 18 and controlling to charge or discharge at least the battery 18, and a housing 27 provided on the board 23 in such a manner that the section 20 in the element 19 is intruded into the housing 27. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
一般に電池は様々な機器に用いられており、近年、その中でも、携帯電話や、ノートパソコンと呼ばれる持ち運び可能なパーソナルコンピュータをはじめとする携帯端末の電源として用いられることが多くなってきた。
【０００２】
本発明は、このような携帯端末をはじめとする電気機器または電子機器に用いられる電池装置およびその製造方法に関するものである。
【０００３】
【従来の技術】
近年、携帯電話や、持ち運び可能なパーソナルコンピュータをはじめとする携帯端末の多機能化や高性能化に伴い、これらの電源としての電池に対し、大容量や大電力が求められている。このような大容量、大電力の要望に対し、リチウムイオン二次電池等の高性能の電池が登場してきた。
【０００４】
これらの電池は、大電力であるため、発熱量も従来の乾電池などと比べて大きい。そしてこれらの電池は温度が高くなりすぎると、電池内部の化学反応に支障をきたすおそれがあり、また、この電池を使用している電気機器または電子機器内の半導体等の電気部品に対し、熱による悪影響を与えるおそれがある。
【０００５】
したがって、これらの高性能の電池は、電池を過熱から保護する手段と共に電池装置として用いられることが多い。またリチウムイオン二次電池等の場合は、より大容量の充電や適切な放電を行わせるために、電池に、充電、放電の制御等を行う保護回路を付けることが多い。
【０００６】
図７は従来の電池装置の斜視図である。図７において、１は有底角筒状のケースで、このケース１は金属により構成され、かつこのケース１内には発電要素（図示せず）を収納している。そしてこの発電要素（図示せず）は一方の極をケース１としている。２は前記ケース１の上方開口部を閉塞する蓋で、この蓋２には前記発電要素（図示せず）の他方の極を構成する電極３を取り付けており、この蓋２と前記ケース１で素電池４を構成している。５は前記蓋２に設置された過熱保護素子で、この過熱保護素子５は素子部６と、この素子部６の両端部に設けられた導電体からなる一対のリード７ａ，７ｂとにより構成されている。そして、この一対のリード７ａ，７ｂのうち、一方のリード７ａは前記電極３にスポット溶接により電気的に接続されている。８は前記ケース１の側面に設置された保護回路基板で、この保護回路基板８には前記素電池４を過充電・過放電等から保護する保護回路（図示せず）を設けている。そしてこの保護回路基板８には金属製の一方の接続部材８ａと、他方の接続部材８ｂを設けており、一方の接続部材８ａは前記他方のリード７ｂとスポット溶接により電気的に接続されている。また他方の接続部材８ｂは前記ケース１に電気的に接続されている。９は前記ケース１の側面から蓋２にかけて設けられた絶縁シートで、この絶縁シート９は、ケース１と、過熱保護素子５における他方のリード７ｂ、保護回路基板８および一対の接続部材８ａ，８ｂとを絶縁し、過熱保護素子５における一対のリード７ａ，７ｂの短絡を防止するものである。
【０００７】
【発明が解決しようとする課題】
しかしながら、上記従来の電池装置においては、過熱保護素子５と保護回路基板８を取り付ける分、装置が大きくなってしまうという課題を有していた。すなわち、過熱保護素子５と保護回路基板８を取り付けるとなると、これらを取り付けるための空間がそれぞれ必要となるもので、このことは、より小型化を図ろうとする携帯端末に用いる電池装置にとっては大きな課題となっていた。
【０００８】
本発明は上記従来の課題を解決するもので、過熱保護素子を有しているにもかかわらず、小型化が図れる電池装置およびその製造方法を提供することを目的とするものである。
【０００９】
【課題を解決するための手段】
上記目的を達成するために、本発明は以下の構成を有するものである。
【００１０】
本発明の請求項１に記載の発明は、正極および負極を有する素電池と、この素電池の過熱時に電流を遮断する素子部およびこの素子部の両側に設けた一対のリードからなり、前記素電池と電気的に接続される過熱保護素子と、この過熱保護素子と電気的に接続されるとともに、少なくとも前記素電池の充電制御または放電制御を行う保護回路基板とを備え、前記保護回路基板に収納部を設け、この収納部に前記過熱保護素子における素子部を入り込ませたもので、この構成によれば、保護回路基板に設けた収納部に過熱保護素子における素子部を入り込ませているため、過熱保護素子の素子部と保護回路基板とは重なり合う部分が生じることになり、その結果、電池装置全体の大きさを小さくすることができるという作用効果が得られるものである。
【００１１】
本発明の請求項２に記載の発明は、特に、過熱保護素子における一対のリードのうち、他方のリードを保護回路基板に電気的に接続するとともに、一方のリードを素電池の正極または負極のいずれかに直接接続したもので、この構成によれば、素電池の熱をより迅速に過熱保護素子が検知できるという作用効果が得られるものである。
【００１２】
本発明の請求項３に記載の発明は、特に、保護回路基板に設けた収納部を開口部または欠落部で構成し、かつこの開口部または欠落部に過熱保護素子における素子部を入り込ませるとともに、過熱保護素子における一対のリードのうち、一方のリードと素電池との接続部を前記開口部または欠落部に露出させたもので、この構成によれば、過熱保護素子における一対のリードのうち、一方のリードと素電池との接続部を保護回路基板に設けた開口部または欠落部に露出させているため、過熱保護素子における一方のリードと素電池との接続部の接続状況を目視により外部から簡単に知ることができるという作用効果が得られるものである。
【００１３】
本発明の請求項４に記載の発明は、特に、過熱保護素子における素子部を収納部に入り込ませて、この過熱保護素子における一対のリードの両方を保護回路基板に直接接続したもので、この構成によれば、過熱保護素子における素子部を保護回路基板に設けた収納部に入り込ませて、過熱保護素子における一対のリードの両方を保護回路基板に直接接続しているため、保護回路基板に設けた収納部と、過熱保護素子における素子部との位置合わせがより正確に行えるという作用効果が得られるものである。
【００１４】
本発明の請求項５に記載の発明は、正極および負極を有する素電池と、この素電池の過熱時に電流を遮断する素子部およびこの素子部の両側に設けた一対のリードからなり、この一対のリードのうち、一方のリードが前記素電池の一方の極と電気的に接続される過熱保護素子と、この過熱保護素子における一対のリードのうち、他方のリードと電気的に接続されるとともに、少なくとも前記素電池の充電制御または放電制御を行う保護回路基板と、前記過熱保護素子における一対のリードのうち、他方のリードと前記保護回路基板とを電気的に接続する第１の接続部材と、前記保護回路基板と前記素電池の他方の極とを電気的に接続する第２の接続部材とを有し、前記過熱保護素子における一方のリードと素電池の一方の極との電気的接続、前記過熱保護素子における他方のリードと第１の接続部材の一端部との電気的接続および前記素電池の他方の極と第２の接続部材の一端部との電気的接続を行った後、前記第１の接続部材の他端部と保護回路基板との電気的接続および第２の接続部材の他端部と保護回路基板との電気的接続を行うようにしたもので、この製造方法によれば、素電池の充電制御または放電制御を行う保護回路基板を素電池に接続する前に、過熱保護素子における一方のリードと素電池の一方の極との電気的接続、前記過熱保護素子における他方のリードと第１の接続部材の一端部との電気的接続および前記素電池の他方の極と第２の接続部材の一端部との電気的接続を行うようにしているため、これらの電気的接続が保護回路基板に与える影響を排除することができるという作用効果が得られるものである。
【００１５】
本発明の請求項６に記載の発明は、特に、過熱保護素子における一方のリードと素電池の一方の極との電気的接続、前記過熱保護素子における他方のリードと第１の接続部材の一端部との電気的接続および前記素電池の他方の極と第２の接続部材の一端部との電気的接続を抵抗溶接で行い、かつ前記第１の接続部材の他端部と保護回路基板との電気的接続および第２の接続部材の他端部と保護回路基板との電気的接続をはんだ付け、レーザー溶接、接着のいずれかで行うようにしたもので、この製造方法によれば、第１の接続部材の他端部と保護回路基板との電気的接続および第２の接続部材の他端部と保護回路基板との電気的接続をはんだ付け、レーザー溶接、接着のいずれかで行うようにしているため、抵抗溶接をした場合の保護回路基板への悪影響を防止できるという作用効果が得られるものである。
【００１６】
本発明の請求項７に記載の発明は、正極および負極を有する素電池と、この素電池の過熱時に電流を遮断する素子部およびこの素子部の両側に設けた一対のリードからなり、前記素電池と電気的に接続される過熱保護素子と、この過熱保護素子と電気的に接続されるとともに、少なくとも前記素電池の充電制御または放電制御を行う保護回路基板とを有し、前記過熱保護素子における他方のリードと保護回路基板とを電気的に接続するとともに、前記保護回路基板と素電池の他方の極とを第２の接続部材を介して電気的に接続し、その後、前記保護回路基板に設けた開口部または欠落部に過熱保護素子における一方のリードと素電池の一方の極とを露出させ、この露出した過熱保護素子における一方のリードと素電池の一方の極とを電気的に接続するようにしたもので、この製造方法によれば、過熱保護素子における他方のリードと保護回路基板とを電気的に接続するとともに、前記保護回路基板と素電池の他方の極とを第２の接続部材を介して電気的に接続し、その後、前記保護回路基板に設けた開口部または欠落部に過熱保護素子における一方のリードと素電池の一方の極とを露出させ、この露出した過熱保護素子における一方のリードと素電池の一方の極とを電気的に接続するようにしているため、保護回路基板と素電池を接続する場合、第１の接続部材は不要となり、これにより、部品数を減少させることができるため、製造が容易になる。また前記第２の接続部材の部分で保護回路基板を折り曲げることにより、過熱保護素子における一方のリードが素電池の一方の極に重複した形で保護回路基板に設けた開口部または欠落部に露出するため、この露出した過熱保護素子における一方のリードと素電池の一方の極との電気的接続も容易に行えるという作用効果が得られるものである。
【００１７】
本発明の請求項８に記載の発明は、特に、過熱保護素子における一方のリードと素電池の一方の極との電気的接続を、この接続を行うために必要なエネルギーを、保護回路基板に設けた開口部または欠落部を通過させて前記過熱保護素子における一方のリードと素電池の一方の極との接続部に供給することにより行うようにしたもので、この製造方法によれば、過熱保護素子における一方のリードと素電池の一方の極との電気的接続を、この接続を行うために必要なエネルギーを、保護回路基板に設けた開口部または欠落部を通過させて行うようにしているため、前記過熱保護素子における一方のリードと素電池の一方の極との接続を行うと同時に、保護回路基板の素電池への位置決め固定が行えるという作用効果が得られるものである。
【００１８】
【発明の実施の形態】
（実施の形態１）
以下、本発明の実施の形態１について、図面を参照しながら説明する。
【００１９】
図１は本発明の実施の形態１における電池装置の一部を破断して示した展開斜視図、図２は同電池装置における保護回路基板を折り曲げた後の斜視図、図３（ａ）は同電池装置の部分縦断面図、図３（ｂ）は同電池装置の上面図である。
【００２０】
図１、図２、図３（ａ）、図３（ｂ）において、１１は発電要素、１２は金属により構成された有底角筒状の電池缶、１３は前記電池缶１２の上方開口部を閉塞する金属製の電池蓋で、この電池蓋１３の略中央部には開口部１３ａが設けられており、この開口部１３ａに前記発電要素１１の一方の極（正極）と電気的に接続されている電極１４を臨ませている。また前記電池缶１２と電池蓋１３はケース１５を構成しているもので、このケース１５内に前記発電要素１１を収納している。１６は前記電池蓋１３の開口部１３ａに設けた電極絶縁部材で、この電極絶縁部材１６は電極１４とケース１５とを絶縁している。１７は発電要素１１の一方の極（正極）と電極１４とを電気的に接続している電極接続部材である。以上説明した１１〜１７の構成部材により素電池１８を構成している。なお、この素電池１８における発電要素１１は、一方の極（正極）を電極１４に接続し、かつ他方の極（負極）を電池缶１２と電気的に接続しているもので、前記電池缶１２は電池蓋１３と電気的に接続されているため、電池缶１２と電池蓋１３からなるケース１５全体は電極１４と異なる電位を有することになる。
【００２１】
１９は過熱保護素子で、この過熱保護素子１９は通常時には電気抵抗が実用上無視できる程度の微小な値であるが、素電池１８の温度を検知して素電池１８が所定の温度になった時に実用上電流を遮断する程度に電気抵抗が極めて高くなる特性を有し、素電池１８の過熱を防止するものである。この過熱保護素子１９としては、所定の温度になると溶解して分断する可溶合金からなる温度ヒューズのように一度電流を遮断すると二度と復帰しないものや、ＰＴＣ特性（Ｐｏｓｉｔｉｖｅ　Ｔｅｍｐｅｒａｔｕｒｅ　Ｃｏｅｆｆｉｃｉｅｎｔ特性）を有する導電性のポリマ樹脂からなるＰＴＣサーミスタのように、所定の温度になると電気抵抗が上昇して電流を遮断するが、温度が低下すると抵抗値も低下して再び電流を流す復帰型の特性を有するものが用いられる。２０は過熱保護素子１９を構成する素子部で、この素子部２０は所定の温度になると電流を遮断するものである。２１ａ，２１ｂは素子部２０の両端から遠方に伸びるように配置された一対のリードで、この一対のリード２１ａ，２１ｂも前記過熱保護素子１９を構成するもので、その材料としては、他の構成部材との電気的接続を抵抗溶接で行うのであれば、Ｎｉを母材とする金属板が好ましい。２２は前記過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続部である。
【００２２】
２３は保護回路基板で、この保護回路基板２３には素電池１８への充電および素電池１８の放電を制御する保護回路（図示せず）を設けている。２４は過熱保護素子１９における他方のリード２１ｂと保護回路基板２３の保護回路（図示せず）とを電気的に接続する第１の接続部材で、金属部材からなるリード板で構成されている。２５は電池蓋１３と保護回路基板２３の保護回路（図示せず）とを電気的に接続する第２の接続部材で、金属部材からなるリード板で構成されている。２６は電池蓋１３と過熱保護素子１９における他方のリード２１ｂとの間に位置して両者１３，２１ｂの短絡を防止するために設けられた短絡防止用の絶縁部材である。なお、図１では、保護回路基板２３を展開した形で示しているが、この保護回路基板２３は、本来は第１の接続部材２４と、第２の接続部材２５の部分で矢印Ａの方向に折り曲げられて電池蓋１３と平行に向かい合うように、すなわち、図２のように配置されているもである。
【００２３】
２７は保護回路基板２３に設けた収納部で、この収納部２７は保護回路基板２３に開口部を設けることにより構成されており、そして前記保護回路基板２３が図２のように折り曲げられて電池蓋１３と平行に向かい合うように配置されると、前記収納部２７に過熱保護素子１９における素子部２０の厚み方向の一部が入り込むとともに、過熱保護素子１９における一方のリード２１ａと電極１４との接続部２２も前記収納部２７に露出した状態となるものである。このように過熱保護素子１９における一方のリード２１ａと電極１４との接続部２２を収納部２７に露出させるようにすると、目視により過熱保護素子１９における一方のリード２１ａと電極１４との接続状態を簡単に知ることができるものである。
【００２４】
図４は本発明の実施の形態１における電池装置の回路図である。この図４において、図１、図２、図３（ａ）、図３（ｂ）で示した構成部材と同一の構成部材については、同一番号を付してその説明は省略し、異なる点のみを説明する。
【００２５】
図４において、２８は素電池１８への充電および素電池１８の放電を制御する保護回路で、保護回路基板２３に設けられている。２９は負荷で、この負荷２９は本発明の実施の形態１における電池装置が電気を供給しようとしている電気機器または電子機器のことである。
【００２６】
次に、図４における各構成部材の関係について説明する。素電池１８は負極を保護回路２８と電気的に接続し、かつ正極を過熱保護素子１９と電気的に接続している。過熱保護素子１９は素電池１８の正極と保護回路２８との間に直列に接続されており、素電池１８が所定の温度になると電流を遮断するものである。保護回路２８は入力側を素電池１８および過熱保護素子１９と電気的に接続し、かつ出力側を負荷２９と電気的に接続している。ここで、負荷２９への電力供給は素電池１８が行っているもので、過熱保護素子１９により電流が遮断されると、負荷２９への電力供給も停止される。また保護回路２８を動作させるための電力も素電池１８が供給しているものである。なお、図４の回路図は素電池１８の放電時の状態を示すもので、過熱保護素子１９の一端は素電池１８の正極と接続され、かつ他端は少なくとも使用時には保護回路２８および負荷２９を介して間接的に素電池１８の負荷と接続されるものである。一方、素電池１８の充電時には負荷２９の代わりに電源が接続される。
【００２７】
次に、本発明の実施の形態１における電池装置の製造方法について説明する。
【００２８】
本発明の実施の形態１における電池装置の素電池１８は、基本的に公知の素電池と同様のものである。また、過熱保護素子１９として用いる温度ヒューズや、ＰＴＣサーミスタも基本的に公知のものと同様のものである。そしてまた、保護回路２８もリチウムイオン二次電池を用いた電池パック等に内蔵されている保護回路と基本的に同じである。したがって、素電池１８、過熱保護素子１９、保護回路２８の製造方法の説明については省略する。
【００２９】
本発明の実施の形態１における電池装置は、素電池１８と、過熱保護素子１９と、保護回路基板２３に設けた保護回路２８とを電気的に接続して、図２、図３（ａ）、（ｂ）に示す形状に組み上げるものであり、その製造方法はいくつか考えられるが、その一例について説明する。
【００３０】
まず、過熱保護素子１９における他方のリード２１ｂとリード板で構成された第１の接続部材２４の一端部とを電気的に接続する。この場合の接続方法は、抵抗溶接、レーザー溶接、はんだ付けのいずれでもよく、この両者２１ｂ，２４を電気的に接続することができるものであればよい。
【００３１】
次に、過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４とを電気的に接続する。この場合の接続方法も、両者２１ａ，１４を電気的に接続することができるものであればよく、種々の方法が考えられる。例えば、抵抗溶接やレーザー溶接で両者２１ａ，１４を電気的に接続すればよい。一方、はんだ付けは電極１４の温度を一定以上の温度にしないと確実なはんだ付けができないものであり、したがって、はんだ付けの場合は、素電池１８を過熱させることにもつながるため、好ましくない。但し、低温で確実に接続することができるはんだ付けが可能となれば、これを用いてもよい。
【００３２】
これと前後して、リード板で構成された第２の接続部材２５の一端部と素電池１８における電池蓋１３とを電気的に接続する。この場合の接続方法は、前記過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続方法と同様の方法で行えばよい。
【００３３】
次に、第１の接続部材２４の他端部と保護回路基板２３とを電気的に接続するとともに、第２の接続部材２５の他端部と保護回路基板２３とを電気的に接続する。この場合の接続方法は、はんだ付けや、レーザー溶接、接着が用いられる。抵抗溶接は、保護回路２８へ悪影響を及ぼす可能性がある場合には、用いない方がよいが、そのような可能性がなければ、この抵抗溶接を用いてもよい。これと前後して、短絡防止のため、絶縁部材２６を電池蓋１３と過熱保護素子１９における他方のリード２１ｂとの間に位置させておく。
【００３４】
以上説明した製造方法によって、図１に示す電池装置は作られ、そして図１の矢印Ａ方向に保護回路基板２３を折り曲げて保護回路基板２３と電池蓋１３とが平行に向かい合うようにすると、図２、図３（ａ）、図３（ｂ）に示すように、保護回路基板２３に設けた開口部からなる収納部２７に過熱保護素子１９における素子部２０の一部が入り込んだ構成となるものである。
【００３５】
上記した本発明の実施の形態１においては、過熱保護素子１９における一対のリード２１ａ，２１ｂのうち、他方のリード２１ｂを保護回路基板２３に第１の接続部材２４を介して電気的に接続するとともに、一方のリード２１ａを、素電池１８における発電要素１１の一方の極（正極）と電気的に接続されている電極１４に直接接続しているため、素電池１８の熱をより迅速に過熱保護素子１９が検知できるという効果を有するものである。
【００３６】
また、上記本発明の実施の形態１においては、素電池１８の充電制御または放電制御を行う保護回路基板２３を素電池１８に接続する前に、過熱保護素子１９における一方のリード２１ａと素電池１８の一方の極を構成する電極１４との電気的接続、前記過熱保護素子１９における他方のリード２１ｂと第１の接続部材２４の一端部との電気的接続および前記素電池１８の他方の極を構成する電池蓋１３と第２の接続部材２５の一端部との電気的接続を行うようにしているため、これらの電気的接続が保護回路基板２３に与える影響を排除することができるという効果を有するものである。
【００３７】
そしてまた、上記本発明の実施の形態１においては、第１の接続部材２４の他端部と保護回路基板２３との電気的接続および第２の接続部材２５の他端部と保護回路基板２３との電気的接続をはんだ付け、レーザー溶接、接着のいずれかで行うようにしているため、抵抗溶接をした場合の保護回路基板２３への悪影響を防止できるという効果を有するものである。
【００３８】
なお、本発明の電池装置の製造方法は、上述した内容にとらわれる必要はなく、特に、素電池１８、過熱保護素子１９、第１の接続部材２４、第２の接続部材２５、保護回路基板２３の接続順序は、上述した順序以外でもよいものである。
【００３９】
また、抵抗溶接は比較的作業も容易であり、かつ作業時間も短く、さらには抵抗溶接を行うための装置も比較的安価で大がかりなものではないため、電池装置では多くの接続部において用いられているが、素電池１８における電極１４と過熱保護素子１９における一方のリード２１ａとの接続や、素電池１８における電池蓋１３と第２の接続部材２５との接続を抵抗溶接で行う場合、抵抗溶接による保護回路２８への悪影響が懸念される場合には、上述した順序で行うのが望ましい。
【００４０】
一方、抵抗溶接による保護回路２８への悪影響が懸念されない場合には、以下の順序による方法もある。
【００４１】
まず、保護回路基板２３に第２の接続部材２５の他端部をあらかじめ接続するとともに、過熱保護素子１９における他方のリード２１ｂを一端部に接続してなる第１の接続部材２４の他端部もあらかじめ保護回路基板２３に接続しておく。
【００４２】
次に、第２の接続部材２５の一端部と電池蓋１３とを電気的に接続する。そして図１の矢印Ａ方向に保護回路基板２３を折り曲げて保護回路基板２３と電池蓋１３とが平行に向かい合うようにすると、図２、図３（ａ）、図３（ｂ）に示すように、保護回路基板２３に設けた開口部からなる収納部２７に過熱保護素子１９における素子部２０の一部が入り込んだ構成となる。このとき、過熱保護素子１９における一方のリード２１ａは素電池１８における電極１４の上に重複し、そしてこの重複部分は保護回路基板２３に設けた収納部２７に露出した状態となっているため、この重複部分を抵抗溶接、レーザー溶接、はんだ付け等の方法で電気的に接続する。この重複部分である過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４とを接続するためには、何らかのエネルギーが必要であるが、このエネルギーは保護回路基板２３に設けた開口部からなる収納部２７を通って過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続部２２に供給されるものである。
【００４３】
上記過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との重複部分を電気的に接続する場合、抵抗溶接、レーザー溶接、はんだ付け等の方法が用いられるが、抵抗溶接による保護回路基板２３への影響を無くするためには、保護回路基板２３上のＩＣ等を保護するための手段、例えば復帰型ヒューズ等を設けたり、あるいはＩＣそのものに耐電流、耐電圧に優れたものを用いる等の手段が考えられる。
【００４４】
上記した製造工程を行うことにより、図２に示すような電池装置を製造することができる。この製造方法においては、保護回路基板２３の第２の接続部材２５の他端部をあらかじめ接続するとともに、過熱保護素子１９における他方のリード２１ｂを一端部に接続してなる第１の接続部材２４の他端部もあらかじめ保護回路基板２３に接続しているため、一端部が未拘束のリードや接続部材を素電池１８に接続するものに比べ、製造工程中の短絡の可能性が低くなるという効果を有するものである。
【００４５】
以上、実施の形態１を用いて、本発明の電池装置を説明したが、本発明は実施の形態１の内容に限定されるものではなく、様々なバリエーションが可能である。
【００４６】
例えば、本発明の実施の形態１においては、素電池１８における発電要素１１の一方の極（正極）を電池蓋１３の開口部１３ａに臨ませた電極１４に接続し、かつ他方の極（負極）を電池蓋１３と電気的に接続された電池缶１２に電気的に接続するようにしていたが、これは逆に接続するようにしてもよいものである。また、発電要素１１の他方の極（負極）は電池缶１２と電池蓋１３からなるケース１５全体に電気的に接続されているため、ケース１５全体が負極となっているが、有底角筒状の電池缶１２の底面部のみに発電要素１１の他方の極（負極）を接続することにより、電池缶１２の底面部のみを負極とし、それ以外の部分には絶縁を施すようにしてもよいものである。この場合は、電池蓋１３と過熱保護素子１９における他方のリード２１ｂとの絶縁をする必要がなくなるものである。そしてまた、素電池１８におけるケース１５を構成する電池缶１２は有底角筒状に構成していたが、有底円筒状に構成してもよいものである。さらに、保護回路基板２３の保護回路２８に接続される第２の接続部材２５は電池蓋１３に接続するようにしていたが、電池缶１２の底面部に接続するようにしてもよいものである。さらにまた、過熱保護素子１９は電池蓋１３の開口部１３ａに臨ませた電極１４と、保護回路基板２３との間に電気的に接続するようにしていたが、ケース１５と保護回路基板２３との間に過熱保護素子１９を電気的に接続するようにしてもよく、この場合は、第２の接続部材２５が電池蓋１３の開口部１３ａに臨ませた電極１４と保護回路基板２３とを接続することになる。
【００４７】
また、上記本発明の実施の形態１においては、保護回路基板２３に設けられる収納部２７を、四方が囲まれた開口部により構成しているが、この開口部に限定されるものではなく、これ以外の、例えば三方が囲まれ、かつ一方が開放されている切り欠き部からなる欠落部により収納部２７を構成してもよく、さらには保護回路基板２３の電池蓋１３と対向する面側に凹部よりなる収納部２７を設けてもよいものである。これらの場合においても、図１の矢印Ａ方向に保護回路基板２３を折り曲げて保護回路基板２３と電池蓋１３とが平行に向かい合うようにすると、保護回路基板２３に設けた欠落部あるいは凹部からなる収納部２７に過熱保護素子１９における素子部２０の一部が入り込んだ構成となるものである。
【００４８】
上記のように本発明の実施の形態１においては、保護回路基板２３に設けた開口部、欠落部、凹部のいずれかからなる収納部２７に過熱保護素子１９における素子部２０を入り込ませているため、過熱保護素子１９の素子部２０と保護回路基板２３とは重なり合う部分が生じることになり、その結果、電池装置全体の大きさを小さくすることができるという効果を有するものである。
【００４９】
また、上記本発明の実施の形態１において、保護回路基板２３に設けた収納部２７を開口部または欠落部で構成した場合は、過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続部２２を、前記開口部または欠落部から露出させることができるため、過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続部２２の接続状況を目視により外部から簡単に知ることができるという効果を有するものである。
【００５０】
（実施の形態２）
以下、本発明の実施の形態２について、図面を参照しながら説明する。
【００５１】
図５は本発明の実施の形態２における電池装置の展開斜視図である。この図５において、図１、図２、図３（ａ）、図３（ｂ）で示した本発明の実施の形態１の構成部材と同一の構成部材については、同一番号を付してその説明は省略し、異なる点のみを説明する。
【００５２】
すなわち、本発明の実施の形態２における電池装置は、過熱保護素子１９における素子部２０を保護回路基板２３に設けた開口部よりなる収納部２７に入り込ませて、この過熱保護素子１９における一対のリード２１ａ，２１ｂの両方を保護回路基板２３の電池蓋１３と対向する面に直接接続したものである。また、この本発明の実施の形態２における電池装置は、上記以外に、第１の接続部材２４の一端部を素電池１８における電極１４に、かつ他端部を保護回路基板２３にそれぞれ電気的に接続するとともに、第２の接続部材２５の一端部を素電池１８における電池蓋１３に、かつ他端部を保護回路基板２３にそれぞれ電気的に接続することにより、保護回路基板２３と素電池１８を接続しているのである。このような構成において、保護回路基板２３を矢印Ａ方向に折り曲げると、保護回路基板２３と電池蓋１３とが平行に向かい合うものである。
【００５３】
上記本発明の実施の形態２における電池装置においては、過熱保護素子１９における素子部２０を保護回路基板２３に設けた開口部よりなる収納部２７に入り込ませて、この過熱保護素子１９における一対のリード２１ａ，２１ｂの両方を保護回路基板２３に直接接続しているため、保護回路基板２３に設けた収納部２７と、過熱保護素子１９における素子部２０との位置合わせがより正確に行えるものである。また、この位置合わせが容易なことから、保護回路基板２３に設けた開口部よりなる収納部２７の大きさも必要最小限にすることができるため、その分、保護回路基板２３上への各種電気部品の実装面積も確保することが可能となり、これにより、電池装置の小型化が図れるという効果を有するものである。
【００５４】
また、上記本発明の実施の形態２における電池装置の製造方法は、先に保護回路基板２３上に過熱保護素子１９を接続しておき、その後、第１の接続部材２４および第２の接続部材２５により、素電池１８と保護回路基板２３とを電気的に接続すればよいもので、その接続方法は、上記本発明の実施の形態１における電池装置の製造方法と同様の方法で行えばよいものである。
【００５５】
なお、上記本発明の実施の形態２においては、保護回路基板２３に設けられる収納部２７を、四方が囲まれた開口部により構成しているが、この開口部に限定されるものではなく、これ以外の、例えば三方が囲まれ、かつ一方が開放されている切り欠き部からなる欠落部により収納部２７を構成した場合でも、上記本発明の実施の形態２と同様の効果が得られるものである。
【００５６】
（実施の形態３）
以下、本発明の実施の形態３について、図面を参照しながら説明する。
【００５７】
図６は本発明の実施の形態３における電池装置の展開斜視図である。この図６において、図１、図２、図３（ａ）、図３（ｂ）で示した本発明の実施の形態１の構成部材と同一の構成部材については、同一番号を付してその説明は省略し、異なる点のみを説明する。
【００５８】
すなわち、本発明の実施の形態３における電池装置は、過熱保護素子１９における一対のリード２１ａ，２１ｂのうち、他方のリード２１ｂを保護回路基板２３に直接接続し、かつこの過熱保護素子１９の素子部２０は保護回路基板２３に設けた開口部よりなる収納部２７に入り込むようにし、さらに過熱保護素子１９における一対のリード２１ａ，２１ｂのうち、一方のリード２１ａは保護回路基板２３に設けた開口部よりなる収納部２７に露出するようにしたものである。また、保護回路基板２３と素電池１８は、第２の接続部材２５の一端部を素電池１８における電池蓋１３に、かつ他端部を保護回路基板２３にそれぞれ電気的に接続することにより接続している。このような構成において、図６の矢印Ａ方向に保護回路基板２３を折り曲げて保護回路基板２３と電池蓋１３とが平行に向かい合うようにすると、過熱保護素子１９における一方のリード２１ａは素電池１８における電極１４の上に重複し、そしてこの重複部分は保護回路基板２３に設けた開口部よりなる収納部２７に露出した状態となっているため、この重複部分を抵抗溶接、レーザー溶接、はんだ付け等のエネルギーを用いた方法で電気的に接続する。この場合、重複部分である過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との電気的接続は、この接続を行うために必要なエネルギーを、保護回路基板２３に設けた収納部２７を構成する開口部を通過させて前記過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続部に供給することにより行っているものである。
【００５９】
また、上記本発明の実施の形態３における電池装置の製造方法は、先に保護回路基板２３上に過熱保護素子１９を接続しておき、その後、第２の接続部材２５により、素電池１８と保護回路基板２３とを電気的に接続すればよく、その接続方法は、上記本発明の実施の形態１における電池装置の製造方法と同様の方法で行えばよいものである。
【００６０】
上記本発明の実施の形態３においては、保護回路基板２３に設けた収納部２７を開口部で構成し、かつこの開口部に過熱保護素子１９における素子部２０を入り込ませるとともに、過熱保護素子１９における一対の２１ａ，２１ｂのうち、一方のリード２１ａと素電池１８における電極１４との接続部を前記開口部に露出させているため、過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続部の接続状況を目視により外部から簡単に知ることができる。また、過熱保護素子１９における一方のリード２１ａを素電池１８における電極１４の上に重複させ、そしてこの重複部分を保護回路基板２３に設けた開口部よりなる収納部２７に露出させるとともに、この重複部分を抵抗溶接、レーザー溶接、はんだ付け等の方法で電気的に接続しているため、第１の接続部材２４が不要となり、これにより、部品数を減少させることができるため、製造が容易になるという効果を有するものである。
【００６１】
また、上記本発明の実施の形態３においては、過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との電気的接続を、この接続を行うために必要なエネルギーを、保護回路基板２３に設けた収納部２７を構成する開口部を通過させて前記過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続部に供給することにより行うようにしているため、前記過熱保護素子１９における一方のリード２１ａと素電池１８における電極１４との接続を行うと同時に、保護回路基板２３の素電池１８への位置決め固定が行えるという効果を有するものである。
【００６２】
なお、上記本発明の実施の形態３においては、保護回路基板２３に設けられる収納部２７を、四方が囲まれた開口部により構成しているが、この開口部に限定されるものではなく、これ以外の、例えば三方が囲まれ、かつ一方が開放されている切り欠き部からなる欠落部により収納部２７を構成した場合でも、上記本発明の実施の形態３と同様の効果が得られるものである。
【００６３】
【発明の効果】
以上のように本発明の電池装置は、正極および負極を有する素電池と、この素電池の過熱時に電流を遮断する素子部およびこの素子部の両側に設けた一対のリードからなり、前記素電池と電気的に接続される過熱保護素子と、この過熱保護素子と電気的に接続されるとともに、少なくとも前記素電池の充電制御または放電制御を行う保護回路基板とを備え、前記保護回路基板に収納部を設け、この収納部に前記過熱保護素子における素子部を入り込ませるようにしているため、過熱保護素子の素子部と保護回路基板とは重なり合う部分が生じることになり、その結果、電池装置全体の大きさを小さくすることができるという優れた効果を奏するものである。
【図面の簡単な説明】
【図１】本発明の実施の形態１における電池装置の一部を破断して示した展開斜視図
【図２】同電池装置における保護回路基板を折り曲げた後の斜視図
【図３】（ａ）同電池装置の部分縦断面図
（ｂ）同電池装置の上面図
【図４】同電池装置の回路図
【図５】本発明の実施の形態２における電池装置の一部を破断して示した展開斜視図
【図６】本発明の実施の形態３における電池装置の一部を破断して示した展開斜視図
【図７】従来の電池装置の斜視図
【符号の説明】
１１　発電要素
１２　電池缶
１３　電池蓋
１４　電極
１５　ケース
１８　素電池
１９　過熱保護素子
２０　素子部
２１ａ，２１ｂ　一対のリード
２２　接続部
２３　保護回路基板
２４　第１の接続部材
２５　第２の接続部材
２７　収納部[0001]
TECHNICAL FIELD OF THE INVENTION
In general, batteries are used in various devices, and in recent years, batteries have been increasingly used as power sources for portable terminals such as portable telephones and portable personal computers called notebook computers.
[0002]
The present invention relates to a battery device used for an electric device or an electronic device including such a portable terminal and a method for manufacturing the same.
[0003]
[Prior art]
In recent years, as mobile terminals such as mobile phones and portable personal computers have become multifunctional and have higher performance, large capacity and high power are required for batteries as power sources. In response to such demands for large capacity and large power, high performance batteries such as lithium ion secondary batteries have appeared.
[0004]
Since these batteries have a large electric power, they generate a large amount of heat as compared with conventional dry batteries. If the temperature of these batteries becomes too high, the chemical reaction inside the batteries may be hindered.In addition, electric components using the batteries or electric components such as semiconductors in electronic devices may be damaged by heat. May have an adverse effect.
[0005]
Therefore, these high-performance batteries are often used as battery devices together with means for protecting the batteries from overheating. In the case of a lithium ion secondary battery or the like, a battery is often provided with a protection circuit for controlling charging and discharging, etc., in order to perform charging and discharging appropriately with a larger capacity.
[0006]
FIG. 7 is a perspective view of a conventional battery device. In FIG. 7, reference numeral 1 denotes a case having a bottomed rectangular cylindrical shape. The case 1 is made of metal and houses a power generating element (not shown) in the case 1. This power generating element (not shown) has one pole as a case 1. Reference numeral 2 denotes a lid for closing the upper opening of the case 1. An electrode 3 constituting the other pole of the power generating element (not shown) is attached to the lid 2. The unit cell 4 is constituted. Reference numeral 5 denotes an overheat protection element provided on the lid 2. The overheat protection element 5 includes an element portion 6 and a pair of leads 7a and 7b made of a conductor provided at both ends of the element portion 6. ing. One of the leads 7a and 7b is electrically connected to the electrode 3 by spot welding. Reference numeral 8 denotes a protection circuit board provided on the side surface of the case 1. The protection circuit board 8 is provided with a protection circuit (not shown) for protecting the unit cells 4 from overcharge, overdischarge, and the like. The protection circuit board 8 is provided with one connection member 8a made of metal and the other connection member 8b, and the one connection member 8a is electrically connected to the other lead 7b by spot welding. . The other connecting member 8b is electrically connected to the case 1. Reference numeral 9 denotes an insulating sheet provided from the side surface of the case 1 to the lid 2. The insulating sheet 9 includes the case 1, the other lead 7 b of the overheat protection element 5, the protection circuit board 8, and a pair of connection members 8 a and 8 b. To prevent a short circuit between the pair of leads 7a and 7b in the overheat protection element 5.
[0007]
[Problems to be solved by the invention]
However, in the above-mentioned conventional battery device, there is a problem that the size of the device is increased by the amount of attachment of the overheat protection element 5 and the protection circuit board 8. That is, when the overheat protection element 5 and the protection circuit board 8 are mounted, a space for mounting them is required, which is great for a battery device used for a portable terminal that is going to be made more compact. Had been an issue.
[0008]
An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a battery device which can be downsized despite having an overheat protection element, and a method of manufacturing the same.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
[0010]
The invention according to claim 1 of the present invention comprises a unit cell having a positive electrode and a negative electrode, an element unit for interrupting current when the unit cell is overheated, and a pair of leads provided on both sides of the element unit. An overheat protection element electrically connected to the battery, and a protection circuit board electrically connected to the overheat protection element and performing at least charge control or discharge control of the unit cell; The storage section is provided, and the element section of the overheat protection element is inserted into the storage section. According to this configuration, the element section of the overheat protection element is inserted into the storage section provided on the protection circuit board. , The element portion of the overheat protection element and the protection circuit board are overlapped with each other, and as a result, the effect that the size of the whole battery device can be reduced can be obtained. A.
[0011]
The invention according to claim 2 of the present invention is particularly adapted to electrically connect the other lead of the pair of leads in the overheat protection element to the protection circuit board and connect one of the leads to the positive or negative electrode of the unit cell. According to this configuration, the overheat protection element can more quickly detect the heat of the unit cell, and the operation and effect can be obtained.
[0012]
In the invention according to claim 3 of the present invention, particularly, the storage portion provided on the protection circuit board is constituted by an opening or a missing portion, and the element portion of the overheat protection element is inserted into the opening or the missing portion. According to this configuration, the connection portion between one of the leads and the unit cell is exposed to the opening or the missing portion. Since the connection between one lead and the unit cell is exposed to the opening or the cutout provided in the protection circuit board, the connection state of the connection between the one lead and the unit cell in the overheat protection element is visually observed. The effect of being able to easily know from the outside is obtained.
[0013]
The invention according to claim 4 of the present invention is particularly configured such that the element portion of the overheat protection element is inserted into the housing portion, and both the pair of leads of the overheat protection element are directly connected to the protection circuit board. According to the configuration, the element portion of the overheat protection element is inserted into the storage section provided on the protection circuit board, and both the pair of leads of the overheat protection element are directly connected to the protection circuit board. The operation and effect that the provided storage portion and the element portion of the overheat protection element can be more accurately aligned can be obtained.
[0014]
The invention according to claim 5 of the present invention comprises a unit cell having a positive electrode and a negative electrode, an element unit for interrupting current when the unit cell is overheated, and a pair of leads provided on both sides of the element unit. One of the leads is electrically connected to one pole of the unit cell, and the other of the pair of leads in the overheat protection element is electrically connected to the other lead. A protection circuit board that performs at least charge control or discharge control of the unit cell, and a first connection member that electrically connects the other of the pair of leads of the overheat protection element to the protection circuit board. A second connection member for electrically connecting the protection circuit board and the other pole of the unit cell, and electrically connecting one lead of the overheat protection element to one pole of the unit cell. , After the electrical connection between the other lead of the overheat protection element and one end of the first connection member and the electrical connection between the other pole of the unit cell and one end of the second connection member, The electrical connection between the other end of the first connection member and the protection circuit board and the electrical connection between the other end of the second connection member and the protection circuit board are performed. For example, before connecting a protection circuit board for performing charge control or discharge control of a unit cell to the unit cell, an electrical connection between one lead of the overheat protection element and one pole of the unit cell, and the other of the overheat protection element. Are electrically connected to one end of the first connection member and one end of the second connection member to the other pole of the unit cell. Eliminate the effect of connections on the protection circuit board In which advantages are achieved that it.
[0015]
The invention according to claim 6 of the present invention is particularly directed to an electrical connection between one lead of the overheat protection element and one pole of the unit cell, and one end of the other lead and the first connection member in the overheat protection element. And electrical connection between the other part of the unit cell and one end of the second connection member by resistance welding, and the other end of the first connection member and the protection circuit board. And electrical connection between the other end of the second connection member and the protection circuit board is performed by soldering, laser welding, or bonding. According to this manufacturing method, The electrical connection between the other end of the first connection member and the protection circuit board and the electrical connection between the other end of the second connection member and the protection circuit board are performed by soldering, laser welding, or bonding. The protection circuit base in the case of resistance welding. Effect that the adverse effect on the prevented are those obtained.
[0016]
The invention according to claim 7 of the present invention comprises a unit cell having a positive electrode and a negative electrode, an element unit for interrupting current when the unit cell is overheated, and a pair of leads provided on both sides of the element unit. An overheat protection element electrically connected to the battery, and a protection circuit board electrically connected to the overheat protection element and performing at least charge control or discharge control of the unit cell; Electrically connecting the other lead and the protection circuit board, and electrically connecting the protection circuit board and the other pole of the unit cell via a second connection member. The one lead of the overheat protection element and one pole of the unit cell are exposed to the opening or the missing part provided in the above, and the one lead of the exposed overheat protection element and one pole of the unit cell are electrically connected to each other. According to this manufacturing method, the other lead of the overheat protection element and the protection circuit board are electrically connected, and the protection circuit board and the other pole of the unit cell are connected to the second electrode. After that, one lead of the overheat protection element and one pole of the unit cell are exposed to an opening or a missing portion provided in the protection circuit board, and the exposed overheating is performed. Since one lead of the protection element is electrically connected to one pole of the unit cell, the first connection member is unnecessary when the protection circuit board is connected to the unit cell. Since the number can be reduced, manufacturing becomes easier. Further, by bending the protection circuit board at the portion of the second connection member, one lead of the overheat protection element is exposed to an opening or a cutout provided in the protection circuit board in a form overlapping with one pole of the unit cell. Therefore, an operational effect can be obtained in that electrical connection between one lead of the exposed overheat protection element and one pole of the unit cell can be easily performed.
[0017]
The invention according to claim 8 of the present invention particularly provides an electrical connection between one lead of the overheat protection element and one pole of the unit cell, and energy necessary for making this connection to the protection circuit board. According to this manufacturing method, the overheating protection element is supplied to a connection portion between one lead of the overheating protection element and one pole of the unit cell through an opening or a missing portion provided. The electrical connection between one lead of the protection element and one pole of the unit cell is performed by passing the energy required for this connection through an opening or a cutout provided in the protection circuit board. Therefore, an operation and effect can be obtained in which one of the leads in the overheat protection element is connected to one of the poles of the unit cell and, at the same time, the protection circuit board can be positioned and fixed to the unit cell.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is an exploded perspective view showing a part of the battery device according to the first embodiment of the present invention in a cut-away manner, FIG. 2 is a perspective view showing the battery device after the protection circuit board is bent, and FIG. FIG. 3B is a partial longitudinal sectional view of the battery device, and FIG. 3B is a top view of the battery device.
[0020]
1, 2, 3 (a), and 3 (b), 11 is a power generation element, 12 is a battery can having a bottomed rectangular cylindrical shape made of metal, and 13 is an upper opening of the battery can 12. The battery cover 13 is provided with an opening 13a at a substantially central portion of the battery cover 13, and the opening 13a is electrically connected to one pole (positive electrode) of the power generating element 11. Facing the electrode 14. The battery can 12 and the battery lid 13 constitute a case 15 in which the power generation element 11 is housed. Reference numeral 16 denotes an electrode insulating member provided in the opening 13a of the battery cover 13, and the electrode insulating member 16 insulates the electrode 14 from the case 15. Reference numeral 17 denotes an electrode connecting member for electrically connecting one electrode (positive electrode) of the power generation element 11 and the electrode 14. The unit cell 18 is constituted by the constituent members 11 to 17 described above. The power generating element 11 of the unit cell 18 has one electrode (positive electrode) connected to the electrode 14 and the other electrode (negative electrode) electrically connected to the battery can 12. Since 12 is electrically connected to the battery cover 13, the entire case 15 including the battery can 12 and the battery cover 13 has a potential different from that of the electrode 14.
[0021]
Reference numeral 19 denotes an overheat protection element. The overheat protection element 19 normally has a very small electric resistance that can be practically ignored. However, the temperature of the unit cell 18 is detected and the unit cell 18 reaches a predetermined temperature. In some cases, the electric resistance is extremely high enough to cut off the current in practical use, and the overheat of the unit cell 18 is prevented. Examples of the overheat protection element 19 include a temperature fuse made of a fusible alloy that melts and breaks at a predetermined temperature, and does not return once the current is cut off, or a conductive material having a PTC (Positive Temperature Coefficient) characteristic. As in the case of PTC thermistors made of conductive polymer resin, when the temperature reaches a predetermined temperature, the electrical resistance rises and interrupts the current, but when the temperature falls, the resistance decreases and the current flows again, and has a return-type characteristic. Is used. Reference numeral 20 denotes an element portion that constitutes the overheat protection element 19, and this element portion 20 cuts off current when a predetermined temperature is reached. 21a and 21b are a pair of leads arranged so as to extend far from both ends of the element portion 20. The pair of leads 21a and 21b also constitutes the overheat protection element 19, and is made of another material. If the electrical connection with the member is made by resistance welding, a metal plate containing Ni as a base material is preferable. Reference numeral 22 denotes a connection portion between one lead 21 a of the overheat protection element 19 and the electrode 14 of the unit cell 18.
[0022]
Reference numeral 23 denotes a protection circuit board. The protection circuit board 23 is provided with a protection circuit (not shown) for controlling charging and discharging of the unit cells 18. Reference numeral 24 denotes a first connection member for electrically connecting the other lead 21b of the overheat protection element 19 and a protection circuit (not shown) of the protection circuit board 23, and is constituted by a lead plate made of a metal member. Reference numeral 25 denotes a second connection member for electrically connecting the battery lid 13 and a protection circuit (not shown) of the protection circuit board 23, and is constituted by a lead plate made of a metal member. Reference numeral 26 denotes a short-circuit preventing insulating member which is provided between the battery cover 13 and the other lead 21b of the overheat protection element 19 to prevent a short circuit between the two and 13b. In FIG. 1, the protection circuit board 23 is shown in an unfolded form. However, the protection circuit board 23 originally has a first connection member 24 and a second connection member 25 in the direction of arrow A. And is arranged so as to face parallel to the battery cover 13, that is, as shown in FIG.
[0023]
Reference numeral 27 denotes a storage section provided on the protection circuit board 23. The storage section 27 is formed by providing an opening in the protection circuit board 23, and the protection circuit board 23 is bent as shown in FIG. When disposed so as to face in parallel with the lid 13, a part of the element portion 20 of the overheat protection element 19 in the thickness direction enters the housing portion 27, and the one lead 21 a of the overheat protection element 19 and the electrode 14 The connection portion 22 is also exposed to the storage portion 27. When the connection portion 22 between the one lead 21a and the electrode 14 in the overheat protection element 19 is exposed to the storage section 27, the connection state between the one lead 21a and the electrode 14 in the overheat protection element 19 is visually observed. You can easily find out.
[0024]
FIG. 4 is a circuit diagram of the battery device according to Embodiment 1 of the present invention. 4, the same components as those shown in FIGS. 1, 2, 3 (a) and 3 (b) are denoted by the same reference numerals and the description thereof will be omitted, and only different points will be described. Will be described.
[0025]
In FIG. 4, a protection circuit 28 controls charging of the unit cell 18 and discharging of the unit cell 18, and is provided on the protection circuit board 23. Reference numeral 29 denotes a load, and the load 29 is an electric device or an electronic device to which the battery device according to Embodiment 1 of the present invention is to supply electricity.
[0026]
Next, the relationship between the components in FIG. 4 will be described. The cell 18 has a negative electrode electrically connected to the protection circuit 28 and a positive electrode electrically connected to the overheat protection element 19. The overheat protection element 19 is connected in series between the positive electrode of the unit cell 18 and the protection circuit 28, and cuts off current when the unit cell 18 reaches a predetermined temperature. The protection circuit 28 has an input side electrically connected to the unit cell 18 and the overheat protection element 19, and an output side electrically connected to the load 29. Here, the power supply to the load 29 is performed by the unit cell 18. When the current is cut off by the overheat protection element 19, the power supply to the load 29 is also stopped. The electric power for operating the protection circuit 28 is also supplied by the unit cell 18. Note that the circuit diagram of FIG. 4 shows a state of the unit cell 18 at the time of discharging. One end of the overheat protection element 19 is connected to the positive electrode of the unit cell 18, and the other end is at least the protection circuit 28 and the load 29 at the time of use. And is indirectly connected to the load of the unit cell 18 via the. On the other hand, a power supply is connected instead of the load 29 when the unit cell 18 is charged.
[0027]
Next, a method of manufacturing the battery device according to Embodiment 1 of the present invention will be described.
[0028]
The cell 18 of the battery device according to Embodiment 1 of the present invention is basically the same as a known cell. The temperature fuse used as the overheat protection element 19 and the PTC thermistor are basically the same as those known in the art. The protection circuit 28 is basically the same as a protection circuit built in a battery pack or the like using a lithium ion secondary battery. Therefore, description of the method of manufacturing the unit cell 18, the overheat protection element 19, and the protection circuit 28 will be omitted.
[0029]
In the battery device according to Embodiment 1 of the present invention, the unit cell 18, the overheat protection element 19, and the protection circuit 28 provided on the protection circuit board 23 are electrically connected to each other, as shown in FIGS. , (B), and there are several possible manufacturing methods. An example will be described.
[0030]
First, the other lead 21b of the overheat protection element 19 is electrically connected to one end of the first connection member 24 formed of a lead plate. In this case, the connection method may be any of resistance welding, laser welding, and soldering, as long as the two 21b and 24 can be electrically connected.
[0031]
Next, one lead 21a of the overheat protection element 19 and the electrode 14 of the unit cell 18 are electrically connected. The connection method in this case may be any method as long as the two 21a and 14 can be electrically connected, and various methods are conceivable. For example, the two members 21a and 21 may be electrically connected by resistance welding or laser welding. On the other hand, soldering cannot be reliably performed unless the temperature of the electrode 14 is equal to or higher than a certain value. Therefore, soldering is not preferable because the unit cell 18 is overheated. However, if soldering that can be reliably connected at a low temperature becomes possible, this may be used.
[0032]
Before or after this, one end of the second connection member 25 formed of a lead plate and the battery cover 13 of the unit cell 18 are electrically connected. In this case, the connection method may be the same as the connection method between the one lead 21a of the overheat protection element 19 and the electrode 14 of the unit cell 18.
[0033]
Next, the other end of the first connection member 24 is electrically connected to the protection circuit board 23, and the other end of the second connection member 25 is electrically connected to the protection circuit board 23. In this case, as a connection method, soldering, laser welding, or bonding is used. If there is a possibility that the resistance welding may adversely affect the protection circuit 28, it is better not to use it. However, if there is no such possibility, this resistance welding may be used. Before or after this, the insulating member 26 is positioned between the battery lid 13 and the other lead 21b of the overheat protection element 19 to prevent a short circuit.
[0034]
By the manufacturing method described above, the battery device shown in FIG. 1 is manufactured, and the protection circuit board 23 is bent in the direction of arrow A in FIG. 1 so that the protection circuit board 23 and the battery cover 13 face in parallel. 2. As shown in FIGS. 3 (a) and 3 (b), a part of the element section 20 of the overheat protection element 19 enters a storage section 27 having an opening provided in the protection circuit board 23. Things.
[0035]
In the above-described first embodiment of the present invention, of the pair of leads 21 a and 21 b in the overheat protection element 19, the other lead 21 b is electrically connected to the protection circuit board 23 via the first connection member 24. At the same time, since one lead 21a is directly connected to the electrode 14 electrically connected to one pole (positive electrode) of the power generating element 11 in the unit cell 18, the heat of the unit cell 18 is more quickly heated. This has the effect that the protection element 19 can be detected.
[0036]
In the first embodiment of the present invention, one lead 21a of the overheat protection element 19 is connected to the unit cell 18 before the protection circuit board 23 for controlling the charge or discharge of the unit cell 18 is connected to the unit cell 18. And electrical connection between the other lead 21b of the overheat protection element 19 and one end of the first connection member 24 and the other electrode of the unit cell 18. Is electrically connected between the battery lid 13 and one end of the second connection member 25, so that the effect of these electrical connections on the protection circuit board 23 can be eliminated. It has.
[0037]
In the first embodiment of the present invention, the electrical connection between the other end of the first connection member 24 and the protection circuit board 23 and the other end of the second connection member 25 and the protection circuit board 23 Since the electrical connection to the protection circuit board 23 is performed by any of soldering, laser welding, and bonding, it is possible to prevent an adverse effect on the protection circuit board 23 when resistance welding is performed.
[0038]
The manufacturing method of the battery device of the present invention does not need to be limited to the above-described contents, and in particular, the unit cell 18, the overheat protection element 19, the first connection member 24, the second connection member 25, and the protection circuit board 23 May be other than the order described above.
[0039]
In addition, since resistance welding is relatively easy and requires a short working time, and a device for performing resistance welding is relatively inexpensive and not large-scale, it is used in many connection parts in a battery device. However, when the connection between the electrode 14 of the unit cell 18 and the one lead 21a of the overheat protection element 19 and the connection between the battery cover 13 and the second connection member 25 of the unit cell 18 are performed by resistance welding, the resistance is reduced. When there is a concern that the welding may adversely affect the protection circuit 28, it is desirable to perform the above-described order.
[0040]
On the other hand, when there is no concern about the adverse effect on the protection circuit 28 due to resistance welding, there is a method according to the following sequence.
[0041]
First, the other end of the second connection member 25 is connected to the protection circuit board 23 in advance, and the other end of the first connection member 24 formed by connecting the other lead 21b of the overheat protection element 19 to one end. Are also connected to the protection circuit board 23 in advance.
[0042]
Next, one end of the second connection member 25 and the battery lid 13 are electrically connected. Then, when the protection circuit board 23 is bent in the direction of arrow A in FIG. 1 so that the protection circuit board 23 and the battery cover 13 face each other in parallel, as shown in FIGS. 2, 3A and 3B. The configuration is such that a part of the element section 20 of the overheat protection element 19 enters the storage section 27 having an opening provided in the protection circuit board 23. At this time, the one lead 21 a of the overheat protection element 19 overlaps the electrode 14 of the unit cell 18, and the overlapping portion is exposed to the storage portion 27 provided on the protection circuit board 23, This overlapping portion is electrically connected by a method such as resistance welding, laser welding, or soldering. In order to connect the one lead 21a of the overheat protection element 19, which is the overlapping portion, to the electrode 14 of the unit cell 18, some energy is required. This energy is supplied from an opening provided in the protection circuit board 23. Is supplied to the connection portion 22 between the one lead 21 a of the overheat protection element 19 and the electrode 14 of the unit cell 18 through the storage portion 27.
[0043]
When electrically connecting the overlapping portion of one lead 21a of the overheat protection element 19 and the electrode 14 of the unit cell 18, a method such as resistance welding, laser welding, or soldering is used. In order to eliminate the influence on the substrate 23, a means for protecting the IC or the like on the protection circuit substrate 23, for example, providing a return-type fuse or the like, or using an IC having excellent withstand current and withstand voltage is used. Means such as use can be considered.
[0044]
By performing the above manufacturing steps, a battery device as shown in FIG. 2 can be manufactured. In this manufacturing method, the first connection member 24 formed by connecting the other end of the second connection member 25 of the protection circuit board 23 in advance and connecting the other lead 21b of the overheat protection element 19 to one end thereof. Is also connected to the protection circuit board 23 in advance, so that the possibility of short-circuiting during the manufacturing process is reduced as compared with the case where one end is connected to the unit cell 18 with a lead or a connection member that is not restrained. It has an effect.
[0045]
As described above, the battery device of the present invention has been described using the first embodiment, but the present invention is not limited to the contents of the first embodiment, and various variations are possible.
[0046]
For example, in Embodiment 1 of the present invention, one pole (positive electrode) of the power generating element 11 in the unit cell 18 is connected to the electrode 14 facing the opening 13 a of the battery cover 13, and the other pole (negative electrode) ) Is electrically connected to the battery can 12 electrically connected to the battery lid 13, but this may be reversed. Further, the other pole (negative electrode) of the power generating element 11 is electrically connected to the entire case 15 including the battery can 12 and the battery cover 13, so that the entire case 15 is a negative electrode. By connecting the other electrode (negative electrode) of the power generating element 11 only to the bottom portion of the battery can 12 in the shape of a triangle, only the bottom portion of the battery can 12 may be used as a negative electrode and the other portions may be insulated. Good thing. In this case, there is no need to insulate the battery lid 13 from the other lead 21b of the overheat protection element 19. Further, the battery can 12 constituting the case 15 of the unit cell 18 is configured as a square cylinder with a bottom, but may be configured as a cylinder with a bottom. Further, the second connection member 25 connected to the protection circuit 28 of the protection circuit board 23 is connected to the battery lid 13, but may be connected to the bottom of the battery can 12. . Furthermore, the overheat protection element 19 is electrically connected between the electrode 14 facing the opening 13a of the battery lid 13 and the protection circuit board 23. The overheating protection element 19 may be electrically connected between the electrodes. In this case, the second connection member 25 connects the electrode 14 facing the opening 13a of the battery lid 13 to the protection circuit board 23. Will be connected.
[0047]
Further, in the first embodiment of the present invention, the storage portion 27 provided on the protection circuit board 23 is configured by the opening that is surrounded on all sides, but is not limited to this opening. Alternatively, for example, the storage portion 27 may be configured by a cutout portion formed by a cutout portion that is surrounded on three sides and one side is open, and furthermore, the surface side of the protection circuit board 23 facing the battery lid 13. May be provided with a storage portion 27 formed of a concave portion. Also in these cases, when the protection circuit board 23 is bent in the direction of arrow A in FIG. 1 so that the protection circuit board 23 and the battery cover 13 face in parallel, the protection circuit board 23 is formed of a missing portion or a recess provided on the protection circuit board 23. This is a configuration in which a part of the element section 20 of the overheat protection element 19 enters the storage section 27.
[0048]
As described above, in the first embodiment of the present invention, the element portion 20 of the overheat protection element 19 is inserted into the storage portion 27 formed of any one of the opening, the missing portion, and the recess provided in the protection circuit board 23. For this reason, the element portion 20 of the overheat protection element 19 and the protection circuit board 23 have an overlapping portion, and as a result, the size of the entire battery device can be reduced.
[0049]
In the first embodiment of the present invention, when the storage portion 27 provided on the protection circuit board 23 is constituted by an opening or a missing portion, one of the leads 21 a in the overheat protection element 19 and the electrode 14 Can be exposed from the opening or the missing portion, so that the connection state of the connection 22 between the one lead 21a of the overheat protection element 19 and the electrode 14 of the unit cell 18 can be visually checked from the outside. It has the effect that it can be easily known.
[0050]
(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
[0051]
FIG. 5 is an exploded perspective view of the battery device according to Embodiment 2 of the present invention. In FIG. 5, the same components as those of the first embodiment of the present invention shown in FIGS. 1, 2, 3 (a) and 3 (b) are denoted by the same reference numerals. The description is omitted, and only different points will be described.
[0052]
That is, in the battery device according to the second embodiment of the present invention, the element section 20 of the overheat protection element 19 is inserted into the storage section 27 having the opening provided in the protection circuit board 23, and a pair of the overheat protection element 19 is formed. Both leads 21a and 21b are directly connected to the surface of the protection circuit board 23 facing the battery cover 13. Further, in addition to the above, the battery device according to Embodiment 2 of the present invention electrically connects one end of the first connection member 24 to the electrode 14 of the unit cell 18 and the other end to the protection circuit board 23. And the other end of the second connection member 25 is electrically connected to the battery cover 13 of the unit cell 18 and the other end is connected to the protection circuit board 23, respectively. 18 are connected. In such a configuration, when the protection circuit board 23 is bent in the direction of arrow A, the protection circuit board 23 and the battery lid 13 face in parallel.
[0053]
In the battery device according to Embodiment 2 of the present invention, the element section 20 of the overheat protection element 19 is inserted into the storage section 27 formed by the opening provided in the protection circuit board 23, and a pair of the overheat protection element 19 is formed. Since both the leads 21a and 21b are directly connected to the protection circuit board 23, the positioning of the storage section 27 provided on the protection circuit board 23 and the element section 20 of the overheat protection element 19 can be performed more accurately. is there. In addition, since the alignment is easy, the size of the storage portion 27 including the opening provided in the protection circuit board 23 can be minimized. It is also possible to secure a mounting area for the components, thereby having an effect that the size of the battery device can be reduced.
[0054]
In the method for manufacturing a battery device according to Embodiment 2 of the present invention, the overheat protection element 19 is first connected to the protection circuit board 23, and then the first connection member 24 and the second connection member 25, the unit cell 18 and the protection circuit board 23 may be electrically connected. The connection method may be the same as the method of manufacturing the battery device according to the first embodiment of the present invention. Things.
[0055]
In the above-described second embodiment of the present invention, the storage section 27 provided on the protection circuit board 23 is configured by an opening that is surrounded on all sides, but is not limited to this opening. Other than this, even when the storage portion 27 is constituted by a cutout portion formed of a cutout portion which is surrounded on three sides and one of which is open, the same effects as those of the second embodiment of the present invention can be obtained. It is.
[0056]
(Embodiment 3)
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.
[0057]
FIG. 6 is an exploded perspective view of the battery device according to Embodiment 3 of the present invention. 6, the same components as those of the first embodiment of the present invention shown in FIGS. 1, 2, 3 (a) and 3 (b) are denoted by the same reference numerals. The description is omitted, and only different points will be described.
[0058]
That is, in the battery device according to Embodiment 3 of the present invention, of the pair of leads 21a and 21b of the overheat protection element 19, the other lead 21b is directly connected to the protection circuit board 23, and the element of the overheat protection element 19 The part 20 is inserted into the storage part 27 formed by the opening provided in the protection circuit board 23, and one of the leads 21 a and 21 b in the overheat protection element 19 is connected to the opening provided in the protection circuit board 23. It is configured to be exposed to the storage part 27 formed of a part. The protection circuit board 23 and the unit cell 18 are connected by electrically connecting one end of the second connection member 25 to the battery cover 13 of the unit cell 18 and the other end to the protection circuit board 23, respectively. are doing. In such a configuration, when the protection circuit board 23 is bent in the direction of arrow A in FIG. 6 so that the protection circuit board 23 and the battery cover 13 face in parallel, one lead 21a of the overheat protection element 19 is And the overlapping portion is exposed to the storage portion 27 formed by the opening provided in the protection circuit board 23. Therefore, this overlapping portion is subjected to resistance welding, laser welding, and soldering. Electrical connection by a method using energy such as In this case, the electrical connection between the one lead 21 a of the overheat protection element 19 and the electrode 14 of the unit cell 18, which is the overlapping portion, is performed by storing the energy required for making this connection in the storage section provided on the protection circuit board 23. The overheating protection element 19 is supplied to a connection between one lead 21 a of the overheat protection element 19 and the electrode 14 of the unit cell 18 through an opening constituting the element 27.
[0059]
In the method of manufacturing the battery device according to Embodiment 3 of the present invention, the overheat protection element 19 is first connected to the protection circuit board 23, and then the unit cell 18 is connected to the unit cell 18 by the second connection member 25. What is necessary is just to electrically connect with the protection circuit board 23, and the connection method should just be performed in the same method as the manufacturing method of the battery apparatus in Embodiment 1 of the present invention.
[0060]
According to the third embodiment of the present invention, the storage portion 27 provided on the protection circuit board 23 is constituted by an opening, and the element portion 20 of the overheat protection element 19 is inserted into the opening. Of the pair 21a, 21b, the connection between the one lead 21a and the electrode 14 of the unit cell 18 is exposed to the opening, so that one lead 21a of the overheat protection element 19 and the electrode of the unit cell 18 are exposed. The connection status of the connection portion with the connector 14 can be easily known from the outside by visual observation. In addition, one lead 21a of the overheat protection element 19 is overlapped on the electrode 14 of the unit cell 18, and this overlapping portion is exposed to the storage portion 27 formed by the opening provided in the protection circuit board 23, and the overlapping portion is exposed. Since the parts are electrically connected by a method such as resistance welding, laser welding, or soldering, the first connection member 24 is not required, and the number of parts can be reduced. It has the effect of becoming.
[0061]
In the third embodiment of the present invention, the electrical connection between the one lead 21a of the overheat protection element 19 and the electrode 14 of the unit cell 18 is performed by using the energy required for making this connection to the protection circuit board. 23 is supplied to the connection between one lead 21a of the overheat protection element 19 and the electrode 14 of the unit cell 18 by passing through an opening constituting the storage section 27 provided in 23. This has an effect that the connection between the one lead 21a of the overheat protection element 19 and the electrode 14 of the unit cell 18 can be performed, and at the same time, the positioning and fixing of the protection circuit board 23 to the unit cell 18 can be performed.
[0062]
In the third embodiment of the present invention, the storage section 27 provided on the protection circuit board 23 is configured by an opening that is surrounded on all sides, but is not limited to this opening. Other than this, even when the storage portion 27 is configured by a cutout portion formed by a cutout portion that is surrounded on three sides and one side is open, the same effect as that of the third embodiment of the present invention can be obtained. It is.
[0063]
【The invention's effect】
As described above, the battery device of the present invention includes a unit cell having a positive electrode and a negative electrode, an element unit for interrupting current when the unit cell is overheated, and a pair of leads provided on both sides of the element unit. And a protection circuit board electrically connected to the overheat protection element and at least controlling charging or discharging of the unit cells, and housed in the protection circuit board. Since the element portion of the overheat protection element is inserted into the storage portion, the element portion of the overheat protection element overlaps with the protection circuit board. Has an excellent effect that the size of the image can be reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a part of a battery device according to Embodiment 1 of the present invention in a cutaway manner.
FIG. 2 is a perspective view of the battery device after the protection circuit board is bent.
FIG. 3A is a partial vertical sectional view of the battery device.
(B) Top view of the battery device
FIG. 4 is a circuit diagram of the battery device.
FIG. 5 is an exploded perspective view showing a part of the battery device according to Embodiment 2 of the present invention in a cutaway manner.
FIG. 6 is an exploded perspective view showing a part of the battery device according to Embodiment 3 of the present invention in a cutaway manner.
FIG. 7 is a perspective view of a conventional battery device.
[Explanation of symbols]
11 Power generation elements
12 Battery cans
13 Battery cover
14 electrodes
15 cases
18 unit cells
19 Overheat protection element
20 element part
21a, 21b A pair of leads
22 Connection
23 Protection circuit board
24 First connection member
25 Second connection member
27 Storage section

Claims

A unit cell having a positive electrode and a negative electrode, an overheat protection element comprising a pair of leads provided on both sides of the element unit and the element unit for interrupting current when the unit cell overheats, and electrically connected to the unit cell; A protection circuit board that is electrically connected to the overheat protection element and controls at least the charge control or discharge control of the unit cell. A storage section is provided on the protection circuit board, and the overheat protection is provided in the storage section. A battery device in which the element part of the element is inserted.

2. The battery device according to claim 1, wherein the other of the pair of leads in the overheat protection element is electrically connected to the protection circuit board, and one of the leads is directly connected to either the positive electrode or the negative electrode of the unit cell.

The storage portion provided on the protection circuit board is constituted by an opening or a missing portion, and the element portion of the overheat protection element is inserted into the opening or the missing portion, and one of a pair of leads of the overheating protection element is provided. The battery device according to claim 1, wherein a connection portion between the battery and the unit cell is exposed to the opening or the missing portion.

2. The battery device according to claim 1, wherein the element portion of the overheat protection element is inserted into the storage section, and both the pair of leads of the overheat protection element are directly connected to the protection circuit board.

A unit cell having a positive electrode and a negative electrode, an element unit for interrupting current when the unit cell is overheated, and a pair of leads provided on both sides of the element unit, and one of the pair of leads is one of the unit cells An overheat protection element electrically connected to one of the electrodes, and a pair of leads of the overheat protection element, which is electrically connected to the other lead and controls at least charge control or discharge control of the unit cell. A protection circuit board to be performed, a first connection member for electrically connecting the other lead of the pair of leads in the overheat protection element to the protection circuit board, and the other electrode of the protection circuit board and the unit cell. And a second connection member for electrically connecting the one of the leads of the overheat protection element and one pole of the unit cell, and the other lead of the overheat protection element. After making electrical connection with one end of the first connection member and electrical connection between the other pole of the unit cell and one end of the second connection member, the other end of the first connection member A method for manufacturing a battery device, wherein an electrical connection is made between the protection circuit board and the other end of the second connection member.

Electrical connection between one lead of the overheat protection element and one pole of the unit cell, electrical connection between the other lead of the overheat protection element and one end of the first connection member, and the other pole of the unit cell And the other end of the second connection member is electrically connected by resistance welding, and the other end of the first connection member is electrically connected to the protection circuit board and the other end of the second connection member. 6. The method for manufacturing a battery device according to claim 5, wherein the electrical connection between the battery and the protection circuit board is performed by any of soldering, laser welding, and bonding.

A unit cell having a positive electrode and a negative electrode, an overheat protection element comprising a pair of leads provided on both sides of the element unit and the element unit for interrupting current when the unit cell overheats, and electrically connected to the unit cell; A protection circuit board that is electrically connected to the overheat protection element and controls at least charging or discharging of the unit cell, and electrically connects the other lead of the overheat protection element to the protection circuit board. And electrically connect the protection circuit board and the other pole of the unit cell via a second connection member, and then connect the overheating protection element to an opening or a cutout provided in the protection circuit board. A method of manufacturing a battery device in which one lead and one pole of a unit cell are exposed, and one lead of the exposed overheat protection element is electrically connected to one pole of the unit cell. .

The electrical connection between one lead of the overheat protection element and one pole of the unit cell is performed by passing the energy necessary for making this connection through an opening or a cutout provided in the protection circuit board. 8. The method for manufacturing a battery device according to claim 7, wherein the method is performed by supplying the power to a connection portion between one lead of the element and one pole of the unit cell.