JP2004319406A

JP2004319406A - Battery pack

Info

Publication number: JP2004319406A
Application number: JP2003115124A
Authority: JP
Inventors: Kanehito Masumoto; 兼人増本; Ryuichiro Ebi; 龍一郎海老; Toshiharu Kitagawa; 俊治北川
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2003-04-21
Filing date: 2003-04-21
Publication date: 2004-11-11

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack of which cost reduction is realized by constituting an identification terminal without using a circuit board mounted with a resistance element. <P>SOLUTION: A pair of connecting electrodes 5, 3 having different polarity are provided at one end of a battery 2 and external connectors 8, 9 are connected respectively to the pair of connecting electrodes 5, 3, and a resistance film coating 21 is applied on a part of the surface of any one external connector 9, thereby, a layer having a different resistance value is provided and an identification terminal part 20 is constituted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は電池パックに関し、特に電池の種類や特性を抵抗によって識別する識別端子部を設けた電池パックに関するものである。
【０００２】
【従来の技術】
近年、携帯電子機器の小型化、薄型化、並びに高機能化の進展が著しく、それに伴ってその電源となる電池も小型、薄型で高容量化が要求されている。小型で高容量を可能にする電池としてリチウム系電池が有効であり、中でも扁平な角形のリチウムイオン二次電池は機器の薄型化に好適であり、繰り返し使用できる電池として携帯電話などの携帯電子機器への適用が増加している。
【０００３】
ところで、各種機器の電源用の電池パックとして、電池と、過大電流の制限手段や過充放電に対する保護回路及び外部接続端子などを設けた回路基板とを、外部接続端子を露出させる窓部を有する外装ケース内に収納配置し、回路基板と電池の接続電極をリードで接続してなるものが知られている（例えば、特許文献１参照。）。
【０００４】
また、電池と、外部接続端子を設けた端子基板と、電子部品を、外装ケース内に収納配置し、端子基板の外部接続端子に電池及び電子部品を接続してなる電池パックも知られている（例えば、特許文献２参照。）。
【０００５】
また、電池の種類や特性などを識別できるように、外部接続端子の１つとして、電池の一方の接続電極や一方の外部接続端子に抵抗素子を介して接続してなる識別端子を設け、この識別端子から電池の種類などを識別して充電方式を切り換えるようにしたものも知られている（例えば、特許文献３参照。）。
【０００６】
このように回路基板や端子基板を外装ケースに保持させた電池パックの構成例を図３を参照して説明する。３１は扁平な角形の電池パックで、リチウムイオン二次電池からなる電池３２と、回路基板３３又は端子基板を、厚さ方向に２分割された外装ケース３４内に収納配置し、回路基板３３と電池３２の接続端子３５ａ、３５ｂをリード３６にて接続して構成されている。また、回路基板３３には、正極端子３３ａ、負極端子３３ｂ及び識別端子３３ｃなどの外部接続端子が設けられ、かつ保護回路などとともに識別端子３３ｃに接続される抵抗素子（図示せず）が実装されている。
【０００７】
電池３２は、電池ケース３７内に発電要素３８が収納されるとともに電池ケース３７の一端開口が一方の極性の接続端子３５ａを突設した封口部材３９にて絶縁ガスケット４０を介して封口され、電池ケース３７が他方の極性の接続端子３５ｂを構成している。また、外装ケース３４の一端壁４１には回路基板３３に設けられた外部接続端子を露出させる窓部４２が形成され、かつ回路基板３３を一端壁４１の内面に当接させた状態で保持する係合突部４４が設けられている。
【０００８】
【特許文献１】
特開２００２−２３１２０１号公報
【０００９】
【特許文献２】
特開平６−３３３５４７号公報
【００１０】
【特許文献３】
特開２０００−１８２６７７号公報
【００１１】
【発明が解決しようとする課題】
ところで、図３に示すような電池パック３１では、識別端子３３ｃを設けるために、回路基板３３に抵抗素子（図示せず）を実装する必要があり、さらにこの回路基板３３を外装ケース３４に位置決めした状態で保持させて固定する必要があるため、構成が複雑になってコスト高になるという問題があった。
【００１２】
本発明は、上記従来の問題点に鑑み、抵抗素子を実装した回路基板を用いずに識別端子部を構成することでコスト低下を図った電池パックを提供することを目的とする。
【００１３】
【課題を解決するための手段】
本発明の電池パックは、電池の何れか一方の極性の接続電極に接続された外部接続端子の表面に抵抗値の異なる層が設けられ識別端子部を構成したものであり、外部接続端子を有する端子基板に抵抗素子を実装することなく、識別端子部を構成できるので、コスト低下を図ることができる。
【００１４】
また、電池の一端部に極性の異なる一対の接続電極を配設し、一対の接続電極にそれぞれ外部接続端子を接続し、何れか一方の外部接続端子の表面の一部に抵抗皮膜コーティングを施して識別端子部を構成すると、一方の外部接続端子を共用してその表面の一部に抵抗皮膜コーティングを施して抵抗値の異なる層が設けられ、識別端子部を構成しているので、一層のコスト低下を図ることができる。
【００１５】
また、一対の接続電極は、電池ケースと電池ケースの一端開口の封口部材に設けられた接続電極からなると、電池ケースを接続電極とすることで電池構成を簡単にできて好適である。
【００１６】
また、一対の外部接続端子と識別端子部を各々露出させる窓部を有するとともに、少なくとも電池の一端部及び外部接続端子を覆う絶縁性のカバーを有すると、外部接続端子及び識別端子部を露出させる窓部を有するカバーにて電池ケースの一端部及び外部接続端子を覆った構成であるため、電池パックの構成が簡単になってさらにコスト低下を図ることができる。
【００１７】
【発明の実施の形態】
以下、本発明の一実施形態の電池パックについて、図１、図２を参照して説明する。
【００１８】
図１において、１は扁平な角形の電池パックで、リチウムイオン二次電池からなる電池２を備えている。電池２は、電池ケース３内に、正極板と負極板をセパレータを介して積層した極板群と電解液からなる発電要素４を収納して構成されており、電池ケース３の一端開口が一方の極性の接続電極５を突設した封口部材６にて絶縁ガスケット７を介して封口され、電池ケース３が他方の極性の接続電極を構成している。
【００１９】
電池２における接続電極５の側面には略Ｔ字状に成形された第１の外部接続端子８が、電池ケース３の一端部側面には略Ｌ字状に成形された第２の外部接続端子９が、それぞれ抵抗溶接による溶接部１０にて接続されている。本実施形態では、第１の外部接続端子８が正極端子、第２の外部接続端子９が負極端子とされている。これら第１と第２の外部接続端子８、９の接続時には、電池２の一端面と平行な金メッキが施されている端子面８ａ、９ａと電池ケース３の他端面３ａとの間の寸法を、所定の寸法ｈに規制した状態で、接続脚部８ｂ、９ｂを各々接続電極５の側面と電池ケース３の一端部側面に当接させて抵抗溶接接続されている。なお、抵抗溶接に代えてレーザビーム溶接や電子ビーム溶接などを適用しても良い。
【００２０】
これら電池ケース３の一端部と外部接続端子８、９は、合成樹脂成形品からなる絶縁性のカバー１１にて覆われている。このカバー１１は、電池ケース３の横断面形状と略同一の横断面形状でかつ一端面が端壁１１ａにて閉鎖された縦断面形状コ字状で、その端壁１１ａの内面を外部接続端子８、９の端子面８ａ、９ａに係合させて位置決めした状態で電池ケース３の一端部に装着されている。カバー１１の両側には電池ケース３の長側面に重なって外部接続端子９の接続脚部９ｂを覆う延出部１４が設けられている。また、カバー１１の延出部１４を含む下部と電池ケース３の外周面がフィルム状外装材１５にて被覆されている。
【００２１】
第２の外部接続端子９は、図２（ａ）に示すように、これら外部接続端子８、９の並設方向の幅寸法が、第１の外部接続端子８の略２倍程度に形成され、かつその金メッキが施されている端子面９ａの第１の外部接続端子８に近い側の一半部の表面上に、抵抗値の異なる層が設けられ識別端子部２０が構成されている。この識別端子部２０を構成するには、カーボンブラック、黒鉛等の導電剤、エポキシ樹脂、フェノール樹脂等の樹脂、シリカ、マイカ、タルク等の無機充填剤、必要に応じて硬化剤を溶剤に混練分散させたペーストを金メッキが施されている端子面９ａの第１の外部接続端子８に近い側の一半部の表面上に印刷により構成し、焼き付けることにより、金メッキが施されている端子面９ａよりも抵抗値が高い１０ｋΩ〜２００ｋΩとなるように抵抗皮膜コーティング２１を容易に作製することができる。そして、図２（ｂ）に示すように、カバー１１の端壁１１ａには、正極端子としての第１の外部接続端子８の端子面８ａを露出させる窓部２２と、負極端子としての第２の外部接続端子９の端子面９ａを露出させる窓部２３と、これら窓部２２、２３の間で識別端子部２０を露出させる窓部２４とが開口されている。
【００２２】
なお、図２（ｂ）において、１６は、電池ケース３の長側面上に突出している第２の外部接続端子９の接続脚部９ｂを収納するように、カバー１１の延出部１４に形成された開口である。この開口１６に代えて、図１（ｃ）に示すように、凹部を形成しても良い。
【００２３】
以上の構成の電池パック１によれば、第２の外部接続端子９の表面に施した抵抗皮膜コーティング２１にて識別端子部２０を構成しているので、従来のように識別端子部２０を構成するために回路基板や端子基板に抵抗素子を実装する必要がなく、構成を簡単にできてコスト低下を図ることができる。
【００２４】
また、電池２の一端部の封口部材６に設けた接続電極５と電池ケース３の一端部にそれぞれ第１と第２の外部接続端子８、９を接続し、第２の外部接続端子９の端子面９ａの一部に抵抗皮膜コーティング２１を施して抵抗値の異なる層が設けられ識別端子部２０を構成しているため、電池ケース３の一端部を一方の接続電極とした簡単な電池構成の電池２を用いかつ第２の外部接続端子９を共用してその表面の一部に識別端子部２０を構成していることで一層のコスト低下を図ることができる。
【００２５】
また、一対の外部接続端子８、９及び識別端子部２０を露出させる窓部２２、２３、２４を有するカバー１１にて電池ケース３の一端部及び外部接続端子８、９を覆い、このカバー１１の一部と電池ケース３の外周面をフィルム状外装材１５で覆って電池パック１を構成しているので、従来の外装ケースを用いた構成に比して簡単でかつ少ない部品からなるとともに生産性良く製作でき、電池パック１のコスト低下をさらに図ることができる。
【００２６】
また、第１と第２の外部接続端子８、９を、電池ケース３の他端とこれら外部接続端子８、９の端子面８ａ、９ａとの間の寸法ｈを規制した状態で電池ケース３の一端部の接続電極５、３にそれぞれ接続し、かつこの電池ケース３の一端部及び外部接続端子８、９を覆うカバー１１をこれら外部接続端子８、９の端子面８ａ、９ａで係合位置決めした状態で電池ケース３に装着しているので、図１（ｂ）に示すように、カバー１１の端壁１１ａの厚さをｔとすると、電池パック１の総高さ寸法Ｈは、端子面８ａ、９ａと電池ケース３の他端面３ａとの間の寸法ｈと、この厚さ寸法ｔの和で与えられる。かくして、寸法ｔは小さいのでその誤差は小さく規制できるため、寸法ｈを上記のように規制することで、総高さ寸法Ｈを精度よく規制することができる。かくして、この電池パック１を携帯電子機器にセットした時に、外部接続端子８、９の接続状態について高い信頼性を得ることができる。
【００２７】
【発明の効果】
本発明の電池パックによれば、電池の何れか一方の極性の接続電極に接続された外部接続端子の表面に抵抗皮膜コーティングを施して抵抗値の異なる層が設けられ、識別端子部を構成したものであり、外部接続端子を有する端子基板に抵抗素子を実装することなく、識別端子部を構成できるので、コスト低下を図ることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態の電池パックを示し、（ａ）は斜視図、（ｂ）は（ａ）のＡ−Ａ矢視拡大断面図、（ｃ）は（ａ）のＢ−Ｂ矢視拡大断面図である。
【図２】同実施形態の要部構成を示し、（ａ）は識別端子部を設けた外部接続端子を示す斜視図、（ｂ）はカバーで覆った状態の斜視図である。
【図３】従来例の電池パックを示し、（ａ）は斜視図、（ｂ）は（ａ）のＣ−Ｃ矢視拡大断面図である。
【符号の説明】
１電池パック
３電池ケース（接続電極）
５接続電極
８第１の外部接続端子
９第２の外部接続端子
１１カバー
２０識別端子部
２１抵抗皮膜コーティング
２２窓部
２３窓部
２４窓部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery pack, and more particularly to a battery pack provided with an identification terminal for identifying the type and characteristics of a battery by resistance.
[0002]
[Prior art]
2. Description of the Related Art In recent years, portable electronic devices have been significantly reduced in size, thickness, and function, and accordingly, batteries serving as power sources have been required to be smaller, thinner, and have higher capacities. Lithium-based batteries are effective as small and high-capacity batteries. Among them, flat rectangular lithium-ion rechargeable batteries are suitable for thinning devices, and portable electronic devices such as mobile phones are reusable batteries. The application to is increasing.
[0003]
By the way, as a battery pack for power supply of various devices, a battery and a circuit board provided with a means for limiting excessive current, a protection circuit for overcharging and discharging, an external connection terminal, and the like are provided with a window for exposing the external connection terminal. 2. Description of the Related Art There is known a device in which a circuit board and a connection electrode of a battery are connected to each other by a lead and housed in an outer case (for example, see Patent Document 1).
[0004]
A battery pack is also known in which a battery, a terminal board provided with external connection terminals, and an electronic component are housed and arranged in an outer case, and the battery and the electronic component are connected to the external connection terminals of the terminal board. (For example, see Patent Document 2).
[0005]
In order to identify the type and characteristics of the battery, an identification terminal is provided as one of the external connection terminals, which is connected to one of the connection electrodes of the battery or one of the external connection terminals via a resistance element. There is also known a device in which the type of the battery is identified from the identification terminal and the charging method is switched (for example, see Patent Document 3).
[0006]
A configuration example of the battery pack in which the circuit board and the terminal board are held in the outer case as described above will be described with reference to FIG. Reference numeral 31 denotes a flat rectangular battery pack, in which a battery 32 made of a lithium ion secondary battery and a circuit board 33 or a terminal board are housed and arranged in an outer case 34 divided into two parts in the thickness direction. The connection terminals 35 a and 35 b of the battery 32 are connected by leads 36. Further, the circuit board 33 is provided with external connection terminals such as a positive terminal 33a, a negative terminal 33b, and an identification terminal 33c, and is mounted with a resistance element (not shown) connected to the identification terminal 33c together with a protection circuit and the like. ing.
[0007]
The battery 32 has a power generation element 38 housed in a battery case 37 and one end opening of the battery case 37 is sealed via an insulating gasket 40 by a sealing member 39 having a connection terminal 35a of one polarity protruding therefrom. The case 37 constitutes the connection terminal 35b of the other polarity. A window 42 for exposing external connection terminals provided on the circuit board 33 is formed in one end wall 41 of the outer case 34, and the circuit board 33 is held in a state of being in contact with the inner surface of the one end wall 41. An engagement protrusion 44 is provided.
[0008]
[Patent Document 1]
JP-A-2002-231201
[Patent Document 2]
JP-A-6-333547
[Patent Document 3]
Japanese Patent Application Laid-Open No. 2000-182677
[Problems to be solved by the invention]
By the way, in the battery pack 31 as shown in FIG. 3, it is necessary to mount a resistance element (not shown) on the circuit board 33 in order to provide the identification terminal 33c, and further position the circuit board 33 on the outer case. Since it is necessary to hold and fix in a state where it has been made, there is a problem that the configuration is complicated and the cost is increased.
[0012]
The present invention has been made in view of the above-described conventional problems, and has as its object to provide a battery pack in which cost is reduced by forming an identification terminal portion without using a circuit board on which a resistance element is mounted.
[0013]
[Means for Solving the Problems]
The battery pack of the present invention has a structure in which a layer having a different resistance value is provided on the surface of an external connection terminal connected to a connection electrode of either polarity of the battery to constitute an identification terminal portion, and has an external connection terminal. Since the identification terminal portion can be configured without mounting the resistance element on the terminal board, the cost can be reduced.
[0014]
In addition, a pair of connection electrodes having different polarities is provided at one end of the battery, external connection terminals are connected to the pair of connection electrodes, and a part of the surface of one of the external connection terminals is coated with a resistive film. When the identification terminal portion is configured, a layer having a different resistance value is provided by applying a resistive film coating to a part of the surface while sharing one of the external connection terminals, and the identification terminal portion is formed. Cost can be reduced.
[0015]
In addition, when the pair of connection electrodes includes a battery case and a connection electrode provided on a sealing member at one end opening of the battery case, the battery configuration can be simplified by using the battery case as the connection electrode, which is preferable.
[0016]
In addition, a pair of external connection terminals and a window for exposing the identification terminal are provided, and an insulating cover covering at least one end of the battery and the external connection terminal is provided to expose the external connection terminal and the identification terminal. Since the battery cover has one end and an external connection terminal covered by a cover having a window, the structure of the battery pack can be simplified and the cost can be further reduced.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a battery pack according to an embodiment of the present invention will be described with reference to FIGS.
[0018]
In FIG. 1, reference numeral 1 denotes a flat rectangular battery pack having a battery 2 made of a lithium ion secondary battery. The battery 2 includes a battery case 3 and a power generating element 4 composed of an electrolyte and an electrode plate group in which a positive electrode plate and a negative electrode plate are stacked with a separator interposed therebetween. Is sealed via an insulating gasket 7 with a sealing member 6 protrudingly provided with a connection electrode 5 having a negative polarity, and the battery case 3 constitutes a connection electrode having the other polarity.
[0019]
A first external connection terminal 8 formed in a substantially T shape is formed on a side surface of the connection electrode 5 in the battery 2, and a second external connection terminal formed in a substantially L shape is formed on a side surface of one end of the battery case 3. 9 are connected at a welding portion 10 by resistance welding. In the present embodiment, the first external connection terminal 8 is a positive terminal, and the second external connection terminal 9 is a negative terminal. When the first and second external connection terminals 8 and 9 are connected, the dimension between the gold-plated terminal surfaces 8a and 9a parallel to one end surface of the battery 2 and the other end surface 3a of the battery case 3 is reduced. The connection legs 8b and 9b are respectively connected to the side surfaces of the connection electrode 5 and one end of the battery case 3 in a state of being regulated to a predetermined dimension h, and are connected by resistance welding. Note that laser beam welding, electron beam welding, or the like may be used instead of resistance welding.
[0020]
One end of the battery case 3 and the external connection terminals 8 and 9 are covered with an insulating cover 11 made of a synthetic resin molded product. The cover 11 has a U-shaped vertical cross-section having substantially the same cross-sectional shape as that of the battery case 3 and one end face closed by an end wall 11a. The inner surface of the end wall 11a is connected to an external connection terminal. The battery case 3 is mounted on one end of the battery case 3 in a state where it is positioned by being engaged with the terminal surfaces 8a and 9a. On both sides of the cover 11, extending portions 14 are provided which overlap the long side surfaces of the battery case 3 and cover the connection legs 9 b of the external connection terminals 9. Further, a lower portion including the extension portion 14 of the cover 11 and an outer peripheral surface of the battery case 3 are covered with a film-like exterior material 15.
[0021]
As shown in FIG. 2A, the width of the second external connection terminals 9 in the direction in which the external connection terminals 8 and 9 are juxtaposed is approximately twice as large as that of the first external connection terminals 8. On the surface of one half of the gold-plated terminal surface 9a on the side close to the first external connection terminal 8, layers having different resistance values are provided to constitute the identification terminal portion 20. In order to form the identification terminal portion 20, a conductive agent such as carbon black and graphite, a resin such as an epoxy resin and a phenol resin, an inorganic filler such as silica, mica, and talc, and a curing agent as necessary are kneaded with a solvent. The dispersed paste is formed by printing on the surface of one half of the gold-plated terminal surface 9a on the side close to the first external connection terminal 8, and is baked to form the gold-plated terminal surface 9a. The resistance film coating 21 can be easily manufactured so as to have a resistance value higher than 10 kΩ to 200 kΩ. Then, as shown in FIG. 2B, the end wall 11a of the cover 11 has a window 22 for exposing the terminal surface 8a of the first external connection terminal 8 as a positive terminal, and a second portion as a negative terminal. A window 23 for exposing the terminal surface 9a of the external connection terminal 9 and a window 24 for exposing the identification terminal 20 between the windows 22 and 23 are opened.
[0022]
In FIG. 2B, reference numeral 16 denotes an extension formed on the extension 11 of the cover 11 for accommodating the connection leg 9b of the second external connection terminal 9 protruding on the long side surface of the battery case 3. Opening. Instead of the opening 16, a concave portion may be formed as shown in FIG.
[0023]
According to the battery pack 1 having the above configuration, since the identification terminal portion 20 is formed by the resistance film coating 21 applied to the surface of the second external connection terminal 9, the identification terminal portion 20 is configured as in the related art. Therefore, it is not necessary to mount a resistance element on a circuit board or a terminal board, so that the configuration can be simplified and the cost can be reduced.
[0024]
Also, the first and second external connection terminals 8 and 9 are connected to the connection electrode 5 provided on the sealing member 6 at one end of the battery 2 and one end of the battery case 3, respectively. A simple battery configuration in which one end of the battery case 3 is used as one connection electrode because the identification terminal portion 20 is formed by providing a resistance film coating 21 on a part of the terminal surface 9a and providing layers having different resistance values. By using the battery 2 and sharing the second external connection terminal 9 to form the identification terminal portion 20 on a part of the surface, the cost can be further reduced.
[0025]
One end of the battery case 3 and the external connection terminals 8 and 9 are covered with a cover 11 having windows 22, 23 and 24 for exposing the pair of external connection terminals 8 and 9 and the identification terminal 20, and the cover 11 Of the battery case 3 and the outer peripheral surface of the battery case 3 are covered with the film-like exterior material 15 to constitute the battery pack 1. The battery pack 1 can be manufactured with good performance, and the cost of the battery pack 1 can be further reduced.
[0026]
The first and second external connection terminals 8 and 9 are connected to the battery case 3 in a state where the dimension h between the other end of the battery case 3 and the terminal surfaces 8a and 9a of the external connection terminals 8 and 9 is regulated. Of the battery case 3 and the cover 11 covering the one end of the battery case 3 and the external connection terminals 8 and 9 are engaged with the terminal surfaces 8a and 9a of the external connection terminals 8 and 9 respectively. Since the battery case 3 is mounted on the battery case 3 in the positioned state, as shown in FIG. 1B, when the thickness of the end wall 11a of the cover 11 is t, the total height H of the battery pack 1 is It is given by the sum of a dimension h between the surfaces 8a, 9a and the other end face 3a of the battery case 3 and this thickness dimension t. Thus, since the dimension t is small, the error can be regulated to be small. Therefore, by regulating the dimension h as described above, the total height dimension H can be regulated with high accuracy. Thus, when the battery pack 1 is set in a portable electronic device, high reliability of the connection state of the external connection terminals 8 and 9 can be obtained.
[0027]
【The invention's effect】
According to the battery pack of the present invention, a layer having a different resistance value is provided by applying a resistance film coating to the surface of the external connection terminal connected to the connection electrode of either polarity of the battery, thereby forming an identification terminal portion. In this case, the identification terminal portion can be configured without mounting the resistance element on the terminal board having the external connection terminal, so that the cost can be reduced.
[Brief description of the drawings]
1A and 1B show a battery pack according to an embodiment of the present invention, wherein FIG. 1A is a perspective view, FIG. 1B is an enlarged cross-sectional view taken along the line AA of FIG. FIG. 4 is an enlarged cross-sectional view as viewed in the direction of arrow B.
FIGS. 2A and 2B show a main configuration of the embodiment, in which FIG. 2A is a perspective view showing an external connection terminal provided with an identification terminal section, and FIG. 2B is a perspective view showing a state covered with a cover.
3A and 3B show a conventional battery pack, in which FIG. 3A is a perspective view, and FIG. 3B is an enlarged cross-sectional view of FIG.
[Explanation of symbols]
1 Battery pack 3 Battery case (connection electrode)
5 Connection Electrode 8 First External Connection Terminal 9 Second External Connection Terminal 11 Cover 20 Identification Terminal 21 Resistive Film Coating 22 Window 23 Window 24 Window

Claims

A battery pack in which a layer having a different resistance value is provided on a surface of an external connection terminal connected to a connection electrode of either polarity of a battery to constitute an identification terminal portion.

A pair of connection electrodes having different polarities is arranged at one end of the battery, external connection terminals are connected to the pair of connection electrodes, respectively, and a part of the surface of one of the external connection terminals is coated with a resistive film and identified. The battery pack according to claim 1, wherein the battery pack comprises a terminal portion.

3. The battery pack according to claim 2, wherein the pair of connection electrodes includes a battery case and connection electrodes provided on a sealing member at one end opening of the battery case.

The battery pack according to claim 2, further comprising a window for exposing the pair of external connection terminals and the identification terminal, and an insulating cover for covering at least one end of the battery and the external connection terminals.