JP5046568B2 - Battery pack - Google Patents

Battery pack Download PDF

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JP5046568B2
JP5046568B2 JP2006167371A JP2006167371A JP5046568B2 JP 5046568 B2 JP5046568 B2 JP 5046568B2 JP 2006167371 A JP2006167371 A JP 2006167371A JP 2006167371 A JP2006167371 A JP 2006167371A JP 5046568 B2 JP5046568 B2 JP 5046568B2
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positive
terminal
circuit board
battery pack
external connection
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JP2007335289A (en
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信行 菅原
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Envision AESC Energy Devices Ltd
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NEC Energy Devices Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

本発明は電池パックに関し、ラミネートフィルムで密閉されたリチウム二次電池と保護回路基板を組合わせた電池パックに関するものである。   The present invention relates to a battery pack, and relates to a battery pack in which a lithium secondary battery sealed with a laminate film and a protective circuit board are combined.

ラミネートフィルムで外装されたラミネート型リチウム二次電池には、通常過充電、過放電等から電池を保護するため保護回路基板が搭載され電池パックとしている。図４は従来の電池パックの分解斜視図である。電池パックは、ラミネート型リチウム二次電池１１１と保護回路基板２１１が接続された構造となっている。ラミネート型リチウム二次電池１１１からは正極端子１１２並びに負極端子１１３が引き出され、正極端子１１２にはさらに延長接続するための正極端子片１１４が取り付けられている。また、保護回路基板２１１には、ラミネート型リチウム二次電池１１１と接続するための正極接続用並びに負極接続用ランド２１２、２１３が設けられており、それぞれの正負極接続用ランド２１２、２１３に正極接続用端子３１１並びに負極接続用端子３１２が半田により接合され、さらに半田部分の盛り上がり部分の保護のためクッション材５１１を配置し、また外部接続のため設けられた正負極ランドと外部接続用リード線４１１が半田により接合される。次に、ラミネート型リチウム二次電池１１１から正極端子１１２を介して接続された正極端子片１１４並びに負極端子１１３と保護回路基板２１１に接合された正負極接続用端子３１１、３１２が溶接により接続される。このように組み立てられた後はラミネート型リチウム二次電池１１１の端面から保護回路基板２１１端面までは平板状に延びた形状になっている。   A laminated lithium secondary battery covered with a laminate film is usually equipped with a protective circuit board to protect the battery from overcharge, overdischarge, etc., to form a battery pack. FIG. 4 is an exploded perspective view of a conventional battery pack. The battery pack has a structure in which a laminated lithium secondary battery 111 and a protective circuit board 211 are connected. A positive electrode terminal 112 and a negative electrode terminal 113 are drawn out from the laminated lithium secondary battery 111, and a positive electrode terminal piece 114 for further extending connection is attached to the positive electrode terminal 112. Further, the protective circuit board 211 is provided with positive and negative electrode connecting lands 212 and 213 for connection to the laminated lithium secondary battery 111, and the positive and negative electrode connecting lands 212 and 213 have positive electrodes. The connection terminal 311 and the negative electrode connection terminal 312 are joined by soldering, and a cushion material 511 is disposed for protecting the raised portion of the solder portion, and the positive and negative electrode lands provided for external connection and the external connection lead wire 411 is joined by solder. Next, the positive electrode terminal piece 114 connected from the laminated lithium secondary battery 111 via the positive electrode terminal 112 and the negative electrode terminal 113 and the positive and negative electrode connecting terminals 311 and 312 bonded to the protective circuit board 211 are connected by welding. The After being assembled in this manner, the end surface of the laminated lithium secondary battery 111 to the end surface of the protective circuit board 211 has a shape extending in a flat plate shape.

電池パックとして使用する際には、正負極端子１１２、１１３が露出しているため取り扱いによっては破断の恐れがあり、また端子間の距離が短いため端子曲がりによる短絡を生じるおそれがある。図５は、従来の電池パックの組み立てを説明する図であり、図５（ａ）は組み立て途中工程の斜視図、図５（ｂ）は組み立て後の斜視図である。ラミネート型リチウム二次電池１１１から延出された負極端子１１３と正極端子１１２と正極端子片１１４並びに保護回路基板２１１に接合された正負極接続用端子３１１、３１２を、図５（ａ）に示すように複数回（図５の場合は３回）折り曲げ、ラミネート型リチウム二次電池１１１の収納部１１５に図５（ｂ）に示すように配置するのが一般的である（例えば特許文献１参照）。   When used as a battery pack, the positive and negative terminals 112 and 113 are exposed, so there is a risk of breakage depending on the handling, and a short distance between the terminals may cause a short circuit due to terminal bending. 5A and 5B are diagrams for explaining assembly of a conventional battery pack, in which FIG. 5A is a perspective view of an assembling process, and FIG. 5B is a perspective view after assembly. FIG. 5A shows the negative electrode terminal 113, the positive electrode terminal 112, the positive electrode terminal piece 114, and the positive and negative electrode connection terminals 311 and 312 joined to the protective circuit board 211, which are extended from the laminated lithium secondary battery 111. As shown in FIG. 5 (b), it is common to bend a plurality of times (three times in the case of FIG. 5) as shown in FIG. 5 (b) in the storage portion 115 of the laminated lithium secondary battery 111. ).

特開２００５−１６６６４４号公報JP 2005-166644 A

しかしながら、従来の電池パックにおいては、ラミネート型リチウム二次電池の端面から保護基板の端面までは平板状に延びておりラミネート型リチウム二次電池の収納部分に配置するためには煩雑な折り曲げあるいは２回以上の折り畳み工程が必要となっていた。また、折り曲げ、折り畳み回数に応じ各端子において曲げの戻りが発生するため収納部において厚みが増すのとクッション材の厚みが加わり、さらに厚みが増す問題が発生する。さらに、保護回路基板に対するストレスも折り曲げ、折り畳み回数分加わるため実装部品の接続が破断する恐れがある。   However, in the conventional battery pack, the end surface of the laminated lithium secondary battery extends to the end surface of the protective substrate in a flat plate shape. More than one folding process was required. In addition, since bending returns at each terminal according to the number of times of folding and folding, a problem arises in that the thickness of the storage portion increases and the thickness of the cushioning material increases, which further increases the thickness. Furthermore, since the stress on the protective circuit board is also bent and applied by the number of times of folding, the connection of the mounted components may be broken.

本発明は、電池パック組み立て時の折り曲げ、折り畳みを最小限にして、部品を低減し、組立作業を簡素化し、厚さを抑え、保護回路基板へのストレスの少ない信頼性の高い電池パックを提供するものである。   The present invention provides a highly reliable battery pack which minimizes bending and folding during battery pack assembly, reduces parts, simplifies assembly work, suppresses thickness, and reduces stress on the protective circuit board. To do.

本発明の電池パックによれば、リチウム二次電池から引き出された平板状の正極端子と負極端子にそれぞれ穴を設け、保護回路基板上の外部接続用正極ランドと外部接続用負極ランドにそれぞれ穴を設け、前記正極端子及び前記負極端子に設けられた穴と、前記外部接続用正極ランド及び前記外部接続用負極ランドに設けられた穴をクランプ材の内側に設けた突起によりそれぞれ位置決めし、前記クランプ材で前記正極端子及び前記負極端子と前記外部接続用正極ランド及び前記外部接続用負極ランドを前記保護回路基板上の保護回路を通してそれぞれ接続固定し、前記クランプ材は導電性を備え、前記正極端子及び前記負極端子と前記クランプ材とは絶縁されていることを特徴とする。また、前記保護回路基板に切り欠きを設け、前記クランプ材に設けた固定用フックを前記切り欠きに嵌合し前記保護回路基板を固定してもよいし、また前記クランプ材の内側に設けた突起が絶縁処理されてもよいし、また前記正極端子又は前記負極端子とクランプ材との間に絶縁用樹脂板を設けてもよい。 According to the battery pack of the present invention, holes are respectively provided in the flat positive electrode terminal and the negative electrode terminal drawn out from the lithium secondary battery, and holes are respectively formed in the external connection positive electrode land and the external connection negative electrode land on the protective circuit board. the provided, said a hole provided to the positive terminal and the negative terminal, the positioning respectively by projections provided with holes provided on the inner side of the clamping member to the positive electrode land and the external connection negative land for external connection , the positive terminal and the negative terminal and the external connection positive electrode land and a negative electrode land for the external connection with the clamping member respectively fixedly connected through a protection circuit of the protection circuit board, the clamping member is conductive And the positive electrode terminal, the negative electrode terminal, and the clamp member are insulated . Furthermore, provided a notch on the protection circuit board, to the fixing hooks provided in the clamp member may be fixed to the protection circuit board fits into notch the cut, also provided inside of the clamping member The protrusion may be insulated, or an insulating resin plate may be provided between the positive terminal or the negative terminal and the clamp member .

本発明の電池パックによれば、リチウム二次電池から引き出された正負極端子と、保護回路基板をクランプ材で固定することにより、正負極端子の延長部材が不要となり、折り曲げあるいは折り畳みが１回となるとともにクッション材も不要となり組立作業が簡素化されると共に厚さが抑えられ省スペース化に寄与できる等の効果がある。   According to the battery pack of the present invention, the positive and negative terminals drawn out from the lithium secondary battery and the protective circuit board are fixed with the clamp material, so that the positive and negative terminals are not required to be extended, and the folding or folding is performed once. In addition, the cushioning material is not required, and the assembling work is simplified and the thickness is reduced, thereby contributing to space saving.

次に、本発明の実施の形態を図面を参照して説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の第一の実施の形態の電池パックの分解斜視図である。本発明の電池パックの構成について、電池としてラミネート型リチウム二次電池を用いた場合について説明する。本発明の第一の実施の形態の電池パックは、図１に示すようにラミネート型リチウム二次電池１から引き出された正極端子２並びに負極端子３と、保護回路基板１１の正負極接続用ランド（保護回路基板は裏面からの斜視図であり正極接続用ランド並びに負極接続用ランドは図示できない）及び保護回路基板１１の裏面の外部接続用正極ランド１２並びに外部接続用負極ランド１３をクランプ材２１にて、嵌合接続を行い、電池から引き出された正負極端子を１回折り畳み、収納部分（ラミネート型リチウム二次電池は裏面からの斜視図であり収納部分は図示できない）に配置する電池パックであり、ラミネート型リチウム二次電池１の正負極端子２、３と保護回路基板１１の正負極接続用ランドを接続し、保護回路基板１１上の外部接続用正負極用ランド１２、１３から外部接続用リード線３１により電力を供給する。そのためクランプ材２１はバネ性と導電性を備えている。また、クランプによりラミネート型リチウム二次電池１の正負極端子２、３と保護回路基板１１の正負極接続用ランド並びに外部接続用正負極用ランド１２、１３を同時に嵌合接続するが、この状態では保護回路基板を介さずに直接外部に電力供給を行うため電池保護の回路基板は機能を果たさないので都合が悪い、そこで、ラミネート型リチウム二次電池１の正負極端子２、３をクランプする部分には絶縁処理が施されている。即ち、電気的には外部接続用正負極用ランド１２、１３から保護回路基板上の保護回路を通して正負極端子２、３に通じている。   FIG. 1 is an exploded perspective view of the battery pack according to the first embodiment of the present invention. The configuration of the battery pack of the present invention will be described in the case where a laminated lithium secondary battery is used as the battery. As shown in FIG. 1, the battery pack according to the first embodiment of the present invention includes a positive electrode terminal 2 and a negative electrode terminal 3 drawn out from a laminated lithium secondary battery 1, and a positive / negative electrode connection land of a protection circuit board 11. (The protective circuit board is a perspective view from the back side, and the positive connection land and the negative connection land cannot be shown) and the external connection positive land 12 and the external connection negative land 13 on the back surface of the protection circuit board 11 are clamped 21 In the battery pack, the mating connection is made, the positive and negative terminals pulled out from the battery are folded once and placed in the storage part (the laminated lithium secondary battery is a perspective view from the back side and the storage part cannot be shown). The positive and negative terminals 2 and 3 of the laminated lithium secondary battery 1 and the positive and negative electrode connection lands of the protective circuit board 11 are connected to each other for external connection on the protective circuit board 11 Supplying power by an external connecting lead wire 31 from the negative electrode lands 12 and 13. Therefore, the clamp member 21 has springiness and conductivity. Further, the positive and negative terminals 2 and 3 of the laminated lithium secondary battery 1 and the positive and negative electrode connection lands of the protective circuit board 11 and the external connection positive and negative lands 12 and 13 are simultaneously fitted and connected by clamping. Then, since power is directly supplied to the outside without going through the protection circuit board, the circuit board for battery protection does not function, so it is not convenient. Therefore, the positive and negative terminals 2 and 3 of the laminated lithium secondary battery 1 are clamped. The part is subjected to insulation treatment. In other words, the positive and negative lands 12 and 13 for external connection are electrically connected to the positive and negative terminals 2 and 3 through the protective circuit on the protective circuit board.

また、上記電池パックでは、接続後の位置ずれを引き起こすことを防止するため、ラミネート型リチウム二次電池１から引き出された正負極端子２、３には所定の取り付け穴４を設けておき、また保護回路基板１１の正負極接続用ランド及び基板裏面には外部接続用正極ランド１２、並びに外部接続用負極ランド１３に穴１４を設け、さらに保護回路基板１１に切り欠き１５を設け、クランプ材２１には絶縁処理された突起２３と固定用フック２２を形成している。また、クランプ材２１には外部接続用リード線３１が半田により接合されている。   Further, in the battery pack, in order to prevent displacement after connection, predetermined attachment holes 4 are provided in the positive and negative terminals 2 and 3 drawn from the laminated lithium secondary battery 1, Holes 14 are provided in the positive and negative electrode lands 12 and the negative electrode land 13 for external connection on the positive and negative electrode connecting lands and the back surface of the protective circuit board 11, and the notch 15 is provided in the protective circuit board 11. Are formed with insulating projections 23 and fixing hooks 22. Further, an external connection lead wire 31 is joined to the clamp member 21 by solder.

ラミネート型リチウム二次電池１の正負極端子２、３及び保護回路基板１１は、各々の取り付け穴４、および穴１４を基準に位置を合わせ、クランプ材２１の絶縁処理された突起２３により嵌合接続並びに固定がなされ、また保護回路基板１１とクランプ材２１は保護回路基板１１の切り欠き１５とクランプ材２１の固定用フック２２により嵌合し安定的な固定がなされる。   The positive and negative terminals 2 and 3 and the protective circuit board 11 of the laminated lithium secondary battery 1 are aligned with respect to the respective mounting holes 4 and 14, and are fitted by insulating projections 23 of the clamp material 21. The protective circuit board 11 and the clamp member 21 are fitted and fixed by the notch 15 of the protective circuit board 11 and the fixing hook 22 of the clamp member 21 so as to be stably fixed.

図２は、本発明の第一の実施の形態の電池パックの組み立てを説明する図であり、図２（ａ）は組み立て途中工程の斜視図、図２（ｂ）は組み立て後の斜視図である。ラミネート型リチウム二次電池１から延出された正負極端子２、３と保護回路基板１１がクランプ材２１により嵌合され、図５（ａ）に示すように１回の折り畳みにより、ラミネート型リチウム二次電池１の収納部１６に図５（ｂ）に示すように配置する。   2A and 2B are diagrams for explaining assembly of the battery pack according to the first embodiment of the present invention, in which FIG. 2A is a perspective view of an assembly process, and FIG. 2B is a perspective view after assembly. is there. The positive and negative terminals 2 and 3 extended from the laminate type lithium secondary battery 1 and the protective circuit board 11 are fitted by the clamp material 21, and as shown in FIG. It arrange | positions in the accommodating part 16 of the secondary battery 1 as shown in FIG.5 (b).

図３は、本発明の第二の実施の形態の電池パックの分解斜視図である。ラミネート型リチウム二次電池１と保護回路基板１１は本発明の第一の実施の形態と同様であるがクランプ材４１と絶縁用樹脂板５１を組み合わせた電池パックである。   FIG. 3 is an exploded perspective view of the battery pack according to the second embodiment of the present invention. Laminated lithium secondary battery 1 and protective circuit board 11 are the same as in the first embodiment of the present invention, but are battery packs in which clamp material 41 and insulating resin plate 51 are combined.

クランプ材４１はバネ性と導電性を備えており、また次に説明する絶縁用樹脂板５１を固定する突起４３並びに保護回路基板１１に設けられた切り欠き１５に組み込む固定用フック４２を形成している。絶縁用樹脂板５１には、ラミネート型リチウム二次電池１と保護回路基板１１を固定する突起５２が形成され、裏面にはクランプ材の突起４３が嵌るクランプ用凹部５３が形成されている。また、クランプ材４１には外部接続用リード線３１が半田により接合されている。   The clamp member 41 has spring property and conductivity, and also forms a protrusion 43 for fixing an insulating resin plate 51 to be described below and a fixing hook 42 to be incorporated in the notch 15 provided in the protection circuit board 11. ing. On the insulating resin plate 51, a protrusion 52 for fixing the laminated lithium secondary battery 1 and the protection circuit board 11 is formed, and on the back surface, a clamp recess 53 into which the protrusion 43 of the clamp material is fitted is formed. Further, the external connection lead wire 31 is joined to the clamp member 41 by solder.

ラミネート型リチウム二次電池１の正負極端子２、３及び保護回路基板１１は、各々の取り付け穴４、および穴１４を基準に位置を合わせ、絶縁用樹脂板５１の突起５２により固定され、またクランプ材４１の突起４３により絶縁用樹脂板５１のクランプ用凹部５３が嵌ることにより嵌合接続並びに固定がなされる。また、保護回路基板１１とクランプ材４１は、保護回路基板１１の切り欠き１５とクランプ材４１の固定用フック４２により安定的な固定がなされる。   The positive and negative terminals 2 and 3 and the protection circuit board 11 of the laminated lithium secondary battery 1 are aligned by the respective mounting holes 4 and 14 and fixed by the protrusions 52 of the insulating resin plate 51. By fitting the recess 53 for clamping of the insulating resin plate 51 by the projection 43 of the clamp member 41, the fitting connection and fixing are performed. The protection circuit board 11 and the clamp material 41 are stably fixed by the notch 15 of the protection circuit board 11 and the fixing hook 42 of the clamp material 41.

本発明の電池パックは、部品の軽減と組み立ての簡素化が図られており、コスト低減を図ることができ、また省スペース化も図られていることから小型機器の電池として供給ができかつ、端子の折り畳みを要する電池パックに有効である。   The battery pack of the present invention is reduced in parts and simplified in assembly, can be reduced in cost, and can be supplied as a battery for a small device because space is saved. This is effective for battery packs that require terminal folding.

本発明の第一の実施の形態の電池パックの分解斜視図。The disassembled perspective view of the battery pack of 1st embodiment of this invention. 本発明の第一の実施の形態の電池パックの組み立てを説明する図、図２（ａ）は組み立て途中工程の斜視図、図２（ｂ）は組み立て後の斜視図。The figure explaining the assembly of the battery pack of 1st embodiment of this invention, Fig.2 (a) is a perspective view of an assembly process, FIG.2 (b) is the perspective view after an assembly. 本発明の第二の実施の形態の電池パックの分解斜視図。The disassembled perspective view of the battery pack of 2nd embodiment of this invention. 従来の電池パックの分解斜視図。The exploded perspective view of the conventional battery pack. 従来の電池パックの組み立てを説明する図、図５（ａ）は組み立て途中工程の斜視図、図５（ｂ）は組み立て後の斜視図。The figure explaining the assembly of the conventional battery pack, Fig.5 (a) is a perspective view of the process in the middle of an assembly, FIG.5 (b) is a perspective view after an assembly.

符号の説明Explanation of symbols

１ ラミネート型リチウム二次電池
２ 正極端子
３ 負極端子
４ 取り付け穴
１１ 保護回路基板
１２ 外部接続用正極ランド

１３ 外部接続用負極ランド
１４ 穴
１５ 切り欠き
１６ 収納部
２１ クランプ材
２２ 固定用フック
２３ （絶縁処理された）突起
３１ 外部接続用リード線
４１ クランプ材
４２ 固定用フック
４３ 突起
５１ 絶縁用樹脂板
５２ 突起
５３ クランプ用凹部
１１１ ラミネート型リチウム二次電池
１１２ 正極端子
１１３ 負極端子
１１４ 正極端子片
１１５ 収納部
２１１ 保護回路基板
２１２ 正極接続用ランド
２１３ 負極接続用ランド
３１１ 正極接続用端子
３１２ 負極接続用端子
４１１ 外部接続用リード線
５１１ クッション材 DESCRIPTION OF SYMBOLS 1 Laminate type lithium secondary battery 2 Positive electrode terminal 3 Negative electrode terminal 4 Mounting hole 11 Protective circuit board 12 Positive electrode land for external connection

13 External connection negative electrode land 14 hole
15 Notch 16 Storage part
21 Clamp material
22 Hook for fixing
23 (insulated) protrusion
31 Lead wire for external connection
41 Clamp material
42 Locking hook
43 Protrusions
51 Resin plate for insulation
52 Projection 53 Recess 111 for Clamp Laminated Lithium Secondary Battery
112 Positive terminal
113 Negative terminal 114 Positive terminal piece
115 storage
211 Protection circuit board 212 Land for positive electrode connection
213 Negative connection land
311 Positive connection terminal
312 Terminal for negative electrode connection
411 Lead wire for external connection
511 cushion material

Claims (4)

リチウム二次電池から引き出された平板状の正極端子と負極端子にそれぞれ穴を設け、保護回路基板上の外部接続用正極ランドと外部接続用負極ランドにそれぞれ穴を設け、前記正極端子及び前記負極端子に設けられた穴と、前記外部接続用正極ランド及び前記外部接続用負極ランドに設けられた穴をクランプ材の内側に設けた突起によりそれぞれ位置決めし、前記クランプ材で前記正極端子及び前記負極端子と前記外部接続用正極ランド及び前記外部接続用負極ランドを前記保護回路基板上の保護回路を通してそれぞれ接続固定し、前記クランプ材は導電性を備え、前記正極端子及び前記負極端子と前記クランプ材とは絶縁されていることを特徴とする電池パック。 Each a hole in a plate-like positive electrode terminal drawn from the lithium secondary battery and a negative terminal, respectively provided to the protection circuit external connection positive electrode land and a negative electrode lands for external connection on the substrate hole, the positive terminal and the a hole provided to the negative terminal, the positioning respectively by projections provided with holes provided on the inner side of the clamping member to the external connection positive electrode land and the external connection negative land, said positive terminal in said clamping member And connecting and fixing the negative electrode terminal, the external connection positive electrode land and the external connection negative electrode land through a protection circuit on the protection circuit board, and the clamp member has conductivity, the positive electrode terminal and the negative electrode terminal The battery pack is insulated from the clamp member . 前記保護回路基板に切り欠きを設け、前記クランプ材に設けた固定用フックを前記切り欠きに嵌合し前記保護回路基板を固定したことを特徴とする請求項１記載の電池パック。 The battery pack according to claim 1, wherein the protection circuit board is provided with a notch, and a fixing hook provided on the clamp member is fitted into the notch to fix the protection circuit board. 前記クランプ材の内側に設けた突起が絶縁処理されたことを特徴とする請求項１または２記載の電池パック。   The battery pack according to claim 1, wherein a protrusion provided on the inner side of the clamp member is insulated. 前記正極端子又は前記負極端子とクランプ材との間に絶縁用樹脂板を設けたことを特徴とする請求項１または２記載の電池パック。 The battery pack according to claim 1 , wherein an insulating resin plate is provided between the positive electrode terminal or the negative electrode terminal and the clamp member .
JP2006167371A 2006-06-16 2006-06-16 Battery pack Expired - Fee Related JP5046568B2 (en)

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JP7145624B2 (en) * 2018-03-07 2022-10-03 マクセル株式会社 laminated battery
JP7063661B2 (en) * 2018-03-14 2022-05-09 マクセル株式会社 Laminated battery

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