JP2004071173A - Layer built battery - Google Patents

Layer built battery Download PDF

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Publication number
JP2004071173A
JP2004071173A JP2002224644A JP2002224644A JP2004071173A JP 2004071173 A JP2004071173 A JP 2004071173A JP 2002224644 A JP2002224644 A JP 2002224644A JP 2002224644 A JP2002224644 A JP 2002224644A JP 2004071173 A JP2004071173 A JP 2004071173A
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Prior art keywords
cell
positive electrode
negative electrode
electrode end
connection member
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JP3988570B2 (en
Inventor
Shohei Matsushita
松下 昇平
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Toyota Motor Corp
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Toyota Motor Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a fault in stacking a plurality of cells, wherein adjoining cells are rarely firmly connected to each other and no large current passes therethrough. <P>SOLUTION: This layer built battery 100 comprises a sheet type first cell 70A and a second cell 70B including an electrode body 10, a first positive electrode end part 28 and a second positive electrode end part 33 extending from a positive electrode part 14, a first negative electrode end part 43 and a second negative electrode end part 47 extending from a negative electrode part 18, and a bag-shaped protection film 55 covering over the electrode body 10; and first connecting means 70A and 70B connecting the first positive electrode end part of a first cell to the first negative electrode end part or the first positive electrode end part of a second cell, the second positive electrode end part of the first cell to the second negative electrode end part or the second positive electrode part of the second cell and the like. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、複数の単電池を積層して成る複層型電池に関する。
【0002】
【従来の技術】
携帯機器等で使用される電池において、高い電圧、容量を得るために所定の単電池を積層して直列又は並列に接続し、積層型電池を構成する。積層上の都合を考慮して、単電池はシート形状を持つことが多い。そのために単電池は一般的に正極シート上に正極活物質が形成された正極板と、負極シート上に負極活物質が形成された負極板と、両極板の間に介装されたセパレータとから成る。正極板は正極部を有し、負極板は負極部を有する。複数の単電池を積層する場合、電気的に接続(導通)するとともにある程度の強度で連結することが必要である。
【0003】
例えば、隣接する単電池を連結部材によって直列接続する場合、第1単電池の正極板の正極部と隣接する第2単電池の負極板の負極部とを連結部材により連結し、更に第2単電池の正極部を隣接する第3単電池の負極部に連結部材によって連結する。
【0004】
複数の単電池が積層された積層型電池の一例が特許第2600369号(従来例)に開示されている。この積層型電池では、図17に示すように、薄い矩形状の第1単電池200はその両端に正極部201及び負極部202を持ち、第2単電池205及び第3単電池210もそれぞれ正極部206,211及び負極部207,212を持つ。第1単電池200の正極部201及び負極部202と第2単電池205の負極部207及び正極部206とが対向し、第2単電池205の正極部206及び負極部207と第3単電池210の負極部212及び正極部211とが対向している。
【0005】
第1、第2及び第3単電池200、205及び210は導電性で矩形状を持つ一対の連結部材(プリント配線板)220及び222によって接続及び連結されている。連結部材220及び222の前端付近には3個のスリット221及び223が形成されている。第1、第2及び第3単電池200、205及び210を平行に並べて、連結部材220及び222を側方から連結すると、スリット221に正極部201,負極部207及び正極部211が入り込み、スリット223に負極部202,正極部206及び負極部212が入り込む。これにより、3個の単電池200から210が一対の連結部材220及び222により接続及び連結される。
【0006】
【発明が解決しようとする課題】
上記従来例は、複数の単電池200,205及び210を積層する際の作業工数が小さい点、連結部材220及び222における間接材料の使用量が少ない点、及び積層型電池において正極部201,206及び211と負極部202,207及び212との衝撃による接触が防止される点では好都合である。しかし、以下の点で改良の余地がある。
【0007】
第1に、隣接する単電池200と205、単電池205と210同士が強固に連結されるとは言い難い。その理由は、連結部材220及び222が薄板形状で強度が小さいこと(特に板厚方向(上下方向)に撓み易い)、及び正極部201,206及び211及び負極部202,207及び212と連結部材220及び222とが半田で接合されていることによる。
【0008】
第2に、連結部材220及び222がプリント配線板であるため、余り大きな電流を流すことができず、大型の積層型電池は構築でき難い。第3に、連結部材220及び222の配線が細く抵抗が大きくため、大きな電流を流すとすぐに電圧の上下限に達する。よって、大きな電流を流すことが困難である。
【0009】
本発明は上記事情に鑑みてなされたもので、隣接する単電池が連結手段により強固に連結され且つ大きな電流を流すことができる積層型電池を提供することを目的とする。
【0010】
【課題を解決するための手段】
本願の発明者は、矩形状の電極体にその高さ方向又は幅方向に延びる正極端子及び負極端子を取り付けて単電池を構成し、正極端子及び負極端子を連結部材により連結することにより複数の単電池を積層することを思い付いて本発明を完成した。
【0011】
本発明による積層型電池は、請求項1に記載されているように、第1単電池及び第2単電池であって、それぞれ、正極板と負極板と両極板を隔離するセパレータとから成り正極部及び負極部を有する電極体と、正極部から延びた第1正極端部及び第2正極端部を有する正極端子と、負極部から延びた第1負極端部及び第2負極端部を有する負極端子と、電極体、正極端子及び負極端子の一部を覆う袋状の保護フィルムと、を含むシート状の第1単電池及びシート状の第2単電池と;第1単電池の第1正極端部と第2単電池の第1負極端部又は第1正極端部とを、第1単電池の第2正極端部と第2単電池の第2負極端部又は第2正極端部とを、第1単電池の第1負極端部と第2単電池の第1正極端部又は第1負極端部とを、第1単電池の第2負極端部と第2単電池の第2正極端部又は第2負極端部とを、それぞれ連結する第1連結手段と;から成ることを特徴とする。
【0012】
このように積層型電池では、複数の単電池を正極端子と負極端子、正極端子同士又は負極端子同士を対向させて併置し、対向する端子同士を第1連結手段で連結している。第1連結手段を単電池の上端部及び下端部又は両側部において、単電池の厚さ方向に配置することができる。
【0013】
請求項2の積層型電池は、請求項1において、正極端子はその幅方向の一側縁の高さ方向の中間部が正極部に取り付けられ、電極体の高さ方向に延びた一端部が第1正極端部に他端部が第2正極端部を、負極端子はその幅方向の一側縁の高さ方向の中間部が負極部に取り付けられ、電極体の高さ方向に延びた一端部が第1負極端部を他端部が第2負極端部を、それぞれ構成している。
【0014】
請求項3の積層型電池は、請求項1において、正極端子はその幅方向の一側縁が正極部に取り付けられ、他側縁の一端部が第1正極端部に他端部が第2正極端部を、負極端子はその幅方向の一側縁が負極部に取り付けられ、他側縁の一端部が第1負極端部を他端部が第2負極端部を、それぞれ構成している。
【0015】
請求項4の積層型電池は、請求項1において、第1連結手段は、第1単電池の第1正極端部と第2単電池の第1負極端部との間に介在された第1連結部材と、第1単電池の第2正極端部と第2単電池の第2負極端部との間に介在された第2連結部材と、第1単電池の第1負極端部と第2単電池の第1正極端部との間に介在された第3連結部材と、第1単電池の第2負極端部と第2単電池の第2正極端部との間に介在された第4連結部材と、を含む。
【0016】
請求項5の積層型電池は、請求項4において、第1連結部材及び第2連結部材は非導電性で第3連結部材及び第4連結部材は導電性である。
【0017】
請求項6の積層型電池は、請求項1において、第1連結手段は、第1単電池の第1正極端部と第2単電池の第1正極端部との間に介在された第1連結部材と、第1単電池の第2正極端部と第2単電池の第2正極端部との間に介在された第2連結部材と、第1単電池の第1負極端部と第2単電池の第1負極端部との間に介在された第3連結部材と、第1単電池の第2負極端部と第2単電池の第2負極端部との間に介在された第4連結部材と、を含む。
【0018】
請求項7の積層型電池は、請求項6において、第1連結部材、第2連結部材、第3連結部材及び第4連結部材は導電性である。
【0019】
請求項8の積層型電池は、請求項1において更に、正極板と負極板と両極板を隔離するセパレータとから成り正極部及び負極部を有する電極体と、電極体の正極部から延びた第1正極端部及び第2正極端部を有する正極端子と、電極体の負極部から延びた第1負極端部及び第2負極端部を有する負極端子と、電極体、正極端子及び負極端子の一部を覆う袋状の保護フィルムと、を含む少なくとも1個のシート状の第3単電池を有し;第2単電池の第1正極端部と第3単電池の第1負極端部又は第1正極端部とが、第2単電池の第2正極端部と第3単電池の第2負極端部又は第2正極端部とが、第2単電池の第1負極端部と第3単電池の第1正極端部又は第1負極端部とが、第2単電池の第2負極端部と第3単電池の正極端部又は第2負極端部とが、それぞれ第2連結手段により連結されている。
【0020】
請求項9の積層型電池は、請求項8において、第2連結手段は、第2単電池の第1正極端部と第3単電池の第1負極端部とに介在された第5連結部材と、第2単電池の第2正極端部と第3単電池の第2負極端部との間に介在された第6連結部材と、第2単電池の第1負極端部と第3単電池の第1正極端部との間に介在された第7連結部材と、第2単電池の前記第2負極端部と第3単電池の第2正極端部との間に介在された第8連結部材と、を含む。
【0021】
請求項10の積層型電池は、請求項9において、第5連結部材及び第6連結部材は導電性で、第7連結部材及び第8連結部材は非導電性である。
【0022】
請求項11の積層型電池は、請求項10において、第2電池の第1負極端部及び第2負極端部を間にして、第1連結部材及び第2連結部材の被係合部に第5連結部材及び第6連結部材の係合部が係合し、第2単電池の第1正極端部及び第2正極端部を間にして、第3連結部材及び第4連結部材の係合部が第7連結部材及び第8連結部材の被係合部に係合している。
【0023】
請求項12の積層型電池は、請求項9において、第2連結手段は、第2単電池の第1正極端部と第2単電池の第1正極端部との間に介在された第5連結部材と、第2単電池の第2正極端部と第3単電池の前記正極端部との間に介在された第6連結部材と、第2単電池の第1負極端部と第3単電池の第1負極端部との間に介在された第7連結部材と、第2単電池の第2負極端部と第3単電池の第2負極端部との間に介在された第8連結部材と、を含む。
【0024】
請求項13の積層型電池は、請求項12において、第5連結部材、第6連結部材、第7連結部材及び第8連結部材は導電性である。
【0025】
【発明の実施の形態】
<単電池>
本発明の単電池は電極体、正極端子、負極端子及び保護フィルムから成り、必要に応じて収納ケースを含む。
▲1▼電極体
電極体は正極板、負極板及びセパレータを含む。正極板はアルミニウムから成る正極シートの一部(一端縁から所定幅の範囲)に正極活物質を付与して成り、正極活物質が付与されていない部分が正極部を形成する。負極板は銅から成る負極シートの一部(他端縁から所定幅の範囲)に負極活物質を付与して成り、負極活物質が付与されていない部分が負極部を形成する。正極部と負極部とは幅方向において互いに反対側に位置している。正極活物質の幅と負極活物質の幅とセパレータの幅との間には所定の関係があることが望ましい。
【0026】
単電池は、例えば正極板、第1セパレータ、負極板、第2セパレータを重ねて巻いた後、反物状に押しつぶして製作することができ留。この場合、全体として矩形状で、断面は扁平な長円形状を持つが、これに限定されない。例えば、正極部を持つ矩形状の正極板、絶縁性の矩形状のセパレータ及び負極部を持つ矩形状の負極板から成る板群を複数組み設けることにより形成しても良い。
【0027】
また、電極体はニッケルカドミウム蓄電池、ニッケル水素蓄電池又はリチウムイオン蓄電池の何れでも良い。
▲2▼正極端子
正極端子は導電性材料から成り、2つのタイプがある。第1タイプは全体として棒状で、その高さは電極体の高さよりも相当高い。中間部と、電極体の高さ方向において中間部から両方向(上下方向)に延びる一端部(上端部)及び他端部(下端部)とを持つ。中間部は電極体の正極部の取付けに利用され、一端部及び他端部は単電池の連結(積層)等のために利用される。
【0028】
電極体の幅方向における中間部の寸法は一端部及び他端部のそれよりも小さくでき、電極体の厚さ方向における中間部の寸法は一端部及び他端部のそれよりも大きく(例えば中空の長円形状と)できる。中間部は超音波溶接等により電極体の正極部に取り付けられる。その際、電極体の正極が正極端子を貫通しても良いし、貫通しなくても良い。
【0029】
一端部は中間部側の基端部と先端側の先端部とから成ることができ、基端部は保護シートの接合に利用される。先端部は取付部を備え、具体的には、電極体の幅方向に貫通する貫通孔や、電極体の高さ方向即ち正極端子の長手方向(上下方向)に立設されたピンから成る。
【0030】
なお、他端部は中間部に対して一端部と対称であり、上記基端部及び先端部と同じ構成の基端部及び先端部を持つ。
【0031】
これに対して、第2タイプは全体的に矩形状で、その高さは電極体の高さと同程度である。一側縁(内側縁)において電極体の正極部に取り付けられ、他側縁(外側縁)の一端部が第1正極端部に他端部が第2正極端部になっている。よって、第1正極端部及び第2正極端部は電極体の幅方向に延びている。
▲3▼負極端子
負極端子は導電性で、電極体に対して正極端子と対称な構成を持ち、第1タイプと第2タイプとがある。
▲4▼保護フィルム
袋状の保護フィルムは絶縁性材料から成り矩形状を持つ。正極端子及び負極端子が棒状の場合、保護フィルムは電極体と正極端子及び負極端子の中間部とを覆い、一端部及び他端部は保護フィルムから上下(高さ)方向に突出している。これに対して、正極端子及び負極端子が矩形状の場合、保護フィルムは内側縁を覆い、外側縁は保護フィルムから左右(幅)方向に突出している。
【0032】
保護フィルムで電極体等を覆う際は、2枚の矩形状のフィルム片を電極体の厚さ方向両側に配置し2個の端縁及び2個の側縁を熱溶着等で結合しても良いし、長細い矩形状の1枚のフィルムを中間部で折り曲げて電極体の両側に配置し1個の端縁及び2個の側縁を熱溶着等で結合しても良い。その際、正極端子及び負極端子の一端部及び他端部に対応する部分は熱溶着しない。
尚、保護フィルムは電極体及び電解液の内容物をその内部に密閉し外部から水分等が侵入するのを遮断する、内容物が衝撃等により破損するのを保護する、及び内容物を外部から絶縁する等の役割を持つ。
▲5▼収納ケース
電極体、正極端子及び負極端子を上記保護フィルムで覆うのみでも単電池として機能する。但し、保護フィルムは強度的に充分とは言い難いので、保護フィルムで覆った電極体等を収納ケース内に収納することが望ましい。
【0033】
収納ケースは保護フィルムよりも少し大きい矩形状を持ち、保護フィルムで覆った電極体と、保護フィルムから上下方向又は左右方向に突出した正極端子及び負極端子の一端部及び他端部の一部をその内部に収納する。正極端子及び負極端子の一端部及び他端部の残部は収納ケースから上下方向又は左右方向に突出している。収納ケースは、金属等から成り一方が開口した箱状の一対のケース片を結合して形成することができる。この場合、収納ケースと正極端子及び負極端子とが接触する部分には絶縁材を介在する。尚、収納ケースは、樹脂等の絶縁材料から成り一方が開口した箱状の一対のケース片で構成することもできる。
<積層型電池>
本発明の積層型電池は少なくとも2個の単電池、即ち第1単電池と第2単電池とから成る。
▲1▼第1単電池、第2単電池
単電池の詳細は上述した通りである。第1単電池と第2単電池とは同じ構成(形状、大きさ)及び機能を持つ。第1単電池と第2単電池とを直列に接続する場合は、第1単電池の正極端子と第2単電池の負極端子とを対向させ、第1単電池の負極端子と第2単電池の正極端子とを対向させる。一方、第1単電池と第2単電池とを並列に接続する場合は、第1単電池の正極端子及び負極端子と第2単電池の正極端子及び負極端子とをそれぞれ対向させる。
▲2▼第1連結手段
第1連結手段は、第1単電池と第2単電池とを(より正確には、第1単電池の正極端子及び負極端子と第2単電池の正極端子及び負極端子とを)機械的に連結すると共に、場合によって直列又は並列に接続するものである。上述したように、正極端子は一端部及び他端部を持ち、負極端子は一端部及び他端部を持つので、4個の端部が形成されている。よって、第1連結手段は対向する端部間に介在される第1,第2,第3及び第4連結部材を含み、更に正極端子及び負極端子の一端部及び他端部に形成された取付部を含むことができる。
【0034】
4個の連結部材を導電性とするか非導電性とするかは、複数の単電池を直列に接続するか並列に接続するかにより決まる。例えば、第1単電池と第2単電池とを直列に接続する場合、第1及び第2連結部材を導電性にし、第3及び第4連結部材を非導電性にする。但し、第1及び第2連結部材を非導電性にし、第3及び第4連結部材を導電性にすることもできる。
【0035】
これに対して、第1単電池と第2単電池とを並列に接続する場合は、第1から第4連結部材は全て導電性とする。
【0036】
連結部材の具体的形状は、正極端子及び負極端子の一端部及び他端部の取付部の形状との関係で決まり、棒部材、ピン部材又は板部材とすることができる。
▲3▼第3単電池
積層型電池は1個又は2個以上の第3単電池を含むことができ、第3単電池の個数は得ようとする電圧、容量を考慮して決める。第3単電池は第1単電池及び第2単電池と同じ構成を持つ。第2単電池と第3単電池との連結方法、及び2個以上の第3単電池同士の連結方法は、積層電池全体を直列に接続するか並列に接続するかにより決まる。
▲4▼第2連結手段
第2連結手段は第5連結部材,第6連結部材,第7連結部材及び第8連結部材を含み、それぞれ第1連結手段の第1,第2,第3及び第4連結部材に対向する。第5連結部材と第1連結部材と、第6連結部材と第2連結部材と、第7連結部材と第3連結部材と、第8連結部材と第5連結部材とは、正極端子の一端部又は他端部、又は負極端子の一端部又は他端部を間に挟んで、何れか一方が備える係合部と他方が備える被係合部とにより相互に係合、連結することができる。例えば、第3及び第4連結部材は本体とその両端の一対の第1係合部とを持ち、第1及び第2連結部材は第1係合部が係合可能な第1被係合部を持つ。第5及び第6連結部材は本体とその両端の一対の第2係合部とを持ち、第7及び第8連結部材は第2係合部が係合可能な第2被係合部を持つことができる。
【0037】
また、第1、第2、第3及び第4連結部材、並びに第5、第6、第7及び第8連結部材は、本体とその一端の係合部と、その他端の被係合部とを持つことができる。
【0038】
【実施例】
以下、本発明の実施例を添付図面を参照しつつ説明する。
<第1実施例>
(単電池)
図1、図4(a)、(b)及び(c)に示すように、単電池70は反物状の電極体10と、棒状の正極端子25及び負極端子40と、袋状のラミネートフィルム(保護フィルム)55と、箱状の収納ケース60とから成る。
【0039】
図2及び図3に示すように、電極体10は正極板11の上に第1セパレータ21、負極板15及び第2セパレータ22を順次重ねてこれらを一体的に巻き、反物状に押し付けたものであり、断面が扁平な長円形状を持つ。電極体10は幅W1、高さH1及び厚さT1を持つ。
【0040】
正極板11はアルミニウム箔から成る正極シート12の上に一端縁から一定幅で正極活物質13を形成して成る。負極板15は銅箔から成る負極シート16上に他端縁から一定幅で負極活物質17を形成して成る。負極活物質17の幅w2が正極活物質13の幅w1より広く、第1及び第2セパレータ21及び22の幅w3が負極活物質17の幅w2よりも広い。その結果、電極体10の一端(右端)には正極部14が露出し、他端(左端)には負極部18が露出している。
【0041】
図4(a)から4(c)及び図5に示すように、正極端子25はアルミニウムから成って棒状に長く延び、中間部26と、一端部28及び他端部33とを有する。中間部26の正面形状は上下方向に細長い矩形状でその幅はW2であり、側面形状は扁平な楕円形状でその厚さはT2である。
【0042】
基端部29と先端部31とを含む一端部28の正面形状は上下方向が左右方向よりも少し長い矩形状で、側面形状は上下方向に長い矩形状である。基端部29及び先端部31の幅はW3であり、厚さはT3である。先端部31には取付孔(貫通孔)32が形成されている。
【0043】
尚、他端部33は中間部26に対して一端部28と対象な構成を持つ。即ち、基端部34と先端部36とを有し、幅はW3で厚さはT3である。先端部36には取付孔(貫通孔)37が形成されている。正極端子25の高さH2は電極体10の高さH1より高い。
【0044】
また、負極端子40は銅から成り、電極体10に対して正極端子25と対称な構成を持つ。即ち、中間部41と、一端部43及び他端部47とを含み、一端部43及び他端部47はそれぞれ基端部44及び48と、先端部45及び49とを有する。先端部45及び49は取付孔51及び52を備える。
【0045】
正極端子25及び負極端子40は中間部25及び41においてそれぞれ電極体10の負極部14及び正極部18に取り付けられる。
【0046】
図6に示すように、矩形状の袋状で絶縁性のラミネートフィルム55はここでは2枚のフィルム片を含む。各フィルム片は、アルミニウム箔から成る中間層に、樹脂の接着層から成る内側層とプラスチックから成る外側層を形成して成る。ラミネートフィルム55は電極体10と、正極部14に取り付けられた正極端子40の中間部41と、負極部18に取り付けられた負極端子25の中間部26とを覆っている(図4(a)参照)。
【0047】
ラミネートフィルム55で電極体10等を覆う際は、2枚のフィルム片を電極体10の厚さ方向両側に配置し、加熱して両側縁56a、上端縁56c及び下端縁56dの内側層を溶かし、内側層同士又は内側層と正極端子25及び負極端子40とを接着する。
【0048】
図1に示すように、ラミネートフィルムよりも大きく厚い四角な箱状の収納ケース60は一対のケース片61及び62から成る。各ケース片61及び62は金属から成り、矩形状の基部(底部)と、該底部の各側縁から直角に立ち上がった4個の側壁部とから成り、容器形状を持つ。2個のケース片61及び62を開口側同士を対向させて結合する際、正極端子25の一端部28及び他端部33と、負極端子40の一端部43及び他端部47とが合せ面を通過して上下方向に延びている。収納ケース60と正極端子25の一端部28及び他端部33、並びに負極端子40の一端部43及び他端部47との間は絶縁材により絶縁されている。
【0049】
この単電池70によれば、電極体10の正極部14に正極端子25を、負極部18に負極端子40を取り付け、電極体10等をラミネートフィルム55で覆った後、収納ケース60内に収納している。よって、全体として矩形状のシート状でありながら所定の電力が得られ、しかも構造的に丈夫である。
(積層型電池)
図7に示すように、積層型電池100は、4個の単電池70A、70B、70C及び70Dと、3個の連結手段80A、80B及び80Cとから成る。4個の単電池70Aから70Dは同じ構成を持ち、最も手前の単電池70Aが本発明の第1単電池、2番目の単電池70Bが第2単電池、その他の2個の単電池70C及び70Dが第3単電池にそれぞれ相当する。
【0050】
単電池70Aから70Dの詳細については既述したので、以下、連結手段について詳述する。3個の連結手段80A、80B及び80Cのうち、1番目(最も手前)の連結手段80Aが本発明の第1連結手段に、2番目の連結手段80B及び3番目の連結手段80Cが第2連結手段にそれぞれ相当する。
【0051】
1番目の連結手段80Aは第1単電池70aの正極端子25及び負極端子40と、第2単電池70Bの負極端子40及び正極端子25とを連結する。図7及び図8(a)(b)(c)及び(d)に示すように、連結手段80Aは第1,第2,第3及び第4連結部材71,73,75及び77と、2個のボルト81及び82と、2個のナット84及び85とから成る。
【0052】
図8(a)に示すように、右側の2個の(第1及び第2)連結部材71及び73は非導電性で環形状を持ち、内周面には雌ねじ孔が形成されている。図8(b)に示すように左側の2個の(第3及び第4)連結部材75及び77は、導電性で丸棒状の本体76a及び78aと、その両端の一対の雄ねじ部76b、78b及び76c、78cとを含む。
【0053】
2番目の連結手段80Bは第2単電池70Bの負極端子40及び正極端子25と、第3単電池70Cの正極端子25及び負極端子40とを連結しており、導電性の連結部材87及び非導電性の連結部材85等を含む。3番目の連結手段80Cは第3単電池70Cの正極端子25及び負極端子40と、第4単電池70Dの負極端子40及び正極端子25とを連結しており、導電性の連結部材93及び非導線性の連結部材91等を含む。
【0054】
連結部材75及び77の雄ねじ部が連結部材85等の雌ねじ孔に、連結部材87等の雄ねじ部が連結部材71等の雌ねじ孔、連結部材93等の雄ねじ部が連結部材85等の雌ねじ孔に、それぞれ螺合可能である。図8(c)に示すようにボルト81及び82は先端部31及び36の取付孔32及び37を貫通し、連結部材71及び73の雌ねじ孔に螺合されている。図8(d)に示すように、ナット84及び85は先端部45及び49の取付孔51及び52を貫通した連結部材75及び77の雄ねじ部76b及び78cに螺合されている。
【0055】
尚、図9に示すように、連結部材75の雄ねじ部76cは連結部材85の雌ねじ孔に螺合され、連結部材93の雄ねじ部は連結部材85の雌ねじ孔に螺合されるが、雄ねじ部76c等の先端同士は接触しない。
【0056】
結局、1番目の連結手段80Aは、連結部材71等により単電池70Aの正極端子25の一端部(第1正極端部)28と単電池70Bの負極端子40の一端部(第1負極端部)43とを連結し、連結部材73等により単電池70Aの他端部(第2正極端部)33と単電池70Bの他端部(第2負極端部)47とを連結している。また、連結部材75等により単電池70Aの負極端子40の一端部(第1負極端部)43と単電池70Bの正極端子25の一端部(第1正極端部)28とを電気的に接続及び連結し、連結部材77等により単電池70Aの他端部(第2負極端部)47と単電池70Bの他端部(第2正極端部)33とを電気的に接続及び連結している。これは2番目の連結手段80B及び3番目の連結手段80Cについても基本的に同じである。
【0057】
この積層型電池によれば、4個の単電池70Aから70Dが直列に接続されているので、高い電圧を得ることができる。また、4個単電池70Aから70Dが、3個の連結手段80Aから80Cにより強固に連結されるとともに。必要に応じて電気的に接続又は絶縁される。また、電気的に接続する場合、大きな電流を流すことができ、積層型電池100を大型にすることができる。
<変形例>
▲1▼連結部材の変形例
図10に連結部材の変形例を示す。図10(a)において、導電性の連結部材100は一端に雌ねじ孔(不図示)が形成された本体101と、該本体101の他端から突出した雄ねじ部102とを有する。非導電性の連結部材104も同様に、一端に雌ねじ孔(不図示)が形成された本体105と、該本体105の他端から突出した雄ねじ部106とを有する。正極端子25の一端部28及び他端部33、並びに負極端子40の一端部43及び他端部48を間に挟んで、連結部材100の雄ねじ部102は連結部材104の雌ねじ孔に螺合可能であり、連結部材105の雄ねじ部106は連結部材100の雌ねじ孔に螺合可能である。
【0058】
図10(b)において、導電性の連結部材107は他端に雌ねじ孔108が形成された本体109と、該本体109の一端から突出した雄ねじ部110とを有する。非導電性の連結部材112も同様に、他端に雌ねじ孔113が形成された本体114と、該本体114の一端から突出した雄ねじ部115とを有する。正極端子25の一端部28及び他端部33、並びに負極端子40の一端部43及び他端部48を間に挟んで、連結部材107の雄ねじ部110は連結部材112の雌ねじ孔113に螺合可能であり、連結部材112の雄ねじ部115は連結部材107の雌ねじ孔108に螺合可能である。
▲2▼連結手段の変形例
図11及び図12に連結手段の変形例を示す。図11に示した連結手段では、正極端子の一端部120の上端面に雄ねじ部121が上下方向に立設され、隣接する負極端子の一端部123の上端面にも雄ねじ部124が上下方向に立設されている。一方、導電性又は非導電性で板状の連結部材126の両端に貫通孔127が形成されている。連結時は、連結部材126の貫通孔127に雄ねじ部121および126を貫通させ、ナット(不図示)で締め付ける。
【0059】
図12に示した連結手段では、正極端子の一端部130の先端部に電極体10(図4参照)の幅方向に延びる貫通孔131が形成され、負極端子の一端部133の先端部にも同じ方向に延びる貫通孔134が形成されている。一方、導電性又は非導電性でピン状の連結部材136はその両端に挿入部を備える。連結時は、貫通孔131及び134に連結部材136の両端の挿入部を締め代をもって挿入している。
<第2実施例>
図13に示した第2実施例では、4個の単電池140A、140B、140C及び140Dが連結手段145A、145B及び145Cにより並列に接続されている。即ち、4個の単電池140Aから140Dは同じ構成を持ち、1番目の単電池140Aの正極端子及び負極端子と2番目の単電池140Bの正極端子及び負極端子とが対向している。単電池140Aと単電池140Bとを連結する1番目の連結手段145Aは、第1,第2,第3及び第4連結部材141a、141b、141c及び141dを含み、全ての連結部材141aから141dは導電性で環形状を持つ。
【0060】
2番目の単電池140Bの正極端子及び負極端子と3番目の単電池140Cの正極端子及び負極端子とが対向しており、2番目の連結手段145Bの4個(2個のみ図示)の連結部材142a及び142cは導電性で環形状を持つ。3番目の単電池140Cの正極端子及び負極端子と4番目の単電池140Dの正極端子及び負極端子とが対向しており、3番目の連結手段145Cの4個(2個のみ図示)の連結部材143a及び143cは導電性で環形状を持つ。
【0061】
例えば、各単電池140Aから140Dの負極端子の一端部は、3個の連結部材141a、142a及び143aと、4個の一端部を貫通するボルト(不図示)及びナットとにより結合されている。
【0062】
第2実施例によれば、4個の単電池140Aから140Dが3個の連結手段 145Aから145Cにより強固に連結される。全ての連結部材141aから141d等は同じ構成なので量産可能であり、製造コストが低減できる。また、4個の単電池140Aから140Dが並列に接続されているので、長時間に渡って大きな容量を得ることができる。
<第3実施例>
本発明の積層型電池の第3実施例を図14,図15及び図16に示す。第3実施例は、上記第1実施例と比較して、主に正極端子155及び負極端子160の構成が異なる。
【0063】
即ち、図14に示すように、正極端子155は矩形状を有し、その高さ(上下方向寸法)及びその厚さ(図14の紙面と直角方向の寸法)はそれぞれ電極体150の高さ及び厚さとほぼ等しくされている。正極端子155の内側縁156が電極体150の正極151に取り付けられ、外側縁157は電極体150の幅方向に延びている。負極端子160は、電極体150に対して、正極端子155と対称な構成とされている。
【0064】
図15に示すように、2枚の矩形状のフィルム片から成るラミネートフィルム165が電極体150の厚さ方向両側に配置され、電極体150と、正極端子155の内側縁156と負極端子160の内側縁161とを覆っている。図16に示すように、2個の四角な箱形状のケース片171及び172から成る収納ケース170がラミネートフィルム165の両側に配置され、ラミネートフィルム165、正極端子155の内側縁156及び負極端子160の内側縁161を保護している。その結果、正極端子155の外側縁157及び負極端子160の外側縁162が電極体150の幅方向(左右方向)に突出している。外側縁157は一端部(上端部)158及び他端部(下端部)159を持ち、負極端子160の外側縁162は一端部(上端部)163及び他端部(下端部)164を持っている。
【0065】
尚、上記構成の複数の単電池175は前記図7に示した連結手段80Aから80Cにより(直列に接続する場合)、又は図13に示した連結手段145Aから145Cにより(並列に接続する場合)連結され、積層型電池を構成する。
【0066】
第3実施例によれば、複数の単電池175は左右両側部に形成された連結手段80A等又は145A等により相互に連結される。その結果、積層型電池175の高さを低く抑えることができる。
【0067】
【発明の効果】
以上述べてきたように、発明の積層型電池によれば、全体としてコンパクトで、大きな電流を流すことができ、構造的に強固な積層型電池を得ることができる。
【0068】
請求項2の積層型電池によれば、複数の単電池がその上端側及び下端側に配置された第1連結手段により連結でき、左右方向の寸法を抑えることができる。請求項3の積層型電池によれば、複数の単電池がその両側部に配置された第1連結手段により連結でき、上下方向の寸法を抑えることができる。
【0069】
請求項4及び5の積層型電池によれば第1単電池と第2単電池との直列接続が容易になり、請求項6及び7の積層型電池によれば第1単電池と第2単電池との並列接続が容易になる。
【0070】
請求項8の積層型電池によればより大きな容量又はより高い電圧が得られる。
【0071】
請求項9及び10の積層型電池によれば第2単電池と第3単電池との直列接続が容易になり、請求項11の積層型電池によれば、コンパクトで強固な第1及び第2連結手段が得られる。
【0072】
請求項12及び13の積層型電池によれば、第2単電池と第3単電池との並列接続が容易になる。
【図面の簡単な説明】
【図1】本発明による積層型電池の第1実施例の単電池を示す斜視図である。
【図2】単電池を構成する電極体の斜視図である。
【図3】図2の電極体の要部断面図である。
【図4】(a)は電極体に正極端子及び負極端子を取り付けられた状態を示す正面図、(b)は同じく側面図、(c)は(a)の4−4断面図である。
【図5】単電池の正極端子の正面図である。
【図6】電極体に正極端子、負極端子及び保護フィルムを取り付けた状態を示す正面図である。
【図7】第1実施例の積層型電池を示す斜視図である。
【図8】(a)は非導電性の連結部材を示す斜視図、(b)は導電性の連結部材を示す斜視図、(c)はボルトの斜視図、(d)はナットの斜視図である。
【図9】図7における要部断面図である。
【図10】(a)は連結部材の第1変形例を示す斜視図、(b)は第2変形例を示す斜視図である。
【図11】連結手段の第1変形例を示す斜視図である。
【図12】連結手段の第2変形例を示す斜視図である。
【図13】本発明の積層型電池の第2実施例を示す斜視図である。
【図14】本発明の積層型電池の第3実施例の単電池を示す正面図である。
【図15】電極体に正極端子、負極端子及び保護フィルムを取り付けた状態を示す正面図である。
【図16】第3実施例の積層型電池を示す斜視図である。
【図17】従来の積層型電池の要部を示す斜視図である。
【符号の説明】
10:電極体          11:正極板
14:正極部          15:負極版
18:負極部          21,22:セパレータ
25:正極端子         26:中間部
28:一端部          33:他端部
40:負極端子         41:中間部
43:一端部          47:他端部
70、70A,70B,70C,70D:単電池
71,73,75,77:連結部材
80A,80B,80C:連結手段
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multi-layer battery formed by stacking a plurality of unit cells.
[0002]
[Prior art]
In a battery used in a portable device or the like, a predetermined unit cell is stacked and connected in series or in parallel to obtain a high voltage and a high capacity, thereby forming a stacked battery. In consideration of the convenience of stacking, the unit cell often has a sheet shape. To this end, a unit cell generally includes a positive electrode plate having a positive electrode active material formed on a positive electrode sheet, a negative electrode plate having a negative electrode active material formed on a negative electrode sheet, and a separator interposed between the two electrode plates. The positive electrode plate has a positive electrode part, and the negative electrode plate has a negative electrode part. When a plurality of unit cells are stacked, they need to be electrically connected (conductive) and connected with a certain strength.
[0003]
For example, when adjacent cells are connected in series by a connecting member, the positive electrode portion of the positive electrode plate of the first cell and the negative electrode portion of the negative electrode plate of the adjacent second cell are connected by a connecting member. The positive electrode part of the battery is connected to the negative electrode part of the adjacent third cell by a connecting member.
[0004]
One example of a stacked battery in which a plurality of unit cells are stacked is disclosed in Japanese Patent No. 2600369 (conventional example). In this stacked battery, as shown in FIG. 17, a thin rectangular first unit cell 200 has a positive electrode unit 201 and a negative electrode unit 202 at both ends thereof, and a second unit cell 205 and a third unit cell 210 also have a positive electrode unit, respectively. It has parts 206 and 211 and negative electrodes 207 and 212. The positive electrode part 201 and the negative electrode part 202 of the first cell 200 face the negative electrode part 207 and the positive electrode part 206 of the second cell 205, and the positive electrode part 206 and the negative electrode part 207 of the second cell 205 and the third cell The negative electrode part 212 and the positive electrode part 211 of 210 face each other.
[0005]
The first, second, and third cells 200, 205, and 210 are connected and connected by a pair of conductive and rectangular connection members (printed wiring boards) 220, 222. Three slits 221 and 223 are formed near the front ends of the connecting members 220 and 222. When the first, second and third cells 200, 205 and 210 are arranged in parallel and the connecting members 220 and 222 are connected from the side, the positive electrode part 201, the negative electrode part 207 and the positive electrode part 211 enter the slit 221, The negative electrode part 202, the positive electrode part 206, and the negative electrode part 212 enter the 223. Thus, the three cells 200 to 210 are connected and connected by the pair of connecting members 220 and 222.
[0006]
[Problems to be solved by the invention]
The above-described conventional example is characterized in that the number of work steps for stacking a plurality of unit cells 200, 205, and 210 is small, the amount of indirect material used in the connecting members 220 and 222 is small, and the positive electrodes 201, 206 in the stacked battery. And 211 and the negative electrodes 202, 207 and 212 are prevented from contacting by impact. However, there is room for improvement in the following points.
[0007]
First, it is hard to say that the adjacent cells 200 and 205 and the cells 205 and 210 are firmly connected to each other. The reason is that the connecting members 220 and 222 have a thin plate shape and low strength (especially easy to bend in the plate thickness direction (vertical direction)), and the connecting members are connected to the positive electrodes 201, 206 and 211 and the negative electrodes 202, 207 and 212. 220 and 222 are joined by solder.
[0008]
Second, since the connecting members 220 and 222 are printed wiring boards, a large current cannot flow, and it is difficult to construct a large stacked battery. Third, since the wiring of the connecting members 220 and 222 is thin and has a high resistance, the voltage immediately reaches the upper and lower limits when a large current flows. Therefore, it is difficult to flow a large current.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stacked battery in which adjacent unit cells are firmly connected by a connecting means and can flow a large current.
[0010]
[Means for Solving the Problems]
The inventor of the present application attaches a positive electrode terminal and a negative electrode terminal extending in the height direction or the width direction to a rectangular electrode body to form a unit cell, and connects the positive electrode terminal and the negative electrode terminal with a connecting member to form a plurality of cells. The present invention was completed with the idea of stacking cells.
[0011]
The stacked battery according to the present invention, as described in claim 1, is a first cell and a second cell, each comprising a positive electrode plate, a negative electrode plate, and a separator for separating the bipolar plates. A positive electrode terminal having a first positive electrode end and a second positive electrode end extending from the positive electrode portion, and a first negative electrode end and a second negative electrode end extending from the negative electrode portion. A sheet-shaped first cell and a sheet-shaped second cell including a negative electrode terminal, a bag-shaped protective film covering a part of the electrode body, the positive electrode terminal and the negative electrode terminal; The positive extreme part and the first negative electrode end or the first positive electrode end of the second cell are connected to the second positive electrode end of the first cell and the second negative electrode end or the second positive electrode end of the second cell. And the first negative terminal of the first cell and the first positive terminal or the first negative terminal of the second cell are connected to the second negative terminal of the first cell. Characterized in that it consists of; an end portion and a second positive end or the second negative end of the second cell, a first connecting means for connecting respectively.
[0012]
As described above, in the stacked battery, a plurality of cells are juxtaposed with the positive electrode terminal and the negative electrode terminal and the positive electrode terminals or the negative electrode terminals facing each other, and the facing terminals are connected by the first connecting means. The first connecting means can be arranged in the thickness direction of the cell at the upper end and the lower end or both sides of the cell.
[0013]
In the stacked battery according to the second aspect, in the first aspect, the positive electrode terminal has an intermediate portion in a height direction of one side edge in a width direction thereof attached to the positive electrode portion, and one end portion extending in the height direction of the electrode body is provided. The other end is attached to the first positive electrode end, the second positive electrode end is attached, and the negative electrode terminal is attached to the negative electrode at the intermediate portion in the height direction of one side edge in the width direction, and extends in the height direction of the electrode body. One end constitutes the first negative electrode end and the other end constitutes the second negative electrode end.
[0014]
According to a third aspect of the present invention, in the first aspect, the positive electrode terminal has one side edge in the width direction attached to the positive electrode portion, one end of the other side edge being the first positive electrode end, and the other end being the second end. One end of the positive terminal, one end in the width direction of the negative electrode terminal is attached to the negative electrode part, one end of the other side edge constitutes a first negative electrode end, and the other end constitutes a second negative electrode end. I have.
[0015]
According to a fourth aspect of the present invention, in the first aspect of the present invention, the first connecting means includes a first connecting means interposed between a first positive electrode end of the first unit cell and a first negative electrode end of the second unit cell. A connecting member, a second connecting member interposed between a second positive electrode end of the first cell and a second negative electrode end of the second cell, and a first negative electrode end of the first cell A third connecting member interposed between the first positive electrode end of the two unit cells and a third connecting member interposed between the second negative electrode end of the first unit cell and the second positive electrode end of the second unit cell; A fourth connection member.
[0016]
In the stacked battery according to the fifth aspect, in the fourth aspect, the first connection member and the second connection member are non-conductive, and the third connection member and the fourth connection member are conductive.
[0017]
According to a sixth aspect of the present invention, in the first aspect of the present invention, the first connecting means includes a first connecting means interposed between the first positive electrode end of the first unit cell and the first positive electrode end of the second unit cell. A connecting member, a second connecting member interposed between the second positive electrode end of the first cell and the second positive electrode end of the second cell, and a first negative electrode end of the first cell A third connecting member interposed between the first negative electrode end of the two unit cells and a third connecting member interposed between the second negative electrode end of the first unit cell and the second negative electrode end of the second unit cell A fourth connection member.
[0018]
In the stacked battery according to claim 7, in claim 6, the first connection member, the second connection member, the third connection member, and the fourth connection member are conductive.
[0019]
The stacked battery according to claim 8 further includes an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator separating the two electrode plates, the electrode assembly having a positive electrode portion and a negative electrode portion, and a second electrode extending from the positive electrode portion of the electrode assembly. A positive electrode terminal having a first positive electrode end and a second positive electrode end; a negative electrode terminal having a first negative electrode end and a second negative electrode end extending from a negative electrode portion of the electrode body; And at least one sheet-like third cell including a bag-shaped protective film partially covering the first cell; a first positive electrode end of the second cell and a first negative electrode end of the third cell; or The first positive electrode end is connected to the second positive electrode end of the second cell and the second negative electrode end or the second positive electrode end of the third cell is connected to the first negative electrode end of the second cell. The first positive electrode end or the first negative electrode end of the three cells is the second negative electrode end of the second cell and the positive electrode end or the second negative electrode end of the third cell There are coupled by second coupling means, respectively.
[0020]
According to a ninth aspect of the present invention, in the ninth aspect, the second connecting means is a fifth connecting member interposed between the first positive electrode end of the second cell and the first negative electrode end of the third cell. A sixth connecting member interposed between a second positive electrode end of the second cell and a second negative electrode end of the third cell; a first negative electrode end of the second cell and a third cell. A seventh connecting member interposed between the first positive electrode end of the battery and a seventh connecting member interposed between the second negative electrode end of the second cell and the second positive electrode end of the third cell; 8 connecting members.
[0021]
According to a tenth aspect of the present invention, in the ninth aspect, the fifth connecting member and the sixth connecting member are conductive, and the seventh connecting member and the eighth connecting member are non-conductive.
[0022]
The stacked battery according to claim 11 is the battery according to claim 10, wherein the first negative electrode end portion and the second negative electrode end portion of the second battery are interposed, and the first negative electrode end portion and the second negative electrode end portion are engaged with the engaged portions of the second connection member. The engagement portions of the fifth connection member and the sixth connection member are engaged, and the third connection member and the fourth connection member are engaged with the first positive electrode end and the second positive electrode end of the second unit cell therebetween. The part is engaged with the engaged part of the seventh connecting member and the eighth connecting member.
[0023]
According to a twelfth aspect of the present invention, in the ninth aspect, the second connecting means may include a fifth connecting means interposed between the first positive electrode end of the second cell and the first positive electrode end of the second cell. A connecting member, a sixth connecting member interposed between the second positive electrode end of the second cell and the positive electrode end of the third cell, a first negative electrode end of the second cell and a third A seventh connecting member interposed between the first negative electrode end of the unit cell and a seventh connecting member interposed between the second negative electrode end of the second unit cell and the second negative electrode end of the third unit cell. 8 connecting members.
[0024]
According to a thirteenth aspect of the present invention, in the twelfth aspect, the fifth connection member, the sixth connection member, the seventh connection member, and the eighth connection member are conductive.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
<Single battery>
The unit cell of the present invention includes an electrode body, a positive electrode terminal, a negative electrode terminal, and a protective film, and includes a storage case as necessary.
(1) Electrode body
The electrode body includes a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is formed by applying a positive electrode active material to a part (a range of a predetermined width from one edge) of a positive electrode sheet made of aluminum, and a portion not provided with the positive electrode active material forms a positive electrode portion. The negative electrode plate is formed by applying a negative electrode active material to a part (a range of a predetermined width from the other end edge) of a negative electrode sheet made of copper, and a portion not provided with the negative electrode active material forms a negative electrode portion. The positive electrode part and the negative electrode part are located on opposite sides in the width direction. It is desirable that there is a predetermined relationship between the width of the positive electrode active material, the width of the negative electrode active material, and the width of the separator.
[0026]
A unit cell can be manufactured by, for example, stacking and winding a positive electrode plate, a first separator, a negative electrode plate, and a second separator and then crushing the same into a piece. In this case, the whole has a rectangular shape, and the cross section has a flat oval shape, but is not limited thereto. For example, it may be formed by providing a plurality of plate groups including a rectangular positive electrode plate having a positive electrode portion, an insulating rectangular separator, and a rectangular negative electrode plate having a negative electrode portion.
[0027]
Further, the electrode body may be any one of a nickel cadmium storage battery, a nickel hydride storage battery, and a lithium ion storage battery.
(2) Positive terminal
The positive electrode terminal is made of a conductive material and has two types. The first type is rod-shaped as a whole, and its height is considerably higher than the height of the electrode body. It has an intermediate portion and one end (upper end) and the other end (lower end) extending in both directions (vertical direction) from the intermediate portion in the height direction of the electrode body. The intermediate portion is used for attaching the positive electrode portion of the electrode body, and one end and the other end are used for connection (lamination) of the cells.
[0028]
The dimension of the middle part in the width direction of the electrode body can be smaller than that of the one end and the other end, and the dimension of the middle part in the thickness direction of the electrode body is larger than that of the one end and the other end (for example, hollow). Oval). The intermediate part is attached to the positive electrode part of the electrode body by ultrasonic welding or the like. At this time, the positive electrode of the electrode body may or may not penetrate the positive electrode terminal.
[0029]
One end portion can be composed of a base end portion on the intermediate portion side and a tip end portion on the distal end side, and the base end portion is used for joining the protective sheet. The distal end portion has a mounting portion, and specifically includes a through hole penetrating in the width direction of the electrode body, and a pin standing upright in the height direction of the electrode body, that is, in the longitudinal direction (vertical direction) of the positive electrode terminal.
[0030]
Note that the other end is symmetrical to the one end with respect to the intermediate portion, and has a base end and a tip having the same configuration as the base end and the tip.
[0031]
On the other hand, the second type has a rectangular shape as a whole, and its height is almost the same as the height of the electrode body. One side edge (inner edge) is attached to the positive electrode portion of the electrode body, one end of the other side edge (outer edge) is a first positive electrode end, and the other end is a second positive electrode end. Therefore, the first positive electrode end and the second positive electrode end extend in the width direction of the electrode body.
(3) Negative electrode terminal
The negative electrode terminal is conductive and has a configuration symmetrical to the positive electrode terminal with respect to the electrode body, and there are a first type and a second type.
(4) Protective film
The bag-shaped protective film is made of an insulating material and has a rectangular shape. When the positive electrode terminal and the negative electrode terminal are rod-shaped, the protective film covers the electrode body and an intermediate portion between the positive electrode terminal and the negative electrode terminal, and one end and the other end protrude vertically (height) from the protective film. On the other hand, when the positive electrode terminal and the negative electrode terminal are rectangular, the protective film covers the inner edge, and the outer edge protrudes from the protective film in the left-right (width) direction.
[0032]
When covering the electrode body or the like with the protective film, two rectangular film pieces may be arranged on both sides in the thickness direction of the electrode body, and two edges and two side edges may be joined by heat welding or the like. Alternatively, one long and thin rectangular film may be bent at an intermediate portion and arranged on both sides of the electrode body, and one edge and two side edges may be joined by heat welding or the like. At this time, portions corresponding to one end and the other end of the positive electrode terminal and the negative electrode terminal are not thermally welded.
In addition, the protective film seals the contents of the electrode body and the electrolytic solution inside to prevent moisture and the like from entering from the outside, protects the contents from being damaged by an impact or the like, and protects the contents from the outside. It has the role of insulation.
▲ 5 ▼ Storage case
Even if only the electrode body, the positive electrode terminal and the negative electrode terminal are covered with the above protective film, they function as a unit cell. However, since the strength of the protective film is not sufficient, it is desirable to store the electrode body and the like covered with the protective film in the storage case.
[0033]
The storage case has a rectangular shape slightly larger than the protective film, and the electrode body covered with the protective film, and one end and part of the other end of the positive terminal and the negative terminal protruding vertically or horizontally from the protective film. Store it inside. One end and the remaining end of the other end of the positive terminal and the negative terminal protrude vertically or horizontally from the storage case. The storage case can be formed by connecting a pair of box-shaped case pieces made of metal or the like and having one opening. In this case, an insulating material is interposed at a portion where the storage case contacts the positive electrode terminal and the negative electrode terminal. Note that the storage case may be formed of a pair of box-shaped case pieces made of an insulating material such as resin and having one opening.
<Laminated battery>
The stacked battery of the present invention includes at least two unit cells, that is, a first unit cell and a second unit cell.
(1) First cell and second cell
The details of the unit cell are as described above. The first unit cell and the second unit cell have the same configuration (shape, size) and function. When the first cell and the second cell are connected in series, the positive terminal of the first cell and the negative terminal of the second cell are opposed to each other, and the negative terminal of the first cell and the second cell are connected. To the positive electrode terminal of. On the other hand, when connecting the first cell and the second cell in parallel, the positive terminal and the negative terminal of the first cell and the positive terminal and the negative terminal of the second cell are opposed to each other.
(2) First connection means
The first connecting means mechanically connects the first cell and the second cell (more precisely, the positive terminal and the negative terminal of the first cell and the positive terminal and the negative terminal of the second cell). They are connected and connected in series or in parallel in some cases. As described above, the positive terminal has one end and the other end, and the negative terminal has one end and the other end, so that four ends are formed. Therefore, the first connecting means includes the first, second, third and fourth connecting members interposed between the opposed ends, and furthermore, the mounting formed on one end and the other end of the positive terminal and the negative terminal. Parts can be included.
[0034]
Whether the four connecting members are conductive or non-conductive depends on whether a plurality of unit cells are connected in series or in parallel. For example, when connecting the first unit cell and the second unit cell in series, the first and second connecting members are made conductive, and the third and fourth connecting members are made non-conductive. However, the first and second connecting members may be made non-conductive, and the third and fourth connecting members may be made conductive.
[0035]
On the other hand, when the first cell and the second cell are connected in parallel, all of the first to fourth connecting members are made conductive.
[0036]
The specific shape of the connecting member is determined by the relationship between the shape of the mounting portion at one end and the other end of the positive electrode terminal and the negative electrode terminal, and can be a rod member, a pin member, or a plate member.
(3) Third cell
The stacked battery may include one or more third cells, and the number of the third cells is determined in consideration of the voltage and capacity to be obtained. The third cell has the same configuration as the first cell and the second cell. The method for connecting the second and third cells and the method for connecting two or more third cells are determined by whether the entire stacked battery is connected in series or in parallel.
(4) Second connecting means
The second connection means includes a fifth connection member, a sixth connection member, a seventh connection member, and an eighth connection member, and faces the first, second, third, and fourth connection members of the first connection means, respectively. The fifth connection member and the first connection member, the sixth connection member and the second connection member, the seventh connection member and the third connection member, and the eighth connection member and the fifth connection member are connected to one end of the positive electrode terminal. Alternatively, the other end or the one end or the other end of the negative electrode terminal may be interposed between the engaging portion provided on one side and the engaged portion provided on the other side. For example, the third and fourth connecting members have a main body and a pair of first engaging portions at both ends thereof, and the first and second connecting members are first engaged portions to which the first engaging portions can engage. have. The fifth and sixth connecting members have a main body and a pair of second engaging portions at both ends thereof, and the seventh and eighth connecting members have a second engaged portion to which the second engaging portion can engage. be able to.
[0037]
Further, the first, second, third, and fourth connecting members, and the fifth, sixth, seventh, and eighth connecting members are configured such that the main body and the engaging portion at one end of the main body and the engaged portion at the other end are connected to each other. Can have.
[0038]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<First embodiment>
(Cell)
As shown in FIGS. 1, 4 (a), (b) and (c), the cell 70 has a piece-shaped electrode body 10, a bar-shaped positive electrode terminal 25 and a negative electrode terminal 40, and a bag-shaped laminated film ( (Protective film) 55 and a box-shaped storage case 60.
[0039]
As shown in FIGS. 2 and 3, the electrode body 10 is obtained by sequentially stacking a first separator 21, a negative electrode plate 15, and a second separator 22 on a positive electrode plate 11, winding them integrally, and pressing the same into a cloth. And the cross section has a flat elliptical shape. The electrode body 10 has a width W1, a height H1, and a thickness T1.
[0040]
The positive electrode plate 11 is formed by forming a positive electrode active material 13 with a constant width from one edge on a positive electrode sheet 12 made of aluminum foil. The negative electrode plate 15 is formed by forming a negative electrode active material 17 on a negative electrode sheet 16 made of copper foil with a constant width from the other end. The width w2 of the negative electrode active material 17 is wider than the width w1 of the positive electrode active material 13, and the width w3 of the first and second separators 21 and 22 is wider than the width w2 of the negative electrode active material 17. As a result, the positive electrode portion 14 is exposed at one end (right end) of the electrode body 10, and the negative electrode portion 18 is exposed at the other end (left end).
[0041]
As shown in FIGS. 4 (a) to 4 (c) and FIG. 5, the positive electrode terminal 25 is made of aluminum and extends in a rod shape, and has an intermediate portion 26, one end portion 28 and the other end portion 33. The front shape of the intermediate portion 26 is a rectangular shape elongated in the up-down direction, the width is W2, the side shape is a flat elliptical shape, and the thickness is T2.
[0042]
The front shape of the one end portion 28 including the base end portion 29 and the distal end portion 31 is a rectangular shape in which the vertical direction is slightly longer than the horizontal direction, and the side shape is a rectangular shape which is long in the vertical direction. The width of the proximal end portion 29 and the distal end portion 31 is W3, and the thickness is T3. A mounting hole (through hole) 32 is formed in the distal end portion 31.
[0043]
The other end 33 has a configuration symmetrical to the one end 28 with respect to the intermediate part 26. That is, it has a base end portion 34 and a front end portion 36, and has a width W3 and a thickness T3. A mounting hole (through hole) 37 is formed in the distal end portion 36. The height H2 of the positive electrode terminal 25 is higher than the height H1 of the electrode body 10.
[0044]
The negative electrode terminal 40 is made of copper and has a configuration symmetrical to the positive electrode terminal 25 with respect to the electrode body 10. That is, it includes the intermediate portion 41, one end 43 and the other end 47, and the one end 43 and the other end 47 have base ends 44 and 48 and front ends 45 and 49, respectively. The tip portions 45 and 49 have mounting holes 51 and 52.
[0045]
The positive electrode terminal 25 and the negative electrode terminal 40 are attached to the negative electrode portion 14 and the positive electrode portion 18 of the electrode body 10 at the intermediate portions 25 and 41, respectively.
[0046]
As shown in FIG. 6, a rectangular bag-shaped insulating laminate film 55 includes two pieces of film here. Each film strip is formed by forming an inner layer made of a resin adhesive layer and an outer layer made of plastic on an intermediate layer made of aluminum foil. The laminate film 55 covers the electrode body 10, the intermediate portion 41 of the positive electrode terminal 40 attached to the positive electrode portion 14, and the intermediate portion 26 of the negative electrode terminal 25 attached to the negative electrode portion 18 (FIG. 4A). reference).
[0047]
When covering the electrode body 10 and the like with the laminate film 55, two film pieces are arranged on both sides in the thickness direction of the electrode body 10 and heated to melt the inner layers of the side edges 56a, the upper edge 56c, and the lower edge 56d. Then, the positive electrode terminal 25 and the negative electrode terminal 40 are bonded to each other or to the inner layers.
[0048]
As shown in FIG. 1, a rectangular box-shaped storage case 60 that is larger and thicker than the laminate film is composed of a pair of case pieces 61 and 62. Each of the case pieces 61 and 62 is made of metal, has a rectangular base (bottom), and four side walls rising perpendicularly from each side edge of the bottom, and has a container shape. When the two case pieces 61 and 62 are joined with their opening sides facing each other, the one end 28 and the other end 33 of the positive terminal 25 and the one end 43 and the other end 47 of the negative terminal 40 are mated. And extends vertically. The storage case 60 and the one end 28 and the other end 33 of the positive terminal 25 and the one end 43 and the other end 47 of the negative terminal 40 are insulated by an insulating material.
[0049]
According to this single cell 70, the positive electrode terminal 25 is attached to the positive electrode part 14 of the electrode body 10, the negative electrode terminal 40 is attached to the negative electrode part 18, and the electrode body 10 and the like are covered with the laminate film 55 and then housed in the housing case 60. are doing. Therefore, a predetermined electric power can be obtained while being a rectangular sheet as a whole, and it is structurally strong.
(Laminated battery)
As shown in FIG. 7, the stacked battery 100 includes four unit cells 70A, 70B, 70C, and 70D and three connecting units 80A, 80B, and 80C. The four cells 70A to 70D have the same configuration, with the foremost cell 70A being the first cell of the present invention, the second cell 70B being the second cell, the other two cells 70C, 70D corresponds to the third cell, respectively.
[0050]
Since the details of the cells 70A to 70D have been described above, the connecting means will be described in detail below. Of the three connecting means 80A, 80B, and 80C, the first (foremost) connecting means 80A is the first connecting means of the present invention, and the second connecting means 80B and the third connecting means 80C are the second connecting means. Means.
[0051]
The first connecting means 80A connects the positive terminal 25 and the negative terminal 40 of the first cell 70a to the negative terminal 40 and the positive terminal 25 of the second cell 70B. As shown in FIGS. 7 and 8 (a), (b), (c) and (d), the connecting means 80A comprises first, second, third and fourth connecting members 71, 73, 75 and 77, It consists of two bolts 81 and 82 and two nuts 84 and 85.
[0052]
As shown in FIG. 8A, the two (first and second) connecting members 71 and 73 on the right side are nonconductive and have a ring shape, and a female screw hole is formed on the inner peripheral surface. As shown in FIG. 8B, the two (third and fourth) connecting members 75 and 77 on the left side are made of conductive round bar-shaped main bodies 76a and 78a, and a pair of male screw portions 76b and 78b at both ends thereof. And 76c, 78c.
[0053]
The second connecting means 80B connects the negative electrode terminal 40 and the positive electrode terminal 25 of the second cell 70B to the positive electrode terminal 25 and the negative electrode terminal 40 of the third cell 70C. It includes a conductive connecting member 85 and the like. The third connecting means 80C connects the positive terminal 25 and the negative terminal 40 of the third cell 70C to the negative terminal 40 and the positive terminal 25 of the fourth cell 70D, and the conductive connecting member 93 and the non-conductive It includes a conductive connecting member 91 and the like.
[0054]
The male screw portions of the connecting members 75 and 77 are provided in female screw holes such as the connecting member 85, the male screw portions such as the connecting member 87 are provided in female screw holes of the connecting member 71, and the male screw portions such as the connecting member 93 are provided in the female screw holes of the connecting member 85. Can be screwed together. As shown in FIG. 8C, the bolts 81 and 82 pass through the mounting holes 32 and 37 of the distal ends 31 and 36, and are screwed into female screw holes of the connecting members 71 and 73. As shown in FIG. 8D, the nuts 84 and 85 are screwed into the male screw portions 76b and 78c of the connecting members 75 and 77 that pass through the mounting holes 51 and 52 of the tip portions 45 and 49.
[0055]
As shown in FIG. 9, the male screw portion 76c of the connecting member 75 is screwed into the female screw hole of the connecting member 85, and the male screw portion of the connecting member 93 is screwed into the female screw hole of the connecting member 85. The tips such as 76c do not contact each other.
[0056]
After all, the first connecting means 80A is connected to one end (first positive end) 28 of the positive terminal 25 of the unit cell 70A and one end (first negative end) of the negative terminal 40 of the unit 70B by the connecting member 71 or the like. ) 43, and the other end (second positive electrode end) 33 of the cell 70A and the other end (second negative electrode end) 47 of the cell 70B are connected by a connecting member 73 or the like. Further, one end (first negative end) 43 of the negative electrode terminal 40 of the unit cell 70A and one end (first positive end) 28 of the positive terminal 25 of the unit cell 70B are electrically connected by the connecting member 75 or the like. The other end (second negative electrode end) 47 of the cell 70A and the other end (second positive electrode end) 33 of the cell 70B are electrically connected and connected by the connecting member 77 and the like. I have. This is basically the same for the second connecting means 80B and the third connecting means 80C.
[0057]
According to this stacked battery, a high voltage can be obtained because the four unit cells 70A to 70D are connected in series. Further, the four unit cells 70A to 70D are firmly connected by the three connecting means 80A to 80C. It is electrically connected or insulated as needed. In the case of electrical connection, a large current can flow, and the size of the stacked battery 100 can be increased.
<Modification>
(1) Modification of connecting member
FIG. 10 shows a modification of the connecting member. In FIG. 10A, a conductive connecting member 100 has a main body 101 having a female screw hole (not shown) at one end, and a male screw portion 102 protruding from the other end of the main body 101. Similarly, the non-conductive connecting member 104 includes a main body 105 having a female screw hole (not shown) at one end, and a male screw portion 106 protruding from the other end of the main body 105. With the one end 28 and the other end 33 of the positive terminal 25 and the one end 43 and the other end 48 of the negative terminal 40 interposed therebetween, the male screw portion 102 of the connecting member 100 can be screwed into the female screw hole of the connecting member 104. The male screw portion 106 of the connecting member 105 can be screwed into the female screw hole of the connecting member 100.
[0058]
In FIG. 10B, the conductive connecting member 107 has a main body 109 having a female screw hole 108 formed at the other end, and a male screw portion 110 protruding from one end of the main body 109. Similarly, the non-conductive connecting member 112 also has a main body 114 having a female screw hole 113 formed at the other end, and a male screw portion 115 protruding from one end of the main body 114. With the one end 28 and the other end 33 of the positive terminal 25 and the one end 43 and the other end 48 of the negative terminal 40 interposed therebetween, the male screw 110 of the connecting member 107 is screwed into the female screw hole 113 of the connecting member 112. The male screw portion 115 of the connecting member 112 can be screwed into the female screw hole 108 of the connecting member 107.
(2) Modified example of connecting means
11 and 12 show modified examples of the connecting means. In the connecting means shown in FIG. 11, a male screw portion 121 is vertically provided on the upper end surface of one end portion 120 of the positive electrode terminal, and a male screw portion 124 is also provided vertically on the upper end surface of one end portion 123 of the adjacent negative electrode terminal. It is erected. On the other hand, through holes 127 are formed at both ends of a conductive or non-conductive plate-like connecting member 126. At the time of connection, the male screw portions 121 and 126 are passed through the through holes 127 of the connection member 126 and fastened with nuts (not shown).
[0059]
In the connecting means shown in FIG. 12, a through-hole 131 extending in the width direction of the electrode body 10 (see FIG. 4) is formed at the tip of one end 130 of the positive electrode terminal, and the tip of one end 133 of the negative electrode terminal is also formed at the tip. A through hole 134 extending in the same direction is formed. On the other hand, the conductive or non-conductive pin-shaped connecting member 136 has insertion portions at both ends. At the time of connection, the insertion portions at both ends of the connection member 136 are inserted into the through holes 131 and 134 with interference.
<Second embodiment>
In the second embodiment shown in FIG. 13, four unit cells 140A, 140B, 140C and 140D are connected in parallel by connecting means 145A, 145B and 145C. That is, the four unit cells 140A to 140D have the same configuration, and the positive terminal and the negative terminal of the first unit cell 140A face the positive terminal and the negative terminal of the second unit cell 140B. The first connecting means 145A for connecting the unit cell 140A and the unit cell 140B includes first, second, third and fourth connecting members 141a, 141b, 141c and 141d, and all connecting members 141a to 141d are It is conductive and has a ring shape.
[0060]
The positive electrode terminal and the negative electrode terminal of the second cell 140B and the positive electrode terminal and the negative electrode terminal of the third cell 140C are opposed to each other, and four (two only) connecting members of the second connecting means 145B are provided. 142a and 142c are conductive and have a ring shape. The positive terminal and the negative terminal of the third cell 140C and the positive terminal and the negative terminal of the fourth cell 140D face each other, and four (only two) connecting members of the third connecting means 145C are provided. 143a and 143c are conductive and have a ring shape.
[0061]
For example, one end of the negative electrode terminal of each of the unit cells 140A to 140D is connected to three connecting members 141a, 142a and 143a, and bolts (not shown) and nuts penetrating the four ends.
[0062]
According to the second embodiment, four unit cells 140A to 140D are firmly connected by three connecting means 145A to 145C. Since all the connecting members 141a to 141d have the same configuration, they can be mass-produced and the manufacturing cost can be reduced. Further, since the four unit cells 140A to 140D are connected in parallel, a large capacity can be obtained for a long time.
<Third embodiment>
A third embodiment of the stacked battery according to the present invention is shown in FIGS. The third embodiment differs from the first embodiment mainly in the configuration of the positive terminal 155 and the negative terminal 160.
[0063]
That is, as shown in FIG. 14, the positive electrode terminal 155 has a rectangular shape, and its height (vertical dimension) and its thickness (dimension in the direction perpendicular to the paper surface of FIG. 14) are each equal to the height of the electrode body 150. And approximately the same thickness. The inner edge 156 of the positive electrode terminal 155 is attached to the positive electrode 151 of the electrode body 150, and the outer edge 157 extends in the width direction of the electrode body 150. The negative electrode terminal 160 has a configuration symmetrical to the positive electrode terminal 155 with respect to the electrode body 150.
[0064]
As shown in FIG. 15, a laminate film 165 composed of two rectangular film pieces is disposed on both sides in the thickness direction of the electrode body 150, and the electrode body 150, the inner edge 156 of the positive electrode terminal 155, and the negative electrode terminal 160 are formed. The inner edge 161 is covered. As shown in FIG. 16, storage cases 170 each including two rectangular box-shaped case pieces 171 and 172 are disposed on both sides of the laminate film 165, and the laminate film 165, the inner edge 156 of the positive terminal 155, and the negative terminal 160 are provided. The inner edge 161 is protected. As a result, the outer edge 157 of the positive terminal 155 and the outer edge 162 of the negative terminal 160 protrude in the width direction (left-right direction) of the electrode body 150. The outer edge 157 has one end (upper end) 158 and the other end (lower end) 159, and the outer edge 162 of the negative electrode terminal 160 has one end (upper end) 163 and the other end (lower end) 164. I have.
[0065]
The plurality of cells 175 having the above configuration are connected by the connecting means 80A to 80C shown in FIG. 7 (when connected in series) or by the connecting means 145A to 145C shown in FIG. 13 (when connected in parallel). They are connected to form a stacked battery.
[0066]
According to the third embodiment, the plurality of cells 175 are connected to each other by connecting means 80A or the like or 145A or the like formed on both left and right sides. As a result, the height of the stacked battery 175 can be reduced.
[0067]
【The invention's effect】
As described above, according to the stacked battery of the invention, it is possible to obtain a stacked battery that is compact as a whole, can flow a large current, and is structurally strong.
[0068]
According to the stacked battery of the second aspect, the plurality of cells can be connected by the first connection means disposed on the upper end side and the lower end side, and the size in the left-right direction can be suppressed. According to the stacked battery of the third aspect, the plurality of cells can be connected by the first connecting means arranged on both sides thereof, and the size in the vertical direction can be suppressed.
[0069]
According to the stacked batteries of claims 4 and 5, it is easy to connect the first cell and the second cell in series. According to the stacked batteries of claims 6 and 7, the first cell and the second cell are connected. Parallel connection with batteries is facilitated.
[0070]
According to the stacked battery of the eighth aspect, a larger capacity or a higher voltage can be obtained.
[0071]
According to the stacked batteries of the ninth and tenth aspects, it is easy to connect the second cell and the third cell in series, and according to the stacked battery of the eleventh aspect, the first and the second batteries are compact and strong. A connecting means is obtained.
[0072]
According to the stacked batteries of the twelfth and thirteenth aspects, the parallel connection of the second cell and the third cell is facilitated.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a unit cell of a first embodiment of a stacked battery according to the present invention.
FIG. 2 is a perspective view of an electrode body constituting a unit cell.
FIG. 3 is a sectional view of a main part of the electrode body of FIG. 2;
4A is a front view showing a state in which a positive electrode terminal and a negative electrode terminal are attached to an electrode body, FIG. 4B is a side view thereof, and FIG. 4C is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a front view of a positive electrode terminal of the unit cell.
FIG. 6 is a front view showing a state where a positive electrode terminal, a negative electrode terminal, and a protective film are attached to an electrode body.
FIG. 7 is a perspective view showing the stacked battery of the first embodiment.
8A is a perspective view showing a non-conductive connecting member, FIG. 8B is a perspective view showing a conductive connecting member, FIG. 8C is a perspective view of a bolt, and FIG. It is.
FIG. 9 is a sectional view of a main part in FIG. 7;
10A is a perspective view showing a first modification of the connecting member, and FIG. 10B is a perspective view showing a second modification.
FIG. 11 is a perspective view showing a first modification of the connecting means.
FIG. 12 is a perspective view showing a second modification of the connecting means.
FIG. 13 is a perspective view showing a second embodiment of the stacked battery of the present invention.
FIG. 14 is a front view showing a unit cell of a third embodiment of the stacked battery of the present invention.
FIG. 15 is a front view showing a state where a positive electrode terminal, a negative electrode terminal, and a protective film are attached to an electrode body.
FIG. 16 is a perspective view showing a stacked battery of a third embodiment.
FIG. 17 is a perspective view showing a main part of a conventional stacked battery.
[Explanation of symbols]
10: Electrode body 11: Positive electrode plate
14: Positive electrode part 15: Negative electrode plate
18: negative electrode part 21, 22: separator
25: Positive terminal 26: Middle part
28: One end 33: The other end
40: negative electrode terminal 41: middle part
43: One end 47: The other end
70, 70A, 70B, 70C, 70D: single cell
71, 73, 75, 77: connecting member
80A, 80B, 80C: connecting means

Claims (13)

第1単電池及び第2単電池であって、それぞれ、正極板と負極板と両極板を隔離するセパレータとから成り正極部及び負極部を有する電極体と、該正極部から延びた第1正極端部及び第2正極端部を有する正極端子と、該負極部から延びた第1負極端部及び第2負極端部を有する負極端子と、該電極体と該正極端子及び該負極端子の一部とを覆う袋状の保護フィルムと、を含むシート状の第1単電池及び第2単電池と、
該第1単電池の該第1正極端部と該第2単電池の該第1負極端部又は第1正極端部とを、該第1単電池の該第2正極端部と該第2単電池の該第2負極端部又は第2正極端部とを、該第1単電池の該第1負極端部と該第2単電池の該第1正極端部又は第1負極端部とを、該第1単電池の該第2負極端部と該第2単電池の該第2正極端部又は第2負極端部とを、それぞれ連結する第1連結手段と、
から成ることを特徴とする積層型電池。
An electrode assembly comprising a positive electrode plate, a negative electrode plate, and a separator for separating the two electrode plates, the first cell and the second cell each having a positive electrode portion and a negative electrode portion, and a first positive electrode extending from the positive electrode portion. A positive electrode terminal having an extreme portion and a second positive electrode end, a negative electrode terminal having a first negative electrode end and a second negative electrode end extending from the negative electrode portion, and one of the electrode body, the positive electrode terminal, and the negative electrode terminal; A sheet-shaped first cell and a second cell including a bag-shaped protective film that covers
The first positive electrode end of the first cell and the first negative electrode end or the first positive electrode end of the second cell are connected to the second positive electrode end of the first cell and the second positive electrode end. The second negative electrode end or the second positive electrode end of the unit cell is connected to the first negative electrode end of the first unit cell and the first positive electrode end or the first negative end of the second unit cell. A first connecting means for connecting the second negative electrode end of the first cell and the second positive electrode end or the second negative electrode end of the second cell, respectively;
A stacked type battery comprising:
前記正極端子はその幅方向の一側縁の高さ方向の中間部が前記正極部に取り付けられ、前記電極体の高さ方向に延びた一端部が前記第1正極端部に他端部が前記第2正極端部を、前記負極端子はその幅方向の一側縁の高さ方向の中間部が前記負極部に取り付けられ、前記電極体の高さ方向に延びた一端部が前記第1負極端部を他端部が前記第2負極端部を、それぞれ構成している請求項1に記載の積層型電池。The positive electrode terminal has an intermediate portion in the height direction of one side edge in the width direction attached to the positive electrode portion, and one end extending in the height direction of the electrode body has the other end connected to the first positive electrode end. The second positive electrode end, the negative electrode terminal is attached to the negative electrode part at an intermediate portion in the height direction of one side edge in the width direction, and the one end extending in the height direction of the electrode body is the first electrode. 2. The stacked battery according to claim 1, wherein the other end of the negative electrode constitutes the second negative electrode end. 前記正極端子はその幅方向の一側縁が前記正極部に取り付けられ、他側縁の一端部が前記第1正極端部に他端部が前記第2正極端部を、前記負極端子はその幅方向の一側縁が前記負極部に取り付けられ、他側縁の一端部が前記第1負極端部を他端部が前記第2負極端部を、それぞれ構成している請求項1に記載の積層型電池。One end of the positive electrode terminal in the width direction is attached to the positive electrode portion, one end of the other side edge is the first positive electrode end, the other end is the second positive electrode end, and the negative electrode terminal is The one side edge in the width direction is attached to the negative electrode portion, and one end of the other side edge forms the first negative electrode end and the other end forms the second negative electrode end, respectively. Stacked battery. 前記第1連結手段は、前記第1単電池の第1正極端部と前記第2単電池の第1負極端部との間に介在された第1連結部材と、前記第1単電池の第2正極端部と前記第2単電池の第2負極端部との間に介在された第2連結部材と、前記第1単電池の第1負極端部と前記第2単電池の第1正極端部との間に介在された第3連結部材と、前記第1単電池の前記第2負極端部と前記第2単電池の第2正極端部との間に介在された第4連結部材と、を含む請求項1に記載の積層型電池。The first connection means includes a first connection member interposed between a first positive electrode end of the first cell and a first negative electrode end of the second cell, and a first connection member of the first cell. (2) a second connecting member interposed between a positive electrode end and a second negative electrode end of the second cell; a first negative electrode end of the first cell and a first positive electrode of the second cell; A third connecting member interposed between the extreme unit and a fourth connecting member interposed between the second negative electrode end of the first cell and the second positive electrode end of the second cell; The stacked battery according to claim 1, comprising: 前記第1連結部材及び前記第2連結部材は非導電性で、前記第3連結部材及び前記第4連結部材は導電性である請求項4に記載の積層型電池。The stacked battery according to claim 4, wherein the first connection member and the second connection member are non-conductive, and the third connection member and the fourth connection member are conductive. 前記第1連結手段は、前記第1単電池の第1正極端部と前記第2単電池の第1正極端部との間に介在された第1連結部材と、該第1単電池の第2正極端部と該第2単電池の第2正極端部との間に介在された第2連結部材と、該第1単電池の第1負極端部と該第2単電池の第1負極端部との間に介在された第3連結部材と、該第1単電池の第2負極端部と該第2単電池の第2負極端部との間に介在された第4連結部材と、を含む請求項1に記載の積層型電池。The first connection means includes a first connection member interposed between a first positive electrode end of the first cell and a first positive electrode end of the second cell, and a first connection member of the first cell. A second connecting member interposed between the second positive electrode end and the second positive electrode end of the second cell; a first negative electrode end of the first cell and a first negative electrode of the second cell; A third connecting member interposed between the extreme portion and a fourth connecting member interposed between the second negative electrode end of the first cell and the second negative electrode end of the second cell; The stacked battery according to claim 1, comprising: 前記第1連結部材、前記第2連結部材、前記第3連結部材及び前記第4連結部材は導電性である請求項6に記載の積層型電池。The stacked battery according to claim 6, wherein the first connection member, the second connection member, the third connection member, and the fourth connection member are conductive. 更に、正極板と負極板と両極板を隔離するセパレータとから成り正極部及び負極部を有する電極体と、該正極部から延びた第1正極端部及び第2正極端部を有する正極端子と、該電極体の該負極部から延びた第1負極端部及び第2負極端部を有する負極端子と、該電極体と該正極端子及び該負極端子の一部とを覆う袋状の保護フィルムと、を含む少なくとも1個のシート状の第3単電池を有し、
該第2単電池の該第1正極端部と該第3単電池の該第1負極端部又は該第1正極端部とが、該第2単電池の該第2正極端部と該第3単電池の該第2負極端部又は該第2正極端部とが、該第2単電池の該第1負極端部と該第3単電池の該第1正極端部又は該第1負極端部とが、該第2単電池の該第2負極端部と該第3単電池の該正極端部又は該第2負極端部とが、それぞれ第2連結手段により連結されている請求項1に記載の積層型電池。
Further, an electrode body comprising a positive electrode plate, a negative electrode plate, and a separator separating the two electrode plates and having a positive electrode portion and a negative electrode portion, and a positive electrode terminal having a first positive electrode end and a second positive electrode end extending from the positive electrode portion, A negative electrode terminal having a first negative electrode end and a second negative electrode end extending from the negative electrode part of the electrode body; and a bag-shaped protective film covering the electrode body, the positive electrode terminal, and a part of the negative electrode terminal. And at least one sheet-like third cell including:
The first positive electrode end of the second cell and the first negative electrode end or the first positive electrode end of the third cell are connected to the second positive electrode end of the second cell and the second positive electrode end of the second cell. The second negative electrode end or the second positive electrode end of the three unit cells is connected to the first negative electrode end of the second unit cell and the first positive electrode end or the first negative end of the third unit cell. The extreme part, wherein the second negative electrode end of the second cell and the positive electrode end or the second negative electrode end of the third cell are connected by second connection means, respectively. 2. The stacked battery according to 1.
前記第2連結手段は、前記第2単電池の第1正極端部と前記第3単電池の第1負極端部とに介在された第5連結部材と、該第2単電池の第2正極端部と該第3単電池の第2負極端部との間に介在された第6連結部材と、該第2単電池の第1負極端部と該第3単電池の第1正極端部との間に介在された第7連結部材と、該第2単電池の前記第2負極端部と該第3単電池の第2正極端部との間に介在された第8連結部材と、を含む請求項8に記載の積層型電池。The second connecting means includes a fifth connecting member interposed between a first positive electrode end of the second cell and a first negative electrode end of the third cell, and a second positive electrode of the second cell. A sixth connecting member interposed between the extreme portion and the second negative electrode end of the third cell, a first negative electrode end of the second cell and a first positive electrode end of the third cell; A seventh connection member interposed between the second cell and an eighth connection member interposed between the second negative electrode end of the second cell and the second positive electrode end of the third cell; The stacked battery according to claim 8, comprising: 前記第5連結部材及び前記第6連結部材は導電性で、前記第7連結部材及び前記第8連結部材は非導電性である請求項9に記載の積層型電池。The stacked battery according to claim 9, wherein the fifth connecting member and the sixth connecting member are conductive, and the seventh connecting member and the eighth connecting member are non-conductive. 前記第2電池の前記第1負極端部及び前記第2負極端部を間にして、前記第1連結部材及び前記第2連結部材の被係合部に前記第5連結部材及び前記第6連結部材の係合部が係合し、前記第2単電池の前記第1正極端部及び前記第2正極端部を間にして、前記第3連結部材及び前記第4連結部材の係合部が前記第7連結部材及び前記第8連結部材の被係合部に係合している請求項10に記載の積層型電池。The fifth connection member and the sixth connection are engaged with the engaged portions of the first connection member and the second connection member with the first negative electrode end portion and the second negative electrode end portion of the second battery therebetween. The engaging portions of the members are engaged, and the engaging portions of the third connecting member and the fourth connecting member are located between the first positive electrode end and the second positive electrode end of the second cell. The stacked battery according to claim 10, wherein the stacked battery is engaged with the engaged portions of the seventh connection member and the eighth connection member. 前記第2連結手段は、前記第2単電池の第1正極端部と前記第2単電池の第1正極端部との間に介在された第5連結部材と、前記第2単電池の第2正極端部と前記第3単電池の前記正極端部との間に介在された第6連結部材と、前記第2単電池の第1負極端部と前記第3単電池の第1負極端部との間に介在された第7連結部材と、前記第2単電池の前記第2負極端部と前記第3単電池の第2負極端部との間に介在された第8連結部材と、を含む請求項8に記載の積層型電池。The second connection means includes a fifth connection member interposed between a first positive electrode end of the second cell and a first positive electrode end of the second cell, and a fifth connection member of the second cell. (2) a sixth connecting member interposed between the positive electrode end and the positive electrode end of the third cell, a first negative electrode end of the second cell and a first negative electrode end of the third cell A seventh connection member interposed between the second cell and an eighth connection member interposed between the second negative electrode end of the second cell and the second negative electrode end of the third cell. The stacked battery according to claim 8, comprising: 前記第5連結部材、前記第6連結部材、前記第7連結部材及び前記第8連結部材は導電性である請求項12に記載の積層型電池。The stacked battery according to claim 12, wherein the fifth connection member, the sixth connection member, the seventh connection member, and the eighth connection member are conductive.
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