JP5197103B2 - Multilayer battery, multilayer electrode assembly manufacturing jig, and multilayer battery manufacturing method using the jig - Google Patents

Multilayer battery, multilayer electrode assembly manufacturing jig, and multilayer battery manufacturing method using the jig Download PDF

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JP5197103B2
JP5197103B2 JP2008092427A JP2008092427A JP5197103B2 JP 5197103 B2 JP5197103 B2 JP 5197103B2 JP 2008092427 A JP2008092427 A JP 2008092427A JP 2008092427 A JP2008092427 A JP 2008092427A JP 5197103 B2 JP5197103 B2 JP 5197103B2
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current collecting
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JP2009245819A (en
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雅之 藤原
淳浩 船橋
昌孝 新屋敷
仁史 前田
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Sanyo Electric Co Ltd
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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

Description

本発明は、例えば、ロボット、電気自動車、バックアップ電源等に使用される積層式電池及びその製造方法に関し、特に、ハイレートでの充放電特性を向上させることができる積層式リチウムイオン電池及びその製造方法に関する。   The present invention relates to a stacked battery used for, for example, a robot, an electric vehicle, a backup power source, and the like, and a manufacturing method thereof, and more particularly, a stacked lithium ion battery capable of improving charge / discharge characteristics at a high rate and a manufacturing method thereof. About.

近年、電池は、携帯電話、ノートパソコン、PDA等の移動情報端末の電源のみならず、ロボット、電気自動車、バックアップ電源などに使用されるようになってきており、さらなる高容量化が要求されるようになってきている。このような要求に対し、リチウムイオン電池は、高いエネルギー密度を有し、高容量であるので、上記のような駆動電源として広く利用されている。   In recent years, batteries have been used not only for power sources of mobile information terminals such as mobile phones, notebook personal computers, and PDAs, but also for robots, electric vehicles, backup power sources, etc., and further increase in capacity is required. It has become like this. In response to such demands, lithium ion batteries have a high energy density and high capacity, and are therefore widely used as drive power sources as described above.

このようなリチウムイオン電池の電池形態としては、大別して、渦巻状の電極体を有底筒状の外装体に封入した筒型のものと、方形状電極を複数積層した積層電極体を有底角状の外装体または1枚又は2枚のラミネートフィルムを溶着することにより作製したラミネート外装体に封入した積層式のものとがある。   Battery types of such a lithium ion battery are roughly classified into a cylindrical type in which a spiral electrode body is enclosed in a bottomed cylindrical exterior body, and a laminated electrode body in which a plurality of rectangular electrodes are stacked. There is a laminated type encapsulated in a rectangular outer package or a laminate outer package produced by welding one or two laminated films.

これらリチウムイオン電池のうち、ラミネート外装体に封入した積層式電池においては、正極集電タブを有するシート状の正極板と、負極集電タブを有するシート状の負極板とを、セパレータを介して必要な数だけ積層されるような積層電極体を有し、且つ、正極集電タブは重畳状態で正極集電端子に溶着される一方、上記負極集電タブは重畳状態で負極集電端子に溶着され、これら両集電端子がラミネート外装体から突出するような構造である。   Among these lithium ion batteries, in a laminated battery sealed in a laminate outer package, a sheet-like positive electrode plate having a positive electrode current collecting tab and a sheet-like negative electrode plate having a negative electrode current collecting tab are interposed via a separator. The positive electrode current collecting tab is welded to the positive electrode current collector terminal in a superimposed state, while the negative electrode current collector tab is superimposed on the negative electrode current collector terminal. The current collecting terminals are welded and project from the laminate outer package.

上記構造の電池では、正極集電タブと正極集電端子との溶着時及び負極集電タブと負極集電端子との溶着時に、正極集電タブと正極集電端子との位置決め及び負極集電タブと負極集電端子との位置決めを目視により行なっていた。このため、正極集電タブと正極集電端子との相対的な位置及び負極集電タブと負極集電端子との相対的な位置が電池毎に異なり、ラミネート外装体から両集電端子が突出する位置や、両集電端子間の距離等が電池毎に異なっていた。この結果、多数の素電池を用いて組電池化を図る際、集電端子間の電気的な接続を円滑に行なうことができず、信頼性や生産性が低下するという課題を有していた。   In the battery having the above structure, the positioning of the positive current collecting tab and the positive current collecting terminal and the negative current collecting are performed when the positive current collecting tab and the positive current collecting terminal are welded and when the negative current collecting tab and the negative current collecting terminal are welded. The tab and the negative electrode current collecting terminal were positioned visually. For this reason, the relative position between the positive electrode current collecting tab and the positive electrode current collecting terminal and the relative position between the negative electrode current collecting tab and the negative electrode current collecting terminal are different for each battery, and both current collecting terminals protrude from the laminate outer package. The position of the battery and the distance between the current collecting terminals differed from battery to battery. As a result, when making a battery pack using a large number of unit cells, electrical connection between the current collecting terminals cannot be smoothly performed, and there is a problem that reliability and productivity are lowered. .

また、積層されている集電タブの外側に突片を回して、複数の集電タブを同時に結束するとともに、突片を介して溶接電極を当て、各集電タブ間、及び集電タブと突片との間を溶接して一体化するような技術が提案されている(下記特許文献1参照)。しかし、この技術は、単に、集電タブを一体化する技術であり、集電タブと集電端子との位置決めを容易化する技術ではない。   In addition, the projecting piece is turned to the outside of the stacked current collecting tabs, and a plurality of current collecting tabs are bundled at the same time, and welding electrodes are applied through the projecting pieces, and between the current collecting tabs and the current collecting tabs. There has been proposed a technique for welding and integrating between the projecting pieces (see Patent Document 1 below). However, this technique is simply a technique for integrating the current collecting tabs and is not a technique for facilitating the positioning of the current collecting tabs and the current collecting terminals.

特開平8−167408号公報JP-A-8-167408

本発明は上記課題を考慮したものであって、多数の電池を用いて組電池化を行なう際、集電端子間の電気的な接続を円滑に行なうことができることにより、信頼性や生産性の向上を図ることができる積層式電池、積層電極体群作製冶具及びその冶具を用いた積層式電池の製造方法を提供することを目的としている。   The present invention has been made in consideration of the above-described problems. When an assembled battery is formed using a large number of batteries, the electrical connection between the current collecting terminals can be smoothly performed, thereby improving reliability and productivity. It is an object of the present invention to provide a laminated battery, a laminated electrode body group production jig, and a method for producing a laminated battery using the jig, which can be improved.

上記目的を達成するために本発明は、各々正極集電タブが延出された複数の正極板と、各々負極集電タブが延出された複数の負極板とが、セパレータを介して交互に積層された積層電極体を有し、且つ、この積層電極体が電解液と共に、金属層と樹脂層とを備えたラミネートフィルムの周縁同士を溶着することにより形成されたラミネート外装体の収納空間内に配置され、しかも、上記正極集電タブは重畳状態で正極集電端子に接合され、上記負極集電タブは重畳状態で負極集電端子に接合され、これら両集電端子がラミネート外装体から突出する積層式電池であって、上記両集電端子が突出する部位に存在するラミネート外装体の内側面と上記積層電極体との間に存在する空間内には、上記積層電極体の幅と略同一の長さであって両端が上記積層電極体の両側面と略同位置に存在するスペーサが配置されており、且つ、上記両集電端子には位置合わせ用貫通孔が形成される一方、上記スペーサにおける上記位置合わせ用貫通孔に対応する位置には、当該貫通孔に嵌る位置合わせ用突起が設けられ、上記スペーサにおける上記両集電端子間に対応する位置には、両集電端子の内向き移動を規制する内向き移動規制用突起が設けられていることを特徴とする。 In order to achieve the above object, the present invention provides a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab, alternately through separators. The laminated electrode body has a laminated electrode body, and the laminated electrode body is formed by welding together the peripheral edges of a laminate film including a metal layer and a resin layer together with an electrolyte solution. In addition, the positive current collecting tab is joined to the positive current collecting terminal in a superimposed state, and the negative current collecting tab is joined to the negative current collecting terminal in a superimposed state. In the projecting stacked battery, the space between the inner surface of the laminate outer package and the stacked electrode body present at the projecting portions of the current collector terminals and the width of the stacked electrode body Approximate length and both ends up Spacers that are present at substantially the same positions as both side surfaces of the laminated electrode body are disposed, and both current collecting terminals are formed with alignment through holes, while the alignment through holes in the spacers are formed in the alignment through holes. An alignment protrusion that fits into the through-hole is provided at a corresponding position, and an inward movement restriction that restricts the inward movement of the current collector terminals at a position corresponding to the position between the current collector terminals of the spacer. Protrusion protrusions are provided .

ラミネート外装体の内側面と上記積層電極体との間に存在する空間内に配置されているスペーサが、積層電極体の幅と略同一の長さであって両端が積層電極体の両側面と略同位置に存在していれば、積層電極体とスペーサとの相対位置が決定されるので、積層電極体の一部を構成する正極から延出された正極集電タブとスペーサとの相対位置、及び、積層電極体の一部を構成する負極から延出された負極集電タブとスペーサとの相対位置も決定されることになる。また、両集電端子には位置合わせ用貫通孔が形成される一方、スペーサにおける位置合わせ用貫通孔に対応する位置には、貫通孔に嵌る位置合わせ用突起が設けられているので、正極集電端子とスペーサとの相対位置、及び、負極集電端子とスペーサとの相対位置が決定される。これらのことから、スペーサを介して、正極集電タブと正極集電端子、及び、負極集電タブと負極集電端子との相対位置が決定されることになる。したがって、ラミネート外装体から両集電端子が突出する位置や、両集電端子間の距離等が各電池毎に異なるのを抑制することができるので、多数の電池を用いて組電池化を行なう際、集電端子間の電気的な接続を円滑に行なうことができ、組電池の信頼性や生産性が低下するのを抑制することができる。   The spacer disposed in the space existing between the inner surface of the laminate outer package and the laminated electrode body has a length substantially the same as the width of the laminated electrode body, and both ends are opposite to the both side surfaces of the laminated electrode body. Since the relative position between the laminated electrode body and the spacer is determined if they are at substantially the same position, the relative position between the positive electrode current collecting tab and the spacer extended from the positive electrode constituting a part of the laminated electrode body And the relative position of the negative electrode current collection tab extended from the negative electrode which comprises a part of laminated electrode body, and a spacer is also determined. In addition, since the through holes for alignment are formed in both current collecting terminals, the alignment protrusions that fit into the through holes are provided at positions corresponding to the through holes for alignment in the spacer. A relative position between the electric terminal and the spacer and a relative position between the negative electrode current collecting terminal and the spacer are determined. From these things, the relative positions of the positive electrode current collecting tab and the positive electrode current collecting terminal and the negative electrode current collecting tab and the negative electrode current collecting terminal are determined via the spacer. Therefore, since it can suppress that the position which both the current collection terminals protrude from a laminate exterior body, the distance between both current collection terminals, etc. for every battery, it can carry out battery assembly using many batteries. At this time, electrical connection between the current collecting terminals can be performed smoothly, and deterioration of reliability and productivity of the assembled battery can be suppressed.

また、両集電端子に形成された位置合わせ用貫通孔と、スペーサに形成された位置合わせ用突起とにより、両集電端子の移動は抑制されるが、スペーサにおける両集電端子間に対応する位置に内向き移動規制用突起を形成すれば、より確実に両集電端子の内向き移動を抑制できる。また、内向き移動規制用突起が設けられていれば、位置合わせ用突起より位置合わせ用貫通孔を若干大きく形成しても、両集電端子の内向き移動を抑制できるので、組電池の信頼性や生産性が低下するのを抑制しつつ、位置合わせ用貫通孔に位置合わせ用突起を嵌め込む際の作業性が向上する。 In addition, the movement of both current collector terminals is suppressed by the alignment through holes formed in both current collector terminals and the alignment projections formed in the spacer, but it corresponds between the current collector terminals in the spacer. If the inward movement restricting projections are formed at the positions where the current collecting terminals are formed, the inward movement of both current collecting terminals can be suppressed more reliably. Also, if the inward movement restricting protrusion is provided, the inward movement of both current collecting terminals can be suppressed even if the alignment through-hole is made slightly larger than the alignment protrusion. The workability at the time of fitting the alignment protrusion into the alignment through hole is improved while suppressing the decrease in productivity and productivity.

上記スペーサにおける上記両集電端子との接触位置より外方側には、両集電端子の外向き移動を規制する外向き移動規制用突起が設けられていることが望ましい。
内向き移動規制用突起の場合と同様の理由により、より確実に両集電端子の移動を抑制できると共に、位置合わせ用貫通孔に位置合わせ用突起を嵌め込む際の作業性が向上する。
It is desirable that an outward movement restricting projection for restricting the outward movement of both current collecting terminals is provided on the outer side of the spacer in contact with the both current collecting terminals.
For the same reason as in the case of the inward movement restricting projection, it is possible to more reliably suppress the movement of both current collecting terminals and to improve the workability when fitting the alignment projection into the alignment through hole.

上記正極集電端子の両面に上記正極集電タブが重ねられた状態で両者が接合される一方、上記負極集電端子の両面に上記負極集電タブが重ねられた状態で両者が接合され、且つ、上記両集電端子の両面にスペーサがそれぞれ配置されており、しかも、一方のスペーサには上記位置合わせ用突起が設けられ、他方のスペーサには上記位置合わせ用突起が嵌る位置合わせ用孔が設けられていることが望ましい。
2つのスペーサで両集電端子を挟む構成であれば、両集電端子の固定が一層確実なものとなり、且つ、一方のスペーサには上記位置合わせ用突起が設けられ、他方のスペーサには位置合わせ用突起が嵌る位置合わせ用孔が設けられていれば、スペーサ同士に位置合わせも確実なものとなる。
Both are joined in a state where the positive current collecting tab is superimposed on both surfaces of the positive current collecting terminal, while both are joined in a state where the negative current collecting tab is superimposed on both sides of the negative current collecting terminal, In addition, spacers are arranged on both surfaces of the current collecting terminals, and the alignment protrusion is provided in one spacer, and the alignment protrusion is fitted in the other spacer. It is desirable to be provided.
If both current collector terminals are sandwiched between two spacers, both current collector terminals are more securely fixed, and one spacer is provided with the above-mentioned alignment projection, and the other spacer is positioned. If the alignment hole into which the alignment protrusion fits is provided, the alignment between the spacers can be ensured.

上記正極集電端子の一方の面にのみ上記正極集電タブが重ねられた状態で両者が接合される一方、上記負極集電端子の一方の面にのみ上記負極集電タブが重ねられた状態で両者が接合され、且つ、上記両集電端子における接合部位が存在する面にのみ上記スペーサが配置されていることが望ましい。
上記構成であれば、スペーサは1つだけで良いので、電池の製造コストを低減できる。
A state in which the positive electrode current collector tab is overlapped only on one surface of the positive electrode current collector terminal and the both are joined, while a state in which the negative electrode current collector tab is overlapped only on one surface of the negative electrode current collector terminal It is desirable that the spacer is disposed only on the surface where the two are joined and the joint portions of the two current collecting terminals are present.
If it is the said structure, since only one spacer is sufficient, the manufacturing cost of a battery can be reduced.

各々正極集電タブが延出された複数の正極板と、各々負極集電タブが延出された複数の負極板とが、セパレータを介して交互に積層された積層電極体、上記正極集電タブが重畳状態で接合される正極集電端子、上記負極集電タブが重畳状態で接合される負極集電端子、及び、両集電タブの接合部位近傍に配置される絶縁性のスペーサ、を一体化して積層電極体群を作製するための積層電極体群作製冶具であって、上記積層電極体の両集電タブが延出された部位に上記スペーサが配置された形状と略同形状を成す第1凹部と、上記正極集電端子及び上記負極集電端子と略同形状を成す2つの第2凹部とが形成され、且つ、上記正極集電タブと上記正極集電端子との接合部位及び上記負極集電タブと上記負極集電端子との接合部位にそれぞれ対応する部位には接合装置を挿入するための接合装置用貫通孔が形成されていることを特徴とする。   A laminated electrode body in which a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab are alternately laminated via a separator, the positive electrode current collector A positive current collecting terminal to which the tab is joined in an overlapping state, a negative current collecting terminal to which the negative current collecting tab is joined in an overlapping state, and an insulating spacer disposed in the vicinity of the joining portion of both current collecting tabs, A laminated electrode body group making jig for producing a laminated electrode body group by integrating, and having substantially the same shape as the shape in which the spacers are arranged in a portion where both current collecting tabs of the laminated electrode body are extended. A first recessed portion formed, and two second recessed portions having substantially the same shape as the positive current collecting terminal and the negative current collecting terminal, and a joining portion between the positive current collecting tab and the positive current collecting terminal And corresponding to the joining part of the negative electrode current collector tab and the negative electrode current collector terminal That is a portion wherein the bonding device through hole for inserting a bonding device is formed.

積層電極体の両集電タブが延出された部位にスペーサが配置された形状と略同形状を成す第1凹部が形成されていれば、積層電極体とスペーサとの相対位置が決定されるので、積層電極体の一部を構成する正負両極から各々延出された両集電タブとスペーサとの相対位置も決定されることになる。また、正極集電端子及び負極集電端子と略同形状を成す2つの第2凹部が形成されていれば、両集電端子とスペーサとの相対位置、及び、両集電端子と両集電タブとの相対位置が決定されることになる。したがって、ラミネート外装体から両集電端子が突出する位置や、両集電端子間の距離等が電池毎に異なるのを抑制することができるので、多数の電池を用いて組電池化を行なう際、集電端子間の電気的な接続を円滑に行なうことができ、組電池の信頼性や生産性が低下するのを抑制することができる。   If a first recess having substantially the same shape as the spacer is formed at a portion where both current collecting tabs of the laminated electrode body are extended, the relative position between the laminated electrode body and the spacer is determined. Therefore, the relative positions of the current collecting tabs and the spacers respectively extending from the positive and negative electrodes constituting a part of the laminated electrode body are also determined. In addition, if two second recesses having substantially the same shape as the positive current collecting terminal and the negative current collecting terminal are formed, the relative positions of both the current collecting terminals and the spacer, and both the current collecting terminals and the both current collecting terminals. The relative position to the tab will be determined. Therefore, since it can suppress that the position where both current collection terminals protrude from a laminate exterior body, the distance between both current collection terminals, etc. for every battery, when carrying out battery assembly using many batteries Thus, electrical connection between the current collecting terminals can be performed smoothly, and deterioration of the reliability and productivity of the assembled battery can be suppressed.

各々正極集電タブが延出された複数の正極板と、各々負極集電タブが延出された複数の負極板とが、セパレータを介して交互に積層された積層電極体、上記正極集電タブが重畳状態で接合される正極集電端子、上記負極集電タブが重畳状態で接合される負極集電端子、及び、両集電タブの接合部位近傍に配置される絶縁性のスペーサ、を一体化して積層電極体群を作製するための積層電極体群作製冶具であって、上記積層電極体の両集電タブが延出された部位に上記スペーサが配置された形状と略同形状を成す第1凹部と、上記正極集電端子及び上記負極集電端子と略同形状を成す2つの第2凹部とが形成され、且つ、上記正極集電タブと上記正極集電端子との接合部位及び上記負極集電タブと上記負極集電端子との接合部位にそれぞれ対応する部位には、接合装置を挿入するための接合装置用貫通孔が形成されている積層電極体群作製冶具を用いた、以下のステップを有することを特徴とする積層式電池の製造方法、即ち、正極集電タブが延出された複数の正極板と、負極集電タブが延出された複数の負極板とを、セパレータを介して交互に積層して板状の積層電極体を作製する積層電極体作製ステップと、接合装置を挿入するための接合装置用貫通孔が形成されスペーサと上記積層電極体とを上記第1凹部に載置すると共に、正極集電端子と負極集電端子とをそれぞれ第2凹部に載置した後、上記積層電極体群作製冶具及び上記スペーサに形成された接合装置用貫通孔に接合装置を挿入することにより、重畳状態の上記正極集電タブと上記正極集電端子とを接合すると共に、重畳状態の上記負極集電タブと上記負極集電端子とを接合して、積層電極体群を作製する積層電極体群作製ステップと、ラミネートフィルムの収納凹部内に上記積層電極体群を配置した後、一部を残して上記ラミネートフィルムの周縁同士を溶着する溶着ステップと、上記ラミネートフィルムで構成されたラミネート外装体の開口部から電解液を注液する注液ステップと、上記ラミネート外装体の内部の減圧状態を維持しつつ、ラミネート外装体の開口部を封止する封止ステップと、を有することを特徴とする。 A laminated electrode body in which a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab are alternately laminated via a separator, the positive electrode current collector A positive current collecting terminal to which the tab is joined in an overlapping state, a negative current collecting terminal to which the negative current collecting tab is joined in an overlapping state, and an insulating spacer disposed in the vicinity of the joining portion of both current collecting tabs, A laminated electrode body group making jig for producing a laminated electrode body group by integrating, and having substantially the same shape as the shape in which the spacers are arranged in a portion where both current collecting tabs of the laminated electrode body are extended. A first recessed portion formed, and two second recessed portions having substantially the same shape as the positive current collecting terminal and the negative current collecting terminal, and a joining portion between the positive current collecting tab and the positive current collecting terminal And corresponding to the joining part of the negative electrode current collector tab and the negative electrode current collector terminal The site that a method for manufacturing a stack type battery, characterized in that it comprises using a laminated electrode body group making jig joining device through hole is formed for inserting the joining device, the following steps, namely Then, a plurality of positive electrode plates with the positive electrode current collecting tab extended and a plurality of negative electrode plates with the negative electrode current collector tab extended are alternately laminated via a separator to produce a plate-like laminated electrode body. A laminated electrode body manufacturing step, a joining device through-hole for inserting a joining device is formed, and a spacer and the laminated electrode body are placed in the first recess, and a positive current collecting terminal and a negative current collecting terminal Are placed in the second recesses, respectively, and then the superposed positive electrode current collecting tab and the positive electrode are inserted by inserting a joining device into the through hole for the joining device formed in the laminated electrode body group fabrication jig and the spacer. While joining the current collector terminal, After the negative electrode current collecting tab in the state and the negative electrode current collector terminal are joined, a laminated electrode body group production step for producing a laminated electrode body group, and after the laminated electrode body group is disposed in the storage recess of the laminated film A step of welding the peripheral edges of the laminate film, leaving a part, a step of injecting an electrolyte solution from an opening of the laminate outer body composed of the laminate film, and an inside of the laminate outer body And a sealing step for sealing the opening of the laminate outer package while maintaining the reduced pressure state.

本発明によれば、多数の電池を用いて組電池化を行なう際、集電端子間の電気的な接続を円滑に行なうことができることにより、信頼性や生産性の向上を図ることができるといった優れた効果を奏する。   According to the present invention, when an assembled battery is formed using a large number of batteries, electrical connection between current collecting terminals can be smoothly performed, thereby improving reliability and productivity. Excellent effect.

以下、本発明の一例に係る積層式電池(角型リチウムイオン電池)を、図1〜図19に基づいて説明する。なお、本発明における積層式電池は、下記の形態に示したものに限定されず、その要旨を変更しない範囲において適宜変更して実施できるものである。   Hereinafter, a stacked battery (rectangular lithium ion battery) according to an example of the present invention will be described with reference to FIGS. The laminated battery according to the present invention is not limited to those shown in the following embodiments, and can be implemented with appropriate modifications within a range not changing the gist thereof.

(積層式電池の構造)
図1に示すように、積層式電池は積層電極体10を有しており、この積層電極体10は、2枚のセパレータから成り内部に正極板1が配置された袋状セパレータ3と負極板2とが多数積層され、且つ、最外位置には負極板2が配置される構造となっている。このように、最外位置に負極板2が配置されることから、負極板2の枚数が正極板1の枚数より1枚多くなるように構成されている(具体的には、正極板1は50枚、負極板2は51枚で構成されている)。
(Structure of stacked battery)
As shown in FIG. 1, the laminated battery has a laminated electrode body 10, and this laminated electrode body 10 is composed of two separators, a bag-like separator 3 having a positive electrode plate 1 disposed therein, and a negative electrode plate. 2 is laminated, and the negative electrode plate 2 is arranged at the outermost position. Thus, since the negative electrode plate 2 is arranged at the outermost position, the number of the negative electrode plates 2 is configured to be one more than the number of the positive electrode plates 1 (specifically, the positive electrode plate 1 is 50 sheets and 51 negative electrode plates 2).

また、図5に示すように、積層電極体10(積層電極体作製直後、即ち、ラミネート外装体の収納空間内に収納される前の厚さL11は12mm)の外周部には積層電極体10を跨ぐように、各電極板1、2のずれを抑制するためのテープ5が貼着されている。更に、上記積層電極体10は、図2に示すような2枚のラミネートフィルム28を溶着することにより形成したラミネート外装体25の収納空間の内部に、電解液と共に封入されており、上記ラミネート外装体25からは、アルミニウム板(厚さ:0.5mm)から成る正極集電端子15と、銅板(厚さ:0.5mm)から成る負極集電端子16とが突出する構造となっている。そして、図12に示すように、上記正極集電端子15には、後述のスペーサ30に形成された位置合わせ用突起32cが挿通する位置合わせ用貫通孔15aが形成されており、上記負極集電端子16には、後述のスペーサ30に形成された位置合わせ用突起33cが挿通する位置合わせ用貫通孔16aが形成されている。尚、上記ラミネートフィルム28はアルミニウム箔の両面に樹脂層が形成される構造であり、また、図2及び後述する図6の符号27は2枚のラミネートフィルム28の溶着部である。   Further, as shown in FIG. 5, the laminated electrode body 10 is formed on the outer peripheral portion of the laminated electrode body 10 (immediately after the production of the laminated electrode body, that is, the thickness L11 is 12 mm before being housed in the housing space of the laminated exterior body). The tape 5 for suppressing the shift | offset | difference of each electrode plates 1 and 2 is stuck so that it may straddle. Further, the laminated electrode body 10 is sealed together with an electrolytic solution in a storage space of a laminated exterior body 25 formed by welding two laminated films 28 as shown in FIG. From the body 25, a positive electrode current collecting terminal 15 made of an aluminum plate (thickness: 0.5 mm) and a negative electrode current collecting terminal 16 made of a copper plate (thickness: 0.5 mm) are projected. As shown in FIG. 12, the positive electrode current collecting terminal 15 is formed with an alignment through hole 15a through which an alignment protrusion 32c formed in a spacer 30 described later is inserted. The terminal 16 is formed with an alignment through-hole 16a through which an alignment projection 33c formed on a spacer 30 described later is inserted. The laminate film 28 has a structure in which a resin layer is formed on both sides of an aluminum foil, and reference numeral 27 in FIG. 2 and FIG. 6 described later is a welded portion of the two laminate films 28.

上記正極板1は、図3(a)に示すように、方形状のアルミニウム箔(厚さ:15μm)から成る正極用導電性芯体の両面の全面に、LiCoO2から成る正極活物質と、カーボンブラックから成る導電剤と、ポリフッ化ビニリデンから成る結着剤とから構成される正極活物質層1aが設けられる構造となっている。上記正極板1の幅L1は95mm、高さL2は95mmとなっており、また、正極板1の一辺からは、上記正極用導電性芯体と一体形成されると共に上記正極活物質層1aが設けられていない正極集電タブ11(幅L3は30mm、高さL4は20mm)が突出する構造となっている。この正極集電タブ11は、上記正極集電端子15(幅L14は30mm)の両面に重ねられた状態で(正極集電端子15の各面に25枚ずつ重ねられた状態で)、上記正極集電端子15と溶着されている。 As shown in FIG. 3A, the positive electrode plate 1 has a positive electrode active material made of LiCoO 2 on the entire surface of both sides of a positive electrode conductive core made of a rectangular aluminum foil (thickness: 15 μm). A positive electrode active material layer 1a composed of a conductive agent made of carbon black and a binder made of polyvinylidene fluoride is provided. The positive electrode plate 1 has a width L1 of 95 mm and a height L2 of 95 mm. Further, from one side of the positive electrode plate 1, the positive electrode active material layer 1a is integrally formed with the positive electrode conductive core. The positive electrode current collection tab 11 (width L3 is 30 mm, height L4 is 20 mm) which is not provided has a structure protruding. The positive electrode current collecting tab 11 is overlaid on both surfaces of the positive electrode current collector terminal 15 (width L14 is 30 mm) (in a state where 25 sheets are overlaid on each surface of the positive electrode current collector terminal 15). It is welded to the current collecting terminal 15.

上記袋状セパレータ3は、図3(c)に示すように、2枚のポリプロピレン(PP)製のセパレータ3aを重ね合わせ、これらセパレータ3aの周辺部においてセパレータ3a同士を融着する融着部4を設けるような構成である。このような構成とすることにより、上記正極板1を袋状セパレータ3内に収納できる。尚、上記セパレータ3aは、図3(b)に示すように、高さL5は100mm、幅L6は100mmの方形状を成しており、また、その厚さは30μmとなっている。   As shown in FIG. 3C, the bag-like separator 3 is composed of two polypropylene (PP) separators 3a, and a fusion part 4 for fusing the separators 3a around each other in the peripheral part of the separators 3a. It is the structure which provides. With such a configuration, the positive electrode plate 1 can be stored in the bag-like separator 3. As shown in FIG. 3B, the separator 3a has a rectangular shape with a height L5 of 100 mm, a width L6 of 100 mm, and a thickness of 30 μm.

上記負極板2は、図4に示すように、方形状の銅箔(厚さ:10μm)から成る負極用導電性芯体の両面の全面に、天然黒鉛から成る負極活物質と、ポリフッ化ビニリデンから成る結着剤とから構成される負極活物質層2aが設けられる構造となっている。上記負極板2の幅L7は100mm、高さL8は100mmであり、上記セパレータ3aと同様の大きさとなっている。また、負極板2の一辺からは、上記負極用導電性芯体と一体形成されると共に上記負極活物質層2aが設けられていない負極集電タブ12(幅L9は30mm、高さL10は20mm)が突出する構造となっている。この負極集電タブ12は、上記負極集電端子16(幅L14は30mm)の両面に重ねられた状態で(負極集電端子16の一方の面に25枚、他方の面に26枚重ねられた状態で)、上記負極集電端子16と溶着されている。   As shown in FIG. 4, the negative electrode plate 2 has a negative electrode active material made of natural graphite and polyvinylidene fluoride on both surfaces of a negative electrode conductive core made of a rectangular copper foil (thickness: 10 μm). The negative electrode active material layer 2a comprised from the binder which consists of is provided. The negative electrode plate 2 has a width L7 of 100 mm and a height L8 of 100 mm, which is the same size as the separator 3a. Further, from one side of the negative electrode plate 2, the negative electrode current collecting tab 12 (integrated with the negative electrode conductive core and not provided with the negative electrode active material layer 2a (width L9 is 30 mm, height L10 is 20 mm). ) Protrudes. The negative electrode current collecting tabs 12 are overlaid on both surfaces of the negative electrode current collector terminal 16 (width L14 is 30 mm) (25 sheets on one surface of the negative electrode current collector terminal 16 and 26 sheets on the other surface). In this state, the negative electrode current collector terminal 16 is welded.

ここで、図6及び図7に示すように、上記2枚のラミネートフィルム28から構成されるラミネート外装体25の収納空間18内には、上記積層電極体10の他に、上記両集電タブ11、12と上記両集電端子15、16とを挟むように2つの絶縁性のスペーサ30、40が配置されている。より具体的には、当該スペーサ30、40は、上記両集電端子15、16が突出するラミネート外装体25の内側面と上記積層電極体10との間に存在する空間であって、上記両集電タブ11、12の重畳部位35(尚、図7においては正極集電タブ11の重畳部位35のみ示したが、負極集電タブ12も同様となっている)を除いた空間に配置されている。尚、図6における符号50は、無延伸ポリオレフィン材料から成る樹脂部であり、上記ラミネート外装体の溶着位置に存在する両集電端子15、16を覆っている。この樹脂部50の存在により、両集電端子15、16が存在するラミネートフィルムの溶着部を確実に封止することができる。   Here, as shown in FIG. 6 and FIG. 7, in addition to the laminated electrode body 10, both the current collecting tabs are provided in the storage space 18 of the laminated exterior body 25 composed of the two laminated films 28. Two insulating spacers 30 and 40 are arranged so as to sandwich the current collecting terminals 11 and 12 and the current collecting terminals 15 and 16. More specifically, the spacers 30 and 40 are spaces existing between the inner surface of the laminate outer package 25 from which the current collector terminals 15 and 16 protrude and the laminated electrode body 10, Arranged in a space excluding the overlapping portion 35 of the current collecting tabs 11 and 12 (in FIG. 7, only the overlapping portion 35 of the positive electrode collecting tab 11 is shown, but the negative electrode collecting tab 12 is also the same). ing. Reference numeral 50 in FIG. 6 denotes a resin portion made of an unstretched polyolefin material, which covers both current collecting terminals 15 and 16 existing at the welding position of the laminate outer package. Due to the presence of the resin portion 50, the welded portion of the laminate film where the current collecting terminals 15 and 16 are present can be reliably sealed.

上記スペーサ30、40のうちスペーサ30の具体的な構造は、図8及び図9(a)〜(c)に示すように、長さL20が98mm、幅L21が17mm、高さL22が6mmとなっており、中央部に設けられた内向き移動規制用突起部31と、この内向き移動規制用突起部31の両側に設けられた集電タブ当接部32、33(長さL24、L25が共に33mm)とから構成されている。上記内向き移動規制用突起部31の長さL23は32mmであり、上記両集電端子15、16間の距離と略同等なるように形成されている。これにより、両集電端子15、16が内向きに移動するのを抑制できる。また、上記集電タブ当接部32、33の端部には、それぞれ、外向き移動規制用突起部32a、33aが形成されており、これにより、両集電端子15、16が外向きに移動するのを抑制できる。   As shown in FIGS. 8 and 9A to 9C, the specific structure of the spacer 30 among the spacers 30 and 40 is such that the length L20 is 98 mm, the width L21 is 17 mm, and the height L22 is 6 mm. And the inward movement restricting protrusion 31 provided in the central portion, and the current collecting tab abutting portions 32 and 33 (lengths L24 and L25) provided on both sides of the inward movement restricting protrusion 31. Are both 33 mm). The inward movement restricting projection 31 has a length L23 of 32 mm, and is formed to be substantially equal to the distance between the current collecting terminals 15 and 16. Thereby, it can suppress that both the current collection terminals 15 and 16 move inward. Also, outward movement restricting projections 32a and 33a are formed at the ends of the current collecting tab contact portions 32 and 33, respectively, so that the current collecting terminals 15 and 16 are directed outward. It can suppress moving.

また、本実施形態では、上記外向き移動規制用突起部32a、33aの幅L27、L28は共に3mmとなっているので、上記内向き移動規制用突起部31と上記外向き移動規制用突起部32aとの距離L29、及び、上記内向き移動規制用突起部31と上記外向き移動規制用突起部33aとの距離L30は共に30mmであり、両集電端子15、16の幅L13、L14(図6参照)と同じとなるように構成されているので、両集電端子15、16が内向き及び外向きに移動するのを確実に防止できる。尚、外向き移動規制用突起部32a、33aの高さと、上記内向き移動規制用突起部31と集電タブ当接部32、33との間の段差は同じであり、具体的にはL26=0.5mmとなっている。   In this embodiment, since the widths L27 and L28 of the outward movement restricting protrusions 32a and 33a are both 3 mm, the inward movement restricting protrusion 31 and the outward movement restricting protrusion The distance L29 between the current collecting terminals 15 and 16 and the distance L30 between the inward movement restricting protrusion 31 and the outward movement restricting protrusion 33a are both 30 mm, and the widths L13 and L14 ( 6), the current collecting terminals 15 and 16 can be reliably prevented from moving inward and outward. The heights of the outward movement restricting projections 32a and 33a and the step between the inward movement restricting projection 31 and the current collecting tab contact portions 32 and 33 are the same, and specifically, L26. = 0.5 mm.

更に、上記集電タブ当接部32、33には、後述の超音波溶接装置(接合装置)のアンビルを挿入するための超音波溶接装置用貫通孔32b、33bが、各々2個ずつ形成されており、2つの超音波溶接装置用貫通孔32b間には位置合わせ用突起32cが形成され、2つの超音波溶接装置用貫通孔33b間には位置合わせ用突起33cが形成されている。上記位置合わせ用突起32cが上記正極集電端子15に形成された位置合わせ用貫通孔15aを挿通し、上記位置合わせ用突起33cが上記負極集電端子16に形成された位置合わせ用貫通孔16aを挿通することにより、スペーサ30(積層電極体10)と両集電端子15、16との位置合わせが正確に行なわれることになる。また、積層電極体10側の集電タブ当接部32、33には、各々R部32d、33dが設けられており、これにより両集電タブ11、12に大きな負荷が加わるのを防止している。   Furthermore, two through-holes 32b and 33b for ultrasonic welding devices for inserting an anvil of an ultrasonic welding device (joining device) described later are formed in the current collecting tab contact portions 32 and 33, respectively. An alignment projection 32c is formed between the two ultrasonic welding device through holes 32b, and an alignment projection 33c is formed between the two ultrasonic welding device through holes 33b. The alignment protrusion 32 c is inserted through the alignment through hole 15 a formed in the positive current collector terminal 15, and the alignment protrusion 33 c is formed in the negative current collector terminal 16. As a result, the spacer 30 (laminated electrode body 10) and the current collecting terminals 15 and 16 are accurately aligned. The current collecting tab abutting portions 32 and 33 on the laminated electrode body 10 side are provided with R portions 32d and 33d, respectively, thereby preventing a large load from being applied to the current collecting tabs 11 and 12. ing.

一方、上記スペーサ40は、図10に示すように、移動規制用突起部41と、この内向き移動規制用突起部41の両側に設けられた集電タブ当接部42、43とから構成されている点、及び、集電タブ当接部42、43の端部には、それぞれ、外向き移動規制用突起部42a、43aが形成されて点は上記スペーサ30と同様の構成であり、また、各種寸法も上記スペーサ30と同様である。但し、超音波溶接装置用貫通孔32b、33bが形成されていない点、及び、位置合わせ用突起32c、33cの代わりに、位置合わせ用貫通孔42c、43c(形成部位は位置合わせ用突起32c、33cに対応する部位である)が形成されている点が異なっている。   On the other hand, as shown in FIG. 10, the spacer 40 includes a movement restricting projection 41 and current collecting tab abutting portions 42 and 43 provided on both sides of the inward movement restricting projection 41. And outward movement restricting projections 42a and 43a are formed at the ends of the current collecting tab contact portions 42 and 43, respectively, and the configuration is the same as that of the spacer 30. Various dimensions are the same as those of the spacer 30. However, the through holes 32b and 33b for the ultrasonic welding apparatus are not formed, and instead of the alignment protrusions 32c and 33c, the alignment through holes 42c and 43c (the formation site is the alignment protrusion 32c, This is different in that a portion corresponding to 33c is formed.

尚、上記2枚のラミネートフィルム28(溶着前のもの)の収納凹部の深さは共に5mmであって、これら深さの和は、ラミネート外装体25の収納空間18内に収納される前の積層電極体10の厚さL11(12mm)よりも小さくなっている。このような構成とすることにより、ラミネートフィルム28同士を溶着してラミネート外装体25を作製する際に、積層電極体10の積層方向に大きな力が加わるので、積層電極体10のずれを抑制できる。   Note that the depths of the storage recesses of the two laminate films 28 (before welding) are both 5 mm, and the sum of these depths is the value before being stored in the storage space 18 of the laminate outer package 25. It is smaller than the thickness L11 (12 mm) of the laminated electrode body 10. With such a configuration, when the laminate film 28 is welded to produce the laminate outer package 25, a large force is applied in the stacking direction of the stacked electrode body 10, so that the shift of the stacked electrode body 10 can be suppressed. .

また、上記構造の電池を作製する際に用いる積層電極体群作製冶具について、以下に説明する。
図12に示すように、積層電極体群作製冶具60には、上記積層電極体10に上記スペーサ30が配置された形状と略同形状を成す第1凹部61と、上記正極集電端子15及び上記負極集電端子16と略同形状を成し上記第1凹部61より浅底の第2凹部62,63とが形成されている。上記第1凹部61の具体的な大きさは、幅L35は積層電極体10の幅(セパレータ3の幅L6や負極2の幅L7と同様の幅である)と略同様(約100mm)であり、高さL36は、積層電極体10の高さ(セパレータ3の高さL5や負極2の高さL8と同様の高さである)に、スペーサ30の幅L21を加えた長さと略同様(約117mm)となっている。また、積層電極体群作製冶具60における上記正極集電タブ11と上記正極集電端子15との溶接部位、及び上記負極集電タブ12と上記負極集電端子16との溶接部位に対応する部位には、超音波溶接装置(接合装置)のアンビルを挿入するための超音波溶接装置用貫通孔64が形成されている。
Moreover, the laminated electrode body group preparation jig used when manufacturing the battery of the said structure is demonstrated below.
As shown in FIG. 12, the laminated electrode body group fabrication jig 60 includes a first recess 61 having substantially the same shape as the spacer 30 disposed in the laminated electrode body 10, the positive electrode current collecting terminal 15, Second concave portions 62 and 63 having substantially the same shape as the negative electrode current collecting terminal 16 and shallower than the first concave portion 61 are formed. The specific size of the first recess 61 is substantially the same as the width L35 of the laminated electrode body 10 (the same width as the width L6 of the separator 3 and the width L7 of the negative electrode 2) (about 100 mm). The height L36 is substantially the same as the length obtained by adding the width L21 of the spacer 30 to the height of the laminated electrode body 10 (the same height as the height L5 of the separator 3 and the height L8 of the negative electrode 2) ( About 117 mm). Further, in the laminated electrode body group production jig 60, a portion corresponding to a welded portion between the positive electrode current collecting tab 11 and the positive electrode current collecting terminal 15 and a welded portion between the negative electrode current collector tab 12 and the negative electrode current collecting terminal 16. The through-hole 64 for ultrasonic welding apparatuses for inserting the anvil of an ultrasonic welding apparatus (joining apparatus) is formed.

(角型リチウムイオン電池の作製方法)
〔正極板が収納された袋状セパレータの作製〕
正極活物質としてのLiCoO2を90質量%と、導電剤としてのカーボンブラックを5質量%と、結着剤としてのポリフッ化ビニリデンを5質量%と、溶剤としてのN−メチル−2−ピロリドン(NMP)溶液とを混合して正極スラリーを調製した。次に、この正極スラリーを、正極集電体としてのアルミニウム箔(厚み:15μm)の両面に塗布した。その後、溶剤を乾燥し、ローラーで厚み0.1mmにまで圧縮した後、上述した幅L1及び高さL2になり且つ正極集電タブ11が突出するように切断して正極板1を作製した。最後に、2枚のセパレータ3a間に正極板1を配置した後、セパレータ3aの周縁同士を溶着することにより、袋状セパレータ3を作製した。
(Preparation method of prismatic lithium ion battery)
[Preparation of a bag-shaped separator containing a positive electrode plate]
90% by mass of LiCoO 2 as a positive electrode active material, 5% by mass of carbon black as a conductive agent, 5% by mass of polyvinylidene fluoride as a binder, N-methyl-2-pyrrolidone as a solvent ( NMP) solution was mixed to prepare a positive electrode slurry. Next, this positive electrode slurry was applied to both surfaces of an aluminum foil (thickness: 15 μm) as a positive electrode current collector. Then, after drying the solvent and compressing to a thickness of 0.1 mm with a roller, the positive electrode plate 1 was produced by cutting so as to have the above-described width L1 and height L2 and the positive electrode current collecting tab 11 protruding. Finally, after arranging the positive electrode plate 1 between the two separators 3a, the peripheral edges of the separator 3a were welded together to produce a bag-like separator 3.

〔負極板の作製〕
負極活物質としての天然黒鉛粉末を95質量%と、結着剤としてのポリフッ化ビニリデンを5質量%と、溶剤としてのNMP溶液とを混合してスラリーを調製した後、このスラリーを負極集電体としての銅箔(厚み:10μm)の両面に塗布した。その後、溶剤を乾燥し、ローラーで厚み0.08mmにまで圧縮した後、上述した幅L7及び高さL8になり且つ負極集電タブ12が突出するように切断して負極板2を作製した。
(Production of negative electrode plate)
A slurry was prepared by mixing 95% by mass of natural graphite powder as a negative electrode active material, 5% by mass of polyvinylidene fluoride as a binder, and an NMP solution as a solvent. It apply | coated on both surfaces of the copper foil (thickness: 10 micrometers) as a body. Then, after drying the solvent and compressing to a thickness of 0.08 mm with a roller, the negative electrode plate 2 was produced by cutting so as to have the above-described width L7 and height L8 and the negative electrode current collecting tab 12 protruding.

〔電池の作製〕
上述のようにして得られた負極板2(51枚)と、正極板1が収納された袋状セパレータ3(50枚)とを交互に積層して積層電極体10を作製した。尚、この積層電極体10における積層方向の端部には負極板2を配置した。次に、積層電極体10の4辺に、積層電極体10を跨ぐようにして、ずれ防止用のテープ5を貼着した。
[Production of battery]
The negative electrode plate 2 (51 sheets) obtained as described above and the bag-shaped separator 3 (50 sheets) in which the positive electrode plate 1 was housed were alternately laminated to produce a laminated electrode body 10. Note that the negative electrode plate 2 was disposed at the end of the laminated electrode body 10 in the laminating direction. Next, on the four sides of the laminated electrode body 10, a slip prevention tape 5 was stuck so as to straddle the laminated electrode body 10.

次いで、図12及び図13に示すように、積層電極体群作製冶具60の第1凹部61にスペーサ30と積層電極体10とを配置すると共に、位置合わせ用突起32c、33cに各々位置合わせ用貫通孔15a、16aを挿通しつつ、第2凹部62、63にそれぞれ正極集電端子15と負極集電端子16とを配置した。この際、正極集電タブ11は、正極集電端子15の表裏面に25枚ずつ重ねた状態となるように配置し、負極集電タブ12は、負極集電端子16の表裏面に各25枚又は26枚重ねた状態となるように配置した。この後、超音波溶接装置(接合装置)のアンビルを、積層電極体群作製冶具60の超音波溶接装置用貫通孔64及びスペーサ30の超音波溶接装置用貫通孔32b、33bから挿入して、正極集電タブ11を正極集電端子15に、負極集電タブ12を負極集電端子16に各々押圧した状態で、両集電端子15、16の一方の面に両集電タブ11,12を超音波溶接した。しかる後、両集電端子15、16の他方の面に両集電タブ11,12を超音波溶接し、更に、移動規制用突起部31と外向き移動規制用突起部32a、33aとの上面に接着剤を塗布した後、位置合わせ用突起32c、33cに各々位置合わせ用貫通孔42c、43cを挿通し、図11に示すように、スペーサ30とスペーサ40とを接着して積層電極体群70を作製した。   Next, as shown in FIGS. 12 and 13, the spacer 30 and the laminated electrode body 10 are disposed in the first recess 61 of the laminated electrode body group fabrication jig 60, and the alignment protrusions 32 c and 33 c are respectively used for alignment. The positive electrode current collector terminal 15 and the negative electrode current collector terminal 16 were respectively disposed in the second recesses 62 and 63 while being inserted through the through holes 15a and 16a. At this time, the positive electrode current collecting tabs 11 are arranged so that 25 sheets are stacked on the front and back surfaces of the positive electrode current collecting terminals 15, and the negative electrode current collecting tabs 12 are arranged on the front and back surfaces of the negative electrode current collecting terminals 16. It arrange | positioned so that it might be in the state which piled up 26 sheets. Thereafter, the anvil of the ultrasonic welding device (joining device) is inserted from the through hole 64 for the ultrasonic welding device of the multilayer electrode body group production jig 60 and the through holes 32b and 33b for the ultrasonic welding device of the spacer 30, In a state where the positive current collecting tab 11 is pressed against the positive current collecting terminal 15 and the negative current collecting tab 12 is pressed against the negative current collecting terminal 16, both current collecting tabs 11, 12 are placed on one surface of both current collecting terminals 15, 16. Were ultrasonically welded. Thereafter, the current collecting tabs 11 and 12 are ultrasonically welded to the other surfaces of the current collecting terminals 15 and 16, and the upper surfaces of the movement restricting protrusion 31 and the outward movement restricting protrusions 32a and 33a. After the adhesive is applied, the alignment through holes 42c and 43c are inserted into the alignment protrusions 32c and 33c, respectively, and the spacer 30 and the spacer 40 are bonded to each other as shown in FIG. 70 was produced.

この後、ラミネート外装体25の収納空間内に積層電極体群70を配置した後、正極集電端子15と負極集電端子16とがラミネートフィルム28から突出した状態で、両集電端子15、16が存在する辺のラミネートフィルム28同士を溶着した。その後、ラミネートフィルム28の残り3辺のうち2辺を溶着することにより積層電極体群70をラミネート外装体25内に配置した。最後に、ラミネート外装体25の開口部から非水電解液を注液した後、ラミネート外装体25の内圧が30torr以下となるように規制した状態で、ラミネート外装体25の開口部(ラミネートフィルムの残りの1辺)を溶着することにより積層式電池を作製した。尚、上記非水電解液としては、エチレンカーボネート(EC)とメチルエチルカーボネート(MEC)とが体積比で30:70の割合で混合された混合溶媒に、LiPF6が1M(モル/リットル)の割合で溶解されたものを使用した。 Thereafter, after the laminated electrode body group 70 is disposed in the storage space of the laminate outer package 25, both the current collecting terminals 15, with the positive electrode current collecting terminal 15 and the negative electrode current collecting terminal 16 projecting from the laminate film 28, Laminate films 28 on the side where 16 is present were welded together. Then, the laminated electrode body group 70 was disposed in the laminate outer package 25 by welding two of the remaining three sides of the laminate film 28. Finally, after injecting a non-aqueous electrolyte from the opening of the laminate outer package 25, in the state where the internal pressure of the laminate outer package 25 is regulated to be 30 torr or less, the opening of the laminate outer package 25 (of the laminate film) A stacked battery was prepared by welding the remaining one side). As the non-aqueous electrolyte, a mixed solvent in which ethylene carbonate (EC) and methyl ethyl carbonate (MEC) are mixed at a volume ratio of 30:70, LiPF 6 is 1 M (mol / liter). What was melt | dissolved in the ratio was used.

(その他の事項)
(1)上記実施例では、スペーサ40には超音波溶接装置用貫通孔を設けていないが、図14に示すように、超音波溶接装置用貫通孔42b、43bを設けるような構造であっても良い。このような構造であれば、両集電端子15、16の両面に両集電タブ11、12を1度で超音波溶接できるという効果がある。
(Other matters)
(1) In the above embodiment, the spacer 40 is not provided with through holes for ultrasonic welding equipment, but as shown in FIG. 14, it has a structure in which through holes 42b and 43b for ultrasonic welding equipment are provided. Also good. With such a structure, there is an effect that both current collecting tabs 11 and 12 can be ultrasonically welded to both surfaces of both current collecting terminals 15 and 16 at a time.

(2)上記実施例では2枚のラミネートフィルム28の両者に収納空間を構成する収納凹部を設けているが、このような構造に限定するものではなく、図15に示すように、一方のラミネートフィルム28aにのみ収納空間を構成する収納凹部を設け、他方のラミネートフィルム28bには収納空間を構成する収納凹部を設けないような構造であっても良い。この場合には、両集電タブ11、12と両集電端子15、16との各溶着部は両集電端子15、16の一方の面にのみ形成されるので、図16に示すように、スペーサ30としては高さが大きなものを1つだけ用いれば良い。また、この場合に用いる積層電極体群作製冶具60は、図17に示すように、第1凹部61が深底形状(積層電極体10の厚みと略同等)となっているのが望ましい。尚、図15における符号39は樹脂製のシートである。
また、必ずしも2枚のラミネートフィルム28を用いる必要はなく、1枚のラミネートフィルム28を折り返してラミネート外装体25を構成しても良い。
(2) In the above-described embodiment, the storage concave portion constituting the storage space is provided in both of the two laminate films 28. However, the present invention is not limited to such a structure, and as shown in FIG. It is also possible to provide a structure in which a storage recess that forms the storage space is provided only in the film 28a, and no storage recess that forms the storage space is provided in the other laminate film 28b. In this case, since the welded portions between the current collecting tabs 11 and 12 and the current collecting terminals 15 and 16 are formed only on one surface of the current collecting terminals 15 and 16, as shown in FIG. As the spacer 30, only one spacer having a large height may be used. Moreover, as for the laminated electrode body group preparation jig 60 used in this case, as shown in FIG. 17, it is desirable for the 1st recessed part 61 to have a deep bottom shape (substantially equivalent to the thickness of the laminated electrode body 10). In addition, the code | symbol 39 in FIG. 15 is a resin-made sheet | seat.
Further, it is not always necessary to use two laminated films 28, and the laminated outer package 25 may be configured by folding back one laminated film 28.

(3)上記実施例では、スペーサ30にR部32d、33dが形成されているが、このような構造に限定するものではなく、図18に示すように、スペーサ30にR部32d、33dが形成されていないような構造であっても良い。 (3) In the above embodiment, the R portions 32d and 33d are formed on the spacer 30, but the present invention is not limited to such a structure. As shown in FIG. 18, the spacer 30 has R portions 32d and 33d. A structure that is not formed may be used.

(4)図19に示すように、スペーサ30の積層電極体10方向に開口する電解液貯留孔80を形成するような構成とすれば、電解液貯留孔80に貯留された電解液を積層電極体10に供給することができる。したがって、電池内の電解液量が不足するという問題が緩和されるので、ハイレートでの充放電を行なった場合であっても放電時における電池容量の低下とサイクル特性の低下とを抑制することができる。 (4) As shown in FIG. 19, if the electrolyte solution storage hole 80 that opens in the direction of the stacked electrode body 10 of the spacer 30 is formed, the electrolyte solution stored in the electrolyte solution storage hole 80 is used as the stacked electrode. The body 10 can be supplied. Therefore, since the problem that the amount of electrolyte in the battery is insufficient is alleviated, it is possible to suppress a decrease in battery capacity and a decrease in cycle characteristics during discharge even when charging / discharging at a high rate. it can.

(5)上記実施例ではスペーサ30とスペーサ40との固定を接着剤にて行なったが、このような構造に限定するものではなく、スペーサ40の位置合わせ用貫通孔42c、43cにスペーサ30の位置合わせ用突起32c、33cを嵌合することにより、スペーサ30とスペーサ40とを固定することも可能である。 (5) In the above embodiment, the spacer 30 and the spacer 40 are fixed with an adhesive. However, the present invention is not limited to such a structure, and the spacer 30 is positioned in the alignment through holes 42c and 43c. It is also possible to fix the spacer 30 and the spacer 40 by fitting the alignment protrusions 32c and 33c.

(6)正極活物質としては、上記LiCoO2に限定するものではなく、LiNiO2、LiMnO4或いはこれらの複合体等であっても良く、負極活物質としては上記天然黒鉛に限定するものではなく、人造黒鉛、Si等であっても良い。 (6) The positive electrode active material is not limited to the above LiCoO 2 , but may be LiNiO 2 , LiMnO 4, or a composite thereof, and the negative electrode active material is not limited to the above natural graphite. , Artificial graphite, Si, or the like.

(7)上記実施例では、全ての負極板2につき、負極用導電性芯体の両面に負極活物質層2aを形成したが、正極板と対向していない部位の負極活物質層(具体的には、最外に配置された負極板の外側に存在する負極活物質層)はなくても良い。そして、このような構造とすれば、積層電極体10の厚みが小さくなるので、電池の高容量密度化を達成できる。 (7) In the above embodiment, the negative electrode active material layers 2a are formed on both surfaces of the negative electrode conductive core for all the negative electrode plates 2, but the negative electrode active material layers (specifically, not facing the positive electrode plate) May not have a negative electrode active material layer) present on the outer side of the outermost negative electrode plate. And if it is such a structure, since the thickness of the laminated electrode body 10 becomes small, the high capacity density of a battery can be achieved.

本発明は、例えば、ロボット、電気自動車およびバックアップ電源等に用いる電池に適用することができる。   The present invention can be applied to, for example, a battery used for a robot, an electric vehicle, a backup power source, and the like.

本発明の積層式電池に用いる積層電極体の分解斜視図である。It is a disassembled perspective view of the laminated electrode body used for the laminated battery of this invention. 本発明の積層式電池の斜視図である。It is a perspective view of the laminated battery of the present invention. 本発明の積層式電池の一部を示す図であって、同図(a)は正極の平面図、同図(b)はセパレータの斜視図、同図(c)は正極が内部に配置された袋状セパレータを示す平面図である。It is a figure which shows a part of laminated battery of this invention, Comprising: The figure (a) is a top view of a positive electrode, The figure (b) is a perspective view of a separator, The figure (c) is a positive electrode arrange | positioned inside. It is a top view which shows the bag-shaped separator. 本発明の積層式電池に用いる負極の平面図である。It is a top view of the negative electrode used for the laminated battery of this invention. 本発明の積層式電池に用いる積層電極体の斜視図である。It is a perspective view of the laminated electrode body used for the laminated battery of this invention. 本発明の積層式電池を正面から視たときの説明図である。It is explanatory drawing when the laminated battery of this invention is seen from the front. 図2のA‐A線矢視断面図である。FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. 本発明の積層式電池に用いる一方のスペーサの斜視図である。It is a perspective view of one spacer used for the laminated battery of the present invention. 本発明の積層式電池に用いる一方のスペーサを示す図であって、同図(a)は正面図、同図(b)は平面図、同図(c)は側面図である。It is a figure which shows one spacer used for the laminated battery of this invention, Comprising: The figure (a) is a front view, The figure (b) is a top view, The figure (c) is a side view. 本発明の積層式電池に用いる他方のスペーサの斜視図である。It is a perspective view of the other spacer used for the laminated battery of this invention. 本発明の積層式電池に用いる積層電極体群を示す斜視図である。It is a perspective view which shows the laminated electrode body group used for the laminated battery of this invention. 積層電極体群作製冶具を用いて本発明の積層式電池を製造する方法を示す説明図である。It is explanatory drawing which shows the method of manufacturing the laminated battery of this invention using a laminated electrode body group preparation jig. 積層電極体群作製冶具を用いて本発明の積層式電池を製造する方法を示す説明図である。It is explanatory drawing which shows the method of manufacturing the laminated battery of this invention using a laminated electrode body group preparation jig. 本発明の積層式電池に用いる他方のスペーサの変形例を示す斜視図である。It is a perspective view which shows the modification of the other spacer used for the laminated battery of this invention. 本発明の積層式電池の変形例を示す断面図である。It is sectional drawing which shows the modification of the laminated battery of this invention. 本発明の積層式電池に用いる一方のスペーサの変形例を示す斜視図である。It is a perspective view which shows the modification of one spacer used for the laminated battery of this invention. 積層電極体群作製冶具を用いて本発明の変形例に係る積層式電池を製造する方法を示す説明図である。It is explanatory drawing which shows the method of manufacturing the laminated battery which concerns on the modification of this invention using a laminated electrode body group production jig. 本発明の積層式電池に用いる一方のスペーサの変形例を示す斜視図である。It is a perspective view which shows the modification of one spacer used for the laminated battery of this invention. 本発明の積層式電池に用いる一方のスペーサの変形例を示す斜視図である。It is a perspective view which shows the modification of one spacer used for the laminated battery of this invention.

符号の説明Explanation of symbols

1:正極板
2:負極板
3:セパレータ
4:セパレータ溶着部
10:積層電極体
11:正極集電タブ
12:負極集電タブ
15:正極集電端子
16:負極集電端子
15a、16a:位置合わせ用貫通孔
25:ラミネート外装体
27:ラミネート封止部
28:ラミネートフィルム
30:スペーサ
31:移動規制用突起部
32a、33a:外向き移動規制用突起部
32b、33b:超音波溶接装置用貫通孔
32c、33c:位置合わせ用突起
42c、43c:位置合わせ用貫通孔
60:積層電極体群作製冶具
61:第1凹部
62、63:第2凹部
64:超音波溶接装置用貫通孔
DESCRIPTION OF SYMBOLS 1: Positive electrode plate 2: Negative electrode plate 3: Separator 4: Separator welding part 10: Laminated electrode body 11: Positive electrode current collection tab 12: Negative electrode current collection tab 15: Positive electrode current collection terminal 16: Negative electrode current collection terminal 15a, 16a: Position Through-hole for alignment 25: Laminate exterior body 27: Laminate sealing part 28: Laminate film 30: Spacer 31: Protrusion part for movement restriction 32a, 33a: Protrusion part for outward movement restriction 32b, 33b: Through hole for ultrasonic welding apparatus Holes 32c, 33c: Positioning protrusions 42c, 43c: Positioning through holes 60: Laminated electrode body group fabrication jig 61: First recessed part 62, 63: Second recessed part 64: Through hole for ultrasonic welding apparatus

Claims (6)

各々正極集電タブが延出された複数の正極板と、各々負極集電タブが延出された複数の負極板とが、セパレータを介して交互に積層された積層電極体を有し、且つ、この積層電極体が電解液と共に、金属層と樹脂層とを備えたラミネートフィルムの周縁同士を溶着することにより形成されたラミネート外装体の収納空間内に配置され、しかも、上記正極集電タブは重畳状態で正極集電端子に接合され、上記負極集電タブは重畳状態で負極集電端子に接合され、これら両集電端子がラミネート外装体から突出する積層式電池であって、
上記両集電端子が突出する部位に存在するラミネート外装体の内側面と上記積層電極体との間に存在する空間内には、上記積層電極体の幅と略同一の長さであって両端が上記積層電極体の両側面と略同位置に存在するスペーサが配置されており、且つ、上記両集電端子には位置合わせ用貫通孔が形成される一方、上記スペーサにおける上記位置合わせ用貫通孔に対応する位置には、当該貫通孔に嵌る位置合わせ用突起が設けられ
上記スペーサにおける上記両集電端子間に対応する位置には、両集電端子の内向き移動を規制する内向き移動規制用突起が設けられていることを特徴とする積層式電池。
A plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab each having a laminated electrode body laminated alternately via separators; and The laminated electrode body is disposed in a storage space of a laminate outer body formed by welding together peripheral edges of a laminate film having a metal layer and a resin layer together with an electrolyte, and the positive electrode current collecting tab Is a laminated battery that is joined to the positive current collector terminal in a superimposed state, the negative current collector tab is joined to the negative current collector terminal in a superimposed state, and both the current collector terminals protrude from the laminate outer package,
In the space existing between the inner surface of the laminate outer package and the laminated electrode body present at the portion where the current collector terminals protrude, the both ends of the laminated electrode body are substantially the same length as the width of the laminated electrode body. Are disposed at substantially the same position as both side surfaces of the multilayer electrode body, and the through holes for alignment are formed in the current collecting terminals, while the alignment through holes in the spacer are formed. At the position corresponding to the hole, an alignment projection that fits into the through hole is provided ,
An inward movement restricting projection for restricting inward movement of both current collecting terminals is provided at a position corresponding to between the two current collecting terminals in the spacer .
上記スペーサにおける上記両集電端子との接触位置より外方側には、両集電端子の外向き移動を規制する外向き移動規制用突起が設けられている、請求項1に記載の積層式電池。 2. The stacked type according to claim 1, wherein an outward movement restricting projection for restricting outward movement of both the current collecting terminals is provided on an outer side of the contact position of the spacer with the two current collecting terminals. battery. 上記正極集電端子の両面に上記正極集電タブが重ねられた状態で両者が接合される一方、上記負極集電端子の両面に上記負極集電タブが重ねられた状態で両者が接合され、且つ、上記両集電端子の両面にスペーサがそれぞれ配置されており、しかも、一方のスペーサには上記位置合わせ用突起が設けられ、他方のスペーサには上記位置合わせ用突起が嵌る位置合わせ用孔が設けられている、請求項1又は2に記載の積層式電池。 Both are joined in a state where the positive current collecting tab is superimposed on both surfaces of the positive current collecting terminal, while both are joined in a state where the negative current collecting tab is superimposed on both sides of the negative current collecting terminal, In addition, spacers are arranged on both surfaces of the current collecting terminals, and the alignment protrusion is provided in one spacer, and the alignment protrusion is fitted in the other spacer. The stacked battery according to claim 1 or 2 , wherein the battery is provided. 上記正極集電端子の一方の面にのみ上記正極集電タブが重ねられた状態で両者が接合される一方、上記負極集電端子の一方の面にのみ上記負極集電タブが重ねられた状態で両者が接合され、且つ、上記両集電端子における接合部位が存在する面にのみ上記スペーサが配置されている、請求項1又は2に記載の積層式電池。 A state in which the positive electrode current collector tab is overlapped only on one surface of the positive electrode current collector terminal and the both are joined, while a state in which the negative electrode current collector tab is overlapped only on one surface of the negative electrode current collector terminal in both are bonded, and said spacer only on the surface bonding sites in the both current collector terminal is present is arranged, stack type battery according to claim 1 or 2. 各々正極集電タブが延出された複数の正極板と、各々負極集電タブが延出された複数の負極板とが、セパレータを介して交互に積層された積層電極体、上記正極集電タブが重畳状態で接合される正極集電端子、上記負極集電タブが重畳状態で接合される負極集電端子、及び、両集電タブの接合部位近傍に配置される絶縁性のスペーサ、を一体化して積層電極体群を作製するための積層電極体群作製冶具であって、
上記積層電極体の両集電タブが延出された部位に上記スペーサが配置された形状と略同形状を成す第1凹部と、上記正極集電端子及び上記負極集電端子と略同形状を成す2つの第2凹部とが形成され、且つ、上記正極集電タブと上記正極集電端子との接合部位及び上記負極集電タブと上記負極集電端子との接合部位にそれぞれ対応する部位には、接合装置を挿入するための接合装置用貫通孔が形成されていることを特徴とする積層電極体群作製冶具。
A laminated electrode body in which a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab are alternately laminated via a separator, the positive electrode current collector A positive current collecting terminal to which the tab is joined in an overlapping state, a negative current collecting terminal to which the negative current collecting tab is joined in an overlapping state, and an insulating spacer disposed in the vicinity of the joining portion of both current collecting tabs, It is a laminated electrode body group making jig for producing a laminated electrode body group integrally,
A first recess having substantially the same shape as the spacer disposed at a portion where both current collecting tabs of the laminated electrode body are extended, and substantially the same shape as the positive current collecting terminal and the negative current collecting terminal. Two second recesses are formed, and the portions corresponding to the joint portion between the positive current collector tab and the positive current collector terminal and the joint portion between the negative current collector tab and the negative current collector terminal, respectively. Is a bonding electrode through-hole for forming a bonding apparatus for inserting the bonding apparatus.
各々正極集電タブが延出された複数の正極板と、各々負極集電タブが延出された複数の負極板とが、セパレータを介して交互に積層された積層電極体、上記正極集電タブが重畳状態で接合される正極集電端子、上記負極集電タブが重畳状態で接合される負極集電端子、及び、両集電タブの接合部位近傍に配置される絶縁性のスペーサ、を一体化して積層電極体群を作製するための積層電極体群作製冶具であって、
上記積層電極体の両集電タブが延出された部位に上記スペーサが配置された形状と略同形状を成す第1凹部と、上記正極集電端子及び上記負極集電端子と略同形状を成す2つの第2凹部とが形成され、且つ、上記正極集電タブと上記正極集電端子との接合部位及び上記負極集電タブと上記負極集電端子との接合部位にそれぞれ対応する部位には、接合装置を挿入するための接合装置用貫通孔が形成されている積層電極体群作製冶具を用いた、以下のステップを有することを特徴とする積層式電池の製造方法、即ち
正極集電タブが延出された複数の正極板と、負極集電タブが延出された複数の負極板とを、セパレータを介して交互に積層して板状の積層電極体を作製する積層電極体作製ステップと、
接合装置を挿入するための接合装置用貫通孔が形成されスペーサと上記積層電極体とを上記第1凹部に載置すると共に、正極集電端子と負極集電端子とをそれぞれ第2凹部に載置した後、上記積層電極体群作製冶具及び上記スペーサに形成された接合装置用貫通孔に接合装置を挿入することにより、重畳状態の上記正極集電タブと上記正極集電端子とを接合すると共に、重畳状態の上記負極集電タブと上記負極集電端子とを接合して、積層電極体群を作製する積層電極体群作製ステップと、
ラミネートフィルムの収納凹部内に上記積層電極体群を配置した後、一部を残して上記ラミネートフィルムの周縁同士を溶着する溶着ステップと、
上記ラミネートフィルムで構成されたラミネート外装体の開口部から電解液を注液する注液ステップと、
上記ラミネート外装体の内部の減圧状態を維持しつつ、ラミネート外装体の開口部を封止する封止ステップと、
を有することを特徴とする積層電極体群作製冶具を用いた積層式電池の製造方法。
A laminated electrode body in which a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab are alternately laminated via a separator, the positive electrode current collector A positive current collecting terminal to which the tab is joined in an overlapping state, a negative current collecting terminal to which the negative current collecting tab is joined in an overlapping state, and an insulating spacer disposed in the vicinity of the joining portion of both current collecting tabs, It is a laminated electrode body group making jig for producing a laminated electrode body group integrally,
A first recess having substantially the same shape as the spacer disposed at a portion where both current collecting tabs of the laminated electrode body are extended, and substantially the same shape as the positive current collecting terminal and the negative current collecting terminal. Two second recesses are formed, and the portions corresponding to the joint portion between the positive current collector tab and the positive current collector terminal and the joint portion between the negative current collector tab and the negative current collector terminal, respectively. to a method for manufacturing a stack type battery, characterized in that it comprises using a laminated electrode body group making jig joining device through hole is formed for inserting the joining device, the following steps, namely,
Lamination for producing a plate-shaped laminated electrode body by alternately laminating a plurality of positive electrode plates with a positive current collector tab extended and a plurality of negative electrode plates with a negative electrode current collector tab extended through a separator An electrode body manufacturing step;
A joining device through-hole for inserting the joining device is formed, and the spacer and the laminated electrode body are placed in the first recess, and the positive current collecting terminal and the negative current collecting terminal are placed in the second recessed portion, respectively. Then, the superposed positive electrode current collecting tab and the positive electrode current collecting terminal are joined by inserting a joining device into a through hole for the joining device formed in the laminated electrode body group fabrication jig and the spacer. In addition, a laminated electrode body group production step of producing a laminated electrode body group by joining the negative electrode current collecting tab and the negative electrode current collecting terminal in a superimposed state,
After arranging the laminated electrode body group in the storage recess of the laminate film, a welding step of welding the peripheral edges of the laminate film leaving a part,
A liquid injection step of injecting an electrolytic solution from the opening of the laminate outer body constituted by the laminate film;
A sealing step for sealing the opening of the laminate exterior body while maintaining the reduced pressure state inside the laminate exterior body,
A method for producing a laminated battery using a laminated electrode body group production jig characterized by comprising:
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