JP5371563B2 - Power storage device - Google Patents

Power storage device Download PDF

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JP5371563B2
JP5371563B2 JP2009139864A JP2009139864A JP5371563B2 JP 5371563 B2 JP5371563 B2 JP 5371563B2 JP 2009139864 A JP2009139864 A JP 2009139864A JP 2009139864 A JP2009139864 A JP 2009139864A JP 5371563 B2 JP5371563 B2 JP 5371563B2
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current collector
collector foil
storage device
exposed portion
power storage
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JP2010287703A (en
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昭 白神
大吾 竹村
茂 相原
万希子 吉瀬
省二 吉岡
秀一 松本
憲朗 光田
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Mitsubishi Electric Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Electric Double-Layer Capacitors Or The Like (AREA)
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  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power storage device that can suppress a decrease in energy efficiency, can improve reliability, and can be made compact. <P>SOLUTION: The power storage device 1 includes a power storage device body 2, and an exterior film 3 which contains the power storage device body 2 in a state where the power storage device body 2 is dipped in an electrolyte. The power storage device body 2 has first and second electrode sheets 4 and 5, and a separator 6 held between the first and second electrode sheets 4 and 5. The first electrode sheet 4 has: a first current collecting foil 7; and a first electrode 8 provided to the first current collecting foil 7 while avoiding a first current collecting foil-exposed part 7a as a portion of the first current collecting foil 7. The second electrode sheet 5 has: a second current collecting foil 9; and a second electrode 10 provided to the second current collecting foil 9 while avoiding a second current collecting foil-exposed part 9a as a portion of the second current collecting foil 9. The first and second current collecting foil exposed parts 7a and 9a are exposed as terminals to the outside of the exterior film 3. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

この発明は、例えば電池やキャパシタ等、電力を蓄える蓄電デバイスに関するものである。   The present invention relates to a power storage device that stores electric power, such as a battery or a capacitor.

従来、セパレータを正電極部及び負電極部で挟むことにより構成された積層体と、電解液に浸した状態で積層体を収容する外装材とを有する蓄電素子が知られている。積層体には、一対の板状端子が取り付けられている。各板状端子は、外装材内で溶接により積層体に接合されている。各板状端子の一部は、外装材外に露出されている（例えば特許文献１参照）。   2. Description of the Related Art Conventionally, a power storage element is known that includes a laminated body that is configured by sandwiching a separator between a positive electrode portion and a negative electrode portion, and an exterior material that houses the laminated body in a state of being immersed in an electrolytic solution. A pair of plate terminals are attached to the laminate. Each plate-like terminal is joined to the laminate by welding in the exterior material. A part of each plate-like terminal is exposed outside the exterior material (see, for example, Patent Document 1).

また、従来、リードが接続された電池要素と、リードの一部を外部に露出させて電池要素を密封する外装フィルムとを有するフィルム外装電気デバイスも知られている。リードは、外装フィルム内で電池要素に超音波溶接により接合されている（例えば特許文献２参照）。   Conventionally, a film-covered electrical device having a battery element to which a lead is connected and an exterior film that seals the battery element by exposing a part of the lead to the outside is also known. The lead is joined to the battery element by ultrasonic welding in the exterior film (see, for example, Patent Document 2).

特開２００７−３３５１５０号公報JP 2007-335150 A ＷＯ２００５／０９１３９８WO2005 / 091398

しかし、特許文献１に示されている蓄電素子では、各板状端子と積層体とが外装材内で溶接により接合されているので、例えば溶接による接合が不十分であったり不均一であったりして溶接の状態に不具合が生じている場合には、接合部分で電気抵抗が増大したり、正電極部及び負電極部での発電反応の分布に偏りが生じたりしてしまうことがある。従って、蓄電素子のエネルギ効率が低下してしまうとともに、蓄電素子の信頼性も低下してしまう。また、外装材内に溶接部分が存在しているので、溶接部分を設けるスペースを外装材内に確保しなければならず、蓄電素子が大形化してしまう。   However, in the electric storage element shown in Patent Document 1, each plate-like terminal and the laminated body are joined by welding in the exterior material, so that, for example, the joining by welding is insufficient or uneven. If there is a problem in the welding state, the electrical resistance may increase at the joint portion, or the distribution of power generation reaction at the positive electrode portion and the negative electrode portion may be biased. Therefore, the energy efficiency of the power storage element is lowered, and the reliability of the power storage element is also lowered. In addition, since a welded portion exists in the exterior material, a space for providing the welded portion must be secured in the exterior material, and the power storage element is increased in size.

また、特許文献２に示されているフィルム外装電気デバイスでも、リードと電池要素とが外装フィルム内で超音波溶接により接合されているので、特許文献１の蓄電素子と同様に、エネルギ効率の低下や信頼性の低下、大形化の問題が生じる。   Further, even in the film-clad electrical device shown in Patent Document 2, since the lead and the battery element are joined by ultrasonic welding in the exterior film, the energy efficiency decreases as in the power storage element of Patent Document 1. In addition, problems such as a decrease in reliability and an increase in size occur.

この発明は、上記のような課題を解決するためになされたものであり、エネルギ効率の低下を抑制することができるとともに信頼性の向上を図ることができ、小形化を図ることができる蓄電デバイスを得ることを目的とする。   The present invention has been made in order to solve the above-described problems, and is an electric storage device that can suppress a decrease in energy efficiency, improve reliability, and can be miniaturized. The purpose is to obtain.

この発明に係る蓄電デバイスは、第１の集電箔と第１の集電箔の一部である第１の集電箔露出部を避けて第１の集電箔に設けられた第１の電極とを含む第１の電極形成体と、第２の集電箔と第２の集電箔の一部である第２の集電箔露出部を避けて第２の集電箔に設けられた第２の電極とを含む第２の電極形成体と、第１及び第２の電極間に挟まれ、第１及び第２の電極間の短絡を防止するセパレータとを有する蓄電デバイス本体、及び蓄電デバイス本体を電解液に浸した状態で収容する外装材を備え、第１及び第２の集電箔露出部は、外装材外へ端子として露出している。   The electricity storage device according to the present invention includes a first current collector foil and a first current collector foil provided on the first current collector foil so as to avoid the exposed portion of the first current collector foil that is a part of the first current collector foil. A first electrode forming body including an electrode, a second current collecting foil, and a second current collecting foil that is a part of the second current collecting foil, and is provided on the second current collecting foil. A power storage device body comprising: a second electrode forming body including a second electrode; and a separator sandwiched between the first and second electrodes to prevent a short circuit between the first and second electrodes; An exterior material that accommodates the power storage device main body in a state of being immersed in an electrolytic solution is provided, and the first and second current collector foil exposed portions are exposed as terminals to the exterior of the exterior material.

この発明に係る蓄電デバイスでは、第１の集電箔の一部である第１の集電箔露出部が外装材外へ端子として露出され、第２の集電箔の一部である第２の集電箔露出部が外装材外へ端子として露出されているので、外装材内で積層体と端子とを接合する溶接部分をなくすことができる。従って、蓄電デバイスにおける電気抵抗の増大が抑制されてエネルギ効率の低下を抑制することができ、蓄電デバイスの信頼性の向上も図ることができる。また、外装材内での溶接部分のスペースが不要となるので、蓄電デバイスの小形化を図ることができる。   In the electricity storage device according to the present invention, the first current collector foil exposed portion, which is a part of the first current collector foil, is exposed as a terminal to the outside of the exterior material, and the second current collector foil is a part of the second current collector foil. Since the current collector foil exposed portion is exposed as a terminal to the outside of the exterior material, the welded portion for joining the laminate and the terminal in the exterior material can be eliminated. Accordingly, an increase in electrical resistance in the electricity storage device can be suppressed, and a decrease in energy efficiency can be suppressed, and reliability of the electricity storage device can be improved. Moreover, since the space of the welding part in an exterior material becomes unnecessary, size reduction of an electrical storage device can be achieved.

この発明の実施の形態１による蓄電デバイスの構成を示す断面図である。It is sectional drawing which shows the structure of the electrical storage device by Embodiment 1 of this invention. 図１の蓄電デバイス本体を示す展開図である。It is an expanded view which shows the electrical storage device main body of FIG. 図１の蓄電デバイス本体の要部の構成を示す斜視図である。It is a perspective view which shows the structure of the principal part of the electrical storage device main body of FIG. この発明の実施の形態２による蓄電デバイスの第１の端子の構成を示す要部斜視図である。It is a principal part perspective view which shows the structure of the 1st terminal of the electrical storage device by Embodiment 2 of this invention. 図４の第１の集電箔露出部の一部が切り取られる前の状態を示す斜視図である。It is a perspective view which shows the state before a part of 1st collector foil exposed part of FIG. 4 is cut off. この発明の実施の形態３による蓄電デバイスの第１の端子の構成を示す要部斜視図である。It is a principal part perspective view which shows the structure of the 1st terminal of the electrical storage device by Embodiment 3 of this invention. この発明の実施の形態４による蓄電デバイスの要部の構成を示す斜視図である。It is a perspective view which shows the structure of the principal part of the electrical storage device by Embodiment 4 of this invention. この発明の実施の形態５による蓄電デバイスの要部の構成を示す斜視図である。It is a perspective view which shows the structure of the principal part of the electrical storage device by Embodiment 5 of this invention. この発明の実施の形態６による蓄電デバイスの構成を示す断面図である。It is sectional drawing which shows the structure of the electrical storage device by Embodiment 6 of this invention. 図９の蓄電デバイス本体を示す展開図である。FIG. 10 is a development view showing the power storage device body of FIG. 9.

実施の形態１．
図１は、この発明の実施の形態１による蓄電デバイスの構成を示す断面図である。図において、蓄電デバイス１は、蓄電デバイス本体２と、電解液に浸した状態で蓄電デバイス本体２を収容する外装フィルム（外装材）３とを有している。この例では、蓄電デバイス１は電気二重層キャパシタとされている。 Embodiment 1 FIG.
1 is a cross-sectional view showing a configuration of an electricity storage device according to Embodiment 1 of the present invention. In the figure, the electricity storage device 1 has an electricity storage device body 2 and an exterior film (exterior material) 3 that accommodates the electricity storage device body 2 in a state immersed in an electrolyte. In this example, the electricity storage device 1 is an electric double layer capacitor.

蓄電デバイス本体２は、第１の電極シート（第１の電極形成体）４と、第２の電極シート（第２の電極形成体）５と、第１及び第２の電極シート４，５間に挟まれた紙製のセパレータ６とを有している。   The power storage device body 2 includes a first electrode sheet (first electrode forming body) 4, a second electrode sheet (second electrode forming body) 5, and the first and second electrode sheets 4, 5. And a paper separator 6 sandwiched between the two.

ここで、図２は、図１の蓄電デバイス本体２を示す展開図である。また、図３は、図１の蓄電デバイス本体２の要部の構成を示す斜視図である。蓄電デバイス本体２は、長さ方向を一致させて互いに重ねられた帯状の第１の電極シート４、帯状の第２の電極シート５及び帯状のセパレータ６が第１及び第２の電極シート４，５の長さ方向についてまとめて巻かれることにより扁平状に構成されている。従って、蓄電デバイス本体２は、第１の電極シート４と第２の電極シート５との間にセパレータ６が介在した状態で第１の電極シート４及び第２の電極シート５が繰り返し重なった積層体となっている。   Here, FIG. 2 is a development view showing the electricity storage device body 2 of FIG. FIG. 3 is a perspective view showing a configuration of a main part of the electricity storage device body 2 of FIG. The power storage device body 2 includes a strip-shaped first electrode sheet 4, a strip-shaped second electrode sheet 5, and a strip-shaped separator 6 that are overlapped with each other in the length direction. 5 is formed into a flat shape by being wound together in the length direction. Accordingly, the power storage device body 2 is a laminate in which the first electrode sheet 4 and the second electrode sheet 5 are repeatedly overlapped with the separator 6 interposed between the first electrode sheet 4 and the second electrode sheet 5. It is a body.

第１の電極シート４は、帯状の第１の集電箔７と、第１の集電箔７の両面に設けられた第１の電極８とを有している。この例では、第１の集電箔７がアルミニウム製の金属箔とされ、第１の電極８が活性炭素電極とされている。   The first electrode sheet 4 includes a strip-shaped first current collector foil 7 and first electrodes 8 provided on both surfaces of the first current collector foil 7. In this example, the first current collector foil 7 is an aluminum metal foil, and the first electrode 8 is an activated carbon electrode.

第１の電極８は、電極材料が第１の集電箔７に塗布されることにより第１の集電箔７の長さ方向に沿って形成されている。また、第１の電極８は、第１の集電箔７の一方の縁部（一部）である第１の集電箔露出部７ａを避けて第１の集電箔７に設けられている。従って、第１の集電箔露出部７ａは、第１の集電箔７がそのまま露出された部分となっている。また、第１の集電箔露出部７ａは、第１の集電箔７の長さ方向に沿って延びている。   The first electrode 8 is formed along the length direction of the first current collector foil 7 by applying an electrode material to the first current collector foil 7. Further, the first electrode 8 is provided on the first current collector foil 7 while avoiding the first current collector foil exposed portion 7 a which is one edge (part) of the first current collector foil 7. Yes. Accordingly, the first current collector foil exposed portion 7a is a portion where the first current collector foil 7 is exposed as it is. The first current collector foil exposed portion 7 a extends along the length direction of the first current collector foil 7.

第２の電極シート５は、帯状の第２の集電箔９と、第２の集電箔９の両面に設けられた第２の電極１０とを有している。この例では、第２の集電箔９がアルミニウム製の金属箔とされ、第２の電極１０が活性炭素電極とされている。   The second electrode sheet 5 has a strip-shaped second current collector foil 9 and second electrodes 10 provided on both surfaces of the second current collector foil 9. In this example, the second current collector foil 9 is an aluminum metal foil, and the second electrode 10 is an activated carbon electrode.

第２の電極１０は、電極材料が第２の集電箔９に塗布されることにより第２の集電箔９の長さ方向に沿って形成されている。また、第２の電極１０は、第２の集電箔９の一方の縁部（一部）である第２の集電箔露出部９ａを避けて第２の集電箔９に設けられている。従って、第２の集電箔露出部９ａは、第２の集電箔９がそのまま露出された部分となっている。また、第２の集電箔露出部９ａは、第２の集電箔９の長さ方向に沿って延びている。   The second electrode 10 is formed along the length direction of the second current collector foil 9 by applying an electrode material to the second current collector foil 9. Further, the second electrode 10 is provided on the second current collector foil 9 while avoiding the second current collector foil exposed portion 9a which is one edge (part) of the second current collector foil 9. Yes. Accordingly, the second current collector foil exposed portion 9a is a portion where the second current collector foil 9 is exposed as it is. The second current collector foil exposed portion 9 a extends along the length direction of the second current collector foil 9.

第１の電極シート４及び第２の電極シート５は、第１及び第２の電極８，１０の位置を互いに合わせて重ねられている。また、第１の電極シート４及び第２の電極シート５は、第１及び第２の集電箔露出部７ａ，９ａを互いに反対方向へ突出させて交互に重ねられている。これにより、第１及び第２の集電箔露出部７ａ，９ａは、互いに接触することはなく、互いに離れた状態を保っている。   The first electrode sheet 4 and the second electrode sheet 5 are stacked with the positions of the first and second electrodes 8 and 10 aligned with each other. The first electrode sheet 4 and the second electrode sheet 5 are alternately stacked with the first and second current collector foil exposed portions 7a and 9a protruding in opposite directions. Thereby, the 1st and 2nd collector foil exposed parts 7a and 9a are not contacting each other, but are maintaining the state which mutually separated.

セパレータ６は、第１及び第２の電極８，１０間に挟まれている。これにより、第１の電極８と第２の電極１０との接触が防止され、第１及び第２の電極８，１０間の短絡が防止される。   The separator 6 is sandwiched between the first and second electrodes 8 and 10. Thereby, the contact with the 1st electrode 8 and the 2nd electrode 10 is prevented, and the short circuit between the 1st and 2nd electrodes 8 and 10 is prevented.

第１の集電箔露出部７ａには、変性ポリプロピレン製の第１の密閉用樹脂１１が設けられている。第１の集電箔露出部７ａは、第１の電極シート４が第１の集電箔７の長さ方向について巻かれることにより互いに重なっている。互いに重なる第１の集電箔露出部７ａ間は、第１の密閉用樹脂１１による熱融着により固定されて密閉されている。   The first current collector foil exposed portion 7a is provided with a first sealing resin 11 made of modified polypropylene. The first current collector foil exposed portions 7 a overlap each other when the first electrode sheet 4 is wound in the length direction of the first current collector foil 7. A space between the first current collector foil exposed portions 7a that overlap each other is fixed and sealed by thermal fusion using the first sealing resin 11.

第１の密閉用樹脂１１は、第１の集電箔７の幅方向（第１の集電箔７の長さ方向に対して垂直な方向）について第１の集電箔露出部７ａの中間部（所定の部分）に配置されている。第１の集電箔露出部７ａにおける第１の密閉用樹脂１１の位置よりも外側の部分は、蓄電デバイス１の第１の端子とされている。即ち、第１の集電箔露出部７ａの一部が蓄電デバイス１の第１の端子とされている。   The first sealing resin 11 is in the middle of the first current collector foil exposed portion 7a in the width direction of the first current collector foil 7 (direction perpendicular to the length direction of the first current collector foil 7). It is arranged in the part (predetermined part). A portion outside the position of the first sealing resin 11 in the first current collector foil exposed portion 7 a is a first terminal of the electricity storage device 1. That is, a part of the first current collector foil exposed portion 7 a is the first terminal of the electricity storage device 1.

第２の集電箔露出部９ａには、変性ポリプロピレン製の第２の密閉用樹脂１２が設けられている。第２の集電箔露出部９ａは、第２の電極シート５が第２の集電箔９の長さ方向について巻かれることにより互いに重なっている。互いに重なる第２の集電箔露出部９ａ間は、第２の密閉用樹脂１２による熱融着により固定されて密閉されている。   The second current collecting foil exposed portion 9a is provided with a second sealing resin 12 made of modified polypropylene. The second current collector foil exposed portions 9 a overlap each other when the second electrode sheet 5 is wound in the length direction of the second current collector foil 9. A space between the second current collector foil exposed portions 9a overlapping each other is fixed and sealed by heat fusion using the second sealing resin 12.

第２の密閉用樹脂１２は、第２の集電箔９の幅方向（第２の集電箔９の長さ方向に対して垂直な方向）について第２の集電箔露出部９ａの中間部（所定の部分）に配置されている。第２の集電箔露出部９ａにおける第２の密閉用樹脂１２の位置よりも外側の部分は、蓄電デバイス１の第２の端子とされている。即ち、第２の集電箔露出部９ａの一部が蓄電デバイス１の第２の端子とされている。蓄電デバイス１に対する充電及び放電は、第１及び第２の端子を通して行われる。   The second sealing resin 12 is in the middle of the second current collector foil exposed portion 9a in the width direction of the second current collector foil 9 (direction perpendicular to the length direction of the second current collector foil 9). It is arranged in the part (predetermined part). The portion outside the position of the second sealing resin 12 in the second current collector foil exposed portion 9 a is the second terminal of the electricity storage device 1. That is, a part of the second current collector foil exposed portion 9 a is the second terminal of the electricity storage device 1. Charging and discharging of the electricity storage device 1 are performed through the first and second terminals.

外装フィルム３は、アルミニウム金属箔の外面にナイロン層が重ねられアルミニウム金属箔の内面にポリプロピレン層が重ねられて構成されたラミネートフィルムとされている。外装フィルム３の内面は、ポリプロピレン層が加熱されることにより熱融着可能になっている。また、この例では、外装フィルム３の形状がチューブ状とされている。これにより、外装フィルム３の両端部には、第１の開口部１３及び第２の開口部１４が設けられている。   The exterior film 3 is a laminate film that is configured by overlapping a nylon layer on an outer surface of an aluminum metal foil and a polypropylene layer on an inner surface of the aluminum metal foil. The inner surface of the exterior film 3 can be heat-sealed by heating the polypropylene layer. In this example, the shape of the exterior film 3 is a tube shape. Thereby, the first opening 13 and the second opening 14 are provided at both ends of the exterior film 3.

なお、外装フィルム３のアルミニウム金属箔の外面に重ねられる層は、ナイロン層の代わりに、ポリエチレンテレフタレート等の樹脂の層としてもよい。また、アルミニウム金属箔の内面に重ねられる層は、ポリプロピレン層の代わりに、ポリエチレン等の熱可塑性樹脂の層としてもよい。さらに、第１及び第２の密閉用樹脂１１，１２の材料は、第１及び第２の集電箔７，９と外装フィルム３の内面との熱融着性が良好なものであればよく、変性ポリプロピレンの代わりに、変性ポリエチレン等の熱可塑性樹脂としてもよい。   In addition, the layer overlaid on the outer surface of the aluminum metal foil of the exterior film 3 may be a resin layer such as polyethylene terephthalate instead of the nylon layer. Further, the layer superimposed on the inner surface of the aluminum metal foil may be a layer of a thermoplastic resin such as polyethylene instead of the polypropylene layer. Further, the material of the first and second sealing resins 11 and 12 may be any material as long as the heat fusion property between the first and second current collecting foils 7 and 9 and the inner surface of the exterior film 3 is good. Instead of the modified polypropylene, a thermoplastic resin such as modified polyethylene may be used.

蓄電デバイス本体２は、第１の端子（第１の集電箔露出部７ａの一部）を第１の開口部１３から外装フィルム３外へ露出させるとともに第２の端子（第２の集電箔露出部９ａの一部）を第２の開口部１４から外装フィルム３外へ露出させて、外装フィルム３内に収容されている。第１の開口部１３は、第１の集電箔露出部７ａを通した状態で熱融着により密閉されている。第２の開口部１４は、第２の集電箔露出部９ａを通した状態で熱融着により密閉されている。   The power storage device body 2 exposes the first terminal (a part of the first current collector foil exposed portion 7a) from the first opening 13 to the outside of the exterior film 3 and the second terminal (second current collector). A portion of the foil exposed portion 9 a) is exposed to the outside of the exterior film 3 from the second opening 14 and is accommodated in the exterior film 3. The first opening 13 is hermetically sealed by heat fusion in a state where the first current collector foil exposed portion 7a is passed through. The second opening 14 is sealed by heat fusion in a state where the second current collector foil exposed portion 9a is passed.

次に、蓄電デバイス１の製造方法について説明する。まず、第１の集電箔７に第１の電極８を設けて第１の電極シート４を作製し、第２の集電箔９に第２の電極１０を設けて第２の電極シート５を作製しておく（シート作製工程）。   Next, a method for manufacturing the electricity storage device 1 will be described. First, the 1st electrode 8 is provided in the 1st current collection foil 7, the 1st electrode sheet 4 is produced, the 2nd electrode 10 is provided in the 2nd current collection foil 9, and the 2nd electrode sheet 5 Is prepared (sheet preparation step).

この後、第１の集電箔露出部７ａの所定の位置に第１の密閉用樹脂１１を第１の集電箔７の長さ方向に沿って設け、第２の集電箔露出部９ａの所定の位置に第２の密閉用樹脂１２を第２の集電箔９の長さ方向に沿って設ける。このとき、第１の密閉用樹脂１１は第１の集電箔露出部７ａの両面に設け、第２の密閉用樹脂１２は第２の集電箔露出部９ａの両面に設ける（樹脂塗布工程）。   Thereafter, a first sealing resin 11 is provided along a length direction of the first current collector foil 7 at a predetermined position of the first current collector foil exposed portion 7a, and the second current collector foil exposed portion 9a. A second sealing resin 12 is provided at a predetermined position along the length direction of the second current collector foil 9. At this time, the first sealing resin 11 is provided on both surfaces of the first current collecting foil exposed portion 7a, and the second sealing resin 12 is provided on both surfaces of the second current collecting foil exposed portion 9a (resin coating step). ).

この後、図２に示すように、セパレータ６を介在させながら第１の電極シート４及び第２の電極シート５を重ねる。このとき、第１の電極シート４、第２の電極シート５及びセパレータ６のそれぞれの長さ方向を一致させる。また、第１及び第２の電極シート４，５は、第１及び第２の集電箔露出部７ａ，９ａが互いに反対方向へ突出するように重ねる。さらに、セパレータ６は、第１及び第２の電極８，１０間に挟まれる位置に配置する。セパレータ６は、第１及び第２の電極８，１０間に挟まれる位置だけでなく、外側に露出する第１及び第２の電極８，１０のいずれか一方にも重ねる（重ね工程）。   Thereafter, as shown in FIG. 2, the first electrode sheet 4 and the second electrode sheet 5 are overlapped with the separator 6 interposed. At this time, the length directions of the first electrode sheet 4, the second electrode sheet 5, and the separator 6 are matched. The first and second electrode sheets 4 and 5 are overlapped so that the first and second current collector foil exposed portions 7a and 9a protrude in opposite directions. Further, the separator 6 is disposed at a position sandwiched between the first and second electrodes 8 and 10. The separator 6 overlaps not only the position sandwiched between the first and second electrodes 8 and 10 but also one of the first and second electrodes 8 and 10 exposed to the outside (stacking step).

この後、第１及び第２の電極シート４，５の長さ方向について第１の電極シート４、第２の電極シート５及びセパレータ６をまとめて巻いて、図３に示すような扁平状の積層体とする。これにより、第１の集電箔露出部７ａ同士が互いに重なり、第２の集電箔露出部９ａ同士が互いに重なる。また、互いに重なる第１の集電箔露出部７ａ間には第１の密閉用樹脂１１が介在し、互いに重なる第２の集電箔露出部９ａ間には第２の密閉用樹脂１２が介在する（巻き工程）。   Thereafter, the first electrode sheet 4, the second electrode sheet 5 and the separator 6 are rolled together in the length direction of the first and second electrode sheets 4, 5 to form a flat shape as shown in FIG. 3. A laminate is used. Accordingly, the first current collector foil exposed portions 7a overlap each other, and the second current collector foil exposed portions 9a overlap each other. Further, a first sealing resin 11 is interposed between the first current collecting foil exposed portions 7a overlapping each other, and a second sealing resin 12 is interposed between the second current collecting foil exposed portions 9a overlapping each other. (Winding process).

この後、加熱シーラ（例えばインパルス式ヒートシーラ等）を用いることにより第１の密閉用樹脂１１及び第２の密閉用樹脂１２を所定の熱融着条件下で加熱する。これにより、互いに重なる第１の集電箔露出部７ａ同士が第１の密閉用樹脂１１を介して熱融着され、互いに重なる第２の集電箔露出部９ａ同士が第２の密閉用樹脂１２を介して熱融着される。これにより、蓄電デバイス本体２が完成する（蓄電デバイス本体作製工程）。   Thereafter, the first sealing resin 11 and the second sealing resin 12 are heated under predetermined heat-sealing conditions by using a heating sealer (for example, an impulse heat sealer or the like). As a result, the first current collector foil exposed portions 7a that overlap each other are heat-sealed via the first sealing resin 11, and the second current collector foil exposed portions 9a that overlap each other are second sealed resins. 12 is heat-sealed. Thereby, the electrical storage device main body 2 is completed (electric storage device main body manufacturing process).

この後、蓄電デバイス本体２を外装フィルム３内に収容する。このとき、第１の集電箔露出部７ａにおける第１の密閉用樹脂１１の位置よりも外側の部分（第１の端子）を第１の開口部１３から外装フィルム３外へ露出させ、第２の集電箔露出部９ａにおける第２の密閉用樹脂１２の位置よりも外側の部分（第２の端子）を第２の開口部１４から外装フィルム３外へ露出させておく（収容工程）。   Thereafter, the electricity storage device body 2 is accommodated in the exterior film 3. At this time, a portion (first terminal) outside the position of the first sealing resin 11 in the first current collector foil exposed portion 7a is exposed from the first opening 13 to the outside of the exterior film 3, A portion (second terminal) outside the position of the second sealing resin 12 in the second current collector foil exposed portion 9a is exposed from the second opening 14 to the outside of the exterior film 3 (accommodating step). .

この後、加熱シーラ（例えばインパルス式ヒートシーラ等）を用いることにより、外装フィルム３とともに第１の密閉用樹脂１１及び第２の密閉用樹脂１２を加熱する。この結果、第１の密閉用樹脂１１による熱融着及び外装フィルム３の内面同士の熱融着により、第１の集電箔露出部７ａが通されたまま第１の開口部１３が密閉され、第２の密閉用樹脂１２による熱融着及び外装フィルム３の内面同士の熱融着により、第２の集電箔露出部９ａが通されたまま第２の開口部１４が密閉される。このとき、第１及び第２の開口部１３，１４のいずれかの一部を電解液注入口として開けておく（第１密閉工程）。   Thereafter, the first sealing resin 11 and the second sealing resin 12 are heated together with the exterior film 3 by using a heating sealer (for example, an impulse heat sealer). As a result, the first opening 13 is hermetically sealed while the first current collector foil exposed portion 7a is passed through the heat sealing by the first sealing resin 11 and the heat sealing of the inner surfaces of the exterior film 3. The second opening 14 is hermetically sealed while the second current collector foil exposed portion 9a is passed through the heat sealing with the second sealing resin 12 and the heat sealing between the inner surfaces of the exterior film 3. At this time, a part of any one of the first and second openings 13 and 14 is opened as an electrolyte injection port (first sealing step).

この後、電解液を電解液注入口から外装フィルム３内に注入する（電解液注入工程）。この後、電解液注入口の密閉用樹脂を所定の減圧下で加熱することにより電解液注入口を完全密閉する（第２密閉工程）。これにより、蓄電デバイス１が完成する。   Thereafter, the electrolytic solution is injected into the exterior film 3 from the electrolytic solution injection port (electrolytic solution injection step). Thereafter, the electrolyte injection port is completely sealed by heating the sealing resin of the electrolyte injection port under a predetermined reduced pressure (second sealing step). Thereby, the electrical storage device 1 is completed.

このような蓄電デバイス１では、第１の集電箔７の一部である第１の集電箔露出部７ａが外装フィルム３外へ第１の端子として露出され、第２の集電箔９の一部である第２の集電箔露出部９ａが外装フィルム３外へ第２の端子として露出されているので、外装フィルム３内で積層体と端子とを接合する溶接部分をなくすことができる。従って、蓄電デバイス１における電気抵抗の増大が抑制されてエネルギ効率の低下を抑制することができ、蓄電デバイス１の信頼性の向上も図ることができる。また、外装フィルム３内での溶接部分のスペースが不要となるので、蓄電デバイス１の小形化を図ることができる。   In such an electricity storage device 1, the first current collector foil exposed portion 7 a that is a part of the first current collector foil 7 is exposed to the outside of the exterior film 3 as the first terminal, and the second current collector foil 9. Since the second current collector foil exposed portion 9a which is a part of the outer film 3 is exposed as the second terminal to the outside of the outer film 3, it is possible to eliminate the welded portion that joins the laminate and the terminal in the outer film 3 it can. Therefore, an increase in electrical resistance in the electricity storage device 1 can be suppressed, a reduction in energy efficiency can be suppressed, and the reliability of the electricity storage device 1 can be improved. Moreover, since the space of the welding part in the exterior film 3 becomes unnecessary, the electrical storage device 1 can be reduced in size.

また、蓄電デバイス本体２は、第１の電極シート４、第２の電極シート５及びセパレータ６が第１及び第２の集電箔７，９の長さ方向について巻かれることにより構成された積層体となっているので、第１の電極シート４、第２の電極シート５及びセパレータ６を重ねて巻くだけで複数層の積層体を容易に作製することができる。   In addition, the electricity storage device body 2 is formed by laminating the first electrode sheet 4, the second electrode sheet 5, and the separator 6 in the length direction of the first and second current collector foils 7 and 9. Therefore, a multi-layer laminate can be easily produced simply by stacking and winding the first electrode sheet 4, the second electrode sheet 5, and the separator 6.

また、互いに重なる第１の集電箔露出部７ａ間が第１の密閉用樹脂１１による熱融着により密閉され、互いに重なる第２の集電箔露出部９ａ間が第２の密閉用樹脂１２による熱融着により密閉されているので、第１の集電箔露出部７ａ及び第２の集電箔露出部９ａのそれぞれが個別にまとまった状態をより確実に維持することができ、蓄電デバイス１の端子としての信頼性の向上を図ることができる。   In addition, the space between the first current collector foil exposed portions 7a that overlap each other is sealed by thermal fusion with the first sealing resin 11, and the space between the second current collector foil exposed portions 9a that overlap each other is sealed. Therefore, each of the first current collector foil exposed portion 7a and the second current collector foil exposed portion 9a can be more reliably maintained separately, and the power storage device It is possible to improve the reliability of the first terminal.

なお、上記の例では、第１の密閉用樹脂１１同士及び第２の密閉用樹脂１２同士のいずれについても熱融着を完了させた後に、蓄電デバイス本体２を外装フィルム３内に収容して第１密閉工程及び第２密閉工程を行うようになっているが、第１の密閉用樹脂１１同士の熱融着及び第２の密閉用樹脂１２同士の熱融着のいずれか一方が完了していない未完成の蓄電デバイス本体２を外装フィルム３内に収容して第１密閉工程及び第２密閉工程を行うようにしてもよい。この場合、熱融着が完了していない密閉用樹脂の熱融着は、第１密閉工程及び第２密閉工程のいずれかにおいて、外装フィルム３の内面同士の熱融着と同時に行われる。このようにすれば、第１及び第２の密閉用樹脂１１，１２によって完全に密閉されていない段階で蓄電デバイス本体２を電解液に浸すことができるので、蓄電デバイス本体２内への電解液の含浸時間を短縮することができる。   In the above example, after the heat sealing is completed for both the first sealing resin 11 and the second sealing resin 12, the power storage device body 2 is accommodated in the exterior film 3. Although the first sealing step and the second sealing step are performed, either one of the heat sealing between the first sealing resins 11 and the heat sealing between the second sealing resins 12 is completed. An unfinished power storage device body 2 that is not completed may be accommodated in the exterior film 3 to perform the first sealing step and the second sealing step. In this case, the heat sealing of the sealing resin for which the heat sealing is not completed is performed simultaneously with the heat sealing of the inner surfaces of the exterior film 3 in either the first sealing process or the second sealing process. In this way, since the electricity storage device body 2 can be immersed in the electrolyte solution at a stage where it is not completely sealed by the first and second sealing resins 11 and 12, the electrolyte solution into the electricity storage device body 2 can be obtained. The impregnation time can be shortened.

実施の形態２．
上記の例では、第１の電極シート４が巻かれて構成された第１の集電箔露出部７ａがそのまま第１の端子とされ、第２の電極シート５が巻かれて構成された第２の集電箔露出部９ａがそのまま第２の端子とされているが、第１及び第２の集電箔露出部７ａ，９ａのそれぞれの一部を切り取って所定の形状としてもよい。 Embodiment 2. FIG.
In the above example, the first current collector foil exposed portion 7a formed by winding the first electrode sheet 4 is directly used as the first terminal, and the second electrode sheet 5 is wound and configured. Although the second current collector foil exposed portion 9a is used as the second terminal as it is, a part of each of the first and second current collector foil exposed portions 7a, 9a may be cut out to have a predetermined shape.

即ち、図４は、この発明の実施の形態２による蓄電デバイスの第１の端子の構成を示す要部斜視図である。また、図５は、図４の第１の集電箔露出部７ａの一部が切り取られる前の状態を示す斜視図である。図において、互いに重なった第１の集電箔露出部７ａの一部は、図５の切り取り線２１を境界として積層体から切り取られている。即ち、第１の電極シート４、第２の電極シート５及びセパレータ６により構成された扁平状の積層体の幅方向両端部の位置における第１の集電箔露出部７ａの部分が積層体から切り取られている。これにより、第１の集電箔露出部７ａは、所定の形状とされた第１の端子として残されている。   That is, FIG. 4 is a main part perspective view showing the configuration of the first terminal of the electric storage device according to the second embodiment of the present invention. FIG. 5 is a perspective view showing a state before a part of the first current collector foil exposed portion 7a in FIG. 4 is cut off. In the figure, a part of the first current collector foil exposed portions 7a overlapping each other is cut from the laminate with the cut line 21 in FIG. 5 as a boundary. That is, the portion of the first current collector foil exposed portion 7a at the positions of both end portions in the width direction of the flat laminated body constituted by the first electrode sheet 4, the second electrode sheet 5, and the separator 6 is removed from the laminated body. It has been cut out. Thereby, the 1st current collection foil exposure part 7a is left as a 1st terminal made into the predetermined shape.

第２の集電箔露出部９ａも、第１の集電箔露出部７ａと同様に、一部が切り取られることにより所定の形状の第２の端子として積層体に残されている。他の構成は実施の形態１と同様である。   Similarly to the first current collector foil exposed portion 7a, the second current collector foil exposed portion 9a is also left as a second terminal having a predetermined shape by being partially cut off. Other configurations are the same as those in the first embodiment.

次に、蓄電デバイス１の製造方法について説明する。積層体の作製後、互いに重なる第１の集電箔露出部７ａ同士を第１の密閉用樹脂１１を介して熱融着し、互いに重なる第２の集電箔露出部９ａ同士を第２の密閉用樹脂１２を介して熱融着するまでの工程は、実施の形態１と同様である。   Next, a method for manufacturing the electricity storage device 1 will be described. After the laminate is manufactured, the first current collector foil exposed portions 7a that overlap each other are heat-sealed via the first sealing resin 11, and the second current collector foil exposed portions 9a that overlap each other are second bonded. The process until heat-sealing via the sealing resin 12 is the same as in the first embodiment.

この後、第１及び第２の集電箔露出部７ａ，９ａのそれぞれの一部を切り取ることにより、蓄電デバイス本体２が完成する。このとき、第１の集電箔露出部７ａの一部とともに第１の密閉用樹脂１１の一部も切り取り、第２の集電箔露出部９ａの一部とともに第２の密閉用樹脂１２の一部も切り取る。第１及び第２の集電箔露出部７ａ，９ａのそれぞれの一部が切り取られることにより、電解液を注入可能な電解液注入口が蓄電デバイス本体２に形成される（蓄電デバイス本体作製工程）。   Thereafter, a part of each of the first and second current collector foil exposed portions 7a and 9a is cut off, whereby the power storage device body 2 is completed. At this time, a part of the first sealing resin 11 is cut out together with a part of the first current collecting foil exposed part 7a, and a part of the second sealing resin 12 is cut out together with a part of the second current collecting foil exposed part 9a. Cut out some. By cutting off a part of each of the first and second current collector foil exposed portions 7a and 9a, an electrolytic solution injection port through which an electrolytic solution can be injected is formed in the electrical storage device body 2 (storage device body manufacturing process) ).

この後、蓄電デバイス本体２を外装フィルム３内に収容する。このとき、第１の集電箔露出部７ａにおける第１の密閉用樹脂１１の位置よりも外側の部分（第１の端子）を第１の開口部１３から外装フィルム３外へ露出させ、第２の集電箔露出部９ａにおける第２の密閉用樹脂１２の位置よりも外側の部分（第２の端子）を第２の開口部１４から外装フィルム３外へ露出させておく（収容工程）。   Thereafter, the electricity storage device body 2 is accommodated in the exterior film 3. At this time, a portion (first terminal) outside the position of the first sealing resin 11 in the first current collector foil exposed portion 7a is exposed from the first opening 13 to the outside of the exterior film 3, A portion (second terminal) outside the position of the second sealing resin 12 in the second current collector foil exposed portion 9a is exposed from the second opening 14 to the outside of the exterior film 3 (accommodating step). .

この後、加熱シーラ（例えばインパルス式ヒートシーラ等）を用いることにより、外装フィルム３とともに第１の密閉用樹脂１１及び第２の密閉用樹脂１２のいずれか一方を加熱し、第１及び第２の開口部１３，１４のいずれか一方を熱融着により密閉する（第１密閉工程）。   Thereafter, by using a heating sealer (for example, an impulse heat sealer or the like), either the first sealing resin 11 or the second sealing resin 12 is heated together with the exterior film 3, and the first and second sealing resins are heated. Either one of the openings 13 and 14 is sealed by heat sealing (first sealing step).

この後、電解液注入口から外装フィルム３内に電解液を注入する（電解液注入工程）。この後、第１及び第２の開口部１３，１４のいずれか他方を熱融着により密閉する（第２密閉工程）。これにより、蓄電デバイス１が完成する。   Thereafter, the electrolytic solution is injected into the exterior film 3 from the electrolytic solution injection port (electrolytic solution injection step). Thereafter, the other of the first and second openings 13 and 14 is sealed by heat sealing (second sealing step). Thereby, the electrical storage device 1 is completed.

このような蓄電デバイス１では、第１及び第２の集電箔露出部７ａ，９ａのそれぞれが一部切り取られて所定の形状とされているので、蓄電デバイス１の第１及び第２の端子のそれぞれの形状及びサイズを自由に設定することができる。また、第１及び第２の集電箔露出部７ａ，９ａのそれぞれの一部を切り取ることにより電解液注入口を蓄電デバイス本体２に形成することができ、外装フィルム３内に電解液を注入するときの十分な注液経路を確保することができる。   In such an electricity storage device 1, since each of the first and second current collector foil exposed portions 7a and 9a is partially cut out to have a predetermined shape, the first and second terminals of the electricity storage device 1 Each shape and size can be freely set. Further, by cutting off a part of each of the first and second current collector foil exposed portions 7a and 9a, an electrolyte solution injection port can be formed in the electricity storage device body 2, and the electrolyte solution is injected into the exterior film 3 It is possible to ensure a sufficient liquid injection route.

実施の形態３．
上記実施の形態２では、第１の集電箔露出部７ａの一部が切り取られて１本の第１の端子が蓄電デバイス本体２に形成され、第２の集電箔露出部９ａの一部が切り取られて１本の第２の端子が蓄電デバイス本体２に形成されているが、第１の集電箔露出部７ａの一部を切り取って２本の第１の端子を蓄電デバイス本体２に形成し、第２の集電箔露出部９ａの一部を切り取って２本の第２の端子を蓄電デバイス本体２に形成してもよい。 Embodiment 3 FIG.
In the second embodiment, a part of the first current collector foil exposed portion 7a is cut off to form one first terminal on the power storage device body 2, and one of the second current collector foil exposed portions 9a is formed. The part is cut off and one second terminal is formed on the electricity storage device body 2, but a part of the first current collector foil exposed part 7 a is cut off and the two first terminals are attached to the electricity storage device body. 2, and part of the second current collector foil exposed portion 9 a may be cut off to form two second terminals on the power storage device body 2.

即ち、図６は、この発明の実施の形態３による蓄電デバイスの第１の端子の構成を示す要部斜視図である。蓄電デバイス本体２では、扁平状の積層体の幅方向両端部及び中央部のそれぞれの位置における第１の集電箔露出部７ａの部分が積層体から切り取られ、積層体の幅方向両端部及び中央部のそれぞれの位置における第２の集電箔露出部９ａの部分が積層体から切り取られている。これにより、第１の集電箔露出部７ａの残った部分が２本の第１の端子となり、第２の集電箔露出部９ａの残った部分が２本の第２の端子となっている。他の構成は上記の例と同様である。   That is, FIG. 6 is a perspective view of the main part showing the configuration of the first terminal of the electricity storage device according to Embodiment 3 of the present invention. In the electricity storage device body 2, the portions of the first current collector foil exposed portions 7 a at the respective positions in the widthwise both ends and the center of the flat laminate are cut from the laminate, and both the widthwise ends of the laminate and The portion of the second current collector foil exposed portion 9a at each position in the center is cut out from the laminate. Thus, the remaining portion of the first current collector foil exposed portion 7a becomes two first terminals, and the remaining portion of the second current collector foil exposed portion 9a becomes two second terminals. Yes. Other configurations are the same as in the above example.

このようにすれば、第１及び第２の端子の本数をそれぞれ自由に設定することができ、組電池やモジュール等の設計の都合に合わせた単電池構造を容易に作製することができる。また、第１の電極シート４、第２の電極シート５及びセパレータ６が巻かれて構成された積層体の幅を変更する場合であっても、第１及び第２の端子の位置は積層体の幅の変更の影響を受けることなく設定することができる。従って、第１及び第２の端子の位置を積層体の大きさに関係なく決めることができ、設計の都合に合わせた位置に設定された第１及び第２の端子を有する種々の大きさの単電池を容易に作製することができる。   If it does in this way, the number of the 1st and 2nd terminal can be set freely, respectively, and the single cell structure suitable for the convenience of design, such as an assembled battery and a module, can be produced easily. Even when the width of the laminate formed by winding the first electrode sheet 4, the second electrode sheet 5, and the separator 6 is changed, the positions of the first and second terminals are the laminate. It can be set without being affected by the change of the width of. Therefore, the positions of the first and second terminals can be determined regardless of the size of the laminated body, and the first and second terminals having various sizes having the first and second terminals set at positions suitable for the design. A single battery can be easily manufactured.

実施の形態４．
図７は、この発明の実施の形態４による蓄電デバイスの要部の構成を示す斜視図である。図において、蓄電デバイス本体２は、長さ方向を一致させて互いに重ねられた第１の電極シート４、第２の電極シート５及びセパレータ６が第１及び第２の電極シート４，５の長さ方向（第１及び第２の集電箔７，９の長さ方向）について山折り及び谷折りを繰り返して折り畳まれることにより扁平状に構成された積層体となっている。 Embodiment 4 FIG.
FIG. 7 is a perspective view showing a configuration of a main part of an electricity storage device according to Embodiment 4 of the present invention. In the figure, the power storage device body 2 includes a first electrode sheet 4, a second electrode sheet 5, and a separator 6 that are overlapped with each other in the length direction. The laminated body is formed into a flat shape by repeatedly folding the mountain fold and the valley fold in the vertical direction (the length direction of the first and second current collector foils 7 and 9).

第１の電極シート４における第１の電極８は、第１の集電箔７の片面のみに設けられている。また、第２の電極シート５における第２の電極１０は、第２の集電箔９の片面のみに設けられている。他の構成及び製造方法は実施の形態１と同様である。   The first electrode 8 in the first electrode sheet 4 is provided only on one side of the first current collector foil 7. The second electrode 10 in the second electrode sheet 5 is provided only on one side of the second current collector foil 9. Other configurations and manufacturing methods are the same as those in the first embodiment.

このような蓄電デバイスでは、蓄電デバイス本体２は、第１の電極シート４、第２の電極シート５及びセパレータ６が第１及び第２の集電箔７，９の長さ方向について山折り及び谷折りを繰り返して折り畳まれることにより構成された積層体となっているので、第１の電極シート４、第２の電極シート５及びセパレータ６を重ねて折り畳むだけで複数層の積層体を容易に作製することができる。   In such an electricity storage device, the electricity storage device body 2 includes the first electrode sheet 4, the second electrode sheet 5, and the separator 6 that are mountain-folded in the longitudinal direction of the first and second current collector foils 7 and 9. Since the laminated body is formed by repeatedly folding the valley, it is easy to form a laminated body of a plurality of layers by simply folding the first electrode sheet 4, the second electrode sheet 5 and the separator 6. Can be produced.

なお、第１の電極シート４が折り畳まれて構成された第１の集電箔露出部７ａがそのまま第１の端子とされ、第２の電極シート５が折り畳まれて構成された第２の集電箔露出部９ａがそのまま第２の端子とされているが、実施の形態２又は３に示すように、折り畳まれた第１及び第２の集電箔露出部７ａ，９ａのそれぞれの一部を切り取ることにより第１及び第２の集電箔露出部７ａ，９ａのそれぞれを第１及び第２の端子として残すようにしてもよい。このようにすれば、電解液注入口を蓄電デバイス本体２に形成することができ、外装フィルム３内に電解液を注入するときの十分な注液経路を確保することができる。   The first current collector foil exposed portion 7a configured by folding the first electrode sheet 4 is used as a first terminal as it is, and the second current collector configured by folding the second electrode sheet 5 is used. Although the electric foil exposed portion 9a is directly used as the second terminal, as shown in the second or third embodiment, a part of each of the folded first and second current collecting foil exposed portions 7a and 9a. The first and second current collector foil exposed portions 7a and 9a may be left as the first and second terminals by cutting off. If it does in this way, an electrolyte solution injection hole can be formed in the electrical storage device main body 2, and sufficient injection | pouring path | routes when inject | pouring electrolyte solution in the exterior film 3 can be ensured.

実施の形態５．
図８は、この発明の実施の形態５による蓄電デバイスの要部の構成を示す斜視図である。図において、蓄電デバイス本体２は、複数の第１の電極シート４と複数の第２の電極シート５とがセパレータ６を挟みながら交互に重ねられることにより構成された積層体となっている。第１の電極シート４、第２の電極シート５及びセパレータ６のそれぞれの形状は、短冊状となっている。 Embodiment 5 FIG.
FIG. 8 is a perspective view showing a configuration of a main part of an electricity storage device according to Embodiment 5 of the present invention. In the figure, the electricity storage device main body 2 is a laminate configured by alternately stacking a plurality of first electrode sheets 4 and a plurality of second electrode sheets 5 with a separator 6 interposed therebetween. Each shape of the 1st electrode sheet 4, the 2nd electrode sheet 5, and the separator 6 is a strip shape.

次に、蓄電デバイスの製造方法について説明する。各第１の電極シート４のそれぞれの第１の集電箔露出部７ａには第１の密閉用樹脂１１を設けておき、各第２の電極シート５のそれぞれの第２の集電箔露出部９ａには第２の密閉用樹脂１２を設けておく。第１の密閉用樹脂１１は第１の集電箔露出部７ａの両面に設け、第２の密閉用樹脂１２は第２の集電箔露出部９ａの両面に設ける。   Next, the manufacturing method of an electrical storage device is demonstrated. A first sealing resin 11 is provided on each first current collector foil exposed portion 7 a of each first electrode sheet 4, and each second current collector foil exposed on each second electrode sheet 5 is exposed. A second sealing resin 12 is provided in the portion 9a. The first sealing resin 11 is provided on both surfaces of the first current collector foil exposed portion 7a, and the second sealing resin 12 is provided on both surfaces of the second current collector foil exposed portion 9a.

この後、セパレータ６を挟みながら第１の電極シート４と第２の電極シート５とを交互に重ねる。このとき、図８に示すように、各第１の密閉用樹脂１１の位置を合わせて第１の電極シート４を重ね、各第２の密閉用樹脂１２の位置を合わせて第２の電極シート５を重ねる。   Thereafter, the first electrode sheets 4 and the second electrode sheets 5 are alternately stacked while sandwiching the separator 6 therebetween. At this time, as shown in FIG. 8, the first electrode sheets 4 are overlapped with the positions of the first sealing resins 11, and the second electrode sheets are aligned with the positions of the second sealing resins 12. 5 is piled up.

この後、加熱シーラ（例えばインパルス式ヒートシーラ等）により第１及び第２の密閉用樹脂１１，１２のそれぞれを加熱し、各第１の集電箔露出部７ａ間を熱融着させ、各第２の集電箔露出部９ａ間を熱融着させる。これにより、蓄電デバイス本体２が作製される（蓄電デバイス本体作製工程）。この後の手順は実施の形態１と同様である。   Thereafter, each of the first and second sealing resins 11 and 12 is heated by a heating sealer (for example, an impulse heat sealer or the like), and the first current collector foil exposed portions 7a are heat-sealed. The two current collector foil exposed portions 9a are heat-sealed. Thereby, the electrical storage device main body 2 is manufactured (electric storage device main body manufacturing process). The subsequent procedure is the same as in the first embodiment.

このような蓄電デバイスでは、蓄電デバイス本体２は、複数の第１の電極シート４と複数の第２の電極シート５とがセパレータ６を挟みながら交互に重ねられることにより構成された積層体となっているので、セパレータ６を挟みながら第１の電極シート４と第２の電極シート５とを重ねるだけで複数層の積層体を容易に作製することができる。   In such an electricity storage device, the electricity storage device body 2 is a laminate configured by alternately stacking a plurality of first electrode sheets 4 and a plurality of second electrode sheets 5 with the separators 6 interposed therebetween. Therefore, a multi-layered laminate can be easily produced by simply stacking the first electrode sheet 4 and the second electrode sheet 5 with the separator 6 interposed therebetween.

なお、上記の例では、互いに重ねられた複数の第１の集電箔露出部７ａがそのまま第１の端子とされ、互いに重ねられた複数の第２の電極シート５がそのまま第２の端子とされているが、実施の形態２又は３に示すように、各第１の集電箔露出部７ａの一部を切り取って残された第１の集電箔露出部７ａの部分を第１の端子としてもよい。また、各第２の集電箔露出部９ａの一部を切り取って残された第１の集電箔露出部９ａの部分を第２の端子としてもよい。   In the above example, the plurality of first current collector foil exposed portions 7a stacked on each other are directly used as the first terminals, and the plurality of second electrode sheets 5 stacked on each other are directly used as the second terminals. However, as shown in the second or third embodiment, a part of the first current collector foil exposed portion 7a left by cutting off a part of each first current collector foil exposed portion 7a is used as the first current collector foil exposed portion 7a. It may be a terminal. Moreover, it is good also considering the part of the 1st current collection foil exposure part 9a left by cutting off a part of each 2nd current collection foil exposure part 9a as a 2nd terminal.

実施の形態６．
図９は、この発明の実施の形態６による蓄電デバイスの構成を示す断面図である。また、図１０は、図９の蓄電デバイス本体を示す展開図である。図において、セパレータ６は、第１及び第２の密閉用樹脂１１，１２のいずれかとまとめて熱融着されている。この例では、第１及び第２の電極８，１０間に挟まれた一方のセパレータ６が第１の密閉用樹脂１１とまとめて熱融着され、第２の電極１０の外側に重ねられた他方のセパレータ６が第２の密閉用樹脂１２とまとめて熱融着されている。他の構成は実施の形態１と同様である。 Embodiment 6 FIG.
FIG. 9 is a cross-sectional view showing a configuration of an electricity storage device according to Embodiment 6 of the present invention. FIG. 10 is a development view showing the power storage device body of FIG. In the figure, the separator 6 is heat-sealed together with one of the first and second sealing resins 11 and 12. In this example, one separator 6 sandwiched between the first and second electrodes 8, 10 is heat-sealed together with the first sealing resin 11 and overlapped on the outside of the second electrode 10. The other separator 6 is heat-sealed together with the second sealing resin 12. Other configurations are the same as those in the first embodiment.

次に、蓄電デバイスの製造方法について説明する。まず、シート作製工程及び樹脂塗布工程の後、第１の電極シート４、一方のセパレータ６、第２の電極シート５及び他方のセパレータ６の順に重ねる。このとき、一方のセパレータ６の縁部を第１の密閉用樹脂１１に重ね、他方のセパレータ６の縁部を第２の密閉用樹脂１２に重ねておく（重ね工程）。   Next, the manufacturing method of an electrical storage device is demonstrated. First, after the sheet preparation step and the resin coating step, the first electrode sheet 4, one separator 6, the second electrode sheet 5, and the other separator 6 are stacked in this order. At this time, the edge of one separator 6 is overlaid on the first sealing resin 11, and the edge of the other separator 6 is overlaid on the second sealing resin 12 (stacking step).

この後、第１及び第２の電極シート４，５の長さ方向について第１の電極シート４、第２の電極シート５及び各セパレータ６をまとめて巻く。これにより、一方のセパレータ６の縁部が第１の密閉用樹脂１１間に把持され、他方のセパレータ６の縁部が第２の密閉用樹脂１２間に把持される（巻き工程）。   Thereafter, the first electrode sheet 4, the second electrode sheet 5, and each separator 6 are wound together in the length direction of the first and second electrode sheets 4, 5. Thereby, the edge part of one separator 6 is hold | gripped between the 1st sealing resin 11, and the edge part of the other separator 6 is hold | gripped between the 2nd sealing resin 12 (winding process).

この後、加熱シーラ（例えばインパルス式ヒートシーラ等）を用いることにより第１の密閉用樹脂１１及び第２の密閉用樹脂１２を所定の熱融着条件下で加熱する。これにより、互いに重なる第１の集電箔露出部７ａ間が一方のセパレータ６の縁部とともにまとめて熱融着される。また、互いに重なる第２の集電箔露出部９ａ間が他方のセパレータ６の縁部とともにまとめて熱融着される。このようにして、蓄電デバイス本体２を作製する（蓄電デバイス本体作製工程）。この後の手順は実施の形態１と同様である。   Thereafter, the first sealing resin 11 and the second sealing resin 12 are heated under predetermined heat-sealing conditions by using a heating sealer (for example, an impulse heat sealer or the like). As a result, the first current collector foil exposed portions 7 a that overlap each other are heat-sealed together with the edge of one separator 6. Further, the second current collector foil exposed portions 9 a that overlap each other are heat-sealed together with the edge of the other separator 6. Thus, the electrical storage device main body 2 is manufactured (electric storage device main body manufacturing process). The subsequent procedure is the same as in the first embodiment.

このような蓄電デバイスでは、セパレータ６が第１及び第２の密閉用樹脂１１，１２のいずれかとまとめて熱融着されているので、第１及び第２の電極シート４，５のいずれかの位置に対するセパレータ６の位置をより確実に維持することができる。これにより、蓄電デバイスが例えば衝撃等を受けた場合であっても、各セパレータ６は第１及び第２の電極シート４，５に対してずれにくくなり、第１及び第２の電極８，１０間にセパレータ６をより確実に介在させることができる。従って、第１及び第２の電極８，１０間が短絡する故障の発生を抑制することができ、蓄電デバイスの信頼性の向上を図ることができる。   In such an electricity storage device, since the separator 6 is heat-sealed together with one of the first and second sealing resins 11 and 12, any one of the first and second electrode sheets 4 and 5 is used. The position of the separator 6 with respect to the position can be more reliably maintained. Accordingly, even when the power storage device receives an impact or the like, for example, each separator 6 is less likely to be displaced with respect to the first and second electrode sheets 4 and 5, and the first and second electrodes 8 and 10. It is possible to interpose the separator 6 more reliably between them. Therefore, it is possible to suppress the occurrence of a short circuit between the first and second electrodes 8 and 10 and to improve the reliability of the electricity storage device.

なお、上記の例では、互いに重ねられた複数の第１の集電箔露出部７ａがそのまま第１の端子とされ、互いに重ねられた複数の第２の電極シート５がそのまま第２の端子とされているが、実施の形態２又は３に示すように、各第１の集電箔露出部７ａの一部を切り取って残された第１の集電箔露出部７ａの部分を第１の端子としてもよい。また、各第２の集電箔露出部９ａの一部を切り取って残された第１の集電箔露出部９ａの部分を第２の端子としてもよい。   In the above example, the plurality of first current collector foil exposed portions 7a stacked on each other are directly used as the first terminals, and the plurality of second electrode sheets 5 stacked on each other are directly used as the second terminals. However, as shown in the second or third embodiment, a part of the first current collector foil exposed portion 7a left by cutting off a part of each first current collector foil exposed portion 7a is used as the first current collector foil exposed portion 7a. It may be a terminal. Moreover, it is good also considering the part of the 1st current collection foil exposure part 9a left by cutting off a part of each 2nd current collection foil exposure part 9a as a 2nd terminal.

また、上記の例では、セパレータ６が第１及び第２の密閉用樹脂１１，１２のいずれかとまとめて熱融着されている構成が、第１の電極シート４、第２の電極シート５及びセパレータ６が巻かれて構成された実施の形態１における積層体に適用されているが、第１の電極シート４、第２の電極シート５及びセパレータ６が折り畳まれて構成された実施の形態４における積層体に、セパレータ６が第１及び第２の密閉用樹脂１１，１２のいずれかとまとめて熱融着されている構成を適用してもよい。また、複数の第１の電極シート４と複数の第２の電極シート５とがセパレータ６を挟みながら交互に重ねられて構成された実施の形態５における積層体に、セパレータ６が第１及び第２の密閉用樹脂１１，１２のいずれかとまとめて熱融着されている構成を適用してもよい。   In the above example, the configuration in which the separator 6 is heat-sealed together with one of the first and second sealing resins 11 and 12 is the first electrode sheet 4, the second electrode sheet 5, and Although applied to the laminated body in Embodiment 1 configured by winding the separator 6, Embodiment 4 in which the first electrode sheet 4, the second electrode sheet 5, and the separator 6 are configured to be folded is used. A configuration in which the separator 6 is heat-sealed together with one of the first and second sealing resins 11 and 12 may be applied to the laminate in FIG. In addition, the separator 6 includes the first and first separators in the laminated body according to the fifth embodiment in which the plurality of first electrode sheets 4 and the plurality of second electrode sheets 5 are alternately stacked with the separator 6 interposed therebetween. A configuration may be applied in which any of the two sealing resins 11 and 12 is heat-sealed together.

また、各上記実施の形態では、第１の密閉用樹脂１１が第１の集電箔露出部７ａの両面に設けられているが、積層体とされている状態で第１の密閉用樹脂１１が第１の集電箔露出部７ａ間に介在するのであれば、第１の集電箔露出部７ａの片面にのみ第１の密閉用樹脂１１を設けてもよい。また、各上記実施の形態では、第２の密閉用樹脂１２が第２の集電箔露出部９ａの両面に設けられているが、積層体とされた状態で第２の密閉用樹脂１２が第２の集電箔露出部９ａ間に介在するのであれば、第２の集電箔露出部９ａの片面にのみ第２の密閉用樹脂１２を設けてもよい。   In each of the above embodiments, the first sealing resin 11 is provided on both surfaces of the first current collector foil exposed portion 7a. However, the first sealing resin 11 is in a state of being a laminated body. Is interposed between the first current collector foil exposed portions 7a, the first sealing resin 11 may be provided only on one surface of the first current collector foil exposed portion 7a. Further, in each of the above embodiments, the second sealing resin 12 is provided on both surfaces of the second current collector foil exposed portion 9a, but the second sealing resin 12 is in a laminated state. As long as it is interposed between the second current collector foil exposed portions 9a, the second sealing resin 12 may be provided only on one surface of the second current collector foil exposed portion 9a.

また、各上記実施の形態では、蓄電デバイス本体２がチューブ状の外装フィルム３内に収容されるようになっているが、外装フィルム３の形状はこれに限定されない。例えば、２枚のシート状の外装フィルム間に蓄電デバイス本体２を配置して各外装フィルムで蓄電デバイス本体２を包むようにしてもよいし、蓄電デバイス本体２のスペースをあらかじめ形成しておいたカップ状の外装容器内に蓄電デバイス本体２を配置して外装フィルムで外装容器の開口を塞ぐようにしてもよい。   Moreover, in each said embodiment, although the electrical storage device main body 2 is accommodated in the tube-shaped exterior film 3, the shape of the exterior film 3 is not limited to this. For example, the electricity storage device body 2 may be disposed between two sheet-like exterior films so that each exterior film wraps the electricity storage device body 2, or a cup shape in which a space for the electricity storage device body 2 is formed in advance. The power storage device main body 2 may be arranged in the outer packaging container and the opening of the outer packaging container may be closed with the exterior film.

１ 蓄電デバイス、２ 蓄電デバイス本体、３ 外装フィルム（外装材）、４ 第１の電極シート（第１の電極形成体）、５ 第２の電極シート（第２の電極形成体）、６ セパレータ、７ 第１の集電箔、７ａ 第１の集電箔露出部、８ 第１の電極、９ 第２の集電箔、９ａ 第２の集電箔露出部、１０ 第２の電極、１１ 第１の密閉用樹脂、１２ 第２の密閉用樹脂。   DESCRIPTION OF SYMBOLS 1 Power storage device, 2 Power storage device main body, 3 Exterior film (exterior material), 4 1st electrode sheet (1st electrode formation body), 5 2nd electrode sheet (2nd electrode formation body), 6 Separator, 7 1st current collection foil, 7a 1st current collection foil exposure part, 8 1st electrode, 9 2nd current collection foil, 9a 2nd current collection foil exposure part, 10 2nd electrode, 11 1st 1 sealing resin, 12 second sealing resin.

Claims (5)

第１の集電箔と上記第１の集電箔の一部である第１の集電箔露出部を避けて上記第１の集電箔に設けられた第１の電極とを含む第１の電極形成体と、第２の集電箔と上記第２の集電箔の一部である第２の集電箔露出部を避けて上記第２の集電箔に設けられた第２の電極とを含む第２の電極形成体と、上記第１及び第２の電極間に挟まれ、上記第１及び第２の電極間の短絡を防止するセパレータとを有する蓄電デバイス本体、
上記第１の集電箔露出部に設けられ、互いに重なる上記第１の集電箔露出部間を熱融着により固定する第１の密閉用樹脂、
上記第２の集電箔露出部に設けられ、互いに重なる上記第２の集電箔露出部間を熱融着により固定する第２の密閉用樹脂、及び
上記蓄電デバイス本体を電解液に浸した状態で収容する外装材
を備え、
上記第１及び第２の集電箔露出部は、上記外装材外へ端子として露出しており、
上記セパレータは、上記第１及び第２の密閉用樹脂のいずれかとまとめて熱融着されていることを特徴とする蓄電デバイス。 A first current collecting foil and a first electrode provided on the first current collecting foil so as to avoid the exposed portion of the first current collecting foil that is a part of the first current collecting foil; The second current collector foil, the second current collector foil, and the second current collector foil provided on the second current collector foil while avoiding the second current collector foil exposed portion which is a part of the second current collector foil An electricity storage device body comprising: a second electrode forming body including an electrode; and a separator sandwiched between the first and second electrodes to prevent a short circuit between the first and second electrodes ;
A first sealing resin which is provided in the first current collector foil exposed portion and which fixes the first current collector foil exposed portions overlapping each other by heat fusion;
A second sealing resin that is provided in the second current collector foil exposed portion and that fixes between the second current collector foil exposed portions that overlap each other by thermal fusion, and the power storage device main body are immersed in an electrolytic solution. With exterior materials to be housed in a state,
The first and second current collector foil exposed portions are exposed as terminals outside the exterior material ,
The electricity storage device , wherein the separator is heat-sealed together with one of the first and second sealing resins . 上記第１の集電箔露出部は帯状の上記第１の集電箔の長さ方向に沿って延び、
上記第２の集電箔露出部は帯状の上記第２の集電箔の長さ方向に沿って延びており、
上記蓄電デバイス本体は、上記第１の電極形成体、上記第２の電極形成体及び上記セパレータが上記第１及び第２の集電箔の長さ方向について巻かれることにより構成された積層体となっていることを特徴とする請求項１に記載の蓄電デバイス。 The first current collector foil exposed portion extends along the length direction of the band-shaped first current collector foil,
The second current collector foil exposed portion extends along the length direction of the strip-shaped second current collector foil,
The power storage device body includes a laminated body configured by winding the first electrode forming body, the second electrode forming body, and the separator in the length direction of the first and second current collector foils. The electrical storage device according to claim 1, wherein 上記第１の集電箔露出部は帯状の上記第１の集電箔の長さ方向に沿って延び、
上記第２の集電箔露出部は帯状の上記第２の集電箔の長さ方向に沿って延びており、
上記蓄電デバイス本体は、上記第１の電極形成体、上記第２の電極形成体及び上記セパレータが上記第１及び第２の集電箔の長さ方向について山折り及び谷折りを繰り返して折り畳まれることにより構成された積層体となっていることを特徴とする請求項１に記載の蓄電デバイス。 The first current collector foil exposed portion extends along the length direction of the band-shaped first current collector foil,
The second current collector foil exposed portion extends along the length direction of the strip-shaped second current collector foil,
The power storage device body is folded in such a manner that the first electrode forming body, the second electrode forming body, and the separator are repeatedly folded in a mountain and valley in the length direction of the first and second current collector foils. The power storage device according to claim 1, wherein the power storage device is a laminated body constituted by the above. 上記蓄電デバイス本体は、複数の上記第１の電極形成体と複数の上記第２の電極形成体とがセパレータを挟みながら交互に重ねられることにより構成された積層体となっていることを特徴とする請求項１に記載の蓄電デバイス。   The power storage device main body is a laminate configured by alternately stacking a plurality of the first electrode forming bodies and a plurality of the second electrode forming bodies with a separator interposed therebetween. The power storage device according to claim 1. 上記第１及び第２の集電箔露出部の少なくともいずれかは、一部が切り取られることにより所定の形状とされていることを特徴とする請求項１乃至請求項４のいずれか１項に記載の蓄電デバイス。   5. The device according to claim 1, wherein at least one of the first and second current collector foil exposed portions has a predetermined shape by being partially cut off. 6. The electricity storage device described.
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