JP2018055904A - Electrochemical cell and manufacturing method of the electrochemical cell - Google Patents

Electrochemical cell and manufacturing method of the electrochemical cell Download PDF

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JP2018055904A
JP2018055904A JP2016189183A JP2016189183A JP2018055904A JP 2018055904 A JP2018055904 A JP 2018055904A JP 2016189183 A JP2016189183 A JP 2016189183A JP 2016189183 A JP2016189183 A JP 2016189183A JP 2018055904 A JP2018055904 A JP 2018055904A
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positive electrode
negative electrode
active material
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tabs
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和美 田中
Kazumi Tanaka
和美 田中
渡邊　俊二
Shunji Watanabe
俊二 渡邊
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Seiko Instruments Inc
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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
    • 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
    • Y02E60/13—Energy storage using capacitors
    • 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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Abstract

PROBLEM TO BE SOLVED: To provide an electrochemical cell capable of reducing the number of components.SOLUTION: A battery comprises an electrode body 10 wound in a winding axle direction in a state where a positive electrode body 12 having a positive electrode collector 15 and a negative electrode body 13 having a negative electrode collector 18 are laminated through a separator 14. The positive electrode collector 15 includes: a positive electrode coating part 21 holding a positive electrode active material on a surface; and a plurality of positive electrode tabs 22 that is integrally formed with the positive electrode coating part 21 and is projected from an end surface of one side in an axial direction of a wining axis of the electrode body 10. The negative electrode collector 18 includes: a negative electrode coating part 23 holding a negative electrode active material on the surface; and a plurality of negative electrode tabs 24 that is integrally formed with the negative electrode coating part 23 and is projected from the end surface of one side in the axial direction of the wining axis of the electrode body 10.SELECTED DRAWING: Figure 5

Description

本発明は、電気化学セルおよび電気化学セルの製造方法に関するものである。   The present invention relates to an electrochemical cell and a method for producing the electrochemical cell.

非水電解質二次電池、電気二重層キャパシタ等の電気化学セルは、外装容器の内部に電極体を備えた構成となっている。電極体は、セパレータを介して正極体および負極体を交互に積層することで形成されている。また、正極体および負極体それぞれには、タブが接続されている。例えば、特許文献１に記載の電気化学セルは、正極板（正極体）および負極板（負極体）がその間にセパレータを介して対向配置され、その状態をもって捲回されてなる電極体を備えている。さらに、特許文献１に記載の電気化学セルでは、正極板および負極板それぞれに別部材の一対のタブが取り付けられている。   Electrochemical cells such as non-aqueous electrolyte secondary batteries and electric double layer capacitors have a configuration in which an electrode body is provided inside an outer container. The electrode body is formed by alternately laminating positive electrode bodies and negative electrode bodies via separators. Further, a tab is connected to each of the positive electrode body and the negative electrode body. For example, the electrochemical cell described in Patent Document 1 includes an electrode body in which a positive electrode plate (positive electrode body) and a negative electrode plate (negative electrode body) are arranged to face each other with a separator interposed therebetween and wound in that state. Yes. Furthermore, in the electrochemical cell described in Patent Document 1, a pair of tabs as separate members are attached to each of the positive electrode plate and the negative electrode plate.

特開２００５−２４３５２４号公報JP-A-2005-243524

従来技術において、正極体および負極体に対してタブを超音波溶接により取り付けると、タブと正極体および負極体との接続部には突起が形成される。このため、接続部の突起によりセパレータが傷つくことを防止するために、接続部を絶縁テープにより表裏を被覆する必要があり、部品点数が増加するという課題がある。   In the prior art, when the tab is attached to the positive electrode body and the negative electrode body by ultrasonic welding, a projection is formed at the connecting portion between the tab, the positive electrode body, and the negative electrode body. For this reason, in order to prevent a separator from being damaged by the protrusion of a connection part, it is necessary to coat | cover the connection part with an insulating tape, and there exists a subject that a number of parts increases.

そこで本発明は、部品点数を削減できる電気化学セルおよび電気化学セルの製造方法を提供するものである。   Therefore, the present invention provides an electrochemical cell and a method for manufacturing the electrochemical cell that can reduce the number of parts.

本発明の電気化学セルは、正極集電体を有する正極体と、負極集電体を有する負極体と、がセパレータを介して積層された状態で、捲回軸回りに捲回された電極体を備え、前記正極集電体は、表面に正極活物質を保持する正極塗工部と、前記正極塗工部と一体形成され、前記電極体の前記捲回軸の軸方向における一方側の端面から突出する複数の正極タブと、を有し、前記負極集電体は、表面に負極活物質を保持する負極塗工部と、前記負極塗工部と一体形成され、前記電極体の前記軸方向における前記一方側の端面から突出する複数の負極タブと、を有する、ことを特徴とする。   The electrochemical cell of the present invention comprises an electrode body wound around a winding axis in a state in which a positive electrode body having a positive electrode current collector and a negative electrode body having a negative electrode current collector are laminated via a separator. The positive electrode current collector is formed integrally with the positive electrode coating portion, the positive electrode coating portion holding the positive electrode active material on the surface, and one end face in the axial direction of the winding axis of the electrode body A plurality of positive electrode tabs projecting from the negative electrode current collector, wherein the negative electrode current collector is formed integrally with the negative electrode coating part holding the negative electrode active material on the surface and the negative electrode coating part, and the shaft of the electrode body A plurality of negative electrode tabs protruding from the end face on the one side in the direction.

本発明によれば、正極集電体が正極活物質を保持する正極塗工部と一体形成された正極タブを有し、負極集電体が負極活物質を保持する負極塗工部と一体形成された負極タブを有しているので、従来技術のように正極集電体および負極集電体とは別部材の正極タブおよび負極タブを用いる必要がないため、電気化学セルの部品点数を削減できる。また、複数の正極タブ、および複数の負極タブを有するので、正極タブおよび負極タブがそれぞれ１個ずつ設けられた構成と比較して、電気化学セルの電気抵抗値を低減できる。   According to the present invention, the positive electrode current collector has a positive electrode tab integrally formed with the positive electrode coating part holding the positive electrode active material, and the negative electrode current collector is integrally formed with the negative electrode coating part holding the negative electrode active material Because there is no negative electrode tab, there is no need to use a positive electrode tab and a negative electrode tab that are separate from the positive electrode current collector and negative electrode current collector as in the prior art, reducing the number of parts in the electrochemical cell it can. Moreover, since it has a plurality of positive electrode tabs and a plurality of negative electrode tabs, the electric resistance value of the electrochemical cell can be reduced as compared with a configuration in which one positive electrode tab and one negative electrode tab are provided.

上記の電気化学セルにおいて、前記複数の正極タブのうち前記電極体の最も外周側に位置する前記正極タブは、他の前記正極タブよりも前記軸方向に長く形成され、前記複数の負極タブのうち前記電極体の最も外周側に位置する前記負極タブは、他の前記負極タブよりも前記軸方向に長く形成されている、ことが望ましい。   Said electrochemical cell WHEREIN: The said positive electrode tab located in the outermost peripheral side of the said electrode body among these positive electrode tabs is formed longer in the said axial direction than the said other positive electrode tab, Among these, it is desirable that the negative electrode tab located on the outermost peripheral side of the electrode body is formed longer in the axial direction than the other negative electrode tabs.

複数の正極タブを重ね合わせて超音波溶着等で束ねる構成とする場合、各正極タブは、内周側に寄せられた状態で束ねられることがある。この場合には、各正極タブの軸方向における長さは、内周側に向かって寄せた距離に応じて、束ねる前の状態よりも短くなる。負極タブについても同様である。
本発明によれば、最も外周側に位置する正極タブは、他の正極タブよりも軸方向に長く形成されているので、各正極タブを内周側に寄せる場合に、最も外周側に位置する正極タブと最も内周側に位置する正極タブとの間に他の正極タブを挟み込ませることができる。よって、各正極タブを確実に重ね合わせることができる。負極タブについても同様である。
したがって、複数の正極タブ、および複数の負極タブを、それぞれ確実に重ね合わせて束ねることができ、高品質な電気化学セルとすることができる。 When a plurality of positive electrode tabs are stacked and bundled by ultrasonic welding or the like, the respective positive electrode tabs may be bundled in a state of being brought closer to the inner peripheral side. In this case, the length of each positive electrode tab in the axial direction is shorter than the state before being bundled, depending on the distance approaching the inner peripheral side. The same applies to the negative electrode tab.
According to the present invention, since the positive electrode tab located on the outermost peripheral side is formed longer in the axial direction than the other positive electrode tabs, the positive electrode tab is located on the outermost peripheral side when the positive electrode tabs are brought closer to the inner peripheral side. Another positive electrode tab can be sandwiched between the positive electrode tab and the positive electrode tab located on the innermost peripheral side. Therefore, each positive electrode tab can be reliably overlapped. The same applies to the negative electrode tab.
Therefore, a plurality of positive electrode tabs and a plurality of negative electrode tabs can be reliably overlapped and bundled, and a high-quality electrochemical cell can be obtained.

上記の電気化学セルにおいて、前記正極体が展開された状態における前記複数の正極タブの配列間隔は、前記電極体の内周側から外周側に向かうに従い広く設けられ、前記負極体が展開された状態における前記複数の負極タブの配列間隔は、前記電極体の内周側から外周側に向かうに従い広く設けられている、ことが望ましい。   In the electrochemical cell, the arrangement interval of the plurality of positive electrode tabs in a state in which the positive electrode body is expanded is widely provided from the inner peripheral side to the outer peripheral side of the electrode body, and the negative electrode body is expanded. It is desirable that the arrangement interval of the plurality of negative electrode tabs in a state is wider as it goes from the inner circumference side to the outer circumference side of the electrode body.

電極体は、正極体と負極体とを捲回軸回りに捲回してなるので、複数の正極タブを重ね合わせる場合には、正極体が展開された状態において、複数の正極タブの配列間隔を内周側から外周側に向かうに従い順次広くする必要がある。負極タブについても同様である。
本発明によれば、正極タブの配列間隔は、電極体の内周側から外周側に向かうに従い広く設けられているので、複数の正極タブを重ね合わせることができる。負極タブについても同様である。
したがって、複数の正極タブ、および複数の負極タブを、それぞれ確実に重ね合わせることができ、高品質な電気化学セルとすることができる。 Since the electrode body is formed by winding the positive electrode body and the negative electrode body around the winding axis, when the plurality of positive electrode tabs are overlapped, the arrangement interval of the plurality of positive electrode tabs is set in a state where the positive electrode bodies are deployed. It is necessary to increase the width sequentially from the inner circumference side toward the outer circumference side. The same applies to the negative electrode tab.
According to the present invention, the arrangement interval of the positive electrode tabs is widened from the inner peripheral side to the outer peripheral side of the electrode body, so that a plurality of positive electrode tabs can be overlapped. The same applies to the negative electrode tab.
Therefore, a plurality of positive electrode tabs and a plurality of negative electrode tabs can be reliably overlapped with each other, and a high-quality electrochemical cell can be obtained.

上記の電気化学セルにおいて、前記複数の正極タブのうち前記電極体の最も外周側に位置する前記正極タブは、他の前記正極タブよりも幅広に形成され、前記複数の負極タブのうち前記電極体の最も外周側に位置する前記負極タブは、他の前記負極タブよりも幅広に形成されている、ことが望ましい。   Said electrochemical cell WHEREIN: The said positive electrode tab located in the outermost periphery side of the said electrode body among these positive electrode tabs is formed wider than the said other positive electrode tab, The said electrode among these negative electrode tabs The negative electrode tab located on the outermost peripheral side of the body is desirably formed wider than the other negative electrode tabs.

電極体は、正極体と負極体とを捲回軸回りに捲回してなるので、捲回時のテンションの変化等により、正極タブおよび負極タブの捲回軸回りの周方向における位置が内周側から外周側に向かうに従い所望の位置からずれやすくなる。
本発明によれば、最も外周側に位置する正極タブは、他の正極タブよりも幅広に形成されているので、捲回後に所望の位置からずれた場合であっても、他の正極タブと重なる部分を設けやすくすることができる。負極タブについても同様である。
したがって、複数の正極タブ、および複数の負極タブを、それぞれ確実に重ね合わせることができ、高品質な電気化学セルとすることができる。 Since the electrode body is formed by winding the positive electrode body and the negative electrode body around the winding axis, the positions of the positive electrode tab and the negative electrode tab in the circumferential direction around the winding axis are changed due to changes in tension during winding. It tends to shift from a desired position as it goes from the side to the outer peripheral side.
According to the present invention, since the positive electrode tab located on the outermost peripheral side is formed wider than the other positive electrode tabs, even if the positive electrode tab is displaced from a desired position after winding, An overlapping portion can be easily provided. The same applies to the negative electrode tab.
Therefore, a plurality of positive electrode tabs and a plurality of negative electrode tabs can be reliably overlapped with each other, and a high-quality electrochemical cell can be obtained.

本発明の電気化学セルの製造方法は、上記の電気化学セルの製造方法であって、正極活物質塗工領域および正極活物質未塗工領域を有する金属箔により形成された正極用シート部材を切断し、前記正極活物質塗工領域および前記正極活物質未塗工領域を切り出すことで、前記正極体を形成する正極体形成工程と、負極活物質塗工領域および負極活物質未塗工領域を有する金属箔により形成された負極用シート部材を切断し、前記負極活物質塗工領域および前記負極活物質未塗工領域を切り出すことで、前記負極体を形成する負極体形成工程と、を備えることを特徴とする。   The electrochemical cell manufacturing method of the present invention is the above-described electrochemical cell manufacturing method, comprising: a positive electrode sheet member formed of a metal foil having a positive electrode active material coated region and a positive electrode active material uncoated region. Cutting the positive electrode active material coating region and the positive electrode active material uncoated region to form the positive electrode body, the negative electrode active material coating region, and the negative electrode active material uncoated region A negative electrode body forming step of forming the negative electrode body by cutting a negative electrode sheet member formed of a metal foil having a negative electrode active material coated region and a negative electrode active material uncoated region. It is characterized by providing.

本発明によれば、正極活物質未塗工領域を正極体の正極タブとし、負極活物質未塗工領域を負極体の負極タブとすることができる。このため、金属箔上の活物質を除去する工程を行うことなく、各タブがそれぞれ各塗工部と一体形成された正極体および負極体を形成することができる。したがって、電極体を容易に製造できる。   According to the present invention, the positive electrode active material uncoated region can be the positive electrode tab of the positive electrode body, and the negative electrode active material uncoated region can be the negative electrode tab of the negative electrode body. For this reason, without performing the process of removing the active material on metal foil, the positive electrode body and negative electrode body in which each tab was integrally formed with each coating part can be formed, respectively. Therefore, an electrode body can be manufactured easily.

上記の電気化学セルの製造方法において、前記正極用シート部材は、第１方向に沿って一様に延びる前記正極活物質塗工領域および前記正極活物質未塗工領域を備えるとともに、前記第１方向に直交する第２方向に沿う軸回りにロール状に巻かれ、前記負極用シート部材は、第３方向に沿って一様に延びる前記負極活物質塗工領域および前記負極活物質未塗工領域を備えるとともに、前記第３方向に直交する第４方向に沿う軸回りにロール状に巻かれ、前記正極体形成工程では、ロール状に巻かれた前記正極用シート部材を引き出しつつ切断し、前記負極体形成工程では、ロール状に巻かれた前記負極用シート部材を引き出しつつ切断する、ことが望ましい。   In the method for manufacturing an electrochemical cell, the positive electrode sheet member includes the positive electrode active material coating region and the positive electrode active material uncoated region that extend uniformly along a first direction, The negative electrode sheet member is wound around an axis along a second direction orthogonal to the direction, and the negative electrode sheet member extends uniformly along the third direction, and the negative electrode active material uncoated And having a region, wound in a roll shape around an axis along a fourth direction orthogonal to the third direction, and in the positive electrode body forming step, the positive electrode sheet member wound in a roll shape is cut while being pulled, In the negative electrode body forming step, it is preferable that the negative electrode sheet member wound in a roll is cut while being pulled out.

本発明によれば、正極用シート部材は、ロール状に巻かれた部分から第１方向に沿って引き出され、その引き出された部分には、正極活物質塗工領域および正極活物質未塗工領域が第１方向に沿って一様に延びた状態となるので、正極体形成工程では、複数の正極体を連続的に形成することができる。負極体形成工程についても同様である。したがって、製造効率の高い電気化学セルの製造方法を提供できる。   According to the present invention, the positive electrode sheet member is pulled out along the first direction from the portion wound in the roll shape, and the positive electrode active material coating region and the positive electrode active material uncoated are formed in the extracted portion. Since the region extends uniformly along the first direction, a plurality of positive electrode bodies can be formed continuously in the positive electrode body forming step. The same applies to the negative electrode body forming step. Therefore, the manufacturing method of the electrochemical cell with high manufacturing efficiency can be provided.

本発明によれば、正極集電体が正極活物質を保持する正極塗工部と一体形成された正極タブを有し、負極集電体が負極活物質を保持する負極塗工部と一体形成された負極タブを有しているので、従来技術のように正極集電体および負極集電体とは別部材の正極タブおよび負極タブを用いる必要がない。したがって、部品点数を削減できる電気化学セルを提供できる。   According to the present invention, the positive electrode current collector has a positive electrode tab integrally formed with the positive electrode coating part holding the positive electrode active material, and the negative electrode current collector is integrally formed with the negative electrode coating part holding the negative electrode active material Since the negative electrode tab is provided, it is not necessary to use the positive electrode tab and the negative electrode tab which are separate members from the positive electrode current collector and the negative electrode current collector as in the prior art. Therefore, an electrochemical cell that can reduce the number of parts can be provided.

実施形態の電池の斜視図である。It is a perspective view of the battery of an embodiment. 図１のＩＩ−ＩＩ線における部分断面図である。It is a fragmentary sectional view in the II-II line of FIG. 実施形態の電極体の斜視図である。It is a perspective view of the electrode body of an embodiment. 実施形態の電極体の展開状態における平面図である。It is a top view in the deployment state of the electrode body of an embodiment. 実施形態の電極体の分解斜視図である。It is a disassembled perspective view of the electrode body of embodiment. 実施形態の正極用シート部材の斜視図である。It is a perspective view of the sheet member for positive electrodes of an embodiment.

以下、本発明の実施形態を図面に基づいて説明する。なお、以下の説明では、電気化学セルとして、非水電解質二次電池の一種であるリチウムイオン二次電池（以下、単に「電池」という。）を例に挙げて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, a lithium ion secondary battery (hereinafter simply referred to as “battery”), which is a kind of non-aqueous electrolyte secondary battery, will be described as an example of an electrochemical cell.

図１は、実施形態の電池の斜視図である。図２は、図１のＩＩ−ＩＩ線における部分断面図である。
図１および図２に示すように、電池１は、外装容器２と、電解液等の非水電解質とともに外装容器２に収容された電極体１０と、を備えている。 FIG. 1 is a perspective view of the battery according to the embodiment. 2 is a partial cross-sectional view taken along line II-II in FIG.
As shown in FIGS. 1 and 2, the battery 1 includes an outer container 2 and an electrode body 10 accommodated in the outer container 2 together with a non-aqueous electrolyte such as an electrolytic solution.

外装容器２は、凹状に形成されたベース３と、ベース３の開口端面上に設けられたシールリング４と、シールリング４上に重ねられ、ベース３の内側を気密封止するリッド５と、を備えている。ベース３の内側における底面には、後述する正極タブ２２および負極タブ２４の位置に合せて一対の集電パッド６が並設されている。各集電パッド６は、ベース３の底部を貫通する貫通孔内に充填された一対の接続電極７それぞれを介して、ベース３の外面上に形成された一対の外部電極８それぞれに接続している。   The exterior container 2 includes a base 3 formed in a concave shape, a seal ring 4 provided on the opening end surface of the base 3, a lid 5 that is stacked on the seal ring 4 and hermetically seals the inside of the base 3, It has. A pair of current collecting pads 6 are juxtaposed on the bottom surface inside the base 3 in accordance with the positions of a positive electrode tab 22 and a negative electrode tab 24 described later. Each current collecting pad 6 is connected to a pair of external electrodes 8 formed on the outer surface of the base 3 via a pair of connection electrodes 7 filled in through holes penetrating the bottom of the base 3. Yes.

図３は、実施形態の電極体の斜視図である。図４は、実施形態の電極体の展開状態における平面図である。図５は、実施形態の電極体の分解斜視図である。
図３から図５に示すように、電極体１０は、横断面が長円状となる扁平された円柱状に形成されている。電極体１０は、正極体１２と、負極体１３と、セパレータ１４と、を備え、正極体１２と負極体１３とがセパレータ１４を介して積層された状態で捲回軸Ｐ回りに捲回されている。 FIG. 3 is a perspective view of the electrode body according to the embodiment. FIG. 4 is a plan view of the electrode body according to the embodiment in a developed state. FIG. 5 is an exploded perspective view of the electrode body according to the embodiment.
As shown in FIG. 3 to FIG. 5, the electrode body 10 is formed in a flattened columnar shape having an elliptical cross section. The electrode body 10 includes a positive electrode body 12, a negative electrode body 13, and a separator 14. ing.

図５に示すように、正極体１２は、シート状の正極集電体１５と、正極集電体１５に塗工された正極１６と、を有する。
正極集電体１５は、金属箔により形成されている。正極集電体１５を形成する材料としては、例えばアルミニウムやアルミニウム合金等を用いることができる。正極集電体１５は、表面に正極１６を保持する長尺の矩形状の正極塗工部２１と、正極塗工部２１と一体形成され、正極塗工部２１の一方の長辺から延出した複数（本実施形態では５個）の正極タブ２２と、を有する。なお、本実施形態で言う一体形成とは、複数の構成部材を単一部材（上記の例では金属箔）から連なるように一体的に形成することであり、個別に形成された複数の構成部材を接続することは含まない。 As shown in FIG. 5, the positive electrode body 12 includes a sheet-like positive electrode current collector 15 and a positive electrode 16 coated on the positive electrode current collector 15.
The positive electrode current collector 15 is formed of a metal foil. As a material for forming the positive electrode current collector 15, for example, aluminum or an aluminum alloy can be used. The positive electrode current collector 15 is formed integrally with a long rectangular positive electrode coating portion 21 that holds the positive electrode 16 on the surface and the positive electrode coating portion 21, and extends from one long side of the positive electrode coating portion 21. And a plurality (5 in this embodiment) of positive electrode tabs 22. In addition, the integral formation said by this embodiment is forming integrally several components so that it may continue from a single member (in the above-mentioned example, metal foil), and is a plurality of components formed individually. It does not include connecting.

正極塗工部２１は、例えば長さが３０〜１００ｍｍ、幅が２〜１０ｍｍ、厚さが８〜１５μｍ程度となっている。正極塗工部２１は、その短手方向が捲回軸Ｐ（図３参照）の軸方向（以下、単に「軸方向」という。）と一致するように配置されている。   The positive electrode coating portion 21 has, for example, a length of 30 to 100 mm, a width of 2 to 10 mm, and a thickness of about 8 to 15 μm. The positive electrode coating portion 21 is arranged such that the short direction thereof coincides with the axial direction of the winding axis P (see FIG. 3) (hereinafter simply referred to as “axial direction”).

複数の正極タブ２２は、矩形状に形成され、軸方向に沿って突出している。各正極タブ２２は、例えば軸方向における長さが２〜５ｍｍ、幅が１〜５ｍｍ程度であって、より電極体１０の内周側に位置する正極タブ２２よりも軸方向に長く、かつ幅広に形成されている。すなわち、複数の正極タブ２２のうち、電極体１０の最も外周側に位置する正極タブ２２は、他の正極タブ２２よりも長くかつ幅広に形成されている。正極体１２が展開された状態（図４および図５に示す状態）における複数の正極タブ２２の配列間隔Ｐ１（図４参照）は、例えば２〜８ｍｍ程度であって、電極体１０の内周側から外周側に向かうに従い広く設けられている。   The plurality of positive electrode tabs 22 are formed in a rectangular shape and protrude along the axial direction. Each positive electrode tab 22 is, for example, about 2 to 5 mm in length in the axial direction and about 1 to 5 mm in width, and is longer in the axial direction and wider than the positive electrode tab 22 located on the inner peripheral side of the electrode body 10. Is formed. That is, among the plurality of positive electrode tabs 22, the positive electrode tab 22 positioned on the outermost peripheral side of the electrode body 10 is formed longer and wider than the other positive electrode tabs 22. The arrangement interval P1 (see FIG. 4) of the plurality of positive electrode tabs 22 in a state where the positive electrode body 12 is unfolded (the state shown in FIGS. 4 and 5) is, for example, about 2 to 8 mm. Wider from the side toward the outer periphery.

正極１６は、正極活物質、導電助剤および結着材により形成されている。正極活物質は、例えば、コバルト酸リチウムやチタン酸リチウム、マンガン酸リチウム等のように、リチウムと遷移金属とを含む複合酸化物である。正極１６は、正極塗工部２１の両面における略全面に塗工されている。   The positive electrode 16 is formed of a positive electrode active material, a conductive additive, and a binder. The positive electrode active material is a composite oxide containing lithium and a transition metal, such as lithium cobaltate, lithium titanate, lithium manganate, and the like. The positive electrode 16 is coated on substantially the entire surface of both surfaces of the positive electrode coating unit 21.

負極体１３は、シート状の負極集電体１８と、負極集電体１８に塗工された負極１９と、を有する。
負極集電体１８は、金属箔により形成されている。負極集電体１８を形成する材料としては、例えば銅や銅合金、ニッケル、ステンレス等を用いることができる。負極集電体１８は、表面に負極１９を保持する長尺の矩形状の負極塗工部２３と、負極塗工部２３と一体形成され、負極塗工部２３の一方の長辺から延出した複数（本実施形態では６個）の負極タブ２４と、を有する。 The negative electrode body 13 includes a sheet-like negative electrode current collector 18 and a negative electrode 19 coated on the negative electrode current collector 18.
The negative electrode current collector 18 is formed of a metal foil. As a material for forming the negative electrode current collector 18, for example, copper, copper alloy, nickel, stainless steel, or the like can be used. The negative electrode current collector 18 is integrally formed with a long rectangular negative electrode coating portion 23 that holds the negative electrode 19 on the surface and the negative electrode coating portion 23, and extends from one long side of the negative electrode coating portion 23. A plurality of (six in this embodiment) negative electrode tabs 24.

負極塗工部２３は、長さおよび幅ともに、正極塗工部２１よりも僅かに大きくなっている。負極塗工部２３は、その短手方向が軸方向と一致するように配置されている。
複数の負極タブ２４は、矩形状に形成され、軸方向に沿って正極タブ２２と同じ側に突出している。各負極タブ２４は、正極タブ２２と同程度の大きさであって、より電極体１０の内周側に位置する負極タブ２４よりも軸方向に長く、かつ幅広に形成されている。すなわち、複数の負極タブ２４のうち、電極体１０の最も外周側に位置する負極タブ２４は、他の負極タブ２４よりも長くかつ幅広に形成されている。負極体１３が展開された状態（図４および図５に示す状態）における複数の負極タブ２４の配列間隔Ｐ２（図４参照）は、例えば２〜８ｍｍ程度であって、電極体１０の内周側から外周側に向かうに従い広く設けられている。 The negative electrode coating part 23 is slightly larger than the positive electrode coating part 21 in both length and width. The negative electrode coating part 23 is arranged so that its short direction coincides with the axial direction.
The plurality of negative electrode tabs 24 are formed in a rectangular shape and protrude on the same side as the positive electrode tab 22 along the axial direction. Each negative electrode tab 24 is approximately the same size as the positive electrode tab 22, and is longer and wider in the axial direction than the negative electrode tab 24 positioned on the inner peripheral side of the electrode body 10. That is, among the plurality of negative electrode tabs 24, the negative electrode tab 24 positioned on the outermost peripheral side of the electrode body 10 is formed longer and wider than the other negative electrode tabs 24. The arrangement interval P2 (see FIG. 4) of the plurality of negative electrode tabs 24 in the state where the negative electrode body 13 is unfolded (the state shown in FIGS. 4 and 5) is, for example, about 2 to 8 mm. Wider from the side toward the outer periphery.

負極１９は、負極活物質、導電助剤および結着材により形成されている。負極活物質は、例えば、シリコン酸化物やグラファイト、ハードカーボン、チタン酸リチウム、ＬｉＡｌ等である。負極１９は、負極塗工部２３の両面における略全面に塗工されている。   The negative electrode 19 is formed of a negative electrode active material, a conductive additive, and a binder. Examples of the negative electrode active material include silicon oxide, graphite, hard carbon, lithium titanate, and LiAl. The negative electrode 19 is coated on substantially the entire surface of both surfaces of the negative electrode coating portion 23.

セパレータ１４は、長尺の矩形シート状に形成されている。セパレータ１４は、リチウムイオンを通す特性を有し、例えば、ポリオレフィン製の樹脂ポーラスフィルム、ガラス製不織布、樹脂製不織布等により形成されている。セパレータ１４は、長さが負極塗工部２３の長さの２倍以上、幅が負極塗工部２３の幅以上となっている。セパレータ１４は、その長手方向における中間部分において折曲され、正極体１２のうち正極１６が塗工された領域を挟み込むように配置されている。セパレータ１４は、負極体１３のうち負極１９が塗工された領域の全体と重なるように配置されている（図４参照）。   The separator 14 is formed in a long rectangular sheet shape. The separator 14 has a property of allowing lithium ions to pass through, and is formed of, for example, a polyolefin resin porous film, a glass nonwoven fabric, a resin nonwoven fabric, or the like. The separator 14 has a length that is at least twice the length of the negative electrode coating portion 23 and a width that is greater than or equal to the width of the negative electrode coating portion 23. The separator 14 is bent at an intermediate portion in the longitudinal direction, and is disposed so as to sandwich a region of the positive electrode body 12 where the positive electrode 16 is applied. The separator 14 is arrange | positioned so that the whole area | region where the negative electrode 19 was coated among the negative electrode bodies 13 may overlap (refer FIG. 4).

図３に示すように、上述した正極体１２、負極体１３およびセパレータ１４が積層された状態で捲回されてなる電極体１０では、複数の正極タブ２２が、電極体１０における軸方向一端面から突出して互いに重なるように設けられ、超音波溶着等により束ねられている。複数の正極タブ２２は、内周側に寄せられた状態で束ねられている。また、複数の負極タブ２４は、電極体１０における軸方向一端面から突出して互いに重なるように設けられ、超音波溶着等により束ねられている。複数の負極タブ２４は、内周側に寄せられた状態で束ねられている。複数の正極タブ２２と、複数の負極タブ２４と、は互いに離間した位置に設けられ、互いの接触を防止している。図２に示すように、束ねられた複数の正極タブ２２は、外装容器２の一方の集電パッド６に、超音波溶着等により接続されている。束ねられた複数の負極タブ２４は、外装容器２の他方の集電パッド６に、超音波溶着等により接続されている。   As shown in FIG. 3, in the electrode body 10 that is wound in a state where the positive electrode body 12, the negative electrode body 13, and the separator 14 are stacked, a plurality of positive electrode tabs 22 are arranged on one end surface in the axial direction of the electrode body 10. And are bundled by ultrasonic welding or the like. The plurality of positive electrode tabs 22 are bundled in a state of being brought closer to the inner peripheral side. The plurality of negative electrode tabs 24 are provided so as to protrude from one end face in the axial direction of the electrode body 10 and overlap each other, and are bundled by ultrasonic welding or the like. The plurality of negative electrode tabs 24 are bundled in a state of being brought closer to the inner peripheral side. The plurality of positive electrode tabs 22 and the plurality of negative electrode tabs 24 are provided at positions separated from each other to prevent mutual contact. As shown in FIG. 2, the bundled positive electrode tabs 22 are connected to one current collecting pad 6 of the outer container 2 by ultrasonic welding or the like. The bundled negative electrode tabs 24 are connected to the other current collecting pad 6 of the outer container 2 by ultrasonic welding or the like.

以下、電池１の製造方法について説明する。なお、以下の説明における電池１の各構成部品の符号については、図１から図５を参照されたい。
電池１の製造方法は、正極体形成工程と、負極体形成工程と、捲回工程と、タブ接続工程と、封止工程と、を備えている。 Hereinafter, a method for manufacturing the battery 1 will be described. In addition, refer to FIGS. 1 to 5 for the reference numerals of the components of the battery 1 in the following description.
The manufacturing method of the battery 1 includes a positive electrode body forming step, a negative electrode body forming step, a winding step, a tab connection step, and a sealing step.

図６は、実施形態の正極用シート部材の斜視図である。
最初に正極体形成工程を行う。正極体形成工程では、図６に示す正極用シート部材３０を切断することで、正極体１２を形成する。
正極用シート部材３０は、上述した正極活物質が塗工された正極活物質塗工領域Ｒ１、および正極活物質が塗工されていない正極活物質未塗工領域Ｒ２を有する金属箔により形成されている。正極用シート部材３０を形成する金属箔は、正極集電体１５の基材であって、例えばアルミニウムやアルミニウム合金等により形成されている。正極活物質塗工領域Ｒ１および正極活物質未塗工領域Ｒ２は、それぞれ金属箔の延在する第１方向に沿って一様に延びるとともに、金属箔の面方向のうち第１方向に直交する第２方向に交互に並んで形成されている。正極用シート部材３０は、第２方向に沿う軸回りにロール状に巻かれている。 FIG. 6 is a perspective view of the positive electrode sheet member of the embodiment.
First, a positive electrode body forming step is performed. In the positive electrode body forming step, the positive electrode body 12 is formed by cutting the positive electrode sheet member 30 shown in FIG.
The positive electrode sheet member 30 is formed of a metal foil having a positive electrode active material coated region R1 coated with the positive electrode active material and a positive electrode active material uncoated region R2 coated with no positive electrode active material. ing. The metal foil forming the positive electrode sheet member 30 is a base material of the positive electrode current collector 15 and is formed of, for example, aluminum or an aluminum alloy. The positive electrode active material coated region R1 and the positive electrode active material uncoated region R2 extend uniformly along the first direction in which the metal foil extends, and are orthogonal to the first direction among the surface directions of the metal foil. They are formed alternately in the second direction. The positive electrode sheet member 30 is wound in a roll shape around an axis along the second direction.

正極体形成工程では、例えば図６に示す２点鎖線に沿って、正極用シート部材３０をレーザーにより切断し、正極活物質塗工領域Ｒ１および正極活物質未塗工領域Ｒ２を一体的に切り出すことで、正極体１２を形成する。このとき、レーザーを第２方向に動かしながら、ロール状に巻かれた正極用シート部材３０を第１方向に引き出しつつ連続的に切断する。
これにより、切断後の正極活物質塗工領域Ｒ１が正極塗工部２１および正極１６となるとともに、正極活物質未塗工領域Ｒ２が正極タブ２２となり、正極体１２が形成される。 In the positive electrode body forming step, for example, the positive electrode sheet member 30 is cut with a laser along the two-dot chain line shown in FIG. 6 to integrally cut out the positive electrode active material coating region R1 and the positive electrode active material uncoated region R2. Thus, the positive electrode body 12 is formed. At this time, the positive electrode sheet member 30 wound in a roll shape is continuously cut while being pulled in the first direction while moving the laser in the second direction.
As a result, the positive electrode active material coated region R1 after cutting becomes the positive electrode coated portion 21 and the positive electrode 16, and the positive electrode active material uncoated region R2 becomes the positive electrode tab 22, and the positive electrode body 12 is formed.

次に負極体形成工程を行う。負極体形成工程は、正極体形成工程と同様の方法により、負極体１３を形成する。すなわち、上述した負極活物質が塗工された負極活物質塗工領域、および負極活物質が塗工されていない負極活物質未塗工領域を有する金属箔により形成され、ロール状に巻かれた負極用シート部材をレーザーにより切断することで、負極体１３を形成する。   Next, a negative electrode body forming step is performed. In the negative electrode body forming step, the negative electrode body 13 is formed by the same method as the positive electrode body forming step. That is, the negative electrode active material coated region coated with the negative electrode active material described above and a negative electrode active material uncoated region not coated with the negative electrode active material are formed of a metal foil and wound in a roll shape. The negative electrode sheet 13 is formed by cutting the negative electrode sheet member with a laser.

次に捲回工程を行う。捲回工程では、セパレータ１４を介して正極体１２および負極体１３を積層した状態（図４に示す状態）で捲回する。これにより、各タブ２２，２４が延出した電極体１０が形成される。   Next, a winding process is performed. In the winding step, winding is performed in a state where the positive electrode body 12 and the negative electrode body 13 are laminated via the separator 14 (the state shown in FIG. 4). Thereby, the electrode body 10 in which the tabs 22 and 24 extend is formed.

次にタブ接続工程を行う。タブ接続工程では、複数の正極タブ２２、および複数の負極タブ２４をそれぞれ重ね合わせた状態で超音波溶着等により束ねるとともに、ベース３の内側が開放された外装容器２の集電パッド６に、各タブ２２，２４をそれぞれ超音波溶着等により接続する。   Next, a tab connection process is performed. In the tab connection step, the plurality of positive electrode tabs 22 and the plurality of negative electrode tabs 24 are bundled by ultrasonic welding or the like in a state where they are overlapped, and the current collection pad 6 of the outer container 2 with the inner side of the base 3 opened, The tabs 22 and 24 are connected by ultrasonic welding or the like.

次に封止工程を行う。封止工程では、電極体１０を外装容器２内に収容する。より詳細に、まず各タブ２２，２４が集電パッド６に接続された電極体１０を、ベース３の内側に収容する。このとき、電解液等の非水電解質を電極体１０とともにベース３の内側に充填する。続いて、シールリング４を挟んでリッド５をベース３上に重ね合わせ、シールリング４に対してリッド５を溶接等により接合し、ベース３の内側を気密に封止する。
以上により、電池１の製造が完了する。 Next, a sealing process is performed. In the sealing step, the electrode body 10 is accommodated in the outer container 2. In more detail, first, the electrode body 10 in which the tabs 22 and 24 are connected to the current collecting pad 6 is accommodated inside the base 3. At this time, a nonaqueous electrolyte such as an electrolytic solution is filled inside the base 3 together with the electrode body 10. Subsequently, the lid 5 is overlapped on the base 3 with the seal ring 4 interposed therebetween, and the lid 5 is joined to the seal ring 4 by welding or the like, so that the inside of the base 3 is hermetically sealed.
Thus, the manufacture of the battery 1 is completed.

このように、本実施形態では、正極集電体１５が正極活物質（正極１６）を保持する正極塗工部２１と一体形成された正極タブ２２を有し、負極集電体１８が負極活物質（負極１９）を保持する負極塗工部２３と一体形成された負極タブ２４を有する構成とした。
この構成によれば、従来技術のように正極集電体１５および負極集電体１８とは別部材の正極タブおよび負極タブを用いる必要がない。さらに、正極集電体および負極体集電体に対してタブを溶接等により取り付ける必要がなくなるので、従来技術のようにタブと正極体および負極体との接続部に、セパレータへの傷つき防止のため絶縁テープを貼る必要がなくなる。よって、別部材の正極タブおよび負極タブ、並びに絶縁テープを削減することができる。したがって、部品点数を削減できる電池１を提供できる。 Thus, in the present embodiment, the positive electrode current collector 15 has the positive electrode tab 22 integrally formed with the positive electrode coating part 21 that holds the positive electrode active material (positive electrode 16), and the negative electrode current collector 18 has the negative electrode active material. A negative electrode tab 24 formed integrally with a negative electrode coating portion 23 for holding a substance (negative electrode 19) was used.
According to this configuration, it is not necessary to use the positive electrode tab and the negative electrode tab which are separate members from the positive electrode current collector 15 and the negative electrode current collector 18 as in the prior art. Furthermore, since it is not necessary to attach a tab to the positive electrode current collector and the negative electrode current collector by welding or the like, it is possible to prevent damage to the separator at the connecting portion between the tab and the positive electrode body and the negative electrode body as in the prior art. Therefore, it is not necessary to apply insulating tape. Therefore, the positive electrode tab and negative electrode tab of another member, and an insulating tape can be reduced. Therefore, the battery 1 that can reduce the number of parts can be provided.

しかも、正極タブ２２が複数設けられているので、正極タブが１個設けられた構成と比較して、正極塗工部２１と正極タブ２２との間の電気抵抗値を低減させることができる。負極タブ２４についても同様である。したがって、高性能な電池１を提供できる。   In addition, since a plurality of positive electrode tabs 22 are provided, the electrical resistance value between the positive electrode coating portion 21 and the positive electrode tab 22 can be reduced as compared with a configuration in which one positive electrode tab is provided. The same applies to the negative electrode tab 24. Therefore, a high performance battery 1 can be provided.

ところで、各タブ２２，２４を外装容器２の集電パッド６に接続する作業時には、各タブ２２，２４に力がかかる。ここで、従来技術のように、各タブが電極体の端面から１個ずつ延出する構成の場合、各タブに力がかかると、捲回された正極体および負極体が各タブを介して軸方向に沿って引っ張られて電極体の端面における１箇所から引き出され、電極体が捲回状態から崩壊するおそれがある。
本実施形態では、各タブ２２，２４が複数設けられているので、各タブ２２，２４に力がかかっても、その力を電極体１０の端面における広い領域に分散させることができる。このため、正極体１２および負極体１３が各タブ２２，２４を介して電極体１０の端面から引き出されることを抑制できる。したがって、製造時における電極体１０の崩壊を防止でき、高品質な電池１を提供できる。 By the way, at the time of the operation | work which connects each tab 22 and 24 to the current collection pad 6 of the exterior container 2, force is applied to each tab 22 and 24. FIG. Here, as in the prior art, when each tab extends one by one from the end face of the electrode body, when a force is applied to each tab, the wound positive electrode body and negative electrode body pass through each tab. There is a possibility that the electrode body is pulled out from one place on the end face of the electrode body along the axial direction and collapses from the wound state.
In the present embodiment, since a plurality of tabs 22 and 24 are provided, even if a force is applied to the tabs 22 and 24, the force can be distributed over a wide area on the end face of the electrode body 10. For this reason, it can suppress that the positive electrode body 12 and the negative electrode body 13 are pulled out from the end surface of the electrode body 10 via each tab 22 and 24. FIG. Therefore, the electrode body 10 can be prevented from collapsing during production, and the high-quality battery 1 can be provided.

また、複数の正極タブ２２を重ね合わせて超音波溶着等で束ねる構成とする場合、本実施形態のように、各正極タブ２２は、内周側に寄せられた状態で束ねられることがある。この場合には、各正極タブ２２の軸方向における長さは、内周側に向かって寄せた距離に応じて束ねる前の状態よりも短くなる。負極タブ２４についても同様である。
本実施形態によれば、最も外周側に位置する正極タブ２２は、他の正極タブ２２よりも軸方向に長く形成されているので、各正極タブ２２を内周側に寄せる場合に、最も外周側に位置する正極タブ２２と最も内周側に位置する正極タブ２２との間に他の正極タブ２２を挟み込ませることができる。よって、各正極タブ２２を確実に重ね合わせることができる。負極タブ２４についても同様である。
したがって、複数の正極タブ２２、および複数の負極タブ２４を、それぞれ確実に重ね合わせて束ねることができ、高品質な電池１とすることができる。 Further, when the plurality of positive electrode tabs 22 are overlapped and bundled by ultrasonic welding or the like, the positive electrode tabs 22 may be bundled in a state of being brought closer to the inner peripheral side as in the present embodiment. In this case, the length in the axial direction of each positive electrode tab 22 is shorter than the state before being bundled according to the distance approached toward the inner peripheral side. The same applies to the negative electrode tab 24.
According to the present embodiment, since the positive electrode tab 22 positioned on the outermost peripheral side is formed longer in the axial direction than the other positive electrode tabs 22, when the positive electrode tabs 22 are brought closer to the inner peripheral side, Another positive electrode tab 22 can be sandwiched between the positive electrode tab 22 positioned on the side and the positive electrode tab 22 positioned on the innermost peripheral side. Therefore, the positive electrode tabs 22 can be reliably overlapped. The same applies to the negative electrode tab 24.
Therefore, the plurality of positive electrode tabs 22 and the plurality of negative electrode tabs 24 can be reliably overlapped and bundled, and the high-quality battery 1 can be obtained.

また、電極体１０は、正極体１２と負極体１３とを捲回軸Ｐ回りに捲回してなるので、本実施形態のように複数の正極タブ２２を重ね合わせる場合には、正極体１２が展開された状態において、複数の正極タブ２２の配列間隔を内周側から外周側に向かうに従い順次広くする必要がある。負極タブ２４についても同様である。
本実施形態によれば、正極タブ２２の配列間隔は、電極体１０の内周側から外周側に向かうに従い広く設けられているので、複数の正極タブ２２を重ね合わせることができる。負極タブ２４についても同様である。
したがって、複数の正極タブ２２、および複数の負極タブ２４を、それぞれ確実に重ね合わせることができ、高品質な電池１とすることができる。 Further, since the electrode body 10 is formed by winding the positive electrode body 12 and the negative electrode body 13 around the winding axis P, when the plurality of positive electrode tabs 22 are overlapped as in the present embodiment, the positive electrode body 12 is In the developed state, it is necessary to gradually increase the arrangement interval of the plurality of positive electrode tabs 22 from the inner peripheral side toward the outer peripheral side. The same applies to the negative electrode tab 24.
According to the present embodiment, since the arrangement interval of the positive electrode tabs 22 is widened from the inner peripheral side of the electrode body 10 toward the outer peripheral side, a plurality of positive electrode tabs 22 can be overlapped. The same applies to the negative electrode tab 24.
Therefore, the plurality of positive electrode tabs 22 and the plurality of negative electrode tabs 24 can be reliably overlapped with each other, and the high-quality battery 1 can be obtained.

また、電極体１０は、正極体１２と負極体１３とを捲回軸Ｐ回りに捲回してなるので、捲回時のテンションの変化等により、正極タブ２２および負極タブ２４の捲回軸Ｐ回りの周方向における位置が内周側から外周側に向かうに従い所望の位置からずれやすくなる。
本実施形態によれば、最も外周側に位置する正極タブ２２は、他の正極タブ２２よりも幅広に形成されているので、捲回後に所望の位置からずれた場合であっても、他の正極タブ２２と重なる部分を設けやすくすることができる。負極タブ２４についても同様である。
したがって、複数の正極タブ２２、および複数の負極タブ２４を、それぞれ確実に重ね合わせることができ、高品質な電池１とすることができる。 Further, since the electrode body 10 is formed by winding the positive electrode body 12 and the negative electrode body 13 around the winding axis P, the winding axis P of the positive electrode tab 22 and the negative electrode tab 24 is changed due to a change in tension during winding. As the position in the surrounding circumferential direction goes from the inner circumference side to the outer circumference side, it tends to shift from the desired position.
According to the present embodiment, the positive electrode tab 22 positioned on the outermost peripheral side is formed wider than the other positive electrode tabs 22, so that even if the positive electrode tab 22 is shifted from a desired position after winding, A portion overlapping with the positive electrode tab 22 can be easily provided. The same applies to the negative electrode tab 24.
Therefore, the plurality of positive electrode tabs 22 and the plurality of negative electrode tabs 24 can be reliably overlapped with each other, and the high-quality battery 1 can be obtained.

また、本実施形態の電池１の製造方法は、正極用シート部材３０を切断し、正極活物質塗工領域Ｒ１および正極活物質未塗工領域Ｒ２を切り出すことで、正極体１２を形成する正極体形成工程と、図示しない負極用シート部材を切断し、負極活物質塗工領域および負極活物質未塗工領域を切り出すことで、負極体１３を形成する負極体形成工程と、を備える。
この方法によれば、正極活物質未塗工領域Ｒ２を正極体１２の正極タブ２２とし、負極活物質未塗工領域を負極体１３の負極タブ２４とすることができる。このため、金属箔上の活物質を除去する工程を行うことなく、正極体１２および負極体１３を形成することができる。したがって、電極体１０を容易に製造できる。 Moreover, the manufacturing method of the battery 1 of the present embodiment cuts the positive electrode sheet member 30 and cuts out the positive electrode active material coating region R1 and the positive electrode active material uncoated region R2, thereby forming the positive electrode body 12. A negative electrode body forming step of forming the negative electrode body 13 by cutting a negative electrode sheet member (not shown) and cutting a negative electrode active material coated region and a negative electrode active material uncoated region.
According to this method, the positive electrode active material uncoated region R <b> 2 can be the positive electrode tab 22 of the positive electrode body 12, and the negative electrode active material uncoated region can be the negative electrode tab 24 of the negative electrode body 13. For this reason, the positive electrode body 12 and the negative electrode body 13 can be formed, without performing the process of removing the active material on metal foil. Therefore, the electrode body 10 can be easily manufactured.

また、正極体形成工程では、ロール状に巻かれた正極用シート部材３０を引き出しつつ切断するので、正極用シート部材３０は、ロール状に巻かれた部分から第１方向に沿って引き出され、その引き出された部分には、正極活物質塗工領域Ｒ１および正極活物質未塗工領域Ｒ２が第１方向に沿って一様に延びた状態となる。これにより、正極体形成工程では、複数の正極体１２を連続的に形成することができる。負極体形成工程についても同様である。したがって、製造効率の高い電池１の製造方法を提供できる。   Further, in the positive electrode body forming step, since the positive electrode sheet member 30 wound in a roll shape is cut while being pulled out, the positive electrode sheet member 30 is pulled out along the first direction from the portion wound in the roll shape, In the extracted portion, the positive electrode active material coating region R1 and the positive electrode active material uncoated region R2 are in a state of extending uniformly along the first direction. Thereby, a some positive electrode body 12 can be formed continuously in a positive electrode body formation process. The same applies to the negative electrode body forming step. Therefore, the manufacturing method of the battery 1 with high manufacturing efficiency can be provided.

なお、本発明は、図面を参照して説明した上述の実施形態に限定されるものではなく、その技術的範囲において様々な変形例が考えられる。
例えば、上記実施形態においては、電気化学セルの一例として、非水電解質二次電池を例に挙げて説明したが、この場合に限定されず、電気二重層キャパシタや一次電池等に上述した構成を適用することができる。 The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above embodiment, a non-aqueous electrolyte secondary battery has been described as an example of an electrochemical cell. However, the present invention is not limited to this case, and the configuration described above is applied to an electric double layer capacitor, a primary battery, and the like. Can be applied.

また、上記実施形態では、各正極タブ２２が、より電極体１０の内周側に位置する正極タブ２２よりも軸方向に長く、かつ幅広に形成されているが、これに限定されず、各正極タブ２２が同形同大に形成されていてもよい。負極タブ２４についても同様である。
また、上記実施形態では、正極体１２が展開された状態における複数の正極タブ２２の配列間隔Ｐ１は、電極体１０の内周側から外周側に向かうに従い広く設けられているが、これに限定されない。複数の正極タブは、それらの少なくとも一部同士が重なればよく、配列間隔は適宜設定可能である。負極タブ２４についても同様である。 Moreover, in the said embodiment, although each positive electrode tab 22 is longer in the axial direction and wider than the positive electrode tab 22 located in the inner peripheral side of the electrode body 10, it is not limited to this, The positive electrode tab 22 may be formed in the same shape and size. The same applies to the negative electrode tab 24.
Moreover, in the said embodiment, although the arrangement space | interval P1 of the some positive electrode tab 22 in the state by which the positive electrode body 12 was expand | deployed is widely provided as it goes to the outer peripheral side from the inner peripheral side of the electrode body 10, it is limited to this. Not. The plurality of positive electrode tabs only need to overlap at least part of them, and the arrangement interval can be set as appropriate. The same applies to the negative electrode tab 24.

また、上記実施形態では、セパレータ１４が負極体１３のうち負極１９が塗工された領域の全体と重なるように配置されているが、これに限定されず、セパレータは正極体１２と負極体１３との接触を防止するように配置されていればよい。   Moreover, in the said embodiment, although the separator 14 is arrange | positioned so that it may overlap with the whole area | region where the negative electrode 19 was coated among the negative electrode bodies 13, it is not limited to this, A separator is the positive electrode body 12 and the negative electrode body 13 What is necessary is just to arrange | position so that a contact may be prevented.

また、上記実施形態では、電極体１０を収容する外装容器として、集電パッド６を備えたチップ型の外装容器２を用いているが、これに限定されない。例えば外装容器として、樹脂フィルムが金属箔等に重ねて貼り合された、いわゆるラミネートフィルムにより形成された外装容器を用いてもよい。   Moreover, in the said embodiment, although the chip-type exterior container 2 provided with the current collection pad 6 is used as an exterior container which accommodates the electrode body 10, it is not limited to this. For example, as an exterior container, an exterior container formed of a so-called laminate film in which a resin film is laminated and bonded to a metal foil or the like may be used.

その他、本発明の趣旨を逸脱しない範囲で、上記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能である。   In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

１…電池（電気化学セル） １０…電極体 １２…正極体 １３…負極体 １４…セパレータ １５…正極集電体 １８…負極集電体 ２１…正極塗工部 ２２…正極タブ ２３…負極塗工部 ２４…負極タブ ３０…正極用シート部材 Ｐ…捲回軸 Ｒ１…正極活物質塗工領域 Ｒ２…正極活物質未塗工領域   DESCRIPTION OF SYMBOLS 1 ... Battery (electrochemical cell) 10 ... Electrode body 12 ... Positive electrode body 13 ... Negative electrode body 14 ... Separator 15 ... Positive electrode collector 18 ... Negative electrode collector 21 ... Positive electrode coating part 22 ... Positive electrode tab 23 ... Negative electrode coating Part 24 ... Negative electrode tab 30 ... Positive electrode sheet member P ... Winding shaft R1 ... Positive electrode active material coating region R2 ... Positive electrode active material uncoated region

Claims (6)

正極集電体を有する正極体と、負極集電体を有する負極体と、がセパレータを介して積層された状態で、捲回軸回りに捲回された電極体を備え、
前記正極集電体は、
表面に正極活物質を保持する正極塗工部と、
前記正極塗工部と一体形成され、前記電極体の前記捲回軸の軸方向における一方側の端面から突出する複数の正極タブと、
を有し、
前記負極集電体は、
表面に負極活物質を保持する負極塗工部と、
前記負極塗工部と一体形成され、前記電極体の前記軸方向における前記一方側の端面から突出する複数の負極タブと、
を有する、
ことを特徴とする電気化学セル。 A positive electrode body having a positive electrode current collector and a negative electrode body having a negative electrode current collector are stacked with a separator interposed therebetween, and an electrode body wound around a winding axis is provided,
The positive electrode current collector is
A positive electrode coating portion holding a positive electrode active material on the surface;
A plurality of positive electrode tabs integrally formed with the positive electrode coating portion and projecting from one end face in the axial direction of the winding shaft of the electrode body;
Have
The negative electrode current collector is
A negative electrode coating part holding a negative electrode active material on the surface;
A plurality of negative electrode tabs integrally formed with the negative electrode coating portion and projecting from the one end face in the axial direction of the electrode body;
Having
An electrochemical cell characterized by that. 前記複数の正極タブのうち前記電極体の最も外周側に位置する前記正極タブは、他の前記正極タブよりも前記軸方向に長く形成され、
前記複数の負極タブのうち前記電極体の最も外周側に位置する前記負極タブは、他の前記負極タブよりも前記軸方向に長く形成されている、
ことを特徴とする請求項１に記載の電気化学セル。 Of the plurality of positive electrode tabs, the positive electrode tab located on the outermost peripheral side of the electrode body is formed longer in the axial direction than the other positive electrode tabs,
The negative electrode tab located on the outermost peripheral side of the electrode body among the plurality of negative electrode tabs is formed longer in the axial direction than the other negative electrode tabs,
The electrochemical cell according to claim 1. 前記正極体が展開された状態における前記複数の正極タブの配列間隔は、前記電極体の内周側から外周側に向かうに従い広く設けられ、
前記負極体が展開された状態における前記複数の負極タブの配列間隔は、前記電極体の内周側から外周側に向かうに従い広く設けられている、
ことを特徴とする請求項１または２に記載の電気化学セル。 The arrangement interval of the plurality of positive electrode tabs in a state in which the positive electrode body is expanded is widely provided from the inner peripheral side to the outer peripheral side of the electrode body,
The arrangement interval of the plurality of negative electrode tabs in a state where the negative electrode body is expanded is provided wider from the inner peripheral side toward the outer peripheral side of the electrode body.
The electrochemical cell according to claim 1 or 2, wherein 前記複数の正極タブのうち前記電極体の最も外周側に位置する前記正極タブは、他の前記正極タブよりも幅広に形成され、
前記複数の負極タブのうち前記電極体の最も外周側に位置する前記負極タブは、他の前記負極タブよりも幅広に形成されている、
ことを特徴とする請求項１から３のいずれか１項に記載の電気化学セル。 The positive electrode tab located on the outermost peripheral side of the electrode body among the plurality of positive electrode tabs is formed wider than the other positive electrode tabs,
Of the plurality of negative electrode tabs, the negative electrode tab located on the outermost peripheral side of the electrode body is formed wider than the other negative electrode tabs,
The electrochemical cell according to any one of claims 1 to 3, wherein: 請求項１から４のいずれか１項に記載の電気化学セルの製造方法であって、
正極活物質塗工領域および正極活物質未塗工領域を有する金属箔により形成された正極用シート部材を切断し、前記正極活物質塗工領域および前記正極活物質未塗工領域を切り出すことで、前記正極体を形成する正極体形成工程と、
負極活物質塗工領域および負極活物質未塗工領域を有する金属箔により形成された負極用シート部材を切断し、前記負極活物質塗工領域および前記負極活物質未塗工領域を切り出すことで、前記負極体を形成する負極体形成工程と、
を備えることを特徴とする電気化学セルの製造方法。 A method for producing an electrochemical cell according to any one of claims 1 to 4,
By cutting a positive electrode sheet member formed of a metal foil having a positive electrode active material coated region and a positive electrode active material uncoated region, and cutting out the positive electrode active material coated region and the positive electrode active material uncoated region. A positive electrode body forming step for forming the positive electrode body;
By cutting a negative electrode sheet member formed of a metal foil having a negative electrode active material coated region and a negative electrode active material uncoated region, and cutting out the negative electrode active material coated region and the negative electrode active material uncoated region. A negative electrode body forming step for forming the negative electrode body;
A method for producing an electrochemical cell, comprising: 前記正極用シート部材は、第１方向に沿って一様に延びる前記正極活物質塗工領域および前記正極活物質未塗工領域を備えるとともに、前記第１方向に直交する第２方向に沿う軸回りにロール状に巻かれ、
前記負極用シート部材は、第３方向に沿って一様に延びる前記負極活物質塗工領域および前記負極活物質未塗工領域を備えるとともに、前記第３方向に直交する第４方向に沿う軸回りにロール状に巻かれ、
前記正極体形成工程では、ロール状に巻かれた前記正極用シート部材を引き出しつつ切断し、
前記負極体形成工程では、ロール状に巻かれた前記負極用シート部材を引き出しつつ切断する、
ことを特徴とする請求項５に記載の電気化学セルの製造方法。 The positive electrode sheet member includes the positive electrode active material coating region and the positive electrode active material uncoated region that extend uniformly along a first direction, and an axis along a second direction orthogonal to the first direction. Rolled around a roll,
The negative electrode sheet member includes the negative electrode active material coating region and the negative electrode active material uncoated region that extend uniformly along a third direction, and an axis along a fourth direction orthogonal to the third direction. Rolled around a roll,
In the positive electrode body forming step, the positive electrode sheet member wound in a roll shape is cut while being drawn,
In the negative electrode body forming step, cutting while pulling out the negative electrode sheet member wound in a roll shape,
The method for producing an electrochemical cell according to claim 5.
JP2016189183A 2016-09-28 2016-09-28 Electrochemical cell and manufacturing method of the electrochemical cell Pending JP2018055904A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110828775A (en) * 2019-10-15 2020-02-21 江苏卓高新材料科技有限公司 Current collector electrode structure, secondary battery and preparation method of secondary battery
CN112864448A (en) * 2021-03-12 2021-05-28 湖北亿纬动力有限公司 Battery monomer, battery cooling system and electric automobile
WO2023116077A1 (en) * 2021-12-21 2023-06-29 比亚迪股份有限公司 Battery unit, battery module, and vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110828775A (en) * 2019-10-15 2020-02-21 江苏卓高新材料科技有限公司 Current collector electrode structure, secondary battery and preparation method of secondary battery
CN112864448A (en) * 2021-03-12 2021-05-28 湖北亿纬动力有限公司 Battery monomer, battery cooling system and electric automobile
WO2023116077A1 (en) * 2021-12-21 2023-06-29 比亚迪股份有限公司 Battery unit, battery module, and vehicle

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