JP7269212B2 - BATTERY AND MANUFACTURING METHOD THEREOF - Google Patents

BATTERY AND MANUFACTURING METHOD THEREOF Download PDF

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JP7269212B2
JP7269212B2 JP2020198301A JP2020198301A JP7269212B2 JP 7269212 B2 JP7269212 B2 JP 7269212B2 JP 2020198301 A JP2020198301 A JP 2020198301A JP 2020198301 A JP2020198301 A JP 2020198301A JP 7269212 B2 JP7269212 B2 JP 7269212B2
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plate
deformation plate
current collector
deformation
groove
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伸佳 橘
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Prime Planet Energy and Solutions 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
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    • Y02E60/10—Energy storage using batteries

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Description

本技術は、電池およびその製造方法に関する。 The present technology relates to a battery and a manufacturing method thereof.

電池ケース内の圧力が過度に上昇したときに作動して導電経路を遮断することが可能な電流遮断機構を備えた電池が従来から知られている。このような構造は、たとえば特開２０１０－２１２０３４号公報（特許文献１）および特開２０１９－８７４７８号公報（特許文献２）に示されている。 2. Description of the Related Art Conventionally, a battery is known that has a current interrupting mechanism that can be activated to interrupt a conductive path when the pressure inside the battery case rises excessively. Such a structure is disclosed, for example, in Japanese Unexamined Patent Application Publication No. 2010-212034 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2019-87478 (Patent Document 2).

特開２０１０－２１２０３４号公報JP 2010-212034 A 特開２０１９－８７４７８号公報JP 2019-87478 A

電流遮断機構においては、電池ケース内の圧力が上昇したときに、変形板の中央部が封口板側に移動するように変形することにより、集電体と変形板との溶接接合部が破断する。これにより、電極端子と電極体との間の導電経路が切断される。 In the current interrupting mechanism, when the pressure inside the battery case rises, the central portion of the deformation plate deforms to move toward the sealing plate, breaking the weld joint between the current collector and the deformation plate. . This cuts off the conductive path between the electrode terminal and the electrode body.

変形板の中央部が封口板から離れる方向に変形板を撓ませた状態で変形板と集電体とが溶接接合される。このとき、変形板の撓み変形量が安定しないと、集電体と変形板との溶接接合部の破断荷重が安定せず、結果として、電流遮断機構の作動が安定しない。従来の電流遮断機構は、この観点から必ずしも十分なものとはいえない。 The deformable plate and the current collector are welded together while the deformable plate is bent in a direction in which the central portion of the deformable plate separates from the sealing plate. At this time, if the bending deformation amount of the deformable plate is not stabilized, the breaking load of the weld joint between the current collector and the deformable plate is not stabilized, resulting in unstable operation of the current interrupting mechanism. Conventional current interrupting mechanisms are not necessarily satisfactory from this point of view.

本技術の目的は、電流遮断機構の作動が安定した電池およびその製造方法を提供することにある。 An object of the present technology is to provide a battery in which the operation of a current interrupting mechanism is stable, and a manufacturing method thereof.

本技術に係る電池は、電極体と、電極体を収容する外装体および外装体を封口する封口板を含む電池ケースと、封口板に取付けられた端子部と、端子部に接続され、電極体側に開口部を有する導電部材と、導電部材の開口部を封止する変形板と、変形板と接合される集電体とを備える。電極体は、集電体、変形板、および導電部材を介して端子部と電気的に接続される。電池ケース内の圧力が所定値以上となったときに、変形板が変形することに伴い、電極体と端子部との間の電気的な接続が切断される。変形板は、封口板側の第１表面と、電極体側の第２表面とを有する。変形板はさらに、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部を有し得る。 A battery according to the present technology includes an electrode body, a battery case including an exterior body that houses the electrode body, and a sealing plate that seals the exterior body, a terminal portion attached to the sealing plate, and a terminal portion connected to the electrode body side. a conductive member having an opening in the conductive member; a deformation plate that seals the opening of the conductive member; and a current collector that is joined to the deformation plate. The electrode body is electrically connected to the terminal portion via the current collector, the deformation plate, and the conductive member. When the pressure inside the battery case reaches or exceeds a predetermined value, the deformation plate deforms, thereby disconnecting the electrical connection between the electrode body and the terminal portion. The deformation plate has a first surface on the side of the sealing plate and a second surface on the side of the electrode body. The deformable plate may further have a thickened portion in a region including its center, which is relatively thicker than its surroundings.

１つの局面では、変形板の第１表面上において、厚肉部よりも外周側であり、かつ、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも小さい領域に略環状の溝が形成される。ここで、溝の開口を閉じる方向の応力が変形板に生じた状態で変形板が集電体に接合される。 In one aspect, on the first surface of the deformation plate, a region that is closer to the outer periphery than the thick portion and that is less than half the distance from the center to the outer periphery of the deformation plate. A substantially annular groove is formed in the . Here, the deformable plate is joined to the current collector in a state in which stress is applied to the deformable plate in a direction to close the opening of the groove.

他の局面では、変形板の第２表面上において、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも大きい領域に略環状の溝が形成される。ここで、溝の開口を閉じる方向の応力が変形板に生じた状態で変形板が集電体に接合される。 In another aspect, a substantially annular groove is formed on the second surface of the deformation plate in an area whose distance from the center of the deformation plate is greater than half the distance from the center to the outer peripheral edge of the deformation plate. Here, the deformable plate is joined to the current collector in a state in which stress is applied to the deformable plate in a direction to close the opening of the groove.

さらに他の局面では、変形板の第１表面上において、厚肉部よりも外周側であり、かつ、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも小さい第１領域に略環状の第１溝が形成され、変形板の第２表面上において、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも大きい第２領域に略環状の第２溝が形成される。 In yet another aspect, on the first surface of the deformable plate, the thick portion is closer to the outer periphery than the thick portion, and the distance from the center of the deformable plate is less than half the distance from the center to the outer peripheral edge of the deformable plate. A substantially annular first groove is formed in the first region, and on the second surface of the deformation plate, the second region has a distance from the center of the deformation plate that is greater than half the distance from the center to the outer peripheral edge of the deformation plate. A substantially annular second groove is formed.

ここで、第１溝および第２溝の開口を閉じる方向の応力が変形板に生じた状態で変形板が集電体に接合され得る。また、第１溝および第２溝は、変形板を集電体から切り離した状態で、底部の幅よりも開口の幅が広い断面形状を有し得る。 Here, the deformable plate can be joined to the current collector in a state in which stress is applied to the deformable plate in a direction to close the openings of the first groove and the second groove. Also, the first groove and the second groove may have a cross-sectional shape in which the width of the opening is wider than the width of the bottom when the deformation plate is separated from the current collector.

本技術に係る電池の製造方法は、電極体と集電体とを接続する工程と、端子部および導電部材を電池ケースの封口板に取り付ける工程と、第１表面および第２表面を有し、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部が形成された変形板を準備する工程と、変形板に略環状の溝を形成する工程と、変形板の第１表面を封口板側に向け、変形板の第２表面を電極体側に向けた状態で、封口板に取付けられた導電部材の開口部を変形板により封止する工程と、溝の開口を閉じる方向に変形板を変形させた状態で変形板と集電体とを接合することにより、集電体、変形板、および導電部材を介して電極体と端子部と電気的に接続する工程と、電極体を外装体に収容し、外装体を封口板により封口する工程とを備える。 A method for manufacturing a battery according to the present technology includes a step of connecting an electrode body and a current collector, a step of attaching a terminal portion and a conductive member to a sealing plate of a battery case, a first surface and a second surface, a step of preparing a deformation plate in which a thick portion relatively thicker than the surrounding area is formed in a region including the center; a step of forming a substantially annular groove in the deformation plate; sealing the opening of the conductive member attached to the sealing plate with the deformation plate in a state in which the first surface faces the sealing plate and the second surface of the deformation plate faces the electrode body; and the opening of the groove is closed. A step of electrically connecting the electrode body and the terminal portion via the current collector, the deformation plate, and the conductive member by joining the deformation plate and the current collector in a state where the deformation plate is deformed in the direction; and a step of housing the electrode assembly in an exterior body and sealing the exterior body with a sealing plate.

１つの局面では、変形板に略環状の溝を形成する工程は、変形板の第１表面上において、厚肉部よりも外周側であり、かつ、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも小さい領域に略環状の溝を形成することを含む。 In one aspect, the step of forming the substantially annular groove in the deformation plate is on the outer peripheral side of the thick portion on the first surface of the deformation plate, and the distance from the center of the deformation plate is the deformation from the center. Forming a generally annular groove in an area less than half the distance to the outer perimeter of the plate.

他の局面では、変形板に略環状の溝を形成する工程は、変形板の第２表面上において、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも大きい領域に略環状の溝を形成することを含む。 In another aspect, the step of forming a substantially annular groove in the deformation plate is such that the distance from the center of the deformation plate on the second surface of the deformation plate is greater than half the distance from the center to the outer peripheral edge of the deformation plate. Forming a substantially annular groove in the region.

さらに他の局面では、変形板に略環状の溝を形成する工程は、変形板の第１表面上において、厚肉部よりも外周側であり、かつ、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも小さい第１領域に略環状の第１溝を形成することと、変形板の第２表面上において、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも大きい第２領域に略環状の第２溝を形成することとを含む。 In still another aspect, the step of forming the substantially annular groove in the deformation plate is located on the outer peripheral side of the thick portion on the first surface of the deformation plate, and the distance from the center of the deformation plate is Forming a substantially annular first groove in a first region that is less than half the distance to the outer peripheral edge of the deformation plate; forming a generally annular second groove in a second region greater than half the distance to the outer periphery of the .

さらに他の局面では、変形板に略環状の溝を形成する工程は、変形板の第１表面上において、厚肉部よりも外周側であり、かつ、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも小さい第１領域に、底部の幅よりも開口の幅が広い断面形状を有する略環状の第１溝を形成することと、変形板の第２表面上において、変形板の中心からの距離が中心から変形板の外周縁までの距離の半分よりも大きい第２領域に、底部の幅よりも開口の幅が広い断面形状を有する略環状の第２溝を形成することとを含む。 In still another aspect, the step of forming the substantially annular groove in the deformation plate is located on the outer peripheral side of the thick portion on the first surface of the deformation plate, and the distance from the center of the deformation plate is forming a substantially annular first groove having a cross-sectional shape with an opening wider than the bottom width in a first region smaller than half the distance to the outer peripheral edge of the deformation plate; and a second surface of the deformation plate. In the above, a substantially annular second region having a cross-sectional shape in which the width of the opening is wider than the width of the bottom in the second region where the distance from the center of the deformation plate is greater than half the distance from the center to the outer peripheral edge of the deformation plate and forming a groove.

本技術によれば、電流遮断機構の作動が安定した電池およびその製造方法を提供することができる。 According to the present technology, it is possible to provide a battery in which the operation of the current interrupting mechanism is stable, and a manufacturing method thereof.

角形二次電池の斜視図である。1 is a perspective view of a prismatic secondary battery; FIG. 図１におけるII－II断面図である。FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1; 電極体を構成する正極板の平面図である。FIG. 3 is a plan view of a positive electrode plate that constitutes the electrode body; 電極体を構成する負極板の平面図である。FIG. 3 is a plan view of a negative electrode plate that constitutes the electrode body; 正極板および負極板からなる電極体を示す平面図である。FIG. 2 is a plan view showing an electrode body consisting of a positive electrode plate and a negative electrode plate; 電極体と正極集電部材および負極集電部材との接続構造を示す図である。FIG. 3 is a diagram showing a connection structure between an electrode body, a positive collector member, and a negative collector member. 封口板への正極集電部材および負極集電部材の取付構造を示す図である。FIG. 4 is a diagram showing a mounting structure of a positive current collecting member and a negative current collecting member to a sealing plate; 図７におけるＶIII-ＶIII断面図である。FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7; 図７におけるIＸ－IＸ断面図である。FIG. 8 is a cross-sectional view taken along line IX-IX in FIG. 7; 封口板と電極体とが接続された状態を示す図である。It is a figure which shows the state where the sealing board and the electrode body were connected. 封口板と電極体とが接続された状態における正極集電部材周辺の拡大図である。FIG. 4 is an enlarged view of the vicinity of the positive collector member in a state where the sealing plate and the electrode body are connected; 変形板の断面図である。It is a cross-sectional view of a deformation plate. 変形板の上面図である。It is a top view of a deformation plate. 変形板の下面図である。It is a bottom view of a deformation|transformation board. 図１２中のα部の周辺を示す拡大図である。FIG. 13 is an enlarged view showing the periphery of the α portion in FIG. 12; 図１２中のβ部の周辺を示す拡大図である。13 is an enlarged view showing the periphery of the β portion in FIG. 12; FIG. 図１２～図１６に示す変形板を変形させて集電体に接合した状態を示す断面図である。FIG. 17 is a cross-sectional view showing a state in which the deformation plate shown in FIGS. 12 to 16 is deformed and joined to a current collector; 変形板に形成される溝の形状の変形例を示す図である。It is a figure which shows the modification of the shape of the groove|channel formed in a deformation|transformation board.

以下に、本技術の実施の形態について説明する。なお、同一または相当する部分に同一の参照符号を付し、その説明を繰返さない場合がある。 Embodiments of the present technology will be described below. In some cases, the same reference numerals are given to the same or corresponding parts, and the description thereof will not be repeated.

なお、以下に説明する実施の形態において、個数、量などに言及する場合、特に記載がある場合を除き、本技術の範囲は必ずしもその個数、量などに限定されない。また、以下の実施の形態において、各々の構成要素は、特に記載がある場合を除き、本技術にとって必ずしも必須のものではない。 In the embodiments described below, when referring to the number, amount, etc., the scope of the present technology is not necessarily limited to the number, amount, etc., unless otherwise specified. Also, in the following embodiments, each component is not necessarily essential for the present technology unless otherwise specified.

なお、本明細書において、「備える（ｃｏｍｐｒｉｓｅ）」および「含む（ｉｎｃｌｕｄｅ）」、「有する（ｈａｖｅ）」の記載は、オープンエンド形式である。すなわち、ある構成を含む場合に、当該構成以外の他の構成を含んでもよいし、含まなくてもよい。また、本技術は、本実施の形態において言及する作用効果を必ずしもすべて奏するものに限定されない。 In this specification, the descriptions of "comprise," "include," and "have" are open-ended. That is, when a certain configuration is included, other configurations may or may not be included. In addition, the present technology is not necessarily limited to one that exhibits all of the effects referred to in the present embodiment.

本明細書において、「電池」は、リチウムイオン電池に限定されず、ニッケル水素電池など他の電池を含み得る。本明細書において、「電極」は正極および負極を総称し得る。また、「電極板」は正極板および負極板を総称し得る。 As used herein, "battery" is not limited to lithium-ion batteries, but may include other batteries such as nickel-metal hydride batteries. As used herein, "electrode" may collectively refer to positive and negative electrodes. Also, the term "electrode plate" may collectively refer to a positive electrode plate and a negative electrode plate.

図１は、角形二次電池１の斜視図である。図２は、図１におけるII－II断面図である。 FIG. 1 is a perspective view of a prismatic secondary battery 1. FIG. FIG. 2 is a cross-sectional view taken along line II--II in FIG.

図１，図２に示すように、角形二次電池１は、電池ケース１００と、電極体２００と、絶縁シート３００と、正極端子４００と、負極端子５００と、正極集電部材６００と、負極集電部材７００と、電流遮断機構８００と、カバー部材９００とを含む。 As shown in FIGS. 1 and 2, the prismatic secondary battery 1 includes a battery case 100, an electrode body 200, an insulating sheet 300, a positive electrode terminal 400, a negative electrode terminal 500, a positive current collecting member 600, and a negative electrode. It includes a collector member 700 , a current interrupting mechanism 800 and a cover member 900 .

電池ケース１００は、開口を有する有底角筒状の角形外装体１１０と、角形外装体１１０の開口を封口する封口板１２０とからなる。角形外装体１１０および封口板１２０は、それぞれ金属製であることが好ましく、アルミニウムまたはアルミニウム合金製とすることが好ましい。 The battery case 100 is composed of a bottomed prismatic rectangular outer body 110 having an opening and a sealing plate 120 that seals the opening of the rectangular outer body 110 . Rectangular exterior body 110 and sealing plate 120 are preferably made of metal, preferably aluminum or an aluminum alloy.

封口板１２０には、電解液注液孔１２１が設けられる。電解液注液孔１２１から電池ケース１００内に電解液が注液された後、電解液注液孔１２１は、封止部材１２２により封止される。封止部材１２２としては、たとえばブラインドリベットおよびその他の金属部材を用いることができる。 The sealing plate 120 is provided with an electrolyte injection hole 121 . After the electrolyte is injected into the battery case 100 through the electrolyte injection hole 121 , the electrolyte injection hole 121 is sealed by the sealing member 122 . For example, blind rivets and other metal members can be used as the sealing member 122 .

封口板１２０には、ガス排出弁１２３が設けられる。ガス排出弁１２３は、電池ケース１００内の圧力が所定値以上となった際に破断する。これにより、電池ケース１００内のガスが電池ケース１００外に排出される。 A gas exhaust valve 123 is provided on the sealing plate 120 . The gas exhaust valve 123 breaks when the pressure inside the battery case 100 exceeds a predetermined value. As a result, the gas inside the battery case 100 is discharged to the outside of the battery case 100 .

電極体２００は、電解液とともに電池ケース１００内に収容されている。電極体２００は、正極板と負極板がセパレータを介して積層されたものである。電極体２００と角形外装体１１０の間には樹脂製の絶縁シート３００が配置されている。 The electrode body 200 is accommodated in the battery case 100 together with the electrolyte. The electrode body 200 is formed by stacking a positive electrode plate and a negative electrode plate with a separator interposed therebetween. An insulating sheet 300 made of resin is arranged between the electrode body 200 and the rectangular outer body 110 .

電極体２００の封口板１２０側の端部には、正極タブ２１０Ａおよび負極タブ２１０Ｂが設けられている。 A positive electrode tab 210A and a negative electrode tab 210B are provided at the end of the electrode body 200 on the side of the sealing plate 120 .

正極タブ２１０Ａと正極端子４００とは、正極集電部材６００を介して電気的に接続されている。正極集電部材６００は、第１正極集電体６１０および第２正極集電体６２０を含む。なお、正極集電部材６００は、１つの部品から構成されてもよい。正極集電部材６００は、金属製であることが好ましく、アルミニウムまたはアルミニウム合金製とすることがより好ましい。 The positive electrode tab 210</b>A and the positive electrode terminal 400 are electrically connected via the positive current collecting member 600 . The positive current collector 600 includes a first positive current collector 610 and a second positive current collector 620 . In addition, the positive electrode current collecting member 600 may be composed of one component. The positive electrode current collecting member 600 is preferably made of metal, and more preferably made of aluminum or an aluminum alloy.

負極タブ２１０Ｂと負極端子５００とは、負極集電部材７００を介して電気的に接続されている。負極集電部材７００は、第１負極集電体７１０および第２負極集電体７２０を含む。なお、負極集電部材７００は、１つの部品から構成されてもよい。負極集電部材７００は、金属製であることが好ましく、銅または銅合金製であることがより好ましい。 The negative electrode tab 210B and the negative electrode terminal 500 are electrically connected via the negative current collecting member 700 . The negative electrode current collector 700 includes a first negative electrode current collector 710 and a second negative electrode current collector 720 . Note that the negative electrode current collecting member 700 may be composed of one component. The negative electrode current collecting member 700 is preferably made of metal, and more preferably made of copper or a copper alloy.

正極端子４００は、樹脂製の外部側絶縁部材４１０を介して封口板１２０に固定されている。負極端子５００は、樹脂製の外部側絶縁部材５１０を介して封口板１２０に固定されている。 The positive electrode terminal 400 is fixed to the sealing plate 120 via an external insulating member 410 made of resin. The negative electrode terminal 500 is fixed to the sealing plate 120 via an external insulating member 510 made of resin.

正極端子４００は金属製であることが好ましく、アルミニウムまたはアルミニウム合金製であることがより好ましい。負極端子５００は金属製であることが好ましく、銅または銅合金製であることがより好ましい。負極端子５００が、電池ケース１００の内部側に配置される銅または銅合金からなる領域と、電池ケース１００の外部側に配置されるアルミニウムまたはアルミニウム合金からなる領域を有するようにしてもよい。 The positive electrode terminal 400 is preferably made of metal, and more preferably made of aluminum or an aluminum alloy. The negative electrode terminal 500 is preferably made of metal, and more preferably made of copper or a copper alloy. Negative electrode terminal 500 may have a region made of copper or a copper alloy located inside battery case 100 and a region made of aluminum or an aluminum alloy located outside battery case 100 .

電流遮断機構８００は、正極タブ２１０Ａ（正極板）と正極端子４００の間の導電経路に設けられる。電流遮断機構８００は、電池ケース１００内の圧力が所定値以上となった際に作動し、導電経路を遮断することができる。ガス排出弁１２３の作動圧は、電流遮断機構８００の作動圧よりも大きい値に設定される。電流遮断機構８００は、負極タブ２１０Ｂと負極端子５００の間の導電経路に設けることもできる。 The current interrupting mechanism 800 is provided in the conductive path between the positive electrode tab 210A (positive electrode plate) and the positive electrode terminal 400 . The current interrupting mechanism 800 operates when the pressure inside the battery case 100 reaches or exceeds a predetermined value, and can interrupt the conductive path. The operating pressure of gas exhaust valve 123 is set to a value higher than the operating pressure of current interrupting mechanism 800 . The current interrupting mechanism 800 can also be provided in the conductive path between the negative electrode tab 210B and the negative electrode terminal 500. FIG.

図３は、電極体２００を構成する正極板２００Ａの平面図である。正極板２００Ａは、矩形状のアルミニウム箔からなる正極芯体の両面に正極活物質（たとえばリチウムニッケルコバルトマンガン複合酸化物等）、結着材（ポリフッ化ビニリデン（ＰＶｄＦ）等）、および導電材（たとえば炭素材料等）を含む正極活物質合剤層が形成された本体部２２０Ａを有する。本体部の端辺から正極芯体が突出しており、この突出した正極芯体が正極タブ２１０Ａを構成する。正極タブ２１０Ａにおける本体部の２２０Ａと隣接する部分には、アルミナ粒子、結着材、および導電材を含む正極保護層２３０Ａが設けられている。正極保護層２３０Ａは、正極活物質合剤層の電気抵抗よりも大きな電気抵抗を有する。正極活物質合剤層は導電材を含まなくてもとい。正極保護層２３０Ａは必ずしも設けられなくてもよい。 FIG. 3 is a plan view of a positive electrode plate 200A that constitutes the electrode assembly 200. FIG. The positive electrode plate 200A includes a positive electrode active material (for example, lithium-nickel-cobalt-manganese composite oxide, etc.), a binder (polyvinylidene fluoride (PVdF), etc.), and a conductive material ( For example, it has a main body portion 220A on which a positive electrode active material mixture layer containing a carbon material or the like is formed. A positive electrode core protrudes from the edge of the main body, and the protruding positive electrode core constitutes the positive electrode tab 210A. A positive electrode protective layer 230A containing alumina particles, a binder, and a conductive material is provided on a portion of the positive electrode tab 210A adjacent to the body portion 220A. The positive electrode protective layer 230A has an electrical resistance greater than that of the positive electrode active material mixture layer. The positive electrode active material mixture layer does not have to contain a conductive material. The positive electrode protective layer 230A does not necessarily have to be provided.

図４は、電極体２００を構成する負極板２００Ｂの平面図である。負極板２００Ｂは、矩形状の銅箔からなる負極芯体の両面に負極活物質層が形成された本体部２２０Ｂを有する。本体部２２０Ｂの端辺から負極芯体が突出しており、この突出した負極芯体が負極タブ２１０Ｂを構成する。 FIG. 4 is a plan view of the negative electrode plate 200B that constitutes the electrode body 200. FIG. The negative electrode plate 200B has a main body portion 220B in which negative electrode active material layers are formed on both sides of a negative electrode core made of rectangular copper foil. A negative electrode core protrudes from an end side of the main body portion 220B, and the protruding negative electrode core constitutes the negative electrode tab 210B.

図５は、正極板２００Ａおよび負極板２００Ｂからなる電極体２００を示す平面図である。図５に示すように、電極体２００は、一方の端部において各々の正極板２００Ａの正極タブ２１０Ａが積層され、各々の負極板２００Ｂの負極タブ２１０Ｂが積層されるように作製される。正極板２００Ａおよび負極板２００Ｂは、たとえば各々５０枚程度ずつ重ねられる。正極板２００Ａと負極板２００Ｂとは、ポリオレフィン製の矩形状のセパレータを介して交互に積層される。なお、長尺のセパレータをつづら折りして用いてもよい。 FIG. 5 is a plan view showing an electrode assembly 200 consisting of a positive electrode plate 200A and a negative electrode plate 200B. As shown in FIG. 5, the electrode body 200 is manufactured so that the positive tabs 210A of each positive plate 200A are laminated at one end, and the negative tabs 210B of each negative plate 200B are laminated. The positive electrode plates 200A and the negative electrode plates 200B are stacked, for example, by about 50 sheets each. The positive electrode plates 200A and the negative electrode plates 200B are alternately laminated with rectangular separators made of polyolefin interposed therebetween. Note that a long separator may be zigzagged and used.

図６は、電極体２００と正極集電部材６００および負極集電部材７００との接続構造を示す図である。図６に示すように、電極体２００は、第１電極体要素２０１（第１積層群）および第２電極体要素２０２（第２積層群）により構成される。第１電極体要素２０１および第２電極体要素２０２の外面にもセパレータが各々配置される。第１電極体要素２０１および第２電極体要素２０２は、たとえばテープ等により積層状態の状態で固定することができる。代替的に、各々の正極板２００Ａ、負極板２００Ｂおよびセパレータに接着層を設け、セパレータと正極板２００Ａとが各々接着され、セパレータと負極板２００Ｂとが各々接着されるようにしてもよい。 FIG. 6 is a diagram showing a connection structure between the electrode body 200 and the positive current collecting member 600 and the negative current collecting member 700. As shown in FIG. As shown in FIG. 6, the electrode body 200 is composed of a first electrode body element 201 (first lamination group) and a second electrode body element 202 (second lamination group). Separators are also disposed on the outer surfaces of the first electrode element 201 and the second electrode element 202, respectively. The first electrode body element 201 and the second electrode body element 202 can be fixed in a layered state by, for example, tape or the like. Alternatively, an adhesive layer may be provided on each of the positive electrode plate 200A, the negative electrode plate 200B, and the separator so that the separator and the positive electrode plate 200A are adhered to each other, and the separator and the negative electrode plate 200B are adhered to each other.

第１電極体要素２０１の複数枚の正極タブ２１０Ａが第１正極タブ群２１１Ａを構成する。第１電極体要素２０１の複数枚の負極タブ２１０Ｂが第１負極タブ群２１１Ｂを構成する。第２電極体要素２０２の複数枚の正極タブ２１０Ａが第２正極タブ群２１２Ａを構成する。第２電極体要素２０２の複数枚の負極タブ２１０Ｂが第２負極タブ群２１２Ｂを構成する。 A plurality of positive electrode tabs 210A of the first electrode body element 201 constitute a first positive electrode tab group 211A. A plurality of negative electrode tabs 210B of the first electrode element 201 constitute a first negative electrode tab group 211B. A plurality of positive electrode tabs 210A of the second electrode body element 202 constitute a second positive electrode tab group 212A. A plurality of negative electrode tabs 210B of the second electrode element 202 constitute a second negative electrode tab group 212B.

第１電極体要素２０１と第２電極体要素２０２の間に、第２正極集電体６２０と第２負極集電体７２０とが配置される。第２正極集電体６２０は、第１開口６２０Ａおよび第２開口６２０Ｂを有する。第１正極タブ群２１１Ａおよび第２正極タブ群２１２Ａが、第２正極集電体６２０上に溶接接続され、溶接接続部２１３が形成される。第１負極タブ群２１１Ｂおよび第２負極タブ群２１２Ｂが、第２負極集電体７２０上に溶接接続され、溶接接続部２１３が形成される。溶接接続部２１３は、たとえば、超音波溶接、抵抗溶接、レーザ溶接等により形成し得る。 A second positive current collector 620 and a second negative current collector 720 are arranged between the first electrode body element 201 and the second electrode body element 202 . The second positive electrode current collector 620 has a first opening 620A and a second opening 620B. The first positive electrode tab group 211A and the second positive electrode tab group 212A are welded onto the second positive electrode current collector 620 to form the weld connection portion 213 . The first negative electrode tab group 211B and the second negative electrode tab group 212B are welded onto the second negative electrode current collector 720 to form the weld connection portion 213 . Weld connection 213 may be formed, for example, by ultrasonic welding, resistance welding, laser welding, or the like.

図７は、封口板１２０への正極集電部材６００および負極集電部材７００の取付構造を示す図である。図８は、図７におけるＶIII-ＶIII断面を示す。図９は、図７におけるIＸ－IＸ断面を示す。 7A and 7B are diagrams showing a mounting structure of the positive collector member 600 and the negative collector member 700 to the sealing plate 120. FIG. FIG. 8 shows the VIII-VIII cross section in FIG. FIG. 9 shows the IX-IX section in FIG.

まず、図７，図８を参照して、封口板１２０への正極集電部材６００の取付について説明する。 First, with reference to FIGS. 7 and 8, the attachment of the positive collector member 600 to the sealing plate 120 will be described.

封口板１２０の外面側に樹脂製の外部側絶縁部材４１０が配置される。封口板１２０の内面側に樹脂製の絶縁部材４２０および導電部材４３０が配置される。その後、正極端子４００が、外部側絶縁部材４１０の貫通穴 、封口板１２０の正極端子取り付け孔、絶縁部材４２０の貫通穴、および導電部材４３０の貫通穴に挿入される。そして、正極端子４００の先端が導電部材４３０上にカシメ接続される。これにより、正極端子４００、外部側絶縁部材４１０、封口板１２０、絶縁部材４２０、および導電部材４３０が固定される。正極端子４００および導電部材４３０のカシメ接続された部分は、レーザ溶接等により溶接されることが好ましい。 An external insulating member 410 made of resin is arranged on the outer surface side of the sealing plate 120 . An insulating member 420 and a conductive member 430 made of resin are arranged on the inner surface side of the sealing plate 120 . After that, the positive electrode terminal 400 is inserted into the through hole of the external insulating member 410 , the positive electrode terminal mounting hole of the sealing plate 120 , the through hole of the insulating member 420 , and the through hole of the conductive member 430 . Then, the tip of the positive electrode terminal 400 is caulked onto the conductive member 430 . Thereby, the positive electrode terminal 400, the external insulating member 410, the sealing plate 120, the insulating member 420, and the conductive member 430 are fixed. The caulking-connected portions of positive electrode terminal 400 and conductive member 430 are preferably welded by laser welding or the like.

導電部材４３０は、導電部材ベース部４３１と、導電部材ベース部４３１の縁部から電極体２００（図中下側）に向かって延びる管状部４３２とを有する。管状部４３２の電極体２００側の端部には、開口部４３３が設けられている。なお、正極端子４００と導電部材４３０とは一体の部材として設けられてもよい。 The conductive member 430 has a conductive member base portion 431 and a tubular portion 432 extending from the edge portion of the conductive member base portion 431 toward the electrode body 200 (lower side in the figure). An opening 433 is provided at the end of the tubular portion 432 on the electrode body 200 side. Note that the positive electrode terminal 400 and the conductive member 430 may be provided as an integral member.

変形板４４０は、導電部材４３０の開口部４３３を塞ぐように配置される。変形板４４０の周縁は、レーザ溶接等により導電部材４３０に溶接される。これにより、導電部材４３０の開口部４３３が変形板４４０により密閉される。なお、導電部材４３０および変形板４４０はそれぞれ金属製であることが好ましく、アルミニウムまたはアルミニウム合金であることがより好ましい。 The deformation plate 440 is arranged so as to close the opening 433 of the conductive member 430 . A peripheral edge of the deformation plate 440 is welded to the conductive member 430 by laser welding or the like. Thereby, the opening 433 of the conductive member 430 is sealed by the deformation plate 440 . The conductive member 430 and the deformation plate 440 are preferably made of metal, and more preferably aluminum or an aluminum alloy.

第１正極集電体６１０に設けられた貫通穴に、樹脂製の絶縁部材６３０（正極集電体ホルダ）に設けられた突起が挿入され、当該突起の先端を熱カシメ等により拡径することにより、接続部６３１が形成され、第１正極集電体６１０と絶縁部材６３０とを接続することができる。また、第１正極集電体６１０に設けられた貫通穴に絶縁部材６３０に設けられた突起を挿入することにより、ズレ防止部６３２を形成することができる。 A protrusion provided on a resin insulating member 630 (positive electrode current collector holder) is inserted into a through-hole provided in the first positive electrode current collector 610, and the tip of the protrusion is expanded in diameter by heat caulking or the like. Thus, a connection portion 631 is formed, and the first positive electrode current collector 610 and the insulating member 630 can be connected. Further, by inserting the projection provided on the insulating member 630 into the through hole provided on the first positive electrode current collector 610, the displacement preventing portion 632 can be formed.

第１正極集電体６１０に接続された絶縁部材６３０と、正極端子４００側の絶縁部材４２０とは、嵌合により接続される。なお、絶縁部材６３０に爪部を設け、当該爪部を絶縁部材４２０に引っ掛け接続することもできる。 The insulating member 630 connected to the first positive current collector 610 and the insulating member 420 on the side of the positive electrode terminal 400 are connected by fitting. Note that the insulating member 630 may be provided with a claw portion, and the claw portion may be hooked to the insulating member 420 for connection.

その後、絶縁部材６３０に設けられた開口部において、正極集電部材６００側の第１正極集電体６１０と、正極端子４００側の変形板４４０の中央部とが、レーザ溶接等により接続される。第１正極集電体６１０に接続用孔を設け、接続用孔の縁部を変形板４４０に溶接接続することが好ましい。 After that, in the opening provided in the insulating member 630, the first positive electrode current collector 610 on the side of the positive electrode current collecting member 600 and the central portion of the deformation plate 440 on the side of the positive electrode terminal 400 are connected by laser welding or the like. . It is preferable to provide a connection hole in the first positive electrode current collector 610 and weld the edge of the connection hole to the deformation plate 440 .

図８に示すように、絶縁部材６３０は、電極体２００側に突出する筒状部６３０Ａを有する。筒状部６３０Ａは、第２正極集電体６２０の第２開口６２０Ｂを貫通し、電解液注液孔１２１と連通する孔部６３０Ｂを規定する。 As shown in FIG. 8, the insulating member 630 has a tubular portion 630A protruding toward the electrode body 200 side. Cylindrical portion 630A penetrates second opening 620B of second positive electrode current collector 620 and defines hole portion 630B communicating with electrolyte injection hole 121 .

封口板１２０に正極集電部材６００を取り付ける際は、まず、第１正極集電体６１０が封口板１２０上の絶縁部材６３０に接続される。続いて、電極体２００に接続された第２正極集電体６２０が第１正極集電体６１０に取り付けられる。このとき、第２正極集電体６２０の一部が第１正極集電体６１０と重なるように第２正極集電体６２０が絶縁部材６３０上に配置される。続いて、第２正極集電体６２０に設けられた第１開口６２０Ａの周囲が、レーザ溶接等により第１正極集電体６１０に溶接接続される。 When attaching the positive electrode current collector 600 to the sealing plate 120 , first, the first positive electrode current collector 610 is connected to the insulating member 630 on the sealing plate 120 . Subsequently, the second positive current collector 620 connected to the electrode assembly 200 is attached to the first positive current collector 610 . At this time, the second positive current collector 620 is arranged on the insulating member 630 such that the second positive current collector 620 partially overlaps the first positive current collector 610 . Subsequently, the periphery of the first opening 620A provided in the second positive electrode current collector 620 is weld-connected to the first positive electrode current collector 610 by laser welding or the like.

次に、図７および図９を参照して、封口板１２０への負極集電部材７００の取付について説明する。 Next, attachment of the negative electrode current collecting member 700 to the sealing plate 120 will be described with reference to FIGS. 7 and 9. FIG.

封口板１２０の外面側に樹脂製の外部側絶縁部材５１０が配置される。封口板１２０の内面側に第１負極集電体７１０、および樹脂製の絶縁部材７３０（負極集電体ホルダ）が配置される。次に、負極端子５００が、外部側絶縁部材５１０の貫通孔、封口板１２０の負極端子取り付け孔、第１負極集電体７１０の貫通孔、および絶縁部材７３０の貫通孔に挿入される。そして、負極端子５００の先端が第１負極集電体７１０上にカシメ接続される。これにより、負極端子５００、外部側絶縁部材５１０、封口板１２０、第１負極集電体７１０、および絶縁部材７３０が固定される。なお、負極端子５００および第１負極集電体７１０のカシメ接続された部分は、レーザ溶接等により溶接接続されることが好ましい。 An external insulating member 510 made of resin is arranged on the outer surface side of the sealing plate 120 . A first negative electrode current collector 710 and a resin insulating member 730 (negative electrode current collector holder) are arranged on the inner surface side of the sealing plate 120 . Next, the negative terminal 500 is inserted into the through hole of the external insulating member 510 , the negative terminal mounting hole of the sealing plate 120 , the through hole of the first negative current collector 710 , and the through hole of the insulating member 730 . Then, the tip of the negative terminal 500 is crimped onto the first negative current collector 710 . Thereby, the negative electrode terminal 500, the external insulating member 510, the sealing plate 120, the first negative electrode current collector 710, and the insulating member 730 are fixed. It should be noted that the caulking-connected portions of the negative electrode terminal 500 and the first negative electrode current collector 710 are preferably weld-connected by laser welding or the like.

さらに、第２負極集電体７２０の一部が第１負極集電体７１０と重なるように、第２負極集電体７２０が絶縁部材７３０上に配置される。第２負極集電体７２０に設けられた第１開口７２０Ａにおいて、第２負極集電体７２０は第１負極集電体７１０にレーザ溶接等により溶接接続される。 Furthermore, the second negative electrode current collector 720 is arranged on the insulating member 730 such that a portion of the second negative electrode current collector 720 overlaps with the first negative electrode current collector 710 . The second negative electrode current collector 720 is welded to the first negative electrode current collector 710 by laser welding or the like at the first opening 720A provided in the second negative electrode current collector 720 .

封口板１２０に負極集電部材７００を取り付ける際は、まず、第１負極集電体７１０が封口板１２０上の絶縁部材７３０に接続される。続いて、電極体２００に接続された第２負極集電体７２０が第１負極集電体７１０に取り付けられる。このとき、第２負極集電体７２０の一部が第１負極集電体７１０と重なるように第２負極集電体７２０が絶縁部材７３０上に配置される。続いて、第２負極集電体７２０に設けられた第１開口７２０Ａの周囲が、レーザ溶接等により第１負極集電体７１０に溶接接続される。 When attaching the negative electrode current collector 700 to the sealing plate 120 , first, the first negative electrode current collector 710 is connected to the insulating member 730 on the sealing plate 120 . Subsequently, the second negative current collector 720 connected to the electrode assembly 200 is attached to the first negative current collector 710 . At this time, the second negative current collector 720 is arranged on the insulating member 730 such that the second negative current collector 720 partially overlaps the first negative current collector 710 . Subsequently, the periphery of the first opening 720A provided in the second negative electrode current collector 720 is welded to the first negative electrode current collector 710 by laser welding or the like.

図８に示される電流遮断機構８００の動作について説明する。電池ケース１００内の圧力が上昇することにより、変形板４４０の中央部が封口板１２０側に移動するように変形する。そして、電池ケース１００内の圧力が所定値以上となったとき、変形板４４０の変形に伴い、第１正極集電体６１０と変形板４４０との溶接接合部が破断する。これにより、正極板２００Ａから正極端子４００への導電経路が切断される。 The operation of the current interrupting mechanism 800 shown in FIG. 8 will be described. As the pressure in the battery case 100 increases, the central portion of the deformation plate 440 deforms to move toward the sealing plate 120 . Then, when the pressure in battery case 100 reaches or exceeds a predetermined value, deformable plate 440 deforms, and the weld joint between first positive electrode current collector 610 and deformable plate 440 breaks. Thereby, the conductive path from the positive electrode plate 200A to the positive electrode terminal 400 is cut off.

角形二次電池１が過充電状態となり電池ケース１００内の圧力が上昇したとき、電流遮断機構８００が作動し、正極板２００Ａから正極端子４００への導電経路が切断されることにより、更なる過充電の進行が防止される。 When the prismatic secondary battery 1 becomes overcharged and the pressure in the battery case 100 rises, the current interrupting mechanism 800 operates to cut off the conductive path from the positive electrode plate 200A to the positive electrode terminal 400, thereby further overcharging. Charging progress is prevented.

正極端子４００には貫通孔４００Ａが形成されている。貫通孔４００Ａを通じて導電部材４３０の内部側にガスを送り込むことにより、導電部材４３０と変形板４４０との溶接接続部のリーク検査を行なうことができる。貫通孔４００Ａは、樹脂製ないし金属製の端子封止部材により封止される。 A through hole 400A is formed in the positive electrode terminal 400 . By sending gas into the inside of the conductive member 430 through the through hole 400A, a leak test can be performed on the weld connection between the conductive member 430 and the deformation plate 440. FIG. The through hole 400A is sealed with a terminal sealing member made of resin or metal.

図１０は、封口板１２０と電極体２００とが接続された状態を示す図である。図１１は、封口板１２０と電極体２００とが接続された状態における正極集電部材６００周辺の拡大図である。 FIG. 10 is a diagram showing a state in which the sealing plate 120 and the electrode body 200 are connected. FIG. 11 is an enlarged view of the positive collector member 600 and its surroundings when the sealing plate 120 and the electrode body 200 are connected.

図７～図９を用いて説明したように、正極集電部材６００および負極集電部材７００を介して第１電極体要素２０１および第２電極体要素２０２が封口板１２０に取り付けられる。これにより、図１０に示すように、第１電極体要素２０１および第２電極体要素２０２が封口板１２０に接続され、電極体２００と正極端子４００および負極端子５００とが電気的に接続される。 As described with reference to FIGS. 7 to 9, the first electrode element 201 and the second electrode element 202 are attached to the sealing plate 120 with the positive collector member 600 and the negative collector member 700 interposed therebetween. Thereby, as shown in FIG. 10, the first electrode body element 201 and the second electrode body element 202 are connected to the sealing plate 120, and the electrode body 200 is electrically connected to the positive electrode terminal 400 and the negative electrode terminal 500. .

図１１に示すように、第１正極集電体６１０上に樹脂製のカバー部材９００が設けられる。カバー部材９００は、第１正極集電体６１０と電極体２００の間に位置する。カバー部材９００は、負極集電体側に設けられてもよい。また、カバー部材９００は必須の部材ではなく、適宜省略が可能である。 As shown in FIG. 11 , a cover member 900 made of resin is provided on the first positive electrode current collector 610 . The cover member 900 is positioned between the first positive current collector 610 and the electrode body 200 . The cover member 900 may be provided on the negative electrode current collector side. Also, the cover member 900 is not an essential member and can be omitted as appropriate.

図１０に示す状態から、第１電極体要素２０１と第２電極体要素２０２とが１つに纏められる。このとき、第１正極タブ群２１１Ａと第２正極タブ群２１２Ａとが互いに異なる方向に湾曲させられる。第１負極タブ群２１１Ｂと第２負極タブ群２１２Ｂとが互いに異なる方向に湾曲させられる。 From the state shown in FIG. 10, the first electrode body element 201 and the second electrode body element 202 are combined into one. At this time, the first positive electrode tab group 211A and the second positive electrode tab group 212A are bent in different directions. The first negative electrode tab group 211B and the second negative electrode tab group 212B are curved in different directions.

第１電極体要素２０１と第２電極体要素２０２とは、テープ等により１つに纏められ得る。代替的に、第１電極体要素２０１と第２電極体要素２０２とを、箱状ないし袋状に成形した絶縁シート内に配置することで１つに纏めることができる。さらに、第１電極体要素２０１と第２電極体要素２０２とを接着により固定することができる。 The first electrode body element 201 and the second electrode body element 202 can be put together by tape or the like. Alternatively, the first electrode body element 201 and the second electrode body element 202 can be integrated by arranging them in an insulating sheet molded into a box-like or bag-like shape. Furthermore, the first electrode body element 201 and the second electrode body element 202 can be fixed by adhesion.

１つに纏められた第１電極体要素２０１と第２電極体要素２０２とが絶縁シートで包まれ、角形外装体１１０に挿入される。その後、封口板１２０が角形外装体１１０に溶接接続され、角形外装体１１０の開口が封口板１２０により封口され、密閉された電池ケース１００が形成される。 The first electrode body element 201 and the second electrode body element 202 combined into one are wrapped with an insulating sheet and inserted into the rectangular outer body 110 . After that, the sealing plate 120 is welded to the rectangular outer body 110 and the opening of the rectangular outer body 110 is sealed with the sealing plate 120 to form the sealed battery case 100 .

その後、封口板１２０に設けられた電解液注液孔１２１から非水電解液が電池ケース１００に注液される。非水電解液としては、たとえば、エチレンカーボネート（ＥＣ）、エチルメチルカーボネート（ＥＭＣ）、およびジエチルカーボネート（ＤＥＣ）とを、体積比（２５℃）３０：３０：４０の割合で混合した非水溶媒に、ＬｉＰＦ6を１．２モル／Ｌの濃度で溶解させたものを用いることができる。 After that, a non-aqueous electrolyte is injected into the battery case 100 through an electrolyte injection hole 121 provided in the sealing plate 120 . The non-aqueous electrolyte is, for example, a non-aqueous solvent obtained by mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) at a volume ratio (25° C.) of 30:30:40. In addition, LiPF 6 dissolved at a concentration of 1.2 mol/L can be used.

非水電解液が注液された後、電解液注液孔１２１は封止部材１２２により封止される。以上の工程の実施により、角形二次電池１は完成する。 After the non-aqueous electrolyte is injected, the electrolyte injection hole 121 is sealed with a sealing member 122 . The prismatic secondary battery 1 is completed by performing the above steps.

以上に述べたとおり、角形二次電池１の製造方法は、電極体２００と第１正極集電体６１０とを接続する工程と、正極端子４００（端子部）および導電部材４３０を電池ケース１００の封口板１２０に取り付ける工程と、変形板４４０の上面を封口板１２０側に向け、変形板４４０の下面を電極体２００側に向けた状態で、封口板１２０に取付けられた導電部材４３０の開口部４３３を変形板４４０により封止する工程と、変形板４４０と第１正極集電体６１０とを接合する工程と、電極体２００を角形外装体１１０に収容し、角形外装体１１０を封口板１２０により封口する工程とを備える。 As described above, the method of manufacturing the prismatic secondary battery 1 includes the steps of connecting the electrode assembly 200 and the first positive current collector 610, and connecting the positive electrode terminal 400 (terminal portion) and the conductive member 430 to the battery case 100 a step of attaching the sealing plate 120; 433 is sealed with a deformation plate 440; bonding the deformation plate 440 and the first positive electrode current collector 610; and a step of sealing.

このようにして製造された角形二次電池１は、電極体２００と、電極体２００を収容する角形外装体１１０および角形外装体１１０を封口する封口板１２０を含む電池ケース１００と、封口板１２０に取付けられた正極端子４００（端子部）と、正極端子４００に接続され、電極体２００側に開口部４３３を有する導電部材４３０と、導電部材４３０の開口部４３３を封止する変形板４４０と、変形板４４０と接合される第１正極集電体６１０とを備える。 The prismatic secondary battery 1 manufactured in this manner includes an electrode body 200, a battery case 100 including a prismatic outer body 110 that houses the electrode body 200, and a sealing plate 120 that seals the prismatic outer body 110; a positive electrode terminal 400 (terminal portion) attached to the positive electrode terminal 400, a conductive member 430 having an opening 433 on the electrode body 200 side, and a deformation plate 440 sealing the opening 433 of the conductive member 430; , and a first positive current collector 610 joined to the deformation plate 440 .

電極体２００は、第１正極集電体６１０、変形板４４０、および導電部材４３０を介して正極端子４００と電気的に接続される。電池ケース１００内の圧力が所定値以上となったときに、変形板４４０が変形することに伴い、電極体２００と正極端子４００との間の電気的な接続が切断される。 The electrode body 200 is electrically connected to the positive terminal 400 via the first positive current collector 610 , the deformation plate 440 and the conductive member 430 . When the pressure inside the battery case 100 reaches or exceeds a predetermined value, the deformation plate 440 deforms, thereby disconnecting the electrical connection between the electrode body 200 and the positive electrode terminal 400 .

図１２は、変形板４４０の断面図であり、図１３は、変形板４４０の上面図であり、図１４は、変形板４４０の下面図である。 12 is a cross-sectional view of the deformation plate 440, FIG. 13 is a top view of the deformation plate 440, and FIG. 14 is a bottom view of the deformation plate 440. FIG.

変形板４４０は、図１３に示す封口板１２０側の上面（第１表面）と、図１４に示す電極体２００側の下面（第２表面）とを有する。変形板４４０は、厚肉部４４１と、薄肉部４４２とを有する。厚肉部４４１は、変形板４４０の中心を含む領域に設けられ、周囲と比較して相対的に厚みが大きい。薄肉部４４２は、厚肉部４４１の周囲に設けられ、厚肉部４４１と比較して相対的に厚みが小さい。 The deformation plate 440 has an upper surface (first surface) on the side of the sealing plate 120 shown in FIG. 13 and a lower surface (second surface) on the side of the electrode body 200 shown in FIG. The deformation plate 440 has a thick portion 441 and a thin portion 442 . The thick portion 441 is provided in a region including the center of the deformation plate 440 and has a relatively large thickness compared to the surrounding area. The thin portion 442 is provided around the thick portion 441 and has a relatively small thickness compared to the thick portion 441 .

変形板４４０の中央部に厚肉部４４１が設けられることにより、第１正極集電体６１０との溶接接合時の加工性が向上するとともに、変形板４４０の内周側の導電経路を大きくすることができる。この結果、意図しない大電流の通電時においても、変形板４４０上で溶断が生じることを防止し、異常時の気密性を確保することができる。 By providing the thick portion 441 in the central portion of the deformable plate 440, workability at the time of welding to the first positive electrode current collector 610 is improved, and the conductive path on the inner peripheral side of the deformable plate 440 is increased. be able to. As a result, it is possible to prevent fusing on the deformable plate 440 even when an unintended large current is applied, and to ensure airtightness in the event of an abnormality.

図１２、図１３に示すように、変形板４４０の上面において、厚肉部４４１よりも外周側であり、かつ、変形板４４０の中心からの距離が中心から変形板４４０の外周縁までの距離の半分よりも小さいＡ領域（第１領域）に環状の溝４４３Ａ（第１溝）が形成される。 As shown in FIGS. 12 and 13, on the upper surface of the deformation plate 440, the thick portion 441 is on the outer peripheral side, and the distance from the center of the deformation plate 440 is the distance from the center to the outer peripheral edge of the deformation plate 440. A ring-shaped groove 443A (first groove) is formed in an A region (first region) smaller than half of .

図１２、図１４に示すように、変形板４４０の下面において、変形板４４０の中心からの距離が中心から変形板４４０の外周縁までの距離の半分よりも大きいＢ領域（第２領域）に環状の溝４４３Ｂ（第２溝）が形成される。 As shown in FIGS. 12 and 14, on the lower surface of the deformation plate 440, in a region B (second region) where the distance from the center of the deformation plate 440 is greater than half the distance from the center to the outer peripheral edge of the deformation plate 440 An annular groove 443B (second groove) is formed.

なお、溝４４３Ａおよび溝４４３Ｂは、完全に環状でなくてもよく、部分的に溝が形成されない「略環状」のものであってもよい。「略環状」は、溝の周長に関して、完全な環状を１００％としたとき、６０％以上程度であることが好ましく、８０％以上程度であることがより好ましく、９０％以上程度であることがさらに好ましい。ただし、溝４４３Ａおよび溝４４３Ｂが周方向に分割される場合、分割された各溝は、「環状」の中心に関して対称な形状を有することが好ましい。 The grooves 443A and 443B may not be completely annular, and may be "substantially annular" in which no groove is formed partially. "Substantially annular" is preferably about 60% or more, more preferably about 80% or more, and about 90% or more when the circumference of the groove is 100%. is more preferred. However, if grooves 443A and 443B are divided circumferentially, each divided groove preferably has a symmetrical shape about the center of the "annulus."

図１７に示すように、変形板４４０は、溝４４３Ａおよび溝４４３Ｂの開口を閉じる方向の応力が変形板に生じた状態で第１正極集電体６１０に接合される。また、溝４４３Ａおよび溝４４３Ｂは、変形板４４０を第１正極集電体６１０から切り離した状態で、底部の幅よりも開口の幅が広い断面形状を有する。 As shown in FIG. 17, the deformable plate 440 is joined to the first positive electrode current collector 610 in a state in which stress is applied to the deformable plate in a direction to close the openings of the grooves 443A and 443B. In addition, the grooves 443A and 443B have a cross-sectional shape in which the width of the opening is wider than the width of the bottom when the deformation plate 440 is separated from the first positive electrode current collector 610 .

図１５は、図１２中のα部の周辺を示す拡大図であり、図１６は、図１２中のβ部の周辺を示す拡大図である。図１５、図１６に示すように、溝４４３Ａおよび溝４４３Ｂは、底部の幅よりも開口の幅が広い断面形状を有する。より具体的には、溝４４３Ａおよび溝４４３Ｂは、略Ｖ字状の断面形状を有する。 15 is an enlarged view showing the periphery of the α portion in FIG. 12, and FIG. 16 is an enlarged view showing the periphery of the β portion in FIG. As shown in FIGS. 15 and 16, the grooves 443A and 443B have cross-sectional shapes in which the width of the opening is wider than the width of the bottom. More specifically, groove 443A and groove 443B have a substantially V-shaped cross-sectional shape.

溝４４３Ａおよび溝４４３Ｂは、変形板４４０を第１正極集電体６１０から切り離した状態で、溝４４３Ａおよび溝４４３Ｂが形成された位置の変形板４４０の全厚（溝が形成されない場合の変形板４４０の厚み）の１／３以上１／２以下程度の深さを有することが好ましい。この程度の溝深さとすることで、変形板４４０の所望の変形を促進しながら、導電経路となる変形板４４０の断面積が過度に減少することを抑制することができる。 Grooves 443A and grooves 443B are formed in a state where deformation plate 440 is separated from first positive electrode current collector 610, and the total thickness of deformation plate 440 at positions where grooves 443A and grooves 443B are formed (deformation plate 440 when grooves are not formed) It is preferable to have a depth of about 1/3 or more and 1/2 or less of the thickness of 440). By setting the groove depth to this level, it is possible to promote the desired deformation of the deformation plate 440 while suppressing excessive reduction in the cross-sectional area of the deformation plate 440 serving as a conductive path.

なお、電池ケース１００内の圧力が上昇したとき、電流遮断機構８００においては、変形板４４０と第１正極集電体６１０との接合部が切断される。このとき、変形板４４０の溝４４３Ａおよび溝４４３Ｂが形成された部分は切断されない。 Note that when the pressure inside the battery case 100 rises, the joint between the deformable plate 440 and the first positive electrode current collector 610 is cut in the current interrupting mechanism 800 . At this time, the portions of the deformation plate 440 where the grooves 443A and 443B are formed are not cut.

また、角形二次電池１に大電流が流れたときも、変形板４４０の溝４４３Ａおよび溝４４３Ｂが形成された部分は溶断しない。このとき、他の脆弱部が溶断することにより、意図しない大電流は遮断される。 Moreover, even when a large current flows through the prismatic secondary battery 1, the portions of the deformation plate 440 where the grooves 443A and 443B are formed are not fused. At this time, an unintended large current is cut off by fusing other fragile portions.

変形板４４０を第１正極集電体６１０から切り離した状態で、溝４４３Ａの開口の幅を溝４４３Ｂの開口の幅よりも狭く形成してもよい。また、変形板４４０を第１正極集電体６１０から切り離した状態で、溝４４３Ａの深さを溝４４３Ｂの深さよりも小さく形成してもよい。 In a state in which the deformation plate 440 is separated from the first positive electrode current collector 610, the width of the opening of the groove 443A may be formed narrower than the width of the opening of the groove 443B. Further, the depth of the groove 443A may be formed smaller than the depth of the groove 443B in a state in which the deformation plate 440 is separated from the first positive electrode current collector 610 .

変形板４４０の内周側に位置する溝４４３Ａが形成された部分においては、外周側に位置する溝４４３Ｂが形成された部分よりも導電経路の断面積が小さくなり、通電による発熱は大きくなる傾向にある。溝４４３Ｂの開口の幅および深さを相対的に大きく、溝４４３Ａの開口の幅および深さを相対的に小さくすることにより、変形板４４０の所望の変形を促進しながら、導電経路の断面積の縮小を抑制することができる。 In the portion where the groove 443A located on the inner peripheral side of the deformation plate 440 is formed, the cross-sectional area of the conductive path becomes smaller than the portion where the groove 443B located on the outer peripheral side is formed, and the heat generated by the energization tends to increase. It is in. By making the width and depth of the opening of the groove 443B relatively large and the width and depth of the opening of the groove 443A relatively small, the cross-sectional area of the conductive path is increased while promoting the desired deformation of the deformation plate 440. reduction can be suppressed.

図１７は、変形板４４０を変形させて第１正極集電体６１０と接合した状態を示す断面図である。 FIG. 17 is a cross-sectional view showing a state in which the deformation plate 440 is deformed and joined to the first positive electrode current collector 610 .

図１７に示すように、変形板４４０は、厚肉部４４１が電極体２００側（図１７中下側）に移動するように変形した状態で第１正極集電体６１０に接合される。この変形は、正極端子４００に設けられた貫通孔４００Ａ（図８参照）から導電部材４３０の内部に窒素ガスなどのガス圧が導入されることによって生じる。 As shown in FIG. 17, the deformation plate 440 is joined to the first positive electrode current collector 610 in a state in which the thick portion 441 is deformed so as to move toward the electrode body 200 (lower side in FIG. 17). This deformation occurs when gas pressure such as nitrogen gas is introduced into the conductive member 430 through the through hole 400A (see FIG. 8) provided in the positive electrode terminal 400 .

変形板４４０の上記変形により封口板１２０側に近づいた厚肉部４４１が第１正極集電体６１０に溶接される。すなわち、変形板４４０は、溝４４３Ａおよび溝４４３Ｂの開口を閉じる方向の応力が変形板４４０に生じた状態で第１正極集電体６１０に接合される。 Due to the deformation of the deformation plate 440 , the thick portion 441 closer to the sealing plate 120 side is welded to the first positive electrode current collector 610 . That is, deformation plate 440 is joined to first positive electrode current collector 610 in a state in which stress is generated in deformation plate 440 in a direction to close the openings of grooves 443A and 443B.

溝４４３Ａおよび溝４４３Ｂが変形板４４０に形成されない構造においても、変形板４４０の中央部に位置する厚肉部４４１が封口板１２０側に移動するように変形した状態で変形板４４０は第１正極集電体６１０に接合される。ただし、変形板４４０の変形状態（変形後の形状、変形量）のばらつきに起因して、変形板４４０と第１正極集電体６１０との接合強度にばらつきが生じ得る。この結果、電流遮断機構８００の作動が不安定になり得る。 Even in a structure in which the grooves 443A and 443B are not formed in the deformation plate 440, the deformation plate 440 is deformed so that the thick portion 441 located in the central portion of the deformation plate 440 is moved toward the sealing plate 120, and the deformation plate 440 becomes the first positive electrode. Bonded to current collector 610 . However, variations in the deformation state (shape and amount of deformation after deformation) of the deformation plate 440 may cause variations in the bonding strength between the deformation plate 440 and the first positive electrode current collector 610 . As a result, the operation of current interrupting mechanism 800 may become unstable.

これに対し、本実施の形態に係る変形板４４０においては、変形板４４０の中央側に位置するＡ領域の上面に溝４４３Ａが形成され、変形板４４０の外周側に位置するＢ領域の下面に溝４４３Ｂが形成されているため、図１７に示す方向の変形が促進され、変形板４４０の変形後の形状が安定する。また、溝４４３Ａおよび溝４４３Ｂの開口が閉じることにより、それ以上の変形が抑制されるため、変形板４４０の変形量が安定する。このように、本実施の形態に係る変形板４４０によれば、変形板４４０の変形状態（変形後の形状、変形量）のばらつきを抑制することができるので、変形板４４０と第１正極集電体６１０との接合強度を安定させることができる。この結果、電流遮断機構８００の作動が安定する。 On the other hand, in deformation plate 440 according to the present embodiment, grooves 443A are formed on the upper surface of region A located on the central side of deformation plate 440, and grooves 443A are formed on the lower surface of region B located on the outer peripheral side of deformation plate 440. Since the groove 443B is formed, the deformation in the direction shown in FIG. 17 is promoted, and the shape of the deformation plate 440 after deformation is stabilized. Further, further deformation is suppressed by closing the openings of the grooves 443A and 443B, so that the amount of deformation of the deformation plate 440 is stabilized. As described above, according to the deformation plate 440 according to the present embodiment, it is possible to suppress variations in deformation state (shape after deformation, amount of deformation) of the deformation plate 440. The bonding strength with the electric body 610 can be stabilized. As a result, the operation of the current interrupting mechanism 800 is stabilized.

溝４４３Ａおよび溝４４３Ｂの一方のみを形成するようにしてもよい。その場合、外周側の溝４４３Ｂのみを形成することが好ましい。溝４４３Ａおよび溝４４３Ｂの開口の幅および深さは、変形板４４０が所望の形状に変形したときに、各溝の隙間が埋まる（開口が閉じる）ように形成することが好ましい。変形板４４０が所望の形状に変形したときに、溝４４３Ａおよび溝４４３Ｂの隙間が残る（開口が完全には閉じない）ように形成してもよい。 Only one of the grooves 443A and 443B may be formed. In that case, it is preferable to form only the groove 443B on the outer peripheral side. The width and depth of the openings of the grooves 443A and 443B are preferably formed so that the gaps between the grooves are filled (the openings are closed) when the deformation plate 440 is deformed into a desired shape. The grooves 443A and 443B may be formed so that gaps remain (openings are not completely closed) when the deformation plate 440 is deformed into a desired shape.

図１８は、変形板４４０に形成される溝の形状の変形例を示す図である。図１２～図１７に示す例では、略Ｖ字状の断面形状を示したが、略Ｖ字状の断面形状に代えて、図１８に示す略Ｕ字状の断面形状を有する溝４４３Ｃが用いられてもよい。溝４４３Ｃは、略Ｖ字状の場合と同様に、変形板４４０を第１正極集電体６１０から切り離した状態で、底部の幅よりも開口の幅が広い断面形状を有する。 18A and 18B are diagrams showing modifications of the shape of the grooves formed in the deformation plate 440. FIG. Although the examples shown in FIGS. 12 to 17 show a substantially V-shaped cross-sectional shape, grooves 443C having a substantially U-shaped cross-sectional shape shown in FIG. 18 are used instead of the substantially V-shaped cross-sectional shape. may be The groove 443C has a cross-sectional shape in which the width of the opening is wider than the width of the bottom when the deformation plate 440 is separated from the first positive electrode current collector 610, as in the case of the substantially V shape.

また、上述した真円形状に代えて、正方形の平面形状を有する変形板４４０が用いられてもよい。この場合、溝４４３Ａおよび溝４４３Ｂも正方形状に延びる。 Further, instead of the circular shape described above, a deformation plate 440 having a square planar shape may be used. In this case, the grooves 443A and 443B also extend in a square shape.

以上、本技術の実施の形態について説明したが、今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本技術の範囲は特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 Although the embodiments of the present technology have been described above, the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present technology is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope of equivalence to the scope of the claims.

１ 角形二次電池、１００ 電池ケース、１１０ 角形外装体、１２０ 封口板、１２１ 電解液注液孔、１２２ 封止部材、１２３ ガス排出弁、２００ 電極体、２００Ａ 正極板、２００Ｂ 負極板、２０１ 第１電極体要素、２０２ 第２電極体要素、２１０Ａ 正極タブ、２１０Ｂ 負極タブ、２１１Ａ 第１正極タブ群、２１１Ｂ 第１負極タブ群、２１２Ａ 第２正極タブ群、２１２Ｂ 第２負極タブ群、２１３ 溶接接続部、２２０Ａ 本体部、２２０Ｂ 本体部、２３０Ａ 正極保護層、３００ 絶縁シート、４００ 正極端子、４００Ａ 貫通孔、４１０ 外部側絶縁部材、４２０ 絶縁部材、４３０ 導電部材、４３１ 導電部材ベース部、４３２ 管状部、４３３ 開口部、４４０ 変形板、５００ 負極端子、５１０ 外部側絶縁部材、６００ 正極集電部材、６１０ 第１正極集電体、６２０ 第２正極集電体、６２０Ａ 第１開口、６２０Ｂ 第２開口、６３０ 絶縁部材、６３０Ａ 筒状部、６３０Ｂ 孔部、６３１ 接続部、６３２ ズレ防止部、７００ 負極集電部材、７１０ 第１負極集電体、７２０ 第２負極集電体、７２０Ａ 第１開口、７３０ 絶縁部材、８００ 電流遮断機構、９００ カバー部材。 1 prismatic secondary battery 100 battery case 110 prismatic exterior body 120 sealing plate 121 electrolyte injection hole 122 sealing member 123 gas discharge valve 200 electrode assembly 200A positive electrode plate 200B negative electrode plate 201 second 1 electrode body element 202 second electrode body element 210A positive electrode tab 210B negative electrode tab 211A first positive electrode tab group 211B first negative electrode tab group 212A second positive electrode tab group 212B second negative electrode tab group 213 welding Connection part 220A main body part 220B main body part 230A positive electrode protective layer 300 insulating sheet 400 positive electrode terminal 400A through hole 410 external side insulating member 420 insulating member 430 conductive member 431 conductive member base portion 432 tubular shape Part 433 Opening 440 Deformable plate 500 Negative electrode terminal 510 External insulating member 600 Positive electrode collector 610 First positive collector 620 Second positive collector 620A First opening 620B Second Opening 630 Insulating member 630A Cylindrical portion 630B Hole 631 Connecting portion 632 Displacement preventing portion 700 Negative collector 710 First negative collector 720 Second negative collector 720A First opening , 730 insulating member, 800 current interrupting mechanism, 900 cover member.

Claims (18)

電極体と、
前記電極体を収容する外装体および前記外装体を封口する封口板を含む電池ケースと、
前記封口板に取付けられた端子部と、
前記端子部に接続され、前記電極体側に開口部を有する導電部材と、
前記導電部材の前記開口部を封止する変形板と、
前記変形板と接合される集電体とを備え、
前記電極体は、前記集電体、前記変形板、および前記導電部材を介して前記端子部と電気的に接続され、
前記電池ケース内の圧力が所定値以上となったときに、前記変形板が変形することに伴い、前記電極体と前記端子部との間の電気的な接続が切断され、
前記変形板は、前記封口板側の第１表面と、前記電極体側の第２表面とを有し、前記変形板はさらに、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部を有し、
前記変形板の前記第１表面上において、前記厚肉部よりも外周側であり、かつ、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも小さい領域に略環状の溝が形成され、
前記溝は、前記変形板を前記集電体から切り離した状態で、略Ｖ字状の断面形状を有し、
前記溝の開口を閉じる方向の応力が前記変形板に生じた状態で前記変形板が前記集電体に接合される、電池。 an electrode body;
a battery case including an exterior body that houses the electrode body and a sealing plate that seals the exterior body;
a terminal portion attached to the sealing plate;
a conductive member connected to the terminal portion and having an opening on the electrode body side;
a deformation plate that seals the opening of the conductive member;
A current collector joined to the deformation plate,
the electrode body is electrically connected to the terminal portion via the current collector, the deformation plate, and the conductive member;
When the pressure in the battery case reaches or exceeds a predetermined value, the deformation plate is deformed, thereby disconnecting the electrical connection between the electrode body and the terminal portion,
The deformation plate has a first surface on the side of the sealing plate and a second surface on the side of the electrode body, and the deformation plate further has a region including the center thereof that is relatively thicker than the surrounding area. having a large thick part,
On the first surface of the deformation plate, the thick portion is on the outer peripheral side, and the distance from the center of the deformation plate is longer than half the distance from the center to the outer peripheral edge of the deformation plate. A substantially annular groove is formed in a small area ,
the groove has a substantially V-shaped cross-sectional shape in a state in which the deformation plate is separated from the current collector;
The battery, wherein the deformable plate is joined to the current collector in a state in which stress is applied to the deformable plate in a direction to close the opening of the groove. 電極体と、
前記電極体を収容する外装体および前記外装体を封口する封口板を含む電池ケースと、
前記封口板に取付けられた端子部と、
前記端子部に接続され、前記電極体側に開口部を有する導電部材と、
前記導電部材の前記開口部を封止する変形板と、
前記変形板と接合される集電体とを備え、
前記電極体は、前記集電体、前記変形板、および前記導電部材を介して前記端子部と電気的に接続され、
前記電池ケース内の圧力が所定値以上となったときに、前記変形板が変形することに伴い、前記電極体と前記端子部との間の電気的な接続が切断され、
前記変形板は、前記封口板側の第１表面と、前記電極体側の第２表面とを有し、
前記変形板の前記第２表面上において、前記変形板の中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも大きい領域に略環状の溝が形成され、
前記溝は、前記変形板を前記集電体から切り離した状態で、略Ｖ字状の断面形状を有し、
前記溝の開口を閉じる方向の応力が前記変形板に生じた状態で前記変形板が前記集電体に接合される、電池。 an electrode body;
a battery case including an exterior body that houses the electrode body and a sealing plate that seals the exterior body;
a terminal portion attached to the sealing plate;
a conductive member connected to the terminal portion and having an opening on the electrode body side;
a deformation plate that seals the opening of the conductive member;
A current collector joined to the deformation plate,
the electrode body is electrically connected to the terminal portion via the current collector, the deformation plate, and the conductive member;
When the pressure in the battery case reaches or exceeds a predetermined value, the deformation plate is deformed, thereby disconnecting the electrical connection between the electrode body and the terminal portion,
The deformation plate has a first surface on the side of the sealing plate and a second surface on the side of the electrode body,
A substantially annular groove is formed on the second surface of the deformation plate in a region where the distance from the center of the deformation plate is greater than half the distance from the center to the outer peripheral edge of the deformation plate ,
the groove has a substantially V-shaped cross-sectional shape in a state in which the deformation plate is separated from the current collector;
The battery, wherein the deformable plate is joined to the current collector in a state in which stress is applied to the deformable plate in a direction to close the opening of the groove. 電極体と、an electrode body;
前記電極体を収容する外装体および前記外装体を封口する封口板を含む電池ケースと、a battery case including an exterior body that houses the electrode body and a sealing plate that seals the exterior body;
前記封口板に取付けられた端子部と、a terminal portion attached to the sealing plate;
前記端子部に接続され、前記電極体側に開口部を有する導電部材と、a conductive member connected to the terminal portion and having an opening on the electrode body side;
前記導電部材の前記開口部を封止する変形板と、a deformation plate that seals the opening of the conductive member;
前記変形板と接合される集電体とを備え、A current collector joined to the deformation plate,
前記電極体は、前記集電体、前記変形板、および前記導電部材を介して前記端子部と電気的に接続され、the electrode body is electrically connected to the terminal portion via the current collector, the deformation plate, and the conductive member;
前記電池ケース内の圧力が所定値以上となったときに、前記変形板が変形することに伴い、前記電極体と前記端子部との間の電気的な接続が切断され、When the pressure in the battery case reaches or exceeds a predetermined value, the deformation plate is deformed, thereby disconnecting the electrical connection between the electrode body and the terminal portion,
前記変形板は、前記封口板側の第１表面と、前記電極体側の第２表面とを有し、前記変形板はさらに、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部を有し、The deformation plate has a first surface on the side of the sealing plate and a second surface on the side of the electrode body, and the deformation plate further has a region including the center thereof that is relatively thicker than the surrounding area. having a large thick part,
前記変形板の前記第１表面上において、前記厚肉部よりも外周側であり、かつ、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも小さい領域に略環状の溝が形成され、前記溝の断面全体が前記領域内にあり、On the first surface of the deformation plate, the thick portion is on the outer peripheral side, and the distance from the center of the deformation plate is longer than half the distance from the center to the outer peripheral edge of the deformation plate. forming a substantially annular groove in a small area, the entire cross-section of said groove being within said area;
前記溝の開口を閉じる方向の応力が前記変形板に生じた状態で前記変形板が前記集電体に接合される、電池。The battery, wherein the deformable plate is joined to the current collector in a state in which stress is applied to the deformable plate in a direction to close the opening of the groove. 前記溝は、前記変形板を前記集電体から切り離した状態で、前記溝が形成された位置の前記変形板の全厚の１／３以上１／２以下の深さを有する、請求項１から請求項３のいずれか１項に記載の電池。 2. The groove has a depth of 1/3 or more and 1/2 or less of the total thickness of the deformation plate at the position where the groove is formed in a state where the deformation plate is separated from the current collector. 4. The battery of any one of claims 3 to 4 . 電極体と、
前記電極体を収容する外装体および前記外装体を封口する封口板を含む電池ケースと、
前記封口板に取付けられた端子部と、
前記端子部に接続され、前記電極体側に開口部を有する導電部材と、
前記導電部材の前記開口部を封止する変形板と、
前記変形板と接合される集電体とを備え、
前記電極体は、前記集電体、前記変形板、および前記導電部材を介して前記端子部と電気的に接続され、
前記電池ケース内の圧力が所定値以上となったときに、前記変形板が変形することに伴い、前記電極体と前記端子部との間の電気的な接続が切断され、
前記変形板は、前記封口板側の第１表面と、前記電極体側の第２表面とを有し、前記変形板はさらに、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部を有し、
前記変形板の前記第１表面上において、前記厚肉部よりも外周側であり、かつ、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも小さい第１領域に略環状の第１溝が形成され、
前記変形板の前記第２表面上において、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも大きい第２領域に略環状の第２溝が形成され、
前記第１溝および前記第２溝の開口を閉じる方向の応力が前記変形板に生じた状態で前記変形板が前記集電体に接合され、
前記変形板を前記集電体から切り離した状態で、前記第１溝の開口の幅は前記第２溝の開口の幅よりも狭い、電池。 an electrode body;
a battery case including an exterior body that houses the electrode body and a sealing plate that seals the exterior body;
a terminal portion attached to the sealing plate;
a conductive member connected to the terminal portion and having an opening on the electrode body side;
a deformation plate that seals the opening of the conductive member;
A current collector joined to the deformation plate,
the electrode body is electrically connected to the terminal portion via the current collector, the deformation plate, and the conductive member;
When the pressure in the battery case reaches or exceeds a predetermined value, the deformation plate is deformed, thereby disconnecting the electrical connection between the electrode body and the terminal portion,
The deformation plate has a first surface on the side of the sealing plate and a second surface on the side of the electrode body, and the deformation plate further has a region including the center thereof that is relatively thicker than the surrounding area. having a large thick part,
On the first surface of the deformation plate, the thick portion is on the outer peripheral side, and the distance from the center of the deformation plate is longer than half the distance from the center to the outer peripheral edge of the deformation plate. A substantially annular first groove is formed in the small first region,
A substantially annular second groove is formed on the second surface of the deformation plate in a second region where the distance from the center of the deformation plate is greater than half the distance from the center to the outer peripheral edge of the deformation plate. is,
The deformation plate is joined to the current collector in a state in which stress in the direction of closing the openings of the first groove and the second groove is generated in the deformation plate ,
The battery, wherein the width of the opening of the first groove is narrower than the width of the opening of the second groove when the deformable plate is separated from the current collector. 前記第１溝および前記第２溝は、前記変形板を前記集電体から切り離した状態で、底部の幅よりも開口の幅が広い断面形状を有する、請求項５に記載の電池。 6. The battery according to claim 5, wherein said first groove and said second groove have a cross-sectional shape in which the width of the opening is wider than the width of the bottom when the deformable plate is separated from the current collector. 前記変形板を前記集電体から切り離した状態で、前記第１溝の深さは前記第２溝の深さよりも小さい、請求項５または請求項６に記載の電池。 7. The battery according to claim 5, wherein the depth of the first groove is smaller than the depth of the second groove when the deformable plate is separated from the current collector. 前記第１溝および前記第２溝は、前記変形板を前記集電体から切り離した状態で、略Ｖ字状の断面形状を有する、請求項５から請求項７のいずれか１項に記載の電池。 8. The first groove and the second groove according to any one of claims 5 to 7 , wherein the deformation plate is separated from the current collector and has a substantially V-shaped cross-sectional shape. battery. 前記変形板は、真円または正方形の平面形状を有する、請求項１から請求項８のいずれか１項に記載の電池。 The battery according to any one of claims 1 to 8, wherein the deformable plate has a perfect circular or square planar shape. 電極体と集電体とを接続する工程と、
端子部および導電部材を電池ケースの封口板に取り付ける工程と、
第１表面および第２表面を有し、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部が形成された変形板を準備する工程と、
前記変形板の前記第１表面上において、前記厚肉部よりも外周側であり、かつ、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも小さい領域に略Ｖ字状の断面形状を有する略環状の溝を形成する工程と、
前記変形板の前記第１表面を前記封口板側に向け、前記変形板の前記第２表面を前記電極体側に向けた状態で、前記封口板に取付けられた前記導電部材の開口部を前記変形板により封止する工程と、
前記溝の開口を閉じる方向に前記変形板を変形させた状態で前記変形板と前記集電体とを接合することにより、前記集電体、前記変形板、および前記導電部材を介して前記電極体と前記端子部と電気的に接続する工程と、
前記電極体を外装体に収容し、前記外装体を前記封口板により封口する工程とを備えた、電池の製造方法。 a step of connecting the electrode body and the current collector;
A step of attaching the terminal portion and the conductive member to the sealing plate of the battery case;
A step of preparing a deformation plate having a first surface and a second surface and having a thick portion relatively thicker than the surrounding area in a region including the center thereof;
On the first surface of the deformation plate, the thick portion is on the outer peripheral side, and the distance from the center of the deformation plate is longer than half the distance from the center to the outer peripheral edge of the deformation plate. forming a substantially annular groove having a substantially V-shaped cross-sectional shape in a small area;
With the first surface of the deformation plate facing the sealing plate side and the second surface of the deformation plate facing the electrode body side, the opening of the conductive member attached to the sealing plate is deformed. a step of sealing with a plate;
By joining the deformable plate and the current collector in a state in which the deformable plate is deformed in a direction to close the opening of the groove, the electrode is deformed through the current collector, the deformable plate, and the conductive member. electrically connecting the body and the terminal portion;
A method of manufacturing a battery, comprising the step of housing the electrode assembly in an exterior body and sealing the exterior body with the sealing plate. 電極体と集電体とを接続する工程と、
端子部および導電部材を電池ケースの封口板に取り付ける工程と、
第１表面および第２表面を有し、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部が形成された変形板を準備する工程と、
前記変形板の前記第２表面上において、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも大きい領域に略Ｖ字状の断面形状を有する略環状の溝を形成する工程と、
前記変形板の前記第１表面を前記封口板側に向け、前記変形板の前記第２表面を前記電極体側に向けた状態で、前記封口板に取付けられた前記導電部材の開口部を前記変形板により封止する工程と、
前記溝の開口を閉じる方向に前記変形板を変形させた状態で前記変形板と前記集電体とを接合することにより、前記集電体、前記変形板、および前記導電部材を介して前記電極体と前記端子部と電気的に接続する工程と、
前記電極体を外装体に収容し、前記外装体を前記封口板により封口する工程とを備えた、電池の製造方法。 a step of connecting the electrode body and the current collector;
A step of attaching the terminal portion and the conductive member to the sealing plate of the battery case;
A step of preparing a deformation plate having a first surface and a second surface and having a thick portion relatively thicker than the surrounding area in a region including the center thereof;
On the second surface of the deformation plate, a substantially V-shaped cross-sectional shape is formed in a region where the distance from the center of the deformation plate is greater than half of the distance from the center to the outer peripheral edge of the deformation plate. forming an annular groove;
With the first surface of the deformation plate facing the sealing plate side and the second surface of the deformation plate facing the electrode body side, the opening of the conductive member attached to the sealing plate is deformed. a step of sealing with a plate;
By joining the deformable plate and the current collector in a state in which the deformable plate is deformed in a direction to close the opening of the groove, the electrode is deformed through the current collector, the deformable plate, and the conductive member. electrically connecting the body and the terminal portion;
A method of manufacturing a battery, comprising the step of housing the electrode assembly in an exterior body and sealing the exterior body with the sealing plate. 電極体と集電体とを接続する工程と、a step of connecting the electrode body and the current collector;
端子部および導電部材を電池ケースの封口板に取り付ける工程と、A step of attaching the terminal portion and the conductive member to the sealing plate of the battery case;
第１表面および第２表面を有し、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部が形成された変形板を準備する工程と、A step of preparing a deformation plate having a first surface and a second surface and having a thick portion relatively thicker than the surrounding area in a region including the center thereof;
前記変形板の前記第１表面上において、前記厚肉部よりも外周側であり、かつ、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも小さい領域に略環状の溝を前記溝の断面全体が前記領域内に位置するように形成する工程と、On the first surface of the deformation plate, the thick portion is on the outer peripheral side, and the distance from the center of the deformation plate is longer than half the distance from the center to the outer peripheral edge of the deformation plate. forming a substantially annular groove in a small area such that the entire cross section of the groove lies within the area;
前記変形板の前記第１表面を前記封口板側に向け、前記変形板の前記第２表面を前記電極体側に向けた状態で、前記封口板に取付けられた前記導電部材の開口部を前記変形板により封止する工程と、With the first surface of the deformation plate facing the sealing plate side and the second surface of the deformation plate facing the electrode body side, the opening of the conductive member attached to the sealing plate is deformed. a step of sealing with a plate;
前記溝の開口を閉じる方向に前記変形板を変形させた状態で前記変形板と前記集電体とを接合することにより、前記集電体、前記変形板、および前記導電部材を介して前記電極体と前記端子部と電気的に接続する工程と、By joining the deformable plate and the current collector in a state in which the deformable plate is deformed in a direction to close the opening of the groove, the electrode is deformed through the current collector, the deformable plate, and the conductive member. electrically connecting the body and the terminal portion;
前記電極体を外装体に収容し、前記外装体を前記封口板により封口する工程とを備えた、電池の製造方法。A method of manufacturing a battery, comprising the step of housing the electrode assembly in an exterior body and sealing the exterior body with the sealing plate. 前記溝は、前記変形板を前記集電体から切り離した状態で、前記溝が形成された位置の前記変形板の全厚の１／３以上１／２以下の深さを有する、請求項１０から請求項１２のいずれか１項に記載の電池の製造方法。 11. The groove has a depth of 1/3 or more and 1/2 or less of the total thickness of the deformation plate at the position where the groove is formed in a state in which the deformation plate is separated from the current collector. 13. The method of manufacturing a battery according to any one of claims 12 to 12 . 電極体と集電体とを接続する工程と、
端子部および導電部材を電池ケースの封口板に取り付ける工程と、
第１表面および第２表面を有し、その中心を含む領域に、周囲と比較して相対的に厚みが大きい厚肉部が形成された変形板を準備する工程と、
前記変形板の前記第１表面上において、前記厚肉部よりも外周側であり、かつ、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも小さい第１領域に略環状の第１溝を形成する工程と、
前記変形板の前記第２表面上において、前記変形板の前記中心からの距離が前記中心から前記変形板の外周縁までの距離の半分よりも大きい第２領域に略環状の第２溝を形成する工程と、
前記変形板の前記第１表面を前記封口板側に向け、前記変形板の前記第２表面を前記電極体側に向けた状態で、前記封口板に取付けられた前記導電部材の開口部を前記変形板により封止する工程と、
前記第１溝および前記第２溝の開口を閉じる方向に前記変形板を変形させた状態で前記変形板と前記集電体とを接合することにより、前記集電体、前記変形板、および前記導電部材を介して前記電極体と前記端子部と電気的に接続する工程と、
前記電極体を外装体に収容し、前記外装体を前記封口板により封口する工程とを備え、
前記変形板を前記集電体から切り離した状態で、前記第１溝の開口の幅は前記第２溝の開口の幅よりも狭い、電池の製造方法。 a step of connecting the electrode body and the current collector;
A step of attaching the terminal portion and the conductive member to the sealing plate of the battery case;
A step of preparing a deformation plate having a first surface and a second surface and having a thick portion relatively thicker than the surrounding area in a region including the center thereof;
On the first surface of the deformation plate, the thick portion is on the outer peripheral side, and the distance from the center of the deformation plate is longer than half the distance from the center to the outer peripheral edge of the deformation plate. forming a substantially annular first groove in the small first region;
A substantially annular second groove is formed on the second surface of the deformation plate in a second region where the distance from the center of the deformation plate is greater than half the distance from the center to the outer peripheral edge of the deformation plate. and
With the first surface of the deformation plate facing the sealing plate side and the second surface of the deformation plate facing the electrode body side, the opening of the conductive member attached to the sealing plate is deformed. a step of sealing with a plate;
The current collector, the deformation plate, and the electrically connecting the electrode body and the terminal portion via a conductive member;
housing the electrode body in an exterior body and sealing the exterior body with the sealing plate ;
The method for manufacturing a battery, wherein the width of the opening of the first groove is narrower than the width of the opening of the second groove when the deformable plate is separated from the current collector. 前記第１溝および前記第２溝は、前記変形板を前記集電体から切り離した状態で、底部の幅よりも開口の幅が広い断面形状を有する、請求項１４に記載の電池の製造方法。 15. The method of manufacturing a battery according to claim 14, wherein said first groove and said second groove have cross-sectional shapes in which the width of the opening is wider than the width of the bottom when the deformable plate is separated from the current collector. . 前記変形板を前記集電体から切り離した状態で、前記第１溝の深さは前記第２溝の深さよりも小さい、請求項１４または請求項１５に記載の電池の製造方法。 16. The method of manufacturing a battery according to claim 14, wherein the depth of the first groove is smaller than the depth of the second groove when the deformable plate is separated from the current collector. 前記第１溝および前記第２溝は、前記変形板を前記集電体から切り離した状態で、略Ｖ字状の断面形状を有する、請求項１４から請求項１６のいずれか１項に記載の電池の製造方法。 17. The first groove and the second groove according to any one of claims 14 to 16 , wherein the deformable plate is separated from the current collector and has a substantially V-shaped cross-sectional shape. Battery manufacturing method. 前記変形板は、真円または正方形の平面形状を有する、請求項１０から請求項１７のいずれか１項に記載の電池の製造方法。 18. The method of manufacturing a battery according to any one of claims 10 to 17 , wherein the deformation plate has a perfect circular or square planar shape.
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