JP2019012638A - Power storage device and manufacturing method thereof - Google Patents

Power storage device and manufacturing method thereof Download PDF

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JP2019012638A
JP2019012638A JP2017128813A JP2017128813A JP2019012638A JP 2019012638 A JP2019012638 A JP 2019012638A JP 2017128813 A JP2017128813 A JP 2017128813A JP 2017128813 A JP2017128813 A JP 2017128813A JP 2019012638 A JP2019012638 A JP 2019012638A
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current collector
negative electrode
external terminal
collector plate
positive
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JP6892338B2 (en
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博昭 江川
Hiroaki Egawa
博昭 江川
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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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

Abstract

To provide a power storage device capable of improving a bonding state between an external terminal and a current collector plate.SOLUTION: A power storage device 100 includes a power storage element 3, current collector plates 24 and 44, a battery container, external terminals 12 and 14 provided on one side portion 6 of the battery container and connected to the current collector plates 24 and 44. The external terminals 12 and 14 have shaft portions 12a and 14a penetrating through opening portions 26 and 46 of the current collector plates 24 and 44, and the shaft portions 12a and 14a include a caulked portion caulked to the current collector plates 24 and 44, a joint portion 29 is provided at a contact portion 28 between the outer periphery of the caulked portion of the shaft portion 12a and 14a and the peripheral portion of the opening portions of the current collector plates 24 and 44.SELECTED DRAWING: Figure 8

Description

本発明は、蓄電装置および蓄電装置の製造方法に関する。   The present invention relates to a power storage device and a method for manufacturing the power storage device.

近年、ハイブリッド電気自動車や純粋な電気自動車等の動力源として、大容量かつ高出力なリチウムイオン等の二次電池が注目されている。二次電池は、電池容器内に収容された蓄電要素に集電接続体を介して接続される外部端子を備えている。
集電接続体と外部端子との接続構造の一例として下記のものがある。
貫通孔を有する蓋体の外面側に、蓋体の貫通孔に対応する開口が形成され、蓋体の貫通孔の軸方向に延在する立ち上げ部を有する絶縁部材を配置し、鍔部を有するリベットの軸部を、蓋体の内面側から外面側に向けて、蓋体の貫通孔および絶縁部材の開口を貫通する。そして、貫通されたリベットの先端部をかしめ、リベットとのかしめ部および絶縁部材の立ち上げ部を直角に屈曲して蓋体の外面に密着するように積層する。この状態では、リベットおよび絶縁部材の立ち上げ部の先端面は、蓋体の外面に垂直になっている。この後、蓋体の上面に対して垂直面となった、リベット先端面と絶縁部材の立ち上げ部の先端面とを蓋体の外面に溶接する（例えば、特許文献１参照）。 2. Description of the Related Art In recent years, a secondary battery such as a high-capacity and high-power lithium ion has attracted attention as a power source for hybrid electric vehicles and pure electric vehicles. The secondary battery includes an external terminal connected to a power storage element accommodated in the battery container via a current collector connection body.
An example of the connection structure between the current collector connector and the external terminal is as follows.
An insulating member having a rising portion extending in the axial direction of the through-hole of the lid body is disposed on the outer surface side of the lid body having the through-hole, and an opening corresponding to the through-hole of the lid body is disposed. The shaft portion of the rivet that is provided passes through the through hole of the lid and the opening of the insulating member from the inner surface side to the outer surface side of the lid body. Then, the leading end of the penetrated rivet is caulked, and the caulking portion with the rivet and the rising portion of the insulating member are bent at right angles and laminated so as to be in close contact with the outer surface of the lid. In this state, the leading end surface of the rising portion of the rivet and the insulating member is perpendicular to the outer surface of the lid. Thereafter, the rivet tip surface and the tip surface of the rising portion of the insulating member, which are perpendicular to the top surface of the lid, are welded to the outer surface of the lid (for example, see Patent Document 1).

特開２００４−１４１７３号公報JP 2004-14173 A

通常、リベットの先端面の周縁部は、側面に対して完全に直角に形成されず、面取り状の円みが形成されている。このため、上記特許文献１の図面には図示されている従来技術では、リベットの先端面の周縁部と溶接時の溶融金属により形成される溶接部との間に隙間が形成される可能性がある。このように、リベットの先端面の周縁部と溶接部との間に隙間が介在されると、接合強度や接合抵抗などの接合品質が低下する。   Usually, the peripheral edge portion of the tip surface of the rivet is not formed at a right angle to the side surface, and a chamfered round shape is formed. For this reason, in the prior art shown in the drawing of Patent Document 1, there is a possibility that a gap is formed between the peripheral portion of the tip surface of the rivet and the welded portion formed by the molten metal at the time of welding. is there. As described above, when a gap is interposed between the peripheral edge portion of the tip surface of the rivet and the welded portion, bonding quality such as bonding strength and bonding resistance is deteriorated.

本発明の一態様によると、蓄電装置は、蓄電要素と、開口部を有し、前記蓄電要素に接続される集電板と、前記集電板および前記蓄電要素を収納する電池容器と、前記電池容器の一側部に設けられ、前記集電板に接続される外部端子とを備え、前記外部端子は前記集電板の前記開口部に貫通された軸部を有し、前記軸部は、前記集電板にかしめられたかしめ部を有し、前記軸部のかしめ部と前記集電板の前記開口部との接触部に接合部が設けられている。
本発明の一態様によると、蓄電装置の製造方法は、蓄電要素と、開口部を有し、前記蓄電要素に接続される集電板と、前記貫通孔に貫通される軸部を有する外部端子とを備えた蓄電装置の製造方法であって、前記外部端子の前記軸部を前記集電板の前記開口部に貫通して、前記軸部を前記集電板にかしめることと、前記軸部のかしめ部の外周と前記集電板の前記開口部の周縁部の接触部とを接合すること、とを有する。 According to one aspect of the present invention, a power storage device includes a power storage element, a current collector having an opening and connected to the power storage element, a battery container that houses the current collector and the power storage element, and An external terminal provided on one side of the battery container and connected to the current collector plate, the external terminal having a shaft portion penetrating through the opening of the current collector plate, the shaft portion being The current collecting plate has a caulking portion, and a joint portion is provided at a contact portion between the caulking portion of the shaft portion and the opening portion of the current collecting plate.
According to one aspect of the present invention, a method for manufacturing a power storage device includes a power storage element, a current collector plate having an opening, connected to the power storage element, and an external terminal having a shaft portion penetrating the through hole. A method of manufacturing a power storage device, comprising: penetrating the shaft portion of the external terminal into the opening of the current collector plate and caulking the shaft portion to the current collector plate; Joining the outer periphery of the caulking part of the part and the contact part of the peripheral part of the opening of the current collector plate.

本発明によれば、良好な接合状態を得ることができる。   According to the present invention, a good bonded state can be obtained.

本発明の二次電池の第１の実施形態を示す外観斜視図。1 is an external perspective view showing a first embodiment of a secondary battery of the present invention. 図１に図示された二次電池の分解斜視図。FIG. 2 is an exploded perspective view of the secondary battery illustrated in FIG. 1. 図２に図示された捲回電極群の分解斜視図。FIG. 3 is an exploded perspective view of the wound electrode group illustrated in FIG. 2. 図２に図示された電池蓋組立体の負極側における外観斜視図。FIG. 3 is an external perspective view of the battery lid assembly shown in FIG. 2 on the negative electrode side. 図４に図示された電池蓋組立体の負極側の分解斜視図。FIG. 5 is an exploded perspective view of the battery lid assembly shown in FIG. 4 on the negative electrode side. 電池蓋組立体の電池蓋に外部端子を固定する方法を説明するための図であり、外部端子を集電板にかしめた状態を示す断面図。It is a figure for demonstrating the method to fix an external terminal to the battery cover of a battery cover assembly, and sectional drawing which shows the state which crimped the external terminal to the current collecting plate. 図６に続く工程を説明するための断面図。Sectional drawing for demonstrating the process following FIG. 図７に続く工程を説明するための断面図。Sectional drawing for demonstrating the process following FIG. 本発明の第２の実施形態を示す断面図。Sectional drawing which shows the 2nd Embodiment of this invention. 本発明の第３の実施形態を示す断面図。Sectional drawing which shows the 3rd Embodiment of this invention.

−第１の実施形態−
以下、図１〜図８を参照して本発明の第１の実施形態を説明する。
図１は、扁平捲回形の二次電池の外観斜視図であり、図２は、図１に図示された二次電池の分解斜視図である。
二次電池１００は、電池容器を形成する電池缶１および電池蓋６を備える。電池缶１は、扁平な箱型形状を有する角形二次電池であり、相対的に面積の大きい一対の対向する幅広側面１ｂと、相対的に面積の小さい一対の対向する幅狭側面１ｃと、底面１ｄを有し、その上方に開口部１ａを有する。
電池缶１内には、捲回電極群３および電池蓋組立体１０６が収容され、電池缶１の開口部１ａが電池蓋６によって封止されている。電池蓋６は略矩形の平板状であって、電池缶１の開口部１ａを塞いで溶接され、外部に対し電池缶１を封止している。電池蓋６には、正極外部端子１４と、負極外部端子１２が設けられている。正極外部端子１４、負極外部端子１２は、バスバー（図示せず）を介して外部機器に接続される。正極外部端子１４と負極外部端子１２を介して捲回電極群３に充電され、また外部負荷に電力が供給される。電池蓋６には、ガス排出弁１０が一体的に設けられている。電池容器内の圧力が上昇すると、ガス排出弁１０が開いて内部からガスが排出され、電池容器内の圧力が低減される。これによって、扁平捲回形の二次電池１００の安全性が確保される。電池蓋６には、注液孔９（図２参照）を封止する注液栓１１が設けられている。 -First embodiment-
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an external perspective view of a flat wound secondary battery, and FIG. 2 is an exploded perspective view of the secondary battery shown in FIG.
The secondary battery 100 includes a battery can 1 and a battery lid 6 that form a battery container. The battery can 1 is a rectangular secondary battery having a flat box shape, a pair of opposed wide side surfaces 1b having a relatively large area, and a pair of opposed narrow side surfaces 1c having a relatively small area, It has a bottom 1d and has an opening 1a above it.
In the battery can 1, the wound electrode group 3 and the battery lid assembly 106 are accommodated, and the opening 1 a of the battery can 1 is sealed by the battery lid 6. The battery lid 6 has a substantially rectangular flat plate shape and is welded by closing the opening 1a of the battery can 1 to seal the battery can 1 to the outside. The battery lid 6 is provided with a positive external terminal 14 and a negative external terminal 12. The positive external terminal 14 and the negative external terminal 12 are connected to an external device via a bus bar (not shown). The wound electrode group 3 is charged via the positive external terminal 14 and the negative external terminal 12, and power is supplied to the external load. The battery cover 6 is integrally provided with a gas discharge valve 10. When the pressure in the battery container rises, the gas discharge valve 10 opens to discharge gas from the inside, and the pressure in the battery container is reduced. Thereby, the safety of the flat wound secondary battery 100 is ensured. The battery lid 6 is provided with a liquid injection plug 11 for sealing the liquid injection hole 9 (see FIG. 2).

二次電池１００の電池缶１内には、絶縁保護フィルム２を介して捲回電極群３が収容されている。
捲回電極群３は、負極電極３２と正極電極３４とを、両部材の間にセパレータ３３、３５を介して捲回して形成されている（図３参照）。捲回電極群３は、扁平な平坦部３６と、平坦部３６の捲回方向の両端に形成された断面半円形状の湾曲部３７を有する。捲回電極群３は、捲回軸方向が電池缶１の横幅方向に沿うように、一方の湾曲部３７側から電池缶１内に挿入され、他方の湾曲部３７側が、電池缶１の開口部１ａ側に配置される。 A wound electrode group 3 is accommodated in the battery can 1 of the secondary battery 100 via an insulating protective film 2.
The wound electrode group 3 is formed by winding a negative electrode 32 and a positive electrode 34 through separators 33 and 35 between both members (see FIG. 3). The wound electrode group 3 includes a flat flat portion 36 and curved portions 37 having a semicircular cross section formed at both ends of the flat portion 36 in the winding direction. The wound electrode group 3 is inserted into the battery can 1 from one curved portion 37 side so that the winding axis direction is along the lateral width direction of the battery can 1, and the other curved portion 37 side is the opening of the battery can 1. Arranged on the part 1a side.

詳細は後述するが、正極電極３４は、正極箔露出部３４ｃを有し、負極電極３２は、負極箔露出部３２ｃを有する。
捲回電極群３の正極箔露出部３４ｃは、正極集電板４４を介して電池蓋６に設けられた正極外部端子１４に電気的に接続されている。また、捲回電極群３の負極箔露出部３２ｃは、負極集電板２４を介して電池蓋６に設けられた負極外部端子１２に電気的に接続されている。これにより、正極集電板４４および負極集電板２４を介して捲回電極群３から外部負荷へ電力が供給され、正極集電板４４および負極集電板２４を介して捲回電極群３へ外部発電電力が供給され充電される。 Although details will be described later, the positive electrode 34 has a positive foil exposed portion 34c, and the negative electrode 32 has a negative foil exposed portion 32c.
The positive electrode foil exposed portion 34 c of the wound electrode group 3 is electrically connected to the positive electrode external terminal 14 provided on the battery lid 6 via the positive electrode current collector plate 44. The negative electrode foil exposed portion 32 c of the wound electrode group 3 is electrically connected to the negative electrode external terminal 12 provided on the battery lid 6 via the negative electrode current collector plate 24. As a result, power is supplied from the wound electrode group 3 to the external load via the positive current collector plate 44 and the negative current collector plate 24, and the wound electrode group 3 is provided via the positive current collector plate 44 and the negative current collector plate 24. Externally generated power is supplied to and charged.

図４は、図２に図示された電池蓋組立体外観斜視図であり、図５は、図４に図示された電池蓋組立体の分解斜視図である。図４、図５では負極側の構造を示しているが、負極側と正極側とは同様の構造であり、負極側の各部材の参照番号に相当する正極側の各部材の参照番号をかっこ書きで付している。   4 is an external perspective view of the battery lid assembly shown in FIG. 2, and FIG. 5 is an exploded perspective view of the battery lid assembly shown in FIG. 4 and 5 show the structure of the negative electrode side, the negative electrode side and the positive electrode side have the same structure, and the reference numbers of the positive electrode members corresponding to the reference numbers of the negative electrode members are parenthesized. It is attached in writing.

電池蓋組立体１０６は、電池蓋６と、負・正極外部端子１２、１４と、一対のガスケット５と、一対の絶縁板７と、負・正極集電板２４、４４とを有する。電池蓋６には、負・正極側貫通孔２６、４６が設けられている。負・正極外部端子１２、１４には、それぞれ、下方に向かって突出する負・正極外部端子軸部１２ａ、１４ａが形成されている。負・正極外部端子軸部１２ａ、１４ａは、それぞれ、円柱形状を有している。
各絶縁板７には、貫通孔１７が設けられている。また、負・正極集電板２４、４４には、それぞれ、負・正極側集電板貫通孔２５、４５が設けられている。負・正極側貫通孔２６、４６と、各貫通孔１７と、負・正極側集電板貫通孔２５、４５とは、それぞれ、負・正極外部端子１２、１４の負・正極外部端子軸部１２ａ、１４ａが挿通される大きさに形成されている。 The battery lid assembly 106 includes a battery lid 6, negative / positive electrode external terminals 12, 14, a pair of gaskets 5, a pair of insulating plates 7, and negative / positive electrode current collector plates 24, 44. The battery lid 6 is provided with negative and positive side through holes 26 and 46. The negative / positive electrode external terminals 12 and 14 are respectively formed with negative / positive electrode external terminal shaft portions 12a and 14a protruding downward. Each of the negative / positive electrode external terminal shaft portions 12a and 14a has a cylindrical shape.
Each insulating plate 7 is provided with a through hole 17. Further, the negative / positive electrode current collector plates 24, 44 are provided with negative / positive electrode side current collector plate through holes 25, 45, respectively. The negative / positive electrode side through holes 26, 46, the respective through holes 17, and the negative / positive electrode side current collector plate through holes 25, 45 are the negative / positive electrode external terminal shaft portions of the negative / positive electrode external terminals 12, 14, respectively. It is formed in such a size that 12a and 14a are inserted.

電池蓋６の一面側にガスケット５が取付けられ、正極外部端子１４および負極外部端子１２が、それぞれ、電池蓋６と絶縁される。また、電池蓋６の他面側に絶縁板７が取付けられ、正極集電板４４および負極集電板２４は、それぞれ、電池蓋６と絶縁される。   The gasket 5 is attached to one surface side of the battery cover 6, and the positive external terminal 14 and the negative external terminal 12 are insulated from the battery cover 6, respectively. Further, the insulating plate 7 is attached to the other surface side of the battery lid 6, and the positive current collector plate 44 and the negative current collector plate 24 are insulated from the battery lid 6, respectively.

電池蓋組立体１０６の組立は、下記の手順による。
電池蓋６の外面側（図２、図５では上方側）に各ガスケット５を配置する。ガスケット５は、負・正極外部端子１２、１４を収容する収容部５ａと、電池蓋６の負・正極側貫通孔２６、４６内に嵌入する貫通孔嵌入部５ｂとを有する（図６も参照）。貫通孔嵌入部５ｂを電池蓋６の負・正極側貫通孔２６、４６内に嵌入する。電池蓋６の内面側（図２、図５では下方側）に各々絶縁板を配置し、各絶縁板７の下方に、それぞれ、負・正極集電板２４、４４を配置する。各絶縁板７と負・正極集電板２４、４４とは、各絶縁板７の貫通孔１７の軸心と、負・正極集電板２４、４４の負・正極側集電板貫通孔２５、４５の軸心とを、それぞれ、電池蓋６の負・正極側貫通孔２６、４６の軸心に一致するように位置決めする。この状態で、負極外部端子１２の負極外部端子軸部１２ａを、ガスケット５の貫通孔５ｃ、絶縁板７の貫通孔１７および負極集電板２４の負極側集電板貫通孔２５に貫通して、後述する方法により負極外部端子１２を電池蓋６に固定する。また、正極外部端子１４の正極外部端子軸部１４ａを、ガスケット５、絶縁板７の貫通孔１７および正極集電板４４の正極側集電板貫通孔４５に貫通して、後述する方法により正極外部端子１４を電池蓋６に固定する。負極外部端子１２と正極外部端子１４の電池蓋６への固定は、どちらを先に行っても差し支えない。 The battery lid assembly 106 is assembled according to the following procedure.
Each gasket 5 is arranged on the outer surface side (the upper side in FIGS. 2 and 5) of the battery lid 6. The gasket 5 includes an accommodating portion 5a for accommodating the negative / positive electrode external terminals 12 and 14 and a through hole fitting portion 5b that fits into the negative / positive electrode side through holes 26 and 46 of the battery lid 6 (see also FIG. 6). ). The through hole insertion portion 5 b is inserted into the negative and positive side through holes 26 and 46 of the battery lid 6. Insulating plates are respectively arranged on the inner surface side (lower side in FIGS. 2 and 5) of the battery lid 6, and negative / positive electrode current collecting plates 24 and 44 are respectively arranged below the insulating plates 7. The insulating plates 7 and the negative / positive electrode current collecting plates 24, 44 include the axis of the through hole 17 of each insulating plate 7 and the negative / positive electrode current collecting plate through holes 25 of the negative / positive electrode current collecting plates 24, 44. , 45 are positioned so as to coincide with the axial centers of the negative and positive side through holes 26, 46 of the battery lid 6. In this state, the negative electrode external terminal shaft portion 12 a of the negative electrode external terminal 12 passes through the through hole 5 c of the gasket 5, the through hole 17 of the insulating plate 7, and the negative electrode side current collector plate through hole 25 of the negative electrode current collector plate 24. The negative electrode external terminal 12 is fixed to the battery lid 6 by a method described later. Further, the positive external terminal shaft portion 14a of the positive external terminal 14 is passed through the gasket 5, the through hole 17 of the insulating plate 7, and the positive current collector plate through hole 45 of the positive current collector plate 44, and the positive electrode is formed by a method described later. The external terminal 14 is fixed to the battery lid 6. The negative electrode external terminal 12 and the positive electrode external terminal 14 may be fixed to the battery cover 6 either way first.

正極外部端子１４および正極集電板４４の形成素材としては、例えばアルミニウム合金が挙げられ、負極外部端子１２および負極集電板２４の形成素材としては、例えば、銅合金が挙げられる。また、絶縁板７およびガスケット５の形成素材としては、例えばポリブチレンテレフタレートやポリフェニレンサルファイド、ペルフルオロアルコキシフッ素樹脂等の絶縁性を有する樹脂材が挙げられる。   Examples of the material for forming the positive electrode external terminal 14 and the positive electrode current collector plate 44 include aluminum alloys, and examples of the material for forming the negative electrode external terminal 12 and the negative electrode current collector plate 24 include copper alloys. Examples of the material for forming the insulating plate 7 and the gasket 5 include resin materials having insulating properties such as polybutylene terephthalate, polyphenylene sulfide, and perfluoroalkoxy fluororesin.

電池容器内に注入される電解液としては、例えば、エチレンカーボネート等の炭酸エステル系の有機溶媒に６フッ化リン酸リチウム（ＬｉＰＦ6）等のリチウム塩が溶解された非水電解液を適用することができる。電池容器内外の圧力を適切に調整すると、捲回電極群３内の空気と電解液の置換が促進されて、電池容器内に電解液を効率的に注入することができる。 As the electrolytic solution injected into the battery container, for example, a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonic acid ester-based organic solvent such as ethylene carbonate is applied. be able to. When the pressure inside and outside the battery container is appropriately adjusted, the replacement of the air in the wound electrode group 3 with the electrolytic solution is promoted, and the electrolytic solution can be efficiently injected into the battery container.

正極集電板４４は、正極集電板基部４１と、正極側接続部４２とを有している。正極側接続端部は、正極集電板基部４１の側端で折曲されて、電池缶１の幅広側面１ｂに沿って底面１ｄ側に向かって延出される。正極集電板４４の正極側接続部４２は、捲回電極群３の正極箔露出部３４ｃに対向して重ね合わされた状態で接続される。正極集電板基部４１には、上述したように、正極外部端子軸部１４ａが挿通される正極側集電板貫通孔４５が形成されている。
負極集電板２４は、負極集電板基部２１と、負極側接続部２２とを有している。負極側接続部２２は、負極集電板基部２１の側端で折曲されて、電池缶１の幅広側面１ｂに沿って底面１ｄ側に向かって延出される。負極集電板２４の負極側接続部２２は、捲回電極群３の負極箔露出部３２ｃに対向して重ね合わされた状態で接続される。負極集電板基部２１には、上述したように、負極外部端子軸部１２ａが挿通される負極側集電板貫通孔２５が形成されている。 The positive electrode current collector plate 44 includes a positive electrode current collector plate base 41 and a positive electrode side connection portion 42. The positive electrode side connection end portion is bent at the side end of the positive electrode current collector plate base portion 41, and extends toward the bottom surface 1 d side along the wide side surface 1 b of the battery can 1. The positive electrode side connection part 42 of the positive electrode current collector plate 44 is connected in a state of being superimposed on the positive electrode foil exposed part 34 c of the wound electrode group 3. As described above, the positive current collector plate base 41 is formed with the positive current collector plate through hole 45 through which the positive external terminal shaft portion 14a is inserted.
The negative electrode current collector plate 24 has a negative electrode current collector plate base portion 21 and a negative electrode side connection portion 22. The negative electrode side connection portion 22 is bent at the side end of the negative electrode current collector plate base portion 21, and extends toward the bottom surface 1 d side along the wide side surface 1 b of the battery can 1. The negative electrode side connection portion 22 of the negative electrode current collector plate 24 is connected in a state of being overlapped with the negative electrode foil exposed portion 32 c of the wound electrode group 3. As described above, the negative electrode current collector plate base 21 is formed with the negative electrode current collector plate through-hole 25 through which the negative electrode external terminal shaft 12a is inserted.

正極箔露出部３４ｃと正極集電板４４、および負極箔露出部３２ｃと負極集電板２４は、それぞれ、例えば、超音波溶接により接合される。超音波溶接は、正・負極集電板４４、２４をアンビルで固定した状態で、正・負極箔露出部３４ｃ、３２ｃにホーンを押し当てて、超音波振動により金属界面を接合する手法である。
なお、集電部の接合方法としては、抵抗溶接等の他の方法を適用しても良い。 The positive electrode foil exposed portion 34c and the positive electrode current collector plate 44, and the negative electrode foil exposed portion 32c and the negative electrode current collector plate 24 are joined by, for example, ultrasonic welding. Ultrasonic welding is a method in which a horn is pressed against the positive / negative electrode foil exposed portions 34c and 32c and the metal interface is bonded by ultrasonic vibration in a state where the positive / negative electrode current collector plates 44 and 24 are fixed with an anvil. .
In addition, as a joining method of a current collection part, you may apply other methods, such as resistance welding.

絶縁保護フィルム２は、捲回電極群３の平坦部３６に沿う方向でかつ捲回電極群３の捲回軸方向に直交する方向を巻き付け中心として、捲回電極群３の周囲に巻き付けられている。絶縁保護フィルム２は、例えばＰＰ（ポリプロピレン）などの合成樹脂製の一枚のシートまたは複数のフィルム部材からなり、捲回電極群３の平坦部３６と平行な方向でかつ捲回軸方向に直交する方向を巻き付け中心として少なくとも１周以上巻き付けることができる長さを有している。   The insulating protective film 2 is wound around the wound electrode group 3 with the winding center in the direction along the flat portion 36 of the wound electrode group 3 and perpendicular to the winding axis direction of the wound electrode group 3. Yes. The insulating protective film 2 is made of, for example, a single sheet made of synthetic resin such as PP (polypropylene) or a plurality of film members, and is parallel to the flat portion 36 of the wound electrode group 3 and orthogonal to the winding axis direction. It has a length that can be wound at least one round around the winding direction.

図３は、図２に図示された捲回電極群の分解斜視図である。図３は、捲回電極群３の外周側を展開した状態で示している。
捲回電極群３は、負極電極３２と正極電極３４とを間にセパレータ３３、３５を介して扁平状に捲回することによって構成されている。セパレータ３５は、負極電極３２の一面と正極電極３４の他面との間に介在している。セパレータ３３は、正極電極３４の一面と負極電極３２の他面との間に介在している。負極電極３２の最外周部およびセパレータ３３の最外周部が、捲回電極群３の最外周になるように捲回されている。従って、捲回電極群３は、外周側から順に、セパレータ３３、負極電極３２、セパレータ３５、正極電極３４、セパレータ３３、負極電極３２、セパレータ３５、正極電極３４……を繰り返して捲回されている。セパレータ３３、３５は、正極電極３４と負極電極３２との間を絶縁する役割を有している。 FIG. 3 is an exploded perspective view of the wound electrode group illustrated in FIG. 2. FIG. 3 shows a state in which the outer peripheral side of the wound electrode group 3 is developed.
The wound electrode group 3 is configured by winding a negative electrode 32 and a positive electrode 34 in a flat shape with separators 33 and 35 interposed therebetween. The separator 35 is interposed between one surface of the negative electrode 32 and the other surface of the positive electrode 34. The separator 33 is interposed between one surface of the positive electrode 34 and the other surface of the negative electrode 32. The outermost periphery of the negative electrode 32 and the outermost periphery of the separator 33 are wound so as to be the outermost periphery of the wound electrode group 3. Therefore, the wound electrode group 3 is wound in order from the outer peripheral side by repeating the separator 33, the negative electrode 32, the separator 35, the positive electrode 34, the separator 33, the negative electrode 32, the separator 35, the positive electrode 34,. Yes. The separators 33 and 35 have a role of insulating between the positive electrode 34 and the negative electrode 32.

負極電極３２の負極合剤層３２ｂは、正極電極３４の正極合剤層３４ｂよりも幅方向に大きく、正極合剤層３４ｂは、必ず負極合剤層３２ｂの間に挟まれるように構成されている。すなわち、負極電極３２は、正極合剤層３４ｂよりも幅広の負極合剤層３２ｂを有しており、負極合剤層３２ｂの捲回軸方向に直交する方向（幅方向）の両側の端部が正極合剤層３４ｂの捲回軸方向に直交する方向（幅方向）の両側の端部よりもそれぞれ突出した状態で、正極電極３４と重ね合わされて捲回される。正極箔露出部３４ｃ、負極箔露出部３２ｃは、相互に、幅方向の反対側に配置されている。   The negative electrode mixture layer 32b of the negative electrode 32 is larger in the width direction than the positive electrode mixture layer 34b of the positive electrode 34, and the positive electrode mixture layer 34b is always sandwiched between the negative electrode mixture layers 32b. Yes. That is, the negative electrode 32 has a negative electrode mixture layer 32b wider than the positive electrode mixture layer 34b, and ends on both sides in a direction (width direction) orthogonal to the winding axis direction of the negative electrode mixture layer 32b. Are wound on the positive electrode 34 in a state of projecting from the end portions on both sides in the direction (width direction) orthogonal to the winding axis direction of the positive electrode mixture layer 34b. The positive foil exposed portion 34c and the negative foil exposed portion 32c are disposed on the opposite sides in the width direction.

正極箔露出部３４ｃ、負極箔露出部３２ｃは、平面部分で厚さ方向に束ねられて溶接等により正極集電板４４、負極集電板２４に接続される。なお、セパレータ３３、３５は幅方向で負極合剤層３２ｂよりも広いが、正極箔露出部３４ｃ、負極箔露出部３２ｃで端部の金属箔面が露出する位置に捲回されるため、束ねて溶接する場合の支障にはならない。
必要に応じて、捲回電極群３の最内周に軸芯を配置することも可能である。軸芯としては例えば、正極金属箔、負極金属箔、セパレータ３３、３５のいずれよりも曲げ剛性の高い樹脂シートを捲回して構成したものを用いることができる。 The positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c are bundled in the thickness direction at the plane portion and connected to the positive electrode current collector plate 44 and the negative electrode current collector plate 24 by welding or the like. Although the separators 33 and 35 are wider than the negative electrode mixture layer 32b in the width direction, the separators 33 and 35 are wound at positions where the metal foil surface at the end is exposed at the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c. This will not interfere with welding.
If necessary, it is also possible to arrange an axial center on the innermost circumference of the wound electrode group 3. As the shaft core, for example, a material obtained by winding a resin sheet having higher bending rigidity than any of the positive electrode metal foil, the negative electrode metal foil, and the separators 33 and 35 can be used.

セパレータ３３、３５は、軟質な帯状のシート部材からなり、基材となる多孔質のポリオレフィン樹脂層の一方の面に、無機材料とバインダからなる耐熱層が積層されて設けられている。セパレータ３３、３５は、耐熱層が正極電極３４に対向する向きに配置される。なお、二次電池の仕様によっては、この限りではなく、耐熱層を有していない樹脂層のみのセパレータを適用してもよい。   The separators 33 and 35 are made of a soft belt-like sheet member, and a heat-resistant layer made of an inorganic material and a binder is laminated on one surface of a porous polyolefin resin layer serving as a base material. The separators 33 and 35 are arranged in a direction in which the heat-resistant layer faces the positive electrode 34. Depending on the specifications of the secondary battery, the separator is not limited to this, and a separator having only a resin layer that does not have a heat-resistant layer may be applied.

負極電極３２は、負極集電体である負極金属箔３２ａの両面に負極活物質を含む負極合剤を塗布して形成された負極合剤層３２ｂが設けられている。そして、負極金属箔３２ａの幅方向一方側の端部には、負極合剤が塗布されていない未塗工部である負極箔露出部３２ｃが設けられている。すなわち、負極電極３２は、負極金属箔３２ａに塗工された負極合剤層３２ｂと、負極金属箔３２ａが露出する負極箔露出部３２ｃとを有している。負極箔露出部３２ｃは、負極合剤層３２ｂから負極金属箔３２ａが突出した領域であり、捲回電極群３の捲回軸方向に直交する方向（幅方向）の他方側の位置に配置される。   The negative electrode 32 is provided with a negative electrode mixture layer 32b formed by applying a negative electrode mixture containing a negative electrode active material on both surfaces of a negative electrode metal foil 32a which is a negative electrode current collector. And the negative electrode foil exposure part 32c which is the uncoated part in which the negative mix is not apply | coated is provided in the edge part of the width direction one side of the negative electrode metal foil 32a. That is, the negative electrode 32 has a negative electrode mixture layer 32b applied to the negative electrode metal foil 32a and a negative electrode foil exposed portion 32c where the negative electrode metal foil 32a is exposed. The negative electrode foil exposed portion 32c is a region where the negative electrode metal foil 32a protrudes from the negative electrode mixture layer 32b, and is disposed at the other side position in the direction (width direction) orthogonal to the winding axis direction of the wound electrode group 3. The

負極電極３２に関しては、負極活物質として天然黒鉛粉末１００重量部に対して、結着剤として１０重量部のスチレンブタジエンゴム（以下、ＳＢＲという。）を添加し、これに分散溶媒としてＨ2Ｏの溶媒に、増粘剤としてカルボキシメチルセルロース（ＣＭＣ）を添加、混練した負極合剤を作製した。この負極合剤を銅箔（負極金属箔３２ａ）の両面に溶接部である負極箔露出部３２ｃ（負極未塗工部）を残して塗布した。その後、乾燥、プレス、裁断工程を経て、負極電極３２を得た。 Regarding the negative electrode 32, 10 parts by weight of styrene butadiene rubber (hereinafter referred to as SBR) is added as a binder to 100 parts by weight of natural graphite powder as a negative electrode active material, and H 2 O as a dispersion solvent is added thereto. In this solvent, carboxymethyl cellulose (CMC) was added as a thickener and kneaded to prepare a negative electrode mixture. This negative electrode mixture was applied to both surfaces of a copper foil (negative electrode metal foil 32a) leaving a negative electrode foil exposed portion 32c (negative electrode uncoated portion) as a welded portion. Then, the negative electrode 32 was obtained through the drying, the press, and the cutting process.

上記では、負極活物質に天然黒鉛を用いる場合について例示したが、これに限定されるものではなく、リチウムイオンを挿入、脱離可能な非晶質炭素や、人造の各種黒鉛材、コークスなどの炭素質材料やＳｉやＳｎなどの化合物（例えば、ＳｉＯ、ＴｉＳｉ2等）、またはそれの複合材料でもよく、その粒子形状においても、鱗片状、球状、繊維状、塊状等、特に制限されるものではない。 In the above, the case where natural graphite is used as the negative electrode active material is exemplified, but the present invention is not limited to this, and amorphous carbon capable of inserting and releasing lithium ions, various artificial graphite materials, coke, etc. It may be a carbonaceous material, a compound such as Si or Sn (for example, SiO, TiSi 2, etc.), or a composite material thereof, and the particle shape is also particularly limited, such as scaly, spherical, fibrous, or massive is not.

また、負極電極３２における塗工部の結着剤としてＳＢＲを用いる場合について例示したが、ポリフッ化ビニリデン（ＰＶＤＦ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエチレン、ポリスチレン、ポリブタジエン、ブチルゴム、ニトリルゴム、多硫化ゴム、ニトロセルロース、シアノエチルセルロース、各種ラテックス、アクリロニトリル、フッ化ビニル、フッ化ビニリデン、フッ化プロピレン、フッ化クロロプレン、アクリル系樹脂などの重合体およびこれらの混合体などを用いることができる。   Moreover, although illustrated about the case where SBR is used as the binder of the coating part in the negative electrode 32, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, many Polymers such as sulfurized rubber, nitrocellulose, cyanoethylcellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, and acrylic resins, and mixtures thereof can be used.

また、負極電極３２における塗工部の分散溶媒としてＨ2Ｏの溶媒に、増粘剤としてＣＭＣを添加した場合について例示したが、これに限られたものではなく、例えばＨ2Ｏの溶媒に、分散溶媒としてＮ−メチルピロリドン（ＮＭＰ）を添加したものを用いてもよい。 Further, the solvent of H 2 O as a dispersion solvent for the coated portion of the negative electrode 32 has been illustrated for the case of adding CMC as a thickener, not limited thereto, in a solvent e.g. H 2 O A dispersion solvent to which N-methylpyrrolidone (NMP) is added may be used.

正極電極３４は、正極集電体である正極金属箔３４ａの両面に正極活物質を含む正極合剤を塗布して形成された正極合剤層３４ｂが設けられている。そして、正極金属箔３４ａの幅方向一方側の端部には、正極合剤が塗布されていない未塗工部である正極箔露出部３４ｃが設けられている。すなわち、正極電極３４は、正極金属箔３４ａに塗工された正極合剤層３４ｂと、正極金属箔３４ａが露出する正極箔露出部３４ｃとを有している。正極箔露出部３４ｃは、正極合剤層３４ｂから正極金属箔３４ａが突出した領域であり、捲回電極群３の捲回軸方向に直交する方向（幅方向）の一方側の位置に配置される。   The positive electrode 34 is provided with a positive electrode mixture layer 34b formed by applying a positive electrode mixture containing a positive electrode active material on both surfaces of a positive electrode metal foil 34a that is a positive electrode current collector. And the positive electrode foil exposure part 34c which is the uncoated part in which the positive mix is not apply | coated is provided in the edge part of the width direction one side of the positive electrode metal foil 34a. That is, the positive electrode 34 has a positive electrode mixture layer 34b applied to the positive metal foil 34a and a positive electrode foil exposed portion 34c from which the positive metal foil 34a is exposed. The positive foil exposed portion 34c is a region in which the positive metal foil 34a protrudes from the positive electrode mixture layer 34b, and is disposed at one position in the direction (width direction) orthogonal to the winding axis direction of the wound electrode group 3. The

正極電極３４に関しては、正極活物質としてマンガン酸リチウム（化学式ＬｉＭｎ2Ｏ4）１００重量部に対し、導電材として１０重量部の鱗片状黒鉛と、結着剤として１０重量部のＰＶＤＦとを添加し、これに分散溶媒としてＮＭＰを添加、混練してスラリ状の正極合剤を作製した。このスラリ状の正極合剤をアルミニウム箔（正極金属箔）の両面に溶接部である正極箔露出部３４ｃ（正極未塗工部）を残して塗布した。その後、乾燥、プレス、裁断工程を経て正極電極３４を得た。 As for the positive electrode 34, 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of PVDF as a binder are added to 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material. Then, NMP was added as a dispersion solvent and kneaded to prepare a slurry-like positive electrode mixture. This slurry-like positive electrode mixture was applied to both surfaces of an aluminum foil (positive metal foil) leaving a positive foil exposed portion 34c (positive electrode uncoated portion) as a welded portion. Then, the positive electrode 34 was obtained through the drying, the press, and the cutting process.

本実施形態では、正極活物質にマンガン酸リチウムを用いる場合について例示したが、スピネル結晶構造を有する他のマンガン酸リチウムや一部を金属元素で置換又はドープしたリチウムマンガン複合酸化物や層状結晶構造を有すコバルト酸リチウムやチタン酸リチウムやこれらの一部を金属元素で置換またはドープしたリチウム-金属複合酸化物を用いるようにしてもよい。   In the present embodiment, the case where lithium manganate is used as the positive electrode active material is exemplified. However, another lithium manganate having a spinel crystal structure or a lithium manganese composite oxide or layered crystal structure in which a part is substituted or doped with a metal element Lithium cobaltate, lithium titanate, or a lithium-metal composite oxide in which a part thereof is substituted or doped with a metal element may be used.

また、本実施形態では、正極合剤における結着剤としてＰＶＤＦを用いる場合について例示したが、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエチレン、ポリスチレン、ポリブタジエン、ブチルゴム、ニトリルゴム、スチレンブタジエンゴム、多硫化ゴム、ニトロセルロース、シアノエチルセルロース、各種ラテックス、アクリロニトリル、フッ化ビニル、フッ化ビニリデン、フッ化プロピレン、フッ化クロロプレン、アクリル系樹脂などの重合体およびこれらの混体などを用いることができる。   Moreover, in this embodiment, although the case where PVDF was used as a binder in a positive electrode mixture was illustrated, polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene butadiene rubber, polysulfide rubber Polymers such as nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, and acrylic resins, and mixtures thereof can be used.

図６〜図８を参照して、電池組立体の電池蓋に外部端子を固定する方法を説明する。
図６は、外部端子を集電板にかしめた状態を示す断面図であり、図７は、図６に続く工程を説明するための断面図であり、図８は、図７に続く工程を説明するための断面図である。
上述した通り、電池蓋組立体１０６を構成するには、ガスケット５の貫通孔嵌入部５ｂを電池蓋６の負・正極側貫通孔２６、４６内に嵌入する。そして、電池蓋６の外面側に負・正極外部端子１２、１４を配置し、電池蓋６の内面側に絶縁板７と負・正極集電板２４、４４の負・正極集電板基部２１、４１を配置する。そして、負・正極外部端子１２、１４の負・正極外部端子軸部１２ａ、１４ａを、それぞれ、ガスケット５の貫通孔５ｃ、絶縁板７の貫通孔５ｃ、絶縁板７の貫通孔１７および負・正極集電板２４、４４の負・正極集電板基部２１、４１に形成された負・正極側集電板貫通孔２５、４５を挿通する。 With reference to FIGS. 6-8, the method to fix an external terminal to the battery cover of a battery assembly is demonstrated.
6 is a cross-sectional view showing a state in which the external terminal is caulked to the current collector plate, FIG. 7 is a cross-sectional view for explaining a process following FIG. 6, and FIG. 8 is a process following FIG. It is sectional drawing for demonstrating.
As described above, in order to configure the battery lid assembly 106, the through hole fitting portion 5 b of the gasket 5 is fitted into the negative / positive electrode side through holes 26 and 46 of the battery lid 6. Then, negative / positive electrode external terminals 12 and 14 are arranged on the outer surface side of the battery lid 6, and the negative / positive electrode current collector plate base 21 of the insulating plate 7 and the negative / positive electrode current collector plates 24 and 44 on the inner surface side of the battery lid 6. , 41 are arranged. The negative / positive electrode external terminal shaft portions 12a, 14a of the negative / positive electrode external terminals 12, 14 are respectively connected to the through hole 5c of the gasket 5, the through hole 5c of the insulating plate 7, the through hole 17 of the insulating plate 7, and the negative / positive electrode terminals 12a, 14a. The negative / positive electrode side current collector plate through holes 25 and 45 formed in the negative / positive electrode current collector plate bases 21 and 41 of the positive electrode current collector plates 24 and 44 are inserted.

負・正極外部端子１２、１４は、それぞれ、上部に負・正極外部端子出力部１２ｃ、１４ｃを有している。負・正極外部端子軸部１２ａ、１４ａは、負・正極外部端子出力部１２ｃ、１４ｃの幅より小さい軸部材である。図６は、負・正極外部端子軸部１２ａ、１４ａはかしめられた状態の図であるが、かしめる前は、負・正極外部端子軸部１２ａ、１４ａは負・正極外部端子出力部１２ｃ、１４ｃから、軸方向に直線状に延在されている。負・正極外部端子軸部１２ａ、１４ａの下端部には、底面１２ｂ、１４ｂを有する凹部１２ｅ、１４ｅが形成されている。   The negative / positive electrode external terminals 12 and 14 have negative / positive electrode external terminal output portions 12c and 14c, respectively, in the upper part. The negative / positive electrode external terminal shaft portions 12a, 14a are shaft members smaller than the width of the negative / positive electrode external terminal output portions 12c, 14c. FIG. 6 is a diagram of the state in which the negative / positive electrode external terminal shaft portions 12a, 14a are caulked, but before caulking, the negative / positive electrode external terminal shaft portions 12a, 14a are negative / positive electrode external terminal output portions 12c, 14c extends linearly in the axial direction. Concave portions 12e and 14e having bottom surfaces 12b and 14b are formed at the lower ends of the negative and positive external terminal shaft portions 12a and 14a.

負・正極外部端子１２、１４を負・正極集電板２４、４４にかしめ・接合により固定する。負極外部端子１２を負極集電板２４に固定する方法と正極外部端子１４を正極集電板４４に固定する方法は、同様である。従って、以下においては、負極外部端子１２を負極集電板２４に固定する方法を説明することとする。
負極外部端子１２の負極外部端子軸部１２ａを、ガスケット５の貫通孔５ｃ、絶縁板７の貫通孔１７および負極集電板基部２１に形成された負極側集電板貫通孔２５を挿通する。そして、負極外部端子１２の負極外部端子出力部１２ｃの下面を、ガスケット５の収容部５ａの底部５ｄに当接させる。この状態で、負極外部端子軸部１２ａの下端部は、負極集電板基部２１の下面２１ａの下方に突出する。このとき、負極外部端子軸部１２ａの下端部に設けられた凹部１２ｅの底面１２ｂは、負極集電板基部２１の、負極外部端子出力部１２ｃとは反対側の面である下面２１ａと、ほぼ同一の高さに位置している。 The negative / positive electrode external terminals 12 and 14 are fixed to the negative / positive electrode current collector plates 24 and 44 by caulking and joining. The method of fixing the negative electrode external terminal 12 to the negative electrode current collector plate 24 and the method of fixing the positive electrode external terminal 14 to the positive electrode current collector plate 44 are the same. Therefore, in the following, a method for fixing the negative electrode external terminal 12 to the negative electrode current collector plate 24 will be described.
The negative electrode external terminal shaft portion 12 a of the negative electrode external terminal 12 is inserted through the through hole 5 c of the gasket 5, the through hole 17 of the insulating plate 7, and the negative electrode current collector plate through hole 25 formed in the negative electrode current collector plate base 21. Then, the lower surface of the negative electrode external terminal output portion 12 c of the negative electrode external terminal 12 is brought into contact with the bottom portion 5 d of the accommodating portion 5 a of the gasket 5. In this state, the lower end portion of the negative electrode external terminal shaft portion 12 a protrudes below the lower surface 21 a of the negative electrode current collector plate base portion 21. At this time, the bottom surface 12b of the recess 12e provided at the lower end portion of the negative electrode external terminal shaft portion 12a is substantially the same as the lower surface 21a of the negative electrode current collector plate base 21 opposite to the negative electrode external terminal output portion 12c. Located at the same height.

この状態で、負極外部端子軸部１２ａと負極集電板基部２１とをかしめる。
かしめはかしめ機のヘッドにより、負極外部端子１２の負極外部端子軸部１２ａを押圧することにより行われる。かしめ機のヘッドにより、負極外部端子軸部１２ａの負極集電板基部２１の下面２１ａより突出する部分を外側に押し広げることにより負極外部端子軸部１２ａと負極集電板基部２１がかしめられる。図６は負極外部端子軸部１２ａと負極集電板基部２１とが負極外部端子軸部１２ａのかしめ部１２ｄでかしめられた状態を示している。かしめ機は、ヘッドが負極外部端子軸部１２ａの凹部１２ｅの底面１２ｂの位置まで下降可能なように設定する。それにより、負極外部端子軸部１２ａの負極集電板基部２１の下面２１ａより突出する部分を外側に十分に押し広げることができる。 In this state, the negative electrode external terminal shaft portion 12a and the negative electrode current collector plate base portion 21 are caulked.
Caulking is performed by pressing the negative electrode external terminal shaft portion 12a of the negative electrode external terminal 12 by the head of the caulking machine. The negative electrode external terminal shaft portion 12a and the negative electrode current collector plate base portion 21 are caulked by the head of the caulking machine by spreading a portion protruding from the lower surface 21a of the negative electrode current collector plate base portion 21 of the negative electrode external terminal shaft portion 12a outward. FIG. 6 shows a state in which the negative electrode external terminal shaft portion 12a and the negative electrode current collector plate base portion 21 are caulked by the caulking portion 12d of the negative electrode external terminal shaft portion 12a. The caulking machine is set so that the head can be lowered to the position of the bottom surface 12b of the recess 12e of the negative electrode external terminal shaft 12a. Thereby, the part which protrudes from the lower surface 21a of the negative electrode current collector plate base part 21 of the negative electrode external terminal shaft part 12a can be sufficiently expanded outward.

外側に押し広げられた負極外部端子１２の負極外部端子軸部１２ａは、負極集電板２４に設けられた負極側集電板貫通孔２５に接触する。さらに、負極外部端子軸部１２ａは、負極外部端子軸部１２ａが負極集電板２４に設けられた負極側集電板貫通孔２５との接触部２８を起点として、さらに外側に押し広げられる。これにより、負極外部端子１２の負極外部端子軸部１２ａと負極集電板２４に設けられた負極集電板基部２１とがかしめられる。   The negative electrode external terminal shaft portion 12 a of the negative electrode external terminal 12 pushed outward is in contact with the negative electrode side current collector plate through-hole 25 provided in the negative electrode current collector plate 24. Further, the negative electrode external terminal shaft portion 12 a is further spread outwardly from the contact portion 28 of the negative electrode external terminal shaft portion 12 a with the negative electrode side current collector plate through hole 25 provided in the negative electrode current collector plate 24. Thereby, the negative electrode external terminal shaft portion 12 a of the negative electrode external terminal 12 and the negative electrode current collector plate base portion 21 provided on the negative electrode current collector plate 24 are caulked.

負極外部端子軸部１２ａと負極集電板基部２１とがかしめられることにより、負極外部端子出力部１２ｃの底面と負極側集電板貫通孔２５の周縁部の接触部２８との間に、負極集電板基部２１と、絶縁板７と、電池蓋６と、ガスケット５とが挟持される。この際、樹脂からなるガスケット５の収容部５ａの底部５ｄが圧迫され、電池蓋６に設けられた負極側貫通孔２６を封止する。また、負極外部端子１２は、電池蓋６の上面と負極外部端子出力部１２ｃとの間に介在されたガスケット５の収容部５ａの底部５ｄにより絶縁され、かつ、電池蓋６の負極側貫通孔２６の周縁部と負極外部端子軸部１２ａとの間に介在されたガスケット５の貫通孔嵌入部５ｂにより絶縁される。これにより、負極外部端子１２は、電池蓋６から絶縁された状態で、電池蓋６に固定される。   The negative electrode external terminal shaft portion 12a and the negative electrode current collector plate base portion 21 are caulked so that the negative electrode external terminal shaft portion 12a and the negative electrode side current collector plate through hole 25 have a negative electrode between the bottom surface and the contact portion 28 at the peripheral edge of the negative electrode current collector plate through hole 25 The current collector plate base 21, the insulating plate 7, the battery lid 6, and the gasket 5 are sandwiched. At this time, the bottom portion 5 d of the housing portion 5 a of the gasket 5 made of resin is pressed to seal the negative electrode side through hole 26 provided in the battery lid 6. The negative electrode external terminal 12 is insulated by the bottom 5d of the accommodating portion 5a of the gasket 5 interposed between the upper surface of the battery lid 6 and the negative electrode external terminal output portion 12c, and the negative electrode side through-hole of the battery lid 6 Insulated by the through-hole fitting portion 5b of the gasket 5 interposed between the peripheral edge portion 26 and the negative electrode external terminal shaft portion 12a. Thereby, the negative electrode external terminal 12 is fixed to the battery cover 6 while being insulated from the battery cover 6.

次に、図７に図示されるように、負極外部端子軸部１２ａと負極側集電板貫通孔２５との接触部２８を接合して、この接触部２８に接合部２９を形成する。上述したように、負極外部端子軸部１２ａは、負極集電板２４の負極側集電板貫通孔２５との接触部２８を起点として、さらに外側に押し広げられる。このため、負極外部端子軸部１２ａと負極集電板２４の負極側集電板貫通孔２５との接触部２８には、空間が形成されていない。この空間が形成されていない接触部２８を接合部２９とするため、負極外部端子軸部１２ａと負極集電板２４との接触抵抗が低減され、かつ、接合強度が大きい安定した高品質の接合が得られる。なお、負極外部端子軸部１２ａと負極側集電板貫通孔２５との接合としては、例えば、レーザ溶接等の溶接を用いることができる。   Next, as illustrated in FIG. 7, a contact portion 28 between the negative electrode external terminal shaft portion 12 a and the negative electrode side current collector plate through hole 25 is bonded, and a bonding portion 29 is formed in the contact portion 28. As described above, the negative electrode external terminal shaft portion 12a is further expanded outward from the contact portion 28 of the negative electrode current collector plate 24 with the negative electrode side current collector plate through hole 25 as a starting point. For this reason, no space is formed in the contact portion 28 between the negative electrode external terminal shaft portion 12 a and the negative electrode current collector plate through hole 25 of the negative electrode collector plate 24. Since the contact portion 28 in which this space is not formed is used as the joint portion 29, the contact resistance between the negative electrode external terminal shaft portion 12a and the negative electrode current collector plate 24 is reduced, and stable high-quality joint with high joint strength is achieved. Is obtained. In addition, welding, such as laser welding, can be used as joining of the negative electrode external terminal shaft portion 12a and the negative electrode side current collector plate through hole 25, for example.

この後、負極外部端子軸部１２ａのかしめ部１２ｄを、さらに、外側に押し広げる、再かしめを行う。つまり、負極外部端子軸部１２ａと負極側集電板貫通孔２５との接触部２８に接合部２９を形成した後、再度、かしめ機のヘッドにより、負極外部端子軸部１２ａのかしめ部１２ｄの軸方向端面を押圧して、負極外部端子軸部１２ａのかしめ部１２ｄを、さらに、外側に押し広げる。これにより、接合部２９における負極外部端子軸部１２ａとの負極外部端子軸部１２ａとの接触面積が増大し、負極外部端子軸部１２ａと負極集電板２４との接触抵抗が、さらに、低減される。   Thereafter, re-caulking is performed by further pushing the caulking portion 12d of the negative electrode external terminal shaft portion 12a outward. That is, after forming the joint portion 29 at the contact portion 28 between the negative electrode external terminal shaft portion 12a and the negative electrode side current collector plate through hole 25, the caulking machine head again forms the crimp portion 12d of the negative electrode external terminal shaft portion 12a. The end face in the axial direction is pressed to further spread the caulking portion 12d of the negative electrode external terminal shaft portion 12a outward. Thereby, the contact area between the negative electrode external terminal shaft portion 12a and the negative electrode external terminal shaft portion 12a in the joint portion 29 is increased, and the contact resistance between the negative electrode external terminal shaft portion 12a and the negative electrode current collector plate 24 is further reduced. Is done.

図８は、負極外部端子軸部１２ａのかしめ部１２ｄに再かしめを行った後の状態を示す。
図８に図示されるように、再かしめを行った後でも、負極外部端子軸部１２ａのかしめ部１２ｄの外周面３１は、軸方向に対して傾斜しており、軸方向に直交するほどにまで屈曲されていない。つまり、負極外部端子軸部１２ａのかしめ部１２ｄの外周面３１と負極集電板基部２１の下面２１ａとの間には隙間Ｓが形成されている。このように、接合部２９の外面側に隙間Ｓが形成されているため、この隙間Ｓを介して、接合部２９の接合状態を確認することができる。 FIG. 8 shows a state after re-caulking the caulking portion 12d of the negative external terminal shaft portion 12a.
As shown in FIG. 8, even after re-caulking, the outer peripheral surface 31 of the caulking portion 12d of the negative electrode external terminal shaft portion 12a is inclined with respect to the axial direction, and is so perpendicular to the axial direction. Not bent up to. That is, a gap S is formed between the outer peripheral surface 31 of the caulking portion 12 d of the negative electrode external terminal shaft portion 12 a and the lower surface 21 a of the negative electrode current collector plate base portion 21. Thus, since the gap S is formed on the outer surface side of the joint portion 29, the joining state of the joint portion 29 can be confirmed through the gap S.

本発明の第１の実施形態によれば、下記の効果を奏する。
（１）捲回電極群３と、正・負極集電板４４、２４と、電池容器と、正・負極外部端子１４、１２とを備え、正・負極外部端子１４、１２は、正・負極集電板４４、２４の正・負極集側貫通孔４６、２６に貫通された正・負極外部端子軸部１４ａ、１２ａを有し、正・負極外部端子軸部１４ａ、１２ａは、正・負極外部端子軸部１４ａ、１２ａにかしめられたかしめ部１４ｄ、１２ｄを有し、正・負極外部端子軸部１４ａ、１２ａのかしめ部１２ｄと正・負極集電板４４、２４の正・負極側集電板貫通孔４５、２５との接触部２８に接合部２９が設けられている。正・負極外部端子軸部１４ａ、１２ａのかしめ部１２ｄと正・負極集電板４４、２４の正・負極側集電板貫通孔４５、２５との接触部２８を接合部２９としたことで、正・負極外部端子軸部１４ａ、１２ａと正・負極集電板４４、２４との接触抵抗が低減され、かつ、接合強度が大きい安定した高品質の接合を得ることができる。 According to the first embodiment of the present invention, the following effects can be obtained.
(1) A wound electrode group 3, positive and negative current collectors 44 and 24, a battery container, and positive and negative external terminals 14 and 12 are provided. The positive and negative external terminals 14 and 12 are positive and negative electrodes. The positive and negative external terminal shaft portions 14a and 12a are inserted into the positive and negative collector side through holes 46 and 26 of the current collector plates 44 and 24. The positive and negative external terminal shaft portions 14a and 12a are positive and negative electrodes. It has caulking portions 14d and 12d that are caulked to the external terminal shaft portions 14a and 12a. The caulking portion 12d of the positive and negative external terminal shaft portions 14a and 12a and the positive and negative current collectors 44 and 24 A joint portion 29 is provided at a contact portion 28 with the electric plate through holes 45 and 25. The contact portion 28 between the caulking portion 12d of the positive / negative electrode external terminal shaft portions 14a, 12a and the positive / negative electrode current collector plate through holes 45, 25 of the positive / negative electrode current collector plates 44, 24 is used as the joint portion 29. The contact resistance between the positive / negative electrode external terminal shaft portions 14a, 12a and the positive / negative electrode current collector plates 44, 24 is reduced, and stable and high-quality bonding with high bonding strength can be obtained.

（２）正・負極外部端子軸部１４ａ、１２ａのかしめ部１４ｄ、１２ｄの外周面３１と正・負極集電板４４、２４との間に隙間Ｓを有している。このため、隙間Ｓを介して、接合部２９の接合状態を確認することができる。 (2) There is a gap S between the outer peripheral surface 31 of the caulking portions 14d and 12d of the positive and negative external terminal shaft portions 14a and 12a and the positive and negative current collecting plates 44 and 24. For this reason, the joining state of the joining part 29 can be confirmed through the gap S.

（３）正・負極外部端子軸部１４ａ、１２ａの前記かしめ部１４ｄ、１２ｄの軸方向端部に凹部１４ｅ、１２ｅが設けられている。このため、正・負極外部端子軸部１４ａ、１２ａのかしめ部１４ｄ、１２ｄは、凹部１４ｅ、１２ｅを中心に周囲に平均的に加圧し、正・負極集電板４４、２４との接合強度を高めることができる。 (3) Concave portions 14e and 12e are provided at axial ends of the caulking portions 14d and 12d of the positive and negative external terminal shaft portions 14a and 12a. For this reason, the caulking portions 14d and 12d of the positive and negative external terminal shaft portions 14a and 12a are pressed on the average around the concave portions 14e and 12e, and the bonding strength between the positive and negative current collector plates 44 and 24 is increased. Can be increased.

−第２の実施形態−
図９は、本発明の第２の実施形態を示す断面図である。図９は、第１の実施形態の図６に相当する図であり、最初のかしめが完了した状態を示す。
第２の実施形態では、負極外部端子軸部１２ａの凹部１２ｅの底面１２ｂは、負極集電板基部２１の下面２１ａより上方に位置している。換言すれば、負極外部端子軸部１２ａの凹部１２ｅの底面１２ｂの高さ位置は、負極集電板基部２１の下面２１ａより、軸方向における負極集電板基部２１の下面２１の反対面側に引っ込んだ位置に配置されている。また、負極外部端子軸部１２ａと負極集電板基部２１の負極側集電板貫通孔２５との寸法関係は、圧入寸法となっている。
第２の実施形態における他の構成は、第１の実施形態と同様であり、対応する部材に同一の符号を付して説明を省略する。
なお、第２の実施形態においても、図９に示す最初のかしめを行った後、第１の実施形態と同様、接触部２８を接合し、この後、再かしめを行う。 -Second Embodiment-
FIG. 9 is a cross-sectional view showing a second embodiment of the present invention. FIG. 9 is a diagram corresponding to FIG. 6 of the first embodiment, and shows a state in which the first caulking is completed.
In the second embodiment, the bottom surface 12 b of the recess 12 e of the negative electrode external terminal shaft portion 12 a is positioned above the lower surface 21 a of the negative electrode current collector plate base 21. In other words, the height position of the bottom surface 12b of the concave portion 12e of the negative electrode external terminal shaft portion 12a is located on the opposite side of the lower surface 21 of the negative electrode current collector plate base 21 in the axial direction from the lower surface 21a of the negative electrode current collector plate base 21. It is placed in the retracted position. The dimensional relationship between the negative electrode external terminal shaft portion 12a and the negative electrode current collector plate through hole 25 of the negative electrode collector plate base 21 is a press-fitting size.
Other configurations in the second embodiment are the same as those in the first embodiment, and the corresponding members are denoted by the same reference numerals and description thereof is omitted.
In the second embodiment as well, after the first caulking shown in FIG. 9 is performed, the contact portion 28 is joined as in the first embodiment, and then re-caulking is performed.

従って、第２の実施形態でも、第１の実施形態と同様な効果を奏する。
また、負極外部端子軸部１２ａの凹部１２ｅの底面１２ｂが、負極集電板基部２１の下面２１ａより上方に位置するため、負極外部端子軸部１２ａの凹部１２ｅの周壁を、より、確実かつ容易に外方に押し広げることができる。これにより、負極外部端子軸部１２ａと負極集電板基部２１の負極側集電板貫通孔２５の周縁部との接触をより確実とすることができる。
さらに、負極外部端子軸部１２ａは負極集電板基部２１の負極側集電板貫通孔２５に圧入されるので、接触部２８における、負極外部端子軸部１２ａと負極集電板基部２１の負極側集電板貫通孔２５の周縁部との接触はより確実となる。 Therefore, the second embodiment also has the same effect as the first embodiment.
Further, since the bottom surface 12b of the concave portion 12e of the negative electrode external terminal shaft portion 12a is located above the lower surface 21a of the negative electrode current collector plate base portion 21, the peripheral wall of the concave portion 12e of the negative electrode external terminal shaft portion 12a can be more reliably and easily Can be spread outward. Thereby, the contact with the peripheral part of the negative electrode side current collection plate through-hole 25 of the negative electrode external terminal shaft part 12a and the negative electrode current collection plate base 21 can be made more reliable.
Further, since the negative electrode external terminal shaft portion 12 a is press-fitted into the negative electrode side current collector plate through hole 25 of the negative electrode current collector plate base 21, the negative electrode external terminal shaft portion 12 a and the negative electrode of the negative electrode current collector plate base portion 21 in the contact portion 28. Contact with the peripheral edge portion of the side current collector plate through-hole 25 is more reliable.

−第３の実施形態−
図１０は、本発明の第３の実施形態を示す断面図である。図９は、第１の実施形態の図８に相当する図である。
第３の実施形態では、負極外部端子軸部１２ａは、軸方向端部に凹部１２ｅを有しておらず、軸方向の全長に亘り、中実なっている。
第３の実施形態においても、負極外部端子軸部１２ａと負極集電板基部２１とのかしめは、かしめ機のヘッドを負極外部端子軸部１２ａの軸方向の端面に押し当てて、軸方向に押圧することにより行う。 -Third embodiment-
FIG. 10 is a cross-sectional view showing a third embodiment of the present invention. FIG. 9 is a diagram corresponding to FIG. 8 of the first embodiment.
In the third embodiment, the negative electrode external terminal shaft portion 12a does not have the recessed portion 12e at the axial end portion, and is solid over the entire length in the axial direction.
Also in the third embodiment, the caulking of the negative electrode external terminal shaft portion 12a and the negative electrode current collector plate base portion 21 is performed by pressing the head of the caulking machine against the axial end surface of the negative electrode external terminal shaft portion 12a in the axial direction. This is done by pressing.

負極外部端子軸部１２ａと負極集電板基部２１の負極側集電板貫通孔２５の関係寸法は、圧入寸法であっても、すきま代が設けられていてもよい。
第３の実施形態における他の構成は第１の実施形態と同様であり、対応する部材に同一の符号を付し、その説明を省略する。 The relational dimension between the negative electrode external terminal shaft portion 12a and the negative electrode current collector plate through hole 25 of the negative electrode collector plate base 21 may be a press fit dimension or a clearance allowance.
Other configurations in the third embodiment are the same as those in the first embodiment, and corresponding members are denoted by the same reference numerals, and description thereof is omitted.

従って、第３の実施形態のおいても、第１の実施形態と同様の効果を奏する。
また、第３の実施形態では、負極外部端子軸部１２ａに凹部１２ｅを形成しないので、負極外部端子軸部１２ａの構造が簡素となり、安価にすることができる。 Therefore, also in the third embodiment, the same effect as in the first embodiment is obtained.
In the third embodiment, since the concave portion 12e is not formed in the negative electrode external terminal shaft portion 12a, the structure of the negative electrode external terminal shaft portion 12a is simplified and can be made inexpensive.

なお、上記各実施形態では、正・負極外部端子軸部１４ａ、１２ａと正・負極集電板基部４１、２１との固定は、かしめ、接合の後、再かしめを行うこととして例示した。しかし、再かしめを行わず、かしめ、接合により、正・負極外部端子軸部１４ａ、１２ａと正・負極集電板基部４１、２１との固定を終了するようにしてもよい。   In the above-described embodiments, the positive and negative electrode external terminal shaft portions 14a and 12a and the positive and negative electrode current collector plate base portions 41 and 21 are fixed by caulking and re-caulking after joining. However, the fixing between the positive / negative electrode external terminal shaft portions 14a, 12a and the positive / negative electrode current collector plate base portions 41, 21 may be terminated by caulking and joining without re-caulking.

上記各実施形態では、正・負極外部端子軸部１４ａ、１２ａと正・負極集電板基部４１、２１とが固定された状態で、正・負極外部端子軸部１４ａ、１２ａのかしめ部１４ｄ、１２ｄの外周面３１と正・負極集電板基部２１の下面４１ａ、２１ａとの間に隙間Ｓが形成されている構造として例示した。しかし、正・負極外部端子軸部１４ａ、１２ａのかしめ部１４ｄ、１２ｄの外周面３１が正・負極集電板基部２１の下面４１ａ、２１に接触するように、かしめ部１４ｄ、１２ｄの外周面３１が軸方向にほぼ垂直になるようにかしめてもよい。   In each of the above embodiments, the positive / negative electrode external terminal shaft portions 14a, 12a and the positive / negative electrode current collector plate base portions 41, 21 are fixed, and the caulking portions 14d of the positive / negative electrode external terminal shaft portions 14a, 12a, This is illustrated as a structure in which a gap S is formed between the outer peripheral surface 31 of 12d and the lower surfaces 41a and 21a of the positive / negative current collector base 21. However, the outer peripheral surfaces of the caulking portions 14d and 12d are arranged such that the outer peripheral surfaces 31 of the caulking portions 14d and 12d of the positive and negative electrode external terminal shaft portions 14a and 12a are in contact with the lower surfaces 41a and 21 of the positive and negative electrode current collector plate base 21. It may be crimped so that 31 is substantially perpendicular to the axial direction.

上記各実施形態では、正・負極集電板４４、２４は、それぞれ、正・負極集電板基部４１、２１および正・負極側接続部４２、２２を有し、正・負極外部端子軸部１４ａ、１２ａは、正・負極集電板基部４１、２１に固定する構造として例示した。しかし、正・負極集電板は、任意な構造とすることが可能であり、本発明は、この任意な構造の正・負極集電板と正・負極外部端子軸部１４ａ、１２ａとを一体化する構造に適用することができる。   In each of the above-described embodiments, the positive / negative electrode current collector plates 44 and 24 have the positive / negative electrode current collector plate base portions 41 and 21 and the positive / negative electrode side connection portions 42 and 22, respectively. 14a and 12a are illustrated as structures fixed to the positive and negative current collector bases 41 and 21. However, the positive / negative electrode current collector plate can have an arbitrary structure, and the present invention integrates the positive / negative electrode current collector plate of this arbitrary structure with the positive / negative electrode external terminal shaft portions 14a, 12a. It can be applied to the structure to be converted.

上記各実施形態では、正・負極外部端子１４、１２の正・負極外部端子出力部１４ｃ、１２ｃをほぼ直方体形状として例示した。しかし、正・負極外部端子出力部の形状は、任意とすることができる。   In each said embodiment, the positive / negative external terminal output part 14c, 12c of the positive / negative external terminals 14 and 12 was illustrated as a substantially rectangular parallelepiped shape. However, the shape of the positive / negative external terminal output portion can be arbitrary.

上記各実施形態では、正・負極外部端子１４、１２を、電池缶１の開口部１ａを塞ぐ電池蓋６に固定する構造として例示した。しかし、正・負極外部端子１４、１２を、電池缶１の側壁に取付けるようにしてもよい。   In each of the above embodiments, the positive and negative external terminals 14 and 12 are exemplified as a structure that is fixed to the battery lid 6 that closes the opening 1 a of the battery can 1. However, the positive and negative external terminals 14 and 12 may be attached to the side wall of the battery can 1.

上記各実施形態では、正・負極外部端子１４、１２の正・負極外部端子軸部１４ａ、１２ａは、正・負極外部端子出力部１４ｃ、１２ｃとは反対側の端部に凹部１４ｅ、１２ｅを有するか、全長に亘り中実であるとして、例示した。しかし、正・負極外部端子軸部１４ａ、１２ａは、ほぼ全長に亘り、軸心部が中空とされた中空軸としてもよい。   In each of the above embodiments, the positive / negative external terminal shaft portions 14a, 12a of the positive / negative external terminals 14, 12 have the recesses 14e, 12e at the end opposite to the positive / negative external terminal output portions 14c, 12c. Illustrated as having or solid throughout. However, the positive / negative external terminal shaft portions 14a and 12a may be hollow shafts having a hollow shaft center portion over almost the entire length.

上記各実施形態では、正極電極３４と負極電極３２とが、セパレータ３３、３５を介して捲回された捲回電極群３を有する二次電池１００として例示した。しかし、本発明は、矩形シート状の正極電極と矩形シート状の負極電極とを、セパレータを介して平坦状に積層した電極群を備える二次電池に適用することができる。   In each said embodiment, the positive electrode 34 and the negative electrode 32 illustrated as the secondary battery 100 which has the winding electrode group 3 wound through the separators 33 and 35. FIG. However, the present invention can be applied to a secondary battery including an electrode group in which a rectangular sheet-shaped positive electrode and a rectangular sheet-shaped negative electrode are laminated in a flat shape with a separator interposed therebetween.

上記各実施形態ではリチウムイオン二次電池を蓄電素子の一例として説明したが、ニッケル水素電池などその他の二次電池にも本発明を適用できる。さらに、電気二重層キャパシタやリチウムイオンキャパシタを蓄電素子とした場合にも本発明を適用できる。   In each of the above embodiments, the lithium ion secondary battery has been described as an example of the storage element, but the present invention can also be applied to other secondary batteries such as a nickel metal hydride battery. Furthermore, the present invention can also be applied when an electric double layer capacitor or a lithium ion capacitor is used as a storage element.

上記では、種々の実施の形態および変形例を説明したが、本発明はこれらの内容に限定されるものではない。本発明の技術的思想の範囲内で考えられるその他の態様も本発明の範囲内に含まれる。   Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

１ 電池缶
３ 捲回電極群（蓄電要素）
６ 電池蓋（一側部）
１２ 負極外部端子
１２ａ 負極外部端子軸部
１２ｂ 底面
１２ｄ かしめ部
１２ｅ 凹部
１４ 正極外部端子
１４ａ 正極外部端子軸部
１４ｂ 底面
１４ｄ かしめ部
１４ｅ 凹部
２１ 負極集電板基部
２１ａ 下面（一面）
２４ 負極集電板
２５ 負極側集電板貫通孔（開口部）
２９ 接合部
３１ 外周面
４１ 正極集電板基部
４１ａ 下面（一面）
４４ 正極集電板
４５ 正極側集電板貫通孔（開口部）
１００ 二次電池（蓄電装置）
１０６ 電池蓋組立体

1 Battery can 3 Winding electrode group (storage element)
6 Battery cover (one side)
12 Negative electrode external terminal 12a Negative electrode external terminal shaft portion 12b Bottom surface 12d Caulking portion 12e Recessed portion 14 Positive electrode external terminal 14a Positive electrode external terminal shaft portion 14b Bottom surface 14d Caulking portion 14e Recessed portion 21 Negative electrode collector plate base portion 21a Lower surface (one surface)
24 Negative electrode current collector plate 25 Negative electrode side current collector plate through hole (opening)
29 Joint 31 Peripheral surface 41 Positive electrode current collector base 41a Lower surface (one surface)
44 Positive current collector plate 45 Positive current collector through-hole (opening)
100 Secondary battery (power storage device)
106 Battery lid assembly

Claims (8)

蓄電要素と、
開口部を有し、前記蓄電要素に接続される集電板と、
前記集電板および前記蓄電要素を収納する電池容器と、
前記電池容器の一側部に設けられ、前記集電板に接続される外部端子とを備え、
前記外部端子は前記集電板の前記開口部に貫通された軸部を有し、
前記軸部は、前記集電板にかしめられたかしめ部を有し、
前記軸部のかしめ部と前記集電板の前記開口部との接触部に接合部が設けられている、蓄電装置。 A storage element;
A current collector having an opening and connected to the power storage element;
A battery container for storing the current collector plate and the power storage element;
An external terminal provided on one side of the battery container and connected to the current collector;
The external terminal has a shaft portion that passes through the opening of the current collector plate,
The shaft portion has a caulking portion that is caulked to the current collector plate,
A power storage device, wherein a joint portion is provided at a contact portion between the caulking portion of the shaft portion and the opening portion of the current collector plate. 請求項１に記載の蓄電装置において、
前記軸部の前記かしめ部における前記接触部より端部側の外周面と前記集電板との間に隙間を有する、蓄電装置。 The power storage device according to claim 1,
The electrical storage apparatus which has a clearance gap between the outer peripheral surface at the edge part side rather than the said contact part in the said crimping part of the said axial part, and the said current collection board. 請求項１記載の蓄電装置において、
前記軸部の前記かしめ部の軸方向の端部に凹部が設けられている、蓄電装置。 The power storage device according to claim 1,
The electrical storage apparatus in which the recessed part is provided in the edge part of the axial direction of the said crimping part of the said axial part. 請求項３に記載の蓄電装置において、
前記軸部の前記凹部の底面は、前記集電板における前記軸部が貫通した側の一面よりも、軸方向おける前記集電板の前記一面の反対面側に引っ込んだ位置に配置されている、蓄電装置。 The power storage device according to claim 3,
The bottom surface of the concave portion of the shaft portion is disposed at a position retracted to the opposite side of the one surface of the current collector plate in the axial direction from one surface of the current collector plate on the side where the shaft portion penetrates. , Power storage device. 請求項１に記載の蓄電装置において、
前記軸部の前記かしめ部は中実である、蓄電装置。 The power storage device according to claim 1,
The power storage device, wherein the caulking portion of the shaft portion is solid. 蓄電要素と、開口部を有し、前記蓄電要素に接続される集電板と、前記開口部に貫通される軸部を有する外部端子とを備えた蓄電装置の製造方法であって、
前記外部端子の前記軸部を前記集電板の前記開口部に貫通して、前記軸部を前記集電板にかしめることと、
前記軸部のかしめ部の外周と前記集電板の前記開口部の周縁部の接触部とを接合すること、とを有する蓄電装置の製造方法。 A method for manufacturing a power storage device, comprising: a power storage element; a current collector plate having an opening and connected to the power storage element; and an external terminal having a shaft portion penetrating the opening.
Penetrating the shaft portion of the external terminal into the opening of the current collector plate, and caulking the shaft portion to the current collector plate;
The manufacturing method of the electrical storage apparatus which has joining the outer periphery of the crimping part of the said axial part, and the contact part of the peripheral part of the said opening part of the said current collecting plate. 請求項６に記載の蓄電装置の製造方法であって、
前記接合することの後に、再度、前記軸部をかしめることを有する蓄電装置の製造方法。 It is a manufacturing method of the electrical storage device according to claim 6,
The manufacturing method of the electrical storage apparatus which has caulking the said axial part again after the said joining. 請求項６に記載の蓄電装置の製造方法であって、
前記軸部を前記集電板の前記開口部に貫通する際、前記軸部を前記集電板の前記開口部に圧入することを含む蓄電装置の製造方法。

It is a manufacturing method of the electrical storage device according to claim 6,
A method for manufacturing a power storage device, comprising: press-fitting the shaft portion into the opening portion of the current collector plate when penetrating the shaft portion into the opening portion of the current collector plate.

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002190314A (en) * 2000-12-20 2002-07-05 Nissan Motor Co Ltd Battery
JP2004014173A (en) * 2002-06-04 2004-01-15 Japan Storage Battery Co Ltd Battery and manufacturing method for battery
WO2015025388A1 (en) * 2013-08-22 2015-02-26 日立オートモティブシステムズ株式会社 Secondary cell
JP2016111012A (en) * 2014-11-28 2016-06-20 三洋電機株式会社 Secondary battery
JP6014808B1 (en) * 2015-08-17 2016-10-26 日立金属株式会社 Battery terminal and battery terminal manufacturing method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002190314A (en) * 2000-12-20 2002-07-05 Nissan Motor Co Ltd Battery
JP2004014173A (en) * 2002-06-04 2004-01-15 Japan Storage Battery Co Ltd Battery and manufacturing method for battery
WO2015025388A1 (en) * 2013-08-22 2015-02-26 日立オートモティブシステムズ株式会社 Secondary cell
JP2016111012A (en) * 2014-11-28 2016-06-20 三洋電機株式会社 Secondary battery
JP6014808B1 (en) * 2015-08-17 2016-10-26 日立金属株式会社 Battery terminal and battery terminal manufacturing method

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