JP2014017081A - Secondary battery - Google Patents

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JP2014017081A
JP2014017081A JP2012152521A JP2012152521A JP2014017081A JP 2014017081 A JP2014017081 A JP 2014017081A JP 2012152521 A JP2012152521 A JP 2012152521A JP 2012152521 A JP2012152521 A JP 2012152521A JP 2014017081 A JP2014017081 A JP 2014017081A
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negative electrode
external terminal
terminal plate
positive electrode
negative
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Sho Nishimaru
翔 西丸
Takuro Tsunaki
拓郎 綱木
Kinya Aota
欣也 青田
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Vehicle Energy Japan Inc
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Hitachi Vehicle Energy Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery the connection resistance of which is reduced.SOLUTION: The secondary battery includes a wound electrode group, a battery can, a battery lid 102, a positive electrode terminal member and a negative electrode terminal member attached to the battery lid, a positive electrode collector 180 connecting the positive electrode of the wound electrode group and the positive electrode terminal member 104, and a negative electrode collector 190 connecting the negative electrode of the wound electrode group and the negative electrode terminal member 105. The negative electrode terminal member 105 has a negative electrode external terminal plate 151 placed on the battery lid 102 via a terminal block 160n for the negative electrode, and a negative electrode connection terminal 155 having one end connected with the negative electrode collector 190 and the other end being caulked to the negative electrode external terminal plate 151. The material of the negative electrode external terminal plate 151 is copper or a copper alloy, a tin plating layer 120 composed of tin having a hardness lower than that of the material of the negative electrode external terminal plate 151 is formed on the surface thereof, and the negative electrode connection terminal 155 is caulked to the negative electrode external terminal plate 151 via the tin plating layer 120.

Description

本発明は、二次電池に関する。   The present invention relates to a secondary battery.

近年、ハイブリッド型の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(Wh)の二次電池が開発されており、その中でもエネルギー密度(Wh/kg)の高い角形のリチウムイオン二次電池が注目されている。   In recent years, secondary batteries with large capacity (Wh) have been developed as power sources for hybrid electric vehicles and pure electric vehicles, and among them, prismatic lithium ion secondary batteries with high energy density (Wh / kg). Is attracting attention.

角形のリチウムイオン二次電池においては、正極箔に正極活物質を塗工した正極電極、負極箔に負極活物質を塗工した負極電極およびそれぞれを絶縁するためのセパレータを重ね合わせて捲回することで扁平形状の捲回電極群が形成される。捲回電極群は、電池容器の電池蓋に設けられた正極端子部材および負極端子部材に電気的に接続される。捲回電極群は、電池容器の電池缶に収容され、電池缶の開口部は電池蓋で封止溶接される。二次電池は、捲回電極群を収容した電池容器の注液孔から電解液が注液された後、注液栓が挿入されてレーザ溶接により封止溶接されることで形成される。   In a rectangular lithium ion secondary battery, a positive electrode coated with a positive electrode active material on a positive electrode foil, a negative electrode coated with a negative electrode active material on a negative electrode foil, and a separator for insulating each of them are rolled up. Thus, a flat wound electrode group is formed. The wound electrode group is electrically connected to a positive electrode terminal member and a negative electrode terminal member provided on the battery lid of the battery container. The wound electrode group is accommodated in a battery can of the battery container, and the opening of the battery can is sealed and welded with a battery lid. A secondary battery is formed by injecting an electrolytic solution from a liquid injection hole of a battery container containing a wound electrode group, and then inserting a liquid injection stopper and sealingly welding it by laser welding.

複数の二次電池の正極端子部材と負極端子部材とをバスバーなどの導電部材で電気的に接続することで組電池が形成される。バスバーは、ボルト、ナットによる締結部材により、あるいは、溶接により二次電池に接続される。特許文献1には、端子部材として外部端子板と接続端子とを備え、接続端子と外部端子板とが電池蓋にカシメ固定された後、接続端子と外部端子とがレーザ光で4カ所、スポット溶接された二次電池が開示されている。   An assembled battery is formed by electrically connecting the positive electrode terminal members and the negative electrode terminal members of a plurality of secondary batteries with a conductive member such as a bus bar. The bus bar is connected to the secondary battery by a fastening member such as a bolt and a nut, or by welding. In Patent Document 1, an external terminal plate and a connection terminal are provided as terminal members. After the connection terminal and the external terminal plate are caulked and fixed to the battery lid, the connection terminal and the external terminal are spotted at four locations by laser light. A welded secondary battery is disclosed.

特開2012−54203号公報JP 2012-54203 A

たとえば、純粋な電気自動車のように大きな出力が要求される二次電池では、二次電池に大電流が流れることになる。このため、接続端子や外部端子板などの導電部材間の接続抵抗は低いことが望ましい。特許文献1に記載の二次電池では、負極外部端子板に対して直接に負極接続端子がカシメ固定されている。しかしながら、負極外部端子板と負極接続端子のカシメ部との密着性は、必ずしも良好ではなく、接続抵抗を低減させるために密着性を向上させる点で改善の余地があった。   For example, in a secondary battery that requires a large output, such as a pure electric vehicle, a large current flows through the secondary battery. For this reason, it is desirable that the connection resistance between conductive members such as connection terminals and external terminal plates be low. In the secondary battery described in Patent Document 1, the negative electrode connection terminal is caulked and fixed directly to the negative electrode external terminal plate. However, the adhesion between the negative electrode external terminal plate and the caulking portion of the negative electrode connection terminal is not always good, and there is room for improvement in terms of improving the adhesion to reduce the connection resistance.

本発明は、正極電極および負極電極をセパレータを介在させて捲回した捲回電極群と、捲回電極群を収容する電池缶と、電池缶を封止する電池蓋と、電池蓋に取り付けられた正極端子部材および負極端子部材と、正極電極と正極端子部材とを接続する正極集電体と、負極電極と負極端子部材とを接続する負極集電体とを備え、負極端子部材は、電池蓋上に絶縁部材を介して配置される負極外部端子板と、一端が負極集電体に接続され、他端が負極外部端子板にカシメられる負極接続端子とを有し、負極外部端子板の材質は、銅または銅合金であって、負極外部端子板の表面には、負極外部端子板の材質よりも硬度の低い材質からなる金属メッキ層が形成され、負極接続端子は、金属メッキ層を介して負極外部端子板にカシメられていることを特徴とする二次電池である。   The present invention includes a wound electrode group in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a battery can that houses the wound electrode group, a battery lid that seals the battery can, and a battery lid. A positive electrode terminal member, a negative electrode terminal member, a positive electrode current collector that connects the positive electrode and the positive electrode terminal member, and a negative electrode current collector that connects the negative electrode and the negative electrode terminal member. A negative electrode external terminal plate disposed on the lid via an insulating member; a negative electrode connection terminal having one end connected to the negative electrode current collector and the other end crimped to the negative electrode external terminal plate; The material is copper or copper alloy, and the surface of the negative electrode external terminal plate is formed with a metal plating layer made of a material whose hardness is lower than that of the negative electrode external terminal plate. That it is crimped to the negative external terminal plate It is a secondary battery to be butterflies.

本発明によれば、負極接続端子が金属メッキ層を介して負極外部端子板にカシメられるため、負極カシメ部を金属メッキ層に良好に密着させることができる。   According to the present invention, since the negative electrode connection terminal is crimped to the negative electrode external terminal plate via the metal plating layer, the negative electrode crimping portion can be satisfactorily adhered to the metal plating layer.

本発明の実施の形態に係る二次電池の外観を示す斜視図。The perspective view which shows the external appearance of the secondary battery which concerns on embodiment of this invention. 二次電池の構成を示す分解斜視図。The disassembled perspective view which shows the structure of a secondary battery. 捲回電極群を示す斜視図。The perspective view which shows the winding electrode group. 電池蓋組立体を示す分解斜視図。The disassembled perspective view which shows a battery cover assembly. (a)は電池蓋に取り付けられた負極端子部材を示す平面図、(b)は電池蓋に取り付けられた正極端子部材を示す平面図。(A) is a top view which shows the negative electrode terminal member attached to the battery cover, (b) is a top view which shows the positive electrode terminal member attached to the battery cover. (a)は図5(a)のA−A線切断断面図、(b)は図5(b)のB−B線切断断面図。(A) is the sectional view on the AA line of Fig.5 (a), (b) is the sectional view on the BB line of FIG.5 (b). (a)は本実施の形態に係る二次電池の負極接続端子のカシメ部と錫メッキ層との密着性を説明する図、(b)および(c)は比較例に係る二次電池の負極接続端子のカシメ部と負極外部端子板との密着性を説明する図。(A) is a figure explaining the adhesiveness of the crimping part of the negative electrode connection terminal of the secondary battery which concerns on this Embodiment, and a tin plating layer, (b) and (c) are the negative electrodes of the secondary battery which concerns on a comparative example The figure explaining the adhesiveness of the crimping part of a connecting terminal, and a negative electrode external terminal board. (a)は本実施の形態に係る二次電池の負極外部端子板の錫メッキ層を示す図、(b)および(c)は変形例に係る二次電池の負極外部端子板の錫メッキ層を示す図。(A) is a figure which shows the tin plating layer of the negative electrode external terminal board of the secondary battery which concerns on this Embodiment, (b) and (c) are the tin plating layers of the negative electrode external terminal board of the secondary battery which concerns on a modification. FIG.

以下、本発明による二次電池を角形リチウムイオン電池に適用した実施の形態を、図面を参照して説明する。
図1は二次電池100の外観を示す斜視図であり、図2は二次電池100の構成を示す分解斜視図である。
Hereinafter, embodiments in which a secondary battery according to the present invention is applied to a prismatic lithium ion battery will be described with reference to the drawings.
FIG. 1 is a perspective view showing the appearance of the secondary battery 100, and FIG. 2 is an exploded perspective view showing the configuration of the secondary battery 100.

図1に示すように、二次電池100は、電池缶101と電池蓋102とからなる電池容器を備えている。電池缶101および電池蓋102の材質は、アルミニウムまたはアルミニウム合金などである。図2に示すように、電池缶101は、一対の幅広面101aと一対の幅狭面101bと底面101cとを有し、上面が開口された矩形箱状に形成されている。   As shown in FIG. 1, the secondary battery 100 includes a battery container including a battery can 101 and a battery lid 102. The material of the battery can 101 and the battery lid 102 is aluminum or an aluminum alloy. As shown in FIG. 2, the battery can 101 has a pair of wide surfaces 101a, a pair of narrow surfaces 101b, and a bottom surface 101c, and is formed in a rectangular box shape having an open top surface.

図2に示すように、電池缶101には捲回電極群170が収容されている。捲回電極群170は、電池蓋組立体107によって保持される。捲回電極群170は絶縁ケース(不図示)に覆われた状態で電池缶101に収容される。絶縁ケースの材質は、ポリプロピレン等の絶縁性を有する樹脂である。これにより、電池缶101の底面および側面と、捲回電極群170とは電気的に絶縁される。   As shown in FIG. 2, the wound electrode group 170 is accommodated in the battery can 101. The wound electrode group 170 is held by the battery lid assembly 107. The wound electrode group 170 is accommodated in the battery can 101 while being covered with an insulating case (not shown). The material of the insulating case is an insulating resin such as polypropylene. As a result, the bottom and side surfaces of the battery can 101 and the wound electrode group 170 are electrically insulated.

図1に示すように、電池蓋102は、矩形平板状であって、電池缶101の開口を塞ぐように溶接されている。つまり、電池蓋102は、電池缶101を封止している。図2に示すように、電池蓋102の一端には捲回電極群170の正極電極174と電気的に接続される正極端子部材104が取り付けられ、電池蓋102の他端には捲回電極群170の負極電極175と電気的に接続される負極端子部材105が取り付けられている。   As shown in FIG. 1, the battery lid 102 has a rectangular flat plate shape and is welded so as to close the opening of the battery can 101. That is, the battery lid 102 seals the battery can 101. As shown in FIG. 2, a positive electrode terminal member 104 that is electrically connected to the positive electrode 174 of the wound electrode group 170 is attached to one end of the battery lid 102, and the wound electrode group is attached to the other end of the battery lid 102. A negative electrode terminal member 105 electrically connected to the negative electrode 175 of 170 is attached.

正極端子部材104が捲回電極群170の正極電極174に電気的に接続され、負極端子部材105が捲回電極群170の負極電極175に電気的に接続される。このため、正極端子部材104および負極端子部材105を介して外部負荷に電力が供給され、あるいは、正極端子部材104および負極端子部材105を介して外部発電電力が捲回電極群170に供給されて充電される。   The positive electrode terminal member 104 is electrically connected to the positive electrode 174 of the wound electrode group 170, and the negative electrode terminal member 105 is electrically connected to the negative electrode 175 of the wound electrode group 170. For this reason, electric power is supplied to the external load via the positive electrode terminal member 104 and the negative electrode terminal member 105, or external generated power is supplied to the wound electrode group 170 via the positive electrode terminal member 104 and the negative electrode terminal member 105. Charged.

図示しないが、複数の二次電池が並置されて、隣接する二次電池の正極端子部材104と負極端子部材105とが金属製の板材からなるバスバーによって電気的に接続されることで、複数の二次電池からなる組電池が形成される。本実施の形態では、正極端子部材104の正極ボルト部材149と、負極端子部材105の負極ボルト部材159にバスバーの貫通孔が挿通され、正極ボルト部材149および負極ボルト部材159のそれぞれにナットが締め付けられることで、複数の二次電池が接続される。   Although not shown, a plurality of secondary batteries are juxtaposed, and the positive electrode terminal member 104 and the negative electrode terminal member 105 of the adjacent secondary battery are electrically connected by a bus bar made of a metal plate material. An assembled battery composed of secondary batteries is formed. In the present embodiment, the through hole of the bus bar is inserted into the positive electrode bolt member 149 of the positive electrode terminal member 104 and the negative electrode bolt member 159 of the negative electrode terminal member 105, and a nut is tightened to each of the positive electrode bolt member 149 and the negative electrode bolt member 159. As a result, a plurality of secondary batteries are connected.

図2に示すように、電池蓋102には、電池容器内に電解液を注入するための注液孔106aが穿設されている。注液孔106aは、電解液注入後に注液栓106bによって封止される。電解液としては、たとえば、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(LiPF)等のリチウム塩が溶解された非水電解液を用いることができる。 As shown in FIG. 2, the battery lid 102 is provided with a liquid injection hole 106a for injecting an electrolytic solution into the battery container. The liquid injection hole 106a is sealed by a liquid injection plug 106b after the electrolytic solution is injected. As the electrolytic solution, for example, a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonate-based organic solvent such as ethylene carbonate can be used.

電池蓋102には、ガス排出弁103が設けられている。ガス排出弁103は、プレス加工によって電池蓋102を部分的に薄肉化することで形成されている。ガス排出弁103は、二次電池100が過充電等の異常により発熱してガスが発生し、電池容器内の圧力が上昇して所定圧力に達したときに開裂して、内部からガスを排出することで電池容器内の圧力を低減させる。   The battery cover 102 is provided with a gas discharge valve 103. The gas discharge valve 103 is formed by partially thinning the battery lid 102 by press working. The gas discharge valve 103 is heated when the secondary battery 100 generates heat due to an abnormality such as overcharge, and when the pressure in the battery container rises and reaches a predetermined pressure, the gas discharge valve 103 is opened and discharges the gas from the inside. By doing so, the pressure in the battery container is reduced.

図3は捲回電極群170を示す斜視図である。図3では、捲回電極群170の巻き終り側を展開した状態を示している。図3を参照して、捲回電極群170について説明する。蓄電要素である捲回電極群170は、長尺状の正極電極174および負極電極175をセパレータ173a,173bを介在させて捲回中心軸W周りに扁平形状に捲回することで積層構造とされている。   FIG. 3 is a perspective view showing the wound electrode group 170. FIG. 3 shows a state in which the winding end side of the wound electrode group 170 is developed. The wound electrode group 170 will be described with reference to FIG. The wound electrode group 170, which is a power storage element, has a laminated structure by winding a long positive electrode 174 and a negative electrode 175 in a flat shape around the wound central axis W with separators 173a and 173b interposed therebetween. ing.

正極電極174は、正極活物質合剤が正極箔171の両面に塗工された正極塗工部176aと、正極活物質合剤が正極箔171の両面に塗工されていない正極未塗工部176bとを有している。正極活物質合剤は、正極活物質に結着材(バインダ)が配合されてなる。負極電極175は、負極活物質合剤が負極箔172の両面に塗工された負極塗工部177aと、負極活物質合剤が負極箔172の両面に塗工されていない負極未塗工部177bとを有している。負極活物質合剤は、負極活物質に結着材(バインダ)が配合されてなる。正極活物質と負極活物質との間では、充放電が行われる。   The positive electrode 174 includes a positive electrode coating portion 176a in which a positive electrode active material mixture is applied to both surfaces of the positive electrode foil 171 and a positive electrode uncoated portion in which the positive electrode active material mixture is not applied to both surfaces of the positive electrode foil 171. 176b. The positive electrode active material mixture is formed by blending a binder (binder) with the positive electrode active material. The negative electrode 175 includes a negative electrode coated portion 177a in which the negative electrode active material mixture is applied to both surfaces of the negative electrode foil 172, and a negative electrode uncoated portion in which the negative electrode active material mixture is not applied to both surfaces of the negative electrode foil 172. 177b. The negative electrode active material mixture is formed by blending a negative electrode active material with a binder. Charging / discharging is performed between the positive electrode active material and the negative electrode active material.

正極箔171は厚さ20μm程度のアルミニウム箔である。正極活物質合剤は、正極活物質としてマンガン酸リチウム(化学式LiMn)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重量部のポリフッ化ビニリデン(以下、PVDFと記す。)とを添加し、これに分散溶媒としてN−メチルビロリドン(以下、NMPと記す。)を添加、混練して作製する。この正極活物質合剤を正極箔171の両面に正極未塗工部176bを残して塗工する。その後、乾燥、プレス、裁断して正極電極174を得る。 The positive foil 171 is an aluminum foil having a thickness of about 20 μm. The positive electrode active material mixture is composed of 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of polyvinylidene fluoride as a binder with respect to 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material. Hereinafter, PVDF is added), and N-methylpyrrolidone (hereinafter, referred to as NMP) is added and kneaded as a dispersion solvent. This positive electrode active material mixture is applied to both surfaces of the positive foil 171 leaving the positive electrode uncoated portions 176b. Thereafter, drying, pressing, and cutting are performed to obtain the positive electrode 174.

負極箔172は厚さ10μm程度の銅箔である。負極活物質合剤は、負極活物質として非晶質炭素粉末100重量部に対して、結着剤として10重量部のPVDFを添加し、これに分散溶媒としてNMPを添加、混練して作製する。この負極活物質合剤を負極箔172の両面に負極未塗工部177bを残して塗工する。その後、乾燥、プレス、裁断して負極電極175を得る。   The negative foil 172 is a copper foil having a thickness of about 10 μm. The negative electrode active material mixture is prepared by adding 10 parts by weight of PVDF as a binder to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and adding and kneading NMP as a dispersion solvent thereto. . The negative electrode active material mixture is applied to both surfaces of the negative electrode foil 172 leaving the negative electrode uncoated portions 177b. Thereafter, drying, pressing, and cutting are performed to obtain the negative electrode 175.

捲回電極群170は、捲回電極群170の幅方向(捲回方向に直交する捲回中心軸W方向)の一端部に正極未塗工部176b(正極箔171の露出部)の積層部が設けられ、捲回電極群170の幅方向の他端部に負極未塗工部177b(負極箔172の露出部)の積層部が設けられている。正極未塗工部176bの積層体および負極未塗工部177bの積層体は、図示しないが、それぞれ予め押し潰され、捲回電極群170の厚み方向中心側から電池缶101の両幅広面101a側に向かってV字状に押し広げられることで一対の束状電極接続部に分離される。一対の正極束状電極接続部が、電池蓋組立体107の正極集電体180(図2参照)と超音波接合され、一対の負極束状電極接続部が電池蓋組立体107の負極集電体190(図2参照)と超音波接合されることで、電極群組立体が形成される。   The wound electrode group 170 is a laminated portion of a positive electrode uncoated portion 176b (exposed portion of the positive foil 171) at one end portion in the width direction of the wound electrode group 170 (the wound central axis W direction orthogonal to the wound direction). And a laminated portion of a negative electrode uncoated portion 177b (exposed portion of the negative foil 172) is provided at the other end in the width direction of the wound electrode group 170. Although not shown, the laminate of the positive electrode uncoated portion 176b and the laminate of the negative electrode uncoated portion 177b are crushed in advance, and both wide surfaces 101a of the battery can 101 are formed from the center in the thickness direction of the wound electrode group 170. It is separated into a pair of bundle electrode connection parts by being spread in a V shape toward the side. The pair of positive electrode bundle electrode connections are ultrasonically bonded to the positive electrode current collector 180 (see FIG. 2) of the battery lid assembly 107, and the pair of negative electrode bundle electrode connections are the negative electrode current collector of the battery lid assembly 107. The electrode assembly is formed by ultrasonic bonding with the body 190 (see FIG. 2).

図2および図4を参照して負極端子部材105および正極端子部材104の構成を詳しく説明する。図4は電池蓋組立体107を示す分解斜視図である。図4では負極側の構成を示しているが、正極端子部材104も負極端子部材105と同様の形状、構成であるため、便宜上、かっこ書きで正極側の構成要素の参照番号を付している。   The configuration of the negative terminal member 105 and the positive terminal member 104 will be described in detail with reference to FIGS. FIG. 4 is an exploded perspective view showing the battery lid assembly 107. Although FIG. 4 shows the configuration on the negative electrode side, since the positive electrode terminal member 104 has the same shape and configuration as the negative electrode terminal member 105, the reference numerals of the components on the positive electrode side are given in parentheses for convenience. .

図2に示すように、電池蓋組立体107は、電池蓋102と、電池蓋102に取り付けられた負極端子部材105および正極端子部材104と、負極電極175と負極端子部材105とを電気的に接続する負極集電体190および正極電極174と正極端子部材104とを電気的に接続する正極集電体180とを含んで構成されている。負極端子部材105は、電池蓋102上に負極用端子台160nを介して配置される負極外部端子板151と、負極外部端子板151および負極集電体190に接続された負極接続端子155と、ナット(不図示)が締め付けられる負極ボルト部材159とを有している。同様に、正極端子部材104は、電池蓋102上に正極用端子台160pを介して配置される正極外部端子板141と、正極外部端子板141および正極集電体180に接続された正極接続端子145と、ナット(不図示)が締め付けられる正極ボルト部材149とを有している。負極ボルト部材159および正極ボルト部材149の材質は、ステンレス鋼やクロムモリブデン鋼等の合金鋼である。   As shown in FIG. 2, the battery lid assembly 107 electrically connects the battery lid 102, the negative electrode terminal member 105 and the positive electrode terminal member 104 attached to the battery lid 102, the negative electrode 175, and the negative electrode terminal member 105. A negative electrode current collector 190 and a positive electrode current collector 180 that electrically connect the positive electrode electrode 174 and the positive electrode terminal member 104 are configured. The negative electrode terminal member 105 includes a negative electrode external terminal plate 151 disposed on the battery lid 102 via a negative electrode terminal block 160n, a negative electrode connection terminal 155 connected to the negative electrode external terminal plate 151 and the negative electrode current collector 190, And a negative electrode bolt member 159 to which a nut (not shown) is fastened. Similarly, the positive electrode terminal member 104 includes a positive electrode external terminal plate 141 disposed on the battery lid 102 via a positive electrode terminal block 160p, and a positive electrode connection terminal connected to the positive electrode external terminal plate 141 and the positive electrode current collector 180. 145 and a positive bolt member 149 to which a nut (not shown) is fastened. The material of the negative electrode bolt member 159 and the positive electrode bolt member 149 is alloy steel such as stainless steel or chrome molybdenum steel.

負極外部端子板151、負極接続端子155および負極集電体190の材質は銅である。正極外部端子板141、正極接続端子145および正極集電体180の材質はアルミニウムである。図4に示すように、負極端子部材105は、負極用端子台160nおよび負極用ガスケット109nを介して電池蓋102に取り付けられる。同様に、正極端子部材104は、正極用端子台160pおよび正極用ガスケット109pを介して電池蓋102に取り付けられる。負極用端子台160nおよび正極用端子台160p、ならびに、負極用ガスケット109nおよび正極用ガスケット109pの材質はポリブチレンテレフタレート樹脂やポリフェニレンサルファイド樹脂、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部材である。   The material of the negative electrode external terminal plate 151, the negative electrode connection terminal 155, and the negative electrode current collector 190 is copper. The material of the positive electrode external terminal plate 141, the positive electrode connection terminal 145, and the positive electrode current collector 180 is aluminum. As shown in FIG. 4, the negative electrode terminal member 105 is attached to the battery lid 102 via a negative electrode terminal block 160n and a negative electrode gasket 109n. Similarly, the positive electrode terminal member 104 is attached to the battery lid 102 via the positive electrode terminal block 160p and the positive electrode gasket 109p. The material of the negative electrode terminal block 160n and the positive electrode terminal block 160p, and the negative electrode gasket 109n and the positive electrode gasket 109p is an insulating resin member such as polybutylene terephthalate resin, polyphenylene sulfide resin, and perfluoroalkoxy fluorine resin.

図4に示すように、負極外部端子板151は、平板状部材であって、一端側に4隅が丸みを帯びた矩形平板状の端子取付部153が設けられ、他端側に4隅が丸みを帯びた矩形平板状のバスバー当接部152が設けられている。端子取付部153とバスバー当接部152との間にはくびれ部154が設けられている。   As shown in FIG. 4, the negative external terminal plate 151 is a flat plate-shaped member, and is provided with a terminal mounting portion 153 having a rectangular flat plate shape with rounded four corners on one end side and four corners on the other end side. A rounded rectangular flat bus bar abutting portion 152 is provided. A constricted portion 154 is provided between the terminal attaching portion 153 and the bus bar abutting portion 152.

端子取付部153は負極接続端子155が取り付けられる部分であって、端子取付部153には後述の負極接続端子155の先端側貫通部156aが挿通される円形状の貫通孔153hが設けられている。バスバー当接部152はバスバー(不図示)が当接される部分であって、バスバー当接部152には後述の負極ボルト部材159の軸部159aが挿通される円形状のボルト挿通孔152hが設けられている。   The terminal attachment portion 153 is a portion to which the negative electrode connection terminal 155 is attached, and the terminal attachment portion 153 is provided with a circular through hole 153h into which a distal end side through portion 156a of a negative electrode connection terminal 155 described later is inserted. . The bus bar abutting portion 152 is a portion with which a bus bar (not shown) is abutted. The bus bar abutting portion 152 has a circular bolt insertion hole 152h into which a shaft portion 159a of a negative electrode bolt member 159 described later is inserted. Is provided.

同様に、正極外部端子板141は、平板状部材であって、一端側に4隅が丸みを帯びた矩形平板状の端子取付部143が設けられ、他端側に4隅が丸みを帯びた矩形平板状のバスバー当接部142が設けられている。端子取付部143とバスバー当接部142との間にはくびれ部144が設けられている。   Similarly, the positive electrode external terminal plate 141 is a flat plate-like member, and is provided with a rectangular plate-like terminal mounting portion 143 with four rounded corners on one end side, and with four rounded corners on the other end side. A rectangular flat bus bar abutting portion 142 is provided. A constricted portion 144 is provided between the terminal attaching portion 143 and the bus bar abutting portion 142.

端子取付部143は正極接続端子145が取り付けられる部分であって、端子取付部143には後述の正極接続端子145の先端側貫通部146aが挿通される円形状の貫通孔143hが設けられている。バスバー当接部142はバスバー(不図示)が当接される部分であって、バスバー当接部142には後述の正極ボルト部材149の軸部149aが挿通される円形状のボルト挿通孔142hが設けられている。   The terminal attaching portion 143 is a portion to which the positive electrode connecting terminal 145 is attached. The terminal attaching portion 143 is provided with a circular through hole 143h into which a distal end side through portion 146a of the positive electrode connecting terminal 145 described later is inserted. . The bus bar abutting portion 142 is a portion with which a bus bar (not shown) abuts, and the bus bar abutting portion 142 has a circular bolt insertion hole 142h into which a shaft portion 149a of a positive electrode bolt member 149 described later is inserted. Is provided.

後述するように、負極外部端子板151の端子取付部153の上表面、すなわち負極用端子台160nに接する側と反対側の面には、錫メッキ層120が形成されている(図5(a)および図6(a)参照)。これに対して、正極外部端子板141の端子取付部143の上表面、すなわち正極用端子台160pに接する側と反対側の面には、錫メッキ層が形成されていない(図5(b)および図6(b)参照)。   As will be described later, a tin plating layer 120 is formed on the upper surface of the terminal mounting portion 153 of the negative electrode external terminal plate 151, that is, the surface opposite to the side in contact with the negative electrode terminal block 160n (FIG. 5A ) And FIG. 6 (a)). On the other hand, a tin plating layer is not formed on the upper surface of the terminal mounting portion 143 of the positive external terminal plate 141, that is, the surface opposite to the side in contact with the positive terminal block 160p (FIG. 5B). And FIG. 6 (b)).

負極ボルト部材159は、矩形板状の頭部159bと、おねじが形成された軸部159aとを有している。同様に、正極ボルト部材149は、矩形板状の頭部149bと、おねじが形成された軸部149aとを有している。   The negative electrode bolt member 159 has a rectangular plate-shaped head portion 159b and a shaft portion 159a on which a male screw is formed. Similarly, the positive bolt member 149 has a rectangular plate-shaped head portion 149b and a shaft portion 149a on which a male screw is formed.

図4に示すように、負極用端子台160nは、負極外部端子板151が嵌合される嵌合凹部165nを有している。嵌合凹部165nは、負極外部端子板151と電池蓋102との間に介在されるベース部161nと、ベース部161nの外縁部の全周から負極外部端子板151側に向かって立ち上がる側壁163nとによって構成されている。ベース部161nには、負極外部端子板151のバスバー当接部152に対向する位置において電池蓋102側に向かって窪んだ凹部162nが設けられている。凹部162nには、負極ボルト部材159の頭部159bが収容される。負極用端子台160nの電池蓋102側の面には、凹部162nに対応して電池蓋102側に突設された凸部(不図示)が形成されている。絶縁性を有する負極用端子台160nのベース部161nが、負極外部端子板151と電池蓋102との間に介在されるため、負極外部端子板151と電池蓋102とは電気的に絶縁される。   As shown in FIG. 4, the negative terminal block 160 n has a fitting recess 165 n into which the negative external terminal plate 151 is fitted. The fitting recess 165n includes a base portion 161n interposed between the negative electrode external terminal plate 151 and the battery lid 102, and a side wall 163n that rises from the entire periphery of the outer edge of the base portion 161n toward the negative electrode external terminal plate 151 side. It is constituted by. The base portion 161n is provided with a concave portion 162n that is recessed toward the battery lid 102 at a position facing the bus bar abutting portion 152 of the negative electrode external terminal plate 151. A head 159b of the negative electrode bolt member 159 is accommodated in the recess 162n. On the surface of the negative terminal block 160n on the battery lid 102 side, a convex portion (not shown) is provided so as to project from the battery lid 102 side corresponding to the concave portion 162n. Since the base portion 161n of the negative electrode terminal block 160n having an insulating property is interposed between the negative electrode external terminal plate 151 and the battery cover 102, the negative electrode external terminal plate 151 and the battery cover 102 are electrically insulated. .

同様に、正極用端子台160pは、正極外部端子板141が嵌合される嵌合凹部165pを有している。嵌合凹部165pは、正極外部端子板141と電池蓋102との間に介在されるベース部161pと、ベース部161pの外縁部の全周から正極外部端子板141側に向かって立ち上がる側壁163pとによって構成されている。ベース部161pには、正極外部端子板141のバスバー当接部142に対向する位置において電池蓋102側に向かって窪んだ凹部162pが設けられている。凹部162pには、正極ボルト部材149の頭部149bが収容される。正極用端子台160pの電池蓋102側の面には、凹部162pに対応して電池蓋102側に突設された凸部(不図示)が形成されている。絶縁性を有する正極用端子台160pのベース部161pが、正極外部端子板141と電池蓋102との間に介在されるため、正極外部端子板141と電池蓋102とは電気的に絶縁される。   Similarly, the positive terminal block 160p has a fitting recess 165p into which the positive external terminal plate 141 is fitted. The fitting recess 165p includes a base portion 161p interposed between the positive electrode external terminal plate 141 and the battery lid 102, and a side wall 163p that rises from the entire periphery of the outer edge of the base portion 161p toward the positive electrode external terminal plate 141 side. It is constituted by. The base portion 161p is provided with a concave portion 162p that is recessed toward the battery lid 102 at a position facing the bus bar abutting portion 142 of the positive electrode external terminal plate 141. A head 149b of the positive electrode bolt member 149 is accommodated in the recess 162p. On the surface of the positive electrode terminal block 160p on the battery lid 102 side, a convex portion (not shown) that protrudes on the battery lid 102 side corresponding to the concave portion 162p is formed. Since the base portion 161p of the positive electrode terminal block 160p having an insulating property is interposed between the positive electrode external terminal plate 141 and the battery cover 102, the positive electrode external terminal plate 141 and the battery cover 102 are electrically insulated. .

負極用端子台160nの側壁163nの内面形状は負極外部端子板151の外形形状に対応して形成されており、負極外部端子板151は負極用端子台160nの側壁163nの内側に嵌合される。正極用端子台160pの側壁163pの内面形状は正極外部端子板141の外形形状に対応して形成されており、正極外部端子板141は正極用端子台160pの側壁163pの内側に嵌合される。   The inner surface shape of the side wall 163n of the negative electrode terminal block 160n is formed corresponding to the outer shape of the negative electrode external terminal plate 151, and the negative electrode external terminal plate 151 is fitted inside the side wall 163n of the negative electrode terminal block 160n. . The inner surface shape of the side wall 163p of the positive terminal block 160p is formed to correspond to the outer shape of the positive external terminal plate 141, and the positive external terminal plate 141 is fitted inside the side wall 163p of the positive terminal block 160p. .

図4に示すように、負極用端子台160nのベース部161nには後述の負極接続端子155の基端側貫通部156bが挿通される円形状の貫通孔164nが設けられている。同様に、正極用端子台160pのベース部161pには後述の正極接続端子145の基端側貫通部146bが挿通される円形状の貫通孔164pが設けられている。   As shown in FIG. 4, the base portion 161n of the negative terminal block 160n is provided with a circular through hole 164n into which a base end side through portion 156b of a negative electrode connection terminal 155 described later is inserted. Similarly, the base portion 161p of the positive electrode terminal block 160p is provided with a circular through hole 164p through which a base end side through portion 146b of a positive electrode connection terminal 145 described later is inserted.

電池蓋102には電池缶内側に向かって窪むように形成された一対の凹部122と、後述の負極接続端子155の基端側貫通部156bおよび正極接続端子145の基端側貫通部146bが挿通される一対の貫通孔124が設けられている。一対の凹部122は、上記したバスバー当接部142,152に対向する位置に設けられている。この凹部122には、上記した正負極用端子台160p,160nに設けられた凸部(不図示)が嵌合される。   The battery lid 102 is inserted with a pair of recesses 122 formed so as to be recessed toward the inside of the battery can, a base end side through portion 156b of a negative electrode connection terminal 155 described later, and a base end side through portion 146b of the positive electrode connection terminal 145. A pair of through holes 124 are provided. The pair of recesses 122 are provided at positions facing the above-described bus bar contact portions 142 and 152. The concave portion 122 is fitted with convex portions (not shown) provided on the above-described positive and negative terminal blocks 160p and 160n.

図4に示すように、負極用ガスケット109nおよび正極用ガスケット109pは、それぞれ円筒状の筒部と、筒部の下端に設けられた鍔部とを備えている。負極用ガスケット109nは、後述の負極接続端子155の基端側貫通部156bに装着され、正極用ガスケット109pは、後述の正極接続端子145の基端側貫通部146bに装着される。   As shown in FIG. 4, each of the negative electrode gasket 109n and the positive electrode gasket 109p includes a cylindrical tube portion and a flange portion provided at the lower end of the tube portion. The negative electrode gasket 109n is attached to a proximal end side through portion 156b of a later-described negative electrode connection terminal 155, and the positive electrode gasket 109p is attached to a proximal end side through portion 146b of a later-described positive electrode connection terminal 145.

負極用ガスケット109nは、電池蓋102と負極接続端子155との間に介在するように配置されて、電池蓋102と負極接続端子155との間が封止されている(図6(a)参照)。同様に、正極用ガスケット109pは、電池蓋102と正極接続端子145との間に介在するように配置されて、電池蓋102と正極接続端子145との間が封止されている(図6(b)参照)。負極用ガスケット109nおよび正極用ガスケット109pは、上記したように絶縁性を有しているため、負極接続端子155および正極接続端子145と電池蓋102とは電気的に絶縁されている。   The negative electrode gasket 109n is disposed so as to be interposed between the battery lid 102 and the negative electrode connection terminal 155, and the gap between the battery lid 102 and the negative electrode connection terminal 155 is sealed (see FIG. 6A). ). Similarly, the positive electrode gasket 109p is disposed so as to be interposed between the battery lid 102 and the positive electrode connection terminal 145, and the gap between the battery lid 102 and the positive electrode connection terminal 145 is sealed (FIG. 6 ( b)). Since the negative electrode gasket 109n and the positive electrode gasket 109p have insulation properties as described above, the negative electrode connection terminal 155 and the positive electrode connection terminal 145 are electrically insulated from the battery lid 102.

図2および図4に示すように、負極集電体190は、電池蓋102の内面に沿う座面部191と、座面部191の長辺両側部から略直角に曲がって、電池缶101の幅広面101aに沿いながら電池缶101の底面101cに向かって延在する平面板192と、平面板192の下端に設けた傾斜部195により接続される接合平面部193とを備えている。座面部191には、負極接続端子155が取り付けられる貫通孔194が設けられている。   As shown in FIGS. 2 and 4, the negative electrode current collector 190 includes a seat surface portion 191 along the inner surface of the battery lid 102, and a wide surface of the battery can 101 by bending substantially at right angles from both sides of the long side of the seat surface portion 191. A flat plate 192 extending toward the bottom surface 101c of the battery can 101 along the 101a and a joining flat portion 193 connected by an inclined portion 195 provided at the lower end of the flat plate 192 are provided. The seat surface portion 191 is provided with a through hole 194 to which the negative electrode connection terminal 155 is attached.

図2に示すように、正極集電体180は、電池蓋102の内面に沿う座面部181と、座面部181の長辺両側部から略直角に曲がって、電池缶101の幅広面101aに沿いながら電池缶101の底面101cに向かって延在する平面板182と、平面板182の下端に設けた傾斜部185により接続される接合平面部183とを備えている。座面部181には、正極接続端子145が取り付けられる貫通孔(不図示)が設けられている。   As shown in FIG. 2, the positive electrode current collector 180 includes a seat surface portion 181 along the inner surface of the battery lid 102 and a substantially right angle from both sides of the long side of the seat surface portion 181, along the wide surface 101 a of the battery can 101. However, a flat plate 182 extending toward the bottom surface 101c of the battery can 101 and a bonding flat portion 183 connected by an inclined portion 185 provided at the lower end of the flat plate 182 are provided. The seat surface portion 181 is provided with a through hole (not shown) to which the positive electrode connection terminal 145 is attached.

図4に示すように、負極接続端子155は、上記した電池蓋102の貫通孔124、負極用端子台160nの貫通孔164nおよび負極外部端子板151の貫通孔153hを貫通する平面視円形状の貫通部156と、貫通部156の一端部に設けられる平面視円形状のフランジ157と、フランジ157から捲回電極群170側に向かって突設された円筒状の突部(不図示)とを備えている。   As shown in FIG. 4, the negative electrode connection terminal 155 has a circular shape in a plan view that penetrates the through hole 124 of the battery lid 102, the through hole 164n of the negative electrode terminal block 160n, and the through hole 153h of the negative electrode external terminal plate 151. A penetrating portion 156, a flange 157 having a circular shape in plan view provided at one end of the penetrating portion 156, and a cylindrical projecting portion (not shown) projecting from the flange 157 toward the wound electrode group 170 side. I have.

同様に、正極接続端子145は、上記した電池蓋102の貫通孔124、正極用端子台160pの貫通孔164pおよび正極外部端子板141の貫通孔143hを貫通する平面視円形状の貫通部146と、貫通部146の一端部に設けられる平面視円形状のフランジ147と、フランジ147から捲回電極群170側に向かって突設された円筒状の突部(不図示)とを備えている。   Similarly, the positive electrode connection terminal 145 includes a through-hole 146 having a circular shape in plan view that penetrates the through-hole 124 of the battery lid 102, the through-hole 164p of the positive electrode terminal block 160p, and the through-hole 143h of the positive electrode external terminal plate 141. And a flange 147 having a circular shape in plan view provided at one end of the penetrating portion 146, and a cylindrical protrusion (not shown) protruding from the flange 147 toward the wound electrode group 170 side.

図4に示すように、負極接続端子155の貫通部156は、フランジ157から上方に向かって突設される基端側貫通部156bと、基端側貫通部156bの上端から上方に向かって突設される先端側貫通部156aとを有している。先端側貫通部156aの外径は、基端側貫通部156bの外径よりも小さく、先端側貫通部156aの上部は円筒状とされている。   As shown in FIG. 4, the through hole 156 of the negative electrode connection terminal 155 protrudes upward from the upper end of the base end side through portion 156b and the base end side through portion 156b protruding upward from the flange 157. And a leading end side through portion 156a. The outer diameter of the distal end side penetration portion 156a is smaller than the outer diameter of the proximal end side penetration portion 156b, and the upper portion of the distal end side penetration portion 156a is cylindrical.

同様に、正極接続端子145の貫通部146は、フランジ147から上方に向かって突設される基端側貫通部146bと、基端側貫通部146bの上端から上方に向かって突設される先端側貫通部146aとを有している。先端側貫通部146aの外径は、基端側貫通部146bの外径よりも小さく、先端側貫通部146aの上部は円筒状とされている。   Similarly, the penetration part 146 of the positive electrode connection terminal 145 has a proximal end side penetration part 146b projecting upward from the flange 147 and a distal end projecting upward from the upper end of the proximal end side penetration part 146b. And a side through portion 146a. The outer diameter of the distal end side penetration portion 146a is smaller than the outer diameter of the proximal end side penetration portion 146b, and the upper portion of the distal end side penetration portion 146a is cylindrical.

図5(a)は電池蓋102に取り付けられた負極端子部材105を示す平面図であり、図5(b)は電池蓋102に取り付けられた正極端子部材104を示す平面図である。図5(a)では、錫メッキ層120を模式的にハッチングで示している。図6(a)は図5(a)のA−A線切断断面図であり、図6(b)は図5(b)のB−B線切断断面図である。   FIG. 5A is a plan view showing the negative electrode terminal member 105 attached to the battery lid 102, and FIG. 5B is a plan view showing the positive electrode terminal member 104 attached to the battery lid 102. In FIG. 5A, the tin plating layer 120 is schematically shown by hatching. 6A is a cross-sectional view taken along line AA in FIG. 5A, and FIG. 6B is a cross-sectional view taken along line BB in FIG. 5B.

図5(a)および図6(a)に示すように、負極外部端子板151の端子取付部153の上表面には錫メッキ処理が施され、錫メッキ層120が形成されている。錫からなる錫メッキ層120は、銅からなる負極外部端子板151よりも硬度が低く、かつ、レーザ吸収率が高い。なお、図5(b)および図6(b)に示すように、正極外部端子板141の上表面には錫メッキ処理が施されておらず、錫メッキ層は形成されていない。   As shown in FIGS. 5A and 6A, the upper surface of the terminal attachment portion 153 of the negative external terminal plate 151 is subjected to a tin plating process, and a tin plating layer 120 is formed. The tin plating layer 120 made of tin has a lower hardness and a higher laser absorption rate than the negative electrode external terminal plate 151 made of copper. In addition, as shown in FIG.5 (b) and FIG.6 (b), the tin plating process is not performed to the upper surface of the positive electrode external terminal board 141, and the tin plating layer is not formed.

図6(a)に示すように、負極接続端子155の下端部に設けられる円筒状の突部158の先端は、突部158が負極集電体190の座面部191に形成された貫通孔194に挿通され、フランジ157が座面部191に当接された状態で座面部191にカシメられる。その結果、座面部191は負極カシメ部158sとフランジ157とによって挟持されている。   As shown in FIG. 6A, the tip of the cylindrical protrusion 158 provided at the lower end of the negative electrode connection terminal 155 has a through hole 194 in which the protrusion 158 is formed in the seat surface portion 191 of the negative electrode current collector 190. And the flange 157 is crimped to the seating surface portion 191 in a state where the flange 157 is in contact with the seating surface portion 191. As a result, the seat surface portion 191 is sandwiched between the negative electrode caulking portion 158s and the flange 157.

同様に、図6(b)に示すように、正極接続端子145の下端部に設けられる円筒状の突部148の先端は、突部148が正極集電体180の座面部181に形成された貫通孔184に挿通され、フランジ147が座面部181に当接された状態で座面部181にカシメられる。その結果、座面部181は正極カシメ部148sとフランジ147とによって挟持されている。   Similarly, as shown in FIG. 6B, the protrusion 148 is formed on the seating surface portion 181 of the positive electrode current collector 180 at the tip of the cylindrical protrusion 148 provided at the lower end of the positive electrode connection terminal 145. It is inserted into the through hole 184 and is caulked to the seat surface portion 181 in a state where the flange 147 is in contact with the seat surface portion 181. As a result, the seat surface portion 181 is sandwiched between the positive crimping portion 148s and the flange 147.

図6(a)に示すように、負極接続端子155の貫通部156は、負極用ガスケット109nが基端側貫通部156bに装着された状態で、電池蓋102の貫通孔124、負極用端子台160nの貫通孔164nおよび負極外部端子板151の貫通孔153hに挿通される。フランジ157と電池蓋102の内面とで負極用ガスケット109nの鍔部が挟まれた後、先端側貫通部156aの円筒状部分の先端が負極外部端子板151の端子取付部153に施された錫メッキ層120にカシメられる。先端側貫通部156aの円筒状部分がカシメられ、拡径されると、錫メッキ層120に密着する負極カシメ部156sが形成される。その結果、図6(a)に示すように、負極外部端子板151、負極用端子台160n、電池蓋102および負極用ガスケット109nの鍔部は、負極カシメ部156sとフランジ157とによって挟持される。   As shown in FIG. 6A, the through-hole 156 of the negative electrode connection terminal 155 has the through-hole 124 of the battery lid 102, the negative-electrode terminal block, with the negative-electrode gasket 109n attached to the proximal-side through-hole 156b. The through hole 164n of 160n and the through hole 153h of the negative external terminal plate 151 are inserted. After the flange of the negative electrode gasket 109n is sandwiched between the flange 157 and the inner surface of the battery lid 102, the tip of the cylindrical portion of the tip side through portion 156a is tin applied to the terminal mounting portion 153 of the negative electrode external terminal plate 151. The plating layer 120 is crimped. When the cylindrical portion of the distal end side penetrating portion 156a is crimped and expanded in diameter, a negative electrode crimping portion 156s that is in close contact with the tin plating layer 120 is formed. As a result, as shown in FIG. 6A, the flanges of the negative electrode external terminal plate 151, the negative electrode terminal block 160n, the battery lid 102, and the negative electrode gasket 109n are sandwiched between the negative electrode caulking portion 156s and the flange 157. .

図6(b)に示すように、正極接続端子145の貫通部146は、正極用ガスケット109pが基端側貫通部146bに装着された状態で、電池蓋102の貫通孔124、正極用端子台160pの貫通孔164pおよび正極外部端子板141の貫通孔143hに挿通される。フランジ147と電池蓋102の内面とで正極用ガスケット109pの鍔部が挟まれた後、先端側貫通部146aの円筒状部分の先端が正極外部端子板141の端子取付部143にカシメられる。先端側貫通部146aの円筒状部分がカシメられ、拡径されると、正極外部端子板141に密着する正極カシメ部146sが形成される。その結果、図6(b)に示すように、正極外部端子板141、正極用端子台160p、電池蓋102および正極用ガスケット109pの鍔部は、正極カシメ部146sとフランジ147とによって挟持される。   As shown in FIG. 6 (b), the through hole 146 of the positive electrode connection terminal 145 has the through hole 124 of the battery lid 102, the positive electrode terminal block with the positive electrode gasket 109p attached to the base end side through hole 146b. The through hole 164p of 160p and the through hole 143h of the positive external terminal plate 141 are inserted. After the flange portion of the positive electrode gasket 109p is sandwiched between the flange 147 and the inner surface of the battery lid 102, the tip of the cylindrical portion of the tip side through portion 146a is crimped to the terminal mounting portion 143 of the positive electrode external terminal plate 141. When the cylindrical portion of the distal end side through portion 146a is crimped and expanded in diameter, a positive crimping portion 146s that is in close contact with the positive electrode external terminal plate 141 is formed. As a result, as shown in FIG. 6B, the flanges of the positive external terminal plate 141, the positive terminal block 160p, the battery lid 102, and the positive gasket 109p are sandwiched between the positive caulking portion 146s and the flange 147. .

図5(a)および図6(a)に示すように、平面視円形状の負極カシメ部156sの外縁部は負極外部端子板151に隅肉レーザ溶接され、溶接部(溶接金属)130nが形成されている。溶接部130nは、端子取付部153に施された錫メッキ層120の4隅に対応して、負極カシメ部156sの外縁部において周方向に等間隔となるように4カ所形成されている。溶接部130nは、負極外部端子板151と負極接続端子155との間の導通経路を構成している。   As shown in FIGS. 5 (a) and 6 (a), the outer edge portion of the negative electrode caulking portion 156s having a circular shape in plan view is welded to the negative electrode external terminal plate 151 by fillet laser to form a welded portion (welded metal) 130n. Has been. Four welds 130n are formed at equal intervals in the circumferential direction at the outer edge of the negative caulking portion 156s corresponding to the four corners of the tin plating layer 120 applied to the terminal mounting portion 153. The welded portion 130n constitutes a conduction path between the negative electrode external terminal plate 151 and the negative electrode connection terminal 155.

図5(b)および図6(b)に示すように、平面視円形状の正極カシメ部146sの外縁部は正極外部端子板141に隅肉レーザ溶接され、溶接部(溶接金属)130pが形成されている。溶接部130pは、端子取付部143の4隅に対応して、正極カシメ部146sの外縁部において周方向に等間隔となるように4カ所形成されている。溶接部130pは、正極外部端子板141と正極接続端子145との間の導通経路を構成している。   As shown in FIGS. 5 (b) and 6 (b), the outer edge of the positive caulking portion 146s having a circular shape in plan view is welded to the positive external terminal plate 141 by fillet laser welding to form a welded portion (welded metal) 130p. Has been. Four welding portions 130p are formed at equal intervals in the circumferential direction at the outer edge portion of the positive crimping portion 146s corresponding to the four corners of the terminal attachment portion 143. The welded portion 130p constitutes a conduction path between the positive external terminal plate 141 and the positive connection terminal 145.

このように、本実施の形態では、負極接続端子155の負極カシメ部156sの外縁部の全周に亘って溶接されているのではなく、断続溶接されている(図5(a)参照)。同様に、正極接続端子145の正極カシメ部146sの外縁部の全周に亘って溶接されているのではなく、断続溶接されている(図5(b)参照)。   Thus, in this embodiment, the welding is not performed over the entire circumference of the outer edge portion of the negative electrode caulking portion 156s of the negative electrode connection terminal 155, but is intermittently welded (see FIG. 5A). Similarly, it is not welded over the entire periphery of the outer edge portion of the positive electrode caulking portion 146s of the positive electrode connection terminal 145, but is intermittently welded (see FIG. 5B).

上述のように、負極接続端子155は、負極接続端子155の下端が負極集電体190にカシメられ(図6(a)参照)、負極接続端子155の上端が錫メッキ層120を介して負極外部端子板151にカシメられ、さらにレーザ溶接されている(図5(a)および図6(a)参照)。正極接続端子145は、正極接続端子145の下端が正極集電体180にカシメられ(図6(b)参照)、正極接続端子145の上端が正極外部端子板141にカシメられ、さらにレーザ溶接されている(図5(b)および図6(b)参照)。これにより、負極集電体190と負極外部端子板151とが電気的に接続され、正極集電体180と正極外部端子板141とが電気的に接続される。   As described above, the negative electrode connection terminal 155 has the lower end of the negative electrode connection terminal 155 caulked to the negative electrode current collector 190 (see FIG. 6A), and the upper end of the negative electrode connection terminal 155 is negative through the tin plating layer 120. It is crimped to the external terminal plate 151 and further laser-welded (see FIGS. 5A and 6A). The positive electrode connection terminal 145 has the lower end of the positive electrode connection terminal 145 crimped to the positive electrode current collector 180 (see FIG. 6B), the upper end of the positive electrode connection terminal 145 crimped to the positive electrode external terminal plate 141, and further laser welded. (See FIG. 5B and FIG. 6B). Thereby, the negative electrode current collector 190 and the negative electrode external terminal plate 151 are electrically connected, and the positive electrode current collector 180 and the positive electrode external terminal plate 141 are electrically connected.

図6(a)に示すように、レーザ光131は、負極接続端子155の斜め上方から負極カシメ部156sの外縁部の側面と負極外部端子板151に形成された錫メッキ層120の上面との境界に向けて照射される。図6(b)に示すように、レーザ光131は、正極接続端子145の斜め上方から正極カシメ部146sの外縁部の側面と正極外部端子板141の上面との境界に向けて照射される。レーザ光131は集光レンズ(不図示)によって照射領域(照射スポット)が所定の大きさとなるように集光される。   As shown in FIG. 6A, the laser beam 131 is formed between the side surface of the outer edge portion of the negative electrode caulking portion 156s and the upper surface of the tin plating layer 120 formed on the negative electrode external terminal plate 151 from obliquely above the negative electrode connection terminal 155. Irradiate towards the boundary. As shown in FIG. 6B, the laser beam 131 is irradiated from an obliquely upper side of the positive electrode connection terminal 145 toward the boundary between the side surface of the outer edge portion of the positive electrode caulking portion 146 s and the upper surface of the positive electrode external terminal plate 141. The laser beam 131 is condensed by a condenser lens (not shown) so that an irradiation area (irradiation spot) has a predetermined size.

純粋な電気自動車やプラグインハイブリッド電気自動車のように大きな出力が要求される二次電池では、二次電池に大電流が流れることになる。このため、接続端子や外部端子板などの導電部材間の接続抵抗は低いことが望ましい。本実施の形態では、負極外部端子板151の表面に錫メッキ層120を形成し、錫メッキ層120に負極カシメ部156sを密着させている。錫メッキ層120のビッカース硬度は3〜8程度であり、負極外部端子板151および負極接続端子155のビッカース硬度は45〜75程度である。このため、本実施の形態によれば、負極外部端子板151に直接に負極接続端子155をカシメ固定する場合に比べて、導電部材間の密着性の向上により接続抵抗の低減を図ることができる。   In a secondary battery that requires a large output, such as a pure electric vehicle or a plug-in hybrid electric vehicle, a large current flows through the secondary battery. For this reason, it is desirable that the connection resistance between conductive members such as connection terminals and external terminal plates be low. In the present embodiment, the tin plating layer 120 is formed on the surface of the negative electrode external terminal plate 151, and the negative electrode caulking portion 156 s is in close contact with the tin plating layer 120. The Vickers hardness of the tin plating layer 120 is about 3 to 8, and the Vickers hardness of the negative electrode external terminal plate 151 and the negative electrode connection terminal 155 is about 45 to 75. For this reason, according to this Embodiment, compared with the case where the negative electrode connection terminal 155 is caulked and fixed directly to the negative electrode external terminal plate 151, connection resistance can be reduced by improving the adhesiveness between conductive members. .

以下、負極外部端子板151に直接に負極接続端子155をカシメ固定する例を比較例とし、本実施の形態における負極カシメ部156sの密着性について比較例と比較して説明する。図7(a)は、本実施の形態に係る二次電池100において、負極カシメ部156sと錫メッキ層120との密着性を説明する図であり、図6(a)のC部を拡大した図に相当する。図7(b)および図7(c)は、比較例に係る二次電池において、負極カシメ部956sと負極外部端子板951との密着性を説明する図である。負極外部端子板151,951の上面は平坦な面となるように加工されるが、図7に示すように、加工精度により反りやうねりが生じている。なお、図7では、便宜上、負極外部端子板151,951の表面の反りやうねりの大きさを誇張して図示している。   Hereinafter, an example in which the negative electrode connection terminal 155 is caulked and fixed directly to the negative electrode external terminal plate 151 will be described as a comparative example, and the adhesiveness of the negative electrode caulking portion 156s in the present embodiment will be described in comparison with the comparative example. FIG. 7A is a diagram for explaining the adhesion between the negative electrode caulking portion 156s and the tin plating layer 120 in the secondary battery 100 according to the present embodiment, and enlarges the C portion of FIG. 6A. It corresponds to the figure. FIGS. 7B and 7C are diagrams illustrating the adhesion between the negative crimping portion 956s and the negative external terminal plate 951 in the secondary battery according to the comparative example. Although the upper surfaces of the negative electrode external terminal plates 151 and 951 are processed to be flat surfaces, as shown in FIG. 7, warping and undulation are caused by the processing accuracy. In FIG. 7, for the sake of convenience, the surface warpage and undulation of the negative electrode external terminal plates 151 and 951 are exaggerated.

比較例では、負極外部端子板951に直接に負極接続端子955がカシメられているため、図7(b)および図7(c)に示すように、負極カシメ部956sと負極外部端子板951とが当接する部分や、負極カシメ部956sと負極外部端子板951との間に隙間956iが形成されてしまう部分が生じる。   In the comparative example, since the negative electrode connection terminal 955 is directly crimped to the negative electrode external terminal plate 951, as shown in FIGS. 7B and 7C, the negative crimping portion 956s, the negative electrode external terminal plate 951, And a portion where a gap 956i is formed between the negative caulking portion 956s and the negative external terminal plate 951 are generated.

これに対して、図7(a)に示すように、本実施の形態に係る二次電池100では、負極接続端子155が錫メッキ層120を介して負極外部端子板151にカシメられている。錫メッキ層120は、負極外部端子板151や負極接続端子155の材質に比べて、硬度の低い錫によって形成されている。このため、負極接続端子155がカシメられると、図7(a)に示すように、負極カシメ部156sによって錫メッキ層120が圧縮され、錫メッキ層120と負極カシメ部156sとが密着し、隙間の形成が防止される。つまり、本実施の形態によれば、比較例に比べて密着性が向上しており、導電部材間の接続抵抗が低減されている。   On the other hand, as shown in FIG. 7A, in the secondary battery 100 according to the present embodiment, the negative electrode connection terminal 155 is caulked to the negative electrode external terminal plate 151 via the tin plating layer 120. The tin plating layer 120 is made of tin having a lower hardness than the material of the negative electrode external terminal plate 151 and the negative electrode connection terminal 155. For this reason, when the negative electrode connection terminal 155 is crimped, as shown in FIG. 7A, the tin plating layer 120 is compressed by the negative electrode crimping portion 156s, and the tin plating layer 120 and the negative electrode crimping portion 156s are in close contact with each other. Is prevented from forming. That is, according to the present embodiment, the adhesion is improved as compared with the comparative example, and the connection resistance between the conductive members is reduced.

さらに、本実施の形態では、導電部材同士の密着性が向上しているため、レーザ溶接の際、断続溶接部の断面形状および溶け込み深さを周方向に亘って均等にすることができる。これに対して、比較例では、図7(b)および図7(c)に示すように、負極カシメ部956sと負極外部端子板951とが当接する部分や、負極カシメ部956sと負極外部端子板951との間に隙間956iが形成される部分がある。   Furthermore, in this Embodiment, since the adhesiveness of electrically-conductive members is improving, the cross-sectional shape and penetration depth of an intermittent welding part can be equalized over the circumferential direction in the case of laser welding. On the other hand, in the comparative example, as shown in FIG. 7B and FIG. 7C, the portion where the negative electrode crimping portion 956s and the negative electrode external terminal plate 951 are in contact, or the negative electrode crimping portion 956s and the negative electrode external terminal There is a portion where a gap 956i is formed between the plate 951 and the plate 951.

このため、比較例において、負極カシメ部956sと負極外部端子板951とが当接している部分を溶接することを基準として、レーザ出力、レーザ照射時間等のレーザ溶接条件を決定し、負極接続端子955の周方向に沿って断続溶接すると、隙間956iが形成されている部分にレーザを照射しても負極接続端子955および負極外部端子板951を充分に溶融させることができないおそれがある。   For this reason, in the comparative example, laser welding conditions such as laser output and laser irradiation time are determined based on welding the portion where the negative electrode crimping portion 956s and the negative electrode external terminal plate 951 are in contact with each other. If intermittent welding is performed along the circumferential direction 955, the negative electrode connection terminal 955 and the negative electrode external terminal plate 951 may not be sufficiently melted even if a laser is applied to the portion where the gap 956i is formed.

比較例において、負極カシメ部956sと負極外部端子板951との間に隙間956iが形成されている部分を基準として、レーザ溶接条件を決定し、負極接続端子955の周方向に沿って断続溶接すると、負極カシメ部956sと負極外部端子板951とが当接している部分に過剰にレーザが照射されることになり、レーザ溶接の効率が悪くなるおそれがある。さらに、隙間956iにレーザが照射されると、隙間956iを塞ぐように溶融した金属が流れ、凝固時の引張応力により割れ等の溶接欠陥が生じるおそれもある。   In the comparative example, laser welding conditions are determined with reference to a portion where a gap 956i is formed between the negative crimping portion 956s and the negative external terminal plate 951, and intermittent welding is performed along the circumferential direction of the negative connection terminal 955. The laser is excessively applied to the portion where the negative electrode crimping portion 956s and the negative electrode external terminal plate 951 are in contact with each other, and the efficiency of laser welding may be deteriorated. Further, when the gap 956i is irradiated with laser, the molten metal flows so as to close the gap 956i, and there is a possibility that a welding defect such as a crack may occur due to a tensile stress during solidification.

これに対して、本実施の形態では、レーザ照射部分に隙間がないため、部分的に過剰にレーザが照射されて、溶け込みが深くなってしまったり、部分的にレーザの照射量が不足して、溶け込みが不十分となってしまったりすることがない。つまり、本実施の形態では、断続溶接部の断面形状および溶け込み深さを周方向に亘って略均等にすることができる。   On the other hand, in this embodiment, since there is no gap in the laser irradiation portion, the laser is partially irradiated excessively, the penetration becomes deep, or the laser irradiation amount is partially insufficient. , The melting does not become insufficient. That is, in this Embodiment, the cross-sectional shape and penetration depth of an intermittent welding part can be made substantially equal over the circumferential direction.

さらに、本実施の形態において、負極外部端子板151の表面に形成される錫メッキ層120の材質である錫は、溶接に用いられるYAGレーザに対する光吸収率が負極外部端子板151および負極接続端子155の材質である銅よりも高い。このため、レーザ光の反射を防ぎ、レーザ光の吸収を安定させることができる。   Further, in the present embodiment, tin, which is a material of the tin plating layer 120 formed on the surface of the negative electrode external terminal plate 151, has a light absorptivity with respect to the YAG laser used for welding and the negative electrode external terminal plate 151 and the negative electrode connection terminal. It is higher than copper which is a material of 155. For this reason, reflection of a laser beam can be prevented and absorption of a laser beam can be stabilized.

比較例に係る二次電池は、錫メッキ層が形成されていない。負極外部端子板151の材質である銅は、YAGレーザに対する光吸収率が錫よりも低く、照射されるレーザ光の多くが反射してしまう。反射率の高い負極外部端子板951と負極接続端子955とを断続溶接すると、必要な溶け込み深さが得られる部分と、そうでない部分とが形成され、周方向に沿って一定の溶け込み深さを得ることが難しい。光吸収率の低い部材同士のレーザ溶接は、溶け込み深さの制御が難しいため、部分的に負極用端子台160nへの熱影響が大きくなり、負極用端子台160nが変形してしまうおそれがある。   In the secondary battery according to the comparative example, the tin plating layer is not formed. Copper, which is the material of the negative external terminal plate 151, has a lower light absorption rate with respect to the YAG laser than tin, and much of the irradiated laser light is reflected. When the negative electrode external terminal plate 951 and the negative electrode connection terminal 955 having high reflectivity are intermittently welded, a portion where the necessary penetration depth is obtained and a portion where the penetration depth is not obtained are formed, and a constant penetration depth is formed along the circumferential direction. Difficult to get. In laser welding of members having low light absorptance, it is difficult to control the penetration depth, so that the thermal effect on the negative electrode terminal block 160n is partially increased, and the negative electrode terminal block 160n may be deformed. .

これに対して、本実施の形態では、光吸収率の高い錫メッキ層120が負極外部端子板151の表面に形成されているので、錫メッキ層120にレーザ光の多くを吸収させて、レーザ光を効率よく熱エネルギーに変換することができる。また、レーザ溶接の制御が容易にできるため、必要な溶け込み深さを容易に得ることができる。   On the other hand, in the present embodiment, since the tin plating layer 120 having a high light absorption rate is formed on the surface of the negative electrode external terminal plate 151, the tin plating layer 120 absorbs most of the laser light, and laser Light can be efficiently converted into thermal energy. In addition, since laser welding can be easily controlled, the necessary penetration depth can be easily obtained.

上述した本実施の形態によれば、以下のような作用効果を奏することができる。
(1)本実施の形態に係る二次電池100では、負極外部端子板151の表面に、負極外部端子板151の材質である銅よりも硬度の低い錫からなる錫メッキ層120が形成されている。負極接続端子155は、錫メッキ層120を介して負極外部端子板151にカシメられている。これにより、負極カシメ部156sを錫メッキ層120に良好に密着させることができる。その結果、負極端子部材105を構成する導電部材間の接続抵抗を低減させることができる。
According to this embodiment described above, the following operational effects can be achieved.
(1) In secondary battery 100 according to the present embodiment, tin plating layer 120 made of tin having a lower hardness than copper, which is the material of negative electrode external terminal plate 151, is formed on the surface of negative electrode external terminal plate 151. Yes. The negative electrode connection terminal 155 is caulked to the negative electrode external terminal plate 151 via the tin plating layer 120. Thereby, the negative electrode caulking portion 156s can be satisfactorily adhered to the tin plating layer 120. As a result, the connection resistance between the conductive members constituting the negative electrode terminal member 105 can be reduced.

(2)負極カシメ部156sは、負極カシメ部156sの外縁に沿って、レーザにより錫メッキ層120を介して負極外部端子板151に断続溶接されている。負極カシメ部156sと錫メッキ層120とは良好に密着しているため、レーザ溶接の際、断続溶接部の溶け込み深さを周方向に亘って均等にすることができる。その結果、負極端子部材105を構成する導電部材間の接続抵抗を低減させることができる。   (2) The negative electrode crimping portion 156s is intermittently welded to the negative electrode external terminal plate 151 via the tin plating layer 120 by a laser along the outer edge of the negative electrode crimping portion 156s. Since the negative electrode caulking portion 156s and the tin plating layer 120 are in close contact with each other, the penetration depth of the intermittent weld portion can be made uniform in the circumferential direction during laser welding. As a result, the connection resistance between the conductive members constituting the negative electrode terminal member 105 can be reduced.

(3)負極外部端子板151の表面に形成される錫メッキ層120は、負極外部端子板151の銅よりもレーザ光の吸収率の高い錫からなる。これにより、錫メッキ層120にレーザ光の多くを吸収させて、レーザ光を効率よく熱エネルギーに変換することができる。また、レーザ溶接の制御が容易にできるため、必要な溶け込み深さを容易に得ることができる。   (3) The tin plating layer 120 formed on the surface of the negative electrode external terminal plate 151 is made of tin having a higher laser light absorption rate than copper of the negative electrode external terminal plate 151. Thereby, most of the laser beam can be absorbed by the tin plating layer 120, and the laser beam can be efficiently converted into thermal energy. In addition, since laser welding can be easily controlled, the necessary penetration depth can be easily obtained.

なお、次のような変形も本発明の範囲内であり、変形例の一つ、もしくは複数を上述の実施形態と組み合わせることも可能である。
[変形例]
(1)上記した実施の形態では、負極外部端子板151の表面に形成される金属メッキ層として、錫メッキ層120を採用したが、本発明はこれに限定されない。少なくとも、負極外部端子板151の材質よりも硬度の低い材質からなる金属メッキ層を負極外部端子板151に形成すればよく、たとえば、錫メッキ層120に代えて、亜鉛メッキ層を負極外部端子板151の表面に形成してもよい。
The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.
[Modification]
(1) In the above embodiment, the tin plating layer 120 is employed as the metal plating layer formed on the surface of the negative electrode external terminal plate 151, but the present invention is not limited to this. A metal plating layer made of a material having a hardness lower than that of the negative electrode external terminal plate 151 may be formed on the negative electrode external terminal plate 151. For example, instead of the tin plating layer 120, a zinc plating layer may be used as the negative electrode external terminal plate. 151 may be formed on the surface.

(2)上記した実施の形態では、図8(a)に示すように、負極外部端子板151の端子取付部153の上表面に錫メッキ層120を形成し、バスバー当接部152には錫メッキ層120を形成しないようにしたが、本発明はこれに限定されない。たとえば、図8(b)に示すように、負極外部端子板151の上表面全体に錫メッキ層220を形成してもよい。少なくとも、負極接続端子155の負極カシメ部158sと負極外部端子板151との間に錫メッキ層が介在するように、負極外部端子板151の表面に錫メッキ層を形成すればよく、図8(c)に示すように、貫通孔153hの周囲にのみ錫メッキ層320を形成してもよい。   (2) In the above-described embodiment, as shown in FIG. 8A, the tin plating layer 120 is formed on the upper surface of the terminal attaching portion 153 of the negative electrode external terminal plate 151, and the bus bar abutting portion 152 has tin. Although the plating layer 120 is not formed, the present invention is not limited to this. For example, as shown in FIG. 8B, a tin plating layer 220 may be formed on the entire upper surface of the negative external terminal plate 151. The tin plating layer may be formed on the surface of the negative electrode external terminal plate 151 so that at least the tin plating layer is interposed between the negative electrode caulking portion 158s of the negative electrode connection terminal 155 and the negative electrode external terminal plate 151. FIG. As shown in c), the tin plating layer 320 may be formed only around the through hole 153h.

(3)負極外部端子板151、負極接続端子155、負極集電体190および負極箔172の材質は、銅に限定されることなく、銅合金としてもよい。負極外部端子板151、負極接続端子155、負極集電体190および負極箔172のそれぞれの材質を、同一にする場合に限られることもなく、同種の材質であれば、各部材で異なる特性の材質を採用することもできる。たとえば、負極外部端子板151を銅により形成し、負極接続端子155を銅合金により形成してもよい。正極外部端子板141、正極接続端子145、正極集電体180および正極箔171の材質は、アルミニウムに限定されることなく、アルミニウム合金としてもよい。正極外部端子板141、正極接続端子145、正極集電体180および正極箔171のそれぞれの材質を、同一にする場合に限られることもなく、同種の材質であれば、各部材で異なる特性の材質を採用することもできる。たとえば、正極外部端子板141をアルミニウムにより形成し、正極接続端子145をアルミニウム合金により形成してもよい。   (3) The material of the negative electrode external terminal plate 151, the negative electrode connection terminal 155, the negative electrode current collector 190, and the negative electrode foil 172 is not limited to copper, and may be a copper alloy. Each material of the negative electrode external terminal plate 151, the negative electrode connection terminal 155, the negative electrode current collector 190, and the negative electrode foil 172 is not limited to the same material. A material can also be adopted. For example, the negative external terminal plate 151 may be formed of copper, and the negative connection terminal 155 may be formed of a copper alloy. The material of the positive electrode external terminal plate 141, the positive electrode connection terminal 145, the positive electrode current collector 180, and the positive electrode foil 171 is not limited to aluminum, and may be an aluminum alloy. Each material of the positive electrode external terminal plate 141, the positive electrode connection terminal 145, the positive electrode current collector 180, and the positive electrode foil 171 is not limited to the same material. A material can also be adopted. For example, the positive external terminal plate 141 may be formed of aluminum, and the positive connection terminal 145 may be formed of an aluminum alloy.

(4)正極端子部材104および負極端子部材105の構成は、上記した実施の形態に限定されない。たとえば、正極接続端子145と正極外部端子板141とは、一体成形するようにしてもよい。少なくとも、負極端子部材105を構成する負極接続端子155が金属メッキ層を介して負極外部端子板151にカシメられていればよい。   (4) The configuration of the positive electrode terminal member 104 and the negative electrode terminal member 105 is not limited to the above-described embodiment. For example, the positive electrode connection terminal 145 and the positive electrode external terminal plate 141 may be integrally formed. It is sufficient that at least the negative electrode connection terminal 155 constituting the negative electrode terminal member 105 is caulked to the negative electrode external terminal plate 151 via the metal plating layer.

(5)上記した実施の形態では、正極接続端子145と正極外部端子板141とをレーザ溶接により接続し、負極接続端子155と負極外部端子板151とをレーザ溶接により接続したが、本発明はこれに限定されない。電子ビーム溶接により、正極接続端子145と正極外部端子板141とを接続し、負極接続端子155と負極外部端子板151とを接続してもよい。   (5) In the above embodiment, the positive electrode connection terminal 145 and the positive electrode external terminal plate 141 are connected by laser welding, and the negative electrode connection terminal 155 and the negative electrode external terminal plate 151 are connected by laser welding. It is not limited to this. The positive electrode connection terminal 145 and the positive electrode external terminal plate 141 may be connected by electron beam welding, and the negative electrode connection terminal 155 and the negative electrode external terminal plate 151 may be connected.

(6)上記した実施の形態では、正極端子部材104の正極ボルト部材149および負極端子部材105の負極ボルト部材159のそれぞれにナットを締め付けることで、バスバーを取り付けることができる構造について説明したが、本発明はこれに限定されない。たとえば、ボルト部材を省略し、正極外部端子板のバスバー当接部および負極外部端子板のバスバー当接部にバスバーを当接し、レーザ溶接や電子ビーム溶接などによりバスバーを正極外部端子板および負極外部端子板に接続してもよい。   (6) In the above-described embodiment, the structure in which the bus bar can be attached by tightening the nut to each of the positive electrode bolt member 149 of the positive electrode terminal member 104 and the negative electrode bolt member 159 of the negative electrode terminal member 105 has been described. The present invention is not limited to this. For example, the bolt member is omitted, the bus bar is brought into contact with the bus bar contact portion of the positive external terminal plate and the bus bar contact portion of the negative external terminal plate, and the bus bar is connected to the positive external terminal plate and the negative external portion by laser welding or electron beam welding. You may connect to a terminal board.

(7)上記した実施の形態では、正極接続端子145が座面部181にカシメ固定され、負極接続端子155が座面部191にカシメ固定されているものについて説明したが、本発明はこれに限定されない。レーザ溶接や電子ビーム溶接などにより正極接続端子145と正極集電体180とを接続し、負極接続端子155と負極集電体190とを接続してもよい。   (7) In the above-described embodiment, the positive electrode connection terminal 145 is fixed to the seat surface portion 181 and the negative electrode connection terminal 155 is fixed to the seat surface portion 191. However, the present invention is not limited to this. . The positive electrode connection terminal 145 and the positive electrode current collector 180 may be connected by laser welding or electron beam welding, and the negative electrode connection terminal 155 and the negative electrode current collector 190 may be connected.

(8)上記した実施の形態では、電池容器の形状を角形としたが、本発明はこれに限定されない。断面長円形状の扁平形電池容器としてもよく、電池缶の開口を電池蓋によって封止する薄形の種々の電池容器を採用できる。   (8) In the above-described embodiment, the shape of the battery container is a square, but the present invention is not limited to this. A flat battery container having an oval cross section may be used, and various thin battery containers in which the opening of the battery can is sealed with a battery lid can be employed.

(9)リチウムイオン二次電池を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。   (9) Although the lithium ion secondary battery has been described as an example, the present invention can also be applied to other secondary batteries such as nickel metal hydride batteries.

(10)上記実施の形態では、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また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。上記実施の形態では、負極活物質に非晶質炭素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、脱離可能な天然黒鉛や、人造の各種黒鉛材、コークスなどの炭素質材料等を用いてもよい。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。   (10) In the above 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 in which a part is substituted or doped with a metal element Alternatively, lithium cobaltate or lithium titanate having a layered crystal structure, or a lithium-metal composite oxide obtained by substituting or doping a part thereof with a metal element may be used. In the above embodiment, the case where amorphous carbon is used as the negative electrode active material is exemplified, but the present invention is not limited to this, natural graphite capable of inserting and desorbing lithium ions, various artificial graphite materials, Carbonaceous materials such as coke may be used. The particle shape is not particularly limited, such as a scale shape, a spherical shape, a fiber shape, or a lump shape.

(11)上記実施の形態では、正負極活物質合剤の結着材として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合体などを用いることができる。   (11) In the above embodiment, the case where PVDF is used as the binder of the positive and negative electrode active material mixture is exemplified, but polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene butadiene It is possible to use polymers such as rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins, and mixtures thereof. it can.

(12)上記実施の形態では、負極接続端子155を錫メッキ層120を介して負極外部端子板151にカシメ固定した後、レーザ溶接することで、負極接続端子155と負極外部端子板151とを電気的に接続したが、本発明はこれに限定されない。レーザ溶接することなく、カシメ固定のみで負極接続端子155と負極外部端子板151とを電気的に接続する場合にも、密着性の向上により、接続抵抗を低減できる二次電池を提供することができる。   (12) In the above embodiment, the negative electrode connection terminal 155 and the negative electrode external terminal plate 151 are bonded by laser welding after the negative electrode connection terminal 155 is caulked and fixed to the negative electrode external terminal plate 151 via the tin plating layer 120. Although electrically connected, the present invention is not limited to this. To provide a secondary battery capable of reducing connection resistance by improving adhesion even when the negative electrode connection terminal 155 and the negative electrode external terminal plate 151 are electrically connected only by caulking without laser welding. it can.

本発明は、上記した実施の形態に限定されるものでなく、発明の要旨を逸脱しない範囲で自由に変更、改良が可能である。   The present invention is not limited to the embodiment described above, and can be freely changed and improved without departing from the gist of the invention.

100 二次電池、101 電池缶、101a 幅広面、101b 幅狭面、101c 底面、102 電池蓋、103 ガス排出弁、104 正極端子部材、105 負極端子部材、106a 注液孔、106b 注液栓、107 電池蓋組立体、109n 負極用ガスケット、109p 正極用ガスケット、120 錫メッキ層、122 凹部、124 貫通孔、130n 溶接部、130p 溶接部、131 レーザ光、141 正極外部端子板、142 バスバー当接部、142h ボルト挿通孔、143 端子取付部、143h 貫通孔、144 くびれ部、145 正極接続端子、146 貫通部、146a 先端側貫通部、146b 基端側貫通部、146s 正極カシメ部、147 フランジ、148 突部、148s 正極カシメ部、149 正極ボルト部材、149a 軸部、149b 頭部、151 負極外部端子板、152 バスバー当接部、152h ボルト挿通孔、153 端子取付部、153h 貫通孔、154 くびれ部、155 負極接続端子、156 貫通部、156a 先端側貫通部、156b 基端側貫通部、156s 負極カシメ部、157 フランジ、158 突部、158s 負極カシメ部、159 負極ボルト部材、159a 軸部、159b 頭部、160n 負極用端子台、160p 正極用端子台、161n ベース部、161p ベース部、162n,162p 凹部、163n,163p 側壁、164n,164p 貫通孔、165n,165p 嵌合凹部、170 捲回電極群、171 正極箔、172 負極箔、173a,173b セパレータ、174 正極電極、175 負極電極、176a 正極塗工部、176b 正極未塗工部、177a 負極塗工部、177b 負極未塗工部、180 正極集電体、181 座面部、182 平面板、183 接合平面部、184 貫通孔、185 傾斜部、190 負極集電体、191 座面部、192 平面板、193 接合平面部、194 貫通孔、195 傾斜部、951 負極外部端子板、955 負極接続端子、956i 隙間、956s 負極カシメ部   100 secondary battery, 101 battery can, 101a wide surface, 101b narrow surface, 101c bottom surface, 102 battery lid, 103 gas discharge valve, 104 positive electrode terminal member, 105 negative electrode terminal member, 106a injection hole, 106b injection plug, 107 Battery cover assembly, 109n negative electrode gasket, 109p positive electrode gasket, 120 tin plating layer, 122 recess, 124 through hole, 130n welded part, 130p welded part, 131 laser beam, 141 positive electrode external terminal plate, 142 bus bar contact Part, 142h bolt insertion hole, 143 terminal mounting part, 143h through hole, 144 constricted part, 145 positive electrode connection terminal, 146 through part, 146a distal end side through part, 146b proximal end through part, 146s positive electrode caulking part, 147 flange, 148 Projection, 148s Positive caulking part, 149 Positive electrode Bolt member, 149a shaft portion, 149b head, 151 negative electrode external terminal plate, 152 bus bar abutting portion, 152h bolt insertion hole, 153 terminal mounting portion, 153h through hole, 154 constricted portion, 155 negative electrode connecting terminal, 156 through portion, 156a Front end side penetration part, 156b Base end side penetration part, 156s Negative electrode caulking part, 157 Flange, 158 Projection part, 158s Negative electrode caulking part, 159 Negative electrode bolt member, 159a Shaft part, 159b Head part, 160n Negative electrode terminal block, 160p Positive terminal block, 161n base, 161p base, 162n, 162p recess, 163n, 163p side wall, 164n, 164p through hole, 165n, 165p fitting recess, 170 wound electrode group, 171 positive foil, 172 negative foil, 173a, 173b Separator, 174 Positive electrode Electrode, 175 Negative electrode, 176a Positive electrode coating portion, 176b Positive electrode uncoated portion, 177a Negative electrode coating portion, 177b Negative electrode uncoated portion, 180 Positive electrode current collector, 181 Seat surface portion, 182 Planar plate, 183 Bonding plane portion , 184 through-hole, 185 inclined portion, 190 negative electrode current collector, 191 seat surface portion, 192 plane plate, 193 bonding flat portion, 194 through-hole, 195 inclined portion, 951 negative electrode external terminal plate, 955 negative electrode connection terminal, 956i gap, 956s Negative electrode caulking part

Claims (3)

正極電極および負極電極をセパレータを介在させて捲回した捲回電極群と、
前記捲回電極群を収容する電池缶と、
前記電池缶を封止する電池蓋と、
前記電池蓋に取り付けられた正極端子部材および負極端子部材と、
前記正極電極と前記正極端子部材とを接続する正極集電体と、
前記負極電極と前記負極端子部材とを接続する負極集電体とを備え、
前記負極端子部材は、前記電池蓋上に絶縁部材を介して配置される負極外部端子板と、一端が前記負極集電体に接続され、他端が前記負極外部端子板にカシメられる負極接続端子とを有し、
前記負極外部端子板の材質は、銅または銅合金であって、
前記負極外部端子板の表面には、前記負極外部端子板の材質よりも硬度の低い材質からなる金属メッキ層が形成され、
前記負極接続端子は、前記金属メッキ層を介して前記負極外部端子板にカシメられていることを特徴とする二次電池。
A wound electrode group in which a positive electrode and a negative electrode are wound with a separator interposed therebetween;
A battery can containing the wound electrode group;
A battery lid for sealing the battery can;
A positive terminal member and a negative terminal member attached to the battery lid;
A positive electrode current collector connecting the positive electrode and the positive terminal member;
A negative electrode current collector connecting the negative electrode and the negative terminal member;
The negative electrode terminal member includes a negative electrode external terminal plate disposed on the battery lid via an insulating member, a negative electrode connection terminal having one end connected to the negative electrode current collector and the other end crimped to the negative electrode external terminal plate. And
The material of the negative electrode external terminal plate is copper or a copper alloy,
On the surface of the negative electrode external terminal plate, a metal plating layer made of a material having a lower hardness than the material of the negative electrode external terminal plate is formed,
The secondary battery, wherein the negative electrode connection terminal is crimped to the negative electrode external terminal plate via the metal plating layer.
請求項1に記載の二次電池において、
前記金属メッキ層は、前記負極外部端子板の材質よりもレーザ光の吸収率の高い材質からなり、
負極カシメ部が前記金属メッキ層を介して負極外部端子板にレーザ溶接または電子ビーム溶接されていることを特徴とする二次電池。
The secondary battery according to claim 1,
The metal plating layer is made of a material having a higher absorption rate of laser light than the material of the negative electrode external terminal plate,
A secondary battery, wherein a negative crimp portion is laser welded or electron beam welded to a negative external terminal plate through the metal plating layer.
請求項1または2に記載の二次電池において、
前記金属メッキ層は、錫メッキ層であることを特徴とする二次電池。
The secondary battery according to claim 1 or 2,
The secondary battery is characterized in that the metal plating layer is a tin plating layer.
JP2012152521A 2012-07-06 2012-07-06 Secondary battery Pending JP2014017081A (en)

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