JP2019200859A - Sealed battery - Google Patents

Sealed battery Download PDF

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JP2019200859A
JP2019200859A JP2018093181A JP2018093181A JP2019200859A JP 2019200859 A JP2019200859 A JP 2019200859A JP 2018093181 A JP2018093181 A JP 2018093181A JP 2018093181 A JP2018093181 A JP 2018093181A JP 2019200859 A JP2019200859 A JP 2019200859A
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external terminal
terminal
peripheral edge
base portion
insertion hole
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JP6963730B2 (en
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才昇 大倉
Toshinori Okura
才昇 大倉
中山　博之
Hiroyuki Nakayama
博之 中山
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Toyota Motor Corp
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

To improve reliability of a communication between an inner terminal and an outer terminal.SOLUTION: A tip of an axial part of an inner terminal of a sealed battery includes a shade part 12d expanded in a disc-like state along a peripheral edge part of an insertion hole of an outer terminal 13. A part of an outer peripheral edge 12d1 of the shade part 12d is welded to the peripheral edge part of the insertion hole. A height a of the shade part 12d at a position where a first base part 13a of the outer terminal 13 and the shade part 12d are contacted without a portion to be welded is 0.1 mm<a<0.4 mm, and in a radial direction of the shade part 12d, a distance b from the tip of the outer peripheral edge of the shade part 12d to a position where the first base part 13a of the outer terminal 13 and the shade part 12d are contacted is 0.1 mm<b<0.2 mm.SELECTED DRAWING: Figure 3

Description

本発明は、密閉型電池に関する。   The present invention relates to a sealed battery.

特開２０１７−０８４５８５号公報では、内部端子に設けられた軸部の先端を外部端子に設けられた挿通孔の周縁部にかしめるリベット構造によって、二次電池の内部端子と外部端子とが固定されている。さらに、リベットの笠部と外部端子とが溶接されることによって、二次電池の内部端子と外部端子との導通が確保されている。   In Japanese Patent Application Laid-Open No. 2017-084585, the internal terminal and the external terminal of the secondary battery are fixed by a rivet structure in which the tip of the shaft provided in the internal terminal is caulked to the peripheral edge of the insertion hole provided in the external terminal. Has been. Furthermore, the rivet cap and the external terminal are welded to ensure conduction between the internal terminal and the external terminal of the secondary battery.

特開２０１７−０８４５８５号公報JP 2017-084585 A

ところで、二次電池の内部端子と外部端子との導通が確保するための溶接は、リベットの笠部の外周縁において、周方向の複数箇所に施されている。内部端子と外部端子との導通の信頼性が向上するとの観点において、１つの溶接箇所における溶接面積が大きく、かつ、バラツキが小さいことが望ましい。ここで「溶接面積」は、「導通面積」とも称されうる。   By the way, welding for ensuring conduction between the internal terminal and the external terminal of the secondary battery is performed at a plurality of locations in the circumferential direction on the outer peripheral edge of the cap portion of the rivet. From the viewpoint of improving the reliability of conduction between the internal terminal and the external terminal, it is desirable that the welding area at one welding location is large and the variation is small. Here, the “welding area” may also be referred to as a “conduction area”.

ここで提案される密閉型電池は、取付孔が形成された電池ケース部品と、内部端子と、外部端子と、内部端子および外部端子と、電池ケース部品との間に介在した少なくとも１つの絶縁部材とを備えている。
外部端子は、絶縁部材を介在させて電池ケース部品の外側に重ねられた第１ベース部と、第１ベース部に形成された挿通孔とを備えている。
内部端子は、絶縁部材を介在させて電池ケース部品の内側に重ねられた第２ベース部と、第２ベース部から突出し、絶縁部材を介在させて電池ケース部品の取付孔に挿通され、かつ、外部端子の挿通孔に挿通された軸部とを備えている。
軸部の先端は、外部端子の挿通孔の周縁部に沿って円板状に押し広げられた笠部を有している。笠部の外周縁の一部は、挿通孔の周縁部に溶接されている。
溶接された部位を除いて、笠部の外周縁は、外部端子の前記第１ベース部から浮いている。また、溶接された部位を除いて、外部端子の第１ベース部と笠部とが接する位置における笠部の高さａが、０．１ｍｍ＜ａ＜０．４ｍｍであり、かつ、笠部の径方向において、外部端子の第１ベース部と笠部とが接する位置から笠部の外周縁の先端までの距離ｂが、０．１ｍｍ＜ｂ＜０．２ｍｍである。 The sealed battery proposed here includes at least one insulating member interposed between a battery case part in which a mounting hole is formed, an internal terminal, an external terminal, an internal terminal and an external terminal, and the battery case part. And.
The external terminal includes a first base portion that is overlapped on the outside of the battery case component with an insulating member interposed therebetween, and an insertion hole that is formed in the first base portion.
The internal terminal has an insulating member interposed between the second base portion and the second base portion that is superimposed on the inside of the battery case component, protrudes from the second base portion, is inserted through the mounting hole of the battery case component with the insulating member interposed therebetween, and And a shaft portion inserted through the insertion hole of the external terminal.
The tip of the shaft portion has a cap portion that is spread out in a disk shape along the peripheral edge portion of the insertion hole of the external terminal. A part of the outer periphery of the cap is welded to the periphery of the insertion hole.
Except for the welded portion, the outer peripheral edge of the cap portion floats from the first base portion of the external terminal. Moreover, the height a of the shade portion at the position where the first base portion of the external terminal and the shade portion are in contact with each other except the welded portion is 0.1 mm <a <0.4 mm, and the shade portion In the radial direction, the distance b from the position where the first base portion of the external terminal and the shade portion contact to the tip of the outer peripheral edge of the shade portion is 0.1 mm <b <0.2 mm.

かかる密閉型電池によれば、かかる溶接箇所について、１つの溶接箇所における溶接面積が大きく、かつ、溶接面積のバラツキが小さい。このため、内部端子と外部端子との導通の信頼性が高い。   According to such a sealed battery, the welded area at one welded part is large and the variation in the welded area is small. For this reason, the reliability of conduction between the internal terminal and the external terminal is high.

図１は、本発明の一実施形態に係る密閉型電池１０の部分断面図である。FIG. 1 is a partial cross-sectional view of a sealed battery 10 according to an embodiment of the present invention. 図２は、密閉型電池１０の部分断面図である。FIG. 2 is a partial cross-sectional view of the sealed battery 10. 図３は、笠部１２ｄの外周縁１２ｄ１を拡大した拡大図である。FIG. 3 is an enlarged view in which the outer peripheral edge 12d1 of the shade portion 12d is enlarged. 図４は、内部端子１２の軸部１２ｂの先端が、外部端子１３の挿通孔１３ｂの周縁部にかしめられる工程を示す部分断面図である。FIG. 4 is a partial cross-sectional view showing a process in which the tip of the shaft portion 12 b of the internal terminal 12 is caulked to the peripheral edge portion of the insertion hole 13 b of the external terminal 13.

以下、ここで提案される密閉型電池の一実施形態を説明する。ここで説明される実施形態は、当然ながら特に本発明を限定することを意図したものではない。本発明は、特に言及されない限りにおいて、ここで説明される実施形態に限定されない。   Hereinafter, an embodiment of the sealed battery proposed here will be described. The embodiments described herein are, of course, not intended to limit the present invention in particular. The invention is not limited to the embodiments described herein unless specifically stated.

図１は、本発明の一実施形態に係る密閉型電池１０の部分断面図である。
密閉型電池１０は、図１に示されているように、電池要素としての電極体２０と、電極体２０を収容する電池ケース１１とを備えている。 FIG. 1 is a partial cross-sectional view of a sealed battery 10 according to an embodiment of the present invention.
As shown in FIG. 1, the sealed battery 10 includes an electrode body 20 as a battery element and a battery case 11 that houses the electrode body 20.

電池ケース１１は、例えば、扁平な角型のアルミケースであり得る。電池ケース１１を構成する電池ケース部品としては、電極体２０を収容するケース本体１１ａと、ケース本体１１ａに電極体２０を収容するための開口を塞ぐ蓋１１ｂとが含まれうる。   The battery case 11 can be, for example, a flat rectangular aluminum case. The battery case components constituting the battery case 11 may include a case main body 11a that accommodates the electrode body 20 and a lid 11b that closes an opening for accommodating the electrode body 20 in the case main body 11a.

ここで、電極体２０は、いわゆる電池要素である。電極体２０は、正極集電部２１ａ１と負極集電部２２ａ１とを有している。電極体２０は、例えば、図１に示されているように、長尺の帯状の第１のセパレータシート３１または第２のセパレータシート３２を介在させて、正極シート２１と負極シート２２とを重ねて捲回した、いわゆる捲回電極体でもよい。また、電極体２０の他の形態として、セパレータシートを介在させて、正極シートと負極シートとを重ねた、いわゆる積層型の電極体でもよい。   Here, the electrode body 20 is a so-called battery element. The electrode body 20 has a positive electrode current collector 21a1 and a negative electrode current collector 22a1. For example, as shown in FIG. 1, the electrode body 20 is formed by stacking the positive electrode sheet 21 and the negative electrode sheet 22 with a long strip-shaped first separator sheet 31 or second separator sheet 32 interposed therebetween. A so-called wound electrode body may be used. As another form of the electrode body 20, a so-called laminated electrode body in which a separator sheet is interposed and a positive electrode sheet and a negative electrode sheet are stacked may be used.

正極シート２１は、例えば、正極集電箔２１ａ（例えば、アルミニウム箔）に、幅方向の片側の端部に一定の幅で設定された未形成部２１ａ１を除いて、正極活物質を含む正極活物質層２１ｂが両面に形成されているとよい。正極集電箔２１ａで正極活物質層２１ｂが形成されない未形成部２１ａ１は、電極体２０の正極集電部となりうる。正極活物質は、例えば、リチウムイオン二次電池では、リチウム遷移金属複合材料のように、充電時にリチウムイオンを放出し、放電時にリチウムイオンを吸収しうる材料である。正極活物質は、一般的にリチウム遷移金属複合材料以外にも種々提案されており、特に限定されない。   The positive electrode sheet 21 is, for example, a positive electrode active material containing a positive electrode active material except a positive electrode current collector foil 21a (for example, an aluminum foil) except for an unformed part 21a1 set with a constant width at one end in the width direction. The material layer 21b may be formed on both sides. The non-formed part 21 a 1 where the positive electrode active material layer 21 b is not formed on the positive electrode current collector foil 21 a can be a positive electrode current collector part of the electrode body 20. For example, in a lithium ion secondary battery, the positive electrode active material is a material capable of releasing lithium ions during charging and absorbing lithium ions during discharging, such as a lithium transition metal composite material. Various positive electrode active materials are generally proposed besides lithium transition metal composite materials, and are not particularly limited.

負極シート２２は、負極集電箔２２ａ（例えば、銅箔）に、幅方向の片側の縁に一定の幅で設定された未形成部２２ａ１を除いて、負極活物質を含む負極活物質層が両面に形成されているとよい。負極集電箔２２ａで負極活物質層が形成されない未形成部２２ａ１は、電極体２０の負極集電部となりうる。負極活物質は、例えば、リチウムイオン二次電池では、天然黒鉛のように、充電時にリチウムイオンを吸蔵し、充電時に吸蔵したリチウムイオンを放電時に放出しうる材料である。負極活物質は、一般的に天然黒鉛以外にも種々提案されており、特に限定されない。   The negative electrode sheet 22 has a negative electrode active material layer containing a negative electrode active material, except for a negative electrode current collector foil 22a (for example, a copper foil) except for a non-formed portion 22a1 set at a certain width on one edge in the width direction. It is good to be formed on both sides. The non-formed part 22 a 1 where the negative electrode active material layer is not formed on the negative electrode current collector foil 22 a can be a negative electrode current collector part of the electrode body 20. For example, in the case of a lithium ion secondary battery, the negative electrode active material is a material that can occlude lithium ions during charging and release lithium ions occluded during charging, such as natural graphite. Various negative electrode active materials are generally proposed besides natural graphite, and are not particularly limited.

セパレータシート３１，３２には、例えば、所要の耐熱性を有する電解質が通過しうる多孔質の樹脂シートが用いられる。セパレータシート３１，３２についても種々提案されており、特に限定されない。負極シート２２の負極活物質層２２ｂは、セパレータシート３１，３２を介在させた状態で正極シート２１の正極活物質層２１ｂを覆っているとよい。セパレータシート３１，３２は、さらに正極シート２１の正極活物質層２１ｂおよび負極シート２２の負極活物質層２２ｂを覆っているとよい。   For the separator sheets 31 and 32, for example, a porous resin sheet through which an electrolyte having required heat resistance can pass is used. Various separator sheets 31 and 32 have been proposed and are not particularly limited. The negative electrode active material layer 22b of the negative electrode sheet 22 may cover the positive electrode active material layer 21b of the positive electrode sheet 21 with the separator sheets 31 and 32 interposed therebetween. The separator sheets 31 and 32 may further cover the positive electrode active material layer 21 b of the positive electrode sheet 21 and the negative electrode active material layer 22 b of the negative electrode sheet 22.

正極集電部としての未形成部２１ａ１と負極集電部としての未形成部２２ａ１とは、例えば、幅方向において互いに反対側に向けられている。そして、正極集電部としての未形成部２１ａ１は、セパレータシート３１，３２の幅方向の片側にはみ出ている。負極集電部としての未形成部２２ａ１は、幅方向の反対側においてセパレータシート３１，３２からはみ出ている。   The non-formed part 21a1 as the positive electrode current collector and the non-formed part 22a1 as the negative electrode current collector are directed to opposite sides in the width direction, for example. And the non-formation part 21a1 as a positive electrode current collection part has protruded to the one side of the width direction of the separator sheets 31 and 32. FIG. The non-formed part 22a1 as the negative electrode current collector protrudes from the separator sheets 31 and 32 on the opposite side in the width direction.

なお、電極体２０の具体的な形態は、特に限定されない限りにおいて、ここで例示される形態に限定されない。例えば、密閉型電池１０は、固体電解質を含む全固体電池でもよく、電極体は、全固体電池に用いられるものでもよい。   In addition, the specific form of the electrode body 20 is not limited to the form illustrated here unless it is specifically limited. For example, the sealed battery 10 may be an all-solid battery including a solid electrolyte, and the electrode body may be used for an all-solid battery.

正極集電部としての未形成部２１ａ１と負極集電部としての未形成部２２ａ１とには、それぞれ内部端子１２が取付けられている。内部端子１２は、蓋１１ｂに取付けられ、外部端子１３に固定されている。正極側と負極側で、内部端子１２と外部端子１３とを取り付ける構造は共通している。なお、正極側の内部端子１２には、例えば、アルミニウムやアルミ合金などの金属が用いられている。負極側の内部端子１２には、例えば、銅や銅合金などの金属が用いられている。   Internal terminals 12 are attached to the non-formed part 21a1 as the positive electrode current collector and the non-formed part 22a1 as the negative electrode current collector. The internal terminal 12 is attached to the lid 11 b and fixed to the external terminal 13. The structure for attaching the internal terminal 12 and the external terminal 13 on the positive electrode side and the negative electrode side is common. For example, a metal such as aluminum or an aluminum alloy is used for the internal terminal 12 on the positive electrode side. For example, a metal such as copper or a copper alloy is used for the internal terminal 12 on the negative electrode side.

図２は、密閉型電池１０の部分断面図である。図２では、電池ケース１１の蓋１１ｂに内部端子１２と外部端子１３とが取り付けられた部位が図示されている。
ここで、密閉型電池１０は、図２に示されているように、電池ケース部品としての蓋１１ｂと、内部端子１２と、外部端子１３と、絶縁部材１４，１５とを備えている。 FIG. 2 is a partial cross-sectional view of the sealed battery 10. In FIG. 2, a portion where the internal terminal 12 and the external terminal 13 are attached to the lid 11 b of the battery case 11 is illustrated.
Here, as shown in FIG. 2, the sealed battery 10 includes a lid 11 b as a battery case component, an internal terminal 12, an external terminal 13, and insulating members 14 and 15.

蓋１１ｂには、図２に示されているように、内部端子１２と外部端子１３とを取り付けるための取付孔１１ｂ１（図２参照）が形成されている。蓋１１ｂには、正極側の内部端子１２と外部端子１３とを取り付けるための取付孔１１ｂ１と、負極側の内部端子１２と外部端子１３とを取り付けるための取付孔１１ｂ１とがそれぞれ形成されているとよい。   As shown in FIG. 2, the lid 11 b is formed with an attachment hole 11 b 1 (see FIG. 2) for attaching the internal terminal 12 and the external terminal 13. An attachment hole 11b1 for attaching the positive-side internal terminal 12 and the external terminal 13 and an attachment hole 11b1 for attaching the negative-side internal terminal 12 and the external terminal 13 are formed in the lid 11b. Good.

外部端子１３は、ベース部１３ａと、挿通孔１３ｂとを備えている。外部端子１３のベース部１３ａは、適宜に第１ベース部と称される。第１ベース部１３ａは、絶縁部材１４，１５を介在させて電池ケース部品としての蓋１１ｂの外側に重ねられている。挿通孔１３ｂは、第１ベース部１３ａに形成されている。また、この実施形態では、図１に示されているように、バスバー（図示省略）を取付けるための接続端子１６が外部端子１３に取付けられている。外部端子１３は、バスバー（図示省略）を通じて、パワーコントロールユニットに接続され、充電や放電において電流が入力または出力される。   The external terminal 13 includes a base portion 13a and an insertion hole 13b. The base portion 13a of the external terminal 13 is appropriately referred to as a first base portion. The first base portion 13a is overlaid on the outside of the lid 11b as a battery case component with the insulating members 14 and 15 interposed therebetween. The insertion hole 13b is formed in the first base portion 13a. In this embodiment, as shown in FIG. 1, the connection terminal 16 for attaching a bus bar (not shown) is attached to the external terminal 13. The external terminal 13 is connected to a power control unit through a bus bar (not shown), and current is input or output during charging or discharging.

ここで絶縁部材１４，１５は、内部端子１２および外部端子１３と、蓋１１ｂとの間に介在した絶縁部材である。この実施形態では、絶縁部材１４は、ガスケットであり、絶縁部材１５は、インシュレータ１５である。   The insulating members 14 and 15 are insulating members interposed between the internal terminal 12 and the external terminal 13 and the lid 11b. In this embodiment, the insulating member 14 is a gasket and the insulating member 15 is an insulator 15.

ガスケット１４は、蓋１１ｂと内部端子１２との間に介在した絶縁部材である。蓋１１ｂの取付孔１１ｂ１のシール性を確保するとともに、蓋１１ｂと内部端子１２とを絶縁している。ガスケット１４は、所要の弾性を有する樹脂部材にて構成されている。ガスケット１４には、例えば、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体（ＰＦＡとも称されうる。）が用いられうる。   The gasket 14 is an insulating member interposed between the lid 11 b and the internal terminal 12. The sealing property of the attachment hole 11b1 of the lid 11b is ensured, and the lid 11b and the internal terminal 12 are insulated. The gasket 14 is made of a resin member having required elasticity. For the gasket 14, for example, a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (also referred to as PFA) can be used.

この実施形態では、ガスケット１４は、筒部１４ａと、鍔部１４ｂと、囲い部１４ｃと、受け部１４ｄとを有している。筒部１４ａは、鍔部１４ｂから突出した部位であり、蓋１１ｂの取付孔１１ｂ１の内周面に装着される部位である。筒部１４ａには、図２に示されているように、内部端子１２の軸部１２ｂが装着される。鍔部１４ｂは、筒部１４ａの一端から径方向に沿って延びており、蓋１１ｂの内側面に装着される板状の部位である。囲い部１４ｃは、鍔部１４ｂの周縁から筒部１４ａとは反対側に延びている。受け部１４ｄは、ガスケット１４の下面に設けられている。受け部１４ｄは、内部端子１２のベース部１２ａの形状に応じた窪みを有している。   In this embodiment, the gasket 14 has a cylindrical portion 14a, a flange portion 14b, a surrounding portion 14c, and a receiving portion 14d. The cylindrical portion 14a is a portion that protrudes from the flange portion 14b, and is a portion that is attached to the inner peripheral surface of the attachment hole 11b1 of the lid 11b. As shown in FIG. 2, the shaft portion 12 b of the internal terminal 12 is attached to the tube portion 14 a. The flange portion 14b extends from one end of the cylindrical portion 14a along the radial direction, and is a plate-like portion that is attached to the inner surface of the lid 11b. The enclosure portion 14c extends from the peripheral edge of the flange portion 14b to the side opposite to the cylindrical portion 14a. The receiving portion 14 d is provided on the lower surface of the gasket 14. The receiving portion 14 d has a recess corresponding to the shape of the base portion 12 a of the internal terminal 12.

インシュレータ１５は、蓋１１ｂの外側に配置され、蓋１１ｂと、外部端子１３および接続端子１６とを絶縁する部材である。インシュレータ１５は、樹脂部材にて構成されている。インシュレータ１５には、例えば、ポリプロピレン（ＰＰとも称されうる。）や、ポリエチレン（ＰＥとも称されうる。）、ポリフェニレンサルファイド樹脂（ＰＰＳとも称されうる。）が用いられうる。インシュレータ１５には、図２に示されているように、内部端子１２の軸部１２ｂが挿通される挿通孔１５ａが形成されている。   The insulator 15 is a member that is disposed outside the lid 11 b and insulates the lid 11 b from the external terminal 13 and the connection terminal 16. The insulator 15 is composed of a resin member. For the insulator 15, for example, polypropylene (also referred to as PP), polyethylene (also referred to as PE), or polyphenylene sulfide resin (also referred to as PPS) can be used. As shown in FIG. 2, the insulator 15 is formed with an insertion hole 15 a through which the shaft portion 12 b of the internal terminal 12 is inserted.

この実施形態では、絶縁部材１４，１５は、ガスケット１４とインシュレータ１５との２部材で構成されている。絶縁部材１４，１５は、内部端子１２および外部端子１３と、電池ケース部品としての蓋１１ｂとの間に介在しているとよい。かかる観点において、絶縁部材１４，１５は、図２の形態に限定されず、一部材で構成されていてもよい。また、絶縁部材１４，１５は、さらに複数の部材で構成されていてもよい。   In this embodiment, the insulating members 14 and 15 are composed of two members, a gasket 14 and an insulator 15. The insulating members 14 and 15 are preferably interposed between the internal terminal 12 and the external terminal 13 and the lid 11b as a battery case component. In this respect, the insulating members 14 and 15 are not limited to the form shown in FIG. Moreover, the insulating members 14 and 15 may be further configured by a plurality of members.

内部端子１２は、ベース部１２ａと、軸部１２ｂとを備えている。内部端子１２のベース部１２ａは、適宜に第２ベース部と称される。
第２ベース部１２ａは、ガスケット１４を介在させて電池ケース部品の内側に重ねられる部位である。図１に示されているように、第２ベース部１２ａには、電池ケース１１の内部に延びる取付片１２ｃが設けられている。正極側の内部端子１２の取付片１２ｃには、正極集電部２１ａ１が取付けられる。負極側の内部端子１２の取付片１２ｃには、負極集電部２２ａ１が取付けられる。
軸部１２ｂは、図２に示されているように、内部端子１２の第２ベース部１２ａから突出し、絶縁部材としてのガスケット１４とインシュレータ１５を介在させて蓋１１ｂの取付孔１１ｂ１に挿通されている。軸部１２ｂは、さらに、外部端子１３の挿通孔１３ｂに挿通されている。 The internal terminal 12 includes a base portion 12a and a shaft portion 12b. The base portion 12a of the internal terminal 12 is appropriately referred to as a second base portion.
The second base portion 12a is a portion that is overlapped inside the battery case component with the gasket 14 interposed. As shown in FIG. 1, the second base portion 12 a is provided with a mounting piece 12 c that extends inside the battery case 11. A positive electrode current collector 21a1 is attached to the attachment piece 12c of the internal terminal 12 on the positive electrode side. A negative electrode current collector 22a1 is attached to the attachment piece 12c of the internal terminal 12 on the negative electrode side.
As shown in FIG. 2, the shaft portion 12b protrudes from the second base portion 12a of the internal terminal 12, and is inserted through the mounting hole 11b1 of the lid 11b with a gasket 14 and an insulator 15 as insulating members interposed therebetween. Yes. The shaft portion 12 b is further inserted through the insertion hole 13 b of the external terminal 13.

軸部１２ｂの先端は、外部端子１３の挿通孔１３ｂの周縁部に沿って円板状に押し広げられた笠部１２ｄを有している。笠部１２ｄの外周縁１２ｄ１の一部は、図２に示されているように、挿通孔１３ｂの周縁部に溶接されている。   The tip of the shaft portion 12b has a cap portion 12d that is spread out in a disk shape along the peripheral edge portion of the insertion hole 13b of the external terminal 13. A part of the outer peripheral edge 12d1 of the cap 12d is welded to the peripheral edge of the insertion hole 13b as shown in FIG.

図３は、溶接された部位１２ｅ（図２参照）を除く笠部１２ｄの外周縁１２ｄ１を拡大した拡大図である。
笠部１２ｄの外周縁１２ｄ１は、図３に示されているように、溶接された部位１２ｅを除いて、外部端子１３の第１ベース部１３ａから少し浮いている。 FIG. 3 is an enlarged view of the outer peripheral edge 12d1 of the shade 12d excluding the welded portion 12e (see FIG. 2).
As shown in FIG. 3, the outer peripheral edge 12 d 1 of the cap portion 12 d slightly floats from the first base portion 13 a of the external terminal 13 except for the welded portion 12 e.

この実施形態では、溶接された部位１２ｅを除いて、外部端子１３の第１ベース部１３ａと笠部１２ｄとが接する位置における笠部１２ｄの高さａが、０．１ｍｍ＜ａ＜０．４ｍｍである。ここで、笠部１２ｄの高さａは、「エッジ高さ」とも称されうる。さらに、笠部１２ｄの径方向において、外部端子１３の第１ベース部１３ａと笠部１２ｄとが接する位置から笠部１２ｄの外周縁の先端までの距離ｂが、０．１ｍｍ＜ｂ＜０．２ｍｍである。ここで、当該距離ｂは、「エッジ長さ」とも称されうる。   In this embodiment, except for the welded portion 12e, the height a of the cap portion 12d at the position where the first base portion 13a of the external terminal 13 is in contact with the cap portion 12d is 0.1 mm <a <0.4 mm. It is. Here, the height a of the cap portion 12d may be referred to as “edge height”. Further, in the radial direction of the cap portion 12d, the distance b from the position where the first base portion 13a of the external terminal 13 contacts the cap portion 12d to the tip of the outer peripheral edge of the cap portion 12d is 0.1 mm <b <0. 2 mm. Here, the distance b may also be referred to as “edge length”.

この密閉型電池１０では、内部端子１２と外部端子１３との１つの溶接箇所における溶接面積が大きく、かつ、溶接面積のバラツキが小さい。このため、内部端子１２と外部端子１３との導通についての信頼性が高い。ここで、溶接面積は、内部端子１２と外部端子１３との１つの溶接箇所の面積で評価されうる。溶接面積は、例えば、第１ベース部１３ａ上に形成される溶接箇所の面積で評価されてもよい。上記の笠部１２ｄのエッジ高さａと、エッジ長さｂの寸法関係は、笠部１２ｄが第１ベース部１３ａに溶接された後においては、例えば、それぞれ溶接された部位１２ｅを除く、笠部１２ｄの周方向の算術平均において評価されうる。したがって、笠部１２ｄの外周縁１２ｄ１の周方向の一部において、上記の関係を満たさない部位があってもよい。また、上記の寸法関係は、例えば、笠部１２ｄの周方向のうち、溶接された部位１２ｅの周辺部分の算術平均において評価されてもよい。   In the sealed battery 10, the welding area at one welding location between the internal terminal 12 and the external terminal 13 is large, and the variation in the welding area is small. For this reason, the reliability of the conduction between the internal terminal 12 and the external terminal 13 is high. Here, the welding area can be evaluated by the area of one welding location between the internal terminal 12 and the external terminal 13. The welding area may be evaluated by, for example, the area of the welding portion formed on the first base portion 13a. The dimensional relationship between the edge height a and the edge length b of the shade portion 12d is such that, for example, after the shade portion 12d is welded to the first base portion 13a, the shade portion 12e is excluded. It can be evaluated in the arithmetic average of the circumferential direction of the part 12d. Therefore, there may be a portion that does not satisfy the above relationship in a part of the outer peripheral edge 12d1 of the cap portion 12d in the circumferential direction. Moreover, said dimension relationship may be evaluated in the arithmetic average of the peripheral part of the welded site | part 12e among the circumferential directions of the cap part 12d, for example.

つまり、蓋１１ｂにガスケット１４とインシュレータ１５とを介在させて内部端子１２と外部端子１３とを組付け、内部端子１２の軸部１２ｂの先端を、外部端子１３の挿通孔１３ｂの周縁部にかしめる。このとき、形成される笠部１２ｄにおいて、上記のエッジ高さａとエッジ長さｂの寸法関係が０．１ｍｍ＜ａ＜０．４ｍｍ、かつ、０．１ｍｍ＜ｂ＜０．２ｍｍであるとよい。つまり、エッジ高さａが高すぎず、かつ、エッジ長さｂが適度に長いとよい。そして、当該笠部１２ｄの外周縁が、周方向の一部において外部端子１３に溶接されるとよい。この場合、エッジ高さａが高すぎず、かつ、エッジ長さｂが適度に長いので、溶接される笠部１２ｄの外周縁の熱容量（「熱マス」とも称される。）が小さく抑えられ、かつ、溶湯量が増加する。これにより、内部端子１２と外部端子１３との１つの溶接箇所における溶接面積が大きくなり、かつ、溶接面積のバラツキが小さくなる。そして、内部端子１２と外部端子１３との導通についての信頼性が高くなる。   That is, the internal terminal 12 and the external terminal 13 are assembled by interposing the gasket 14 and the insulator 15 on the lid 11b, and the tip of the shaft portion 12b of the internal terminal 12 is connected to the peripheral portion of the insertion hole 13b of the external terminal 13. Close. At this time, in the formed shade portion 12d, the dimensional relationship between the edge height a and the edge length b is 0.1 mm <a <0.4 mm and 0.1 mm <b <0.2 mm. Good. That is, it is preferable that the edge height a is not too high and the edge length b is appropriately long. And the outer periphery of the said cap part 12d is good to be welded to the external terminal 13 in a part of circumferential direction. In this case, since the edge height a is not too high and the edge length b is appropriately long, the heat capacity (also referred to as “heat mass”) of the outer peripheral edge of the cap 12d to be welded can be kept small. And the amount of molten metal increases. Thereby, the welding area in one welding location of the internal terminal 12 and the external terminal 13 becomes large, and the variation in a welding area becomes small. And the reliability about conduction | electrical_connection with the internal terminal 12 and the external terminal 13 becomes high.

ここで、図４は、内部端子１２の軸部１２ｂの先端が、外部端子１３の挿通孔１３ｂの周縁部にかしめられる工程を示す部分断面図である。図４に示されているように、内部端子１２の軸部１２ｂは、外部端子１３の挿通孔１３ｂの周縁部にかしめられる前には、外部端子１３の挿通孔１３ｂから突出している。軸部１２ｂの中心には、窪み１２ｂ１が形成されている。ツール４０は回転しながら、窪み１２ｂ１を押し広げるように軸部１２ｂの先端に押し当てられる。このとき、エッジ高さａとエッジ長さｂが、０．１ｍｍ＜ａ＜０．４ｍｍ、かつ、０．１ｍｍ＜ｂ＜０．２ｍｍとなるには、例えば、外部端子１３の挿通孔１３ｂの周縁部にかしめられる前の形状において、内部端子１２の軸部１２ｂが外部端子１３の挿通孔１３ｂから突出している高さを低くし、かつ、ツール４０を押し下げる量（下死点とも称される）を低く設定するとよい。これにより、エッジ高さａが高くなりすぎず、かつ、エッジ長さｂが適度に長くなる。このように、かしめられる前の内部端子１２の軸部１２ｂの突出量と、ツールが軸部１２ｂを押し下げる量を調整することによって、０．１ｍｍ＜ａ＜０．４ｍｍ、かつ、０．１ｍｍ＜ｂ＜０．２ｍｍとなる笠部１２ｄが安定して得られうる。   Here, FIG. 4 is a partial cross-sectional view showing a process in which the tip of the shaft portion 12 b of the internal terminal 12 is caulked to the peripheral edge portion of the insertion hole 13 b of the external terminal 13. As shown in FIG. 4, the shaft portion 12 b of the internal terminal 12 protrudes from the insertion hole 13 b of the external terminal 13 before being caulked to the peripheral edge portion of the insertion hole 13 b of the external terminal 13. A recess 12b1 is formed at the center of the shaft portion 12b. While rotating, the tool 40 is pressed against the tip of the shaft portion 12b so as to expand the recess 12b1. At this time, in order for the edge height a and the edge length b to be 0.1 mm <a <0.4 mm and 0.1 mm <b <0.2 mm, for example, the peripheral portion of the insertion hole 13b of the external terminal 13 In the shape before being caulked, the amount by which the shaft portion 12b of the internal terminal 12 protrudes from the insertion hole 13b of the external terminal 13 is lowered and the amount by which the tool 40 is pushed down (also referred to as bottom dead center) is set. A low setting is recommended. Thereby, the edge height a does not become too high, and the edge length b becomes appropriately long. In this way, by adjusting the protruding amount of the shaft portion 12b of the internal terminal 12 before being crimped and the amount by which the tool pushes down the shaft portion 12b, 0.1 mm <a <0.4 mm and 0.1 mm < The cap portion 12d satisfying b <0.2 mm can be obtained stably.

本発明者は、かしめられる前の内部端子１２の軸部１２ｂの突出量と、ツールが軸部１２ｂを押し下げる量を調整することによって、エッジ高さａとエッジ長さｂが異なる笠部１２ｄを種々形成し、笠部１２ｄの外周縁を一定の条件でレーザー溶接してそれぞれ溶接面積を評価した。
その結果、溶接前の笠部１２ｄのエッジ高さａが０．１ｍｍ＜ａ＜０．４ｍｍであり、かつ、エッジ長さｂが０．１ｍｍ＜ｂ＜０．２ｍｍである場合に、１．０ｍｍ２以上の導通面積が安定して確保され、溶接面積が大きく、かつ、バラツキが小さく安定することが見出された。このように、溶接前の笠部１２ｄのエッジ高さａを０．１ｍｍ＜ａ＜０．４ｍｍとし、かつ、エッジ長さｂを０．１ｍｍ＜ｂ＜０．２ｍｍとすることによって、内部端子１２と外部端子１３との導通についての信頼性が高い密閉型電池１０が得られやすくなる。 The inventor adjusts the protruding amount of the shaft portion 12b of the internal terminal 12 before being crimped and the amount by which the tool pushes down the shaft portion 12b, thereby forming the cap portion 12d having different edge height a and edge length b. Various formations were made, and the outer peripheral edge of the cap portion 12d was laser-welded under certain conditions to evaluate the welding area.
As a result, when the edge height a of the cap 12d before welding is 0.1 mm <a <0.4 mm and the edge length b is 0.1 mm <b <0.2 mm, It has been found that a conduction area of 0 mm 2 or more is stably secured, the welding area is large, and the variation is small and stable. Thus, by setting the edge height a of the cap 12d before welding to 0.1 mm <a <0.4 mm and the edge length b to 0.1 mm <b <0.2 mm, the internal terminal It becomes easy to obtain the sealed battery 10 having high reliability in connection between the electrical connection 12 and the external terminal 13.

このように、内部端子１２の軸部１２ｂの先端を、外部端子１３の挿通孔１３ｂの周縁部にかしめる。このとき、形成される笠部１２ｄのエッジ高さａとエッジ長さｂが、０．１ｍｍ＜ａ＜０．４ｍｍ，かつ、０．１ｍｍ＜ｂ＜０．２ｍｍの関係を有しているとよい。そして、当該笠部１２ｄの外周縁が、周方向の一部において外部端子１３に溶接されるとよい。これによって、溶接面積が大きく、かつ、バラツキが小さく、内部端子１２と外部端子１３との導通についての信頼性が高い密閉型電池１０が得られる。また、内部端子１２と外部端子１３との導通を確保するとの観点において、十分な溶接面積を確保するための溶接箇所を少なくできる。また、溶接面積を確保するのに必要な溶接出力（レーザー溶接であればレーザーの出力）を低く抑えることができる。このように密閉型電池１０を生産するのに要するサイクルタイムの短縮や生産能力の増加が図られる。   In this way, the tip of the shaft portion 12 b of the internal terminal 12 is caulked to the peripheral edge portion of the insertion hole 13 b of the external terminal 13. At this time, the edge height a and the edge length b of the shaded portion 12d to be formed have a relationship of 0.1 mm <a <0.4 mm and 0.1 mm <b <0.2 mm. Good. And the outer periphery of the said cap part 12d is good to be welded to the external terminal 13 in a part of circumferential direction. As a result, the sealed battery 10 having a large welding area, small variation, and high reliability in connection between the internal terminal 12 and the external terminal 13 is obtained. In addition, from the viewpoint of ensuring conduction between the internal terminal 12 and the external terminal 13, the number of welding locations for securing a sufficient welding area can be reduced. Moreover, the welding output necessary for securing the welding area (laser output in the case of laser welding) can be kept low. Thus, the cycle time required for producing the sealed battery 10 can be shortened and the production capacity can be increased.

ここで、蓋１１ｂにガスケット１４とインシュレータ１５とを介在させて内部端子１２と外部端子１３とを組付け、内部端子１２の軸部１２ｂの先端を、外部端子１３の挿通孔１３ｂの周縁部にかしめる。このとき、形成される笠部１２ｄの外周縁１２ｄ１は、溶接される前において、大凡笠部１２ｄのエッジ高さａとエッジ長さｂが、大凡０．１ｍｍ＜ａ＜０．４ｍｍ，かつ、０．１ｍｍ＜ｂ＜０．２ｍｍの関係を有しているとよい。そして、当該笠部１２ｄの外周縁が、周方向の一部において外部端子１３に溶接されるとよい。これにより、内部端子１２と外部端子１３との１つの溶接箇所における溶接面積が大きく、かつ、溶接面積のバラツキが小さくなる。そして、内部端子１２と外部端子１３との導通についての信頼性が高くなる。   Here, the internal terminal 12 and the external terminal 13 are assembled by interposing the gasket 14 and the insulator 15 in the lid 11b, and the tip of the shaft portion 12b of the internal terminal 12 is attached to the peripheral portion of the insertion hole 13b of the external terminal 13. Caulking. At this time, the outer peripheral edge 12d1 of the cap portion 12d to be formed has an edge height a and an edge length b of approximately the cap portion 12d of approximately 0.1 mm <a <0.4 mm, and before being welded. It is good to have a relationship of 0.1 mm <b <0.2 mm. And the outer periphery of the said cap part 12d is good to be welded to the external terminal 13 in a part of circumferential direction. Thereby, the welding area in one welding location with the internal terminal 12 and the external terminal 13 is large, and the variation in a welding area becomes small. And the reliability about conduction | electrical_connection with the internal terminal 12 and the external terminal 13 becomes high.

ここで、溶接される前において、笠部１２ｄのエッジ高さａとエッジ長さｂが、０．１ｍｍ＜ａ＜０．４ｍｍ，かつ、０．１ｍｍ＜ｂ＜０．２ｍｍの関係を有するように、外部端子１３の挿通孔１３ｂの周縁部にかしめられる内部端子１２の軸部１２ｂの先端の形状や突出量、軸部１２ｂの先端がかしめられる際にツール４０が押し下げられる量（「ツールの下死量」とも称される。）が調整されているとよい。
笠部１２ｄのエッジ高さａとエッジ長さｂの寸法関係、０．１ｍｍ＜ａ＜０．４ｍｍ，かつ、０．１ｍｍ＜ｂ＜０．２ｍｍを得るための、内部端子１２の軸部１２ｂの先端の形状や突出量、ツールの下死量は、実験を繰り返すことによって見出されうる。 Here, before welding, the edge height a and the edge length b of the cap 12d have a relationship of 0.1 mm <a <0.4 mm and 0.1 mm <b <0.2 mm. In addition, the shape and protruding amount of the tip end of the shaft portion 12b of the internal terminal 12 caulked to the peripheral portion of the insertion hole 13b of the external terminal 13, and the amount by which the tool 40 is pushed down when the tip end of the shaft portion 12b is caulked (“the tool Also referred to as “bottom mortality”).
Shaft portion 12b of internal terminal 12 for obtaining the dimensional relationship between edge height a and edge length b of cap portion 12d, 0.1 mm <a <0.4 mm, and 0.1 mm <b <0.2 mm. The shape of the tip, the amount of protrusion, and the amount of tool mortality can be found by repeating the experiment.

以上、ここで提案される密閉型電池について、種々説明した。特に言及されない限りにおいて、ここで挙げられた密閉型電池の実施形態などは、本発明を限定しない。   Heretofore, various types of sealed batteries proposed here have been described. Unless otherwise stated, the embodiments of the sealed battery and the like listed here do not limit the present invention.

１０ 密閉型電池
１１ 電池ケース
１１ａ ケース本体
１１ｂ 蓋
１１ｂ１ 取付孔
１２ 内部端子
１２ａ ベース部（第２ベース部）
１２ｂ 軸部
１２ｃ 取付片
１２ｄ 笠部
１２ｄ１ 外周縁
１２ｅ 溶接された部位
１３ 外部端子
１３ａ ベース部（第１ベース部）
１３ｂ 挿通孔
１４ ガスケット（絶縁部材）
１４ａ 筒部
１４ｂ 鍔部
１４ｃ 囲い部
１４ｄ 受け部
１５ インシュレータ（絶縁部材）
１５ａ 挿通孔
１６ 接続端子
２０ 電極体
２１ 正極シート
２１ａ 正極集電箔
２１ａ１ 未形成部（正極集電部）
２１ｂ 正極活物質層
２２ 負極シート
２２ａ 負極集電箔
２２ａ１ 未形成部（負極集電部）
２２ｂ 負極活物質層
３１，３２ セパレータシート DESCRIPTION OF SYMBOLS 10 Sealed battery 11 Battery case 11a Case main body 11b Cover 11b1 Mounting hole 12 Internal terminal 12a Base part (2nd base part)
12b Shaft portion 12c Mounting piece 12d Cap portion 12d1 Outer peripheral edge 12e Welded portion 13 External terminal 13a Base portion (first base portion)
13b Insertion hole 14 Gasket (insulating member)
14a cylinder part 14b collar part 14c enclosure part 14d receiving part 15 insulator (insulating member)
15a Insertion hole 16 Connection terminal 20 Electrode body 21 Positive electrode sheet 21a Positive electrode current collector foil 21a1 Unformed part (positive electrode current collector part)
21b Positive electrode active material layer 22 Negative electrode sheet 22a Negative electrode current collector foil 22a1 Unformed part (negative electrode current collector part)
22b Negative electrode active material layer 31, 32 Separator sheet

Claims (1)

取付孔が形成された電池ケース部品と、
内部端子と、
外部端子と、
前記内部端子および前記外部端子と、前記電池ケース部品との間に介在した少なくとも１つの絶縁部材と
を備え、
前記外部端子は、前記絶縁部材を介在させて前記電池ケース部品の外側に重ねられた第１ベース部と、
前記第１ベース部に形成された挿通孔と
を備え、
前記内部端子は、
前記絶縁部材を介在させて前記電池ケース部品の内側に重ねられた第２ベース部と、
前記第２ベース部から突出し、前記絶縁部材を介在させて前記電池ケース部品の前記取付孔に挿通され、かつ、前記外部端子の前記挿通孔に挿通された軸部と
を備え、
前記軸部の先端は、前記外部端子の前記挿通孔の周縁部に沿って円板状に押し広げられた笠部を有し、
前記笠部の外周縁の一部は、前記挿通孔の周縁部に溶接されており、
溶接された部位を除いて、前記笠部の外周縁は、前記外部端子の前記第１ベース部から浮いており、
前記外部端子の前記第１ベース部と前記笠部とが接する位置における前記笠部の高さａが、０．１ｍｍ＜ａ＜０．４ｍｍであり、かつ、
前記笠部の径方向において、前記外部端子の前記第１ベース部と前記笠部とが接する位置から前記笠部の外周縁の先端までの距離ｂが、０．１ｍｍ＜ｂ＜０．２ｍｍである、
密閉型電池。 A battery case part with a mounting hole;
Internal terminals,
An external terminal,
Comprising at least one insulating member interposed between the internal terminal and the external terminal and the battery case component;
The external terminal is a first base portion that is overlaid on the outside of the battery case component with the insulating member interposed therebetween,
An insertion hole formed in the first base portion,
The internal terminal is
A second base portion that is overlapped inside the battery case component with the insulating member interposed therebetween;
A shaft portion that protrudes from the second base portion, is inserted through the attachment hole of the battery case component with the insulating member interposed therebetween, and is inserted into the insertion hole of the external terminal;
The tip of the shaft portion has a cap portion that is spread in a disk shape along the peripheral edge of the insertion hole of the external terminal,
A part of the outer peripheral edge of the cap is welded to the peripheral edge of the insertion hole,
Except for the welded portion, the outer peripheral edge of the cap portion floats from the first base portion of the external terminal,
The height a of the shade portion at a position where the first base portion and the shade portion of the external terminal are in contact with each other is 0.1 mm <a <0.4 mm, and
In the radial direction of the shade portion, a distance b from a position where the first base portion of the external terminal contacts the shade portion to a tip of the outer peripheral edge of the shade portion is 0.1 mm <b <0.2 mm. is there,
Sealed battery.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112019006922T5 (en) 2019-02-26 2021-11-04 Ngk Insulators, Ltd. Sensor element and gas sensor
DE112020005449T5 (en) 2019-11-05 2022-08-18 Ngk Insulators, Ltd. SENSOR ELEMENT

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010131298A1 (en) * 2009-05-15 2010-11-18 トヨタ自動車株式会社 Method of laser-welding and method of manufacturig battery including the same
JP2014011073A (en) * 2012-06-29 2014-01-20 Toyota Motor Corp Battery, manufacturing method of the battery and mask member for manufacturing the battery
JP2014167846A (en) * 2013-02-28 2014-09-11 Sanyo Electric Co Ltd Square secondary battery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010131298A1 (en) * 2009-05-15 2010-11-18 トヨタ自動車株式会社 Method of laser-welding and method of manufacturig battery including the same
JP2014011073A (en) * 2012-06-29 2014-01-20 Toyota Motor Corp Battery, manufacturing method of the battery and mask member for manufacturing the battery
JP2014167846A (en) * 2013-02-28 2014-09-11 Sanyo Electric Co Ltd Square secondary battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112019006922T5 (en) 2019-02-26 2021-11-04 Ngk Insulators, Ltd. Sensor element and gas sensor
DE112020005449T5 (en) 2019-11-05 2022-08-18 Ngk Insulators, Ltd. SENSOR ELEMENT

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