JP6963730B2 - Sealed battery - Google Patents

Sealed battery Download PDF

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JP6963730B2
JP6963730B2 JP2018093181A JP2018093181A JP6963730B2 JP 6963730 B2 JP6963730 B2 JP 6963730B2 JP 2018093181 A JP2018093181 A JP 2018093181A JP 2018093181 A JP2018093181 A JP 2018093181A JP 6963730 B2 JP6963730 B2 JP 6963730B2
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external terminal
peripheral edge
cap portion
terminal
insertion hole
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JP2019200859A (en
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才昇 大倉
博之 中山
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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

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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 portion provided in the internal terminal is crimped to the peripheral edge of the insertion hole provided in the external terminal. Has been done. Further, by welding the cap portion of the rivet and the external terminal, the continuity between the internal terminal and the external terminal of the secondary battery is ensured.

特開２０１７−０８４５８５号公報Japanese Unexamined Patent Publication No. 2017-084585

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 continuity 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 point is large and the variation is small. Here, the "welded area" can also be referred to as a "conducting 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 is an at least one insulating member interposed between a battery case component having mounting holes, an internal terminal, an external terminal, an internal terminal, an external terminal, and a battery case component. And have.
The external terminal includes a first base portion that is laminated on the outside of the battery case component with an insulating member interposed therebetween, and an insertion hole formed in the first base portion.
The internal terminals protrude from the second base portion and the second base portion, which are stacked inside the battery case component with the insulating member interposed therebetween, and are inserted into the mounting holes of the battery case component with the insulation member interposed therebetween. It is provided with a shaft portion inserted into an insertion hole of an external terminal.
The tip of the shaft portion has a cap portion that is expanded in a disk shape along the peripheral edge portion 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. Further, the height a of the cap portion at the position where the first base portion of the external terminal and the cap portion are in contact with each other, excluding the welded portion, is 0.1 mm <a <0.4 mm, and the cap portion of the cap portion. In the radial direction, the distance b from the position where the first base portion of the external terminal and the cap portion contact to the tip of the outer peripheral edge of the cap 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, with respect to such a welded portion, the welded area at one welded portion is large and the variation in the welded area is small. Therefore, the reliability of continuity 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 of the outer peripheral edge 12d1 of the shade portion 12d. 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 12b of the internal terminal 12 is crimped to the peripheral edge portion of the insertion hole 13b 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 specifically limit the present invention. The present invention is not limited to the embodiments described herein, unless otherwise specified.

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 for accommodating 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 square aluminum case. The battery case component constituting the battery case 11 may include a case body 11a for accommodating the electrode body 20 and a lid 11b for closing the opening for accommodating the electrode body 20 in the case 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. In the electrode body 20, for example, as shown in FIG. 1, the positive electrode sheet 21 and the negative electrode sheet 22 are overlapped with each other with a long strip-shaped first separator sheet 31 or a second separator sheet 32 interposed therebetween. It may be a so-called wound electrode body that has been wound. Further, as another form of the electrode body 20, a so-called laminated electrode body in which a positive electrode sheet and a negative electrode sheet are laminated with a separator sheet interposed therebetween 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 contains, for example, a positive electrode active material containing a positive electrode active material, except for an unformed portion 21a1 set in a positive electrode current collecting foil 21a (for example, an aluminum foil) with a constant width at one end in the width direction. It is preferable that the material layer 21b is formed on both sides. The unformed portion 21a1 in which the positive electrode active material layer 21b is not formed on the positive electrode current collecting foil 21a can be the positive electrode current collecting portion of the electrode body 20. The positive electrode active material is, for example, a material capable of releasing lithium ions during charging and absorbing lithium ions during discharging, such as a lithium transition metal composite material in a lithium ion secondary battery. Various positive electrode active materials have been generally proposed in addition to the lithium transition metal composite material, 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 an unformed portion 22a1 set on one edge in the width direction with a constant width on the negative electrode current collecting foil 22a (for example, copper foil). It is preferable that it is formed on both sides. The unformed portion 22a1 in which the negative electrode active material layer is not formed on the negative electrode current collecting foil 22a can be the negative electrode current collecting portion of the electrode body 20. The negative electrode active material is, for example, a material that can occlude lithium ions during charging and release the stored lithium ions during charging, such as natural graphite in a lithium ion secondary battery. Various negative electrode active materials have been generally proposed in addition to 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 a required heat resistance can pass is used. Various separator sheets 31 and 32 have also 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 21b of the positive electrode sheet 21 and the negative electrode active material layer 22b 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 unformed portion 21a1 as the positive electrode current collecting portion and the unformed portion 22a1 as the negative electrode current collecting portion are directed to opposite sides in the width direction, for example. The unformed portion 21a1 as the positive electrode current collecting portion protrudes from one side of the separator sheets 31 and 32 in the width direction. The unformed portion 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。 The specific form of the electrode body 20 is not limited to the form exemplified here, unless otherwise specified. For example, the sealed battery 10 may be an all-solid-state battery containing a solid electrolyte, and the electrode body may be one used for an all-solid-state 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 unformed portion 21a1 as the positive electrode current collecting portion and the unformed portion 22a1 as the negative electrode current collecting portion, respectively. The internal terminal 12 is attached to the lid 11b and fixed to the external terminal 13. The structure for attaching the internal terminal 12 and the external terminal 13 is common on the positive electrode side and the negative electrode side. A metal such as aluminum or an aluminum alloy is used for the internal terminal 12 on the positive electrode side. For the internal terminal 12 on the negative electrode side, for example, a metal such as copper or a copper alloy is used.

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. FIG. 2 shows a portion where the internal terminal 12 and the external terminal 13 are attached to the lid 11b of the battery case 11.
Here, as shown in FIG. 2, the sealed battery 10 includes a lid 11b 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 11b is formed with a mounting hole 11b1 (see FIG. 2) for mounting the internal terminal 12 and the external terminal 13. The lid 11b is formed with a mounting hole 11b1 for mounting the internal terminal 12 and the external terminal 13 on the positive electrode side, and a mounting hole 11b1 for mounting the internal terminal 12 and the external terminal 13 on the negative electrode side, respectively. It is 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 overlapped 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. Further, in this embodiment, as shown in FIG. 1, a 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 a current is input or output during charging and 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。 Here, the insulating members 14 and 15 are insulating members interposed between the internal terminals 12 and the external terminals 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 11b and the internal terminal 12. The sealing property of the mounting 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 a required elasticity. For the gasket 14, for example, a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (which may also be 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 tubular portion 14a, a flange portion 14b, an enclosure portion 14c, and a receiving portion 14d. The tubular portion 14a is a portion that protrudes from the flange portion 14b and is a portion that is mounted on the inner peripheral surface of the mounting hole 11b1 of the lid 11b. As shown in FIG. 2, the shaft portion 12b of the internal terminal 12 is mounted on the tubular portion 14a. The flange portion 14b extends from one end of the tubular portion 14a along the radial direction, and is a plate-shaped portion attached to the inner side 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 cylinder portion 14a. The receiving portion 14d is provided on the lower surface of the gasket 14. The receiving portion 14d has a recess corresponding to the shape of the base portion 12a 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 arranged outside the lid 11b and insulates the lid 11b from the external terminal 13 and the connection terminal 16. The insulator 15 is made of a resin member. For the insulator 15, for example, polypropylene (which may also be referred to as PP), polyethylene (which may also be referred to as PE), or polyphenylene sulfide resin (which may also be referred to as PPS) can be used. As shown in FIG. 2, the insulator 15 is formed with an insertion hole 15a through which the shaft portion 12b 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 may be interposed between the internal terminal 12 and the external terminal 13 and the lid 11b as a battery case component. From this point of view, the insulating members 14 and 15 are not limited to the form shown in FIG. 2, and may be composed of one member. Further, the insulating members 14 and 15 may be further composed of 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 therebetween. As shown in FIG. 1, the second base portion 12a is provided with a mounting piece 12c extending inside the battery case 11. The positive electrode current collector 21a1 is attached to the attachment piece 12c of the internal terminal 12 on the positive electrode side. The 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 into the mounting hole 11b1 of the lid 11b with the gasket 14 as an insulating member and the insulator 15 interposed therebetween. There is. The shaft portion 12b is further inserted into the insertion hole 13b 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 expanded 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 portion 12d is welded to the peripheral edge portion 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 cap portion 12d excluding the welded portion 12e (see FIG. 2).
As shown in FIG. 3, the outer peripheral edge 12d1 of the cap portion 12d is slightly above the first base portion 13a of the external terminal 13 except for the welded portion 12e.

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, the height a of the cap portion 12d at the position where the first base portion 13a of the external terminal 13 and the cap portion 12d are in contact with each other except for the welded portion 12e is 0.1 mm <a <0.4 mm. Is. Here, the height a of the shade portion 12d can also 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 and the cap portion 12d are in contact with the tip of the outer peripheral edge of the cap portion 12d is 0.1 mm <b <0. It is 2 mm. Here, the distance b may also be referred to as an "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 point between the internal terminal 12 and the external terminal 13 is large, and the variation in the welding area is small. Therefore, the reliability of the continuity between the internal terminal 12 and the external terminal 13 is high. Here, the welded area can be evaluated by the area of one welded portion between the internal terminal 12 and the external terminal 13. The welded area may be evaluated, for example, by the area of the welded portion formed on the first base portion 13a. The dimensional relationship between the edge height a of the cap portion 12d and the edge length b is such that after the cap portion 12d is welded to the first base portion 13a, for example, the caps excluding the welded portions 12e, respectively. It can be evaluated by the arithmetic mean in the circumferential direction of part 12d. Therefore, there may be a portion of the outer peripheral edge 12d1 of the cap portion 12d in the circumferential direction that does not satisfy the above relationship. Further, the above dimensional relationship may be evaluated, for example, by the arithmetic mean of the peripheral portion of the welded portion 12e in the circumferential direction of the cap portion 12d.

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 placed on the peripheral edge of the insertion hole 13b of the external terminal 13. Close. At this time, in the cap portion 12d formed, 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. Then, the outer peripheral edge of the cap portion 12d may be welded to the outer terminal 13 in a part in the circumferential direction. In this case, since the edge height a is not too high and the edge length b is moderately long, the heat capacity (also referred to as “heat mass”) of the outer peripheral edge of the cap portion 12d to be welded can be suppressed to a small size. Moreover, the amount of molten metal increases. As a result, the welding area at one welding point between the internal terminal 12 and the external terminal 13 becomes large, and the variation in the welding area becomes small. Then, the reliability of the continuity between 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 12b of the internal terminal 12 is crimped to the peripheral edge portion of the insertion hole 13b of the external terminal 13. As shown in FIG. 4, the shaft portion 12b of the internal terminal 12 protrudes from the insertion hole 13b of the external terminal 13 before being crimped to the peripheral edge portion of the insertion hole 13b 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 edge of the insertion hole 13b of the external terminal 13 In the shape before being crimped, the height at 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 of pushing down the tool 40 (also referred to as bottom dead center) is reduced. It is good to set it low. As a result, the edge height a does not become too high, and the edge length b becomes moderately long. In this way, by adjusting the amount of protrusion of the shaft portion 12b of the internal terminal 12 before crimping and the amount of the tool pushing down the shaft portion 12b, 0.1 mm <a <0.4 mm and 0.1 mm < A cap portion 12d having b <0.2 mm can be stably obtained.

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 present inventor adjusts the amount of protrusion of the shaft portion 12b of the internal terminal 12 before crimping and the amount of the tool pushing down the shaft portion 12b to create a cap portion 12d having different edge height a and edge length b. Various forms were formed, and the outer peripheral edge of the cap portion 12d was laser-welded under certain conditions to evaluate the welded area.
As a result, when the edge height a of the cap portion 12d before welding is 0.1 mm <a <0.4 mm and the edge length b is 0.1 mm <b <0.2 mm, 1. It was found that a conduction area of 0 mm 2 or more was stably secured, the welding area was large, and the variation was small and stable. In this way, by setting the edge height a of the cap portion 12d before welding to 0.1 mm <a <0.4 mm and the edge length b to be 0.1 mm <b <0.2 mm, the internal terminal is formed. It becomes easy to obtain a sealed battery 10 having high reliability regarding the continuity between the 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 12b of the internal terminal 12 is crimped to the peripheral edge portion of the insertion hole 13b of the external terminal 13. At this time, it is assumed that the edge height a and the edge length b of the formed cap portion 12d have a relationship of 0.1 mm <a <0.4 mm and 0.1 mm <b <0.2 mm. good. Then, the outer peripheral edge of the cap portion 12d may be welded to the outer terminal 13 in a part in the circumferential direction. As a result, a sealed battery 10 having a large welding area, small variation, and high reliability in conduction between the internal terminal 12 and the external terminal 13 can be obtained. Further, from the viewpoint of ensuring the continuity between the internal terminal 12 and the external terminal 13, the number of welding points for securing a sufficient welding area can be reduced. In addition, the welding output (laser output in the case of laser welding) required to secure the welding area can be suppressed to a low level. In this way, the cycle time required to produce 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 with the gasket 14 and the insulator 15 interposed in the lid 11b, and the tip of the shaft portion 12b of the internal terminal 12 is placed on the peripheral edge of the insertion hole 13b of the external terminal 13. Squeeze. At this time, in the outer peripheral edge 12d1 of the cap portion 12d formed, the edge height a and the edge length b of the cap portion 12d are approximately 0.1 mm <a <0.4 mm and the edge length b is approximately 0.1 mm <a <0.4 mm before welding. It is preferable that the relationship is 0.1 mm <b <0.2 mm. Then, the outer peripheral edge of the cap portion 12d may be welded to the outer terminal 13 in a part in the circumferential direction. As a result, the welding area at one welding point between the internal terminal 12 and the external terminal 13 is large, and the variation in the welding area is small. Then, the reliability of the continuity between 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 portion 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 amount of protrusion of the tip of the shaft portion 12b of the internal terminal 12 crimped to the peripheral edge of the insertion hole 13b of the external terminal 13, and the amount by which the tool 40 is pushed down when the tip of the shaft portion 12b is crimped (“of the tool”. It is also called "lower death amount".) It is good that it is adjusted.
The dimensional relationship between the edge height a and the edge length b of the cap portion 12d, the shaft portion 12b of the internal terminal 12 for obtaining 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 bottom death of the tool 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。 The sealed batteries proposed here have been described in various ways. Unless otherwise specified, the embodiments of the sealed battery mentioned 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 10 Sealed battery 11 Battery case 11a Case body 11b Lid 11b1 Mounting hole 12 Internal terminal 12a Base part (second base part)
12b Shaft part 12c Mounting piece 12d Cap part 12d1 Outer peripheral edge 12e Welded part 13 External terminal 13a Base part (first base part)
13b Insertion hole 14 Gasket (insulating member)
14a Cylinder 14b Brim 14c Enclosure 14d Receiving 15 Insulator (insulating member)
15a Insertion hole 16 Connection terminal 20 Electrode body 21 Positive electrode sheet 21a Positive current collector foil 21a1 Unformed portion (positive electrode current collector)
21b Positive electrode active material layer 22 Negative electrode sheet 22a Negative electrode current collector foil 22a1 Unformed portion (negative electrode current collector)
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、
前記笠部の外周縁から前記笠部の径方向に見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。 Battery case parts with mounting holes and
With internal terminals
With external terminals
It is provided with at least one insulating member interposed between the internal terminal and the external terminal and the battery case component.
The external terminal has a first base portion that is superposed on the outside of the battery case component with the insulating member interposed therebetween.
It is provided with an insertion hole formed in the first base portion.
The internal terminal is
A second base portion stacked inside the battery case component with the insulating member interposed therebetween.
It is provided with a shaft portion that protrudes from the second base portion, is inserted into the mounting 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 expanded in a disk shape along the peripheral edge portion of the insertion hole of the external terminal.
A part of the outer peripheral edge of the cap portion is welded to the peripheral edge portion 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 cap portion at a position where the first base portion of the external terminal and the cap portion are in contact with each other when viewed from the outer peripheral edge of the cap portion in the radial direction of the cap portion is 0.1 mm <a <0. .4 mm and
In the radial direction of the cap portion, the distance b from the position where the first base portion of the external terminal and the cap portion contact to the tip of the outer peripheral edge of the cap portion is 0.1 mm <b <0.2 mm. be,
Sealed battery.
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