JP6066204B2 - Manufacturing method of secondary battery - Google Patents

Manufacturing method of secondary battery Download PDF

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JP6066204B2
JP6066204B2 JP2013248120A JP2013248120A JP6066204B2 JP 6066204 B2 JP6066204 B2 JP 6066204B2 JP 2013248120 A JP2013248120 A JP 2013248120A JP 2013248120 A JP2013248120 A JP 2013248120A JP 6066204 B2 JP6066204 B2 JP 6066204B2
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terminal
external terminal
internal terminal
caulking
protrusion
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JP2015106501A (en
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浩 永田
浩 永田
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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

Description

本発明は、二次電池の製造方法に関し、二次電池に用いられる外部端子と内部端子とをかしめて接合する技術に関する。   The present invention relates to a method for manufacturing a secondary battery, and relates to a technique for caulking and joining an external terminal and an internal terminal used in the secondary battery.

特許文献１には、リベット状の内部端子のリベット部をケース及び外部端子を貫通させた状態で、外部端子側に突出する前記リベット部の突出部をかしめることにより内部端子を外部端子にかしめ接合するとともに、ケースと各端子間に配置されるシール部材を押圧して圧縮することで、ケースの端子取り出し部におけるシール性を確保する技術が開示されている。   In Patent Document 1, the internal terminal is caulked to the external terminal by caulking the protruding portion of the rivet portion protruding to the external terminal side with the rivet portion of the rivet-shaped internal terminal passing through the case and the external terminal. A technique is disclosed in which, while joining, a sealing member disposed between the case and each terminal is pressed and compressed to ensure the sealing performance at the terminal lead-out portion of the case.

特開２０１０−２８２８４８号公報JP 2010-282848 A

内部端子のリベット部をかしめて外部端子に固相接合する場合、外部端子側の接合面に酸化皮膜が存在することから、所望の接合強度を出して、導通を保証するために、かしめた後にレーザ溶接で溶融接合を追加していた。   When caulking the rivet part of the internal terminal and solid-phase joining to the external terminal, there is an oxide film on the joint surface on the external terminal side, so after giving the desired joining strength and ensuring conduction, A fusion weld was added by laser welding.

本発明は、ケース内部から取り出される内部端子の先端部を、外部端子を貫通した状態でかしめることにより、前記内部端子を外部端子に接合する工程を含む二次電池の製造方法であって、前記内部端子の先端部をかしめる前に、前記外部端子における内部端子が貫通する部位の周囲に突起を設け、前記内部端子の先端部をかしめる際に、該かしめられて変形する内部端子の先端部を前記突起に側方から接触させ、該突起を側方に向けて塑性変形させる。   The present invention is a method of manufacturing a secondary battery including a step of joining the internal terminal to the external terminal by caulking the tip of the internal terminal taken out from the inside of the case in a state of penetrating the external terminal, Before caulking the tip of the internal terminal, a protrusion is provided around the portion of the external terminal through which the internal terminal penetrates, and when caulking the tip of the internal terminal, the internal terminal deformed by caulking The tip is brought into contact with the protrusion from the side, and the protrusion is plastically deformed toward the side.

本発明によれば、内部端子の外部端子に対するかしめ接合時に、外部端子側の接合面に新生表面を露出させることで、前記接合面の酸化皮膜を除去して、接合強度を大きくすることができる。なお、ここでの接合面とは、外部端子と内部端子の両方の表面のうち、接合された後の表面のことを言う。   According to the present invention, at the time of caulking and joining the internal terminal to the external terminal, by exposing the new surface to the joint surface on the external terminal side, it is possible to remove the oxide film on the joint surface and increase the joint strength. . In addition, a joining surface here means the surface after joining among the surfaces of both an external terminal and an internal terminal.

二次電池の概略図である。It is the schematic of a secondary battery. 内部端子及び外部端子とケースとの接合部を示す図である。It is a figure which shows the junction part of an internal terminal and an external terminal, and a case. かしめ加工を示す図である。It is a figure which shows a crimping process.

図１に示すように、二次電池１は、ケース２内に充放電要素となる電極体３及び非水電解液等を収納することによって、繰り返し充放電可能な二次電池として構成される。
ケース２の外方には、外部接続用の外部端子４が突出して設けられる。各外部端子４は、絶縁樹脂５を介して絶縁された状態でケース２に固定される。また、外部端子４は、内部端子６によって電極体３と接続されている。内部端子６も同様に絶縁樹脂５及びガスケット７を介してケース２に対して絶縁された状態で固定される。 As shown in FIG. 1, the secondary battery 1 is configured as a secondary battery that can be repeatedly charged and discharged by housing an electrode body 3 serving as a charge / discharge element, a non-aqueous electrolyte, and the like in a case 2.
An external terminal 4 for external connection projects from the outside of the case 2. Each external terminal 4 is fixed to the case 2 in an insulated state via an insulating resin 5. The external terminal 4 is connected to the electrode body 3 by the internal terminal 6. Similarly, the internal terminal 6 is fixed in an insulated state with respect to the case 2 via the insulating resin 5 and the gasket 7.

図２に示すように、内部端子６の一部は、ケース２、ガスケット７、絶縁樹脂５及び外部端子４の一部を貫通した状態でケース２の外方に向けて突出し、その先端部がかしめられて接合されている。このように、内部端子６の一部に接合部１０が形成され、ガスケット７に圧縮力が付与されるとともに、内部端子６と外部端子４が電気的に接続されている。   As shown in FIG. 2, a part of the internal terminal 6 protrudes outward of the case 2 in a state of passing through the case 2, the gasket 7, the insulating resin 5 and a part of the external terminal 4. It is crimped and joined. As described above, the joint portion 10 is formed on a part of the internal terminal 6, a compressive force is applied to the gasket 7, and the internal terminal 6 and the external terminal 4 are electrically connected.

図３に示すように、内部端子６をかしめる際には、かしめ工具２０を用いて、内部端子６の突出部６ａを突出方向から押圧して径方向に拡張させるように変形させる。これにより、押圧方向に圧縮力が付与されるとともに、突出部６ａが外部端子４の貫通孔４ａの径よりも大きい径を有し、外部端子４の表面に沿って貫通孔４ａの周縁部側に延出されるかしめ部２１として形成される。   As shown in FIG. 3, when caulking the internal terminal 6, the caulking tool 20 is used to deform the protruding portion 6 a of the internal terminal 6 so as to be expanded in the radial direction by pressing from the protruding direction. As a result, a compressive force is applied in the pressing direction, and the protruding portion 6 a has a diameter larger than the diameter of the through hole 4 a of the external terminal 4, and the peripheral edge side of the through hole 4 a along the surface of the external terminal 4. It is formed as a caulking portion 21 extending to the surface.

内部端子６の突出部６ａを変形させてかしめ部２１を形成することによって、内部端子６が外部端子４の貫通孔４ａに固定されて、内部端子６と外部端子４が接続される。これとともに、かしめ工具２０による押圧方向に圧縮力が加えられることにより、ガスケット７に圧縮力が作用して、ケース２のシール性が確保される。より厳密には、ケース２の内側面側において、内部端子６が貫通する貫通孔２ａと内部端子６との間に介装されるガスケット７に圧縮力が作用することによってこれらが互いに密着した状態で保持され、シール性が確保される。   By deforming the protruding portion 6 a of the internal terminal 6 to form the caulking portion 21, the internal terminal 6 is fixed to the through hole 4 a of the external terminal 4, and the internal terminal 6 and the external terminal 4 are connected. At the same time, a compressive force is applied in the pressing direction by the caulking tool 20, whereby the compressive force acts on the gasket 7 and the sealing performance of the case 2 is ensured. More precisely, on the inner surface side of the case 2, a compression force acts on the gasket 7 interposed between the through hole 2 a through which the internal terminal 6 passes and the internal terminal 6, so that they are in close contact with each other. The sealability is secured.

図３（ａ）に示すように、かしめ対象物である内部端子６の突出部６ａが貫通する部位であり、被かしめ対象物である外部端子４の接合部となる貫通孔４ａの周囲には、突起加工により突起１１が設けられている。突起１１は、外部端子４の外側面から外方に向けて突出して設けられる凸状部である。突起１１は、例えば、外部端子４の貫通孔４ａの内周縁部の一部を外方側に立ち上げて突出させることにより成形される。   As shown to Fig.3 (a), it is a site | part through which the protrusion part 6a of the internal terminal 6 which is a crimping target object penetrates, and the circumference | surroundings of the through-hole 4a used as the junction part of the external terminal 4 which is a crimping target object are The protrusion 11 is provided by the protrusion processing. The protrusion 11 is a convex portion that protrudes outward from the outer surface of the external terminal 4. The protrusion 11 is formed by, for example, raising a part of the inner peripheral edge of the through hole 4a of the external terminal 4 to protrude outward.

図３（ｂ）に示すように、内部端子６の突出部６ａをかしめて変形させる際に、突出部６ａは突起１１の側方に接触した状態を維持しつつ貫通孔４ａの外周側へ延出するため、突起１１の内側面に側方（水平方向）からの押圧力がかかる。突起１１は、この押圧力を受けて外方側（貫通孔４ａの外周側）に向けて塑性変形する。このとき、突起１１が塑性変形して外方側へ移動することによって、外部端子４における、もともと突起１１が存在していた部分の表面に延性破面が形成されて、新生表面１２が露出する。
そして、図３（ｃ）に示すように、かしめ加工が完了してかしめ部２１が形成された後、もともと突起１１が成形されていた外部端子４の表面は、塑性流動によって新生表面１２となり、外部端子４と内部端子６の接合面が全体に亘って新生表面１２となる。 As shown in FIG. 3B, when the projecting portion 6a of the internal terminal 6 is caulked and deformed, the projecting portion 6a extends to the outer peripheral side of the through hole 4a while maintaining the state of being in contact with the side of the projection 11. Therefore, a pressing force from the side (horizontal direction) is applied to the inner side surface of the protrusion 11. The protrusion 11 receives this pressing force and plastically deforms toward the outer side (the outer peripheral side of the through hole 4a). At this time, when the protrusion 11 is plastically deformed and moves outward, a ductile fracture surface is formed on the surface of the external terminal 4 where the protrusion 11 originally existed, and the new surface 12 is exposed. .
Then, as shown in FIG. 3C, after the caulking process is completed and the caulking portion 21 is formed, the surface of the external terminal 4 from which the protrusion 11 was originally formed becomes a new surface 12 by plastic flow, The joint surface of the external terminal 4 and the internal terminal 6 becomes the new surface 12 throughout.

以上のように、内部端子６をかしめ加工して、外部端子４に接合する際に、予め外部端子４の接合部となる部位に設けられた突起１１を塑性変形させて移動させつつ、内部端子６を外部端子４に固相接合させることで、突起１１の塑性流動に伴って外部端子４の表面に露出する新生表面１２と内部端子６が接合することとなる。このため、新生表面１２に発生する酸化皮膜量を抑えながら接合することができ、内部端子６と外部端子４の間の接合強度を向上できる。   As described above, when the internal terminal 6 is caulked and joined to the external terminal 4, the protrusion 11 provided in a portion that becomes the joint portion of the external terminal 4 is plastically deformed and moved in advance. By solid-phase joining 6 to the external terminal 4, the new surface 12 exposed on the surface of the external terminal 4 and the internal terminal 6 are joined together with the plastic flow of the protrusion 11. For this reason, it can join, suppressing the amount of oxide films which generate | occur | produces on the new surface 12, and the joining strength between the internal terminal 6 and the external terminal 4 can be improved.

１：二次電池、２：ケース、４：外部端子、４ａ：貫通孔、６：内部端子、６ａ：突出部（内部端子の先端部）、１０：接合部、１１：突起、１２：新生表面、２１：かしめ部   1: secondary battery, 2: case, 4: external terminal, 4a: through-hole, 6: internal terminal, 6a: protruding portion (tip portion of internal terminal), 10: junction, 11: protrusion, 12: new surface , 21: Caulking part

Claims (1)

ケース内部から取り出される内部端子の先端部を、外部端子を貫通した状態でかしめることにより、前記内部端子を外部端子に接合する工程を含む二次電池の製造方法であって、
前記内部端子の先端部をかしめる前に、前記外部端子における内部端子が貫通する部位の周囲に突起を設け、
前記内部端子の先端部をかしめる際に、該かしめられて変形する内部端子の先端部を前記突起に側方から接触させ、該突起を側方に向けて塑性変形させることを特徴とする二次電池の製造方法。 A method for manufacturing a secondary battery including a step of joining the internal terminal to the external terminal by caulking the tip of the internal terminal taken out from the inside of the case in a state of penetrating the external terminal,
Before caulking the tip of the internal terminal, a protrusion is provided around a portion of the external terminal through which the internal terminal passes,
When crimping the tip of the internal terminal, the tip of the crimped internal terminal is brought into contact with the projection from the side, and the projection is plastically deformed toward the side. A method for manufacturing a secondary battery.
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JP6394983B2 (en) * 2015-05-26 2018-09-26 トヨタ自動車株式会社 Automotive battery terminal structure
KR102470495B1 (en) 2015-11-24 2022-11-24 삼성에스디아이 주식회사 Secondary Battery and Method for Manufacturing The Same
US10593926B2 (en) 2016-04-25 2020-03-17 Gs Yuasa International Ltd. Energy storage device including a rigidity changing part disposed in a vicinity of a joint portion of a first member and a second member
JP6770690B2 (en) * 2017-08-10 2020-10-21 トヨタ自動車株式会社 Sealed battery
JP6954016B2 (en) * 2017-11-08 2021-10-27 トヨタ自動車株式会社 Power storage device and manufacturing method of power storage device
JP7064695B2 (en) * 2017-12-15 2022-05-11 トヨタ自動車株式会社 Sealed battery, assembled battery, manufacturing method of sealed battery and manufacturing method of assembled battery
JP7355506B2 (en) * 2019-02-21 2023-10-03 三洋電機株式会社 secondary battery
JP7236033B2 (en) * 2019-10-09 2023-03-09 トヨタ自動車株式会社 sealed battery

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JP5168007B2 (en) * 2008-07-25 2013-03-21 トヨタ自動車株式会社 Battery, vehicle, battery-mounted device, and battery manufacturing method
JP5618123B2 (en) * 2009-06-04 2014-11-05 トヨタ自動車株式会社 Sealed battery
JP5976340B2 (en) * 2012-02-29 2016-08-23 三洋電機株式会社 Method for manufacturing prismatic secondary battery
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