JP5596647B2 - Battery case lid manufacturing method - Google Patents

Battery case lid manufacturing method Download PDF

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JP5596647B2
JP5596647B2 JP2011206190A JP2011206190A JP5596647B2 JP 5596647 B2 JP5596647 B2 JP 5596647B2 JP 2011206190 A JP2011206190 A JP 2011206190A JP 2011206190 A JP2011206190 A JP 2011206190A JP 5596647 B2 JP5596647 B2 JP 5596647B2
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punch
folding
thin plate
metal plate
forming
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JP2012104473A (en
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隆幸 早出
幸徳 杉山
伸一 野村
正人 小林
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Nippon Light Metal Co Ltd
SOODE NAGANO CO Ltd
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Nippon Light Metal Co Ltd
SOODE NAGANO CO Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Gas Exhaust Devices For Batteries (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

本発明は、二次電池で用いられる電池ケース用蓋に関する。   The present invention relates to a battery case lid used in a secondary battery.

二次電池は、例えば、内部に電解質を備えた電池ケースと電池ケースの開口を塞ぐ電池ケース用蓋で構成されている。電池ケース用蓋は、電池ケースに溶接される基板部と、電解質に異常が発生した場合に電池ケース内の内圧を開放するための防爆弁と、を主に備えている。防爆弁は、基板部よりも薄く成形されており、所定以上の内圧が作用した際に、破断するようになっている。   The secondary battery includes, for example, a battery case provided with an electrolyte therein and a battery case lid that closes the opening of the battery case. The battery case lid mainly includes a substrate portion welded to the battery case, and an explosion-proof valve for releasing the internal pressure in the battery case when an abnormality occurs in the electrolyte. The explosion-proof valve is formed thinner than the substrate portion, and is broken when an internal pressure exceeding a predetermined level is applied.

従来、この防爆弁を成形する場合、例えば、基板部と防爆弁とを溶接で接合していた。しかし、基板部と防爆弁とを溶接で接合すると、接合部分の厚さを一定にすることが困難になるため、内圧を開放する作動圧を一定にすることができないという問題があった。また、溶接では接合作業が煩雑になるという問題があった。   Conventionally, when molding this explosion-proof valve, for example, the substrate portion and the explosion-proof valve are joined by welding. However, when the substrate portion and the explosion-proof valve are joined by welding, it is difficult to make the thickness of the joined portion constant, and thus there is a problem that the operating pressure for releasing the internal pressure cannot be made constant. In addition, there has been a problem that welding is complicated in welding.

特許文献１には、一枚の金属板をプレス加工して、防爆弁を成形する方法が記載されている。特許文献１に係る成形方法は、一枚の金属板にコイニングを行って、基板部よりも薄い薄板部を成形した後、薄板部の周囲に溝部を成形する工程が記載されている。この溝部は、所定以上の内圧を受けた際に、確実に破断するよう薄板部よりもさらに薄肉に成形されている。また、特許文献１に係る成形方法では、溝部を成形した後に、加工硬化した防爆弁の作動圧を整えるために、焼鈍工程を行う旨が記載されている。   Patent Document 1 describes a method of forming an explosion-proof valve by pressing a single metal plate. The forming method according to Patent Document 1 describes a step of coining a single metal plate to form a thin plate portion thinner than the substrate portion and then forming a groove portion around the thin plate portion. The groove is formed to be thinner than the thin plate so as to be surely broken when subjected to an internal pressure of a predetermined level or more. Moreover, in the shaping | molding method which concerns on patent document 1, after shaping | molding a groove part, in order to adjust the working pressure of the work-hardened explosion-proof valve, it describes describing performing an annealing process.

特許３２２２４１８号公報Japanese Patent No. 3224418

しかし、金属板にコイニング等のプレス加工を行って薄板部を成形した後、この薄板部に溝部を形成する場合、被成形金属板（ワーク）が加工硬化しているため、溝部を成形する際に割れてしまうという問題があった。特に、二次電池の小型化、薄型化が進んでいる近年においては、従来の製造方法ではこのようなニーズに対応できないという問題があった。また、特許文献１に係る成形方法では、被成形金属板が加工硬化しているため、焼鈍工程を行って被成形金属板を柔らかくして防爆弁の作動圧を調整しなければならない。そのため、製造作業が煩雑になるという問題があった。   However, after forming a thin plate portion by performing press processing such as coining on the metal plate, when forming the groove portion in this thin plate portion, the metal plate (work) to be formed is work hardened, so when forming the groove portion There was a problem of cracking. In particular, in recent years when secondary batteries are becoming smaller and thinner, there is a problem that conventional manufacturing methods cannot meet such needs. Moreover, in the shaping | molding method concerning patent document 1, since the to-be-formed metal plate is work-hardened, an annealing process must be performed to soften the to-be-formed metal plate and adjust the operating pressure of the explosion-proof valve. Therefore, there has been a problem that the manufacturing work becomes complicated.

このような観点から、本発明は、被成形金属板の加工硬化を抑制するとともに、容易に製造することができる電池ケース用蓋の製造方法を提供することを課題とする。また、製造が容易であるとともに、防爆弁の周囲を補強することができる電池ケース用蓋を提供することを課題とする。   From such a viewpoint, an object of the present invention is to provide a method for manufacturing a battery case lid that can be easily manufactured while suppressing work hardening of a metal sheet to be formed. Another object of the present invention is to provide a battery case lid that can be easily manufactured and can reinforce the periphery of the explosion-proof valve.

このような課題を解決する本発明は、防爆弁を備えた電池ケース用蓋を製造する方法であって、凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部及び当該薄板部から立ち上がる筒状壁部を成形する延し成形工程と、前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された前記筒状壁部を折り返す折返し工程と、前記薄板部に溝部を成形する溝部成形工程と、を含み、前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部及び前記筒状壁部を成形するとともに、前記金属板と前記延し成形用パンチの外周側面の先端との間に隙間が生じるまで前記延し成形用パンチを押し込むことを特徴とする。 The present invention for solving such a problem is a method of manufacturing a battery case lid provided with an explosion-proof valve, which is formed by extending from one side of a metal plate disposed on an extending forming die having a recess. An extension molding step for forming a thin plate portion constituting the explosion-proof valve and a cylindrical wall portion rising from the thin plate portion by pushing a punch for use, and an outer diameter of the thin plate portion after the extension molding step An outer diameter folding punch presses the thin plate portion from the other side of the metal plate, folds the cylindrical wall portion formed around the thin plate portion, and forms a groove portion in the thin plate portion. A groove portion forming step, wherein an inner diameter of the concave portion is larger than an outer diameter of the extension forming punch, and in the extension forming step, the metal plate is not restrained. Push in the punch, the bottom of the recess and the extension By rolling the metal plate with the pressing surface of the forming punch, the thin plate portion and the cylindrical wall portion are formed, and between the metal plate and the tip of the outer peripheral side surface of the extended forming punch. The extended forming punch is pushed in until a gap is formed.

かかる製造方法によれば、金属板を拘束しない状態で、延し成形用パンチで金属板を押し込むため、成形時の歪みの導入量が少なくなり被成形金属板の加工硬化を抑制することができる。これにより、薄板部に溝部を成形する際に、薄板部が割れるのを防ぐことができる。また、金属板に延し成形用パンチを押し込むだけでよいため、薄板部を成形する際の成形作業が容易である。また、被成形金属板の加工硬化を抑制できるため、焼鈍工程を省略することが可能となる。これにより、作業工程を少なくすることができる。また、折返し工程によれば筒状壁部の高さを低くできるため、電池ケース用蓋の高さを低くすることができる。 According to this manufacturing method, since the metal plate is pushed in with the extended forming punch without restraining the metal plate, the amount of distortion introduced during forming is reduced, and work hardening of the metal plate to be formed can be suppressed. . Thereby, when shape | molding a groove part in a thin plate part, it can prevent that a thin plate part cracks. Further, since it is only necessary to extend the metal plate and push the forming punch, the forming operation when forming the thin plate portion is easy. Moreover, since the work hardening of the metal plate to be formed can be suppressed, the annealing step can be omitted. Thereby, the work process can be reduced. Moreover, since the height of a cylindrical wall part can be made low according to a folding | turning process, the height of the battery case cover can be made low.

また、本発明は、防爆弁を備えた電池ケース用蓋を製造する方法であって、凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部及び当該薄板部から立ち上がる筒状壁部を成形する延し成形工程と、前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された前記筒状壁部を折り返す折返し工程と、前記折返し工程の後に、前記折返し工程で前記筒状壁部が折り返されることで成形された湾曲部を、折重ね用パンチで前記金属板の他方側から押圧し、前記湾曲部を折り重ねる折重ね工程と、前記薄板部に溝部を成形する溝部成形工程と、を含み、前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部及び前記筒状壁部を成形するとともに、前記金属板と前記延し成形用パンチの外周側面の先端との間に隙間が生じるまで前記延し成形用パンチを押し込むことを特徴とする。 Further, the present invention is a method of manufacturing a battery case lid provided with an explosion-proof valve, which is formed by pressing a forming punch extending from one side of a metal plate disposed on an extending forming die provided with a recess. An extension molding step for molding the thin plate portion constituting the explosion-proof valve and the cylindrical wall portion rising from the thin plate portion, and for turning the outer diameter smaller than the outer diameter of the thin plate portion after the extension molding step A punching step of pressing the thin plate portion from the other side of the metal plate and folding back the cylindrical wall portion formed around the thin plate portion, and after the folding step, the tubular shape in the folding step A bending step in which the curved portion formed by folding the wall portion is pressed from the other side of the metal plate with a folding punch, and the bending portion is folded, and the groove portion molding in which the groove portion is formed in the thin plate portion. And the inner diameter of the recess is the front The outer forming punch has an outer diameter larger than the outer diameter. In the extending forming step, the extending punch is pushed in without restraining the metal plate, and the bottom surface of the recess and the extending punch are pressed. The metal plate is rolled with the pressing surface to form the thin plate portion and the cylindrical wall portion, and a gap is formed between the metal plate and the tip of the outer peripheral side surface of the extended forming punch. The extended forming punch is pushed in until the end.

かかる製造方法によれば、金属板を拘束しない状態で、延し成形用パンチで金属板を押し込むため、成形時の歪みの導入量が少なくなり被成形金属板の加工硬化を抑制することができる。これにより、薄板部に溝部を成形する際に、薄板部が割れるのを防ぐことができる。また、金属板に延し成形用パンチを押し込むだけでよいため、薄板部を成形する際の成形作業が容易である。また、被成形金属板の加工硬化を抑制できるため、焼鈍工程を省略することが可能となる。これにより、作業工程を少なくすることができる。また、折返し工程によれば筒状壁部の高さを低くできるため、電池ケース用蓋の高さを低くすることができる。また、折重ね工程によれば、筒状壁部の高さをより低くできるため、電池ケース用蓋の高さをより低くすることができる。また、防爆弁の周囲に、金属板を折り重ねて成形された肉厚部分ができるため、防爆弁を補強することができる。 According to this manufacturing method , since the metal plate is pushed in with the extended forming punch without restraining the metal plate, the amount of distortion introduced during forming is reduced, and work hardening of the metal plate to be formed can be suppressed. . Thereby, when shape | molding a groove part in a thin plate part, it can prevent that a thin plate part cracks. Further, since it is only necessary to extend the metal plate and push the forming punch, the forming operation when forming the thin plate portion is easy. Moreover, since the work hardening of the metal plate to be formed can be suppressed, the annealing step can be omitted. Thereby, the work process can be reduced. Moreover, since the height of a cylindrical wall part can be made low according to a folding | turning process, the height of the battery case cover can be made low. In addition, according to the folding process, the height of the cylindrical wall portion can be further reduced, so that the height of the battery case lid can be further reduced. Further, since the thick portion formed by folding the metal plate is formed around the explosion-proof valve, the explosion-proof valve can be reinforced.

また、本発明は、防爆弁を備えた電池ケース用蓋を製造する方法であって、凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部を成形する延し成形工程と、前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された筒状壁部を折り返す折返し工程と、前記薄板部に溝部を成形する溝部成形工程と、を含み、前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部を成形することを特徴とする。 Further, the present invention is a method of manufacturing a battery case lid provided with an explosion-proof valve, which is formed by pressing a forming punch extending from one side of a metal plate disposed on an extending forming die provided with a recess. An extension forming step for forming the thin plate portion constituting the explosion-proof valve, and a folding punch having an outer diameter smaller than the outer diameter of the thin plate portion after the extension forming step, from the other side of the metal plate A folding step of pressing the thin plate portion and folding a cylindrical wall portion formed around the thin plate portion; and a groove portion forming step of forming a groove portion in the thin plate portion, and the inner diameter of the concave portion is The outer diameter of the punch for punching is larger than the outer diameter of the punch for molding. By rolling the metal plate with the pressing surface, Characterized by shaping the part.

かかる製造方法によれば、金属板を拘束しない状態で、延し成形用パンチで金属板を押し込むため、成形時の歪みの導入量が少なくなり被成形金属板の加工硬化を抑制することができる。これにより、薄板部に溝部を成形する際に、薄板部が割れるのを防ぐことができる。また、金属板に延し成形用パンチを押し込むだけでよいため、薄板部を成形する際の成形作業が容易である。また、被成形金属板の加工硬化を抑制できるため、焼鈍工程を省略することが可能となる。これにより、作業工程を少なくすることができる。また、折返し工程によれば筒状壁部の高さを低くできるため、電池ケース用蓋の高さを低くすることができる。According to this manufacturing method, since the metal plate is pushed in with the extended forming punch without restraining the metal plate, the amount of distortion introduced during forming is reduced, and work hardening of the metal plate to be formed can be suppressed. . Thereby, when shape | molding a groove part in a thin plate part, it can prevent that a thin plate part cracks. Further, since it is only necessary to extend the metal plate and push the forming punch, the forming operation when forming the thin plate portion is easy. Moreover, since the work hardening of the metal plate to be formed can be suppressed, the annealing step can be omitted. Thereby, the work process can be reduced. Moreover, since the height of a cylindrical wall part can be made low according to a folding | turning process, the height of the battery case cover can be made low.

また、本発明は、防爆弁を備えた電池ケース用蓋を製造する方法であって、凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部を成形する延し成形工程と、前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された筒状壁部を折り返す折返し工程と、前記折返し工程の後に、前記折返し工程で前記筒状壁部が折り返されることで成形された湾曲部を、折重ね用パンチで前記金属板の他方側から押圧し、前記湾曲部を折り重ねる折重ね工程と、前記薄板部に溝部を成形する溝部成形工程と、を含み、前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部を成形することを特徴とする。 Further, the present invention is a method of manufacturing a battery case lid provided with an explosion-proof valve, which is formed by pressing a forming punch extending from one side of a metal plate disposed on an extending forming die provided with a recess. An extension forming step for forming the thin plate portion constituting the explosion-proof valve, and a folding punch having an outer diameter smaller than the outer diameter of the thin plate portion after the extension forming step, from the other side of the metal plate The bending formed by pressing the thin plate portion and folding the cylindrical wall portion formed around the thin plate portion, and folding the cylindrical wall portion in the folding step after the folding step. Including a folding step of folding the curved portion by pressing the portion from the other side of the metal plate with a folding punch, and a groove forming step of forming a groove in the thin plate portion, and the inner diameter of the recess is , Larger than the outer diameter of the extension molding punch And in the extension forming step, the extension punch is pushed in without restraining the metal plate, and the metal plate is rolled by the bottom surface of the recess and the pressing surface of the extension punch. The thin plate portion is formed.

かかる製造方法によれば、金属板を拘束しない状態で、延し成形用パンチで金属板を押し込むため、成形時の歪みの導入量が少なくなり被成形金属板の加工硬化を抑制することができる。これにより、薄板部に溝部を成形する際に、薄板部が割れるのを防ぐことができる。また、金属板に延し成形用パンチを押し込むだけでよいため、薄板部を成形する際の成形作業が容易である。また、被成形金属板の加工硬化を抑制できるため、焼鈍工程を省略することが可能となる。これにより、作業工程を少なくすることができる。また、折返し工程によれば筒状壁部の高さを低くできるため、電池ケース用蓋の高さを低くすることができる。また、折重ね工程によれば、筒状壁部の高さをより低くできるため、電池ケース用蓋の高さをより低くすることができる。また、防爆弁の周囲に、金属板を折り重ねて成形された肉厚部分ができるため、防爆弁を補強することができる。 According to this manufacturing method , since the metal plate is pushed in with the extended forming punch without restraining the metal plate, the amount of distortion introduced during forming is reduced, and work hardening of the metal plate to be formed can be suppressed. . Thereby, when shape | molding a groove part in a thin plate part, it can prevent that a thin plate part cracks. Further, since it is only necessary to extend the metal plate and push the forming punch, the forming operation when forming the thin plate portion is easy. Moreover, since the work hardening of the metal plate to be formed can be suppressed, the annealing step can be omitted. Thereby, the work process can be reduced. Moreover, since the height of a cylindrical wall part can be made low according to a folding | turning process, the height of the battery case cover can be made low. In addition, according to the folding process, the height of the cylindrical wall portion can be further reduced, so that the height of the battery case lid can be further reduced. Further, since the thick portion formed by folding the metal plate is formed around the explosion-proof valve, the explosion-proof valve can be reinforced.

本発明に係る電池ケース用蓋の製造方法によれば、被成形金属板の加工硬化を抑制するとともに電池ケース用蓋を容易に製造することができる。また、本発明に係る電池ケース用蓋によれば、容易に製造できるとともに防爆弁の周囲を補強することができる。   According to the method for manufacturing a battery case cover according to the present invention, it is possible to easily manufacture the battery case cover while suppressing work hardening of the metal sheet to be formed. Moreover, according to the lid | cover for battery cases which concerns on this invention, it can manufacture easily and can reinforce the circumference | surroundings of an explosion-proof valve.

本実施形態に係る電池ケース及び電池ケース用蓋を示す斜視図である。It is a perspective view which shows the battery case and cover for battery cases which concern on this embodiment. 本実施形態に係る電池ケース用蓋を示す図であって、（ａ）は平面図、（ｂ）は断面図である。It is a figure which shows the cover for battery cases which concerns on this embodiment, Comprising: (a) is a top view, (b) is sectional drawing. 本実施形態に係る第一溝部及び第二溝部を示す拡大断面図である。It is an expanded sectional view showing the 1st groove part and the 2nd groove part concerning this embodiment. 本実施形態に係る製造方法を示すフロー図である。It is a flowchart which shows the manufacturing method which concerns on this embodiment. （ａ）〜（ｄ）は、本実施形態に係る延し成形工程を段階的に示す断面図である。(A)-(d) is sectional drawing which shows the extended forming process which concerns on this embodiment in steps. 本実施形態に係る延し成形工程後の被成形金属板を示す断面図である。It is sectional drawing which shows the to-be-formed metal plate after the extending forming process which concerns on this embodiment. 本実施形態に係る第一矯正工程を示す断面図であって、（ａ）は矯正前を示し、（ｂ）は矯正後の被成形金属板を示す。It is sectional drawing which shows the 1st correction process which concerns on this embodiment, Comprising: (a) shows before correction, (b) shows the to-be-shaped metal plate after correction. 本実施形態に係る第二矯正工程を示す断面図であって、（ａ）は矯正前を示し、（ｂ）は矯正後の被成形金属板を示す。It is sectional drawing which shows the 2nd correction process which concerns on this embodiment, Comprising: (a) shows before correction, (b) shows the to-be-shaped metal plate after correction. 本実施形態に係る折返し工程を示す断面図であって、（ａ）は折返し前を示し、（ｂ）は折返し後を示す。It is sectional drawing which shows the folding process based on this embodiment, Comprising: (a) shows before folding, (b) shows after folding. 本実施形態に係る予備折重ね工程を示す断面図であって、（ａ）は予備折重ね前、（ｂ）は予備折重ね後を示す。It is sectional drawing which shows the preliminary folding process which concerns on this embodiment, Comprising: (a) shows before preliminary folding, (b) shows after preliminary folding. 本実施形態に係る本折重ね工程を示す断面図であって、（ａ）は本折重ね前、（ｂ）は本折重ね後を示す。It is sectional drawing which shows the main folding process which concerns on this embodiment, Comprising: (a) is before this folding, (b) shows after this folding. 本実施形態に係る溝部成形工程を示す断面図であって、（ａ）は成形前、（ｂ）は成形後を示す。It is sectional drawing which shows the groove part formation process which concerns on this embodiment, Comprising: (a) is before shaping | molding, (b) shows after shaping | molding. 防爆弁の溝部の変形例を示した拡大断面図である。It is the expanded sectional view which showed the modification of the groove part of an explosion-proof valve. 電池ケース用蓋の第一変形例を示した断面図である。It is sectional drawing which showed the 1st modification of the lid | cover for battery cases. 電池ケース用蓋の第二変形例を示した断面図である。It is sectional drawing which showed the 2nd modification of the lid | cover for battery cases. 電池ケース用蓋の第三変形例を示した断面図である。It is sectional drawing which showed the 3rd modification of the lid | cover for battery cases. 電池ケース用蓋の第四変形例を示した断面図である。It is sectional drawing which showed the 4th modification of the cover for battery cases. 電池ケース用蓋の第五変形例を示した断面図である。It is sectional drawing which showed the 5th modification of the cover for battery cases.

本発明の実施形態について、図面を参照して詳細に説明する。まずは、電池ケース用蓋１の構成について説明する。図１に示すように、本実施形態に係る電池ケース用蓋１は、二次電池で用いられる電池ケースＰの開口Ｑを塞ぐ金属製の板状部材である。電池ケースＰの内部には電解質が充填される。開口Ｑと電池ケース用蓋１とを溶接することにより電池ケースＰを密閉する。なお、説明における上下左右前後は図１の矢印にしたがう。   Embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the battery case lid 1 will be described. As shown in FIG. 1, the battery case lid 1 according to the present embodiment is a metal plate-like member that closes an opening Q of a battery case P used in a secondary battery. The battery case P is filled with an electrolyte. The battery case P is sealed by welding the opening Q and the battery case lid 1. Note that the vertical and horizontal directions in the description follow the arrows in FIG.

電池ケース用蓋１は、図１に示すように、基板部２と、折重ね部３と、防爆弁４とで構成されている。電池ケース用蓋１は、一枚のアルミニウム合金板を加工して成形されている。電池ケース用蓋１の材料は、本実施形態ではアルミニウム合金を用いたが、例えば銅や鉄等の他の金属であってもよい。   As shown in FIG. 1, the battery case lid 1 includes a substrate portion 2, a folded portion 3, and an explosion-proof valve 4. The battery case lid 1 is formed by processing a single aluminum alloy plate. Although the aluminum alloy is used as the material for the battery case lid 1 in the present embodiment, other materials such as copper and iron may be used.

基板部２は、平坦な板状部材であって電池ケースＰの開口Ｑを塞ぐ。基板部２の形状は、開口Ｑに対応して平面視矩形になっている。基板部２の板厚は一定になっており、例えば、１．２ｍｍ〜３．０ｍｍに設定すればよい。基板部２の形状は、開口Ｑの形状に応じて適宜変更が可能である。なお、基板部２には、電極を取り付けるための貫通孔や電解質を注入するための注入孔等が形成されているが図示は省略する。   The substrate part 2 is a flat plate-like member and closes the opening Q of the battery case P. The shape of the substrate portion 2 is a rectangle in plan view corresponding to the opening Q. The board thickness of the substrate unit 2 is constant, and may be set to 1.2 mm to 3.0 mm, for example. The shape of the substrate part 2 can be appropriately changed according to the shape of the opening Q. In addition, although the through-hole for attaching an electrode, the injection hole for inject | pouring electrolyte etc. are formed in the board | substrate part 2, illustration is abbreviate | omitted.

折重ね部３は、図２の（ａ）及び（ｂ）に示すように、基板部２において金属板が三層に折り重なってリング状に成形された部位である。折重ね部３は、防爆弁４の外周の全長に亘って形成されている。折重ね部３は、基板部２よりも厚くなっており、防爆弁４の周囲を保護（補強）している。折重ね部３を構成する金属板の各層の厚さは、下層が最も厚く、上層に向けて徐々に薄くなっている。折重ね部３の厚さは、基板部２よりも肉厚であれば特に制限されないが、本実施形態では基板部２の二倍程度の厚さになっている。折重ね部３は、後記する折重ね工程によって成形される。 As shown in FIGS. 2A and 2B, the folded portion 3 is a portion in which the metal plate is folded into three layers and formed into a ring shape in the substrate portion 2. The folded portion 3 is formed over the entire length of the outer periphery of the explosion-proof valve 4. The folded portion 3 is thicker than the substrate portion 2 and protects (reinforces) the periphery of the explosion-proof valve 4. As for the thickness of each layer of the metal plate constituting the folded portion 3, the lower layer is the thickest and gradually decreases toward the upper layer. The thickness of the folded portion 3 is not particularly limited as long as the substrate 2 by Rimoniku thick, in the present embodiment has a thickness of approximately twice the substrate 2. The folding part 3 is shape | molded by the folding process mentioned later.

防爆弁４は、図２及び図３に示すように、折重ね部３の内部に形成されており、電池ケースＰ内で所定以上の内圧が作用した際に破断して、内圧を開放するための弁である。防爆弁４は、薄板部４１と、薄板部４１にそれぞれ成形された中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５、第二溝部４６とで構成されている。   As shown in FIGS. 2 and 3, the explosion-proof valve 4 is formed inside the folded portion 3, and is broken when an internal pressure exceeding a predetermined level is applied in the battery case P so as to release the internal pressure. The valve. The explosion-proof valve 4 includes a thin plate portion 41, a central convex portion 42, a first relief portion 43, a second relief portion 44, a first groove portion 45, and a second groove portion 46 respectively formed on the thin plate portion 41. .

薄板部４１は、平面視円形状を呈し、基板部２よりも薄く成形されている。薄板部４１の厚さは、内圧を開放する際の作動圧に応じて適宜設定すればよく、例えば、０．１ｍｍ〜１．５ｍｍに設定すればよい。薄板部４１は、基板部２の上面と略同等の高さ位置に形成されている。   The thin plate portion 41 has a circular shape in plan view and is formed thinner than the substrate portion 2. What is necessary is just to set the thickness of the thin plate part 41 according to the working pressure at the time of releasing an internal pressure, for example, what is necessary is just to set to 0.1 mm-1.5 mm. The thin plate portion 41 is formed at a height position substantially equal to the upper surface of the substrate portion 2.

中央凸部４２は、薄板部４１の中央部分に形成されている。中央凸部４２は、平面視円形状を呈し、薄板部４１から上方に向けて突出している。中央凸部４２は、防爆弁４の中央に成形されるとともに上方に突出しているため、電池ケースＰの内圧を受けやすくなっている。   The central convex portion 42 is formed at the central portion of the thin plate portion 41. The central convex portion 42 has a circular shape in a plan view and protrudes upward from the thin plate portion 41. Since the center convex portion 42 is formed at the center of the explosion-proof valve 4 and protrudes upward, it is easy to receive the internal pressure of the battery case P.

第一逃し部４３及び第二逃し部４４は、中央凸部４２の周囲にリング状に形成されており、薄板部４１から上方に向けて突出している。第一逃し部４３及び第二逃し部４４は、防爆弁４の中心と同心になっている。第一逃し部４３は、第二逃し部４４よりも内側に形成されている。第一逃し部４３及び第二逃し部４４は、第一溝部４５及び第二溝部４６を成形する際の余肉（押し退けられた金属）を逃すために成形された部位であるため、第一溝部４５及び第二溝部４６に沿って形成されている。   The first escape portion 43 and the second escape portion 44 are formed in a ring shape around the central convex portion 42 and protrude upward from the thin plate portion 41. The first escape portion 43 and the second escape portion 44 are concentric with the center of the explosion-proof valve 4. The first escape portion 43 is formed inside the second escape portion 44. Since the first relief portion 43 and the second relief portion 44 are portions that are formed to escape the excess wall (the metal that has been pushed away) when the first groove portion 45 and the second groove portion 46 are formed, the first groove portion 45 and the second groove 46 are formed.

逃し部は、本実施形態では二条設けたが設けなくてもよい。また、本実施形態では、二条の溝部（第一溝部４５及び第二溝部４６）が設けられているため、第二溝部４６の外側にも逃し部を設けてもよい。また、逃し部は、本実施形態では、上方に突出させたが、下方に突出させてもよい。   In the present embodiment, two escape portions are provided, but they may not be provided. Moreover, in this embodiment, since the two groove parts (the 1st groove part 45 and the 2nd groove part 46) are provided, you may provide an escape part also in the outer side of the 2nd groove part 46. FIG. Moreover, although the escape part protruded upwards in this embodiment, you may make it protrude below.

第一溝部４５及び第二溝部４６は、図２の（ａ）及び（ｂ）に示すように、薄板部４１の上面にリング状に形成された溝である。第一溝部４５及び第二溝部４６は、防爆弁４の中心と同心になっている。第一溝部４５は、第一逃し部４３と第二逃し部４４との間に形成されており、第二溝部４６は、第二逃し部４４の外側に形成されている。   The first groove portion 45 and the second groove portion 46 are grooves formed in a ring shape on the upper surface of the thin plate portion 41, as shown in FIGS. The first groove 45 and the second groove 46 are concentric with the center of the explosion-proof valve 4. The first groove portion 45 is formed between the first escape portion 43 and the second escape portion 44, and the second groove portion 46 is formed outside the second escape portion 44.

第一溝部４５及び第二溝部４６は、図３に示すように、断面視Ｖ字状に形成されている。つまり、第一溝部４５及び第二溝部４６は、上方に向けて徐々に拡開するようになっている。第一溝部４５及び第二溝部４６が形成された部分は、薄板部４１の他の部位よりもさらに厚さが薄くなっている。これにより、電池ケースＰの内圧を受けると、第一溝部４５及び第二溝部４６の少なくとも一方が破断しやすくなっている。第一溝部４５が形成された部位の薄板部４１の厚さ寸法Ｍ１及び第二溝部４６が形成された部位の薄板部４１の厚さ寸法Ｍ２は、設定する作動圧に応じて適宜設定すればよい。   As shown in FIG. 3, the first groove 45 and the second groove 46 are formed in a V shape in sectional view. That is, the first groove portion 45 and the second groove portion 46 are gradually expanded upward. The portion where the first groove portion 45 and the second groove portion 46 are formed is thinner than other portions of the thin plate portion 41. Thereby, when the internal pressure of the battery case P is received, at least one of the first groove 45 and the second groove 46 is easily broken. The thickness dimension M1 of the thin plate portion 41 where the first groove portion 45 is formed and the thickness dimension M2 of the thin plate portion 41 where the second groove portion 46 is formed may be appropriately set according to the operating pressure to be set. Good.

なお、第一溝部４５と第二溝部４６の断面形状及び平面形状は互いに異なってもよい。また、第一溝部４５及び第二溝部４６のいずれか一方の溝深さを他方より大きくしてもよい。また、第一溝部４５及び第二溝部４６の断面形状はＶ字状に限定するものではなく、他の形状であってもよい。また、本実施形態では二条の溝部を設けたが、１条であってもよいし、３条以上であってもよい。   In addition, the cross-sectional shape and planar shape of the 1st groove part 45 and the 2nd groove part 46 may mutually differ. Moreover, you may make any one groove depth of the 1st groove part 45 and the 2nd groove part 46 larger than the other. Moreover, the cross-sectional shape of the 1st groove part 45 and the 2nd groove part 46 is not limited to V shape, Other shapes may be sufficient. In the present embodiment, the two groove portions are provided, but there may be one or three or more.

次に、電池ケース用蓋１の製造方法について説明する。
本実施形態に係る電池ケース用蓋１の製造方法は、図４に示すように、延し成形工程と、第一矯正工程と、第二矯正工程と、折返し工程と、予備折重ね工程と、本折重ね工程と、溝部成形工程と、を行う。 Next, a method for manufacturing the battery case lid 1 will be described.
As shown in FIG. 4, the manufacturing method of the battery case lid 1 according to the present embodiment includes an extension molding process, a first correction process, a second correction process, a folding process, a preliminary folding process, A main folding process and a groove forming process are performed.

本実施形態に係る電池ケース用蓋１の製造方法では、図５の（ａ）に示すように、一枚の金属板Ｋを加工して成形する。金属板Ｋは、本実施形態では、板状のアルミニウム合金を用いている。金属板Ｋの厚さｔは、二次電池の用途に応じて、例えば１．０〜３．０ｍｍで適宜設定すればよい。金属板Ｋの厚さｔと電池ケース用蓋１の基板部２の厚さは同等になる。   In the method for manufacturing the battery case lid 1 according to the present embodiment, as shown in FIG. 5A, a single metal plate K is processed and formed. In this embodiment, the metal plate K uses a plate-like aluminum alloy. What is necessary is just to set the thickness t of the metal plate K suitably in 1.0-3.0 mm according to the use of a secondary battery, for example. The thickness t of the metal plate K is equal to the thickness of the substrate portion 2 of the battery case lid 1.

＜延し成形工程＞
延し成形工程では、図５の（ａ）乃至（ｄ）に示すように、金属板Ｋを加工して、被成形金属板（ワーク）Ｋ１に基板部２と筒状壁部３１と薄板部４１とを成形する。延し成形工程では、下型となる延し成形用ダイ１０１と、上型となる延し成形用パンチ１０２とを用いる。 <Extension molding process>
In the stretch forming process, as shown in FIGS. 5A to 5D, the metal plate K is processed, and the substrate portion 2, the cylindrical wall portion 31, and the thin plate portion are formed on the metal plate (workpiece) K1. 41 is formed. In the stretch forming process, a stretch molding die 101 serving as a lower mold and a stretch molding punch 102 serving as an upper mold are used.

延し成形用ダイ１０１は、図５の（ａ）に示すように、平坦な上面１０３に平面視円形状に窪んだ凹部１０４を備えた金型である。凹部１０４は、底面１０４ａと底面１０４ａに立設する側面１０４ｂとを有する。側面１０４ｂは、円筒状になっている。底面１０４ａと側面１０４ｂとで構成される入隅部１０４ｃの周縁部は、断面視円弧状になっている。また、側面１０４ｂと上面１０３とで構成される出隅部１０４ｄの周縁部は、断面視円弧状になっている。凹部１０４の深さｅ（上面１０３から底面１０４ａの最深部までの距離）は、本実施形態では金属板Ｋの厚さｔよりも若干深くなっている。凹部１０４の底面１０４ａは、平坦でもよいが、本実施形態では下方に向けてわずかに凸状となる球面で構成されている。底面１０４ａの球面の曲率半径Ｒ１は例えば１０００ｍｍ〜１５００ｍｍの間で設定すればよい。   As shown in FIG. 5A, the extension molding die 101 is a mold including a concave portion 104 that is recessed in a circular shape in plan view on a flat upper surface 103. The recess 104 has a bottom surface 104a and a side surface 104b standing on the bottom surface 104a. The side surface 104b has a cylindrical shape. The peripheral edge portion of the corner 104c composed of the bottom surface 104a and the side surface 104b has an arc shape in cross section. In addition, the peripheral edge portion of the protruding corner portion 104d configured by the side surface 104b and the upper surface 103 has an arc shape in cross section. The depth e of the recess 104 (the distance from the upper surface 103 to the deepest portion of the bottom surface 104a) is slightly deeper than the thickness t of the metal plate K in this embodiment. The bottom surface 104a of the recess 104 may be flat, but in the present embodiment, the bottom surface 104a is formed of a spherical surface that is slightly convex downward. The curvature radius R1 of the spherical surface of the bottom surface 104a may be set, for example, between 1000 mm and 1500 mm.

延し成形用パンチ１０２は、延し成形用ダイ１０１に対して上下方向に移動する金型であって、本体部１０５と突出部１０６とを有する。延し成形用パンチ１０２は、延し成形用ダイ１０１の凹部１０４と同心軸上で昇降する。本体部１０５は、円柱状を呈し、下端には押圧面１０２ａが形成されている。押圧面１０２ａは、平坦でもよいが、本実施形態では下方にわずかに凸状となる球面で構成されている。押圧面１０２ａの球面の曲率半径Ｒ２は例えば１０００ｍｍ〜１５００ｍｍの間で設定すればよい。押圧面１０２ａの球面の曲率半径Ｒ２は、凹部１０４の底面１０４ａの球面の曲率半径Ｒ１と同等か、底面１０４ａの球面の曲率半径Ｒ１よりも小さく設定されることが好ましい。   The extension molding punch 102 is a mold that moves in the vertical direction with respect to the extension molding die 101, and has a main body portion 105 and a protruding portion 106. The stretch forming punch 102 moves up and down on a concentric axis with the concave portion 104 of the stretch forming die 101. The main body 105 has a cylindrical shape, and a pressing surface 102a is formed at the lower end. Although the pressing surface 102a may be flat, in this embodiment, it is comprised by the spherical surface which becomes slightly convex downward. The curvature radius R2 of the spherical surface of the pressing surface 102a may be set between 1000 mm and 1500 mm, for example. The radius of curvature R2 of the spherical surface of the pressing surface 102a is preferably set to be equal to or smaller than the radius of curvature R1 of the spherical surface of the bottom surface 104a of the recess 104.

突出部１０６は、本体部１０５の先端において、本体部１０５の側面１０５ａの全長に亘って側方にわずかに突出している。突出部１０６の断面形状は、外側に向けて凸状となる半円状になっている。本実施形態では、突出部１０６の断面の円弧と、入隅部１０４ｃの断面の円弧と、出隅部１０４ｄの断面の円弧は、同じ曲率半径で形成されている。   The protruding portion 106 slightly protrudes laterally at the tip of the main body portion 105 over the entire length of the side surface 105 a of the main body portion 105. The cross-sectional shape of the projecting portion 106 is a semicircular shape that is convex outward. In the present embodiment, the arc of the cross section of the protrusion 106, the arc of the cross section of the entrance corner 104c, and the arc of the cross section of the exit corner 104d are formed with the same radius of curvature.

図５の（ａ）に示すように、凹部１０４の側面１０４ｂと突出部１０６の外周（本実施形態では、頂点１０６ａを含む外周）との間には、隙間ｃが形成されている。隙間ｃは、本実施形態では、金属板Ｋの板厚ｔよりも小さく設定されている。   As shown in FIG. 5A, a gap c is formed between the side surface 104b of the recess 104 and the outer periphery of the protrusion 106 (in this embodiment, the outer periphery including the vertex 106a). In this embodiment, the gap c is set to be smaller than the plate thickness t of the metal plate K.

延し成形工程では、図５の（ａ）乃至（ｄ）に示すように、延し成形用ダイ１０１に金属板Ｋを配置して、金属板Ｋの一方面Ｋａ側から延し成形用パンチ１０２を下方に移動させる。図５の（ｂ）に示すように、金属板Ｋが変形して底面１０４ａに被成形金属板Ｋ１が当接したら、図５の（ｃ）及び（ｄ）に示すように、延し成形用パンチ１０２をさらに下方に移動させる。本実施形態では、薄板部４１を例えば０．３ｍｍに成形するため、底面１０４ａと延し成形用パンチ１０２の押圧面１０２ａとの距離が０．３ｍｍになるまで延し成形用パンチ１０２を下降させる。   In the stretch forming process, as shown in FIGS. 5A to 5D, a metal plate K is disposed on the stretch forming die 101, and the forming punch is extended from the one surface Ka side of the metal plate K. 102 is moved downward. As shown in FIG. 5B, when the metal plate K is deformed and the metal plate K1 is in contact with the bottom surface 104a, as shown in FIG. 5C and FIG. The punch 102 is moved further downward. In the present embodiment, in order to form the thin plate portion 41 to 0.3 mm, for example, the forming punch 102 is lowered until the distance between the bottom surface 104a and the pressing surface 102a of the extending punch 102 becomes 0.3 mm. .

延し成形用パンチ１０２を下降させると、底面１０４ａと押圧面１０２ａとの間の被成形金属板Ｋ１が圧延されて徐々に薄くなるとともに、金属が延し成形用パンチ１０２の中心から放射状に徐々に押し退けられる。押し退けられた金属は、凹部１０４の側面１０４ｂに当って鉛直方向に移動方向を変えられて鉛直方向上方に流出する。これにより、被成形金属板Ｋ１には、基板部２と基板部２に凹設された筒状壁部３１と筒状壁部３１の底面に成形された薄板部４１が成形される。基板部２は、筒状壁部３１が成形される際に、延し成形用ダイ１０１から浮き上がるように成形される。   When the extended forming punch 102 is lowered, the metal plate K1 between the bottom surface 104a and the pressing surface 102a is rolled and gradually thinned, and the metal extends and gradually increases radially from the center of the forming punch 102. Is pushed away. The pushed metal hits the side surface 104b of the recess 104, changes its movement direction in the vertical direction, and flows out upward in the vertical direction. As a result, the metal plate K <b> 1 is formed with the substrate portion 2, the cylindrical wall portion 31 recessed in the substrate portion 2, and the thin plate portion 41 formed on the bottom surface of the cylindrical wall portion 31. The substrate portion 2 is formed so as to float from the extended forming die 101 when the cylindrical wall portion 31 is formed.

筒状壁部３１の高さｈは、本実施形態では例えば１０ｍｍ程度になっている。高さｈは、延し成形用ダイ１０１の凹部１０４の深さｅよりも大きくなっている。また、延し成形用パンチ１０２の押込み距離ｆ（押圧面１０２ａが金属板Ｋに当接してから最下点までの距離）は、延し成形用ダイ１０１の凹部１０４の深さｅよりも大きくなっている。   In this embodiment, the height h of the cylindrical wall part 31 is about 10 mm. The height h is larger than the depth e of the concave portion 104 of the extension molding die 101. Further, the pressing distance f of the extended forming punch 102 (the distance from the contact of the pressing surface 102a to the metal plate K to the lowest point) is larger than the depth e of the recess 104 of the extending forming die 101. It has become.

仮に、凹部１０４の側面１０４ｂと延し成形用パンチ１０２（突出部１０６）との隙間ｃが、金属板Ｋの厚さｔと同等か、それよりも大きいと、被成形金属板Ｋ１が延し成形用ダイ１０１に引き込まれた後に、被成形金属板Ｋ１を圧延して薄板部４１を薄く成形する加工が行われる。そのため、被成形金属板Ｋ１のうち延し成形用ダイ１０１と延し成形用パンチ１０２（突出部１０６）とで挟まれていない部分、つまり、筒状壁部３１を構成する部分に歪み（シワ）が発生してしまう。歪みが発生してしまうと、次工程移行で加工安定性に悪影響が出てしまう。   If the gap c between the side surface 104b of the concave portion 104 and the extended forming punch 102 (projecting portion 106) is equal to or larger than the thickness t of the metal plate K, the metal plate K1 to be formed is extended. After being drawn into the forming die 101, a process for rolling the metal plate K1 to form the thin plate portion 41 thinly is performed. Therefore, a portion of the metal plate K1 that is not sandwiched between the extended forming die 101 and the extended forming punch 102 (projecting portion 106), that is, a portion that forms the cylindrical wall portion 31 is distorted (wrinkled). ) Will occur. If distortion occurs, processing stability will be adversely affected in the next process transition.

しかし、本実施形態によれば、凹部１０４の側面１０４ｂと延し成形用パンチ１０２（突出部１０６）との隙間ｃが、金属板Ｋの厚さｔよりも小さいため、延し成形工程における被成形金属板Ｋ１の最初の動きだしは、延し成形用ダイ１０１と延し成形用パンチ１０２とで挟まれた部分、つまり、薄板部４１を構成する部分になる。これにより、被成形金属板Ｋ１のうち延し成形用ダイ１０１と延し成形用パンチ１０２（突出部１０６）とで挟まれていない部分の歪みを少なくすることができる。これにより、次工程移行での加工安定性を向上させることができ、製品の質を高めることができる。なお、隙間ｃと板厚ｔとの関係が、０．８ｔ≒ｃの場合、筒状壁部３１の高さｈが１０ｍｍ程度になる。   However, according to the present embodiment, the gap c between the side surface 104b of the recess 104 and the extended forming punch 102 (projecting portion 106) is smaller than the thickness t of the metal plate K, so The first movement of the formed metal plate K1 is a portion sandwiched between the extended forming die 101 and the extended forming punch 102, that is, a portion constituting the thin plate portion 41. Thereby, the distortion of the part which is not pinched | interposed by the extending | molding die | dye 101 and the extending | stretching punch 102 (projection part 106) among the to-be-formed metal plates K1 can be reduced. Thereby, the process stability in the next process shift can be improved, and the quality of the product can be improved. When the relationship between the gap c and the plate thickness t is 0.8 t≈c, the height h of the cylindrical wall portion 31 is about 10 mm.

図６は、延し成形工程で成形された被成形金属板である。図６に示すように、被成形金属板Ｋ１の基板部２は、スプリングバックによって水平面に対して斜め上方に向けて傾斜している。筒状壁部３１には比較的肉厚の基端部３２と、基端部３２の端部から薄板部４１に向けて徐々に薄くなるテーパー部３３とが形成されている。テーパー部３３と薄板部４１との入隅部３３ａの周縁部は断面視円弧状になっている。テーパー部３３は、延し成形工程で薄板部４１を成形する際に、薄板部４１が薄くなるにつれて凹部１０４から流出される金属も徐々に少なくなるため徐々に薄くなっている。   FIG. 6 shows a metal sheet to be formed that is formed in the stretch forming process. As shown in FIG. 6, the board | substrate part 2 of the to-be-shaped metal plate K1 inclines diagonally upward with respect to a horizontal surface with a spring back. The tubular wall portion 31 is formed with a relatively thick base end portion 32 and a tapered portion 33 that gradually decreases from the end portion of the base end portion 32 toward the thin plate portion 41. The peripheral edge portion of the corner portion 33a between the taper portion 33 and the thin plate portion 41 is arcuate in sectional view. When the thin plate portion 41 is formed in the stretch forming process, the taper portion 33 is gradually thinned because the metal flowing out of the recess 104 gradually decreases as the thin plate portion 41 becomes thin.

薄板部４１の中央部分は、延し成形用パンチ１０２の押し込み方向（図６では下方）に向けてわずかに凸状になっている。   The central portion of the thin plate portion 41 is slightly convex toward the pushing direction of the extended forming punch 102 (downward in FIG. 6).

＜第一矯正工程＞
第一矯正工程では、図７の（ａ）及び（ｂ）に示すように、被成形金属板Ｋ１の薄板部４１を平坦に矯正する。第一矯正工程では、下型となる第一矯正用ダイ１１１と、上型となる第一矯正用パンチ１１２とを用いる。 <First correction process>
In the first straightening step, as shown in FIGS. 7A and 7B, the thin plate portion 41 of the metal plate K1 is straightened. In the first straightening step, a first straightening die 111 serving as a lower mold and a first straightening punch 112 serving as an upper mold are used.

第一矯正用ダイ１１１は、上面１１３に薄板部４１の外径よりもやや大きく形成された平面視円形状の凹み部１１４を備えた金型である。凹み部１１４は、筒状壁部３１の高さよりも浅くなっている。凹み部１１４の底面は平坦になっている。   The first correcting die 111 is a mold including a concave portion 114 having a circular shape in plan view and formed on the upper surface 113 slightly larger than the outer diameter of the thin plate portion 41. The recessed portion 114 is shallower than the height of the cylindrical wall portion 31. The bottom surface of the recess 114 is flat.

第一矯正用パンチ１１２は、円柱状を呈する金型である。第一矯正用パンチ１１２の外径は、筒状壁部３１の内径よりも若干小さくなっている。第一矯正用パンチ１１２は、第一矯正用ダイ１１１の凹み部１１４と同心軸上で昇降する。第一矯正用パンチ１１２の押圧面１１２ａは、平坦になっている。   The first correction punch 112 is a mold having a cylindrical shape. The outer diameter of the first correcting punch 112 is slightly smaller than the inner diameter of the cylindrical wall portion 31. The first correction punch 112 moves up and down on a concentric axis with the recess 114 of the first correction die 111. The pressing surface 112a of the first correcting punch 112 is flat.

第一矯正工程では、被成形金属板Ｋ１の一方面Ｋａが上方を向くようにするとともに、薄板部４１を凹み部１１４に配置する。そして、第一矯正用パンチ１１２で薄板部４１を押圧し、図７の（ｂ）に示すように、薄板部４１を平坦に矯正する。   In the first straightening step, the one surface Ka of the metal plate K <b> 1 is directed upward, and the thin plate portion 41 is disposed in the recessed portion 114. Then, the thin plate portion 41 is pressed with the first correcting punch 112, and the thin plate portion 41 is flattened as shown in FIG.

＜第二矯正工程＞
第二矯正工程では、図８の（ａ）及び（ｂ）に示すように、被成形金属板Ｋ１の基板部２に対して筒状壁部３１が垂直になるように矯正する。第二矯正工程では、図８の（ａ）に示すように、第二矯正用ダイ１２１と、第二矯正用パンチ１２２とを用いる。 <Second straightening process>
In the second correction step, as shown in FIGS. 8A and 8B, correction is performed so that the cylindrical wall portion 31 is perpendicular to the substrate portion 2 of the metal plate K1. In the second straightening step, as shown in FIG. 8A, a second straightening die 121 and a second straightening punch 122 are used.

第二矯正用ダイ１２１は、平坦な上面１２３に突設部１２４を備えた金型である。突設部１２４は、円柱状を呈し、筒状壁部３１の内径よりも若干小さい外径になっている。突設部１２４の上面は平坦になっている。突設部１２４の高さは、筒状壁部３１の高さと略同等になっている。   The second correction die 121 is a mold having a projecting portion 124 on a flat upper surface 123. The projecting portion 124 has a columnar shape, and has an outer diameter slightly smaller than the inner diameter of the cylindrical wall portion 31. The upper surface of the protruding portion 124 is flat. The height of the protruding portion 124 is substantially equal to the height of the cylindrical wall portion 31.

第二矯正用パンチ１２２は、円筒状を呈する金型である。第二矯正用パンチ１２２の内部は、中空になっており、その内径が筒状壁部３１の外径よりも大きくなっている。第二矯正用パンチ１２２は、第二矯正用ダイ１２１の突設部１２４と同心軸上で昇降する。   The second correction punch 122 is a mold having a cylindrical shape. The inside of the second correction punch 122 is hollow, and the inner diameter thereof is larger than the outer diameter of the cylindrical wall portion 31. The second correction punch 122 moves up and down on a concentric axis with the protruding portion 124 of the second correction die 121.

第二矯正工程では、被成形金属板Ｋ１の表裏を逆にして他方面Ｋｂが上方を向くようにするとともに、薄板部４１が突設部１２４の上方に位置するように第二矯正用ダイ１２１に被成形金属板Ｋ１を配置する。そして、第二矯正用パンチ１２２で被成形金属板Ｋ１を押圧する。第二矯正工程を行うことにより、図８の（ｂ）に示すように、被成形金属板Ｋ１の基板部２に対して筒状壁部３１が垂直になるように矯正される。   In the second straightening step, the second straightening die 121 is arranged so that the metal plate K1 is turned upside down so that the other surface Kb faces upward and the thin plate portion 41 is positioned above the protruding portion 124. The metal plate K1 to be formed is disposed on the surface. Then, the metal plate K <b> 1 is pressed with the second correction punch 122. By performing the second correction step, the cylindrical wall portion 31 is corrected so as to be perpendicular to the substrate portion 2 of the metal plate K1 as shown in FIG. 8B.

＜折返し工程＞
折返し工程では、図９の（ａ）及び（ｂ）に示すように、被成形金属板Ｋ１の薄板部４１を折り返す。折返し工程では、下型となる折返し用ダイ１３１と、折返し用パンチ１３２とを用いる。 <Returning process>
In the folding process, as shown in FIGS. 9A and 9B, the thin plate portion 41 of the metal plate K1 is folded. In the folding process, a folding die 131 and a folding punch 132 serving as a lower mold are used.

折返し用ダイ１３１は、平坦な上面１３３に突設部１３４が形成された金型である。突設部１３４は略円柱状を呈する。突設部１３４の外径は、筒状壁部３１の内径よりも小さくなっている。突設部１３４の上面１３４ａは平坦になっている。突設部１３４の高さは、筒状壁部３１の高さの四分の一程度になっている。   The folding die 131 is a mold in which a projecting portion 134 is formed on a flat upper surface 133. The projecting portion 134 has a substantially cylindrical shape. The outer diameter of the protruding portion 134 is smaller than the inner diameter of the cylindrical wall portion 31. The upper surface 134a of the projecting portion 134 is flat. The height of the protruding portion 134 is about a quarter of the height of the cylindrical wall portion 31.

折返し用パンチ１３２は、略円柱状を呈する金型である。折返し用パンチ１３２は、本体部１３５と、本体部１３５の下端に形成された幅狭部１３６とを有する。幅狭部１３６は、下方に向けて徐々に幅狭になるように形成されている。折返し用パンチ１３２は、折返し用ダイ１３１の突設部１３４と同心軸上で昇降する。本体部１３５の外径は、筒状壁部３１の内径よりも小さくなっている。幅狭部１３６の押圧面１３６ａは、薄板部４１の内径よりも小さくなっている。   The folding punch 132 is a mold having a substantially cylindrical shape. The folding punch 132 has a main body part 135 and a narrow part 136 formed at the lower end of the main body part 135. The narrow portion 136 is formed so as to gradually become narrower downward. The folding punch 132 moves up and down on a concentric axis with the protruding portion 134 of the folding die 131. The outer diameter of the main body part 135 is smaller than the inner diameter of the cylindrical wall part 31. The pressing surface 136 a of the narrow portion 136 is smaller than the inner diameter of the thin plate portion 41.

折返し工程では、被成形金属板Ｋ１の他方面Ｋｂが上方を向くようにするとともに、薄板部４１が突設部１３４の上方に位置するように折返し用ダイ１３１に被成形金属板Ｋ１を配置する。そして、図９の（ｂ）に示すように、突設部１３４に薄板部４１が当接するまで、折返し用パンチ１３２で薄板部４１を下方に押圧する。これにより、薄板部４１の高さ位置は、折返し工程前に比べて、三分の二程度になる。また、筒状壁部３１のテーパー部３３が内側に折り返されるとともに、基端部３２が外側に若干拡げられる。テーパー部３３が折り返されて湾曲した部分を湾曲部３４とする。湾曲部３４は、平面視してリング状に形成される。   In the folding step, the metal plate K1 is disposed on the folding die 131 so that the other surface Kb of the metal plate K1 faces upward and the thin plate portion 41 is positioned above the protruding portion 134. . Then, as shown in FIG. 9B, the thin plate portion 41 is pressed downward by the folding punch 132 until the thin plate portion 41 contacts the protruding portion 134. Thereby, the height position of the thin plate portion 41 is about two thirds compared with that before the folding step. Further, the tapered portion 33 of the cylindrical wall portion 31 is folded inward, and the proximal end portion 32 is slightly expanded outward. A portion where the tapered portion 33 is bent and curved is referred to as a curved portion 34. The curved portion 34 is formed in a ring shape in plan view.

＜予備折重ね工程＞
予備折重ね工程では、図１０の（ａ）及び（ｂ）に示すように、被成形金属板Ｋ１の湾曲部３４を外側に押し拡げつつ基板部２方向に途中まで折り重ねる。つまり、予備折重ね工程は、筒状壁部３１を確実に折り重ねるために予備的に行う。予備折重ね工程では、下型となる予備折重ね用ダイ１４１と、上型となる予備折重ね用パンチ１４２と、挟持手段Ｇとを用いる。 <Preliminary folding process>
In the preliminary folding step, as shown in FIGS. 10A and 10B, the curved portion 34 of the metal plate K1 is folded outwardly in the direction of the substrate portion 2 while being spread outward. In other words, the preliminary folding step is performed in order to reliably fold the cylindrical wall portion 31. In the preliminary folding step, a preliminary folding die 141 serving as a lower mold, a preliminary folding punch 142 serving as an upper mold, and a clamping means G are used.

予備折重ね用ダイ１４１は、平坦な上面１４３を備えた金型である。挟持手段Ｇは、円筒状を呈する。挟持手段Ｇと上面１４３とで被成形金属板Ｋ１を挟持することができる。   The pre-folding die 141 is a mold having a flat upper surface 143. The clamping means G has a cylindrical shape. The metal plate K <b> 1 can be clamped by the clamping means G and the upper surface 143.

予備折重ね用パンチ１４２は、円柱状を呈する金型であって、予備折重ね用ダイ１４１に対して昇降する。予備折重ね用パンチ１４２は、本体部１４４と、本体部１４４の下端に形成された下端部１４５とを有する。本体部１４４は、筒状壁部３１の基端部３２の外径よりも大きくなっている。下端部１４５は、下方に向けて幅狭となる円錐台形状を呈する。下端部１４５の上端部１４５ａの直径は、基端部３２の外径よりも若干大きくなっており、下端部１４５の押圧面１４５ｂの直径は、薄板部４１の直径と略同等になっている。   The pre-folding punch 142 is a mold having a cylindrical shape, and moves up and down with respect to the pre-folding die 141. The pre-folding punch 142 has a main body portion 144 and a lower end portion 145 formed at the lower end of the main body portion 144. The main body portion 144 is larger than the outer diameter of the proximal end portion 32 of the cylindrical wall portion 31. The lower end 145 has a truncated cone shape that becomes narrower downward. The diameter of the upper end portion 145 a of the lower end portion 145 is slightly larger than the outer diameter of the base end portion 32, and the diameter of the pressing surface 145 b of the lower end portion 145 is substantially equal to the diameter of the thin plate portion 41.

予備折重ね工程では、被成形金属板Ｋ１の他方面Ｋｂが上方を向くように被成形金属板Ｋ１を予備折重ね用ダイ１４１に配置して、上面１４３と挟持手段Ｇとで被成形金属板Ｋ１を移動不能に拘束する。そして、予備折重ね用パンチ１４２の下端部１４５のテーパー面１４５ｃで湾曲部３４を外側に押し広げつつ、押圧面１４５ｂで薄板部４１を下方に押し込む。これにより、図１０の（ｂ）に示すように、基端部３２とテーパー部３３とが面接触するとともに、基板部２から湾曲部３４の先端までの高さが、予備重ね工程を行う前に比べて半分程度の高さになる。また、薄板部４１の下面の高さ位置は、基板部２の上面の高さと略同等になる。   In the pre-folding step, the metal plate K1 is placed on the pre-folding die 141 so that the other surface Kb of the metal plate K1 faces upward, and the metal plate is formed by the upper surface 143 and the clamping means G. K1 is restrained so as not to move. The thin plate portion 41 is pushed downward by the pressing surface 145b while the curved portion 34 is spread outward by the tapered surface 145c of the lower end portion 145 of the pre-folding punch 142. Accordingly, as shown in FIG. 10B, the base end portion 32 and the taper portion 33 are in surface contact with each other, and the height from the substrate portion 2 to the distal end of the curved portion 34 is set to be before the preliminary stacking step. It is about half the height of Further, the height position of the lower surface of the thin plate portion 41 is substantially the same as the height of the upper surface of the substrate portion 2.

＜本折重ね工程＞
本折重ね工程では、図１１の（ａ）及び（ｂ）に示すように、被成形金属板Ｋ１の湾曲部３４をさらに外側に押し拡げつつ基板部２に完全に折り重ねる。本折重ね工程では、下型となる本折重ね用ダイ１５１と、上型となる本折重ね用パンチ１５２と、挟持手段Ｇとを用いる。 <Main folding process>
In this folding process, as shown in FIGS. 11A and 11B, the curved portion 34 of the metal plate K <b> 1 is further folded outwardly and completely folded on the substrate portion 2. In the main folding step, a main folding die 151 serving as a lower mold, a main folding punch 152 serving as an upper mold, and a clamping means G are used.

本折重ね用ダイ１５１は、平坦な上面１５３を備えた金型である。挟持手段Ｇは、円筒状を呈する。挟持手段Ｇと上面１５３とで被成形金属板Ｋ１を挟持することができる。   The folding die 151 is a mold having a flat upper surface 153. The clamping means G has a cylindrical shape. The metal plate K <b> 1 can be clamped by the clamping means G and the upper surface 153.

本折重ね用パンチ１５２は、略円柱状を呈する金型である。本折重ね用パンチ１５２は、本折重ね用ダイ１５１に対して昇降する。本折重ね用パンチ１５２は、本体部１５４と、本体部１５４の下面１５４ａに形成された凸状部１５５とを有する。本体部１５４の外径は、基端部３２の外径よりも大きくなっている。本体部１５４の下面１５４ａは平坦になっている。   The folding punch 152 is a metal mold having a substantially cylindrical shape. The main folding punch 152 moves up and down with respect to the main folding die 151. The folding punch 152 has a main body portion 154 and a convex portion 155 formed on the lower surface 154 a of the main body portion 154. The outer diameter of the main body portion 154 is larger than the outer diameter of the base end portion 32. The lower surface 154a of the main body 154 is flat.

凸状部１５５は、本体部１５４の下面１５４ａから下方に突出しており、略円柱状を呈する。凸状部１５５の押圧面１５５ａは、平坦になっている。凸状部１５５の下端の周縁部は、断面視円弧状になっている。凸状部１５５の高さは、基板部２の板厚と略同等になっている。   The convex portion 155 protrudes downward from the lower surface 154a of the main body portion 154 and has a substantially cylindrical shape. The pressing surface 155a of the convex portion 155 is flat. The peripheral edge at the lower end of the convex portion 155 is arcuate in cross section. The height of the convex portion 155 is substantially equal to the plate thickness of the substrate portion 2.

本折重ね工程では、被成形金属板Ｋ１の他方面Ｋｂが上方を向くように本折重ね用ダイ１５１に配置して、上面１５３と挟持手段Ｇとで被成形金属板Ｋ１を移動不能に拘束する。そして、本折重ね用パンチ１５２の下面１５４ａで湾曲部３４を外側に押し広げつつ、凸状部１５５の押圧面１５５ａで薄板部４１を下方に押し込む。これにより、基端部３２が基板部２に面接触する。また、薄板部４１の上面と、基板部２の上面とが略同一面上になる。本折重ね工程によって、薄板部４１の周囲に折重ね部３が形成される。   In the final folding step, the metal plate K1 is placed on the main folding die 151 so that the other surface Kb of the metal plate K1 faces upward, and the metal plate K1 is restrained from being movable by the upper surface 153 and the clamping means G. To do. Then, the thin plate portion 41 is pushed downward by the pressing surface 155 a of the convex portion 155 while the curved portion 34 is spread outward by the lower surface 154 a of the main folding punch 152. Thereby, the base end portion 32 comes into surface contact with the substrate portion 2. Further, the upper surface of the thin plate portion 41 and the upper surface of the substrate portion 2 are substantially on the same plane. The folding part 3 is formed around the thin plate part 41 by this folding process.

＜溝部成形工程＞
溝部成形工程では、図１２の（ａ）及び（ｂ）に示すように、薄板部４１に溝部等を成形する。溝部成形工程では、下型となる溝部成形用ダイ１６１と、上型となる溝部成形用パンチ１６２とを用いる。 <Groove forming process>
In the groove forming step, a groove or the like is formed in the thin plate portion 41 as shown in FIGS. In the groove forming step, a groove forming die 161 serving as a lower mold and a groove forming punch 162 serving as an upper mold are used.

溝部成形用ダイ１６１は、平坦な上面１６３に突設部１６４を備えた金型である。突設部１６４は、略円柱状を呈し、その上面には図２を参照するように、中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５、第二溝部４６を成形するための凸凹が形成されている。   The groove forming die 161 is a mold including a projecting portion 164 on a flat upper surface 163. The projecting portion 164 has a substantially cylindrical shape, and as shown in FIG. 2 on the upper surface thereof, the central convex portion 42, the first relief portion 43, the second relief portion 44, the first groove portion 45, and the second groove portion 46. Concavities and convexities are formed for molding the.

溝部成形用パンチ１６２は、溝部成形用ダイ１６１の突設部１６４と同心軸上で昇降する金型である。溝部成形用パンチ１６２の押圧面１６２ａには図２を参照するように、中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５、第二溝部４６を成形するための凸凹が形成されている。   The groove forming punch 162 is a mold that moves up and down on a concentric axis with the protruding portion 164 of the groove forming die 161. As shown in FIG. 2, the center convex portion 42, the first relief portion 43, the second relief portion 44, the first groove portion 45, and the second groove portion 46 are formed on the pressing surface 162 a of the groove-forming punch 162. Unevenness is formed.

溝部成形工程では、被成形金属板Ｋ１の他方面Ｋｂが上方を向くようにするとともに、薄板部４１を突設部１６４の上に配置する。そして、溝部成形用ダイ１６１に対して溝部成形用パンチ１６２を押圧して、薄板部４１に中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５、第二溝部４６を成形する。以上の工程によって、電池ケース用蓋１が形成される。   In the groove forming step, the other surface Kb of the metal plate K1 is directed upward, and the thin plate portion 41 is disposed on the protruding portion 164. Then, the groove forming punch 162 is pressed against the groove forming die 161, and the central protrusion 42, the first relief portion 43, the second relief portion 44, the first groove portion 45, and the second groove portion 46 are pressed against the thin plate portion 41. Is molded. Through the above steps, the battery case lid 1 is formed.

以上説明した電池ケース用蓋１の製造方法によれば、金属板Ｋを拘束しない状態で、延し成形用パンチ１０２で金属板Ｋを押し込むため、成形時の歪みの導入量が少なくなり被成形金属板Ｋ１の加工硬化を抑制することができる。これにより、薄板部４１に第一溝部４５及び第二溝部４６を成形する際に、薄板部４１が割れるのを防ぐことができる。また、金属板Ｋに延し成形用パンチ１０２を押し込むだけでよいため、薄板部４１を成形する際の成形作業が容易である。また、被成形金属板Ｋ１の加工硬化を抑制できるため、焼鈍工程を省略することが可能となる。これにより、作業工程を少なくすることができる。   According to the method for manufacturing the battery case lid 1 described above, since the metal plate K is pushed in by the stretch forming punch 102 without restraining the metal plate K, the amount of distortion introduced during molding is reduced and the molding is performed. Work hardening of the metal plate K1 can be suppressed. Thereby, when the 1st groove part 45 and the 2nd groove part 46 are shape | molded in the thin plate part 41, it can prevent that the thin plate part 41 cracks. Further, since it is only necessary to extend the metal plate K and push the forming punch 102, the forming operation when forming the thin plate portion 41 is easy. Moreover, since the work hardening of the metal plate K1 can be suppressed, the annealing step can be omitted. Thereby, the work process can be reduced.

また、延し成形工程では、薄板部４１を徐々に薄くしつつ、底面１０４ａと延し成形用パンチ１０２とで押し退けられた金属を、凹部１０４の側面１０４ｂと延し成形用パンチ１０２との隙間ｃに流動させることにより、隙間ｃから流出した金属を鉛直方向に導くことができる。これにより、薄板部４１に対して略垂直な筒状壁部３１を成形することができる。また、本実施形態では、凹部１０４の入隅部１０４ｃ及び延し成形用パンチ１０２の突出部１０６が円弧状になっているため、スムーズに金属を流出させることができる。   Further, in the stretch forming process, the thin plate portion 41 is gradually thinned, and the metal pushed away by the bottom surface 104 a and the stretch forming punch 102 is removed from the gap between the side surface 104 b of the recess 104 and the forming punch 102. By flowing to c, the metal flowing out from the gap c can be guided in the vertical direction. Thereby, the cylindrical wall part 31 substantially perpendicular to the thin plate part 41 can be formed. In the present embodiment, since the corner 104c of the recess 104 and the protrusion 106 of the extended forming punch 102 have an arc shape, the metal can flow out smoothly.

また、延し成形用ダイ１０１の凹部１０４の側面１０４ｂと延し成形用パンチ１０２との隙間ｃが、金属板Ｋの厚さｔよりも小さいため、延し成形工程における被成形金属板Ｋ１の最初の動きだしは、延し成形用ダイ１０１と延し成形用パンチ１０２とで挟まれた部分になる。これにより、被成形金属板Ｋ１のうち延し成形用ダイ１０１と延し成形用パンチ１０２とで挟まれていない部分、つまり、筒状壁部３１を構成する部分の歪みを少なくすることができるため、加工安定性を高めることができる。   In addition, since the gap c between the side surface 104b of the recess 104 of the extension forming die 101 and the extension punch 102 is smaller than the thickness t of the metal plate K, the metal plate K1 of the metal plate K1 in the extension forming process. The first movement starts at a portion sandwiched between the extended forming die 101 and the extended forming punch 102. Thereby, the distortion of the portion of the metal plate K1 that is not sandwiched between the extended forming die 101 and the extended forming punch 102, that is, the portion constituting the cylindrical wall portion 31 can be reduced. Therefore, processing stability can be improved.

また、延し成形用パンチ１０２の押圧面１０２ａが押圧方向に向けて凸状を呈する球面になっているので被成形金属板Ｋ１の中央から放射状に被成形金属板Ｋ１を圧延することができるため、薄板部４１の厚さを均一にすることができる。   In addition, since the pressing surface 102a of the extended forming punch 102 is a spherical surface having a convex shape in the pressing direction, the forming metal plate K1 can be rolled radially from the center of the forming metal plate K1. The thickness of the thin plate portion 41 can be made uniform.

また、延し成形用パンチ１０２には、側面１０５ａの先端に、側方に突出した突出部１０６が形成されているので、加工時に延し成形用パンチ１０２の側面１０５ａと被成形金属板Ｋ１との摩擦を回避することができる。これにより、延し成形用パンチ１０２との摩擦抵抗によって被成形金属板Ｋ１が変形するのを防止することができる。   In addition, since the extended forming punch 102 has a protruding portion 106 protruding laterally at the tip of the side surface 105a, the side surface 105a of the extended forming punch 102 and the metal plate K1 to be formed Can avoid friction. Thereby, it is possible to prevent the metal plate K1 from being deformed due to the frictional resistance with the stretch forming punch 102.

また、折返し工程を行うことで、筒状壁部３１の高さを低くすることができるため、電池ケース用蓋１の高さを低くすることができる。また、折重ね工程を行うことで、折重ね部３を形成できるとともに筒状壁部３１の高さをより低くすることができる。   Moreover, since the height of the cylindrical wall part 31 can be made low by performing a folding | turning process, the height of the battery case cover 1 can be made low. Moreover, by performing a folding process, while the folding part 3 can be formed, the height of the cylindrical wall part 31 can be made lower.

また、防爆弁４の周囲に、金属板Ｋを折重ねて成形された肉厚の折重ね部３が形成されるため、防爆弁４の周囲を補強することができる。また、溶接等による熱を折重ね部３で遮断することができるため、防爆弁４への入熱を低減することができる。また、折重ね部３を成形する際は、被成形金属板Ｋ１を折重ねるだけでよいため、製造作業が容易である。   Further, since the thick folded portion 3 formed by folding the metal plate K is formed around the explosion-proof valve 4, the periphery of the explosion-proof valve 4 can be reinforced. Moreover, since the heat | fever by welding etc. can be interrupted | blocked by the folding part 3, the heat input to the explosion-proof valve 4 can be reduced. Further, when forming the folded portion 3, it is only necessary to fold the metal plate K <b> 1, so that the manufacturing operation is easy.

また、電池ケース用蓋１の溝部（第一溝部４５及び第二溝部４６）は、電池ケースＰの内圧が作用する方向（本実施形態では上方）に向かうにつれて、その溝幅が拡開するようになっている。これにより、内圧が作用すると、溝部の溝幅が開く方向に変形しやすいため、確実に破断することができる。また、電池ケース用蓋１には、逃し部（第一逃し部４３及び第二逃し部４４）を備えているため、溝部を成形する際の余肉を効率よく逃して歪みの発生を防ぐことができる。   Moreover, the groove width (the first groove portion 45 and the second groove portion 46) of the battery case lid 1 is such that the groove width expands in the direction in which the internal pressure of the battery case P acts (upward in this embodiment). It has become. Thereby, when an internal pressure acts, since it is easy to deform | transform in the direction which the groove width of a groove part opens, it can fracture | rupture reliably. In addition, since the battery case lid 1 is provided with the escape portions (the first escape portion 43 and the second escape portion 44), the excess thickness at the time of forming the groove portion is efficiently released to prevent the occurrence of distortion. Can do.

以上本発明の実施形態について説明したが、本発明の趣旨に反しない範囲において、適宜設計変更が可能である。図１３は、防爆弁の溝部の変形例を示した拡大断面図である。図１３に示す薄板部４１Ａには、第一溝部４５Ａと第二溝部４６Ａとが形成されている。第一溝部４５Ａ及び第二溝部４６Ａは、幅広に形成された拡大部５１と拡大部５１の底面に形成された狭小部５２とで構成されている。このように、溝部の深さを二段階で構成してもよい。   Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. FIG. 13 is an enlarged cross-sectional view showing a modified example of the groove portion of the explosion-proof valve. In the thin plate portion 41A shown in FIG. 13, a first groove portion 45A and a second groove portion 46A are formed. 45 A of 1st groove parts and 46 A of 2nd groove parts are comprised by the enlarged part 51 formed in the width | variety, and the narrow part 52 formed in the bottom face of the enlarged part 51. As shown in FIG. Thus, you may comprise the depth of a groove part in two steps.

また、防爆弁４は、本実施形態では平面視円形状に形成されているが、形状を制限するものではない。防爆弁４は、例えば、平面視して楕円状又は長円状であってもよい。また、実施形態で記載した寸法はあくまで例示であって、本発明を限定するものではない。   Moreover, although the explosion-proof valve 4 is formed in a circular shape in plan view in the present embodiment, the shape is not limited. For example, the explosion-proof valve 4 may be elliptical or oval in plan view. Moreover, the dimension described in embodiment is an illustration to the last, Comprising: This invention is not limited.

また、本実施形態では、図２で示すように、電池ケース用蓋１の外側（内圧が作用する面とは反対の面）に折重ね部３を形成したが、内側に折重ね部３を設けてもよい。   Moreover, in this embodiment, as shown in FIG. 2, although the folding part 3 was formed in the outer side (surface opposite to the surface where an internal pressure acts) of the battery case lid 1, the folding part 3 was formed inside. It may be provided.

また、本実施形態では、図４で示すように、本折重ね工程の後に凹溝成形工程を行ったがこれに限定されるものではない。凹溝成形工程は、延し成形工程、第一矯正工程、第二矯正工程、折返し工程、予備折重ね工程のいずれかの後に行ってもよい。   Moreover, in this embodiment, as shown in FIG. 4, although the ditch | groove formation process was performed after this folding process, it is not limited to this. The concave groove forming step may be performed after any of the stretch forming step, the first straightening step, the second straightening step, the folding step, and the preliminary folding step.

図１４は、電池ケース用蓋の第一変形例を示した断面図である。図１４に示すように、第一変形例に係る電池ケース用蓋１Ａは、延し成形工程後の薄板部４１に、前記した溝部成形工程を行うことにより、中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５及び第二溝部４６を成形している。図１４の第一溝部４５及び第二溝部４６は、図３に示すものと同等である。   FIG. 14 is a cross-sectional view showing a first modification of the battery case lid. As shown in FIG. 14, the battery case lid 1 </ b> A according to the first modified example is obtained by performing the groove forming step on the thin plate portion 41 after the extending forming step, thereby forming the central convex portion 42 and the first relief portion. 43, the second relief portion 44, the first groove portion 45, and the second groove portion 46 are formed. The first groove 45 and the second groove 46 in FIG. 14 are the same as those shown in FIG.

図１５は、電池ケース用蓋の第二変形例を示した断面図である。図１５に示すように、第二変形例に係る電池ケース用蓋１Ｂは、第一矯正工程後の薄板部４１に、前記した溝部成形工程を行うことにより、中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５及び第二溝部４６を成形している。図１５の第一溝部４５及び第二溝部４６は、図３に示すものと同等である。   FIG. 15 is a cross-sectional view showing a second modification of the battery case lid. As shown in FIG. 15, the battery case lid 1 </ b> B according to the second modified example performs the above-described groove forming step on the thin plate portion 41 after the first correction step, thereby causing the central convex portion 42 and the first relief portion to be formed. 43, the second relief portion 44, the first groove portion 45, and the second groove portion 46 are formed. The first groove 45 and the second groove 46 in FIG. 15 are the same as those shown in FIG.

図１６は、電池ケース用蓋の第三変形例を示した断面図である。図１６に示すように、第三変形例に係る電池ケース用蓋１Ｃは、第二矯正工程後の薄板部４１に、前記した溝部成形工程を行うことにより、中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５及び第二溝部４６を成形している。図１６の第一溝部４５及び第二溝部４６は、図３に示すものと同等である。   FIG. 16 is a cross-sectional view showing a third modification of the battery case lid. As shown in FIG. 16, the battery case lid 1 </ b> C according to the third modified example performs the above-described groove forming step on the thin plate portion 41 after the second straightening step, whereby the central convex portion 42 and the first relief portion are formed. 43, the second relief portion 44, the first groove portion 45, and the second groove portion 46 are formed. The first groove 45 and the second groove 46 in FIG. 16 are the same as those shown in FIG.

図１７は、電池ケース用蓋の第四変形例を示した断面図である。図１７に示すように、第四変形例に係る電池ケース用蓋１Ｄは、折返し工程後の薄板部４１に、前記した溝部成形工程を行うことにより、中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５及び第二溝部４６を成形している。図１７の第一溝部４５及び第二溝部４６は、図３に示すものと同等である。   FIG. 17 is a cross-sectional view showing a fourth modification of the battery case lid. As shown in FIG. 17, the battery case lid 1D according to the fourth modified example performs the above-described groove forming step on the thin plate portion 41 after the folding step, whereby the center convex portion 42, the first relief portion 43, The second relief portion 44, the first groove portion 45, and the second groove portion 46 are formed. The first groove 45 and the second groove 46 in FIG. 17 are the same as those shown in FIG.

図１８は、電池ケース用蓋の第五変形例を示した断面図である。図１８に示すように、第五変形例に係る電池ケース用蓋１Ｅは、予備折重ね工程後の薄板部４１に、前記した溝部成形工程を行うことにより、中央凸部４２、第一逃し部４３、第二逃し部４４、第一溝部４５及び第二溝部４６を成形している。図１８の第一溝部４５及び第二溝部４６は、図３に示すものと同等である。   FIG. 18 is a cross-sectional view showing a fifth modification of the battery case lid. As shown in FIG. 18, the battery case lid 1 </ b> E according to the fifth modified example performs the above-described groove forming process on the thin plate part 41 after the preliminary folding process, thereby causing the central convex part 42 and the first relief part to be formed. 43, the second relief portion 44, the first groove portion 45, and the second groove portion 46 are formed. The first groove 45 and the second groove 46 in FIG. 18 are the same as those shown in FIG.

前記した実施形態では折重ね部３を設けていたが、これに限定されるものではなく、第一変形例１Ａ〜第４変形例１Ｄのように折重ね部３を備えていない形態を電池ケース用蓋として使用してもよい。第一変形例１Ａ〜第四変形例１Ｄによれば、薄板部４１よりも肉厚の筒状壁部３１が形成されているため、薄板部４１を保護することができる。また、第五変形例１Ｅによれば、薄板部４１よりも肉厚の筒状壁部３１が形成されるとともに、予備折重ね工程によって基端部３２、テーパー部３３及び湾曲部３４が折り重なりさらに肉厚になるため、薄板部４１を保護することができる。   In the above-described embodiment, the folded portion 3 is provided. However, the embodiment is not limited to this, and a battery case having no folded portion 3 as in the first modified example 1A to the fourth modified example 1D is provided. It may be used as a lid for use. According to 1st modification 1A-4th modification 1D, since the cylindrical wall part 31 thicker than the thin plate part 41 is formed, the thin plate part 41 can be protected. Further, according to the fifth modified example 1E, the cylindrical wall portion 31 is formed thicker than the thin plate portion 41, and the base end portion 32, the tapered portion 33, and the curved portion 34 are folded and overlapped by the preliminary folding process. Furthermore, since it becomes thick, the thin plate part 41 can be protected.

１ 電池ケース用蓋
２ 基板部
３ 折重ね部
４ 防爆弁
３１ 筒状壁部
３２ 基端部
３３ テーパー部
３４ 湾曲部
４１ 薄板部
４２ 中央凸部
４３ 第一逃し部
４４ 第二逃し部
４５ 第一溝部（溝部）
４６ 第二溝部（溝部）
１０１ 延し成形用ダイ
１０２ 延し成形用パンチ
１０４ 凹部
１０４ａ底面
１０４ｂ側面
１３１ 折返し用ダイ
１３２ 折返し用パンチ
１４１ 予備折重ね用ダイ
１４２ 予備折重ね用パンチ
１５１ 本折重ね用ダイ
１５２ 本折重ね用パンチ
１６１ 溝部成形用ダイ
１６２ 溝部成形用パンチ
Ｋ 金属板
Ｋ１ 被成形金属板
Ｋａ 一方面
Ｋｂ 他方面
ｃ 隙間
ｅ 凹部の深さ
ｔ 金属板の厚さ DESCRIPTION OF SYMBOLS 1 Battery case cover 2 Board | substrate part 3 Folding part 4 Explosion-proof valve 31 Cylindrical wall part 32 Base end part 33 Tapered part 34 Curved part 41 Thin plate part 42 Central convex part 43 First relief part 44 Second relief part 45 1st Groove (groove)
46 Second groove (groove)
DESCRIPTION OF SYMBOLS 101 Die for extending forming 102 Punch for extending forming 104 Recessed part 104a Bottom surface 104b Side surface 131 Die for folding 132 Punch for folding 141 Die for preliminary folding 142 Punch for preliminary folding 151 Die for final folding 152 Punch for regular folding 161 Groove forming die 162 Groove forming punch K Metal plate K1 Molded metal plate Ka One side Kb The other side c Clearance e Depth of recess t Thickness of metal plate

Claims (4)

防爆弁を備えた電池ケース用蓋を製造する方法であって、
凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部及び当該薄板部から立ち上がる筒状壁部を成形する延し成形工程と、
前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された前記筒状壁部を折り返す折返し工程と、
前記薄板部に溝部を成形する溝部成形工程と、を含み、
前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、
前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部及び前記筒状壁部を成形するとともに、前記金属板と前記延し成形用パンチの外周側面の先端との間に隙間が生じるまで前記延し成形用パンチを押し込むことを特徴とする電池ケース用蓋の製造方法。 A method of manufacturing a battery case lid with an explosion-proof valve,
Extending from one side of a metal plate disposed on an extending forming die provided with a recess, a forming punch is pushed in to form a thin plate portion constituting the explosion-proof valve and a cylindrical wall portion rising from the thin plate portion. And molding process,
The tube formed around the thin plate portion by pressing the thin plate portion from the other side of the metal plate with a folding punch having an outer diameter smaller than the outer diameter of the thin plate portion after the extending forming step. A folding process for folding the wall-shaped part,
Including a groove portion forming step for forming a groove portion in the thin plate portion,
The inner diameter of the recess is larger than the outer diameter of the extended punch,
In the extension molding step, the extension punch is pushed in without restraining the metal plate, and the metal plate is rolled by the bottom surface of the recess and the pressing surface of the extension punch, thereby forming the thin plate portion and the tubular wall portion, characterized by pushing the cast molding punch until a gap is formed between the tip of the outer peripheral side surface of the cast molding punch and the metal plate method of manufacturing a lid for batteries case. 防爆弁を備えた電池ケース用蓋を製造する方法であって、
凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部及び当該薄板部から立ち上がる筒状壁部を成形する延し成形工程と、
前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された前記筒状壁部を折り返す折返し工程と、
前記折返し工程の後に、前記折返し工程で前記筒状壁部が折り返されることで成形された湾曲部を、折重ね用パンチで前記金属板の他方側から押圧し、前記湾曲部を折り重ねる折重ね工程と、
前記薄板部に溝部を成形する溝部成形工程と、を含み、
前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、
前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部及び前記筒状壁部を成形するとともに、前記金属板と前記延し成形用パンチの外周側面の先端との間に隙間が生じるまで前記延し成形用パンチを押し込むことを特徴とする電池ケース用蓋の製造方法。 A method of manufacturing a battery case lid with an explosion-proof valve,
Extending from one side of a metal plate disposed on an extending forming die provided with a recess, a forming punch is pushed in to form a thin plate portion constituting the explosion-proof valve and a cylindrical wall portion rising from the thin plate portion. And molding process,
The tube formed around the thin plate portion by pressing the thin plate portion from the other side of the metal plate with a folding punch having an outer diameter smaller than the outer diameter of the thin plate portion after the extending forming step. A folding process for folding the wall-shaped part,
After the folding step, the bending portion formed by folding the cylindrical wall portion in the folding step is pressed from the other side of the metal plate with a folding punch, and the folding portion is folded. Process,
Including a groove portion forming step for forming a groove portion in the thin plate portion,
The inner diameter of the recess is larger than the outer diameter of the extended punch,
In the extension molding step, the extension punch is pushed in without restraining the metal plate, and the metal plate is rolled by the bottom surface of the recess and the pressing surface of the extension punch, thereby forming the thin plate portion and the tubular wall portion, characterized by pushing the cast molding punch until a gap is formed between the tip of the outer peripheral side surface of the cast molding punch and the metal plate method of manufacturing a lid for batteries case. 防爆弁を備えた電池ケース用蓋を製造する方法であって、
凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部を成形する延し成形工程と、
前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された筒状壁部を折り返す折返し工程と、
前記薄板部に溝部を成形する溝部成形工程と、を含み、
前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、
前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部を成形することを特徴とする電池ケース用蓋の製造方法。 A method of manufacturing a battery case lid with an explosion-proof valve,
An extending forming step of forming a thin plate portion constituting the explosion-proof valve by pushing a forming punch extending from one side of a metal plate disposed in an extending forming die provided with a recess;
A cylindrical shape formed around the thin plate portion by pressing the thin plate portion from the other side of the metal plate with a folding punch having an outer diameter smaller than the outer diameter of the thin plate portion after the extending forming step. A folding process for folding the wall,
Including a groove portion forming step for forming a groove portion in the thin plate portion,
The inner diameter of the recess is larger than the outer diameter of the extended punch,
In the extension molding step, the extension punch is pushed in without restraining the metal plate, and the metal plate is rolled by the bottom surface of the recess and the pressing surface of the extension punch, A method for manufacturing a battery case lid, comprising forming a thin plate portion. 防爆弁を備えた電池ケース用蓋を製造する方法であって、
凹部を備えた延し成形用ダイに配置された金属板の一方側から延し成形用パンチを押し込んで、前記防爆弁を構成する薄板部を成形する延し成形工程と、
前記延し成形工程の後に、前記薄板部の外径よりも小さい外径の折返し用パンチで、前記金属板の他方側から前記薄板部を押圧し、前記薄板部の周囲に形成された筒状壁部を折り返す折返し工程と、
前記折返し工程の後に、前記折返し工程で前記筒状壁部が折り返されることで成形された湾曲部を、折重ね用パンチで前記金属板の他方側から押圧し、前記湾曲部を折り重ねる折重ね工程と、
前記薄板部に溝部を成形する溝部成形工程と、を含み、
前記凹部の内径は、前記延し成形用パンチの外径よりも大きくなっており、
前記延し成形工程では、前記金属板を拘束しない状態で前記延し成形用パンチを押し込み、前記凹部の底面と前記延し成形用パンチの押圧面とで前記金属板を圧延することで、前記薄板部を成形することを特徴とする電池ケース用蓋の製造方法。 A method of manufacturing a battery case lid with an explosion-proof valve,
An extending forming step of forming a thin plate portion constituting the explosion-proof valve by pushing a forming punch extending from one side of a metal plate disposed in an extending forming die provided with a recess;
A cylindrical shape formed around the thin plate portion by pressing the thin plate portion from the other side of the metal plate with a folding punch having an outer diameter smaller than the outer diameter of the thin plate portion after the extending forming step. A folding process for folding the wall,
After the folding step, the bending portion formed by folding the cylindrical wall portion in the folding step is pressed from the other side of the metal plate with a folding punch, and the folding portion is folded. Process,
Including a groove portion forming step for forming a groove portion in the thin plate portion,
The inner diameter of the recess is larger than the outer diameter of the extended punch,
In the extension molding step, the extension punch is pushed in without restraining the metal plate, and the metal plate is rolled by the bottom surface of the recess and the pressing surface of the extension punch, method for manufacturing a lid that batteries case be characterized by molding the thin plate portion.
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