JP2002063888A - Sealing component with safety valve, and its manufacturing method - Google Patents
Sealing component with safety valve, and its manufacturing methodInfo
- Publication number
- JP2002063888A JP2002063888A JP2000255750A JP2000255750A JP2002063888A JP 2002063888 A JP2002063888 A JP 2002063888A JP 2000255750 A JP2000255750 A JP 2000255750A JP 2000255750 A JP2000255750 A JP 2000255750A JP 2002063888 A JP2002063888 A JP 2002063888A
- Authority
- JP
- Japan
- Prior art keywords
- thin portion
- safety valve
- lid
- thin
- case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 title abstract description 25
- 238000005520 cutting process Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 7
- 230000000881 depressing effect Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000010409 thin film Substances 0.000 abstract description 6
- 238000005482 strain hardening Methods 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 230000000994 depressogenic effect Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は安全弁付密閉部品に
係わり、とりわけ内部が気密に遮蔽されるケース内部の
圧力が上昇したときに安全性を確保するために用いられ
る安全弁付密閉部品に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing part with a safety valve, and more particularly to a sealing part with a safety valve used to secure safety when the pressure inside a case whose inside is hermetically sealed increases.
【０００２】[0002]
【従来の技術】従来、例えば電池ケースの内部に有機溶
媒系電解液を注入して密閉したリチウムイオン二次電池
等が、電話やカメラ等の携帯用機器に充電可能な電源と
して広く使用されている。2. Description of the Related Art Conventionally, for example, a lithium ion secondary battery sealed by injecting an organic solvent-based electrolyte into a battery case has been widely used as a power source capable of charging portable equipment such as telephones and cameras. I have.
【０００３】ところが、このような電池に再充電すると
きに、過充電を行ったり、規定された電流よりも大きな
電流で充電を行ったりすると、電池に異常が生じて電池
内に気体が発生し、電池内の圧力が上昇して、電池の膨
張、さらには電池ケースに亀裂等が発生し、内部の電解
液が外部ににじみ出して、電池が組み込まれた機器に悪
影響を与えることがあった。また、これに至らなくてと
も、前述したような異常状態のままで、電池の使用を継
続すると、電池の膨張が進行し、電池ケースが破裂した
りする危険性があり、異常が生じた電池は速やかに使用
を中止する必要があった。However, when recharging such a battery, if the battery is overcharged or charged with a current larger than a specified current, an abnormality occurs in the battery and gas is generated in the battery. In some cases, the pressure inside the battery rises, the battery swells, and furthermore, the battery case cracks, etc., and the internal electrolyte oozes out to adversely affect equipment in which the battery is incorporated. . Also, even if this does not occur, if the use of the battery is continued in the abnormal state as described above, the battery may expand and the battery case may be ruptured. Had to be discontinued immediately.
【０００４】その対策として、前述したような電池にお
いては、図８に示すように、例えば電池ケース１１の内
部を気密に遮蔽して蓋閉する蓋体１２の一部に、薄肉部
１３から成る安全弁部１４を有する安全弁付密閉部品を
有するものがあった。このような安全弁付密閉部品を有
する電池は、安全弁部１４が蓋体１２の一部に形成した
薄肉部１３によって構成され、この薄肉部１３が他の部
分より強度的に弱くなって、破断容易になっていた。As a countermeasure, in the above-mentioned battery, as shown in FIG. 8, for example, a thin portion 13 is formed on a part of a lid 12 which closes the lid by hermetically shielding the inside of a battery case 11. There was one having a sealing part with a safety valve having a safety valve portion 14. In a battery having such a sealed part with a safety valve, the safety valve portion 14 is constituted by a thin portion 13 formed on a part of the lid 12, and the thin portion 13 is weaker in strength than other portions, so that it is easily broken. Had become.
【０００５】このような安全弁付密閉部品を備えた従来
のリチウムイオン二次電池は、電池ケース１１の内部圧
力が所定値以上に上昇すると、この上昇した内部圧力が
電池ケース１１、及び蓋体１２の内面に加わる。する
と、強度的に弱い薄肉部１３が外側に膨らんで、薄肉部
１３の一部が破断する。[0005] In a conventional lithium ion secondary battery provided with such a sealing part with a safety valve, when the internal pressure of the battery case 11 rises to a predetermined value or more, the increased internal pressure is reduced to the battery case 11 and the lid 12. Joins the inner surface of Then, the thin portion 13 having weak strength swells outward, and a part of the thin portion 13 is broken.
【０００６】そして、薄肉部１３の破断部分から電池ケ
ース１１の高圧になった内部圧力が外部に排出されて、
電池の破裂を未然に防止するようになっている。このよ
うな従来の安全弁付密閉部品は、蓋体１２が厚さ１ｍｍ
程度のステンレス等の硬質の金属板で形成され、この硬
質の金属板からなる蓋体１２の一部を縦フライス等によ
り切削バイト（図示せず）で切削して、薄肉部１３の厚
さを略２０μｍの薄膜状に形成していた。Then, the internal pressure of the battery case 11 at a high pressure is discharged from the broken portion of the thin portion 13 to the outside,
The battery is prevented from bursting. In such a conventional sealing part with a safety valve, the lid 12 has a thickness of 1 mm.
A part of the lid 12 made of a hard metal plate such as stainless steel is cut with a cutting tool (not shown) using a vertical milling cutter or the like to reduce the thickness of the thin portion 13. It was formed into a thin film of about 20 μm.
【０００７】[0007]
【発明が解決しようとする課題】しかし、従来の安全弁
付密閉部品は、厚さが略１ｍｍの蓋体１２の一部を、厚
さが略２０μｍになるまで切削バイトにいる切削加工だ
けで薄肉部１３形成していたので、薄肉部１３を形成す
るのに時間が掛かる問題があった。However, a conventional sealing part with a safety valve is a thin part of a lid 12 having a thickness of approximately 1 mm, which is obtained by cutting only a portion of a lid 12 having a thickness of approximately 20 μm in a cutting bite. Since the portion 13 is formed, there is a problem that it takes time to form the thin portion 13.
【０００８】また、薄肉部１３を形成するための加工時
間を短縮するために、切削バイトの回転数を上げると、
薄肉部１３が加工硬化して、切削途中で薄肉部１３にク
ラック等が発生する問題があった。また、薄肉部１３
は、蓋体１２の一部を、厚さ１ｍｍから略２０μｍに切
削バイトで切削するために、切削バイトの寿命が短くな
り、切削バイトを頻繁に交換しなければならないという
問題があった。Further, in order to shorten the processing time for forming the thin portion 13, when the rotation speed of the cutting tool is increased,
There is a problem that the thin portion 13 is work-hardened and cracks or the like occur in the thin portion 13 during cutting. In addition, the thin portion 13
However, since a part of the lid 12 is cut with a cutting bit from a thickness of 1 mm to about 20 μm, there is a problem that the life of the cutting bit is shortened and the cutting bit must be frequently replaced.
【０００９】本発明は前述したような問題点に鑑みてな
されたもので、ケースの内圧が所定値以上に上昇した場
合に、確実に安全弁部が破断して、圧力上昇した内部圧
力を外部に放出可能な、製造が容易で、且つ高性能な安
全弁付密閉部品とその製造方法を提供することを目的と
する。The present invention has been made in view of the above-mentioned problems, and when the internal pressure of the case rises to a predetermined value or more, the safety valve portion is reliably broken, and the increased internal pressure is transmitted to the outside. It is an object of the present invention to provide a releasable, easy-to-manufacture, high-performance sealing part with a safety valve and a method for manufacturing the same.
【００１０】[0010]
【課題を解決するための手段】前記課題を解決するため
の第１の解決手段として本発明の安全弁付密閉部品は、
ケースと、このケースの内部を気密に遮蔽する蓋体と、
この蓋体の一部に形成されて前記ケースの内圧が所定値
以上に上昇すると破断する安全弁部とを備え、この安全
弁部は前記蓋体の一部を凹ませて所定の厚さの第１の薄
肉部を形成し、この第１の薄肉部が形成された部分を更
に凹ませて前記第１の薄肉部より薄肉の第２の薄肉部を
形成した構成とした。Means for Solving the Problems As a first means for solving the above-mentioned problems, a sealed part with a safety valve according to the present invention comprises:
A case, a lid that hermetically shields the inside of the case,
A safety valve portion formed on a part of the lid and breaking when the internal pressure of the case rises above a predetermined value, wherein the safety valve portion has a first portion having a predetermined thickness by recessing a part of the lid. Is formed, and the portion where the first thin portion is formed is further dented to form a second thin portion thinner than the first thin portion.
【００１１】また、前記課題を解決するための第２の解
決手段として、前記第２の薄肉部は、前記第１の薄肉部
が形成された部分を円形状に凹ませて形成した構成とし
た。As a second means for solving the above-mentioned problem, the second thin portion is formed by denting a portion where the first thin portion is formed into a circular shape. .
【００１２】また、前記課題を解決するための第３の解
決手段として本発明は、ケースの内部を気密に遮蔽可能
な蓋体を有し、この蓋体の一部を凹ませて所定の厚さの
第１の薄肉部を形成する第１の工程と、前記第１の薄肉
部が形成された部分を更に凹ませて前記第１の薄肉部よ
り薄肉の第２の薄肉部を形成する第２の工程とを有する
製造方法とした。According to a third aspect of the present invention, there is provided a lid having a cover capable of hermetically shielding the inside of a case. A first step of forming a first thin portion, and a second step of forming a second thin portion thinner than the first thin portion by further denting the portion where the first thin portion is formed. And a manufacturing method including the two steps.
【００１３】また、前記課題を解決するための第４の解
決手段として、前記第１の工程は、プレス加工で前記蓋
体の一部を凹ませて前記第１の薄肉部を形成し、前記第
２の工程は、前記第１の薄肉部が形成された部分を切削
加工で円形状に凹ませて前記第２の薄肉部を形成するよ
うな製造方法とした。According to a fourth aspect of the present invention, in the first step, a part of the lid is depressed by press working to form the first thin portion. The second step is a manufacturing method in which the portion where the first thin portion is formed is recessed into a circular shape by cutting to form the second thin portion.
【００１４】[0014]
【発明の実施の形態】以下に、本発明の安全弁付密閉部
品とその製造方法の実施の形態について説明する。図１
は本発明に関する安全弁付密閉部品の上面図、図２は本
発明に関する安全弁付密閉部品の要部断面正面図、図３
は本発明の安全弁付密閉部品の安全弁部の３−３断面図
であり、図４、図５は本発明に係わる安全弁部の破断状
況を説明する要部断面図であり、図６、図７は本発明に
関する安全弁付密閉部品の製造方法を説明する概略図で
ある。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a sealing part with a safety valve according to the present invention; FIG.
3 is a top view of a sealing part with a safety valve according to the present invention, FIG. 2 is a sectional front view of a main part of the sealing part with a safety valve according to the present invention, FIG.
Fig. 3 is a sectional view of the safety valve part of the sealing part with a safety valve of the present invention, taken along line 3-3. Figs. FIG. 2 is a schematic view illustrating a method for manufacturing a sealed part with a safety valve according to the present invention.
【００１５】本発明の安全弁付密閉部品１を、例えば角
形のリチウムイオン二次電池に用いたもので図１、２に
基づいて説明すると、安全弁付密閉部品１はリチウムイ
オン二次電池のケース２と、このケース２の内部を気密
に遮蔽する蓋体３に、破断可能な安全弁部４が形成され
ている。前記蓋体３はステンレス材のような導電性金属
板から成り、外形が横長の略矩形に形成され、外周部に
鍔部３ａと、この鍔部３ａの内側を絞り加工等で下方に
突出させて平坦状の遮蔽板３ｂが形成されている。前記
蓋体３の遮蔽板３ｂの表面側の略中央部には、円形状の
安全弁部４が形成されている。The sealing part 1 with a safety valve according to the present invention will be described with reference to FIGS. 1 and 2 using, for example, a rectangular lithium ion secondary battery. The sealing part 1 with a safety valve is a case 2 of a lithium ion secondary battery. In addition, a rupturable safety valve portion 4 is formed on a lid 3 that hermetically shields the inside of the case 2. The lid 3 is made of a conductive metal plate such as a stainless steel material, has an outer shape formed in a horizontally long and substantially rectangular shape, and has a flange 3a on an outer peripheral portion and an inner portion of the flange 3a protruding downward by drawing or the like. Thus, a flat shielding plate 3b is formed. A circular safety valve portion 4 is formed substantially at the center of the cover 3 on the front surface side of the shielding plate 3b.
【００１６】この安全弁部４は、図３に示すように、蓋
体３の遮蔽板３ｂの表面側の一部を凹ませて所定の厚さ
の第１の薄肉部４ａを形成し、この第１の薄肉部４ａが
形成された部分を更に凹ませて、第１の薄肉部４ａより
薄肉の第２の薄肉部４ｂが形成されている。前記蓋体３
は、厚さが１ｍｍ程度に形成されており、第１薄肉部４
ａの厚さが０．１ｍｍ〜０．２ｍｍに形成され、第２薄
肉部４ｂの厚さが略２０μｍの薄膜状に形成されてい
る。そのために、蓋体３は、安全弁部４の第２薄肉部４
ｂが形成された部分が、その他の部分より強度的に弱く
なって、気密に遮蔽したケース２の内部圧力が上昇する
と、薄肉部４ｂが図示上方に膨らむようになっている。As shown in FIG. 3, the safety valve portion 4 forms a first thin portion 4a having a predetermined thickness by recessing a part of the surface of the shielding plate 3b of the lid 3 so as to form a first thin portion 4a. The portion where the one thin portion 4a is formed is further dented to form a second thin portion 4b which is thinner than the first thin portion 4a. The lid 3
Is formed to a thickness of about 1 mm, and the first thin portion 4
The thickness of “a” is formed to be 0.1 mm to 0.2 mm, and the thickness of the second thin portion 4 b is formed as a thin film having a thickness of approximately 20 μm. For this purpose, the lid 3 is attached to the second thin portion 4 of the safety valve portion 4.
When the portion where b is formed becomes weaker in strength than the other portions, and the internal pressure of the airtightly shielded case 2 rises, the thin portion 4b expands upward in the figure.
【００１７】また、蓋体３は、図１に示す安全弁部４の
図示左隣り近傍に、蓋体３の長手方向に延びる中心線Ｘ
と略平行方向に安全弁部４の破断を誘発するための破断
誘発部５が２本形成されている。この破断誘発部５は、
研削加工等により所定の深さに形成されたＶ字状溝から
成り、Ｖ字状の底部５ａが薄肉に形成されて、この破断
誘発部７が形成された部分の蓋体３の強度が弱くなって
いる。そのために、気密に遮蔽したケース２の内部圧力
が上昇すると、破断誘発部５近傍の蓋体３が図示上方に
膨らんで変形し、この変形に誘発されて安全弁部４も変
形して、ケース２内部の圧力上昇が低圧でも、第２の薄
肉部４ｂを容易に破断可能になっている。The cover 3 has a center line X extending in the longitudinal direction of the cover 3 in the vicinity of the safety valve portion 4 shown in FIG.
Two break inducing portions 5 for inducing breakage of the safety valve portion 4 in a direction substantially parallel to the above are formed. This break inducing section 5
A V-shaped groove formed at a predetermined depth by grinding or the like, the V-shaped bottom 5a is formed thin, and the strength of the lid 3 at the portion where the fracture inducing portion 7 is formed is weak. Has become. Therefore, when the internal pressure of the airtightly shielded case 2 rises, the lid 3 near the break inducing portion 5 expands and deforms upward in the drawing, and the safety valve portion 4 is also deformed by the deformation, and the case 2 is deformed. Even if the internal pressure rise is low, the second thin portion 4b can be easily broken.
【００１８】また、蓋体３の遮蔽板３ｂの図示右側に
は、蓋体３を絞り加工等で凹ませた端子取付部６が形成
され、この端子取付部６の下方側に開口部６ａが形成さ
れている。前記端子取付部６には絶縁部材から成る封口
ガスケット（図示せず）が挿入され、この封口ガスケッ
トにより蓋体３と絶縁された陽極端子（図示せず）が開
口部６ａにカシメ等で取り付けられている。このような
安全弁部４を有する蓋体３は、図２に示すケース２に鍔
部２ａの端部が溶接等で取り付けられて、ケース２の内
部が気密に遮蔽されている。前記安全弁付密閉部品１を
用いたリチウム二次電池は、ケース２が電池ケースで構
成され、ケース２の内部に、電池を構成する電解液（図
示せず）、及び内部電極（図示せず）等が密閉されて配
設されている。On the right side of the shielding plate 3b of the cover 3 in the figure, a terminal mounting portion 6 is formed by recessing the cover 3 by drawing or the like. An opening 6a is formed below the terminal mounting portion 6 on the lower side. Is formed. A sealing gasket (not shown) made of an insulating member is inserted into the terminal mounting portion 6, and an anode terminal (not shown) insulated from the lid 3 by the sealing gasket is attached to the opening 6a by caulking or the like. ing. The lid 3 having such a safety valve portion 4 has an end of the flange portion 2a attached to the case 2 shown in FIG. 2 by welding or the like, so that the inside of the case 2 is airtightly shielded. In a lithium secondary battery using the sealed part 1 with a safety valve, the case 2 includes a battery case, and an electrolyte (not shown) constituting the battery and an internal electrode (not shown) are provided inside the case 2. Etc. are arranged in a closed manner.
【００１９】そして、蓋体３でケース２内部が気密に遮
蔽された電池（図示せず）に異常が発生し、図４に示す
ように、電池の内部圧力Ｂが上昇すると、強度的に弱い
安全弁部４の第２の薄肉部４ｂが外側に膨らむ。また、
圧力上昇した内部圧力Ｂによって、破断誘発部５近傍の
蓋体３が上方に押し上げられて変形する。この破断誘発
部５近傍の蓋体３の変形で、安全弁部４の第１の薄肉部
４ａの外周部が変形し、この変形で第２の薄肉部４ｂの
破断が誘発される。そして、第２の薄肉部４ｂが破断す
ると、図５に示すように第２の薄肉部４ｂに破断口４ｃ
が発生し、この破断口４ｃから電池内部の圧力上昇した
内部圧力Ｂが電池外部に逃げて、電池の破裂等を未然に
防ぐことができる。When an abnormality occurs in a battery (not shown) in which the inside of the case 2 is hermetically shielded by the lid 3 and the internal pressure B of the battery rises as shown in FIG. The second thin portion 4b of the safety valve portion 4 expands outward. Also,
Due to the increased internal pressure B, the lid 3 near the fracture inducing portion 5 is pushed upward and deformed. The deformation of the lid 3 near the break inducing portion 5 deforms the outer peripheral portion of the first thin portion 4a of the safety valve portion 4, and the deformation induces the break of the second thin portion 4b. Then, when the second thin portion 4b breaks, as shown in FIG. 5, the break portion 4c is formed in the second thin portion 4b.
Is generated, and the internal pressure B, which has increased in pressure inside the battery, escapes from the breaking hole 4c to the outside of the battery, so that rupture of the battery can be prevented.
【００２０】また、本発明の安全弁付密閉部品の製造方
法を図６、図７に基づいて説明する。まず、蓋体３の一
部を凹ませて所定の厚さの第１の薄肉部４ａを形成する
第１の工程は、図６に示すように、プレス加工で円柱状
の上型７を矢印Ｄ方向に降下させて、下型８に蓋体３の
遮蔽板３ｂを圧縮して第１の薄肉部４ａを形成する。こ
の第１の工程で形成した所定の厚さの第１の薄肉部４ａ
の厚さは、０．１〜０．２ｍｍに形成されている。Further, a method of manufacturing a sealed part with a safety valve according to the present invention will be described with reference to FIGS. First, as shown in FIG. 6, the first step of forming a first thin portion 4a having a predetermined thickness by recessing a part of the lid 3 is to press the cylindrical upper mold 7 with an arrow by pressing. By lowering in the direction D, the shielding plate 3b of the lid 3 is compressed into the lower die 8 to form the first thin portion 4a. First thin portion 4a having a predetermined thickness formed in the first step
Has a thickness of 0.1 to 0.2 mm.
【００２１】また、第１の薄肉部４ａが形成された部分
を更に凹ませて第１の薄肉部４ａより薄肉の第２の薄肉
部４ｂを形成する第２の工程は、第１の薄肉部４ａが形
成された部分を、縦フライス盤に取り付けた切削バイト
９を矢印Ｅ方向に回転させて、切削加工で円形状に凹ま
せて第２の薄肉部４ｂを形成する。この第２の工程で形
成した第２の薄肉部４ｂは、厚さが２０μｍの薄膜状に
形成されている。このような方法で製造された安全弁付
密閉部品１は、プレス加工と切削加工とを組み合わせる
ことにより、第２の工程での切削バイト９による切削
量、及び切削時間を少なくすることができる。そのため
に、第２の工程で形成する第２の薄肉部４ｂが加工硬化
し難くなり、第２の工程の途中で第２の薄肉部４ｂにク
ラックが発生することがない。The second step of forming the second thin portion 4b thinner than the first thin portion 4a by further denting the portion on which the first thin portion 4a is formed includes the first thin portion 4b. By rotating the cutting tool 9 attached to the vertical milling machine in the direction of the arrow E in the portion where the 4a is formed, the second thin portion 4b is formed by cutting in a circular shape by cutting. The second thin portion 4b formed in the second step is formed as a thin film having a thickness of 20 μm. The sealing part 1 with a safety valve manufactured by such a method can reduce the amount of cutting by the cutting tool 9 and the cutting time in the second step by combining the press working and the cutting work. For this reason, the second thin portion 4b formed in the second step is hardly work-hardened, and no crack is generated in the second thin portion 4b during the second step.
【００２２】本発明の安全弁付密閉部品１の実施の形態
では、安全弁部４近傍に破断誘発部５を形成したもので
説明したが、破断誘発部５を設けないで安全弁部４だけ
のものでも良い。また、安全弁部４の円形状の大きさ
は、可能な限り大きくした方が、内部圧力Ｂが低圧で
も、第２の薄肉部４ｂを容易に破断することができる。In the embodiment of the sealed part 1 with a safety valve according to the present invention, the break inducing part 5 is formed in the vicinity of the safety valve part 4. However, the safety part with only the safety valve part 4 without the break inducing part 5 may be used. good. Further, if the size of the circular shape of the safety valve portion 4 is made as large as possible, the second thin portion 4b can be easily broken even if the internal pressure B is low.
【００２３】[0023]
【発明の効果】本発明の安全弁付密閉部品は、第１の薄
肉部が形成された部分を更に凹ませて第１の薄肉部より
薄肉の第２の薄肉部を形成したので、第２の薄肉部を加
工硬化することなく非常に薄い薄膜状に形成することが
できる。そのために、電池の内部圧力が低圧でも、容易
に破断可能な、高性能な安全弁付密閉部品を提供でき
る。According to the sealed part with a safety valve of the present invention, the portion where the first thin portion is formed is further depressed to form a second thin portion thinner than the first thin portion. The thin portion can be formed into a very thin thin film without work hardening. Therefore, it is possible to provide a high-performance sealed part with a safety valve that can be easily broken even when the internal pressure of the battery is low.
【００２４】また、第２の薄肉部は、第１の薄肉部が形
成された部分を円形状に凹ませて形成したので、縦フラ
イス等により切削バイトを回転させて、切削加工で薄膜
状の非常に薄い第２の薄肉部を形成することができる。
そのために、第２の薄肉部を製造するときの切削時間を
短縮できると共に、第２の薄肉部が加工硬化せず、切削
加工途中でクラックが発生することがない。Further, since the second thin portion is formed by denting the portion where the first thin portion is formed into a circular shape, the cutting bit is rotated by a vertical milling machine or the like, and the thin film is formed by cutting. A very thin second thin portion can be formed.
Therefore, the cutting time for manufacturing the second thin portion can be shortened, and the second thin portion does not harden, so that cracks do not occur during cutting.
【００２５】また、本発明の製造方法は、蓋体の一部を
凹ませて所定の厚さの第１の薄肉部を形成する第１の工
程と、前記第１の薄肉部が形成された部分を更に凹ませ
て第１の薄肉部より薄肉の第２の薄肉部を形成する第２
の工程とを有するので、第２の工程で製造する第２の薄
肉部の膜厚のバラツキを小さくすることができ、高性能
な安全弁付密閉部品を提供できる。Further, in the manufacturing method of the present invention, a first step of forming a first thin portion having a predetermined thickness by depressing a part of the lid, and the first thin portion is formed. A second thinner portion that is further dented to form a second thinner portion thinner than the first thinner portion.
Therefore, the variation in the film thickness of the second thin portion manufactured in the second step can be reduced, and a high-performance sealed part with a safety valve can be provided.
【００２６】また、前記第１の工程は、プレス加工で前
記蓋体の一部を凹ませて前記第１の薄肉部を形成し、前
記第２の工程は、前記第１の薄肉部が形成された部分を
切削加工で円形状に凹ませて前記第２の薄肉部を形成す
るようにしたので、第２の薄肉部を形成するときの切削
加工の時間短縮が可能となり、短時間で製造が可能な安
全弁付密閉部品を提供できる。また、第２の薄肉部を短
時間で製造することにより、第２の薄肉部に加工硬化の
発生がなく、加工時に第２の薄肉部にクラックが発生す
ることがない。また、このような製造方法で形成した安
全弁付密閉部品を有する電池を誤って落下させたとして
も、第２の薄肉部が加工硬化してないので、第２の薄肉
部にクラックが発生して破断することがない。In the first step, a part of the lid is depressed by press working to form the first thin portion, and in the second step, the first thin portion is formed. Since the cut portion is cut into a circular shape by cutting to form the second thin portion, the cutting time for forming the second thin portion can be shortened, and the manufacturing time can be reduced. It is possible to provide a sealed part with a safety valve capable of performing the above. Further, since the second thin portion is manufactured in a short time, no work hardening occurs in the second thin portion, and no crack occurs in the second thin portion during processing. Further, even if a battery having a sealed part with a safety valve formed by such a manufacturing method is dropped by mistake, cracks occur in the second thin portion because the second thin portion is not work hardened. Does not break.
【図１】本発明の安全弁付密閉部品の上面図である。FIG. 1 is a top view of a sealing part with a safety valve of the present invention.
【図２】本発明の安全弁付密閉部品の要部断面正面図で
ある。FIG. 2 is a sectional front view of a main part of the sealing part with a safety valve according to the present invention.
【図３】図１に示す３−３断面図である。FIG. 3 is a sectional view taken along line 3-3 shown in FIG.
【図４】本発明の安全弁付密閉部品の安全弁部の破断状
況を説明する要部断面図である。FIG. 4 is a cross-sectional view of a main part illustrating a state of breakage of a safety valve portion of the sealing part with a safety valve according to the present invention.
【図５】本発明の安全弁付密閉部品の安全弁部の破断状
況を説明する要部断面図である。FIG. 5 is a cross-sectional view of a main part illustrating a state of breakage of a safety valve portion of the sealing part with a safety valve according to the present invention.
【図６】本発明に関する安全弁付密閉部品の製造方法を
説明する概略図である。FIG. 6 is a schematic view illustrating a method for manufacturing a sealed part with a safety valve according to the present invention.
【図７】本発明に関する安全弁付密閉部品の製造方法を
説明する概略図である。FIG. 7 is a schematic diagram illustrating a method for manufacturing a sealed part with a safety valve according to the present invention.
【図８】従来の安全弁付密閉部品の要部断面図である。FIG. 8 is a sectional view of a main part of a conventional sealing part with a safety valve.
１ 安全弁付密閉部品 ２ ケース ３ 蓋体 ３ａ 鍔部 ３ｂ 遮蔽板 ４ 安全弁部 ４ａ 第１の薄肉部 ４ｂ 第２の薄肉部 ４ｃ 破断口 ５ 蓋体変形誘発部 ５ａ 底部 ６ 端子取付部 ６ａ 開口部 ７ 上型 ８ 下型 ９ 切削バイト DESCRIPTION OF SYMBOLS 1 Sealing part with a safety valve 2 Case 3 Lid 3a Flange 3b Shielding plate 4 Safety valve 4a First thin part 4b Second thin part 4c Break opening 5 Lid deformation inducing part 5a Bottom part 6 Terminal mounting part 6a Opening part 7 Upper die 8 Lower die 9 Cutting tool
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H011 AA09 CC06 DD03 DD07 KK01 5H012 AA01 AA07 BB02 DD05 DD17 EE04 FF01 GG01 JJ06 JJ10 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H011 AA09 CC06 DD03 DD07 KK01 5H012 AA01 AA07 BB02 DD05 DD17 EE04 FF01 GG01 JJ06 JJ10
Claims (4)
蔽する蓋体と、この蓋体の一部に形成されて前記ケース
の内圧が所定値以上に上昇すると破断する安全弁部とを
備え、この安全弁部は前記蓋体の一部を凹ませて所定の
厚さの第１の薄肉部を形成し、この第１の薄肉部が形成
された部分を更に凹ませて前記第１の薄肉部より薄肉の
第２の薄肉部を形成したことを特徴とする安全弁付密閉
部品。1. A case, a lid for hermetically shielding the inside of the case, and a safety valve portion formed on a part of the lid and breaking when an internal pressure of the case rises to a predetermined value or more, In this safety valve portion, a part of the lid is recessed to form a first thin portion having a predetermined thickness, and the portion in which the first thin portion is formed is further recessed to form the first thin portion. A sealed part with a safety valve, characterized in that a thinner second thin portion is formed.
が形成された部分に外周形状を円形状に凹ませて形成し
たことを特徴とする請求項１記載の安全弁付密閉部品。2. The sealed part with a safety valve according to claim 1, wherein the second thin portion is formed by depressing an outer peripheral shape in a circular shape at a portion where the first thin portion is formed. .
有し、この蓋体の一部を凹ませて所定の厚さの第１の薄
肉部を形成する第１の工程と、前記第１の薄肉部が形成
された部分を更に凹ませて前記第１の薄肉部より薄肉の
第２の薄肉部を形成する第２の工程とを有することを特
徴とする安全弁付密閉部品の製造方法。A first step of forming a first thin portion having a predetermined thickness by depressing a part of the lid, the lid having a lid capable of hermetically shielding the inside of the case; A second step of forming a second thinner portion thinner than the first thinner portion by further denting the portion where the first thinner portion is formed. Method.
体の一部を凹ませて前記第１の薄肉部を形成し、前記第
２の工程は、前記第１の薄肉部が形成された部分を切削
加工で円環状に凹ませて前記第２の薄肉部を形成するよ
うにしたことを特徴とする請求項３記載の安全弁付密閉
部品の製造方法。4. The first step is to form the first thin portion by depressing a part of the lid by pressing, and the second step is to form the first thin portion. The method for manufacturing a sealed part with a safety valve according to claim 3, wherein the second thin portion is formed by cutting the formed portion into an annular shape by cutting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000255750A JP2002063888A (en) | 2000-08-22 | 2000-08-22 | Sealing component with safety valve, and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000255750A JP2002063888A (en) | 2000-08-22 | 2000-08-22 | Sealing component with safety valve, and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002063888A true JP2002063888A (en) | 2002-02-28 |
Family
ID=18744482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000255750A Withdrawn JP2002063888A (en) | 2000-08-22 | 2000-08-22 | Sealing component with safety valve, and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002063888A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012160312A (en) * | 2011-01-31 | 2012-08-23 | Gs Yuasa Corp | Battery |
| WO2012165338A1 (en) * | 2011-05-31 | 2012-12-06 | 日立ビークルエナジー株式会社 | Rectangular battery |
| JP2014049398A (en) * | 2012-09-04 | 2014-03-17 | Kojima Press Industry Co Ltd | Case for secondary battery and secondary battery |
| JP2014209490A (en) * | 2010-10-13 | 2014-11-06 | 株式会社ソーデナガノ | Method of manufacturing lid for battery case and lid for battery case |
| KR20150004747A (en) * | 2013-07-03 | 2015-01-13 | 가부시키가이샤 고베 세이코쇼 | Battery case and method for forming a safety valve of the battery case |
| JP2016051656A (en) * | 2014-09-01 | 2016-04-11 | 株式会社豊田自動織機 | Power storage device |
| JP2021511965A (en) * | 2018-01-18 | 2021-05-13 | ポムチョン プレシジョン カンパニー リミテッドＢｕｍｃｈｕｎ Ｐｒｅｃｉｓｉｏｎ Ｃｏ．，Ｌｔｄ． | Secondary battery cap plate Safety valve manufacturing method and manufacturing equipment, cap plate manufacturing method using the safety valve manufacturing method, secondary battery cap plate manufactured by the cap plate manufacturing method |
| US11640880B2 (en) | 2017-12-12 | 2023-05-02 | Gs Yuasa International Ltd. | Energy storage device |
-
2000
- 2000-08-22 JP JP2000255750A patent/JP2002063888A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014209490A (en) * | 2010-10-13 | 2014-11-06 | 株式会社ソーデナガノ | Method of manufacturing lid for battery case and lid for battery case |
| JP2012160312A (en) * | 2011-01-31 | 2012-08-23 | Gs Yuasa Corp | Battery |
| CN103597630A (en) * | 2011-05-31 | 2014-02-19 | 日立车辆能源株式会社 | Rectangular battery |
| JP2012252809A (en) * | 2011-05-31 | 2012-12-20 | Hitachi Vehicle Energy Ltd | Rectangular storage battery |
| EP2738836A1 (en) * | 2011-05-31 | 2014-06-04 | Hitachi Vehicle Energy, Ltd. | Rectangular battery |
| WO2012165338A1 (en) * | 2011-05-31 | 2012-12-06 | 日立ビークルエナジー株式会社 | Rectangular battery |
| EP2738836A4 (en) * | 2011-05-31 | 2015-04-22 | Hitachi Automotive Systems Ltd | Rectangular battery |
| JP2014049398A (en) * | 2012-09-04 | 2014-03-17 | Kojima Press Industry Co Ltd | Case for secondary battery and secondary battery |
| KR20150004747A (en) * | 2013-07-03 | 2015-01-13 | 가부시키가이샤 고베 세이코쇼 | Battery case and method for forming a safety valve of the battery case |
| KR101616621B1 (en) | 2013-07-03 | 2016-04-28 | 가부시키가이샤 고베 세이코쇼 | Battery case and method for forming a safety valve of the battery case |
| JP2016051656A (en) * | 2014-09-01 | 2016-04-11 | 株式会社豊田自動織機 | Power storage device |
| US11640880B2 (en) | 2017-12-12 | 2023-05-02 | Gs Yuasa International Ltd. | Energy storage device |
| JP2021511965A (en) * | 2018-01-18 | 2021-05-13 | ポムチョン プレシジョン カンパニー リミテッドＢｕｍｃｈｕｎ Ｐｒｅｃｉｓｉｏｎ Ｃｏ．，Ｌｔｄ． | Secondary battery cap plate Safety valve manufacturing method and manufacturing equipment, cap plate manufacturing method using the safety valve manufacturing method, secondary battery cap plate manufactured by the cap plate manufacturing method |
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