JPH10284033A - Manufacture of safety valve of lithium ion battery - Google Patents
Manufacture of safety valve of lithium ion batteryInfo
- Publication number
- JPH10284033A JPH10284033A JP9087994A JP8799497A JPH10284033A JP H10284033 A JPH10284033 A JP H10284033A JP 9087994 A JP9087994 A JP 9087994A JP 8799497 A JP8799497 A JP 8799497A JP H10284033 A JPH10284033 A JP H10284033A
- Authority
- JP
- Japan
- Prior art keywords
- safety valve
- metal material
- metal foil
- lithium ion
- ion battery
- 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.)
- Pending
Links
Classifications
-
- 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
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はリチウムイオン電池
の端子近傍に電池を密封するように配設され、電池内に
異常圧が生じると弁が破損して異常圧を外部に逃がすリ
チウムイオン電池の安全弁の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion battery which is disposed near a terminal of the lithium ion battery so as to hermetically seal the valve. When an abnormal pressure is generated in the battery, the valve is broken and the abnormal pressure is released to the outside. The present invention relates to a method for manufacturing a safety valve.
【０００２】[0002]
【従来の技術】今日、携帯電話、パーソナルコンピュー
ターなどの電子機器には、バッテリーとして様々な電池
が用いられている。例えば、アルカリ電池やマンガン電
池などの一次電池や、充放電可能なリチウムイオン電
池、ニカド電池などの二次電池が広く用いられている。
これらのうち、とりわけ高出力（例えば３．６Ｖ程度）
が得られ、しかも充放電を繰り返しても充電履歴が良い
ことから、リチウムイオン電池が広く用いられるように
なってきた。上記リチウムイオン電池は、電池内の圧力
が通常２ｋｇｆ／ｃｍ2 程度に保たれているが、電池内
部に高熱が発生し、異常圧が生ずるおそれがあることか
ら、この異常圧を放置しておくと電池本体が爆発する危
険性がある。このため、通常リチウムイオン電池の一方
の端子（例えば正極端子側）に安全弁が設けられてい
る。この安全弁は一般に１３ｋｇｆ／ｃｍ2 〜２０ｋｇ
ｆ／ｃｍ2 の異常圧が生じたときに破壊されて異常圧を
外部に逃がすように設定されている。2. Description of the Related Art Today, various batteries are used as batteries in electronic devices such as mobile phones and personal computers. For example, primary batteries such as alkaline batteries and manganese batteries, and secondary batteries such as chargeable / dischargeable lithium-ion batteries and nickel-cadmium batteries are widely used.
Among them, particularly high output (for example, about 3.6 V)
Thus, lithium ion batteries have come to be widely used because of their good charge history even after repeated charging and discharging. In the above-mentioned lithium ion battery, the pressure inside the battery is usually maintained at about 2 kgf / cm 2. However, since high heat is generated inside the battery and an abnormal pressure may be generated, this abnormal pressure is left as it is. There is a danger of the battery body exploding. For this reason, a safety valve is usually provided at one terminal (for example, the positive terminal side) of the lithium ion battery. This safety valve is generally 13 kgf / cm 2 -20 kg
When an abnormal pressure of f / cm 2 is generated, the pressure is destroyed and the abnormal pressure is released to the outside.
【０００３】上記リチウムイオン電池の安全弁の一例に
ついて、図７を参照して説明する。図７はリチウムイオ
ン電池５１の正極端子側を示すもので、正極端子５２の
下方に厚さ４０μｍ程度のアルミ箔５３が電池内外を閉
塞するように設けられている。上記正極端子５２及びア
ルミ箔５３はその周縁部において、ガスケット５４を介
して電池本体５５に一体にかしめられて電池本体に固定
され、正極側端子部が形成されている。[0003] An example of the safety valve of the lithium ion battery will be described with reference to FIG. FIG. 7 shows the positive electrode terminal side of the lithium ion battery 51. An aluminum foil 53 having a thickness of about 40 μm is provided below the positive electrode terminal 52 so as to close the inside and outside of the battery. The positive electrode terminal 52 and the aluminum foil 53 are integrally crimped to the battery main body 55 via a gasket 54 at the peripheral portions thereof and fixed to the battery main body, thereby forming a positive terminal part.
【０００４】上記正極端子５２とアルミ箔５３との間に
はＰＴＣ素子５６が介在しており、電気的導通が取られ
ている。このＰＴＣ素子５６は、カーボン入りプラスチ
ック（導電性プラスチック材）の両側にニッケル層を設
けたものであり、常温では通電性を有するが、加熱され
ると膨張して電気的導通を遮断するものである。また、
上記アルミ箔５３は、中央部に貫通穴５７が形成された
ラプチャー板（アルミニウム板）５８に支持されてお
り、該アルミ箔５３は上記貫通穴５７に垂れ下がるよう
に入り込んでラプチャー板５８の下面に連結されたタブ
５９と接点６０で接続されている。上記タブ５９は、電
池内と端子側との電流路を形成するもので、電流は上記
タブ５９よりアルミ箔５３、ＰＴＣ素子５６を経て正極
端子５２へと流れる。[0004] A PTC element 56 is interposed between the positive electrode terminal 52 and the aluminum foil 53 to establish electrical continuity. The PTC element 56 is provided with nickel layers on both sides of a carbon-containing plastic (conductive plastic material). The PTC element 56 has electrical conductivity at room temperature, but expands when heated to cut off electrical conduction. is there. Also,
The aluminum foil 53 is supported by a rupture plate (aluminum plate) 58 having a through-hole 57 formed in the center thereof. The aluminum foil 53 penetrates into the through-hole 57 so as to hang down on the lower surface of the rupture plate 58. It is connected to the connected tab 59 by a contact point 60. The tab 59 forms a current path between the inside of the battery and the terminal side, and a current flows from the tab 59 to the positive terminal 52 via the aluminum foil 53 and the PTC element 56.
【０００５】上記アルミ箔５３には、所定圧で破壊され
るように強度を弱めるような加工が施されている。即
ち、上記アルミ箔５３には、上記ラプラャー板５８の貫
通穴５７の近傍に厚さが薄肉、例えば１５μｍ程度とな
るようなＶノッチ６１が形成されている。そして、リチ
ウムイオン電池内に異常圧が生じた際には、上記アルミ
箔５３は上記Ｖノッチ６１で破壊されて異常圧を逃がす
ように構成されている。上記アルミ箔５３には、一般に
プレス加工によりＶノッチ６１が形成され、該Ｖノッチ
６１の厚さ管理やアルミ箔５３の取扱いも難しいことか
ら、上記アルミ箔５３はある程度の厚さ（４０μｍ程
度）を有するものが用いられる。また、上記アルミ箔５
３の強度を弱める方法としては、ラプラャー板５８など
の金属プレートに対してプレスにより圧接して部分的に
薄肉となるように加工して強度を弱めるように構成する
ことも可能である。[0005] The aluminum foil 53 is subjected to a process of weakening the strength so as to be broken at a predetermined pressure. That is, in the aluminum foil 53, a V-notch 61 having a small thickness, for example, about 15 μm, is formed in the vicinity of the through-hole 57 of the Lapler plate 58. When an abnormal pressure occurs in the lithium ion battery, the aluminum foil 53 is broken by the V notch 61 to release the abnormal pressure. The aluminum foil 53 is generally formed with a V-notch 61 by press working, and it is difficult to control the thickness of the V-notch 61 and handle the aluminum foil 53. Therefore, the aluminum foil 53 has a certain thickness (about 40 μm). Is used. In addition, the above aluminum foil 5
As a method of reducing the strength of No. 3, it is also possible to reduce the strength by press-contacting a metal plate such as the Rapler plate 58 by pressing so as to be partially thinned.
【０００６】[0006]
【発明が解決しようとする課題】上記従来技術に示す安
全弁を製造するためには、アルミ箔５３に対して直にプ
レス加工を施してＶノッチ６１を形成された後、正極端
子５２やＰＴＣ素子５６と共に周縁部において、ガスケ
ット５４を介して電池本体５５にかしめられるため、ア
ルミ箔５３にある程度の厚さがあるとはいえ薄い材料で
あるため単体では取扱い難く、安全弁の自動組立化も図
り難い。しかも組立工数がかかるため組み立てに手間取
り、製造コストも上昇する。また、上記安全弁の製造工
程において、アルミ箔５３が表面に露出する部分が多い
ため、製造工程で傷やしわが生じ易く、信頼性が低下し
たり、歩留りも低下するおそれがあった。In order to manufacture the safety valve shown in the above prior art, an aluminum foil 53 is directly pressed to form a V notch 61, and then a positive electrode terminal 52 and a PTC element are formed. Since the aluminum foil 53 has a certain thickness but is a thin material, it is difficult to handle it alone, and it is difficult to automatically assemble the safety valve because the aluminum foil 53 is a thin material because it is caulked to the battery main body 55 via the gasket 54 at the peripheral edge together with the 56. . In addition, assembling man-hours require much time for assembling and increase the manufacturing cost. Further, in the manufacturing process of the safety valve, since there are many portions where the aluminum foil 53 is exposed on the surface, scratches and wrinkles are liable to occur in the manufacturing process, and there is a possibility that the reliability is reduced and the yield is reduced.
【０００７】そこで、本発明の目的は、上記従来技術の
課題を解決し、信頼性が高く取扱い性の良い安全弁を、
組立性良くしかもコストを削減して製造可能にしたリチ
ウムイオン電池の安全弁の製造方法を提供する。Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a highly reliable and easy-to-handle safety valve.
Provided is a method for manufacturing a safety valve for a lithium ion battery, which can be manufactured with good assemblability and at a reduced cost.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記目的を達
成するに次の構成を備える。即ち、リチウムイオン電池
の端子近傍に電池を密封するように配設され、電池内に
異常圧が生じると弁が破壊されて異常圧を外部に逃がす
リチウムイオン電池の安全弁の製造方法において、貫通
穴を所定間隔で搬送方向に形成した長尺状金属材をプレ
ス部へピッチ送りする長尺状金属材搬送工程と、長尺状
金属箔を前記長尺状金属材の搬送動作と同期取りし、か
つ該長尺状金属材と交差するように前記プレス部へ搬送
する長尺状金属箔搬送工程と、前記プレス部で前記長尺
状金属材と長尺状金属箔を積層した状態で打ち抜いて、
前記長尺状金属箔により前記貫通穴を密閉する打ち抜き
工程と、前記貫通穴の周囲を抵抗溶接する溶接工程とを
有することを特徴とする。また、前記打ち抜き工程に先
立って、前記長尺状金属材に貫通穴を所定間隔で搬送方
向に穿孔する穴開け工程を有していても良い。The present invention has the following configuration to achieve the above object. That is, in a method for manufacturing a safety valve for a lithium ion battery, which is disposed so as to seal the battery near the terminals of the lithium ion battery and breaks the valve when an abnormal pressure is generated in the battery, the abnormal pressure is released to the outside. A long metal material transporting step of pitch-feeding a long metal material formed in the transport direction at predetermined intervals to the press unit, and synchronizing the long metal foil with the transport operation of the long metal material, And a long metal foil transporting step of transporting to the press section so as to intersect with the long metal material, and punching out the laminated state of the long metal material and the long metal foil in the press section. ,
A punching step of sealing the through hole with the long metal foil and a welding step of resistance welding around the through hole are provided. In addition, prior to the punching step, a punching step of punching through holes in the long metal material at predetermined intervals in a transport direction may be provided.
【０００９】また、第１貫通穴を所定間隔で搬送方向に
形成した第１長尺状金属材をプレス部へピッチ送りする
第１長尺状金属材搬送工程と、長尺状金属箔を前記第１
長尺状金属材の搬送動作と同期取りし、かつ該第１長尺
状金属材と交差するように前記プレス部へ搬送する長尺
状金属箔搬送工程と、前記第１貫通穴と連通可能な第２
貫通穴を所定間隔で搬送方向に形成した第２長尺状金属
材を、前記第１長尺状金属材の搬送動作と同期取りし、
かつ該第１長尺状金属材と交差するように前記プレス部
へ搬送する第２長尺状金属材搬送工程と、前記プレス部
で第１長尺状金属材、長尺状金属箔及び第２長尺状金属
材を積層した状態で打ち抜いて、前記長尺状金属箔によ
り前記第１，第２貫通穴を密閉する打ち抜き工程とを有
することを特徴とする。また、前記長尺状金属箔搬送工
程と第２長尺状金属材搬送工程との間に、前記長尺状金
属箔を所定長に切断する切断工程を有していても良い。
また、前記打ち抜き工程に先立って、前記第１，第２長
尺状金属材に第１，第２貫通穴を所定間隔で搬送方向に
それぞれ穿孔する穴開け工程と、前記第１貫通穴及び第
２貫通穴の周囲に凹部及び凸部をそれぞれ形成する凹凸
部形成工程とを有していても良い。また、前記打ち抜き
工程において、前記第１，第２長尺状金属材の対向面側
にそれぞれ形成された前記凹部及び凸部で前記長尺状金
属箔を噛み込むように前記プレス部でかしめて該長尺状
金属箔により前記第１，第２貫通穴を密閉するのが望ま
しい。また、前記打ち抜き工程の後、第１，第２長尺状
金属材の第１，第２貫通穴の近傍を抵抗溶接する溶接工
程を備えていても良い。また、前記金属箔としてアルミ
箔を用いるのが望ましい。A first elongate metal material conveying step of feeding a first elongate metal material having first through-holes formed at predetermined intervals in a conveying direction to a press section at a pitch; First
A long metal foil conveying step of synchronizing with the conveying operation of the long metal material and conveying the long metal material to the press section so as to intersect with the first long metal material, and communicating with the first through hole; The second
A second elongated metal material having through holes formed at predetermined intervals in the transport direction is synchronized with the transport operation of the first elongated metal material,
And a second elongate metal material conveying step of conveying the first elongate metal material to the press portion so as to intersect with the first elongate metal material, and a first elongate metal material, an elongate metal foil and a second elongate metal foil at the press portion. (2) a punching step of punching in a state where the long metal materials are laminated, and sealing the first and second through holes with the long metal foil. Further, a cutting step of cutting the long metal foil into a predetermined length may be provided between the long metal foil transferring step and the second long metal material transferring step.
In addition, prior to the punching step, a hole forming step of forming first and second through holes in the first and second long metal members at predetermined intervals in a transport direction, and the first and second through holes are formed. (2) forming a concave and convex portion around the through hole and forming a concave portion and a convex portion, respectively. Further, in the punching step, the pressing portion is swaged so as to bite the long metal foil in the concave portions and the convex portions formed on the facing surfaces of the first and second long metal materials, respectively. It is desirable that the first and second through holes are sealed with the long metal foil. Further, after the punching step, a welding step of resistance welding the vicinity of the first and second through holes of the first and second elongated metal materials may be provided. Also, it is desirable to use an aluminum foil as the metal foil.
【００１０】[0010]
【発明の実施の形態】以下、本発明にかかる好適な実施
の態様を添付図面と共に詳細に説明する。図１は安全弁
の正面図、図２は図１の安全弁の上視図及び部分断面
図、図３はリチウムイオン電池の構成を示す部分断面
図、図４は安全弁の破壊圧力を示すグラフ図、図５は安
全弁の製造工程を示す説明図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. 1 is a front view of a safety valve, FIG. 2 is a top view and a partial cross-sectional view of the safety valve of FIG. 1, FIG. 3 is a partial cross-sectional view showing a configuration of a lithium ion battery, and FIG. 4 is a graph showing a burst pressure of the safety valve. FIG. 5 is an explanatory view showing a manufacturing process of the safety valve.
【００１１】先ず、図３を参照してリチウムイオン電池
の概略構成について説明する。１はリチウムイオン電池
本体であり、上方に正極端子２、下方に負極端子３がそ
れぞれ形成されている。この電池本体１には、例えば厚
さ０．３ｍｍ程度のスチール材にニッケルメッキを施し
たものが用いられる。上記正極端子２はドーム形状をし
た導電性金属材料、例えば厚さ０．４ｍｍ程度のステン
レススチール（ＳＵＳ）が好適に用いられ、該正極端子
２の周囲には、電池内の異常圧を外部に逃がすための逃
げ穴４が形成されている。５はＰＴＣ素子であって、カ
ーボン入りプラスチック（導電性プラスチック材）の両
側にニッケル層を設けたものであり、常温では通電性を
有するが加熱されると膨張して電気的導通を遮断する。
このＰＴＣ素子５は、厚さ０．３ｍｍ程度でドーナツ形
状をしており、上記正極端子２の周縁部に沿って積層さ
れる。First, a schematic configuration of a lithium ion battery will be described with reference to FIG. Reference numeral 1 denotes a lithium ion battery main body, in which a positive electrode terminal 2 is formed above and a negative electrode terminal 3 is formed below. The battery body 1 is made of, for example, a steel material having a thickness of about 0.3 mm and plated with nickel. The positive electrode terminal 2 is preferably made of a dome-shaped conductive metal material, for example, stainless steel (SUS) having a thickness of about 0.4 mm. An escape hole 4 for escape is formed. Reference numeral 5 denotes a PTC element, which is provided with nickel layers on both sides of a carbon-containing plastic (conductive plastic material). The nickel layer has electrical conductivity at room temperature, but expands when heated to cut off electrical conduction.
The PTC element 5 has a donut shape with a thickness of about 0.3 mm, and is laminated along the periphery of the positive electrode terminal 2.
【００１２】６は安全弁であり、第１金属支持板６ａ、
金属箔６ｂ及び第２金属支持板６ｃを積層してなる。上
記金属箔６ｂは、導電性を有する金属材料、例えば銅箔
等であってもよいが、通電性が良く、軽量で製造コスト
が安いため、アルミ箔が好適に用いられる。上記第１，
第２金属支持板６ａ，６ｃとしては、導電性を有する金
属材料が用いられるが、金属箔６ｂとして用いられるア
ルミ箔とのなじみ易さから各々厚さ０．３ｍｍ程度のア
ルミニウム板が好適に用いられる。上記安全弁６は電池
内外を遮蔽しており、電池内に生じた所定の異常圧によ
り上記金属箔６ｂが破壊されるように構成されている。
上記正極端子２、ＰＴＣ素子５及び安全弁６は、周縁部
を揃えるように重ね合わされてガスケット７を介して電
池本体１と共に一体にかしめられて、電池の正極側端部
が形成されている。上記ガスケット７は、例えばポリプ
ロピレン等の絶縁材料が好適に用いられる。Reference numeral 6 denotes a safety valve, which is a first metal support plate 6a,
It is formed by laminating a metal foil 6b and a second metal support plate 6c. The metal foil 6b may be a conductive metal material, for example, a copper foil or the like, but an aluminum foil is preferably used because it has good electrical conductivity, is lightweight, and has a low manufacturing cost. The first,
As the second metal support plates 6a and 6c, a metal material having conductivity is used. However, an aluminum plate having a thickness of about 0.3 mm is preferably used because it is easily compatible with the aluminum foil used as the metal foil 6b. Can be The safety valve 6 shields the inside and outside of the battery, and is configured such that the metal foil 6b is broken by a predetermined abnormal pressure generated in the battery.
The positive electrode terminal 2, the PTC element 5, and the safety valve 6 are overlapped so that their peripheral portions are aligned, and caulked together with the battery main body 1 via a gasket 7 to form a positive electrode end of the battery. The gasket 7 is preferably made of an insulating material such as polypropylene.
【００１３】また、上記安全弁６の第２金属支持板６ｃ
にはタブ８が接続されており、このタブ８は電池内と正
極端子２側との電流路を形成している。上記タブ８とし
ては、導電性金属材料、例えばアルミニウム材が好適に
用いられる。電流は上記タブ８より第２金属支持板６
ｃ、金属箔６ｂ、第１金属支持板６ａ、ＰＴＣ素子５を
経て正極端子２へと流れる。The second metal support plate 6c of the safety valve 6
Is connected to a tab 8, and this tab 8 forms a current path between the inside of the battery and the positive electrode terminal 2 side. As the tab 8, a conductive metal material, for example, an aluminum material is preferably used. The current is supplied from the tab 8 to the second metal support plate 6.
c, the metal foil 6b, the first metal support plate 6a, and the PTC element 5 to flow to the positive electrode terminal 2.
【００１４】次に、上記安全弁６の構成について、図１
及び図２を参照してより詳細に説明する。安全弁６は、
中心部に異常圧を逃がすための第１貫通穴６ｄを開けた
第１金属支持板６ａと、前記第１金属支持板６ａの第１
貫通穴６ｄを塞ぐように積層して一体に支持された金属
箔６ｂと、該金属箔６ｂの上に前記第１金属支持板６ａ
の第１貫通穴６ｄと連通可能な第２貫通穴６ｅ形成され
た第２金属支持板６ｃを積層して、前記金属箔６ｂを両
側より第１，第２金属支持板６ａ，６ｃにより挟持する
よう３層に積層して形成されている。Next, the configuration of the safety valve 6 will be described with reference to FIG.
This will be described in more detail with reference to FIG. The safety valve 6
A first metal support plate 6a having a first through hole 6d for releasing abnormal pressure at a central portion, and a first metal support plate 6a
A metal foil 6b laminated and integrally supported so as to cover the through hole 6d; and the first metal support plate 6a on the metal foil 6b.
The second metal support plate 6c formed with the second through hole 6e that can communicate with the first through hole 6d is laminated, and the metal foil 6b is sandwiched between the first and second metal support plates 6a and 6c from both sides. And three layers.
【００１５】また、図２に示すように、上記第１，第２
金属支持板６ａ，６ｃには、周方向に複数箇所または全
周に渡って凹部６ｆ，凸部６ｇがそれぞれ形成されてい
る。この凹部６ｆ，凸部６ｇは、高さが０．１ｍｍ〜
０．１５ｍｍ程度に形成されており、第１，第２金属支
持板６ａ，６ｃ間に金属箔６ｂを挟むよう積層してプレ
スすることにより、上記凹部６ｆ，凸部６ｇが嵌合する
ようかしめて前記金属箔６ｂにより前記第１，第２貫通
穴６ｄ，６ｅの密閉性を高めて一体化されている。上記
凹部６ｆ，凸部６ｇにより薄い金属箔６ｂを挟圧するた
め、凹凸部の先端にはＲが形成されているのが好まし
い。また、上記第１，第２金属支持板６ａ，６ｃの中心
部に形成された第１，第２貫通穴６ｄ，６ｅの近傍に
は、周囲を抵抗溶接された溶接部６ｈが形成されてお
り、前記第１，第２貫通穴６ｄ，６ｅを閉塞する前記金
属箔６ｂの密閉性を確実にしている。Further, as shown in FIG.
The metal support plates 6a and 6c are provided with a concave portion 6f and a convex portion 6g respectively at a plurality of positions or over the entire circumference in the circumferential direction. The concave portion 6f and the convex portion 6g have a height of 0.1 mm to
It is formed so as to have a thickness of about 0.15 mm, and is pressed so as to sandwich the metal foil 6b between the first and second metal support plates 6a and 6c so that the concave portion 6f and the convex portion 6g fit. The first and second through-holes 6d and 6e are integrated with the metal foil 6b while the sealing property is enhanced. In order to sandwich the thin metal foil 6b between the concave portion 6f and the convex portion 6g, it is preferable that an R is formed at the tip of the concave and convex portion. In the vicinity of the first and second through holes 6d and 6e formed at the center of the first and second metal support plates 6a and 6c, a welded portion 6h whose periphery is resistance-welded is formed. In addition, the metal foil 6b for closing the first and second through holes 6d and 6e is ensured to be airtight.
【００１６】上記金属箔６ｂにより、第１貫通穴６ｄ及
び第２貫通穴６ｅの開口を閉塞することにより、電池内
部と正極端子２側とを遮蔽している。上記金属箔６ｂと
しては穴径にもよるが２０μｍの厚さを有するアルミ箔
が好適に用いられる。また上記第１，第２金属支持板６
ａ，６ｃの第１，第２貫通穴６ｄ，６ｅの穴径は２．５
ｍｍに設定されている。一般にリチウムイオン電池は通
常２ｋｇｆ／ｃｍ2 の内圧が生じており、加熱により内
圧が１０ｋｇｆ／ｃｍ2 以上となる異常圧が生ずる。こ
の異常圧を逃がすため、上記金属箔６ｂが所定圧力範囲
或いは所定圧力で破壊されることが望ましい。The inside of the battery and the side of the positive electrode terminal 2 are shielded by closing the openings of the first through hole 6d and the second through hole 6e with the metal foil 6b. As the metal foil 6b, an aluminum foil having a thickness of 20 μm is preferably used, though it depends on the hole diameter. The first and second metal support plates 6
The hole diameter of the first and second through holes 6d and 6e of the holes a and 6c is 2.5.
mm. In general, an internal pressure of a lithium ion battery is usually 2 kgf / cm 2 , and an abnormal pressure that causes an internal pressure of 10 kgf / cm 2 or more is generated by heating. In order to release the abnormal pressure, it is desirable that the metal foil 6b be broken in a predetermined pressure range or a predetermined pressure.
【００１７】この安全弁６は、図４のグラフ図に示すよ
うに、金属箔６ｂの厚みと第１，第２金属板６ａ，６ｃ
の穴径により一定の圧力で金属箔６ｂが破壊されるよう
に精度が保たれている。即ち、上記金属箔６ｂの厚みと
穴径との関係は、製品によっても異なるが、穴径が２．
５ｍｍ、アルミ箔の厚さが２０μｍのもので破壊圧力は
１４ｋｇｆ／ｃｍ2 〜１７ｋｇｆ／ｃｍ2 の範囲、より
好ましくは１５ｋｇｆ／ｃｍ2 で確実に破壊されるよ
う、製品毎に高精度に破壊圧力が設定できた。尚、グラ
フ図では圧力が１１ｋｇｆ／ｃｍ2 〜１３ｋｇｆ／ｃｍ
2 については、データを図示してないが、アルミ箔が破
壊されるまでの時間（平均値）が長くなり、製品毎のば
らつきも大きくなるため図示するのを省略した。As shown in the graph of FIG. 4, the safety valve 6 has the thickness of the metal foil 6b and the first and second metal plates 6a and 6c.
Accuracy is maintained so that the metal foil 6b is broken at a constant pressure by the hole diameter of. That is, the relationship between the thickness of the metal foil 6b and the hole diameter differs depending on the product, but the hole diameter is set to 2.V.
5 mm, breaking pressure in what thickness is 20μm is 14kgf / cm 2 ~17kgf / cm 2 in the range of aluminum foil, and more preferably to be securely destroyed 15 kgf / cm 2, breaking pressure with high accuracy on the product Was set. In the graph, the pressure is 11 kgf / cm 2 to 13 kgf / cm.
Although data is not shown in FIG. 2, the time (average value) until the aluminum foil is destroyed becomes longer and the variation among products becomes larger.
【００１８】従来は金属箔にＶノッチを形成して厚さ管
理をしており、加工精度にばらつきが生じ易かった。こ
れに対し、本実施例は金属箔６ｂそのものの厚さを変え
るだけで破壊圧力の調整ができるため、製品毎の金属箔
６ｂの厚み管理がし易く、また第１，第２金属支持板６
ａ，６ｃの穴径もプレス加工により精度を出し易いた
め、これらの組合せにより安全弁６の破壊圧力も製品毎
のばらつきが少なく高精度に設定可能となる。また、上
記金属箔６ｂの厚さを薄くするほど取扱い性が難しくな
るが、上記金属箔６ｂは第１，第２金属支持板６ａ，６
ｃにより挟持するように３層構造で形成され、上記金属
箔６ｂは極めて露出部分が少なく両側より第１，第２金
属支持板６ａ，６ｃにより保護されているため、金属箔
６ｂにしわが寄ったり傷付いたりすることがなく、取扱
い性の良い安全弁６を提供することができる。また、上
記第１，第２金属支持板６ａ，６ｃの第１，第２貫通穴
６ｄ，６ｅ近傍は周囲を抵抗溶接されることにより、完
全密閉されているため、規定破壊圧力により破壊される
よう、十分精度が保証されている。Conventionally, a V-notch is formed in a metal foil to control the thickness, and the processing accuracy tends to vary. On the other hand, in this embodiment, since the breaking pressure can be adjusted only by changing the thickness of the metal foil 6b itself, the thickness of the metal foil 6b for each product can be easily controlled, and the first and second metal support plates 6b can be easily controlled.
Since the hole diameters of a and 6c can be easily made accurate by press working, the combination of these makes it possible to set the burst pressure of the safety valve 6 with high accuracy with little variation among products. In addition, the thinner the thickness of the metal foil 6b, the more difficult it is to handle. However, the metal foil 6b is made of the first and second metal supporting plates 6a, 6
c, the metal foil 6b has a very small exposed portion and is protected from both sides by the first and second metal support plates 6a, 6c, so that the metal foil 6b is wrinkled. It is possible to provide the safety valve 6 that is easy to handle without being damaged. Further, the vicinity of the first and second through holes 6d and 6e of the first and second metal support plates 6a and 6c is completely sealed by resistance welding around the periphery, so that they are destroyed by a specified burst pressure. Thus, the accuracy is sufficiently guaranteed.
【００１９】ここで、上記安全弁６の製造工程について
図５を参照して詳細に説明する。９はプレス部に装備さ
れているプレス金型であり、ワークに対して連続的にプ
レス加工が行われる順送金型が装備されている。１０は
第１長尺状金属材としての下部アルミ材であり、第２貫
通穴６ｅが所定間隔で搬送方向に沿って形成された該下
部アルミ材１０がフープ状に巻き取られた状態より、先
端側より順次繰り出されて上記プレス金型９へ図５の左
側より右側に向かってピッチ送りされる。１１は長尺状
金属箔であり、ロール状に巻き取られた金属箔が先端側
より順次繰り出されて上記プレス金型９へ前記下部アル
ミ材１０の１ピッチ搬送動作と同期取りされ、かつ該下
部アルミ材１０と交差する（直交する）ように図５の下
側より上側に向かってピッチ送りされる。１２は第２長
尺状金属材としての上部アルミ材であり、第１貫通穴６
ｄが所定間隔で搬送方向に沿って形成された該上部アル
ミ材１２がフープ状に巻き取られた状態より、先端側よ
り順次繰り出されて上記プレス金型９へ前記下部アルミ
材１０の１ピッチ搬送動作と同期取りされ、かつ該下部
アルミ材１０と交差する（直交する）ように図５の下側
より上側に向かってピッチ送りされる。１３は溶接装置
であり、前記プレス金型９を経て所定形状に打ち抜かれ
て個片となった成形品の第１，第２貫通穴６ｄ，６ｅの
近傍を必要に応じて周方向に抵抗溶接するものである。Here, the manufacturing process of the safety valve 6 will be described in detail with reference to FIG. Reference numeral 9 denotes a press die provided in the press section, which is provided with a progressive die for continuously performing press working on a work. Reference numeral 10 denotes a lower aluminum material as a first elongated metal material. The lower aluminum material 10 in which second through holes 6e are formed at predetermined intervals along the transport direction is taken from a state in which the lower aluminum material 10 is wound in a hoop shape. It is sequentially fed out from the front end side, and is pitch-fed to the press die 9 from the left side to the right side in FIG. Reference numeral 11 denotes a long metal foil, and the metal foil wound into a roll is sequentially fed out from the tip side, synchronized with the one-pitch transfer operation of the lower aluminum material 10 to the press die 9, and The pitch is fed upward from the lower side in FIG. 5 so as to intersect (orthogonalize) with the lower aluminum material 10. Reference numeral 12 denotes an upper aluminum material serving as a second elongated metal material.
The upper aluminum material 12 formed at predetermined intervals along the transport direction is fed out from the leading end side in a state where the upper aluminum material 12 is wound up in a hoop shape, and is transferred to the press die 9 by one pitch of the lower aluminum material 10. Synchronized with the transport operation, the sheet is pitch-fed upward from the lower side in FIG. 5 so as to intersect (orthogonalize) with the lower aluminum material 10. Numeral 13 denotes a welding device, which is provided with resistance welding in the circumferential direction as necessary, in the vicinity of the first and second through holes 6d and 6e of a molded product punched into a predetermined shape through the press die 9 and formed into individual pieces. Is what you do.
【００２０】次に、上記安全弁６の製造工程について詳
述すると、先ずプレス金型９内に、前工程で平板状の長
尺状アルミ材にプレス加工を施して幅方向中心部にφ
２．５ｍｍの第２貫通穴６ｅが開けられ、該第２貫通穴
６ｅの周囲に上面側に凸部６ｇが形成された下部アルミ
材１０がピッチ送りされて搬入される。この下部アルミ
材１０は、後に打ち抜き加工されて前述した第２金属支
持板６ｃに形成される。尚、上記下部アルミ材１０はフ
ープ状に巻き取られたものを繰り出して搬送している
が、短冊状に切断されたものを搬送しても良い。上記第
２貫通穴６ｅが形成された下部アルミ材１０は下流側
（図５の右側）へ搬送され、その搬送方向と直交する方
向に搬送される長尺状金属箔１１が上側に重ね合わされ
た後、その長手方向に上記下部アルミ材１０の幅分だけ
切断されて、矩形状に切断される。上記切断された長尺
状金属箔１１から、後述する打ち抜き加工を経て金属箔
６ｂが形成される。上記切断された長尺状金属箔１１
は、下部アルミ材１０の上に第２貫通穴６ｅを覆うよう
に積層されたまま下流側に搬送される。Next, the manufacturing process of the safety valve 6 will be described in detail. First, in a press die 9, a flat long aluminum material is subjected to a press working in a previous process, and φ
A 2.5 mm second through-hole 6e is opened, and a lower aluminum material 10 having a convex portion 6g formed on the upper surface side around the second through-hole 6e is pitch-fed and carried in. The lower aluminum material 10 is punched later and formed on the above-described second metal support plate 6c. Although the lower aluminum material 10 is fed out and transported in a hoop shape, it may be transported in a strip shape. The lower aluminum material 10 in which the second through-hole 6e is formed is conveyed to the downstream side (right side in FIG. 5), and the long metal foil 11 conveyed in a direction orthogonal to the conveying direction is overlapped on the upper side. Thereafter, the lower aluminum material 10 is cut in the longitudinal direction by the width of the lower aluminum material 10 and cut into a rectangular shape. The metal foil 6b is formed from the cut long metal foil 11 through a punching process described later. The cut long metal foil 11
Is transported downstream while being stacked on the lower aluminum material 10 so as to cover the second through-hole 6e.
【００２１】上記長尺状金属箔１１の上に、前工程で平
板状の長尺状アルミ材にプレス加工を施して幅方向中心
部にφ２．５ｍｍの第１貫通穴６ｄが開けられ、該第１
貫通穴６ｄの周囲に下面側に凹部６ｆが形成された上部
アルミ材１２を、前記下部アルミ材１０の搬送方向と直
交する方向にプレス金型９へ搬入する。この上部アルミ
材１２は、後に打ち抜き加工を施されて前述した第１金
属支持板６ａに形成される。尚、上記上部アルミ材１２
はフープ状に巻き取られたものを繰り出して搬送してい
るが、短冊状に切断されたものを搬送しても良い。On the long metal foil 11, a flat long aluminum material is subjected to press working in the previous step to form a first through hole 6d of φ2.5 mm at the center in the width direction. First
The upper aluminum material 12 having the recess 6 f formed on the lower surface side around the through hole 6 d is carried into the press die 9 in a direction orthogonal to the direction of transport of the lower aluminum material 10. The upper aluminum material 12 is punched later to be formed on the first metal support plate 6a described above. The upper aluminum material 12
Is fed out and transported in a hoop shape, but may be transported in a strip shape.
【００２２】上記上部アルミ材１２を上記長尺状金属箔
１１の上に重ね合わせた後、前記下部アルミ材１０、長
尺状金属箔１１及び上部アルミ材１２をそれぞれ積層し
たまま上部アルミ材１２及び下部アルミ材１０の対向面
側に形成された凹部６ｆと凸部６ｇとをかしめつつ円形
に打ち抜く。このとき、第１，第２金属支持板６ａ，６
ｃは、中心部に形成された第１，第２貫通穴６ｄ，６ｅ
が、金属箔６ｂを介して連通可能に位置決めされ、かつ
該金属箔６ｂにより密閉されて一体化される。このよう
に、薄くて取扱いが難しい長尺状金属箔１１を上部アル
ミ材１２と下部アルミ材１０との間に挟んだ３層構造で
打ち抜くため、金属箔６ｂの取扱い性が良く、しかも成
形品の表面側に金属箔６ｂが露出する部分が極めて少な
いので、しわがよったり、傷付いたりすることがない。After the upper aluminum material 12 is superimposed on the long metal foil 11, the lower aluminum material 10, the long metal foil 11 and the upper aluminum material 12 are laminated and the upper aluminum material 12 is laminated. Then, the concave portion 6f and the convex portion 6g formed on the facing surface side of the lower aluminum material 10 are punched in a circular shape while caulking. At this time, the first and second metal support plates 6a, 6
c is the first and second through holes 6d, 6e formed at the center.
Are positioned so that they can communicate with each other via the metal foil 6b, and are sealed and integrated by the metal foil 6b. Since the thin metal foil 11 which is thin and difficult to handle is punched out in a three-layer structure in which the metal foil 6b is sandwiched between the upper aluminum material 12 and the lower aluminum material 10, the handleability of the metal foil 6b is good and the molded product is good. Since the portion where the metal foil 6b is exposed on the front surface side is extremely small, there is no wrinkling or damage.
【００２３】この後、上記金属箔６ｂによる第１，第２
貫通穴６ｄ，６ｅの密閉性を確実にするため、上記プレ
ス金型９より下流側に溶接装置１３を配設して、上記第
１，第２貫通穴６ｄ，６ｅの近傍を抵抗溶接しても良
い。このとき、打ち抜いた成形品を単品として取り出
し、個々に溶接装置１３に搬入して第１，第２貫通穴６
ｄ，６ｅの周囲に溶接部６ｈを形成しても良いが、上記
打ち抜いた成形品をそのまま下部アルミ材１０にセット
したまま、下流側（図５の右側）の溶接装置１３へ搬入
して抵抗溶接を行い、溶接部６ｈを形成した後で取り出
すようにしても良い。この方が、成形品がばらばらにな
らずに次工程に搬送することができ、組立の自動化を図
る上では有利である。Thereafter, the first and second metal foils 6b are used.
In order to ensure the hermeticity of the through holes 6d and 6e, a welding device 13 is provided downstream of the press die 9, and the vicinity of the first and second through holes 6d and 6e is resistance-welded. Is also good. At this time, the punched molded product is taken out as a single product and individually carried into the welding device 13 to be inserted into the first and second through holes 6.
A welded portion 6h may be formed around d and 6e. However, the punched molded product is loaded into the welding device 13 on the downstream side (right side in FIG. 5) while being set as it is on the lower aluminum material 10 and the resistance is set. The welding may be performed and the welded portion 6h may be formed and then taken out. This is advantageous in that the molded article can be transported to the next step without falling apart, and automation of assembly can be achieved.
【００２４】上記溶接工程は、上記プレス加工における
凹凸嵌合により金属箔６ｂの密閉性が確保できれば必ず
しも必要な工程とはならない。また、上記第１，第２金
属支持板６ａ，６ｃに形成した凹部６ｆ，凸部６ｇを形
成しなくとも、上記第１，第２貫通穴６ｄ，６ｅの周囲
を溶接装置１３により抵抗溶接して密封するように構成
しても良い。The above welding step is not always necessary as long as the metal foil 6b can be hermetically sealed by fitting the unevenness in the press working. Also, the periphery of the first and second through holes 6d and 6e is resistance-welded by the welding device 13 without forming the concave portions 6f and the convex portions 6g formed in the first and second metal support plates 6a and 6c. It may be configured to be sealed.
【００２５】このように、上記安全弁６は、プレス加工
のみによって材料から完成品まで自動化された工程で仕
上げることが可能であるため、製造コストが低コストで
済み、しかも組立性が良い。また、長尺状金属箔１１を
上部アルミ材１２と下部アルミ材１０との間に介在させ
てプレス加工により打ち抜いて一体化しているため、安
全弁６の金属箔６ｂに傷やしわなどを発生させることな
く取扱い性が良い。また、上記プレス加工を施す際に上
部アルミ材１２と下部アルミ材１０を凹凸嵌合させてか
しめたり、第１，第２貫通穴６ｄ，６ｅの周囲に溶接加
工を施すことにより金属箔６ｂの密閉性を高めて、信頼
性の高い安全弁６を製造することができる。As described above, since the safety valve 6 can be completed in an automated process from material to finished product only by press working, the manufacturing cost can be reduced and the assembling property is good. Further, since the long metal foil 11 is interposed between the upper aluminum material 12 and the lower aluminum material 10 and punched and integrated by press working, scratches and wrinkles are generated on the metal foil 6b of the safety valve 6. Good handling without any problems. Further, when performing the above-described press working, the upper aluminum material 12 and the lower aluminum material 10 are crimped by engaging and recessing the upper and lower aluminum materials 10 or by welding around the first and second through holes 6d and 6e. It is possible to manufacture a highly reliable safety valve 6 with improved sealing performance.
【００２６】上記実施例は、安全弁６を３層構造にした
が、金属箔６ｂの取扱い性が改善されれば、図６に示す
ように、第１金属支持板６ａに金属箔６ｂを積層して一
体化した２層構造の安全弁１４を製造することも可能で
ある。この場合、第１金属支持板６ａの第１貫通穴６ｄ
を閉塞するように金属箔６ｂを接着することを要する。
従って、上記第１貫通穴６ｄの周辺を抵抗溶接して密閉
することを要する。上記２層構造の安全弁１４は、部品
点数を減らし、製造工程も簡略化できるので、製造コス
トを更に削減できるメリットがある。In the above embodiment, the safety valve 6 has a three-layer structure. However, if the handleability of the metal foil 6b is improved, the metal foil 6b is laminated on the first metal support plate 6a as shown in FIG. It is also possible to manufacture the safety valve 14 of a two-layer structure integrated by doing. In this case, the first through hole 6d of the first metal support plate 6a
It is necessary to adhere the metal foil 6b so as to close the metal foil 6b.
Therefore, it is necessary to seal the periphery of the first through hole 6d by resistance welding. The safety valve 14 having the two-layer structure has the advantage that the number of parts can be reduced and the manufacturing process can be simplified, so that the manufacturing cost can be further reduced.
【００２７】上記安全弁１４の製造工程としては、図４
と同様な装置構成で、予め前工程で平板状の長尺状アル
ミ材にプレス加工を施して幅方向中心部に第１貫通穴６
ｄが穿孔された該長尺状アルミ材をプレス金型９にピッ
チ送りして搬入し、長尺状金属箔１１を上記長尺状アル
ミ材の１ピッチ搬送動作と同期取りし、かつ該長尺状ア
ルミ材の搬送方向と交差（直交）する方向より上記プレ
ス金型９へ搬送して両者を一体として打ち抜いた後、こ
れらを溶接装置１３に搬送して第１貫通穴６ｄの周囲に
抵抗溶接を施して製造される。尚、上記長尺状アルミ材
はフープ状に巻き取られたものを繰り出して搬送しても
良いし、或いは短冊状に切断されたものを搬送しても良
い。The manufacturing process of the safety valve 14 is shown in FIG.
In the same device configuration as above, the plate-shaped long aluminum material is subjected to press working in the previous step, and the first through hole 6 is formed at the center in the width direction.
The long aluminum material having the hole d is fed into the press mold 9 at a pitch, and is carried in. The long metal foil 11 is synchronized with the one-pitch conveyance operation of the long aluminum material, and the length is adjusted. After being conveyed to the press die 9 in a direction intersecting (perpendicular to) the conveying direction of the long aluminum material and punching the both together, these are conveyed to the welding device 13 and resistance around the first through hole 6d is generated. Manufactured by welding. In addition, the above-mentioned long aluminum material may be fed out and transported in a hoop shape, or may be transported in a strip shape.
【００２８】また、上記実施の態様では金属箔６ｂの厚
さを２０μｍ、穴径φを２．５ｍｍとして破壊圧力を例
示したがこれに限定されるものではなく、安全弁６の寸
法は製品によって様々であるため種々に変更可能であ
り、また、安全弁６に形成される貫通穴の数も１か所に
限らず、破壊圧力を管理できる限り、複数箇所に設けら
れていても良い等、発明の精神を逸脱しない範囲内で多
くの改変を施し得るのは勿論のことである。In the above embodiment, the burst pressure is exemplified by setting the thickness of the metal foil 6b to 20 μm and the hole diameter φ to 2.5 mm. However, the present invention is not limited to this, and the dimensions of the safety valve 6 vary depending on the product. Therefore, the number of through holes formed in the safety valve 6 is not limited to one, and may be provided at a plurality of places as long as the burst pressure can be controlled. Of course, many modifications can be made without departing from the spirit.
【００２９】[0029]
【発明の効果】本発明によれば、安全弁は、第１貫通穴
を所定間隔で搬送方向に形成した第１長尺状金属材をプ
レス部へピッチ送りする第１長尺状金属材搬送工程と、
長尺状金属箔を前記第１長尺状金属材の搬送動作と同期
取りし、かつ該第１長尺状金属材と交差するように前記
プレス部へ搬送する長尺状金属箔搬送工程と、前記第１
貫通穴と連通可能な第２貫通穴を所定間隔で搬送方向に
形成した第２長尺状金属材を、前記第１長尺状金属材の
搬送動作と同期取りし、かつ該第１長尺状金属材と交差
するように前記プレス部へ搬送する第２長尺状金属材搬
送工程と、前記プレス部で第１長尺状金属材、長尺状金
属箔及び第２長尺状金属材を積層した状態で打ち抜い
て、前記長尺状金属箔により前記第１，第２貫通穴を密
閉する打ち抜き工程とを経て製造されるため、プレス加
工のみによって材料から完成品まで自動化された工程で
仕上げることが可能であるため、製造コストが低コスト
で済み、しかも組立性が良い。また、上記長尺状金属箔
を第１，第２長尺状金属材の間に介在させてプレス加工
により打ち抜いて一体化しているため、安全弁の金属箔
が表面に露出する部分が極めて少なく、しかも薄い金属
箔を単品で取り扱うことがないので、上記金属箔に傷や
しわなどを発生させることなく、取扱い性が良い。ま
た、上記プレス加工を施す際に第１，第２長尺状金属材
を凹凸嵌合させてかしめたり、第１，第２貫通穴の周囲
に溶接加工を施すことにより、上記金属箔の密閉性を高
めて、信頼性の高い安全弁を製造することができる。According to the present invention, the safety valve comprises a first elongate metal material transporting step of feeding a first elongate metal material having first through holes formed at predetermined intervals in the transport direction to a press section at a pitch. When,
An elongate metal foil conveying step of synchronizing the elongate metal foil with the conveyance operation of the first elongate metal material, and conveying the elongate metal foil to the press section so as to intersect the first elongate metal material; , The first
A second elongate metal member having a second through-hole communicating with the through-hole formed at a predetermined interval in a conveying direction, synchronized with a conveying operation of the first elongate metal member, and A second elongate metal material conveying step of conveying to the press section so as to intersect with the metal sheet, and a first elongate metal material, an elongate metal foil, and a second elongate metal material in the press section Is punched in a laminated state, and is manufactured through a punching step of sealing the first and second through-holes with the long metal foil, so that it is an automated process from material to finished product only by press working. Since it can be finished, the production cost can be reduced and the assemblability is good. In addition, since the long metal foil is interposed between the first and second long metal materials and punched and integrated by press working, the metal foil of the safety valve has very few exposed portions on the surface, Moreover, since the thin metal foil is not handled as a single item, the metal foil is easy to handle without causing scratches and wrinkles. In addition, when the press working is performed, the first and second long metal materials are crimped by fitting into and out of unevenness, or by welding around the first and second through holes to seal the metal foil. Thus, a highly reliable safety valve can be manufactured.
【図１】安全弁の正面図である。FIG. 1 is a front view of a safety valve.
【図２】図１の安全弁の上視図及び部分断面図である。2 is a top view and a partial cross-sectional view of the safety valve of FIG.
【図３】リチウムイオン電池の構成を示す部分断面図で
ある。FIG. 3 is a partial cross-sectional view illustrating a configuration of a lithium ion battery.
【図４】安全弁の破壊圧力を示すグラフ図である。FIG. 4 is a graph showing a burst pressure of a safety valve.
【図５】安全弁の製造工程を示す説明図である。FIG. 5 is an explanatory view showing a manufacturing process of the safety valve.
【図６】他例に係る安全弁の正面図である。FIG. 6 is a front view of a safety valve according to another example.
【図７】従来の安全弁の構造を示す説明図である。FIG. 7 is an explanatory view showing the structure of a conventional safety valve.
１ 電池本体 ２ 正極端子 ３ 負極端子 ４ 逃げ穴 ５ ＰＴＣ素子 ６，１４ 安全弁 ６ａ 第１金属支持板 ６ｂ アルミ箔 ６ｃ 第２金属支持板 ６ｄ 第１貫通穴 ６ｅ 第２貫通穴 ６ｆ 凹部 ６ｇ 凸部 ６ｈ 溶接部 ７ ガスケット ８ タブ ９ プレス金型 １０ 下部アルミ材 １１ 長尺状金属箔 １２ 上部アルミ材 １３ 溶接装置 DESCRIPTION OF SYMBOLS 1 Battery main body 2 Positive electrode terminal 3 Negative electrode terminal 4 Escape hole 5 PTC element 6, 14 Safety valve 6a First metal support plate 6b Aluminum foil 6c Second metal support plate 6d First through hole 6e Second through hole 6f Concave portion 6g Convex portion 6h Welded part 7 Gasket 8 Tab 9 Press mold 10 Lower aluminum material 11 Long metal foil 12 Upper aluminum material 13 Welding device
Claims (8)
密封するように配設され、電池内に異常圧が生じると弁
が破壊されて異常圧を外部に逃がすリチウムイオン電池
の安全弁の製造方法において、 貫通穴を所定間隔で搬送方向に形成した長尺状金属材を
プレス部へピッチ送りする長尺状金属材搬送工程と、 長尺状金属箔を前記長尺状金属材の搬送動作と同期取り
し、かつ該長尺状金属材と交差するように前記プレス部
へ搬送する長尺状金属箔搬送工程と、 前記プレス部で前記長尺状金属材と長尺状金属箔を積層
した状態で打ち抜いて、前記長尺状金属箔により前記貫
通穴を密閉する打ち抜き工程と、 前記貫通穴の周囲を抵抗溶接する溶接工程と、 を有することを特徴とするリチウムイオン電池の安全弁
の製造方法。1. A method of manufacturing a safety valve for a lithium ion battery, wherein the valve is disposed near a terminal of the lithium ion battery so as to seal the battery, and when an abnormal pressure is generated in the battery, the valve is broken to release the abnormal pressure to the outside. A long metal material transporting step of pitch-feeding a long metal material having through holes formed at predetermined intervals in the transport direction to a press section, and synchronizing the long metal foil with the transport operation of the long metal material. Removing and transporting the elongated metal material to the press section so as to intersect with the elongated metal material, and a state in which the elongated metal material and the elongated metal foil are laminated in the press section. A method for manufacturing a safety valve for a lithium ion battery, comprising: a punching step of sealing the through hole with the long metal foil, and a welding step of resistance welding around the through hole.
状金属材に貫通穴を所定間隔で搬送方向に穿孔する穴開
け工程を有することを特徴とする請求項１記載のリチウ
ムイオン電池の安全弁の製造方法。2. The safety valve for a lithium ion battery according to claim 1, further comprising, prior to the punching step, a drilling step of drilling through holes in the elongated metal material at predetermined intervals in a transport direction. Manufacturing method.
密封するように配設され、電池内に異常圧が生じると弁
が破壊されて異常圧を外部に逃がすリチウムイオン電池
の安全弁の製造方法において、 第１貫通穴を所定間隔で搬送方向に形成した第１長尺状
金属材をプレス部へピッチ送りする第１長尺状金属材搬
送工程と、 長尺状金属箔を前記第１長尺状金属材の搬送動作と同期
取りし、かつ該第１長尺状金属材と交差するように前記
プレス部へ搬送する長尺状金属箔搬送工程と、 前記第１貫通穴と連通可能な第２貫通穴を所定間隔で搬
送方向に形成した第２長尺状金属材を、前記第１長尺状
金属材の搬送動作と同期取りし、かつ該第１長尺状金属
材と交差するように前記プレス部へ搬送する第２長尺状
金属材搬送工程と、 前記プレス部で第１長尺状金属材、長尺状金属箔及び第
２長尺状金属材を積層した状態で打ち抜いて、前記長尺
状金属箔により前記第１，第２貫通穴を密閉する打ち抜
き工程と、 を有することを特徴とするリチウムイオン電池の安全弁
の製造方法。3. A method of manufacturing a safety valve for a lithium ion battery, wherein the valve is disposed near a terminal of the lithium ion battery so as to hermetically seal the valve, and when an abnormal pressure is generated in the battery, the valve is broken to release the abnormal pressure to the outside. A first elongate metal material conveying step of feeding a first elongate metal material having a first through-hole formed at a predetermined interval in a conveying direction to a press unit at a pitch, and feeding the elongate metal foil to the first elongate metal foil; A long metal foil conveying step of synchronizing with the conveying operation of the metal sheet and conveying the metal sheet to the press section so as to intersect with the first metal sheet; The second elongated metal material having the two through holes formed at predetermined intervals in the transport direction is synchronized with the transport operation of the first elongated metal material, and intersects with the first elongated metal material. A second elongate metal material conveying step of conveying to the press section at the press section; A punching step in which a long metal material, a long metal foil, and a second long metal material are laminated and punched, and the first and second through holes are sealed with the long metal foil; A method for manufacturing a safety valve for a lithium ion battery, comprising:
金属材搬送工程との間に、前記長尺状金属箔を所定長に
切断する切断工程を有していることを特徴とする請求項
３記載のリチウムイオン電池の安全弁の製造方法。4. A cutting step for cutting the long metal foil into a predetermined length between the long metal foil transferring step and the second long metal material transferring step. The method for manufacturing a safety valve for a lithium ion battery according to claim 3.
１，第２長尺状金属材に第１，第２貫通穴を所定間隔で
搬送方向にそれぞれ穿孔する穴開け工程と、前記第１貫
通穴及び第２貫通穴の周囲に凹部及び凸部をそれぞれ形
成する凹凸部形成工程とを有することを特徴とする請求
項３又は請求項４記載のリチウムイオン電池の安全弁の
製造方法。5. A punching step of punching first and second through holes in the first and second elongated metal members at predetermined intervals in a transport direction, respectively, prior to the punching step; 5. The method for manufacturing a safety valve for a lithium ion battery according to claim 3, further comprising a step of forming a concave and convex portion around the hole and the second through hole, respectively.
第２長尺状金属材の対向面側にそれぞれ形成された前記
凹部及び凸部で前記長尺状金属箔を噛み込むように前記
プレス部でかしめて該長尺状金属箔により前記第１，第
２貫通穴を密閉することを特徴とする請求項５記載のリ
チウムイオン電池の安全弁の製造方法。6. The method according to claim 1, wherein in the punching step,
The concave portion and the convex portion formed on the opposing surface side of the second elongated metal material are caulked by the press section so as to bite the elongated metal foil, and the first and second metal foils are used as the first and second metal foils. The method for manufacturing a safety valve for a lithium ion battery according to claim 5, wherein the second through hole is sealed.
状金属材の第１，第２貫通穴の近傍を抵抗溶接する溶接
工程を備えたことを特徴とする請求項３、４５又は請求
項６記載のリチウムイオン電池の安全弁の製造方法。7. The method according to claim 3, further comprising, after the punching step, a welding step of resistance welding the vicinity of the first and second through holes of the first and second elongated metal materials. 7. A method for manufacturing a safety valve for a lithium ion battery according to claim 6.
を特徴とする請求項１〜７のうちいずれか１項記載のリ
チウムイオン電池の安全弁の製造方法。8. The method of manufacturing a safety valve for a lithium ion battery according to claim 1, wherein an aluminum foil is used as the metal foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9087994A JPH10284033A (en) | 1997-04-07 | 1997-04-07 | Manufacture of safety valve of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9087994A JPH10284033A (en) | 1997-04-07 | 1997-04-07 | Manufacture of safety valve of lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10284033A true JPH10284033A (en) | 1998-10-23 |
Family
ID=13930366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9087994A Pending JPH10284033A (en) | 1997-04-07 | 1997-04-07 | Manufacture of safety valve of lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10284033A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000123813A (en) * | 1998-10-15 | 2000-04-28 | Toyo Kohan Co Ltd | Manufacture of safety device of sealed battery and equipment |
| JP2000182589A (en) * | 1998-12-17 | 2000-06-30 | Sanyo Electric Co Ltd | Sealed-type battery and port sealing cover thereof |
| EP1139458A3 (en) * | 2000-03-30 | 2002-06-05 | Ngk Insulators, Ltd. | Lithium secondary battery with wound electrode assembly and manufacturing method thereof |
| JP2008016746A (en) * | 2006-07-10 | 2008-01-24 | Toppan Forms Co Ltd | Paired product manufacturing apparatus and method therefor |
| JP2008123726A (en) * | 2006-11-08 | 2008-05-29 | Akira Ikeda | Safety valve of sealed battery |
| CN105328335A (en) * | 2014-08-30 | 2016-02-17 | 王月兰 | Lithium battery welding device |
-
1997
- 1997-04-07 JP JP9087994A patent/JPH10284033A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000123813A (en) * | 1998-10-15 | 2000-04-28 | Toyo Kohan Co Ltd | Manufacture of safety device of sealed battery and equipment |
| JP2000182589A (en) * | 1998-12-17 | 2000-06-30 | Sanyo Electric Co Ltd | Sealed-type battery and port sealing cover thereof |
| EP1139458A3 (en) * | 2000-03-30 | 2002-06-05 | Ngk Insulators, Ltd. | Lithium secondary battery with wound electrode assembly and manufacturing method thereof |
| US6866961B2 (en) | 2000-03-30 | 2005-03-15 | Ngk Insulators, Ltd. | Lithium secondary battery and manufacturing method thereof |
| US7147962B2 (en) | 2000-03-30 | 2006-12-12 | Ngk Insulators, Ltd. | Lithium secondary battery and manufacturing method thereof |
| JP2008016746A (en) * | 2006-07-10 | 2008-01-24 | Toppan Forms Co Ltd | Paired product manufacturing apparatus and method therefor |
| JP2008123726A (en) * | 2006-11-08 | 2008-05-29 | Akira Ikeda | Safety valve of sealed battery |
| JP4676947B2 (en) * | 2006-11-08 | 2011-04-27 | 章 池田 | Sealed battery safety valve |
| KR101164285B1 (en) | 2006-11-08 | 2012-07-09 | 선전 케다리 산업 주식회사 | Safety valve for sealed cells |
| TWI413328B (en) * | 2006-11-08 | 2013-10-21 | Shenzhen Kedali Industry Co Ltd | Closed battery safety valve |
| CN105328335A (en) * | 2014-08-30 | 2016-02-17 | 王月兰 | Lithium battery welding device |
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