JPH10284035A - Explosion proof sealing plate for sealed battery and its manufacture - Google Patents
Explosion proof sealing plate for sealed battery and its manufactureInfo
- Publication number
- JPH10284035A JPH10284035A JP9083840A JP8384097A JPH10284035A JP H10284035 A JPH10284035 A JP H10284035A JP 9083840 A JP9083840 A JP 9083840A JP 8384097 A JP8384097 A JP 8384097A JP H10284035 A JPH10284035 A JP H10284035A
- Authority
- JP
- Japan
- Prior art keywords
- metal foil
- foil valve
- explosion
- sealing plate
- lower metal
- 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.)
- Granted
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、密閉型電池、特に
リチウム二次電池などの高エネルギ密度を有する密閉型
の非水電解液電池の封口に用いられる密閉型電池用防爆
封口板およびその製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof sealing plate for a sealed battery used for sealing a sealed non-aqueous electrolyte battery having a high energy density, such as a lithium secondary battery, and particularly, to a sealed battery. It is about the method.
【０００２】[0002]
【従来の技術】近年、ＡＶ機器あるいはパソコンなどの
電子機器のポータブル化、コードレス化が急速に進んで
おり、これら携帯機器の駆動電源としては、高容量化し
た各種のアルカリ蓄電池やリチウム二次電池に代表され
る非水電解液（有機溶媒系電解液）二次電池が適してお
り、さらに、これら非水電解液二次電池は、高エネルギ
密度で負荷特性の優れた密閉型とすることが促進されて
いる。2. Description of the Related Art In recent years, portable and cordless electronic devices such as AV devices and personal computers have been rapidly advanced, and various types of high-capacity alkaline storage batteries and lithium secondary batteries have been used as driving power supplies for these portable devices. Non-aqueous electrolyte (organic solvent-based electrolyte) rechargeable batteries are suitable, and these non-aqueous electrolyte rechargeable batteries should be sealed type with high energy density and excellent load characteristics. Is promoted.
【０００３】ところで、エネルギ密度の高い密閉型の非
水電解液電池では、電池内部で発生するガスを対極で消
費する、所謂ノイマン方式を採用できないため、過充電
や過放電を避ける必要がある。ところが、充電器を含む
機器の故障や過充電あるいは誤使用などが生じた場合に
は、電池内部の発電要素が化学反応を起こし、例えば、
過充電や短絡などによる異常反応により電解液や活物質
が分解し、それに伴って電池内部に異常にガスが発生
し、電池内圧が過大となる。このような問題の発生を未
然に確実に防止するために、この種の電池には、電池内
圧が設定値を超えたときに弁体を開いてガスを排出する
防爆安全装置が従来から付加されている。[0003] Incidentally, in a sealed nonaqueous electrolyte battery having a high energy density, a so-called Neumann system in which gas generated inside the battery is consumed at the opposite electrode cannot be adopted, so that overcharge and overdischarge must be avoided. However, in the case of failure, overcharging, or misuse of equipment including the charger, the power generation element inside the battery causes a chemical reaction, for example,
The electrolyte and the active material are decomposed by an abnormal reaction due to overcharging, short-circuit, or the like, and accordingly, abnormal gas is generated inside the battery, and the internal pressure of the battery becomes excessive. In order to reliably prevent such problems from occurring, explosion-proof safety devices that open the valve and discharge gas when the battery internal pressure exceeds a set value have been added to this type of battery. ing.
【０００４】さらに、非水電解液二次電池では、過充電
状態となった場合に充電電流が流れ続けるため、電解液
や活物質が分解し続けて急激に温度上昇するおそれもあ
る。そこで、この種の電池には、電池内圧が所定値に上
昇したのを検知することにより、ガスの排出に先立って
通電電流を完全に遮断する確実な防爆安全機構が設けら
れている。Further, in a non-aqueous electrolyte secondary battery, since a charging current continues to flow when the battery is overcharged, the electrolyte and the active material may continue to decompose and the temperature may rise rapidly. Therefore, this type of battery is provided with a reliable explosion-proof safety mechanism that completely shuts off the current before discharging gas by detecting that the internal pressure of the battery has risen to a predetermined value.
【０００５】このような防爆安全機構としては、例えば
図８に示す構成のものが知られている（特開平6-215747
号公報参照）。この防爆安全機構は、上部の弁体１と通
気孔３を有する端子板２とが各々の周縁部の間に絶縁ガ
スケット１０を介在して積み重ねられ、弁体１と端子板
２とは、各々の中央部の溶着部４を通じてのみ導電状態
になっている。通常時には、通電電流が極板（図示せ
ず）、リード体（図示せず）、金属ケース７および端子
板２から溶着部４を介して弁体１、ＰＴＣ素子８および
金属キャップ９に流れ、電池として機能する。そして、
電池内圧が所定値まで上昇した場合には、この電池内圧
を金属ケース７の通気孔５および端子板２の通気孔３を
通じて受ける弁体１が内圧作用方向（図の上方）へ変形
する応力によって、弁体１が端子板２の溶着部４から剥
離し、通電電流を遮断する。[0005] As such an explosion-proof safety mechanism, for example, the one shown in FIG.
Reference). In this explosion-proof safety mechanism, an upper valve body 1 and a terminal plate 2 having a vent hole 3 are stacked with an insulating gasket 10 interposed between respective peripheral portions, and the valve body 1 and the terminal plate 2 Is in a conductive state only through the welded portion 4 at the central portion of. Normally, a current flows from the electrode plate (not shown), the lead body (not shown), the metal case 7 and the terminal plate 2 to the valve body 1, the PTC element 8 and the metal cap 9 via the welding portion 4, Functions as a battery. And
When the internal pressure of the battery rises to a predetermined value, the valve body 1 which receives the internal pressure of the battery through the air hole 5 of the metal case 7 and the air hole 3 of the terminal plate 2 is deformed in the internal pressure acting direction (upward in the figure) by the stress. Then, the valve element 1 peels off from the welded portion 4 of the terminal plate 2 and cuts off the current.
【０００６】ところで、上記の防爆安全機構では、溶着
部４の形成に際して、弁体１と端子板２との所定部位同
士を一定の電池内圧によって剥離可能な低い溶着強度に
溶接する必要があるため、そのような低い溶着強度に溶
接が可能な超音波溶接が採用されていた。しかしなが
ら、超音波溶接は、振動発熱により被溶接物の接合部の
表面にのみ溶解を起こさせて被溶接物同士を溶接するも
のであって、不安定要素が多いことから溶着強度にどう
してもばらつきが生じる。これに対し上記の防爆安全機
構では、この溶着強度によって電流を遮断するための電
流遮断圧力を設定しているので、電流遮断圧力は、溶着
強度のばらつきに応じて相違し、一定値に設定できない
欠点がある。それにより、電池内圧が所定値に達する以
前に電流が遮断されてしまったり、逆に、電池内圧が所
定値に達しているにも拘わらず電流が遮断されないなど
の不都合が生じることになる。By the way, in the above explosion-proof safety mechanism, when forming the welded portion 4, it is necessary to weld predetermined portions of the valve body 1 and the terminal plate 2 to a low welding strength which can be peeled off by a constant internal pressure of the battery. Ultrasonic welding capable of welding with such low welding strength has been adopted. However, ultrasonic welding involves welding only the surfaces of the joints of the objects to be welded by vibrating heat, so that the objects to be welded are welded to each other. Occurs. On the other hand, in the above explosion-proof safety mechanism, since the current cutoff pressure for interrupting the current is set by the welding strength, the current cutoff pressure differs depending on the variation of the welding strength and cannot be set to a constant value. There are drawbacks. As a result, inconveniences may occur such that the current is interrupted before the battery internal pressure reaches the predetermined value, or conversely, the current is not interrupted even though the battery internal pressure has reached the predetermined value.
【０００７】そこで、図９に示すような密閉型電池用防
爆封口板が提案されている。この密閉型電池用防爆封口
板は、電池内圧の上昇によって電流を遮断する際に、溶
着強度の影響を受けることのないものである。すなわ
ち、この防爆封口板は、上部金属箔弁体１１と下部金属
箔弁体１２とにより防爆弁機構が構成されており、その
他の構成は図８のものと同様である。上部金属箔弁体１
１には、中央部に平面視Ｃ字形状の薄肉部からなる上部
易破断部１３が形成され、下部金属箔弁体１２には、上
部易破断部１３よりも径の小さい平面視円形の薄肉部か
らなる下部易破断部１４が中央部に形成されている。こ
の両金属箔弁体１１，１２は、各々の易破断部１３，１
４が同心状に対向する相対位置で各々の中央部が互いに
溶接されて、溶着部１５が形成されている。ここで、下
部易破断部１４は上部易破断部１３に対し破断強度を低
く設定されている。Therefore, an explosion-proof sealing plate for a sealed battery as shown in FIG. 9 has been proposed. This explosion-proof sealing plate for a sealed battery is not affected by the welding strength when the current is interrupted by an increase in the battery internal pressure. That is, in this explosion-proof sealing plate, an explosion-proof valve mechanism is constituted by an upper metal foil valve element 11 and a lower metal foil valve element 12, and other configurations are the same as those in FIG. Upper metal foil valve element 1
In FIG. 1, an upper easily breakable portion 13 formed of a thin portion having a C-shape in plan view is formed at the center portion, and the lower metal foil valve body 12 has a thin circular shape in plan view smaller in diameter than the upper easily breakable portion 13. The lower easily breakable portion 14 is formed at the center. The two metal foil valve elements 11 and 12 have respective easily breakable portions 13 and 1.
The central portions are welded to each other at relative positions where 4 concentrically oppose each other to form a welded portion 15. Here, the lower breakable portion 14 is set to have a lower breaking strength than the upper breakable portion 13.
【０００８】上記防爆封口板は、両金属箔弁体１１，１
２の中央部の溶着部１５のみを介して電気的に接続され
ており、電流遮断圧力は、刻印手段で形成された下部易
破断部１４の破断強度によって設定されているため、溶
着部１５の溶着強度のばらつきの影響を受けない。すな
わち、電池内圧が所定値まで上昇したときに、円形の下
部易破断部１４の全体が破断されて、下部金属箔弁体１
２における下部易破断部１４の内方部位がくり抜かれて
上部金属箔弁体１１と一体に下部金属箔弁体１２から離
間し、通電電流が遮断される。電池内圧がさらに上昇し
た場合には、上部易破断部１３が破断して開口し、ガス
を外部に排出する。この防爆封口板では溶着部１５を剥
離させる必要がないから、溶着部１５を強固な溶着強度
に溶接が可能なレーザー溶接によって形成できる。した
がって、電流遮断圧力は、刻印手段などで形成される下
部易破断部１４の破断強度によって設定されるから、溶
着強度のばらつきの影響を全く受けない。[0008] The explosion-proof sealing plate is composed of both metal foil valve elements 11,1.
2 are electrically connected only through the welded portion 15 at the center, and the current interrupting pressure is set by the breaking strength of the lower easily breakable portion 14 formed by the marking means. Not affected by variations in welding strength. That is, when the internal pressure of the battery rises to a predetermined value, the entire lower circular easily breakable portion 14 is broken and the lower metal foil valve element 1
2, the inner portion of the lower rupturable portion 14 is hollowed out, is separated from the lower metal foil valve element 12 integrally with the upper metal foil valve element 11, and the current is interrupted. When the internal pressure of the battery further increases, the upper easily breakable portion 13 breaks and opens to discharge the gas to the outside. In this explosion-proof sealing plate, it is not necessary to peel off the welded portion 15, so that the welded portion 15 can be formed by laser welding capable of welding to a strong welding strength. Therefore, the current breaking pressure is set by the breaking strength of the lower frangible portion 14 formed by the marking means or the like, and is not affected by the variation in welding strength at all.
【０００９】[0009]
【発明が解決しようとする課題】上記防爆封口板は、上
述のように顕著な防爆安全機能を発揮するものである
が、以下のような問題が残存している。すなわち、下部
易破断部１４は溶着部１５を囲む円形状であって全体の
長さが比較的長く、電流遮断圧力は、上述の長い下部易
破断部１４の厚みの全体の和による破断強度により設定
される。そのため、下部易破断部１４は、全体にわたり
μｍオーダーの極めて薄く、且つ均一な厚みに正確に管
理して形成する必要があるから、量産性に欠ける。しか
も、下部易破断部１４は、刻印手段を高精度に制御する
加工を施したとしても、極めて薄い厚みに形成すること
から、どうしても厚みにばらつきが生じる。また、円形
の下部易破断部１４は、その全体に対し均等に破断圧力
が作用するから、破断され始める部位が特定されず、破
断動作が不安定になり易い。したがって、電流遮断圧力
は、以上の不安点要因により信頼性の低いものになりが
ちである。Although the explosion-proof sealing plate exhibits a remarkable explosion-proof safety function as described above, the following problems remain. That is, the lower breakable portion 14 has a circular shape surrounding the welded portion 15 and has a relatively long overall length, and the current interrupting pressure is determined by the breaking strength due to the total sum of the thickness of the long lower breakable portion 14 described above. Is set. For this reason, the lower easily breakable portion 14 needs to be formed in a very thin and uniform thickness of the order of μm over the entirety and accurately controlled, and thus lacks mass productivity. Moreover, even if the lower easily breakable portion 14 is processed to control the marking means with high precision, the thickness is inevitably varied since it is formed to be extremely thin. In addition, since the breaking pressure is uniformly applied to the entire lower easy breaking portion 14 having a circular shape, a portion where the breaking is started is not specified, and the breaking operation is likely to be unstable. Therefore, the current interruption pressure tends to be low in reliability due to the above-mentioned factors of anxiety.
【００１０】そこで本発明は、上述の問題点を解消し、
所定の電池内圧で破断させる易破断部を、量産性に優れ
た製作手段により所定の破断強度に正確に形成でき、信
頼性の高い電流遮断機能を得られる密閉型電池用防爆封
口板およびその製造方法を提供することを目的とするも
のである。Therefore, the present invention solves the above-mentioned problems,
An explosion-proof sealing plate for a sealed battery capable of accurately forming an easily breakable portion to be broken at a predetermined battery internal pressure to a predetermined breaking strength by a manufacturing method excellent in mass productivity and obtaining a highly reliable current interrupting function and its manufacture It is intended to provide a method.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、発電要素を収納した電池ケースの開口部
を密閉するとともに、電池内圧が設定値まで上昇したと
きに一部が破断して通電電流を遮断する密閉型電池用防
爆封口板において、導電性を有する上部および下部の両
金属箔弁体が、それらの周縁部間に絶縁ガスケットを介
在して重ね合わされ、且つ各々の中央部位を互いに溶着
した接続部のみを介して電気的に導通され、前記両金属
箔弁体が、前記上部金属箔弁体の上部に金属キャップを
配置して金属ケース内に挿入されてなり、前記下部金属
箔弁体は、前記接続部を囲むように設けられた分離線部
と、前記分離線部の両端部に連設されて相対向し、電池
内圧を前記上部金属箔弁体に作用させる一対の通気孔
と、前記両通気孔の相対向する各々の孔縁部間の部分に
より形成され、電池内圧が所定値に達した時に破断する
易破断部とを備え、電池内圧が所定値に達したときに、
前記上部金属箔弁体の上方への変形による応力を受けて
前記易破断部が破断することにより、前記分離線部、前
記両通気孔および前記易破断部で囲まれる部分が前記上
部金属箔弁体と共に分離するように構成されている。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention seals an opening of a battery case accommodating a power generating element and breaks a part when the internal pressure of the battery rises to a set value. In the sealed battery explosion-proof sealing plate for interrupting the conduction current, the upper and lower metal foil valve bodies having conductivity are overlapped with an insulating gasket interposed between their peripheral portions, and each of them has a center. The parts are electrically conducted only through the welded connection part, and the two metal foil valve elements are inserted into a metal case with a metal cap disposed on the upper metal foil valve element, The lower metal foil valve element is provided at both ends of the separation line section surrounding the connection section, and is opposed to each other so as to oppose each other, and causes a battery internal pressure to act on the upper metal foil valve element. A pair of vents and the two vents Is formed by a portion between the hole edge portion of each opposed, and a frangible portion breaking when the battery internal pressure reaches a predetermined value, when the battery internal pressure reaches a predetermined value,
The upper metal foil valve body receives the stress caused by the upward deformation of the upper metal foil valve, and the easily breakable portion breaks, so that the part surrounded by the separation line portion, the two ventilation holes, and the easy breakable portion becomes the upper metal foil valve. It is configured to separate with the body.
【００１２】上記密閉型電池用防爆封口板は、電池内圧
が下部金属箔弁体の易破断部の破断強度によって設定さ
れた所定値まで上昇すると、この圧力を下部金属箔弁体
の通気孔を通じて受ける上部金属箔弁体が上方へ向け凸
状に変形し、それによって下部金属箔弁体の易破断部に
剪断力が作用して、易破断部が破断する。それにより、
下部金属箔弁体における分離線部、両通気孔および易破
断部で囲まれた部分は、接続部により上部金属箔弁体と
共に下部金属箔弁体から離れるため、接続部を通じての
み導通していた両金属箔弁体が離間して通電電流が遮断
される。When the internal pressure of the battery rises to a predetermined value set by the breaking strength of the easily breakable portion of the lower metal foil valve, the pressure increases through the ventilation hole of the lower metal foil valve. The received upper metal foil valve element is deformed in a convex shape upward, whereby a shear force acts on the easily breakable portion of the lower metal foil valve element, and the easily breakable section is broken. Thereby,
The part of the lower metal foil valve body surrounded by the separation line portion, both air holes, and the easily breakable part was separated from the lower metal foil valve body together with the upper metal foil valve body by the connection part, and thus was conductive only through the connection part. The two metal foil valve elements are separated from each other, and the current is cut off.
【００１３】この密閉型電池用防爆封口板では、易破断
部の破断強度が一対の通気孔の各々の孔縁部間を結ぶ直
線の長さにより設定されており、上記直線の長さは、従
来の防爆封口板の円形の易破断部に比較して格段に短
い。したがって、易破断部は、従来の易破断部と同一の
破断強度に設定する場合に長さが格段に短くなった分だ
け厚くすることができ、下部金属箔弁体の全体厚みを一
定にすることは容易であるから、易破断部は、一対の通
気孔の間隔のみの管理により所定の破断強度に正確に設
定でき、この一対の通気孔は打ち抜き加工により正確な
間隔に製作できる。この防爆封口板は、従来の高精度な
制御を必要とする刻印加工を用いないことから量産性に
優れているとともに、易破断部を設定した破断強度に正
確に形成できることから、電流遮断圧力にばらつきが生
じない。In this explosion-proof sealing plate for a sealed battery, the breaking strength of the easily breakable portion is set by the length of a straight line connecting between the edge portions of the pair of ventilation holes. It is much shorter than the conventional easy-to-break portion of the explosion-proof sealing plate. Therefore, the easily rupturable portion can be made thicker by a much shorter length when the same rupture strength as the conventional easily rupture portion is set, and the entire thickness of the lower metal foil valve body is made constant. Since it is easy to do so, the easily breakable portion can be accurately set to a predetermined breaking strength by managing only the interval between the pair of air holes, and the pair of air holes can be manufactured at an accurate interval by punching. This explosion-proof sealing plate is excellent in mass productivity because it does not use the conventional engraving process that requires high-precision control, and because it can accurately form an easy-to-break portion with the set breaking strength, it can reduce the current interruption pressure. No variation occurs.
【００１４】前記発明において、上部および下部の両金
属箔弁体の接続部を、両通気孔の各々の孔縁部間を結ぶ
直線の中点に対し、前記直線に平行な線上において何れ
かの方向にずれた位置に形成することが好ましい。In the above invention, the connecting portion between the upper and lower metal foil valve bodies may be positioned on any line parallel to the straight line with respect to the midpoint of the straight line connecting the edge portions of the two ventilation holes. It is preferable to form it at a position shifted in the direction.
【００１５】これにより、易破断部は、その全体が水平
に引っ張り上げらるのではなく、易破断部の中点からず
れた位置に形成された接続部により斜め方向に引き裂く
状態に破断されることになり、所定の電池内圧に達した
時点で円滑且つ安定に破断される。As a result, the easily breakable portion is not pulled up horizontally as a whole, but is broken in a state where it is torn in an oblique direction by the connecting portion formed at a position shifted from the middle point of the easily breakable portion. That is, when the internal pressure of the battery reaches a predetermined value, the battery is broken smoothly and stably.
【００１６】前記発明において、易破断部に対する外周
側近傍位置に、下部金属箔弁体を金属ケースに局部的に
固定する固定部を設けることが好ましい。In the above invention, it is preferable to provide a fixing portion for locally fixing the lower metal foil valve body to the metal case at a position near the outer peripheral side with respect to the easily breakable portion.
【００１７】これにより、下部金属箔弁体が接続部を介
して上部金属箔弁体により引っ張り上げられるときに、
下部金属箔弁体における易破断部の外周側近傍箇所は固
定部を介して金属ケースにより引っ張り上げられないよ
うに保持されるから、易破断部は、下部金属箔弁体の展
性や絶縁ガスケットの変形による影響を受けて破断強度
がばらつくといったことが生じない。そのため、この防
爆封口板は、易破断部を一対の通気孔の間隔のみにより
所定の破断強度に正確に設定できることと併せて、電流
遮断圧力に高い信頼性を得られる。Accordingly, when the lower metal foil valve element is pulled up by the upper metal foil valve element via the connection portion,
The portion of the lower metal foil valve body near the outer periphery of the easily breakable portion is held so as not to be pulled up by the metal case via the fixing portion, so the easily breakable portion is formed by the lower metal foil valve body and the insulating gasket. Does not vary due to the influence of the deformation. For this reason, the explosion-proof sealing plate can accurately set the easily breakable portion to a predetermined breaking strength only by the interval between the pair of ventilation holes, and obtain high reliability in the current interruption pressure.
【００１８】前記発明において、固定部を、分離線部、
両通気孔および易破断部を結ぶ環状の中心点と、前記両
通気孔の各々の孔縁部間を結ぶ直線の中点とを通る線上
に、前記固定部の中心点を設定して形成することが好ま
しい。In the above invention, the fixing portion may include a separation line portion,
The center point of the fixing portion is set and formed on a line passing through an annular center point connecting both the vents and the easily breakable portion and a midpoint of a straight line connecting the edge portions of the respective vents. Is preferred.
【００１９】これにより、固定部は、易破断部の中点に
対応して形成されることから、易破断部の全体にわたり
均等な保持力を安定に作用させることができる。Thus, the fixing portion is formed corresponding to the midpoint of the easily breakable portion, so that a uniform holding force can be applied stably over the entire easily breakable portion.
【００２０】前記発明において、固定部を、下部金属箔
弁体と金属ケースとの所定の対面部位を互いに溶接した
溶着部により構成することができる。In the above invention, the fixing portion may be constituted by a welded portion in which predetermined facing portions of the lower metal foil valve element and the metal case are welded to each other.
【００２１】これにより、下部金属箔弁体が接続部を介
して上部金属箔弁体により引っ張り上げられるときに、
下部金属箔弁体における易破断部に対し外周側近傍部位
を、金属ケースにより引き上げられないように確実に保
持できる。Accordingly, when the lower metal foil valve element is pulled up by the upper metal foil valve element via the connection portion,
The portion near the outer periphery with respect to the easily breakable portion of the lower metal foil valve body can be securely held so as not to be pulled up by the metal case.
【００２２】前記発明において、固定部を、金属ケース
または絶縁ガスケットに設けた凸部によって下部金属箔
弁体が局部的に強く金属ケースに圧接される構成とする
こともできる。In the above invention, the fixing portion may be configured so that the lower metal foil valve element is locally strongly pressed against the metal case by a projection provided on the metal case or the insulating gasket.
【００２３】これにより、下部金属箔弁体が接続部を介
して上部金属箔弁体により引っ張り上げられるときに、
下部金属箔弁体における易破断部に対し外周側近傍部位
を、絶縁ガスケットと金属ケースとにより局部的に強く
挟み付けて引き上げられないように確実に保持できる。Accordingly, when the lower metal foil valve element is pulled up by the upper metal foil valve element via the connection portion,
A portion near the outer periphery with respect to the easily breakable portion of the lower metal foil valve element can be securely pinched locally by the insulating gasket and the metal case so as not to be lifted up.
【００２４】前記発明において、下部金属箔弁体の一対
の通気孔を、多角形状に形成するとともに、共に同一形
状のものを対称配置に形成することが好ましい。In the above invention, it is preferable that the pair of ventilation holes of the lower metal foil valve body are formed in a polygonal shape, and that the same shape is formed symmetrically.
【００２５】これにより、一対の通気孔を、その多角形
状の角部を相対向させて形成するようにすれば、両通気
孔の間隔を所定値に正確に形成できるとともに、易破断
部の破断部位を、両通気孔の各々の角部を結ぶ直線上に
ほぼ規定でき、易破断部を所定の破断強度に容易にかつ
正確に形成することができる。By forming the pair of ventilation holes so that the polygonal corners are opposed to each other, the interval between the ventilation holes can be accurately formed to a predetermined value, and the breakage of the easily breakable portion can be achieved. The portion can be substantially defined on a straight line connecting the respective corners of both ventilation holes, and the easily breakable portion can be easily and accurately formed with a predetermined breaking strength.
【００２６】前記発明において、下部金属箔弁体の分離
線部を、Ｃ字形状のスリットとして、その両端部を一対
の通気孔にそれぞれ連通するよう形成することができ
る。In the above invention, the separation line portion of the lower metal foil valve body may be formed as a C-shaped slit so that both ends thereof communicate with a pair of ventilation holes, respectively.
【００２７】これにより、分離線部を打ち抜き加工など
の量産性に優れた加工により容易に形成できるととも
に、下部金属箔弁体における接続部を囲む環状部分は、
易破断部のみを介在して下部金属箔弁体の本体部分に接
続された状態となり、電流遮断圧力は、易破断部の長さ
と厚みとで決定する破断強度のみにより設定できるか
ら、正確に設定できる。Thus, the separation line portion can be easily formed by a process excellent in mass productivity such as a punching process, and the annular portion surrounding the connection portion in the lower metal foil valve element is formed as follows.
It is connected to the main body of the lower metal foil valve body with only the easily breakable part interposed, and the current interrupting pressure can be set only by the breaking strength determined by the length and thickness of the easily breakable part, so it is set accurately it can.
【００２８】前記発明において、下部金属箔弁体の易破
断部を、前記一対の通気孔の各々の孔縁部間を結ぶ直線
が、前記下部金属箔弁体を製造する際の圧延ロールによ
る筋目方向に合致するように形成することが好ましい。In the above invention, a straight line connecting the easily breakable portion of the lower metal foil valve element and the edge of each of the pair of ventilation holes is formed by a roll formed by a roll when manufacturing the lower metal foil valve element. Preferably, it is formed so as to match the direction.
【００２９】これにより、易破断部を常に安定に破断さ
せることができる。Thus, the easily breakable portion can always be stably broken.
【００３０】前記発明において、下部金属箔弁体の易破
断部に、一対の通気孔の孔縁部間を結ぶ直線に沿って形
成したミシン目または細い溝からなる破断規定線を設け
ることができる。[0030] In the above invention, a breakage defining line formed of a perforation or a narrow groove formed along a straight line connecting the edge portions of the pair of ventilation holes can be provided in the easily breakable portion of the lower metal foil valve body. .
【００３１】これにより、易破断部は、破断規定線部に
より破断部位を確実に規定されるから、破断動作を安定
に且つ円滑に行わせることができ、電流遮断圧力を一層
確実に所定値に設定することができる。In this way, since the rupture portion of the easy rupture portion is reliably defined by the rupture defining line portion, the rupture operation can be performed stably and smoothly, and the current interruption pressure can be more reliably set to the predetermined value. Can be set.
【００３２】前記発明において、上部金属箔弁体に、中
央部分が下方へ向け膨出した凹状部が設けられ、下部金
属箔弁体に、中央部分が上方へ向け膨出し、その膨出部
分の外周に沿って分離線部、一対の通気孔および易破断
部が環状に配して形成された凸状部が設けられ、前記両
金属箔弁体が、前記凹状部と前記凸状部との接触部位を
溶接により互いに溶着した接続部を介して電気的導通状
態に連結された構成とすることができる。In the above invention, the upper metal foil valve body is provided with a concave portion whose central portion swells downward, and the lower metal foil valve body has a central portion bulging upward and the bulging portion is formed. A separating line portion, a pair of ventilation holes and a protruding portion formed by arranging a pair of easily breakable portions in an annular shape are provided along the outer periphery, and the two metal foil valve elements are formed of the concave portion and the protruding portion. A configuration in which the contact portions are electrically connected to each other through connection portions welded to each other by welding can be employed.
【００３３】これにより、両金属箔弁体間に溶接により
接続部を形成する場合、両金属箔弁体の凹状部および凸
状部は保持手段を用いることなく各々の先端部同士を密
着状態に保持することができるため、溶接不良や穿孔が
生じることがなく、強固な接続部を歩留りよく形成する
ことができる。Thus, when a connection portion is formed between the two metal foil valve elements by welding, the concave and convex portions of the two metal foil valve elements are brought into close contact with each other without using holding means. Since it can be held, there is no occurrence of poor welding or perforation, and a strong connection can be formed with good yield.
【００３４】本発明の密閉型電池用防爆封口板の製造方
法は、下部金属箔弁体と金属ケースとの所定の対面部位
を互いに溶接した溶着部からなる固定部を有する密閉型
電池用防爆封口板の製造に際して、中央部分が上方へ向
け膨出した凸状部を有する下部金属箔弁体を金属ケース
内に挿入して、前記下部金属箔弁体における周縁部の所
定部位と金属ケースの対面部位とをレーザー溶接により
相互に溶着して固定部を形成する工程と、中央部分が下
方へ向け膨出した凹状部を有する上部金属箔弁体を前記
金属ケース内に挿入して、前記両金属箔弁体の各々の周
縁部分を絶縁ガスケットを介在して重ね合わせ、前記凹
状部と前記凸状部との各々の先端部位を互いに接触させ
る工程と、前記両金属箔弁体における各々の周縁部分を
固定治具により上下から挟み付けて固定する工程と、前
記凹状部と前記凸状部との互いに接触する部位をレーザ
ー溶接により相互に溶着して接続部を形成する工程と、
を有している。The method for manufacturing an explosion-proof sealing plate for a sealed battery according to the present invention is directed to an explosion-proof sealing plug for a sealed battery having a fixed portion comprising a welded portion in which predetermined facing portions of a lower metal foil valve element and a metal case are welded to each other. In manufacturing the plate, a lower metal foil valve body having a convex portion whose central portion bulges upward is inserted into a metal case, and a predetermined portion of a peripheral portion of the lower metal foil valve body faces the metal case. Forming a fixed portion by welding the parts to each other by laser welding, and inserting an upper metal foil valve body having a concave portion whose central portion swells downward into the metal case, Superposing the respective peripheral portions of the foil valve element with an insulating gasket interposed therebetween, and bringing the respective tip portions of the concave portion and the convex portion into contact with each other; Up with the fixing jig A step of fixing sandwiched from forming a connection portion welded to each other by laser welding a portion in contact with each other between said concave portion and the convex portion,
have.
【００３５】上記密閉型電池用防爆封口板の製造方法で
は、固定部の形成に際して、互いの溶接すべき箇所であ
る金属ケースと下部金属箔弁体の周縁部分とは、共に平
坦面であって直接的に押圧しなくても隙間なく密着する
から、支障なくレーザー溶接できる。また、レーザー溶
接により接続部を形成するに際して、両金属箔弁体の各
々の凹状部および凸状部の各々の先端部位は隙間のない
状態に密着するから、溶接不良や穿孔が生じることがな
く、強固な接続部を歩留りよく形成することができる。In the method of manufacturing the explosion-proof sealing plate for a sealed battery according to the present invention, the metal case and the peripheral portion of the lower metal foil valve, which are parts to be welded to each other, are flat when forming the fixing portion. Even without direct pressing, it can be tightly adhered without gaps, so laser welding can be performed without any trouble. Further, when forming the connection portion by laser welding, the respective leading end portions of the concave portion and the convex portion of both metal foil valve elements are in close contact with no gap, so that poor welding and drilling do not occur. A strong connection can be formed with good yield.
【００３６】[0036]
【発明の実施の形態】以下、本発明の好ましい実施の形
態について図面を参照しながら説明する。図１（ａ）は
本発明の第１の実施の形態に係る密閉型電池用防爆封口
板を示す縦断面図、同図（ｂ）はこの防爆封口板におけ
る下部金属箔弁体１８の平面図である。同図において、
この密閉型電池用防爆封口板は、可撓性を有する薄い上
部金属箔弁体１７と、この上部金属箔弁体１７に対設さ
れた可撓性を有する薄い下部金属箔弁体１８と、両金属
箔弁体１７，１８の各々の周縁部分の間に介在されたリ
ング状の絶縁ガスケット１９と、上部金属箔弁体１８の
周縁部の上面に重ね合わされたリング状のＰＴＣ（Posi
tive Temperature Coefficient）素子２０と、このＰＴ
Ｃ素子２０上に載置された複数の排気孔２１ａを有する
金属キャップ２１と、上記の各部材を積層状態で挿入さ
せて保持する複数の通気孔２２ａを有するアルミニウム
製の金属ケース２２とを備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a longitudinal sectional view showing an explosion-proof sealing plate for a sealed battery according to a first embodiment of the present invention, and FIG. 1B is a plan view of a lower metal foil valve element 18 in the explosion-proof sealing plate. It is. In the figure,
This sealed battery explosion-proof sealing plate has a flexible thin upper metal foil valve 17, a flexible thin lower metal foil valve 18 opposed to the upper metal foil valve 17, A ring-shaped insulating gasket 19 interposed between the respective peripheral portions of the metal foil valve elements 17 and 18 and a ring-shaped PTC (Posi-type) superposed on the upper surface of the peripheral portion of the upper metal foil valve element 18.
tive Temperature Coefficient) element 20 and this PT
A metal cap 21 having a plurality of exhaust holes 21a placed on the C element 20 and an aluminum metal case 22 having a plurality of ventilation holes 22a for inserting and holding the above members in a stacked state are provided. ing.
【００３７】上部金属箔弁体１７は、例えば厚さ0.10ｍ
ｍで外径が12.7ｍｍの可撓性を有するアルミニウム円板
からなり、中央部が下方に向け湾曲形状に膨出した凹状
部２３と、この凹状部２３の周囲にＣ字形状の刻印を用
いて形成された易破断性の薄肉部２４とを有している。
一方、下部金属箔弁体１８は、例えば厚さ0.10ｍｍで外
径が13.5ｍｍの可撓性を有するアルミニウム円板からな
り、その中央部分が上方に向け膨出した凸状部２７を有
している。両金属箔弁体１７，１８は、（ｂ）に示す両
金属箔弁体１７，１８の各々の中心点Ｓよりずれた部位
を局部的にレーザー溶接することにより互いに溶着され
てなる接続部２８のみを介して電気的導通状態に接続さ
れている。The upper metal foil valve element 17 is, for example, 0.10 m thick.
m, made of a flexible aluminum disk having an outer diameter of 12.7 mm and having a concave portion 23 whose central portion bulges downward in a curved shape, and a C-shaped engraving around the concave portion 23. And an easily rupturable thin portion 24 formed.
On the other hand, the lower metal foil valve element 18 is made of, for example, a flexible aluminum disk having a thickness of 0.10 mm and an outer diameter of 13.5 mm, and has a convex portion 27 whose central portion bulges upward. ing. The two metal foil valve elements 17 and 18 are welded to each other by locally laser-welding a portion of each of the metal foil valve elements 17 and 18 that is shifted from the center point S of the two metal foil valve elements 17 and 18 shown in FIG. It is connected to the electrical conduction state only through the connection.
【００３８】下部金属箔弁体１８には、（ｂ）に明示す
るように、接続部２８を囲むように設けられた平面視Ｃ
字形状のスリットからなる分離線部２９と、この分離線
部２９の両端部にそれぞれ連設されて相対向する三角形
状の一対の通気孔３０Ａ，３０Ａと、この両通気孔３０
Ａ，３０Ａの相対向する残存部分からなる易破断部３１
とを備えている。また、下部金属箔弁体１８は、易破断
部３１に対し接続部２８とは反対側の近傍部位が金属ケ
ース２２にレーザー溶接されて、固定部３２が形成され
ている。As shown in (b), the lower metal foil valve element 18 is provided with a C
A separation line portion 29 formed of a U-shaped slit; a pair of triangular ventilation holes 30A, 30A which are respectively provided at both ends of the separation line portion 29 so as to face each other;
A easily breakable portion 31 composed of the remaining portions of A and 30A facing each other
And Further, the lower metal foil valve element 18 has a fixed portion 32 formed by laser-welding a portion near the easy breakable portion 31 opposite to the connecting portion 28 to the metal case 22.
【００３９】一対の通気孔３０Ａ，３０Ａは、同一の三
角形状であって、各々の角部を相対向させて対称配置に
形成されている。易破断部３１は、一対の通気孔３０
Ａ，３０Ａの各々の三角形状の角部が相対向されている
ことにより、（ｂ）に破線で図示するように破断部位が
ほぼ規定されており、その破断部位の長さＬおよび厚み
により電池内圧を受けたときの破断強度が設定されてい
る。さらに、易破断部３１は、一対の通気孔３０Ａ，３
０Ａの各々の孔縁部間を結ぶ（ｂ）に破線で示す直線
が、下部金属箔弁体１８を製造する際の圧延ロールによ
る筋目方向３３に合致するよう形成されている。The pair of ventilation holes 30A, 30A have the same triangular shape, and are formed symmetrically with their corners facing each other. The easily breakable portion 31 includes a pair of ventilation holes 30.
Since the triangular corners of A and 30A are opposed to each other, the broken portion is almost defined as shown by the broken line in FIG. 3B, and the length L and thickness of the broken portion indicate the battery. The breaking strength when receiving internal pressure is set. Further, the easily breakable portion 31 is provided with a pair of ventilation holes 30A, 3A.
A straight line indicated by a broken line in (b) connecting between the hole edges of 0A is formed so as to match the line direction 33 of the rolling roll when the lower metal foil valve element 18 is manufactured.
【００４０】上記接続部２８は、両金属箔部弁体１７，
１８の中心点Ｓに対し、易破断部３１における両通気孔
３０Ａ，３０Ａの各々の孔縁部間を結ぶ直線に平行な線
Ｒ上のいずれかの方向にずれて形成される。したがっ
て、接続部２８は（ｂ）の２点鎖線で示す部位に設けて
もよい。また、固定部３２は、上記中心点Ｓと、両通気
孔３０Ａ，３０Ａの各々の孔縁部間を結ぶ直線の中点を
通る線上に、溶接の中心点を設定して形成されている。The connecting portion 28 is provided with both metal foil valve elements 17,
The central point S is formed so as to be displaced from the center point S in any direction on a line R parallel to a straight line connecting the edge portions of the two ventilation holes 30A, 30A in the easily breakable portion 31. Therefore, the connection portion 28 may be provided at a portion indicated by a two-dot chain line in FIG. Further, the fixing portion 32 is formed by setting a welding center point on a line passing through the center point S and a middle point of a straight line connecting between the respective hole edges of the two ventilation holes 30A, 30A.
【００４１】上記防爆封口板は、絶縁ガスケット１９を
介在して重ね合わせた両金属箔弁体１７，１８の上にＰ
ＴＣ素子２０および金属キャップ２１を重ね合わせた状
態で金属ケース２２内に挿入し、金属ケース２２の上部
を内方にかしめ加工して組立られている。この防爆封口
板を電池ケース３４に挿入するに際しは、（ａ）に示す
ように、電池ケース３４内に収容した極板群３７から導
出したリード体３８を金属ケース２２に溶接により接続
し、極板群３７に電解液を注入した後に、上述のように
組み立てた防爆封口板を、その周囲に絶縁ガスケット３
９を介在させて電池ケース３４の開口部に装着する。そ
ののちに、電池ケース３４の上端部分を内方にかしめ加
工すると、防爆封口板が電池ケース３４を密閉する。The explosion-proof sealing plate is provided on both metal foil valve elements 17, 18 which are superposed with an insulating gasket 19 interposed therebetween.
The TC element 20 and the metal cap 21 are inserted into the metal case 22 in a superposed state, and the upper part of the metal case 22 is crimped inward to assemble. When inserting the explosion-proof sealing plate into the battery case 34, as shown in FIG. 3A, a lead body 38 derived from the electrode group 37 housed in the battery case 34 is connected to the metal case 22 by welding. After the electrolyte is injected into the plate group 37, the explosion-proof sealing plate assembled as described above is placed around the insulating gasket 3 around the explosion-proof sealing plate.
9 is attached to the opening of the battery case 34 with the intermediary 9 interposed. After that, when the upper end portion of the battery case 34 is crimped inward, the explosion-proof sealing plate seals the battery case 34.
【００４２】次に、上記防爆封口板により電池ケース３
４の開口部を密閉してなる密閉型電池の作用について説
明する。通電電流は、極板群３７、リード体３８、金属
ケース２２、下部金属箔弁体１８から接続部２８を介し
て上部金属箔弁体１７、ＰＴＣ素子２０および金属キャ
ップ２１に流れ、電池として機能する。この密閉型電池
では防爆安全機能が３段階に機能する。先ず、第１の防
爆安全機能について説明する。過大電流が流れた場合、
ＰＴＣ素子２０は短時間で動作温度に達して抵抗値が増
大し、通電電流が大幅に減少維持される。それにより、
外部短絡あるいは過大電流での誤使用による電池の著し
い損傷を防止できる。Next, the battery case 3 is provided by the explosion-proof sealing plate.
The operation of the sealed battery having the opening 4 sealed will be described. The current flows from the electrode plate group 37, the lead body 38, the metal case 22, the lower metal foil valve element 18 to the upper metal foil valve element 17, the PTC element 20, and the metal cap 21 via the connection portion 28, and functions as a battery. I do. In this sealed battery, the explosion-proof safety function functions in three stages. First, the first explosion-proof safety function will be described. If excessive current flows,
The PTC element 20 reaches the operating temperature in a short time, the resistance value increases, and the flowing current is greatly reduced and maintained. Thereby,
Significant damage to the battery due to an external short circuit or misuse due to excessive current can be prevented.
【００４３】ところで、リチウム二次電池などでは、充
電器の故障などによる無制御での過充電、あるいは逆充
電、または多数直列過放電などが発生した場合、上記Ｐ
ＴＣ素子２０の動作電流以下の電流値であっても、電池
の安全許容電流を超え、電池内圧が上昇することが多
い。この場合、さらに継続して電池に電流が流れた場合
には、電解液および活物質の分解などを伴いながら電池
温度が急激に上昇して、過大量のガスあるいは蒸気を発
生させるおそれがある。そこで、電池内圧を検知して通
電電流を完全に遮断する第２の防爆安全機能が作用す
る。In the case of a lithium secondary battery or the like, if uncontrolled overcharging or reverse charging due to a failure of a charger or the like, or a large number of series overdischarges occur, the above P
Even if the current value is equal to or less than the operating current of the TC element 20, the safety internal current of the battery is exceeded and the battery internal pressure often rises. In this case, if the current continues to flow through the battery, the battery temperature may rise sharply while decomposing the electrolytic solution and the active material, and an excessive amount of gas or vapor may be generated. Therefore, a second explosion-proof safety function that detects the internal pressure of the battery and completely shuts off the current flow is activated.
【００４４】すなわち、電池内圧が下部金属箔弁体１８
の易破断部３１の破断強度によって設定された所定値ま
で上昇すると、この圧力を金属ケース２２の通気孔２２
ａおよび下部金属箔弁体１８の通気孔３０Ａを通じて受
ける上部金属箔弁体１７は、図２に示すように、凹状部
２３が反転して上方へ向け凸状に変形し、それによって
下部金属箔弁体１８の易破断部３１に剪断力が作用し
て、易破断部３１が破断する。それにより、下部金属箔
弁体１８における分離線部２９、両通気孔３０Ａ，３０
Ａおよび易破断部３１で囲まれた部分は、上部金属箔弁
体１７と共に下部金属箔弁体１８から離れるため、接続
部２８を通じてのみ導通していた両金属箔弁体１７，１
８が離間して通電電流が遮断される。ここで、上部金属
箔弁体１７の薄肉部２４は易破断部３１よりも高い破断
強度に設定されているため、上部金属箔弁体１７は電流
遮断時にそのままの状態を維持して、電解液が漏れ出る
のを防止するので、電解液がＰＴＣ素子２０に付着した
り、電解液が外部に漏出して機器を腐食するといったこ
とが生じない。That is, when the internal pressure of the battery is
When the pressure rises to a predetermined value set by the breaking strength of the easily breakable portion 31 of the metal case 22, the pressure is increased.
2 and the upper metal foil valve element 17 received through the air hole 30A of the lower metal foil valve element 18, the concave portion 23 is inverted and deformed upward and convex as shown in FIG. A shear force acts on the easily breakable portion 31 of the valve element 18 to break the easily breakable portion 31. Thereby, the separation line portion 29 and the two ventilation holes 30A, 30 in the lower metal foil valve element 18 are formed.
A and the portion surrounded by the easily breakable portion 31 are separated from the lower metal foil valve element 18 together with the upper metal foil valve element 17, so that the two metal foil valve elements 17, 1 that were conducted only through the connection portion 28 are provided.
8 are separated, and the energizing current is cut off. Here, since the thin portion 24 of the upper metal foil valve body 17 is set to have a higher breaking strength than the easily breakable portion 31, the upper metal foil valve body 17 maintains its state when current is interrupted, and Is prevented from leaking out, so that the electrolytic solution does not adhere to the PTC element 20 and the electrolytic solution does not leak out and corrode the equipment.
【００４５】そののちに、電池内圧がさらに上昇し続け
た場合には、第３の防爆安全機能が作用する。すなわ
ち、大量のガスまたは蒸気が発生して電池内圧が上部金
属箔弁体１７の薄肉部２４の破断強度によって設定され
た所定値に達すると、その薄肉部２４が開裂し、充満し
ていたガスが金属キャップ２１の排気孔２１ａから電池
の外部に排出される。ここで、下部金属箔弁体１８にお
ける分離線部２９、両通気孔３０Ａ，３０Ａおよび易破
断部３１で囲まれた部分は、Ｃ字形状の薄肉部２４の径
よりも小さい径の環状形状に設定されて、薄肉部２４内
に包含される相対位置で対設されている。したがって、
離間して上部金属箔弁体１７に付着している下部金属箔
弁体１８の一部分は、上部金属箔弁体１７における薄肉
部２４の破断により開口したガス排出孔を塞ぐことがな
く、大量のガス発生時にも内部ガスを迅速に外部排出す
ることができる。Thereafter, if the internal pressure of the battery continues to increase, the third explosion-proof safety function operates. That is, when a large amount of gas or vapor is generated and the internal pressure of the battery reaches a predetermined value set by the breaking strength of the thin portion 24 of the upper metal foil valve body 17, the thin portion 24 is torn and the filled gas is filled. Is discharged out of the battery through the exhaust hole 21a of the metal cap 21. Here, the portion surrounded by the separation line portion 29, the two ventilation holes 30A, 30A, and the easily breakable portion 31 in the lower metal foil valve element 18 has an annular shape having a diameter smaller than the diameter of the C-shaped thin portion 24. It is set and opposed at a relative position included in the thin portion 24. Therefore,
A part of the lower metal foil valve element 18 which is separated and adheres to the upper metal foil valve element 17 does not block the gas discharge hole opened due to the breakage of the thin portion 24 in the upper metal foil valve element 17 and a large amount of Even when gas is generated, the internal gas can be quickly discharged to the outside.
【００４６】上記防爆封口板では、易破断部３１が一対
の通気孔３０Ａ，３０Ａの各々の孔縁部間を結ぶ直線の
長さＬと下部金属箔弁体１８の厚みとにより設定されて
おり、線の長さＬは、図９の易破断部１４に比較して格
段に短い。したがって、図９と同等の破断強度に設定す
る場合、易破断部３１は、長さが格段に短くなった分だ
け図９の場合より厚くすることができ、この下部金属箔
弁体１８の全体を一定の厚みに形成することは容易に行
えるから、易破断部３１は、一対の通気孔３０Ａ，３０
Ａの間隔のみの管理により所定の破断強度に正確に設定
できる。一対の通気孔３０Ａ，３０Ａは打ち抜き加工に
より正確な間隔に製作できるから、この防爆封口板は、
従来の高精度な制御を必要とする刻印加工を用いないこ
とから量産性に優れるとともに、電流遮断圧力に高い信
頼性を得られる。In the explosion-proof sealing plate, the easily breakable portion 31 is set by the length L of a straight line connecting the edge of each of the pair of ventilation holes 30A, 30A and the thickness of the lower metal foil valve element 18. , The length L of the line is much shorter than the easily breakable portion 14 of FIG. Therefore, when the breaking strength is set to be equal to that of FIG. 9, the easily breakable portion 31 can be made thicker than that of FIG. Can easily be formed to a constant thickness, so that the easily breakable portion 31 is formed by a pair of ventilation holes 30A, 30A.
By managing only the interval of A, it is possible to accurately set a predetermined breaking strength. Since the pair of ventilation holes 30A, 30A can be manufactured at an accurate interval by punching, this explosion-proof sealing plate is
Since it does not use the conventional engraving process that requires high-precision control, it excels in mass productivity and can obtain high reliability in the current interruption pressure.
【００４７】しかも、上記防爆封口板は、下記の種々の
手段を講じたことにより電流遮断圧力をより一層正確に
設定できるとともに、破断動作を安定に行わせて高い信
頼性を得られる。先ず、第１に、下部金属箔弁体１８が
接続部２８を介して上部金属箔弁体１７により引っ張り
上げられるときに、下部金属箔弁体１８における易破断
部３１の外側の近傍箇所は固定部３２により金属ケース
２２に離間しないよう保持されるから、易破断部３１
は、下部金属箔弁体１８の展性や絶縁ガスケット１９の
変形による影響を受けて破断強度がばらつくといったこ
とが生じない。しかも、固定部３２は易破断部３１の中
点に対応して形成されているから、易破断部３１にはそ
の全体にわたり均等な保持力が安定に作用する。Furthermore, in the explosion-proof sealing plate, the current interruption pressure can be set more accurately by taking the following various means, and the breaking operation can be performed stably to obtain high reliability. First, when the lower metal foil valve element 18 is pulled up by the upper metal foil valve element 17 via the connection portion 28, a portion of the lower metal foil valve element 18 near the outside of the easily breakable portion 31 is fixed. The portion 32 is held by the metal case 22 so as not to be separated from the metal case 22.
As a result, the breaking strength is not varied due to the influence of the malleability of the lower metal foil valve element 18 and the deformation of the insulating gasket 19. In addition, since the fixing portion 32 is formed corresponding to the midpoint of the easily breakable portion 31, a uniform holding force acts on the easily breakable portion 31 throughout the whole thereof.
【００４８】第２に、接続部２８は、下部金属箔弁体１
８の中心点Ｓから上述の方向にずれた位置に設けられて
いるから、易破断部３１は、その全体が水平に引っ張り
上げらるのではなく、接続部２８により斜め方向に引き
裂く状態で破断されることになり、所定の電池圧力に達
した時点で円滑且つ安定に破断される。第３に、易破断
部３１は、一対の通気孔３０Ａ，３０Ａの各々の三角形
の対向角部で規定された破断方向が下部金属箔弁体１８
の圧延ロールによる筋目方向３３と一致するよう設定し
て形成されているので、常に安定した破断動作を得るこ
とができる。このように、易破断部３１は上述のような
種々の破断のための要件を備えているから、電流遮断圧
力にばらつきが生じない。Second, the connecting portion 28 is formed of the lower metal foil valve element 1.
8 is provided at a position shifted from the center point S in the above-described direction, the easy-to-break portion 31 is not pulled up horizontally as a whole, but is torn in a state of being torn obliquely by the connecting portion 28. When the battery pressure reaches a predetermined value, the battery is broken smoothly and stably. Third, the easy-to-break portion 31 is configured such that the breaking direction defined by the triangular opposing corners of each of the pair of ventilation holes 30A, 30A has a lower metal foil valve body 18.
Is formed so as to coincide with the streak direction 33 by the rolling roll, so that a stable breaking operation can be always obtained. As described above, since the easily breakable portion 31 has the various requirements for breakage as described above, the current interruption pressure does not vary.
【００４９】上記第１の実施の形態の防爆封口板および
図９の従来の防爆封口板の各々の電流遮断圧力を図３に
示す検査装置により測定した。すなわち、防爆封口板を
筒型の一対の電極体４０，４１により気密に挟み付け、
この電極体４０，４１を介して電源４２から防爆封口板
に電流を供給した状態において、高圧空気源４３から電
極体４１を通じて防爆封口板に加える高圧空気を毎秒0.
6 ｋｇ／ｃｍ2 で徐々に昇圧させていき、易破断部３１
が破断して電流が遮断されたのを検流計４４が検知した
ときの圧力センサ４７の指示値を電流遮断圧力として計
測した。その結果を（表１）に示す。The current interruption pressure of each of the explosion-proof sealing plate of the first embodiment and the conventional explosion-proof sealing plate of FIG. 9 was measured by an inspection device shown in FIG. That is, the explosion-proof sealing plate is hermetically sandwiched between a pair of cylindrical electrode bodies 40 and 41,
In a state where a current is supplied from the power supply 42 to the explosion-proof sealing plate via the electrode bodies 40 and 41, the high-pressure air supplied to the explosion-proof sealing plate from the high-pressure air source 43 through the electrode body 41 is applied at a rate of 0.1 mm / s.
Gradually increase the pressure at 6 kg / cm 2 ,
The value indicated by the pressure sensor 47 when the galvanometer 44 detects that the current was interrupted due to the breakage was measured as the current interruption pressure. The results are shown in (Table 1).
【００５０】[0050]
【表１】 [Table 1]
【００５１】この表１から明らかなように、従来の防爆
封口板では標準偏差が1.28であったのが、上記実施の形
態の防爆封口板の場合には、標準偏差が0.30に大幅に低
減している。なお、標準偏差σは下記の式（１）に基づ
き計算した。式（１）において、ｘi は上記装置により
測定した電流遮断圧力、ｘ0 は平均値、ｎは測定回数を
それぞれ示す。As is apparent from Table 1, the standard deviation was 1.28 in the conventional explosion-proof sealing plate, but in the case of the explosion-proof sealing plate of the above embodiment, the standard deviation was greatly reduced to 0.30. ing. The standard deviation σ was calculated based on the following equation (1). In the formula (1), x i is the current cut-off pressure measured by the device, x 0 is the mean value, n represents shows the number of measurements.
【００５２】[0052]
【数１】 (Equation 1)
【００５３】上記実施の形態の防爆封口板の易破断部３
１は、一対の三角形状の通気孔３０Ａ，３０Ａの各々の
角部を相対向させることにより、破断される箇所がほぼ
規定されている。この易破断部３１は、図４（ａ）に示
す円形の一対の通気孔３０Ｂ、３０Ｂ、または同図
（ｂ）に示す四角形状の一対の通気孔３０Ｃ、３０Ｃの
各々の角部を相対向させて形成し、それらの角部の間に
形成してもよい。この場合、いずれの通気孔３０Ｂ，３
０Ｃも、同一形状のものを一対用いて、対称配置に形成
すれば、上記実施の形態と同様の破断効果を得ることが
できる。The easily breakable portion 3 of the explosion-proof sealing plate of the above embodiment
In 1, a portion to be broken is substantially defined by making the corners of a pair of triangular ventilation holes 30 </ b> A face each other. The easily breakable portion 31 faces each corner of a pair of circular ventilation holes 30B, 30B shown in FIG. 4A or a pair of square ventilation holes 30C, 30C shown in FIG. 4B. It may be formed so as to be formed between the corners. In this case, any of the ventilation holes 30B, 3
The same breaking effect as in the above-described embodiment can be obtained by forming a pair of the same shape for 0C in a symmetrical arrangement.
【００５４】図５は、本発明の第２の実施の形態に係る
密閉型電池用防爆封口板における下部金属箔弁体１８を
示す平面図である。この下部金属箔弁体１８は、易破断
部３１に、三角形状の一対の通気孔３０Ａ，３０Ａの孔
縁部間を結ぶ直線に沿って破断規定線部となるミシン目
４８が形成されており、その他の構成は第１の実施の形
態と同様である。したがって、易破断部３１は、ミシン
目４８によって破断部位が確実に規制されるから、破断
動作を安定に且つ円滑に行わせることができ、電流遮断
圧力を一層確実に所定値に設定することができる。な
お、ミシン目４８に代えて、薄肉の溝部を形成しても、
上記と同様の効果を得ることができる。FIG. 5 is a plan view showing the lower metal foil valve element 18 in the sealed battery explosion-proof sealing plate according to the second embodiment of the present invention. In the lower metal foil valve element 18, a perforation 48 is formed in the easily breakable portion 31 along a straight line connecting a pair of triangular vent holes 30A, 30A, and a break defining line portion. The other configuration is the same as that of the first embodiment. Therefore, since the easily breakable portion 31 is reliably restricted at the break portion by the perforations 48, the break operation can be performed stably and smoothly, and the current interrupting pressure can be more reliably set to the predetermined value. it can. Even if a thin groove is formed instead of the perforation 48,
The same effects as above can be obtained.
【００５５】図６は本発明の第３の実施の形態に係る密
閉型電池用防爆封口板を示す縦断面図である。この実施
の形態の防爆封口板が第１および第２の実施の形態のも
のと異なるのは、下部金属箔弁体１８の易破断部３１に
対し外側の近傍箇所に設ける固定部４９の構成のみであ
り、その他の構成は上記各実施の形態と同様である。FIG. 6 is a longitudinal sectional view showing an explosion-proof sealing plate for a sealed battery according to a third embodiment of the present invention. The only difference between the explosion-proof sealing plate of this embodiment and those of the first and second embodiments is the configuration of the fixing portion 49 provided at a location outside the easily breakable portion 31 of the lower metal foil valve element 18 and outside. The other configuration is the same as that of each of the above embodiments.
【００５６】この実施の形態の固定部４９は、金属ケー
ス２２における易破断部３１の外周側の近傍部位の対応
箇所に、上方に突出する凸部２２ｂを設け、この凸部２
２ｂにより下部金属箔弁体１８の対応箇所が押し上げら
れて絶縁ガスケット１９との間で局部的に強く金属ケー
ス２２に圧接された構成になっている。なお、この固定
部４９は、金属ケース２２の凸部２２ｂに代えて、絶縁
ガスケット１９に下方へ突出する凸部を設けて構成して
もよい。The fixing portion 49 of this embodiment is provided with a protruding portion 22b projecting upward at a position corresponding to a portion of the metal case 22 near the outer peripheral side of the easily breakable portion 31.
2b pushes the corresponding portion of the lower metal foil valve element 18 up and is locally strongly pressed against the metal case 22 with the insulating gasket 19. Note that the fixing portion 49 may be configured by providing a convex portion projecting downward on the insulating gasket 19 instead of the convex portion 22b of the metal case 22.
【００５７】上記固定部４９は、第１の実施の形態の防
爆封口板の固定部３２と同様に、電池内圧により上部金
属箔弁体１７の凹状部２３が変形するのに伴って下部金
属箔弁体１８における分離線部２９の内方部位が引き上
げられるときに、下部金属箔弁体１８における易破断部
３１の外方箇所が金属ケース２２に押し付けて引き上げ
られるのを阻止する。それにより、下部金属箔弁体１８
の展性により易破断部３１の破断強度がばらつくのを確
実に防止できるから、易破断部３１は所定の電池内圧に
達した時点でばらつきなく確実に破断される。The fixing portion 49 is, like the fixing portion 32 of the explosion-proof sealing plate of the first embodiment, a lower metal foil as the concave portion 23 of the upper metal foil valve 17 is deformed by the internal pressure of the battery. When the inner part of the separation line portion 29 in the valve element 18 is pulled up, the outer part of the easily breakable portion 31 in the lower metal foil valve element 18 is pressed against the metal case 22 and is prevented from being pulled up. Thereby, the lower metal foil valve element 18
Variations in the breaking strength of the easily breakable portion 31 due to the malleability can be reliably prevented, so that the easily breakable portion 31 is reliably broken without variation when it reaches a predetermined battery internal pressure.
【００５８】つぎに、第１または第２の実施の形態に係
る防爆封口板の製造方法について説明する。図７（ａ）
は、金属ケース２２と下部金属箔弁体１８との各々の所
定部位を相互に溶着して固定部３２を形成する工程を示
す。金属ケース２２内に、分離線部２９、通気孔３０
Ａ，３０Ａおよび易破断部３１を予め形成した下部金属
箔弁体１８、或いは上記構成に加えてミシン目４８を形
成した下部金属箔弁体１８を挿入する。続いて、金属ケ
ース２２と下部金属箔弁体１８とを、光通過孔５７ａを
有する固定治具５７と熱退避用空間５８ａを有する固定
治具５８により両側から挟み付け、金属ケース２２の所
定部位に、レーザー溶接機５４から光通過孔５７ａを通
じレーザー光を照射して、下部金属箔弁体１８における
易破断部３１の外周側近接部位と金属ケース２２とを相
互にレーザー溶接して固定部３２を形成する。ここで、
互いの溶接すべき箇所である金属ケース２２と下部金属
箔弁体１８の周縁部分とは、共に平坦面であるから、直
接的に押圧しなくても隙間なく密着し、支障なくレーザ
ー溶接できる。Next, a method for manufacturing the explosion-proof sealing plate according to the first or second embodiment will be described. FIG. 7 (a)
Shows a step of forming the fixing portion 32 by welding predetermined portions of the metal case 22 and the lower metal foil valve element 18 to each other. In the metal case 22, a separation line portion 29 and a vent hole 30
A, 30A and the lower metal foil valve element 18 in which the easily breakable portion 31 is formed in advance, or the lower metal foil valve element 18 in which the perforations 48 are formed in addition to the above configuration, are inserted. Subsequently, the metal case 22 and the lower metal foil valve element 18 are sandwiched from both sides by a fixing jig 57 having a light passage hole 57a and a fixing jig 58 having a heat evacuating space 58a. Then, a laser beam is radiated from the laser welding machine 54 through the light passage hole 57a, and a portion of the lower metal foil valve element 18 adjacent to the outer peripheral side of the easily breakable portion 31 and the metal case 22 are mutually laser-welded to fix the fixing portion 32. To form here,
Since the metal case 22 and the peripheral portion of the lower metal foil valve element 18, both of which are to be welded to each other, are flat surfaces, they can be tightly adhered to each other without any gap without direct pressing, and laser welding can be performed without any trouble.
【００５９】次工程では、両金属箔弁体１７，１８相互
間に接続部２８を形成する。図７（ｂ）に示すように、
絶縁ガスケット１９および上部金属箔弁体１７を金属ケ
ース２２内に順次挿入して、両金属箔弁体１７，１８の
各々の周縁部分を絶縁ガスケット１９を介在して重ね合
わせる。絶縁ガスケット１９を介在して重ね合わされた
両金属箔弁体１７，１８の各々の周縁部分を、上下の固
定治具５２，５３により金属ケース２２を介在して挟み
付け、固定する。In the next step, a connecting portion 28 is formed between the two metal foil valve elements 17 and 18. As shown in FIG.
The insulating gasket 19 and the upper metal foil valve element 17 are sequentially inserted into the metal case 22, and the respective peripheral portions of the two metal foil valve elements 17 and 18 are overlapped with the insulating gasket 19 interposed therebetween. The peripheral portions of the two metal foil valve bodies 17 and 18 superposed with the insulating gasket 19 interposed therebetween are sandwiched and fixed by the upper and lower fixing jigs 52 and 53 with the metal case 22 interposed therebetween.
【００６０】つぎに、凹状部２３および凸状部２７の各
々の接触部分の所定部位に、レーザー溶接機５４から上
部固定治具５２の光通過孔５２ａを通じレーザー光を照
射してレーザー溶接し、接続部２８を形成する。図７
（ｂ）に示すように、上部金属箔弁体１７を金属ケース
２２内に挿入して、上部金属箔弁体１７の周縁部分を絶
縁ガスケット１９上に載置すると、上部および下部の金
属箔弁体１７，１８の各々の凹状部２３と凸状部２７と
の先端部同士が互いに接触する。すなわち、下部金属箔
弁体１８の凸状部２７および上部金属箔弁体１７の凹状
部２３は、下部金属箔弁体１８の周縁部上面から凸状部
２７の先端までの突出寸法をｄ１、上部金属箔弁体１７
の周縁部下面から凹状部２３先端までの突出寸法をｄ
２、絶縁ガスケット１９の厚みをＤとしたときに、ｄ１
＋ｄ２＞Ｄの寸法関係に設定されている。Next, laser welding is performed by irradiating a laser beam from a laser welding machine 54 through a light passage hole 52a of an upper fixing jig 52 to a predetermined portion of the contact portion of each of the concave portion 23 and the convex portion 27. The connection part 28 is formed. FIG.
As shown in (b), when the upper metal foil valve 17 is inserted into the metal case 22 and the peripheral portion of the upper metal foil valve 17 is placed on the insulating gasket 19, the upper and lower metal foil valves 17 The tips of the concave portions 23 and the convex portions 27 of the bodies 17 and 18 are in contact with each other. That is, the convex portion 27 of the lower metal foil valve element 18 and the concave portion 23 of the upper metal foil valve element 17 have a protrusion dimension d1 from the upper peripheral edge of the lower metal foil valve element 18 to the tip of the convex portion 27, and Upper metal foil valve element 17
The protrusion dimension from the lower edge of the peripheral portion to the tip of the concave portion 23 is d
2. When the thickness of the insulating gasket 19 is D, d1
+ D2> D.
【００６１】上述の絶縁ガスケット１９を介在して重ね
合わされた両金属箔弁体１７，１８の各々の周縁部分
を、上下の固定治具５２，５３により金属ケース２２を
介在して挟み付け、固定する。このとき、上記のｄ１＋
ｄ２＞Ｄの寸法関係から明らかなように、凹状部２３お
よび凸状部２７が僅かに撓められて、それらの各々の先
端部位は、屈撓による復元力によって互いに強く押し付
け合って、隙間のない状態に密着する。つぎに、凹状部
２３および凸状部２７の各々の接触部分の所定部位に、
レーザー溶接機５４から上部固定治具５２の光通過孔５
２ａを通じレーザー光を照射してレーザー溶接し、接続
部２８を形成する。The peripheral portions of the metal foil valve bodies 17 and 18 which are overlapped with the above-mentioned insulating gasket 19 interposed therebetween are fixed by upper and lower fixing jigs 52 and 53 with a metal case 22 interposed therebetween. I do. At this time, the above d1 +
As is clear from the dimensional relationship of d2> D, the concave portion 23 and the convex portion 27 are slightly bent, and their respective tip portions are strongly pressed against each other by a restoring force due to bending, and the gap between the concave portion 23 and the convex portion 27 is reduced. Close contact with no condition. Next, at a predetermined portion of each contact portion of the concave portion 23 and the convex portion 27,
Light passing hole 5 of upper fixing jig 52 from laser welding machine 54
The connection portion 28 is formed by irradiating a laser beam through 2a and performing laser welding.
【００６２】ところで、レーザー溶接は、溶着強度の高
い溶着部を形成できるものであって、被溶接物が剛性体
や厚みの大きいものである場合にはそれ自体が変形しな
いことから支障なく溶接を行える。しかし、本発明にお
ける被溶接物である金属箔弁体１７，１８は、0.1 〜0.
15ｍｍ程度の厚みの薄いものであって変形し易いため、
レーザー溶接するに際してこれらの被溶接部位を互いに
密着状態に保持する必要があるが、それらの被溶接部位
を、固定治具を両側から押し付ける手段などにより密着
させるようなことはできない。なぜならば、一方の固定
治具にはレーザー光の通過孔を、他方の固定治具におけ
るレーザー光の照射箇所には熱影響を避けるための空間
を、それぞれ必要とするためである。もし、被溶接部位
に隙間が生じると、レーザー光を照射される一方の被溶
接部材から他方の被溶接部材への熱伝導が不十分とな
り、溶接不良や孔があくなどの欠陥が生じる。By the way, laser welding is capable of forming a welded portion having a high welding strength. If the object to be welded is a rigid body or a thick material, it does not deform itself, so that welding can be performed without any trouble. I can do it. However, the metal foil valve elements 17 and 18 which are the objects to be welded in the present invention are 0.1 to 0.1.
Because it is thin with a thickness of about 15 mm and easily deformed,
When performing laser welding, it is necessary to keep these welded parts in close contact with each other, but these welded parts cannot be brought into close contact with each other by means of pressing the fixing jig from both sides. This is because one fixing jig requires a laser light passage hole, and the other fixing jig requires a space for avoiding thermal effects at the laser beam irradiation location. If a gap is formed in a portion to be welded, heat conduction from one member to be irradiated with the laser beam to the other member to be welded becomes insufficient, and defects such as poor welding and drilling occur.
【００６３】これに対し、本発明の製造方法では、被溶
接物である両金属箔弁体１７，１８の凹状部２３および
凸状部２７は、絶縁ガスケット１９の厚みＤに対し上記
のようにｄ１＋ｄ２＞Ｄの寸法関係に設定したので、凹
状部２３と凸状部２７とは、保持手段を用いることなく
各々の先端部同士を密着同士に保持することができる。
そのため、溶接不良や穿孔が生じることがなく、強固な
接続部２８を歩留りよく形成することができる。なお、
図７の工程以後は、従来と同様の工程により防爆封口板
を製作する。On the other hand, according to the manufacturing method of the present invention, the concave portions 23 and the convex portions 27 of the two metal foil valve bodies 17 and 18 as the objects to be welded are as described above with respect to the thickness D of the insulating gasket 19. Since the dimensional relationship of d1 + d2> D is set, the concave portion 23 and the convex portion 27 can hold their respective tips in close contact with each other without using holding means.
Therefore, a strong connection portion 28 can be formed with good yield without causing poor welding or perforation. In addition,
After the process of FIG. 7, the explosion-proof sealing plate is manufactured by the same process as the conventional one.
【００６４】[0064]
【発明の効果】以上のように、本発明の密閉型電池用防
爆封口板によれば、易破断部の破断強度を一対の通気孔
の各々の孔縁部間を結ぶ直線の長さにより設定する構成
としたので、易破断部は、長さが格段に短くなった分だ
け大きな厚みで所定の破断強度に正確に設定でき、ま
た、一対の通気孔は、その間隔を正確に形成するのは容
易であるから、破断強度にばらつきが生じない。したが
って、この防爆封口板は、量産性に優れるとともに、電
流遮断圧力に高い信頼性を得ることができる。As described above, according to the explosion-proof sealing plate for a sealed battery of the present invention, the breaking strength of the easily breakable portion is set by the length of the straight line connecting between the edge portions of the pair of ventilation holes. Since the breakable structure is adopted, the easily breakable portion can be accurately set to a predetermined breaking strength with a thickness that is much shorter than the length, and the pair of ventilation holes form the gap precisely. Is easy, and there is no variation in the breaking strength. Therefore, this explosion-proof sealing plate is excellent in mass productivity and can obtain high reliability in the current interruption pressure.
【００６５】本発明に係る密閉型電池用防爆封口板の製
造方法によれば、共に平坦面である金属ケースと下部金
属箔弁体の周縁部分とを隙間なく密着させてレーザー溶
接することにより、強固な固定部を確実に形成できる。
また、両金属箔弁体の各々の凹状部および凸状部の各々
の先端部位を隙間のない状態に密着させてレーザー溶接
することにより、溶接不良や穿孔のない強固な接続部を
歩留りよく形成することができる。According to the method for manufacturing the explosion-proof sealing plate for a sealed battery according to the present invention, the metal case, which is a flat surface, and the peripheral portion of the lower metal foil valve element are brought into close contact with each other by laser welding without any gap. A strong fixed part can be reliably formed.
In addition, by tightly contacting the respective tip portions of each of the concave and convex portions of both metal foil valve elements with no gap, and performing laser welding, a strong connection portion with no defective welding or perforation is formed with good yield. can do.
【図１】本発明の第１の実施の形態に係る密閉型電池用
防爆封口板を示し、（ａ）は縦断面図、（ｂ）は（ａ）
における下部金属箔弁体のみの平面図。FIG. 1 shows an explosion-proof sealing plate for a sealed battery according to a first embodiment of the present invention, wherein (a) is a longitudinal sectional view and (b) is (a).
FIG. 3 is a plan view of only the lower metal foil valve element in FIG.
【図２】同上防爆封口板の下部金属箔弁体が破断した状
態の縦断面図。FIG. 2 is a longitudinal sectional view showing a state in which a lower metal foil valve body of the explosion-proof sealing plate is broken.
【図３】同上防爆封口板の検査装置の概略を示す水平断
面図。FIG. 3 is a horizontal sectional view schematically showing an inspection device for the explosion-proof sealing plate.
【図４】（ａ），（ｂ）はいずれも下部金属箔弁体に形
成する一対の通気孔の変形例を示す平面図。4A and 4B are plan views each showing a modified example of a pair of ventilation holes formed in a lower metal foil valve body.
【図５】本発明の第２の実施の形態に係る密閉型電池用
防爆封口板における下部金属箔弁体を示す平面図。FIG. 5 is a plan view showing a lower metal foil valve element in an explosion-proof sealing plate for a sealed battery according to a second embodiment of the present invention.
【図６】本発明の第３の他の実施の形態に係る密閉型電
池用防爆封口板を示す縦断面図。FIG. 6 is a longitudinal sectional view showing an explosion-proof sealing plate for a sealed battery according to a third other embodiment of the present invention.
【図７】第１または第２の実施の形態に係る密閉型電池
用防爆封口板の製造方法を示す工程図。FIG. 7 is a process chart showing a method of manufacturing the explosion-proof sealing plate for a sealed battery according to the first or second embodiment.
【図８】従来の密閉型電池用防爆封口板を示す縦断面
図。FIG. 8 is a longitudinal sectional view showing a conventional explosion-proof sealing plate for a sealed battery.
【図９】従来の他の密閉型電池用防爆封口板を示す縦断
面図。FIG. 9 is a longitudinal sectional view showing another conventional explosion-proof sealing plate for a sealed battery.
１７ 上部金属箔弁体 １８ 下部金属箔弁体 １８ａ 凸部 １９ 絶縁ガスケット １９ａ 凸部 ２１ 金属キャップ ２２ 金属ケース ２３ 凹状部 ２７ 凸状部 ２８ 接続部 ２９ 分離線部 ３０Ａ〜３０Ｃ 通気孔 ３２，４９ 固定部 ３３ 筋目方向 ３４ 電池ケース ４８ ミシン目（破断規定線部） ５２，５３ 固定治具 ５７，５８ 固定治具 17 Upper metal foil valve element 18 Lower metal foil valve element 18a Convex part 19 Insulating gasket 19a Convex part 21 Metal cap 22 Metal case 23 Concave part 27 Convex part 28 Connection part 29 Separation line part 30A to 30C Vent holes 32, 49 Fixed Part 33 Streak direction 34 Battery case 48 Perforation (fracture specified line part) 52, 53 Fixing jig 57, 58 Fixing jig
フロントページの続き (72)発明者 大尾 文夫 大阪府門真市大字門真1006番地 松下電器 産業株式会社内Continued on the front page (72) Inventor Fumio Oo 1006 Odakadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (12)
を密閉するとともに、電池内圧が設定値まで上昇したと
きに一部が破断して通電電流を遮断する密閉型電池用防
爆封口板において、 導電性を有する上部および下部の両金属箔弁体が、それ
らの周縁部間に絶縁ガスケットを介在して重ね合わさ
れ、且つ各々の中央部位を互いに溶着した接続部のみを
介して電気的に導通され、 前記両金属箔弁体が、前記上部金属箔弁体の上部に金属
キャップを配置して金属ケース内に挿入されてなり、 前記下部金属箔弁体は、 前記接続部を囲むように設けられた分離線部と、 前記分離線部の両端部に連設されて相対向し、電池内圧
を前記上部金属箔弁体に作用させる一対の通気孔と、 前記両通気孔の相対向する各々の孔縁部間の部分により
形成され、電池内圧が所定値に達した時に破断する易破
断部とを備え、 電池内圧が所定値に達したときに、前記上部金属箔弁体
の上方への変形による応力を受けて前記易破断部が破断
することにより、前記分離線部、前記両通気孔および前
記易破断部で囲まれる部分が前記上部金属箔弁体と共に
分離するように構成されたことを特徴とする密閉型電池
用防爆封口板。Claims: 1. An explosion-proof sealing plate for a sealed battery for sealing an opening of a battery case accommodating a power generating element and partially breaking the cut-off current when a battery internal pressure rises to a set value, thereby cutting off a current flow. Both the upper and lower metal foil valve bodies having conductivity are overlapped with an insulating gasket between their peripheral portions, and are electrically connected only through the connection portions where the respective central portions are welded to each other. The two metal foil valve elements are inserted into a metal case with a metal cap disposed on the upper metal foil valve element, and the lower metal foil valve element is provided so as to surround the connection part. And a pair of air holes which are provided at both ends of the separation line portion and face each other, and which apply a battery internal pressure to the upper metal foil valve element. Formed by the area between the hole edges, An easily breakable portion that breaks when the internal pressure of the pond reaches a predetermined value; and when the internal pressure of the battery reaches a predetermined value, the easily breakable portion receives stress due to upward deformation of the upper metal foil valve body. An explosion-proof sealing plate for a sealed battery, wherein a portion surrounded by the separation line portion, the two ventilation holes, and the easy-to-break portion is separated together with the upper metal foil valve body by breaking. .
は、両通気孔の各々の孔縁部間を結ぶ直線の中点に対
し、前記直線に平行な線上において何れかの方向にずれ
た位置に形成されている請求項１に記載の密閉型電池用
防爆封口板。2. A connection portion between the upper and lower metal foil valve bodies may be in any direction on a line parallel to the straight line with respect to a midpoint of a straight line connecting between the edge portions of the two ventilation holes. The explosion-proof sealing plate for a sealed battery according to claim 1, which is formed at a shifted position.
部金属箔弁体を金属ケースに局部的に固定する固定部を
設けた請求項１または請求項２に記載の密閉型電池用防
爆封口板。3. The explosion-proof seal for a sealed battery according to claim 1, wherein a fixing portion for locally fixing the lower metal foil valve body to the metal case is provided at a position near the outer peripheral side with respect to the easily breakable portion. Board.
破断部を結ぶ環状の中心点と、前記両通気孔の各々の孔
縁部間を結ぶ直線の中点とを通る線上に、前記固定部の
中心点を設定して形成されている請求項３に記載の密閉
型電池用防爆封口板。4. The fixing portion is formed on a line passing through a separation line portion, an annular center point connecting the two ventilation holes and the easily breakable portion, and a midpoint of a straight line connecting the edge portions of the two ventilation holes. The explosion-proof sealing plate for a sealed battery according to claim 3, wherein the fixing portion is formed by setting a center point of the fixing portion.
との所定の対面部位を互いに溶接した溶着部からなる請
求項３または請求項４に記載に密閉型電池用防爆封口
板。5. The explosion-proof sealing plate for a sealed battery according to claim 3, wherein the fixing portion comprises a welded portion obtained by welding predetermined portions of the lower metal foil valve element and the metal case to each other.
ットに設けた凸部によって下部金属箔弁体が局部的に強
く金属ケースに圧接されるように構成されている請求項
３または請求項４に記載に密閉型電池用防爆封口板。6. The fixing portion according to claim 3, wherein the lower metal foil valve body is locally strongly pressed against the metal case by a convex portion provided on the metal case or the insulating gasket. Explosion-proof sealing plate for sealed batteries as described.
形状に形成されるとともに、共に同一形状のものが対称
配置に形成されている請求項１ないし請求項６のいずれ
かに記載の密閉型電池用防爆封口板。7. The pair of ventilation holes of the lower metal foil valve body are formed in a polygonal shape, and the ones having the same shape are formed in a symmetrical arrangement. Explosion-proof sealing plate for sealed batteries.
のスリットからなり、その両端部が一対の通気孔にそれ
ぞれ連通するよう形成されている請求項１ないし請求項
７のいずれかに記載の密閉型電池用防爆封口板。8. The separation line portion of the lower metal foil valve body is formed of a C-shaped slit, and both end portions thereof are formed so as to communicate with a pair of ventilation holes, respectively. An explosion-proof sealing plate for a sealed battery according to Crab.
の通気孔の各々の孔縁部間を結ぶ直線が、前記下部金属
箔弁体を製造する際の圧延ロールによる筋目方向に合致
するように形成されている請求項１ないし請求項８のい
ずれかに記載の密閉型電池用防爆封口板。9. The easily breakable portion of the lower metal foil valve element has a straight line connecting between the respective hole edges of the pair of ventilation holes in a direction parallel to a rolling roll when the lower metal foil valve element is manufactured. The explosion-proof sealing plate for a sealed battery according to any one of claims 1 to 8, which is formed so as to match.
の通気孔の孔縁部間を結ぶ直線に沿って形成されたミシ
ン目または細い溝からなる破断規定線が設けられている
請求項１ないし請求項９のいずれかに記載の密閉型電池
用防爆封口板。10. A fracture defining line formed of a perforation or a narrow groove formed along a straight line connecting between the edge portions of a pair of ventilation holes is provided at an easily breakable portion of the lower metal foil valve body. An explosion-proof sealing plate for a sealed battery according to any one of claims 1 to 9.
向け膨出した凹状部が設けられ、 下部金属箔弁体に、中央部分が上方へ向け膨出し、その
膨出部分の外周に沿って分離線部、一対の通気孔および
易破断部が環状に配して形成された凸状部が設けられ、 前記両金属箔弁体が、前記凹状部と前記凸状部との接触
部位を溶接により互いに溶着した接続部を介して電気的
導通状態に連結されている請求項１ないし請求項１０の
いずれかに記載の密閉型電池用防爆封口板。11. An upper metal foil valve body is provided with a concave portion whose central portion swells downward, and the lower metal foil valve body has a central portion swelling upward and an outer periphery of the bulging portion. A protruding portion formed by annularly arranging a separation line portion, a pair of ventilation holes and an easily breakable portion is provided, and the two metal foil valve elements are in contact with the concave portion and the protruding portion. The explosion-proof sealing plate for a sealed type battery according to any one of claims 1 to 10, wherein the sealing plates are electrically connected to each other through connection portions welded to each other by welding.
口板の製造方法であって、 中央部分が上方へ向け膨出した凸状部を有する下部金属
箔弁体を金属ケース内に挿入して、前記下部金属箔弁体
における周縁部の所定部位と金属ケースの対面部位とを
レーザー溶接により相互に溶着して固定部を形成する工
程と、 中央部分が下方へ向け膨出した凹状部を有する上部金属
箔弁体を前記金属ケース内に挿入して、前記両金属箔弁
体の各々の周縁部分を絶縁ガスケットを介在して重ね合
わせ、前記凹状部と前記凸状部との各々の先端部位を互
いに接触させる工程と、 前記両金属箔弁体における各々の周縁部分を固定治具に
より上下から挟み付けて固定する工程と、 前記凹状部と前記凸状部との互いに接触する部位をレー
ザー溶接により相互に溶着して接続部を形成する工程
と、 を有する密閉型電池用防爆封口板の製造方法。12. The method for manufacturing an explosion-proof sealing plate for a sealed battery according to claim 5, wherein a lower metal foil valve body having a convex portion whose central portion bulges upward is inserted into the metal case. Forming a fixed portion by welding a predetermined portion of a peripheral portion of the lower metal foil valve body and a facing portion of the metal case to each other by laser welding; and a concave portion having a central portion bulging downward. Inserting the upper metal foil valve element having the above, into the metal case, the peripheral portions of the two metal foil valve elements are overlapped with an insulating gasket interposed therebetween, and each of the concave portion and the convex portion Contacting the tip parts with each other; fixing and fixing each peripheral portion of the two metal foil valve elements from above and below with a fixing jig; and contacting the concave part and the convex part with each other. Welded together by laser welding Method of manufacturing a sealed battery explosion 爆封 port plate and a step of forming a connecting portion Te.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08384097A JP3853461B2 (en) | 1997-04-02 | 1997-04-02 | Explosion-proof sealing plate for sealed battery and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08384097A JP3853461B2 (en) | 1997-04-02 | 1997-04-02 | Explosion-proof sealing plate for sealed battery and method for manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10284035A true JPH10284035A (en) | 1998-10-23 |
| JP3853461B2 JP3853461B2 (en) | 2006-12-06 |
Family
ID=13813914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08384097A Expired - Fee Related JP3853461B2 (en) | 1997-04-02 | 1997-04-02 | Explosion-proof sealing plate for sealed battery and method for manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3853461B2 (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1131490A (en) * | 1997-07-09 | 1999-02-02 | Matsushita Electric Ind Co Ltd | Explosion-proof type sealed battery |
| WO2000062357A1 (en) * | 1999-04-12 | 2000-10-19 | Toyo Kohan Co., Ltd. | Safety device for enclosed cell and enclosed cell comprising the same |
| WO2001037355A1 (en) * | 1999-11-19 | 2001-05-25 | Eveready Battery Company, Inc. | Electrochemical cell having venting cover |
| WO2001078165A1 (en) * | 2000-04-05 | 2001-10-18 | Toyo Kohan Co., Ltd. | Enclosed battery, sealed body, and outer packaged container |
| US6805991B2 (en) * | 2000-01-14 | 2004-10-19 | Sony Corporation | Nonaqueous electrolyte solution secondary battery |
| JP3655643B2 (en) * | 1997-04-21 | 2005-06-02 | 東洋鋼鈑株式会社 | Sealed battery |
| JP2005276838A (en) * | 2004-03-24 | 2005-10-06 | Samsung Sdi Co Ltd | Cap assembly and secondary battery equipped with this |
| JP2006216358A (en) * | 2005-02-03 | 2006-08-17 | Matsushita Electric Ind Co Ltd | Sealed battery |
| JP2006351512A (en) * | 2005-05-16 | 2006-12-28 | Matsushita Electric Ind Co Ltd | Sealed secondary battery and its manufacturing method |
| EP1933403A2 (en) * | 2006-12-14 | 2008-06-18 | Samsung SDI Co., Ltd. | Secondary Battery |
| WO2009082958A1 (en) * | 2007-12-25 | 2009-07-09 | Byd Company Limited | Construction of electrochemical storage cell |
| JP2009170398A (en) * | 2007-12-20 | 2009-07-30 | Komatsulite Mfg Co Ltd | Safety device for battery |
| US7572545B2 (en) | 2006-05-24 | 2009-08-11 | Everyready Battery Company, Inc. | Battery can having vent and asymmetric welded cover |
| US7875376B2 (en) | 2006-05-24 | 2011-01-25 | Eveready Battery Company, Inc. | Battery can having off-center C-shaped vent |
| US8158280B2 (en) | 2006-05-24 | 2012-04-17 | Eveready Battery Company, Inc. | Battery container having cruciform vent and cover |
| CN105870393A (en) * | 2015-01-22 | 2016-08-17 | 松下能源(无锡)有限公司 | Insulating plate for battery and battery with insulating plate |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170075658A (en) * | 2015-12-23 | 2017-07-03 | 신흥에스이씨주식회사 | CID assembly for a secondary battery with excellent durability |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06215747A (en) * | 1992-09-29 | 1994-08-05 | Matsushita Electric Ind Co Ltd | Explosion-proof sealing plate for sealed battery |
| JPH07105933A (en) * | 1993-10-06 | 1995-04-21 | Hitachi Maxell Ltd | Anti-explosive enclosed battery |
-
1997
- 1997-04-02 JP JP08384097A patent/JP3853461B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06215747A (en) * | 1992-09-29 | 1994-08-05 | Matsushita Electric Ind Co Ltd | Explosion-proof sealing plate for sealed battery |
| JPH07105933A (en) * | 1993-10-06 | 1995-04-21 | Hitachi Maxell Ltd | Anti-explosive enclosed battery |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3655643B2 (en) * | 1997-04-21 | 2005-06-02 | 東洋鋼鈑株式会社 | Sealed battery |
| JPH1131490A (en) * | 1997-07-09 | 1999-02-02 | Matsushita Electric Ind Co Ltd | Explosion-proof type sealed battery |
| WO2000062357A1 (en) * | 1999-04-12 | 2000-10-19 | Toyo Kohan Co., Ltd. | Safety device for enclosed cell and enclosed cell comprising the same |
| WO2001037355A1 (en) * | 1999-11-19 | 2001-05-25 | Eveready Battery Company, Inc. | Electrochemical cell having venting cover |
| US6348281B1 (en) | 1999-11-19 | 2002-02-19 | Eveready Battery Company, Inc. | Electrochemical cell having venting cover |
| US6805991B2 (en) * | 2000-01-14 | 2004-10-19 | Sony Corporation | Nonaqueous electrolyte solution secondary battery |
| WO2001078165A1 (en) * | 2000-04-05 | 2001-10-18 | Toyo Kohan Co., Ltd. | Enclosed battery, sealed body, and outer packaged container |
| JP2005276838A (en) * | 2004-03-24 | 2005-10-06 | Samsung Sdi Co Ltd | Cap assembly and secondary battery equipped with this |
| JP2006216358A (en) * | 2005-02-03 | 2006-08-17 | Matsushita Electric Ind Co Ltd | Sealed battery |
| JP2006351512A (en) * | 2005-05-16 | 2006-12-28 | Matsushita Electric Ind Co Ltd | Sealed secondary battery and its manufacturing method |
| US7875376B2 (en) | 2006-05-24 | 2011-01-25 | Eveready Battery Company, Inc. | Battery can having off-center C-shaped vent |
| US7572545B2 (en) | 2006-05-24 | 2009-08-11 | Everyready Battery Company, Inc. | Battery can having vent and asymmetric welded cover |
| US8158280B2 (en) | 2006-05-24 | 2012-04-17 | Eveready Battery Company, Inc. | Battery container having cruciform vent and cover |
| US8268468B2 (en) | 2006-05-24 | 2012-09-18 | Eveready Battery Company, Inc. | Battery can having off-center vent |
| EP1933403A3 (en) * | 2006-12-14 | 2008-07-30 | Samsung SDI Co., Ltd. | Secondary Battery |
| EP1933403A2 (en) * | 2006-12-14 | 2008-06-18 | Samsung SDI Co., Ltd. | Secondary Battery |
| US8273473B2 (en) | 2006-12-14 | 2012-09-25 | Samsung Sdi Co., Ltd. | Secondary battery having safety vent |
| JP2009170398A (en) * | 2007-12-20 | 2009-07-30 | Komatsulite Mfg Co Ltd | Safety device for battery |
| WO2009082958A1 (en) * | 2007-12-25 | 2009-07-09 | Byd Company Limited | Construction of electrochemical storage cell |
| EA017498B1 (en) * | 2007-12-25 | 2012-12-28 | Бид Компани Лимитед | Construction of electrochemical storage cell |
| CN105870393A (en) * | 2015-01-22 | 2016-08-17 | 松下能源(无锡)有限公司 | Insulating plate for battery and battery with insulating plate |
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|---|---|
| JP3853461B2 (en) | 2006-12-06 |
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