JP3168892B2 - Explosion-proof sealing plate for secondary batteries - Google Patents
Explosion-proof sealing plate for secondary batteriesInfo
- Publication number
- JP3168892B2 JP3168892B2 JP31051995A JP31051995A JP3168892B2 JP 3168892 B2 JP3168892 B2 JP 3168892B2 JP 31051995 A JP31051995 A JP 31051995A JP 31051995 A JP31051995 A JP 31051995A JP 3168892 B2 JP3168892 B2 JP 3168892B2
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- explosion
- sealing plate
- metal plate
- insulating gasket
- 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.)
- Expired - Fee Related
Links
- 238000007789 sealing Methods 0.000 title claims description 27
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 238000004880 explosion Methods 0.000 claims description 5
- 239000008151 electrolyte solution Substances 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 description 9
- 238000003466 welding Methods 0.000 description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 230000007547 defect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910018871 CoO 2 Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電池の防爆安全性向
上に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving explosion-proof safety of a battery.
【０００２】[0002]
【従来の技術】近年、ＡＶ機器、パソコンなどの電池機
器のコードレス化、ポータブル化に伴いその駆動用電源
として、小型、軽量で高エネルギー密度の電池が求めら
れている。特にリチウム二次電池は高エネルギー密度を
有する電池であり、次世代電池の主力としておおいに期
待され、その潜在的市場規模も大きい。2. Description of the Related Art In recent years, as battery devices such as AV devices and personal computers have become cordless and portable, a small, lightweight and high energy density battery is required as a power source for driving the devices. In particular, a lithium secondary battery is a battery having a high energy density, is expected to be a mainstay of next-generation batteries, and has a large potential market size.
【０００３】ところが、密閉型電池、例えばリチウム金
属やカーボン材料を負極として使用するリチウム二次電
池は短絡、過充電、逆充電等の状態になると、電解液や
活物質の分解などにより電池内でガスが発生蓄積し、電
池内圧の上昇により電池が破裂してその機能を失った
り、周辺機器に損傷を与えることがあった。特に電池の
過充電状態が長時間継続すると、電池内圧が高まるとと
もに電池温度が急激に上昇し、電池の爆発を招く恐れが
あった。このような短絡、過充電、逆充電等の電池の爆
発を未然に防止するために、特開平６−１９６１３９号
公報には、図４に示すように電池内の圧力上昇に伴い変
形する導電性の弁体２と、所定の圧力になると破断して
開弁される薄板２ａとを備え、電池の内圧が上昇すると
弁体２の一部が破断され、電極内のガスは破断された弁
体を貫通して薄板を破断する。このため、電流を遮断し
た後に安全弁が開弁される防爆装置が提案されている。
また、封口板基本構造は次の通りである。電池内部と外
部端子とは、弁体３と導電性金属板６と中央部で溶着さ
れ電気的に接続されている。電池内に異常なガス発生が
起こった際、弁体３に圧力がかかり上方へ押し上げよう
とする。この力が溶着強度を上回った時溶着部が剥離す
る。さらに内圧が大きくなると弁体に設けた刻印が破断
する。これによって電池内のガスは外部に放出される。However, in a sealed battery, for example, a lithium secondary battery using lithium metal or carbon material as a negative electrode, when the battery is short-circuited, overcharged, or reversely charged, the electrolyte or the active material is decomposed in the battery. Gas was generated and accumulated, and the battery was ruptured due to an increase in the battery internal pressure, losing its function, and possibly damaging peripheral devices. In particular, when the overcharge state of the battery continues for a long time, the internal pressure of the battery increases and the battery temperature rises rapidly, which may cause an explosion of the battery. In order to prevent the explosion of the battery such as short circuit, overcharge, reverse charge, etc., Japanese Unexamined Patent Publication (Kokai) No. 6-196139 discloses a conductive material which is deformed as the pressure inside the battery increases as shown in FIG. And a thin plate 2a that is broken and opened when a predetermined pressure is reached. When the internal pressure of the battery increases, a part of the valve body 2 is broken and the gas in the electrode is broken. To break the thin plate. For this reason, there has been proposed an explosion-proof device in which a safety valve is opened after current is cut off.
The basic structure of the sealing plate is as follows. The inside of the battery and the external terminal are welded and electrically connected to the valve body 3 and the conductive metal plate 6 at the center. When abnormal gas generation occurs in the battery, pressure is applied to the valve body 3 to push it upward. When this force exceeds the welding strength, the welded portion peels off. When the internal pressure further increases, the mark provided on the valve body breaks. Thereby, the gas in the battery is released to the outside.
【０００４】[0004]
【発明が解決しようとする課題】この種の安全弁装置
は、弁体と導電性金属板との剥離強度が安定せず、電池
組立工程で溶着部が剥離し電池外部と電池内部の電気的
接触が断たれ、不良が多数発生する。また、所定の内圧
に達した際、溶着部が完全に剥離していないため弁が作
動したにもかかわらず弁体３と導電性金属板６との導通
状態が保たれ、短絡などの状態が続き発煙、発火に至る
という課題も有していた。In this type of safety valve device, the peel strength between the valve body and the conductive metal plate is not stable, and the welded portion peels off during the battery assembling process so that the electrical contact between the outside of the battery and the inside of the battery can be prevented. Is cut off and many defects occur. Further, when the internal pressure reaches a predetermined value, the conductive state between the valve body 3 and the conductive metal plate 6 is maintained even though the valve is operated because the welded portion is not completely peeled off. There was also a problem that smoke and fire continued.
【０００５】本発明は、このような課題を解決するもの
で、金属製防爆弁の短絡、過充電、逆充電により電池内
圧が上昇した場合でも防爆弁が所定の圧力で確実に動作
し電気的接続を遮断することにより電池の爆発を防ぎ、
また封口板組立工程での溶着部剥離による不良発生を防
ぐ、電池の安全性と信頼性を確保することのできる二次
電池用防爆封口板を提供するものである。[0005] The present invention solves the above problem, and even if the internal pressure of the battery rises due to short-circuiting, overcharging, or reverse charging of the metal explosion-proof valve, the explosion-proof valve operates reliably at a predetermined pressure, and the electrical explosion is prevented. Prevent battery explosion by disconnecting the connection,
Another object of the present invention is to provide an explosion-proof sealing plate for a secondary battery, which can prevent the occurrence of a defect due to a peeling of a welded portion in a sealing plate assembling step and can ensure the safety and reliability of a battery.
【０００６】[0006]
【課題を解決するための手段】これらの課題を解決する
ために、本発明は、前記防爆封口板に薄肉部を有する弁
体３と、ガス排出口を有する導電性金属板６と、前記弁
体と金属板との間に開口部を有する絶縁ガスケット４を
備え、前記弁体と金属板の一部は前記絶縁ガスケットの
開口部内で溶着されている。また、前記絶縁ガスケット
の一部に傾斜もしくは段差部を設けることにより、弁体
に波状を形成し波の山部３ａが前記絶縁ガスケットと接
触する弁体の上面よりも上方に位置し、弁体波形の谷部
は同接触面よりも下方に設けた。In order to solve these problems, the present invention provides a valve element 3 having a thin portion in the explosion-proof sealing plate, a conductive metal plate 6 having a gas outlet, and a valve. An insulating gasket 4 having an opening between the body and the metal plate is provided, and the valve body and a part of the metal plate are welded in the opening of the insulating gasket. Further, by providing a slope or a stepped portion in a part of the insulating gasket, a wave shape is formed on the valve body, and the wave crest 3a is located above the upper surface of the valve body that comes into contact with the insulating gasket, The corrugation valley was provided below the contact surface.
【０００７】[0007]
【発明の実施の形態】本発明では弁体を波状にし波の山
部と谷部の位置的な差を明確にすることにより、電池内
圧が所定の圧力値に達した際、前記弁体が的確に変形し
溶着部が離れて確実に金属板から剥離する。その結果、
前記弁体と前記導電性金属板との電気的接続は確実に遮
断される。電池内圧がさらに上昇すると、前記弁体に設
けた薄肉部が破断され電池内のガスは外部に放出され
る。さらに凸部を設けると波状が明確になる。さらに電
池組立行程での溶着部剥離による不良を防ぐことができ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the valve body is made wavy to clarify the positional difference between the peaks and valleys of the wave, so that when the internal pressure of the battery reaches a predetermined pressure value, the valve body is turned on. It is deformed accurately and the welded part is separated and surely peeled off from the metal plate. as a result,
Electrical connection between the valve body and the conductive metal plate is reliably cut off. When the internal pressure of the battery further increases, the thin portion provided on the valve body is broken, and the gas in the battery is released to the outside. Further, if a convex portion is provided, the wave shape becomes clear. Further, it is possible to prevent defects due to peeling of the welded portion in the battery assembly process.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面を参照しながら
説明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】（実施例１）図１は本発明封口板の側面断
面図である。本発明の防爆封口板は、開孔部を有する絶
縁ガスケット４の上部に配される弁体３の底面と前記導
電性金属板とが前記絶縁ガスケットの開孔部内で溶着部
５により電気的に接続されている。前記絶縁ガスケット
と前記弁体と前記弁体の上部に配されるＰＴＣ素子２と
前記ＰＴＣ素子の上部に配されるキャップ状端子１と凹
凸段差部を設けた導電性金属板６は、開孔部を有する金
属製ケース７に収納され、かしめ封口されている。(Embodiment 1) FIG. 1 is a side sectional view of a sealing plate of the present invention. In the explosion-proof sealing plate of the present invention, the bottom surface of the valve element 3 disposed above the insulating gasket 4 having the opening and the conductive metal plate are electrically connected to each other by the welding portion 5 in the opening of the insulating gasket. It is connected. The conductive metal plate 6 provided with the insulating gasket, the valve element, the PTC element 2 disposed on the upper part of the valve element, the cap-like terminal 1 disposed on the upper part of the PTC element, and the concavo-convex stepped part has an opening. It is housed in a metal case 7 having a portion, and is sealed by caulking.
【００１０】電池ケース内部には、金属箔集電体にＬｉ
ＣｏＯ2を主成分とするペーストを塗布、乾燥し短冊状
に切断した正極板と、カーボンをペースト状にして金属
箔集電体に塗布、乾燥し短冊状に切断した負極板とを、
フィルム状セパレーターを介して巻回した発電要素を内
蔵し、電池ケース開口部に、絶縁性樹脂からなるガスケ
ットを介して、前記防爆封口板はカシメ封口される。本
発明の防爆封口板は外部端子となるキャップ状端子１、
充電時や電池外部短絡時等に大電流が流れた場合これを
カットし、電池の安全性を確保するためのＰＴＣ素子、
及び、防爆機能のためにＣ形形状薄肉部を有し、さらに
は、波状になる様に金型プレスにて癖ずけが行われた弁
体３を、ポリプロピレン等の樹脂を略Ｌ字形で環状に成
形した絶縁性を有する絶縁ガスケット４内に積重載置す
ると共に、前記絶縁ガスケット４の底部（下部）に導電
性金属板６を配設し、前記弁体３の中央部付近で金属板
６と超音波溶接によって溶着し両者を電気的に接続し
た。これらを、通気孔を有し周縁に立ち上がり部を有す
る金属製ケース７に収納し、カシメ金型により内方に折
り曲げてカシメ密封（封口）する。[0010] Inside the battery case, a metal foil current collector contains Li.
A positive electrode plate coated with a paste containing CoO 2 as a main component, dried and cut into strips, and a negative electrode plate coated with carbon into a paste and applied to a metal foil current collector, dried and cut into strips,
The explosion-proof sealing plate is crimp-sealed at the opening of the battery case via a gasket made of an insulating resin, with a built-in power generating element wound through a film-like separator. The explosion-proof sealing plate of the present invention comprises a cap-shaped terminal 1 serving as an external terminal,
When a large current flows at the time of charging or external short circuit of the battery, etc., this is cut, and the PTC element for ensuring the safety of the battery,
Further, the valve body 3 having a C-shaped thin portion for an explosion-proof function, and further having a habit formed by a mold press so as to have a wavy shape, is formed by forming a resin such as polypropylene into a substantially L-shaped annular shape. And a conductive metal plate 6 is disposed at the bottom (lower portion) of the insulating gasket 4, and a metal plate is provided near the center of the valve body 3. 6 and were welded by ultrasonic welding, and both were electrically connected. These are housed in a metal case 7 having a ventilation hole and having a rising portion at a peripheral edge, and are bent inward with a crimping die to seal (sealing).
【００１１】また、前述の波状を有する弁体３、金属板
６、ＰＴＣ素子２との位置関係は、波状の山部８ａがＰ
ＴＣ素子の底面（弁体との接触面）よりも上方に、Ｂ寸
０ｍｍ、０．２ｍｍ、０．４ｍｍ、位置するように、ま
た、谷部は同接触面よりも下方に０．２ｍｍ位置し導電
性金属板６と溶接されるように、予め弁体３に波状を癖
ずけした。さらに詳しくは、防爆封口板に用いた弁体
は、外形φ１４ｍｍのアルミニウムの金属薄板にＣ型形
状刻印などを用いて弁体薄肉部を形成した弁体を用い、
弁体薄肉部の厚みを調整することで、弁体破断圧力（作
動圧）がほぼ２５ｋｇｆ／ｃｍ2になる様に設定した。
また、弁体３と導電性金属板６との溶着は溶着条件が設
定しやすく使いがっての良い超音波溶接を用い、超音波
振動子に接続されたホーンの先端荷重を最適に調整し超
音波振動（４０ｋＨｚ）を印加して溶接した。ここで、
導電性金属板６、金属製ケース７も弁体と同様に材質は
電解液に対する耐食性の良いアルミニウムを用いた。The positional relationship between the valve element 3, the metal plate 6, and the PTC element 2 having the wavy shape is such that the wavy crest 8a is
The B dimension is located at 0 mm, 0.2 mm, 0.4 mm above the bottom surface (contact surface with the valve element) of the TC element, and the valley is located 0.2 mm below the contact surface. The valve body 3 was previously waved so as to be welded to the conductive metal plate 6. More specifically, the valve body used for the explosion-proof sealing plate uses a valve body in which a valve body thin portion is formed using a C-shaped engraving on an aluminum thin metal sheet having an outer diameter of 14 mm,
By adjusting the thickness of the thin portion of the valve body, the valve body breaking pressure (operating pressure) was set to be approximately 25 kgf / cm 2 .
In addition, the welding between the valve body 3 and the conductive metal plate 6 is performed by using ultrasonic welding which is easy to set welding conditions and is easy to use, and optimally adjusts the tip load of the horn connected to the ultrasonic vibrator. Ultrasonic vibration (40 kHz) was applied for welding. here,
The conductive metal plate 6 and the metal case 7 were made of aluminum having good corrosion resistance to the electrolytic solution, similarly to the valve body.
【００１２】（比較例１）図３に示すように、実施例１
で用いた弁体３の山部をなくし、谷部を前記ＰＴＣの底
面と弁体との接触面よりも下部に０．２ｍｍの位置に有
するようにした。Comparative Example 1 As shown in FIG.
The peaks of the valve body 3 used in the above were eliminated, and the valleys were provided at a position of 0.2 mm below the contact surface between the bottom surface of the PTC and the valve body.
【００１３】（比較例２）図４に示すように、実施例１
で用いた弁体３の山部、谷部を設けない構造とした。Comparative Example 2 As shown in FIG.
The valve body 3 used in the above was configured to have no peaks and valleys.
【００１４】本発明者等は、このような封口板を用いた
電池の内圧上昇時における電気的接続部の遮断動作圧を
測定した。その結果を（表１）に示す。また、実際に本
発明の封口板を用いた電池を各３００個試作して、耐漏
液試験、高温保存試験、落下試験を行い、不良品の発生
する状態をテストした。その結果を（表２）に示してい
る。ただし表２は下記の条件で測定した。The present inventors measured the breaking operation pressure of the electrical connection when the internal pressure of a battery using such a sealing plate was increased. The results are shown in (Table 1). In addition, 300 batteries each using the sealing plate of the present invention were actually manufactured, and a leak resistance test, a high-temperature storage test, and a drop test were performed to test a state in which defective products were generated. The results are shown in (Table 2). However, Table 2 was measured under the following conditions.
【００１５】（１）ヒートサイクル試験は、−１０度〜
６０度を１６ｈ／１サイクルとして２０サイクル行っ
た。(1) The heat cycle test is performed at -10 degrees to
Twenty cycles were performed with 60 degrees as 16h / 1 cycle.
【００１６】（２）落下試験は、７５ｃｍの高さからコ
ンクリート上に電池を上部、底部、側面部の３方向から
各５回ずつ落下させて、弁体と金属板との外れを観察し
た。(2) In the drop test, the battery was dropped on concrete from a height of 75 cm five times each in three directions of the top, bottom, and side surfaces, and the detachment of the valve body and the metal plate was observed.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】（実施例２）実施例１において、弁体３に
波状の癖ずけを金型プレスにより行ったが、絶縁ガスケ
ット４の成形時に予め段差部４ａを設け弁体に波状が形
成される様に構成した。図２（Ａ）に実施例封口板側面
図を、図２（Ｂ）に一部拡大図を示した。４ａ段差部Ａ
寸を、０．４ｍｍ、０．８ｍｍで絶縁ガスケット４を成
形し実施例１と同様に電池評価テストを実施した。表２
に本発明実施例１、２のテスト結果を示した。テスト結
果より明らかな様に、本発明（実施例１、２）防爆封口
板は弁体剥離作動圧バラツキを極めて小さくすること
で、電池の安全性、信頼性を大きく向上させ、また、実
使用においても弁体３と金属板６の溶接ハズレによるト
ラブルや工程内での不良を大幅に解消することができ
た。(Embodiment 2) In Embodiment 1, corrugations were formed on the valve body 3 by die pressing. However, when the insulating gasket 4 was formed, a stepped portion 4a was provided in advance to form a corrugation on the valve body. It was configured so that FIG. 2A shows a side view of the sealing plate of the embodiment, and FIG. 2B shows a partially enlarged view. 4a Step A
The insulating gasket 4 was formed with dimensions of 0.4 mm and 0.8 mm, and a battery evaluation test was performed in the same manner as in Example 1. Table 2
The test results of Examples 1 and 2 of the present invention are shown in FIG. As is evident from the test results, the explosion-proof sealing plate of the present invention (Examples 1 and 2) greatly improves the safety and reliability of the battery by minimizing the variation in the operating pressure of the valve body peeling. In this case, the trouble caused by welding loss of the valve body 3 and the metal plate 6 and the defect in the process could be largely eliminated.
【００２０】[0020]
【発明の効果】以上のように、本発明は電池内の所定の
圧力が作用すると破断する薄肉部を有し、かつ、波状弁
体を用い、さらに波状弁体の山部と谷部の差を明確にす
るために、絶縁ガスケットの弁体と接触する面に傾斜も
しくは段差を設けたものである。As described above, the present invention has a thin portion which breaks when a predetermined pressure in the battery is applied, uses a corrugated valve, and further comprises a difference between a peak and a valley of the corrugated valve. In order to clarify the above, the surface of the insulating gasket which comes into contact with the valve body is provided with a slope or a step.
【００２１】弁体を波状にし波の山部と谷部の位置的な
差を明確にすることにより、電池内圧が所定の圧力値に
達した際、前記弁体が的確に変形し溶着部が離れて確実
に金属板から剥離する。その結果、前記弁体と前記導電
性金属板との電気的接続は確実に遮断される。電池内圧
がさらに上昇すると、前記弁体に設けた薄肉部が破断さ
れ電池内のガスは外部に放出される。When the internal pressure of the battery reaches a predetermined pressure value, the valve element is accurately deformed and the welded portion is formed by making the valve element wavy and clarifying the positional difference between the peak and the valley of the wave. Peel away from the metal plate reliably. As a result, the electrical connection between the valve body and the conductive metal plate is reliably cut off. When the internal pressure of the battery further increases, the thin portion provided on the valve body is broken, and the gas in the battery is released to the outside.
【図１】本発明のリチウム二次電池用防爆封口板（段差
なし）の側面断面図FIG. 1 is a side sectional view of an explosion-proof sealing plate for a lithium secondary battery (without steps) of the present invention.
【図２】（Ａ） 本発明のリチウム二次電池用防爆封口
板の側面断面図 （Ｂ） 本発明のリチウム二次電池用防爆封口板の要部
側面断面拡大図2A is a side cross-sectional view of an explosion-proof sealing plate for a lithium secondary battery of the present invention. FIG. 2B is an enlarged side cross-sectional view of a main part of the explosion-proof sealing plate for a lithium secondary battery of the present invention.
【図３】従来のリチウム二次電池用防爆封口板の側面断
面図FIG. 3 is a side sectional view of a conventional explosion-proof sealing plate for a lithium secondary battery.
【図４】従来のリチウム二次電池用防爆封口板の側面断
面図FIG. 4 is a side sectional view of a conventional explosion-proof sealing plate for a lithium secondary battery.
【図５】従来のリチウム二次電池用防爆封口板の１例の
側面断面図FIG. 5 is a side sectional view of an example of a conventional explosion-proof sealing plate for a lithium secondary battery.
１ キャップ状端子 ２ ＰＴＣ素子 ３ 弁体 ３ａ 弁体山部 ３ｂ 弁体谷部 ３ｃ 弁体薄肉部 ４ 絶縁ガスケット ４ａ 絶縁ガスケット段差部 ５ 溶着点 ６ 導電性金属板 ７ 金属製ケース DESCRIPTION OF SYMBOLS 1 Cap-shaped terminal 2 PTC element 3 Valve body 3a Valve body peak part 3b Valve body valley part 3c Valve body thin part 4 Insulating gasket 4a Insulating gasket step part 5 Welding point 6 Conductive metal plate 7 Metal case
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松久 一朗 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 石田 佳子 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 平６−215747（ＪＰ，Ａ) 特開 平６−196150（ＪＰ，Ａ) 特開 平８−315798（ＪＰ，Ａ) 特開 平５−335011（ＪＰ，Ａ) 特開 平９−134715（ＪＰ，Ａ) 特開 平７−254402（ＪＰ，Ａ) 特開 平８−339792（ＪＰ，Ａ) 特開 平９−17415（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 2/12 101 H01M 2/08 H01M 2/34 H01M 10/40 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Ichiro Matsuhisa 1006 Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Yoshiko Ishida 1006 Kadoma, Kazuma, Kadoma, Osaka Pref. (56) References JP-A-6-215747 (JP, A) JP-A-6-196150 (JP, A) JP-A-8-315798 (JP, A) JP-A-5-335011 (JP, A) JP-A-9-134715 (JP, A) JP-A-7-254402 (JP, A) JP-A-8-339792 (JP, A) JP-A-9-17415 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H01M 2/12 101 H01M 2/08 H01M 2/34 H01M 10/40
Claims (4)
巻回して構成した極板群と、電解液を備えた円筒形電池
の封口板であり、この封口板は薄肉部を有する弁体３
と、ガス排出口を有する導電性金属板６と、前記弁体と
金属板との間に配されて開口部を有する絶縁ガスケット
４を備え、前記弁体の一部と金属板の一部を前記絶縁ガ
スケット４の開口部内で溶着し、前記絶縁ガスケット４
と接触する弁体３の上面を、前記弁体３と金属板６との
溶着部より上方に位置させるとともに、前記弁体３を波
状にし、弁体の波の山部が絶縁ガスケットと接触する弁
体面より上方に位置し、谷部が同接触する弁体面より下
方に位置するように形成して、電池内圧が所定の圧力値
に達すると前記弁体３が上方に反転し前記弁体３と金属
板６との電気的接続を遮断する二次電池用防爆封口板。1. An electrode plate group comprising a positive electrode plate and a negative electrode plate wound around a separator, and a sealing plate for a cylindrical battery provided with an electrolytic solution. The sealing plate is a valve body 3 having a thin portion.
A conductive metal plate 6 having a gas discharge port, an insulating gasket 4 having an opening disposed between the valve body and the metal plate, and a part of the valve body and a part of the metal plate. The insulating gasket 4 is welded in the opening of the insulating gasket 4,
The upper surface of the valve body 3 that comes into contact with the valve body 3 is positioned above the welded portion between the valve body 3 and the metal plate 6 and the valve body 3 is corrugated.
To Jo, valves crests of the waves of the valve body is in contact with the insulating gasket
Located above the body surface and below the valve body surface where the valleys make contact
Explosion proof for a secondary battery , in which when the internal pressure of the battery reaches a predetermined pressure value, the valve body 3 reverses upward to cut off the electrical connection between the valve body 3 and the metal plate 6. Sealing plate.
部に傾斜状もしくは段差状の凸部を設けて波状にすると
ともに波の山部３ａが前記絶縁ガスケットと接触する弁
体の上面よりも上方に位置し、弁体と金属板との溶着部
は前記弁体の上面よりも下方に位置させた請求項１記載
の二次電池用防爆封口板。2. A part of a surface of the insulating gasket that comes into contact with the valve body is provided with an inclined or stepped convex portion to make it wavy, and a wave peak 3a is formed from the upper surface of the valve body that comes into contact with the insulating gasket. 2. The explosion-proof sealing plate for a secondary battery according to claim 1, wherein the welded portion between the valve body and the metal plate is located below the upper surface of the valve body.
１記載の二次電池用防爆封口板。3. The explosion-proof sealing plate for a secondary battery according to claim 1, wherein a C-shaped thin portion is provided on the valve body.
前記ＰＴＣ素子２の上部にキャップ状端子１が配される
請求項１記載の二次電池用防爆封口板。4. A PTC element 2 is arranged above the valve body.
The explosion-proof sealing plate for a secondary battery according to claim 1, wherein a cap-shaped terminal (1) is disposed on the upper part of the PTC element (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31051995A JP3168892B2 (en) | 1995-11-29 | 1995-11-29 | Explosion-proof sealing plate for secondary batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31051995A JP3168892B2 (en) | 1995-11-29 | 1995-11-29 | Explosion-proof sealing plate for secondary batteries |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09147821A JPH09147821A (en) | 1997-06-06 |
| JP3168892B2 true JP3168892B2 (en) | 2001-05-21 |
Family
ID=18006213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31051995A Expired - Fee Related JP3168892B2 (en) | 1995-11-29 | 1995-11-29 | Explosion-proof sealing plate for secondary batteries |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3168892B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3378147B2 (en) * | 1996-06-28 | 2003-02-17 | 松下電器産業株式会社 | Method of manufacturing explosion-proof sealing plate for sealed battery |
| KR20010089144A (en) * | 2000-03-09 | 2001-09-29 | 다카노 야스아키 | Cell safety valve and method for manufacturing the same |
| JP4303938B2 (en) * | 2002-10-31 | 2009-07-29 | Ｆｄｋ株式会社 | Cylindrical battery |
| KR100578804B1 (en) | 2004-03-29 | 2006-05-11 | 삼성에스디아이 주식회사 | Cap assembly and secondary battery having same |
| CN107431178B (en) | 2015-03-27 | 2020-08-11 | 三洋电机株式会社 | Cylindrical battery |
| EP3477733A1 (en) * | 2016-07-29 | 2019-05-01 | BYD Company Limited | Explosion-proof valve, cover plate assembly, and battery |
| CN110945686B (en) * | 2017-07-31 | 2022-11-18 | 松下知识产权经营株式会社 | Cylindrical battery |
| CN109920959B (en) * | 2017-12-13 | 2024-09-13 | 比亚迪股份有限公司 | Current interruption device and overturning piece, battery cover plate assembly, single battery, battery module, power battery and electric automobile thereof |
| CN110504401B (en) * | 2019-09-20 | 2024-09-27 | 深圳市比克动力电池有限公司 | Lithium ion battery and battery module with high security performance |
| CN111403648B (en) * | 2020-03-25 | 2020-12-29 | 金华市小狸新材料科技有限责任公司 | New energy explosion-proof lithium battery and use method thereof |
| CN114678651B (en) * | 2022-04-14 | 2024-04-19 | 北京科易动力科技有限公司 | Explosion-proof valve and battery pack with same |
| CN114744361B (en) * | 2022-04-14 | 2024-04-19 | 北京科易动力科技有限公司 | Ejector pin type explosion-proof valve and battery pack with same |
-
1995
- 1995-11-29 JP JP31051995A patent/JP3168892B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09147821A (en) | 1997-06-06 |
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