JP2001060454A - Sealing structure of explosion-proof secondary battery - Google Patents
Sealing structure of explosion-proof secondary batteryInfo
- Publication number
- JP2001060454A JP2001060454A JP11235968A JP23596899A JP2001060454A JP 2001060454 A JP2001060454 A JP 2001060454A JP 11235968 A JP11235968 A JP 11235968A JP 23596899 A JP23596899 A JP 23596899A JP 2001060454 A JP2001060454 A JP 2001060454A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- lead
- diaphragm plate
- internal pressure
- electrically connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、防爆形二次電池
の封口構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof secondary battery sealing structure.
【０００２】[0002]
【従来の技術】一般に二次電池は、充電中に充電器の異
常などで電池に充電電流が流れ続けると電池内部の温度
が上昇して発火したり、電池内部のガス圧の異常上昇で
電池の破裂に至る可能性があるため、防爆安全機構を備
えている。即ち、この防爆安全機構は、過充電などによ
り電池内部のガス圧が所定値以上に上昇した場合に、電
池内部の電流経路を遮断して温度上昇を初期の内に抑え
て電池の発火を防止するとともに、この圧力がさらに上
昇した場合にガス抜きを行い電池の爆発を防止するよう
になっている。2. Description of the Related Art Generally, when a charging current continues to flow through a battery during charging due to a malfunction of a charger or the like, the temperature inside the battery rises and the battery ignites, or the battery pressure rises due to an abnormal rise in gas pressure inside the battery. It is equipped with an explosion-proof safety mechanism, as it may lead to rupture. In other words, this explosion-proof safety mechanism prevents the battery from igniting by cutting off the current path inside the battery and suppressing the temperature rise within the initial period when the gas pressure inside the battery rises to a predetermined value or more due to overcharge or the like. When the pressure further rises, gas is vented to prevent the battery from exploding.
【０００３】この防爆安全機構は二次電池の封口部に組
み込まれており、その具体例は、図２の要部断面図に示
されている。即ち、図２に示した二次電池は、有底円筒
形の金属製電池ケース１と、この電池ケース１内に収装
された発電要素２と、電池ケース１の開口端に封口ガス
ケット３を介して固定されるとともに複数のガス抜き孔
（図示せず）が形成されてなる金属製端子板４と、発電
要素２に一端側が取り付けられ他端側が封口手段１０を
介して端子板４と電気的に接続されてなるリード５とか
ら構成されている。[0003] The explosion-proof safety mechanism is incorporated in a sealing portion of a secondary battery, and a specific example thereof is shown in a cross-sectional view of a main part of FIG. That is, the secondary battery shown in FIG. 2 includes a metal battery case 1 having a bottomed cylindrical shape, a power generation element 2 housed in the battery case 1, and a sealing gasket 3 at an open end of the battery case 1. And a metal terminal plate 4 having a plurality of gas vent holes (not shown) formed therein, and one end attached to the power generation element 2 and the other end connected to the terminal plate 4 via the sealing means 10. And a lead 5 which is electrically connected.
【０００４】前記封口手段１０は、端子板４の下方に配
設された金属製の感圧ダイヤフラム板６と、このダイヤ
フラム板６の下方に配設されたリード固定板７と、この
固定板７とダイヤフラム板６との周縁部間に積層された
絶縁性リング８とから主に構成されている。固定板７は
アルミニウム製の円板で、その複数箇所にガス抜き孔７
ａが形成されるとともに、発電要素２から延出するリー
ド５が固定板７の下面の任意の位置に溶接により接続さ
れている。また、周縁部の上面には絶縁性リング８が積
層され、ダイヤフラム板６の周縁部と固定板７の周縁部
とを電気的に絶縁している。ダイヤフラム板６は撓みや
すくて破断しやすいアルミニウム製の薄円板で、その中
央部には下方に突出した半球状の突部６ａが形成されて
おり、この突部６ａの下面は、固定板７の上面に局部的
に溶接され、この溶接点を介してのみリード５と端子板
４とが電気的に接続されている。そして、上述した固定
板７、絶縁性リング８、ダイヤフラム板６及び端子板４
は電池ケース１の開口端に封口ガスケット３を介してか
しめられている。The sealing means 10 includes a metal pressure-sensitive diaphragm plate 6 disposed below the terminal plate 4, a lead fixing plate 7 disposed below the diaphragm plate 6, and a fixing plate 7. And an insulating ring 8 laminated between the peripheral edges of the diaphragm plate 6. The fixing plate 7 is a disk made of aluminum and has gas vent holes 7 at a plurality of locations.
a is formed, and a lead 5 extending from the power generating element 2 is connected to an arbitrary position on the lower surface of the fixed plate 7 by welding. Further, an insulating ring 8 is laminated on the upper surface of the peripheral portion, and electrically insulates the peripheral portion of the diaphragm plate 6 from the peripheral portion of the fixed plate 7. The diaphragm plate 6 is an aluminum thin disk which is easily bent and broken and has a hemispherical protrusion 6a projecting downward at the center thereof. The lead 5 and the terminal plate 4 are electrically connected only through this welding point. Then, the above-mentioned fixing plate 7, insulating ring 8, diaphragm plate 6, and terminal plate 4
Is caulked to the open end of the battery case 1 via a sealing gasket 3.
【０００５】以上のように説明した封口手段１０を備え
た電池は、例えば過充電や短絡状態が進んで電池内部の
化学変化によりガスが発生・充満し、そのガスの充満に
より電池内の内圧が上昇し始めると、この内圧は固定板
７のガス抜き孔７ａを通ってダイヤフラム板６に直接作
用し、内圧の上昇によりダイヤフラム板６が外側へ膨ら
むように変形し、ダイヤフラム板６と固定板７との溶接
点が剥がれ、端子板４につながる充電または放電電流回
路が遮断される。[0005] In the battery provided with the sealing means 10 described above, for example, a gas is generated and filled by a chemical change inside the battery due to the progress of overcharge or short circuit, and the internal pressure in the battery is increased by the filling of the gas. When the internal pressure starts to rise, the internal pressure acts directly on the diaphragm plate 6 through the gas vent hole 7a of the fixing plate 7, and the diaphragm plate 6 is deformed so as to expand outward due to the increase of the internal pressure, so that the diaphragm plate 6 and the fixing plate 7 Is removed, and the charging or discharging current circuit connected to the terminal plate 4 is cut off.
【０００６】また、このように電流が遮断された後で
も、何らかの理由で電池内部でのガスの発生が続き、内
圧がさらに上昇した場合には、ダイヤフラム板６が大き
く変形してついには破断し、電池内のガスを端子板４の
ガス抜き孔（図示せず）を介して大気中に排気する。Further, even after the current is cut off, if gas continues to be generated inside the battery for some reason and the internal pressure further increases, the diaphragm plate 6 is greatly deformed and eventually breaks. Then, the gas in the battery is exhausted into the atmosphere through a gas vent hole (not shown) of the terminal plate 4.
【０００７】[0007]
【発明が解決しようとする課題】しかし、前述した封口
手段では、電流遮断機能を有するダイヤフラム板と固定
板との溶接点が、通常使用時の充放電に伴う電池内圧の
影響を直接受けることになるため、充放電が数多く繰り
返されると、その充放電にともなう１〜２ｋｇｆ／ｃｍ
２程度の内圧変化によって溶接点に機械的なストレスが
蓄積されてしまう。そして、ついにはこの溶接点が僅か
な内圧上昇にも耐えることができなくなり、通常使用時
において破断し、電流が遮断されて電池が使えなくなる
恐れがある。 また、溶接点は、電池内部の電解液にも
直接曝されることになるので、腐食されやすく、これに
よる溶接強度の劣化も生じる。However, in the above-mentioned sealing means, the welding point between the diaphragm plate having the current interrupting function and the fixed plate is directly affected by the internal pressure of the battery caused by charging and discharging during normal use. Therefore, if charge and discharge are repeated many times, 1-2 kgf / cm
The mechanical stress is accumulated at the welding point due to the internal pressure change of about two . Eventually, this welding point cannot withstand a slight increase in internal pressure, and may break during normal use, interrupting the current and making the battery unusable. Further, since the welding point is directly exposed to the electrolytic solution inside the battery, it is easily corroded, and the welding strength is also deteriorated.
【０００８】この発明は、以上のような従来の問題点に
鑑みなされたもので、その目的は、通常使用時の充放電
においても劣化することなく、長期にわたって良好な電
流遮断機能を有する信頼性の高い防爆形二次電池を提供
することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to improve reliability having a good current interruption function for a long period without deterioration even in charge and discharge during normal use. To provide a high explosion-proof secondary battery.
【０００９】[0009]
【課題を解決するための手段】前記目的を達成するた
め、この発明は、有底円筒形の金属製電池ケースと、こ
の電池ケース内に収装された発電要素と、この発電要素
から延出するリードと、前記電池ケースの開口端に封口
ガスケットを介して取付けられガス抜き孔が開口された
金属製端子板と、前記端子板と電気的に接続してその下
方に配設されるとともに前記電池ケースの開口端に前記
封口ガスケットを介して取付けられた封口手段とからな
り、前記封口手段は前記リードに電気的に接続されると
ともに前記ケース内のガス圧が所定以上に高まると前記
端子板と前記リードとを絶縁させ、さらにガス圧が異常
に高まるとそのガス圧を前記ケース外に解放するように
形成されてなる防爆形二次電池の封口構造において、◎
前記封口手段は、前記端子板の下方に配設されてかつ前
記端子板が電気的に接続された導電性の感圧ダイヤフラ
ム板と、この封口板の下方に中間絶縁体を介して適宜な
隙間を保って配設されてかつ下面に前記リードが電気的
に接続された導電性のリード固定板とからなり、前記ダ
イヤフラム板と前記固定板は前記封口ガスケットを介し
て前記ケースの開口部に固定されるとともに前記ダイヤ
フラム板の中央部のみで両者が電気的に接続されてお
り、◎前記固定板は、前記電池ケース内の内圧を受承し
てその内圧が直接前記ダイヤフラム板に加圧されないよ
うにするとともにその一部に所定の内圧にて破断する薄
肉部が形成されており、この薄肉部が破断すると、前記
内圧が前記ダイヤフラム板に伝えられるとともに前記ダ
イヤフラム板が上方に付勢されることで、前記ダイヤフ
ラム板が前記固定板から分離され、さらに所定の内圧で
前記ダイヤフラム板が破断するように形成されてなるこ
とを特徴とする防爆形二次電池の封口構造とした。In order to achieve the above object, the present invention relates to a metal battery case having a bottomed cylindrical shape, a power generation element housed in the battery case, and a power generation element extending from the power generation element. A metal terminal plate attached to the opening end of the battery case via a sealing gasket and having a gas vent hole opened, and electrically connected to the terminal plate and disposed therebelow. A sealing means attached to the open end of the battery case via the sealing gasket, wherein the sealing means is electrically connected to the lead and the terminal plate when the gas pressure in the case rises above a predetermined level. And the lead are insulated from each other, and when the gas pressure is abnormally increased, the gas pressure is released outside the case.
The sealing means includes a conductive pressure-sensitive diaphragm plate disposed below the terminal plate and electrically connected to the terminal plate, and an appropriate gap below the sealing plate via an intermediate insulator. And a conductive lead fixing plate electrically connected to the lead on the lower surface, and the diaphragm plate and the fixing plate are fixed to the opening of the case via the sealing gasket. At the same time, both are electrically connected only at the center of the diaphragm plate, and the fixing plate receives the internal pressure in the battery case so that the internal pressure is not directly applied to the diaphragm plate. And a thin portion which is broken at a predetermined internal pressure is formed in a part thereof. When the thin portion is broken, the internal pressure is transmitted to the diaphragm plate and the diaphragm plate is raised. By being urged, the diaphragm plate is separated from the fixed plate, and the diaphragm plate is formed so as to be broken at a predetermined internal pressure to form a sealing structure for an explosion-proof secondary battery. .
【００１０】[0010]
【発明の実施の形態】以下、この発明の好適な実施例を
添付図面に基づき詳述する。図１（ａ）にこの発明を適
用した封口構造の要部断面図を示すが、封口手段１０に
特徴を有する他は前述した従来技術と基本的に同じであ
る。よって以下の説明では、この封口手段１０以外の部
分についての説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1A is a cross-sectional view of a principal part of a sealing structure to which the present invention is applied. Therefore, in the following description, description of portions other than the sealing means 10 will be omitted.
【００１１】従来の封口手段１０では、電池内部におい
て異常に高まったガス圧をリード固定板７に設けられた
常開式のガス抜き孔７ａ（図２参照）を介して感圧ダイ
ヤフラム板６に伝えていたが、この実施例では前記固定
板７のガス抜き孔７ａを完全に塞ぐとともにこの塞いだ
部分を他の部分よりも薄い薄肉部７ｂとし、この薄肉部
７ｂ（防爆弁）が所定圧力以上の内圧で破断することに
よってその内圧を前記ダイヤフラム板６に伝えるように
している。In the conventional sealing means 10, an abnormally high gas pressure inside the battery is applied to the pressure-sensitive diaphragm plate 6 through a normally open gas vent hole 7 a (see FIG. 2) provided in the lead fixing plate 7. As described above, in this embodiment, the gas vent hole 7a of the fixing plate 7 is completely closed, and the closed portion is formed as a thin portion 7b thinner than the other portions, and the thin portion 7b (explosion-proof valve) has a predetermined pressure. The internal pressure is transmitted to the diaphragm plate 6 by breaking at the above internal pressure.
【００１２】前記固定板７はアルミニウム製の円板であ
りその厚さは０．３ｍｍである。この固定板７には、図
１（ｂ）の平面図に示すように、その中央部から放射状
（十字形）に矩形の薄肉部７ｂが４本形成されている。
この薄肉部７ｂは、その厚さが７０μｍ程度に設定され
ており、７〜８ｋｇｆ／ｃｍ２の内圧により破断される
ようになっている。なお、固定板７の材質およびその厚
さは前述したものに限らず、剛性が比較的強く導電性で
あるなどの条件を満たすものであればよい。また、薄肉
部７ｂの形状・寸法および本数は、固定板７の寸法およ
び材質を考慮して適宜設定されるのは勿論である。The fixing plate 7 is a disk made of aluminum and has a thickness of 0.3 mm. As shown in the plan view of FIG. 1B, the fixing plate 7 is formed with four rectangular thin portions 7b radially (cross-shaped) from the center.
The thickness of the thin portion 7b is set to about 70 μm, and the thin portion 7b is broken by an internal pressure of 7 to 8 kgf / cm 2 . The material and thickness of the fixing plate 7 are not limited to those described above, but may be any as long as they satisfy conditions such as relatively high rigidity and conductivity. The shape, size and number of the thin portions 7b are of course appropriately set in consideration of the size and material of the fixing plate 7.
【００１３】以上のように形成された固定板７は、その
下面にリード５が溶接接続されるとともにその上面に絶
縁性リング８を介してダイヤフラム板６が積層されてお
り、このダイヤフラム板６の中央部に下向きに設けられ
た突部６ａが固定板７の上面に局部的に溶接されること
で、リード５と端子板４とが電気的に接続されている。
ここで、ダイヤフラム板６の突部６ａと固定板７との溶
接強度は、前記固定板７に設けた薄肉部７ｂの破断強度
より小さく設定されている。The fixed plate 7 formed as described above has a lead 5 welded to the lower surface thereof and a diaphragm plate 6 laminated on the upper surface thereof via an insulating ring 8. The lead 5 and the terminal plate 4 are electrically connected to each other by locally projecting the projection 6 a provided downward at the center portion to the upper surface of the fixing plate 7.
Here, the welding strength between the projection 6a of the diaphragm plate 6 and the fixed plate 7 is set smaller than the breaking strength of the thin portion 7b provided on the fixed plate 7.
【００１４】つぎに、以上のように説明した封口手段１
０を備えた電池の動作説明をする。過充電や短絡状態が
進んで電池内部の化学変化によりガスが発生・充満し、
そのガスの充満により電池内の内圧が上昇し、その内圧
が７〜８ｋｇｆ／ｃｍ２を上回ると、固定板７に設けた
薄肉部７ｂが破断し、ここで初めてその内圧がダイヤフ
ラム板６に伝えられる。また、前述したようにダイヤフ
ラム板６と固定板７との溶接強度が薄肉部７ｂの破断強
度より小さく設定されているため、内圧を受けたダイヤ
フラム板６が上方に付勢されると同時にダイヤフラム板
６と固定板７との溶接点が確実に剥がされて、端子板４
につながる充電または放電電流回路が遮断される。ま
た、このように電流が遮断された後でも、何らかの理由
で電池内部でのガスの発生が続き、内圧がさらに上昇し
た場合には、ダイヤフラム板６が大きく変形してついに
は破断し、電池内のガスを端子板４のガス抜き孔（図示
せず）を介して大気中に排気する。Next, the sealing means 1 described above.
The operation of the battery provided with 0 will be described. Overcharging and short-circuiting progress, gas is generated and filled by chemical change inside the battery,
The internal pressure in the battery rises due to the filling of the gas, and when the internal pressure exceeds 7 to 8 kgf / cm 2 , the thin portion 7 b provided on the fixing plate 7 is broken, and the internal pressure is transmitted to the diaphragm plate 6 for the first time. Can be Further, as described above, since the welding strength between the diaphragm plate 6 and the fixed plate 7 is set to be smaller than the breaking strength of the thin portion 7b, the diaphragm plate 6 which has been subjected to the internal pressure is urged upward and at the same time. 6 and the fixing plate 7 are securely peeled off, and the terminal plate 4
The charging or discharging current circuit leading to is interrupted. Further, even after the current is cut off, the gas continues to be generated inside the battery for some reason, and when the internal pressure further increases, the diaphragm plate 6 is greatly deformed and finally breaks, and the inside of the battery is broken. Is exhausted into the atmosphere through gas vent holes (not shown) of the terminal plate 4.
【００１５】以上の構成の封口構造によれば、ダイヤフ
ラム板６と固定板７との溶接点が、通常使用時の充放電
に伴う電池内圧の影響を全く受けないため、充放電を数
多く繰り返しても、その充放電にともなう内圧変化によ
って溶接点が機械的なストレスを受けてその強度が劣化
されることはない。このことによって、工場出荷時に設
定された電流遮断特性が長期にわたって維持され、電池
の信頼性が向上する。According to the sealing structure having the above-described structure, the welding point between the diaphragm plate 6 and the fixed plate 7 is not affected by the internal pressure of the battery accompanying the charge and discharge during normal use. However, the strength does not deteriorate due to the mechanical stress applied to the welding point due to the change in the internal pressure due to the charging and discharging. As a result, the current interruption characteristics set at the time of shipment from the factory are maintained for a long time, and the reliability of the battery is improved.
【００１６】また通常使用時において、溶接点が電池内
部の電解液に直接曝されることがないので、腐食による
溶接強度の劣化を防止できる。In addition, during normal use, the welding point is not directly exposed to the electrolyte inside the battery, so that deterioration of welding strength due to corrosion can be prevented.
【００１７】なお、以上のように説明した実施例では、
ダイヤフラム板と固定板との電気的な接続を溶接により
行っているが、これに限らない。例えば、本実施例と同
様な形状でかつ弾性のあるダイヤフラム板を用意し、そ
の突部を固定板に圧接させることによって両者間の電気
的接続を行ってもよい。この場合、溶接によりダイヤフ
ラム板の突部と前記固定板とを直接接続する場合に比べ
て、組立工程及び工程管理が簡素化される。In the embodiment described above,
The electrical connection between the diaphragm plate and the fixed plate is made by welding, but is not limited to this. For example, an elastic diaphragm plate having the same shape as that of the present embodiment and having elasticity may be prepared, and the protrusions thereof may be pressed against the fixing plate to make an electrical connection therebetween. In this case, the assembling process and the process management are simplified as compared with a case where the projection of the diaphragm plate and the fixed plate are directly connected by welding.
【００１８】[0018]
【発明の効果】上記構成のこの発明によれば、封口手段
を構成するリード固定板に設けられる感圧ダイヤフラム
板への内圧の伝達手段を、常開式のガス抜き孔ではな
く、所定圧力以上の内圧が加わると破断する薄肉部（防
爆弁）としたので、ダイヤフラム板と固定板との電気的
接続点が、通常使用時の充放電に伴う電池内圧の影響を
全く受けない。このため、充放電を数多く繰り返して
も、その充放電にともなう内圧変化によって電気的接続
点が機械的なストレスを受けることはなく、工場出荷時
に設定された電流遮断特性を長期にわたって維持でき、
電池の信頼性が向上する。また、ダイヤフラム板と固定
板との電気的な接続を溶接により行った場合であって
も、その溶接点が通常使用時において電池内部の電解液
に直接曝されることがないので、腐食による溶接強度の
劣化を防止できる。According to the present invention having the above construction, the means for transmitting the internal pressure to the pressure-sensitive diaphragm plate provided on the lead fixing plate constituting the sealing means is not a normally open gas vent hole but a predetermined pressure or more. Since the thin portion (explosion-proof valve) breaks when the internal pressure is applied, the electrical connection point between the diaphragm plate and the fixed plate is not affected at all by the internal pressure of the battery due to charge and discharge during normal use. For this reason, even if charge and discharge are repeated many times, the electrical connection point does not receive mechanical stress due to the internal pressure change accompanying the charge and discharge, and the current interruption characteristics set at the time of shipment from the factory can be maintained for a long time,
The reliability of the battery is improved. Further, even when the electrical connection between the diaphragm plate and the fixed plate is made by welding, the welding point is not directly exposed to the electrolytic solution inside the battery during normal use, so that welding by corrosion is performed. Deterioration of strength can be prevented.
【図１】この発明の一実施例による防爆形二次電池の封
口構造であり、（ａ）はその要部断面図で、（ｂ）はリ
ード固定板の断面図および上方からみた平面図である。FIGS. 1A and 1B show a sealing structure of an explosion-proof secondary battery according to an embodiment of the present invention. FIG. 1A is a sectional view of a main part thereof, and FIG. 1B is a sectional view of a lead fixing plate and a plan view seen from above. is there.
【図２】従来の防爆形二次電池の封口構造の要部断面図
である。FIG. 2 is a cross-sectional view of a main part of a conventional explosion-proof secondary battery sealing structure.
１ 金属製電池ケース ２ 発電要素 ３ 封口ガスケット ４ 金属製端子板 ５ リード ６ 感圧ダイヤフラム板 ６ａ 突部 ７ リード固定板 ７ａ ガス抜き孔 ７ｂ 薄肉部（防爆弁） ８ 絶縁性リング １０ 封口手段 DESCRIPTION OF SYMBOLS 1 Metal battery case 2 Power generation element 3 Sealing gasket 4 Metal terminal plate 5 Lead 6 Pressure-sensitive diaphragm plate 6a Projection 7 Lead fixing plate 7a Gas vent hole 7b Thin part (explosion-proof valve) 8 Insulating ring 10 Sealing means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 足立 昌彦 東京都港区新橋５丁目36番11号 富士電気 化学株式会社内 Ｆターム(参考） 5H012 AA01 BB02 BB11 DD01 DD05 DD06 DD11 EE04 FF01 GG01 JJ02 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiko Adachi 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. F-term (reference) 5H012 AA01 BB02 BB11 DD01 DD05 DD06 DD11 EE04 FF01 GG01 JJ02
Claims (1)
電池ケース内に収装された発電要素と、この発電要素か
ら延出するリードと、前記電池ケースの開口端に封口ガ
スケットを介して取付けられガス抜き孔が開口された金
属製端子板と、前記端子板と電気的に接続してその下方
に配設されるとともに前記電池ケースの開口端に前記封
口ガスケットを介して取付けられた封口手段とからな
り、前記封口手段は前記リードに電気的に接続されると
ともに前記ケース内のガス圧が所定以上に高まると前記
端子板と前記リードとを絶縁させ、さらにガス圧が異常
に高まるとそのガス圧を前記ケース外に解放するように
形成されてなる防爆形二次電池の封口構造において、 前記封口手段は、前記端子板の下方に配設されてかつ前
記端子板が電気的に接続された導電性の感圧ダイヤフラ
ム板と、この封口板の下方に中間絶縁体を介して適宜な
隙間を保って配設されてかつ下面に前記リードが電気的
に接続された導電性のリード固定板とからなり、前記ダ
イヤフラム板と前記固定板は前記封口ガスケットを介し
て前記ケースの開口部に固定されるとともに前記ダイヤ
フラム板の中央部のみで両者が電気的に接続されてお
り、 前記固定板は、前記電池ケース内の内圧を受承してその
内圧が直接前記ダイヤフラム板に加圧されないようにす
るとともにその一部に所定の内圧にて破断する薄肉部が
形成されており、この薄肉部が破断すると、前記内圧が
前記ダイヤフラム板に伝えられるとともに前記ダイヤフ
ラム板が上方に付勢されることで、前記ダイヤフラム板
が前記固定板から分離され、さらに所定の内圧で前記ダ
イヤフラム板が破断するように形成されてなることを特
徴とする防爆形二次電池の封口構造。1. A metal battery case having a bottomed cylindrical shape, a power generating element housed in the battery case, a lead extending from the power generating element, and a sealing gasket provided at an open end of the battery case. A metal terminal plate having a gas vent hole opened and attached thereto, electrically connected to the terminal plate, disposed below the terminal plate, and attached to the open end of the battery case via the sealing gasket. The sealing means is electrically connected to the lead and insulates the terminal plate from the lead when the gas pressure in the case rises above a predetermined level, and further increases the gas pressure abnormally. And an explosion-proof secondary battery sealing structure formed so as to release the gas pressure outside the case, wherein the sealing means is disposed below the terminal plate and the terminal plate is electrically connected. Contact A conductive pressure-sensitive diaphragm plate, and a conductive lead fixedly disposed below the sealing plate with an appropriate gap interposed therebetween through an intermediate insulator and electrically connected to the lead on the lower surface. The diaphragm plate and the fixing plate are fixed to an opening of the case via the sealing gasket, and both are electrically connected only at a central portion of the diaphragm plate. Has a thin portion which receives an internal pressure in the battery case to prevent the internal pressure from being directly applied to the diaphragm plate, and has a thin portion which is broken at a predetermined internal pressure in a part thereof. Is broken, the internal pressure is transmitted to the diaphragm plate, and the diaphragm plate is urged upward, whereby the diaphragm plate is separated from the fixed plate, and Explosion-proof secondary battery of the sealing structure is in the internal pressure said diaphragm plate and characterized by being formed so as to break.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11235968A JP2001060454A (en) | 1999-08-23 | 1999-08-23 | Sealing structure of explosion-proof secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11235968A JP2001060454A (en) | 1999-08-23 | 1999-08-23 | Sealing structure of explosion-proof secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001060454A true JP2001060454A (en) | 2001-03-06 |
Family
ID=16993888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11235968A Pending JP2001060454A (en) | 1999-08-23 | 1999-08-23 | Sealing structure of explosion-proof secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001060454A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136608A (en) * | 2010-01-25 | 2011-07-27 | 日立车辆能源株式会社 | Sealed battery cell and method of producing the same |
| JP2013101889A (en) * | 2011-11-09 | 2013-05-23 | Toyota Motor Corp | Sealed battery and discharge method of the same |
| CN104868065A (en) * | 2014-02-20 | 2015-08-26 | 三星Sdi株式会社 | Cap assembly and secondary battery including the same |
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|---|---|---|---|---|
| JPH07105933A (en) * | 1993-10-06 | 1995-04-21 | Hitachi Maxell Ltd | Anti-explosive enclosed battery |
| JPH10199500A (en) * | 1997-01-10 | 1998-07-31 | Sony Corp | Battery |
| JPH10302744A (en) * | 1997-04-28 | 1998-11-13 | Matsushita Electric Ind Co Ltd | Explosion-proof sealing plate for sealed battery |
| JPH11273651A (en) * | 1998-03-25 | 1999-10-08 | Wako Denshi Kk | Safety device for secondary battery |
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1999
- 1999-08-23 JP JP11235968A patent/JP2001060454A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07105933A (en) * | 1993-10-06 | 1995-04-21 | Hitachi Maxell Ltd | Anti-explosive enclosed battery |
| JPH10199500A (en) * | 1997-01-10 | 1998-07-31 | Sony Corp | Battery |
| JPH10302744A (en) * | 1997-04-28 | 1998-11-13 | Matsushita Electric Ind Co Ltd | Explosion-proof sealing plate for sealed battery |
| JPH11273651A (en) * | 1998-03-25 | 1999-10-08 | Wako Denshi Kk | Safety device for secondary battery |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136608A (en) * | 2010-01-25 | 2011-07-27 | 日立车辆能源株式会社 | Sealed battery cell and method of producing the same |
| JP2011150966A (en) * | 2010-01-25 | 2011-08-04 | Hitachi Vehicle Energy Ltd | Sealed battery and method of manufacturing the same |
| US9287587B2 (en) | 2010-01-25 | 2016-03-15 | Hitachi Automotive Systems, Ltd. | Sealed battery cell and manufacturing method thereof |
| JP2013101889A (en) * | 2011-11-09 | 2013-05-23 | Toyota Motor Corp | Sealed battery and discharge method of the same |
| CN104868065A (en) * | 2014-02-20 | 2015-08-26 | 三星Sdi株式会社 | Cap assembly and secondary battery including the same |
| US11088429B2 (en) | 2014-02-20 | 2021-08-10 | Samsung Sdi Co., Ltd. | Cap assembly and secondary battery including the same |
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