JPH08153508A - Explosionproof battery - Google Patents
Explosionproof batteryInfo
- Publication number
- JPH08153508A JPH08153508A JP6292550A JP29255094A JPH08153508A JP H08153508 A JPH08153508 A JP H08153508A JP 6292550 A JP6292550 A JP 6292550A JP 29255094 A JP29255094 A JP 29255094A JP H08153508 A JPH08153508 A JP H08153508A
- Authority
- JP
- Japan
- Prior art keywords
- vent hole
- sealing plate
- gas vent
- tab
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/317—Re-sealable arrangements
- H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
-
- 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]
【産業上の利用分野】本発明は防爆機能付き電池に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof battery.
【０００２】[0002]
【従来の技術】ノート型パソコン、ビデオカメラ、移動
式電話などの携帯用電子機器の需要が増加している。こ
れらの携帯用電子機器の電源としては、ニッケルカドミ
ウム二次電池やニッケル水素二次電池などのアルカリ二
次電池、リチウムイオン二次電池、ニッケル亜鉛二次電
池、アルカリ電池、リチウム電池が用いられている。2. Description of the Related Art Demand for portable electronic devices such as laptop computers, video cameras and mobile phones is increasing. As power sources for these portable electronic devices, alkaline secondary batteries such as nickel-cadmium secondary batteries and nickel-hydrogen secondary batteries, lithium-ion secondary batteries, nickel-zinc secondary batteries, alkaline batteries, lithium batteries are used. There is.
【０００３】しかしながら、前記二次電池の場合には過
充電により、また、前記一次電池の場合には過放電や誤
充電により電池内部にガスが発生し、これにより電池内
圧が上昇するため、封口板が吹き飛ぶ、つまり破裂を生
じるという問題点があった。However, gas is generated inside the battery due to overcharge in the case of the secondary battery, and overdischarge or erroneous charge in the case of the primary battery, which increases the internal pressure of the battery. There was a problem that the board blows off, that is, it bursts.
【０００４】このようなことからこれらの電池には、ガ
ス発生により電池内圧が上昇した際にガスを外部に放出
させるための安全弁が設けられている。前記安全弁を備
えた電池としては、例えば図３に示す構造を有するもの
が知られている。正極２１は、負極２２との間にセパレ
ータ２３を介在してスパイラル状に捲回され、有底円筒
状の容器２４内に収納されている。電解液は、前記容器
２４内に収容されている。防爆機能及び正極端子を兼ね
る封口部材２５は、前記容器２４の上部開口部に配置さ
れている。前記封口部材２５は中央に円形のガス抜き孔
２６を有する円形の封口板２７と、安全弁としての弾性
材料からなる弾性弁体２８と、ガス抜き孔２９が開口さ
れた帽子形状の端子キャップ３０とから構成されてい
る。前記弾性弁体２８は前記封口板２７にそのガス抜き
孔２６を覆うように載置されている。前記端子キャップ
３０は前記弾性弁体２８を包囲するように配置され、溶
接により前記封口板２７に固定されている。リング状の
絶縁性ガスケット３１は、前記封口板２７の周縁と前記
容器２４の上部開口部内面の間に配置され、前記上部開
口部を内側に縮径するカシメ加工により前記容器２４に
前記封口部材２５を気密に固定している。リードタブの
リード（図示しない）は前記正極２１に取り付けられて
いる。前記リードタブのタブ３２は、前記封口板２７の
下面に中央付近が前記ガス抜き孔２６の下方を通過する
ように取付けられている。前記リードタブは例えばニッ
ケルから形成されている。For these reasons, these batteries are provided with a safety valve for releasing the gas to the outside when the internal pressure of the battery rises due to the generation of gas. As a battery provided with the safety valve, for example, one having a structure shown in FIG. 3 is known. The positive electrode 21 is spirally wound with the separator 23 interposed between the positive electrode 21 and the negative electrode 22, and is housed in a bottomed cylindrical container 24. The electrolytic solution is contained in the container 24. A sealing member 25 having an explosion-proof function and a positive electrode terminal is arranged in the upper opening of the container 24. The sealing member 25 includes a circular sealing plate 27 having a circular gas vent hole 26 in the center, an elastic valve body 28 made of an elastic material as a safety valve, and a cap-shaped terminal cap 30 having a gas vent hole 29. It consists of The elastic valve body 28 is mounted on the sealing plate 27 so as to cover the gas vent hole 26. The terminal cap 30 is arranged so as to surround the elastic valve body 28, and is fixed to the sealing plate 27 by welding. The ring-shaped insulating gasket 31 is disposed between the peripheral edge of the sealing plate 27 and the inner surface of the upper opening of the container 24, and the sealing member is attached to the container 24 by caulking to reduce the diameter of the upper opening inward. 25 is fixed airtightly. The lead (not shown) of the lead tab is attached to the positive electrode 21. The tab 32 of the lead tab is attached to the lower surface of the sealing plate 27 so that the vicinity of the center passes below the gas vent hole 26. The lead tab is made of nickel, for example.
【０００５】このような構成の電池において、前記電池
内にガスが発生し、ガス圧力が前記封口板２７の前記ガ
ス抜き孔２６を通して前記弾性弁体２８に加わると、前
記弾性弁体２８は変形して持ち上げられるため、前記封
口板２７との間に隙間が生じる。その結果、前記ガスが
前記隙間及び前記ガス抜き孔２９から外部へ逃散するた
め、破裂を防止することができる。In the battery having such a structure, when gas is generated in the battery and gas pressure is applied to the elastic valve body 28 through the gas vent hole 26 of the sealing plate 27, the elastic valve body 28 is deformed. Therefore, a gap is formed between the sealing plate 27 and the sealing plate 27. As a result, the gas escapes from the gap and the gas vent hole 29 to the outside, so that the burst can be prevented.
【０００６】ところで、前述した安全弁を備えた電池は
前記リードタブで前記正極２１と前記封口部材２５との
導通を確保することにより前記封口部材２５を正極端子
として用いる構造になっている。前記タブ３２の幅が狭
すぎると導通が低下して電池性能が劣るため、前記タブ
３２の幅は前記封口板２７の前記ガス抜き孔２６の径よ
りも大きくなっている。しかしながら、ユーザが前記電
池を誤って火中に投入することにより前記電池内の温度
が極めて高温になり、前記電池内にガスが発生し、ガス
圧力が急激に上昇すると、前記ガス圧力により前記タブ
３２が前記封口板２７の下面に押し付けられて前記ガス
抜き孔２６を塞ぐため、前記安全弁が作動せず、破裂を
生じるという問題点があった。また、ユーザが前記電池
を誤って落下させ、この時に前記電極群が前記封口板２
７に向かって移動されて前記タブ３２を前記封口板２７
に押付けると、前記タブ３２が折れ曲がって前記封口板
２７の前記ガス抜き孔２６に挿入されるため、前記ガス
抜き孔２６が塞がれる。このような状態の電池において
例えば過充電、過放電等によりガスが発生すると、破裂
を生じるという問題点があった。By the way, the battery provided with the above-mentioned safety valve has a structure in which the sealing member 25 is used as a positive electrode terminal by ensuring conduction between the positive electrode 21 and the sealing member 25 by the lead tab. If the width of the tab 32 is too narrow, the conduction is lowered and the battery performance is deteriorated. Therefore, the width of the tab 32 is larger than the diameter of the gas vent hole 26 of the sealing plate 27. However, when the user mistakenly throws the battery into a fire, the temperature inside the battery becomes extremely high, gas is generated in the battery, and the gas pressure rises sharply. Since 32 is pressed against the lower surface of the sealing plate 27 to close the gas vent hole 26, there is a problem that the safety valve does not operate and bursts. In addition, the user accidentally drops the battery, and at this time, the electrode group is closed by the sealing plate 2.
7 to move the tab 32 to the sealing plate 27.
When pressed against, the tab 32 bends and is inserted into the gas vent hole 26 of the sealing plate 27, so that the gas vent hole 26 is closed. In a battery in such a state, when gas is generated due to overcharging, overdischarging, etc., there is a problem that the battery bursts.
【０００７】[0007]
【発明が解決しようとする課題】本発明の目的は、ユー
ザの誤使用による破裂が防止された防爆機能付き電池を
提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a battery with an explosion-proof function, which is prevented from bursting due to misuse by a user.
【０００８】[0008]
【課題を解決するための手段】本発明に係わる防爆機能
付き電池は、容器内に収納され、かつ正極と負極との間
にセパレータを介装して作製された電極群と、前記容器
の開口部に取付けられたガス抜き孔を有する封口板と、
前記封口板に前記ガス抜き孔を囲むように取付けられた
端子と、前記封口板と前記端子との間に前記ガス抜き孔
を塞ぐように配置された安全弁と、一端が前記正極もし
くは前記負極に取付けられ、かつ他端が前記封口板の下
面に取付けられ、前記封口板の前記ガス抜き孔に対向す
る位置に孔が開口された帯状のリードとを備えたことを
特徴とするものである。The battery with explosion-proof function according to the present invention comprises an electrode group which is housed in a container and is made by interposing a separator between a positive electrode and a negative electrode, and an opening of the container. A sealing plate having a gas vent hole attached to the section,
A terminal attached to the sealing plate so as to surround the gas vent hole, a safety valve arranged so as to close the gas vent hole between the sealing plate and the terminal, and one end of the positive electrode or the negative electrode. And a strip-shaped lead having a hole opened at a position facing the gas vent hole of the sealing plate, the other end being attached to the lower surface of the sealing plate.
【０００９】本発明に係る防爆機能付き電池の一例を図
１及び図２を参照して詳細に説明する。正極１は、負極
２との間にセパレータ３を介在してスパイラル状に捲回
されて有底円筒状の容器４内に収納されている。前記負
極２は作製された電極群の最外周に配置されて前記容器
４と電気的に接触している。電解液は、前記容器４内に
収容されている。防爆機能及び端子（例えば正極端子）
を兼ねる封口部材５は、前記容器４の上部開口部に配置
されている。前記封口部材５は、例えば中央に円形のガ
ス抜き孔６を有する円形の封口板７と、安全弁としての
例えば合成ゴムからなる弾性弁体８と、ガス抜き孔９が
開口された帽子形状の端子キャップ１０とから構成され
ている。前記弾性弁体８は前記封口板７にそのガス抜き
孔６を覆うように載置されている。前記端子キャップ１
０は前記弾性弁体８を包囲するように配置され、溶接に
より前記封口板７に固定されている。リング状の絶縁性
ガスケット１１は、前記封口板７の周縁と前記容器４の
上部開口部内面の間に配置され、前記上部開口部を内側
に縮径するカシメ加工により前記容器４に前記封口部材
５を気密に固定している。帯状リードとしてのリードタ
ブ１２は、例えばニッケルや、ニッケルメッキ鋼板から
形成されている。前記リードタブ１２のタブ１３は、前
記前記封口板７の下面に中央付近が前記ガス抜き孔６の
下方を通過するように取付けられており、かつ前記ガス
抜き孔６と対向する位置に孔１４を有する。前記孔１４
は、例えば図２に示すように矩形状をなす。また、前記
リードタブ１２のリード１５は、例えば前記正極１の長
手方向に沿う一方側の端部に取付けられている。An example of the battery with explosion-proof function according to the present invention will be described in detail with reference to FIGS. 1 and 2. The positive electrode 1 is spirally wound with the separator 3 interposed between the positive electrode 1 and the negative electrode 2 and is housed in a bottomed cylindrical container 4. The negative electrode 2 is arranged on the outermost periphery of the prepared electrode group and is in electrical contact with the container 4. The electrolytic solution is contained in the container 4. Explosion-proof function and terminal (eg positive terminal)
The sealing member 5, which also serves as the sealing member, is arranged in the upper opening of the container 4. The sealing member 5 is, for example, a circular sealing plate 7 having a circular gas vent hole 6 in the center, an elastic valve body 8 made of, for example, synthetic rubber as a safety valve, and a hat-shaped terminal having a gas vent hole 9 opened. It is composed of a cap 10. The elastic valve body 8 is placed on the sealing plate 7 so as to cover the gas vent hole 6. The terminal cap 1
0 is arranged so as to surround the elastic valve body 8 and is fixed to the sealing plate 7 by welding. The ring-shaped insulating gasket 11 is disposed between the peripheral edge of the sealing plate 7 and the inner surface of the upper opening of the container 4, and the sealing member is attached to the container 4 by caulking to reduce the diameter of the upper opening inward. 5 is fixed airtightly. The lead tab 12 as a strip-shaped lead is made of, for example, nickel or a nickel-plated steel plate. The tab 13 of the lead tab 12 is attached to the lower surface of the sealing plate 7 so that the vicinity of the center passes below the gas vent hole 6, and a hole 14 is provided at a position facing the gas vent hole 6. Have. The hole 14
Has a rectangular shape as shown in FIG. 2, for example. The lead 15 of the lead tab 12 is attached to, for example, one end of the positive electrode 1 along the longitudinal direction.
【００１０】前記孔１４のタブ１３の幅方向に隣接する
非開孔領域の幅（Ｌ1 ）は、前記封口板７の前記ガス抜
き孔６の径の９０％以下に相当する長さにすることが好
ましい。前記幅Ｌ1 を前記封口板７の前記ガス抜き孔６
の径の９０％を越える長さにすると、ガス圧力の急激な
上昇により前記非開孔領域が前記ガス抜き孔６に押付け
られた際か、または前記電池の落下により折れ曲がった
タブ１３の前記非開孔領域が前記ガス抜き孔６に挿入さ
れた際に、前記非開孔領域により前記ガス抜き孔６が塞
がれる恐れがある。The width (L 1 ) of the non-opening region adjacent to the width direction of the tab 13 of the hole 14 is set to a length corresponding to 90% or less of the diameter of the gas vent hole 6 of the sealing plate 7. It is preferable. The width L 1 is set to the gas vent hole 6 of the sealing plate 7.
If the length exceeds 90% of the diameter, the non-open area is pressed against the degassing hole 6 due to a rapid increase in gas pressure, or the non-open area of the bent tab 13 is dropped due to the dropping of the battery. When the open area is inserted into the gas vent hole 6, the non-open area may close the gas vent hole 6.
【００１１】前記孔１４の長さ（Ｌ2 ）は、前記封口板
７の前記ガス抜き孔６の径の１０％以上にすることが望
ましい。前記長さＬ2 を前記ガス抜き孔６の径の１０％
未満にすると、ガス圧力が急激に上昇した際に前記タブ
１３の長さ方向に隣接する非開孔領域が前記封口板７の
下面に押付けられて前記ガス抜き孔６を塞ぐ恐れがあ
る。また、電池が落下された際にタブ１３の長さ方向に
隣接する非開孔領域が折れ曲がり、前記ガス抜き孔６に
挿入されて前記ガス抜き孔６を塞ぐ恐れがある。The length (L 2 ) of the hole 14 is preferably 10% or more of the diameter of the gas vent hole 6 of the sealing plate 7. The length L 2 is 10% of the diameter of the gas vent hole 6
When the pressure is less than the range, when the gas pressure rapidly rises, the non-opening regions adjacent to each other in the length direction of the tab 13 may be pressed against the lower surface of the sealing plate 7 to close the gas vent hole 6. Further, when the battery is dropped, the non-open area adjacent to the lengthwise direction of the tab 13 may be bent and inserted into the gas vent hole 6 to close the gas vent hole 6.
【００１２】前記タブには、前述した図２に示すように
孔を１個形成しても良いが、複数の孔を前記タブの長さ
方向もしくは幅方向に形成しても良い。前記タブに複数
の孔を形成する場合には、前記各孔のタブの幅方向に隣
接する非開孔領域の幅は、前記封口板の前記ガス抜き孔
の径の９０％以下に相当する長さにすることが好まし
い。前記幅を前記封口板の前記ガス抜き孔の径の９０％
を越える長さにすると、ガス圧力の急激な上昇により前
記非開孔領域が前記ガス抜き孔に押付けられた際か、ま
たは前記電池の落下により折れ曲がったタブの前記非開
孔領域が前記ガス抜き孔に挿入された際に、前記非開孔
領域により前記ガス抜き孔が塞がれる恐れがある。Although one hole may be formed in the tab as shown in FIG. 2, a plurality of holes may be formed in the length direction or the width direction of the tab. When forming a plurality of holes in the tab, the width of the non-opening area adjacent to the width direction of the tab of each hole is a length corresponding to 90% or less of the diameter of the gas vent hole of the sealing plate. Preferably. The width is 90% of the diameter of the gas vent hole of the sealing plate.
When the length exceeds the range, when the non-open area is pressed against the gas vent hole due to a rapid increase in gas pressure, or when the battery is dropped, the non-open area of the bent tab is vented. When inserted into the hole, the non-open area may block the vent hole.
【００１３】また、前記タブの長さ方向に複数のガス抜
き孔を形成する際、前記孔間に位置する非開孔領域の長
さは、前記封口板の前記ガス抜き孔の径の９０％以下に
することが好ましい。前記長さが前記封口板の前記ガス
抜き孔の径の９０％を越えると、ガス圧力の急激な上昇
により前記非開孔領域が前記ガス抜き孔に押付けられた
際か、または前記電池の落下により折れ曲がったタブの
前記非開孔領域が前記ガス抜き孔に挿入された際に、前
記非開孔領域により前記ガス抜き孔が塞がれる恐れがあ
る。Further, when forming a plurality of gas vent holes in the length direction of the tab, the length of the non-opening region located between the holes is 90% of the diameter of the gas vent holes of the sealing plate. The following is preferable. When the length exceeds 90% of the diameter of the gas vent hole of the sealing plate, the non-open area is pressed against the gas vent hole due to a rapid increase in gas pressure, or the battery drops. When the non-perforated area of the bent tab is inserted into the gas vent hole, the non-perforated area may block the vent hole.
【００１４】前記タブの複数の孔が形成された領域の長
さは、前記ガス抜き孔６の径の１０％以上にすることが
好ましい。前記長さを前記ガス抜き孔の径の１０％未満
にすると、ガス圧力が急激に上昇した際にタブの複数の
孔が形成されていない領域が前記封口板７の下面に押付
けられて前記ガス抜き孔を塞ぐ恐れがある。また、電池
が落下された際にタブの複数の孔が形成されていない領
域が折れ曲がって前記ガス抜き孔に挿入され、前記ガス
抜き孔を塞ぐ恐れがある。The length of the region of the tab where the plurality of holes are formed is preferably 10% or more of the diameter of the gas vent hole 6. When the length is less than 10% of the diameter of the gas vent hole, when the gas pressure rises sharply, the region where the plurality of holes of the tab is not formed is pressed against the lower surface of the sealing plate 7, and the gas is discharged. There is a risk of blocking the vent hole. Further, when the battery is dropped, a region of the tab in which the plurality of holes are not formed may be bent and inserted into the gas vent hole to close the gas vent hole.
【００１５】前記電池では前記封口板のガス抜き孔の形
状が円形であるため、前記ガス抜き孔の径を基準にした
が、前記ガス抜き孔の形状が矩形の場合にはタブの幅方
向と平行な長さを基準にすれば良い。In the battery, since the shape of the gas vent hole of the sealing plate is circular, the diameter of the gas vent hole is used as a reference, but when the shape of the gas vent hole is rectangular, the width direction of the tab is The parallel length may be used as a reference.
【００１６】[0016]
【作用】本発明の防爆機能付き電池によれば、ユーザが
誤って火中に投入する等により電池内の温度が極めて高
温になり、前記電池内にガスが発生してガス圧力が急激
に上昇し、前記ガス圧力によりリードタブ１２のタブ１
３が封口板７の下面に押付けられた際に前記タブ１３に
前記封口板７のガス抜き孔６と対向する位置に孔１４が
開口されているため、前記タブ１３が前記ガス抜き孔６
を塞ぐのを防止することができる。その結果、前記電池
内のガスは前記タブ１３の前記孔１４及び前記封口板７
の前記ガス抜き孔６を通して弾性弁体８に圧力を加える
ため、前記弾性弁体８が変形して持ち上げられ、前記封
口板７との間に隙間が生じる。従って、前記ガスが前記
隙間及び端子キャップ１０のガス抜き孔９から外部へ逃
散するため、破裂を防止することができる。According to the battery with an explosion-proof function of the present invention, the temperature inside the battery becomes extremely high due to the user accidentally throwing it into a fire, etc., gas is generated in the battery, and the gas pressure rapidly rises. However, due to the gas pressure, the tab 1 of the lead tab 12 is
Since the hole 13 is opened in the tab 13 at a position facing the gas vent hole 6 of the sealing plate 7 when the tab 3 is pressed against the lower surface of the sealing plate 7, the tab 13 is closed by the gas vent hole 6.
Can be prevented. As a result, the gas in the battery is generated by the holes 14 of the tab 13 and the sealing plate 7.
Since pressure is applied to the elastic valve body 8 through the gas vent hole 6, the elastic valve body 8 is deformed and lifted, and a gap is formed between the elastic valve body 8 and the sealing plate 7. Therefore, the gas escapes from the gap and the gas vent hole 9 of the terminal cap 10 to the outside, so that the burst can be prevented.
【００１７】また、ユーザが前記電池を誤って落下さ
せ、これにより電極群が前記封口板７に向かって移動さ
れて前記タブ１３を前記封口板７に押付けると、前記タ
ブ１３が折れ曲がって前記ガス抜き孔６に挿入される。
前記タブ１３に前記ガス抜き孔６と対向する位置に前記
孔１４が開口されているため、前記ガス抜き孔６に挿入
されたタブ１３が前記ガス抜き孔６を塞ぐのを防止する
ことができる。従って、前記電池において例えば過充
電、過放電等によりガスが発生した際に、破裂を生じる
のを防止することができる。When the user accidentally drops the battery and the electrode group is moved toward the sealing plate 7 to press the tab 13 against the sealing plate 7, the tab 13 bends and the electrode is bent. It is inserted into the gas vent hole 6.
Since the hole 14 is formed in the tab 13 at a position facing the gas vent hole 6, it is possible to prevent the tab 13 inserted in the gas vent hole 6 from closing the gas vent hole 6. . Therefore, when gas is generated in the battery due to overcharge, overdischarge, or the like, it is possible to prevent the battery from bursting.
【００１８】[0018]
【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。 実施例 まず、活物質としての水酸化ニッケル粉末と、酸化コバ
ルトと、高分子結着剤とを含むペーストを調製し、これ
を帯状のフェルト状金属繊維多孔体にその長手方向に沿
う一方側の端部のリード溶接箇所を除いて充填し、乾燥
した後、ローラプレスで圧延することにより正極を作製
した。つづいて、前記正極の長手方向に沿う一方側の端
部にリードタブのリードを溶接した。このリードタブ
は、幅が４ｍｍ、長さが１５ｍｍのタブを有する。前記
タブには、前述した図２に示すように幅が２ｍｍ、長さ
（Ｌ2 ）が４ｍｍの矩形の孔が開口され、後述する電池
組立て後において封口板のガス抜き孔と対向される。ま
た、前記長さＬ2 は、前記ガス抜き孔の径の約１３３％
に相当する。なお、前記孔は、タブの幅方向に隣接する
非開孔領域の幅Ｌ1 が前記ガス抜き孔の径の３０％に相
当するように開口されている。Embodiments of the present invention will now be described in detail with reference to the drawings. Example First, a paste containing nickel hydroxide powder as an active material, cobalt oxide, and a polymer binder was prepared, and a paste was formed on a belt-shaped felt-like metal fiber porous body on one side along its longitudinal direction. The positive electrode was prepared by filling the area except the lead-welded area at the end, drying and rolling with a roller press. Subsequently, the lead of the lead tab was welded to one end of the positive electrode along the longitudinal direction. This lead tab has a tab with a width of 4 mm and a length of 15 mm. As shown in FIG. 2, a rectangular hole having a width of 2 mm and a length (L 2 ) of 4 mm is opened in the tab, and the tab is opposed to the gas vent hole of the sealing plate after the battery is assembled as described later. The length L 2 is about 133% of the diameter of the gas vent hole.
Equivalent to. The holes are opened such that the width L 1 of the non-opening regions adjacent to each other in the width direction of the tab corresponds to 30% of the diameter of the gas vent hole.
【００１９】また、前記負極は、活物質としての酸化カ
ドミウムと、ニッケル粉末と、高分子結着剤とを含むペ
ーストを調製し、前記ペーストをパンチドメタルに塗布
し、これを乾燥させた後、ローラプレスで圧延すること
により作製された。For the negative electrode, a paste containing cadmium oxide as an active material, nickel powder, and a polymer binder is prepared, the paste is applied to a punched metal, and the paste is dried. It was produced by rolling with a roller press.
【００２０】次いで、前記正極と前記負極との間にポリ
アミド繊維製不織布からなるセパレータを介して渦巻状
に捲回して電極群を作製した。前記電極群をＡＡサイズ
の円筒形容器に収納した後、７規定のＫＯＨ及び１規定
のＬｉＯＨからなるアルカリ電解液を注入した。ひきつ
づき、防爆機能及び正極端子を兼ねる封口部材の封口板
の下面に前記タブの先端をスポット溶接により固定し
た。前記封口板には直径３ｍｍの円形ガス抜き孔が開口
されている。その後、前記封口部材を前記容器の開口部
にかしめ固定により取付けることにより前述した図２に
示す構造を有するＡＡサイズのニッケルカドミウム二次
電池を組み立てた。 比較例 ガス抜き孔がないタブを有するリードタブを用いた以
外、実施例と同様な構成で前述した図２に示す構造を有
するＡＡサイズのニッケルカドミウム二次電池を組み立
てた。Then, an electrode group was produced by spirally winding the positive electrode and the negative electrode with a separator made of a polyamide fiber non-woven fabric interposed therebetween. After accommodating the electrode group in an AA size cylindrical container, an alkaline electrolyte consisting of 7N KOH and 1N LiOH was injected. Subsequently, the tip of the tab was fixed by spot welding to the lower surface of the sealing plate of the sealing member that also has an explosion-proof function and a positive electrode terminal. A circular vent hole having a diameter of 3 mm is opened in the sealing plate. Then, the sealing member was caulked and fixed to the opening of the container to assemble an AA size nickel cadmium secondary battery having the structure shown in FIG. Comparative Example An AA size nickel cadmium secondary battery having the structure shown in FIG. 2 described above was assembled with the same configuration as that of the example except that a lead tab having a tab without a vent hole was used.
【００２１】得られた実施例及び比較例の二次電池それ
ぞれ５０個について火中に投入した際の破裂の有無を調
べ、その結果を下記表１に示す。 表１ 破裂を生じた電池の個数 破裂率（％） 実施例 なし ０ 比較例 ３ ６ 表１から明らかなように、タブに孔が封口板のガス抜き
孔と対向するように開口されているリードタブを備えた
実施例の電池は、火中に投入された際の破裂が皆無であ
ることがわかる。これに対し、ガス抜き孔なしのタブを
有するリードタブを備えた比較例の電池は、火中に投入
された際に破裂を生じることがわかる。For each of the 50 secondary batteries obtained in the examples and comparative examples, the presence or absence of rupture when thrown into a fire was examined, and the results are shown in Table 1 below. Table 1 Number of ruptured batteries Burst rate (%) Example None 0 Comparative example 3 6 As is clear from Table 1, a lead tab having a hole formed in the tab so as to face the gas vent hole of the sealing plate. It can be seen that the batteries of the examples provided with No rupture when fired. On the other hand, it can be seen that the battery of the comparative example provided with the lead tab having the tab without the gas vent hole bursts when thrown into fire.
【００２２】前記実施例では安全弁として前述した図１
に示す弾性弁体からなり、弁作動後に再び封口板のガス
抜き孔を密閉する復帰式のものを用いたが、安全弁とし
ては前記封口板と前記端子キャップとの間に前記封口板
のガス抜き孔を覆うように介装された弁膜（例えば可撓
性薄膜から形成される）からなる非復帰式のものを用い
ることができる。前記非復帰式の安全弁を備えた電池で
は、前記電池内のガスが前記タブの前記孔及び前記封口
板の前記ガス抜き孔を通して前記弁膜に圧力を加え、こ
れを破断する。従って、前記ガスは前記弁膜の破断箇所
及び前記端子キャップの前記ガス抜き孔から外部に逃散
し、前記電池の破裂が防止される。In the above embodiment, the safety valve shown in FIG.
The elastic valve body shown in Fig. 4 was used, and a resettable type was used in which the gas vent hole of the sealing plate was closed again after the valve was actuated. A non-reset type valve valve (for example, formed of a flexible thin film) interposed so as to cover the hole may be used. In the battery provided with the non-reset type safety valve, the gas in the battery applies pressure to the valve membrane through the hole of the tab and the gas vent hole of the sealing plate to break it. Therefore, the gas escapes to the outside from the breakage point of the valve membrane and the gas vent hole of the terminal cap, and the bursting of the battery is prevented.
【００２３】前記実施例では、円筒形のニッケルカドミ
ウム二次電池に適用した例を説明したが、角形のニッケ
ルカドミウム二次電池にも同様に適用することができ
る。前記実施例では、ニッケルカドミウム二次電池に適
用した例を説明したが、ニッケル水素二次電池、リチウ
ムイオン二次電池、リチウム電池にも同様に適用するこ
とができる。In the above-mentioned embodiment, the example applied to the cylindrical nickel-cadmium secondary battery has been described, but the present invention can also be applied to the rectangular nickel-cadmium secondary battery. In the above-mentioned embodiment, the example applied to the nickel-cadmium secondary battery has been described, but the invention can also be applied to the nickel-hydrogen secondary battery, the lithium-ion secondary battery, and the lithium battery.
【００２４】[0024]
【発明の効果】以上詳述したように本発明の防爆機能付
き電池によれば、火中に投入される等により電池内のガ
ス圧力が急激に上昇した際の破裂を防止することができ
ると共に落下により折れ曲がった帯状リードが封口板の
ガス抜き孔に挿入され、この状態においてガスが発生し
た際の破裂を防止することができ、安全性及び信頼性を
向上できるという顕著な効果を奏する。As described above in detail, according to the battery with the explosion-proof function of the present invention, it is possible to prevent the explosion when the gas pressure in the battery suddenly rises due to being thrown into fire. The strip-shaped lead bent by dropping is inserted into the gas vent hole of the sealing plate, and in this state, it is possible to prevent rupture when gas is generated, and it is possible to improve safety and reliability.
【図１】本発明に係わる防爆機能付き電池を示す部分断
面図。FIG. 1 is a partial cross-sectional view showing a battery with an explosion-proof function according to the present invention.
【図２】本発明に係わる防爆機能付き電池に組み込まれ
るリードタブが取付けられた正極を示す斜視図。FIG. 2 is a perspective view showing a positive electrode to which a lead tab incorporated in an explosion-proof battery according to the present invention is attached.
【図３】従来の防爆機能付き電池を示す部分断面図。FIG. 3 is a partial cross-sectional view showing a conventional battery having an explosion-proof function.
１…正極、２…負極、３…セパレータ、４…容器、６…
ガス抜き孔、７…封口板、８…弾性弁体、１０…端子キ
ャップ、１１…絶縁ガスケット、１２…リードタブ、１
３…タブ、１４…孔。1 ... Positive electrode, 2 ... Negative electrode, 3 ... Separator, 4 ... Container, 6 ...
Gas vent hole, 7 ... Sealing plate, 8 ... Elastic valve element, 10 ... Terminal cap, 11 ... Insulation gasket, 12 ... Lead tab, 1
3 ... tab, 14 ... hole.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 添田 毅 東京都品川区南品川３丁目４番10号 東芝 電池株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Soeda 3-4-10 Minami-Shinagawa, Shinagawa-ku, Tokyo Inside Toshiba Battery Co., Ltd.
Claims (1)
間にセパレータを介装して作製された電極群と、 前記容器の開口部に取付けられたガス抜き孔を有する封
口板と、 前記封口板に前記ガス抜き孔を囲むように取付けられた
端子と、 前記封口板と前記端子との間に前記ガス抜き孔を塞ぐよ
うに配置された安全弁と、 一端が前記正極もしくは前記負極に取付けられ、かつ他
端が前記封口板の下面に取付けられ、前記封口板の前記
ガス抜き孔に対向する位置に孔が開口された帯状のリー
ドとを備えたことを特徴とする防爆機能付き電池。1. An electrode group housed in a container and made by interposing a separator between a positive electrode and a negative electrode, and a sealing plate having a gas vent hole attached to an opening of the container, A terminal attached to the sealing plate so as to surround the gas vent hole, a safety valve arranged so as to close the gas vent hole between the sealing plate and the terminal, and one end of the positive electrode or the negative electrode. A battery with an explosion-proof function, characterized in that the battery is attached, and the other end is attached to the lower surface of the sealing plate, and a band-shaped lead having a hole opened at a position facing the gas vent hole of the sealing plate. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6292550A JPH08153508A (en) | 1994-11-28 | 1994-11-28 | Explosionproof battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6292550A JPH08153508A (en) | 1994-11-28 | 1994-11-28 | Explosionproof battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08153508A true JPH08153508A (en) | 1996-06-11 |
Family
ID=17783224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6292550A Pending JPH08153508A (en) | 1994-11-28 | 1994-11-28 | Explosionproof battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08153508A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007103218A (en) * | 2005-10-06 | 2007-04-19 | Gs Yuasa Corporation:Kk | Battery |
| WO2011096035A1 (en) * | 2010-02-05 | 2011-08-11 | パナソニック株式会社 | Rectangular battery |
| CN108075087A (en) * | 2017-11-27 | 2018-05-25 | 安徽中能众诚新能源科技有限公司 | A kind of power lithium battery safety valve |
| CN112310554A (en) * | 2020-11-18 | 2021-02-02 | 广东至力科技有限公司 | Explosion-proof structure of miniature lithium ion battery |
| US11047508B2 (en) | 2017-03-30 | 2021-06-29 | Donaldson Company, Inc. | Vent with relief valve |
-
1994
- 1994-11-28 JP JP6292550A patent/JPH08153508A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007103218A (en) * | 2005-10-06 | 2007-04-19 | Gs Yuasa Corporation:Kk | Battery |
| WO2011096035A1 (en) * | 2010-02-05 | 2011-08-11 | パナソニック株式会社 | Rectangular battery |
| CN102742059A (en) * | 2010-02-05 | 2012-10-17 | 松下电器产业株式会社 | Rectangular battery |
| JP5525551B2 (en) * | 2010-02-05 | 2014-06-18 | パナソニック株式会社 | Square battery |
| US9362587B2 (en) | 2010-02-05 | 2016-06-07 | Panasonic Intellectual Property Management Co., Ltd. | Rectangular battery |
| US11047508B2 (en) | 2017-03-30 | 2021-06-29 | Donaldson Company, Inc. | Vent with relief valve |
| US11692644B2 (en) | 2017-03-30 | 2023-07-04 | Donaldson Company, Inc. | Vent with relief valve |
| CN108075087A (en) * | 2017-11-27 | 2018-05-25 | 安徽中能众诚新能源科技有限公司 | A kind of power lithium battery safety valve |
| CN108075087B (en) * | 2017-11-27 | 2020-07-07 | 安徽中能众诚新能源科技有限公司 | Power lithium battery safety valve |
| CN112310554A (en) * | 2020-11-18 | 2021-02-02 | 广东至力科技有限公司 | Explosion-proof structure of miniature lithium ion battery |
| CN112310554B (en) * | 2020-11-18 | 2022-03-29 | 广东至力科技有限公司 | Explosion-proof structure of miniature lithium ion battery |
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