JPH117930A - Sealed battery - Google Patents
Sealed batteryInfo
- Publication number
- JPH117930A JPH117930A JP9162733A JP16273397A JPH117930A JP H117930 A JPH117930 A JP H117930A JP 9162733 A JP9162733 A JP 9162733A JP 16273397 A JP16273397 A JP 16273397A JP H117930 A JPH117930 A JP H117930A
- Authority
- JP
- Japan
- Prior art keywords
- sealing plate
- vent hole
- cap
- terminal cap
- dish
- 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]
【発明の属する技術分野】本発明、安全弁機構を備えた
密閉型電池に関する。TECHNICAL FIELD The present invention relates to a sealed battery provided with a safety valve mechanism.
【０００２】[0002]
【従来の技術】携帯電話等の携帯用電子機器に使用され
る電池としては、ニッケルカドミウム二次電池、ニッケ
ル水素二次電池、リチウムイオン二次電池等に代表され
る密閉型二次電池が知られている。2. Description of the Related Art As batteries used in portable electronic devices such as mobile phones, sealed secondary batteries represented by nickel cadmium secondary batteries, nickel hydrogen secondary batteries, lithium ion secondary batteries, etc. are known. Have been.
【０００３】ところで、前記二次電池において、誤使用
による異常電流充電や逆充電、使用後の電池の火中への
廃棄等により高温状態に曝されると、電池内部に異常に
ガスが発生する。異常なガス発生は、電池内部の圧力を
上昇させるため、電池を密閉する封口板が吹き飛ぶ等の
事故を招く恐れがある。When the secondary battery is exposed to high temperatures due to abnormal current charging or reverse charging due to misuse, disposal of the used battery in a fire, etc., abnormal gas is generated inside the battery. . The abnormal gas generation increases the pressure inside the battery, and may cause an accident such as a blow-off of a sealing plate that seals the battery.
【０００４】このようなことから、外装缶内部のガス発
生による圧力上昇に応動して外装缶内部のガスを排出さ
せる復帰型安全弁機構を有する密閉型二次電池が開発さ
れている。この二次電池は、外装缶と、この外装缶内に
収納され、正極、セパレータおよび負極からなる電極群
と、前記外装缶内に収容された電解液と、前記外装缶の
上端開口部に絶縁ガスケットにより気密にカシメ固定さ
れ、中央付近にガス抜き穴が開口された封口板と、この
ガス抜き穴を含む前記封口板の上に配置され、通気口を
有する皿状端子キャップと、前記封口板と前記キャップ
の間に前記ガス抜き穴を覆うように圧縮された状態で配
置された例えばゴムからなる弾性弁体とを具備した構造
を有する。[0004] Under such circumstances, a sealed secondary battery having a return-type safety valve mechanism for discharging gas from the inside of the outer can in response to a pressure increase due to gas generation inside the outer can has been developed. The secondary battery has an outer can, an electrode group housed in the outer can and including a positive electrode, a separator, and a negative electrode, an electrolytic solution housed in the outer can, and an insulation at an upper end opening of the outer can. A sealing plate air-tightly fixed by a gasket and having a vent hole opened near the center, a dish-shaped terminal cap disposed on the sealing plate including the vent hole, and having a vent, And an elastic valve body made of, for example, rubber, which is arranged between the cap and the cap so as to cover the gas vent hole.
【０００５】このような密閉型二次電池は、前述したよ
うに高温に曝されることにより前記外装缶内部にガスが
発生して内圧が異常に上昇すると、ガス圧力が前記封口
板のガス抜き穴を通して前記封口板と前記皿状端子キャ
ップの間に配置された前記弾性弁体を前記キャップ側に
押し上げ、前記ガス抜き穴を開く。前記封口板のガス抜
き穴が開くと、前記外装缶内部のガスは前記ガス抜き穴
を通して前記封口板と前記キャップとで囲繞された空間
に流出し、さらに前記キャップの通気口を通して外部に
排出される。その結果、密閉型二次電池の損傷、破裂を
防ぐことが可能になる。[0005] As described above, in such a sealed type secondary battery, when gas is generated inside the outer can due to exposure to a high temperature and the internal pressure rises abnormally, the gas pressure rises in the sealing plate. The elastic valve body disposed between the sealing plate and the dish-shaped terminal cap is pushed up to the cap side through the hole to open the gas vent hole. When the vent hole of the sealing plate is opened, the gas inside the outer can flows out through the vent hole into the space surrounded by the sealing plate and the cap, and is further discharged to the outside through the vent hole of the cap. You. As a result, damage and rupture of the sealed secondary battery can be prevented.
【０００６】しかしながら、密閉型二次電池が前述した
ような高温の雰囲気に曝されると、電池内部のセパレー
タ等が溶融して異常発生したガスと共に噴出し、皿状端
子キャップの通気口を閉塞してガスの放出を妨げるた
め、電池が破裂するという問題があった。However, when the sealed secondary battery is exposed to the above-described high-temperature atmosphere, the separator and the like inside the battery are melted and ejected together with the abnormally generated gas, thereby closing the ventilation port of the dish-shaped terminal cap. As a result, there is a problem that the battery explodes because gas emission is hindered.
【０００７】[0007]
【発明が解決しようとする課題】本発明の目的は、誤使
用等により高温に曝された場合でも、弾性弁体を有する
安全弁機構を確実に作動させることが可能な密閉型電池
を提供しようとするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a sealed battery capable of reliably operating a safety valve mechanism having an elastic valve body even when exposed to a high temperature due to misuse or the like. Is what you do.
【０００８】[0008]
【課題を解決するための手段】本発明の請求項１に係わ
る密閉型電池は、外装缶；前記外装缶内に収納され、正
極、セパレータおよび負極からなる電極群；前記外装缶
内に収容された電解液；前記外装缶の上端開口部に絶縁
ガスケットにより気密にカシメ固定された封口板；前記
封口板の上に配置された皿状端子キャップ；前記封口板
の中央付近に開口されたガス抜き穴、前記皿状端子キャ
ップに開口された通気口、および前記封口板と前記キャ
ップの間に前記ガス抜き穴を覆うように圧縮された状態
で配置された弾性弁体を有する安全弁機構；を具備し、
前記皿状端子キャップに開口された通気口は、２〜４個
で、かつ総面積が２．５〜７．０ｍｍ2 であることを特
徴とするものである。According to a first aspect of the present invention, there is provided a sealed battery comprising: an outer can; an electrode group including a positive electrode, a separator, and a negative electrode housed in the outer can; Electrolyte plate; a sealing plate airtightly fixed by caulking with an insulating gasket to the upper end opening of the outer can; a dish-shaped terminal cap placed on the sealing plate; a vent opening near the center of the sealing plate A safety valve mechanism having a hole, a ventilation opening opened in the dish-shaped terminal cap, and an elastic valve body disposed in a compressed state between the sealing plate and the cap so as to cover the gas vent hole. And
The number of air vents opened in the dish-shaped terminal cap is two to four, and the total area is 2.5 to 7.0 mm 2 .
【０００９】本発明の請求項２に係わる密閉型電池は、
外装缶；前記外装缶内に収納され、正極、セパレータお
よび負極からなる電極群；前記外装缶内に収容された電
解液；前記外装缶の上端開口部に絶縁ガスケットにより
気密にカシメ固定された封口板；前記封口板の上に配置
された皿状端子キャップ；前記封口板の中央付近に開口
されたガス抜き穴、前記皿状端子キャップに開口された
通気口、および前記封口板と前記キャップの間に前記ガ
ス抜き穴を覆うように圧縮された状態で配置された弾性
弁体を有する安全弁機構；を具備し、前記皿状端子キャ
ップに開口された通気口は、円形状もしくは楕円形状を
なし、数が２〜４個で、かつ径（楕円形の場合は短径）
が０．８〜２．０ｍｍであることを特徴とするものであ
る。A sealed battery according to a second aspect of the present invention comprises:
An outer can; an electrode group that is housed in the outer can and includes a positive electrode, a separator, and a negative electrode; an electrolyte solution that is housed in the outer can; Plate; a dish-shaped terminal cap disposed on the sealing plate; a gas vent hole opened near the center of the sealing plate; a vent hole opened in the dish-shaped terminal cap; A safety valve mechanism having an elastic valve body disposed in a compressed state so as to cover the gas vent hole, wherein the vent opening in the dish-shaped terminal cap has a circular or elliptical shape. , The number is 2 to 4 and the diameter (in the case of an elliptical shape, the short diameter)
Is 0.8 to 2.0 mm.
【００１０】[0010]
【発明の実施の形態】以下、本発明に係わる密閉型電池
を図１を参照して詳細に説明する。例えば負極端子を兼
ねる有底円筒形の外装缶１内には、電極群２が収納され
ている。前記電極群２は、正極３、セパレータ４および
負極５の積層物を渦巻状に巻回した構成になっている。
中央付近に開口部６を有する絶縁板７は前記電極群２の
上に配置されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sealed battery according to the present invention will be described in detail with reference to FIG. For example, an electrode group 2 is housed in a bottomed cylindrical outer can 1 also serving as a negative electrode terminal. The electrode group 2 has a configuration in which a laminate of the positive electrode 3, the separator 4, and the negative electrode 5 is spirally wound.
An insulating plate 7 having an opening 6 near the center is arranged on the electrode group 2.
【００１１】中央付近にガス抜き穴８を有する封口板９
は、前記外装缶１の上端開口部に絶縁ガスケット１０を
介してカシメ固定されている。側壁部に通気口１１が開
口された正極端子を兼ねる皿状端子キャップ１２は、前
記封口板９上に前記ガス抜き穴８を包囲するように例え
ば溶接により固定されている。ゴムからなる弾性弁体１
３は、前記封口板９と前記端子キャップ１２で囲繞され
る空間１４に前記ガス抜き穴８を閉塞するように圧縮さ
れた状態で挿入されている。正極リード１５は、一端が
前記電極群２の正極３に他端が前記封口板９の下面にそ
れぞれ接続されている。なお、前記封口板９のガス抜き
穴８、前記端子キャップ１２の通気口１１および前記弾
性弁体１３により安全弁機構を構成している。A sealing plate 9 having a vent hole 8 near the center.
Is caulked and fixed to the upper end opening of the outer can 1 via an insulating gasket 10. A dish-shaped terminal cap 12 also serving as a positive electrode terminal having a ventilation port 11 opened in a side wall portion is fixed on the sealing plate 9 so as to surround the gas vent hole 8 by, for example, welding. Elastic valve element 1 made of rubber
3 is inserted in a space 14 surrounded by the sealing plate 9 and the terminal cap 12 in a compressed state so as to close the gas vent hole 8. The positive electrode lead 15 has one end connected to the positive electrode 3 of the electrode group 2 and the other end connected to the lower surface of the sealing plate 9. In addition, a safety valve mechanism is constituted by the gas vent hole 8 of the sealing plate 9, the vent hole 11 of the terminal cap 12, and the elastic valve body 13.
【００１２】前記通気口１１の一つの形態は、数が２〜
４個で、かつ総面積が２．５〜７．０ｍｍ2 である。前
記端子キャップ１２の通気口１１の個数が２個未満で総
面積を２．５ｍｍ2未満にすると、セパレータ４の溶融
物を通気口１１を通して円滑に放出することが困難にな
る。一方、前記端子キャップ１２の通気口１１の個数が
４個を越え、かつ総面積が７．０ｍｍ2 を越えると、前
記端子キャップ１２の強度が低下して落下等の衝撃によ
り変形し、結果として内部に配置した弾性弁体１３も変
形して前述したガスの発生時に前記弁体１３の作動を阻
害する恐れがある。One form of the vent 11 has a number of two to two.
4 pieces, and the total area is 2.5 to 7.0 mm 2 . If the number of the vents 11 of the terminal cap 12 is less than two and the total area is less than 2.5 mm 2 , it becomes difficult to smoothly discharge the melt of the separator 4 through the vents 11. On the other hand, when the number of the vent holes 11 of the terminal cap 12 exceeds four and the total area exceeds 7.0 mm 2 , the strength of the terminal cap 12 decreases, and the terminal cap 12 is deformed by an impact such as dropping. There is a possibility that the elastic valve body 13 disposed inside is also deformed and hinders the operation of the valve body 13 when the above-mentioned gas is generated.
【００１３】前記通気口１１の別の形態は、円形状もし
くは楕円形状をなし、数が２〜４個で、かつ径（楕円形
の場合は短径）が０．８〜２．０ｍｍである。前記端子
キャップ１２の円形状もしくは楕円形状をなす通気口１
１の個数が２個未満でそれらの径を０．８ｍｍ未満にす
ると、セパレータ４の溶融物を通気口１１を通して円滑
に放出することが困難になる。一方、前記端子キャップ
１２の通気口１１の個数が４個を越え、かつそれらの径
が２．０ｍｍ2 を越えると、前記端子キャップ１２の強
度が低下して落下等の衝撃により変形し、結果として内
部に配置した弾性弁体１３も変形して前述したガスの発
生時に前記弁体１３の作動を阻害する恐れがある。Another form of the vent 11 has a circular or elliptical shape, a number of 2 to 4 and a diameter (short diameter in the case of an elliptical shape) of 0.8 to 2.0 mm. . A circular or elliptical vent 1 of the terminal cap 12
If the number of 1 is less than 2 and their diameter is less than 0.8 mm, it becomes difficult to smoothly discharge the melt of the separator 4 through the vent 11. On the other hand, when the number of the vent holes 11 of the terminal cap 12 exceeds four and their diameter exceeds 2.0 mm 2 , the strength of the terminal cap 12 decreases, and the terminal cap 12 is deformed by an impact such as dropping. The elastic valve body 13 disposed inside may also be deformed and obstruct the operation of the valve body 13 when the gas is generated as described above.
【００１４】前記各通気口１１は、前記端子キャップ１
２に対称的に開口することが好ましい。以上説明した本
発明に係わる密閉型電池は、外装缶１の上端開口部に中
央付近にガス抜き穴８を有する封口板９を絶縁ガスケッ
ト１０を介してカシメ固定し、この封口板９に２〜４個
で総面積２．５〜７．０ｍｍ2 の通気口１１が開口され
た正極端子を兼ねる皿状端子キャップ１２を前記ガス抜
き穴８を包囲するように固定し、さらに前記封口板９と
前記端子キャップ１２とで囲繞された空間にゴムからな
る弾性弁体１３を前記ガス抜き穴８を閉塞するように圧
縮された状態で挿入した構造を有する。Each of the vents 11 is connected to the terminal cap 1.
Preferably, the openings are symmetrical. In the sealed battery according to the present invention described above, a sealing plate 9 having a gas vent hole 8 near the center at the upper end opening of the outer can 1 is fixed by caulking via an insulating gasket 10. Four dish-shaped terminal caps 12 serving also as positive electrodes, each having a vent hole 11 having a total area of 2.5 to 7.0 mm 2 and having an opening area of 2.5 to 7.0 mm 2 , are fixed so as to surround the gas vent hole 8. An elastic valve body 13 made of rubber is inserted into a space surrounded by the terminal cap 12 in a compressed state so as to close the gas vent hole 8.
【００１５】このような構造の電池において、誤使用に
よる異常電流充電や逆充電、使用後の電池の火中への廃
棄等により高温状態に曝されると、外装缶１内部に異常
にガスが発生し、同時に前記外装缶１内のセパレータ４
が溶融して前記ガスと共に噴出する。前記外装缶１内部
の圧力が上昇すると、ガス圧力が前記封口板９のガス抜
き穴８を通して前記封口板９と前記皿状端子キャップ１
２の間に配置された前記弾性弁体１３を前記キャップ１
２側に押し上げるため、前記ガス抜き穴８を開く。前記
封口板９のガス抜き穴８が開くと、前記外装缶１内部の
ガスは前記ガス抜き穴８を通して前記封口板８と前記キ
ャップ１２とで囲繞された空間１４に流出し、さらに前
記キャップ１２の通気口１１を通して外部に排出され
る。同時に、セパレータの溶融物もガスと共に前記ガス
抜き穴８を通して前記空間１４内に流入する。この際、
前記皿状端子キャップ１２には２〜４個で、かつ総面積
が２．５〜７．０ｍｍ2 の通気口１１が開口されている
ため、前記噴出したセパレータ４の溶融物を前記端子キ
ャップ１２の通気口１１を通して円滑に放出することが
できる。その結果、前記端子キャップ１２の通気口１１
が前記セパレータ４の溶融物で閉塞されることなく、外
装缶１内部のガスを放出できるため、電池の破裂が未然
に防止できる。In a battery having such a structure, if the battery is exposed to a high temperature state due to abnormal current charging or reverse charging due to misuse, disposal of the used battery in a fire, etc., an abnormal gas may be generated inside the outer can 1. Generated and at the same time the separator 4 in the outer can 1
Melts and spouts out with the gas. When the pressure inside the outer can 1 increases, the gas pressure passes through the vent hole 8 of the sealing plate 9 and the sealing plate 9 and the dish-shaped terminal cap 1.
2 and the elastic valve element 13
The gas vent hole 8 is opened to push it up to the second side. When the gas vent hole 8 of the sealing plate 9 is opened, the gas inside the outer can 1 flows out through the gas vent hole 8 into the space 14 surrounded by the sealing plate 8 and the cap 12, The air is discharged to the outside through the ventilation port 11. At the same time, the molten material of the separator flows into the space 14 through the vent hole 8 together with the gas. On this occasion,
Since two to four vent holes 11 having a total area of 2.5 to 7.0 mm 2 are opened in the dish-shaped terminal cap 12, the molten material of the ejected separator 4 is transferred to the terminal cap 12. Can be smoothly discharged through the vent hole 11 of the first embodiment. As a result, the vent hole 11 of the terminal cap 12
Can be released from the inside of the outer can 1 without being blocked by the melt of the separator 4, so that the battery can be prevented from exploding.
【００１６】また、本発明に係わる別の密閉型電池は外
装缶１の上端開口部に中央付近にガス抜き穴８を有する
封口板９を絶縁ガスケット１０を介してカシメ固定し、
この封口板９に円形状もしくは楕円形状をなし、数が２
〜４個で、かつ径（楕円形の場合は短径）が０．８〜
２．０ｍｍの通気口１１が開口された正極端子を兼ねる
皿状端子キャップ１２を前記ガス抜き穴８を覆うように
固定し、さらに前記封口板９と前記端子キャップ１２の
間にゴムからなる弾性弁体１３を前記ガス抜き穴８を閉
塞するように圧縮された状態で挿入した構造を有する。In another sealed battery according to the present invention, a sealing plate 9 having a gas vent hole 8 near the center at the upper end opening of the outer can 1 is caulked and fixed via an insulating gasket 10,
This sealing plate 9 has a circular shape or an elliptical shape, and the number is 2
~ 4 pieces and diameter (minor diameter in the case of elliptical shape) 0.8 ~
A dish-shaped terminal cap 12 also serving as a positive electrode terminal having a 2.0 mm ventilation port 11 opened is fixed so as to cover the gas vent hole 8, and a rubber elastic material is provided between the sealing plate 9 and the terminal cap 12. It has a structure in which the valve 13 is inserted in a compressed state so as to close the gas vent hole 8.
【００１７】このような構造の電池において、誤使用に
よる異常電流充電や逆充電、使用後の電池の火中への廃
棄等により高温状態に曝されると、外装缶１内部に異常
にガスが発生し、同時に前記外装缶１内のセパレータ４
が溶融して前記ガスと共に噴出する。前記外装缶１内部
の圧力が上昇すると、前述したように前記外装缶１内部
のガスは前記ガス抜き穴８を通して前記封口板８と前記
キャップ１２とで囲繞された空間１４に流出し、さらに
前記キャップ１２の通気口１１を通して外部に排出され
る。同時に、セパレータの溶融物もガスと共に前記ガス
抜き穴８を通して前記空間１４内に流入する。この際、
前記皿状端子キャップ１２には円形状もしくは楕円形状
をなし、数が２〜４個で、かつ径（楕円形の場合は短
径）が０．８〜２．０ｍｍの通気口１１が開口されてい
るため、前記噴出したセパレータ４の溶融物を前記端子
キャップ１２の通気口１１を通して円滑に放出すること
ができる。その結果、前記端子キャップ１２の通気口１
１が前記セパレータ４の溶融物で閉塞されることなく、
外装缶１内部のガスを放出できるため、電池の破裂が未
然に防止できる。なお、前述した密閉型電池では端子キ
ャップを封口板に溶接により固定したが、例えば絶縁ガ
スケットに前記封口板と共に気密にカシメ固定してもよ
い。In a battery having such a structure, if the battery is exposed to a high temperature state due to abnormal current charging or reverse charging due to misuse, disposal of the used battery in a fire, or the like, abnormal gas may be generated inside the outer can 1. Generated and at the same time the separator 4 in the outer can 1
Melts and spouts out with the gas. When the pressure inside the outer can 1 increases, the gas inside the outer can 1 flows through the vent hole 8 into the space 14 surrounded by the sealing plate 8 and the cap 12 as described above, and furthermore, The air is discharged to the outside through the vent 11 of the cap 12. At the same time, the molten material of the separator flows into the space 14 through the vent hole 8 together with the gas. On this occasion,
The dish-shaped terminal cap 12 has a circular or elliptical shape, and is provided with a vent 11 having a number of 2 to 4 and a diameter (short diameter in the case of an elliptical shape) of 0.8 to 2.0 mm. Therefore, the ejected melt of the separator 4 can be smoothly discharged through the vent 11 of the terminal cap 12. As a result, the vent 1 of the terminal cap 12
1 is not blocked by the melt of the separator 4,
Since the gas inside the outer can 1 can be released, the rupture of the battery can be prevented. In the sealed battery described above, the terminal cap is fixed to the sealing plate by welding. However, the terminal cap may be air-tightly fixed to an insulating gasket together with the sealing plate.
【００１８】[0018]
【実施例】以下、本発明の実施例を前述した図１を参照
して詳細に説明する。 （実施例１〜３、比較例１、２） ＜ペースト式負極の作製＞市販のランタン富化したミッ
シュメタルＬｍおよびＮｉ、Ｃｏ、Ｍｎ、Ａｌを用いて
高周波炉によって、ＬｍＮｉ4.0 Ｃｏ0.4 Ｍｎ0.3 Ａｌ
0.3 の組成からなる水素吸蔵合金を作製した。前記水素
吸蔵合金を機械粉砕し、これを２００メッシュの篩を通
過させた。得られた水素吸蔵合金粉末１００ｇに高分子
結着剤としてポリアクリル酸ナトリウム０．５ｇ、カル
ボキシメチルセルロース（ＣＭＣ）０．０５ｇ、ポリテ
トラフルオロエチレンのディスパージョン（比重１．
５，固形分６０ｗｔ％）１．６ｍｌと、アセチレンブラ
ックと、水６０ｍｌとを添加して混練することによって
ペーストを調製した。このペーストを導電性基板として
のパンチドメタルに塗布、乾燥し、さらにプレスし、裁
断することによってペースト式負極を作製した。An embodiment of the present invention will be described below in detail with reference to FIG. (Examples 1 to 3 and Comparative Examples 1 and 2) <Preparation of Paste-Type Negative Electrode> LmNi 4.0 Co 0.4 Mn 0.3 using a commercially available lanthanum-enriched misch metal Lm and Ni, Co, Mn, and Al by a high frequency furnace. Al
A hydrogen storage alloy having a composition of 0.3 was prepared. The hydrogen storage alloy was mechanically pulverized and passed through a 200-mesh sieve. To 100 g of the obtained hydrogen storage alloy powder, 0.5 g of sodium polyacrylate, 0.05 g of carboxymethylcellulose (CMC) as a polymer binder, and a dispersion of polytetrafluoroethylene (specific gravity 1.
5, solid content 60 wt%), 1.6 ml, acetylene black, and 60 ml of water were added and kneaded to prepare a paste. This paste was applied to a punched metal as a conductive substrate, dried, pressed and cut to produce a paste type negative electrode.
【００１９】＜ペースト式正極の作製＞水酸化ニッケル
粉末９０重量部および一酸化コバルト粉末１０重量部か
らなる混合粉体に、前記水酸化ニッケル粉末に対してカ
ルボキシメチルセルロース０．３重量部、ポリテトラフ
ルオロエチレンのディスパージョン（比重１．５，固形
分６０重量％）を固形分換算で０．５重量部添加し、こ
れらに純水を４５重量部添加して混練することによりペ
ーストを調製した。つづいて、このペーストをニッケル
メッキ繊維基板内に充填した後、更にその両表面に前記
ペーストを塗布し、乾燥し、ローラプレスを行って圧延
することによりペースト式正極を作製した。<Preparation of Paste-Type Positive Electrode> In a mixed powder consisting of 90 parts by weight of nickel hydroxide powder and 10 parts by weight of cobalt monoxide powder, 0.3 parts by weight of carboxymethylcellulose, A paste was prepared by adding 0.5 parts by weight of a dispersion of fluoroethylene (specific gravity: 1.5, solid content: 60% by weight) in terms of solid content, adding 45 parts by weight of pure water thereto, and kneading. Subsequently, after this paste was filled in a nickel-plated fiber substrate, the paste was further applied to both surfaces thereof, dried, and rolled by roller pressing to produce a paste-type positive electrode.
【００２０】次いで、前記負極と前記正極との間にポリ
プロピレン繊維製不織布を介装し、渦巻状に捲回して電
極群を作製した。このような電極群をニッケルメッキが
施された鉄からなる外装缶内に収納した後、８ＮのＫＯ
Ｈからなる電解液を前記外装缶に注入した。つづいて、
正極リードの一端を前記電極群の正極に接続し、かつ他
端を中央付近にガス抜き穴を有するニッケルメッキが施
された鉄からなる封口板の下面に接続した後、前記封口
板を前記外装缶の上端開口部に絶縁ガスケットを介して
カシメ固定した。ゴムからなる弾性弁体を前記封口板上
に前記ガス抜き穴を閉塞するように配置した。この後、
側壁部に総面積が下記表１に示す３個の通気口が対称的
に開口されたニッケルメッキが施された鉄からなる正極
端子を兼ねる皿状端子キャップを前記封口板上に前記弾
性弁体を圧縮してそれぞれ配置し、溶接により前記封口
板に固定することにより前述した図１に示す構造を有す
る５種の単３型の密閉型円筒状ニッケル水素二次電池を
組み立てた。Next, a nonwoven fabric made of polypropylene fiber was interposed between the negative electrode and the positive electrode, and spirally wound to form an electrode group. After storing such an electrode group in an outer can made of nickel-plated iron, an 8N KO
An electrolyte solution consisting of H was injected into the outer can. Then,
After connecting one end of a positive electrode lead to the positive electrode of the electrode group, and the other end to the lower surface of a nickel-plated iron sealing plate having a gas vent hole near the center, the sealing plate is covered with the outer package. The upper end of the can was swaged and fixed via an insulating gasket. An elastic valve body made of rubber was arranged on the sealing plate so as to close the gas vent hole. After this,
A plate-shaped terminal cap serving also as a positive electrode terminal made of nickel-plated iron and having a symmetrically opened three ventilation ports having a total area shown in Table 1 below on the side wall portion is provided on the sealing plate with the elastic valve body. Were compressed and arranged, and were fixed to the sealing plate by welding to assemble five types of AA sealed cylindrical nickel-metal hydride secondary batteries having the structure shown in FIG. 1 described above.
【００２１】得られた実施例１〜３および比較例１、２
のニッケル水素二次電池をそれぞれ５０本用意し、これ
らを火中に投入して破裂した電池の本数を調べた。その
結果を同表１に併記する。The obtained Examples 1 to 3 and Comparative Examples 1 and 2
Were prepared and charged in a fire, and the number of ruptured batteries was examined. The results are also shown in Table 1.
【００２２】[0022]
【表１】 [Table 1]
【００２３】前記表１から明らかなように３個で、かつ
総面積が２．５〜７．０ｍｍ2 である通気口が開口され
た端子キャップを封口板に取り付けた実施例１〜３の二
次電池は、破裂が零であることがわかる。これに対し、
個数が３個と同数であるが、総面積が２．５ｍｍ2 未満
である通気口が開口された端子キャップを封口板に取り
付けた比較例１、２の二次電池はそれぞれ５０本中、３
本、２本が破裂を生じ、安全性の問題があった。As can be seen from Table 1, three terminal caps having a total area of 2.5 to 7.0 mm 2 and having open vents are mounted on the sealing plate. It can be seen that the secondary battery has zero burst. In contrast,
The number of the secondary batteries of Comparative Examples 1 and 2 in which the number of the batteries was the same as that of the three batteries but the terminal caps having the total area of less than 2.5 mm 2 and the vent holes were opened were attached to the sealing plate.
These two ruptured, and there was a safety problem.
【００２４】（実施例４〜６、比較例３）側壁部に総面
積が２．５ｍｍ2 で下記表２に示す個数の通気口が開口
された皿状端子キャップを用いた以外、実施例１と同様
な方法により前述した図１に示す構造の５種の単３型の
密閉型円筒状ニッケル水素二次電池を組み立てた。な
お、実施例４〜６のように２個以上の通気口を端子キャ
ップに開口する際には、それらの通気口を前記キャップ
の側壁に対称的に配置した。(Examples 4 to 6, Comparative Example 3) Example 1 except that a dish-shaped terminal cap having a total area of 2.5 mm 2 on the side wall and having the number of ventilation holes shown in Table 2 below was used. By the same method as described above, five types of AA sealed cylindrical nickel-metal hydride secondary batteries having the structure shown in FIG. 1 described above were assembled. When two or more vents were opened in the terminal cap as in Examples 4 to 6, those vents were symmetrically arranged on the side wall of the cap.
【００２５】得られた実施例４〜６および比較例３のニ
ッケル水素二次電池をそれぞれ５０本用意し、これらを
火中に投入して破裂した電池の本数を調べた。その結果
を同表２に併記する。Fifty nickel-metal hydride secondary batteries of Examples 4 to 6 and Comparative Example 3 were prepared, each of which was put into a fire, and the number of ruptured batteries was examined. Table 2 also shows the results.
【００２６】[0026]
【表２】 [Table 2]
【００２７】前記表２から明らかなように総面積が２．
５ｍｍ2 で、かつ個数が２〜４個である通気口が開口さ
れた端子キャップを封口板に取り付けた実施例４〜６の
二次電池は、破裂が零であることがわかる。これに対
し、総面積が２．５ｍｍ2 であるが、個数が２個未満
（１個）である通気口が開口された端子キャップを封口
板に取り付けた比較例３の二次電池は５０本中、２本が
破裂を生じ、安全性の問題があった。As is clear from Table 2, the total area is 2.
It can be seen that the secondary batteries of Examples 4 to 6 in which the terminal caps each having 5 mm 2 and having 2 to 4 vent openings are attached to the sealing plate have zero burst. On the other hand, 50 secondary batteries of Comparative Example 3 in which a terminal cap having a total area of 2.5 mm 2 but having a number of less than two (one) vent holes opened were attached to the sealing plate. Among them, two ruptured, and there was a safety problem.
【００２８】（実施例７〜９、比較例４）側壁部に下記
表３に示す直径を有する３個の円形通気口が対称的に開
口された皿状端子キャップを用いた以外、実施例１と同
様な方法により前述した図１に示す構造の４種の単３型
の密閉型円筒状ニッケル水素二次電池を組み立てた。(Examples 7 to 9 and Comparative Example 4) Example 1 was the same as in Example 1 except that a dish-shaped terminal cap was used in which three circular vents having the diameters shown in Table 3 below were opened symmetrically on the side wall. Four types of AA sealed cylindrical nickel-metal hydride secondary batteries having the structure shown in FIG. 1 described above were assembled in the same manner as described above.
【００２９】得られた実施例７〜９および比較例４のニ
ッケル水素二次電池をそれぞれ５０本用意し、これらを
火中に投入して破裂した電池の本数を調べた。その結果
を同表３に併記する。Fifty nickel-metal hydride secondary batteries of Examples 7 to 9 and Comparative Example 4 were prepared, each of which was put into a fire, and the number of ruptured batteries was examined. Table 3 also shows the results.
【００３０】[0030]
【表３】 [Table 3]
【００３１】前記表２から明らかなように個数が３個
で、かつ直径が０．８〜２．０ｍｍである円形通気口が
開口された端子キャップを封口板に取り付けた実施例７
／９の二次電池は、破裂が零であることがわかる。これ
に対し、個数が３と同様であるが、直径が０．８ｍｍ未
満である円形通気口が開口された端子キャップを封口板
に取り付けた比較例４の二次電池は５０本中、３本が破
裂を生じ、安全性の問題があった。As is clear from Table 2, the seventh embodiment in which three terminal caps each having a circular vent opening having a diameter of 0.8 to 2.0 mm were attached to the sealing plate.
It can be seen that the secondary battery of / 9 has zero burst. On the other hand, the number of secondary batteries of Comparative Example 4 in which the number of the secondary batteries was the same as that of the three but whose terminal cap having a diameter of less than 0.8 mm and a circular vent was opened was attached to the sealing plate was three. Ruptured and had safety issues.
【００３２】（実施例１０〜１２、比較例５）側壁部に
直径０．８５ｍｍで下記表４に示す個数の通気口が開口
された皿状端子キャップを用いた以外、実施例１と同様
な方法により前述した図１に示す構造を有する４種の単
３型の密閉型円筒状ニッケル水素二次電池を組み立て
た。なお、実施例１０〜１２のように２個以上の通気口
を端子キャップに開口する際には、それらの通気口を前
記キャップの側壁に対称的に配置した。(Examples 10 to 12 and Comparative Example 5) The same as Example 1 except that a dish-shaped terminal cap having a diameter of 0.85 mm on the side wall portion and having the number of ventilation holes shown in Table 4 below was used. According to the method, four types of AA sealed cylindrical nickel-metal hydride secondary batteries having the structure shown in FIG. 1 described above were assembled. When two or more vents were opened in the terminal cap as in Examples 10 to 12, those vents were symmetrically arranged on the side wall of the cap.
【００３３】得られた実施例１０〜１２および比較例５
のニッケル水素二次電池をそれぞれ５０本用意し、これ
らを火中に投入して破裂した電池の本数を調べた。その
結果を同表４に併記する。The obtained Examples 10 to 12 and Comparative Example 5
Were prepared and charged in a fire, and the number of ruptured batteries was examined. Table 4 shows the results.
【００３４】[0034]
【表４】 [Table 4]
【００３５】前記表４から明らかなように直径が０．８
ｍｍで、かつ個数が２〜４個である円形通気口が開口さ
れた端子キャップを封口板に取り付けた実施例１０〜１
２の二次電池は、破裂が零であることがわかる。これに
対し、直径が０．８ｍｍであるが、個数が２個未満（１
個）である円形通気口が開口された端子キャップを封口
板に取り付けた比較例５の二次電池は５０本中、２本が
破裂を生じ、安全性の問題があった。As apparent from Table 4, the diameter is 0.8
Examples 10 to 1 in which terminal caps each having an opening of a circular vent hole having a diameter of 2 mm and having 2 to 4 pieces were attached to a sealing plate.
It can be seen that the secondary battery of No. 2 has zero burst. On the other hand, although the diameter is 0.8 mm, the number is less than 2 (1
Of the 50 secondary batteries of Comparative Example 5 in which a terminal cap having a circular vent opening formed on the sealing plate was ruptured, which had a safety problem.
【００３６】なお、前記実施例では円筒形のニッケル水
素二次電池に適用した例を説明したが正極、セパレータ
および負極を積層して電極群を構成する角形の形状のニ
ッケル水素二次電池にも同様に適用することができる。
また、前記実施例では密閉型ニッケル水素二次電池を例
示したが、リチウムイオン二次電池、ニッケルカドミウ
ム二次電池にも同様に適用できる。In the above embodiment, an example in which the present invention is applied to a cylindrical nickel-metal hydride secondary battery has been described. However, a square nickel-metal hydride secondary battery in which an electrode group is formed by laminating a positive electrode, a separator and a negative electrode is also described. The same can be applied.
In the above embodiment, the sealed nickel-metal hydride secondary battery is exemplified, but the present invention can be similarly applied to a lithium ion secondary battery and a nickel cadmium secondary battery.
【００３７】[0037]
【発明の効果】以上詳述しように、本発明によれば誤使
用等により高温に曝された場合でも、弾性弁体を有する
安全弁機構を確実に作動させることが可能な安全性の高
い密閉型電池を提供できる。As described above in detail, according to the present invention, even when exposed to a high temperature due to erroneous use or the like, a highly safe hermetic type which can reliably operate a safety valve mechanism having an elastic valve body. Battery can be provided.
【図１】本発明に係わる円筒形の密閉型電池を示す要部
断面図。FIG. 1 is a cross-sectional view of a main part showing a cylindrical sealed battery according to the present invention.
１…外装缶、 ２…電極群、 ３…正極、 ５…負極、 ８…ガス抜き穴、 ９…封口板 １０…絶縁ガスケット、 １１…通気口、 １２…端子キャップ、 １３…弾性弁体。 DESCRIPTION OF SYMBOLS 1 ... Outer can, 2 ... Electrode group, 3 ... Positive electrode, 5 ... Negative electrode, 8 ... Gas vent hole, 9 ... Sealing plate 10 ... Insulating gasket, 11 ... Vent hole, 12 ... Terminal cap, 13 ... Elastic valve body.
Claims (2)
極、セパレータおよび負極からなる電極群；前記外装缶
内に収容された電解液；前記外装缶の上端開口部に絶縁
ガスケットにより気密にカシメ固定された封口板；前記
封口板の上に配置された皿状端子キャップ；前記封口板
の中央付近に開口されたガス抜き穴、前記皿状端子キャ
ップに開口された通気口、および前記封口板と前記キャ
ップの間に前記ガス抜き穴を覆うように圧縮された状態
で配置された弾性弁体を有する安全弁機構；を具備し、 前記皿状端子キャップに開口された通気口は、２〜４個
で、かつ総面積が２．５〜７．０ｍｍ2 であることを特
徴とする密閉型電池。1. An outer can; an electrode group housed in the outer can and comprising a positive electrode, a separator and a negative electrode; an electrolytic solution housed in the outer can; A sealing plate fixed by caulking; a dish-shaped terminal cap disposed on the sealing plate; a gas vent hole opened near the center of the sealing plate; a vent hole opened in the dish-shaped terminal cap; A safety valve mechanism having an elastic valve body disposed in a compressed state between the plate and the cap so as to cover the gas vent hole; A sealed battery comprising four batteries and a total area of 2.5 to 7.0 mm 2 .
極、セパレータおよび負極からなる電極群；前記外装缶
内に収容された電解液；前記外装缶の上端開口部に絶縁
ガスケットにより気密にカシメ固定された封口板；前記
封口板の上に配置された皿状端子キャップ；前記封口板
の中央付近に開口されたガス抜き穴、前記皿状端子キャ
ップに開口された通気口、および前記封口板と前記キャ
ップの間に前記ガス抜き穴を覆うように圧縮された状態
で配置された弾性弁体を有する安全弁機構；を具備し、 前記皿状端子キャップに開口された通気口は、円形状も
しくは楕円形状をなし、数が２〜４個で、かつ径（楕円
形の場合は短径）が０．８〜２．０ｍｍであることを特
徴とする密閉型電池。2. An outer can; an electrode group housed in the outer can and comprising a positive electrode, a separator, and a negative electrode; an electrolytic solution housed in the outer can; A sealing plate fixed by caulking; a dish-shaped terminal cap disposed on the sealing plate; a gas vent hole opened near the center of the sealing plate; a vent hole opened in the dish-shaped terminal cap; A safety valve mechanism having an elastic valve body disposed between the plate and the cap in a state of being compressed so as to cover the gas vent hole, wherein the ventilation port opened to the dish-shaped terminal cap has a circular shape. Or a sealed battery having an elliptical shape, a number of 2 to 4 and a diameter (short diameter in the case of an elliptical shape) of 0.8 to 2.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9162733A JPH117930A (en) | 1997-06-19 | 1997-06-19 | Sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9162733A JPH117930A (en) | 1997-06-19 | 1997-06-19 | Sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH117930A true JPH117930A (en) | 1999-01-12 |
Family
ID=15760239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9162733A Pending JPH117930A (en) | 1997-06-19 | 1997-06-19 | Sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH117930A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4811934A (en) * | 1985-07-25 | 1989-03-14 | Continental Aktiengesellschaft | Hydraulically damped resilient mounting |
| US4836515A (en) * | 1986-06-11 | 1989-06-06 | Firma Carl Freudenberg | Two-chamber engine mount having variable disc stops and variable choke canal means |
| WO2013046712A1 (en) * | 2011-09-29 | 2013-04-04 | パナソニック株式会社 | Sealed secondary battery |
-
1997
- 1997-06-19 JP JP9162733A patent/JPH117930A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4811934A (en) * | 1985-07-25 | 1989-03-14 | Continental Aktiengesellschaft | Hydraulically damped resilient mounting |
| US4836515A (en) * | 1986-06-11 | 1989-06-06 | Firma Carl Freudenberg | Two-chamber engine mount having variable disc stops and variable choke canal means |
| WO2013046712A1 (en) * | 2011-09-29 | 2013-04-04 | パナソニック株式会社 | Sealed secondary battery |
| CN103718334A (en) * | 2011-09-29 | 2014-04-09 | 松下电器产业株式会社 | Sealed secondary battery |
| US9337459B2 (en) | 2011-09-29 | 2016-05-10 | Panasonic Intellectual Property Management Co., Ltd. | Sealed secondary battery |
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