JP2000260410A - Sealed battery - Google Patents
Sealed batteryInfo
- Publication number
- JP2000260410A JP2000260410A JP11066054A JP6605499A JP2000260410A JP 2000260410 A JP2000260410 A JP 2000260410A JP 11066054 A JP11066054 A JP 11066054A JP 6605499 A JP6605499 A JP 6605499A JP 2000260410 A JP2000260410 A JP 2000260410A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- pressure
- sealed
- relief valve
- release valve
- 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
- 238000003776 cleavage reaction Methods 0.000 claims description 11
- 230000007017 scission Effects 0.000 claims description 11
- 239000003792 electrolyte Substances 0.000 abstract description 7
- 238000003466 welding Methods 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、密閉型電池に関
し、とくに内部圧力の増大の際に圧力を開放する圧力開
放弁を有するリチウムイオン電池等の密閉型電池に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery, and more particularly to a sealed battery such as a lithium ion battery having a pressure release valve for releasing pressure when the internal pressure increases.
【０００２】[0002]
【従来の技術】小型の電子機器が広く使われており、こ
れらの電源として電池が用いられている。携帯電話、ノ
ート型パソコン、カメラ一体型ビデオレコーダ等の電源
としては、小型で大容量の密閉型電池であるリチウムイ
オン二次電池等の非水電解液電池が用いられている。こ
れらの電池では、充放電時に異常な電池反応が進むと、
電池内部で圧力が上昇し、電池の爆発、燃焼等の事態が
発生する可能性がある。そこで、充放電時の過大な電
流、電池の過充電、過放電等を検出し、電流を遮断する
等の保護回路が設けられている。2. Description of the Related Art Small electronic devices are widely used, and batteries are used as power sources for these devices. Non-aqueous electrolyte batteries such as lithium ion secondary batteries, which are small, large-capacity sealed batteries, are used as power sources for mobile phones, notebook computers, video recorders with integrated cameras, and the like. In these batteries, when an abnormal battery reaction progresses during charging and discharging,
The pressure inside the battery may increase, and the battery may explode or burn. Therefore, a protection circuit for detecting an excessive current at the time of charging / discharging, overcharging and overdischarging of the battery, and interrupting the current is provided.
【０００３】ところが、これらの保護回路が正常に動作
しない場合や、電池が予期し得ない異常な状態で使用さ
れた場合には、電池内部の発電要素の化学反応によって
気体が発生し、電池内部の圧力が上昇し、電池の発熱、
発煙、発火等がおこり、最悪の場合には、破裂、爆発等
の危険が生じる。[0003] However, when these protection circuits do not operate normally or when the battery is used in an unexpected and abnormal state, gas is generated by a chemical reaction of a power generation element inside the battery, and gas inside the battery is generated. Pressure rises, the battery heats up,
Smoke, fire, etc. occur, and in the worst case, rupture, explosion, etc. may occur.
【０００４】特に、昨今の密閉型電池の小型大容量化に
伴い、電池内部に蓄えられるエネルギー量も格段と大き
くなり、異常な電池反応が発生すると異常反応は急激に
進むために、異常反応の早い段階、すなわちより低い圧
力で電池内部の圧力を開放し、より穏やかな状態で危険
を回避することが求められている。そこで、これらの電
池には内部圧力の上昇の際に内部圧力を開放する圧力開
放弁が設けられている。In particular, with the recent increase in the size and capacity of sealed batteries, the amount of energy stored inside the batteries has also increased significantly. When an abnormal battery reaction occurs, the abnormal reaction rapidly progresses. There is a need to relieve the pressure inside the battery at an early stage, i.e. at a lower pressure, and to avoid dangers in a more gentle state. Therefore, these batteries are provided with a pressure release valve that releases the internal pressure when the internal pressure increases.
【０００５】図３は、圧力開放弁を有する電池を説明す
る図である。図３は、角型電池１の上部を示す図であ
り、圧力開放弁を電池の上部に設けた例を説明する図で
ある。角型電池１においては、一般に電池缶２の上部の
開口部に、電流取り出し端子３等を設けた電極ヘッダ４
を溶接して電池を作製しており、電極ヘッダ４には、電
池内部の圧力上昇時に圧力を開放する圧力開放弁５を設
けている。FIG. 3 is a diagram illustrating a battery having a pressure relief valve. FIG. 3 is a diagram illustrating an upper portion of the prismatic battery 1 and is a diagram illustrating an example in which a pressure release valve is provided on the upper portion of the battery. In the prismatic battery 1, generally, an electrode header 4 provided with a current extraction terminal 3 and the like in an opening at an upper portion of the battery can 2.
Are welded to produce a battery, and the electrode header 4 is provided with a pressure release valve 5 for releasing pressure when the pressure inside the battery rises.
【０００６】図４は、電極ヘッダに設ける圧力開放弁を
説明する図である。圧力開放弁は、電極ヘッダの他の部
分よりも厚さが薄い金属で構成されており、図４（Ａ）
の電極ヘッダ４の圧力開放弁５は、電極ヘッダの構成部
材よりも厚みが薄い面状薄肉部５ａを設けたものであ
る。面状薄肉部５ａは、電極ヘッダの一部の厚みを薄く
するか、あるいは厚みの薄い金属を電極ヘッダに設けた
開口部に溶接あるいはかしめ等によって密着させて製造
されている。FIG. 4 is a view for explaining a pressure release valve provided on the electrode header. The pressure release valve is made of metal whose thickness is thinner than other portions of the electrode header.
The pressure release valve 5 of the electrode header 4 is provided with a planar thin portion 5a which is thinner than the constituent members of the electrode header. The planar thin portion 5a is manufactured by reducing the thickness of a part of the electrode header, or by attaching a thin metal to an opening provided in the electrode header by welding or caulking.
【０００７】図４（Ｂ）ないし図４（Ｅ）は、いずれも
溝状の薄肉部を設けたものであり、図４（Ａ）と同様に
電極ヘッダと一体に、あるいは電極ヘッダに溶接等の手
段で取り付けられている。図４（Ｂ）は、対角線状薄肉
部５ｂを設けたものであり、図４（Ｃ）は、コの字状薄
肉部５ｃを設けたものである。また、図４（Ｄ）は、放
射状薄肉部５ｄを設けたものであり、図４（Ｅ）は、馬
蹄状薄肉部５ｅを設けたものである。FIGS. 4 (B) to 4 (E) each show a groove-shaped thin portion provided, as in FIG. 4 (A), integrally with the electrode header or welding to the electrode header. It is attached by means of. FIG. 4B shows a case where a diagonal thin portion 5b is provided, and FIG. 4C shows a case where a U-shaped thin portion 5c is provided. FIG. 4D shows a case where a radial thin portion 5d is provided, and FIG. 4E shows a case where a horseshoe thin portion 5e is provided.
【０００８】[0008]
【発明が解決しようとする課題】ところが、従来の電池
の圧力開放弁は、いずれも圧力開放弁の面に垂直な方向
から作用する電池内部の圧力によって薄肉部が開裂する
ものであるので、比較的低い圧力で開裂させるために
は、薄肉部の厚さを薄くすることが必要であった。薄肉
部の厚さが薄くなると、強度が小さくなり通常時の圧力
の保持にも問題を生じたり、異物との接触によって開孔
が生じる等の可能性もあるので、薄肉部の周上に保護樹
脂を塗布、充填して補強する必要があった。このような
ものでは応答速度に問題を生じることがあった。そこで
圧力の増大時の開裂の応答が高速で、しかも充分な強度
を有し、簡便で安価な圧力開放弁を有する密閉型電池を
提供することが求められていた。とくに、電池の上部の
面積が小さな薄型の角型電池においては、圧力開放弁が
占める面積の割合が大きなものとなるので、圧力開放弁
によって電池の強度が小さくなることを防止することが
重要であり、開裂が速やかに起こり、強度が低下するこ
とがない圧力開放弁を有する密閉型電池を提供すること
が求められていた。However, in the conventional pressure relief valves of batteries, the thin portion is broken by the pressure inside the battery acting from a direction perpendicular to the surface of the pressure relief valve. In order to cleave at a very low pressure, it was necessary to reduce the thickness of the thin portion. If the thickness of the thin part is reduced, the strength will decrease and there will be a problem in holding the pressure under normal conditions, and there is a possibility of opening due to contact with foreign matter, so protection on the periphery of the thin part It was necessary to apply and fill a resin to reinforce. In such a case, a problem may occur in the response speed. Therefore, it has been demanded to provide a sealed battery having a simple and inexpensive pressure release valve, which has a fast response to cleavage when the pressure is increased, and has sufficient strength. In particular, in the case of a thin rectangular battery in which the area at the top of the battery is small, the ratio of the area occupied by the pressure relief valve is large, and it is important to prevent the strength of the battery from being reduced by the pressure relief valve. There has been a demand for providing a sealed battery having a pressure release valve in which cleavage occurs promptly and strength does not decrease.
【課題を解決するための手段】本発明は、開裂により電
池内部の圧力を開放する圧力開放弁を有する密閉型電池
において、面積が大きな面と面積が小さな面との接合部
の近傍の面積が小さな面に圧力開放弁を有し、圧力開放
弁は所定の圧力以上において開裂する薄肉部を有し、薄
肉部は接合部に平行な二本の溝からなり、それぞれの溝
は面積が大きな面の変形による変形力が作用する位置に
設けた密閉型電池である。。SUMMARY OF THE INVENTION The present invention relates to a sealed battery having a pressure release valve for releasing the pressure inside the battery by cleavage, wherein the area near the junction between a large area and a small area is reduced. It has a pressure relief valve on a small surface, the pressure relief valve has a thin portion that cleaves at a predetermined pressure or higher, and the thin portion is composed of two grooves parallel to the joint, each groove having a large area. Is a sealed battery provided at a position where a deformation force due to the deformation of. .
【０００９】[0009]
【発明の実施の形態】本発明は、角型電池のような密閉
型電池にあっては、内部圧力が増大すると、圧力は均等
に各面に作用するとともに、圧力開放弁を設けた面と接
合した面積の大きな面の圧力が増大の結果、電池缶の膨
らみを生じることとなり、膨らみによる変形力が圧力開
放弁を設けた面にも作用して圧力開放弁の溝部を開裂す
る力として作用することを見出したものである。すなわ
ち、図４に示したように、従来の圧力開放弁は、いずれ
も薄肉部が開裂する作用は、圧力開放弁の面に垂直な方
向から印加される圧力を利用したものであり、圧力開放
弁を設けた面と接合した面積が大きな面の変形を利用し
たものはなかった。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a sealed battery such as a prismatic battery. When the internal pressure increases, the pressure acts evenly on each surface and the surface provided with a pressure release valve is provided with a pressure relief valve. As a result of the increase in the pressure on the surface having a large joined area, the swelling of the battery can occurs, and the deformation force due to the swelling also acts on the surface on which the pressure relief valve is provided, acting as a force for breaking the groove of the pressure relief valve. To do that. That is, as shown in FIG. 4, in the conventional pressure relief valve, the action of breaking the thin portion is based on the pressure applied from the direction perpendicular to the surface of the pressure relief valve. There was no one utilizing deformation of a surface having a large area joined to a surface provided with a valve.
【００１０】ところが、薄型の角型電池においては、電
池内部の圧力の上昇によって一般には、電池の側面であ
る面積が大きな部分が膨らみ、その結果、面積が大きな
部分と垂直に交わる面にも、膨らみによる変形力が作用
する。この変形力を利用するならば内部圧力の上昇によ
って圧力開放弁に作用する圧力とともに、変形力を圧力
開放弁の開裂に利用することができるので、圧力開放弁
の面に垂直方向から作用する圧力のみでは開裂しないよ
うな圧力であっても開裂可能であることを見出したもの
である。However, in a thin prismatic battery, an increase in pressure inside the battery generally causes a portion of the battery having a large area, which is a side surface, to swell. Deformation force due to swelling acts. If this deformation force is used, the pressure acting on the pressure relief valve together with the pressure acting on the pressure relief valve due to the rise of the internal pressure can be utilized for the cleavage of the pressure relief valve, so the pressure acting on the surface of the pressure relief valve from the vertical direction It has been found that it is possible to cleave even at a pressure that does not result in cleavage alone.
【００１１】以下に、図面を参照して説明する。図１
は、本発明の一実施例を説明する図であり、角型電池の
上部を示す図である。角型電池１は、電池缶２内に電池
要素を収容した後に上部の開口部に、電流取り出し端子
３等を設けた電極ヘッダ４をレーザー溶接等の方法によ
って溶接し、電池缶の上部の開口部を密閉した後に、電
解液注入口６から電解液を注入した後に、電解液注入口
を封止して密閉型電池を作製している。電池の使用時に
周囲温度の上昇、過大な電流の取り出し等の場合には、
電池缶内の圧力の上昇がおこる。圧力が上昇すると、電
極ヘッダ４に設けた圧力開放弁５の面に垂直な方向から
圧力が加わると共に、面積が大きな側面７に加わる圧力
によって、面積が大きな側面７が外側へ膨らむ力８が作
用し、両者の力の相乗効果によって圧力開放弁５の溝部
９が開裂することとなる。A description will be given below with reference to the drawings. FIG.
FIG. 2 is a view for explaining one embodiment of the present invention, and is a view showing an upper part of a prismatic battery. After the battery element is accommodated in the battery can 2, the prismatic battery 1 is welded to the upper opening with an electrode header 4 provided with a current extraction terminal 3 and the like by a method such as laser welding. After sealing the part, the electrolyte is injected from the electrolyte inlet 6, and then the electrolyte inlet is sealed to produce a sealed battery. If the ambient temperature rises or excessive current is extracted when using batteries,
The pressure inside the battery can increases. When the pressure increases, pressure is applied from a direction perpendicular to the surface of the pressure release valve 5 provided on the electrode header 4, and a force 8 is applied to the side 7 having a large area to expand outward by the pressure applied to the side 7 having a large area. However, the groove 9 of the pressure release valve 5 is torn by a synergistic effect of the two forces.
【００１２】面積が大きな側面に加わる圧力による変形
によって作用する力は、電極ヘッダ４の面において一様
ではなく、電極ヘッダの面と面積が大きな側面との接合
部１０の近傍であるほど大きな影響を受ける。したがっ
て、電極ヘッダ４に設ける圧力開放弁は、面積が大きな
側面との接合部の近傍に設ける方がより小さな圧力によ
って開裂させることができる。しかも面状の薄肉部では
なく、溝状の薄肉部としたので、電極ヘッダに垂直な方
向の圧力のみではなく面積が大きな側面が変形する力を
薄肉部の開裂に有効に利用することができる。The force exerted by the deformation due to the pressure applied to the side surface having a large area is not uniform on the surface of the electrode header 4, and the greater the force is, the closer to the joint 10 between the surface of the electrode header and the side surface having a large area. Receive. Therefore, when the pressure release valve provided in the electrode header 4 is provided in the vicinity of the joint with the side surface having a large area, the pressure release valve can be cleaved by a smaller pressure. In addition, since the groove-shaped thin portion is used instead of the planar thin portion, not only the pressure in the direction perpendicular to the electrode header but also the force of deforming the side surface having a large area can be effectively used for the cleavage of the thin portion. .
【００１３】圧力開放弁の溝部は、面積が大きな面の膨
張による変形が作用する位置に設けることが必要であ
り、溝の位置は面積が大きな面と圧力開放弁を設けた電
極ヘッダの接合部のごく近傍に設ける方が、変形力が大
きく作用するので好ましい。The groove portion of the pressure release valve must be provided at a position where the deformation due to the expansion of the surface having a large area acts, and the position of the groove is the joint portion between the surface having the large area and the electrode header provided with the pressure release valve. It is preferable to provide them very close to each other because a large deformation force acts.
【００１４】本発明の密閉型電池においては、圧力開放
弁を形成する開裂する平行な２本の溝部は、電極ヘッダ
の、幅が小さな側の接合部に平行な２本の薄肉部から構
成されており、電極ヘッダの接合部に平行な溝は、接合
部から溝部の中心までの距離を０．８ｍｍ〜１．０ｍｍ
とすることが好ましい。溝部の幅は、０．８ｍｍ〜１．
２ｍｍとすることが好ましい。また、溝部の厚みは、厚
みの薄い部分の厚みが０．０２ｍｍ〜０．０３ｍｍとす
ることが好ましい。In the sealed battery according to the present invention, the two parallel grooves to be cleaved forming the pressure release valve are constituted by two thin portions parallel to the joint of the electrode header on the smaller width side. The groove parallel to the joint of the electrode header has a distance from the joint to the center of the groove of 0.8 mm to 1.0 mm.
It is preferable that The width of the groove is 0.8 mm to 1.mm.
Preferably, it is 2 mm. The thickness of the groove is preferably such that the thickness of the thin portion is 0.02 mm to 0.03 mm.
【００１５】また、平行な２本の溝部で形成した薄肉部
の厚みは、それぞれが同じ厚みでなくても良い、また溝
部の薄肉部は断面が急峻な形状とならないように、溝内
に更に肉厚が薄い部分を形成したものでも良く、肉厚の
薄い部分の厚みを０．０２ｍｍ〜０．０３ｍｍとするこ
とによって電池内部の圧力上昇時に比較的低い圧力での
開裂が可能となる。本発明の密閉型電池に使用すること
ができる圧力開放弁の溝部は、エッチング、プレス加工
等によって製造することができる。プレス加工による方
法は製造が容易であり、電極ヘッダの構成部材と一体に
構成することが可能となる。The thickness of the thin portion formed by the two parallel grooves does not have to be the same, and the thin portion of the groove is further provided in the groove so as not to have a steep cross section. A thin portion may be formed. By setting the thickness of the thin portion to 0.02 mm to 0.03 mm, the cell can be cleaved at a relatively low pressure when the pressure inside the battery rises. The groove of the pressure release valve that can be used for the sealed battery of the present invention can be manufactured by etching, pressing, or the like. The method by press working is easy to manufacture, and can be formed integrally with the constituent members of the electrode header.
【００１６】また、プレス加工等のような金属材料の組
織に影響を与える可能性のある方法では、金属組織の硬
化等が生じるためにエッチングした場合に比べて開裂に
は大きな力を要する場合があるため、焼鈍処理を行うこ
とによって開裂圧力の低下を行うことが可能となる。In a method that may affect the structure of a metal material, such as pressing, a larger force may be required for cleavage than in the case of etching due to hardening of the metal structure. Therefore, it is possible to reduce the cleavage pressure by performing the annealing treatment.
【００１７】[0017]
【実施例】以下に、本発明の実施例を示し、本発明を説
明する。 実施例１ 縦５．０ｍｍ、横３０ｍｍ、高さ４０ｍｍ、厚さ０．３
ｍｍの、ニッケルめっき鋼板製の電池缶に、炭素質材料
の組成物を塗布した負極板とマンガン酸リチウムを含む
組成物を塗布した正極板をセパレータを介して巻回した
電池要素を収容し、厚さ０．５ｍｍのステンレス製の電
極ヘッダに、図２（Ａ）に平面図を示し、図２（Ｂ）
に、図２（Ａ）のＡ−Ａ線で切断した部分の一方の溝部
を拡大した断面図を示す圧力開放弁を形成した。 図２
（Ｂ）において、溝部の接合部からの距離ａを１．５ｍ
ｍ、溝の長さｃを６．５ｍｍ、溝の幅ｄを１．０ｍｍ、
薄肉部の厚さｔを０．０２７ｍｍとした。このような平
行な２本の溝状部をプレス加工によって形成した後に、
焼鈍処理した後に圧力開放弁を有する電池ヘッダとし
た。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is described below by showing embodiments of the present invention. Example 1 Height 5.0 mm, width 30 mm, height 40 mm, thickness 0.3
mm, a battery can made of a nickel-plated steel sheet, containing a battery element obtained by winding a negative electrode plate coated with a composition of a carbonaceous material and a positive electrode plate coated with a composition containing lithium manganate via a separator, FIG. 2A shows a plan view of a 0.5 mm-thick stainless steel electrode header, and FIG.
Then, a pressure release valve showing a cross-sectional view in which one groove portion of a portion cut along the line AA in FIG. 2A was enlarged was formed. FIG.
In (B), the distance a from the joint of the groove is 1.5 m.
m, groove length c is 6.5 mm, groove width d is 1.0 mm,
The thickness t of the thin portion was set to 0.027 mm. After forming such two parallel grooves by pressing,
After the annealing treatment, a battery header having a pressure release valve was obtained.
【００１８】電極ヘッダを取り付けた電池缶の底部に穴
を具備した電池要素を収納しない空の電池缶を圧力試験
用の試料１ないし試料５の電池とした。圧力試験用の試
料１ないし試料５の電池を、それぞれの試料に油を注入
して昇圧し、圧力開放弁が開裂して内部の圧力が開放さ
れる圧力を測定し、測定結果を表１に示す。圧力の単位
はいずれもｋｇ／ｃｍ2 である。An empty battery can having no hole and having a hole at the bottom of the battery can with the electrode header attached was used as a sample 1 to sample 5 battery for a pressure test. The batteries of pressure test samples 1 to 5 were pressurized by injecting oil into each sample, and the pressure at which the internal pressure was released when the pressure release valve was opened was measured. The measurement results are shown in Table 1. Show. The unit of pressure is kg / cm 2 .
【００１９】[0019]
【表１】 試料１ 試料２ 試料３ 試料４ 試料５ 平均 ─────────────────────────────────── 開裂圧力 ２２．７ ２４．３ ２２．９ ２３．７ ２３．８ ２３．５[Table 1] Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Average ─────────────────────────────────── Cleavage pressure 22.7 24.3 22.9 23.7 23.8 23.5 23.5
【００２０】[0020]
【発明の効果】本発明の密閉型電池の圧力開放弁は、圧
力開放弁を、面積が大きな面との接合部の近傍に平行な
２本の溝としたので、内部圧力の増大による面積が大き
な面の変形による変形力が作用するので、単に圧力開放
弁の面に垂直な方向からの圧力のみによる圧力開放弁に
比べて小さな圧力によって開裂するので、２本の溝とい
う簡単な構成によって通常使用時の強度の保持特性を従
来水準に維持するとともに電池内部の異常反応が発生し
た場合は、低い圧力での開裂特性を有する密閉型電池を
簡便に得ることができる。According to the pressure release valve of the sealed battery of the present invention, the pressure release valve is formed of two grooves parallel to the vicinity of the junction with the surface having a large area. Since a deforming force due to deformation of a large surface acts, it is split by a small pressure as compared with a pressure release valve only by pressure from a direction perpendicular to the surface of the pressure release valve. In the case where the retention characteristic of the strength during use is maintained at the conventional level and an abnormal reaction occurs inside the battery, a sealed battery having a cleavage characteristic at a low pressure can be easily obtained.
【図１】図１は、本発明の一実施例を説明する図であ
る。FIG. 1 is a diagram for explaining an embodiment of the present invention.
【図２】図２は、本発明の圧力開放弁を設けた位置を説
明する図である。FIG. 2 is a diagram illustrating a position where a pressure release valve of the present invention is provided.
【図３】図３は、圧力開放弁を有する電池を説明する図
である。FIG. 3 is a diagram illustrating a battery having a pressure release valve.
【図４】図４は、電極ヘッダに設ける圧力開放弁を説明
する図である。FIG. 4 is a diagram illustrating a pressure release valve provided on an electrode header.
１…角型電池、２…電池缶、３…電流取り出し端子、４
…電極ヘッダ、５…圧力開放弁、５ａ…面状薄肉部、５
ｂ…対角線状薄肉部、５ｃ…コの字状薄肉部、５ｄ…放
射状薄肉部、５ｅ…馬蹄状薄肉部、６…電解液注入口、
７…面積が大きな側面、８…外側へ膨らむ力、９…溝
部、１０…接合部DESCRIPTION OF SYMBOLS 1 ... Square battery, 2 ... Battery can, 3 ... Current extraction terminal, 4
... Electrode header, 5 ... Pressure release valve, 5a ... Sheet thin part, 5
b: diagonal thin portion, 5c: U-shaped thin portion, 5d: radial thin portion, 5e: horseshoe thin portion, 6: electrolyte inlet,
7: Side surface with large area, 8: Force expanding outward, 9: Groove, 10: Joint
Claims (1)
力開放弁を有する密閉型電池において、面積が大きな面
と面積が小さな面との接合部の近傍の面積が小さな面に
圧力開放弁を有し、圧力開放弁は所定の圧力以上におい
て開裂する薄肉部を有し、薄肉部は接合部に平行な二本
の溝からなり、それぞれの溝は面積が大きな面の変形に
よる変形力が作用する位置に設けたことを特徴とする密
閉型電池。1. A sealed battery having a pressure relief valve for releasing pressure inside the battery by cleavage, wherein the pressure relief valve is provided on a surface having a small area near a junction between a large area and a small area. The pressure release valve has a thin portion that is cleaved at a predetermined pressure or more, and the thin portion is composed of two grooves parallel to the joint, and each groove is subjected to a deformation force due to deformation of a surface having a large area. A sealed battery characterized by being provided at a position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11066054A JP2000260410A (en) | 1999-03-12 | 1999-03-12 | Sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11066054A JP2000260410A (en) | 1999-03-12 | 1999-03-12 | Sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000260410A true JP2000260410A (en) | 2000-09-22 |
Family
ID=13304788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11066054A Pending JP2000260410A (en) | 1999-03-12 | 1999-03-12 | Sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000260410A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002367583A (en) * | 2001-06-05 | 2002-12-20 | Miyama Tool Kk | Sealing plate for sealed battery and its manufacturing method |
| JP2008519406A (en) * | 2004-11-16 | 2008-06-05 | ビーワイディー カンパニー リミテッド | Explosion-proof battery type |
| JP2010165590A (en) * | 2009-01-16 | 2010-07-29 | Toshiba Shomei Precision Kk | Sealing body, battery case body, and sealed battery |
| US7989100B2 (en) | 2005-09-13 | 2011-08-02 | Hitachi Maxell Energy, Ltd. | Sealed prismatic battery |
| WO2018003761A1 (en) * | 2016-06-29 | 2018-01-04 | 三洋電機株式会社 | Secondary battery |
| US11640880B2 (en) | 2017-12-12 | 2023-05-02 | Gs Yuasa International Ltd. | Energy storage device |
-
1999
- 1999-03-12 JP JP11066054A patent/JP2000260410A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002367583A (en) * | 2001-06-05 | 2002-12-20 | Miyama Tool Kk | Sealing plate for sealed battery and its manufacturing method |
| JP2008519406A (en) * | 2004-11-16 | 2008-06-05 | ビーワイディー カンパニー リミテッド | Explosion-proof battery type |
| JP4833218B2 (en) * | 2004-11-16 | 2011-12-07 | ビーワイディー カンパニー リミテッド | Explosion-proof type battery |
| US7989100B2 (en) | 2005-09-13 | 2011-08-02 | Hitachi Maxell Energy, Ltd. | Sealed prismatic battery |
| JP2010165590A (en) * | 2009-01-16 | 2010-07-29 | Toshiba Shomei Precision Kk | Sealing body, battery case body, and sealed battery |
| WO2018003761A1 (en) * | 2016-06-29 | 2018-01-04 | 三洋電機株式会社 | Secondary battery |
| JPWO2018003761A1 (en) * | 2016-06-29 | 2019-04-18 | 三洋電機株式会社 | Secondary battery |
| US10811650B2 (en) | 2016-06-29 | 2020-10-20 | Sanyo Electric Co., Ltd. | Secondary battery |
| JP6996505B2 (en) | 2016-06-29 | 2022-01-17 | 三洋電機株式会社 | Secondary battery |
| US11640880B2 (en) | 2017-12-12 | 2023-05-02 | Gs Yuasa International Ltd. | Energy storage device |
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