JP2002358943A - Battery having safety valve - Google Patents
Battery having safety valveInfo
- Publication number
- JP2002358943A JP2002358943A JP2001165671A JP2001165671A JP2002358943A JP 2002358943 A JP2002358943 A JP 2002358943A JP 2001165671 A JP2001165671 A JP 2001165671A JP 2001165671 A JP2001165671 A JP 2001165671A JP 2002358943 A JP2002358943 A JP 2002358943A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- safety valve
- permanent magnet
- battery
- valve hole
- 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.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内圧が異常に高く
なると開弁する安全弁を備える電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery provided with a safety valve that opens when the internal pressure becomes abnormally high.
【０００２】[0002]
【従来の技術】密閉電池は、たとえば過充電したり大電
流で充放電すると、内圧が異常に高くなることがある。
上昇した内圧は電池を破裂させる原因となる。この弊害
は、電池に安全弁を設けて解消できる。安全弁は、密閉
電池の内圧が設定圧力よりも高くなると開弁する。安全
弁が開弁すると電池内のガスが排出されて内圧上昇は防
止される。2. Description of the Related Art When a sealed battery is overcharged or charged / discharged with a large current, for example, the internal pressure sometimes becomes abnormally high.
The increased internal pressure causes the battery to burst. This problem can be solved by providing a safety valve in the battery. The safety valve opens when the internal pressure of the sealed battery becomes higher than the set pressure. When the safety valve is opened, the gas in the battery is exhausted and the internal pressure is prevented from rising.
【０００３】従来の電池に内蔵される安全弁は、バネや
ゴム等の弾性体で弁体を押圧している。この安全弁は、
弾性体が弁体を押圧する力よりも、内圧で弁体が押され
る力が強くなると開弁する。通常の使用状態では、電池
の内圧は設定圧力よりも低く、弁体は閉弁している。A conventional safety valve built in a battery presses a valve body with an elastic body such as a spring or rubber. This safety valve is
The valve is opened when the force for pushing the valve body by the internal pressure becomes stronger than the force for pushing the valve body by the elastic body. In a normal use state, the internal pressure of the battery is lower than the set pressure, and the valve body is closed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
安全弁は電池内部の温度が急激に上昇して熱暴走し、多
量のガスが発生するときに弁動作が追い付かず、ガスを
スムーズに排出できないことがある。この状態になる
と、安全弁が開弁しているにもかかわらず、内圧はさら
に上昇して封口板が突出することがある。このため、安
全性を充分に高くできないことがある。However, in the conventional safety valve, when the temperature inside the battery rises rapidly and thermal runaway occurs, the valve operation cannot catch up when a large amount of gas is generated, and the gas cannot be discharged smoothly. There is. In this state, the internal pressure may further increase and the sealing plate may protrude even though the safety valve is open. For this reason, safety may not be sufficiently improved.
【０００５】さらに、従来の電池は、安全弁の弁体を永
久磁石の磁気的な吸引力で閉弁する構造も開発されてい
る。たとえば特開平１１−２６５６９９号と特開平４−
１４４０５８号の公報には、永久磁石を使用する安全弁
が記載される。前者の公報には、円板の磁石と凸レンズ
状の磁石とを使用する安全弁が記載される。円板はキュ
ーリー温度を１００℃とするマンガンフェライト焼結体
を、厚さ２ｍｍ、外径４ｍｍ、内径２ｍｍの円板とした
ものである。凸レンズ状の磁石は、バリウムフェライト
プラスチック磁石シートを切断加工して凸レンズ形状と
したものである。この安全弁は、ふたつの磁気的な吸引
力で安全弁を閉弁する。磁石は、温度が上昇すると吸引
力が低下する性質がある。このため、この安全弁は、温
度が高くなると開弁圧が低下する。したがって、電池温
度が高くなると、より低い圧力で安全弁を開弁できる。Further, in the conventional battery, a structure in which the valve element of the safety valve is closed by the magnetic attraction of a permanent magnet has been developed. For example, JP-A-11-265699 and JP-A-4-
No. 144058 discloses a safety valve using a permanent magnet. The former publication describes a safety valve using a disc magnet and a convex lens magnet. The disk is a manganese ferrite sintered body having a Curie temperature of 100 ° C., having a thickness of 2 mm, an outer diameter of 4 mm, and an inner diameter of 2 mm. The convex lens-shaped magnet is obtained by cutting a barium ferrite plastic magnet sheet into a convex lens shape. This safety valve closes the safety valve with two magnetic attraction forces. The magnet has a property that the attractive force decreases as the temperature increases. For this reason, the valve opening pressure of this safety valve decreases as the temperature increases. Therefore, when the battery temperature increases, the safety valve can be opened at a lower pressure.
【０００６】さらに、後者の公報には、開閉サイクルを
向上するために、磁気的な吸引力を利用した安全弁が記
載される。この電池の安全弁は、ラミネート構造の合成
樹脂に未接合部分を設け、ここに一対の磁石、又は磁石
と強磁性体とを積層している。この安全弁は、電池の内
圧が設定圧力よりも高くなって、磁石の吸着力よりも強
くなると開弁する。この安全弁も、温度が高くなると開
弁圧が低下するようにできる。Further, in the latter publication, a safety valve utilizing a magnetic attraction force is described in order to improve an opening / closing cycle. In this battery safety valve, a non-joined portion is provided in a synthetic resin having a laminated structure, and a pair of magnets or a magnet and a ferromagnetic material are laminated here. This safety valve opens when the internal pressure of the battery becomes higher than the set pressure and becomes stronger than the attractive force of the magnet. This safety valve can also reduce the valve opening pressure as the temperature increases.
【０００７】以上のように、磁石の吸引力を利用する安
全弁は、温度と圧力の両方をパラメターとして開弁でき
る。とくに、温度が高くなると開弁する圧力を低くでき
る。このことは、電池の温度が急上昇して熱暴走すると
きに、安全弁を好ましい状態で開弁できる。ただ、以上
の公報に記載される電池の安全弁は、磁気的な吸引力の
みで安全弁の開弁圧を調整するために、種々の使用環境
において、安全弁を理想的な状態では開弁できない。本
発明の第１の目的は、この欠点を解消すること、すなわ
ち圧力と温度の両方で、安全弁をより理想的な状態で開
弁できる電池を提供することにある。As described above, a safety valve utilizing the attraction of a magnet can be opened using both temperature and pressure as parameters. In particular, as the temperature increases, the valve opening pressure can be reduced. This allows the safety valve to be opened in a favorable state when the temperature of the battery rises sharply and the thermal runaway occurs. However, in the battery safety valve described in the above publication, the safety valve cannot be opened in an ideal state in various use environments because the valve opening pressure of the safety valve is adjusted only by magnetic attraction. A first object of the present invention is to eliminate this drawback, that is, to provide a battery that can open a safety valve in a more ideal state under both pressure and temperature.
【０００８】さらに、磁石の吸引力で閉弁される安全弁
は、長期間にわたって安全弁の開弁圧力を一定に保持す
るのが難しい。とくに、以上の公報に記載される安全弁
は、組み立てた状態で磁石を励磁して磁化させるので、
磁石を磁気シールドできない。このため、電池を使用す
るときに強力な磁石が接近すると、磁石の磁力が変化し
て安全弁の開弁圧が狂ってしまう欠点がある。安全弁の
開弁圧が著しく低下すると、もはや電池として使用でき
なくなる。また、安全弁の開弁圧が高くなっても、安全
に使用できなくなる。本発明の第２の目的は、この欠点
を解消すること、すなわち長期間にわたって、さらに種
々の環境で使用されて、安全弁を正確な圧力で開弁でき
る電池を提供することにある。Further, it is difficult for a safety valve that is closed by the attraction of a magnet to keep the opening pressure of the safety valve constant over a long period of time. In particular, the safety valve described in the above publication excites and magnetizes a magnet in an assembled state,
The magnet cannot be magnetically shielded. For this reason, when a strong magnet approaches when using the battery, there is a disadvantage that the magnetic force of the magnet changes and the valve opening pressure of the safety valve is changed. If the valve opening pressure of the safety valve is significantly reduced, it can no longer be used as a battery. Further, even if the valve opening pressure of the safety valve increases, it cannot be used safely. A second object of the present invention is to eliminate this drawback, that is, to provide a battery which can be used for a long period of time and in various environments to open a safety valve at an accurate pressure.
【０００９】さらに、以上の公報に記載される安全弁
は、磁束が外部に漏れるばかりでなく、磁力を有効に利
用して弁体を閉弁できない欠点がある。電池から漏れる
磁束はフレキシブルディスク等の磁気記憶媒体に極めて
悪い影響を与える。また、金属と一緒に収納するときに
金属を吸着して＋−の電極をショートさせる原因とな
る。さらに、磁力を有効に利用できないことは、磁力に
よる閉弁作用を低下させる。このため、安全弁が所定の
圧力まで開弁しないようにするために、磁石を強くする
か大きくする必要があり、また弁体が閉塞する安全弁の
弁孔を小さくする必要がある。小さい弁孔の安全弁は、
内圧が異常に上昇したときに速やかに内部のガスを排気
できない。このため、急激な内圧上昇を解消できず電池
を破壊させる原因となる。本発明の第３の目的は、この
弊害を解消すること、すなわち電池外部への磁気漏れを
極減すると共に、磁力を有効に利用して永久磁石でもっ
て弁孔を確実に設定圧力まで閉弁できる安全弁を備えた
電池を提供することにある。Further, the safety valve described in the above-mentioned publications has the disadvantage that not only the magnetic flux leaks to the outside but also the valve body cannot be closed by effectively utilizing the magnetic force. The magnetic flux leaking from the battery has a very bad effect on a magnetic storage medium such as a flexible disk. In addition, when stored together with the metal, the metal is adsorbed to cause a short circuit of the + and-electrodes. Further, the inability to effectively use the magnetic force reduces the valve closing action due to the magnetic force. For this reason, in order to prevent the safety valve from opening to a predetermined pressure, it is necessary to strengthen or enlarge the magnet, and it is necessary to reduce the valve hole of the safety valve in which the valve element closes. The safety valve with a small valve hole
When the internal pressure rises abnormally, the internal gas cannot be quickly exhausted. For this reason, a rapid increase in the internal pressure cannot be eliminated, which causes the battery to be destroyed. A third object of the present invention is to eliminate this adverse effect, that is, to minimize the magnetic leakage to the outside of the battery, and to effectively close the valve hole to the set pressure with a permanent magnet by effectively utilizing the magnetic force. An object of the present invention is to provide a battery provided with a safety valve that can be used.
【００１０】[0010]
【課題を解決するための手段】本発明の電池は、電池の
内圧が設定圧力よりも高くなると開弁する安全弁３を備
える。安全弁３は、蓋ケース８に収納される弾性体４及
び永久磁石５と、弾性体４の弾性力と永久磁石５の磁気
的な吸引力で開閉する弁孔６Ａを有する弁孔プレート６
とを備える。弁孔プレート６及び蓋ケース８は各々強磁
性体で構成されており、永久磁石５の磁束が蓋ケース８
及び弁孔プレート６により閉磁気回路をループするよう
にしている。さらに、永久磁石５は、弁孔６Ａを開閉す
る力が温度上昇と共に低下する熱減磁特性を有してい
る。The battery according to the present invention includes a safety valve 3 that opens when the internal pressure of the battery becomes higher than a set pressure. The safety valve 3 includes an elastic body 4 and a permanent magnet 5 housed in a lid case 8, and a valve hole plate 6 having a valve hole 6 </ b> A that opens and closes with the elastic force of the elastic body 4 and the magnetic attraction force of the permanent magnet 5.
And The valve hole plate 6 and the lid case 8 are each made of a ferromagnetic material, and the magnetic flux of the permanent magnet 5 is
And the valve hole plate 6 loops the closed magnetic circuit. Further, the permanent magnet 5 has a thermal demagnetization characteristic in which a force for opening and closing the valve hole 6A decreases with an increase in temperature.
【００１１】弁孔プレート６は、封口板２とすることが
できる。安全弁３は、弁孔６Ａを開閉する弁体７を設け
ることができる。この弁体７は、永久磁石５とすること
ができる。永久磁石５である弁体７は、好ましくは、弁
座１０との接触面にゴム状弾性体層１１を設ける。弾性
体４は、押しバネ、あるいはゴム状弾性体とすることが
できる。さらに、弁体７は、弾性変形するゴム磁石１２
として、弾性体と永久磁石とを一体構造としたものとす
ることもできる。弁孔プレート６と蓋ケース８は、鉄板
とすることができる。鉄板である弁孔プレート６と蓋ケ
ース８は、好ましくは、腐食しないように表面を金属メ
ッキする。永久磁石５の熱減磁率は、好ましくは、０．
１％／℃よりも大きくする。The valve hole plate 6 can be the sealing plate 2. The safety valve 3 can be provided with a valve element 7 that opens and closes the valve hole 6A. This valve element 7 can be a permanent magnet 5. The valve body 7, which is the permanent magnet 5, preferably has a rubber-like elastic body layer 11 on the contact surface with the valve seat 10. The elastic body 4 can be a pressing spring or a rubber-like elastic body. Further, the valve element 7 includes a rubber magnet 12 that is elastically deformed.
Alternatively, the elastic body and the permanent magnet may be integrally formed. The valve hole plate 6 and the lid case 8 can be iron plates. The valve hole plate 6 and the lid case 8, which are iron plates, are preferably metal-plated on the surface to prevent corrosion. The thermal demagnetization rate of the permanent magnet 5 is preferably set at 0.
Make it greater than 1% / ° C.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施例を図面に基
づいて説明する。ただし、以下に示す実施例は、本発明
の技術思想を具体化するための電池を例示するものであ
って、本発明は電池を以下のものに特定しない。Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a battery for embodying the technical idea of the present invention, and the present invention does not limit the battery to the following.
【００１３】さらに、この明細書は、特許請求の範囲を
理解しやすいように、実施例に示される部材に対応する
番号を、「特許請求の範囲の欄」、および「課題を解決
するための手段の欄」に示される部材に付記している。
ただ、特許請求の範囲に示される部材を、実施例の部材
に特定するものでは決してない。Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.
【００１４】図１に示す電池は、外装缶１の開口部を安
全弁３を備える封口板２で閉塞している。安全弁３は、
電池の内圧が設定圧力よりも低いときに閉弁し、設定圧
力よりも高くなると開弁する。設定圧力は、外装缶１を
破裂させない圧力に設定される。開弁した安全弁３は、
外装缶１の内部のガスを排気して内圧を低下させる。In the battery shown in FIG. 1, an opening of an outer can 1 is closed by a sealing plate 2 provided with a safety valve 3. Safety valve 3
The valve closes when the internal pressure of the battery is lower than the set pressure, and opens when the internal pressure of the battery becomes higher than the set pressure. The set pressure is set to a pressure that does not cause the outer can 1 to burst. The opened safety valve 3
The gas inside the outer can 1 is exhausted to reduce the internal pressure.
【００１５】図２の断面図に示す安全弁３は、弾性体４
であるバネの押圧力と、永久磁石５の磁気的な吸引力の
両方で弁体７を閉弁する。この図の安全弁３は、弁孔６
Ａを開口している弁孔プレート６と、この弁孔プレート
６の弁孔６Ａに密着されて閉弁する弁体７と、この弁体
７を閉弁状態に保持する弾性体４であるバネと、さらに
弁体７を磁気的な吸引力で閉弁状態に保持する永久磁石
５と、弁孔プレート６に連結されて、内部に弁体７と弾
性体４と永久磁石５を内蔵する蓋ケース８とを備えてい
る。図の安全弁３は、弁体７を永久磁石５で構成してい
るが、弁体と永久磁石は、別部材とすることもできる。The safety valve 3 shown in the sectional view of FIG.
The valve body 7 is closed by both the pressing force of the spring and the magnetic attractive force of the permanent magnet 5. The safety valve 3 shown in FIG.
A, a valve hole plate 6 having an opening A, a valve body 7 that is in close contact with a valve hole 6A of the valve hole plate 6, and a valve body 7, and a spring that is an elastic body 4 that holds the valve body 7 in a closed state. A permanent magnet 5 for holding the valve body 7 closed by magnetic attraction, and a lid connected to the valve hole plate 6 and having the valve body 7, the elastic body 4 and the permanent magnet 5 built therein. And a case 8. In the illustrated safety valve 3, the valve element 7 is configured by the permanent magnet 5, but the valve element and the permanent magnet may be separate members.
【００１６】図１の電池は、封口板２に安全弁３を設け
ているので、弁孔プレート６を封口板２とする。弁孔プ
レート６は、弁体７で開閉される弁孔６Ａを開口してお
り、弁孔６Ａの周囲は弁座１０となって弁体７が気密に
接触される。図の電池は、安全弁３を封口板２に設けて
いるが、安全弁は必ずしも封口板に設ける必要はない。
たとえば、図示しないが、開口部の底プレートに設ける
こともできる。この電池は、弁孔プレートを外装缶の底
プレートとする。弁孔プレート６である封口板２は、電
池の外装缶１の開口部に、かしめ加工またはレーザー溶
接等の方法で気密に閉塞している。さらに、この弁孔プ
レート６は、安全弁３に内蔵される永久磁石５の閉磁気
回路を構成するので強磁性体で製作される。In the battery shown in FIG. 1, the safety valve 3 is provided on the sealing plate 2, so that the valve hole plate 6 is used as the sealing plate 2. The valve hole plate 6 opens a valve hole 6A that is opened and closed by the valve body 7, and the periphery of the valve hole 6A becomes a valve seat 10 so that the valve body 7 is in airtight contact. In the illustrated battery, the safety valve 3 is provided on the sealing plate 2, but the safety valve does not necessarily need to be provided on the sealing plate.
For example, although not shown, it may be provided on the bottom plate of the opening. In this battery, the valve hole plate is used as the bottom plate of the outer can. The sealing plate 2 serving as the valve hole plate 6 is airtightly closed at the opening of the battery outer can 1 by a method such as caulking or laser welding. Further, since the valve hole plate 6 forms a closed magnetic circuit of the permanent magnet 5 built in the safety valve 3, it is made of a ferromagnetic material.
【００１７】永久磁石５は、Ｎ極とＳ極の間に磁束が発
生する。この磁束を外部に漏らさないために、図２の安
全弁３は、蓋ケース８と弁孔プレート６とで磁束の閉磁
気回路を形成している。したがって、蓋ケース８も強磁
性体で製作している。弁孔プレート６と蓋ケース８は強
磁性体である鉄板で製作している。鉄板は、腐食しない
ように表面を金属メッキしている。金属メッキは、ニッ
ケルメッキが適している。ただ、強磁性体であるステン
レス等の金属板で弁孔プレート６と蓋ケース８を製作す
ることもできる。The permanent magnet 5 generates a magnetic flux between the N pole and the S pole. In order to prevent this magnetic flux from leaking to the outside, the safety valve 3 of FIG. 2 forms a closed magnetic circuit of the magnetic flux with the lid case 8 and the valve hole plate 6. Therefore, the lid case 8 is also made of a ferromagnetic material. The valve hole plate 6 and the lid case 8 are made of a ferromagnetic iron plate. The surface of the iron plate is metal-plated to prevent corrosion. Nickel plating is suitable for metal plating. However, the valve hole plate 6 and the lid case 8 can be made of a metal plate of a ferromagnetic material such as stainless steel.
【００１８】蓋ケース８は、上面を閉塞している筒状に
成形して、開口部の周縁に鍔８Ａを設けている。鍔８Ａ
を弁孔プレート６の上面に溶接等の方法で固定して、弁
体７と弾性体４と永久磁石５を内蔵する収納部９を形成
している。この安全弁３は、永久磁石５から外部に漏れ
る磁束を、蓋ケース８と弁孔プレート６に通過させる。
すなわち、永久磁石５の磁束は、図の鎖線で示すよう
に、永久磁石５→蓋ケース８→弁孔プレート６→永久磁
石５とループして、閉鎖された閉磁気回路を通過する。
蓋ケース８は、内面を永久磁石５の外側に接近させてい
る。永久磁石５と蓋ケース８との隙間を狭くして、この
隙間を通過する磁束の磁気抵抗を小さくするためであ
る。強磁性体に比較して空気の磁気抵抗は大きいので、
隙間を広くすると、永久磁石５と蓋ケース８との隙間を
通過する磁束の磁気抵抗が大きくなる。磁気抵抗を小さ
くすることからは、永久磁石５と蓋ケース８内面との隙
間を狭くするのがよいが、この隙間が狭すぎると、永久
磁石５を蓋ケース８の内部でスムーズに往復運動させる
のが難しくなる。このため、蓋ケース８の内面と永久磁
石５との隙間は、永久磁石５をスムーズに往復運動で
き、かつ磁束密度をできる限り小さくするようにする。The lid case 8 is formed in a cylindrical shape whose upper surface is closed, and a flange 8A is provided on the periphery of the opening. Tsuba 8A
Is fixed to the upper surface of the valve hole plate 6 by a method such as welding or the like, thereby forming a housing 9 in which the valve body 7, the elastic body 4 and the permanent magnet 5 are incorporated. The safety valve 3 allows the magnetic flux leaking from the permanent magnet 5 to the outside to pass through the lid case 8 and the valve hole plate 6.
That is, the magnetic flux of the permanent magnet 5 loops through the permanent magnet 5, the lid case 8, the valve hole plate 6, and the permanent magnet 5 as shown by a chain line in the figure, and passes through a closed magnetic circuit.
The lid case 8 has an inner surface approaching the outside of the permanent magnet 5. This is because the gap between the permanent magnet 5 and the lid case 8 is narrowed to reduce the magnetic resistance of the magnetic flux passing through the gap. Since the magnetic resistance of air is larger than that of ferromagnetic materials,
When the gap is widened, the magnetic resistance of the magnetic flux passing through the gap between the permanent magnet 5 and the lid case 8 increases. In order to reduce the magnetic resistance, the gap between the permanent magnet 5 and the inner surface of the lid case 8 is preferably narrowed. However, if the gap is too narrow, the permanent magnet 5 is smoothly reciprocated inside the lid case 8. It becomes difficult. For this reason, the gap between the inner surface of the lid case 8 and the permanent magnet 5 allows the permanent magnet 5 to reciprocate smoothly and the magnetic flux density to be as small as possible.
【００１９】図２に示す安全弁３は、弾性体４をコイル
スプリングとしている。この構造の安全弁３は、コイル
スプリングをバネ鋼等の強磁性体で製作することができ
る。この安全弁３は、永久磁石５の磁束を弾性体４に通
過させることができる。したがって、永久磁石５の磁束
を、永久磁石５→弾性体４→蓋ケース８→弁孔プレート
６→永久磁石５の閉鎖されたループに通過できる。弾性
体４は、永久磁石５に直接に接触しているので、永久磁
石５の磁束を効率よく導くことができる。したがって、
この構造の安全弁３は、必ずしも蓋ケース８の内面を永
久磁石５に接近させる必要がない。永久磁石５の磁束が
弾性体４を介して蓋ケース８に導かれるからである。The safety valve 3 shown in FIG. 2 uses the elastic body 4 as a coil spring. In the safety valve 3 having this structure, the coil spring can be made of a ferromagnetic material such as spring steel. The safety valve 3 allows the magnetic flux of the permanent magnet 5 to pass through the elastic body 4. Therefore, the magnetic flux of the permanent magnet 5 can pass through the closed loop of the permanent magnet 5 → the elastic body 4 → the lid case 8 → the valve hole plate 6 → the permanent magnet 5. Since the elastic body 4 is in direct contact with the permanent magnet 5, the magnetic flux of the permanent magnet 5 can be efficiently guided. Therefore,
In the safety valve 3 having this structure, it is not always necessary to bring the inner surface of the lid case 8 close to the permanent magnet 5. This is because the magnetic flux of the permanent magnet 5 is guided to the lid case 8 via the elastic body 4.
【００２０】図の安全弁３は、弁体７を永久磁石５で構
成している。弁体７である永久磁石５は、弁座１０の接
触面にゴム状弾性体層１１を設けている。この弁体７
は、永久磁石５の吸引力と弾性体４の押圧力でゴム状弾
性体層１１を弁座１０に押し付けて閉弁される。永久磁
石５は、弁座１０と対向する面とその反対面とが異なる
磁極となるように磁化している。図の安全弁３は、永久
磁石５の下方に弁座１０を配設しているので、永久磁石
５の上下面が異なる磁極となるように永久磁石５を磁化
している。In the illustrated safety valve 3, the valve element 7 is constituted by a permanent magnet 5. The permanent magnet 5 serving as the valve element 7 has a rubber-like elastic layer 11 provided on the contact surface of the valve seat 10. This valve element 7
Is closed by pressing the rubber-like elastic body layer 11 against the valve seat 10 by the attraction force of the permanent magnet 5 and the pressing force of the elastic body 4. The permanent magnet 5 is magnetized such that the surface facing the valve seat 10 and the opposite surface have different magnetic poles. In the illustrated safety valve 3, since the valve seat 10 is disposed below the permanent magnet 5, the permanent magnet 5 is magnetized so that the upper and lower surfaces of the permanent magnet 5 have different magnetic poles.
【００２１】弾性体４は、強磁性体のバネ鋼で製作して
いるコイルバネの押しバネである。この弾性体４は、所
定の圧力で弁体７を弁座１０に押し付けている。弾性体
４には、強磁性体以外の金属線で製作することもでき
る。また、弾性体４は、図３に示すように、ゴム状弾性
体で製作することもできる。弾性体４を強磁性体としな
い安全弁３は、永久磁石５と蓋ケース８を接近させて、
永久磁石５の磁束を効率よく蓋ケース８に導くようにす
る。さらに、図４に示すように、弁体７を弾性変形する
ゴム磁石１２として、永久磁石と弁体と弾性体を一体構
造とすることもできる。The elastic body 4 is a compression spring of a coil spring made of ferromagnetic spring steel. The elastic body 4 presses the valve body 7 against the valve seat 10 at a predetermined pressure. The elastic body 4 may be made of a metal wire other than a ferromagnetic body. Further, as shown in FIG. 3, the elastic body 4 can be made of a rubber-like elastic body. The safety valve 3 that does not use the elastic body 4 as a ferromagnetic material brings the permanent magnet 5 and the lid case 8 close to each other,
The magnetic flux of the permanent magnet 5 is efficiently guided to the lid case 8. Further, as shown in FIG. 4, a permanent magnet, a valve body, and an elastic body may be integrally formed as the rubber magnet 12 for elastically deforming the valve body 7.
【００２２】永久磁石５は、磁気的な磁束密度で弁体７
を弁座１０に押圧する吸引力を調整できる。永久磁石５
が弁体７を押圧する磁気押圧力と、弾性体４が弁体７を
弁座１０に押圧する弾性押圧力は、その比率を調整し
て、弁体７を開弁させる設定圧力を、温度をパラメター
として最適値に設定できる。磁気押圧力の比率を高くす
ると、温度に対する設定圧力の変化を大きくできる。す
なわち、設定圧力を、温度が上昇するにしたがってより
低く補正できる。反対に磁気押圧力の比率を小さくする
と、温度に対する設定圧力の変化は小さくなる。弾性押
圧力に対する磁気押圧力の比率は、電池のタイプや使用
環境、さらに外装缶１の強度等を考慮して最適値に設定
され、たとえば、常温において、磁気押圧力／弾性押圧
力の比率を、０．１〜４、好ましくは０．２〜３％に設
定される。図５は、温度によって安全弁が開弁する設定
圧力が変化する状態を示すグラフである。このグラフ
は、安全弁の磁気押圧力／弾性押圧力を１としている
が、この比率を変更して温度に対する設定の変化率を調
整できる。The permanent magnet 5 has a magnetic flux density,
To the valve seat 10 can be adjusted. Permanent magnet 5
The magnetic pressing force for pressing the valve body 7 and the elastic pressing force for pressing the valve body 7 against the valve seat 10 by the elastic body 4 adjusts the ratio so that the set pressure for opening the valve body 7 is set to the temperature. Can be set as an optimal value as a parameter. When the ratio of the magnetic pressing force is increased, the change in the set pressure with respect to the temperature can be increased. That is, the set pressure can be corrected lower as the temperature increases. Conversely, when the ratio of the magnetic pressing force is reduced, the change in the set pressure with respect to the temperature is reduced. The ratio of the magnetic pressing force to the elastic pressing force is set to an optimum value in consideration of the type of the battery, the usage environment, the strength of the outer can 1, and the like. , 0.1 to 4, preferably 0.2 to 3%. FIG. 5 is a graph showing a state in which the set pressure at which the safety valve opens changes depending on the temperature. In this graph, the magnetic pressing force / elastic pressing force of the safety valve is set to 1, but by changing this ratio, the rate of change of the setting with respect to the temperature can be adjusted.
【００２３】さらに、温度が上昇して磁気押圧力が低下
する割合は、永久磁石５の熱減磁率によっても調整でき
る。永久磁石５の熱減磁率は、電池の温度が高くなると
設定圧力を好ましい状態で低くできるように、０．１％
／℃よりも大きくする。Further, the rate at which the temperature increases and the magnetic pressing force decreases can also be adjusted by the thermal demagnetization rate of the permanent magnet 5. The thermal demagnetization rate of the permanent magnet 5 is set to 0.1% so that the set pressure can be reduced in a preferable state when the battery temperature increases.
/ ° C.
【００２４】[0024]
【発明の効果】本発明の電池は、圧力と温度の両方で、
安全弁をより理想的な状態で開弁できる特長がある。そ
れは、本発明の電池の安全弁が弾性体と永久磁石とを備
え、弾性体と永久磁石の両方で弁体を閉弁状態に保持し
ているからである。本発明の電池は、従来の電池のよう
に、永久磁石の磁気的な吸引力のみで安全弁の開弁圧を
調整しない。本発明の電池は、弾性体と永久磁石の両方
で、安全弁の開弁圧を調整するので、圧力と温度の両方
で、安全弁をより理想的に開弁できる。The battery of the present invention can be used for both pressure and temperature.
The feature is that the safety valve can be opened in a more ideal state. This is because the battery safety valve of the present invention includes an elastic body and a permanent magnet, and the valve body is kept closed by both the elastic body and the permanent magnet. Unlike the conventional battery, the battery of the present invention does not adjust the valve opening pressure of the safety valve only by the magnetic attraction of the permanent magnet. Since the battery of the present invention adjusts the opening pressure of the safety valve with both the elastic body and the permanent magnet, the safety valve can be more ideally opened with both pressure and temperature.
【００２５】さらに、本発明の電池の特筆すべき特長
は、安全弁が、内蔵される永久磁石の磁気をシールドで
きることである。本発明の電池の安全弁は、強磁性体で
ある弁孔プレートと蓋ケースで形成してなる閉磁気回路
内に永久磁石を内蔵して、永久磁石の磁束が閉磁気回路
をループするようにしている。このため、内蔵される永
久磁石を磁気シールドして、電池外部から受ける磁気の
影響や電池外部への磁気漏れを極減できる。したがっ
て、本発明の電池は、外部から受ける磁気の影響で永久
磁石の磁力が変化して安全弁の開弁圧が狂うのを有効に
防止して、種々の環境で使用しても安全弁を正確な圧力
で開弁できる特長がある。さらに、本発明の電池は、外
部への磁気漏れを有効に防止できるので、周辺機器や磁
気記憶媒体等への悪影響を極減できると共に、磁力を有
効に作用させて弁孔を確実に設定圧力まで閉弁できる特
長がある。磁力を有効に利用できる安全弁は、永久磁石
を必要以上に強くすることなく、また、安全弁の弁孔を
小さくする必要がない。したがって、安価な磁石を使用
できると共に、弁孔を大きく設計して、急激な内圧上昇
時に速やかに内部のガスを排気できる。Further, a remarkable feature of the battery of the present invention is that the safety valve can shield the magnetism of the built-in permanent magnet. The safety valve of the battery of the present invention incorporates a permanent magnet in a closed magnetic circuit formed by a valve hole plate and a lid case, which are ferromagnetic, so that the magnetic flux of the permanent magnet loops through the closed magnetic circuit. I have. For this reason, the built-in permanent magnet is magnetically shielded, and the influence of magnetism from the outside of the battery and the magnetic leakage to the outside of the battery can be extremely reduced. Therefore, the battery of the present invention effectively prevents the magnetic force of the permanent magnet from changing due to the influence of magnetism from the outside and the valve opening pressure of the safety valve from going out of order, so that the safety valve can be accurately used even in various environments. The valve can be opened by pressure. Further, since the battery of the present invention can effectively prevent magnetic leakage to the outside, it is possible to minimize adverse effects on peripheral devices and magnetic storage media, etc., and to effectively apply magnetic force to reliably set the valve hole at the set pressure. The valve can be closed up to The safety valve that can effectively use the magnetic force does not need to make the permanent magnet stronger than necessary and does not need to make the valve hole of the safety valve small. Therefore, an inexpensive magnet can be used, and the valve hole is designed to be large, so that the gas inside can be quickly exhausted when the internal pressure rises sharply.
【図１】本発明の一実施例にかかる安全弁を備える電池
の断面図FIG. 1 is a cross-sectional view of a battery provided with a safety valve according to one embodiment of the present invention.
【図２】図１に示す電池の安全弁の拡大断面図FIG. 2 is an enlarged cross-sectional view of the battery safety valve shown in FIG.
【図３】安全弁の他の一例を示す拡大断面図FIG. 3 is an enlarged sectional view showing another example of the safety valve.
【図４】安全弁の他の一例を示す拡大断面図FIG. 4 is an enlarged sectional view showing another example of the safety valve.
【図５】安全弁が開弁する設定圧力と温度の関係を示す
グラフFIG. 5 is a graph showing a relationship between a set pressure at which the safety valve opens and a temperature.
１…外装缶 ２…封口板 ３…安全弁 ４…弾性体 ５…永久磁石 ６…弁孔プレート ６Ａ…弁孔 ７…弁体 ８…蓋ケース ８Ａ…鍔 ９…収納部 １０…弁座 １１…ゴム状弾性体層 １２…ゴム磁石 DESCRIPTION OF SYMBOLS 1 ... Exterior can 2 ... Sealing plate 3 ... Safety valve 4 ... Elastic body 5 ... Permanent magnet 6 ... Valve hole plate 6A ... Valve hole 7 ... Valve body 8 ... Lid case 8A ... Flange 9 ... Storage part 10 ... Valve seat 11 ... Rubber Elastic layer 12: rubber magnet
フロントページの続き Ｆターム(参考） 5H012 AA01 BB02 DD06 EE00 EE04 EE09 FF00 FF08 GG05 GG07 GG09 JJ10 Continued on the front page F term (reference) 5H012 AA01 BB02 DD06 EE00 EE04 EE09 FF00 FF08 GG05 GG07 GG09 JJ10
Claims (10)
開弁する安全弁(3)を備える電池であって、 安全弁(3)は、蓋ケース(8)に収納される弾性体(4)及び
永久磁石(5)と、弾性体(4)の弾性力と永久磁石(5)の磁
気的な吸引力で開閉する弁孔(6A)を有した弁孔プレート
(6)とを備え、 弁孔プレート(6)及び蓋ケース(8)は各々強磁性体で構成
されて、永久磁石(5)の磁束が蓋ケース(8)及び弁孔プレ
ート(6)により閉磁気回路をループし、かつ、永久磁石
(5)は、弁孔(6A)を開閉する力が温度上昇と共に低下す
る熱減磁特性を有していることを特徴とする安全弁を備
える電池。A battery provided with a safety valve (3) that opens when the internal pressure of the battery becomes higher than a set pressure, wherein the safety valve (3) includes an elastic body (4) housed in a lid case (8) and A valve hole plate having a permanent magnet (5) and a valve hole (6A) that opens and closes with the elastic force of the elastic body (4) and the magnetic attraction force of the permanent magnet (5)
The valve hole plate (6) and the lid case (8) are each made of a ferromagnetic material, and the magnetic flux of the permanent magnet (5) is controlled by the lid case (8) and the valve hole plate (6). Loop closed magnetic circuit and permanent magnet
(5) A battery provided with a safety valve, wherein the battery has a thermal demagnetization characteristic in which a force for opening and closing the valve hole (6A) decreases with an increase in temperature.
項１に記載される安全弁を備える密閉電池。2. A sealed battery provided with a safety valve according to claim 1, wherein the valve hole plate (6) is a sealing plate (2).
ており、この弁体(7)が永久磁石(5)である請求項１に記
載される安全弁を備える密閉電池。3. A sealed battery equipped with a safety valve according to claim 1, further comprising a valve element (7) for opening and closing the valve hole (6A), wherein the valve element (7) is a permanent magnet (5). .
性体層(11)を設けている永久磁石(5)である請求項３に
記載される安全弁を備える密閉電池。4. A hermetic seal provided with a safety valve according to claim 3, wherein the valve element (7) is a permanent magnet (5) provided with a rubbery elastic layer (11) on the contact surface of the valve seat (10). battery.
記載される安全弁を備える密閉電池。5. A sealed battery provided with the safety valve according to claim 1, wherein the elastic body (4) is a push spring.
１に記載される安全弁を備える密閉電池。6. A sealed battery provided with a safety valve according to claim 1, wherein the elastic body (4) is a rubber-like elastic body.
ており、この弁体(7)が弾性変形するゴム磁石(12)で、
このゴム磁石(12)は、弾性体と永久磁石を一体構造とし
たものである請求項１に記載される安全弁を備える密閉
電池。7. A valve element (7) for opening and closing a valve hole (6A) is provided. The valve element (7) is a rubber magnet (12) that is elastically deformed.
The sealed battery provided with a safety valve according to claim 1, wherein the rubber magnet (12) has an integral structure of an elastic body and a permanent magnet.
ある請求項１に記載される安全弁を備える密閉電池。8. A sealed battery provided with the safety valve according to claim 1, wherein the valve hole plate (6) and the lid case (8) are iron plates.
ッキした鉄板である請求項８に記載される安全弁を備え
る密閉電池。9. A sealed battery comprising a safety valve according to claim 8, wherein the valve hole plate (6) and the lid case (8) are iron plates plated with metal.
℃よりも大きい請求項１に記載される安全弁を備える密
閉電池。10. The thermal demagnetization rate of the permanent magnet (5) is 0.1% /
A sealed battery provided with the safety valve according to claim 1, which is higher than ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001165671A JP2002358943A (en) | 2001-05-31 | 2001-05-31 | Battery having safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001165671A JP2002358943A (en) | 2001-05-31 | 2001-05-31 | Battery having safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002358943A true JP2002358943A (en) | 2002-12-13 |
Family
ID=19008314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001165671A Withdrawn JP2002358943A (en) | 2001-05-31 | 2001-05-31 | Battery having safety valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002358943A (en) |
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| JP2009150451A (en) * | 2007-12-19 | 2009-07-09 | Tokai Rubber Ind Ltd | Fluid encapsulated type vibration isolating device |
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| JP2009138847A (en) * | 2007-12-06 | 2009-06-25 | Tokai Rubber Ind Ltd | Fluid-sealed vibration control device |
| JP2009150451A (en) * | 2007-12-19 | 2009-07-09 | Tokai Rubber Ind Ltd | Fluid encapsulated type vibration isolating device |
| KR101049820B1 (en) | 2008-08-04 | 2011-07-15 | 삼성에스디아이 주식회사 | Secondary battery |
| US8216707B2 (en) | 2008-08-04 | 2012-07-10 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| WO2011131140A1 (en) * | 2010-04-23 | 2011-10-27 | Byd Company Limited | Explosion-proof device and power battery and battery module comprising the same |
| KR101863091B1 (en) | 2011-11-24 | 2018-06-01 | 삼성에스디아이 주식회사 | Secondary battery |
| KR20130057756A (en) * | 2011-11-24 | 2013-06-03 | 삼성에스디아이 주식회사 | Secondary battery |
| US10103371B2 (en) | 2015-12-25 | 2018-10-16 | Industrial Technology Research Institute | Actuating structure of battery safety valve |
| KR20190042794A (en) * | 2017-10-17 | 2019-04-25 | 주식회사 엘지화학 | Cap Assembly Comprising Magnet |
| KR102392645B1 (en) * | 2017-10-17 | 2022-04-29 | 주식회사 엘지에너지솔루션 | Cap Assembly Comprising Magnet |
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| CN113782881A (en) * | 2021-09-15 | 2021-12-10 | 安徽庐江凯胜新能源科技有限公司 | Battery cover plate structure for realizing multiple open circuit protection and pressure release |
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