JP3943063B2 - Sealing plate and sealed battery - Google Patents

Sealing plate and sealed battery Download PDF

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JP3943063B2
JP3943063B2 JP2003301087A JP2003301087A JP3943063B2 JP 3943063 B2 JP3943063 B2 JP 3943063B2 JP 2003301087 A JP2003301087 A JP 2003301087A JP 2003301087 A JP2003301087 A JP 2003301087A JP 3943063 B2 JP3943063 B2 JP 3943063B2
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valve
plate
groove
outer peripheral
peripheral edge
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JP2005071836A (en
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睦 中沢
憲一 中林
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東芝照明プレシジョン株式会社
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Priority to KR1020040051074A priority patent/KR100649784B1/en
Priority to CNB2004100621041A priority patent/CN1303703C/en
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    • 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
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • 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

Description

本発明は、容器内部の圧力を逃す弁を備える封口板及び密閉型電池に関する。   The present invention relates to a sealing plate having a valve for releasing the pressure inside a container and a sealed battery.

容器内部の圧力が過大となった場合に内部のガスを放出する弁（圧力逃し弁）機能を封口板に設ける密閉型電池がある（例えば、特許文献１参照。）。弁は、封口板の一部に板厚を減厚して設けられた凹部と、凹部の底面上に中心から対称に配置される２つの膨出部と、凹部の底面の中央部から境界近傍（縁部近傍）まで延在して２つの膨出部をそれぞれ囲繞する溝とで構成されている。   There is a sealed battery in which a sealing plate is provided with a valve (pressure relief valve) function that discharges internal gas when the pressure inside the container becomes excessive (see, for example, Patent Document 1). The valve has a concave portion formed by reducing the thickness of a part of the sealing plate, two bulging portions disposed symmetrically from the center on the bottom surface of the concave portion, and the vicinity of the boundary from the central portion of the bottom surface of the concave portion It is comprised by the groove | channel which extends to (edge part vicinity) and surrounds two bulging parts, respectively.

密閉型電池の内圧が上昇し、設定破断圧力を超えると、凹部の中央部に位置する溝から順次破断し始め、相互に対抗する境界近傍に向かって破断することによって、弁が開放される。すなわち、弁が作動する。
特開２００２−３６７５８３号公報 When the internal pressure of the sealed battery rises and exceeds the set breaking pressure, the valve is opened by starting to break sequentially from the groove located at the center of the recess, and breaking toward the boundary facing each other. That is, the valve operates.
Japanese Patent Laid-Open No. 2002-367583

しかしながら、封口板の板厚は、凹部とその他の部分との境界部で急激に変化しており、応力が集中しやすい。溝は、底部よりもさらに板厚が小さく、境界部の近傍となる底面の縁部に設けられている。したがって、密閉型電池を落下させるなどの衝撃により、封口板に変形が加わると、溝に応力が集中し、設定される作動圧力よりも低い内部圧力でも、溝に沿って凹部の底面が裂けてしまう、すなわち、弁が作動してしまう場合がある。   However, the thickness of the sealing plate changes abruptly at the boundary between the concave portion and other portions, and stress tends to concentrate. The groove has a smaller thickness than the bottom and is provided at the edge of the bottom surface near the boundary. Therefore, if the sealing plate is deformed by an impact such as dropping the sealed battery, the stress concentrates on the groove, and the bottom surface of the recess is torn along the groove even at an internal pressure lower than the set operating pressure. In other words, the valve may be activated.

そのため、設定される作動圧力よりも弁の強度を高めに設定しなければならない。また、外部から加わる変形による応力の分だけ溝に加わる内部圧力による応力の許容量が変化するため、弁の作動圧力にばらつきが生じる原因となる。   For this reason, the strength of the valve must be set higher than the set operating pressure. Further, since the allowable amount of stress due to the internal pressure applied to the groove changes by the amount of stress due to deformation applied from the outside, the valve operating pressure varies.

そこで、本発明は、設定された作動圧力に対して精度よく作動する弁を備える封口板及び密閉型電池を提供することを目的とする。   Then, an object of this invention is to provide a sealing board provided with the valve which operate | moves accurately with respect to the set operating pressure, and a sealed battery.

本発明に係る封口板は、容器の開口部を塞いで密閉型電池の外殻を容器とともに形成するプレート部と、プレート部の一部にこのプレート部の板厚よりも薄く一定の厚みで形成されかつ板厚の方向に曲がっている湾曲部を有し湾曲部から同じ厚みで外周部がプレート部に接続される弁と、この弁に設けられる溝であってその全てが外部から加わる衝撃及び変形による応力が加わることを防止するために弁の外周縁から少なくとも１つの湾曲部を隔てる位置に一続きに延在し全長に渡って両側に湾曲部が配置された溝とを備える。 The sealing plate according to the present invention is a plate portion that closes the opening of the container and forms the outer shell of the sealed battery together with the container, and is formed on a part of the plate portion with a constant thickness that is thinner than the plate thickness of the plate portion. And a valve having a curved portion bent in the direction of the plate thickness and having the same thickness from the curved portion and the outer peripheral portion connected to the plate portion, and a groove provided in the valve, all of which is subjected to an external impact and In order to prevent stress due to deformation, a groove is provided which extends continuously to a position separating at least one curved portion from the outer peripheral edge of the valve and has curved portions arranged on both sides over the entire length.

また、弁を開きやすくするために、溝と交差する方向に溝の端部から弁の外周縁に向かって延びる少なくとも１つの補助溝を設ける。または、溝の端部から分岐する少なくとも２つの補助溝を設ける。補助溝もまた全長に渡って両側に湾曲部が配置されることが好ましい。この場合、補助溝は、溝の端部から外周縁に向かって延びて湾曲部の途中で止まるか、または溝の端部から湾曲部を横切って外周縁まで延びる。 Further, in order to facilitate opening of the valve, at least one auxiliary groove extending from the end of the groove toward the outer peripheral edge of the valve is provided in a direction crossing the groove. Alternatively, at least two auxiliary grooves branched from the end of the groove are provided. The auxiliary groove is also preferably provided with curved portions on both sides over the entire length. In this case, the auxiliary groove extends from the end of the groove toward the outer peripheral edge and stops in the middle of the curved part, or extends from the end of the groove across the curved part to the outer peripheral edge.

封口板を取扱う際に弁に触れて破損させてしまうことを防止するために、弁は、プレート部の板厚よりも内側に収める。   In order to prevent the valve from being touched and damaged when the sealing plate is handled, the valve is accommodated inside the plate thickness of the plate portion.

容器と組み合わせて密閉型電池とした場合、弁とプレート部との境界部分の内面側に内圧によって応力が集中することを防止するために、弁の外周縁は、容器の内部に面したプレート部の内側面から面一に連続して形成する。または、弁の外周縁をプレート部の板厚の途中と滑らかに連続させて形成する。   When the sealed battery is combined with the container, the outer peripheral edge of the valve is the plate part facing the inside of the container in order to prevent stress from being concentrated on the inner surface side of the boundary part between the valve and the plate part. It is formed continuously from the inner side surface. Alternatively, the outer peripheral edge of the valve is formed smoothly and continuously in the middle of the plate thickness.

本発明に係る密閉型電池は、開口部を有する容器と、開口部を塞いで容器とともに外殻の一部を形成する封口板とを備えることを前提とする。そして、封口板は、容器と外周部で接合されるプレート部と、プレート部の一部にこのプレート部の板厚よりも薄く一定の厚みで形成されかつ板厚の方向に曲がっている湾曲部を有し湾曲部から同じ厚みで外周部がプレートに接続される弁と、この弁に設けられる溝であってその全てが外部から加わる衝撃及び変形による応力が加わることを防止するために弁の外周縁から少なくとも１つの湾曲部を隔てる位置に一続きに延在し全長に渡って両側に湾曲部が配置された溝とを備える。 The sealed battery according to the present invention is premised on including a container having an opening and a sealing plate that closes the opening and forms a part of the outer shell together with the container. The sealing plate includes a plate portion joined to the container and the outer peripheral portion, and a curved portion formed in a part of the plate portion with a constant thickness thinner than the plate thickness of the plate portion and bent in the plate thickness direction. a valve outer circumferential portion is connected to the plate at the same thickness from the curved portion has a, all a groove provided in the valve is a valve in order to prevent the stress is applied due to an impact and deformation applied from outside A groove extending continuously from the outer peripheral edge at a position separating the at least one curved portion and having curved portions disposed on both sides over the entire length.

本発明に係る封口板、及び本発明に係る密閉型電池によれば、落下の衝撃や変形などによって外部から加わった応力を弁の湾曲部が変形することで緩和し、溝に応力が集中することを抑制することができる。つまり、設定された作動圧力に対して実際に弁が作動する内部圧力は、落下の衝撃や変形など外部から加わる応力に影響され難くなる。したがって、弁が実際に作動する内部圧力にばらつきが生じることを防止することができる。   According to the sealing plate according to the present invention and the sealed battery according to the present invention, the stress applied from the outside due to the impact or deformation of the drop is alleviated by the deformation of the curved portion of the valve, and the stress is concentrated in the groove. This can be suppressed. That is, the internal pressure at which the valve actually operates with respect to the set operating pressure is not easily affected by externally applied stress such as a drop impact or deformation. Therefore, it is possible to prevent variation in the internal pressure at which the valve actually operates.

また、溝に加わる応力は、内部圧力による応力が主なものとなる。そのため、変形などの外部から加わる応力を加味して溝の強度を高めなくても良くなる。したがって、弁は、設定された作動圧力に対して、実際に作動する内部圧力との差が少なく、作動圧力のばらつきが小さくなる。   The stress applied to the groove is mainly stress caused by internal pressure. Therefore, it is not necessary to increase the strength of the groove in consideration of externally applied stress such as deformation. Therefore, the valve has a small difference between the set operating pressure and the actually operating internal pressure, and the variation in the operating pressure is reduced.

本発明に係る第１の実施形態について、図１から図６を参照して説明する。密閉型電池１は、図１に示すように外殻を形成する容器２と封口板３とを供える。封口板３は、図２に示すようにプレート部４と弁５と溝６とを備える。   A first embodiment according to the present invention will be described with reference to FIGS. The sealed battery 1 includes a container 2 and a sealing plate 3 that form an outer shell as shown in FIG. As shown in FIG. 2, the sealing plate 3 includes a plate portion 4, a valve 5, and a groove 6.

プレート部４は、容器２の開口部２ａと嵌り合う段差が外周部４ａに設けられており、外周部４ａと開口部２ａの縁とが付き合わされた開先をレーザ溶接などによってシール溶接Ｗされる。また、図１に示すように、プレート部４の中央部には、ガスケット７を挟んで端子８が取り付けられている。端子８は、プレート部４を板厚方向に貫通しており、容器２の内部に収納される電極と接続される。   The plate portion 4 is provided with a step in the outer peripheral portion 4a that fits into the opening 2a of the container 2, and the groove where the outer peripheral portion 4a and the edge of the opening 2a are attached is sealed and welded by laser welding or the like. The As shown in FIG. 1, a terminal 8 is attached to the center portion of the plate portion 4 with a gasket 7 interposed therebetween. The terminal 8 passes through the plate portion 4 in the thickness direction and is connected to an electrode accommodated in the container 2.

弁５は、図２に示すように、プレート部４の一部にこのプレート部４の板厚よりも薄く形成されている。弁５は、プレス成形によってプレート部４の一部を押し潰し、板厚を減厚することで成形されている。弁５の外周縁５ａは、容器２の内部に面したプレート部４の内側面４ｂと面一に連続している。また、弁５は、板厚方向に曲がっている湾曲部５ｂを有している。この場合、湾曲部５ｂは、外周縁５ａから中央部に向かうにつれて容器２の外側に向かって曲がった後、弁５の中央部に掛けて容器２の内側に向かって曲がっている。そして、弁５は、プレート部４の板厚よりも内側に収まっている。 As shown in FIG. 2, the valve 5 is formed in a part of the plate portion 4 to be thinner than the plate thickness of the plate portion 4. The valve 5 is formed by crushing a part of the plate portion 4 by press molding and reducing the plate thickness . The outer peripheral edge 5 a of the valve 5 is continuous with the inner side surface 4 b of the plate portion 4 facing the inside of the container 2. The valve 5 has a curved portion 5b that is bent in the plate thickness direction. In this case, the curved portion 5 b is bent toward the outside of the container 2 as it goes from the outer peripheral edge 5 a to the center portion, and then is bent toward the inside of the container 2 by being hung on the center portion of the valve 5. The valve 5 is accommodated inside the plate thickness of the plate portion 4.

溝６は、図２から図５に示すように弁５の外周縁５ａから湾曲部５ｂを隔てる位置に一続きに延在している。溝６は、図２及び図５に示すように弁５の板厚よりも薄く形成されている。また、溝６と交差する方向に溝６の端部６ａから弁５の外周縁５ａに向かって延びる補助溝９が設けられている。   As shown in FIGS. 2 to 5, the groove 6 extends continuously to a position separating the curved portion 5 b from the outer peripheral edge 5 a of the valve 5. As shown in FIGS. 2 and 5, the groove 6 is formed thinner than the plate thickness of the valve 5. An auxiliary groove 9 extending from the end 6 a of the groove 6 toward the outer peripheral edge 5 a of the valve 5 is provided in a direction intersecting with the groove 6.

本実施形態では、図３及び図４に示すように弁５が長方形に設けられており、溝６は、弁５の中央部に長手方向に沿って配置されている。補助溝９は、溝６の端部６ａから２つに分岐し湾曲部５ｂを横切って、長方形に設けられた弁５の四角の手前となる外周縁５ａまでそれぞれ延びている。   In this embodiment, as shown in FIGS. 3 and 4, the valve 5 is provided in a rectangular shape, and the groove 6 is disposed in the central portion of the valve 5 along the longitudinal direction. The auxiliary groove 9 branches into two from the end 6a of the groove 6 and extends across the curved portion 5b to the outer peripheral edge 5a that is in front of the square of the valve 5 provided in a rectangular shape.

また、溝６と補助溝９は、プレート部４の内側面４ｂと面一に形成されており、これら以外の部分は、容器２の外側に向かってプレート部４の板厚方向に膨らんでいる。   Further, the groove 6 and the auxiliary groove 9 are formed flush with the inner side surface 4 b of the plate portion 4, and other portions swell in the plate thickness direction of the plate portion 4 toward the outside of the container 2. .

以上のように構成された密閉型電池１は、容器２の内部圧力が加わると、弁５が容器２の外側に向かって押圧され、溝６及び補助溝９に引張応力が作用する。設定された作動圧力よりも内部圧力が高くなると、溝６の端部６ａを起点に溝６及び補助溝９に沿って亀裂が入り、図６に示すように弁５が裂開される。すなわち、弁５は、圧力逃し弁として作動する。弁５は、外周縁５ａがプレート部４と連続しているので、裂開（作動）した後もプレート部４から脱落することがない。   In the sealed battery 1 configured as described above, when the internal pressure of the container 2 is applied, the valve 5 is pressed toward the outside of the container 2, and tensile stress acts on the groove 6 and the auxiliary groove 9. When the internal pressure becomes higher than the set operating pressure, a crack is formed along the groove 6 and the auxiliary groove 9 from the end 6a of the groove 6, and the valve 5 is opened as shown in FIG. That is, the valve 5 operates as a pressure relief valve. Since the outer peripheral edge 5 a is continuous with the plate portion 4, the valve 5 does not fall off from the plate portion 4 even after being split (actuated).

また、弁５に湾曲部５ｂが設けられているとともに弁５の外周縁５ａから湾曲部５ｂを隔てた位置に溝６が設けられているので、密閉型電池１が落下するなどによって封口板３に外部から衝撃や変形を受けても、この湾曲部５ｂが変形し、溝６に応力が集中することが防止される。つまり、弁５が作動する内部圧力は、封口板３に外部から加わる衝撃や変形による応力の影響を受け難くなる。   Further, since the valve 5 is provided with the curved portion 5b and the groove 6 is provided at a position separating the curved portion 5b from the outer peripheral edge 5a of the valve 5, the sealing plate 3 is dropped when the sealed battery 1 is dropped or the like. Even if an external impact or deformation is applied, the curved portion 5b is deformed and stress is prevented from being concentrated in the groove 6. That is, the internal pressure at which the valve 5 operates is not easily affected by the external impact on the sealing plate 3 or the stress due to deformation.

したがって、溝６に加わる応力は、内部圧力に起因する応力が主なものとなるので、設定された作動圧力に対して実際に作動する内部圧力のばらつきが小さくなる。すなわち、弁５は、設定された作動圧力に対して精度よく作動する。また、封口板３に外部から加わる衝撃や変形を加味して溝６の強度を高くする必要がないので、弁５の作動圧力を低く設定することができる。   Therefore, since the stress applied to the groove 6 is mainly stress caused by the internal pressure, the variation of the internal pressure that actually operates with respect to the set operating pressure is reduced. That is, the valve 5 operates accurately with respect to the set operating pressure. Further, since it is not necessary to increase the strength of the groove 6 in consideration of external impact and deformation applied to the sealing plate 3, the operating pressure of the valve 5 can be set low.

本発明に係る第２の実施形態について、図７を参照して説明する。なお、第１の実施形態と同じ機能を有する構成については、同一の符号を付してその説明を省略する。図７に示すように、封口板３のプレート部４の一部に設けられた弁５は、外周縁５ａがプレート部４の板厚の途中４ｃと滑らかに連続している。また、溝６及び補助溝９は、弁５の外周縁５ａから湾曲部５ｂを隔てた位置に容器２の内部に面した側から設けられている。なお、溝６及び補助溝９を容器の外側から見た平面視は、図３とほぼ同じ状態である。   A second embodiment according to the present invention will be described with reference to FIG. In addition, about the structure which has the same function as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. As shown in FIG. 7, in the valve 5 provided in a part of the plate portion 4 of the sealing plate 3, the outer peripheral edge 5 a is smoothly continuous with the middle 4 c of the plate thickness of the plate portion 4. Further, the groove 6 and the auxiliary groove 9 are provided from the side facing the inside of the container 2 at a position separating the curved portion 5 b from the outer peripheral edge 5 a of the valve 5. The plan view of the groove 6 and the auxiliary groove 9 when viewed from the outside of the container is substantially the same as that in FIG.

以上のように形成された密閉型電池１の封口板３は、弁５の外周縁５ａがプレート部４の板厚の途中４ｃと滑らかに連続しているので、外周縁５ａとプレート部４との境界に内部圧力による引張応力が集中することを防止することができる。また、溝６及び補助溝９は、容器２の内部に面した側に設けられているので、内部圧力が加わることで弁５が外側に撓んだ場合、溝６及び補助溝９には、圧縮応力が作用する。   In the sealing plate 3 of the sealed battery 1 formed as described above, the outer peripheral edge 5a of the valve 5 is smoothly continuous with the middle 4c of the plate part 4 in the plate thickness. Therefore, the outer peripheral edge 5a and the plate part 4 It is possible to prevent the tensile stress due to the internal pressure from concentrating on the boundary. In addition, since the groove 6 and the auxiliary groove 9 are provided on the side facing the inside of the container 2, when the valve 5 is bent outward due to application of internal pressure, the groove 6 and the auxiliary groove 9 include Compressive stress acts.

このように、弁５が作動圧力に満たない内部圧力を繰り返し受けて撓んだ場合、弁５に疲労が蓄積し難い。したがって、この封口板３を充電と放電とが繰り返される二次電池に適用した場合、湾曲部５ｂを有しているので封口板３に外部から加わる変形による影響を受けることなく設定された作動圧力に対して精度よく作動するとともに、充電及び放電を繰り返すことによって作動圧力未満の内部圧力が繰り返し加わっても疲労が蓄積し難い耐久性に優れた密閉型電池１を提供することができる。   In this way, when the valve 5 is repeatedly subjected to internal pressure less than the operating pressure and is bent, fatigue does not easily accumulate in the valve 5. Therefore, when this sealing plate 3 is applied to a secondary battery in which charging and discharging are repeated, the operating pressure set without being affected by deformation applied from the outside to the sealing plate 3 because it has the curved portion 5b. In addition, it is possible to provide a sealed battery 1 having excellent durability, which operates with high accuracy, and does not accumulate fatigue even when an internal pressure less than the operating pressure is repeatedly applied by repeating charging and discharging.

本発明に係る第３の実施形態について、図８を参照して説明する。なお、第１及び第２の実施形態と同じ機能を有する構成については、同一の符号を付してその説明を省略する。図８に示すように、弁５の外周縁５ａは、プレート部４の内側面４ｂと面一に連続して設けられている。容器２の外側から見た弁５の形状は、長円形である。弁５は、容器２の外側に向かって曲がる湾曲部５ｂを有しており、全体がドーム状に隆起するように形成されている。溝６は、弁５の外周縁５ａから湾曲部５ｂを隔てた位置、本実施形態では、長円形の中央部に設けられている。また、第１及び第２の実施形態のように封口板３の弁５には、補助溝を有していない。   A third embodiment according to the present invention will be described with reference to FIG. In addition, about the structure which has the same function as 1st and 2nd embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. As shown in FIG. 8, the outer peripheral edge 5 a of the valve 5 is provided so as to be flush with the inner side surface 4 b of the plate portion 4. The shape of the valve 5 viewed from the outside of the container 2 is an oval. The valve 5 has a curved portion 5b that bends toward the outside of the container 2, and is formed so that the whole is raised in a dome shape. The groove 6 is provided at a position separating the curved portion 5b from the outer peripheral edge 5a of the valve 5, that is, in the present embodiment, at the center of the oval. Further, unlike the first and second embodiments, the valve 5 of the sealing plate 3 does not have an auxiliary groove.

このように形成された密閉型電池１は、封口板３に外部から衝撃や変形が加わっても、湾曲部５ｂが変形による応力を緩和するので、溝６に応力が集中することを防止することができる。したがって、弁５に作用する応力は、封口板３に外部から加わる衝撃や変形に影響されることなく、内部圧力に起因する応力が主なものとなるので、設定された作動圧力に対して実際に作動する内部圧力のばらつきが小さくなる。つまり、設定した作動圧力に対して弁５が精度よく作動する。また、封口板３に外部から加わる衝撃や変形の影響を考慮して溝６の強度を高める必要がないので、低い内部圧力で弁５が作動するように設定することもできる。   The sealed battery 1 formed in this way prevents the stress from concentrating in the groove 6 because the bending portion 5b relieves stress due to deformation even when impact or deformation is applied to the sealing plate 3 from the outside. Can do. Therefore, the stress acting on the valve 5 is not affected by the impact or deformation applied to the sealing plate 3 from the outside, but mainly the stress caused by the internal pressure. The variation in the internal pressure that operates at the same time is reduced. That is, the valve 5 operates accurately with respect to the set operating pressure. Further, since it is not necessary to increase the strength of the groove 6 in consideration of the impact or deformation applied to the sealing plate 3 from the outside, the valve 5 can be set to operate with a low internal pressure.

なお、本発明の封口板３および密閉型電池１の弁５に設けられる溝６は、弁５の外周縁５ａから少なくとも湾曲部５ｂを隔てた位置に一続きに延在すればよい。また、補助溝９は、溝６と交差する方向に溝６の端部６ａから弁５の外周縁５ａに向かって延びる少なくとも１つを備えるか、第１の実施形態のように溝６の端部６ａから分岐する少なくとも２つの補助溝９を備えるように設けられていればよい。この場合、補助溝９は、溝６の端部６ａから弁５の外周縁５ａに向かって延びて、湾曲部５ｂの途中で止まって良いし、溝６の端部６ａから湾曲部５ｂを横切って外周縁５ａまで延びるように設けても良い。   In addition, the groove | channel 6 provided in the sealing plate 3 of this invention and the valve 5 of the sealed battery 1 should just extend to the position which separated the curved part 5b from the outer periphery 5a of the valve 5 at least. The auxiliary groove 9 includes at least one extending from the end 6a of the groove 6 toward the outer peripheral edge 5a of the valve 5 in a direction intersecting the groove 6, or the end of the groove 6 as in the first embodiment. What is necessary is just to be provided so that the at least 2 auxiliary groove 9 branched from the part 6a may be provided. In this case, the auxiliary groove 9 may extend from the end portion 6a of the groove 6 toward the outer peripheral edge 5a of the valve 5 and stop in the middle of the curved portion 5b, or cross the curved portion 5b from the end portion 6a of the groove 6. May be provided so as to extend to the outer peripheral edge 5a.

そこで、溝６と補助溝９の様々な配置について分類分けしたものを図９に模式的に示す。図９中において、最外周の線がプレート部４と弁５との境界を示す。また、ハッチングで示した範囲が湾曲部５ｂである。   FIG. 9 schematically shows various types of arrangement of the grooves 6 and the auxiliary grooves 9. In FIG. 9, the outermost line indicates the boundary between the plate portion 4 and the valve 5. Moreover, the range shown by hatching is the curved part 5b.

本発明に係る第１の実施形態の密閉型電池を示す斜視図。1 is a perspective view showing a sealed battery according to a first embodiment of the present invention. 図１中のＦ２−Ｆ２に沿って示す封口板に設けられた弁の断面図。Sectional drawing of the valve provided in the sealing board shown along F2-F2 in FIG. 図１の弁を密閉型電池の外側から見た平面図。The top view which looked at the valve of FIG. 1 from the outer side of the sealed battery. 図１の弁を密閉型電池の内側から見た平面図。The top view which looked at the valve of FIG. 1 from the inner side of the sealed battery. 図３中のＦ５−Ｆ５に沿って示す封口板に設けられた弁の断面図。Sectional drawing of the valve provided in the sealing board shown along F5-F5 in FIG. 図１の弁が作動圧力によって開弁された状態を一部断面にして示す斜視図。The perspective view which shows the state by which the valve of FIG. 1 was opened by the operating pressure in a partial cross section. 本発明に係る第２の実施形態の密閉型電池について、封口板に設けられた弁を示す断面図。Sectional drawing which shows the valve provided in the sealing board about the sealed battery of 2nd Embodiment which concerns on this invention. 本発明に係る第３の実施形態の密閉型電池について、封口板に設けられた弁を一部断面にして示す斜視図。The perspective view which shows the valve | bulb provided in the sealing board in a partial cross section about the sealed battery of 3rd Embodiment which concerns on this invention. 溝と補助溝との配置例を分類分けして模式的に示す図。The figure which classifies and classifies the example of arrangement | positioning of a groove | channel and an auxiliary groove | channel.

符号の説明Explanation of symbols

１…密閉型電池、２…容器、２ａ…開口部、３…封口板、４…プレート部、４ａ…外周部、４ｂ…内側面、５…弁、５ａ…外周縁、５ｂ…湾曲部、６…溝、６ａ…端部、９…補助溝。   DESCRIPTION OF SYMBOLS 1 ... Sealed battery, 2 ... Container, 2a ... Opening part, 3 ... Sealing plate, 4 ... Plate part, 4a ... Outer peripheral part, 4b ... Inner side surface, 5 ... Valve, 5a ... Outer periphery, 5b ... Curved part, 6 ... groove, 6a ... end, 9 ... auxiliary groove.

Claims (8)

容器の開口部を塞いで密閉型電池の外殻を前記容器とともに形成するプレート部と、
前記プレート部の一部にこのプレート部の板厚よりも薄く一定の厚みで形成されかつ前記板厚の方向に曲がっている湾曲部を有し、前記湾曲部から同じ厚みで外周部が前記プレート部に接続される弁と、
前記弁に設けられる溝であって、その全てが外部から加わる衝撃及び変形による応力が加わることを防止するために前記弁の外周縁から少なくとも１つの前記湾曲部を隔てる位置に一続きに延在し、全長に渡って両側に前記湾曲部を配置された溝と
を備えることを特徴とする封口板。 A plate portion that closes the opening of the container and forms the outer shell of the sealed battery together with the container;
A part of the plate portion has a curved portion that is formed with a constant thickness thinner than the plate thickness of the plate portion and is bent in the direction of the plate thickness, and the outer peripheral portion has the same thickness from the curved portion as the plate. A valve connected to the section;
Grooves provided in the valve, all of which extend continuously to a position separating at least one of the curved portions from the outer peripheral edge of the valve in order to prevent external stress and deformation from being applied. And a groove plate provided with the curved portion on both sides over the entire length. 前記溝と交差する方向に前記溝の端部から前記弁の外周縁に向かって延びる少なくとも １つの補助溝を備えることを特徴とする請求項１に記載の封口板。   The sealing plate according to claim 1, further comprising at least one auxiliary groove extending from an end of the groove toward an outer peripheral edge of the valve in a direction intersecting with the groove. 前記溝の端部から分岐する少なくとも２つの補助溝を備えることを特徴とする請求項１に記載の封口板。   The sealing plate according to claim 1, further comprising at least two auxiliary grooves branched from an end of the groove. 前記弁は、前記プレート部の板厚よりも内側に収まっていることを特徴とする請求項１に記載の封口板。   The sealing plate according to claim 1, wherein the valve is accommodated inside a plate thickness of the plate portion. 前記弁の外周縁は、前記容器の内部に面した前記プレート部の内側面から面一に連続して形成されることを特徴とする請求項１に記載の封口板。   2. The sealing plate according to claim 1, wherein an outer peripheral edge of the valve is continuously formed flush with an inner surface of the plate portion facing the inside of the container. 前記弁の外周縁は、前記プレート部の板厚の途中と滑らかに連続して形成されることを特徴とする請求項１に記載の封口板。   The sealing plate according to claim 1, wherein the outer peripheral edge of the valve is formed smoothly and continuously in the middle of the plate thickness of the plate portion. 開口部を有する容器と、前記開口部を塞ぐ封口板とによって外殻を構成する密閉型電池において、
前記封口板は、
前記容器と外周部で接合されるプレート部と、
前記プレート部の一部にこのプレート部の板厚よりも薄く一定の厚みで形成されかつ前記板厚の方向に曲がっている湾曲部を有し、前記湾曲部から同じ厚みで外周部が前記プレートに接続される弁と、
前記弁に設けられる溝であって、その全てが外部から加わる衝撃及び変形による応力が加わることを防止するために前記弁の外周縁から少なくとも１つの前記湾曲部を隔てる位置に一続きに延在し、全長に渡って両側に前記湾曲部を配置された溝と
を備えることを特徴とする密閉型電池。 In a sealed battery that forms an outer shell with a container having an opening and a sealing plate that closes the opening,
The sealing plate is
A plate portion joined at the outer periphery with the container;
A part of the plate portion has a curved portion that is formed with a constant thickness thinner than the plate thickness of the plate portion and is bent in the direction of the plate thickness, and the outer peripheral portion has the same thickness from the curved portion as the plate. A valve connected to the
Grooves provided in the valve, all of which extend continuously to a position separating at least one of the curved portions from the outer peripheral edge of the valve in order to prevent external stress and deformation from being applied. And a groove in which the curved portion is arranged on both sides over the entire length. 前記溝と交差する方向に、前記溝の端部から前記弁の外周縁に向かって延びる少なくとも１つの補助溝をさらに備えることを特徴とする請求項７に記載の密閉型電池。 The sealed battery according to claim 7, further comprising at least one auxiliary groove extending from an end of the groove toward an outer peripheral edge of the valve in a direction intersecting with the groove.
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