JP2008251206A - Cylindrical battery - Google Patents

Cylindrical battery Download PDF

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JP2008251206A
JP2008251206A JP2007087640A JP2007087640A JP2008251206A JP 2008251206 A JP2008251206 A JP 2008251206A JP 2007087640 A JP2007087640 A JP 2007087640A JP 2007087640 A JP2007087640 A JP 2007087640A JP 2008251206 A JP2008251206 A JP 2008251206A
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sealing plate
outer peripheral
cylindrical battery
sealing
cylindrical
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JP5137438B2 (en
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Yoshikazu Ujimiya
義和 宇治宮
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Sanyo Electric Co Ltd
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    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical battery in which rise of working pressure of a safety valve is controlled by suppressing warping of a sealing plate. <P>SOLUTION: The cylindrical battery is provided with a cylindrical outer package can having an aperture end, a power generating element housed in the outer package can, a sealing plate (14) arranged in the aperture end of the outer package can, an annular gasket of electrical insulation property which is installed between the aperture end of the outer package can and the sealing plate (14) and seals between the outer peripheral part (14b) of the sealing plate (14) and the aperture end, a degassing hole (14a) formed in the center of the sealing plate (14), a valve made of an elastic material which is arranged on the outside of the sealing plate (14) in compressed state and closes the degassing hole (14a) up to a working pressure, and a cup-shape terminal to cover the valve. The sealing plate (14) has a thick portion (14c) thicker than the outer peripheral part (14b) at the inside in diameter direction of the outer peripheral part (14b). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は円筒形電池に関する。   The present invention relates to a cylindrical battery.

円筒形電池には、アルカリ電池等の一次電池やニッケル水素二次電池等の二次電池があり、例えば、ニッケル水素二次電池は、携帯用電子機器や電機自動車のバッテリ等に広く使用されている。
円筒形電池は、その外装缶内に発電要素としての正極板、負極板及び電解質が収容され、外装缶の開口端部は封口体により密閉されている（特許文献１）。 Cylindrical batteries include primary batteries such as alkaline batteries and secondary batteries such as nickel metal hydride secondary batteries. For example, nickel metal hydride secondary batteries are widely used in portable electronic devices, electric vehicle batteries, and the like. Yes.
In a cylindrical battery, a positive electrode plate, a negative electrode plate, and an electrolyte as power generation elements are accommodated in an outer can, and an opening end of the outer can is sealed with a sealing body (Patent Document 1).

より詳しくは、封口体は、円板形状の封口板と、封口板と外装缶の開口端部との間に配置される絶縁ガスケットとを含み、開口端部と封口板の外周部との間は絶縁ガスケットによりシールされる。
封口板はその中央にガス抜き孔を有し、封口板の外面上には、ガス抜き孔を塞ぐように、弾性材料からなる弁体が配置され、更に、弁体を覆うようにカップ状の端子が固定されている。弁体は、封口板に対し、圧縮された状態で押し付けられ、所定の作動圧までガス抜き孔を閉塞する。すなわち、封口体は、安全弁としての機能を有する。
特開２００２−９３４５５号公報 More specifically, the sealing body includes a disc-shaped sealing plate, and an insulating gasket disposed between the sealing plate and the opening end of the outer can, and between the opening end and the outer peripheral portion of the sealing plate. Is sealed by an insulating gasket.
The sealing plate has a gas vent hole in the center, and a valve body made of an elastic material is disposed on the outer surface of the sealing plate so as to close the gas vent hole. Terminal is fixed. The valve body is pressed against the sealing plate in a compressed state, and closes the gas vent hole to a predetermined operating pressure. That is, the sealing body has a function as a safety valve.
JP 2002-93455 A

電池の高容量化に伴い、発電要素を収容するための容積を増大すべく、封口板の厚さは削減されており、封口板は、例えば０．４ｍｍの厚さを有する。
しかしながら、封口板の厚さが０．４ｍｍになると、電池内の圧力が上昇したときに、封口板が外側に反ってしまう。封口板が反ると、弁体の圧縮率が高くなり、作動圧も上昇してしまう。この傾向は、電池内圧が３．０ＭＰａを超えると顕著になるため、３．０ＭＰａを超える範囲では、作動圧の微調整が困難になっていた。 As the capacity of the battery increases, the thickness of the sealing plate is reduced to increase the volume for accommodating the power generation element, and the sealing plate has a thickness of 0.4 mm, for example.
However, when the thickness of the sealing plate becomes 0.4 mm, the sealing plate warps outward when the pressure in the battery increases. When the sealing plate is warped, the compression ratio of the valve body is increased and the operating pressure is also increased. This tendency becomes prominent when the internal pressure of the battery exceeds 3.0 MPa, and therefore fine adjustment of the operating pressure has been difficult in the range exceeding 3.0 MPa.

本発明は上述の事情に基づいてなされたもので、その目的とするところは、電池の高容量化に伴い、発電要素を収容するための容積を増大すべく、封口板の厚さは削減したときに、封口板の反りを抑制することにより安全弁の作動圧上昇が抑制された円筒形電池を提供することにある。   The present invention has been made based on the above-mentioned circumstances, and the purpose of the present invention is to reduce the thickness of the sealing plate in order to increase the capacity for accommodating the power generation element as the capacity of the battery increases. Sometimes, the present invention provides a cylindrical battery in which the increase in the operating pressure of the safety valve is suppressed by suppressing the warping of the sealing plate.

上記の目的を達成するために、本発明によれば、開口端部を有する円筒状の外装缶と、前記外装缶内に収容された発電要素と、前記外装缶の前記開口端部内に配置された封口板と、前記外装缶の開口端部と前記封口板との間に設けられ、前記開口端部をかしめることにより前記封口板の外周部と前記開口端部との間をシールする電気絶縁性の環状のガスケットと、前記封口板の中央に形成されたガス抜き孔と、前記封口板の外面上に圧縮された状態で配置され、前記ガス抜き孔を作動圧まで閉塞する弾性材料からなる弁体と、前記弁体を覆うカップ状の端子とを備え、前記封口板は、前記外周部よりも径方向内側に、前記外周部よりも厚い厚肉部を有することを特徴とする円筒形電池が提供される（請求項１）。   In order to achieve the above object, according to the present invention, a cylindrical outer can having an open end, a power generation element housed in the outer can, and the open end of the outer can are arranged. The sealing plate is provided between the opening end of the outer can and the sealing plate, and seals between the outer periphery of the sealing plate and the opening end by caulking the opening end. An insulating annular gasket, a gas vent hole formed in the center of the sealing plate, and an elastic material disposed in a compressed state on the outer surface of the sealing plate and closing the gas vent hole to an operating pressure. And a cup-shaped terminal that covers the valve body, and the sealing plate has a thick part thicker than the outer peripheral part on the radially inner side than the outer peripheral part. A battery is provided (claim 1).

好ましくは、前記厚肉部の外径は、前記封口板の外径の６５％以上である（請求項２）。
好ましくは、前記封口板は、前記厚肉部と前記外周部との間に、径方向外側に向かうに連れて厚さが小さくなるテーパ部を更に有し、前記テーパ部のテーパ角は４５度以下である（請求項３）。 Preferably, the outer diameter of the thick portion is 65% or more of the outer diameter of the sealing plate (Claim 2).
Preferably, the sealing plate further includes a tapered portion between the thick portion and the outer peripheral portion, the thickness of which decreases as it goes radially outward, and the taper angle of the tapered portion is 45 degrees. (Claim 3)

本発明の請求項１の円筒形電池では、封口板が厚肉部を有するため、内圧が上昇したとしても、封口板の反りが抑制される。これにより、この円筒形電池では、内圧上昇に伴う弁体の圧縮率の増大が抑制され、作動圧の上昇が抑制される。この結果として、この円筒形電池では、設定された作動圧が３ＭＰａを超えていても、設定した作動圧にて安全弁が確実に作動する。   In the cylindrical battery according to claim 1 of the present invention, since the sealing plate has a thick portion, even if the internal pressure increases, the warping of the sealing plate is suppressed. Thereby, in this cylindrical battery, an increase in the compression ratio of the valve body accompanying an increase in internal pressure is suppressed, and an increase in operating pressure is suppressed. As a result, in this cylindrical battery, even if the set operating pressure exceeds 3 MPa, the safety valve operates reliably at the set operating pressure.

一方、この円筒形電池では、封口板の外周部を厚くする必要が無いため、封口板の外周部を挟んでいる外装缶の部分の高さが増大することはない。この結果として、外装缶の外形寸法が同一であれば外装缶内の容積が十分に確保され、この円筒形電池は高容量化に適する。
請求項２の円筒形電池では、厚肉部の外径が封口板の外径の６５％以上であるため、内圧上昇に伴う封口板の反りが確実に抑制される。この結果として、この円筒形電池では、内圧が上昇したときに、作動圧の上昇が確実に抑制される。 On the other hand, in this cylindrical battery, since it is not necessary to thicken the outer peripheral part of the sealing plate, the height of the portion of the outer can that sandwiches the outer peripheral part of the sealing plate does not increase. As a result, if the outer dimensions of the outer can are the same, a sufficient volume in the outer can is secured, and this cylindrical battery is suitable for increasing the capacity.
In the cylindrical battery according to the second aspect, since the outer diameter of the thick portion is 65% or more of the outer diameter of the sealing plate, the warping of the sealing plate accompanying the increase in the internal pressure is reliably suppressed. As a result, in this cylindrical battery, when the internal pressure increases, the increase in operating pressure is reliably suppressed.

請求項３の円筒形電池では、厚肉部と外周部との間にテーパ角が４５度以下のテーパ部を設けたため、封口板に衝撃等が加わったときに、厚肉部と外周部との境界近傍での応力集中が緩和される。この結果として、この円筒形電池の封口板は、強度が確保され変形し難い。   In the cylindrical battery according to claim 3, since the taper portion having a taper angle of 45 degrees or less is provided between the thick portion and the outer peripheral portion, when an impact or the like is applied to the sealing plate, the thick portion and the outer peripheral portion The stress concentration in the vicinity of the boundary is relaxed. As a result, the sealing plate of the cylindrical battery has sufficient strength and is not easily deformed.

以下、本発明の一実施形態に係る円筒形電池として、単三サイズのニッケル水素二次電池について説明する。
図１に示したように、ニッケル水素二次電池は、容器として有底円筒状の外装缶２を備え、外装缶２内には、発電要素としての正極板４、負極板６及びアルカリ電解液（図示せず）が収容されている。 Hereinafter, an AA size nickel-hydrogen secondary battery will be described as a cylindrical battery according to an embodiment of the present invention.
As shown in FIG. 1, the nickel hydride secondary battery includes a bottomed cylindrical outer can 2 as a container, and in the outer can 2, a positive electrode plate 4, a negative electrode plate 6 and an alkaline electrolyte as power generation elements. (Not shown) is accommodated.

これら正極板４及び負極板６は、セパレータ８を介して渦巻き状に巻回されることで略円筒状の電極群１０を形成しており、電極群１０の最外周は負極板６の一部（最外周部）により形成されている。負極板６の最外周部が外装缶２の内周壁と接触することで、負極板６と外装缶２とは互いに電気的に接続されている。なお、電極群１０と外装缶２の底壁との間には、円板形状の絶縁部材１１が配置されている。   The positive electrode plate 4 and the negative electrode plate 6 are spirally wound via a separator 8 to form a substantially cylindrical electrode group 10, and the outermost periphery of the electrode group 10 is a part of the negative electrode plate 6. (The outermost peripheral part). When the outermost peripheral part of the negative electrode plate 6 contacts the inner peripheral wall of the outer can 2, the negative electrode plate 6 and the outer can 2 are electrically connected to each other. A disk-shaped insulating member 11 is disposed between the electrode group 10 and the bottom wall of the outer can 2.

外装缶２の開口端側において、電極群１０の正極板４からは、正極リード１２が延びている。正極リード３０の先端は、後述する封口板１４の内面に溶接されている。なお、封口板１４と電極群１０との間には円板形状の絶縁部材１５が配置され、正極リード１２は、絶縁部材１５に形成されたスリットを貫通している。
なお、負極板６は、例えばパンチングメタルからなる導電性の負極基板を有し、負極基板の両面には、負極活物質層が形成されている。負極活物質層は、主成分としての水素吸蔵合金粉末と、結着剤と、必要に応じて導電剤等とを含む。水素吸蔵合金粉末は、負極活物質としての水素を電気化学的に吸蔵又は放出可能である。 On the opening end side of the outer can 2, a positive electrode lead 12 extends from the positive electrode plate 4 of the electrode group 10. The tip of the positive electrode lead 30 is welded to the inner surface of a sealing plate 14 described later. A disc-shaped insulating member 15 is disposed between the sealing plate 14 and the electrode group 10, and the positive electrode lead 12 passes through a slit formed in the insulating member 15.
The negative electrode plate 6 has a conductive negative electrode substrate made of, for example, punching metal, and negative electrode active material layers are formed on both surfaces of the negative electrode substrate. The negative electrode active material layer includes a hydrogen storage alloy powder as a main component, a binder, and a conductive agent as necessary. The hydrogen storage alloy powder is capable of electrochemically storing or releasing hydrogen as a negative electrode active material.

また、正極板４は、例えば、３次元の網目状構造を有したニッケル多孔体からなる導電性の正極基板を有し、正極基板には正極合剤が充填されている。正極合剤は、主成分としての正極活物質、つまり、水酸化ニッケル粉末と、結着剤と、必要に応じて導電剤等とを含む。
外装缶２の開口端部は、安全弁としての機能を備えた封口体１６により密閉され、封口体１６は、円板形状をなす封口板１４を有する。封口板１４の材料としては、例えば、鉄製の板にニッケルめっきが施されたものを用いることができる。封口板１４は、外装缶２の開口端部に囲まれる一方、中央にガス抜き孔１４ａを有する。封口板１４の外面には、ガス抜き孔１４ａを閉塞するように弁体２０が配置され、弁体２０は、ＥＰＤＭ（エチレンプロピレンジエンゴム）等の弾性材料からなり、略円柱状の形状を有する。 The positive electrode plate 4 includes a conductive positive electrode substrate made of a nickel porous body having a three-dimensional network structure, for example, and the positive electrode substrate is filled with a positive electrode mixture. The positive electrode mixture includes a positive electrode active material as a main component, that is, nickel hydroxide powder, a binder, and a conductive agent as necessary.
The opening end of the outer can 2 is sealed with a sealing body 16 having a function as a safety valve, and the sealing body 16 has a sealing plate 14 having a disc shape. As the material of the sealing plate 14, for example, a material obtained by applying nickel plating to an iron plate can be used. The sealing plate 14 is surrounded by the opening end of the outer can 2, and has a gas vent hole 14 a at the center. A valve body 20 is disposed on the outer surface of the sealing plate 14 so as to close the gas vent hole 14a. The valve body 20 is made of an elastic material such as EPDM (ethylene propylene diene rubber) and has a substantially cylindrical shape. .

更に、封口板１４の外面上には、弁体２０を覆うフランジ付きの円筒状の正極端子２１が溶接により固定されている。正極端子２１は、弁体２０を封口板１４に対し押し付けており、弁体２０は圧縮された状態にある。
なお、正極板４と正極端子２１との間は、正極リード１２及び封口板１４を介して電気的に接続されている。 Furthermore, on the outer surface of the sealing plate 14, a cylindrical positive terminal 21 with a flange that covers the valve body 20 is fixed by welding. The positive electrode terminal 21 presses the valve body 20 against the sealing plate 14, and the valve body 20 is in a compressed state.
The positive electrode plate 4 and the positive electrode terminal 21 are electrically connected via the positive electrode lead 12 and the sealing plate 14.

また、封口体１６は、封口板１４と外装缶２の開口端部との間に配置された環状のガスケット２２を有する。ガスケット２２は例えばナイロン樹脂からなり、電気絶縁性を有する。封口体１６の封口板１４は、ガスケット２２を介して、かしめ加工された外装缶２の開口端部に固定され、封口板１４の外周部１４ｂと外装缶２の開口端部との間はガスケット２２によりシールされている。   Further, the sealing body 16 includes an annular gasket 22 disposed between the sealing plate 14 and the opening end of the outer can 2. The gasket 22 is made of, for example, nylon resin and has electrical insulation. The sealing plate 14 of the sealing body 16 is fixed to the opening end of the caulked outer can 2 via a gasket 22, and a gasket is provided between the outer peripheral portion 14 b of the sealing plate 14 and the opening end of the outer can 2. 22 is sealed.

より詳しくは、図２及び図３に示したように、封口板１４は、径方向でみて、ガス抜き孔１４ａから所定の径方向位置にまで渡る環状の厚肉部１４ｃを有する。厚肉部１４ｃの厚さＴ１は、外周部１４ｂの厚さＴ２よりも大きく、厚さＴ１は、厚さＴ２の１２５％以上１７５％以下であるのが好ましい。また好ましくは、厚肉部１４ｃの外径Ｄ１は、外周部１４ｂの外径Ｄ２、即ち封口板１４の外径の６５％以上である。   More specifically, as shown in FIGS. 2 and 3, the sealing plate 14 has an annular thick portion 14c extending from the gas vent hole 14a to a predetermined radial position as viewed in the radial direction. The thickness T1 of the thick portion 14c is larger than the thickness T2 of the outer peripheral portion 14b, and the thickness T1 is preferably 125% or more and 175% or less of the thickness T2. Preferably, the outer diameter D1 of the thick portion 14c is 65% or more of the outer diameter D2 of the outer peripheral portion 14b, that is, the outer diameter of the sealing plate 14.

また、好ましくは、封口板１４にはテーパ部１４ｄが設けられる。テーパ部１４ｄは、径方向でみて、厚肉部１４ｃと外周部１４ｂとの間に設けられ、テーパ部１４ｄの厚さは、径方向外側に向かうに連れて減少する。テーパ部１４ｄのテーパ角θは、４５度以下であるのが好ましい。
上述した封口板１４は、板状の材料をプレス成形することにより作製することができる。なお、図２及び図３では、厚肉部１４ｃは段付けられているが、段付けられていなくてもよい。 Preferably, the sealing plate 14 is provided with a tapered portion 14d. The tapered portion 14d is provided between the thick portion 14c and the outer peripheral portion 14b when viewed in the radial direction, and the thickness of the tapered portion 14d decreases as it goes radially outward. The taper angle θ of the taper portion 14d is preferably 45 degrees or less.
The sealing plate 14 described above can be produced by press-molding a plate-like material. In FIGS. 2 and 3, the thick portion 14c is stepped, but may not be stepped.

上述した円筒形電池では、電池の内圧が作動圧まで上昇すると、弁体２０が更に圧縮されてガス抜き孔１４ａが開き、電池内のガスが外部に放出される。これにより、電池の内圧が異常に上昇するのが防止される。
また、この円筒形電池では、封口板１４が厚肉部１４ｃを有するため、内圧が上昇したとしても、封口板１４の反りが抑制される。これにより、この円筒形電池では、内圧が上昇したときに、弁体２０の圧縮率が増大するのが抑制され、作動圧の上昇が抑制される。この結果として、この円筒形電池では、組立て時における弁体２０の圧縮率に基づいて設定される作動圧が３ＭＰａを超えていても、設定された作動圧にて安全弁が確実に作動する。 In the above-described cylindrical battery, when the internal pressure of the battery rises to the operating pressure, the valve body 20 is further compressed, the gas vent hole 14a is opened, and the gas in the battery is released to the outside. Thereby, the internal pressure of the battery is prevented from rising abnormally.
Moreover, in this cylindrical battery, since the sealing plate 14 has the thick part 14c, even if an internal pressure rises, the curvature of the sealing plate 14 is suppressed. Thereby, in this cylindrical battery, when the internal pressure increases, an increase in the compression rate of the valve body 20 is suppressed, and an increase in the operating pressure is suppressed. As a result, in this cylindrical battery, even if the operating pressure set based on the compression rate of the valve body 20 at the time of assembly exceeds 3 MPa, the safety valve operates reliably at the set operating pressure.

一方、この円筒形電池では、封口板１４の外周部１４ｂを厚くする必要が無いため、封口板１４の外周部１４ｂを挟んでいる外装缶２の部分の高さが増大することはない。この結果として、外装缶２の外形寸法が同一であれば外装缶２内の容積が十分に確保され、この円筒形電池は、高容量化に適する。
更に、上述した円筒形電池では、厚肉部１４ｃの外径Ｄ１が外周部１４ｂの外径Ｄ２の６５％以上であることにより、内圧が上昇したときに、封口板１４の反りが確実に抑制される。この結果として、この円筒形電池では、内圧が上昇したときに、作動圧の上昇が確実に抑制される。 On the other hand, in this cylindrical battery, since it is not necessary to thicken the outer peripheral part 14b of the sealing plate 14, the height of the portion of the outer can 2 that sandwiches the outer peripheral part 14b of the sealing plate 14 does not increase. As a result, if the outer dimensions of the outer can 2 are the same, a sufficient volume in the outer can 2 is secured, and this cylindrical battery is suitable for increasing the capacity.
Further, in the above-described cylindrical battery, the outer diameter D1 of the thick wall portion 14c is 65% or more of the outer diameter D2 of the outer peripheral portion 14b, so that the warping of the sealing plate 14 is reliably suppressed when the internal pressure increases. Is done. As a result, in this cylindrical battery, when the internal pressure increases, the increase in operating pressure is reliably suppressed.

また更に、上述した円筒形電池では、厚肉部１４ｃと外周部１４ｂとの間にテーパ角θが４５度以下のテーパ部１４ｄを設けることにより、封口板１４に衝撃等が加わったときに、厚肉部１４ｃと外周部１４ｂとの境界近傍での応力集中が緩和される。この結果として、この円筒形電池の封口板１４は強度が確保され、変形し難い。   Furthermore, in the cylindrical battery described above, by providing a tapered portion 14d having a taper angle θ of 45 degrees or less between the thick portion 14c and the outer peripheral portion 14b, when an impact or the like is applied to the sealing plate 14, Stress concentration near the boundary between the thick portion 14c and the outer peripheral portion 14b is alleviated. As a result, the sealing plate 14 of this cylindrical battery has a sufficient strength and is not easily deformed.

１．作動圧の評価方法
表１に示したように、厚肉部及び外周部の厚さがそれぞれ０．６ｍｍ、０．４ｍｍであり、外周部の外径に対する厚肉部の外径の比率（外径比率）が異なる封口板を用いて、実施例１〜１５の封口体をそれぞれ３０個ずつ組み立てた。このとき封口板の外径及びテーパ部のテーパ角は、いずれも共通で、それぞれ１２．７ｍｍ、４０度であった。ＥＰＤＭ製の弁体の外径も共通であり、３．５ｍｍであった。また、正極端子の外径は５．５ｍｍで共通であったが、高さの異なる正極端子を用いることで、表１に示したように、弁体の圧縮率を変化させた。 1. Evaluation method of working pressure As shown in Table 1, the thickness of the thick part and the outer peripheral part is 0.6 mm and 0.4 mm, respectively, and the ratio of the outer diameter of the thick part to the outer diameter of the outer peripheral part (outside 30 sealing bodies of Examples 1 to 15 were each assembled using sealing plates having different diameter ratios. At this time, the outer diameter of the sealing plate and the taper angle of the taper portion were both common and were 12.7 mm and 40 degrees, respectively. The outer diameter of the EPDM valve body was also common and was 3.5 mm. Moreover, although the outer diameter of the positive electrode terminal was common at 5.5 mm, as shown in Table 1, the compressibility of the valve body was changed by using positive electrode terminals having different heights.

また、表１に示したように、厚肉部を有さず、厚さが０．４ｍｍで一定の封口板を用いたこと以外は実施例１〜５と同様にして、比較例１〜５の封口体を組み立てた。
組み立てた実施例１〜１５及び比較例１〜５の各封口体を、図４に示したワークホルダに固定し、ワークホルダ内に、窒素ガスボンベからレギュレータを通じて窒素ガスを導入した。これにより正極端子とは反対側から封口体に圧力を加え、安全弁の作動圧を測定した。なお、作動圧は、封口体の正極端子周辺に石鹸水を滴下しておき、泡が発生したときの圧力表示計の値として測定した。測定結果を、３０個の平均値として表１及び図５に示す。 Further, as shown in Table 1, Comparative Examples 1 to 5 were carried out in the same manner as in Examples 1 to 5 except that a constant sealing plate having a thickness of 0.4 mm was used without having a thick part. Assemble the sealing body.
The assembled sealing bodies of Examples 1 to 15 and Comparative Examples 1 to 5 were fixed to the work holder shown in FIG. 4, and nitrogen gas was introduced into the work holder through a regulator from a nitrogen gas cylinder. Thereby, pressure was applied to the sealing body from the side opposite to the positive electrode terminal, and the operating pressure of the safety valve was measured. The working pressure was measured as a pressure indicator value when bubbles were generated by dropping soap water around the positive electrode terminal of the sealing body. A measurement result is shown in Table 1 and FIG. 5 as an average value of 30 pieces.

Figure 2008251206
Figure 2008251206

２．強度測定方法
表２に示したように、テーパ角の異なる封口板を用いて封口体を組立てた。そして、得られた封口体を用いて、実施例１６〜１９として、単三サイズの円筒形ニッケル水素二次電池をそれぞれ５個ずつ製造した。このとき封口板の外径はいずれも共通で、１２．７ｍｍであった。封口板の厚肉部及び外周部の厚さもいずれも共通で、それぞれ０．６ｍｍ、０．４ｍｍであった。ＥＰＤＭ製の弁体の外径も共通であり、３．５ｍｍであった。また、正極端子の外径は、５．５ｍｍで共通であった。 2. Strength measurement method As shown in Table 2, sealing bodies were assembled using sealing plates having different taper angles. And using the obtained sealing body, as Example 16-19, 5 each of AA size cylindrical nickel-hydrogen secondary batteries were manufactured. At this time, the outer diameters of the sealing plates were the same and were 12.7 mm. The thickness of the thick part and the outer peripheral part of the sealing plate were both common, and were 0.6 mm and 0.4 mm, respectively. The outer diameter of the EPDM valve body was also common and was 3.5 mm. Moreover, the outer diameter of the positive electrode terminal was common at 5.5 mm.

一方、比較例として、厚肉部を有さず、厚さが０．４ｍｍで一定の封口板を用いたこと以外は実施例１６の場合と同様にして、比較例６の単三サイズの円筒形ニッケル水素二次電池を５個製造した。
得られた実施例１６〜２０及び比較例１の円筒形ニッケル水素二次電池を、正極端子を下に向けて、１ｍの高さから落下させた。落下前後での各電池の高さの変化量（全高変化量）を、５個の平均値として表２に示す。 On the other hand, as a comparative example, the AA size cylinder of Comparative Example 6 was used in the same manner as in Example 16 except that a constant sealing plate having a thickness of 0.4 mm was used without having a thick portion. Five nickel-metal hydride secondary batteries were produced.
The obtained cylindrical nickel metal hydride secondary batteries of Examples 16 to 20 and Comparative Example 1 were dropped from a height of 1 m with the positive electrode terminal facing downward. The amount of change in the height of each battery before and after dropping (total height change) is shown in Table 2 as an average value of five pieces.

Figure 2008251206
Figure 2008251206

３．評価結果
表１、表２及び図５から、以下のことが明らかである。
（１）実施例１〜１５と比較例１〜５とを比べると、封口板の中央に厚肉部を設けることにより、３．０ＭＰａ以上の領域でも、封口板の反りによる作動圧の上昇が抑制されることがわかる。特に、外径比率が６５％以上の実施例１〜１０では、作動圧の上昇が抑制され、弁体圧縮率に対して平均作動圧力が比例していることがわかる。
（２）実施例１６〜１９と比較例６とを比べると、テーパ部の角度を４５度以下にすることで、全高変化量の増加が抑制されていることがわかる。これは、４５度以下のテーパ部を設けたことで、落下の衝撃が厚肉部と外周部との境界領域に集中するのが緩和され、封口板の強度低下が抑制されたためと考えられる。 3. Evaluation Results From Tables 1 and 2 and FIG.
(1) Comparing Examples 1 to 15 and Comparative Examples 1 to 5, by providing a thick portion at the center of the sealing plate, the operating pressure rises due to the warping of the sealing plate even in the region of 3.0 MPa or more. It turns out that it is suppressed. In particular, in Examples 1 to 10 in which the outer diameter ratio is 65% or more, it is understood that the increase in the operating pressure is suppressed and the average operating pressure is proportional to the valve body compression rate.
(2) Comparing Examples 16 to 19 with Comparative Example 6, it can be seen that the increase in the total height change amount is suppressed by setting the angle of the tapered portion to 45 degrees or less. This is presumably because the provision of the tapered portion of 45 degrees or less mitigates the concentration of the drop impact in the boundary region between the thick wall portion and the outer peripheral portion, and suppresses the strength reduction of the sealing plate.

本発明は上記した一実施形態及び実施例に限定されることはなく、種々変形が可能であって、例えば、円筒形電池は、ニッケルカドミウム二次電池、リチウムイオン二次電池等であってもよく、また一次電池であってもよい。更に電池の外径寸法も特に限定されることはない。
一実施形態では、封口板の中央に環状の厚肉部を形成したけれども、厚肉部の形状は環状でなくてもよい。ただし、封口板の反りを確実に防止するためには、厚肉部の形状は環状であるのが好ましい。 The present invention is not limited to the above-described embodiment and examples, and various modifications are possible. For example, the cylindrical battery may be a nickel cadmium secondary battery, a lithium ion secondary battery, or the like. It may be a primary battery. Further, the outer diameter of the battery is not particularly limited.
In one embodiment, although the annular thick part was formed in the center of the sealing plate, the shape of the thick part may not be annular. However, in order to reliably prevent the sealing plate from warping, the shape of the thick portion is preferably annular.

一実施形態では、外周部の外径に対する厚肉部の外径の比率の上限は、電池の外径寸法によって変化するが、電池の外径寸法の変化を防止するため、かしめ加工により外装缶の開口端部によって挟まれる領域の手前に設定される。   In one embodiment, the upper limit of the ratio of the outer diameter of the thick portion to the outer diameter of the outer peripheral portion varies depending on the outer diameter size of the battery, but in order to prevent a change in the outer diameter size of the battery, the outer can can be formed by caulking. It is set in front of the region sandwiched between the opening ends of the.

本発明の一実施形態に係るニッケル水素二次電池の縦断面図である。It is a longitudinal cross-sectional view of the nickel-hydrogen secondary battery which concerns on one Embodiment of this invention. 図１の電池に適用した封口板の断面図である。It is sectional drawing of the sealing board applied to the battery of FIG. 図２の封口板の平面図である。It is a top view of the sealing board of FIG. 作動圧の測定方法を説明するための図である。It is a figure for demonstrating the measuring method of an operating pressure. 作動圧の測定結果を示すグラフである。It is a graph which shows the measurement result of a working pressure.

符号の説明Explanation of symbols

２ 外装缶
８ セパレータ
１０ 電極群
１４ 封口板
１４ａ ガス抜き孔
１４ｂ 外周部
１４ｃ 厚肉部
１４ｄ テーパ部
１６ 封口体 2 Outer can 8 Separator 10 Electrode group 14 Sealing plate 14a Degassing hole 14b Outer peripheral part 14c Thick part 14d Tapered part 16 Sealing body

Claims (3)

開口端部を有する円筒状の外装缶と、
前記外装缶内に収容された発電要素と、
前記外装缶の前記開口端部内に配置された封口板と、
前記外装缶の開口端部と前記封口板との間に設けられ、前記開口端部をかしめることにより前記封口板の外周部と前記開口端部との間をシールする電気絶縁性の環状のガスケットと、
前記封口板の中央に形成されたガス抜き孔と、
前記封口板の外面上に圧縮された状態で配置され、前記ガス抜き孔を作動圧まで閉塞する弾性材料からなる弁体と、
前記弁体を覆うカップ状の端子と
を備え、
前記封口板は、前記外周部よりも径方向内側に、前記外周部よりも厚い厚肉部を有する
ことを特徴とする円筒形電池。 A cylindrical outer can having an open end; and
A power generation element housed in the outer can,
A sealing plate disposed in the opening end of the outer can;
An electrically insulating annular seal is provided between the opening end of the outer can and the sealing plate, and seals between the outer peripheral portion of the sealing plate and the opening end by caulking the opening end. A gasket,
A vent hole formed in the center of the sealing plate;
A valve body made of an elastic material that is disposed in a compressed state on the outer surface of the sealing plate and closes the vent hole to an operating pressure;
A cup-shaped terminal covering the valve body,
The said sealing board has a thick part thicker than the said outer peripheral part inside radial direction rather than the said outer peripheral part, The cylindrical battery characterized by the above-mentioned. 前記厚肉部の外径は、前記封口板の外径の６５％以上であることを特徴とする請求項１に記載の円筒形電池。   2. The cylindrical battery according to claim 1, wherein an outer diameter of the thick portion is 65% or more of an outer diameter of the sealing plate. 前記封口板は、前記厚肉部と前記外周部との間に、径方向外側に向かうに連れて厚さが小さくなるテーパ部を更に有し、前記テーパ部のテーパ角は４５度以下であることを特徴とする請求項１又は２に記載の円筒形電池。   The sealing plate further includes a taper portion that decreases in thickness as it goes radially outward between the thick portion and the outer peripheral portion, and the taper angle of the taper portion is 45 degrees or less. The cylindrical battery according to claim 1 or 2, wherein the battery is a cylindrical battery.
JP2007087640A 2007-03-29 2007-03-29 Cylindrical battery Expired - Fee Related JP5137438B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972119A (en) * 2016-01-13 2017-07-21 比亚迪股份有限公司 A kind of cover plate assembly, the battery containing the cover plate assembly and battery pack

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003017029A (en) * 2001-06-29 2003-01-17 Sanyo Electric Co Ltd Sealing plate and weld-sealed battery using the same
JP2005259410A (en) * 2004-03-10 2005-09-22 Sanyo Electric Co Ltd Nonaqueous electrolyte secondary battery
JP2007273359A (en) * 2006-03-31 2007-10-18 Sanyo Electric Co Ltd Sealed battery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003017029A (en) * 2001-06-29 2003-01-17 Sanyo Electric Co Ltd Sealing plate and weld-sealed battery using the same
JP2005259410A (en) * 2004-03-10 2005-09-22 Sanyo Electric Co Ltd Nonaqueous electrolyte secondary battery
JP2007273359A (en) * 2006-03-31 2007-10-18 Sanyo Electric Co Ltd Sealed battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972119A (en) * 2016-01-13 2017-07-21 比亚迪股份有限公司 A kind of cover plate assembly, the battery containing the cover plate assembly and battery pack
CN106972119B (en) * 2016-01-13 2020-10-23 比亚迪股份有限公司 Cover plate assembly, battery containing cover plate assembly and battery pack

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