JP4951207B2 - Cylindrical sealed battery - Google Patents

Cylindrical sealed battery Download PDF

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JP4951207B2
JP4951207B2 JP2005032954A JP2005032954A JP4951207B2 JP 4951207 B2 JP4951207 B2 JP 4951207B2 JP 2005032954 A JP2005032954 A JP 2005032954A JP 2005032954 A JP2005032954 A JP 2005032954A JP 4951207 B2 JP4951207 B2 JP 4951207B2
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positive electrode
sealed battery
gasket
cylindrical sealed
sealing
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JP2006221909A (en
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修一 荒栄
千洋 村田
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FDK Energy Co Ltd
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Priority to DE112006000346.1T priority patent/DE112006000346B4/en
Priority to PCT/JP2006/301002 priority patent/WO2006085437A1/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147Lids or covers
    • H01M50/166Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/167Lids or covers characterised by the methods of assembling casings with lids by crimping
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147Lids or covers
    • H01M50/166Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183Sealing members
    • H01M50/184Sealing members characterised by their shape or structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183Sealing members
    • H01M50/186Sealing members characterised by the disposition of the sealing members
    • H01M50/188Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183Sealing members
    • H01M50/19Sealing members characterised by the material
    • H01M50/193Organic material
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

この発明は、発電要素を収容した有底筒状正極缶と、この正極缶の開口部内側面と負極端子板との間の介在する環状封口ガスケットとを有する筒形密閉電池に関し、たとえば、筒形やボビン形のリチウム電池に適用して有効である。   The present invention relates to a cylindrical sealed battery having a bottomed cylindrical positive electrode can containing a power generation element and an annular sealing gasket interposed between an inner surface of an opening of the positive electrode can and a negative electrode terminal plate. And is effective when applied to lithium batteries of bobbin type.

たとえば特許文献1や2等に開示されている筒形密閉電池は、図2に示すように、発電要素20を収容した正極缶11’の開口部を、この正極缶11’の開口部内側面と負極端子板27の外周縁部との間の介在する環状封口ガスケット32’を用いて密閉封止している。   For example, as shown in FIG. 2, the cylindrical sealed battery disclosed in Patent Documents 1 and 2 and the like has an opening of the positive electrode can 11 ′ containing the power generation element 20 as an inner surface of the opening of the positive electrode can 11 ′. The annular sealing gasket 32 ′ interposed between the outer peripheral edge of the negative electrode terminal plate 27 is hermetically sealed.

正極缶11’は有底筒状であって、その外底面には凸状の正極端子部12がプレス加工により形成されている。正極缶11には、ガスケット32’を下方から支持するビーディング部13と、ガスケット32’を外方から圧迫するかしめ部(カール加工部)14’とが形成されている。ガスケット32’の材質としてはポリオレフィン系樹脂が従来使用されていた。   The positive electrode can 11 ′ has a bottomed cylindrical shape, and a convex positive electrode terminal portion 12 is formed on the outer bottom surface thereof by pressing. The positive electrode can 11 is formed with a beading portion 13 for supporting the gasket 32 ′ from below and a caulking portion (curled portion) 14 ′ for pressing the gasket 32 ′ from the outside. As a material for the gasket 32 ', a polyolefin resin has been conventionally used.

図示例の筒形密閉電池は、負極作用物質23としてリチウムを用いた筒形リチウム電池であって、この負極作用物質23がセパレータ22および正極作用物質21と共に正極缶11’内に装填されて非水電解液に浸漬されている。   The cylindrical sealed battery of the illustrated example is a cylindrical lithium battery using lithium as the negative electrode active material 23. The negative electrode active material 23 is loaded into the positive electrode can 11 ′ together with the separator 22 and the positive electrode active material 21 and is not non-conductive. It is immersed in a water electrolyte.

正極缶11’は正極集電子および正極端子を兼ねる。負極作用物質23には負極集電体24に圧着し、この負極集電体24は負極集電リード25を介して金属製封口板26に導電接続されている。封口板26は負極端子板27と正極缶11’内との間を気密隔離するものであって、その周辺部は負極端子板27と封口ガスケット32’の間に挟持されている。
特開2000−315497 特開2003−208906
The positive electrode can 11 ′ also serves as a positive electrode current collector and a positive electrode terminal. The negative electrode active material 23 is pressure-bonded to a negative electrode current collector 24, and the negative electrode current collector 24 is conductively connected to a metal sealing plate 26 via a negative electrode current collector lead 25. The sealing plate 26 hermetically isolates the negative electrode terminal plate 27 and the inside of the positive electrode can 11 ′, and the periphery thereof is sandwiched between the negative electrode terminal plate 27 and the sealing gasket 32 ′.
JP 2000-315497 A JP 2003-208906 A

上述した筒形密閉手電池について、本発明者らは、とくに高温環境下での保存や使用に対応するための耐熱性について検証したところ、次のような問題のあることがあきらかとなった。   Regarding the above-described cylindrical sealed hand battery, the present inventors have verified the heat resistance to cope with the storage and use particularly in a high temperature environment, and it has become clear that there are the following problems.

すなわち、電池をたとえば95℃以上の高温環境下に放置すると、ポリオレフィン系樹脂製のガスケット32’が脆化して漏液が生じやすくなる。また、正極缶11’とガスケット32間に隙間が生じやすく、これも漏液の原因となる。正極缶11’の開口端部はガスケット32’を外方が圧迫するべくかしめ加工されるが、このかしめ部14’とガスケット32’の間に隙間が生じて耐漏液性を低下させていることが判明した。   That is, if the battery is left in a high temperature environment of, for example, 95 ° C. or higher, the polyolefin resin gasket 32 ′ becomes brittle and liquid leakage tends to occur. Further, a gap is easily generated between the positive electrode can 11 ′ and the gasket 32, which also causes liquid leakage. The open end of the positive electrode can 11 ′ is crimped so as to press the gasket 32 ′ outward, and a gap is formed between the crimped portion 14 ′ and the gasket 32 ′ to reduce leakage resistance. There was found.

従来においては、ガスケットのシール機能を高めるために、ガスケットにポリブテンを用いたシール剤を塗布することが行われていた。しかし、このシール剤も高環境下では十分な効果を得られないことが判明した。つまり、耐熱性を高めることはできなかった。   Conventionally, in order to enhance the sealing function of the gasket, a sealing agent using polybutene has been applied to the gasket. However, it has been found that this sealing agent cannot obtain a sufficient effect even in a high environment. That is, the heat resistance could not be improved.

一方、ガスケットの耐熱性を高める手段としては、PTEEやPFAのようなフッ素系樹脂の使用が有効であることが知られている。しかし、フッ素系樹脂は耐熱性にすぐれてはいるが、非常に高コストであるという問題がある。   On the other hand, it is known that the use of a fluorine-based resin such as PTEE or PFA is effective as means for increasing the heat resistance of the gasket. However, although the fluororesin is excellent in heat resistance, there is a problem that it is very expensive.

この発明は以上のような技術背景および問題を鑑みたものであって、その目的は、ガスケットの材質に高コストなフッ素系樹脂を使わず、低コスト化に適した材質および構成でもって、高温環境下での保存や使用に対応可能な耐熱性を備えた筒形密閉電池を提供することにある。   The present invention has been made in view of the technical background and problems as described above, and its object is not to use a high-cost fluorine-based resin for the gasket material, but to use a high-temperature material and configuration suitable for cost reduction. An object of the present invention is to provide a cylindrical sealed battery having heat resistance capable of being stored and used in an environment.

本発明の上記以外の目的および構成については、本明細書の記述および添付図面からあきらかになるであろう。   Other objects and configurations of the present invention will become apparent from the description of the present specification and the accompanying drawings.

本発明による手段は次のとおりである。
(1)発電要素を収容する有底筒状正極缶と、この正極缶の開口部内側面と負極端子板との間の介在する環状封口ガスケットとを有する筒形密閉電池であって、
上記正極缶には、上記ガスケットを下方から支持するビーディング部と、上記ガスケットを外方から圧迫するかしめ部とが形成され、
前記環状封口ガスケットは、チタン酸カリウム添加されたポリプロピレンを主材質としているとともに、外周面および内周面にシール剤塗布され
上記シール剤は、アスファルトと鉱物油の混合体である、
ことを特徴とする筒形密閉電池。
Means according to the present invention are as follows.
(1) a bottomed cylindrical positive electrode canister that houses the power generating element, a cylindrical sealed battery that have a annular sealing gasket interposed between the opening side of the positive electrode can and the negative electrode terminal plate,
In the positive electrode can, a beading portion that supports the gasket from below and a caulking portion that presses the gasket from the outside are formed,
The annular sealing gasket is mainly made of polypropylene to which potassium titanate is added , and a sealing agent is applied to the outer peripheral surface and the inner peripheral surface,
The sealing agent is a mixture of asphalt and mineral oil .
A cylindrical sealed battery characterized by that.

上記手段(1)は、さらに次のような手段を形成することにより、さらに有効な効果が得ることができる。
(2)シール剤として、アスファルトの1に対して鉱物油が1〜3の重量比で混合したシール剤を用いたことを特徴とする手段(1)に記載の筒形密閉電池。
The above means (1) can obtain more effective effects by forming the following means.
(2) The cylindrical sealed battery according to means (1), wherein a sealing agent in which mineral oil is mixed at a weight ratio of 1 to 3 with 1 of asphalt is used as the sealing agent.

(3)正極缶の材質がSUS304のステンレススチールであって、その板厚は0.2〜0.3mmであり、かつ、かしめ部を形成する湾曲部の長さが1.2〜1.6mmとなるように形成されていることを特徴とする手段(1)または(2)に記載の筒形密閉電池。   (3) The material of the positive electrode can is SUS304 stainless steel, the plate thickness is 0.2 to 0.3 mm, and the length of the curved portion forming the caulking portion is 1.2 to 1.6 mm. The cylindrical sealed battery according to means (1) or (2), wherein the cylindrical sealed battery is formed to be

(4)正極缶の材質硬度が150Hv〜180Hvであることを特徴とする手段(1)〜(3)のいずれかに記載の筒形密閉電池。   (4) The cylindrical sealed battery according to any one of means (1) to (3), wherein the positive electrode can has a material hardness of 150 Hv to 180 Hv.

(5)正極缶に収容された発電要素の負極リードが導電接続され、かつ負極端子板と正極缶内との間を隔離する金属製封口板を有し、この封口板の周辺部が負極端子板と封口ガスケットの間に挟持されていることを特徴とする手段(1)〜(4)のいずれかに記載の筒形密閉電池。   (5) The negative electrode lead of the power generation element housed in the positive electrode can is conductively connected, and has a metal sealing plate that separates the negative electrode terminal plate from the inside of the positive electrode can, and the periphery of the sealing plate is the negative electrode terminal The cylindrical sealed battery according to any one of means (1) to (4), which is sandwiched between a plate and a sealing gasket.

ガスケットの材質に高コストなフッ素系樹脂を使わず、低コスト化に適した材質および構成でもって、高温環境下での保存や使用に対応可能な耐熱性を備えた筒形密閉電池を提供することができる。   Providing a sealed cylindrical battery with heat resistance that can be stored and used in high-temperature environments with a material and configuration suitable for cost reduction, without using high-cost fluorocarbon resin as the gasket material. be able to.

上記以外の作用/効果については、本明細書の記述および添付図面からあきらかになるであろう。   Operations / effects other than those described above will be apparent from the description of the present specification and the accompanying drawings.

図1は、本発明の技術が適用された筒形密閉電池の断面図とその部分拡大図を示す。同図に示す実施形態の電池は、負極作用物質23としてリチウムを用いた筒形(あるいはボビン形)リチウム電池であって、この負極作用物質23がセパレータ22および正極作用物質21と共に正極缶11内に装填されて非水電解液に浸漬されることにより、発電要素20が形成される。   FIG. 1 shows a cross-sectional view and a partially enlarged view of a cylindrical sealed battery to which the technology of the present invention is applied. The battery of the embodiment shown in the figure is a cylindrical (or bobbin-type) lithium battery using lithium as the negative electrode active material 23, and the negative electrode active material 23 together with the separator 22 and the positive electrode active material 21 is in the positive electrode can 11. And the power generation element 20 is formed by being immersed in the non-aqueous electrolyte.

発電要素20を収容する正極缶11は有底筒状であって、環状封口ガスケット32を用いて密閉封止されている。ガスケット32は、正極缶11の開口部内側面と負極端子板27の外周縁部との間の介在させられている。   The positive electrode can 11 that houses the power generation element 20 has a bottomed cylindrical shape and is hermetically sealed using an annular sealing gasket 32. The gasket 32 is interposed between the inner surface of the opening of the positive electrode can 11 and the outer peripheral edge of the negative terminal plate 27.

正極缶11は深絞りプレス加工により形成され、その外底面には凸状の正極端子部12が一体形成されている。この正極缶11には、ガスケット32を下方から支持するビーディング部13と、ガスケット32を外方から圧迫するかしめ部(カール加工部)14とが形成されている。   The positive electrode can 11 is formed by deep drawing press processing, and a convex positive electrode terminal portion 12 is integrally formed on the outer bottom surface thereof. The positive electrode can 11 is formed with a beading portion 13 for supporting the gasket 32 from below and a caulking portion (curling portion) 14 for pressing the gasket 32 from the outside.

この場合、そのかしめ部14は、正極缶11の開口端からの長さLrが1.2〜1.6mmとなるように形成されている。つまり、かしめ部14を形成する湾曲部の長さLrが1.2〜1.6mmの範囲となるようにかしめ加工されている。   In this case, the caulking portion 14 is formed so that the length Lr from the open end of the positive electrode can 11 is 1.2 to 1.6 mm. That is, it is caulked so that the length Lr of the curved portion forming the caulking portion 14 is in the range of 1.2 to 1.6 mm.

正極缶11の材質には、SUS304のステンレススチールで、材質硬度が150Hv〜180Hvのものが使用されている。また、板厚は0.2〜0.3mmのものが使用されている。   The material of the positive electrode can 11 is SUS304 stainless steel having a material hardness of 150 Hv to 180 Hv. The plate thickness is 0.2 to 0.3 mm.

ガスケット32は、主材質としてチタン酸カリウムを添加したポリプロピレンを使用して構成されている。チタン酸カリウムは微粉状のものがポリプロピレンに対して重量比で30%ほど添加されている。このガスケット32の外周面および内周面にはシール剤41が塗布されている。このシール剤41にはアスファルトと鉱物油の混合体が使用されている。この混合体は、アスファルトの1に対して鉱物油が1〜3の重量比で混合したものがとくに好適である。   The gasket 32 is configured using polypropylene added with potassium titanate as a main material. About 30% by weight of potassium titanate is added in a fine powder form with respect to polypropylene. A sealing agent 41 is applied to the outer peripheral surface and inner peripheral surface of the gasket 32. As the sealant 41, a mixture of asphalt and mineral oil is used. This mixture is particularly preferably a mixture of mineral oil at a weight ratio of 1 to 3 to 1 of asphalt.

さらに、図示の実施形態では、負極端子板27と正極缶11内との間を金属製封口板26が気密隔離している。このため、封口板26は、その周辺部が負極端子板27と封口ガスケット32の間に挟持されている。これにより、封口板26と負極端子板27間は導電接続されている。   Further, in the illustrated embodiment, a metal sealing plate 26 is hermetically isolated between the negative electrode terminal plate 27 and the inside of the positive electrode can 11. For this reason, the periphery of the sealing plate 26 is sandwiched between the negative terminal plate 27 and the sealing gasket 32. Thereby, the sealing plate 26 and the negative terminal plate 27 are conductively connected.

上記封口板26の内側面(発電要素20側面)には負極リード25がスポット溶接等により導電接続されている。負極リード25は、負極作用物質23に圧着するネット状の負極集電体24に導電接続されている。   A negative electrode lead 25 is conductively connected to the inner side surface (side surface of the power generation element 20) of the sealing plate 26 by spot welding or the like. The negative electrode lead 25 is conductively connected to a net-like negative electrode current collector 24 that is bonded to the negative electrode active material 23.

上述した筒形密閉電池では、ガスケット32の主材質としてチタン酸カリウムを添加したポリプロピレンを使用している。この主材質は、フッ素系樹脂等に比べて大幅に低コストな材料であるが、ガスケット32として使用したときに、高温環境下でも脆化を生じ難いことが判明した。   In the above cylindrical sealed battery, polypropylene added with potassium titanate is used as the main material of the gasket 32. This main material is a material that is significantly lower in cost than fluorine-based resin or the like, but when used as the gasket 32, it has been found that embrittlement hardly occurs even in a high temperature environment.

また、ガスケット32の外周面および内周面に塗布したシール剤41も、ガスケット32が高温環境下で脆化するのを防ぐ効果のあることが判明した。これは、シール剤41としてアスファルトと鉱物油の混合体を用いたことによる。鉱物油としてはタービン油が好適に使用できる。この実施形態では新日本石油製の「FBKタービン32」を使用した。   It has also been found that the sealing agent 41 applied to the outer peripheral surface and inner peripheral surface of the gasket 32 has an effect of preventing the gasket 32 from becoming brittle in a high temperature environment. This is because a mixture of asphalt and mineral oil was used as the sealant 41. Turbine oil can be suitably used as the mineral oil. In this embodiment, “FBK turbine 32” manufactured by Nippon Oil Corporation was used.

上記シール剤41と上記ガスケット32の主材質との相乗効果により、電池の耐熱性を大幅に向上させることができた。これにより、ガスケットの材質に高コストなフッ素系樹脂を使わず、低コスト化に適した材質および構成でもって、高温環境下での保存や使用に対応可能な耐熱性を備えた筒形密閉電池を提供することができる。   Due to the synergistic effect of the sealing material 41 and the main material of the gasket 32, the heat resistance of the battery could be greatly improved. As a result, the sealed cylindrical battery is heat-resistant and can be stored and used in high-temperature environments with a material and configuration suitable for cost reduction, without using high-cost fluorine-based resin for the gasket material. Can be provided.

さらに、本発明では、正極缶11の板厚、材質硬度、かしめ部14の長さLrについて、それぞれ次のような特異的な最適条件が存在することが、本発明者らによりあきらかにされた。   Further, in the present invention, the present inventors have revealed that the following specific optimum conditions exist for the plate thickness, material hardness, and caulking portion length Lr of the positive electrode can 11 respectively. .

すなわち、正極缶11の板厚については、0.2〜0.3mmが最適範囲となる。0.2mm未満では、ビーディング加工時に缶が切れるという不具合が生じる。また、この板厚(0.2mm未満)のステンレスだと、深絞り加工による正極缶の製造が困難になる。一方、その板厚が0.3mmを超えると、正極缶の内容積が小さくなり、電極材料の充填容量(発電容積)が減って電池性能が低下する。   That is, the optimal range for the plate thickness of the positive electrode can 11 is 0.2 to 0.3 mm. If it is less than 0.2 mm, a problem that the can is cut during beading occurs. In addition, when the plate thickness (less than 0.2 mm) is used, it becomes difficult to manufacture a positive electrode can by deep drawing. On the other hand, when the plate thickness exceeds 0.3 mm, the internal volume of the positive electrode can is reduced, the filling capacity (power generation volume) of the electrode material is reduced, and the battery performance is lowered.

正極缶11の材質硬度については、150Hv〜180Hvが最適範囲となる。150Hv未満では、かしめ加工(カール加工)時に正極缶の開口端にめくれが生じやすくなる。一方、180Hvを超えると、かしめ加工時にビーディング部13が座屈(ざくつ)する問題が生じるようになる。   About the material hardness of the positive electrode can 11, 150Hv-180Hv becomes an optimal range. If it is less than 150 Hv, the opening end of the positive electrode can tends to be turned during caulking (curling). On the other hand, when it exceeds 180 Hv, the problem that the beading part 13 buckles at the time of caulking will come to occur.

かしめ部14の長さLrについては、1.2〜1.6mmが最適範囲となる。1.2mm未満では、かしめ加工時に座屈が生じやすい、ガスケットが切れたり割れたりする、ガスケットと正極缶の間に隙間(図2参照)ができる、などの問題が生じる。一方、その長さLrが1.6mmを超えると、ガスケットを圧迫する力が分散して封口が緩くなり、漏液が生じやすくなる。また、異常な衝撃等により負極端子板等の封口部材が抜けるといった問題も生じるようになる。   About the length Lr of the caulking part 14, 1.2-1.6mm becomes an optimal range. If the thickness is less than 1.2 mm, buckling is likely to occur during caulking, the gasket is cut or cracked, and a gap (see FIG. 2) is formed between the gasket and the positive electrode can. On the other hand, when the length Lr exceeds 1.6 mm, the force compressing the gasket is dispersed, the sealing is loosened, and liquid leakage is likely to occur. In addition, there arises a problem that the sealing member such as the negative electrode terminal plate comes off due to an abnormal impact or the like.

本発明の構成を備えた筒形密閉電池と、同タイプの従来電池をそれぞれ複数サンプル作製した。本発明品と従来品をそれぞれ95℃の高温環境下で保存し、その保存日数と重量減量値を調べる試験を行った。この場合、重量減量値は電解液の漏液に関係し、封止力が弱い電池ほど多くなる。   A plurality of samples of a cylindrical sealed battery having the configuration of the present invention and a conventional battery of the same type were produced. The product of the present invention and the conventional product were each stored in a high temperature environment of 95 ° C., and a test was conducted to check the storage days and weight loss values. In this case, the weight loss value is related to the leakage of the electrolytic solution, and increases as the battery has a lower sealing force.

この試験にて、95℃20日保存後の重量減量値は、従来品が50mgであったのに対し、本発明品は20mgであった。また、40日保存後は、従来品で漏液するものがあった。漏液しないものでも重量減量値は100mgに達した。これに対し、本発明品で漏液したものはなく、重量減量値も45mgまでと少なかった。   In this test, the weight loss after storage at 95 ° C. for 20 days was 50 mg for the conventional product, but 20 mg for the product of the present invention. Further, after 40 days of storage, some of the conventional products leaked. Even if the liquid did not leak, the weight loss value reached 100 mg. On the other hand, there was no leakage of the product of the present invention, and the weight loss value was as low as 45 mg.

以上、本発明をその代表的な実施例に基づいて説明したが、本発明は上述した以外にも種々の態様が可能である。たとえば、本発明は筒形あるいはボビン形リチウム電池に用いてとくに有効であるが、リチウム電池以外の筒形密閉電池にも有効に適用可能である。   As mentioned above, although this invention was demonstrated based on the typical Example, this invention can have various aspects other than having mentioned above. For example, the present invention is particularly effective when used for a cylindrical or bobbin type lithium battery, but can also be effectively applied to a cylindrical sealed battery other than a lithium battery.

ガスケットの材質に高コストなフッ素系樹脂を使わず、低コスト化に適した材質および構成でもって、高温環境下での保存や使用に対応可能な耐熱性を備えた筒形密閉電池を提供することができる。   Providing a sealed cylindrical battery with heat resistance that can be stored and used in high-temperature environments with a material and configuration suitable for cost reduction, without using high-cost fluorocarbon resin as the gasket material. be able to.

本発明の一実施形態である筒形密閉電池の断面図とその部分拡大図である。It is sectional drawing of the cylindrical sealed battery which is one Embodiment of this invention, and its partial enlarged view. 従来の筒形密閉電池の断面図とその部分拡大図である。It is sectional drawing of the conventional cylindrical sealed battery, and its partial enlarged view.

符号の説明Explanation of symbols

11 正極缶
12 正極端子部
13 ビーディング部
14 かしめ部(カール加工部)
20 発電要素
21 正極作用物質
22 セパレータ
23 負極作用物質
24 負極集電体
25 負極リード
26 封口板
27 負極端子板
32 封口ガスケット
41 シール剤
11 Positive electrode can 12 Positive electrode terminal portion 13 Beading portion 14 Caulking portion (curled portion)
DESCRIPTION OF SYMBOLS 20 Electric power generation element 21 Positive electrode active substance 22 Separator 23 Negative electrode active substance 24 Negative electrode collector 25 Negative electrode lead 26 Sealing board 27 Negative electrode terminal board 32 Sealing gasket 41 Sealing agent

Claims (5)

発電要素を収容する有底筒状正極缶と、この正極缶の開口部内側面と負極端子板との間の介在する環状封口ガスケットとを有する筒形密閉電池であって、
上記正極缶には、上記ガスケットを下方から支持するビーディング部と、上記ガスケットを外方から圧迫するかしめ部とが形成され、
前記環状封口ガスケットは、チタン酸カリウム添加されたポリプロピレンを主材質としているとともに、外周面および内周面にシール剤塗布され
上記シール剤は、アスファルトと鉱物油の混合体である、
ことを特徴とする筒形密閉電池。
A bottomed cylindrical positive electrode canister that houses the power generating element, a cylindrical sealed battery that have a annular sealing gasket interposed between the opening side of the positive electrode can and the negative electrode terminal plate,
In the positive electrode can, a beading portion that supports the gasket from below and a caulking portion that presses the gasket from the outside are formed,
The annular sealing gasket is mainly made of polypropylene to which potassium titanate is added , and a sealing agent is applied to the outer peripheral surface and the inner peripheral surface,
The sealing agent is a mixture of asphalt and mineral oil .
A cylindrical sealed battery characterized by that.
シール剤として、アスファルトの1に対して鉱物油が1〜3の重量比で混合したシール剤を用いたことを特徴とする請求項1に記載の筒形密閉電池。   2. The cylindrical sealed battery according to claim 1, wherein a sealing agent in which mineral oil is mixed in a weight ratio of 1 to 3 to asphalt 1 is used as the sealing agent. 正極缶の材質がSUS304のステンレススチールであって、その板厚は0.2〜0.3mmであり、かつ、かしめ部を形成する湾曲部の長さが1.2〜1.6mmとなるように形成されていることを特徴とする請求項1または2に記載の筒形密閉電池。   The material of the positive electrode can is SUS304 stainless steel, the plate thickness is 0.2 to 0.3 mm, and the length of the curved portion forming the caulking portion is 1.2 to 1.6 mm. The cylindrical sealed battery according to claim 1, wherein the cylindrical sealed battery is formed. 正極缶の材質硬度が150Hv〜180Hvであることを特徴とする請求項1〜3のいずれかに記載の筒形密閉電池。   The cylindrical sealed battery according to claim 1, wherein the positive electrode can has a material hardness of 150 Hv to 180 Hv. 正極缶に収容された発電要素の負極リードが導電接続され、かつ負極端子板と正極缶内との間を隔離する金属製封口板を有し、この封口板の周辺部が負極端子板と封口ガスケットの間に挟持されていることを特徴とする請求項1〜4のいずれかに記載の筒形密閉電池。

The negative electrode lead of the power generation element housed in the positive electrode can is conductively connected, and has a metal sealing plate that separates the negative electrode terminal plate and the inside of the positive electrode can, and the periphery of the sealing plate is the negative electrode terminal plate and the sealing member The cylindrical sealed battery according to any one of claims 1 to 4, wherein the cylindrical sealed battery is sandwiched between gaskets.

JP2005032954A 2005-02-09 2005-02-09 Cylindrical sealed battery Active JP4951207B2 (en)

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PCT/JP2006/301002 WO2006085437A1 (en) 2005-02-09 2006-01-24 Cylindrical sealed cell

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WO2006085437A1 (en) 2006-08-17
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