JP2000277063A - Sealed battery - Google Patents
Sealed batteryInfo
- Publication number
- JP2000277063A JP2000277063A JP11085732A JP8573299A JP2000277063A JP 2000277063 A JP2000277063 A JP 2000277063A JP 11085732 A JP11085732 A JP 11085732A JP 8573299 A JP8573299 A JP 8573299A JP 2000277063 A JP2000277063 A JP 2000277063A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- sealing plate
- sealing
- sealed battery
- external gasket
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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、内部に発電要素が
収納された有底筒状の外装缶を有し、この外装缶の開口
部には、外部ガスケットを介して、周縁部が略Ｕ字状に
折り曲げられた封止板を備えた封口体がかしめ固定され
る構造の密閉型電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a bottomed cylindrical outer can in which a power generating element is housed, and the outer edge of the outer can is substantially U-shaped through an external gasket. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery having a structure in which a sealing body provided with a sealing plate bent in a letter shape is fixed by caulking.
【０００２】[0002]
【従来の技術】近年、ＬｉＣｏＯ2 等のリチウム含有複
合酸化物を正極材料とする一方、金属リチウム又はリチ
ウムイオンを吸蔵、放出し得る合金又は炭素材料を負極
材料とするリチウムイオン電池が、高容量化が可能な電
池として注目されている。このようにリチウムイオン電
池は優れた性能を有するということから、円筒型形状の
密閉型電池等に用いられている。 2. Description of the Related Art In recent years, lithium ion batteries using a lithium-containing composite oxide such as LiCoO 2 as a positive electrode material and an alloy or a carbon material capable of occluding and releasing lithium metal or lithium ions as a negative electrode material have been developed to have a high capacity. It is attracting attention as a battery that can be converted. As described above, the lithium ion battery has excellent performance, and thus is used for a cylindrical sealed battery and the like.
【０００３】ここで、上記リチウムイオン電池の具体的
な構造は、図５に示すように、内部に発電要素３０が収
納された有底筒状の外装缶３１を有し、この外装缶３１
の開口部には、外部ガスケット３３を介して、周縁部が
略Ｕ字状に折り曲げられた封止板３４を有する封口体３
２がかしめ固定される構造となっている。ところが、上
記封止板３４の周縁部を略Ｕ字状に折り曲げる際、全て
の封止板３４の形状が同一形状にするような加工は困難
であった。このため、封止板３４と外部ガスケット３３
との間或いは外部ガスケット３３と外装缶３１との間の
シール性能にバラツキが生じることがある。したがっ
て、シール性能が低い場合、封止板３４と外部ガスケッ
ト３３との間或いは外部ガスケット３３と外装缶３１と
の間を通って電解液が電池外に大量に排出され、電池外
に存在する保護回路等を破損するおそれがあった。この
ような不都合は、電池の保存温度が大きく変化するよう
な場合に、特に生じやすくなる。なぜなら、低温では外
部ガスケット３３は収縮し、高温では外部ガスケット３
３は膨張するため、このようなことを繰り返すと、外部
ガスケット３３が徐々に劣化してシール性能が一層低下
するからである。更に、電池が落下した場合には、その
衝撃により封止板３４が変形することがあるが、このよ
うな変形が生じると、やはり封止板３４と外部ガスケッ
ト３３との間或いは外部ガスケット３３と外装缶３１と
の間のシール性能が低下して、電解液が電池外に大量に
排出されることになっていた。Here, a specific structure of the above-mentioned lithium ion battery has a bottomed cylindrical outer can 31 in which a power generating element 30 is housed, as shown in FIG.
A sealing body 3 having a sealing plate 34 whose peripheral portion is bent in a substantially U-shape through an external gasket 33
2 has a structure that is fixed by caulking. However, when the peripheral portion of the sealing plate 34 is bent into a substantially U-shape, it is difficult to make all the sealing plates 34 have the same shape. Therefore, the sealing plate 34 and the external gasket 33
Or the sealing performance between the external gasket 33 and the outer can 31 may vary. Therefore, when the sealing performance is low, a large amount of the electrolyte is discharged out of the battery through the space between the sealing plate 34 and the external gasket 33 or between the external gasket 33 and the outer can 31, and the protection existing outside the battery is prevented. There was a risk of damaging circuits and the like. Such inconvenience is particularly likely to occur when the storage temperature of the battery changes significantly. This is because the external gasket 33 contracts at low temperatures and the external gasket 3 at high temperatures.
3 is expanded, and when such a process is repeated, the external gasket 33 is gradually deteriorated, and the sealing performance is further reduced. Further, when the battery falls, the sealing plate 34 may be deformed due to the impact. When such deformation occurs, the sealing plate 34 and the external gasket 33 or the external gasket 33 may be deformed. The sealing performance with the outer can 31 deteriorated, and a large amount of the electrolyte was discharged outside the battery.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、以上の事情
に鑑みなされたものであって、例え電池の保存温度が大
きく変化したり、電池が落下した場合であっても、封止
板と外部ガスケットとの間或いは外部ガスケットと外装
缶との間のシール性能が低下するのを抑制して、電解液
が電池外に排出されるのを抑えることにより、電池外に
存在する保護回路等の破損を防止することができる密閉
型電池の提供を目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and even if the storage temperature of a battery changes greatly or the battery falls, the sealing plate can be used. By suppressing the deterioration of the sealing performance between the external gasket or between the external gasket and the outer can, and suppressing the discharge of the electrolyte out of the battery, the protection circuit and the like existing outside the battery can be prevented. An object of the present invention is to provide a sealed battery capable of preventing breakage.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明のうちで請求項１記載の発明は、内部に発電
要素が収納された有底筒状の外装缶を有し、この外装缶
の開口部には、外部ガスケットを介して、周縁部が略Ｕ
字状に折り曲げられた封止板を備えた封口体がかしめ固
定される構造の密閉型電池において、上記封止板と上記
外部ガスケットとの接触部位における封止板には、凹部
及び／又は凸部が形成されていることを特徴とする。こ
のように、封止板に凹部及び／又は凸部が形成されてい
れば、当該部位において他の部位に比べて外部ガスケッ
トの付勢力が十分に発揮されると共に外部ガスケットが
十分に保持されるので、シール性能の向上が図られるこ
とになる。したがって、例え電池の保存温度が大きく変
化したり、電池が落下した場合であっても、電解液が電
池外に排出されるのを抑えることができるので、電池外
に存在する保護回路等の破損を防止することが可能とな
る。Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 of the present invention has a bottomed cylindrical outer can in which a power generating element is housed. At the opening of the outer can, the outer edge is substantially U
In a sealed battery having a structure in which a sealing body provided with a sealing plate bent in a letter shape is fixed by caulking, a sealing plate at a contact portion between the sealing plate and the external gasket has a concave portion and / or a convex portion. A part is formed. As described above, when the concave portion and / or the convex portion are formed in the sealing plate, the urging force of the external gasket is sufficiently exerted in the portion compared to other portions, and the external gasket is sufficiently held. Therefore, the sealing performance is improved. Therefore, even if the storage temperature of the battery greatly changes or the battery falls, the electrolyte can be prevented from being discharged to the outside of the battery. Can be prevented.
【０００６】また、請求項２記載の発明は、請求項１記
載の発明において、上記凹部及び／又は凸部が、かしめ
代内に形成されていることを特徴とする。このように規
制するのは、凹部及び／又は凸部が、かしめ代内にない
ような場合には、外部ガスケットの付勢力が十分に発揮
されず、シール性能を飛躍的に向上することができない
おそれがあるからである。According to a second aspect of the present invention, in the first aspect of the present invention, the concave portion and / or the convex portion are formed in a swaging margin. The reason for this restriction is that when the concave portion and / or the convex portion are not within the caulking allowance, the urging force of the external gasket is not sufficiently exerted, and the sealing performance cannot be significantly improved. This is because there is a fear.
【０００７】また、請求項３記載の発明は、請求項１又
は２記載の発明において、上記凹部及び／又は凸部が複
数形成されていることを特徴とする。このような構成で
あれば、上記の効果が一層発揮される。According to a third aspect of the present invention, in the first or second aspect, a plurality of the concave portions and / or the convex portions are formed. With such a configuration, the above-described effects are further exhibited.
【０００８】[0008]
【発明の実施の形態】本発明の実施の形態を、図１〜図
４に基づいて、以下に説明する。図１は本発明の一例に
係るリチウムイオン電池の分解斜視図、図２は本発明電
池に用いる封口体の拡大半断面図、図３は本発明電池に
用いる他の例に係る封口体の拡大半断面図、図４は本発
明電池に用いる更に他の例に係る封口体の拡大半断面図
である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an exploded perspective view of a lithium ion battery according to an example of the present invention, FIG. 2 is an enlarged half cross-sectional view of a sealing body used in the battery of the present invention, and FIG. 3 is an enlarged view of a sealing body according to another example used in the battery of the present invention. FIG. 4 is a half sectional view showing an enlarged half sectional view of a sealing body according to still another example used in the battery of the present invention.
【０００９】図１に示すように、本発明の一例に係るリ
チウムイオン電池は、有底円筒状の外装缶５を有してお
り、この外装缶５内には、アルミニウムから成る芯体に
ＬｉＣｏＯ2 を主体とする活物質層が形成された正極１
と、銅から成る芯体に黒鉛を主体とする活物質層が形成
された負極２と、これら両電極１・２を離間するセパレ
ータ３とから成る渦巻き状の発電要素４が収納されてい
る。また、上記外装缶５内には、エチレンカーボネート
（ＥＣ）とジメチルカーボネート（ＤＭＣ）とが体積比
で４：６の割合で混合された混合溶媒に、ＬｉＰＦ6 が
１Ｍ（モル／リットル）の割合で溶解された電解液が注
入されている。更に、上記外装缶５の開口部には、ポリ
プロピレン（ＰＰ）から成る絶縁性の外部ガスケット２
５を介して、封口体６がかしめ固定されており、これに
よって電池が封口される。As shown in FIG. 1, a lithium ion battery according to an embodiment of the present invention has a cylindrical outer can 5 having a bottom. In the outer can 5, a core made of aluminum is provided with LiCoO 2. Positive electrode 1 on which active material layer mainly composed of 2 is formed
A spiral power generating element 4 including a negative electrode 2 in which an active material layer mainly composed of graphite is formed on a core made of copper, and a separator 3 that separates the electrodes 1 and 2 are housed. In the outer can 5, a mixed solvent of ethylene carbonate (EC) and dimethyl carbonate (DMC) mixed at a volume ratio of 4: 6 and LiPF 6 at a ratio of 1M (mol / liter) is used. The electrolyte dissolved in is injected. Furthermore, an insulating outer gasket 2 made of polypropylene (PP) is provided in the opening of the outer can 5.
A sealing body 6 is fixed by caulking through 5, thereby closing the battery.
【００１０】ここで、上記封口体６は、図２に示すよう
に、アルミニウム合金から成り且つガス抜き穴２３を有
する封止板９（厚みＬ1 ＝０．４０ｍｍ）を有してい
る。この封止板９におけるかしめ代１４内には、電池外
部方向に出っ張る凹部９ａ（深さ０．１ｍｍ）が形成さ
れており、この凹部９ａ内には上記外部ガスケット２５
が入り込んでいる。Here, as shown in FIG. 2, the sealing body 6 has a sealing plate 9 (thickness L 1 = 0.40 mm) made of an aluminum alloy and having a vent hole 23. A recess 9a (0.1 mm in depth) projecting toward the outside of the battery is formed in the swaging margin 14 of the sealing plate 9, and the external gasket 25 is formed in the recess 9a.
Is penetrating.
【００１１】また、封止板９には、ＰＰから成る絶縁性
の内部ガスケット１５を介して、アルミニウム合金から
成ると共に中央部が略半円球状を成す防爆弁８と、ＰＴ
Ｃ素子１２と、ガス抜き穴２４が設けられた端子キャッ
プ７とがかしめ固定されている。上記防爆弁８は、封口
体内部２０と電池本体部２６（発電要素４が収納されて
いる部位）とを区切るものであり、通常状態では、封止
板９と電気的に接続される一方（図中、実線で示す）、
過充電時等の異常時に電池内部の圧力が所定値（１０〜
２０ｋｇｆ／ｃｍ2 ）以上になった場合には、封止板９
から剥がれて、これにより充電が中止される（図中、二
点鎖線で示す）。An explosion-proof valve 8 made of an aluminum alloy and having a substantially semi-spherical central portion is provided on the sealing plate 9 via an insulating internal gasket 15 made of PP.
The C element 12 and the terminal cap 7 having the gas vent hole 24 are caulked and fixed. The explosion-proof valve 8 separates the inside of the sealing body 20 from the battery main body 26 (the portion where the power generation element 4 is housed), and is electrically connected to the sealing plate 9 in a normal state ( (Indicated by solid lines in the figure),
When an abnormality such as overcharging occurs, the pressure inside the battery is increased to a predetermined value (10 to 10).
20 kgf / cm 2 ) or more.
, Thereby stopping charging (indicated by a two-dot chain line in the figure).
【００１２】尚、前記外装缶５には、負極２と電気的に
接続された負極集電タブ１３が接続される一方、前記封
口体６の封止板９には正極集電タブ１０が接続され、こ
れにより、電池内で生じる化学的エネルギーを電気的エ
ネルギーに変換することができる。更に前記発電要素４
の上下両端部近傍には、電池内でのショートを防止する
ための絶縁板１６・１７が配置されている。A negative current collecting tab 13 electrically connected to the negative electrode 2 is connected to the outer can 5, while a positive current collecting tab 10 is connected to the sealing plate 9 of the sealing body 6. As a result, chemical energy generated in the battery can be converted to electrical energy. Further, the power generation element 4
Insulating plates 16 and 17 for preventing a short circuit in the battery are disposed near both upper and lower ends of the battery.
【００１３】ここで、上記構造の非水電解質電池を、以
下のようにして作製した。先ず、正極活物質としてのＬ
ｉＣｏＯ2 を９０重量％と、導電剤としてのカーボンブ
ラックを５重量％と、結着剤としてのポリフッ化ビニリ
デンを５重量％と、溶剤としてのＮ−メチル−２−ピロ
リドン（ＮＭＰ）溶液とを混合してスラリーを調製した
後、正極集電タブ１０の溶接部位を除き、上記スラリー
を正極集電体としてのアルミニウム箔（厚み：２０μ
ｍ）の両面に塗布した。その後、溶剤を乾燥し、ローラ
ーで所定の厚みにまで圧縮した後、所定の幅及び長さに
なるように切断し、更にアルミニウム製の正極集電タブ
１０（幅：３ｍｍ）を溶接した。Here, the non-aqueous electrolyte battery having the above structure was manufactured as follows. First, L as a positive electrode active material
90% by weight of iCoO 2 , 5% by weight of carbon black as a conductive agent, 5% by weight of polyvinylidene fluoride as a binder, and N-methyl-2-pyrrolidone (NMP) solution as a solvent After mixing to prepare a slurry, the above-mentioned slurry was removed from an aluminum foil (thickness: 20 μm) as a positive electrode current collector except for a welding portion of the positive electrode current collector tab 10.
m). Thereafter, the solvent was dried, compressed to a predetermined thickness by a roller, cut into a predetermined width and length, and then a positive electrode current collector tab 10 (width: 3 mm) made of aluminum was welded.
【００１４】これと並行して、負極活物質としての黒鉛
粉末を９５重量％と、結着剤としてのポリフッ化ビニリ
デンを５重量％と、溶剤としてのＮＭＰ溶液とを混合し
てスラリーを調製した後、負極集電タブ１３の溶接部位
を除き、上記スラリーを負極集電体としての銅箔（厚
み：１６μｍ）の両面に塗布した。その後、溶剤を乾燥
し、ローラーで所定の厚みにまで圧縮した後、所定の幅
及び長さになるように切断し、更にニッケル製の負極集
電タブ１３（幅：３ｍｍ）を溶接した。At the same time, a slurry was prepared by mixing 95% by weight of graphite powder as a negative electrode active material, 5% by weight of polyvinylidene fluoride as a binder, and an NMP solution as a solvent. Thereafter, the slurry was applied to both surfaces of a copper foil (thickness: 16 μm) as a negative electrode current collector, except for a welding portion of the negative electrode current collector tab 13. Thereafter, the solvent was dried, compressed to a predetermined thickness by a roller, cut into a predetermined width and length, and a nickel negative electrode current collecting tab 13 (width: 3 mm) was welded.
【００１５】次に、上記正極１と負極２とをポリエチレ
ン製微多孔膜から成るセパレータ３（厚み：２５μｍ）
を介して巻回して発電要素４を作製した後、この発電要
素４を絶縁板１６と共に外装缶５内に挿入し、更に負極
集電タブ１３を外装缶５の缶底に溶接した。Next, the positive electrode 1 and the negative electrode 2 are separated by a separator 3 (thickness: 25 μm) made of a microporous polyethylene film.
Then, the power generating element 4 was fabricated by inserting the power generating element 4 together with the insulating plate 16 into the outer can 5, and the negative electrode current collecting tab 13 was welded to the bottom of the outer can 5.
【００１６】その後、防爆弁８、ＰＴＣ素子１２、及び
端子キャップ７を、内部ガスケット１５を介して封止板
９にかしめ固定して、封口体内部２０を封止した。しか
る後、正極集電タブ１０を封口板６に溶接すると共に、
ＥＣとＤＭＣとが体積比で４：６の割合で混合された混
合溶媒に、ＬｉＰＦ6 が１Ｍ（モル／リットル）の割合
で溶解された電解液を外装缶５内に注入した後、外部ガ
スケット２５を介して、封口板６を外装缶５の開口端部
にかしめ固定することにより、円筒形の電池を作製し
た。Thereafter, the explosion-proof valve 8, the PTC element 12, and the terminal cap 7 were caulked and fixed to the sealing plate 9 via the internal gasket 15, thereby sealing the inside 20 of the sealing body. Thereafter, the positive electrode current collecting tab 10 is welded to the sealing plate 6 and
An electrolytic solution in which LiPF 6 is dissolved at a ratio of 1 M (mol / liter) is injected into a mixed solvent in which EC and DMC are mixed at a volume ratio of 4: 6 into an outer can 5, and then an external gasket is formed. The cylindrical battery was manufactured by caulking and fixing the sealing plate 6 to the opening end of the outer can 5 through the intermediate battery 25.
【００１７】尚、封止板９の凹部９ａは、上記実施の形
態に示すように電池内部側に形成するような構造に限定
するものではなく、例えば、図３に示すように、電池外
部側に形成するような構造であっても良い。但し、この
場合においても、外部ガスケット２５の付勢力を十分発
揮させるには、凹部９ａをかしめ代１４内に形成するの
が望ましい。The concave portion 9a of the sealing plate 9 is not limited to the structure formed inside the battery as shown in the above-described embodiment. For example, as shown in FIG. The structure may be such that it is formed at However, even in this case, in order to sufficiently exert the urging force of the external gasket 25, it is desirable to form the concave portion 9a in the crimping allowance 14.
【００１８】また、封止板９に形成するのは凹部に限定
するものではなく、例えば、図４に示すように、凸部９
ｂを形成しても良い。但し、この場合においても、外部
ガスケット２５の付勢力を十分発揮させるには、凸部９
ｂをかしめ代１４内に形成するのが望ましい。更に、凹
部９ａ又は凸部９ｂは１つに限定するものではなく、２
つ以上設けても良い。加えて、封止板９の材質としては
上記アルミニウム合金に限定するものではなく、金属ア
ルミニウム、鉄、ステンレス等を用いることも可能であ
る。Further, what is formed on the sealing plate 9 is not limited to the concave portion. For example, as shown in FIG.
b may be formed. However, even in this case, in order to sufficiently exert the urging force of the external gasket 25, the protrusion 9
It is desirable to form b in the crimping allowance 14. Further, the number of the concave portions 9a or the convex portions 9b is not limited to one.
More than one may be provided. In addition, the material of the sealing plate 9 is not limited to the above-described aluminum alloy, and metal aluminum, iron, stainless steel, or the like can be used.
【００１９】また、本発明は上記リチウムイオン電池に
限定するものではなく、電解液の漏れを確実に防止する
必要性のある電池であれば適用しうることは勿論であ
る。但し、本発明を上記リチウムイオン電池に適用する
場合には、正極材料としては上記ＬｉＣｏＯ2 の他、例
えば、ＬｉＮｉＯ2 、ＬｉＭｎ2 Ｏ4 或いはこれらの複
合体等が好適に用いられ、また負極材料としては上記炭
素材料の他、リチウム金属、リチウム合金、或いは金属
酸化物（スズ酸化物等）等が好適に用いられる。更に、
電解液の溶媒としては上記のものに限らず、プロピレン
カーボネート、ビニレンカーボネート、γ−ブチロラク
トンなどの比較的比誘電率が高い溶液と、ジエチルカー
ボネート、メチルエチルカーボネート、テトラヒドロフ
ラン、１，２−ジメトキシエタン、１，３−ジオキソラ
ン、２−メトキシテトラヒドロフラン、ジエチルエーテ
ル等の低粘度低沸点溶媒とを適度な比率で混合した溶媒
を用いることができる。また、電解液の電解質として
は、上記ＬｉＰＦ6 の他、ＬｉＡｓＦ6 、ＬｉＣｌ
Ｏ4 、ＬｉＢＦ4 、ＬｉＣＦ3 ＳＯ3 等を用いることが
できる。Further, the present invention is not limited to the above-mentioned lithium ion battery, and it is needless to say that the present invention can be applied to any battery that needs to reliably prevent leakage of the electrolyte. However, when the present invention is applied to the lithium ion battery, as the positive electrode material, in addition to the above LiCoO 2 , for example, LiNiO 2 , LiMn 2 O 4 or a composite thereof is preferably used. In addition to the above carbon materials, lithium metal, lithium alloys, metal oxides (such as tin oxide), and the like are preferably used. Furthermore,
The solvent of the electrolytic solution is not limited to the above, propylene carbonate, vinylene carbonate, a solution having a relatively high relative dielectric constant such as γ-butyrolactone, diethyl carbonate, methyl ethyl carbonate, tetrahydrofuran, 1,2-dimethoxyethane, A solvent obtained by mixing a low-viscosity, low-boiling solvent such as 1,3-dioxolan, 2-methoxytetrahydrofuran, diethyl ether or the like at an appropriate ratio can be used. As the electrolyte of the electrolytic solution, in addition to the above-mentioned LiPF 6 , LiAsF 6 , LiCl
O 4 , LiBF 4 , LiCF 3 SO 3 and the like can be used.
【００２０】[0020]
【実施例】〔実施例〕実施例としては、上記発明の実施
の形態に示す方法と同様の方法にて作製した電池を用い
た。このようにして作製した電池を、以下、本発明電池
Ａと称する。EXAMPLES [Examples] As examples, batteries manufactured by a method similar to the method described in the embodiment of the present invention were used. The battery fabricated in this manner is hereinafter referred to as Battery A of the invention.
【００２１】〔比較例〕封止板９に凹部９ａを形成しな
い他は、上記実施例と同様にして電池を作製した。この
ようにして作製した電池を、以下、比較電池Ｘと称す
る。Comparative Example A battery was manufactured in the same manner as in the above example, except that the recess 9a was not formed in the sealing plate 9. The battery fabricated in this manner is hereinafter referred to as Comparative Battery X.
【００２２】〔実験１〕上記本発明電池Ａ及び比較電池
Ｘについて、ヒートショック環境試験機にて１００サイ
クル保存した後、かしめ部からの電解液リーク数を調べ
たので、その結果を表１に示す。尚、ヒートショック環
境試験は、１時間毎に１サイクル、高温側７０℃、低温
側−３０℃という条件で、各電池を保存することにより
行った。また、試料数は、各電池５０個とした。[Experiment 1] The battery A of the present invention and the comparative battery X were stored for 100 cycles in a heat shock environment tester, and the number of electrolyte leaks from the caulked portion was examined. The results are shown in Table 1. Show. The heat shock environment test was performed by storing each battery under the conditions of 70 ° C. on the high temperature side and −30 ° C. on the low temperature side for one cycle every hour. The number of samples was 50 for each battery.
【００２３】[0023]
【表１】 [Table 1]
【００２４】上記表１から明らかなように、比較電池Ｘ
ではかしめ部からの電解液リーク数が極めて多いのに対
して、本発明電池Ａではかしめ部からの電解液リークが
全く生じていないことが認められた。 〔実験２〕上記本発明電池Ａ及び比較電池Ｘについて電
池落下試験を行ったので、その結果を表２に示す。尚、
電池落下試験は、１．５ｍの高さより硬質プラスチック
上に各電池を落下させ、かしめ部からの電解液リークが
発生する落下回数を調べるというものであり、また、試
料数は各電池５０個とした。As apparent from Table 1 above, the comparative battery X
Although the number of electrolyte leaks from the swaged portion was extremely large, it was recognized that no electrolyte leak occurred from the swaged portion in Battery A of the present invention. [Experiment 2] The battery A and the comparative battery X were subjected to a battery drop test, and the results are shown in Table 2. still,
In the battery drop test, each battery is dropped on a hard plastic from a height of 1.5 m, and the number of drops at which electrolyte leaks from the caulked portion is examined. The number of samples is 50 for each battery. did.
【００２５】[0025]
【表２】 [Table 2]
【００２６】上記表２から明らかなように、比較電池Ｘ
では平均１３回落下させるとかしめ部からの電解液リー
クが発生するのに対して、本発明電池Ａでは平均３２回
落下させないとかしめ部からの電解液リークが発生しな
いことが認められた。As apparent from Table 2 above, the comparative battery X
In this case, it was confirmed that when the battery A of the present invention was not dropped on average 32 times, the electrolyte leak from the swaged portion did not occur while the battery A of the present invention did not fall on average 32 times when it was dropped 13 times on average.
【００２７】[0027]
【発明の効果】以上説明したように、本発明によれば、
例え電池の保存温度が大きく変化したり、電池が落下し
た場合であっても、封止板と外部ガスケットとの間或い
は外部ガスケットと外装缶との間のシール性能が低下す
るのを抑制することができるので、電解液が電池外に排
出されるのを抑えることができ、この結果、電池外に存
在する保護回路等を破損するのを防止することができる
といった優れた効果を奏する。As described above, according to the present invention,
Even if the storage temperature of the battery changes greatly or the battery falls, it is necessary to suppress the deterioration of the sealing performance between the sealing plate and the external gasket or between the external gasket and the outer can. Therefore, it is possible to prevent the electrolyte from being discharged out of the battery, and as a result, it is possible to prevent the protection circuit and the like existing outside the battery from being damaged.
【図１】本発明の一例に係るリチウムイオン電池の分解
斜視図。FIG. 1 is an exploded perspective view of a lithium ion battery according to an example of the present invention.
【図２】本発明電池に用いる封口体の拡大半断面図。FIG. 2 is an enlarged half sectional view of a sealing body used in the battery of the present invention.
【図３】本発明電池に用いる他の例に係る封口体の拡大
半断面図。FIG. 3 is an enlarged half sectional view of a sealing body according to another example used for the battery of the present invention.
【図４】本発明電池に用いる更に他の例に係る封口体の
拡大半断面図。FIG. 4 is an enlarged half sectional view of a sealing body according to still another example used in the battery of the present invention.
【図５】従来電池に用いる封口体の拡大半断面図。FIG. 5 is an enlarged half sectional view of a sealing body used for a conventional battery.
４：発電要素 ５：外装缶 ６：封口体 ９：封止板 ９ａ：凹部 ９ｂ：凸部 ２５：外部ガスケット 4: power generating element 5: outer can 6: sealing body 9: sealing plate 9a: concave portion 9b: convex portion 25: external gasket
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山下 修一 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 Ｆターム(参考） 5H011 AA13 AA17 CC02 CC06 CC08 DD05 DD06 DD15 FF03 GG02 HH02 KK01 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shuichi Yamashita 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 5H011 AA13 AA17 CC02 CC06 CC08 DD05 DD06 DD15 FF03 GG02 HH02 KK01
Claims (3)
外装缶を有し、この外装缶の開口部には、外部ガスケッ
トを介して、周縁部が略Ｕ字状に折り曲げられた封止板
を備えた封口体がかしめ固定される構造の密閉型電池に
おいて、 上記封止板と上記外部ガスケットとの接触部位における
封止板には、凹部及び／又は凸部が形成されていること
を特徴とする密閉型電池。1. An outer can having a bottomed cylindrical shape in which a power generating element is housed, and an outer peripheral portion of the outer can is bent into a substantially U-shape via an external gasket. In a sealed battery having a structure in which a sealing body provided with a sealing plate is swaged and fixed, a concave portion and / or a convex portion are formed in a sealing plate at a contact portion between the sealing plate and the external gasket. A sealed battery comprising:
に形成されている、請求項１記載の密閉型電池。2. The sealed battery according to claim 1, wherein the concave portion and / or the convex portion are formed in a swaging margin.
ている、請求項１又は２記載の密閉型電池。3. The sealed battery according to claim 1, wherein a plurality of the concave portions and / or the convex portions are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11085732A JP2000277063A (en) | 1999-03-29 | 1999-03-29 | Sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11085732A JP2000277063A (en) | 1999-03-29 | 1999-03-29 | Sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000277063A true JP2000277063A (en) | 2000-10-06 |
Family
ID=13867025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11085732A Pending JP2000277063A (en) | 1999-03-29 | 1999-03-29 | Sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000277063A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7687189B2 (en) | 2004-04-28 | 2010-03-30 | Eveready Battery Company, Inc. | Housing for a sealed electrochemical battery cell |
| US7833647B2 (en) | 2004-04-28 | 2010-11-16 | Eveready Battery Company, Inc. | Closure vent seal and assembly |
| US8147999B2 (en) | 2008-06-11 | 2012-04-03 | Eveready Battery Company, Inc. | Closure assembly with low vapor transmission for electrochemical cell |
| WO2014049645A1 (en) * | 2012-09-26 | 2014-04-03 | 三洋電機株式会社 | Gasket for secondary cell, and secondary cell |
| CN107996005A (en) * | 2015-08-21 | 2018-05-04 | 株式会社Lg化学 | Cap assemblies |
| WO2020137547A1 (en) * | 2018-12-28 | 2020-07-02 | 三洋電機株式会社 | Gasket and cylindrical battery |
| CN117452246A (en) * | 2023-11-23 | 2024-01-26 | 惠州精惠仪器设备有限公司 | Charging and discharging testing device for lithium battery |
-
1999
- 1999-03-29 JP JP11085732A patent/JP2000277063A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7687189B2 (en) | 2004-04-28 | 2010-03-30 | Eveready Battery Company, Inc. | Housing for a sealed electrochemical battery cell |
| US7824790B2 (en) | 2004-04-28 | 2010-11-02 | Eveready Battery Co., Inc. | Housing for a sealed electrochemical battery cell |
| US7833647B2 (en) | 2004-04-28 | 2010-11-16 | Eveready Battery Company, Inc. | Closure vent seal and assembly |
| US7923138B2 (en) | 2004-04-28 | 2011-04-12 | Eveready Battery Company, Inc. | Housing for a sealed electrochemical battery cell |
| US8173284B2 (en) | 2004-04-28 | 2012-05-08 | Eveready Battery Company, Inc. | Housing for a sealed electrochemical cell |
| US8147999B2 (en) | 2008-06-11 | 2012-04-03 | Eveready Battery Company, Inc. | Closure assembly with low vapor transmission for electrochemical cell |
| WO2014049645A1 (en) * | 2012-09-26 | 2014-04-03 | 三洋電機株式会社 | Gasket for secondary cell, and secondary cell |
| JPWO2014049645A1 (en) * | 2012-09-26 | 2016-08-18 | 三洋電機株式会社 | Secondary battery gasket and secondary battery |
| CN107996005A (en) * | 2015-08-21 | 2018-05-04 | 株式会社Lg化学 | Cap assemblies |
| JP2018522388A (en) * | 2015-08-21 | 2018-08-09 | エルジー・ケム・リミテッド | Cap assembly |
| US10388980B2 (en) | 2015-08-21 | 2019-08-20 | Lg Chem, Ltd. | Cap assembly |
| CN107996005B (en) * | 2015-08-21 | 2020-11-13 | 株式会社Lg化学 | Cap assembly |
| WO2020137547A1 (en) * | 2018-12-28 | 2020-07-02 | 三洋電機株式会社 | Gasket and cylindrical battery |
| CN113261137A (en) * | 2018-12-28 | 2021-08-13 | 三洋电机株式会社 | Gasket and cylindrical battery |
| EP3905403A4 (en) * | 2018-12-28 | 2022-03-16 | SANYO Electric Co., Ltd. | Gasket and cylindrical battery |
| JP7422680B2 (en) | 2018-12-28 | 2024-01-26 | パナソニックエナジー株式会社 | Gasket and cylindrical battery |
| CN117452246A (en) * | 2023-11-23 | 2024-01-26 | 惠州精惠仪器设备有限公司 | Charging and discharging testing device for lithium battery |
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