JP4366738B2 - Lithium secondary battery - Google Patents
Lithium secondary battery Download PDFInfo
- Publication number
- JP4366738B2 JP4366738B2 JP35895798A JP35895798A JP4366738B2 JP 4366738 B2 JP4366738 B2 JP 4366738B2 JP 35895798 A JP35895798 A JP 35895798A JP 35895798 A JP35895798 A JP 35895798A JP 4366738 B2 JP4366738 B2 JP 4366738B2
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- JP
- Japan
- Prior art keywords
- battery
- electrode group
- sealing plate
- lithium secondary
- battery case
- 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.)
- Expired - Fee Related
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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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- Sealing Battery Cases Or Jackets (AREA)
- Cell Separators (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、電池の電極群と封口板との間に配した絶縁リングに関するものである。
【０００２】
【従来の技術】
近年、各種ポ−タブル機器の普及に伴い、密閉型蓄電池が広く用いられておりニッケルカドミウム電池、ニッケル水素電池、リチウム二次電池がその代表である。これらの電池の多くは正・負極板をセパレ−タを介して渦巻状に巻回した電極群を電池ケ−スに収納し、その正極側リ−ドをケ−ス開口部を封口する封口板に溶接する方法が一般的であり、負極はそれ自体を電池ケ−ス内壁と接触させるか、リ−ド先端をケ−ス内底部に溶接している。
【０００３】
【発明が解決しようとする課題】
これらポ−タブル機器に用いられる電池は、市場で落下衝撃や、繰り返し振動が加えられる苛酷な条件で使用される場合がある。電池は、その内部で極板群が移動、振動を繰り返し、極板群上部より突出した正極リ−ド部の変形が起こり、ケ−ス溝部又は、電極群上部の負極板端と接触し、いわゆる電池の内部短絡を起こして電池の電圧が低下するという課題があった。
【０００４】
本発明は、上記の問題点を解決するものであり、耐衝撃性に優れたリチウム二次電池を提供することを目的としている。
【０００５】
【課題を解決するための手段】
この課題を解決するために本発明は、正・負極板とセパレ−タを渦巻状に巻回した電極群を収納した電池ケースと、前記電池ケースの上部にガスケットを介してかしめ加工した封口板と、前記電極群と前記封口板との間に絶縁リングを備えたリチウム二次電池であって、前記絶縁リングは、中央に孔部を設けた円盤状の鍔部と、前記鍔部の内周縁部より上方に向かって形成された筒状の支柱部と、前記支柱部の中を跨る平板部とを有し、前記鍔部の外周縁部は前記電池ケースに設けた溝部の直下に配置され、前記支柱部の上部は前記封口板の底面と接し、前記鍔部の下部は前記電極群の上部と密着した形で電極群を加圧固定した状態で保持されることを特徴とする。これにより、電極群を確実に固定することにより、衝撃、振動による正極リ−ド部の変形を抑え、ケ−ス溝部又は、電極群上部負極端との接触を防止するもので、電池の耐衝撃性を高めるものである。
【０００６】
【発明の実施の形態】
本発明の実施の形態について、図面に基づき説明する。図１は本発明の絶縁リングを配置した電池の断面略図である。図１において、１が金属性の電池ケ−スである。２はケ−ス１の上部に電気絶縁性と気密性とを持ったガスケット３を介してかしめ固定される金属性の封口板である。なお４は正・負極板及びセパレ−タからなる渦巻状電極群である。５が４に示す電極群と封口板の間にに収納された正極リ−ドである。本発明の特徴である絶縁リングは６である。これは、図に示すよう上部は封口板に下部は周縁部に設けられた鍔部６ａで電極群に密着した形で極板群を加圧固定しケ−ス内での電極群の移動を抑制している。
【０００７】
また図２は、絶縁リングの実施形態の例で（Ａ）の形状の他に、電極群の中央部により近い部分を固定できる形状（Ｂ）や、正極リ−ドと極板群との接触を防止する形状（Ｃ）を採用するとさらに耐衝撃性の効果は高くなる。
【０００８】
次に、本発明の具体例を説明する。図２（Ａ）に示した絶縁リングを使用した電池を本発明電池Ａ、図２（Ｃ）に示した絶縁リングを使用した電池を本発明電池Ｃ、図３に示した絶縁リングを使用した電池を比較電池Ｄとし、１．５ｍの高さよりコンクリ−ト上に落下させて電池電圧の異常の発生率を調べた。
【０００９】
【表１】
（表１）より明らかなように本発明の電池は耐衝撃性の点で優れた効果が得られることがわかる。
【００１１】
以上の効果は、円筒形電池ばかりではなく、角形電池においても同様な効果が得られる。
【００１２】
【発明の効果】
以上のように本発明は、電極群と封口板の間に加圧状態で配した絶縁リングを用いることにより、落下衝撃、振動による電極群の移動を抑制し、正極リ−ドと電池ケ−ス又は負極板との接触を防止するという耐衝撃性に優れた電池を提供できるものである。
【図面の簡単な説明】
【図１】本発明の絶縁リングが配置された電池を示す断面図
【図２】（Ａ）本発明の絶縁リングの１例を示す斜視図
（Ｂ）本発明の絶縁リングの１例を示す斜視図
（Ｃ）本発明の絶縁リングの１例を示す斜視図
【図３】従来の電池の絶縁リングを示す斜視図
【符号の説明】
１ 電池ケ−ス
２ 封口板
３ ガスケット
４ 電極群
５ 正極リ−ド
６ 絶縁リング
６ａ 鍔部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulating ring disposed between a battery electrode group and a sealing plate.
[0002]
[Prior art]
In recent years, with the spread of various portable devices, sealed storage batteries are widely used, and nickel cadmium batteries, nickel metal hydride batteries, and lithium secondary batteries are representative. In many of these batteries, a positive electrode and a negative electrode plate wound in a spiral shape via a separator are housed in a battery case, and the positive electrode side lead is sealed to seal the case opening. In general, the negative electrode is brought into contact with the inner wall of the battery case or the leading end of the lead is welded to the inner bottom of the case.
[0003]
[Problems to be solved by the invention]
Batteries used in these portable devices may be used under severe conditions where a drop impact or repeated vibration is applied in the market. In the battery, the electrode plate group repeatedly moves and vibrates in the battery, and the positive lead portion protruding from the upper portion of the electrode plate group is deformed, contacting the case groove portion or the negative electrode plate end of the upper electrode group, There has been a problem that the voltage of the battery is lowered due to a so-called internal short circuit of the battery.
[0004]
The present invention solves the above-described problems, and an object of the present invention is to provide a lithium secondary battery excellent in impact resistance.
[0005]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a battery case that houses a group of electrodes in which positive and negative electrode plates and a separator are wound in a spiral shape, and a sealing plate that is caulked to the upper portion of the battery case via a gasket. A lithium secondary battery including an insulating ring between the electrode group and the sealing plate, the insulating ring including a disc-shaped flange having a hole in the center, and an inner portion of the flange It has a cylindrical column portion formed upward from the peripheral portion and a flat plate portion straddling the column portion, and the outer peripheral edge portion of the flange portion is arranged immediately below the groove portion provided in the battery case. The upper portion of the support portion is in contact with the bottom surface of the sealing plate, and the lower portion of the flange portion is held in a state where the electrode group is pressed and fixed in close contact with the upper portion of the electrode group. As a result, the electrode group is securely fixed, so that deformation of the positive electrode lead portion due to impact and vibration is suppressed, and contact with the case groove portion or the upper negative electrode end of the electrode group is prevented. Improves impact.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view of a battery in which an insulating ring according to the present invention is arranged. In FIG. 1, 1 is a metallic battery case. A
[0007]
FIG. 2 is an example of the embodiment of the insulating ring, in addition to the shape of (A), the shape (B) that can fix a portion closer to the center of the electrode group, and the contact between the positive electrode lead and the electrode plate group When the shape (C) for preventing the above is adopted, the effect of impact resistance is further enhanced.
[0008]
Next, specific examples of the present invention will be described. The battery using the insulating ring shown in FIG. 2 (A) is the present invention battery A, the battery using the insulating ring shown in FIG. 2 (C) is the present invention battery C, and the insulating ring shown in FIG. 3 is used. The battery was designated as comparative battery D, dropped on a concrete from a height of 1.5 m, and the occurrence rate of battery voltage abnormality was examined.
[0009]
[Table 1]
As is clear from Table 1, it can be seen that the battery of the present invention has an excellent effect in terms of impact resistance.
[0011]
The above effect can be obtained not only in a cylindrical battery but also in a square battery.
[0012]
【The invention's effect】
As described above, the present invention suppresses the movement of the electrode group due to drop impact and vibration by using the insulating ring arranged in a pressurized state between the electrode group and the sealing plate, and the positive electrode lead and the battery case or It is possible to provide a battery excellent in impact resistance that prevents contact with the negative electrode plate.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a battery in which an insulating ring of the present invention is arranged. FIG. 2A is a perspective view showing an example of the insulating ring of the present invention. FIG. 1B shows an example of the insulating ring of the present invention. Perspective view (C) Perspective view showing one example of the insulating ring of the present invention [FIG. 3] Perspective view showing a conventional battery insulating ring [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1
Claims (1)
前記絶縁リングは、中央に孔部を設けた円盤状の鍔部と、前記鍔部の内周縁部より上方に向かって形成された筒状の支柱部と、前記支柱部の中を跨る平板部とを有し、
前記鍔部の外周縁部は前記電池ケースに設けた溝部の直下に配置され、
前記支柱部の上部は前記封口板の底面と接し、前記鍔部の下部は前記電極群の上部と密着した形で電極群を加圧固定したリチウム二次電池。 A battery case containing an electrode group in which a positive / negative electrode plate and a separator are wound in a spiral shape, a sealing plate caulked on the upper part of the battery case via a gasket, and the electrode group and the sealing plate a lithium secondary battery including the insulation ring between,
The insulating ring includes a disc-shaped flange portion provided with a hole in the center, a cylindrical support portion formed upward from an inner peripheral edge portion of the flange portion, and a flat plate portion straddling the support portion. And
The outer peripheral edge of the collar is disposed directly below the groove provided in the battery case,
The lithium secondary battery in which the upper portion of the support portion is in contact with the bottom surface of the sealing plate, and the lower portion of the flange portion is in pressure contact with the upper portion of the electrode group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35895798A JP4366738B2 (en) | 1998-12-17 | 1998-12-17 | Lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35895798A JP4366738B2 (en) | 1998-12-17 | 1998-12-17 | Lithium secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000182592A JP2000182592A (en) | 2000-06-30 |
| JP4366738B2 true JP4366738B2 (en) | 2009-11-18 |
Family
ID=18461994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35895798A Expired - Fee Related JP4366738B2 (en) | 1998-12-17 | 1998-12-17 | Lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4366738B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4961113B2 (en) | 2005-04-22 | 2012-06-27 | パナソニック株式会社 | Secondary battery |
| KR100696786B1 (en) * | 2005-04-27 | 2007-03-19 | 삼성에스디아이 주식회사 | cylinder type rechargeable battery |
| KR100839782B1 (en) | 2006-11-30 | 2008-06-19 | 삼성에스디아이 주식회사 | Secondary battery |
| KR102007702B1 (en) | 2013-01-03 | 2019-10-21 | 삼성에스디아이 주식회사 | Rechargeable battery |
| US10431853B2 (en) | 2017-05-02 | 2019-10-01 | Apple Inc. | Rechargeable battery features and components |
-
1998
- 1998-12-17 JP JP35895798A patent/JP4366738B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000182592A (en) | 2000-06-30 |
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