JP3593709B2 - battery - Google Patents
battery Download PDFInfo
- Publication number
- JP3593709B2 JP3593709B2 JP01702894A JP1702894A JP3593709B2 JP 3593709 B2 JP3593709 B2 JP 3593709B2 JP 01702894 A JP01702894 A JP 01702894A JP 1702894 A JP1702894 A JP 1702894A JP 3593709 B2 JP3593709 B2 JP 3593709B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- cut
- valve
- case
- metal plate
- 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 - Lifetime
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Classifications
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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
Description
【０００１】
【産業上の利用分野】
本発明は、電池に関するものである。
【０００２】
【従来の技術とその課題】
電池は、エネルギー密度が高い方が優れている。しかし、エネルギー密度が高いと異常な環境下や誤使用された場合に電池が破裂・爆発しやすく非常に危険である。
【０００３】
従来の電池は、ゴム製の可逆弁やアルミラミネートフィルムを用いた破裂式の安全弁を用いてきた。この場合、安全弁の口径が大きいほど作動圧が低くなり弁作動時の挙動が安全になる。しかし、口径を大きくすると、ゴム弁体やアルミラミネートの樹脂部を通して外部から水分が侵入したり、外部に電解液が逸散しやすくなり安全性の向上と引き換えに電池の長期信頼性が低下するという欠点がある。
【０００４】
そこで、このような欠点を改善するものとして、金属ケースにケースを貫通していない切れ込みを設けて破裂弁とし、内圧上昇時にはケースに裂け目が生じて圧力を開放するようにした電池が考案された。しかし、この電池は、金属の断裂を利用しているので破裂弁の作動圧が高く、かつ作動圧のバラツキも大きいという問題があった。
【０００５】
【課題を解決するための手段】
本発明は、樹脂フィルムを積層して接着した金属板からなる電池ケースを備えた電池において、該電池ケースの内面には樹脂フィルム層を有し、前記金属板に切れ込み部を設け、前記切れ込み部は前記電池ケースの金属板を貫通し、かつ前記樹脂フィルムには前記切れ込みが貫通しないようにしたことを特徴とする電池を用いて前記の課題を解決するものである。
【０００６】
【作用】
本発明の電池は、電池ケースが金属層と樹脂層との二重構造になっている。そして、通常使用時には金属層によって充分な機械的強度を保証し、異常時（電池内圧上昇時）には、金属層に設けた切れ込みにそって樹脂層が断裂して電池に開口部が生じて電池内圧が開放されるようになっている。
【０００７】
この切れ込みは、全ての部分が金属層を貫通するように設けても良いし、切れ込みの一部だけ金属層を貫通するように設けてもよい。しかし、電池の密閉を保つために切れ込みは、樹脂層を貫通してはならない。本発明の電池は、樹脂の断裂を利用して安全弁を作動させるので、従来の金属板の断裂を利用した安全弁に比較して作動圧が低くそのバラツキも少ない。
【０００８】
また、前記樹脂層は、線状に設けた切れ込みの部分のみ外気にさらされているので、従来のゴム弁やアルミラミネートフィルムを用いた破裂弁に比較して水分透過や電解液の逸散の問題が少ない。樹脂層を透湿性の低いポリプロピレンやポリエチレン、ポリエチレンテレフタレートなどによって構成すれば水分透過をより少なくできる。
【０００９】
【実施例】
以下に実施例を示す。
【００１０】
本発明のリチウム二次電池を次のように製作した。
【００１１】
電池ケースを次のように製作した。７０μｍのＰＰフィルム１を内面にラミネート接着し、外面に８ μｍの塗装膜を施した厚さ０．２２ｍｍの鋼板２をプレス成形して角形電池ケース本体３および電池ケース蓋４を製作した。このとき、ケース本体の底面に図１に示すような断面がＶ字形の切れ込み５を設けた。この切れ込みは、金属板を貫通しているが、樹脂層を貫通してはいない。図では、切れ込みの周辺部が盛り上がっているが、この様にすることにより切れ込み先端への応力集中が起こりやすくなり弁作動圧のバラツキがより少なくなる。
【００１２】
なお、電池ケースの製作の順序は、上記の順序以外でも良い。例えば、まず金属板に切れ込みをいれた後に樹脂フィルムを接着し、その後にプレス成形しても良いし、金属板に切れ込みをいれた後にプレス成形して、その後に樹脂フィルムを接着しても良い。
【００１３】
つぎに、正極板と負極板とからなる電池発電要素を前記電池ケースに格納し二重巻締め封口により電池を封口し本発明の角形リチウム二次電池（Ａ）を製作した。
【００１４】
本発明の電池（Ａ）は、上記実施例の角形以外に図２に示すような円筒形でもよい。そして、切れ込みの位置は電池の底面には限られない。また、切れ込みの全てが金属板を貫通していなくてもよく、一部だけが貫通していてもよい。
【００１５】
図３のように水分侵入を抑制するために金属箔６を接着層７を用いて切れ込み部に張り付けてもよい。
【００１６】
つぎに、電池ケースに金属層を貫通していない切れ込みを設けた以外は本発明の電池（Ａ）と同様の、比較の電池（Ｂ）を製作した。
【００１７】
上記の２種類の電池をそれぞれ２０個製作し、過充電して安全弁作動時の内圧を調べた。内圧の測定は、電池ケースに２ｍｍの丸穴を設けて圧力計を接続して行った。その結果、本発明の電池の作動圧が ７±０．５Ｋｇ／ｃｍ２ であるのに対して、比較の電池は１８±５Ｋｇ／ｃｍ２ と弁作動圧が高くバラツキも大きかった。
【００１８】
また、比較のための電池は、弁作動時に大音響がして内容物が飛散するなど危険であったが、本発明の電池は、弁作動時の音が小さく内容物の飛散もなく大変安全であった。比較のための電池の切れ込みをより深くして弁作動圧力を７ 〜１０ Ｋｇ／ｃｍ２ 程度低下させることを試みたが、切れ込み先端部に亀裂が生じて液もれ等がおこり易く、うまくいかなかった。
【００１９】
なお、実施例では電池缶の１箇所に切れ込み部を設けたが、複数箇所に切れ込み部を設けてもよい。また、電池の種類もリチウム二次電池に限られず、ニッケル・カドミウム電池等の他の形式の電池にも適用可能である。
【００２０】
【発明の効果】
上記のように本発明の電池は、従来の電池に比較して安全弁の作動圧を低くできるので弁作動時の挙動がより安全になり安全性が向上した。また、作動圧のバラツキが少なくなるので電池の信頼性が向上した。
【図面の簡単な説明】
【図１】本発明に係る電池ケース本体を示した図。
【図２】本発明の円筒形のリチウム電池を示した図。
【図３】金属箔を張り付けた切れ込みを示した図。
【符号の説明】
１ 樹脂フィルム
２ 金属板
５ 切れ込み[0001]
[Industrial applications]
The present invention relates to a battery.
[0002]
[Prior art and its problems]
Batteries are better when the energy density is higher. However, if the energy density is high, the battery is likely to burst or explode in an abnormal environment or when misused, which is extremely dangerous.
[0003]
Conventional batteries have used a reversible valve made of rubber or a burst-type safety valve using an aluminum laminated film. In this case, the larger the diameter of the safety valve, the lower the operating pressure and the safer the operation when the valve operates. However, when the diameter is increased, moisture invades from the outside through the rubber valve body or the resin portion of the aluminum laminate, or the electrolyte easily escapes to the outside, and the long-term reliability of the battery decreases in exchange for improved safety. There is a disadvantage that.
[0004]
Therefore, in order to improve such a drawback, a battery was devised in which a notch that did not penetrate the case was provided in the metal case to form a rupture valve, and when the internal pressure was increased, a crack was generated in the case to release the pressure. . However, this battery has a problem in that the operating pressure of the rupture valve is high and the operating pressure varies greatly because the rupture of metal is utilized.
[0005]
[Means for Solving the Problems]
The present invention relates to a battery provided with a battery case composed of a metal plate laminated and bonded with a resin film, wherein the battery case has a resin film layer on an inner surface thereof, and the metal plate is provided with a cut portion, penetrates the metal plate of the battery case, and the said resin film is to solve the above problems by using a battery, characterized in that as the cut does not penetrate.
[0006]
[Action]
In the battery of the present invention, the battery case has a double structure of a metal layer and a resin layer. In normal use, the metal layer ensures sufficient mechanical strength, and in the event of an abnormality (when the internal pressure of the battery rises), the resin layer is torn along the notch provided in the metal layer and an opening is formed in the battery. The internal pressure of the battery is released.
[0007]
The cut may be provided so that all the parts penetrate the metal layer, or may be provided so that only a part of the cut penetrates the metal layer. However, the cuts must not penetrate the resin layer to keep the battery sealed. Since the battery of the present invention operates the safety valve by using the rupture of the resin, the operating pressure is lower than that of the conventional safety valve using the rupture of the metal plate, and the variation thereof is small.
[0008]
In addition, since the resin layer is exposed to the outside air only at the cut portions provided in a linear shape, compared with a conventional rubber valve or a rupture valve using an aluminum laminated film, moisture permeation and dissipation of the electrolytic solution are reduced. There are few problems. If the resin layer is made of polypropylene, polyethylene, polyethylene terephthalate, or the like having low moisture permeability, moisture permeation can be further reduced.
[0009]
【Example】
Examples will be described below.
[0010]
The lithium secondary battery of the present invention was manufactured as follows.
[0011]
A battery case was manufactured as follows. A 70 μm PP film 1 was laminated and bonded to the inner surface, and a 0.22 mm
[0012]
The order of manufacturing the battery case may be other than the order described above. For example, a resin film may be adhered after a cut is made in a metal plate, and then press-molded, or a press formed after a cut is made in a metal plate, and then the resin film may be adhered. .
[0013]
Next, a battery power generating element composed of a positive electrode plate and a negative electrode plate was stored in the battery case, and the battery was sealed with a double-winding seal to produce a prismatic lithium secondary battery (A) of the present invention.
[0014]
The battery (A) of the present invention may have a cylindrical shape as shown in FIG. The position of the cut is not limited to the bottom surface of the battery. Further, not all of the cuts need not penetrate the metal plate, and only a part thereof may penetrate.
[0015]
As shown in FIG. 3, a metal foil 6 may be adhered to the cut portion using an
[0016]
Next, a comparative battery (B) was produced in the same manner as the battery (A) of the present invention, except that a notch not penetrating the metal layer was provided in the battery case.
[0017]
Twenty of each of the above two types of batteries were manufactured, overcharged, and the internal pressure during the operation of the safety valve was examined. The internal pressure was measured by providing a 2 mm round hole in the battery case and connecting a pressure gauge. As a result, while the operating pressure of the battery of the present invention is 7 ± 0.5Kg / cm 2, the battery of comparison 18 ± 5Kg / cm 2 and the valve operating pressure is high variation was also large.
[0018]
In addition, the battery for comparison was dangerous, such as loud noise when the valve was operated and the contents were scattered. Met. An attempt was made to lower the valve operating pressure by about 7 to 10 Kg / cm 2 by making the cut of the battery deeper for comparison, but cracks were generated at the cut end, and liquid leakage and the like were likely to occur. Did not.
[0019]
In the embodiment, the cut portion is provided at one place of the battery can, but the cut portion may be provided at a plurality of places. Further, the type of the battery is not limited to the lithium secondary battery, and can be applied to other types of batteries such as a nickel-cadmium battery.
[0020]
【The invention's effect】
As described above, in the battery of the present invention, the operating pressure of the safety valve can be reduced as compared with the conventional battery, so that the behavior at the time of operating the valve is safer and the safety is improved. In addition, since the variation in the operating pressure is reduced, the reliability of the battery is improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a battery case main body according to the present invention.
FIG. 2 is a diagram showing a cylindrical lithium battery of the present invention.
FIG. 3 is a view showing a cut with a metal foil attached.
[Explanation of symbols]
1
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01702894A JP3593709B2 (en) | 1994-01-17 | 1994-01-17 | battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01702894A JP3593709B2 (en) | 1994-01-17 | 1994-01-17 | battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07211300A JPH07211300A (en) | 1995-08-11 |
| JP3593709B2 true JP3593709B2 (en) | 2004-11-24 |
Family
ID=11932548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01702894A Expired - Lifetime JP3593709B2 (en) | 1994-01-17 | 1994-01-17 | battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3593709B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180115642A (en) * | 2017-04-13 | 2018-10-23 | 주식회사 엘지화학 | Secondary battery |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW367631B (en) | 1997-04-21 | 1999-08-21 | Toyo Kohan Co Ltd | Closed battery |
| US6737187B2 (en) | 1997-04-21 | 2004-05-18 | Toyo Kohan Co., Ltd. | Closed battery |
| KR100573093B1 (en) * | 1998-10-14 | 2006-08-30 | 삼성에스디아이 주식회사 | Pouch Type Lithium Ion Secondary Battery |
| KR200244258Y1 (en) * | 2000-09-29 | 2001-09-26 | 주식회사 엘지씨아이 | Safety groove on charging and discharging battery |
| JP2003142043A (en) * | 2001-07-09 | 2003-05-16 | Hitachi Maxell Ltd | Battery |
| KR20020042598A (en) * | 2002-05-16 | 2002-06-05 | 이점호 | safety-groove of a secondary battery |
| JP4631245B2 (en) * | 2002-11-13 | 2011-02-16 | パナソニック株式会社 | Square battery |
| US7435395B2 (en) | 2003-01-03 | 2008-10-14 | The Gillette Company | Alkaline cell with flat housing and nickel oxyhydroxide cathode |
| US7491464B2 (en) | 2003-01-03 | 2009-02-17 | The Gillette Company | Alkaline cell with flat housing |
| US6833215B2 (en) | 2003-01-03 | 2004-12-21 | The Gillette Company | Alkaline cell with flat housing |
| US7294429B2 (en) | 2003-01-03 | 2007-11-13 | The Gillette Company | Alkaline cell with flat housing |
| KR100795069B1 (en) * | 2004-10-20 | 2008-01-17 | 주식회사 엘지화학 | Secondary battery with safety device that prevents crack from spreading |
| CN2757343Y (en) * | 2004-11-16 | 2006-02-08 | 比亚迪股份有限公司 | Anti-explosion safety cell |
| KR100788574B1 (en) * | 2005-11-29 | 2007-12-26 | 삼성에스디아이 주식회사 | Secondary battery |
| JP2008153111A (en) * | 2006-12-19 | 2008-07-03 | Hissho Go | Safety structure of resin battery can |
| US9240578B2 (en) * | 2010-03-09 | 2016-01-19 | Samsung Sdi Co., Ltd. | Secondary battery |
| KR20180092444A (en) * | 2017-02-09 | 2018-08-20 | 주식회사 엘지화학 | A cylindrical type Li-ion secondary battery |
-
1994
- 1994-01-17 JP JP01702894A patent/JP3593709B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180115642A (en) * | 2017-04-13 | 2018-10-23 | 주식회사 엘지화학 | Secondary battery |
| JP2019530962A (en) * | 2017-04-13 | 2019-10-24 | エルジー・ケム・リミテッド | Secondary battery |
| EP3506392A4 (en) * | 2017-04-13 | 2019-10-30 | LG Chem, Ltd. | Secondary battery |
| KR102183539B1 (en) | 2017-04-13 | 2020-11-26 | 주식회사 엘지화학 | Secondary battery |
| US10971781B2 (en) | 2017-04-13 | 2021-04-06 | Lg Chem, Ltd. | Secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07211300A (en) | 1995-08-11 |
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