JPH10302840A - Non-aqueous electrolyte secondary battery - Google Patents
Non-aqueous electrolyte secondary batteryInfo
- Publication number
- JPH10302840A JPH10302840A JP9110750A JP11075097A JPH10302840A JP H10302840 A JPH10302840 A JP H10302840A JP 9110750 A JP9110750 A JP 9110750A JP 11075097 A JP11075097 A JP 11075097A JP H10302840 A JPH10302840 A JP H10302840A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- collector terminal
- battery
- plate
- negative electrode
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、密閉型電池、殊に
リチウム二次電池等の高エネルギ−密度を有する電池の
安全性、生産性の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of safety and productivity of sealed batteries, especially batteries having high energy density such as lithium secondary batteries.
【０００２】[0002]
【従来の技術】近年、電子機器のポータブル化、コード
レス化が急速に進んでおり、これらの駆動用電源として
小形・軽量で、高エネルギー密度を有する二次電池への
要望が高い。このような点で非水系二次電池、特にリチ
ウム二次電池はとりわけ高電圧・高エネルギー密度を有
する密閉型電池として期待が大きい。しかし、密閉型電
池は、誤使用や落下時に正極集電端子と電池内部の負極
との短絡を防止するために正極端子に絶縁テープを貼り
付けたり、極板群の封口板側の面を覆うような絶縁リン
グを挿入していた。2. Description of the Related Art In recent years, portable electronic devices and cordless electronic devices have been rapidly developed, and there is a great demand for small and lightweight secondary batteries having high energy density as power sources for driving these electronic devices. From this point of view, non-aqueous secondary batteries, particularly lithium secondary batteries, are particularly expected as sealed batteries having high voltage and high energy density. However, in the sealed battery, in order to prevent short circuit between the positive electrode current collector terminal and the negative electrode inside the battery when it is misused or dropped, an insulating tape is attached to the positive electrode terminal or the surface of the electrode plate group on the sealing plate side is covered. Such an insulating ring had been inserted.
【０００３】[0003]
【発明が解決しようとする課題】前述のように、正極集
電端子に絶縁テープを貼りつければ、正極集電端子と電
離内部の負極との短絡は防止できるが、製造工程で精度
良くテープを貼り付けることが困難であり、もし貼り付
け位置がずれた場合は絶縁の効果が失われる。また、極
板群の封口板側の面を覆うような絶縁リングを挿入する
場合も絶縁リングを精度良く所定の位置に挿入すること
が困難であり、挿入位置がずれた場合、電池の封口部よ
りの漏液や、正極集電端子を曲げてしまうために製造上
の不良品が多くなってしまう。As described above, if an insulating tape is attached to the positive electrode current collecting terminal, a short circuit between the positive electrode current collecting terminal and the negative electrode inside the ionization can be prevented. It is difficult to attach, and if the attaching position is shifted, the insulating effect is lost. Also, when inserting an insulating ring that covers the surface of the electrode plate group on the sealing plate side, it is difficult to accurately insert the insulating ring into a predetermined position. More liquid leakage and bending of the positive electrode current collector terminal increase the number of defective products in manufacturing.
【０００４】本発明はこのような課題を解決するもので
あり、製造工程を安定化し、かつ正極集電端子と電池内
部の負極との短絡を防止できる非水電解液二次電池を得
るものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a non-aqueous electrolyte secondary battery capable of stabilizing a manufacturing process and preventing a short circuit between a positive electrode current collecting terminal and a negative electrode inside the battery. is there.
【０００５】[0005]
【課題を解決するための手段】上述のように、正極集電
端子に絶縁テープを貼り付けたり、極板群の封口板側を
覆うような絶縁リングを挿入すれば、正極集電端子と電
池内部の負極との短絡が防止できるが、製造工程が複雑
になり、テープの貼り付け位置やリングの挿入位置がず
れた場合に正極集電端子と電池内部の負極との短絡をお
こしたり、封口部よりの漏液が発生する場合があるの
で、絶縁テープや絶縁リングに代わり、あらかじめ正極
集電端子にポリエチレン（以下ＰＥと記す）、ポリプロ
ピレン（以下ＰＰと記す）、ポリエーテルゴム、ポリ塩
化ビニリデン、ブタジエンスチレンラバー（以下ＳＢＲ
と記す）、シリコンゴムからなる絶縁体を１０〜５０μ
ｍの厚みで塗布するものである。As described above, if an insulating tape is attached to the positive electrode current collector terminal or an insulating ring covering the sealing plate side of the electrode plate group is inserted, the positive electrode current collector terminal and the battery can be obtained. Although a short circuit with the internal negative electrode can be prevented, the manufacturing process becomes complicated, and if the tape attachment position or ring insertion position shifts, a short circuit may occur between the positive current collector terminal and the negative electrode inside the battery, or the battery may be closed. In some cases, liquid leakage from the part may occur, so instead of insulating tapes and insulating rings, use polyethylene (hereinafter, referred to as PE), polypropylene (hereinafter, referred to as PP), polyether rubber, polyvinylidene chloride, etc. , Butadiene styrene rubber (hereinafter SBR)
, 10 to 50 μm of insulating material made of silicone rubber.
It is applied in a thickness of m.
【０００６】このようにあらかじめ正極集電端子に絶縁
樹脂を塗布することにより、正極集電端子と電池内部の
負極との短絡を防止し、また、正極集電端子へのテープ
貼り付けや、極板群の封口板側の面を覆うような絶縁リ
ングを挿入することによる製造工程上のトラブルを防止
することができる。As described above, by applying an insulating resin to the positive electrode current collecting terminal in advance, a short circuit between the positive electrode current collecting terminal and the negative electrode inside the battery can be prevented. Trouble in the manufacturing process due to the insertion of the insulating ring covering the surface of the plate group on the side of the sealing plate can be prevented.
【０００７】[0007]
【発明の実施の形態】以下、図面と共に本発明の実施の
形態を説明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００８】（実施例１）図１は本発明の密閉型電池の
要部側断面を示す図である。(Embodiment 1) FIG. 1 is a sectional view showing a main part of a sealed battery according to the present invention.
【０００９】ここで本実施例で用いた電池では、リチウ
ム複合酸化物粉末（コバルト酸リチウム）導電材、結着
剤をペ−スト化してアルミニウム箔等の基材に塗着した
正極板と、黒鉛粉末、結着剤等のペ−ストを銅箔等の基
材に塗着した負極板を微多孔性ポリエチレン膜等のセパ
レ−タを介して巻回した極板群３を、負極端子を兼ねた
金属製の電池ケ−ス１内に装填している。また、上部絶
縁板６を極板群３の上部に配置し、正極集電端子４（ア
ルミニウム製）の先端を、上部絶縁板６の穴部を通して
上方へ導出し、封口板２の皿状蓋板（アルミニウム製）
の底面にスポット溶接あるいはレ−ザ−溶接等で溶接固
定する。また、正極集電端子の極板群に対向する面に絶
縁樹脂であるポリエチレン樹脂（ＰＥ）を塗布してい
る。Here, in the battery used in this embodiment, a positive electrode plate in which a lithium composite oxide powder (lithium cobaltate) conductive material and a binder were made into paste and applied to a base material such as aluminum foil, A negative electrode plate obtained by applying a paste such as graphite powder and a binder to a base material such as a copper foil and winding the same through a separator such as a microporous polyethylene film is used as an electrode plate group 3. It is loaded in a metal battery case 1 that also serves as a metal. Further, the upper insulating plate 6 is arranged on the upper part of the electrode plate group 3, and the tip of the positive electrode current collector terminal 4 (made of aluminum) is led out upward through the hole of the upper insulating plate 6 to form the dish-like lid of the sealing plate 2. Plate (made of aluminum)
Welded and fixed to the bottom surface by spot welding or laser welding. Further, a polyethylene resin (PE), which is an insulating resin, is applied to a surface of the positive electrode current collecting terminal facing the electrode plate group.
【００１０】これを本発明の電池Ａとする。This is designated as Battery A of the present invention.
【００１１】また、正極集電端子にポリプロピレン製絶
縁テープを貼り付けたもの、正極集電端子に何の加工も
施さないもの、正極集電端子に何の加工も施さず上記上
部絶縁板を極板群の封口板側の面を覆うような絶縁板に
したものをそれぞれ比較電池Ａ、比較電池Ｂ、比較電池
Ｃとする。さらにポリプロピレン樹脂（ＰＰ）を塗布し
たもの、ポリエーテルゴムを塗布したもの、ポリ塩化ビ
ニリデンを塗布したもの、ＳＢＲを塗布したもの、シリ
コンゴムを塗布したものをそれぞれ本発明の電池Ｂ、
Ｃ、Ｄ、Ｅ、Ｆとする。これらの電池作製の際の製造工
程不良率を比較したものを図２に、各電池の落下試験時
の電池開路電圧の挙動を比較したものを図３に示す。Also, a positive electrode current collector terminal with a polypropylene insulating tape affixed thereto, a positive electrode current collector terminal without any processing, a positive electrode current collector terminal without any processing, and Insulating plates that cover the surface of the plate group on the sealing plate side are referred to as comparative battery A, comparative battery B, and comparative battery C, respectively. Further, the one coated with polypropylene resin (PP), the one coated with polyether rubber, the one coated with polyvinylidene chloride, the one coated with SBR, and the one coated with silicone rubber are the batteries B of the present invention, respectively.
C, D, E, and F. FIG. 2 shows a comparison of the manufacturing process failure rates in the production of these batteries, and FIG. 3 shows a comparison of the behavior of the battery open-circuit voltage at the time of the drop test of each battery.
【００１２】[0012]
【表１】 [Table 1]
【００１３】この結果より比較電池Ａ、Ｃは落下試験時
の開路電圧異常は本発明の電池Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆ
と同じく発生していないが、工程不良率が本発明の電池
Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆよりも約５％高い。また、比較
電池Ｂは工程不良率は本発明の電池Ａ、Ｂ、Ｃ、Ｄ、
Ｅ、Ｆと同等であるが、落下試験時の開路電圧異常品の
発生率が高い。この原因をしらべたところ比較電池Ａは
絶縁テープ貼り付け工程での不良率が高く、比較電池Ｃ
は上部絶縁板挿入工程での不良率が高くなっていた。ま
た、比較電池Ｂを分解、調査したところ、開路電圧異常
の原因は正極集電端子と極板群の負極板との短絡による
ものとわかった。From these results, the batteries A, B, C, D, E, and F of the present invention showed that the open-circuit voltage abnormalities at the time of the drop test were comparative batteries A and B.
Similarly, the process defect rate is about 5% higher than the batteries A, B, C, D, E and F of the present invention. In the comparative battery B, the process failure rate was determined by the batteries A, B, C, D, and
It is equivalent to E and F, but the occurrence rate of abnormal open circuit voltage during drop test is high. As a result of examining the cause, the comparative battery A had a high defect rate in the insulating tape attaching step, and the comparative battery C
Had a high defect rate in the step of inserting the upper insulating plate. Further, when the comparative battery B was disassembled and investigated, it was found that the cause of the open circuit voltage abnormality was a short circuit between the positive electrode current collecting terminal and the negative electrode plate of the electrode plate group.
【００１４】このようにあらかじめ正極集電端子にＰ
Ｅ、ＰＰ、ポリエーテルゴム、ポリ塩化ビニリデン、Ｓ
ＢＲ、シリコンゴムを塗布することで正極集電端子に絶
縁テープを貼り付けたり、極板群の封口板側を覆うよう
な絶縁板を挿入するよりも製造工程を安定化し、かつ同
等の正極集電端子と電池内部との短絡防止効果を得られ
た。ただし、図２、図３に示すように塗布絶縁樹脂の塗
布厚みが５０μｍ以上では正極集電端子への封口板溶接
時に溶接不良が多くなり、１０μｍ以下では内部短絡防
止効果が低下するため塗布絶縁樹脂の塗布厚みは１０〜
５０μｍの範囲で塗布することが必要である。[0014] As described above, P
E, PP, polyether rubber, polyvinylidene chloride, S
Applying BR or silicone rubber stabilizes the manufacturing process more than attaching an insulating tape to the positive electrode current collector terminal or inserting an insulating plate that covers the sealing plate side of the electrode group, and provides an equivalent positive electrode collector. The effect of preventing a short circuit between the terminal and the inside of the battery was obtained. However, as shown in FIGS. 2 and 3, when the coating thickness of the coating insulating resin is 50 μm or more, welding failure is increased at the time of welding the sealing plate to the positive electrode current collector terminal, and when the coating thickness is 10 μm or less, the effect of preventing internal short circuit is reduced. Resin coating thickness is 10
It is necessary to apply in the range of 50 μm.
【００１５】また、正極集電端子を封口板に溶接後Ｐ
Ｅ、ＰＰ、ポリエーテルゴム、ポリ塩化ビニリデン、Ｓ
ＢＲ、シリコンゴムを塗布することでも短絡防止効果は
同様な結果となることを確認した。After welding the positive electrode current collector terminal to the sealing plate, P
E, PP, polyether rubber, polyvinylidene chloride, S
It was confirmed that the short-circuit prevention effect has the same result by applying BR or silicon rubber.
【００１６】さらに、絶縁樹脂を正極集電端子の極板群
に対向する面に塗布したが、これ以外に両面であっても
良い。Further, the insulating resin is applied to the surface of the positive electrode current collector terminal facing the electrode plate group, but it may be applied to both surfaces.
【００１７】[0017]
【発明の効果】以上のように本発明は正極集電端子の両
面あるいは極板群にポリエチレン、ポリプロピレン、ポ
リエーテルゴム、ポリ塩化ビニリデン、ＳＢＲ、シリコ
ンゴムから選ばれる絶縁樹脂をあらかじめ塗布すること
によって製造工程を安定化し、かつ充分な正極集電端子
と電池内部との短絡防止効果を持つ非水電解液二次電池
を実現することができる。As described above, according to the present invention, an insulating resin selected from polyethylene, polypropylene, polyether rubber, polyvinylidene chloride, SBR and silicon rubber is applied in advance to both surfaces of the positive electrode current collecting terminal or the electrode plate group. It is possible to realize a non-aqueous electrolyte secondary battery that stabilizes the manufacturing process and has a sufficient effect of preventing a short circuit between the positive electrode current collecting terminal and the inside of the battery.
【図１】本発明の非水電解液二次電池の縦断面図FIG. 1 is a longitudinal sectional view of a non-aqueous electrolyte secondary battery of the present invention.
【図２】電池製造工程時の工程不良率を示した図FIG. 2 is a diagram showing a process defect rate in a battery manufacturing process.
【図３】電池の落下試験時の開路電圧異常率を示した図FIG. 3 is a diagram showing an open circuit voltage abnormality rate during a battery drop test.
１ 電池ケース ２ 封口板 ３ 極板群 ４ 正極集電端子 ５ 負極集電端子 ６ 上部絶縁板 ７ 底部絶縁板 DESCRIPTION OF SYMBOLS 1 Battery case 2 Sealing plate 3 Electrode group 4 Positive current collecting terminal 5 Negative current collecting terminal 6 Top insulating plate 7 Bottom insulating plate
フロントページの続き (72)発明者 湯川 徹 大阪府門真市大字門真1006番地 松下電器 産業株式会社内Continuation of front page (72) Inventor Toru Yukawa 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (2)
極板群と、電解液を収容した電池ケ−スを密閉する封口
板から構成され、正極板よりの集電端子を上記封口板の
底面に接続することで封口板が正極、負極板よりの集電
端子が電池ケースに接続されることで電池ケースが負極
となるような構造をもち、あらかじめ正極集電端子の両
面、あるいは極板群に対向する面に絶縁樹脂を塗布する
ことにより、正極集電端子と極板群の負極板上部との短
絡を防止するように構成した非水電解液二次電池。An electrode group comprising a positive electrode plate, a negative electrode plate and a separator, and a sealing plate for sealing a battery case containing an electrolyte, wherein a current collecting terminal from the positive electrode plate is connected to the sealing plate. It has a structure in which the sealing plate is connected to the bottom surface of the positive electrode, and the current collecting terminal from the negative electrode plate is connected to the battery case so that the battery case becomes the negative electrode. A non-aqueous electrolyte secondary battery configured to prevent a short circuit between the positive electrode current collector terminal and the upper part of the negative electrode plate of the electrode plate group by applying an insulating resin to the surface facing the plate group.
ピレン、ポリエーテルゴム、ポリ塩化ビニリデン、ブタ
ジエンスチレンラバー、シリコンゴムから選ばれる絶縁
樹脂を塗布して正極集電端子と電池内部の負極との短絡
を防止する請求項１記載の非水電解液二次電池。2. The positive electrode current collector terminal is coated with an insulating resin selected from polyethylene, polypropylene, polyether rubber, polyvinylidene chloride, butadiene styrene rubber, and silicon rubber to short-circuit the positive electrode current collector terminal and the negative electrode inside the battery. The non-aqueous electrolyte secondary battery according to claim 1, which is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9110750A JPH10302840A (en) | 1997-04-28 | 1997-04-28 | Non-aqueous electrolyte secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9110750A JPH10302840A (en) | 1997-04-28 | 1997-04-28 | Non-aqueous electrolyte secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10302840A true JPH10302840A (en) | 1998-11-13 |
Family
ID=14543616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9110750A Pending JPH10302840A (en) | 1997-04-28 | 1997-04-28 | Non-aqueous electrolyte secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10302840A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012156134A (en) * | 2011-01-24 | 2012-08-16 | Sb Limotive Co Ltd | Secondary battery |
-
1997
- 1997-04-28 JP JP9110750A patent/JPH10302840A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012156134A (en) * | 2011-01-24 | 2012-08-16 | Sb Limotive Co Ltd | Secondary battery |
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