JPH11250895A - Battery - Google Patents

Battery

Info

Publication number
JPH11250895A
JPH11250895A JP10049142A JP4914298A JPH11250895A JP H11250895 A JPH11250895 A JP H11250895A JP 10049142 A JP10049142 A JP 10049142A JP 4914298 A JP4914298 A JP 4914298A JP H11250895 A JPH11250895 A JP H11250895A
Authority
JP
Japan
Prior art keywords
battery
negative electrode
negative
electrode
current collector
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
Application number
JP10049142A
Other languages
Japanese (ja)
Inventor
Ichiro Matsuhisa
一朗 松久
Tomokichi Yonehara
倫吉 米原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10049142A priority Critical patent/JPH11250895A/en
Publication of JPH11250895A publication Critical patent/JPH11250895A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Landscapes

  • Cell Electrode Carriers And Collectors (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

PROBLEM TO BE SOLVED: To increase discharging capacity and to prevent rupture, ignition in overcharging and to increase a field by installing a cut line between a negative active material and the connecting part of a negative lead so as to easily cut, and cutting a negative current collector in overcharging of a battery to separate a negative electrode from the negative lead. SOLUTION: A negative electrode 1 formed by applying carbon serving as an negative active material to copper foil and a positive electrode 2 using lithium cobaltate as a positive active material are spirally wound through a separator, and one end of a negative lead 5 is connected to a part to which the negative active material is not applied, of a negative current collector 4 at the final end of the negative electrode 1. One end of a positive lead 6 is connected to the positive electrode 2. A perforated cut line 7 which is easily cut is formed between the negative lead 5 and the negative active material in the negative current collector 4 at the final end of the negative electrode 1. An electrode group formed by winding the negative electrode 1, the positive electrode 2, and the separator is put into a battery case made of a nickel-plated steel plate, an electrolyte is poured into the battery case, the battery case is sealed with a sealing cover.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、電池における過充
電時の安全性に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to safety of a battery when overcharged.

【0002】[0002]

【従来の技術】電池は一般的に正極,負極,セパレータ
からなる極板群を巻回した状態で電池ケースに挿入し、
そこに電解液を注入し、電池ケースの開口部を封口蓋を
用いて封口して作製している。ここで外部に電圧を取り
出すため、金属リボンを集電体として用いて、負極と電
池ケースを接続し、正極と封口蓋を接続している。そし
て、電池に規定以上の電圧で充電し続けた場合、過充電
となり電池が破裂・発火する危険性がある。そこで、充
電電流遮断機構を封口蓋に設置して過充電を防止してい
る。充電電流遮断機構は、過充電時の電池内部でのガス
発生に伴う電池内部の圧力上昇を検知して電流を遮断す
ることが一般的である。
2. Description of the Related Art In general, a battery is inserted into a battery case in a state in which an electrode group including a positive electrode, a negative electrode, and a separator is wound.
An electrolytic solution is injected therein, and the opening of the battery case is sealed using a sealing lid. Here, in order to take out voltage to the outside, the negative electrode and the battery case are connected, and the positive electrode and the sealing lid are connected using a metal ribbon as a current collector. If the battery is continuously charged at a voltage higher than the specified voltage, the battery may be overcharged and the battery may explode or catch fire. Therefore, a charging current cutoff mechanism is provided on the sealing lid to prevent overcharging. Generally, the charging current cutoff mechanism detects a pressure rise inside the battery due to gas generation inside the battery at the time of overcharge, and cuts off the current.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記電
流遮断機構を封口装置に設置した構成の電池では、封口
装置において電池の高さ方向でスペースが必要となり、
発電要素を収納するスペースが少なくなり、電池の電池
容量の向上を図る上での障害となった。また、電池内圧
を検知させるため、その圧力設定の信頼性を確保するた
めに複雑な機構と生産工程管理が必要であり、生産工程
の歩留まりを下げる要因となっていた。
However, in a battery having a structure in which the current interrupting mechanism is installed in a sealing device, a space is required in the height direction of the battery in the sealing device.
The space for accommodating the power generating element is reduced, which is an obstacle in improving the battery capacity of the battery. Further, in order to detect the internal pressure of the battery, a complicated mechanism and production process management are required to ensure the reliability of the pressure setting, which has been a factor of lowering the yield of the production process.

【0004】本発明はこのような課題に対応すべく、特
別なスペースを必要とすることなく、従って電池の放電
容量を大きくし過充電時の電池の破裂・発火を防止し、
生産工程の歩留まり向上ができる充電電流遮断機能を実
現することにより、安定した電池性能を有する電池を提
供することを目的とするものである。
[0004] In order to cope with such a problem, the present invention does not require a special space, and therefore increases the discharge capacity of the battery to prevent the battery from bursting or firing at the time of overcharging.
It is an object of the present invention to provide a battery having stable battery performance by realizing a charging current interrupting function capable of improving the yield of a production process.

【0005】[0005]

【課題を解決するための手段】本発明は上記課題を解決
するために、電池内に収納された極板群の負極集電体を
過充電時に切断させるようにしたことを特徴とするもの
であり、本発明の構造を用いることで、発電要素の極板
群の収納スペースの向上が確保でき、電池容量の大幅な
向上ならびに封口蓋の製造が容易となり、生産性がよ
い。
In order to solve the above-mentioned problems, the present invention is characterized in that a negative electrode current collector of an electrode group housed in a battery is cut off when overcharged. In addition, by using the structure of the present invention, an improvement in the storage space for the electrode plate group of the power generation element can be ensured, the battery capacity can be significantly improved, and the production of the sealing lid can be facilitated, and the productivity is good.

【0006】[0006]

【発明の実施の形態】本発明の実施の形態について以下
に示す。
Embodiments of the present invention will be described below.

【0007】図1に示すように、カーボンを負極活物質
として銅箔に塗着して構成した負極1と、コバルト酸リ
チウムを正極活物質とした正極2をセパレータ3を介在
して複数回渦巻状に巻回し、負極1の終端部において負
極活物質が塗着されていない銅箔の負極集電体4にニッ
ケルリボン製の負極リード5の一端を接続する。一方、
正極2には正極リード6の一端を接続する。そして、前
記する負極1の終端部に構成される銅箔製の負極集電体
4には負極リード5と負極活物質との間に通称ミシン目
という切断し易い切断線7が特別に設けられる。
As shown in FIG. 1, a negative electrode 1 formed by coating carbon foil as a negative electrode active material with carbon and a positive electrode 2 with lithium cobalt oxide as a positive electrode active material are spirally wound a plurality of times with a separator 3 interposed therebetween. One end of a negative electrode lead 5 made of nickel ribbon is connected to a negative electrode current collector 4 made of a copper foil on which the negative electrode active material is not applied at the terminal end of the negative electrode 1. on the other hand,
One end of a positive electrode lead 6 is connected to the positive electrode 2. In the negative electrode current collector 4 made of copper foil formed at the terminal end of the negative electrode 1, a cutting line 7, which is commonly called a perforation, is provided between the negative electrode lead 5 and the negative electrode active material. .

【0008】そして、図3に示すように、前記負極1と
正極2とセパレータ3とを巻回した極板群8はニッケル
めっき鋼板製の電池ケース9に装入し、電解液を注入し
た後、封口蓋10で電池ケース9の開口部は封口され
る。負極リード5の他端は電池ケース9の内底部に接続
され、正極リード6は封口蓋10に接続される。11は
極板群8の上部絶縁板、12は極板群8の下部絶縁板を
示す。電池ケース9の開口部付近に溝部9aを設け、こ
の溝部9aに封口蓋10を載せ、電池ケース9の開口部
をかしめる。
Then, as shown in FIG. 3, the electrode group 8 in which the negative electrode 1, the positive electrode 2, and the separator 3 are wound is charged into a battery case 9 made of a nickel-plated steel sheet, and after an electrolyte is injected. The opening of the battery case 9 is sealed by the sealing lid 10. The other end of the negative electrode lead 5 is connected to the inner bottom of the battery case 9, and the positive electrode lead 6 is connected to the sealing lid 10. Numeral 11 denotes an upper insulating plate of the electrode group 8, and 12 denotes a lower insulating plate of the electrode group 8. A groove 9 a is provided near the opening of the battery case 9, and the sealing lid 10 is placed in the groove 9 a, and the opening of the battery case 9 is swaged.

【0009】なお、電池ケース9の径は17.9mm、
溝部9aの内径は15.0mm、開口時の溝部9aから
電池ケース9の開口端部までは5.0mm、電池ケース
9の底部から電池ケース開口端部までは63.2mm、
そして極板群8は外径を17.0mm、長さを58.2
mmとした。
The diameter of the battery case 9 is 17.9 mm,
The inner diameter of the groove 9a is 15.0 mm, the distance from the groove 9a at the time of opening to the opening end of the battery case 9 is 5.0 mm, the distance from the bottom of the battery case 9 to the opening end of the battery case 9 is 63.2 mm,
The electrode group 8 has an outer diameter of 17.0 mm and a length of 58.2.
mm.

【0010】以上の構成の電池を本発明の実施例1の電
池とした。次に、前記実施例1の電池とは負極集電体に
切断し易い切断線を具備していない点のみが異なり、他
は実施例1の電池と全く同じ構成にした電池を比較例の
電池とした。従って、比較例の電池の極板群は巻回する
負極1の終端部の銅箔の負極集電体4にニッケルリボン
製の負極リード5を溶着し正極2とセパレータ3を介し
て巻回した図4に示す通りの構成であり、電池に組み立
てた場合の断面図は図3に示す通りである。
The battery having the above-mentioned structure was used as the battery of Example 1 of the present invention. Next, the battery of the comparative example is different from the battery of the first embodiment only in that the negative electrode current collector is not provided with a cutting line which is easily cut, and the battery having the same configuration as the battery of the first embodiment is otherwise provided. And Therefore, in the electrode group of the battery of the comparative example, the negative electrode lead 5 made of nickel ribbon was welded to the negative electrode current collector 4 of the copper foil at the end of the negative electrode 1 to be wound, and the negative electrode 1 was wound via the positive electrode 2 and the separator 3. The configuration is as shown in FIG. 4, and a cross-sectional view when assembled into a battery is as shown in FIG.

【0011】また、図2に示すように、負極活物質を銅
箔に塗着して構成した負極1の終端部に溶着するニッケ
ルリボン製の負極リード5に鋭利なエッジ部13を設け
る以外は前記する比較例の電池と同じ構成にした電池を
本発明の実施例2の電池とした。
As shown in FIG. 2, a sharp edge portion 13 is provided on a negative electrode lead 5 made of nickel ribbon which is welded to a terminal end portion of a negative electrode 1 formed by coating a negative electrode active material on a copper foil. A battery having the same configuration as the battery of the comparative example described above was designated as a battery of Example 2 of the present invention.

【0012】また、図5に示すように、正極端子装置1
4はPTC素子15,金属箔16を下方に重ねて内部ガ
スケット17で周縁が囲まれ、さらに上部フィルター1
8と下部フィルター19を下方に重ね、その外周部を全
体に外部ガスケット20で囲み、図示しない電池ケース
の開口に気密に嵌着した電池を従来例の電池とした。
Further, as shown in FIG.
Reference numeral 4 denotes a PTC element 15 and a metal foil 16 which are overlapped on the lower side, the periphery of which is surrounded by an internal gasket 17.
8 and the lower filter 19 were placed below, and the outer periphery thereof was entirely surrounded by an external gasket 20, and a battery airtightly fitted into an opening of a battery case (not shown) was defined as a conventional battery.

【0013】なお、上部フィルター18はその中央部2
1において金属箔16に溶着させる。
The upper filter 18 has a central portion 2
In 1, it is welded to the metal foil 16.

【0014】従って、前記構成の正極端子装置14はP
TC素子15,金属箔16,上部フィルター18ならび
に下部フィルター19を有する電流遮断機構を有するも
のであり、この正極端子装置14により極板群と電解液
を充填した電池ケースを封口したものである。
Therefore, the positive electrode terminal device 14 having the above-described structure is
It has a current cut-off mechanism having a TC element 15, a metal foil 16, an upper filter 18 and a lower filter 19. The positive electrode terminal device 14 seals the electrode plate group and a battery case filled with an electrolyte.

【0015】そして、上記した従来例の電池と、本発明
の実施例1の電池,実施例2の電池ならびに比較例の電
池をそれぞれ満充電した後、過充電を行い安全性を確認
した。すなわち、満充電は定電流定電圧方式で、最大電
圧4.2V、最大電流0.9Aで常温で2時間充電し、
一方、過充電は定電流1.3Aの連続充電を常温常湿の
環境で行った。
After the above-described conventional battery, the battery of Example 1 of the present invention, the battery of Example 2, and the battery of Comparative Example were fully charged, overcharge was performed to confirm safety. That is, full charge is a constant current constant voltage method, a maximum voltage of 4.2 V, a maximum current of 0.9 A, and charging at room temperature for 2 hours.
On the other hand, in the overcharging, continuous charging at a constant current of 1.3 A was performed in a normal temperature and normal humidity environment.

【0016】まず、従来例の電池は通常の充電方式であ
る定電流定電圧充電方式の上限電圧である4.2Vを超
えて無制限に充電されるので、過充電状態となり、電池
内部の活物質や電解液が分解され、電池内部でガスが発
生する。このガスによる電池内部の内圧が高まり、図5
に示す金属箔16が押し上げられ、電流遮断機構が作動
し充電開始から約60分で充電が停止し、破裂・発火に
は至らなかった。
First, the conventional battery is charged unlimitedly beyond the upper limit voltage of 4.2 V of the constant current / constant voltage charging system, which is a normal charging system, so that it is overcharged and the active material inside the battery is charged. And the electrolytic solution is decomposed, and gas is generated inside the battery. The internal pressure inside the battery is increased by this gas, and FIG.
The metal foil 16 shown in (1) was pushed up, the current cutoff mechanism was activated, charging was stopped in about 60 minutes from the start of charging, and no explosion or ignition occurred.

【0017】一方、電流遮断機構を備えていない比較例
の電池は、充電開始から約70分で破裂・発火した。
On the other hand, the battery of the comparative example having no current interruption mechanism burst and ignited in about 70 minutes from the start of charging.

【0018】しかしながら、実施例1の電池は充電開始
から約60分で従来例の電池と同じ時間で電流が遮断さ
れた。その理由は、過充電により、電極が過充電状態と
なり、活物質が膨張し極板の厚みが厚くなり、図3に示
す極板群8の直径方向への膨張により極板の長手方向の
引っ張りと厚み方向の圧迫により、図1に示す切断線7
が切断されるからであることが判明した。
However, the current of the battery of Example 1 was cut off at the same time as that of the conventional battery in about 60 minutes from the start of charging. The reason is that the electrode is overcharged due to overcharging, the active material expands and the thickness of the electrode plate becomes thicker, and the electrode plate group 8 shown in FIG. And pressure in the thickness direction, the cutting line 7 shown in FIG.
Was cut off.

【0019】また、実施例2の電池は、実施例1の電池
と同様の結果が得られた。これは図2に示す鋭利なエッ
ジ部13によって負極集電体4が切断されるからであっ
た。
The battery of Example 2 had the same results as the battery of Example 1. This is because the negative electrode current collector 4 is cut by the sharp edge portion 13 shown in FIG.

【0020】表1に上記した従来例の電池と本発明の実
施例1の電池と、実施例2の電池ならびに比較例の電池
の各評価結果を示す。
Table 1 shows the evaluation results of the above-mentioned conventional battery, the battery of Example 1 of the present invention, the battery of Example 2, and the battery of the comparative example.

【0021】[0021]

【表1】 [Table 1]

【0022】なお、表1において従来例の電池のみが放
電容量が少ないのは正極端子装置の電流遮断機構により
電池内の容量が少ないからである。
In Table 1, only the battery of the conventional example has a small discharge capacity because the capacity in the battery is small due to the current interruption mechanism of the positive electrode terminal device.

【0023】また、本発明の実施例1と実施例2の電池
において負極集電体4は銅箔製としているのは、銅箔は
柔軟性があって巻回し易く極板群の構成がし易いこと
と、実施例1の電池においては切断線7により切断し易
く、また実施例2の電池においては負極リード線に設け
た鋭利なエッジ部13により切断され易いからである。
In the batteries of the first and second embodiments of the present invention, the negative electrode current collector 4 is made of copper foil because the copper foil is flexible and easy to be wound, and the electrode group is formed. This is because the battery of Example 1 is easily cut by the cutting line 7, and the battery of Example 2 is easily cut by the sharp edge portion 13 provided on the negative electrode lead wire.

【0024】また、表1に示す結果は角型形状の電池に
ついて実施したところ同様の結果であることがわかっ
た。
Further, the results shown in Table 1 were found to be the same when the results were carried out for a square-shaped battery.

【0025】[0025]

【発明の効果】以上の説明から明らかなように、本発明
によれば、発電要素の極板群の収納スペースの向上が確
保でき、電池容量の向上ならびに封口蓋の製造が容易と
なり、生産性がよく、安定した信頼性の高い電池を供給
することができる。
As is apparent from the above description, according to the present invention, it is possible to secure an improvement in the storage space for the electrode plate group of the power generation element, to improve the battery capacity and to easily manufacture the sealing lid, and to improve the productivity. And a stable and highly reliable battery can be supplied.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例1の電池の極板群の要部を示す
平面図
FIG. 1 is a plan view showing a main part of an electrode plate group of a battery according to a first embodiment of the present invention.

【図2】本発明の実施例2の電池の負極板の要部を示す
断面図
FIG. 2 is a sectional view showing a main part of a negative electrode plate of a battery according to a second embodiment of the present invention.

【図3】本発明の実施例1,実施例2ならびに比較例の
電池の全体構成半裁断面図
FIG. 3 is a half sectional view of the entire configuration of the batteries of Example 1, Example 2 and Comparative Example of the present invention.

【図4】比較例の電池の極板群の要部を示す平面図FIG. 4 is a plan view showing a main part of an electrode group of a battery of a comparative example.

【図5】従来例の電池の正極端子装置の断面図FIG. 5 is a cross-sectional view of a conventional battery positive electrode terminal device.

【符号の説明】[Explanation of symbols]

1 負極 2 正極 3 セパレータ 4 負極集電体 5 負極リード 6 正極リード 7 切断線 8 極板群 9 電池ケース 10 封口蓋 11 上部絶縁板 12 下部絶縁板 13 鋭利なエッジ部 DESCRIPTION OF SYMBOLS 1 Negative electrode 2 Positive electrode 3 Separator 4 Negative current collector 5 Negative lead 6 Positive electrode lead 7 Cutting line 8 Electrode group 9 Battery case 10 Sealing lid 11 Upper insulating plate 12 Lower insulating plate 13 Sharp edge part

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 巻回する負極の終端部で負極リードを接
続した負極集電体の端部において、負極活物質と、前記
負極リードの接続部分との間に他の部分より切断し易い
切断線を設け、前記切断線により、電池の過充電時に前
記負極集電体が切断されて負極と負極リードとが分離し
て充電電流が遮断されるように構成したことを特徴とす
る電池。
At the end of a negative electrode current collector connected to a negative electrode lead at the end of a negative electrode to be wound, cutting is easier than other parts between the negative electrode active material and the connection part of the negative electrode lead. A negative electrode current collector is cut off when the battery is overcharged, the negative electrode and the negative electrode lead are separated, and the charging current is interrupted by the disconnection line.
【請求項2】 巻回する負極の終端部の負極集電体に接
続する負極リードにおいて、前記負極集電体に接触する
部分に鋭利なエッジ部を形成し、前記鋭利なエッジ部に
より、電池の過充電時に前記負極集電体が切断されて負
極と負極リードとが分離して充電電流が遮断されるよう
に構成したことを特徴とする電池。
2. A negative electrode lead connected to a negative electrode current collector at a terminal portion of a wound negative electrode, a sharp edge portion is formed at a portion in contact with the negative electrode current collector, and the sharp edge portion forms a battery. The battery is characterized in that the negative electrode current collector is cut off when the battery is overcharged, the negative electrode and the negative electrode lead are separated, and the charging current is interrupted.
【請求項3】 負極集電体は銅箔製としたことを特徴と
する請求項1または2に記載の電池。
3. The battery according to claim 1, wherein the negative electrode current collector is made of copper foil.
JP10049142A 1998-03-02 1998-03-02 Battery Pending JPH11250895A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10049142A JPH11250895A (en) 1998-03-02 1998-03-02 Battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10049142A JPH11250895A (en) 1998-03-02 1998-03-02 Battery

Publications (1)

Publication Number Publication Date
JPH11250895A true JPH11250895A (en) 1999-09-17

Family

ID=12822845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10049142A Pending JPH11250895A (en) 1998-03-02 1998-03-02 Battery

Country Status (1)

Country Link
JP (1) JPH11250895A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017062986A (en) * 2015-09-25 2017-03-30 株式会社豊田自動織機 Power storage device
CN111987285A (en) * 2020-09-14 2020-11-24 珠海冠宇电池股份有限公司 Positive plate and lithium ion battery comprising same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017062986A (en) * 2015-09-25 2017-03-30 株式会社豊田自動織機 Power storage device
CN111987285A (en) * 2020-09-14 2020-11-24 珠海冠宇电池股份有限公司 Positive plate and lithium ion battery comprising same

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