JP2000067931A - Secondary battery - Google Patents

Secondary battery

Info

Publication number
JP2000067931A
JP2000067931A JP10238324A JP23832498A JP2000067931A JP 2000067931 A JP2000067931 A JP 2000067931A JP 10238324 A JP10238324 A JP 10238324A JP 23832498 A JP23832498 A JP 23832498A JP 2000067931 A JP2000067931 A JP 2000067931A
Authority
JP
Japan
Prior art keywords
filter
valve body
safety circuit
hole
secondary battery
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
JP10238324A
Other languages
Japanese (ja)
Inventor
Yoshinori Iwazono
芳宣 祝園
Kanehito Masumoto
兼人 増本
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 JP10238324A priority Critical patent/JP2000067931A/en
Priority to US09/529,403 priority patent/US6524739B1/en
Priority to DE69942331T priority patent/DE69942331D1/en
Priority to TW088114527A priority patent/TW432734B/en
Priority to CNB998014206A priority patent/CN1155127C/en
Priority to EP99940489A priority patent/EP1026761B1/en
Priority to PCT/JP1999/004599 priority patent/WO2000011737A1/en
Priority to KR10-2000-7004443A priority patent/KR100511357B1/en
Priority to CA002307193A priority patent/CA2307193C/en
Publication of JP2000067931A publication Critical patent/JP2000067931A/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

Abstract

PROBLEM TO BE SOLVED: To prevent an electrolyte from leaking outside by providing an assembled sealing plate with a filter connected to one electrode through a lead plate, a sub-filter coming into surface contact with the filter, a valve body formed of a metal thin plate to be ruptured by a predetermined pressure, a valve body rupturing ring, and a flexible wiring board on which a safety circuit electrically connected to the filter is mounted. SOLUTION: A cylindrical lithium battery has a filter 48, a sub-filter 49, a valve body 47, and a valve body rupturing ring 46. Explosion-proofing slits G are formed in the valve body 47, which is welded to the filter 48. An electrolyte gasified by heat generation pushes up the valve body 47 toward a safety circuit side through holes H of the filter 48. At that time, the pressure of the gas ruptures the slits G formed in the valve body 47, and thereby, the gas is released outside through a hole E formed in the safety circuit, holes I formed in the controlled positive input and output, and holes J formed in a safety circuit-use negative electrode, so that an explosion-proof measure is accomplished.

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、リチウムイオン二
次電池等の密閉型電池の封口部に、半導体からなる電流
遮断素子を含む電子回路で構成された安全回路を配置し
た二次電池に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery in which a safety circuit composed of an electronic circuit including a current interrupting element made of a semiconductor is arranged at a sealing portion of a sealed battery such as a lithium ion secondary battery.

【0002】[0002]

【従来の技術】密封型二次電池、とりわけリチウムイオ
ン二次電池は高エネルギー密度を有することからビデオ
カメラ、携帯電話、ノートブックパソコンなどの小型ポ
ータブル機器の駆動用電源としての需要が拡大してい
る。このリチウムイオン二次電池は、電池を過充電、過
放電及び過電流から保護する為の安全回路を含む安全装
置を必要としており、通常は、電池と安全回路としての
電気回路を筐体に組み込んだパック型電池として使用さ
れる。リチウムイオン二次電池を用いたパック形電池の
模式図を、図4に示す。1は円筒型のリチウムイオン二
次電池2、3をパック型電池を使用する機器に装着でき
る形状とした筺体、4はリチウムイオン二次電池2、3
と筺体1の端子間に挿入した安全回路である。このよう
な構成を有するパック形電池には、以下に説明するよう
な問題点があった。
2. Description of the Related Art Due to the high energy density of sealed secondary batteries, especially lithium ion secondary batteries, demand for power sources for driving small portable devices such as video cameras, mobile phones, and notebook computers has been increasing. I have. This lithium-ion secondary battery requires a safety device including a safety circuit to protect the battery from overcharge, overdischarge, and overcurrent, and usually incorporates the battery and an electric circuit as a safety circuit in a housing. Used as a battery pack. FIG. 4 is a schematic diagram of a pack-type battery using a lithium ion secondary battery. Reference numeral 1 denotes a case in which cylindrical lithium-ion secondary batteries 2 and 3 are shaped so that they can be attached to equipment using a pack-type battery; 4 denotes lithium-ion secondary batteries 2 and 3
And a safety circuit inserted between the terminals of the housing 1. The battery pack having such a configuration has problems as described below.

【0003】1)パック形電池を被供給装置に装着し易
いように、筐体1の形状およびデザインが形成されてい
るため、筐体1は被供給装置に対応した専用のものとな
る場合が多い。
[0003] 1) Since the shape and design of the housing 1 are formed so that the battery pack can be easily mounted on the device to be supplied, the housing 1 may be dedicated to the device to be supplied. Many.

【0004】2)筐体1が被供給装置に装着し易い形状
およびデザインになっているために、充電器も筐体1に
合わせる必要があり、被供給装置に対応する専用の充電
器になる場合が多い。
[0004] 2) Since the housing 1 has a shape and a design that can be easily mounted on the device to be supplied, the charger must also be adapted to the housing 1, and it is a dedicated charger corresponding to the device to be supplied. Often.

【0005】3)電池パックは、安全回路や被供給装置
に装着するための形状および端子構造にする必要があ
り、これらの体積は、収納されるリチウムイオン二次電
池2、3の体積に比べ極めて大きくなる。
[0005] 3) The battery pack needs to have a shape and a terminal structure for mounting on a safety circuit or a supplied device, and the volume of these batteries is smaller than the volume of the lithium ion secondary batteries 2 and 3 to be stored. Extremely large.

【0006】4)一般消費者は、被供給装置個々に適応
する電池パック及び充電器を購入しなければならず、不
経済である。
[0006] 4) The general consumer has to purchase a battery pack and a charger adapted to each supplied device, which is uneconomical.

【0007】このような問題点に対して、本発明者らは
先に、二次電池の上部にある封口部の内部、詳細には封
口板の最上部に位置するキャップとこの下に位置する電
流遮断弁との間、すなわち通常時は直接電解液に触れな
い部分に、超小型化した安全回路を配置する構造を提案
した。(特願平08−178896号)以下、上記構造
について以下に説明する。図5は封口部の断面図、図6
(a)は同封口部の分解斜視図、図6(b)は同封口部
の分解断面図を示している。
[0007] In order to solve such a problem, the present inventors have previously described a cap located at the top of the secondary battery, specifically, a cap located at the top of the sealing plate and a cap located below the cap. We proposed a structure in which a miniaturized safety circuit is placed between the current cutoff valve, that is, the part that does not directly touch the electrolyte in normal times. (Japanese Patent Application No. 08-178896) The above structure will be described below. FIG. 5 is a sectional view of the sealing portion, and FIG.
FIG. 6A is an exploded perspective view of the enclosed portion, and FIG. 6B is an exploded sectional view of the enclosed portion.

【0008】封口部は、電池発熱時の電流低減機能手段
であるPTC素子、電池内圧上昇時の電流遮断機能手
段,そしてさらに電池内圧が上昇した時の防爆機能手段
を有している。封口部は、フイルター17,サブフィル
ター18,インナーガスケット19,弁体20,PTC
素子21の順に載置され、さらにPTC素子21の上部
に安全回路27が実装されたフレキシブル配線板が配置
される。この安全回路は、防水性,防電解液のコーティ
ング、もしくは封止処理されている共に、フレキシブル
板に開口部、もしくはその一部が破断する構成としてい
る。
The sealing portion has a PTC element which is a current reducing function when the battery is heated, a current cutoff function when the internal pressure of the battery is increased, and an explosion-proof function when the internal pressure of the battery is increased. The sealing part is a filter 17, a sub-filter 18, an inner gasket 19, a valve body 20, a PTC
The flexible wiring board on which the safety circuit 27 is mounted is disposed on the PTC element 21 in the order of the elements 21. This safety circuit has a structure in which a waterproof or electrolytic solution is coated or sealed, and an opening or a part thereof is broken in the flexible plate.

【0009】二次電池に収容された発電要素のうち、正
極側はリード板を介して穴Cを有するフィルター17に
接続され、ついでこれと面接触し、穴Bを有するサブフ
ィルター18に通じるようになっている。更に、サブフ
ィルター18と弁体20とは溶着によって中央部が接合
されているため、正極の電流は、弁体20を通り、これ
と面接触したリング状のPTC素子21を通って安全回
路27に導かれる。
The positive electrode side of the power generating element housed in the secondary battery is connected to a filter 17 having a hole C via a lead plate, and then comes into surface contact therewith so as to pass through a sub-filter 18 having a hole B. It has become. Furthermore, since the sub-filter 18 and the valve element 20 are welded at the central portion by welding, the current of the positive electrode passes through the valve element 20 and passes through the ring-shaped PTC element 21 which is in surface contact therewith, and the safety circuit 27 It is led to.

【0010】さらに図8および図9において、PTC素
子21の電極は、ポリイミド材で構成されたフレキシブ
ル配線板38と面接触し、スルーホールや配線を通じて
安全回路27に接続されている。なお、Eは、フレキシ
ブル配線板38に設けられた防爆構造のための穴であ
る。一方、安全回路用マイナス極37は、フレキシブル
配線板38に面接触し、配線を通じて安全回路27に接
続されている。安全回路27によって制御される二次電
池28の入出力端子は、フレキシブル配線板38を通
じ、面接触で、二次電池の被制御プラス入出力39とな
る。なお、Fは安全回路27の防水性,耐電解液性のコ
ーティング、41,42はエポキシ系等の熱硬化型接着
剤、40,45は安全回路用マイナス極37と二次電池
の被制御プラス入出力39との間に接着固定したABS
樹脂等の絶縁物、44は封口板リングである。
8 and 9, the electrodes of the PTC element 21 are in surface contact with a flexible wiring board 38 made of a polyimide material and are connected to the safety circuit 27 through through holes and wires. E denotes a hole provided in the flexible wiring board 38 for an explosion-proof structure. On the other hand, the safety circuit negative electrode 37 is in surface contact with the flexible wiring board 38 and is connected to the safety circuit 27 through wiring. The input / output terminal of the secondary battery 28 controlled by the safety circuit 27 becomes a controlled plus input / output 39 of the secondary battery through surface contact through the flexible wiring board 38. F is a waterproof and electrolyte-resistant coating of the safety circuit 27, 41 and 42 are thermosetting adhesives such as epoxy, and 40 and 45 are a safety circuit negative electrode 37 and a controlled plus of the secondary battery. ABS fixed between input and output 39
An insulating material such as a resin, and 44 is a sealing plate ring.

【0011】電流低減機能は、規定温度になると抵抗値
が急上昇するPTC素子の特性を用いており、過充電、
または大きな放電電流、例えば1時間率での放電に相当
する電流値以上の電流によって電池の温度が上昇し、規
定温度に達すると抵抗値が上昇して電流を低減させるこ
とにより、電池が熱的に不安全な状態になることを防止
するものである。
The current reduction function uses the characteristics of a PTC element whose resistance value rises rapidly when the temperature reaches a specified temperature.
Alternatively, the battery temperature rises due to a large discharge current, for example, a current equal to or greater than the current value corresponding to a one-hour discharge, and when the battery temperature reaches a specified temperature, the resistance value rises to reduce the current. It is intended to prevent the situation from becoming unsafe.

【0012】一方、電流遮断機能は、発熱によってガス
化した電解液は、フィルター17の穴Cおよびサブフィ
ルター18に設けられた穴Bを介して、弁体20を電池
外部側に押し上げる。この際、ガスの圧力が、サブフィ
ルター18と弁体20との溶着力を上回った時点で溶着
が外れることにより、電気的な接続が遮断され、電流遮
断を行うものである。
On the other hand, in the current interruption function, the electrolyte gasified by heat generation pushes up the valve body 20 to the outside of the battery through the hole C of the filter 17 and the hole B provided in the sub-filter 18. At this time, when the pressure of the gas exceeds the welding force between the sub-filter 18 and the valve body 20, the welding is disconnected, so that the electrical connection is cut off and the current is cut off.

【0013】また、防爆機能は、次のように機能する。
すなわち、サブフィルター18と弁体20とによる電流
遮断が作動した後、発熱によってガス化した電解液は、
弁体20を更に押し上げる。一方、弁体20は、周囲が
固定されているため、ガスの圧力により弁体20に設け
られたスリットAが破断され、その時点で、ガス化した
電解液が外部に向けて放出される。
The explosion-proof function functions as follows.
That is, after the current cutoff by the sub-filter 18 and the valve element 20 is activated, the electrolytic solution gasified by heat generation is:
The valve body 20 is further pushed up. On the other hand, since the periphery of the valve body 20 is fixed, the slit A provided in the valve body 20 is broken by the pressure of the gas, and at that time, the gasified electrolyte is discharged to the outside.

【0014】次に安全回路27の構成について図7を参
照して説明する。図7において、+端子は安全回路27
によって制御される二次電池28の外部への入出力端
子、S端子は安全回路27のマイナス極で、被供給装置
または充電器の側で二次電池28の外周面または底面に
形成したマイナス極と接続する。−端子は二次電池28
の外周面または底面に形成したマイナス極である。
Next, the configuration of the safety circuit 27 will be described with reference to FIG. In FIG. 7, the + terminal is a safety circuit 27.
The input / output terminal and the S terminal to the outside of the secondary battery 28 controlled by the negative electrode of the safety circuit 27 are formed on the outer peripheral surface or the bottom surface of the secondary battery 28 on the side of the supplied device or the charger. Connect with -Terminal is a secondary battery 28
Is a minus pole formed on the outer peripheral surface or the bottom surface of.

【0015】S端子が被供給装置または充電器の側で二
次電池28のマイナス極と接続された状態にある場合、
PTC素子21の出力側とS端子との間の電圧が規定値
内にあると、封口部に内蔵された電圧検出器31は、F
ET等の電流遮断素子32をオンにし、充電器からの充
電を可能とする。一方、PTC素子21の出力側とS端
子との間の電圧が規定値より高くなると、電圧検出器3
1は、FET等の電流遮断素子32をオフにし、二次電
池28を過充電から保護する。
When the S terminal is connected to the negative electrode of the secondary battery 28 on the side of the device to be supplied or the charger,
When the voltage between the output side of the PTC element 21 and the S terminal is within a specified value, the voltage detector 31 built in the sealing portion
The current interrupting element 32 such as ET is turned on to enable charging from the charger. On the other hand, when the voltage between the output side of the PTC element 21 and the S terminal becomes higher than a specified value, the voltage detector 3
1 turns off the current interrupting element 32 such as an FET and protects the secondary battery 28 from overcharging.

【0016】安全回路27は以上ような機能を発揮する
が、電流遮断素子32にFETを使用する場合、FET
がオフの状態であっても、そのボディダイオード効果に
より、+端子を通じて二次電池28の放電が可能であ
る。
Although the safety circuit 27 exhibits the above function, when the FET is used as the current interrupting element 32,
Is turned off, the secondary battery 28 can be discharged through the + terminal by the body diode effect.

【0017】[0017]

【発明が解決しようとする課題】上記構成を有する封口
部において、PTC素子21は規定温度になると抵抗値
が急上昇する素子であり、導電性を有するポリマー材料
から形成される。PTC素子を具備した電池に対して過
充電、または大きな放電電流、例えば1時間放電に相当
する電流値以上の電流が印加されると、電池温度が上昇
し、規定温度に達するとPTC素子の抵抗値が上昇した
状態(以下、トリップ状態とする)となる。これにより
電池に印加される電流が低減され、熱的に不安全な状態
になることを防止する。PTC素子は、抵抗値が上昇す
る温度域では、その体積が膨張し、通常の温度域に復帰
すると収縮する。したがって、PCT素子はその作動に
伴って体積変化を伴う。
In the sealing portion having the above structure, the PTC element 21 is an element whose resistance value rises sharply at a specified temperature, and is made of a conductive polymer material. When an overcharge or a large discharge current is applied to a battery having a PTC element, for example, a current greater than a current value corresponding to one hour of discharge is applied, the battery temperature rises. The value is increased (hereinafter, referred to as a trip state). As a result, the current applied to the battery is reduced, thereby preventing the battery from being in an unsafe state. The PTC element expands in a temperature range where the resistance value rises, and contracts when returning to a normal temperature range. Therefore, the PCT element is accompanied by a volume change with its operation.

【0018】図5に示すように封口部におけるPCT素
子は、その外周部をインナーガスケット19およびフィ
ルター17によるカシメにより固定されている。PCT
がトリップ状態と通常状態への復帰を繰り返すと、PC
T素子の体積変化に起因して、カシメ部分に対して応力
が付加されることになる。カシメ部分にゆるみが生じ
る。この部位に微少な間隙が生じてしまう。さらに、こ
の間隙を通じて電解液が外部に漏出してしまう漏液が発
生するという問題があった。
As shown in FIG. 5, the outer periphery of the PCT element in the sealing portion is fixed by caulking with an inner gasket 19 and a filter 17. PCT
Repeatedly returns to the trip state and the normal state.
Due to the volume change of the T element, stress is applied to the swaged portion. The swaged part becomes loose. A minute gap is generated in this portion. Further, there is a problem that the electrolyte leaks out through the gap to generate an electrolyte.

【0019】[0019]

【課題を解決するための手段】上記問題点を解決するた
めに、本発明の二次電池は、電池要素を収容した電池ケ
ースの開口部を封口する組立封口板に関するものであっ
て、組立封口板が、フィルター、弁体、安全回路を有す
るフレキシブル配線板を順に載置されており、安全回路
に電流遮断素子および温度検出手段を有する電子回路を
用いることで、PTC素子の正特性の感温抵抗機能に替
えて、異常温度検出による電流遮断を行う構成とする。
SUMMARY OF THE INVENTION In order to solve the above problems, a secondary battery according to the present invention relates to an assembled sealing plate for closing an opening of a battery case accommodating a battery element. A board has a filter, a valve body, and a flexible wiring board having a safety circuit mounted thereon in that order, and the electronic circuit having a current interrupting element and a temperature detecting means is used for the safety circuit, so that the positive temperature sensitivity of the PTC element is obtained. In place of the resistance function, a current interruption by abnormal temperature detection is performed.

【0020】このため、従来の組立封口板において、安
全回路と弁体との間に挿入されたPTC素子を廃止する
ことによって、PTC素子の体積変化に起因するカシメ
封口のゆるみの発生を防止し、漏液の発生を抑制するこ
とができる。
For this reason, in the conventional assembled sealing plate, by eliminating the PTC element inserted between the safety circuit and the valve body, it is possible to prevent the loosening of the swaged sealing due to the volume change of the PTC element. In addition, generation of liquid leakage can be suppressed.

【0021】[0021]

【発明の実施の形態】以下、本発明の実施形態について
説明する。
Embodiments of the present invention will be described below.

【0022】請求項1に記載の発明は、発電要素を収容
した電池ケース、および電池ケースの開口部にガスケッ
トを介して装着された組立封口板を具備した二次電池で
あって、組立封口板が、発電要素の一方の電極にリード
板を介して接続されたフィルター、このフィルターに面
接触し、中央部に透孔を有するサブフィルター、所定の
圧力で破断する金属薄板からなる弁体、透孔を有する弁
体破断リング、フィルターに電気的に接続された安全回
路が実装されたフレキシブル配線板、前記安全回路に電
気的に接続され、且つ透孔を有するキャップが載置され
た構造を有し、安全回路が温度検出手段および電流遮断
素子を有することを特徴とする。
According to the first aspect of the present invention, there is provided a secondary battery including a battery case accommodating a power generating element, and an assembled sealing plate attached to an opening of the battery case via a gasket. A filter connected to one electrode of the power generating element via a lead plate, a sub-filter having a through hole in the center in surface contact with the filter, a valve body made of a thin metal plate which breaks at a predetermined pressure, A valve body breaking ring having a hole, a flexible wiring board on which a safety circuit electrically connected to a filter is mounted, and a cap electrically connected to the safety circuit and having a through hole are mounted. And the safety circuit has a temperature detecting means and a current cutoff element.

【0023】この構成によれば、PTCを内蔵し、カシ
メ封口を行った組立封口板に生じ易いトリップ後のカシ
メ部分のゆるみと、これに伴う漏液の発生を回避するこ
とができる。
According to this configuration, it is possible to avoid the loosening of the swaged portion after the trip, which is likely to occur in the assembled sealing plate in which the PTC is built in and the swaged sealing is performed, and the occurrence of liquid leakage due to this.

【0024】また、PTC素子を廃することで、PTC
素子が有する抵抗による内部抵抗を減少させる事ができ
る。具体的には、電池サイズ18650(松下電池工業
株式会社製)に本発明の構成を適用した場合には、PT
C素子の抵抗値に相当する約50mΩがなくなったこと
により、電池単体の内部抵抗値を約40%削減できる特
有の効果を奏する。
Also, by eliminating the PTC element, the PTC
The internal resistance due to the resistance of the element can be reduced. Specifically, when the configuration of the present invention is applied to a battery size of 18650 (manufactured by Matsushita Battery Industry Co., Ltd.), PT
The removal of about 50 mΩ corresponding to the resistance value of the C element has a specific effect of reducing the internal resistance value of the battery unit by about 40%.

【0025】また、本電池の二次電池は、温度検出手
段、電流遮断素子を含む電子回路も用いた安全回路を用
いているために、電流遮断素子を活用して弁体における
電流遮断機能も併せて付与することも可能である。
Further, since the secondary battery of the present battery uses a safety circuit using an electronic circuit including a temperature detecting means and a current interrupting element, the current interrupting function in the valve body is also achieved by utilizing the current interrupting element. It is also possible to provide them together.

【0026】本発明の請求項3に記載の発明は、発電要
素を収容した電池ケース、および電池ケースの開口部に
ガスケットを介して装着された組立封口板を具備した二
次電池であって、組立封口板が、発電要素の一方の電極
にリード板を介して接続されたフィルター、このフィル
ターに面接触し、中央部に透孔を有するサブフィルタ
ー、所定の圧力で破断する金属薄板からなる弁体、透孔
を有する弁体破断リング、フィルターに電気的に接続さ
れた安全回路が実装されたフレキシブル配線板、前記安
全回路に電気的に接続され、且つ透孔を有するキャップ
が載置された構造を有し、安全回路が電流遮断素子と電
池内圧検出手段を有することを特徴とする。
According to a third aspect of the present invention, there is provided a secondary battery including a battery case accommodating a power generation element, and an assembled sealing plate attached to an opening of the battery case via a gasket, A filter whose assembled sealing plate is connected to one electrode of a power generating element via a lead plate, a sub-filter having a through hole in the center in surface contact with the filter, and a valve made of a thin metal plate that breaks at a predetermined pressure. A body, a valve body breaking ring having a through hole, a flexible wiring board on which a safety circuit electrically connected to the filter is mounted, and a cap electrically connected to the safety circuit and having a through hole are mounted. And a safety circuit having a current interrupting element and a battery internal pressure detecting means.

【0027】この構成によれば、安全回路が電池内圧の
上昇を検出するために、従来の組立封口板における、フ
ィルターと弁体とを溶着することで、内圧の上昇を検出
し、充放電経路となるフィルターと弁体との電気的接続
を遮断する機能を果たすことができる。この電流遮断弁
機能に廃止より、規定圧力で電流遮断機構を作用させる
ための、サブフィルターと弁体との溶着強度管理をなく
すことが可能となり、組立封口板の製造工程の大幅な効
率化をはかることができる。弁体は、単に電池内圧が異
常上昇した際の、防爆機能のみを果たすこととなる。
According to this configuration, the safety circuit detects the rise in the internal pressure by welding the filter and the valve element in the conventional assembly sealing plate in order to detect the rise in the internal pressure of the battery. And a function of interrupting the electrical connection between the filter and the valve element. The abolition of this current cutoff valve function makes it possible to eliminate the need to control the welding strength between the sub-filter and the valve body to allow the current cutoff mechanism to operate at the specified pressure, greatly improving the efficiency of the assembly sealing plate manufacturing process. Can be measured. The valve element only performs an explosion-proof function when the battery internal pressure rises abnormally.

【0028】さらに、弁体の中央部をフィルターに溶接
し、電池内圧上昇時の弁体の変位量を減らすことによっ
て、組立封口板の更なる薄型化及び簡素化が可能となっ
た。
Further, by welding the central portion of the valve body to the filter to reduce the displacement of the valve body when the internal pressure of the battery rises, the assembly sealing plate can be made thinner and simpler.

【0029】以下、図1から図3を用いて、本発明に係
る二次電池の構成について詳細に説明し、その理解に供
する。
Hereinafter, the structure of the secondary battery according to the present invention will be described in detail with reference to FIGS.

【0030】図1は、本発明の実施形態における安全回
路のブロック図である。この回路構成によれば、PTC
素子及び電流遮断弁を廃止したものである。PTC素子
の機能及び電流遮断弁の機能が無くなっている点を除い
て、従来例における回路構成と同じであり、動作説明を
省略する。
FIG. 1 is a block diagram of a safety circuit according to an embodiment of the present invention. According to this circuit configuration, PTC
The element and the current cutoff valve have been eliminated. Except that the function of the PTC element and the function of the current cutoff valve are eliminated, the circuit configuration is the same as that of the conventional example, and the description of the operation is omitted.

【0031】図2は、本発明を説明に供する円筒型リチ
ウムイオン二次電池における組立封口板の断面図であ
る。この図において、組立封口板、発電要素の一方の電
極にリード板を介して接続されたフィルター48、この
フィルターに面接触し、中央部に透孔を有するサブフィ
ルター49、所定の圧力で破断する金属薄板からなる弁
体47、透孔を有する弁体破断リング46、フィルター
に電気的に接続された安全回路が実装されたフレキシブ
ル配線板27、安全回路に電気的に接続され、且つ透孔
を有するキャップが載置された構造を有する。弁体47
には防爆の為のスリットGが構成されており、さらにフ
ィルター48と溶着される。発熱によってガス化した電
解液は、フィルター48の穴Hを介して弁体47を、安
全回路27側へ押し上げる。この際、ガスの圧力が、弁
体47に設けられたスリットGを破断することにより、
安全回路27に設けられた穴E、被制御プラス入・出力
に設けられた穴I、安全回路用マイナス極に設けられた
穴Jを通して外部に放出され、防爆処置される。
FIG. 2 is a sectional view of an assembled sealing plate in a cylindrical lithium ion secondary battery for explaining the present invention. In this figure, an assembling sealing plate, a filter 48 connected to one electrode of a power generating element via a lead plate, a surface contact with the filter, a sub-filter 49 having a through hole in the center, and breaking at a predetermined pressure. A valve element 47 made of a thin metal plate, a valve element breaking ring 46 having a through hole, a flexible wiring board 27 on which a safety circuit electrically connected to a filter is mounted, and a through hole that is electrically connected to the safety circuit. Having a cap mounted thereon. Valve element 47
Is provided with a slit G for explosion protection, and is further welded to the filter 48. The electrolyte gasified by heat generation pushes up the valve body 47 through the hole H of the filter 48 to the safety circuit 27 side. At this time, the gas pressure breaks the slit G provided in the valve body 47,
It is discharged to the outside through a hole E provided in the safety circuit 27, a hole I provided in the controlled plus input / output, and a hole J provided in the minus pole for the safety circuit, and subjected to explosion-proof treatment.

【0032】図3は、図2に示した防爆弁47の作動直
前の状態を示す図であり、弁体は斜め方向に変位するこ
とで、封口板の厚みを減少させることができる。
FIG. 3 is a view showing a state immediately before the operation of the explosion-proof valve 47 shown in FIG. 2. By displacing the valve body in an oblique direction, the thickness of the sealing plate can be reduced.

【0033】[0033]

【発明の効果】以上説明したような本発明の二次電池
は、PTC素子のトリップによるカシメ部分のゆるみ
と、これに伴なう漏液の問題を解決できるという、有利
な効果が得られる。
The rechargeable battery of the present invention as described above has an advantageous effect that it can solve the problem of loosening of the swaged portion due to the trip of the PTC element and the accompanying problem of liquid leakage.

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

【図1】本実施形態における安全回路のブロック図FIG. 1 is a block diagram of a safety circuit according to an embodiment.

【図2】本実施形態における組立封口板の断面図FIG. 2 is a sectional view of an assembled sealing plate according to the embodiment.

【図3】本実施形態における弁体の作動状態を示す図FIG. 3 is a diagram showing an operation state of a valve body according to the embodiment.

【図4】パック型電池の模式図FIG. 4 is a schematic view of a battery pack.

【図5】特願平08−178896号における組立封口
板の断面図
FIG. 5 is a sectional view of an assembled sealing plate in Japanese Patent Application No. 08-178896.

【図6】同分解斜視図FIG. 6 is an exploded perspective view of the same.

【図7】同部品構成図FIG. 7 is a view showing the configuration of the same part.

【符号の説明】[Explanation of symbols]

1 筐体 2,3 円筒型リチウムイオン二次電池 4 安全回路 5 プラス端子 6 PTC素子 7,8 FET 9 温度ヒューズ 44 封口板リング 46 弁体破断用リング 47 弁体 DESCRIPTION OF SYMBOLS 1 Case 2, 3 Cylindrical lithium ion secondary battery 4 Safety circuit 5 Positive terminal 6 PTC element 7, 8 FET 9 Thermal fuse 44 Sealing plate ring 46 Valve body breaking ring 47 Valve body

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) H02J 7/10 H02J 7/10 L Fターム(参考) 5G003 BA01 CB01 CB04 CC02 FA03 FA04 5H012 AA01 BB04 CC01 DD02 DD05 EE04 FF01 GG01 5H022 AA09 CC02 CC06 KK01 5H029 AJ12 AK00 AL00 AM01 BJ02 5H030 AA03 AA07 AA10 AS05 AS11 BB01 FF43 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H02J 7/10 H02J 7/10 LF term (Reference) 5G003 BA01 CB01 CB04 CC02 FA03 FA04 5H012 AA01 BB04 CC01 DD02 DD05 EE04 FF01 GG01 5H022 AA09 CC02 CC06 KK01 5H029 AJ12 AK00 AL00 AM01 BJ02 5H030 AA03 AA07 AA10 AS05 AS11 BB01 FF43

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】発電要素を収容した電池ケース、および電
池ケースの開口部にガスケットを介して装着された組立
封口板を具備した二次電池であって、 前記組立封口板が、発電要素の一方の電極にリード板を
介して接続されたフィルター、このフィルターに面接触
し、中央部に透孔を有するサブフィルター、所定の圧力
で破断する金属薄板からなる弁体、透孔を有する弁体破
断リング、前記フィルターに電気的に接続された安全回
路が実装されたフレキシブル配線板、前記安全回路に電
気的に接続され、且つ透孔を有するキャップが載置され
た構造を有し、前記安全回路が温度検出手段および回路
を有することを特徴とする二次電池。
1. A secondary battery comprising: a battery case accommodating a power generating element; and an assembled sealing plate attached to an opening of the battery case via a gasket, wherein the assembled sealing plate is one of the power generating elements. Filter connected through a lead plate to the electrode, a sub-filter in surface contact with this filter and having a through hole in the center, a valve body made of a thin metal plate that breaks at a predetermined pressure, and a valve body with a through hole A ring, a flexible wiring board on which a safety circuit electrically connected to the filter is mounted, and a structure electrically connected to the safety circuit and having a cap having a through hole mounted thereon; Has a temperature detecting means and a circuit.
【請求項2】前記キャップが、相互に電気的に絶縁され
た内側キャップと、外側キャップ、からなる請求項1記
載の二次電池。
2. The secondary battery according to claim 1, wherein said cap comprises an inner cap and an outer cap which are electrically insulated from each other.
【請求項3】発電要素を収容した電池ケース、および電
池ケースの開口部にガスケットを介して装着された組立
封口板を具備した二次電池であって、 前記組立封口板が、発電要素の一方の電極にリード板を
介して接続されたフィルター、このフィルターに面接触
し、中央部に透孔を有するサブフィルター、所定の圧力
で破断する金属薄板からなる弁体、透孔を有する弁体破
断リング、前記フィルターに電気的に接続された安全回
路が実装されたフレキシブル配線板、前記安全回路に電
気的に接続され、且つ透孔を有するキャップが載置され
た構造を有し、前記安全回路が安全回路が電流遮断素子
と電池内圧検出手段を有することを特徴とする二次電
池。
3. A secondary battery comprising: a battery case accommodating a power generating element; and an assembled sealing plate mounted on an opening of the battery case via a gasket, wherein the assembled sealing plate is one of the power generating elements. Filter connected through a lead plate to the electrode, a sub-filter in surface contact with this filter and having a through hole in the center, a valve body made of a thin metal plate that breaks at a predetermined pressure, and a valve body with a through hole A ring, a flexible wiring board on which a safety circuit electrically connected to the filter is mounted, and a structure electrically connected to the safety circuit and having a cap having a through hole mounted thereon; A secondary battery according to claim 1, wherein the safety circuit has a current interrupting element and a battery internal pressure detecting means.
【請求項4】前記弁体の中央部と前記フィルターが接続
されている請求項3記載の二次電池。
4. The secondary battery according to claim 3, wherein a central portion of the valve body and the filter are connected.
JP10238324A 1998-08-25 1998-08-25 Secondary battery Pending JP2000067931A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP10238324A JP2000067931A (en) 1998-08-25 1998-08-25 Secondary battery
US09/529,403 US6524739B1 (en) 1998-08-25 1998-08-25 Secondary battery
DE69942331T DE69942331D1 (en) 1998-08-25 1999-08-25 SECONDARY BATTERY
TW088114527A TW432734B (en) 1998-08-25 1999-08-25 Secondary battery
CNB998014206A CN1155127C (en) 1998-08-25 1999-08-25 Secondary battery
EP99940489A EP1026761B1 (en) 1998-08-25 1999-08-25 Secondary battery
PCT/JP1999/004599 WO2000011737A1 (en) 1998-08-25 1999-08-25 Secondary battery
KR10-2000-7004443A KR100511357B1 (en) 1998-08-25 1999-08-25 Secondary battery
CA002307193A CA2307193C (en) 1998-08-25 1999-08-25 Secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10238324A JP2000067931A (en) 1998-08-25 1998-08-25 Secondary battery

Publications (1)

Publication Number Publication Date
JP2000067931A true JP2000067931A (en) 2000-03-03

Family

ID=17028526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10238324A Pending JP2000067931A (en) 1998-08-25 1998-08-25 Secondary battery

Country Status (1)

Country Link
JP (1) JP2000067931A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100492883B1 (en) * 2000-09-01 2005-05-31 가부시키카이샤 나브코 Pneumatic pressure control device
JP2007305323A (en) * 2006-05-09 2007-11-22 Sony Corp Battery
JP2010176530A (en) * 2009-01-30 2010-08-12 Buffalo Inc Router device
JP2016015228A (en) * 2014-07-01 2016-01-28 株式会社豊田自動織機 Current cutoff device, power storage device, manufacturing method of current cutoff device and manufacturing method of power storage device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100492883B1 (en) * 2000-09-01 2005-05-31 가부시키카이샤 나브코 Pneumatic pressure control device
JP2007305323A (en) * 2006-05-09 2007-11-22 Sony Corp Battery
JP2010176530A (en) * 2009-01-30 2010-08-12 Buffalo Inc Router device
JP4647011B2 (en) * 2009-01-30 2011-03-09 株式会社バッファロー Router device
JP2016015228A (en) * 2014-07-01 2016-01-28 株式会社豊田自動織機 Current cutoff device, power storage device, manufacturing method of current cutoff device and manufacturing method of power storage device

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