JPH1056742A - Rechargeable battery overcharge protection circuit - Google Patents
Rechargeable battery overcharge protection circuitInfo
- Publication number
- JPH1056742A JPH1056742A JP8207193A JP20719396A JPH1056742A JP H1056742 A JPH1056742 A JP H1056742A JP 8207193 A JP8207193 A JP 8207193A JP 20719396 A JP20719396 A JP 20719396A JP H1056742 A JPH1056742 A JP H1056742A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- circuit
- thermal fuse
- voltage
- series
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
(57)【要約】
【課題】 電池が異常な高電圧となって温度ヒューズが
溶断した後は、一切放電できないようにした安全性の高
い二次電池の過充電保護回路を提供する。
【解決手段】 電池電圧を検出し、電池電圧が設定値
以上になるとオン信号を出力する電圧検出回路、電池と
充電器との間に直列接続した２個の温度ヒューズ、並び
に、前記電圧検出回路のオン信号で動作するスイッチと
前記２個の温度ヒューズに熱的に結合された発熱素子と
が直列に接続され、かつ前記電池と１個の温度ヒューズ
との直列回路及び充電器と他方の温度ヒューズとの直列
回路に並列に接続された回路を具備する。
(57) [Problem] To provide a highly safe overcharge protection circuit for a secondary battery, in which after a battery becomes abnormally high voltage and a thermal fuse is blown, it cannot be discharged at all. SOLUTION: A voltage detection circuit for detecting a battery voltage and outputting an ON signal when the battery voltage exceeds a set value, two thermal fuses connected in series between a battery and a charger, and the voltage detection circuit And a heating element thermally coupled to the two thermal fuses are connected in series, and a series circuit of the battery and one thermal fuse and a charger and the other temperature The circuit includes a circuit connected in parallel to a series circuit with the fuse.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、二次電池、特にリ
チウム二次電池の過充電を防止するための過充電保護回
路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcharge protection circuit for preventing overcharge of a secondary battery, particularly a lithium secondary battery.
【０００２】[0002]
【従来の技術】近年、携帯型の電子機器の著しい発展と
普及に伴い、その主電源の二次電池の需要が著しく拡大
した。また、機器のさらなる小型化やメンテナンスフリ
ー化などの観点から、保存特性や耐漏液性に優れた高エ
ネルギー密度のリチウム二次電池が強く要望されてい
る。二次電池は、過充電や過放電によって性能が著しく
低下するから、二次電池を用いる電源装置には、過充電
および過放電を防止するための保護回路が設けてある。
特に、リチウム二次電池は、電池内部でガスを消失でき
ないから、過充電や過放電を避けなければならない。二
次電池の過充電を防止するための保護回路としては、非
復帰型や復帰型のものが各種提案されている。なかでも
電池の電圧が所定の設定電圧を越えたとき充電電流を遮
断する復帰型の保護回路と、その保護回路がなんらかの
原因で働かず電池電圧が異常に上昇したとき温度ヒュー
ズを溶断する非復帰型の保護回路を設けて二重の安全装
置とした構成のものが好ましい。2. Description of the Related Art In recent years, with the remarkable development and spread of portable electronic equipment, demand for a secondary battery as a main power supply has been remarkably expanded. In addition, from the viewpoint of further miniaturization and maintenance-free equipment, a high energy density lithium secondary battery having excellent storage characteristics and liquid leakage resistance has been strongly demanded. Since the performance of a secondary battery is significantly reduced due to overcharge or overdischarge, a power supply device using the secondary battery is provided with a protection circuit for preventing overcharge and overdischarge.
In particular, since a lithium secondary battery cannot lose gas inside the battery, overcharge and overdischarge must be avoided. As a protection circuit for preventing overcharge of the secondary battery, various types of non-return type and return type protection circuits have been proposed. Above all, a reset type protection circuit that shuts off the charging current when the battery voltage exceeds a predetermined set voltage, and a non-reset type that blows the thermal fuse when the battery voltage rises abnormally because the protection circuit does not work for any reason. It is preferable to provide a double safety device by providing a type protection circuit.
【０００３】図３は、そのような装置に用いられている
非復帰型の保護回路の例を示している。この保護回路
は、電池ブロック１の個々のセルブロックに並列に接続
されてセルブロックの電圧を検出する電圧検出回路２、
電池ブロック１を充電する充電器３、電池ブロック１と
充電器３との間に挿入された温度ヒューズ４、電圧検出
回路２からの信号によりオンするスイッチＳＷ、および
温度ヒューズ４に熱的に結合された発熱抵抗素子Ｒから
なり、スイッチＳＷと発熱抵抗素子Ｒとの直列回路は電
池ブロック１に並列に接続されている。この回路は、次
のように動作する。まず、電池ブロック１の個々のセル
ブロックのいずれかが所定の電圧を越えると、電圧検出
回路２がこれを検出してオン信号を出力し、スイッチＳ
Ｗがオンとなる。これにより、発熱抵抗素子Ｒに電流が
流れ、素子Ｒが発熱して温度ヒューズ４を加熱し、これ
を溶断する。温度ヒューズ４が溶断すれば、充電器と電
池ブロック１との接続は断たれるが、スイッチＳＷがオ
ンとなっているので、発熱抵抗素子Ｒは電池ブロック１
に直列接続された状態である。そのため、電池ブロック
１の放電電流が発熱抵抗素子Ｒを加熱し、電池を危険な
状態に至らせることとなる。FIG. 3 shows an example of a non-recovery type protection circuit used in such a device. The protection circuit includes a voltage detection circuit 2 that is connected in parallel to each cell block of the battery block 1 and detects a voltage of the cell block.
A charger 3 for charging the battery block 1, a thermal fuse 4 inserted between the battery block 1 and the charger 3, a switch SW that is turned on by a signal from the voltage detection circuit 2, and thermally coupled to the thermal fuse 4. The series circuit of the switch SW and the heating resistor R is connected to the battery block 1 in parallel. This circuit operates as follows. First, when any one of the individual cell blocks of the battery block 1 exceeds a predetermined voltage, the voltage detection circuit 2 detects this and outputs an ON signal, and the switch S
W turns on. As a result, a current flows through the heating resistance element R, and the element R generates heat to heat the temperature fuse 4 and blow it. When the thermal fuse 4 is blown, the connection between the charger and the battery block 1 is cut off. However, since the switch SW is turned on, the heating resistor R is connected to the battery block 1.
Are connected in series. Therefore, the discharge current of the battery block 1 heats the heating resistance element R, and brings the battery into a dangerous state.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、以上に鑑
み、電池が異常な電圧となって温度ヒューズが溶断した
後は、一切放電できないようにした安全性の高い二次電
池の過充電保護回路を提供することを目的とする。SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a highly safe overcharge protection for a secondary battery which cannot be discharged at all after the battery has an abnormal voltage and the thermal fuse has blown. It is intended to provide a circuit.
【０００５】[0005]
【課題を解決するための手段】本発明の二次電池の過充
電保護回路は、電池電圧を検出し、電池電圧が設定値以
上になるとオン信号を出力する電圧検出回路、電池と充
電器との間に直列接続した２個の温度ヒューズ、並び
に、前記電圧検出回路のオン信号で動作するスイッチと
前記２個の温度ヒューズに熱的に結合された発熱素子と
が直列に接続され、かつ前記電池と１個の温度ヒューズ
との直列回路及び充電器と他方の温度ヒューズとの直列
回路に並列に接続された回路を具備し、前記電池電圧が
設定値以上になると、電圧検出回路がオン信号を出力し
て前記スイッチをオン動作させ、発熱素子を発熱させて
前記両温度ヒューズを溶断するように構成したものであ
る。An overcharge protection circuit for a secondary battery according to the present invention detects a battery voltage, and outputs an ON signal when the battery voltage exceeds a set value, a battery and a charger. Two temperature fuses connected in series, and a switch operated by an ON signal of the voltage detection circuit and a heating element thermally coupled to the two temperature fuses are connected in series, and A circuit connected in parallel with a series circuit of a battery and one thermal fuse and a series circuit of a charger and the other thermal fuse, and when the battery voltage exceeds a set value, an on signal Is output to turn on the switch to cause the heat generating element to generate heat and blow the two temperature fuses.
【０００６】また、本発明の二次電池の過充電保護回路
は、電池電圧を検出し、電池電圧が設定値以上になると
オン信号を出力する電圧検出回路、電池と充電器との間
に挿入された第１の温度ヒューズ、前記電圧検出回路の
オン信号で動作するスイッチと溶断温度が第１の温度ヒ
ューズのそれより高く設定された第２の温度ヒューズと
前記両温度ヒューズに熱的に結合された発熱素子とが直
列に接続され、前記第１の温度ヒューズと充電器との直
列回路に並列に接続された回路を具備し、前記電池電圧
が設定値以上になると、電圧検出回路がオン信号を出力
して前記スイッチをオン動作させ、発熱素子を発熱させ
て第１の温度ヒューズ及び第２の温度ヒューズを順次溶
断するように構成したものである。Further, the overcharge protection circuit for a secondary battery according to the present invention detects a battery voltage and outputs an ON signal when the battery voltage exceeds a set value, and is inserted between the battery and the charger. A first temperature fuse, a switch operated by an ON signal of the voltage detection circuit, and a second temperature fuse whose fusing temperature is set higher than that of the first temperature fuse, and the two temperature fuses. And a circuit connected in series with the series circuit of the first thermal fuse and the charger, and when the battery voltage exceeds a set value, the voltage detection circuit is turned on. The switch is turned on by outputting a signal to cause the heat generating element to generate heat so that the first thermal fuse and the second thermal fuse are sequentially blown.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。 《実施の形態１》図１は、本発明の二次電池の過充電保
護回路を適用した電源装置を示している。電池ブロック
１０は、各々リチウム二次電池の単セルが並列接続され
たセルブロック１１、セルブロック１２、およびセルブ
ロック１３が直列に接続されたものである。各セルブロ
ックには、並列に電圧検出回路（１）１４と電圧検出回
路（２）１５とが接続されている。電池ブロック１０と
充電器１６との間には、充電制御用スイッチ１７、放電
制御用スイッチ１８、温度ヒューズ（１）１９および温
度ヒューズ（２）２０が直列に接続されている。温度ヒ
ューズ（１）１９および温度ヒューズ（２）２０は、同
じ溶断温度を有するものである。温度ヒューズ（１）１
９および温度ヒューズ（２）２０と熱的に結合された抵
抗素子からなる発熱素子２１は、温度ヒューズ（１）１
９と温度ヒューズ（２）２０との中点に接続され、この
発熱素子２１と電池ブロック１０の負極との間にスイッ
チ２２が接続されている。そして、電圧検出回路（１）
１４の出力端は充電制御用スイッチ１７および放電制御
用スイッチ１８に接続され、電圧検出回路（２）１５の
出力端はスイッチ２２に接続されている。Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 shows a power supply device to which an overcharge protection circuit for a secondary battery according to the present invention is applied. The battery block 10 is configured by serially connecting cell blocks 11, 12, and 13 in which single cells of a lithium secondary battery are connected in parallel. A voltage detection circuit (1) 14 and a voltage detection circuit (2) 15 are connected to each cell block in parallel. A charge control switch 17, a discharge control switch 18, a temperature fuse (1) 19, and a temperature fuse (2) 20 are connected in series between the battery block 10 and the charger 16. The thermal fuse (1) 19 and the thermal fuse (2) 20 have the same fusing temperature. Thermal fuse (1) 1
9 and a thermal element (21) composed of a resistance element thermally coupled to the thermal fuse (2) 20.
A switch 22 is connected between the heating element 21 and the negative electrode of the battery block 10. And a voltage detection circuit (1)
The output terminal 14 is connected to the charge control switch 17 and the discharge control switch 18, and the output terminal of the voltage detection circuit (2) 15 is connected to the switch 22.
【０００８】電圧検出回路（１）１４は、いずれかのセ
ルブロックの電圧が例えば４．２５Ｖを越えたときオン
信号を充電制御用スイッチ１７に出力し、いずれかのセ
ルブロックの電圧が２．４Ｖを下回ったときオン信号を
放電制御用スイッチ１８に出力する。充電制御用スイッ
チ１７および放電制御用スイッチ１８は、電圧検出回路
（１）１４からのオン信号により動作して充電器１６お
よび図示しない負荷と電池ブロック１０との接続を遮断
するものである。そして、充電制御用スイッチ１７は、
セルブロックの電圧が所定の電圧より低くなったとき、
放電制御用スイッチ１８はセルブロックの電圧が所定の
電圧より高くなったときそれぞれ遮断を解く復帰型のも
のである。The voltage detection circuit (1) 14 outputs an ON signal to the charge control switch 17 when the voltage of any one of the cell blocks exceeds, for example, 4.25 V, and the voltage of any one of the cell blocks becomes 2. When the voltage falls below 4 V, an ON signal is output to the discharge control switch 18. The charge control switch 17 and the discharge control switch 18 operate in response to an ON signal from the voltage detection circuit (1) 14 to cut off the connection between the battery block 10 and the charger 16 and a load (not shown). And the charge control switch 17 is
When the voltage of the cell block becomes lower than the predetermined voltage,
The discharge control switch 18 is of a return type that releases the cutoff when the voltage of the cell block becomes higher than a predetermined voltage.
【０００９】電圧検出回路（２）１５は、前記の復帰型
安全装置がなんらかの原因で作動せず、電池電圧がさら
に上昇したとき作動する非復帰型の安全装置である。す
なわち、電圧検出回路（２）１５は、電圧検出回路
（１）１４の設定電圧より高い電圧、例えばいずれかの
セルブロックの電圧が４．３５Ｖを越えたときオン信号
をスイッチ２２に出力し、スイッチ２２をオン動作させ
る。スイッチ２２がオン動作すると、電流が発熱素子２
１に流れ、これが発熱し、発熱素子２１に熱的に結合さ
れた温度ヒューズ（１）１９および温度ヒューズ（２）
２０を加熱する。こうして温度ヒューズ（１）１９およ
び温度ヒューズ（２）２０はほぼ同時に溶断する。温度
ヒューズ（１）１９および温度ヒューズ（２）２０が溶
断すれば、電池ブロック１０は、充電器１６から遮断さ
れるばかりでなく、負荷とも遮断されるから、充電も放
電もせず安全が保証される。The voltage detection circuit (2) 15 is a non-return type safety device that does not operate for some reason and does not operate when the battery voltage further increases. That is, the voltage detection circuit (2) 15 outputs an ON signal to the switch 22 when the voltage higher than the set voltage of the voltage detection circuit (1) 14, for example, the voltage of any cell block exceeds 4.35V, The switch 22 is turned on. When the switch 22 is turned on, the current is applied to the heating element 2.
1, which generates heat and is thermally coupled to the heating element 21. The thermal fuse (1) 19 and thermal fuse (2)
Heat 20. Thus, the thermal fuse (1) 19 and the thermal fuse (2) 20 are blown almost simultaneously. If the thermal fuses (1) 19 and the thermal fuses (2) 20 are blown, the battery block 10 is not only disconnected from the charger 16 but also disconnected from the load. You.
【００１０】《実施の形態２》図２は、図１における非
復帰型の安全装置に代わる非復帰型の安全装置の他の構
成例を示している。この例においては、温度ヒューズ
（１）２３が充電器１６と電池ブロック１０との間に接
続され、温度ヒューズ（２）２４は発熱素子２５と直列
に接続されている。そして、温度ヒューズ（２）２４の
溶断温度は温度ヒューズ（１）２３のそれより高く、例
えば２０℃高く設定されている。Embodiment 2 FIG. 2 shows another configuration example of a non-return type safety device which replaces the non-return type safety device in FIG. In this example, the thermal fuse (1) 23 is connected between the charger 16 and the battery block 10, and the thermal fuse (2) 24 is connected in series with the heating element 25. The fusing temperature of the thermal fuse (2) 24 is set higher than that of the thermal fuse (1) 23, for example, 20 ° C. higher.
【００１１】この保護回路は、図１の場合と同様に、復
帰型安全装置がなんらかの原因で作動せず、電池電圧が
さらに上昇したとき作動する非復帰型の安全装置であ
る。すなわち、電圧検出回路１５は、いずれかのセルブ
ロックの電圧が４．３５Ｖを越えたときオン信号をスイ
ッチＳＷに出力し、スイッチＳＷをオン動作させる。ス
イッチＳＷがオン動作すると、電流が発熱素子２５に流
れ、これが発熱し、発熱素子２５に熱的に結合された温
度ヒューズ（１）２３が溶断する。さらに発熱素子２５
の温度が高くなると、温度ヒューズ（２）２４が溶断す
る。この保護回路によると、セルブロックの電圧が異常
に上昇すると、まず温度ヒューズ（１）２３が溶断して
充電器１６からの充電電流を遮断し、若干の時間差をも
って電池ブロック１０を負荷および発熱素子２５から遮
断する。これによって電源装置の安全が保証される。な
お、温度ヒューズの動作温度のバラツキを考慮して、温
度ヒューズ（１）２３が温度ヒューズ（２）２４より必
ず先に動作し、しかも発熱素子２５の異常温度により電
池が不安全なモードになる前に温度ヒューズ（２）２４
を溶断するようにするためには、温度ヒューズ（１）２
３の設定温度を温度ヒューズ（２）２４のそれより２０
℃程度高くするのが好ましい。As in the case of FIG. 1, this protection circuit is a non-recovery type safety device that does not operate for some reason and operates when the battery voltage further increases. That is, when the voltage of any of the cell blocks exceeds 4.35 V, the voltage detection circuit 15 outputs an ON signal to the switch SW to turn on the switch SW. When the switch SW is turned on, a current flows to the heating element 25, which generates heat, and the thermal fuse (1) 23 thermally coupled to the heating element 25 is blown. Further, the heating element 25
Temperature rises, the thermal fuse (2) 24 blows. According to this protection circuit, when the voltage of the cell block rises abnormally, first, the temperature fuse (1) 23 is blown to cut off the charging current from the charger 16, and the battery block 10 is connected to the load and the heating element with a slight time lag. Cut off from 25. This ensures the safety of the power supply. In consideration of the variation in the operating temperature of the thermal fuse, the thermal fuse (1) 23 always operates before the thermal fuse (2) 24, and the battery enters an unsafe mode due to the abnormal temperature of the heating element 25. Before the thermal fuse (2) 24
In order to blow the fuse, the thermal fuse (1) 2
The set temperature of 3 is set to 20 from that of the thermal fuse (2) 24.
It is preferable to raise the temperature by about ° C.
【００１２】[0012]
【発明の効果】以上のように本発明によれば、復帰型の
安全装置が故障するなどにより電池電圧が異常に上昇し
たとき温度ヒューズが溶断し、その後は、一切放電でき
ないようにした安全性の高い二次電池の過充電保護回路
を提供することができる。As described above, according to the present invention, when the battery voltage rises abnormally due to, for example, the failure of the reset type safety device, the thermal fuse is blown, and thereafter, no safety discharge is possible. And an overcharge protection circuit for a secondary battery having a high power consumption can be provided.
【図１】本発明の一実施例における二次電池の過充電保
護回路を示す図である。FIG. 1 is a diagram showing an overcharge protection circuit for a secondary battery in one embodiment of the present invention.
【図２】本発明の他の実施例における二次電池の過充電
保護回路を示す図である。FIG. 2 is a diagram showing an overcharge protection circuit for a secondary battery according to another embodiment of the present invention.
【図３】従来の二次電池の過充電保護回路を示す図であ
る。FIG. 3 is a diagram illustrating a conventional overcharge protection circuit for a secondary battery.
１０ 電池ブロック １１、１２、１３ セルブロック １４、１５ 電圧検出回路 １６ 充電器 １７ 充電制御用スイッチ １８ 放電制御用スイッチ １９、２０、２３、２４ 温度ヒューズ ２１、２５ 発熱素子 ２２ スイッチ DESCRIPTION OF SYMBOLS 10 Battery block 11, 12, 13 Cell block 14, 15 Voltage detection circuit 16 Charger 17 Charge control switch 18 Discharge control switch 19, 20, 23, 24 Thermal fuse 21, 25 Heating element 22 Switch
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０２Ｊ 7/10 Ｈ０２Ｊ 7/10 Ｂ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code Agency reference number FI Technical display location H02J 7/10 H02J 7/10 B
Claims (2)
上になるとオン信号を出力する電圧検出回路、電池と充
電器との間に直列接続した２個の温度ヒューズ、並び
に、前記電圧検出回路のオン信号で動作するスイッチと
前記２個の温度ヒューズに熱的に結合された発熱素子と
が直列に接続され、かつ前記電池と１個の温度ヒューズ
との直列回路及び充電器と他方の温度ヒューズとの直列
回路に並列に接続された回路を具備し、前記電池電圧が
設定値以上になると、電圧検出回路がオン信号を出力し
て前記スイッチをオン動作させ、発熱素子を発熱させて
前記両温度ヒューズを溶断するように構成した二次電池
の過充電保護回路。1. A voltage detection circuit for detecting a battery voltage and outputting an ON signal when the battery voltage exceeds a set value, two thermal fuses connected in series between the battery and a charger, and the voltage detection circuit A switch operated by a circuit ON signal and a heating element thermally coupled to the two thermal fuses are connected in series, and a series circuit of the battery and one thermal fuse and a charger and the other A circuit connected in parallel to a series circuit with the temperature fuse, and when the battery voltage becomes equal to or higher than a set value, a voltage detection circuit outputs an ON signal to turn on the switch, causing the heating element to generate heat. An overcharge protection circuit for a secondary battery configured to blow the two temperature fuses.
上になるとオン信号を出力する電圧検出回路、電池と充
電器との間に挿入された第１の温度ヒューズ、前記電圧
検出回路のオン信号で動作するスイッチと溶断温度が第
１の温度ヒューズのそれより高く設定された第２の温度
ヒューズと前記両温度ヒューズに熱的に結合された発熱
素子とが直列に接続され、前記第１の温度ヒューズと充
電器との直列回路に並列に接続された回路を具備し、前
記電池電圧が設定値以上になると、電圧検出回路がオン
信号を出力して前記スイッチをオン動作させ、発熱素子
を発熱させて第１の温度ヒューズ及び第２の温度ヒュー
ズを順次溶断するように構成した二次電池の過充電保護
回路。2. A voltage detection circuit for detecting a battery voltage and outputting an ON signal when the battery voltage exceeds a set value, a first thermal fuse inserted between the battery and the charger, A switch operated by an ON signal, a second thermal fuse whose fusing temperature is set higher than that of the first thermal fuse, and a heating element thermally coupled to both thermal fuses are connected in series; A circuit connected in parallel to a series circuit of a thermal fuse and a charger, wherein when the battery voltage exceeds a set value, a voltage detection circuit outputs an ON signal to turn on the switch to generate heat. An overcharge protection circuit for a secondary battery, wherein the first thermal fuse and the second thermal fuse are sequentially blown by heating the element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8207193A JPH1056742A (en) | 1996-08-06 | 1996-08-06 | Rechargeable battery overcharge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8207193A JPH1056742A (en) | 1996-08-06 | 1996-08-06 | Rechargeable battery overcharge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1056742A true JPH1056742A (en) | 1998-02-24 |
Family
ID=16535793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8207193A Pending JPH1056742A (en) | 1996-08-06 | 1996-08-06 | Rechargeable battery overcharge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1056742A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6075344A (en) * | 1998-03-02 | 2000-06-13 | Nec Corporation | Secondary-battery protection control |
| GB2349284A (en) * | 1999-04-22 | 2000-10-25 | Aea Technology Plc | Preventing overcharge of lithium cells |
| JP2001325929A (en) * | 2000-05-16 | 2001-11-22 | Uchihashi Estec Co Ltd | Battery protector |
| EP1229339A3 (en) * | 2001-02-03 | 2003-06-18 | VARTA Microbattery GmbH | Method of monitoring the safe operation of rechargeable lithium cells |
| KR100684239B1 (en) * | 1998-08-26 | 2007-02-20 | 소니 가부시끼 가이샤 | Battery Protection Circuits and Electronic Devices |
| JP2007135359A (en) * | 2005-11-11 | 2007-05-31 | Sanyo Electric Co Ltd | Protective element and battery pack equipped therewith |
| JP2008259386A (en) * | 2007-04-09 | 2008-10-23 | Matsushita Electric Ind Co Ltd | Battery protection circuit and battery pack |
| JP2009225632A (en) * | 2008-03-18 | 2009-10-01 | Panasonic Corp | Charging control circuit, battery pack, and charging system |
| US7659692B2 (en) | 2005-11-17 | 2010-02-09 | Panasonic Electric Works Co., Ltd. | Rechargeable battery pack for a power tool having an interruptor for prevention of overcharging |
| JP2011023317A (en) * | 2009-07-21 | 2011-02-03 | Lenovo Singapore Pte Ltd | Protection element and protection system for storage battery |
| JP2012022914A (en) * | 2010-07-15 | 2012-02-02 | Makita Corp | Battery for power tool |
| WO2012101835A1 (en) * | 2011-01-28 | 2012-08-02 | 株式会社イーティーエイコンポーネンツ | Protection device in lithium ion secondary battery |
| JP2015046316A (en) * | 2013-08-28 | 2015-03-12 | デクセリアルズ株式会社 | Shutoff element and shutoff element circuit |
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-
1996
- 1996-08-06 JP JP8207193A patent/JPH1056742A/en active Pending
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|---|---|---|---|---|
| US6075344A (en) * | 1998-03-02 | 2000-06-13 | Nec Corporation | Secondary-battery protection control |
| KR100684239B1 (en) * | 1998-08-26 | 2007-02-20 | 소니 가부시끼 가이샤 | Battery Protection Circuits and Electronic Devices |
| GB2349284A (en) * | 1999-04-22 | 2000-10-25 | Aea Technology Plc | Preventing overcharge of lithium cells |
| JP2001325929A (en) * | 2000-05-16 | 2001-11-22 | Uchihashi Estec Co Ltd | Battery protector |
| EP1229339A3 (en) * | 2001-02-03 | 2003-06-18 | VARTA Microbattery GmbH | Method of monitoring the safe operation of rechargeable lithium cells |
| KR100881817B1 (en) * | 2001-02-03 | 2009-02-03 | 미크로바테리에 게엠베하 | Operation reliability monitoring method of rechargeable lithium battery |
| JP2007135359A (en) * | 2005-11-11 | 2007-05-31 | Sanyo Electric Co Ltd | Protective element and battery pack equipped therewith |
| US7659692B2 (en) | 2005-11-17 | 2010-02-09 | Panasonic Electric Works Co., Ltd. | Rechargeable battery pack for a power tool having an interruptor for prevention of overcharging |
| JP2008259386A (en) * | 2007-04-09 | 2008-10-23 | Matsushita Electric Ind Co Ltd | Battery protection circuit and battery pack |
| JP2009225632A (en) * | 2008-03-18 | 2009-10-01 | Panasonic Corp | Charging control circuit, battery pack, and charging system |
| JP2011023317A (en) * | 2009-07-21 | 2011-02-03 | Lenovo Singapore Pte Ltd | Protection element and protection system for storage battery |
| US8687338B2 (en) | 2009-07-21 | 2014-04-01 | Lenovo (Singapore) Pte. Ltd. | Systems and methods for enhanced protection systems for storage batteries |
| JP2012022914A (en) * | 2010-07-15 | 2012-02-02 | Makita Corp | Battery for power tool |
| WO2012101835A1 (en) * | 2011-01-28 | 2012-08-02 | 株式会社イーティーエイコンポーネンツ | Protection device in lithium ion secondary battery |
| JP2015046316A (en) * | 2013-08-28 | 2015-03-12 | デクセリアルズ株式会社 | Shutoff element and shutoff element circuit |
| CN105493219A (en) * | 2013-08-28 | 2016-04-13 | 迪睿合株式会社 | Cut-off elements and cut-off element circuits |
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| CN110957188A (en) * | 2013-08-28 | 2020-04-03 | 迪睿合株式会社 | Disconnecting element and disconnecting element circuit |
| JP2019528672A (en) * | 2016-08-29 | 2019-10-10 | インテグレーテッド・デバイス・テクノロジー・インコーポレーテッド | Circuits and systems for low power magnetic secure transmission |
| CN110892275A (en) * | 2018-09-30 | 2020-03-17 | Oppo广东移动通信有限公司 | System and method for testing charging device |
| CN110892275B (en) * | 2018-09-30 | 2022-04-01 | Oppo广东移动通信有限公司 | System and method for testing charging device |
| US11368032B2 (en) | 2018-09-30 | 2022-06-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Test system and test method for charging device |
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