JP2008027826A - Battery pack - Google Patents

Battery pack Download PDF

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JP2008027826A
JP2008027826A JP2006201496A JP2006201496A JP2008027826A JP 2008027826 A JP2008027826 A JP 2008027826A JP 2006201496 A JP2006201496 A JP 2006201496A JP 2006201496 A JP2006201496 A JP 2006201496A JP 2008027826 A JP2008027826 A JP 2008027826A
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temperature
protection
current
battery pack
charging
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JP5075372B2 (en
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Toshiyuki Nakatsuji
俊之 仲辻
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To increase charging/discharging currents of a battery pack in which a microcomputer restorably performs protection such as cutting off charging/discharging currents by turning off the FET interposed in the charging/discharging path to a cell unit, if a temperature sensor such as a thermistor senses a temperature in the pack such as cell temperature, to get the result of sensing being a specified threshold temperature or higher. <P>SOLUTION: With the threshold temperature being variable, a setting part 21c sets an optimum threshold temperature at a safe protection control unit 21b according to the current value of charging/discharging when detected by a current detecting resistor 16. So, the current as much as possible can be flown within such range as FETs 12 and 13 perform restorable protection, to respond to the request for increase in charging/discharging currents. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、リチウム二次電池などを用いた電池パックに関する。   The present invention relates to a battery pack using a lithium secondary battery or the like.

上記リチウム二次電池を用いた電池パックは、蓄積できる電荷量が多く、パーソナルコンピュータや携帯電話など、消費電力が大きな機器に好適である。しかしながら、それらの機器では、消費電力が大きなアプリケーションの登場や高機能化などに伴い、放電電流を増大することが望まれている。また、充電時間を短縮するために、充電電流の増大の要望が常にある。   A battery pack using the lithium secondary battery has a large amount of charge that can be stored, and is suitable for a device with high power consumption such as a personal computer or a mobile phone. However, in these devices, it is desired to increase the discharge current with the advent of high power consumption applications and higher functionality. In addition, there is always a demand for an increase in charging current in order to shorten the charging time.

そこで、そのような大電流の充放電を行うにあたって、前記大電流に対する温度保護を行う従来技術として、たとえば特許文献１では、電池パックの温度上昇率が規定値以上であると出力制御スイッチをＯＦＦすることで、電池パック側の保護回路を大幅に削減するようにした充電器が提案されている。   Therefore, as a conventional technique for performing temperature protection for the large current when charging and discharging such a large current, for example, in Patent Document 1, the output control switch is turned off when the rate of temperature increase of the battery pack is a specified value or more. Thus, there has been proposed a charger that greatly reduces the protection circuit on the battery pack side.

また、特許文献２では、充放電経路に介在されたスイッチ素子のうち、放電を制御するスイッチ素子のゲート−ソース間にダイオードを設け、そのダイオードの温度が高くなると逆電流が増加する逆方向特性を利用して温度を検出し、前記スイッチ素子が高温になると、ドライブ回路がそのスイッチ素子をＯＦＦして保護動作を行うことで、ＰＴＣ素子（Positive Temperature Coefficient素子：大電流が流れると抵抗値が急速に大きくなり電流を阻止する素子）等を削減し、安価に温度保護を行うようにした電池パックが提案されている。
特開２００２−３１５２１５号公報 特開２００２−４４８７３号公報 Further, in Patent Document 2, a reverse characteristic in which a diode is provided between the gate and source of a switch element that controls discharge among switch elements interposed in a charge / discharge path, and the reverse current increases as the temperature of the diode increases. When the temperature of the switch element becomes high, the drive circuit turns off the switch element and performs a protection operation, so that the resistance value is increased when a large current flows through the PTC element (Positive Temperature Coefficient element). A battery pack has been proposed in which the number of elements that rapidly increase and block current is reduced, and temperature protection is performed at low cost.
JP 2002-315215 A JP 2002-44873 A

しかしながら、いずれの従来技術においても、一定の閾値温度で保護動作を行っているので、ＦＥＴなどの充放電の電流を制御するスイッチ素子の特性をぎりぎりまで活かし切れているとは言えない。すなわち、前記ＦＥＴは、図３において参照符号α１で示すように、その時の素子の温度に対して通過電流の許容電流値が変化する。したがって、大きな電流で充放電を行えるように前記閾値温度を高目に設定すると、前記ＰＴＣ素子などの保護素子の保護動作が先に働いてしまい、電池パックが使えなくなってしまう。このため、あらゆる条件でも保護動作を実現するためには前記閾値温度を低目に設定しなければならず、大電流化の要望には充分に答えられないという問題がある。   However, in any of the prior arts, since the protective operation is performed at a constant threshold temperature, it cannot be said that the characteristics of the switch element that controls the charge / discharge current of the FET or the like are fully utilized. That is, in the FET, as shown by reference numeral α1 in FIG. 3, the allowable current value of the passing current changes with the temperature of the element at that time. Therefore, if the threshold temperature is set high so that charging / discharging can be performed with a large current, the protective operation of the protective element such as the PTC element works first, and the battery pack cannot be used. For this reason, in order to realize the protective operation under all conditions, the threshold temperature must be set to a low value, and there is a problem that it is not possible to sufficiently respond to the demand for a large current.

本発明の目的は、復旧可能な温度保護動作を行うにあたって、充放電電流の増大の要望に応えることができる電池パックを提供することである。   An object of the present invention is to provide a battery pack capable of meeting the demand for an increase in charge / discharge current when performing a recoverable temperature protection operation.

本発明の電池パックは、パック内の温度を検出する温度検出手段と、前記温度検出手段によって検出された温度が所定の閾値温度以上となると、内蔵電池への給電経路を復旧可能に遮断する保護手段と、前記給電経路を流れる電流値を検出する電流検出手段と、前記電流検出手段の検出結果に応答し、検出された電流値に適応した前記閾値温度を前記保護手段に設定する設定手段とを含むことを特徴とする。   The battery pack according to the present invention includes a temperature detection means for detecting the temperature in the pack, and protection for reversibly cutting off the power supply path to the built-in battery when the temperature detected by the temperature detection means exceeds a predetermined threshold temperature. Means, current detection means for detecting a current value flowing through the power supply path, and setting means for setting the threshold temperature adapted to the detected current value in the protection means in response to a detection result of the current detection means; It is characterized by including.

上記の構成によれば、サーミスタなどの温度検出手段によって、セル温度などのパック内の温度を検出し、その検出結果が所定の閾値温度以上となると、保護手段が、内蔵電池への給電経路に介在されるＦＥＴをＯＦＦして充放電電流を遮断する等の保護動作を復旧可能に行うようにした電池パックにおいて、本発明では前記閾値温度を可変にし、設定手段が、電流検出手段によって検出されたその時の充放電の電流値に応じて最適な閾値温度を前記保護手段に設定する。前記閾値温度は、たとえば指数関数的に変化する前記ＦＥＴの温度に対する許容電流値の特性などに応じて、連続的に変化されてもよく、段階的に変化されてもよい。   According to the above configuration, the temperature in the pack such as the cell temperature is detected by the temperature detection means such as the thermistor, and when the detection result is equal to or higher than the predetermined threshold temperature, the protection means is connected to the power supply path to the built-in battery. In a battery pack in which a protection operation such as shutting off a charging / discharging current by turning off an intervening FET is made recoverable, in the present invention, the threshold temperature is made variable, and the setting means is detected by the current detection means. An optimum threshold temperature is set in the protection means in accordance with the current value of charging / discharging at that time. The threshold temperature may be continuously changed or may be changed stepwise depending on, for example, the characteristics of the allowable current value with respect to the temperature of the FET that changes exponentially.

したがって、前記充放電電流を遮断するＦＥＴ等の保護手段が復旧可能に保護動作を行える範囲で、可能な限りの電流を流すようにすることができ、充放電電流の増大の要望に応えることができる。   Therefore, it is possible to flow as much current as possible within a range in which the protection means such as an FET that cuts off the charging / discharging current can perform the recovering operation in a recoverable manner, and meet the demand for an increase in charging / discharging current. it can.

また、本発明の電池パックでは、前記保護手段は、前記給電経路に介在されるＦＥＴを含み、前記温度検出手段は、前記ＦＥＴの温度を検出し、前記設定手段は、前記ＦＥＴの温度に対する通過電流の許容電流値の特性に応じて前記閾値温度を設定することを特徴とする。   In the battery pack of the present invention, the protection means includes an FET interposed in the power supply path, the temperature detection means detects the temperature of the FET, and the setting means passes through the temperature of the FET. The threshold temperature is set according to the characteristics of the allowable current value of the current.

上記の構成によれば、前記温度検出手段に前記給電経路に介在されるＦＥＴの温度を検出させ、これに対応して前記設定手段は、指数関数的に変化するそのＦＥＴの温度に対する許容電流値の特性に応じて、前記閾値温度を設定する。   According to the above configuration, the temperature detecting unit detects the temperature of the FET interposed in the power supply path, and the setting unit correspondingly corresponds to an allowable current value for the temperature of the FET that changes exponentially. The threshold temperature is set according to the characteristics.

したがって、前記充放電電流を遮断するＦＥＴが復旧可能に保護動作を行える範囲で、可能な限りの電流を流すようにすることができる。   Therefore, it is possible to flow as much current as possible within a range in which the FET that cuts off the charge / discharge current can perform a recoverable protection operation.

さらにまた、本発明の電池パックでは、前記内蔵電池のセル内またはセルブロック内には、復帰型保護素子または非復帰型保護素子を備え、前記温度検出手段は、前記内蔵電池のセル温度を検出し、前記設定手段は、前記保護素子の温度に対する電流値の特性に応じて前記閾値温度を設定することを特徴とする。前記復帰型保護素子としては、バイメタル素子、ＰＴＣ素子が挙げられ、非復帰型保護素子としては、温度ヒューズを挙げることができるが、温度に対する電流値の特性に応じて前記閾値温度を容易に設定できるＰＴＣ素子が好適である。   Furthermore, in the battery pack according to the present invention, the cell or the cell block of the built-in battery is provided with a return type protection element or a non-return type protection element, and the temperature detecting means detects the cell temperature of the built-in battery. The setting means sets the threshold temperature according to a characteristic of a current value with respect to the temperature of the protection element. Examples of the return type protection element include a bimetal element and a PTC element, and examples of the non-return type protection element include a temperature fuse. The threshold temperature is easily set according to the characteristics of the current value with respect to the temperature. PTC elements that can be used are suitable.

上記の構成によれば、本来、外部短絡や異常電流や異常温度に対してはこのＰＴＣ素子などの保護素子が作動してパック内が保護されるべきところ、前記設定手段が指数関数的に変化するＰＴＣ特性などの前記保護素子の温度に対する電流値の特性に応じて、現在の電流値に適した可能な限り高い閾値温度を調整し、前記保護素子による保護動作が掛からない範囲で、保護手段が復旧可能に保護動作を行う。   According to the above configuration, the setting means changes exponentially where protection elements such as the PTC element should be activated to protect the inside of the pack against an external short circuit, abnormal current, or abnormal temperature. In accordance with the characteristics of the current value with respect to the temperature of the protection element, such as the PTC characteristic, the threshold temperature as high as possible suitable for the current current value is adjusted, and the protection means is within a range where the protection operation by the protection element is not applied. The protection action is performed so that it can be recovered.

したがって、前記ＰＴＣ素子などの保護素子による保護動作が掛からない範囲で、可能な限りの電流を流すことができ、異常電流や異常温度で電池パックが使用不能になってしまうことを未然に防止することができる。   Therefore, it is possible to flow as much current as possible within a range where the protective operation such as the PTC element is not applied, and to prevent the battery pack from becoming unusable due to abnormal current or abnormal temperature. be able to.

また、本発明の電池パックでは、前記保護手段および設定手段は、前記内蔵電池への充放電を制御する制御回路に搭載されて保護動作を行い、前記給電経路には温度ヒューズが介在されるとともに、前記制御回路は、前記保護手段を使用した保護動作の失効に対して、異常時の二重保護用に前記温度ヒューズを溶断させることで保護動作を行うことを特徴とする。   In the battery pack of the present invention, the protection means and the setting means are mounted on a control circuit that controls charging / discharging of the built-in battery to perform a protection operation, and a thermal fuse is interposed in the power supply path. The control circuit performs a protection operation by blowing the thermal fuse for double protection at the time of abnormality against the expiration of the protection operation using the protection means.

上記の構成によれば、制御回路の前記保護手段による復旧可能な保護動作に対して、それが失効したときのために、前記給電経路に温度ヒューズが設けられるとともに、そのような異常時の二重保護用に、前記制御回路は、より高い閾値で前記温度ヒューズを溶断させる場合、前記保護手段および設定手段は、その二重保護回路が保護動作を行い、復旧不能になるぎりぎりのレベルまで電流を流すことができ、充放電電流の増大の要望に応えることができる。   According to the above-described configuration, a thermal fuse is provided in the power supply path for when the protection operation that can be restored by the protection means of the control circuit expires. For heavy protection, when the control circuit blows the thermal fuse at a higher threshold, the protection means and the setting means are configured so that the double protection circuit performs a protection operation, and the current is reduced to a level that is impossible to recover. To meet the demand for increased charge / discharge current.

本発明の電池パックは、以上のように、サーミスタなどの温度検出手段によって、セル温度などのパック内の温度を検出し、その検出結果が所定の閾値温度以上となると、保護手段が、内蔵電池への給電経路に介在されるＦＥＴをＯＦＦして充放電電流を遮断する等の保護動作を復旧可能に行うようにした電池パックにおいて、前記閾値温度を可変にし、設定手段が、電流検出手段によって検出されたその時の充放電の電流値に応じて最適な閾値温度を前記保護手段に設定する。   As described above, the battery pack of the present invention detects the temperature in the pack, such as the cell temperature, by the temperature detection means such as the thermistor, and when the detection result exceeds a predetermined threshold temperature, the protection means In the battery pack that is configured to perform the recovery operation such as shutting off the charging / discharging current by turning off the FET interposed in the power supply path to the battery, the threshold temperature is made variable, and the setting means is controlled by the current detection means. An optimum threshold temperature is set in the protection means in accordance with the detected current value of charging / discharging at that time.

それゆえ、前記充放電電流を遮断するＦＥＴ等の保護手段が復旧可能に保護動作を行える範囲で、可能な限りの電流を流すようにすることができ、充放電電流の増大の要望に応えることができる。   Therefore, it is possible to flow as much current as possible within the range where the protection means such as FET that cuts off the charge / discharge current can be restored, and meet the demand for increase of charge / discharge current. Can do.

［実施の形態１］
図１は、本発明の実施の一形態に係る充電システムの電気的構成を示すブロック図である。この充電システムは、電池パック１に、それを充電する充電器２を備えて構成されるが、電池パック１から給電が行われる図示しない負荷機器をさらに含めて電子機器システムが構成されてもよい。その場合、電池パック１は、図１では充電器２から充電が行われるけれども、該電池パック１が前記負荷機器に装着されて、負荷機器を通して充電が行われてもよい。電池パック１および充電器２は、給電を行う直流ハイ側の端子Ｔ１１，Ｔ２１と、通信信号の端子Ｔ１２，Ｔ２２と、給電および通信信号のためのＧＮＤ端子Ｔ１３，Ｔ２３とによって相互に接続される。前記負荷機器が設けられる場合も、同様の端子が設けられる。 [Embodiment 1]
FIG. 1 is a block diagram showing an electrical configuration of a charging system according to an embodiment of the present invention. The charging system includes a battery pack 1 and a charger 2 that charges the battery pack 1. However, an electronic device system may be configured to further include a load device (not shown) that receives power from the battery pack 1. . In that case, although the battery pack 1 is charged from the charger 2 in FIG. 1, the battery pack 1 may be attached to the load device and charged through the load device. The battery pack 1 and the charger 2 are connected to each other by DC high-side terminals T11 and T21 that supply power, communication signal terminals T12 and T22, and GND terminals T13 and T23 for power supply and communication signals. . Similar terminals are also provided when the load device is provided.

前記電池パック１内で、前記の端子Ｔ１１から延びる直流ハイ側の充放電経路１１には、ヒューズ２４，２５が介在されるとともに、充電用と放電用とで相互に導電形式が異なるＦＥＴ１２，１３が介在されており、その充放電経路１１が組電池１４のハイ側端子に接続される。前記組電池１４のロー側端子は、直流ロー側の充放電経路１５を介して前記ＧＮＤ端子Ｔ１３に接続され、この充放電経路１５には、充電電流および放電電流を電圧値に変換する電流検出抵抗１６が介在されている。   In the battery pack 1, the DC high-side charge / discharge path 11 extending from the terminal T11 includes fuses 24 and 25, and FETs 12 and 13 having different conductivity types for charging and discharging. The charge / discharge path 11 is connected to the high-side terminal of the assembled battery 14. A low side terminal of the assembled battery 14 is connected to the GND terminal T13 via a DC low side charging / discharging path 15, and the charging / discharging path 15 has a current detection for converting a charging current and a discharging current into a voltage value. A resistor 16 is interposed.

前記組電池１４は、複数の二次電池のセルが直並列に接続されて成り、各セルの端子間電圧は電圧検出回路２０によって読取られ、マイコン１８内のアナログ／デジタル変換器１９に入力される。また、前記電流検出抵抗１６によって検出された電流値も、前記マイコン１８内のアナログ／デジタル変換器１９に入力される。前記アナログ／デジタル変換器１９は、各入力値をデジタル値に変換して、制御部２１へ出力する。   The assembled battery 14 is formed by connecting a plurality of secondary battery cells in series and parallel, and the voltage between terminals of each cell is read by the voltage detection circuit 20 and input to the analog / digital converter 19 in the microcomputer 18. The The current value detected by the current detection resistor 16 is also input to the analog / digital converter 19 in the microcomputer 18. The analog / digital converter 19 converts each input value into a digital value and outputs the digital value to the control unit 21.

制御部２１は、マイクロプロセッサおよびその周辺回路などを備えて成り、その充放電制御部２１ａは、前記アナログ／デジタル変換器１９からの各入力値に応答して、充電器２に対して、出力を要求する充電電流の電圧値および電流値を演算し、通信部２２から端子Ｔ１２，Ｔ２２；Ｔ１３，Ｔ２３を介して充電器２へ送信する。   The control unit 21 includes a microprocessor and its peripheral circuits, and the charge / discharge control unit 21a outputs to the charger 2 in response to each input value from the analog / digital converter 19. Is calculated and transmitted from the communication unit 22 to the charger 2 via the terminals T12, T22; T13, T23.

また、前記制御部２１の安全保護制御部２１ｂは、前記アナログ／デジタル変換器１９からの各入力値から、端子Ｔ１１，Ｔ１３間の短絡や充電器２からの異常電流などの電池パック１の外部における異常や、組電池１４の異常な温度上昇などに対して、前記ＦＥＴ１２，１３を遮断するなどの保護動作を行う。さらにまた、前記安全保護制御部２１ｂは、セルの異常な過電圧などの深刻な異常時には、前記充放電経路１１に直列に介在され、非復帰型保護素子であるヒューズ２４，２５を溶断する。こうして、セルの過電圧状態に対して、二重の保護系統が設けられていることになる。前記ヒューズ２４，２５の接続点は、発熱抵抗２６およびＦＥＴ２７を介して接地されており、前記安全保護制御部２１ｂがＦＥＴ２７をＯＮすることで、発熱抵抗２６が発生した熱で前記ヒューズ２４，２５が溶断する。   In addition, the safety protection control unit 21b of the control unit 21 detects the external of the battery pack 1 such as a short circuit between the terminals T11 and T13 or an abnormal current from the charger 2 from each input value from the analog / digital converter 19. Protective action such as blocking the FETs 12 and 13 is performed against abnormalities in the above and abnormal temperature rise of the assembled battery 14. Furthermore, the safety protection control unit 21b is interposed in series with the charge / discharge path 11 in the event of a serious abnormality such as an abnormal overvoltage of the cell, and fuses the fuses 24 and 25 that are non-recoverable protection elements. Thus, a double protection system is provided for the overvoltage state of the cell. The connection point of the fuses 24 and 25 is grounded via the heating resistor 26 and the FET 27. When the safety protection control unit 21b turns on the FET 27, the heat generated by the heating resistor 26 causes the fuses 24 and 25 to be turned on. Blows out.

なお、前記電圧検出回路２０の検出結果を取込む二重保護ＩＣを設け、前記電圧検出回路２０の検出結果が予め定める閾値電圧以上となると、前記ＦＥＴ２７をＯＮして前記ヒューズ２４，２５を溶断する別回路を設けることにより、前記制御ＩＣ１８が故障しても、該制御ＩＣ１８と別途に設けられるこの二重保護ＩＣによって、セルの過電圧状態に対する信頼性を、より向上させることができる。   A double protection IC for taking in the detection result of the voltage detection circuit 20 is provided, and when the detection result of the voltage detection circuit 20 exceeds a predetermined threshold voltage, the FET 27 is turned on and the fuses 24 and 25 are blown. By providing such a separate circuit, even if the control IC 18 fails, the double protection IC provided separately from the control IC 18 can further improve the reliability of the cell against the overvoltage state.

前記安全保護制御部２１ｂがＦＥＴ１２，１３を遮断する通常の充放電時における過電圧の閾値電圧は、たとえばセル当り４．３５Ｖであり、安全保護制御部２１ｂがヒューズ２４，２５を溶断する閾値電圧は、たとえばセル当り４．４５Ｖであり、通常使用時の過電圧では復旧可能であり、異常時の過電圧では、電池パック１は再使用不能となって安全性の向上が図られている。   The threshold voltage of overvoltage during normal charging / discharging when the safety protection control unit 21b shuts off the FETs 12 and 13 is, for example, 4.35V per cell, and the threshold voltage at which the safety protection control unit 21b blows the fuses 24 and 25 is For example, the voltage is 4.45 V per cell, and can be restored by an overvoltage during normal use, and the battery pack 1 cannot be reused by an overvoltage at the time of abnormality, thereby improving safety.

そして、前記安全保護制御部２１ｂによってＦＥＴ２７がＯＮされると、発熱抵抗２６で発生された熱で、２つのヒューズ２４，２５は溶断するが、この時、充電状態では、先に組電池１４側のヒューズ２５が溶断しても、充電器２から充電電流が供給されることで、充電器２側のヒューズ２４も後に溶断し、先に充電器２側のヒューズ２４が溶断しても、組電池１４が前記マイコン１８にＦＥＴ２７を駆動する電流を供給できれば組電池１４側のヒューズ２５も溶断することができ、組電池１４が電流を供給できなければ、該組電池１４側のヒューズ２５は溶断しないままとなるが、前記接続点よりも組電池１４側を電池パック１の外部から確実に切り離すことができる。   When the FET 27 is turned on by the safety protection control unit 21b, the two fuses 24 and 25 are blown by the heat generated by the heating resistor 26. At this time, in the charged state, the assembled battery 14 side first. Even if the fuse 25 is blown, the charging current is supplied from the charger 2 so that the fuse 24 on the charger 2 side is also blown later, and the fuse 24 on the charger 2 side is blown first. If the battery 14 can supply the microcomputer 18 with the current for driving the FET 27, the fuse 25 on the assembled battery 14 side can be blown. If the assembled battery 14 cannot supply the current, the fuse 25 on the assembled battery 14 side is blown. However, the battery pack 1 can be reliably separated from the outside of the battery pack 1 from the connection point.

これに対して、電池パック１が充電器２にセットされていない放電状態で、組電池１４が前記マイコン１８にＦＥＴ２７を駆動する電流を供給できれば、先に充電器２側のヒューズ２４が溶断しても、後に組電池１４側のヒューズ２５も溶断し、先に組電池１４側のヒューズ２５が溶断した場合には充電器２側のヒューズ２４は溶断しないままとなるが、前記接続点よりも組電池１４側を電池パック１の外部から確実に切り離すことができる。   On the other hand, if the battery pack 1 is not set in the charger 2 and the assembled battery 14 can supply the microcomputer 18 with a current for driving the FET 27, the fuse 24 on the charger 2 side is blown first. However, if the fuse 25 on the assembled battery 14 side is also blown later, and the fuse 25 on the assembled battery 14 side is blown first, the fuse 24 on the charger 2 side remains unfused, but the point of connection is higher than the connection point. The assembled battery 14 side can be reliably disconnected from the outside of the battery pack 1.

こうして、相互に直列のヒューズ２４，２５を用いて、その接続点を発熱抵抗２６およびＦＥＴ２７によって接地することで、電池パック１が充電器２にセットされているか否かに拘わらず、前記接続点よりも組電池１４側を電池パック１の外部から確実に切り離すことができるようになっている。   In this way, by using the fuses 24 and 25 in series with each other, the connection point is grounded by the heating resistor 26 and the FET 27, so that the connection point is determined regardless of whether or not the battery pack 1 is set in the charger 2. In addition, the assembled battery 14 side can be reliably separated from the outside of the battery pack 1.

一方、充電器２では、充放電制御部２１ａからの前記の要求を制御ＩＣ３０の通信部３２で受信し、充電制御部３１が充電電流供給回路３３を制御して、前記の電圧値および電流値で、充電電流を供給させる。充電電流供給回路３３は、ＡＣ−ＤＣコンバータやＤＣ−ＤＣコンバータなどから成り、入力電圧を、前記充電制御部３１で指示された電圧値、電流値、およびパルス幅に変換して、端子Ｔ２１，Ｔ１１；Ｔ２３，Ｔ１３を介して、充放電経路１１，１６へ供給する。   On the other hand, in the charger 2, the request from the charge / discharge control unit 21 a is received by the communication unit 32 of the control IC 30, and the charge control unit 31 controls the charge current supply circuit 33, so that the voltage value and current value are set. Then, the charging current is supplied. The charging current supply circuit 33 is composed of an AC-DC converter, a DC-DC converter, etc., and converts an input voltage into a voltage value, a current value, and a pulse width instructed by the charging control unit 31, and a terminal T21, T11: Supply to the charge / discharge paths 11 and 16 via T23 and T13.

上述のように構成される充電システムにおいて、注目すべきは、本実施の形態では、前記ＦＥＴ１２，１３に近接して温度センサ１７が設けられており、その検出結果が前記マイコン１８内のアナログ／デジタル変換器１９から安全保護制御部２１ｂに入力されて該安全保護制御部２１ｂが温度保護動作を行うにあたって、その第１の閾値温度が、設定部２１ｃによって、電流検出抵抗１６の検出結果に適応して変化されることである。そして、安全保護制御部２１ｂは、その第１の閾値温度を超えてＦＥＴ１２，１３をＯＦＦ駆動しても、該ＦＥＴ１２，１３のＯＮ故障などで充放電電流が流れ続ける場合には、前記ヒューズ２４，２５を溶断する。前記ＦＥＴ１２，１３を流れる電流の電流値と、ＦＥＴ１２，１３をＯＦＦ駆動する第１の閾値温度との関係は、たとえば表１で示すようであり、前記ヒューズ２４，２５を溶断する第２の閾値温度は、たとえば前記表１から読取られた温度から５℃高い温度とされる。   In the charging system configured as described above, it should be noted that in the present embodiment, a temperature sensor 17 is provided in the vicinity of the FETs 12 and 13, and the detection result is an analog / internal signal in the microcomputer 18. When the safety protection control unit 21b is input to the safety protection control unit 21b from the digital converter 19 and performs the temperature protection operation, the first threshold temperature is adapted to the detection result of the current detection resistor 16 by the setting unit 21c. To be changed. If the charge / discharge current continues to flow due to an ON failure of the FETs 12 and 13 even when the FETs 12 and 13 are driven OFF after exceeding the first threshold temperature, the safety protection control unit 21b causes the fuse 24 , 25 are blown out. The relationship between the current value of the current flowing through the FETs 12 and 13 and the first threshold temperature for driving the FETs 12 and 13 OFF is as shown in Table 1, for example, and the second threshold value for blowing the fuses 24 and 25 is shown in FIG. The temperature is, for example, 5 ° C. higher than the temperature read from Table 1.

Figure 2008027826
Figure 2008027826

図２は、上述のような安全保護制御部２１ｂの動作を説明するためのフローチャートである。この動作は、たとえば２秒毎に行われる。通常の温度保護動作では、ステップＳ１で、安全保護制御部２１ｂはアナログ／デジタル変換器１９の出力から、ＦＥＴ１２，１３を流れる電流の電流値および温度を読込み、ステップＳ２で、その電流値に対応した第１の閾値温度が前記設定部２１ｃによって設定される。ステップＳ３では、温度センサ１７による検出結果が前記第１の閾値温度と比較され、該第１の閾値温度以下であるときにはステップＳ４で前記ＦＥＴ１２，１３のＯＮ状態が継続されて処理を終了する。   FIG. 2 is a flowchart for explaining the operation of the safety protection control unit 21b as described above. This operation is performed, for example, every 2 seconds. In the normal temperature protection operation, in step S1, the safety protection control unit 21b reads the current value and temperature of the current flowing through the FETs 12 and 13 from the output of the analog / digital converter 19, and responds to the current value in step S2. The first threshold temperature is set by the setting unit 21c. In step S3, the detection result by the temperature sensor 17 is compared with the first threshold temperature. When the detection result is equal to or lower than the first threshold temperature, the ON state of the FETs 12 and 13 is continued in step S4 and the process is terminated.

一方、前記ステップＳ３で、ＦＥＴ１２，１３の温度が前記第１の閾値温度を超えていると判断されるとステップＳ５に移り、前記安全保護制御部２１ｂはＦＥＴ１２，１３をＯＦＦ駆動する。このとき、ＦＥＴ１２，１３に対して温度センサ１７が個別に設けられている場合には、各ＦＥＴ１２，１３が個別にＯＦＦ駆動されてもよい。そして、そのステップＳ５での保護動作の後、ステップＳ６ではＦＥＴ１２，１３の温度が前記第２の閾値温度と比較され、該第２の閾値温度以上となっている、すなわちＦＥＴ１２，１３をＯＦＦ駆動する通常の温度保護動作で異常が解消しなかった場合には、前記安全保護制御部２１ｂは、ステップＳ７でヒューズ２４，２５を溶断する二重保護動作を行った後、処理を終了する。これに対して、ステップＳ６でＦＥＴ１２，１３の温度が前記第２の閾値温度未満である場合には、そのまま処理を終了する。   On the other hand, if it is determined in step S3 that the temperature of the FETs 12 and 13 exceeds the first threshold temperature, the process proceeds to step S5, and the safety protection control unit 21b drives the FETs 12 and 13 OFF. At this time, when the temperature sensors 17 are individually provided for the FETs 12 and 13, the FETs 12 and 13 may be individually turned off. After the protective operation in step S5, the temperature of the FETs 12 and 13 is compared with the second threshold temperature in step S6 and is equal to or higher than the second threshold temperature, that is, the FETs 12 and 13 are driven OFF. If the abnormality is not solved by the normal temperature protection operation, the safety protection control unit 21b performs the double protection operation of blowing the fuses 24 and 25 in step S7, and then ends the process. On the other hand, if the temperature of the FETs 12 and 13 is lower than the second threshold temperature in step S6, the process is terminated as it is.

なお、前記ステップＳ５で第１の閾値温度を超えたために復帰可能な保護動作が行われたこと、およびステップＳ７で第２の閾値温度以上のために復帰不能な二重保護動作が行われたことを、充電時には充電器２へ、放電時には負荷機器３へ、通信部２２を介して通知することで、ユーザは、何故電池パック１が使用不能になったのかを認識することができる。   It should be noted that a protection operation that can be restored because the first threshold temperature was exceeded in step S5 was performed, and a double protection operation that could not be restored because the temperature was higher than the second threshold temperature was performed in step S7. This is notified to the charger 2 at the time of charging and to the load device 3 at the time of discharging through the communication unit 22 so that the user can recognize why the battery pack 1 has become unusable.

このように構成することで、温度センサ１７によってパック内の温度を検出し、安全保護制御部２１ｂがその検出結果に基づいてＦＥＴ１２，１３をＯＦＦ駆動する温度保護動作を行うにあたって、設定部２１ｃによって前記ＦＥＴ１２，１３を流れる電流の許容電流値特性に応じて前記第１の閾値温度を設定するので、前記図３において参照符号α１で示すように、その時の素子の温度に対して指数関数的に通過電流の許容電流値が変化しても、前記第１の閾値温度を、参照符号α２で示すように適切に追従して設定することができる。これによって、ＦＥＴ１２，１３が復旧可能に保護動作を行える範囲で、可能な限りの電流を流すようにすることができ、充放電電流の増大の要望に応えることができる。   With this configuration, the temperature sensor 17 detects the temperature in the pack, and the safety protection control unit 21b performs the temperature protection operation for driving the FETs 12 and 13 OFF based on the detection result. Since the first threshold temperature is set according to the allowable current value characteristic of the current flowing through the FETs 12 and 13, as indicated by the reference symbol α1 in FIG. Even if the allowable current value of the passing current changes, the first threshold temperature can be set appropriately following the reference value α2. As a result, it is possible to flow as much current as possible within a range in which the FETs 12 and 13 can perform the protective operation in a recoverable manner, and it is possible to meet the demand for an increase in charge / discharge current.

また、安全保護制御部２１ｂおよび設定部２１ｃを、組電池１４への充放電を制御する充放電制御部２１ａと共にマイコン１８に搭載し、前記第１の閾値温度による温度保護動作を行わせる一方、前記マイコン１８による前記ＦＥＴ１２，１３を使用した保護動作の失効に対して、異常時の二重保護用に前記充放電経路１１にヒューズ２４，２５を設け、前記第１の閾値温度よりも高い第２の閾値温度で保護動作を行い、復旧不能になってしまうぎりぎりのレベルまで電流を流すことで、充放電電流の増大の要望に応えることができる。   In addition, the safety protection control unit 21b and the setting unit 21c are mounted on the microcomputer 18 together with the charge / discharge control unit 21a that controls charging / discharging of the assembled battery 14, and the temperature protection operation based on the first threshold temperature is performed. Fuse 24 and 25 are provided in the charging / discharging path 11 for double protection at the time of anomaly against the expiration of the protection operation using the FETs 12 and 13 by the microcomputer 18, and a temperature higher than the first threshold temperature is provided. The protection operation is performed at the threshold temperature of 2, and the current is allowed to flow to a level that is impossible to recover, so that the demand for an increase in charge / discharge current can be met.

前記第１の閾値温度は、指数関数的に変化する前記ＦＥＴの温度に対する許容電流値の特性に応じて、前記参照符号α２で示すように段階的に変化されてもよく、テーブルデータや近似演算などの負担が問題にならなければ、前記参照符号α１で示す指数関数の曲線に沿って連続的に変化されてもよい。すなわち、図３において、これら参照符号α１，α２で示す線間の斜線を施して示す領域が、誤動作防止のための不感帯となり、これら参照符号α１，α２で示す線の最近接点が近い程、誤動作の可能性が高くなり、斜線の面積が狭くなる程、多くの電流を流すことができる。したがって、斜線の面積が狭くなるように、かつ最近接点の間隔を離すためには、参照符号α２で示す第１の閾値温度を、参照符号α１で示す許容電流値の特性と平行にすることが望ましい。   The first threshold temperature may be changed in a stepwise manner as indicated by the reference symbol α2 in accordance with the characteristics of the allowable current value with respect to the temperature of the FET that changes exponentially. If such a burden is not a problem, it may be changed continuously along the exponential function curve indicated by the reference symbol α1. That is, in FIG. 3, the hatched area between the lines indicated by the reference characters α1 and α2 is a dead zone for preventing malfunction, and the closer the closest point of the lines indicated by the reference characters α1 and α2 is, the more the malfunction occurs. The higher the possibility, the smaller the hatched area, the more current can flow. Therefore, in order to reduce the area of the hatched line and increase the distance between the closest points, the first threshold temperature indicated by the reference symbol α2 should be parallel to the characteristics of the allowable current value indicated by the reference symbol α1. desirable.

また、第１の閾値温度を変化する際には、前回の変化方向と同じ（順）方向の変化に対して、逆（戻る）方向の変化がし難くなるヒステリシスを設定することが望ましい。これによって、前記第１の閾値温度の不所望なハンチングを防止することができる。   Further, when changing the first threshold temperature, it is desirable to set a hysteresis that makes it difficult to change in the reverse (return) direction with respect to the change in the same (forward) direction as the previous change direction. Thereby, undesired hunting of the first threshold temperature can be prevented.

［実施の形態２］
図４は、本発明の実施の他の形態に係る充電システムの電気的構成を示すブロック図である。この充電システムは、前述の図１で示す充電システムに類似し、対応する部分には同一の参照符号を付して示し、その説明を省略する。充電器２は、前述の充電システムと同一である。前述の電池パック１では、温度センサ１７はＦＥＴ１２，１３に近接して設けられており、設定部２１ｃがＦＥＴ１２，１３の許容電流値の特性に応じて前記第１の閾値温度を設定していたのに対して、注目すべきは、本実施の形態の電池パック１’では、前記温度センサ１７を組電池１４に近接して設け、マイコン１８’の制御部２１’では、設定部２１ｃ’における前記第１の閾値温度を、セル内のＰＴＣ特性に応じて設定することである。ＰＴＣ素子は、組電池１４のセル内またはセルブロック内に設けられる復帰可能な保護素子で、高温で動作すると高抵抗になり、電流を抑え、電流が下がることで温度が低下してくれば、再度低抵抗状態になり、復帰する。但し、瞬時に復帰しないものもある。 [Embodiment 2]
FIG. 4 is a block diagram showing an electrical configuration of a charging system according to another embodiment of the present invention. This charging system is similar to the charging system shown in FIG. 1 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted. The charger 2 is the same as the above-described charging system. In the battery pack 1 described above, the temperature sensor 17 is provided close to the FETs 12 and 13, and the setting unit 21c sets the first threshold temperature according to the characteristics of the allowable current value of the FETs 12 and 13. On the other hand, it should be noted that in the battery pack 1 ′ of the present embodiment, the temperature sensor 17 is provided in the vicinity of the assembled battery 14, and the control unit 21 ′ of the microcomputer 18 ′ includes the setting unit 21 c ′. The first threshold temperature is set according to the PTC characteristic in the cell. A PTC element is a reversible protective element provided in a cell or a cell block of the assembled battery 14. When the PTC element operates at a high temperature, the resistance becomes high, the current is suppressed, and the current is decreased to decrease the temperature. It becomes a low resistance state again and returns. However, there are some that do not return instantly.

この場合にＦＥＴ１２，１３をＯＦＦ駆動する第１の閾値温度と、セルを流れる充放電電流との関係は、たとえば表２で示すようであり、前記ヒューズ２４，２５を溶断する第２の閾値温度は、たとえば８５℃に設定される。   In this case, the relationship between the first threshold temperature for driving the FETs 12 and 13 OFF and the charge / discharge current flowing through the cell is as shown in Table 2, for example, and the second threshold temperature for blowing the fuses 24 and 25 is shown in FIG. Is set to 85 ° C., for example.

Figure 2008027826
Figure 2008027826

このように構成することで、本来、異常電流や異常温度に対してはこのＰＴＣ素子が作動してパック内が保護されるべきところ、温度センサ１７によってパック内の温度を検出し、安全保護制御部２１ｂ’がその検出結果に基づいてＦＥＴ１２，１３をＯＦＦ駆動することで、ＰＴＣ素子が作動する前の段階で復旧可能な温度保護動作を行うことができる。また、設定部２１ｃ’によってセル内のＰＴＣ素子の温度に対する電流値の特性に応じて前記第１の閾値温度を設定するので、図５において参照符号β１で示すように、その時のセルの温度に対して指数関数的に電流が絞られても、前記第１の閾値温度を、参照符号β２で示すように適切に追従して設定することができる。これによって、前記ＰＴＣ素子による保護動作が掛からない範囲で、可能な限りの電流を流すことができ、前記異常電流や異常温度で電池パックが使用不能になってしまうことを未然に防止することができる。   With this configuration, the PTC element should normally be activated against abnormal current and abnormal temperature to protect the inside of the pack. However, the temperature in the pack is detected by the temperature sensor 17, and safety protection control is performed. The unit 21b ′ drives the FETs 12 and 13 OFF based on the detection result, so that a temperature protection operation that can be recovered at a stage before the PTC element is activated can be performed. Further, since the first threshold temperature is set by the setting unit 21c ′ in accordance with the characteristic of the current value with respect to the temperature of the PTC element in the cell, the cell temperature at that time is set as indicated by reference numeral β1 in FIG. On the other hand, even if the current is restricted exponentially, the first threshold temperature can be set appropriately following the reference temperature β2. As a result, it is possible to flow as much current as possible within a range in which the protection operation by the PTC element is not applied, and to prevent the battery pack from becoming unusable due to the abnormal current or abnormal temperature. it can.

本発明の電池パックは、サーミスタなどの温度センサ１７によって、セル温度などのパック内の温度を検出し、その検出結果が所定の閾値温度以上となると、マイコン１８内の安全保護制御部２１ｂが、組電池１４への充放電経路１１に介在されるＦＥＴ１２，１３をＯＦＦして充放電電流を遮断する等の保護動作を復旧可能に行うようにした電池パックにおいて、前記閾値温度を可変にし、設定部２１ｃが、電流検出抵抗１６によって検出されたその時の充放電の電流値に応じて最適な閾値温度を前記安全保護制御部２１ｂに設定するので、ＦＥＴ１２，１３が復旧可能に保護動作を行える範囲で、可能な限りの電流を流すようにすることができ、近年の大きな充放電電流の要求される電池パックに好適である。   The battery pack of the present invention detects the temperature in the pack such as the cell temperature by the temperature sensor 17 such as a thermistor, and when the detection result is equal to or higher than a predetermined threshold temperature, the safety protection control unit 21b in the microcomputer 18 In the battery pack in which the FETs 12 and 13 interposed in the charging / discharging path 11 to the assembled battery 14 are turned off to cut off the charging / discharging current, the threshold temperature is made variable and set. Since the unit 21c sets the optimum threshold temperature in the safety protection control unit 21b according to the current value of the charge / discharge detected by the current detection resistor 16, the range in which the FETs 12 and 13 can perform the protective operation in a recoverable manner Thus, it is possible to flow as much current as possible, which is suitable for a battery pack that requires a large charge / discharge current in recent years.

本発明の実施の一形態に係る充電システムの電気的構成を示すブロック図である。It is a block diagram which shows the electric constitution of the charging system which concerns on one Embodiment of this invention. 上記の充電システムにおける電池パック内の安全保護制御部の動作を説明するためのフローチャートである。It is a flowchart for demonstrating operation | movement of the safety protection control part in the battery pack in said charging system. 図１で示す充電システムにおける充放電電流を制御するＦＥＴの許容電流値の温度に対する変化およびそれに適応した異常検出の閾値温度の変化を説明するためのグラフである。2 is a graph for explaining a change in an allowable current value of an FET for controlling a charge / discharge current in the charging system shown in FIG. 1 with respect to a temperature and a change in a threshold temperature for abnormality detection adapted thereto. 本発明の実施の他の形態に係る充電システムの電気的構成を示すブロック図である。It is a block diagram which shows the electric constitution of the charging system which concerns on other embodiment of this invention. 図４で示す充電システムにおけるＰＴＣ特性とそれに適応した異常検出の閾値温度の変化を説明するためのグラフである。FIG. 5 is a graph for explaining a change in the PTC characteristic in the charging system shown in FIG. 4 and an abnormality detection threshold temperature adapted thereto. FIG.

符号の説明Explanation of symbols

１，１’ 電池パック
２ 充電器
１１，１５ 充放電経路（給電経路）
１２，１３ ＦＥＴ（保護手段）
１４ 組電池（内蔵電池）
１６ 電流検出抵抗（電流検出手段）
１７ 温度センサ（温度検出手段）
１８，１８’ マイコン（制御回路）
１９ アナログ／デジタル変換器
２０ 電圧検出回路
２１，２１’ 制御部
２１ａ 充放電制御部
２１ｂ，２１ｂ’ 安全保護制御部（保護手段）
２１ｃ，２１ｃ’ 設定部（設定手段）
２２，３２ 通信部
２４，２５ ヒューズ
２６ 発熱抵抗
２７ ＦＥＴ
３０ 制御ＩＣ
３１ 充電制御部
３３ 充電電流供給回路
Ｔ１１，Ｔ２１；Ｔ１２，Ｔ２２；Ｔ１３，Ｔ２３；Ｔ１４，Ｔ２４ 端子 1,1 'battery pack 2 charger 11, 15 charge / discharge path (power supply path)
12, 13 FET (protection means)
14 Battery pack (built-in battery)
16 Current detection resistor (current detection means)
17 Temperature sensor (temperature detection means)
18, 18 'microcomputer (control circuit)
19 Analog / digital converter 20 Voltage detection circuit 21, 21 ′ Control unit 21 a Charge / discharge control unit 21 b, 21 b ′ Safety protection control unit (protection means)
21c, 21c ′ setting section (setting means)
22, 32 Communication unit 24, 25 Fuse 26 Heating resistor 27 FET
30 Control IC
31 charging control unit 33 charging current supply circuit T11, T21; T12, T22; T13, T23; T14, T24 terminals

Claims (4)

電池パックにおいて、
パック内の温度を検出する温度検出手段と、
前記温度検出手段によって検出された温度が所定の閾値温度以上となると、内蔵電池への給電経路を復旧可能に遮断する保護手段と、
前記給電経路を流れる電流値を検出する電流検出手段と、
前記電流検出手段の検出結果に応答し、検出された電流値に適応した前記閾値温度を前記保護手段に設定する設定手段とを含むことを特徴とする電池パック。 In the battery pack,
Temperature detecting means for detecting the temperature in the pack;
When the temperature detected by the temperature detection means is equal to or higher than a predetermined threshold temperature, protection means for reversibly cutting off the power supply path to the built-in battery;
Current detection means for detecting a current value flowing through the power supply path;
A battery pack comprising: a setting unit configured to set the threshold temperature suitable for the detected current value in the protection unit in response to a detection result of the current detection unit. 前記保護手段は、前記給電経路に介在されるＦＥＴを含み、
前記温度検出手段は、前記ＦＥＴの温度を検出し、
前記設定手段は、前記ＦＥＴの温度に対する通過電流の許容電流値の特性に応じて前記閾値温度を設定することを特徴とする請求項１記載の電池パック。 The protection means includes an FET interposed in the power supply path,
The temperature detection means detects the temperature of the FET,
The battery pack according to claim 1, wherein the setting unit sets the threshold temperature according to a characteristic of an allowable current value of a passing current with respect to a temperature of the FET. 前記内蔵電池のセル内またはセルブロック内には、復帰型保護素子または非復帰型保護素子を備え、
前記温度検出手段は、前記内蔵電池のセル温度を検出し、
前記設定手段は、前記保護素子の温度に対する電流値の特性に応じて前記閾値温度を設定することを特徴とする請求項１記載の電池パック。 In the cell or cell block of the built-in battery, a return protection element or a non-return protection element is provided,
The temperature detecting means detects a cell temperature of the built-in battery,
The battery pack according to claim 1, wherein the setting unit sets the threshold temperature according to a characteristic of a current value with respect to a temperature of the protection element. 前記保護手段および設定手段は、前記内蔵電池への充放電を制御する制御回路に搭載されて保護動作を行い、
前記給電経路には温度ヒューズが介在されるとともに、前記制御回路は、前記保護手段を使用した保護動作の失効に対して、異常時の二重保護用に前記温度ヒューズを溶断させることで保護動作を行うことを特徴とする請求項１〜３のいずれか１項に記載の電池パック。 The protection means and the setting means are mounted on a control circuit that controls charging / discharging to the built-in battery and perform a protection operation,
A thermal fuse is interposed in the power supply path, and the control circuit protects against invalidation of the protective operation using the protective means by blowing the thermal fuse for double protection at the time of abnormality. The battery pack according to claim 1, wherein the battery pack is performed.
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