JP4660497B2 - Battery pack monitoring and protection device - Google Patents

Battery pack monitoring and protection device Download PDF

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JP4660497B2
JP4660497B2 JP2007059524A JP2007059524A JP4660497B2 JP 4660497 B2 JP4660497 B2 JP 4660497B2 JP 2007059524 A JP2007059524 A JP 2007059524A JP 2007059524 A JP2007059524 A JP 2007059524A JP 4660497 B2 JP4660497 B2 JP 4660497B2
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昌幸 星野
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E60/10—Energy storage using batteries

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Description

本発明は、複数個のセルが直列接続されたバッテリパックを監視保護するバッテリパックの監視保護装置に関する。   The present invention relates to a battery pack monitoring and protection device for monitoring and protecting a battery pack in which a plurality of cells are connected in series.

例えば、リチウムイオン二次電池のバッテリパックにおいては、過充電や過放電からリチウムイオン二次電池を保護するため、セル電圧を計測して監視保護を行っている。また、各セル電圧を計測するための電圧計測線が断線した場合には、リチウム二次電池を保護することができないので、電圧計測線の断線の監視も行っている。   For example, in a battery pack of a lithium ion secondary battery, in order to protect the lithium ion secondary battery from overcharge and overdischarge, cell voltage is measured and monitoring protection is performed. Moreover, since the lithium secondary battery cannot be protected when the voltage measurement line for measuring each cell voltage is disconnected, the disconnection of the voltage measurement line is also monitored.

電圧測定線を介して二次電池の出力電圧が入力される複数の電圧入力端子間に複数の電圧センサを接続するとともに、電圧測定線が非断線状態の時には接続された電圧入力端子に対して所定の電流を供給する複数の定電流源をそれぞれ電圧入力端子に接続し、二次電池の電圧計測線の断線を監視するようにしたものがある（例えば、特許文献１参照）。また、電圧計測線の断線を監視するものとして１セル毎の放電回路を用いて検出するもの（例えば、特許文献２参照）や、セル短絡回路のインピーダンスを変えてインピーダンス測定を行うようにしたものがある（例えば、特許文献３参照）。
特開２００６−２７５９２８号公報 特開２００５−１６８１１８号公報 特開２００６―５０７８４号公報 Connect multiple voltage sensors between multiple voltage input terminals to which the output voltage of the secondary battery is input via the voltage measurement line, and connect to the connected voltage input terminal when the voltage measurement line is not disconnected. There is one in which a plurality of constant current sources that supply a predetermined current are connected to voltage input terminals, respectively, and the disconnection of the voltage measurement line of the secondary battery is monitored (for example, see Patent Document 1). In addition, it is possible to monitor the disconnection of the voltage measurement line using a discharge circuit for each cell (for example, refer to Patent Document 2), or to change the impedance of the cell short circuit to perform impedance measurement. (For example, refer to Patent Document 3).
JP 2006-275928 A JP 2005-168118 A JP 2006-50784 A

しかし、特許文献１〜３に示される電圧計測線の断線検出方法においては、電圧計測線の断線を検出するためのステップが必要であり、このステップの間において、各セル電圧の計測ができない。このため、急速に充電や放電が行われてセルの電圧が急激に変化するときには、保護動作が遅れるという課題があった。   However, in the voltage measurement line disconnection detection method disclosed in Patent Documents 1 to 3, a step for detecting disconnection of the voltage measurement line is required, and during this step, the voltage of each cell cannot be measured. For this reason, there has been a problem that the protection operation is delayed when the cell voltage changes rapidly due to rapid charging and discharging.

本発明の目的は、断線検出のための追加のステップを必要としないで断線検出ができるバッテリパックの監視保護装置を得ることである。   An object of the present invention is to provide a battery pack monitoring and protection device that can detect disconnection without requiring an additional step for disconnection detection.

本発明のバッテリパックの監視保護装置は、複数個のセルが直列接続されたバッテリパックの電圧計測線に各々のセルのプラス端子とマイナス端子とに接続される切替スイッチを設け、１セル分の出力電圧は前記切替スイッチで１セルのプラス端子とマイナス端子とを接続して計測し、２セル分の出力電圧は前記切替スイッチで直列接続された２セルの一方のセルのプラス端子と他方のセルのマイナス端子とを接続して計測し、前記切替スイッチにより１セル分の出力電圧と２セル分の出力電圧とを交互に計測する計測部と、前記計測部で計測された１セル分の出力電圧または２セル分の出力電圧が所定範囲を逸脱したときはバッテリパックの保護動作を行い正常範囲に戻ったときは保護動作を解除する保護動作部とを備え、前記保護動作部は、２セル分の電圧計測で１セル分の正常範囲の電圧が計測された場合、または１セル分の電圧計測で２セル分の正常範囲の電圧が計測された場合には、電圧計測線に断線があると判断することを特徴とする。
According to the battery pack monitoring and protection apparatus of the present invention, a voltage measuring line of a battery pack in which a plurality of cells are connected in series is provided with a changeover switch connected to the plus terminal and the minus terminal of each cell. The output voltage is measured by connecting the positive terminal and the negative terminal of one cell with the changeover switch, and the output voltage for two cells is the positive terminal and the other of two cells connected in series with the changeover switch. Measurement is performed by connecting the negative terminal of the cell and measuring the output voltage for one cell and the output voltage for two cells alternately by the changeover switch, and for one cell measured by the measurement unit. Bei example a protection operation unit for releasing the protective action when it returns to the normal range performs the protection operation of the battery pack when the output voltage of the output voltage or two cells deviates a predetermined range, the protection operation unit When a voltage in the normal range for one cell is measured by voltage measurement for two cells, or when a voltage in the normal range for two cells is measured by voltage measurement for one cell, the voltage measurement line It is characterized by determining that there is a disconnection .

本発明によれば、断線検出のための追加のステップを必要としないで断線検出ができるので、急速に充電や放電が行われてセルの電圧が急激に変化するときであっても保護動作が遅れることがないバッテリパックの監視保護装置を提供できる。   According to the present invention, since it is possible to detect disconnection without requiring an additional step for detecting disconnection, even if the voltage of the cell changes rapidly due to rapid charging or discharging, the protective operation can be performed. It is possible to provide a monitoring and protection device for a battery pack that is not delayed.

図１は本発明の実施の形態に係わるバッテリパックの監視保護装置の構成図である。バッテリパック１１は、複数個のセルBatt1〜Battnが直列接続されて構成され、各々のセルBatt1〜Battnから電圧計測線１２が引き出され計測部１３に接続されている。計測部１３は、各々のセルBatt1〜Battnのプラス端子側に接続される切替スイッチS11H〜S1nHと、各々のセルBatt1〜Battnのマイナス端子側に接続される切替スイッチS11L〜S1nLとを有し、並列接続された切替スイッチS11H〜S1nHと並列接続された切替スイッチS11L〜S1nLとの間にコンデンサＣが接続されている。このコンデンサＣには、切替スイッチS11H〜S1nH及び切替スイッチS11L〜S1nLの切り替えにより、１セル分の出力電圧または２セル分の出力電圧が印加される。   FIG. 1 is a configuration diagram of a battery pack monitoring and protection apparatus according to an embodiment of the present invention. The battery pack 11 is configured by connecting a plurality of cells Batt1 to Battn in series, and a voltage measurement line 12 is drawn from each of the cells Batt1 to Battn and connected to the measurement unit 13. The measurement unit 13 includes changeover switches S11H to S1nH connected to the positive terminals of the cells Batt1 to Battn, and changeover switches S11L to S1nL connected to the negative terminals of the cells Batt1 to Battn. A capacitor C is connected between the changeover switches S11H to S1nH connected in parallel and the changeover switches S11L to S1nL connected in parallel. An output voltage for one cell or an output voltage for two cells is applied to the capacitor C by switching the changeover switches S11H to S1nH and the changeover switches S11L to S1nL.

また、計測部１３の出力側には、並列接続された切替スイッチS11H〜S1nHに接続される出力側切替スイッチS21H、S22Hと、並列接続された切替スイッチS11L〜S1nLに接続されるS21L、S22Lとが設けられている。そして、コンデンサＣにチャージされた電荷量に基づいて１セル分または２セル分が過充放電状態であるか否かを測定し、１セル分が過放電状態であるときは演算増幅器１４ｄ１から１セル分の過放電検出信号Od1が保護操作部１５に出力され、１セル分が過充電状態であるときは演算増幅器１４ｃ１から１セル分の過充電検出信号Oc1が保護操作部１５に出力される。同様に、２セル分が過放電状態であるときは演算増幅器１４ｄ２から２セル分の過放電検出信号Od2が保護操作部１５に出力され、２セル分が過充電状態であるときは演算増幅器１４ｃ２から２セル分の過充電検出信号Oc2が保護操作部１５に出力される。   Further, on the output side of the measurement unit 13, output-side change-over switches S21H and S22H connected to the change-over switches S11H to S1nH connected in parallel, and S21L and S22L connected to the change-over switches S11L to S1nL connected in parallel, Is provided. Then, based on the amount of charge charged in the capacitor C, it is determined whether or not one cell or two cells are in the overcharge / discharge state. When one cell is in the overdischarge state, the operational amplifiers 14d1 to 1 An overdischarge detection signal Od1 for one cell is output to the protection operation unit 15, and when one cell is in an overcharged state, an overcharge detection signal Oc1 for one cell is output to the protection operation unit 15 from the operational amplifier 14c1. . Similarly, when two cells are in an overdischarged state, an overdischarge detection signal Od2 for two cells is output from the operational amplifier 14d2 to the protection operation unit 15, and when two cells are in an overcharged state, the operational amplifier 14c2 is output. To 2 cells, an overcharge detection signal Oc2 for two cells is output to the protection operation unit 15.

保護操作部１５は、過放電検出信号Od1、過充電検出信号Oc1、過放電検出信号Od2、過充電検出信号Oc2に基づいて、バッテリパック１１の監視保護動作を行う。また、各々のセルBatt1〜Battnから電圧計測線１２のいずれかが断線していると判断したときは、警報出力装置１６に対し、その旨を警報出力する。警報出力装置１６は表示器１７及び音声出力装置１８を有しており、これらのいずれか一方または双方に電圧計測線１２が断線していることを報知出力する。   The protection operation unit 15 performs a monitoring protection operation of the battery pack 11 based on the overdischarge detection signal Od1, the overcharge detection signal Oc1, the overdischarge detection signal Od2, and the overcharge detection signal Oc2. When it is determined that any one of the voltage measurement lines 12 is disconnected from each of the cells Batt1 to Battn, an alarm is output to the alarm output device 16. The alarm output device 16 has a display 17 and an audio output device 18, and outputs a notification that the voltage measurement line 12 is disconnected to one or both of them.

ここで、計測部１３においては、切替スイッチS11H〜S1nHと切替スイッチS11L〜S1nLとを切り替えて、１セル分の出力電圧と２セル分の出力電圧とを交互に計測する。まず、１セル分の出力電圧の計測について説明する。切替スイッチS11L、S11Hを閉じ、セルBatt1の出力電圧をコンデンサＣに印加してコンデンサＣに電荷を充電させる。その後に、それぞれの切替スイッチS11L、S11Hを開き、出力側切替スイッチS21L、S21Hを閉じてセルBatt1（１セル分）の電圧を計測する。このときに計測された電圧によって、図２に示す保護動作を行う。   Here, the measurement unit 13 switches the changeover switches S11H to S1nH and the changeover switches S11L to S1nL to alternately measure the output voltage for one cell and the output voltage for two cells. First, measurement of the output voltage for one cell will be described. The change-over switches S11L and S11H are closed, and the output voltage of the cell Batt1 is applied to the capacitor C so that the capacitor C is charged. Thereafter, the respective change-over switches S11L and S11H are opened, the output-side change-over switches S21L and S21H are closed, and the voltage of the cell Batt1 (for one cell) is measured. The protection operation shown in FIG. 2 is performed by the voltage measured at this time.

計測電圧が１セル分の放電保護電圧を超え１セル分の充電保護電圧未満であるときは、Batt1（１セル分）の電圧は正常範囲である。従って、演算増幅器１４ｄ１からの１セル分の過放電検出信号Od1、演算増幅器１４ｃ１からの１セル分の過充電検出信号Oc1は保護操作部１５に出力されず、保護動作部１５による保護動作は行われない。   When the measured voltage exceeds the discharge protection voltage for one cell and is less than the charge protection voltage for one cell, the voltage of Batt1 (for one cell) is in the normal range. Accordingly, the overdischarge detection signal Od1 for one cell from the operational amplifier 14d1 and the overcharge detection signal Oc1 for one cell from the operational amplifier 14c1 are not output to the protection operation unit 15, and the protection operation by the protection operation unit 15 is performed. I will not.

次に、計測電圧が１セル分の充電保護電圧以上で２セル分の放電保護電圧以下である場合は、充電保護動作として充電を遮断する。そして、計測電圧が１セル分の充電保護電圧より小さい予め定めた特定電圧より小さくなったときは、充電保護動作を解除し充電が行える状態とする。また、計測電圧が１セル分の放電保護電圧以下であるときは、放電保護動作として放電を遮断する。そして、計測電圧が１セル分の放電保護電圧より大きい予め定めた特定電圧より大きくなったときは、放電保護動作を解除し放電が行える状態とする。   Next, when the measured voltage is equal to or higher than the charge protection voltage for one cell and equal to or lower than the discharge protection voltage for two cells, charging is cut off as a charge protection operation. When the measured voltage becomes smaller than a predetermined specific voltage smaller than the charge protection voltage for one cell, the charge protection operation is canceled and charging can be performed. When the measured voltage is equal to or lower than the discharge protection voltage for one cell, the discharge is interrupted as a discharge protection operation. When the measured voltage becomes larger than a predetermined specific voltage that is higher than the discharge protection voltage for one cell, the discharge protection operation is canceled and the discharge can be performed.

一方、保護動作部１５は、１セル分の電圧計測で２セル分の正常範囲の電圧が計測された場合には、電圧計側線１２に断線があると判断する。これは切替スイッチS11L、S11Hを閉じた状態では、電圧計測線１２が正常であればコンデンサＣがセルBatt1の電圧に充電されるはずであるが、２セル分の正常範囲の電圧が計測されたということは、コンデンサＣがセルBatt1の電圧によって充電されずに、直前に計測した２セル分の電圧がコンデンサＣに充電されいる状態と考えられるので電圧計測線１２が断線していると判断する。   On the other hand, the protection operation unit 15 determines that the voltmeter side line 12 is disconnected when a voltage in a normal range of 2 cells is measured by measuring the voltage of 1 cell. This is because when the change-over switches S11L and S11H are closed, if the voltage measurement line 12 is normal, the capacitor C should be charged to the voltage of the cell Batt1, but the voltage in the normal range for two cells is measured. This means that the capacitor C is not charged by the voltage of the cell Batt1, and the voltage measured for the last two cells is considered to be charged in the capacitor C, so that it is determined that the voltage measurement line 12 is disconnected. .

また、計測電圧が２セル分の放電保護電圧以上であった場合には、図３に示すように、セルBatt1の電圧を計測する電圧計測線１２に断線があると判断するようにしてもよい。この場合も、電圧計測線１２が正常であればコンデンサＣがセルBatt1の電圧に充電されるはずであるが、２セル分の放電保護電圧以上となったということは、コンデンサＣがセルBatt1の電圧に充電されずに、直前に計測した２セル分の電圧がコンデンサＣに充電された状態と考えられるからである。   If the measured voltage is equal to or higher than the discharge protection voltage for two cells, it may be determined that the voltage measuring line 12 for measuring the voltage of the cell Batt1 is disconnected as shown in FIG. . In this case as well, if the voltage measuring line 12 is normal, the capacitor C should be charged to the voltage of the cell Batt1, but the fact that the voltage exceeds the discharge protection voltage for two cells means that the capacitor C is in the cell Batt1. This is because it is considered that the voltage of the two cells measured immediately before is charged in the capacitor C without being charged with the voltage.

電圧計測線１２に断線があると判断したときは、電圧を計測できないセルBattiがあることになるので、バッテリパック１１に対して充電も放電も行えないようにする必要があり、充電保護動作及び充電保護動作の双方を行う。また、電圧計測線１２の断線は修理しない限り修復されないので、充電保護動作及び充電保護動作の解除は禁止とする。電圧計測線１２に断線が起こっているときは、修理が必要であることから運転員にその旨を報知しなければならないので、警報出力装置１６の表示器１７に断線を表示したり、音声出力装置１８により断線を報知する。   When it is determined that the voltage measurement line 12 is disconnected, there is a cell Batti that cannot measure the voltage. Therefore, it is necessary to prevent the battery pack 11 from being charged or discharged. Both charge protection operations are performed. Further, since the disconnection of the voltage measuring line 12 is not repaired unless repaired, the charge protection operation and the release of the charge protection operation are prohibited. When the voltage measuring line 12 is broken, it is necessary to notify the operator that the repair is necessary. Therefore, the broken line is displayed on the display unit 17 of the alarm output device 16 or a voice output is made. The device 18 notifies the disconnection.

次に、２セル分の出力電圧の計測について説明する。セルBatt1の出力電圧の計測が終了した後に、セルBatt2の出力電圧とセルBatt3の出力電圧の２セル分の出力電圧を計測する場合について説明する。切替スイッチS12L、S13Hを閉じ、コンデンサＣにセルBatt2の出力電圧とセルBatt3の出力電圧の２セル分の出力電圧を印加し電荷を充電する。電荷を充電させた後に、それぞれの切替スイッチS12L、S13Hを開き、出力側切替スイッチS22L、S22Hを閉じて２セル分の電圧を計測する。このときに計測された電圧によって、図４に示す保護動作を行う。   Next, measurement of the output voltage for two cells will be described. After the measurement of the output voltage of the cell Batt1, the case where the output voltage of two cells, that is, the output voltage of the cell Batt2 and the output voltage of the cell Batt3 is measured will be described. The change-over switches S12L and S13H are closed, and the output voltage corresponding to two cells of the output voltage of the cell Batt2 and the output voltage of the cell Batt3 is applied to the capacitor C to charge the charge. After charging the electric charge, the respective change-over switches S12L and S13H are opened, the output-side change-over switches S22L and S22H are closed, and the voltage for two cells is measured. The protection operation shown in FIG. 4 is performed by the voltage measured at this time.

計測電圧が２セル分の放電保護電圧を超え２セル分の充電保護電圧未満であるときは、２セル分の電圧は正常範囲である。従って、演算増幅器１４ｄ２からの２セル分の過放電検出信号Od2、演算増幅器１４ｃ２からの２セル分の過充電検出信号Oc2は保護操作部１５に出力されず、保護動作部１５による保護動作は行われない。   When the measured voltage exceeds the discharge protection voltage for 2 cells and is less than the charge protection voltage for 2 cells, the voltage for 2 cells is in the normal range. Accordingly, the two-cell overdischarge detection signal Od2 from the operational amplifier 14d2 and the two-cell overcharge detection signal Oc2 from the operational amplifier 14c2 are not output to the protection operation unit 15, and the protection operation by the protection operation unit 15 is performed. I will not.

次に、計測電圧が２セル分の充電保護電圧以上である場合は、充電保護動作として充電を遮断する。そして、計測電圧が２セル分の充電保護電圧より小さい予め定めた特定電圧より小さくなったときは、充電保護動作を解除し充電が行える状態とする。また、計測電圧が２セル分の放電保護電圧以下で１セル分の充電保護電圧を超えるときは、放電保護動作として放電を遮断する。そして、計測電圧が２セル分の放電保護電圧より大きい予め定めた特定電圧より大きくなったときは、放電保護動作を解除し放電が行える状態とする。   Next, when the measured voltage is equal to or higher than the charge protection voltage for two cells, charging is cut off as a charge protection operation. When the measured voltage becomes lower than a predetermined specific voltage that is smaller than the charge protection voltage for two cells, the charge protection operation is canceled and charging can be performed. Further, when the measured voltage is equal to or lower than the discharge protection voltage for two cells and exceeds the charge protection voltage for one cell, the discharge is interrupted as a discharge protection operation. When the measured voltage becomes larger than a predetermined specific voltage that is larger than the discharge protection voltage for two cells, the discharge protection operation is canceled and the discharge can be performed.

一方、保護動作部１５は、２セル分の電圧計測で１セル分の正常範囲の電圧が計測された場合には、電圧計側線１２に断線があると判断する。これは切替スイッチS12L、S13Hを閉じた状態では、電圧計測線１２が正常であればコンデンサＣが２セル分の電圧に充電されるはずであるが、１セル分の正常範囲の電圧が計測されたということは、コンデンサＣがセル２セル分の電圧によって充電されずに、直前に計測した１セル分の電圧がコンデンサＣに充電されいる状態と考えられるので電圧計測線１２が断線していると判断する。   On the other hand, the protection operation unit 15 determines that the voltmeter side line 12 is disconnected when the voltage in the normal range for one cell is measured by measuring the voltage for two cells. In this state, when the change-over switches S12L and S13H are closed, if the voltage measurement line 12 is normal, the capacitor C should be charged to the voltage for two cells, but the voltage in the normal range for one cell is measured. This means that the capacitor C is not charged by the voltage of two cells, and the voltage measured for the last one cell is considered to be charged to the capacitor C, so the voltage measurement line 12 is disconnected. Judge.

また、計測電圧が１セル分の放電保護電圧以下であった場合には、図５に示すように、電圧計測線１２に断線があると判断するようにしてもよい。この場合も、電圧計測線１２が正常であればコンデンサＣが２セル分の電圧に充電されるはずであるが、１セル分の放電保護電圧以下となったということは、コンデンサＣが２セル分の電圧に充電されずに、直前に計測した１セル分の電圧がコンデンサＣに充電された状態と考えられるからである。   Further, when the measured voltage is equal to or lower than the discharge protection voltage for one cell, it may be determined that the voltage measuring line 12 is disconnected as shown in FIG. In this case as well, if the voltage measuring line 12 is normal, the capacitor C should be charged to a voltage of 2 cells. This is because it is considered that the voltage of one cell measured immediately before is charged in the capacitor C without being charged to the voltage of the minute.

このように、１セル分と２セル分との計測を交互に行い、すべてのセルBatt1〜Battnの出力電圧の計測が終った場合に、再び、セルBatt1から計測を始める。この際には、直前のセルBatt1が１セル分で計測していた場合には、次の計測対象としてはセルBatt2の電圧とセルBatt3との２セルではなく、セルBatt1の電圧とセルBatt2との電圧の２セル分を計測することが望ましい。これは、２セル分の計測では、一方のセル電圧が保護すべき電圧となっていても他方のセル電圧によっては、２セル分の計測として保護すべき電圧にならない場合もあるからである。つまり、すべてのセルBatt1〜Battnを１セル分として必ず計測しておくためである。   As described above, measurement for one cell and two cells are alternately performed, and when measurement of output voltages of all the cells Batt1 to Battn is completed, measurement is started again from the cell Batt1. In this case, if the previous cell Batt1 was measured for one cell, the next measurement object is not the cell Batt2 voltage and the cell Batt3, but the cell Batt1 voltage and the cell Batt2. It is desirable to measure the voltage of 2 cells. This is because in the measurement for two cells, even if one cell voltage is a voltage to be protected, the other cell voltage may not be a voltage to be protected as a measurement for two cells. That is, all the cells Batt1 to Battn are always measured as one cell.

また、セルの個数によっては、再び、セルBatt1から計測を始めようとしたときに、２セル分の計測とならない場合がある。その場合は、まずセルBatt2の１セル分の電圧を計測し、その後にセルBatt1電圧とセルBatt2電圧との２セル分を計測するようにすればよい。   In addition, depending on the number of cells, when attempting to start measurement from the cell Batt1 again, measurement for two cells may not be performed. In that case, the voltage for one cell of the cell Batt2 may be measured first, and then two cells of the cell Batt1 voltage and the cell Batt2 voltage may be measured.

本発明の実施の形態によれば、セル電圧の計測によって電圧計測線１２の断線が検出できるので、電圧計測線１２の断線のためのステップを特別に設ける必要がない。なお、以上の説明では、１セル分の電圧計測において、断線と判断する電圧を２セル分の放電保護電圧としたが、１セル分の充電保護電圧より大きい特定の電圧とすることもできる。また、２セル分の電圧計測において、断線と判断する電圧を１セル分の充電保護電圧としたが、２セル分の放電保護電圧より小さい特定電圧とすることもできる。   According to the embodiment of the present invention, since the disconnection of the voltage measurement line 12 can be detected by measuring the cell voltage, it is not necessary to provide a special step for disconnecting the voltage measurement line 12. In the above description, in the voltage measurement for one cell, the voltage that is determined to be a disconnection is the discharge protection voltage for two cells, but may be a specific voltage that is higher than the charge protection voltage for one cell. In the voltage measurement for two cells, the voltage determined to be a disconnection is the charge protection voltage for one cell, but it can also be a specific voltage smaller than the discharge protection voltage for two cells.

本発明の実施の形態に係わるバッテリパックの監視保護装置の構成図。The block diagram of the monitoring protection apparatus of the battery pack concerning embodiment of this invention. 本発明の実施の形態における１セル分の出力電圧の計測の場合の保護動作の一例を示す説明図。Explanatory drawing which shows an example of the protection operation in the case of measurement of the output voltage for 1 cell in embodiment of this invention. 本発明の実施の形態における１セル分の出力電圧の計測の場合の保護動作の他の一例を示す説明図。Explanatory drawing which shows another example of the protection operation in the case of measurement of the output voltage for 1 cell in embodiment of this invention. 本発明の実施の形態における２セル分の出力電圧の計測の場合の保護動作の一例を示す説明図。Explanatory drawing which shows an example of the protection operation in the case of the measurement of the output voltage for 2 cells in embodiment of this invention. 本発明の実施の形態における２セル分の出力電圧の計測の場合の保護動作の他の一例を示す説明図。Explanatory drawing which shows another example of the protection operation | movement in the case of the measurement of the output voltage for 2 cells in embodiment of this invention.

符号の説明Explanation of symbols

１１…バッテリパック、１２…電圧計測線、１３…計測部、１４…演算増幅器、１５…保護操作部、１６…警報出力装置、１７…表示器、１８…音声出力装置 DESCRIPTION OF SYMBOLS 11 ... Battery pack, 12 ... Voltage measurement line, 13 ... Measurement part, 14 ... Operational amplifier, 15 ... Protection operation part, 16 ... Alarm output device, 17 ... Display, 18 ... Audio | voice output device

Claims (5)

複数個のセルが直列接続されたバッテリパックの電圧計測線に各々のセルのプラス端子とマイナス端子とに接続される切替スイッチを設け、１セル分の出力電圧は前記切替スイッチで１セルのプラス端子とマイナス端子とを接続して計測し、２セル分の出力電圧は前記切替スイッチで直列接続された２セルの一方のセルのプラス端子と他方のセルのマイナス端子とを接続して計測し、前記切替スイッチにより１セル分の出力電圧と２セル分の出力電圧とを交互に計測する計測部と、前記計測部で計測された１セル分の出力電圧または２セル分の出力電圧が所定範囲を逸脱したときはバッテリパックの保護動作を行い正常範囲に戻ったときは保護動作を解除する保護動作部とを備え、前記保護動作部は、２セル分の電圧計測で１セル分の正常範囲の電圧が計測された場合、または１セル分の電圧計測で２セル分の正常範囲の電圧が計測された場合には、電圧計測線に断線があると判断することを特徴とするバッテリパックの監視保護装置。 A changeover switch connected to the positive terminal and the negative terminal of each cell is provided on the voltage measurement line of the battery pack in which a plurality of cells are connected in series, and the output voltage for one cell is positive for one cell by the changeover switch. The output voltage for two cells is measured by connecting the positive terminal of one of the two cells connected in series with the changeover switch and the negative terminal of the other cell. The measurement unit that alternately measures the output voltage for one cell and the output voltage for two cells by the changeover switch, and the output voltage for one cell or the output voltage for two cells measured by the measurement unit are predetermined. when when deviating from the range returned to the normal range performs the protection operation of the battery pack e Bei a protection operation unit to cancel the protection operation, the protection operation unit of one cell at a voltage measurement of two cells Normal If the voltage of is measured, or 1 when the voltage of the normal range of two cells is measured by the voltage measurement of the cell fraction, the battery pack and determines that there is a disconnection voltage measurement line Surveillance protection device. 前記保護動作部は、前記正常範囲の電圧が計測された場合に代えて、２セル分の電圧計測で１セル分の充電保護電圧以下の電圧が計測された場合、または、１セル分の電圧計測で２セル分の放電保護電圧以上の電圧が計測された場合には、電圧計測線に断線があると判断することを特徴とする請求項１に記載のバッテリパックの監視保護装置。 The protection operation unit replaces the case where the voltage in the normal range is measured, when a voltage equal to or lower than the charge protection voltage for one cell is measured in the voltage measurement for two cells, or the voltage for one cell 2. The battery pack monitoring and protecting device according to claim 1, wherein when a voltage equal to or higher than a discharge protection voltage for two cells is measured, the voltage measuring line is determined to be disconnected. 前記保護動作部は、前記電圧計測線に断線があると判断した場合には、充電保護動作および放電保護動作の双方を行うことを特徴とする請求項１または２に記載のバッテリパックの監視保護装置。 3. The battery pack monitoring protection according to claim 1, wherein the protection operation unit performs both the charge protection operation and the discharge protection operation when it is determined that the voltage measurement line is disconnected. 4. apparatus. 前記保護動作部は、充電保護動作及び放電保護動作の解除を禁止することを特徴とする請求項３記載のバッテリパックの監視保護装置。 4. The battery pack monitoring and protection device according to claim 3 , wherein the protection operation unit prohibits the release of the charge protection operation and the discharge protection operation. 前記保護動作部は、前記電圧計測線に断線があると判断した場合には、その旨を警報出力することを特徴とする請求項３または４記載のバッテリパックの監視保護装置。 5. The battery pack monitoring and protection device according to claim 3 , wherein, when it is determined that the voltage measurement line is disconnected, the protection operation unit outputs an alarm to that effect.
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