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JP6959046B2 - Charge / discharge control circuit and battery device - Google Patents

Charge / discharge control circuit and battery device Download PDF

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JP6959046B2
JP6959046B2 JP2017125291A JP2017125291A JP6959046B2 JP 6959046 B2 JP6959046 B2 JP 6959046B2 JP 2017125291 A JP2017125291 A JP 2017125291A JP 2017125291 A JP2017125291 A JP 2017125291A JP 6959046 B2 JP6959046 B2 JP 6959046B2
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power supply
secondary battery
charge
terminal
supply terminal
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JP2018110509A (en
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桜井　敦司
貴士 小野
和秀 安田
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Ablic Inc
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Ablic Inc
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Priority to TW106134069A priority Critical patent/TWI700876B/en
Priority to US15/791,707 priority patent/US10333317B2/en
Priority to KR1020170138468A priority patent/KR102355429B1/en
Priority to CN201711002269.3A priority patent/CN108258751B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

本発明は、充放電制御回路およびバッテリ装置に関する。 The present invention relates to a charge / discharge control circuit and a battery device.

従来、制御部（制御回路）を有する充放電制御回路（バッテリ状態監視回路）と、複数の二次電池（バッテリ）とを備えるバッテリ装置が知られている（例えば、特許文献１を参照）。特許文献１に記載されたバッテリ装置では、直列に接続された複数の二次電池の充放電電流の制御が、充放電制御回路の制御部によって行われる。 Conventionally, a battery device including a charge / discharge control circuit (battery condition monitoring circuit) having a control unit (control circuit) and a plurality of secondary batteries (batteries) is known (see, for example, Patent Document 1). In the battery device described in Patent Document 1, the charge / discharge currents of a plurality of secondary batteries connected in series are controlled by the control unit of the charge / discharge control circuit.

特開２００９−１５９８１１号公報Japanese Unexamined Patent Publication No. 2009-159811

特許文献１に記載されたバッテリ装置では、複数の二次電池が直列に接続されているが、代わりに、複数の二次電池が並列に接続される場合が考えられる。
特許文献１に記載されたバッテリ装置では、充放電制御回路の制御部は、二次電池の充放電電流によって動作する。また、特許文献１に記載されたバッテリ装置では、複数の二次電池が直列に接続されているため、複数の二次電池のうちの１つの二次電池に脱落、内部オープンなどの異常が発生した場合に、充放電制御回路の制御部が充放電を制御できなくなることがある。 In the battery device described in Patent Document 1, a plurality of secondary batteries are connected in series, but instead, a plurality of secondary batteries may be connected in parallel.
In the battery device described in Patent Document 1, the control unit of the charge / discharge control circuit operates by the charge / discharge current of the secondary battery. Further, in the battery device described in Patent Document 1, since a plurality of secondary batteries are connected in series, an abnormality such as dropping or internal opening occurs in one of the plurality of secondary batteries. In that case, the control unit of the charge / discharge control circuit may not be able to control the charge / discharge.

特許文献１に記載されたバッテリ装置では、１つの二次電池に異常が発生した場合に、他の二次電池と外部端子（出力端子）との間の接続が遮断される。そのため、充放電制御回路の制御部が充放電を制御できなくなっても、特に問題は発生しない。 In the battery device described in Patent Document 1, when an abnormality occurs in one secondary battery, the connection between the other secondary battery and the external terminal (output terminal) is cut off. Therefore, even if the control unit of the charge / discharge control circuit cannot control the charge / discharge, no particular problem occurs.

ところが、複数の二次電池が並列に接続される例では、１つの二次電池に異常が発生した場合に、他の二次電池と外部端子（出力端子）との間の接続が遮断されるわけではない。そのため、複数の二次電池が並列に接続される例では、１つの二次電池に異常が発生した場合に充放電制御回路の制御部が充放電を制御できなくなると、バッテリ装置が不安定な状態になってしまうおそれがある。 However, in the example in which a plurality of secondary batteries are connected in parallel, when an abnormality occurs in one secondary battery, the connection between the other secondary battery and the external terminal (output terminal) is cut off. Do not mean. Therefore, in an example in which a plurality of secondary batteries are connected in parallel, if an abnormality occurs in one secondary battery and the control unit of the charge / discharge control circuit cannot control the charge / discharge, the battery device becomes unstable. There is a risk of becoming a state.

本発明は、並列に接続された複数の二次電池のうちの１つの二次電池に異常が発生した場合においても制御部が充放電電流の制御を行うことができる充放電制御回路およびバッテリ装置を提供することを目的とする。 The present invention is a charge / discharge control circuit and a battery device capable of controlling the charge / discharge current even when an abnormality occurs in one of a plurality of secondary batteries connected in parallel. The purpose is to provide.

本発明の充放電制御回路は、充放電制御回路は、第１二次電池の第１電極が接続される第１電源端子と、第１二次電池に並列接続された第２二次電池の第１電極が接続される第２電源端子と、第１二次電池及び第２二次電池の第２電極が接続される第３電源端子と、第１電源端子と第２電源端子とを接続して接続後の電位を出力する接続回路と、接続回路から出力される電位と第３電源端子から供給される電位との電位差を電源電圧として動作し、第１二次電池及び第２二次電池の充放電を制御する制御部と、を備えることを特徴とする。 In the charge / discharge control circuit of the present invention, the charge / discharge control circuit consists of a first power supply terminal to which the first electrode of the primary secondary battery is connected and a secondary secondary battery connected in parallel to the primary secondary battery. Connect the 2nd power supply terminal to which the 1st electrode is connected, the 3rd power supply terminal to which the 2nd electrode of the 1st secondary battery and the 2nd secondary battery is connected, and the 1st power supply terminal and the 2nd power supply terminal. The potential difference between the connection circuit that outputs the potential after connection and the potential output from the connection circuit and the potential supplied from the third power supply terminal operates as the power supply voltage, and the primary secondary battery and the secondary secondary battery operate. It is characterized by including a control unit that controls charging and discharging of a battery.

本発明の充放電制御回路によれば、制御部と電源端子の間に接続回路を備えたので、並列に接続された複数の二次電池のうちの１つの二次電池に異常が発生した場合においても、制御部が充放電電流の制御をすることが出来る。 According to the charge / discharge control circuit of the present invention, since the connection circuit is provided between the control unit and the power supply terminal, when an abnormality occurs in one of the plurality of secondary batteries connected in parallel. Also, the control unit can control the charge / discharge current.

第１実施形態に係る充放電制御回路が適用されたバッテリ装置の機能構成を示す図である。It is a figure which shows the functional structure of the battery apparatus to which the charge / discharge control circuit which concerns on 1st Embodiment is applied. 第２実施形態に係る充放電制御回路が適用されたバッテリ装置の機能構成を示す図である。It is a figure which shows the functional structure of the battery apparatus to which the charge / discharge control circuit which concerns on 2nd Embodiment is applied. 第３実施形態に係る充放電制御回路が適用されたバッテリ装置の機能構成を示す図である。It is a figure which shows the functional structure of the battery apparatus to which the charge / discharge control circuit which concerns on 3rd Embodiment is applied.

［第１実施形態］
以下、図を参照して充放電制御回路１０の実施形態について説明する。
図１は、第１実施形態に係る充放電制御回路１０が適用されたバッテリ装置１の機能構成を示す図である。 [First Embodiment]
Hereinafter, embodiments of the charge / discharge control circuit 10 will be described with reference to the drawings.
FIG. 1 is a diagram showing a functional configuration of a battery device 1 to which the charge / discharge control circuit 10 according to the first embodiment is applied.

バッテリ装置１は、充放電制御回路１０と、第１二次電池Ｂ１と、第２二次電池Ｂ２と、第１外部端子ＥＢ＋と、第２外部端子ＥＢ−と、放電制御スイッチＳＤ１と、充電制御スイッチＳＣ１と、放電制御スイッチＳＤ２と、充電制御スイッチＳＣ２と、抵抗Ｒとを備えている。 The battery device 1 charges the charge / discharge control circuit 10, the primary secondary battery B1, the secondary secondary battery B2, the first external terminal EB +, the second external terminal EB-, the discharge control switch SD1 and the like. It includes a control switch SC1, a discharge control switch SD2, a charge control switch SC2, and a resistor R.

第１二次電池Ｂ１と、第２二次電池Ｂ２とは、二次電池Ｂを構成する。第１二次電池Ｂ１は、第１電極Ｂ１１と、第２電極Ｂ１２とを備えている。第２二次電池Ｂ２は、第１電極Ｂ２１と、第２電極Ｂ２２とを備えている。
第１外部端子ＥＢ＋と、第２外部端子ＥＢ−とは、外部端子ＥＢを構成する。 The primary secondary battery B1 and the secondary secondary battery B2 constitute a secondary battery B. The first secondary battery B1 includes a first electrode B11 and a second electrode B12. The second secondary battery B2 includes a first electrode B21 and a second electrode B22.
The first external terminal EB + and the second external terminal EB- constitute an external terminal EB.

放電制御スイッチＳＤ１と充電制御スイッチＳＣ１とは、第１充放電制御スイッチを構成する。放電制御スイッチＳＤ２と充電制御スイッチＳＣ２とは、第２充放電制御スイッチを構成する。 The discharge control switch SD1 and the charge control switch SC1 form a first charge / discharge control switch. The discharge control switch SD2 and the charge control switch SC2 constitute a second charge / discharge control switch.

バッテリ装置１は、二次電池Ｂに充電されている電力を外部端子ＥＢを介して外部に供給し、外部端子ＥＢを介して外部から供給される電力を二次電池Ｂに充電する。バッテリ装置１は、必要に応じた並列数の二次電池Ｂを備える。 The battery device 1 supplies the electric power charged in the secondary battery B to the outside via the external terminal EB, and charges the secondary battery B with the electric power supplied from the outside via the external terminal EB. The battery device 1 includes a number of secondary batteries B in parallel as required.

充放電制御回路１０は、第１電源端子ＶＳＳ１と、第２電源端子ＶＳＳ２と、第３電源端子ＶＤＤと、放電制御端子ＤＯと、充電制御端子ＣＯと、過電流検出端子ＶＭと、第１電圧検出部１１１と、第２電圧検出部１１２と、接続回路１４と、制御部１２と、ドライバ１３とを備えている。 The charge / discharge control circuit 10 includes a first power supply terminal VSS1, a second power supply terminal VSS2, a third power supply terminal VDD, a discharge control terminal DO, a charge control terminal CO, an overcurrent detection terminal VM, and a first voltage. It includes a detection unit 111, a second voltage detection unit 112, a connection circuit 14, a control unit 12, and a driver 13.

第１電圧検出部１１１と、第２電圧検出部１１２とは、電圧検出部１１を構成する。接続回路１４は、第１抵抗１４１と、第２抵抗１４２とを備えている。第１抵抗１４１は、第１端子１４１ａと、第２端子１４１ｂとを備えている。第２抵抗１４２は、第１端子１４２ａと、第２端子１４２ｂとを備えている。 The first voltage detection unit 111 and the second voltage detection unit 112 form a voltage detection unit 11. The connection circuit 14 includes a first resistor 141 and a second resistor 142. The first resistor 141 includes a first terminal 141a and a second terminal 141b. The second resistor 142 includes a first terminal 142a and a second terminal 142b.

第１外部端子ＥＢ＋は、第１二次電池Ｂ１の第２電極Ｂ１２と、第２二次電池Ｂ２の第２電極Ｂ２２と、充放電制御回路１０の第３電源端子ＶＤＤに接続されている。第１二次電池Ｂ１の第１電極Ｂ１１は、充放電制御回路１０の第１電源端子ＶＳＳ１と、放電制御スイッチＳＤ１の一方の端子に接続されている。第２二次電池Ｂ２の第１電極Ｂ２１は、充放電制御回路１０の第２電源端子ＶＳＳ２と、放電制御スイッチＳＤ２の一方の端子に接続されている。放電制御スイッチＳＤ１は、他方の端子が充電制御スイッチＳＣ１の一方の端子に接続され、放電制御端子ＤＯの信号で制御される。放電制御スイッチＳＤ２は、他方の端子が充電制御スイッチＳＣ２の一方の端子に接続され、放電制御端子ＤＯの信号で制御される。充電制御スイッチＳＣ１は、他方の端子が第２外部端子ＥＢ−に接続され、充電制御端子ＣＯの信号で制御される。充電制御スイッチＳＣ２は、他方の端子が第２外部端子ＥＢ−に接続され、充電制御端子ＣＯの信号で制御される。過電流検出端子ＶＭは、抵抗Ｒを介して第２外部端子ＥＢ−に接続されている。 The first external terminal EB + is connected to the second electrode B12 of the primary secondary battery B1, the second electrode B22 of the secondary secondary battery B2, and the third power supply terminal VDD of the charge / discharge control circuit 10. The first electrode B11 of the first secondary battery B1 is connected to one terminal of the first power supply terminal VSS1 of the charge / discharge control circuit 10 and the discharge control switch SD1. The first electrode B21 of the second secondary battery B2 is connected to one terminal of the second power supply terminal VSS2 of the charge / discharge control circuit 10 and the discharge control switch SD2. The other terminal of the discharge control switch SD1 is connected to one terminal of the charge control switch SC1 and is controlled by the signal of the discharge control terminal DO. The other terminal of the discharge control switch SD2 is connected to one terminal of the charge control switch SC2, and is controlled by the signal of the discharge control terminal DO. The other terminal of the charge control switch SC1 is connected to the second external terminal EB- and is controlled by the signal of the charge control terminal CO. The other terminal of the charge control switch SC2 is connected to the second external terminal EB- and is controlled by the signal of the charge control terminal CO. The overcurrent detection terminal VM is connected to the second external terminal EB- via a resistor R.

第１電圧検出部１１１は、第１電源端子ＶＳＳ１と、第３電源端子ＶＤＤと、過電流検出端子ＶＭと、制御部１２に接続されている。第２電圧検出部１１２は、第２電源端子ＶＳＳ２と、第３電源端子ＶＤＤと、過電流検出端子ＶＭと、制御部１２に接続されている。接続回路１４の第１抵抗１４１は、第１端子１４１ａが第１電源端子ＶＳＳ１に接続され、第２端子１４１ｂが制御部１２に接続されている。接続回路１４の第２抵抗１４２は、第１端子１４２ａが第２電源端子ＶＳＳ２に接続され、第２端子１４２ｂが制御部１２に接続されている。制御部１２は、ドライバ１３に接続されている。ドライバ１３は、放電制御端子ＤＯと充電制御端子ＣＯに接続されている。 The first voltage detection unit 111 is connected to the first power supply terminal VSS1, the third power supply terminal VDD, the overcurrent detection terminal VM, and the control unit 12. The second voltage detection unit 112 is connected to the second power supply terminal VSS2, the third power supply terminal VDD, the overcurrent detection terminal VM, and the control unit 12. In the first resistor 141 of the connection circuit 14, the first terminal 141a is connected to the first power supply terminal VSS1, and the second terminal 141b is connected to the control unit 12. In the second resistor 142 of the connection circuit 14, the first terminal 142a is connected to the second power supply terminal VSS2, and the second terminal 142b is connected to the control unit 12. The control unit 12 is connected to the driver 13. The driver 13 is connected to the discharge control terminal DO and the charge control terminal CO.

第１電圧検出部１１１は、第１電源端子ＶＳＳ１の電位と第３電源端子ＶＤＤの電位とに基づいて第１二次電池Ｂ１の電圧を検出する。また、第１電圧検出部１１１は、図１に示す例では、第１電源端子ＶＳＳ１と過電流検出端子ＶＭの間の電圧に基づいて第１充放電制御スイッチに流れる過電流を検出する。 The first voltage detection unit 111 detects the voltage of the first secondary battery B1 based on the potential of the first power supply terminal VSS1 and the potential of the third power supply terminal VDD. Further, in the example shown in FIG. 1, the first voltage detection unit 111 detects the overcurrent flowing through the first charge / discharge control switch based on the voltage between the first power supply terminal VSS1 and the overcurrent detection terminal VM.

第２電圧検出部１１２は、第２電源端子ＶＳＳ２の電位と第３電源端子ＶＤＤの電位とに基づいて第２二次電池Ｂ２の電圧を検出する。また、第２電圧検出部１１２は、図１に示す例では、第２電源端子ＶＳＳ２と過電流検出端子ＶＭの間の電圧に基づいて第２充放電制御スイッチに流れる過電流を検出する。 The second voltage detection unit 112 detects the voltage of the secondary battery B2 based on the potential of the second power supply terminal VSS2 and the potential of the third power supply terminal VDD. Further, in the example shown in FIG. 1, the second voltage detection unit 112 detects the overcurrent flowing through the second charge / discharge control switch based on the voltage between the second power supply terminal VSS2 and the overcurrent detection terminal VM.

接続回路１４は、第１電源端子ＶＳＳ１と第２電源端子ＶＳＳ２とを第１抵抗１４１及び第２抵抗１４２を介して接続し、接続後の電位を制御部１２に出力する。
制御部１２は、第１電圧検出部１１１による検出結果及び第２電圧検出部１１２による検出結果に基づいて、第１二次電池Ｂ１及び第２二次電池Ｂ２の充放電電流を制御する信号を出力する。また、制御部１２は、接続回路１４から出力される電位と第３電源端子ＶＤＤから供給される電位との電位差を電源電圧として動作する。 The connection circuit 14 connects the first power supply terminal VSS1 and the second power supply terminal VSS2 via the first resistor 141 and the second resistor 142, and outputs the potential after the connection to the control unit 12.
The control unit 12 outputs a signal for controlling the charge / discharge currents of the primary secondary battery B1 and the secondary battery B2 based on the detection result by the first voltage detection unit 111 and the detection result by the second voltage detection unit 112. Output. Further, the control unit 12 operates using the potential difference between the potential output from the connection circuit 14 and the potential supplied from the third power supply terminal VDD as the power supply voltage.

ドライバ１３は、制御部１２が出力する信号に基づいて、充電制御端子ＣＯから充電制御スイッチＳＣ１及び充電制御スイッチＳＣ２を制御する信号を出力し、放電制御端子ＤＯから放電制御スイッチＳＤ１及び放電制御スイッチＳＤ２を制御する信号を出力する。 The driver 13 outputs a signal for controlling the charge control switch SC1 and the charge control switch SC2 from the charge control terminal CO based on the signal output by the control unit 12, and discharge control switch SD1 and the discharge control switch from the discharge control terminal DO. Outputs a signal that controls SD2.

充電制御スイッチＳＣ１は、第１二次電池Ｂ１に対する充電電流を制御する。充電制御スイッチＳＣ２は、第２二次電池Ｂ２に対する充電電流を制御する。放電制御スイッチＳＤ１は、第１二次電池Ｂ１による放電電流を制御する。放電制御スイッチＳＤ２は、第２二次電池Ｂ２による放電電流を制御する。 The charge control switch SC1 controls the charge current for the primary secondary battery B1. The charge control switch SC2 controls the charge current for the secondary battery B2. The discharge control switch SD1 controls the discharge current of the primary secondary battery B1. The discharge control switch SD2 controls the discharge current of the secondary secondary battery B2.

以下の説明においては、これらのスイッチを総称して「制御スイッチ」とも記載する。また、充電制御スイッチＳＣ１及び充電制御スイッチＳＣ２を総称して充電制御スイッチとも記載し、放電制御スイッチＳＤ１及び放電制御スイッチＳＤ２を総称して放電制御スイッチとも記載する。
これらの制御スイッチはいずれも、例えばＦＥＴスイッチであり、充放電制御回路１０の制御に基づいてオン又はオフ動作する。 In the following description, these switches are also collectively referred to as "control switches". Further, the charge control switch SC1 and the charge control switch SC2 are collectively referred to as a charge control switch, and the discharge control switch SD1 and the discharge control switch SD2 are also collectively referred to as a discharge control switch.
Each of these control switches is, for example, an FET switch, and operates on or off based on the control of the charge / discharge control circuit 10.

制御部１２は、電圧検出部１１の検出結果に基づいて、ドライバ１３を介して制御スイッチを制御することにより、二次電池Ｂの充放電を制御する。
以下、制御部１２による制御の一例について説明する。
電圧検出部１１の検出結果が「通常状態」を示す場合に、制御部１２は、制御スイッチのそれぞれをオン状態に制御する。 The control unit 12 controls the charge / discharge of the secondary battery B by controlling the control switch via the driver 13 based on the detection result of the voltage detection unit 11.
Hereinafter, an example of control by the control unit 12 will be described.
When the detection result of the voltage detection unit 11 indicates a "normal state", the control unit 12 controls each of the control switches to the on state.

第１電圧検出部１１１の検出結果が「過充電」を示す場合、つまり、第１二次電池Ｂ１が過充電状態になった場合に、制御部１２は充電制御スイッチをオフ状態に制御する。これにより、二次電池Ｂは、充電電流が遮断され、充電が停止する。 When the detection result of the first voltage detection unit 111 indicates "overcharge", that is, when the primary secondary battery B1 is in the overcharge state, the control unit 12 controls the charge control switch to the off state. As a result, the charging current of the secondary battery B is cut off and charging is stopped.

第１電圧検出部１１１の検出結果が「過放電」を示す場合、つまり、第１二次電池Ｂ１が過放電状態になった場合に、制御部１２は放電制御スイッチをオフ状態に制御する。これにより、二次電池Ｂは、放電電流が遮断され、放電が停止する。 When the detection result of the first voltage detection unit 111 indicates "over-discharge", that is, when the primary secondary battery B1 is in the over-discharged state, the control unit 12 controls the discharge control switch to the off state. As a result, the discharge current of the secondary battery B is cut off, and the discharge is stopped.

第２電圧検出部１１２の検出結果が「過充電」を示す場合、つまり、第２二次電池Ｂ２が過充電状態になった場合に、制御部１２は充電制御スイッチをオフ状態に制御する。これにより、二次電池Ｂは、充電電流が遮断され、充電が停止する。 When the detection result of the second voltage detection unit 112 indicates "overcharge", that is, when the secondary secondary battery B2 is in the overcharge state, the control unit 12 controls the charge control switch to the off state. As a result, the charging current of the secondary battery B is cut off and charging is stopped.

第２電圧検出部１１２の検出結果が「過放電」を示す場合、つまり、第２二次電池Ｂ２が過放電状態になった場合に、制御部１２は放電制御スイッチをオフ状態に制御する。これにより、二次電池Ｂは、放電電流が遮断され、放電が停止する。 When the detection result of the second voltage detection unit 112 indicates "over-discharge", that is, when the second secondary battery B2 is in the over-discharged state, the control unit 12 controls the discharge control switch to the off state. As a result, the discharge current of the secondary battery B is cut off, and the discharge is stopped.

ここで、バッテリ装置１に故障が生じて、第１電源端子ＶＳＳ１又は第２電源端子ＶＳＳ２に対して電位が供給できなくなった場合について説明する。
一例として、第２二次電池Ｂ２の第１電極Ｂ２１に接続されている導線が断線して、第２電源端子ＶＳＳ２に電位が供給できなくなった場合について説明する。 Here, a case where a failure occurs in the battery device 1 and the potential cannot be supplied to the first power supply terminal VSS1 or the second power supply terminal VSS2 will be described.
As an example, a case where the lead wire connected to the first electrode B21 of the secondary secondary battery B2 is broken and the potential cannot be supplied to the second power supply terminal VSS2 will be described.

充放電制御回路１０は、第２電源端子ＶＳＳ２に第２二次電池Ｂ２の第１電極Ｂ２１の電位が供給されない。このため、接続回路１４は、第１電源端子ＶＳＳ１の電位を出力する。従って、制御部１２は、第３電源端子ＶＤＤの電位と第１電源端子ＶＳＳ１の電位との電位差を電源電圧として動作する。 In the charge / discharge control circuit 10, the potential of the first electrode B21 of the secondary battery B2 is not supplied to the second power supply terminal VSS2. Therefore, the connection circuit 14 outputs the potential of the first power supply terminal VSS1. Therefore, the control unit 12 operates using the potential difference between the potential of the third power supply terminal VDD and the potential of the first power supply terminal VSS1 as the power supply voltage.

つまり、充放電制御回路１０は、接続回路１４を備えることにより、第１電源端子ＶＳＳ１および第２電源端子ＶＳＳ２のいずれか一方から電位が供給されない状況になったとしても、制御部１２を動作させることができる。 That is, by providing the connection circuit 14, the charge / discharge control circuit 10 operates the control unit 12 even if the potential is not supplied from either the first power supply terminal VSS1 or the second power supply terminal VSS2. be able to.

また、第２二次電池Ｂ２に脱落または内部オープンなどの異常が発生した場合に、第１二次電池Ｂ１によって制御部１２に電源電圧が供給されるので、制御部１２は動作することができる。 Further, when an abnormality such as dropping or internal opening occurs in the secondary secondary battery B2, the power supply voltage is supplied to the control unit 12 by the primary secondary battery B1, so that the control unit 12 can operate. ..

同様に、第１二次電池Ｂ１の導線が断線、または第１二次電池Ｂ１に脱落または内部オープンなどの異常が発生した場合に、第２二次電池Ｂ２によって制御部１２に電源電圧が供給されるので、制御部１２は動作することができる。 Similarly, when the lead wire of the primary secondary battery B1 is broken, or when an abnormality such as dropping or internal opening occurs in the primary secondary battery B1, the power supply voltage is supplied to the control unit 12 by the secondary battery B2. Therefore, the control unit 12 can operate.

以上説明したように、第１実施形態のバッテリ装置１は、並列に接続された複数の二次電池のうち、いずれかの二次電池の出力配線が断線したとしても、他の二次電池への充放電及び監視が可能である。
また、例えば、第１二次電池Ｂ１の内部で短絡してしまった場合、第２二次電池Ｂ２に第１二次電池Ｂ１と制御スイッチまたは接続回路１４を経由して大電流が流れてしまう。 As described above, the battery device 1 of the first embodiment transfers to another secondary battery even if the output wiring of any of the secondary batteries connected in parallel is disconnected. It is possible to charge / discharge and monitor.
Further, for example, when a short circuit occurs inside the primary secondary battery B1, a large current flows through the secondary secondary battery B2 via the primary secondary battery B1 and the control switch or the connection circuit 14. ..

このとき、接続回路１４の抵抗値は、制御スイッチのオン抵抗値よりも大きく、また、接続回路１４を経由する電流を十分に制限できる程度に大きくする。このようにすることで、電流の大部分は制御スイッチに経由することになる。更に、充放電制御回路１０が過電流を検出して充電スイッチをオフした後も、接続回路１４に流れる電流は十分に制限されるので、充放電制御回路１０は損傷することがない。
同様に、第２二次電池Ｂ２の内部で短絡してしまった場合においても、充放電制御回路１０は損傷することがない。 At this time, the resistance value of the connection circuit 14 is larger than the on-resistance value of the control switch, and is large enough to sufficiently limit the current passing through the connection circuit 14. By doing so, most of the current goes through the control switch. Further, even after the charge / discharge control circuit 10 detects the overcurrent and turns off the charge switch, the current flowing through the connection circuit 14 is sufficiently limited, so that the charge / discharge control circuit 10 is not damaged.
Similarly, even if a short circuit occurs inside the secondary battery B2, the charge / discharge control circuit 10 will not be damaged.

また、例えば、過放電状態において放電制御スイッチがオフしている状態でも、第１二次電池Ｂ１と第２二次電池Ｂ２は第１抵抗１４１及び第２抵抗１４２を介して接続されているので、第１二次電池Ｂ１と第２二次電池Ｂ２の電圧のバランスを取ることができる、という効果もある。 Further, for example, even when the discharge control switch is off in the over-discharged state, the primary secondary battery B1 and the secondary secondary battery B2 are connected via the first resistance 141 and the second resistance 142. There is also an effect that the voltages of the primary secondary battery B1 and the secondary secondary battery B2 can be balanced.

［第２実施形態］
以下、第２実施形態の充放電制御回路１０について説明する。第２実施形態の充放電制御回路１０は、後述する点を除き、上述した第１実施形態の充放電制御回路１０と同様に構成されている。従って、第１実施形態の充放電制御回路１０と同様の構成については説明を省略する。 [Second Embodiment]
Hereinafter, the charge / discharge control circuit 10 of the second embodiment will be described. The charge / discharge control circuit 10 of the second embodiment is configured in the same manner as the charge / discharge control circuit 10 of the first embodiment described above, except for the points described later. Therefore, the description of the same configuration as the charge / discharge control circuit 10 of the first embodiment will be omitted.

図２は、第２実施形態に係る充放電制御回路１０が適用されたバッテリ装置１の機能構成を示す図である。
接続回路１４は、第１ダイオード１４３と、第２ダイオード１４４とを備えている。第１ダイオード１４３は、カソード端子１４３ａと、アノード端子１４３ｂとを備えている。第２ダイオード１４４は、カソード端子１４４ａと、アノード端子１４４ｂとを備えている。第１ダイオード１４３は、カソード端子１４３ａが第１電源端子ＶＳＳ１に接続され、アノード端子１４３ｂが制御部１２に接続されている。第２ダイオード１４４は、カソード端子１４４ａが第２電源端子ＶＳＳ２に接続され、アノード端子１４４ｂが制御部１２に接続されている。 FIG. 2 is a diagram showing a functional configuration of the battery device 1 to which the charge / discharge control circuit 10 according to the second embodiment is applied.
The connection circuit 14 includes a first diode 143 and a second diode 144. The first diode 143 includes a cathode terminal 143a and an anode terminal 143b. The second diode 144 includes a cathode terminal 144a and an anode terminal 144b. In the first diode 143, the cathode terminal 143a is connected to the first power supply terminal VSS1 and the anode terminal 143b is connected to the control unit 12. In the second diode 144, the cathode terminal 144a is connected to the second power supply terminal VSS2, and the anode terminal 144b is connected to the control unit 12.

接続回路１４をこのように構成した第２実施形態のバッテリ装置１は、第１実施形態と同様に、並列に接続された複数の二次電池のうち、いずれかの二次電池の出力配線が断線したとしても、他の二次電池への充放電及び監視が可能である。 In the battery device 1 of the second embodiment in which the connection circuit 14 is configured in this way, as in the first embodiment, the output wiring of any of the plurality of secondary batteries connected in parallel is Even if the wire is broken, it is possible to charge / discharge and monitor other secondary batteries.

更に、第１二次電池Ｂ１または第２二次電池Ｂ２の内部で短絡してしまった場合、二次電池Ｂから接続回路１４を経由した電流が流れることはないので、充放電制御回路１０は損傷することがない。 Further, if a short circuit occurs inside the primary secondary battery B1 or the secondary secondary battery B2, the current does not flow from the secondary battery B via the connection circuit 14, so that the charge / discharge control circuit 10 has a charge / discharge control circuit 10. It will not be damaged.

［第３実施形態］
以下、第３実施形態の充放電制御回路１０について説明する。第３実施形態の充放電制御回路１０は、後述する点を除き、上述した第１実施形態の充放電制御回路１０と同様に構成されている。従って、第１実施形態の充放電制御回路１０と同様の構成については説明を省略する。 [Third Embodiment]
Hereinafter, the charge / discharge control circuit 10 of the third embodiment will be described. The charge / discharge control circuit 10 of the third embodiment is configured in the same manner as the charge / discharge control circuit 10 of the first embodiment described above, except for the points described later. Therefore, the description of the same configuration as the charge / discharge control circuit 10 of the first embodiment will be omitted.

図３は、第３実施形態に係る充放電制御回路１０が適用されたバッテリ装置１の機能構成を示す図である。
接続回路１４は、第１定電流ダイオード１４５と、第２定電流ダイオード１４６とを備えている。第１定電流ダイオード１４５は、アノード端子１４５ａと、カソード端子１４５ｂとを備えている。第２定電流ダイオード１４４は、アノード端子１４６ａと、カソード端子１４６ｂとを備えている。第１定電流ダイオード１４５は、アノード端子１４５ａが第１電源端子ＶＳＳ１に接続され、カソード端子１４５ｂが制御部１２に接続されている。第２定電流ダイオード１４６は、アノード端子１４６ａが第２電源端子ＶＳＳ２に接続され、カソード端子１４６ｂが制御部１２に接続されている。 FIG. 3 is a diagram showing a functional configuration of the battery device 1 to which the charge / discharge control circuit 10 according to the third embodiment is applied.
The connection circuit 14 includes a first constant current diode 145 and a second constant current diode 146. The first constant current diode 145 includes an anode terminal 145a and a cathode terminal 145b. The second constant current diode 144 includes an anode terminal 146a and a cathode terminal 146b. In the first constant current diode 145, the anode terminal 145a is connected to the first power supply terminal VSS1 and the cathode terminal 145b is connected to the control unit 12. In the second constant current diode 146, the anode terminal 146a is connected to the second power supply terminal VSS2, and the cathode terminal 146b is connected to the control unit 12.

接続回路１４をこのように構成した第３実施形態のバッテリ装置１は、第１実施形態と同様に、並列に接続された複数の二次電池のうち、いずれかの二次電池の出力配線が断線したとしても、他の二次電池への充放電及び監視が可能である。 In the battery device 1 of the third embodiment in which the connection circuit 14 is configured in this way, as in the first embodiment, the output wiring of any of the plurality of secondary batteries connected in parallel is Even if the wire is broken, it is possible to charge / discharge and monitor other secondary batteries.

また、例えば、第１二次電池Ｂ１の内部で短絡してしまった場合、接続回路１４に流れる電流は第１定電流ダイオード１４５のピンチオフ電圧に制限されるので、そのピンチオフ電圧を適当な値に設定すれば、充放電制御回路１０は損傷することがない。第２二次電池Ｂ２の内部で短絡してしまった場合も、同様に、充放電制御回路１０は損傷することがない。 Further, for example, when a short circuit occurs inside the primary secondary battery B1, the current flowing through the connection circuit 14 is limited to the pinch-off voltage of the first constant current diode 145, so that the pinch-off voltage is set to an appropriate value. If set, the charge / discharge control circuit 10 will not be damaged. Similarly, even if a short circuit occurs inside the secondary secondary battery B2, the charge / discharge control circuit 10 is not damaged.

また、第１実施形態と同様に、例えば、過放電状態において放電制御スイッチがオフしている状態でも、第１二次電池Ｂ１と第２二次電池Ｂ２は第１定電流ダイオード１４５及び第２定電流ダイオード１４６を介して接続されているので、第１二次電池Ｂ１と第２二次電池Ｂ２の電圧のバランスを取ることができる、という効果もある。 Further, as in the first embodiment, for example, even when the discharge control switch is off in the over-discharged state, the primary secondary battery B1 and the secondary secondary battery B2 have the first constant current diode 145 and the second. Since it is connected via the constant current diode 146, there is also an effect that the voltages of the primary secondary battery B1 and the secondary secondary battery B2 can be balanced.

以上、本発明の実施形態を説明したが、これら実施形態の構成に限定されるものではなく、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。例えば、二次電池の負極側に充放電スイッチを備え、二次電池の正極側を共通にしたバッテリ装置として説明したが、二次電池の正極側に充放電スイッチを備え、二次電池の負極側を共通にしたバッテリ装置としても良い。また例えば、放電制御スイッチＳＤ１と放電制御スイッチＳＤ２は共通に制御され、充電制御スイッチＳＣ１と充電制御スイッチＳＣ２は共通に制御するように構成したが、夫々単独に制御するような回路構成にしても良い。 Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of these embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. For example, the battery device is described as a battery device in which a charge / discharge switch is provided on the negative side of the secondary battery and the positive side of the secondary battery is shared. It may be a battery device having a common side. Further, for example, the discharge control switch SD1 and the discharge control switch SD2 are controlled in common, and the charge control switch SC1 and the charge control switch SC2 are controlled in common. good.

１…バッテリ装置、１０…充放電制御回路、１１…電圧検出部、１１１…第１電圧検出部、１１２…第２電圧検出部、１２…制御部、１３…ドライバ、１４…接続回路、ＳＤ１…放電制御スイッチ、ＳＣ１…充電制御スイッチ、ＳＤ２…放電制御スイッチ、ＳＣ２…充電制御スイッチ 1 ... Battery device, 10 ... Charge / discharge control circuit, 11 ... Voltage detection unit, 111 ... First voltage detection unit, 112 ... Second voltage detection unit, 12 ... Control unit, 13 ... Driver, 14 ... Connection circuit, SD1 ... Discharge control switch, SC1 ... Charge control switch, SD2 ... Discharge control switch, SC2 ... Charge control switch

Claims (3)

第１外部端子及び第２外部端子の間に互いに並列に接続された第１二次電池及び第２二次電池の充放電を制御する充放電制御回路であって、
前記第１二次電池の第１電極が接続される第１電源端子と、
前記第２二次電池の第１電極が接続される第２電源端子と、
前記第１二次電池の第２電極及び前記第２二次電池の第２電極がそれぞれ接続される第３電源端子と、
前記第１電源端子の電位と前記第３電源端子の電位とに基づいて、前記第１二次電池の電圧を検出する第１電圧検出部と、
前記第２電源端子の電位と前記第３電源端子の電位とに基づいて、前記第２二次電池の電圧を検出する第２電圧検出部と、
前記第１電源端子と前記第２電源端子を接続して、接続後の電位を出力する接続回路と、
前記接続回路から出力される電位と前記第３電源端子から供給される電位との電位差を電源電圧として動作し、前記第１電圧検出部による検出結果及び前記第２電圧検出部による検出結果に基づいて、前記第１二次電池及び前記第２二次電池の充放電を制御する制御部と、を備え
前記接続回路は、
第１端子が前記第１電源端子に接続され、第２端子が前記制御部に接続される第１抵抗と、
第１端子が前記第２電源端子に接続され、第２端子が前記制御部に接続される第２抵抗と、を備える充放電制御回路。 A charge / discharge control circuit that controls the charge / discharge of the primary secondary battery and the secondary secondary battery connected in parallel between the first external terminal and the second external terminal.
The first power supply terminal to which the first electrode of the first secondary battery is connected, and
A second power supply terminal to which the first electrode of the second secondary battery is connected, and
A third power supply terminal to which the second electrode of the primary secondary battery and the second electrode of the secondary secondary battery are connected, respectively.
A first voltage detection unit that detects the voltage of the primary secondary battery based on the potential of the first power supply terminal and the potential of the third power supply terminal.
A second voltage detection unit that detects the voltage of the secondary secondary battery based on the potential of the second power supply terminal and the potential of the third power supply terminal.
A connection circuit that connects the first power supply terminal and the second power supply terminal and outputs the potential after the connection, and
The potential difference between the potential output from the connection circuit and the potential supplied from the third power supply terminal is used as the power supply voltage, and is based on the detection result by the first voltage detection unit and the detection result by the second voltage detection unit. The connection circuit is provided with a control unit for controlling the charging and discharging of the primary secondary battery and the secondary secondary battery.
A first resistor whose first terminal is connected to the first power supply terminal and whose second terminal is connected to the control unit,
A charge / discharge control circuit including a second resistor whose first terminal is connected to the second power supply terminal and whose second terminal is connected to the control unit. 第１外部端子及び第２外部端子の間に互いに並列に接続された第１二次電池及び第２二次電池の充放電を制御する充放電制御回路であって、
前記第１二次電池の第１電極が接続される第１電源端子と、
前記第２二次電池の第１電極が接続される第２電源端子と、
前記第１二次電池の第２電極及び前記第２二次電池の第２電極がそれぞれ接続される第３電源端子と、
前記第１電源端子の電位と前記第３電源端子の電位とに基づいて、前記第１二次電池の電圧を検出する第１電圧検出部と、
前記第２電源端子の電位と前記第３電源端子の電位とに基づいて、前記第２二次電池の電圧を検出する第２電圧検出部と、
前記第１電源端子と前記第２電源端子を接続して、接続後の電位を出力する接続回路と、
前記接続回路から出力される電位と前記第３電源端子から供給される電位との電位差を電源電圧として動作し、前記第１電圧検出部による検出結果及び前記第２電圧検出部による検出結果に基づいて、前記第１二次電池及び前記第２二次電池の充放電を制御する制御部と、を備え
前記接続回路は、
アノード端子が前記第１電源端子に接続され、カソード端子が前記制御部に接続される第１定電流ダイオードと、
アノード端子が前記第２電源端子に接続され、カソード端子が前記制御部に接続される第２定電流ダイオードと、を備える充放電制御回路。 A charge / discharge control circuit that controls the charge / discharge of the primary secondary battery and the secondary secondary battery connected in parallel between the first external terminal and the second external terminal.
The first power supply terminal to which the first electrode of the first secondary battery is connected, and
A second power supply terminal to which the first electrode of the second secondary battery is connected, and
A third power supply terminal to which the second electrode of the primary secondary battery and the second electrode of the secondary secondary battery are connected, respectively.
A first voltage detection unit that detects the voltage of the primary secondary battery based on the potential of the first power supply terminal and the potential of the third power supply terminal.
A second voltage detection unit that detects the voltage of the secondary secondary battery based on the potential of the second power supply terminal and the potential of the third power supply terminal.
A connection circuit that connects the first power supply terminal and the second power supply terminal and outputs the potential after the connection, and
The potential difference between the potential output from the connection circuit and the potential supplied from the third power supply terminal is used as the power supply voltage, and is based on the detection result by the first voltage detection unit and the detection result by the second voltage detection unit. The connection circuit is provided with a control unit for controlling the charging and discharging of the primary secondary battery and the secondary secondary battery.
A first constant current diode whose anode terminal is connected to the first power supply terminal and whose cathode terminal is connected to the control unit.
A charge / discharge control circuit including a second constant current diode in which an anode terminal is connected to the second power supply terminal and a cathode terminal is connected to the control unit. 請求項１または２に記載の充放電制御回路と、
前記第１二次電池と、
前記第２二次電池と、
前記第１外部端子と、
前記第２外部端子と、
前記制御部によって制御され、前記第１二次電池に対する充放電電流を制御する第１充放電制御スイッチと、
前記制御部によって制御され、前記第２二次電池に対する充放電電流を制御する第２充放電制御スイッチと
を備えるバッテリ装置。 The charge / discharge control circuit according to claim 1 or 2.
With the primary secondary battery
With the second secondary battery
With the first external terminal
With the second external terminal
A first charge / discharge control switch that is controlled by the control unit and controls the charge / discharge current for the primary secondary battery.
A battery device including a second charge / discharge control switch that is controlled by the control unit and controls a charge / discharge current for the secondary secondary battery.
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