WO2025112876A1 - 电池模块检测系统及其方法 - Google Patents

电池模块检测系统及其方法 Download PDF

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Publication number
WO2025112876A1
WO2025112876A1 PCT/CN2024/121611 CN2024121611W WO2025112876A1 WO 2025112876 A1 WO2025112876 A1 WO 2025112876A1 CN 2024121611 W CN2024121611 W CN 2024121611W WO 2025112876 A1 WO2025112876 A1 WO 2025112876A1
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WO
WIPO (PCT)
Prior art keywords
battery module
detection
voltage
power supply
insulation
Prior art date
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Pending
Application number
PCT/CN2024/121611
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English (en)
French (fr)
Inventor
陈买林
王鹏
李志强
汪三林
王成志
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BYD Co Ltd
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BYD Co Ltd
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Publication of WO2025112876A1 publication Critical patent/WO2025112876A1/zh
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • 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

Definitions

  • the present application relates to the field of power electronics technology, and in particular to a battery module detection system and method thereof.
  • the power battery pack is composed of one or more battery modules, each of which includes multiple battery cells.
  • the outer shell of the power battery pack is insulated from the battery modules in the power battery pack, and the outer shell of each battery module is insulated from the multiple battery cells in the battery module.
  • the battery cells inside the battery module are prone to insulation abnormalities such as leakage, arcing or micro-short circuits.
  • insulation abnormalities such as leakage, arcing or micro-short circuits.
  • the present application provides a battery module detection system, the system comprising a control circuit and a detection circuit, the detection circuit being electrically connected to a housing of the battery module, the detection circuit comprising a resistance unit, the control circuit being connected to the detection circuit, and the control circuit being used to: control the transmission of a power supply voltage to the detection circuit, and obtain a detection voltage fed back by the detection circuit; determine detection parameters inside the battery module based on the power supply voltage, the detection voltage and the resistance value of the resistance unit, and determine whether there is an insulation abnormality inside the battery module based on the detection parameters inside the battery module.
  • the power supply voltage includes a first power supply voltage
  • the detection voltage includes a first detection voltage fed back by the detection circuit
  • the detection parameter inside the battery module includes an insulation resistance of the battery module
  • the control circuit is used to determine the insulation resistance of the battery module based on the first power supply voltage, the first detection voltage, and the resistance value of the resistance unit, and to determine whether there is an insulation abnormality between the multiple battery cells inside the battery module and the outer casing of the battery module based on the insulation resistance of the battery module and a preset resistance threshold.
  • the power supply voltage includes a first power supply voltage and a second power supply voltage
  • the detection voltage includes a first detection voltage and a second detection voltage
  • the first detection voltage is the detection voltage fed back by the detection circuit when the power supply voltage is the first power supply voltage
  • the second detection voltage is the detection voltage fed back by the detection circuit when the power supply voltage is the second power supply voltage
  • the detection parameters inside the battery module include the insulation resistance of the battery module
  • the above-mentioned control circuit is used to determine the insulation resistance of the above-mentioned battery module based on the above-mentioned first power supply voltage, the above-mentioned second power supply voltage, the above-mentioned first detection voltage, the above-mentioned second detection voltage, and the resistance value of the above-mentioned resistance unit, and determine whether there is an insulation abnormality between the multiple battery cells inside the above-mentioned battery module and the outer casing of the above-mentioned battery module based on the insulation resistance of the above-mentioned battery module and a preset resistance threshold.
  • the detection parameter inside the battery module further includes an insulation voltage of the battery module
  • the control circuit is used to determine the insulation voltage of the battery module based on the first power supply voltage, the second power supply voltage, the first detection voltage, the second detection voltage, and the resistance value of the resistance unit.
  • the insulation resistance is less than the preset resistance threshold, the battery cell with insulation abnormality is determined from the multiple battery cells inside the battery module based on the insulation voltage of the battery module.
  • control circuit is used to determine the battery cell corresponding to the acquired target voltage threshold interval inside the battery module as a battery cell with insulation abnormality when the insulation resistance is less than the preset resistance threshold.
  • the resistor unit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor; one end of the first resistor is connected to the first port of the control circuit, the other end of the first resistor is respectively connected to one end of the second resistor, one end of the third resistor and one end of the fourth resistor, the other end of the second resistor is connected to the second port of the control circuit, the other end of the third resistor, the other end of the fourth resistor, the other end of the third resistor and one end of the fifth resistor are all grounded, and the other end of the fifth resistor is connected to the housing of the battery module;
  • the control circuit is used to transmit the power supply voltage through the first port and obtain the detection voltage through the second port.
  • the power supply voltage includes a first power supply voltage
  • the detection voltage includes a first detection voltage fed back by the detection circuit
  • the control circuit is used to determine the insulation resistance inside the battery module according to the first power supply voltage, the first detection voltage, and the resistance value of the resistance unit, including:
  • the control circuit is used to calculate the insulation resistance of the battery module according to the following formula:
  • R is the resistance value of the above-mentioned insulation resistor
  • U1 is the above-mentioned first detection voltage
  • V1 is the above-mentioned first power supply voltage
  • R1 is the resistance value of the above-mentioned first resistor
  • R2 is the resistance value of the above-mentioned second resistor
  • R3 is the resistance value of the above-mentioned third resistor
  • R4 is the resistance value of the above-mentioned fourth resistor
  • R5 is the resistance value of the above-mentioned fifth resistor.
  • the power supply voltage includes a first power supply voltage and a second power supply voltage
  • the detection voltage includes a first detection voltage and a second detection voltage
  • the control circuit is used to determine the insulation resistance of the battery module according to the first power supply voltage, the second power supply voltage, the first detection voltage, the second detection voltage, and the resistance value of the resistance unit, including:
  • the control circuit is used to calculate the insulation resistance of the battery module according to the following formula:
  • R is the resistance value of the above-mentioned insulation resistor
  • U1 is the above-mentioned first detection voltage
  • U2 is the above-mentioned second detection voltage
  • V1 is the above-mentioned first power supply voltage
  • V2 is the above-mentioned second power supply voltage
  • R1 is the resistance value of the above-mentioned first resistor
  • R2 is the resistance value of the above-mentioned second resistor
  • R3 is the resistance value of the above-mentioned third resistor
  • R4 is the resistance value of the above-mentioned fourth resistor
  • R5 is the resistance value of the above-mentioned fifth resistor.
  • the power supply voltage includes a first power supply voltage and a second power supply voltage
  • the detection voltage includes a first detection voltage and a second detection voltage
  • the control circuit is used to calculate the insulation voltage of the battery module according to the following formula:
  • Ux is the above-mentioned insulation voltage
  • U1 is the above-mentioned first detection voltage
  • U2 is the above-mentioned second detection voltage
  • V1 is the above-mentioned first power supply voltage
  • V2 is the above-mentioned second power supply voltage
  • R1 is the resistance value of the above-mentioned first resistor
  • R2 is the resistance value of the above-mentioned second resistor
  • R3 is the resistance value of the above-mentioned third resistor
  • R4 is the resistance value of the above-mentioned fourth resistor
  • R5 is the resistance value of the above-mentioned fifth resistor.
  • the detection circuit further includes a first capacitor and a second capacitor; the first capacitor is connected in parallel with the third resistor, one end of the second capacitor is connected to the other end of the fourth resistor, and the other end of the second capacitor is grounded.
  • the detection circuit further includes a first diode and a second diode; the anode of the first diode is connected to the first port of the control circuit, and the cathode of the first diode is connected to one end of the second resistor; the cathode of the second diode is connected to the second port of the control circuit, and the anode of the second diode is grounded.
  • the present application further provides a battery module detection method, the method being performed by a battery module detection system, the battery module detection system comprising a control circuit and a detection circuit connected to the control circuit, the detection circuit being electrically connected to a housing of the battery module and comprising a resistance unit, the method comprising:
  • the control circuit controls the power supply voltage to be transmitted to the detection circuit, and obtains the detection voltage fed back by the detection circuit;
  • the control circuit determines the detection parameters inside the battery module according to the power supply voltage, the detection voltage and the resistance value of the resistance unit, and determines whether there is an insulation abnormality inside the battery module according to the detection parameters inside the battery module.
  • the power supply voltage includes a first power supply voltage
  • the detection voltage includes a first detection voltage fed back by the detection circuit
  • the detection parameter inside the battery module includes an insulation resistance of the battery module
  • the method of determining the detection parameters inside the battery module according to the power supply voltage, the detection voltage and the resistance value of the resistance unit, and determining whether there is an insulation abnormality inside the battery module according to the detection parameters inside the battery module includes:
  • the insulation resistance of the battery module is determined based on the first power supply voltage, the first detection voltage and the resistance value of the resistance unit, and based on the insulation resistance of the battery module and a preset resistance threshold, it is determined whether there is an insulation abnormality between the multiple battery cells inside the battery module and the outer casing of the battery module.
  • the power supply voltage includes a first power supply voltage and a second power supply voltage
  • the detection voltage includes a first detection voltage and a second detection voltage
  • the first detection voltage is the detection voltage fed back by the detection circuit when the power supply voltage is the first power supply voltage
  • the second detection voltage is the detection voltage fed back by the detection circuit when the power supply voltage is the second power supply voltage
  • the detection parameters inside the battery module include the insulation resistance of the battery module
  • Determining detection parameters inside the battery module according to the power supply voltage, the detection voltage, and the resistance value of the resistance unit, and determining whether there is an insulation abnormality inside the battery module according to the detection parameters inside the battery module including:
  • the insulation resistance of the battery module is determined according to the first power supply voltage, the second power supply voltage, the first detection voltage, the second detection voltage, and the resistance value of the resistance unit, and the insulation resistance of the battery module is determined according to the insulation resistance of the battery module and a preset resistance threshold. Whether there is any insulation abnormality between the multiple battery cells inside the battery module and the outer shell of the battery module.
  • the power supply voltage includes a first power supply voltage and a second power supply voltage
  • the detection voltage includes a first detection voltage and a second detection voltage
  • the detection parameter inside the battery module also includes an insulation voltage of the battery module
  • Determining detection parameters inside the battery module according to the power supply voltage, the detection voltage, and the resistance value of the resistance unit, and determining whether there is an insulation abnormality inside the battery module according to the detection parameters inside the battery module including:
  • the control circuit is used to determine the insulation voltage of the battery module based on the first power supply voltage, the second power supply voltage, the first detection voltage, the second detection voltage, and the resistance value of the resistance unit.
  • the insulation resistance is less than the preset resistance threshold, the battery cell with insulation abnormality is determined from the multiple battery cells inside the battery module based on the insulation voltage of the battery module.
  • determining a battery cell having insulation abnormality from a plurality of battery cells inside the battery module according to the insulation voltage of the battery module includes:
  • the battery cell in the battery module corresponding to the acquired target voltage threshold interval is determined as a battery cell with insulation abnormality.
  • the present application further provides a non-volatile computer-readable storage medium, which stores a computer program or computer instructions, and the aforementioned computer program or computer instructions are executed by a processor to implement any of the aforementioned methods in the aforementioned second aspect.
  • the present application further provides a computer program product.
  • the computer program product is executed by a processor, any of the aforementioned methods in the above-mentioned second aspect will be executed.
  • the present application further provides a battery information collector, the battery information collector comprising the battery module detection system of the first aspect.
  • the present application also provides a power supply device, including a battery module, a battery management system and the battery module detection system of the first aspect or the battery information collector of the fifth aspect; the battery module detection system is used to detect the insulation abnormality inside the battery module, and generate a detection result based on the insulation abnormality inside the battery module, and send the detection result to the battery management system; the battery management system is used to output an abnormal prompt or a normal prompt based on the detection result.
  • the battery module includes at least two battery cells connected in series.
  • the present application further provides an electric device, which includes the power supply device in the sixth aspect.
  • FIG1 is a schematic diagram of a structure of a power battery pack provided in an embodiment of the present application.
  • FIG2 is another schematic diagram of the structure of a power battery pack provided in an embodiment of the present application.
  • FIG3 is a schematic diagram of a battery module detection system provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of a structure of a detection circuit provided in an embodiment of the present application.
  • FIG5 is another schematic diagram of the structure of the detection circuit provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of a flow chart of a battery module detection method provided by the present application.
  • FIG7 is a schematic diagram of a structure of a power supply device provided in an embodiment of the present application.
  • FIG8 is a schematic diagram of a structure of a battery information collector provided in an embodiment of the present application.
  • FIG. 9 is a schematic diagram of the structure of an electric device provided in an embodiment of the present application.
  • 300-battery module detection system 300-battery module detection system, 301-control circuit, 302-detection circuit, 320-battery module, 330-housing, 310-power battery pack, (C 1 )-first capacitor, (C 2 )-second capacitor, (D 1 )-first diode, (D 2 )-second diode.
  • the power battery pack is the power source of new energy vehicles, which is used to store electrical energy and provide electrical energy to new energy vehicles.
  • the output voltage of the power battery pack exceeds 300 volts, so multiple cells can be connected in series or in parallel to form a battery module, and then multiple battery modules can be connected in series or in parallel to form a power battery pack to increase the output voltage of the power battery pack.
  • the battery module may be a battery module composed of a plurality of battery cells.
  • the battery module may be a battery pack formed by encapsulating a plurality of battery cells.
  • the battery module may be composed of a plurality of battery cells directly encapsulated in a chassis. It is to be understood that this is only an example and does not constitute a limitation on the embodiments of the present application.
  • the present application provides a battery module detection system and method, which can detect insulation abnormalities inside the battery module and ensure the safety and stability of the battery module.
  • the battery module detection system can detect the insulation abnormality inside the battery module and locate the abnormal insulation of the battery module.
  • the battery module with insulation abnormality is conducive to timely early warning when there is insulation abnormality inside the battery module, so as to ensure the safety and effectiveness of the battery module power battery pack and the vehicle.
  • the battery module detection system includes a control circuit and a detection circuit, and the detection circuit is connected to the control circuit and the battery module to be detected respectively.
  • the control circuit can generate and transmit the power supply voltage to the detection circuit
  • the detection circuit includes a resistor unit, and the detection circuit generates the detection voltage based on the resistor unit, the power supply voltage and the battery module; the detection circuit can feed back the generated detection voltage to the control circuit.
  • the control circuit calculates the detection parameters inside the battery module according to the received detection voltage, the generated power supply voltage and the resistance value of the resistor unit.
  • the detection parameter can be understood as a parameter for characterizing the insulation abnormality between the multiple cells inside the battery module and the outer shell of the battery module. Therefore, the control circuit can determine the insulation abnormality inside the battery module according to the above detection parameters, which is conducive to timely early warning when there is insulation abnormality inside the battery module, and then it can be convenient for maintenance personnel to check the abnormality of the battery module, ensuring the safety and effectiveness of the battery module power battery pack and the vehicle.
  • FIG. 1 is a schematic diagram of a structure of a power battery pack provided in an embodiment of the present application.
  • the power battery pack 100 includes a housing 110 and a plurality of battery modules.
  • the housing 110 as a protective structure of the power battery pack 100, can fix and support the plurality of battery modules therein.
  • the plurality of battery modules include a battery module 120 and a battery module 130, and the plurality of battery modules are connected in series through BC poles.
  • the BC poles can be understood as connection terminals for connecting external conductors to the battery module, for example, the BC poles of the battery module 130 are connected to the BC poles of the battery module 120, so that the battery module 130 is electrically connected to the battery module 120.
  • each battery module in FIG. 1 includes a housing and a plurality of battery cells BT1, BT2, BT3, ..., which are connected in series.
  • the housing of the battery module is used to encapsulate and protect the plurality of battery cells in the battery module, so as to avoid short circuits between different battery modules and affect the normal operation of the power battery pack 100.
  • the voltage of each of the above-mentioned battery modules is equal to the sum of the voltages of the multiple battery cells connected in series within the battery module.
  • the voltage of the power battery pack 100 is equal to the sum of the voltages of the multiple battery modules connected in series within the power battery pack 100.
  • the outer shell 110 of the power battery pack 100 is insulated from the multiple battery modules, which can prevent the outside world from interfering with the multiple battery modules inside the power battery pack 100.
  • the outer shell 110 can keep the multiple battery modules safe and effective by being insulated from the multiple battery modules.
  • the outer shell of each of the above-mentioned battery modules is insulated from the multiple battery cells inside the battery module, which can prevent the outside world from causing adverse effects on the multiple internal battery cells, and at the same time prevent mutual interference between different battery modules.
  • the battery cell of the battery module 120 in Figure 1 fails, since the battery module 120 is insulated from the battery module 130 through its outer shell 140, and the battery module 130 is insulated from the battery module 120 through its outer shell 150, the failure of the battery module 120 will not affect the normal operation of the battery module 130.
  • the insulation performance between the power battery pack shell and the battery module can be understood as the equivalent insulation resistance between the power battery pack shell and the battery module.
  • the equivalent insulation resistance between the power battery pack shell and the battery module refers to the insulation performance between the power battery pack shell and the battery module.
  • the insulation performance between the outer shell of the battery module and the internal battery cells can also be characterized by the equivalent insulation resistance between the outer shell of the battery module and the internal battery cells.
  • the leaked liquid will cause the outer shell of the power battery pack and the battery module to no longer be insulated, that is, the insulation performance is reduced.
  • the equivalent insulation resistance between the outer shell of the power battery pack and the battery module can be tested.
  • the equivalent insulation resistance between the shell of the power battery pack and the multiple battery modules can be characterized by the resistance between the busbar of the power battery pack and the shell.
  • the busbar of the power battery pack can be understood as a bus for the power battery pack to supply power or charge.
  • the present application embodiment is illustrated with reference to the power battery pack 200 of FIG. 2 .
  • FIG 2 is another structural schematic diagram of the power battery pack provided in an embodiment of the present application.
  • the total negative busbar of the power battery pack 200 is connected to the BC pole of the battery module 220, which is equivalent to the negative pole of the power battery pack 200;
  • the total positive busbar of the power battery pack 200 is connected to the BC pole of the battery module 230, which is equivalent to the positive pole of the power battery pack 200.
  • the power battery pack 200 also includes a resistor Ra, a resistor Rb, a resistor Rc and a resistor Rd connected in series.
  • the equivalent insulation resistance between the outer shell 210 of the power battery pack 200 and the multiple battery modules can be characterized by the resistance Rp between the total positive busbar of the power battery pack 200 and the outer shell 210, and the resistance Rn between the total negative busbar and the outer shell 210.
  • the power battery pack 200 can detect the above-mentioned resistance Rp and resistance Rn through the insulation detection circuit 240 to determine the equivalent insulation resistance between the outer shell 210 and the battery module 220 or the battery module 230, and then timely issue an early warning when one or more battery modules in the power battery pack 200 have insulation abnormalities.
  • the battery cells inside the battery module usually do not affect the outside of the battery module when a failure occurs.
  • the leaked liquid will usually only remain inside the battery module, resulting in a decrease in the insulation performance inside the battery module, and will not penetrate to the outside of the battery module, and will not affect the insulation performance between the power battery pack shell and the battery module.
  • the insulation detection circuit 240 shown in Figure 2 can only be used to detect the equivalent insulation resistance between the shell 210 of the power battery pack 200 and multiple battery modules, but cannot detect the insulation performance inside any battery module.
  • an abnormality occurs in the battery cell inside the battery, resulting in a decrease in the insulation performance inside the battery module, it is impossible to issue a warning in time, and there is a safety hazard.
  • an embodiment of the present application provides a battery module detection system, which can detect the insulation performance inside the battery module, so as to provide timely warning when insulation abnormalities occur in the battery module cells, resulting in a decrease in the equivalent insulation resistance between the battery module casing and the cells, thereby improving the safety and stability of the power battery pack.
  • FIG. 3 is a schematic diagram of a battery module detection system provided in an embodiment of the present application.
  • the battery module detection system 300 shown in FIG. 3 is disposed in a power battery pack 310 and is used to detect the battery module 320 in the power battery pack 310.
  • the internal insulation abnormality is detected.
  • the battery module 320 includes multiple cells such as cell BT1, cell BT2, cell BT3, ..., etc. Further, the insulation abnormality inside the battery module 320 can be understood as a situation where one or more of the multiple cells inside the battery module 320 are abnormal, causing the battery module 320 to fail to work normally.
  • the equivalent insulation resistance between the battery cell BT1 and the outer shell 330 of the battery module 320 decreases, that is, the battery cell BT1 is abnormal.
  • the equivalent insulation resistance between the battery cell BT2 and the above-mentioned outer shell 330 will also decrease, that is, the battery cell BT2 is abnormal.
  • the equivalent insulation resistance between the battery cell BT3 and the above-mentioned outer shell 330 will also decrease, that is, the battery cell BT2 is abnormal.
  • any abnormality in any of the batteries in the above-mentioned battery module 320 will cause the battery module 320 to fail to work normally, that is, an insulation abnormality occurs inside the battery module 320.
  • an insulation abnormality occurs inside the battery module 320.
  • the above-mentioned insulation abnormalities of battery cell leakage, arcing, and micro-short circuit are only examples, and other insulation abnormalities may also occur in the battery module 320, which will not be illustrated one by one in this application.
  • the battery module detection system 300 of the embodiment of the present application can obtain the detection parameters inside the battery module 320 by detecting the battery module 320.
  • the detection parameters inside the battery module 320 can be understood as parameters used to characterize whether there is abnormal operation of the battery cell inside the battery module 320, and the battery module detection system 300 can determine whether there is abnormal operation of the battery cell inside the battery module 320 based on the detection parameters, and then determine the insulation abnormality inside the battery module 320.
  • the battery module detection system 300 can first obtain the detection parameters inside the battery module 320, and then determine the insulation abnormality inside the battery module 320 according to the detection parameters.
  • the specific process of obtaining the detection parameters inside the battery module 320 is explained in the following content of the embodiment of the present application.
  • the voltage inside the battery module 320 will also change.
  • the multiple cells of the battery module 320 are insulated from the outer shell 330, and the voltage inside the battery module 320 is distributed between the multiple cells connected in series, and the outer shell 330 is not charged, that is, the voltage of the outer shell 330 is 0.
  • the cell BT1 of the battery module 320 leaks, the cell BT1 is electrically connected to the outer shell 330 through the leaked liquid, and the voltage inside the battery module 320 is distributed between the outer shell 330 and the multiple cells connected in series. At this time, the outer shell 330 is charged, and the voltage of the outer shell 330 is no longer 0.
  • the voltage inside the battery module 320 can be used to characterize the insulation abnormality inside the battery module 320. Therefore, the battery module detection system 300 of the embodiment of the present application can detect the voltage change inside the battery module 320, so as to use the voltage change inside the battery module 320 as the above detection parameter.
  • the battery module detection system 300 includes a control circuit 301 and a detection circuit 302, and the detection circuit 302 is connected to the battery module 320 and the control circuit 301, respectively.
  • the voltage of the outer shell 330 of the battery module 320 will also change, that is, the voltage change of the outer shell 330 can reflect the voltage change inside the battery module 320.
  • the battery module detection system 300 can be connected to the outer shell 330 of the battery module 320 through the detection circuit 302, so as to obtain the detection parameters when the insulation abnormality occurs inside the battery module 320, resulting in the voltage change of the outer shell 330, and then determine the insulation abnormality inside the battery module 320 according to the detection parameters.
  • the detection circuit 302 can also receive control signals while detecting the internal voltage of the battery module 320.
  • the power supply voltage generated by the circuit 301 generated by the circuit 301.
  • the detection circuit 302 can generate a corresponding detection voltage under the action of the voltage of the housing 330 and the power supply voltage.
  • the detection circuit 302 includes a resistance unit, which can generate different detection voltages under the action of different voltages of the housing 330 and the power supply voltage.
  • the detection circuit 302 can feed back the detection voltage to the control circuit 301, so that the control circuit 301 can infer the internal voltage of the battery module 320 based on the generated power supply voltage, the received detection voltage and the resistance value of the resistance unit in the detection circuit 302, and then determine the insulation abnormality inside the battery module 320.
  • the control circuit 301 may receive a power supply signal and work based on the power supply signal.
  • the power supply signal may be understood as the DC operating voltage of the control circuit 301.
  • the control circuit 301 may receive a DC voltage of 3.3 volts as the power supply signal.
  • the power supply signal may be provided to the control circuit 301 by an external DC power supply, and the present application does not limit this.
  • the control circuit 301 may generate a power supply voltage according to the power supply signal. Specifically, the control circuit 301 may amplify the power supply signal according to a preset amplification factor to generate the power supply voltage.
  • the amplification factor may be an integer or fraction greater than 0.
  • the control circuit 301 may preset the amplification factor to 1, and then amplify the power supply signal according to the amplification factor to generate a power supply voltage of 3.3 volts.
  • the preset magnification factor can be changed to generate a corresponding power supply voltage, and the power supply voltage is transmitted to the detection circuit 302, so that the detection circuit 302 generates a corresponding detection voltage under the action of the power supply voltage and the voltage of the housing 330, and feeds it back to the control circuit 301.
  • the insulation performance between the outer shell 330 of the battery module 320 and the internal multiple battery cells can be characterized by the insulation resistance inside the battery module 320.
  • the insulation resistance inside the battery module 320 can be understood as the equivalent resistance between the multiple battery cells inside the battery module 320 and the outer shell 330.
  • the multiple battery cells in the battery module 320 are insulated from the outer shell 330, and the equivalent resistance between the multiple battery cells and the outer shell 330 is infinite, that is, the insulation resistance inside the battery module 320 is infinite.
  • the battery module detection system 300 can determine the insulation abnormality between the multiple battery cells in the battery module 320 and the outer shell 330 by detecting the insulation resistance between the outer shell 330 and the internal battery cell.
  • the control circuit 301 may amplify the power supply signal according to a preset amplification factor to generate a first power supply voltage, and then transmit the first power supply voltage to the detection circuit 302.
  • the detection circuit 302 may generate a first detection voltage under the action of the first power supply voltage and the voltage of the housing 330, and feed it back to the control circuit 301. Further, after receiving the first detection voltage, the control circuit 301 calculates the insulation resistance inside the battery module 320 in combination with the first power supply voltage, the first detection voltage and the resistance value of the resistance unit in the detection circuit 302.
  • FIG. 4 is a schematic diagram of a structure of a detection circuit provided in an embodiment of the present application.
  • the resistance unit of the detection circuit 400 includes a first resistor R1 , a second resistor R2 , a third resistor R3 , a fourth resistor R4 and a fifth resistor R5 .
  • one end of the first resistor R1 is connected to the first port a1 of the control circuit 410
  • the other end of the first resistor R1 is respectively connected to one end of the second resistor R2
  • the other end of the second resistor R2 is connected to the second port a2 of the control circuit 410
  • the other end of the third resistor R3 is grounded
  • the other end of the fourth resistor R4 is respectively connected to the other end of the third resistor R3 and one end of the fifth resistor R5
  • the other end of the fifth resistor R5 is connected to the housing 430 of the battery module 420.
  • the control circuit 410 can transmit the first power supply voltage to the detection circuit 400 through the first port a1.
  • the detection circuit 400 is connected to the housing 430, and can generate a corresponding first detection signal under the action of the voltage of the housing 430 and the first power supply voltage. It can be seen from the above that the first detection voltage is related to the first power supply voltage, the voltage inside the battery module 420, and the resistance values of the above-mentioned resistors. Further, the detection circuit 400 can feed back the first detection voltage to the control circuit 410 through the second port a2 of the control circuit 410.
  • the first detection voltage U1 can be represented by the following formula (1):
  • R is the resistance of the insulation resistor inside the battery module 420
  • U1 is the first detection voltage
  • V1 is the first power supply voltage
  • R1 is the resistance of the first resistor
  • R2 is the resistance of the second resistor
  • R3 is the resistance of the third resistor
  • R4 is the resistance of the fourth resistor
  • R5 is the resistance of the fifth resistor.
  • control circuit 410 may be configured to calculate the insulation resistance R inside the battery module 420 according to the following formula (2) after receiving the first detection voltage U1 fed back by the detection circuit 400:
  • R is the resistance of the insulation resistor inside the battery module 420
  • U1 is the first detection voltage
  • V1 is the first power supply voltage
  • R1 is the resistance of the first resistor
  • R2 is the resistance of the second resistor
  • R3 is the resistance of the third resistor
  • R4 is the resistance of the fourth resistor
  • R5 is the resistance of the fifth resistor.
  • control circuit 410 can generate and transmit a first power supply voltage to the detection circuit 400, and receive a first detection signal fed back by the detection circuit 400, and then calculate the insulation resistance inside the battery module 420, that is, the above-mentioned detection parameters, based on the first power supply voltage, the first detection signal and the resistance values of the resistance units in the detection circuit 400, and then determine the insulation abnormality between the multiple battery cells inside the battery module 420 and the outer shell 430 of the battery module 420 based on the detection parameters.
  • the control circuit 410 shown in FIG. 4 can calculate the insulation resistance inside the battery module 420 according to the above formula (2), and can also calculate the above insulation resistance according to the following method.
  • the control circuit 410 can generate a first power supply voltage and a second power supply voltage according to a preset amplification factor, and then transmit the first power supply voltage and the second power supply voltage to the detection circuit 400 respectively.
  • the detection circuit 400 can generate a first detection voltage under the action of the first power supply voltage and the voltage of the outer shell 430, and feed it back to the above control circuit 410.
  • the detection circuit 400 can also generate a second detection voltage under the action of the second power supply voltage and the voltage of the outer shell 430, And feed back to the control circuit 410.
  • the control circuit 410 calculates the insulation resistance inside the battery module 420 by combining the first power supply voltage, the second power supply voltage, the first detection voltage, the second detection voltage and the resistance value of the resistance unit in the detection circuit 400.
  • the control circuit 410 shown in FIG. 4 After the control circuit 410 shown in FIG. 4 generates the first power supply voltage, it can transmit the first power supply voltage to the detection circuit 400 through the first port a1.
  • the detection circuit 400 is connected to the housing 430, and can generate a corresponding first detection signal under the action of the voltage of the housing 430 and the first power supply voltage.
  • the first detection voltage is related to the first power supply voltage, the voltage inside the battery module 420, and the resistance values of the above-mentioned resistors. Further, the detection circuit 400 can feedback the first detection voltage through the second port a2 of the control circuit 410.
  • the control circuit 410 can generate a second power supply voltage and transmit the second power supply voltage to the detection circuit 400 through the first port a1.
  • the detection circuit 400 can generate a corresponding second detection signal under the action of the voltage of the housing 430 and the second power supply voltage.
  • the second detection voltage is related to the second power supply voltage, the voltage inside the battery module 420, and the resistance values of the above-mentioned resistors.
  • the detection circuit 400 may feed back the second detection voltage through the second port a2 of the control circuit 410 .
  • the first detection voltage fed back by the detection circuit 400 can be represented by the above formula (3):
  • U1 is the first detection voltage
  • V1 is the first power supply voltage
  • R1 is the resistance value of the first resistor
  • R2 is the resistance value of the second resistor
  • R3 is the resistance value of the third resistor
  • R4 is the resistance value of the fourth resistor
  • R5 is the resistance value of the fifth resistor
  • Ux is the voltage inside the battery module 420.
  • the second detection voltage can be represented by the following formula (4):
  • U2 is the second detection voltage
  • V2 is the second power supply voltage
  • R1 is the resistance value of the first resistor
  • R2 is the resistance value of the second resistor
  • R3 is the resistance value of the third resistor
  • R4 is the resistance value of the fourth resistor
  • R5 is the resistance value of the fifth resistor
  • Ux is the voltage inside the battery module 420.
  • control circuit 410 may be configured to calculate the insulation resistance R inside the battery module 420 according to the following formula (5) after receiving the first detection voltage U1 and the second detection voltage U2 fed back by the detection circuit 400:
  • R is the resistance value of the insulation resistance inside the battery module 420
  • U1 is the first detection voltage
  • U2 is the second detection voltage
  • V1 is the first power supply voltage
  • V2 is the second power supply voltage
  • R1 is the resistance value of the first resistor
  • R2 is the resistance value of the second resistor
  • R3 is the resistance value of the third resistor
  • R4 is R5 is the resistance value of the fourth resistor
  • R6 is the resistance value of the fifth resistor.
  • control circuit can generate and transmit a first power supply voltage and a second power supply voltage to the detection circuit respectively, and receive a first detection signal and a second detection signal respectively fed back by the detection circuit, and then calculate the insulation resistance inside the battery module, that is, the above-mentioned detection parameters, according to the first power supply voltage, the second power supply voltage, the first detection signal, the second detection signal and the various resistance values of the resistance unit in the detection circuit, and then determine the insulation abnormality between the multiple battery cells inside the battery module and the outer casing of the battery module according to the detection parameters.
  • the control circuit after the control circuit calculates the insulation resistance inside the battery module according to the above content, it can further determine the insulation abnormality between the multiple battery cells inside the battery module and the outer shell according to the preset resistance threshold and the comparison result of the insulation resistance.
  • the above resistance threshold can be understood as the minimum value of the insulation resistance inside the battery module when there is no insulation abnormality inside the battery module. That is to say, when the insulation resistance inside the battery module is less than the resistance threshold, it indicates that there is an insulation abnormality inside the battery module at this time.
  • the resistance threshold can be 1 megohm. When the insulation resistance calculated by the control circuit is less than 1 megohm, the control circuit can determine that there is an insulation abnormality between the multiple battery cells inside the battery module and the outer shell.
  • the battery module detection system connected to each battery module can be used to detect the detection parameters (such as the above-mentioned insulation resistance) inside the multiple battery modules to determine the battery module where the insulation abnormality occurs, thereby facilitating the repair and replacement of the faulty battery module.
  • the detection parameters such as the above-mentioned insulation resistance
  • the battery module detection system provided in the embodiments of the present application can not only identify the battery modules with insulation abnormalities in the power battery pack, but also identify the abnormally functioning battery cells in the battery modules with insulation abnormalities, so that maintenance personnel can directly repair and replace the abnormally functioning battery cells in the battery modules, thereby saving maintenance costs.
  • the battery module 420 includes a plurality of cells: cell BT1, cell BT2, and cell BT3, and the positive electrode of cell BT1 is connected to the negative electrode of cell BT2 at point a, the positive electrode of cell BT2 is connected to the negative electrode of cell BT3 at point b, and the positive electrode of cell BT3 is connected to the BC pole of the battery module 420 at point c. It should be noted that since the above-mentioned multiple cells are connected in series, the voltage distribution of the above-mentioned points a, b, and c conforms to the distribution characteristics of the battery series circuit.
  • the normal voltage at point a is equal to the output voltage of cell BT1, 5 volts
  • the normal voltage at point b is equal to the output voltage of cell BT1 and cell BT2, 10 volts
  • the normal voltage at point c is equal to the output voltage of cell BT1, cell BT2, and cell BT3, 15 volts.
  • the multiple cells of the battery module 420 are not abnormal, the multiple cells are insulated from the shell 430. At this time, the output voltage of the multiple cells is not loaded on the shell 430, and the voltage of the shell 430 is less than the preset shell voltage threshold.
  • the shell voltage threshold can be understood as the minimum voltage when the shell 430 is charged.
  • the voltage of the shell 430 is greater than the shell voltage threshold, which indicates that the shell 430 is charged. It is understandable that when the cell of the battery module 420 works abnormally, the abnormal cell is no longer insulated from the shell 430, that is, the abnormal cell will transmit the output voltage to the shell 430 through the insulation resistance.
  • the cell BT1 when the cell BT1 leaks, micro-short circuits, etc., the cell BT1 will be electrically connected to the shell 430 of the battery module 420 through the insulation resistance R, which can be equivalent to the output voltage of the cell BT1 (i.e., the normal voltage at point a) acting on the shell 430 through the insulation resistance.
  • the battery cell BT2 when the battery cell BT2 has abnormalities such as leakage, micro-short circuit, etc., the battery cell BT2 will be electrically connected to the outer shell 430 of the battery module 420 through the insulation resistor R, which can be equivalent to the output voltage of the battery cells BT1 and BT2 (i.e., the normal voltage at point b) acting on the outer shell 430 through the insulation resistor.
  • the battery cell BT3 When the battery cell BT3 has abnormalities such as leakage, micro-short circuit, etc., the battery cell BT3 will be electrically connected to the outer shell 420 through the insulation resistor R, which can be equivalent to the output voltage of the battery cells BT1, BT2 and BT3 (i.e., the normal voltage at point c) acting on the outer shell 430 through the insulation resistor.
  • the battery module detection system of the embodiment of the present application can be used.
  • the voltage inside the battery module 420 acting on the housing 430 is calculated, and the voltage is determined as the insulation voltage U x of the battery module 420.
  • the insulation voltage U x can be understood as when there is an insulation abnormality in a battery cell in the battery module 420, the abnormal battery cell causes the housing 430 to have a certain voltage, such as the output voltage of the battery cell BT1 or the output voltage of the battery cell BT1 and the battery cell BT2.
  • the control circuit 410 in order to determine whether an insulation abnormality occurs in the battery module 420 and to determine the abnormally working cell in the abnormal battery module 420, can calculate the insulation voltage and insulation resistance inside the battery module 420 according to the power supply voltage, the detection voltage and the resistance value of the resistance unit, that is, the detection parameters inside the battery module 420 include the insulation voltage and insulation resistance. Then, it is determined whether an insulation abnormality occurs inside the battery module 420 according to the insulation resistance, and then the cell with the insulation abnormality in the battery module 420 is determined according to the insulation equivalent voltage.
  • control circuit 410 calculates the insulation resistance inside the battery module 420, it can be known from the above content that when the insulation resistance is less than the preset resistance threshold, it can be determined that there is an insulation abnormality between the multiple battery cells inside the battery module 420 and the outer shell 430, that is, there is an abnormality in the operation of the battery cells in the multiple battery cells inside the battery module 420. Furthermore, the control circuit 410 can calculate the insulation voltage inside the battery module 420 based on the above-mentioned power supply voltage, detection voltage and the resistance value of the resistance unit of the detection circuit 400.
  • the control circuit 410 can calculate the above-mentioned insulation voltage according to the following content. First, after generating the first power supply voltage, the control circuit 410 can transmit the first power supply voltage to the detection circuit 400 through the first port a1.
  • the detection circuit 400 is connected to the housing 430, and can generate a corresponding first detection signal under the action of the voltage of the housing 430 and the first power supply voltage. It can be seen from the above content that the first detection voltage is related to the above-mentioned first power supply voltage, the voltage inside the battery module 420, and the resistance value of each of the above-mentioned resistors.
  • the detection circuit 400 can feedback the first detection voltage through the second port a2 of the control circuit 410. Then, after receiving the first detection voltage, the control circuit 410 can generate a second power supply voltage and transmit the second power supply voltage to the detection circuit 400 through the first port a1. The detection circuit 400 can generate a corresponding second detection signal under the action of the voltage of the housing 430 and the second power supply voltage. As can be seen from the above, the second detection voltage is related to the second power supply voltage, the voltage inside the battery module 420 and the resistance values of the resistors. Further, the detection circuit 400 can feed back the second detection voltage through the second port a2 of the control circuit 410.
  • the first detection voltage fed back by the detection circuit 400 can be represented by the above formula (3), and the second detection voltage can be represented by the above formula (4), which will not be elaborated in this application.
  • control circuit 410 may be configured to calculate the insulation voltage U x inside the battery module 420 according to the following formula (6) after receiving the first detection voltage U 1 and the second detection voltage U 2 fed back by the detection circuit 400 :
  • Ux is the insulation voltage
  • U1 is the first detection voltage
  • U2 is the second detection voltage
  • V1 is the first power supply voltage
  • V2 is the second power supply voltage
  • R1 is the resistance value of the first resistor
  • R2 is the resistance value of the second resistor
  • R3 is the resistance value of the third resistor
  • R4 is the resistance value of the fourth resistor
  • R5 is the resistance value of the fifth resistor.
  • the insulation voltage calculated by the control circuit 410 is less than the preset insulation voltage threshold.
  • the insulation voltage threshold can be understood as the insulation voltage of the battery module 420. The minimum value of the insulation voltage and the voltage acting on the shell when the battery cell is working abnormally. That is to say, when the insulation voltage calculated by the control circuit 410 is less than the above insulation voltage threshold, it can be determined that there is no abnormal operation of the battery cell in the battery module 420.
  • the control circuit 410 can determine the abnormal battery cell based on the calculated insulation voltage and the output voltages corresponding to multiple battery cells.
  • the control circuit 410 can pre-set multiple voltage threshold intervals.
  • the above-mentioned preset multiple voltage threshold intervals can be understood as multiple voltage threshold intervals corresponding to multiple cells in the battery module 420.
  • the battery module 420 shown in Figure 4 includes a cell BT1, a cell BT2 and a cell BT3. It can be seen from the above that when the output voltages of the above-mentioned multiple cells are all 5 volts, when the cell BT1 has an insulation abnormality, the output voltage of the cell BT1 acts on the housing 430 through the insulation resistance, and the calculated insulation voltage is close to the output voltage of the cell BT1, 5 volts.
  • the control circuit 410 can determine the voltage threshold interval corresponding to the cell BT1 as an interval with a mean of 5 volts, for example, 3 volts to 7 volts. It can be understood that when the insulation voltage of the battery module 420 is calculated to be equal to 6 volts, it can be determined that the cell BT1 of the battery module 420 is abnormal.
  • the control circuit 410 can determine the voltage threshold interval corresponding to the battery cell BT2 as an interval with a mean of 10 volts, for example, 8 volts to 12 volts. It can be understood that when the insulation voltage of the battery module 420 is calculated to be equal to 9 volts, it can be determined that the battery cell BT2 of the battery module 420 is abnormal.
  • the battery cell BT3 when the battery BT3 has an insulation abnormality, the battery cell BT3 is connected in series with the battery cell BT2 and the battery cell BT1, and the output voltages of the battery cells BT1, BT2 and BT3 are added together and act on the housing 430 through the insulation resistance. At this time, the calculated insulation voltage is close to the sum of the output voltages of the battery cells BT1, BT2 and BT3, which is 15 volts. Therefore, the control circuit 410 can determine the voltage threshold interval corresponding to the battery cell BT3 as an interval with a mean of 15 volts, for example, 13 volts to 17 volts. It can be understood that when the insulation voltage of the battery module 420 is calculated to be equal to 14 volts, it can be determined that the battery cell BT3 of the battery module 420 is abnormal.
  • the control circuit 410 can determine the voltage threshold interval corresponding to each battery cell according to the output voltage of each battery cell connected in series inside the battery module 420.
  • the voltage threshold intervals of the above-mentioned battery cell BT1, battery cell BT2 and battery cell BT3 are only used as examples, and this application does not illustrate them one by one. It should be noted that in order to avoid errors in judging abnormal working batteries, the control circuit 410 should ensure that the voltage threshold intervals corresponding to each battery cell do not overlap when presetting the voltage threshold intervals corresponding to each battery cell.
  • the control circuit 410 can determine a voltage threshold interval corresponding to the insulation voltage in the preset multiple voltage threshold intervals as the target voltage threshold interval.
  • the target voltage threshold interval can be understood as a voltage threshold interval including the calculated insulation voltage. For example, assuming that the voltage threshold interval corresponding to the battery cell BT1 is 3 volts to 7 volts, when the control circuit 410 calculates that the insulation voltage is 7 volts, it can be determined that the voltage threshold interval corresponding to the battery cell BT1 is 3 volts.
  • the target voltage threshold interval is 200 to 7 V.
  • the control circuit 410 may determine the battery cell corresponding to the target voltage threshold interval as the battery cell with insulation abnormality, that is, determine the battery cell BT1 as the battery cell with insulation abnormality.
  • FIG. 5 is another schematic diagram of the structure of the detection circuit provided in the embodiment of the present application.
  • the detection circuit 500 also includes a first capacitor C1 and a second capacitor C2 .
  • the first capacitor C1 is connected in parallel with the third resistor R3
  • one end of the second capacitor C2 is connected to the other end of the fourth resistor R4
  • the other end of the second capacitor C2 is grounded.
  • the first capacitor C1 is a filter capacitor, which can filter out interference signals in the detection circuit 500 to avoid interference with the detection parameters.
  • the second capacitor C2 is a parasitic capacitor in the detection circuit 500.
  • the detection circuit 500 shown in FIG. 5 further includes a first diode D 1 and a second diode D 2 .
  • One end of the first diode D 1 is connected to the first port a1 of the control circuit, and the other end of the first diode D 1 is connected to one end of the second resistor R 2 .
  • One end of the second diode D 2 is connected to the second port a2 of the control circuit, and the other end of the second diode D 2 is grounded.
  • the first diode D 1 can be a reverse diode, which can prevent the voltage in the detection circuit 500 from affecting the first port a1 of the control circuit.
  • the second diode D 2 can be a voltage-stabilizing diode, which can prevent the voltage in the detection circuit 500 from affecting the second port a2 of the control circuit. Thereby ensuring the stability of the detection circuit 500.
  • the detection circuit in the battery module detection system is composed of resistor and capacitor components (resistors and capacitors), which has a simple structure and is easy to implement.
  • the cost of resistor and capacitor components is low, thereby saving development costs.
  • the insulation resistance of the multiple battery modules can be detected separately by a battery module detection system connected to each battery module, so as to determine the insulation abnormality inside the multiple battery modules based on the insulation resistance and a preset resistance threshold, and then determine the battery module with the insulation abnormality among the multiple battery modules. Furthermore, the battery module with the insulation abnormality can be repaired and replaced.
  • the battery module detection system can also calculate the insulation voltage of the battery module, and then determine the battery cell with the insulation abnormality among the multiple cells of the battery module based on the insulation voltage of the battery module and multiple preset voltage threshold intervals, so as to facilitate maintenance personnel to repair and replace the abnormal battery cells in the battery module, and improve the safety and stability of the battery module.
  • the present application also provides a battery module detection method, please refer to Figure 6, which is a flow chart of the battery module detection method provided by the present application.
  • the battery module detection method provided by the present application is applicable to the battery module detection system shown in Figures 3 to 5. It should be noted that the detection method shown in Figure 6 can be executed by the control circuit shown in Figures 3 to 5 above. Specifically, the battery module detection method may at least include the following steps:
  • the detection circuit includes a resistor unit. Further, from the above content, it can be seen that the detection circuit can receive the power supply voltage generated by the control circuit. When the voltage inside the battery module changes, causing the voltage of the shell to also change, the detection circuit can generate a corresponding detection voltage under the action of the voltage of the shell and the power supply voltage.
  • the above-mentioned resistor unit can generate different detection voltages under the action of different housing voltages and power supply voltages. Therefore, the detection circuit can feed back the detection voltage to the control circuit, so that the control circuit can generate different detection voltages according to the generated power supply voltage.
  • the internal voltage of the battery module is deduced by measuring the received detection voltage and the resistance value of the resistance unit in the detection circuit, thereby determining the insulation abnormality inside the battery module.
  • the battery module detection system in the embodiment of the present application can determine the insulation abnormality between multiple battery cells in the battery module and the outer shell by detecting the insulation resistance between the outer shell and the internal battery cells.
  • the control circuit can amplify the power supply signal according to a preset amplification factor to generate a first power supply voltage, and then transmit the first power supply voltage to the detection circuit.
  • the detection circuit can generate a first detection voltage under the action of the first power supply voltage and the voltage of the shell, and feed it back to the above-mentioned control circuit.
  • the control circuit combines the above-mentioned first power supply voltage, the first detection voltage and the resistance value of the resistance unit in the detection circuit to calculate the insulation resistance inside the battery module.
  • control circuit can also generate and transmit a first power supply voltage and a second power supply voltage to the detection circuit respectively, and receive a first detection signal and a second detection signal respectively fed back by the detection circuit, and then calculate the insulation resistance inside the battery module, that is, the above-mentioned detection parameters, according to the first power supply voltage, the second power supply voltage, the first detection signal, the second detection signal and the resistance values of the resistance units in the detection circuit, and then determine the insulation abnormality between the multiple battery cells inside the battery module and the outer casing of the battery module according to the detection parameters.
  • control circuit after the control circuit calculates the insulation resistance inside the battery module according to the above content, it can further determine the insulation abnormality between the multiple battery cells inside the battery module and the outer shell according to a preset resistance threshold and a comparison result of the insulation resistance.
  • the battery module detection method provided in the embodiment of the present application further includes presetting the voltage threshold interval corresponding to each battery cell, and after calculating the insulation voltage inside the battery module, determining a voltage threshold interval corresponding to the insulation voltage in the preset multiple voltage threshold intervals as the target voltage threshold interval. Furthermore, the control circuit can determine the battery cell corresponding to the target voltage threshold interval as a battery cell with insulation abnormality, so that maintenance personnel can directly repair and replace the abnormally working battery cell in the battery module, thereby saving maintenance costs.
  • An embodiment of the present application also provides a non-volatile computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the operations performed by the control circuit in the above-mentioned method in any of Figure 6 and its possible method embodiments.
  • the embodiment of the present application also provides a computer program product.
  • the computer program product is read and executed by a computer, the operations performed by the control circuit in the aforementioned method in any of the above-mentioned FIG. 6 and possible method embodiments thereof will be executed.
  • the embodiment of the present application also provides a power supply device, please refer to Figure 7, which is a structural schematic diagram of the power supply device provided in the embodiment of the present application.
  • the power supply device includes a battery module, a battery management system and a battery module detection system in the above-mentioned various possible implementations.
  • the battery module is electrically connected to the above-mentioned battery module detection system and the battery management system, respectively.
  • the battery module detection system is used to detect insulation abnormalities inside the battery module and generate detection results based on the insulation abnormalities inside the battery module.
  • the above-mentioned battery module detection system is connected to the battery management system, and the above-mentioned detection results can be sent to the battery management system.
  • the battery management system can output abnormal prompts or normal prompts based on the detection results.
  • the battery module includes at least two battery cells connected in series.
  • the battery module includes at least two battery cells connected in series.
  • the contents of the above-mentioned battery module detection system embodiment are applicable to the embodiments of the present power supply device, the functions specifically implemented by the present power supply device embodiment are the same as those of the above-mentioned battery module detection system embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned battery module detection system embodiment.
  • the present application also provides a battery information collector, see FIG8 , the battery information collector includes the above various possible embodiments.
  • a battery module detection system in an implementation manner.
  • the contents of the above-mentioned battery module detection system embodiment are all applicable to the embodiments of the present battery information collector, the functions specifically implemented by the present battery information collector embodiment are the same as those of the above-mentioned battery module detection system embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned battery module detection system embodiment.
  • the present application also provides an electric device, see Figure 9, which includes the power supply device in the above various possible implementations.
  • the electric device can be an electric device with a battery module, such as an electric car, a household appliance, or a terminal device, which is not limited in the present application.
  • the disclosed system can be implemented in other ways.
  • the system embodiments described above are only schematic, such as the division of the above modules, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the system or unit can be electrical or other forms.
  • modules described above as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional module in each embodiment of the present application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or software functional modules.

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Abstract

一种电池模块检测系统及其方法，包括控制电路和检测电路，其中检测电路包括电阻单元。控制电路用于：控制将电源电压传输给检测电路并获取检测电路反馈的检测电压，根据电源电压、检测电压以及电阻单元的阻值确定电池模块内部的检测参数，以及根据电池模块内部的检测参数确定电池模块内部是否存在绝缘异常情况。

Description

电池模块检测系统及其方法
本申请要求于2023年11月30日提交中国专利局、申请号为202311641695.7、发明名称为“电池模块检测系统及其方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电力电子技术领域，尤其涉及一种电池模块检测系统及其方法。
背景技术
动力电池包由一个或多个电池模块构成，每个电池模块包括多个电芯。通常，动力电池包的外壳与该动力电池包内的电池模块绝缘，且每个电池模块的外壳与该电池模块内的多个电芯绝缘。
然而，受环境以及长时间工作等因素的影响，电池模块内部的电芯容易发生漏液、拉弧或者微短路等绝缘异常情况，当电池模块的外壳与内部电芯之间的绝缘电阻下降时，导致电池模块的外壳与内部电芯之间的绝缘性能变差，这样会给动力电池包甚至相关车辆带来安全隐患。
发明内容
第一方面，本申请提供了一种电池模块检测系统，上述系统包括控制电路和检测电路，上述检测电路电连接至电池模块的外壳，所述检测电路包括电阻单元，上述控制电路连接至上述检测电路，并且上述控制电路用于：控制将电源电压传输给上述检测电路，并获取上述检测电路反馈的检测电压；根据上述电源电压、上述检测电压以及上述电阻单元的阻值，确定上述电池模块内部的检测参数，并根据上述电池模块内部的检测参数，确定上述电池模块内部是否存在绝缘异常情况。
在一种可能的实施方式中，上述电源电压包括第一电源电压，上述检测电压包括上述检测电路所反馈的第一检测电压；上述电池模块内部的检测参数包括电池模块的绝缘电阻；
上述控制电路用于根据上述第一电源电压、上述第一检测电压、上述电阻单元的阻值，确定得到上述电池模块的绝缘电阻，并根据上述电池模块的绝缘电阻与预设的电阻阈值，确定上述电池模块内部的多个电芯与上述电池模块的外壳之间是否存在绝缘异常情况。
在一种可能的实施方式中，上述电源电压包括第一电源电压和第二电源电压，上述检测电压包括第一检测电压和第二检测电压，上述第一检测电压为上述电源电压为上述第一电源电压时，上述检测电路所反馈的检测电压；上述第二检测电压为上述电源电压为上述第二电源电压时，上述检测电路所反馈的检测电压；上述电池模块内部的检测参数包括电池模块的绝缘电阻；
上述控制电路用于根据上述第一电源电压、上述第二电源电压、上述第一检测电压、上述第二检测电压、上述电阻单元的阻值，确定上述电池模块的绝缘电阻，并根据上述电池模块的绝缘电阻与预设的电阻阈值，确定上述电池模块内部的多个电芯与上述电池模块的外壳之间是否存在绝缘异常情况。
在一种可能的实施方式中，上述电池模块内部的检测参数还包括所述电池模块的绝缘电压；
上述控制电路用于根据上述第一电源电压、上述第二电源电压、上述第一检测电压、上述第二检测电压、上述电阻单元的阻值，确定上述电池模块的绝缘电压，当上述绝缘电阻小于上述预设的电阻阈值时，根据上述电池模块的绝缘电压从上述电池模块内部的多个电芯中确定出具有绝缘异常情况的电芯。
在一种可能的实施方式中，上述控制电路用于在上述绝缘电阻小于上述预设的电阻阈值时，将上述电池模块内部的与获取到的目标电压阈值区间对应的电芯确定为具有绝缘异常情况的电芯。
在一种可能的实施方式中，上述电阻单元包括第一电阻、第二电阻、第三电阻、第四电阻以及第五电阻；上述第一电阻的一端连接上述控制电路的第一端口，上述第一电阻的另一端分别连接上述第二电阻的一端、上述第三电阻的一端以及上述第四电阻的一端，上述第二电阻的另一端连接上述控制电路的第二端口，上述第三电阻的另一端、上述第四电阻的另一端、上述第三电阻的另一端及上述第五电阻的一端均接地，上述第五电阻的另一端连接上述电池模块的外壳；
上述控制电路用于通过上述第一端口传输上述电源电压并通过上述第二端口获取上述检测电压。
在一种可能的实施方式中，上述电源电压包括第一电源电压，上述检测电压包括上述检测电路所反馈的第一检测电压；上述控制电路用于根据上述第一电源电压、上述第一检测电压、上述电阻单元的阻值，确定得到上述电池模块内部的绝缘电阻，包括：
上述控制电路用于根据以下公式计算得到上述电池模块的绝缘电阻：
其中，R为上述绝缘电阻的阻值，U1为上述第一检测电压，V1为上述第一电源电压，R1为上述第一电阻的阻值，R2为上述第二电阻的阻值，R3为上述第三电阻的阻值，R4为上述第四电阻的阻值，R5为上述第五电阻的阻值。
在一种可能的实施方式中，上述电源电压包括第一电源电压和第二电源电压，上述检测电压包括第一检测电压和第二检测电压；上述控制电路用于根据上述第一电源电压、上述第二电源电压、上述第一检测电压、上述第二检测电压、上述电阻单元的阻值，确定上述电池模块的绝缘电阻，包括：
上述控制电路用于根据以下公式计算得到上述电池模块的绝缘电阻：
其中，R为上述绝缘电阻的阻值，U1为上述第一检测电压，U2为上述第二检测电压，V1为上述第一电源电压，V2为上述第二电源电压，R1为上述第一电阻的阻值，R2为上述第二电阻的阻值，R3为上述第三电阻的阻值，R4为上述第四电阻的阻值，R5为上述第五电阻的阻值。
在一种可能的实施方式中，上述电源电压包括第一电源电压和第二电源电压，上述检测电压包括第一检测电压和第二检测电压；上述控制电路用于根据以下公式计算得到上述电池模块的绝缘电压：
其中，Ux为上述绝缘电压，U1为上述第一检测电压，U2为上述第二检测电压，V1为上述第一电源电压，V2为上述第二电源电压，R1为上述第一电阻的阻值，R2为上述第二电阻的阻值，R3为上述第三电阻的阻值，R4为上述第四电阻的阻值，R5为上述第五电阻的阻值。
在一种可能的实施方式中，上述检测电路还包括第一电容和第二电容；上述第一电容与上述第三电阻并联连接，上述第二电容的一端连接上述第四电阻的另一端，上述第二电容的另一端接地。
在一种可能的实施方式中，上述检测电路还包括第一二极管和第二二极管；上述第一二极管的正极连接上述控制电路的第一端口，上述第一二极管的负极连接上述第二电阻的一端；上述第二二极管的负极连接上述控制电路的第二端口，上述第二二极管的正极接地。
第二方面，本申请还提供了一种电池模块检测方法，上述方法由电池模块检测系统执行，上述电池模块检测系统包括控制电路和与所述控制电路连接的检测电路，所述检测电路电连接至电池模块的外壳并且包括电阻单元，上述方法包括：
所述控制电路控制将电源电压传输给上述检测电路，并获取上述检测电路反馈的检测电压；
所述控制电路根据上述电源电压、上述检测电压以及上述电阻单元的阻值，确定上述电池模块内部的检测参数，并根据上述电池模块内部的检测参数，确定上述电池模块内部是否存在绝缘异常情况。
在一种可能的实施方式中，上述电源电压包括第一电源电压，上述检测电压包括上述检测电路所反馈的第一检测电压；上述电池模块内部的检测参数包括所述电池模块的绝缘电阻；
上述根据上述电源电压、上述检测电压以及上述电阻单元的阻值，确定上述电池模块内部的检测参数，并根据上述电池模块内部的检测参数，确定上述电池模块内部是否存在绝缘异常情况，包括：
上述根据上述第一电源电压、上述第一检测电压、上述电阻单元的阻值，确定得到上述电池模块的绝缘电阻，并根据上述电池模块的绝缘电阻与预设的电阻阈值，确定上述电池模块内部的多个电芯与上述电池模块的外壳之间是否存在绝缘异常情况。
在一种可能的实施方式中，上述电源电压包括第一电源电压和第二电源电压，上述检测电压包括第一检测电压和第二检测电压，上述第一检测电压为上述电源电压为上述第一电源电压时，上述检测电路所反馈的检测电压；上述第二检测电压为上述电源电压为上述第二电源电压时，上述检测电路所反馈的检测电压；上述电池模块内部的检测参数包括所述电池模块的绝缘电阻；
根据上述电源电压、上述检测电压以及上述电阻单元的阻值，确定上述电池模块内部的检测参数，并根据上述电池模块内部的检测参数，确定上述电池模块内部是否存在绝缘异常情况，包括：
根据上述第一电源电压、上述第二电源电压、上述第一检测电压、上述第二检测电压、上述电阻单元的阻值，确定上述电池模块的绝缘电阻，并根据上述电池模块的绝缘电阻与预设的电阻阈值，确定上述电 池模块内部的多个电芯与上述电池模块的外壳之间是否存在绝缘异常情况。
在一种可能的实施方式中，上述电源电压包括第一电源电压和第二电源电压，上述检测电压包括第一检测电压和第二检测电压，上述电池模块内部的检测参数还包括所述电池模块的绝缘电压；
根据上述电源电压、上述检测电压以及上述电阻单元的阻值，确定上述电池模块内部的检测参数，并根据上述电池模块内部的检测参数，确定上述电池模块内部是否存在绝缘异常情况，包括：
上述控制电路用于根据上述第一电源电压、上述第二电源电压、上述第一检测电压、上述第二检测电压、上述电阻单元的阻值，确定上述电池模块的绝缘电压，当上述绝缘电阻小于上述预设的电阻阈值时，根据上述电池模块的绝缘电压从上述电池模块内部的多个电芯中确定出具有绝缘异常情况的电芯。
在一种可能的实施方式中，上述当上述绝缘电阻小于上述预设的电阻阈值时，根据上述电池模块的绝缘电压，从上述电池模块内部的多个电芯中确定出具有绝缘异常情况的电芯，包括：
在上述绝缘电阻小于上述预设的电阻阈值时，将上述电池模块内部的与获取到的目标电压阈值区间对应的电芯确定为具有绝缘异常情况的电芯。
第三方面，本申请还提供了一种非易失性计算机可读存储介质，该非易失性计算机可读存储介质存储有计算机程序或计算机指令，前述计算机程序或计算机指令被处理器执行以实现上述第二方面任一项前述的方法。
第四方面，本申请还提供一种计算机程序产品，该计算机程序产品被处理器执行时，上述第二方面任一项前述的方法将被执行。
第五方面，本申请还提供了一种电池信息采集器，上述电池信息采集器包括上述第一方面的电池模块检测系统。
第六方面，本申请还提供了一种供电设备，包括电池模块、电池管理系统及上述第一方面的电池模块检测系统或上述第五方面的电池信息采集器；上述电池模块检测系统用于检测上述电池模块内部的绝缘异常情况，并根据上述电池模块内部的绝缘异常情况生成检测结果，并将上述检测结果发送给上述电池管理系统；上述电池管理系统用于根据上述检测结果输出异常提示或者正常提示。
在一种可能的实施方式中，上述电池模块包括至少两个串联连接的电芯。
第七方面，本申请还提供了一种电动设备，上述电动设备包括第六方面的供电设备。
附图说明
为了更清楚的说明本申请实施方式中的技术方案，下面将对实施方式中所需要使用的附图作简单的介绍，显而易见的，下面描述中的附图仅仅是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的动力电池包的一结构示意图；
图2为本申请实施例提供的动力电池包的另一结构示意图；
图3为本申请实施例提供的电池模块检测系统的一结构示意图；
图4为本申请实施例提供的检测电路的一结构示意图；
图5为本申请实施例提供的检测电路的另一结构示意图；
图6为本申请提供的电池模块检测方法的一流程示意图；
图7是本申请实施例提供的供电设备的一结构示意图；
图8是本申请实施例提供的电池信息采集器的一结构示意图；
图9是本申请实施例提供的电动设备的一结构示意图。
附图标记说明：
300-电池模块检测系统，301-控制电路，302-检测电路，320-电池模块，330-外壳，310-动力电池包，
(C1)-第一电容，(C2)-第二电容，(D1)-第一二极管，(D2)-第二二极管。
具体实施方式
下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整的描述，显然，所描述的实施方式仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。
以下分别进行详细说明。
本申请的说明书和权利要求书及所述附图中的术语“第一”、“第二”、“第三”和“第四”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
需要说明的是，动力电池包是新能源汽车的动力来源，用于存储电能并提供电能给新能源汽车。通常的，动力电池包的输出电压超过300伏，因此，可以将多个电芯串联或者并联起来形成电池模块，再由多个电池模块串联或者并联构成动力电池包，以提高动力电池包的输出电压。
示例性的，上述电池模块可以是由多个电芯构成的电池模组。或者，上述电池模块还可以是多个电芯封装形成的电池包。或者，上述电池模块还可以由多个电芯直接封装于底盘中构成。可以理解的是，此处仅为示例，不构成对本申请实施例的限制。
本申请提供了一种电池模块检测系统及其方法，可以检测电池模块内部的绝缘异常情况，保证电池模块的安全性和稳定性。
本申请实施例中，电池模块检测系统可以对电池模块内部的绝缘异常情况进行检测，能够定位到具有 绝缘异常情况的电池模块，且有利于在电池模块内部具有绝缘异常情况时，及时进行预警，保证电池模块动力电池包、车辆的安全有效。其中，该电池模块检测系统包括控制电路和检测电路，检测电路分别与控制电路以及待检测的电池模块连接。进一步的，上述控制电路可以产生并传输电源电压给检测电路，上述检测电路包括电阻单元，该检测电路基于电阻单元、电源电压以及电池模块生成检测电压；检测电路可以将产生的检测电压反馈给控制电路。控制电路根据接收到的检测电压、产生的电源电压以及上述电阻单元的阻值，计算得到电池模块内部的检测参数。可以理解的是，该检测参数可以理解为用于表征电池模块内部多个电芯与电池模块的外壳之间的绝缘异常情况的参数。因此，控制电路可以根据上述检测参数确定电池模块内部的绝缘异常情况，有利于在电池模块内部具有绝缘异常情况时及时进行预警，进而可以方便维修人员对电池模块的异常情况进行排查，保证了电池模块动力电池包、车辆的安全有效。
在一些可行的实施方式中，请参阅图1，图1为本申请实施例提供的动力电池包的一结构示意图。如图1所示，该动力电池包100包括外壳110和多个电池模块。该外壳110作为动力电池包100的保护结构，可以对其中的多个电池模块起到固定和支撑作用。上述多个电池模块包括电池模块120、电池模块130，该多个电池模块通过BC极柱串联连接。上述BC极柱可以理解为电池模块用于连接外部导体的连接端子，例如，电池模块130的BC极柱与电池模块120的BC极柱连接，进而使得电池模块130与电池模块120产生电连接。进一步的，图1中每个电池模块均包括外壳以及多个电芯BT1、BT2、BT3、……，该多个电芯串联连接。上述电池模块的外壳用于对电池模块内的多个电芯进行封装和保护，进而可以避免不同电池模块之间发生短接，影响动力电池包100的正常工作。可以理解的是，上述每个电池模块的电压等于该电池模块内串联连接的多个电芯的电压总和，同理的，动力电池包100的电压等于动力电池包100内串联连接的多个电池模块的电压总和。
在一些可行的实施方式中，动力电池包100的外壳110与多个电池模块之间绝缘，可以避免外界对动力电池包100内部的多个电池模块造成干扰。例如，在外界环境潮湿、高温等情况下，外壳110通过与多个电池模块之间绝缘，可以保持多个电池模块仍然安全有效。同理的，上述每个电池模块的外壳与该电池模块内部的多个电芯之间绝缘，可以避免外界对内部多个电芯造成不良影响，同时避免不同电池模块之间互相干扰。例如，假设图1中电池模块120的电芯发生故障时，由于电池模块120通过其外壳140与电池模块130绝缘，且电池模块130通过其外壳150与电池模块120绝缘，因此，电池模块120的故障不会影响电池模块130的正常工作。
需要说明的是，当动力电池包内部的电池模块或者电芯发生绝缘异常情况时，会使得动力电池包的外壳与电池模块之间的绝缘性能下降，进而导致动力电池包的安全性和稳定性受到影响。其中，动力电池包的外壳与电池模块之间的绝缘性能可以理解为，动力电池包的外壳与电池模块之间的等效绝缘电阻的阻值。进一步的，动力电池包的外壳与电池模块之间的等效绝缘电阻，指的是在动力电池包的外壳与电池模块之 间加上电压时，该电压与从外壳流向电池模块或者从电池模块流向外壳的电流的比值。在外壳与电池模块之间完全绝缘时，上述等效绝缘电阻的阻值为无限大。当电池与电池模块之间绝缘性能下降时，上述等效绝缘电阻的阻值减小，即等效绝缘电阻的阻值越小，绝缘性能越差。
同理的，电池模块的外壳与内部电芯之间的绝缘性能，也可以通过电池模块的外壳与内部电芯之间的等效绝缘电阻进行表征。
在一些可行的实施方式中，当一个或者多个电池模块的电芯发生漏液，且液体渗透到电池模块外部时，漏出的液体会导致动力电池包的外壳与电池模块之间不再绝缘，即绝缘性能下降。为了保证动力电池包的安全稳定，可以对动力电池包的外壳与电池模块之间的等效绝缘电阻进行检测。
在一些可行的实施方式中，上述动力电池包的外壳与多个电池模块之间的等效绝缘电阻，可以通过该动力电池包的母线与外壳之间的电阻阻值进行表征。其中，动力电池包的母线可以理解为动力电池包进行供电或者进行充电的总线。为便于理解，本申请实施例结合图2的动力电池包200进行举例说明。
请参阅图2，图2为本申请实施例提供的动力电池包的另一结构示意图。如图2所示，动力电池包200的总负母线与电池模块220的BC极柱连接，相当于动力电池包200的负极；动力电池包200的总正母线与电池模块230的BC极柱连接，相当于动力电池包200的正极。此外，动力电池包200中还包括串联连接的电阻Ra、电阻Rb、电阻Rc和电阻Rd。动力电池包200的外壳210与多个电池模块之间的等效绝缘电阻，可以通过动力电池包200的总正母线与外壳210之间的电阻Rp，以及总负母线与外壳210之间的电阻Rn进行表征。为此，动力电池包200可以通过绝缘检测电路240检测上述电阻Rp、电阻Rn以确定外壳210与电池模块220或者电池模块230之间的等效绝缘电阻，进而可以在动力电池包200中存在一个或者多个电池模块发生绝缘异常情况时，及时进行预警。
然而，随着电池模块的封装技术不断升级和迭代，电池模块内部的电芯在发生故障时，通常不会影响电池模块的外部。例如，在电池模块内部的电芯发生泄露时，漏出的液体通常只会留在该电池模块内部，导致电池模块内部的绝缘性能下降，而不会渗透到电池模块外部，不影响动力电池包外壳与电池模块之间的绝缘性能。可以理解的是，图2所示的绝缘检测电路240只能用于对动力电池包200的外壳210与多个电池模块之间的等效绝缘电阻进行检测，而不能对任一电池模块内部的绝缘性能进行检测，进而在电池内部的电芯发生异常，导致电池模块内部绝缘性能下降时，无法及时进行预警，存在安全隐患。
基于上述技术问题的提出，本申请实施例提供了一种电池模块检测系统，可以对电池模块内部的绝缘性能进行检测，以在电池模块电芯发生绝缘异常情况，导致电池模块的外壳与电芯之间的等效绝缘电阻下降时，及时进行预警，进而提高动力电池包的安全性和稳定性。
在一些可行的实施方式中，请参阅图3，图3为本申请实施例提供的电池模块检测系统的一结构示意图。图3所示的电池模块检测系统300设置在动力电池包310内，用于对动力电池包310中，电池模块320 内部的绝缘异常情况进行检测。该电池模块320内部包括电芯BT1、电芯BT2、电芯BT3、……等多个电芯。进一步的，电池模块320内部的绝缘异常情况可以理解为，电池模块320内部的多个电芯中存在一个或者多个电芯发生异常时，导致电池模块320不能正常工作的情况。例如，在电芯BT1发生漏液的情况下，该电芯BT1与电池模块320的外壳330之间的等效绝缘电阻下降，即电芯BT1发生异常。或者，在电芯BT2发生拉弧的情况下，该电芯BT2与上述外壳330之间的等效绝缘电阻也会下降，即电芯BT2发生异常。或者，在电芯BT3发生微短路的情况下，该电芯BT3与上述外壳330之间的等效绝缘电阻也会下降，即电芯BT2发生异常。上述电池模块320中任一电芯发生异常均会导致该电池模块320不能正常工作，也就是电池模块320内部发生绝缘异常情况。需要说明的，上述电芯漏液、拉弧、微短路的绝缘异常情况仅作为示例，电池模块320中还可以发生其他绝缘异常情况，本申请在此不一一进行举例说明。
在一些可行的实施方式中，本申请实施例的电池模块检测系统300通过对电池模块320进行检测，可以得到电池模块320内部的检测参数。电池模块320内部的检测参数可以理解为用于表征电池模块320内部是否存在电芯工作异常的参数，则电池模块检测系统300可以根据该检测参数确定电池模块320内部是否存在电芯工作异常，进而确定电池模块320内部的绝缘异常情况。
也就是说，电池模块检测系统300可以先获取电池模块320内部的检测参数，然后再根据该检测参数确定电池模块320内部的绝缘异常情况。为便于理解，本申请实施例在以下内容对获取电池模块320内部的检测参数的具体过程进行解释说明。
需要说明的是，当电池模块320内部发生绝缘异常情况时，电池模块320内部的电压也会发生变化。例如，在正常情况下，电池模块320的多个电芯与外壳330之间绝缘，则电池模块320内部的电压分布在串联连接的多个电芯之间，同时外壳330不带电，即外壳330的电压为0。在电池模块320的电芯BT1发生漏液时，电芯BT1通过漏出的液体与上述外壳330电连接，则电池模块320内部的电压分布在外壳330，以及串联连接的多个电芯之间，此时外壳330带电，外壳330的电压不再为0。也就是说，电池模块320内部的电压可以用于表征电池模块320内部的绝缘异常情况，因此，本申请实施例的电池模块检测系统300可以检测电池模块320内部的电压变化，以将电池模块320内部的电压变化作为上述检测参数。
在一些可行的实施方式中，该电池模块检测系统300包括控制电路301和检测电路302，该检测电路302分别连接上述电池模块320和控制电路301。由上述内容可知，电池模块320内部的电压分布发生变化时，电池模块320的外壳330的电压也会发生变化，即外壳330的电压变化可以反映电池模块320内部的电压变化。因此，上述电池模块检测系统300可以通过检测电路302连接电池模块320的外壳330，以在电池模块320内部发生绝缘异常情况，导致外壳330的电压变化时，获得检测参数，进而根据该检测参数确定电池模块320内部的绝缘异常情况。
在一些可行的实施方式中，上述检测电路302在检测电池模块320内部电压的同时，还可以接收控制 电路301产生的电源电压。进一步的，在电池模块320内部电压变化，使得外壳330的电压也发生变化时，检测电路302在外壳330的电压以及电源电压的作用下，可以产生相应的检测电压。需要说明的是，检测电路302包括电阻单元，该电阻单元在不同的外壳330的电压以及电源电压的作用下，可以产生不同的检测电压。因此，检测电路302可以反馈该检测电压给控制电路301，进而使得控制电路301可以根据产生的电源电压、接收到的检测电压以及检测电路302中电阻单元的阻值，反推出电池模块320的内部电压，进而确定电池模块320内部的绝缘异常情况。
在一些可行的实施方式中，上述控制电路301可以接收供电信号并基于该供电信号进行工作。该供电信号可以理解为控制电路301的直流工作电压。例如，假设控制电路301的直流工作电压为3.3伏，则控制电路301可以接收3.3伏的直流电压作为上述供电信号。可以理解的是，该供电信号可以由外部的直流电源提供给控制电路301，本申请对此不进行限定。进一步的，控制电路301可以根据该供电信号产生电源电压。具体的，控制电路301可以根据预设的放大倍数对上述供电信号进行放大，进而产生上述电源电压。该放大倍数可以为大于0的整数或分数。例如，在控制电路301的供电信号为3.3伏的情况下，当电源电压也为3.3伏时，控制电路301可以预设放大倍数为1，然后根据该放大倍数对供电信号进行放大，产生3.3伏的电源电压。同理的，在电源电压为其他数值时，可以改变预设的放大倍数，以产生相应的电源电压。并将该电源电压传输给检测电路302，以使检测电路302在该电源电压以及外壳330的电压的作用下，产生相应的检测电压，并反馈给控制电路301。
在一些可行的实施方式中，由上述内容可知，电池模块320的外壳330与内部多个电芯之间的绝缘性能，可以通过电池模块320内部的绝缘电阻进行表征。其中，电池模块320内部的绝缘电阻可以理解为电池模块320内部多个电芯与外壳330之间的等效电阻。例如，在电池模块320中不存在电芯工作异常时，电池模块320中多个电芯均与外壳330绝缘，多个电芯与外壳330之间的等效电阻为无限大，即电池模块320内部的绝缘电阻为无限大。当电池模块320中电芯BT1工作异常时，电芯BT1与外壳330的等效电阻下降，则电池模块320内部的绝缘电阻下降。因此，本申请实施例中电池模块检测系统300可以通过检测外壳330与内部电芯之间的绝缘电阻，以确定电池模块320中多个电芯与外壳330之间的绝缘异常情况。
在一些可行的实施方式中，在上述检测参数包括电池模块320内部的绝缘电阻的情况下，控制电路301可以根据预设放大倍数对供电信号进行放大，以产生第一电源电压，然后传输该第一电源电压给检测电路302。检测电路302可以在第一电源电压，以及外壳330的电压的作用下，产生第一检测电压，并反馈给上述控制电路301。进一步的，控制电路301在接收到第一检测电压之后，结合上述第一电源电压、第一检测电压以及检测电路302中电阻单元的阻值，计算得到电池模块320内部的绝缘电阻。
在一些可行的实施方式中，为了便于理解上述控制电路根据上述方法计算得到绝缘电阻的原理，本申请实施例结合图4进行详细说明。
具体的，请参阅图4，图4为本申请实施例提供的检测电路的一结构示意图。如图4所示，该检测电路400的电阻单元包括第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4以及第五电阻R5。其中，上述第一电阻R1的一端连接控制电路410的第一端口a1，上述第一电阻R1的另一端分别连接第二电阻R2的一端、第三电阻R3的一端以及第四电阻R4的一端，上述第二电阻R2的另一端连接控制电路410的第二端口a2，上述第三电阻R3的另一端接地，上述第四电阻R4的另一端分别连接第三电阻R3的另一端、第五电阻R5的一端，上述第五电阻R5的另一端连接电池模块420的外壳430。
可以理解的是，上述控制电路410在产生第一电源电压后，可以通过第一端口a1传输该第一电源电压给检测电路400。检测电路400连接外壳430，可以在外壳430的电压以及第一电源电压的作用下，产生相应的第一检测信号。由上述内容可知，该第一检测电压与上述第一电源电压、电池模块420内部的电压以及上述各个电阻的阻值有关。进一步的，检测电路400可以通过控制电路410的第二端口a2反馈第一检测电压给控制电路410。
在一些可行的实施方式中，第一检测电压U1可以通过以下公式(1)进行表征：
其中，R为电池模块420内部的绝缘电阻的阻值，U1为第一检测电压，V1为第一电源电压，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值，R5为第五电阻的阻值。
在一些可行的实施方式中，上述控制电路410可以用于在接收到检测电路400反馈的第一检测电压U1之后，根据以下公式(2)计算得到电池模块420内部的绝缘电阻R：
其中，R为电池模块420内部的绝缘电阻的阻值，U1为第一检测电压，V1为第一电源电压，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值，R5为第五电阻的阻值。
总的来说，控制电路410可以通过产生并传输第一电源电压给检测电路400，并接收该检测电路400反馈的第一检测信号，然后根据该第一电源电压、第一检测信号以及检测电路400中电阻单元的各个电阻阻值，计算得到电池模块420内部的绝缘电阻，即上述检测参数，进而根据该检测参数确定电池模块420内部的多个电芯与电池模块420的外壳430之间的绝缘异常情况。
在一些可行的实施方式中，图4所示的控制电路410除了可以根据上述公式(2)计算得到电池模块420内部的绝缘电阻，还可以根据以下方法计算得到上述绝缘电阻。此时，控制电路410可以根据预设放大倍数产生第一电源电压和第二电源电压，然后分别传输该第一电源电压和第二电源电压给检测电路400。检测电路400可以在第一电源电压，以及外壳430的电压的作用下，产生第一检测电压，并反馈给上述控制电路410。检测电路400还可以在第二电源电压，以及外壳430的电压的作用下，产生第二检测电压， 并反馈给上述控制电路410。进一步的，控制电路410在接收到第一检测电压以及第二检测电压之后，结合上述第一电源电压、第二电源电压、第一检测电压、第二检测电压以及检测电路400中电阻单元的阻值，计算得到电池模块420内部的绝缘电阻。
在一些可行的实施方式中，为了便于理解上述控制电路410根据上述方法计算得到绝缘电阻的原理，本申请实施例结合图4进行详细说明。
具体的，请再次参阅图4，图4所示的控制电路410在产生第一电源电压后，可以通过第一端口a1传输该第一电源电压给检测电路400。检测电路400连接外壳430，可以在外壳430的电压以及第一电源电压的作用下，产生相应的第一检测信号。由上述内容可知，该第一检测电压与上述第一电源电压、电池模块420内部的电压以及上述各个电阻的阻值有关。进一步的，检测电路400可以通过控制电路410的第二端口a2反馈第一检测电压。然后，控制电路410在接收到第一检测电压之后，可以产生第二电源电压，并通过第一端口a1传输该第二电源电压给检测电路400。检测电路400可以在外壳430的电压以及第二电源电压的作用下，产生相应的第二检测信号。由上述内容可知，该第二检测电压与上述第二电源电压、电池模块420内部的电压以及上述各个电阻的阻值有关。进一步的，检测电路400可以通过控制电路410的第二端口a2反馈第二检测电压。
需要说明的，在一些可行的实施方式中，检测电路400反馈的第一检测电压可以通过上述公式(3)进行表征：
其中，U1为第一检测电压，V1为第一电源电压，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值，R5为第五电阻的阻值，Ux为电池模块420内部的电压。
同理的，第二检测电压可以通过以下公式(4)进行表征：
其中，U2为第二检测电压，V2为第二电源电压，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值，R5为第五电阻的阻值，Ux为电池模块420内部的电压。
在一些可行的实施方式中，上述控制电路410可以用于在接收到检测电路400反馈的第一检测电压U1和第二检测电压U2之后，根据以下公式(5)计算得到电池模块420内部的绝缘电阻R：
其中，R为电池模块420内部的绝缘电阻的阻值，U1为第一检测电压，U2为第二检测电压，V1为第一电源电压，V2为第二电源电压，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为 第四电阻的阻值，R5为第五电阻的阻值。
总的来说，控制电路可以通过分别产生并传输第一电源电压、第二电源电压给检测电路，并接收该检测电路分别反馈的第一检测信号和第二检测信号，然后根据该第一电源电压、第二电源电压、第一检测信号、第二检测信号以及检测电路中电阻单元的各个电阻阻值，计算得到电池模块内部的绝缘电阻，即上述检测参数，进而根据该检测参数确定电池模块内部的多个电芯与电池模块的外壳之间的绝缘异常情况。
在一些可行的实施方式中，控制电路在根据上述内容计算得到电池模块内部的绝缘电阻之后，进一步的，可以根据预设的电阻阈值以及该绝缘电阻的比较结果，确定电池模块内部的多个电芯与外壳之间的绝缘异常情况。具体的，上述电阻阈值可以理解为电池模块内部不存在绝缘异常情况时，电池模块内部的绝缘电阻的最小值。也就是说，当电池模块内部的绝缘电阻小于该电阻阈值时，表征此时电池模块内部存在绝缘异常情况。例如，在一些应用场景中，该电阻阈值可以为1兆欧姆，则当控制电路计算得到的绝缘电阻小于1兆欧姆时，控制电路可以确定电池模块内部的多个电芯与外壳之间存在绝缘异常情况。
可以理解的是，在动力电池包内存在多个电池模块的情况下，可以通过与每个电池模块连接的上述电池模块检测系统，对多个电池模块内部的检测参数(例如上述绝缘电阻)进行检测，以确定发生绝缘异常情况的电池模块，方便对故障的电池模块进行维修和更换。
在一些可行的实施方式中，本申请实施例提供的电池模块检测系统除了可以对动力电池包中发生绝缘异常情况的电池模块进行确定，还可以确定发生绝缘异常情况的电池模块内，工作异常的电芯，以使维修人员可以直接对该电池模块中工作异常的电芯进行维修更换，进而可以节约维修成本。
具体的，请再次参阅图4，如图4所示，该电池模块420包括多个电芯：电芯BT1、电芯BT2、电芯BT3，且电芯BT1的正极与电芯BT2的负极连接于a点，电芯BT2的正极与电芯BT3的负极连接于b点，电芯BT3的正极与电池模块420的BC极柱连接于c点。需要说明的是，由于上述多个电芯为串联连接，上述a点、b点以及c点的电压分布符合电池串联电路的分布特点。因此，在电池模块420正常工作的情况下，c点正常电压＞b点正常电压＞a点正常电压。例如，在上述多个电芯的输出电压均为5伏的情况下，a点正常电压等于电芯BT1的输出电压5伏，b点正常电压等于电芯BT1与电芯BT2相加的输出电压10伏，c点正常电压等于电芯BT1、电芯BT2以及电芯BT3相加的输出电压15伏。
可以理解的是，当电池模块420的多个电芯没有异常时，该多个电芯与外壳430之间绝缘，此时，多个电芯的输出电压没有加载在外壳430上，外壳430的电压小于预设的外壳电压阈值。该外壳电压阈值可以理解为外壳430带电时的电压最小值，外壳430的电压大于该外壳电压阈值，即表征外壳430带电。可以理解的是，当电池模块420的电芯工作异常时，该工作异常的电芯与外壳430不再绝缘，即工作异常的电芯会通过绝缘电阻将输出电压传输至外壳430。例如，当电芯BT1发生漏液、微短路等异常时，电芯BT1会通过绝缘电阻R与电池模块420的外壳430电连接，进而可以等效为电芯BT1的输出电压(即a点正常电压)通过绝缘电阻作用在外壳430上。同理的，当电芯BT2发生漏液、微短路等异常时，电芯BT2会通过绝缘电阻R与电池模块420的外壳430电连接，进而可以等效为电芯BT1以及电芯BT2的输出电压(即b点正常电压)通过绝缘电阻作用在外壳430上。当电芯BT3发生漏液、微短路等异常时，电芯BT3会通过绝缘电阻R与电池模块420的外壳电连接，进而可以等效为电芯BT1、电芯BT2以及电芯BT3的输出电压(即c点正常电压)通过绝缘电阻作用在外壳430上。也就是说，在电池模块420中不同电芯发生异常时，对应作用在外壳430上的电压也不同。为此，本申请实施例的电池模块检测系统可以通 过检测电池模块420，计算得到电池模块420内部作用在外壳430上的电压，并将该电压确定为电池模块420的绝缘电压Ux。该绝缘电压Ux可以理解为电池模块420中存在电芯发生绝缘异常情况时，该工作异常的电芯使得外壳430带有一定的电压，例如上述电芯BT1的输出电压或电芯BT1与电芯BT2共同的输出电压。
在一些可行的实施方式中，为了确定电池模块420是否发生绝缘异常情况，并在异常的电池模块420中确定出工作异常的电芯，控制电路410可以根据上述电源电压、检测电压以及电阻单元的阻值，计算得到该电池模块420内部的绝缘电压和绝缘电阻，即电池模块420内部的检测参数包括绝缘电压和绝缘电阻。然后根据该绝缘电阻确定电池模块420内部是否发生绝缘异常情况，再根据该绝缘等效电压确定电池模块420内，具有绝缘异常情况的电芯。
可以理解的是，上述控制电路410计算得到该电池模块420内部的绝缘电阻的具体实施方式可以参阅上述内容，本申请在此不作赘述。进一步的，控制电路410在计算得到电池模块420内部的绝缘电阻之后，由上述内容可知，可以在该绝缘电阻小于预设的电阻阈值时，确定该电池模块420内部多个电芯与外壳430之间存在绝缘异常情况，即电池模块420内部多个电芯中存在电芯工作异常。进一步的，控制电路410可以根据上述电源电压、检测电压以及检测电路400的电阻单元的阻值，计算得到电池模块420内部的绝缘电压。
具体的，在检测电路400的电阻单元如图4所示的情况下，控制电路410可以根据以下内容计算得到上述绝缘电压。首先，控制电路410在产生第一电源电压后，可以通过第一端口a1传输该第一电源电压给检测电路400。检测电路400连接外壳430，可以在外壳430的电压以及第一电源电压的作用下，产生相应的第一检测信号。由上述内容可知，该第一检测电压与上述第一电源电压、电池模块420内部的电压以及上述各个电阻的阻值有关。进一步的，检测电路400可以通过控制电路410的第二端口a2反馈第一检测电压。然后，控制电路410在接收到第一检测电压之后，可以产生第二电源电压，并通过第一端口a1传输该第二电源电压给检测电路400。检测电路400可以在外壳430的电压以及第二电源电压的作用下，产生相应的第二检测信号。由上述内容可知，该第二检测电压与上述第二电源电压、电池模块420内部的电压以及上述各个电阻的阻值有关。进一步的，检测电路400可以通过控制电路410的第二端口a2反馈第二检测电压。
需要说明的，检测电路400反馈的第一检测电压可以通过上述公式(3)进行表征，第二检测电压可以通过上述公式(4)进行表征，本申请在此不作赘述。
在一些可行的实施方式中，上述控制电路410可以用于在接收到检测电路400反馈的第一检测电压U1和第二检测电压U2之后，根据以下公式(6)计算得到电池模块420内部的绝缘电压Ux：
其中，Ux为绝缘电压，U1为第一检测电压，U2为第二检测电压，V1为第一电源电压，V2为第二电源电压，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值，R5为第五电阻的阻值。
可以理解的是，当电池模块420中多个电芯都正常工作时，该多个电芯与外壳430之间绝缘，此时，控制电路410计算得到的绝缘电压小于预设的绝缘电压阈值。该绝缘电压阈值可以理解为电池模块420中 电芯工作异常时，作用在绝缘电压和外壳上的电压的最小值。也就是说，当控制电路410计算得到的绝缘电压小于上述绝缘电压阈值时，可以确定该电池模块420中不存在电芯工作异常。进一步的，当控制电路410计算得到的绝缘电压大于上述绝缘电压阈值时，可以确定电池模块420中存在电芯工作异常，该工作异常的电芯与外壳430不再绝缘，即工作异常的电芯会通过绝缘电阻将输出电压作用在外壳430上，因此，控制电路410可以根据计算得到的绝缘电压以及多个电芯对应的输出电压，确定发生异常的电芯。
具体的，控制电路410可以预先设置多个电压阈值区间。需要说明的是，上述预设的多个电压阈值区间可以理解为电池模块420中多个电芯分别对应的多个电压阈值区间。例如，如图4所示的电池模块420包括电芯BT1、电芯BT2和电芯BT3。由上述内容可知，在上述多个电芯的输出电压均为5伏的情况下，当电芯BT1具有绝缘异常情况时，电芯BT1的输出电压通过绝缘电阻作用在外壳430上，此时计算得到的绝缘电压接近电芯BT1的输出电压5伏。因此，控制电路410可以将电芯BT1对应的电压阈值区间确定为以5伏为均值的区间，例如3伏至7伏。可以理解的是，当计算得到电池模块420的绝缘电压等于6伏时，可以确定该电池模块420的电芯BT1异常。
同理的，当电池BT2具有绝缘异常情况时，电芯BT2串联连接电芯BT1，电芯BT1和电芯BT2的输出电压相加后通过绝缘电阻作用在外壳430上，此时计算得到的绝缘电压接近电芯BT1与电芯BT2的输出电压之和10伏。因此，控制电路410可以将电芯BT2对应的电压阈值区间确定为以10伏为均值的区间，例如8伏至12伏。可以理解的是，当计算得到电池模块420的绝缘电压等于9伏时，可以确定该电池模块420的电芯BT2异常。
同理的，当电池BT3具有绝缘异常情况时，电芯BT3串联连接电芯BT2、电芯BT1，电芯BT1、电芯BT2以及电芯BT3的输出电压相加后通过绝缘电阻作用在外壳430上，此时计算得到的绝缘电压接近电芯BT1、电芯BT2以及电芯BT3的输出电压之和15伏。因此，控制电路410可以将电芯BT3对应的电压阈值区间确定为以15伏为均值的区间，例如13伏至17伏。可以理解的是，当计算得到电池模块420的绝缘电压等于14伏时，可以确定该电池模块420的电芯BT3异常。
总的来说，控制电路410可以根据电池模块420内部各个电芯串联连接的输出电压，确定每个电芯对应的电压阈值区间。上述电芯BT1、电芯BT2以及电芯BT3的电压阈值区间仅作为示例，本申请在此不一一举例说明。需要说明的是，为了避免判断工作异常的电芯出现失误，控制电路410在预先设置各个电芯对应的电压阈值区间时，应当保证各个电芯对应的电压阈值区间互不重叠。
可以理解的是，控制电路410在计算得到电池模块420内部的绝缘电压后，可以在预设的多个电压阈值区间中，将该绝缘电压相对应的一个电压阈值区间确定为目标电压阈值区间。其中，目标电压阈值区间可以理解为，包括计算得到的绝缘电压的一个电压阈值区间。例如，假设电芯BT1对应的电压阈值区间为3伏至7伏，当控制电路410计算得到绝缘电压为7伏时，则可以确定电芯BT1对应的电压阈值区间3伏 至7伏为上述目标电压阈值区间。进一步的，控制电路410可以将该目标电压阈值区间对应的电芯确定为具有绝缘异常情况的电芯，也就是把上述电芯BT1确定为具有绝缘异常情况的电芯。
在一些可行的实施方式中，请参阅图5，图5为本申请实施例提供的检测电路的另一结构示意图。如图5所示，该检测电路500还包括第一电容C1和第二电容C2。其中，第一电容C1与上述第三电阻R3并联连接，所述第二电容C2的一端连接所述第四电阻R4的另一端，所述第二电容C2的另一端接地。需要说明的是，上述第一电容C1为滤波电容，可以对检测电路500中的干扰信号进行滤除，避免对检测参数造成干扰。第二电容C2为检测电路500中的寄生电容。
在一些可行的实施方式中，请再次参阅图5，如图5所示的检测电路500还还包括第一二极管D1和第二二极管D2。其中，第一二极管D1的一端连接控制电路的第一端口a1，第一二极管D1的另一端连接第二电阻R2的一端。上述第二二极管D2的一端连接控制电路的第二端口a2，第二二极管D2的另一端接地。需要说明的是，上述第一二极管D1可以为反向二极管，可以防止检测电路500中的电压对控制电路的第一端口a1造成影响。上述第二二极管D2可以为稳压二极管，可以防止检测电路500中的电压对控制电路的第二端口a2造成影响。进而保证检测电路500的稳定性。
在一些可行的实施方式中，由上述内容可知，电池模块检测系统中的检测电路由阻容器件(电阻和电容)构成，结构简单，易于实现。且阻容器件的成本较低，进而可以节省开发成本。
本申请实施例中，在动力电池包中包括多个电池模块的情况下，通过与每个电池模块连接的电池模块检测系统，可以分别对多个电池模块的绝缘电阻进行检测，以根据该绝缘电阻以及预设的电阻阈值确定多个电池模块内部的绝缘异常情况，进而确定出多个电池模块中具有绝缘异常情况的电池模块。进一步的，可以对具有绝缘异常情况的电池模块进行维修更换。可以理解的是，当确定电池模块具有绝缘异常情况时，电池模块检测系统还可以计算得到电池模块的绝缘电压，进而可以根据该电池模块的绝缘电压以及预设的多个电压阈值区间，在电池模块的多个电芯中确定具有绝缘异常情况的电芯，方便维修人员对电池模块中的异常电芯进行维修和更换，提高电池模块的安全性和稳定性。
本申请实施例还提供了一种电池模块检测方法，请参阅图6，图6为本申请提供的电池模块检测方法的一流程示意图。本申请实施例提供的电池模块检测方法适用于图3至图5所示的电池模块检测系统。需要说明的是，图6所示的检测方法可以由上述图3至图5所示的控制电路执行。具体的，电池模块检测方法可至少包括以下步骤：
S101、控制将电源电压传输给检测电路，并获取检测电路反馈的检测电压。
在一些可行的实施方式中，上述检测电路包括电阻单元。进一步的，由上述内容可知，检测电路可以接收控制电路产生的电源电压。在电池模块内部电压变化，使得外壳的电压也发生变化时，检测电路在外壳的电压以及电源电压的作用下，可以产生相应的检测电压。
上述S101的具体实现方式可以参阅上述图3至图5中控制电路所执行的实现方式，本申请实施例在此不再赘述。
S102、根据电源电压、检测电压以及电阻单元的阻值，确定电池模块内部的检测参数，并根据电池模块内部的检测参数，确定电池模块内部是否存在绝缘异常情况。
在一些可行的实施方式中，上述电阻单元在不同的外壳的电压以及电源电压的作用下，可以产生不同的检测电压。因此，检测电路可以反馈该检测电压给控制电路，进而使得控制电路可以根据产生的电源电 压、接收到的检测电压以及检测电路中电阻单元的阻值，反推出电池模块的内部电压，进而确定电池模块内部的绝缘异常情况。
在一些可行的实施方式中，本申请实施例中电池模块检测系统可以通过检测外壳与内部电芯之间的绝缘电阻，以确定电池模块中多个电芯与外壳之间的绝缘异常情况。
在一些可行的实施方式中，在上述检测参数包括电池模块内部的绝缘电阻的情况下，控制电路可以根据预设放大倍数对供电信号进行放大，以产生第一电源电压，然后传输该第一电源电压给检测电路。检测电路可以在第一电源电压，以及外壳的电压的作用下，产生第一检测电压，并反馈给上述控制电路。进一步的，控制电路在接收到第一检测电压之后，结合上述第一电源电压、第一检测电压以及检测电路中电阻单元的阻值，计算得到电池模块内部的绝缘电阻。
在一些可行的实施方式中，控制电路还可以通过分别产生并传输第一电源电压、第二电源电压给检测电路，并接收该检测电路分别反馈的第一检测信号和第二检测信号，然后根据该第一电源电压、第二电源电压、第一检测信号、第二检测信号以及检测电路中电阻单元的各个电阻阻值，计算得到电池模块内部的绝缘电阻，即上述检测参数，进而根据该检测参数确定电池模块内部的多个电芯与电池模块的外壳之间的绝缘异常情况。
在一些可行的实施方式中，控制电路在根据上述内容计算得到电池模块内部的绝缘电阻之后，进一步的，可以根据预设的电阻阈值以及该绝缘电阻的比较结果，确定电池模块内部的多个电芯与外壳之间的绝缘异常情况。
在一些可行的实施方式中，本申请实施例提供的电池模块检测方法还包括，预先设置各个电芯对应的电压阈值区间，并在计算得到电池模块内部的绝缘电压后，在预设的多个电压阈值区间中，将该绝缘电压相对应的一个电压阈值区间确定为目标电压阈值区间。进一步的，控制电路可以将该目标电压阈值区间对应的电芯确定为具有绝缘异常情况的电芯，以使维修人员可以直接对该电池模块中工作异常的电芯进行维修更换，进而可以节约维修成本。
上述S102的具体实现方式可以参阅上述图3至图5中控制电路所执行的实现方式，本申请实施例在此不再赘述。
本申请实施例还提供了一种非易失性计算机可读存储介质，该非易失性计算机可读存储介质存储有计算机程序，该计算机程序被处理器执行以实现上述图6及其可能的方法实施例中任一实施例前述方法中控制电路所做的操作。
本申请实施例还提供一种计算机程序产品，当该计算机程序产品被计算机读取并执行时，上述图6及其可能的方法实施例中任一实施例前述方法中控制电路所做的操作将被执行。
本申请实施例还提供了一种供电设备，请参阅图7，图7是本申请实施例提供的供电设备的一结构示意图。图7中，供电设备包括电池模块、电池管理系统和上述各种可能的实施方式中的电池模块检测系统。其中，电池模块分别与上述电池模块检测系统、电池管理系统电连接。该电池模块检测系统用于检测电池模块内部的绝缘异常情况，并根据电池模块内部的绝缘异常情况生成检测结果。上述电池模块检测系统与电池管理系统连接，可以发送上述检测结果给电池管理系统。进一步的，电池管理系统可以根据检测结果输出异常提示或者正常提示。
在一些可行的实施方式中，上述电池模块包括至少两个串联连接的电芯。具体的，请参阅图3和图4所示电池模块的具体实现，本申请在此不作赘述。
由此可见，上述电池模块检测系统实施例中的内容均适用于本供电设备的实施例中，本供电设备实施例所具体实现的功能与上述电池模块检测系统实施例相同，并且达到的有益效果与上述电池模块检测系统实施例所达到的有益效果也相同。
本申请实施例还提供了一种电池信息采集器，请参阅图8，该电池信息采集器包括上述各种可能的实 施方式中的电池模块检测系统。
由此可见，上述电池模块检测系统实施例中的内容均适用于本电池信息采集器的实施例中，本电池信息采集器实施例所具体实现的功能与上述电池模块检测系统实施例相同，并且达到的有益效果与上述电池模块检测系统实施例所达到的有益效果也相同。
本申请实施例还提供了一种电动设备，请参阅图9，该电动设备包括上述各种可能的实施方式中的供电设备。示例性的，在一些应用场景中，上述电动设备可以是电动汽车、家用电器、终端设备等具有电池模块的用电设备，本申请实施例对此不作限定。
由此可见，上述供电设备实施例中的内容均适用于本电动设备的实施例中，本电动设备实施例所具体实现的功能与上述供电设备实施例相同，并且达到的有益效果与上述供电设备实施例所达到的有益效果也相同。
需要说明的是，对于前述的各方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本申请并不受所描述的动作顺序的限制，因为依据本申请，某些步骤可能可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本申请所必须的。
在本申请所提供的实施例中，应该理解到，所揭露的系统，可通过其它的方式实现。例如，以上所描述的系统实施例仅仅是示意性的，例如上述模块的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，系统或单元的间接耦合或通信连接，可以是电性或其它的形式。
上述作为分离部件说明的模块可以是或者也可以不是物理上分开的，作为模块显示的部件可以是或者也可以不是物理模块，即可以位于一个地方，或者也可以分布到多个网络模块上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。
另外，在本申请各实施例中的各功能模块可以集成在一个处理模块中，也可以是各个模块单独物理存在，也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
以上对本申请实施例进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请及其核心思想；同时，对于本领域的一般技术人员，依据本申请的思想，在具体实现方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (22)

  1. 一种电池模块检测系统(300)，其特征在于，所述系统(300)包括控制电路(301)和检测电路(302)，所述检测电路(302)用于电连接至电池模块(320)的外壳(330)，所述检测电路(302)包括电阻单元，所述控制电路(301)连接至所述检测电路(302)，并且所述控制电路(301)用于：
    控制将电源电压传输给所述检测电路(302)，并获取所述检测电路(302)反馈的检测电压；以及
    根据所述电源电压、所述检测电压以及所述电阻单元的阻值，确定所述电池模块(320)内部的检测参数，并根据所述电池模块(320)内部的检测参数，确定所述电池模块(320)内部是否存在绝缘异常情况。
  2. 根据权利要求1所述的系统(300)，其特征在于，所述电源电压包括第一电源电压，所述检测电压包括所述检测电路(302)所反馈的第一检测电压；所述电池模块(320)内部的检测参数包括所述电池模块(320)的绝缘电阻；以及
    所述控制电路(301)用于根据所述第一电源电压、所述第一检测电压、所述电阻单元的阻值，确定得到所述电池模块(320)的绝缘电阻，并根据所述电池模块(320)的绝缘电阻与预设的电阻阈值，确定所述电池模块(320)内部的多个电芯与所述电池模块(320)的外壳(330)之间是否存在绝缘异常情况。
  3. 根据权利要求1或2所述的系统(300)，其特征在于，所述电源电压包括第一电源电压和第二电源电压，所述检测电压包括第一检测电压和第二检测电压，所述第一检测电压为所述电源电压为所述第一电源电压时，所述检测电路(302)所反馈的检测电压；所述第二检测电压为所述电源电压为所述第二电源电压时，所述检测电路(302)所反馈的检测电压；所述电池模块(320)内部的检测参数包括所述电池模块(320)的绝缘电阻；以及
    所述控制电路(301)用于根据所述第一电源电压、所述第二电源电压、所述第一检测电压、所述第二检测电压、所述电阻单元的阻值，确定所述电池模块(320)的绝缘电阻，并根据所述电池模块(320)的绝缘电阻与预设的电阻阈值，确定所述电池模块(320)内部的多个电芯与所述电池模块(320)的外壳(330)之间是否存在绝缘异常情况。
  4. 根据权利要求3所述的系统(300)，其特征在于，所述电池模块(320)内部的检测参数还包括所述电池模块(320)的绝缘电压；以及
    所述控制电路(301)用于根据所述第一电源电压、所述第二电源电压、所述第一检测电压、所述第二检测电压、所述电阻单元的阻值，确定所述电池模块(320)的绝缘电压，当所述绝缘电阻小于所述预设的电阻阈值时，根据所述电池模块(320)的绝缘电压从所述电池模块(320)内部的多个电芯中确定出 具有绝缘异常情况的电芯。
  5. 根据权利要求2-4中任一项所述的系统(300)，其特征在于，所述控制电路(301)用于在所述绝缘电阻小于所述预设的电阻阈值时，将所述电池模块(320)内部的与获取到的目标电压阈值区间对应的电芯确定为具有绝缘异常情况的电芯。
  6. 根据权利要求1-5任一项所述的系统(300)，其特征在于，所述电阻单元包括第一电阻、第二电阻、第三电阻、第四电阻以及第五电阻；
    所述第一电阻的一端连接所述控制电路(301)的第一端口，所述第一电阻的另一端分别连接所述第二电阻的一端、所述第三电阻的一端以及所述第四电阻的一端，所述第二电阻的另一端连接所述控制电路(301)的第二端口，所述第三电阻的另一端、所述第四电阻的另一端、所述第三电阻的另一端及所述第五电阻的一端均接地，所述第五电阻的另一端连接所述电池模块(320)的外壳(330)；以及
    所述控制电路(301)用于通过所述第一端口传输所述电源电压并通过所述第二端口获取所述检测电压。
  7. 根据权利要求6所述的系统(300)，其特征在于，所述电源电压包括第一电源电压，所述检测电压包括所述检测电路(302)所反馈的第一检测电压；所述控制电路(301)用于根据所述第一电源电压、所述第一检测电压、所述电阻单元的阻值，确定得到所述电池模块(320)的绝缘电阻，包括：
    所述控制电路(301)用于根据以下公式计算得到所述电池模块(320)内部的绝缘电阻：
    其中，R为所述绝缘电阻的阻值，U1为所述第一检测电压，V1为所述第一电源电压，R1为所述第一电阻的阻值，R2为所述第二电阻的阻值，R3为所述第三电阻的阻值，R4为所述第四电阻的阻值，R5为所述第五电阻的阻值。
  8. 根据权利要求6或7所述的系统，其特征在于，所述电源电压包括第一电源电压和第二电源电压，所述检测电压包括第一检测电压和第二检测电压；所述控制电路(301)用于根据所述第一电源电压、所述第二电源电压、所述第一检测电压、所述第二检测电压、所述电阻单元的阻值，确定所述电池模块(320)的绝缘电阻，包括：
    所述控制电路(301)用于根据以下公式计算得到所述电池模块(320)的绝缘电阻：
    其中，R为所述绝缘电阻的阻值，U1为所述第一检测电压，U2为所述第二检测电压，V1为所述第一电源电压，V2为所述第二电源电压，R1为所述第一电阻的阻值，R2为所述第二电阻的阻值，R3为所述第三电阻的阻值，R4为所述第四电阻的阻值，R5为所述第五电阻的阻值。
  9. 根据权利要求6-8中任一项所述的系统(300)，其特征在于，所述电源电压包括第一电源电压和第二电源电压，所述检测电压包括第一检测电压和第二检测电压；所述控制电路(301)用于根据以下公式计算得到所述电池模块(320)的绝缘电压：
    其中，Ux为所述绝缘电压，U1为所述第一检测电压，U2为所述第二检测电压，V1为所述第一电源电压，V2为所述第二电源电压，R1为所述第一电阻的阻值，R2为所述第二电阻的阻值，R3为所述第三电阻的阻值，R4为所述第四电阻的阻值，R5为所述第五电阻的阻值。
  10. 根据权利要求6-9中任一项所述的系统(300)，其特征在于，所述检测电路(302)还包括第一电容(C1)和第二电容(C2)；以及
    所述第一电容(C1)与所述第三电阻并联连接，所述第二电容(C2)的一端连接所述第四电阻的另一端，所述第二电容(C2)的另一端接地。
  11. 根据权利要求6-10中任一项所述的系统(300)，其特征在于，所述检测电路(302)还包括第一二极管(D1)和第二二极管(D2)；以及
    所述第一二极管(D1)的正极连接所述控制电路(301)的第一端口，所述第一二极管(D1)的负极连接所述第二电阻的一端；所述第二二极管(D2)的负极连接所述控制电路(301)的第二端口，所述第二二极管(D2)的正极接地。
  12. 一种电池模块检测方法，其特征在于，所述方法由电池模块检测系统执行，所述电池模块检测系统包括控制电路以及与所述控制电路连接的检测电路，所述检测电路电连接至电池模块的外壳并且包括电阻单元，所述方法包括：
    所述控制电路控制(S101)将电源电压传输给所述检测电路，并获取所述检测电路反馈的检测电压；以及
    所述控制电路根据所述电源电压、所述检测电压以及所述电阻单元的阻值，确定所述电池模块内部的检测参数，并根据所述电池模块内部的检测参数，确定(S102)所述电池模块内部是否存在绝缘异常情况。
  13. 根据权利要求12所述的方法，其特征在于，所述电源电压包括第一电源电压，所述检测电压包括所述检测电路所反馈的第一检测电压；所述电池模块内部的检测参数包括所述电池模块的绝缘电阻；
    所述根据所述电源电压、所述检测电压以及所述电阻单元的阻值，确定所述电池模块内部的检测参数，并根据所述电池模块内部的检测参数，确定所述电池模块内部是否存在绝缘异常情况，包括：
    根据所述第一电源电压、所述第一检测电压、所述电阻单元的阻值，确定得到所述电池模块的绝缘电阻，并根据所述电池模块的绝缘电阻与预设的电阻阈值，确定所述电池模块内部的多个电芯与所述电池模块的外壳之间是否存在绝缘异常情况。
  14. 根据权利要求13所述的方法，其特征在于，所述电源电压包括第一电源电压和第二电源电压，所述检测电压包括第一检测电压和第二检测电压，所述第一检测电压为所述电源电压为所述第一电源电压时，所述检测电路所反馈的检测电压；所述第二检测电压为所述电源电压为所述第二电源电压时，所述检测电路所反馈的检测电压；所述电池模块内部的检测参数包括所述电池模块的绝缘电阻；
    所述根据所述电源电压、所述检测电压以及所述电阻单元的阻值，确定所述电池模块内部的检测参数，并根据所述电池模块内部的检测参数，确定所述电池模块内部是否存在绝缘异常情况，包括：
    根据所述第一电源电压、所述第二电源电压、所述第一检测电压、所述第二检测电压、所述电阻单元的阻值，确定所述电池模块的绝缘电阻，并根据所述电池模块的绝缘电阻与预设的电阻阈值，确定所述电池模块内部的多个电芯与所述电池模块的外壳之间是否存在绝缘异常情况。
  15. 根据权利要求13或14所述的方法，其特征在于，所述电源电压包括第一电源电压和第二电源电压，所述检测电压包括第一检测电压和第二检测电压，所述电池模块内部的检测参数还包括所述电池模块的绝缘电压；
    所述根据所述电源电压、所述检测电压以及所述电阻单元的阻值，确定所述电池模块内部的检测参数，并根据所述电池模块内部的检测参数，确定所述电池模块内部是否存在绝缘异常情况，包括：
    所述控制电路用于根据所述第一电源电压、所述第二电源电压、所述第一检测电压、所述第二检测电压、所述电阻单元的阻值，确定所述电池模块的绝缘电压，当所述绝缘电阻小于所述预设的电阻阈值时，根据所述电池模块的绝缘电压从所述电池模块内部的多个电芯中确定出具有绝缘异常情况的电芯。
  16. 根据权利要求13-15中任一项所述的方法，其特征在于，所述当所述绝缘电阻小于所述预设的电阻阈值时，根据所述电池模块的绝缘电压，从所述电池模块内部的多个电芯中确定出具有绝缘异常情况的电芯，包括：
    在所述绝缘电阻小于所述预设的电阻阈值时，将所述电池模块内部的与获取到的目标电压阈值区间对应的电芯确定为具有绝缘异常情况的电芯。
  17. 一种非易失性计算机可读存储介质，其特征在于，所述非易失性计算机可读存储介质中存储有计算机程序，所述计算机程序适用于由处理器加载并执行，以使得具有所述处理器的计算机设备执行权利要求12-16中任一项所述的方法。
  18. 一种计算机程序产品，其特征在于，所述计算机程序产品被处理器执行时，权利要求12-16中任一项所述的方法将被实现。
  19. 一种电池信息采集器，其特征在于，所述电池信息采集器包括权利要求1-11中任一项所述的电池模块检测系统(300)。
  20. 一种供电设备，其特征在于，包括电池模块、电池管理系统及如权利要求1-11中任一项所述的电 池模块检测系统(300)或如权利要求19所述的电池信息采集器；
    所述电池模块检测系统用于检测所述电池模块内部的绝缘异常情况，并根据所述电池模块内部的绝缘异常情况生成检测结果，并将所述检测结果发送给所述电池管理系统；
    所述电池管理系统用于根据所述检测结果输出异常提示或者正常提示。
  21. 根据权利要求20所述的供电设备，其特征在于，所述电池模块包括至少两个串联连接的电芯。
  22. 一种电动设备，所述电动设备包括如权利要求20或权利要求21所述的供电设备。
PCT/CN2024/121611 2023-11-30 2024-09-27 电池模块检测系统及其方法 Pending WO2025112876A1 (zh)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002251985A (ja) * 2000-12-21 2002-09-06 Sony Corp 電解液漏洩検出機能付きバッテリパックおよび電解液漏洩検出方法
JP2006164532A (ja) * 2004-12-02 2006-06-22 Toyota Motor Corp 電池
KR20110053004A (ko) * 2009-11-13 2011-05-19 주식회사 엘지화학 배터리 셀 전해액의 누출을 감지하여 배터리 팩을 보호하는 장치 및 방법
CN103674454A (zh) * 2012-09-24 2014-03-26 微宏动力系统（湖州）有限公司 电池组漏液检测系统
CN115020836A (zh) * 2022-08-05 2022-09-06 宁德时代新能源科技股份有限公司 电芯预警方法、装置、系统、设备、介质和程序产品
CN117039210A (zh) * 2022-12-29 2023-11-10 华为数字能源技术有限公司 一种电池包
CN117543116A (zh) * 2023-11-08 2024-02-09 惠州亿纬锂能股份有限公司 一种电池包热失控的数据获取装置、方法、电子设备和存储介质
CN118226131A (zh) * 2023-11-30 2024-06-21 比亚迪股份有限公司 电池模块检测系统及其方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103675684B (zh) * 2012-09-13 2016-06-29 深圳华粤宝电池有限公司 一种测定电池组漏电的系统和方法
KR101746141B1 (ko) * 2015-03-10 2017-06-13 주식회사 엘지화학 절연저항측정 장치 및 방법
CN109884534B (zh) * 2019-02-28 2021-04-13 蜂巢能源科技有限公司 动力电池包参数检测方法及检测装置
CN114755597A (zh) * 2022-05-06 2022-07-15 蓝谷智慧(北京)能源科技有限公司 梯次储能系统中梯次电池包的绝缘检测方法及装置
CN116222895A (zh) * 2022-10-21 2023-06-06 杭州高特电子设备股份有限公司 一种用于金属壳体电池的电池漏液检测装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002251985A (ja) * 2000-12-21 2002-09-06 Sony Corp 電解液漏洩検出機能付きバッテリパックおよび電解液漏洩検出方法
JP2006164532A (ja) * 2004-12-02 2006-06-22 Toyota Motor Corp 電池
KR20110053004A (ko) * 2009-11-13 2011-05-19 주식회사 엘지화학 배터리 셀 전해액의 누출을 감지하여 배터리 팩을 보호하는 장치 및 방법
CN103674454A (zh) * 2012-09-24 2014-03-26 微宏动力系统（湖州）有限公司 电池组漏液检测系统
CN115020836A (zh) * 2022-08-05 2022-09-06 宁德时代新能源科技股份有限公司 电芯预警方法、装置、系统、设备、介质和程序产品
CN117039210A (zh) * 2022-12-29 2023-11-10 华为数字能源技术有限公司 一种电池包
CN117543116A (zh) * 2023-11-08 2024-02-09 惠州亿纬锂能股份有限公司 一种电池包热失控的数据获取装置、方法、电子设备和存储介质
CN118226131A (zh) * 2023-11-30 2024-06-21 比亚迪股份有限公司 电池模块检测系统及其方法

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