Safety testing device for battery module

Abstract

The utility model discloses a safety testing device for a battery module. The device comprises a detection power supply and simulation external resistors which are in one-to-one correspondence with to-be-tested battery cell pairs. The positive electrode of the detection power supply is connected with the negative electrode of one battery cell in the to-be-detected battery cell pair, and the negative electrode of the detection power supply is connected with the positive electrode of the other battery cell in the to-be-detected battery cell pair. The two ends of the simulation external resistor are respectively connected with the insulating outer surfaces of the two cells in the corresponding to-be-tested cell pair, thereby achieving the paired testing of the cells in the battery module. And a single simulation external resistor can be correspondingly connected with two battery cells, so that compared with a one-to-one simulation test scheme, the detection cost and the size of the test device are greatly reduced, and the test efficiency is improved. The resistance value of the simulation external resistor is related to the required simulation environment parameters, and the resistance value of the resistor can be used for simulating tests in different environments, so that the tests are closer to the actual application environment, and the test accuracy is improved.

Description

Technical Field

[0001] The utility model relates to energy storage battery technology, and in particular to a safety testing device for a battery module. Background Art

[0002] The current mainstream method for testing battery safety performance is to conduct experimental tests and verification on batteries in accordance with national or international standards. However, the efficiency of the test is low and the cost is high when using existing verification equipment to conduct experimental tests and verification on battery packs or battery groups. Utility Model Content

[0003] The utility model provides a safety test device for a battery module, which improves the test efficiency while reducing the test cost of the battery module.

[0004] The embodiment of the utility model provides a safety test device for a battery module, the device comprising: a detection power supply and a simulated external resistor corresponding one-to-one to the battery cell to be tested;

[0005] The positive electrode of the detection power supply is connected to the negative electrode of one of the battery cells to be tested, and the negative electrode of the detection power supply is connected to the positive electrode of the other battery cell in the battery cell pair to be tested;

[0006] The two ends of the simulated external resistor are respectively connected to the insulating outer surfaces of the two battery cells in the corresponding pair of battery cells to be tested.

[0007] Optionally, the simulated external resistor includes a resistor with adjustable resistance.

[0008] Optionally, the simulated external resistor includes at least one resistor with a preset resistance.

[0009] Optionally, the number of pairs of battery cells to be tested is greater than 1.

[0010] Optionally, the resistance values ​​of the simulated external resistors corresponding to different pairs of cells to be tested are the same.

[0011] Optionally, the resistance values ​​of the simulated external resistors corresponding to different pairs of cells to be tested are different.

[0012] Optionally, the safety testing device of the battery module further includes a monitoring module, the monitoring module includes a data monitoring unit and a voltage detection unit, the voltage detection unit is connected to the battery cell; the data monitoring unit is connected to the voltage detection unit.

[0013] Optionally, the monitoring module further includes a pressure relief and explosion-proof unit corresponding to each of the battery cells, and the pressure relief and explosion-proof unit is arranged on the corresponding battery cell; the data monitoring unit is also connected to the pressure relief and explosion-proof unit.

[0014] Optionally, the monitoring module further includes a temperature detection unit, which is disposed at the battery cell; and the data monitoring unit is also connected to the temperature detection unit.

[0015] Optionally, the monitoring module further includes a smoke detection unit, which is disposed at the battery cell; and the data monitoring unit is also connected to the smoke detection unit.

[0016] The safety testing device for the battery module provided in the embodiment of the present application is provided with a detection power supply and a simulated external resistor corresponding to the pair of cells to be tested. The positive pole of the detection power supply is connected to the negative pole of one cell in the pair of cells to be tested, and the negative pole of the detection power supply is connected to the positive pole of the other cell in the pair of cells to be tested. The two ends of the simulated external resistor are respectively connected to the insulating outer surfaces of the two cells in the corresponding pair of cells to be tested, wherein the resistance value of the simulated external resistor is related to the simulated environmental parameters, thereby realizing paired testing of the cells in the battery module. On the one hand, a single simulated external resistor can be connected to two cells in correspondence, which greatly reduces the detection cost and improves the test efficiency compared to a one-to-one simulation test solution. On the other hand, the resistance value of the simulated external resistor is related to the required simulated environmental parameters, and the resistance value of the resistor can be used to simulate tests under different environments, so that the test is closer to the actual application environment and the accuracy of the test is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the composition of a battery module safety testing device provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of another battery module safety testing device provided by an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the composition of another battery module safety testing device provided by an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the composition of another battery module safety testing device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0022] The inventors have found that the safety of the battery is closely related to the insulation performance of the battery. The rupture of the outer protective film, the presence of metal fragments in the outer shell, and the leakage of electrolyte to the surface of the shell may cause the insulation failure of the battery shell. Once the insulation failure of the battery shell occurs, the battery is at risk of external short circuit, and in severe cases, thermal runaway may be triggered. As mentioned in the background technology, the current mainstream method for testing the safety performance of batteries is to conduct experimental tests and verification of the batteries in accordance with national or international standards. However, the existing inspection devices often take too long to perform safety tests on battery modules including multiple single cells, and a large number of inspection devices are required, resulting in low test efficiency and high cost.

[0023] In order to solve the above problems, the utility model provides a safety testing device for a battery module. Figure 1 A schematic diagram of a battery module safety test device provided by the present utility model, referring to Figure 1 The safety test device 100 of the battery module includes a detection power supply 101 and a simulated external resistor 104 corresponding to the pair of cells to be tested 103. The positive electrode of the detection power supply 101 is connected to the negative electrode of one cell 102 in the pair of cells to be tested 103, and the negative electrode of the detection power supply 101 is connected to the positive electrode of the other cell 102 in the pair of cells to be tested 103. The two ends of the simulated external resistor 104 are respectively connected to the insulating outer surfaces of the two cells 102 in the pair of cells to be tested 103, wherein the resistance value of the simulated external resistor 104 is related to the simulated environmental parameters.

[0024] Specifically, the detection power supply 101 refers to a DC power supply for detection, which may include a voltage-controllable DC power supply device. The power supply voltage of the detection power supply 101 may be set according to the upper limit voltage of the battery cell 102 in the battery cell pair 103 to be tested. For example, when the upper limit voltage of one battery cell 102 in the battery cell pair 103 to be tested is 4.5V, the power supply voltage provided by the detection power supply 101 may be set to twice the upper limit voltage, that is, 9V. The setting of the detection power supply 101 also requires that the initial current value passing through the simulated external resistor 104 is below the protection current, wherein the protection current refers to the upper limit current of the battery pair to be tested in the test state without insulation failure, which may be measured experimentally or set according to empirical values. For example, the protection current of the battery cell pair 103 to be tested where the upper limit voltage is 4.5V can be 60mA.

[0025] The cell pair 103 to be tested refers to the paired cells 102 in the battery module to be tested, which can be adaptively replaced according to different test objects. The positive electrode of one cell 102 in the cell pair 103 to be tested is connected to the negative electrode of the detection power supply 101, and the negative electrode of the other cell 102 in the cell pair 103 to be tested is connected to the positive electrode of the detection power supply 101. The detection power supply 101 provides the test power supply for the cell pair 103 to simulate the working state of the cell to be tested. The number of pairs of cells 103 to be tested simultaneously by the safety test device can be set according to the number of cells 102 included in the battery module. For example, the number of pairs of cells 103 to be tested can be equal to 1. If the battery module includes 2 cells 102, then the safety test device can be used to test 1 pair of cells to be tested. The number of pairs of cells 103 to be tested can also be greater than 1. If the battery module includes 2n cells 102, then the safety test device can be used to test n pairs of cells to be tested, where n is an integer greater than

[0026] During operation, the battery cells 102 in the battery module may be in various working environments, and the resistance between the insulating shells of different battery cells 102 in the battery module may be different under different working environments, so that the corrosion rate and degree of the insulating shell of the battery cell 102 are also different. In the embodiment of the present application, a simulated external resistor 104 corresponding to the battery cell pair 103 to be tested is set, connected between the insulating shells of the two battery cells 102 in the corresponding battery cell pair 103 to be tested, and the simulated external resistor 104 can simulate the resistance between the insulating shells of the battery cells 102 in the battery module under different environments. The resistance of the simulated external resistor 104 is related to the simulated environmental parameters (referred to as simulated environmental parameters). For example, the higher the humidity value in the environment to be simulated by a certain battery cell pair 103 to be tested, the smaller the resistance value of the corresponding simulated external resistor 104 can be set; if the environment to be simulated by a certain battery cell pair 103 to be tested is that there is electrolyte leakage of the battery cell 102 in the module, the corresponding simulated external resistor 104 can be set to be smaller than the resistance value of the simulated external resistor 104 corresponding to the simulated environment when it is humid.

[0027] Exemplarily, when a battery module is safety tested, the tester can adjust the state of charge of each battery cell 102 in the battery module to a uniform value in advance, for example, the uniform value can be 100%. The battery cells 102 in the battery module are formed into non-repetitive battery pairs to be tested, and then the positive pole of the detection power supply 101 is respectively connected to the negative pole of one battery cell 102 in each battery pair to be tested, and the negative pole of the detection power supply 101 is respectively connected to the positive pole of the other battery cell 102 in each battery pair to be tested. Then the simulated external resistor 104 is connected between the insulating shells of the two battery cells 102 in the corresponding battery cell pair 103 to be tested. After these preparations are done, the safety test begins. The tester can monitor the state parameters of each battery cell pair 103 to be tested or observe the appearance changes of each battery cell 102 in the battery module within a preset time period. If the monitored state parameters or appearance are abnormal, it can indicate that the insulation failure of the battery cell 102 has occurred, so the safety level of the battery module under the simulated environmental parameters can be determined based on the time between the start of the test and the occurrence of insulation failure. For example, if no abnormal state parameters or appearance of any battery cell 102 are detected within the preset time period, the safety of the battery module can be determined to be high; if the time between the start of the test and the occurrence of insulation failure is greater than 80% of the preset time period, the safety level of the battery module can be determined to be medium; if the time between the start of the test and the occurrence of insulation failure is less than 80% of the preset time period, the safety level of the battery module can be determined to be low.

[0028] The safety testing device for the battery module provided in this embodiment is provided with a detection power supply and a simulated external resistor corresponding to the pair of cells to be tested. The positive pole of the detection power supply is connected to the negative pole of one cell in the pair of cells to be tested, and the negative pole of the detection power supply is connected to the positive pole of the other cell in the pair of cells to be tested. The two ends of the simulated external resistor are respectively connected to the insulating outer surfaces of the two cells in the corresponding pair of cells to be tested, wherein the resistance value of the simulated external resistor is related to the simulated environmental parameters, thereby realizing paired testing of the cells in the battery module. On the one hand, a single simulated external resistor can be connected to two cells, which greatly reduces the detection cost and improves the test efficiency compared to a one-to-one simulation test solution. On the other hand, the resistance value of the simulated external resistor is related to the required simulated environmental parameters, and the resistance value of the resistor can be used to simulate tests under different environments, so that the test is closer to the actual application environment and the accuracy of the test is improved.

[0029] Optionally, Figure 2 A schematic diagram of another battery module safety test device provided by the present utility model embodiment, based on the above embodiment, referring to Figure 2 , the number of pairs of cells to be tested 103 is greater than 1, and the resistance values ​​of the simulated external resistors 104 corresponding to different cell pairs to be tested 103 are the same.

[0030] Specifically, the simulated external resistors 104 corresponding to different pairs of battery cells 103 to be tested may be the same. For example, if the requirement for the safety test is to test the safety of the battery cells 102 in the battery module under the same simulated environmental parameters, then the resistance values ​​of the simulated external resistors 104 corresponding to each pair of battery cells 103 to be tested in the battery module may be set to be the same. Such a setting can complete the safety test of the battery cells 102 in the battery module under similar environmental conditions.

[0031] Optionally, based on the above embodiment, continue to refer to Figure 2 , the number of pairs of cells to be tested 103 is greater than 1, and the resistance values ​​of the simulated external resistors 104 corresponding to different cell pairs to be tested 103 are the same.

[0032] Specifically, the simulated external resistors 104 corresponding to different pairs of battery cells 103 to be tested may be different. For example, if the requirement of the safety test is to test the safety of battery cells 102 pairs in the battery module under different simulated environmental parameters, then the resistance values ​​of the simulated external resistors 104 corresponding to each pair of battery cells 103 to be tested in the battery module may be set to be different. Such a setting can complete the safety test of the battery cells 102 in the battery module when the environment is more complex.

[0033] Optionally, Figure 3 A schematic diagram of another battery module safety test device provided by the present utility model embodiment, based on the above embodiment, referring to Figure 3 The simulated external resistor 104 includes an adjustable resistance resistor, and the adjustable values ​​of the adjustable resistance resistor are respectively related to different simulation environment parameters in a one-to-one correspondence.

[0034] Specifically, the adjustable resistance resistor refers to a resistor whose resistance can be changed artificially. Exemplarily, the adjustable resistance resistor may include a resistor box with multiple adjustable resistance values. The adjustable value refers to the resistance value that the adjustable resistor can set. Exemplarily, the adjustable value can be a preset range, such as between 10kΩ and 50kΩ, and the adjustable value can also be a plurality of fixed values ​​within the preset range, for example, five values ​​of 10kΩ, 20kΩ, 30kΩ, 40kΩ and 50kΩ. In the case where the adjustable value is a plurality of fixed values ​​within the preset range, each adjustable value is respectively related to a different simulated environmental parameter in a one-to-one correspondence. Exemplarily, the simulated environmental parameters are 50%, 60%, 70% and 80% of humidity, which can be respectively related to 50kΩ, 40kΩ, 30kΩ and 20kΩ of the adjustable resistance; the simulated environmental parameter is electrolyte leakage, which can be related to 10kΩ of the tissue adjustable resistance.

[0035] When testing the safety of a battery module under a certain simulated environmental parameter, each adjustable resistance in the safety test device can be adjusted to the resistance corresponding to the simulated environmental parameter. When testing the safety of a battery module under a composite simulated environmental parameter, each adjustable resistance in the safety test device can be adjusted to different resistances. After completing the safety test of the battery module under one environment, the test under the next environment can be continued by adjusting the resistance of the simulated external resistor 104, avoiding the step of replacing the simulated external resistor 104 between different tests, making the test easier.

[0036] In the safety testing device for the battery module provided in this embodiment, the simulated external resistor is set as an adjustable resistance resistor, and the adjustable values ​​of the adjustable resistance resistor are respectively related to different simulated environmental parameters one by one. The safety test of the battery module under different simulated environmental parameters is achieved by adjusting the resistance value, avoiding the replacement of resistors between different tests, and expanding the scope of application of the safety testing device.

[0037] Optionally, based on the foregoing embodiment, the simulated external resistor may further include at least one resistor with a preset resistance.

[0038] Specifically, there can be one preset resistance resistor, and the resistance of the resistor is correspondingly related to the required simulation environment parameter. There can also be multiple preset resistance resistors. On the one hand, the preset resistance values ​​of each preset resistance resistor can be different, and each preset resistance resistor with different resistance values ​​is connected in parallel. By switching the on and off of the switch device on the parallel branch where the preset resistance resistor is located, the simulated external resistors with different resistance values ​​can be switched to realize the simulation of different simulation environment parameters. On the other hand, the preset resistance values ​​of each preset resistor can be the same, and all preset resistance resistors are connected in series. By switching the on and off of the switch device directly connected to the preset resistance resistor, the selection of the total resistance in the connected resistance string is completed to realize the simulation of different simulation environment parameters.

[0039] Optionally, Figure 4 A schematic diagram of another battery module safety test device provided in an embodiment of the utility model is provided for the purpose of clear and concise display. Figure 4 The connection relationship between the monitoring module and other components is omitted. Figure 4 The battery module safety testing device 100 further includes a monitoring module 400 , which includes a data monitoring unit 401 and a voltage detection unit 402 , wherein the voltage detection unit 402 is connected to the battery cell 102 ; the data monitoring unit 401 is connected to the voltage detection unit 402 .

[0040] Specifically, the monitoring module 400 refers to a component that monitors the state and / or parameters of the battery cell 102 in the battery module during the test. The voltage detection unit 402 refers to a sensing component for detecting the voltage data of the battery cell 102 in the battery module, which can be connected to each battery cell 102 in the battery module to obtain the voltage data at both ends of each battery cell 102. The data monitoring unit 401 is the control and judgment center in the monitoring module 400, and can judge whether each battery cell 102 has a voltage drop abnormality according to the voltage data obtained by the voltage detection unit 402. For example, when it is detected that the voltage drop value of a certain or a pair of battery cells 102 exceeds the preset voltage value within a unit time, the data monitoring unit 401 can determine that the corresponding battery cell 102 has a voltage drop abnormality and terminate the test, and then determine the safety of the battery module according to the test duration of this time. In addition, the voltage detection unit 402 can also be connected to the insulating shell of the detection power supply 101 and / or each battery cell 102 to detect the voltage drop of the power supply and the change of the shell voltage, and assist in safety testing.

[0041] Optionally, based on the above embodiment, continue to refer to Figure 4 The monitoring module 400 further includes a pressure relief and explosion proof unit 403 corresponding to each of the battery cells 102 , and the pressure relief and explosion proof unit 403 is disposed on the corresponding battery cell 102 . The data monitoring unit 401 is also connected to the pressure relief and explosion proof unit 403 .

[0042] Specifically, the pressure relief and explosion-proof unit 403 refers to an explosion-proof component arranged on the battery cell 102, which can prevent the explosion caused by excessive pressure in the battery cell 102. Exemplarily, the pressure relief and explosion-proof unit 403 may include an explosion-proof valve, which can be arranged on the positive electrode of the battery cell 102. When high pressure occurs inside the battery cell 102, the valve is opened for the battery cell 102 to relieve the pressure of the battery cell 102. The data monitoring unit 401 is also connected to the pressure relief and explosion-proof unit 403, and can obtain the state parameters of the pressure relief and explosion-proof unit 403, and then determine whether the battery cell 102 in the battery module has a high-voltage fault according to the state parameters of the pressure relief and explosion-proof unit 403. Exemplarily, when it is determined that the pressure of a certain battery cell 102 exceeds the normal range according to the state parameters of the pressure relief and explosion-proof unit 403, the data monitoring unit 401 can determine that the corresponding battery cell 102 has a high-voltage fault and terminate the test, and then determine the safety of the battery module according to the duration of this test.

[0043] Optionally, based on the above embodiment, continue to refer to Figure 4 The monitoring module 400 further includes a temperature detection unit 404, which is disposed at the battery cell 102. The data monitoring unit 401 is also connected to the temperature detection unit 404.

[0044] Specifically, the temperature detection unit 404 is a component for detecting the temperature inside the battery module, and may include a plurality of temperature sensing elements distributed at various positions inside the battery module. Exemplarily, the temperature detection unit 404 may include a temperature sensor corresponding to each battery cell 102, and the temperature sensor may be arranged on the surface or inside of the corresponding battery cell 102 to detect the temperature data of the corresponding battery cell 102. The data monitoring unit 401 is also connected to the temperature detection unit 404, and may obtain the temperature sensing data measured by the temperature detection unit 404, and then determine whether the battery cell 102 in the battery module has an over-temperature fault according to the temperature sensing data. Exemplarily, when it is determined that the surface temperature of a certain battery cell 102 exceeds the normal range according to the temperature sensing data of the temperature detection unit 404, the data monitoring unit 401 may determine that the corresponding battery cell 102 has an over-temperature fault and terminate the test, and then determine the safety of the battery module according to the duration of this test.

[0045] Optionally, based on the above embodiment, continue to refer to Figure 4 The monitoring module 400 also includes a smoke detection unit 405 , which is disposed at the battery cell 102 and is used to detect the smoke concentration at the location where the battery cell 102 is placed; the data monitoring unit 401 is also connected to the smoke detection unit 405 .

[0046] Specifically, the smoke detection unit 405 refers to a smoke concentration detection component arranged at the battery module, which may include smoke sensors distributed at various locations within the battery module, and the smoke sensors may detect smoke concentration data around the location. The data monitoring unit 401 is also connected to the smoke detection unit 405, and may obtain smoke concentration data detected by the smoke detection unit 405, and then determine whether a fire failure occurs in the battery module based on the smoke concentration data. For example, when the smoke concentration exceeds the normal range, the data monitoring unit 401 may determine that a fire failure occurs in the battery cell 102 in the battery module and terminate the test, and then determine the safety of the battery module based on the duration of this test.

[0047] Exemplarily, when a battery module is safety tested, the data monitoring unit 401 can control the charge and discharge assembly to adjust the state of charge of each battery cell 102 in the battery module to 100% in advance. Then the data monitoring unit 401 can connect the positive electrode of the detection power supply 101 to the negative electrode of one battery cell 102 in each battery pair to be tested, and connect the negative electrode of the detection power supply 101 to the positive electrode of another battery cell 102 in each battery pair to be tested, by controlling the on and off of the circuit switch, and connect the simulated external resistor 104 between the insulating shells of the two battery cells 102 in the corresponding battery pair 103 to be tested by controlling the on and off of the circuit switch. After these preparations are done, the safety test begins. During the 8-week test period, the data monitoring unit 401 can obtain the state parameters or sensing parameters of the voltage detection unit 402, the pressure relief and explosion-proof unit 403, the temperature detection unit 404 and the smoke detection unit 405. If any parameter is monitored to be abnormal, it can be determined that the insulation failure of the battery cell 102 has occurred, and the safety level of the battery module under the simulated environmental parameters can be determined based on the time between the start of the test and the occurrence of insulation failure. For example, if no abnormality in the state parameters or appearance of any battery cell 102 is detected within the 8-week test time, it can be determined that the safety of the battery module is high; if an insulation failure occurs between 6 and 8 weeks, it can be determined that the safety level of the battery module is medium; if an insulation failure occurs within 6 weeks, it can be determined that the safety level of the battery module is low. After determining that the insulation failure of the battery cell 102 has occurred, the data monitoring unit 401 can also cut off the power to the battery cell 102 by disconnecting the control line, and can also control the alarm component to remind and alarm the tester, thereby improving the reliability of the safety detection device.

[0048] The safety test device of the battery module provided by the utility model is provided with a detection power supply and a simulated external resistor corresponding to the pair of cells to be tested. The positive pole of the detection power supply is connected to the negative pole of one cell in the pair of cells to be tested, and the negative pole of the detection power supply is connected to the positive pole of the other cell in the pair of cells to be tested. The two ends of the simulated external resistor are respectively connected to the insulating outer surfaces of the two cells in the pair of cells to be tested, wherein the resistance value of the simulated external resistor is related to the simulated environmental parameters, thereby realizing the paired test of the cells in the battery module. On the one hand, a single simulated external resistor can be connected to two cells in correspondence, which greatly reduces the detection cost and the volume of the test device and improves the test efficiency compared to the one-to-one simulation test scheme. On the other hand, the resistance value of the simulated external resistor is related to the required simulated environmental parameters, and the resistance value of the resistor can be used to simulate the test under different environments, so that the test is closer to the actual application environment and the accuracy of the test is improved.

[0049] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery module safety testing device, characterized in that: include: Detect the power supply and the simulated external resistance corresponding to the battery cell to be tested; The positive electrode of the detection power supply is connected to the negative electrode of one of the battery cells to be tested, and the negative electrode of the detection power supply is connected to the positive electrode of the other battery cell in the battery cell pair to be tested; The two ends of the simulated external resistor are respectively connected to the insulating outer surfaces of the two battery cells in the corresponding pair of battery cells to be tested.

2. The safety testing device for a battery module according to claim 1, characterized in that: The simulated external resistor includes an adjustable resistance resistor.

3. The safety testing device for a battery module according to claim 1, characterized in that: The simulated external resistor includes at least one resistor with a preset resistance.

4. The safety testing device for a battery module according to claim 1, characterized in that: The number of pairs of battery cells to be tested is greater than 1.

5. The safety testing device for a battery module according to claim 4, characterized in that: The resistance values ​​of the simulated external resistors corresponding to different pairs of cells to be tested are the same.

6. The battery module safety testing device according to claim 4, characterized in that: The resistance values ​​of the simulated external resistors corresponding to different pairs of cells to be tested are different.

7. The safety testing device for a battery module according to any one of claims 1 to 6, characterized in that: It also includes a monitoring module, which includes a data monitoring unit and a voltage detection unit. The voltage detection unit is connected to the battery cell; the data monitoring unit is connected to the voltage detection unit.

8. The safety testing device for a battery module according to claim 7, characterized in that: The monitoring module also includes a pressure relief and explosion-proof unit corresponding to the battery cells one by one, and the pressure relief and explosion-proof unit is arranged on the corresponding battery cell; the data monitoring unit is also connected to the pressure relief and explosion-proof unit.

9. The safety testing device for a battery module according to claim 7, characterized in that: The monitoring module further includes a temperature detection unit, which is disposed at the battery cell; the data monitoring unit is also connected to the temperature detection unit.

10. The battery module safety testing device according to claim 7, characterized in that: The monitoring module further comprises a smoke detection unit, which is arranged at the battery cell; the data monitoring unit is also connected to the smoke detection unit.

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