Method, device, battery and vehicle for screening potential abnormal batteries

Abstract

The present invention provides a method, device, battery and vehicle for screening potential abnormal batteries, comprising the steps of: determining the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ; According to the determined performance parameters, determine whether the battery is qualified. The method, device, battery and vehicle for screening potential abnormal batteries provided by the present invention can avoid the problem of missed screening and reduce the risk of batteries at the application end.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a method, device, battery and vehicle for screening potential abnormal batteries. Background Art

[0002] In the prior art, in order to screen out batteries with potential abnormalities in advance, battery manufacturers usually develop process methods for screening battery self-discharge performance to improve the consistency and safety of subsequent battery use.

[0003] However, the existing method of screening the battery self-discharge performance still has a high missed screening rate, resulting in quality problems such as abnormal battery consistency and abnormal self-discharge at the application end. Summary of the invention

[0004] The present invention provides a method, device, battery and vehicle for screening potential abnormal batteries, which can avoid the problem of missed screening and reduce the risk of batteries at the application end.

[0005] A first aspect of the present invention provides a method for screening potential abnormal batteries, comprising the steps of:

[0006] Determine the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ;

[0007] Whether the battery is qualified is determined based on the determined performance parameters.

[0008] According to the method for screening potential abnormal batteries provided by the present invention, it is determined that the battery is short-circuited with an ultra-large resistor R EXT The self-discharge rate ΔV n ,include:

[0009] Under the preset temperature conditions, let the fully charged battery stand until the voltage is balanced, and then connect an external large resistor R EXT Short circuit, measure voltage V n1 ;

[0010] After the battery has been at rest for a preset time ΔT, measure the voltage V n2 ;

[0011] According to the formula ΔV n =(V n1 -V n2) / ΔT, and the self-discharge rate ΔV is calculated n .

[0012] According to the method for screening potential abnormal batteries provided by the present invention, the discharge DC internal resistance DCR of the battery is determined n1 ,include:

[0013] Under the preset temperature conditions, adjust the battery SOC to 50%;

[0014] After the battery rest time reaches the first preset time, measure the battery voltage V n3 ;

[0015] The battery is subjected to mC pulse discharge, and after reaching the second preset time, the battery voltage V is measured. n4 ;

[0016] According to the formula DCR n1 =(V n3 -V n4 ) / mC, the discharge DC internal resistance DCR is calculated n1 .

[0017] According to the method for screening potential abnormal batteries provided by the present invention, the charging DC internal resistance DCR of the battery is determined n2 ,include:

[0018] At the measured battery voltage V n4 After that, the battery is left to stand for a third preset time, and then the battery voltage V is measured. n5 ;

[0019] The battery is charged by mC pulse and after reaching the fourth preset time, the battery voltage V is measured. n6 ;

[0020] According to the formula DCR n2 =(V n6 -V n5 ) / mC, and calculate the charging DC internal resistance DCR n2 .

[0021] According to the method for screening potential abnormal batteries provided by the present invention, the ultra-large resistance R EXT ,include:

[0022] Select m groups of batteries and number them from 1 to m, where m ≥ 4; select m-1 kilo-ohm resistors and number them from R1 to R2 in descending order of resistance value. m-1 ;

[0023] When each battery group is fully charged, the batteries in each group are left to stand until the voltage is balanced;

[0024] The first group of batteries has no short-circuit resistor, and the second to mth groups of batteries are short-circuited R1 to R m-1 resistance;

[0025] According to the preset time interval, the voltage of the first group to the mth group of batteries is measured to obtain the voltage V1 to V m , determining the voltage drop of each group of batteries according to the voltage of each group of batteries obtained each time and the preset time interval;

[0026] Determine R1~R m-1 R k The super large resistor R EXT , where R is short-circuited k-1 The difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is less than the first preset value, short-circuit R k The difference between the voltage drop of the battery group and the voltage drop of the first group of batteries is greater than a second preset value, and the second preset value is greater than the first preset value.

[0027] According to the method for screening potential abnormal batteries provided by the present invention, the preset time ΔT is ≥ 36 hours.

[0028] According to the method for screening potential abnormal batteries provided by the present invention, the first preset time is 0.5 hours, the second preset time is 30 seconds, the third preset time is 5 minutes, and the fourth preset time is 30 seconds.

[0029] According to the method for screening potential abnormal batteries provided by the present invention, measuring the voltages of the first group to the mth group of batteries at a preset time interval includes:

[0030] The voltage of the first to mth groups of batteries is measured once every 24 hours, and each group of batteries is measured no less than 10 times in total.

[0031] A second aspect of the present invention provides a device for screening potential abnormal batteries, comprising:

[0032] The performance parameter acquisition module is used to determine the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ;

[0033] The judging module is used to judge whether the battery is qualified according to the performance parameters of the battery to be tested determined by the performance parameter acquisition module.

[0034] According to the device for screening potential abnormal batteries provided by the present invention, the performance parameter acquisition module includes a voltage measurement module, a calculation module and an ultra-large resistor R EXT , wherein the super large resistor R EXT It is used to short-circuit with the battery. The voltage measurement module is used to measure the battery voltage. The calculation module is used to calculate the self-discharge rate ΔV n .

[0035] According to the device for screening potentially abnormal batteries provided by the present invention, the performance parameter acquisition module further includes:

[0036] A battery SOC adjustment module, used to adjust the battery SOC;

[0037] The mC pulse charge and discharge module is used to perform mC pulse charge and discharge on the battery.

[0038] A third aspect of the present invention provides a battery, which determines whether there is a potential abnormality by using the method for screening potential abnormal batteries as described in any of the above items, or is provided with a device for screening potential abnormal batteries as described in any of the above items.

[0039] A fourth aspect of the present invention provides a vehicle provided with a device for screening a potential abnormal battery as described in any one of the above items, or a battery as described above.

[0040] Beneficial effects:

[0041] 1. The method for screening potential abnormal batteries provided by the present invention comprises the following steps:

[0042] Determine the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ;

[0043] Whether the battery is qualified is determined based on the determined performance parameters.

[0044] Thus, the screening method provided by the present invention comprehensively screens potential abnormal batteries through battery capacity, self-discharge test, charge and discharge DC resistance, and AC internal resistance, thereby reducing the probability of potential quality abnormal batteries being missed, thereby reducing the risk at the application end.

[0045] 2. In a further technical solution provided by the present invention, it is determined that the battery is short-circuited with the super large resistor R EXT The self-discharge rate ΔV n ,include:

[0046] Under the preset temperature conditions, let the fully charged battery stand until the voltage is balanced, and then connect an external large resistor R EXT Short circuit, measure voltage V n1 ;

[0047] After the battery has been at rest for a preset time ΔT, measure the voltage V n2 ;

[0048] According to the formula ΔV n =(V n1 -V n2 ) / ΔT, and the self-discharge rate ΔV is calculated n .

[0049] By shorting the large resistor R EXT Test the self-discharge rate ΔV by n , which can effectively test the self-discharge performance of the battery.

[0050] 3. In the further technical solution provided by the present invention, the ultra-large resistor R is determined EXT ,include:

[0051] Select m groups of batteries and number them from 1 to m, where m ≥ 4; select m-1 kilo-ohm resistors and number them from R1 to R2 in descending order of resistance value. m-1 ;

[0052] When each battery group is fully charged, the batteries in each group are left to stand until the voltage is balanced;

[0053] The first group of batteries has no short-circuit resistor, and the second to mth groups of batteries are short-circuited R1 to R m-1 resistance;

[0054] According to the preset time interval, the voltage of the first group to the mth group of batteries is measured to obtain the voltage V1 to V m , determining the voltage drop of each group of batteries according to the voltage of each group of batteries obtained each time and the preset time interval;

[0055] Determine R1~R m-1 R k The super large resistor R EXT , where R is short-circuited k-1 The difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is less than the first preset value, short-circuit R k The difference between the voltage drop of the battery group and the voltage drop of the first group of batteries is greater than a second preset value, and the second preset value is greater than the first preset value.

[0056] Thus, the above method can be used to determine the optimal super large resistor R used when screening batteries. EXT , thereby ensuring the accuracy of screening.

[0057] 4. The present invention also provides a device for screening potential abnormal batteries, comprising:

[0058] The performance parameter acquisition module is used to determine the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ;

[0059] The judging module is used to judge whether the battery is qualified according to the performance parameters of the battery to be tested determined by the performance parameter acquisition module.

[0060] With such a configuration, the screening device provided by the present invention can implement the above screening method. The screening device provided by the present invention can comprehensively screen potential abnormal batteries through battery capacity, self-discharge test, charge and discharge DC resistance, and AC internal resistance, thereby reducing the probability of potential quality abnormal batteries being missed, thereby reducing the risk at the application end. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought about by the above screening method, and will not be repeated here.

[0061] 5. The present invention also provides a battery and a vehicle, including the above-mentioned method for screening potential abnormal batteries and a device for screening potential abnormal batteries. With such a configuration, the battery and the vehicle provided by the present invention can also comprehensively screen potential abnormal batteries through battery capacity, self-discharge test, charge and discharge DC resistance, and AC internal resistance, thereby reducing the probability of potential quality abnormal batteries being missed, thereby reducing the risk on the application end. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0063] Figure 1 is a schematic diagram of a method for screening potential abnormal batteries in an embodiment of the present invention;

[0064] Figure 2 This is a method for determining the super large resistance R in the embodiment of the present invention.EXT Schematic diagram of the method. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] Combine the following Figure 1-Figure 2 The method for screening potential abnormal batteries in an embodiment of the present invention is described, and the method can be applied to the screening of lithium batteries, comprising the steps of:

[0067] S11, determining the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ;

[0068] S12, judging whether the battery is qualified according to the determined performance parameters.

[0069] In the prior art, the battery capacity, self-discharge rate and AC internal resistance are usually used for screening. In this embodiment, the self-discharge rate test method is improved, that is, the super large resistor R is short-circuited. EXT Measure the battery's self-discharge rate ΔV n , and combined with the test of charge and discharge DC internal resistance, it can be seen from the following table that the screening method provided in this embodiment significantly reduces the probability of missing the screening of potential quality abnormal batteries, thereby reducing the risk of the application end.

[0070]

[0071] In a further embodiment, it is determined that the battery is short-circuited with the ultra-large resistor R EXT The self-discharge rate ΔV n ,include:

[0072] Under the preset temperature conditions, let the fully charged battery stand until the voltage is balanced, and then connect an external large resistor R EXT Short circuit, measure voltage V n1 ; In some embodiments, the above-mentioned preset temperature condition may be a normal temperature condition;

[0073] After the battery has been at rest for a preset time ΔT, measure the voltage V n2 ; In some embodiments, the battery can be left at room temperature for more than 36 hours;

[0074] According to the formula ΔV n =(V n1 -V n2 ) / ΔT, and the self-discharge rate ΔV is calculated n .

[0075] With such configuration, the present embodiment optimizes the self-discharge rate test method, and the optimized self-discharge rate test method can more accurately screen out abnormal batteries.

[0076] In a further embodiment, the discharge DC internal resistance DCR of the battery is determined n1 ,include:

[0077] Under a preset temperature condition, adjusting the battery SOC (remaining power) to 50%; in some embodiments, the preset temperature condition may be a normal temperature condition;

[0078] After the battery rest time reaches the first preset time, measure the battery voltage V n3 ; In some embodiments, the battery rest time may be 0.5 hours;

[0079] The battery is subjected to mC pulse discharge, and after reaching the second preset time, the battery voltage V is measured. n4 ; In some embodiments, the duration of the mC pulse discharge may be 30 seconds;

[0080] According to the formula DCR n1 =(V n3 -V n4 ) / mC, the discharge DC internal resistance DCR is calculated n1 .

[0081] Thus, this embodiment provides an optimized discharge DC internal resistance DCR n1 Method, by which the discharge DC internal resistance DCR can be tested more accurately n1 , which can more accurately screen out abnormal batteries.

[0082] In a further technical solution, the charging DC internal resistance DCR of the battery is determined n2 ,include:

[0083] When measuring the battery voltage V n4 After that, the battery is left to stand for a third preset time, and then the battery voltage V is measured. n5 ; In some embodiments, the third preset time may be 5 minutes;

[0084] The battery is charged by mC pulse and after reaching the fourth preset time, the battery voltage V is measured. n6 ; In some embodiments, the fourth preset time may be 30 seconds;

[0085] According to the formula DCR n2 =(V n6 -V n5 ) / mC, and calculate the charging DC internal resistance DCR n2 .

[0086] Thus, this embodiment provides an optimized charging DC internal resistance DCR n1 Method, by which the charging DC internal resistance DCR can be tested more accurately n1 , which can more accurately screen out abnormal batteries.

[0087] In addition, it should be noted that when testing the self-discharge rate of the battery, a suitable short-circuited super-large resistor is required. In view of this, in a further embodiment, the super-large resistor R can be selected by the following method: EXT , the method comprising:

[0088] S21, select m groups of batteries, and number the battery groups in sequence from 1 to m, where m ≥ 4; select m-1 kilo-ohm resistors, and number the resistors in descending order from large to small resistance values ​​as R1 to R m-1 In some embodiments, batteries with good consistency in the same batch can be selected and divided into 7 groups, numbered 1 to 7. Six kilo-ohm-level external short-circuit resistors are selected, denoted as R1 to R6, and the resistance size is R1>R2>R3>R4>R5>R6;

[0089] S22, when each battery group is fully charged, allowing each battery group to stand until the voltage is balanced; in some embodiments, each battery group may be allowed to stand until the voltage is balanced under normal temperature conditions and when the battery is fully charged;

[0090] S23, the first group of batteries has no short-circuited resistor, and the second to seventh groups of batteries have short-circuited resistors R1 to R6 one by one;

[0091] S24, measuring the voltages of the first to seventh battery groups at preset time intervals to obtain voltages V1 to V7 of the first to seventh battery groups, and determining the voltage drop of each battery group according to the voltage of each battery group obtained each time and the preset time interval;

[0092] S25, determine R among R1 to R6 k For the large resistor R EXT , where R is short-circuited k-1The difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is less than the first preset value, short-circuit R k The difference between the voltage drop of the battery group and the voltage drop of the first battery group is greater than the second preset value, and the second preset value is greater than the first preset value. For example, when the external resistance is greater than R2, the battery voltage drop is almost the same as the voltage drop of the battery without short circuit, indicating that the short circuit resistance is greater than R2 and has no effect on the battery self-discharge; when the short circuit resistance is less than R2, the battery self-discharge deteriorates. At this time, R3 is set to the external short circuit resistance R during the test. EXT .

[0093] Thus, in the method provided in this embodiment, the short-circuit resistor R EXT , can accurately test the battery self-discharge rate, and then more accurately screen out abnormal batteries.

[0094] Furthermore, the above-mentioned measuring the voltages of the first to seventh groups of batteries at the preset time intervals includes:

[0095] The voltage of batteries in groups 1 to 7 is measured once every 24 hours, and each group of batteries is measured no less than 10 times in total, that is, the measurement is continued for 10 days.

[0096] In this way, the short-circuit resistor R can be selected more accurately by this method. EXT .

[0097] An embodiment of the present invention also provides a device for screening potential abnormal batteries, including:

[0098] The performance parameter acquisition module is used to determine the performance parameters of the battery to be tested, where the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ;

[0099] The judging module is used to judge whether the battery is qualified according to the performance parameters of the battery to be tested determined by the performance parameter acquisition module.

[0100] Furthermore, the performance parameter acquisition module includes a voltage measurement module, a calculation module and a super large resistor R EXT , where the super large resistor R EXT Used to short-circuit the battery, the voltage measurement module is used to measure the battery voltage; the calculation module is used to calculate the self-discharge rate ΔV n .

[0101] According to the device for screening potential abnormal batteries provided by the present invention, the performance parameter acquisition module further includes:

[0102] A battery SOC adjustment module, used to adjust the battery SOC;

[0103] The mC pulse charge and discharge module is used to perform mC pulse charge and discharge on the battery.

[0104] With such a configuration, the screening device provided in this embodiment can implement the above screening method. The screening device provided in this embodiment can comprehensively screen potential abnormal batteries through battery capacity, self-discharge test, charge and discharge DC resistance, and AC internal resistance, thereby reducing the probability of potential quality abnormal batteries being missed, thereby reducing the risk of the application end. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought about by the above screening method, and will not be repeated here.

[0105] An embodiment of the present invention also provides a battery and a vehicle, including the above-mentioned method for screening potential abnormal batteries and a device for screening potential abnormal batteries. With such a configuration, the battery and the vehicle provided in this embodiment can also comprehensively screen potential abnormal batteries through battery capacity, self-discharge test, charge and discharge DC resistance, and AC internal resistance, thereby reducing the probability of potential quality abnormal batteries being missed, thereby reducing the risk on the application end.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for screening potential abnormal batteries, characterized in that: Includes steps: Determine the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ; Judging whether the battery is qualified according to the determined performance parameters; Among them, determine the super large resistance R EXT ,include: Select m groups of batteries and number them from 1 to m, where m ≥ 4; select m-1 kilo-ohm resistors and number them from R1 to R2 in descending order of resistance value. m-1 ; When each battery group is fully charged, the batteries in each group are left to stand until the voltage is balanced; The first group of batteries has no short-circuit resistor, and the second to mth groups of batteries are short-circuited R1 to R m-1 resistance; According to the preset time interval, the voltage of the first group to the mth group of batteries is measured to obtain the voltage V1 to V m , determining the voltage drop of each group of batteries according to the voltage of each group of batteries obtained each time and the preset time interval; Determine R1~R m-1 R k The super large resistor R EXT , where R is short-circuited k-1 The difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is less than the first preset value, short-circuit R k The difference between the voltage drop of the battery group and the voltage drop of the first battery group is greater than a second preset value, and the second preset value is greater than the first preset value.

2. The method for screening potential abnormal batteries according to claim 1, characterized in that: Make sure the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n ,include: Under the preset temperature conditions, let the fully charged battery stand until the voltage is balanced, and then connect an external large resistor R EXT Short circuit, measure voltage V n1 ; After the battery has been at rest for a preset time ΔT, measure the voltage V n2 ; According to the formula ΔV n =(V n1 -V n2 ) / ΔT, and the self-discharge rate ΔV is calculated n .

3. The method for screening potential abnormal batteries according to claim 1, characterized in that: Determine the battery's discharge DC resistance DCR n1 ,include: Under the preset temperature conditions, adjust the battery SOC to 50%; After the battery rest time reaches the first preset time, measure the battery voltage V n3 ; The battery is subjected to mC pulse discharge, and after reaching the second preset time, the battery voltage V is measured. n4 ; According to the formula DCR n1 =(V n3 -V n4 ) / mC, the discharge DC internal resistance DCR is calculated n1 .

4. The method for screening potential abnormal batteries according to claim 3, characterized in that: Determine the battery charging DC internal resistance DCR n2 ,include: At the measured battery voltage V n4 After that, the battery is left to stand for a third preset time, and the battery voltage V is measured. n5 ; The battery is charged by mC pulse and after reaching the fourth preset time, the battery voltage V is measured. n6 ; According to the formula DCR n2 =(V n6 -V n5 ) / mC, and calculate the charging DC internal resistance DCR n2 .

5. The method for screening potential abnormal batteries according to claim 2, characterized in that: The preset time ΔT≥36 hours.

6. The method for screening potential abnormal batteries according to claim 4, characterized in that: The first preset time is 0.5 hours, the second preset time is 30 seconds, the third preset time is 5 minutes, and the fourth preset time is 30 seconds.

7. The method for screening potential abnormal batteries according to claim 1, characterized in that: Measuring the voltages of the first to m-th groups of batteries at preset time intervals includes: The voltage of the first to mth groups of batteries is measured once every 24 hours, and each group of batteries is measured no less than 10 times in total.

8. A device for screening potentially abnormal batteries, characterized in that: include: The performance parameter acquisition module is used to determine the performance parameters of the battery to be tested, wherein the performance parameters include: battery capacity C n , the battery is short-circuited with a large resistor R EXT The self-discharge rate ΔV n , the battery discharge DC internal resistance DCR n1 , the battery charging DC internal resistance DCR n2 and the battery's AC internal resistance ACR n ; A judging module, used to judge whether the battery is qualified according to the performance parameters of the battery to be tested determined by the performance parameter acquisition module; The performance parameter acquisition module is further used to: select m groups of batteries and number the battery groups in sequence from 1 to m, where m ≥ 4; select m-1 kilo-ohm resistors and number the resistors in descending order from large to small resistance values ​​as R1 to R m-1 ; When each battery group is fully charged, the batteries in each group are left to stand until the voltage is balanced; The first group of batteries has no short-circuit resistor, and the second to mth groups of batteries are short-circuited R1 to R m-1 resistance; According to the preset time interval, the voltage of the first group to the mth group of batteries is measured to obtain the voltage V1 to V m , determining the voltage drop of each group of batteries according to the voltage of each group of batteries obtained each time and the preset time interval; Determine R1~R m-1 R k The super large resistor R EXT , where R is short-circuited k-1 The difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is less than the first preset value, short-circuit R k The difference between the voltage drop of the battery group and the voltage drop of the first battery group is greater than a second preset value, and the second preset value is greater than the first preset value.

9. The device for screening potential abnormal batteries according to claim 8, characterized in that: The performance parameter acquisition module includes a voltage measurement module, a calculation module and a super large resistor R EXT , wherein the super large resistor R EXT It is used to short-circuit with the battery. The voltage measurement module is used to measure the battery voltage. The calculation module is used to calculate the self-discharge rate ΔV n .

10. The device for screening potential abnormal batteries according to claim 9, characterized in that: The performance parameter acquisition module also includes: A battery SOC adjustment module, used to adjust the battery SOC; The mC pulse charge and discharge module is used to perform mC pulse charge and discharge on the battery.

11. A battery, characterized in that: Whether there is a potential abnormality is determined by using the method for screening potential abnormal batteries as described in any one of claims 1-7, or a device for screening potential abnormal batteries as described in any one of claims 8-10 is provided.

12. A vehicle, characterized in that: A device for screening potentially abnormal batteries as described in any one of claims 8 to 10, or a battery as described in claim 11 is provided.

Images