CN114441966A - Method and device for screening potential abnormal battery, battery and vehicle - Google Patents

Method and device for screening potential abnormal battery, battery and vehicle Download PDF

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Publication number
CN114441966A
CN114441966A CN202210072871.9A CN202210072871A CN114441966A CN 114441966 A CN114441966 A CN 114441966A CN 202210072871 A CN202210072871 A CN 202210072871A CN 114441966 A CN114441966 A CN 114441966A
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battery
voltage
batteries
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陈金峰
李享
叶正民
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Sany Automobile Manufacturing Co Ltd
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Sany Automobile Manufacturing Co Ltd
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    • 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]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • 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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • 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]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables

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Abstract

The invention provides a method and a device for screening potential abnormal batteries, a battery and a vehicle, and the method comprises the following steps: determining performance parameters of a battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn(ii) a And judging whether the battery is qualified or not according to the determined performance parameters. The method, the device, the battery and the vehicle for screening the potential abnormal battery can avoid the problem of screen leakage and reduce the risk of the battery at an application end.

Description

Method and device for screening potential abnormal battery, battery and vehicle
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a device for screening a potential abnormal battery, a battery and a vehicle.
Background
In the prior art, in order to screen out a battery with potential abnormality in advance, a battery manufacturer generally develops a process method for screening the self-discharge performance of the battery to improve the consistency and safety of subsequent use of the battery.
However, the method for screening the self-discharge performance of the battery in the prior art still has a high screen leakage rate, so that the quality problems of abnormal consistency, abnormal self-discharge and the like of the battery at the application end of the battery are caused.
Disclosure of Invention
The invention provides a method and a device for screening potential abnormal batteries, a battery and a vehicle, which can avoid the problem of screen leakage and reduce the risk of the battery at an application end.
A first aspect of the present invention provides a method of screening for potentially abnormal batteries, comprising the steps of:
determining performance parameters of a battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And judging whether the battery is qualified or not according to the determined performance parameters.
According to the method for screening the potential abnormal battery provided by the invention, the battery is determined to be in short circuit with the super-large resistance REXTSelf discharge rate of time Δ VnThe method comprises the following steps:
under the condition of preset temperature, standing the battery in a full-charge state until the voltage is balanced, and externally connecting a super resistor R to the batteryEXTShort-circuit, measuring voltage Vn1；
After the battery standing time reaches the preset time delta T, measuring the voltage Vn2；
According to the formula Δ Vn＝(Vn1-Vn2) Calculated from the discharge rate Δ V,/Δ Tn。
According to the method for screening the potential abnormal battery provided by the invention, the discharging direct current internal resistance DCR of the battery is determinedn1The method comprises the following steps:
under the condition of a preset temperature, adjusting the SOC of the battery to 50%;
after the battery standing time reaches a first preset time, measuring the voltage V of the batteryn3；
mC pulse discharging the battery, and measuring the voltage V of the battery after reaching the second preset timen4；
According to the formula DCRn1＝(Vn3-Vn4) the/mC is calculated to obtainDC internal resistance DCR dischargesn1。
According to the method for screening the potential abnormal battery provided by the invention, the charging direct current internal resistance DCR of the battery is determinedn2The method comprises the following steps:
at the measured battery voltage Vn4Then, standing the battery for a third preset time, and measuring the voltage V of the batteryn5；
Charging the battery with mC pulse, and measuring the voltage V of the battery after the fourth preset timen6；
According to the formula DCRn2＝(Vn6-Vn5) The charging direct current internal resistance DCR is obtained by calculation of the/mCn2。
According to the method for screening the potential abnormal battery provided by the invention, the super-large resistance R is determinedEXTThe method comprises the following steps:
selecting m groups of batteries, and numbering the battery groups in sequence to be 1-m, wherein m is more than or equal to 4; selecting m-1 kiloohm-level resistors, and numbering the resistors as R according to the sequence of the resistance values from large to small1～Rm-1；
Under the full-charge state of each group of batteries, standing each group of batteries until the voltage is balanced;
the first group of batteries has no short-circuit resistance, and the second group to the mth group of batteries respectively have short-circuit R in one-to-one correspondence1～Rm-1A resistance;
measuring the voltage of the first group to the m group of batteries according to a preset time interval to obtain the voltage V of the first group to the m group of batteries1～VmDetermining 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;
determination of R1～Rm-1R in (1)kIs the super resistance REXTWherein, short circuit Rk-1The difference value between the voltage drop of the battery pack and the voltage drop of the first battery pack is smaller than a first preset value, and the short circuit R is formedkThe difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is larger than a second preset value, and the second preset value is larger than the first preset value.
According to the method for screening the potential abnormal batteries, provided by the invention, the preset time delta T is more than or equal to 36 hours.
According to the method for screening the potential abnormal batteries, the first preset time is 0.5 hour, the second preset time is 30 seconds, the third preset time is 5 minutes, and the fourth preset time is 30 seconds.
According to the method for screening the potential abnormal batteries, the step of measuring the voltages of the batteries from the first group to the mth group according to the preset time interval comprises the following steps:
the voltages of the first to mth groups of cells were measured every 24 hours, and each group of cells was measured not less than 10 times in total.
A second aspect of the present invention provides an apparatus for screening a potentially abnormal battery, comprising:
the performance parameter acquiring module is used for determining performance parameters of the battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And the judging module is used for judging whether the battery is qualified or not according to the performance parameters of the battery to be tested, which are determined by the performance parameter acquiring module.
According to the device for screening the potential abnormal batteries, provided by the invention, the performance parameter acquisition module comprises a voltage measurement module, a calculation module and a super resistor REXTWherein the super resistance REXTThe voltage measuring module is used for measuring the voltage of the battery; the calculation module is used for calculating self-discharge rate delta Vn。
According to the apparatus for screening a potentially abnormal battery provided by the present invention, the performance parameter acquiring module further includes:
the battery SOC adjusting module is used for adjusting the SOC of the battery;
and the mC pulse charging and discharging module is used for carrying out mC pulse charging and discharging on the battery.
A third aspect of the present invention provides a battery, which is determined whether a potential abnormality exists by the method for screening a potentially abnormal battery as described in any one of the above, or is provided with a device for screening a potentially abnormal battery as described in any one of the above.
A fourth aspect of the invention provides a vehicle provided with the apparatus for screening a potentially abnormal battery as described in any one of the above, or the battery as described above.
Has the advantages that:
the invention provides a method for screening a potential abnormal battery, which comprises the following steps:
determining performance parameters of a battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And judging whether the battery is qualified or not according to the determined performance parameters.
Therefore, the screening method provided by the invention comprehensively screens the potential abnormal batteries through the battery capacity, the self-discharge test, the charging and discharging direct-current resistance and the alternating-current internal resistance. The probability that the potential quality abnormal battery is leaked is reduced, and the risk of an application end is further reduced.
Secondly, in a further technical scheme provided by the invention, the battery is determined to be in short circuit with an ultra-large resistance REXTSelf discharge rate of time Δ VnThe method comprises the following steps:
under the condition of preset temperature, standing the battery in a full-charge state until the voltage is balanced, and externally connecting a super resistor R to the batteryEXTShort-circuit, measuring voltage Vn1；
After the battery standing time reaches the preset time delta T, measuring the voltage Vn2；
According to the formula Δ Vn＝(Vn1-Vn2) Calculated from the discharge rate Δ V,/Δ Tn。
By shorting the super resistor REXTTest the self-discharge rate Δ VnCan effectively test the batteryPerformance in terms of discharge.
Thirdly, in the further technical scheme provided by the invention, the super-large resistance R is determinedEXTThe method comprises the following steps:
selecting m groups of batteries, and numbering the battery groups in sequence to be 1-m, wherein m is more than or equal to 4; selecting m-1 kiloohm-level resistors, and numbering the resistors as R according to the sequence of the resistance values from large to small1～Rm-1；
Under the full-charge state of each group of batteries, standing each group of batteries until the voltage is balanced;
the first group of batteries has no short-circuit resistance, and the second group to the mth group of batteries respectively have short-circuit R in one-to-one correspondence1～Rm-1A resistance;
measuring the voltage of the first group to the m group of batteries according to a preset time interval to obtain the voltage V of the first group to the m group of batteries1～VmDetermining 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;
determination of R1～Rm-1R in (1)kIs the super resistance REXTWherein, short circuit Rk-1The difference value between the voltage drop of the battery pack and the voltage drop of the first battery pack is smaller than a first preset value, and the short circuit R is formedkThe difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is larger than a second preset value, and the second preset value is larger than the first preset value.
Thus, the method can determine the optimal super-large resistance R adopted in screening the batteriesEXTAnd further ensure the accuracy of screening.
The invention also provides a device for screening the potential abnormal batteries, which comprises:
the performance parameter acquiring module is used for determining performance parameters of the battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And the judging module is used for judging whether the battery is qualified or not according to the performance parameters of the battery to be tested, which are determined by the performance parameter acquiring module.
By the arrangement, the screening device provided by the invention can realize the screening method, and the screening device provided by the invention can comprehensively screen the potential abnormal batteries through the battery capacity, the self-discharge test, the charging and discharging direct current resistance and the alternating current internal resistance, so that the screening leakage probability of the potential quality abnormal batteries is reduced, and the risk of an application end is further reduced. The derivation process of the beneficial effect is substantially similar to the derivation process of the beneficial effect brought by the screening method, and is not repeated here.
The battery and the vehicle provided by the invention can comprehensively screen the potential abnormal battery through battery capacity, self-discharge test, charging and discharging direct current resistance and alternating current internal resistance, so that the probability of screening the potential quality abnormal battery is reduced, and the risk of an application end is further reduced.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a method for screening potentially abnormal batteries according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an embodiment of the present invention for determining the super resistance REXTSchematic representation of the process of (1).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for screening a potentially abnormal battery, which may be applied to screening of a lithium battery in an embodiment of the present invention, is described below with reference to fig. 1 to 2, and includes the steps of:
s11, determining the performance parameters of the battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And S12, judging whether the battery is qualified according to the determined performance parameters.
In the prior art, screening is usually performed only by the three aspects of battery capacity, self-discharge rate and alternating current internal resistance, and the embodiment is performed by improving a self-discharge rate testing method, namely, by short-circuiting an ultra-large resistor REXTMeasuring the self-discharge rate DeltaV of the batterynIn addition, by combining with the test of the charging and discharging direct current internal resistance, the following table shows that the screening method provided by the embodiment obviously reduces the probability of screen leakage of the potential quality abnormal battery, and further reduces the risk of an application end.
Figure BDA0003482923110000071
In a further embodiment, the battery is determined to be shorted to a super-large resistance REXTSelf discharge rate of time Δ VnThe method comprises the following steps:
under the condition of preset temperature, standing the battery in a full-charge state until the voltage is balanced, and externally connecting a super resistor R to the batteryEXTShort-circuit, measuring voltage Vn1(ii) a In some embodiments, the preset temperature condition may be a normal temperature condition;
after the battery standing time reaches the preset time delta T, measuring the voltage Vn2(ii) a In some embodimentsThe battery can be kept still for more than 36 hours under the normal temperature condition;
according to the formula Δ Vn＝(Vn1-Vn2) Calculated from the discharge rate Δ V,/Δ Tn。
With the adoption of the arrangement, the self-discharge rate testing method is optimized, and the batteries with the abnormal conditions can be screened out more accurately through the optimized self-discharge rate testing method.
In a further embodiment, the internal discharge DC resistance DCR of the battery is determinedn1The method comprises the following steps:
under the condition of a preset temperature, adjusting the SOC (residual capacity) of the battery to 50%; in some embodiments, the preset temperature condition may be a normal temperature condition;
after the battery standing time reaches a first preset time, measuring the voltage V of the batteryn3(ii) a In some embodiments, the cell rest time may be 0.5 hours;
mC pulse discharging the battery, and measuring the voltage V of the battery after reaching the second preset timen4(ii) a In some embodiments, the time for which the mC pulse is discharged may be 30 seconds;
according to the formula DCRn1＝(Vn3-Vn4) The discharge direct current internal resistance DCR is obtained by calculation of the/mCn1。
Thus, the present embodiment provides an optimized discharging DC internal resistance DCRn1The method can more accurately test the discharge direct current internal resistance DCRn1And thus, the battery with abnormality can be screened out more accurately.
In a further technical scheme, the charging direct current internal resistance DCR of the battery is determinedn2The method comprises the following steps:
in measuring the battery voltage Vn4Then, standing the battery for a third preset time, and measuring the voltage V of the batteryn5(ii) a In some embodiments, the third preset time may be 5 minutes;
charging the battery with mC pulse, and measuring the voltage V of the battery after the fourth preset timen6(ii) a In some embodiments, the fourth predetermined time may be 30 seconds；
According to the formula DCRn2＝(Vn6-Vn5) The charging direct current internal resistance DCR is obtained by calculation of the/mCn2。
Thus, the present embodiment provides an optimized charging dc internal resistance DCRn1The method can more accurately test the charging direct current internal resistance DCRn1And thus, the battery with abnormality can be screened out more accurately.
In addition, it should be noted that, when testing the self-discharge rate of the battery, it is necessary to use a suitable short super resistor, and in view of this, in a further embodiment, the super resistor R can be selected by the following methodEXTThe method comprises the following steps:
s21, selecting m groups of batteries, and numbering the batteries in sequence to be 1-m, wherein m is more than or equal to 4; selecting m-1 kiloohm-level resistors, and numbering the resistors as R according to the sequence of the resistance values from large to small1～Rm-1(ii) a In some embodiments, batteries with the same batch and good consistency can be selected and divided into 7 groups, and the batteries are numbered 1-7 respectively. Selecting 6 external short-circuit resistors at kilohm level, marking as R1-R6, wherein the resistance is R1 > R2 > R3 > R4 > R5 > R6;
s22, standing each battery set until the voltage is balanced under the full-charge state of each battery set; in some embodiments, each group of batteries can be kept still until the voltage is balanced under normal temperature and full charge state of the batteries;
s23, the 1 st group battery has no short circuit resistance, and the 2 nd to 7 th groups batteries are respectively in short circuit R in one-to-one correspondence1～R6A resistance;
s24, measuring the voltage of the batteries from the 1 st group to the 7 th group according to the preset time interval, and obtaining the voltage V of the batteries from the 1 st group to the 7 th group1～V7Determining the voltage drop of each group of batteries according to the voltage of each group of batteries obtained each time and a preset time interval;
s25, determining R1～R6R in (1)kIs a super-resistance REXTWherein, short circuit Rk-1The difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is less than a first preset value,short circuit RkThe difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is larger than a second preset value, and the second preset value is larger than the first preset value. For example, when the external resistance is greater than R2, the voltage drop of the battery is almost consistent with the voltage drop of the battery without short circuit, which indicates that the short circuit resistance is greater than R2, and the self-discharge of the battery is not influenced; when the short-circuit resistance is less than R2, the self-discharge of the battery is deteriorated, and at the moment, R3 is set as the external short-circuit resistance R in the test processEXT。
Thus, the method provided by this embodiment selects the short-circuit resistor REXTThe self-discharge rate of the battery can be accurately tested, and the abnormal battery can be more accurately screened out.
Further, the measuring the voltage of the batteries of the 1 st to 7 th groups according to the preset time interval includes:
the voltage of 1 to 7 groups of cells was measured every 24 hours, and each group of cells was measured not less than 10 times in total, that is, continuously for 10 days.
In this way, the short-circuit resistance R that can be selected more precisely by this methodEXT。
The embodiment of the invention also provides a device for screening the potential abnormal batteries, which comprises the following components:
the performance parameter acquisition module is used for determining the performance parameters of the battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And the judging module is used for judging whether the battery is qualified or not according to the performance parameters of the battery to be tested, which are determined by the performance parameter acquiring module.
Further, the performance parameter acquisition module comprises a voltage measurement module, a calculation module and a super resistor REXTWherein the super resistance REXTThe voltage measuring module is used for measuring the voltage of the battery; the calculation module is used for calculating and obtaining the self-discharge rate delta Vn。
According to the apparatus for screening a potentially abnormal battery provided by the present invention, the performance parameter obtaining module further includes:
the battery SOC adjusting module is used for adjusting the SOC of the battery;
and the mC pulse charging and discharging module is used for carrying out mC pulse charging and discharging on the battery.
By the arrangement, the screening device provided by the embodiment can realize the screening method, and the screening device provided by the embodiment can comprehensively screen the potential abnormal battery through the battery capacity, the self-discharge test, the charging and discharging direct current resistance and the alternating current internal resistance, so that the probability of screen leakage of the potential quality abnormal battery is reduced, and the risk of an application end is further reduced. The derivation process of the beneficial effect is substantially similar to the derivation process of the beneficial effect brought by the screening method, and is not repeated here.
The battery and the vehicle provided by the embodiment of the invention can comprehensively screen the potential abnormal battery through the battery capacity, the self-discharge test, the charging and discharging direct-current resistance and the alternating-current internal resistance, so that the probability of screen leakage of the potential quality abnormal battery is reduced, and the risk of an application end is further reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (13)

1. A method of screening for potentially abnormal batteries, comprising the steps of:
determining performance parameters of a battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And judging whether the battery is qualified or not according to the determined performance parameters.
2. The method for screening potentially abnormal batteries according to claim 1, wherein it is determined that the battery is shorted at super resistance REXTSelf discharge rate of time Δ VnThe method comprises the following steps:
under the condition of preset temperature, standing the battery in a full-charge state until the voltage is balanced, and externally connecting a super resistor R to the batteryEXTShort-circuit, measuring voltage Vn1；
After the battery standing time reaches the preset time delta T, measuring the voltage Vn2；
According to the formula Δ Vn＝(Vn1-Vn2) Δ T, calculated from the discharge rate Δ Vn。
3. The method for screening a potentially abnormal battery as claimed in claim 1, wherein the discharging internal direct current resistance DCR of the battery is determinedn1The method comprises the following steps:
under the condition of a preset temperature, adjusting the SOC of the battery to 50%;
after the battery standing time reaches a first preset time, measuring the voltage V of the batteryn3；
mC pulse discharging the battery, and measuring the voltage V of the battery after reaching the second preset timen4；
According to the formula DCRn1＝(Vn3-Vn4) The discharge direct current internal resistance DCR is obtained by calculation of the/mCn1。
4. The method for screening potential abnormal batteries according to claim 3, wherein the charging direct current internal resistance DCR of the battery is determinedn2The method comprises the following steps:
at the measured battery voltage Vn4Then, the battery is allowed to stand until the temperature reaches the second temperatureAfter three preset times, measuring the voltage V of the batteryn5；
Charging the battery with mC pulse, and measuring the voltage V of the battery after the fourth preset timen6；
According to the formula DCRn2＝(Vn6-Vn5) The charging direct current internal resistance DCR is obtained by calculation of the/mCn2。
5. The method for screening potentially abnormal batteries according to claim 2, wherein the super resistance R is determinedEXTThe method comprises the following steps:
selecting m groups of batteries, and numbering the battery groups in sequence to be 1-m, wherein m is more than or equal to 4; selecting m-1 kiloohm-level resistors, and numbering the resistors as R according to the sequence of the resistance values from large to small1～Rm-1；
Under the full-charge state of each group of batteries, standing each group of batteries until the voltage is balanced;
the first group of batteries has no short-circuit resistance, and the second group to the mth group of batteries respectively have short-circuit R in one-to-one correspondence1～Rm-1A resistance;
measuring the voltages of the first group to the mth group of batteries according to a preset time interval to obtain the voltages V of the first group to the mth group of batteries1～VmDetermining 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;
determination of R1～Rm-1R in (1)kIs the super resistance REXTWherein, short circuit Rk-1The difference value between the voltage drop of the battery pack and the voltage drop of the first battery pack is smaller than a first preset value, and the short circuit R is formedkThe difference between the voltage drop of the battery pack and the voltage drop of the first battery pack is larger than a second preset value, and the second preset value is larger than the first preset value.
6. The method for screening potential abnormal batteries according to claim 2, wherein the preset time Δ T is not less than 36 hours.
7. The method of screening for potentially abnormal batteries according to claim 4, wherein the first predetermined time is 0.5 hours, the second predetermined time is 30 seconds, the third predetermined time is 5 minutes, and the fourth predetermined time is 30 seconds.
8. The method for screening potentially abnormal batteries according to claim 5, wherein said measuring the voltage of the first to mth groups of batteries at preset time intervals comprises:
the voltages of the first to mth groups of cells were measured every 24 hours, and each group of cells was measured not less than 10 times in total.
9. An apparatus for screening potentially abnormal batteries, comprising:
the performance parameter acquiring module is used for determining performance parameters of the battery to be tested, wherein the performance parameters comprise: battery capacity CnBattery short circuit super large resistance REXTSelf discharge rate of time Δ VnDischarging direct current internal resistance DCR of batteryn1Charging direct current internal resistance DCR of batteryn2And the AC internal resistance ACR of the batteryn；
And the judging module is used for judging whether the battery is qualified or not according to the performance parameters of the battery to be tested, which are determined by the performance parameter acquiring module.
10. The apparatus for screening potentially abnormal batteries according to claim 9, wherein said performance parameter acquisition module comprises a voltage measurement module, a calculation module and a super resistor REXTWherein the super resistance REXTThe voltage measuring module is used for measuring the voltage of the battery; the calculation module is used for calculating self-discharge rate delta Vn。
11. The apparatus for screening potentially abnormal batteries according to claim 10, wherein said performance parameter acquisition module further comprises:
the battery SOC adjusting module is used for adjusting the SOC of the battery;
and the mC pulse charging and discharging module is used for carrying out mC pulse charging and discharging on the battery.
12. A battery, characterized in that whether a potential abnormality exists is judged by the method of screening a potentially abnormal battery according to any one of claims 1 to 8, or an apparatus of screening a potentially abnormal battery according to any one of claims 9 to 11 is provided.
13. A vehicle provided with an apparatus for screening a potentially abnormal battery according to any one of claims 9 to 11, or a battery according to claim 12.
CN202210072871.9A 2022-01-21 2022-01-21 Method and device for screening potential abnormal battery, battery and vehicle Pending CN114441966A (en)

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CN117347887A (en) * 2023-12-04 2024-01-05 宁德时代新能源科技股份有限公司 Method, system and device for testing self-discharge of battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117347887A (en) * 2023-12-04 2024-01-05 宁德时代新能源科技股份有限公司 Method, system and device for testing self-discharge of battery
CN117347887B (en) * 2023-12-04 2024-04-12 宁德时代新能源科技股份有限公司 Method, system and device for testing self-discharge of battery

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