CN110404827B - Battery screening method and device and storage medium - Google Patents
Battery screening method and device and storage medium Download PDFInfo
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- CN110404827B CN110404827B CN201910640289.6A CN201910640289A CN110404827B CN 110404827 B CN110404827 B CN 110404827B CN 201910640289 A CN201910640289 A CN 201910640289A CN 110404827 B CN110404827 B CN 110404827B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The embodiment of the application discloses a battery screening method, a battery screening device and a storage medium, wherein when a battery to be screened after liquid injection is finished is charged to a target voltage, the charging is stopped; when the charging is stopped for a first time length, determining a first voltage of the battery to be screened, and continuously charging the battery to be screened for a second time length by using a preset charging current; when the second time length is up, determining a second voltage of the battery to be screened; determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and a preset charging current; and under the condition that the first internal resistance is in a first preset range, determining the battery to be screened as a qualified battery.
Description
Technical Field
The embodiment of the application relates to the technical field of battery charging, in particular to a battery screening method and device and a storage medium.
Background
Lithium ion batteries are widely used in electronic devices because of their high energy, high power, long service life, and large working range.
At present, after the lithium ion battery is formed, the voltage of the battery can be manually measured, so that unqualified batteries can be screened out. Specifically, for the battery with the end of liquid injection, the voltage of the battery can be tested whether to reach a target value, for example, 4.1V, after the battery is formed into a small current for 8 hours. In addition, the time required for the battery to reach the cut-off voltage, for example, 4.2V, can be tested to determine whether the battery is within the preset range. Of course, after the battery is formed, the discharge capacity of the battery is measured several times to determine whether the battery is acceptable, and a battery whose capacity has not reached a certain value may be determined as unacceptable.
However, all the currently adopted battery screening methods require manual testing, the consumed time is too long, the process is complex, and the screening efficiency is low.
Disclosure of Invention
The embodiment of the application provides a battery screening method and device and a storage medium, and the battery screening method and device and the storage medium are used for realizing the screening of batteries in the formation process of the batteries based on the change condition of the internal resistance of the batteries, so that the screening efficiency is improved.
The technical scheme of the embodiment of the application is realized as follows:
the embodiment of the application provides a battery screening method, which comprises the following steps:
when the battery to be screened after liquid injection is finished is charged to a target voltage, stopping charging;
when the charging is stopped for a first time length, determining a first voltage of the battery to be screened, and continuously charging the battery to be screened for a second time length by using a preset charging current;
when the second time length is up, determining a second voltage of the battery to be screened;
determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and a preset charging current;
and under the condition that the first internal resistance is within a first preset range, determining the battery to be screened as a qualified battery.
The embodiment of the application provides a battery sieving mechanism, includes:
the current module is used for stopping charging when the battery to be screened after liquid injection is finished is charged to a target voltage;
the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a first voltage of a battery to be screened when the charging is stopped for a first time length;
the current module is further used for continuously charging the battery to be screened for a second time period by using the preset charging current after the charging is stopped for the first time period;
the determining module is further used for determining a second voltage of the battery to be screened when the second duration is reached; determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and a preset charging current; and under the condition that the first internal resistance is within a first preset range, determining the battery to be screened as a qualified battery. .
The embodiment of the application provides a battery screening device, which comprises a processor, a memory and a communication bus;
the communication bus is used for realizing communication connection between the processor and the memory;
and the processor is used for executing the battery screening program stored in the memory so as to realize the battery screening method.
An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the battery screening method described above.
The embodiment of the application provides a battery screening method, which comprises the steps of charging a battery to be screened after liquid injection to a target voltage, and stopping charging; when the charging is stopped for a first time length, determining a first voltage of the battery to be screened, and continuously charging the battery to be screened for a second time length by using a preset charging current; when the second time length is up, determining a second voltage of the battery to be screened; determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and a preset charging current; and under the condition that the first internal resistance is within a first preset range, determining the battery to be screened as a qualified battery. Compared with the conventional battery screening scheme that the battery is repeatedly charged and discharged to determine the discharge capacity of the battery and then is screened according to the discharge capacity, the technical scheme provided by the embodiment of the application can realize screening of the battery by determining the internal resistance of the battery in the formation process of the battery, so that the screening efficiency is improved.
Drawings
Fig. 1 is a first schematic flow chart of a battery screening method according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating charging of an exemplary battery to be screened according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart illustrating a battery screening method according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a battery screening apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a battery screening apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for the convenience of description, only the parts related to the related applications are shown in the drawings.
Example one
The embodiment of the application provides a battery screening method. Fig. 1 is a first schematic flow chart of a battery screening method according to an embodiment of the present disclosure. As shown in fig. 1, the method mainly comprises the following steps:
and S101, stopping charging when the battery to be screened after liquid injection is finished is charged to a target voltage.
In the embodiment of the application, the battery screening device can charge the battery to be screened firstly, and stops charging when the battery to be screened reaches the target voltage.
In the embodiments of the present application, the battery to be screened is a battery that completes electrolyte injection, that is, a battery after liquid injection is completed. For the battery after the liquid injection is finished, the formation is needed to activate the battery, so that the battery can be normally used. The battery screening device actually screens the batteries in the formation process.
It should be noted that, in the embodiment of the present application, a specific charging current may be set in the battery screening apparatus according to an actual requirement, and the battery screening apparatus may charge the battery to be screened by using the specific charging current, until the battery to be screened reaches the target voltage, the charging is stopped. The current for charging the battery to be screened to the target voltage by the battery screening apparatus may generally be a small current, and the specific current magnitude is not limited in the embodiments of the present application.
Illustratively, in the embodiments of the present application, the target voltage is 3.5V. The battery screening device can charge the battery to be screened by using the current of 60mA until the battery to be screened reaches 3.5V,
s102, when the charging is stopped for the first time length, determining a first voltage of the battery to be screened, and continuously charging the battery to be screened for a second time length by using a preset charging current.
In the embodiment of the application, after the battery screening device charges the battery to be screened to the target voltage and stops charging, the battery screening device determines the first voltage of the battery to be screened when the charging is stopped for the first time period, and continues to charge the battery to be screened for the second time period by using the preset charging current.
It should be noted that, in the embodiment of the present application, the battery screening apparatus stores therein the first time period, the second time period, and the preset charging current. The specific first time length, the first time length and the preset charging current can be preset according to actual requirements, and the embodiment of the application is not limited.
Specifically, in the embodiment of the present application, the target voltage is V0, the preset charging current is I, and the first time duration is T1. The battery screening device stops charging when the battery to be screened is charged to the voltage V0, then measures the first voltage of the battery to be screened when the charging is stopped for T1 time period, and continues to charge the battery to be screened for T1 time period by using the current I.
Illustratively, in the embodiment of the present application, the target voltage is 3.5V, the first time period is 1h, and the preset charging current is 60 mA. When the battery screening device charges the batteries to be screened to 3.5V, the charging is stopped. And then, when the battery to be screened stops charging for 1h, the first voltage of the battery to be screened is measured to be 3.48V by the battery screening battery, and the battery to be screened is continuously charged for 1h by using the current of 60 mA.
And S103, determining a second voltage of the battery to be screened when the second time length is reached.
In the embodiment of the application, after the battery screening device continues to charge the battery to be screened for the second time period by using the preset charging current, when the second time period is reached, the battery screening device determines the second voltage of the battery to be screened.
It should be noted that, in the embodiment of the present application, the second time period may be set in the battery screening apparatus according to actual requirements. The specific second time length is not limited in the embodiments of the present application.
Specifically, in the embodiment of the present application, the preset charging current is I, the first time period is T1, and the second time period is T2. The battery screening device measures a first voltage of the battery to be screened when the battery screening device stops charging for T1 time, and charges the battery to be screened for T2 time by using the current I. And measuring a second voltage of the battery to be screened when the time period T2 is reached.
Illustratively, in the embodiment of the present application, the preset charging current is 90mA, the first time period is 1h, and the second time period is 4 s. When the battery screening device stops charging for 1h, the first voltage of the battery to be screened is measured, namely the battery to be screened can be continuously charged for 4s by using 90mA current, and the second voltage of the battery to be screened is measured when the charging time reaches 4 s.
Fig. 2 is a schematic diagram illustrating charging of an exemplary battery to be screened according to an embodiment of the present disclosure. As shown in fig. 2, the battery screening apparatus first charges the battery to be screened to a target voltage of 3.5V with a current of 60mA, then stops charging, measures the voltage of the battery to be screened to be 3.48V when the charging is stopped for 1h, and continues to charge the battery to be screened for 4s with a preset charging current of 90 mA. And when the time length of 4s is up, the battery screening device measures that the second voltage of the battery to be screened is 3.84V.
And S104, determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and the preset charging current.
In an embodiment of the application, after the battery screening device obtains the first voltage and the second voltage, the battery screening device may determine the first internal resistance of the battery to be screened in combination with the preset charging current.
Specifically, in the embodiment of the present application, the battery screening apparatus may determine the first internal resistance of the battery to be screened according to the following formula (1) according to the first voltage, the second voltage and the preset charging current:
R1＝(V2-V1)/I (1)
wherein, R1 is the first internal resistance, V1 is the first voltage, V2 is the second voltage, and I2 is the predetermined charging current.
It should be noted that, in the embodiment of the present application, the battery screening apparatus charges the battery to be screened for the second time period with the preset charging current, where the preset charging current is direct current, and the first internal resistance of the battery to be screened is actually the direct current impedance of the battery to be screened.
Specifically, in the embodiment of the present application, when the battery screening apparatus charges the battery to be screened to the target voltage V0, the charging is stopped. Then, when the charging is stopped for the first time period T1, the first voltage of the battery to be screened is measured to be V1, and the battery to be screened is continuously charged for a second time period T2 by using the preset charging current I. When the second time period T2 is reached, the battery screening device measures a second voltage V2 of the battery to be screened. Therefore, the battery sorting apparatus calculates the first internal resistance of the battery to be sorted as R1 ═ V2-V1)/I2.
And S105, determining the battery to be screened as a qualified battery under the condition that the first internal resistance is within a first preset range.
In the embodiment of the application, after the battery screening device determines the first internal resistance of the battery to be screened, the battery screening device may determine the battery to be screened as a qualified battery under the condition that the first internal resistance is within a first preset range.
It is understood that, in the embodiment of the present application, in the case where the first internal resistance exceeds the first preset range, the battery screening apparatus may determine the battery to be screened as the defective battery.
Specifically, in the embodiment of the present application, the first preset range is [ a1, a2], and the first internal resistance is R1. In the case where R1 is within [ a1, a2], the battery sorting apparatus determines the battery to be sorted as a qualified battery. In the case where R1 exceeds [ a1, a2], the battery sorting apparatus determines the battery to be sorted as a defective battery.
Illustratively, in the embodiment of the present application, the first preset range is [1.8m Ω, 2.2m Ω ], and the first internal resistance of the battery to be screened is 2.1m Ω. Since 2.1m Ω is within the first preset range, the battery screening apparatus determines the battery to be screened as a qualified battery.
Illustratively, in the embodiment of the present application, the first preset range is [3.6m Ω, 4.4m Ω ], and the first internal resistance of the battery to be screened is 8m Ω. Since 8m Ω is out of the first preset range, the battery screening apparatus determines the battery to be screened as a defective battery.
It should be noted that, in the embodiment of the present application, the battery screening apparatus determines the first preset range by using at least one sample battery after the liquid injection is finished. Wherein, the sample battery and the battery to be screened after at least one liquid injection are the same batch of batteries.
It can be understood that, because there is a certain difference in the manufacturing process or the battery parameters between batteries of different batches, in the embodiment of the present application, the sample battery belonging to the same batch as the battery to be screened, that is, the sample battery and the battery parameter of the battery to be screened, may be selected to be consistent and more comparable.
Specifically, in the embodiment of the present application, the determining, by the battery screening apparatus, the first preset range mainly includes: determining at least one charging internal resistance corresponding to at least one sample battery after liquid injection is finished by using the target voltage, the preset charging current, the first time length and the second time length; a first preset range is determined based on at least one charging internal resistance.
In the embodiment of the present application, the battery screening apparatus may first charge each sample battery of the at least one sample battery after the liquid injection to the target voltage, and then stop charging. The specific magnitude of the charging current is not limited in the embodiments of the present application.
It should be noted that, in the embodiment of the present application, the number of the sample batteries may be set according to actual requirements. The number of sample cells is not limited in the embodiments of the present application.
It should be noted that, in the embodiment of the present application, the battery screening apparatus determines, for at least one sample battery after liquid injection is completed, a corresponding one of the internal charging resistances by using the target voltage, the preset charging current, the first time duration, and the second time duration. The specific method for determining the charging internal resistance is the same as the steps S101 to S104, and is not described herein again.
Specifically, in an embodiment of the present application, the battery screening apparatus determines the first preset range based on at least one charging internal resistance, including: determining the average value of at least one internal resistance in a preset internal resistance range in at least one charging internal resistance to obtain a first average value; and determining a first preset range based on the preset floating parameter and the first mean value.
It should be noted that, in the embodiment of the present application, a preset internal resistance range may be set in the battery screening apparatus according to an actual situation, where the preset internal resistance range is a larger range for screening internal resistance. Because a relatively extreme internal resistance value may exist in at least one first charging internal resistance, and actually, the corresponding sample battery is not qualified, in order to ensure the accuracy of the first preset range and the accuracy of subsequently screening the battery by using the first preset range, the battery screening device discards at least one internal resistance exceeding the preset internal resistance range, namely, an internal resistance with an excessively large or excessively small internal resistance, from at least one first charging internal resistance, and only selects an internal resistance within the preset internal resistance range, namely, an internal resistance with a relatively proper internal resistance, to perform the subsequent first average value operation.
For example, in the embodiment of the present application, the total internal resistance of 50 samples is included, and the battery screening apparatus may determine 50 internal charging resistances corresponding to the internal resistances of 50 samples. The preset internal resistance range is [ X1, X2 ]. The battery screening device can select each internal resistance within [ X1, X2] of the 50 first sample internal resistances, and determine the average value of the internal resistances to obtain a first average value Rx 1.
It should be noted that, in the embodiment of the present application, a preset floating parameter may be set in the battery screening apparatus according to an actual screening requirement. The specific preset floating parameters are not limited in the embodiments of the present application.
Illustratively, in the embodiments of the present application, the preset float parameter is 10%, and the first mean value is Rx1, so the first preset range is [ (1-10%) Rx1, (1+ 10%) Rx1 ].
It should be noted that, in the embodiment of the present application, after the battery screening apparatus performs the above step S105, after the battery to be screened is determined as the qualified battery, the battery screening apparatus may also perform the screening again. Fig. 2 is a schematic flow chart of a battery screening method according to an embodiment of the present disclosure. As shown in fig. 3, after step S105, the following steps may be further included:
and S301, stopping discharging when the battery to be screened is discharged to a preset voltage.
In the embodiment of the application, the battery screening device can also discharge the battery to be screened to the preset voltage, and stop discharging when the preset voltage is reached.
It should be noted that, in the embodiment of the present application, the battery screening apparatus may discharge the battery to be screened with a small current. The current magnitude and the preset voltage adopted when the battery to be screened is discharged to the preset voltage can be preset according to actual requirements, and the embodiment of the application is not limited.
Illustratively, in the embodiment of the present application, the current for discharging to the preset voltage is 300mA, and the preset voltage is 4V. The battery screening device can discharge the battery to be screened to 4V at a current of 300mA, and when the current reaches 4V, the discharge is stopped.
S302, when the discharging of the battery to be screened is stopped for the third time length, determining a third voltage of the battery to be screened, and continuously discharging the battery to be screened for a fourth time length by using a preset discharging current.
In the embodiment of the application, when the battery screening device stops discharging the battery to be screened for the third time length, the third voltage of the battery to be screened is determined, and the battery to be screened continues to discharge for the fourth time length by using the preset discharge current.
It should be noted that, in the embodiment of the present application, the third time period and the preset discharge current may be preset according to an actual requirement, and the specific third time period and the preset discharge current are not limited in the embodiment of the present application.
And S303, determining a fourth voltage of the battery to be screened when the fourth time length is reached.
In an embodiment of the application, the battery screening apparatus determines a fourth voltage of the battery to be screened when the fourth time length is reached.
Illustratively, in the embodiment of the present application, the preset discharge current is 300mA, and the fourth time period is 3 s. The battery screening device can discharge the battery to be screened for 3s at the current of 300mA, and when the time length of 3s is reached, the fourth voltage of the battery to be screened is determined.
In the embodiment of the present application, the fourth time period may be the same as or different from the second time period, and the embodiment of the present application is not limited.
And S304, determining a second internal resistance of the battery to be screened according to the third voltage, the fourth voltage and the preset discharge current.
In the embodiment of the application, after the battery screening device obtains the third voltage and the fourth voltage of the battery to be screened, the battery screening device may determine the second internal resistance of the battery to be screened in combination with the preset discharge current.
It should be noted that, in the embodiment of the present application, the first internal resistance is actually the internal resistance of the battery to be screened during the charging process, and the second internal resistance is actually the internal resistance of the battery to be screened during the discharging process.
It should be noted that, in the embodiment of the present application, the battery screening apparatus may determine the second internal resistance of the battery to be screened by using the above formula (1) according to the third voltage, the fourth voltage and the preset discharging current, specifically, the first voltage of the formula (1) may be replaced by the fourth voltage, the second voltage may be replaced by the third voltage, and the preset charging current may be replaced by the preset discharging current, which is not described herein again.
S305, under the condition that the second internal resistance exceeds a second preset range, the battery to be screened is determined as the unqualified battery again.
In the embodiment of the application, after the battery screening device determines the second internal resistance, the battery screening device determines the battery to be screened as the unqualified battery again when the second internal resistance exceeds the second preset range.
It can be understood that, in the embodiment of the present application, in the case that the second internal resistance is within the second preset range, the battery screening apparatus further verifies that the result of determining the battery to be screened as the qualified battery last time is correct, so as to ensure the accuracy of battery screening.
It should be noted that, in the embodiment of the present application, the battery screening apparatus may further determine the second preset range based on at least one sample battery after formation is finished, and mainly includes the following steps: determining at least one discharge internal resistance corresponding to at least one formed sample battery by using the preset voltage, the preset discharge current, the third time length and the fourth time length; a second preset range is determined based on the at least one internal discharge resistance.
It should be noted that, in the embodiment of the present application, the battery screening apparatus determines, for at least one sample battery after formation is finished, a corresponding discharge internal resistance by using a preset voltage, a preset discharge current, a third time duration, and a fourth time duration. The specific method for determining the internal discharge resistance is the same as the above steps S201 to S204, and is not described herein again.
Specifically, in an embodiment of the present application, the battery screening apparatus determines the second preset range based on at least one internal discharge resistance, including: determining the mean value of at least one internal resistance in the preset internal resistance range in at least one discharging internal resistance to obtain a second mean value; and determining a second preset range based on the preset floating parameter and the second average value.
In the embodiment of the present application, since a relatively extreme internal resistance value may exist in at least one discharging internal resistance, and actually, the corresponding sample battery itself is not qualified, in order to ensure the accuracy of the second preset range and the accuracy of subsequently screening the battery by using the second preset range, the battery screening device discards at least one internal resistance out of the preset internal resistance range, that is, an internal resistance that is too large or too small, from among the at least one discharging internal resistance, and only selects an internal resistance that is within the preset internal resistance range, that is, an internal resistance that is relatively suitable for performing the subsequent second average calculation.
For example, in the embodiment of the present application, a total of 50 internal resistances of the samples are included, and the battery screening apparatus may determine 50 internal resistances of the discharge corresponding to the 50 internal resistances of the samples. The preset internal resistance range is [ X1, X2 ]. The battery screening apparatus may select each internal resistance within [ X1, X2] of the 50 second sample internal resistances, and determine an average value of the internal resistances to obtain a second average value Rx 2.
Illustratively, in the embodiments of the present application, the preset float parameter is 10%, and the second mean value is Rx2, so the second preset range is [ (1-10%) Rx2, (1+ 10%) Rx2 ].
Illustratively, in the embodiment of the present application, for the battery to be screened and 50 finished sample batteries, the battery screening apparatus discharges 50 sample batteries at a current of 300mA respectively until 50 sample batteries reach a preset voltage of 4V respectively, and stops discharging. For each of the 50 sample cells, the cell screening device measures the corresponding voltage 1h after it stops discharging, and 50 voltages are obtained for the first time. Then, for each sample battery in the 50 sample batteries, the battery screening device discharges for 3s by using a preset discharge current of 300mA, measures the corresponding voltage when the time length of 3s reaches, and obtains 50 voltages for the second time. Then, the battery screening device calculates the internal discharge resistance of each sample battery respectively for the first obtained 50 voltages, the second obtained 50 voltages and the 300mA preset discharge current to obtain 50 internal discharge resistances, and determines that the second average value is 6m Ω based on the 50 internal discharge resistances, so that the second preset range is [5.4m Ω,6.6m Ω ] based on the second average value of 6m Ω as a reference and the preset floating parameter of 10%. And determining the corresponding second internal resistance of the battery to be screened in the manner. And under the condition that the second internal resistance is between 5.4m omega and 6.6m omega, the result of the first judgment is correct, namely, the battery to be screened is verified to be a qualified battery again. And under the condition that the second internal resistance exceeds [5.4m omega, 6.6m omega ], the battery screening device re-determines the battery to be screened as the unqualified battery.
In the embodiment of the present application, after the battery screening apparatus executes steps S101 to S104, when it is determined that the battery to be screened is qualified, the battery screening apparatus may repeat the qualified screening. Specifically, after step S105, the following steps may be further included: continuously charging the battery to be screened at least once by using the preset charging current and the second time length; when each charging is completed, determining a real-time internal resistance of the battery to be screened to obtain at least one real-time internal resistance; and under the condition that the number of the real-time internal resistances exceeding the first preset range is larger than a preset threshold value, the battery to be screened is determined as the unqualified battery again. The specific preset threshold is not limited in the embodiments of the present application.
It should be noted that, in the embodiment of the present application, the number of times that the battery screening apparatus continues to charge the battery to be screened may be set according to an actual requirement, and the embodiment of the present application is not limited. The specific charging and measuring process is the same as the step S101, and is not described herein again.
It can be understood that, in the embodiment of the present application, in the case that the battery to be screened is determined to be a qualified battery, the subsequent process of continuing to charge for the repeated test may actually be regarded as verification of the result, so as to ensure that the determination result is more accurate.
The embodiment of the application provides a battery screening method, which is characterized in that when a battery to be screened after liquid injection is finished is charged to a target voltage, the charging is stopped; when the charging is stopped for the first time length, determining a first voltage of the battery to be screened, continuously charging the battery to be screened for a second time length by using a preset charging current, and when the second time length is reached, determining a second voltage of the battery to be screened; determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and a preset charging current; under the condition that the first internal resistance is within a first preset range, determining the battery to be screened as a qualified battery; compared with the conventional battery screening scheme that the battery is repeatedly charged and discharged to determine the discharge capacity of the battery and then is screened according to the discharge capacity, the technical scheme provided by the embodiment of the application can realize screening of the battery by determining the internal resistance of the battery in the formation process of the battery, so that the screening efficiency is improved.
Example two
Fig. 4 is a first schematic structural diagram of a battery screening apparatus according to an embodiment of the present application. As shown in fig. 4, the apparatus includes:
the current module 401 is configured to stop charging when the battery to be screened after liquid injection is finished is charged to a target voltage;
a determining module 402, configured to determine a first voltage of the battery to be screened when charging is stopped for a first time period;
the current module 401 is further configured to continue to charge the battery to be screened for a second time period by using a preset charging current after the charging is stopped for the first time period;
the determining module 402 is further configured to determine a second voltage of the battery to be screened when the second duration is reached; determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and the preset charging current; and under the condition that the first internal resistance is within a first preset range, determining the battery to be screened as a qualified battery.
Optionally, the determining module 402 is further configured to determine at least one charging internal resistance corresponding to at least one sample battery after liquid injection is finished, by using the target voltage, the preset charging current, the first time duration, and the second time duration; determining the first preset range based on the at least one charging internal resistance.
Optionally, the determining module 402 is specifically configured to determine an average value of at least one internal resistance in a preset internal resistance range in the at least one charging internal resistance, so as to obtain a first average value; and determining the first preset range based on a preset floating parameter and the first mean value.
Optionally, the current module 401 is further configured to stop discharging when the battery to be screened is discharged to a preset voltage;
the determining module 402 is further configured to determine a third voltage of the battery to be screened when the discharging is stopped for a third time length;
the current module 401 is further configured to continue to discharge the battery to be screened for a fourth time period by using a preset discharge current after stopping discharging for the third time period;
the determining module 402 is further configured to determine a fourth voltage of the battery to be screened when the fourth time length arrives; determining a second internal resistance of the battery to be screened according to the third voltage, the fourth voltage and the preset discharge current; and under the condition that the second internal resistance exceeds a second preset range, the battery to be screened is determined as an unqualified battery again.
Optionally, the determining module 402 is further configured to determine at least one discharging internal resistance corresponding to at least one finished sample battery by using the preset voltage, the preset discharging current, the third time period, and the fourth time period; determining the second preset range based on the at least one internal discharge resistance.
Optionally, the determining module 402 is specifically configured to determine an average value of at least one internal resistance in a preset internal resistance range in the at least one discharging internal resistance, so as to obtain a second average value; and determining the second preset range based on a preset floating parameter and a second average value.
Optionally, the current module 401 is further configured to continue to charge the battery to be screened at least once by using the preset charging current and the second duration;
the determining module 402 is further configured to determine a real-time internal resistance of the battery to be screened to obtain at least one real-time internal resistance when each charging is completed; and under the condition that the number of the real-time internal resistances exceeding the first preset range is larger than a preset threshold value, the battery to be screened is determined as an unqualified battery again.
Fig. 5 is a schematic structural diagram of a battery screening apparatus according to an embodiment of the present application. As shown in fig. 5, the apparatus includes a processor 501, a memory 501, and a communication bus 503;
the communication bus 503 is used for realizing communication connection between the processor 501 and the memory 502;
the processor 501 is configured to execute the battery screening program stored in the memory 502 to implement the above battery screening method.
The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, and the computer program realizes the battery screening method when being executed by a processor. The computer-readable storage medium may be a volatile Memory (volatile Memory), such as a Random-Access Memory (RAM); or a non-volatile Memory (non-volatile Memory), such as a Read-Only Memory (ROM), a flash Memory (flash Memory), a Hard Disk (Hard Disk Drive, HDD) or a Solid-State Drive (SSD); or may be a respective device, such as a mobile phone, computer, tablet device, personal digital assistant, etc., that includes one or any combination of the above-mentioned memories.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of implementations of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks and/or flowchart block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks in the flowchart and/or block diagram block or blocks.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A method of screening batteries, the method comprising:
when the battery to be screened after liquid injection is finished is charged to a target voltage, stopping charging;
when the charging is stopped for a first time length, determining a first voltage of the battery to be screened, and continuously charging the battery to be screened for a second time length by using a preset charging current;
when the second duration is reached, determining a second voltage of the battery to be screened;
determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and the preset charging current;
under the condition that the first internal resistance is within a first preset range, determining the battery to be screened as a qualified battery;
wherein the method further comprises:
determining at least one charging internal resistance corresponding to at least one sample battery after liquid injection is finished by using the target voltage, the preset charging current, the first time length and the second time length;
determining the first preset range based on the at least one charging internal resistance.
2. The method of claim 1, wherein said determining said first preset range based on said at least one internal charging resistance comprises:
determining the average value of at least one internal resistance in a preset internal resistance range in the at least one charging internal resistance to obtain a first average value;
and determining the first preset range based on a preset floating parameter and the first mean value.
3. The method according to claim 1, wherein after determining the battery to be screened as a qualified battery in the case that the first internal resistance is within a first preset range, the method further comprises:
stopping discharging when the battery to be screened is discharged to a preset voltage;
when the discharging of the battery to be screened is stopped for a third time length, determining a third voltage of the battery to be screened, and continuously discharging the battery to be screened for a fourth time length by using a preset discharging current;
when the fourth time length is reached, determining a fourth voltage of the battery to be screened;
determining a second internal resistance of the battery to be screened according to the third voltage, the fourth voltage and the preset discharge current;
and under the condition that the second internal resistance exceeds a second preset range, the battery to be screened is determined as an unqualified battery again.
4. The method of claim 3, further comprising:
determining at least one discharge internal resistance corresponding to at least one finished sample battery by using the preset voltage, the preset discharge current, the third time and the fourth time;
determining the second preset range based on the at least one internal discharge resistance.
5. The method of claim 4, wherein said determining said second preset range based on said at least one internal discharge resistance comprises:
determining the average value of at least one internal resistance in the preset internal resistance range in the at least one discharging internal resistance to obtain a second average value;
and determining the second preset range based on a preset floating parameter and the second average value.
6. The method according to claim 1, wherein after determining the battery to be screened as a qualified battery in the case that the first internal resistance is within the first preset range, the method further comprises:
continuously charging the battery to be screened at least once by using the preset charging current and the second time length;
when each charging is completed, determining a real-time internal resistance of the battery to be screened to obtain at least one real-time internal resistance;
and under the condition that the number of the real-time internal resistances exceeding the first preset range is larger than a preset threshold value, the battery to be screened is determined as an unqualified battery again.
7. A battery screening apparatus, the apparatus comprising:
the current module is used for stopping charging when the battery to be screened after liquid injection is finished is charged to a target voltage;
the determining module is used for determining a first voltage of the battery to be screened when the charging is stopped for a first time length;
the current module is further used for continuing to charge the battery to be screened for a second time period by using a preset charging current after the charging is stopped for the first time period;
the determining module is further configured to determine a second voltage of the battery to be screened when the second duration is reached; determining a first internal resistance of the battery to be screened according to the first voltage, the second voltage and the preset charging current; under the condition that the first internal resistance is within a first preset range, determining the battery to be screened as a qualified battery;
the determining module is further configured to determine at least one charging internal resistance corresponding to at least one sample battery after liquid injection is finished by using the target voltage, the preset charging current, the first time length and the second time length; determining the first preset range based on the at least one charging internal resistance.
8. A battery screening apparatus, the apparatus comprising a processor, a memory and a communication bus;
the communication bus is used for realizing communication connection between the processor and the memory;
the processor configured to execute the battery filter stored in the memory to implement the method of any one of claims 1 to 6.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-6.
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| CN111929598A (en) * | 2020-09-16 | 2020-11-13 | 深圳奥特迅电力设备股份有限公司 | Storage battery internal resistance online measurement method and device |
| CN113078703B (en) * | 2021-03-08 | 2023-04-14 | 深圳市沛城智能控制技术有限公司 | Charging device and charging method |
| CN113219355B (en) * | 2021-03-29 | 2022-04-08 | 安徽江淮汽车集团股份有限公司 | Battery type selection method, device, equipment and storage medium |
| CN114859246B (en) * | 2022-07-07 | 2022-09-09 | 江苏中兴派能电池有限公司 | Soft package battery detection method and device, computer equipment and storage medium |
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