CN112305439B - Battery life testing method and device and readable storage medium - Google Patents
Battery life testing method and device and readable storage medium Download PDFInfo
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- CN112305439B CN112305439B CN201910703417.7A CN201910703417A CN112305439B CN 112305439 B CN112305439 B CN 112305439B CN 201910703417 A CN201910703417 A CN 201910703417A CN 112305439 B CN112305439 B CN 112305439B
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- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
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Abstract
The disclosure relates to a battery life testing method, a battery life testing device and a readable storage medium. The method comprises the following steps: determining a battery capacity value of the battery; if the capacity value of the battery is larger than or equal to the preset capacity value, the current charge state of the battery is the preset charge state, and the standing time of the battery at the first preset temperature reaches the first preset time, controlling the battery to perform N times of charging and discharging operations, wherein each time of charging and discharging operations comprises multiple times of charging operations and multiple times of discharging operations, the multiple times of charging operations are performed based on at least two current specifications, and the multiple times of discharging operations are performed based on at least two current specifications; after controlling the battery to carry out N times of charging and discharging operations, adding 1 to the test frequency record; re-executing the step of determining the battery capacity value of the battery until the battery capacity value is smaller than the preset capacity value; and if the battery capacity value is smaller than the preset capacity value, determining the service life of the battery according to the current value recorded by the test times. Therefore, the battery life test can be accelerated, and the efficiency of the battery life test is improved.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method and an apparatus for testing battery life, and a readable storage medium.
Background
In recent years, with the shortage of non-renewable energy resources and the rising of crude oil price, people have higher and higher requirements for green energy, and the application rate of battery energy which is one of green energy with relatively mature technology is wider and wider at present.
The battery life is an important index for measuring the performance of the battery, and with the rapid development of battery technology, the battery life in the field of electric automobiles reaches 2000 cycles or even more than 2500 cycles. At present, a widely used life test method in the processes of research, development, inspection and model selection of batteries is to perform cycle test under a certain working condition, the test for analyzing the service life of the batteries is relatively single, the test period is long, not only is the resource waste and the cost increased, but also the research and development progress of battery products is slow. Therefore, if information related to the battery life can be obtained in a short time, the development time of related products can be greatly shortened, and the method has great application value in the fields of battery development, model selection and the like.
Disclosure of Invention
The disclosure aims to provide a battery life testing method, a battery life testing device and a readable storage medium, so as to achieve the purposes of accelerating battery life testing and shortening testing period.
A first aspect of the present disclosure provides a method for testing battery life, the method including:
determining a battery capacity value of the battery;
if the battery capacity value is larger than or equal to a preset capacity value, the current charge state of the battery is a preset charge state, and the standing time of the battery at a first preset temperature reaches a first preset time, controlling the battery to perform N times of charging and discharging operations, wherein each time of charging and discharging operations comprises multiple charging operations and multiple discharging operations, the multiple charging operations are performed based on at least two current specifications, the multiple discharging operations are performed based on at least two current specifications, and N is a positive integer;
adding 1 to a test frequency record after controlling the battery to carry out N times of charging and discharging operations, wherein the initial value of the test frequency record is 0;
re-executing the step of determining the battery capacity value of the battery until the battery capacity value is less than the preset capacity value;
and if the battery capacity value is smaller than the preset capacity value, determining the service life of the battery according to the current value recorded by the test times.
Alternatively, each round of charge and discharge operations includes several charge operations and several discharge operations as follows:
charging the battery with a fourth current specification I4 to bring the state of charge of the battery to a second state of charge SOC2, and then discharging the battery with the fourth current specification I4 to bring the state of charge of the battery to a first state of charge SOC1, the preset state of charge being less than the first state of charge SOC1, the first state of charge SOC1 being less than the second state of charge SOC 2;
charging the battery at a third current specification I3 to bring the state of charge of the battery to a third state of charge SOC3, and thereafter discharging the battery at the third current specification I3 to bring the state of charge of the battery to a second state of charge SOC2, the second state of charge SOC2 being less than the third state of charge SOC 3;
charging the battery at a second current specification I2 to bring the state of charge of the battery to a fourth state of charge SOC4, and thereafter discharging the battery at the second current specification I2 to bring the state of charge of the battery to a third state of charge SOC3, the third state of charge SOC3 being less than the fourth state of charge SOC 4;
charging the battery at a first current specification I1 to bring the state of charge of the battery to the fourth state of charge SOC4, followed by discharging the battery at the first current specification I1 to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the fourth current specification I4 to bring the state of charge of the battery to the second state of charge SOC2, followed by discharging the battery at a standard current specification to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the third current specification I3 to bring the state of charge of the battery to the third state of charge SOC3, followed by charging the battery at the standard current specification to bring the state of charge of the battery to the fourth state of charge SOC 4;
and discharging the battery according to the standard current specification so as to enable the state of charge of the battery to be the preset state of charge.
Optionally, the first current specification I1 is smaller than the second current specification I2, the second current specification I2 is smaller than the third current specification I3, the third current specification I3 is smaller than the fourth current specification I4, and the fourth current specification I4 is smaller than the standard current specification.
Optionally, the determining the battery capacity value comprises:
controlling the battery to stand at a second preset temperature for a second preset time, wherein the second preset temperature is lower than the first preset temperature;
charging the battery to a charging cut-off voltage according to a standard current specification, and then charging the battery in a preset small current constant current mode to enable the charge state of the battery to be 100%;
discharging the battery with the standard current specification to determine a battery capacity value of the battery.
Optionally, the preset capacity value is a product of a preset coefficient and a rated capacity value of the battery.
A second aspect of the present disclosure provides a battery life testing apparatus, the apparatus comprising:
the first determination module is used for determining a battery capacity value of the battery;
the control module is used for controlling the battery to carry out N times of charging and discharging operations if the battery capacity value is larger than or equal to a preset capacity value, the current state of charge of the battery is a preset state of charge, and the standing time of the battery at a first preset temperature reaches a first preset time, wherein each time of charging and discharging operations comprises a plurality of times of charging operations and a plurality of times of discharging operations, the plurality of times of charging operations are carried out at least based on two current specifications, the plurality of times of discharging operations are carried out at least based on two current specifications, and N is a positive integer;
the counting module is used for adding 1 to a test frequency record after controlling the battery to carry out N times of charging and discharging operations, wherein the initial value of the test frequency record is 0;
the triggering module is used for triggering the first determining module to execute the step of determining the battery capacity value of the battery again until the battery capacity value is smaller than the preset capacity value;
and the second determining module is used for determining the service life of the battery according to the current value recorded by the test times if the battery capacity value is smaller than the preset capacity value.
Optionally, the control module is further configured to:
charging the battery with a fourth current specification I4 to bring the state of charge of the battery to a second state of charge SOC2, and then discharging the battery with the fourth current specification I4 to bring the state of charge of the battery to a first state of charge SOC1, the preset state of charge being less than the first state of charge SOC1, the first state of charge SOC1 being less than the second state of charge SOC 2;
charging the battery at a third current specification I3 to bring the state of charge of the battery to a third state of charge SOC3, and thereafter discharging the battery at the third current specification I3 to bring the state of charge of the battery to a second state of charge SOC2, the second state of charge SOC2 being less than the third state of charge SOC 3;
charging the battery at a second current specification I2 to bring the state of charge of the battery to a fourth state of charge SOC4, and thereafter discharging the battery at the second current specification I2 to bring the state of charge of the battery to a third state of charge SOC3, the third state of charge SOC3 being less than the fourth state of charge SOC 4;
charging the battery at a first current specification I1 to bring the state of charge of the battery to the fourth state of charge SOC4, followed by discharging the battery at the first current specification I1 to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the fourth current specification I4 to bring the state of charge of the battery to the second state of charge SOC2, followed by discharging the battery at a standard current specification to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the third current specification I3 to bring the state of charge of the battery to the third state of charge SOC3, followed by charging the battery at the standard current specification to bring the state of charge of the battery to the fourth state of charge SOC 4;
and discharging the battery according to the standard current specification so as to enable the state of charge of the battery to be the preset state of charge.
Optionally, the first current specification I1 is smaller than the second current specification I2, the second current specification I2 is smaller than the third current specification I3, the third current specification I3 is smaller than the fourth current specification I4, and the fourth current specification I4 is smaller than the standard current specification.
Optionally, the first determining module includes:
the control submodule is used for controlling the battery to stand at a second preset temperature for a second preset time, and the second preset temperature is smaller than the first preset temperature;
the charging submodule is used for charging the battery to a charging cut-off voltage according to a standard current specification, and then charging the battery in a preset small-current constant-current mode so that the charge state of the battery is 100%;
and the discharging submodule is used for discharging the battery according to the standard current specification so as to determine the battery capacity value of the battery.
Optionally, the preset capacity value is a product of a preset coefficient and a rated capacity value of the battery.
A third aspect of the present disclosure provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method provided by the first aspect of the present disclosure.
By adopting the technical scheme, when the battery capacity value of the battery is larger than or equal to the preset capacity value, the current state of charge of the battery is the preset state of charge, and the standing time of the battery at the first preset temperature reaches the first preset time, the battery is controlled to carry out N times of charging and discharging operations, wherein each time of charging and discharging operations comprises a plurality of times of charging operations and a plurality of times of discharging operations, the plurality of times of charging operations are carried out at least based on two current specifications, the plurality of times of discharging operations are carried out at least based on two current specifications, after the battery is controlled to carry out N times of charging and discharging operations, the test frequency record is added with 1, and the step of determining the battery capacity value of the battery is executed again until the battery capacity value is smaller than the preset value, and when the battery capacity value is smaller than the preset capacity value, the service life of the battery is determined according to the current value of the test frequency record. So, through adopting different electric current specifications to carry out charge-discharge under first temperature of predetermineeing, can accelerate battery life test, shorten test cycle, improve the efficiency of battery life test.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a method of battery life testing according to an exemplary embodiment.
FIG. 2 is a flow chart illustrating a method of battery life testing according to another exemplary embodiment.
Fig. 3 is a block diagram illustrating a battery life testing apparatus according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In order to solve the problems of relatively single battery life test and long test period in the related art, the disclosure provides a battery life test method, a battery life test device and a readable storage medium. Referring to fig. 1, fig. 1 is a flowchart illustrating a Battery life testing method according to an exemplary embodiment, which may be applied to an electronic device with processing capability, such as a processor, a Battery Management Unit (BMU), and the like. As shown in fig. 1, the method may include the following steps.
In step 11, a battery capacity value of the battery is determined.
In the method for testing the battery life, the battery capacity value of the battery is usually used as a main indication index of the battery life, and the battery capacity value represents the electric quantity discharged by the battery under certain conditions (discharge rate, temperature, end voltage and the like).
In step 12, if the battery capacity value is greater than or equal to the preset capacity value, the current state of charge of the battery is the preset state of charge, and the standing time of the battery at the first preset temperature reaches the first preset time, controlling the battery to perform N-time charging and discharging operations.
In the present disclosure, the preset capacity value may be stored in the battery management unit in advance. In one embodiment, the predetermined capacity value may be a fixed value set by a tester, for example, if the test object is a lead-acid battery, the predetermined capacity value may be 16AH, 19AH, or the like. If the test object is a lithium ion battery, the preset capacity value may be 40AH, 42AH, and so on. In another embodiment, the predetermined capacity value may be a product of a predetermined coefficient, typically 0.8 in a battery life test, and a rated capacity value of the battery. In this embodiment, the preset coefficient is stored in the battery management unit in advance, so that the battery management unit can calculate the preset capacity value from the preset coefficient and the rated capacity value of the battery after knowing the rated capacity value of the battery. Therefore, when the service life of different batteries is tested, the tester does not need to set different fixed values in the battery management unit, and only needs to store the preset coefficient once before testing, so that the workload of the tester is simplified, and the intelligence of the battery service life test is improved.
It should be noted that the battery capacity value determined in step 11 is the amount of electricity discharged by the battery under certain conditions (discharge rate, temperature, end voltage, etc.), that is, the battery needs to be discharged when determining the battery capacity value, and after the discharge is completed, the voltage of the battery is the end voltage, and the state of charge of the battery is 0 or a small value close to 0, so in step 12, the preset state of charge may be 0 or a small value close to 0.
In general, when a battery starts to be charged and discharged, the battery needs to be kept still at a certain temperature for a first preset time to ensure that a pole piece inside the battery is fully contacted with an electrolyte, so that the pole piece is completely soaked, and thus, in the formation process of the battery, a complete Solid Electrolyte Interface (SEI) film can be formed on the surface of the pole piece, and the battery can exert good electrical performance in the later period. The first preset time period may be 20min, 1h, and the like, and the first preset time period is not specifically limited in the present disclosure.
In addition, in the related art, the battery life is tested by cyclically charging and discharging the battery under normal temperature and low temperature conditions by using a single current specification, and the inventor considers that, compared with normal temperature and low temperature, high temperature can accelerate the reduction of chemical activity inside the battery, so that the battery capacity value is accelerated to decay, thereby achieving the purpose of accelerating the battery life test and shortening the test period, therefore, in the present disclosure, the first preset temperature may be the highest temperature in the environmental temperature range in which the battery operates, or a temperature smaller than the highest preset value, for example, if the battery operates in the environmental temperature range of [ -40 ℃, 60 ℃), the first preset temperature may be 60 ℃, or may be a temperature slightly smaller than 60 ℃ (for example, 55 ℃, 50 ℃, and so on).
The inventor considers that the current specification of charging and discharging of the battery is different in the actual charging and discharging circulation process, if the battery is circularly charged and discharged by using a single current specification in the battery life test, may cause the test result to be inconsistent with the actual application, so that the reliability of the test result is reduced, and, considering that the battery is cyclically charged and discharged by using a single current specification to test the life of the battery, the test is relatively single, the test period is long, and therefore, in the disclosure, after the battery is kept still at a first preset temperature for a first preset time, controlling the battery to perform N times of charging and discharging operations, wherein N is a positive integer, and each round of charging and discharging operation comprises a plurality of times of charging operation and a plurality of times of discharging operation, wherein the plurality of times of charging operation are carried out based on at least two current specifications, and the plurality of times of discharging operation are carried out based on at least two current specifications.
In step 13, after controlling the battery to perform N times of charge and discharge operations, adding 1 to a test number record, wherein an initial value of the test number record is 0.
In the present disclosure, the value of the test number record refers to the number of times that the battery capacity value of the battery is determined, and the determined battery capacity value is greater than or equal to the preset capacity value, and 1 is added to the test number record after the battery is subjected to N times of charging and discharging operations each time.
In step 14, the step of determining the battery capacity value of the battery is re-executed until the battery capacity value is less than the preset capacity value.
After adding 1 to the test number record, the above steps S11 to S13 are re-executed until the battery capacity value is less than the preset capacity value. In the disclosure, if the capacity value of the battery is smaller than the preset capacity value, it indicates that the battery cannot be used any more after the end of its life, and the test is ended.
In step 15, if the battery capacity value is smaller than the preset capacity value, the life of the battery is determined according to the current value recorded by the test times.
And ending the test when the determined battery quantity value is smaller than the preset capacity value, and determining the service life of the battery according to the current value recorded by the test times. It should be noted that, it is prior art to determine the battery life according to the current value of the test time record, and details are not repeated here.
By adopting the technical scheme, when the battery capacity value of the battery is larger than or equal to the preset capacity value, the current state of charge of the battery is the preset state of charge, and the standing time of the battery at the first preset temperature reaches the first preset time, the battery is controlled to carry out N times of charging and discharging operations, wherein each time of charging and discharging operations comprises a plurality of times of charging operations and a plurality of times of discharging operations, the plurality of times of charging operations are carried out at least based on two current specifications, the plurality of times of discharging operations are carried out at least based on two current specifications, after the battery is controlled to carry out N times of charging and discharging operations, the test frequency record is added with 1, and the step of determining the battery capacity value of the battery is executed again until the battery capacity value is smaller than the preset value, and when the battery capacity value is smaller than the preset capacity value, the service life of the battery is determined according to the current value of the test frequency record. So, through adopting different electric current specifications to carry out charge-discharge under first temperature of predetermineeing, can accelerate battery life test, shorten test cycle, improve the efficiency of battery life test.
To facilitate a better understanding of the battery life testing methods provided by the present disclosure, a full example is described below.
FIG. 2 is a flow chart illustrating a method of battery life testing according to another exemplary embodiment. As shown in fig. 2, step 11 in fig. 1 may include step 111, step 112, and step 113.
In step 111, the battery is controlled to stand at a second preset temperature for a second preset time, where the second preset temperature is lower than the first preset temperature.
It should be noted that, in order to ensure the accuracy of the battery capacity value, in the present disclosure, the battery is first controlled to stand at a second preset temperature for a second preset time, where the second preset temperature is less than the first preset temperature, and the second preset temperature is usually 25 ℃. The second preset time period may be the same as or different from the first preset time period. For example, the second preset time period may be 20min or 15min, and so on. After controlling the battery to stand at the second preset temperature for the second preset time period, step 112 is executed.
In step 112, the battery is charged to the charge cut-off voltage with the standard current specification, and then the battery is charged in a preset low-current constant-current mode so that the state of charge of the battery is 100%.
Before discharging the battery to determine the battery capacity value, the battery needs to be charged so that the state of charge of the battery is 100%. Specifically, the battery is first charged to a charge cut-off voltage with a standard current specification, and then the battery is charged in a preset low-current constant-current mode so that the state of charge of the battery is 100%. The current value of the standard current specification is 1C, and the current value range of the current specification corresponding to the preset small current constant current mode can be [0.001C, 0.5C ].
In step 113, the battery is discharged at the standard current specification to determine a battery capacity value of the battery.
After the battery is fully charged, the battery is discharged according to the standard current specification until the charge of the battery is discharged, namely, the voltage of the battery is the end voltage, the state of charge of the battery is 0 or close to 0, and when the battery is discharged or the state of charge of the battery is 0 or close to 0, the battery capacity value of the battery is calculated. After the battery capacity value is determined, step 16 is performed.
In step 16, it is determined whether the battery capacity value is greater than or equal to the preset capacity value, whether the current state of charge of the battery is the preset state of charge, and whether the standing time of the battery at the first preset temperature reaches the first preset time. And if the current charge state of the battery is greater than or equal to the preset capacity value, the current charge state of the battery is a preset charge state, and the standing time of the battery at the first preset temperature reaches a first preset time, executing the steps 121 to 127, otherwise, ending the test.
In step 121, the battery is charged with the fourth current specification I4 to set the state of charge of the battery to the second state of charge SOC2, and then discharged with the fourth current specification I4 to set the state of charge of the battery to the first state of charge SOC1, wherein the preset state of charge is smaller than the first state of charge SOC1, and the first state of charge SOC1 is smaller than the second state of charge SOC 2.
In step 122, the battery is charged at the third current specification I3 to bring the state of charge of the battery to a third state of charge SOC3, and then discharged at the third current specification I3 to bring the state of charge of the battery to a second state of charge SOC2, wherein the second state of charge SOC2 is less than the third state of charge SOC 3.
In step 123, the battery is charged at the second current specification I2 to bring the state of charge of the battery to a fourth state of charge SOC4, and thereafter, the battery is discharged at the second current specification I2 to bring the state of charge of the battery to a third state of charge SOC3, wherein the third state of charge SOC3 is less than the fourth state of charge SOC 4.
In step 124, the battery is charged at the first current specification I1 to bring the state of charge of the battery to the fourth state of charge SOC4, after which the battery is discharged at the first current specification I1 to bring the state of charge of the battery to the first state of charge SOC 1.
In step 125, the battery is charged at the fourth current specification I4 to bring the state of charge of the battery to the second state of charge SOC2, after which the battery is discharged at the standard current specification to bring the state of charge of the battery to the first state of charge SOC 1.
In step 126, the battery is charged at the third current specification I3 to bring the state of charge of the battery to the third state of charge SOC3, after which the battery is charged at the standard current specification to bring the state of charge of the battery to the fourth state of charge SOC 4.
In step 127, the battery is discharged at the standard current specification to set the state of charge of the battery to the predetermined state of charge.
Wherein, each round of charging and discharging operations includes the steps 121 to 127. In the present disclosure, only one embodiment of the charge and discharge operation is shown, and other embodiments of the charge and discharge operation, for example, three, five, six, and other states of charge are set, and similarly, three, five, six, and other current specifications are set, and the battery life test method provided by the present disclosure is also applicable to the case where the charge and discharge are performed using different current specifications in different states of charge intervals.
Further, as is clear from battery characteristics, since a large charge state corresponds to a section in which large current charging and discharging is not allowed, in the present disclosure, the first current specification I1, the second current specification I2, the third current specification I3, and the fourth current specification I4 satisfy the following relationships: the first current specification I1 is smaller than the second current specification I2, the second current specification I2 is smaller than the third current specification I3, the third current specification I3 is smaller than the fourth current specification I4, the fourth current specification I4 is smaller than the standard current specification. Therefore, the purposes of accelerating the battery life test, shortening the test period and improving the battery life test efficiency can be realized, and the problem of overcharge or overdischarge of the battery can be avoided.
After the execution of one round of charge and discharge operations, step 17 is executed.
In step 17, it is determined whether the number of charging and discharging operations is N, if so, step 18 is executed, otherwise, steps 121 to 127 are executed again until the number of charging and discharging operations is N.
In step 18, the test number record is incremented by 1. Then, the process returns to step 111 and steps 111 to 16 are executed again. If the battery capacity value is greater than or equal to the preset capacity value, the steps 121 to 18 are continuously executed, otherwise, the step 19 is executed.
In step 19 (step 15), if the battery capacity value is smaller than the preset capacity value, the life of the battery is determined according to the current value recorded by the test times.
By adopting the technical scheme, the battery is subjected to charge-discharge cycle test in a high-temperature environment, the attenuation of the battery can be accelerated at high temperature relative to normal temperature and low temperature, and the battery is discharged at least based on two current specifications and charged at least based on two current specifications. Therefore, under the condition of ensuring that the battery is not overcharged or overdischarged, the attenuation of the service life of the battery is greatly accelerated, so that the aims of shortening the test period and improving the test efficiency of the service life of the battery are fulfilled.
Based on the same inventive concept, the present disclosure also provides a battery life testing device. Fig. 3 is a block diagram illustrating a battery life testing apparatus according to an exemplary embodiment. As shown in fig. 3, the apparatus may include:
a first determination module 31 for determining a battery capacity value of the battery;
the control module 32 is configured to control the battery to perform N rounds of charging and discharging operations if the battery capacity value is greater than or equal to a preset capacity value, the current state of charge of the battery is a preset state of charge, and the standing time of the battery at a first preset temperature reaches a first preset time, where each round of charging and discharging operations includes a plurality of charging operations and a plurality of discharging operations, the plurality of charging operations are performed based on at least two current specifications, the plurality of discharging operations are performed based on at least two current specifications, and N is a positive integer;
the counting module 33 is configured to add 1 to a test time record after controlling the battery to perform N times of charging and discharging operations, where an initial value of the test time record is 0;
a triggering module 34, configured to trigger the first determining module to re-execute the step of determining the battery capacity value of the battery until the battery capacity value is smaller than the preset capacity value;
a second determining module 35, configured to determine the life of the battery according to the current value recorded by the test times if the battery capacity value is smaller than the preset capacity value.
Optionally, the control module 32 is further configured to:
charging the battery with a fourth current specification I4 to bring the state of charge of the battery to a second state of charge SOC2, and then discharging the battery with the fourth current specification I4 to bring the state of charge of the battery to a first state of charge SOC1, the preset state of charge being less than the first state of charge SOC1, the first state of charge SOC1 being less than the second state of charge SOC 2;
charging the battery at a third current specification I3 to bring the state of charge of the battery to a third state of charge SOC3, and thereafter discharging the battery at the third current specification I3 to bring the state of charge of the battery to a second state of charge SOC2, the second state of charge SOC2 being less than the third state of charge SOC 3;
charging the battery at a second current specification I2 to bring the state of charge of the battery to a fourth state of charge SOC4, and thereafter discharging the battery at the second current specification I2 to bring the state of charge of the battery to a third state of charge SOC3, the third state of charge SOC3 being less than the fourth state of charge SOC 4;
charging the battery at a first current specification I1 to bring the state of charge of the battery to the fourth state of charge SOC4, followed by discharging the battery at the first current specification I1 to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the fourth current specification I4 to bring the state of charge of the battery to the second state of charge SOC2, followed by discharging the battery at a standard current specification to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the third current specification I3 to bring the state of charge of the battery to the third state of charge SOC3, followed by charging the battery at the standard current specification to bring the state of charge of the battery to the fourth state of charge SOC 4;
and discharging the battery according to the standard current specification so as to enable the state of charge of the battery to be the preset state of charge.
Optionally, the first current specification I1 is smaller than the second current specification I2, the second current specification I2 is smaller than the third current specification I3, the third current specification I3 is smaller than the fourth current specification I4, and the fourth current specification I4 is smaller than the standard current specification.
Optionally, the first determining module 31 may include:
the control submodule is used for controlling the battery to stand at a second preset temperature for a second preset time, and the second preset temperature is smaller than the first preset temperature;
the charging submodule is used for charging the battery to a charging cut-off voltage according to a standard current specification, and then charging the battery in a preset small-current constant-current mode so that the charge state of the battery is 100%;
and the discharging submodule is used for discharging the battery according to the standard current specification so as to determine the battery capacity value of the battery.
Optionally, the preset capacity value is a product of a preset coefficient and a rated capacity value of the battery.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
In an exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the battery life testing method described above is also provided.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned battery life testing method when executed by the programmable apparatus.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (8)
1. A method for testing battery life, the method comprising:
determining a battery capacity value of the battery;
if the battery capacity value is larger than or equal to a preset capacity value, the current charge state of the battery is a preset charge state, and the standing time of the battery at a first preset temperature reaches a first preset time, controlling the battery to perform N times of charging and discharging operations, wherein each time of charging and discharging operations comprises multiple charging operations and multiple discharging operations, the multiple charging operations are performed based on at least two current specifications, the multiple discharging operations are performed based on at least two current specifications, and N is a positive integer;
adding 1 to a test frequency record after controlling the battery to carry out N times of charging and discharging operations, wherein the initial value of the test frequency record is 0;
re-executing the step of determining the battery capacity value of the battery until the battery capacity value is less than the preset capacity value;
if the battery capacity value is smaller than the preset capacity value, determining the service life of the battery according to the current value recorded by the test times;
each round of charging and discharging operation comprises the following charging operation and discharging operation:
charging the battery with a fourth current specification I4 to bring the state of charge of the battery to a second state of charge SOC2, and then discharging the battery with the fourth current specification I4 to bring the state of charge of the battery to a first state of charge SOC1, the preset state of charge being less than the first state of charge SOC1, the first state of charge SOC1 being less than the second state of charge SOC 2;
charging the battery at a third current specification I3 to bring the state of charge of the battery to a third state of charge SOC3, and thereafter discharging the battery at the third current specification I3 to bring the state of charge of the battery to a second state of charge SOC2, the second state of charge SOC2 being less than the third state of charge SOC 3;
charging the battery at a second current specification I2 to bring the state of charge of the battery to a fourth state of charge SOC4, and thereafter discharging the battery at the second current specification I2 to bring the state of charge of the battery to a third state of charge SOC3, the third state of charge SOC3 being less than the fourth state of charge SOC 4;
charging the battery at a first current specification I1 to bring the state of charge of the battery to the fourth state of charge SOC4, followed by discharging the battery at the first current specification I1 to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the fourth current specification I4 to bring the state of charge of the battery to the second state of charge SOC2, followed by discharging the battery at a standard current specification to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the third current specification I3 to bring the state of charge of the battery to the third state of charge SOC3, followed by charging the battery at the standard current specification to bring the state of charge of the battery to the fourth state of charge SOC 4;
and discharging the battery according to the standard current specification so as to enable the state of charge of the battery to be the preset state of charge.
2. The method of claim 1, wherein the first current specification I1 is less than the second current specification I2, the second current specification I2 is less than the third current specification I3, the third current specification I3 is less than the fourth current specification I4, and the fourth current specification I4 is less than the standard current specification.
3. The method of claim 1, wherein determining the battery capacity value comprises:
controlling the battery to stand at a second preset temperature for a second preset time, wherein the second preset temperature is lower than the first preset temperature;
charging the battery to a charging cut-off voltage according to a standard current specification, and then charging the battery in a preset small current constant current mode to enable the charge state of the battery to be 100%;
discharging the battery with the standard current specification to determine a battery capacity value of the battery.
4. Method according to any one of claims 1 to 3, characterized in that said preset capacity value is the product of a preset coefficient and a nominal capacity value of said battery.
5. A battery life testing apparatus, the apparatus comprising:
the first determination module is used for determining a battery capacity value of the battery;
the control module is used for controlling the battery to carry out N times of charging and discharging operations if the battery capacity value is larger than or equal to a preset capacity value, the current state of charge of the battery is a preset state of charge, and the standing time of the battery at a first preset temperature reaches a first preset time, wherein each time of charging and discharging operations comprises a plurality of times of charging operations and a plurality of times of discharging operations, the plurality of times of charging operations are carried out at least based on two current specifications, the plurality of times of discharging operations are carried out at least based on two current specifications, and N is a positive integer;
the counting module is used for adding 1 to a test frequency record after controlling the battery to carry out N times of charging and discharging operations, wherein the initial value of the test frequency record is 0;
the triggering module is used for triggering the first determining module to execute the step of determining the battery capacity value of the battery again until the battery capacity value is smaller than the preset capacity value;
the second determining module is used for determining the service life of the battery according to the current value recorded by the test times if the battery capacity value is smaller than the preset capacity value;
the control module is further configured to:
charging the battery with a fourth current specification I4 to bring the state of charge of the battery to a second state of charge SOC2, and then discharging the battery with the fourth current specification I4 to bring the state of charge of the battery to a first state of charge SOC1, the preset state of charge being less than the first state of charge SOC1, the first state of charge SOC1 being less than the second state of charge SOC 2;
charging the battery at a third current specification I3 to bring the state of charge of the battery to a third state of charge SOC3, and thereafter discharging the battery at the third current specification I3 to bring the state of charge of the battery to a second state of charge SOC2, the second state of charge SOC2 being less than the third state of charge SOC 3;
charging the battery at a second current specification I2 to bring the state of charge of the battery to a fourth state of charge SOC4, and thereafter discharging the battery at the second current specification I2 to bring the state of charge of the battery to a third state of charge SOC3, the third state of charge SOC3 being less than the fourth state of charge SOC 4;
charging the battery at a first current specification I1 to bring the state of charge of the battery to the fourth state of charge SOC4, followed by discharging the battery at the first current specification I1 to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the fourth current specification I4 to bring the state of charge of the battery to the second state of charge SOC2, followed by discharging the battery at a standard current specification to bring the state of charge of the battery to the first state of charge SOC 1;
charging the battery at the third current specification I3 to bring the state of charge of the battery to the third state of charge SOC3, followed by charging the battery at the standard current specification to bring the state of charge of the battery to the fourth state of charge SOC 4;
and discharging the battery according to the standard current specification so as to enable the state of charge of the battery to be the preset state of charge.
6. The apparatus of claim 5, wherein the first current specification I1 is less than the second current specification I2, the second current specification I2 is less than the third current specification I3, the third current specification I3 is less than the fourth current specification I4, and the fourth current specification I4 is less than the standard current specification.
7. The apparatus of claim 5, wherein the first determining module comprises:
the control submodule is used for controlling the battery to stand at a second preset temperature for a second preset time, and the second preset temperature is smaller than the first preset temperature;
the charging submodule is used for charging the battery to a charging cut-off voltage according to a standard current specification, and then charging the battery in a preset small-current constant-current mode so that the charge state of the battery is 100%;
and the discharging submodule is used for discharging the battery according to the standard current specification so as to determine the battery capacity value of the battery.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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