CN111880108B

CN111880108B - Battery testing method and device, storage medium and electronic equipment

Info

Publication number: CN111880108B
Application number: CN202010688517.XA
Authority: CN
Inventors: 胡孝臣; 李俭; 周孟远; 白岩; 赵龙灿
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2023-06-30
Anticipated expiration: 2040-07-16
Also published as: CN111880108A

Abstract

The disclosure provides a method, a device, a storage medium and an electronic device for testing a battery, wherein the method comprises the following steps: acquiring battery parameters of a battery, determining a first upper limit dynamic voltage of the battery according to an upper limit SOC in the battery parameters, and determining a first lower limit dynamic voltage of the battery according to a lower limit SOC in the battery parameters; performing charge and discharge tests for preset times on the battery, performing full charge operation and full discharge operation on the battery, determining a second upper limit dynamic voltage and a second lower limit dynamic voltage, taking the second upper limit dynamic voltage as a new first upper limit dynamic voltage, and taking the second lower limit dynamic voltage as a new first lower limit dynamic voltage; and according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage, circularly executing the step of carrying out the charge and discharge test on the battery for preset times until the step of taking the second upper limit dynamic voltage as the new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as the new first lower limit dynamic voltage until the test is completed.

Description

Battery testing method and device, storage medium and electronic equipment

Technical Field

The present disclosure relates to the field of batteries, and in particular, to a method and apparatus for testing a battery, a storage medium, and an electronic device.

Background

In the prior art, when the electric vehicle is sold in the market, customers pay more attention to the service life and the service mileage of a vehicle battery, and for a whole vehicle manufacturer or a battery provider, a battery cycle life test is the most effective means for verifying the service life and the service mileage of the vehicle, so that in the research and development process of battery products (battery cells, modules and battery packs) or even after mass production, the whole vehicle manufacturer or the battery provider can perform cycle life test on the battery products, and perform life simulation on the battery products according to the tested data and results and the factors such as vehicle driving conditions, and the service life and the service mileage of the battery products are estimated. It follows that accurate battery product cycle life test data and results are particularly important.

In the related art, a fixed upper limit dynamic voltage and a fixed lower limit dynamic voltage are used for carrying out charge and discharge tests on battery cycles in a primary battery cycle life test, and as the cycle times are increased, the battery capacity is continuously reduced, and the discharge depth is continuously reduced, so that test data are deviated, and further the test result and the subsequent data application are affected.

Disclosure of Invention

In order to achieve the above objective, the present disclosure provides a method, an apparatus, a storage medium, and an electronic device for testing a battery.

In a first aspect, the present disclosure provides a method of testing a battery, the method comprising: acquiring battery parameters of a battery, wherein the battery parameters comprise an upper limit SOC, a lower limit SOC, full-power voltage and empty-power voltage; determining a first upper limit dynamic voltage of the battery according to the upper limit SOC, and determining a first lower limit dynamic voltage of the battery according to the lower limit SOC; performing a charge and discharge test on the battery for a preset number of times, the charge and discharge test including: adjusting the voltage of the battery to the first upper limit dynamic voltage through a charging operation, and adjusting the voltage of the battery to the first lower limit dynamic voltage through a discharging operation; performing full charge operation and full discharge operation on the battery, and determining a second upper limit dynamic voltage and a second lower limit dynamic voltage, wherein the full charge operation comprises the step of adjusting the voltage of the battery from the empty voltage to the full voltage through charge operation, and the full discharge operation comprises the step of adjusting the voltage of the battery from the full voltage to the empty voltage through discharge operation; taking the second upper limit dynamic voltage as a new first upper limit dynamic voltage, and taking the second lower limit dynamic voltage as a new first lower limit dynamic voltage; and according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage, circularly executing the step of carrying out the charge and discharge test on the battery for preset times until the step of taking the second upper limit dynamic voltage as the new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as the new first lower limit dynamic voltage until the test is completed.

Optionally, the determining the first upper limit dynamic voltage of the battery according to the upper limit SOC, and the determining the first lower limit dynamic voltage of the battery according to the lower limit SOC includes: determining the first upper limit dynamic voltage corresponding to the upper limit SOC through a charging capacity voltage relation, wherein the charging capacity voltage relation comprises a corresponding relation between the SOC and the dynamic voltage of the battery in a charging process; and determining the first lower limit dynamic voltage corresponding to the lower limit SOC through a discharge capacity voltage relation, wherein the charge capacity voltage relation comprises the corresponding relation between the SOC and the dynamic voltage of the battery in the discharge process.

Optionally, the performing a full charge operation and a full discharge operation on the battery, and determining the second upper limit dynamic voltage and the second lower limit dynamic voltage includes: in the process of carrying out the full charge operation on the battery, periodically acquiring a battery dynamic voltage corresponding to the battery charging capacity, updating the charging capacity voltage relation according to the battery charging capacity and the battery dynamic voltage, and determining the second upper limit dynamic voltage according to the updated charging capacity voltage relation; and in the process of carrying out the full-discharge operation on the battery, periodically obtaining the battery dynamic voltage corresponding to the battery discharge capacity, updating the discharge capacity voltage relation according to the battery discharge capacity and the battery dynamic voltage, and determining the second lower limit dynamic voltage according to the updated discharge capacity voltage relation.

Optionally, the determining the second upper limit dynamic voltage according to the updated charge capacity voltage relationship includes: determining a candidate upper limit dynamic voltage corresponding to the upper limit SOC according to the updated charge capacity voltage relation; acquiring a first discharge capacity of the battery and a total discharge capacity of the battery after the full discharge operation, wherein the first discharge capacity comprises a discharge capacity when the voltage of the battery is adjusted from an empty voltage to the candidate upper limit dynamic voltage through a charging operation and from the candidate upper limit dynamic voltage to the empty voltage through a discharging operation; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full electric voltage to the empty electric voltage; and calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity to obtain the second upper limit dynamic voltage.

Optionally, the calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity, and obtaining the second upper limit dynamic voltage includes: acquiring a first ratio of the first discharge capacity to the total discharge capacity; taking the candidate upper limit dynamic voltage as the second upper limit dynamic voltage under the condition that the first ratio is in a preset upper limit threshold range, wherein the preset upper limit threshold range is a preset threshold range taking the upper limit SOC as a median value; adjusting the candidate upper limit dynamic voltage under the condition that the first ratio is out of the preset upper limit threshold range; and continuously acquiring a new first discharge capacity according to the adjusted candidate upper limit dynamic voltage, acquiring a first ratio of the new first discharge capacity to the total discharge capacity until the first ratio is within a preset upper limit threshold range, and taking the adjusted candidate upper limit dynamic voltage as the second upper limit dynamic voltage.

Optionally, the determining the second lower dynamic voltage according to the updated discharge capacity voltage relationship includes: determining a candidate lower limit dynamic voltage corresponding to the lower limit SOC according to the updated discharge capacity voltage relation; acquiring a second discharge capacity of the battery and a total discharge capacity of the battery after the full-charge operation, wherein the second discharge capacity comprises the discharge capacity when the voltage of the battery is adjusted from the full-charge voltage to the candidate lower-limit dynamic voltage; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full electric voltage to the empty electric voltage; and calibrating the candidate lower limit dynamic voltage according to the total discharge capacity and the second discharge capacity to obtain the second lower limit dynamic voltage.

Optionally, the calibrating the candidate lower limit dynamic voltage according to the total discharge capacity and the second discharge capacity, and obtaining the second lower limit dynamic voltage includes: obtaining a second ratio of the second discharge capacity to the total discharge capacity; taking the candidate lower limit dynamic voltage as the second lower limit dynamic voltage under the condition that the second ratio is in a preset lower limit threshold range, wherein the preset lower limit threshold range is a preset threshold range taking the lower limit SOC as a median value; adjusting the candidate lower limit dynamic voltage under the condition that the second ratio is out of the preset lower limit threshold range; and continuously acquiring a new second discharge capacity according to the adjusted candidate lower limit dynamic voltage, acquiring a second ratio of the new second discharge capacity to the total discharge capacity until the second ratio is within a preset lower limit threshold range, and taking the adjusted candidate lower limit dynamic voltage as the second upper limit dynamic voltage.

In a second aspect, the present disclosure provides an apparatus for testing a battery, comprising: the parameter acquisition module is used for acquiring battery parameters of the battery, wherein the battery parameters comprise an upper limit SOC, a lower limit SOC, full-power voltage and empty-power voltage; the first voltage determining module is used for determining a first upper limit dynamic voltage of the battery according to the upper limit SOC and determining a first lower limit dynamic voltage of the battery according to the lower limit SOC; the charge and discharge test module is used for carrying out charge and discharge test on the battery for preset times, and the charge and discharge test comprises the following steps: adjusting the voltage of the battery to the first upper limit dynamic voltage through a charging operation, and adjusting the voltage of the battery to the first lower limit dynamic voltage through a discharging operation; a second voltage determining module configured to perform a full charge operation and a full discharge operation on the battery, and determine a second upper limit dynamic voltage and a second lower limit dynamic voltage, where the full charge operation includes adjusting the voltage of the battery from the empty voltage to the full voltage through a charge operation, and the full discharge operation includes adjusting the voltage of the battery from the full voltage to the empty voltage through a discharge operation; the voltage updating module is used for taking the second upper limit dynamic voltage as a new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as a new first lower limit dynamic voltage; and the cycle execution module is used for executing the steps of carrying out the charge and discharge test on the battery for preset times according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage in a cycle manner until the step of taking the second upper limit dynamic voltage as the new first upper limit dynamic voltage and the step of taking the second lower limit dynamic voltage as the new first lower limit dynamic voltage until the test is completed.

Optionally, the first voltage determining module is configured to determine the first upper limit dynamic voltage corresponding to the upper limit SOC according to a charging capacity voltage relationship, where the charging capacity voltage relationship includes a correspondence between SOC and dynamic voltage of the battery during charging; and determining the first lower limit dynamic voltage corresponding to the lower limit SOC through a discharge capacity voltage relation, wherein the charge capacity voltage relation comprises the corresponding relation between the SOC and the dynamic voltage of the battery in the discharge process.

Optionally, the second voltage determining module is configured to periodically obtain a battery dynamic voltage corresponding to a battery charging capacity during the full charge operation of the battery, update the charging capacity voltage relationship according to the battery charging capacity and the battery dynamic voltage, and determine the second upper limit dynamic voltage according to the updated charging capacity voltage relationship; and in the process of carrying out the full-discharge operation on the battery, periodically obtaining the battery dynamic voltage corresponding to the battery discharge capacity, updating the discharge capacity voltage relation according to the battery discharge capacity and the battery dynamic voltage, and determining the second lower limit dynamic voltage according to the updated discharge capacity voltage relation.

Optionally, the second voltage determining module is configured to determine, according to the updated charging capacity voltage relationship, a candidate upper limit dynamic voltage corresponding to the upper limit SOC; acquiring a first discharge capacity of the battery and a total discharge capacity of the battery after the full discharge operation, wherein the first discharge capacity comprises a discharge capacity when the voltage of the battery is adjusted from an empty voltage to the candidate upper limit dynamic voltage through a charging operation and from the candidate upper limit dynamic voltage to the empty voltage through a discharging operation; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full electric voltage to the empty electric voltage; and calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity to obtain the second upper limit dynamic voltage.

Optionally, the second voltage determining module is configured to obtain a first ratio of the first discharge capacity to the total discharge capacity; taking the candidate upper limit dynamic voltage as the second upper limit dynamic voltage under the condition that the first ratio is in a preset upper limit threshold range, wherein the preset upper limit threshold range is a preset threshold range taking the upper limit SOC as a median value; adjusting the candidate upper limit dynamic voltage under the condition that the first ratio is out of the preset upper limit threshold range; and continuously acquiring a new first discharge capacity according to the adjusted candidate upper limit dynamic voltage, acquiring a first ratio of the new first discharge capacity to the total discharge capacity until the first ratio is within a preset upper limit threshold range, and taking the adjusted candidate upper limit dynamic voltage as the second upper limit dynamic voltage.

Optionally, the second voltage determining module is configured to determine a candidate lower limit dynamic voltage corresponding to the lower limit SOC according to the updated discharge capacity voltage relationship; acquiring a second discharge capacity of the battery and a total discharge capacity of the battery after the full-charge operation, wherein the second discharge capacity comprises the discharge capacity when the voltage of the battery is adjusted from the full-charge voltage to the candidate lower-limit dynamic voltage; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full electric voltage to the empty electric voltage; and calibrating the candidate lower limit dynamic voltage according to the total discharge capacity and the second discharge capacity to obtain the second lower limit dynamic voltage.

Optionally, the second voltage determining module is configured to obtain a second ratio of the second discharge capacity to the total discharge capacity; taking the candidate lower limit dynamic voltage as the second lower limit dynamic voltage under the condition that the second ratio is in a preset lower limit threshold range, wherein the preset lower limit threshold range is a preset threshold range taking the lower limit SOC as a median value; adjusting the candidate lower limit dynamic voltage under the condition that the second ratio is out of the preset lower limit threshold range; and continuously acquiring a new second discharge capacity according to the adjusted candidate lower limit dynamic voltage, acquiring a second ratio of the new second discharge capacity to the total discharge capacity until the second ratio is within a preset lower limit threshold range, and taking the adjusted candidate lower limit dynamic voltage as the second upper limit dynamic voltage.

In a third aspect, 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 of the first aspect of the present disclosure.

In a fourth aspect, the present disclosure provides an electronic device comprising: a memory having a computer program stored thereon; a processor for executing the computer program in the memory to implement the steps of the method of the first aspect of the disclosure.

According to the technical scheme, after the battery is subjected to charge and discharge tests every preset times in the battery test, the battery is subjected to full charge and discharge operation, the first upper limit dynamic voltage and the first lower limit dynamic voltage are updated, the updated first upper limit dynamic voltage is used as the upper charging limit in the subsequent charge and discharge test, and the updated first lower limit dynamic voltage is used as the lower charging limit, so that the discharge depth is basically unchanged in the cyclic charge and discharge test, the accuracy of test data is ensured, and by the method, accurate battery cycle life test data is provided, and the service life and the service mileage of the battery product are evaluated according to the data.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a flow chart of a method of battery testing provided by an embodiment of the present disclosure;

FIG. 2 is a flow chart of a method of determining a second upper dynamic voltage provided by an embodiment of the present disclosure;

FIG. 3 is a flow chart of a method of determining a second lower dynamic voltage provided by an embodiment of the present disclosure;

FIG. 4 is a flow chart of another method of determining a second upper dynamic voltage provided by an embodiment of the present disclosure;

FIG. 5 is a flow chart of another method of determining a second lower dynamic voltage provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a battery testing apparatus according to an embodiment of the present disclosure;

fig. 7 is a block diagram of an electronic device provided by an embodiment of the present disclosure.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the following description, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not for indicating or implying a relative importance or order.

First, describing the application scenario of the present disclosure, the present disclosure may be applied to a battery test scenario, particularly in a scenario requiring more accurate battery cycle life test data, such as a scenario requiring evaluation of the service life and the service mileage of a battery product according to the battery cycle life test data. In the related art, in a cycle life test of a primary battery, an upper limit dynamic voltage corresponding to a battery Charge upper limit SOC (State of Charge) and a lower limit dynamic voltage corresponding to a discharge lower limit SOC are generally obtained at a beginning stage, and in the whole cycle life test process of the battery, the upper limit dynamic voltage is used as a Charge upper limit, the lower limit dynamic voltage is used as a discharge lower limit, a Charge and discharge test is circularly performed, and as the number of times of the cycle Charge and discharge test increases, the battery capacity is continuously reduced, and the discharge depth is continuously reduced, so that deviation occurs in test data, thereby affecting a test result and subsequent data application.

In order to solve the above problems, the present disclosure provides a method, an apparatus, a storage medium, and an electronic device for testing a battery. According to the method, after charging and discharging tests are carried out every preset times in the battery cycle life test, full charge and discharge operation is carried out on the battery, the upper limit dynamic voltage and the lower limit dynamic voltage are updated, the updated upper limit dynamic voltage is used as the upper charging limit in the subsequent charging and discharging test, the updated lower limit dynamic voltage is used as the lower charging limit, and therefore the fact that the discharging depth is basically unchanged in the cycle charging and discharging test is guaranteed, the accuracy of test data is guaranteed, and by the method, the test is carried out to obtain more accurate battery cycle life test data, and accordingly the service life and the service mileage of a battery product can be evaluated according to the data.

The present disclosure is described below in connection with specific embodiments.

Fig. 1 is a flow chart of a method of battery testing, as shown in fig. 1, according to an embodiment of the present disclosure, the method comprising:

s101, acquiring battery parameters of a battery.

The battery parameters comprise an upper limit SOC, a lower limit SOC, full-charge voltage and empty-charge voltage, the SOC represents the ratio of the remaining capacity of the battery to the capacity of the battery in a full-charge state, and the value range of the battery is 0% -100% in terms of percentage.

The upper limit SOC is a charge termination condition in the battery life cycle test, and indicates that charging is stopped when the capacity of the battery reaches the capacity corresponding to the upper limit SOC during charging. Similarly, the lower limit SOC is a discharge termination condition in the battery life cycle test, and indicates that the discharge is stopped when the capacity of the battery reaches the capacity corresponding to the lower limit SOC during the discharge.

The full charge voltage refers to the voltage when the battery is fully charged, and the empty charge voltage refers to the voltage when the battery is fully discharged.

In this step, the upper limit SOC and the lower limit SOC may be predetermined according to the test requirements of the battery manufacturer, for example, the upper limit SOC may be 97% and the lower limit SOC may be 5%; since the full-charge voltage and the empty-charge voltage of the battery are recorded in the battery specification provided by the battery manufacturer, the full-charge voltage and the empty-charge voltage can be preset according to the full-charge voltage and the empty-charge voltage recorded in the battery specification. For example, the full electrical voltage may be 4.2V (volts) and the empty electrical voltage may be 3.0V.

S102, determining a first upper limit dynamic voltage of the battery according to the upper limit SOC, and determining a first lower limit dynamic voltage of the battery according to the lower limit SOC.

In the battery test requirements, an upper limit SOC is generally given as a charge termination condition of the cycle test, and a lower limit SOC is given as a discharge termination condition of the cycle test, but in the actual battery test, the SOC cannot be accurately measured in real time, so that in the actual battery test, for convenience in measurement, an upper limit dynamic voltage corresponding to the upper limit SOC can be used as an actual charge termination condition, and a lower limit dynamic voltage corresponding to the lower limit SOC can be used as an actual discharge termination condition.

The first upper-limit dynamic voltage corresponding to the upper-limit SOC may be determined by a charge capacity voltage relationship, where the charge capacity voltage relationship includes a corresponding relationship between the SOC and the dynamic voltage of the battery during the charging process, and an example of a charge capacity voltage relationship is shown in table 1 below:

TABLE 1

As shown in table 1, when the SOC is 0%, the corresponding dynamic voltage is 3.0V; when the SOC is 5%, the corresponding dynamic voltage is 3.5V; when SOC is 10%, the corresponding dynamic voltage is 3.68V, and so on. Thus, when the upper limit SOC is 97%, the corresponding upper limit dynamic voltage is 4.15V, which can be used as a charge termination condition, that is, when the voltage of the battery reaches 4.15V after charging, the charging is stopped.

Note that the charge capacity voltage relationship may give a dynamic voltage corresponding to any value of SOC from 0% to 100%, and is not limited to the example given in table 1.

Likewise, the first lower dynamic voltage corresponding to the lower SOC may be determined by a discharge capacity voltage relationship, where the discharge capacity voltage relationship includes a corresponding relationship between the SOC and the dynamic voltage of the battery during the discharging process, and an example of a discharge capacity voltage relationship is shown in table 2 below:

TABLE 2

As shown in table 2, when the SOC is 100%, the corresponding dynamic voltage is 4.20V; when the SOC is 97%, the corresponding dynamic voltage is 4.17V; when the SOC is 95%, the corresponding dynamic voltage is 4.14V, and so on. Thus, when the lower limit SOC is 5%, the corresponding lower limit dynamic voltage can be obtained to be 3.52V by the charge capacity voltage relationship. The lower dynamic voltage of 3.52V may be used as a discharge termination condition, that is, when the battery discharge reaches 3.52V, the discharge is stopped.

Also, the discharge capacity voltage relationship may give a dynamic voltage corresponding to any value of SOC from 0% to 100%, and is not limited to the example given in table 2.

The above-described charge capacity voltage relationship and discharge capacity voltage relationship may be obtained from simulation or test data provided when the battery is produced or shipped.

S103, carrying out a preset number of charge and discharge tests on the battery, wherein the charge and discharge tests comprise: the voltage of the battery is adjusted to a first upper dynamic voltage by a charging operation, and the voltage of the battery is adjusted to a first lower dynamic voltage by a discharging operation.

The preset number of times may be set according to an actual measurement environment, and may be, for example, 50 times to 150 times, for example, 100 times.

Specifically, an example method for charge and discharge testing includes: at a constant temperature, firstly, the battery to be tested is charged by a constant current, the dynamic voltage of the battery is measured in the charging process until the dynamic voltage reaches the first upper limit dynamic voltage, the charging is stopped, the battery is placed for a certain time, for example, 10 minutes, the battery is discharged by the same constant current, the dynamic voltage of the battery is measured in the discharging process until the dynamic voltage reaches the first lower limit dynamic voltage, and the discharging is stopped, so that a complete cycle is used as a one-time charging and discharging test. Example: the constant temperature may be 25 ℃ (celsius) and the constant current may be 1A (ampere).

It should be noted that, considering that there may be residual electric quantity in the battery to be tested, before the charge-discharge test is performed, the battery to be tested may be discharged to the empty voltage, and then the charge-discharge test is performed, so as to increase the accuracy of the charge-discharge test.

In addition, the dynamic voltage of the battery is measured during the charging or discharging process, and may be measured in real time or periodically, for example, once per second or once per minute.

It should be noted that, the charge and discharge test in this step may refer to a specific implementation manner in the related art, for example, a cycle life test, which is not described herein in detail.

And S104, performing full charge operation and full discharge operation on the battery, and determining a second upper limit dynamic voltage and a second lower limit dynamic voltage.

The full charge operation includes adjusting the voltage of the battery from the empty voltage to the full voltage through a charge operation, and the full discharge operation includes adjusting the voltage of the battery from the full voltage to the empty voltage through a discharge operation.

Because the battery has been subjected to the charge-discharge test for the preset times, the battery performance is attenuated to some extent, and the current battery capacity is reduced compared with the battery capacity before the test, so that the second upper-limit dynamic voltage corresponding to the upper-limit SOC obtained according to the full charge operation is changed relative to the first upper-limit dynamic voltage, and the second lower-limit dynamic voltage corresponding to the lower-limit SOC obtained according to the full charge operation is also changed relative to the first lower-limit dynamic voltage.

In this step, before the full charge operation, the battery may be discharged, that is, the battery may be discharged until the voltage of the battery reaches the empty voltage, and then the full charge operation and the full discharge operation may be performed.

S105, taking the second upper limit dynamic voltage as a new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as a new first lower limit dynamic voltage.

And S106, circularly executing the step of carrying out the charge and discharge test on the battery for preset times according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage until the step of taking the second upper limit dynamic voltage as the new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as the new first lower limit dynamic voltage until the test is completed.

Specifically, the above steps S103 to S105 are cyclically performed according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage until the test is completed.

It should be noted that, there are various methods for determining the completion of the battery test in this step, and reference may be made to specific implementation manners in the related art, which are not limited in this disclosure. For example, the battery test may be completed by completing the charge and discharge test a preset total number of times according to the test plan, which may be an integer multiple of the preset number of times in the above step S103. For another example, the battery test may be completed when the battery capacity decays to a target value, that is, the ratio of the full discharge capacity obtained through the full charge and discharge operation to the initial battery capacity is less than or equal to the target value, which may be 80% or 60% by way of example, where the initial battery capacity may be obtained according to the battery specification provided by the battery manufacturer, or may be obtained through a full charge and discharge operation before the battery test.

According to the method, after every preset times of charge and discharge tests in the battery cycle life test, full charge and discharge operation is carried out on the battery, the upper limit dynamic voltage and the lower limit dynamic voltage are updated, the updated upper limit dynamic voltage is used as the upper charging limit in the subsequent charge and discharge test, the updated lower limit dynamic voltage is used as the lower charging limit, and therefore the fact that the discharge depth is basically unchanged in the cycle charge and discharge test is guaranteed, and the accuracy of test data is guaranteed.

Fig. 2 is a schematic diagram of one possible method for determining the second upper limit dynamic voltage in step S104, as shown in fig. 2, where the method includes:

s1041, periodically acquiring a battery dynamic voltage corresponding to the battery charging capacity in the process of fully charging the battery.

Example: in the case where the battery voltage is at the empty voltage, the full charge operation may include charging the battery at a constant temperature with a constant current such that the voltage of the battery is adjusted from the empty voltage to the full voltage. In the full charge operation process, the dynamic voltage of the battery at each measurement time can be periodically measured according to a first measurement period, the battery charge capacity at the measurement time is obtained by using the product of the time difference from the full charge operation starting time to the measurement time and the constant current, the battery charge capacity and the dynamic voltage of the battery at the measurement time are recorded, the charging is stopped until the dynamic voltage of the battery reaches the full charge voltage, the battery charge capacity and the dynamic voltage of the battery at the battery charge stopping time are recorded once at the charge stopping time, and the battery charge capacity at the charge stopping time is taken as the total charge capacity of the battery.

And S1042, updating the charge capacity voltage relation according to the battery charge capacity and the battery dynamic voltage.

Example: and (2) obtaining the SOC corresponding to each measurement time according to the ratio of the battery charging capacity at each measurement time recorded in the step S1041 to the total charging capacity, namely obtaining the corresponding relation between the SOC and the battery dynamic voltage in the current charging process, and updating the charging capacity voltage relation by using the corresponding relation.

It should be noted that, since the battery has been subjected to the charge-discharge test for the preset times, the battery performance will be attenuated to some extent, and the total charge capacity of the battery will be reduced compared with the total charge capacity before the test, and the dynamic voltage of the battery corresponding to the SOC will be different during the charge process, so that the new charge capacity voltage relationship can be obtained by the method.

S1043, determining a second upper limit dynamic voltage according to the updated charge capacity voltage relation.

For example, the second upper limit dynamic voltage corresponding to the upper limit SOC may be determined according to the updated charge capacity voltage relationship, and the determining manner may refer to the specific implementation manner in step S102, which is not described in detail.

Thus, the updated upper limit dynamic voltage can accurately correspond to the upper limit SOC, and the updated upper limit dynamic voltage is used in the subsequent charge and discharge test, so that a more accurate test result can be obtained.

Fig. 3 is a schematic diagram of one possible method for determining the second lower limit dynamic voltage in step S104, as shown in fig. 3, where the method includes:

s1044, periodically acquiring the battery dynamic voltage corresponding to the discharge capacity of the battery in the process of performing full discharge operation on the battery.

For example, in the case where the battery voltage is at the full-power voltage, the full-discharge operation may include, at a constant temperature, discharging the battery at a constant current such that the voltage of the battery is adjusted from the full-power voltage to the empty-power voltage. In the full-discharge operation process, the dynamic voltage of the battery at each measurement time can be periodically measured according to a second measurement period, the discharge capacity of the battery at the measurement time can be obtained by using the product of the discharge time difference from the full-discharge operation starting time to the measurement time and the constant current, the discharge capacity of the battery at the measurement time and the dynamic voltage of the battery are recorded until the dynamic voltage of the battery reaches the above-mentioned empty voltage, the discharge is stopped, the discharge capacity of the battery at the discharge stopping time and the dynamic voltage of the battery are recorded once at the discharge stopping time, and the discharge capacity of the battery at the discharge stopping time is the total discharge capacity of the battery.

And S1045, updating the discharge capacity voltage relation according to the discharge capacity of the battery and the dynamic voltage of the battery.

Example: and (4) obtaining the SOC corresponding to each measurement time according to the ratio of the battery discharge capacity at each measurement time recorded in the step S1044 to the total discharge capacity, namely obtaining the corresponding relation between the SOC and the battery dynamic voltage in the current charging process, and updating the discharge capacity voltage relation by using the corresponding relation.

It should be noted that, since the battery has been subjected to the charge-discharge test for the preset times, the battery performance will be attenuated to some extent, and the total discharge capacity of the battery will be reduced compared with the total discharge capacity before the test, and the dynamic voltage corresponding to the SOC will be different during the discharge process, so that the new discharge capacity voltage relationship can be obtained by the method.

S1046, determining a second lower limit dynamic voltage according to the updated discharge capacity voltage relation.

For example, the second lower limit dynamic voltage corresponding to the lower limit SOC may be determined according to the updated discharge capacity voltage relationship, and the determining manner may refer to the specific implementation manner in step S102, which is not described in detail.

Thus, the updated lower limit dynamic voltage is used in the subsequent charge and discharge test, and a more accurate test result can be obtained.

In consideration of factors such as charging loss in the full charge test, deviation of the upper limit dynamic voltage may be caused. In addition, if the period setting for measuring and recording the dynamic voltage and the battery capacity during the full charge discharge is large, for example, 10 minutes, there is a possibility that the upper limit dynamic voltage and the lower limit dynamic voltage obtained by the full charge discharge operation deviate to some extent. Therefore, in order to minimize the deviation between the upper limit dynamic voltage and the lower limit dynamic voltage obtained by the full charge and discharge operation, the first upper limit dynamic voltage and the first lower limit dynamic voltage may be calibrated to obtain more accurate values, and the first upper limit dynamic voltage and the first lower limit dynamic voltage are calibrated by using fig. 4 and 5, respectively.

Fig. 4 is a schematic diagram of one possible method for determining the second upper limit dynamic voltage in the step S1043, as shown in fig. 4, including:

s10431, determining the candidate upper limit dynamic voltage corresponding to the upper limit SOC according to the updated charge capacity voltage relation.

S10432, obtaining a first discharge capacity of the battery and a total discharge capacity of the battery after full-discharge operation.

The first discharge capacity comprises the discharge capacity when the voltage of the battery is adjusted from the empty voltage to the candidate upper limit dynamic voltage through a charging operation and is adjusted from the candidate upper limit dynamic voltage to the empty voltage through a discharging operation; the total discharge capacity includes the discharge capacity of the battery when the voltage of the battery is adjusted from a full-charge voltage to an empty-charge voltage.

One way of obtaining the first discharge capacity may include: and at a constant temperature, carrying out charging operation by using constant current, firstly adjusting the dynamic voltage of the battery from the blank voltage to the candidate upper limit dynamic voltage through the charging operation, then carrying out discharging operation by using the constant current, and obtaining the discharge capacity when the dynamic voltage of the battery is adjusted from the candidate upper limit dynamic voltage to the blank voltage through the discharging operation as the first discharge capacity. It should be noted that, since the battery dynamic voltage is unstable during the charge and discharge, a charge operation is performed before the discharge operation for more accurate measurement. In another alternative method, the above-described discharge operation may be directly performed to obtain the first discharge capacity when the dynamic voltage of the battery is the candidate upper limit dynamic voltage.

S10433, calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity to obtain a second upper limit dynamic voltage.

In this step, the candidate upper limit dynamic voltage may be calibrated to obtain the second upper limit dynamic voltage by:

first, a first ratio of the first discharge capacity to the total discharge capacity is obtained.

And secondly, taking the candidate upper limit dynamic voltage as a second upper limit dynamic voltage when the first ratio is within a preset upper limit threshold range, and adjusting the candidate upper limit dynamic voltage when the first ratio is outside the preset upper limit threshold range.

The preset upper threshold range is a threshold range which is preset with the upper limit SOC as a median value.

For example, the upper SOC may be 97%, and the preset upper threshold range may be a range of 96.5% or more and 97.5% or less, where 96.5% is the preset upper threshold range lower boundary and 97.5% is the preset upper threshold range upper boundary. When the obtained first ratio is 96.8%, confirming that the first ratio is within the preset upper limit threshold range, and taking the candidate upper limit dynamic voltage as a second upper limit dynamic voltage; when the obtained first ratio is 96.1%, confirming that the first ratio is out of the preset upper limit threshold range, and adjusting the candidate upper limit dynamic voltage, wherein the first ratio is smaller than the lower boundary of the preset upper limit threshold range, and increasing the value of the candidate upper limit dynamic voltage by a first preset step length to serve as a new candidate upper limit dynamic voltage; when the obtained first ratio is 97.6%, confirming that the first ratio is out of the preset upper limit threshold range, and adjusting the candidate upper limit dynamic voltage, and further, reducing the value of the candidate upper limit dynamic voltage by the first preset step length to serve as a new candidate upper limit dynamic voltage when the first ratio is larger than the upper limit of the preset upper limit threshold range. The first preset step size can be determined according to the actual voltage variation range, and can be 0.1V or 0.3V, for example.

And finally, under the condition that the first ratio is out of the preset upper limit threshold range, continuously acquiring a new first discharge capacity according to the adjusted candidate upper limit dynamic voltage, acquiring a first ratio of the new first discharge capacity to the total discharge capacity until the first ratio is in the preset upper limit threshold range, and taking the adjusted candidate upper limit dynamic voltage as a second upper limit dynamic voltage.

Thus, by the method, the upper limit dynamic voltage can be calibrated more accurately.

Fig. 5 is a schematic diagram of one possible method for determining the second lower limit dynamic voltage in step S1046, as shown in fig. 5, including:

s10461, determining a candidate lower limit dynamic voltage corresponding to the lower limit SOC according to the updated discharge capacity voltage relation.

S10462, obtaining a second discharge capacity of the battery and a total discharge capacity of the battery after full-discharge operation.

The second discharge capacity comprises the discharge capacity when the voltage of the battery is adjusted from the full-charge voltage to the candidate lower limit dynamic voltage; the total discharge capacity includes the discharge capacity of the battery when the voltage of the battery is adjusted from a full-charge voltage to an empty-charge voltage.

One way of obtaining the second discharge capacity may include: and at a constant temperature, performing full charge operation by using constant current, firstly adjusting the dynamic voltage of the battery from the empty voltage to the full voltage through the charge operation, then performing discharge operation by using the constant current, and obtaining the discharge capacity when the dynamic voltage of the battery is adjusted from the full voltage to the candidate lower limit dynamic voltage through the discharge operation as the second discharge capacity. It should be noted that, since the battery dynamic voltage is unstable during the charge and discharge, a charge operation is performed before the discharge operation for more accurate measurement. In another alternative method, the above-described discharging operation may be directly performed to obtain the second discharge capacity in the case where the dynamic voltage of the battery is the full-charge voltage.

S10463, calibrating the candidate lower limit dynamic voltage according to the total discharge capacity and the second discharge capacity to obtain the second lower limit dynamic voltage.

In this step, the candidate lower limit dynamic voltage may be calibrated by:

firstly, obtaining a second ratio of a second discharge capacity to a total discharge capacity;

and secondly, taking the candidate lower limit dynamic voltage as a second lower limit dynamic voltage when the second ratio is within a preset lower limit threshold range, and adjusting the candidate lower limit dynamic voltage when the second ratio is outside the preset lower limit threshold range.

The preset lower threshold range may be set in advance by, for example, subtracting the lower SOC from the SOC maximum value to obtain the SOC threshold, and then determining a threshold range with the SOC threshold as the median value as the preset lower threshold range, for example, the SOC maximum value is 100%, the lower SOC threshold is 5%, and the SOC threshold is 95%, and the preset lower threshold range may be a range with 95% as the median value, and further, for example, the preset lower threshold range may be a range of 94.5% or more and 95.5% or less, where 94.5% is the lower boundary of the preset lower threshold range, and 95.5% is the upper boundary of the preset lower threshold range. When the obtained second ratio is 94.6%, confirming that the second ratio is within the preset lower limit threshold range, and taking the candidate lower limit dynamic voltage as a second lower limit dynamic voltage; when the obtained second ratio is 94.1%, confirming that the second ratio is outside the preset lower threshold range, and adjusting the candidate lower dynamic voltage, and further, reducing the value of the candidate upper dynamic voltage by a second preset step length to serve as a new candidate upper dynamic voltage when the second ratio is smaller than the lower boundary of the preset lower threshold range; when the obtained second ratio is 95.6%, confirming that the second ratio is outside the preset lower threshold range, and adjusting the candidate lower dynamic voltage, and further, increasing the value of the candidate upper dynamic voltage by the second preset step length to serve as a new candidate upper dynamic voltage when the second ratio is larger than the upper boundary of the preset lower threshold range. The second preset step size can be determined according to the actual voltage variation range, and can be 0.1V or 0.2V, for example.

And finally, under the condition that the second ratio is out of the preset lower limit threshold range, continuously acquiring a new second discharge capacity according to the adjusted candidate lower limit dynamic voltage, acquiring a second ratio of the new second discharge capacity to the total discharge capacity until the second ratio is in the preset lower limit threshold range, and taking the adjusted candidate lower limit dynamic voltage as a second upper limit dynamic voltage.

Thus, by the method, the lower limit dynamic voltage can be calibrated more accurately.

Fig. 6 is a schematic structural diagram of a device for testing a battery according to an embodiment of the disclosure, as shown in fig. 6, the device includes:

a parameter obtaining module 601, configured to obtain battery parameters of a battery, where the battery parameters include an upper limit SOC, a lower limit SOC, a full voltage, and an empty voltage;

a first voltage determining module 602, configured to determine a first upper-limit dynamic voltage of the battery according to the upper-limit SOC, and determine a first lower-limit dynamic voltage of the battery according to the lower-limit SOC;

the charge and discharge test module 603 is configured to perform a preset number of charge and discharge tests on the battery, where the charge and discharge tests include: adjusting the voltage of the battery to the first upper limit dynamic voltage through a charging operation, and adjusting the voltage of the battery to the first lower limit dynamic voltage through a discharging operation;

A second voltage determining module 604, configured to perform a full charge operation and a full discharge operation on the battery, and determine a second upper limit dynamic voltage and a second lower limit dynamic voltage, where the full charge operation includes adjusting the voltage of the battery from the empty voltage to the full voltage through a charging operation, and the full discharge operation includes adjusting the voltage of the battery from the full voltage to the empty voltage through a discharging operation;

the voltage update module 605 is configured to take the second upper-limit dynamic voltage as a new first upper-limit dynamic voltage and the second lower-limit dynamic voltage as a new first lower-limit dynamic voltage;

the loop execution module 606 is configured to loop the step of performing the charge and discharge test on the battery for a preset number of times according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage to the step of taking the second upper limit dynamic voltage as the new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as the new first lower limit dynamic voltage until the test is completed.

Optionally, the first voltage determining module 602 is configured to determine the first upper limit dynamic voltage corresponding to the upper limit SOC according to a charging capacity voltage relationship, where the charging capacity voltage relationship includes a corresponding relationship between SOC and dynamic voltage of the battery during charging; and determining the first lower limit dynamic voltage corresponding to the lower limit SOC through a discharge capacity voltage relation, wherein the charge capacity voltage relation comprises the corresponding relation between the SOC and the dynamic voltage of the battery in the discharge process.

Optionally, the second voltage determining module 604 is configured to periodically obtain a battery dynamic voltage corresponding to a battery charging capacity during the full charge operation of the battery, update the charging capacity voltage relationship according to the battery charging capacity and the battery dynamic voltage, and determine the second upper limit dynamic voltage according to the updated charging capacity voltage relationship; and in the process of carrying out the full-discharge operation on the battery, periodically obtaining the battery dynamic voltage corresponding to the battery discharge capacity, updating the discharge capacity voltage relation according to the battery discharge capacity and the battery dynamic voltage, and determining the second lower limit dynamic voltage according to the updated discharge capacity voltage relation.

Optionally, the second voltage determining module 604 is configured to determine, according to the updated charge capacity voltage relationship, a candidate upper limit dynamic voltage corresponding to the upper limit SOC; acquiring a first discharge capacity of the battery and a total discharge capacity of the battery after the full discharge operation, wherein the first discharge capacity comprises a discharge capacity when the voltage of the battery is adjusted from a blank voltage to the candidate upper limit dynamic voltage through a charging operation and from the candidate upper limit dynamic voltage to the blank voltage through a discharging operation; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full voltage to the empty voltage; and calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity to obtain the second upper limit dynamic voltage.

Optionally, the second voltage determining module 604 is configured to obtain a first ratio of the first discharge capacity to the total discharge capacity; taking the candidate upper limit dynamic voltage as the second upper limit dynamic voltage under the condition that the first ratio is in a preset upper limit threshold range, wherein the preset upper limit threshold range is a preset threshold range taking the upper limit SOC as a median value; adjusting the candidate upper limit dynamic voltage under the condition that the first ratio is out of the preset upper limit threshold range; and continuously acquiring a new first discharge capacity according to the adjusted candidate upper limit dynamic voltage, acquiring a first ratio of the new first discharge capacity to the total discharge capacity until the first ratio is within a preset upper limit threshold range, and taking the adjusted candidate upper limit dynamic voltage as the second upper limit dynamic voltage.

Optionally, the second voltage determining module 604 is configured to determine a candidate lower limit dynamic voltage corresponding to the lower limit SOC according to the updated discharge capacity voltage relationship; acquiring a second discharge capacity of the battery and a total discharge capacity of the battery after the full discharge operation, wherein the second discharge capacity comprises the discharge capacity when the voltage of the battery is adjusted from the full voltage to the candidate lower limit dynamic voltage; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full voltage to the empty voltage; and calibrating the candidate lower limit dynamic voltage according to the total discharge capacity and the second discharge capacity to obtain the second lower limit dynamic voltage.

Optionally, the second voltage determining module 604 is configured to obtain a second ratio of the second discharge capacity to the total discharge capacity; taking the candidate lower limit dynamic voltage as the second lower limit dynamic voltage under the condition that the second ratio is in a preset lower limit threshold range, wherein the preset lower limit threshold range is a preset threshold range taking the lower limit SOC as a median value; under the condition that the second ratio is outside the preset lower limit threshold range, the candidate lower limit dynamic voltage is adjusted; and continuously acquiring a new second discharge capacity according to the adjusted candidate lower limit dynamic voltage, acquiring a second ratio of the new second discharge capacity to the total discharge capacity until the second ratio is within a preset lower limit threshold range, and taking the adjusted candidate lower limit dynamic voltage as the second upper limit dynamic voltage.

Through the device, after the battery is subjected to charge and discharge tests every preset times in the battery cycle life test, the battery is subjected to full charge and discharge operation, the upper limit dynamic voltage and the lower limit dynamic voltage are updated, the updated upper limit dynamic voltage is used as the upper charging limit in the subsequent charge and discharge test, and the updated lower limit dynamic voltage is used as the lower charging limit, so that the basically unchanged discharge depth in the cycle charge and discharge test is ensured, and the accuracy of test data is ensured.

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

Fig. 7 is a block diagram of an electronic device 700, according to an example embodiment. As shown in fig. 7, the electronic device 700 may include: a processor 701, a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.

Wherein the processor 701 is configured to control the overall operation of the electronic device 700 to perform all or part of the steps of the method for testing a battery described above. The memory 702 is used to store various types of data to support operation on the electronic device 700, which may include, for example, instructions for any application or method operating on the electronic device 700, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, and so forth. The Memory 702 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 703 can include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 702 or transmitted through the communication component 705. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 705 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.

In an exemplary embodiment, the electronic device 700 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated ASIC), digital signal processor (Digital Signal Processor, abbreviated DSP), digital signal processing device (Digital Signal Processing Device, abbreviated DSPD), programmable logic device (Programmable Logic Device, abbreviated PLD), field programmable gate array (Field Programmable Gate Array, abbreviated FPGA), controller, microcontroller, microprocessor, or other electronic components for performing the method of battery testing described above.

In another exemplary embodiment, a computer readable storage medium is also provided comprising program instructions which, when executed by a processor, implement the steps of the method of battery testing described above. For example, the computer readable storage medium may be the memory 702 including program instructions described above that are executable by the processor 701 of the electronic device 700 to perform the method of battery testing described above.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. A method of battery testing, the method comprising:

acquiring battery parameters of a battery, wherein the battery parameters comprise an upper limit SOC, a lower limit SOC, full-power voltage and empty-power voltage;

determining a first upper limit dynamic voltage of the battery according to the upper limit SOC, and determining a first lower limit dynamic voltage of the battery according to the lower limit SOC;

performing a charge and discharge test on the battery for a preset number of times, the charge and discharge test including: adjusting the voltage of the battery to the first upper limit dynamic voltage through a charging operation, and adjusting the voltage of the battery to the first lower limit dynamic voltage through a discharging operation;

performing full charge operation and full discharge operation on the battery, and determining a second upper limit dynamic voltage and a second lower limit dynamic voltage, wherein the full charge operation comprises the step of adjusting the voltage of the battery from the empty voltage to the full voltage through charge operation, and the full discharge operation comprises the step of adjusting the voltage of the battery from the full voltage to the empty voltage through discharge operation;

Taking the second upper limit dynamic voltage as a new first upper limit dynamic voltage, and taking the second lower limit dynamic voltage as a new first lower limit dynamic voltage;

according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage, circularly executing the steps of carrying out the charge and discharge test on the battery for preset times until the step of taking the second upper limit dynamic voltage as the new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as the new first lower limit dynamic voltage until the test is completed;

the step of performing full charge operation and full discharge operation on the battery, and the step of determining the second upper limit dynamic voltage and the second lower limit dynamic voltage includes:

in the process of carrying out the full charge operation on the battery, periodically acquiring a battery dynamic voltage corresponding to the battery charging capacity, updating a charging capacity voltage relation according to the battery charging capacity and the battery dynamic voltage, and determining the second upper limit dynamic voltage according to the updated charging capacity voltage relation; the charging capacity voltage relation comprises a corresponding relation between the SOC and the dynamic voltage of the battery in the charging process;

in the process of carrying out the full-discharge operation on the battery, periodically obtaining a battery dynamic voltage corresponding to the battery discharge capacity, updating a discharge capacity voltage relation according to the battery discharge capacity and the battery dynamic voltage, and determining the second lower limit dynamic voltage according to the updated discharge capacity voltage relation; the discharge capacity voltage relation comprises a corresponding relation between the SOC and the dynamic voltage of the battery in the discharge process;

The determining the second upper limit dynamic voltage according to the updated charge capacity voltage relationship includes:

determining a candidate upper limit dynamic voltage corresponding to the upper limit SOC according to the updated charge capacity voltage relation;

acquiring a first discharge capacity of the battery and a total discharge capacity of the battery after the full discharge operation, wherein the first discharge capacity comprises a discharge capacity when the voltage of the battery is adjusted from an empty voltage to the candidate upper limit dynamic voltage through a charging operation and from the candidate upper limit dynamic voltage to the empty voltage through a discharging operation; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full electric voltage to the empty electric voltage;

calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity to obtain the second upper limit dynamic voltage;

the step of calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity, and the step of obtaining the second upper limit dynamic voltage includes:

acquiring a first ratio of the first discharge capacity to the total discharge capacity;

taking the candidate upper limit dynamic voltage as the second upper limit dynamic voltage under the condition that the first ratio is in a preset upper limit threshold range, wherein the preset upper limit threshold range is a preset threshold range taking the upper limit SOC as a median value;

Adjusting the candidate upper limit dynamic voltage under the condition that the first ratio is out of the preset upper limit threshold range;

and continuously acquiring a new first discharge capacity according to the adjusted candidate upper limit dynamic voltage, acquiring a first ratio of the new first discharge capacity to the total discharge capacity until the first ratio is within a preset upper limit threshold range, and taking the adjusted candidate upper limit dynamic voltage as the second upper limit dynamic voltage.

2. The method of claim 1, wherein the determining the first upper dynamic voltage of the battery from the upper SOC and the determining the first lower dynamic voltage of the battery from the lower SOC comprises:

determining the first upper limit dynamic voltage corresponding to the upper limit SOC according to the charging capacity voltage relation;

and determining the first lower limit dynamic voltage corresponding to the lower limit SOC according to the discharge capacity voltage relation.

3. The method of claim 1, wherein the determining the second lower dynamic voltage from the updated discharge capacity voltage relationship comprises:

determining a candidate lower limit dynamic voltage corresponding to the lower limit SOC according to the updated discharge capacity voltage relation;

Acquiring a second discharge capacity of the battery and a total discharge capacity of the battery after the full-charge operation, wherein the second discharge capacity comprises the discharge capacity when the voltage of the battery is adjusted from the full-charge voltage to the candidate lower-limit dynamic voltage; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full electric voltage to the empty electric voltage;

calibrating the candidate lower limit dynamic voltage according to the total discharge capacity and the second discharge capacity to obtain the second lower limit dynamic voltage;

the step of calibrating the candidate lower limit dynamic voltage according to the total discharge capacity and the second discharge capacity, and the step of obtaining the second lower limit dynamic voltage includes:

obtaining a second ratio of the second discharge capacity to the total discharge capacity;

taking the candidate lower limit dynamic voltage as the second lower limit dynamic voltage under the condition that the second ratio is in a preset lower limit threshold range, wherein the preset lower limit threshold range is a preset threshold range taking the lower limit SOC as a median value;

adjusting the candidate lower limit dynamic voltage under the condition that the second ratio is out of the preset lower limit threshold range;

And continuously acquiring a new second discharge capacity according to the adjusted candidate lower limit dynamic voltage, acquiring a second ratio of the new second discharge capacity to the total discharge capacity until the second ratio is within a preset lower limit threshold range, and taking the adjusted candidate lower limit dynamic voltage as the second lower limit dynamic voltage.

4. An apparatus for testing a battery, the apparatus comprising:

the parameter acquisition module is used for acquiring battery parameters of the battery, wherein the battery parameters comprise an upper limit SOC, a lower limit SOC, full-power voltage and empty-power voltage;

the first voltage determining module is used for determining a first upper limit dynamic voltage of the battery according to the upper limit SOC and determining a first lower limit dynamic voltage of the battery according to the lower limit SOC;

the charge and discharge test module is used for carrying out charge and discharge test on the battery for preset times, and the charge and discharge test comprises the following steps: adjusting the voltage of the battery to the first upper limit dynamic voltage through a charging operation, and adjusting the voltage of the battery to the first lower limit dynamic voltage through a discharging operation;

a second voltage determining module configured to perform a full charge operation and a full discharge operation on the battery, and determine a second upper limit dynamic voltage and a second lower limit dynamic voltage, where the full charge operation includes adjusting the voltage of the battery from the empty voltage to the full voltage through a charge operation, and the full discharge operation includes adjusting the voltage of the battery from the full voltage to the empty voltage through a discharge operation;

The voltage updating module is used for taking the second upper limit dynamic voltage as a new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as a new first lower limit dynamic voltage;

the cycle execution module is used for circularly executing the step of carrying out the charge and discharge test on the battery for preset times according to the new first upper limit dynamic voltage and the new first lower limit dynamic voltage to the step of taking the second upper limit dynamic voltage as the new first upper limit dynamic voltage and taking the second lower limit dynamic voltage as the new first lower limit dynamic voltage until the test is completed;

the second voltage determining module is configured to periodically obtain a battery dynamic voltage corresponding to a battery charging capacity during the full charge operation of the battery, update a charging capacity voltage relationship according to the battery charging capacity and the battery dynamic voltage, and determine the second upper limit dynamic voltage according to the updated charging capacity voltage relationship; in the process of carrying out the full-discharge operation on the battery, periodically obtaining a battery dynamic voltage corresponding to the battery discharge capacity, updating a discharge capacity voltage relation according to the battery discharge capacity and the battery dynamic voltage, and determining the second lower limit dynamic voltage according to the updated discharge capacity voltage relation; the charging capacity voltage relation comprises a corresponding relation between the SOC and the dynamic voltage of the battery in a charging process, and the discharging capacity voltage relation comprises a corresponding relation between the SOC and the dynamic voltage of the battery in a discharging process;

The second voltage determining module is used for determining candidate upper limit dynamic voltages corresponding to the upper limit SOC according to the updated charge capacity voltage relation; acquiring a first discharge capacity of the battery and a total discharge capacity of the battery after the full discharge operation, wherein the first discharge capacity comprises a discharge capacity when the voltage of the battery is adjusted from an empty voltage to the candidate upper limit dynamic voltage through a charging operation and from the candidate upper limit dynamic voltage to the empty voltage through a discharging operation; the total discharge capacity comprises the discharge capacity of the battery when the voltage of the battery is adjusted from the full electric voltage to the empty electric voltage; calibrating the candidate upper limit dynamic voltage according to the first discharge capacity and the total discharge capacity to obtain the second upper limit dynamic voltage;

the second voltage determining module is used for obtaining a first ratio of the first discharge capacity to the total discharge capacity; taking the candidate upper limit dynamic voltage as the second upper limit dynamic voltage under the condition that the first ratio is in a preset upper limit threshold range, wherein the preset upper limit threshold range is a preset threshold range taking the upper limit SOC as a median value; adjusting the candidate upper limit dynamic voltage under the condition that the first ratio is out of the preset upper limit threshold range; and continuously acquiring a new first discharge capacity according to the adjusted candidate upper limit dynamic voltage, acquiring a first ratio of the new first discharge capacity to the total discharge capacity until the first ratio is within a preset upper limit threshold range, and taking the adjusted candidate upper limit dynamic voltage as the second upper limit dynamic voltage.

5. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1-3.

6. An electronic device, comprising:

a memory having a computer program stored thereon;

a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1-3.