CN115639490A - Battery performance testing method and device, battery, vehicle and computer program product - Google Patents
Battery performance testing method and device, battery, vehicle and computer program product Download PDFInfo
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Abstract
The application provides a method and a device for testing battery performance, a battery, a vehicle and a computer program product, which relate to the technical field of battery testing, wherein the method comprises the following steps: circularly cooling and heating the battery to change the temperature of the battery from a first preset value to a second preset value; in the process of circularly cooling and heating the battery, discharging control is carried out on the battery in a first temperature interval, and charging control is carried out on the battery in a second temperature interval, wherein the temperature value in the first temperature interval is lower than or equal to a third preset value, and the temperature value in the second temperature interval is higher than or equal to a fourth preset value; and performing performance test on the battery according to the cycle times of the discharge control and the charge control. According to the embodiment of the application, the high-low temperature impact and charge-discharge use scenes are combined, so that the actual use performance of the battery at the extreme temperature can be accurately verified.
Description
Technical Field
The application relates to the technical field of battery testing, in particular to the technical field of testing of power batteries of electric vehicles, and specifically relates to a method and a device for testing battery performance, a battery, a vehicle and a computer program product.
Background
The power battery is used as a key part of a new energy vehicle, and the safety, reliability and durability of the power battery are extremely important. In order to ensure that the battery can reliably operate under different environmental conditions, environmental reliability tests need to be performed on the battery. At present, the testing means of the battery is usually limited to the conventional performance test, which causes the battery performance test to have great limitation, and the practical use performance of the battery at extreme temperature cannot be verified.
Disclosure of Invention
The application provides a method and a device for testing battery performance, a battery, a vehicle and a computer program product, which are used for solving the problem that the actual service performance of the battery at an extreme temperature cannot be verified in the conventional battery performance test.
According to a first aspect of the present application, there is provided a method for testing battery performance, comprising:
circularly cooling and heating the battery to change the temperature of the battery from a first preset value to a second preset value, wherein the first preset value is smaller than the second preset value;
in the process of circularly cooling and heating the battery, performing discharge control on the battery in a first temperature interval, and performing charge control on the battery in a second temperature interval, wherein a temperature value in the first temperature interval is lower than or equal to a third preset value, a temperature value in the second temperature interval is higher than or equal to a fourth preset value, the first preset value is smaller than the third preset value, and the second preset value is larger than the fourth preset value;
and performing performance test on the battery according to the cycle times of the discharge control and the charge control.
According to a second aspect of the present application, there is provided a battery performance testing apparatus comprising:
the temperature impact module is used for circularly cooling and heating the battery so as to enable the temperature of the battery to change from a first preset value to a second preset value, wherein the first preset value is smaller than the second preset value;
the charging and discharging control module is used for performing discharging control on the battery in a first temperature interval and performing charging control on the battery in a second temperature interval in the process of performing cooling treatment and heating treatment on the battery in a circulating manner, wherein the temperature value of the first temperature interval is lower than or equal to a third preset value, the temperature value of the second temperature interval is higher than or equal to a fourth preset value, the first preset value is smaller than the third preset value, and the second preset value is larger than the fourth preset value;
and the performance test module is used for carrying out performance test on the battery according to the cycle times of the discharge control and the charge control.
According to a third aspect of the present application, a battery is provided, where a performance test result determined by using the test method of the first aspect of the present application satisfies a preset condition.
According to a fourth aspect of the present application, there is provided a vehicle including the battery of the third aspect of the present application.
According to a fifth aspect of the present application, there is provided a computer program product comprising a computer program or instructions which, when executed by a processor, implements the method of the first aspect of the present application.
In the embodiment of the application, the battery is subjected to cooling treatment and heating treatment circularly, in the process, the battery is subjected to discharge control in a first temperature interval (namely, a low-temperature interval), the battery is subjected to charge control in a second temperature interval (namely, a high-temperature interval), and the performance of the battery is tested according to the number of cycles of the discharge control and the charge control. The process provides a battery performance testing means combining high and low temperature impact and charging and discharging use scenes. Due to the fact that high-low temperature impact and charging and discharging use scenes are combined, the actual use performance of the battery at the extreme temperature can be accurately verified through the process.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present application, nor do they limit the scope of the present application. Other features of the present application will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not intended to limit the present application. Wherein:
fig. 1 is a flowchart of a method for testing battery performance according to an embodiment of the present disclosure;
FIG. 2 is a schematic time-line diagram illustrating steps of a test method provided by an embodiment of the present application;
FIG. 3 is a block diagram of a system for testing battery performance according to an embodiment of the present disclosure;
fig. 4 is a structural diagram of a device for testing battery performance according to an embodiment of the present application.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
At present, the testing means of the battery is usually limited to the conventional performance test, which causes the battery performance test to have great limitation, and the practical use performance of the battery at extreme temperature cannot be verified. The inventor provides a battery performance testing means combining high and low temperature impact and charging and discharging use scenes, and the testing means can accurately verify the actual use performance of the battery at extreme temperature.
The following describes a method for testing battery performance, a device for testing battery performance, a battery, a vehicle, and a computer program product, respectively, according to embodiments of the present application, with reference to the accompanying drawings and detailed description.
Referring to fig. 1, fig. 1 is a flowchart of a method for testing battery performance according to an embodiment of the present disclosure.
As shown in fig. 1, the method for testing the performance of the battery includes the following steps:
step a: circularly cooling and heating the battery to change the temperature of the battery from a first preset value to a second preset value, wherein the first preset value is smaller than the second preset value;
step b: in the process of circularly cooling and heating the battery, performing discharge control on the battery in a first temperature interval, and performing charge control on the battery in a second temperature interval, wherein a temperature value in the first temperature interval is lower than or equal to a third preset value, a temperature value in the second temperature interval is higher than or equal to a fourth preset value, the first preset value is smaller than the third preset value, and the second preset value is larger than the fourth preset value;
step c: and performing performance test on the battery according to the cycle times of the discharge control and the charge control.
In the step a, the battery (i.e. the battery to be tested, which may be a single battery core, a battery pack, or a battery system) is subjected to cooling and heating in a circulating manner, which may be understood as high and low temperature impact on the battery, where the first preset value may be a lowest temperature value of the high and low temperature impact, and the second preset value may be a highest temperature value of the high and low temperature impact. Considering the actual use scene of the vehicle, the temperature of-20 ℃ to 45 ℃ can cover most of the user use conditions, so the first preset value can be-20 ℃ for example, and the second preset value can be 45 ℃ for example.
In step a, after the battery temperature is reduced from the second preset value to the first preset value, the temperature of the battery may be raised after the first preset value is maintained for a certain period of time, that is, the temperature lowering process may include a temperature lowering stage and a maintaining stage. Accordingly, after the battery temperature is increased from the first preset value to the second preset value, the battery temperature may be maintained at the second preset value for a certain period of time and then be subjected to the next cooling process, that is, the heating process may include a heating stage and a maintaining stage. As an example, when the battery temperature decreases to a first preset value, the temperature may be continuously maintained for 1 hour; when the temperature of the battery rises to the second preset value, the temperature may be continuously maintained for 1 hour.
In the step b, in the cooling process, when the temperature of the battery is lower than or equal to a third preset value, the battery can be subjected to discharge control, and the control can be understood as low-temperature discharge control. And in the temperature raising process, when the temperature of the battery is higher than or equal to the fourth preset value, the battery can be subjected to charging control, which can be understood as high-temperature charging control.
In the whole testing process, through the cyclic low-temperature discharge control and high-temperature charge control, the use scene of user charge and discharge at extremely severe temperature can be embodied, the testing process of the battery performance can be more accordant with the actual use scene, and the actual use performance of the battery at the extreme temperature can be accurately verified.
In the step c, the performance of the battery can be tested when the cycle number of the discharge control and the charge control reaches a certain value.
The number of times of performing the performance test on the battery in the whole test process may be multiple times, and it may be understood that the performance test is performed on the battery in stages in the whole test process. Therefore, the change rule of the temperature impact performance of the battery along with the use time can be better embodied, and the actual use performance of the battery under the extreme temperature can be more accurately verified. By performing a performance test on the battery, a test result of the battery performance can be obtained, and the test result can be understood as a test result for characterizing the battery performance.
It should be noted that, in step c, the types and test parameters of the performance tests performed each time may be the same, or may be different or not completely the same; the type of performance test performed at a time may include one or more. For example, a capacity test may be performed in an initial stage, a Hybrid Pulse Power Characteristics (HPPC) test may be performed in an intermediate stage, and a peak discharge Power test may be performed in an end stage; or, the capacity test and the HPPC test can be carried out in the initial stage and the intermediate stage, and the capacity test, the HPPC test and the peak discharge power test can be carried out in the end stage; and so on. The performance test performed at each stage may be flexibly selected according to the requirement of the battery performance test, which is not limited in the embodiment of the present application.
It should be further noted that, the steps a to c are not sequentially executed in time sequence, in the whole test process, the step a is executed in stages, and each stage is circularly and continuously executed, the step b is circularly executed in the process of executing the step a, and the step c is executed in stages. In order to better understand the relationship between step a, step b and step c in time, fig. 2 shows a schematic time-axis diagram of the above steps. As shown in fig. 2, step a may be executed in N cycles, and in the process of executing step a, the number of cycles of step b is also N; subsequently, step c may be performed once; subsequently, continuing to execute the step a by M times of circulation, wherein the circulation frequency of the step b is also M times in the process of executing the step a; subsequently, step c is performed again; and so on until the cycle ends. Here, N may or may not be equal to M.
The method for testing battery performance according to the embodiment of the present application may be implemented by a system for testing battery performance, and fig. 3 shows an architecture diagram of a system for testing battery performance (hereinafter referred to as "testing system") as an example.
As shown in fig. 3, the test System includes an incubator 31, a water cooler 32, a Battery Management System (BMS) 33, a power supply 34, a charge and discharge control device 35, and an upper computer PC 36. The incubator 31 can be understood as a large box operating according to set environmental parameters, simulating different temperatures, humidities. The water cooling machine 32 is used for simulating a heat management system of the whole vehicle, and the temperature of the battery 37 to be tested is controlled in a cooling, heating or heat preservation mode and the like. The BMS 33 is configured to monitor a state (e.g., temperature, voltage, current, state of charge, etc.) of the battery 37 to be tested, provide communication, safety, cell balancing, management control for the battery 37 to be tested, and provide a communication interface with an application device, and the BMS 33 may be integrated inside the battery 37 to be tested or may be provided separately from the battery 37 to be tested. The power supply 34 may be understood as a low voltage power supply (e.g., 12V power supply) that supplies power to a main power supply Chip, such as a System Base Chip (SBC), within the BMS 33. Water chiller 32 and power supply 34 may be collectively referred to as an auxiliary system. The charge and discharge control device 35 is also called a charge and discharge machine, and is used to control or adjust charge and discharge current, and is used to charge the battery 37 to be measured or discharge the battery to an external power grid (or called feed). The upper computer PC 36 can be understood as a test computer integrated with the upper computer, and the upper computer PC 36 is used for acquiring data, processing data, issuing control instructions, and providing a display interface for displaying information to display information. The upper computer PC 36 CAN be in communication connection with the charge and discharge control device and the BMS 33 through a CAN bus so as to realize data transmission and instruction transmission between the upper computer PC 36 and the charge and discharge control device 35 and the BMS 33.
In the test system, the temperature reduction treatment and the temperature rise treatment of the battery 37 to be tested can be realized through the incubator 31 and the water cooler 32, and the charge control and the discharge control of the battery 37 to be tested can be realized through the charge and discharge control device 35. When it is necessary to test the battery 37 to be tested, the battery 37 to be tested may be placed in the incubator 31, and the battery 37 to be tested may be connected to the BMS 33, the water cooler 32, and the charge and discharge control device 35.
The test system operates as follows: the BMS establishes communication with the charge-discharge control equipment through the CAN bus and reports the voltage, current, temperature, SOC, insulation resistance value, high-voltage interlocking, fault signals and other information of the battery to be tested to the PC. And the upper computer PC synchronously stores the output voltage and current of the charge and discharge control equipment and the information reported by the BMS, and uses the single voltage and temperature of the battery to be tested as working condition cut-off conditions, and when the working condition cut-off conditions are met, the upper computer PC can automatically control the test process to be cut off (or stopped) or automatically control the test process to jump to the next step.
As an example, the temperature of the incubator is set between-20 ℃ and 45 ℃ during the test process, the temperature and the flow of the water cooling machine can be executed according to a control strategy, and the temperature of the environmental chamber is recorded and the insulation resistance, the current, the capacity, the energy and the voltage and the temperature of the battery are continuously monitored during the test process. The control strategy of the water cooler can mainly comprise two sections, namely a cooling section (the water temperature is-20 ℃) and a heating section (the water temperature is 45 ℃), and the flow rate of the water cooler can be determined according to the actual output capacity and the requirement of the water pump.
In the embodiment of the application, the battery is subjected to cooling treatment and heating treatment circularly, in the process, the battery is subjected to discharge control in a first temperature interval (namely, a low-temperature interval), the battery is subjected to charge control in a second temperature interval (namely, a high-temperature interval), and the performance of the battery is tested according to the cycle number of the discharge control and the charge control, so that the test result of the performance of the battery is obtained. The process provides a battery performance testing means combining high and low temperature impact and charging and discharging use scenes. Due to the fact that high and low temperature impact and charging and discharging use scenes are combined, the actual use performance of the battery at the extreme temperature can be accurately verified in the process.
In some embodiments, before the cycling the battery for cooling and heating, the method further comprises:
pre-adjusting a State of Charge (SOC) value of the battery to a first threshold.
In this embodiment, this process of adjusting the SOC value of the battery to the first threshold value in advance may be understood as a preprocessing process. Because in the whole test process, the battery needs to be subjected to charge and discharge control circularly, and the electric quantity of the battery can float up and down in the charge and discharge process, the SOC value of the battery is adjusted to the first threshold value in advance before the battery is tested, so that the electric quantity of the battery is adjusted to the proper test initial electric quantity, and the test is more reasonable.
For the selection of the initial testing electric quantity, the actual wide SOC range of the user is considered to be 20% to 80%, so the first threshold value can be determined to be 50% or other suitable values.
In the embodiment, before the battery is tested, the SOC value of the battery is pre-adjusted to the first threshold value, so that the test is more reasonable, and the actual service performance of the battery at the extreme temperature can be more accurately verified.
In some embodiments, the discharging control of the battery in the first temperature interval and the charging control of the battery in the second temperature interval include:
when the temperature of the battery is detected to be reduced to the third preset value, controlling the battery to continuously discharge at a first multiplying power for a first time, wherein the discharge occurs in the process of cooling the battery;
when the temperature of the battery is detected to be increased to the fourth preset value, controlling the battery to be continuously charged at a second rate for a second time, wherein the charging is carried out in the process of heating the battery;
the second multiplying power is greater than the first multiplying power, the first time length is greater than the second time length, and the product of the first multiplying power and the first time length is equal to the product of the second multiplying power and the second time length.
In view of the fact that the discharge current of the battery at a low temperature is generally smaller than that at a normal temperature and the dischargeable capacity is smaller as the temperature is lower, the discharge current can be similarly smaller, and the charge-discharge current at a high temperature is generally larger than that at a low temperature, so that the battery can maintain a more stable charge-discharge space throughout the test process, in this embodiment, the battery is controlled to discharge at a relatively low rate for a relatively long period of time in the low-temperature discharge control stage, and the battery is controlled to charge at a relatively high rate for a relatively short period of time in the high-temperature charge control stage.
As an example, in the temperature-decreasing stage, when the lowest temperature of the battery reaches-10 ℃, the battery may be controlled to be discharged at X1C rate for 3 hours. In the temperature rising stage, when the highest temperature of the battery reaches 35 ℃, the battery can be controlled to be charged at X2C rate for 2 hours. Here, X1/X2=2/3, and assuming that the discharge rate of the battery in the temperature decreasing stage is 0.05C, i.e., X1=0.05, the charge rate of the battery in the temperature increasing stage is 0.075C, i.e., X2=0.075.
According to the embodiment, through the charge-discharge control strategy, the discharge amount and the charge amount of the battery in the whole test process can be kept relatively balanced, the SOC value of the battery is enabled to be moderately floated above and below the first threshold value, the situation that the battery is overcharged or overdischarged in the test process can be avoided, and therefore the test process can be ensured to be smoothly carried out.
In some embodiments, in the process of cooling the battery, the battery is controlled to be lowered from the third preset value to the first preset value within a third time period, and the temperature of the battery is controlled to be maintained at the first preset value within a fourth time period;
in the process of heating the battery, controlling the battery to be heated from the fourth preset value to the second preset value in a fifth time period, and controlling the temperature of the battery to be kept at the second preset value in a sixth time period;
wherein the first duration is greater than the third duration and less than a sum of the third duration and the fourth duration;
the second duration is greater than the fifth duration and less than a sum of the fifth duration and the sixth duration.
In this embodiment, in the cooling stage, the discharging process of the battery not only covers the time period from the third preset value to the first preset value, but also continues for a period of time when the battery reaches the first preset value; accordingly, in the warm-up phase, the charging process of the battery not only covers the time period from the fourth preset value to the second preset value, but also continues for a period of time when the battery reaches the second preset value, which can ensure that the battery is discharged at the extreme low temperature and charged at the extreme high temperature during the test.
According to the embodiment, by adopting the charge and discharge strategy, the battery testing process can better accord with the use scene of user charge and discharge at the extreme severe temperature, and the battery performance testing process can better accord with the actual use scene, so that the actual use performance of the battery at the extreme temperature can be verified more accurately.
In some embodiments, said performing a performance test on said battery according to a number of cycles of said discharging control and said charging control comprises:
and performing a discharge capacity test and an HPPC test on the battery once when the cycle times of the discharge control and the charge control increase by a third threshold value.
The performance tests referred to in this embodiment include both discharge capacity tests and HPPC tests, which may be performed multiple times in stages throughout the test.
As an example, the third threshold may be set to 50, that is, the discharge capacity test and the HPPC test are performed once every 50 cycles, and the entire test process may be performed 200 cycles in total, that is, the discharge capacity test and the HPPC test may be performed once each of the cycles of 50, 100, 150, and 200 times, that is, the discharge capacity test and the HPPC test are performed four times in total, or in the entire test process, the discharge capacity test and the HPPC test are performed in four stages.
The following provides specific procedures for the discharge capacity test and the HPPC test, respectively.
The discharge capacity test procedure was as follows:
1) The temperature of the incubator is 25 ℃, the temperature of the water chiller is 25 ℃, and the flow rate is 10 liters/minute;
2) Discharging the battery to a monomer voltage value of V _ min according to a preset discharge standard;
3) Standing for 1 hour;
4) Charging the battery to a monomer voltage value of V _ max according to a preset charging standard;
5) Standing for 1 hour;
6) Discharging the battery to a monomer voltage value of V _ min according to a preset discharge standard;
7) Standing for 1 hour.
And (4) carrying out co-circulation for three times in the steps from step 4) to step 7), measuring the discharge capacity of three times, and averaging to obtain the discharge capacity C _ avg at the stage.
The HPPC test procedure is as follows:
1) Charging the battery to a full-charge state according to a preset charging standard;
2) Standing for 1 hour;
3) Discharging at a rated current I1, wherein the discharge capacity is 10% of the discharge capacity C _ avg at the stage;
4) Standing for 30 minutes;
5) Discharging for 10 seconds at rated current I1;
6) Standing for 40 seconds;
7) Charging for 10 seconds at rated current I1;
8) Standing for 30 minutes;
and step 3) to step 8) are circulated for nine times.
And calculating the charging and discharging direct current internal resistance at the stage according to a formula, wherein:
the calculation formula of the charging Direct Current Internal resistance (DCR) is as follows: DCR _ charge = (V _ end-V _ start)/I1. Here, V _ start represents a voltage value corresponding to the pulse charging start time, V _ end represents a voltage value corresponding to the pulse charging end time, V _ start represents a voltage value at the start time corresponding to step 7), and V _ end represents a voltage value at the end time corresponding to step 7).
The calculation formula of the discharging direct current internal resistance is as follows: DCR _ discharge = (V _ start-V _ end)/I1. Here, V _ start represents a voltage value corresponding to the pulse discharge start time, V _ end represents a voltage value corresponding to the pulse charge/discharge end time, V _ start represents a voltage value at the start time corresponding to step 5), and V _ end represents a voltage value at the end time corresponding to step 5).
In the pulse charging and discharging process, one point can be collected every 0.1 second. During the standing process, the acquisition frequency can be 1 second.
The preset discharge standard and the preset charge standard related in the discharge capacity test and the HPPC test may be a charge and discharge standard commonly used in the industry at present, or may be other preset charge and discharge standards, which is not limited to this.
In this embodiment, by performing the above test on the battery during the test, the performance decay tendency (including the capacity decay tendency, the DCR growth tendency, and the like) of the battery under long-term high and low temperature impact can be verified more accurately, and the environmental durability of the battery can be examined more accurately.
In some embodiments, the method further comprises:
and after the accumulated times of the discharge capacity tests and the accumulated times of the HPPC tests reach a fourth threshold value, performing a peak discharge power test on the battery.
The performance test according to this embodiment includes a peak discharge power (P _ max) test, which may be performed only once at the end stage of the test.
As an example, the fourth threshold may be set to 4, that is, the discharge capacity test and the HPPC test are performed in four stages throughout the test. Assuming that the whole test process can be cycled for 200 times in total, namely, the discharge capacity test and the HPPC test can be respectively performed once when the cycle number is 50, 100, 150 and 200 times, namely, the discharge capacity test and the HPPC test are performed four times in total, and after the 200-cycle test is finished, the peak discharge power test can be performed.
The parameters used for the peak discharge power test may be: the temperature of the battery is 25 ℃ during testing, the SOC of the battery is 50%, and the constant power discharge time adopted during testing is not less than 30 seconds.
In this embodiment, the battery is tested in the test process, so that the peak discharge power attenuation of the battery under long-term high and low temperature impact can be verified more accurately, and the environmental durability of the battery can be examined more accurately.
To sum up, this application embodiment is through adopting the battery performance test means that high low temperature strikes and charge-discharge use the scene and combine together, not only can inspect the performance of battery under extremely abominable temperature condition, can also inspect whether the functional state of battery satisfies the design requirement. In addition, the high-low temperature impact on the battery can simulate a frosting and dewing scene, so that the sealing design performance of the battery and the protection performance of the shell can be tested. In addition, after the test process is finished, whether the related functions of the battery can be automatically recovered or not can be checked according to the insulation resistance value of the battery, the state of a relay, the voltage of the battery, the current of the battery, a fault signal, the SOC, the maximum voltage of the battery, the minimum voltage of the battery, the maximum temperature of the battery, the minimum temperature of the battery, the high-voltage interlocking state and other parameter signals.
Referring to fig. 4, fig. 4 is a structural diagram of a battery performance testing apparatus (hereinafter referred to as a "testing apparatus") according to an embodiment of the present disclosure.
As shown in fig. 4, the test apparatus 40 includes:
the temperature impact module 41 is configured to cyclically perform cooling processing and heating processing on the battery, so that the temperature of the battery changes from a first preset value to a second preset value, where the first preset value is smaller than the second preset value;
the charging and discharging control module 42 is configured to perform discharging control on the battery in a first temperature interval and perform charging control on the battery in a second temperature interval in the processes of performing temperature reduction and temperature rise on the battery in a circulating manner, where a temperature value in the first temperature interval is lower than or equal to a third preset value, a temperature value in the second temperature interval is higher than or equal to a fourth preset value, the first preset value is smaller than the third preset value, and the second preset value is larger than the fourth preset value;
and a first performance testing module 43, configured to perform a performance test on the battery according to the cycle number of the discharge control and the charge control.
Optionally, the testing device 40 further comprises:
and the adjusting module is used for pre-adjusting the SOC value of the battery to a first threshold value.
Optionally, the charge and discharge control module 42 includes:
the discharging control unit is used for controlling the battery to continuously discharge at a first multiplying power for a first time when the temperature of the battery is detected to be reduced to the third preset value, and the discharging occurs in the process of cooling the battery;
the charging control unit is used for controlling the battery to be continuously charged at a second rate for a second time when the temperature of the battery is detected to rise to the fourth preset value, and the charging is carried out in the process of heating the battery;
the second multiplying power is greater than the first multiplying power, the first time length is greater than the second time length, and the product of the first multiplying power and the first time length is equal to the product of the second multiplying power and the second time length.
Optionally, the temperature impact module 41 is specifically configured to:
in the process of cooling the battery, controlling the battery to be reduced from the third preset value to the first preset value within a third time period, and controlling the temperature of the battery to be kept at the first preset value within a fourth time period;
in the process of heating the battery, controlling the battery to be heated from the fourth preset value to the second preset value in a fifth time period, and controlling the temperature of the battery to be kept at the second preset value in a sixth time period;
wherein the first duration is greater than the third duration and less than a sum of the third duration and the fourth duration;
the second duration is greater than the fifth duration and less than a sum of the fifth duration and the sixth duration.
Optionally, the first performance testing module 43 includes:
the first test unit is used for testing the discharge capacity of the battery once when the cycle times of the discharge control and the charge control are increased by a third threshold;
and the second testing unit is used for carrying out HPPC (hybrid pulse power characteristic) test on the battery once when the cycle number of the discharge control and the charge control is increased by a third threshold value.
Optionally, the testing device 40 further comprises:
and the second performance testing module is used for testing the peak discharge power of the battery after the accumulated times of the discharge capacity tests and the accumulated times of the HPPC tests reach a fourth threshold value.
The testing device of the embodiment of the application can realize each process of the method embodiment and achieve the same beneficial effect, and is not repeated here for avoiding repetition.
The embodiment of the application further provides a battery, and the battery is a battery with a performance test result determined by the test method provided by the embodiment of the application meeting the preset condition.
The embodiment of the present application further provides a vehicle, which includes the battery in the above embodiment, and is not repeated here for avoiding repetition.
The methods in the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described herein are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user equipment, a core network appliance, an OAM, or other programmable device.
The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; optical media such as digital video disks; but may also be a semiconductor medium such as a solid state disk. The computer readable storage medium may be volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present application may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present application can be achieved, and the present invention is not limited herein.
The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for testing battery performance, comprising:
circularly cooling and heating the battery to change the temperature of the battery from a first preset value to a second preset value, wherein the first preset value is smaller than the second preset value;
in the process of circularly cooling and heating the battery, performing discharge control on the battery in a first temperature interval, and performing charge control on the battery in a second temperature interval, wherein a temperature value in the first temperature interval is lower than or equal to a third preset value, a temperature value in the second temperature interval is higher than or equal to a fourth preset value, the first preset value is smaller than the third preset value, and the second preset value is larger than the fourth preset value;
and performing performance test on the battery according to the cycle times of the discharge control and the charge control.
2. The method of testing of claim 1, wherein prior to said cycling the battery through a cooling process and a heating process, the method further comprises:
and pre-adjusting the SOC value of the battery to a first threshold value.
3. The method according to claim 1, wherein the controlling of the discharge of the battery in a first temperature interval and the controlling of the charge of the battery in a second temperature interval comprises:
when the temperature of the battery is detected to be reduced to the third preset value, controlling the battery to continuously discharge at a first multiplying power for a first time, wherein the discharge occurs in the process of cooling the battery;
when the temperature of the battery is detected to be increased to the fourth preset value, controlling the battery to be continuously charged at a second rate for a second time, wherein the charging is carried out in the process of heating the battery;
the second multiplying power is greater than the first multiplying power, the first time length is greater than the second time length, and the product of the first multiplying power and the first time length is equal to the product of the second multiplying power and the second time length.
4. The method according to claim 3, wherein during the cooling process of the battery, the battery is controlled to be lowered from the third preset value to the first preset value within a third time period, and the temperature of the battery is controlled to be maintained at the first preset value within a fourth time period;
in the process of heating the battery, controlling the battery to be heated from the fourth preset value to the second preset value within a fifth time period, and controlling the temperature of the battery to be kept at the second preset value within a sixth time period;
wherein the first duration is greater than the third duration and less than a sum of the third duration and the fourth duration;
the second duration is greater than the fifth duration and less than a sum of the fifth duration and the sixth duration.
5. The method according to claim 1, wherein the performing a performance test on the battery according to the number of cycles of the discharge control and the charge control includes:
and carrying out a discharge capacity test and a mixed pulse power characteristic (HPPC) test on the battery once when the cycle times of the discharge control and the charge control are increased by a third threshold value.
6. The method of testing of claim 5, further comprising:
and after the accumulated number of the discharge capacity tests and the accumulated number of the HPPC tests reach a fourth threshold value, performing a peak discharge power test on the battery.
7. A device for testing battery performance, comprising:
the temperature impact module is used for circularly cooling and heating the battery so as to enable the temperature of the battery to change from a first preset value to a second preset value, wherein the first preset value is smaller than the second preset value;
the charging and discharging control module is used for performing discharging control on the battery in a first temperature interval and performing charging control on the battery in a second temperature interval in the processes of performing cooling treatment and heating treatment on the battery circularly, wherein the temperature value in the first temperature interval is lower than or equal to a third preset value, the temperature value in the second temperature interval is higher than or equal to a fourth preset value, the first preset value is smaller than the third preset value, and the second preset value is larger than the fourth preset value;
and the performance test module is used for carrying out performance test on the battery according to the cycle times of the discharge control and the charge control.
8. A battery, characterized in that the battery is a battery whose performance test result determined by the test method according to any one of claims 1 to 6 satisfies a preset condition.
9. A vehicle characterized by comprising the battery according to claim 8.
10. A computer program product comprising a computer program or instructions for implementing the method of any one of claims 1 to 6 when the computer program or instructions are executed by a processor.
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