CN113782845B - Method and device for obtaining charge and discharge power of lithium battery - Google Patents
Method and device for obtaining charge and discharge power of lithium battery Download PDFInfo
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- CN113782845B CN113782845B CN202110872731.5A CN202110872731A CN113782845B CN 113782845 B CN113782845 B CN 113782845B CN 202110872731 A CN202110872731 A CN 202110872731A CN 113782845 B CN113782845 B CN 113782845B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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Abstract
The embodiment of the application discloses a method and a device for acquiring charge and discharge power of a battery. The method comprises the following steps: acquiring a first discharge capacity value of a battery for performing a discharge operation at a first temperature value, and a second discharge capacity value of the battery for performing the discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value; according to the first discharging capacity value and the second discharging capacity value, capacity change information of the battery at a first temperature value relative to a second temperature value is determined; and calculating the maximum charge and discharge power value corresponding to the first temperature value of the battery according to the capability change information and the maximum charge and discharge power value corresponding to the second temperature value of the battery.
Description
Technical Field
The embodiment of the application relates to the field of information processing, in particular to a method and a device for acquiring charge and discharge power of a lithium battery.
Background
With the development of lithium battery technology, the performance of the lithium battery is gradually increased, the development of the electric vehicle is rapid, and the sales volume of the lithium battery is gradually increased. The lithium ion lithium battery is widely used in the fields of electric vehicles, communication equipment, storage equipment and the like due to the characteristics of small volume, high energy density, small self-discharge, no memory effect, long cycle life and the like. A single lithium ion lithium battery is generally powered by a form of lithium battery pack under the condition of high-power use of an electric vehicle due to limited capacity and power. The lithium battery pack is built by a plurality of modules, and the modules consist of smaller electric cores. The same type Of battery cell can be used for electric vehicles with different driving mileage and different power characteristics, and the SOC (State Of Charge) Of the battery cell can be different.
In practical application, the maximum charge-discharge power value of the lithium battery can be determined according to the SOC of the battery cell. Because the maximum charge and discharge power value of the lithium battery is affected by temperature, how to quickly obtain a discharge power meter at the actual temperature of the lithium battery is a problem to be solved.
Disclosure of Invention
In order to solve any technical problem, the embodiment of the application provides a method and a device for obtaining charge and discharge power of a lithium battery.
In order to achieve the purpose of the embodiment of the present application, the present application provides a method for obtaining charge and discharge power of a lithium battery, including:
acquiring a first discharge capacity value of the lithium battery for performing a discharge operation at a first temperature value, and performing a second discharge capacity value of the lithium battery for performing the discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
according to the first discharging capacity value and the second discharging capacity value, capacity change information of the lithium battery at a first temperature value relative to a second temperature value is determined;
and calculating the maximum charge and discharge power value corresponding to the first temperature value of the lithium battery according to the capability change information and the maximum charge and discharge power value corresponding to the second temperature value of the lithium battery.
Optionally, the first discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a first temperature value;
the second discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a second temperature value.
Optionally, the first discharging capability value and the second discharging capability value are capability information corresponding to performing a discharging operation when the state of charge SOC of the lithium battery is the same;
according to the first discharging capability value and the second discharging capability value, determining capability change information of the lithium battery at a first temperature value relative to a second temperature value comprises the following steps:
and calculating a ratio between the first discharge capacity value and the second discharge capacity value, and taking the ratio as the capacity change information.
Optionally, the first discharging capability value and the second discharging capability value are obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of SOC is obtained by the following method, including:
and selecting the numerical value of the sampling point of the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different charge states SOC corresponding to the second temperature value and the maximum charge-discharge power value.
Optionally, the calculating the maximum charge-discharge power value of the lithium battery corresponding to the first temperature value according to the capability change information and the maximum charge-discharge power value of the lithium battery corresponding to the second temperature value includes:
and calculating the product of the capacity change information and the maximum charge and discharge power value corresponding to the second temperature value to obtain the maximum charge and discharge power value of the lithium battery corresponding to the first temperature value.
Optionally, the calculating the product of the capability change information and the maximum charge-discharge power value corresponding to the second temperature value to obtain the maximum charge-discharge power value of the lithium battery at the first temperature value includes:
determining the value of the SOC corresponding to the capability change information;
determining a target maximum charge-discharge power value corresponding to the value of the SOC from the corresponding relation between different SOCs corresponding to the second temperature value and the maximum charge-discharge power value obtained in advance;
and calculating the product of the capability change information and the target maximum charge-discharge power value to obtain the maximum charge-discharge power value corresponding to the SOC value of the lithium battery at the first temperature value.
Optionally, the method further comprises:
and if the maximum charge and discharge power values corresponding to at least two SOC values of the lithium battery at the first temperature value are obtained, generating a curve of the maximum charge and discharge power values corresponding to the first temperature value according to the maximum charge and discharge power values corresponding to the at least two SOC values.
The application also provides a device for obtaining the charge and discharge power of the lithium battery, comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first discharge capacity value of a lithium battery for performing discharge operation at a first temperature value and a second discharge capacity value of the lithium battery for performing discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
the determining module is used for determining capability change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharging capability value and the second discharging capability value;
and the calculating module is used for calculating the maximum charge and discharge power value corresponding to the first temperature value of the lithium battery according to the capability change information and the maximum charge and discharge power value corresponding to the second temperature value of the lithium battery.
A storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method described above when run.
An electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the method described above.
One of the above technical solutions has the following advantages or beneficial effects:
the method comprises the steps of obtaining a first discharge capacity value of a lithium battery for performing discharge operation at a first temperature value and a second discharge capacity value of the lithium battery for performing discharge operation at a second temperature value, determining capacity change information of the lithium battery at the first temperature value relative to the second temperature value according to the first discharge capacity value and the second discharge capacity value, and calculating a maximum charge and discharge power value of the lithium battery at the first temperature value according to the capacity change information and the maximum charge and discharge power value of the lithium battery at the second temperature value, so that the calculation accuracy of the maximum charge and discharge power value can be ensured, and the calculation operation efficiency is high.
Additional features and advantages of embodiments of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of embodiments of the application. The objectives and other advantages of the embodiments of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the embodiments of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical solutions of the embodiments of the present application and not constitute a limitation to the technical solutions of the embodiments of the present application.
Fig. 1 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a second embodiment of the present disclosure;
fig. 3 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a third embodiment of the present application;
fig. 4 is a block diagram of an apparatus for obtaining charge and discharge power of a lithium battery according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
In the process of implementing the application, technical analysis is performed on the related technology, and the related technology is found to have at least the following problems, including:
in the related art, GB31467 requires that the maximum charge and discharge power of the lithium battery be tested by charging at a normal temperature of 25 ℃, adjusting the SOC, and then standing the lithium battery until the lithium battery reaches different temperatures for power testing, thereby completing the power value testing at different temperature points and different SOC points.
Because the charging and discharging operations in the actual use process of the lithium battery are carried out at the ambient temperature, and the charging operation and the discharging operation in the national standard test method are carried out at different temperatures, the accuracy of the obtained power meter is lower.
Based on the above analysis, embodiments of the present application provide solutions comprising:
example 1
Fig. 1 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to an embodiment of the present application. As shown in fig. 1, the method includes:
in an exemplary embodiment, the standard temperature value may be a temperature value used in the GB31467 requirements to test the power information, e.g., 25 ℃.
The discharging capability of the battery cell can change according to the temperature, wherein the discharging capability is lower than the charging point capability at the high temperature.
In one exemplary embodiment, the discharge capacity of the lithium battery may be obtained by detecting a discharge capacity, that is, a first discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a first temperature value; the second discharge capacity value is a discharge capacity value at which the lithium battery performs a discharge operation at a second temperature value. The discharge capacity of the battery core changes according to the temperature, wherein, compared with the discharge capacity at the normal temperature of 25 ℃, the discharge capacity at the low temperature is reduced, and thus the discharge capacity is also reduced; conversely, the discharge capacity increases at high temperatures, and the discharge capacity increases.
The discharge capacity value may be a maximum value of the discharge capacity of the lithium battery.
The discharge capacity of the lithium battery is represented by the discharge capacity value, and the realization is simple and accurate.
102, determining capability change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharging capability value and the second discharging capability value;
since the change rule of the discharge capacity of the lithium battery under different temperature conditions is the same as the change rule of the maximum charge and discharge power, the capacity change information of the lithium battery under different temperature values can be used as the change information of the maximum charge and discharge power.
and calculating the maximum charge and discharge power value corresponding to the first temperature value by taking the maximum charge and discharge power value corresponding to the second temperature value as a reference value and taking the obtained capacity change information as change information of the maximum charge and discharge power, so that the calculation accuracy of the maximum charge and discharge power value can be ensured, and the calculation operation efficiency is high.
According to the method provided by the embodiment of the invention, the first discharge capacity value of the lithium battery for performing the discharge operation at the first temperature value and the second discharge capacity value of the lithium battery for performing the discharge operation at the second temperature value are obtained, the capacity change information of the lithium battery at the first temperature value relative to the second temperature value is determined according to the first discharge capacity value and the second discharge capacity value, and then the maximum charge and discharge power value of the lithium battery corresponding to the first temperature value is calculated according to the capacity change information and the maximum charge and discharge power value of the lithium battery corresponding to the second temperature value, so that the calculation accuracy of the maximum charge and discharge power value can be ensured, and the calculation operation efficiency is high.
Example two
Fig. 2 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a second embodiment of the present application. As shown in fig. 2, the method includes:
when the SOC of the lithium battery is the same, the first discharging capacity value and the second discharging capacity value are obtained, the same obtaining conditions except different temperatures of the discharging capacities can be ensured, and the accuracy of obtained data is ensured.
In one exemplary embodiment, the standard temperature value may be a temperature value used in testing power information in the requirements of national standard 31467, e.g., 25 ℃.
The discharging capability of the battery cell can change according to the temperature, wherein the discharging capability is lower than the charging point capability at the high temperature.
In one exemplary embodiment, the discharge capacity of the lithium battery may be obtained by detecting a discharge capacity, that is, a first discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a first temperature value; the second discharge capacity value is a discharge capacity value at which the lithium battery performs a discharge operation at a second temperature value. The discharge capacity of the battery core changes according to the temperature, wherein, compared with the discharge capacity at the normal temperature of 25 ℃, the discharge capacity at the low temperature is reduced, and thus the discharge capacity is also reduced; conversely, the discharge capacity increases at high temperatures, and the discharge capacity increases.
The discharge capacity value may be a maximum value of the discharge capacity of the lithium battery.
The discharge capacity of the lithium battery is represented by the discharge capacity value, and the realization is simple and accurate.
Optionally, the obtaining operation is obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of SOC is obtained by the following method, including:
and selecting the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different charge states SOC corresponding to the second temperature value and the maximum charge and discharge power value.
And the numerical value of the sampling point of the SOC is selected as the acquisition condition of the discharge capacity value, so that the capacity change information is determined, the maximum charge-discharge power value corresponding to the sampling point of the SOC is conveniently utilized for calculation, and the accuracy of the maximum charge-discharge power value corresponding to the obtained first temperature value is ensured.
since the change rule of the discharge capacity of the lithium battery under different temperature conditions is the same as the change rule of the maximum charge and discharge power, the capacity change information of the lithium battery under different temperature values can be used as the change information of the maximum charge and discharge power.
In one exemplary embodiment, the ratio may be used as the capability change information by calculating a ratio between the first discharge capability value and the second discharge capability value.
When the discharge capacity value is represented by a discharge capacity, it is possible to calculate a ratio of a discharge capacity value at which a discharge operation is performed at a first temperature value to a discharge capacity value at which a discharge operation is performed at a second temperature value.
In practical application, the obtained ratio can be corrected by using a preset first correction parameter, and the corrected ratio is used as capability change information so as to improve the accuracy of data.
Optionally, the obtaining operation is obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of SOC is obtained by the following method, including:
and selecting the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different charge states SOC corresponding to the second temperature value and the maximum charge and discharge power value.
And the numerical value of the sampling point of the SOC is selected as the acquisition condition of the discharge capacity value, so that the capacity change information is determined, the maximum charge-discharge power value corresponding to the sampling point of the SOC is conveniently utilized for calculation, and the accuracy of the maximum charge-discharge power value corresponding to the obtained first temperature value is ensured. Step 203, calculating a maximum charge-discharge power value corresponding to the first temperature value of the lithium battery according to the capability change information and the maximum charge-discharge power value corresponding to the second temperature value of the lithium battery;
and calculating the maximum charge and discharge power value corresponding to the first temperature value by taking the maximum charge and discharge power value corresponding to the second temperature value as a reference value and taking the obtained capacity change information as change information of the maximum charge and discharge power, so that the calculation accuracy of the maximum charge and discharge power value can be ensured, and the calculation operation efficiency is high.
In an exemplary embodiment, the maximum charge-discharge power value of the lithium battery corresponding to the first temperature value may be obtained by calculating a product of the capability change information and the maximum charge-discharge power value corresponding to the second temperature value.
In practical application, the obtained maximum charge-discharge power value can be corrected by using a preset second correction parameter, and the corrected maximum charge-discharge power value is used as the maximum charge-discharge power value corresponding to the first temperature value, so that the accuracy of data is improved.
In an exemplary embodiment, the maximum charge-discharge power value of the lithium battery corresponding to the first temperature value may be obtained by calculating a product of the capability change information and the maximum charge-discharge power value corresponding to the second temperature value.
Optionally, determining a value of SOC corresponding to the capability change information; determining a target maximum charge-discharge power value corresponding to the value of the SOC from the corresponding relation between different SOCs corresponding to the second temperature value and the maximum charge-discharge power value obtained in advance; and calculating the product of the capability change information and the target maximum charge-discharge power value to obtain the maximum charge-discharge power value corresponding to the SOC value of the lithium battery at the first temperature value.
For example, when the temperature is the second temperature value T2, the sampling point of the SOC of the lithium battery is the SOC 1 ，SOC 2 ，…，SOC m The method comprises the steps of carrying out a first treatment on the surface of the The corresponding maximum charge and discharge power values are sequentially P T2,1 ，P T2,2 ，…，P T2,m The method comprises the steps of carrying out a first treatment on the surface of the Wherein m is an integer greater than or equal to 1.
If the capability change information is at the sampling point of the SOC i Obtained by sampling point SOC i Corresponding maximum charge-discharge power value P T2,i To calculate a maximum charge-discharge power value corresponding to the first temperature value, wherein i is greater than or equal to 1 and less than or equal to m.
By adopting the mode, the maximum charge and discharge power corresponding to different sampling points of the SOC can be determined, and the calculation accuracy is improved.
In practical application, the obtained maximum charge-discharge power value can be corrected by using a preset second correction parameter, and the corrected maximum charge-discharge power value is used as the maximum charge-discharge power value corresponding to the first temperature value, so that the accuracy of data is improved.
Optionally, if the maximum charge-discharge power value corresponding to at least two SOC values of the lithium battery at the first temperature value is obtained, a curve of the maximum charge-discharge power value corresponding to the first temperature value is generated according to the maximum charge-discharge power value corresponding to at least two SOC values.
And the maximum charge and discharge power values corresponding to different SOC values can be conveniently inquired by generating a curve of the maximum charge and discharge power values.
According to the method provided by the second embodiment of the invention, the first discharge capacity value of the lithium battery for performing the discharge operation at the first temperature value and the second discharge capacity value of the lithium battery for performing the discharge operation at the second temperature value are obtained, the capacity change information of the lithium battery at the first temperature value relative to the second temperature value is determined according to the first discharge capacity value and the second discharge capacity value, and then the maximum charge and discharge power value of the lithium battery corresponding to the first temperature value is calculated according to the capacity change information and the maximum charge and discharge power value of the lithium battery corresponding to the second temperature value, so that the calculation accuracy of the maximum charge and discharge power value can be ensured, and the calculation operation efficiency is high.
Example III
Fig. 3 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a third embodiment of the present application. As shown in fig. 3, the method includes:
SOC_axis＝(SOC 1 ，SOC 2 ，…，SOC m ) Wherein each element in the set soc_axis represents a different SOC sampling point; temp_axis= (t) 1 ，t 2 ，…，t n ) Wherein each element in the set temp_axis represents a different temperature value;
the maximum charge and discharge power is performed according to the power test method in GBT 31467.
wherein T (i) = (T) 1 ，t 2 ，…，t k ),T(i)<25, i=1, 2,3, …, k; wherein k is an integer greater than or equal to 2;
each element in the set T (i) represents a temperature value below 25 ℃.
Wherein the discharge capacity values of the batteries at the same temperature are different under different SOC conditions.
the ratio of the charge capacities is calculated as the capacity change information using the above-described calculation expression.
and calculating the maximum charge-discharge power value of the battery at the temperature T (i) by using the charge capacity ratio R (i) and the maximum charge-discharge power value corresponding to the normal temperature of 25 ℃.
305, maintaining charge and discharge power map higher than 25 ℃, reconstructing an SOC coordinate system SOC_rebuild lower than normal temperature at 25 ℃, equally dividing each row into 100 parts, and setting the maximum SOC as 100%; and obtaining the maximum charge and discharge Power table Power_rebuild under the rebuilt SOC coordinate SOC_rebuild by using the maximum charge and discharge Power of the battery at the temperature T (i) lower than the normal temperature of 25 ℃ and the original Power table by adopting a linear interpolation method.
constructing SOC coordinates from 0% to 100% at intervals of 101/100, SOC_new= (0, 1 x 101/100,2 x 101/100, …, 100), T (i) = (T) 1 ，t 2 ，…，t k ),t k <25, i=1, 2,3, …, k. And finally obtaining a charge and discharge maximum Power map table 'Power_rebuild' corresponding to the SOC coordinate SOC_new and the temperature coordinate T.
The method provided by the third embodiment of the application can calculate the charge and discharge power capacity of the battery under the condition of low-temperature charge more quickly, so that the test link is saved, and the economic cost is saved.
Fig. 4 is a device for obtaining charge and discharge power of a lithium battery according to an embodiment of the present application, including:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first discharge capacity value of a lithium battery for performing discharge operation at a first temperature value and a second discharge capacity value of the lithium battery for performing discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
the determining module is used for determining capability change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharging capability value and the second discharging capability value;
and the calculating module is used for calculating the maximum charge and discharge power value corresponding to the first temperature value of the lithium battery according to the capability change information and the maximum charge and discharge power value corresponding to the second temperature value of the lithium battery.
In one exemplary embodiment, the first discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a first temperature value; the second discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a second temperature value.
In one exemplary embodiment, the first discharge capability value and the second discharge capability value are capability information corresponding to performing a discharge operation when the state of charge SOC of the lithium battery is the same;
the determining module is configured to calculate a ratio between the first discharge capacity value and the second discharge capacity value, and use the ratio as the capacity change information.
In one exemplary embodiment, the first discharge capacity value and the second discharge capacity value are obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of SOC is obtained by the following method, including:
and selecting the numerical value of the sampling point of the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different charge states SOC corresponding to the second temperature value and the maximum charge-discharge power value.
In an exemplary embodiment, the calculating module is configured to calculate a product of the capability change information and a maximum charge/discharge power value corresponding to the second temperature value, to obtain a maximum charge/discharge power value corresponding to the first temperature value of the lithium battery.
In one exemplary embodiment, the computing module includes:
a first determining unit, configured to determine a value of SOC corresponding to the capability change information;
a second determining unit, configured to determine a target maximum charge-discharge power value corresponding to a numerical value of the SOC from a correspondence relationship between different SOCs corresponding to a second temperature value and the maximum charge-discharge power value, where the correspondence relationship is acquired in advance;
and the calculating unit is used for calculating the product of the capability change information and the target maximum charge-discharge power value to obtain the maximum charge-discharge power value corresponding to the SOC value of the lithium battery at the first temperature value.
In an exemplary embodiment, the apparatus further comprises:
and the generating module is used for generating a curve of the maximum charge and discharge power values corresponding to the first temperature value according to the maximum charge and discharge power values corresponding to the at least two SOC values if the maximum charge and discharge power values corresponding to the at least two SOC values of the lithium battery at the first temperature value are obtained.
According to the device provided by the embodiment of the application, the first discharge capacity value of the lithium battery for performing the discharge operation at the first temperature value and the second discharge capacity value of the lithium battery for performing the discharge operation at the second temperature value are obtained, the capacity change information of the lithium battery at the first temperature value relative to the second temperature value is determined according to the first discharge capacity value and the second discharge capacity value, and then the maximum charge and discharge power value of the lithium battery corresponding to the first temperature value is calculated according to the capacity change information and the maximum charge and discharge power value of the lithium battery corresponding to the second temperature value, so that the calculation accuracy of the maximum charge and discharge power value can be ensured, and the calculation operation efficiency is high.
Embodiments of the present application provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method described in any of the above when run.
An embodiment of the application provides an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the method as described in any of the preceding claims.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (7)
1. A method of obtaining charge and discharge power of a lithium battery, comprising:
acquiring a first discharge capacity value of the lithium battery for performing a discharge operation at a first temperature value, and performing a second discharge capacity value of the lithium battery for performing the discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value; the first discharge capacity value is a discharge capacity value of the lithium battery for performing a discharge operation at a first temperature value; the second discharge capacity value is a discharge capacity value of the lithium battery for performing a discharge operation at a second temperature value; the first discharging capability value and the second discharging capability value are capability information corresponding to performing a discharging operation when the state of charge SOC of the lithium battery is the same; calculating a ratio between the first discharge capacity value and the second discharge capacity value, and taking the ratio as capacity change information of the lithium battery at a first temperature value relative to a second temperature value;
and calculating the product of the capability change information and the maximum charge and discharge power value corresponding to the lithium battery at the second temperature value to obtain the maximum charge and discharge power value corresponding to the lithium battery at the first temperature value.
2. The method of claim 1, wherein the first discharge capacity value and the second discharge capacity value are obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of SOC is obtained by the following method, including:
and selecting the numerical value of the sampling point of the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different charge states SOC corresponding to the second temperature value and the maximum charge-discharge power value.
3. The method of claim 1, wherein calculating the product of the capability change information and the maximum charge-discharge power value corresponding to the second temperature value to obtain the maximum charge-discharge power value of the lithium battery at the first temperature value comprises:
determining the value of the SOC corresponding to the capability change information;
determining a target maximum charge-discharge power value corresponding to the value of the SOC from the corresponding relation between different SOCs corresponding to the second temperature value and the maximum charge-discharge power value obtained in advance;
and calculating the product of the capability change information and the target maximum charge-discharge power value to obtain the maximum charge-discharge power value corresponding to the SOC value of the lithium battery at the first temperature value.
4. A method according to claim 3, characterized in that the method further comprises:
and if the maximum charge and discharge power values corresponding to at least two SOC values of the lithium battery at the first temperature value are obtained, generating a curve of the maximum charge and discharge power values corresponding to the first temperature value according to the maximum charge and discharge power values corresponding to the at least two SOC values.
5. An apparatus for obtaining charge and discharge power of a lithium battery, comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first discharge capacity value of a lithium battery for performing discharge operation at a first temperature value and a second discharge capacity value of the lithium battery for performing discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value; the first discharge capacity value is a discharge capacity value of the lithium battery for performing a discharge operation at a first temperature value; the second discharge capacity value is a discharge capacity value of the lithium battery for performing a discharge operation at a second temperature value; the first discharging capability value and the second discharging capability value are capability information corresponding to performing a discharging operation when the state of charge SOC of the lithium battery is the same; the determining module is used for calculating the ratio between the first discharging capacity value and the second discharging capacity value, and taking the ratio as capacity change information of the lithium battery at a first temperature value relative to a second temperature value;
and the calculating module is used for calculating the product of the capability change information and the maximum charge and discharge power value corresponding to the lithium battery at the second temperature value to obtain the maximum charge and discharge power value corresponding to the lithium battery at the first temperature value.
6. A storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method of any of claims 1 to 4 when run.
7. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the method of any of the claims 1 to 4.
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| US10733589B2 (en) * | 2017-04-28 | 2020-08-04 | Square, Inc. | Point of sale device power management and under voltage protection |
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| CN112098853A (en) * | 2020-08-21 | 2020-12-18 | 北京车和家信息技术有限公司 | Capacity attenuation battery discharge power determination method and device |
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| JP2009219213A (en) * | 2008-03-07 | 2009-09-24 | Toyota Motor Corp | Power supply device for electric vehicle |
| CN106314170A (en) * | 2016-08-18 | 2017-01-11 | 重庆长安汽车股份有限公司 | Power calculation method and system for power battery system and electric vehicle |
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