CN110568362B - Method and device for determining cell performance parameters - Google Patents
Method and device for determining cell performance parameters Download PDFInfo
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- CN110568362B CN110568362B CN201910968743.0A CN201910968743A CN110568362B CN 110568362 B CN110568362 B CN 110568362B CN 201910968743 A CN201910968743 A CN 201910968743A CN 110568362 B CN110568362 B CN 110568362B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The embodiment of the application discloses a method and a device for determining battery cell performance parameters, comprising the following steps: two values of the target performance parameter are obtained: a first value and a second value; respectively keeping the electric core at a first value and a second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set, wherein the first electric core data set and the second electric core data set are respectively used for representing the conditions of the electric core under the first value and the second value; comparing the first cell data set with the second cell data set to obtain a comparison result; and according to the comparison result, determining the calibration value of the target performance parameter as a target value, wherein the target value is a first value or a second value. Therefore, more accurate cell performance parameters can be determined through multi-dimensional tests, the problem that the cell performance parameters determined by the existing inherent single-dimensional tests are not suitable enough is solved, and the performance parameter calibration of the cell can be more accurate and reasonable, so that the user experience of using the cell is improved.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method and an apparatus for determining electrical core performance parameters.
Background
An electric vehicle (BEV) is a vehicle driven by a motor and driven by a vehicle-mounted power supply, and meets various requirements of road traffic and safety regulations. With the development and maturity of various technologies (especially battery technologies) in the BEV, and due to the advantages of the BEV (such as no waste gas exhaust during running and no environmental pollution due to the use of electric energy, high energy utilization rate, simple structure, omission of structures such as an engine, a transmission, an oil tank, a cooling and exhaust system, and low noise), the BEV has a wide prospect, and is more and more common in people's life.
BEVs are developed and popularized with batteries occupying a critical area of influence. Before BEV leaves factory, it is necessary to determine and make relevant calibration for various performance parameters of a cell in a battery used by the BEV, and a user can know the performance of the cell through the calibration value of the cell performance parameter, but at present, the performance parameter of the cell is determined and calibrated, for example: the calibration value of the temperature is often only the temperature determined in consideration of the safe operation of the battery cell, and is not the most accurate boundary value, that is, the maximum temperature of the calibration value which is not safe to operate and conforms to other performance parameters, so that the guiding function of the calibration value for the use of the user is not accurate enough.
Based on this, it is urgently needed to provide a more accurate method for determining performance parameters of a battery cell, which can determine and calibrate performance parameter values that can enable the battery cell to work safely and exert their extreme effects, thereby improving the experience of a user in using the battery cell.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining battery cell performance parameters, which can determine more accurate battery cell performance parameters through a multi-dimensional test, and overcome the problem that the battery cell performance parameters determined by the existing inherent single-dimensional test are not suitable enough, so that the calibration of the performance parameters of the battery cell can accurately reflect more reasonable data to a user when BEV leaves a factory, and the experience of the user in using the battery cell is improved.
In a first aspect, a method for determining a cell performance parameter is provided, including:
respectively keeping the electric core at a first value and a second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set, wherein the first electric core data set and the second electric core data set are respectively used for representing the conditions of the electric core under the first value and the second value, and the first value and the second value are two values of a target performance parameter on the electric core;
comparing the first cell data set with the second cell data set to obtain a comparison result;
and according to the comparison result, determining the calibration value of the target performance parameter as a target value, wherein the target value is the first value or the second value.
Optionally, the target performance parameter includes a power of the cell, a current of the cell, or a temperature of the cell.
Optionally, if the target performance parameter is the temperature of the battery cell, the second value is greater than the first value by a preset value;
if the comparison result meets the preset adjustment condition, the method further comprises:
updating the second value, adjusting the second value to be the current second value plus the preset value, returning to execute the step of respectively keeping the electric core at the first value and the second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set until the comparison result does not meet the adjustment condition;
the determining, according to the comparison result, the calibration value of the target performance parameter as a target value specifically includes:
determining the current second value as a calibration value of the temperature of the first battery cell and other battery cells with the same model as the first battery cell.
Optionally, if the target performance parameter is the power of the battery cell, the method further includes:
obtaining first power of the battery cell as the first value based on a first calculation mode;
obtaining second power of the battery cell as the second value based on a second calculation mode;
the determining the calibration value of the target performance parameter as the target value according to the comparison result includes:
if the comparison result represents that the state of the battery cell under the first value is more healthy than the state of the battery cell under the second value, determining that the first value is the target value;
and if the comparison result represents that the state of the battery cell under the second value is more healthy than the state of the battery cell under the first value, determining that the second value is the target value.
Optionally, if it is determined that the first value is the target value, the method further includes:
determining that the first calculation mode is a target calculation mode;
calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting the target calculation mode;
if it is determined that the second value is the target value, the method further includes:
determining that the second calculation mode is a target calculation mode;
and calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting the target calculation mode.
Optionally, if the target performance parameter is the current of the battery cell, the method further includes:
obtaining a third power of the battery cell as the first value based on the first calibration current and the target calculation mode;
obtaining a fourth power of the battery cell as the second value based on a second calibration current and the target calculation mode;
the determining the calibration value of the target performance parameter as the target value according to the comparison result includes:
if the comparison result represents that the state of the battery cell under the first value is more healthy than the state of the battery cell under the second value, determining that the first calibration current is the target value;
and if the comparison result represents that the state of the battery cell under the second value is more healthy than the state of the battery cell under the first value, determining that the second calibration current is the target value.
Optionally, the cell data set includes at least one of the following data:
the data are used for representing the service life of the battery cell, representing the internal resistance change of the battery cell and representing the power output condition of the battery cell.
In a second aspect, a device for determining a cell performance parameter is further provided, including:
the test unit is used for respectively keeping the electric core at a first value and a second value, testing two groups of electric cores under the model number of the electric core, and obtaining a first electric core data set and a second electric core data set, wherein the first electric core data set and the second electric core data set are respectively used for representing the conditions of the electric core under the first value and the second value, and the first value and the second value are two values of a target performance parameter on the electric core;
a comparison unit, configured to compare the first cell data set with the second cell data set, and obtain a comparison result;
a first determining unit, configured to determine, according to the comparison result, that the calibrated value of the target performance parameter is a target value, where the target value is the first value or the second value.
Optionally, the target performance parameter includes a power of the cell, a current of the cell, or a temperature of the cell.
Optionally, if the target performance parameter is the temperature of the battery cell, the second value is greater than the first value by a preset value;
if the comparison result meets the preset adjustment condition, the device further comprises:
the updating unit is used for updating the second value, adjusting the second value to be the current second value plus the preset value, returning to execute the steps of respectively keeping the electric core at the first value and the second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set until the comparison result does not meet the adjustment condition;
the first determining unit is specifically configured to:
determining the current second value as a calibration value of the temperature of the first battery cell and other battery cells with the same model as the first battery cell.
Optionally, if the target performance parameter is the power of the battery cell, the apparatus further includes:
the first calculation unit is used for obtaining first power of the battery cell as the first value based on a first calculation mode;
the second calculation unit is configured to obtain, based on a second calculation manner, a second power of the battery cell as the second value;
the first determination unit includes:
a first determining subunit, configured to determine that the first value is the target value if the comparison result indicates that the state of the cell at the first value is more healthy than the state of the cell at the second value;
a second determining subunit, configured to determine that the second value is the target value if the comparison result indicates that the state of the battery cell at the second value is healthy compared with the state of the battery cell at the first value.
Optionally, if it is determined that the first value is the target value, the apparatus further includes:
a second determining unit, configured to determine that the first calculation method is a target calculation method;
the third calculation unit is used for calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting the target calculation mode;
if it is determined that the second value is the target value, the apparatus further includes:
a third determining unit, configured to determine that the second calculation method is a target calculation method;
and the fourth calculating unit is used for calculating the power calibration values of other electric cores under the model of the electric core by adopting the target calculating mode.
Optionally, if the target performance parameter is the current of the battery cell, the apparatus further includes:
a fifth calculating unit, configured to obtain, as the first value, a third power of the battery cell based on the first calibration current and the target calculation manner;
a sixth calculating unit, configured to obtain, based on a second calibration current and the target calculation manner, a fourth power of the battery cell as the second value;
the first determination unit includes:
a third determining subunit, configured to determine that the first calibration current is the target value if the comparison result indicates that the state of the battery cell at the first value is healthy compared with the state of the battery cell at the second value;
a fourth determining subunit, configured to determine that the second calibration current is the target value if the comparison result indicates that the state of the battery cell at the second value is healthy compared with the state of the battery cell at the first value.
Optionally, the cell data set includes at least one of the following data:
the data are used for representing the service life of the battery cell, representing the internal resistance change of the battery cell and representing the power output condition of the battery cell.
In a third aspect, an embodiment of the present application further provides an apparatus, where the apparatus includes a processor and a memory:
the memory is used for storing a computer program;
the processor is configured to perform the method provided by the first aspect above according to the computer program.
In a fourth aspect, this embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is configured to store a computer program, where the computer program is configured to execute the method provided in the first aspect.
It can be seen that, in the embodiment of the present application, a method for determining a performance parameter of a battery cell is provided, where when a target performance parameter (for example, temperature, power, and the like) of the battery cell needs to be calibrated, two values of the target performance parameter may be obtained first: the method for determining the cell performance parameter may specifically include: firstly, respectively keeping the battery cell at a first value and a second value, testing two groups of battery cells under the model to which the battery cell belongs, and obtaining a first battery cell data set and a second battery cell data set, wherein the first battery cell data set and the second battery cell data set are respectively used for representing the conditions of the battery cell under the first value and the second value; then, the first cell data set and the second cell data set may be compared to obtain a comparison result; finally, according to the comparison result, the calibration value of the target performance parameter can be determined to be the target value, and the target value is the first value or the second value. Therefore, by the method for determining the battery cell performance parameters, more accurate battery cell performance parameters can be determined through multi-dimensional tests, and the problem that the battery cell performance parameters determined by the existing inherent single-dimensional tests are not suitable enough is solved, so that the calibration of the performance parameters of the battery cell when the BEV leaves the factory can accurately reflect more reasonable data to a user, and the experience of the user in using the battery cell is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic flowchart of a method for determining a cell performance parameter in an embodiment of the present application;
fig. 2 is a schematic flow chart of another method for determining a cell performance parameter in this embodiment of the present application;
fig. 3 is a schematic flow chart of another method for determining a cell performance parameter in an embodiment of the present application;
fig. 4 is a schematic flowchart of another method for determining a cell performance parameter in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a device for determining a cell performance parameter according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an apparatus according to an embodiment of the present application.
Detailed Description
As a core component of an electric vehicle, the condition of a battery plays an important role for the use, development and popularization of the electric vehicle. For the battery of the electric vehicle, the performance parameters calibrated on the battery determine the selection of the user. At present, various manufacturers determine and calibrate performance parameters of the battery cell, such as: the calibration value for determining the temperature of the battery cell is often only the temperature determined in consideration of the safe operation of the battery cell, and is not the most accurate boundary value, that is, the maximum temperature of the calibration value which is not safe to operate and conforms to other performance parameters, so that the guidance function of the calibration value for the user is not accurate enough, for example: the determined and calibrated temperature is 40 ℃, and a user may only carefully ensure that the battery cell works in an environment within 40 ℃, but actually, the battery cell may work at 60 ℃ for a long time, and may work normally or even have a better effect, so that the calibrated temperature of 40 ℃ is not accurate enough and has a weak use guidance meaning for the user.
Based on this, the inventor finds that the test can be performed under the same condition based on a plurality of possible calibration values, so that the test result reflects the influence of the calibration values on the battery cell, and the more reasonable and accurate calibration value is determined through the test result. That is, an embodiment of the present application provides a method for determining a performance parameter of a battery cell, where when a target performance parameter (for example, temperature, power, and the like) of the battery cell needs to be calibrated, two values of the target performance parameter may be obtained first: the method for determining the cell performance parameter may specifically include: firstly, respectively keeping the battery cell at a first value and a second value, testing two groups of battery cells under the model to which the battery cell belongs, and obtaining a first battery cell data set and a second battery cell data set, wherein the first battery cell data set and the second battery cell data set are respectively used for representing the conditions of the battery cell under the first value and the second value; then, the first cell data set and the second cell data set may be compared to obtain a comparison result; finally, according to the comparison result, the calibration value of the target performance parameter can be determined to be the target value, and the target value is the first value or the second value.
Therefore, by the method for determining the battery cell performance parameters, more accurate battery cell performance parameters can be determined through multi-dimensional tests, and the problem that the battery cell performance parameters determined by the existing inherent single-dimensional tests are not suitable enough is solved, so that the calibration of the performance parameters of the battery cell when the BEV leaves the factory can accurately reflect more reasonable data to a user, and the experience of the user in using the battery cell is improved.
The following describes a specific implementation manner of a method for generating battery information in the embodiments of the present application in detail by embodiments with reference to the drawings.
Fig. 1 is a schematic flow chart of a method for determining a cell performance parameter according to an embodiment of the present disclosure. Referring to fig. 1, the method may include, for example, the following steps 101 to 103:
It is understood that the target performance parameter of the cell includes a power of the cell, a current of the cell, or a temperature of the cell. In one case, if the target performance parameter is the temperature of the battery cell, the first value may be an existing calibration value of the battery cell of the model, and the second value may be another possible calibration value obtained by adding or subtracting a preset temperature value to or from the first value. In another case, if the target performance parameter is the current of the battery cell, the first value may be an existing calibration value of the battery cell of the model, and the second value may be another possible calibration value obtained by adding or subtracting a preset current value to or from the first value. In another case, if the target performance parameter is the power of the battery cell, the first value may be a calibrated value of the battery cell of the model, which is calculated by using a first calculation method, and the second value may be a calibrated value of the battery cell of the model, which is calculated by using a second calculation method; the first calculation method may be, for example, a method of calculating power from voltage and current, and the second calculation method may be, for example, a method of calculating power from voltage and internal resistance.
It should be noted that, in the technical solution provided in this embodiment of the present application, a technical solution is provided for obtaining a plurality of cell data sets by testing a plurality of groups of cells under a model to which the cells belong when the cells respectively maintain a plurality of values, and since an implementation manner of the technical solution is similar to that of the technical solution shown in fig. 1 for obtaining 2 cell data sets by testing 2 groups of cells under a model to which the cells belong when the cells respectively maintain 2 values, for convenience of description, the embodiment of the present application is described with a case of 2 values. That is, on the basis of the embodiment of the present application, the temperature and the current may be further added or subtracted with other preset values on the basis of the first value to obtain other calibration values, and corresponding tests are performed to obtain corresponding cell data sets; the power may also be calculated to obtain other calibration values based on other calculation manners, such as a third calculation manner, and corresponding tests are performed to obtain corresponding cell data sets, where the third calculation manner may be, for example, a safety factor method, that is, a power value a is obtained by using the first calculation manner or the second calculation manner, and then, a corresponding calibration power is obtained based on the power value a and the safety factor x.
In a specific implementation, the specific process of step 101 may include: firstly, determining a target performance parameter to be determined, and acquiring a first value and a second value of the target performance parameter; then, the battery cell is kept at a first value, a group of battery cells under the model of the battery cell is tested, a first battery cell data set is obtained, the first battery cell data set is used for representing the condition of the battery cell under the first value, the battery cell is kept at a second value, another group of battery cells under the model of the battery cell is tested, a second battery cell data set is obtained, and the second battery cell data set is used for representing the condition of the battery cell under the second value.
The battery cell group comprises at least one battery cell with the same model. In one case, when a group of cells includes a cell, the data that can characterize the cell condition obtained by the test can be directly used as the cell data set; in another case, when a group of battery cells includes a plurality of battery cells, test data corresponding to each battery cell in the group of battery cells may be obtained through a test, and then, a battery cell data set may be obtained through comprehensive analysis of all the test data, where the battery cell data is used to characterize a comprehensive status of the plurality of battery cells.
It can be understood that the cell data set includes data for characterizing a condition of the cell, and specifically may include at least one of the following data: the data used for representing the service life of the battery cell, the data used for representing the internal resistance change of the battery cell and the data used for representing the power output condition of the battery cell. The data used for characterizing the lifetime of the battery cell may be, for example, the maximum number of cycles of the battery cell, or the total lifetime.
It should be noted that, through step 101, a plurality of possible calibration values are obtained and tested respectively to obtain a condition representing the electrical core under each possible calibration value, so as to provide a data basis for subsequently determining a final reasonable calibration value.
And 102, comparing the first battery cell data set with the second battery cell data set to obtain a comparison result.
It can be understood that the comparison result is used for characterizing whether the operation condition of the battery cell of the type is healthier at the first value or healthier at the second value. The operation condition is healthy, which means that the operation is comprehensive or good in one or more aspects.
In some possible implementations, it is assumed that the cell data set includes: the data used for characterizing the lifetime of the cell, the data used for characterizing the internal resistance change of the cell, and the data used for characterizing the power output condition of the cell, i.e., the first cell data set includes data a1, data b1, and data c1, and the second cell data set includes data a2, data b2, and data c 2.
As an example, data d1 capable of reflecting the health condition of the cell may be obtained based on data a1, data b1 and data c1, data d2 capable of reflecting the health condition of the cell may be obtained based on data a2, data b2 and data c2, and then the sizes of d1 and d2 are compared to obtain a comparison result, where if the value of data d reflecting the health condition of the cell is larger, the cell is more healthy, and then when d1> d2, the comparison result may be determined to be d 1.
As another example, it is also possible to obtain a cell data set with a larger number of data items reflecting a healthier condition or a larger weighted value as a comparison result by respectively comparing the data items. Assuming that the larger data value represents the healthier cell, in one case, the larger data may be determined to be a1 based on the data a1 and a2, the larger data may be determined to be b2 based on the data b1 and b2, and the larger data may be determined to be c1 based on the data c1 and c2, then it may be determined that the healthier data items in the first cell data set are more, that is, the comparison result may be determined as: the first cell data set reflects a healthier cell condition. In another case, the larger data may be determined to be a1 based on data a1 and a2, b2 based on data b1 and b2, and c1 based on data c1 and c 2; wherein, the weight of the data items corresponding to the data a1 and a2 is 0.1, the weight of the data items corresponding to the data b1 and b2 is 0.6, and the weight of the data items corresponding to the data c1 and c2 is 0.3, then, it may be determined that the weighted value of the first cell data set is 1 × 0.1+1 × 0.3 — 0.4, and the weighted value of the second cell data set is 1 × 0.6 — 0.6, that is, it may be determined that the weighted value representing the cell condition in the second cell data set is larger, and it may be determined that the comparison result is: the second cell data set reflects a healthier cell condition.
It should be noted that, when the cell data set includes any two data of data used for characterizing the lifetime of the cell, data used for characterizing the internal resistance change of the cell, and data used for characterizing the power output condition of the cell, the manner of obtaining the comparison result may be referred to in the description in the above example, and is not described again here.
In other possible implementations, when the cell data set only includes any one of data representing the lifetime of the cell, data representing the internal resistance change of the cell, and data representing the power output condition of the cell, the comparison may be performed based on the data.
And 103, determining the calibration value of the target performance parameter as a target value according to the comparison result, wherein the target value is a first value or a second value.
In specific implementation, a value (a first value or a second value) corresponding to the battery cell data set which represents that the battery cell is more healthy in condition in the comparison result is determined as a target value, that is, a calibration value of the target performance parameter of the battery cell of the model.
As an example, if the target performance parameter is the temperature of the battery cell, the second value is greater than the first value by a preset value; then, as shown in fig. 2, the embodiment of the present application may specifically include:
It should be noted that, the related descriptions of step 201 and step 202 may refer to step 101 and step 102, which are not described herein again.
It can be understood that the preset adjustment condition may refer to that the comparison result represents that the cell condition represented by the second cell data set corresponding to the second value is healthier, and at this time, it may be considered that a more appropriate calibration value may be obtained, that is, the floating and the test need to be continued on the basis of the second value. And if the comparison result does not meet the preset adjustment condition, the comparison result may be considered to represent that the embodied cell condition of the second cell data set corresponding to the current second value is declined compared with the first cell data set corresponding to the first value or the second cell data set corresponding to the previous second value, at this time, the test may not be performed, and the value corresponding to the more healthy condition reflected by the corresponding cell data set in the first value and the previous second value is taken as the target value.
Therefore, through a plurality of tests, the data sets reflecting the health conditions of the battery core are compared, and the temperature of the more accurate battery core is determined, so that the user can use the battery core in more reasonable temperature limitation, and the experience of using the battery core by the user is improved.
As another example, if the target performance parameter is the power of the battery cell, as shown in fig. 3, the embodiment of the present application may specifically include:
It should be noted that, the related descriptions of step 303 and step 304 may refer to step 101 and step 102, which are not described herein again.
The first calculation method may be any one of the following calculation methods: calculating power according to voltage and current, calculating power according to voltage and internal resistance, and calculating power according to a safety coefficient method; the second calculation method may specifically be any one of the following calculation methods: the power is calculated from the voltage and the current, the power is calculated from the voltage and the internal resistance, and the power is calculated by a safety factor method, and the second calculation method is a calculation method different from the first calculation method.
So, can obtain a plurality of power numerical values through multiple calculation methods, through the test based on a plurality of power numerical values to the data set of comparative reflection electric core health situation determines the power of more accurate electric core, thereby the user can use this electric core in more reasonable power restriction, has improved the experience that the user used this electric core.
In addition, in this embodiment of the application, in one case, if it is determined that the first value is the target value, after step 305, the method may further include: determining that the first calculation mode is a target calculation mode; calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting a target calculation mode; in another case, if it is determined that the second value is the target value, after step 306, the method may further include: determining a second calculation mode as a target calculation mode; and calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting a target calculation mode. Therefore, on the basis of determining the more reliable and accurate calibration power of the battery cell, the calculation mode for calculating the calibration power can be used as the most effective calculation mode for the calibration power of the battery cell of the model, and the calibration power of the battery cells of other models can be calculated based on the calculation mode, so that the test times and the cost of the battery cells of the same model in the process of calibrating the power of different battery cells are saved, and the accuracy of the calibration power of the battery cells is ensured.
In some possible implementations, based on the embodiment shown in fig. 3, a more reasonable calibration current may also be determined based on the determined calculation formula of the calibration power (hereinafter referred to as "target calculation mode"). In specific implementation, if the target performance parameter is the current of the battery cell, as shown in fig. 4, the embodiment of the present application may further include:
in step 406, if the comparison result indicates that the state of the battery cell at the second value is healthy compared with the state of the battery cell at the first value, it is determined that the second calibration current is the target value.
It should be noted that, the description related to step 403 and step 404 may refer to step 101 and step 102, which are not described herein again.
Therefore, a plurality of power values can be obtained through a plurality of currents in a target calculation mode, through the test based on the plurality of power values, and the data sets reflecting the health conditions of the battery cells are compared, the power of the more accurate battery cells is determined, the currents corresponding to the power of the more accurate battery cells are determined to be the more reasonable calibration currents of the battery cells, and therefore the user can use the battery cells in more reasonable current limitation, and the experience of the user in using the battery cells is improved.
Therefore, by the method for determining the battery cell performance parameters, more accurate battery cell performance parameters can be determined through a multi-dimensional test, and the problem that the battery cell performance parameters determined by the existing inherent single-dimensional test are not appropriate enough is solved, so that the calibration of the performance parameters of the battery cell when the BEV leaves the factory can accurately reflect more reasonable data to a user, and the experience of the user in using the battery cell is improved.
In addition, an embodiment of the present application further provides a device 500 for determining a cell performance parameter, referring to fig. 5, where the device 500 includes:
a testing unit 501, configured to respectively maintain the electric core at a first value and a second value, and test two groups of electric cores under a model to which the electric core belongs, to obtain a first electric core data set and a second electric core data set, where the first electric core data set and the second electric core data set are respectively used to represent conditions of the electric core under the first value and the second value, and the first value and the second value are two values of a target performance parameter on the electric core;
a comparing unit 502, configured to compare the first cell data set and the second cell data set, and obtain a comparison result;
a first determining unit 503, configured to determine, according to the comparison result, that the calibrated value of the target performance parameter is a target value, where the target value is the first value or the second value.
Optionally, the target performance parameter includes a power of the cell, a current of the cell, or a temperature of the cell.
Optionally, if the target performance parameter is the temperature of the battery cell, the second value is greater than the first value by a preset value;
if the comparison result meets the preset adjustment condition, the apparatus 500 further includes:
the updating unit is used for updating the second value, adjusting the second value to be the current second value plus the preset value, returning to execute the steps of respectively keeping the electric core at the first value and the second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set until the comparison result does not meet the adjustment condition;
the first determining unit 503 is specifically configured to:
determining the current second value as a calibration value of the temperature of the first battery cell and other battery cells with the same model as the first battery cell.
Optionally, if the target performance parameter is the power of the battery cell, the apparatus 500 further includes:
the first calculation unit is used for obtaining first power of the battery cell as the first value based on a first calculation mode;
the second calculation unit is configured to obtain, based on a second calculation manner, a second power of the battery cell as the second value;
the first determining unit 503 includes:
a first determining subunit, configured to determine that the first value is the target value if the comparison result indicates that the state of the cell at the first value is more healthy than the state of the cell at the second value;
a second determining subunit, configured to determine that the second value is the target value if the comparison result indicates that the state of the battery cell at the second value is healthy compared with the state of the battery cell at the first value.
Optionally, if it is determined that the first value is the target value, the apparatus 500 further includes:
a second determining unit, configured to determine that the first calculation method is a target calculation method;
the third calculation unit is used for calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting the target calculation mode;
if it is determined that the second value is the target value, the apparatus 500 further includes:
a third determining unit, configured to determine that the second calculation method is a target calculation method;
and the fourth calculating unit is used for calculating the power calibration values of other electric cores under the model of the electric core by adopting the target calculating mode.
Optionally, if the target performance parameter is the current of the battery cell, the apparatus 500 further includes:
a fifth calculating unit, configured to obtain, as the first value, a third power of the battery cell based on the first calibration current and the target calculation manner;
a sixth calculating unit, configured to obtain, based on a second calibration current and the target calculation manner, a fourth power of the battery cell as the second value;
the first determining unit 503 includes:
a third determining subunit, configured to determine that the first calibration current is the target value if the comparison result indicates that the state of the battery cell at the first value is healthy compared with the state of the battery cell at the second value;
a fourth determining subunit, configured to determine that the second calibration current is the target value if the comparison result indicates that the state of the battery cell at the second value is healthy compared with the state of the battery cell at the first value.
Optionally, the cell data set includes at least one of the following data:
the data are used for representing the service life of the battery cell, representing the internal resistance change of the battery cell and representing the power output condition of the battery cell.
The above description is related to the apparatus 500 for determining a cell performance parameter, where specific implementation manners and achieved effects may refer to the description of the embodiment of the method for determining a cell performance parameter shown in fig. 1 to 4, and are not described herein again.
In addition, an embodiment of the present application further provides an apparatus 600, as shown in fig. 6, where the apparatus 600 includes a processor 601 and a memory 602:
the memory 602 is used for storing computer programs;
the processor 601 is configured to execute the method for determining the cell performance parameter in any implementation manner in the embodiment corresponding to fig. 1 to fig. 4 according to the computer program.
In addition, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used to store a computer program, and the computer program is used to execute the method for determining the cell performance parameter in any implementation manner in the embodiment corresponding to fig. 1 to fig. 4.
In the names of "first value", "first cell data set", and the like, the "first" mentioned in the embodiments of the present application is only used for name identification, and does not represent the first in sequence. The same applies to "second" etc.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a general hardware platform. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the apparatus embodiments and the apparatus embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for relevant points. The above-described embodiments of the apparatus and device are merely illustrative, and the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only a preferred embodiment of the present application and is not intended to limit the scope of the present application. It should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the scope of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (16)
1. A method for determining cell performance parameters is characterized by comprising the following steps:
respectively keeping the electric core at a first value and a second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set, wherein the first electric core data set and the second electric core data set are respectively used for representing the conditions of the electric core under the first value and the second value, and the first value and the second value are two values of a target performance parameter on the electric core;
comparing the first cell data set with the second cell data set to obtain a comparison result; the comparison result is used for representing whether the operation condition of the battery cell under the first value is healthier or the operation condition of the battery cell under the second value is healthier;
according to the comparison result, determining that the calibration value of the target performance parameter is a target value, wherein the target value is the first value or the second value; the determining, according to the comparison result, the calibration value of the target performance parameter as a target value specifically includes: and determining a value corresponding to the battery cell data set which represents the more healthy state of the battery cell in the comparison result as a target value.
2. The method of claim 1, wherein the target performance parameter comprises a power of the cell, a current of the cell, or a temperature of the cell.
3. The method of claim 2, wherein if the target performance parameter is the temperature of the cell, the second value is greater than the first value by a preset value;
if the comparison result meets the preset adjustment condition, the method further comprises:
updating the second value, adjusting the second value to be the current second value plus the preset value, returning to execute the step of respectively keeping the electric core at the first value and the second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set until the comparison result does not meet the adjustment condition;
the determining, according to the comparison result, the calibration value of the target performance parameter as a target value specifically includes:
determining the current second value as a calibration value of the temperature of the first battery cell and other battery cells with the same model as the first battery cell.
4. The method of claim 2, wherein if the target performance parameter is the power of the cell, the method further comprises:
obtaining first power of the battery cell as the first value based on a first calculation mode;
obtaining second power of the battery cell as the second value based on a second calculation mode;
the determining the calibration value of the target performance parameter as the target value according to the comparison result includes:
if the comparison result represents that the state of the battery cell under the first value is more healthy than the state of the battery cell under the second value, determining that the first value is the target value;
and if the comparison result represents that the state of the battery cell under the second value is more healthy than the state of the battery cell under the first value, determining that the second value is the target value.
5. The method of claim 4, wherein if it is determined that the first value is the target value, the method further comprises:
determining that the first calculation mode is a target calculation mode;
calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting the target calculation mode;
if it is determined that the second value is the target value, the method further includes:
determining that the second calculation mode is a target calculation mode;
and calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting the target calculation mode.
6. The method of claim 5, wherein if the target performance parameter is the current of the cell, the method further comprises:
obtaining a third power of the battery cell as the first value based on the first calibration current and the target calculation mode;
obtaining a fourth power of the battery cell as the second value based on a second calibration current and the target calculation mode;
the determining the calibration value of the target performance parameter as the target value according to the comparison result includes:
if the comparison result represents that the state of the battery cell under the first value is more healthy than the state of the battery cell under the second value, determining that the first calibration current is the target value;
and if the comparison result represents that the state of the battery cell under the second value is more healthy than the state of the battery cell under the first value, determining that the second calibration current is the target value.
7. The method of any of claims 1 to 6, wherein the cell data set comprises at least one of:
the data are used for representing the service life of the battery cell, representing the internal resistance change of the battery cell and representing the power output condition of the battery cell.
8. An apparatus for determining cell performance parameters, comprising:
the test unit is used for respectively keeping the electric core at a first value and a second value, testing two groups of electric cores under the model number of the electric core, and obtaining a first electric core data set and a second electric core data set, wherein the first electric core data set and the second electric core data set are respectively used for representing the conditions of the electric core under the first value and the second value, and the first value and the second value are two values of a target performance parameter on the electric core;
a comparison unit, configured to compare the first cell data set with the second cell data set, and obtain a comparison result; the comparison result is used for representing whether the operation condition of the battery cell under the first value is healthier or the operation condition of the battery cell under the second value is healthier;
a first determining unit, configured to determine, according to the comparison result, that the calibrated value of the target performance parameter is a target value, where the target value is the first value or the second value; the determining, according to the comparison result, the calibration value of the target performance parameter as a target value specifically includes: and determining a value corresponding to the battery cell data set which represents the more healthy state of the battery cell in the comparison result as a target value.
9. The apparatus of claim 8, wherein the target performance parameter comprises a power of the cell, a current of the cell, or a temperature of the cell.
10. The apparatus of claim 9, wherein if the target performance parameter is a temperature of the cell, the second value is greater than the first value by a preset value;
if the comparison result meets the preset adjustment condition, the device further comprises:
the updating unit is used for updating the second value, adjusting the second value to be the current second value plus the preset value, returning to execute the steps of respectively keeping the electric core at the first value and the second value, testing two groups of electric cores under the model to which the electric core belongs, and obtaining a first electric core data set and a second electric core data set until the comparison result does not meet the adjustment condition;
the first determining unit is specifically configured to:
determining the current second value as a calibration value of the temperature of the first battery cell and other battery cells with the same model as the first battery cell.
11. The apparatus of claim 9, wherein if the target performance parameter is the power of the cell, the apparatus further comprises:
the first calculation unit is used for obtaining first power of the battery cell as the first value based on a first calculation mode;
the second calculation unit is configured to obtain, based on a second calculation manner, a second power of the battery cell as the second value;
the first determination unit includes:
a first determining subunit, configured to determine that the first value is the target value if the comparison result indicates that the state of the cell at the first value is more healthy than the state of the cell at the second value;
a second determining subunit, configured to determine that the second value is the target value if the comparison result indicates that the state of the battery cell at the second value is healthy compared with the state of the battery cell at the first value.
12. The apparatus of claim 11, wherein if the first value is determined to be the target value, the apparatus further comprises:
a second determining unit, configured to determine that the first calculation method is a target calculation method;
the third calculation unit is used for calculating the calibration values of the power of other battery cells under the model of the battery cell by adopting the target calculation mode;
if it is determined that the second value is the target value, the apparatus further includes:
a third determining unit, configured to determine that the second calculation method is a target calculation method;
and the fourth calculating unit is used for calculating the power calibration values of other electric cores under the model of the electric core by adopting the target calculating mode.
13. The apparatus of claim 12, wherein if the target performance parameter is the current of the cell, the apparatus further comprises:
a fifth calculating unit, configured to obtain, as the first value, a third power of the battery cell based on the first calibration current and the target calculation manner;
a sixth calculating unit, configured to obtain, based on a second calibration current and the target calculation manner, a fourth power of the battery cell as the second value;
the first determination unit includes:
a third determining subunit, configured to determine that the first calibration current is the target value if the comparison result indicates that the state of the battery cell at the first value is healthy compared with the state of the battery cell at the second value;
a fourth determining subunit, configured to determine that the second calibration current is the target value if the comparison result indicates that the state of the battery cell at the second value is healthy compared with the state of the battery cell at the first value.
14. The apparatus of any of claims 8 to 13, wherein the cell data set comprises at least one of:
the data are used for representing the service life of the battery cell, representing the internal resistance change of the battery cell and representing the power output condition of the battery cell.
15. An apparatus, comprising a processor and a memory:
the memory is used for storing a computer program;
the processor is configured to perform the method of any one of claims 1 to 7 in accordance with the computer program.
16. A computer-readable storage medium for storing a computer program for performing the method of any one of claims 1 to 7.
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