CN114264964B - Method, device, equipment and medium for evaluating battery capacity - Google Patents
Method, device, equipment and medium for evaluating battery capacity Download PDFInfo
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Abstract
The application provides a battery capacity assessment method, a device, equipment and a medium, wherein the method comprises the following steps: acquiring test data of a plurality of battery cells of a target battery module when the target battery module is subjected to a cyclic test; selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the charge state of the target battery module; determining each sub-capacity included in the battery cell to be evaluated in a state of charge using range of the target battery module based on comparative analysis of reference test data of a reference battery cell and test data to be evaluated of the battery cell to be evaluated in test data of the battery cells; and determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated. The battery cells to be evaluated are evaluated according to different battery cells in the target battery module, so that the more real overall capacity of the battery cells to be evaluated can be obtained.
Description
Technical Field
The present application relates to the field of battery capacity assessment technologies, and in particular, to a method, an apparatus, a device, and a medium for battery capacity assessment.
Background
With the popularization of new energy electric vehicles, battery manufacturers pay more and more attention to the performance of the battery core, particularly the service life of the battery, which is directly related to the purchase intention of consumers. In the process of developing batteries, the service life of the batteries is often obtained according to a battery test standard manual or an enterprise battery test standard manual and the service life characteristic of the batteries is obtained according to the test result. The battery is composed of components, and the life of the battery is also determined by the components.
The module of the battery pack generally needs to undergo various safety and performance verification before leaving the factory, the cycle life of the module is generally performance test according to the requirements of customers, and the general test condition is that the cycle test of 1C/1C (Charge current multiplying power/discharge current multiplying power) is carried out under the normal temperature of 25 ℃ in a whole vehicle use SOC (State of Charge) window (the use range from the lowest SOC to the highest SOC). The number of cycles is determined by factors such as the module process, BMS (battery management system) balancing strategy, and the capacity fade characteristics of the battery cells. For a module with excessively fast capacity decay in the circulation process, cause analysis, especially single-cell capacity analysis, is needed, but since the module cannot be disassembled after being assembled, how to accurately estimate the capacity of each cell in the module becomes a technical problem.
Disclosure of Invention
Accordingly, the present application aims to provide a method, an apparatus, a device and a medium for evaluating battery capacity, wherein the method, the device and the medium only need to perform a cyclic test on a target battery module to obtain test data required by the method, the operation procedure is simple, the test resources are saved, and the method, the device and the medium can evaluate the battery cells to be evaluated according to different battery cells in the target battery module to obtain the more real overall capacity of the battery cells to be evaluated.
In a first aspect, an embodiment of the present application provides a method for evaluating a battery capacity, the method including:
acquiring test data of a plurality of battery cells included in a target battery module when the target battery module is subjected to a cyclic test;
selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the state of charge of the target battery module;
determining each sub-capacity included in the battery cell to be evaluated within the state of charge using range of the target battery module based on the comparative analysis of the reference test data of the reference battery cell and the test data to be evaluated of the battery cell to be evaluated in the test data of the battery cells;
And determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module.
In some embodiments of the present application, the different sub-capacities of the to-be-evaluated battery cell include: underfilling sub-capacity, discharging sub-capacity, and unreleasing sub-capacity;
the reference cell includes: when the target battery module starts to discharge, a first reference cell with the highest voltage in the target battery module and a second reference cell with the lowest voltage in the target battery module are discharged.
In some embodiments of the present application, the determining, based on the comparative analysis of the reference test data of the reference cell and the to-be-evaluated test data of the to-be-evaluated cell in the test data of the plurality of cells, each sub-capacity included in the to-be-evaluated cell within the state of charge usage range of the target battery module includes:
according to the to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the discharge sub-capacity of the to-be-evaluated battery cell;
according to the comparison analysis of the first reference test data of the first reference battery cell and the to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the underfilling sub-capacity of the to-be-evaluated battery cell;
And according to the comparison analysis of the reference test data of the second reference cell and the test data to be evaluated of the cell to be evaluated, calculating to obtain the unreleased sub-capacity of the cell to be evaluated.
In some embodiments of the present application, the determining, based on the comparative analysis of the reference test data of the reference cell and the to-be-evaluated test data of the to-be-evaluated cell in the test data of the plurality of cells, each sub-capacity included in the to-be-evaluated cell within the state of charge usage range of the target battery module includes:
calculating and analyzing the reference test data of the reference battery cell, and establishing a reference association relation of the reference capacitor of the reference battery cell in the discharging process;
calculating and analyzing the to-be-evaluated test data of the to-be-evaluated battery cell, and establishing a target association relation of the sub-capacity of the to-be-evaluated battery cell in the discharging process;
and comparing and analyzing the reference association relationship and the target association relationship, and determining each sub-capacity of the battery cell to be evaluated in the use range of the charge state of the target battery module.
In some embodiments of the present application, the comparing and analyzing the reference association relationship and the target association relationship to determine each sub-capacity of the to-be-evaluated battery cell within a state of charge usage range of the target battery module includes:
Adjusting the reference association relation according to the adjustment parameters so as to enable the adjusted reference association relation to be matched with the target association relation;
determining a segmentation value of the reference incidence relation and the target incidence relation by comparing the adjusted reference incidence relation and the target incidence relation;
and determining each sub-capacity of the battery cell to be evaluated in the state of charge using range of the target battery module according to the segmentation value and the target association relation.
In some embodiments of the present application, the adjustment parameters include a target translation parameter and a target scaling parameter; the adjusting the reference association relation according to the adjustment parameter so as to match the adjusted reference association relation with the target association relation comprises the following steps:
translating the reference association relation according to the target translation parameter to obtain the translated reference association relation;
and scaling the translated reference association relation according to the target scaling parameter to obtain the reference association relation matched with the target association relation.
In some embodiments of the present application, the target translation parameter and the target scaling parameter are obtained by:
Taking the translation parameter and the scaling parameter as optimization variables, and establishing an error function;
solving the target translation parameter and the target scaling parameter by using the following algorithm to solve the error minimum value of the error function; wherein, the solving process of the algorithm comprises the following steps:
initializing a population, and randomly generating individuals of the initial population; the initial population individuals correspond to a gene string, and the gene string is formed by coding translation parameters and scaling parameters;
screening target initial population individuals with the best fitness from the initial population individuals; copying, crossing and forming a new generation group of individuals in the target initial population, taking the new generation group as a new initial population of individuals, and returning to the step of screening out the target initial population of individuals with the best fitness from the initial population of individuals until the preset condition is met, so as to obtain the optimal target initial population of individuals; and the translation parameters and the scaling parameters corresponding to the individuals of the optimal target initial population are the target translation parameters and the target scaling parameters.
In a second aspect, an embodiment of the present application provides an apparatus for battery capacity assessment, the apparatus including:
The acquisition module is used for acquiring test data of a plurality of battery cells included in the target battery module when the target battery module performs a cyclic test;
the selecting module is used for selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the charge state of the target battery module;
the comparison analysis module is used for determining each sub-capacity included in the battery cell to be evaluated in the state of charge using range of the target battery module based on comparison analysis of the reference test data of the reference battery cell and the test data to be evaluated of the battery cell to be evaluated in the test data of the battery cells;
and the determining module is used for determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module.
In a third aspect, an embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for battery capacity assessment described above when the processor executes the computer program.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of battery capacity assessment described above.
The technical scheme provided by the embodiment of the application can comprise the following beneficial effects:
according to the application, when the target battery module carries out a cyclic test, the test data of a plurality of battery cells included in the target battery module are obtained; selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the charge state of the target battery module; determining each sub-capacity included in the battery cell to be evaluated in a state of charge using range of the target battery module based on comparative analysis of reference test data of a reference battery cell and test data to be evaluated of the battery cell to be evaluated in test data of the battery cells; and determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module. According to the application, the target battery module is only required to be subjected to the cyclic test, the required test data can be obtained, the operation procedure is concise, the test resources are saved, and the battery to be evaluated is evaluated according to different battery cores in the target battery module, so that the more real overall capacity of the battery to be evaluated can be obtained.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for evaluating battery capacity according to an embodiment of the present application;
FIG. 2 is a schematic diagram showing calculation of different sub-capacities of a cell to be evaluated according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a battery capacity assessment apparatus according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device 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 technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for the purpose of illustration and description only and are not intended to limit the scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
In addition, the described embodiments are only some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that the term "comprising" will be used in embodiments of the application to indicate the presence of the features stated hereafter, but not to exclude the addition of other features.
With the popularization of new energy electric vehicles, battery manufacturers pay more and more attention to the performance of the battery core, particularly the service life of the battery, which is directly related to the purchase intention of consumers. In the process of developing batteries, the service life of the batteries is often obtained according to a battery test standard manual or an enterprise battery test standard manual and the service life characteristic of the batteries is obtained according to the test result. The battery is composed of components, and the life of the battery is also determined by the components.
The module of the battery pack generally needs to be subjected to various safety and performance verification before leaving the factory, the cycle life of the module is generally performance test according to the requirements of customers, the general test condition is that the cycle test of 1C/1C (charge current multiplying power/discharge current multiplying power) is carried out in a SOC (StateofCharge) window (the lowest SOC to the highest SOC application range) of the whole vehicle at the normal temperature of 25 ℃. The number of cycles is determined by factors such as the module process, BMS (battery system) equalization strategy, and the capacity fade characteristics of the cells. For a module with excessively fast capacity decay in the circulation process, cause analysis, especially single-cell capacity analysis, is needed, but since the module cannot be disassembled after being assembled, how to accurately estimate the capacity of each cell in the module becomes a technical problem.
A method for rapidly evaluating capacity of a lithium ion battery module in the prior art is realized by constructing the lithium ion battery moduleThe method comprises the steps of acquiring a relation model of the charge states SOC (StateofCharge) and open-circuit voltages OCV (Open circuit voltage) of single batteries, and acquiring voltage data before discharging to obtain the charge state SOCSx of each single battery before discharging and the charge state SOCex of each single battery after discharging; using discharge capacity C during discharge bt 、SOC Sx SOC (System on chip) ex Thereby obtaining the capacity of the lithium ion battery module.
In the prior art, the SOC state before and after the current discharge of the battery is queried by using the SOC and OCV of the battery, and the capacity of the battery is estimated by using the discharge capacity during the discharge. The method has the defects that the battery data under static state is utilized to evaluate the SOC state of the battery cells under dynamic state, and the corresponding relation between the SOC and the OCV of a single battery is utilized, so that the inconsistency of each battery cell in the module is not considered, and the estimation of the capacity of the battery cells is inaccurate.
The embodiment of the application provides a method, a device, equipment and a medium for evaluating battery capacity, and the method, the device, the equipment and the medium are described below through the embodiment.
Fig. 1 is a flowchart of a method for evaluating battery capacity according to an embodiment of the present application, where the method includes steps S101 to S104; specific:
s101, acquiring test data of a plurality of battery cells included in a target battery module when the target battery module is subjected to a cyclic test;
s102, selecting a to-be-evaluated battery cell from a plurality of battery cells included in a target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the charge state of the target battery module;
S103, determining each sub-capacity included in the battery cell to be evaluated in the state of charge using range of the target battery module based on the comparison analysis of the reference test data of the reference battery cell and the test data to be evaluated of the battery cell to be evaluated in the test data of the battery cells;
and S104, determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module.
According to the application, the target battery module is only required to be subjected to the cyclic test, the required test data can be obtained, the operation procedure is concise, the test resources are saved, and the battery to be evaluated is evaluated according to different battery cores in the target battery module, so that the more real overall capacity of the battery to be evaluated can be obtained.
Some embodiments of the application are described in detail below. The following embodiments and features of the embodiments may be combined with each other without conflict.
S101, acquiring test data of a plurality of battery cells included in a target battery module when the target battery module is subjected to a cycle test.
The cell is the minimum unit of the power battery and is also the electrical energy storage unit. When a plurality of battery cells are packaged together by the same housing frame and are connected with the outside through uniform boundaries, a battery module is formed.
The application combines the testing procedure, and the target battery module obtains the testing data of each of a plurality of battery cells included in the target battery module when the target battery module carries out the cyclic test. The test data comprise working data of the target battery module in different test states during each circle of test; the test states include a charge state, a discharge state, and a rest state; the working data comprise charging current, discharging current, temperature and single voltage of each electric core of the target battery module.
S102, selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the charge state of the target battery module.
After the test data of each cell in the target battery module is obtained, one cell to be evaluated, which needs to be evaluated, is selected from a plurality of cells included in the target battery module. The method comprises the steps of dividing the overall capacity of the battery cell to be evaluated in the state of charge using range of the target battery module into different stages, and dividing the overall capacity of the battery cell to be evaluated into different sub-capacities in the state of charge using range of the target battery module for convenience in calculation. The sub-capacities herein include an underfilled sub-capacity, a discharged sub-capacity, and an unreleased sub-capacity. According to the application, the overall capacity of the battery cell to be evaluated is determined by calculating different sub-capacities of the battery cell to be evaluated.
When the application calculates different sub-capacities of the battery cells to be evaluated, different reference battery cells need to be selected for the sub-capacities. The reference cell herein includes: when the target battery module begins to discharge, the first reference cell with the highest voltage in the target battery module and the second reference cell with the lowest voltage in the target battery module are discharged. For example, the first reference cell is numbered p and the second reference cell is numbered q.
S103, determining each sub-capacity included in the battery cells to be evaluated in the state of charge using range of the target battery module based on the comparison analysis of the reference test data of the reference battery cells and the test data to be evaluated of the battery cells to be evaluated in the test data of the battery cells.
According to the application, the reference data of the reference battery cell and the to-be-evaluated data of the to-be-evaluated battery cell are subjected to comparative analysis, so that each sub-capacity included in the to-be-evaluated battery cell can be determined. In the embodiment of the application shown in fig. 2, when calculating different sub-capacities of the to-be-evaluated battery cells, a first reference battery cell and a second reference battery cell are selected, and the calculation of the different sub-capacities of the to-be-evaluated battery cells is as follows:
s201, calculating to obtain the discharge capacity of the battery cell to be evaluated according to the test data to be evaluated of the battery cell to be evaluated;
S202, according to comparison analysis of first reference test data of a first reference battery cell and to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the underfilling sub-capacity of the to-be-evaluated battery cell;
s203, according to the comparison analysis of the reference test data of the second reference battery cell and the test data to be evaluated of the battery cell to be evaluated, calculating to obtain the unreleased sub-capacity of the battery cell to be evaluated.
In the embodiment of the present application, as an optional embodiment, the reference number of the to-be-evaluated battery cell in the target battery module is a, and the discharge sub-capacity of the to-be-evaluated battery cell a may be calculated according to the time and the discharge current included in the to-be-evaluated data of the to-be-evaluated battery cell a. The specific calculation formula is as follows:
wherein I is the current in the discharge process, t is the discharge time in the discharge process, Q dch And the discharge capacity of the battery cell a to be evaluated in the current cycle number of the target battery module is obtained.
For the cell p, the discharge capacity from the start of discharge to the end of discharge was calculated:
t (n) is the end discharge time, Q p，dch (i) For the accumulated discharge capacity at the corresponding discharge time t (i), the voltage of the battery cell p is recorded as follows:
V p (i),i＝1,2,...,n
for the cell q, the discharge capacity in the process from the start of discharge to the end of discharge was calculated.
t (n) is the end discharge time, Q q，dch (i) For the accumulated discharge capacity at the corresponding discharge time t (i), the voltage of the battery cell q is recorded as follows:
V q (i),i＝1,2,...,n。
after the discharge sub-capacity of the to-be-evaluated battery cell is obtained by calculating the to-be-evaluated test data and the reference capacitance of the reference battery cell in the discharge process is obtained by calculating the reference test data, the underfilling sub-capacity and the unreleased sub-capacity of the to-be-evaluated battery cell also need to be calculated.
When calculating the underfilling sub-capacity and the unreleased sub-capacity of the to-be-evaluated battery cell, the target association relation of the sub-capacity of the to-be-evaluated battery cell in the discharging process is needed. The target association relationship here characterizes the change relationship between the reference data to be evaluated of the cells to be evaluated in the discharging process. For example, a change relation between the discharge sub-capacity of the battery cell to be evaluated, which is calculated from the data to be evaluated, and the voltage to be evaluated included in the data to be evaluated may be established. In practice, a target curve representation of the discharge sub-capacity of the cell to be evaluated versus the voltage to be evaluated may be used.
For underfill sub-capacity: according to the application, the underfill sub-capacity of the battery cell to be evaluated is calculated according to the comparison analysis of the first reference test data of the first reference battery cell and the to-be-evaluated test data of the battery cell to be evaluated. Before the comparative analysis, the present application needs to establish a first reference association relationship with respect to a first reference capacitance of a first reference cell in a first reference cell discharging process. For example, a first association of a first reference capacitance of a first reference cell with a first reference voltage of the cell during discharge may be established. In implementations, a first reference curve representation of the first reference capacitance and the first reference voltage may be used.
In the following, we take a relation curve as an example to describe, after the above-mentioned target curve and the first reference curve are established, the underfill sub-capacity of the target cell to be evaluated can be determined by comparing the target curve with the first reference curve. In comparison, in order to improve the comparison efficiency, the application selects partial curves at corresponding positions from the target curve and the first reference curve for comparison. The specific comparison process is as follows: and placing the target curve and the first reference curve in the same coordinate system, and matching the target curve by the first reference curve in a translation and scaling mode, namely, overlapping the first reference curve with the target curve by the translation and scaling mode. When the first reference curve is coincident with the target curve, a division point of the target curve and the first reference curve can be determined, and the coordinate of the division point is a division value. The dividing value is represented by a first reference capacitor and a first reference voltage, and the difference value between the capacity of the battery cell to be evaluated and the capacity of the first reference battery cell can be determined through the dividing value, wherein the difference value is the underfilling sub-capacity of the battery cell to be evaluated.
For unreleased sub-capacity: according to the application, the unreleased sub-capacity of the battery cell to be evaluated is calculated according to the comparison analysis of the second reference test data of the second reference battery cell and the to-be-evaluated test data of the battery cell to be evaluated. Before the comparative analysis, the present application needs to establish a second reference association relationship with respect to a second reference capacitance of a second reference cell during the discharging process of the second reference cell. For example, a second association of a second reference capacitance of a second reference cell with a second reference voltage of the cell during discharge may be established. In implementations, a second reference curve representation of the second reference capacitance and the second reference voltage may be used.
In the following, we take a relation curve as an example to describe, after the above-mentioned target curve and the second reference curve are established, the unreleased sub-capacity of the target cell to be evaluated can be determined by comparing the target curve with the second reference curve. In comparison, in order to improve the comparison efficiency, the application selects partial curves at corresponding positions from the target curve and the second reference curve for comparison. The specific comparison process is as follows: and placing the target curve and the second reference curve in the same coordinate system, and matching the target curve by the second reference curve in a translation and scaling mode, namely, overlapping the second reference curve with the target curve by the translation and scaling mode. When the second reference curve is coincident with the target curve, a division point of the target curve and the second reference curve can be determined, and the coordinate of the division point is a division value. The dividing value is represented by a second reference capacitor and a second reference voltage, and the difference value between the capacity of the battery cell to be evaluated and the capacity of the second reference battery cell can be determined through the dividing value, wherein the difference value is the unreleased sub-capacity of the battery cell to be evaluated.
In the embodiment of the present application, as an optional embodiment, from the start of the 2/3 discharge time of the target battery module to the end of the discharge, the discharge capacity in the process of calculating the cell a is:
Wherein t1 (1) is the discharge time at the target battery module 2/3, t1 (m) is the end discharge time, Q a，dch (i) The accumulated discharge capacity of the battery cell a corresponding to the discharge time t1 (i) is recorded, and the voltage of the battery cell a is recorded as follows:
V a (i),i＝1,2,...,m
the cell q voltage curve is translated and scaled to match the voltage curve of cell a. Assuming that the translatable discharge capacity is Qr and the scaleable discharge capacity proportionality coefficient is Kr, the translated discharge capacity is obtained according to the discharge capacity and voltage of the battery cell q:
Q q1，dch (i)＝Q q，dch (i)+Q r ，i＝1,2，...，m
according to the linear interpolation method, finding the voltage of the corresponding battery cell under the discharge capacity:
V q1 (i),i＝1,2,...,m
discharge capacity after scaling:
Q q2 ， dch (i)＝K r ·(Q q ， dch (i)-Q q1 ， dch (1))，i＝1,2，...，m
voltage of the corresponding cell at this discharge capacity:
V q2 ＝V q1
by Q q2，dch In abscissa, V q2 Calculating the coordinate Q of the battery cell according to a linear interpolation method by taking the battery cell as the ordinate a，dch Voltage V at fit 。
According to the linear interpolation formula:
in the interpolation formula, x 0 x 1 y 0 y 1 X is the abscissa of the new data, y is the to-be-evaluated value of the new data, which is the abscissa of the known data.
Thus, the capacity Q of the fitting target is obtained a，dch And electricityPressure V a Capacity Q to be matched q2，dch And voltage V fit 。
The above-mentioned translation and scaling are performed based on preset target adjustment parameters (target translation parameters and target scaling parameters). The target translation parameter and the target scaling parameter in the application are determined by the following modes:
Taking the translation parameter and the scaling parameter as optimization variables, and establishing an error function;
solving to obtain a target translation parameter and a target scaling parameter by using the following algorithm with the aim of solving the error minimum value of the error function; the solving process of the algorithm comprises the following steps:
initializing a population, and randomly generating individuals of the initial population; the initial population individuals correspond to a gene string, and the gene string is formed by coding translation parameters and scaling parameters;
screening target initial population individuals with the best fitness from the initial population individuals;
copying, crossing and forming a new generation group of target initial population individuals, taking the new generation group as a new initial population individual, and returning to the step of screening out the target initial population individuals with the best fitness from the initial population individuals until the preset condition is met to obtain the optimal target initial population individuals; the translation parameters and the scaling parameters corresponding to the individuals of the optimal target initial population are target translation parameters and target scaling parameters.
In the embodiment of the present application, as an alternative embodiment, a translational discharge capacity Q is set r And scaled discharge capacity scaling factor K r To optimize the variables to fit the target voltage V a And the voltage V to be matched fit As an error criterion, the error function is:
the target optimization model is y=min (f).
And (3) solving a genetic algorithm: firstly, binary coding is carried out on an initial population by a genetic algorithm, and a final objective solving function is converted into a gene good and bad expression form through a form; and then determining and setting a target fitness function, finding out an individual with the best fitness through initial population preliminary, then intersecting and mutating, continuing selecting the individual with the best fitness and intersecting and mutating operation after several times of population alternation until specific conditions are known to be met, and finally obtaining the approximate optimal solution of the optimization problem. Meanwhile, in order to avoid the problem of solving the problem to be in a local optimal solution condition, the genetic algorithm needs to ensure that the initial population and the evolutionary iteration number meet the general requirements, the maximum iteration number is set to be 100 times, and the population size is set to be 100.
And S104, determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module.
After each sub-capacity (the underfilling sub-capacity, the discharging sub-capacity and the unreleasing sub-capacity) included in the battery cell to be evaluated is obtained through the steps, the underfilling sub-capacity, the discharging sub-capacity and the unreleasing sub-capacity are added, and then the whole capacity of the battery cell to be evaluated can be obtained.
Fig. 3 is a schematic structural diagram of an apparatus for battery capacity assessment according to an embodiment of the present application, where the apparatus includes:
the acquisition module is used for acquiring test data of a plurality of battery cells included in the target battery module when the target battery module performs a cyclic test;
the selecting module is used for selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the charge state of the target battery module;
the comparison analysis module is used for determining each sub-capacity included in the battery cells to be evaluated in the state of charge using range of the target battery module based on comparison analysis of reference test data of the reference battery cells in the test data of the battery cells and the test data to be evaluated of the battery cells to be evaluated;
and the determining module is used for determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module.
Wherein, the different sub-capacities of the battery cell to be evaluated include: underfilling sub-capacity, discharging sub-capacity, and unreleasing sub-capacity;
the reference cell includes: when the target battery module begins to discharge, the first reference cell with the highest voltage in the target battery module and the second reference cell with the lowest voltage in the target battery module are discharged.
The contrast analysis module is also used for: based on the comparative analysis of the reference test data of the reference battery cell and the to-be-evaluated test data of the to-be-evaluated battery cell in the test data of the plurality of battery cells, determining each sub-capacity included in the to-be-evaluated battery cell within the state-of-charge use range of the target battery module, including:
according to the to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the discharge capacity of the to-be-evaluated battery cell;
according to the comparison analysis of the first reference test data of the first reference battery cell and the test data to be evaluated of the battery cell to be evaluated, calculating to obtain the underfilling sub-capacity of the battery cell to be evaluated;
and according to the comparison analysis of the reference test data of the second reference battery cell and the test data to be evaluated of the battery cell to be evaluated, calculating to obtain the unreleased sub-capacity of the battery cell to be evaluated.
Based on the comparative analysis of the reference test data of the reference battery cell and the to-be-evaluated test data of the to-be-evaluated battery cell in the test data of the plurality of battery cells, determining each sub-capacity included in the to-be-evaluated battery cell within the state-of-charge use range of the target battery module, including:
calculating and analyzing reference test data of the reference battery cell, and establishing a reference association relation of reference capacitance of the reference battery cell in the discharging process;
Calculating and analyzing to-be-evaluated test data of the to-be-evaluated battery cell, and establishing a target association relation of sub-capacity of the to-be-evaluated battery cell in the discharging process;
and comparing and analyzing the reference association relationship and the target association relationship, and determining each sub-capacity of the battery cell to be evaluated in the use range of the charge state of the target battery module.
Comparing and analyzing the reference association relationship and the target association relationship, and determining each sub-capacity of the battery cell to be evaluated in the use range of the charge state of the target battery module, wherein the method comprises the following steps:
adjusting the reference association relation according to the adjustment parameters so as to enable the adjusted reference association relation to be matched with the target association relation;
determining a segmentation value of the reference incidence relation and the target incidence relation by comparing the adjusted reference incidence relation and the target incidence relation;
and determining each sub-capacity of the battery cell to be evaluated in the use range of the charge state of the target battery module according to the segmentation value and the target association relation.
The adjustment parameters comprise a target translation parameter and a target scaling parameter; adjusting the reference association according to the adjustment parameter to match the adjusted reference association with the target association, including:
Translating the reference association relation according to the target translation parameter to obtain a translated reference association relation;
and scaling the translated reference association according to the target scaling parameter to obtain a reference association matched with the target association.
The target translation parameter and the target scaling parameter are obtained as follows:
taking the translation parameter and the scaling parameter as optimization variables, and establishing an error function;
solving to obtain a target translation parameter and a target scaling parameter by using the following algorithm with the aim of solving the error minimum value of the error function; the solving process of the algorithm comprises the following steps:
initializing a population, and randomly generating individuals of the initial population; the initial population individuals correspond to a gene string, and the gene string is formed by coding translation parameters and scaling parameters;
screening target initial population individuals with the best fitness from the initial population individuals;
copying, crossing and forming a new generation group of target initial population individuals, taking the new generation group as a new initial population individual, and returning to the step of screening out the target initial population individuals with the best fitness from the initial population individuals until the preset condition is met to obtain the optimal target initial population individuals; the translation parameters and the scaling parameters corresponding to the individuals of the optimal target initial population are target translation parameters and target scaling parameters.
As shown in fig. 4, an embodiment of the present application provides an electronic device for performing the method for battery capacity estimation in the present application, where the device includes a memory, a processor, a bus, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for battery capacity estimation when executing the computer program.
In particular, the above-mentioned memory and processor may be general-purpose memory and processor, and are not particularly limited herein, and the above-mentioned method of battery capacity evaluation can be performed when the processor runs a computer program stored in the memory.
Corresponding to the method for battery capacity assessment in the present application, the embodiment of the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor performs the steps of the method for battery capacity assessment described above.
In particular, the storage medium can be a general-purpose storage medium, such as a removable disk, a hard disk, or the like, on which a computer program is executed that is capable of performing the above-described method of battery capacity assessment.
In the embodiments provided herein, it should be understood that the disclosed systems and methods may be implemented in other ways. The system embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical functional division, and there may be additional divisions in actual implementation, and e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, system or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments provided in the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
It should be noted that: like reference numerals and letters in the following figures denote like items, and thus once an item is defined in one figure, no further definition or explanation of it is required in the following figures, and furthermore, the terms "first," "second," "third," etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present application, and are not intended to limit the scope of the present application, but it should be understood by those skilled in the art that the present application is not limited thereto, and that the present application is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the corresponding technical solutions. Are intended to be encompassed within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A method of battery capacity assessment, the method comprising:
acquiring test data of a plurality of battery cells included in a target battery module when the target battery module is subjected to a cyclic test;
selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the state of charge of the target battery module;
Determining each sub-capacity included in the battery cell to be evaluated within the state of charge using range of the target battery module based on the comparative analysis of the reference test data of the reference battery cell and the test data to be evaluated of the battery cell to be evaluated in the test data of the battery cells;
determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module;
the different sub-capacities of the battery cell to be evaluated include: underfilling sub-capacity, discharging sub-capacity, and unreleasing sub-capacity;
the reference cell includes: when the target battery module starts to discharge, a first reference cell with highest voltage in the target battery module and a second reference cell with lowest voltage in the target battery module are discharged;
the determining, based on a comparative analysis of the reference test data of the reference cell and the test data to be evaluated of the battery cells to be evaluated, that each sub-capacity included in the battery cells to be evaluated is within the state of charge usage range of the target battery module includes:
According to the to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the discharge sub-capacity of the to-be-evaluated battery cell;
according to the comparison analysis of the first reference test data of the first reference battery cell and the to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the underfilling sub-capacity of the to-be-evaluated battery cell;
according to the comparison analysis of the reference test data of the second reference cell and the test data to be evaluated of the cell to be evaluated, calculating to obtain the unreleased sub-capacity of the cell to be evaluated;
the determining, based on a comparative analysis of the reference test data of the reference cell and the test data to be evaluated of the battery cells to be evaluated, that each sub-capacity included in the battery cells to be evaluated is within the state of charge usage range of the target battery module includes:
calculating and analyzing the reference test data of the reference battery cell, and establishing a reference association relation of the reference capacitor of the reference battery cell in the discharging process;
calculating and analyzing the to-be-evaluated test data of the to-be-evaluated battery cell, and establishing a target association relation of the sub-capacity of the to-be-evaluated battery cell in the discharging process;
Comparing and analyzing the reference association relationship and the target association relationship, and determining each sub-capacity of the battery cell to be evaluated in the use range of the charge state of the target battery module;
the comparing and analyzing the reference association relationship and the target association relationship, and determining each sub-capacity of the to-be-evaluated battery cell within the use range of the charge state of the target battery module, including:
adjusting the reference association relation according to the adjustment parameters so as to enable the adjusted reference association relation to be matched with the target association relation;
determining a segmentation value of the reference incidence relation and the target incidence relation by comparing the adjusted reference incidence relation and the target incidence relation;
determining each sub-capacity of the battery cell to be evaluated in a state of charge using range of the target battery module according to the segmentation value and the target association relation;
the adjustment parameters comprise a target translation parameter and a target scaling parameter; the adjusting the reference association relation according to the adjustment parameter so as to match the adjusted reference association relation with the target association relation comprises the following steps:
Translating the reference association relation according to the target translation parameter to obtain the translated reference association relation;
and scaling the translated reference association relation according to the target scaling parameter to obtain the reference association relation matched with the target association relation.
2. The method of claim 1, wherein the target translation parameter and the target scaling parameter are obtained by:
taking the translation parameter and the scaling parameter as optimization variables, and establishing an error function;
solving the target translation parameter and the target scaling parameter by using the following algorithm to solve the error minimum value of the error function; wherein, the solving process of the algorithm comprises the following steps:
initializing a population, and randomly generating individuals of the initial population; the initial population individuals correspond to a gene string, and the gene string is formed by coding translation parameters and scaling parameters;
screening target initial population individuals with the best fitness from the initial population individuals;
copying, crossing and forming a new generation group of individuals in the target initial population, taking the new generation group as a new initial population of individuals, and returning to the step of screening out the target initial population of individuals with the best fitness from the initial population of individuals until the preset condition is met, so as to obtain the optimal target initial population of individuals; and the translation parameters and the scaling parameters corresponding to the individuals of the optimal target initial population are the target translation parameters and the target scaling parameters.
3. An apparatus for battery capacity assessment, the apparatus comprising:
the acquisition module is used for acquiring test data of a plurality of battery cells included in the target battery module when the target battery module performs a cyclic test;
the selecting module is used for selecting a to-be-evaluated battery cell from a plurality of battery cells included in the target battery module and a reference battery cell used for evaluating different sub-capacities included in the to-be-evaluated battery cell within the use range of the charge state of the target battery module;
the comparison analysis module is used for determining each sub-capacity included in the battery cell to be evaluated in the state of charge using range of the target battery module based on comparison analysis of the reference test data of the reference battery cell and the test data to be evaluated of the battery cell to be evaluated in the test data of the battery cells;
the determining module is used for determining the overall capacity of the battery cell to be evaluated according to each sub-capacity included in the battery cell to be evaluated in the use range of the charge state of the target battery module;
the different sub-capacities of the battery cell to be evaluated include: underfilling sub-capacity, discharging sub-capacity, and unreleasing sub-capacity;
The reference cell includes: when the target battery module starts to discharge, a first reference cell with highest voltage in the target battery module and a second reference cell with lowest voltage in the target battery module are discharged;
the comparison analysis module is used for determining that each sub-capacity included in the battery cell to be evaluated is within the state of charge using range of the target battery module based on comparison analysis of the reference test data of the reference battery cell and the test data to be evaluated of the battery cell to be evaluated in the test data of the battery cells, and comprises:
according to the to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the discharge sub-capacity of the to-be-evaluated battery cell;
according to the comparison analysis of the first reference test data of the first reference battery cell and the to-be-evaluated test data of the to-be-evaluated battery cell, calculating to obtain the underfilling sub-capacity of the to-be-evaluated battery cell;
according to the comparison analysis of the reference test data of the second reference cell and the test data to be evaluated of the cell to be evaluated, calculating to obtain the unreleased sub-capacity of the cell to be evaluated;
The comparison analysis module is used for determining that each sub-capacity included in the battery cell to be evaluated is within the state of charge using range of the target battery module based on comparison analysis of the reference test data of the reference battery cell and the test data to be evaluated of the battery cell to be evaluated in the test data of the battery cells, and comprises:
calculating and analyzing the reference test data of the reference battery cell, and establishing a reference association relation of the reference capacitor of the reference battery cell in the discharging process;
calculating and analyzing the to-be-evaluated test data of the to-be-evaluated battery cell, and establishing a target association relation of the sub-capacity of the to-be-evaluated battery cell in the discharging process;
comparing and analyzing the reference association relationship and the target association relationship, and determining each sub-capacity of the battery cell to be evaluated in the use range of the charge state of the target battery module;
the comparing and analyzing the reference association relationship and the target association relationship, and determining each sub-capacity of the to-be-evaluated battery cell within the use range of the charge state of the target battery module, including:
adjusting the reference association relation according to the adjustment parameters so as to enable the adjusted reference association relation to be matched with the target association relation;
Determining a segmentation value of the reference incidence relation and the target incidence relation by comparing the adjusted reference incidence relation and the target incidence relation;
determining each sub-capacity of the battery cell to be evaluated in a state of charge using range of the target battery module according to the segmentation value and the target association relation;
the adjustment parameters comprise a target translation parameter and a target scaling parameter; the adjusting the reference association relation according to the adjustment parameter so as to match the adjusted reference association relation with the target association relation comprises the following steps:
translating the reference association relation according to the target translation parameter to obtain the translated reference association relation;
and scaling the translated reference association relation according to the target scaling parameter to obtain the reference association relation matched with the target association relation.
4. An electronic device, comprising: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory in communication over the bus when the electronic device is running, the machine-readable instructions when executed by the processor performing the steps of the method of battery capacity assessment according to any one of claims 1 to 2.
5. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the method of battery capacity assessment according to any one of claims 1 to 2.
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