CN113733980B - Method, apparatus, medium, and electronic device for determining capacity of power battery - Google Patents
Method, apparatus, medium, and electronic device for determining capacity of power battery Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
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Abstract
The present disclosure relates to a method, apparatus, medium, and electronic device for determining power battery capacity. The method comprises the following steps: acquiring charging current corresponding to each charging time of the power battery in the historical charging process; determining current stabilization stages in a historical charging process according to charging currents corresponding to all charging moments, wherein the change value of the charging current does not exceed a preset current change threshold value in a charging time period corresponding to each current stabilization stage; determining a target current stabilization stage from the current stabilization stages; and determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging moment in the target current stable stage. Therefore, data can be screened, a stage in which the data change steadily is screened out, and the capacity of the power battery is determined by using the data in the stage, so that the capacity of the power battery can be determined accurately even in a low-frequency acquisition scene.
Description
Technical Field
The present disclosure relates to the field of vehicles, and in particular, to a method, an apparatus, a medium, and an electronic device for determining a capacity of a power battery.
Background
With the increasing popularity of electric vehicles, the performance and status of batteries become more important as a loop of three batteries. The service life of the battery is an important part in the process of researching and developing the battery core and the power battery pack, and the service life of the battery is also one of indexes for evaluating the quality of the power battery pack. Therefore, the prediction of the capacity of the power battery is the focus of the research of the electric automobile, and the prediction has high significance on the research and development of the battery core. In the related technology, a battery state parameter is generally obtained through online data, the actual accumulated charge-discharge capacity is obtained through methods such as ampere-hour integration and the like, an estimated value is obtained, and then an error between the actual value and the estimated value is corrected to obtain a cell state estimated parameter. However, this method has a high requirement on data accuracy, and is only applicable to a high-frequency acquisition scene, and cannot be applied to low-frequency acquisition data.
Disclosure of Invention
An object of the present disclosure is to provide a method, an apparatus, a medium, and an electronic device for determining power battery capacity to accurately determine power battery capacity.
To achieve the above object, according to a first aspect of the present disclosure, there is provided a method of determining power battery capacity, the method comprising:
acquiring charging current corresponding to each charging time of the power battery in a historical charging process;
determining current stabilization stages in a historical charging process according to charging currents corresponding to all charging moments, wherein the change value of the charging current does not exceed a preset current change threshold value in a charging time period corresponding to each current stabilization stage;
determining a target current stabilization stage from the current stabilization stages;
and determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging moment in the target current stable stage.
Optionally, the determining a target current stationary phase from the current stationary phases includes:
determining the charged electric quantity corresponding to each current stationary stage according to the charging current corresponding to each charging time in each current stationary stage;
and taking the current stable stage corresponding to the charged electric quantity with the maximum electric quantity value as the target current stable stage.
Optionally, the charged amount corresponding to the current plateau is determined by:
wherein Ah (k) is a charged amount at the kth charging time of the current plateau, t (k) is a starting charging time of the current plateau, t (k + 1) is an ending charging time of the current plateau, and I (k) is a charging current at the t (k).
Optionally, the determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging time in the target current plateau stage includes:
determining a target charging SOC corresponding to a charging voltage at a target charging time according to a corresponding relation between a preset voltage and the SOC, wherein the target charging time is one of charging times in a stable stage of the target current;
determining a target charged electric quantity corresponding to the target charging time;
and determining the capacity of the power battery according to the initial SOC, the target charging SOC and the target charged electric quantity of the power battery in the historical charging process.
Optionally, the capacity of the power battery is determined by:
performing ith iteration calculation through the following formula to obtain the battery capacity Ah _ cell (i) corresponding to the ith iteration:
Ah_cell(i)＝Ah_cell(i-1)+k(i)*ε(i)
wherein, ah _ cell (i-1) is the battery capacity obtained by the i-1 st calculation, k (i) is a gain coefficient corresponding to the i-th iteration, and epsilon (i) is an estimation error corresponding to the i-th iteration;
and when the i reaches a preset number of times, or when the battery capacity corresponding to the ith iteration is converged, determining the battery capacity corresponding to the ith iteration as the capacity of the power battery.
Optionally, the gain factor k (i) is determined by the following formula:
wherein, P (i-1) is an iterative calculation coefficient corresponding to the target charging time, λ is a forgetting factor, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
Optionally, the estimation error ε (i) is determined by the following equation:
ε(i)＝Ah(i)-Ah_cell(i-1)*x(i)
wherein Ah (i) is the target charged amount, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
According to a second aspect of the present disclosure, there is provided an apparatus for determining power battery capacity, the apparatus comprising:
the acquisition module is used for acquiring charging current corresponding to each charging moment of the power battery in the historical charging process;
the first determining module is used for determining current stabilization stages in a historical charging process according to charging currents corresponding to charging moments, wherein in a charging time period corresponding to each current stabilization stage, a change value of the charging current does not exceed a preset current change threshold value;
the second determining module is used for determining a target current stabilization stage from the current stabilization stages;
and the third determining module is used for determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging moment in the target current stable stage.
Optionally, the second determining module includes:
the first determining submodule is used for determining the charged electric quantity corresponding to each current stationary stage according to the charging current corresponding to each charging time in each current stationary stage;
and the second determining submodule is used for taking the current stable stage corresponding to the charged electric quantity with the maximum electric quantity value as the target current stable stage.
Optionally, the first determining submodule is configured to determine a charged capacity corresponding to a current plateau stage by:
wherein Ah (k) is the charged amount at the kth charging time of the current plateau, t (k) is the initial charging time of the current plateau, t (k + 1) is the end charging time of the current plateau, and I (k) is the charging current at t (k).
Optionally, the third determining module includes:
a third determining submodule, configured to determine, according to a preset correspondence between a voltage and an SOC, a target charging SOC corresponding to a charging voltage at a target charging time, where the target charging time is one of charging times in a target current stabilization phase;
a fourth determining submodule, configured to determine a target charged electric quantity corresponding to the target charging time;
and the fifth determining submodule is used for determining the capacity of the power battery according to the initial SOC, the target charging SOC and the target charged electric quantity of the power battery in the historical charging process.
Optionally, the fifth determination submodule is configured to determine the capacity of the power battery by:
performing ith iteration calculation through the following formula to obtain the battery capacity Ah _ cell (i) corresponding to the ith iteration:
Ah_cell(i)＝Ah_cell(i-1)+k(i)*ε(i)
wherein, ah _ cell (i-1) is the battery capacity obtained by the i-1 st calculation, k (i) is a gain coefficient corresponding to the i-th iteration, and epsilon (i) is an estimation error corresponding to the i-th iteration;
and when i reaches a preset number of times, or when the battery capacity corresponding to the ith iteration converges, determining the battery capacity corresponding to the ith iteration as the capacity of the power battery.
Optionally, the gain factor k (i) is determined by the following formula:
wherein, P (i-1) is an iterative calculation coefficient corresponding to the target charging time, λ is a forgetting factor, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
Optionally, the estimation error ε (i) is determined by the following equation:
ε(i)＝Ah(i)-Ah_cell(i-1)*x(i)
wherein Ah (i) is the target charged amount, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
According to a third aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect of the present disclosure.
According to a fourth aspect of the present disclosure, there is provided an electronic device comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of the first aspect of the disclosure.
By the technical scheme, the charging current corresponding to each charging moment of the power battery in the historical charging process is obtained; determining current stabilization stages in the historical charging process according to the charging current corresponding to each charging moment, wherein the change value of the charging current does not exceed a preset current change threshold value in the charging time period corresponding to each current stabilization stage; determining a target current stabilization stage from the current stabilization stages; and determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging moment in the target current stable stage. Therefore, data can be screened, the stage of stable change of the data is screened out, and the capacity of the power battery is determined by using the data in the stage, so that the capacity of the power battery can be determined more accurately even in a low-frequency acquisition scene.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart of a method of determining power battery capacity provided in accordance with one embodiment of the present disclosure;
FIG. 2 is an exemplary flow chart of the steps for determining a target current plateau from the current plateaus in a method of determining power battery capacity according to the present disclosure;
FIG. 3 is an exemplary flowchart of the steps for determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging time in the target current plateau phase in the method for determining the capacity of the power battery according to the present disclosure;
FIG. 4 is a block diagram of an apparatus for determining power battery capacity provided in accordance with one embodiment of the present disclosure.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before introducing aspects of the present disclosure, an application background of the present disclosure will be explained first. As described in the background, prediction of power battery capacity is of great significance.
There are many methods for estimating the capacity of a battery, such as an open circuit voltage method, an ampere-hour integration method, and a neural network method. Since the static voltage is difficult to obtain in a real vehicle and the SOC estimation is susceptible to temperature, the open-circuit voltage method is not suitable for the capacity estimation of the vehicle power battery. The ampere-hour integration method has extremely high requirements on equipment precision and SOC estimation precision. The neural network law requires a large number of samples to perform the calculations and is not realistic.
In the whole vehicle running process, data collected by a BMS (Battery Management System) can be uploaded to a whole vehicle cloud platform through a T-box, due to the limitation of equipment, high-frequency data uploading cannot be achieved on the data collected by some BMSs, and after the data is processed by the BMS, the high-frequency data at short time intervals are changed into low-frequency data at long time intervals and then the low-frequency data are uploaded to the cloud platform. The current capacity prediction algorithm has high requirements on data precision and cannot be used for battery capacity prediction in a low-frequency acquisition scene.
In order to solve the above problems, the present disclosure provides a method, an apparatus, a medium, and an electronic device for determining a capacity of a power battery, so as to accurately determine the capacity of the power battery, especially in a low-frequency data acquisition scenario.
Fig. 1 is a flow chart of a method of determining power battery capacity provided according to an embodiment of the present disclosure, which may include the following steps, as shown in fig. 1.
In step 11, the charging current corresponding to each charging time of the power battery in the historical charging process is obtained.
Here, the history charging process corresponds to one history charging process. If data of a plurality of historical charging processes exist, each historical charging process can be processed by referring to a processing method of one historical charging process.
The battery management system BMS of the vehicle may collect data related to the battery and may upload it to a cloud platform connected to the vehicle. The battery related data may include: current, voltage, SOC, time (e.g., charge start time, charge end time, etc.), state of charge (e.g., start charge, end charge). The BMS may periodically collect the data and determine the current, voltage, SOC, and state of charge corresponding to each collection time, and the collection time may correspond to the charging time in step 11 during the charging process of the power battery.
For example, the charging current corresponding to each charging time in the historical charging process can be directly obtained by the BMS of the host vehicle. For another example, the charging current corresponding to each charging time in the historical charging process may be obtained by a cloud platform connected to the host vehicle.
In addition, since a certain precondition is required for determining the battery capacity, that is, data of any charging process can not be used for predicting the battery capacity, a certain degree of screening is also required to screen out a historical charging process which can be used for determining the flux of the power battery, and the power battery capacity is determined based on the data of the historical charging process. Therefore, the historical charging process needs to satisfy a most basic condition that the difference between the SOC at the end of charging and the SOC at the start of charging in the historical charging process should be larger than a preset charging capacity (which can be set according to an empirical value), so that the data can be used for determining the battery capacity, and if not, even if the data is used, the determined power battery capacity is inaccurate and has no reference meaning. Therefore, based on a plurality of charging processes, the SOC (SOC 1) corresponding to the beginning of each charging process can be obtained, the SOC (SOC 2) corresponding to the end of each charging process can be obtained, and when (SOC 2-SOC 1) is larger than the preset charging capacity, the charging process can be taken as a historical charging process.
In step 12, a current stabilization phase in the historical charging process is determined according to the charging current corresponding to each charging time.
And in the charging time interval corresponding to each current stable stage, the change value of the charging current does not exceed a preset current change threshold value.
For example, the starting time of the historical charging process may be used as a time starting point, the currents may be acquired one by one according to the advance of time, the difference value of the charging current of each charging time relative to the time starting point may be calculated in real time, and when it is calculated that the current difference value exceeds a preset difference threshold value at a certain charging time, the period from the time starting point to the charging time may be used as a current plateau stage. Subsequently, the determination of other current plateau phases in the historical charging process may be continued in the manner described above, with this charging time as a time starting point.
For another example, based on the above example, a minimum duration for the current plateau may also be specified. That is, the determined current plateau period needs to be long enough on the premise that the requirement of current value plateau is satisfied. For example, if the preset minimum time period is 1s, if the current is stabilized between 0.05s to 1s, the period cannot be regarded as the current stabilization phase in consideration of the insufficient time period. Therefore, the duration of the current stationary phase can be ensured, and the current stationary phase is ensured to have enough data volume for determining the capacity of the power battery.
In step 13, a target current plateau is determined from the current plateaus.
In one possible embodiment, step 13 may include the following steps, as shown in fig. 2:
in step 21, determining the charged electric quantity corresponding to each current stabilization stage according to the charging current corresponding to each charging time in each current stabilization stage;
in step 22, the current plateau corresponding to the charged quantity having the largest quantity value is set as the target current plateau.
For example, the charged amount corresponding to the current plateau may be determined by:
the charging method comprises the following steps of charging a battery, wherein Ah (k) is the charged electric quantity at the kth charging time in a current stable stage, t (k) is the initial charging time in the current stable stage, t (k + 1) is the end charging time in the current stable stage, I (k) is the charging current at the t (k), and k is a positive integer greater than or equal to 1.
Therefore, the charged electric quantity corresponding to each current stable stage in the historical charging process can be determined, and the current stable stage corresponding to the largest charged electric quantity can be used as the target current stable stage. Therefore, the capacity of the power battery is determined by utilizing the stable stage of the target current with the maximum electric quantity change, the data is richer, and a more accurate calculation result is convenient to obtain.
In addition, since certain preconditions are required for determining the battery capacity, that is, data of any current plateau stage may not be used for predicting the battery capacity, some basic conditions need to be satisfied in the target current plateau stage. For example, the voltage of the target current plateau should include the lowest voltage (which may be set based on empirical values) and the highest voltage (which may be set based on empirical values) required to determine the current plateau. As another example, the charged amount corresponding to the target current plateau should be greater than the minimum charged capacity required to predict the battery capacity. For example, before step 21 is executed, a certain degree of screening may be performed according to the above conditions to screen out candidate current smoothing stages, and a target current smoothing stage may be selected from the candidate current smoothing stages based on steps 21 and 22. For another example, the step 21 and the step 22 may be performed with a screening process, for example, when finding out the maximum charged capacity, only the maximum charged capacity in the current plateau stage meeting the voltage requirement is taken out in combination with the requirements of the maximum voltage and the minimum voltage, and the found maximum charged capacity should be larger than the minimum capacity to be charged for predicting the battery capacity.
In step 14, the capacity of the power battery is determined according to the charging current and the charging voltage corresponding to each charging time in the target current plateau stage.
In one possible embodiment, step 14 may include the following steps, as shown in FIG. 3.
In step 31, a target charging SOC corresponding to the charging voltage at the target charging time is determined according to a preset correspondence between the voltage and the SOC.
Wherein the target charging time is one of the charging times in the target current plateau phase.
In step 32, the target charged amount corresponding to the target charging timing is determined.
The manner of determining the charged amount corresponding to a certain charging timing has been given in the description of step 21, and with reference to the above manner, the target charged amount corresponding to the target charging timing can be determined.
In step 33, the capacity of the power battery is determined according to the initial SOC, the target charging SOC and the target charged capacity of the power battery in the historical charging process.
In one possible embodiment, the capacity of the power battery can be determined by using a least square method with a forgetting factor. In this embodiment, step 33 may determine the capacity of the power battery by:
performing ith iteration calculation through the following formula to obtain the battery capacity Ah _ cell (i) corresponding to the ith iteration:
Ah_cell(i)＝Ah_cell(i-1)+k(i)*ε(i)
wherein, ah _ cell (i-1) is the battery capacity obtained by the i-1 st calculation, k (i) is a gain coefficient corresponding to the i-th iteration, epsilon (i) is an estimation error corresponding to the i-th iteration, and i is a positive integer greater than or equal to 1.
And when the i reaches the preset times, or when the battery capacity corresponding to the ith iteration converges, determining the battery capacity corresponding to the ith iteration as the capacity of the power battery.
For example, the gain factor k (i) may be determined by the following equation:
and P (i-1) is an iterative calculation coefficient corresponding to the target charging time, and lambda is a forgetting factor. Initially, the iterative computation coefficient P may be an identity matrix.
For example, the estimation error ε (i) may be determined by the following equation:
ε(i)＝Ah(i)-Ah_cell(i-1)*x(i)
where Ah (i) is the target charged amount.
Also, x (i) used in calculating k (i) and ∈ (i) can be determined by the following formula:
x(i)＝SOC(i)-SOC(a)
where SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
By the technical scheme, the charging current corresponding to each charging moment of the power battery in the historical charging process is obtained; determining current stabilization stages in the historical charging process according to the charging current corresponding to each charging moment, wherein the change value of the charging current does not exceed a preset current change threshold value in the charging time period corresponding to each current stabilization stage; determining a target current stabilization stage from the current stabilization stages; and determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging moment in the target current stable stage. Therefore, data can be screened, the stage of stable change of the data is screened out, and the capacity of the power battery is determined by using the data in the stage, so that the capacity of the power battery can be determined more accurately even in a low-frequency acquisition scene.
FIG. 4 is a block diagram of an apparatus for determining power battery capacity provided in accordance with one embodiment of the present disclosure. As shown in fig. 4, the apparatus 40 may include:
the obtaining module 41 is configured to obtain a charging current corresponding to each charging time of the power battery in a historical charging process;
the first determining module 42 is configured to determine current stabilization stages in a historical charging process according to charging currents corresponding to charging times, where a change value of the charging current does not exceed a preset current change threshold in a charging period corresponding to each current stabilization stage;
a second determining module 43, configured to determine a target current stationary phase from the current stationary phases;
and a third determining module 44, configured to determine the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging time in the target current stabilization phase.
Optionally, the second determining module 43 includes:
the first determining submodule is used for determining the charged electric quantity corresponding to each current stationary stage according to the charging current corresponding to each charging time in each current stationary stage;
and the second determining submodule is used for taking the current stable stage corresponding to the charged electric quantity with the maximum electric quantity value as the target current stable stage.
Optionally, the first determining submodule is configured to determine a charged capacity corresponding to a current plateau stage by:
wherein Ah (k) is the charged amount at the kth charging time of the current plateau, t (k) is the initial charging time of the current plateau, t (k + 1) is the end charging time of the current plateau, and I (k) is the charging current at t (k).
Optionally, the third determining module 44 includes:
a third determining submodule, configured to determine, according to a preset correspondence between a voltage and an SOC, a target charging SOC corresponding to a charging voltage at a target charging time, where the target charging time is one of charging times in a target current stabilization phase;
a fourth determining submodule, configured to determine a target charged electric quantity corresponding to the target charging time;
and the fifth determining submodule is used for determining the capacity of the power battery according to the initial SOC, the target charging SOC and the target charged electric quantity of the power battery in the historical charging process.
Optionally, the fifth determining submodule is configured to determine the capacity of the power battery by:
performing ith iteration calculation through the following formula to obtain the battery capacity Ah _ cell (i) corresponding to the ith iteration:
Ah_cell(i)＝Ah_cell(i-1)+k(i)*ε(i)
wherein, ah _ cell (i-1) is the battery capacity obtained by the i-1 st calculation, k (i) is a gain coefficient corresponding to the i-th iteration, and epsilon (i) is an estimation error corresponding to the i-th iteration;
and when the i reaches a preset number of times, or when the battery capacity corresponding to the ith iteration is converged, determining the battery capacity corresponding to the ith iteration as the capacity of the power battery.
Optionally, the gain factor k (i) is determined by the following formula:
wherein, P (i-1) is an iterative calculation coefficient corresponding to the target charging time, λ is a forgetting factor, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
Optionally, the estimation error ε (i) is determined by the following equation:
ε(i)＝Ah(i)-Ah_cell(i-1)*x(i)
wherein Ah (i) is the target charged amount, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of determining power battery capacity according to any of the embodiments of the present disclosure.
The present disclosure also provides an electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to perform the steps of the method of determining power battery capacity of any embodiment of the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (9)
1. A method of determining power battery capacity, the method comprising:
acquiring charging current corresponding to each charging time of the power battery in the historical charging process;
determining current stabilization stages in a historical charging process according to charging currents corresponding to all charging moments, wherein the change value of the charging current does not exceed a preset current change threshold value in a charging time period corresponding to each current stabilization stage;
determining a target current stabilization stage from the current stabilization stages;
determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging moment in the target current stable stage;
the determining a target current plateau phase from the current plateau phases includes:
determining the charged electric quantity corresponding to each current stationary stage according to the charging current corresponding to each charging time in each current stationary stage;
and taking the current stable stage corresponding to the charged electric quantity with the largest electric quantity value as the target current stable stage.
2. The method of claim 1, wherein the amount of charged power corresponding to the current plateau is determined by:
wherein Ah (k) is the charged amount at the kth charging time of the current plateau, t (k) is the initial charging time of the current plateau, t (k + 1) is the end charging time of the current plateau, and I (k) is the charging current at t (k).
3. The method of claim 1, wherein determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging time in the target current plateau stage comprises:
determining a target charging SOC corresponding to a charging voltage at a target charging time according to a corresponding relation between a preset voltage and the SOC, wherein the target charging time is one of charging times in a stable stage of the target current;
determining a target charged electric quantity corresponding to the target charging time;
and determining the capacity of the power battery according to the initial SOC, the target charging SOC and the target charged electric quantity of the power battery in the historical charging process.
4. The method of claim 3, wherein the capacity of the power cell is determined by:
performing ith iteration calculation through the following formula to obtain the battery capacity Ah _ cell (i) corresponding to the ith iteration:
Ah_cell(i)＝Ah_cell(i-1)+k(i)*ε(i)
wherein, ah _ cell (i-1) is the battery capacity obtained by the i-1 st calculation, k (i) is a gain coefficient corresponding to the i-th iteration, and epsilon (i) is an estimation error corresponding to the i-th iteration;
and when i reaches a preset number of times, or when the battery capacity corresponding to the ith iteration converges, determining the battery capacity corresponding to the ith iteration as the capacity of the power battery.
5. The method according to claim 4, characterized in that the gain factor k (i) is determined by the following formula:
wherein, P (i-1) is an iterative calculation coefficient corresponding to the target charging time, λ is a forgetting factor, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
6. The method of claim 4, wherein the estimation error ε (i) is determined by the following equation:
ε(i)＝Ah(i)-Ah_cell(i-1)*x(i)
wherein Ah (i) is the target charged amount, and x (i) is determined by the following formula:
x(i)＝SOC(i)-SOC(a)
wherein SOC (i) is the target charging SOC and SOC (a) is the initial SOC.
7. An apparatus for determining power battery capacity, the apparatus comprising:
the acquisition module is used for acquiring the charging current corresponding to each charging moment of the power battery in the historical charging process;
the first determining module is used for determining current stabilization stages in the historical charging process according to charging currents corresponding to charging moments, wherein in a charging time period corresponding to each current stabilization stage, the change value of the charging current does not exceed a preset current change threshold value;
the second determining module is used for determining a target current stable stage from the current stable stages;
the third determining module is used for determining the capacity of the power battery according to the charging current and the charging voltage corresponding to each charging moment in the target current stable stage;
the second determining module includes:
the first determining submodule is used for determining the charged electric quantity corresponding to each current stationary stage according to the charging current corresponding to each charging time in each current stationary stage;
and the second determining submodule is used for taking the current stable stage corresponding to the charged electric quantity with the maximum electric quantity value as the target current stable stage.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
9. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1-6.
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