CN112540313B - Method for correcting available capacity of battery, vehicle and medium - Google Patents
Method for correcting available capacity of battery, vehicle and medium Download PDFInfo
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- CN112540313B CN112540313B CN201910893753.2A CN201910893753A CN112540313B CN 112540313 B CN112540313 B CN 112540313B CN 201910893753 A CN201910893753 A CN 201910893753A CN 112540313 B CN112540313 B CN 112540313B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The invention discloses a method for correcting available capacity of a battery, a vehicle and a medium, wherein the method for correcting the available capacity of the battery comprises the following steps: collecting a battery SOC value; judging whether the SOC value of the battery is less than or equal to a first SOC threshold value; if so, obtaining the discharge capacity and the residual capacity of the battery, and performing iterative estimation according to the discharge capacity and the residual capacity to correct the current available capacity of the battery; if not, acquiring historical use parameters of the battery, and correcting the current available capacity of the battery according to the historical use parameters. The method can be applied to the whole charging and discharging process of the battery, and the estimation precision of the available capacity of the battery is improved.
Description
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method of correcting available capacity of a battery, a computer-readable storage medium, and a vehicle.
Background
With the continuous development of science and technology, new energy vehicles, especially pure electric vehicles, are used as a travel tool and slowly enter each family, the performance requirements of users on the vehicles are higher and higher, especially the requirements on comfort, therefore, the vehicles must be required to adapt to different driving requirements, especially, in the use process of the pure electric vehicles, batteries are the most critical components in the electric vehicles, and the performance index most concerned by the users is the endurance mileage. With the continuous use of the battery, the available capacity of the battery slowly attenuates, so that a client is very concerned about the real State of Health (State of Health) of the battery, and the State of Health value of the battery is calculated through a relevant strategy so as to evaluate how much remaining capacity of the battery pack can be effectively utilized, help the client to master the real capacity condition of the battery and ensure the reliable running of a vehicle.
However, the battery has a plateau period in the charging and discharging process, and the error of the estimation of the SOC (State of Charge) of the battery according to the voltage value is large, thereby affecting the calculation of the SOH. In the process of charging and discharging, the battery is affected by three polarizations, namely electrochemical polarization, concentration polarization and ohmic polarization, so that the difference exists between the open-circuit voltage and the actually detected voltage, the difference is not eliminated instantly in the process of stopping charging and discharging, and the time of more than ten minutes, even more than one hour, usually passes, so that the strategy for estimating the SOH of the battery is obstructed. In addition, the recognition degree of the SOC-OCV curve of the battery is extremely low in the range of 30% -100%, namely, the small change of the battery voltage can cause the large change of the SOC, and at the moment, the SOC-OCV curve method cannot be used and is difficult to estimate accurately.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for correcting the available capacity of a battery, which can be applied to the whole charging and discharging process of the battery, and improve the estimation accuracy of the available capacity of the battery.
It is another object of the present invention to provide a computer-readable storage medium.
The invention also aims to provide a vehicle.
In order to solve the above problem, a method for correcting available capacity of a battery according to an embodiment of the first aspect of the present invention includes: collecting a battery SOC value; judging whether the SOC value of the battery is smaller than or equal to a first SOC threshold value; if so, obtaining the discharge capacity and the residual capacity of the battery, and performing iterative estimation according to the discharge capacity and the residual capacity to correct the current available capacity of the battery; if not, acquiring historical use parameters of the battery, and correcting the current available capacity of the battery according to the historical use parameters.
According to the method for correcting the available capacity of the battery, whether the SOC value of the battery is smaller than or equal to the first SOC threshold value or not is judged, and the corresponding available capacity correction strategy of the battery is determined, namely when the SOC value of the battery is lower, the current available capacity of the battery is corrected by adopting the discharge capacity and the residual capacity, when the SOC value of the battery is higher, the current available capacity of the battery is corrected by adopting the historical use parameters.
In some embodiments, before the iteratively estimating according to the discharge capacity and the residual capacity to modify the currently available capacity of the battery, the method further comprises: collecting the temperature of the battery; judging whether the battery temperature is greater than or equal to a temperature threshold value; if yes, correcting the current available capacity of the battery according to the discharge capacity and the residual capacity; if not, the current available capacity of the battery is corrected according to the historical use parameters. Since the actual available capacity of the battery is reduced and the estimation accuracy of the SOC of the battery is reduced under low temperature conditions, the correction strategy for determining the available capacity of the battery according to the temperature of the battery, that is, when the temperature of the battery is high, the current available capacity of the battery is corrected according to the discharge capacity and the residual capacity, so that the estimation accuracy of the available capacity of the battery can be ensured.
In some embodiments, the iteratively estimating based on the discharge capacity and the residual capacity to modify a currently available capacity of the battery includes: determining the SOC threshold range where the battery SOC value is located; determining a correction coefficient according to the SOC threshold range; calculating a capacity deviation value according to the current available capacity, the discharge capacity and the residual capacity of the battery; and correcting the current available capacity of the battery according to the capacity deviation value and the correction coefficient. The available capacity of the battery is estimated in real time according to the change condition of the SOC, the residual capacity and the discharge capacity by adopting an available capacity iterative estimation method, namely the available capacity of the battery obtained by each calculation is iterated to be the current available capacity of the battery so as to achieve the aim of being closer to a true value.
In some embodiments, the iteratively estimating based on the discharge capacity and the residual capacity to modify a currently available capacity of the battery includes: determining that the SOC value of the battery is larger than a second SOC threshold value, and obtaining a first correction coefficient; judging whether the current available capacity of the battery is larger than the sum of the discharge capacity and the residual capacity; if yes, calculating a difference value between the current available capacity of the battery and the sum value to obtain a capacity deviation value, and reducing the current available capacity of the battery according to the capacity deviation value and the first correction coefficient; if not, judging whether the current available capacity of the battery is smaller than the sum of the discharge capacity and the residual capacity, if so, calculating the difference between the sum and the current available capacity of the battery to obtain the capacity deviation value, and increasing the current available capacity of the battery according to the capacity deviation value and the first correction coefficient.
In some embodiments, the iteratively estimating based on the discharge capacity and the residual capacity to modify a currently available capacity of the battery includes: determining that the SOC value of the battery is greater than or equal to zero and less than or equal to a second SOC threshold value, and obtaining a second correction coefficient; judging whether the current available capacity of the battery is larger than the sum of the discharge capacity and the residual capacity; if so, calculating a difference value between the current available capacity of the battery and the sum value to obtain a capacity deviation value, and reducing the current available capacity of the battery according to the capacity deviation value and a second correction coefficient, wherein the second correction coefficient and the SOC value of the battery form an inverse linear relationship; if not, judging whether the current available capacity of the battery is smaller than the sum of the discharge capacity and the residual capacity, if so, calculating the difference between the sum and the current available capacity of the battery to obtain the capacity deviation value, and increasing the current available capacity of the battery according to the capacity deviation value and the second correction coefficient.
In some embodiments, the iteratively estimating according to the discharge capacity and the residual capacity to modify the current available capacity of the battery further includes: calculating a SOC change value of the battery; judging whether the SOC change value exceeds a preset SOC threshold value or not; if yes, the current available capacity of the battery is revised again.
In some embodiments, modifying the current available capacity of the battery based on the historical usage parameters includes: estimating available capacity based on the historical usage parameters to obtain estimated available capacity; calculating a capacity difference between the estimated available capacity and the current available capacity of the battery; judging whether the absolute value of the capacity difference value is larger than a capacity difference threshold value or not; if so, adjusting the current available capacity of the battery, and adjusting the amplitude to be the capacity difference.
In some embodiments, said estimating available capacity from said historical usage parameters to obtain estimated available capacity comprises: calculating the equivalent discharge cycle number of the battery according to the discharge capacity, and obtaining a first SOH value according to the equivalent discharge cycle number of the battery; acquiring time information, calculating the accumulated running time of the battery according to the time information, and acquiring a second SOH value according to the accumulated time of the battery; acquiring the vehicle driving mileage, calculating the total accumulated driving mileage of a battery according to the vehicle driving mileage, and acquiring a third SOH value according to the total accumulated driving mileage of the battery; estimating a battery SOH value based on the first SOH value, the second SOH value, and the third SOH value; and obtaining the estimated available capacity according to the SOH value of the battery. The method comprises the steps of estimating available capacity according to historical use parameters by adopting a battery SOH historical data estimation method, estimating a capacity difference value between the available capacity and the current available capacity of the battery, adjusting and correcting the current available capacity of the battery, namely respectively estimating the SOH value of the battery by combining charge-discharge cycle times, battery accumulated running time and vehicle driving mileage parameters, and selecting an average value of the SOH value as an estimated value of the SOH of the battery, so that the estimation precision of the SOH value of the battery is improved.
The computer readable storage medium of the second aspect of the present invention stores thereon a computer program, which when executed implements the method for correcting the available capacity of a battery according to the above-described embodiments.
A vehicle according to an embodiment of the third aspect of the present invention includes a battery and a battery manager for executing the method of correcting the available capacity of the battery according to the above embodiment.
According to the vehicle provided by the embodiment of the invention, the battery manager executes the method for correcting the available capacity of the battery, so that more accurate available capacity of the battery can be obtained in the whole charging and discharging process of the battery, and the vehicle is prevented from being anchored.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a system according to one embodiment of the invention;
FIG. 2 is a flow chart of a method of correcting available capacity of a battery according to one embodiment of the present invention;
FIG. 3 is a flow chart of modifying battery SOH according to one embodiment of the present invention;
fig. 4 is a flowchart for correcting a currently available capacity of a battery according to a discharge capacity and a remaining capacity according to an embodiment of the present invention;
FIG. 5 is a flow diagram of an iterative available capacity correction SOH, according to one embodiment of the present invention;
FIG. 6 is a flow diagram for modifying a current available capacity of a battery based on historical usage parameters, according to one embodiment of the invention;
FIG. 7 is a flow chart of SOH historical data estimation corrected SOH according to one embodiment of the present invention;
FIG. 8 is a graph of battery fade curves for number of charge and discharge cycles/number of days in service/vehicle mileage, according to one embodiment of the present invention;
FIG. 9 is a flow chart of modifying the currently available capacity in a SOH historical data estimation method according to one embodiment of the present invention;
FIG. 10 is a block diagram of a vehicle according to one embodiment of the invention;
reference numerals:
a vehicle 1000;
a battery 1; a battery manager 2;
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
Fig. 1 is a system block diagram of an embodiment of the present invention, and as shown in fig. 1, a battery manager detects temperature, voltage and current information of a battery in real time and estimates an SOH and an SOC state of the battery according to the temperature, voltage and current information of the battery. The battery is a vehicle-mounted energy storage device and can be charged and discharged.
In the related art, for estimating the SOH of the battery, a method is generally adopted in which the electric quantity of the battery is first discharged to a cut-off voltage, and then the battery is fully charged, so as to calculate the charging capacity of the battery, and the SOH of the battery is obtained by charging capacity/factory nominal capacity. However, this method is more suitable for laboratory measurements and not for normal use of the vehicle, since discharging the vehicle to cutoff, meaning that the battery is exhausted, causes the vehicle to be stranded during operation.
Or when the vehicle is allowed to stand for a long time, estimating the SOC value of the battery by adopting the OCV curve, and estimating the SOH by combining the difference value of the discharged electric quantity and the charged electric quantity. However, in the implementation process of the method, a long time of standing is needed to realize the SOH estimation, and the resolution of the SOC-OCV curve of a partial battery in the interval of 30% -100% is low, such as a lithium iron phosphate battery, which is difficult to estimate accurately.
In order to solve the above problems, a method for correcting the available capacity of a battery according to an embodiment of the first aspect of the present invention, which can be applied to the entire charging and discharging process of the battery, improve the estimation accuracy of the available capacity of the battery, and prevent the vehicle from being dropped, is described below with reference to the accompanying drawings.
Fig. 2 is a flowchart of a method for correcting available battery capacity according to an embodiment of the present invention. As shown in fig. 2, the method for correcting the available capacity of the battery according to the embodiment of the present invention at least includes steps S1-S4.
And step S1, acquiring the SOC value of the battery.
Specifically, the battery manager detects the temperature, voltage and current information of the battery in real time, and estimates the SOC value of the battery according to the temperature, voltage and current information of the battery, for example, an open-circuit voltage method or an ampere-hour integration method or a calculation method combining the two methods may be used to obtain the estimated value of the SOC of the battery, which is not limited herein.
Step S2, determining whether the battery SOC value is less than or equal to the first SOC threshold value, if yes, proceeding to step S3, if no, proceeding to step S4.
Specifically, whether the battery SOC value is smaller than or equal to the first SOC threshold value or not is judged through the battery manager, and since the estimation accuracy of the battery manager is high when the battery SOC is low, a corresponding strategy for correcting the available capacity of the battery can be determined to be adopted according to the range of the SOC value of the battery.
And step S3, obtaining the discharge capacity and the residual capacity of the battery, and performing iterative estimation according to the discharge capacity and the residual capacity to correct the current available capacity of the battery.
Specifically, after the battery manager determines that the SOC value of the battery is smaller than or equal to the first SOC threshold value, the battery manager acquires the discharge capacity and the residual capacity information of the battery, and then the available capacity iterative estimation method is used for estimating the available capacity of the battery according to the change condition of the SOC value and the residual capacity and the current discharge capacity in real time, and the available capacity of the battery obtained by each calculation is replaced by the current available capacity of the battery to realize the correction of the available capacity of the battery, so that the available capacity of the battery is closer to a true value, and the estimation accuracy of the available capacity of the battery is improved.
And step S4, acquiring historical use parameters of the battery, and correcting the current available capacity of the battery according to the historical use parameters.
Specifically, after the battery manager determines that the battery SOC value is larger than the first SOC threshold value, historical use parameters of the battery, such as parameter information of charge-discharge cycle times, running time, mileage parameters and the like of the battery, are obtained according to the battery manager, the SOH values of the battery are respectively estimated according to the obtained historical use parameters of the battery through an SOH historical data estimation method, the average value of the SOH values is selected as an SOH estimated value of the battery, the estimation precision of the SOH values can be improved, and then the available capacity of the battery is corrected through calculation.
According to the method for correcting the available capacity of the battery, whether the SOC value of the battery is smaller than or equal to the first SOC threshold value or not is judged, and the corresponding available capacity correction strategy of the battery is determined, namely when the SOC value of the battery is low, the current available capacity of the battery is corrected by adopting an available capacity iterative estimation method, and when the SOC value of the battery is high, the current available capacity of the battery is corrected by adopting an SOH historical data estimation method.
In some embodiments, the method for correcting the available capacity of the battery according to the embodiments of the present invention further includes: collecting the temperature of the battery; judging whether the temperature of the battery is greater than or equal to a temperature threshold value; if yes, correcting the current available capacity of the battery according to the discharge capacity and the residual capacity; if not, the current available capacity of the battery is corrected according to the historical use parameters.
The method for correcting the available capacity of the battery according to the embodiment of the present invention is illustrated with reference to fig. 3, and the detailed flow is as follows, as shown in fig. 3, wherein the SOC1Is a first SOC threshold value.
S100: the battery is in the discharging process, and S101 is performed.
S101: judging whether the SOC value of the battery is less than or equal to the SOC1. If yes, executing S102; if not, go to S105.
S102: judging whether the battery temperature is more than or equal to T1DEG C. If yes, executing S103; if not, go to S105. E.g. T1The value of (b) may be 20 ℃.
S103: the battery manager enters the available capacity to iteratively modify, and S104 is performed.
S104: and the battery manager corrects the battery SOH according to the current battery available capacity calculated in the iterative available capacity correction process.
S105: the battery manager enters the SOH historical data estimation process.
Since the actual available capacity of the battery is reduced and the estimation accuracy of the SOC of the battery is reduced under the low temperature condition, the correction strategy for determining the available capacity of the battery according to the temperature of the battery, that is, when the temperature of the battery is high, the estimation accuracy of the available capacity of the battery can be ensured by using the iterative estimation method of the available capacity.
The iterative estimation method of available capacity and the estimation method of SOH historical data are further described below.
For the iterative estimation method of the available capacity, as shown in fig. 4, iterative estimation is performed according to the discharge capacity and the remaining capacity to correct the current available capacity of the battery, including at least steps S20-S23.
In step S20, an SOC threshold range in which the battery SOC value is located is determined.
Step S21, determining a correction coefficient according to the SOC threshold range;
step S22, calculating a capacity deviation value according to the current available capacity, the discharge capacity and the residual capacity of the battery;
and step S23, correcting the current available capacity of the battery according to the capacity deviation value and the correction coefficient.
Specifically, in some embodiments, it is determined by the battery manager that the SOC value of the battery is greater than the second SOC threshold value and less than or equal to the first SOC threshold value, and the first correction coefficient is obtained, wherein when the SOC value is in this range, the SOC estimation accuracy is high, and therefore, the SOC estimation accuracy can be used to estimate the currently available capacity of the battery at this stage. Further, whether the current available capacity of the battery is larger than the sum value of the discharge capacity and the residual capacity is judged through the battery manager. If so, calculating a difference value between the current available capacity of the battery and the sum value to obtain a capacity deviation value, and reducing the current available capacity of the battery according to the capacity deviation value and the first correction coefficient; and if not, calculating a difference value between the sum value and the current available capacity of the battery to obtain a capacity deviation value, so that the current available capacity of the battery is increased according to the capacity deviation value and the first correction coefficient.
Or, determining that the SOC value of the battery is greater than or equal to zero and less than or equal to a second SOC threshold value through the battery manager, and obtaining a second correction coefficient, wherein when the SOC is in the range, the battery manager can accurately estimate the current available capacity of the battery. Further, whether the current available capacity of the battery is larger than the sum value of the discharge capacity and the residual capacity is judged through the battery manager. If so, calculating a difference value between the current available capacity of the battery and the sum value to obtain a capacity deviation value, and reducing the current available capacity of the battery according to the capacity deviation value and a second correction coefficient, wherein the second correction coefficient and the SOC value of the battery form an inverse linear relation; and if not, calculating the difference value between the sum value and the current available capacity of the battery to obtain a capacity deviation value, so that the current available capacity of the battery is increased according to the capacity deviation value and the second correction coefficient.
Further, in some embodiments, iterative estimation is performed according to the discharge capacity and the remaining capacity to correct the current available capacity of the battery, and the method further includes calculating an SOC change value of the battery according to the corrected available capacity of the battery, and further determining whether the SOC change value exceeds a preset SOC threshold, and if so, re-correcting the current available capacity of the battery to make a calculation result closer to an actual value, and improving estimation accuracy of the available capacity of the battery.
According to the embodiment of the invention, the current available capacity of the battery is corrected through the discharge capacity and the residual capacity, namely, the available capacity iterative estimation algorithm is adopted, the available capacity of the battery is estimated according to the change condition of the SOC value in real time and according to the residual capacity and the current discharge capacity, and when the SOC value changes, the available capacity of the battery calculated this time is iterated to be the available capacity of the current battery, so that the calculation result is closer to the true value, and meanwhile, the lower the SOC discharge depth is, the higher the correction coefficient is, the current available capacity of the battery can gradually approach to the true value, the battery has the self-adaptive characteristic, and the estimation precision of the available capacity of the battery is improved.
The iterative estimation method of the available capacity is illustrated below with reference to fig. 5, as shown in fig. 5, the detailed flow is as follows, where C is the current available capacity of the battery; c1The difference value of the discharge capacity and the charge capacity from full charge to the moment is the pure discharge capacity; c2The residual capacity of the battery, C, estimated by the battery manager at that time2＝C*SOC；SOC1Is a first SOC threshold value, SOC2Is the second SOC threshold.
S01: the battery manager enters an available capacity iterative correction flow.
S02: judging whether the current SOC of the battery meets the SOC2＜SOC≤SOC1. If yes, go to S04; if not, S03 is executed. Wherein, SOC1May be 30%, SOC2May be 10%.
S03: judging whether the current SOC of the battery meets the condition that the SOC is more than or equal to 0 and less than or equal to SOC2. If yes, go to S06; if not, S07 is executed.
S04: judging whether the current satisfies C > C1+C2And (4) conditions. If yes, the current available capacity of the battery is higher, downward correction is needed, and S041 is executed; if not, S05 is executed.
S041: the battery manager calculates the estimated capacity deviation value delta C, where delta C is equal to C- (C)1+C2) I.e., the difference between the sum of the current discharge capacity and the remaining capacity and the current available capacity of the battery is calculated, S042 is performed.
S042: the battery manager calculates the corrected available capacity C of the battery according to the estimated capacity deviation value3，C3＝C-K1Δ C, perform S08. Wherein K1To correct the coefficient, K1The value of (b) may be 1%. And taking 1% of the estimated capacity deviation value deltaC as a current capacity correction value to correct the current available capacity of the battery.
S05: judging whether C is less than C currently1+C2And (4) conditions. If yes, the current available capacity of the battery is low, upward correction is needed, and S051 is executed; if not, S04 is executed.
S051: the battery manager calculates the estimated capacity deviation value delta C, where delta C is equal to C1+C2C, i.e., calculating the difference between the sum of the current discharge capacity and the remaining capacity and the current available capacity of the battery, S052 is performed.
S052: the battery manager calculates the corrected available capacity C of the battery according to the estimated capacity deviation value3，C3＝C+K1Δ C, perform S08.
S06: judging whether C is satisfied or not1+C2And (4) conditions. If yes, the current available capacity of the battery is higher, downward correction is needed, and S061 is executed; if not, S07 is executed.
S061: electric powerThe pool manager calculates the estimated capacity deviation value delta C, where delta C is equal to C- (C)1+C2) I.e., the difference between the sum of the current discharge capacity and the remaining capacity and the current available capacity of the battery is calculated, S062 is performed.
S062: the battery manager calculates the corrected available capacity C of the battery according to the estimated capacity deviation value3，C3＝C-K2Δ C, wherein K2For correction factors, i.e. K for the estimated capacity deviation Δ C2The current available capacity of the battery is corrected by using the current capacity correction value, and S08 is executed. Wherein, K2(1-0.05 SOC), when SOC is 0, i.e. the battery discharge is cut off, C3Directly taking the estimated capacity deviation Delta C as a capacity correction value to correct the current available capacity of the battery; when SOC is 10%, then C31-0.5 × Δ C, namely, 0.5 times the estimated capacity deviation Δ C is used as a capacity correction value to correct the current available capacity of the battery, and the correction coefficient K is set as the SOC is lower2The larger the value is, the larger the current capacity correction value is, and the closer the current available capacity of the battery is to the true value.
S07: the battery manager judges whether C is less than C1+C2And (4) conditions. If yes, the current available capacity of the battery is low, upward correction is needed, and S071 is executed; if not, S06 is executed.
S071: the battery manager calculates the estimated capacity deviation value delta C, where delta C is equal to C1+C2C, i.e., calculating the difference between the sum of the current discharge capacity and the remaining capacity and the current available capacity of the battery, S072 is performed.
S072: the battery manager calculates the corrected available capacity C of the battery according to the estimated capacity deviation value3，C3＝C+K2Δ C, perform S08.
S08: correcting the current available capacity of the battery to C3That is, when C is equal to C3And S09 is executed.
S09: correcting SOH based on current available capacity4，SOH4＝C/C0. Wherein, C0For battery delivery rating, SOH4S10 is performed for the state of SOH of the battery estimated according to the available capacity iterative estimation method.
S10: it is determined whether the SOC variation value exceeds 1%, and if yes, the process proceeds to step S01, and if no, the process continues to wait.
When the SOC changes by 1% after the battery manager enters the available capacity iterative correction process, the iterative estimation process is re-entered, so that the available capacity of the battery is gradually close to the true value, the estimation precision of the current available capacity of the battery is improved, meanwhile, when the battery is discharged to a state with a low SOC, the capacity correction coefficient is gradually increased, the correction amplitude is gradually increased, the current available capacity of the battery can quickly approach the true value, and the risk of vehicle anchor caused by SOC estimation errors is avoided.
For the SOH historical data estimation method, as shown in fig. 6, the current available capacity of the battery is modified according to the historical use parameters, including at least steps S30-S33.
At step S30, the available capacity is estimated based on the historical usage parameters to obtain an estimated available capacity.
In step S31, a capacity difference between the estimated available capacity and the current available capacity of the battery is calculated.
In step S32, it is determined whether the absolute value of the capacity difference value is greater than the capacity difference threshold value.
In step S33, if yes, the current available capacity of the battery is adjusted, and the adjustment range is the capacity difference.
Specifically, in an embodiment, the historical usage parameters may include parameters such as a battery cycle number, a running time, and a total running mileage data, and further, the battery discharge capacity information is acquired, the equivalent battery discharge cycle number is calculated according to the discharge capacity, the first SOH value is acquired according to the equivalent battery discharge cycle number, the time information is acquired, the accumulated battery running time is calculated according to the time information, the second SOH value is acquired according to the accumulated battery running time, the vehicle running mileage is acquired, the accumulated total battery running mileage is calculated according to the vehicle running mileage, and the third SOH value is acquired according to the accumulated total battery running mileage, so that an average value of the first SOH value, the second SOH value, and the third SOH value is selected as an estimated value of the battery SOH to acquire the estimated available capacity. And then, the battery manager calculates the capacity difference between the estimated available capacity and the current available capacity of the battery according to the obtained estimated available capacity, judges whether the absolute value of the capacity difference is larger than a capacity difference threshold value, if not, does not modify the current available capacity of the battery, if so, adjusts the current available capacity of the battery, and the adjustment amplitude is the capacity difference value so as to modify the available capacity of the battery.
According to the embodiment of the invention, the current available capacity of the battery is corrected through the historical use parameters, namely, an SOH historical data estimation algorithm is adopted, the SOH of the battery is respectively estimated by combining the charge-discharge cycle number, the battery running time and the driving mileage parameters, the average value of the SOH is selected as the estimated value of the SOH of the power battery to obtain the estimated available capacity, and whether the absolute value of the absolute value is greater than a capacity difference threshold value is judged according to the capacity difference value of the obtained estimated available capacity and the current available capacity of the battery to realize the correction of the available capacity of the battery, so that the estimation precision of the available capacity of the battery can be improved.
The SOH history data estimation method is illustrated below with reference to fig. 7, and as shown in fig. 7, the detailed flow is as follows.
S11, the battery manager enters a history data estimation process.
S12, the battery manager obtains the battery discharge capacity information and records the discharge capacity C in each discharge processFAnd S120 is executed.
S120: according to the discharge capacity of the battery, calculating the equivalent discharge cycle number of the battery and the discharge cycle number N of the single batteryF＝CFC, cumulative number of discharge cycles NZS121 is performed as the sum of the number of discharge cycles per discharge process.
S121: SOH estimation in combination with cumulative cycle number decay curve1，SOH1The accumulated cycle number decay curve for the SOH state of the battery estimated by the cycle number is obtained through experimental tests on the charge and discharge cycles of the battery, as shown in fig. 8, which is a graph showing the cell decay of the charge and discharge cycle number of the embodiment of the present invention, and S15 is performed.
S13: time information is acquired, and S130 is performed.
S130: calculating equivalent operation time of the battery according to the time informationIn between, S131 is executed. For example, the cumulative operating time T of the battery is 1 day of operationZIncrease for 1 day.
S131: estimating SOH in conjunction with battery usage time decay curve2，SOH2The accumulated battery age decay curve is obtained by performing an operation condition simulation experiment test on the battery for the state of SOH of the battery estimated from the battery age, as shown in fig. 8, which is a graph of the battery decay curve for the number of operation days of the embodiment of the present invention, and S15 is performed.
S14: and acquiring the vehicle mileage information and executing S140.
S140: and calculating the equivalent accumulated running mileage of the battery according to the running mileage information of the vehicle, and executing S141. For example, the battery accumulated operating mileage S is calculated every 100km of the vehicleZThe increase is 100 km.
S141: estimating SOH in combination with battery mileage decay curve3，SOH3In order to estimate the SOH state of the battery by the battery mileage, the accumulated battery mileage decay curve is obtained by performing an operation condition simulation experiment test on the battery, and as shown in fig. 8, a battery decay curve graph of the vehicle mileage according to the embodiment of the present invention is performed, and S15 is performed.
S15: according to SOH1、SOH2And SOH3The average of the three estimated values is taken as the current SOH estimated value of the battery, and S16 is executed.
S16: estimating the actual available capacity of the battery according to the SOH value, and estimating the available capacity C by the batteryG＝SOH*C0And S17 is executed.
S17: and judging whether the current condition of triggering the available capacity iterative correction is met. If yes, go to S18; if not, S11 is executed.
S18: adding SOH1、SOH2And SOH3Three values are corrected to SOH4I.e. SOH1＝SOH2＝SOH3＝SOH4And S19 is executed.
S19: correcting SOH1、SOH2And SOH3After three values, the corresponding cumulative discharge cycle number NZAnd the accumulated operation time T of the batteryZBattery cellCalculating the operating mileage SZThe specific correction value can be corrected by referring to the corresponding value of the SOH value in fig. 8, so as to ensure the accuracy of the historical data estimation.
Further, when the battery manager is in the SOH historical data estimation process, the detailed process of the battery manager performing real-time correction estimation on the estimated capacity and the current available capacity of the battery during the operation of the battery is shown in fig. 9, where C is0For the battery's outgoing rated capacity, CGTo estimate available capacity, C is the current available battery capacity, CG＝SOH*C0。
S110: the battery manager is in the SOH history data estimation flow, and S111 is executed.
S111: the battery manager determines the estimated available capacity and the current available capacity of the battery, and executes S112.
S112: judging whether the estimated available capacity is smaller than the current available capacity, namely judging whether C is satisfiedG< C. If yes, go to S114; if not, S113 is executed.
S113: judging whether the estimated available capacity is larger than the current available capacity, namely judging whether C is satisfiedGIs > C. If yes, go to S117; if not, S111 is executed.
S114: and judging whether the difference value between the estimated capacity and the current borrowed capacity is larger than 0.5 percent of the current available capacity. If yes, go to S115; if not, go to S116.
S115: the current available capacity is corrected down by 0.5%, and S110 is performed.
S116: the current available capacity is not corrected and S110 is performed.
S117: and judging whether the difference value between the estimated capacity and the current borrowed capacity is larger than 0.5 percent of the current available capacity. If yes, go to S118; if not, go to S116.
S118: the currently available capacity is corrected upward by 0.5%, and S110 is performed.
Specifically, when the deviation of the estimated available capacity and the current available capacity is detected to exceed 0.5%, the battery manager corrects the current available capacity by 0.5%, so that the current available capacity of the battery can be corrected in real time according to the result of the SOH estimation of the battery, and meanwhile, because the capacity value corrected each time is in a small range, the process of correcting the capacity is a gradual process, the influence of capacity fading on the vehicle running is reduced, a driver can gradually adapt to the process, and the phenomenon that the driver is scared due to the capacity fading is avoided.
In summary, according to the method for correcting the available capacity of the battery in the embodiment of the present invention, a corresponding correction strategy for the available capacity of the battery is determined by determining whether the SOC value of the battery is less than or equal to the first SOC threshold, that is, when the SOC value of the battery is high, an SOH historical data estimation algorithm is used, the SOH values of the battery are respectively estimated by combining the number of charge-discharge cycles, the battery running time and the mileage parameter, and the average value of the SOH values is selected as the SOH estimated value of the battery, so as to improve the accuracy of SOH estimation of the battery; when the SOC value of the battery is low, the available capacity iterative estimation method is adopted to estimate the available capacity of the battery in real time according to the change condition of the SOC value, the residual capacity and the discharge capacity, and the available capacity of the battery obtained by each calculation is iterated to be the current available capacity of the battery, so that the calculation result is closer to the true value, the estimation precision of the available capacity of the battery is improved, and the method has self-adaptability, can be suitable for the whole charging and discharging process of the battery, and avoids the condition of vehicle anchorage.
An embodiment of the second aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program is executed to implement the method for correcting the available capacity of a battery according to the above embodiment.
An embodiment of the third aspect of the present invention provides a vehicle, as shown in fig. 10, the vehicle 1000 including a battery 1 and a battery manager 2.
The battery manager 2 is configured to execute the method for correcting the available battery capacity according to the above embodiment.
According to the vehicle 1000 of the embodiment of the invention, the battery manager 2 executes the method for correcting the available capacity of the battery of the above embodiment, so that more accurate available capacity of the battery can be obtained, and the vehicle is prevented from being broken down.
In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A method of modifying available capacity of a battery, the method comprising:
collecting a battery SOC value;
judging whether the SOC value of the battery is smaller than or equal to a first SOC threshold value;
if so, obtaining the discharge capacity and the residual capacity of the battery, and performing iterative estimation according to the discharge capacity and the residual capacity to correct the current available capacity of the battery;
if not, acquiring historical use parameters of the battery, and correcting the current available capacity of the battery according to the historical use parameters;
wherein, the iteratively estimating according to the discharge capacity and the residual capacity to correct the current available capacity of the battery comprises:
determining the SOC threshold range where the battery SOC value is located;
determining a correction coefficient according to the SOC threshold range;
calculating a capacity deviation value according to the current available capacity, the discharge capacity and the residual capacity of the battery;
and correcting the current available capacity of the battery according to the capacity deviation value and the correction coefficient.
2. The method of claim 1, wherein before the iteratively estimating based on the discharge capacity and the residual capacity to correct the currently available capacity of the battery, the method further comprises:
collecting the temperature of the battery;
judging whether the battery temperature is greater than or equal to a temperature threshold value;
if yes, correcting the current available capacity of the battery according to the discharge capacity and the residual capacity;
if not, the current available capacity of the battery is corrected according to the historical use parameters.
3. The method for modifying the available capacity of the battery according to claim 1, wherein the iteratively estimating according to the discharge capacity and the residual capacity to modify the current available capacity of the battery comprises:
determining that the SOC value of the battery is larger than a second SOC threshold value, and obtaining a first correction coefficient;
judging whether the current available capacity of the battery is larger than the sum of the discharge capacity and the residual capacity;
if yes, calculating a difference value between the current available capacity of the battery and the sum value to obtain a capacity deviation value, and reducing the current available capacity of the battery according to the capacity deviation value and the first correction coefficient;
if not, judging whether the current available capacity of the battery is smaller than the sum of the discharge capacity and the residual capacity, if so, calculating the difference between the sum and the current available capacity of the battery to obtain the capacity deviation value, and increasing the current available capacity of the battery according to the capacity deviation value and the first correction coefficient.
4. The method for modifying the available capacity of the battery according to claim 1, wherein the iteratively estimating according to the discharge capacity and the residual capacity to modify the current available capacity of the battery comprises:
determining that the SOC value of the battery is greater than or equal to zero and less than or equal to a second SOC threshold value, and obtaining a second correction coefficient;
judging whether the current available capacity of the battery is larger than the sum of the discharge capacity and the residual capacity;
if so, calculating a difference value between the current available capacity of the battery and the sum value to obtain a capacity deviation value, and reducing the current available capacity of the battery according to the capacity deviation value and a second correction coefficient, wherein the second correction coefficient and the SOC value of the battery form an inverse linear relationship;
if not, judging whether the current available capacity of the battery is smaller than the sum of the discharge capacity and the residual capacity, if so, calculating the difference between the sum and the current available capacity of the battery to obtain the capacity deviation value, and increasing the current available capacity of the battery according to the capacity deviation value and the second correction coefficient.
5. The method of claim 1, wherein the iteratively estimating according to the discharge capacity and the residual capacity to correct the current available capacity of the battery further comprises:
calculating a SOC change value of the battery;
judging whether the SOC change value exceeds a preset SOC threshold value or not;
if yes, the current available capacity of the battery is revised again.
6. The method for modifying the available capacity of the battery according to claim 1, wherein modifying the currently available capacity of the battery according to the historical usage parameters comprises:
estimating available capacity based on the historical usage parameters to obtain estimated available capacity;
calculating a capacity difference between the estimated available capacity and the current available capacity of the battery;
judging whether the absolute value of the capacity difference value is larger than a capacity difference threshold value or not;
if so, adjusting the current available capacity of the battery, and adjusting the amplitude to be the capacity difference.
7. The method of modifying available capacity of a battery as claimed in claim 6, wherein said estimating available capacity from said historical usage parameters to obtain estimated available capacity comprises:
calculating the equivalent discharge cycle number of the battery according to the discharge capacity, and obtaining a first SOH value according to the equivalent discharge cycle number of the battery;
acquiring time information, calculating the accumulated running time of the battery according to the time information, and acquiring a second SOH value according to the accumulated time of the battery;
acquiring the vehicle driving mileage, calculating the total accumulated driving mileage of a battery according to the vehicle driving mileage, and acquiring a third SOH value according to the total accumulated driving mileage of the battery;
estimating a battery SOH value based on the first SOH value, the second SOH value, and the third SOH value;
and obtaining the estimated available capacity according to the SOH value of the battery.
8. A computer-readable storage medium, in which a computer program is stored which, when executed, implements a method of correcting the available capacity of a battery as claimed in any one of claims 1 to 7.
9. A vehicle comprising a battery and a battery manager for performing the method of correcting the available capacity of the battery according to any one of claims 1-7.
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| CN115113072A (en) * | 2021-12-28 | 2022-09-27 | 长城汽车股份有限公司 | Estimation method of battery SOC and related device |
| CN114594394A (en) * | 2022-02-10 | 2022-06-07 | 福建时代星云科技有限公司 | Method and terminal for calibrating available capacity of electric automobile |
| WO2023216243A1 (en) * | 2022-05-13 | 2023-11-16 | 深圳市富兰瓦时技术有限公司 | Battery pack soh estimation method and residential energy storage system |
| CN116401497B (en) * | 2023-06-08 | 2023-09-26 | 上海泰矽微电子有限公司 | SOH estimation method for feature fusion |
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