CN110646738A - Power battery SOC obtaining method and system and related components - Google Patents
Power battery SOC obtaining method and system and related components Download PDFInfo
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- CN110646738A CN110646738A CN201910979372.6A CN201910979372A CN110646738A CN 110646738 A CN110646738 A CN 110646738A CN 201910979372 A CN201910979372 A CN 201910979372A CN 110646738 A CN110646738 A CN 110646738A
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- 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]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
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Abstract
The application discloses a method, a system, an electronic device and a computer readable storage medium for acquiring a power battery SOC, which comprises the following steps: calculating a basic SOC according to the standard rated capacity of the battery; acquiring a current temperature capacity retention rate, wherein the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery; and calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery. According to the method, the basic SOC is calculated based on the standard rated capacity of the battery, the basic SOC does not change along with the temperature, the SOC of the power battery is calculated through the current temperature capacity retention rate of the basic SOC under the current temperature state, the calculation is more accurate, the precision is higher, the charge state of the power battery under the current temperature can be better represented, and therefore the residual available capacity of the power battery under the current temperature can be accurately calculated.
Description
Technical Field
The present application relates to the field of power batteries, and in particular, to a method and a system for acquiring a power battery SOC, and related components.
Background
At present, the domestic definition Of the SOC (State Of Charge) Of a power battery is basically the percentage Of the remaining dischargeable capacity Of the power battery at the current temperature to the total dischargeable capacity Of the power battery at the current temperature, so the SOC is generally calculated by the following formula:
therein, SOC0Is the initial SOC (or the SOC value of the previous calculation period), and is the ampere-hour integral value of the calculation period CTAnd is the rated discharge capacity of the power battery at the current temperature.
Considering that the temperature of the power battery is changed during the charging or discharging process, and the rated discharge capacity C of the power battery at different temperaturesTUnlike, by adopting the above SOC calculation scheme, the SOC calculation is deviated along with the temperature change of the battery in the charging or discharging process, the accuracy is low, and the larger the temperature rise of the battery in charging or discharging is, the larger the SOC calculation deviation is, so that the remaining usable capacity of the power battery at the current temperature is inaccurate.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a method and a system for acquiring the SOC of a power battery, electronic equipment and a computer readable storage medium, the SOC of the power battery is calculated more accurately, the precision is higher, the state of charge of the power battery at the current temperature can be represented better, and therefore the residual available capacity of the power battery at the current temperature can be calculated accurately.
In order to solve the technical problem, the application provides a method for acquiring the SOC of a power battery, which includes:
calculating a basic SOC according to the standard rated capacity of the battery;
acquiring a current temperature capacity retention rate, wherein the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery;
and calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery.
Preferably, the process of calculating the base SOC according to the standard rated capacity of the battery specifically includes:
calculating a base SOC through an ampere-hour integral relation, wherein the ampere-hour integral relation isSOCbaseIs the base SOC, SOCbase0Is the initial SOC, and the integral value of ampere-hour, C, of the current calculation periodEThe rated capacity is the standard rated capacity of the battery.
Preferably, the process of calculating the target SOC according to the current temperature capacity retention rate and the base SOC specifically includes:
calculating the target SOC through an SOC calculation relation, wherein the SOC calculation relation is SOCtarg＝100％-(100％-SOCbase)×CT/CE，SOCtargIs the target SOC, CTIs the current temperature capacity.
Preferably, the method for acquiring the SOC of the power battery further includes:
and obtaining the current temperature capacity through a calibration test.
Preferably, after calculating the base SOC according to the standard rated capacity of the battery, the method for acquiring the SOC of the power battery further includes:
storing the base SOC to an EEPROM.
Preferably, after the basic SOC is calculated according to the battery standard rated capacity and before the target SOC is calculated according to the current temperature capacity retention rate and the basic SOC, the method for acquiring the SOC of the power battery further includes:
when the basic SOC meets the correction condition, correcting the basic SOC;
correspondingly, the process of calculating the target SOC according to the current temperature capacity retention rate and the basic SOC specifically includes:
and calculating the target SOC according to the current temperature capacity retention rate and the corrected basic SOC.
Preferably, the process of correcting the base SOC specifically includes:
and correcting the base SOC by a static OCV correction method, a small current dynamic discharge robust correction method, a full charge correction method, a constant current charge dynamic correction method or a full discharge correction method.
In order to solve the above technical problem, the present application further provides a system for acquiring SOC of a power battery, including:
the first calculation module is used for calculating a basic SOC according to the standard rated capacity of the battery;
the acquisition module is used for acquiring the current temperature capacity retention rate, wherein the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery;
and the second calculation module is used for calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery.
In order to solve the above technical problem, the present application further provides an electronic device, including:
a memory for storing a computer program;
a processor for implementing the steps of the power battery SOC acquisition method according to any one of the above when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer-readable storage medium, having a computer program stored thereon, where the computer program, when executed by a processor, implements the steps of the power battery SOC obtaining method as described in any one of the above.
The application provides a power battery SOC obtaining method, which includes the steps that firstly, a basic SOC is calculated based on a battery standard rated capacity, the basic SOC does not change along with temperature, then the basic SOC assists a current temperature capacity retention rate of a power battery in a current temperature state to calculate the SOC of the power battery, the calculation is more accurate, the precision is higher, the charge state of the power battery in the current temperature can be better represented, and therefore the residual available capacity of the power battery in the current temperature can be accurately calculated. The application also provides a power battery SOC acquisition system, electronic equipment and a computer readable storage medium, and the system, the electronic equipment and the computer readable storage medium have the same beneficial effects as the power battery SOC acquisition method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a method for acquiring a power battery SOC according to the present application;
FIG. 2 is a flowchart illustrating steps of another method for acquiring SOC of a power battery provided by the present application;
FIG. 3 is a flowchart illustrating steps of another method for acquiring SOC of a power battery provided by the present application;
fig. 4 is a schematic structural diagram of a power battery SOC acquisition system provided in the present application;
fig. 5 is a schematic structural diagram of an electronic device provided in the present application.
Detailed Description
The core of the application is to provide a method and a system for acquiring the SOC of the power battery, electronic equipment and a computer readable storage medium, the calculation of the SOC of the power battery is more accurate, the precision is higher, the state of charge of the power battery at the current temperature can be better represented, and therefore the residual available capacity of the power battery at the current temperature can be accurately calculated.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The SOC of the power battery is used for representing the residual available capacity of the power battery, the SOC of the power battery is required to be accurately estimated for improving the utilization efficiency and the safety performance of the power battery, the SOC of the power battery is usually estimated by an ampere-hour integration method at present, but the temperature of the power battery is changed in the charging or discharging process, and the rated discharge capacity C of the power battery at different temperatures is consideredTAnd the SOC calculation is deviated due to the adoption of an ampere-hour integration method, the accuracy is low, the larger the charging or discharging temperature rise of the battery is, the larger the SOC calculation deviation is, and therefore the estimated residual available capacity of the power battery at the current temperature is inaccurate. Based on the problems of the related art, the present application provides a new scheme for acquiring the SOC of the power battery through the following embodiments, which can achieve the purpose of estimating the SOC of the power battery with high accuracy.
The power Battery SOC that this application provided acquires the scheme and can realize through BMS (Battery Management System), can be applicable to a plurality of fields such as new forms of energy pure electric vehicles, new forms of energy hybrid vehicle and energy storage that load power Battery.
The process in which the BMS performs the power battery SOC acquisition operation will be described in detail below.
Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a method for acquiring a power battery SOC according to the present application, where the method includes:
s101: calculating a basic SOC according to the standard rated capacity of the battery;
the method aims to calculate the basic SOC of the power battery, wherein the basic SOC is the percentage of the residual capacity of the power battery in the standard capacity under the standard depth of discharge, and the characteristic is the residual discharge capacity of the power battery under the standard depth of discharge and does not change along with the temperature change. The standard discharge depth of the power battery refers to the discharge depth under the standard capacity of the power battery, namely the lower limit of the standard discharge depth of the power battery, namely the standard capacity of the power battery is completely discharged; the standard capacity of the power battery also refers to normal-temperature standard discharge capacity, namely, the power battery is fully discharged under normal-temperature environment standard full charge condition, and the discharged capacity in the whole process is the standard rated capacity of the power battery. Therefore, the basic SOC can well represent the charge state of the power battery under the discharge capacity really owned by the power battery, and the charge state calculation requirement of the power battery under the capacity really existed is met.
The present embodiment may calculate the base SOC according to the standard rated capacity of the battery according to a preset cycle, or the present embodiment may calculate the base SOC according to the standard rated capacity of the battery after receiving the calculation instruction, where the triggering condition for calculating the base SOC is not limited herein. Further, in order to improve the utilization efficiency and the safety performance of the power battery, the present embodiment may adopt a scheme of calculating the basic SOC of the power battery in real time.
It can be understood that, in consideration of the capacity conservation characteristic of the power battery (in the case of no irreversible capacity fading), the standard capacity is fixed, that is, the power battery can discharge so much capacity as long as it is fully charged, and is not affected by the temperature. The low-temperature discharge capacity is not that much capacity of the power battery, but the discharge capacity is low under the set calibration working condition at low temperature, and the power battery can still discharge the standard capacity when the normal temperature is recovered. Therefore, the calculation of the basic SOC can be based on the battery standard rated capacity and a traditional ampere-hour integral relational expression, the battery standard rated capacity is not influenced by temperature, so the residual discharge potential is not influenced by temperature, the calculation accuracy of the basic SOC mainly depends on the current acquisition accuracy, the conventional ampere-hour integral calculation accuracy can be basically controlled within 1% -2% according to the fact that the universal accuracy of the current sensor in the current industry can reach 0.5% in combination with the influences of chip accuracy, ground noise interference and the like on current acquisition.
Wherein, the traditional ampere-hour integral relation is as follows:
SOCbaseon the basis of SOC, SOCbase0Is the initial SOC, and the integral value of ampere-hour, C, of the current calculation periodEFor a standard rated capacity of the batteryThe solution is that the initial SOC is the base SOC obtained in the last calculation cycle.
S102: acquiring a current temperature capacity retention rate, wherein the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery;
the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery, and the current temperature capacity of the power battery refers to the discharge capacity of the power battery in the current temperature state and is obtained through a battery calibration test, namely the discharge capacity of the battery at different temperatures is obtained through independent tests.
The purpose of this step is to obtain the current temperature capacity retention rate for subsequent calculation of the target SOC. Considering that the temperature of the power battery also changes during the charging and discharging processes, the present embodiment should further include a step of obtaining the current temperature of the power battery. In order to improve the calculation efficiency, the temperature capacities of the power battery at different temperatures can be obtained in advance through a battery calibration test, and then the temperature capacity retention rates at different temperatures are calculated according to the temperature capacities at different temperatures. In order to facilitate subsequent use, the temperature capacity retention rates of the power battery at different temperatures may be embodied in the form of a table or a file, and in view of this, the embodiment may further include a step of storing the corresponding relationship between the current temperature and the current temperature capacity retention rate in the BMS in advance, so that when S102 is executed, the BMS may directly obtain the current temperature capacity retention rate corresponding to the current temperature.
Specifically, in this embodiment, the order of S101 and S102 is not specifically limited, and S101 may be performed first and then S102 may be performed, or S102 may be performed first and then S101 may be performed, and of course, S101 and S102 may be performed simultaneously, and may be set according to actual engineering requirements.
S103: and calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery.
The target SOC is the percentage of the residual capacity of the power battery in the current temperature discharge depth to the current temperature capacity, and represents the residual discharge capacity of the power battery in the current temperature discharge depth. The current temperature discharge depth of the power battery refers to the discharge depth of the power battery at the maximum discharge capacity calibrated at the current temperature, wherein the current temperature capacity of the power battery refers to the maximum discharge capacity calibrated at the current temperature of the battery, namely the power battery is fully discharged at the target temperature under the condition of normal-temperature environment standard full charge, and the capacity discharged in the whole process is the current temperature capacity of the battery. Therefore, the target SOC can well represent the state of charge of the power battery within the available capacity range at the current temperature, and the current available state of charge calculation requirement of the power battery is met.
The present embodiment may calculate the target SOC according to a preset period, where the preset period should correspond to a preset period for calculating the basic SOC, or may calculate the target SOC after receiving the calculation instruction, where the trigger condition for calculating the basic SOC is not limited herein. Further, in order to improve the utilization efficiency and the safety performance of the power battery, the embodiment may also correspondingly adopt a scheme of calculating the target SOC of the power battery in real time.
Specifically, according to the definition of the target SOC, the target SOC is related to the temperature, and obviously the target SOC cannot be calculated based on the ampere-hour integral formula. The present embodiment provides a scheme for calculating a target SOC at a current temperature, that is, under a condition that a current temperature capacity retention rate is known, a target SOC is calculated by finding a relationship between the target SOC and a base SOC at the current temperature, where the SOC calculation relationship is as follows:
SOCtarg＝100％-(100％-SOCbase)×CT/CE；
SOCtargis target SOC, CTIs the current temperature capacity.
Therefore, after the temperature capacity calibration of the power battery at each temperature is completed, the target SOC and the basic SOC have a fixed one-to-one mapping relation at each temperature, and therefore the precision of the target SOC can be guaranteed at the same time only by guaranteeing the precision of the basic SOC.
Further, the remaining usable capacity σ at the current temperature can be accurately calculated through the target SOC, and σ is equal to CT×SOCtarg。
The application provides a power battery SOC obtaining method, which includes the steps that firstly, a basic SOC is calculated based on a battery standard rated capacity, the basic SOC does not change along with temperature, then the basic SOC assists a current temperature capacity retention rate of a power battery in a current temperature state to calculate the SOC of the power battery, the calculation is more accurate, the precision is higher, the charge state of the power battery in the current temperature can be better represented, and therefore the residual available capacity of the power battery in the current temperature can be accurately calculated.
Referring to fig. 2, another method for acquiring the SOC of the power battery according to the embodiment of the present application is shown, and this embodiment is a further description of the operation related to S101 in the embodiment corresponding to fig. 1, and a more preferred implementation may be obtained by combining this embodiment with the embodiment corresponding to fig. 1, that is, after S101, the method further includes:
s104: the base SOC is stored to an EEPROM (Electrically Erasable Programmable Memory).
Specifically, the present embodiment is directed to save the value of the base SOC before power down, so that the base SOC before power down can be directly obtained from the EEPROM after power up next time, and S102 is executed by using the value of the base SOC as the value of the initial SOC to calculate a new base SOC. The value a of the basic SOC is stored in an EEPROM before power-off, and after the next power-on and when software and hardware are initialized, a is acquired from the EEPROM and is endowed to the SOCbase0Then according to
Calculating the current SOCbase。
Further, for the above purpose, the present embodiment may further include a step of determining whether a power-down condition is met, and if the power-down condition is met, the current basic SOC is stored in the EEPROM, and the power-down condition may be set according to actual engineering requirements, which is not specifically limited herein.
Referring to fig. 3, another method for acquiring the SOC of the power battery according to the embodiment of the present application is shown, and this embodiment is further described with respect to the operation of S101 in the embodiment corresponding to fig. 1, and a more preferred implementation may be obtained by combining this embodiment with the embodiment corresponding to fig. 1, where the specific process may include the following steps:
s201: calculating a basic SOC according to the standard rated capacity of the battery;
s202: judging whether the basic SOC meets the correction condition, if so, executing S203;
s203: correcting the basic SOC to obtain a corrected basic SOC;
s204: acquiring the capacity retention rate at the current temperature;
s205: and calculating the target SOC according to the current temperature capacity retention rate and the corrected basic SOC.
Specifically, the correction condition in this embodiment needs to be determined according to a correction scheme, and this embodiment may determine one or more correction schemes according to actual engineering needs, then determine the correction condition according to the specific correction scheme, and when the base SOC meets the correction condition, correct the base SOC according to the correction scheme, thereby further improving the accuracy of the base SOC calculated in this application, where the correction scheme may include, but is not limited to, an Open Circuit Voltage (Open Circuit Voltage) correction method, a small current dynamic discharge robust correction method, a full charge correction method, a constant current charge dynamic correction method, a full discharge correction method, and the like.
Specifically, the determination of whether the base SOC satisfies the correction condition may be performed according to a preset cycle, or may be performed after receiving the correction instruction, and the triggering condition for determining whether the base SOC satisfies the correction condition is not specifically limited herein.
Specifically, the execution time of S204 is not specifically limited in this embodiment, and may be completed before executing S205.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a power battery SOC acquisition system provided in the present application, including:
the first calculating module 1 is used for calculating a basic SOC according to the standard rated capacity of the battery;
the acquisition module 2 is used for acquiring the capacity retention rate of the current temperature;
the second calculation module 3 is used for calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery;
and the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery.
In the embodiment, the basic SOC is calculated based on the standard rated capacity of the battery, the basic SOC does not change along with the temperature, the SOC of the power battery is calculated by assisting the current temperature capacity retention rate of the power battery in the current temperature state through the basic SOC, the calculation is more accurate, the precision is higher, the charge state of the power battery in the current temperature can be better represented, and therefore the residual available capacity of the power battery in the current temperature can be accurately calculated.
As a preferred embodiment, the first computing module 1 is specifically configured to:
calculating a base SOC through an ampere-hour integral relation, wherein the ampere-hour integral relation isSOCbaseOn the basis of SOC, SOCbase0Is the initial SOC, and the integral value of ampere-hour, C, of the current calculation periodEThe standard rated capacity of the battery.
As a preferred embodiment, the second calculating module 3 is specifically configured to:
calculating the target SOC through an SOC calculation relation, wherein the SOC calculation relation is SOCtarg＝100％-(100％-SOCbase)×CT/CE，SOCtargIs target SOC, CTIs the current temperature capacity.
As a preferred embodiment, the power battery SOC acquisition system further includes:
and the capacity acquisition module is used for acquiring the current temperature capacity through a calibration test.
As a preferred embodiment, the power battery SOC acquisition system further includes:
and the storage module is used for storing the basic SOC into the EEPROM.
As a preferred embodiment, the power battery SOC acquisition system further includes:
the correction module is used for correcting the basic SOC when the basic SOC meets the correction condition;
correspondingly, the second calculating module 3 is specifically configured to:
and calculating the target SOC according to the current temperature capacity retention rate and the corrected basic SOC.
As a preferred embodiment, the process of correcting the base SOC specifically includes:
and correcting the base SOC by a static OCV correction method, a small current dynamic discharge robust correction method, a full charge correction method, a constant current charge dynamic correction method or a full discharge correction method.
Please refer to the above embodiments for the introduction of the system for acquiring SOC of a power battery provided in the present application, which is not described herein again.
On the other hand, the present application further provides an electronic device, referring to fig. 5, which shows a schematic structural diagram of an electronic device according to an embodiment of the present application, where the electronic device 2100 according to the embodiment may include: a processor 2101 and a memory 2102.
Optionally, the electronic device may further comprise a communication interface 2103, an input unit 2104 and a display 2105 and a communication bus 2106.
The processor 2101, the memory 2102, the communication interface 2103, the input unit 2104, the display 2105, and the like communicate with each other via the communication bus 2106.
In the embodiment of the present application, the processor 2101 may be a Central Processing Unit (CPU), an application specific integrated circuit (asic), a digital signal processor, an off-the-shelf programmable gate array (fpga) or other programmable logic device (plc).
The processor may call a program stored in the memory 2102. Specifically, the processor may perform operations performed on the electronic device side in the following embodiments of the power battery SOC acquisition method.
The memory 2102 stores one or more programs, which may include program code including computer operating instructions, and in this embodiment, at least one program for implementing the following functions is stored in the memory:
calculating a basic SOC according to the standard rated capacity of the battery;
acquiring the capacity retention rate at the current temperature;
calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery;
and the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery.
Therefore, in the embodiment, the basic SOC is calculated based on the standard rated capacity of the battery, the basic SOC does not change along with the temperature, the SOC of the power battery is calculated by assisting the current temperature capacity retention rate of the power battery in the current temperature state through the basic SOC, the calculation is more accurate, the precision is higher, the charge state of the power battery in the current temperature can be better represented, and the residual available capacity of the power battery in the current temperature can be accurately calculated.
In one possible implementation, the memory 2102 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function (such as calculating a base SOC, etc.), and the like; the storage data area may store data created according to the use of the computer.
Further, the memory 2102 may include high speed random access memory, and may also include non-volatile memory, such as at least one disk storage device or other volatile solid state storage device.
The communication interface 2103 may be an interface of a communication module, such as an interface of a GSM module.
The present application may also include a display 2104 and an input unit 2105, among others.
Of course, the structure of the internet of things device shown in fig. 5 does not constitute a limitation on the internet of things device in the embodiment of the present application, and in practical applications, the electronic device may include more or less components than those shown in fig. 5, or some components in combination.
In another aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the power battery SOC obtaining method provided in any one of the above embodiments.
The computer-readable storage medium has the same beneficial effects as the power battery SOC obtaining method.
For the introduction of a computer-readable storage medium provided in the present application, please refer to the above embodiments, which are not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power battery SOC obtaining method is characterized by comprising the following steps:
calculating a basic SOC according to the standard rated capacity of the battery;
acquiring a current temperature capacity retention rate, wherein the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery;
and calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery.
2. The method for acquiring the SOC of the power battery according to claim 1, wherein the process of calculating the base SOC according to the standard rated capacity of the battery specifically comprises:
calculating a base SOC through an ampere-hour integral relation, wherein the ampere-hour integral relation is
SOCbaseIs the base SOC, SOCbase0Is the initial SOC, and the integral value of ampere-hour, C, of the current calculation periodEThe rated capacity is the standard rated capacity of the battery.
3. The method for acquiring the SOC of the power battery according to claim 2, wherein the process of calculating the target SOC according to the current temperature capacity retention rate and the basic SOC specifically comprises:
calculating the target SOC through an SOC calculation relation, wherein the SOC calculation relation is SOCtarg＝100％-(100％-SOCbase)×CT/CE，SOCtargIs the target SOC, CTIs the current temperature capacity.
4. The power battery SOC acquisition method according to claim 1, further comprising:
and obtaining the current temperature capacity through a calibration test.
5. The method for acquiring the SOC of the power battery according to claim 1, wherein after the base SOC is calculated according to the standard rated capacity of the battery, the method for acquiring the SOC of the power battery further comprises:
storing the base SOC to an EEPROM.
6. The method for acquiring the SOC of the power battery according to any one of claims 1-5, wherein after the basic SOC is calculated according to the standard rated capacity of the battery and before the target SOC is calculated according to the current temperature capacity retention rate and the basic SOC, the method for acquiring the SOC of the power battery further comprises the following steps:
when the basic SOC meets the correction condition, correcting the basic SOC;
correspondingly, the process of calculating the target SOC according to the current temperature capacity retention rate and the basic SOC specifically includes:
and calculating the target SOC according to the current temperature capacity retention rate and the corrected basic SOC.
7. The method for acquiring the SOC of the power battery according to claim 6, wherein the process of correcting the base SOC specifically comprises:
and correcting the base SOC by a static OCV correction method, a small current dynamic discharge robust correction method, a full charge correction method, a constant current charge dynamic correction method or a full discharge correction method.
8. A power battery SOC acquisition system, comprising:
the first calculation module is used for calculating a basic SOC according to the standard rated capacity of the battery;
the acquisition module is used for acquiring the current temperature capacity retention rate, wherein the current temperature capacity retention rate is the ratio of the current temperature capacity to the standard rated capacity of the battery;
and the second calculation module is used for calculating a target SOC according to the current temperature capacity retention rate and the basic SOC, and taking the target SOC as the SOC of the power battery.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the power battery SOC acquisition method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the steps of the power battery SOC acquisition method according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910979372.6A CN110646738A (en) | 2019-10-15 | 2019-10-15 | Power battery SOC obtaining method and system and related components |
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| CN201910979372.6A CN110646738A (en) | 2019-10-15 | 2019-10-15 | Power battery SOC obtaining method and system and related components |
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Cited By (5)
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| CN112213659A (en) * | 2020-01-20 | 2021-01-12 | 蜂巢能源科技有限公司 | Battery capacity correction method and test system |
| CN113820605A (en) * | 2021-09-30 | 2021-12-21 | 蜂巢能源科技(无锡)有限公司 | Battery SOC correction method and device, computer readable storage medium |
| CN114932841A (en) * | 2022-06-15 | 2022-08-23 | 岚图汽车科技有限公司 | Battery residual capacity correction method, device, equipment and medium |
| CN115113059A (en) * | 2021-12-29 | 2022-09-27 | 长城汽车股份有限公司 | Target SOC determination method and device under series power generation working condition and vehicle |
| CN118211036A (en) * | 2024-03-30 | 2024-06-18 | 武汉亿纬储能有限公司 | Performance analysis method and related equipment of energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112213659A (en) * | 2020-01-20 | 2021-01-12 | 蜂巢能源科技有限公司 | Battery capacity correction method and test system |
| CN112213659B (en) * | 2020-01-20 | 2023-10-13 | 蜂巢能源科技有限公司 | Battery capacity correction method and test system |
| CN113820605A (en) * | 2021-09-30 | 2021-12-21 | 蜂巢能源科技(无锡)有限公司 | Battery SOC correction method and device, computer readable storage medium |
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| CN115113059A (en) * | 2021-12-29 | 2022-09-27 | 长城汽车股份有限公司 | Target SOC determination method and device under series power generation working condition and vehicle |
| CN114932841A (en) * | 2022-06-15 | 2022-08-23 | 岚图汽车科技有限公司 | Battery residual capacity correction method, device, equipment and medium |
| CN114932841B (en) * | 2022-06-15 | 2025-03-18 | 岚图汽车科技有限公司 | A battery remaining capacity correction method, device, equipment and medium |
| CN118211036A (en) * | 2024-03-30 | 2024-06-18 | 武汉亿纬储能有限公司 | Performance analysis method and related equipment of energy storage system |
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