CN114609530B - Method, device, equipment and medium for correcting battery state of charge - Google Patents
Method, device, equipment and medium for correcting battery state of charge Download PDFInfo
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- CN114609530B CN114609530B CN202011430004.5A CN202011430004A CN114609530B CN 114609530 B CN114609530 B CN 114609530B CN 202011430004 A CN202011430004 A CN 202011430004A CN 114609530 B CN114609530 B CN 114609530B
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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Abstract
本申请公开了一种修正电池荷电状态的方法、装置、设备及介质，所述修正电池荷电状态的方法，包括：获取串联电池组在当前时刻的荷电状态初始显示值和当前时刻的荷电状态真实值；根据所述荷电状态真实值和所述荷电状态初始显示值计算误差电量；根据所述荷电状态真实值和所述串联电池组的工作模式确定剩余补偿时间；在所述剩余补偿时间内，根据所述串联电池组的工作模式和所述误差电量对所述荷电状态初始显示值进行修正，得到修正后的当前时刻的荷电状态修改显示值。本申请在剩余补偿时间内，根据串联电池组的工作模式和误差电量均匀地对荷电状态初始显示值进行修正，得到高精度的荷电状态修改显示值。
The present application discloses a method, device, equipment and medium for correcting the state of charge of a battery, wherein the method for correcting the state of charge of a battery in series comprises: obtaining the initial display value of the state of charge of a battery in series at the current moment and the true value of the state of charge at the current moment; calculating the error power according to the true value of the state of charge and the initial display value of the state of charge; determining the remaining compensation time according to the true value of the state of charge and the working mode of the battery in series; during the remaining compensation time, correcting the initial display value of the state of charge according to the working mode of the battery in series and the error power, and obtaining the corrected modified display value of the state of charge at the current moment. During the remaining compensation time, the present application uniformly corrects the initial display value of the state of charge according to the working mode of the battery in series and the error power, and obtains a high-precision modified display value of the state of charge.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method, an apparatus, a device, and a medium for correcting a battery state of charge.
Background
The state of charge (SOC) of the battery is an important basis for the overall vehicle control system to formulate an optimal energy management strategy. The accurate estimation of the SOC value of the battery is particularly important for prolonging the service life of the battery.
The common calculation method for calculating the state of charge of the battery comprises ampere-hour integration, voltage correction, a neural network and the like, wherein the neural network calculates the SOC more accurately, a large number of stable operation conditions are needed for calculating correction, occupied resources are high, the voltage correction is influenced by factors such as temperature and current due to the electromotive force and internal resistance characteristics of the battery, the use limiting conditions are more, and the ampere-hour integration can continuously accumulate errors due to the current sampling precision.
In the related art, the ampere-hour integral is used as the SOC base calculation for the series battery system, and then the voltage correction is matched. However, the above-described method has a problem in that the accuracy of the state of charge of the battery is low.
Disclosure of Invention
Accordingly, the present invention provides a method, apparatus, device, and medium for modifying a battery state of charge that at least partially addresses the above-mentioned problems.
The invention provides a method for correcting a battery state of charge, which comprises the following steps:
Acquiring an initial charge state display value of the serial battery pack at the current moment and a true charge state value at the current moment;
Calculating error electric quantity according to the state-of-charge true value and the state-of-charge initial display value;
determining residual compensation time according to the state-of-charge true value and the working mode of the series battery pack;
And in the residual compensation time, the initial charge state display value is uniformly corrected according to the working mode of the series battery pack and the error electric quantity, and the corrected charge state correction display value at the current moment is obtained.
As an optimal manner, the correction of the initial display value of the state of charge according to the working mode of the series battery pack and the error electric quantity includes:
determining a compensation ratio relation according to the battery power display interval time and the residual compensation time;
determining a compensation electric quantity according to the relation between the error electric quantity and the compensation ratio;
and correcting the initial display value of the charge state according to the working mode of the series battery pack and the compensation electric quantity.
As an optimal manner, the correcting the initial display value of the state of charge according to the working mode of the serial battery pack and the compensation electric quantity includes:
When the working mode of the series battery pack is a charging mode and the error electric quantity is a positive number, the compensation electric quantity is increased on the initial display value of the charge state;
when the working mode of the series battery pack is a charging mode and the error electric quantity is a negative number, subtracting the compensation electric quantity from the initial charge state display value;
When the working mode of the series battery pack is a discharging mode and the error electric quantity is a positive number, adding the compensation electric quantity to the initial charge state display value;
And when the working mode of the series battery pack is a discharging mode and the error electric quantity is a negative number, subtracting the compensation electric quantity from the initial charge state display value.
As an optimal manner, before the initial value of the state of charge modification is corrected according to the compensation electric quantity in the residual compensation time, the method further comprises:
When the initial display value of the charge state is larger than or equal to a first threshold value, the initial value of the charge state modification is modified according to the compensation electric quantity, wherein the first threshold value is a threshold value used for triggering modification and set by the serial battery pack in a charging mode, or
And when the initial state of charge display value is smaller than or equal to a second threshold value, correcting the initial state of charge display value according to the compensation electric quantity, wherein the second threshold value is a threshold value used for triggering correction and set by the series battery pack in a discharging mode.
As an optimal manner, determining a remaining compensation time according to the initial state of charge display value and the operation mode of the series battery pack includes:
When the working mode of the series battery pack is a charging mode, determining the time required for the series battery pack to charge from the initial state of charge display value to the full state of the series battery pack as the residual compensation time;
and when the working mode of the series battery pack is a discharging mode, determining the time required for the series battery pack to discharge from the initial charge state display value to the emptying state of the series battery pack as the residual compensation time.
As an optimal manner, the obtaining the true state of charge value of the battery includes:
acquiring a voltage-battery capacity mapping curve established by temperature;
Selecting a voltage-battery capacity mapping curve corresponding to the current temperature according to the current temperature of the series battery pack;
Acquiring an open-circuit voltage of the series battery pack at the current temperature according to the working mode of the series battery pack;
and obtaining a state-of-charge true value of the series battery pack at the current temperature based on a voltage-battery capacity mapping curve corresponding to the open-circuit voltage at the current temperature and the current temperature.
As an optimal manner, the obtaining the true state of charge value of the battery further includes:
acquiring a voltage-battery capacity mapping curve established by temperature and charge-discharge multiplying power;
Selecting a voltage-battery capacity mapping curve corresponding to the current temperature and the current charge-discharge multiplying power according to the current temperature and the current charge-discharge multiplying power of the series battery pack;
Acquiring an open-circuit voltage of the series battery pack at the current temperature according to the working mode of the series battery pack;
And obtaining a charge state true value of the series battery pack at the current temperature based on a voltage-battery capacity mapping curve corresponding to the open-circuit voltage at the current temperature, the current temperature and the current charge-discharge multiplying power.
The invention provides a device for correcting the charge state of a battery, which comprises:
The acquisition unit is used for acquiring an initial charge state display value of the serial battery pack at the current moment and a true charge state value at the current moment;
The calculating unit is used for calculating error electric quantity according to the state-of-charge true value and the state-of-charge initial display value;
The determining unit is used for determining residual compensation time according to the state-of-charge true value and the working mode of the series battery pack;
and the correction unit is used for uniformly correcting the initial charge state display value by utilizing the error electric quantity in the residual compensation time to obtain a corrected charge state modified display value at the current moment.
The invention provides a terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor for implementing a method of modifying a state of charge of a battery as described when said program is executed.
The present invention provides a computer readable storage medium having stored thereon a computer program for implementing a method of modifying a battery state of charge as described.
The method comprises the steps of uniformly correcting an initial state of charge display value according to a working mode and error electric quantity of a series battery pack in residual compensation time to obtain a high-precision state of charge modified display value, establishing a voltage-battery capacity mapping curve, simultaneously considering two factors of temperature, charging and discharging multiplying power to establish a binary mapping relation, enabling the binary mapping relation to be higher in fitting degree with an actual state of charge, enabling the initial state of charge display value SOC n to be smaller than or equal to 20%, enabling the initial state of charge SOC n to be larger than or equal to 80% under charging and discharging working conditions, enabling the initial state of charge SOC n to be wide in correction range, enabling the initial state of charge SOC n to be larger than a true state of charge SOC m under charging and discharging working conditions, or enabling the initial state of charge SOC n to be smaller than the true state of charge SOC m, enabling the initial state of charge to be smooth through compensation electric quantity before the cut-off voltage is achieved, and enabling the SOC to be good in smooth effect.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a method of modifying a battery state of charge according to an embodiment of the present application;
fig. 2 is a voltage-battery capacity map according to an embodiment of the present application.
FIG. 3 is a topology of a method of modifying battery state of charge according to an embodiment of the present application;
FIG. 4 is a graph of the effect of correcting a state of charge value of a battery under a charging condition according to an embodiment of the present application;
FIG. 5 is a second graph of the effect of correcting a state of charge value of a battery under a charging condition according to an embodiment of the present application;
FIG. 6 is a graph of the effect of modifying a state of charge value of a battery under a discharging condition according to an embodiment of the present application;
fig. 7 is a second graph of the effect of correcting the state of charge value of the battery under the discharging condition according to the embodiment of the present application.
Fig. 8 is a schematic structural diagram of a computer system of a terminal device or a server according to an embodiment of the present application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not limiting of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
In the field of new energy electric automobiles, a power storage battery pack consists of series battery packs. The state of charge of the series battery is an important indicator, namely the ratio of the actual amount of power that can be provided in the current state to the amount of power that can be provided by fully charged battery is indicated by SOC (state of charge). The state of charge (SOC) is an important basis for the whole vehicle control system to formulate an optimal energy management strategy, and the state of charge (SOC) is accurately estimated, so that the method has important significance for prolonging the service life of the serial battery pack, improving the safety and reliability of the serial battery pack and improving the performance of the new energy electric vehicle.
The charge state display value is displayed on a display screen of the client, so that the user can conveniently check in real time. The state of charge display value represents the current amount of charge remaining in the series battery pack. The state of charge true value is defined based on the rated capacity of the series battery pack and is used for representing the current actual residual electric quantity of the series battery pack.
After a Battery Management System (BMS) of the new energy electric automobile is powered on, a certain corresponding relation is generally made between a true state of charge value and a state of charge display value, and the mapping function is simply called. The use range of the vehicle power battery SOC is generally 15% -95%, the state of charge display value and the state of charge true value are mapped, and the 80% use range of the vehicle power battery SOC is stretched to 100% for display. I.e. 15% corresponds to 0,95% corresponds to 100%.
In order to improve the accuracy of the state of charge display value, the invention provides a method for correcting the state of charge of a battery, which is used for correcting the state of charge display value, improving the accuracy and the precision of the state of charge display value, and being beneficial to prolonging the service life of a series battery pack and improving the safety and reliability of the series battery pack.
Fig. 1 shows a method of modifying a state of charge of a battery, comprising the steps of:
Step S10, acquiring an initial state of charge (SOC) display value SOC n at the current moment and a true state of charge (SOC) value SOC m at the current moment of the serial battery pack;
S11, acquiring a state of charge true value SOC m.
The open-circuit voltage method is adopted to obtain the true state of charge (SOC m) of the battery, and is only suitable for the parking state of the new energy electric automobile, and cannot be estimated on line and dynamically, namely, the open-circuit voltage method cannot be applied to the new energy electric automobile under the charging and discharging working conditions. The open circuit voltage, i.e. the terminal voltage of the battery in the open circuit state, is denoted by OCV (open circuit voltage), and it is generally considered that the battery has been left for a long time (1 h-3 h) after charging or discharging, and the battery has been freed from polarization effects to reach a stable state, and the voltage at both ends of the battery is the open circuit voltage at this time.
The acquiring of the state of charge true value SOC m includes the steps of:
I. acquiring a voltage-battery capacity mapping curve established by temperature and charge-discharge multiplying power;
The battery cells of the series battery pack are used as test correspondence, and the cut-off voltage is 3.0V-3.8V. The temperatures are-10 ℃,0 ℃,10 ℃, 20 ℃, 30 ℃,40 ℃ and 50 ℃, the charging multiplying power (discharging multiplying power) is 0.1 ℃,0.2 ℃, 0.3 ℃, 0.4 ℃, 0.5 ℃, 0.6 ℃, 0.7 ℃, 0.8 ℃, 0.9 ℃ and 1.0 ℃, and one of-10 ℃ to 50 ℃ and one of 0.1 ℃ to 1.0 ℃ are selected to obtain a corresponding voltage-battery capacity mapping curve.
Referring to fig. 2, a voltage-battery capacity map corresponding to a discharge rate of 0.5C and a temperature of-10C is obtained as follows:
And S111, charging the battery to the upper limit voltage of 3.8V at the temperature of-10 ℃.
And S112, standing the full-charge battery in the S111 for 3 hours in an environment of-10 ℃ and recording the current OCV value V 111. Then, the current OCV value V 112 and the current discharge capacity C 112 were recorded after standing for 2 hours at a discharge rate of 0.5C to 3.7V.
And S113, continuously discharging the battery processed in the step S112 to 3.6V at a discharge rate of 0.5C at the current temperature, and recording the current OCV value V 113 and the current discharge capacity C 113 after standing for 2 hours.
And S114, continuously discharging the battery processed in the step S113 to 3.5V at the current temperature at the discharge rate of 0.5C, and recording the current OCV value V 114 and the current discharge capacity C 114 after standing for 2 hours.
And S115, continuously discharging the battery processed in the step S114 to 3.4V at a discharge rate of 0.5C at the current temperature, and recording the current OCV value V 115 and the current discharge capacity C 115 after standing for 2 hours.
And S116, continuously discharging the battery processed in the step S115 to 3.3V at a discharge rate of 0.5C at the current temperature, and recording the current OCV value V 116 and the current discharge capacity C 116 after standing for 2 hours.
And S117, continuously discharging the battery processed in the step S116 to 3.2V at a discharge rate of 0.5C at the current temperature, and recording the current OCV value V 117 and the current discharge capacity C 117 after standing for 2 h.
And S118, continuously discharging the battery processed in the step S117 to 3.1V at a discharge rate of 0.5C at the current temperature, and recording the current OCV value V 118 and the current discharge capacity C 118 after standing for 2 hours.
And S119, continuously discharging the battery processed in the step S118 to 3.0V at a discharge rate of 0.5C at the current temperature, and recording the current OCV value V 119 and the current discharge capacity C 119 after standing for 2 hours.
According to the OCV value V 111~V119 and the discharge capacity C 112~C119 recorded in the above steps, the SOC value may be converted, and one SOC value corresponds to one OCV value, thereby obtaining a voltage-battery capacity map.
II. Selecting a voltage-battery capacity mapping curve corresponding to the current temperature and the current charge-discharge multiplying power according to the current temperature and the current charge-discharge multiplying power of the series battery pack;
And III, acquiring the open-circuit voltage of the series battery pack at the current temperature according to the working mode of the series battery pack.
And obtaining the open circuit voltage of the series battery pack according to whether the change of the discharge multiplying power or the charge multiplying power of the series battery pack is smaller than 0.1C within 1 minute. If the discharge rate or the charge rate of the series battery pack changes by less than 0.1C within 1 minute, the voltages at both ends of the series battery pack are considered to be stable, and the voltages at both ends of the series battery pack are the open circuit voltages of the series battery pack. If the discharge rate or the charge rate of the series battery pack changes by more than 0.1C within 1 minute, the voltage at the two ends of the series battery pack is considered to be unstable, and the series battery pack needs to be kept still for a certain time until the voltage at the two ends of the series battery pack is stable.
And IV, obtaining a state of charge true value SOC m of the series battery pack at the current temperature based on a voltage-battery capacity mapping curve corresponding to the open-circuit voltage at the current temperature, the current temperature and the current charge-discharge multiplying power.
It should be noted that, considering that there is a balance difference among the batteries in the series battery pack, the highest battery voltage that is first full to the cut-off voltage is selected as the open-circuit voltage under the charging condition, and the lowest battery voltage that is first empty to the cut-off voltage is selected as the open-circuit voltage under the discharging condition.
S12, acquiring an initial state of charge display value SOC n.
And acquiring an initial state of charge (SOC n) display value by adopting an ampere-hour integration method. The ampere-hour integration method is to estimate the state of charge, and in the charging process (discharging process), the electric quantity change value is obtained by integrating the discharging multiplying power (charging multiplying power) with respect to time.
,
Wherein, SOC o is the initial value of the state of charge; Is the battery capacity; is the charge or discharge multiplying power.
However, the ampere-hour integration estimation accuracy depends largely on the state of charge initial value SOC o. For the state of charge initial value SOC o, due to inaccurate current value acquisition, errors are accumulated continuously, and further, battery SOC value estimation is inaccurate.
Step S20, calculating error electric quantity according to the state of charge true value SOC m and the state of charge initial display value SOC n;
According to step S10, the initial state of charge SOC n and the true state of charge SOC m of the serial battery pack at the current time are obtained, the initial state of charge SOC n at the current time and the true state of charge SOC m at the current time are differentiated, and the difference is multiplied by the battery capacity C of the serial battery pack to obtain an error electric quantity.
Step S30, determining residual compensation time according to the state of charge true value SOC m and the working mode of the series battery pack;
The operation mode of the series battery pack includes a charge operation mode and a discharge operation mode.
Under the charging condition, the charging of the series battery pack does not reach the highest voltage, namely, the initial state of charge display value SOC n is less than 100 percent, the first residual compensation time from the initial state of charge display value SOC n to the full of 100 percent is T 1,
Wherein, C is the battery capacity, and I is the charging rate.
Under the discharging working condition, the discharging of the series battery pack does not reach the lowest voltage, namely the initial state of charge display value SOC n is more than 0 percent, the initial state of charge display value SOC n is separated from the second residual compensation time T 2 which is discharged to 0 percent,
Wherein, C is the battery capacity, and I is the discharge rate.
It should be noted that, before the state of charge initial value SOC n is corrected according to the compensation electric quantity in the remaining compensation time, the state of charge initial display value SOC n is greater than or equal to the first threshold value, or the state of charge initial display value SOC n is less than or equal to the second threshold value.
When the state of charge initial display value SOC n is greater than or equal to a first threshold value, the state of charge initial display value SOC n is corrected according to the compensation electric quantity, the first threshold value is a threshold value used for correction and set by the series battery pack in a charging mode, and the first threshold value is 80%. And when the state of charge initial display value SOC n is more than or equal to 80%, correcting the state of charge initial display value SOC n.
When the state of charge initial display value SOC n is smaller than or equal to a second threshold value, the state of charge initial display value SOC n is corrected according to the compensation electric quantity, and the second threshold value is a threshold value for correction, which is set by the series battery pack in a discharging mode. The second threshold is 20%. And when the state of charge initial display value SOC n is less than or equal to 20 percent, correcting the state of charge initial display value SOC n.
Referring to fig. 3, in step S40, the initial state of charge display value SOC n is uniformly modified according to the operation mode and the error charge of the series battery during the remaining compensation time, so as to obtain the modified state of charge display value SOC k at the current time after modification.
The method for correcting the initial state of charge (SOC n) display value according to the working mode and the error electric quantity of the series battery pack comprises the following steps:
s41, determining a compensation ratio relation according to the battery power display interval time and the residual compensation time;
Δt is the time interval from the state of charge display value at the next time to the state of charge display value at the current time.
S42, determining a compensation electric quantity Q according to the relation between the error electric quantity and the compensation ratio, wherein the compensation electric quantity Q is as follows under the charging or discharging working condition:
wherein T is T 1 or T 2, C is battery capacity, The difference between the state of charge initial display value SOC n at the current time and the state of charge true value SOC m at the current time.
S43, correcting the initial state of charge display value SOC n according to the working mode of the series battery pack and the compensation electric quantity.
S431, calculating the percentage of the compensation electric quantity Q and the battery capacity C;
s432, taking the sum of the percentage and the state of charge initial display value SOC n as a state of charge modification display value SOC k;
As shown in fig. 4, under the charging condition, the state of charge true value SOC m is less than the state of charge initial display value SOC n, the Δsoc is negative, the compensation power Q is negative, the compensation power is subtracted from the state of charge initial display value SOC n, and the state of charge initial display value SOC n is slowed down to rise, thereby forming the state of charge modified display value SOC k.
As shown in fig. 5, under the charging condition, the state of charge true value SOC m > the state of charge initial display value SOC n, the Δsoc is positive, the compensation power Q is increased on the state of charge initial display value, and the state of charge initial display value SOC n is accelerated to rise, thereby forming the state of charge modification display value SOC k.
As shown in fig. 6, under the discharging condition, the state of charge true value SOC m < the state of charge initial display value SOC n, Δsoc is negative, and the compensation electric quantity Q is subtracted from the state of charge initial display value, so as to accelerate the decrease of the state of charge initial display value SOC n, thereby forming the state of charge modification display value SOC k.
As shown in fig. 7, under the discharging condition, the state of charge true value SOC m > the state of charge initial display value SOC n, the Δsoc is positive, the compensation power Q is positive, and the compensation power Q is added to the state of charge initial display value, so as to slow down the decrease of the state of charge initial display value SOC n, thereby forming the decrease of the state of charge modification display value SOC k.
Compared with the related technology, the method for correcting the state of charge of the battery has the following advantages:
1. The voltage-battery capacity mapping curve established by the scheme simultaneously considers two factors of temperature, charge and discharge multiplying power to establish a binary mapping relation, and has higher fitting degree with the actual state of charge.
2. According to the scheme, under the charging working condition and the discharging working condition, the initial state of charge display value SOC n is less than or equal to 20%, the initial state of charge display value SOC n is more than or equal to 80%, and the correction range of the initial state of charge display value SOC n is wide.
3. According to the scheme, the initial state of charge (SOC) display value SOC n under the charging and discharging working conditions is larger than the true state of charge (SOC) value SOC m, or the initial state of charge (SOC) display value SOC n is smaller than the true state of charge (SOC) value SOC m, the electric quantity can be compensated for smoothing before the cut-off voltage is reached, the step jump of the SOC is avoided, and the SOC smoothing effect is good.
The invention also provides a device for correcting the charge state of a battery, which comprises:
The acquisition unit is used for acquiring an initial charge state display value of the serial battery pack at the current moment and a true charge state value at the current moment;
the calculating unit is used for calculating error electric quantity according to the true state of charge value and the initial state of charge display value;
the determining unit is used for determining the residual compensation time according to the state-of-charge true value and the working mode of the series battery pack;
And the correction unit is used for correcting the initial display value of the charge state by utilizing the error electric quantity in the residual compensation time to obtain a corrected charge state modification display value at the current moment.
The device provided by the embodiment of the application comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the method for determining the estimated arrival time. Referring now to fig. 8, fig. 8 is a schematic diagram illustrating a computer system of a terminal device or a server according to an embodiment of the present application.
As shown in fig. 8, the computer system 1300 includes a Central Processing Unit (CPU) 1301, which can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 1302 or a program loaded from a storage section 1303 into a Random Access Memory (RAM) 1303. In the RAM 1303, various programs and data necessary for the operation of the system 1300 are also stored. The CPU 1301, ROM1302, and RAM 1303 are connected to each other through a bus 1304. An input/output (I/O) interface 1305 is also connected to bus 1304.
Connected to the I/O interface 1305 are an input portion 1306 including a keyboard, a mouse, and the like, an output portion 1307 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, a speaker, and the like, a storage portion 1308 including a hard disk, and the like, and a communication portion 1309 including a network interface card such as a LAN card, a modem, and the like. The communication section 1309 performs a communication process via a network such as the internet. The drive 1310 is also connected to the I/O interface 1305 as needed. Removable media 1311, such as magnetic disks, optical disks, magneto-optical disks, semiconductor memory, and the like, is installed as needed on drive 1310 so that a computer program read therefrom is installed as needed into storage portion 1308.
In particular, according to embodiments of the present application, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the application include a computer program product comprising a computer program embodied on a machine-readable medium, the computer program comprising program code for performing the method shown in the flowcharts. In such embodiments, the computer program may be downloaded and installed from a network via the communication portion 1303, and/or installed from the removable medium 1311. The above-described functions defined in the system of the present application are performed when the computer program is executed by a Central Processing Unit (CPU) 1301.
The computer readable medium shown in the present application may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of a computer-readable storage medium may include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present application, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units or modules involved in the embodiments of the present application may be implemented in software or in hardware. The described units or modules may also be provided in a processor, for example as a processor comprising an acquisition unit, a calculation unit, a determination unit and a correction unit. The names of these units or modules do not limit the units or modules themselves in some cases, and the acquisition unit may also be described as a unit for acquiring the initial state of charge display value of the serial battery pack at the current time and the actual state of charge value at the current time, for example.
As another aspect, the present application also provides a computer-readable storage medium that may be included in the electronic device described in the above embodiment, or may exist alone without being incorporated in the electronic device. The computer readable storage medium stores one or more programs, when the programs are used by one or more processors to execute the method for determining the estimated arrival time described in the present application, the method includes obtaining the road segment characteristics of each road segment in the route to be estimated, performing attention weight distribution on the road segment characteristics of each road segment to obtain the route characteristics of the route to be estimated, and predicting the estimated arrival time corresponding to the route to be estimated by using the route characteristics.
In summary, the method, the device, the equipment and the medium for correcting the battery state of charge provided in the embodiment are used for obtaining the initial state of charge display value of the serial battery pack at the current moment and the actual state of charge value at the current moment, calculating the error electric quantity according to the actual state of charge value and the initial state of charge display value, determining the residual compensation time according to the actual state of charge value and the working mode of the serial battery pack, and correcting the initial state of charge display value according to the working mode of the serial battery pack and the error electric quantity in the residual compensation time to obtain the corrected state of charge correction display value at the current moment. According to the scheme, the initial state of charge (SOC) display value SOC n under the charging and discharging working conditions is larger than the true state of charge (SOC) value SOC m, or the initial state of charge (SOC) display value SOC n is smaller than the true state of charge (SOC) value SOC m, the electric quantity can be compensated for smoothing before the cut-off voltage is reached, the step jump of the SOC is avoided, and the SOC smoothing effect is good.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (9)
1. A method of modifying a state of charge of a battery, comprising:
Acquiring an initial charge state display value of the serial battery pack at the current moment and a true charge state value at the current moment;
Calculating error electric quantity according to the state-of-charge true value and the state-of-charge initial display value;
determining residual compensation time according to the initial state of charge display value and the working mode of the series battery pack;
And correcting the initial state of charge display value according to the working mode of the series battery pack and the error electric quantity within the residual compensation time to obtain a corrected state of charge correction display value at the current moment, wherein the correcting the initial state of charge display value according to the working mode of the series battery pack and the error electric quantity comprises the following steps:
determining a compensation ratio relation according to the battery electric quantity display interval time and the residual compensation time, and determining a compensation electric quantity according to the error electric quantity and the compensation ratio relation, wherein the compensation electric quantity is Q:
wherein Deltat is the battery power display interval time, T is the residual compensation time, The difference value between the initial state of charge display value at the current moment and the true state of charge value at the current moment is C, and the capacity of the battery is C;
correcting the initial state of charge display value according to the working mode of the series battery pack and the compensation electric quantity to obtain a state of charge modified display value SOC k which is as follows:
wherein, SOC n is the initial display value of the state of charge.
2. The method of claim 1, wherein correcting the initial state of charge display value based on the operating mode of the series battery and the compensation power comprises:
when the working mode of the series battery pack is a charging mode and the error electric quantity is a positive number, the ratio of the compensation electric quantity to the battery capacity is increased on the initial display value of the charge state;
When the working mode of the series battery pack is a charging mode and the error electric quantity is a negative number, subtracting the ratio of the compensation electric quantity to the battery capacity from the initial state of charge display value;
when the working mode of the series battery pack is a discharging mode and the error electric quantity is a positive number, adding the ratio of the compensation electric quantity to the battery capacity to the initial charge state display value;
And when the working mode of the series battery pack is a discharging mode and the error electric quantity is a negative number, subtracting the ratio of the compensation electric quantity to the battery capacity from the initial state of charge display value.
3. The method of claim 1, further comprising, during the remaining compensation time, before correcting the initial state of charge display value based on a compensation power, the method further comprising:
when the initial state of charge display value is greater than or equal to a first threshold value, correcting the initial state of charge display value according to the compensation electric quantity, wherein the first threshold value is a threshold value used for triggering correction and set by the serial battery pack in a charging mode, or
And when the initial state of charge display value is smaller than or equal to a second threshold value, correcting the initial state of charge display value according to the compensation electric quantity, wherein the second threshold value is a threshold value used for triggering correction and set by the series battery pack in a discharging mode.
4. The method of claim 1, wherein determining a remaining compensation time based on the initial state of charge display value and the operating mode of the series battery comprises:
When the working mode of the series battery pack is a charging mode, determining the time required for the series battery pack to charge from the initial state of charge display value to the full state of the series battery pack as the residual compensation time;
and when the working mode of the series battery pack is a discharging mode, determining the time required for the series battery pack to discharge from the initial charge state display value to the emptying state of the series battery pack as the residual compensation time.
5. The method for correcting a state of charge of a battery according to claim 1, wherein the obtaining a true state of charge value of the series battery at the current time includes:
acquiring a voltage-battery capacity mapping curve established by temperature;
Selecting a voltage-battery capacity mapping curve corresponding to the current temperature according to the current temperature of the series battery pack;
Acquiring an open-circuit voltage of the series battery pack at the current temperature according to the working mode of the series battery pack;
and obtaining a state-of-charge true value of the series battery pack at the current temperature based on a voltage-battery capacity mapping curve corresponding to the open-circuit voltage at the current temperature and the current temperature.
6. The method for correcting a state of charge of a battery according to claim 1, wherein the obtaining a true state of charge value of the series battery at the current time further comprises:
acquiring a voltage-battery capacity mapping curve established by temperature and charge-discharge multiplying power;
Selecting a voltage-battery capacity mapping curve corresponding to the current temperature and the current charge-discharge multiplying power according to the current temperature and the current charge-discharge multiplying power of the series battery pack;
Acquiring an open-circuit voltage of the series battery pack at the current temperature according to the working mode of the series battery pack;
And obtaining a charge state true value of the series battery pack at the current temperature based on a voltage-battery capacity mapping curve corresponding to the open-circuit voltage at the current temperature, the current temperature and the current charge-discharge multiplying power.
7. A device for modifying a state of charge of a battery, characterized in that the device is adapted to perform the method for modifying a state of charge of a battery according to any one of claims 1-6, the device comprising:
The acquisition unit is used for acquiring an initial charge state display value of the serial battery pack at the current moment and a true charge state value at the current moment;
The calculating unit is used for calculating error electric quantity according to the state-of-charge true value and the state-of-charge initial display value;
The determining unit is used for determining residual compensation time according to the initial state of charge display value and the working mode of the series battery pack;
and the correction unit is used for uniformly correcting the initial charge state display value by utilizing the error electric quantity in the residual compensation time to obtain a corrected charge state modified display value at the current moment.
8. A terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor for implementing a method of correcting a state of charge of a battery according to any of claims 1-6 when said program is executed.
9. A computer readable storage medium having stored thereon a computer program for implementing a method of correcting a state of charge of a battery according to any of claims 1-6.
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| CN115015787B (en) * | 2022-08-09 | 2022-11-18 | 深圳国瑞协创储能技术有限公司 | Battery SOC compensation method, device and equipment and computer readable storage medium |
| CN116754968B (en) * | 2023-06-30 | 2025-10-17 | 云南丁旺科技有限公司 | Battery state of charge detection method, battery system, and storage medium |
| CN116754966A (en) * | 2023-08-16 | 2023-09-15 | 浙江艾罗网络能源技术股份有限公司 | Calibration method and device for battery state of charge, electronic equipment and storage medium |
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| CN110879364A (en) * | 2018-08-27 | 2020-03-13 | 比亚迪股份有限公司 | Method and device for correcting SOC (state of charge) display of battery and electronic equipment |
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