CN114035059A - Calculation method and device for displaying SOC (System on chip) precision and electronic equipment - Google Patents
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Abstract
The invention provides a calculation method and a device for displaying SOC precision and electronic equipment, wherein the calculation method comprises the following steps: determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery, and determining errors of the parameters; calculating the error of the real SOC according to the error of each parameter; determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery; and calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC. The calculation method for displaying the SOC precision can calculate the display SOC precision, the calculated display SOC precision is the maximum error of the display SOC, the display SOC determined based on the display SOC precision is more reliable, and the SOC of the power battery can be effectively monitored.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a calculation method and device for displaying SOC (system on chip) precision and electronic equipment.
Background
With the development of new energy automobiles, a power battery is used as a key component of an electric automobile, and testing the State of Charge (SOC) of the power battery is of great significance for monitoring the safety State and the service life of a battery cell, wherein the SOC is defined as the ratio of the residual capacity to the total capacity of the battery, and the SOC is expressed by a common percentage, and when the SOC is 0, the power battery is completely discharged; when the SOC is 1, the power battery is fully charged.
Currently, the acquisition of the SOC value is mostly performed by a Battery Management System (BMS). However, the obtained SOC value has a certain error, which requires evaluating the accuracy of the SOC value to obtain the accuracy of the displayed SOC, and then determining the SOC range according to the obtained accuracy of the displayed SOC to effectively monitor the battery cell.
In the prior art, the display SOC precision cannot be calculated, so a method for calculating the display SOC precision is urgently needed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for calculating display SOC accuracy, and an electronic device, so as to alleviate the technical problem that the display SOC accuracy cannot be calculated in the prior art.
In a first aspect, the present invention provides a calculation method for displaying SOC accuracy, including:
determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery, and determining errors of the parameters;
calculating the error of the real SOC according to the error of each parameter;
determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery;
and calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC.
Further, the calculation formula of the real SOC includes:
wherein,
SOCOCV_1represents a radicalThe SOC value obtained by looking up the SOC-OCV table at OCV1, I2Mean current, Δ t, representing the integral of the current2Representing the current integration calculation time, Q the nominal capacity, SOH1Representing the SOH value, I, during the current integration calculation1Represents SOH1Mean current at update, Δ t1Represents SOH1Time of update, SOCOCV1-SOCOCV0Representing the difference of the SOC corresponding to different voltages.
Further, the parameters affecting the true SOC include: BMS current measurement error and SOC-OCV maximum error, determine the error of each parameter, include:
determining the BMS current measurement error according to the accuracy of the current sensor;
and determining the maximum SOC variation value corresponding to the preset pressure difference according to the SOC-OCV corresponding relation of the battery cell, and further obtaining the maximum SOC-OCV error.
Further, calculating the error of the real SOC according to the error of each parameter, including:
calculating the equation Δ SOC (1+ Δ I) × (1+ Δ SOC) according to the real SOC errorocv) -1 calculating an error of said real SOC, wherein Δ SOC represents an error of said real SOC, Δ I represents an error of said BMS current measurement, Δ SOCocvRepresenting the maximum error of SOC-OCV.
Further, determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery, including:
determining the maximum SOC in the discharge power spectrum corresponding to the discharge power according to the discharge power in a preset working condition;
and taking the maximum SOC as a small endpoint value of the minimum interval of the real SOC, and taking a target value as a large endpoint value of the minimum interval of the real SOC, so as to obtain the minimum interval of the real SOC.
Further, calculating the display SOC accuracy of the power battery according to the error of the real SOC and the minimum interval of the real SOC, including:
calculating the interval length of the minimum interval of the real SOC according to the minimum interval of the real SOC;
and calculating the ratio of the error of the real SOC to the interval length, and taking the ratio as the display SOC precision of the power battery.
Further, the minimum interval of the real SOC includes: the minimum interval of the real SOC under the BOL and the minimum interval of the real SOC under the EOL;
the displaying SOC accuracy includes: display SOC accuracy under BOL and display SOC accuracy under EOL.
In a second aspect, an embodiment of the present invention further provides a computing apparatus for displaying SOC accuracy, including:
the first determining unit is used for determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery and determining errors of the parameters;
the first calculating unit is used for calculating the error of the real SOC according to the error of each parameter;
the second determining unit is used for determining a minimum interval of the real SOC for display according to a preset working condition and the discharge power spectrum of the power battery;
and the second calculation unit is used for calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC.
In a third aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to any one of the above first aspects when executing the computer program.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing machine executable instructions, which when invoked and executed by a processor, cause the processor to perform the method of any of the first aspect.
In an embodiment of the present invention, a calculation method for displaying SOC accuracy is provided, including: determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery, and determining errors of the parameters; calculating the error of the real SOC according to the error of each parameter; determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery; and calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC. According to the calculation method for displaying the SOC precision, the display SOC precision can be calculated, the calculated display SOC precision is the maximum error of the display SOC, the display SOC determined based on the display SOC precision is more reliable, the SOC of the power battery can be effectively monitored, and the technical problem that the display SOC precision cannot be calculated in the prior art is solved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a calculation method for displaying SOC accuracy according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating determining a minimum interval of a real SOC for display according to a preset operating condition and a discharge power spectrum of a power battery according to an embodiment of the present invention;
FIG. 3 is a flowchart for calculating the display SOC accuracy of a power battery according to the error of the true SOC and the minimum interval of the true SOC, provided by the embodiment of the invention;
FIG. 4 is a schematic diagram of a computing device for displaying SOC accuracy according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
At present, the acquisition of the SOC value is mostly completed by a Battery Management System (BMS), however, the acquired SOC value has a certain error, and the accuracy of the displayed SOC cannot be evaluated.
Therefore, the calculation method for the display SOC precision can calculate the display SOC precision, the calculated display SOC precision is the maximum error of the display SOC, the display SOC determined based on the display SOC precision is more reliable, and the SOC of the power battery can be effectively monitored.
Embodiments of the present invention are further described below with reference to the accompanying drawings.
The first embodiment is as follows:
according to an embodiment of the present invention, there is provided an embodiment of a calculation method for displaying SOC accuracy, it is noted that the steps illustrated in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different from that herein.
Fig. 1 is a flowchart of a calculation method for displaying SOC accuracy according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery, and determining errors of the parameters;
the calculation method for displaying the SOC precision can be applied to a battery management system, and when the calculation for displaying the SOC precision is carried out, a calculation formula of a real SOC is obtained first, so that parameters influencing the real SOC and errors of the parameters are determined.
Step S104, calculating the error of the real SOC according to the error of each parameter;
step S106, determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery;
specifically, the reason why the minimum interval of the real SOC for display is determined is that the smaller the minimum interval divided by the error of the real SOC is, the larger the error of the calculated display SOC is, and if the error of the maximum display SOC can meet the requirement, it is indicated that the calculated display SOC of the power battery is relatively reliable and has high reliability.
And step S108, calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC.
In an embodiment of the present invention, a calculation method for displaying SOC accuracy is provided, including: determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery, and determining errors of the parameters; calculating the error of the real SOC according to the error of each parameter; determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery; and calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC. According to the calculation method for displaying the SOC precision, the display SOC precision can be calculated, the calculated display SOC precision is the maximum error of the display SOC, the display SOC determined based on the display SOC precision is more reliable, the SOC of the power battery can be effectively monitored, and the technical problem that the display SOC precision cannot be calculated in the prior art is solved.
In an optional embodiment of the present invention, the calculation formula of the real SOC includes:
wherein,
SOCOCV1represents the SOC value obtained by looking up the SOC-OCV table based on OCV1, I2Mean current, Δ t, representing the integral of the current2Representing the current integration calculation time, Q the nominal capacity, SOH1Representing the SOH value, I, during the current integration calculation1Represents SOH1Mean current at update, Δ t1Represents SOH1Time of update, SOCOCV1-SOCOCV0Representing the difference of the SOC corresponding to different voltages.
In the above calculation equation, SOCOCV_1Represents the SOC value obtained by looking up the SOC-OCV table based on the OCV1,
the SOC obtained by ampere-hour integration is expressed, and the parameters affecting the actual SOC include: current and SOC-OCV lookup errors.
In an alternative embodiment of the invention, the parameters affecting the true SOC include: BMS current measurement error and SOC-OCV maximum error, determine the error of each parameter, specifically include the following steps:
(1) determining BMS current measurement errors according to the precision of the current sensor;
in the embodiment of the present invention, the accuracy of the current sensor is 0.5%, and then the determined BMS current measurement error is 0.5%.
(2) And determining the maximum SOC variation value corresponding to the preset pressure difference according to the SOC-OCV corresponding relation of the battery cell, and further obtaining the maximum SOC-OCV error.
Specifically, the SOC-OCV correspondence relationship of the battery cell includes: the SOC-OCV corresponding relation under the BOL and the SOC-OCV corresponding relation under the EOL, wherein the BOL represents an initially discharged battery cell, namely a new battery cell, and the EOL represents a battery cell with a life ending.
In the embodiment of the invention, for a medium-sized power battery, the maximum allowable deviation between the battery cells is 5mv, that is, the preset pressure difference is 5mv, a SOC-OCV correspondence between the battery cells BOL and EOL is obtained first, the correspondence is given by a manufacturer before the battery cells leave a factory, and specifically, the correspondence may be an OCV value corresponding to 5% of SOC per interval.
When the maximum change value of the SOC corresponding to the preset pressure difference is determined, a plurality of linear functions related to the SOC-OCV are determined according to the value of the OCV corresponding to the SOC at each interval of 5%, then the preset pressure difference is substituted into the linear functions, so that a plurality of SOC change values are obtained, then the maximum change value of the SOC is determined, and further the maximum error of the SOC-OCV is obtained.
For example: the SOC-OCV correspondence under the cell BOL is SOC 1-30%, OCV 1-3.6, SOC 2-35%, and OCV 2-3.607, from which a linear function about SOC-OCV can be calculated, and then 5mv is substituted into the OCV position in the function, so as to obtain the corresponding SOC variation value.
In the embodiment of the invention, for the power battery of middle aviation, the maximum error of SOC-OCV determined under BOL is 1.6%, and the maximum error of SOC-OCV determined under EOL is 1.5%.
After obtaining the error of each parameter, the error of the true SOC may be further calculated, and in an optional embodiment of the present invention, the calculating the error of the true SOC according to the error of each parameter specifically includes:
calculating the equation Δ SOC (1+ Δ I) × (1+ Δ SOC) according to the real SOC errorocv) -1 calculating an error of the true SOC, wherein Δ SOC represents the error of the true SOC, Δ I represents the BMS current measurement error, Δ SOCocvRepresents the maximum SOC-OCV error.
Specifically, the values obtained in the above are substituted into the true SOC error calculation formula, and Δ SOC under BOL (1+ 0.5%) ((1 + 1.6%)) -1 ═ 2.1%, and Δ SOC under EOL (1+ 0.5%) ((1 + 1.5%)) -1 ═ 2% are obtained.
In an alternative embodiment of the present invention, referring to fig. 2, in step S106, the determining a minimum interval of the real SOC for display according to the preset operating condition and the discharge power spectrum of the power battery specifically includes the following steps:
step S201, determining the maximum SOC in a discharge power spectrum corresponding to the discharge power according to the discharge power in a preset working condition;
in the embodiment of the invention, the preset working condition required by a client is that the 10-second discharge power is not less than 22.6kW, the continuous discharge power is not less than 8.8kW, the lowest limit value of the real SOC capable of being output is 8.3%, and the temperature point which can not ensure the power output is set according to the same value at the previous temperature, is lower than minus 26 ℃ and is set according to the value at minus 26 ℃.
The 10 second discharge power spectrum at BOL is:
| Cell SOC | 55℃ | 45℃ | 25℃ | 10℃ | 0℃ | -10℃ | -20℃ | -26℃ | -29℃ | -30℃ |
| 30％ | 0.0 | 150.0 | 150.0 | 150.0 | 100.5 | 58.9 | 33.6 | 24.1 | 18.3 | 0.0 |
| 25％ | 0.0 | 150.0 | 150.0 | 144.1 | 67.8 | 43.0 | 25.6 | 18.6 | 13.7 | 0.0 |
| 20％ | 0.0 | 150.0 | 150.0 | 109.3 | 46.2 | 32.8 | 18.1 | 14.0 | 11.1 | 0.0 |
| 15％ | 0.0 | 134.7 | 135.0 | 84.5 | 39.6 | 22.5 | 13.8 | 11.6 | 9.9 | 0.0 |
| 10％ | 0.0 | 73.2 | 73.4 | 49.8 | 20.4 | 14.0 | 9.5 | 9.0 | 8.5 | 0.0 |
| 8.3％ | 0.0 | 46.2 | 46.3 | 30.7 | 13.1 | 7.7 | 6.1 | 5.8 | 5.5 | 0.0 |
| 0％ | 0.0 | 46.2 | 46.3 | 30.7 | 13.1 | 7.7 | 6.1 | 5.8 | 5.5 | 0.0 |
the continuous discharge power spectrum at BOL is:
| Cell SOC | 55℃ | 45℃ | 25℃ | 10℃ | 0℃ | -10℃ | -20℃ | -26℃ | -29℃ | -30℃ |
| 30％ | 0.0 | 73.1 | 73.1 | 50.3 | 39.8 | 24.2 | 13.5 | 11 | 9.6 | 0.0 |
| 25％ | 0.0 | 70.1 | 70.2 | 49.9 | 39.5 | 23.9 | 10.3 | 9.3 | 8.7 | 0.0 |
| 20％ | 0.0 | 64.5 | 64.6 | 49.5 | 39.0 | 18.7 | 9.4 | 8.1 | 7.3 | 0.0 |
| 15％ | 0.0 | 49.1 | 49.1 | 39.1 | 19.1 | 10.7 | 8.5 | 7.0 | 6.0 | 0.0 |
| 10％ | 0.0 | 47.8 | 47.9 | 22.9 | 13.1 | 7.5 | 6.1 | 4.6 | 3.9 | 0.0 |
| 8.3％ | 0.0 | 27.7 | 27.7 | 13.2 | 5.9 | 2.9 | 1.5 | 1.1 | 0.8 | 0.0 |
| 0％ | 0.0 | 27.7 | 27.7 | 13.2 | 5.9 | 2.9 | 1.5 | 1.1 | 0.8 | 0.0 |
when the 10-second discharge power is not less than 22.6kW, the SOC in a 10-second discharge power spectrum corresponding to 22.6 kW:
| temperature of | 55 | 45 | 25 | 10 | 0 | -10 | -20 | -26 | -29 | -30 |
| SOC％ | 8.3 | 8.3 | 8.3 | 8.3 | 10.6 | 15 | 23 | 28.6 | 28.6 | 28.6 |
When the continuous discharge power is not less than 8.8kW, SOC in 1 continuous discharge power spectrum corresponding to 8.8 kW:
| temperature of | 55 | 45 | 25 | 10 | 0 | -10 | -20 | -26 | -29 | -30 |
| SOC％ | 8.3 | 8.3 | 8.3 | 8.3 | 9.0 | 12 | 16.7 | 22.9 | 22.9 | 22.9 |
At BOL, the maximum SOC in the discharge power spectrum at BOL corresponding to 22.6kW and 8.8kW was 28.6%.
Similarly, the maximum SOC in the discharge power spectrum under the EOL corresponding to the discharge powers 22.6kW and 8.8kW is 33.7%, and the discharge power spectrum under the EOL is not illustrated here.
Step S202, the maximum SOC is used as a small endpoint value of the minimum interval of the real SOC, the target value is used as a large endpoint value of the minimum interval of the real SOC, and then the minimum interval of the real SOC is obtained.
The target value may be 95%, so that the minimum interval of the real SOC under the final BOL is: (28.6%, 95%); the minimum interval for the true SOC at EOL is (33.7%, 95%).
In an optional embodiment of the present invention, referring to fig. 3, in the step S108, calculating the display SOC accuracy of the power battery according to the error of the actual SOC and the minimum interval of the actual SOC, specifically includes the following steps:
step S301, calculating the interval length of the minimum interval of the real SOC according to the minimum interval of the real SOC;
as an example in step S202, under BOL, the minimum interval of the real SOC is: (28.6%, 95%) interval length: 95% -28.6% ═ 66.4%; under EOL, the minimum interval of the true SOC is: (33.7%, 95%) interval length: 95% -33.7% ═ 61.3%.
And step S302, calculating the ratio of the error of the real SOC to the interval length, and taking the ratio as the display SOC precision of the power battery.
Specifically, the error of the true SOC under BOL is 2.1%, the interval length is 66.4%, and the calculated display SOC accuracy is 2.1%/66.4% — 3.2%;
the error of the true SOC at EOL is 2%, the interval length is 61.3%, and the calculated indicated SOC accuracy is 2%/61.3% — 3.3%.
The calculation method for displaying the SOC precision can calculate the display SOC precision, the calculated display SOC precision is the maximum error of the display SOC, the display SOC determined based on the display SOC precision is more reliable, and the SOC of the power battery can be effectively monitored.
Example two:
the embodiment of the present invention further provides a computing device for displaying SOC accuracy, where the computing device for displaying SOC accuracy is mainly used to execute the computing method for displaying SOC accuracy provided in the first embodiment of the present invention, and the computing device for displaying SOC accuracy provided in the first embodiment of the present invention is specifically described below.
Fig. 4 is a schematic diagram of a computing apparatus for displaying SOC accuracy according to an embodiment of the present invention, as shown in fig. 4, the apparatus mainly includes: a first determination unit 10, a first calculation unit 20, a second determination unit 30 and a second calculation unit 40, wherein:
the first determining unit is used for determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery and determining errors of the parameters;
the first calculating unit is used for calculating the error of the real SOC according to the error of each parameter;
the second determining unit is used for determining a minimum interval of the real SOC for displaying according to the preset working condition and the discharge power spectrum of the power battery;
and the second calculation unit is used for calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC.
In an embodiment of the present invention, there is provided a computing apparatus that displays SOC accuracy, including: determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery, and determining errors of the parameters; calculating the error of the real SOC according to the error of each parameter; determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery; and calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC. According to the calculation device for displaying the SOC precision, the display SOC precision can be calculated, the calculated display SOC precision is the maximum error of the display SOC, the display SOC determined based on the display SOC precision is more reliable, the SOC of the power battery can be effectively monitored, and the technical problem that the display SOC precision cannot be calculated in the prior art is solved.
Optionally, the calculation formula of the real SOC includes:
wherein,
SOCOCV1represents the SOC value obtained by looking up the SOC-OCV table based on OCV1, I2Mean current, Δ t, representing the integral of the current2Representing the current integration calculation time, Q the nominal capacity, SOH1Representing the SOH value, I, during the current integration calculation1Represents SOH1Mean current at update, Δ t1Represents SOH1Time of update, SOCOCV1-SOCOCV0Representing the difference of the SOC corresponding to different voltages.
Optionally, the parameters affecting the true SOC include: BMS current measurement error and SOC-OCV maximum error, the first determination unit is further configured to: determining BMS current measurement errors according to the precision of the current sensor; and determining the maximum SOC variation value corresponding to the preset pressure difference according to the SOC-OCV corresponding relation of the battery cell, and further obtaining the maximum SOC-OCV error.
Optionally, the first computing unit is further configured to: calculating the equation Δ SOC (1+ Δ I) × (1+ Δ SOC) according to the real SOC errorocv) -1 calculating an error of the true SOC, wherein Δ SOC represents the error of the true SOC, Δ I represents the BMS current measurement error, Δ SOCocvRepresents the maximum SOC-OCV error.
Optionally, the second determining unit is further configured to: determining the maximum SOC in a discharge power spectrum corresponding to the discharge power according to the discharge power in the preset working condition; and taking the maximum SOC as a small endpoint value of the minimum interval of the real SOC, and taking the target value as a large endpoint value of the minimum interval of the real SOC, thereby obtaining the minimum interval of the real SOC.
Optionally, the second computing unit is further configured to: calculating the interval length of the minimum interval of the real SOC according to the minimum interval of the real SOC; and calculating the ratio of the error of the real SOC to the interval length, and taking the ratio as the display SOC precision of the power battery.
Optionally, the minimum interval of the real SOC includes: the minimum interval of the real SOC under the BOL and the minimum interval of the real SOC under the EOL; displaying the SOC accuracy includes: display SOC accuracy under BOL and display SOC accuracy under EOL.
The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.
As shown in fig. 5, an electronic device 600 provided in an embodiment of the present application includes: a processor 601, a memory 602 and a bus, wherein the memory 602 stores machine-readable instructions executable by the processor 601, when the electronic device runs, the processor 601 and the memory 602 communicate with each other through the bus, and the processor 601 executes the machine-readable instructions to execute the steps of the calculation method for displaying the SOC accuracy.
Specifically, the memory 602 and the processor 601 can be general-purpose memories and processors, which are not limited to specific ones, and the processor 601 can execute the calculation method for displaying the SOC accuracy when executing the computer program stored in the memory 602.
The processor 601 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 601. The Processor 601 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and completes the steps of the method in combination with the hardware thereof.
Corresponding to the above calculation method for displaying SOC accuracy, an embodiment of the present application further provides a computer-readable storage medium, where machine executable instructions are stored, and when the computer executable instructions are called and executed by a processor, the computer executable instructions cause the processor to execute the steps of the above calculation method for displaying SOC accuracy.
The computing device for displaying the SOC accuracy provided by the embodiment of the present application may be specific hardware on the device, or software or firmware installed on the device, or the like. The device provided by the embodiment of the present application has the same implementation principle and technical effect as the foregoing method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiments where no part of the device embodiments is mentioned. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
For another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, 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 described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing an electronic device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the vehicle marking method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the scope of the embodiments of the present application. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A calculation method for displaying SOC accuracy, comprising:
determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery, and determining errors of the parameters;
calculating the error of the real SOC according to the error of each parameter;
determining a minimum interval of the real SOC for display according to a preset working condition and a discharge power spectrum of the power battery;
and calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC.
2. The method of claim 1, wherein the calculation of the true SOC comprises:
wherein,
SOCOCV1represents the SOC value obtained by looking up the SOC-OCV table based on OCV1, I2Mean current, Δ t, representing the integral of the current2Representing the current integration calculation time, Q the nominal capacity, SOH1Representing the SOH value, I, during the current integration calculation1Represents SOH1Mean current at update, Δ t1Represents SOH1Time of update, SOCOCV1-SOCOCV0Representing the difference of the SOC corresponding to different voltages.
3. The method of claim 2, wherein the quantities affecting true SOC comprise: BMS current measurement error and SOC-OCV maximum error, determine the error of each parameter, include:
determining the BMS current measurement error according to the accuracy of the current sensor;
and determining the maximum SOC variation value corresponding to the preset pressure difference according to the SOC-OCV corresponding relation of the battery cell, and further obtaining the maximum SOC-OCV error.
4. The method of claim 3 wherein calculating the error of the true SOC based on the error of the parameters comprises:
calculating the equation Δ SOC (1+ Δ I) × (1+ Δ SOC) according to the real SOC errorocv) -1 calculating an error of said real SOC, wherein Δ SOC represents an error of said real SOC, Δ I represents an error of said BMS current measurement, Δ SOCocvRepresenting the maximum error of SOC-OCV.
5. The method of claim 1, wherein determining a minimum interval of true SOC for display according to preset conditions and a discharge power spectrum of the power battery comprises:
determining the maximum SOC in the discharge power spectrum corresponding to the discharge power according to the discharge power in a preset working condition;
and taking the maximum SOC as a small endpoint value of the minimum interval of the real SOC, and taking a target value as a large endpoint value of the minimum interval of the real SOC, so as to obtain the minimum interval of the real SOC.
6. The method of claim 1, wherein calculating the display SOC accuracy of the power battery based on the error of the real SOC and the minimum interval of the real SOC comprises:
calculating the interval length of the minimum interval of the real SOC according to the minimum interval of the real SOC;
and calculating the ratio of the error of the real SOC to the interval length, and taking the ratio as the display SOC precision of the power battery.
7. The method of claim 1, wherein the minimum interval of the true SOC comprises: the minimum interval of the real SOC under the BOL and the minimum interval of the real SOC under the EOL;
the displaying SOC accuracy includes: display SOC accuracy under BOL and display SOC accuracy under EOL.
8. A computing device that displays SOC accuracy, comprising:
the first determining unit is used for determining parameters influencing the real SOC according to a calculation formula of the real SOC of the power battery and determining errors of the parameters;
the first calculating unit is used for calculating the error of the real SOC according to the error of each parameter;
the second determining unit is used for determining a minimum interval of the real SOC for display according to a preset working condition and the discharge power spectrum of the power battery;
and the second calculation unit is used for calculating the display SOC precision of the power battery according to the error of the real SOC and the minimum interval of the real SOC.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of the preceding claims 1 to 7 are implemented when the computer program is executed by the processor.
10. A computer readable storage medium having stored thereon machine executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of any of claims 1 to 7.
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