CN114035049A - SOH precision calculation method and device and electronic equipment - Google Patents
SOH precision calculation method and device and electronic equipment Download PDFInfo
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Abstract
The invention provides a method and a device for calculating SOH precision and electronic equipment, wherein the method comprises the following steps: acquiring a battery degradation model calculation formula and a current battery performance calculation formula of the power battery; testing by adopting a real vehicle under a preset working condition to obtain a real SOH value; determining to obtain a first SOH error of the power battery based on a battery degradation model calculation formula and a real SOH value; determining parameters influencing SOH in a current battery performance calculation formula, and determining errors of the parameters; calculating a second SOH error of the power battery based on the errors of the parameters; and taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery. The SOH accuracy calculation method can calculate the SOH accuracy, and the maximum value of the first SOH error determined based on the battery degradation model calculation formula and the second SOH error determined based on the current battery performance calculation formula is used as the SOH accuracy of the power battery, so that the determined SOH accuracy is more accurate.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a method and a device for calculating SOH (sequence of events) precision and electronic equipment.
Background
The power battery is one of three large core components of the electric automobile, and plays an important role in performance of the electric automobile. With the continuous use of the power battery, the available capacity of the power battery is continuously reduced, and according to the indication in most of the existing external standards of vehicle enterprises, when the available capacity of the power battery is reduced to 80% of that of a new battery, the service life of the power battery is considered to reach the replacement standard. The capacity information of the power battery can be reflected by a state of health (SOH) value, that is, accurately acquiring the SOH value is the key for accurately judging the service life and the aging degree of the power battery. The accurate acquisition of the SOH value greatly helps to timely overhaul and replace the power battery. Meanwhile, the SOH value of the electric vehicle is a basis for calculating the state of charge (SOC) of the power battery. The estimation of the driving range of the electric vehicle needs to be carried out according to the SOC value, and the accuracy of obtaining the SOH value determines the accuracy of calculating the SOC value, so the accuracy of obtaining the SOH also influences the accuracy of estimating the driving range of the electric vehicle.
Currently, acquisition of the SOH value is mostly performed by a Battery Management System (BMS). However, the obtained SOH value has a certain error, which requires evaluating the accuracy of the SOH value, obtaining the accuracy of the SOH, and determining the SOH range according to the obtained SOH accuracy, so as to apply the SOH range to the accurate determination of various subsequent parameters.
In the prior art, the SOH accuracy cannot be calculated, so a method for calculating the SOH accuracy is urgently needed.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus, and an electronic device for calculating SOH accuracy, so as to alleviate the technical problem that the SOH accuracy cannot be calculated in the prior art.
In a first aspect, the present invention provides a method for calculating SOH accuracy, including:
acquiring a battery degradation model calculation formula and a current battery performance calculation formula of the power battery;
testing by adopting a real vehicle under a preset working condition to obtain a real SOH value;
determining to obtain a first SOH error of the power battery based on the battery degradation model calculation formula and the real SOH value;
determining parameters influencing SOH in the current battery performance calculation formula, and determining errors of the parameters;
calculating a second SOH error of the power battery based on the errors of the parameters;
and taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery.
Further, the curve is a mileage-SOH curve, and the real vehicle is adopted to perform testing under a preset working condition, including:
carrying out initial discharge capacity test on the real vehicle to obtain the initial discharge capacity of the real vehicle;
operating the real vehicle according to the preset working condition, and testing the discharge capacity of the operated real vehicle to obtain the discharge capacity after operation;
and calculating to obtain the real SOH value of the power battery under each mileage according to the initial discharge capacity and the discharge capacity after operation.
Further, determining a first SOH error of the power battery based on the battery degradation model calculation equation and the true SOH value includes:
calculating a simulated SOH value under each target mileage according to the battery degradation model calculation formula, wherein each target mileage is each mileage corresponding to the real SOH value;
and calculating the first SOH error according to the real SOH value under each mileage and the corresponding simulated SOH value under each mileage.
Further, if the error of each parameter includes: BMS current measurement error, SOC-OCV maximum error under BOL, capacity error, the error of confirming each parameter includes:
determining the BMS current measurement error according to the accuracy of the current sensor;
determining a maximum SOC variation value corresponding to a preset pressure difference according to a battery cell SOC-OCV corresponding relation under BOL, and further obtaining a maximum SOC-OCV error;
calculation formula based on capacity error
Calculating the capacity error, wherein Δ Q represents the capacity error, Qmax represents the maximum capacity in all the cells, and Qave represents the median of the minimum capacity Qmin and the maximum capacity in all the cells.
Further, calculating a second SOH error of the power battery based on the error of each parameter, including:
calculating the equation Delta SOH according to the second SOH error2＝(1+ΔI)*(1+ΔSOCocv) (1+ Δ Q) -1 calculating the second SOH error, wherein Δ SOH2Represents the second SOH error, Δ I represents the BMS current measurement error, Δ SOCocvRepresents the SOC-OCV maximum error, and Δ Q represents the capacity error.
Further, the battery degradation model calculation formula is obtained by fitting a numerical value obtained after a real vehicle with a target power battery is operated according to a preset working condition.
Further, the current battery performance calculation equation includes:
i represents the discharge current, Δ t represents the discharge time, Q represents the nominal capacity, SOCocv1-SOCocv0Representing the difference of the SOC corresponding to different voltages.
In a second aspect, an embodiment of the present invention further provides an SOH accuracy calculation apparatus, including:
the battery degradation model calculation formula of the power battery and the current battery performance calculation formula are obtained;
the testing unit is used for testing by adopting a real vehicle under a preset working condition to obtain a real SOH value;
a first determination unit for determining a first SOH error of the power battery based on the battery degradation model calculation equation and the real SOH value;
the second determining unit is used for determining parameters influencing SOH in the current battery performance calculation formula and determining errors of the parameters;
the calculating unit is used for calculating a second SOH error of the power battery based on the error of each parameter;
and the setting unit is used for taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery.
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 method for calculating an SOH accuracy is provided, including: acquiring a battery degradation model calculation formula and a current battery performance calculation formula of the power battery; testing by adopting a real vehicle under a preset working condition to obtain a real SOH value; determining to obtain a first SOH error of the power battery based on a battery degradation model calculation formula and a real SOH value; determining parameters influencing SOH in the current battery performance calculation formula so as to determine errors of the parameters; further, calculating a second SOH error of the power battery based on the error of each parameter; and finally, taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery. As can be seen from the above description, the SOH accuracy calculation method of the present invention can calculate the SOH accuracy, and the maximum value of the first SOH error determined based on the battery degradation model calculation formula and the second SOH error determined based on the current battery performance calculation formula is used as the SOH accuracy of the power battery, so that the determined SOH accuracy is more accurate, and the technical problem that the SOH accuracy cannot be calculated in the prior art is solved.
Drawings
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 flow chart of a method for calculating SOH accuracy according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a test performed by a real vehicle under a predetermined condition according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an apparatus for calculating SOH accuracy according to an embodiment of the present invention;
fig. 4 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 SOH value is mostly completed by a Battery Management System (BMS), however, the obtained SOH value has a certain error, and the SOH accuracy cannot be evaluated.
Therefore, the SOH accuracy calculation method can calculate the SOH accuracy, and the maximum value of the first SOH error determined based on the battery degradation model calculation formula and the second SOH error determined based on the current battery performance calculation formula is used as the SOH accuracy of the power battery, so that the determined SOH accuracy is more accurate.
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 of SOH accuracy, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a flowchart of a method for calculating SOH accuracy according to an embodiment of the present invention, as shown in fig. 1, the method includes the steps of:
step S102, acquiring a battery degradation model calculation formula and a current battery performance calculation formula of the power battery;
the battery degradation model calculation formula is obtained by fitting numerical values obtained after running a real vehicle with a target power battery according to preset working conditions. The target power battery may be a power battery composed of battery cells with relatively poor capacity deviation, and then, a preset typical working condition is designed, for example, the working condition may be: the method comprises the following steps that a client goes to work in the morning, has a rest in the noon, goes to work in the afternoon, and is charged in the evening, in the process, charging and discharging (how much power is discharged when the client is driven in the morning, how long the client is charged and the like) and storage are involved, the charging and discharging SOH attenuation fitting and the storage SOH attenuation fitting are carried out, and for the medium-sized power battery, the calculation formula of a cycle SOH degradation model obtained through fitting is as follows:
ah represents ampere-hour of charge and discharge, and T represents temperature;
the calculation formula of the stored SOH degradation model obtained by fitting is:
t represents temperature, SOC represents SOC at the time of storage, and Hour represents time.
The current battery performance calculation includes:
i represents the discharge current, Δ t represents the discharge time, Q represents the nominal capacity, SOCocv1-SOCocv0Representing the difference of the SOC corresponding to different voltages.
Step S104, testing by adopting a real vehicle under a preset working condition to obtain a real SOH value;
step S106, determining to obtain a first SOH error of the power battery based on a battery degradation model calculation formula and a real SOH value;
step S108, determining parameters influencing SOH in the current battery performance calculation formula, and determining errors of the parameters;
specifically, the current calculation formula of battery performance includes:
it is known that parameters that influence SOH include: I. q and SOCocv1-SOCocv0Further, the error of each parameter is determined.
Step S110, calculating a second SOH error of the power battery based on the errors of all parameters;
and step S112, taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery.
In practical application, the SOH accuracy of the power battery is generally required to be less than 10%, and after the SOH accuracy is obtained through calculation, whether the SOH accuracy is less than 10% is further determined, so that whether the power battery meets industrial requirements is further determined.
In an embodiment of the present invention, a method for calculating an SOH accuracy is provided, including: acquiring a battery degradation model calculation formula and a current battery performance calculation formula of the power battery; testing by adopting a real vehicle under a preset working condition to obtain a real SOH value; determining to obtain a first SOH error of the power battery based on a battery degradation model calculation formula and a real SOH value; determining parameters influencing SOH in the current battery performance calculation formula so as to determine errors of the parameters; further, calculating a second SOH error of the power battery based on the error of each parameter; and finally, taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery. As can be seen from the above description, the SOH accuracy calculation method of the present invention can calculate the SOH accuracy, and the maximum value of the first SOH error determined based on the battery degradation model calculation formula and the second SOH error determined based on the current battery performance calculation formula is used as the SOH accuracy of the power battery, so that the determined SOH accuracy is more accurate, and the technical problem that the SOH accuracy cannot be calculated in the prior art is solved.
The above description briefly introduces the SOH accuracy calculation method of the present invention, and the details thereof will be described in detail below.
In an optional embodiment of the present invention, referring to fig. 2, the step S104 mentioned above, the testing is performed by using a real vehicle under a preset working condition, and specifically includes the following steps:
step S201, carrying out an initial discharge capacity test on the real vehicle to obtain the initial discharge capacity of the real vehicle;
the above initial discharge capacity was recorded as: q0。
Step S202, operating the real vehicle according to a preset working condition, and testing the discharge capacity of the operated real vehicle to obtain the discharge capacity after operation;
the discharge capacity after the run was recorded as: q1。
And step S203, calculating to obtain the real SOH value of the power battery under each mileage according to the initial discharge capacity and the discharge capacity after operation.
The true SOH value is Q1/Q0。
In an optional embodiment of the present invention, in the step S106, determining the first SOH error of the power battery based on the battery degradation model calculation formula and the true SOH value specifically includes the following steps:
calculating a simulated SOH value under each target mileage according to a battery degradation model calculation formula, wherein each target mileage is each mileage corresponding to a real SOH value; and calculating a first SOH error according to the real SOH value under each mileage and the corresponding simulated SOH value under each mileage.
In particular, the method comprises the following steps of,
wherein, SOHReality, siRepresenting the true SOH value, SOH, at si mileageSimulation, siThe simulated SOH value at si mileage is represented.
Calculating the first SOH error of the middle-navigation power battery to obtain a first SOH error delta SOH1＝0.1％。
In an alternative embodiment of the invention, if the error of each parameter comprises: BMS current measurement error, SOC-OCV maximum error under BOL, capacity error, confirm the error of each parameter, specifically include the following step:
(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) Determining a maximum SOC variation value corresponding to a preset pressure difference according to a battery cell SOC-OCV corresponding relation under BOL, and further obtaining a maximum SOC-OCV error;
BOL denotes an initially discharged cell, i.e., a new cell. 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 battery cell SOC-OCV corresponding relationship under BOL is obtained first, the corresponding relationship is given by a manufacturer before the battery cells leave a factory, and specifically, the corresponding relationship may be an OCV value corresponding to 5% SOC at each 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 cell SOC-OCV under BOL corresponds to SOC1 being 30%, OCV1 being 3.6, SOC2 being 35%, and OCV2 being 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, thereby obtaining the corresponding SOC variation value.
In the embodiment of the invention, the maximum error of the determined SOC-OCV is 1.6% for the power battery in mid-range.
(3) Calculation formula based on capacity error
And calculating to obtain a capacity error, wherein Δ Q represents the capacity error, Qmax represents the maximum capacity in all the cells, and Qave represents the median value of the minimum capacity Qmin and the maximum capacity in all the cells.
Specifically, the battery cell capacity range Qmin is 52Ah, which is obtained by counting the factory capacity distribution of 100 ten thousand battery cells in the middle aviation; qmax is 55 Ah; qave is 53.5Ah, capacity error (55-53.5)/53.5 is 2.8%.
In an optional embodiment of the present invention, in step 110, calculating a second SOH error of the power battery based on the error of each parameter includes:
calculating the equation Delta SOH according to the second SOH error2＝(1+ΔI)*(1+ΔSOCocv) (1+ Δ Q) -1 calculating a second SOH error, wherein Δ SOH2Representing the second SOH error,. DELTA.I representing the BMS current measurement error,. DELTA.SOCocvRepresents the maximum SOC-OCV error and Δ Q represents the capacity error.
Specifically, the numerical value obtained in the above is substituted into the second SOH error calculation formula to obtain Δ SOH2＝(1+0.5％)*(1+1.6％)*(1+2.8％)-1＝5％。
Comparing the first SOH error Δ SOH1And a second SOH error Δ SOH2The SOH accuracy of the power battery can be obtained as5％。
The calculation method of the SOH precision can calculate the SOH precision, fully considers the error of the calculation formula of the battery degradation model and the error of the calculation formula of the current battery performance in the calculation process, is more scientific, and has more accurate calculated SOH precision and more accurate subsequent SOH determined based on the SOH precision.
Example two:
the embodiment of the present invention further provides a calculation apparatus for SOH accuracy, which is mainly used for executing the calculation method for SOH accuracy provided in the first embodiment of the present invention, and the following provides a specific description of the calculation apparatus for SOH accuracy provided in the first embodiment of the present invention.
Fig. 3 is a schematic diagram of an SOH accuracy calculation apparatus according to an embodiment of the present invention, as shown in fig. 3, the apparatus mainly includes: an acquisition unit 10, a test unit 20, a first determination unit 30, a second determination unit 40, a calculation unit 50 and a setting unit 60, wherein:
the battery degradation model calculation formula of the power battery and the current battery performance calculation formula are obtained;
the testing unit is used for testing by adopting a real vehicle under a preset working condition to obtain a real SOH value;
a first determination unit for determining a first SOH error of the power battery based on the battery degradation model calculation formula and the real SOH value;
the second determining unit is used for determining parameters influencing SOH in the current battery performance calculation formula and determining errors of the parameters;
the calculating unit is used for calculating a second SOH error of the power battery based on the error of each parameter;
and the setting unit is used for taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery.
In an embodiment of the present invention, there is provided a calculation apparatus of SOH accuracy, including: acquiring a battery degradation model calculation formula and a current battery performance calculation formula of the power battery; testing by adopting a real vehicle under a preset working condition to obtain a real SOH value; determining to obtain a first SOH error of the power battery based on a battery degradation model calculation formula and a real SOH value; determining parameters influencing SOH in the current battery performance calculation formula so as to determine errors of the parameters; further, calculating a second SOH error of the power battery based on the error of each parameter; and finally, taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery. As can be seen from the above description, the SOH accuracy calculation device according to the present invention can calculate the SOH accuracy, and the maximum value of the first SOH error determined based on the battery degradation model calculation formula and the second SOH error determined based on the current battery performance calculation formula is used as the SOH accuracy of the power battery, so that the determined SOH accuracy is more accurate, and the technical problem that the SOH accuracy cannot be calculated in the prior art is solved.
Optionally, the test unit is further configured to: testing the initial discharge capacity of the real vehicle to obtain the initial discharge capacity of the real vehicle; operating the real vehicle according to a preset working condition, and testing the discharge capacity of the operated real vehicle to obtain the discharge capacity after operation; and calculating to obtain the real SOH value of the power battery under each mileage according to the initial discharge capacity and the discharge capacity after operation.
Optionally, the first determining unit is further configured to: calculating a simulated SOH value under each target mileage according to a battery degradation model calculation formula, wherein each target mileage is each mileage corresponding to a real SOH value; and calculating a first SOH error according to the real SOH value under each mileage and the corresponding simulated SOH value under each mileage.
Optionally, if the error of each parameter includes: BMS current measurement error, SOC-OCV maximum error under BOL, capacity error, the second determination unit is still used for: determining BMS current measurement errors according to the precision of the current sensor; determining a maximum SOC variation value corresponding to a preset pressure difference according to a battery cell SOC-OCV corresponding relation under BOL, and further obtaining a maximum SOC-OCV error; calculation formula based on capacity error
Calculating a capacity error, wherein Δ Q represents a capacity errorIn difference, Qmax represents the maximum capacity in all cells, and Qave represents the median of the minimum capacity Qmin and the maximum capacity in all cells.
Optionally, the computing unit is further configured to: calculating the equation Delta SOH according to the second SOH error2＝(1+ΔI)*(1+ΔSOCocv) (1+ Δ Q) -1 calculating a second SOH error, wherein Δ SOH2Representing the second SOH error,. DELTA.I representing the BMS current measurement error,. DELTA.SOCocvRepresents the maximum SOC-OCV error and Δ Q represents the capacity error.
Optionally, the battery degradation model calculation formula is obtained by fitting a numerical value obtained after running the real vehicle with the target power battery according to a preset working condition.
Optionally, the current battery performance calculation includes:
i represents the discharge current, Δ t represents the discharge time, Q represents the nominal capacity, SOCocv1-SOCocv0Representing the difference of the SOC corresponding to different voltages.
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. 4, 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 of SOH accuracy as described above.
Specifically, the memory 602 and the processor 601 can be general-purpose memories and processors, which are not specifically limited herein, and the SOH accuracy calculation method can be performed when the processor 601 runs a 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 SOH accuracy calculation method, 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 SOH accuracy calculation method.
The SOH-accuracy calculating device provided by the embodiment of the present application may be specific hardware on the device, or software or firmware installed on the device. 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 of SOH accuracy is characterized by comprising the following steps:
acquiring a battery degradation model calculation formula and a current battery performance calculation formula of the power battery;
testing by adopting a real vehicle under a preset working condition to obtain a real SOH value;
determining to obtain a first SOH error of the power battery based on the battery degradation model calculation formula and the real SOH value;
determining parameters influencing SOH in the current battery performance calculation formula, and determining errors of the parameters;
calculating a second SOH error of the power battery based on the errors of the parameters;
and taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery.
2. The method of claim 1, wherein the testing is performed using a real vehicle under predetermined operating conditions, comprising:
carrying out initial discharge capacity test on the real vehicle to obtain the initial discharge capacity of the real vehicle;
operating the real vehicle according to the preset working condition, and testing the discharge capacity of the operated real vehicle to obtain the discharge capacity after operation;
and calculating to obtain the real SOH value of the power battery under each mileage according to the initial discharge capacity and the discharge capacity after operation.
3. The method of claim 2, wherein determining a first SOH error for the power cell based on the cell degradation model calculation equation and the true SOH value comprises:
calculating a simulated SOH value under each target mileage according to the battery degradation model calculation formula, wherein each target mileage is each mileage corresponding to the real SOH value;
and calculating the first SOH error according to the real SOH value under each mileage and the corresponding simulated SOH value under each mileage.
4. The method of claim 1, wherein if the error for each parameter comprises: BMS current measurement error, SOC-OCV maximum error under BOL, capacity error, the error of confirming each parameter includes:
determining the BMS current measurement error according to the accuracy of the current sensor;
determining a maximum SOC variation value corresponding to a preset pressure difference according to a battery cell SOC-OCV corresponding relation under BOL, and further obtaining a maximum SOC-OCV error;
calculation formula based on capacity error
Calculating the capacity error, wherein Δ Q represents the capacity error, Qmax represents the maximum capacity in all the cells, and Qave represents the median of the minimum capacity Qmin and the maximum capacity in all the cells.
5. The method of claim 4, wherein calculating a second SOH error of the power cell based on the error of the parameters comprises:
calculating the equation Delta SOH according to the second SOH error2＝(1+ΔI)*(1+ΔSOCocv) (1+ Δ Q) -1 calculating the second SOH error, wherein Δ SOH2Represents the second SOH error, Δ I represents the BMS current measurement error, Δ SOCocvRepresents the SOC-OCV maximum error, Δ Q represents the capacity error.
6. The method according to claim 1, wherein the battery degradation model calculation formula is obtained by fitting a numerical value obtained after running a real vehicle with a target power battery according to a preset working condition.
7. The method of claim 1, wherein the current battery performance calculation comprises:
i represents the discharge current, Δ t represents the discharge time, Q represents the nominal capacity, SOCocv1-SOCocv0Representing the difference of the SOC corresponding to different voltages.
8. An SOH accuracy calculation apparatus, comprising:
the battery degradation model calculation formula of the power battery and the current battery performance calculation formula are obtained;
the testing unit is used for testing by adopting a real vehicle under a preset working condition to obtain a real SOH value;
a first determination unit for determining a first SOH error of the power battery based on the battery degradation model calculation equation and the real SOH value;
the second determining unit is used for determining parameters influencing SOH in the current battery performance calculation formula and determining errors of the parameters;
the calculating unit is used for calculating a second SOH error of the power battery based on the error of each parameter;
and the setting unit is used for taking the maximum value of the first SOH error and the second SOH error as the SOH accuracy of the power battery.
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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