CN112147513A - Power battery SOC multidimensional calibration method - Google Patents

Power battery SOC multidimensional calibration method Download PDF

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CN112147513A
CN112147513A CN202011012455.7A CN202011012455A CN112147513A CN 112147513 A CN112147513 A CN 112147513A CN 202011012455 A CN202011012455 A CN 202011012455A CN 112147513 A CN112147513 A CN 112147513A
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soc
real
battery
calibration
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张袁元
孟迪
许丽娇
辛江慧
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Nanjing Institute of Technology
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Nanjing Institute of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • 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]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • 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]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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Abstract

The invention discloses a power battery SOC multidimensional calibration method, which comprises the steps of electrifying a power battery; reading initial data; calculating according to the initial data to obtain a table lookup SOC, and further calculating a real SOC; calculating the current battery health degree SOH of the battery according to the accumulated charge-discharge energy, and then calculating the current capacity of the power battery system; calculating a dynamic SOC and carrying out dynamic SOC following calibration; and (3) performing full charge or full discharge calibration and calibration by combining a monomer voltage limit value calibration and a current reduction strategy at the charge and discharge tail end of the power battery system, and finally outputting the calibrated real SOC of the battery system. The method adopts an ampere-hour integral method to calculate the discharging SOC of the power battery, and combines an aging calibration method, a static voltage method table look-up calibration method, a dynamic SOC following calibration method and a terminal monomer voltage limit value calibration and current reduction strategy combination method to carry out multi-dimensional calibration on the real SOC of the power battery, so that the SOC estimation accuracy is improved.

Description

Power battery SOC multidimensional calibration method
Technical Field
The invention relates to the technical field of battery management, in particular to a multi-dimensional SOC calibration method for a power battery.
Background
Since the 21 st century, excessive use and development of petroleum and derived products unbalance the relationship between environmental pollution and energy utilization, and have serious negative effects on society. People urgently need a technical scheme for optimizing the structure of the energy source at the supply side and improving the environment pollution condition. Under such circumstances, electric vehicles are currently the mainstream choice worldwide.
Due to the complexity of the internal State and the external use of the battery (PACK) at present, the SOC (State of Charge/State of Charge) of the battery cannot be directly measured, and can only be estimated through other characterization parameters of the battery, and errors cannot be avoided in the estimation process. The size of the error directly influences the service state and the service life of the power battery.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defect of large SOC estimation error of a battery system in the prior art, the invention discloses a multi-dimensional SOC calibration method for a power battery.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme.
A multi-dimensional calibration method for SOC of a power battery comprises the following steps:
s1: powering on a power battery;
s2: reading initial data: reading clock information, displaying SOC, inspecting battery temperature T, accumulating charge-discharge energy and nominal capacity C of power battery systemratedBattery current and cell voltage;
s3: calculating dynamic parameters of the power battery system: calculating according to the temperature of the inspection battery and the voltage of the single battery to obtain a table lookup SOC, and calculating according to the table lookup SOC and a table lookup method combining conditions to obtain a real SOC; calculating the current battery health degree SOH of the battery according to the accumulated charge and discharge energy, and calculating the current capacity of the power battery system according to the SOH;
s4: and (3) dynamic SOC calculation: calculating discharge energy according to an ampere-hour integral method, and calculating a real-time dynamic SOC in a discharge process by combining the current battery health degree SOH and the real SOC, wherein the dynamic SOC is the real SOC;
s5: dynamic SOC following calibration: judging whether the difference value between the real SOC and the display SOC is smaller than a threshold value, if so, setting the dynamic SOC following permission to be 0, not performing dynamic SOC following calibration, otherwise, setting the dynamic SOC following permission to be 1, and performing SOC dynamic following calibration correction in the discharging process;
s6: the terminal extreme value calibration and the flow reduction strategy are cooperated: and (3) combining a monomer voltage limit value calibration and a current reduction strategy at the charging and discharging tail end of the power battery system to carry out full charging or full discharging calibration on the real SOC and the display SOC of the power battery system, and finally outputting the calibrated real SOC of the battery system.
Preferably, the calculation formula of the current battery health SOH and the current capacity of the power battery system in S3 is as follows:
Figure BDA0002697607730000021
Figure BDA0002697607730000022
Creal＝Crated*SOH
wherein N isratedObtaining a nominal dischargeable number, Q, for a battery systemtotalFor the accumulated discharge energy, Q, of the battery systemratedFor the characteristic parameters of the battery system itself, UbatIs the total voltage of the battery, I is the battery current during the charging and discharging process of the battery, CrealFor the current capacity of the power battery system, CratedFor nominal capacity of power battery systems
Preferably, in S3, the process of calculating and obtaining the table lookup SOC according to the inspection battery temperature and the cell voltage and the process of calculating and obtaining the real SOC according to the table lookup SOC and the table lookup method combining the conditions is a process of performing table lookup calibration by using a static voltage method; the specific process of the static voltage method for performing table look-up calibration comprises the following steps:
s31, battery inspection: acquiring the temperature T and the voltage V of a patrol batterycellBattery current I in the battery charging and discharging process;
s32, obtaining a table lookup SOC: according to the current patrol battery temperature T and the monomer voltage VcellObtaining a table lookup SOC through table lookup;
s33, performing table look-up calibration by a static voltage method: calculating and acquiring the current real SOC (state of charge), namely SOC (state of charge) according to the dormancy duration of the power battery system and the state of the battery by combining a table lookup SOCreal。
Preferably, the specific process of calculating and acquiring the current actual SOC according to the sleep duration of the battery system and the state of the battery in the S33 by combining the table lookup SOC includes:
s331, judging whether the sleeping time is not less than 3 hours or the time when the battery current I is in the continuous I < 5A state is not less than 3 hours, if so, judging the SOC at the momentrealLooking up a table SOC; if not, go to step S332;
s332, judging whether the sleeping time is within the interval of 1-3 hours or the time when the battery current I is in the continuous I < 5A state is within the interval of 1-3 hours, and if not, entering the step S333; if yes, further judging the inequality | SOCout-1.1 table lookup SOC | - | SOCout-0.9. looking up the table SOC | > 0, if true, then SOC is presentrealLooking up a table SOC as 1.1; if not, SOCrealLooking up a table SOC at 0.9; wherein the SOCoutTo display SOC;
s333, when the dormancy time does not exceed 1 hour or the time when the battery current I is in the state of I < 5A is less than 1 hour, the SOC isreal＝SOCout。
Preferably, the dynamic SOC calculation formula in S4 is:
Figure BDA0002697607730000031
Creal＝Crated*SOH
Figure BDA0002697607730000032
wherein I is the current in the charging and discharging process of the battery, CuseThe capacity used up in charging and discharging the battery, CratedFor nominal capacity of battery system, CrealFor the current battery system capacity, the SOH is the battery health, and the SOC in the formula is the dynamic SOC, which is the true SOC.
Preferably, the specific determination process of the dynamic SOC following calibration in S5 is as follows:
s51, acquiring a real SOC and a display SOC, and calculating a difference value between the real SOC and the display SOC;
s52, if the absolute value of the real SOC-display SOC is less than alpha%, the dynamic SOC following is allowed to be set to 0, namely the dynamic following is not allowed; if the absolute value of the real SOC-display SOC is less than alpha%, the dynamic SOC following allowable value is 1, and dynamic following calibration is allowed to be carried out in the discharging process; where α is a first threshold.
Preferably, the S52 performs dynamic following in the discharging process, and the specific process of performing calibration is as follows:
s521, when the dynamic following allowable value is set to 1, the discharging process is dynamically followed and started;
s522, setting the real SOC to be displayed by leveling up when the display SOC is reduced by beta%, and calculating the real-time display SOC according to the display initial value SOC, the real initial value SOC and the discharge electric quantity, wherein the real-time display SOC is the real SOC after dynamic follow calibration; where β is the second threshold.
Preferably, in S522, the specific calculation process of displaying the SOC in real time is as follows:
SOCdisplay/initial-SOCidentical＝β
Figure BDA0002697607730000041
Figure BDA0002697607730000042
where β is the second threshold, SOCdisplay/initialDisplaying an initial value SOC, namely a value of the display SOC read from a memory at the moment of power-on; SOCidenticalIs the SOC when calibrated to a consistent state; SOCreal/initialThe actual initial value SOC is the actual SOC obtained by the table lookup method in step S3; cintervalThe discharge capacity is calibrated to a consistent state SOC; cuseSOCd is the capacity used up in charging and discharging of the batteryisplayThe SOC is displayed in real time.
Preferably, the specific process of calibrating the real SOC at the charge and discharge end by the S6 in combination with the cell voltage limit value calibration method and the current reduction strategy is as follows:
s61, the specific process of discharge end SOC calibration is as follows: according to the characteristics of the single battery cell, the terminal limits the output current of the current by combining with the discharge MAP until the voltage of the discharge single battery cell is limited to the lowest, and the real SOC and the display SOC are forcibly calibrated to 0%;
s62, the specific process of the charging terminal SOC chair calibration is as follows: and (4) according to the special parts of the single battery cell, slightly reducing the current by combining a current reducing spring for charging until the single voltage reaches the highest limit, and forcibly calibrating the real SOC and the display SOC to 100%.
Has the advantages that: the method adopts an ampere-hour integral method to calculate the real value discharging SOC of the power battery, and combines an aging (SOH) calibration method, a static voltage method table look-up calibration method, a dynamic SOC following calibration method and a terminal monomer voltage limit value and current reduction strategy cooperative calibration method to carry out multi-dimensional calibration on the real SOC of the power battery, so that the accuracy of SOC estimation is improved.
Drawings
FIG. 1 is a general process flow diagram of the present invention;
FIG. 2 is a table look-up calibration flow chart of the static voltage method of the present invention;
FIG. 3 is a flow chart of a one time SOC update process of the present invention;
FIG. 4 is a SOC display initial value > SOC true initial value & discharge condition SOC following relationship diagram;
FIG. 5 is a SOC display initial value > SOC true initial value & charging condition SOC following relationship diagram;
FIG. 6 is a SOC display initial value < SOC true initial value & discharge condition SOC tracking relationship diagram;
FIG. 7 is a SOC display initial value < SOC true initial value & charging condition SOC tracking relationship diagram.
Detailed Description
The multi-dimensional SOC calibration method of the power battery is further explained and explained with reference to the accompanying drawings.
As shown in fig. 1, a multidimensional calibration method for SOC of a power battery includes the following steps:
step one, electrifying a power battery;
step two, reading initial data: reading clock information, displaying SOC, inspecting battery temperature T, accumulating charge-discharge energy and nominal capacity C of power battery systemratedBattery current and cell voltage;
step three, calculating dynamic parameters of the power battery system: calculating to obtain a table lookup SOC according to the temperature of the inspection battery and the single voltage, calculating to obtain a real SOC according to the table lookup SOC and a table lookup method combining the table lookup SOC and conditions, calculating the current battery health SOH of the battery according to accumulated charge-discharge energy, and calculating the current capacity of the power battery system according to the SOH, wherein the specific process comprises the following steps:
1. the lookup SOC is obtained by looking up the OCV table.
2. The actual SOC is calculated after logical judgment of the table lookup SOC and the display SOC, and as shown in fig. 2, the following specific steps are performed:
and (3) performing table look-up calibration by combining a static voltage method: as shown in FIG. 2, the current real SOC, namely the SOC, is calculated and obtained according to the sleeping time length range and the state of the batteryreal，
Step 1), judging whether the dormancy duration is not less than 3 hours or not, or the duration of the battery current I in the continuous I < 5A state is not less than 3 hours, if so, judging the SOC at the momentrealThe calculation formula of (2) is as follows: SOCrealLooking up a table SOC; if not, entering the step 2);
step 2), judging whether the dormancy duration is within the interval of 1-3 hours or not, or judging the current of the batteryThe duration of the continuous I < 5A state is within the interval of 1 hour to 3 hours, if not, the step 3) is carried out; if yes, further judging whether the formula (1) is established, if yes, then the SOC is carried out at the momentrealThe calculation formula of (2) is as follows: SOCrealLooking up a table SOC as 1.1; if not, SOCrealLooking up a table SOC at 0.9; the formula (1) is:
|SOCout-1.1 table lookup SOC | - | SOCout-0.9 table SOC | > 0 (1)
Wherein, SOCoutTo display SOC;
step 3), when the dormancy time is less than 1 hour, or the time when the battery current I is in the state of I < 5A is less than 1 hour, the SOC is determinedrealThe calculation formula of (2) is as follows: SOCreal＝SOCout；
3. Calculation of SOH:
Figure BDA0002697607730000061
wherein N isratedObtaining the nominal dischargeable times for the battery system, determining the characteristics of the power battery system, and providing N by the power battery manufacturerratedValues of (d) are generally between 1500-3500; qtotalFor the accumulated discharge energy of the battery system, the battery is calculated and obtained in real time in the using process, QratedThe characteristic parameters of the battery system are given by a battery production designer;
4. calculating the accumulated discharge energy of the battery system:
Figure BDA0002697607730000062
wherein, UbatThe total voltage of the battery is detected by the BMS; i is the battery current in the battery charging and discharging process;
5. calculating the current capacity of the power battery system:
Creal＝CratedSOH (4) wherein, CrealIs the current capacity of the power battery system.
Step four, calculating the dynamic SOC: and calculating the discharge energy according to an ampere-hour integral method, and then calculating the real-time SOC in the discharge process by combining the current battery health degree SOH and the real SOC, wherein the real-time SOC is the real SOC. The calculation formula is as follows:
Figure BDA0002697607730000071
Creal＝Crated*SOH (6)
Figure BDA0002697607730000072
wherein: i is the battery current during charging and discharging of the battery, CuseFor the capacity used during discharge of the battery, CratedFor nominal capacity of battery system, CrealIs the current power battery system capacity.
Judging whether SOC dynamic following is performed or not, and judging whether the dynamic following is started or not: as shown in fig. 3, it is determined whether formula (8) is satisfied, if not, a dynamic SOC following state is entered, and if the dynamic SOC following is allowed to be set to 1, the SOC is corrected by combining a terminal cell voltage limit value calibration method in a SOC updating processrealCarrying out calibration; if yes, the dynamic SOC following state is not entered, and the dynamic SOC following permission is set to 0; equation (2) is SOCealAnd display value SOCoutThe error between the two is calculated, and the specific content of the formula (8) is:
|SOCreal-SOCout|＜α％ (8)
equation (8) is true SOC, i.e., SOCrealAnd display SOC namely SOCoutA judgment formula for judging whether the difference value is smaller than a first threshold value; where α is the first threshold, where the first threshold is taken to be 2%.
Dynamic SOC follows turn on: when the dynamic following allowable value is 1, the discharge process is dynamically followed and started; setting that when the display SOC is reduced by beta%, the real SOC is leveled up to display the SOC, and calculating a real-time display SOC according to the display initial value SOC, the real initial value SOC and the discharge electric quantity, wherein the real-time display SOC is the real SOC after dynamic follow calibration; where β is the second threshold. The real-time calculation process of the display SOC, namely the calculation formula of the calibration of the real SOC is as follows:
SOCdisplay/initial-SOCidentical＝β (9)
Figure BDA0002697607730000081
Figure BDA0002697607730000082
where β is the second threshold, SOCdisplay/initialFor indicating initial value SOC, i.e. SOC read from memory at power-on instantoutA value; SOCidenticalIn order to calibrate the SOC to the consistent state, the scheme is set to predict that the real SOC is consistent with the real-time display SOC when the display initial value SOC is reduced by a second threshold value beta; SOCreal/initialThe actual initial value SOC after the static calibration, that is, the actual SOC obtained by the table lookup method in step S3; cintervalThe discharge capacity is calculated from the formula when the SOC is calibrated to be in a consistent state; cuseFor the capacity, SOC, used up in charging and discharging the batterydisplayAnd displaying the SOC in real time, wherein the real-time displayed SOC is the real SOC after dynamic follow-up calibration.
Step six, the terminal extreme value calibration and the flow reduction strategy are cooperated: and (3) combining a monomer voltage limit value calibration and a current reduction strategy at the charging and discharging tail end of the power battery system to carry out full charging or full discharging calibration on the real SOC and the display SOC of the power battery system, and finally outputting the calibrated real SOC of the battery system.
Step 6.1, the discharge end SOC calibration is cooperatively calibrated by combining a monomer voltage limit state and current limit: the specific process of the discharge end SOC calibration is as follows: according to the characteristics of the single battery cell, the tail end of the single battery cell is combined with the discharging MAP to limit the output current of the current until the discharging single battery cell is limited to the lowest voltage, and the SOC is forcibly calibrated to 0%.
Step 6.2, the SOC of the charging tail end is calibrated by combining a single voltage limit state with a current reduction strategy: the specific process of the SOC calibration at the charging end comprises the following steps: and (4) reducing current for charging by combining a current reduction strategy according to the characteristics of the single battery cell until the single voltage reaches the highest limit, and forcibly calibrating the SOC to 100%.
The method adopts an ampere-hour integral method to calculate the real SOC of the power battery, and combines an aging calibration method, a static voltage method table look-up calibration method, a dynamic SOC following calibration method and a terminal monomer voltage limit value and current reduction strategy cooperative calibration method to carry out multi-dimensional calibration on the real SOC of the power battery, so that the SOC estimation accuracy is improved.
In the dynamic tracking calibration, the relationship between the displayed SOC and the real SOC is shown in the attached figures 4-7:
fig. 4 is a graph showing the following relationship between the initial value SOC > real initial value SOC and the discharging condition SOC, aiming at representing the following relationship between the real SOC after calibration and the real SOC without calibration at the moment of power-on and the SOC > real SOC and under the discharging condition.
Fig. 5 shows a following relationship diagram of initial value SOC > true initial value SOC & charging condition SOC, aiming at representing the following relationship between the true SOC after calibration and the true SOC without calibration at the moment of power-on and at the charging condition.
Fig. 6 shows a following relationship diagram of initial value SOC < true initial value SOC & discharging condition SOC, aiming at representing the following relationship between the true SOC after calibration and the true SOC without calibration under the discharging condition at the moment of power-on.
FIG. 7 shows a following relationship diagram of initial value SOC < true initial value SOC & charging condition SOC. The method aims to display the following relation between the calibrated real SOC and the uncalibrated real SOC at the moment of power-on when the SOC is less than the real SOC under the charging working condition.
In fig. 4 to 7, the misalignment shows that the SOC value is the SOC discharge estimation theoretically not calibrated, the misaligned true SOC value is the theoretically misaligned true SOC discharge estimation, and the calibrated true SOC value is the theoretically calibrated SOC discharge estimation.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (9)

1. A multi-dimensional calibration method for SOC of a power battery is characterized by comprising the following steps:
s1: powering on a power battery;
s2: reading initial data: reading clock information, displaying SOC, inspecting battery temperature T, accumulating charge-discharge energy and nominal capacity C of power battery systemratedBattery current and cell voltage;
s3: calculating dynamic parameters of the power battery system: calculating according to the temperature of the inspection battery and the voltage of the single battery to obtain a table lookup SOC, and calculating according to the table lookup SOC and a table lookup method combining conditions to obtain a real SOC; calculating the current battery health degree SOH of the battery according to the accumulated charge and discharge energy, and calculating the current capacity of the power battery system according to the SOH;
s4: and (3) dynamic SOC calculation: calculating discharge energy according to an ampere-hour integral method, and calculating a real-time dynamic SOC in a discharge process by combining the current battery health degree SOH and the real SOC, wherein the dynamic SOC is the real SOC;
s5: dynamic SOC following calibration: judging whether the difference value between the real SOC and the display SOC is smaller than a threshold value, if so, setting the dynamic SOC following permission to be 0, not performing dynamic SOC following calibration, otherwise, setting the dynamic SOC following permission to be 1, and performing SOC dynamic following calibration correction in the discharging process;
s6: the terminal extreme value calibration and the flow reduction strategy are cooperated: and (3) combining a monomer voltage limit value calibration and a current reduction strategy at the charging and discharging tail end of the power battery system to carry out full charging or full discharging calibration on the real SOC and the display SOC of the power battery system, and finally outputting the calibrated real SOC of the battery system.
2. The multi-dimensional calibration method for the SOC of the power battery as claimed in claim 1, wherein the calculation formula of the current battery health (SOH) of the battery and the current capacity of the power battery system in S3 is as follows:
Figure FDA0002697607720000011
Figure FDA0002697607720000012
Creal＝Crated*SOH
wherein N isratedObtaining a nominal dischargeable number, Q, for a battery systemtotalFor the accumulated discharge energy, Q, of the battery systemratedFor the characteristic parameters of the battery system itself, UbatIs the total voltage of the battery, I is the battery current during the charging and discharging process of the battery, CrealFor the current capacity of the power battery system, CratedIs the nominal capacity of the power battery system.
3. The multi-dimensional calibration method for the SOC of the power battery according to claim 1, wherein in the step S3, the processes of obtaining the SOC by table lookup through calculation according to the inspection battery temperature and the cell voltage and obtaining the real SOC through calculation according to the SOC by table lookup combined with the condition table lookup are processes of performing table lookup calibration for a static voltage method; the specific process of the static voltage method for performing table look-up calibration comprises the following steps:
s31, battery inspection: acquiring the temperature T and the voltage V of a patrol batterycellBattery current I in the battery charging and discharging process;
s32, obtaining a table lookup SOC: according to the current patrol battery temperature T and the monomer voltage VcellObtaining a table lookup SOC through table lookup;
s33, performing table look-up calibration by a static voltage method: calculating and acquiring the current real SOC (state of charge), namely SOC (state of charge) according to the dormancy duration of the power battery system and the state of the battery by combining a table lookup SOCreal。
4. The multi-dimensional calibration method for the SOC of the power battery according to claim 3, wherein the specific process of obtaining the current true SOC through combination of table lookup SOC and the state of the battery according to the resting time of the battery system in S33 comprises:
s331, judging whether the sleeping time is not less than 3 hours or the time when the battery current I is in the continuous I < 5A state is not less than 3 hours, if so, judging the SOC at the momentrealLooking up a table SOC; if not, go to step S332;
s332, judging whether the sleeping time is within the interval of 1-3 hours or the time when the battery current I is in the continuous I < 5A state is within the interval of 1-3 hours, and if not, entering the step S333; if yes, further judging the inequality | SOCout-1.1 table lookup SOC | - | SOCout-0.9. looking up the table SOC | > 0, if true, then SOC is presentrealLooking up a table SOC as 1.1; if not, SOCrealLooking up a table SOC at 0.9; wherein the SOCoutTo display SOC;
s333, when the dormancy time does not exceed 1 hour or the time when the battery current I is in the state of I < 5A is less than 1 hour, the SOC isreal＝SOCout。
5. The multidimensional calibration method for the SOC of the power battery according to claim 1, wherein the dynamic SOC calculation formula in S4 is as follows:
Figure FDA0002697607720000031
Creal＝Crated*SOH
Figure FDA0002697607720000032
wherein I is the current in the charging and discharging process of the battery, CuseThe capacity used up in charging and discharging the battery, CratedFor nominal capacity of battery system, CrealFor the current battery system capacity, the SOH is the battery health, and the SOC in the formula is the dynamic SOC, which is the true SOC.
6. The multi-dimensional power battery SOC calibration method according to claim 1, wherein the specific determination process of the dynamic SOC following calibration in S5 is as follows:
s51, acquiring a real SOC and a display SOC, and calculating a difference value between the real SOC and the display SOC;
s52, if the absolute value of the real SOC-display SOC is less than alpha%, the dynamic SOC following is allowed to be set to 0, namely the dynamic following is not allowed; if the absolute value of the real SOC-display SOC is less than alpha%, the dynamic SOC following allowable value is 1, and dynamic following calibration is allowed to be carried out in the discharging process; where α is a first threshold.
7. The multi-dimensional calibration method for the SOC of the power battery according to claim 6, wherein the S52 is dynamically followed in a discharging process, and the specific process of calibration is as follows:
s521, when the dynamic following allowable value is set to 1, the discharging process is dynamically followed and started;
s522, setting the real SOC to be displayed by leveling up when the display SOC is reduced by beta%, and calculating the real-time display SOC according to the display initial value SOC, the real initial value SOC and the discharge electric quantity, wherein the real-time display SOC is the real SOC after dynamic follow calibration; where β is the second threshold.
8. The multidimensional calibration method for the SOC of the power battery according to claim 7, wherein in the step S522, a specific calculation process for displaying the SOC in real time is as follows:
SOCdisplay/initial-SOCidentical＝β
Figure FDA0002697607720000041
Figure FDA0002697607720000042
where β is the second threshold, SOCdisplay/initialDisplaying an initial value SOC, namely a value of the display SOC read from a memory at the moment of power-on; SOCidenticalThe real SOC is calibrated to be in a consistent state, and in the consistent state, the real SOC is the display SOC; SOCreal/initialThe actual initial value SOC is the actual SOC obtained by the table lookup method in step S3; cintervalThe discharge capacity is calibrated to a consistent state SOC; cuseFor the capacity, SOC, used up in charging and discharging the batterydisplayThe SOC is displayed in real time.
9. The multi-dimensional calibration method for the SOC of the power battery according to claim 1, wherein the specific process of calibrating the true SOC at the charge and discharge end by the S6 in combination with the cell voltage limit value calibration method and the current reduction strategy is as follows:
s61, discharge end SOC calibration: according to the characteristics of the single battery cell, the terminal limits the output current of the current by combining with the discharge MAP until the voltage of the discharge single battery cell is limited to the lowest, and the real SOC and the display SOC are forcibly calibrated to 0%;
s62, the specific process of the SOC calibration at the charging end is as follows: and (4) reducing current for charging by combining a current reduction strategy according to the characteristics of the single battery cell until the single voltage reaches the highest limit, and forcibly calibrating the real SOC and the display SOC to 100%.
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