CN110658466A - Method for calculating residual capacity of storage battery - Google Patents
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Abstract
The invention discloses a method for calculating the residual capacity of a storage battery, which is characterized in that while the SOC is calculated by adopting ampere-hour integration in the whole life cycle of the battery, the SOC is corrected by utilizing the cut-off voltage when the battery is fully charged or discharged and utilizing an open-circuit voltage method in a non-platform area of the battery voltage, so that the accumulated error of the ampere-hour integration is eliminated, and more accurate residual capacity is obtained.
Description
Technical Field
The invention relates to the technical field of battery management systems, in particular to a method for calculating the residual capacity of a storage battery.
Background
In order to deal with the energy crisis, various countries and vehicle enterprises have successively announced the time for stopping production and selling fuel vehicles, and the development of electric vehicles is supported fully. In an electric vehicle, the consistency of the cruising ability of batteries is a focus of attention, and the state of charge (SOC), namely the accuracy of estimation of the remaining available electric quantity of the batteries, affects the control strategy of the whole vehicle. The optimization research of the SOC calculation method is a hotspot and difficulty of the current battery technology research.
Currently, the commonly used SOC estimation methods include: ampere-hour integration method, open-circuit voltage method, Kalman filtering method, BP neural network method, etc. The disadvantages of the prior method are that:
1) the ampere-hour integration method has strong dependence on an accurate initial value of the SOC, has high precision requirement on current acquisition equipment, ignores the change of the internal resistance of the battery and generates larger accumulated error along with the time;
2) the open circuit voltage method requires a long time for battery standing and is not suitable for real-time estimation; the lithium titanate and lithium iron phosphate batteries commonly used in the field of electric automobiles have poor linearity of OCV _ SOC curves, and are not suitable for an open-circuit voltage method in a voltage platform stage;
3) an Extended Kalman Filter (EKF) method is a model-based algorithm, and is a hotspot for research and application because it overcomes the problem that the ampere-hour integration method has strict requirements on the initial value of SOC and introduces the concept of error (independent of measured value). However, the accuracy of the EKF method is greatly influenced by the battery model and the model parameters, in the practical application process, the battery model parameters change along with the difference of SOC, current, temperature and battery aging degree, and the calculation amount of the algorithm is large, so that the EKF method is not suitable for practical engineering application.
4) The BP neural network method needs a large amount of input data, samples have great influence on training results, proper samples need to be screened, the sampling workload is large, the algorithm is complex, and the requirement on hardware is high. The method is difficult to be applied to the existing embedded BMS system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for calculating the residual capacity of a storage battery, which is characterized in that the SOC is calculated by adopting ampere-hour integration in the whole life cycle of the battery, and meanwhile, the SOC is corrected by utilizing the cut-off voltage when the battery is fully charged or discharged and utilizing an open-circuit voltage method in a non-platform area of the voltage of the battery, so that the accumulated error of the ampere-hour integration is eliminated, more accurate residual capacity is obtained, and more effective guarantee is provided for the efficient and safe use of the battery.
In order to achieve the technical effects, the invention adopts the following technical scheme:
a method for calculating the residual capacity of a storage battery comprises the following steps:
A. after the battery system is electrified and stabilized, reading out the data related to the residual capacity of the battery system during the last power failure from an internal or external storage;
B. acquiring state information of a current battery system;
C. determining the initial value SOC of the residual capacity of the storage battery according to the data obtained in the step A and the step Binit(ii) a And storing the obtained data;
so far, the initial value SOC of the residual capacity after power-oninitThe steps A to C are only executed once, and then the periodic detection and the calculation of the real-time remaining capacity SOC of the battery are carried outkThe process of (2):
D. sampling to obtain the state information of the current battery system, judging the charge-discharge state of the battery system, if the battery system is in the charge or discharge state, jumping to the step E, otherwise, entering the step F;
E. calculating the current battery residual capacity SOC by using an ampere-hour integration methodkThe accumulated discharge capacity of the battery and the current cycle period of the battery, and then the step H is carried out;
F. judging whether the current state of the battery system meets the cut-off voltage correction battery residual capacity SOC when the battery is fully charged and dischargedkIf yes, finishing correction and entering step H, otherwise, entering step G;
G. judging whether the current battery state meets the requirement of correcting the SOC by using an open-circuit voltage methodkIf yes, finishing correction and entering the step H, otherwise, directly entering the step H;
H. storing data and re-entering the step D to realize periodic detection and calculation of the residual capacity SOC of the batteryk。
In practice, the steps D to H are repeated periodically, specifically according to the polling period of the battery management system.
Further, the data related to the remaining capacity of the battery system at the last power outage in step a includes: the residual capacity of the battery at the last power failure, the time when the battery is left standing last time, the SOC value corrected last time, the battery cycle period at the last SOC correction, the accumulated discharge capacity of the battery and the current cycle period of the battery.
Further, the state information of the current battery system in the steps B and D includes: current calendar time, current charging and discharging current of the battery and battery voltage.
Further, the initial value SOC of the remaining capacity of the battery is determined in the step CinitThe method comprises the following steps:
C1. judging whether the battery residual capacity data read in the last power failure in the step A is successful, and if not, obtaining the SOC according to the battery voltage of the current battery obtained in the step B and the OCV-SOC curve of the batteryinitOtherwise, go to step C2;
C2. judging whether the voltage of the battery is in a non-platform area and whether the standing time of the battery is greater than a preset time threshold value;
C3. if the voltage of the battery is in the non-platform area and the standing time of the battery is greater than a preset time threshold value, calculating the SOC by using an open-circuit voltage methodinitOtherwise, set SOCinitEqual to the remaining capacity of the battery at the last power outage.
Further, the SOC is calculated in the step C3 by using an open circuit voltage methodinitSpecifically, an open-circuit voltage method is used, and the SOC is obtained according to the battery voltage of the current battery obtained in the step B and the OCV-SOC curve of the batteryinitAnd the SOC calculated using the open circuit voltage methodinitAssigning to the corrected SOC and calculating the current cycle period PkAnd assigning to the cycle period when the SOC is corrected.
Further, the step G corrects the SOC by using an open-circuit voltage methodkThe conditions of (a) include: the battery is in a standing state; the battery standing time is greater than the preset time threshold; the cell voltage is in the non-plateau region.
Further, since the estimation accuracy of the remaining capacity is generally about 5% at present, the meaning of frequent correction is not great. Therefore, in the scheme, the open-circuit voltage method is set for correcting the SOCkAny one of the following conditions is also required:
the first condition is as follows: the difference value of the SOC value corrected by the OCV-SOC curve and the SOC value corrected last time is larger than the preset value SOCdiffAnd SOCdiffGreater than 5%;
and a second condition: the current cycle period of the battery is different from the cycle period when the SOC is corrected last time.
Further, the step E specifically includes:
E1. setting the current to be positive during charging and negative during discharging, and accumulating the current values to obtain an accumulated current Iac；
E2. Calculating the accumulated discharge capacity Q of the battery by using an ampere-hour integration methodacc；
E3. Calculating the current cycle period P of the batteryc：
Wherein Q iseIs the rated capacity of the battery;
E4. judging whether the time of the battery in the non-standing state exceeds the time step T for updating the SOCCIf yes, go to step E5, otherwise, go to step H;
E5. according to the accumulated current value IacCalculating the time period TCInner average current value Iav，Then accumulating the current value IacClearing;
E6. using average current value I according to ampere-hour integrationavCalculating remaining capacity SOC of batterykThen, go to step H.
Further, the cut-off voltage during the full charge and the emptying of the battery in the step F is corrected to be SOCkThe conditions of (a) are as follows: the battery is in a full boundary state or an emptying boundary state, and the battery is in a standing state; the correction is specifically as follows: setting SOC when battery voltage is less than lower limit of cut-off voltagekEqual to 0; setting SOC when the battery voltage is greater than the upper limit of cut-off voltagekA value equal to 100, in practice, of the battery after a long period of useThe actual capacity will change, so the battery needs to be calibrated to modify the upper and lower limits of the cut-off voltage of the battery according to the aging condition of the battery.
Further, the data stored in the step H at least includes the current remaining battery capacity, the time when the latest battery is in the static state, the accumulated discharge capacity of the battery, and the current cycle period of the battery, and if the remaining battery capacity is corrected by using an open circuit voltage method or using a cut-off voltage when the battery is fully charged and emptied, the stored data further includes the SOC value corrected last time and the cycle period when the SOC is corrected.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the method for calculating the residual capacity of the storage battery corrects the residual capacity of the storage battery by adopting an open-circuit voltage method and a cut-off voltage when the storage battery is fully charged or emptied, so that the accumulated error caused by ampere-hour integration can be effectively reduced.
Second, in the battery remaining capacity calculation method of the present invention, the remaining capacity of the battery is corrected using the OCV only when the battery voltage is in the non-plateau period. Because the voltage of the battery is insensitive along with the change of the capacity in the plateau period, if the residual capacity of the battery is corrected according to the OCV at the moment, a larger error is easily caused; when the battery voltage is in the non-plateau period, the battery voltage obviously changes along with the capacity, and the effect of correcting the residual capacity of the battery by using an open-circuit voltage method can be better achieved.
Thirdly, in the method for calculating the residual capacity of the storage battery, the residual capacity of the storage battery is corrected by using the cut-off voltage of full charge or emptying of the storage battery only when the storage battery is in a static state, so that errors caused by the influence of charge and discharge multiplying power on the voltage of the storage battery are effectively avoided.
Fourthly, the method for calculating the residual capacity of the storage battery improves the calculation precision of the residual capacity of the storage battery, optimizes the calculation precision only on the basis of a software algorithm, and does not increase the hardware cost and the complexity of a battery management system.
Drawings
Fig. 1 is a schematic block flow diagram of a battery remaining capacity calculation method according to the present invention.
Fig. 2 is a schematic diagram of a vehicle battery management system in an embodiment of the present invention.
Fig. 3 is a detailed flowchart of a method for calculating the remaining battery capacity according to an embodiment of the present invention.
Detailed Description
The invention will be further elucidated and described with reference to the embodiments of the invention described hereinafter.
Example (b):
the first embodiment is as follows:
as shown in fig. 1, a method for calculating the remaining capacity of a storage battery includes the following steps:
step 1, after the system is electrified stably, reading the data related to the residual capacity of the battery system during the last power failure from an internal or external storage.
Wherein, the relevant data of the residual capacity of the battery system during the last power failure comprises: the remaining battery capacity at the time of power outage, the time when the battery was last left standing, the last corrected SOC value, the battery cycle period at the last SOC correction, the battery cumulative discharge capacity, and the like.
Step 2, acquiring the state information of the current battery system; the method comprises the following steps: current calendar time, current charging and discharging current of the battery and battery voltage.
Step 3, determining the initial value SOC of the residual capacity of the storage battery according to the data obtained in the step 1 and the step 2init(ii) a And save the relevant data to memory.
Specifically, the initial value SOC of the remaining capacity of the batteryinitThe determination method comprises the following steps: firstly, judging whether the battery residual capacity data read in the last power failure in the step 1 is successful, and if not, obtaining the SOC according to the battery voltage of the current battery obtained in the step 2 and the OCV-SOC curve of the batteryinitIf not, judging whether the voltage of the battery is in the non-platform area and whether the standing time of the battery is greater than a preset time threshold value; if the voltage of the battery is in the non-platform area and the standing time of the battery is greater than a preset time threshold value, calculating the SOC by using an open-circuit voltage methodinitOtherwise, set SOCinitIs equal to the last timeBattery residual capacity at power-off.
So far, the initial value SOC of the residual capacity after power-oninitThe steps 1 to 3 are only executed once, and then the periodic detection and the calculation of the real-time remaining capacity SOC of the battery are carried outkThe process of (1).
Step 4, sampling to obtain the state information of the current battery system; and judging the charge-discharge state of the battery system according to the current of the battery pack, if the battery is in the charge or discharge state, skipping to the step 5, otherwise, entering the step 6.
And 5, calculating the remaining capacity of the current battery, the accumulated discharge capacity of the battery and the current cycle period of the battery by using an ampere-hour integration method, and then executing the step 8.
Step 6, judging whether the current state of the battery system meets the requirements of the cut-off voltage correction battery residual capacity SOC when the battery is fully charged and emptiedkIf yes, the step 8 is skipped after the correction is completed. If not, go to step 7.
Specifically, the cut-off voltage correction SOC when the battery is fully charged and emptiedkThe conditions of (a) are as follows: the battery is in a full boundary state or an emptying boundary state, and the battery is in a standing state; the correction is specifically as follows: setting SOC when battery voltage is less than lower limit of cut-off voltagekEqual to 0; setting SOC when the battery voltage is greater than the upper limit of cut-off voltagekThe value is equal to 100.
Step 7, judging whether the current battery state meets the requirement of correcting the SOC by using an open-circuit voltage methodkIf yes, finishing correction and entering step 8, otherwise, directly entering step 8.
The condition corrected by using the open circuit voltage method comprises the following steps: the battery is in a standing state; the battery standing time is greater than the preset time threshold; the cell voltage is in the non-plateau region.
Because the estimation precision of the residual capacity is about 5 percent generally at present, the frequent correction significance is not large. Therefore, using the open circuit voltage method, one of the following two conditions needs to be satisfied:
1) battery corrected by using OCV-SOC curve at this timeThe difference value between the residual capacity and the residual capacity value of the battery at the last correction is larger than the preset value SOCdiff(wherein SOC)diffShould be greater than 5%);
2) the current cycle period of the battery is different from the cycle period when the remaining capacity of the battery is corrected last time.
And 8, storing the data.
The method specifically comprises the following steps of storing the following data contents: the current battery residual capacity, the time when the latest battery is in a static state, the accumulated discharge capacity of the battery, and the current cycle period of the battery. If the open circuit voltage method or the voltage cut-off voltage is used to correct the remaining capacity in steps 6 and 7, the battery remaining capacity value corrected last time and the cycle period for correcting the battery remaining capacity need to be updated and stored.
Example two
As shown in fig. 2, a structural component of a battery management system for a vehicle mainly includes the following parts: MCU central control unit, acquisition unit, display element and memory cell.
The acquisition unit is mainly responsible for detecting the current state of the battery system, including parameters such as charging and discharging current, battery voltage and temperature; the MCU central control unit is responsible for analyzing and processing the acquired data and calculating the current nuclear power state SOC, the current health state SOH, the current cycle period and the like of the battery. Controlling and protecting the current battery system according to the data processing result; meanwhile, various data are stored in the storage unit and submitted to the display end to be convenient for a user to observe. In addition, an accurate time unit is also contained in the central control unit, so that the state of the battery system at each moment can be accurately recorded. The vehicle battery management system specifically adopts the method for calculating the remaining capacity of the storage battery of the first embodiment as a working principle to realize the calculation of the remaining capacity of the storage battery.
EXAMPLE III
As shown in fig. 3, a method for calculating the remaining capacity of a storage battery includes the following steps:
step 1, after the system is electrified and stabilized, reading the battery system state in the last power failure from the internal or external storageState data including remaining battery capacity SOClastAnd last charging and discharging time t of storage batteryk-1Cumulative discharge capacity Q of batteryaccCurrent cycle period P of the batteryk。
Step 2, obtaining the state information of the current battery, including detecting the voltage V of the current batteryBatCurrent calendar time tk。
Step 3, if SOC in step 1lastIf the reading is successful, the step 4 is executed, otherwise, the step 5 is executed.
Step 4, judging the use conditions of the open circuit voltage method:
if the current state of the battery system uses the condition of the open-circuit voltage method, namely the battery voltage is in the non-plateau region and the standing time t of the batteryst(tst＝tk-tk-1) A threshold value T larger than the preset standing timesdStep 5 is executed, otherwise step 6 is executed.
Step 5, using open circuit voltage method to detect V in step 2BatSOC was derived from the OCV-SOC curve (supplied directly by the battery manufacturer)init(the open-circuit voltage method is combined with the battery voltage and the OCV-SOC curve to obtain the SOCinitThe method (a) is an existing mature method, and is not described herein again); and will SOCinitAssigning to the corrected battery remaining capacity value SOCadjCurrent cycle period PkAssigning to the cycle period P when the remaining battery capacity is correctedadjAnd then relevant data is saved.
Step 6, setting SOCinit＝SOClastAnd save the relevant data.
To this end, the determination of the initial remaining battery capacity value after power-up is completed, and steps 1 to 6 are performed only once, and the period T will be described belowIThe battery current is sampled and the remaining capacity of the battery is periodically calculated:
step 7, sampling to obtain the state information of the current battery system, including the real-time current value IcCurrent battery voltage VBatCurrent time tk。
Step 8, according to the real-time current value IcThe charging and discharging state of the current battery can be determined, and if the battery is in the charging or discharging state, the step 9 is skipped; otherwise, the time t of the storage battery in the standing state last time is updatedk-1Then, step 12 is entered.
And 9, setting the current to be positive during charging and negative during discharging, and accumulating the current values to obtain accumulated current Iac(ii) a Calculating the accumulated discharge capacity Q of the battery by using an ampere-hour integration methodacc(the method for calculating the accumulated discharge capacity of the battery by using the ampere-hour integration method is a method commonly used in the prior art and is not described in detail herein), and then the current cycle period P of the battery is calculatedc：Wherein Q iseIs the rated capacity of the battery.
Step 10, judging whether the time of the battery in the non-standing state exceeds the preset updating SOCkTime step T ofCIf yes, go to step 11, otherwise go to step 14.
It is noted here that the time step T for updating the SOCCThe value should be greater than the sampling period T of the currentI(ii) a But at the same time TCThe value should not be too large, and the average current can not accurately reflect the charge-discharge characteristics of the battery under the condition of preventing complex working conditions.
Step 11, according to the accumulated current value IacCalculating the time period TCInner average current value Iav，
Then accumulating the current value IacClearing, and utilizing average current value I according to ampere-hour integration methodavCalculating remaining capacity SOC of batteryk(the method for calculating the residual capacity of the battery by using an ampere-hour integration method is a method commonly used in the prior art, and an average current value I is required in the calculationavThis parameter, a way of calculating the average current value is provided in the present application), and then step 14 is entered.
And step 12, correcting the SOC by using the cut-off voltage of the battery.
Judging whether the current state of the battery system meets the cut-off voltage correction battery residual capacity SOC when the battery is fully charged and dischargedkIf the condition for correction is satisfied, correcting the real-time remaining capacity SOC of the batterykAnd then the SOC is measuredkIs stored to the corrected battery remaining capacity value SOCadjAfter the correction is completed, the process proceeds to step 14. If the correction condition is not satisfied, the flow proceeds to step 13
Wherein, the cut-off voltage of the battery at full charge and emptying corrects the SOCkThe conditions of (a) are as follows:
the battery is in a full or empty boundary state; the battery is in a resting state.
The correction is carried out when the battery is in a standing state, the charging and discharging multiplying power has great influence on the voltage of the battery when the battery is in a full-charge or empty boundary state, and if the battery is in a non-standing state, the SOC is corrected according to the voltage threshold valuekA large error may result.
The correction is specifically as follows: when the battery voltage VBatLess than the set lower limit voltage VSOC0Then, set SOCkEqual to 0; when the battery voltage VBatAbove full upper limit voltage VSOC100Then, set SOCkThe value is equal to 100. After long-term use, the battery capacity will change, and the battery can be calibrated and the threshold voltage V of the battery can be modified according to the aging condition of the batterySOC100And VSOC0。
And step 13, correcting the SOC by using an open circuit voltage method.
Judging whether the current battery state meets the requirement of correcting the SOC by using an open-circuit voltage methodkThe conditions of (1). If the correction condition is met, correcting the real-time residual capacity SOC of the batterykAnd then the SOC is measuredkIs stored to a corrected SOC value SOCadj。
Specifically, in this embodiment, the open-circuit voltage method is used to correct the battery capacity, and the following conditions must be satisfied:
1) the battery is in a standing state at present;
2) battery standing time tst(tst＝tk-tk-1) Exceeding a defined standing time threshold Tsd(at least 1 hour or more);
3) the battery voltage is in the non-plateau region.
Because the estimation precision of the residual capacity is about 5 percent generally at present, the frequent correction significance is not large. Therefore, on the basis of simultaneously satisfying the above three conditions, one of the following two conditions needs to be satisfied to correct the battery capacity by using the open-circuit voltage method:
1. current battery remaining capacity SOC calculated by using OCV _ SOC curvekAnd the last corrected remaining battery capacity SOCadjThe difference between the two is greater than the preset value SOCdiff(wherein SOC)diffShould be greater than 5%).
2. Current cycle period P of the batterykAnd the cycle period P of the last time of correcting the remaining capacity of the batteryadjAre not identical.
And step 14, storing the data.
The data to be stored includes: current remaining capacity SOCkCumulative discharge capacity Q of batteryaccCurrent cycle period P of the batteryk(ii) a If the remaining battery capacity is corrected by the cut-off voltage or the open-circuit voltage when the battery is in the stationary state, it is necessary to store the time t when the battery was in the stationary state last timek-1And a cycle period P for correcting the remaining battery capacityadjCorrected remaining battery capacity SOCadjAnd the like.
Specifically, steps 8 to 14 belong to periodic detection of the remaining battery capacity, and therefore need to be performed cyclically at a predetermined period during the operation of the system.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for calculating the residual capacity of a storage battery is characterized by comprising the following steps:
A. after the battery system is electrified and stabilized, reading out the data related to the residual capacity of the battery system during the last power failure from an internal or external storage;
B. acquiring state information of a current battery system;
C. determining the initial value SOC of the residual capacity of the storage battery according to the data obtained in the step A and the step Binit；
And storing the obtained data;
D. sampling to obtain the state information of the current battery system, judging the charge-discharge state of the battery system, if the battery system is in the charge or discharge state, jumping to the step E, otherwise, entering the step F;
E. calculating the current battery residual capacity SOC by using an ampere-hour integration methodkThe accumulated discharge capacity of the battery and the current cycle period of the battery, and then the step H is carried out;
F. judging whether the current state of the battery system meets the cut-off voltage correction battery residual capacity SOC when the battery is fully charged and dischargedkIf yes, finishing correction and entering step H, otherwise, entering step G;
G. judging whether the current battery state meets the requirement of correcting the SOC by using an open-circuit voltage methodkIf yes, finishing correction and entering the step H, otherwise, directly entering the step H;
H. storing data and re-entering the step D to realize periodic detection and calculation of the residual capacity SOC of the batteryk。
2. The method according to claim 1, wherein the data related to the remaining capacity of the battery system at the last power outage in step a comprises: the residual capacity of the battery at the last power failure, the time when the battery is left standing last time, the residual capacity of the battery corrected last time, the battery cycle period at the last time when the residual capacity of the battery is corrected, the accumulated discharge capacity of the battery, and the current cycle period of the battery.
3. The method according to claim 2, wherein the state information of the current battery system in the steps B and D includes: current calendar time, current charging and discharging current of the battery and battery voltage.
4. The method according to claim 3, wherein the initial value SOC of the remaining capacity of the battery is determined in step CinitThe method comprises the following steps:
C1. judging whether the battery residual capacity data read in the last power failure in the step A is successful, and if not, obtaining the SOC according to the battery voltage of the current battery obtained in the step B and the OCV-SOC curve of the batteryinitOtherwise, go to step C2;
C2. judging whether the voltage of the battery is in a non-platform area and whether the standing time of the battery is greater than a preset time threshold value;
C3. if the voltage of the battery is in the non-platform area and the standing time of the battery is greater than a preset time threshold value, calculating the SOC by using an open-circuit voltage methodinitOtherwise, set SOCinitEqual to the remaining capacity of the battery at the last power outage.
5. The method as claimed in claim 4, wherein the SOC is calculated by using an open circuit voltage method in the step C3initSpecifically, an open-circuit voltage method is used, and the SOC is obtained according to the battery voltage of the current battery obtained in the step B and the OCV-SOC curve of the batteryinitAnd the SOC calculated using the open circuit voltage methodinitAnd assigning the current cycle period Pk to the corrected residual capacity of the battery, and assigning the current cycle period Pk to the cycle period when the residual capacity of the battery is corrected.
6. The method according to claim 1, wherein the step G corrects SOC by using an open circuit voltage methodkThe conditions of (a) include: the battery is in restA state; the battery standing time is greater than a preset time threshold; the cell voltage is in the non-plateau region.
7. The method according to claim 6, wherein the SOC is corrected by using an open circuit voltage methodkAny one of the following conditions is also required:
the first condition is as follows: the difference value between the residual capacity of the battery corrected by the OCV-SOC curve and the residual capacity of the battery corrected last time is larger than the preset value SOCdiffAnd SOCdiffGreater than 5%;
and a second condition: the current cycle period of the battery is different from the cycle period when the remaining capacity of the battery is corrected last time.
8. The method for calculating the remaining capacity of the storage battery according to claim 1, wherein the step E is specifically:
E1. setting the current to be positive during charging and negative during discharging, and accumulating the current values to obtain an accumulated current Iac；
E2. Calculating the accumulated discharge capacity Q of the battery by using an ampere-hour integration methodacc；
E3. Calculating the current cycle period P of the batteryc：Wherein Q iseIs the rated capacity of the battery;
E4. judging whether the time of the battery in the non-standing state exceeds the preset updating SOCkTime step T ofCIf yes, go to step E5, otherwise, go to step H;
E5. according to the accumulated current value IacCalculating the time period TCInner average current value Iav，
Then accumulating the current value IacClearing;
E6. using plane according to ampere-hour integrationMean current value IavCalculating remaining capacity SOC of batterykThen, go to step H.
9. The method according to claim 1, wherein the cut-off voltage correction SOC at the time of full and empty battery in step F is set to be higher than the SOC at the time of full and empty batterykThe conditions of (a) are as follows: the battery is in a full boundary state or an emptying boundary state, and the battery is in a standing state; the correction is specifically as follows: setting SOC when battery voltage is less than lower limit of cut-off voltagekEqual to 0; setting SOC when the battery voltage is greater than the upper limit of cut-off voltagekThe value is equal to 100.
10. The method according to claim 1, wherein the data stored in step H includes at least the current remaining battery capacity, the time when the latest battery is in a static state, the accumulated discharge capacity of the battery, and the current cycle period of the battery, and if the remaining capacity is corrected by an open circuit voltage method or by a cut-off voltage when the battery is fully charged and emptied, the stored data further includes the last corrected remaining battery capacity value and the cycle period when the remaining battery capacity is corrected.
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