WO2020259039A1 - 荷电状态修正方法及装置 - Google Patents

荷电状态修正方法及装置 Download PDF

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WO2020259039A1
WO2020259039A1 PCT/CN2020/086198 CN2020086198W WO2020259039A1 WO 2020259039 A1 WO2020259039 A1 WO 2020259039A1 CN 2020086198 W CN2020086198 W CN 2020086198W WO 2020259039 A1 WO2020259039 A1 WO 2020259039A1
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Prior art keywords
charge
state
capacity
open circuit
circuit voltage
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PCT/CN2020/086198
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English (en)
French (fr)
Inventor
杜明树
李世超
汤慎之
谭俐
卢艳华
张伟
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宁德时代新能源科技股份有限公司
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Priority to JP2020572771A priority Critical patent/JP7017652B2/ja
Priority to EP20820308.3A priority patent/EP3796015B1/en
Priority to KR1020207034286A priority patent/KR20220023281A/ko
Priority to US17/134,253 priority patent/US10989759B1/en
Publication of WO2020259039A1 publication Critical patent/WO2020259039A1/zh
Priority to US17/210,010 priority patent/US11536772B2/en

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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]
    • G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/30—Measuring the maximum or the minimum value of current or voltage reached in a time interval
    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • 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
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]

Definitions

  • This application belongs to the field of battery technology, and in particular relates to a method and device for modifying the state of charge.
  • SOC State of Charge
  • the open circuit voltage method can use the corresponding relationship between the open circuit voltage (OCV) and the SOC to obtain a stable battery SOC.
  • OCV open circuit voltage
  • the battery is required to have no hysteresis characteristics.
  • the hysteresis characteristic refers to a situation where the charging OCV curve and the discharging OCV curve do not coincide under the same SOC and temperature, that is, the OCV curve is affected by historical operating conditions. If the open circuit voltage method is used to calculate the SOC of a battery with hysteresis characteristics, the SOC of the battery calculated by the open circuit voltage method will have a large error, which reduces the accuracy of the calculated SOC.
  • the embodiments of the present application provide a state-of-charge correction method and device, which can improve the accuracy of the state-of-charge calculation.
  • an embodiment of the present application provides a state-of-charge correction method, including: determining the working state of a single cell, the working state includes a discharging state or a charging state; according to the obtained current open circuit voltage, The obtained current cumulative capacity of the single cell, the corresponding relationship of the cumulative capacity corresponding to the working state of the single cell, and the open circuit voltage curve corresponding to the limit initial state of charge, determine the corrected state of charge of the single cell,
  • the cumulative capacity correspondence relationship includes the corresponding relationship between the pre-measured open circuit voltage and the cumulative capacity threshold.
  • an embodiment of the present application provides a state-of-charge correction device, including: a state determination module for determining the working state of a single cell, the working state including a discharging state or a charging state; The current open circuit voltage of the obtained single cell, the current cumulative capacity of the obtained single cell, the corresponding relationship of the cumulative capacity corresponding to the working state of the single cell, and the open circuit voltage curve corresponding to the limit initial state of charge, Determine the corrected state of charge of the single cell, and the cumulative capacity correspondence relationship includes the correspondence relationship between the pre-measured open circuit voltage and the cumulative capacity threshold.
  • the working state of the single cell is determined, and the current open circuit voltage of the obtained single cell, the current cumulative capacity of the obtained single cell, and the working state corresponding to the single cell are determined.
  • the corresponding relationship between the accumulated capacity and the open circuit voltage curve corresponding to the limit initial state of charge are used to determine the corrected state of charge of the single cell.
  • the cumulative capacity correspondence relationship includes the correspondence relationship between the open circuit voltage measured in advance and the cumulative capacity threshold. The cumulative capacity correspondence relationship can characterize the historical operating conditions of a single cell.
  • the parameters that can guarantee the historical working condition of the single cell are introduced into the calculation process of the state of charge, that is, in the process of calculating the state of charge, the historical working condition of the single cell is considered, and the charge of the single cell is State of charge correction, which uses the corrected state of charge as the state of charge of a single cell, reduces the influence of historical operating conditions on the calculation of the state of charge, thereby improving the accuracy of the calculation of the state of charge.
  • FIG. 1 is a flowchart of a state-of-charge correction method in an embodiment of this application
  • FIG. 2 is a flowchart of a state-of-charge correction method in another embodiment of this application.
  • FIG. 3 is a flowchart of a state-of-charge correction method in another embodiment of this application.
  • FIG. 4 is a schematic structural diagram of a state-of-charge correction device in an embodiment of the application.
  • FIG. 5 is a schematic structural diagram of a state-of-charge correction device in another embodiment of the application.
  • FIG. 6 is a schematic structural diagram of a state-of-charge correction device in another embodiment of this application.
  • FIG. 7 is a schematic structural diagram of a state-of-charge correction device in an embodiment of this application.
  • the embodiments of the present application may provide a method and device for correcting the state of charge, which can be applied to a scenario where the state of charge of a battery is calculated, and executed by a battery management system (Battery Management System, BMS).
  • BMS Battery Management System
  • the state of charge of the single cell can be corrected, and the state of charge of the battery module and the battery pack can also be determined according to the state of charge of the single cell, which will not be repeated here.
  • the state of charge correction method and device in the embodiments of the present application the state of charge of a single cell with hysteresis characteristics can be corrected to improve the calculated charge of a single cell with hysteresis characteristics The accuracy of the state.
  • FIG. 1 is a flowchart of a state-of-charge correction method in an embodiment of the application. As shown in FIG. 1, the state-of-charge correction method includes step S101 and step S102.
  • step S101 the operating state of the single cell is determined.
  • the working state includes the discharging state or the charging state.
  • the working state of the single cell is the discharge state, the single cell is being discharged, or in the recent period of time, the single cell is mainly discharged.
  • the working state of the single cell is the charging state, the single cell is being charged, or in the recent period of time, the single cell is mainly charged.
  • the working state of the single cell is the charging state.
  • step S102 according to the obtained current open circuit voltage of the single cell, the obtained current cumulative capacity of the single cell, the corresponding relationship of the cumulative capacity corresponding to the working state of the single cell, and the limit initial state of charge
  • the corresponding open-circuit voltage curve determines the modified state of charge of the single cell.
  • the current open circuit voltage of the cell is the open circuit voltage (Open Circuit Voltage, OCV) of the cell at the current moment.
  • the current cumulative capacity of a single cell is the cumulative capacity of the single cell within the time period ending at the current moment. The time period up to the current moment does not include the resting time. The resting time is the time during which the single cell is not in the working state, or the time during which the current in the circuit where the single cell is located is less than the preset current threshold. It should be noted that the standing time can be calculated cumulatively.
  • the accumulated capacity includes accumulated charge capacity and accumulated discharge capacity.
  • the cumulative capacity correspondence relationship includes the corresponding relationship between the pre-measured open circuit voltage and the cumulative capacity threshold.
  • the cumulative capacity corresponding relationship indicates the corresponding relationship between different open-circuit voltages and cumulative capacity thresholds in historical operating conditions.
  • the accumulative capacity threshold is the maximum or minimum of the accumulative capacity allowed or required, which is obtained by statistics in a preset time period, which does not include the resting time.
  • the limit initial state of charge may include 100% and/or 0%. If the limit initial state of charge includes 100%, the open circuit voltage curve corresponding to the limit initial state of charge is the discharge open circuit voltage curve with the initial state of charge of 100%, that is, the full charge and discharge open circuit voltage curve (that is, the full charge and discharge OCV curve).
  • the open circuit voltage curve represents the correspondence between the open circuit voltage and the state of charge (SOC). It should be noted that in the embodiments of the present application, the use of the open circuit voltage curve is not limited, and other forms that can indicate the correspondence between the open circuit voltage and the state of charge, such as tables, are also applicable to this application.
  • the obtained current open circuit voltage of the single cell and the open circuit voltage curve corresponding to the operating state of the single cell can be used to query the accumulated capacity threshold corresponding to the current open circuit voltage.
  • the current cumulative capacity of the single cell, the cumulative capacity threshold corresponding to the current open circuit voltage, and the open circuit voltage curve corresponding to the limit initial state of charge are then used to determine the corrected state of charge of the single cell. The accuracy of the corrected state of charge is higher.
  • the modified state of charge of the single cell is used to replace the calculated state of charge of the single cell.
  • the calculated state of charge of the single cell is the state of charge calculated by the real-time state of charge calculation method , For example, the state of charge calculated by the open circuit voltage method, neural network method, Kalman filter method and other methods. Since the state of charge calculated by the real-time state of charge calculation method may have a large error, the state of charge correction method in the embodiment of the present application can be used for correction to obtain the accuracy of the corrected state of charge of the single cell higher.
  • the working state of the single cell is determined, and the current open circuit voltage of the obtained single cell, the current cumulative capacity of the obtained single cell, and the working state corresponding to the single cell are determined.
  • the corresponding relationship between the accumulated capacity and the open circuit voltage curve corresponding to the limit initial state of charge are used to determine the corrected state of charge of the single cell.
  • the cumulative capacity correspondence relationship includes the correspondence relationship between the open circuit voltage measured in advance and the cumulative capacity threshold. The cumulative capacity correspondence relationship can characterize the historical operating conditions of a single cell.
  • the parameters that can guarantee the historical working condition of the single cell are introduced into the calculation process of the state of charge, that is, in the process of calculating the state of charge, the historical working condition of the single cell is considered, and the charge of the single cell is State of charge correction, which uses the corrected state of charge as the state of charge of a single cell, reduces the influence of historical operating conditions on the calculation of the state of charge, thereby improving the accuracy of the calculation of the state of charge. Moreover, since the calculated state of charge can be corrected, the applicability of the calculation of the state of charge is also improved.
  • FIG. 2 is a flowchart of a state-of-charge correction method in another embodiment of the application.
  • the working state of the single cell includes the discharge state.
  • the cumulative capacity threshold includes the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity.
  • the state of charge correction method shown in FIG. 2 may further include step S103a, step S104a, and step S105a. Step S102 in the foregoing embodiment can be specifically refined into step S1021a to step S1026a.
  • step S103a the discharge open circuit voltage curves of different initial states of charge under different discharge conditions are obtained.
  • the discharge conditions include discharge rate, test conditions, and so on.
  • the test condition is the recharge condition after discharge.
  • Different initial states of charge can be set under the same discharge condition. For example, charge the cell to different states of charge after fully discharged, and use the different states of charge obtained by charging the cell after fully discharged as The initial state of charge. Taking the initial state of charge as the starting point, the single cells are discharged under the same discharge conditions.
  • the cell is charged to a state of charge of 60%, and 60% of the state of charge is taken as the initial state of charge of the cell, and the cell is charged Discharge, and obtain the discharge open circuit voltage curve of a single cell with an initial state of charge of 60%.
  • a single cell with an initial state of charge of 60% can be discharged 6% each time, and then recharged by 1%, until the state of charge of the single cell is 0%.
  • the cell is charged to a state of charge of 80%, and 80% of the state of charge is taken as the initial state of charge of the cell.
  • the discharge is performed to obtain the discharge open circuit voltage curve of a single cell with an initial state of charge of 80%.
  • a single cell with an initial state of charge of 80% can be discharged 7% each time, and then recharged by 2%, until the state of charge of the single cell is 0%.
  • An initial state of charge under the same discharge condition corresponds to a discharge open circuit voltage curve.
  • Different initial states of charge under different discharge conditions correspond to multiple discharge open circuit voltage curves.
  • the same discharge condition means that the factors in the discharge condition are the same.
  • the discharge conditions include discharge rate and test conditions. If the discharge condition A1 and the discharge condition A2 are the same discharge conditions, the discharge conditions A1 and A2 have the same discharge rate and the test conditions are also the same.
  • step S104a if condition one is satisfied, the accumulated charge capacity and accumulated discharge capacity corresponding to the discharge open circuit voltage curve are obtained.
  • Condition one includes: the first open circuit voltage corresponds to the state of charge in the discharge open circuit voltage curve, and the error between the first open circuit voltage corresponding to the state of charge in the discharge open circuit voltage curve where the initial state of charge is 100% Within the preset error accuracy range.
  • the limit initial state of charge in the embodiment of the present application includes 100%.
  • the initial state of charge is 100% of the discharge open circuit voltage curve (ie full charge and discharge open circuit voltage curve) corresponding to the first open circuit voltage.
  • the error of the state of charge is detected.
  • the preset error accuracy range is the acceptable error accuracy range during the calculation of the state of charge. If the error is within the preset error accuracy range, it means that the state of charge in the discharge open circuit voltage curve has no influence on the calculation of the state of charge beyond acceptance, and the accuracy of the data obtained according to the discharge open circuit curve is high. Therefore, the discharge open-circuit curve can be used to obtain the cumulative capacity threshold to establish the cumulative capacity corresponding relationship.
  • step S105a the accumulated discharge capacity with the smallest value is set as the minimum required accumulated discharge capacity, and the accumulated charge capacity with the largest value is set as the maximum allowable accumulated charge capacity.
  • step S104a multiple discharge open circuit voltage curves that meet the preset error accuracy range may be obtained, and each discharge open circuit curve corresponds to an accumulated discharge capacity and an accumulated charge capacity.
  • the minimum of the cumulative discharge capacity corresponding to the multiple discharge open-circuit curves is regarded as the minimum required cumulative discharge capacity.
  • the maximum value of the accumulated discharge capacity corresponding to the multiple open discharge curves is regarded as the maximum allowable accumulated charge capacity.
  • the minimum required cumulative discharge capacity is the discharge capacity that a single cell needs to discharge at least in order to avoid the discharge open-circuit curve being affected by historical conditions. If the cumulative discharge capacity is less than the minimum required cumulative discharge capacity, it cannot be guaranteed that the open-circuit discharge curve at this time coincides with or is close enough to the open-circuit voltage curve at full charge and discharge.
  • the maximum allowable accumulative charging capacity is the charging capacity that a single cell can be charged at most in order to avoid the discharge open-circuit curve being affected by historical conditions.
  • step S1021a the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity corresponding to the current open circuit voltage are obtained according to the cumulative capacity corresponding relationship corresponding to the discharge state of the single cell.
  • the cumulative capacity corresponding relationship in the foregoing embodiment includes the corresponding relationship between the pre-measured open circuit voltage and the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity.
  • the cumulative capacity correspondence relationship can be embodied in the form of a table.
  • Table 1 is the corresponding relationship table of accumulated capacity in the embodiments of this application:
  • Table 1 records the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity for the five open circuit voltages OCV1, OCV2, OCV3, OCV4, and OCV5 in the discharge state.
  • the corresponding minimum required cumulative discharge capacity and maximum allowable cumulative charge capacity can be queried according to the open circuit voltage. For example, if the current open circuit voltage of a single cell is OCV3, the open circuit voltage OCV3 corresponds to the minimum required cumulative discharge capacity B3 and the maximum allowable cumulative charge capacity C3.
  • step S1022a if condition two is met, the state of charge corresponding to the current open circuit voltage in the discharge open circuit voltage curve with the initial state of charge of 100% is taken as the modified state of charge of the single cell.
  • Condition two includes: the acquired current accumulated charge capacity is less than the maximum allowable accumulated charge capacity corresponding to the current open circuit voltage, and the acquired current accumulated discharge capacity is greater than the minimum required accumulated discharge capacity corresponding to the current open circuit voltage.
  • the limit initial state of charge includes 100%.
  • the current accumulated capacity of the single cell in the above embodiment includes the current accumulated charge capacity ⁇ ChrgCap and the current accumulated discharge capacity ⁇ DischrgCap.
  • the acquired current cumulative charge capacity ⁇ ChrgCap is less than the maximum allowable cumulative charge capacity ⁇ MaxCap_Chrg corresponding to the current open circuit voltage in the cumulative capacity correspondence, and the acquired current cumulative discharge capacity ⁇ DischrgCap is greater than the minimum required cumulative discharge capacity corresponding to the current open circuit voltage in the cumulative capacity correspondence.
  • ⁇ MinCap_Dischrg the discharge open circuit voltage curve with the initial state of charge of 100% (ie, the full charge and discharge open circuit voltage curve) can be used directly to correct the state of charge of the single cell. Specifically, the state of charge corresponding to the current open circuit voltage in the discharge open circuit voltage curve with the initial state of charge of 100% is taken as the modified state of charge of the single cell.
  • step S1023a if condition three is met, compare the calculated state of charge of the single cell, the initial state of charge of 100% discharge open circuit voltage curve corresponding to the maximum open circuit voltage state of charge and initial charge
  • the state of charge is the state of charge corresponding to the minimum open circuit voltage in the 0% charge open circuit voltage curve.
  • Condition three includes: the acquired current cumulative charge capacity is greater than or equal to the maximum allowable cumulative charge capacity corresponding to the current open circuit voltage, or the acquired current cumulative discharge capacity is less than or equal to the minimum required cumulative discharge capacity corresponding to the current open circuit voltage.
  • the acquired current cumulative charging capacity ⁇ ChrgCap is greater than or equal to the maximum allowable cumulative charging capacity ⁇ MaxCap_Chrg corresponding to the current open circuit voltage in the cumulative capacity correspondence, or the acquired current cumulative discharge capacity ⁇ DischrgCap is less than or equal to the minimum requirement corresponding to the current open circuit voltage in the cumulative capacity correspondence relationship
  • the cumulative discharge capacity ⁇ MinCap_Dischrg can be based on the calculated state of charge of the single cell, the charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve (ie, the full charge and discharge open circuit voltage curve) with the initial state of charge of 100% State (i.e. state of charge correction maximum value) and the charge open circuit voltage curve (i.e. full-discharge open circuit voltage curve) where the initial state of charge is 0% ) Correct the calculated state of charge of the single cell through the subsequent steps S1024a to S1026a.
  • step S1024a if condition 4 is satisfied, the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve with the initial state of charge of 100% is taken as the modified state of charge of the single cell.
  • Condition four includes: the calculated state of charge of the single cell is greater than the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100%.
  • step S1025a if condition 5 is met, the state of charge corresponding to the minimum open circuit voltage in the charging open circuit voltage curve with the initial state of charge of 0% is taken as the modified state of charge of the single cell.
  • Condition 5 includes: the calculated state of charge of the single cell is less than the state of charge corresponding to the minimum open circuit voltage in the charging open circuit voltage curve where the initial state of charge is 0%.
  • step S1026a if condition six is satisfied, the calculated state of charge of the single cell is taken as the corrected state of charge of the single cell.
  • Condition 6 includes: the calculated state of charge of the single cell is less than or equal to the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100%, and is greater than or equal to the initial state of charge The state of charge corresponding to the minimum open circuit voltage in the 0% charging open circuit voltage curve.
  • the limit initial state of charge includes 100% and 0%.
  • the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve with a state of charge of 100% and the state of charge corresponding to the minimum open circuit voltage in the charging open circuit voltage curve with an initial state of charge of 0% define the modified state of charge Range.
  • the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the state of charge is 100% is used as the upper limit of the range of the modified state of charge
  • the minimum open circuit voltage in the charge open circuit voltage curve where the initial state of charge is 0% The corresponding state of charge serves as the lower limit of the range of the modified state of charge.
  • the state of charge is the modified state of charge of the single cell. If the calculated state of charge of the single cell is greater than the upper limit of the range of the corrected state of charge, the state of charge of the single cell is corrected to the upper limit of the range of the corrected state of charge, that is, the above correction The upper limit of the range of the state of charge of the single cell is used as the modified state of charge of the single cell.
  • the state of charge of the single cell is corrected to the lower limit of the above-mentioned corrected state of charge, that is, the above-mentioned correction
  • the lower limit of the range of the state of charge of the single cell is used as the modified state of charge of the single cell.
  • FIG. 3 is a flowchart of a state-of-charge correction method in another embodiment of the application.
  • the working state of the single cell includes the charging state.
  • the capacity increment threshold includes the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity.
  • the state of charge correction method shown in FIG. 3 may further include step S103b, step S104b, and step S105b. Step S102 in the foregoing embodiment can be specifically refined into step S1021b to step S1026b.
  • step S103b the charging open circuit voltage curves of different initial states of charge under different charging conditions are obtained.
  • the charging conditions include charging rate, test conditions, and so on.
  • the test condition is the discharge condition after charging.
  • Different initial state of charge can be set under the same charging condition, for example, the single cell is fully charged and discharged to a different state of charge, and the single cell is fully charged and discharged to obtain different states of charge As the initial state of charge. Starting from the initial state of charge, the single cells are charged under the same charging conditions.
  • a single cell with an initial state of charge of 40% can be charged 6% each time, and then discharged by 1%, until the state of charge of the single cell is 100%.
  • a single cell with an initial state of charge of 60% can be charged 7% each time, and then discharged by 2% until the state of charge of the single cell is 100%.
  • An initial state of charge under the same charging condition corresponds to a charging open circuit voltage curve.
  • Different initial states of charge under different discharge conditions correspond to multiple charge open circuit voltage curves.
  • the same charging condition means that the factors in the charging condition are the same.
  • the charging conditions include charging rate and test conditions. If the charging condition D1 and the charging condition D2 are the same charging conditions, the charging conditions D1 and D2 have the same charging rate and the test conditions are also the same.
  • step S104b if condition 7 is met, the accumulated charge capacity and accumulated discharge capacity corresponding to the charge open circuit voltage curve are obtained.
  • Condition 7 includes: the state of charge corresponding to the second open circuit voltage in the charging open circuit voltage curve, and the error between the second open circuit voltage corresponding to the state of charge in the charging open circuit voltage curve where the initial state of charge is 0% Within the preset error accuracy range.
  • the limit initial state of charge in the embodiment of the present application includes 0%.
  • the preset error accuracy range is the acceptable error accuracy range during the calculation of the state of charge.
  • the open-circuit charging curve can be used to obtain the cumulative capacity threshold to establish a corresponding relationship between the cumulative capacity.
  • step S105b the accumulated discharge capacity with the largest value is set as the maximum allowable accumulated discharge capacity, and the accumulated charge capacity with the smallest value is set as the minimum required accumulated charge capacity.
  • step S104b multiple charge open circuit voltage curves satisfying the preset error accuracy range may be obtained, and each charge open circuit curve corresponds to an accumulated discharge capacity and an accumulated charge capacity.
  • the maximum value of the accumulated discharge capacity corresponding to the multiple charge open-circuit curves is regarded as the maximum allowable accumulated discharge capacity. Take the minimum of the accumulated charging capacity corresponding to multiple open-circuit charging curves as the minimum required accumulated charging capacity.
  • the maximum allowable cumulative discharge capacity is the discharge capacity that a single cell can discharge at most in order to avoid the charge open-circuit curve from being affected by historical conditions.
  • the minimum required cumulative charging capacity is the charging capacity that a single cell needs to be charged at least in order to avoid the open-circuit curve of charging being affected by historical conditions. If the accumulative charging capacity is less than the minimum required accumulative charging capacity, it cannot be guaranteed that the open-circuit charging curve at this time coincides with or is close enough to the open-circuit voltage curve of full-discharge charging.
  • step S1021b the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity corresponding to the current open circuit voltage are obtained based on the cumulative capacity corresponding relationship corresponding to the state of charge of the single cell.
  • the corresponding relationship of the cumulative capacity in the foregoing embodiment includes the corresponding relationship between the open circuit voltage measured in advance and the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity.
  • the cumulative capacity correspondence relationship can be embodied in the form of a table.
  • Table 2 is the corresponding relationship table of accumulated capacity in the embodiment of the application:
  • Table 2 records the minimum required cumulative charge capacity and maximum allowable cumulative discharge capacity for the five open circuit voltages OCV1, OCV2, OCV3, OCV4, and OCV5 in the charging state, respectively.
  • the corresponding minimum required cumulative charge capacity and maximum allowable cumulative discharge capacity can be queried according to the open circuit voltage. For example, if the current open circuit voltage of a single cell is OCV2, the open circuit voltage OCV2 corresponds to the minimum required cumulative charge capacity E2 and the maximum allowable cumulative discharge capacity F2.
  • step S1022b if condition eight is satisfied, the state of charge corresponding to the current open circuit voltage in the charging open circuit voltage curve with the initial state of charge of 0% is taken as the modified state of charge of the single cell.
  • Condition eight includes: the acquired current cumulative discharge capacity is less than the maximum allowable cumulative discharge capacity corresponding to the current open circuit voltage, and the acquired current cumulative charge capacity is greater than the minimum required cumulative charge capacity corresponding to the current open circuit voltage.
  • the limit initial state of charge includes 0%.
  • the current accumulated capacity of the single cell in the above embodiment includes the current accumulated charge capacity ⁇ ChrgCap and the current accumulated discharge capacity ⁇ DischrgCap.
  • the obtained current cumulative discharge capacity ⁇ DischrgCap is less than the maximum allowable cumulative discharge capacity ⁇ MaxCap_Dischrg corresponding to the current open circuit voltage in the cumulative capacity correspondence relationship, and the obtained current cumulative charge capacity ⁇ ChrgCap is greater than the minimum required cumulative charge capacity corresponding to the current open circuit voltage in the cumulative capacity correspondence relationship ⁇ MinCap_Chrg
  • the charge open circuit voltage curve with the initial state of charge of 0% can be directly used to modify the state of charge of the single cell. Specifically, the state of charge corresponding to the current open circuit voltage in the charging open circuit voltage curve with the initial state of charge of 0% is taken as the modified state of charge of the single cell.
  • step S1023b if condition 9 is met, compare the calculated state of charge of the single cell, the initial state of charge of 100% discharge open circuit voltage curve corresponding to the maximum open circuit voltage state of charge and initial charge
  • the state of charge is the state of charge corresponding to the minimum open circuit voltage in the 0% charge open circuit voltage curve.
  • Condition 9 includes: the acquired current cumulative discharge capacity is greater than or equal to the maximum allowable cumulative discharge capacity corresponding to the current open circuit voltage, or the acquired current cumulative charge capacity is less than or equal to the minimum required cumulative charge capacity corresponding to the current open circuit voltage
  • the obtained current cumulative discharge capacity ⁇ DischrgCap is greater than or equal to the maximum allowable cumulative discharge capacity ⁇ MaxCap_Dischrg corresponding to the current open circuit voltage in the cumulative capacity correspondence, or the obtained current cumulative charge capacity ⁇ ChrgCap is less than or equal to the minimum requirement corresponding to the current open circuit voltage in the cumulative capacity correspondence
  • the cumulative charge capacity ⁇ MinCap_Chrg can be based on the calculated charge state of the single cell, the charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve (ie, the full charge and discharge open circuit voltage curve) where the initial state of charge is 100% State (i.e. state of charge correction maximum value) and the charge open circuit voltage curve (i.e. full-discharge open circuit voltage curve) where the initial state of charge is 0% ) Correct the calculated state of charge of the single cell through the subsequent steps S1024b to S1026b.
  • step S1024b if condition ten is satisfied, the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve with the initial state of charge of 100% is taken as the modified state of charge of the single cell.
  • Condition ten includes: the calculated state of charge of the single cell is greater than the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100%.
  • step S1025b if condition eleven is satisfied, the state of charge corresponding to the minimum open circuit voltage in the charging open circuit voltage curve with the initial state of charge of 0% is used as the state of charge for determining the correction of the single cell.
  • Condition eleven includes: the calculated state of charge of the single cell is less than the state of charge corresponding to the minimum open circuit voltage in the charging open circuit voltage curve where the initial state of charge is 0%.
  • step S1026b if condition twelve is satisfied, the calculated state of charge of the single cell is taken as the corrected state of charge of the single cell.
  • Condition twelve includes: the calculated state of charge of the single cell is less than or equal to the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100%, and greater than or equal to the initial state of charge It is the state of charge corresponding to the minimum open circuit voltage in the 0% charging open circuit voltage curve
  • the limit initial state of charge includes 100% and 0%.
  • step S1024b to step S1026b The description of correcting the calculated state of charge of the single cell in step S1024b to step S1026b is similar to step S1024a to step S1026a in the above embodiment, and can refer to the related content of step S1024a to step S1026a in the above embodiment , I won’t repeat it here.
  • the step S101 in the foregoing embodiment may specifically determine the working state of the single cell based on the comparison between the current accumulated charge capacity and the current accumulated discharge capacity of the single cell.
  • the current cumulative charging capacity of the single cell is the cumulative charging capacity of the single cell within the time period until the current moment.
  • the current cumulative discharge capacity of a single cell is the cumulative discharge capacity of the single cell within the time period until the current moment.
  • the working state of the single cell includes the discharge state. If the current cumulative charge capacity of the single cell is greater than the current cumulative discharge capacity of the single cell, it is determined that the working state of the single cell includes the charging state.
  • the difference ⁇ ChrgCap- ⁇ DischrgCap between the current cumulative charge capacity ⁇ ChrgCap of the single cell and the current cumulative discharge capacity ⁇ DischrgCap of the single cell can also be calculated. If ⁇ ChrgCap- ⁇ DischrgCap ⁇ 0, it is determined that the working state of the single cell includes the discharge state. If ⁇ ChrgCap- ⁇ DischrgCap>0, it is determined that the working state of the single cell includes the charging state.
  • the minimum resting time of a single cell can be obtained. If the resting time of the single cell exceeds the minimum resting time, the state of charge correction step in the above embodiment can be performed. If the resting time of the single cell does not exceed the minimum resting time, the state-of-charge correction step in the above embodiment will not be performed. When the resting time of the single cell exceeds the minimum resting time, proceed The state of charge correction step in the above embodiment.
  • the current temperature of the single cell can be obtained, and the minimum standing time corresponding to the current temperature can be obtained from the corresponding relationship between the pre-measured temperature and the minimum standing time.
  • the standing time of the single cell as of the current moment, and if the standing time of the single cell is greater than the minimum standing time corresponding to the current temperature, determine the working state of the single cell.
  • the corresponding relationship between the temperature and the minimum resting time can be obtained through experimental detection of single cells, battery modules, or battery packs.
  • the corresponding minimum standing time can be queried by temperature.
  • counting the resting time of the single cell up to the current moment may specifically be real-time detection of the duration T1 during which the current in the circuit where the single cell is located is continuously less than the preset current error threshold.
  • counting the standing time of the single cell up to the current moment specifically, it can be real-time detection that the current in the circuit where the single cell is located continues to be less than the preset current error threshold for the duration T1 and the cell The sum of the sleep time T2 of the battery.
  • FIG. 4 is a schematic structural diagram of a state of charge correction device in an embodiment of the application.
  • the state-of-charge correction device 200 includes a state determination module 201 and a correction module 202.
  • the state determining module 201 is used to determine the working state of a single cell, and the working state includes a discharging state or a charging state.
  • the correction module 202 is used to obtain the current open circuit voltage of the single cell, the current cumulative capacity of the obtained single cell, the corresponding relationship of the cumulative capacity corresponding to the working state of the single cell, and the limit initial state of charge
  • the corresponding open circuit voltage curve determines the corrected state of charge of the single cell, and the cumulative capacity correspondence relationship includes the corresponding relationship between the pre-measured open circuit voltage and the cumulative capacity threshold.
  • the working state of the single cell is determined, and the current open circuit voltage of the obtained single cell, the current cumulative capacity of the obtained single cell, and the working state corresponding to the single cell are determined.
  • the corresponding relationship between the accumulated capacity and the open circuit voltage curve corresponding to the limit initial state of charge are used to determine the corrected state of charge of the single cell.
  • the cumulative capacity correspondence relationship includes the correspondence relationship between the open circuit voltage measured in advance and the cumulative capacity threshold. The cumulative capacity correspondence relationship can characterize the historical operating conditions of a single cell.
  • the parameters that can guarantee the historical working condition of the single cell are introduced into the calculation process of the state of charge, that is, in the process of calculating the state of charge, the historical working condition of the single cell is considered, and the charge of the single cell is State of charge correction, which uses the corrected state of charge as the state of charge of a single cell, reduces the influence of historical operating conditions on the calculation of the state of charge, thereby improving the accuracy of the calculation of the state of charge. Moreover, since the calculated state of charge can be corrected, the applicability of the calculation of the state of charge is also improved.
  • the current accumulated capacity includes the current accumulated charge capacity and the current accumulated discharge capacity.
  • the status determination module 201 can be specifically used to: obtain the current cumulative charge capacity and current cumulative discharge capacity of the single cell; if the current cumulative charge capacity of the single cell is less than the current cumulative discharge capacity of the single cell, determine the single cell The working state of the cell includes the discharging state; if the current accumulated charging capacity of the cell is greater than the current accumulated discharging capacity of the cell, it is determined that the working state of the cell includes the charging state.
  • the state determination module is specifically used to: obtain the current temperature of the single cell, and obtain the minimum resting time corresponding to the current temperature from the corresponding relationship between the pre-measured temperature and the minimum resting time; The standing time of the single cell at the current moment, if the standing time of the single cell is greater than the minimum standing time corresponding to the current temperature, the working state of the single cell is determined.
  • FIG. 5 is a schematic structural diagram of a state-of-charge correction device in another embodiment of the application. The difference between FIG. 5 and FIG. 4 is that the state of charge correction device 200 shown in FIG. 5 may further include a first processing module 203.
  • the first processing module 203 is configured to: obtain discharge open circuit voltage curves of different initial states of charge under different discharge conditions; if the first open circuit voltage corresponds to the state of charge in the discharge open circuit voltage curve, it is at the same time as the first open circuit voltage. If the error between the corresponding states of charge in the discharge open circuit voltage curve where the initial state of charge is 100% is within the preset error accuracy range, then obtain the cumulative charge capacity and cumulative discharge capacity corresponding to the discharge open circuit voltage curve; minimize the value
  • the accumulated discharge capacity of is regarded as the minimum required accumulated discharge capacity, and the accumulated charge capacity with the largest value is regarded as the maximum allowable accumulated charge capacity.
  • the working state includes the discharge state
  • the cumulative capacity threshold includes the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity.
  • the above-mentioned correction module 202 can be specifically used to obtain the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity corresponding to the current open circuit voltage according to the cumulative capacity corresponding relationship corresponding to the discharge state of the single cell; if the current cumulative charge is obtained If the capacity is less than the maximum allowable cumulative charge capacity corresponding to the current open circuit voltage, and the obtained current cumulative discharge capacity is greater than the minimum required cumulative discharge capacity corresponding to the current open circuit voltage, then the initial state of charge is 100% in the discharge open circuit voltage curve The state of charge corresponding to the current open circuit voltage is used as the modified state of charge of the single cell.
  • the working state includes the discharge state.
  • the cumulative capacity threshold includes the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity.
  • the current accumulated capacity includes the current accumulated charge capacity and the current accumulated discharge capacity.
  • the limit initial state of charge includes 100%.
  • the above-mentioned correction module 202 can be specifically used to obtain the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity corresponding to the current open circuit voltage according to the cumulative capacity corresponding relationship corresponding to the discharge state of the single cell; if the current cumulative charge is obtained If the capacity is greater than or equal to the maximum allowable cumulative charge capacity corresponding to the current open circuit voltage, or the obtained current cumulative discharge capacity is less than or equal to the minimum required cumulative discharge capacity corresponding to the current open circuit voltage, compare the calculated state of charge and The state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100% and the state of charge corresponding to the minimum open circuit voltage in the charge open circuit voltage curve where the initial state of charge is 0%; if calculated The state of charge of a single cell is greater than the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100%, and the maximum state of charge in the discharge open circuit voltage curve where the initial state of charge is 100% The state of charge corresponding to
  • the working state includes the discharge state.
  • the cumulative capacity threshold includes the minimum required cumulative discharge capacity and the maximum allowable cumulative charge capacity.
  • the current accumulated capacity includes the current accumulated charge capacity and the current accumulated discharge capacity.
  • the limit initial state of charge includes 100% and 0%.
  • Fig. 6 is a schematic structural diagram of a state-of-charge correction device in another embodiment of the application. The difference between FIG. 6 and FIG. 4 is that the state of charge correction device 200 shown in FIG. 6 may further include a second processing module 204.
  • the second processing module 204 is used to: obtain the charging open circuit voltage curves of different initial states of charge under different charging conditions; if the second open circuit voltage corresponds to the state of charge in the charging open circuit voltage curve, it is at the same time as the second open circuit voltage.
  • the error between the corresponding states of charge in the charge open circuit voltage curve with the initial state of charge of 0% is within the preset error accuracy range, then the cumulative charge capacity and cumulative discharge capacity corresponding to the charge open circuit voltage curve are obtained; the value is maximized
  • the cumulative discharge capacity of is taken as the maximum allowable cumulative discharge capacity, and the cumulative charge capacity with the smallest value is taken as the minimum required cumulative charge capacity.
  • the working state includes the state of charge
  • the capacity increment threshold includes the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity
  • the correction module 202 can be specifically used to obtain the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity corresponding to the current open-circuit voltage according to the cumulative capacity corresponding relationship corresponding to the charging state of the single cell; if the current cumulative discharge capacity is obtained Less than the maximum allowable cumulative discharge capacity corresponding to the current open circuit voltage, and the obtained current cumulative charge capacity is greater than the minimum required cumulative charge capacity corresponding to the current open circuit voltage, then the initial state of charge is 0% of the charge open circuit voltage curve and The state of charge corresponding to the current open circuit voltage is used as the modified state of charge of the single cell.
  • the working state includes the charging state.
  • the capacity increment threshold includes the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity.
  • the current accumulated capacity includes the current accumulated charge capacity and the current accumulated discharge capacity.
  • the limit initial state of charge includes 0%.
  • the correction module 202 can be specifically used to obtain the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity corresponding to the current open circuit voltage according to the cumulative capacity corresponding relationship corresponding to the discharge state of the single cell; if the current cumulative discharge capacity is obtained Is greater than or equal to the maximum allowable cumulative discharge capacity corresponding to the current open circuit voltage, or the obtained current cumulative charge capacity is less than or equal to the minimum required cumulative charge capacity corresponding to the current open circuit voltage, then compare the calculated state of charge and The state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100% and the state of charge corresponding to the minimum open circuit voltage in the charge open circuit voltage curve where the initial state of charge is 0%; if the single calculated The state of charge of the bulk cell is greater than the state of charge corresponding to the maximum open circuit voltage in the discharge open circuit voltage curve where the initial state of charge is 100%, and the maximum open circuit in the discharge open circuit voltage curve where the initial state of charge is 100% The state of charge corresponding to the voltage is used as the
  • the working state includes the charging state.
  • the capacity increment threshold includes the maximum allowable cumulative discharge capacity and the minimum required cumulative charge capacity.
  • the current accumulated capacity includes the current accumulated charge capacity and the current accumulated discharge capacity.
  • the limit initial state of charge includes 100% and 0%.
  • the current accumulated capacity is the accumulated capacity in the time period up to the current moment, and the time period up to the current moment does not include the resting time.
  • the cumulative capacity threshold is calculated in a preset time period, and the preset time period does not include the resting time.
  • FIG. 7 is a schematic structural diagram of a state-of-charge correction device in an embodiment of this application.
  • the state of charge correction device 300 includes a memory 301, a processor 302 and a program stored in the memory 301 and running on the processor 302.
  • the aforementioned processor 302 may include a central processing unit (CPU), or a specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.
  • CPU central processing unit
  • ASIC specific integrated circuit
  • the memory 301 may include mass storage for data or instructions.
  • the memory 301 may include a HDD, a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these.
  • the storage 301 may include removable or non-removable (or fixed) media.
  • the memory 301 can be opened inside or outside the state-of-charge correction device 300 at the terminal hotspot.
  • the memory 301 is a non-volatile solid state memory.
  • the memory 301 includes read only memory (ROM).
  • the ROM can be mask-programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), electrically rewritable ROM (EAROM) or flash memory or A combination of two or more of these.
  • the processor 302 reads the executable program code stored in the memory 301 to run a program corresponding to the executable program code, so as to implement the state-of-charge correction method in the foregoing embodiment.
  • the state of charge correction device 300 may further include a communication interface 303 and a bus 304. Among them, as shown in FIG. 7, the memory 301, the processor 302, and the communication interface 303 are connected through a bus 304 and complete mutual communication.
  • the communication interface 303 is mainly used to implement communication between various modules, devices, units and/or devices in the embodiments of the present application.
  • the input device and/or output device can also be accessed through the communication interface 303.
  • the bus 304 includes hardware, software, or both, and couples the components of the state-of-charge correction device 300 to each other.
  • the bus 304 may include an accelerated graphics port (AGP) or other graphics bus, an enhanced industry standard architecture (EISA) bus, a front side bus (FSB), a hypertransport (HT) interconnect, an industry standard architecture (ISA) ) Bus, unlimited bandwidth interconnect, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnect (PCI) bus, PCI-Express (PCI-X) bus, serial advanced Technical Attachment (SATA) bus, Video Electronics Standards Association Local (VLB) bus or other suitable bus or a combination of two or more of these.
  • the bus 304 may include one or more buses.
  • An embodiment of the present application also provides a storage medium with a program stored on the storage medium, and when the program is executed by a processor, the state of charge correction method in the foregoing embodiment can be implemented.

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Abstract

一种荷电状态修正方法及装置。其中的荷电状态修正方法，包括：确定单体电芯的工作状态，工作状态包括放电状态或充电状态（S101）；根据获取的单体电芯的当前开路电压、获取的单体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系和极限起始荷电状态对应的开路电压曲线，确定单体电芯修正的荷电状态，累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系（S102）。利用提出的技术方案能够提高荷电状态计算的精确度。

Description

荷电状态修正方法及装置
相关申请的交叉引用
本申请要求享有于2019年6月24日提交的名称为“荷电状态修正方法及装置”的中国专利申请201910547582.8的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请属于电池技术领域，尤其涉及一种荷电状态修正方法及装置。
背景技术
荷电状态(State of Charge，SOC)用于表示电池的剩余可放电电量与电池完全充电状态的电量的比值。SOC的计算是电池管理系统最重要的功能之一，描述了电池的当前状态。
目前常用的SOC计算方法包括安时积分法、开路电压法、神经网络法等等。其中，开路电压法可利用开路电压(Open Circuit Voltage，OCV)和SOC的对应关系得到稳定的电池的SOC。但是，在开路电压法中，要求电池不存在滞回特性。滞回特性指在相同的SOC和温度的情况下，充电OCV曲线与放电OCV曲线不重合，即OCV曲线受到历史工况影响的一种情况。若利用开路电压法计算具有滞回特性的电池的SOC，会导致开路电压法计算出的电池的SOC误差较大，降低了计算出的SOC的精确度。
申请内容
本申请实施例提供了一种荷电状态修正方法及装置，能够提高荷电状态计算的精确度。
第一方面，本申请实施例提供了一种荷电状态修正方法，包括：确定单体电芯的工作状态，工作状态包括放电状态或充电状态；根据获取的单 体电芯的当前开路电压、获取的单体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系，以及极限起始荷电状态对应的开路电压曲线，确定单体电芯修正的荷电状态，累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。
第二方面，本申请实施例提供了一种荷电状态修正装置，包括：状态确定模块，用于确定单体电芯的工作状态，工作状态包括放电状态或充电状态；修正模块，用于根据获取的单体电芯的当前开路电压、获取的单体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系、以及极限起始荷电状态对应的开路电压曲线，确定单体电芯修正的荷电状态，累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。
在本申请实施例中，确定单体电芯的工作状态，并根据获取的单体电芯的当前开路电压、获取的单体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系，以及极限起始荷电状态对应的开路电压曲线，来确定单体电芯修正的荷电状态。其中，累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。累计容量对应关系可以表征单体电芯的历史工况。将可以保证单体电芯的历史工况的参数引入到荷电状态的计算过程中，即在计算荷电状态的过程中，考虑单体电芯的历史工况，对单体电芯的荷电状态修正，将修正的荷电状态作为单体电芯的荷电状态，减小历史工况对计算荷电状态的影响，从而提高了荷电状态计算的精确度。
附图说明
从下面结合附图对本申请的具体实施方式的描述中可以更好地理解本申请其中，相同或相似的附图标记表示相同或相似的特征。
图1为本申请一实施例中一种荷电状态修正方法的流程图；
图2为本申请另一实施例中一种荷电状态修正方法的流程图；
图3为本申请又一实施例中一种荷电状态修正方法的流程图；
图4为本申请一实施例中一种荷电状态修正装置的结构示意图；
图5为本申请另一实施例中一种荷电状态修正装置的结构示意图；
图6为本申请又一实施例中一种荷电状态修正装置的结构示意图；
图7为本申请实施例中一种荷电状态修正设备的结构示意图。
具体实施方式
下面将详细描述本申请的各个方面的特征和示例性实施例。在下面的详细描述中，提出了许多具体细节，以便提供对本申请的全面理解。但是，对于本领域技术人员来说很明显的是，本申请可以在不需要这些具体细节中的一些细节的情况下实施。下面对实施例的描述仅仅是为了通过示出本申请的示例来提供对本申请的更好的理解。本申请决不限于下面所提出的任何具体配置和算法，而是在不脱离本申请的精神的前提下覆盖了元素、部件和算法的任何修改、替换和改进。在附图和下面的描述中，没有示出公知的结构和技术，以便避免对本申请造成不必要的模糊。
本申请实施例可提供一种荷电状态修正方法及装置，可应用于对电池的荷电状态进行计算的场景中，由电池管理系统(Battery Management System，BMS)执行。在本申请实施例中，可针对单体电芯的荷电状态进行修正，电池模组和电池包的荷电状态也可根据单体电芯的荷电状态确定，在此并不赘述。采用本申请实施例中的荷电状态修正方法及装置，可对具有滞回特性的单体电芯的荷电状态进行修正，以提高计算得到的具有滞回特性的单体电芯的荷电状态的精确度。
图1为本申请一实施例中一种荷电状态修正方法的流程图。如图1所示，该荷电状态修正方法包括步骤S101和步骤S102。
在步骤S101中，确定单体电芯的工作状态。
其中，工作状态包括放电状态或充电状态。单体电芯处于的工作状态为放电状态，则单体电芯正在进行放电，或者在最近的一段时间内，单体电芯以放电为主。比如，在长时间放电的过程中，存在极少时间在回充的情况，也认为单体电芯处于的工作状态为放电状态。单体电芯处于的工作状态为充电状态，则单体电芯正在进行充电，或者在最近的一段时间内，单体电芯以充电为主。比如，在长时间充电的过程中，存在极少时间在放 电的情况，也认为单体电芯处于的工作状态为充电状态。
在步骤S102中，根据获取的单体电芯的当前开路电压、获取的单体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系，以及极限起始荷电状态对应的开路电压曲线，确定单体电芯修正的荷电状态。
单体电芯的当前开路电压为单体电芯的当前时刻的开路电压(Open Circuit Voltage，OCV)。单体电芯的当前累计容量为单体电芯的截止到当前时刻的时间段内的累计容量。截止到当前时刻的时间段不包括静置时间。静置时间为单体电芯没有处于工作状态的时间，或者单体电芯所在的电路中电流持续小于预设电流阈值的时间。需要说明的是，静置时间可累计计算。累计容量包括累计充电容量和累计放电容量。累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。也可以说，累计容量对应关系指示的是在历史工况中不同的开路电压与累计容量阈值的对应关系。累计容量阈值为允许或要求的累计容量的最大值或最小值，是在预设时间段内统计得到的，预设时间段不包括静置时间。极限起始荷电状态可包括100％和/或0％。若极限起始荷电状态包括100％，则极限起始荷电状态对应的开路电压曲线为起始荷电状态为100％的放电开路电压曲线，即满充放电开路电压曲线(即满充放电OCV曲线)。开路电压曲线表征开路电压与荷电状态(State of Charge，SOC)之间的对应关系。需要说明的是，在本申请实施例中，并不限于开路电压曲线的利用，其他可指示开路电压与荷电状态之间的对应关系的形式，比如表格等也适用于本申请中。
在一些示例中，可通过获取的单体电芯的当前开路电压和与单体电芯的工作状态对应的开路电压曲线，查询得到与当前开路电压对应的累计容量阈值。再通过获取的单体电芯的当前累计容量、与当前开路电压对应的累计容量阈值和极限起始荷电状态对应的开路电压曲线，确定单体电芯修正的荷电状态。修正后的荷电状态的精准度更高。
单体电芯修正的荷电状态用于替换计算得到的单体电芯的荷电状态，计算得到的单体电芯的荷电状态即为采用实时荷电状态计算法计算出的荷 电状态，比如，利用开路电压法、神经网络法、卡尔曼滤波法等方法计算出的荷电状态。由于实时荷电状态计算法计算出的荷电状态可能存在较大的误差，因此可采用本申请实施例中的荷电状态修正方法进行修正，得到的单体电芯修正的荷电状态精准度更高。
在本申请实施例中，确定单体电芯的工作状态，并根据获取的单体电芯的当前开路电压、获取的单体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系，以及极限起始荷电状态对应的开路电压曲线，来确定单体电芯修正的荷电状态。其中，累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。累计容量对应关系可以表征单体电芯的历史工况。将可以保证单体电芯的历史工况的参数引入到荷电状态的计算过程中，即在计算荷电状态的过程中，考虑单体电芯的历史工况，对单体电芯的荷电状态修正，将修正的荷电状态作为单体电芯的荷电状态，减小历史工况对计算荷电状态的影响，从而提高了荷电状态计算的精确度。而且，由于可对计算得到的荷电状态进行修正，也提高了荷电状态的计算的适用性。
图2为本申请另一实施例中一种荷电状态修正方法的流程图。其中，单体电芯的工作状态包括放电状态。对应的，累计容量阈值包括最小要求累计放电容量和最大容许累计充电容量。图2与图1的不同之处在于，图2所示的荷电状态修正方法还可包括步骤S103a、步骤S104a和步骤S105a。上述实施例中的步骤S102可具体细化为步骤S1021a至步骤S1026a。
在步骤S103a中，获取不同放电条件下的不同起始荷电状态的放电开路电压曲线。
在一些示例中，放电条件包括放电倍率、测试工况等。比如，测试工况为放电后回充工况等。在同一放电条件下可设置不同的起始荷电状态，比如，将单体电芯满放后充电到不同的荷电状态，将单体电芯满放后充电得到的不同的荷电状态作为起始荷电状态。以起始荷电状态为起点，在同一放电条件下，对单体电芯进行放电。
比如，将单体电芯放电放空后将单体电芯充电至荷电状态为60％，将 荷电状态60％作为该单体电芯的起始荷电状态，对该单体电芯进行放电，得到起始荷电状态为60％的单体电芯的放电开路电压曲线。具体的，可对起始荷电状态为60％的单体电芯每次放电6％，再回充1％，直至单体电芯的荷电状态为0％。
又比如，将单体电芯放电放空后将单体电芯充电至荷电状态为80％，将荷电状态80％作为该单体电芯的起始荷电状态，对该单体电芯进行放电，得到起始荷电状态为80％的单体电芯的放电开路电压曲线。具体的，可对起始荷电状态为80％的单体电芯每次放电7％，再回充2％，直至单体电芯的荷电状态为0％。
同一个放电条件下的一个起始荷电状态对应一条放电开路电压曲线。不同放电条件下的不同起始荷电状态对应多条放电开路电压曲线。
需要说明的是，同一个放电条件指的是放电条件中的因素均相同。比如，放电条件包括放电倍率和测试工况，若放电条件A1和放电条件A2为同一个放电条件，则放电条件A1和放电条件A2中的放电倍率相同，测试工况也相同。
在步骤S104a中，若满足条件一，则获取放电开路电压曲线所对应的累计充电容量和累计放电容量。
条件一包括：第一开路电压在放电开路电压曲线中对应的荷电状态，与第一开路电压在起始荷电状态为100％的放电开路电压曲线中对应的荷电状态之间的误差在预设误差精度范围内。
取第一开路电压，在每条放电开路电压曲线中查找与该第一开路电压对应的荷电状态。本申请实施例中的极限起始荷电状态包括100％。针对每条放电开路电压曲线中与第一开路电压对应的荷电状态，与起始荷电状态为100％的放电开路电压曲线(即满充放电开路电压曲线)中与第一开路电压对应的荷电状态的误差进行检测。预设误差精度范围为荷电状态计算过程中可接受的误差精度的范围。误差在预设误差精度范围内，表示放电开路电压曲线中的荷电状态并未出现对荷电状态的计算超出接受程度的影响，根据该放电开路曲线所获取的数据的精确度较高。因此，可利用该放电开路曲线获取累计容量阈值，以建立累计容量对应关系。
在步骤S105a中，将值最小的累计放电容量作为最小要求累计放电容量，将值最大的累计充电容量作为最大容许累计充电容量。
在步骤S104a中可能会得到多条满足预设误差精度范围的放电开路电压曲线，每条放电开路曲线对应有累计放电容量和累计充电容量。将多条放电开路曲线对应的累计放电容量中的最小值作为最小要求累计放电容量。将多条放电开路曲线对应的累计放电容量中的最大值作为最大容许累计充电容量。
其中，最小要求累计放电容量为为了避免放电开路曲线受到历史工况影响单体电芯至少需要放出的放电容量。若累计放电容量小于最小要求累计放电容量，不能保证此时的放电开路曲线与满充放电的开路电压曲线重合或足够接近。最大容许累计充电容量为为了避免放电开路曲线受到历史工况影响单体电芯至多能够充入的充电容量。
在步骤S1021a中，根据与单体电芯的放电状态对应的累计容量对应关系，得到与当前开路电压对应的最小要求累计放电容量和最大容许累计充电容量。
上述实施例中的累计容量对应关系包括预先测量的开路电压与最小要求累计放电容量和最大容许累计充电容量的对应关系。比如，累计容量对应关系可用表格的形式体现。表一为本申请实施例中累计容量对应关系表格：
表一
Figure PCTCN2020086198-appb-000001
其中，表一中记录了放电状态下的五个开路电压OCV1、OCV2、OCV3、OCV4和OCV5分别对应的最小要求累计放电容量和最大容许累计充电容量。在表一中可根据开路电压查询对应的最小要求累计放电容量和最大容许累计充电容量。比如，单体电芯的当前开路电压为OCV3，则 开路电压OCV3对应最小要求累计放电容量B3和最大容许累计充电容量C3。
在步骤S1022a中，若满足条件二，则将起始荷电状态为100％的放电开路电压曲线中与当前开路电压对应的荷电状态作为单体电芯修正的荷电状态。
条件二包括：获取的当前累计充电容量小于与当前开路电压对应的最大容许累计充电容量，且获取的当前累计放电容量大于与当前开路电压对应的最小要求累计放电容量。
其中，极限起始荷电状态包括100％。
上述实施例中的单体电芯的当前累计容量包括当前累计充电容量ΔChrgCap和当前累计放电容量ΔDischrgCap。获取的当前累计充电容量ΔChrgCap小于累计容量对应关系中与当前开路电压对应的最大容许累计充电容量ΔMaxCap_Chrg，获取的当前累计放电容量ΔDischrgCap大于累计容量对应关系中与当前开路电压对应的最小要求累计放电容量ΔMinCap_Dischrg，则可直接利用起始荷电状态为100％的放电开路电压曲线(即满充放电开路电压曲线)来修正单体电芯的荷电状态。具体的，将起始荷电状态为100％的放电开路电压曲线中与当前开路电压对应的荷电状态作为单体电芯修正的荷电状态。
在步骤S1023a中，若满足条件三，则对比计算得到的单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态和起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态。
条件三包括：获取的当前累计充电容量大于等于与当前开路电压对应的最大容许累计充电容量，或获取的当前累计放电容量小于等于与当前开路电压对应的最小要求累计放电容量。
获取的当前累计充电容量ΔChrgCap大于等于累计容量对应关系中与当前开路电压对应的最大容许累计充电容量ΔMaxCap_Chrg，或获取的当前累计放电容量ΔDischrgCap小于等于累计容量对应关系中与当前开路电压对应的最小要求累计放电容量ΔMinCap_Dischrg，则可基于计算得到的 单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线(即满充放电开路电压曲线)中最大开路电压对应的荷电状态(即荷电状态修正最大值)和起始荷电状态为0％的充电开路电压曲线(即满放充电开路电压曲线)中最小开路电压对应的荷电状态(即荷电状态修正最小值)通过后续的步骤S1024a至步骤S1026a对计算得到的单体电芯的荷电状态进行修正。
在步骤S1024a中，若满足条件四，则将起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态作为单体电芯修正的荷电状态。
条件四包括：计算得到的单体电芯的荷电状态，大于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态。
在步骤S1025a中，若满足条件五，则将起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态作为单体电芯修正的荷电状态。
条件五包括：计算得到的单体电芯的荷电状态，小于起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态。
在步骤S1026a中，若满足条件六，则将计算得到的单体电芯的荷电状态作为单体电芯修正的荷电状态。
条件六包括：计算得到的单体电芯的荷电状态，小于等于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，且大于等于起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态。
其中，极限起始荷电状态包括100％和0％。
荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态和起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态限定了修正的荷电状态的范围。其中，荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态作为修正的荷电状态的范围的上限，起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态作为修正的荷电状态的范围的下限。
若计算得到的单体电芯的荷电状态位于上述修正的荷电状态的范围内，标识该计算得到的单体电芯的荷电状态较为准确，可将该计算得到的单体电芯的荷电状态作为单体电芯修正的荷电状态。若计算得到的单体电芯的荷电状态大于上述修正的荷电状态的范围的上限，则将单体电芯的荷电状态修正为上述修正的荷电状态的范围的上限，即将上述修正的荷电状态的范围的上限作为单体电芯修正的荷电状态。若计算得到的单体电芯的荷电状态小于上述修正的荷电状态的范围的下限，则将单体电芯的荷电状态修正为上述修正的荷电状态的范围的下限，即将上述修正的荷电状态的范围的下限作为单体电芯修正的荷电状态。
图3为本申请又一实施例中一种荷电状态修正方法的流程图。其中，单体电芯的工作状态包括充电状态。对应的，所述容量增量阈值包括最大容许累计放电容量和最小要求累计充电容量。图3与图1的不同之处在于，图3所示的荷电状态修正方法还可包括步骤S103b、步骤S104b和步骤S105b。上述实施例中的步骤S102可具体细化为步骤S1021b至步骤S1026b。
在步骤S103b中，获取不同充电条件下的不同起始荷电状态的充电开路电压曲线。
在一些示例中，充电条件包括充电倍率、测试工况等。比如，测试工况为充电后放电工况等。在同一个充电条件下可设置不同的起始荷电状态，比如，将单体电芯满充后放电到不同的荷电状态，将单体电芯满充后放电得到的不同的荷电状态作为起始荷电状态。以起始荷电状态为起点，在同一个充电条件下，对单体电芯进行充电。
比如，将单体电芯充电充满后将单体电芯放电至荷电状态为40％，将荷电状态40％作为该单体电芯的起始荷电状态，对该单体电芯进行充电，得到起始荷电状态为40％的单体电芯的充电开路电压曲线。具体的，可对起始荷电状态为40％的单体电芯每次充电6％，再放电1％，直至单体电芯的荷电状态为100％。
又比如，将单体电芯充电充满后将单体电芯放电至荷电状态为60％，将荷电状态60％作为该单体电芯的起始荷电状态，对该单体电芯进行充 电，得到起始荷电状态为60％的单体电芯的充电开路电压曲线。具体的，可对起始荷电状态为60％的单体电芯每次充电7％，再放电2％，直至单体电芯的荷电状态为100％。
同一个充电条件下的一个起始荷电状态对应一条充电开路电压曲线。不同放电条件下的不同起始荷电状态对应多条充电开路电压曲线。
需要说明的是，同一个充电条件指的是充电条件中的因素均相同。比如，充电条件包括充电倍率和测试工况，若充电条件D1和充电条件D2为同一个充电条件，则充电条件D1和充电条件D2中的充电倍率相同，测试工况也相同。
在步骤S104b中，若满足条件七，则获取充电开路电压曲线所对应的累计充电容量和累计放电容量。
条件七包括：第二开路电压在充电开路电压曲线中对应的荷电状态，与第二开路电压在起始荷电状态为0％的充电开路电压曲线中对应的荷电状态之间的误差在预设误差精度范围内。
取第二开路电压，在每条充电开路电压曲线中查找与该第二开路电压对应的荷电状态。本申请实施例中的极限起始荷电状态包括0％。针对每条充电开路电压曲线中与第二开路电压对应的荷电状态，与起始荷电状态为0％的充电开路电压曲线(即满放充电开路电压曲线)中与第二开路电压对应的荷电状态的误差进行检测。预设误差精度范围为荷电状态计算过程中可接受的误差精度的范围。误差在预设误差精度范围内，表示充电开路电压曲线中的荷电状态并未出现对荷电状态的计算超出接受程度的影响，根据该充电开路曲线所获取的数据的精确度较高。因此，可利用该充电开路曲线获取累计容量阈值，以建立累计容量对应关系。
在步骤S105b中，将值最大的累计放电容量作为最大容许累计放电容量，将值最小的累计充电容量作为最小要求累计充电容量。
在步骤S104b中可能会得到多条满足预设误差精度范围的充电开路电压曲线，每条充电开路曲线对应有累计放电容量和累计充电容量。将多条充电开路曲线对应的累计放电容量中的最大值作为最大容许累计放电容量。将多条充电开路曲线对应的累计充电容量中的最小值作为最小要求累 计充电容量。
其中，最大容许累计放电容量为为了避免充电开路曲线受到历史工况影响单体电芯至多能够放出的放电容量。最小要求累计充电容量为为了避免充电开路曲线受到历史工况影响单体电芯至少需要充入的充电容量。若累计充电容量小于最小要求累计充电容量，不能保证此时的充电开路曲线与满放充电的开路电压曲线重合或足够接近。
在步骤S1021b中，根据与单体电芯的充电状态对应的累计容量对应关系，得到与当前开路电压对应的最大容许累计放电容量和最小要求累计充电容量。
上述实施例中的累计容量对应关系包括预先测量的开路电压与最大容许累计放电容量和最小要求累计充电容量的对应关系。比如，累计容量对应关系可用表格的形式体现。表二为本申请实施例中累计容量对应关系表格：
表二
Figure PCTCN2020086198-appb-000002
其中，表二中记录了充电状态下的五个开路电压OCV1、OCV2、OCV3、OCV4和OCV5分别对应的最小要求累计充电容量和最大容许累计放电容量。在表二中可根据开路电压查询对应的最小要求累计充电容量和最大容许累计放电容量。比如，单体电芯的当前开路电压为OCV2，则开路电压OCV2对应最小要求累计充电容量E2和最大容许累计放电容量F2。
在步骤S1022b中，若满足条件八，则将起始荷电状态为0％的充电开路电压曲线中与当前开路电压对应的荷电状态作为单体电芯修正的荷电状态。
条件八包括：获取的当前累计放电容量小于与当前开路电压对应的最 大容许累计放电容量，且获取的当前累计充电容量大于与当前开路电压对应的最小要求累计充电容量。
其中，极限起始荷电状态包括0％。
上述实施例中的单体电芯的当前累计容量包括当前累计充电容量ΔChrgCap和当前累计放电容量ΔDischrgCap。获取的当前累计放电容量ΔDischrgCap小于累计容量对应关系中与当前开路电压对应的最大容许累计放电容量ΔMaxCap_Dischrg，获取的当前累计充电容量ΔChrgCap大于累计容量对应关系中与当前开路电压对应的最小要求累计充电容量ΔMinCap_Chrg，则可直接利用起始荷电状态为0％的充电开路电压曲线(即满放充电开路电压曲线)来修正单体电芯的荷电状态。具体的，将起始荷电状态为0％的充电开路电压曲线中与当前开路电压对应的荷电状态作为单体电芯修正的荷电状态。
在步骤S1023b中，若满足条件九，则对比计算得到的单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态和起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态。
条件九包括：获取的当前累计放电容量大于等于与当前开路电压对应的最大容许累计放电容量，或获取的当前累计充电容量小于等于与当前开路电压对应的最小要求累计充电容量
获取的当前累计放电容量ΔDischrgCap大于等于累计容量对应关系中与当前开路电压对应的最大容许累计放电容量ΔMaxCap_Dischrg，或获取的当前累计充电容量ΔChrgCap小于等于累计容量对应关系中与当前开路电压对应的最小要求累计充电容量ΔMinCap_Chrg，则可基于计算得到的单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线(即满充放电开路电压曲线)中最大开路电压对应的荷电状态(即荷电状态修正最大值)和起始荷电状态为0％的充电开路电压曲线(即满放充电开路电压曲线)中最小开路电压对应的荷电状态(即荷电状态修正最小值)通过后续的步骤S1024b至步骤S1026b对计算得到的单体电芯的荷电状态进行修正。
在步骤S1024b中，若满足条件十，则将起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态作为单体电芯修正的荷电状态。
条件十包括：计算得到的单体电芯的荷电状态，大于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态。
在步骤S1025b中，若满足条件十一，则将起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态作为确定单体电芯修正的荷电状态。
条件十一包括：计算得到的单体电芯的荷电状态，小于起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态。
在步骤S1026b中，若满足条件十二，则将计算得到的单体电芯的荷电状态作为单体电芯修正的荷电状态。
条件十二包括：计算得到的单体电芯的荷电状态，小于等于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，且大于等于起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态
其中，极限起始荷电状态包括100％和0％。
步骤S1024b至步骤S1026b中对计算得到的单体电芯的荷电状态进行修正的说明与上述实施例中的步骤S1024a至步骤S1026a相似，可参见上述实施例中的步骤S1024a至步骤S1026a的相关内容，在此不再赘述。
在另一些实施例中，上述实施例中的步骤S101具体可根据单体电芯的当前累计充电容量和当前累计放电容量的对比，确定单体电芯的工作状态。单体电芯的当前累计充电容量为单体电芯截止到当前时刻的时间段内的累计充电容量。单体电芯的当前累计放电容量为单体电芯截止到当前时刻的时间段内的累计放电容量。
比如，若单体电芯的当前累计充电容量小于单体电芯的当前累计放电容量，则确定单体电芯的工作状态包括放电状态。若单体电芯的当前累计充电容量大于单体电芯的当前累计放电容量，则确定单体电芯的工作状态包括充电状态。
具体的，也可计算单体电芯的当前累计充电容量ΔChrgCap与单体电芯的当前累计放电容量ΔDischrgCap的差ΔChrgCap-ΔDischrgCap。若ΔChrgCap-ΔDischrgCap＜0，则确定单体电芯的工作状态包括放电状态。若ΔChrgCap-ΔDischrgCap＞0，则确定单体电芯的工作状态包括充电状态。
在又一些实施例中，为了进一步提高荷电状态计算的精确度，需要保证单体电芯的静置时间足够长，以保证在荷电状态计算过程中获取的参数的准确定。在本申请实施例中，可得到单体电芯的最小静置时长，若该单体电芯的静置时长超过最小静置时长，则可进行上述实施例中的荷电状态修正步骤。若该单体电芯的静置时长未超过最小静置时长，则不会进行上述实施例中的荷电状态修正步骤，待该单体电芯的静置时长超过最小静置时长，再进行上述实施例中的荷电状态修正步骤。
具体的，可获取单体电芯的当前温度，在预先测量得到的温度与最小静置时间的对应关系中得到与当前温度对应的最小静置时长。获取截止到当前时刻的单体电芯的静置时长，若单体电芯的静置时长大于与当前温度对应的最小静置时长，则确定单体电芯的工作状态。
其中，温度与最小静置时间的对应关系可通过单体电芯或电池模组或电池包的实验检测获得。在温度与最小静置时间的对应关系中，通过温度可查询到对应的最小静置时间。
在一些示例中，统计截止到当前时刻的单体电芯的静置时长，具体可为实时检测单体电芯所在的电路中的电流持续小于预设电流误差阈值的持续时长T1。
在另一些示例中，统计截止到当前时刻的单体电芯的静置时长，具体可为实时检测单体电芯所在的电路中的电流持续小于预设电流误差阈值的持续时长T1与单体电芯的休眠时间T2之和。
图4为本申请一实施例中一种荷电状态修正装置的结构示意图。如图4所示，该荷电状态修正装置200包括状态确定模块201和修正模块202。
状态确定模块201，用于确定单体电芯的工作状态，工作状态包括放电状态或充电状态。
修正模块202，用于根据获取的单体电芯的当前开路电压、获取的单 体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系和极限起始荷电状态对应的开路电压曲线，确定单体电芯修正的荷电状态，累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。
在本申请实施例中，确定单体电芯的工作状态，并根据获取的单体电芯的当前开路电压、获取的单体电芯的当前累计容量、与单体电芯的工作状态对应的累计容量对应关系和极限起始荷电状态对应的开路电压曲线，来确定单体电芯修正的荷电状态。其中，累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。累计容量对应关系可以表征单体电芯的历史工况。将可以保证单体电芯的历史工况的参数引入到荷电状态的计算过程中，即在计算荷电状态的过程中，考虑单体电芯的历史工况，对单体电芯的荷电状态修正，将修正的荷电状态作为单体电芯的荷电状态，减小历史工况对计算荷电状态的影响，从而提高了荷电状态计算的精确度。而且，由于可对计算得到的荷电状态进行修正，也提高了荷电状态的计算的适用性。
在一些示例中，当前累计容量包括当前累计充电容量和当前累计放电容量。状态确定模块201可具体用于：获取单体电芯的当前累计充电容量和当前累计放电容量；若单体电芯的当前累计充电容量小于单体电芯的当前累计放电容量，则确定单体电芯的工作状态包括放电状态；若单体电芯的当前累计充电容量大于单体电芯的当前累计放电容量，则确定单体电芯的工作状态包括充电状态。
在一些示例中，状态确定模块具体用于：获取单体电芯的当前温度，在预先测量得到的温度与最小静置时间的对应关系中得到与当前温度对应的最小静置时长；获取截止到当前时刻的单体电芯的静置时长，若单体电芯的静置时长大于与当前温度对应的最小静置时长，则确定单体电芯的工作状态。
图5为本申请另一实施例中一种荷电状态修正装置的结构示意图。图5与图4的不同之处在于，图5所示的荷电状态修正装置200还可包括第一处理模块203。
第一处理模块203用于：获取不同放电条件下的不同起始荷电状态的放电开路电压曲线；若第一开路电压在放电开路电压曲线中对应的荷电状态，与第一开路电压在起始荷电状态为100％的放电开路电压曲线中对应的荷电状态之间的误差在预设误差精度范围内，则获取放电开路电压曲线所对应的累计充电容量和累计放电容量；将值最小的累计放电容量作为最小要求累计放电容量，将值最大的累计充电容量作为最大容许累计充电容量。其中，工作状态包括放电状态，累计容量阈值包括最小要求累计放电容量和最大容许累计充电容量。
上述修正模块202可具体用于：根据与单体电芯的放电状态对应的累计容量对应关系，得到与当前开路电压对应的最小要求累计放电容量和最大容许累计充电容量；若获取的当前累计充电容量小于与当前开路电压对应的最大容许累计充电容量，且获取的当前累计放电容量大于与当前开路电压对应的最小要求累计放电容量，则将起始荷电状态为100％的放电开路电压曲线中与当前开路电压对应的荷电状态作为单体电芯修正的荷电状态。
其中，工作状态包括放电状态。累计容量阈值包括最小要求累计放电容量和最大容许累计充电容量。当前累计容量包括当前累计充电容量和当前累计放电容量。极限起始荷电状态包括100％。
上述修正模块202可具体用于：根据与单体电芯的放电状态对应的累计容量对应关系，得到与当前开路电压对应的最小要求累计放电容量和最大容许累计充电容量；若获取的当前累计充电容量大于等于与当前开路电压对应的最大容许累计充电容量，或获取的当前累计放电容量小于等于与当前开路电压对应的最小要求累计放电容量，则对比计算得到的单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态和起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态；若计算得到的单体电芯的荷电状态，大于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，则将起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态作为单体电芯修正的荷电状态；若计算得到的单体电芯的荷电状态，小于 起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态作为单体电芯修正的荷电状态；若计算得到的单体电芯的荷电状态，小于等于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，且大于等于起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将计算得到的单体电芯的荷电状态作为单体电芯修正的荷电状态。
其中，工作状态包括放电状态。累计容量阈值包括最小要求累计放电容量和最大容许累计充电容量。当前累计容量包括当前累计充电容量和当前累计放电容量。极限起始荷电状态包括100％和0％。
图6为本申请又一实施例中一种荷电状态修正装置的结构示意图。图6与图4的不同之处在于，图6所示的荷电状态修正装置200还可包括第二处理模块204。
第二处理模块204用于：获取不同充电条件下的不同起始荷电状态的充电开路电压曲线；若第二开路电压在充电开路电压曲线中对应的荷电状态，与第二开路电压在起始荷电状态为0％的充电开路电压曲线中对应的荷电状态之间的误差在预设误差精度范围内，则获取充电开路电压曲线所对应的累计充电容量和累计放电容量；将值最大的累计放电容量作为最大容许累计放电容量，将值最小的累计充电容量作为最小要求累计充电容量。
其中，工作状态包括充电状态，容量增量阈值包括最大容许累计放电容量和最小要求累计充电容量。
修正模块202可具体用于：根据与单体电芯的充电状态对应的累计容量对应关系，得到与当前开路电压对应的最大容许累计放电容量和最小要求累计充电容量；若获取的当前累计放电容量小于与当前开路电压对应的最大容许累计放电容量，且获取的当前累计充电容量大于与当前开路电压对应的最小要求累计充电容量，则将起始荷电状态为0％的充电开路电压曲线中与当前开路电压对应的荷电状态作为单体电芯修正的荷电状态。
其中，工作状态包括充电状态。容量增量阈值包括最大容许累计放电 容量和最小要求累计充电容量。当前累计容量包括当前累计充电容量和当前累计放电容量。极限起始荷电状态包括0％。
修正模块202可具体用于：根据与单体电芯的放电状态对应的累计容量对应关系，得到与当前开路电压对应的最大容许累计放电容量和最小要求累计充电容量；若获取的当前累计放电容量大于等于与当前开路电压对应的最大容许累计放电容量，或获取的当前累计充电容量小于等于与当前开路电压对应的最小要求累计充电容量，则对比计算得到的单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态和起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态；若计算得到的单体电芯的荷电状态，大于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，则将起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态作为单体电芯修正的荷电状态；若计算得到的单体电芯的荷电状态，小于起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态作为确定单体电芯修正的荷电状态；若计算得到的单体电芯的荷电状态，小于等于起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，且大于等于起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将计算得到的单体电芯的荷电状态作为单体电芯修正的荷电状态。
其中，工作状态包括充电状态。容量增量阈值包括最大容许累计放电容量和最小要求累计充电容量。当前累计容量包括当前累计充电容量和当前累计放电容量。极限起始荷电状态包括100％和0％。
在一些示例中，当前累计容量为截止到当前时刻的时间段内的累计容量，截止到当前时刻的时间段不包括静置时间。
累计容量阈值在预设时间段内统计得到，预设时间段不包括静置时间。
图7为本申请实施例中一种荷电状态修正设备的结构示意图。如图7所示，荷电状态修正设备300包括存储器301、处理器302及存储在存储器301上并可在处理器302上运行的程序。
在一个示例中，上述处理器302可以包括中央处理器(CPU)，或者特定集成电路(ASIC)，或者可以被配置成实施本申请实施例的一个或多个集成电路。
存储器301可以包括用于数据或指令的大容量存储器。举例来说而非限制，存储器301可包括HDD、软盘驱动器、闪存、光盘、磁光盘、磁带或通用串行总线(USB)驱动器或者两个或更多个以上这些的组合。在合适的情况下，存储器301可包括可移除或不可移除(或固定)的介质。在合适的情况下，存储器301可在终端热点开启荷电状态修正设备300的内部或外部。在特定实施例中，存储器301是非易失性固态存储器。在特定实施例中，存储器301包括只读存储器(ROM)。在合适的情况下，该ROM可以是掩模编程的ROM、可编程ROM(PROM)、可擦除PROM(EPROM)、电可擦除PROM(EEPROM)、电可改写ROM(EAROM)或闪存或者两个或更多个以上这些的组合。
处理器302通过读取存储器301中存储的可执行程序代码来运行与可执行程序代码对应的程序，以用于实现上述实施例中荷电状态修正方法。
在一个示例中，荷电状态修正设备300还可包括通信接口303和总线304。其中，如图7所示，存储器301、处理器302、通信接口303通过总线304连接并完成相互间的通信。
通信接口303，主要用于实现本申请实施例中各模块、装置、单元和/或设备之间的通信。也可通过通信接口303接入输入设备和/或输出设备。
总线304包括硬件、软件或两者，将荷电状态修正设备300的部件彼此耦接在一起。举例来说而非限制，总线304可包括加速图形端口(AGP)或其他图形总线、增强工业标准架构(EISA)总线、前端总线(FSB)、超传输(HT)互连、工业标准架构(ISA)总线、无限带宽互连、低引脚数(LPC)总线、存储器总线、微信道架构(MCA)总线、外围组件互连(PCI)总线、PCI-Express(PCI-X)总线、串行高级技术附件(SATA)总线、视频电子标准协会 局部(VLB)总线或其他合适的总线或者两个或更多个以上这些的组合。在合适的情况下，总线304可包括一个或多个总线。尽管本申请实施例描述和示出了特定的总线，但本申请考虑任何合适的总线或互连。
本申请一实施例还提供一种存储介质，该存储介质上存储有程序，该程序被处理器执行时可实现上述实施例中的荷电状态修正方法。
需要明确的是，本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同或相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。对于装置实施例、设备实施例和存储介质实施例而言，相关之处可以参见方法实施例的说明部分。本申请并不局限于上文所描述并在图中示出的特定步骤和结构。本领域的技术人员可以在领会本申请的精神之后，作出各种改变、修改和添加，或者改变步骤之间的顺序。并且，为了简明起见，这里省略对已知方法技术的详细描述。
本领域技术人员应能理解，上述实施例均是示例性而非限制性的。在不同实施例中出现的不同技术特征可以进行组合，以取得有益效果。本领域技术人员在研究附图、说明书及权利要求书的基础上，应能理解并实现所揭示的实施例的其他变化的实施例。在权利要求书中，术语“包括”并不排除其他装置或步骤；不定冠词“一个”不排除多个；术语“第一”、“第二”用于标示名称而非用于表示任何特定的顺序。权利要求中的任何附图标记均不应被理解为对保护范围的限制。权利要求中出现的多个部分的功能可以由一个单独的硬件或软件模块来实现。某些技术特征出现在不同的从属权利要求中并不意味着不能将这些技术特征进行组合以取得有益效果。

Claims (11)

  1. 一种荷电状态修正方法，包括：
    确定单体电芯的工作状态，所述工作状态包括放电状态或充电状态；
    根据获取的所述单体电芯的当前开路电压、获取的所述单体电芯的当前累计容量、与所述单体电芯的工作状态对应的累计容量对应关系，以及极限起始荷电状态对应的开路电压曲线，确定所述单体电芯修正的荷电状态，所述累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。
  2. 根据权利要求1所述的荷电状态修正方法，其中，所述工作状态包括放电状态，所述累计容量阈值包括最小要求累计放电容量和最大容许累计充电容量；
    所述荷电状态修正方法还包括：
    获取不同放电条件下的不同起始荷电状态的放电开路电压曲线；
    若第一开路电压在所述放电开路电压曲线中对应的荷电状态，与所述第一开路电压在起始荷电状态为100％的放电开路电压曲线中对应的荷电状态之间的误差在预设误差精度范围内，则获取所述放电开路电压曲线所对应的累计充电容量和累计放电容量；
    将值最小的所述累计放电容量作为所述最小要求累计放电容量，将值最大的所述累计充电容量作为所述最大容许累计充电容量。
  3. 根据权利要求1所述的荷电状态修正方法，其中，所述工作状态包括充电状态，所述容量增量阈值包括最大容许累计放电容量和最小要求累计充电容量；
    所述荷电状态修正方法还包括：
    获取不同充电条件下的不同起始荷电状态的充电开路电压曲线；
    若第二开路电压在所述充电开路电压曲线中对应的荷电状态，与所述第二开路电压在起始荷电状态为0％的充电开路电压曲线中对应的荷电状态之间的误差在预设误差精度范围内，则获取所述充电开路电压曲线所对应的累计充电容量和累计放电容量；
    将值最大的所述累计放电容量作为所述最大容许累计放电容量，将值最小的所述累计充电容量作为所述最小要求累计充电容量。
  4. 根据权利要求1所述的荷电状态修正方法，其中，所述工作状态包括放电状态，所述累计容量阈值包括最小要求累计放电容量和最大容许累计充电容量，所述当前累计容量包括当前累计充电容量和当前累计放电容量，所述极限起始荷电状态包括100％；
    所述根据获取的所述单体电芯的当前开路电压、获取的所述单体电芯的当前累计容量、与所述单体电芯的工作状态对应的累计容量对应关系和极限起始荷电状态对应的开路电压曲线，确定所述单体电芯修正的荷电状态，包括：
    根据与所述单体电芯的放电状态对应的累计容量对应关系，得到与所述当前开路电压对应的所述最小要求累计放电容量和所述最大容许累计充电容量；
    若获取的所述当前累计充电容量小于与所述当前开路电压对应的所述最大容许累计充电容量，且获取的所述当前累计放电容量大于与所述当前开路电压对应的最小要求累计放电容量，则将起始荷电状态为100％的放电开路电压曲线中与所述当前开路电压对应的荷电状态作为所述单体电芯修正的荷电状态。
  5. 根据权利要求1所述的荷电状态修正方法，其中，所述工作状态包括放电状态，所述累计容量阈值包括最小要求累计放电容量和最大容许累计充电容量，所述当前累计容量包括当前累计充电容量和当前累计放电容量，所述极限起始荷电状态包括100％和0％；
    所述根据获取的所述单体电芯的当前开路电压、获取的所述单体电芯的当前累计容量、与所述单体电芯的工作状态对应的累计容量对应关系和极限起始荷电状态对应的开路电压曲线，确定所述单体电芯修正的荷电状态，包括：
    根据与所述单体电芯的放电状态对应的累计容量对应关系，得到与所述当前开路电压对应的所述最小要求累计放电容量和所述最大容许累计充电容量；
    若获取的所述当前累计充电容量大于等于与所述当前开路电压对应的所述最大容许累计充电容量，或获取的所述当前累计放电容量小于等于与所述当前开路电压对应的最小要求累计放电容量，则对比计算得到的所述单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态和起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态；
    若计算得到的所述单体电芯的荷电状态，大于所述起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，则将所述起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态作为所述单体电芯修正的荷电状态；
    若计算得到的所述单体电芯的荷电状态，小于所述起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将所述起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态作为所述单体电芯修正的荷电状态；
    若计算得到的所述单体电芯的荷电状态，小于等于所述起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，且大于等于所述起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将计算得到的所述单体电芯的荷电状态作为所述单体电芯修正的荷电状态。
  6. 根据权利要求1所述的荷电状态修正方法，其中，所述工作状态包括充电状态，所述容量增量阈值包括最大容许累计放电容量和最小要求累计充电容量，所述当前累计容量包括当前累计充电容量和当前累计放电容量，所述极限起始荷电状态包括0％；
    所述根据获取的所述单体电芯的当前开路电压、获取的所述单体电芯的当前累计容量、与所述单体电芯的工作状态对应的累计容量对应关系和极限起始荷电状态对应的开路电压曲线，确定所述单体电芯修正的荷电状态，包括：
    根据与所述单体电芯的充电状态对应的累计容量对应关系，得到与所述当前开路电压对应的所述最大容许累计放电容量和所述最小要求累计充 电容量；
    若获取的所述当前累计放电容量小于与所述当前开路电压对应的所述最大容许累计放电容量，且获取的所述当前累计充电容量大于与所述当前开路电压对应的最小要求累计充电容量，则将起始荷电状态为0％的充电开路电压曲线中与所述当前开路电压对应的荷电状态作为所述单体电芯修正的荷电状态。
  7. 根据权利要求1所述的荷电状态修正方法，其中，所述工作状态包括充电状态，所述容量增量阈值包括最大容许累计放电容量和最小要求累计充电容量，所述当前累计容量包括当前累计充电容量和当前累计放电容量，所述极限起始荷电状态包括100％和0％；
    所述根据获取的所述单体电芯的当前开路电压、获取的所述单体电芯的当前累计容量、与所述单体电芯的工作状态对应的累计容量对应关系和极限起始荷电状态对应的开路电压曲线，确定所述单体电芯修正的荷电状态，包括：
    根据与所述单体电芯的放电状态对应的累计容量对应关系，得到与所述当前开路电压对应的所述最大容许累计放电容量和所述最小要求累计充电容量；
    若获取的所述当前累计放电容量大于等于与所述当前开路电压对应的所述最大容许累计放电容量，或获取的所述当前累计充电容量小于等于与所述当前开路电压对应的最小要求累计充电容量，则对比计算得到的所述单体电芯的荷电状态、起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态和起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态；
    若计算得到的所述单体电芯的荷电状态，大于所述起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，则将所述起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态作为所述单体电芯修正的荷电状态；
    若计算得到的所述单体电芯的荷电状态，小于所述起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将所述起始荷 电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态作为确定单体电芯修正的荷电状态；
    若计算得到的所述单体电芯的荷电状态，小于等于所述起始荷电状态为100％的放电开路电压曲线中最大开路电压对应的荷电状态，且大于等于所述起始荷电状态为0％的充电开路电压曲线中最小开路电压对应的荷电状态，则将计算得到的所述单体电芯的荷电状态作为所述单体电芯修正的荷电状态。
  8. 根据权利要求1所述的荷电状态修正方法，其中，所述当前累计容量包括当前累计充电容量和当前累计放电容量；
    所述确定单体电芯的工作状态，包括：
    获取所述单体电芯的当前累计充电容量和当前累计放电容量；
    若所述单体电芯的当前累计充电容量小于所述单体电芯的当前累计放电容量，则确定所述单体电芯的工作状态包括放电状态；
    若所述单体电芯的当前累计充电容量大于所述单体电芯的当前累计放电容量，则确定所述单体电芯的工作状态包括充电状态。
  9. 根据权利要求1所述的荷电状态修正方法，其中，所述确定单体电芯的工作状态，包括：
    获取所述单体电芯的当前温度，在预先测量得到的温度与最小静置时间的对应关系中得到与所述当前温度对应的最小静置时长；
    获取截止到当前时刻的所述单体电芯的静置时长，若所述单体电芯的静置时长大于与所述当前温度对应的最小静置时长，则确定所述单体电芯的工作状态。
  10. 根据权利要求1所述的荷电状态修正方法，其中，所述当前累计容量为截止到当前时刻的时间段内的累计容量，截止到所述当前时刻的时间段不包括静置时间；
    所述累计容量阈值在预设时间段内统计得到，所述预设时间段不包括所述静置时间。
  11. 一种荷电状态修正装置，包括：
    状态确定模块，用于确定单体电芯的工作状态，所述工作状态包括放 电状态或充电状态；
    修正模块，用于根据获取的所述单体电芯的当前开路电压、获取的所述单体电芯的当前累计容量、与所述单体电芯的工作状态对应的累计容量对应关系，以及极限起始荷电状态对应的开路电压曲线，确定所述单体电芯修正的荷电状态，所述累计容量对应关系包括预先测量的开路电压与累计容量阈值的对应关系。
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