WO2020259007A1 - Procédé, dispositif et système pour estimer l'énergie disponible restante d'une batterie, et support d'informations - Google Patents

Procédé, dispositif et système pour estimer l'énergie disponible restante d'une batterie, et support d'informations Download PDF

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WO2020259007A1
WO2020259007A1 PCT/CN2020/084707 CN2020084707W WO2020259007A1 WO 2020259007 A1 WO2020259007 A1 WO 2020259007A1 CN 2020084707 W CN2020084707 W CN 2020084707W WO 2020259007 A1 WO2020259007 A1 WO 2020259007A1
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state
charge
battery
value
interval
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PCT/CN2020/084707
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English (en)
Chinese (zh)
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汤慎之
杜明树
李世超
阮见
卢艳华
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宁德时代新能源科技股份有限公司
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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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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  • This application relates to the field of battery technology, in particular to a method, device, system and storage medium for estimating the remaining available energy of a battery.
  • the remaining available energy (State OF Energy, SOE) of the battery is used to reflect the remaining available energy state of the battery. Since the remaining available energy state of the battery has a strong correlation with the cruising range of an electric vehicle, accurate estimation of the remaining available energy can improve the accuracy of the cruising range estimation, provide the driver with an accurate itinerary reference, and effectively prevent the vehicle from being caused by insufficient power. anchor.
  • the embodiments of the present application provide a method, device, system and storage medium for estimating the remaining available energy of a battery, which can accurately estimate the remaining available energy of a battery with hysteresis characteristics.
  • an embodiment of the present application provides a method for estimating the remaining available energy of a battery, including:
  • an embodiment of the present application provides a device for estimating remaining available energy of a battery, including:
  • the battery parameter determination module is used to determine the current state of charge value of the battery and the current battery temperature; the hysteresis coefficient determination module is used to obtain the accumulation of charging parameters before the battery reaches the specified state of charge value from the operating data of the battery According to the ratio of the cumulative value of the charging parameter and the cumulative value of the discharge parameter, determine the hysteresis coefficient corresponding to the specified state of charge value; the corresponding module is used to determine the remaining battery based on the operating data Correspondence between available energy and state of charge, battery temperature, and hysteresis coefficient; the first energy estimation module is used to use the corresponding relationship to estimate the remaining available energy of the battery based on the current state of charge value, current battery temperature and hysteresis coefficient .
  • an embodiment of the present application provides a battery remaining usable energy estimation system, including: a memory and a processor; the memory is used to store a program; the processor is used to read the executable program code stored in the memory to execute the foregoing The first aspect of the method for estimating the remaining available energy of the battery.
  • an embodiment of the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium.
  • the instructions run on a computer, the computer executes the estimation of the remaining available energy of the battery in the first aspect. method.
  • an embodiment of the present application provides a method for estimating the remaining available energy of a battery, including:
  • an embodiment of the present application provides a device for estimating remaining available energy of a battery, including:
  • the battery parameter determination module is used to determine the current state of charge value of the battery and the current battery temperature;
  • the working condition data acquisition module is used to obtain the working condition operating data of the battery;
  • the second energy estimation module is used to use the preset open circuit voltage Estimation model and voltage estimation model, processing the current state of charge value, current battery temperature and operating conditions of the operating data, to obtain the estimated value of the remaining available energy of the battery.
  • an embodiment of the present application provides a battery remaining usable energy estimation system, including: a memory and a processor; the memory is used to store a program; the processor is used to read the executable program code stored in the memory to execute the foregoing.
  • an embodiment of the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium.
  • the instructions When the instructions are run on a computer, the computer executes the estimation of the remaining available energy of the battery in the fifth aspect. method.
  • the state of charge and battery temperature of the battery can be used in combination with the operating data of the battery. Estimate the remaining available energy of the battery.
  • the hysteresis coefficient of the power battery is obtained by processing the operating data of the battery, and according to the corresponding relationship between the remaining available energy of the battery and the state of charge, battery temperature, and the hysteresis coefficient, the remaining available energy of the battery is estimated, and the estimation is improved. The accuracy of the remaining usable energy of the battery back to the characteristics.
  • the method, device, system and storage medium for estimating the remaining available energy of the battery provided in the embodiments of the present application can also use the preset open-circuit voltage estimation model and the voltage estimation model to process the current state of charge value, current battery temperature and operating conditions Operating data, estimate the remaining available energy of the battery, as the entire estimation process considers the remaining available energy estimation is affected by the operating conditions of the operating data, so as to obtain the remaining available energy value more in line with the actual operating conditions of the battery, and improve the accuracy of the remaining available energy estimation .
  • Figure 1 shows a schematic diagram of the OCV hysteresis characteristic curve of the battery
  • FIG. 2 shows a schematic flowchart of a method for estimating remaining available energy of a battery according to an embodiment of the present application
  • FIG. 3 shows a schematic flowchart of a method for estimating remaining available energy of a battery according to another embodiment of the present application
  • FIG. 4 shows a schematic structural diagram of a device for estimating remaining available energy of a battery according to an embodiment of the present application
  • FIG. 5 shows a schematic structural diagram of a device for estimating remaining available energy of a battery according to another embodiment of the present application
  • Fig. 6 is a structural diagram showing an exemplary hardware architecture of a computing device capable of implementing the method and apparatus for estimating the remaining available energy of a battery according to an embodiment of the present application.
  • the battery in the embodiment of the present application is used to store power, and both the positive electrode and the negative electrode of the battery can escape and receive energy-carrying particles.
  • the battery in the embodiment of the present application may include a power battery and an energy storage battery.
  • the power battery may be applied to the fields of electric vehicles, electric bicycles and other electric tools, for example, and the energy storage battery may be applied to energy storage power stations, Renewable energy grid-connected and micro-grid fields.
  • the battery can be, but not limited to, a lithium iron phosphate system battery or a silicon-added battery system.
  • the lithium iron phosphate system battery is a lithium ion battery with a positive electrode active material containing lithium iron phosphate.
  • the silicon system battery is a lithium ion battery in which the negative electrode active material contains silicon.
  • the battery can be a single battery cell, a battery module or a battery pack, which is not specifically limited in the embodiments of the present application.
  • the hysteresis characteristic refers to the open circuit voltage and discharge voltage corresponding to the same state of charge after the battery is charged and discharged with the same current.
  • the phenomenon of different open circuit voltages. This phenomenon is called the hysteresis characteristic of the battery. Therefore, the hysteresis characteristic can describe the characteristics of the battery's OCV curve affected by historical operating conditions.
  • Figure 1 shows a schematic diagram of the OCV hysteresis characteristic curve of the battery.
  • the OCV curve can be used to describe the correspondence between the OCV and SOC of the battery.
  • the OCV curve of the battery may include a charge OCV curve and a discharge OCV curve.
  • the charging OCV curve can be used to describe the corresponding relationship between the OCV and SOC of the battery in the charged state
  • the discharging OCV curve can be used to describe the corresponding relationship between the OCV and SOC of the battery in the discharged state.
  • the OCV interval of the battery is divided into a hysteretic OCV interval and a non-hysteresis OCV interval.
  • the charge OCV curve and the discharge OCV curve do not overlap, while in the non-hysteresis OCV interval, the charge OCV curve and the discharge OCV curve overlap.
  • the open circuit voltage value in the hysteresis OCV interval can satisfy: When the state of charge value of the battery in the state of charge and the state of charge value in the discharge state are equal, the state of charge value in the state of charge corresponds to The open circuit voltage value of is different from the open circuit voltage value corresponding to the state of charge value in the discharge state.
  • the state of charge interval of the battery can be divided into a hysteretic state of charge interval and a non-hysteresis state of charge interval.
  • the state of charge value in the hysteresis state of charge interval satisfies: when the state of charge value of the battery after charging and the state of charge value of discharge are equal, the open circuit voltage of the battery after charging and the open circuit voltage of the battery after discharge are different.
  • the state of charge value in the non-hysteresis state of charge interval satisfies: when the state of charge value of the battery after charging and the state of charge value of discharge are equal, the open circuit voltage of the battery after charging is equal to the open circuit voltage of the battery after discharge.
  • Fig. 2 is a schematic flow chart showing a method for estimating the remaining available energy of a battery according to an embodiment of the present application. As shown in Figure 2, the method for estimating the remaining available energy of the battery in the embodiment of the present application may include the following steps:
  • Step S210 Determine the current state of charge value of the battery and the current battery temperature.
  • Step S220 from the operating data of the battery, obtain the cumulative value of the charging parameter and the cumulative value of the discharge parameter before the battery reaches the specified state of charge value, and determine the charge and the specified charge according to the ratio of the cumulative value of the charging parameter and the cumulative value of the discharge parameter.
  • Step S230 Determine the correspondence between the remaining available energy of the battery, the state of charge, the battery temperature, and the hysteresis coefficient based on the operating data.
  • step S240 the remaining available energy of the battery is estimated based on the current state of charge value, the current battery temperature and the hysteresis coefficient by using the corresponding relationship.
  • the remaining available energy of the battery can be estimated based on the state of charge and the battery temperature of the battery and the operating data of the battery. In the process, it is considered that the remaining available energy estimation is affected by the working conditions, and the accuracy of remaining available energy estimation is improved.
  • the cumulative value of the charging parameter and the cumulative value of the discharge parameter include: the cumulative charging capacity and the cumulative discharging capacity in the preset cumulative throughput.
  • the cumulative value of the charging parameter and the cumulative value of the discharge parameter include: when the current direction changes for a specified number of times, the changed current direction is the cumulative value of the state of charge change during charging and the changed current direction. The current direction is the cumulative value of the state of charge change during discharge.
  • the cumulative capacity throughput of the preset capacity value before reaching the state of charge value in the operating condition data is obtained; according to the ratio of the cumulative charge capacity and the cumulative discharge capacity in the cumulative capacity throughput, the battery capacity is determined Hysteresis coefficient.
  • the battery has a remaining available energy upper limit and remaining available energy lower limit, and the hysteresis coefficient corresponding to the available energy upper limit is different from the hysteresis coefficient corresponding to the remaining available energy lower limit .
  • the state of charge of the battery is adjusted to a specified state of charge value such as SOC1 through discharge, and then the battery is discharged under a fixed operating condition until the preset discharge cut-off condition is met, and the battery is in the specified state.
  • the lower limit of the remaining available energy at the state of charge value can be denoted as E1, for example.
  • the upper limit value of the remaining available energy can be denoted as E2, for example.
  • the corresponding hysteresis coefficient of the battery is -1, and the hysteresis coefficient corresponding to the upper limit of the remaining available energy of the battery is 1. That is, in the embodiment of the present application, the value range of the hysteresis coefficient of the battery is [-1, 1].
  • the discharge cut-off condition includes that the battery voltage reaches a preset discharge cut-off voltage during the discharging process.
  • the termination voltage refers to the lowest working voltage value when the battery discharges, the voltage drops to the battery no longer suitable for discharging.
  • the hysteresis coefficient of the battery can be calculated according to the ratio of the cumulative charge capacity and the cumulative discharge capacity of the battery in a fixed cumulative throughput within a specified time period in the operating data.
  • the battery temperature, battery SOC and the calculated hysteresis coefficient are used to determine the remaining available energy of the battery.
  • the corresponding relationship between the remaining available energy and the battery state of charge, battery temperature, and hysteresis coefficient may be a corresponding relationship determined through a preset remaining available energy look-up table.
  • step S230 the step of determining the corresponding relationship between the remaining available energy of the battery and the state of charge, battery temperature, and hysteresis coefficient based on the operating condition data may specifically include:
  • Step S11 Obtain multiple battery temperature values and multiple state of charge values of the battery from the operating data, and obtain each state of charge from the multiple state of charge values from the corresponding hysteresis coefficient Hysteresis coefficient corresponding to the value.
  • Step S12 Determine the remaining available energy corresponding to each battery temperature value and each state of charge value of the multiple battery temperature values under different hysteresis coefficients through the battery test.
  • Step S13 according to the remaining available energy corresponding to each battery temperature value and each state of charge value under different hysteresis coefficients, construct a remaining available energy lookup table, and determine the remaining available energy of the battery through the remaining available energy lookup table Correspondence with battery temperature, state of charge, and hysteresis coefficient.
  • the battery system can be tested and calculated to determine the specific remaining available energy values of multiple battery temperature values and multiple battery SOCs in different hysteresis coefficients in the operating data
  • the remaining available energy look-up table indicating the correspondence between the remaining available energy of the battery and the battery SOC, battery temperature and hysteresis coefficient.
  • the correspondence between the remaining available energy and the battery state of charge, battery temperature, and hysteresis coefficient may include: the remaining available energy determined by the remaining available energy calculation expression and the battery state of charge, battery temperature, and hysteresis Correspondence between coefficients.
  • step S230 the step of determining the correspondence between the remaining available energy of the battery, the state of charge, the battery temperature, and the hysteresis coefficient based on the operating data of the working condition may specifically include:
  • Step S21 Obtain a state-of-charge interval according to the state-of-charge value of the battery in the real-time discharge progress, and obtain the battery temperature when the battery reaches the initial state-of-charge value of the state-of-charge interval from the operating data The parameter value of the capacity parameter and the historical value of the capacity parameter.
  • the capacity parameter is a battery state-of-charge parameter
  • the parameter value of the capacity parameter is the initial state-of-charge value of the specified state-of-charge interval
  • the historical value of the capacity parameter includes: the pre-recorded battery reaches the specified state of charge. The state of charge value corresponding to the specified number of current changes before the initial state of charge value of the state interval.
  • the capacity parameter is a battery capacity parameter
  • the parameter value of the capacity parameter is the battery capacity value when the battery reaches the initial state of charge value of the specified state of charge interval
  • the historical value of the capacity parameter includes: a pre-recorded battery The battery capacity value when the current direction changes for a specified number of times before reaching the initial state of charge value of the specified state of charge interval.
  • Step S22 based on the preset open circuit voltage estimation model component and the preset battery voltage estimation model component, process the parameter value of the capacity parameter, the historical value of the capacity parameter and the battery temperature to obtain the dischargeable energy and charge corresponding to the state of charge interval.
  • step S22 may include:
  • S22-02 Use the preset battery voltage estimation model component to process the corresponding open circuit voltage estimation value, battery temperature, and discharge current value corresponding to the state of charge interval to obtain the battery voltage value and state of charge corresponding to the state of charge interval The battery temperature rise corresponding to the interval and the discharge time corresponding to the state of charge interval.
  • Step S23 Based on the battery temperature rise corresponding to the state of charge interval and the battery voltage value corresponding to the state of charge interval, it is determined that the state of charge interval does not reach the preset discharge over-limit condition, according to the battery's real-time discharge progress State of charge value, obtain a new state of charge interval, until the new state of charge interval reaches the discharge over-limit condition, obtain the dischargeable energy corresponding to each state of charge interval before the new state of charge interval, and the battery reaches The battery temperature at the initial state of charge value of each previous state of charge interval.
  • the preset discharge overrun conditions include: the battery temperature when the battery reaches the initial state of charge value of any state of charge interval, and the temperature formed by the battery temperature rise corresponding to any state of charge interval The sum is greater than or equal to the preset temperature threshold; or, when the corresponding battery voltage value of any state of charge interval is lower than the preset lower voltage threshold, it is determined that any state of charge interval reaches the preset discharge over-limit condition.
  • Step S24 the sum of the dischargeable energy corresponding to each previous state of charge interval is used as the remaining available energy value of the battery, based on the remaining available energy value of the battery and the initial state of charge of each previous state of charge interval Value, the battery temperature when the battery reaches the initial state of charge value of each previous state of charge interval, and the initial state of charge value of each previous state of charge interval obtained from the corresponding hysteresis coefficient
  • the corresponding hysteresis coefficient determines the correspondence between the remaining available energy value of the battery and the state of charge value of the battery, the battery temperature and the hysteresis coefficient.
  • the remaining available energy calculation expression under real-time operating conditions can be obtained through the following steps:
  • step S01 starting from the specified state of charge, in the actual operating conditions of the battery, the accumulated value of the charging parameter and the accumulated value of the discharging parameter of the battery are recorded, and the battery temperature is recorded.
  • Step S02 Obtain a state of charge interval according to the real-time discharge progress of the battery, and determine the battery temperature when the battery reaches the initial state of charge value of the state of charge interval.
  • the state of charge of the battery recorded last time to the state of charge recorded this time can be used as a state of charge interval.
  • Step S03 For the state of charge interval, calculate the charge accumulation parameter and discharge accumulation parameter before reaching the initial state of charge value of the charge state interval pre-recorded in the operating data of the state of charge.
  • the hysteresis coefficient corresponding to the initial value of the state of charge of the interval.
  • Step S04 processing the initial state of charge and the historical value of the state of charge of the state of charge interval through the preset open circuit voltage estimation model component to obtain the estimated value of the open circuit voltage corresponding to the initial state of charge.
  • Step S05 Use the battery voltage estimation model component to process the open circuit voltage estimate, battery temperature, and the discharge current value corresponding to the current state of charge interval to obtain the corresponding battery voltage value of the state of charge interval and the corresponding state of charge interval The battery temperature rise and the discharge time corresponding to the state of charge interval.
  • Step S06 Estimate the new battery temperature according to the battery temperature and the battery temperature rise; if the new battery temperature does not exceed the preset temperature threshold, or the battery voltage value corresponding to the state of charge does not exceed the preset voltage threshold, Then, the dischargeable energy corresponding to the state of charge interval can be calculated by the battery voltage value of the state of charge interval, the discharge current corresponding to the state of charge interval, and the discharge duration corresponding to the state of charge interval.
  • step S07 the obtained sum of dischargeable energy corresponding to each state of charge interval is used as the remaining available energy value of the battery, and according to the remaining available energy value and the initial state of charge value corresponding to any state of charge interval,
  • the calculation relationship expression between battery temperature and hysteresis coefficient, the calculation relationship expression is used as the remaining available energy calculation expression of the battery.
  • the battery's state of charge and battery temperature can be monitored in real time, and the open circuit voltage of the battery can be calculated in real time according to the current state of charge and historical state of charge, so as to be based on the open circuit calculated in real time.
  • the voltage estimates the remaining available energy of the battery in real time; the hysteresis coefficient in the actual operating conditions of the battery is determined according to the ratio of the charge accumulation parameter and the discharge accumulation parameter counted in the actual operating conditions.
  • the corresponding relationship between the remaining available energy of the battery and the battery SOC, battery temperature and hysteresis coefficient is fitted to obtain the functional relationship expression used to calculate the remaining available energy in the actual working conditions.
  • the state of charge and the current battery temperature may be connected to determine the remaining available energy of the battery.
  • the battery system is tested and calculated to determine the specific remaining available energy values at different battery temperatures and different SOCs, and a remaining energy look-up table is constructed to indicate the correspondence between the remaining available energy of the battery and the battery SOC and battery temperature. According to the current state of charge value of the battery and the current battery temperature, look up the table to determine the remaining available energy of the battery when the state of charge value of the battery is within the non-hysteresis state of charge interval.
  • the process of processing the operating data of the battery to obtain the hysteresis coefficient can be understood as the calibration process of the hysteresis coefficient of the battery; and determining the remaining available energy of the battery and the battery SOC, battery temperature and hysteresis
  • the process of the corresponding relationship between the coefficients is understood as a method of determining the remaining available energy of the battery through a calibration method.
  • the method of estimating the remaining available energy of the battery is quick and simple.
  • the cumulative charge capacity and the cumulative discharge capacity within the fixed cumulative throughput within the specified time period in the operating data are considered to calculate the power hysteresis of the battery coefficient.
  • the whole calibration process considers at least three parameters of battery temperature, battery state of charge and hysteresis coefficient, that is, considering that the remaining available energy estimation is affected by the actual operating conditions of the battery, improving the estimation accuracy of the remaining available energy of the battery with hysteresis characteristics Sex.
  • Fig. 3 shows a schematic flowchart of a method for estimating remaining available energy of a battery according to another embodiment of the present application.
  • the method for estimating the remaining available energy of the battery may include:
  • Step S310 Determine the current state of charge value of the battery and the current battery temperature.
  • Step S320 Obtain the operating data of the battery.
  • Step S330 Use the preset open circuit voltage estimation model and the preset voltage estimation model to process the current state of charge value, the current battery temperature and the operating data of the working condition to obtain the estimated value of the remaining available energy of the battery.
  • step S330 may specifically include:
  • Step S331 Obtain the state-of-charge value corresponding to the change in the current direction of the specified number of times before the battery reaches the current state-of-charge value in the operating data of the operating condition, as the historical state-of-charge value.
  • the pre-recorded state of charge value when the current direction changes K times (K greater than or equal to 1) from the current state of charge is obtained.
  • the state of charge value when the current direction changes for the last K times is used as the historical state of charge value to obtain K historical states of charge. For example, it can be written as [SOC1, SOC2,..., SOCK].
  • Step S332 dividing the state of charge interval formed by the current state of charge value and the lower limit value of the state of charge into N state of charge subintervals, the lower limit of the state of charge is the state of charge when the battery reaches the discharge cut-off condition Value, where N is an integer greater than 1.
  • the state of charge interval formed by the current state of charge value and the lower limit value of the state of charge when the battery reaches the discharge cut-off condition can be divided into N state of charge sub-intervals, and each state of charge The sub-interval is used as a state-of-charge sub-interval for calculating dischargeable energy, and N state-of-charge sub-intervals can be obtained.
  • the difference in the state of charge formed by the upper limit of the state of charge and the lower limit of the state of charge is recorded as detlaSOC.
  • the detlaSOC of each state of charge sub-interval can be equal or unequal.
  • the N state-of-charge sub-intervals are considered to be the state-of-charge sub-intervals equally divided by the state of charge.
  • the detlaSOC of each state of charge sub-interval may be marked as a.
  • Step S333 using the preset open circuit voltage estimation model component and battery voltage estimation model component, based on the current state of charge value, current battery temperature, and historical state of charge value, calculate each state of charge in the N state of charge subintervals The dischargeable energy corresponding to the sub-interval.
  • the open circuit voltage estimation model component can be used to characterize the correspondence between the current estimated value of the open circuit voltage of the battery and the current state of charge value and the historical state of charge value.
  • the recorded current state of charge and historical state of charge values can be used as input, and the current open circuit voltage value of the battery can be output through the open circuit voltage estimation model with calibrated parameters.
  • the battery voltage estimation model component is used to characterize battery voltage, battery temperature rise, discharge time, and battery open circuit voltage, battery temperature, discharge current or discharge required power, battery internal resistance and preset thermodynamics Model of correspondence between parameters.
  • the battery open circuit voltage, battery temperature, current required for discharge or power required for discharge, battery internal resistance, and preset thermodynamic parameters are input into the battery voltage estimation model component, and the battery voltage value, battery temperature rise, and Discharge time.
  • step S333 may specifically include:
  • Step S333-01 for the first state-of-charge sub-interval of the N state-of-charge sub-intervals, use the open circuit voltage estimation model component to process the historical state-of-charge value to obtain the initial value of the open circuit voltage of the battery.
  • Step S333-02 Obtain the required discharge current value corresponding to the first state of charge sub-interval, and use the battery voltage estimation model component to process the open circuit voltage value of the battery, the current battery temperature and the discharge required corresponding to the first state of charge sub-interval The current value, the battery voltage value of the first state of charge sub-interval, the battery temperature rise of the first state of charge sub-interval, and the discharge time of the first state of charge sub-interval are obtained.
  • the battery voltage estimation model component is used to characterize battery voltage, battery temperature rise, discharge time, and battery open circuit voltage, battery temperature, discharge current or discharge required power, battery internal resistance and preset thermodynamics Model of correspondence between parameters.
  • Battery voltage estimation The model parameters of the model component can be determined by the battery internal resistance and preset thermodynamic parameters.
  • Step S333-03 According to the battery voltage value of the first state of charge subinterval, the required discharge current value corresponding to the first state of charge subinterval, and the discharge duration of the first state of charge subinterval, calculate the first charge The dischargeable energy of the state sub-interval.
  • step S333-04 the open circuit voltage estimation model component is used to process the current state of charge value and the historical state of charge value to obtain the open circuit voltage end value of the first state of charge sub-interval of the battery.
  • the first state of charge subinterval in the N state of charge subintervals can be marked as: [SOCr, SOCr-a] area; first state of charge
  • the i-th state-of-charge sub-interval outside the sub-interval can be denoted as: [SOCr-(N-1) ⁇ a, SOCr-N ⁇ a].
  • step S333 may specifically include:
  • Step S233-05 for the i-th state-of-charge sub-interval other than the first state-of-charge sub-interval of the N state-of-charge sub-intervals, obtain the current value required for discharge, and combine the i-1th state-of-charge subinterval
  • the end value of the open circuit voltage of the interval is taken as the start value of the open circuit voltage of the i-th state of charge subinterval.
  • Step S333-06 Determine the battery temperature corresponding to the i-th state-of-charge sub-interval according to the battery temperature in the i-1th state-of-charge sub-interval and the battery temperature rise in the i-1-th state-of-charge sub-interval, where , The battery temperature in the first state of charge sub-interval is the current battery temperature.
  • Step S333-07 Use the battery voltage estimation model to process the initial value of the open circuit voltage, the battery temperature, and the current value required for discharge to obtain the battery voltage value of the i-th state-of-charge sub-interval and the battery of the i-th state-of-charge sub-interval The temperature rise and the discharge duration of the i-th state of charge sub-interval.
  • Step S333-08 According to the battery voltage value of the i-th state-of-charge sub-interval, the required discharge current value of the i-th state-of-charge sub-interval, and the discharge duration of the i-th state-of-charge sub-interval, calculate the i-th The dischargeable energy of each state of charge sub-interval.
  • step S333-09 the open circuit voltage estimation model component is used to process the initial state of charge value and the historical state of charge value of the i-th state-of-charge subinterval to obtain the end value of the open-circuit voltage of the i-th state-of-charge subinterval.
  • step S334 the sum of the dischargeable energy corresponding to each state of charge sub-interval is determined as the estimated value of the remaining available energy of the battery.
  • the open-circuit voltage estimation model is used to process the initial state of charge value and the historical charge of each state of charge sub-interval
  • the state value and the obtained open circuit voltage value are all different.
  • the method for estimating the remaining available energy in the embodiment of the present application combines a preset open-circuit voltage estimation model and a voltage estimation model to estimate in real time the open-circuit voltage corresponding to each discharge SOC interval, the battery voltage, and the remaining available energy in the discharge SOC interval , Accumulate the remaining available energy of each state of charge sub-interval to obtain the total remaining available energy of the battery.
  • the remaining available energy estimation method may further include:
  • Step S340 when the i-th state-of-charge sub-interval meets the preset discharge over-limit condition, the i-th state-of-charge sub-interval is used as the interval to be subdivided.
  • the preset discharge over-limit condition includes: when the battery voltage value in the i-th state-of-charge sub-interval is lower than the preset lower voltage threshold, or, the battery temperature in the i-th state-of-charge sub-interval and The sum of the temperatures formed by the battery temperature rise in the i-th state-of-charge sub-interval exceeds the preset temperature threshold.
  • Step S341 Divide the interval to be subdivided to obtain M new state-of-charge sub-intervals, and use the first new state-of-charge sub-interval among the M new state-of-charge sub-intervals as the new i-th state of charge Sub-interval, and record the number of times the interval to be subdivided is divided, where M is an integer greater than 1.
  • Step S342 Use the end value of the open circuit voltage of the i-1th state-of-charge sub-interval as the new start value of the open-circuit voltage of the i-th state-of-charge sub-interval, until the j-th state-of-charge sub-interval meets the discharge limit Condition and the recorded number of divided times reaches the preset number threshold,
  • the dischargeable energy of the interval is zero, where j is greater than or equal to i and less than or equal to N+M-1.
  • the i-th state-of-charge sub-interval when the voltage or temperature exceeds the limit in the i-th state-of-charge sub-interval, the i-th state-of-charge sub-interval can be further divided to obtain M new state-of-charge sub-intervals, And continue to calculate the dischargeable energy of each new state of charge sub-interval. Since the detlaSOC of the new state-of-charge sub-interval is smaller than the detlaSOC of the original i-th state-of-charge sub-interval, the dischargeable energy of the previous i-1 state-of-charge sub-interval and the dischargeable energy of the new state-of-charge subinterval are accumulated Energy, can make the accumulated value of dischargeable energy gradually approach the actual value of dischargeable energy.
  • the embodiment of the present application further subdivides the state of charge sub-intervals in which the voltage exceeds the limit or the temperature exceeds the limit, and continues to accumulate the calculated values of each further subdivided new state of charge sub-interval.
  • the dischargeable energy can make the accumulated dischargeable energy approach the actual value of the remaining dischargeable energy in a smooth manner, thereby improving the accuracy of the estimation of the remaining available energy of the battery.
  • the further division of the state of charge sub-interval can be stopped And, the dischargeable energy of the state-of-charge sub-interval can be added to the dischargeable energy of each previous state-of-charge sub-interval, or the dischargeable energy of the state-of-charge sub-interval can be discarded, and the charge The value of the dischargeable energy of the state subinterval and each subsequent state of charge subinterval is set to zero. Then, the sum of the dischargeable energy corresponding to each state of charge sub-interval is calculated to obtain the estimated value of the remaining available energy of the battery.
  • the remaining available energy estimation method may further include:
  • Step S351 when the battery voltage value of the i-th state-of-charge sub-interval is lower than the preset voltage threshold, compare the battery voltage value of the i-1-th state-of-charge sub-interval with the value of the i-th state-of-charge sub-interval The absolute value of the voltage difference of the battery voltage value is used as the first voltage comparison value.
  • Step S352 The absolute value of the voltage difference between the voltage threshold and the battery voltage value of the i-th state of charge sub-interval is used as the second voltage comparison value.
  • Step S353 Determine the voltage ratio between the second voltage comparison value and the first voltage comparison value, and use the difference between 100% and the voltage ratio as the first energy accumulation ratio.
  • step S354 the product of the dischargeable energy of the i-th state-of-charge sub-interval and the first energy accumulation ratio is used as the dischargeable energy of the i-th state-of-charge sub-interval.
  • Step S355 setting the dischargeable energy of each state of charge subinterval after the i-th state of charge subinterval to zero.
  • the battery voltage value of the i-1th state-of-charge sub-interval is 3.2V
  • the battery voltage value of the i-th state-of-charge subinterval is 2.7V
  • the preset voltage threshold is 2.8V
  • the first The voltage comparison value is
  • 0.5V
  • the second voltage comparison value is
  • 0.1V; therefore, the voltage ratio of the second voltage comparison value to the first voltage comparison value is 20 %
  • the voltage in the i-th state-of-charge sub-interval exceeds the limit by 20%, and the first energy accumulation ratio is 80%, and the calculated dischargeable energy of the i-th state-of-charge sub-interval is taken according to the ratio of 80% Value, as the dischargeable energy of the i-th state of charge sub-interval.
  • the remaining available energy estimation method may further include:
  • Step S361 when the sum of the temperature formed by the battery temperature in the i-th state-of-charge sub-interval and the battery temperature rise in the i-th state-of-charge sub-interval exceeds the preset temperature threshold, determine the temperature difference between the temperature sum and the temperature threshold The absolute value of the value.
  • Step S362 Calculate the temperature ratio between the absolute value of the temperature difference and the temperature rise of the battery, and use the difference between the 100% and the temperature ratio as the second energy accumulation ratio.
  • step S363 the product of the dischargeable energy of the i-th state-of-charge sub-interval and the second energy accumulation ratio is used as the dischargeable energy of the i-th state-of-charge sub-interval.
  • Step S364 setting the dischargeable energy of each state of charge subinterval after the i-th state of charge subinterval to zero.
  • the battery temperature in the i-th state-of-charge sub-interval is, for example, 30°C
  • the battery temperature rise in the i-th state-of-charge sub-interval is 5°C
  • the preset temperature threshold is, for example, 34°C
  • the temperature exceeds the limit by 20%
  • the first energy accumulation ratio is 80%
  • the calculated dischargeable energy in the i-th state-of-charge sub-interval is taken as 80% Value, as the dischargeable energy of the i-th state of charge sub-interval.
  • the voltage value of the battery in the state of charge sub-interval is lower than the preset voltage threshold, it means that the battery is in the state of charge sub-interval.
  • the interval voltage exceeds the limit. If the battery temperature after the temperature rise of the battery in the state of charge subinterval exceeds the preset temperature threshold, it means that the temperature of the battery in the state of charge subinterval exceeds the limit.
  • the first energy accumulation ratio can be calculated according to the specific value of the voltage excess, so as to calculate the i-th charge according to the first energy accumulation ratio.
  • the dischargeable energy of the electric state sub-interval is estimated.
  • the second energy accumulation ratio can be calculated according to the specific value of the temperature exceeding the limit, so that the i-th charge can be calculated according to the second energy accumulation ratio.
  • the dischargeable energy of the electric state sub-interval is estimated.
  • the step of estimating the remaining available energy of the battery may specifically include:
  • Step S401 the open circuit voltage estimation model processes the historical state of charge value, and outputs an open circuit voltage of 3.85V.
  • the current SOC of the battery is 70%
  • the lower limit SOC that reaches the discharge cut-off condition is 5%
  • the current battery temperature is 25DegC; divide the state of charge sub-range between 70% and 5% into 13 equal divisions, that is, 13
  • the discharge current required for each state of charge sub-interval is 50A.
  • Step S402 Calculate the first step (that is, the remaining available energy of the first state of charge sub-interval).
  • the initial value of the input open circuit voltage, battery temperature, and discharge current value of the voltage estimation model are 3.85V, 25DegC, and 50A, respectively.
  • the output is battery voltage 3.6V, battery temperature rise 0.2DegC, and discharge time 0.1h.
  • the open circuit voltage estimation model calculates the open circuit voltage again to get 3.8V based on the historical state of charge and the current state of charge value.
  • Step S403 Calculate the second step (that is, the remaining available energy in the second state of charge sub-interval).
  • the initial value of the input open circuit voltage, battery temperature, and discharge current value of the voltage estimation model are 3.8V, 25.2DegC, and 50A respectively.
  • the output is battery voltage 3.53V and temperature rise 0.3DegC, and the discharge time is 0.1h.
  • the open circuit voltage estimation model calculates the open circuit voltage again to get 3.7V according to the initial state of charge value and the historical state of charge value of the second state of charge sub-interval.
  • Step S404 Calculate each step (that is, the remaining available energy in each state-of-charge sub-interval) in turn, until step 13 (ie, the remaining available energy in the last state-of-charge sub-interval) is calculated, and there is no battery in the above calculation process. The phenomenon that the temperature exceeds the limit or the battery voltage exceeds the limit.
  • Step S405 accumulate the remaining available energy of each step: 18wh+17.65wh+...+Step 13 corresponds to the energy of the step to obtain the total dischargeable energy of the battery.
  • the preset open-circuit voltage estimation model and the voltage estimation model are combined, and the preset open-circuit voltage estimation model can be used in operating data.
  • Process the historical state of charge value of the battery to obtain the estimated value of the open circuit voltage of the battery, and use the voltage estimation model to process the estimated value of the open circuit voltage and the battery temperature, the current required for discharge or the power required for discharge, and the output is the battery Voltage, battery temperature rise and discharge time.
  • the remaining available energy of each state of charge sub-interval is calculated, and the remaining available energy of each state of charge sub-interval is accumulated to obtain the total remaining available energy of the battery.
  • the whole calculation process takes into account the influence of the battery operating data on the remaining available energy corresponding to each state of charge sub-interval, so as to obtain the remaining available energy value that is more in line with the actual operating conditions of the battery and improve the accuracy of the remaining available energy estimation degree.
  • Fig. 4 shows a schematic structural diagram of a device for estimating remaining available energy of a battery according to an embodiment of the present application.
  • the remaining available energy estimation device of the battery includes:
  • the battery parameter determination module 410 is used to determine the current state of charge value of the battery and the current battery temperature.
  • the hysteresis coefficient determination module 420 is used to obtain the cumulative value of the charging parameter and the cumulative value of the discharge parameter from the operating data of the battery before the battery reaches the specified state of charge value, according to the ratio of the cumulative value of the charging parameter to the cumulative value of the discharge parameter , To determine the hysteresis coefficient corresponding to the specified state of charge value.
  • the corresponding relationship corresponding module 430 is configured to determine the corresponding relationship between the remaining available energy of the battery, the state of charge, the battery temperature, and the hysteresis coefficient based on the operating data of the working condition.
  • the first energy estimation module 440 is configured to use the corresponding relationship to estimate the remaining available energy of the battery according to the current state of charge value, the current battery temperature and the hysteresis coefficient.
  • the cumulative value of the charging parameter and the cumulative value of the discharge parameter include: the cumulative charging capacity and the cumulative discharging capacity in the preset cumulative throughput.
  • the cumulative value of the charging parameter and the cumulative value of the discharge parameter include: when the current direction changes for a specified number of times, the changed current direction is the cumulative value of the state of charge change during charging and the changed current The direction is the cumulative value of the state of charge change during discharge.
  • the correspondence relationship corresponding module 430 may include:
  • the state of charge interval acquisition unit is used to obtain a state of charge interval according to the state of charge value of the battery in the real-time discharge progress, and obtain the initial state of charge value of the battery to reach the state of charge interval from the operating data
  • the estimated model component processing unit is used to process the parameter value of the capacity parameter, the historical value of the capacity parameter and the battery temperature based on the preset open-circuit voltage estimation model component and the preset battery voltage estimation model component to obtain the corresponding state of charge interval Dischargeable energy, battery temperature rise corresponding to the state of charge interval, and battery voltage value corresponding to the state of charge interval.
  • the estimation model component processing unit can be specifically used for:
  • the preset open circuit voltage estimation model component is used to process the parameter value of the capacity parameter and the historical value of the capacity parameter in the state of charge interval to obtain the estimated value of the open circuit voltage corresponding to the initial state of charge value of the state of charge interval.
  • the preset battery voltage estimation model component uses the preset battery voltage estimation model component to process the corresponding open circuit voltage estimate, battery temperature, and discharge current value corresponding to the state of charge interval to obtain the battery voltage value corresponding to the state of charge interval and the battery corresponding to the state of charge interval The discharge time corresponding to the temperature rise and the state of charge interval.
  • the dischargeable energy corresponding to the state of charge interval is calculated.
  • the dischargeable energy determining unit is used to determine, based on the battery temperature rise corresponding to the state of charge interval and the battery voltage value corresponding to the state of charge interval, when the state of charge interval does not reach the preset discharge over-limit condition, according to the battery status
  • the state of charge value in the real-time discharge progress is obtained, and a new state of charge interval is obtained until the new state of charge interval reaches the discharge over-limit condition, and the corresponding state of charge interval before the new state of charge interval is obtained.
  • the correspondence relationship corresponding module 430 is specifically used to use the sum of the dischargeable energy corresponding to each previous state of charge interval as the remaining available energy value of the battery, according to the remaining available energy value of the battery and each previous state of charge
  • the initial state of charge value of the interval, the battery temperature when the battery reaches the initial state of charge value of each previous state of charge interval, and each previous state of charge interval obtained from the corresponding hysteresis coefficient
  • the hysteresis coefficient corresponding to the initial state of charge value of the battery determines the correspondence between the remaining available energy value of the battery and the state of charge value of the battery, the battery temperature and the hysteresis coefficient.
  • the sum of the battery temperature when the battery reaches the initial state of charge value of any state of charge interval and the temperature formed by the battery temperature rise corresponding to any state of charge interval is greater than or equal to the preset temperature threshold; Alternatively, when the corresponding battery voltage value of any state of charge interval is lower than the preset lower voltage threshold, it is determined that any state of charge interval reaches the preset discharge over-limit condition.
  • the capacity parameter is a battery state-of-charge parameter
  • the parameter value of the capacity parameter is the initial state-of-charge value of the specified state-of-charge interval
  • the historical value of the capacity parameter includes: the pre-recorded battery reaches the specified state of charge. The state of charge value corresponding to the specified number of current changes before the initial state of charge value of the state interval.
  • the capacity parameter is a battery capacity parameter
  • the parameter value of the capacity parameter is the battery capacity value when the battery reaches the initial state of charge value of the specified state of charge interval
  • the historical value of the capacity parameter includes: a pre-recorded battery The battery capacity value when the current direction changes for a specified number of times before reaching the initial state of charge value of the specified state of charge interval.
  • the correspondence relationship corresponding module 430 may include:
  • the data acquisition unit is used to obtain multiple battery temperature values and multiple state-of-charge values of the battery from the operating data, and obtain each of the multiple state-of-charge values from the corresponding hysteresis coefficient The hysteresis coefficient corresponding to the state of charge value.
  • the available energy determining unit is used to determine the remaining available energy corresponding to each battery temperature value and each state-of-charge value of the plurality of battery temperature values through a battery test.
  • the corresponding relationship corresponding module 430 can also construct the remaining available energy look-up table according to the remaining available energy corresponding to each battery temperature value and each state-of-charge value under different hysteresis coefficients, and determine it through the remaining available energy look-up table The relationship between the remaining available energy of the battery and the battery temperature, state of charge, and hysteresis coefficient.
  • the correspondence between the remaining available energy of the battery and the state of charge, battery temperature, and hysteresis coefficient includes: the remaining available energy of the battery and the state of charge of the battery determined by a preset remaining available energy look-up table, The correspondence between the battery temperature and the hysteresis coefficient; or, the correspondence between the remaining available energy of the battery and the battery state of charge, the battery temperature, and the hysteresis coefficient determined by a preset remaining available energy calculation expression.
  • Fig. 5 shows a schematic structural diagram of a device for estimating remaining available energy of a battery according to another embodiment of the present application.
  • the schematic diagram of the structure of the device for estimating the remaining available energy of the battery may include:
  • the battery parameter determination module 510 is used to determine the current state of charge value of the battery and the current battery temperature.
  • the working condition data obtaining module 520 is used to obtain the working condition operating data of the battery.
  • the second energy estimation module 530 is used to process the current state of charge value, current battery temperature and operating data by using the preset open circuit voltage estimation model and voltage estimation model to obtain an estimated value of the remaining available energy of the battery.
  • the second energy estimation module 530 may specifically include:
  • the historical state-of-charge determination unit is used to determine the state-of-charge value corresponding to the change in the current direction of a specified number of times before the battery reaches the current state-of-charge value in the operating data of the working condition, and is the historical state-of-charge value.
  • the state of charge interval dividing unit is used to divide the state of charge interval formed by the current state of charge value and the lower limit value of the state of charge when the battery reaches the discharge cut-off condition into N state of charge subintervals.
  • the sub-interval energy calculation unit is used to calculate the N state-of-charge sub-intervals based on the current state-of-charge value, current battery temperature, and historical state-of-charge value using preset open-circuit voltage estimation model components and battery voltage estimation model components The dischargeable energy corresponding to each state of charge sub-interval.
  • the dischargeable energy accumulation unit is used to determine the sum of the dischargeable energy corresponding to each state of charge sub-interval, which is the estimated value of the remaining available energy of the battery.
  • the sub-interval energy calculation unit may specifically include:
  • the first model processing subunit is configured to use the open circuit voltage estimation model component for the first state of charge subinterval among the N state of charge subintervals to process historical state of charge values to obtain the initial value of the open circuit voltage of the battery.
  • the second model processing subunit is used to obtain the required discharge current value corresponding to the first state of charge sub-interval, and use the battery voltage estimation model component to process the open circuit voltage value of the battery, the current battery temperature and the corresponding first state of charge sub-interval
  • the required discharge current value of obtains the battery voltage value of the first state of charge sub-interval, the battery temperature rise of the first state of charge sub-interval, and the discharge duration of the first state of charge sub-interval.
  • the sub-interval energy calculation unit can also be specifically used to according to the battery voltage value of the first state-of-charge sub-interval, the required discharge current value corresponding to the first state-of-charge sub-interval, and the discharge duration of the first state-of-charge sub-interval, The dischargeable energy of the first sub-interval of the state of charge is calculated.
  • the first model processing subunit can also be specifically used to use the open circuit voltage estimation model component to process the current state of charge value and historical state of charge value to obtain the open circuit voltage end value of the battery, and use the open circuit voltage end value as the next charge The starting value of the open circuit voltage of the state subinterval.
  • the sub-interval energy calculation unit may specifically include:
  • the first model processing sub-unit can be specifically used to target the i-th state-of-charge sub-interval other than the first state-of-charge sub-interval among the N state-of-charge sub-intervals, and combine the i-1th state-of-charge sub-interval
  • the end value of the open circuit voltage is used as the start value of the open circuit voltage of the i-th state of charge sub-interval, where i is less than or equal to N, and N is an integer greater than 1.
  • the battery temperature calculation unit is used to obtain the required discharge current value corresponding to the i-1th state-of-charge subinterval, based on the battery temperature of the i-1th state-of-charge subinterval and the i-1th state-of-charge subinterval
  • the battery temperature rise in the interval determines the battery temperature corresponding to the i-th state-of-charge sub-interval.
  • the second model processing subunit can be specifically used to use the battery voltage estimation model to process the initial value of the open circuit voltage, the battery temperature, and the current value required for discharge to obtain the battery voltage value of the i-th state-of-charge sub-interval and the i-th charge The battery temperature rise in the electrical state sub-interval and the discharge duration of the i-th state-of-charge sub-interval.
  • the sub-interval energy calculation unit can also be specifically used for discharging according to the battery voltage value of the i-th state-of-charge sub-interval, the discharge current value of the i-th state-of-charge sub-interval and the i-th state-of-charge sub-interval Time length, calculate the dischargeable energy of the i-th charged state sub-interval.
  • the first model processing subunit can also be specifically used to estimate the model component by using the open circuit voltage to process the initial state of charge value and the historical state of charge value of the i-th state-of-charge sub-interval to obtain the i-th state-of-charge sub-interval The end value of the open circuit voltage of the interval.
  • the remaining available energy estimation device may further include:
  • the lower limit value determination unit of the state of charge value is configured to use the i-th state-of-charge sub-interval as the interval to be subdivided when the i-th state-of-charge sub-interval meets the preset interval subdivision condition.
  • the state-of-charge interval dividing unit is also used to divide the interval to be subdivided, to obtain M new state-of-charge sub-intervals, and use the first new state-of-charge sub-interval among the M new state-of-charge sub-intervals as the new The i-th state-of-charge sub-interval of, and record the number of times the interval to be subdivided is divided.
  • the sub-interval energy calculation unit can also be used to set the end value of the open circuit voltage of the i-1th state-of-charge sub-interval as the new start value of the open-circuit voltage of the i-th state-of-charge subinterval, until the j-th state of charge When the status sub-interval meets the interval subdivision condition and the recorded number of divided times reaches the preset number threshold,
  • the dischargeable energy of the interval is zero, where j is greater than or equal to i and less than or equal to N+M-1.
  • the remaining available energy estimation device may further include:
  • the first voltage comparison value calculation unit is configured to compare the battery voltage value of the i-1th state-of-charge sub-interval with the i-th state-of-charge sub-interval when the battery voltage value in the i-th state-of-charge sub-interval is lower than
  • the absolute value of the voltage difference between the battery voltage values of the two state-of-charge sub-intervals is used as the first voltage comparison value.
  • the second voltage comparison value calculation unit is configured to use the absolute value of the voltage difference between the voltage threshold and the battery voltage value of the i-th state of charge sub-interval as the second voltage comparison value.
  • the first accumulation ratio calculation unit is used to determine the voltage ratio between the second voltage comparison value and the first voltage comparison value, and use the difference between 100% and the voltage ratio as the first energy accumulation ratio.
  • the sub-interval energy calculation unit may also be used to take the product of the dischargeable energy of the i-th charged state sub-interval and the first energy accumulation ratio as the dischargeable energy of the i-th charged state sub-interval.
  • the sub-interval energy calculation unit may also be used to set the dischargeable energy of each state-of-charge sub-interval after the i-th state-of-charge sub-interval to zero.
  • the remaining available energy estimation device may further include:
  • the temperature difference calculation unit is used to determine the sum of the temperature when the sum of the battery temperature in the i-th state-of-charge sub-interval and the battery temperature rise in the i-th state-of-charge sub-interval exceeds a preset temperature threshold The absolute value of the temperature difference of the temperature threshold.
  • the second accumulation ratio calculation unit is used to calculate the temperature ratio between the absolute value of the temperature difference and the temperature rise of the battery, and use the difference between the 100% and the temperature ratio as the second energy accumulation ratio.
  • the sub-interval energy calculation unit may also be used to take the product of the dischargeable energy of the i-th charged state sub-interval and the second energy accumulation ratio as the dischargeable energy of the i-th charged state sub-interval.
  • the sub-interval energy calculation unit may also be used to set the dischargeable energy of each state-of-charge sub-interval after the i-th state-of-charge sub-interval to zero.
  • the preset discharge over-limit condition includes: when the battery voltage value in the i-th state-of-charge sub-interval is lower than the preset lower voltage threshold, or, the battery temperature in the i-th state-of-charge sub-interval and The sum of the temperatures formed by the battery temperature rise in the i-th state-of-charge sub-interval exceeds the preset temperature threshold.
  • the open circuit voltage estimation model component is used to characterize the correspondence between the current estimated value of the open circuit voltage of the battery and the current state of charge value and the historical state of charge value; the battery voltage estimation model component is used to characterize the battery A model of the correspondence between voltage, battery temperature rise, discharge time, and battery open circuit voltage, battery temperature, discharge current or discharge power, battery internal resistance, and preset thermodynamic parameters.
  • Fig. 6 is a structural diagram showing an exemplary hardware architecture of a computing device capable of implementing the method and apparatus for estimating the remaining available energy of a battery according to an embodiment of the present application.
  • the computing device 600 includes an input device 601, an input interface 602, a central processing unit 603, a memory 604, an output interface 605, and an output device 606.
  • the input interface 602, the central processing unit 603, the memory 604, and the output interface 605 are connected to each other through the bus 610, and the input device 601 and the output device 606 are connected to the bus 610 through the input interface 602 and the output interface 605, respectively, and then to the computing device 600 The other components are connected.
  • the input device 601 receives input information from the outside, and transmits the input information to the central processing unit 603 through the input interface 602; the central processing unit 603 processes the input information based on the computer executable instructions stored in the memory 604 to generate output Information, the output information is temporarily or permanently stored in the memory 604, and then the output information is transmitted to the output device 606 through the output interface 605; the output device 606 outputs the output information to the outside of the computing device 600 for use by the user.
  • the computing device 600 shown in FIG. 6 may be implemented as a remaining available energy estimation system for a battery, and the remaining available energy estimation system may include: a memory configured to store a program; a processor configured to To run the program stored in the memory to execute the remaining available energy estimation method described in the above embodiment.
  • the process described above with reference to the flowchart can be implemented as a computer software program.
  • the embodiments of the present application include a computer program product, which includes a computer program tangibly contained on a machine-readable medium, and the computer program includes program code for executing the method shown in the flowchart.
  • the computer program may be downloaded and installed from the network, and/or installed from a removable storage medium.
  • the computer program product includes one or more computer instructions, which when run on a computer, cause the computer to execute the methods described in the foregoing various embodiments.
  • the computer can be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • Computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • computer instructions can be transmitted from a website, computer, server, or data center through a cable (such as Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website, computer, server or data center.
  • a computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state hard disk).
  • the device embodiments described above are merely illustrative.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place. , Or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement it without creative work.

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Abstract

La présente invention concerne un procédé, un dispositif et un système pour estimer l'énergie disponible restante d'une batterie, et un support d'informations. Le procédé comprend les étapes suivantes : déterminer la valeur d'état de charge actuelle d'une batterie et la température actuelle de la batterie (S210) ; acquérir des données de fonctionnement dans un état d'utilisation de la batterie, et traiter les données de fonctionnement dans l'état d'utilisation de la batterie afin d'obtenir un coefficient d'hystérésis de la batterie (S220) ; et estimer l'énergie disponible restante de la batterie en fonction de relations correspondantes de l'énergie disponible restante de la batterie à l'aide de l'état de charge, de la température de la batterie et du coefficient d'hystérésis (S230, S240). La précision d'estimation de l'énergie disponible restante de la batterie à l'aide de caractéristiques d'hystérésis peut être améliorée.
PCT/CN2020/084707 2019-06-24 2020-04-14 Procédé, dispositif et système pour estimer l'énergie disponible restante d'une batterie, et support d'informations WO2020259007A1 (fr)

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CN110967638B (zh) * 2019-06-24 2021-03-23 宁德时代新能源科技股份有限公司 电池的剩余可用能量估算方法、装置、系统和存储介质
CN112462270B (zh) * 2020-10-16 2024-04-26 欣旺达动力科技股份有限公司 电池组可用能量检测方法、系统、设备及存储介质
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