CN110568375A - SOH (state of health) determination method and device for power battery - Google Patents

SOH (state of health) determination method and device for power battery Download PDF

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Publication number
CN110568375A
CN110568375A CN201910828811.3A CN201910828811A CN110568375A CN 110568375 A CN110568375 A CN 110568375A CN 201910828811 A CN201910828811 A CN 201910828811A CN 110568375 A CN110568375 A CN 110568375A
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soh
power battery
determining
voltage value
accumulated
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郭峰
赵亮
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Kunshan Bao Innovative Energy Technology Co Ltd
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Kunshan Bao Innovative Energy Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
    • 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]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The application provides a method and a device for determining the state of health (SOH) of a power battery, wherein the method comprises the steps of obtaining the highest single voltage value, the lowest single voltage value, the accumulated charge amount, the accumulated discharge amount, the initial direct current internal resistance value and the current direct current internal resistance value of the power battery; determining a first SOH according to the highest single voltage value and the lowest single voltage value; determining a second SOH according to the accumulated discharge capacity and the accumulated charge capacity; determining a third SOH according to the initial direct current internal resistance value and the current direct current internal resistance value; and determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH. Therefore, the SOH of the battery is accurately estimated by adopting multiple factors of the power battery, the estimation deviation of the SOH of the battery caused by only considering a single factor is avoided, and the estimation precision of the SOH of the power battery is improved.

Description

SOH (state of health) determination method and device for power battery
Technical Field
The application relates to the technical field of power batteries of electric vehicles, in particular to a method and a device for determining the state of health (SOH) of a power battery.
Background
With the increasingly prominent energy problem of economic development, the environmental protection consciousness of people is gradually enhanced, and the development of new energy automobiles, especially electric automobiles, becomes the consensus of people and is the main development direction in the future. Among them, the electric vehicle mainly relies on the power battery to provide energy, and the health status of the power battery is very important for the electric vehicle.
Currently, in the field of electric vehicles, a battery management system in a main electric vehicle manages a state of Health (SOH) of a power battery. In the related art, the battery management system usually determines the battery health status of the power battery based on a single factor (e.g., the accumulated charge and discharge amount of the battery), however, the battery health status of the power battery determined based on the single factor has a large difference from the real health status of the power battery. Therefore, how to accurately estimate the state of health SOH of the battery is an urgent technical problem to be solved.
disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, a first objective of the present application is to propose a power battery state of health SOH determination method.
a second object of the present application is to provide a power battery state of health SOH determination apparatus.
A third object of the present application is to provide an electric vehicle.
a fourth object of the present application is to propose another power battery state of health, SOH, determination apparatus.
A fifth object of the present application is to propose a computer-readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present application provides a method for determining state of health, SOH, of a power battery, including: acquiring a highest single voltage value of a power battery before charging and a lowest single voltage value of the power battery after charging, acquiring a current accumulated charging amount and an accumulated discharging amount of the power battery, and acquiring a current direct current internal resistance value of the power battery and an initial direct current internal resistance value at a service life starting point BOL stage; determining a first SOH according to the highest cell voltage value and the lowest cell voltage value; determining a second SOH of the power battery according to the current accumulated charging amount and the accumulated discharging amount of the power battery; determining a third SOH of the power battery according to the current direct current internal resistance value and the initial direct current internal resistance value; and determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH.
In one embodiment of the present application, the method further comprises: the determining a first SOH according to the highest cell voltage value and the lowest cell voltage value includes: acquiring the current charging capacity of the power battery, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value; determining the real full capacity of the power battery according to the charging capacity, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value; acquiring preset discharge electric quantity of the power battery; and determining the first SOH according to the real full capacity and the preset discharging electric quantity.
In one embodiment of the application, the determining the second SOH of the power battery according to the current accumulated charge amount and accumulated discharge amount of the power battery includes: acquiring a nominal accumulated discharge amount and a nominal accumulated charge amount of the power battery in the whole life cycle; determining the discharging SOH of the power battery according to the nominal accumulated discharging amount and the accumulated discharging amount; determining the discharging SOH of the power battery according to the nominal accumulated charging amount and the accumulated charging amount; and determining the second SOH of the power battery according to the discharging SOH and the charging SOH.
In one embodiment of the present application, said determining said second SOH of said power cell based on said discharging SOH and said charging SOH comprises: determining a smaller value of the discharging SOH and the charging SOH as the second SOH.
In an embodiment of the application, the determining a third SOH of the power battery according to the current dc internal resistance value and the initial dc internal resistance value includes: and determining a third SOH of the power battery according to the ratio of the current direct current internal resistance value to the initial direct current internal resistance value.
according to the method for determining the state of health (SOH) of the power battery, the highest single voltage value, the lowest single voltage value, the accumulated charging amount and the accumulated discharging amount of the power battery are obtained, and the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point are obtained; determining a first SOH according to the highest single voltage value and the lowest single voltage value; determining a second SOH according to the accumulated discharge capacity and the accumulated charge capacity; determining a third SOH according to the initial direct current internal resistance value and the second direct current internal resistance value; and determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH. Therefore, the SOH of the battery can be automatically estimated in real time on line, the test data of the battery core and the current running state of the vehicle are fully combined in the estimation of the SOH, and the estimation effect is better. Meanwhile, the SOH of the battery is estimated more accurately by adopting various factors such as the highest single voltage value, the lowest single voltage value, the accumulated charging amount and the accumulated discharging amount of the power battery, the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point, the estimation deviation of the SOH of the battery caused by only considering a single factor is avoided as much as possible, and the estimation precision of the SOH of the power battery is improved.
To achieve the above object, an embodiment of a second aspect of the present application provides a state of health, SOH, determination apparatus for a power battery, including: the acquisition module is used for acquiring the highest single voltage value of the power battery before charging and the lowest single voltage value of the power battery after charging, acquiring the current accumulated charging amount and the current accumulated discharging amount of the power battery, and acquiring the current direct current internal resistance value of the power battery and the initial direct current internal resistance value at the BOL stage of the service life starting point; the first determining module is used for determining a first SOH according to the highest cell voltage value and the lowest cell voltage value; the second determination module is used for determining a second SOH of the power battery according to the current accumulated charging amount and the accumulated discharging amount of the power battery; the third determining module is used for determining a third SOH of the power battery according to the current direct current internal resistance value and the initial direct current internal resistance value; and the fourth determination module is used for determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH.
In an embodiment of the application, the first determining module is specifically configured to: acquiring the current charging capacity of the power battery, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value; determining the real full capacity of the power battery according to the charging capacity, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value; acquiring preset discharge electric quantity of the power battery; and determining the first SOH according to the real full capacity and the preset discharging electric quantity.
In an embodiment of the application, the second determining module is specifically configured to: acquiring a nominal accumulated discharge amount and a nominal accumulated charge amount of the power battery in the whole life cycle; determining the discharging SOH of the power battery according to the nominal accumulated discharging amount and the accumulated discharging amount; determining the discharging SOH of the power battery according to the nominal accumulated charging amount and the accumulated charging amount; and determining the second SOH of the power battery according to the discharging SOH and the charging SOH.
In an embodiment of the application, the second determining module is specifically configured to: determining a smaller value of the discharging SOH and the charging SOH as the second SOH.
In an embodiment of the application, the third determining module is specifically configured to: and determining a third SOH of the power battery according to the ratio of the current direct current internal resistance value to the initial direct current internal resistance value.
The device for determining the state of health (SOH) of the power battery of the embodiment of the application obtains the highest single voltage value, the lowest single voltage value, the accumulated charge amount and the accumulated discharge amount of the power battery, and the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point; determining a first SOH according to the highest single voltage value and the lowest single voltage value; determining a second SOH according to the accumulated discharge capacity and the accumulated charge capacity; determining a third SOH according to the initial direct current internal resistance value and the second direct current internal resistance value; and determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH. Therefore, the SOH of the battery can be automatically estimated in real time on line, the test data of the battery core and the current running state of the vehicle are fully combined in the estimation of the SOH, and the estimation effect is better. Meanwhile, the SOH of the battery is estimated more accurately by adopting various factors such as the highest single voltage value, the lowest single voltage value, the accumulated charging amount and the accumulated discharging amount of the power battery, the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point, the estimation deviation of the SOH of the battery caused by only considering a single factor is avoided as much as possible, and the estimation precision of the SOH of the power battery is improved.
In order to achieve the above object, an embodiment of the third aspect of the present application provides an electric vehicle, including the power battery state of health SOH determination apparatus as described in any one of the above.
to achieve the above object, an embodiment of a fourth aspect of the present application provides another battery state of health SOH determination apparatus, including: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the power battery state of health SOH determination method as described above when executing the program.
In order to achieve the above object, a fifth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the power battery state of health SOH determination method as described above.
additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow diagram of a power cell state of health (SOH) determination method according to one embodiment of the present application;
FIG. 2 is a schematic flow chart of a refinement of step 102 in the embodiment shown in FIG. 1;
FIG. 3 is a schematic flow chart of a refinement of step 103 in the embodiment shown in FIG. 1;
FIG. 4 is a schematic structural diagram of a power battery state of health SOH determination apparatus according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of another battery state of health SOH determination apparatus according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The method, the device and the electric vehicle for determining the state of health SOH of the power battery according to the embodiments of the present application are described below with reference to the accompanying drawings.
Fig. 1 is a flow chart of a power battery state of health SOH determination method according to an embodiment of the present application. It should be noted that the main executing body of the method for determining the state of health SOH of the power Battery provided in this embodiment is a device for determining the state of health SOH of the power Battery, and the device for determining the state of health SOH of the power Battery may be configured in a Battery Management System (BMS) of an electric vehicle for estimating the state of health SOH of the Battery.
As shown in fig. 1, the method for determining state of health, SOH, of a power battery may include:
Step 101, obtaining the highest single voltage value of the power battery before charging and the lowest single voltage value of the power battery after charging, obtaining the current accumulated charging amount and the current accumulated discharging amount of the power battery, and obtaining the current direct current internal resistance value of the power battery and the initial direct current internal resistance value at the stage of the service life starting point BOL.
Specifically, in order to avoid the estimation deviation of the state of health SOH of the battery caused by only considering a single factor as much as possible, the state of health SOH of the battery is estimated more accurately by using various factors such as the highest cell voltage value, the lowest cell voltage value, the accumulated charge amount, the accumulated discharge amount of the power battery, and the initial dc internal resistance value and the current dc internal resistance value of the power battery at the beginning point of life BOL.
In the embodiment, the battery management system monitors the current accumulated discharge amount and the accumulated charge amount of the power battery, and when the battery health state of the power battery needs to be estimated, the current accumulated discharge amount and the accumulated charge amount of the power battery monitored by the battery management system are obtained.
The accumulated discharge amount refers to the discharge amount accumulated from the beginning of the use of the power battery to the present, and the accumulated discharge amount is recorded asThe unit is ampere hour Ah.
The accumulated charge amount refers to the accumulated charge amount of the power battery from the beginning to the present, and the accumulated charge amount is recorded asthe unit is ampere hour Ah.
In one embodiment of the present application, in order to accurately estimate the state of health SOH of the battery, the accumulated discharge amount and the accumulated charge amount may be corrected according to the environmental temperature, for example, different environmental temperatures correspond to different correction coefficients, the accumulated discharge amount is multiplied by the corresponding correction coefficient to obtain a final accumulated discharge amount, and the accumulated charge amount is multiplied by the corresponding correction coefficient to obtain a final accumulated charge amount. Wherein, the value range of the correction system is (0, 1).
Specifically, the battery management system monitors the direct current internal resistance value of the power battery in real time in the whole life cycle.
Specifically, the whole Life cycle of the power battery starts from BOL (Beginning of Life) to End of EOL (End of Life), and the current direct current internal resistance value of the power battery is the direct current internal resistance corresponding to any time point of the power battery after the BOL stageThe value is obtained. Herein, the first direct current internal resistance value in BOL stage of the power battery is recorded as RBOL-mOhmIn milli-ohms m Ω. Recording the second direct current internal resistance value of the power battery in the current state as RCurrent-mOhmin milli-ohms m Ω.
The battery management system stores the initial direct current internal resistance value of the power battery in the BOL stage, and meanwhile, the battery management system estimates the current direct current internal resistance value of the power battery in real time.
It should be noted that, in different application scenarios, obtaining the current dc internal resistance value of the power battery may be implemented in various ways, for example, as follows:
As a possible implementation manner, when the battery management system detects that the current of the power battery rises or falls instantaneously, the ratio of the voltage of the power battery to the bus current is calculated to obtain the current direct current internal resistance value of the power battery.
As another possible implementation manner, when the current and voltage values are under a specific working condition, the current direct-current internal resistance value of the power battery is determined by a linear regression online estimation method in combination with the current and voltage values.
As another possible implementation manner, when the battery management system detects that the current of the power battery instantly rises or falls, a ratio of the voltage of the power battery to the bus current is calculated to obtain a current first direct current internal resistance value of the power battery, and when the current and the voltage values are under a specific working condition, the current first direct current internal resistance value of the power battery is determined by a linear regression online estimation method in combination with the current and voltage values, and then the current direct current internal resistance value of the power battery is determined according to the current first direct current internal resistance value and the second direct current internal resistance value of the power battery.
specifically, after the current first direct internal resistance value and the current second direct internal resistance value of the power battery are obtained, the current first direct internal resistance value and the current second direct internal resistance value can be corrected and weighted according to conditions of preset voltage, temperature and SOC, so as to obtain the final current direct internal resistance value of the power battery.
It should be noted that the battery management system in this embodiment may not only manage the state of health SOH of the battery, but also have other functions, for example, the battery management system may further have functions of voltage measurement (necessary), communication, battery state of Charge (SOC) estimation, abnormality warning, equalization (passive equalization or active equalization), temperature measurement, current measurement, and diagnosis, and the embodiment is not limited to this specifically.
Step 102, determining a first SOH according to the highest cell voltage value and the lowest cell voltage value.
In different application scenarios, the first SOH is determined in different manners according to the highest cell voltage value and the lowest cell voltage value. Here, let the first SOH be SOHcellVoltage-pctin% by unit.
As a possible implementation manner, a specific implementation manner of step 102, as shown in fig. 2, may include:
Step 1021, acquiring the current charging capacity of the power battery, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value.
In this embodiment, during the process of charging the power battery, the battery management system may perform ampere-hour integral calculation to obtain the current charging capacity of the power battery. Here, the current charge capacity of the power battery is referred to as interagah, and the unit is ampere hour Ah.
in this embodiment, after acquiring the highest cell voltage value of the power battery before charging and the lowest cell voltage value of the power battery after charging, in order to accurately determine the battery state of charge corresponding to the lowest cell voltage value and the highest cell voltage value, the battery state of charge corresponding to the highest cell voltage value may be acquired in combination with the current temperature value and the highest cell voltage value of the power battery, and the battery state of charge corresponding to the lowest cell voltage value may be acquired in combination with the current temperature value and the lowest cell voltage value of the power battery.
As one possible implementation, the battery management system stores a first data table in advance, where the first data table stores a correspondence relationship among a temperature value, an Open Circuit Voltage (OCV) of a cell, and a battery state of charge (SOC).
the battery management system acquires the current temperature value of the power battery, inquires a first data table according to the current temperature value and the highest cell voltage value, acquires the battery charge state corresponding to the highest cell voltage value, and records the battery charge state corresponding to the highest cell voltage value as SOCcellVoltage-H-pct。
The battery management system acquires the current temperature value of the power battery, inquires a first data table according to the current temperature value and the lowest single voltage value, acquires the battery charge state corresponding to the lowest single voltage value, and records the battery charge state corresponding to the lowest single voltage value as SOCcellVoltage-L-pct。
And step 1022, determining the real full capacity of the power battery according to the charging capacity, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value.
In this embodiment, after the charge capacity, the battery state of charge corresponding to the highest cell voltage value, and the battery state of charge corresponding to the lowest cell voltage value are obtained, the charge capacity, the battery state of charge corresponding to the highest cell voltage value, the battery state of charge corresponding to the lowest cell voltage value, and the formula for calculating the true full capacity of the power battery are combined to calculate the true full capacity of the power battery.
Specifically, the true full capacity of the power battery may be determined by equation (1), but is not limited thereto. Wherein, recording the real full capacity as SOCSOH-AhThe unit is ampere hour Ah.
And 1023, acquiring preset discharging electric quantity of the power battery.
As an exemplary embodiment, in order to improve the accuracy of the first SOH estimation of the subsequent power battery, the preset discharge amount of the power battery may be obtained in combination with the current ambient temperature.
The preset discharge capacity is calibrated according to a large amount of experimental data, for example, the vehicle-mounted power battery discharges to the cut-off voltage of the battery cell at room temperature at a 1/3C charge-discharge rate, the discharged capacity is used as the preset discharge capacity, and the preset discharge capacity is recorded as the SOCNormal-AhThe unit is ampere hour Ah.
And step 1024, determining a first SOH according to the real full capacity and the preset discharging electric quantity.
as an example, the first SOH is determined according to equation (2), but is not limited thereto.
And 103, determining a second SOH of the power battery according to the current accumulated charge amount and the accumulated discharge amount of the power battery.
In different application scenarios, the implementation manner of determining the second SOH of the power battery is different according to the current accumulated charge amount and the accumulated discharge amount of the power battery.
As a possible implementation, as shown in fig. 3, step 103 may include:
And step 1031, acquiring a nominal accumulated discharging amount and a nominal accumulated charging amount of the power battery in the whole life cycle.
The nominal accumulated discharge capacity is the electric quantity which can be discharged by the power battery from BOL to EOL in the whole life cycle of the power battery.
The nominal accumulated charge amount may be understood as the amount of electricity that the power battery can charge from BOL to EOL during the whole life of the power battery.
as an exemplary embodiment, in order to improve the accuracy of the second SOH of the power cell subsequently determined in connection with the charge, the current ambient temperature, the nominal accumulated discharge amount and the nominal accumulated charge amount of the power cell over the entire life cycle may be combined.
in the present embodiment, a description is given taking a nominal integrated discharge amount and a nominal integrated charge amount at room temperature as examples.
In this embodiment, theIndicating the nominal cumulative discharge byIndicating the cumulative nominal cumulative discharge.
And step 1032, determining the discharging SOH of the power battery according to the nominal accumulated discharging amount and the accumulated discharging amount.
That is, in the present embodiment, the discharging SOH of the power battery is determined according to the nominal accumulated discharge amount of the power battery and the current accumulated discharge amount of the power battery.
And 1033, determining the discharging SOH of the power battery according to the nominal accumulated charging amount and the accumulated charging amount.
Specifically, the discharging SOH can be understood as the state of health of the battery converted from the unilateral discharging amount of the power battery, and the discharging SOH is recorded as the SOHDischarge-pctIn% by weight.
As an example, the discharge SOH is calculated according to equation (3), but is not limited thereto.
Specifically, the charging SOH can be understood as converting the state of health of the battery according to the unilateral charging quantity of the power battery, and the charging SOH is recorded as the SOHCharge-pctIn% by weight.
As an example, the charging SOH is calculated according to equation (4), but is not limited thereto.
Step 1034, determining a second SOH of the power battery according to the discharging SOH and the charging SOH.
In this embodiment, according to the discharging SOH and the charging SOH, the specific implementation manner of determining the second SOH of the power battery may be: the smaller of the discharged SOH and the charged SOH is determined as a second SOH.
Specifically, the discharging SOH can be understood as the state of health of the battery converted from the unilateral discharging amount of the power battery, and the discharging SOH is recorded as the SOHDischarge-pctIn% by weight.
As an example, the discharge SOH is calculated according to equation (3), but is not limited thereto.
Specifically, the second SOH is determined according to equation (5):
SOHCharge-DisCharge-pct＝Minimum(SOHDischarge-pct，SOHCharge-pct) (5)
Specifically, if the discharging SOH is smaller than the charging SOH, the charging SOH is determined as the second SOH, whereas if the charging SOH is smaller than the discharging SOH, the charging SOH is determined as the second SOH.
And 104, determining a third SOH of the power battery according to the current direct current internal resistance value and the initial direct current internal resistance value.
In this embodiment, according to the current internal direct current resistance value and the initial internal direct current resistance value, the specific implementation manner of determining the third SOH of the power battery may be: and determining a third SOH of the power battery according to the ratio of the current direct current internal resistance value to the initial direct current internal resistance value.
Specifically, the state of health of the battery is estimated according to the direct current resistance value of the power battery, and the third SOH is recorded as the SOHR-pctIn% by weight.
As an example, the third SOH is determined according to equation (6):
Wherein R isCurrent-m0hmRepresents the current direct current internal resistance value, R, of the power batteryBCL-m0hmTo representAnd the initial direct current internal resistance value of the power battery at the service life starting point BOL stage.
And 105, determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH.
Further, in order to improve the reliability of the determined target SOH of the power battery, the first SOH, the second SOH and the third SOH are weighted and summed to obtain the target SOH of the power battery.
Wherein the weight coefficient K of the first SOH is set according to the importance degree of the cell voltage value in estimating the state of health of the batteryCellVoltage-pct；
setting a weight coefficient K of the second SOH according to the degree of importance of the accumulated discharge amount and the accumulated charge capacity in estimating the state of health of the batteryCharge-Discharge-pct；
Setting a weight coefficient K of the third SOH according to the importance degree of the direct current internal resistance value in estimating the health state of the batteryR-pct。
Herein, the target SOH of the power battery is recorded as SOHpack-pctIn% by weight.
specifically, the target SOH of the power battery is according to equation (7), wherein each weight coefficient satisfies equation (8).
SOHpack-pct＝KCellVoltage-pct*SOHCellVoltage-pct+Kcharge-Discharge-pct*SOHCharge-Discharge-pct+KR-pct*SOHR-pct (7)
KCellVoltage-pct+Kcharge-Discharge-pct+KR-pct＝1 (8)。
According to the method for determining the state of health (SOH) of the power battery, the highest single voltage value, the lowest single voltage value, the accumulated charging amount and the accumulated discharging amount of the power battery are obtained, and the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point are obtained; determining a first SOH according to the highest single voltage value and the lowest single voltage value; determining a second SOH according to the accumulated discharge capacity and the accumulated charge capacity; determining a third SOH according to the initial direct current internal resistance value and the second direct current internal resistance value; and determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH. Therefore, the SOH of the battery can be automatically estimated in real time on line, the test data of the battery core and the current running state of the vehicle are fully combined in the estimation of the SOH, and the estimation effect is better. Meanwhile, the SOH of the battery is estimated more accurately by adopting various factors such as the highest single voltage value, the lowest single voltage value, the accumulated charging amount and the accumulated discharging amount of the power battery, the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point, the estimation deviation of the SOH of the battery caused by only considering a single factor is avoided as much as possible, and the estimation precision of the SOH of the power battery is improved.
fig. 4 is a schematic structural diagram of a power battery state of health SOH determination apparatus according to an embodiment of the present application.
As shown in fig. 4, the apparatus for determining state of health, SOH, of a power battery includes an obtaining module 110, a first determining module 120, a second determining module 130, and a third determining module 140, wherein:
The obtaining module 110 is configured to obtain a highest cell voltage value of the power battery before charging and a lowest cell voltage value of the power battery after charging, obtain a current accumulated charging amount and an accumulated discharging amount of the power battery, and obtain a current dc internal resistance value of the power battery and an initial dc internal resistance value at a beginning point of life BOL stage.
The first determining module 120 is configured to determine the first SOH according to the highest cell voltage value and the lowest cell voltage value.
The second determining module 130 is configured to determine a second SOH of the power battery according to the current accumulated charge amount and the accumulated discharge amount of the power battery.
the third determining module 140 is configured to determine a third SOH of the power battery according to the current dc internal resistance value and the initial dc internal resistance value; and the fourth determination module is used for determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH.
In an embodiment of the present application, the first determining module 120 is specifically configured to: acquiring the current charging capacity of the power battery, the battery charge state corresponding to the highest single voltage value and the battery charge state corresponding to the lowest single voltage value; determining the real full capacity of the power battery according to the charging capacity, the battery charge state corresponding to the highest single voltage value and the battery charge state corresponding to the lowest single voltage value; acquiring preset discharge electric quantity of a power battery; and determining the first SOH according to the real full capacity and the preset discharging electric quantity.
In an embodiment of the present application, the second determining module 130 is specifically configured to: acquiring a nominal accumulated discharge amount and a nominal accumulated charge amount of the power battery in the whole life cycle; determining the discharging SOH of the power battery according to the nominal accumulated discharging amount and the accumulated discharging amount; determining the discharging SOH of the power battery according to the nominal accumulated charging amount and the accumulated charging amount; and determining a second SOH of the power battery according to the discharging SOH and the charging SOH.
In an embodiment of the present application, the second determining module 130 is specifically configured to: the smaller of the discharged SOH and the charged SOH is determined as a second SOH.
In an embodiment of the present application, the third determining module 140 is specifically configured to: and determining a third SOH of the power battery according to the ratio of the current direct current internal resistance value to the initial direct current internal resistance value.
It should be noted that the foregoing explanation of the embodiment of the method for determining the state of health SOH of the power battery is also applicable to the device for determining the state of health SOH of the power battery of the embodiment, and the implementation principle is similar, and is not described herein again.
The device for determining the state of health (SOH) of the power battery of the embodiment of the application obtains the highest single voltage value, the lowest single voltage value, the accumulated charge amount and the accumulated discharge amount of the power battery, and the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point; determining a first SOH according to the highest single voltage value and the lowest single voltage value; determining a second SOH according to the accumulated discharge capacity and the accumulated charge capacity; determining a third SOH according to the initial direct current internal resistance value and the second direct current internal resistance value; and determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH. Therefore, the SOH of the battery can be automatically estimated in real time on line, the test data of the battery core and the current running state of the vehicle are fully combined in the estimation of the SOH, and the estimation effect is better. Meanwhile, the SOH of the battery is estimated more accurately by adopting various factors such as the highest single voltage value, the lowest single voltage value, the accumulated charging amount and the accumulated discharging amount of the power battery, the initial direct current internal resistance value and the current direct current internal resistance value of the power battery at the BOL stage of the service life starting point, the estimation deviation of the SOH of the battery caused by only considering a single factor is avoided as much as possible, and the estimation precision of the SOH of the power battery is improved.
In order to achieve the above object, an embodiment of a third aspect of the present application provides an electric vehicle, including the power battery state of health SOH determination apparatus of the above embodiment.
The embodiment of the application also provides an electric automobile which comprises the battery state of health SOH determining device of the embodiment.
Fig. 5 is a schematic structural diagram of another battery state of health SOH determination apparatus according to an embodiment of the present application. The battery state of health SOH determination device includes:
memory 1001, processor 1002, and computer programs stored on memory 1001 and executable on processor 1002.
The processor 1002, when executing the program, implements the power battery state of health SOH determination method provided in the above-described embodiments.
Further, the battery state of health SOH determining apparatus further includes:
A communication interface 1003 for communicating between the memory 1001 and the processor 1002.
a memory 1001 for storing computer programs that may be run on the processor 1002.
memory 1001 may include high-speed RAM memory and may also include non-volatile memory (e.g., at least one disk memory).
And the processor 1002 is used for implementing the power battery state of health SOH determination method of the embodiment when executing the program.
If the memory 1001, the processor 1002, and the communication interface 1003 are implemented independently, the communication interface 1003, the memory 1001, and the processor 1002 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (enhanced Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 3, but this does not mean only one bus or one type of bus.
Optionally, in a specific implementation, if the memory 1001, the processor 1002, and the communication interface 1003 are integrated on one chip, the memory 1001, the processor 1002, and the communication interface 1003 may complete communication with each other through an internal interface.
the processor 1002 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present Application.
The present application also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a power cell state of health, SOH, determination method as above.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
it will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
in addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. A method for determining the state of health (SOH) of a power battery is characterized by comprising the following steps:
Acquiring a highest single voltage value of a power battery before charging and a lowest single voltage value of the power battery after charging, acquiring a current accumulated charging amount and an accumulated discharging amount of the power battery, and acquiring a current direct current internal resistance value of the power battery and an initial direct current internal resistance value at a service life starting point BOL stage;
Determining a first SOH according to the highest cell voltage value and the lowest cell voltage value;
Determining a second SOH of the power battery according to the current accumulated charging amount and the accumulated discharging amount of the power battery;
Determining a third SOH of the power battery according to the current direct current internal resistance value and the initial direct current internal resistance value;
And determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH.
2. The method of claim 1, wherein said determining a first SOH based on said highest cell voltage value and said lowest cell voltage value comprises:
acquiring the current charging capacity of the power battery, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value;
Determining the real full capacity of the power battery according to the charging capacity, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value;
Acquiring preset discharge electric quantity of the power battery;
And determining the first SOH according to the real full capacity and the preset discharging electric quantity.
3. The method of claim 1,
the determining the second SOH of the power battery according to the current accumulated charging amount and the accumulated discharging amount of the power battery comprises the following steps:
Acquiring a nominal accumulated discharge amount and a nominal accumulated charge amount of the power battery in the whole life cycle;
Determining the discharging SOH of the power battery according to the nominal accumulated discharging amount and the accumulated discharging amount;
Determining the discharging SOH of the power battery according to the nominal accumulated charging amount and the accumulated charging amount;
And determining the second SOH of the power battery according to the discharging SOH and the charging SOH.
4. The method of claim 3, wherein said determining said second SOH for said power cell based on said discharged SOH and said charged SOH comprises:
Determining a smaller value of the discharging SOH and the charging SOH as the second SOH.
5. The method of claim 1, wherein determining the third SOH of the power cell based on the current dc internal resistance value and the initial dc internal resistance value comprises:
And determining a third SOH of the power battery according to the ratio of the current direct current internal resistance value to the initial direct current internal resistance value.
6. A power battery state of health, SOH, determination apparatus, comprising:
The acquisition module is used for acquiring the highest single voltage value of the power battery before charging and the lowest single voltage value of the power battery after charging, acquiring the current accumulated charging amount and the current accumulated discharging amount of the power battery, and acquiring the current direct current internal resistance value of the power battery and the initial direct current internal resistance value at the BOL stage of the service life starting point;
the first determining module is used for determining a first SOH according to the highest cell voltage value and the lowest cell voltage value;
the second determination module is used for determining a second SOH of the power battery according to the current accumulated charging amount and the accumulated discharging amount of the power battery;
The third determining module is used for determining a third SOH of the power battery according to the current direct current internal resistance value and the initial direct current internal resistance value;
and the fourth determination module is used for determining the target SOH of the power battery according to the first SOH, the second SOH and the third SOH.
7. the apparatus of claim 6, wherein the first determining module is specifically configured to:
Acquiring the current charging capacity of the power battery, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value;
Determining the real full capacity of the power battery according to the charging capacity, the battery charge state corresponding to the highest cell voltage value and the battery charge state corresponding to the lowest cell voltage value;
acquiring preset discharge electric quantity of the power battery;
And determining the first SOH according to the real full capacity and the preset discharging electric quantity.
8. An electric vehicle, comprising:
The battery state of health SOH determination apparatus as claimed in any one of claims 6 to 7.
9. A power battery state of health, SOH, determination apparatus, comprising:
Memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, implements the power cell state of health SOH determination method according to any of claims 1-5.
10. a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method for determining the state of health, SOH, of a power cell according to any one of claims 1 to 5.
CN201910828811.3A 2019-09-03 2019-09-03 SOH (state of health) determination method and device for power battery Pending CN110568375A (en)

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CN114035049A (en) * 2021-11-08 2022-02-11 东软睿驰汽车技术（沈阳）有限公司 SOH precision calculation method and device and electronic equipment
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