CN111650523A - SOC calibration method based on multi-point static voltage - Google Patents

SOC calibration method based on multi-point static voltage Download PDF

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CN111650523A
CN111650523A CN202010495020.6A CN202010495020A CN111650523A CN 111650523 A CN111650523 A CN 111650523A CN 202010495020 A CN202010495020 A CN 202010495020A CN 111650523 A CN111650523 A CN 111650523A
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soc
electric quantity
battery
charging
current
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吴磊
赵国华
张静雅
张梅
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Chery Commercial Vehicle Anhui Co Ltd
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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]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
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  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of electric quantity correction, and provides a multipoint static voltage-based SOC calibration method, which comprises the following steps: s1, detecting whether the electric battery is in a discharging state; s2, if the detection result is yes, detecting whether the power battery is in a standing state; s3, if the detection result is yes, the state of charge SOC is corrected based on the open circuit voltage OCV in the stationary state. In the driving process, the SOC value of the battery of the electric automobile can be calibrated for many times by using the static voltage of the battery in a short time such as a long-time traffic light and a temporary rest in a service area, so that the accuracy of displaying the SOC of the electric quantity is improved, and a driver can conveniently control the residual electric quantity and the driving distance of the battery pack.

Description

SOC calibration method based on multi-point static voltage
Technical Field
The invention relates to the technical field of electric quantity calibration, and provides a multi-point static voltage-based SOC calibration method.
Background
When the battery is sufficiently stationary, the SOC value corresponding to the OCV (open circuit voltage) is searched for by the open circuit voltage method of the battery, and the SOC obtained by the ampere-hour integration method is corrected at the time of power-up by using the value, which is called an OCV static calibration method. Although the method can effectively solve the problem of inaccurate SOC caused by accumulated errors in the calculation process of the ampere-hour integration method, the method can only carry out calibration at the power-on moment, and the real-time detection and calibration cannot be carried out in the vehicle driving process. Due to the acquisition error caused by too complicated current in the discharging process and the self-accumulation error of the battery management system, the error value of the SOC obtained by ampere-hour integral calculation is larger and larger. The SOC has a large error before charging, and the SOC estimation can not be performed only by ampere-hour integration in the charging process, so that the SOC jump or the full-charge calibration time is too long at the end of charging, which causes poor customer experience and causes panic and complaint.
Disclosure of Invention
The invention provides a multi-point static voltage-based SOC calibration method, which improves the accurate display degree of SOC and avoids display jump of the SOC as much as possible.
The invention is realized in such a way that a SOC calibration method based on multi-point static voltage specifically comprises the following steps:
s1, detecting whether the electric battery is in a discharging state;
s2, if the detection result is yes, detecting whether the power battery is in a standing state;
s3, if the detection result is yes, the state of charge SOC is corrected based on the open circuit voltage OCV in the stationary state.
Further, the standing state during the discharging process needs to satisfy the following conditions:
condition 1: the vehicle is in a starting state, and the single voltage of the power battery is stable;
condition 2: discharge current less than current threshold I1And the duration exceeds the duration T2。
Further, the electric quantity correction process of the electric quantity SOC specifically includes the following steps:
s31, standingThe open circuit voltage OCV and the battery temperature to find the corresponding electric quantity SOC1；
S32, acquiring the current available electric quantity SOC recorded by the BMS0；
S33, calculating electric quantity SOC1And the electric quantity SOC0△ SOC at the corrected time period tsTime-sharing compensation is carried out on the difference value △ SOC, and the electric quantity SOC in the discharging process is calculated in real timePutAnd synchronously updating the current available electric quantity recorded by the battery management system BMS.
Further, the electric quantity SOC in the discharging processPutThe calculation is specifically as follows:
Figure RE-GDA0002607527600000021
wherein, tsFor the correction period, λ is the amount of correction of the electric quantity per unit time, λ is the difference between the electric quantity △ SOC and the correction period tsI is a discharge current value, and when i is the discharge current value, the value is negative, caprealIs the current capacity of the power battery, t0Is the electric quantity SOC0Corresponding discharge time t1＝t0+ts，SOC2Is t1The amount of power at the moment.
Further, if the power battery is in a charging state, the SOC correction process of the charging process is as follows:
and S4, detecting whether the power battery meets the charging calibration condition at present, and if so, correcting the electric quantity SOC based on the current dynamic voltage.
Further, the calibration conditions for the charging process are: the charging current is less than the preset current value I2And the duration is longer than the duration T3。
Further, the method for correcting the electric quantity SOC in the charging process specifically comprises the following steps:
s41, searching corresponding electric quantity SOC based on the current dynamic voltage V and the battery temperature of the power battery4；
S42, acquiring battery management system BMSRecording current available electric quantity SOC3；
S43, calculating electric quantity SOC4And the electric quantity SOC3△ SOC at the corrected time period tsTime-sharing compensation is carried out on the difference value △ SOC, and the electric quantity SOC in the discharging process is calculated in real timeCharging deviceAnd synchronously updating the current available electric quantity recorded by the battery management system BMS.
Further, the electric quantity SOC in the charging processCharging deviceThe correction calculation is specifically as follows:
Figure RE-GDA0002607527600000031
wherein, tsFor the correction period, λ is the amount of correction of the electric quantity per unit time, λ is the difference between the electric quantity △ SOC and the correction period tsI is a charging current value, and when i is the charging current value, the value is positive, caprealIs the current capacity of the power battery, t2Is the electric quantity SOC3Corresponding charging time, t3＝t2+ts，SOC5Is t3The amount of power at the moment.
The SOC calibration method based on the multi-point static voltage has the following beneficial technical effects:
1) in the driving process, the SOC value of the battery of the electric automobile can be calibrated for many times by using the static voltage of the battery in a short time, such as a long-time traffic light and the like, and a temporary rest in a service area and the like, so that the accuracy of displaying the SOC of the electric quantity is improved, and a driver can conveniently control the residual electric quantity and the driving distance of the battery pack;
2) the time-sharing compensation is carried out on the electric quantity difference value delta SOC in the charging and discharging processes, the jump of the displayed electric quantity SOC is avoided, and the trust degree of a user is improved.
Drawings
Fig. 1 is a flowchart of a SOC calibration method based on multi-point static voltages according to an embodiment of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of an SOC calibration method based on multi-point static voltages according to an embodiment of the present invention, where the method specifically includes the following steps:
s1, detecting whether the electric battery is in a discharging state;
s2, if the detection result is yes, detecting whether the power battery is in a standing state;
in the embodiment of the invention, the standing state in the discharging process needs to satisfy the following conditions:
condition 1: the vehicle is in a starting state, the single voltage of the power battery is stable, the single voltage is stable, namely the single voltage value has small fluctuation, and the stable time length is longer than the time length T1Length of time T1The value range of (1) to (5) min;
condition 2: discharge current less than current threshold I1Determining a current threshold I based on the current minimum discharge power of the whole vehicle1And the duration exceeds the duration T2，T2The value range of (1) to (5) min;
s3, if the detection result is yes, the SOC is corrected based on the open circuit voltage in the static state.
In the embodiment of the present invention, the process of correcting the electric quantity of the electric quantity SOC specifically includes the following steps:
s31, searching corresponding electric quantity SOC based on open-circuit voltage OCV and battery temperature in static state1；
A three-dimensional data table consisting of temperature, open-circuit voltage OCV and electric quantity SOC of a battery monomer is pre-established, the three-dimensional data table is stored in a battery management system BMS, and the corresponding electric quantity SOC can be searched based on the open-circuit voltage OCV and the battery temperature1。
S32, acquiring the current available electric quantity SOC recorded by the BMS0；
S33, calculating electric quantity SOC1And the electric quantity SOC0△ SOC at the corrected time period tsTime-sharing compensation is carried out on the difference value △ SOC, and the electric quantity SOC in the discharging process is calculated in real timePutAnd synchronously update the battery management system BMS recordsThe current available power;
in the embodiment of the invention, the correction duration t is determined according to the specific smoothing effect requirement and the charge-discharge estimated residual timesSOC of electric quantity in discharging processPutThe calculation is specifically as follows:
Figure RE-GDA0002607527600000051
wherein, tsFor the correction period, λ is the amount of correction of the electric quantity per unit time, λ is the difference between the electric quantity △ SOC and the correction period tsI is a discharge current value, and when i is a discharge current, the value is negative, caprealIs the current capacity of the power battery, t0Is the electric quantity SOC0Corresponding discharge time t1＝t0+ts，SOC2Is t1Electric quantity at time t1And in the discharging process after the moment, updating the current electric quantity based on an ampere-hour integral method.
In the embodiment of the present invention, if the power battery is in the charging state, the SOC correction process of the charging process is specifically as follows:
s4, detecting whether the power battery meets the charging calibration condition at present, and if so, correcting the SOC based on the current dynamic voltage;
in this embodiment, the calibration conditions of the charging process are: the charging current is less than the preset current value I2(not greater than 0.2C) and a duration greater than the duration T3Length of time T3The value range of (1-5 min), and the method for correcting the electric quantity SOC in the charging process specifically comprises the following steps:
s41, searching corresponding electric quantity SOC based on the current dynamic voltage V and the battery temperature of the power battery4；
A three-dimensional data table of the battery monomer, which consists of temperature and dynamic voltage V, SOC, is established in advance, the three-dimensional data table is stored in a battery management system BMS, and the corresponding electric quantity SOC can be found based on the open-circuit voltage OCV and the battery temperature4。
S42, obtaining electricityCurrent available electric quantity SOC recorded by pool management system BMS3；
S43, calculating electric quantity SOC4And the electric quantity SOC3△ SOC at the corrected time period tsTime-sharing compensation is carried out on the difference value △ SOC, and the electric quantity SOC in the discharging process is calculated in real timeCharging deviceAnd synchronously updating the current available electric quantity recorded by the battery management system BMS;
in the embodiment of the invention, the correction duration t is determined according to the specific smoothing effect requirement and the charge-discharge estimated residual timesSOC of electric quantity in charging processCharging deviceThe correction calculation is specifically as follows:
Figure RE-GDA0002607527600000061
wherein, tsFor the correction period, λ is the amount of correction of the electric quantity per unit time, λ is the difference between the electric quantity △ SOC and the correction period tsI is the charging current value, and when i is the charging current, the value is positive, caprealIs the current capacity of the power battery, t2Is the electric quantity SOC3Corresponding charging time, t3＝t2+ts，SOC5Is t3Electric quantity at time t3And in the charging process after the moment, updating the current electric quantity based on an ampere-hour integral method.
The SOC calibration method based on the multi-point static voltage has the following beneficial technical effects:
1) in the driving process, the SOC value of the battery of the electric automobile can be calibrated for many times by using the static voltage of the battery in a short time, such as a long-time traffic light and the like, and a temporary rest in a service area and the like, so that the accuracy of displaying the SOC of the electric quantity is improved, and a driver can conveniently control the residual electric quantity and the driving distance of the battery pack;
2) the time-sharing compensation is carried out on the electric quantity difference value delta SOC in the charging and discharging processes, the jump of the displayed electric quantity SOC is avoided, and the trust degree of a user is improved.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.

Claims (8)

1. A SOC calibration method based on multi-point static voltage is characterized by specifically comprising the following steps:
s1, detecting whether the electric battery is in a discharging state;
s2, if the detection result is yes, detecting whether the power battery is in a standing state;
s3, if the detection result is yes, the state of charge SOC is corrected based on the open circuit voltage OCV in the stationary state.
2. The method for multi-point static voltage-based SOC calibration according to claim 1, wherein the static state during discharging is satisfied as follows:
condition 1: the vehicle is in a starting state, and the single voltage of the power battery is stable;
condition 2: discharge current less than current threshold I1And the duration exceeds the duration T2。
3. The multi-point static voltage-based SOC calibration method according to claim 1 or 2, wherein the SOC calibration process of the SOC specifically includes the following steps:
s31, searching corresponding electric quantity SOC based on open-circuit voltage OCV and battery temperature in static state1；
S32, acquiring the current available electric quantity SOC recorded by the BMS0；
S33, calculating electric quantity SOC1And the electric quantity SOC0△ SOC at the corrected time period tsTime-sharing compensation is carried out on the difference value △ SOC, and the electric quantity SOC in the discharging process is calculated in real timePutAnd synchronously updating the current available electric quantity recorded by the battery management system BMS.
4. The method for multi-point quiescent voltage-based SOC calibration according to claim 3, wherein during dischargeElectric quantity SOCPutThe calculation is specifically as follows:
Figure FDA0002522505010000021
wherein, tsFor the correction period, λ is the amount of correction of the electric quantity per unit time, λ is the difference between the electric quantity △ SOC and the correction period tsI is a discharge current value, and when i is the discharge current value, the value is negative, caprealIs the current capacity of the power battery, t0Is the electric quantity SOC0Corresponding discharge time t1＝t0+ts，SOC2Is t1The amount of power at the moment.
5. The multi-point static voltage-based SOC calibration method of claim 1, wherein if the power battery is in a charging state, the SOC correction process of the charging process is as follows:
and S4, detecting whether the power battery meets the charging calibration condition at present, and if so, correcting the electric quantity SOC based on the current dynamic voltage.
6. The method for multi-point quiescent voltage based SOC calibration according to claim 5, wherein the calibration conditions during charging are: the charging current is less than the preset current value I2And the duration is longer than the duration T3。
7. The multi-point static voltage-based SOC calibration method according to claim 5 or 6, wherein the SOC calibration method for the battery charge during the charging process specifically comprises the following steps:
s41, searching corresponding electric quantity SOC based on the current dynamic voltage V and the battery temperature of the power battery4；
S42, acquiring the current available electric quantity SOC recorded by the BMS3；
S43, calculating electric quantity SOC4And the electric quantity SOC3△ SOC at the corrected time period tsInternal will be poorThe value △ SOC carries out time-sharing compensation, and the electric quantity SOC in the discharging process is calculated in real timeCharging deviceAnd synchronously updating the current available electric quantity recorded by the battery management system BMS.
8. The multi-point quiescent voltage-based SOC calibration method of claim 7, wherein the SOC of the charge during chargingCharging deviceThe correction calculation is specifically as follows:
Figure FDA0002522505010000031
wherein, tsFor the correction period, λ is the amount of correction of the electric quantity per unit time, λ is the difference between the electric quantity △ SOC and the correction period tsI is a charging current value, and when i is the charging current value, the value is positive, caprealIs the current capacity of the power battery, t2Is the electric quantity SOC3Corresponding charging time, t3＝t2+ts，SOC5Is t3The amount of power at the moment.
CN202010495020.6A 2020-06-03 2020-06-03 SOC calibration method based on multi-point static voltage Pending CN111650523A (en)

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Cited By (3)

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CN114067457A (en) * 2021-11-15 2022-02-18 合众新能源汽车有限公司 Method for calculating endurance mileage according to SOC prediction value
CN114407727A (en) * 2022-01-24 2022-04-29 四川野马汽车股份有限公司 Method and system for estimating charging remaining time of electric automobile
CN116754980A (en) * 2023-08-14 2023-09-15 宁德时代新能源科技股份有限公司 Method, device, power consumption device and storage medium for determining SOH value of battery

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Publication number Priority date Publication date Assignee Title
CN114067457A (en) * 2021-11-15 2022-02-18 合众新能源汽车有限公司 Method for calculating endurance mileage according to SOC prediction value
CN114067457B (en) * 2021-11-15 2023-12-22 合众新能源汽车股份有限公司 Method for calculating endurance mileage according to SOC prediction value
CN114407727A (en) * 2022-01-24 2022-04-29 四川野马汽车股份有限公司 Method and system for estimating charging remaining time of electric automobile
CN116754980A (en) * 2023-08-14 2023-09-15 宁德时代新能源科技股份有限公司 Method, device, power consumption device and storage medium for determining SOH value of battery
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