CN110058177A - A kind of power battery electricity SOC modification method - Google Patents

A kind of power battery electricity SOC modification method Download PDF

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Publication number
CN110058177A
CN110058177A CN201910372060.9A CN201910372060A CN110058177A CN 110058177 A CN110058177 A CN 110058177A CN 201910372060 A CN201910372060 A CN 201910372060A CN 110058177 A CN110058177 A CN 110058177A
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soc
electricity
testing result
battery
current
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CN110058177B (en
Inventor
黄芳芳
宋开通
何晶
闫鹤
吴亚东
李涛
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Chery New Energy Automobile Technology Co Ltd
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Chery New Energy Automobile Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005Testing of electric installations on transport means
    • G01R31/006Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385Arrangements for measuring battery or accumulator variables
    • G01R31/387Determining ampere-hour charge capacity or SoC
    • G01R31/388Determining ampere-hour charge capacity or SoC involving voltage measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392Determining battery ageing or deterioration, e.g. state of health

Abstract

The present invention relates to power battery charging technical fields, provide a kind of power battery electricity SOC modification method, the method includes as follows: S1, the bus current based on battery pack calculate initial quantity of electricity SOCo;S2, open-circuit voltage OCV, active volume Q are based onk, residual capacity QsAnd cycle life SOH is to initial quantity of electricity SOCoIt is modified, exports revised electricity SOCf.Resulting initial SOC is calculated to based on bus currentoCarry out the amendment of open-circuit voltage OCV, active volume, residual capacity, cycle life SOH four dimensions, improve electricity estimate accuracy, battery SOC can be allowed to be maintained in reasonable target zone always, prevent battery from occurring overcharging, the phenomena of the failure such as over-discharge, vehicle are sat, effectively extend the service life of battery and promote customer experience, reduces the operating cost of electric car.

Description

A kind of power battery electricity SOC modification method
Technical field
The present invention relates to power battery technology fields, provide a kind of power battery electricity SOC modification method.
Background technique
Batteries of electric automobile residual capacity SOC (State of Charge) estimation is used as battery management system BMS The key technology point of (Battery Management System) is entire car controller VCU (Vehicle Control Unit) The important evidence of course continuation mileage estimation.SOC is defined as accounting in current battery according to the capacity that regulation discharging condition can discharge The percentage of active volume, influence factor many (such as battery cycle life, initial SOC, the active volumes, electric current of SOC estimation Deng), the complex working condition during electric car charge and discharge also makes SOC estimation, and accuracy is lower in actual use, and SOC exists Error is difficult that battery SOC is allowed to maintain always in reasonable target zone, easily leads to over-charging of battery or over-discharge or even vehicle It sits, the serious service life and customer experience for reducing battery increases the operating cost of electric car.
SOC estimation at present mostly uses open circuit voltage method greatly, is based only upon open-circuit voltage and carries out SOC amendment, it is difficult to guarantee battery System keeps high-precision in charge and discharge overall process.
Summary of the invention
The present invention provides a kind of power battery electricity SOC modification methods, resulting first for being calculated based on bus current Beginning SOCo, the amendment of open-circuit voltage OCV, active volume, residual capacity, cycle life SOH four dimensions are carried out, electricity is improved Estimate accuracy.
To achieve the goals above, a kind of power battery electricity SOC modification method, this method specifically comprise the following steps:
S1, the bus current based on battery pack calculate initial quantity of electricity SOCo
S2, open-circuit voltage OCV, active volume Q are based onk, residual capacity QsAnd cycle life SOH is to initial quantity of electricity SOCoInto Row amendment, exports revised electricity SOCf
Further, the step S2 specifically comprises the following steps:
When battery management system initializes, whether first parameter that detection battery control system BCU is read is open circuit Voltage OCVo
If testing result be it is yes, be based on open-circuit voltage OCVoTo initial quantity of electricity SOCoIt is modified, exports electricity correction value SOCm1, then active volume, residual capacity and cycle life SOH are based respectively on to SOCm1Education just, exports SOCf
If testing result be it is no, be based respectively on active volume, residual capacity and cycle life SOH to initial quantity of electricity SOCo It is modified, exports electricity correction value SOCm2, then it is based on open-circuit voltage OCVoTo SOCm2Education just, exports SOCf
Further, the electricity modification method based on open-circuit voltage specifically comprises the following steps:
When S1, battery management system initialization, current electric quantity SOC is read1
S2, it is based on open-circuit voltage OCVoSearch corresponding electricity SOC2
S3, judge SOC1Whether SOC is greater thanThreshold value 1
If S4, testing result be then follow the steps S5, if testing result be it is no, then follow the steps S6;
S5, detection electricity SOC1With electricity SOC2Difference whether be greater than SOCThreshold value 2If testing result be it is yes, by electricity SOC1It is modified to electricity SOC2If testing result is no, not to electricity SOC1It is modified;
S6, detection electricity SOC1Whether SOC is greater than2If testing result be it is no, S7 is thened follow the steps, if testing result is It is to then follow the steps S8;
S7, detection electricity SOC1Whether SOC is less thanThreshold value 5, and electricity SOC2Whether SOC is greater thanThreshold value 4If testing result be it is yes, Then by electricity SOC1It is modified to electricity SOC2If testing result is no, not to electricity SOC1It is modified;
S8, detection electricity SOC1With electricity SOC2Difference whether be less than SOCThreshold value 3If testing result be it is yes, by electricity SOC1It is modified to electricity (SOC2+SOC1)/2, if testing result be it is no, by electricity SOC1It is modified to electricity SOC2
Further, upon step s 2 further include:
S9, detection current electric quantity SOC1Read whether successfully read, if testing result be it is no, current electric quantity is modified to Electricity SOC2If testing result be it is yes, then follow the steps S3.
Further, the electricity modification method based on active volume specifically comprises the following steps:
When S21, battery management system initialization, active volume Q is readko, while acquire the voltage of power battery, temperature and Electric current, and it is uploaded to battery control system BCU;
S22, the current charge and discharge mode of vehicle is read, comprising: fast charge mode, trickle charge mode and discharge mode;
S23, under current charge and discharge mode, determine current voltage, temperature and the corresponding available power Q of electric currentk1
S24, by active volume QkoIt is modified to available power Qk1, and it is based on available power Qk1Correct current electric quantity.
Further, the electricity amendment stream method based on residual capacity specifically comprises the following steps:
When S31, battery management system initialization, residual capacity Q is readso
S32, current remaining capacity value Q is calculated based on the current charge value of power battery and active volume values1
S33, verification remaining capacity value Qs1Whether with residual capacity QsoIt is equal;
If S34, check results be it is yes, export residual capacity QsoIf inspection result be it is no, by residual capacity QsoAmendment For residual capacity Qs1
Further, the electricity modification method based on cycle life specifically comprises the following steps:
When S41, battery management system initialization, current electric quantity SOC is read3And cycle life SOHo
S42, it is based on current electric quantity SOC3Calculate current cycle life SOH1
S43, judge cycle life SOHoWith cycle life SOH1Difference whether be less than SOHThreshold value
S44, if it is determined that result be it is yes, by SOH1*SOC3It is assigned to SOC3, if it is determined that result be it is no, then not to current electric quantity SOC3It is modified.
Power battery SOC modification method provided by the invention has the following beneficial effects:
Resulting initial SOC is calculated to based on bus currentoIt carries out open-circuit voltage OCV, active volume, residual capacity, follow The amendment of ring service life SOH four dimensions, improves electricity estimate accuracy, and battery SOC can be allowed to maintain reasonable target always It in range, prevents battery from occurring overcharging, the phenomena of the failure such as over-discharge, vehicle are sat, effectively extends the service life and promotion of battery Customer experience reduces the operating cost of electric car.
Detailed description of the invention
Fig. 1 is power battery SOC modification method flow chart provided in an embodiment of the present invention;
Fig. 2 is that the electricity provided in an embodiment of the present invention based on open-circuit voltage corrects flow chart;
Fig. 3 is that the electricity provided in an embodiment of the present invention based on active volume corrects flow chart;
Fig. 4 is that the electricity provided in an embodiment of the present invention based on residual capacity corrects flow chart;
Fig. 5 is that the electricity provided in an embodiment of the present invention based on cycle life corrects flow chart.
Specific embodiment
A specific embodiment of the invention is made further detailed below against attached drawing by the description to optimum embodiment Thin explanation.
Hall sensor is equipped on the bus of battery pack, Hall sensor is connected by CAN line and battery control system BCU It connects, Hall sensor is uploaded to battery control system BCU, battery control system by CAN line for acquiring bus current BCU calculates initial quantity of electricity SOCoAnd it is based on open-circuit voltage OCV, active volume Qk, residual capacity QsAnd cycle life SOH is to initial Electricity SOCoIt is modified, exports revised charge value SOCf
Fig. 1 is power battery SOC modification method flow chart provided in an embodiment of the present invention, and this method specifically includes following step It is rapid:
When battery management system initializes, the current open-circuit voltage OCV of power battery can be read simultaneouslyo, active volume Qko、 Residual capacity QsoAnd cycle life SOHoFour parameter values, whether first parameter that detection battery control system BCU is read For open-circuit voltage OCVo
If testing result be it is yes, be based on open-circuit voltage OCVoTo initial quantity of electricity SOCoIt is modified, exports electricity correction value SOCm1, then active volume, residual capacity and cycle life SOH are based respectively on to SOCm1Education just, exports SOCf, held based on available Amount, residual capacity and cycle life SOH are to SOCm1Just, three makeover process divide without sequencing for education;
In embodiments of the present invention, in open-circuit voltage OCVoAmendment in battery management system initialization procedure and full electric mistake Cheng Jinhang, the amendment based on active volume, residual capacity and cycle life SOH only battery management system initialization procedure into Row.
If testing result be it is no, be based respectively on active volume, residual capacity and cycle life SOH to initial quantity of electricity SOCo It is modified, exports electricity correction value SOCm2, then it is based on open-circuit voltage OCVoTo SOCm2Education just, exports SOCf, based on available Capacity, residual capacity and cycle life SOH are to SOCm2Just, three makeover process divide without sequencing for education;
Residual capacity Qs is the capacity of current power remaining battery released, active volume QkWhen electricity full for power battery The capacity that can be released, OCV are open-circuit voltage,
Fig. 2 is that the electricity provided in an embodiment of the present invention based on open-circuit voltage corrects flow chart, which specifically wraps Include following steps:
When S1, battery management system initialization, current electric quantity SOC is read1
If received first parameter of battery control system BCU is open-circuit voltage, SOC1As SOCoIf battery control system Received first parameter of BCU of uniting is not open-circuit voltage, then SOC1To be repaired through active volume, residual capacity and cycle life SOH Charge value SOC after justm2
S2, it is based on open-circuit voltage OCVoTo find corresponding electricity SOC2, searched based on open-circuit voltage-electricity mapping table Open-circuit voltage OCVoCorresponding electricity SOC2
S3, detection SOC1Whether it is in full power state, that is, judges SOC1Whether SOC is greater thanThreshold value 1
If S4, testing result be then follow the steps S5, if testing result be it is no, then follow the steps S6;
S5, detection electricity SOC1With electricity SOC2Difference whether be greater than SOCThreshold value 2If testing result be it is yes, by electricity SOC1It is modified to electricity SOC2If testing result is no, not to electricity SOC1It is modified;
S6, detection electricity SOC1Whether SOC is greater than2If testing result be it is no, S7 is thened follow the steps, if testing result is It is to then follow the steps S8;
S7, detection electricity SOC1Whether SOC is less thanThreshold value 5, and electricity SOC2Whether SOC is greater thanThreshold value 4If testing result be it is yes, Then by electricity SOC1It is modified to electricity SOC2If testing result is no, not to electricity SOC1It is modified;
S8, detection electricity SOC1With electricity SOC2Difference whether be less than SOCThreshold value 3If testing result be it is yes, by electricity SOC1It is modified to electricity (SOC2+SOC1)/2, if testing result be it is no, by electricity SOC1It is modified to electricity SOC2
In embodiments of the present invention, upon step s 2 further include:
S9, detection current electric quantity SOC1Read whether successfully read, if testing result be it is no, current electric quantity is modified to Electricity SOC2If testing result be it is yes, then follow the steps S3.
In embodiments of the present invention, after step S1 further include:
Whether the current operating voltage of S10, detection is greater than setting operating voltage V1;
If S11, testing result be it is yes, then follow the steps S2, if testing result be it is no, execute step S10.
In embodiments of the present invention, SOCThreshold value 1Value be 99.9%, SOCThreshold value 2And SOCThreshold value 3Indicate electricity reading value SOC1 It tables look-up value SOC with electricity2Difference, SOCThreshold value 2Value 20%, SOCThreshold value 3Value 10%, SOCThreshold value 4With SOCThreshold value 2Value base This identical, SOCThreshold value 5With SOCThreshold value 3Value it is essentially identical.
Fig. 3 is that the electricity provided in an embodiment of the present invention based on active volume corrects flow chart, which specifically wraps Include following steps:
When S21, battery management system initialization, active volume Q is readko, while acquire the voltage of power battery, temperature and Electric current, and it is uploaded to battery control system BCU;
S22, the current charge and discharge mode of vehicle is read, comprising: fast charge mode, trickle charge mode and discharge mode;
S23, under current charge and discharge mode, determine current voltage, temperature and the corresponding available power Q of electric currentk1, in electricity There are three types of voltage-temperature-current-active volume mapping tables under charge and discharge mode for pond control system BCU storage, in Fig. 3 Table one, table two and table three, table one are voltage-temperature-current-active volume mapping table under fast charge mode, and table two is trickle charge mould Voltage-temperature-current-active volume mapping table under formula, table three are voltage-temperature-current-active volume under discharge mode Mapping table, and the available power Q for acquisition of tabling look-upk1Q is used respectivelyk11、Qk12And Qk13It indicates, it is assumed that be currently at fast charge mode, battery Control system BCU searches current voltage, temperature and electric current based on table one come corresponding available power Qk1
S24, by active volume QkoIt is modified to available power Qk1, and it is based on available power Qk1Current electric quantity is corrected, that is, is based on Previous cycle service life of power battery and current remaining capacity calculate current electric quantity.
Fig. 4 is that the electricity provided in an embodiment of the present invention based on residual capacity corrects flow chart, which specifically wraps Include following steps:
When S31, battery management system initialization, residual capacity Q is readso
S32, current remaining capacity value Q is calculated based on the current charge value of power battery and active volume values1
S33, verification remaining capacity value Qs1Whether with residual capacity QsoIt is equal;
If S34, check results be it is yes, export residual capacity QsoIf inspection result be it is no, by residual capacity QsoAmendment For residual capacity Qs1
Step S31~step S34 is mainly the correction course of a residual capacitance, for correcting the storage of residual capacity It is whether normal, the abnormal residual capacity of storage is corrected.
Fig. 5 is that the electricity provided in an embodiment of the present invention based on cycle life corrects flow chart, which specifically wraps Include following steps:
When S41, battery management system initialization, current electric quantity SOC is read3And cycle life SOHo
In embodiments of the present invention, if battery control system BCU's is modified to the amendment based on cycle life, electricity for the first time Measure SOC3As electricity SOCo, otherwise, electricity SOC3For last time revised charge value.
S42, it is based on current electric quantity SOC3Calculate current cycle life SOH1
S43, judge cycle life SOHoWith cycle life SOH1Difference whether be less than SOHThreshold value
S44, if it is determined that result be it is yes, by SOH1*SOC3It is assigned to SOC3, if it is determined that result be it is no, then not to current electric quantity SOC3It is modified.
Power battery SOC modification method provided by the invention has the following beneficial effects:
Resulting initial SOC is calculated to based on bus currentoIt carries out open-circuit voltage OCV, active volume, residual capacity, follow The amendment of ring service life SOH four dimensions, improves electricity estimate accuracy, and battery SOC can be allowed to maintain reasonable target always It in range, prevents battery from occurring overcharging, the phenomena of the failure such as over-discharge, vehicle are sat, effectively extends the service life and promotion of battery Customer experience reduces the operating cost of electric car.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as using method concept and skill of the invention The improvement for the various unsubstantialities that art scheme carries out, it is within the scope of the present invention.

Claims (7)

1. a kind of power battery electricity SOC modification method, which is characterized in that the method includes as follows:
S1, the bus current based on battery pack calculate initial quantity of electricity SOCo
S2, open-circuit voltage OCV, active volume Q are based onk, residual capacity QsAnd cycle life SOH is to initial quantity of electricity SOCoIt is repaired Just, revised electricity SOC is exportedf
2. power battery electricity SOC modification method as described in claim 1, which is characterized in that the step S2 specifically include as Lower step:
When battery management system initializes, whether first parameter that detection battery control system BCU is read is open-circuit voltage OCVo
If testing result be it is yes, be based on open-circuit voltage OCVoTo initial quantity of electricity SOCoIt is modified, exports electricity correction value SOCm1, then active volume, residual capacity and cycle life SOH are based respectively on to SOCm1Education just, exports SOCf
If testing result be it is no, be based respectively on active volume, residual capacity and cycle life SOH to initial quantity of electricity SOCoIt carries out Amendment exports electricity correction value SOCm2, then it is based on open-circuit voltage OCVoTo SOCm2Education just, exports SOCf
3. power battery electricity SOC modification method as claimed in claim 1 or 2, which is characterized in that the electricity based on open-circuit voltage Modification method specifically comprises the following steps:
When S1, battery management system initialization, current electric quantity SOC is read1
S2, it is based on open-circuit voltage OCVoSearch corresponding electricity SOC2
S3, judge SOC1Whether SOC is greater thanThreshold value 1
If S4, testing result be then follow the steps S5, if testing result be it is no, then follow the steps S6;
S5, detection electricity SOC1With electricity SOC2Difference whether be greater than SOCThreshold value 2If testing result be it is yes, by electricity SOC1It repairs It is just electricity SOC2If testing result is no, not to electricity SOC1It is modified;
S6, detection electricity SOC1Whether SOC is greater than2If testing result be it is no, then follow the steps S7, if testing result be it is yes, Execute step S8;
S7, detection electricity SOC1Whether SOC is less thanThreshold value 5, and electricity SOC2Whether SOC is greater thanThreshold value 4If testing result is yes, general Electricity SOC1It is modified to electricity SOC2If testing result is no, not to electricity SOC1It is modified;
S8, detection electricity SOC1With electricity SOC2Difference whether be less than SOCThreshold value 3If testing result be it is yes, by electricity SOC1It repairs It is just electricity (SOC2+SOC1)/2, if testing result be it is no, by electricity SOC1It is modified to electricity SOC2
4. power battery electricity SOC modification method as claimed in claim 3, which is characterized in that upon step s 2 further include:
S9, detection current electric quantity SOC1Read whether successfully read, if testing result be it is no, current electric quantity is modified to electricity SOC2If testing result be it is yes, then follow the steps S3.
5. power battery electricity SOC modification method as claimed in claim 1 or 2, which is characterized in that the electricity based on active volume Modification method specifically comprises the following steps:
When S21, battery management system initialization, active volume Q is readko, while acquiring voltage, temperature and the electricity of power battery Stream, and it is uploaded to battery control system BCU;
S22, the current charge and discharge mode of vehicle is read, comprising: fast charge mode, trickle charge mode and discharge mode;
S23, under current charge and discharge mode, determine current voltage, temperature and the corresponding available power Q of electric currentk1
S24, by active volume QkoIt is modified to available power Qk1, and it is based on available power Qk1Correct current electric quantity.
6. power battery electricity SOC modification method as claimed in claim 1 or 2, which is characterized in that the electricity based on residual capacity Amendment stream method specifically comprises the following steps:
When S31, battery management system initialization, residual capacity Q is readso
S32, current remaining capacity value Q is calculated based on the current charge value of power battery and active volume values1
S33, verification remaining capacity value Qs1Whether with residual capacity QsoIt is equal;
If S34, check results be it is yes, export residual capacity QsoIf inspection result be it is no, by residual capacity QsoIt is modified to residue Capacity Qs1
7. power battery electricity SOC modification method as claimed in claim 1 or 2, which is characterized in that the electricity based on cycle life Modification method specifically comprises the following steps:
When S41, battery management system initialization, current electric quantity SOC is read3And cycle life SOHo
S42, it is based on current electric quantity SOC3Calculate current cycle life SOH1
S43, judge cycle life SOHoWith cycle life SOH1Difference whether be less than SOHThreshold value
S44, if it is determined that result be it is yes, by SOH1*SOC3It is assigned to SOC3, if it is determined that result be it is no, then not to current electric quantity SOC3 It is modified.
CN201910372060.9A 2019-05-06 2019-05-06 Power battery electric quantity SOC correction method Active CN110058177B (en)

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陈满: "锂电池健康状态监测与评价技术研究", 《水电站机电技术》 *

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