CN110376527A - A kind of evaluation method and electric car of power battery health status SOH - Google Patents
A kind of evaluation method and electric car of power battery health status SOH Download PDFInfo
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- CN110376527A CN110376527A CN201910625259.8A CN201910625259A CN110376527A CN 110376527 A CN110376527 A CN 110376527A CN 201910625259 A CN201910625259 A CN 201910625259A CN 110376527 A CN110376527 A CN 110376527A
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- power battery
- health status
- status soh
- evaluation method
- power
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The present invention provides the evaluation method and electric car of a kind of power battery health status SOH, the active volume Q ' that the evaluation method of power battery health status SOH passes through calculating current power battery0With active volume Q when factory0Percentage, using this percentage as the power battery current state under health status SOH；Accumulation electricity in active volume and charge and discharge process when being dispatched from the factory using power battery estimates power battery health status SOH, more the remaining life of accurate response power battery；For in terms of estimate parameter measurement precision, the measurement error of the accumulation electricity in active volume and charge and discharge process when factory, the evaluation method relative to existing power battery health status SOH is smaller；The real-time online estimation of vehicle mounted dynamic battery health status SOH may be implemented, and precision is high, the health status SOH of accurate, the actual reaction power battery of energy.
Description
Technical field
The invention belongs to electric vehicle engineering fields, and in particular to a kind of evaluation method of power battery health status SOH
And electric car.
Background technique
To reduce dependence and environmental pollution to petroleum, national and local governments put into effect subsidy policy power-assisted new-energy automobile
Development.Electric car is swift and violent as main force's development of new-energy automobile；Important breakthrough is not obtained in current driving force battery technology
Background under, restrict the service life that universal one of the biggest factor of electric car is exactly power battery；Due to groups of single battery
Performance have differences, charge and discharge electro-temperature, self-discharge rate and the use environment of itself be not also identical, leads to the service life of battery pack
It can decline to a great extent, i.e. the decaying of health status SOH；The health status SOH of power battery characterizes the access times with battery
Increase, the gradually decaying of actual capacity；The definition of generally accepted power battery health status SOH is in standard conditions
Under, it is specified when power battery is dispatched from the factory with the capacity that certain multiplying power discharging to blanking voltage is released with new battery from full state
The ratio of capacity.
It is bent that method, internal resistance method, AC impedence method, voltage are mainly defined to the estimation of power battery health status SOH at present
Collimation method and modelling etc..Definition method is easy to operate for the SOH of single battery assessment, and precision is higher, it can be achieved that online survey
Examination；But on-vehicle battery group SOH assessment is not suitable for, it fills to put entirely entirely repeatedly and will cause battery performance declining to a certain extent
Subtract；Internal resistance method realizes the online evaluation of power battery health status, but this method realizes that condition is not easy to meet, and does not require nothing more than
The high-precision control of some model parameters, and to ignore the influence of one of or several parameters, it will cause estimation error；It hands over
Inside battery each component impedance can be obtained in flow impedance test, and the battery information obtained compared with other methods is more fully, and current
The research of AC impedance spectrometry assessment SOH is not mature enough, and not only needs mass data acquisition with analysis to obtain battery behavior,
And it is higher to instrument requirements, therefore this method is not suitable for on-vehicle battery and Online Judge at present；Voltage curve method need to be to a large amount of
Battery carries out charge-discharge test, takes a long time, and does not meet On-line Estimation requirement；In addition, battery capacity by charge and discharge rule and
The influence of initial conditions etc., there are uncertain factors for analysis result；Modelling simultaneously makees multiple battery aging influence factor
For input, the comprehensive function that many kinds of parameters decays to battery capacity is realized, estimation precision is relatively high, but is mainly limited to reality
Test room assessment；Although circuit model realizes the SOH on-line prediction of on-vehicle battery, precision of prediction is not high.
Summary of the invention
The purpose of the present invention is shortcomings present in view of the above technology, propose a kind of power battery health status
The evaluation method and electric car of SOH, it is intended to solve the problems, such as that the SOH on-line prediction precision of above-mentioned on-vehicle battery is not high.
The present invention provides the evaluation method of power battery health status SOH a kind of, comprising the following steps:
Test the active volume Q of power battery when leaving the factory0, the power battery of test is stood, then to power electric
Pond is discharged, and discharge capacity Q total in discharge process is recorded01；
It repeats the above steps, to record discharge capacity Q02And Q03, and pass through the discharge capacity Q of record01、Q02And Q03To estimate
Active volume Q when factory0, active volume Q0Are as follows: Q0=1/3 (Q01+Q02+Q03)；
Detect the present available capacity Q ' of power battery0, when being filled with electricity Q+With releasing electricity Q-The sum of reach 100%
When battery remaining power SOC, be up to 100% power battery residual capacity is filled with electricity Q+With releasing electricity Q-The sum of make
For present available capacity Q '01, i.e. present available capacity Q '01Are as follows: Q '01=Q++Q-；
It repeats the above steps, to record present available capacity Q '02、Q′03, and pass through the present available capacity Q ' of record01、
Q′02、Q′03To estimate present available capacity Q '0, present available capacity Q '0Are as follows: Q '0=1/3 (Q '01+Q′02+Q′03)；
Calculate the present available capacity Q ' of power battery0With active volume Q when factory0Percentage, and with the percentage
As the health status SOH under power battery current state.
Further, active volume Q of the power battery when testing factory0Time of repose is greater than 30min afterwards.
Further, power battery is discharged to zero power with the discharge capacity of 1C.
Further, the charge and discharge maximum temperature of power battery is less than 30 DEG C.
Further, discharge capacity Q01、Q02And Q03With active volume Q0Deviation be respectively less than 2%；Present available capacity
Q′01、Q′02And Q '03With present available capacity Q '0Deviation be respectively less than 2%.
Further, power battery checks present available capacity Q ' by battery management system0, power battery passes through battery
Management system calculates present available capacity Q '0With active volume Q when factory0Percentage, using as current power battery health
State SOH.
Further, present available capacity Q '0It is through battery management system after power battery entrucking, real-time statistics exist
Electricity Q is filled in charging process+With the releasing electricity Q in discharge process-。
Further, it is filled with electricity Q+Battery remaining power SOC not less than 0% releases electricity Q-No more than 100%
Battery remaining power SOC.
Correspondingly, in conjunction with above scheme, the present invention also provides a kind of electric cars, including power battery health status SOH
Evaluation method, the evaluation method of the power battery health status SOH is estimating for power battery health status SOH described above
Calculation method.
Using above-mentioned technical method, have the advantages that
By the active volume Q ' for calculating current power battery0With active volume Q when factory0Percentage, and with this hundred
Divide ratio as the health status SOH under the power battery current state；Active volume and charge and discharge when being dispatched from the factory using power battery
Accumulation electricity in electric process estimates power battery health status SOH, more the remaining longevity of accurate response power battery
Life；The measurement error of accumulation electricity in active volume and charge and discharge process when factory, relative to existing power battery health
The evaluation method of state SOH is smaller；The real-time online estimation of vehicle mounted dynamic battery health status SOH can be achieved, precision is high, can be quasi-
Really, the health status SOH of actual reaction power battery, effectively improves the product competitiveness of electric car.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Below with reference to attached drawing, the invention will be further described:
Fig. 1 is a kind of evaluation method side view of power battery health status SOH of the present invention；
Fig. 2 is a kind of evaluation method top view of power battery health status SOH of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is to Fig. 2 shows the evaluation methods of power battery health status SOH a kind of, comprising the following steps:
Test the active volume Q of power battery when leaving the factory0, the power battery of test is stood, then to power electric
Pond is discharged, until being discharged to electric discharge cut-off, and records discharge capacity Q total in discharge process01, wherein active volume Q0For
The active volume of power battery after standard charging to full electricity, i.e., active volume when power battery dispatches from the factory；
It repeats the above steps, to re-record the discharge capacity Q of power battery twice02And Q03, to combine the discharge capacity of record
Q01、Q02And Q03To estimate active volume Q when factory0, then active volume Q is calculated0Formula are as follows: Q0=1/3 (Q01+Q02+
Q03)；It should be noted that active volume refers to power battery under prescribed conditions, the electricity that can be released when fully charged,
And the charging and discharging process of power battery can all influence the service life of power battery；
Detect the present available capacity Q ' of power battery0, when being filled with electricity Q+With releasing electricity Q-The sum of reach 100%
When battery remaining power SOC (State of charge), the state-of-charge SOC of power battery is in certain battery use environment
It is down remaining battery active volume Q and battery present available capacity Q '0Ratio, be up to 100% power battery residue hold
Amount is filled with electricity Q+With releasing electricity Q-The sum of be used as present available capacity Q '01, i.e. calculating present available capacity Q '01Formula
Are as follows: Q '01=Q++Q-；
It repeats the above steps, to re-record the present available capacity Q ' of power battery twice02、Q′03, to combine record
Present available capacity Q '01、Q′02、Q′03To estimate present available capacity Q '0, then present available capacity Q ' is calculated0Formula are as follows:
Q′0=1/3 (Q '01+Q′02+Q′03)；Using the electricity for being filled with power battery and releasing power battery in charging process and discharge process
Amount more can really reflect the available of power battery under current state to characterize the active volume of power battery under current state
Capacity；
Calculate the present available capacity Q ' of power battery0With active volume Q when factory0Percentage, and with the percentage
As the health status SOH (state of health) under power battery current state；Due to power battery health status
SOH is estimated that estimation precision is by reflecting the estimation parameter for the amount of being estimated and estimating that the measurement accuracy of parameter determines, estimation ginseng
Number, which should actually, accurately react, is estimated parameter, and guarantees its measurement accuracy；Therefore in terms of estimate parameter selection for, adopt
Accumulation electricity in active volume and charge and discharge process when being dispatched from the factory with power battery estimates power battery health status SOH
Calculate more can accurate response power battery remaining life；It is available when factory and in terms of estimate parameter measurement precision
Evaluation method of the measurement error of accumulation electricity in capacity and charge and discharge process relative to existing power battery health status SOH
It is smaller；
By using above-mentioned technical method, by the active volume Q ' for calculating current power battery0With can be used when factory
Capacity Q0Percentage, and using the percentage as the power battery current state under health status SOH；Using power battery
Accumulation electricity in active volume and charge and discharge process when factory estimates power battery health status SOH, more quasi-
The remaining life of true reaction power battery；The measurement error of accumulation electricity in active volume and charge and discharge process when factory,
Evaluation method relative to existing power battery health status SOH is smaller；The reality of vehicle mounted dynamic battery health status SOH can be achieved
When estimation on line, precision is high, can accurate, actual reaction power battery health status SOH, effectively improve the production of electric car
Product competitiveness.
Preferably, in conjunction with above scheme, as shown in Figure 1 to Figure 2, in the present embodiment, power battery is being tested when dispatching from the factory
Active volume Q0Time of repose is greater than 30min afterwards；Further, power battery is discharged to zero power with the discharge capacity of 1C；Into one
Step ground, the charge and discharge maximum temperature of power battery is less than 30 DEG C, to ensure the testing precision of power battery.
Preferably, in conjunction with above scheme, as shown in Figure 1 to Figure 2, in the present embodiment, discharge capacity Q01、Q02And Q03With can
With capacity Q0Deviation be respectively less than 2%；Present available capacity Q '01、Q′02And Q '03With present available capacity Q '0Deviation it is small
In 2%, by limitation deviation to improve estimation precision, the health status SOH of accurate, the actual reaction power battery of energy.
Preferably, in conjunction with above scheme, as shown in Figure 1 to Figure 2, in the present embodiment, power battery passes through battery management system
System checks present available capacity Q '0, power battery pass through battery management system calculate present available capacity Q '0With factory when can
With capacity Q0Percentage, using as current power cell health state SOH；It is calculated by battery management system BMS current dynamic
The active volume Q ' of power battery0With active volume Q when factory0Percentage, effectively combine battery management system BMS to obtain
More accurate power battery health status SOH, also, evaluation method operation difficulty is small, it is simple to realize, without in existing equipment
On the basis of increase hardware facility, software strategy need to only be adjusted, precision is high, can accurate, actual reaction power
The health status SOH of battery.
Preferably, in conjunction with above scheme, as shown in Figure 1 to Figure 2, in the present embodiment, present available capacity Q '0It is to pass through electricity
Pond management system BMS after power battery entrucking, real-time statistics during the charging process be filled with electricity Q+Putting in discharge process
Electricity Q out-, with more rapid to being filled with electricity Q+With releasing electricity Q-It is counted, to accurately calculate the current of power battery
Active volume Q '0。
Preferably, in conjunction with above scheme, as shown in Figure 1 to Figure 2, in the present embodiment, it is filled with electricity Q+Electricity not less than 0%
Pond residual capacity SOC releases electricity Q-Battery remaining power SOC no more than 100%.
Correspondingly, in conjunction with above scheme, the present invention also provides a kind of electric cars, including power battery health status SOH
Evaluation method, the evaluation method of the power battery health status SOH is estimating for power battery health status SOH described above
Calculation method；By the evaluation method of power battery health status SOH, user can be facilitated to grasp the health of current power battery in real time
State SOH is conducive to daily maintenance and maintenance of the user to power battery, mentions to understand the remaining life of power battery in real time
The usage experience sense of high user.
As shown in Fig. 2, electric car can by battery management system BMS calculating current power battery in the present embodiment
With capacity Q '0With active volume Q when factory0Percentage, and using the percentage as power battery current state under health
State SOH；Firstly, battery management system BMS statistics power battery is filled with electricity Q+With releasing electricity Q-, then judgement is filled with
Electricity Q+With releasing electricity Q-The sum of whether meet the SOC of 100% remaining battery capacity, when being unsatisfactory for, battery management system
System BMS jumps back to previous step to being filled with electricity Q+With releasing electricity Q-The sum of rejudged；When meeting, battery management system
BMS calculates separately present available capacity Q '01、Q′02、Q′03=Q++Q-, to calculate present available capacity Q '01、Q′02And Q
′03, judge present available capacity Q '01、Q′02And Q '03With power battery present available capacity Q '0Whether deviation is respectively less than 2%,
When being unsatisfactory for, battery management system BMS jumps back to previous step to present available capacity Q '01、Q′02And Q '03With power battery
Present available capacity Q '0Deviation is rejudged；When meeting, battery management system BMS passes through calculation formula Q '0=1/3
(Q′01+Q′02+Q′03) calculate the present available capacity Q ' of power battery0；Finally, cell management system of electric automobile BMS is counted
Calculate the active volume Q ' of current power battery0With active volume Q when factory0Percentage as the power battery current state
Under health status SOH；Wherein, Q0The active volume of power battery when to dispatch from the factory；By using above-mentioned technical proposal, precision
Height, accuracy is strong, more can accurate response power battery remaining life；And in terms of estimate parameter measurement precision, out
The measurement error of accumulation electricity in active volume and charge and discharge process when factory is relative to existing power battery health status SOH
Evaluation method it is smaller.
Using the above scheme, pass through the active volume Q ' of calculating current power battery0With active volume Q when factory0Hundred
Point ratio, and using the percentage as the power battery current state under health status SOH；When being dispatched from the factory using power battery can
Power battery health status SOH is estimated with the accumulation electricity in capacity and charge and discharge process, more accurate response power
The remaining life of battery；The measurement error of accumulation electricity in active volume and charge and discharge process when factory, relative to existing
The evaluation method of power battery health status SOH is smaller；The real-time online that vehicle mounted dynamic battery health status SOH can be achieved is estimated
It calculates, precision is high, and the health status SOH of accurate, the actual reaction power battery of energy effectively improves the product competition of electric car
Power.
The above, only presently preferred embodiments of the present invention not do limitation in any form to the present invention.It is any ripe
Those skilled in the art is known, without departing from the scope of the technical proposal of the invention, all using technology contents described above
Many possible changes and modifications or equivalent example modified to equivalent change are made to technical solution of the present invention.Therefore, all
It is the content without departing from technical solution of the present invention, any change made to the above embodiment of technology according to the present invention is repaired.
Claims (9)
1. a kind of evaluation method of power battery health status SOH, which comprises the following steps:
S1: the active volume Q of test power battery when leaving the factory0, the power battery of test is stood, then to described
Power battery discharges, and records discharge capacity Q total in discharge process01。
S2: the step of repeating S1, to record discharge capacity Q02And Q03, and pass through the discharge capacity Q of record01、Q02And Q03To estimate
Calculate active volume Q when factory0, the active volume Q0Are as follows: Q0=1/3 (Q01+Q02+Q03)；
S3: the present available capacity Q ' of the power battery is detected0, when being filled with electricity Q+With releasing electricity Q_The sum of reach 100%
Battery remaining power SOC when, be up to the 100% power battery residual capacity is filled with electricity Q+With releasing electricity Q_
The sum of be used as the present available capacity Q '01, i.e., the described present available capacity Q '01Are as follows: Q '01=Q++Q-；
S4: the step of repeating S3, to record present available capacity Q '02、Q′03, and pass through the present available capacity of record
Q′01、Q′02、Q′03To estimate the present available capacity Q '0, the present available capacity Q '0Are as follows: Q '0=1/3 (Q '01+Q′02+
Q′03)；
S5: the present available capacity Q ' of the power battery is calculated0With active volume Q when factory0Percentage,
And using the percentage as the power battery current state under health status SOH.
2. the evaluation method of power battery health status SOH according to claim 1, which is characterized in that the power electric
The active volume Q of the pond when testing factory0Time of repose is greater than 30min afterwards.
3. the evaluation method of power battery health status SOH according to claim 2, which is characterized in that the power electric
Pond is discharged to zero power with the discharge capacity of 1C.
4. the evaluation method of power battery health status SOH according to claim 2, which is characterized in that the power electric
The charge and discharge maximum temperature in pond is less than 30 DEG C.
5. the evaluation method of power battery health status SOH according to claim 1, which is characterized in that the discharge capacity
Q01、Q02And Q03With the active volume Q0Deviation be respectively less than 2%；The present available capacity Q '01、Q′02And Q '03With
The present available capacity Q '0Deviation be respectively less than 2%.
6. the evaluation method of power battery health status SOH according to claim 1, which is characterized in that the power electric
Pond checks the present available capacity Q ' by battery management system0, the power battery pass through the battery management system meter
Calculate the present available capacity Q '0With active volume Q when factory0Percentage, using as current power battery health shape
State SOH.
7. the evaluation method of power battery health status SOH according to claim 6, which is characterized in that described currently
With capacity Q '0It is the institute of real-time statistics during the charging process through the battery management system after the power battery entrucking
It states and is filled with electricity Q+With the releasing electricity Q in discharge process-。
8. the evaluation method of power battery health status SOH according to claim 7, which is characterized in that described to be filled with electricity
Measure Q+Battery remaining power SOC, the releasing electricity Q not less than 0%_Battery remaining power SOC no more than 100%.
9. a kind of electric car, the evaluation method including power battery health status SOH, which is characterized in that the power battery
The evaluation method of health status SOH is the estimation of the described in any item power battery health status SOH of the claims 1 to 8
Method.
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| Publication number | Publication date |
|---|---|
| CN110376527B (en) | 2021-10-01 |
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