CN110398698A - A kind of method of battery management system SOH estimation - Google Patents

A kind of method of battery management system SOH estimation Download PDF

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CN110398698A
CN110398698A CN201910691929.6A CN201910691929A CN110398698A CN 110398698 A CN110398698 A CN 110398698A CN 201910691929 A CN201910691929 A CN 201910691929A CN 110398698 A CN110398698 A CN 110398698A
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voltage
soh
time
value
current
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CN110398698B (en
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林少青
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Huizhou Keda Star Technology Co Ltd
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Huizhou Keda Star 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
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current 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
    • 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]
    • G01R31/396Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

The invention discloses a kind of methods of battery management system SOH estimation, comprising the following steps: S1:BMS is powered on;S2: monomer voltage current acquisition;S3: numerical value calculates;S4: threshold check;S5:RO is calculated;S6: acquisition comparison;S7:SOH valuation.The present invention takes median estimation on line RO (V by acquiring multi-group datax, Tx) referred to, without doing a large amount of calibration experiments before measurement, workload when estimation is reduced, and by the synchronous acquisition of voltage and current, the fluctuation situation of voltage and current in a period of time can be clearly observed, judge the health status of battery.

Description

A kind of method of battery management system SOH estimation
Technical field
The present invention relates to a kind of methods that field of batteries more particularly to battery management system SOH are estimated.
Background technique
Battery management system is the system being managed to battery, usually have the function of measurement cell voltage, prevent or The unusual conditions such as battery over-discharge, overcharge, excess temperature are avoided to occur, management object is usually the secondary electricity that can be charged again Pond.
Existing battery management system estimates that it needs largely to be tried in advance based on the internal resistance of cell for the estimation of SOH It tests and is demarcated, obtain the battery initial internal resistance at different SOC, and under different charge and discharge operating conditions, voltage and current acquisition It cannot synchronize, cause calculated distortion.
Summary of the invention
The purpose of the present invention is to solve disadvantages existing in the prior art, and a kind of battery management system proposed The method of SOH estimation.
To achieve the goals above, present invention employs following technical solutions:
A kind of method of battery management system SOH estimation, comprising the following steps:
S1:BMS is powered on;BMS obtains power-on time after powering on, then acquire the open-circuit voltage V of battery0If this is powered on Time and last time power-on time meet interval T, then satisfy the requirements one, if open-circuit voltage at this time or open-circuit voltage close on voltage It is not recorded, then satisfies the requirements two;
S2: monomer voltage current acquisition;Consistently online acquires the monomer voltage and electric current of battery, by the voltage and electricity of acquisition Stream storage backup is V1、V2…VnAnd I1、I2…In, the corresponding time is t1、t2…tn, wherein sampling time interval perseverance is t, As n=9, optimal value is obtained, estimation result is more accurate, in t1Moment records V1And I1, in t2Moment records V2And I2, in tn Moment records VnAnd In, by the t of recordn、VnAnd InIt is divided into one group of group record backup, i.e. t1、V1、I1One group, t2、V2、I2One Group ... tn、Vn、InOne group, it is convenient for subsequent step quick calling;
S3: numerical value calculates;Evaluation I2-I1, I3-I2…In-I(n-1), (I1+I2+…+In) t and record intermediate threshold voltage V(n+1)/2With electric current I(n+1)/2If (I1+I2+…+In) t > 0.01C, then it abandons calculating;
S4: threshold check;All I in comparison step S3n-I(n-1)With IaSize, if all In-I(n-1)<Ia, then it represents that t1~tnElectric current is stablized in time, voltage stabilization.
S5:RO is calculated;According to formula RO (Vx, Tx)=(V0-V(n+1)/2)/I(n+1)/2Calculate RO value, then record RO value, The temperature value T of battery packxAnd monomer voltage Vx, condition one and condition two need to be met when calculating RO value;
S6: acquisition comparison;BMS acquires open-circuit voltage after powering on, then the temperature T and monomer voltage of online acquisition battery pack V, if the numerical value of temperature T is close to temperature Tx, the numerical value of monomer voltage V is close to Vx, then according to voltage and current Synchronos method calculate R (V, T)=(V0-V(n+1)/2)/I(n+1)/2, SOH (Vx, Tx)=RO (Vx, Tx)/R (V, T).
S7:SOH valuation;Different VxAnd TxDifferent SOH can be calculated, take multiple groups SOH calculate average value as finally SOH estimated value.
Preferably, in step s3, (I1+I2+…+In) t be tnThe discharge capacity of battery pack in time, if discharge capacity Greater than 0.01C (this is preferred value, can also choose other and limit numerical value), then without I2-I1, I3-I2…In-I(n-1)Calculating, RO etc. stays in next power up cycle and is calculated.
Preferably, in step s 4, threshold value IaFor preset value, i.e. tn-1To tnThe current differential I of timen-I(n-1)Always it protects It holds and is being less than threshold value Ia, then it is assumed that current fluctuation is smaller, and voltage, electric current are more stable.
The invention has the following advantages:
1, it does not need to do a large amount of calibration experiment to battery before measurement to obtain the internal resistance of battery, by acquiring multiple groups Median estimation on line one initial RO (V of datax, Tx) referred to, the step of system measures battery is reduced, it can It is quickly obtained desirable value.
2, acquisition is synchronized to voltage and current, t successively acquires voltage and current at regular intervals, obtains Value of one group of voltage and current about time change, the size according to the transformation degree of voltage and current in each time interval are It can be appreciated that the fluctuation situation of voltage and current.
In conclusion the present invention takes median estimation on line RO (V by acquiring multi-group datax, Tx) referred to, it is not necessarily to A large amount of calibration experiments are done before measurement, reduce workload when estimation, and by the synchronous acquisition of voltage and current, it can be clear The fluctuation situation for observing voltage and current in a period of time, judges the health status of battery.
Detailed description of the invention
Fig. 1 is a kind of step block diagram of the method for battery management system SOH estimation proposed by the present invention;
Fig. 2 is a kind of program flow diagram of the method for battery management system SOH estimation proposed by the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Embodiment one:
Referring to Fig.1-2: a kind of method of battery management system SOH estimation, comprising the following steps:
S1:BMS is powered on;BMS obtains power-on time after powering on, then acquire the open-circuit voltage V of battery0If this is powered on Time and last time power-on time meet interval T, then satisfy the requirements one, if open-circuit voltage at this time or open-circuit voltage close on voltage It is not recorded, then satisfies the requirements two.
S2: monomer voltage current acquisition;Consistently online acquires the monomer voltage and electric current of battery, by the voltage and electricity of acquisition Stream storage backup is V1、V2…VnAnd I1、I2…In, the corresponding time is t1、t2…tn, wherein sampling time interval perseverance is t, As n=9, optimal value is obtained, estimation result is more accurate, in t1Moment records V1And I1, in t2Moment records V2And I2, in tn Moment records VnAnd In, by the t of recordn、VnAnd InIt is divided into one group of group record backup, i.e. t1、V1、I1One group, t2、V2、I2One Group ... tn、Vn、InOne group, it is convenient for subsequent step quick calling.
S3: numerical value calculates;Evaluation I2-I1, I3-I2…In-I(n-1), (I1+I2+…+In) t and record intermediate threshold voltage V(n+1)/2With electric current I(n+1)/2If (I1+I2+…+In) t > 0.01C, then it abandons calculating, (I1+I2+…+In) t be tnIt is electric in time The discharge capacity of Chi Bao, if discharge capacity is greater than 0.01C, without I2-I1, I3-I2…In-I(n-1)Calculating, RO etc. stays in Next power up cycle is calculated.
S4: threshold check;All I in comparison step S3n-I(n-1)With IaSize, if all In-I(n-1)< Ia, then it represents that t1~tnElectric current is stablized in time, voltage stabilization, threshold value IaFor preset value, i.e. tn-1To tnThe current differential I of timen-I(n-1)Begin It is maintained at eventually less than threshold value Ia, then it is assumed that current fluctuation is smaller, and voltage, electric current are more stable.
S5:RO is calculated;According to formula RO (Vx, Tx)=(V0-V(n+1)/2)/I(n+1)/2Calculate RO value, then record RO value, The temperature value T of battery packxAnd monomer voltage Vx, condition one and condition two need to be met when calculating RO value.
S6: acquisition comparison;After BMS is powered on, open-circuit voltage V is acquired0, the then temperature T and monomer of online acquisition battery pack Voltage V, if the numerical value of temperature T is close to temperature Tx, the numerical value of monomer voltage V is close to Vx, then calculated according to voltage and current Synchronos method R (V, T)=(V0-V(n+1)/2)/I(n+1)/2, SOH (Vx, Tx)=RO (Vx, Tx)/R (V, T), if this powers on accumulative electric discharge Capacity does not obtain stable electric current in the time greater than 0.01C, then abandons this acquisition comparison.
S7:SOH valuation;Different VxAnd TxDifferent SOH can be calculated, take multiple groups SOH calculate average value as finally SOH estimated value.
When the present embodiment is in use:
1, BMS is powered on;BMS obtains power-on time after powering on, the open-circuit voltage backup for then acquiring battery is V0=12V, If this power-on time and last time power-on time meet interval T, one is satisfied the requirements, if open-circuit voltage or open-circuit voltage at this time The voltage that closes on be not recorded, then satisfy the requirements two.
2, monomer voltage current acquisition;Consistently online acquires the monomer voltage and electric current of battery, by the voltage and electricity of acquisition Stream storage backup is V1=10V, V2=11V, V3=10.5V, V4=10V, V5=10V, V6=11V, V7=10V, V8=11V, V9 =12V and I1=10mA, I2=11mA, I3=12mA, I4=10mA, I5=10mA, I6=12mA, I7=10mA, I8=10mA, I9=11mA, corresponding time are t1=0.001s, t2=0.002s, t3=0.003s, t4=0.004s, t5=0.005s, t6=0.006s, t7=0.007s, t8=0.008s, t9=0.009s, wherein sampling time interval perseverance is t=0.001s, that is, is existed t1Moment records V1And I1, in t2Moment records V2And I2, in tnMoment records VnAnd In, by the t of record1、V1、I1One group, t2、V2、 I2One group ... t9、V9、I9One group, it is convenient for subsequent step quick calling.
3, numerical value calculates;Evaluation I2-I1, I3-I2…In-I(n-1), (I1+I2+…+In) t and record intermediate threshold voltage V(n+1)/2With electric current I(n+1)/2If (I1+I2+…+In) t > 0.01C, then it abandons calculating, I2-I1=1mA, I3-I2=1mA, I4-I3 =-2mA, I5-I4=0mA, I6-I5=2mA, I7-I6=-2mA, I8-I7=0mA, I9-I8=1mA, (I1+I2+I3+I4+I5+I6+ I7+I8+I9) t=(10+11+12+10+10+12+10+10+11) mA × 0.001s=0.096mAs, 0.096mAs=0.0096C < 0.01C, recording voltage V(n+1)/2=V5=10V and electric current I(n+1)/2=I5=10mA.
4, threshold check;All I in comparison step S3n-I(n-1)With IaSize, if all In-I(n-1)<Ia, then it represents that t1 ~tnElectric current is stablized in time, voltage stabilization, sets Ia=4mA is respectively less than 4mA through more all differences, then t1~t9Time Interior, voltage stabilization, electric current are stablized.
5, RO is calculated;According to formula RO (Vx, Tx)=(V0-V(n+1)/2)/I(n+1)/2Calculate RO value, then record RO value, The temperature value T of battery packxAnd monomer voltage Vx, RO (Vx, Tx)=(V0-V(n+1)/2)/I(n+1)/2=(12V-10V)/10mA= 200 Ω record temperature value T at this timex=24 DEG C, monomer voltage Vx=12V.
6, acquisition comparison;BMS acquires T=25 DEG C of the temperature and monomer voltage V of battery pack after powering on0=12V, temperature T's Numerical value is close to temperature Tx, monomer voltage V0Numerical value close to Vx, R (V, T)=(V is calculated according to voltage and current Synchronos method0- V(n+1)/2)/I(n+1)/2=V5/I5=2V/10mA=200 Ω, SOH (Vx, Tx)=RO (Vx, Tx)/R (V, T)=200 Ω/200 Ω × 100%=100% represents being in a good state of health for battery pack.
Embodiment two:
Referring to Fig.1-2, a kind of method of battery management system SOH estimation, including following implementation steps:
1, BMS is powered on;BMS obtains power-on time after powering on, the open-circuit voltage backup for then acquiring battery is V0=12V, If this power-on time and last time power-on time meet interval T, one is satisfied the requirements, if open-circuit voltage or open-circuit voltage at this time The voltage that closes on be not recorded, then satisfy the requirements two.
2, monomer voltage current acquisition;Consistently online acquires the monomer voltage and electric current of battery, by the voltage and electricity of acquisition Stream storage backup is V1=10V, V2=11V, V3=10.5V, V4=10V, V5=9.5V, V6=11V, V7=10V, V8=11V, V9=12V and I1=10mA, I2=11mA, I3=12mA, I4=10mA, I5=10mA, I6=12mA, I7=10mA, I8= 10mA、I9=11mA, corresponding time are t1=0.001s, t2=0.002s, t3=0.003s, t4=0.004s, t5= 0.005s、t6=0.006s, t7=0.007s, t8=0.008s, t9=0.009s, wherein sampling time interval perseverance is t= 0.001s, i.e., in t1Moment records V1And I1, in t2Moment records V2And I2, in tnMoment records VnAnd In, by the t of record1、V1、 I1One group, t2、V2、I2One group ... t9、V9、I9One group, it is convenient for subsequent step quick calling.
3, numerical value calculates;Evaluation I2-I1, I3-I2…In-I(n-1), (I1+I2+…+In) t and record intermediate threshold voltage V(n+1)/2With electric current I(n+1)/2If (I1+I2+…+In) t > 0.01C, then it abandons calculating, I2-I1=1mA, I3-I2=1mA, I4-I3 =-2mA, I5-I4=0mA, I6-I5=2mA, I7-I6=-2mA, I8-I7=0mA, I9-I8=1mA, (I1+I2+I3+I4+I5+I6+ I7+I8+I9) t=(10+11+12+10+10+12+10+10+11) mA × 0.001s=0.096mAs, 0.096mAs=0.0096C < 0.01C, recording voltage V(n+1)/2=V5=9.5V and electric current I(n+1)/2=I5=10mA.
4, threshold check;All I in comparison step S3n-I(n-1)With IaSize, if all In-I(n-1)<Ia, then it represents that t1 ~tnElectric current is stablized in time, voltage stabilization, sets Ia=4mA is respectively less than 4mA through more all differences, then t1~t9Time Interior, voltage stabilization, electric current are stablized.
5, R is calculated;The collected open-circuit voltage of BMS is V0=12V, temperature are 24 DEG C, this voltage and temperature are remembered It recorded, and directly obtained R0=200 Ω from memory space.
6, acquisition comparison;BMS acquires T=25 DEG C of the temperature and monomer voltage V of battery pack after powering on0=12V, temperature T's Numerical value is close to temperature Tx, monomer voltage V0Numerical value close to Vx, R (V, T)=(V is calculated according to voltage and current Synchronos method0- V(n+1)/2)/I(n+1)/2=(V0-V5)/I5=2.5V/10mA=250 Ω, SOH (Vx, Tx)=RO (Vx, Tx)/R (V, T)=200 Ω/250 Ω × 100%=80%, representing the health degree of battery pack is 80%.
Embodiment three:
Referring to Fig.1-2, a kind of method of battery management system SOH estimation, including following implementation steps:
1, BMS is powered on;BMS obtains power-on time after powering on, the open-circuit voltage backup for then acquiring battery is V0=12V, If this power-on time and last time power-on time meet interval T, one is satisfied the requirements, if open-circuit voltage or open-circuit voltage at this time The voltage that closes on be not recorded, then satisfy the requirements two.
2, monomer voltage current acquisition;Consistently online acquires the monomer voltage and electric current of battery, by the voltage and electricity of acquisition Stream storage backup is V1=10V, V2=11V, V3=10.5V, V4=10V, V5=7V, V6=11V, V7=10V, V8=11V, V9 =12V and I1=10mA, I2=11mA, I3=12mA, I4=10mA, I5=10mA, I6=12mA, I7=10mA, I8=10mA, I9=11mA, corresponding time are t1=0.001s, t2=0.002s, t3=0.003s, t4=0.004s, t5=0.005s, t6=0.006s, t7=0.007s, t8=0.008s, t9=0.009s, wherein sampling time interval perseverance is t=0.001s, that is, is existed t1Moment records V1And I1, in t2Moment records V2And I2, in tnMoment records VnAnd In, by the t of record1、V1、I1One group, t2、V2、 I2One group ... t9、V9、I9One group, it is convenient for subsequent step quick calling.
3, numerical value calculates;Evaluation I2-I1, I3-I2…In-I(n-1), (I1+I2+…+In) t and record intermediate threshold voltage V(n+1)/2With electric current I(n+1)/2If (I1+I2+…+In) t > 0.01C, then it abandons calculating, I2-I1=1mA, I3-I2=1mA, I4-I3 =-2mA, I5-I4=0mA, I6-I5=2mA, I7-I6=-2mA, I8-I7=0mA, I9-I8=1mA, (I1+I2+I3+I4+I5+I6+ I7+I8+I9) t=(10+11+12+10+10+12+10+10+11) mA × 0.001s=0.096mAs, 0.096mAs=0.0096C < 0.01C, recording voltage V(n+1)/2=V5=7V and electric current I(n+1)/2=I5=10mA.
4, threshold check;All I in comparison step S3n-I(n-1)With IaSize, if all In-I(n-1)<Ia, then it represents that t1 ~tnElectric current is stablized in time, voltage stabilization, sets Ia=4mA is respectively less than 4mA through more all differences, then t1~t9Time Interior, voltage stabilization, electric current are stablized.
5, RO is calculated;The collected open-circuit voltage of BMS is 12V, and temperature is 24 DEG C, this voltage and temperature have been recorded It crosses, directly obtains R0=200 Ω from memory space.
6, acquisition comparison;BMS powers on T=25 DEG C of the temperature and monomer open-circuit voltage V of rear online acquisition battery pack0=12V, The numerical value of temperature T is close to temperature Tx, monomer voltage V0Numerical value close to Vx, according to voltage and current Synchronos method calculate R (V, T)= (V0-V(n+1)/2)/I(n+1)/2=V0-V5/I5=(12-7) V/10mA=500 Ω, SOH (Vx, Tx)=RO (Vx, Tx)/R (V, T)= 200 Ω/500 Ω × 100%=40%, the health status for representing battery pack decline more obvious.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.

Claims (3)

1. a kind of method of battery management system SOH estimation, which comprises the following steps:
S1:BMS is powered on;BMS obtains power-on time after powering on, then acquire the open-circuit voltage V of battery0
S2: monomer voltage current acquisition;Consistently online acquires the monomer voltage and electric current of battery, and the voltage and current of acquisition is deposited Deposit part is V1、V2…VnAnd I1、I2…In, the corresponding time is t1、t2…tn, wherein sampling time interval perseverance is t;
S3: numerical value calculates;Evaluation I2-I1, I3-I2…In-I(n-1), (I1+I2+…+In) t and recording voltage V(n+1)/2And electricity Flow I(n+1)/2If (I1+I2+…+In) t > 0.01C, then it abandons calculating;
S4: threshold check;All I in comparison step S3n-I(n-1)With IaSize, if all In-I(n-1)<Ia, then it represents that t1~tn Electric current is stablized in time, voltage stabilization;
S5:RO is calculated;According to formula RO (Vx, Tx)=(V0-V(n+1)/2)/I(n+1)/2RO value is calculated, RO value, battery are then recorded The temperature value T of packetxAnd monomer voltage Vx
S6: acquisition comparison;BMS acquires open-circuit voltage after powering on, then the temperature T and monomer voltage V of online acquisition battery pack, if The numerical value of temperature T is close to temperature Tx, the numerical value of monomer voltage V is close to Vx, then according to voltage and current Synchronos method calculate R (V, T)= (V0-V(n+1)/2)/I(n+1)/2, SOH (Vx, Tx)=RO (Vx, Tx)/R (V, T);
S7:SOH valuation;Different VxAnd TxDifferent SOH can be calculated, the average value for taking multiple groups SOH to calculate is as final SOH Estimated value.
2. a kind of method of battery management system SOH estimation according to claim 1, which is characterized in that in step s3, (I1+I2+…+In) t be tnThe discharge capacity of battery pack in time, if discharge capacity is greater than 0.01C, without I2-I1, I3- I2…In-I(n-1)Calculating, abandon this calculating.
3. a kind of method of battery management system SOH estimation according to claim 2, which is characterized in that in step s 4, Threshold value IaFor preset value, i.e. tn-1To tnThe current differential I of timen-I(n-1)It remains at and is less than threshold value Ia, then it is assumed that current wave Dynamic smaller, voltage, electric current are more stable.
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