CN110398698A  A kind of method of battery management system SOH estimation  Google Patents
A kind of method of battery management system SOH estimation Download PDFInfo
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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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Classifications

 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]
 G01R31/392—Determining battery ageing or deterioration, e.g. state of health

 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]
 G01R31/396—Acquisition 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 multigroup data_{x}, T_{x}) 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
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 overdischarge, 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 poweron time after powering on, then acquire the opencircuit voltage V of battery_{0}If this is powered on
Time and last time poweron time meet interval T, then satisfy the requirements one, if opencircuit voltage at this time or opencircuit 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 V_{1}、V_{2}…V_{n}And I_{1}、I_{2}…I_{n}, the corresponding time is t_{1}、t_{2}…t_{n}, wherein sampling time interval perseverance is t,
As n=9, optimal value is obtained, estimation result is more accurate, in t_{1}Moment records V_{1}And I_{1}, in t_{2}Moment records V_{2}And I_{2}, in t_{n}
Moment records V_{n}And I_{n}, by the t of record_{n}、V_{n}And I_{n}It is divided into one group of group record backup, i.e. t_{1}、V_{1}、I_{1}One group, t_{2}、V_{2}、I_{2}One
Group ... t_{n}、V_{n}、I_{n}One group, it is convenient for subsequent step quick calling；
S3: numerical value calculates；Evaluation I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}, (I_{1}+I_{2}+…+I_{n}) t and record intermediate threshold voltage
V_{(n+1)/2}With electric current I_{(n+1)/2}If (I_{1}+I_{2}+…+I_{n}) t > 0.01C, then it abandons calculating；
S4: threshold check；All I in comparison step S3_{n}I_{(n1)}With I_{a}Size, if all I_{n}I_{(n1)}<I_{a}, then it represents that
t_{1}~t_{n}Electric current is stablized in time, voltage stabilization.
S5:RO is calculated；According to formula RO (V_{x}, T_{x})=(V_{0}V_{(n+1)/2})/I_{(n+1)/2}Calculate RO value, then record RO value,
The temperature value T of battery pack_{x}And monomer voltage V_{x}, condition one and condition two need to be met when calculating RO value；
S6: acquisition comparison；BMS acquires opencircuit 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 T_{x}, the numerical value of monomer voltage V is close to V_{x}, then according to voltage and current Synchronos method calculate R (V,
T)=(V_{0}V_{(n+1)/2})/I_{(n+1)/2}, SOH (V_{x}, T_{x})=RO (V_{x}, T_{x})/R (V, T).
S7:SOH valuation；Different V_{x}And T_{x}Different SOH can be calculated, take multiple groups SOH calculate average value as finally
SOH estimated value.
Preferably, in step s3, (I_{1}+I_{2}+…+I_{n}) t be t_{n}The 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 I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}Calculating,
RO etc. stays in next power up cycle and is calculated.
Preferably, in step s 4, threshold value I_{a}For preset value, i.e. t_{n1}To t_{n}The current differential I of time_{n}I_{(n1)}Always it protects
It holds and is being less than threshold value I_{a}, 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 data_{x}, T_{x}) 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 multigroup data_{x}, T_{x}) 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.12: a kind of method of battery management system SOH estimation, comprising the following steps:
S1:BMS is powered on；BMS obtains poweron time after powering on, then acquire the opencircuit voltage V of battery_{0}If this is powered on
Time and last time poweron time meet interval T, then satisfy the requirements one, if opencircuit voltage at this time or opencircuit 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 V_{1}、V_{2}…V_{n}And I_{1}、I_{2}…I_{n}, the corresponding time is t_{1}、t_{2}…t_{n}, wherein sampling time interval perseverance is t,
As n=9, optimal value is obtained, estimation result is more accurate, in t_{1}Moment records V_{1}And I_{1}, in t_{2}Moment records V_{2}And I_{2}, in tn
Moment records V_{n}And I_{n}, by the t of record_{n}、V_{n}And I_{n}It is divided into one group of group record backup, i.e. t_{1}、V_{1}、I_{1}One group, t_{2}、V_{2}、I_{2}One
Group ... t_{n}、V_{n}、I_{n}One group, it is convenient for subsequent step quick calling.
S3: numerical value calculates；Evaluation I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}, (I_{1}+I_{2}+…+I_{n}) t and record intermediate threshold voltage
V_{(n+1)/2}With electric current I_{(n+1)/2}If (I_{1}+I_{2}+…+I_{n}) t > 0.01C, then it abandons calculating, (I_{1}+I_{2}+…+I_{n}) t be t_{n}It is electric in time
The discharge capacity of Chi Bao, if discharge capacity is greater than 0.01C, without I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}Calculating, RO etc. stays in
Next power up cycle is calculated.
S4: threshold check；All I in comparison step S3_{n}I_{(n1)}With I_{a}Size, if all I_{n}I_{(n1)}< Ia, then it represents that
t_{1}~t_{n}Electric current is stablized in time, voltage stabilization, threshold value I_{a}For preset value, i.e. t_{n1}To t_{n}The current differential I of time_{n}I_{(n1)}Begin
It is maintained at eventually less than threshold value I_{a}, then it is assumed that current fluctuation is smaller, and voltage, electric current are more stable.
S5:RO is calculated；According to formula RO (V_{x}, T_{x})=(V_{0}V_{(n+1)/2})/I_{(n+1)/2}Calculate RO value, then record RO value,
The temperature value T of battery pack_{x}And monomer voltage V_{x}, condition one and condition two need to be met when calculating RO value.
S6: acquisition comparison；After BMS is powered on, opencircuit voltage V is acquired_{0}, the then temperature T and monomer of online acquisition battery pack
Voltage V, if the numerical value of temperature T is close to temperature T_{x}, the numerical value of monomer voltage V is close to V_{x}, then calculated according to voltage and current Synchronos method
R (V, T)=(V_{0}V_{(n+1)/2})/I_{(n+1)/2}, SOH (V_{x}, T_{x})=RO (V_{x}, T_{x})/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 V_{x}And T_{x}Different 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 poweron time after powering on, the opencircuit voltage backup for then acquiring battery is V_{0}=12V,
If this poweron time and last time poweron time meet interval T, one is satisfied the requirements, if opencircuit voltage or opencircuit 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 V_{1}=10V, V_{2}=11V, V_{3}=10.5V, V_{4}=10V, V_{5}=10V, V_{6}=11V, V_{7}=10V, V_{8}=11V, V_{9}
=12V and I_{1}=10mA, I_{2}=11mA, I_{3}=12mA, I_{4}=10mA, I_{5}=10mA, I_{6}=12mA, I_{7}=10mA, I_{8}=10mA,
I_{9}=11mA, corresponding time are t_{1}=0.001s, t_{2}=0.002s, t_{3}=0.003s, t_{4}=0.004s, t_{5}=0.005s,
t_{6}=0.006s, t_{7}=0.007s, t_{8}=0.008s, t_{9}=0.009s, wherein sampling time interval perseverance is t=0.001s, that is, is existed
t_{1}Moment records V_{1}And I_{1}, in t_{2}Moment records V_{2}And I_{2}, in t_{n}Moment records V_{n}And I_{n}, by the t of record_{1}、V_{1}、I_{1}One group, t_{2}、V_{2}、
I_{2}One group ... t_{9}、V_{9}、I_{9}One group, it is convenient for subsequent step quick calling.
3, numerical value calculates；Evaluation I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}, (I_{1}+I_{2}+…+I_{n}) t and record intermediate threshold voltage
V_{(n+1)/2}With electric current I_{(n+1)/2}If (I_{1}+I_{2}+…+I_{n}) t > 0.01C, then it abandons calculating, I_{2}I_{1}=1mA, I_{3}I_{2}=1mA, I_{4}I_{3}
=2mA, I_{5}I_{4}=0mA, I_{6}I_{5}=2mA, I_{7}I_{6}=2mA, I_{8}I_{7}=0mA, I_{9}I_{8}=1mA, (I_{1}+I_{2}+I_{3}+I_{4}+I_{5}+I_{6}+
I_{7}+I_{8}+I_{9}) 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}=V_{5}=10V and electric current I_{(n+1)/2}=I_{5}=10mA.
4, threshold check；All I in comparison step S3_{n}I_{(n1)}With I_{a}Size, if all I_{n}I_{(n1)}<I_{a}, then it represents that t_{1}
~t_{n}Electric current is stablized in time, voltage stabilization, sets I_{a}=4mA is respectively less than 4mA through more all differences, then t_{1}~t_{9}Time
Interior, voltage stabilization, electric current are stablized.
5, RO is calculated；According to formula RO (V_{x}, T_{x})=(V_{0}V_{(n+1)/2})/I_{(n+1)/2}Calculate RO value, then record RO value,
The temperature value T of battery pack_{x}And monomer voltage V_{x}, RO (V_{x}, T_{x})=(V_{0}V_{(n+1)/2})/I_{(n+1)/2}=(12V10V)/10mA=
200 Ω record temperature value T at this time_{x}=24 DEG C, monomer voltage V_{x}=12V.
6, acquisition comparison；BMS acquires T=25 DEG C of the temperature and monomer voltage V of battery pack after powering on_{0}=12V, temperature T's
Numerical value is close to temperature T_{x}, monomer voltage V_{0}Numerical value close to V_{x}, R (V, T)=(V is calculated according to voltage and current Synchronos method_{0}
V_{(n+1)/2})/I_{(n+1)/2}=V_{5}/I_{5}=2V/10mA=200 Ω, SOH (V_{x}, T_{x})=RO (V_{x}, T_{x})/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.12, a kind of method of battery management system SOH estimation, including following implementation steps:
1, BMS is powered on；BMS obtains poweron time after powering on, the opencircuit voltage backup for then acquiring battery is V_{0}=12V,
If this poweron time and last time poweron time meet interval T, one is satisfied the requirements, if opencircuit voltage or opencircuit 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 V_{1}=10V, V_{2}=11V, V_{3}=10.5V, V_{4}=10V, V_{5}=9.5V, V_{6}=11V, V_{7}=10V, V_{8}=11V,
V_{9}=12V and I_{1}=10mA, I_{2}=11mA, I_{3}=12mA, I_{4}=10mA, I_{5}=10mA, I_{6}=12mA, I_{7}=10mA, I_{8}=
10mA、I_{9}=11mA, corresponding time are t_{1}=0.001s, t_{2}=0.002s, t_{3}=0.003s, t_{4}=0.004s, t_{5}=
0.005s、t_{6}=0.006s, t_{7}=0.007s, t_{8}=0.008s, t_{9}=0.009s, wherein sampling time interval perseverance is t=
0.001s, i.e., in t_{1}Moment records V_{1}And I_{1}, in t_{2}Moment records V_{2}And I_{2}, in t_{n}Moment records V_{n}And I_{n}, by the t of record_{1}、V_{1}、
I_{1}One group, t_{2}、V_{2}、I_{2}One group ... t_{9}、V_{9}、I_{9}One group, it is convenient for subsequent step quick calling.
3, numerical value calculates；Evaluation I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}, (I_{1}+I_{2}+…+I_{n}) t and record intermediate threshold voltage
V_{(n+1)/2}With electric current I_{(n+1)/2}If (I_{1}+I_{2}+…+I_{n}) t > 0.01C, then it abandons calculating, I_{2}I_{1}=1mA, I_{3}I_{2}=1mA, I_{4}I_{3}
=2mA, I_{5}I_{4}=0mA, I_{6}I_{5}=2mA, I_{7}I_{6}=2mA, I_{8}I_{7}=0mA, I_{9}I_{8}=1mA, (I_{1}+I_{2}+I_{3}+I_{4}+I_{5}+I_{6}+
I_{7}+I_{8}+I_{9}) 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}=V_{5}=9.5V and electric current I_{(n+1)/2}=I_{5}=10mA.
4, threshold check；All I in comparison step S3_{n}I_{(n1)}With I_{a}Size, if all I_{n}I_{(n1)}<I_{a}, then it represents that t_{1}
~t_{n}Electric current is stablized in time, voltage stabilization, sets I_{a}=4mA is respectively less than 4mA through more all differences, then t_{1}~t_{9}Time
Interior, voltage stabilization, electric current are stablized.
5, R is calculated；The collected opencircuit voltage of BMS is V_{0}=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 on_{0}=12V, temperature T's
Numerical value is close to temperature T_{x}, monomer voltage V_{0}Numerical value close to V_{x}, R (V, T)=(V is calculated according to voltage and current Synchronos method_{0}
V_{(n+1)/2})/I_{(n+1)/2}=(V_{0}V_{5})/I_{5}=2.5V/10mA=250 Ω, SOH (V_{x}, T_{x})=RO (V_{x}, T_{x})/R (V, T)=200
Ω/250 Ω × 100%=80%, representing the health degree of battery pack is 80%.
Embodiment three:
Referring to Fig.12, a kind of method of battery management system SOH estimation, including following implementation steps:
1, BMS is powered on；BMS obtains poweron time after powering on, the opencircuit voltage backup for then acquiring battery is V_{0}=12V,
If this poweron time and last time poweron time meet interval T, one is satisfied the requirements, if opencircuit voltage or opencircuit 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 V_{1}=10V, V_{2}=11V, V_{3}=10.5V, V_{4}=10V, V_{5}=7V, V_{6}=11V, V_{7}=10V, V_{8}=11V, V_{9}
=12V and I_{1}=10mA, I_{2}=11mA, I_{3}=12mA, I_{4}=10mA, I_{5}=10mA, I_{6}=12mA, I_{7}=10mA, I_{8}=10mA,
I_{9}=11mA, corresponding time are t_{1}=0.001s, t_{2}=0.002s, t_{3}=0.003s, t_{4}=0.004s, t_{5}=0.005s,
t_{6}=0.006s, t_{7}=0.007s, t_{8}=0.008s, t_{9}=0.009s, wherein sampling time interval perseverance is t=0.001s, that is, is existed
t_{1}Moment records V_{1}And I_{1}, in t_{2}Moment records V_{2}And I_{2}, in t_{n}Moment records V_{n}And I_{n}, by the t of record_{1}、V_{1}、I_{1}One group, t_{2}、V_{2}、
I_{2}One group ... t_{9}、V_{9}、I_{9}One group, it is convenient for subsequent step quick calling.
3, numerical value calculates；Evaluation I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}, (I_{1}+I_{2}+…+I_{n}) t and record intermediate threshold voltage
V_{(n+1)/2}With electric current I_{(n+1)/2}If (I_{1}+I_{2}+…+I_{n}) t > 0.01C, then it abandons calculating, I_{2}I_{1}=1mA, I_{3}I_{2}=1mA, I_{4}I_{3}
=2mA, I_{5}I_{4}=0mA, I_{6}I_{5}=2mA, I_{7}I_{6}=2mA, I_{8}I_{7}=0mA, I_{9}I_{8}=1mA, (I_{1}+I_{2}+I_{3}+I_{4}+I_{5}+I_{6}+
I_{7}+I_{8}+I_{9}) 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}=V_{5}=7V and electric current I_{(n+1)/2}=I_{5}=10mA.
4, threshold check；All I in comparison step S3_{n}I_{(n1)}With I_{a}Size, if all I_{n}I_{(n1)}<I_{a}, then it represents that t_{1}
~t_{n}Electric current is stablized in time, voltage stabilization, sets I_{a}=4mA is respectively less than 4mA through more all differences, then t_{1}~t_{9}Time
Interior, voltage stabilization, electric current are stablized.
5, RO is calculated；The collected opencircuit 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 opencircuit voltage V of rear online acquisition battery pack_{0}=12V,
The numerical value of temperature T is close to temperature T_{x}, monomer voltage V_{0}Numerical value close to V_{x}, according to voltage and current Synchronos method calculate R (V, T)=
(V_{0}V_{(n+1)/2})/I_{(n+1)/2}=V_{0}V_{5}/I_{5}=(127) V/10mA=500 Ω, SOH (V_{x}, T_{x})=RO (V_{x}, T_{x})/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 poweron time after powering on, then acquire the opencircuit voltage V of battery_{0}；
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 V_{1}、V_{2}…V_{n}And I_{1}、I_{2}…I_{n}, the corresponding time is t_{1}、t_{2}…t_{n}, wherein sampling time interval perseverance is t；
S3: numerical value calculates；Evaluation I_{2}I_{1}, I_{3}I_{2}…I_{n}I_{(n1)}, (I_{1}+I_{2}+…+I_{n}) t and recording voltage V_{(n+1)/2}And electricity
Flow I_{(n+1)/2}If (I_{1}+I_{2}+…+I_{n}) t > 0.01C, then it abandons calculating；
S4: threshold check；All I in comparison step S3_{n}I_{(n1)}With I_{a}Size, if all I_{n}I_{(n1)}<I_{a}, then it represents that t_{1}~t_{n}
Electric current is stablized in time, voltage stabilization；
S5:RO is calculated；According to formula RO (V_{x}, T_{x})=(V_{0}V_{(n+1)/2})/I_{(n+1)/2}RO value is calculated, RO value, battery are then recorded
The temperature value T of packet_{x}And monomer voltage V_{x}；
S6: acquisition comparison；BMS acquires opencircuit 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 T_{x}, the numerical value of monomer voltage V is close to V_{x}, then according to voltage and current Synchronos method calculate R (V, T)=
(V_{0}V_{(n+1)/2})/I_{(n+1)/2}, SOH (V_{x}, T_{x})=RO (V_{x}, T_{x})/R (V, T)；
S7:SOH valuation；Different V_{x}And T_{x}Different 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,
(I_{1}+I_{2}+…+I_{n}) t be t_{n}The discharge capacity of battery pack in time, if discharge capacity is greater than 0.01C, without I_{2}I_{1}, I_{3}
I_{2}…I_{n}I_{(n1)}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 I_{a}For preset value, i.e. t_{n1}To t_{n}The current differential I of time_{n}I_{(n1)}It remains at and is less than threshold value I_{a}, then it is assumed that current wave
Dynamic smaller, voltage, electric current are more stable.
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Citations (11)
Publication number  Priority date  Publication date  Assignee  Title 

CN103698713A (en) *  20131230  20140402  长城汽车股份有限公司  Method for assessing SOH (state of health) of lithium ion battery 
CN104678316A (en) *  20150228  20150603  北京交通大学  Method and device for estimating charge state of lithium ion battery 
US20150276887A1 (en) *  20140401  20151001  Hon Hai Precision Industry Co., Ltd.  Method and apparatus of estimating state of health of battery 
CN105021996A (en) *  20150804  20151104  深圳拓普科新能源科技有限公司  Battery SOH (section of health) estimation method of energy storage power station BMS (battery management system) 
CN105510833A (en) *  20151127  20160420  马发清  Storage battery health status detection method, device and system 
CN105589042A (en) *  20151210  20160518  希姆通信息技术（上海）有限公司  Calculation method for calculating residual electricity quantity of battery 
CN105607010A (en) *  20160202  20160525  北京理工大学  Method for estimating health state of power battery of electric vehicle 
CN105891715A (en) *  20141212  20160824  广西大学  Lithium ion battery health state estimation method 
CN106597308A (en) *  20161216  20170426  西南交通大学  Power cell residual electricity quantity estimation method 
CN109061508A (en) *  20180911  20181221  上海电力学院  A kind of estimation method of electric automobile lithium battery SOH 
CN109878378A (en) *  20190130  20190614  北京长城华冠汽车科技股份有限公司  Internal resistance of cell calculation method, device and battery management system 

2019
 20190730 CN CN201910691929.6A patent/CN110398698B/en active Active
Patent Citations (11)
Publication number  Priority date  Publication date  Assignee  Title 

CN103698713A (en) *  20131230  20140402  长城汽车股份有限公司  Method for assessing SOH (state of health) of lithium ion battery 
US20150276887A1 (en) *  20140401  20151001  Hon Hai Precision Industry Co., Ltd.  Method and apparatus of estimating state of health of battery 
CN105891715A (en) *  20141212  20160824  广西大学  Lithium ion battery health state estimation method 
CN104678316A (en) *  20150228  20150603  北京交通大学  Method and device for estimating charge state of lithium ion battery 
CN105021996A (en) *  20150804  20151104  深圳拓普科新能源科技有限公司  Battery SOH (section of health) estimation method of energy storage power station BMS (battery management system) 
CN105510833A (en) *  20151127  20160420  马发清  Storage battery health status detection method, device and system 
CN105589042A (en) *  20151210  20160518  希姆通信息技术（上海）有限公司  Calculation method for calculating residual electricity quantity of battery 
CN105607010A (en) *  20160202  20160525  北京理工大学  Method for estimating health state of power battery of electric vehicle 
CN106597308A (en) *  20161216  20170426  西南交通大学  Power cell residual electricity quantity estimation method 
CN109061508A (en) *  20180911  20181221  上海电力学院  A kind of estimation method of electric automobile lithium battery SOH 
CN109878378A (en) *  20190130  20190614  北京长城华冠汽车科技股份有限公司  Internal resistance of cell calculation method, device and battery management system 
NonPatent Citations (2)
Title 

XUEYUAN WANG等: "Estimation of state of health of lithiumion batteries based on charge transfer resistance considering different temperature and state of charge", 《JOURNAL OF ENERGY STORAGE》 * 
朱立群等: "一种联合锂电池健康和荷电状态的新模型", 《中国电机工程学报》 * 
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