CN107907834A - Current drift bearing calibration, system and the device of a kind of battery management system - Google Patents
Current drift bearing calibration, system and the device of a kind of battery management system Download PDFInfo
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- 238000000034 method Methods 0.000 claims abstract description 78
- 238000005259 measurement Methods 0.000 claims abstract description 51
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 230000035772 mutation Effects 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 10
- 238000002715 modification method Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000005955 Ferric phosphate Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000000205 computational method Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229940032958 ferric phosphate Drugs 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/32—Compensating for temperature change
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
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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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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Abstract
本发明公开了一种电池管理系统的电流漂移校正方法、系统及装置，方法包括：对电流传感器的测量结果进行温度漂移修正，得到温度漂移修正后的电流；建立电池模型，并计算建立的电池模型与电池实际测量电压的电压残差；根据计算的电压残差计算电流传感器的漂移电流；将温度漂移修正后的电流与电流传感器的漂移电流相加，得到电池管理系统的电流真实值。系统包括温度漂移修正模块、电压残差计算模块、漂移电流计算模块和电流真实值获取模块。装置包括存储器和处理器。本发明通过将温度漂移修正后的电流与漂移电流相加的电流真实值实现了对电流传感器电流的闭环修正，测量误差小、鲁棒性好和兼容性良好，可广泛应用于电池的均衡领域。
The invention discloses a current drift correction method, system and device of a battery management system. The method includes: performing temperature drift correction on the measurement results of a current sensor to obtain the current after temperature drift correction; establishing a battery model and calculating the established battery The voltage residual between the model and the actual measured voltage of the battery; the drift current of the current sensor is calculated according to the calculated voltage residual; the current after temperature drift correction is added to the drift current of the current sensor to obtain the actual current value of the battery management system. The system includes a temperature drift correction module, a voltage residual calculation module, a drift current calculation module and a current actual value acquisition module. The device includes memory and a processor. The present invention realizes the closed-loop correction of the current sensor current by adding the current corrected by the temperature drift to the true current value of the drift current, has small measurement error, good robustness and good compatibility, and can be widely used in the field of battery equalization .
Description
Technical field
The present invention relates to the balanced field of battery, the current drift bearing calibration of especially a kind of battery management system, be
System and device.
Background technology
Due to cost considerations, the current sensor of battery management system actual use is often there are certain drift value,
Precision is not high.When the state to accumulation type measures (during as using Current integrating method estimation battery dump energy), battery
Management system is easy to that the Divergent Phenomenon brought by current sensor drift occurs.For this reason, it is necessary to current sensor is floated
Shifting is corrected, and reduces measurement error.
The method that existing drift correction technology mainly samples open loop carrys out corrective current sensor drift, or in zero current
When to current sensor drift be modified, robustness of this kind of method to different use environments, temperature or sensor model number
Difference, compatibility are bad.
The content of the invention
In order to solve the above technical problems, the first object of the present invention is：There is provided that a kind of measurement error is small, robustness is good and
Compatible good, the current drift bearing calibration of battery management system.
The second object of the present invention is：There is provided that a kind of measurement error is small, robustness is good and compatible good, cell tube
The current drift correction system of reason system.
The third object of the present invention is：There is provided that a kind of measurement error is small, robustness is good and compatible good, cell tube
The current drift means for correcting of reason system.
The first technical solution for being taken of the present invention is：
A kind of current drift bearing calibration of battery management system, comprises the following steps：
Temperature drift amendment is carried out to the measurement result of current sensor, obtains the revised electric current of temperature drift；
Battery model is established, and calculates the voltage residual error of the battery model and the actual measurement voltage of battery of foundation；
According to the drift current of the voltage residual computations current sensor of calculating；
The revised electric current of temperature drift is added with the drift current of current sensor, obtains the electricity of battery management system
Flow actual value.
Further, the measurement result to current sensor carries out temperature drift amendment, after obtaining temperature drift amendment
Electric current the step for, specifically include：
The offline measurement result obtained when current sensor measures different electric currents at different temperatures；
The actual value of the measurement result obtained offline and current sensor is subjected to numerical fitting, the survey obtained offline
The fit correlation f () of the actual value RI of result MI and current sensor is measured, the expression formula of the fit correlation f () is：RI=f
(MI, T), wherein, T is temperature；
According to obtained fit correlation f (), the revised electric current of temperature drift is calculated.
Further, it is described to establish battery model, and calculate the voltage of the battery model and the actual measurement voltage of battery of foundation
The step for residual error, specifically include：
The battery model of stand-by battery is obtained offline；
The voltage residual error of the battery model and the actual measurement voltage of battery established is calculated according to the battery model obtained offline.
Further, it is described obtain stand-by battery offline battery model the step for, specifically include：
The OCV-SOC scatterplot tables of stand-by battery at different temperatures are obtained offline, and are dissipated according to the OCV-SOC obtained offline
Point table obtains the battery model of stand-by battery with function-fitting method, wherein, OCV is the open-circuit voltage of stand-by battery, and SOC is stand-by
The remaining capacity of battery；
Obtain the DC internal resistance of stand-by battery, the method for the DC internal resistance for obtaining stand-by battery include off-line method and
In any of line method, the expression formula of the DC internal resistance DCR of the stand-by battery is：DCR=Δ V/ Δ I, wherein, Δ V
For the front and rear voltage difference of stand-by cell voltage V mutation, Δ I is the front and rear current differential of stand-by battery current I mutation；
The terminal voltage of stand-by battery, the stand-by battery are calculated according to the battery model of stand-by battery and DC internal resistance DCR
Terminal voltage Vt calculation formula be：Vt=OCV+I*DCR.
Further, the battery model that the basis obtains offline calculates the battery model and the actual measurement voltage of battery established
Voltage residual error the step for, specifically include：
Determine the SOC of stand-by battery, the definite method of the SOC of the stand-by battery includes manually setting, from the last time
Record any of reading and OCV-SOC calibrations in data；
Measure the actual terminal voltage Ut of stand-by battery；
The terminal voltage Vt of stand-by battery model is calculated according to the SOC of stand-by battery；
According to the terminal voltage Vt of the actual terminal voltage Ut of stand-by battery and stand-by battery model, the battery model of foundation is calculated
With the voltage residual error of the actual measurement voltage of battery, the voltage residual error Err of the battery model and the actual measurement voltage of battery is calculated
Formula is：Err=Ut-Vt.
Further, the step for the drift current according to the voltage residual computations current sensor of calculating, it is specially：
According to the drift current of the voltage residual computations current sensor of calculating, the drift current meter of the current sensor
Calculating formula is：Iflo (k+1)=a*Iflo (k)+g (Err), wherein, Err is the voltage residual error calculated, and a is 0~1 constant,
Iflo (k+1) and Iflo (k) is respectively the current drift current of current sensor and last drift current, and g (Err) serves as reasons
The current drift changing value that voltage residual error Err is determined.
Further, the computational methods of the current drift changing value g (Err) include linear method and proportional, integral method
Any of, corresponding g (Err) expression formula of the linear method is：G (Err)=K*Err, wherein K are greater than 0 constant；
Corresponding g (Err) expression formula of the proportional, integral method is：G (Err)=K1*Err+K2* ∫ Err；Wherein K1 and K2 is big
In 0 constant, ∫ is integral sign.
Further, it is further comprising the steps of：
Inputted using the electric current actual value of battery management system as electric current, the surplus of battery is estimated using the method for current integration
Remaining electricity.
The second technical solution for being taken of the present invention is：
A kind of current drift correction system of battery management system, including：
Temperature drift correcting module, for carrying out temperature drift amendment to the measurement result of current sensor, obtains temperature
Electric current after drift correction；
Voltage residual computations module, for establishing battery model, and calculates battery model and the actual measurement of battery of foundation
The voltage residual error of voltage；
Drift current computing module, the drift current for the voltage residual computations current sensor according to calculating；
Electric current actual value acquisition module, for by the drift current phase of the revised electric current of temperature drift and current sensor
Add, obtain the electric current actual value of battery management system.
The 3rd technical solution taken of the present invention is：
A kind of current drift means for correcting of battery management system, including：
Memory, for storing program；
Processor, for loading described program to perform a kind of electricity of battery management system as described in the first technical solution
Flow drift correction method.
The present invention method beneficial effect be：First using the conventional modified method of temperature drift to current sensor
Measurement result carries out preliminary temperature drift amendment；Next establishes accurate battery model, actual by battery model and battery
The contrast of voltage is measured, obtains voltage residual error；Recycle the drift of the further calculating current sensor of voltage residual error；Finally by temperature
Electric current after degree drift correction is added with drift current, obtains the electric current actual value of battery management system, technical side of the invention
Case is additionally arranged according to voltage residual error the method to carry out further drift correction on the basis of existing temperature drift modification method,
One of origin cause of formation that voltage residual error between the voltage of model output and the voltage truly measured is drifted about as current sensor, leads to
Crossing realizes the electric current actual value that the revised electric current of temperature drift is added with drift current to current sensor electric current
Closed-cycle correction, current measurement result error smaller, adapts to the requirement of different use environments, temperature or sensor model number,
Robustness is good, and implementation complexity is low, and without additional hardware, cost is low, and result can directly with most of existing cell tube
Manage system schema to combine, there is good compatibility.
The present invention system beneficial effect be：Using conventional temperature drift amendment first in temperature drift correcting module
Method preliminary temperature drift amendment is carried out to the measurement result of current sensor；Secondly built in voltage residual computations module
Accurate battery model is found, by the contrast of the actual measurement voltage of battery model and battery, obtains voltage residual error；Again in drift electricity
The drift of the further calculating current sensor of voltage residual error is utilized in stream calculation module；Finally in electric current actual value acquisition module
The revised electric current of temperature drift is added with drift current, obtains the electric current actual value of battery management system, skill of the invention
Art scheme is additionally arranged according to voltage residual error on the basis of existing temperature drift modification method to carry out further drift correction
Method, using the voltage residual error between the voltage of model output and the voltage that truly measures as current sensor drift about into therefore
One, realized by the electric current actual value for being added the revised electric current of temperature drift with drift current to current sensor
The Closed-cycle correction of electric current, current measurement result error smaller, adapts to wanting for different use environments, temperature or sensor model number
Ask, robustness is good, and implementation complexity is low, and without additional hardware, cost is low, and result can directly with most of existing battery
Management system scheme combines, and has good compatibility.
The device of the invention beneficial effect is：The program of processor load store device storage is first using conventional temperature drift
Move modified method and preliminary temperature drift amendment is carried out to the measurement result of current sensor；Next establishes accurate battery mould
Type, by the contrast of the actual measurement voltage of battery model and battery, obtains voltage residual error；Voltage residual error is recycled further to calculate
The drift of current sensor；Finally the revised electric current of temperature drift is added with drift current, obtains battery management system
Electric current actual value, technical scheme be additionally arranged on the basis of existing temperature drift modification method according to voltage residual error come
The method for carrying out further drift correction, using the voltage residual error between the voltage of model output and the voltage truly measured as electricity
One of origin cause of formation of flow sensor drift is true by the electric current for being added the revised electric current of temperature drift with drift current
Value realizes the Closed-cycle correction to current sensor electric current, current measurement result error smaller, adapt to different use environments,
The requirement of temperature or sensor model number, robustness is good, and implementation complexity is low, and without additional hardware, cost is low, and result can be straight
Connect and combined with most of existing battery management system scheme, there is good compatibility.
Brief description of the drawings
Fig. 1 is a kind of step flow chart of the current drift bearing calibration of battery management system of the present invention；
Fig. 2 is a kind of specific implementation flow chart of the current drift bearing calibration of the present invention；
Fig. 3 is 1 D.C. resistance of the embodiment of the present invention and the graph of a relation of SOC；
Fig. 4 is the comparison diagram of drift current value and true drift current value that the embodiment of the present invention 1 calculates；
Fig. 5 estimates the comparative result figure of SOC for the embodiment of the present invention 1 using different electric current modification methods.
Embodiment
With reference to Fig. 1, a kind of current drift bearing calibration of battery management system, comprises the following steps：
Temperature drift amendment is carried out to the measurement result of current sensor, obtains the revised electric current of temperature drift；
Battery model is established, and calculates the voltage residual error of the battery model and the actual measurement voltage of battery of foundation；
According to the drift current of the voltage residual computations current sensor of calculating；
The revised electric current of temperature drift is added with the drift current of current sensor, obtains the electricity of battery management system
Flow actual value.
The current drift modification method of conventional open-loop, pre-set " at a certain temperature, the drift of electric current is exactly one
This relation of definite numerical value ", does not carry out feedback modifiers, precision is not high, and poor robustness with reference to residual error.The present invention passes through
Temperature drift amendment and the modified Closed-cycle correction method of residual feedback, can improve the precision of current detecting on average,
When by this method and Current integrating method combining estimate battery dump energy, it is not only able to improve estimated accuracy, and can also be right
Cell degradation produces adaptive amendment, its implementation complexity is low, and without additional hardware, cost is low, and can directly with big portion
Divide existing battery management system scheme to combine, there is good compatibility.
Preferred embodiment is further used as, the measurement result to current sensor carries out temperature drift amendment,
The step for obtaining temperature drift revised electric current, specifically includes：
The offline measurement result obtained when current sensor measures different electric currents at different temperatures；
The actual value of the measurement result obtained offline and current sensor is subjected to numerical fitting, the survey obtained offline
The fit correlation f () of the actual value RI of result MI and current sensor is measured, the expression formula of the fit correlation f () is：RI=f
(MI, T), wherein, T is temperature；
According to obtained fit correlation f (), the revised electric current of temperature drift is calculated.
Wherein, common temperature drift amendment side has been continued to use in the measurement result progress temperature drift amendment to current sensor
Method, by measurement result and actual value of the part with temperature drift obtained offline, fits the relation curve or relation of the two
Function, then can obtain temperature drift according to real-time temperature, measurement result and the relation curve fitted or relation function
Revised electric current.
Preferred embodiment is further used as, it is described to establish battery model, and calculate the battery model and battery of foundation
The step for voltage residual error of actual measurement voltage, specifically include：
The battery model of stand-by battery is obtained offline；
The voltage residual error of the battery model and the actual measurement voltage of battery established is calculated according to the battery model obtained offline.
Be further used as preferred embodiment, it is described obtain stand-by battery offline battery model the step for, specifically
Including：
The OCV-SOC scatterplot tables of stand-by battery at different temperatures are obtained offline, and are dissipated according to the OCV-SOC obtained offline
Point table obtains the battery model of stand-by battery with function-fitting method, wherein, OCV is the open-circuit voltage of stand-by battery, and SOC is stand-by
The remaining capacity of battery；
Obtain the DC internal resistance of stand-by battery, the method for the DC internal resistance for obtaining stand-by battery include off-line method and
In any of line method, the expression formula of the DC internal resistance DCR of the stand-by battery is：DCR=Δ V/ Δ I, wherein, Δ V
For the front and rear voltage difference of stand-by cell voltage V mutation, Δ I is the front and rear current differential of stand-by battery current I mutation；
The terminal voltage of stand-by battery, the stand-by battery are calculated according to the battery model of stand-by battery and DC internal resistance DCR
Terminal voltage Vt calculation formula be：Vt=OCV+I*DCR.
Preferred embodiment is further used as, the battery model that the basis obtains offline calculates the battery model established
With battery it is actual measurement voltage voltage residual error the step for, specifically include：
Determine the SOC of stand-by battery, the definite method of the SOC of the stand-by battery includes manually setting, from the last time
Record any of reading and OCV-SOC calibrations in data；
Measure the actual terminal voltage Ut of stand-by battery；
The terminal voltage Vt of stand-by battery model is calculated according to the SOC of stand-by battery；
According to the terminal voltage Vt of the actual terminal voltage Ut of stand-by battery and stand-by battery model, the battery model of foundation is calculated
With the voltage residual error of the actual measurement voltage of battery, the voltage residual error Err of the battery model and the actual measurement voltage of battery is calculated
Formula is：Err=Ut-Vt.
It is further used as preferred embodiment, the drift electricity of the voltage residual computations current sensor according to calculating
The step for stream, be specially：
According to the drift current of the voltage residual computations current sensor of calculating, the drift current meter of the current sensor
Calculating formula is：Iflo (k+1)=a*Iflo (k)+g (Err), wherein, Err is the voltage residual error calculated, and a is 0~1 constant,
Iflo (k+1) and Iflo (k) is respectively the current drift current of current sensor and last drift current, and g (Err) serves as reasons
The current drift changing value that voltage residual error Err is determined.
Preferred embodiment is further used as, the computational methods of the current drift changing value g (Err) include linear side
Any of method and proportional, integral method, corresponding g (Err) expression formula of the linear method are：G (Err)=K*Err, its
Middle K is greater than 0 constant；Corresponding g (Err) expression formula of the proportional, integral method is：G (Err)=K1*Err+K2* ∫
Err；Wherein K1 and K2 is greater than 0 constant, and ∫ is integral sign.
With reference to Fig. 1, preferred embodiment is further used as, it is further comprising the steps of：
Inputted using the electric current actual value of battery management system as electric current, the surplus of battery is estimated using the method for current integration
Remaining electricity.
The electric current actual value for the battery management system that the present invention is calculated, can produce cell degradation adaptive repair
Just, there can be good compatibility with other existing SOC algorithm for estimating slitless connections.
It is corresponding with the method for Fig. 1, a kind of current drift correction system of battery management system of the present invention, including：
Temperature drift correcting module, for carrying out temperature drift amendment to the measurement result of current sensor, obtains temperature
Electric current after drift correction；
Voltage residual computations module, for establishing battery model, and calculates battery model and the actual measurement of battery of foundation
The voltage residual error of voltage；
Drift current computing module, the drift current for the voltage residual computations current sensor according to calculating；
Electric current actual value acquisition module, for by the drift current phase of the revised electric current of temperature drift and current sensor
Add, obtain the electric current actual value of battery management system.
It is corresponding with the method for Fig. 1, a kind of current drift means for correcting of battery management system, including：
Memory, for storing program；
Processor, for loading described program to perform a kind of current drift school of battery management system as shown in Figure 1
Correction method.
The present invention is further explained and illustrated with reference to explanation the drawings and specific embodiments.In following embodiments
Number of steps, it is set only for the purposes of illustrating explanation, does not do any restriction to the order between step, each in embodiment
The execution sequence of step can carry out accommodation according to the understanding of those skilled in the art.
Embodiment 1
With reference to Fig. 2, the residue of ferric phosphate lithium cell is estimated in the present embodiment current drift bearing calibration using the present invention
Electricity process, specifically includes following steps：
A, the drift current of current sensor at different temperatures is obtained offline；
B, the battery model of stand-by battery is obtained offline；
C, on-line identification drift current；
D, the battery SOC estimation based on Current integrating method.
The step A can specifically be subdivided into following steps：
Measurement result MI during different electric currents is measured under A1, acquisition current sensor different temperatures T；
A2, by the result MI of step A1 and actual value RI carry out numerical fitting, obtains the fit correlation f () of the two, is fitted
Relation f () can be expressed as：RI=f (MI, T)；
A3, the measurement electric current I for calculating with fit correlation f () and real-time measurements battery management system.
Preferably, the fit correlation of the present embodiment is：RI=MI.
The step B specifically comprises the following steps：
B1, the OCV-SOC scatterplot tables of offline acquisition battery at different temperatures, and be fitted with higher order functionality, obtain
Corresponding battery model.Wherein OCV refers to the open-circuit voltage of battery, and SOC refers to the remaining capacity of battery.
Preferably, the battery model fitted in this example is：
Vmo=E0+Iinput·r-k0/SOC-k1·SOC+k2·ln(SOC)+k3Ln (1-SOC) wherein, VmoIt is defeated for model
Go out voltage, IinputFor mode input electric current, r is the internal resistance of cell；E0、k0、k1And k2Be model coefficient, can preset or
It is given.
B2, the DC internal resistance for obtaining battery；
The acquisition methods of DC internal resistance include but not limited to off-line method and in line methods.DC internal resistance DCR is defined as
When electric current I is mutated, the ratio between the difference of voltage V and the difference of electric current I：
DCR=Δ V/ Δs I
B3, the terminal voltage for calculating stand-by battery；
It (is positive current during charging, when electric discharge is that the terminal voltage Vt of battery, which can be expressed as OCV and DC impedance in electric current I,
Negative current) the lower pressure drop of effect common results：
Vt=OCV+I*DCR
Preferably, in the present embodiment, the DC internal resistance of battery is that dynamic realtime is obtained and intended by low-pass filtering online
Close it is modified, as shown in Figure 3.
The step C specifically comprises the following steps：
The initial SOC of C1, specific battery；
The method that initial SOC is specified includes but not limited to：Manually set, OCV-SOC calibrations, from the record data of last time
Read etc.；Preferably, the method that SOC is specified in the present embodiment is initial OCV-SOC calibrations.
C2, circulated according to initial SOC, finally obtains drift current Iflo.
The step C2 is held successively when being circulated (condition that circulation terminates, such as cycle-index, can preset)
Row following steps C21~C25：
C21, the terminal voltage Ut, electric current I for measuring battery；
C22, the method correcting current I according to temperature drift；
C23, according to battery model calculate battery terminal voltage Vt；
C24, computation model and the voltage residual error actually measured：Err=Ut-Vt；
C25, according to residual error Err, calculate drift current Iflo according to method g：
Iflo (k+1)=a*Iflo (k)+g (Err), wherein, a is the constant between 0~1, Iflo (k+1) and Iflo (k)
Drift when drift current and kth time (last time) when respectively current sensor kth+1 time (i.e. current) circulates circulate
Electric current.
The method g includes but not limited to following method：
A) linear method：G (Err)=K*Err；Wherein K is greater than 0 constant；
B) proportional, integral method：G (Err)=K1*Err+K2* ∫ Err；Wherein K1 and K2 is greater than 0 constant.
In the step D, the electric current for integration be the cumulative of the revised electric current of temperature drift and drift current and.
Preferably, method g is using proportional, integral method in the present embodiment, specific current drift tracking result, and
Corresponding SOC estimated results, as shown in Figure 4 and Figure 5.
As can be seen from Figure 4 and Figure 5, the present embodiment drift correction method using the present invention can effectively suppress cell tube
Current drift in reason system, ensure that battery current is measured under average accurately, with the remaining battery of the current estimation
Electricity (SOC) evaluated error is less than 3%.
Embodiment 2
The present embodiment employs method similar to Example 1 to estimate ferric phosphate lithium cell remaining capacity, itself and implementation
The main distinction of example 1 has at following 3 points：
1) the present embodiment expression formula of fit correlation f () in step A2 is：
RI=(1.123+0.1662*MI-0.004063*MI*MI-0.1168/MI) * (1.928+0.1929* △ T-
0.002464*△T*△T-0.147/△T)
Wherein, △ T represent Current Temperatures sensor temperature and 0 degree Celsius of difference, i.e.,：△ T=(T-0).It is actual to make
In, T is generally higher than 0 degree Celsius.
2) the battery model expression formula that the present embodiment fits in step bl is determined is：
Uoc=β0+β1SOC+β2SOC2+β3SOC3+β4SOC4+β5SOC5
Wherein, UocFor the open-circuit voltage of battery, β0、β1、β2、β3、β4And β5It is battery model parameter, can presets
It is or given.
3) mode that the DC internal resistance DCR of battery is obtained in the present embodiment is specified offline.
The specific SOC estimated results of the present embodiment, it is as shown in table 1 below.
Table 1
As it can be seen from table 1 the present embodiment drift correction method using the present invention can effectively suppress battery management system
Current drift in system, ensure that battery current is measured under average accurately, with the battery dump energy of the current estimation
(SOC) evaluated error is less than 3%.
Generally speaking, the invention discloses current drift bearing calibration, system and the device of a kind of battery management system,
Method to carry out further drift correction is additionally arranged according to voltage residual error on the basis of existing temperature drift modification method, by mould
One of origin cause of formation that voltage residual error between the voltage of type output and the voltage that truly measures is drifted about as current sensor, pass through by
The electric current actual value that the revised electric current of temperature drift is added with drift current, which realizes, closes current sensor electric current
Ring amendment, current measurement result error smaller, adapts to the requirement of different use environments, temperature or sensor model number, realizes
Complexity is low, and without additional hardware, cost is low, and result can directly with most of existing battery management system scheme knot
Close, there is good compatibility.Present invention can ensure that battery current is measured under average accurately, with the current estimation
Battery dump energy (SOC) evaluated error is less than 3%, can have wide with other existing SOC algorithm for estimating slitless connections
Market application scenarios.
Above is the preferable of the present invention is implemented to be illustrated, but the present invention is not limited to the embodiment, and it is ripe
A variety of equivalent variations or replacement can also be made on the premise of without prejudice to spirit of the invention by knowing those skilled in the art, this
Equivalent deformation or replacement are all contained in the application claim limited range a bit.
Claims (10)
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