CN108248427A - The method of dynamic corrections SOC errors - Google Patents
The method of dynamic corrections SOC errors Download PDFInfo
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- CN108248427A CN108248427A CN201810036405.9A CN201810036405A CN108248427A CN 108248427 A CN108248427 A CN 108248427A CN 201810036405 A CN201810036405 A CN 201810036405A CN 108248427 A CN108248427 A CN 108248427A
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000012937 correction Methods 0.000 title claims abstract description 41
- 238000007600 charging Methods 0.000 claims abstract description 25
- 230000010354 integration Effects 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 24
- 238000010277 constant-current charging Methods 0.000 claims description 18
- 239000000178 monomer Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 abstract description 6
- 208000028659 discharge Diseases 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- 238000000205 computational method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The present invention relates to a kind of methods of dynamic corrections SOC errors, for being modified for the error of the SOC of battery system that battery management system obtains it (including very poor error and current peak error), include the following steps：(1) very poor error is estimated in the charging process of battery system；(2) current peak error is estimated in the course of work of battery system；(3) it is modified according to the very poor error and current peak error, the SOC of the battery system obtained to it that have obtained.The method of dynamic corrections SOC errors using the present invention, it can prevent SOC from saltus step occur during system works, the SOC error amounts caused by the frequent variation of bus current are estimated during battery system operation, and caused SOC errors carry out dynamic corrections during to carrying out SOC calculating using current integration method, the result of calculation for alloing SOC is more accurate, and it does not need to as open circuit voltage method correction SOC, required longer time of repose, suitable for the environment of non-stop run.
Description
Technical field
The present invention relates to field of battery management more particularly to battery capacity detection technique, in particular to a kind of dynamic corrections
The method of SOC errors.
Background technology
At present, battery dump energy (SOC, State Of Charge) is accurately calculated by battery management system (BMS) is
The difficult point of entire industry, often there are certain SOC saltus steps in the latter stage of discharge cycle in battery system, very poor in battery system
The variation of larger, applying working condition relatively acutely in the case of, the amplitude of SOC saltus steps can also increase therewith.
In the charging stage, battery management system would generally improve battery system using the charging stage of segmented constant current
Charge efficiency.And the method for the estimation battery system remaining capacity of battery management system generally use is included using current integration method
The estimation of the SOC of battery system is carried out, when carrying out SOC estimations using current integration method, estimation result mainly can be by following several
The influence of a factor：
(1) the very poor change to active volume of battery system；
(2) change of the size of current to battery active volume；
(3) frequency of detecting system acquisition current signal.
From the foregoing, it will be observed that when carrying out SOC estimations using current integration method, it can not calculate due to the very poor of battery system and lead
The reduction of the active volume of cause, and battery management system collected current data when carrying out SOC estimations be usually from
Scattered, but the variation of actually bus current is continuous, therefore inevitably be will appear in the acquisition for carrying out current data and adopted
The data and real data of collection have a case that certain deviation, and due to the different corresponding battery capacity of electric current also not phase
Together, the SOC calculated when bus current frequently changes using only current integration method can generate error.
In the prior art, more common method is that battery system is calculated in battery system dynamic change using current integration method
The SOC value of system, and SOC value is corrected by open-circuit voltage look-up table after sufficient standing, but since open-circuit voltage look-up table needs
Battery system takes a long time just can guarantee its accuracy to stand, therefore, if during battery system is in work,
When can not carry out standing for a long time, the SOC calculating error generated by current integration method will be unable to normally be corrected.
During vehicle travels, due to the operating mode of vehicle and the difference of weather environment, the current wave of vehicle load
Dynamic bigger, the result of the SOC calculated by current integration method inevitably will appear error, although repeatedly in charge and discharge cycles
The SOC errors accumulated can by being corrected after sufficient standing using open circuit voltage method and charging stage, but
Generated error still can cause the calculating of battery system SOC error occur in primary complete discharge process.
Invention content
The purpose of the present invention is overcome it is above-mentioned in the prior art the shortcomings that, providing one kind can estimate in charging process
The method of the dynamic corrections SOC errors of the error for the SOC for calculating due to very poor and generating.
In order to realize above-mentioned purpose, the method for dynamic corrections SOC errors of the invention is specific as follows：
The method of dynamic corrections SOC errors, is mainly characterized by, and electricity is obtained for the battery management system of electric vehicle
The dynamic corrections of error during the SOC of cell system, the error of the SOC includes very poor error and current peak error, described
Method include the following steps：
(1) battery management system described in estimates very poor error in the charging process of battery system；
(2) battery management system described in estimates current peak error in the course of work of battery system；
(3) battery management system described in is according to the very poor error and current peak error that have obtained, the electricity obtained to it
The SOC of cell system is modified.
Preferably, the SOC for the battery system that the battery management system is obtained by current integration method, and the electricity
Pond manage system in the charging process of battery system using the charging stage of the segmented constant current control battery system into
Row charging.
More preferably, the charging stage of the battery system includes high current constant-current charging phase and low current constant-current charge
Stage, and the step (1) obtains extreme value error by following steps：
(1.1) battery management system described in chooses at least two battery cells in battery system, and obtains and be selected
Battery cell voltage value；
(1.2) battery management system described in is according to the voltage value of the battery cell being selected to the battery cell that is selected
It is ranked up；
(1.3) battery management system described in obtains the voltage difference between arbitrary two adjacent battery cells after sequence, and
By preset threshold value, the voltage difference that will be greater than the threshold value is divided into high current group, will be small electricity less than the voltage differential of the threshold value
Stream group；
(1.4) battery management system described in is in high current constant-current charging phase according to the voltage difference and composition of high current group
The voltage value of the battery cell of voltage difference obtains the very poor error of large current charge；The battery management system is in low current constant current
Charging stage is very poor according to the voltage value acquisition low current charge of the voltage difference of low current group and the battery cell of composition voltage difference
Error；
(1.5) battery management system described in is to the very poor error of large current charge and the very poor error of low current charge
It sums up and obtains very poor error.
More preferably, it is obtained in the step (1.4) according to the voltage value of voltage difference and the battery cell for forming voltage difference
The step of very poor error is：
The battery management system obtains the battery list in the battery cell for forming voltage difference with relatively low voltage value
Body rises the electricity needed for the voltage difference, and by the rated capacity of the electricity divided by the battery cell, and it is very poor to obtain single group
Error, and after the very poor error of single group for obtaining all two groups of adjacent battery cells, all very poor errors of single group are added up,
Obtain the very poor error of high current or the very poor error of low current.
More preferably, it is further comprising the steps of before the step (1.1)：
(1.0) battery management system described in obtains the terminal voltage of each battery cell in battery system, and judges each electricity
Whether the variation of the terminal voltage of pond monomer monomer enters stable state, if so, entering step (1.1), otherwise, continues to judge current electricity
Whether the voltage change of cell system enters stable state.
More preferably, the variation of the terminal voltage for judging each battery cell whether into stable state be specially：
Whether the battery management system judges the terminal voltage of its battery cell obtained in rising passway.
More preferably, include the following steps in step (2)：
(2.1) battery management system described in obtains time of battery system positive spike of bus current in preset time
Number and the number and intensity of intensity and current feedback；
(2.2) battery management system described according to the number and intensity of positive spike and the number of current feedback and
Intensity inquires current peak SOC errors tables, obtains the forward direction spike and the corresponding current peak error of current feedback.
More preferably, the step (3) includes the following steps：
(3.1) battery cell with maximum voltage value in the battery management system acquisition battery system described in, and according to
The very poor error acquisition obtained has modified the SOC after very poor error；
(3.2) battery management system described according to the current peak error obtained, to it is described have modified it is very poor
SOC after error carries out current peak error correction.
More preferably, the step of battery management system acquisition has modified the SOC after very poor error be：
Battery management system described in (3.1.1) obtains the SOC_H of the battery cell with maximum voltage value, and this is had
The SOC_H for having the battery cell of maximum voltage value subtracts the very poor error, obtains the battery cell with minimum voltage value
SOC_L；
Battery management system described in (3.1.2) is to the SOC_H of the battery cell with maximum voltage value and with minimum
The SOC_L of the battery cell of voltage value is weighted, and obtains the SOC after correcting very poor error.
More preferably, battery management system has highest electricity according to the following formula to described in the step (3.1.2)
The SOC_H of the battery cell of pressure value and the SOC_L of battery cell with minimum voltage value are weighted, and are obtained and are corrected very poor mistake
SOC after difference：
SOC=α × SOC_H+ β × SOC_L；
Wherein, α, β are weights, and alpha+beta=1, α=SOC_H/100.
The method of dynamic corrections SOC errors using the present invention improves the accuracy that battery management system calculates SOC,
It can prevent SOC from saltus step occur during system works, can be estimated during battery system operation due to mother
SOC error amounts caused by the frequent variation of line current.It can be to using caused SOC during current integration method progress SOC estimations
Error amount carries out dynamic corrections so that the result of calculation of SOC can be more accurate.Meanwhile avoid open-circuit voltage correction SOC
Required longer time of repose so that the battery management system using the method in the present invention can be suitable for uninterrupted work
The environment of work.
Description of the drawings
Fig. 1 is the calculation flow chart based on the very poor SOC errors of battery system.
Fig. 2 is the calculating that SOC amendment errors are obtained based on the number for occurring current spike and current feedback in bus current
Flow chart.
Specific embodiment
In order to be more clearly understood that the technology contents of the present invention, spy lifts following embodiment and is described in detail.
The method of dynamic corrections SOC errors, when obtaining the SOC of battery system for the battery management system of electric vehicle
Error dynamic corrections, the error of the SOC includes very poor error and current peak error, and the method includes following
Step：
(1) battery management system described in estimates very poor error in the charging process of battery system；
(2) battery management system described in estimates current peak error in the course of work of battery system；
(3) battery management system described in is according to the very poor error and current peak error that have obtained, the electricity obtained to it
The SOC of cell system is modified.
In a kind of preferred embodiment, battery system that the battery management system is obtained by current integration method
SOC, and the battery management system controls institute in the charging process of battery system using the charging stage of segmented constant current
The battery system stated charges.
In a kind of more preferably embodiment, charging stage of the battery system include high current constant-current charging phase and
Low current constant-current charging phase, and the step (1) obtains extreme value error by following steps：
(1.1) battery management system described in chooses at least two battery cells in battery system, and obtains and be selected
Battery cell voltage value；
(1.2) battery management system described in is according to the voltage value of the battery cell being selected to the battery cell that is selected
It is ranked up；
(1.3) battery management system described in obtains the voltage difference between arbitrary two adjacent battery cells after sequence, and
By preset threshold value, the voltage difference that will be greater than the threshold value is divided into high current group, will be small electricity less than the voltage differential of the threshold value
Stream group；
(1.4) battery management system described in is in high current constant-current charging phase according to the voltage difference and composition of high current group
The voltage value of the battery cell of voltage difference obtains the very poor error of large current charge；The battery management system is in low current constant current
Charging stage is very poor according to the voltage value acquisition low current charge of the voltage difference of low current group and the battery cell of composition voltage difference
Error；
(1.5) battery management system described in is to the very poor error of large current charge and the very poor error of low current charge
It sums up and obtains very poor error.
In a kind of more preferably embodiment, according to the battery list of voltage difference and composition voltage difference in the step (1.4)
The voltage value of body obtains the step of very poor error and is：
The battery management system obtains the battery list in the battery cell for forming voltage difference with relatively low voltage value
Body rises the electricity needed for the voltage difference, and by the rated capacity of the electricity divided by the battery cell, and it is very poor to obtain single group
Error, and after the very poor error of single group for obtaining all two groups of adjacent battery cells, all very poor errors of single group are added up,
Obtain the very poor error of high current or the very poor error of low current.
It is further comprising the steps of before the step (1.1) in a kind of more preferably embodiment：
(1.0) battery management system described in obtains the terminal voltage of each battery cell in battery system, and judges each electricity
Whether the variation of the terminal voltage of pond monomer monomer enters stable state, if so, entering step (1.1), otherwise, continues to judge current electricity
Whether the voltage change of cell system enters stable state.In a particular embodiment, charging stage, either high current constant-current phase also
It is low current constant-current phase, the terminal voltage that SOC is the battery cell in battery system is obtained by battery management system
It is carried out when variation is in stable state.
In a kind of more preferably embodiment, whether the variation of the terminal voltage for judging each battery cell enters stable state
Specially：
Whether the battery management system judges the terminal voltage of its battery cell obtained in rising passway.
In a kind of more preferably embodiment, step includes the following steps in (2)：
(2.1) battery management system described in obtains time of battery system positive spike of bus current in preset time
Number and the number and intensity of intensity and current feedback；
(2.2) battery management system described according to the number and intensity of positive spike and the number of current feedback and
Intensity inquires current peak SOC errors tables, obtains the forward direction spike and the corresponding current peak error of current feedback.
In a kind of more preferably embodiment, the step (3) includes the following steps：
(3.1) battery cell with maximum voltage value in the battery management system acquisition battery system described in, and according to
The very poor error acquisition obtained has modified the SOC after very poor error；
(3.2) battery management system described according to the current peak error obtained, to it is described have modified it is very poor
SOC after error carries out current peak error correction.
In a kind of more preferably embodiment, the step of battery management system acquisition has modified the SOC after very poor error, is：
Battery management system described in (3.1.1) obtains the SOC_H of the battery cell with maximum voltage value, and this is had
The SOC_H for having the battery cell of maximum voltage value subtracts the very poor error, obtains the battery cell with minimum voltage value
SOC_L；
Battery management system described in (3.1.2) is to the SOC_H of the battery cell with maximum voltage value and with minimum
The SOC_L of the battery cell of voltage value is weighted, and obtains the SOC after correcting very poor error.
In a kind of more preferably embodiment, in the step (3.1.2) battery management system according to the following formula to institute
The SOC_L of the SOC_H for the battery cell with maximum voltage value stated and the battery cell with minimum voltage value is weighted,
Obtain the SOC after correcting very poor error：
SOC=α × SOC_H+ β × SOC_L；
Wherein, α, β are weights, and alpha+beta=1, α=SOC_H/100.
Referring to Fig. 2, in a kind of specific embodiment, the battery management system can also to current peak error into
The further correction of row, specially：
The battery management system judges whether the lower voltage limit for reaching battery cell or battery sufficient standing,
If reach the lower voltage limit of battery cell, battery management system judge carry out current peak error correction SOC whether
Equal to 0, if equal to 0, the current peak error is without further correcting；If not equal to 0, according to progress current peak mistake
The modified SOC of difference further corrects current peak error；If battery cell sufficient standing, passes through open circuit
Voltage method obtains the SOC of battery cell, and the SOC is compared with carrying out the modified SOC of overcurrent peak error, if the two phase
Deng then without further being corrected to the SOC for carrying out current peak error correction, if there are difference, the batteries for the two
Management system further corrects current peak error according to the difference.
The SOC that current peak error correction has been carried out in step (3.2) is carried out also according to above-mentioned correction course further
Amendment.In a particular embodiment, above-mentioned " further correction " is the battery management system to storing inside it
Value in the table of the corresponding SOC errors of current peak is updated, and according to the lower voltage limit of battery cell when is corresponding " to carry out electricity
The SOC " or battery cell of stream peak value error correction sufficient standing when " difference " SOC errors corresponding to certain current peak
Carry out further correction update.
In a particular embodiment, due to the charging stage in battery system, the battery management system would generally use
The charging stage of segmented constant current controls the charging of battery, to improve the charge efficiency of battery system, so the electricity of the present invention
Pond is managed system and different very poor errors is obtained based on the different charging stages, as follows to the computational methods of very poor error：
(1) it chooses and preserves the voltage value of the battery cell in battery system (at least two) as the starting point calculated.
And obtain the voltage value of selected each battery cell.For example, the tool provided using collection plate each in battery management system
There is the battery cell of local maximum voltage value and minimum voltage value, obtain the voltage value of the two as the number for being used for calculating error amount
According to so as to by the very poor voltage difference resolved between battery cell one by one of battery system, shorten the time of overall calculation, reducing
Due to the calculating error that battery polarization leads to the rising of terminal voltage and generates.
(2) each battery cell is ranked up according to the voltage value of the battery cell of selection, and determined per adjacent two-by-two
Voltage value between pressure difference, by preset threshold value by voltage differential be high current group and low current group, if pressure difference is smaller
If, then it is only calculated in low current constant-current charging phase, if pressure difference is bigger, only in high current constant-current charging phase
It is calculated.In this way the reason of is that the duration of low current constant-current charging phase is generally shorter, and for pressure difference ratio
Larger situation, the time needed for error that low current calculates is also long, is susceptible to endless situation, and high current
Constant-current charging phase, the polarization phenomena that battery generates within the similary time are more clear than low current, and such terminal voltage rises
Speed can not be suitable for the smaller situation of pressure difference between battery cell quickly.
According to the experimental data of ternary lithium battery system, under similar charging initial conditions, the pressure of two battery cells
When difference is more than 35mv, in the result that low current constant-current charging phase calculates with being calculated in high current constant-current charging phase
Resultant error within 5%.(error is：(result of result/high current of 1- low currents) × 100%).Therefore at two
In the case that the pressure difference of battery cell is bigger, one is respectively calculated in high current constant-current charging phase and low current constant-current charging phase
The very poor error amount in part is that comparison is rational.In the smaller situation of battery cell pressure difference, only by low current constant-current charge
Very poor error when stage calculates low current, in the bigger situation of battery cell pressure difference, only by high current constant-current charge rank
Very poor error when section calculates high current, very poor error and very poor error sums it up during high current during by low current, that is, obtain new pole
The very poor error is also stored in the memory of battery management system, and update by poor error delta SOC, the battery management system
Previously stored result of calculation in memory, is denoted as very poor error amount being stored as Δ SOC.Corresponding software flow pattern such as Fig. 1
It is shown.
In Fig. 1, v1, v2, v3 ..., represented by vn be battery cell voltage value, v1 ', v2 ', v3 ' ..., vn ' institutes table
What is shown is the voltage value of the battery cell of real-time update, t1, t2, t3 ..., represented by tn-1 be the time.Stable state is during charging
Refer to the stage that voltage slowly rises.Voltage multilevel iudge is needed in Fig. 1, this step is that explanation only works as the current of whole
When newer battery cell voltage value is both greater than the value of corresponding next electrical voltage point, can just preserve from vn rise to vn ' when
Between, so as to obtain corresponding electricity, and corresponding very poor error is further obtained, in v1 '>v2、v2’>It is added between v3 ...
Or, as long as to show that the condition is that have corresponding conditions to meet to can be carried out corresponding time timing.
Charging is completed in battery system, into discharge condition when, have three in the battery management system to calculate SOC
Value, be SOC_H, SOC_L and very poor error delta SOC respectively, the battery management system, which obtains, has maximum voltage value
Battery cell SOC_H, the SOC of the battery cell with maximum voltage value and very poor error delta SOC are subtracted each other, obtain tool
Have minimum voltage value battery cell SOC_L, the battery management system adds the SOC_H calculated and SOC_L
Power obtains the SOC of present battery system, the SOC finally calculated is allow more accurately to reflect the electricity of present battery system
Amount situation.Specially：
SOC=α × SOC_H+ β × SOC_L；
Wherein, α, β are weights, and the relationship between α and β is linear, and alpha+beta=1.
In a particular embodiment, the α is obtained by the following formula：
α=SOC_H/100.
In discharge regime, high current can lead to the decline of battery active volume, simultaneously as the characteristic of current sensor,
When there is forward current spike, the peak value of the electric current of measurement and practical current peak are there are certain deviation, typically
The value of measurement is less than practical value, and therefore, the forward current spike number of appearance is more, and peak value is bigger, leads to the error of SOC
Bigger, operating current is bigger, and the error that SOC value occurs also can be bigger.Therefore, during vehicle travels, bus current
The forward current spike and current feedback of middle appearance will also result in error.Interior at the same time, the number that they occur is got over
More, the deviation for needing modified SOC is also more, and the amount of specific deviation needs to be determined jointly according to their intensity and number.
Therefore, the battery management system is according to the forward current point occurred in the bus current of battery system counted in a period of time
The number and intensity at peak and current feedback are tabled look-up and are obtained corresponding to the number and intensity of the forward current spike and current feedback
Current peak error, and will be exported to the SOC of driver according to the current peak error update, bus current frequency is realized with this
To the accurate estimation of SOC during numerous variation.
The current peak errors table is obtained by experiment test, under different operating currents, determines different electricity
Stream peak value and the relationship with SOC errors, so as to obtain current peak errors table.
The method of dynamic corrections SOC errors using the present invention improves the accuracy that battery management system calculates SOC,
It can prevent SOC from saltus step occur during system works, can be estimated during battery system operation due to mother
SOC error amounts caused by the frequent variation of line current.It can be to using caused SOC during current integration method progress SOC estimations
Error amount carries out dynamic corrections so that the result of calculation of SOC can be more accurate.Meanwhile avoid open-circuit voltage correction SOC
Required longer time of repose so that the battery management system using the method in the present invention can be suitable for uninterrupted work
The environment of work.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (10)
- A kind of 1. method of dynamic corrections SOC errors, which is characterized in that obtain battery for the battery management system of electric vehicle The dynamic corrections of error during the SOC of system, the error of the SOC includes very poor error and current peak error, described Method includes the following steps：(1) battery management system described in estimates very poor error in the charging process of battery system；(2) battery management system described in estimates current peak error in the course of work of battery system；(3) battery management system described in is according to the very poor error and current peak error that have obtained, the battery system obtained to it The SOC of system is modified.
- 2. the method for dynamic corrections SOC errors according to claim 1, which is characterized in that the battery management system By the SOC for the battery system that current integration method obtains, and the battery management system is in the charging process of battery system It is charged using the charging stage control of the segmented constant current battery system.
- 3. the method for dynamic corrections SOC errors according to claim 2, which is characterized in that the battery system fills The electric stage includes high current constant-current charging phase and low current constant-current charging phase, and the step (1) passes through following steps Obtain extreme value error：(1.1) battery management system described in chooses at least two battery cells in battery system, and obtains the electricity being selected The voltage value of pond monomer；(1.2) battery management system described in carries out the battery cell being selected according to the voltage value for the battery cell being selected Sequence；(1.3) battery management system described in obtains the voltage difference between arbitrary two adjacent battery cells after sequence, and passes through Preset threshold value, the voltage difference that will be greater than the threshold value are divided into high current group, will be low current group less than the voltage differential of the threshold value；(1.4) battery management system described according to the voltage difference of high current group and forms voltage in high current constant-current charging phase The voltage value of the battery cell of difference obtains the very poor error of large current charge；The battery management system is in low current constant-current charge Stage obtains the very poor error of low current charge according to the voltage value of the voltage difference of low current group and the battery cell of composition voltage difference；(1.5) battery management system described in carries out the very poor error of large current charge and the very poor error of low current charge It sums it up, obtains very poor error.
- 4. the method for dynamic corrections SOC errors according to claim 3, which is characterized in that root in the step (1.4) It is according to the step of voltage difference and voltage value acquisition very poor error for the battery cell for forming voltage difference：The battery management system, which is obtained in the battery cell for forming voltage difference, to be had on the battery cell of relatively low voltage value The electricity needed for the voltage difference is risen, and by the rated capacity of the electricity divided by the battery cell, obtains the very poor error of single group, And after the very poor error of single group for obtaining all two groups of adjacent battery cells, all very poor errors of single group are added up, it obtains The corresponding very poor error of large current charge or the very poor error of low current charge.
- 5. the method for dynamic corrections SOC errors according to claim 3, which is characterized in that before the step (1.1) It is further comprising the steps of：(1.0) battery management system described in obtains the terminal voltage of each battery cell in battery system, and judges each battery list Whether the variation of the terminal voltage of body monomer enters stable state, if so, entering step (1.1), otherwise, continues to judge present battery system Whether the voltage change of system enters stable state.
- 6. the method for dynamic corrections SOC errors according to claim 5, which is characterized in that each battery of the judgement The variation of the terminal voltage of monomer whether into stable state be specially：Whether the battery management system judges the terminal voltage of its battery cell obtained in rising passway.
- 7. the method for dynamic corrections SOC errors according to claim 2, which is characterized in that step (2) includes following step Suddenly：(2.1) battery management system described in obtain battery system in preset time the number of the positive spike of bus current and The number and intensity of intensity and current feedback；(2.2) battery management system described according to the number and intensity of positive spike and the number and intensity of current feedback, Current peak SOC errors tables are inquired, obtain the forward direction spike and the corresponding current peak error of current feedback.
- 8. the method for dynamic corrections SOC errors according to claim 2, which is characterized in that the step (3) including with Lower step：(3.1) battery management system described in obtains the battery cell in battery system with maximum voltage value, and according to The very poor error acquisition obtained has modified the SOC after very poor error；(3.2) battery management system described in has modified very poor error according to the current peak error obtained to described SOC afterwards carries out current peak error correction.
- 9. the method for dynamic corrections SOC errors according to claim 8, which is characterized in that in the step (3.1), The step of battery management system acquisition has modified the SOC after very poor error be：Battery management system described in (3.1.1) obtains the SOC_H of the battery cell with maximum voltage value, and this is had most The SOC_H of the battery cell of high-voltage value subtracts the very poor error, obtains the SOC_L of the battery cell with minimum voltage value；Battery management system described in (3.1.2) is to the SOC_H of the battery cell with maximum voltage value and with minimum voltage The SOC_L of the battery cell of value is weighted, and obtains the SOC after correcting very poor error.
- 10. the method for dynamic corrections SOC errors according to claim 9, which is characterized in that the step (3.1.2) Middle battery management system is according to the following formula to the SOC_H of the battery cell with maximum voltage value and with minimum electricity The SOC_L of the battery cell of pressure value is weighted, and obtains the SOC after correcting very poor error：SOC=α × SOC_H+ β × SOC_L；Wherein, α, β are weights, and alpha+beta=1, α=SOC_H/100.
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