CN106953394A - A kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity - Google Patents
A kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
Abstract
The present invention discloses a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity, pass through sets target SOC, the SOC windows of the work of each battery cell unit in battery system can be flexibly set, and judged by balanced from the point of view of battery parameter, improve equalization efficiency and avoid missing balanced simultaneously.And target electricity difference is then used to specifically judge that the electricity of each battery cell or battery pack string and target battery monomer is poor whether within allowed band, if it exceeds this scope, which then can contemplate, opens balanced；Thus make each battery cell cell operation in battery system in most suitable SOC windows, realize the longer service life of battery cell unit and Geng Gao equalization efficiency, the economy of battery system can be improved.
Description
Technical field
The present invention relates to cell art, and in particular to a kind of based on lithium-ion battery monomer SOC and monomer capacity
Equalization methods.
Background technology
Lithium ion battery is widely used in new-energy automobile and energy-storage system as energy storage system, due to office
It is limited to the voltage and capacity of single lithium battery, it is necessary to combine shape by battery cell series, parallel or by certain connection in series-parallel
Into battery system, provide enough power and energy to meet the requirement of its power and course continuation mileage to electric automobile；If electric
Difference is not present between the monomer of pond in actual applications, then the battery pack and battery cell of electric automobile are in service life and safety
It is consistent in property；But in actual applications, it is total between battery cell due to manufacturing process and using the inconsistent of process environment
It is the presence of inconsistency, and because the degree of aging and state in actually used are also different, the otherness of battery cell is past
It is increasing toward meeting；The otherness of these battery cells is often shown as in same battery system, the electricity of each battery pack string
Pressure is different, and the phenomenon of the voltage difference opposite sex can often change and unpredictable in actual use.
Lithium battery monomer must be by the use of safety in battery system, it means that the voltage of each battery cell makes
Used time be preferably must be held within the scope of safe voltage, that is, be less than high safety voltage threshold when charging, and lower security is higher than during electric discharge
Voltage threshold.But, in the practical application of more than one battery pack string, due to need ensure each battery cell or
Battery pack string is operated within the scope of safe voltage, the different in nature meeting of otherness and voltage difference of different battery cells or battery pack string
The use voltage range of limitation battery system really；This means with the expansion of battery otherness, the capacity meeting of battery system
It is quick to reduce；For new-energy automobile, it means that the distance travelled of driven by power can be reduced quickly, in the limiting case, this
Mean that this battery system needs to safeguard or even scrap.
And the equilibrium of battery cell voltage is mainly based upon to battery balanced algorithm in the prior art；In the method due to
Battery cell voltage can be obtained with direct measurement, therefore the equilibrium based on voltage is most readily achieved, so being also generally to adopt
With；This method often when battery system is in charging or static condition, is switched by using equalizing resistance and one, right
Battery cell or battery pack string with high voltage are discharged；This method is often each in same battery system
The voltage of battery cell or battery pack string tends to identical as equalization target, so using battery cell or battery pack string
Whether voltage is as main basis for estimation, to needing to judge the progress equilibrium of this battery cell.
Under the enough situations of time for balance, the equilibrium based on battery cell voltage can be the battery cell in battery system
It is balanced to same voltage class；And these battery cells show as voltage when standing and are in same grade, it appears that seem
It is equalized result；But, this method did not considered battery cell otherness production in actual use fundamentally
The reason for raw, and equalization methods are designed from the angle of battery cell otherness；In same battery system, different battery cells
Initial capacity and initial internal resistance be different；The self-discharge rate of each battery cell is also different simultaneously；And in reality
In use, the working environment of each battery cell is also different, it means that in actual use the capacity of battery cell and
Internal resistance can constantly change in ageing process；These factors and some other factor, cause different electricity in same battery system
Pond monomer otherness, includes the difference of battery cell capacity, internal resistance and self-discharge rate etc..
And in actual use, the shortcoming in a balanced way based on battery cell voltage mainly has：1）It is balanced past based on voltage
Same voltage class is in as equalization target toward using the battery cell in battery system, but sometime identical voltage etc.
Level and be equal battery cell electrochemical properties such as monomer capacity it is identical with monomer internal resistance；This means this method is only concerned
The external voltage of battery cell rather than the electrochemical properties of lithium battery；2）Equilibrium based on battery cell voltage passes through measurement
Voltage selection is needed by battery cell in a balanced way, but judges to need monomer in a balanced way by voltage, in judge next time
It is likely to become and does not need monomer in a balanced way, and currently judge not needing monomer in a balanced way, may also becomes in judge next time
Need monomer in a balanced way；This means this method is sometimes ego dystonic, and balanced judge to tend not to really needing
Battery cell to choose in a balanced way；3）Equilibrium based on battery cell voltage, which is often designed to be in battery system, fills
Equilibrium is carried out under electricity or static condition, because this method thinks that high-tension battery cell means height in the discharged condition
Needs can not be picked out by battery list in a balanced way in SOC (State Of Charge) or more dump energies, discharge process
Body；It can be carried out the time in a balanced way this means this method is limited in practical application, this method does not support battery typically
The full-time equilibrium of system；4）When battery system is in charging initial stage, the voltage of some battery cells is often than other batteries electricity
Pressure is high, but having arrived charging post situation may change, and the phase may voltage after charging for the relatively low battery cell of voltage before
Higher, this is often that battery cell capacity is inconsistent caused, it means that the equilibrium based on battery cell voltage is preferably being filled
Carried out under electric later stage or static condition.Which also limits can be carried out the time in a balanced way in practical application, meanwhile, if quiet
Carry out equilibrium under configuration state to increase time for balance, this also means that adding the time for maintaining whole system work and energy consumption；
5）When battery system is in charged state, the equilibrium based on battery cell voltage does not consider the otherness of battery cell internal resistance,
The terminal voltage of battery cell in the case of direct current charge-discharge can using approximate calculation as Vt=Vocv+I*Rdc (Vt represent end electricity
Pressure；Vocv is open-circuit voltage of the battery cell under current state；I is charging and discharging currents, is charged as on the occasion of discharging for negative value；
Rdc is the DC internal resistance of battery cell or battery pack string)；If this means the DC internal resistance of battery cell be it is different,
So the terminal voltage of battery cell or battery pack string not only depends not only on open-circuit voltage Vocv in actual use, also depends on
In DC internal resistance Rdc and charging and discharging currents I, this also means that the higher battery cell of voltage in the charge state, is standing shape
Possible voltage is not higher under state, because charging current I and the internal resistance of cell I presence；Moreover, even in same charge and discharge
In electricity circulation, the DC internal resistance Rdc of battery cell is not nor a fixed value, in same circulation, same battery cell is
DC internal resistance Rdc during with SOC is also different, and the equilibrium based on battery cell voltage is not the DC internal resistance of battery cell
Take into account, probability in a balanced way is needed which increase false judgment；6）Equilibrium based on battery cell voltage is in the charge state
Or under static condition, often using charge cutoff voltage or stand voltage as equalization target, then, battery cell it is initial
Capacity is simultaneously differed, and monomer capacity volume variance this in actual use can be increasing；If all in battery system
Monomer has been balanced to same voltage class, under discharge condition next time, and the less battery cell of Capacity Ratio usually can be very fast
Lower threshold voltage is reached, meanwhile, the larger battery cell of capacity will not reach lower threshold voltage；This phenomenon actually makes
Very common in, this shows that the larger battery cell of capacity or battery pack string are usually operated in SOC windows in actual use
Mouth [SOC_Low, SOC_High], wherein SOC_High can usually reach the SOC high thresholds of battery system（Usually from
100%）, but SOC_Low is usually than the SOC threshold ones of battery system（Usually from 0%）It is high；But, in actual use, electricity
The best effort SOC windows of pond monomer or battery pack string are not from SOC high thresholds to a relatively low value；Based on battery
The equilibrium of monomer voltage does not have the difference for considering battery cell capacity, and does not consider lithium battery monomer best effort
SOC windows, it means that the equilibrium based on battery cell voltage does not have the economy for considering battery system, such as battery system
In the life-span, safeguard and recycle.
The content of the invention
The purpose of the present invention is to provide a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity, make
Each battery cell cell operation is come in SOC windows of the target SOC as median for calculating or setting in battery system
Realize the longer service life of battery cell unit and Geng Gao equalization efficiency.
The present invention is achieved through the following technical solutions：A kind of equilibrium based on lithium-ion battery monomer SOC and monomer capacity
Method, step is as follows：
Step a）The current capacities of each battery cell unit in battery system are detected, and draw the minimum battery list of current capacities
Body unit；
Step b）For the battery in target battery system, target SOC is used as using target SOC set in advance；
Step c）Calculate the current state-of-charge SOC of each battery cell unit and target SOC difference, i.e. difference=electricity
The current state-of-charge SOC-target SOC of pond monomeric unit；And it also requires calculating the minimum battery cell unit of current capacities
Battery cell unit-target the SOC minimum with target SOC lowest difference value, i.e. lowest difference value=current capacities；
Step d）By the current capacities of difference and each battery cell unit calculate current each battery cell unit with
The difference electricity differed between target SOC；That is current capacities of difference electricity=difference * battery cell units；And calculate and work as
The lowest difference value electricity of the minimum battery cell unit of preceding capacity and target SOC, i.e. lowest difference value electricity=lowest difference value * are current
The minimum battery cell unit of capacity；
Step e）Using the difference electricity calculated and lowest difference value electricity as input, judged by comparing both sizes
It is to be equalized whether each battery cell unit needs, to realize that each battery cell unit is operated in using target SOC as centre
In the SOC windows of value；If the value that difference electricity subtracts lowest difference value electricity is more than target electricity difference, this battery list is opened
The equilibrium of body unit；Required battery cell in a balanced way is calculated simultaneously also by the difference of difference electricity and lowest difference value electricity
The time for balance of unit needs is simultaneously used for balanced output control；If the value that difference electricity subtracts lowest difference value electricity is more than target electricity
During amount difference, then time for balance={ difference electricity-lowest difference value electricity-target electricity is poor }/euqalizing current is calculated；
Step f）Step a is returned to be circulated next time.
Preferably, target SOC is the median of SOC windows in the step b, target SOC can also in the step b
Between the 45% to 60% of battery cell cell capability, to ensure that battery is operated in SOC windows, realize that battery cell is longer
Service life or higher equalization efficiency.
Preferably, the battery cell unit is battery cell or battery pack string, for reducing battery otherness.
Preferably, can also be calculated in the step a each battery cell unit SOC and monomer internal resistance in order to
More accurately calculate the current capacities of each battery cell unit.
Preferably, target electricity difference is value set in advance or 0, convenient use person's sets itself mesh in the step e
Mark electricity difference is poor come the electricity for judging each current battery cell or battery pack string and its target SOC, with target battery list
Whether body or the battery pack string difference poor with its target SOC electricity are within allowed band, if it exceeds this scope is then
It is contemplated that opening the equilibrium of this battery cell or battery pack string.
Preferably, once uniformly being completed when time for balance is implemented in the step e, can also gradually it complete step by step；Protect
Card user can flexibly set the mode of time for balance completion, improve equalization efficiency and avoid missing balanced simultaneously.
The present invention can flexibly set the work of each battery cell unit in battery system by sets target SOC
SOC windows, and judged by balanced from the point of view of battery parameter, improve equalization efficiency avoid simultaneously it is by mistake balanced.And
Target electricity difference be then used to specifically judging each battery cell or battery pack string and target battery monomer electricity difference whether
Within allowed band, if it exceeds this scope then can contemplate unlatching equilibrium；Thus make each electricity in battery system
Pond monomeric unit is operated in most suitable SOC windows, realizes the longer service life of battery cell unit and Geng Gao balanced effect
Rate, can improve the economy of battery system.
Compared with prior art, the present invention is advantageous in that：1）It is to be based on each electricity in battery system to take equilibrium
The SOC and current capacities of pond monomeric unit calculate judgement, improve accuracy；2）By to each battery cell in battery system
The unit battery cell unit minimum with current capacities is compared, and uses the battery cell unit that current capacities in battery system are minimum
As balanced foundation, judge whether each battery cell unit needs equilibrium, and improve equalization efficiency and extension battery system
Life-span；3）Target SOC is either to calculate mesh using authenticated computational methods by using the target SOC setting values of checking
SOC value is marked, for being used as the median of the work SOC windows of each battery cell unit；4）Sentenced using target electricity difference
The electricity of disconnected current each battery cell unit and its target SOC is poor, with target battery monomeric unit and its target SOC electricity
Whether the difference of difference is within allowed band, if it exceeds this scope, which then can contemplate, opens this battery cell or unit
It is balanced；5）Each battery cell unit is respectively arranged with target SOC and work SOC windows, realizes each battery cell unit
All it is operated in each optimal SOC windows；6）The estimation balanced time needed, with each current battery cell or battery
The electricity of group string and its target SOC is poor, the difference with the electricity difference of target battery monomer or battery pack string and its target SOC,
The difference that subtraction is obtained, divided by euqalizing current are carried out with target electricity difference to calculate the total of current this battery cell equilibrium needs
The body time.
Embodiment
With reference to, embodiment, the invention will be further described：One kind is based on lithium-ion battery monomer SOC
With the equalization methods of monomer capacity, step is as follows：
Step a）The current capacities Celln_Cap of each battery cell unit in battery system is detected, and draws current capacities most
Low battery cell unit Cell_Cap_Min；
Step b）For the battery in target battery system, target SOC Cell_ are used as using target SOC set in advance
Target_SOC；
Step c）Calculate the current state-of-charge SOC Celln _ SOC and target SOC Cell_ of each battery cell unit
The current charged shape of Target_SOC difference Celln _ SOC_Diff, i.e. difference Celln _ SOC_Diff=battery cells unit
State SOC Celln _ SOC-target SOC Cell_Target_SOC；And it also requires calculating the minimum battery list of current capacities
Body unit Cell_Cap_Min and target SOC Cell_Target_SOC lowest difference value Cell_SOC_Diff_Target, i.e.,
The minimum battery cell unit Cell_Cap_Min-target SOC of lowest difference value Cell_SOC_Diff_Target=current capacities
Cell_Target_SOC；
Step d）Calculated by difference Celln_SOC_Diff and each battery cell unit current capacities Celln_Cap
Current each difference electricity Celln_Q_Diff differed between battery cell unit and target SOC Cell_Target_SOC；
That is the current capacities Celln_Cap of difference electricity Celln_Q_Diff=differences Celln_SOC_Diff* battery cell units；And
And calculate the minimum of current capacities minimum battery cell unit Cell_Cap_Min and target SOC Cell_Target_SOC
Difference electricity Celln_Q_Diff_Target, i.e. lowest difference value electricity Celln_Q_Diff_Target=lowest difference values Cell_
The minimum battery cell unit Cell_Cap_Min of SOC_Diff_Target* current capacities；
Step e）The difference electricity Celln_Q_Diff calculated and lowest difference value electricity Celln_Q_Diff_Target is made
For input, judge whether each battery cell unit needs by comparing both sizes to be equalized, to realize each battery
Monomeric unit is all operated in the SOC windows using target SOC Cell_Target_SOC as median；If difference electricity Celln_
The value that Q_Diff subtracts lowest difference value electricity Celln_Q_Diff_Target is more than target electricity difference Celln_Target_ Q_
During Diff, then the equilibrium of this battery cell unit is opened；Simultaneously also by difference electricity Celln_Q_Diff and lowest difference value
Electricity Celln_Q_Diff_Target difference is used in combination come the time for balance that battery cell unit needs in a balanced way required for calculating
In balanced output control；If difference electricity Celln_Q_Diff subtracts lowest difference value electricity Celln_Q_Diff_Target value
During Celln_Target_ Q_Diff poor more than target electricity, then calculating time for balance t=, { difference electricity Celln_Q_Diff- is most
Low difference electricity Celln_Q_Diff_Target- targets electricity difference Celln_Target_ Q_Diff }/euqalizing current I；
Step f）Step a is returned to be circulated next time.
In present embodiment, target SOC Cell_Target_SOC are the median of SOC windows in the step b；It is described
In step b target SOC Cell_Target_SOC for battery cell cell capability 45% to 60% between；The battery cell list
Member is battery cell；The battery cell unit is battery pack string；Each battery cell list can also be calculated in the step a
The SOC Celln_SOC and monomer internal resistance Celln_DCIR of member are in order to calculating；Target electricity difference Celln_ in the step e
Target_ Q_Diff are value set in advance；Target electricity difference Celln_Target_ Q_Diff are 0 in the step e；Institute
State and once uniformly completed when time for balance t is implemented in step e；Substep is gradually completed when time for balance t is implemented in the step e.
In present embodiment, the target SOC can be phase for each battery cell unit in each battery system
Can also be different values with value, for adapting to otherness not by battery cell unit.
In present embodiment, this method is to carry out equilibrium based on lithium-ion battery monomer cell S OC and monomer capacity, is one
The equalization methods based on lithium battery chemical characteristic are planted, by considering battery cell cell S OC and battery cell capacity, to lithium electricity
Pond carries out balanced；This method mainly considers that the SOC and battery cell capacity of battery cell unit enter as major consideration
Row is balanced to be judged, while being also used to calculate battery cell SOC in the internal resistance of battery cell unit；It is every in battery system by calculating
The electrochemical state of one battery cell unit, this method can realize full-time equilibrium, and improve the accuracy of balanced judgement；
This method can improve the economy of battery system in actual use by the flexible calculating of SOC windows simultaneously；And battery system
The capacity of system then depends on the current battery cell unit with minimum capacity in battery system, based on lithium-ion battery monomer list
The equalization methods of first SOC and monomer capacity are by setting up a kind of side for making each battery cell cell operation in optimal SOC windows
Method, to extend the service life of battery cell or battery pack string, while improving equalization efficiency.
In present embodiment, battery system can be to each battery cell unit in system and the battery with lowest capacity
Monomeric unit Cell_Cap_Min is compared, so as to judge whether each battery cell unit for comparing completion needs
Weighing apparatus, and improve efficiency in a balanced way and extension cell system lifetime.
In present embodiment, battery system calculates SOC Celln_SOC and the monomer internal resistance of each battery cell unit
Celln_DCIR, and the current capacities Celln_Cap of each battery cell unit is calculated, and find out with lowest capacity
Battery cell unit Cell_Cap_Min；Then for the battery in target battery system, the current of battery cell unit is used
The 50% of capacity C elln_Cap is used as its target SOC Cell_Target_SOC, then calculates each battery cell unit
Current state-of-charge SOC Celln_SOC and target SOC Cell_Target_SOC difference Celln _ SOC_Diff, and
Go out the lowest difference value Cell_SOC_Diff_ of the minimum battery cell unit of current capacities and target SOC Cell_Target_SOC
Target；Then calculate differed between each battery cell unit and target SOC Cell_Target_SOC difference electricity
Celln_Q_Diff is measured, for the battery cell unit that current capacities are minimum, itself and target SOC Cell_ is also calculated
Lowest difference value electricity Celln_Q_Diff_Target between Target_SOC, then by the difference electricity calculated
Celln_Q_Diff and lowest difference value electricity Celln_Q_Diff_Target as inputting and calculate the difference between them, if
The value that difference electricity Celln_Q_Diff subtracts lowest difference value electricity Celln_Q_Diff_Target is poor more than target electricity
Cell_Target_Q_Diff value 0, it is possible to open the equilibrium of this battery cell unit, but needed for calculate simultaneously in a balanced way
Time for balance t, time for balance（t）=（Difference electricity Celln_Q_Diff- lowest difference value electricity Celln_Q_Diff_Target-
Target electricity difference Celln_Target_ Q_Diff）/ euqalizing current I, and directly once complete required electric in time for balance t
The equilibrium of pond monomeric unit, completes equalization operation, and then repetitive cycling is operated, and is sentenced to ensure full-time equilibrium, and improve equilibrium
Disconnected accuracy, each battery cell unit of volume is operated in optimal SOC windows, to extend the use longevity of battery cell unit
Life, while improving equalization efficiency.
In present embodiment, the size for the euqalizing current that euqalizing current I calculates for battery system, the n=in Celln
1, 2, 3, … , Max Cell Number；Cell then represents the battery cell unit in battery system；Target SOC
Cell_Target_SOC is then setting value by checking, preferably 50% or SOC windows median, but target
SOC Cell_Target_SOC can be identical value for each battery cell unit in same battery system, can also
Different values, because each battery cell unit can otherness depending on；Lowest difference value electricity Celln_Q_Diff_Target is then
It is poor for target electricity, can be 0 or a value set in advance.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
It is defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within the present invention's
Protection domain.
Claims (10)
1. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity, it is characterised in that step is as follows：
Step a）Detect the current capacities of each battery cell unit in battery system（Celln_Cap）, and draw current capacities
Minimum battery cell unit（Cell_Cap_Min）；
Step b）For the battery in target battery system, target SOC is used as using target SOC set in advance（Cell_
Target_SOC）；
Step c）Calculate the current state-of-charge SOC of each battery cell unit（Celln _SOC）With target SOC
（Cell_Target_SOC）Difference（Celln _SOC_Diff）, i.e. difference（Celln _SOC_Diff）=battery cell unit
Current state-of-charge SOC（Celln _SOC）- target SOC（Cell_Target_SOC）；And it also requires calculating current capacities
Minimum battery cell unit（Cell_Cap_Min）With target SOC（Cell_Target_SOC）Lowest difference value（Cell_
SOC_Diff_Target）, i.e. lowest difference value（Cell_SOC_Diff_Target）The minimum battery cell unit of=current capacities
（Cell_Cap_Min）- target SOC（Cell_Target_SOC）；
Step d）Pass through difference（Celln_SOC_Diff）With the current capacities of each battery cell unit（Celln_Cap）Calculate
Draw current each battery cell unit and target SOC（Cell_Target_SOC）Between the difference electricity that differs（Celln_Q_
Diff）；That is difference electricity（Celln_Q_Diff）=difference（Celln_SOC_Diff）* current capacities of battery cell unit
（Celln_Cap）；And calculate the minimum battery cell unit of current capacities（Cell_Cap_Min）With target SOC（Cell_
Target_SOC）Lowest difference value electricity（Celln_Q_Diff_Target）, i.e. lowest difference value electricity（Celln_Q_Diff_
Target）=lowest difference value（Cell_SOC_Diff_Target）* the minimum battery cell unit of current capacities（Cell_Cap_
Min）；
Step e）By the difference electricity calculated（Celln_Q_Diff）With lowest difference value electricity（Celln_Q_Diff_
Target）As input, judge whether each battery cell unit needs by comparing both sizes to be equalized, to realize
Each battery cell unit is operated in target SOC（Cell_Target_SOC）For in the SOC windows of median；If difference
Electricity（Celln_Q_Diff）Subtract lowest difference value electricity（Celln_Q_Diff_Target）Value be more than target electricity it is poor
（Celln_Target_ Q_Diff）When, then open the equilibrium of this battery cell unit；Simultaneously also by difference electricity
（Celln_Q_Diff）With lowest difference value electricity（Celln_Q_Diff_Target）Difference come battery in a balanced way required for calculating
The time for balance of monomeric unit needs is simultaneously used for balanced output control；If difference electricity（Celln_Q_Diff）Subtract lowest difference value
Electricity（Celln_Q_Diff_Target）Value be more than target electricity it is poor（Celln_Target_ Q_Diff）When, then calculate equal
The weighing apparatus time（t）={ difference electricity（Celln_Q_Diff）- lowest difference value electricity（Celln_Q_Diff_Target）- target electricity
Difference（Celln_Target_ Q_Diff）}/euqalizing current（I）；
Step f）Step a is returned to be circulated next time.
2. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：Target SOC in the step b（Cell_Target_SOC）For the median of SOC windows.
3. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：Target SOC in the step b（Cell_Target_SOC）Between the 45% to 60% of battery cell cell capability.
4. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：The battery cell unit is battery cell.
5. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：The battery cell unit is battery pack string.
6. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：The SOC of each battery cell unit can also be calculated in the step a（Celln_SOC）With monomer internal resistance（Celln_
DCIR）In order to calculate.
7. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：Target electricity is poor in the step e（Celln_Target_ Q_Diff）For value set in advance.
8. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：Target electricity is poor in the step e（Celln_Target_ Q_Diff）For 0.
9. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, its feature
It is：Time for balance in the step e（t）Once uniformly completed during implementation.
10. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, it is special
Levy and be：Time for balance in the step e（t）Substep is gradually completed during implementation.
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| CN110015129A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN114006063A (en) * | 2021-11-02 | 2022-02-01 | 轻橙时代(深圳)科技有限责任公司 | Balanced control method for lithium iron phosphate battery of pure electric vehicle |
| CN114742447A (en) * | 2022-04-26 | 2022-07-12 | 哈尔滨理工大学 | Estimation method and device for echelon utilization evaluation index of single battery and energy storage battery system |
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| CN114742447A (en) * | 2022-04-26 | 2022-07-12 | 哈尔滨理工大学 | Estimation method and device for echelon utilization evaluation index of single battery and energy storage battery system |
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