CN106953394B - 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
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Abstract
The present invention discloses a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity, by setting target SOC, the SOC window of the work of each battery cell unit in battery system can be flexibly set, and is judged by balanced from the point of view of battery parameter, improve equalization efficiency while avoided accidentally balanced.And target electricity difference is then used to specifically judge the electricity difference of each battery cell or battery pack string and target battery monomer whether within allowed band, if it exceeds that unlatching then can be considered is balanced for this range；Thus make each battery cell cell operation in battery system in most suitable SOC window, realizes the longer service life of battery cell unit and higher equalization efficiency, the economy of battery system can be improved.
Description
Technical field
The present invention relates to battery technology fields, and in particular to a kind of based on lithium-ion battery monomer SOC and monomer capacity
Equalization methods.
Background technique
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 by battery cell series, parallel or pass through certain series-parallel combination shape
At battery system, enough power and energy are provided to meet the requirement of its power and course continuation mileage to electric car；If electric
Difference is not present between the monomer of pond in practical applications, then the battery pack of electric car and battery cell are in service life and safety
It is consistent in property；But in practical applications, inconsistent due to manufacturing process and use process environment, it is total between battery cell
Be that there are inconsistencies, and due in actual use degree of aging and state it is 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 preferably must be held within the scope of safe voltage, that is, be lower than high safety voltage threshold when charging, and lower security is higher than when electric discharge
Voltage threshold.But in the practical application of more than one battery pack string, due to need to guarantee each battery cell or
Battery pack string works within the scope of safe voltage, the otherness and voltage difference opposite sex meeting of different battery cells or battery pack string
The use voltage range of limitation battery system really；This means that with the expansion of battery otherness, the capacity meeting of battery system
Quickly reduce；For new-energy automobile, it means that the mileage travelled being driven by electricity can be reduced quickly, in the limiting case, this
Mean that this battery system needs to safeguard even to 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 directly measure to obtain, 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 discharge；This method is often each of same battery system
Perhaps the voltage of battery pack string tends to identical and is used as equalization target so using battery cell or battery pack string battery cell
Whether voltage is as main judgment basis, to needing to carry out equilibrium to this battery cell to judge.
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 there is no fundamentally considered battery cell otherness production in actual use for this method
Raw reason, 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, the difference comprising battery cell capacity, internal resistance and self-discharge rate etc..
And in actual use, the balanced disadvantage based on battery cell voltage mainly has: 1) equilibrium based on voltage is past
Same voltage class is in as equalization target toward using the battery cell in battery system, but sometime identical voltage etc.
Grade and be equal battery cell electrochemical properties such as monomer capacity it is identical with monomer internal resistance；This means that 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 needs battery cell to be equalized, but judges to need balanced monomer by voltage, in judgement next time
It is likely to become and does not need balanced monomer, and currently judge not needing balanced monomer, may also become in judgement next time
Need balanced monomer；This means that this method is sometimes ego dystonic, and balanced judgement tends not to need real
Balanced battery cell is wanted to choose；3) equilibrium based on battery cell voltage is often designed to be in battery system and fill
Equilibrium is carried out under electricity or static condition, because this method thinks that the battery cell of high voltage in the discharged condition means height
SOC (State Of Charge) or more remaining capacities, can not pick out in discharge process needs battery list to be equalized
Body；This means that this method, which limits, can carry out the balanced time in practical application, this method does not support battery generally
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 lower battery cell of voltage before
Higher, this is often caused by battery cell capacity is inconsistent, it means that the equilibrium based on battery cell voltage is preferably being filled
It is carried out under electric later period or static condition.Which also limits the times that equilibrium can be carried out in practical application, meanwhile, if quiet
It sets and carries out equilibrium under state to increase time for balance, this also means that increasing 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 end voltage of battery cell in the case where direct current charge-discharge can with approximate calculation for Vt=Vocv+I*Rdc (Vt indicate end electricity
Pressure；Vocv is open-circuit voltage of the battery cell under current state；I is charging and discharging currents, is charged as positive value, is discharged for negative value；
Rdc is the DC internal resistance of battery cell or battery pack string)；This means that if the DC internal resistance of battery cell is different,
So the end 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 of the presence of charging current I and internal resistance of cell I；Moreover, even if in the same charge and discharge
In electricity circulation, the DC internal resistance Rdc of battery cell is also not a fixed value, and in same circulation, same battery cell is not
It is also different with DC internal resistance Rdc when SOC, the equilibrium based on battery cell voltage is not the DC internal resistance of battery cell
It takes into account, balanced probability is needed which increase false judgment；6) based on battery cell voltage it is balanced in the charge state
Perhaps under static condition often using charge cutoff voltage or stand voltage as equalization target, then, battery cell it is initial
Capacity is not identical, 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, and under discharge condition next time, the smaller battery cell of capacity usually can be very fast
Lower threshold voltage is reached, meanwhile, the biggish battery cell of capacity will not reach lower threshold voltage；This phenomenon actually makes
Very common in, this shows that the biggish battery cell of capacity or battery pack string are usually worked in actual use in SOC window
Mouth [SOC_Low, SOC_High], wherein SOC_High can usually reach the SOC high threshold of battery system (usually from
100%), but SOC_Low is usually higher than the SOC threshold ones of battery system (usually from 0%)；But in actual use, electric
The best effort SOC window of pond monomer or battery pack string is not from SOC high threshold to a lower value；Based on battery
The balanced difference for not considering battery cell capacity of monomer voltage, and there is no consider lithium battery monomer best effort
SOC window, it means that the balanced economy for not considering battery system based on battery cell voltage, such as battery system
Service life safeguards and recycles.
Summary of the invention
The purpose of the present invention is make to provide a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity
Each battery cell cell operation is in SOC window of the target SOC as median for calculating or setting in battery system,
Realize the longer service life of battery cell unit and higher equalization efficiency.
The invention is realized by the following technical scheme: a kind of equilibrium based on lithium-ion battery monomer SOC and monomer capacity
Method, steps are as follows:
Step a) detects the current capacities of each battery cell unit in battery system, and obtains the minimum electricity of current capacities
Pond monomeric unit；
Step b) uses preset target SOC as target SOC for the battery in target battery system；
The difference of current the state-of-charge SOC and target SOC of each battery cell unit, i.e. difference is calculated in step c)
The current state-of-charge SOC-target SOC of=battery cell unit；And it also requires calculating the minimum battery cell list of current capacities
The lowest difference value of member and target SOC, the i.e. minimum battery cell unit-target SOC of lowest difference value=current capacities；
Current each battery cell list is calculated by the current capacities of difference and each battery cell unit in step d)
Member and the difference electricity that is differed between target SOC；That is difference electricity=difference * battery cell unit current capacities；And it calculates
The lowest difference value electricity of current capacities minimum battery cell unit and target SOC, i.e. lowest difference value electricity=lowest difference value * out
The minimum battery cell unit of current capacities；
Step e) is come using the difference electricity being calculated and lowest difference value electricity as input by comparing the size of the two
It is to be equalized to judge whether each battery cell unit needs, is being with target SOC to realize that each battery cell unit works
In the SOC window of median；If the value that difference electricity subtracts lowest difference value electricity is greater than target electricity difference, this electricity is opened
The equilibrium of pond monomeric unit；The battery of equilibrium required for being calculated simultaneously also by the difference of difference electricity and lowest difference value electricity
The time for balance of monomeric unit needs is simultaneously controlled for balanced output；If the value that difference electricity subtracts lowest difference value electricity is greater than mesh
When marking electricity difference, then time for balance={ difference electricity-lowest difference value electricity-target electricity is poor }/euqalizing current is calculated；
Step f) returns to step a and is recycled next time.
Preferably, target SOC is the median of SOC window in the step b, target SOC can also be in the step b
Between the 45% to 60% of battery cell cell capability, to guarantee that battery work in SOC window, realizes 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 SOC and the monomer internal resistance of each battery cell unit in order to
More accurately calculate the current capacities of each battery cell unit.
Preferably, target electricity difference is preset value or 0 in the step e, convenient for users to sets itself mesh
Mark electricity difference is poor to judge each current battery cell or battery pack string and the electricity of its target SOC, with target battery list
Whether the difference of the electricity difference of body or battery pack string and its target SOC is within allowed band, if it exceeds this range is then
It is contemplated that opening the equilibrium of this battery cell or battery pack string.
It once uniformly completes, can also be gradually completed when preferably, time for balance being implemented in the step e step by step；It protects
Card user can flexibly set the mode of time for balance completion, improve equalization efficiency while avoiding accidentally balanced.
The present invention can flexibly set the work of each battery cell unit in battery system by setting target SOC
SOC window, and judged by balanced from the point of view of battery parameter, improve equalization efficiency avoid simultaneously it is accidentally balanced.And
Target electricity difference be then used to specifically judge each battery cell or battery pack string and target battery monomer electricity difference whether
Within allowed band, if it exceeds unlatching equilibrium then can be considered in this range；Thus make each electricity in battery system
Monomeric unit work in pond realizes the longer service life of battery cell unit and higher balanced effect in most suitable SOC window
The economy of battery system can be improved in rate.
Compared with prior art, the invention has the beneficial effects that: 1) taking equilibrium is based on each electricity in battery system
The SOC and current capacities of pond monomeric unit judge to calculate, and improve accuracy；2) by battery cell each in battery system
Compared with the unit battery cell unit minimum with current capacities, the battery cell unit that current capacities in battery system are minimum is used
As balanced foundation, judge whether each battery cell unit needs equilibrium, and improves equalization efficiency and extend battery system
Service life；3) target SOC is either to calculate mesh using authenticated calculation method by using the target SOC setting value of verifying
SOC value is marked, to be used as the median of the work SOC window 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, the electricity with target battery monomeric unit and its target SOC
Whether the difference of difference is within allowed band, if it exceeds this range, which then can be considered, opens this battery cell or unit
It is balanced；5) each battery cell unit is respectively arranged with target SOC and work SOC window, realizes each battery cell unit
It all works in respective optimal SOC window；6) the estimation balanced time needed, with each current battery cell or battery
Group string is poor with the electricity of its target SOC, the difference with the electricity difference of target battery monomer or battery pack string and its target SOC,
The difference that subtraction obtains is carried out with target electricity difference, the total of current this battery cell equilibrium needs is calculated divided by euqalizing current
The body time.
Specific embodiment
Below with reference to, specific embodiment, the invention will be further described: one kind being based on lithium-ion battery monomer SOC
With the equalization methods of monomer capacity, steps are as follows:
Step a) detects the current capacities Celln_Cap of each battery cell unit in battery system, and obtains current appearance
Measure minimum battery cell unit Cell_Cap_Min；
Step b) uses preset target SOC as target SOC Cell_ for the battery in target battery system
Target_SOC；
The current state-of-charge SOC Celln _ SOC and target SOC of each battery cell unit is calculated in step c)
Difference Celln _ SOC_Diff of Cell_Target_SOC, i.e. difference Celln _ SOC_Diff=current lotus of battery cell unit
Electricity condition SOC Celln _ SOC-target SOC Cell_Target_SOC；And it also requires calculating the minimum electricity of current capacities
The lowest difference value Cell_SOC_Diff_ of pond monomeric unit Cell_Cap_Min and target SOC Cell_Target_SOC
The minimum battery cell unit Cell_Cap_Min-of Target, i.e. lowest difference value Cell_SOC_Diff_Target=current capacities
Target SOC Cell_Target_SOC；
Step d) is calculated by the current capacities Celln_Cap of difference Celln_SOC_Diff and each battery cell unit
Obtain the difference electricity Celln_Q_ differed between current each battery cell unit and target SOC Cell_Target_SOC
Diff；That is difference electricity Celln_Q_Diff=difference Celln_SOC_Diff* battery cell unit current capacities Celln_
Cap；And calculate current capacities minimum battery cell unit Cell_Cap_Min and 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
The minimum battery cell unit Cell_Cap_Min of Cell_SOC_Diff_Target* current capacities；
Step e) is by the difference electricity Celln_Q_Diff being calculated and lowest difference value electricity Celln_Q_Diff_
Target judges whether each battery cell unit needs to be equalized, Lai Shixian by comparing the size of the two as input
Each battery cell unit works in the SOC window using target SOC Cell_Target_SOC as median；If difference is electric
The value that amount Celln_Q_Diff subtracts lowest difference value electricity Celln_Q_Diff_Target is greater than target electricity difference Celln_
When Target_ Q_Diff, then the equilibrium of this battery cell unit is opened；Simultaneously also by difference electricity Celln_Q_Diff
What the battery cell unit of equilibrium needed required for calculating with the difference of lowest difference value electricity Celln_Q_Diff_Target is equal
The weighing apparatus time simultaneously controls for balanced output；If difference electricity Celln_Q_Diff subtracts lowest difference value electricity Celln_Q_Diff_
When the value of Target is greater than target electricity difference Celln_Target_ Q_Diff, then time for balance t={ difference electricity is calculated
Celln_Q_Diff- lowest difference value electricity Celln_Q_Diff_Target- target electricity difference Celln_Target_ Q_Diff }/
Euqalizing current I；
Step f) returns to step a and is recycled next time.
In present embodiment, target SOC Cell_Target_SOC is the median of SOC window in the step b；It is described
Target SOC Cell_Target_SOC is between the 45% to 60% of battery cell cell capability in step b；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 is preset value；Target electricity difference Celln_Target_ Q_Diff is 0 in the step e；Institute
It states and is 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
It is also possible to different values with value, to be used to adapt to do not pass through the otherness of battery cell unit.
In present embodiment, it is one that this method, which is to carry out equilibrium based on lithium-ion battery monomer cell S OC and monomer capacity,
Equalization methods of the kind based on lithium battery chemical characteristic, by considering battery cell cell S OC and battery cell capacity, to lithium electricity
Pond carries out balanced；This method mainly consider battery cell unit SOC and battery cell capacity as major consideration into
The balanced judgement of row, 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
Full-time equilibrium may be implemented in the electrochemical state of one battery cell unit, this method, and improves the accuracy of balanced judgement；
This method passes through the flexible calculating of SOC window simultaneously, can improve the economy of battery system in actual use；And battery system
The capacity of system then depends in battery system being based on lithium-ion battery monomer list currently with the battery cell unit of minimum capacity
The equalization methods of first SOC and monomer capacity are by establishing a kind of side for making each battery cell cell operation in best SOC window
Method, the service life of Lai Yanchang 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, to judge that each compares whether the battery cell unit of completion needs
Weighing apparatus, and improve balanced efficiency and extend 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
Then the 50% of capacity C elln_Cap calculates each battery cell unit as its target SOC Cell_Target_SOC
Difference Celln _ SOC_Diff of current state-of-charge SOC Celln_SOC and target SOC Cell_Target_SOC, and
The lowest difference value Cell_SOC_Diff_ of current capacities minimum battery cell unit and target SOC Cell_Target_SOC out
Target；Then the difference electricity differed between each battery cell unit and target SOC Cell_Target_SOC is being calculated
Celln_Q_Diff is measured, battery cell unit the smallest for current capacities also calculates itself and target SOC Cell_
Lowest difference value electricity Celln_Q_Diff_Target between Target_SOC, the difference electricity that then will be calculated
Celln_Q_Diff and lowest difference value electricity Celln_Q_Diff_Target is as input and calculates the difference between them, if
It is poor that the value that difference electricity Celln_Q_Diff subtracts lowest difference value electricity Celln_Q_Diff_Target is greater than target electricity
The value 0 of Cell_Target_Q_Diff, so that it may open the equilibrium of this battery cell unit, but calculate required equilibrium simultaneously
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 the electricity needed for directly primary completion in time for balance t
Equalization operation is completed in the equilibrium of pond monomeric unit, and then repetitive cycling operates, and to guarantee full-time equilibrium, and is improved equilibrium and is sentenced
Disconnected accuracy, each battery cell unit of volume work in best SOC window, and Lai Yanchang battery cell unit uses the longevity
Life, while improving equalization efficiency.
In present embodiment, euqalizing current I is the size for the euqalizing current that battery system is calculated, 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 a setting value by verifying, preferably 50% or SOC window median, but target
SOC Cell_Target_SOC can be identical value for each battery cell unit in same battery system, can also be with
Be different value, 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, it can be 0 or a preset value.
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
Subject to, replacement, deformation, the improvement that those skilled in the art that any pair of this technology is made is readily apparent that each fall within of the invention
Protection scope.
Claims (9)
1. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity, which is characterized in that steps are as follows:
Step a) detects the current capacities (Celln_Cap) of each battery cell unit in battery system, and obtains current capacities
Minimum battery cell unit (Cell_Cap_Min)；
Step b) uses preset target SOC as target SOC(Cell_ for the battery in target battery system
Target_SOC)；
Current state-of-charge SOC(Celln _ SOC of each battery cell unit is calculated in step c)) and 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
The current state-of-charge and target SOC(Cell_Target_SOC of minimum battery cell unit (Cell_Cap_Min)) most
Low difference (Cell_SOC_Diff_Target), i.e. lowest difference value (Cell_SOC_Diff_Target)=current capacities are minimum
Current state-of-charge-target SOC(Cell_Target_SOC of battery cell unit (Cell_Cap_Min))；
Step d) is calculated by the current capacities (Celln_Cap) of difference (Celln_SOC_Diff) and each battery cell unit
Obtain the difference electricity (Celln_Q_ differed between current each battery cell unit and target SOC(Cell_Target_SOC)
Diff)；That is difference electricity (Celln_Q_Diff)=difference (Celln_SOC_Diff) * battery cell unit current capacities
(Celln_Cap)；And calculate current capacities minimum battery cell unit (Cell_Cap_Min) and target SOC(Cell_
Target_SOC lowest difference value electricity (Celln_Q_Diff_Target)), i.e. lowest difference value electricity (Celln_Q_Diff_
Target the minimum battery cell unit (Cell_Cap_ of)=lowest difference value (Cell_SOC_Diff_Target) * current capacities
Min current capacities)；
Step e) is by the difference electricity (Celln_Q_Diff) being calculated and lowest difference value electricity (Celln_Q_Diff_
Target) as input, judge whether each battery cell unit needs to be equalized, Lai Shixian by comparing the size of the two
Each battery cell unit works in the SOC window for being median with target SOC(Cell_Target_SOC)；If difference
It is poor that the value that electricity (Celln_Q_Diff) subtracts lowest difference value electricity (Celln_Q_Diff_Target) is greater than target electricity
When (Celln_Target_ Q_Diff), then the equilibrium of this battery cell unit is opened；Simultaneously also by difference electricity
(Celln_Q_Diff) and the difference of lowest difference value electricity (Celln_Q_Diff_Target) is come the battery of equilibrium required for calculating
The time for balance of monomeric unit needs is simultaneously controlled for balanced output；If difference electricity (Celln_Q_Diff) subtracts lowest difference value
When the value of electricity (Celln_Q_Diff_Target) is greater than target electricity poor (Celln_Target_ Q_Diff), then calculate equal
Weigh time (t)={ difference electricity (Celln_Q_Diff)-lowest difference value electricity (Celln_Q_Diff_Target)-target electricity
Poor (Celln_Target_ Q_Diff) }/euqalizing current (I)；
Step f) returns to step a and is recycled next time.
2. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
It is: target SOC(Cell_Target_SOC in the step b) it is between the 45% to 60% of battery cell cell capability.
3. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
Be: the battery cell unit is battery cell.
4. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
Be: the battery cell unit is battery pack string.
5. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
It is: the SOC(Celln_SOC of each battery cell unit can also be calculated in the step a) and monomer internal resistance (Celln_
DCIR) in order to calculating.
6. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
Be: target electricity poor (Celln_Target_ Q_Diff) is preset value in the step e.
7. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
Be: target electricity poor (Celln_Target_ Q_Diff) is 0 in the step e.
8. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
It is: is once uniformly completed when time for balance (t) is implemented in the step e.
9. a kind of equalization methods based on lithium-ion battery monomer SOC and monomer capacity according to claim 1, feature
Be: substep is gradually completed when time for balance (t) is implemented in the step e.
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