CN105634063A - Battery historical data based active equalization method - Google Patents
Battery historical data based active equalization method Download PDFInfo
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- CN105634063A CN105634063A CN201610064512.3A CN201610064512A CN105634063A CN 105634063 A CN105634063 A CN 105634063A CN 201610064512 A CN201610064512 A CN 201610064512A CN 105634063 A CN105634063 A CN 105634063A
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a charge-discharge technology for batteries, and provides a battery historical data based active equalization method. The active equalization method specifically comprises the steps of step 1, measuring voltage characteristic curves of different types of batteries under specified conditions; step 2, when a charging process is started, checking the electric quantity corresponding to the voltage of each single battery in the battery pack when the last charging process is finished; predicting the electric quantity of each single battery when the current charging process is finished without performing equalization according to the equalization electric quantity for each single battery in the last discharge process; step 3, calculating the average value of the predicted electric quantities of all the single batteries, and ranking the predicted electric quantities from higher to lower in sequence; finding out m single batteries with the maximum predicted electric quantity and n single batteries with the minimum predicted electric quantity; and taking the difference values between the predicted electric quantities of the single batteries and the average value of the predicted electric quantities of all the single batteries as the equalization electric quantity required values of the single batteries; and step 4, performing equalization based on the equalization electric quantity required values. According to the active equalization method, the residual electric quantity levels of the battery packs tend to be uniform through the active equalization, and/or the capacity of the battery pack is higher than that of the series-wound branch with the minimum capacity in the battery pack.
Description
Technical field
The present invention relates to battery charging and discharging technology, specifically a kind of active equalization method based on battery history data, can the dump energy level of battery cell in active equalization battery module, thus being effectively improved the capacity of set of cells.
Background technology
The active equalization method of development can be divided mainly into two big classes at present, the first kind (documents 1, CN201110101124.5) it is terminal voltage and the average voltage of real-time comparative cell monomer, thus the monomer that voltage is higher is carried out equalization discharge, and/or the monomer that voltage is relatively low is charged equilibrium. Equations of The Second Kind (documents 2, CN201510060954.6) is according to open-circuit voltage, it is judged that when open-circuit voltage can reflect dump energy level more truly, carry out equilibrium after charge/discharge starts. Wherein, the situation of monotone variation relation is there is in previous class equalization methods suitable in cell voltage and dump energy, as for the ternary lithium-ion battery system without obvious voltage platform, when the temperature of the internal each battery cell of balance module and current condition concordance are better, there is obvious monotone variation characteristic in the voltage of battery cell and dump energy. Equations of The Second Kind then mainly for the ferric phosphate lithium cell system that there is obvious voltage platform, disclose a kind of specific open-circuit voltage scope judge dump energy whether higher or lower than module average electricity level thus the method carrying out Balance route. When meeting corresponding condition, above-mentioned two class methods all can to battery module inside each monomer capacity level quite and the different monomer of dump energy level carries out equilibrium treatment, improve the capacity performance that set of cells is overall. It is disadvantageous in that, it does not have make full use of the historical data of battery, thus after can not using a period of time for set of cells, monomer capacity level occurs that the situation of difference makes equilibrium treatment. It is to say, adopting the limit that this two classes equalization methods can reach effect is that the capacity of set of cells is equal to the capacity on the road of the minimum series connection of capacity in set of cells.
Summary of the invention
Cause, for equalization methods of the prior art, the technical problem that battery capacity is little, the invention discloses a kind of active equalization method based on battery history data.
Technical scheme is as follows:
The invention provides a kind of active equalization method based on battery history data, specifically include following steps:
Step one, measurement variety classes battery voltage response under prescribed conditions, set up the corresponding relation between charging/discharging voltages or open-circuit voltage and battery charge level under different condition;
When step 2, charging start, the electricity that in inquiry set of cells, each monomer voltage when charging terminates last time is corresponding, and according to balanced electricity to each monomer in last discharge process, it was predicted that do not carry out electricity of each monomer during this charging end when equilibrium; Or electric discharge is when starting, the electricity that in inquiry set of cells, each monomer voltage when electric discharge terminates last time is corresponding, and according to balanced electricity to each monomer in last charging process, it was predicted that do not carry out electricity of each monomer during this electric discharge end when equilibrium;
Step 3, calculate all monomers prediction electricity meansigma methods, and prediction electricity is ranked up from big to small, finding out the monomer that wherein m joint prediction electricity is maximum and n joint prediction electricity is minimum, the prediction electricity of these monomers predicts the balanced electrical demand value as these monomers of the difference between the meansigma methods of electricity with all monomers;
In step 4, charge/discharge process, according to the calculated balanced electrical demand value of step 3, the m that electricity is maximum is saved monomer and carries out equalization discharge, the n that electricity is minimum is saved monomer and is charged equilibrium, and the actual balanced electricity in this charge/discharge process is recorded. By the historical data of battery, set of cells is carried out active equalization so that the dump energy level of set of cells reaches unanimity, and/or battery capacity is higher than the capacity of the minimum series arm of capacity in set of cells. Basis reference using history discharge data as discharge process electric quantity balancing, it is possible to determine rapidly the monomer that in set of cells, inducing capacity fading is bigger. Carry out equilibrium treatment by active equalization method disclosed in this invention, be possible not only to give full play to the theoretical capacity of battery, moreover it is possible to realize the series arm that the whole volume of set of cells is minimum more than capacity.
Further, when said method also includes step 5, charging terminates, the relatively change of the difference of the meansigma methods of this charge and charged the last time electricity corresponding to voltage of the battery cell being discharged equilibrium when terminating and electricity corresponding to all monomers each voltage, thus revising equalization discharge coefficient; Or during electric discharge end, compare this change of the difference of the meansigma methods of electricity corresponding to the electricity corresponding to voltage and all monomers each voltage that are electrically charged balanced battery cell when terminating of discharging and discharged last time, thus revising charge balancing coefficient.
The revised equalization discharge coefficient=balanced electricity of balanced electricity+this charging process of discharge process (the last time)/difference of meansigma methods (electricity and the module corresponding electricity of each monomer voltage that when electricity and module corresponding electricity of each monomer voltage that when this charging of equalized monomer terminates, voltage is corresponding obtains the difference-equalized monomer charging last time end of meansigma methods, voltage is corresponding obtain), revised equalization discharge coefficient is as new equalization discharge coefficient for calculating equalization discharge requirements when carrying out equalization discharge next time, and computing formula is: equalization discharge requirements=(need to carry out the meansigma methods of prediction electricity-all monomers prediction electricity of equalization discharge monomer) * equalization discharge coefficient. The revised charge balancing coefficient=balanced electricity of balanced electricity+this discharge process of charging process (last time)/(when this electric discharge of equalized monomer terminates the difference of the meansigma methods of electricity and module each monomer voltage corresponding electricity that voltage is corresponding during difference of the meansigma methods of electricity and the module corresponding electricity of each monomer voltage that voltage is corresponding-equalized monomer electric discharge last time end), revised charge balancing coefficient is as new charge balancing coefficient for calculating charge balancing requirements when being charged equilibrium next time, and computing formula is: charge balancing requirements=(need to be charged the meansigma methods of prediction electricity-all monomers prediction electricity of balanced monomer) * charge balancing coefficient.
As preferably, the rated condition of described voltage response is the constant current charge-discharge curve under different temperatures and current condition. Temperature range is generally-20 to 50 DEG C, and temperature interval is 5 DEG C, can also suitably adjust temperature range and temperature interval in practical operation according to practical situation; Size of current is specifically determined according to battery capacity and work multiplying power condition, generally choose 0.1C, 0.2C, 0.5C, 1.0C, 2.0C and 5.0C, practical operation can suitably compress and/or increase multiplying power interval range reduction magnification change interval according to set of cells working condition. Voltage response under test rated condition, thus ensureing that voltage when ending according to discharge and recharge inquires about the accuracy of gained charge value.
As preferably, described method also includes, at the voltage inapparent voltage range of variation relation with electricity, using the electricity upper limit of this voltage range as charge value during charging, using the electricity lower limit of this voltage range as charge value during electric discharge. Thus the impact that the inquiry electricity error effectively reducing the electric core architecture that there is voltage platform inconspicuous with dump energy change at voltage platform interval voltage and causing is on balanced electrical demand value calculating.
As preferably, the balanced electricity of the prediction electricity of charging process=inquire about electricity when obtained last time, charging terminated+last time discharge process; The balanced electricity of electricity when electric discharge terminates obtained last time of the prediction electricity=inquire about of discharge process+last time charging process.
As preferably, it was predicted that the balanced electrical demand value of the m joint monomer that electricity is maximum is negative, it was predicted that the balanced electrical demand value of the n joint monomer that electricity is minimum is positive number, and the balanced electrical demand value of other monomers is zero.
As preferably, the value of prediction electricity maximum monomer m, the n minimum with electricity meets: if battery in individual module can be carried out the number of monomers of equalization discharge process more than in module 1/3rd of number of monomers by battery management system simultaneously, then 1/3rd of the size delivery block number of monomers of m, otherwise being sized to battery management system and can carry out the number of monomers of equalization discharge process simultaneously to individual module of m; If battery in individual module can be charged the number of monomers of equilibrium treatment more than in module 1/3rd of number of monomers by battery management system simultaneously, then 1/3rd of the size delivery block number of monomers of n, otherwise being sized to battery management system and can carry out the number of monomers of equalization discharge process simultaneously to individual module of n.
As preferably, being charged the balanced electricity of battery during equilibrium treatment is positive number, and carrying out the balanced electricity of battery when equalization discharge processes is negative, and the balanced electricity not carrying out the battery of equilibrium treatment is zero.
As preferably, described equalization discharge should be taken into account cell degradation coefficient when processing with charge balancing. When battery actual capacity is K times of nominal capacity, then charge/discharge equilibrium electrical demand value=(meansigma methods of the prediction electricity of monomer-all monomers prediction electricity) * K* charge/discharge equalizing coefficient. Wherein K is cell degradation coefficient.
As preferably, described cell degradation coefficient obtains from other modules of battery management system such as SOC computing module, it is also possible to is calculated by balance module and obtains.
As preferably, described equalization discharge and charge balancing coefficient are positive number. Thus avoid battery behavior undergo mutation (cause such as outside or inside factor internal resistance, the sudden change of polarization characteristic) time, calculate gained equalization discharge and be negative with charge balancing coefficient and cause occurring wrong balanced.
As preferably, described charge balancing coefficient, equalization discharge coefficient is stored in battery management system memory element after each equilibrium and uses when next time is balanced.
As preferably, described active equalization method can also be used for the equilibrium treatment between battery modules. Now the calculating of balanced electrical demand value is same as described above, only each module need to be regarded when carrying out equilibrium treatment a battery cell as.
By adopting above technical scheme, the invention have the benefit that the method for the present invention is not by the restriction of battery material system and balanced way, make full use of battery history data, equalization efficiency is high, the situation of inerrancy equilibrium situation and invalid equilibrium, can effectively promote the concordance of monomer in battery modules. Basis reference using history charge data as charging process electric quantity balancing, the basis reference using history discharge data as discharge process electric quantity balancing, it is possible to determine rapidly the monomer that in set of cells, inducing capacity fading is bigger. Carry out equilibrium treatment by active equalization method disclosed in this invention, be possible not only to make the dump energy level of monomer in set of cells to reach unanimity, moreover it is possible to realize the series arm that the whole volume of set of cells is minimum more than capacity.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention active equalization method flow chart in charging process.
Fig. 2 be with ternary material be positive pole, graphite be negative pole lithium-ion battery monomer charge-discharge characteristic curve under room temperature, 0.2C multiplying power. The voltage of each monomer position on charging characteristic curve when previous charging and discharging terminates in A, B, C respectively embodiment 1 in figure.
The voltage of each monomer relevant position on charging characteristic curve when Fig. 3 is embodiment 1 charging end.
The lithium-ion battery monomer charge-discharge characteristic curve under room temperature, 0.2C multiplying power that Fig. 4 is is negative pole with iron phosphate lithium positive pole, graphite. The voltage of each monomer position on charging characteristic curve when previous charging and discharging terminates in A, B, C embodiment 2 respectively in figure.
Fig. 5 position embodiment of the present invention is at the active equalization method flow chart of discharge process.
The voltage of each monomer relevant position on charging characteristic curve when Fig. 6 is embodiment 2 charging end.
Detailed description of the invention
Below in conjunction with Figure of description, describe the specific embodiment of the present invention in detail.
The core concept of the present invention is, in order to improve the active volume of set of cells, it is necessary to reduces voltage in charging and discharging process and takes the lead in reaching the operating current of the monomer of blanking voltage, thus increasing the active volume of set of cells.
In the present invention, charge and discharge process should hocket, should be regarded as the different phase of a charging process when twice or repeatedly discharge off process in charging process, when in twice or multiple discharge process without charging process, should be regarded as the different phase of a discharge process.
Embodiment 1
Fig. 1 show in charging process of the present invention active equalization method flow chart, and when charging starts, charge-discharge characteristic curve according to Fig. 2, inquiry battery module (is saved ternary (LiNi by 31/3Mn1/3Co1/3O2) lithium ion battery is composed in series) and in electricity QA=10Ah, QB=9Ah and QC=8.5Ah corresponding to all monomers voltage when last time, charging terminated.
Discharge process: in the discharge process before this charging, A has been carried out equalization discharge process, the absolute value of balanced electricity is 0.5Ah, C has been carried out charge balancing process, the absolute value of balanced electricity is 0.3Ah, B is not carried out equilibrium treatment, therefore balanced electricity �� QA=-0.5Ah, �� QB=0 and the �� QC=0.3 of each monomer. Equilibrium treatment according to discharge process can predict that when obtaining charging termination when this charging process does not carry out equilibrium treatment, the prediction electricity of each monomer is: QeA=9.5Ah, QeB=9Ah, QeC=8.8Ah;
Relatively find, in this charging process, need A is carried out equalization discharge process, need C is charged equilibrium treatment, the meansigma methods of prediction electricity is 9.1Ah ((9.5+9+8.8)/3), now cell degradation coefficient is 1, represent that battery actual capacity is equal to theoretical capacity, charge balancing coefficient is 0.8, equalization discharge coefficient is 0.9, therefore the balanced electrical demand value of A is the balanced electrical demand value of (9.1-9.5) * 1*0.8Ah ��-0.3Ah, C is (9.1-8.8) * 1*0.9 ��+0.3Ah.
According to balanced electrical demand value, A being carried out equalization discharge process in charging process, C is charged equilibrium treatment, in process, the actual balanced electricity of A and C is equal with balanced electrical demand value.
After charging terminates, as shown in Figure 3, A, electricity corresponding to the voltage of B and C respectively QA=10Ah, QB=9.8Ah and QC=9.9Ah, now the electricity of A monomer is+0.1Ah with the difference of meansigma methods, when last time, charging terminated, the electricity of A monomer was about+0.8Ah with the difference of average electricity value, therefore it is the balanced electricity of balanced electricity+this charging process of discharge process (the last time)/difference of meansigma methods (electricity and the module corresponding electricity of each monomer voltage that when electricity and module corresponding electricity of each monomer voltage that when this charging terminates, equalized monomer voltage is corresponding obtains difference-charging end last time of meansigma methods, equalized monomer voltage is corresponding obtain)=((-0.5)+(-0.3))/((+0.1)-(+0.8))=1.1 by charge balancing coefficient correction further, namely new charge balancing coefficient is 1.1.
The data of above-mentioned charge and discharge process are analyzed by active equalization method disclosed according to the present invention: A has been carried out equalization discharge process in discharge process by last time, balanced electricity is-0.5Ah, according to detection, A when last time, electric discharge terminated, the electricity of B and C respectively 0.3, 0.1 and 0Ah, the electricity ratio module big 0.2Ah of electricity meansigma methods of A when electric discharge terminates, the charge value of A+0.8Ah higher than meansigma methods before electric discharge, the variable quantity of the difference between electricity and the average electricity level of visible electric discharge front and back A monomer is more than equalization discharge electricity (i.e. | 0.2-0.8 |>|-0.5 | to A), show that discharge capacity identical in discharge process causes the decrease speed of A monomer voltage to exceed module average level, on the other hand, when this charging starts, the electricity ratio module big 0.2Ah of electricity meansigma methods of A, the electricity that A carries out in this charging process equalization discharge is-0.3Ah, and the electricity ratio average electricity height+0.1Ah of A during this charging end, the variable quantity of the difference between electricity and the average electricity level of visible charging front and back A monomer is less than the equalization discharge electricity (i.e. | 0.1-0.2 |<|-0.3 |) to A, it was shown that charge volume identical in charging process causes the rate of climb of A monomer voltage to exceed module average level. to sum up, A monomer voltage in charging process rises and voltage decrease speed in discharge process is all big than module average level, thus conclude that A monomer now actual capacity than set of cells average size low 0.1��0.2Ah.
Embodiment 2
Press active equalization method flow chart shown in Fig. 1 equally, when charging starts, charge-discharge characteristic curve according to Fig. 4, inquire about electricity QA=51.6Ah, QB=45.6Ah and QC=39.6Ah corresponding to all monomers voltage when last time, charging terminated in battery module (being saved ferric phosphate lithium ion batteries by 3 to be composed in series).
Before this charging in discharge process, not carrying out equilibrium treatment, therefore �� QA=�� QB=�� QC=0, calculating the prediction state of charge of each monomer during this charging termination when not carried out equilibrium treatment further is: QeA=51.6Ah, QeB=45.6Ah, QeC=39.6Ah.
According to comparing, in this charging process, need A is carried out equalization discharge process, needing C is charged equilibrium treatment, it was predicted that the meansigma methods of electricity is 45.6Ah, now cell degradation coefficient is 1, represent that battery actual capacity is equal to theoretical capacity, charge balancing coefficient is 1, and therefore the balanced electrical demand value of A is the balanced electrical demand value of (45.6-51.6) * 1*1Ah ��-6Ah, C is (45.6-39.6) * 1*1 ��+6Ah;
A is carried out equalization discharge process according to balanced electrical demand value by charging process, C is charged equilibrium treatment, due to the restriction of euqalizing current ability in actual charging process, the actual balanced electricity of A and C is less than balanced electrical demand value, the actual discharge equilibrium electricity of A battery is-2Ah, and the actual charge balancing electricity of B battery is+2Ah.
Equilibrium treatment is carried out according to the balanced flow process of discharge process as shown in Figure 5. A during electric discharge end last time in Fig. 4, relative electricity respectively QA=12Ah corresponding to the voltage of B and C, QB=6Ah and QC=0, last time charging process actual balanced electricity respectively �� QA=-2Ah, �� QB=0, �� QC=+2Ah, when therefore not carrying out equilibrium treatment, at discharge capacity with the prediction state of charge of each monomer when this electric discharge stops when last time, discharge capacity was identical it is: QeA=10Ah, QeB=6Ah and QeC=2Ah, now set of cells can also be discharged to the electricity of minimum monomer further is 0, therefore now set of cells can discharge than last time many releasing 2Ah electricity, and discharge cut-off time each monomer prediction state of charge enter for QeA=8Ah, QeB=4Ah and QeC=0Ah.
In this discharge process, need A is carried out equalization discharge process, C is charged equilibrium treatment, the meansigma methods of prediction electricity is 6Ah, now cell degradation coefficient is 1, represents that battery actual capacity is equal to theoretical capacity, and equalization discharge coefficient is 1, therefore the balanced electrical demand value of A is the balanced electrical demand value of (6-10) * 1*1Ah ��-4Ah, C is (6-2) * 1*1 ��+4Ah.
A is carried out equalization discharge process according to balanced electrical demand value by discharge process, C is charged equilibrium treatment, actual balanced electricity is equal to balanced electrical demand value, and the actual discharge equilibrium electricity of A battery is-4Ah, and the actual charge balancing electricity of B battery is+4Ah.
When electric discharge terminates, it has been found that the discharge voltage of A, B and C is equal, therefore corresponding electricity is also equal.
Fig. 6 show the electricity of each cell voltage and correspondence thereof, QA=51.6Ah, QB=47.6Ah, QC=43.6Ah when the charging process before this discharges terminates. Actual balanced electricity according to this discharge process, �� QA=-4Ah, �� QB=0, �� QC=+4Ah, calculating the prediction state of charge of each monomer during charging termination next time when not carrying out equilibrium treatment is: QeA=QeB=47.6Ah, each monomer electricity is equal, therefore does not need to carry out equilibrium treatment during charging next time.
The data of above-mentioned charge and discharge process are analyzed by active equalization method disclosed according to the present invention, it is possible to make the actual capacity of three batteries in set of cells equal, thus increasing the active volume of set of cells.
Coefficient given in the above embodiments and parameter; it is available to those skilled in the art realize or use invention; invention does not limit and only takes aforementioned disclosed numerical value; when without departing from the thought invented; above-described embodiment can be made various modifications or adjustment by those skilled in the art; thus the protection domain of invention is not limit by above-described embodiment, and the maximum magnitude of the inventive features that claims are mentioned should be consistent with.
Claims (10)
1., based on an active equalization method for battery history data, it specifically includes following steps:
Step one, measurement variety classes battery voltage response under prescribed conditions, set up the corresponding relation between charging/discharging voltages or open-circuit voltage and battery charge level under different condition;
When step 2, charging start, the electricity that in inquiry set of cells, each monomer voltage when charging terminates last time is corresponding, and according to balanced electricity to each monomer in last discharge process, it was predicted that do not carry out electricity of each monomer during this charging end when equilibrium; Or electric discharge is when starting, the electricity that in inquiry set of cells, each monomer voltage when electric discharge terminates last time is corresponding, and according to balanced electricity to each monomer in last charging process, it was predicted that do not carry out electricity of each monomer during this electric discharge end when equilibrium;
Step 3, calculate all monomers prediction electricity meansigma methods, and prediction electricity is ranked up from big to small, finding out the monomer that wherein m joint prediction electricity is maximum and n joint prediction electricity is minimum, the prediction electricity of these monomers predicts the balanced electrical demand value as these monomers of the difference between the meansigma methods of electricity with all monomers;
In step 4, charge/discharge process, according to the calculated balanced electrical demand value of step 3, the m that electricity is maximum is saved monomer and carries out equalization discharge, the n that electricity is minimum is saved monomer and is charged equilibrium, and the actual balanced electricity in this charge/discharge process is recorded.
2. the active equalization method based on battery history data as claimed in claim 1, it is characterized in that when described method also includes step 5, charging end, the relatively change of the difference of the meansigma methods of this charge and charged the last time electricity corresponding to voltage of the battery cell being discharged equilibrium when terminating and electricity corresponding to all monomers each voltage, thus revising equalization discharge coefficient, or during electric discharge end, compare this change of the difference of the meansigma methods of electricity corresponding to the electricity corresponding to voltage and all monomers each voltage that are electrically charged balanced battery cell when terminating of discharging and discharged last time, thus revising charge balancing coefficient, the wherein revised equalization discharge coefficient=balanced electricity of balanced electricity+this charging process of discharge process (last time)/(when this charging of equalized monomer terminates the difference of the meansigma methods of electricity and module each monomer voltage corresponding electricity that voltage is corresponding during difference of the meansigma methods of electricity and the module corresponding electricity of each monomer voltage that voltage is corresponding-equalized monomer charging last time end), revised equalization discharge coefficient is used for the equalization discharge requirements calculated when carrying out equalization discharge next time as new equalization discharge coefficient, computing formula is: equalization discharge requirements=(need to carry out the meansigma methods of prediction electricity-all monomers prediction electricity of equalization discharge monomer) * equalization discharge coefficient, the revised charge balancing coefficient=balanced electricity of balanced electricity+this discharge process of charging process (last time)/(when this electric discharge of equalized monomer terminates the difference of the meansigma methods of electricity and module each monomer voltage corresponding electricity that voltage is corresponding during difference of the meansigma methods of electricity and the module corresponding electricity of each monomer voltage that voltage is corresponding-equalized monomer electric discharge last time end), revised charge balancing coefficient is as new charge balancing coefficient for calculating charge balancing requirements when being charged equilibrium next time, and computing formula is: charge balancing requirements=(need to be charged the meansigma methods of prediction electricity-all monomers prediction electricity of balanced monomer) * charge balancing coefficient.
3. the active equalization method based on battery history data as claimed in claim 2, it is characterised in that the rated condition of described voltage response is the constant current charge-discharge curve under different temperatures and current condition.
4. the active equalization method based on battery history data as claimed in claim 3, it is characterized in that described method also includes, at the voltage inapparent voltage range of variation relation with electricity, using the electricity upper limit of this voltage range as charge value during charging, using the electricity lower limit of this voltage range as charge value during electric discharge.
5. the active equalization method based on battery history data as claimed in claim 4, it is characterised in that the balanced electricity of the prediction electricity of charging process=inquire about electricity when obtained last time, charging terminated+last time discharge process; The balanced electricity of electricity when electric discharge terminates obtained last time of the prediction electricity=inquire about of discharge process+last time charging process.
6. the active equalization method based on battery history data as claimed in claim 5, it is characterized in that the prediction maximum m of electricity saves the balanced electrical demand value of monomer is negative, the balanced electrical demand value of the n joint monomer that prediction electricity is minimum is positive number, and the balanced electrical demand value of other monomers is zero.
7. the active equalization method based on battery history data as claimed in claim 6, battery in individual module it is characterized in that the value of prediction electricity maximum monomer m, the n minimum with electricity meets: if can be carried out the number of monomers of equalization discharge process more than in module 1/3rd of number of monomers by battery management system simultaneously, then 1/3rd of the size delivery block number of monomers of m, otherwise being sized to battery management system and can carry out the number of monomers of equalization discharge process simultaneously to individual module of m; If battery in individual module can be charged the number of monomers of equilibrium treatment more than in module 1/3rd of number of monomers by battery management system simultaneously, then 1/3rd of the size delivery block number of monomers of n, otherwise being sized to battery management system and can carry out the number of monomers of equalization discharge process simultaneously to individual module of n.
8. the active equalization method based on battery history data as claimed in claim 7, it is characterized in that when charge balancing processes, the balanced electricity of battery is positive number, carrying out the balanced electricity of battery when equalization discharge processes is negative, and the balanced electricity not carrying out the battery of equilibrium treatment is zero.
9. such as the active equalization method based on battery history data that claim 8 is stated, it is characterized in that working as battery actual capacity is K times of nominal capacity, then charge/discharge equilibrium electrical demand value=(meansigma methods of the prediction electricity of monomer-all monomers prediction electricity) * K* charge/discharge equalizing coefficient, K is cell degradation coefficient.
10. such as the active equalization method based on battery history data that claim 8 is stated, it is characterised in that described equilibrium and charge balancing coefficient are positive number.
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| CN110015175A (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 |
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| CN111584955A (en) * | 2020-05-13 | 2020-08-25 | 瑞浦能源有限公司 | Regulating and controlling method of storage battery, electronic equipment and storage medium |
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| CN112659957A (en) * | 2020-12-31 | 2021-04-16 | 爱驰汽车有限公司 | Remote monitoring method of charging equipment |
| CN114720880A (en) * | 2022-03-29 | 2022-07-08 | 中国第一汽车股份有限公司 | Battery cell consistency difference estimation method, system, terminal and storage medium |
| CN114825561A (en) * | 2022-06-23 | 2022-07-29 | 中国人民解放军海军工程大学 | Active equalization control method for super capacitor group string |
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| CN114825561A (en) * | 2022-06-23 | 2022-07-29 | 中国人民解放军海军工程大学 | Active equalization control method for super capacitor group string |
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