CN103972965A - Dynamic adjustment type battery pack active equalizing method - Google Patents
Dynamic adjustment type battery pack active equalizing method Download PDFInfo
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- CN103972965A CN103972965A CN201410203044.4A CN201410203044A CN103972965A CN 103972965 A CN103972965 A CN 103972965A CN 201410203044 A CN201410203044 A CN 201410203044A CN 103972965 A CN103972965 A CN 103972965A
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Abstract
The invention discloses a dynamic adjustment type battery pack active equalizing method. The dynamic adjustment type battery pack active equalizing method comprises the steps that a battery pack is discharged, and a battery cell discharging d%-Vdkx curve is established; the battery pack is charged, and a battery cell charging c%-Vckx curve is established; when the capacity of a certain battery cell reaches a set capacity, equalizing is started; m battery cells with the lowest floating voltage are charged until the floating voltage reaches an average value; whether the range of the floating voltage of the battery cells is smaller than a set value is judged, and if yes, discharging is completed; charging of the battery pack is started; the voltages of battery cells with the internal resistance partial voltages removed are calculated, and the floating voltages are calculated; when the capacity of a certain battery cell reaches a set capacity through charging, equalizing is started; m battery cells with the lowest floating voltage are charged until the floating voltage reaches an average value; whether the range of the floating voltage of the battery cells is smaller than the set value is judged, and if yes, charging is completed. According to the dynamic adjustment type battery pack active equalizing method, the characteristics of each battery cell can be analyzed dynamically, and the energy of the battery cells with high capacities is accurately and efficiently supplied to the battery cells with low capacities.
Description
Technical field
The present invention relates to battery pack balancing technology, especially a kind of dynamically adjusting type battery pack active equalization method.
Background technology
Majority adopts the balance policy of passive dissipative type to improve the consistency of lithium battery on the market at present.But this technology caloric value is large, euqalizing current is little and the waste energy content of battery, can not play the effect of learning from other's strong points to offset one's weaknesses, and makes the monomer battery core of high electric weight in battery pack can not give full play to capacity, and the capacity of whole battery pack depends on the monomer battery core of minimum capacity.Part active equalization technology is also immature, can not very accurately energy more than needed be made full use of very in time.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of dynamically adjusting type battery pack active equalization method, can dynamically analyze the characteristic of each monomer, when battery power discharge, precisely efficiently the energy supplement of the monomer battery core of high power capacity is given to the monomer battery core of low appearance; When batteries charging, the energy of the battery core precisely efficiently low appearance being first full of is moved the battery core being full of to Gao Ronghou, make the battery pack core that respectively economizes on electricity accomplish to exhaust simultaneously and be full of simultaneously, thereby realize the effect of learning from other's strong points to offset one's weaknesses that high efficiency is moved and loss is minimum, promote battery pack whole volume.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of dynamically adjusting type battery pack active equalization method, and its circuit based on realizing comprises transformer, described transformer comprises a main coil and n secondary coil, n >=3; Each secondary coil is corresponding to be connected with a cell, and described cell is composed in series battery pack, and the electric energy that utilizes battery pack supplements electric method to m cell wherein and comprises the following steps, m≤n/3, and wherein m is integer;
(1) battery pack starts initial alignment:
(2) be full of the floating voltage of cell detection record cell;
(3) battery pack constant-current discharge, detects electric current and calculates discharge capacity;
(4) record monomer battery discharge moment band live pressure;
(5) calculate and record internal resistance of single cell DCR;
(6) record at set intervals monomer battery voltage and capacity until discharge off;
(7) build cell electric discharge d%-Vdkx curve;
(8) battery pack starts charging;
(9) record at set intervals the voltage of cell and capacity until charge complete;
(10) build cell charging c%-Vckx curve;
(11) battery pack primary data is demarcated complete;
(12) normally use and record cell floating voltage;
(13) battery power discharge, measures and calculates internal resistance of single cell DCR and discharge capacity;
(14) measure monomer battery voltage, and remove internal resistance dividing potential drop and calculate floating voltage;
(15) when battery power discharge be greater than to setting capacity, floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced;
(16) m minimum cell of floating voltage charged, until floating voltage reaches mean value;
(17) judging whether cell floating voltage extreme difference is less than set point, otherwise continue equilibrium, is to stop equilibrium, until discharge off;
(18) battery pack starts to charge and measures the charging capacitor amount of calculating;
(19) measure monomer battery voltage, and remove internal resistance dividing potential drop and calculate floating voltage;
(20) when batteries charging be greater than to setting capacity, floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced;
(21) m minimum cell of floating voltage charged, until floating voltage reaches mean value;
(22) judging whether cell floating voltage extreme difference is less than set point, otherwise continue equilibrium, is to stop equilibrium, until it is complete to charge;
As improvement, when discharge moment and electric current are more than or equal to 0.1C, according to difference Δ V/ electric current I=internal resistance of single cell DCR of transient voltage after voltage and electric discharge before cell electric discharge at every turn.
As improvement, according to the first discharge characteristic voltage of constant-current discharge mode detection Vdx and " real-time current I-time Δ t " data, integration ∫ Idt calculates and has put capacity C d again, until electric discharge finishes, record first minimum cell discharge capacity Cd0min, percent of discharge d%=Cd/Cd0min, after the voltage Vdx compensation internal resistance dividing potential drop I*DCR of the detection in corresponding stored moment, obtain cell electric discharge floating voltage Vdkx, and in memory, build " the unloaded character voltage Vdkx of percent of discharge d%-" diagram database with percent of discharge d%, now discharge data library initialization is complete.
As improvement, when electric discharge is used, put volume percent d% according to detection data integrate calculating reality discharge capacity Cd and inquiry discharge data storehouse floating voltage Vdkx correspondence, calculate each cell real surplus capacity SOC=Cd/d%-Cd, thereby learn that a few joint cell SOC are minimum, in the time reaching balanced unlocking condition, it is supplemented to electrical equalization.
As improvement, detect primary charging character voltage Vcx and " real-time current I-time Δ t " data according to constant current charging mode, integration ∫ Idt calculates and has filled capacity C c again, until charging finishes, record first minimum monomer charging capacity Cc0min, charge percentage c%=Cc/Cc0min, after the voltage Vcx compensation internal resistance dividing potential drop I*DCR of the detection in corresponding stored moment, obtain monomer charging floating voltage Vckx, and in memory, build " the unloaded character voltage Vckx of charge percentage c%-" diagram database with charge percentage c%, the data base initialize that now charges is complete.
As improvement, when charging is used, fill volume percent c% according to detection data integrate calculating reality charging capacity Cc and inquiry charging database floating voltage Vckx correspondence, calculate each joint cell capacity SOB=Cc/c%-Cc actual to be filled, thereby learn that a few joint cell SOB are minimum, in the time reaching balanced unlocking condition, it is supplemented to electrical equalization.
As improvement, the Lz circle number of turns of serving as theme, secondary coil number of turns Lx=1.3Lz/n, monomer charge coil floating voltage Vxmax=1.3VDD/n, makes every joint cell can reach enough charging voltage and charging currents, guarantees that balanced efficiency and voltage are controlled.
As improvement, the RC filter circuit that main coil current Iz consists of inspection leakage resistance R2, ratio amplifying circuit and resistance R 1, capacitor C 1 records jointly, secondary current is Ix, voltage is Vx, balanced monomer number is m simultaneously, according to conservation of energy principle, ignore the dissipation loss in loop, balanced energy
when equalizing charge, Vx equals monomer battery core both end voltage Vcell, thereby can obtain each monomer average voltage Vavg and average electric current I avg.
As improvement, according to each cell SOC and SOB and the dynamically PWM duty ratio of adjustment CtrZ of extreme difference size thereof, thereby monomer equalizing charge electric current I z and Iavg are adjusted, if extreme difference more greatly, can improve euqalizing current according to preset proportion, because balanced each cell SOC or SOB move closer to, reduce gradually the mode of euqalizing current by adjusting duty ratio, reach efficiently and control accurately the conforming effect of monomer.
As improvement, the balanced strategy that starts, when the highest when charging (minimum when electric discharge) monomer floating voltage Vdkx reaches setting voltage, be greater than floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced, charging, electric discharge, inactive state all can be opened, and the m joint cell of minimum SOC or SOB can be opened simultaneously.
The beneficial effect that the present invention compared with prior art brought is:
Can dynamically analyze the characteristic of each monomer, when battery power discharge, precisely efficiently the energy supplement of the monomer battery core of high power capacity be given to the monomer battery core of low appearance; When batteries charging, the energy of the battery core precisely efficiently low appearance being first full of is moved the battery core being full of to Gao Ronghou, make the battery pack core that respectively economizes on electricity accomplish to exhaust simultaneously and be full of simultaneously, thereby realize the effect of learning from other's strong points to offset one's weaknesses that high efficiency is moved and loss is minimum, promote battery pack whole volume.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is flow chart of the present invention.
Fig. 3 is the unloaded character voltage model of charge and discharge percentage schematic diagram.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.
As shown in Figure 1, a kind of dynamically adjusting type battery pack active equalization method, its circuit based on realizing comprises transformer, described transformer comprises a main coil and n secondary coil, n >=3; Each secondary coil is corresponding to be connected with a cell, and described cell is composed in series battery pack, and as shown in Figure 2, the electric energy that utilizes battery pack supplements electric method to m cell wherein and comprises the following steps, m≤n/3, and wherein m is integer;
(1) battery pack starts initial alignment:
(2) be full of the floating voltage of cell detection record cell;
(3) battery pack constant-current discharge, detects electric current and calculates discharge capacity;
(4) record monomer battery discharge moment band live pressure;
(5) calculate and record internal resistance of single cell DCR;
(6) record at set intervals monomer battery voltage and capacity until discharge off;
(7) build cell electric discharge d%-Vdkx curve;
(8) battery pack starts charging;
(9) record at set intervals the voltage of cell and capacity until charge complete;
(10) build cell charging c%-Vckx curve;
(11) battery pack primary data is demarcated complete;
(12) normally use and record cell floating voltage;
(13) battery power discharge, measures and calculates internal resistance of single cell DCR and discharge capacity;
(14) measure monomer battery voltage, and remove internal resistance dividing potential drop and calculate floating voltage;
(15) when battery power discharge be greater than to setting capacity, floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced;
(16) m minimum cell of floating voltage charged, until floating voltage reaches mean value;
(17) judging whether cell floating voltage extreme difference is less than set point, otherwise continue equilibrium, is to stop equilibrium, until discharge off;
(18) battery pack starts to charge and measures the charging capacitor amount of calculating;
(19) measure monomer battery voltage, and remove internal resistance dividing potential drop and calculate floating voltage;
(20) when batteries charging be greater than to setting capacity, floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced;
(21) m minimum cell of floating voltage charged, until floating voltage reaches mean value;
(22) judging whether cell floating voltage extreme difference is less than set point, otherwise continue equilibrium, is to stop equilibrium, until it is complete to charge;
When each electric discharge moment and electric current are more than or equal to 0.1C, according to difference Δ V/ electric current I=internal resistance of single cell DCR of transient voltage after voltage and electric discharge before cell electric discharge.
According to the first discharge characteristic voltage of constant-current discharge mode detection Vdx (detected and stored once every 15 seconds) and " real-time current I-time Δ t " data, integration ∫ Idt calculates and has put capacity C d again, until electric discharge finishes, record first minimum cell discharge capacity Cd0min, percent of discharge d%=Cd/Cd0min, after the voltage Vdx compensation internal resistance dividing potential drop I*DCR of the detection in corresponding stored moment, obtain cell electric discharge floating voltage Vdkx, and in memory, build " the unloaded character voltage Vdkx of percent of discharge d%-" diagram database with percent of discharge d%, now discharge data library initialization is complete.
When electric discharge is used, put volume percent d% according to detection data integrate calculating reality discharge capacity Cd and inquiry discharge data storehouse floating voltage Vdkx correspondence, calculate each cell real surplus capacity SOCx=Cd/d%-Cd, thereby learn that a few joint cell SOC are minimum, in the time reaching balanced unlocking condition, it is supplemented to electrical equalization.
Detect primary charging character voltage Vcx (detected and stored once every 15 seconds) and " real-time current I-time Δ t " data according to constant current charging mode, integration ∫ Idt calculates and has filled capacity C c again, until charging finishes, record first minimum monomer charging capacity Cc0min, charge percentage c%=Cc/Cc0min, after the voltage Vcx compensation internal resistance dividing potential drop I*DCR of the detection in corresponding stored moment, obtain monomer charging floating voltage Vckx, and in memory, build " the unloaded character voltage Vckx of charge percentage c%-" diagram database with charge percentage c%, the data base initialize that now charges is complete.
As shown in Figure 3, when charging is used, fill volume percent c% according to detection data integrate calculating reality charging capacity Cc and inquiry charging database floating voltage Vckx correspondence, calculate each joint cell capacity SOBx=Cc/c%-Cc actual to be filled, thereby learn that a few joint cell SOB are minimum, in the time reaching balanced unlocking condition, it is supplemented to electrical equalization.Because battery material itself has determined battery charging and discharging curve model, even if battery actual capacity can reduce along with using gradually, it is very small that but curve model changes, can ignore, so the present invention utilizes lithium battery to discharge or this characteristic of charge percentage curve model reasonably extrapolate battery actual capacity Cr=AVG (Cc/c%, Cd/d%), be the mean value of charge/discharge capacity, when this Cr occurs being less than continuously 70% 3 time with the ratio of initial nominal capacity C, system will point out user need change battery pack.
The Lz circle number of turns of serving as theme, secondary coil number of turns Lx=1.3Lz/n, monomer charge coil floating voltage Vxmax=1.3VDD/n, makes every joint cell can reach enough charging voltage and charging currents, guarantees that balanced efficiency and voltage are controlled.
The RC filter circuit that main coil current Iz consists of inspection leakage resistance R2, ratio amplifying circuit and resistance R 1, capacitor C 1 records jointly, and secondary current is Ix, and voltage is Vx, balanced monomer number is m simultaneously, according to conservation of energy principle, ignore the dissipation loss in loop, balanced energy
when equalizing charge, Vx equals monomer battery core both end voltage Vcell, thereby can obtain each monomer average voltage Vavg and average electric current I avg.
According to each cell SOC and SOB and the dynamically PWM duty ratio of adjustment CtrZ of extreme difference size thereof, thereby monomer equalizing charge electric current I z and Iavg are adjusted, if extreme difference more greatly, can improve euqalizing current according to preset proportion, because balanced each cell SOC or SOB move closer to, reduce gradually the mode of euqalizing current by adjusting duty ratio, reach efficiently and control accurately the conforming effect of monomer.
The balanced strategy that starts, when the highest when charging (minimum when electric discharge) monomer floating voltage Vdkx reaches setting voltage, be greater than floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced, charging, electric discharge, inactive state all can be opened, and the m joint cell of minimum SOC or SOB can be opened simultaneously.
Equilibrium stops strategy, loses efficacy, closes when floating voltage Vdkx reaches mean value and extreme difference is less than 10mV, shutdown, dormancy equilibrium when every batteries does not all reach balanced cut-in voltage, temperature protection, battery failures.
Above-mentioned SOC represents the residual capacity of battery; SOB represents the capacity to be filled of battery, also has how many spaces to fill.
In above-mentioned steps (14) and (19), the voltage of cell utilizes high precision measuring device to measure, it comprises the first voltage measurement module and second voltage measurement module, and described the first voltage measurement module and second voltage measurement module are equipped with some voltage acquisition lines.Described battery pack is in series by some cells, supposes that battery pack is in series by eight joint cell B1～B8.First voltage acquisition line of described the first voltage measurement module is connected to the positive pole of battery pack; Second voltage acquisition line is connected to the positive pole of second section cell B2, and the 3rd voltage acquisition line is connected to the negative pole of second section cell B2; The 4th voltage acquisition line is connected to the positive pole of Section of four cell B4, and the 5th voltage acquisition line is connected to the negative pole of Section of four cell B4; Six roots of sensation voltage acquisition line is connected to the positive pole of Section of six cell B6, and the 7th voltage acquisition line is connected to the negative pole of Section of six cell B6; The 8th voltage acquisition line is connected to the positive pole of Section of eight cell B8, and the 9th voltage acquisition line is connected to the negative pole of Section of eight cell B8.First voltage acquisition line of the first voltage acquisition module is connected in the positive pole of first segment cell B1, and second voltage acquisition line is connected to the negative pole of first segment cell B1; The 3rd voltage acquisition line is connected in the positive pole of Section of three cell B3, and the 4th voltage acquisition line is connected to the negative pole of Section of three cell B3; The 5th voltage acquisition line is connected in the positive pole of Section of five cell B5, and six roots of sensation voltage acquisition line is connected to the negative pole of Section of five cell B5; The 7th voltage acquisition line is connected in the positive pole of Section of seven cell B7, and the 8th voltage acquisition line is connected to the negative pole of Section of seven cell B7; Last root voltage acquisition line is connected to the negative pole of battery pack.It is that first segment cell B1 voltage VB1 adds the line resistance of serial connection and the dividing potential drop VR1 of contact resistance that first, second root voltage acquisition line of the first voltage measurement module is measured the voltage coming; It is exactly first segment cell B1 voltage VB1 that first, second root voltage acquisition line of second voltage measurement module is measured the voltage coming; It is exactly second section cell B2 voltage VB2 that second, third root voltage acquisition line of the first voltage measurement module is measured the voltage coming; It is that second section cell B2 voltage VB2 adds the line resistance of serial connection and the dividing potential drop VR2 of contact resistance that second, third root voltage acquisition line of second voltage measurement module is measured the voltage coming; The monomer battery voltage of even-numbered can be obtained by the first voltage measurement module, and the monomer battery voltage of odd-numbered can be obtained by second voltage measurement module; The rest may be inferred, can draw voltage and all ohmically dividing potential drops of R1～R7 of all cells of B1～B8.
Claims (10)
1. a dynamic adjusting type battery pack active equalization method, is characterized in that: its circuit based on realizing comprises transformer, and described transformer comprises a main coil and n secondary coil, n >=3; Each secondary coil is corresponding to be connected with a cell, and described cell is composed in series battery pack, and the electric energy that utilizes battery pack supplements electric method to m cell wherein and comprises the following steps, m≤n/3, and wherein m is integer;
(1) battery pack starts initial alignment:
(2) be full of the floating voltage of cell detection record cell;
(3) battery pack constant-current discharge, detects electric current and calculates discharge capacity;
(4) record monomer battery discharge moment band live pressure;
(5) calculate and record internal resistance of single cell DCR;
(6) record at set intervals monomer battery voltage and capacity until discharge off;
(7) build cell electric discharge d%-Vdkx curve;
(8) battery pack starts charging;
(9) record at set intervals the voltage of cell and capacity until charge complete;
(10) build cell charging c%-Vckx curve;
(11) battery pack primary data is demarcated complete;
(12) normally use and record cell floating voltage;
(13) battery power discharge, measures and calculates internal resistance of single cell DCR and discharge capacity;
(14) measure monomer battery voltage, and remove internal resistance dividing potential drop and calculate floating voltage;
(15) when battery power discharge be greater than to setting capacity, floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced;
(16) m minimum cell of floating voltage charged, until floating voltage reaches mean value;
(17) judging whether cell floating voltage extreme difference is less than set point, otherwise continue equilibrium, is to stop equilibrium, until discharge off;
(18) battery pack starts to charge and measures the charging capacitor amount of calculating;
(19) measure monomer battery voltage, and remove internal resistance dividing potential drop and calculate floating voltage;
(20) when batteries charging be greater than to setting capacity, floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced;
(21) m minimum cell of floating voltage charged, until floating voltage reaches mean value;
(22) judging whether cell floating voltage extreme difference is less than set point, otherwise continue equilibrium, is to stop equilibrium, until it is complete to charge.
2. the dynamic adjusting type battery pack of one according to claim 1 active equalization method, it is characterized in that: when discharge moment and electric current are more than or equal to 0.1C at every turn, according to difference Δ V/ electric current I=internal resistance of single cell DCR of transient voltage after voltage and electric discharge before cell electric discharge.
3. the dynamic adjusting type battery pack of one according to claim 2 active equalization method, it is characterized in that: according to the first discharge characteristic voltage of constant-current discharge mode detection Vdx and " real-time current I-time Δ t " data, integration ∫ Idt calculates and has put capacity C d again, until electric discharge finishes, record first minimum cell discharge capacity Cd0min, percent of discharge d%=Cd/Cd0min, after the voltage Vdx compensation internal resistance dividing potential drop I*DCR of the detection in corresponding stored moment, obtain cell electric discharge floating voltage Vdkx, and in memory, build " the unloaded character voltage Vdkx of percent of discharge d%-" diagram database with percent of discharge d%, now discharge data library initialization is complete.
4. the dynamic adjusting type battery pack of one according to claim 3 active equalization method, it is characterized in that: when electric discharge is used, put volume percent d% according to detection data integrate calculating reality discharge capacity Cd and inquiry discharge data storehouse floating voltage Vdkx correspondence, calculate each cell real surplus capacity SOC=Cd/d%-Cd, thereby learn that a few joint cell SOC are minimum, in the time reaching balanced unlocking condition, it is supplemented to electrical equalization.
5. the dynamic adjusting type battery pack of one according to claim 4 active equalization method, it is characterized in that: detect primary charging character voltage Vcx and " real-time current I-time Δ t " data according to constant current charging mode, integration ∫ Idt calculates and has filled capacity C c again, until charging finishes, record first minimum monomer charging capacity Cc0min, charge percentage c%=Cc/Cc0min, after the voltage Vcx compensation internal resistance dividing potential drop I*DCR of the detection in corresponding stored moment, obtain monomer charging floating voltage Vckx, and in memory, build " the unloaded character voltage Vckx of charge percentage c%-" diagram database with charge percentage c%, the data base initialize that now charges is complete.
6. the dynamic adjusting type battery pack of one according to claim 5 active equalization method, it is characterized in that: when charging is used, fill volume percent c% according to detection data integrate calculating reality charging capacity Cc and inquiry charging database floating voltage Vckx correspondence, calculate each joint cell capacity SOB=Cc/c%-Cc actual to be filled, thereby learn that a few joint cell SOB are minimum, in the time reaching balanced unlocking condition, it is supplemented to electrical equalization.
7. the dynamic adjusting type battery pack of one according to claim 6 active equalization method, it is characterized in that: the Lz circle number of turns of serving as theme, secondary coil number of turns Lx=1.3Lz/n, monomer charge coil floating voltage Vxmax=1.3VDD/n, make every joint cell can reach enough charging voltage and charging currents, guarantee that balanced efficiency and voltage are controlled.
8. the dynamic adjusting type battery pack of one according to claim 7 active equalization method, it is characterized in that: the RC filter circuit that main coil current Iz consists of inspection leakage resistance R2, ratio amplifying circuit and resistance R 1, capacitor C 1 records jointly, secondary current is Ix, voltage is Vx, balanced monomer number is m simultaneously, according to conservation of energy principle, ignore the dissipation loss in loop, balanced energy
when equalizing charge, Vx equals monomer battery core both end voltage Vcell, thereby can obtain each monomer average voltage Vavg and average electric current I avg.
9. the dynamic adjusting type battery pack of one according to claim 8 active equalization method, it is characterized in that: according to each cell SOC and SOB and the dynamically PWM duty ratio of adjustment CtrZ of extreme difference size thereof, thereby monomer equalizing charge electric current I z and Iavg are adjusted, if extreme difference more greatly, can improve euqalizing current according to preset proportion, because balanced each cell SOC or SOB move closer to, reduce gradually the mode of euqalizing current by adjusting duty ratio, reach efficiently and control accurately the conforming effect of monomer.
10. the dynamic adjusting type battery pack of one according to claim 9 active equalization method, it is characterized in that: the balanced strategy that starts, when when charging, high monomer floating voltage Vdkx reaches setting voltage, be greater than floating voltage Vdkx extreme difference 20mV and system do not break down open in the situation of failure state balanced, charging, electric discharge, inactive state all can be opened, and the m joint cell of minimum SOC or SOB can be opened simultaneously.
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| CN107785967A (en) * | 2017-11-21 | 2018-03-09 | 中航锂电（洛阳）有限公司 | Accumulation power supply system capacity balance control method, control device and equalizing system |
| CN109687548A (en) * | 2018-12-28 | 2019-04-26 | 中国船舶重工集团公司第七一九研究所 | A kind of battery group supplement electric-type active equalization device |
| CN109687548B (en) * | 2018-12-28 | 2022-11-04 | 中国船舶重工集团公司第七一九研究所 | Supplementary electric formula of storage battery initiative balancing unit |
| CN109649217A (en) * | 2019-01-16 | 2019-04-19 | 中国船舶重工集团公司第七〇九研究所 | A kind of control method of electric car supplement electric-type lithium battery group balancer |
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