CN103532189B - Based on battery pack balancing control system and the control method of dynamic equalization point - Google Patents

Based on battery pack balancing control system and the control method of dynamic equalization point Download PDF

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CN103532189B
CN103532189B CN201310476602.XA CN201310476602A CN103532189B CN 103532189 B CN103532189 B CN 103532189B CN 201310476602 A CN201310476602 A CN 201310476602A CN 103532189 B CN103532189 B CN 103532189B
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battery pack
cell
voltage
frequency
power switch
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CN103532189A (en
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朱国荣
邱实
林鹏
何少佳
张东华
陈伟
马燕
刘芙蓉
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Wuhan University of Technology WUT
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Abstract

The invention discloses a kind of battery pack balancing control system based on dynamic equalization point and control method, wherein system comprises: battery pack, voltage sampling circuit, balanced main circuit and balancing control circuit, balancing control circuit is for comparing the magnitude of voltage of each cell, when the voltage difference of different monomers battery exceedes pre-set threshold value, regulate the frequency of the power switch pipe corresponding with cell respectively, the frequency tracking battery pack of control power switch pipe is in the balance frequency under dynamic equalization state.Wherein, dynamic equalization state be every batteries of battery pack discharge in each switch periods with absorb energy equal time state, balance frequency is the frequency of power switch pipe under dynamic equalization state.The present invention can make all battery cells in battery pack almost reach balanced simultaneously, improves balancing speed and efficiency, and the super-charge super-discharge harm preventing the inconsistency of cell to bring, extends the useful life of battery pack.

Description

Based on battery pack balancing control system and the control method of dynamic equalization point
Technical field
The present invention relates to battery voltage balanced technical field, particularly relate to a kind of battery pack balancing control system based on dynamic equalization point and control method.
Background technology
Due to being on the rise of energy crisis and problem of environmental pollution, the development space of new energy technology is more and more extensive, and the whole world is also more urgent to the demand of new energy technology.As lithium battery have that energy density is high, power density is high, long service life and the advantage such as cost performance is high, possess extremely strong development potentiality in new forms of energy application.The rated voltage of lithium battery monomer is about 3.65V, in order to meet the voltage requirements of pure electric automobile, is usually together in series to provide enough power by a large amount of cells.But, while serial battery, also caused the problem of inconsistency of some problems, particularly cell.These problems directly cause battery in charge and discharge cycles process, occur overcharge phenomenon or overdischarge phenomenon, thus significantly reduce the performance of whole battery pack and shorten its useful life, even cause the spontaneous combustion of battery.Because the imbalance problem in serial lithium battery group between cell has directly delayed its process at Large Copacity application high speed development, so take a kind of technological means of necessity to realize Balance route to be effectively the key that lithium battery further develops.
At present, common cell balancing can be divided into dissipative equalization (passive equilibrium) and nondissipative equalization (active equalization) both direction.
Wherein dissipative equalization, by the energy of the high battery cell of consumes power to reach overall balanced object, achieves the equilibrium of lithium battery group, wastes energy, do not meet the requirement of energy-conserving and environment-protective although reliable and effective.
But the circuit structure relative complex of nondissipative equalization, cause the equilibrium of battery pack to be difficult to take into account rapidity, stability and high efficiency, so need the control system of a set of practicality and high efficiency to improve its performance.Major part Balance route strategy is all the PFM control model based on cell voltage difference, but owing to not providing a frequency values determined, so be difficult to the magnetic element in design circuit.
Summary of the invention
The technical problem to be solved in the present invention is the defect for effectively cannot carry out Balance route in prior art to battery pack, provides a kind of the battery pack balancing control system and the control method that improve battery pack balancing speed and efficiency.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of battery pack balancing control system based on dynamic equalization point is provided, comprises:
Battery pack, comprises the cell of multiple series connection;
Voltage sampling circuit, is connected with battery pack, gathers the magnitude of voltage of each cell;
Balanced main circuit, is connected with battery pack, for the energy trasfer between cell, comprises the power switch pipe corresponding with cell and inductance;
Balancing control circuit, connect with voltage collection circuit and balanced main circuit, for comparing the magnitude of voltage of each cell, when the voltage difference of different monomers battery exceedes pre-set threshold value, regulate the frequency of the power switch pipe corresponding with cell respectively, the frequency tracking battery pack of control power switch pipe is in the balance frequency under dynamic equalization state; When the magnitude of voltage of each cell in battery pack reaches unanimity, stop Balance route;
Wherein, dynamic equalization state be every batteries of battery pack discharge in each switch periods with absorb energy equal time state, balance frequency is the frequency of power switch pipe under dynamic equalization state.
In system of the present invention, described balancing control circuit comprises microprocessor and drive circuit, and microprocessor is connected with voltage collection circuit, and drive circuit connects with the power switch pipe of balanced main circuit.
In system of the present invention, this balancing control circuit also comprises FPGA module, be connected between microprocessor and drive circuit, microprocessor sends PFM control signal by this FPGA module to drive circuit, and the duty ratio of this PFM control signal is for preset according to balanced main circuit.
In system of the present invention, this system comprises multiple described battery pack, connects between battery pack, and balanced main circuit is carrying out the cell in each battery pack, in the process of well-balanced adjustment, also carrying out well-balanced adjustment to multiple battery pack simultaneously.
In system of the present invention, the corresponding cell of each inductance in described balanced main circuit, pass between the value of each inductance is preset, specifically according under dynamic equalization state, cell absorbs and relation between releasing energy and the frequency relation between power switch pipe are derived.
The present invention solves another technical scheme that its technical problem adopts:
A kind of battery pack balancing control method based on dynamic equalization point is provided, comprises the following steps:
In S1, collection battery pack, the magnitude of voltage of cell, is connected in series between cell;
S2, compare the magnitude of voltage of each cell, when the voltage difference of different monomers battery exceedes pre-set threshold value, regulate the frequency of the power switch pipe corresponding with cell respectively, the frequency tracking battery pack of control power switch pipe is in the balance frequency under dynamic equalization state; This balance frequency be energy that every batteries of battery pack discharges in each switch periods equal to the energy of absorption time corresponding power switch pipe frequency;
S3, when the magnitude of voltage of each cell in battery pack reaches unanimity, stop Balance route.
In method of the present invention, in step S2, if the difference of voltage minimum is larger in a monomer battery voltage value and battery pack, then the frequency controlling the power switch pipe of this cell is lower; If the difference of a monomer battery voltage value and voltage minimum is less, then the frequency controlling the power switch pipe of this cell is higher, to improve balancing speed.
In method of the present invention, if there is multiple battery pack, then carrying out the cell in each battery pack, in the process of well-balanced adjustment, also carrying out well-balanced adjustment between multiple battery pack simultaneously.
The beneficial effect that the present invention produces is: the present invention is by the magnitude of voltage of cell in high-accuracy voltage Acquisition Circuit Real-time Collection battery pack, open balanced when certain batteries magnitude of voltage and the difference of monomer battery voltage minimum exceed threshold values, control circuit is according to the frequency of the size adjustment corresponding power switching tube of described voltage difference, the cell making difference larger obtains larger euqalizing current, and finally makes all battery cells in battery pack almost reach balanced simultaneously.The present invention effectively can reduce the number of times of energy transferring in balancing procedure, thus reduces energy consumption, improves balancing speed and efficiency, and the super-charge super-discharge preventing the inconsistency of cell to bring endangers, and extends the useful life of battery pack.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the embodiment of the present invention based on the battery pack balancing control system of dynamic equalization point;
Fig. 2 is the structural representation of another embodiment of the present invention based on the battery pack balancing control system of dynamic equalization point;
Fig. 3 is embodiment of the present invention electric voltage equalization main circuit schematic diagram;
Fig. 4 is embodiment of the present invention sample circuit schematic diagram;
Fig. 5 is the battery pack balancing control method flow chart that the embodiment of the present invention follows the trail of dynamic equalization point.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The battery pack balancing control system of the embodiment of the present invention, as shown in Figure 1, comprises battery pack 10, voltage sampling circuit 20, balanced main circuit 30 and balancing control circuit 40.Battery in battery pack 10 is the battery of one species.Battery pack 10 can be such as lithium battery group or lead accumulator group.The battery pack 10 of the embodiment of the present invention is to comprise the lithium battery of four series connection.Wherein:
Battery pack 10, comprises cell B1, B2, B3 and B4 of multiple series connection;
Voltage sampling circuit 20, is connected with battery pack 10, gathers the magnitude of voltage of each cell;
Balanced main circuit 30, is connected with battery pack 10, for the energy trasfer between cell, as shown in Figure 3, comprises power switch pipe Q1, Q2, Q3, the Q4 corresponding with cell, inductance L 1, L2, L3, L4; The ratio of batteries monomer cell number and power demand switching tube, energy storage inductor quantity is 1:1:1.
Balancing control circuit 40, connect with voltage collection circuit 20 and balanced main circuit 30, for comparing the magnitude of voltage of each cell, when the voltage difference of different monomers battery exceedes pre-set threshold value, regulate the frequency of the power switch pipe corresponding with cell respectively, the frequency tracking battery pack of control power switch pipe is in the balance frequency under dynamic equalization state; When the magnitude of voltage of each cell in battery pack reaches unanimity, stop Balance route; The control strategy in the condition and balancing procedure starting Balance route can be pre-set in balancing control circuit.
Wherein, state when every batteries that dynamic equalization state (i.e. dynamic equalization point) is battery pack discharges equal with the energy absorbed in each switch periods, can think that the magnitude of voltage of each cell is equal under this dynamic equalization state, the frequency of corresponding power switch pipe is equal, and balance frequency is the frequency of power switch pipe under dynamic equalization state.
In the embodiment of the present invention, the corresponding cell of each inductance in described balanced main circuit, pass between the value of each inductance is preset, specifically according under dynamic equalization state, cell absorbs and relation between releasing energy and the frequency relation between power switch pipe are derived, and refers to hereafter.
The operation principle of the balanced main circuit 30 shown in Fig. 3 is as follows:
When switching tube Q1 conducting, the energy of battery B1 is stored in inductance L 1 via B1-Q1-L1-B1 loop, and when Q1 turns off, the energy be stored in L1 is discharged in battery B2, B3 and B4 via L1-B2-B3-B4-D1-L1 loop; When switching tube Q2 conducting, the energy of battery B2 is stored in inductance L 2 via B2-L2-Q2-B2 loop, and when Q2 turns off, the energy be stored in L2 is discharged in battery B1 via L2-D2-B1-L2 loop; When switching tube Q3 conducting, the energy of battery B3 is stored in inductance L 3 via B3-L3-Q3-B3 loop, and when Q3 turns off, the energy be stored in L3 is discharged in battery B1 and B2 via L3-D3-B1-B2-L3 loop; When switching tube Q4 conducting, the energy of battery B4 is stored in inductance L 4 via B4-L4-Q4-B4 loop, and when Q4 turns off, the energy be stored in L4 is discharged in battery B1, B2 and B3 via L4-D4-B1-B2-B3-L4 loop.
Visible, the structure of the balanced main circuit 30 adopted in the embodiment of the present invention has following characteristics, namely when battery cell is in positions different in battery pack, its corresponding energy storage inductor discharge loop is different, the size of euqalizing current is also different, can derive euqalizing current I according to circuit theory n, avrelational expression:
I n , av = I n , on + I n , off = V B n D 2 T n 2 L n * ( 1 + 1 3 ) , n = 1 V B n D 2 T n 2 L n * ( 1 + 1 n - 1 ) , n ≠ 1 . - - - ( 1 )
Wherein be the magnitude of voltage at the n-th batteries two ends, D is duty ratio, T nfor switch periods, L nfor inductance value, I n, onand I n, offrepresent the average current size in switching tube make and break process respectively.
In described balanced main circuit, because the size of euqalizing current is relevant to battery present position, in order to make accessible maximum euqalizing current in every batteries balancing procedure identical, in the present embodiment, independent design is carried out to the value of each inductance.
When switching tube is opened, inductance L nvoltage expression be:
V B n = L n di dt , - - - ( 2 )
Because switch periods is very short, note
di = Δ I n dt = D T n , - - - ( 3 )
The then peak current Δ I of inductance nexpression formula be:
Δ I n = V B n D T n L n = V B n D L n f n , - - - ( 4 )
Wherein, f nswitching tube Q nswitching frequency.
Battery B in one-period nthe energy of release counts W n, according to formula W=UIt, W nexpression formula be:
W n = 1 2 V B n Δ I n DT , - - - ( 5 )
(4) are substituted in (5), can obtain
W n = V B n 2 D 2 2 L n f n 2 . - - - ( 6 )
When all cells work at dynamic equalization point, the energy V that each cell absorbs, ' expression formula is as follows,
W 1 ' = W 2 + 1 2 W 3 + 1 3 W 4 W 2 ' = 1 3 W 1 + 1 2 W 3 + 1 3 W 4 W 3 ' = 1 3 W 1 + 1 3 W 4 W 4 ' = 1 3 W 1 , - - - ( 7 )
When being in dynamic equalization point, the energy that each battery absorbs is equal with the energy of release, i.e. W' n=W n, release
V B 1 2 D 2 2 L 1 f 1 2 = V B 2 2 D 2 2 L 2 f 2 2 + 1 2 V B 3 2 D 2 2 L 3 f 3 2 + 1 3 V B 4 2 D 2 2 L 4 f 4 2 V B 2 D 2 2 L 2 f 2 2 = 1 3 V B 1 2 D 2 2 L 1 f 1 2 + 1 2 V B 3 2 D 2 2 L 3 f 3 2 + 1 3 V B 4 2 D 2 2 L 4 f 4 2 V B 3 2 D 2 2 L 3 f 3 2 = 1 3 V B 1 2 D 2 2 L 1 f 1 2 + 1 3 V B 4 2 D 2 2 L 4 f 4 2 V B 4 2 D 2 2 L 4 f 4 2 = 1 3 V B 1 2 D 2 2 L 1 f 1 2 . - - - ( 8 )
When all battery operated in dynamic equalization point time, f 1=f 2=f 3=f 4, formula (8) can abbreviation be:
L 2 = 3 2 L 1 L 3 = 9 4 L 1 L 4 = 3 L 1 , - - - ( 9 )
In the present embodiment, assuming that euqalizing current size is 3A, duty ratio is 0.38, inductance value L 1=4 μ H then f l=29.281kHz, f 2=29.281kHz, f 3=14.641hHz, f 4=9.760kHz.
As can be seen from formula (1), average isostatic electric current and switching frequency are inversely proportional to.Euqalizing current is larger, and balancing speed is faster, but excessive euqalizing current may cause the energy of battery release or hyperabsorption in a switch periods, then need more switch periods to complete equilibrium.To too much energy transferring number of times be caused, thus reduce equalization efficiency and balancing speed.Consider, the present embodiment gets its mean value f 0=(f 1+ f 2+ f 3+ f 4)/4=20.741kHz, as the frequency values of dynamic equalization point, effectively can reduce the number of times of energy transferring, thus reduces energy consumption, improves equalization efficiency.
Fig. 4 is the sampling with high precision circuit theory diagrams that the embodiment of the present invention adopts, within voltage sample precision can be brought up to 10mV by the high precision operating amplifier of wherein difference channel use and precision resistance.
The concrete derivation of duty ratio D is as follows:
The balanced main circuit 30 of the embodiment of the present invention designs based on DC-DC converter.DC-DC converter has two kinds of mode of operations: continuous current mode (CCM) and discontinuous conduct mode (DCM).In order to prevent hysteresis & saturation, under DC-DC converter must operate at discontinuous conduct mode.Under discontinuous conduct mode, inductance can discharge absorbed energy completely when switching tube disconnects.Under DC-DC converter works in discontinuous mode, duty ratio need meet some requirements, and derivation is as follows.
With switching tube Q n(n=1 ..., N) L nthe voltage at two ends is designated as when switching tube turns off, inductance L nthe voltage at two ends is designated as concerning first switching tube, equal the voltage sum of following all batteries; Concerning other switching tube, equal above all cell voltage sums.T nand T crrefer to switching tube Q respectively nswitch periods and inductive current reduce to zero moment.
The expression formula of inductive current is as follows:
i L n = V B n L n t , 0 &le; t < D T n V B n L n D T n - V O n L n ( t - D T n ) , D T n &le; t < T cr 0 , T cr &le; t &le; T n , - - - ( 10 )
Due to, work as t=T crtime, inductive current t=T ntime,
V B n L n D T n - V O n L n ( T n - D T n ) < 0 , - - - ( 11 )
Further derivation can obtain
D < V O n V B n + V O n = 1 V B n V O n + 1 . - - - ( 12 )
Under guaranteeing that switching tube works in DCM pattern, no matter value be how many, inequality (12) must be set up.According to main circuit, inequality (12) can be divided into following four kinds of situation discussion.
n = 1 , D < 1 V B 1 V B 2 + V B 3 + V B 4 , - - - ( 13 )
n = 2 , D < 1 V B n V B 1 + 1 , - - - ( 14 )
n = 3 , D < 1 V B 3 V B 1 + V B 2 + 1 - - - ( 15 )
n = 4 , D < 1 V B 4 V B 1 + V B 2 + V B 3 + 1 . - - - ( 16 )
Obviously, when duty ratio meets inequality (14), inequality (13), (15), (16) must also be met.Operating voltage range due to lithium battery is 2.5V-3.65V, setting under the critical value D<0.4065 that just can obtain duty ratio thinks and guarantees that converter works in discontinuous conduct mode, duty ratio must be less than 0.4056.The value that the embodiment of the present invention gets duty ratio D is 0.38.
As shown in Figure 1, the balancing control circuit 40 of the embodiment of the present invention comprises microprocessor 41 and drive circuit 42, and microprocessor 41 is connected with voltage collection circuit 20, and drive circuit 42 connects with the power switch pipe of balanced main circuit 30.Each power switch pipe may correspond to a drive circuit.
In one embodiment of the present of invention, if this system comprises multiple battery pack, connect between battery pack, then balanced main circuit 30 is carrying out the cell in each battery pack, in the process of well-balanced adjustment, also carrying out well-balanced adjustment to multiple battery pack simultaneously.In a preferred embodiment of the present invention, the corresponding equalizing circuit of each battery pack, is also connected with an equalizing circuit, for the well-balanced adjustment between battery pack between multiple battery pack.Be understandable that, when there being multiple equalizing circuit, these equalizing circuits can be integrated in a module.
When needing to carry out Balance route to a large amount of series batteries, need transmit control signal to roads up to a hundred drive circuit, realizing the Balance route of a large amount of series battery.As shown in Figure 2, in another embodiment of the present invention, utilize the advantage that FPGA output interface is many, the speed of service is fast, FPGA module 43 is increased in balancing control circuit 40, be connected between microprocessor 41 and drive circuit 42, microprocessor sends PFM(pulse frequency modulated PulseFrequencyModulation by this FPGA module to drive circuit) control signal.The frequency of this PFM control signal changes with input signal amplitude, and its duty ratio is constant.
The embodiment of the present invention follows the trail of the battery pack balancing control method of dynamic equalization point, as shown in Figure 5, comprises the following steps:
In S501, collection battery pack, the magnitude of voltage of cell, is connected in series between cell;
S502, compare the magnitude of voltage of each cell;
S503, judge that the voltage difference of different monomers battery enough exceedes pre-set threshold value;
If when the voltage difference of S504 different monomers battery exceedes pre-set threshold value, regulate the frequency of the power switch pipe corresponding with cell respectively, the frequency tracking battery pack of control power switch pipe is in the balance frequency under dynamic equalization state; This balance frequency be energy that every batteries of battery pack discharges in each switch periods equal to the energy of absorption time corresponding power switch pipe frequency;
When the magnitude of voltage of each cell in battery pack reaches unanimity, then stop Balance route.
In step S502, if the difference of voltage minimum is larger in a monomer battery voltage value and battery pack, then the frequency controlling the power switch pipe of this cell is lower; If the difference of a monomer battery voltage value and voltage minimum is less, then the frequency controlling the power switch pipe of this cell is higher, to improve balancing speed.
If there is multiple battery pack, then carrying out the cell in each battery pack, in the process of well-balanced adjustment, also carrying out well-balanced adjustment to multiple battery pack simultaneously.
The battery pack balancing control method of the tracking dynamic equalization point of the embodiment of the present invention passes through the magnitude of voltage of cell in high-accuracy voltage Acquisition Circuit Real-time Collection battery pack, open balanced when certain batteries magnitude of voltage and the difference of monomer battery voltage minimum exceed threshold values, control circuit is according to the frequency of the size adjustment corresponding power switching tube of described voltage difference, the cell making difference larger obtains larger euqalizing current, all battery cells in battery pack can be made almost to reach balanced simultaneously, improve balancing speed and efficiency, the super-charge super-discharge harm preventing the inconsistency of cell to bring, extend the useful life of battery pack.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.

Claims (7)

1., based on a battery pack balancing control system for dynamic equalization point, it is characterized in that, comprising:
Battery pack, comprises the cell of multiple series connection;
Voltage sampling circuit, is connected with battery pack, gathers the magnitude of voltage of each cell;
Balanced main circuit, is connected with battery pack, for the energy trasfer between cell, comprises the power switch pipe corresponding with cell and inductance; Independent design is carried out to the value of each inductance, identical to make often to save accessible maximum euqalizing current in cell balancing procedure; In this balanced main circuit, euqalizing current relational expression be:
Wherein be the magnitude of voltage at the n-th joint cell two ends, D is duty ratio, for switch periods, for inductance value, with represent the average current size in power switch pipe make and break process respectively;
Balancing control circuit, connect with voltage sampling circuit and balanced main circuit, for comparing the magnitude of voltage of each cell, when the voltage difference of different monomers battery exceedes pre-set threshold value, regulate the frequency of the power switch pipe corresponding with cell respectively, control the frequency tracking battery pack of power switch pipe be in dynamic equalization state under balance frequency, the frequency values of dynamic equalization point is the mean value of multiple power switch pipe frequency; When the magnitude of voltage of each cell in battery pack reaches unanimity, stop Balance route; If the difference of voltage minimum is larger in a monomer battery voltage value and battery pack, then the frequency controlling the power switch pipe of this cell is lower; If the difference of a monomer battery voltage value and voltage minimum is less, then the frequency controlling the power switch pipe of this cell is higher, to improve balancing speed;
Wherein, dynamic equalization state be every batteries of battery pack discharge in each switch periods with absorb energy equal time state, balance frequency is the frequency of power switch pipe under dynamic equalization state.
2. system according to claim 1, is characterized in that, described balancing control circuit comprises microprocessor and drive circuit, and microprocessor is connected with voltage sampling circuit, and drive circuit connects with the power switch pipe of balanced main circuit.
3. system according to claim 2, it is characterized in that, this balancing control circuit also comprises FPGA module, be connected between microprocessor and drive circuit, microprocessor sends PFM control signal by this FPGA module to drive circuit, and the duty ratio of this PFM control signal is for preset according to balanced main circuit.
4. system according to claim 3, it is characterized in that, this system comprises multiple described battery pack, connects between battery pack, balanced main circuit is carrying out the cell in each battery pack, in the process of well-balanced adjustment, also carrying out well-balanced adjustment to multiple battery pack simultaneously.
5. system according to claim 4, it is characterized in that, the corresponding cell of each inductance in described balanced main circuit, pass between the value of each inductance is preset, specifically according under dynamic equalization state, cell absorbs and relation between releasing energy and the frequency relation between power switch pipe are derived.
6., based on a battery pack balancing control method for dynamic equalization point, it is characterized in that, comprise the following steps:
In S1, collection battery pack, the magnitude of voltage of cell, is connected in series between cell;
S2, compare the magnitude of voltage of each cell, when the voltage difference of different monomers battery exceedes pre-set threshold value, regulate the frequency of the power switch pipe in the balanced main circuit corresponding with cell respectively, the frequency tracking battery pack of control power switch pipe is in the balance frequency under dynamic equalization state; This balance frequency be battery pack often save the energy that discharges in each switch periods of cell equal to the energy of absorption time corresponding power switch pipe frequency; Independent design is carried out to the value of each inductance in balanced main circuit, identical to make often to save accessible maximum euqalizing current in cell balancing procedure; In this balanced main circuit, euqalizing current relational expression be:
Wherein be the magnitude of voltage at the n-th joint cell two ends, D is duty ratio, for switch periods, for inductance value, with represent the average current size in power switch pipe make and break process respectively;
S3, when the magnitude of voltage of each cell in battery pack reaches unanimity, stop Balance route;
In step S2, if the difference of voltage minimum is larger in a monomer battery voltage value and battery pack, then the frequency controlling the power switch pipe of this cell is lower; If the difference of a monomer battery voltage value and voltage minimum is less, then the frequency controlling the power switch pipe of this cell is higher, to improve balancing speed.
7. method according to claim 6, is characterized in that, if there is multiple battery pack, is then carrying out the cell in each battery pack, in the process of well-balanced adjustment, also carrying out well-balanced adjustment between multiple battery pack simultaneously.
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