CN107733007A - A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods - Google Patents

A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods Download PDF

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Publication number
CN107733007A
CN107733007A CN201710894144.XA CN201710894144A CN107733007A CN 107733007 A CN107733007 A CN 107733007A CN 201710894144 A CN201710894144 A CN 201710894144A CN 107733007 A CN107733007 A CN 107733007A
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China
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circuit
cell
balanced
battery
sub
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Chinese (zh)
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郭向伟
华显
张丽
张涛
王允建
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Henan University of Technology
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Henan University of Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0019Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22Balancing the charge of battery modules
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0026Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially using safety or protection circuits, e.g. overcharge/discharge disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0027Stations for charging mobile units, e.g. of electric vehicles, of mobile telephones
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302Overcharge protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306Overdischarge protection
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/14Plug-in electric vehicles

Abstract

The invention discloses a kind of direct equalizing circuit of battery pack Bi-objective.Series battery includes at least three cells, it is divided into two parts up and down, each cell sub-circuit balanced with one is connected, balanced sub-circuit is made up of two MOSFET and energy storage inductors, series battery and balanced sub-circuit are connected across between VCC and GND, each balanced sub-circuit is connected with control circuit again, realizes the direct equilibrium to equalization target.Control circuit is used as balanced index using the terminal voltage of cell and SOC simultaneously, and within a balanced cycle, the terminal voltage to cell and SOC are carried out balanced stage by stage, by the break-make for two MOSFET for controlling balanced sub-circuit, acted on using the energy storage of energy storage inductor, realize that cell terminal voltage and SOC Bi-objective are balanced.The balanced management system of the equalizing circuit and balance policy energy storage equipment suitable for hybrid vehicle, pure electric automobile or storage station.

Description

A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods
Technical field
The present invention relates to a kind of direct balancing technique of series battery Bi-objective and equalization methods, suitable for hybrid power electricity The battery management system of energy storage equipment in electrical automobile, pure electric automobile or storage station.
Background technology
Because cell capacity is limited, and monomer voltage is relatively low, so power battery pack is typically by multiple monomers electricity Pond connection in series-parallel is formed to meet requirement.Asked due to inevitable inconsistency be present between the cell of same model Topic, will have a strong impact on battery pack service life, and easily cause to occur overcharging and cross to put phenomenon.Series battery is through excessive After individual charge and discharge cycles, three kinds of situations substantially occur in the distribution of each cell residual capacity:The residue of individual monomers battery Capacity is higher;The residual capacity of individual monomers battery is relatively low;The residual capacity of individual monomers battery is higher and individual monomers battery Residual capacity it is relatively low.
For the above situation, domestic and foreign scholars propose the solution of oneself.Such as the surplus of individual monomers battery The higher situation of covolume amount, has researcher to propose parallel resistance shunting, and it is by controlling corresponding switching device by residue The energy of the higher battery module of capacity is fallen by resistance consumption, and this method wastes energy, and in balancing procedure In generate substantial amounts of heat, add battery thermal management load.Also researcher proposes bi-directional DC-DC equalization, coaxial change The equalizing circuits such as depressor equalization, these circuits all employ transformer, add the cost of equalizing circuit.
The method of Li-ion batteries piles Balance route at present, the Expenditure Levels according to circuit in balancing procedure to energy, can It is divided into energy-dissipating and the major class of energy non-dissipative type two;Classify according to equalization function, can be divided into charge balancing, equalization discharge and Dynamic equalization.Charge balancing refers to the equilibrium in charging process, is usually opened when batteries monomer voltage reaches setting value Begin balanced, overcharge is prevented by reducing charging current;Equalization discharge refers to the equilibrium in discharge process, by residual energy Low cell supplement energy is measured to prevent overdischarge;Dynamic equalization mode combines the excellent of charge balancing and equalization discharge Point, refer to the equilibrium carried out in whole charge and discharge process to battery pack.Nowadays existing substantial amounts of balanced topological sum control strategy It is suggested.Research for equalizing circuit control strategy, Kobzev, Tae-hoon Kim etc. are using battery terminal voltage as Weighing apparatus index is come to battery pack balancing, but the quality of battery performance can not only rely on the height of voltage to weigh, capacity in battery pack Low battery is in charging or after charging, and its terminal voltage may be higher than other batteries, if using this equalization methods, then Balanced result is the low battery of the capacity battery supplement energy high to capacity, increases the difference of each battery capacity in battery pack Away from.Danielson, Huang W et al. think that be to work as electric current under different operating modes as balanced variable advantage using SOC becomes suddenly Battery charge state will not be caused to fluctuate during change so that equalization target change is more stable, advantageously reduces balanced concussion to electricity The influence in pond, but this equalization methods can only solve capacity is larger in battery pack battery because of long-term undercharge and under performance Drop problem, the gap of each battery actual capacity can not be reduced or eliminated.In general, the research of Balance route strategy is more at present Balanced index is used as using single terminal voltage or single SOC.
The content of the invention
The purpose of the present invention is to ensure battery using a kind of equalizing circuit in the battery management system of series battery Cell in group occurs without overcharge and overdischarge during charging and discharging, improves the unbalanced existing of series battery As, the active volume of battery pack is improved, reduces maintenance and the replacement cycle of series battery, extends the service life of battery pack, Reduce hybrid vehicle, electric automobile and the operating cost of storage station.In charging process, when any one in battery pack When monomer energy is too high, it can give battery pack other all residual monomers the balancing energy of this monomer;In discharge process, when When any one monomer energy is too low in battery pack, the balancing energy of the other all residual monomers of battery pack can be given to this energy Measure too low monomer.And Balance route strategy is formulated as balanced index using SOC, terminal voltage simultaneously, by right stage by stage SOC, terminal voltage carry out equilibrium, inherently improve the uniformity of power battery pack cell.
To achieve these goals, the technical scheme is that.
The direct equalizing circuit of battery pack Bi-objective is made up of series battery and balanced sub-circuit.Wherein, series-connected cell Group is divided into upper and lower two parts, and upper part cell is upper battery, and lower part cell is lower battery;Work as cell When total n is even number, top and the bottom cell number is (n/2), when cell sum n is odd number, upper cell Number is [(n+1)/2], and lower monomer cell number is [(n-1)/2];Cell is from top to bottom respectively designated as B1、B2、B3、…… Bn, B1Positive pole meet VCC, BnNegative pole meet GND.Each cell sub-circuit balanced with one is connected.
Cell can be the secondary cells such as lead-acid battery, lithium ion battery, Ni-MH battery, ultracapacitor.
Preferably, each balanced sub-circuit is by two MOSFET with fly-wheel diode and energy storage inductor L structures Into upper bridge arm MOSFET is Qu, lower bridge arm MOSFET is Qd, QuSource electrode and QdDrain electrode be connected with energy storage inductor L one end;Qu Drain electrode as output end a, QuGrid as output end b, QdGrid as output end c, QdSource electrode as output end d, The L other end is as output end e;Output end b, c are connected with control circuit, make turning on and off by control circuit for MOSFET Control;With the balanced sub-circuit of upper cell connection, a ends are connected with corresponding cell positive pole, e ends and corresponding cell Negative pole is connected, d terminations GND;With the balanced sub-circuit of lower cell connection, e ends are connected with corresponding cell positive pole, d ends It is connected with corresponding cell negative pole, a terminations VCC;Total balanced sub-circuit a terminations VCC, d terminate GND, and battery is with in e terminations The common point k of battery.
The operation principle of balanced sub-circuit is as follows.
In charge and discharge process, if located in monomer B more than k pointsiNeed to carry out equalization discharge, by controlling SiIt is upper Bridge arm switching tube QuiConducting, BiDischarge for LiStore energy;QuiTurned it off after opening certain time, now electric current passes through BiIt is right Bridge arm switching tube Q under the balanced sub-circuit answereddiFly-wheel diode, LiAnd Bi+1、Bi+2……Bn, LiRelease energy to Bi+1、 Bi+2……Bn, energy is realized from BiTo Bi+1、Bi+2……BnTransfer.If located in the monomer B below k pointsjNeed to carry out Equalization discharge, in a PWM cycle, make BjBridge arm MOSFET Q under corresponding balanced sub-circuitdjConducting, then electric current passes through Qdj、BjCorresponding balanced sub-circuit energy storage inductor LjAnd Bj, BjDischarge for LjStore energy;QdjMake it after opening certain time Shut-off, now electric current passes through BjBridge arm MOSFET Q on corresponding balanced sub-circuitujFly-wheel diode, LjAnd B1、B2…… Bi-1, LjRelease energy to B1、B2……Bi-1, energy is realized from BjTo B1、B2……Bi-1Transfer.
If located in monomer B more than k pointsiNeed to carry out charge balancing, by controlling SiLower bridge arm switching tube QdiLead It is logical, Bi+1、Bi+2……BnDischarge for LiStore energy;QdiTurned it off after opening certain time, now electric current passes through BiIt is corresponding Bridge arm switching tube Q on balanced sub-circuituiFly-wheel diode, LiAnd Bi+1、Bi+2……Bn, LiRelease energy to Bi, realize energy Measure from Bi+1、Bi+2……BnTo BiTransfer.If located in the monomer B below k pointsiNeed to carry out charge balancing, in a PWM In cycle, make BjBridge arm MOSFET Q on corresponding balanced sub-circuitujConducting, then electric current passes through Quj、BjCorresponding balanced son electricity Road energy storage inductor LjAnd B1、B2……Bj-1, B1、B2……Bj-1Discharge for LjStore energy;QujMake it after opening certain time Shut-off, now electric current passes through BjBridge arm MOSFET Q under corresponding balanced sub-circuitdjFly-wheel diode, LjAnd Bj, LjDischarge energy Measure to Bj, energy is realized from B1、B2……Bj-1To BjTransfer.
Balanced index is established based on SOC, terminal voltage, equilibrium is carried out to it stage by stage in a balanced cycle, it is final to realize Each cell SOC, the consistent sexual satisfaction design requirement of terminal voltage in battery pack.
Specific Balance route strategy includes herein below:
S1, the balanced index of setting:Whether equalizing circuit is met by the inconsistency of each battery SOC of detection circuit judges, terminal voltage Condition of work;Such as meet equilibrium condition, equalizing circuit is started working;Equilibrium condition is such as unsatisfactory for, equalizing circuit does not work.
S2, balancing procedure include several balanced cycles, and the time of each balanced cycle T/2 is used for electric voltage equalization, T/2 times For SOC balance.
S3, each balanced end cycle, detection circuit detect and judge whether each battery SOC, terminal voltage meet again Weighing apparatus condition;
S4, repeat step S2, until cell inconsistency is unsatisfactory for equalizing circuit condition of work, equalizing circuit stops work Make, balancing procedure terminates.
Further, the control circuit is controlled by output control signal to balanced sub-circuit, the control letter Number frequency size be according to the inductance value of the energy storage inductor of balanced sub-circuit, MOSFET switching loss, cell electricity Pond terminal voltage, cell monomer capacity depending on.
Further, the dutycycle of the control signal of the control circuit output can make energy storage inductor in each signal week Reset in phase, i.e. the electric current of energy storage inductor is first started from scratch risings, last and drop to zero.
Further, in step S2, in the equalizing circuit course of work, by reducing cell corresponding to SOC maximums Open-circuit voltage, increase terminal voltage minimum value corresponding to cell terminal voltage so thatReduce, gradually meet battery pack Coincident indicator.When each cell in battery packWhen reaching unanimity, you can realize that cell moves State property can it is consistent.
The equalization methods of lithium ion battery provided by the invention are applicable to various energy-dissipating equalizing circuits and energy Nondissipative equalization circuit.
It is also applied for capacitor type equalizing circuit, converter type equalizing circuit and transformer type equalizing circuit.
The present invention can guarantee that each battery exists due to using above-mentioned balancing technique in series battery cells management system Overcharge and overdischarge are occurred without during charging and discharging, while inconsistency index, energy are used as using battery terminal voltage, SOC Enough uniformity for inherently improving cell in battery pack;By equilibrium stage by stage, do not increasing sequential operation amount and control On the premise of complexity processed, while realize that terminal voltage and SOC Bi-objectives are balanced.This control strategy method is reliable, on-line operation amount It is small, cell safety reliability is remarkably improved, energy content of battery utilization rate is improved, extends battery life, reduction hybrid vehicle, The cost of energy-storage system of accumulator in electric automobile and power station.
Brief description of the drawings
Fig. 1 is the equalizing circuit schematic diagram in the present invention.
Fig. 2 is the balanced sub-circuit schematic diagram in the present invention.
Fig. 3 is the balance policy schematic diagram in the present invention.
Fig. 4 is the course of work schematic diagram of equalizing circuit in four monomer series-connected battery pack charging processes.
Fig. 5 is the course of work schematic diagram of equalizing circuit during four monomer series-connected battery power discharges.
Embodiment
The embodiment of the present invention is elaborated below in conjunction with the accompanying drawings.
Fig. 1 is equalizing circuit schematic diagram.Wherein, series battery is divided into upper and lower two parts, top half cell For upper battery, the latter half cell is lower battery;When cell sum n is even number, top and the bottom cell number It is (n/2), when cell sum n is odd number, upper cell number is [(n+1)/2], and lower monomer cell number is [(n- 1)/2];Cell is from top to bottom respectively designated as B1、B2、B3、……Bn, B1Positive pole meet VCC, BnNegative pole meet GND.Often Individual cell sub-circuit balanced with one is connected.
Fig. 2 is balanced sub-circuit schematic diagram.Each balanced sub-circuit is by two MOSFET with fly-wheel diode and storage Energy inductance L is formed, and upper bridge arm MOSFET is Qu, lower bridge arm MOSFET is Qd, QuSource electrode and QdDrain electrode and energy storage inductor L One end is connected;QuDrain electrode as output end a, QuGrid as output end b, QdGrid as output end c, QdSource electrode As output end d, the L other end is as output end e;Output end b, c are connected with control circuit, make opening and closing for MOSFET It is disconnected to be controlled by control circuit;With the balanced sub-circuit of upper cell connection, a ends are connected with corresponding cell positive pole, e ends and Corresponding cell negative pole is connected, d terminations GND;With the balanced sub-circuit of lower cell connection, e ends and corresponding cell Positive pole is connected, and d ends are connected with corresponding cell negative pole, a terminations VCC.
Fig. 3 is Bi-objective balance policy schematic diagram stage by stage.Bi-objective refers to simultaneously as equilibrium refer to using SOC, terminal voltage Mark, passes through realizationEquilibrium, to ensure the uniformity of the working condition of each cell of battery pack substantially. Refer to stage by stage in each balanced cycle, have half period be used for realize terminal voltage equilibrium, this process by terminal voltage most Low cell carries out charge balancing realization;There is half period to be used for realizing SOC balance, i.e. open-circuit voltage is balanced, this process Equalization discharge realization is carried out by open-circuit voltage highest cell.By detection circuit judges each battery SOCs, terminal voltage Whether inconsistency meets equalizing circuit condition of work;Such as meet equilibrium condition, equalizing circuit is started working;Such as it is unsatisfactory for equilibrium Condition, equalizing circuit do not work.
Each balanced end cycle, detection circuit detect and judge whether each battery SOC, terminal voltage meet balanced electricity again Road condition of work.One balanced end cycle, if each cell SOC, terminal voltage meet equalizing circuit condition of work, balanced electricity Road works on, if being unsatisfactory for equalizing circuit condition of work, equalizing circuit is stopped, and balancing procedure terminates.
Fig. 4, Fig. 5 are charge and discharge process equalizing circuit operation principle schematic diagrams, by taking cell number n=4 as an example,
Fig. 4 is to B1The process of equalization discharge is carried out, in a PWM cycle, makes B1Bridge arm on corresponding balanced sub-circuit MOSFET Qu1Turn on, then electric current iu1Pass through Qu1、B1Corresponding balanced sub-circuit energy storage inductor L1And B1, B1Discharge for L1Storage Energy;Qu1Turned it off after opening certain time, now electric current passes through B1Bridge arm MOSFET Q under corresponding balanced sub-circuitd1's Fly-wheel diode, L1And B2、B3、B4, L1Release energy to B2、B3、B4, energy is realized from B1To B2、B3、B4Transfer.
Fig. 5 is to B3The process of charge balancing is carried out, in a PWM cycle, makes B3Bridge arm on corresponding balanced sub-circuit MOSFET Qu3Conducting, then electric current passes through Qu3、B3Corresponding balanced sub-circuit energy storage inductor L3And B1、B2, B1、B2Discharge for L3 Store energy;Qu3Turned it off after opening certain time, now electric current passes through B3Bridge arm MOSFET under corresponding balanced sub-circuit Qd3Fly-wheel diode, L3And B3, L3Release energy to B3, energy is realized from B1、B2To B3Transfer.

Claims (9)

1. a kind of direct equalizing circuit of battery pack Bi-objective, including the series battery, being in series by multiple cells Weigh sub-circuit and control circuit, it is characterised in that:The quantity of the cell is no less than 3, and each cell is with one Individual balanced sub-circuit connection, each balanced sub-circuit are connected with control circuit;The series battery is divided into upper part with Part, the quantity of the cell of upper part are more identical than the quantity of lower part cell or more 1;The monomer electricity of upper part The balanced sub-circuit that pond is connected is connected with the GND ends of series battery again, and the equilibrium that the cell of lower part is connected is sub Circuit is connected with the VCC ends of series battery again.
2. the direct equalizing circuit of battery pack Bi-objective according to claim 1, it is characterised in that:The balanced sub-circuit by Two MOSFET with fly-wheel diode and energy storage inductor are formed by connecting, and control circuit is connected with two MOSFET grid; The drain electrode with one of MOSFET, the second end of energy storage inductor are connected respectively at the positive and negative both ends of cell;Another MOSFET source electrode and the GND ends of series battery or VCC ends connect.
3. the direct equalizing circuit of battery pack Bi-objective according to claim 1, it is characterised in that:The cell is two Primary cell.
A kind of 4. equalization methods of Li-ion batteries piles, it is characterised in that:It is battery pack Bi-objective according to claim 1 Direct equalizing circuit carries out balanced to Li-ion batteries piles.
5. the equalization methods of Li-ion batteries piles according to claim 4, it is characterised in that comprise the following steps:
S1, by equalizing circuit with detection circuit be connected, by the battery terminal voltage of each cell of detection circuit judges, battery Whether SOC inconsistency meets equilibrium condition;
S2, equilibrium condition is such as unsatisfactory for, equalizing circuit does not work;Such as meet equilibrium condition, equalizing circuit is controlled by control circuit Start working;
S3, balancing procedure include several balanced cycle Ts, and the battery terminal voltage is the preceding half period in balanced cycle T T/2 carries out equilibrium, and the battery SOC is that the second half of the cycle T/2 in balanced cycle T carries out equilibrium;
S4, each balanced end cycle, detection circuit detect and judge the battery terminal voltage of each cell, battery SOC again Inconsistency whether meet equilibrium condition;
S5, and so on, until the inconsistency of cell is unsatisfactory for equalizing circuit condition of work, equalizing circuit stops work Make.
6. the equalization methods of Li-ion batteries piles according to claim 5, it is characterised in that:The control circuit passes through defeated Go out control signal to be controlled balanced sub-circuit, the frequency size of the control signal is the energy storage electricity according to balanced sub-circuit The inductance value of sense, MOSFET switching loss, the battery terminal voltage of cell, cell monomer capacity depending on.
7. the equalization methods of Li-ion batteries piles according to claim 6, it is characterised in that:The control circuit output The dutycycle of control signal can be such that energy storage inductor is resetted within each signal period.
8. the equalization methods of Li-ion batteries piles according to claim 5, it is characterised in that:Described equalization methods application In energy-dissipating equalizing circuit and energy non-dissipative type equalizing circuit.
9. the equalization methods of Li-ion batteries piles according to claim 5, it is characterised in that:Described equalization methods application In capacitor type equalizing circuit, converter type equalizing circuit and transformer type equalizing circuit.
CN201710894144.XA 2017-09-28 2017-09-28 A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods Pending CN107733007A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110758179A (en) * 2019-11-11 2020-02-07 河南理工大学 LC-L-based series battery pack equalization circuit and equalization method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110758179A (en) * 2019-11-11 2020-02-07 河南理工大学 LC-L-based series battery pack equalization circuit and equalization method

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