CN110729789A - Series battery pack equalization circuit and equalization method based on flyback converter - Google Patents

Series battery pack equalization circuit and equalization method based on flyback converter Download PDF

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CN110729789A
CN110729789A CN201911018431.XA CN201911018431A CN110729789A CN 110729789 A CN110729789 A CN 110729789A CN 201911018431 A CN201911018431 A CN 201911018431A CN 110729789 A CN110729789 A CN 110729789A
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flyback converter
battery pack
circuit
primary side
equalization
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郭向伟
耿佳豪
卜旭辉
胡治国
许孝卓
谢东垒
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Henan University of Technology
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Henan University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a series battery pack equalization circuit and an equalization method based on a flyback converter, wherein the battery pack consists of n single batteries, and the equalization circuit comprises 2n +1 MOS (metal oxide semiconductor) tubes, 2n diodes, the flyback converter and an RCD (resistor capacitor diode) buffer circuit. The series battery pack is integrally connected with an MOS (metal oxide semiconductor) tube in series and is connected with the primary side of the flyback converter; the positive electrode and the negative electrode of each single battery are respectively connected with an MOS tube and connected with the secondary side of the flyback converter; the RCD buffer circuit is connected with the primary side of the flyback converter in parallel. The first advantage of the equalization topology is that the entire equalization circuit only needs one flyback converter for energy transfer, which can greatly reduce the volume of the equalization circuit; the second advantage is that the expansion is easy, and when the number of the battery pack single bodies is changed, only the number of the corresponding MOS tubes needs to be increased or decreased.

Description

Series battery pack equalization circuit and equalization method based on flyback converter
Technical Field
The invention belongs to the technical field of battery equalization, and relates to a series battery pack equalization circuit and an equalization method based on a flyback converter, which are suitable for a battery management system in a new energy automobile.
Background
In recent years, new energy automobiles are becoming more popular with more and more severe environmental pollution and increasingly scarce petroleum resources. The lithium battery has the advantages of high energy density, large output power, long cycle life and the like, and is gradually the main power source of new energy automobiles. Since the voltage of the single lithium battery is low, the batteries are generally connected in series to form a battery pack. Due to the influence of factors such as production technology and use environment, the single battery is unbalanced after being charged and discharged circularly for a period of time, so that the energy utilization rate of the battery pack is reduced, the service life of the battery pack is shortened, and overcharge and overdischarge phenomena are easily caused. Therefore, the equalization technology has important significance for improving the inconsistency of the battery.
Currently, the main equalization methods are classified into an active equalization type and a passive equalization type: the passive equalization realizes equalization by consuming energy through a parallel resistor, and the equalization structure is simple, but the energy loss is serious, and the heat dissipation problem is difficult to solve; the active equalization transfers energy from the high-voltage single battery to the low-voltage single battery through an inductor, a capacitor and a converter, so that the equalization of the battery pack is realized, and the equalization is also called as non-energy consumption equalization or lossless equalization. Although the method based on inductance equalization has high equalization efficiency, the circuit structure is complex, the number of switching tubes and inductors is large, and the reduction of the volume of an equalization system is not facilitated; the equalization time of the equalization method based on the capacitor is long, and particularly when the voltage difference between the battery monomers is not large; although the equalization path can be shortened and the equalization efficiency can be improved by the transformer-based equalization method, each battery of the transformer-based equalization method needs a transformer, so that the system is large in size, needs more components, is complex in control signal and is high in system cost.
Disclosure of Invention
The invention aims to overcome the technical problems in the prior art, provides a series battery pack balancing circuit and a balancing method based on a flyback converter, improves the unbalance phenomenon of the series battery pack and prolongs the service life of the battery pack.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a series battery pack equalization circuit based on a flyback converter, wherein the series battery pack consists of n single batteries; the equalizing circuit comprises 2n +1 MOS tubes, 2n diodes, a flyback converter and an RCD buffer circuit; the series battery pack is integrally connected with an MOS (metal oxide semiconductor) tube in series and is connected with the primary side of the flyback converter; the positive electrode and the negative electrode of each single battery are respectively connected with an MOS tube and connected with the secondary side of the flyback converter; the RCD buffer circuit is connected with the primary side of the flyback converter in parallel.
The RCD buffer circuit is connected in parallel with the primary side of the flyback converter and used for eliminating impulse voltage generated by the leakage flux of the flyback converter to the MOS tube. The whole equalizing circuit only needs one flyback converter for energy transfer, so that the size of the equalizing circuit can be greatly reduced; the expansion is easy, and when the number of the battery pack single bodies is changed, only the number of the corresponding MOS tubes needs to be increased or decreased.
The invention also comprises an equalization method of the series battery pack equalization circuit based on the flyback converter, which comprises the following steps:
each single battery in the series battery pack is marked as B in sequence1，B2，B3，…，Bn(ii) a Each MOS tube in the equalizing circuit is marked as S in turn0，S1，S2，…，S2n(ii) a The balancing circuit aims to transfer the energy of the whole battery pack to a single body with the lowest SOC (State of Charge) in the charging and discharging process so that the SOC of each single body of the whole battery pack tends to be consistent.
The above object is achieved by the steps of:
when the single battery BiWhen the SOC is lowest and meets the working condition of the equalizing circuit, the equalizing circuit starts to work;
the equalization process is divided into three phases: in the first stage, MOS tube S at primary side of flyback converter2nOpen, the whole series battery toThe primary inductor stores energy; second stage, MOS tube S of primary side of flyback converter2nWhen the flyback converter is closed, the RCD buffer circuit absorbs the leakage energy of the flyback converter, and the impact voltage of the flyback converter on the primary side is reduced; third stage, opening monomer BiCorresponding MOS transistor S2i-2And S2i-1The secondary side inductor has induced electromotive force of 'up positive and down negative', and the secondary side inductor can charge the monomer Bi, so that energy transfer is realized.
In order to implement the three stages smoothly, parameters of core components of the circuit need to be calculated and analyzed, and appropriate circuit parameters need to be set.
Firstly, the capacitance and resistance of the absorption circuit are analyzed and calculated. If R × C is too small, the capacitor is charged quickly, leakage inductance energy is consumed quickly, and the resistor consumes primary side excitation inductance energy before the primary side MOS tube is switched on. If R is too large, the capacitor is charged slowly, so that the secondary side of the transformer is conducted in a delayed mode, and part of energy of the primary side excitation inductor is consumed by the RC circuit. Therefore, an appropriate value of R × C is selected to consume only the leakage inductance energy. Here, the value is obtained by using the formula (1).
Wherein VCThe voltage of the absorption capacitor is usually 2-2.5 times of the reflection voltage; Δ VCFor voltage fluctuations on the capacitor, according to VCSelecting a proper value; f. ofTIs the operating frequency of the flyback converter.
Secondly, when the equalizing circuit works, in order to prevent the hysteresis saturation phenomenon, the flyback converter must work in a current discontinuous mode. The number of turns of the primary winding of the transformer is recorded as NPAnd the number of turns of the secondary side is marked as NS(ii) a Primary side inductance is noted as LPSecondary inductance is noted as Ls(ii) a The primary current is denoted as IPAnd the secondary current is denoted as IS(ii) a The primary voltage is denoted as VPAnd secondary voltage is denoted as VS(ii) a The switching period is recorded as T; the rise time of the primary current in one cycle is recorded as TonAnd the fall time of the secondary current is recorded as ToffThe dead time is denoted as Td(ii) a Secondary side voltage is reflected to the originalThe voltage of the side is denoted as Vf. When the primary side MOS tube of the transformer is turned off, the secondary side voltage is positive at the moment and negative at the moment, and the primary side inductor can induce a voltage which is positive at the bottom and negative at the top, namely a reflected voltage Vf。
Figure BDA0002246425140000032
Under the condition of not considering the leakage inductance peak, the voltage drop borne by the MOS tube is VP+Vf，VPThe turn-off voltage of the MOS tube can be determined by the turn-off ratio of the series battery pack. The turn ratio is therefore selected such that the maximum voltage stress of the switching tube is as low as possible. After the turn ratio is determined, the duty ratio also needs to be determined. To operate the equalizer in the current chopping mode, the dead time T must be setdAnd in order to ensure that the magnetic core is not saturated, the primary side and the secondary side of the flyback converter should meet the volt-second balance principle, namely:
Figure BDA0002246425140000041
wherein, VPThe sum turn ratio is known, and the dead time TdUsually 0.2T, secondary voltage V is selectedsEqual to the voltage of a single cell plus the conduction voltage drop of two diodes, so that T can be determined from equation (3)onAnd selecting a proper switching frequency f, namely determining the duty ratio D through the formula (4).
D＝Ton×f (4)
According to equation (5):
Figure BDA0002246425140000042
selecting proper primary side equalizing current IPThe primary side inductance L can be obtainedPThen, the secondary side inductance can be obtained according to the formula (6).
Figure BDA0002246425140000043
In conclusion, the rest parameters of the balancing topology can be obtained by setting the appropriate balancing current according to the actual requirement.
Preferably, the series battery pack equalization circuit is connected with a control circuit; the frequency of the control signal of the control circuit is determined according to the parameters of the controlled flyback converter, the switching loss of the MOS tube, the whole group and the voltage of the single battery.
Preferably, the duty ratio of the driving signal output by the control circuit enables the primary side and the secondary side of the flyback converter to reset in each signal period, that is, the current of the energy storage inductor first rises from zero and finally falls to zero.
Preferably, the single batteries of the series battery pack are secondary batteries; the secondary battery is one of a lead-acid battery, a lithium ion battery, a nickel-metal hydride battery and a super capacitor.
The invention achieves the following beneficial effects:
compared with the prior art, the active balancing topology is established based on a single flyback converter. The first characteristic of the equalization topology is that the whole equalization circuit only needs one flyback converter for energy transfer, so that the size of the equalization circuit can be greatly reduced; the second characteristic is that the expansion is easy, when the number of the battery pack single bodies is changed, only the number of the corresponding MOS tubes needs to be increased or decreased.
Drawings
In order to more clearly illustrate the principle and technical solutions of the present invention in implementation, the technical solutions related to the present invention will be further described below by using the accompanying drawings, and the following drawings are only some implementation examples of the present invention, and it is obvious for those skilled in the art that other technical solutions can be obtained according to the following drawings without creative efforts.
Fig. 1 is a schematic diagram of an equalizing circuit of embodiment 1 of the present invention;
fig. 2 is a schematic diagram of an equalizing main circuit of embodiment 2 of the present invention;
FIG. 3 is the operation principle of the first phase of the equalization process in embodiment 2 of the present invention;
FIG. 4 is the second stage operation principle of the equalizing process in embodiment 2 of the present invention;
fig. 5 shows the third stage operation principle of the equalization process in embodiment 2 of the present invention;
FIG. 6 shows the input condition current of the balanced topology simulation model in embodiment 2 of the present invention;
FIG. 7 is the balanced topology simulation model of example 2 built in MATLAB/Simulink;
fig. 8 is a result of SOC equalization simulation of the series battery pack in embodiment 2 of the present invention;
fig. 9 is a variation curve of the maximum difference in SOC of the series-connected battery packs in embodiment 2 of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and specific embodiments, which are illustrative and not limiting.
Example 1
As shown in fig. 1, a flyback converter based series battery pack equalization circuit, the series battery pack is composed of n single batteries; the equalizing circuit comprises 2n +1 MOS tubes, 2n diodes, a flyback converter and an RCD buffer circuit; the series battery pack is integrally connected with an MOS (metal oxide semiconductor) tube in series and is connected with the primary side of the flyback converter; the positive electrode and the negative electrode of each single battery are respectively connected with an MOS tube and connected with the secondary side of the flyback converter; the RCD buffer circuit is connected with the primary side of the flyback converter in parallel.
The balancing method of the series battery pack balancing circuit based on the flyback converter comprises the following steps:
each single battery in the series battery pack is marked as B in sequence1，B2，B3，…，Bn(ii) a Each MOS tube in the equalizing circuit is marked as S in turn0，S1，S2，…，S2n(ii) a The balance circuit aims to transfer the energy of the whole battery pack to the SOC (State of Charge) in the charging and discharging process, and the SOC of each single body tends to be consistent due to the lowest single body transfer.
The above object is achieved by the steps of:
when the single battery BiSOC ofWhen the voltage is low and meets the working condition of the equalizing circuit, the equalizing circuit starts to work;
the equalization process is divided into three phases: in the first stage, MOS tube S at primary side of flyback converter2nThe whole series battery pack is opened to store energy for the primary side inductor; second stage, MOS tube S of primary side of flyback converter2nWhen the flyback converter is closed, the RCD buffer circuit absorbs the leakage energy of the flyback converter, and the impact voltage of the flyback converter on the primary side is reduced; third stage, opening monomer BiCorresponding MOS transistor S2i-2And S2i-1The secondary side inductor has induced electromotive force of 'up positive and down negative', and the secondary side inductor can charge the monomer Bi, so that energy transfer is realized.
Example 2
As shown in fig. 2, the flyback converter based series battery pack equalization circuit is composed of a series battery pack consisting of 4 single batteries and an equalization circuit; the equalizing circuit comprises 9 MOS tubes, 8 diodes, a flyback converter and an RCD buffer circuit; the series battery pack is integrally connected with an MOS (metal oxide semiconductor) tube in series and is connected with the primary side of the flyback converter; the positive electrode and the negative electrode of each single battery are respectively connected with an MOS tube and connected with the secondary side of the flyback converter; the RCD buffer circuit is connected with the primary side of the flyback converter in parallel.
The balancing method of the series battery pack balancing circuit based on the flyback converter comprises the following steps:
each single battery in the series battery pack is marked as B in sequence1，B2，B3，B4(ii) a Each MOS tube in the equalizing circuit is marked as S in turn0，S1，S2，…，S8(ii) a The balance circuit aims to transfer the energy of the whole battery pack to the single body with the lowest SOC (State of Charge) in the charging and discharging process so that the SOCs of the single bodies tend to be consistent.
The above object is achieved by the steps of:
suppose a single cell B2And when the SOC is the lowest and meets the working condition of the equalizing circuit, the equalizing circuit starts to work.
The equalization process is divided into three phases:
as shown in FIG. 3, the firstIn one stage, MOS tube S of primary side of flyback converter8When the battery pack is opened, the whole series battery pack charges a primary side inductor, the current of the primary side inductor linearly rises, and the voltage is 'positive and negative up and down'.
As shown in fig. 4, in the second stage, the MOS transistor S on the primary side of the flyback converter8When the circuit is closed, the capacitor in the RCD buffer circuit absorbs the leakage inductance energy stored in the flyback converter, and the leakage inductance energy is consumed by the resistor, so that the voltage impact of the primary side MOS tube is reduced.
As shown in fig. 5, in the third stage, the MOS transistor S on the primary side of the flyback converter8When the current is turned off, the primary side inductor generates induced electromotive force of 'up negative and down positive' for preventing the current from dropping, and the induced electromotive force is coupled to the secondary side through a winding of the flyback converter; since the dotted terminal of the secondary side is opposite to the primary side, the induced electromotive force of the secondary side is "positive up and negative down". Now open B2Two corresponding MOS tubes S2、S3Since the secondary inductor has induced electromotive force of "up positive and down negative", the secondary inductor gives B2And charging, thereby realizing energy transfer.
FIG. 6 shows the input condition current of the balanced topology simulation model in embodiment 2 of the present invention. In the simulation process, load current is set by reducing a certain proportion according to the working condition of a standard UDDS (ultra dynamic dynamics measuring device) in a reference mode, the average value of current output in one period is 0.91A, the maximum value is 2.64A, the time lasts for 1367s, the total simulation time is 1 period, the current comprises the working conditions of acceleration, deceleration, charge and discharge and the like, and compared with the constant-current charge and discharge, the effectiveness of the actual work of the balanced topology can be better verified.
FIG. 7 is the balanced topology simulation model of example 2 built in MATLAB/Simulink. The parameter setting was performed according to a 18650 type ternary lithium battery having a capacity of 3.2Ah, manufactured by sanyo corporation of japan. The simulation model specific parameter settings are shown in table 1.
TABLE 1 simulation parameters
Figure BDA0002246425140000081
Fig. 8 is a result of SOC equalization simulation of the series battery pack in embodiment 2 of the present invention, and fig. 9 is a maximum difference variation curve of the SOC of the series battery pack in embodiment 2 of the present invention. As can be seen from fig. 8 and 9, at the start time, the SOC difference of each battery cell is large, the operating condition of the balancing circuit is satisfied, the balancing circuit starts to operate, and the difference of the SOC of each battery cell gradually decreases as the operating time of the balancing circuit continues. And at the time of 1189s, the maximum difference value of the SOC of each monomer tends to 1%, the requirement of the balance precision is met, and the maximum difference value is kept at 1%.

Claims (5)

1. Series battery group equalizer circuit based on flyback converter, its characterized in that:
the series battery pack consists of n single batteries; the equalizing circuit comprises 2n +1 MOS tubes, 2n diodes, a flyback converter and an RCD buffer circuit; the series battery pack is integrally connected with an MOS (metal oxide semiconductor) tube in series and is connected with the primary side of the flyback converter; the positive electrode and the negative electrode of each single battery are respectively connected with an MOS tube and connected with the secondary side of the flyback converter; the RCD buffer circuit is connected with the primary side of the flyback converter in parallel.
2. The method for balancing a series battery pack balancing circuit based on a flyback converter as claimed in claim 1, wherein:
each single battery in the series battery pack is marked as B in sequence1，B2，B3，…，Bn(ii) a Each MOS tube in the equalizing circuit is marked as S in turn0，S1，S2，…，S2n(ii) a The balancing circuit aims at transferring the energy of the whole battery pack to the monomer with the lowest SOC in the charging and discharging process so that the SOC of each monomer of the whole battery pack tends to be consistent;
the above object is achieved by the steps of:
when the single battery BiWhen the SOC is lowest and meets the working condition of the equalizing circuit, the equalizing circuit starts to work;
the equalization process is divided into three phases: in the first stage, MOS tube S at primary side of flyback converter2nThe whole series battery pack is opened to store energy for the primary side inductor; second stage, M of primary side of flyback converterOS tube S2nWhen the flyback converter is closed, the RCD buffer circuit absorbs the leakage energy of the flyback converter, and the impact voltage of the flyback converter on the primary side is reduced; third stage, opening monomer BiCorresponding MOS transistor S2i-2And S2i-1The secondary side inductor has induced electromotive force of 'up positive and down negative', and the secondary side inductor charges the monomer Bi to realize energy transfer.
3. The balancing method of the series battery pack balancing circuit based on the flyback converter as claimed in claim 2, wherein:
the series battery pack equalization circuit is connected with a control circuit; the frequency of the control signal of the control circuit is determined according to the parameters of the controlled flyback converter, the switching loss of the MOS tube, the whole group and the voltage of the single battery.
4. The balancing method of the series battery pack balancing circuit based on the flyback converter as claimed in claim 3, wherein: the duty ratio of the driving signal output by the control circuit enables the primary side and the secondary side of the flyback converter to reset in each signal period, namely, the current of the primary side inductor and the secondary side inductor of the flyback converter starts to rise from zero and finally falls to zero.
5. The balancing method of the series battery pack balancing circuit based on the flyback converter as claimed in any one of claims 2 to 4, wherein: the single battery of the series battery pack is a secondary battery; the secondary battery is one of a lead-acid battery, a lithium ion battery, a nickel-metal hydride battery and a super capacitor.
CN201911018431.XA 2019-10-24 2019-10-24 Series battery pack equalization circuit and equalization method based on flyback converter Pending CN110729789A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011095606A3 (en) * 2010-02-05 2012-03-22 Commissariat à l'énergie atomique et aux énergies alternatives Equalization system for accumulator batteries
CN105789715A (en) * 2016-02-25 2016-07-20 上海大学 Battery sampling and equalization circuits sharing switch array
CN107658935A (en) * 2017-10-20 2018-02-02 广州金升阳科技有限公司 A kind of battery detection and equalizing system and its control method
CN107658936A (en) * 2017-10-20 2018-02-02 广州金升阳科技有限公司 A kind of battery detection and equalizing system and its control method
CN107769389A (en) * 2017-10-24 2018-03-06 华南理工大学 A kind of battery energy storage system for isolating symmetrical expression series connection circuit of reversed excitation
CN108923508A (en) * 2018-10-10 2018-11-30 北京动力京工科技有限公司 A kind of active equalization of battery device containing flyback converter
CN110239396A (en) * 2019-06-26 2019-09-17 山东大学 Battery pack balancing module, system and control method based on two-way flyback converter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011095606A3 (en) * 2010-02-05 2012-03-22 Commissariat à l'énergie atomique et aux énergies alternatives Equalization system for accumulator batteries
CN105789715A (en) * 2016-02-25 2016-07-20 上海大学 Battery sampling and equalization circuits sharing switch array
CN107658935A (en) * 2017-10-20 2018-02-02 广州金升阳科技有限公司 A kind of battery detection and equalizing system and its control method
CN107658936A (en) * 2017-10-20 2018-02-02 广州金升阳科技有限公司 A kind of battery detection and equalizing system and its control method
CN107769389A (en) * 2017-10-24 2018-03-06 华南理工大学 A kind of battery energy storage system for isolating symmetrical expression series connection circuit of reversed excitation
CN108923508A (en) * 2018-10-10 2018-11-30 北京动力京工科技有限公司 A kind of active equalization of battery device containing flyback converter
CN110239396A (en) * 2019-06-26 2019-09-17 山东大学 Battery pack balancing module, system and control method based on two-way flyback converter

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Application publication date: 20200124