CN113162159B - Improved Cell-to-Cell battery equalization circuit based on LC resonance circuit and implementation method - Google Patents
Improved Cell-to-Cell battery equalization circuit based on LC resonance circuit and implementation method Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 4
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an improved Cell-to-Cell battery equalization circuit based on an LC (inductance-capacitance) resonance circuit and an implementation method. The invention utilizes the LC resonance module to realize the energy transmission between the adjacent batteries and the energy transmission between the first and the last battery monomers of the series battery pack, thereby realizing the balance of the series battery pack and improving the available capacity of the battery pack. The invention has the following advantages: zero current switching is realized by utilizing the LC resonance module, and the switching loss is effectively reduced; the switching frequency is effectively improved, the equalizing speed is high, and the circuit volume is reduced; the control mode is simple, and two groups of switch modules can be controlled only by two groups of complementary PWM pulse signals with fixed frequency and fixed duty ratio.
Description
Technical Field
The invention relates to the technical field of series lithium ion battery pack equalization, in particular to a Cell-to-Cell battery equalization circuit improved based on an LC resonance circuit and an implementation method.
Background
Lithium batteries are widely used in many energy storage fields due to their high energy density, low self-discharge rate, and other characteristics. However, the voltage of the common single lithium battery is low, and a large number of lithium batteries are required to be combined in series and parallel to meet different application occasions. In the production and manufacturing process, the lithium battery can not keep the consistency of parameters such as internal resistance, capacity and the like, so that in the application of cyclic charge and discharge of the lithium battery pack, the voltage of a single battery is inconsistent and becomes more severe along with the increase of charge and discharge times, certain battery units are over-charged or over-discharged, and the service life and the reliability of the battery are influenced. Therefore, the method has great practical significance for the research of the lithium battery pack voltage equalization method.
The chinese invention patent (application number CN201610068511.6) of prior art 1 discloses an Adjacent Cell-to-Cell equalization circuit and a control method based on three-resonance state LC conversion, which realizes soft switching by using a three-resonance state LC conversion module to realize energy equalization between Adjacent cells, but only realizes energy equalization between connected cells, and the first and last cells are not linked, so the equalization speed is slow;
chinese patent application No. CN201410698450.2 of prior art 2 discloses an Adjacent-Cell-to-Cell equalization circuit based on LCL resonant transformation and an implementation method thereof, although soft switching is also implemented in the energy conversion process, energy can only be transferred between Adjacent cells, so the equalization speed is still slow.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an improved Cell-to-Cell battery equalization circuit based on an LC resonance circuit and an implementation method thereof. According to the invention, adjacent battery monomers share one LC resonance module, and the first battery monomer and the last battery monomer share one LC resonance module, the microcontroller transmits two groups of PWM pulse signals with complementary, fixed frequency and fixed duty ratio to the switch selection module to control the switch selection module to work in a mode A or a mode B, so that energy is transmitted between the adjacent battery monomers and between the first battery monomer and the last battery monomer, and the LC resonance module realizes zero current turn-off, reduces the switching loss and improves the balancing rate.
The first purpose of the invention can be achieved by adopting the following technical scheme:
a Cell-to-Cell battery equalization circuit based on LC resonant circuit improvement, the battery equalization circuit comprising: the system comprises a series battery pack, two groups of switch selection modules, n LC resonance modules, a switch driving circuit and a microcontroller;
the series battery pack is formed by connecting n battery monomers in series and is named as B in sequence 1 、B 2 、…B i 、…B n ，i＝1、2、…、n；
The two groups of switch selection modules are respectively an A group of switch selection module and a B group of switch selection module, the A group of switch selection module is composed of n gating switches, and the A group of switch selection modules are respectively SA 1 、SA 2 、…SA i 、…、SA n ，SA i Both ends of the battery are respectively connected with the battery monomer B in the series battery pack i The positive electrode and the negative electrode are connected; the B group switch selection module consists of 4 gating switches which are respectively SB 1 、SB 2 、SB 3 、SB 4 Wherein SB 2 One end of (B), SB 1 Respectively with a battery cell B n Are connected with the positive and negative poles of SB 4 One end of (B), SB 3 Respectively with a battery cell B 1 The positive electrode and the negative electrode are connected;
wherein, SA 1 、SA 2 、…SA i 、…、SA n The device is composed of two N-channel MOSFETs which are connected in series in the positive direction; SB (service bus) 1 、SB 2 、SB 3 、SB 4 The device is composed of two N-channel MOSFETs which are connected in series in an inverted mode;
the number of the LC resonance modules is n, and the LC resonance modules are named as (LC) 1 、(LC) 2 、…(LC) i 、…、(LC) n Each LC resonance module consists of an inductor L and a capacitor C which are respectively named as L 1 、L 2 、…L i 、…、L n And C 1 、C 2 、…C i 、…、C n ；
LC resonance module (LC) 1 、(LC) 2 、…(LC) p 、…、(LC) n-1 Middle (LC) p And SA in the group A switch selection module i＝p Midpoint and SA of i＝p+1 The middle points are connected, and p is 1, 2, … or n-1; LC resonance module (LC) n Is simultaneously with SB 4 Another end of (B), SB 2 Are connected to the other end of the battery cell and then connected to the battery cells B, respectively 1 、B n Positive electrode of (2), LC resonance module (LC) n Is simultaneously with SB 3 The other end of (B), SB 1 Are connected to the other end of the battery cell and then connected to the battery cell B respectively 1 、B n The negative electrode of (1);
the microcontroller outputs two groups of complementary PWM pulse signals with fixed frequency and fixed duty ratio, and the signals are amplified by the switch driving circuit to control the on-off of the switch selection module of the group A and the switch selection module of the group B.
Further, SA in the A group switch selection module i Both ends of the battery pack are respectively connected with each battery monomer B of the series battery pack i The positive electrode and the negative electrode are connected; the B group switch selection module consists of 4 gating switches which are respectively SB 1 、SB 2 、SB 3 、SB 4 Wherein SB 2 、SB 1 Respectively with a battery cell B n Positive and negative poles of SB are connected 4 、SB 3 Respectively with a battery cell B 1 The anode and the cathode are connected.
Further, in the LC resonance module (LC) p And SA in the group A switch selection module i＝p Midpoint and SA of i＝p+1 The middle points are connected; the LC resonance module (LC) n Is simultaneously with SB 4 、SB 2 Connected and then respectively connected to the battery cells B 1 、B n Positive electrode of (2), LC resonance module (LC) n Is simultaneously with SB 3 、SB 1 Connected and then respectively connected to the battery cells B 1 、B n The negative electrode of (1).
Furthermore, the microcontroller generates two groups of complementary PWM pulse signals with fixed frequency and fixed duty ratio without considering the distribution condition of the initial voltage, amplifies the signals through the switch driving circuit and controls the switch selection module A and the switch selection module B;
each switching period is divided into two modes, and when in the mode A, SA of the switch selection module in the group A 1 、SA 2 、…SA i 、…、SA n The MOSFET on the middle side is conducted, and the SB of the B group switch selection module 1 And SB 2 In which two reverse series MOSFET are both turned on, LC resonance module (LC) i And battery cell B i Connecting in parallel; when in mode B, the SA of the group A switch selection module 1 、SA 2 、…SA i 、…、SA n The other one ofMOSFET on the side, SB of B group switch selection module 3 And SB 4 In which two reverse series MOSFET are both turned on, LC resonance module (LC) n And battery cell B 1 Parallel, LC resonance module (LC) p And battery cell B i＝p+1 Are connected in parallel.
Further, when the frequency of the switching signals of the group A switch selection module and the group B switch selection module is equal to the integral multiple of the resonance frequency of the LC series resonance circuit, zero current switching is realized.
The invention only adds 1 LC resonance module and 4 gating switches on the basis of the original Cell-to-Cell battery equalizing circuit based on the LC resonance circuit, thereby not only realizing the energy transmission between adjacent batteries, but also realizing the energy transmission between the first and last battery monomers in the series battery pack, realizing zero current switching by utilizing the resonance of the LC resonance module on the basis, reducing the switching loss, and comprehensively considering the circuit volume while improving the equalizing speed compared with the prior equalizing technology.
The other purpose of the invention can be achieved by adopting the following technical scheme:
an implementation method of a Cell-to-Cell battery equalization circuit improved based on an LC resonance circuit, the implementation method comprises the following steps:
s1, the voltage sampling circuit collects the voltage of all the single batteries in the series battery pack and transmits the collected voltage information to the microcontroller;
s2, the microcontroller processes the acquired voltage information to obtain the maximum battery voltage and the minimum battery voltage of the series battery pack, judges whether the voltage between the maximum battery voltage and the minimum battery voltage is greater than the corresponding equalization threshold voltage, and starts an equalization circuit if the voltage between the maximum battery voltage and the minimum battery voltage is greater than the equalization threshold voltage;
s3, the microcontroller generates two sets of complementary PWM pulse signals with fixed frequency and fixed duty ratio to control the two sets of switch modules, so that energy flows between adjacent single batteries and between the first single battery and the last single battery;
s4, the frequency of the PWM pulse signal generated by the microcontroller is integral multiple of the resonance frequency of the LC resonance circuit, thereby realizing zero current switching.
Compared with the prior art, the invention has the following advantages and effects:
(1) according to the invention, energy flows between the adjacent battery monomers and the first and last battery monomers, and the balancing speed is increased while the circuit volume is considered;
(2) the energy transfer of the traditional circuit by using capacitance or inductance is changed, the zero-current switch is realized by using the resonance of the LC resonance module, the switching loss is greatly reduced, the switching frequency is favorably improved, and the circuit volume is reduced;
(3) the microcontroller in the Cell-to-Cell battery equalization circuit based on the LC resonance circuit improvement disclosed by the invention does not need to consider the distribution condition of initial voltage, and can realize the equalization of the series battery pack only by generating two groups of PWM pulse signals with complementary, fixed frequency and fixed duty ratio, amplifying the signals through the switch driving circuit and controlling the group A switch selection module and the group B switch selection module.
Drawings
FIG. 1 is a schematic diagram of a Cell-to-Cell equalization circuit based on LC resonant circuit improvement in the present invention;
fig. 2 is a diagram of a Cell-to-Cell battery equalization circuit based on LC resonant circuit improvement for 4 series cells;
fig. 3 is a conduction diagram corresponding to two modes of a Cell-to-Cell battery equalization circuit based on LC resonant circuit improvement and suitable for 4 series-connected cells, wherein fig. 3(a) is a circuit conduction diagram corresponding to mode a, and fig. 3(B) is a circuit conduction diagram corresponding to mode B;
FIG. 4 shows capacitance C of Cell-to-Cell equalization circuit based on LC resonant circuit improvement 1 Current of (I) C1 Sum voltage U C1 A waveform diagram of (a);
FIG. 5 shows the distribution of single cell voltage V B1 >V B2 >V B3 >V B4 The invention provides a Cell voltage trace diagram obtained by simulating a Cell-to-Cell equalization circuit improved based on an LC resonance circuit in PSIM9.0 simulation software.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Examples
Fig. 1 is a Cell-to-Cell battery equalization circuit based on LC resonant circuit improvement in the present embodiment, wherein fig. 2 is a Cell-to-Cell battery equalization circuit based on LC resonant circuit improvement and suitable for 4 series cells, and includes: the system comprises a series battery pack with 4 series battery monomers, two groups of switch selection modules, n LC resonance modules, a switch driving circuit and a microcontroller.
The two groups of switch selection modules are respectively an A group of switch selection module and a B group of switch selection module, and SA in the A group of switch selection module 1 、SA 2 、SA 3 、SA 4 Both ends of the battery pack are respectively connected with each battery monomer B of the series battery pack 1 、B 2 、B 3 、B 4 The positive and negative poles of the switch selection module B are connected, and the SB in the switch selection module B is connected 2 、SB 1 Respectively with a battery cell B 4 Is connected to the negative electrode of SB 4 、SB 3 Respectively with a battery cell B 1 The positive electrode and the negative electrode are connected.
LC resonance module (LC) 1 Respectively with SA in the group A switch selection module 1 Midpoint and SA of 2 Mid-point connected, LC resonance module (LC) 2 Respectively with SA in the group A switch selection module 2 Midpoint and SA of 3 Mid-point connected, LC resonance module (LC) 3 Respectively with SA in the group A switch selection module 3 Midpoint and SA of 4 The middle points are connected; LC resonance module (LC) 4 Is simultaneously with SB 4 、SB 2 Connected and then respectively connected to the battery cells B 1 、B 4 Positive electrode of (2), LC resonance module (LC) 4 Is simultaneously with SB 3 、SB 1 Connected and then respectively connected to the battery cells B 1 、B 4 The negative electrode of (1).
The microcontroller outputs two groups of complementary PWM pulse signals with fixed frequency and fixed duty ratio, and the signals are amplified by the switch driving circuit to control the on-off of the switch selection module of the group A and the switch selection module of the group B.
Each switching period is divided into two modes, fig. 3(a) is a circuit conducting diagram corresponding to the mode a, and when in the mode a, the SA of the group a switch selection module 1 、SA 2 、SA 3 、SA 4 The MOSFET on the middle side is conducted, and the B group of switch selection modules SB 1 And SB 2 In which two reverse series MOSFET are both turned on, LC resonance module (LC) 1 And battery cell B 1 Parallel, LC resonance module (LC) 2 And battery cell B 2 Parallel, LC resonance module (LC) 3 And battery cell B 3 Parallel, LC resonance module (LC) 4 And battery cell B 4 Parallel connection; FIG. 3(B) is a circuit conducting diagram corresponding to the mode B, when in the mode B, SA of the group A switch selection module 1 、SA 2 、SA 3 、SA 4 The MOSFET on the other side is conducted, and the B group of switch selection modules SB 3 And SB 4 In which two reverse series MOSFET are both turned on, LC resonance module (LC) 4 And battery cell B 1 Parallel, LC resonance module (LC) 1 And battery cell B 2 Parallel, LC resonance module (LC) 2 And battery cell B 3 Parallel, LC resonance module (LC) 3 And battery cell B 4 Are connected in parallel. Suppose that the cell voltage distribution when the battery packs are connected in series is V B1 >V B2 >V B3 >V B4 When the voltage sampling circuit sends the maximum voltage of the single battery and the minimum voltage of the single battery to the microcontroller, the microcontroller judges whether the difference value between the maximum voltage and the minimum voltage is larger than the balance threshold value or not, the microcontroller enters a balance state, and the microcontroller controls and generates two groups of PWM pulse signals with complementary fixed frequency and fixed duty ratio to control the switch selection module A and the switch selection module B to select the switchesThe on-off of the switch of the module is switched between the mode A and the mode B, so that the balance between the series-connected battery packs is realized, meanwhile, the switching frequency is set to be integral multiple of the LC resonance frequency, so that the zero-current switching is realized, and a capacitor C is arranged in the balancing process in the process shown in figure 4 1 Current of (I) C1 Sum voltage U C1 The waveform diagram of the Cell-to-Cell battery equalization circuit is the same as other LC resonance modules, and the diagram shows that when the switch is switched, the current of the LC resonance circuit is zero, so that zero-current switching is realized, the diagram shown in FIG. 5 is a battery voltage track diagram obtained when the Cell-to-Cell battery equalization circuit improved based on the LC resonance circuit is simulated in PSIM9.0 simulation software, and the simulation result verifies the effectiveness, rapidity and high efficiency of the Cell-to-Cell battery equalization circuit.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
1. A Cell-to-Cell battery equalization circuit based on LC resonant circuit improvement, the battery equalization circuit comprising: the system comprises a series battery pack, two groups of switch selection modules, n LC resonance modules, a switch driving circuit and a microcontroller;
the series battery pack is formed by connecting n battery monomers in series and is named as B in sequence 1 、B 2 、…B i 、…B n ，i＝1、2、…、n；
The two groups of switch selection modules are respectively an A group of switch selection module and a B group of switch selection module, the A group of switch selection module consists of n gating switches, and the N gating switches are respectively SA 1 、SA 2 、…SA i 、…、SA n ，SA i Both ends of the battery are respectively connected with the battery monomer B in the series battery pack i The positive electrode and the negative electrode are connected; the B group switch selection module consists of 4 gating switches which are respectively SB 1 、SB 2 、SB 3 、SB 4 Wherein SB 2 One end of (A),SB 1 Respectively with a battery cell B n Positive and negative poles of SB are connected 4 One end of (B), SB 3 Respectively with a battery cell B 1 The anode and the cathode are connected;
wherein, SA 1 、SA 2 、…SA i 、…、SA n The two forward-connected N-channel MOSFETs are respectively formed; SB (service bus) 1 、SB 2 、SB 3 、SB 4 The two N-channel MOSFETs are reversely connected in series;
the number of the LC resonance modules is n, and the LC resonance modules are named as (LC) 1 、(LC) 2 、…(LC) i 、…、(LC) n Each LC resonance module consists of an inductor L and a capacitor C which are respectively named as L 1 、L 2 、…L i 、…、L n And C 1 、C 2 、…C i 、…、C n ；
LC resonance module (LC) 1 、(LC) 2 、…(LC) p 、…、(LC) n-1 Middle (LC) p And SA in the group A switch selection module i＝p Midpoint and SA of i＝p+1 The middle points are connected, and p is 1, 2, … or n-1; LC resonance module (LC) n Is simultaneously with SB 4 The other end of (B), SB 2 Are connected to the other end of the battery cell and then connected to the battery cell B respectively 1 、B n Positive electrode of (2), LC resonance module (LC) n Is simultaneously with SB 3 Another end of (B), SB 1 Are connected to the other end of the battery cell and then connected to the battery cell B respectively 1 、B n The negative electrode of (1);
the microcontroller outputs two sets of PWM pulse signals with complementary, fixed frequency and fixed duty ratio, and the signals are amplified by the switch driving circuit to control the on-off of the A group of switch selection modules and the B group of switch selection modules.
2. The improved Cell-to-Cell battery equalization circuit based on LC resonant circuits as claimed in claim 1, wherein said microcontroller generates two sets of complementary, fixed frequency, fixed duty cycle PWM pulse signals without considering the distribution of initial voltage, amplifies the signals by the switch driving circuit, and controls the group a switch selection module and the group B switch selection module;
each switching period is divided into two modes, and when in the mode A, the SA of the switch selection module in the group A 1 、SA 2 、…SA i 、…、SA n The MOSFET on the middle side is conducted, and the SB of the B group switch selection module 1 And SB 2 In which two reverse series MOSFET are both turned on, LC resonance module (LC) i And battery cell B i Connecting in parallel; when in the mode B, the SA of the group A switch selection module 1 、SA 2 、…SA i 、…、SA n The MOSFET on the middle side and the MOSFET on the other side are conducted, and the SB of the switch selection module is arranged in the group B 3 And SB 4 In which two reverse series MOSFET are both turned on, LC resonance module (LC) n And battery cell B 1 Parallel, LC resonance module (LC) p And battery cell B i＝p+1 And (4) connecting in parallel.
3. The improved Cell-to-Cell battery equalization circuit based on LC resonant circuit as claimed in claim 2, characterized in that zero current switching is implemented when the frequency of the switching signal of group a switch selection module and group B switch selection module is equal to integer multiple of the resonant frequency of the LC series resonant circuit.
4. A method for implementing a Cell-to-Cell equalization circuit based on improvement of an LC resonant circuit according to any one of claims 1 to 3, the method comprising the following steps:
s1, the voltage sampling circuit collects the voltages of all the single batteries in the series battery pack and transmits the collected voltage information to the microcontroller;
s2, the microcontroller processes the acquired voltage information to obtain the maximum battery voltage and the minimum battery voltage of the series battery pack, judges whether the voltage between the maximum battery voltage and the minimum battery voltage is greater than the corresponding equalization threshold voltage, and starts the equalization circuit if the voltage between the maximum battery voltage and the minimum battery voltage is greater than the equalization threshold voltage;
s3, the microcontroller generates two groups of complementary PWM pulse signals with fixed frequency and fixed duty ratio to control the two groups of switch modules, and energy flows between adjacent battery monomers and the first and last battery monomers;
and S4, the frequency of the PWM pulse signal generated by the microcontroller is integral multiple of the resonance frequency of the LC resonance circuit, so that zero-current switching is realized.
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