CN106532851B - Equalizing circuit capable of expanding 3n energy storage units - Google Patents

Equalizing circuit capable of expanding 3n energy storage units Download PDF

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CN106532851B
CN106532851B CN201611168969.5A CN201611168969A CN106532851B CN 106532851 B CN106532851 B CN 106532851B CN 201611168969 A CN201611168969 A CN 201611168969A CN 106532851 B CN106532851 B CN 106532851B
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battery
energy storage
equalization
inductor
circuit
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CN106532851A (en
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康龙云
王书彪
卢楚生
令狐金卿
王则沣
冯元彬
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South China University of Technology SCUT
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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
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • 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
    • 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)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses an equalizing circuit capable of expanding 3n energy storage units, which is easy to expand the number of series energy storage units, can expand 3 battery cells each time, and only needs to increase one expansion sub-circuit without changing the original main circuit structure. The equalizing circuit uses less switching devices and energy storage elements, and 3n energy storage units adopt 5n-2 switching devices and 3n-1 energy storage inductors. The equalization circuit can realize dynamic active equalization on the series energy storage units in the charging, discharging and standing states, improves the unbalanced phenomenon of the series battery pack, improves the available capacity of the battery pack, reduces the maintenance and replacement period of the series battery pack, and prolongs the service life of the battery pack. The equalization circuit is suitable for a battery management system of an energy storage device in an electric automobile or an energy storage power station.

Description

Equalizing circuit capable of expanding 3n energy storage units
Technical Field
The invention relates to the technical field of battery pack equalization, in particular to an equalization circuit capable of expanding 3n energy storage units.
Background
In recent years, with the increasing deterioration of air quality and the increasing lack of petroleum resources, new energy automobiles, especially pure electric automobiles, are becoming development hotspots for various large automobile companies in the world today. The power battery pack is used as a key component of the electric automobile, and has great influence on the power performance, economy and safety of the whole automobile. After the power battery pack is subjected to a plurality of charge and discharge cycles, the distribution of the residual capacity of each battery cell is approximately different, and the phenomenon of overcharge and overdischarge can be easily caused if the balance is not carried out. In this way, in practical use, the service life of the battery pack will be seriously affected, and even there is a safety hidden danger of overheat and fire.
In order to solve the problem of inconsistency of the battery pack and to improve the overall performance of the battery pack, it is necessary to employ equalization control. The current lithium ion battery pack balance control method can be divided into two main types, namely energy dissipation type and energy non-dissipation type according to the energy consumption condition of a circuit in the balance process; the dissipation type is that shunt resistors are connected in parallel outside each single battery, the energy of the battery module with higher residual capacity is consumed through the resistors by controlling corresponding switching devices, the energy is wasted by the method, a large amount of heat is generated in the balancing process, and the load of battery thermal management is increased. The non-dissipative energy transfer is achieved by a DC-DC circuit external to the battery. According to the equalization function classification, charge equalization, discharge equalization and dynamic equalization can be classified. The charge equalization refers to equalization in the charging process, and is generally started when the cell voltage of the battery pack reaches a set value, and overcharge is prevented by reducing the charging current; discharge equalization refers to equalization in the discharge process, and over-discharge is prevented by supplementing energy to a battery cell with low residual energy; the dynamic equalization mode combines the advantages of charge equalization and discharge equalization, and means equalization of the battery pack in the whole charge and discharge process.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an equalizing circuit capable of expanding 3n energy storage units.
The aim of the invention can be achieved by adopting the following technical scheme:
an equalization circuit capable of expanding 3n energy storage units, the equalization circuit comprises 3n series energy storage batteries and n equalization sub-circuits, wherein the 3n series energy storage batteries are respectively connected in series in sequence with each of B1a, B1B, B1c, B2a, B2B, B2c, … …, bja, bjb, bjc, … … and Bna, bnb, bnc, and each three batteries Bja, bjb, bjc is a battery group m j (j=1, 2,3 … n), n groups of battery cells, where n is a positive integer, said n equalization sub-circuits comprising a basic equalization sub-circuit Q1 and n-1 extension equalization sub-circuits Qi (i=2, 3, …, n);
the basic equalization subcircuit Q1 consists of inductors L1a and L1b and switching tubes S1a, S1b and S1c and is used for taking charge of a battery pack m 1 The balance among the batteries B1a, B1B and B1c is realized, and the switch tubes S1a, S1B and S1c are N-channel MOSFETs and respectively comprise a source electrode, a drain electrode and a grid electrode;
in the basic equalization subcircuit Q1, one end of an inductor L1a is connected with the cathode of a battery B1a, and the other end of the inductor L1a is connected with the source electrode of a switching tube S1a and the drain electrode of a switching tube S1B; one end of the inductor L1B is connected with the cathode of the battery B1B, and the other end of the inductor L1B is connected with the source electrode of the switch tube S1B and the drain electrode of the switch tube S1 c; the drain electrode of the switch tube S1a is connected with the positive electrode of the battery B1a, and the source electrode of the switch tube S1c is connected with the negative electrode of the battery B1 c;
the extended equalization subcircuit Qi (i=2, 3, …, n) consists of an inductor Lia, lib, lic and a switch tube Sia, sib, sic, sid, sie, wherein one end of the inductor Lia is connected with the cathode of the battery Bia, the other end of the inductor Lia is connected with the source of the switch tube Sia and the drain of the switch tube Sib, one end of the inductor Lib is connected with the cathode of the battery Bia, the other end of the inductor Lib is connected with the source of the switch tube Sia and the drain of the switch tube Sic, the drain of the switch tube Sia is connected with the anode of the battery Bia, the source of the switch tube Sic is connected with the cathode of the battery Bic, and the switch tube Sid, the switch tube Sie and the inductor Lic are responsible for the battery pack m i And battery group m i-1 One end of the inductor Lic is connected with the positive electrode of the battery Bia, the other end of the inductor Lic is connected with the source electrode of the switching tube Sid and the drain electrode of the switching tube Sie, the drain electrode of the switching tube Sid is connected with the positive electrode of the battery Bi-1a, and the source electrode of the switching tube Sie is connected with the negative electrode of the battery Bic.
Further, the gates of the switching tubes S1a, S1b, S1c, sia, sib, sic, sid, sie (i=2, 3, …, n) are all connected with a control circuit, and the driving signals output by the control circuit control the switching tubes to be turned on and off, so that energy transfer is realized, and the purpose of balancing the battery pack is achieved.
Further, the 3n series energy storage batteries are easy to expand the battery group m i I.e. three batteries Bia, bib, bic, while the equalization circuit adds an extended equalization subcircuit Qi.
Further, the inductors in the equalization circuit are energy storage inductors, the energy storage inductance value is determined by the switching frequency of the switching tube, the voltage of the battery cell and/or the equalization time selection of the equalization circuit, and the inductance values of different energy storage inductors can meet the requirements of different equalization times.
Further, the frequency of the driving signal output by the control circuit is determined according to the switching loss of the switching tube, the inductance value of the energy storage inductor, and the voltage and capacity of the battery cell.
Further, the duty ratio of the driving signal output by the control circuit is selectively determined according to the working condition of the equalization sub-circuit, so that each inductor is ensured to be reset in each switching period, namely the current of the energy storage inductor in each switching period finally drops to zero, and the inductor is enabled to work in an intermittent mode.
Further, the 3n energy storage units are secondary batteries, including lithium ion batteries, lead acid batteries, supercapacitors, or nickel-hydrogen batteries.
Compared with the prior art, the invention has the following advantages and effects:
1) The invention adopts an equalization circuit in the battery management system of the series battery pack to ensure that the single body in the battery pack is not overcharged or overdischarged in the charging and discharging processes, improves the unbalanced phenomenon of the series battery pack, improves the available capacity of the battery pack, reduces the maintenance of the series battery pack, prolongs the service life of the battery pack, and reduces the running cost of the hybrid electric vehicle, the electric vehicle and the energy storage power station.
2) The invention is easy to expand the number of the batteries of the series battery packs, when the number of the batteries needs to be expanded, one small battery pack can be added at a time, only one expansion equalization sub-circuit needs to be added to be connected with the original circuit, and the original circuit structure and the control strategy do not need to be changed.
3) In the process of charging and discharging, the equalization sub-circuit firstly equalizes the batteries in the battery groups and then equalizes the adjacent battery groups, and finally equalizes the batteries in the whole group.
Drawings
FIG. 1 is a schematic circuit diagram of an equalization circuit of the scalable 3n energy storage units disclosed in the present invention;
FIG. 2 is a schematic circuit diagram of a basic equalizer sub-circuit in accordance with the present invention;
FIG. 3 is a schematic circuit diagram of an extended equalization sub-circuit in accordance with the present invention;
fig. 4 (a) is a battery discharge pattern 1 in a battery pack;
fig. 4 (b) is an inductive freewheel mode 1 within the battery pack.
Fig. 4 (c) is a battery discharge pattern 2 within the battery pack;
fig. 4 (d) is an inductive freewheel mode 2 within the battery pack;
fig. 5 (a) is an adjacent battery pack equalization process step 1;
fig. 5 (b) is an adjacent battery pack equalization process step 2;
fig. 6 (a) is an equalization topology 1 of 9 batteries;
fig. 6 (b) is an equalization topology 2 of 9 batteries.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
The embodiment describes an equalization circuit capable of expanding 3n energy storage units in detail with reference to fig. 1 to 6.
FIG. 1 is a schematic circuit diagram of an equalization circuit with 3n energy storage units scalable as shown in FIG. 1, the equalization circuit comprises 3n series-connected energy storage batteries and n equalization sub-circuits, wherein the 3n series-connected energy storage batteries are respectively B1a, B1B, B1c, B2a, B2B, B2c, … …, bja, bjb, bjc, … …, bna, bnb, bnc, and each three batteries Bja, bjb, bjc is a battery group m j (j=1, 2,3 … n), where n is a positive integer, the n equalization sub-circuits comprising one basic equalization sub-circuit Q1, n-1 extended equalization sub-circuits Qi (i=2, 3, …, n).
Fig. 2 is a circuit diagram of a basic equalization sub-circuit, saidThe basic equalization subcircuit consists of inductors L1a and L1b and switching tubes S1a, S1b and S1c and is responsible for a small battery group m 1 The balance among the batteries B1a, B1B, B1c. The switching tubes S1a, S1b and S1c are N-channel MOSFETs and comprise a source electrode, a drain electrode and a grid electrode.
In the basic equalization subcircuit, one end of an inductor L1a is connected with the cathode of a battery B1a, and the other end of the inductor L1a is connected with the source electrode of a switching tube S1a and the drain electrode of a switching tube S1B. One end of the inductor L1B is connected to the negative electrode of the battery B1B, and the other end is connected to the source electrode of the switching tube S1B and the drain electrode of the switching tube S1c. The drain electrode of the switch tube S1a is connected with the positive electrode of the battery B1a, and the source electrode of the switch tube S1c is connected with the negative electrode of the battery B1c to form a complete loop.
Fig. 3 is a circuit diagram of an extended equalization sub-circuit Qi, i=2, 3, …, n, consisting of an inductance Lia, lib, lic and a switching tube Sia, sib, sic, sid, sie. One end of the inductor Lia is connected with the cathode of the battery Bia, and the other end of the inductor Lia is connected with the source electrode of the switch tube Sia and the drain electrode of the switch tube Sib. One end of the inductor Lib is connected with the cathode of the battery Bib, and the other end of the inductor Lib is connected with the source electrode of the switch tube Sib and the drain electrode of the switch tube Sic. The drain electrode of the switch tube Sia is connected with the positive electrode of the battery Bia, and the source electrode of the switch tube Sic is connected with the negative electrode of the battery Bic. The switch tube Sid, the switch tube Sie and the inductor Lic are responsible for the battery group m i And battery group m i-1 Are connected. One end of the inductor Lic is connected with the positive electrode of the battery Bia, the other end of the inductor Lic is connected with the source electrode of the switch tube Sid and the drain electrode of the switch tube Sie, the drain electrode of the switch tube Sid is connected with the positive electrode of the battery Bi-1a, and the source electrode of the switch tube Sie is connected with the negative electrode of the battery Bic.
The grids of all the switching tubes S1a, S1b and S1c and Sia, sib, sic, sid, sie (i=1, 2,3, … and n) are connected with a control circuit, and the energy transfer is realized by controlling the switching tubes to be turned on and off, so that the purpose of balancing the battery pack is achieved.
Fig. 4 (a) -4 (d) are schematic diagrams of the equalization principle of 3 cells in a cell group. The first battery pack is exemplified. When the voltage of the battery B1a is too high as shown in fig. 4 (a), the switching tube S1a is turned on in one PWM period, the current passes through the battery B1a, the switching tube S1a and the inductor L1a form a loop, the inductor L1a stores energy, the Q loop in the figure represents the loop of the current, and the arrow represents the direction of the current. As shown in fig. 4 (B), after the switch tube S1a is turned on for a period of time, the current is turned off, and the current passes through the inductor L1a, the battery B1B, the inductors L2a, D1B (S1B anti-parallel diode) and the inductors L1a, the battery B1B, the batteries B1c, D1c (S1 c anti-parallel diode), the D1B form two closed loops, and the inductor L1a releases energy to the battery B1B and the battery B1c. In order to ensure that the energy storage inductor works in the intermittent mode, the duty ratio of the driving signal of the switching tube S1a is less than 50%.
When the voltage of the battery B1a is too low, the batteries B1B and B1c transfer energy thereto. In one PWM period, the switching tube S1B, the switching tube S1c, the battery B1B, the inductor L1a, the switching tube S1B, the switching tube S1c and the switching tube B1c are simultaneously turned on, the switching tube S1c forms two closed loops, and the inductor L1a and the inductor L1B store energy. When the switching tube is turned on for a certain time, the switching tube is turned off, and current passes through the inductors L1a and D1a (S1 a anti-parallel diodes), the battery B1a, the inductors L1B, D1B and D1a, the switching tube S1a and the switching tube S1B form two closed loops, and the L1a transmits energy to the B1a and the L1B transmits energy to the B1a and the B1B.
When the energy of the battery B1B is too high, the battery B1B transfers energy to the other two batteries. In one PWM period, the switching tube S1B is turned on, and the current passes through the battery B1B, the inductor L1a, the switching tube S1B, and the inductor L1B to form a loop, where the inductor L1a and the inductor L1B store energy simultaneously. After the switching tube is turned on for a period of time, the switching tube is turned off, current passes through the inductors L1a and D1a, the battery B1a and the inductor L1B, the switching tubes S1c and D1c form two closed loops, the inductor L1a transmits energy to the battery B1a, and the inductor L1B transmits energy to the switching tube S1c.
As shown in fig. 4 (c), when the energy of the battery B1B is too low, the batteries B1a and B1c transfer energy thereto. In one PWM period, the switching tube S1a and the switching tube S1c are simultaneously turned on, and the current passes through the battery B1a, the switching tube S1a, the inductor L1a and the battery B1c, the inductor L1B, and the switching tube S1c form two closed loops, and the inductor L1a and the inductor L1B store energy simultaneously. As shown in fig. 4 (D), after the switch tube is turned on for a period of time, the current passes through the inductor L1a, the battery B1B, and the inductors L1B and D1B form a loop, and the inductor L1a and the inductor L1B transfer energy to the battery B1B.
When the battery B1c and the battery B1a are in symmetrical positions, the working principle is consistent with that of the battery B1 a.
Fig. 5 (a) and 5 (b) are schematic diagrams of the equalization principle of adjacent two battery packs. With battery panel m 1 And battery group m 2 For illustration.
As in FIG. 5 (a) when the battery pack m 1 When the energy is too high, the battery group m 1 To battery group m 2 Transferring energy. In one PWM period, the switch tube S2d is turned on, and the current passes through the battery group m 1 The switch tube S2d and the inductor L2c form a loop, and the inductor L2c stores energy. As shown in fig. 5 (b), the switch tube is turned off after a certain period of conduction, the current passes through the inductor L2c, and the battery pack m 2 D2e (switching tube S2e anti-parallel diode) forms a loop, and the inductor L2c transfers energy to the battery pack m 2 。
When the battery is in group m 1 When the energy is too low, the battery group m 2 To battery group m 1 Transferring energy. In one PWM switching period, the switching tube S2e is turned on, and the current passes through the battery pack m 2 The inductor L2c and the switching tube S2e form a loop, and the inductor L2c stores energy. The switch tube is turned off after being conducted for a period of time, the current passes through the inductors L2c and D2D (S2D anti-parallel diode), and the battery pack m 1 Forms a loop, and the inductor L2c releases energy to the battery group m 1 。
Similarly, when battery group m 2 When the energy is too high and too low, the working principle of the energy is the same as that of the battery group m 1 The working process is the same.
Fig. 6 (a) and 6 (b) are two implementations of a 9-battery equalization circuit.
The battery packs in fig. 6 (a) employ a pairwise topology, with equalization being achieved adjacent to the battery packs.
In fig. 6 (b), the battery pack adopts a triplet topology, and the equalization principle is the same as that of the unit cells in the pack.
In summary, the embodiment discloses an equalizing circuit capable of expanding 3n energy storage units, which is easy to expand the number of series energy storage units, can expand 3 battery cells each time, and only needs to increase one expansion sub-circuit without changing the original main circuit structure. The equalizing circuit uses less switching devices and energy storage elements, and 3n energy storage units adopt 5n-2 switching devices and 3n-1 energy storage inductors. The equalization circuit can realize dynamic active equalization on the series energy storage units in the charging, discharging and standing states, improves the unbalanced phenomenon of the series battery pack, improves the available capacity of the battery pack, reduces the maintenance and replacement period of the series battery pack, and prolongs the service life of the battery pack. The balancing circuit is suitable for a battery management system of an energy storage device in an electric automobile or an energy storage power station, and can ensure that each battery is not overcharged and overdischarged in the charging and discharging processes by applying a bidirectional dynamic balancing technology in the battery management system of the series battery, so that the problem of unbalance of the series battery is solved, the service life of the battery is prolonged, the control is simple, the circuit is simple and reliable, and the number of series batteries is easy to expand.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (5)

1. An equalization circuit capable of expanding 3n energy storage units is characterized by comprising 3n series-connected energy storage batteries and n equalization sub-circuits, wherein the 3n series-connected energy storage batteries are respectively connected in series in sequence with B1a, B1B, B1c, B2a, B2B, B2c, … …, bja, bjb, bjc, … … and Bna, bnb, bnc, and each three batteries Bja, bjb, bjc are a battery group m j J=1, 2,3 … n, n total battery subgroups, where n is a positive integer, the n equalization sub-circuits comprising a base equalization sub-circuit Q1 and n-1 extension equalization sub-circuits Qi, i=2, 3, …, n;
the basic equalization subcircuit Q1 consists of inductors L1a and L1b and switching tubes S1a, S1b and S1c and is used for taking charge of a battery pack m 1 Between the batteries B1a, B1B, B1cThe switch tubes S1a, S1b and S1c are N-channel MOSFETs and respectively comprise a source electrode, a drain electrode and a grid electrode;
in the basic equalization subcircuit Q1, one end of an inductor L1a is connected with the cathode of a battery B1a, and the other end of the inductor L1a is connected with the source electrode of a switching tube S1a and the drain electrode of a switching tube S1B; one end of the inductor L1B is connected with the cathode of the battery B1B, and the other end of the inductor L1B is connected with the source electrode of the switch tube S1B and the drain electrode of the switch tube S1 c; the drain electrode of the switch tube S1a is connected with the positive electrode of the battery B1a, and the source electrode of the switch tube S1c is connected with the negative electrode of the battery B1 c;
the extended equalization subcircuit Qi consists of an inductor Lia, lib, lic and a switch tube Sia, sib, sic, sid, sie, wherein one end of the inductor Lia is connected with the cathode of the battery Bia, the other end of the inductor Lia is connected with the source electrode of the switch tube Sia and the drain electrode of the switch tube Sia, one end of the inductor Lib is connected with the cathode of the battery Bib, the other end of the inductor Lib is connected with the source electrode of the switch tube Sia and the drain electrode of the switch tube Sic, the drain electrode of the switch tube Sia is connected with the anode of the battery Bia, the source electrode of the switch tube Sic is connected with the cathode of the battery Bic, and the switch tube Sid, the switch tube Sie and the inductor lc are responsible for the battery pack m i And battery group m i-1 One end of the inductor Lic is connected with the positive electrode of the battery Bia, the other end of the inductor Lic is connected with the source electrode of the switching tube Sid and the drain electrode of the switching tube Sie, the drain electrode of the switching tube Sid is connected with the positive electrode of the battery Bi-1a, and the source electrode of the switching tube Sie is connected with the negative electrode of the battery Bic;
the grid electrodes of the switching tubes S1a, S1b, S1c and Sia, sib, sic, sid, sie are connected with a control circuit, and the switching tubes are controlled to be turned on and off by driving signals output by the control circuit so as to realize energy transfer;
the 3n series energy storage batteries are easy to expand the battery group m i I.e. three batteries Bia, bib, bic, while the equalization circuit adds an extended equalization subcircuit Qi.
2. An equalization circuit scalable to 3n energy storage cells as defined in claim 1, wherein,
the inductors in the equalization circuit are energy storage inductors, the energy storage inductance value is determined by the switching frequency of the switching tube, the voltage of the battery cell and/or the equalization time selection of the equalization circuit, and the inductance values of different energy storage inductors can meet the requirements of different equalization times.
3. An equalization circuit scalable to 3n energy storage cells as defined in claim 1, wherein,
the frequency of the driving signal output by the control circuit is determined according to the switching loss of the switching tube, the inductance value of the energy storage inductor, and the voltage and capacity of the battery cell.
4. An equalization circuit scalable to 3n energy storage cells as defined in claim 1, wherein,
the duty ratio of the driving signal output by the control circuit is selected and determined according to the working condition of the equalization sub-circuit, so that each inductor is ensured to reset in each switching period, namely the current of the energy storage inductor in each switching period finally drops to zero, and the inductor works in an intermittent mode.
5. An equalization circuit as recited in any of claims 1-4, wherein said 3n energy storage cells are secondary batteries, including lithium ion batteries, lead acid batteries, supercapacitors, or nickel hydrogen batteries.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204947676U (en) * 2015-09-15 2016-01-06 华南理工大学 A kind of battery pack layering equalizing circuit
CN105529777A (en) * 2016-01-28 2016-04-27 华南理工大学 2n battery pack equalizing circuit easy to expand
CN105978052A (en) * 2016-01-19 2016-09-28 合肥工业大学 Novel battery pack equalization circuit based on Buck-boost

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204947676U (en) * 2015-09-15 2016-01-06 华南理工大学 A kind of battery pack layering equalizing circuit
CN105978052A (en) * 2016-01-19 2016-09-28 合肥工业大学 Novel battery pack equalization circuit based on Buck-boost
CN105529777A (en) * 2016-01-28 2016-04-27 华南理工大学 2n battery pack equalizing circuit easy to expand

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