CN115276170B - Balanced adjustment method for high-efficiency energy-storage multi-battery-pack parallel circuit - Google Patents
Balanced adjustment method for high-efficiency energy-storage multi-battery-pack parallel circuit Download PDFInfo
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- CN115276170B CN115276170B CN202210963074.XA CN202210963074A CN115276170B CN 115276170 B CN115276170 B CN 115276170B CN 202210963074 A CN202210963074 A CN 202210963074A CN 115276170 B CN115276170 B CN 115276170B
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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
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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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- 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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method for balancing and adjusting a parallel circuit of a high-efficiency energy storage multi-battery pack in the field of batteries, which comprises the following steps: presetting a first voltage threshold U0 and a second voltage threshold U1; detecting voltage values of a high-voltage output end and a low-voltage output end of each group of voltage selection circuits to obtain a highest-voltage battery pack and a lowest-voltage battery pack, and calculating a voltage difference value delta U between the highest-voltage battery pack and the lowest-voltage battery pack; judging the voltage difference value delta U, a first voltage threshold value U0 and a second voltage threshold value U1; if the delta U is larger than U0, the highest voltage battery pack charges the lowest voltage battery pack through the regulating circuit and the voltage selecting circuit; and (4) closing the main control switch until the delta U is less than U1, and realizing the parallel connection of the plurality of battery packs. The voltage selection circuit automatically controls and adjusts the voltage balance of the multi-battery pack, the control method is simple and easy to realize, the circuit structure is simple, and the realization cost is low.
Description
Technical Field
The invention relates to the field of batteries, in particular to a balance adjustment method for a high-efficiency energy storage multi-battery-pack parallel circuit.
Background
As shown in fig. 1, in the existing parallel connection mode of battery packs, each battery pack includes two relays and a current-limiting resistor, and in the process of large parallel connection and large series connection of an energy storage system, energy is transferred from a high-voltage battery to a low-voltage battery and is consumed by the current-limiting resistor, and under the condition of severe mismatch of the battery packs, a large circulating current is generated in the parallel connection process of the batteries, which causes great energy loss of the system.
In view of the above technical problems, many manufacturers consider using new forms of parallel connection methods and circuits.
Chinese patent CN110994742A discloses a system and a method for multi-battery pack parallel charging operation, which adopts an electric type controlled charging battery pack and a method for converting charging by utilizing a built-in switch of a compound open-close protection, so that the battery pack becomes a charging component with a specific controlled electric type, the input volt-ampere characteristic of the battery pack is controlled, and the equivalent input impedance is controlled; the intelligent programmable modular device is programmable, limited in input power and input current, unidirectional in charging and intelligent programmable. However, the energy storage battery pack disclosed by the patent has two systems of charging and discharging, so that the system cost is high, and the control is relatively complex.
Chinese patent CN110690752A discloses a BMS management method for multi-battery pack parallel control, comprising the steps of: a, electrifying a system for operation; b, performing system self-check; c, if the self-tests of the two battery packs are passed, selecting the power loop of the battery pack with larger total voltage to be conducted, and maintaining the power loop of the other battery pack in a disconnected state; d, if the received charging instruction is received, executing the operation of switching the single battery packs to work, and selecting the battery pack with higher total voltage to work; e, when the total voltage difference is reduced to a set minimum allowable threshold VoltDown, the operation of switching the double battery packs to work in parallel by the single battery packs is executed; and F, performing the operation of switching the work of the single battery pack by the multi-battery pack. In the control process, as the largest battery pack loop in the patent is the leading way, when the number of the battery packs is large, the complexity of the control process is multiplied, and the control process cannot be applied to large-scale parallel connection of the battery packs.
Chinese patent CN103762635A discloses a method and system for balancing current for parallel charging or discharging of multiple batteries or multiple battery packs, and proposes a method and system for balancing current suitable for discontinuous current, simple and effective to implement for parallel discharging or charging of multiple batteries or multiple battery packs. The method and system include a plurality of parallel branches formed by a plurality of batteries or battery packs, each parallel branch including a battery or battery pack, a low resistance switch path, and a voltage dropping component path, the low resistance switch path and the voltage dropping component path being connected in parallel. When the low-resistance switch is closed, the discharging or charging current only flows through the low-resistance switch channel, the on-off of the low-resistance switch is controlled through pulse width adjustment, and the discharging or charging current of the battery or the battery pack is adjusted in real time; when the low-resistance switch is switched off, the current only flows through the voltage reduction component passage, and the voltage reduction component adjusts the voltage of the battery or the battery pack relative to other batteries or battery packs. Through time integration, the balance of the total charge or discharge charge number of a plurality of batteries or battery packs is realized by adopting a plurality of algorithms, and further, the balance control of discharge current or charge current during the parallel discharge or charge of the plurality of batteries or battery packs is realized. However, each battery pack of the patent is provided with a low-resistance switch path and a voltage reduction component path, and the low-resistance switch path has a regulation function, so that the system cost is high, and each battery pack needs a set of control circuit and system, so that the system is complex.
Therefore, the parallel battery connection method in the prior art has the defects of complex control mode, high cost and the like, and the applicant provides an improvement scheme for the method.
Disclosure of Invention
The invention aims to provide a balance adjusting method of an efficient energy storage multi-battery pack parallel circuit. The circuit structure is simple, the circulation current is effectively controlled while the efficiency is greatly improved in the parallel connection process of the battery packs, the method is efficient, and the realization cost is low.
In order to achieve the purpose, the invention provides the following technical scheme:
a balance adjustment method for a high-efficiency energy-storage multi-battery-pack parallel circuit comprises an adjustment circuit, a voltage selection circuit and a main control switch; the first ends of the battery packs are connected with the adjusting circuit together, the second ends of the battery packs are respectively connected with a group of main control switches and a voltage selection circuit, the voltage selection circuits are all connected with the corresponding main control switches in parallel, and the high-voltage output end and the low-voltage output end of the voltage selection circuit are respectively connected with the adjusting circuit; the method comprises the following steps:
presetting a first voltage threshold U0 and a second voltage threshold U1;
detecting voltage values of a high-voltage output end and a low-voltage output end of each group of voltage selection circuits to obtain a highest-voltage battery pack and a lowest-voltage battery pack, and calculating a voltage difference value delta U between the highest-voltage battery pack and the lowest-voltage battery pack;
judging the voltage difference value delta U, a first voltage threshold value U0 and a second voltage threshold value U1;
if the delta U is larger than U0, the highest voltage battery pack charges the lowest voltage battery pack through the regulating circuit and the voltage selecting circuit; and (4) closing the main control switch until the delta U is less than U1, and realizing the parallel connection of the plurality of battery packs.
Furthermore, the regulating circuit comprises a power switch tube, a current-limiting inductor and a freewheeling diode, when the power switch tube is conducted, the highest voltage battery pack and the lowest voltage battery pack are connected through the voltage selection circuit, the power switch tube and the current-limiting inductor to form a charging and discharging loop, and the highest voltage battery pack charges the lowest voltage battery pack; when the power switch tube is turned off, the lowest voltage battery pack is connected through the voltage selection circuit, the current-limiting inductor and the freewheeling diode to form a freewheeling charging loop, and the current-limiting inductor charges the lowest voltage battery pack.
Furthermore, each group of voltage selection circuits comprises a low-voltage selection circuit and a high-voltage selection circuit; the highest voltage battery pack forms a discharging loop through a low-voltage selection circuit, and the lowest voltage battery pack forms a charging loop through a high-voltage selection circuit.
Further, a time threshold T0 is preset, and if the voltage difference value Δ U between the highest voltage battery pack and the lowest voltage battery pack is continuously smaller than the second voltage threshold U1 within the time threshold T0, it is determined that Δ U is smaller than U1, and the main control switch is closed.
Further, the high-voltage selection circuit is configured as a first diode, the anode of the first diode is connected with the battery pack, and the cathode of the first diode is connected with one end of the regulating circuit.
Further, the low-voltage selection circuit is configured as a second diode, the cathode of the second diode is connected with the battery pack, and the anode of the second diode is connected with one end of the regulating circuit.
Furthermore, the main control switch is configured as a normally open switch, and the normally open switch is connected in parallel at two ends of the high-voltage selection circuit or the low-voltage selection circuit.
Furthermore, the high-voltage selection circuit and the main control switch are jointly configured into a switch tube with a body diode, the anode of the body diode is connected with the battery pack, and the cathode of the body diode is connected with the regulating circuit.
Furthermore, the low-voltage selection circuit and the main control switch are jointly configured into a switch tube with a body diode, the cathode of the body diode is connected with the battery pack, and the anode of the body diode is connected with the regulating circuit.
Has the beneficial effects that: the multi-battery pack of the invention shares one regulating circuit, and the voltage balance of the multi-battery pack is automatically controlled and regulated by the voltage selection circuit. The parallel circuit is controlled to enter and exit the node for voltage balance adjustment of the battery pack through the preset voltage threshold, the control method is simple and easy to implement, the circuit structure is simple, and the implementation cost is low.
Drawings
Fig. 1 is a parallel connection schematic diagram of a battery pack of the prior art.
FIG. 2 is a flow chart of the method of the present invention.
Fig. 3 is a schematic block diagram of the parallel circuit of the present invention.
Fig. 4 is a schematic diagram of embodiment 1 of the present invention.
Fig. 5 is a schematic view of a charge and discharge circuit of embodiment 1.
Fig. 6 is a schematic diagram of a freewheel charging circuit according to embodiment 1.
Fig. 7 is a control block diagram of the present invention.
Fig. 8 is a schematic diagram of embodiment 2 of the present invention.
Fig. 9 is a schematic diagram of embodiment 3 of the present invention.
Fig. 10 is a schematic diagram of embodiment 4 of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 3, the high-efficiency energy-storage multi-battery-pack parallel circuit includes a regulating circuit, a voltage selecting circuit and a main control switch; the battery pack comprises at least two batteries, the anodes of the battery packs are directly connected in parallel and are commonly connected with the regulating circuit, the cathodes of the battery packs are respectively connected with a group of main control switches and a voltage selection circuit, and each group of voltage selection circuits are connected with corresponding main control switches in parallel. The low-voltage output end and the high-voltage output end of each voltage selection circuit are respectively connected with the low-voltage end and the high-voltage end of the regulating circuit, and the high-voltage output end or the low-voltage output end can be used as a negative level of the battery pack system.
As shown in fig. 2, the equalization adjusting method of the multi-battery parallel circuit includes:
presetting a first voltage threshold value U0 and a second voltage threshold value U1, wherein the first voltage threshold value U0 is a voltage given value which is set by an upper computer or software and enters the voltage equalization regulation, the second voltage threshold value U1 is a voltage given value which exits the voltage equalization regulation, and U1 is more than U0 and less than 1V. The voltage threshold U0 is selected and calculated as follows:
U0<I k ×R Ω
in the formula: i is k Maximum current allowed for the battery system, R Ω Is the ohmic internal resistance of the battery.
The voltage threshold U1 is selected and calculated as follows:
U1<I E ×R Ω
in the formula: i is E At or below the rated current of the battery pack, R Ω Is the ohmic internal resistance of the battery.
Detecting voltage values of a high-voltage output end and a low-voltage output end of each group of voltage selection circuits to obtain a highest-voltage battery pack and a lowest-voltage battery pack, and calculating a voltage difference value delta U between the highest-voltage battery pack and the lowest-voltage battery pack;
judging the magnitude of the voltage difference value delta U, the first voltage threshold value U0 and the second voltage threshold value U1;
if Δ U > U0, it is considered that there is a voltage imbalance problem in the multi-battery pack, and if the main control switch is closed at this time, a large inrush current may be generated between the battery packs, and the inrush current exceeds the maximum current allowed by the system, which may cause problems such as overcurrent protection or device damage. Therefore, the adjusting circuit is started, and the highest voltage battery pack charges the lowest voltage battery pack through the adjusting circuit and the voltage selection circuit. If delta U is less than or equal to U0, the impact current is in a safe and controllable range, and the main control switch can be directly attracted to realize the parallel connection of the multiple battery packs.
After repeated sampling detection and battery pack charging and discharging balance adjustment, if the voltage difference value delta U between the current highest voltage battery pack and the current lowest voltage battery pack is detected to be larger than or equal to a second voltage threshold value U1, the voltage balance problem still exists among the multiple battery packs, and the current detected highest voltage battery pack charges the lowest voltage battery pack. Until delta U is less than U1, the multi-battery pack realizes voltage equalization at the moment, the regulating circuit stops working, and the main control switch is closed to realize the parallel connection of the plurality of battery packs.
In embodiment 1, as shown in fig. 4, three battery packs are taken as an example and are respectively referred to as a first battery pack, a second battery pack and a third battery pack, anodes of the three battery packs are connected, cathodes of the three battery packs are respectively connected with a group of voltage selection circuits, each group of voltage selection circuits comprises a low-voltage selection circuit and a high-voltage selection circuit, and a main control switch is connected in parallel at two ends of the high-voltage selection circuit.
In this embodiment, the high voltage selection circuit is configured as a first diode, and the first diodes connected to the three battery packs are D1A, D2A, and D3A, respectively; the low-voltage selection circuit is configured to be a second diode, and the second diodes connected with the three battery packs are respectively D1B, D2B and D3B; the main control switch is configured to be a normally open switch (low resistance), and the normally open switches connected with the three battery packs are respectively K1, K2 and K3. The regulating circuit comprises a power switch tube Q1, a current-limiting inductor L and a freewheeling diode D5. The power switch tube Q1 may be configured as a MOS tube, an IGBT tube, or a triode, and the present embodiment takes an NMOS tube as an example.
The first battery pack is connected with the anode of the first diode D1A and the cathode of the second diode D1B, and the normally-open switch K1 is connected in parallel at two ends of the first diode D1A. The second battery pack is connected with the anode of the first diode D2A and the cathode of the second diode D2B, and the normally open switch K2 is connected with two ends of the first diode D2A. The third battery pack is connected with the anode of the first diode D3A and the cathode of the second diode D3B, and the normally-open switch K3 is connected with two ends of the first diode D3A.
Cathodes of the first diodes D1A, D2A, D3A are commonly connected to a first end of the current-limiting inductor L, a second end of the current-limiting inductor L is connected to a drain of the power switch tube Q1, and a source of the power switch tube Q1 is connected to anodes of the second diodes D1B, D2B, D3B. One end of a freewheeling diode D5 is connected with the common end of the current-limiting inductor L and the power switch tube Q1, and the other end is connected with the common anode of the three battery packs.
The output end of the high-voltage selection circuit, namely the high-voltage output end, is the common cathode of each first diode, automatically selects the cathode highest level of each battery pack, and is the lowest-voltage battery pack relative to the battery pack system; the output end of the low-voltage selection circuit, namely the low-voltage output end, is the common anode of each second diode, and automatically selects the cathode lowest level of each battery pack, namely the highest-voltage battery pack relative to the battery pack system. The highest voltage and the lowest voltage battery pack of the battery pack system are automatically selected through the master switch and the high-voltage and low-voltage selection circuits and are connected to the regulating circuit.
The high-frequency switch tube, the current-limiting inductor and the follow current loop form a current type BUCK circuit, so that the energy of the high-voltage battery pack is converted into the energy of the low-voltage battery pack, the conversion between the energy and the voltage is realized, the voltage of the high-voltage battery pack is reduced, the voltage of the low-voltage battery pack is raised, when the voltage of the lowest-voltage battery pack is raised to be consistent with that of the next-lower-voltage battery pack, the lowest voltage of the low-voltage battery pack and the lowest-voltage battery pack is automatically selected by the low-voltage selection circuit, the conversion of the energy from the highest-voltage battery pack to the lowest-voltage battery pack is realized, and finally, the consistency of the voltages of all the battery packs is realized, so that conditions are created for the actuation of the main control switch and the parallel connection of the multiple battery packs.
By adopting the parallel circuit of the embodiment, the equalization adjusting method is as follows:
the system is electrified, the power switch tube Q1 is controlled to be switched on and switched off by the control circuit, the voltage selection circuit automatically obtains the voltage of the negative end of the highest voltage battery pack at the low-voltage output end, obtains the voltage of the negative end of the lowest voltage battery pack at the high-voltage output end, and obtains the highest voltage battery pack and the lowest voltage battery pack through detection and judgment.
Assuming that the first battery pack is the highest voltage battery pack and the third battery pack is the lowest voltage battery pack, the negative terminal of the first battery pack is the lowest level of the parallel system, the low voltage output terminal of the corresponding voltage selection circuit is connected, and the high voltage output terminal of the corresponding voltage selection circuit of the corresponding third battery pack is connected.
As shown in fig. 5, if the voltage difference Δ U between the first battery pack and the third battery pack is greater than the first threshold voltage U0, the control circuit sends a PWM control signal to the power switch Q1, the power switch Q1 is turned on, the first battery pack and the third battery pack are connected through the second diode D1B, the first diode D3A, the power switch Q1, and the current-limiting inductor L to form a charge-discharge loop, and the first battery pack charges the third battery pack.
As shown in fig. 6, the control circuit controls the power switch Q1 to turn off, and since the current in the current-limiting inductor L cannot change suddenly, the third battery pack is connected through the first diode D3A, the current-limiting inductor L and the freewheeling diode D5 to form a freewheeling charging loop, and the current-limiting inductor charges the third battery pack.
In the above process, the third battery pack is always in a charging state, the first battery pack is in a discharging state, and the energy of the battery pack (the first battery pack) with the highest voltage is charged to the lowest battery pack (the third battery pack) through the regulating circuit, so that the process of transferring the energy from the highest battery pack to the lowest battery pack is completed.
When voltage detection is carried out again, if the voltage of the second battery pack is the highest and the voltage of the first battery pack is the lowest at the moment, the low-voltage selection circuit of the second battery pack is conducted, the high-voltage selection circuit of the first battery pack is conducted, and the energy of the second battery pack is transferred to the first battery pack through the adjusting circuit.
The adjusting process is repeated until the voltage detecting circuit repeatedly samples and detects that the voltage difference delta U between the highest-voltage battery pack and the lowest-voltage battery pack in the three battery packs is less than U1, timing is started from T =0, if the voltage difference delta U is equal to the voltage difference delta U within a preset time threshold T0, the voltage of the multiple battery packs is judged to be balanced, and the control circuit controls the closed normally-open switches K1, K2 and K3 through the communication system to achieve parallel connection of the three battery packs. If Δ U < U1 does not hold within the preset time threshold T0, the timer is cleared (T = 0), and the adjustment circuit performs the above adjustment process again for each battery pack.
As shown in fig. 7, in the entire battery pack system, the voltage difference Δ V between the lowest voltage battery pack and the highest voltage battery pack is the voltage loop feedback amount, and the voltage outer loop control loop is given as 0, which form a voltage outer loop control system; the output quantity of the voltage outer ring is used as a given value ILref of the current inner ring, the real-time current IL is used as a feedback quantity to adjust the output current of the current limiting inductor, and the current is adjusted to the given value of the current ring; under the regulation of the current inner loop, the setting and feedback are regulated in real time through PI control parameters, a duty ratio D is output and acts on the power switch tube Q1 in real time, so that the current is limited, and the energy balance from the high-voltage battery pack to the low-voltage battery pack is realized.
In the closed-loop control system of the voltage regulating circuit, the given inductance current loop is always limited within the allowed maximum limiting current for the stability and reliability of the battery system; the output of the inductance current loop is used as duty ratio drive to act on the power switch tube, so that the voltage between two different battery packs is converted quickly and efficiently.
It should be noted that, in this embodiment, three battery packs are taken as an example, when more than three battery packs are connected in parallel, the low-voltage end of the voltage selection circuit corresponding to the highest-voltage battery pack is turned on, the high-voltage end of the voltage selection circuit corresponding to the lowest-voltage battery pack is turned on, and energy can be transferred from the highest-voltage battery pack to the lowest-voltage battery pack through the adjustment circuit. The adjusting (equalizing) circuit may be in various forms and is not limited to one form of the embodiment.
Embodiment 2, as shown in fig. 8, differs from embodiment 1 in that the main control switch is connected in parallel to two ends of the low voltage selection circuit, and the method of equalization adjustment is the same as embodiment 1, and is not described again.
In embodiment 3, as shown in fig. 9, the low voltage selection circuit is configured as a second diode, the high voltage selection circuit and the main control switch are configured as switch tubes with diodes, taking three battery packs as an example, the three switch tubes connected to the three battery packs are QD1A, QD2A and QD3A, respectively, wherein an anode of the body diode is connected to the battery pack, and a cathode thereof is connected to the adjustment circuit.
In the embodiment, the main control switch and the high-voltage selection circuit are combined into a whole, the volume of the battery pack system is greatly reduced, the power density is improved, and the switch tubes need additional control circuits for QD1A, QD2A and QD3A to control. When the balance adjustment method is implemented, if delta U is larger than U0, when the control circuit controls the power switch tube Q1 to be conducted, the second diode corresponding to the highest-voltage battery pack is conducted, the body diode of the switch tube corresponding to the lowest-voltage battery pack is conducted, and the highest-voltage battery pack charges the lowest-voltage battery pack; when the control circuit controls the power switch tube Q1 to be turned off, the switch tube corresponding to the lowest voltage battery pack forms a follow current charging loop through the current-limiting inductor L and the follow current diode D5. And when the delta U is less than U1, the switch tubes corresponding to all the battery packs are conducted, so that the parallel connection of the plurality of battery packs is realized.
Embodiment 4, as shown in fig. 10, the high voltage selection circuit is configured as a first diode, and the low voltage selection circuit and the main switch are configured as a switch tube with a diode. Taking three battery packs as an example, three switching tubes connected with the three battery packs are respectively QD1B, QD2B, QD3B, wherein the cathode of the body diode is connected with the battery packs, and the anode is connected with the regulating circuit.
The implementation principle of this embodiment is basically the same as that of the above embodiment, and is not described again.
It should be noted that the regulating circuit in the above embodiments may take various forms, and is not limited to the above, for example, the freewheeling diode may be replaced by a switching tube with a diode.
The invention has at least the following advantages:
1. the control method is simple, the voltage selection circuit automatically selects the highest voltage battery pack and the lowest voltage battery pack, and only the regulating circuit is controlled, so that the balance of all battery packs of the system can be realized, the control logic is simple and efficient, and the conversion efficiency is greatly improved;
2. the whole battery pack system shares one regulating circuit and one power switch tube, so that the battery pack system is greatly simplified, and the cost is greatly reduced;
3. before the main control switch of the battery pack is closed, high-efficiency energy conversion and voltage conversion of mismatched batteries are realized, so that impact current at closing moment is reduced;
4. the voltage of the multi-battery pack can be automatically balanced, the circulation current can be effectively restrained while the energy loss is reduced, the cost is low, and the effect is good.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application; all the equivalent changes made within the scope of the claims of the present application are the protection scope of the claims of the present application.
Claims (8)
1. The method for balancing and adjusting the high-efficiency energy-storage multi-battery-pack parallel circuit is characterized in that the parallel circuit comprises an adjusting circuit, a voltage selection circuit and a main control switch; the first ends of the battery packs are connected with the adjusting circuit together, and the second ends of the battery packs are connected with a group of main control switches and a voltage selection circuit respectively; the voltage selection circuits are connected with corresponding main control switches in parallel, and the high-voltage output end and the low-voltage output end of each voltage selection circuit are respectively connected with the regulating circuit; the method comprises the following steps:
presetting a first voltage threshold U0 and a second voltage threshold U1;
detecting voltage values of a high-voltage output end and a low-voltage output end of each group of voltage selection circuits to obtain a highest-voltage battery pack and a lowest-voltage battery pack, and calculating a voltage difference value delta U between the highest-voltage battery pack and the lowest-voltage battery pack;
judging the voltage difference value delta U, a first voltage threshold value U0 and a second voltage threshold value U1;
if the delta U is larger than U0, the highest voltage battery pack charges the lowest voltage battery pack through the regulating circuit and the voltage selecting circuit; until delta U is less than U1, closing the main control switch to realize the parallel connection of a plurality of battery packs;
the regulating circuit comprises a power switch tube, a current-limiting inductor and a freewheeling diode, when the power switch tube is conducted, the highest voltage battery pack and the lowest voltage battery pack are connected through a voltage selection circuit, the power switch tube and the current-limiting inductor to form a charging and discharging loop, and the highest voltage battery pack charges the lowest voltage battery pack; when the power switch tube is turned off, the lowest voltage battery pack is connected through the voltage selection circuit, the current-limiting inductor and the freewheeling diode to form a freewheeling charging loop, and the current-limiting inductor charges the lowest voltage battery pack.
2. The method for balancing and adjusting the high-efficiency energy-storage multi-battery-pack parallel circuit according to claim 1, wherein each group of voltage selection circuits comprises a low-voltage selection circuit and a high-voltage selection circuit; the highest voltage battery pack forms a discharging loop through a low-voltage selection circuit, and the lowest voltage battery pack forms a charging loop through a high-voltage selection circuit.
3. The method as claimed in claim 1, wherein a time threshold T0 is preset, and if the voltage difference Δ U between the highest voltage battery pack and the lowest voltage battery pack is continuously smaller than a second voltage threshold U1 within the time threshold T0, it is determined that Δ U < U1, and the main control switch is closed.
4. The method of claim 2, wherein the high voltage selection circuit is configured as a first diode, an anode of the first diode is connected to the battery pack, and a cathode of the first diode is connected to one end of the regulation circuit.
5. The method of claim 2, wherein the low voltage selection circuit is configured as a second diode, the cathode of the second diode is connected to the battery pack, and the anode of the second diode is connected to the other end of the regulation circuit.
6. The method for balancing and regulating the high-efficiency energy-storage multi-battery-pack parallel circuit according to claim 4 or 5, wherein the master switch is configured as a normally open switch, and the normally open switch is connected in parallel to two ends of the high-voltage selection circuit or the low-voltage selection circuit.
7. The method as claimed in claim 4, wherein the high voltage selection circuit and the master switch are configured as a switch tube with a body diode, the anode of the body diode is connected to the battery pack, and the cathode of the body diode is connected to the regulation circuit.
8. The method as claimed in claim 5, wherein the low voltage selection circuit and the main control switch are configured as a switch tube with a body diode, the cathode of the body diode is connected to the battery pack, and the anode of the body diode is connected to the regulation circuit.
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| CN204118761U (en) * | 2014-01-09 | 2015-01-21 | 慈松 | A kind of current balance control system for many batteries or many battery pack charged in parallel or electric discharge |
| CN110620413A (en) * | 2019-10-14 | 2019-12-27 | 河北电立方新能源科技有限公司 | Energy equalization circuit of battery system |
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| JP2013123274A (en) * | 2011-12-09 | 2013-06-20 | Nissan Motor Co Ltd | Battery pack controller |
| CN103762635B (en) * | 2014-01-09 | 2016-05-18 | 慈松 | A kind of method and system of the current balance for many batteries or many battery pack charged in parallel or electric discharge |
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| CN112467811B (en) * | 2019-09-06 | 2023-04-07 | 华为技术有限公司 | Double-battery voltage balancing method and double-battery voltage balancing circuit |
| CN213959800U (en) * | 2020-12-24 | 2021-08-13 | 合肥华思系统有限公司 | Battery management execution device of low-voltage energy storage system |
| CN113489032B (en) * | 2021-05-31 | 2023-05-30 | 南方电网调峰调频发电有限公司 | Battery energy storage circuit and battery energy storage system |
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| CN110620413A (en) * | 2019-10-14 | 2019-12-27 | 河北电立方新能源科技有限公司 | Energy equalization circuit of battery system |
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