Wireless equalization control system and method for battery cells in energy storage battery pack

Abstract

The invention relates to the technical field of energy storage systems, and discloses a wireless equalization control system and method for battery cells in an energy storage battery pack. The wireless acquisition equalization board comprises an acquisition equalization controller, a cell data acquisition module, a first wireless communication module, a radio frequency transmitting module and a radio frequency receiving module, and the radio frequency transmitting module and the radio frequency receiving module are used for realizing wireless transmission of electric energy; the equalization control panel comprises a battery pack equalization controller and a second wireless communication module; and the wireless acquisition equalization board receives a charging or discharging instruction issued by the equalization control board, and controls the radio frequency receiving module or the radio frequency transmitting module to work so as to carry out electric quantity equalization control among different single battery cells. The wireless radio frequency technology is adopted, energy transfer between the battery cells is achieved under the condition that physical wires are not used, the internal wiring harness structure of the battery pack is simplified, and the balancing efficiency and safety of the battery cells are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and particularly to a wireless equalization control system and method for battery cells in an energy storage battery pack. Background Art

[0002] In order to meet the energy storage voltage requirements, a battery pack usually consists of dozens or even hundreds of single cells connected in series. Due to the capacity differences among the battery cells in the battery pack, the inconsistency among the single cells increases during the use of the battery pack, and the cell with the worst performance determines the overall performance of the battery pack. For example, when there is a voltage difference between the cells, some cells may be overcharged or over-discharged, resulting in thermal runaway, short circuit or other safety hazards, thereby affecting the service life of the battery pack. During the charging and discharging process of the battery pack, in order to improve the overall capacity of the battery pack, it is necessary to perform charge / discharge equalization on the battery cells in the battery pack.

[0003] Currently, the equalization technology of energy storage battery packs in existing energy storage power stations or electric vehicles mainly uses wires pulled out from both poles of each cell to an external control circuit board of the battery pack to perform discharge equalization on a certain or several cells in the pack. The above method requires each cell to lead out an equalization wire, which will bring the risk of short circuit and fire. Therefore, how to improve the cell equalization scheme in the battery pack and eliminate the short circuit and fire risks caused by wires has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a wireless equalization control system and method for battery cells in an energy storage battery pack, which uses radio frequency technology to achieve energy transfer between cells without using physical wires, simplifies the internal wiring harness structure of the battery pack, and improves the equalization efficiency and safety of the cells.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] A wireless equalization control system for battery cells in an energy storage battery pack includes a battery pack and an equalization control board provided on the front panel of the battery pack. A plurality of series-connected single cells are arranged in the battery pack, and a wireless acquisition and equalization board is installed on each single cell. The wireless acquisition and equalization board includes an acquisition and equalization controller, a cell data acquisition module, a first wireless communication module, a radio frequency transmission module, and a radio frequency reception module that are electrically connected to the acquisition and equalization controller. The cell data acquisition module is electrically connected to the single cell and is used for acquiring cell data. The radio frequency transmission module is used for converting the power of the single cell where it is located into a radio frequency signal and transmitting it to other single cells. The radio frequency reception module is used for receiving the radio frequency signal emitted by the radio frequency transmission module of other single cells;

[0007] The balance control board includes a battery pack balance controller and a second wireless communication module electrically connected to the battery pack balance controller. The second wireless communication module is wirelessly connected to the first wireless communication module. The wireless acquisition and balance board receives the charging or discharging instructions issued by the balance control board and controls the operation of the radio frequency receiving module or the radio frequency transmitting module to perform power balance control between different single cells.

[0008] Further, the outside of the wireless acquisition and balance board is covered with a first insulating housing. A reserved hole is provided on the first insulating housing. The positive and negative electrodes of the wireless acquisition and balance board are connected to the single cells through wires, and the wires pass through the reserved hole. The single cells supply power to the wireless acquisition and balance board.

[0009] Further, the balance control board is located inside the battery pack, and the outside of the balance control board is covered with a second insulating housing.

[0010] Further, the wireless acquisition and balance board further includes a first storage module connected to the acquisition and balance controller, and the balance control board further includes a second storage module connected to the battery pack balance controller.

[0011] Further, the balance control board further includes an external communication interface, an external power supply interface, and a display module connected to the battery pack balance controller.

[0012] Further, both the first wireless communication module and the second wireless communication module adopt Zigbee communication modules.

[0013] Further, the cell data acquisition module includes a variety of sensors and an analog-to-digital converter connected to the sensors. The variety of sensors include voltage, current, and temperature sensors, which are respectively used to collect the voltage, current, and temperature of the single cells. The analog-to-digital converter is electrically connected to the acquisition and balance controller.

[0014] Further, the radio frequency transmitting module includes a radio frequency oscillator, a radio frequency amplifier, and a transmitting antenna. After the wireless acquisition and balance board receives the discharging instruction issued by the balance control board, the acquisition and balance controller controls the radio frequency oscillator to generate a radio frequency signal. The radio frequency signal is amplified by the radio frequency amplifier and then transmitted through the transmitting antenna to realize the discharging of the single cells.

[0015] The radio frequency receiving module includes a receiving antenna, an impedance matching circuit, a rectifying circuit, and a voltage stabilizing circuit. When the wireless acquisition and balance board receives the charging instruction issued by the balance control board, the acquisition and balance controller controls the receiving antenna to receive the radio frequency signal. After the radio frequency signal undergoes impedance matching by the impedance matching circuit, rectification by the rectifying circuit, and voltage stabilization by the voltage stabilizing circuit, it charges the single cells.

[0016] The present invention also discloses a wireless equalization control method for battery cells in an energy storage battery pack, which is applied to the wireless equalization control system for battery cells in the above-mentioned energy storage battery pack, and includes the following steps:

[0017] System initialization, setting the equalization threshold;

[0018] The equalization control board starts to work and sends a wireless acquisition equalization board activation signal to each single battery cell;

[0019] After the wireless acquisition equalization board of each single battery cell feeds back the activation signal, the battery cell data acquisition module real-time acquires the battery cell data of the single battery cell and uploads it to the equalization control board;

[0020] The equalization control board judges whether the voltage difference between battery cells in the battery pack reaches the equalization start condition based on the battery cell data of each single battery cell in the battery pack;

[0021] If so, the equalization control board sends a discharge instruction to the wireless acquisition equalization board of the single battery cell with the maximum voltage in the battery pack, and sends a charging instruction to the wireless acquisition equalization board of the single battery cell with the minimum voltage in the battery pack;

[0022] The wireless acquisition equalization board of the single battery cell with the maximum voltage controls the radio frequency transmitting module connected to it to emit a radio frequency signal for discharging; the wireless acquisition equalization board of the single battery cell with the minimum voltage controls the radio frequency receiving module connected to it to receive the radio frequency signal for charging;

[0023] The equalization control board judges whether the voltage difference between battery cells in the battery pack reaches the equalization stop condition based on the battery cell data of each single battery cell in the battery pack;

[0024] If so, the equalization control board sends a stop equalization instruction to the wireless acquisition equalization board of the single battery cell that is discharging or charging.

[0025] Further, the equalization start condition is:

[0026] V max -V min ≥V 设

[0027] Wherein, V max is the voltage value of the single battery cell with the maximum voltage in the battery pack, V min is the voltage value of the single battery cell with the minimum voltage in the battery pack, V 设 is the set equalization threshold;

[0028] The equalization stop condition is:

[0029] V max -V min ≤V stp

[0030] Wherein, Vstp is the balancing termination threshold.

[0031] According to the specific embodiments provided by the present invention, the wireless balancing control system and method for the battery cells in the energy storage battery pack provided by the present invention disclose the following technical effects:

[0032] The wireless balancing control system for the battery cells in the energy storage battery pack includes a balancing control board and a wireless acquisition and balancing board. The wireless acquisition and balancing board has functions such as sampling, storage, control, wireless communication, radio frequency energy transmission, and radio frequency energy reception. A wireless acquisition and balancing board is installed on each single battery cell. The wireless acquisition and balancing board and the balancing control board communicate at a high rate wirelessly. The balancing control board monitors the states of each single battery cell, such as voltage, current, and power, and dynamically controls the switch states of the radio frequency transmission module and the radio frequency reception module of the wireless acquisition and balancing board of each single battery cell according to the real-time data, and transfers the energy of the single battery cell with a higher power to the single battery cell with a lower power. The balancing control board starts the wireless balancing process as needed to adjust the rate and direction of energy transfer, ensuring that each single battery cell in the battery pack is in the best state.

[0033] The present invention can realize wireless energy transfer between the single battery cells in the battery pack, simplify the internal structure of the battery pack, reduce the manufacturing cost, reduce the risks of short circuit, fire, and thermal runaway, and improve the balancing efficiency and safety of the battery cells in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 is a schematic structural diagram of the wireless balancing control system for the battery cells in the energy storage battery pack according to the embodiment of the present invention;

[0036] Figure 2 is a schematic installation diagram of the wireless acquisition and balancing board on the single battery cell according to the embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of the internal battery cell balancing system in the prior art;

[0038] Figure 4 is a schematic functional diagram of the wireless acquisition and balancing board according to the embodiment of the present invention;

[0039] Figure 5 is a schematic functional diagram of the balancing control board according to the embodiment of the present invention;

[0040] Figure 6Schematic diagram of the wireless equalization control method for the battery cells in the energy storage battery pack according to the embodiment of the present invention;

[0041] Reference numerals: 1, battery pack; 2, single battery cell; 3, first insulating housing; 4, wireless acquisition and equalization board; 5, equalization control board; 6, second insulating housing; 7, battery cell terminal; 8, reserved hole; 9, wire. Detailed implementation manners

[0042] The technical solutions in 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. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] As Figure 3 shown, custom wiring harnesses are configured inside the existing energy storage battery pack and electric vehicle battery pack. One end of the wiring harness is connected to the single battery cell, and the other end of the wiring harness is connected to the battery cell data sampling board to realize the acquisition and judgment of the data of the single battery cell. Through software algorithms, the battery cells with too large energy differences are passively equalized by consuming energy through resistors for the battery cells with high energy, so as to ensure the voltage consistency of the entire battery pack. It can be seen that in the existing technology, wires are pulled out from both poles of each battery cell to the control circuit board outside the battery pack, and the circuit structure is complex, posing a safety hazard.

[0044] Compared with the existing technology, the purpose of the present invention is to provide a wireless equalization control system and method for the battery cells in the energy storage battery pack, realizing wireless energy transmission between the single battery cells in the battery pack, simplifying the internal structure of the battery pack, reducing the manufacturing cost, reducing the risks of short circuit, fire and thermal runaway, and improving the equalization efficiency and safety of the battery cells in the battery pack.

[0045] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0046] As Figure 1 - Figure 2 、 Figure 4 - Figure 5As shown in the figure, the wireless equalization control system for the battery cells in the energy storage battery pack provided by the present invention includes a battery pack 1 and an equalization control board 5 disposed on the front panel of the battery pack 1. A plurality of series-connected single battery cells 2 are arranged in the battery pack 1, and a wireless acquisition and equalization board 4 is installed on each single battery cell 2. The wireless acquisition and equalization board 4 includes an acquisition and equalization controller, a battery cell data acquisition module, a first wireless communication module, a radio frequency transmission module, and a radio frequency reception module that are electrically connected to the acquisition and equalization controller. The battery cell data acquisition module is electrically connected to the single battery cell and is used for acquiring battery cell data (such as the voltage, current, temperature, etc. of the single battery cell 2). The radio frequency transmission module is used for converting the power of the single battery cell where it is located into a radio frequency signal and transmitting it to other single battery cells. The radio frequency reception module is used for receiving the radio frequency signals emitted by the radio frequency transmission modules of other single battery cells;

[0047] The equalization control board 5 includes a battery pack equalization controller and a second wireless communication module that is electrically connected to the battery pack equalization controller. The second wireless communication module is wirelessly communicatively connected to the first wireless communication module; the wireless acquisition and equalization board receives the charging or discharging instructions issued by the equalization control board, and controls the operation of the radio frequency reception module or the radio frequency transmission module to perform the power equalization control between different single battery cells, ensuring that each single battery cell maintains the best state of charge.

[0048] The outside of the wireless acquisition and equalization board 4 is covered with a first insulating housing 3. A reserved hole 8 is provided on the first insulating housing 3. The wireless acquisition and equalization board 3 is connected to the positive and negative electrodes (i.e., the battery cell terminals 7) of the single battery cell through a wire 9. The wire 9 passes through the reserved hole 8, and the single battery cell 2 supplies power to the wireless acquisition and equalization board 4. The electric energy required for the normal operation of the wireless acquisition and equalization board 4 is provided by the single battery cell 2 without an external power source.

[0049] The equalization control board 5 is located inside the battery pack 1, and the outside of the equalization control board 5 is covered with a second insulating housing 6. The equalization control board 5 further includes a second storage module connected to the battery pack equalization controller, and an external communication interface, an external power supply interface, and a display module connected to the battery pack equalization controller.

[0050] The second insulating housing 6 is provided with a fixing bracket, and the battery pack housing is reserved with holes corresponding to and matching the fixing bracket, and it can be fixed to the battery pack housing using screws.

[0051] The above-mentioned battery pack equalization controller can adopt a microcontroller (MCU) and combine an equalization control algorithm to realize the power equalization control between multiple single battery cells 2 in the battery pack. The MCU is responsible for acquiring the state information of the battery pack (including the voltage, current, temperature, etc. of each single battery cell 2), and determining the charging and discharging instructions through the built-in equalization control algorithm.

[0052] Both the first wireless communication module and the second wireless communication module adopt Zigbee communication modules. Zigbee is a wireless communication method with low power consumption, low cost, and low complexity. It can form a one-to-many network, facilitating the control of the equalization control board 5 over multiple wireless acquisition equalization boards 4.

[0053] The wireless acquisition equalization board 4 further includes a first storage module connected to the acquisition equalization controller. The cell data acquisition module includes a variety of sensors and an analog-to-digital converter connected to the sensors. The variety of sensors include voltage, current, and temperature sensors, which are respectively used to collect the voltage, current, and temperature of the single cell. The analog-to-digital converter is electrically connected to the acquisition equalization controller. The cell data acquisition module further includes a protection circuit. The sensors are used to directly obtain the cell data of the single cell 2, the analog-to-digital converter is used to convert analog signals such as voltage and temperature into digital signals, and the protection circuit performs overvoltage, overcurrent, and short-circuit protection on the single cell 2 to ensure the safety of the cell. The first wireless communication module uses Zigbee wireless networking for communication. The acquisition equalization controller uses a ZigBee 2.4G chip, which is designed with low power consumption. The built-in microprocessor can process and analyze the received data and perform corresponding operations according to the processing results. The acquisition equalization controller controls the activation and deactivation of the radio frequency transmission module and the radio frequency reception module.

[0054] The radio frequency transmission module includes a radio frequency oscillator, a radio frequency amplifier, and a transmitting antenna. After the wireless acquisition equalization board receives the discharge instruction sent by the equalization control board, the acquisition equalization controller controls the radio frequency oscillator to generate a radio frequency signal. The radio frequency signal is amplified by the radio frequency amplifier and then transmitted through the transmitting antenna to achieve the discharge of the single cell.

[0055] The radio frequency reception module includes a receiving antenna, an impedance matching circuit, a rectifying circuit, and a voltage stabilizing circuit. When the wireless acquisition equalization board receives the charging instruction sent by the equalization control board, the acquisition equalization controller controls the receiving antenna to receive the radio frequency signal. After the radio frequency signal undergoes impedance matching by the impedance matching circuit, rectification by the rectifying circuit, and voltage stabilization by the voltage stabilizing circuit, it charges the single cell.

[0056] The transmitting antenna and the receiving antenna are printed and integrated on the wireless acquisition equalization board 4. The wireless acquisition equalization board 4 is placed in a first insulating housing 3 with a shape and size matching the module to prevent it from directly contacting the single cell and other metal components, thus avoiding current leakage and short circuits. The upper part of the first insulating housing 3 is not sealed, and heat dissipation is carried out through natural cooling. The wire 9 between the wireless acquisition equalization board 4 and the single cell 2 passes through the reserved hole 8 on the first insulating housing 3 and is welded to the cell poles 7 at both ends to sample and equalize the control of the single cell 2.

[0057] The wireless acquisition and equalization board 4 will be activated when it detects the activation signal sent by the equalization control board 5. After the equalization control board 5 encodes the wireless acquisition and equalization board 4, the wireless acquisition and equalization board 4 starts to collect the cell data and transmits it to the equalization control board 5. The equalization control board 5 detects and analyzes the cell data to determine whether the equalization start condition is met, and then issues a charge / discharge command to the wireless acquisition and equalization board 4 to perform equalization control on the single cell 2.

[0058] As Figure 6 shown, the present invention also discloses a wireless equalization control method for cells in a energy storage battery pack, which is applied to the wireless equalization control system for cells in the above-mentioned energy storage battery pack, and includes the following steps:

[0059] System initialization, setting the equalization threshold;

[0060] The equalization control board starts to work and sends an activation signal for the wireless acquisition and equalization board to each single cell;

[0061] After the wireless acquisition and equalization boards of each single cell feedback the activation signal, the cell data acquisition module collects the cell data of the cell monomers in real time and uploads it to the equalization control board;

[0062] Based on the cell data of each cell monomer in the battery pack, the equalization control board determines whether the cell voltage difference in the battery pack reaches the equalization start condition; the equalization start condition is:

[0063] V max -V min ≥V 设

[0064] Among them, V max is the voltage value of the single cell with the largest voltage in the battery pack, V min is the voltage value of the single cell with the smallest voltage in the battery pack, V 设 is the set equalization threshold; for example, the set equalization threshold is 50 mV. When the voltage difference between any two single cells in the battery pack exceeds 50 mV, the equalization control board of the battery pack sends an equalization start command to the wireless acquisition and equalization boards of these two cells to start equalization control;

[0065] If so, the equalization control board sends a discharge command to the wireless acquisition and equalization board of the single cell with the largest voltage in the battery pack, and sends a charge command to the wireless acquisition and equalization board of the single cell with the smallest voltage in the battery pack;

[0066] The wireless acquisition and equalization board of the single cell with the largest voltage controls the radio frequency transmitting module connected to it to emit a radio frequency signal for discharging; the wireless acquisition and equalization board of the single cell with the smallest voltage controls the radio frequency receiving module connected to it to receive the radio frequency signal for charging;

[0067] The equalization control board determines whether the voltage difference between the battery cells in the battery pack reaches the equalization termination condition based on the cell data of each individual battery cell in the battery pack; the equalization termination condition is:

[0068] V max -V min ≤V stp

[0069] where V stp is the equalization termination threshold. For example, if the equalization termination threshold is set to 10 mV, when the voltage difference between the battery cells drops below 10 mV, the equalization control board of the battery pack sends a stop equalization command to the wireless acquisition equalization board of the battery cell that is discharging or charging, and stops the equalization.

[0070] If so, the equalization control board sends a stop equalization command to the wireless acquisition equalization board of the individual battery cell that is discharging or charging. The wireless acquisition equalization board of the individual battery cell that is discharging or charging controls the corresponding radio frequency transmitting module or radio frequency receiving module to stop working.

[0071] In the above control method, if the charging individual battery cell and the discharging individual battery cell are not adjacent, the output power of the radio frequency signal can be dynamically adjusted according to the position of the charging individual battery cell to maintain the best energy transmission.

[0072] The communication signal and the radio frequency signal of the wireless acquisition equalization board adopt wireless communication signals with different frequencies to reduce co-frequency interference. A filtering circuit can be added to the radio frequency receiving module for filtering to reduce signal interference and further improve the signal reception quality.

[0073] The present invention discloses a wireless equalization control method for internal battery cells of a battery pack based on RF wireless radio frequency technology for transmitting electric energy. In the present invention, a wireless acquisition equalization module is installed on each individual battery cell inside the battery pack. The equalization control and protection board controls the equalization modules on each individual battery cell to transfer energy from the high-energy battery to the low-energy battery, thereby realizing the uniform distribution of energy inside the battery pack, which can simplify the internal wiring harness structure of the battery pack and reduce the risks of short circuit, fire and thermal runaway. Compared with the sampling equalization wiring harness used in the current battery pack, the main advantages of the wireless equalization control method for internal battery cells of the battery pack proposed by the present invention are as follows:

[0074] (1) It can accurately control the charging and discharging processes of each individual battery cell, which is beneficial to maintaining the consistency between the battery cells in the battery pack and extending the service life of the battery pack;

[0075] (2) Wireless equalization does not require physically connecting the lead wires of each individual battery, reducing the use of cables and connectors, lowering the material cost and simplifying the internal structure of the battery pack;

[0076] (3) Wide application scenarios, especially suitable for environments with limited space or difficult cable layout;

[0077] (4) Easy to expand, can easily increase or decrease the number of monitored and balanced batteries as needed, facilitating adaptation to battery packs of different scales and configurations;

[0078] (5) Can monitor the status of each single cell in the battery pack in real time and achieve automatic balancing management, improving the safety and reliability of the battery pack.

[0079] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A wireless equalization control system for battery cells in an energy storage battery pack, comprising a battery pack and an equalization control board arranged on the front panel of the battery pack. A plurality of series-connected single battery cells are arranged in the battery pack, and it is characterized in that, A wireless acquisition and equalization board is installed on each single-cell battery. The wireless acquisition and equalization board includes an acquisition and equalization controller, a battery cell data acquisition module, a first wireless communication module, a radio frequency transmission module, and a radio frequency reception module that are electrically connected to the acquisition and equalization controller. The battery cell data acquisition module is electrically connected to the single-cell battery and is used to acquire battery cell data. The radio frequency transmission module is used to convert the power of the single-cell battery where it is located into a radio frequency signal and transmit it to other single-cell batteries. The radio frequency reception module is used to receive the radio frequency signals emitted by the radio frequency transmission modules of other single-cell batteries. The equalization control board includes a battery pack equalization controller and a second wireless communication module that is electrically connected to the battery pack equalization controller. The second wireless communication module is wirelessly connected to the first wireless communication module. The wireless acquisition and equalization board receives the charging or discharging instructions sent by the equalization control board and controls the operation of the radio frequency reception module or the radio frequency transmission module to perform power equalization control between different single-cell batteries.

2. The wireless equalization control system for battery cells in the energy storage battery pack according to claim 1, wherein The outside of the wireless acquisition and equalization board is covered with a first insulating housing. A reserved hole is provided on the first insulating housing. The positive and negative electrodes of the wireless acquisition and equalization board and the single-cell battery are connected by wires, and the wires pass through the reserved hole. The single-cell battery supplies power to the wireless acquisition and equalization board.

3. The wireless equalization control system for battery cells in the energy storage battery pack according to claim 1, characterized in that, The equalization control board is located inside the battery pack, and the outside of the equalization control board is covered with a second insulating housing.

4. The wireless equalization control system for battery cells in the energy storage battery pack according to claim 1, wherein The wireless acquisition and equalization board further includes a first storage module connected to the acquisition and equalization controller, and the equalization control board further includes a second storage module connected to the battery pack equalization controller.

5. The wireless equalization control system for battery cells in the energy storage battery pack according to claim 1, wherein, The equalization control board further includes an external communication interface, an external power supply interface, and a display module connected to the battery pack equalization controller.

6. The wireless equalization control system for battery cells in the energy storage battery pack according to claim 1, characterized in that Both the first wireless communication module and the second wireless communication module adopt Zigbee communication modules.

7. The wireless equalization control system for battery cells in the energy storage battery pack according to claim 1, wherein The battery cell data acquisition module includes a variety of sensors and an analog-to-digital converter connected to the sensors. The variety of sensors include voltage, current, and temperature sensors, which are respectively used to acquire the voltage, current, and temperature of the single-cell battery. The analog-to-digital converter is electrically connected to the acquisition and equalization controller.

8. The wireless equalization control system for battery cells in the energy storage battery pack according to claim 1, wherein The radio frequency transmission module includes a radio frequency oscillator, a radio frequency amplifier, and a transmitting antenna. After the wireless acquisition and equalization board receives the discharging instruction sent by the equalization control board, the acquisition and equalization controller controls the radio frequency oscillator to generate a radio frequency signal. The radio frequency signal is amplified by the radio frequency amplifier and then transmitted through the transmitting antenna to realize the discharging of the single-cell battery. The radio frequency reception module includes a receiving antenna, an impedance matching circuit, a rectifying circuit, and a voltage stabilizing circuit. When the wireless acquisition and equalization board receives the charging instruction sent by the equalization control board, the acquisition and equalization controller controls the receiving antenna to receive the radio frequency signal. After the radio frequency signal undergoes impedance matching by the impedance matching circuit, rectification by the rectifying circuit, and voltage stabilization by the voltage stabilizing circuit, it charges the single-cell battery.

9. A wireless equalization control method for battery cells in an energy storage battery pack, which is applied to the wireless equalization control system for battery cells in the energy storage battery pack according to any one of claims 1-8, characterized in that, It includes the following steps: System initialization, setting the equalization threshold; The equalization control board starts to work and sends a wireless acquisition and equalization board activation signal to each single-cell battery; After the wireless acquisition and equalization board of each single cell core feeds back the activation signal, the cell core data acquisition module collects the cell core data of each single cell core in real time and uploads it to the equalization control board; Based on the cell core data of each single cell core in the battery pack, the equalization control board determines whether the cell core voltage difference in the battery pack reaches the equalization start condition; If so, the equalization control board sends a discharge instruction to the wireless acquisition and equalization board of the single cell core with the maximum voltage in the battery pack, and sends a charge instruction to the wireless acquisition and equalization board of the single cell core with the minimum voltage in the battery pack; The wireless acquisition and equalization board of the single cell core with the maximum voltage controls the connected radio frequency transmission module to emit radio frequency signals for discharging; the wireless acquisition and equalization board of the single cell core with the minimum voltage controls the connected radio frequency reception module to receive radio frequency signals for charging; Based on the cell core data of each single cell core in the battery pack, the equalization control board determines whether the cell core voltage difference in the battery pack reaches the equalization stop condition; If so, the equalization control board sends a stop equalization instruction to the wireless acquisition and equalization board of the single cell core that is discharging or charging.

10. The method for wireless equalization control of battery cells in an energy storage battery pack according to claim 9, wherein The equalization start condition is: V max -V min ≥V 设 Among them, V max is the voltage value of the single cell with the maximum voltage in the battery pack, V min is the voltage value of the single cell with the minimum voltage in the battery pack, V 设 is the set balancing threshold; The equalization stop condition is: V max -V min ≤V stp Among them, V stp is the equilibrium termination threshold.

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