CN114301126A - Battery cell balancing system and method of electrochemical energy storage system - Google Patents
Battery cell balancing system and method of electrochemical energy storage system Download PDFInfo
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Abstract
A cell equalization system and method of an electrochemical energy storage system, the method realizes real-time monitoring, SOC evaluation and equalization control of cell voltage in each energy storage system through a cell equalization control module, an equalization energy bus provides a uniform channel for equalization energy transfer between different cells, an equalization execution module realizes data acquisition of voltage and temperature of the cells, a group of power electronic switches in the equalization execution module are connected with the cells and used for switching on and off the cells to be equalized, a DC/DC module controls charging and discharging of the currently selected cells to be equalized, energy transfer is realized by accurate acquisition of cell voltage and accurate control of low charging and high discharging of the cells, inconsistency of electric quantity and SOC of the cells is reduced, a low-cost and high-efficiency equalization control technology is realized, over-charging or over-discharging of batteries is avoided, the cycle life of the batteries is prolonged, and the effective charging and discharging capacity of energy storage power stations is improved, and the electricity cost of the energy storage power station (LCOE) is reduced.
Description
Technical Field
The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a method for balancing a battery cell of an electrochemical energy storage system.
Background
In the operation process of the electrochemical energy storage power station, due to the influence of factors such as battery manufacturing process, operation environment and the like, inconsistency is gradually generated between battery cores and between modules, so that the voltage, the electric quantity or the SOC of partial monomers are higher or lower, in order to avoid series safety problems caused by overcharge and overdischarge of the battery monomers, charging and discharging operations must be carried out in the same cluster of strings in the interval of the maximum voltage, the minimum voltage and the electric quantity (SOC) of each battery core in all the batteries, a short plate effect is formed, the system cannot be fully charged and discharged, and the effective capacity and the service life of the power station are influenced in the past.
In order to solve the problem, a passive equalization technology is often adopted, a single battery cell is connected with a power electronic switch and a resistor in parallel, when the voltage (electric quantity) or the SOC of a certain battery cell in a certain group is monitored to be obviously higher than that of other battery cells (for example, the voltage is higher than 50 mV), the equalization switch is conducted, and the discharge is continuously carried out through small current, so that the difference with other battery cells is reduced.
The other solution is to use an active equalization technique to transfer the high-power battery energy to the low-power battery through a power electronic switch and a capacitive or inductive device.
The main passive equalization scheme directly converts redundant electric quantity into heat to be released through a circuit, has the characteristics of simple principle, small equalization current and low cost, but has energy loss in the equalization process, brings extra heat release, cannot balance individual lagging electric cores and other defects, and cannot completely eliminate the short plate effect. And the active equalization management granularity of the module level is coarse, so that the problem of electric quantity equalization of the battery core level cannot be solved.
Therefore, the applicant provides a low-cost cell-level active equalization method, which can effectively solve the limitation of the existing 2 equalization technologies, support cell-level active equalization, has the characteristics of low cost, high energy efficiency and the like, and has a great popularization value.
Disclosure of Invention
The invention aims to provide a cell balancing method of an electrochemical energy storage system, which can efficiently transfer the energy of a cell with higher electric quantity or SOC to a cell with lower electric quantity or SOC, can furthest improve the DOD level of the energy storage system, and can improve the capacity retention rate of the system, thereby obviously prolonging the cycle life of the system.
A cell balancing system of an electrochemical energy storage system comprises a cell balancing terminal, wherein the cell balancing terminal is respectively connected with a cell balancing control module and a balancing energy bus;
the battery cell balancing terminal comprises a balancing execution module, and the balancing execution module comprises at least 1 group of electric quantity monitoring module, a power electronic switch and a DC/DC module; the electric quantity monitoring module is used for monitoring the voltage of each battery cell and feeding the voltage back to the balance control module in real time, and the balance control module controls the power electronic switch to realize the disconnection of any battery cell;
the DC/DC module is respectively connected with the power electronic switch and the electric quantity equalization bus, and the high-electric-quantity battery cell can be connected to the equalization energy bus for discharging after being boosted by the equalization control module, or the low-electric-quantity battery cell can be charged after the voltage in the equalization energy bus is reduced by the equalization control module.
The balance energy bus is a power bus connected among balance execution modules in each battery cell balance terminal, and battery cells with overhigh voltage/electric quantity discharge to release energy into the balance energy bus; the battery cells with too low voltage/electric quantity acquire energy from the bus to charge, so that energy balance among the battery cells is realized, the same bus can support a plurality of balance execution modules to discharge or charge simultaneously, arrangement of electric cables can be greatly reduced, and the efficiency of electric quantity balance is improved.
The battery cell balancing terminal further comprises a first power supply, and the first power supply supplies power to the balancing execution module.
The battery cell balance control module comprises a battery cell state analysis module and a control module, wherein the battery cell state analysis module can acquire the voltage state of a battery cell in a module collected by each balance execution module and calculate the electric quantity and SOC of the battery cell; the control module can issue a balancing instruction to the balancing execution module according to the balancing strategy, monitor the balancing process and evaluate the balancing effect.
The battery cell balance control module further comprises a second power supply module, and the second power supply module provides a power supply for the battery cell balance control module.
The method for balancing the electrochemical energy storage battery cell realizes monitoring and balancing control of each battery system through a battery cell balancing control module, realizes data acquisition of voltage and temperature of the battery cell through a balancing execution module, realizes charging and discharging of the battery cell through a power electronic switch and a DC/DC module, meets the requirement of battery cell balancing through an independent low-voltage and low-current charging and discharging switch control circuit, and reduces implementation cost.
The method specifically comprises the following steps:
1) selecting a battery cell balancing terminal with a proper specification, and monitoring and balancing control over a target battery cell through a balancing execution module in the battery cell balancing terminal;
2) the real-time voltage state of each battery cell is collected through an electric quantity monitoring module in the battery cell balancing terminal, and the collected voltage data is sent to a battery cell balancing control module;
3) calculating and analyzing the collected real-time and historical voltage data of each battery cell by a battery cell state analysis module in the battery cell balance control module to obtain an SOC value of each battery cell, and further analyzing the voltage of each battery cell;
4) a control module in the battery cell balance control module establishes a balance control strategy, the deviation of the voltage and the SOC of each battery cell exceeds a certain range, and the balance strategy can be executed and comprises a discharging strategy and a charging strategy;
5) determining the cells participating in the balancing at this time by obtaining the cells with larger voltage and SOC deviations obtained by analysis, wherein the cells comprise the cells participating in discharging and the cells participating in charging, and sending a cell balancing control instruction to a balancing execution module, wherein the cell balancing control instruction comprises three types of executing charging, executing discharging and stopping;
6) after receiving the balance control instruction of the cell balance control module, the balance execution module executes the action of the power electronic switch corresponding to the cell to connect or disconnect the power electronic switch, and before a certain power electronic switch in the same group is connected, other power electronic switches in the group are disconnected to ensure that at most one passage is connected;
7) the DC/DC module of the current equalization execution module acts and sets the state of the current equalization execution module working in power supply to the inside or discharging to the outside according to the difference of the charging and discharging control instructions; if the command is a stop command, directly disconnecting the balanced energy bus;
8) in a high-electricity cell charging mode, after the operation is finished, the balance execution module acquires energy from the balance energy bus (3), and the DC/DC module is used for reducing the voltage of 12V or 24V in the balance energy bus and then charging the specified cell;
9) if the high-electricity-quantity battery cell is in discharging operation, after the operation is completed, the equalization execution module boosts the electricity quantity of the specified battery cell to 12V or 24V through the DC/DC module and releases the electricity quantity into the equalization energy bus.
The equalization execution module monitors the temperature of the battery cell and the equalization execution module in real time, and if the temperature of the battery cell or the equalization execution module exceeds a set value, the operation of the equalization execution module is stopped, so that the system safety is ensured;
the balance execution module reports real-time charging and discharging states and current data to the battery cell balance control module, the battery cell balance control module analyzes the voltage, the SOC state and the accumulated charging and discharging electric quantity of the battery cell in real time, the balance action of the battery cell is dynamically analyzed and controlled, and overcharge or overdischarge of the battery cell is avoided.
The equalization system does not directly participate in or control the charging and discharging processes of the energy storage system, but needs to judge relevant strategies according to the charging and discharging states of the energy storage system, so that accurate and reasonable equalization operation of the battery cell is ensured, the service life of the system is verified, and the safety of the system is ensured.
The balance energy bus can be connected with 12V or 24V power supply circuits of the cell balance control module and the balance execution module, energy is provided for a secondary system through high-voltage SOC cell discharge or energy is obtained from the secondary system to be low-voltage SOC cell electricity compensation, and electric quantity balance among the cells is achieved, so that the utilization rate of electric quantity and the balance control capacity of the system are further improved.
Compared with the prior art, the invention has the following technical effects:
the average electricity cost (LCOE) of the energy storage power station is a core factor determining the efficiency of the power station, and the capacity retention rate and the cycle life of the battery cell and the system are the key factors for reducing the LCOE. The cell active equalization technology and the device provided by the invention can efficiently transfer the energy of the cell with higher electric quantity or SOC to the cell with lower electric quantity or SOC, can furthest improve the DOD level of an energy storage system, and improve the capacity retention rate of the system, thereby obviously prolonging the cycle life of the system and reducing the LCOE of the system.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIGS. 1 and 2 are block diagrams of the present invention;
fig. 3 is a circuit diagram of a dc battery system.
Detailed Description
As shown in fig. 1 and 2, a cell balancing system of an electrochemical energy storage system includes a cell balancing terminal 1, where the cell balancing terminal 1 is connected to a cell balancing control module 2 and a balancing energy bus 3, respectively;
the battery cell balancing terminal 1 comprises a balancing execution module, and the balancing execution module comprises at least 1 group of electric quantity monitoring modules 1-1, power electronic switches 1-2 and DC/DC modules 1-3; the electric quantity monitoring module 1-1 is used for monitoring the voltage of each electric core 4 and feeding the voltage back to the balance control module 2 in real time, and the balance control module 2 controls the power electronic switch 1-2 to realize the on-off of any electric core 4;
the DC/DC modules 1-3 are respectively connected with the power electronic switches 1-2 and the electric quantity equalization bus 3, and the equalization control module 2 can be used for boosting the high-electric quantity battery cell 4 and then connecting the high-electric quantity battery cell to the equalization energy bus 3 for discharging, or the equalization control module 2 can be used for reducing the voltage in the equalization energy bus 3 and then charging the low-electric quantity battery cell 4.
The balance energy bus 3 is a power bus connected among balance execution modules in each cell balance terminal 1, and a cell with overhigh voltage/electric quantity discharges to release energy into the balance energy bus; the battery cells with too low voltage/electric quantity acquire energy from the bus to charge, so that energy balance among the battery cells is realized, the same bus can support a plurality of balance execution modules to discharge or charge simultaneously, arrangement of electric cables can be greatly reduced, and the efficiency of electric quantity balance is improved.
The battery cell balancing terminal 1 further comprises a first power supply 1-4, and the first power supply 1-4 supplies power to the balancing execution module.
The cell balance control module 2 comprises a cell state analysis module 2-1 and a control module 2-2, and the cell state analysis module 2-1 can acquire the voltage state of the cell in the module collected by each balance execution module and calculate the electric quantity of the cell and SOC and SOH values; the control module 2-2 can issue a balancing instruction to the balancing execution module according to the balancing strategy, monitor the balancing process and evaluate the balancing effect.
The battery cell balance control module 2 further comprises a second power module 2-3, and the second power module 2-3 provides power for the battery cell balance control module 2.
More specifically, the battery cell balancing terminal comprises a power supply and one or more groups of balancing execution modules, wherein each group of balancing execution modules comprises an electric quantity monitoring module, a power electronic switch and a DC/DC module; the power supply is 12V/24V and is responsible for supplying power to the execution module, and the module is provided with a plurality of groups of electric quantity monitoring modules and power electronic switches (4, 8 and 16 paths can be configured as a group as required and used as a minimum balancing unit) which are respectively connected with each battery cell;
the electric quantity monitoring module is responsible for acquiring the voltage of each battery cell and feeding the voltage back to the balance control module in real time; the power electronic switch can be used for realizing the on-off of the balance control of any one battery cell according to the instruction execution of the balance control module, and at most one battery cell can be communicated with one group of modules at a time for balancing;
a group of equalization execution modules comprises a DC/DC module, supports BUCK and BOOSTER circuits and isolation, is connected with a plurality of paths of power electronic switches and an electric quantity equalization bus, can boost a high-electric quantity electric core according to an instruction of the equalization control module and then connect the high-electric quantity electric core into the bus for discharging, and can also charge a low-electric quantity electric core after reducing the voltage in the bus according to the instruction of the equalization control module.
The electric quantity balancing bus is a power bus connected among the terminal execution modules, the electric core with overhigh voltage/electric quantity discharges to release energy to the bus, the electric core with overhigh voltage/electric quantity obtains energy from the bus to charge, and therefore energy balancing among the electric cores is achieved.
The balance control module comprises a power supply module, a cell state analysis module, a control module and the like. The power supply module is responsible for providing a power supply for the battery cell balance control module, the battery cell state analysis module is responsible for acquiring the voltage state of the battery cells in the module collected by each terminal execution module, calculating the electric quantity of the battery cells and the SOC and SOH values, and the control module is responsible for issuing a balance instruction to the terminal execution module according to a balance strategy, monitoring a balance process and evaluating a balance effect.
The method for balancing the electrochemical energy storage battery cell realizes monitoring and balancing control of each battery system through a battery cell balancing control module 2, realizes data acquisition of voltage and temperature of the battery cell 4 through a balancing execution module 1, realizes charging and discharging of the battery cell 4 through a power electronic switch 1-2 and a DC/DC module 1-3, meets the battery cell balancing requirement through an independent low-voltage and low-current charging and discharging switch control circuit, and reduces implementation cost.
The balancing strategy is specifically as follows:
1) selecting a battery cell balancing terminal 1 with a proper specification, and monitoring and balancing control over a target battery cell through a balancing execution module in the battery cell balancing terminal 1; specifically, according to different specifications of battery modules (PACKs) of an electrochemical energy storage system, the number of series-parallel connection of battery cells in the modules is different, battery cell balancing terminals with different specifications are adopted, each battery cell balancing terminal comprises 1 or more groups of balancing execution modules, and each execution module supports monitoring and balancing control of 4, 8, 16 paths of different battery cells and the like;
2) the real-time voltage state of each battery cell is collected through an electric quantity monitoring module 1-1 in the battery cell balancing terminal 1, and collected voltage data are sent to a battery cell balancing control module 2; specifically, the electric quantity monitoring module in the equalization execution module supports multi-path voltage acquisition (for example, 4 paths, 8 paths or 16 paths, which are a group of minimum equalization units), realizes the real-time voltage state acquisition of each battery cell in the energy storage system, and sends the acquired voltage data to the battery cell equalization control module;
3) calculating and analyzing the collected real-time and historical voltage data of each battery cell by a battery cell state analysis module 2-1 in the battery cell balance control module 2 to obtain an SOC value of each battery cell and further obtain battery cell data for analyzing higher and lower voltages or higher and lower SOC;
4) a control module 2-2 in the battery cell balance control module 2 establishes a balance control strategy, the voltage and SOC deviation of each battery cell exceeds a certain range, and the balance strategy can be executed and comprises a discharging strategy and a charging strategy; specifically, a control module in the cell balancing control module establishes a balancing control strategy, and the voltage and SOC deviation of each cell in the monitoring module or among the modules exceeds a certain range (for example, the voltage difference exceeds 50mV or the SOC value exceeds 10%), and can execute the balancing strategy, including a discharging strategy and a charging strategy; (only one high-power battery cell or low-power battery cell can be selected for operation at one time in the same group in the module, only 1 battery cell can be charged or discharged, but the groups in the same module and the whole equalization system simultaneously support multiple groups to be charged or discharged simultaneously);
5) determining the cells participating in the balancing at this time by obtaining the cells with larger voltage and SOC deviations obtained by analysis, wherein the cells comprise the cells participating in discharging and the cells participating in charging, and sending a cell balancing control instruction to a balancing execution module, wherein the cell balancing control instruction comprises three types of executing charging, executing discharging and stopping;
6) after receiving the balance control instruction of the cell balance control module 2, the balance execution module executes the action of the power electronic switch corresponding to the cell to connect or disconnect the power electronic switches, and before a certain power electronic switch in the same group is connected, other power electronic switches in the group are disconnected to ensure that at most one channel is connected;
7) the DC/DC module 1-3 of the current equalization execution module acts, and the state that the current equalization execution module works in power supply to the inside or discharge to the outside is set according to the difference of the charging and discharging control instructions; if the command is a stop command, directly disconnecting the balanced energy bus;
8) in a high-electricity-quantity cell charging mode, after the operation is finished, the balance execution module acquires energy from the bus, and the 12V or 24V voltage in the electricity balance bus is reduced through the DC/DC Buck circuit to charge the specified cell;
9) if the high-electricity-quantity battery cell is in discharging operation, after the operation is finished, the balance execution module boosts the electricity quantity of the specified battery cell to 12V or 24V through a DC/DC Booster circuit and releases the electricity quantity to an electricity quantity balance bus;
the equalizing circuit has the functions of isolation and bidirectional current control, and overvoltage, overcharge and overdischarge of the battery cell in the equalizing process are avoided.
The balance execution module monitors the temperature of the battery cell 4 and the balance execution module in real time, and if the temperature of the battery cell or the balance execution module exceeds a set value, the operation of the balance execution module is stopped, so that the system safety is ensured;
the balance execution module reports real-time charging and discharging states and current data to the battery cell balance control module 2, the battery cell balance control module 2 analyzes the voltage, the SOC state and the accumulated charging and discharging electric quantity of the battery cell in real time, and dynamically analyzes and controls the balance action of the battery cell, so that the battery cell is prevented from being overcharged or overdischarged.
The equalization system does not directly participate in or control the charging and discharging processes of the energy storage system, but needs to judge relevant strategies according to the charging and discharging states of the energy storage system, so that the battery cell equalization operation is accurate and reasonable, the service life of the system is verified, and the system safety is ensured.
The balance energy bus 3 can be connected with the 12V or 24V power supply circuit of the cell balance control module 2 and the balance execution module, energy is provided for a secondary system through high-voltage SOC cell discharge or electric quantity balance among the cells is realized through obtaining energy from the secondary system to be low-voltage SOC cell electricity compensation, and therefore the utilization rate of the electric quantity and the balance control capability of the system are further improved.
Claims (8)
1. A battery cell balancing system of an electrochemical energy storage system is characterized by comprising a battery cell balancing terminal (1), wherein the battery cell balancing terminal (1) is respectively connected with a battery cell balancing control module (2) and a balancing energy bus (3);
the battery cell balancing terminal (1) comprises a balancing execution module, and the balancing execution module comprises at least 1 group of electric quantity monitoring modules (1-1), power electronic switches (1-2) and DC/DC modules (1-3); the electric quantity monitoring module (1-1) is used for monitoring the voltage of each electric core (4) and feeding the voltage back to the balance control module (2) in real time, and the balance control module (2) controls the power electronic switch (1-2) to realize the on-off of any electric core (4);
the DC/DC module (1-3) is respectively connected with the power electronic switch (1-2) and the electric quantity equalization bus (3), and the high-electric-quantity battery cell (4) can be boosted by the equalization control module (2) and then connected to the equalization energy bus (3) for discharging, or the voltage in the equalization energy bus (3) is reduced by the equalization control module (2) and then the low-electric-quantity battery cell (4) is charged.
2. The system according to claim 1, characterized in that the equalization energy bus (3) is a power bus connected between equalization execution modules in the respective cell equalization terminals (1), into which the cell discharges with too high voltage/charge release energy; the battery cells with too low voltage/electric quantity acquire energy from the bus to charge, so that energy balance among the battery cells is realized, the same bus can support a plurality of balance execution modules to discharge or charge simultaneously, arrangement of electric cables can be greatly reduced, and the efficiency of electric quantity balance is improved.
3. The system according to claim 1, wherein the cell balancing terminal (1) further comprises a first power supply (1-4), and the first power supply (1-4) supplies power to the balancing execution module.
4. The system according to claim 1, wherein the cell balancing control module (2) comprises a cell state analysis module (2-1) and a control module (2-2), and the cell state analysis module (2-1) can acquire the voltage state of the cells in the module, which is acquired by each balancing execution module, and calculate the electric quantity of the cells and the SOC and SOH values; the control module (2-2) can issue a balance instruction to the balance execution module according to the balance strategy, monitor the balance process and evaluate the balance effect.
5. The system according to claim 4, characterized in that the cell balancing control module (2) further comprises a second power supply module (2-3), and the second power supply module (2-3) supplies power to the cell balancing control module (2).
6. The method is characterized in that monitoring and balance control of each battery system are achieved through a battery cell balance control module (2), data collection of voltage and temperature of a battery cell (4) is achieved through a balance execution module (1), charging and discharging of the battery cell (4) are achieved through a power electronic switch (1-2) and a DC/DC module (1-3), the battery cell balance requirements are met through an independent low-voltage and low-current charging and discharging switch control circuit, and implementation cost is reduced.
7. The method according to claim 6, characterized in that it comprises in particular the steps of:
1) selecting a battery cell balancing terminal (1) with a proper specification, and monitoring and balancing control is performed on a target battery cell through a balancing execution module in the battery cell balancing terminal (1);
2) the real-time voltage state of each battery cell is collected through an electric quantity monitoring module (1-1) in the battery cell balancing terminal (1), and collected voltage data are sent to a battery cell balancing control module (2);
3) calculating and analyzing the collected real-time and historical voltage data of each battery cell by a battery cell state analysis module (2-1) in the battery cell balance control module (2) to obtain an SOC value of each battery cell and further analyze the voltage of each battery cell;
4) a control module (2-2) in the battery cell balance control module (2) establishes a balance control strategy, the deviation of the voltage and the SOC of each battery cell exceeds a certain range, and the balance strategy can be executed and comprises a discharging strategy and a charging strategy;
5) determining the cells participating in the balancing at this time by obtaining the cells with larger voltage and SOC deviations obtained by analysis, wherein the cells comprise the cells participating in discharging and the cells participating in charging, and sending a cell balancing control instruction to a balancing execution module, wherein the cell balancing control instruction comprises three types of executing charging, executing discharging and stopping;
6) after receiving the balance control instruction of the battery cell balance control module (2), the balance execution module executes the action of the power electronic switch of the corresponding battery cell to connect or disconnect the power electronic switch, and before a certain power electronic switch in the same group is connected, other power electronic switches in the group are disconnected to ensure that at most one passage is connected;
7) the DC/DC module (1-3) of the current equalization execution module acts, and the state that the current equalization execution module works in power supply to the inside or discharge to the outside is set according to the difference of the charging and discharging control instructions; if the command is a stop command, directly disconnecting the balanced energy bus;
8) in a high-electricity-quantity battery cell charging mode, after the operation is finished, the balance execution module acquires energy from the balance energy bus (3), and the DC/DC module (1-3) is used for reducing the voltage of 12V or 24V in the balance energy bus (3) and then charging the specified battery cell;
9) if the high-electricity-quantity battery cell is in discharging operation, after the operation is completed, the equalization execution module boosts the electricity quantity of the specified battery cell to 12V or 24V through the DC/DC modules (1-3) and releases the electricity quantity into the equalization energy bus.
8. The method according to claim 7, wherein the equalization execution module monitors the temperature of the battery cell (4) and the equalization execution module in real time, and if the temperature of the battery cell or the equalization execution module exceeds a set value, the operation of the equalization execution module is stopped, so that the system safety is ensured;
the balance execution module reports real-time charging and discharging states and current data to the battery cell balance control module (2), the battery cell balance control module (2) analyzes the voltage, the SOC state and the accumulated charging and discharging electric quantity of the battery cell in real time, dynamically analyzes and controls the balance action of the battery cell, and the battery cell is prevented from being overcharged or overdischarged;
the balance system does not directly participate in or control the charging and discharging processes of the energy storage system, but needs to perform related strategy judgment according to the charging and discharging states of the energy storage system, so that the battery cell balance operation is accurate and reasonable, the service life of the system is verified, and the safety of the system is ensured;
the balance energy bus (3) can be connected with a 12V or 24V power supply circuit of the cell balance control module (2) and the balance execution module, energy is provided for the secondary system through the discharge of the cell with high voltage and SOC, or the balance of electric quantity among the cells is realized through obtaining the energy from the secondary system to be low voltage and the supplement of the cell with SOC, so that the utilization rate of the electric quantity and the balance control capability of the system are further improved.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117895626A (en) * | 2024-03-15 | 2024-04-16 | 上海采日能源科技有限公司 | Control method and control system for cell balance in energy storage system |
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| CN117895626A (en) * | 2024-03-15 | 2024-04-16 | 上海采日能源科技有限公司 | Control method and control system for cell balance in energy storage system |
| CN117895626B (en) * | 2024-03-15 | 2024-05-14 | 上海采日能源科技有限公司 | Control method and control system for cell balance in energy storage system |
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Application publication date: 20220408 |