Battery equalization control method and system, energy storage device and communication equipment

Abstract

The invention relates to a battery equalization control method and system, an energy storage device and communication equipment. The method comprises the following steps: acquiring electrical parameters of a plurality of battery cells connected in series in a battery; determining a target battery cell from the battery cells according to the electrical parameters; controlling a working mode of a target equalization module connected with the target battery cell according to the electrical parameter of the target battery cell, so that the electrical parameter of the target battery cell meets a preset equalization condition; and the target equalization module is used for supporting energy transfer between the target battery cell and the battery bus. By adopting the method, energy can flow from the battery cell with high energy to the battery cell with low energy in the battery, the situation that the battery cell is damaged due to overvoltage or undervoltage can be avoided, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of battery balancing, and in particular to a battery balancing control method and system, an energy storage device, and a communication device. Background Art

[0002] Traditional electrochemical energy storage devices, such as energy storage batteries in communication rooms, mostly connect battery cells in series and directly supply power to the outside. However, due to differences in manufacturing processes and uneven materials, as well as differences in temperature, density, and self-discharge of each cell during use, the cells in the battery pack will be inconsistent. This leads to the situation that during the charging process, one cell is already fully charged, but other cells are not fully charged. In this case, if you continue to charge the fully charged cell, it will cause the cell to overvoltage or even damage the cell. The discharge process is similar. There must be a situation where one cell is already undervoltage, but other cells are not undervoltage. In this case, if you continue to discharge, the cell will be damaged. Summary of the invention

[0003] Based on this, it is necessary to provide a battery balancing control method and system, an energy storage device, and a communication device to address the above technical problems.

[0004] In a first aspect, the present application provides a battery balancing control method, the method comprising:

[0005] Obtain electrical parameters of multiple series-connected cells in a battery;

[0006] Determine a target battery cell from each of the battery cells according to each of the electrical parameters;

[0007] According to the electrical parameters of the target battery cell, the working mode of the target balancing module connected to the target battery cell is controlled so that the electrical parameters of the target battery cell meet the preset balancing conditions; the target balancing module is used to support energy transfer between the target battery cell and the battery bus.

[0008] In one embodiment, the electrical parameter includes voltage and current, and controlling the working mode of the target balancing module connected to the target battery cell according to the electrical parameter of the target battery cell includes:

[0009] Determining a target mode of the target balancing module according to the voltage of each of the battery cells;

[0010] Determining a target control amount of the target battery cell according to the current of the target battery cell;

[0011] According to the target control amount, the target balancing module is controlled to operate in the target mode.

[0012] In one embodiment, determining the target mode of the target balancing module according to the voltage of each of the battery cells includes:

[0013] Determining the average voltage of the battery according to the voltage of each of the battery cells;

[0014] When the target cell voltage is greater than the average voltage of the battery, and the absolute value of the difference between the target cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be a discharge mode; wherein the target balancing module is used to support the energy of the target cell to flow to the battery bus in the discharge mode;

[0015] When the target cell voltage is less than the average voltage of the battery and the absolute value of the difference between the target cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be the charging mode; wherein the target balancing module is used to support the energy of the battery bus to flow to the target cell in the discharge mode.

[0016] In one embodiment, determining the target control amount of the battery cell according to the current of the target battery cell includes:

[0017] Respectively obtaining a historical current difference value and a current current difference value between the target cell current and a preset current;

[0018] The target control amount is determined according to the historical current difference, the current current difference and a preset gain parameter.

[0019] In one embodiment, determining the target control amount according to the historical current difference, the current current difference and a preset gain parameter includes:

[0020] Determine an initial control amount according to the historical current difference, the current current difference and a preset gain parameter;

[0021] In a case where the initial control amount is greater than a first control amount threshold, determining the first control amount threshold as the target control amount;

[0022] In the case where the initial control amount is less than or equal to the first control amount threshold and greater than or equal to the second control amount threshold, the initial control amount is determined as the target control amount; the first control amount threshold is greater than the second control amount threshold;

[0023] When the initial control amount is smaller than the second control amount threshold, the second control amount threshold is used as the target control amount.

[0024] In a second aspect, the present application provides a battery balancing control system, the system comprising:

[0025] A detection circuit, connected to each of the battery cells, for collecting electrical parameters of a plurality of battery cells connected in series in the battery;

[0026] A balancing circuit, comprising a plurality of balancing modules, wherein the balancing modules are respectively connected to the battery busbar and the battery cells, and different balancing modules are connected to different battery cells;

[0027] The control circuit is respectively connected to the detection circuit and each of the balancing modules, and is used to obtain each of the electrical parameters, determine a target battery cell from each of the battery cells according to each of the electrical parameters, and control the working state of the target balancing module connected to the target battery cell according to the electrical parameters of the target battery cell, so that the target battery cell transfers energy with the battery bus through the target balancing module, so that the electrical parameters of the target battery cell meet the preset balancing conditions.

[0028] In one embodiment, the balancing module includes:

[0029] A first power electronic module, connected to the battery bus, for realizing conversion between the battery bus voltage and the first AC voltage;

[0030] a voltage conversion module, connected to the first power electronic module, and configured to realize conversion between the first AC voltage and a second AC voltage;

[0031] The second power electronic module is connected to the voltage conversion module and the corresponding battery cell respectively, and is used to realize the conversion between the second AC voltage and the voltage of the battery cell.

[0032] In one embodiment, the target power electronic module includes one of the first power electronic module and the second power electronic module; the target power electronic module includes:

[0033] A voltage stabilizing unit connected to the battery bus or the corresponding battery cell;

[0034] A driving unit, connected to the control circuit, and configured to output a driving signal under the control of the control circuit;

[0035] The power unit is respectively connected to the driving unit, the voltage stabilizing unit and the voltage conversion module, and is used to realize the conversion between the battery bus voltage and the first AC voltage, or the conversion between the second AC voltage and the voltage of the battery cell under the drive of the driving signal.

[0036] In a third aspect, the present application provides an energy storage device, including a battery and a battery balancing control system provided by any of the above embodiments, wherein the battery includes a plurality of battery cells connected in series, and the battery balancing control system is respectively connected to a battery bus and each of the battery cells.

[0037] In a fourth aspect, the present application provides a communication device, comprising the energy storage device provided by any of the above embodiments.

[0038] In the above-mentioned battery balancing control method and system, energy storage device, and communication equipment, the electrical parameters of multiple series-connected cells in the battery are obtained, and the target cell is determined from each cell according to each electrical parameter. Furthermore, according to the electrical parameters of the target cell, the working mode of the target balancing module connected to the target cell is controlled, and the target cell and the battery bus can transfer energy through the target balancing module, so that the electrical parameters of the target cell meet the preset balancing conditions, thereby avoiding the battery cell from being damaged due to overvoltage or undervoltage, and improving the life of the cell. In addition, the target cell and the battery bus transfer energy through the target balancing module, which realizes the flow of excess energy from high-energy cells to low-energy cells inside the battery, reduces energy loss, and does not require additional energy storage modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A structural block diagram of a battery balancing control system in one embodiment;

[0041] Figure 2 A schematic diagram of a flow chart of a battery balancing control method in one embodiment;

[0042] Figure 3 It is a flowchart of controlling the working mode of the target balancing module connected to the target battery cell according to the electrical parameters of the target battery cell in one embodiment;

[0043] Figure 4 A schematic diagram of a flow chart of determining a target control amount according to a historical current difference, a current current difference and a preset gain parameter in one embodiment;

[0044] Figure 5 is a flow chart of a battery balancing control method according to another embodiment;

[0045] Figure 6 A structural block diagram of a balancing module in an embodiment;

[0046] Figure 7 is a structural block diagram of a battery balancing control device in one embodiment;

[0047] Figure 8 FIG. 4 is an internal block diagram of a controller in one embodiment. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] The battery balancing control method provided in this application can be applied to Figure 1 In the battery balancing control system shown. Among them, the control circuit 100 is connected to the balancing circuit 200 and the detection circuit 300 respectively, and the control circuit 100 can be a single-chip microcomputer, an MCU (Micro Controller Unit, microprocessor) or an FPGA (Field Programmable Gate Array, field programmable logic array), etc. The detection circuit 300 is connected to each battery cell 410 and can be used to collect the electrical parameters of each battery cell 410. The balancing circuit 200 includes a plurality of balancing modules 210, each balancing module 210 is connected to the battery bus and the battery cell 410 respectively, and the battery cells 410 connected to different balancing modules 210 are different. The balancing module 210 is used to support the energy transfer between the battery cell 410 and the battery bus. The battery 400 includes battery cells 410 connected in series, and the line connected to the positive electrode of the first battery cell and the negative electrode of the last battery cell is used as the battery bus.

[0050] In one embodiment, Figure 2 As shown, the battery balancing control method is applied to Figure 1 Taking the control circuit in as an example, it includes steps 202 to 206.

[0051] Step 202, obtaining electrical parameters of a plurality of battery cells connected in series in a battery.

[0052] Electrical parameters include current, voltage, remaining capacity, charging power and discharging power, etc.

[0053] Step 204 , determining a target battery cell from among the battery cells according to the electrical parameters.

[0054] The target cell is a cell with a balancing requirement. The control circuit can determine the target cell from each cell according to each electrical parameter. For example, the control circuit can obtain the average voltage according to the voltage of each cell, and take the cell whose absolute value of the difference between the cell voltage and the average voltage is greater than the preset difference threshold as the target cell. The preset difference threshold can be 50mA, 80mA or 100mA, etc., which can be reasonably set based on empirical rules.

[0055] Step 206 : controlling the working mode of the target balancing module connected to the target cell according to the electrical parameters of the target cell, so that the electrical parameters of the target cell meet the preset balancing conditions.

[0056] The preset balancing condition means that the energy and voltage of the target cell are basically consistent with those of other cells in the battery.

[0057] The target balancing module is used to support energy transfer between the target battery cell and the battery bus. The working modes of the target balancing module include charging mode and discharging mode. When the target balancing module is in charging mode, the energy of the battery bus flows to the target battery cell through the target balancing module; when the target balancing module is in discharging mode, the energy of the target battery cell flows to the battery bus through the target balancing module.

[0058] It can be understood that the control module can control the target balancing module connected to the target cell to be in charging mode or discharging mode according to the electrical parameters of the target cell, so that energy can be transferred between the target cell and the battery bus through the target balancing module, thereby keeping the voltage and energy of the target cell consistent with those of other cells.

[0059] In the embodiment of the present application, the electrical parameters of multiple series-connected cells in the battery are obtained, and the target cell is determined from each cell according to the electrical parameters. Furthermore, according to the electrical parameters of the target cell, the working mode of the target balancing module connected to the target cell is controlled. The target cell and the battery bus can transfer energy through the target balancing module, so that the electrical parameters of the target cell meet the preset balancing conditions, thereby avoiding the battery cell from being damaged due to overvoltage or undervoltage, and improving the life of the cell. In addition, the target cell and the battery bus transfer energy through the target balancing module, which realizes the flow of excess energy inside the battery, reduces energy loss, and does not require additional energy storage modules.

[0060] In one embodiment, Figure 3 As shown, according to the electrical parameters of the target battery cell, the working mode of the target balancing module connected to the target battery cell is controlled, including steps 302 to 306.

[0061] Step 302: Determine a target mode of a target balancing module according to the voltage of each battery cell.

[0062] The target mode is one of a charging mode or a discharging mode.

[0063] Specifically, the control circuit can first obtain the average voltage of the battery according to the voltage of each battery cell. When the target battery cell voltage is greater than the average voltage of the battery, and the absolute value of the difference between the target battery cell voltage and the average voltage is greater than the preset difference threshold, the target mode is determined to be the discharge mode. It can be understood that when the target battery cell voltage is greater than the average voltage of the battery, and the absolute value of the difference between the target battery cell voltage and the average voltage is greater than the preset difference threshold, the excess energy of the target battery cell needs to be released. Therefore, the working mode of the target balancing module connected to the target battery cell can be determined as the discharge mode, so that the energy of the target battery cell flows to the battery bus through the target balancing module.

[0064] When the target cell voltage is less than the average voltage of the battery, and the absolute value of the difference between the target cell voltage and the average voltage is greater than the preset difference threshold, the target mode is determined to be the charging mode. It can be understood that when the target cell voltage is less than the average voltage of the battery, and the absolute value of the difference between the target cell voltage and the average voltage is greater than the preset difference threshold, the voltage of the target cell needs to be increased so that the voltage of the target cell is consistent with that of other cells. Therefore, the working mode of the target balancing module connected to the target cell can be determined as the charging mode, so that the energy of the battery bus flows to the target cell through the target balancing module.

[0065] Step 304: determine a target control amount of the target battery cell according to the current of the target battery cell.

[0066] The target control amount refers to the energy that needs to be released or replenished for the target cell to reach the preset equilibrium condition. The control circuit can use a proportional-integral-differential (PID) algorithm to obtain the target control amount based on the current difference between the target cell current and the preset current.

[0067] Specifically, the historical current difference and current current difference between the target cell current and the preset current can be obtained respectively, and the target control amount can be determined according to the historical current difference, the current current difference and the preset gain parameter. Among them, the preset current can be set based on empirical rules, and is generally not greater than 0.2 of the cell capacity, that is, the preset current is less than or equal to 0.2C. The historical current difference may include the current difference calculated last time and the current difference calculated the last time. The preset gain parameters include proportional gain parameters, integral gain parameters and differential gain parameters, and the proportional gain parameters, integral gain parameters and differential gain parameters can be set in advance based on empirical rules.

[0068] Assuming that the current difference is E(k), the last calculated current difference is E(k-1), and the last calculated current difference is E(k-2), then the target control quantity U(k) is:

[0069] U(k)=Kp*E(k)+Ki*E(k-1)+Kd*E(k-2).

[0070] Among them, Kp represents the proportional gain parameter, Ki represents the integral gain parameter, and Kd represents the differential gain parameter.

[0071] Step 306 , controlling the target balancing module to operate in the target mode according to the target control amount.

[0072] The control circuit can control the target balancing module to operate in a target mode based on the target control amount, so that the target battery cell reaches a preset balancing condition.

[0073] In this embodiment, the target mode of the target balancing module is determined according to the voltage of each battery cell, and the target control amount of the target battery cell is determined according to the current of the target battery cell. Further, according to the target control amount, the target balancing module is controlled to operate in the target mode, thereby achieving flow direction control and quantitative control of excess energy in the battery.

[0074] In one embodiment, Figure 4 As shown, the target control amount is determined according to the historical current difference, the current current difference and the preset gain parameter, including steps 402 to 408.

[0075] Step 402, determining an initial control amount according to a historical current difference, a current current difference and a preset gain parameter.

[0076] It can be understood that the initial control amount U'(k)= Kp*E(k)+Ki*E(k-1)+Kd*E(k-2) can be determined based on the historical current difference, the current current difference and the preset gain parameter.

[0077] Step 404: when the initial control amount is greater than the first control amount threshold, the first control amount threshold is determined as the target control amount.

[0078] The first control amount threshold is related to the maximum level that the control circuit can output. If the initial control amount is greater than the first control amount threshold, the control circuit cannot output the value of the initial control amount. Therefore, the first control amount threshold needs to be used as the target control amount.

[0079] Step 406: When the initial control amount is less than or equal to the first control amount threshold and greater than or equal to the second control amount threshold, the initial control amount is determined as the target control amount.

[0080] Step 408: When the initial control amount is less than the second control amount threshold, the second control amount threshold is used as the target control amount.

[0081] The first control amount threshold is greater than the second control amount threshold. The second control amount threshold is the control amount required to start the target balancing module. If the initial control amount is less than the second control amount threshold, the target balancing module cannot be started normally, so the second control amount threshold needs to be used as the target control amount.

[0082] For better understanding, a more specific embodiment is listed to illustrate the battery balancing control method of the present application.

[0083] like Figure 5 As shown, the voltage of each battery cell is first obtained, and the average voltage Va is obtained according to the voltage of each battery cell.

[0084] When the absolute value of the difference between the cell voltage V and the average voltage Va is less than a preset difference threshold, the cell is determined as a target cell, and the magnitude of the target cell voltage V and the average voltage Va is determined.

[0085] If the target cell voltage V>average voltage Va, the target cell needs to discharge to the battery bus, determine the working mode of the target balancing module as discharge mode, obtain the discharge current Id and preset current Iset of the target cell, and let E(k)=Iset-Id.

[0086] If the target cell voltage V<average voltage Va, the battery bus is required to charge the target cell, determine the working mode of the target balancing module as charging mode, obtain the charging current Ic and preset current Iset of the target cell, and set E(k)=Iset-Ic.

[0087] Use PID controller to calculate the target control quantity U(k) = Kp*E(k)+Ki*E(k-1)+Kd*E(k-2). At the initial moment, E(k-1)=E(k), E(k-2)=E(k).

[0088] If U(k) is greater than the first control value threshold Umax, then let U(k)=Umax; if U(k) is less than the second control value threshold Umin, then let U(k)=Umin.

[0089] The target control quantity U(k) is output to the target balancing module so that the target battery cell transfers energy with the battery bus, thereby making the energy and voltage of the target battery cell consistent with those of other battery cells.

[0090] Let E(k-1)=E(k), E(k-2)=E(k-1), and start the next sampling until all cells are discharged or fully charged.

[0091] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0092] In one embodiment, Figure 1 As shown, the present application also provides a battery balancing control system, including a detection circuit 300, a balancing circuit 200 and a control circuit 100. The connection relationship between the circuits is not repeated here.

[0093] The detection circuit 300 is used to collect electrical parameters of a plurality of battery cells 410 connected in series in the battery. The detection circuit 300 may include a variety of sensors.

[0094] The control circuit 100 can be used to obtain various electrical parameters, determine the target battery cell from each battery cell according to the various electrical parameters, and control the working state of the target balancing module connected to the target battery cell according to the electrical parameters of the target battery cell, so that the target battery cell transfers energy between the target balancing module and the battery bus, so that the electrical parameters of the target battery cell meet the preset balancing conditions.

[0095] In one embodiment, Figure 6 As shown, the balancing module 210 includes a first power electronic module 211, a voltage conversion module 212 and a second power electronic module 213. The first power electronic module 211 is connected to the battery bus and the voltage conversion module 212 respectively, and the second power electronic module 213 is connected to the voltage conversion module 212 and the corresponding battery cell respectively.

[0096] The first power electronic module 211 may be used to implement conversion between the battery bus voltage and the first AC voltage.

[0097] The voltage conversion module 212 can be used to realize the conversion between the first AC voltage and the second AC voltage. The voltage conversion module can be an isolation transformer.

[0098] The second power electronic module 213 may be used to implement conversion between the second AC voltage and the voltage of the battery cell.

[0099] It can be understood that when the working mode of the target balancing module is the charging mode, the bus voltage can be converted into a first AC voltage by the first power electronic module 211 and transmitted to the voltage conversion module 212. The voltage conversion module 212 converts the first AC voltage into a second AC voltage and transmits it to the second power electronic module 213. The second power electronic module 213 converts the second AC voltage into a DC voltage and then superimposes it on the target battery cell. When the working mode of the target balancing module is the discharging mode, the second power electronic module 213 converts the voltage of the battery cell into a second AC voltage, the voltage conversion module 212 converts the second AC voltage into a first AC voltage, and then the first power electronic module 211 converts the first AC voltage into a DC voltage and then superimposes it on the battery bus.

[0100] In addition, the number of the first power electronic modules 211 and the second power electronic modules 213 may be the same or different, and multiple balancing modules may share one first power electronic module 211 .

[0101] Further, the target power electronic module includes one of the first power electronic module 211 and the second power electronic module 213. The target power electronic module includes a voltage stabilizing unit, a driving unit and a power unit.

[0102] The voltage stabilizing unit is connected to the battery bus or the corresponding battery cell.

[0103] The driving unit is connected to the control circuit 100 and is used to output a driving signal under the control of the control circuit 100 .

[0104] The power unit is connected to the driving unit, the voltage stabilizing unit and the voltage conversion module 212 respectively, and is used to realize the conversion between the battery bus voltage and the first AC voltage, or the conversion between the second AC voltage and the voltage of the battery cell under the drive of the driving signal.

[0105] Please continue to refer to Figure 6 In the case where the target power electronic module is the first power electronic module 211, the voltage stabilizing unit includes a first capacitor C1, the driving unit includes four driving chips (i.e., U1, U2, U3, and U4), the power unit includes four power switch tubes (i.e., Q1, Q2, Q3, and Q4), and the four driving chips and the four power switch tubes are connected one by one. The control circuit 100 can control the driving chip to output a driving signal to the corresponding power switch tube to adjust the duty cycle of the power switch tube, thereby realizing the conversion between the battery bus voltage and the first AC voltage.

[0106] When the target power electronic module is the second power electronic module 213, the voltage stabilizing unit includes a second capacitor C2, the driving unit includes four driving chips (i.e., U5, U6, U7, and U8), the power unit includes four power switch tubes (i.e., Q5, Q6, Q7, and Q8), and the four driving chips and the four power switch tubes are connected one by one. The control circuit 100 can control the driving chip to output a driving signal to the corresponding power switch tube to adjust the duty cycle of the power switch tube, thereby realizing the conversion between the cell voltage and the second AC voltage.

[0107] The power switch tube may be an IGBT (Insulate-Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), etc. The balancing current flowing through the power switch tube may reach more than ten amperes, which can effectively shorten the balancing time.

[0108] In one embodiment, the control circuit 100 is further used to determine a target mode of a target balancing module according to the voltage of each battery cell; determine a target control amount of a target battery cell according to the current of the target battery cell; and control the target balancing module to operate in a target mode according to the target control amount.

[0109] In one embodiment, the control circuit 100 is also used to determine the average voltage of the battery based on the voltage of each battery cell; when the target battery cell voltage is greater than the average voltage of the battery, and the absolute value of the difference between the target battery cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be the discharge mode; when the target battery cell voltage is less than the average voltage of the battery, and the absolute value of the difference between the target battery cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be the charging mode.

[0110] In one embodiment, the control circuit 100 is further used to respectively obtain the historical current difference and the current difference between the target cell current and the preset current; and determine the target control amount according to the historical current difference, the current current difference and the preset gain parameter.

[0111] In one embodiment, the control circuit 100 is also used to determine an initial control amount based on a historical current difference, a current current difference and a preset gain parameter; when the initial control amount is greater than a first control amount threshold, the first control amount threshold is determined as a target control amount; when the initial control amount is less than or equal to the first control amount threshold and greater than or equal to a second control amount threshold, the initial control amount is determined as a target control amount; the first control amount threshold is greater than the second control amount threshold; when the initial control amount is less than the second control amount threshold, the second control amount threshold is used as the target control amount.

[0112] In some embodiments, the detection circuit 100 can also perform leakage detection and temperature detection. The control circuit can also perform thermal management on the battery based on the temperature detected by the detection circuit to maintain the performance and life of the battery.

[0113] In one embodiment, the control circuit 100 is also used to control the battery balancing control system to stop running when it is determined according to the electrical parameters of each battery cell that all the battery cells are in an undervoltage state, and to control the battery balancing control system to be in a standby state when it is determined according to the electrical parameters of each battery cell that all the battery cells are fully charged.

[0114] In one embodiment, the present application also provides an energy storage device, including a battery and a battery balancing control system provided in any of the above embodiments, wherein the battery includes a plurality of battery cells connected in series, and the battery balancing control system is respectively connected to a battery bus and each of the battery cells.

[0115] In one embodiment, the present application further provides a communication device, comprising the energy storage device provided by any of the above embodiments.

[0116] Based on the same inventive concept, the embodiment of the present application also provides a battery balancing control device for implementing the battery balancing control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery balancing control device embodiments provided below can refer to the limitations of the battery balancing control method above, and will not be repeated here.

[0117] In one embodiment, Figure 7 As shown, a battery balancing control device is provided, including an electrical parameter acquisition module 702, a target battery cell determination module 704 and a working mode determination module 706.

[0118] The electrical parameter acquisition module 702 is used to acquire electrical parameters of a plurality of battery cells connected in series in a battery.

[0119] The target cell determination module 704 is used to determine a target cell from the cells according to the electrical parameters.

[0120] The working mode determination module 706 is used to control the working mode of the target balancing module connected to the target battery cell according to the electrical parameters of the target battery cell, so that the electrical parameters of the target battery cell meet the preset balancing conditions; the target balancing module is used to support the energy transfer between the target battery cell and the battery bus.

[0121] In one embodiment, the working mode determination module is also used to determine the target mode of the target balancing module according to the voltage of each of the battery cells; determine the target control amount of the target battery cell according to the current of the target battery cell; and control the target balancing module to operate in the target mode according to the target control amount.

[0122] In one embodiment, the working mode determination module is further used to determine the average voltage of the battery according to the voltage of each of the battery cells;

[0123] When the target cell voltage is greater than the average voltage of the battery, and the absolute value of the difference between the target cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be a discharge mode; wherein the target balancing module is used to support the energy of the target cell to flow to the battery bus in the discharge mode;

[0124] When the target cell voltage is less than the average voltage of the battery and the absolute value of the difference between the target cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be the charging mode; wherein the target balancing module is used to support the energy of the battery bus to flow to the target cell in the discharge mode.

[0125] In one embodiment, the working mode determination module is further used to respectively obtain a historical current difference and a current difference between the target cell current and the preset current;

[0126] The target control amount is determined according to the historical current difference, the current current difference and a preset gain parameter.

[0127] In one embodiment, the working mode determination module is further used to determine the initial control amount according to the historical current difference, the current current difference and a preset gain parameter;

[0128] In a case where the initial control amount is greater than a first control amount threshold, determining the first control amount threshold as the target control amount;

[0129] In the case where the initial control amount is less than or equal to the first control amount threshold and greater than or equal to the second control amount threshold, the initial control amount is determined as the target control amount; the first control amount threshold is greater than the second control amount threshold;

[0130] When the initial control amount is smaller than the second control amount threshold, the second control amount threshold is used as the target control amount.

[0131] Each module in the above-mentioned battery balancing control device can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0132] In an exemplary embodiment, a controller is provided. The controller may be a server, and its internal structure diagram may be as shown in FIG. Figure 8 As shown. The controller includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the controller is used to store electrical parameters, preset difference thresholds, preset currents, etc. The input / output interface of the controller is used to exchange information between the processor and an external device. The communication interface of the controller is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery balancing control method is implemented.

[0133] Those skilled in the art will understand that Figure 8 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the controller to which the scheme of the present application is applied. The specific controller may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0134] In an exemplary embodiment, a controller is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the battery balancing control method provided in any of the above embodiments is implemented.

[0135] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the battery balancing control method provided in any of the above embodiments is implemented.

[0136] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the battery balancing control method provided in any of the above embodiments is implemented.

[0137] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0138] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0139] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery balancing control method, characterized in that: The method comprises: Obtain electrical parameters of multiple series-connected cells in a battery; Determine a target battery cell from each of the battery cells according to each of the electrical parameters; According to the electrical parameters of the target battery cell, the working mode of the target balancing module connected to the target battery cell is controlled so that the electrical parameters of the target battery cell meet the preset balancing conditions; the target balancing module is used to support energy transfer between the target battery cell and the battery bus.

2. The method according to claim 1, characterized in that The electrical parameters include voltage and current, and controlling the working mode of the target balancing module connected to the target battery cell according to the electrical parameters of the target battery cell includes: Determining a target mode of the target balancing module according to the voltage of each of the battery cells; Determining a target control amount of the target battery cell according to the current of the target battery cell; According to the target control amount, the target balancing module is controlled to operate in the target mode.

3. The method according to claim 2, characterized in that Determining the target mode of the target balancing module according to the voltage of each of the battery cells includes: Determining the average voltage of the battery according to the voltage of each of the battery cells; When the target cell voltage is greater than the average voltage of the battery, and the absolute value of the difference between the target cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be a discharge mode; wherein the target balancing module is used to support the energy of the target cell to flow to the battery bus in the discharge mode; When the target cell voltage is less than the average voltage of the battery and the absolute value of the difference between the target cell voltage and the average voltage is greater than a preset difference threshold, the target mode is determined to be the charging mode; wherein the target balancing module is used to support the energy of the battery bus to flow to the target cell in the discharge mode.

4. The method according to claim 2, characterized in that: The step of determining a target control amount of the battery cell according to the current of the target battery cell comprises: Respectively obtaining a historical current difference value and a current current difference value between the target cell current and a preset current; The target control amount is determined according to the historical current difference, the current current difference and a preset gain parameter.

5. The method according to claim 4, characterized in that The determining the target control amount according to the historical current difference, the current current difference and a preset gain parameter includes: Determine an initial control amount according to the historical current difference, the current current difference and a preset gain parameter; In a case where the initial control amount is greater than a first control amount threshold, determining the first control amount threshold as the target control amount; In the case where the initial control amount is less than or equal to the first control amount threshold and greater than or equal to the second control amount threshold, the initial control amount is determined as the target control amount; the first control amount threshold is greater than the second control amount threshold; When the initial control amount is smaller than the second control amount threshold, the second control amount threshold is used as the target control amount.

6. A battery balancing control system, characterized in that: The system comprises: A detection circuit is connected to each battery cell respectively and is used to collect electrical parameters of multiple battery cells connected in series in the battery; A balancing circuit, comprising a plurality of balancing modules, wherein the balancing modules are respectively connected to the battery busbar and the battery cells, and different balancing modules are connected to different battery cells; The control circuit is respectively connected to the detection circuit and each of the balancing modules, and is used to obtain each of the electrical parameters, determine a target battery cell from each of the battery cells according to each of the electrical parameters, and control the working state of the target balancing module connected to the target battery cell according to the electrical parameters of the target battery cell, so that the target battery cell transfers energy with the battery bus through the target balancing module, so that the electrical parameters of the target battery cell meet the preset balancing conditions.

7. The battery balancing control system according to claim 6, characterized in that: The balancing module comprises: a first power electronic module connected to the battery bus and configured to realize conversion between the battery bus voltage and the first AC voltage; a voltage conversion module, connected to the first power electronic module, and configured to realize conversion between the first AC voltage and a second AC voltage; The second power electronic module is connected to the voltage conversion module and the corresponding battery cell respectively, and is used to realize the conversion between the second AC voltage and the voltage of the battery cell.

8. The battery balancing control system according to claim 7, characterized in that: The target power electronic module includes one of the first power electronic module and the second power electronic module; The target power electronic module comprises: A voltage stabilizing unit connected to the battery bus or the corresponding battery cell; A driving unit, connected to the control circuit, and configured to output a driving signal under the control of the control circuit; The power unit is respectively connected to the driving unit, the voltage stabilizing unit and the voltage conversion module, and is used to realize the conversion between the battery bus voltage and the first AC voltage, or the conversion between the second AC voltage and the voltage of the battery cell under the drive of the driving signal.

9. An energy storage device, characterized in that: It comprises a battery and a battery balancing control system as claimed in any one of claims 5 to 8, wherein the battery comprises a plurality of battery cells connected in series, and the battery balancing control system is respectively connected to a battery bus and each of the battery cells.

10. A communication device, characterized in that: Comprising the energy storage device as claimed in claim 9.

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