Control method for charging and discharging system capable of connecting to dual batteries, device and storage medium

Abstract

A control method for a charging and discharging system capable of connecting to dual batteries, a device, and a storage medium. A plurality of charging and discharging modules, module controllers and a master controller are provided, the input of each charging and discharging module is connected to a bus, and the output of each charging and discharging module is connected to batteries by means of switches. The control method comprises: each module controller obtains a power-voltage derating curve on the basis of a current state of each module; the master controller collects voltage information of batteries and transmits the voltage information to each module controller; each module controller determines power information of each module under the battery voltage on the basis of the power-voltage derating curve, and sends the power information to the master controller; the master controller determines connection relationships between each module and the batteries on the basis of the power information, and sends the connection relationships to each module controller; and each module controller controls corresponding switches to be connected or disconnected. The control method for a charging and discharging system capable of connecting to dual batteries of the present application enables a battery to be switched to be connected to an optimal charging and discharging module, and effectively improves the charging efficiency of battery units.

Description

Method, device and storage medium for controlling charge-discharge system capable of accessing double batteries TECHNICAL FIELD

[0001] The present application relates to the technical field of charge-discharge system control, and particularly relates to a method, device and storage medium for controlling a charge-discharge system capable of accessing double batteries. BACKGROUND

[0002] For application fields such as battery energy storage, charging piles and vehicle-to-grid (V2G), in order to be capable of simultaneously accessing energy storage batteries and electric vehicles of different types and having different voltage levels, a battery charge-discharge system needs to be configured with multiple groups of single-output DCDC charge-discharge modules to be connected with battery units having different voltage levels, but the output power of each charge-discharge module is affected by factors such as voltage, temperature and faults, and it is difficult to achieve charging of the battery units at the optimal charging power, and the charging efficiency is low.

[0003] SUMMARY

[0004] The present application aims to provide a method, device and storage medium for controlling a charge-discharge system capable of accessing double batteries, which is beneficial to flexible switching of battery units to connection with optimal charge-discharge modules and charging at the optimal charging power, and effectively improves the charging efficiency of the battery units.

[0005] To achieve the above-mentioned purpose, the present application discloses a method for controlling a charge-discharge system capable of accessing double batteries, which provides multiple charge-discharge modules and a total controller, the positive and negative terminals of each charge-discharge module are connected with the positive and negative terminals of a bus, the positive terminal output by each charge-discharge module is connected with the positive terminal of a first battery through a first switch, the positive terminal output by each charge-discharge module is connected with the positive terminal of a second battery through a second switch, the negative terminal output by each charge-discharge module is connected with the negative terminal of the first battery and the negative terminal of the second battery, the total controller is connected with the first battery and the second battery, and each charge-discharge module is provided with a module controller connected with the total controller,

[0006] The control method comprises the following steps:

[0007] Each module controller obtains a power-voltage drop curve of each charge-discharge module according to the current state of each charge-discharge module;

[0008] The total controller collects voltage information of the first battery and the second battery, and transmits the collected voltage information to each module controller;

[0009] The module controllers determine power information of the charging and discharging modules at the voltage of the first battery and at the voltage of the second battery according to power-voltage degradation curves of the charging and discharging modules, and send the determined power information to the general controller;

[0010] The general controller determines connection relationships of the charging and discharging modules with the first battery and the second battery according to the power information, and sends the connection relationships to the module controllers correspondingly;

[0011] The module controllers control the first switches and the second switches to be connected or disconnected according to the received connection relationships.

[0012] Further, the "the module controllers control the first switches and the second switches to be connected or disconnected according to the received connection relationships" includes:

[0013] The module controllers perform one of the following operations according to the received connection relationships:

[0014] control the first switches to be connected and the second switches to be disconnected;

[0015] control the first switches to be disconnected and the second switches to be connected;

[0016] control the first switches to be disconnected and the second switches to be disconnected.

[0017] Further, the "the general controller determines connection relationships of the charging and discharging modules with the first battery and the second battery according to the power information" includes:

[0018] sort the power information of the charging and discharging modules at the voltage of the first battery, and sort the power information of the charging and discharging modules at the voltage of the second battery;

[0019] select at least one of the charging and discharging modules to be connected with the first battery according to the power requirement of the first battery, and select at least one of the charging and discharging modules to be connected with the second battery according to the power requirement of the second battery;

[0020] determine the connection relationships of the charging and discharging modules with the first battery and the second battery according to the selected charging and discharging modules.

[0021] Further, the charge-discharge module comprises a first DC converter, a second DC converter, a first half-bridge unit and a second half-bridge unit, the positive and negative terminals of the first DC converter and the second DC converter are connected with the positive and negative terminals of the bus, the positive terminal of the output of the first DC converter is connected with the first terminal of the input of the first half-bridge unit, the negative terminal of the output of the first DC converter is connected with the second terminal of the input of the first half-bridge unit and the first terminal of the input of the second half-bridge unit, the positive terminal of the output of the second DC converter is connected with the second terminal of the input of the first half-bridge unit and the first terminal of the input of the second half-bridge unit, the negative terminal of the output of the second DC converter is connected with the second terminal of the input of the second half-bridge unit, the midpoint of the first half-bridge unit is formed as the positive terminal of the output of the charge-discharge module, and the midpoint of the second half-bridge unit is formed as the negative terminal of the output of the charge-discharge module.

[0022] To achieve the above object, the present application discloses an electronic device, which comprises:

[0023] one or more processors;

[0024] one or more memories for storing one or more programs, when the one or more programs are executed by the processor, the processor implements the charge-discharge system control method of the double-battery accessible as described above.

[0025] To achieve the above object, the present application discloses a computer readable storage medium, which stores a program, when the program is executed by a processor, the method of the charge-discharge system control method of the double-battery accessible as described above is implemented.

[0026] In the present application, the connection relationship between each charge-discharge module and the first battery and the second battery is determined by the cooperation of the main controller and the module controllers, each module controller is connected with the first battery through the first switch and connected with the second battery through the second switch, each module controller first obtains the power-voltage drop curve of each charge-discharge module according to the current state of each charge-discharge module, and then the power of each charge-discharge module under the voltage of the first battery and under the voltage of the second battery can be determined according to the voltage of the first battery and the second battery collected by the total controller, and the connection relationship between each charge-discharge module and the first battery and the second battery is determined by the total controller according to the above power information, and finally the corresponding first switch and the corresponding second switch are controlled to be connected or disconnected by each module controller, so that the first battery and the second battery can be flexibly switched to be connected with the best charge-discharge module and charged at the best charging power, and the charging efficiency of the battery unit is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a flow chart of the method for controlling the charging and discharging system of the double battery accessible to the embodiment of the application.

[0028] Figure 2 is a structural schematic diagram of the charging and discharging system in the method for controlling the charging and discharging system of the double battery accessible to the embodiment of the application.

[0029] Figure 3 is a circuit structural diagram of the charging and discharging module in the method for controlling the charging and discharging system of the double battery accessible to the embodiment of the application.

[0030] Figure 4 is a system diagram of the electronic device of the embodiment of the application. DETAILED DESCRIPTION

[0031] To describe the technical content, structural features, achieved purposes and effects of the application in detail, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0032] Embodiment One

[0033] Please refer to Figures 1 to 3, the application discloses a method for controlling the charging and discharging system of the double battery accessible, provides a plurality of charging and discharging modules and a total controller, the positive and negative terminals of each charging and discharging module input correspond to the positive and negative terminals of the bus connection, the positive terminal of each charging and discharging module output is connected with the positive terminal of the first battery through the first switch M1, the positive terminal of each charging and discharging module output is connected with the positive terminal of the second battery through the second switch M2, the negative terminal of each charging and discharging module output is connected with the negative terminal of the first battery and the negative terminal of the second battery, the total controller is connected with the first battery and the second battery, each charging and discharging module is provided with the module controller connected with the total controller,

[0034] Further, as shown in Figure 3, the charging and discharging module includes a first DC converter, a second DC converter, a first half-bridge unit and a second half-bridge unit, the positive and negative terminals of the first DC converter and the second DC converter input correspond to the positive and negative terminals of the bus connection, the positive terminal of the first DC converter output is connected with the first terminal of the first half-bridge unit input, the negative terminal of the first DC converter output is connected with the second terminal of the first half-bridge unit input and the first terminal of the second half-bridge unit input, the positive terminal of the second DC converter output is connected with the second terminal of the first half-bridge unit input and the first terminal of the second half-bridge unit input, the negative terminal of the second DC converter output is connected with the second terminal of the second half-bridge unit input, the midpoint output of the first half-bridge unit forms the positive terminal of the charging and discharging module output, and the midpoint output of the second half-bridge unit forms the negative terminal of the charging and discharging module output.

[0035] It can be understood that the first half-bridge unit includes the first switch tube S9 and the second switch tube S10 connected in series, the first switch tube S9 forms a first end of the first half-bridge unit input, the second switch tube S10 forms a second end of the first half-bridge unit input, and a connection of the first switch tube S9 and the second switch tube S10 forms a midpoint output of the first half-bridge unit.

[0036] It can be understood that the second half-bridge unit includes the third switch tube S11 and the fourth switch tube S12 connected in series, the third switch tube S11 forms a first end of the second half-bridge unit input, the fourth switch tube S12 forms a second end of the second half-bridge unit input, and a connection of the third switch tube S11 and the fourth switch tube S12 forms a midpoint output of the second half-bridge unit.

[0037] The control method comprises:

[0038] 101. Each module controller obtains a power-voltage derating curve of each charge-discharge module according to a current state of each charge-discharge module.

[0039] It can be understood that the current state of each charge-discharge module includes a temperature condition of a radiator, a fault condition of the module, and the like, and the above conditions will affect the power of the charge-discharge module. Therefore, the current power-voltage derating curve of the charge-discharge module can be obtained according to the current state of the module, but is not limited thereto.

[0040] 102. The total controller collects voltage information of the first battery and the second battery, and transmits the collected voltage information to each module controller.

[0041] It should be noted that in the embodiment, the operation 101 and the operation 102 are executed in sequence, but are not limited thereto. In some embodiments, the operation 101 and the operation 102 can be executed simultaneously or the operation 102 is executed first and then the operation 101 is executed.

[0042] 103. Each module controller determines power information of each charge-discharge module at a voltage of the first battery and at a voltage of the second battery according to the power-voltage derating curve of each charge-discharge module, and sends the determined power information to the total controller.

[0043] It can be understood that the maximum power that each charge-discharge module in the current state can output to the first battery or the second battery when connected to the first battery or the second battery can be determined through the power-voltage derating curve, and then the best charge-discharge module can be selected to be connected to the first battery and the second battery through a selected manner, so as to improve the charging efficiency of the charge-discharge system, but is not limited thereto.

[0044] 104、the total controller determines the connection relationship of each charging and discharging module with the first battery and the second battery according to the power information, and sends the connection relationship to each module controller correspondingly;

[0045] Further, the total controller determines the connection relationship of each charging and discharging module with the first battery and the second battery according to the power information, which includes:

[0046] 1041、sort the power information of each charging and discharging module at the voltage of the first battery, and sort the power information of each charging and discharging module at the voltage of the second battery;

[0047] The power information of each charging and discharging module at the voltage of the first battery and the voltage of the second battery is sorted, which facilitates the selection of the charging and discharging module with relatively large power to be connected with the battery, and is beneficial to improve the capacity utilization rate of the charging and discharging system.

[0048] 1042、select at least one charging and discharging module to be connected with the first battery according to the power demand of the first battery, and select at least one charging and discharging module to be connected with the second battery according to the power demand of the second battery;

[0049] It can be understood that the selection of each charging and discharging module needs to be combined with the sorting of the power information of the charging and discharging module and the power demand of the first battery and the second battery. First, the charging and discharging module with relatively large power in the sorting of the power information needs to be selected to be connected with the first battery and the second battery. Secondly, the charging and discharging module selected to be connected with the first battery and the charging and discharging module selected to be connected with the second battery need to be different. Thirdly, the power value output by the charging and discharging module selected to be connected with the first battery needs to be closest to the power demand of the first battery, and the power value output by the charging and discharging module selected to be connected with the second battery also needs to be closest to the power demand of the second battery, so as to realize the satisfaction of the output power required by the first battery and the second battery and the maximization of the capacity utilization rate of the charging and discharging system, but not limited thereto.

[0050] 1043、determine the connection relationship of each charging and discharging module with the first battery and the second battery according to the selected charging and discharging module.

[0051] The power output value of each charging and discharging module at the voltage of the battery is determined through the independent power-voltage drop curve of each charging and discharging module, which is beneficial to provide the charging efficiency of the charging and discharging system by determining the charging and discharging module connected with each battery port and the power output by the charging and discharging module in combination with the power demand of different battery types and voltage levels.

[0052] It can be understood that after the selection of the charging and discharging modules is completed, the total controller can determine the working mode of each charging and discharging module: the selected charging and discharging module needs to be in the corresponding working mode, and the unselected charging and discharging module needs to be in the shutdown mode, therefore, the total controller sends the connection relationship of each charging and discharging module with the first battery and the second battery to the corresponding module controller, so as to control the corresponding charging and discharging module to be in the corresponding working mode through each module controller, but not limited thereto.

[0053] 105、Each module controller controls the corresponding first switch M1 and the corresponding second switch M2 to be connected or disconnected according to the received connection relationship.

[0054] Further, "each module controller controls the corresponding first switch M1 and the corresponding second switch M2 to be connected or disconnected according to the received connection relationship" includes:

[0055] Each module controller performs one of the following operations according to the received connection relationship:

[0056] 1051, control the first switch M1 to be connected, and control the second switch M2 to be disconnected;

[0057] 1052, control the first switch M1 to be disconnected, and control the second switch M2 to be connected;

[0058] 1053, control the first switch M1 to be disconnected, and control the second switch M2 to be disconnected.

[0059] Each module controller realizes flexible selection of the output port of each charging and discharging module through control of the first switch M1 and the second switch M2, which is conducive to the charging and discharging system to charge the first battery and the second battery with the optimal output power.

[0060] It can be understood that the module controller corresponding to one or more charging and discharging modules connected with the first battery performs operation 1051 to make the corresponding charging and discharging module connected with the port of the first battery, and the module controller corresponding to one or more charging and discharging modules connected with the second battery performs operation 1052 to make the corresponding charging and discharging module connected with the port of the second battery, and the module controller of the remaining charging and discharging module performs operation 1053 to make the corresponding charging and discharging module shutdown, but not limited thereto.

[0061] It can be understood that, as shown in FIG. 2, the charging and discharging system includes a plurality of parallel DCDC charging and discharging modules, the input side of each charging and discharging module is connected with the input bus, the output side of each charging and discharging module is connected with the connection port of the first battery through the first switch M1, and is connected with the connection port of the second battery through the second switch M2, which is conducive to realizing flexible control of the working mode switching of each charging and discharging module by each module controller according to the connection relationship determined by the total controller, but not limited thereto.

[0062] It should be noted that the module controllers and the total controller can perform the charging and discharging system control method of the application in a timely manner, which is conducive to timely adjusting the connection of the first battery and the second battery with the output power optimal charging and discharging module, so as to improve the charging efficiency of the battery.

[0063] In the application, the connection relationship between each charging and discharging module and the first battery and the second battery is determined through the cooperation of the main controller and the module controllers. Each module controller is connected with the first battery through the first switch M1 and connected with the second battery through the second switch M2. Each module controller first obtains the power-voltage drop curve of each charging and discharging module according to the current state of each charging and discharging module, and then can determine the power of each charging and discharging module under the voltage of the first battery and under the voltage of the second battery according to the voltage of the first battery and the second battery collected by the total controller. The total controller determines the connection relationship between each charging and discharging module and the first battery and the second battery according to the above power information. Finally, through the module controller controlling the corresponding first switch M1 and the corresponding second switch M2 to be connected or disconnected, the first battery and the second battery can be flexibly switched to be connected with the optimal charging and discharging module and charged at the optimal charging power, thereby effectively improving the charging efficiency of the battery unit.

[0064] Embodiment two

[0065] Please refer to FIG. 1 and FIG. 4, the application discloses an electronic device, which comprises:

[0066] one or more processors 201;

[0067] one or more memories 202 for storing one or more programs, when the one or more programs are executed by the processor, the processor implements the charging and discharging system control method of the application as described above.

[0068] Embodiment three

[0069] The application embodiment discloses a computer readable storage medium, which stores a program. When the program is executed by a processor, the charging and discharging system control method of the application as described above is implemented.

[0070] Embodiment four

[0071] The application embodiment discloses a computer program product or a computer program, which comprises computer instructions stored in a computer readable storage medium. The processor of the electronic device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the electronic device executes the charging and discharging system control method of the application as described above.

[0072] It should be understood that, in the embodiments of the present application, the processor can be a central processing module (CPU), and the processor can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0073] Those of ordinary skill in the present art can understand that all or part of the processes in the above-mentioned embodiments can be completed by computer program instruction related hardware, and the program can be stored in a computer readable storage medium. When the program is executed, the program can include the processes of the above-mentioned embodiments. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM) or a random access memory (RAM), etc.

[0074] The above only describes the preferred embodiments of the present application, and of course cannot limit the scope of the present application. Therefore, equivalent changes made within the scope of the present patent are still within the scope of the present application.

Claims

1. A method for controlling a charge-discharge system with two batteries, the method comprising: providing a plurality of charge-discharge modules and a general controller, wherein each of the charge-discharge modules is connected to a positive terminal and a negative terminal of a bus, each of the charge-discharge modules is connected to a positive terminal of a first battery through a first switch, each of the charge-discharge modules is connected to a positive terminal of a second battery through a second switch, each of the charge-discharge modules is connected to a negative terminal of the first battery and a negative terminal of the second battery, the general controller is connected to the first battery and the second battery, and each of the charge-discharge modules is provided with a module controller connected to the general controller; obtaining, by each of the module controllers, a power-voltage degradation curve of each of the charge-discharge modules according to a current state of each of the charge-discharge modules; collecting, by the general controller, voltage information of the first battery and the second battery, and transmitting the collected voltage information to each of the module controllers; determining, by each of the module controllers, power information of each of the charge-discharge modules at a voltage of the first battery and at a voltage of the second battery according to the power-voltage degradation curve of each of the charge-discharge modules, and sending the determined power information to the general controller; determining, by the general controller, a connection relationship of each of the charge-discharge modules with the first battery and the second battery according to the power information, and sending the connection relationship to each of the module controllers; and controlling, by each of the module controllers, the corresponding first switch and the corresponding second switch to be connected or disconnected according to the received connection relationship. The step of controlling, by each of the module controllers, the corresponding first switch and the corresponding second switch to be connected or disconnected according to the received connection relationship comprises: performing, by each of the module controllers, one of the following operations according to the received connection relationship: controlling the first switch to be connected and the second switch to be disconnected; controlling the first switch to be disconnected and the second switch to be connected; and controlling the first switch to be disconnected and the second switch to be disconnected. The step of determining, by the general controller, the connection relationship of each of the charge-discharge modules with the first battery and the second battery according to the power information comprises: sorting the power information of each of the charge-discharge modules at the voltage of the first battery, and sorting the power information of each of the charge-discharge modules at the voltage of the second battery; selecting at least one of the charge-discharge modules to be connected to the first battery according to a power requirement of the first battery, and selecting at least one of the charge-discharge modules to be connected to the second battery according to a power requirement of the second battery; and determining the connection relationship of each of the charge-discharge modules with the first battery and the second battery according to the selected charge-discharge modules. ​ ​ ​ ​ ​ 2. The method according to claim 1, wherein ​ ​ ​ ​ ​ 3. The method according to claim 1, wherein ​ ​ ​ ​ 4. The method according to claim 1, wherein The charge-discharge module comprises a first DC converter, a second DC converter, a first half-bridge unit and a second half-bridge unit, the positive and negative terminals of the first DC converter and the second DC converter are connected with the positive and negative terminals of the bus, the positive terminal of the output of the first DC converter is connected with the first terminal of the input of the first half-bridge unit, the negative terminal of the output of the first DC converter is connected with the second terminal of the input of the first half-bridge unit and the first terminal of the input of the second half-bridge unit, the positive terminal of the output of the second DC converter is connected with the second terminal of the input of the first half-bridge unit and the first terminal of the input of the second half-bridge unit, the negative terminal of the output of the second DC converter is connected with the second terminal of the input of the second half-bridge unit, the midpoint of the first half-bridge unit is formed as the positive terminal of the output of the charge-discharge module, and the midpoint of the second half-bridge unit is formed as the negative terminal of the output of the charge-discharge module.

5. An electronic device, comprising: Comprise: one or more processors; one or more memories storing one or more programs, when the one or more programs are executed by the processor, the processor implements the charge-discharge system control method of the accessible double battery as claimed in any one of claims 1 to 4.

6. A computer-readable storage medium having stored thereon a program, characterized in that, The program is executed by the processor to implement the charge-discharge system control method of the accessible double battery as claimed in any one of claims 1 to 4.

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