Charging and discharging system control method and apparatus allowing for connection of both high-voltage and low-voltage batteries

Abstract

A charging and discharging system control method and apparatus allowing for connection of both high-voltage and low-voltage batteries. At least one charging and discharging module is provided, and each charging and discharging module comprises a first direct-current converter, a second direct-current converter, a first half-bridge unit, and a second half-bridge unit. The control method comprises: on the basis of the connection of a high-voltage battery and a low-voltage battery, controlling the first half-bridge unit to be turned on or off, and controlling the second half-bridge unit to be turned on or off, such that when both the high-voltage battery and the low-voltage battery are connected, both the first direct-current converter and the second direct-current converter operate, when only the high-voltage battery is connected, both the first direct-current converter and the second direct-current converter operate, and when only the low-voltage battery is connected, only the second direct-current converter operates. In the charging and discharging system control method allowing for connection of both high-voltage and low-voltage batteries of the present application, simultaneous connection of high-voltage and low-voltage batteries can be achieved by means of a heterogeneous topology of half-bridge units, and the number of direct-current converters connected is also controlled , thereby meeting charging requirements for connection of different batteries.

Description

Charging and discharging system control method and device capable of accessing high and low voltage batteries TECHNICAL FIELD

[0001] The present application relates to the technical field of charging and discharging system control, in particular to a charging and discharging system control method and device capable of accessing high and low voltage batteries. BACKGROUND

[0002] For battery energy storage, charging piles and vehicle-to-grid (V2G) application fields, in order to be able to simultaneously access different types and different voltage level energy storage batteries and electric vehicles, the battery charging and discharging system needs to be configured with multiple single output DCDC charging and discharging modules, and additional solid state switches and relays are needed to realize the simultaneous access of different types and different voltage level battery units. The charging and discharging system connection structure is complex, and at the same time, the circuit loss, the volume of the charging and discharging module and the cost of the charging and discharging system are increased.

[0003] SUMMARY

[0004] The purpose of the present application is to provide a charging and discharging system control method and device capable of accessing high and low voltage batteries, which realizes the simultaneous access of high voltage batteries and low voltage batteries through the topology of half bridge units, and controls the number of DC converters connected with the battery units to meet the charging demand when accessing different types and different voltage level batteries, without the need to increase additional elements, which is beneficial to reduce circuit loss and system cost.

[0005] In order to achieve the above purpose, the present application discloses a charging and discharging system control method capable of accessing high and low voltage batteries, which provides at least one charging and discharging module, each of the charging and discharging modules 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 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 negative terminal of the high voltage battery and the negative terminal of the low voltage battery, the midpoint output of the first half bridge unit is connected with the positive terminal of the high voltage battery, the midpoint output of the second half bridge unit is connected with the positive terminal of the low voltage battery,

[0006] The steps of the control method include:

[0007] S101, judge whether the high-voltage battery and the low-voltage battery are connected, if the high-voltage battery and the low-voltage battery are connected, execute step S102; if only the high-voltage battery is connected, execute step S104; if only the low-voltage battery is connected, execute step S106; if the high-voltage battery and the low-voltage battery are not connected, execute step S108;

[0008] S102, control the first end and the second end of the first half-bridge unit input to be conducted, and control the first end and the second end of the second half-bridge unit input to be conducted;

[0009] S103, judge whether the high-voltage battery is disconnected and the low-voltage battery is disconnected, if the low-voltage battery is disconnected, execute step S104, if the high-voltage battery is disconnected, execute step S106;

[0010] S104, control the first end and the second end of the first half-bridge unit input to be conducted, and control the first end and the second end of the second half-bridge unit input to be disconnected;

[0011] S105, judge whether the high-voltage battery is disconnected and the low-voltage battery is connected, if the high-voltage battery is disconnected, execute step S108, if the low-voltage battery is connected, return to execute step S102;

[0012] S106, control the first end and the second end of the first half-bridge unit input to be disconnected, and control the first end and the second end of the second half-bridge unit input to be conducted;

[0013] S107, judge whether the low-voltage battery is disconnected and the high-voltage battery is connected, if the low-voltage battery is disconnected, execute step S108, if the high-voltage battery is connected, return to execute step S102.

[0014] S108, control the first end and the second end of the first half-bridge unit input to be disconnected, and control the first end and the second end of the second half-bridge unit input to be disconnected, and return to execute step S101.

[0015] Further, the first half-bridge unit includes a first switch tube and a second switch tube connected in series, the first switch tube forms the first end of the first half-bridge unit input, the second switch tube forms the second end of the first half-bridge unit input, and the connection of the first switch tube and the second switch tube forms the midpoint output of the first half-bridge unit.

[0016] Further, the second half-bridge unit includes a third switch tube and a fourth switch tube connected in series, the third switch tube forms the first end of the second half-bridge unit input, the fourth switch tube forms the second end of the second half-bridge unit input, and the connection of the third switch tube and the fourth switch tube forms the midpoint output of the second half-bridge unit.

[0017] Further, the first DC converter and the second DC converter each include four groups of control units and transformers, each of the control units includes two control switch tubes in series, the midpoints of the four groups of control units are respectively connected with the input positive terminal, the input negative terminal, the output positive terminal and the output negative terminal of the transformers, two groups of the control units connected with the input positive terminal and the input negative terminal are in parallel, and the two ends thereof form the positive terminal and the negative terminal of the input of the first DC converter and the second DC converter respectively, two groups of the control units connected with the output positive terminal and the output negative terminal are in parallel, and the two ends thereof form the positive terminal and the negative terminal of the output of the first DC converter and the second DC converter respectively.

[0018] Further, when a plurality of the charge-discharge modules are provided, the midpoint output of the first half-bridge unit of each of the charge-discharge modules is connected with the positive terminal of the high-voltage battery, the midpoint output of the second half-bridge unit of each of the charge-discharge modules is connected with the positive terminal of the low-voltage battery, and the negative terminal of the output of the second DC converter of each of the charge-discharge modules is connected with the negative terminal of the high-voltage battery and the negative terminal of the low-voltage battery.

[0019] Further, the charge-discharge module further includes a second-order filter circuit, the second-order filter circuit includes two inductors and two capacitors, the two inductors are in series connection between the midpoint output of the first half-bridge unit and the midpoint output of the second half-bridge unit, one end of the two capacitors is connected with the two inductors, and the other end thereof is connected with the negative terminal of the output of the second DC converter.

[0020] To achieve the above object, the application discloses a charge-discharge system control device which can access high-voltage and low-voltage batteries, and the device comprises:

[0021] A first judging module is configured to judge whether the high-voltage battery and the low-voltage battery are accessed or not.

[0022] A first control module is configured to control the first end and the second end of the input of the first half-bridge unit to be conducted, and control the first end and the second end of the input of the second half-bridge unit to be conducted.

[0023] A second judging module is configured to judge whether the high-voltage battery is exited or not and whether the low-voltage battery is accessed or not.

[0024] A second control module is configured to control the first end and the second end of the input of the first half-bridge unit to be conducted, and control the first end and the second end of the input of the second half-bridge unit to be disconnected.

[0025] A third judging module is configured to judge whether the high-voltage battery is exited or not and whether the low-voltage battery is accessed or not.

[0026] The third control module is configured to control the first end and the second end of the first half-bridge unit to be disconnected, and control the first end and the second end of the second half-bridge unit to be conducted.

[0027] The fourth judging module is configured to judge whether the low-voltage battery is withdrawn or the high-voltage battery is connected.

[0028] The fourth control module is configured to control the first end and the second end of the first half-bridge unit to be disconnected, and control the first end and the second end of the second half-bridge unit to be disconnected.

[0029] To achieve the above object, the present application discloses an electronic device, which comprises:

[0030] one or more processors;

[0031] 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 charging and discharging system control method of the high and low voltage batteries as described above.

[0032] 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 charging and discharging system control method of the high and low voltage batteries as described above is implemented.

[0033] In the present application, the topology of the first half-bridge unit and the second half-bridge unit in the charging and discharging module is used to realize the simultaneous connection of the high-voltage battery and the low-voltage battery, and according to the connection of the high-voltage battery and the low-voltage battery, the first half-bridge unit is controlled to be conducted or disconnected, and the second half-bridge unit is controlled to be conducted or disconnected, so that when the high-voltage battery and the low-voltage battery are connected, the first direct current converter and the second direct current converter are both working, when only the high-voltage battery is connected, the first direct current converter and the second direct current converter are both working, and when only the low-voltage battery is connected, only the second direct current converter is working, which realizes the adaptation of the connection of the high-voltage battery and the low-voltage battery by controlling the number of direct current converters connected with the battery unit, and further meets the charging demand when connecting different types and different voltage levels of batteries, and without increasing additional elements, which is beneficial to reduce the circuit loss and system cost. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 is a flow chart of the charging and discharging system control method of the high and low voltage batteries in the present application.

[0035] Fig. 2 is a structural schematic diagram of the charging and discharging system in the charging and discharging system control method of the high and low voltage batteries in the present application.

[0036] Fig. 3 is a circuit structure diagram of the charging and discharging module after step 102 is executed in the charging and discharging system control method of the high and low voltage batteries in the present application.

[0037] Figure 4 is a circuit structure diagram of the charge-discharge module after step 104 in the charge-discharge system control method of the application.

[0038] Figure 5 is a circuit structure diagram of the charge-discharge module after step 106 in the charge-discharge system control method of the application.

[0039] Figure 6 is a module diagram of the charge-discharge system control device of the application.

[0040] Figure 7 is a system diagram of the electronic device of the application. DETAILED DESCRIPTION

[0041] To explain the technical content, structural features, achieved purposes and effects of the application in detail, the following describes the embodiments in conjunction with the drawings.

[0042] Embodiment One

[0043] Referring to Figures 1 to 5, the application discloses a charge-discharge system control method that can access high and low voltage batteries, and provides at least one charge-discharge module. Each charge-discharge 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 input of the first DC converter and the second DC converter are connected to the positive and negative terminals of the bus, respectively. The positive terminal of the output of the first DC converter is connected to 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 to 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 to 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 to the second terminal of the input of the second half-bridge unit, the negative terminal of the high voltage battery and the negative terminal of the low voltage battery. The midpoint output of the first half-bridge unit is connected to the positive terminal of the high voltage battery. The midpoint output of the second half-bridge unit is connected to the positive terminal of the low voltage battery.

[0044] It can be understood that the first DC converter and the second DC converter are isolated stage DC converters. The input sides of the first DC converter and the second DC converter are connected in parallel to the input bus, respectively. The output sides of the first DC converter and the second DC converter are connected in series. The input side of the first half-bridge unit is connected in parallel to the output side of the first DC converter. The input side of the second half-bridge unit is connected in parallel to the output side of the second DC converter. However, the application is not limited in this regard.

[0045] Further, the first half-bridge unit comprises a first switch S9 and a second switch S10 connected in series, the first switch S9 forms a first end of the first half-bridge unit input, the second switch S10 forms a second end of the first half-bridge unit input, and a connection between the first switch S9 and the second switch S10 forms a midpoint output of the first half-bridge unit.

[0046] Further, the second half-bridge unit comprises a third switch S11 and a fourth switch S12 connected in series, the third switch S11 forms a first end of the second half-bridge unit input, the fourth switch S12 forms a second end of the second half-bridge unit input, and a connection between the third switch S11 and the fourth switch S12 forms a midpoint output of the second half-bridge unit.

[0047] Further, the first DC converter and the second DC converter each comprise four groups of control units and transformers, each group of control units comprises two control switches connected in series, the midpoints of the four groups of control units are respectively connected to the input positive end, the input negative end, the output positive end and the output negative end of the transformers, the two groups of control units connected to the input positive end and the input negative end are connected in parallel, and the two ends thereof form the positive end and the negative end of the first DC converter and the second DC converter inputs respectively, the two groups of control units connected to the output positive end and the output negative end are connected in parallel, and the two ends thereof form the positive end and the negative end of the first DC converter and the second DC converter outputs respectively.

[0048] The steps of the control method comprise:

[0049] S101, judge whether the high-voltage battery and the low-voltage battery are connected or not, if both the high-voltage battery and the low-voltage battery are connected, execute step S102; if only the high-voltage battery is connected, execute step S104; if only the low-voltage battery is connected, execute step S106; if neither the high-voltage battery nor the low-voltage battery is connected, execute step S108;

[0050] It can be understood that according to the actual connection of the high-voltage battery and the low-voltage battery, the switching state of the battery side half-bridge unit in the charge and discharge module circuit is controlled to flexibly switch the DCDC charge and discharge module to the corresponding working mode, but not limited thereto.

[0051] S102, control the first end and the second end of the first half-bridge unit input to be conductive, and control the first end and the second end of the second half-bridge unit input to be conductive;

[0052] It can be understood that, as shown in FIG. 3, when both the high-voltage battery and the low-voltage battery are connected, the first switch S9 and the second switch S10 of the first half-bridge unit are controlled to be high-frequency complementary conduction, and the third switch S11 and the fourth switch S12 of the second half-bridge unit are controlled to be high-frequency complementary conduction, so that the control switches of the first DC converter and the control switches of the second DC converter are all high-frequency action, and then the working mode of the charging and discharging module is switched to the mode that both the first DC converter and the second DC converter work to charge the high-voltage battery and the low-voltage battery, but not limited thereto.

[0053] S103, judge whether the high-voltage battery is withdrawn and the low-voltage battery is withdrawn, if the low-voltage battery is withdrawn, execute step S104, if the high-voltage battery is withdrawn, execute step S106;

[0054] It can be understood that, in the case that both the high-voltage battery and the low-voltage battery are connected, when one of the high-voltage battery and the low-voltage battery is withdrawn, the switch of the corresponding half-bridge unit needs to be turned off to switch the working mode of the charging and discharging module, but not limited thereto.

[0055] S104, control the first end and the second end of the input of the first half-bridge unit to be conduction, and control the first end and the second end of the input of the second half-bridge unit to be disconnected;

[0056] It can be understood that, as shown in FIG. 4, when only the high-voltage battery is connected, the first switch S9 and the second switch S10 of the first half-bridge unit are controlled to be high-frequency complementary conduction, and the third switch S11 and the fourth switch S12 of the second half-bridge unit are controlled to be off, so that the control switches of the first DC converter and the control switches of the second DC converter are high-frequency action, and then the working mode of the charging and discharging module is switched to the mode that both the first DC converter and the second DC converter work to charge the high-voltage battery, but not limited thereto.

[0057] S105, judge whether the high-voltage battery is withdrawn and the low-voltage battery is connected, if the high-voltage battery is withdrawn, execute step S108, if the low-voltage battery is connected, return to execute step S102;

[0058] It can be understood that, in the case that the high-voltage battery is connected, when the high-voltage battery is withdrawn, the charging and discharging system needs to be controlled to stop working, and when the low-voltage battery is connected, the working mode of the charging and discharging module needs to be switched to the mode that both the first DC converter and the second DC converter work, but not limited thereto.

[0059] S106, control the first end and the second end of the input of the first half-bridge unit to be disconnected, and control the first end and the second end of the input of the second half-bridge unit to be conduction;

[0060] It can be understood that, as shown in FIG. 5, only when the low-voltage battery is connected, the first switch S9 and the second switch S10 of the first half-bridge unit are controlled to be turned off, and the third switch S11 and the fourth switch S12 of the second half-bridge unit are controlled to be turned on in a high-frequency complementary manner, so that the control switches of the first DC converter are turned off and the control switches of the second DC converter are turned on in a high-frequency manner, and then the mode of only the second DC converter working is switched to charge the low-voltage battery, but the application is not limited thereto.

[0061] In S107, it is judged whether the low-voltage battery is disconnected or the high-voltage battery is connected. If the low-voltage battery is disconnected, S108 is executed. If the high-voltage battery is connected, S102 is executed.

[0062] It can be understood that, in the case of connecting the low-voltage battery, when the low-voltage battery is disconnected, the charging and discharging system needs to be controlled to stop working, and when the high-voltage battery is connected, the mode of both the first DC converter and the second DC converter working is switched to, but the application is not limited thereto.

[0063] In S108, the first end and the second end of the input of the first half-bridge unit are controlled to be disconnected, and the first end and the second end of the input of the second half-bridge unit are controlled to be disconnected, and then S101 is executed.

[0064] It can be understood that, when the low-voltage battery and the high-voltage battery are connected, the first switch S9 and the second switch S10 of the first half-bridge unit and the third switch S11 and the fourth switch S12 of the second half-bridge unit are controlled to be turned off, so that the control switches of the first DC converter and the second DC converter are turned off, the charging and discharging system stops working and waits for the reconnection of the battery, but the application is not limited thereto.

[0065] Further, when a plurality of charging and discharging modules are provided, the midpoint output of the first half-bridge unit of each charging and discharging module is connected to the positive electrode end of the high-voltage battery, the midpoint output of the second half-bridge unit of each charging and discharging module is connected to the positive electrode end of the low-voltage battery, and the negative electrode end of the output of the second DC converter of each charging and discharging module is connected to the negative electrode end of the high-voltage battery and the negative electrode end of the low-voltage battery.

[0066] It can be understood that, as shown in FIG. 2, in the embodiment, the charging and discharging system is configured with a plurality of single-output DCDC charging and discharging modules connected in parallel, the DC converters of the charging and discharging modules are respectively connected to the input bus, and the half-bridge units are respectively connected to the battery units of different voltage levels, so that the number of DC converters connected to the battery units through the half-bridge units is flexibly controlled according to the connection of the battery units, thereby effectively improving the charging efficiency and charging safety of the battery units.

[0067] Further, the charge-discharge module further comprises a second-order filter circuit, the second-order filter circuit comprising two inductors and two capacitors, the two inductors being connected in series between the midpoint output of the first half-bridge unit and the midpoint output of the second half-bridge unit, and one end of the two capacitors being connected with the two inductors and the other end of the two capacitors being connected with the negative terminal of the output of the second DC converter.

[0068] It can be understood that the midpoint output of the first half-bridge unit and the midpoint output of the second half-bridge unit are both provided with a second-order filter network composed of an inductor and a capacitor between the midpoint output of the first half-bridge unit and the midpoint output of the second half-bridge unit and the negative terminal of the output of the second DC converter to form access ports of the high-voltage battery and the low-voltage battery, but not limited thereto.

[0069] In the present application, the simultaneous access of the high-voltage battery and the low-voltage battery is realized by the topology isomerization of the first half-bridge unit and the second half-bridge unit in the charge-discharge module, and according to the access of the high-voltage battery and the low-voltage battery, the first half-bridge unit is controlled to be turned on or turned off, and the second half-bridge unit is controlled to be turned on or turned off, so that when the high-voltage battery and the low-voltage battery are both accessed, the first DC converter and the second DC converter both work, when only the high-voltage battery is accessed, the first DC converter and the second DC converter both work, and when only the low-voltage battery is accessed, only the second DC converter works, thereby realizing the adaptation of the access of the high-voltage battery and the low-voltage battery by controlling the number of DC converters connected with the battery units, further satisfying the charging demand when accessing different types and different voltage levels of batteries, and without the need of adding additional elements, which is conducive to reducing circuit loss and system cost.

[0070] Embodiment two

[0071] Please refer to FIG. 1 and FIG. 6, the present application discloses a charge-discharge system control device capable of accessing high and low voltage batteries, which comprises:

[0072] The first judgment module 201 is used for judging whether the high-voltage battery and the low-voltage battery are accessed or not;

[0073] The first control module 202 is used for controlling the first end and the second end of the input of the first half-bridge unit to be turned on, and controlling the first end and the second end of the input of the second half-bridge unit to be turned on;

[0074] The second judgment module 203 is used for judging whether the high-voltage battery is exited or not and whether the low-voltage battery is accessed or not;

[0075] The second control module 204 is used for controlling the first end and the second end of the input of the first half-bridge unit to be turned on, and controlling the first end and the second end of the input of the second half-bridge unit to be turned off;

[0076] The third judgment module 205 is used for judging whether the high-voltage battery is exited or not and whether the low-voltage battery is accessed or not;

[0077] The third control module 206 is configured to control the first end and the second end of the input of the first half-bridge unit to be disconnected, and control the first end and the second end of the input of the second half-bridge unit to be conducted.

[0078] The fourth judging module 207 is configured to judge whether the low-voltage battery is withdrawn and whether the high-voltage battery is accessed.

[0079] The fourth control module 208 is configured to control the first end and the second end of the input of the first half-bridge unit to be disconnected, and control the first end and the second end of the input of the second half-bridge unit to be disconnected.

[0080] Embodiment three

[0081] Referring to FIG. 1 and FIG. 7, the present application discloses an electronic device, which comprises:

[0082] one or more processors 301;

[0083] one or more memories 302 configured to store 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 high and low voltage batteries which can be accessed as described above.

[0084] Embodiment four

[0085] The embodiments of the present application disclose a computer readable storage medium, which stores a program. When the program is executed by a processor, the processor implements the charging and discharging system control method of the high and low voltage batteries which can be accessed as described above.

[0086] Embodiment five

[0087] The embodiments of the present application disclose 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 high and low voltage batteries which can be accessed as described above.

[0088] 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.

[0089] 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.

[0090] 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 of high and low voltage batteries, the method comprising: providing at least one charge-discharge module, each of the charge-discharge module comprising a first DC converter, a second DC converter, a first half-bridge unit and a second half-bridge unit, wherein the positive and negative terminals of the first DC converter and the second DC converter are connected to the positive and negative terminals of a bus, the positive terminal of the output of the first DC converter is connected to 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 to 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 to 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 to the second terminal of the input of the second half-bridge unit, the negative terminal of a high voltage battery and the negative terminal of a low voltage battery, the midpoint output of the first half-bridge unit is connected to the positive terminal of the high voltage battery, and the midpoint output of the second half-bridge unit is connected to the positive terminal of the low voltage battery; and controlling the method comprising: S101, judging whether the high voltage battery and the low voltage battery are connected, if both the high voltage battery and the low voltage battery are connected, executing step S102, if only the high voltage battery is connected, executing step S104, if only the low voltage battery is connected, executing step S106, and if neither the high voltage battery nor the low voltage battery is connected, executing step S108; S102, controlling the first terminal and the second terminal of the input of the first half-bridge unit to be conductive, and controlling the first terminal and the second terminal of the input of the second half-bridge unit to be conductive; S103, judging whether the high voltage battery is disconnected and the low voltage battery is disconnected, if the low voltage battery is disconnected, executing step S104, if the high voltage battery is disconnected, executing step S106; S104, controlling the first terminal and the second terminal of the input of the first half-bridge unit to be conductive, and controlling the first terminal and the second terminal of the input of the second half-bridge unit to be disconnected; S105, judging whether the high voltage battery is disconnected and the low voltage battery is connected, if the high voltage battery is disconnected, executing step S108, if the low voltage battery is connected, returning to execute step S102; S106, controlling the first terminal and the second terminal of the input of the first half-bridge unit to be disconnected, and controlling the first terminal and the second terminal of the input of the second half-bridge unit to be conductive; S107, judging whether the low voltage battery is disconnected and the high voltage battery is connected, if the low voltage battery is disconnected, executing step S108, if the high voltage battery is connected, returning to execute step S102; and S108, controlling the first terminal and the second terminal of the input of the first half-bridge unit to be disconnected, and controlling the first terminal and the second terminal of the input of the second half-bridge unit to be disconnected, and returning to execute step S101. The first half-bridge unit comprises a first switch and a second switch connected in series, the first switch forms the first terminal of the input of the first half-bridge unit, the second switch forms the second terminal of the input of the first half-bridge unit, and the connection of the first switch and the second switch forms the midpoint output of the first half-bridge unit. ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The method of claim 1, wherein, ​ 3. The method of claim 1, wherein the method further comprises: The second half-bridge unit comprises a third switch tube and a fourth switch tube connected in series, the third switch tube is formed as a first end of an input of the second half-bridge unit, the fourth switch tube is formed as a second end of the input of the second half-bridge unit, and a connection of the third switch tube and the fourth switch tube is formed as a midpoint output of the second half-bridge unit.

4. The method of claim 1, wherein the method further comprises: The first DC converter and the second DC converter each comprise four groups of control units and transformers, each of the four groups of control units comprises two control switch tubes connected in series, midpoints of the four groups of control units are connected with input positive terminals, input negative terminals, output positive terminals and output negative terminals of the transformers respectively, two groups of the control units connected with the input positive terminals and the input negative terminals are connected in parallel, and two ends of the two groups of the control units are formed as positive terminals and negative terminals of inputs of the first DC converter and the second DC converter respectively, two groups of the control units connected with the output positive terminals and the output negative terminals are connected in parallel, and two ends of the two groups of the control units are formed as positive terminals and negative terminals of outputs of the first DC converter and the second DC converter respectively.

5. The method of claim 1, wherein the method further comprises: When a plurality of the charge-discharge modules are provided, the midpoint output of the first half-bridge unit of each of the charge-discharge modules is connected with a positive terminal of a high-voltage battery, the midpoint output of the second half-bridge unit of each of the charge-discharge modules is connected with a positive terminal of a low-voltage battery, and the negative terminal of the output of the second DC converter of each of the charge-discharge modules is connected with a negative terminal of the high-voltage battery and a negative terminal of the low-voltage battery.

6. The method of claim 1, wherein the method further comprises: The charge-discharge module further comprises a second-order filter circuit, the second-order filter circuit comprises two inductors and two capacitors, the two inductors are connected in series at the midpoint output of the first half-bridge unit and the midpoint output of the second half-bridge unit, one end of the two capacitors is connected with the two inductors, and the other end of the two capacitors is connected with the negative terminal of the output of the second DC converter.

7. A charge-discharge system control device capable of accessing high and low voltage batteries, characterized by, Comprise: A first judging module for judging whether a high-voltage battery and a low-voltage battery are connected or not; A first control module for controlling the first end and the second end of the input of the first half-bridge unit to be turned on, and controlling the first end and the second end of the input of the second half-bridge unit to be turned on; A second judging module for judging whether the high-voltage battery is disconnected or the low-voltage battery is disconnected; A second control module for controlling the first end and the second end of the input of the first half-bridge unit to be turned on, and controlling the first end and the second end of the input of the second half-bridge unit to be turned off; A third judging module for judging whether the high-voltage battery is disconnected or the low-voltage battery is connected; A third control module for controlling the first end and the second end of the input of the first half-bridge unit to be turned off, and controlling the first end and the second end of the input of the second half-bridge unit to be turned on; A fourth judging module for judging whether the low-voltage battery is disconnected or the high-voltage battery is connected. A fourth control module for controlling the first end and the second end of the input of the first half-bridge unit to be turned off, and controlling the first end and the second end of the input of the second half-bridge unit to be turned off.

8. An electronic device, comprising: Comprise: One or more processors; One or more memories for storing one or more programs which, when executed by the processor, cause the processor to implement the method of claim 1 to 6.

9. A computer-readable storage medium having stored thereon a program, characterized in that, The program, when executed by the processor, implements the method of claim 1 to 6.

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