An intelligent charging device for electric vehicles and a charging control method thereof

Abstract

The application discloses an intelligent charging device for an electric vehicle, wherein a circuit breaker is connected with an AC input plug, the output end of the circuit breaker is connected with an auxiliary power supply and a charging module respectively, the first output end of the auxiliary power supply is connected with a charging management unit for power supply of the charging management unit, the second output end of the auxiliary power supply is connected with a charging gun for power supply of an electric device of the electric vehicle, the output end of the charging module is connected with the charging gun, the charging management unit is connected with a mode selection switch for determining the control mode selected by the mode selection switch, and the charging management unit is connected with the charging module and the charging gun respectively for receiving the control instruction of a BMS or an upper computer to control the output of the charging module under the control mode selected by the mode selection switch. The application can realize flexible power supply output, can ensure the continuous work of the electric device of the electric vehicle when the power battery cannot be used, and has strong expansibility, universality and reliability.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and more specifically, to an intelligent charging device for electric vehicles and its charging control method. Background Technology

[0002] New energy electric vehicles generally use high-voltage battery packs as the energy source for the entire vehicle. The battery is recharged by onboard or offboard charging devices that convert AC power into high-voltage DC power. The high-voltage electrical equipment in the electric vehicle (such as air conditioning, DC / DC power supplies, and motor controllers) must draw power from the battery pack to operate normally. If the battery pack fails to supply power due to a malfunction or other problems, all high-voltage electrical equipment in the vehicle will cease to function.

[0003] Traditional chargers or charging stations are primarily used to charge power batteries. If the power battery is offline due to a fault or the initial voltage of the battery pack is too low, it will not output power, meaning it cannot supply electricity to the outside world, and high-voltage electrical equipment will not be able to work. This may lead to prolonged shutdowns of certain equipment (such as air conditioners not cooling), resulting in certain losses or damages.

[0004] Therefore, how to solve the problem of electric vehicle electrical equipment being unusable due to the failure of the power battery has become a technical problem that urgently needs to be solved and a key research focus for those skilled in the art. Summary of the Invention

[0005] To address the technical problem of electric vehicle electrical equipment becoming unusable due to the failure of the power battery, this invention innovatively provides an intelligent charging device for electric vehicles, offering a separate power supply for these devices. This invention enables flexible power output, ensuring continued operation of electric vehicle electrical equipment even when the power battery is unavailable, and exhibits strong scalability, versatility, and reliability.

[0006] To achieve the aforementioned technical objectives, this invention discloses an intelligent charging device for electric vehicles, comprising a housing. The housing is equipped with an AC input plug, a charging gun, and a mode selection switch. The housing contains a circuit breaker, a charging module, an auxiliary power supply, and a charging management unit. The input terminal of the circuit breaker is connected to the AC input plug, and its output terminal is connected to both the power input terminal of the auxiliary power supply and the input terminal of the charging module. The first output terminal of the auxiliary power supply is connected to the charging management unit to supply power to it. The second output terminal of the auxiliary power supply is connected to the charging gun to supply power to the electric vehicle's electrical equipment. The output terminal of the charging module is connected to the charging gun via a main output bus. The charging management unit is connected to the mode selection switch via an I / O interface to determine the control mode selected by the mode selection switch. The charging management unit is connected to both the charging module and the charging gun via a CAN bus to receive control commands from the BMS or a host computer to control the output of the charging module under the control mode selected by the mode selection switch.

[0007] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein the mode selection switch can select one of a remote control mode, a standard charging mode, and a constant voltage output mode. In the remote control mode, the charging management unit receives control signals from the host computer or BMS to control the charging module to supply power to the electric vehicle; in the standard charging mode, the charging management unit receives control signals from the BMS to control the charging module to charge the power battery of the electric vehicle; in the constant voltage output mode, the charging management unit receives the required constant voltage output parameters in advance, and then receives control signals from the host computer to control the charging module to supply constant voltage power to the electrical equipment of the electric vehicle.

[0008] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein the output end of the charging module is also connected to an insulation monitoring module, the insulation monitoring module being connected to a charging management unit via a CAN bus, and the charging management unit controlling the opening and closing of the insulation monitoring module via the CAN bus.

[0009] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein the charging modules are configured as multiple, and the multiple charging modules are connected in parallel. Each charging module is connected to a charging management unit via a CAN bus. The charging management unit controls the number of charging modules in use and the output voltage and current of each charging module through charging control commands to achieve current sharing.

[0010] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein each charging module is connected in series with a branch contactor, and the charging management unit controls the on / off state of the branch contactor to control the output of the corresponding charging module; a bus contactor is connected in series on the main output bus, and the charging management unit controls the on / off state of the bus contactor to control the charging circuit.

[0011] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein the bottom of the housing is provided with movable rollers, the side wall of the housing is provided with a telescopic push-pull rod, and the upper housing is also provided with a status indicator light and an LCD screen. The status indicator light and the LCD screen are respectively connected to the charging management unit through corresponding interfaces. The status indicator light includes a power indicator light, a charging indicator light and a fault indicator light, and the LCD screen is used to display charging information.

[0012] The present invention also provides a charging control method based on an intelligent charging device for electric vehicles, the charging control method comprising:

[0013] Connect the charging gun to the charging port of the electric vehicle;

[0014] Connect the AC input plug to an AC power outlet;

[0015] Close the circuit breaker to power on the charging device;

[0016] Initialize the charging management unit and charging module;

[0017] The auxiliary power supply provides power to the electrical equipment of the electric vehicle;

[0018] The control mode of the mode selection switch is read by the charging management unit, and the control mode includes remote control mode and local control mode;

[0019] In remote control mode, the charging management unit receives control signals from the host computer or BMS to control the charging module to supply power to the electric vehicle.

[0020] If in local control mode, the charging mode of the mode selection switch is read, which includes standard charging mode and constant voltage output mode.

[0021] In standard charging mode, the charging management unit receives control signals from the BMS to control the charging module to charge the electric vehicle's power battery.

[0022] In constant voltage output mode, the charging management unit receives the constant voltage output parameters to be set in advance, and then receives the control signal from the host computer to control the charging module to provide constant voltage power to the electrical equipment of the electric vehicle.

[0023] When the charging module receives a charging shutdown command, it shuts down the charging module output.

[0024] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein the charging start-up step is included in the remote control mode:

[0025] The charging management unit waits for control commands from the BMS or host computer.

[0026] The charging management unit configures charging parameters and generates a charging start command based on the received control instructions;

[0027] The charging management unit provides feedback on the charging preparation status through the I / O interface via status indicator lights and an LCD screen;

[0028] When the charging module receives a charging start command, it starts to supply power to the electric vehicle.

[0029] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein the charging start-up step in the standard charging mode includes the following:

[0030] Before charging begins, the charging management unit and BMS configure charging parameters and generate a charging start command through a charging handshake.

[0031] When the charging module receives a charging start command, it starts charging the power battery of the electric vehicle.

[0032] During the charging process, the charging management unit exchanges charging information with the BMS and displays it through status indicator lights and an LCD screen.

[0033] Furthermore, the present invention provides an intelligent charging device for electric vehicles, wherein in the constant voltage output mode, the following charging start-up steps are included:

[0034] The constant voltage output parameters are set by reading the requirements from the charging management unit.

[0035] The charging management unit sends the constant voltage output parameters to the charging module via the CAN bus.

[0036] After receiving the constant voltage output parameters, the charging module sends a message to the charging management unit that it is ready to charge.

[0037] When the charging management unit receives the charging preparation signal from the charging module, it sends a message to the host computer via the CAN bus that it is ready to charge.

[0038] When the charging management unit receives the start command sent by the host computer, the charging management unit sends a charging start command to the charging module.

[0039] When the charging module receives a charging start command, it starts to provide constant voltage power to the electrical equipment of the electric vehicle.

[0040] The beneficial effects of this invention are as follows: By connecting a circuit breaker to an AC input plug, and connecting the output of the circuit breaker to an auxiliary power supply and a charging module respectively; connecting the first output of the auxiliary power supply to a charging management unit for power supply to the charging management unit; and connecting the second output of the auxiliary power supply to a charging gun for power supply to the electrical equipment of the electric vehicle; connecting the output of the charging module to the charging gun; connecting the charging management unit to a mode selection switch for determining the control mode selected by the mode selection switch; and connecting the charging management unit to both the charging module and the charging gun for receiving control commands from the BMS or host computer to control the output of the charging module under the control mode selected by the mode selection switch, a highly versatile and reliable intelligent charging device for electric vehicles is constituted. The auxiliary power supply provides power to the internal and external devices of the charging device, the mode selection switch allows selection of multiple charging modes, and the charging management unit can flexibly control the power supply of the charging module according to the charging mode selected by the mode selection switch, achieving centralized management of charging control and output, and solving the problem that electrical equipment cannot continue to work when the power battery of an electric vehicle or electrical system is unusable. Attached Figure Description

[0041] Figure 1 This is a structural block diagram of an intelligent charging device for electric vehicles according to the present invention;

[0042] Figure 2 This is a schematic flowchart of a charging control method for an intelligent charging device for electric vehicles according to the present invention. Detailed Implementation

[0043] The following is a detailed explanation and description of an intelligent charging device for electric vehicles according to the present invention, with reference to the accompanying drawings.

[0044] like Figure 1As shown in the figure, this invention discloses an intelligent charging device for electric vehicles, including a housing 1. The housing 1 is equipped with an AC input plug 2, a charging gun 3, and a mode selection switch 4. Inside the housing 1 are a circuit breaker 5, a charging module 14, an auxiliary power supply 6, and a charging management unit 7. The input terminal of the circuit breaker 5 is connected to the AC input plug 2, and the output terminal of the circuit breaker 5 is connected to the power input terminal of the auxiliary power supply 6 and the input terminal of the charging module 14, respectively. The circuit breaker 5 is used to protect the charging circuit in the charging device from current overload, short circuit, and other faults, protecting the safety of the internal components of the charging device. The first output terminal of the auxiliary power supply 6 is connected to the charging management unit 7 to supply power to the charging management unit 7. The second output terminal of the auxiliary power supply 6 is connected to the charging gun 3 to supply power to the low-voltage electrical equipment of the electric vehicle (when the charging gun 3 is connected to the electric vehicle, it can supply power to the low-voltage electrical equipment of the electric vehicle; whether the low-voltage electrical equipment needs auxiliary power supply is not specified). Power is supplied by power supply 6 (which is selected autonomously by the low-voltage electrical equipment at the electric vehicle end); the charging module 14 adopts a standard charging module 14, which can provide standard voltage and current output, and the output voltage and current can be adjusted, so that the output terminal of the charging module 14 is connected to the charging gun 3 through the main output bus 8; the charging management unit 7 is connected to the mode selection switch 4 through the I / O interface, and is used to determine the control mode selected by the mode selection switch 4; the charging management unit 7 is connected to the charging module 14 and the charging gun 3 through the CAN bus respectively, and is used to receive control commands from the BMS or the host computer to control the output of the charging module 14 in the control mode selected by the mode selection switch 4.

[0045] In this embodiment, the auxiliary power supply 6 can be used to power the internal and external devices of the charging device, the mode selection switch 4 can be used to select multiple charging modes, and the charging management unit 7 can flexibly control the power supply of the charging module 14 according to the charging mode selected by the mode selection switch 4, so as to realize centralized management of charging control and output, and solve the problem that the electrical equipment cannot continue to work when the power battery of the electric vehicle or the electrical system is unusable.

[0046] In one embodiment of the present invention, the mode selection switch 4 is an electronic switch used to switch between different modes. In this embodiment, the mode selection switch 4 has three control modes, selectable from remote control mode, standard charging mode, and constant voltage output mode. In remote control mode, the charging management unit 7 receives control signals from the host computer or BMS to control the charging module 14 to supply power to the electric vehicle (including the electric vehicle's power battery and high-voltage electrical equipment). In standard charging mode, the charging management unit 7 receives control signals from the BMS to control the charging module 14 to charge the electric vehicle's power battery. In constant voltage output mode, the charging management unit 7 receives pre-set constant voltage output parameters, and then receives control signals from the host computer to control the charging module 14 to provide constant voltage power to the electric vehicle's high-voltage electrical equipment.

[0047] In this embodiment, three charging control modes are provided. The charging management unit 7 can control the output of the charging module 14 according to the control mode selected by the mode selection switch 4. The mode of the mode selection switch 4 can be adjusted to suit more usage scenarios. In the remote control mode and the standard charging mode, it is only used for charging. The difference between the two is that in the remote control mode, charging only starts when the host computer or BMS sends a charging start signal, while in the standard charging mode, it is used as a standard charger. In the constant voltage output mode, the charging module 14 outputs a stable voltage, which can be used to power the high-voltage electrical equipment of the electric vehicle when the power battery is unavailable or malfunctions.

[0048] In one embodiment of the present invention, the output terminal of the charging module 14 is further connected to an insulation monitoring module 9. The insulation monitoring module 9 is used to monitor the insulation status of the charging device, detect insulation faults, and provide graded alarms based on changes in insulation resistance to ensure the safe use of the charging device. The insulation monitoring module 9 is connected to the charging management unit 7 via a CAN bus, and the charging management unit 7 controls the opening and closing of the insulation monitoring module 9 via the CAN bus. In actual use, the insulation detection function of the insulation monitoring module 9 should be turned off before the charging device is started; during normal charging, the insulation detection function of the insulation monitoring module 9 should be activated.

[0049] In one embodiment of the present invention, multiple charging modules 14 are configured and connected in parallel to form a redundant design. If one charging module 14 fails, it does not affect the normal operation of the other charging modules 14. Each charging module 14 is connected to a charging management unit 7 via a CAN bus. The charging management unit 7 controls the number of charging modules 14 in use and the output voltage and current of each charging module 14 through charging control commands to achieve current sharing. When the output of a charging module 14 changes, the charging management unit 7 can adjust the duty cycle to achieve current sharing.

[0050] To facilitate the control of the on / off state of the output of each charging module 14, a branch contactor 10 is connected in series in each charging module 14. The charging management unit 7 controls the on / off state of the branch contactor 10 to control the on / off state of the output of the corresponding charging module 14. To facilitate the control of the on / off state of the total output, a bus contactor 11 is connected in series on the total output bus 8. The charging management unit 7 controls the on / off state of the bus contactor 11 to control the on / off state of the charging circuit (i.e., the circuit between the charging module 14 and the charging gun 3).

[0051] In this embodiment, both the branch contactor 10 and the bus contactor 8 are high-voltage DC contactors. The model and specifications of the contactors can be selected according to actual needs. The charging management unit 7 can control the number of charging modules 14 connected to the charging circuit by controlling the opening and closing of the branch contactor 10, and control the opening and closing of the entire charging circuit by controlling the opening and closing of the bus contactor 8.

[0052] In one embodiment of the present invention, to facilitate the movement and carrying of the charging device, casters are provided at the bottom of the housing 1, and a telescopic push-pull rod is provided on the side wall of the housing 1. To provide a clear view of detailed charging information during the charging process, a status indicator light 12 and an LCD screen 13 are also provided on the upper housing 1. The status indicator light 12 is connected to the I / O interface corresponding to the charging management unit 7, and the LCD screen 13 is connected to the serial port corresponding to the charging management unit 7. The status indicator light 12 includes a power indicator light, a charging indicator light, and a fault indicator light. The LCD screen 13 is used to display charging information, including data such as voltage, current, charging status, and power supply.

[0053] like Figure 2 As shown, this embodiment of the invention also provides a charging control method based on an intelligent charging device for electric vehicles, the charging control method comprising:

[0054] Connect the charging gun 3 to the charging port of the electric vehicle;

[0055] Connect the AC input plug 2 to the AC power outlet;

[0056] Close circuit breaker 5 to power on the charging device;

[0057] Initialize the charging management unit 7 and the charging module 14;

[0058] The auxiliary power supply 6 supplies power to the electrical equipment of the electric vehicle;

[0059] The charging management unit 7 reads the control mode of the mode selection switch 4, which includes remote control mode and local control mode.

[0060] In remote control mode, the charging management unit 7 receives control signals from the host computer or BMS to control the charging module 14 to supply power to the electric vehicle.

[0061] If in local control mode, read the charging mode of mode selection switch 4. The charging modes include standard charging mode and constant voltage output mode.

[0062] In standard charging mode, the charging management unit 7 receives the control signal from the BMS to control the charging module 14 to charge the power battery of the electric vehicle.

[0063] In constant voltage output mode, the charging management unit 7 receives the constant voltage output parameters to be set in advance, and then the charging management unit 7 receives the control signal from the host computer to control the charging module 14 to provide constant voltage power to the electrical equipment of the electric vehicle.

[0064] When the charging module 14 receives a charging shutdown command, it shuts down the output of the charging module 14.

[0065] In this embodiment, remote control and local control are selectable. During normal use, mode selection switch 4 is in the remote control position, controlled by an external host computer or BMS. The other two bits are local control bits, used to manually select between standard charging mode and constant voltage output mode. In constant voltage output mode, the electric vehicle's battery is not charged; instead, power is directly supplied to the vehicle's electrical equipment. These three charging control strategies can be selected autonomously to meet more usage needs. When the electric vehicle's battery is unusable, emergency power can be provided to the vehicle's electrical equipment.

[0066] More specifically, the remote control mode includes the following charging start-up steps:

[0067] Charging management unit 7 waits for control commands from BMS or host computer;

[0068] Charging management unit 7 configures charging parameters and generates charging start command according to the received control command;

[0069] The charging management unit 7 provides feedback on the charging preparation status information through the I / O interface via the status indicator light 12 and the LCD screen;

[0070] When the charging module 14 receives the charging start command, the charging module 14 starts to supply power to the electric vehicle.

[0071] More specifically, the standard charging mode includes the following charging initiation steps:

[0072] Before charging begins, the charging management unit 7 and the BMS configure the charging parameters and generate a charging start command through a charging handshake.

[0073] When the charging module 14 receives the charging start command, the charging module 14 starts to charge the power battery of the electric vehicle.

[0074] During the charging process, the charging management unit 7 exchanges charging information with the BMS and displays it through the status indicator light 12 and the LCD screen.

[0075] More specifically, the constant voltage output mode includes the following charging start-up steps:

[0076] The constant voltage output parameters are set by reading the charging management unit 7.

[0077] The charging management unit 7 sends the constant voltage output parameters to the charging module 14 via the CAN bus;

[0078] After receiving the constant voltage output parameters, the charging module 14 sends feedback to the charging management unit 7 that it is ready to charge.

[0079] When the charging management unit 7 receives the charging preparation signal from the charging module 14, it sends a message to the host computer via the CAN bus that it is ready to charge.

[0080] When the charging management unit 7 receives the start command sent by the host computer, the charging management unit 7 sends a charging start command to the charging module 14.

[0081] When the charging module 14 receives the charging start command, the charging module 14 starts to provide constant voltage power to the electrical equipment of the electric vehicle.

[0082] In constant voltage output mode, when the power battery of the electric vehicle is connected, if the charging request voltage of the BMS is lower than the power battery voltage, the charging device is in standby waiting for output; when the power battery voltage is lower than the charging request voltage, the charging device immediately starts output.

[0083] The above presents the specific control strategies for charging start-up under three charging control strategies. The charging module 14 + charging management unit 7 is used to realize centralized management of charging control and output. The optional charging control strategies provide flexible power output and solve the problem that high-voltage electrical equipment cannot continue to work when the power battery of an electric vehicle or electrical system is unavailable.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and simple improvements made on the substantive content of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent charging device for electric vehicles, characterized in that: The device includes a housing equipped with an AC input plug, a charging gun, and a mode selection switch. Inside the housing are a circuit breaker, a charging module, an auxiliary power supply, and a charging management unit. The circuit breaker's input is connected to the AC input plug, and its output is connected to both the auxiliary power supply's input and the charging module's input. The auxiliary power supply's first output is connected to the charging management unit to supply power, and its second output is connected to the charging gun to supply power to the electric vehicle's electrical equipment. The charging module's output is connected to the charging gun via a main output bus. The charging management unit is connected to the mode selection switch via an I / O interface to determine the selected control mode. The charging management unit is connected via a CAN bus. Connected to the charging module and charging gun respectively, it receives control commands from the BMS or host computer to control the output of the charging module in the control mode selected by the mode selection switch. The mode selection switch can select one of the following modes: remote control mode, standard charging mode, and constant voltage output mode. In remote control mode, the charging management unit receives control signals from the host computer or BMS to control the charging module to supply power to the electric vehicle. In standard charging mode, the charging management unit receives control signals from the BMS to control the charging module to charge the power battery of the electric vehicle. In constant voltage output mode, the charging management unit receives the required constant voltage output parameters in advance, and then receives control signals from the host computer to control the charging module to supply constant voltage power to the electrical equipment of the electric vehicle.

2. The intelligent charging device for electric vehicles according to claim 1, characterized in that: The output of the charging module is also connected to an insulation monitoring module. The insulation monitoring module is connected to the charging management unit via a CAN bus, and the charging management unit controls the opening and closing of the insulation monitoring module via the CAN bus.

3. The intelligent charging device for electric vehicles according to claim 2, characterized in that: The charging module is configured as multiple modules, which are connected in parallel. Each charging module is connected to the charging management unit via a CAN bus. The charging management unit controls the number of charging modules in use and the output voltage and current of each charging module through charging control commands to achieve current sharing.

4. The intelligent charging device for electric vehicles according to claim 3, characterized in that: Each of the charging modules is connected in series with a branch contactor. The charging management unit controls the on / off state of the branch contactor to control the output of the corresponding charging module. A bus contactor is connected in series on the main output bus. The charging management unit controls the on / off state of the bus contactor to control the charging circuit.

5. The intelligent charging device for electric vehicles according to claim 4, characterized in that: The bottom of the housing is equipped with movable casters, and the side wall of the housing is equipped with a telescopic push-pull rod. The upper housing is also equipped with status indicator lights and an LCD screen. The status indicator lights and the LCD screen are respectively connected to the charging management unit through corresponding interfaces. The status indicator lights include a power indicator light, a charging indicator light, and a fault indicator light. The LCD screen is used to display charging information.

6. A charging control method based on the intelligent charging device for electric vehicles according to claim 1, characterized in that: The charging control method includes: Connect the charging gun to the charging port of the electric vehicle; Connect the AC input plug to an AC power outlet; Close the circuit breaker to power on the charging device; Initialize the charging management unit and charging module; The auxiliary power supply provides power to the electrical equipment of the electric vehicle; The control mode of the mode selection switch is read by the charging management unit, and the control mode includes remote control mode and local control mode; In remote control mode, the charging management unit receives control signals from the host computer or BMS to control the charging module to supply power to the electric vehicle. If in local control mode, the charging mode of the mode selection switch is read, which includes standard charging mode and constant voltage output mode. In standard charging mode, the charging management unit receives control signals from the BMS to control the charging module to charge the electric vehicle's power battery. In constant voltage output mode, the charging management unit receives the constant voltage output parameters to be set in advance, and then receives the control signal from the host computer to control the charging module to provide constant voltage power to the electrical equipment of the electric vehicle. When the charging module receives a charging shutdown command, it shuts down the charging module output.

7. The charging control method according to claim 6, characterized in that: The remote control mode includes the following charging start-up steps: The charging management unit waits for control commands from the BMS or host computer. The charging management unit configures charging parameters and generates a charging start command based on the received control instructions; The charging management unit provides feedback on the charging preparation status through the I / O interface via status indicator lights and an LCD screen; When the charging module receives a charging start command, it starts to supply power to the electric vehicle.

8. The charging control method according to claim 6, characterized in that: The standard charging mode includes the following charging start-up steps: Before charging begins, the charging management unit and BMS configure charging parameters and generate a charging start command through a charging handshake. When the charging module receives a charging start command, it starts charging the power battery of the electric vehicle. During the charging process, the charging management unit exchanges charging information with the BMS and displays it through status indicator lights and an LCD screen.

9. The charging control method according to claim 6, characterized in that: The constant voltage output mode includes the following charging start-up steps: The constant voltage output parameters are set by reading the requirements from the charging management unit. The charging management unit sends the constant voltage output parameters to the charging module via the CAN bus. After receiving the constant voltage output parameters, the charging module sends a message to the charging management unit that it is ready to charge. When the charging management unit receives the charging preparation signal from the charging module, it sends a message to the host computer via the CAN bus that it is ready to charge. When the charging management unit receives the start command sent by the host computer, the charging management unit sends a charging start command to the charging module. When the charging module receives a charging start command, it starts to provide constant voltage power to the electrical equipment of the electric vehicle.

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