Energy conversion device and vehicle

Abstract

The present invention discloses an energy conversion device and a vehicle, comprising: a battery connection circuit, including a battery positive connection terminal, a battery negative connection terminal, a main positive switch and a main negative switch; a motor module, including an inverter and motor windings, the motor windings including three-phase windings, the first ends of the three-phase windings being connected to each other, and the second ends of the three-phase windings being respectively connected to the neutral points of the three-phase bridge arms of the inverter; a charging and power distribution module, having a positive terminal and a negative terminal for connecting to external devices, the positive terminal being connected to the battery positive connection terminal or the second end of the main positive switch, the negative terminal being connected to the battery negative connection terminal and / or the second end of the main negative switch, and the negative terminal of the charging and power distribution module being further connected to the second end of any one of the three-phase windings or the first end of the three-phase windings; a controller for causing the energy conversion device to operate in a corresponding working mode according to a control signal. The present invention aims to achieve charging compatibility for vehicles with different charging voltage protocols in various situations.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to an energy conversion device and a vehicle. Background Art

[0002] With the development of electric vehicle technology, there are more and more types of vehicles. Different types of automotive batteries have different charging voltages. Currently, most DC fast chargers have three specifications: 500V, 750V, and 1000V. For vehicles with a higher charging voltage, such as 800V, vehicles on the new platform cannot use 500V fast chargers for charging, and using a 750V fast charger cannot fully charge the power battery. Moreover, the penetration rate of chargers is not high and cannot support long-distance driving; in addition, due to different voltages between vehicles or between a vehicle and external devices, mutual energy replenishment charging cannot be carried out. Summary of the Invention

[0003] The main object of the present invention is to propose an energy conversion device, aiming to achieve charging compatibility for vehicles with different charging voltage protocols under various circumstances.

[0004] To achieve the above object, the energy conversion device proposed by the present invention includes:

[0005] A battery connection circuit, including a battery positive connection end, a battery negative connection end, a main positive switch, and a main negative switch for connecting to a battery. The first end of the main positive switch is connected to the battery positive connection end, and the first end of the main negative switch is connected to the battery negative connection end;

[0006] A motor module, including an inverter and motor windings. The first busbar end of the inverter is connected to the second end of the main positive switch, the second busbar end of the inverter is connected to the second end of the main negative switch. The motor windings include three-phase windings. The first ends of the three-phase windings are connected to each other, and the second ends of the three-phase windings are respectively connected to the neutral points of the three-phase bridge arms of the inverter in a one-to-one correspondence;

[0007] A charging and power distribution module, having a positive terminal and a negative terminal for connecting to an external device. The positive terminal of the charging and power distribution module is connected to the battery positive connection end or the second end of the main positive switch. The negative terminal of the charging and power distribution module is connected to the battery negative connection end and / or the second end of the main negative switch. The negative terminal of the charging and power distribution module is also connected to the second end of any one of the three-phase windings or the first end of the three-phase windings;

[0008] A controller is configured to control the power charging and distribution module, the battery connection circuit, and the motor module according to control signals corresponding to working modes, so that the energy conversion device operates in the corresponding working modes. The working modes include at least one of a motor driving mode for supplying power from the battery to the motor, a direct charging mode for charging the battery from an external device, a motor boost charging mode, a motor buck charging mode, a motor boost discharging mode and a motor buck discharging mode for discharging the battery to an external device, and a battery pulse charge and discharge heating mode for heating the battery.

[0009] Optionally, the power charging and distribution module includes a fast charging positive switch, a first boost switch, a first buck switch, and a second buck switch. The fast charging positive switch is connected between the positive terminal connection of the battery and the external device. The first boost switch is connected between the negative terminal connection of the battery and the external device. The first buck switch is connected between the first boost switch and the negative terminal connection of the battery. The second buck switch is connected between the second end of the main negative switch and the negative extreme of the power charging and distribution module. The controller is configured to control the fast charging positive switch, the first boost switch, the first buck switch, and the second buck switch to be turned off when receiving the control signal of the motor driving mode, so as to output the voltage output by the battery to the motor winding through the battery connection circuit.

[0010] Optionally, the controller is configured to control the power charging and distribution module to access the power supply of the external device when receiving the control signal of the motor boost charging mode, control the inverter to transmit the power supply voltage of the external device to the motor winding for energy storage, and control the inverter to output the first stored energy of the motor winding and the power supply voltage of the external device after superposition to the battery through the battery connection circuit for charging.

[0011] Optionally, the power charging and distribution module includes a fast charging positive switch, a first buck switch, a second buck switch, and a first boost switch. The fast charging positive switch is connected between the positive terminal connection of the battery and the external device. The first boost switch is connected between the negative terminal connection of the battery and the external device. The first buck switch is connected between the first boost switch and the negative terminal connection of the battery. The second buck switch is connected between the second end of the main negative switch and the negative extreme of the power charging and distribution module. The negative extreme of the power charging and distribution module is connected to the second end of any one of the three-phase windings.

[0012] Optionally, the motor boost charging mode includes:

[0013] In the first energy storage stage, the controller controls the fast charge positive switch, the first boost switch, and the main positive switch to conduct, controls the main negative switch, the first buck switch, and the second buck switch to disconnect, and controls the first upper arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect. The first upper arm switch is any one or both of the two upper arm switches corresponding to the two-phase windings not connected to the negative terminal of the power conversion and distribution module; and / or,

[0014] In the boost charging stage, the controller controls the fast charge positive switch, the first boost switch, and the main negative switch to conduct, controls the main positive switch, the first buck switch, and the second buck switch to disconnect; and controls the first lower arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect. The first lower arm switch is connected to the same phase winding as the first upper arm switch.

[0015] Optionally, the power conversion and distribution module includes a fast charge positive switch, a first buck switch, a second buck switch, and a first boost switch. The fast charge positive switch is connected between the battery positive connection terminal and the external device. The first boost switch is connected between the battery negative connection terminal and the external device. The first buck switch is connected between the first boost switch and the battery negative connection terminal. The second buck switch is connected between the second end of the main negative switch and the negative terminal of the power conversion and distribution module. The negative terminal of the power conversion and distribution module is connected to the first end of the three-phase winding.

[0016] Optionally, the motor boost charging mode includes:

[0017] In the first energy storage stage, the controller controls the fast charge positive switch, the first boost switch, and the main positive switch to conduct, controls the main negative switch, the first buck switch, and the second buck switch to disconnect, and controls at least one upper arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect; and / or,

[0018] In the boost charging stage, the controller controls the fast charge positive switch, the first boost switch, and the main negative switch to conduct, controls the main positive switch, the first buck switch, and the second buck switch to disconnect; and controls the lower arm switch of the same phase winding as the upper arm switch that conducts in the first energy storage stage of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0019] Optionally, when receiving the control signal of the motor step-down charging mode, the controller is configured to control the charging and power distribution module to access the power supply of an external device, control the inverter to transmit the power supply voltage of the external device to the motor winding for energy storage, and control the inverter to output the second energy storage of the motor winding to the battery through the battery connection circuit for charging.

[0020] Optionally, the charging and power distribution module includes a fast charge positive switch, a first step-down switch, a second step-down switch, and a first boost switch. The fast charge positive switch is connected between the positive battery connection terminal and the external device. The first boost switch is connected between the negative battery connection terminal and the external device. The first step-down switch is connected between the first boost switch and the negative battery connection terminal. The second step-down switch is connected between the second end of the main negative switch and the negative terminal of the charging and power distribution module. The negative terminal of the charging and power distribution module is connected to the second end of any one of the three-phase windings.

[0021] Optionally, the motor step-down charging mode includes:

[0022] A second energy storage stage, where the controller controls the fast charge positive switch, the first step-down switch, and the second step-down switch to conduct, controls the main negative switch, the first boost switch, and the main positive switch to disconnect, and controls the first lower arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect. The first lower arm switch is any one of the two lower arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and power distribution module; and / or,

[0023] A step-down charging stage, where the controller controls the first step-down switch and the main positive switch to conduct, controls the fast charge positive switch, the first boost switch, the second step-down switch, and the main negative switch to disconnect; and controls the first upper arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect. The first lower arm switch and the first upper arm switch are connected to the same phase winding.

[0024] Optionally, the charging and power distribution module includes a fast charge positive switch, a first step-down switch, a second step-down switch, and a first boost switch. The fast charge positive switch is connected between the positive battery connection terminal and the external device. The first boost switch is connected between the negative battery connection terminal and the external device. The first step-down switch is connected between the first boost switch and the negative battery connection terminal. The second step-down switch is connected between the second end of the main negative switch and the negative terminal of the charging and power distribution module. The negative terminal of the charging and power distribution module is connected to the first end of the three-phase windings.

[0025] Optionally, the motor step-down charging mode includes:

[0026] In the second energy storage stage, the controller controls the fast charge positive switch, the first buck switch, and the second buck switch to conduct, controls the main negative switch, the first boost switch, and the main positive switch to disconnect, and controls at least one lower arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect; and / or,

[0027] In the step-down charging stage, the controller controls the first buck switch and the main positive switch to conduct, controls the fast charge positive switch, the first boost switch, the second buck switch, and the main negative switch to disconnect; and controls the upper arm switch of the same phase winding as the lower arm switch that conducts in the second energy storage stage of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all arm switches of the inverter to disconnect.

[0028] Optionally, when receiving the control signal of the motor boost discharge mode, the controller is configured to control the inverter to transfer the power voltage output by the battery to the motor winding for energy storage, and control the inverter to output the superposition of the third energy storage energy of the motor winding and the power voltage of the battery to an external device for charging.

[0029] Optionally, the power charging and distribution module includes a fast charge positive switch, a first buck switch, a second buck switch, and a first boost switch. The fast charge positive switch is connected between the positive terminal connection of the battery and the external device. The first boost switch is connected between the negative terminal connection of the battery and the external device. The first buck switch is connected between the first boost switch and the negative terminal connection of the battery. The second buck switch is connected between the second end of the main negative switch and the negative extreme of the power charging and distribution module. The negative extreme of the power charging and distribution module is connected to the second end of any one of the three-phase windings.

[0030] Optionally, the motor boost discharge mode includes:

[0031] In the third energy storage stage, the controller controls the main positive switch and the first buck switch to conduct, controls the main negative switch, the fast charge positive switch, the first boost switch, and the second buck switch to disconnect; and controls the first upper arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect. The first upper arm switch is any one or both of the two upper arm switches corresponding to the two-phase windings not connected to the negative extreme of the power charging and distribution module; and / or,

[0032] During the boost discharge stage, the controller controls the fast charge positive switch, the first buck switch, and the second buck switch to conduct, and controls the main positive switch, the first boost switch, and the main negative switch to disconnect; and controls the first lower arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect. The first lower arm switch and the first upper arm switch are connected to the same phase winding.

[0033] Optionally, the power charging and distribution module includes a fast charge positive switch, a first buck switch, a second buck switch, and a first boost switch. The fast charge positive switch is connected between the battery positive connection terminal and the external device. The first boost switch is connected between the battery negative connection terminal and the external device. The first buck switch is connected between the first boost switch and the battery negative connection terminal. The second buck switch is connected between the second end of the main negative switch and the negative extreme of the power charging and distribution module. The negative extreme of the power charging and distribution module is connected to the first end of the three-phase winding.

[0034] Optionally, the motor boost discharge mode includes:

[0035] During the third energy storage stage, the controller controls the main positive switch and the first buck switch to conduct, and controls the main negative switch, the fast charge positive switch, the first boost switch, and the second buck switch to disconnect; and controls at least one upper arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect; and / or,

[0036] During the boost discharge stage, the controller controls the fast charge positive switch, the first buck switch, and the second buck switch to conduct, and controls the main positive switch, the first boost switch, and the main negative switch to disconnect; and controls the lower arm switch of the same phase winding as the upper arm switch that conducts during the third energy storage stage of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0037] Optionally, when receiving the control signal of the motor buck discharge mode, the controller controls the inverter to transfer the power voltage output by the battery to the motor winding for energy storage, and controls the inverter to output the fourth energy storage energy of the motor winding to the external device for charging.

[0038] Optionally, the charging and power distribution module includes a fast charging positive switch, a first buck switch, a second buck switch, and a first boost switch. The fast charging positive switch is connected between the positive terminal connection of the battery and the external device. The first boost switch is connected between the negative terminal connection of the battery and the external device. The first buck switch is connected between the first boost switch and the negative terminal connection of the battery. The second buck switch is connected between the second terminal of the main negative switch and the negative extreme of the charging and power distribution module. The negative extreme of the charging and power distribution module is connected to the second terminal of any one of the three-phase windings.

[0039] Optionally, the motor buck discharge mode includes:

[0040] In the fourth energy storage stage, the controller controls the fast charging positive switch, the first boost switch, and the main negative switch to conduct, controls the main positive switch, the first buck switch, and the second buck switch to disconnect, and controls at least one lower arm switch of the inverter to conduct. The first lower arm switch is any one or both of the two lower arm switches corresponding to the two-phase windings not connected to the negative extreme of the charging and power distribution module; and / or,

[0041] In the buck discharge stage, the controller controls the fast charging positive switch, the main positive switch, and the first boost switch to conduct, controls the main negative switch, the first buck switch, and the second buck switch to disconnect; and controls the first upper arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect. The first lower arm switch and the first upper arm switch are connected to the same phase winding.

[0042] Optionally, the charging and power distribution module includes a fast charging positive switch, a first buck switch, a second buck switch, and a first boost switch. The fast charging positive switch is connected between the positive terminal connection of the battery and the external device. The first boost switch is connected between the negative terminal connection of the battery and the external device. The first buck switch is connected between the first boost switch and the negative terminal connection of the battery. The second buck switch is connected between the second terminal of the main negative switch and the negative extreme of the charging and power distribution module. The negative extreme of the charging and power distribution module is connected to the first terminal of the three-phase windings.

[0043] Optionally, the motor buck discharge mode includes:

[0044] In the fourth energy storage stage, the controller controls the fast charging positive switch, the first boost switch, and the main negative switch to conduct, controls the main positive switch, the first buck switch, and the second buck switch to disconnect, and controls at least one lower arm switch of the inverter to conduct; and / or,

[0045] During the step-down discharge stage, the controller controls the fast charge positive switch, the main positive switch, and the first boost switch to conduct, and controls the main negative switch, the first step-down switch, and the second step-down switch to disconnect; and controls the lower arm switch of the same phase winding as the upper arm switch that conducts during the fourth energy storage stage of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0046] Optionally, when receiving the control signal of the battery pulse charge-discharge heating mode, the controller is configured to control the motor module and the power charging and distribution module to heat the battery.

[0047] Optionally, the battery pulse charge-discharge heating mode includes a first battery pulse charge-discharge heating mode. The power charging and distribution module includes a first step-down switch, a first boost switch, a fast charge positive switch, a second step-down switch, and a first capacitor. The fast charge positive switch is connected between the positive terminal connection of the battery and an external device. The first boost switch is connected between the negative terminal connection of the battery and the external device. The second step-down switch is connected between the second terminal of the main negative switch and the negative terminal of the power charging and distribution module. The first step-down switch is connected between the first boost switch and the negative terminal connection of the battery. The first capacitor is connected between the first busbar end and the second busbar end of the inverter. The negative terminal of the power charging and distribution module is connected to the second terminal of any one of the three-phase windings.

[0048] Optionally, the first battery pulse charge-discharge heating mode includes:

[0049] During the fifth energy storage stage, the controller controls the first step-down switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the first upper arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect. The first upper arm switch is any one or both of the two upper arm switches corresponding to the two-phase windings not connected to the negative terminal of the power charging and distribution module; and / or,

[0050] During the sixth energy storage stage, the controller controls the first step-down switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the first lower arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect. The first lower arm switch is connected to the same phase winding as the first upper arm switch; and / or,

[0051] In the first energy - releasing stage, the controller controls the first buck - down switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the lower - arm switch of the first phase of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect. The lower - arm switch of the first phase is connected to the same phase winding as the upper - arm switch of the first phase; and / or,

[0052] In the second energy - releasing stage, the controller controls the first buck - down switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the upper - arm switch of the inverter that conducts in the fifth energy - storage stage to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0053] Optionally, the battery pulse charge - discharge heating mode includes the first battery pulse charge - discharge heating mode. The power conversion and distribution module includes a first buck - down switch, a first boost - up switch, a fast - charge positive switch, a second buck - down switch, and a first capacitor. The fast - charge positive switch is connected between the positive - terminal connection of the battery and an external device. The first boost - up switch is connected between the negative - terminal connection of the battery and the external device. The second buck - down switch is connected between the second terminal of the main negative switch and the negative terminal of the power conversion and distribution module. The first buck - down switch is connected between the first boost - up switch and the negative - terminal connection of the battery. The first capacitor is connected between the first bus - bar terminal and the second bus - bar terminal of the inverter. The negative terminal of the power conversion and distribution module is connected to the first end of the three - phase winding.

[0054] Optionally, the first battery pulse charge - discharge heating mode includes:

[0055] In the fifth energy - storage stage, the controller controls the first buck - down switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls at least one upper - arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect; and / or,

[0056] In the sixth energy - storage stage, the controller controls the first buck - down switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the lower - arm switch of the same phase winding as the upper - arm switch of the inverter that conducts in the fifth energy - storage stage to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect; and / or,

[0057] In the first energy - releasing stage, the controller controls the first buck - down switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the lower - arm switch of the same phase winding as the upper - arm switch of the inverter that conducts in the fifth energy - storage stage to conduct, controls the remaining arm switches of the inverter to disconnect; and / or,

[0058] In the second exothermic stage, the controller controls the first buck switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the upper-bridge arm switch of the inverter that conducts in the fifth energy storage stage to conduct, controls the remaining bridge arm switches of the inverter to disconnect, or controls all the bridge arm switches of the inverter to disconnect.

[0059] Optionally, the battery pulse charge-discharge heating mode includes a second battery pulse charge-discharge heating mode. The power conversion and distribution module includes a first buck switch, a first boost switch, a fast charge positive switch, a second buck switch, a capacitor switch, and a second capacitor. The fast charge positive switch is connected between the battery positive connection terminal and the external device. The first boost switch is connected between the battery negative connection terminal and the external device. The second buck switch is connected between the second end of the main negative switch and the negative terminal of the power conversion and distribution module. The capacitor switch is connected between the fast charge positive switch and the first end of the second capacitor. The second end of the second capacitor is connected to the negative terminal of the power conversion and distribution module. The first buck switch is connected between the first boost switch and the battery negative connection terminal. The negative terminal of the power conversion and distribution module is connected to the second end of any one of the three-phase windings.

[0060] Optionally, the second battery pulse charge-discharge heating mode includes:

[0061] In the seventh energy storage stage, the controller controls the first buck switch and the main negative switch to conduct, controls the main positive switch to disconnect; and controls the first lower-bridge arm switch of the inverter to conduct, controls the remaining bridge arm switches of the inverter to disconnect; the first lower-bridge arm switch is any one or both of the two lower-bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the power conversion and distribution module; and / or,

[0062] In the eighth energy storage stage, the controller controls the first buck switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the first upper-bridge arm switch of the inverter to conduct, controls the remaining bridge arm switches of the inverter to disconnect, or controls all the bridge arm switches of the inverter to disconnect, and the first upper-bridge arm switch and the first lower-bridge arm switch are connected to the same phase winding; and / or,

[0063] In the third exothermic stage, the controller controls the first buck switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the first upper-bridge arm switch of the inverter to conduct, controls the remaining bridge arm switches of the inverter to disconnect, and the first upper-bridge arm switch and the first lower-bridge arm switch are connected to the same phase winding; and / or,

[0064] In the fourth energy release stage, the controller controls the first buck switch and the main negative switch to conduct, controls the main positive switch to disconnect, and controls the lower arm switch of the inverter that conducts in the seventh energy storage stage to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0065] Optionally, the battery pulse charge and discharge heating mode includes a second battery pulse charge and discharge heating mode. The power conversion and distribution module includes a first buck switch, a first boost switch, a fast charge positive switch, a second buck switch, a capacitor switch, and a second capacitor. The fast charge positive switch is connected between the battery positive connection terminal and an external device. The first boost switch is connected between the battery negative connection terminal and the external device. The second buck switch is connected between the second terminal of the main negative switch and the negative terminal of the power conversion and distribution module. The capacitor switch is connected between the fast charge positive switch and the first terminal of the second capacitor. The second terminal of the second capacitor is connected to the negative terminal of the power conversion and distribution module. The first buck switch is connected between the first boost switch and the battery negative connection terminal. The negative terminal of the power conversion and distribution module is connected to the first end of the three-phase winding.

[0066] Optionally, the second battery pulse charge and discharge heating mode includes:

[0067] In the seventh energy storage stage, the controller controls the first buck switch and the main negative switch to conduct, controls the main positive switch to disconnect; and controls at least one lower arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect; and / or,

[0068] In the eighth energy storage stage, the controller controls the first buck switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the upper arm switch of the same phase winding as the lower arm switch of the inverter that conducts in the seventh energy storage stage to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect; and / or,

[0069] In the third energy release stage, the controller controls the first buck switch and the main positive switch to conduct, controls the main negative switch to disconnect, and controls the upper arm switch of the same phase winding as the lower arm switch of the inverter that conducts in the seventh energy storage stage to conduct, controls the remaining arm switches of the inverter to disconnect; and / or,

[0070] In the fourth energy release stage, the controller controls the first buck switch and the main negative switch to conduct, controls the main positive switch to disconnect, and controls the lower arm switch of the inverter that conducts in the seventh energy storage stage to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0071] Optionally, the charging and power distribution module further includes:

[0072] A discharge circuit, the discharge circuit being connected in parallel between the first end and the second end of the second capacitor, the discharge circuit being configured to pre-charge the voltage of the second capacitor before the energy conversion device enters the motor boost charging mode, and discharge the voltage of the second capacitor after the energy conversion device exits the motor boost charging mode.

[0073] Optionally, the controller is further configured to control the charging and power distribution module to output the power of an external device to the battery for charging through the battery connection circuit when receiving the control signal of the direct charging mode.

[0074] Optionally, the charging and power distribution module includes a fast charge positive switch, a first buck switch, a second buck switch, and a first boost switch. The fast charge positive switch is connected between the battery positive connection terminal and the external device. The first boost switch is connected between the battery negative connection terminal and the external device. The first buck switch is connected between the first boost switch and the battery negative connection terminal. The second buck switch is connected between the second end of the main negative switch and the negative extreme of the charging and power distribution module.

[0075] Optionally, the direct charging mode includes

[0076] A first direct charging stage, the controller is configured to control the fast charge positive switch, the first boost switch, and the first buck switch to conduct, and control the main negative switch, the main positive switch, and the second buck switch to disconnect when receiving the control signal of the direct charging mode; or,

[0077] A second direct charging stage, the controller is configured to control the fast charge positive switch, the second buck switch, and the main negative switch to conduct, and control the first boost switch, the first buck switch, and the main positive switch to disconnect when receiving the control signal of the direct charging mode.

[0078] Optionally, the battery connection circuit further includes a fast charge positive switch and a first buck switch. The charging and power distribution module includes a first boost switch, a capacitor switch, and a second buck switch. The first end of the capacitor switch is connected to the second end of the main positive switch. The first end of the second buck switch is connected to the second end of the main negative switch. The first end of the fast charge positive switch is connected to the battery positive connection terminal. The second end of the fast charge positive switch is used to connect to the external device. The first end of the first buck switch is connected to the battery negative connection terminal. The second end of the first buck switch is connected to the first end of the first boost switch. The second ends of the first boost switch and the second buck switch are used to connect to the external device.

[0079] Optionally, the battery connection circuit further includes a fast charge positive switch and a first buck switch, and the power conversion and distribution module includes a first boost switch, a capacitor switch, and a second buck switch. The first end of the fast charge positive switch is connected to the battery positive connection end, the second end of the fast charge positive switch and the first end of the capacitor switch are used to connect to an external device, and the first end of the second buck switch is connected to the second end of the main negative switch; the first end of the first buck switch is connected to the battery negative connection end, the second end of the first buck switch is connected to the first end of the first boost switch, and the second end of the first boost switch and the second end of the second buck switch are used to connect to an external device.

[0080] Optionally, the battery connection circuit further includes a fast charge positive switch and a first buck switch, and the power conversion and distribution module includes a capacitor switch and a second buck switch. The first end of the fast charge positive switch is connected to the battery positive connection end, the second end of the fast charge positive switch and the first end of the capacitor switch are used to connect to an external device, the first end of the second buck switch is connected to the second end of the main negative switch, the first end of the first buck switch is connected to the battery negative connection end, the second end of the first buck switch is connected to the second end of the capacitor switch, and the second end of the second buck switch is used to connect to an external device.

[0081] Optionally, the power conversion and distribution module includes a first buck switch, a second buck switch, a fast charge positive switch, a first boost switch, and a second boost switch. The first end of the first buck switch is connected to the battery positive connection end, the second end of the first buck switch is connected to the first end of the first boost switch, the first end of the second buck switch is connected to the second end of the main positive switch, the second end of the first boost switch and the second end of the second buck switch are used to connect to an external device, the first end of the fast charge positive switch is connected to the battery negative connection end, the second end of the fast charge positive switch is used to connect to an external device, and the second buck switch is connected to the second end of the main positive switch.

[0082] Optionally, the power conversion and distribution module further includes a first inductor and / or a second boost switch. The second boost switch is connected between the three-phase winding and the first end of the first inductor, and the second end of the first inductor is connected to the negative terminal of the power conversion and distribution module.

[0083] Optionally, the energy conversion device further includes a pre-charge switch, a first resistor, a main fuse, and a shunt; a first end of the main fuse is connected to the battery positive connection end, a first end of the shunt is connected to the battery negative connection end, a second end of the main fuse, a first end of the main positive switch, and a first end of the first resistor are connected, a second end of the first resistor is connected to a first end of the pre-charge switch, a second end of the main positive switch and a second end of the pre-charge switch are connected, and a second end of the shunt is connected to a first end of the main negative switch.

[0084] Optionally, a positive end of the power distribution module is connected to a second end of the main fuse, and a negative end of the power distribution module is connected to a second end of the shunt.

[0085] The present invention also provides a vehicle, including a battery module and the energy conversion device as described above. A positive electrode of the battery module is connected to the battery positive connection end in the energy conversion device, and a negative electrode of the battery module is connected to the battery negative connection end in the energy conversion device.

[0086] The energy conversion device constituted by the battery connection circuit, the motor module, the power distribution module, and the controller in the present invention can perform energy conversion on the output voltage of the charging device or the output voltage of the vehicle, so as to convert the voltage output by the external device and output it to charge the battery in the vehicle, or convert the voltage output by the battery in the vehicle and output it to charge the external device. In this way, charging compatibility can be achieved for vehicles with different charging voltage protocols, and an energy conversion device can have multiple working modes, which is suitable for various situations where the voltages of the vehicle and the external device do not match. By changing the connection relationship between the positive end and the negative end of the power distribution module and the battery positive connection end, the battery negative connection end, the main positive switch, and the main negative switch in the battery connection circuit, energy conversion devices with different structures can also be formed, which are suitable for different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0088] Figure 1 It is a schematic circuit structure diagram of an embodiment of the energy conversion device of the present invention;

[0089] Figure 2 It is a schematic circuit structure diagram of another embodiment of the energy conversion device of the present invention;

[0090] Figure 3 Schematic diagram of the circuit structure of another embodiment of the energy conversion device of the present invention;

[0091] Figure 4 Schematic diagram of the circuit structure of yet another embodiment of the energy conversion device of the present invention;

[0092] Figure 5 Schematic diagram of the circuit structure of another embodiment of the energy conversion device of the present invention;

[0093] Figure 6 Schematic diagram of the circuit structure of another embodiment of the energy conversion device of the present invention;

[0094] Figure 7 Schematic diagram of the circuit structure of yet another embodiment of the energy conversion device of the present invention;

[0095] Figure 8 Schematic diagram of the circuit structure of another embodiment of the energy conversion device of the present invention;

[0096] Figure 9 Schematic diagram of the circuit structure of another embodiment of the energy conversion device of the present invention;

[0097] Figure 10 Schematic diagram of the circuit structure of yet another embodiment of the energy conversion device of the present invention;

[0098] Figure 11 Schematic diagram of the circuit structure of another embodiment of the energy conversion device of the present invention.

[0099] The realization of the object of the present invention, functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0100] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0101] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, then the directional indications will also change accordingly.

[0102] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0103] In the split-type flying car solution, there is a two-split configuration of a land vehicle body + a flying vehicle body. The land vehicle body can carry the flying vehicle body and replenish energy for the flying vehicle body. The flying vehicle body can automatically separate from / combine with the land vehicle body to achieve three-dimensional travel. However, the system platform voltages of the flying vehicle body and the land vehicle body and the intelligent robot in the car are different, so it is impossible to replenish energy for the intelligent robot or through the intelligent robot; and it is also impossible to charge each other with external devices.

[0104] To solve the above problems, the present invention proposes an energy conversion device.

[0105] Referring to Figure 1 , in an embodiment of the present invention, the energy conversion device includes:

[0106] The battery connection circuit 10 includes a battery positive connection end, a battery negative connection end, a main positive switch S1, and a main negative switch S2 for connecting to a battery. The first end of the main positive switch S1 is connected to the battery positive connection end, and the first end of the main negative switch S2 is connected to the battery negative connection end;

[0107] The motor module 20 includes an inverter and motor windings. The first busbar end of the inverter is connected to the second end of the main positive switch S1, and the second busbar end of the inverter is connected to the second end of the main negative switch S2. The motor windings include three-phase windings. The first ends of the three-phase windings are connected to each other, and the second ends of the three-phase windings are respectively connected to the neutral points of the three-phase bridge arms of the inverter;

[0108] The charging and power distribution module 30 has a positive terminal and a negative terminal for connecting to an external device. The positive terminal of the charging and power distribution module 30 is connected to the battery positive connection end or the second end of the main positive switch S1. The negative terminal of the charging and power distribution module 30 is connected to the battery negative connection end and / or the second end of the main negative switch S2. The negative terminal of the charging and power distribution module 30 is also connected to the second end of any one of the three-phase windings or the first end of the three-phase windings;

[0109] A controller is configured to control the power charging and discharging module 30, the battery connection circuit 10, and the motor module 20 according to control signals corresponding to working modes, so that the energy conversion device operates in corresponding working modes. The working modes include at least one of a motor driving mode for supplying power from the battery to the motor, a direct charging mode for charging the battery from an external device, a motor boost charging mode, a motor buck charging mode, a motor boost discharging mode and a motor buck discharging mode for discharging the battery to an external device, and a battery pulse charge and discharge heating mode for heating the battery.

[0110] In this embodiment, the battery connection circuit 10 can be connected to the battery module in the vehicle. Specifically, it can be connected to the battery positive electrode through the battery positive connection terminal and to the battery negative electrode through the battery negative connection terminal. The main positive switch S1 can be connected between the battery positive connection terminal and the subsequent circuit, and the main negative switch S2 can be connected between the battery negative connection terminal and the subsequent circuit. Thus, by controlling the conduction or cutoff of the main positive switch S1 and the main negative switch S2, the connection between the subsequent circuit and the battery can be controlled to be connected or disconnected, thereby forming different circuits to correspond to different working modes. In this embodiment, the main positive switch S1 and the main negative switch S2 can be selected from relays or other switching devices.

[0111] In this embodiment, the inverter in the motor module 20 can include three half-bridges, that is, branch pairs. Each of the three half-bridges includes a series circuit formed by an upper and a lower controllable semiconductor switch. That is, one half-bridge includes an upper arm switch tube and a lower arm switch tube. Diodes can also be respectively connected in parallel to the upper and lower controllable semiconductor switches. The common terminal of the upper-side switches of the three half-bridges is the positive bus terminal of the inverter, that is, the positive electrode of the inverter input terminal, and the common terminal of the lower-side switches of the three half-bridges is the negative bus terminal of the inverter, that is, the negative electrode of the inverter input terminal. The specific structure of the inverter in this embodiment can be used as a reference and is not limited here. The motor winding can be selected as a three-phase winding, which is connected corresponding to the three half-bridges of the inverter. The first ends of the three-phase windings are connected to each other, and the second ends of the three-phase windings can be respectively connected to the neutral points of the three arms of the inverter. Thus, by controlling the conduction and cutoff of the switches in the inverter, different circuits can be formed with the three-phase windings to correspond to different working modes.

[0112] In this embodiment, the power charging and distribution module 30 can be connected to the positive and negative electrodes of an external device through its positive and negative terminals. The power charging and distribution module 30 may further include a plurality of switching devices. For example, a switch is provided between the positive terminal and the external device, a switch is provided between the positive terminal and the negative terminal connection of the battery or the second terminal of the main negative switch S2, and a switch is provided between the negative terminal of the power charging and distribution module 30 and the motor module 20. By controlling the conduction and cutoff of the switches, combined with the conduction or cutoff of the switches described above, different circuits can be formed in the energy conversion device to correspond to different working modes. It should be noted that by changing the connection relationship between the ports of the power charging and distribution module 30, the battery connection circuit 10, and the motor module 20, a charging and discharging parallel scheme and a charging and discharging series-parallel scheme can be formed. The charging and discharging parallel scheme is to connect the positive terminal of the power charging and distribution module 30 to the positive terminal connection of the battery, and connect the negative terminal of the power charging and distribution module 30 to the negative terminal connection of the battery and the second terminal of the main negative switch S2. The specific circuit can refer to Figure 1 and Figure 2 . In the charging and discharging parallel scheme, there is no relay isolation between the positive and negative electrodes of the battery and the interface of the power charging and distribution module, which will cause the output interface of the battery to be continuously charged. Therefore, a charging and discharging series-parallel scheme can be adopted. There are two types of charging and discharging series-parallel schemes. The first is to connect the positive terminal of the power charging and distribution module 30 to the second terminal of the main positive switch S1, and connect the negative terminal of the power charging and distribution module 30 to the second terminal of the main negative switch S2. The specific circuit can refer to Figure 3 ; the second is to connect the positive terminal of the power charging and distribution module 30 to the positive terminal connection of the battery, and connect the negative terminal of the power charging and distribution module 30 to the negative terminal connection of the battery and the second terminal of the main negative switch S2. The specific circuit can refer to Figure 4 . Compared with the charging and discharging loop parallel scheme, in the charging and discharging loop series scheme, the main positive switch S1 and the main negative switch S2 are shared in the boost charging mode and the ordinary direct charging mode, resulting in higher requirements for the specification selection of the main positive switch S1 and the main negative switch S2, and higher costs. To solve this problem, a charging and discharging loop series-parallel scheme is proposed in this embodiment. The switch between the negative terminal of the power charging and distribution module 30 and the negative terminal connection of the battery described above is arranged in the power charging and distribution module 30 or the battery connection circuit 10, so that the negative electrode of the battery connection circuit 10 and the output interface of the battery are isolated by a relay, so that the battery output interface will not be continuously charged. In this way, the positive and negative electrodes of the battery and the interface of the power charging and distribution module in the two charging and discharging series-parallel schemes can be isolated by a relay, thus avoiding the continuous charging of the battery output interface. Therefore, users can select the corresponding connection scheme according to their needs, so as to be applicable to different application scenarios. The circuit structure mentioned in this embodiment is only for reference and does not limit the specific circuit structure.

[0113] In this embodiment, the controller is not shown in the figure. The output end of the controller can be connected to the controlled ends of each switching device and module, so as to output an electrical signal to control the conduction or cut-off of the switching device and control the operation of different modules. The controller can be a Digital Signal Processor (DSP for short), a Programmable Logic Device (PLD for short), a microprocessor, an MCU single-chip microcomputer or other electronic components. The controller can receive control signals corresponding to different working modes output by the management device or external device in the vehicle, so as to make the energy conversion device operate in the corresponding working mode. The control signals of different modes can be electrical signals with different voltage values, or control signals output in other forms. The external device can be other vehicles or robots, flying cars, charging piles, etc. For example, when the vehicle does not need to be charged and does not need to charge other vehicles, the controller will receive the control signal of the motor drive mode and control the battery to supply power to the motor. When the external device charges the vehicle, the controller can receive the control signals of the direct charging mode, the motor boost charging mode and the motor buck charging mode; the specific mode can be determined according to the voltage relationship between the external device and the vehicle. For example, if the output voltage of the external device is higher than the charging voltage of the vehicle, the direct charging mode or the motor buck charging mode can be adopted; if the output voltage of the external device is lower than the charging voltage of the vehicle, the motor boost charging mode can be adopted. When the vehicle needs to charge the external device, the controller can receive the control signal of the motor boost discharge mode or the motor buck discharge mode. The specific mode can be determined according to the voltage relationship between the external device and the vehicle. For example, if the output voltage of the vehicle is higher than the charging voltage of the external device, the motor buck discharge mode can be adopted; if the output voltage of the vehicle is lower than the charging voltage of the external device, the motor boost discharge mode can be adopted. And in the case of low ambient temperature, the controller will receive the control signal of the battery pulse charge and discharge heating mode and heat the battery by repeatedly charging and discharging the battery.

[0114] The energy conversion device of the present invention, which consists of a battery connection circuit 10, a motor module 20, a charging and power distribution module 30, and a controller, can perform energy conversion on the output voltage of a charging device or the output voltage of a vehicle, so as to convert the voltage output by an external device and then output it to charge the battery in the vehicle, or convert the voltage output by the battery in the vehicle and then output it to charge an external device. In this way, charging compatibility can be achieved for vehicles with different charging voltage protocols, and an energy conversion device can have multiple working modes, which is applicable to various situations where the voltages of vehicles and external devices do not match. By changing the connection relationships between the positive and negative terminals of the charging and power distribution module 30 and the battery positive connection terminal, battery negative connection terminal, main positive switch S1, and main negative switch S2 in the battery connection circuit 10, energy conversion devices with different structures can also be formed, which are applicable to different scenarios.

[0115] Referring to Figures 1 to 2 , in an embodiment, the charging and power distribution module includes a fast charging positive switch S4, a first boost switch S5, a first buck switch S6, and a second buck switch S7. The fast charging positive switch S4 is connected between the battery positive connection terminal and the external device. The first boost switch S5 is connected between the battery negative connection terminal and the external device. The first buck switch S6 is connected between the first boost switch and the battery negative connection terminal. The second buck switch S7 is connected between the second end of the main negative switch S2 and the negative terminal of the charging and power distribution module. The controller is configured to control the fast charging positive switch S4, the first boost switch S5, the first buck switch S6, and the second buck switch S7 to disconnect when receiving the control signal of the motor driving mode, so as to output the voltage output by the battery to the motor winding through the battery connection circuit 10.

[0116] In this embodiment, when the controller receives the control signal of the motor driving mode, it can control the charging and power distribution module 30 to stop working. For example, it can control the fast charging positive switch S4, the first boost switch S5, the first buck switch S6, and the second buck switch S7 in the charging and power distribution module 30 to disconnect. In this way, the electrical connection between the energy conversion device and the external device will also be disconnected, and it will not receive the voltage output by the external device, nor will it output voltage to the external device. It will only output the voltage output by the battery to the motor winding, and the vehicle will be driven by the motor winding. In the case where energy transfer with an external device is not required, the motor driving mode can be entered. In this embodiment, by controlling the charging and power distribution module 30 to stop working, the energy conversion device can enter the motor driving mode, and only the battery is controlled to supply power to the motor winding. In this way, it can be applicable to situations where no external energy replenishment or rescue is required.

[0117] Referring to Figures 1 to 2, in one embodiment, the controller is configured to, when receiving a control signal for the motor boost charging mode, control the power charging and distribution module 30 to connect to the power supply of an external device, control the inverter to transmit the power supply voltage of the external device to the motor winding for energy storage, and control the inverter to output the superposition of the first stored energy of the motor winding and the power supply voltage of the external device to the battery for charging through the battery connection circuit 10.

[0118] In this embodiment, when the vehicle's battery needs to be charged by an external device and the output voltage of the external device is less than the charging voltage of the battery, it is necessary to boost the output voltage of the external device before charging the battery. Therefore, the management device can first judge the voltage magnitude. When the charging voltage of the battery is greater than the output voltage of the external device, it can be determined to enter the motor boost charging mode. For example, when the charging voltage of the battery is 700V and the output voltage of the charging pile or the external device is 500V, it is necessary to enter the motor boost charging mode. At this time, the management device can output a control signal for the boost charging mode to the controller; the controller can then boost the power supply of the external device through controlling the power charging and distribution module 30, the inverter and the motor winding, superimpose it with the power supply voltage of the external device, and then output a higher voltage to the battery for charging through the battery connection circuit 10. This can be applicable to the situation where energy supplementation is required through an external device with a relatively low output voltage, avoiding the situation that the battery in the vehicle cannot be fully charged due to the low output voltage of the external device, which affects the user's travel.

[0119] In an exemplary technique, the power charging and distribution module 30 includes a fast charging positive switch S4, a first buck switch S6, a second buck switch S7, and a first boost switch S5. The fast charging positive switch S4 is connected between the battery positive connection terminal and the external device. The first boost switch S5 is connected between the battery negative connection terminal and the external device. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection terminal. The second buck switch S7 is connected between the second end of the main negative switch S2 and the negative terminal of the power charging and distribution module 30. The negative terminal of the power charging and distribution module 30 is connected to the second end of any one of the three-phase windings. In combination with Figures 1 to 2 An explanation of the motor boost charging mode is given.

[0120] Refer to Figures 1 to 2 , in one embodiment, the motor boost charging mode includes:

[0121] In the first energy storage stage, the controller controls the fast charge positive switch S4, the first boost switch S5, and the main positive switch S1 to conduct, controls the main negative switch S2, the first buck switch S6, and the second buck switch S7 to disconnect, and controls the first upper bridge arm switch of the inverter to conduct, and controls the remaining bridge arm switches of the inverter to disconnect. The first upper bridge arm switch is any one or both of the two upper bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and power distribution module 30; and / or,

[0122] In the boost charging stage, the controller controls the fast charge positive switch S4, the first boost switch S5, and the main negative switch S2 to conduct, controls the main positive switch S1, the first buck switch S6, and the second buck switch S7 to disconnect; and controls the first lower bridge arm switch of the inverter to conduct, controls the remaining bridge arm switches of the inverter to disconnect, or controls all the bridge arm switches of the inverter to disconnect. The first lower bridge arm switch is connected to the same phase winding as the first upper bridge arm switch.

[0123] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the first energy storage stage, the voltage output by the external device can be transmitted to the motor winding for energy storage. The external device can be a charging pile or other vehicle. When the controller controls the corresponding switches to conduct or disconnect in the boost charging stage, the first energy storage energy in the motor winding and the voltage output by the external device can be superimposed and then output to the battery for charging.

[0124] It should be noted that in this embodiment, controlling the first upper bridge arm switch and the first lower bridge arm switch to conduct can control the conduction and cut-off of the bridge arm switch with a preset duty cycle. From the calculation formula of the voltage on the inductor, it can be known that when the inductance and the current in the circuit remain unchanged, by changing the conduction time of the bridge arm switch, the voltage value of the inductor can be changed. The specific duty cycle can be set according to user needs. For example, in the first energy storage stage, the voltage value of the inductor can be controlled to be less than the voltage of the first battery pack by controlling the duty cycle of the bridge arm switch, so that the first battery pack charges the motor winding. The subsequent control process is the same. By controlling the duty cycle to change the voltage value of the inductor, the battery pack charges the inductor, or the inductor discharges to the battery pack.

[0125] When all the leg switches of the inverter are turned off, the current in the circuit will flow through the diode in parallel with the switch tube in the same phase as the switch tube conducting in the previous stage for freewheeling. For example, in the first energy storage stage, the controller controls the conduction of the first upper leg switch of the inverter. In the first energy release stage, the controller controls all the leg switches of the inverter to be turned off. At this time, the current will form a loop through the diode in parallel with the first lower leg switch. Of course, the first lower leg switch can also be controlled to conduct to form a loop, so that the energy release speed of the motor winding is faster. The subsequent process of controlling the leg switches of the inverter to turn off in this specification is the same as the principle in this embodiment.

[0126] Further, in this embodiment, the first energy storage stage and the boost charging stage in the motor boost charging mode can be combined to achieve the effect of boost charging. For example, if it first enters the first energy storage stage and then enters the boost charging stage, the voltage output by the external device can be first transmitted to the motor winding for energy storage, and when the first stored energy reaches the first preset energy value, it switches to the boost charging stage, and the first stored energy in the motor winding and the voltage of the external device are superimposed and output to the battery for charging. In this way, when the voltage output by the external device is less than the charging voltage of the battery, the voltage of the external device output can be boosted through the combination of the two stages in the motor boost charging mode to complete the normal charging of the battery. It can be understood that the first preset energy value can be the voltage value that needs to be boosted. For example, when the charging voltage of the battery is 700V and the output voltage of the charging pile or the external device is 500V, the voltage value that needs to be boosted is 200V. At this time, the energy stored in the motor winding needs to charge the external device by at least 200V. Specifically, the energy storage and charging speed of the winding can be tested in advance. After the charging time of the winding reaches the preset time, the motor winding is controlled to release energy, and after the energy release time of the winding reaches the preset time, the motor winding is charged. In this way, the motor boost charging mode of the energy conversion device in this embodiment can realize the charging of the battery with a high charging voltage in the vehicle by an external device with a low output voltage. The specific control principle of the motor boost charging mode can refer to the description of this embodiment, and the user can also adjust the circuit structure, charging time, etc. according to actual needs, which is not limited here.

[0127] The user can also combine or expand multiple stages of the motor boost charging mode according to actual needs. The specific principle can refer to the above description, which is not limited here.

[0128] It should be noted that in another embodiment, in the motor boost charging mode, the power charging and distribution module 30 includes a fast charge positive switch S4, a first buck switch S6, a second buck switch S7, and a first boost switch S5. The fast charge positive switch S4 is connected between the battery positive connection terminal and the external device. The first boost switch S5 is connected between the battery negative connection terminal and the external device. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection terminal. The second buck switch S7 is connected between the second end of the main negative switch S2 and the negative terminal of the power charging and distribution module 30. The negative terminal of the power charging and distribution module 30 is connected to the first end of the three-phase winding. In combination with Figures 1 to 2 The motor boost charging mode will be described.

[0129] Referring to Figures 1 to 2 , in one embodiment, the motor boost charging mode includes:

[0130] The first energy storage stage: The controller controls the fast charge positive switch S4, the first boost switch S5, and the main positive switch S1 to conduct, controls the main negative switch S2, the first buck switch S6, and the second buck switch S7 to disconnect, and controls at least one upper bridge arm switch of the inverter to conduct, and controls the remaining bridge arm switches of the inverter to disconnect; and / or,

[0131] The boost charging stage: The controller controls the fast charge positive switch S4, the first boost switch S5, and the main negative switch S2 to conduct, controls the main positive switch S1, the first buck switch S6, and the second buck switch S7 to disconnect; and controls the lower bridge arm switch of the same phase winding as the upper bridge arm switch that conducts in the first energy storage stage of the inverter to conduct, controls the remaining bridge arm switches of the inverter to disconnect, or controls all the bridge arm switches of the inverter to disconnect.

[0132] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the first energy storage stage, the voltage output by the external device can be transmitted to the motor winding for energy storage. The external device can be a charging pile or other vehicle. When the controller controls the corresponding switches to conduct or disconnect in the boost charging stage, the first energy storage energy in the motor winding and the voltage output by the external device can be superimposed and then output to the battery for charging.

[0133] It can be understood that when the negative terminal of the charging and power distribution module 30 is connected to the first end of the three-phase winding, there are differences in the control of the upper-bridge-arm switch and the lower-bridge-arm switch of the inverter by the controller compared with the case where the negative terminal of the charging and power distribution module 30 is connected to the second end of any one of the three-phase windings. For example, in this embodiment, when the negative terminal of the charging and power distribution module 30 is connected to the first end of the three-phase winding, jitter during the charging process can be prevented; it can also make the control of the bridge-arm switch more flexible. For example, when the negative terminal of the charging and power distribution module 30 is connected to the second end of any one of the three-phase windings, at most two upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct, while in this embodiment, at most three upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct. In this way, the overall voltage of the three-phase winding can be changed, thereby changing the energy storage and energy release speeds of the three-phase winding. For example, the more bridge-arm switches that are conducted, the higher the overall voltage of the three-phase winding, and the faster the energy storage and energy release speeds of the three-phase winding. The specific number of bridge-arm switches to be conducted can be determined according to the actual voltage requirements of the user. Motor boost charging can be achieved in both connection methods. Thus, the motor boost charging mode of the energy conversion device in this embodiment can realize charging of a land vehicle or a flying vehicle with a high charging voltage in the vehicle by an external device with a low output voltage. The specific control principle of the motor boost charging mode can refer to the description of this embodiment, and the user can also adjust the circuit structure, charging time, etc. according to actual needs, which is not limited here.

[0134] Referring to Figures 1 to 2 , in one embodiment, the controller is configured to control the charging and power distribution module 30 to be connected to the power supply of the external device when receiving the control signal of the motor buck charging mode, control the inverter to transmit the power supply voltage of the external device to the motor winding for energy storage, and control the inverter to output the second stored energy of the motor winding to the battery for charging through the battery connection circuit 10.

[0135] In this embodiment, when the vehicle's battery needs to be charged by an external device and the output voltage of the external device is greater than the charging voltage of the battery, it is necessary to step down the output voltage of the external device before charging the battery. Therefore, the management device can first judge the voltage magnitude. When the output voltage of the external device is greater than the charging voltage of the battery, it can be determined to enter the motor step-down charging mode. For example, when the charging voltage of the battery is 400V and the output voltage of the charging pile or the external device is 700V, it is necessary to enter the motor step-down charging mode at this time. At this time, the management device can output a control signal for the step-down charging mode to the controller; the controller can then step down the power supply of the external device by controlling the power distribution and charging module 30, the inverter, and the motor winding, and then output a lower voltage to the battery for charging through the battery connection circuit 10. This can be applicable to the situation where energy supplementation is required through an external device with a higher output voltage, thereby avoiding a large charging voltage being output to the battery, resulting in overcharging or damage to the battery.

[0136] In an exemplary technology, the power distribution and charging module 30 includes a fast charging positive switch S4, a first step-down switch S6, a second step-down switch S7, and a first boost switch S5. The fast charging positive switch S4 is connected between the battery positive connection end and the external device. The first boost switch S5 is connected between the battery negative connection end and the external device. The first step-down switch S6 is connected between the first boost switch S5 and the battery negative connection end. The second step-down switch S7 is connected between the second end of the main negative switch S2 and the negative end of the power distribution and charging module 30. The negative end of the power distribution and charging module 30 is connected to the second end of any one of the three-phase windings.

[0137] Refer to Figures 1 to 2 , in one embodiment, the motor step-down charging mode includes:

[0138] The second energy storage stage, the controller controls the fast charging positive switch S4, the first step-down switch S6, and the second step-down switch S7 to conduct, controls the main negative switch S2, the first boost switch S5, and the main positive switch S1 to disconnect, and controls the first lower bridge arm switch of the inverter to conduct, and controls the remaining bridge arm switches of the inverter to disconnect. The first lower bridge arm switch is any one of the two lower bridge arm switches corresponding to the two-phase windings not connected to the negative end of the power distribution and charging module 30; and / or,

[0139] During the step-down charging stage, the controller controls the first step-down switch S6 and the main positive switch S1 to conduct, and controls the fast charging positive switch S4, the first boost switch S5, the second step-down switch S7, and the main negative switch S2 to disconnect; and controls the first upper bridge arm switch of the inverter to conduct, and controls the remaining bridge arm switches of the inverter to disconnect, or controls all the bridge arm switches of the inverter to disconnect. The first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding.

[0140] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect during the second energy storage stage, the voltage output by the external device can be transmitted to the motor winding for energy storage. The external device can be a charging pile or other vehicles. When the controller controls the corresponding switches to conduct or disconnect during the step-down charging stage, the second stored energy in the motor winding can be output to the battery for charging.

[0141] It should be noted that in this embodiment, controlling the first upper bridge arm switch and the first lower bridge arm switch to conduct can be to control the conduction and disconnection of the bridge arm switch with a preset duty cycle. The specific duty cycle can be set according to the charge and discharge relationship in different stages of the motor step-down charging mode in this embodiment and with reference to the description of the voltage on the inductor in the above embodiment.

[0142] Further, in this embodiment, the second energy storage stage and the step-down charging stage in the motor step-down charging mode can be combined in two stages to achieve the effect of step-down charging. For example, entering the second energy storage stage first and then entering the step-down charging stage, the voltage output by the external device can be transmitted to the motor winding for energy storage first, and when the second stored energy reaches the second preset energy value, it can be switched to the step-down charging stage, and the second stored energy in the motor winding can be output to the battery for charging; in this way, when the charging voltage of the battery is less than the output voltage of the external device, the output voltage of the external device can be stepped down through the combination of the two stages in the motor step-down charging mode and then output to the battery for charging. It can be understood that the second preset energy value can be the charging voltage value of the battery. For example, when the charging voltage of the battery is 500V and the output voltage of the external device is 700V, the 700V voltage can be stepped down through the motor winding, and 500V voltage can be stored to charge the battery. Specifically, the energy storage and charging speed of the winding can be tested in advance. After the energy charging time of the winding reaches the preset time, the motor winding is controlled to release energy, and after the energy release time of the winding reaches the preset time, the motor winding is charged. The specific control principle of the motor step-down charging mode can be referred to the description of this embodiment, and users can also adjust the circuit structure and charging time according to actual needs, which are not limited here. In this way, this embodiment can realize the charging of a battery with a low output voltage from an external device with a high charging voltage.

[0143] The user can also combine or expand multiple stages of the motor step-down charging mode according to actual needs. For the specific principle, reference can be made to the above description, which is not limited here.

[0144] It should be noted that in another embodiment, in the motor step-down charging mode, the power charging and distribution module 30 includes a fast charging positive switch S4, a first step-down switch S6, a second step-down switch S7, and a first boost switch S5. The fast charging positive switch S4 is connected between the battery positive connection end and the external device. The first boost switch S5 is connected between the battery negative connection end and the external device. The first step-down switch S6 is connected between the first boost switch S5 and the battery negative connection end. The second step-down switch S7 is connected between the second end of the main negative switch S2 and the negative end of the power charging and distribution module 30. The negative end of the power charging and distribution module 30 is connected to the first end of the three-phase winding.

[0145] Refer to Figures 1 to 2 , in one embodiment, the motor step-down charging mode includes:

[0146] The second energy storage stage, where the controller controls the fast charging positive switch S4, the first step-down switch S6, and the second step-down switch S7 to conduct, controls the main negative switch S2, the first boost switch S5, and the main positive switch S1 to disconnect, and controls at least one lower arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect; and / or,

[0147] The step-down charging stage, where the controller controls the first step-down switch S6 and the main positive switch S1 to conduct, controls the fast charging positive switch S4, the first boost switch S5, the second step-down switch S7, and the main negative switch S2 to disconnect; and controls the upper arm switch of the same phase winding as the lower arm switch that conducts in the second energy storage stage of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all arm switches of the inverter to disconnect.

[0148] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the second energy storage stage, the voltage output by the external device can be transmitted to the motor winding for energy storage. The external device can be a charging pile or other vehicle. When the controller controls the corresponding switches to conduct or disconnect in the step-down charging stage, the second energy storage energy in the motor winding can be output to the battery for charging.

[0149] It can be understood that when the negative terminal of the charging and power distribution module 30 is connected to the first end of the three-phase winding, there are differences in the controller controlling the conduction of the upper-bridge-arm switch and the lower-bridge-arm switch of the inverter compared to the case where the negative terminal of the charging and power distribution module 30 is connected to the second end of any one phase of the three-phase winding. For example, in this embodiment, when the negative terminal of the charging and power distribution module 30 is connected to the first end of the three-phase winding, jitter during the charging process can be prevented; it can also make the control of the bridge-arm switch more flexible. For example, when the negative terminal of the charging and power distribution module 30 is connected to the second end of any one phase of the three-phase winding, at most two upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct, while in this embodiment, at most three upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct. In this way, the overall voltage of the three-phase winding can be changed, thereby changing the energy storage and energy release speeds of the three-phase winding. For example, the more bridge-arm switches that are conducted, the higher the overall voltage of the three-phase winding, and the faster the energy storage and energy release speeds of the three-phase winding. The specific number of bridge-arm switches to be conducted can be determined according to the actual voltage requirements of the user. Motor step-down charging can be achieved in both connection methods.

[0150] Referring to Figures 1 to 2 , in one embodiment, the controller is configured to, when receiving a control signal for the motor boost discharge mode, control the inverter to transmit the power supply voltage output by the battery to the motor winding for energy storage, and control the inverter to output the superposition of the third energy storage energy of the motor winding and the power supply voltage of the battery to an external device for charging.

[0151] In this embodiment, when the vehicle's battery needs to discharge to an external device and the requested charging voltage of the external device is greater than the output voltage of the battery, the output voltage of the battery needs to be boosted before charging the external device. Therefore, the management device can first judge the voltage magnitude. When the output voltage of the battery is less than the charging voltage of the external device, it can be determined to enter the step-down discharge mode. For example, when the output voltage of the battery is 500V and the requested charging voltage of the external device is 700V, the motor boost discharge mode needs to be entered. At this time, the management device can output a control signal for the motor boost discharge mode to the controller; the controller can then control the battery connection circuit 10, the charging and power distribution module 30, the inverter, and the motor winding to superpose and boost the power supply of the battery and the energy storage energy of the motor winding and output it to the external device for charging. In this way, it can be applicable to the situation where the vehicle output voltage is lower than the requested charging voltage of the external device, avoiding the situation that the vehicle output voltage is too low, resulting in the battery in the external device not being fully charged and affecting the user experience.

[0152] In an exemplary technology, the charging and power distribution module 30 includes a fast charging positive switch S4, a first buck switch S6, a second buck switch S7, and a first boost switch S5. The fast charging positive switch S4 is connected between the battery positive connection terminal and an external device. The first boost switch S5 is connected between the battery negative connection terminal and the external device. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection terminal. The second buck switch S7 is connected between the second end of the main negative switch S2 and the negative terminal of the charging and power distribution module 30. The negative terminal of the charging and power distribution module 30 is connected to the second end of any one of the three-phase windings. In combination with Figures 1 to 2 The motor boost charging mode will be described.

[0153] Referring to Figures 1 to 2 , in an embodiment, the motor boost discharging mode includes:

[0154] In the third energy storage stage, the controller controls the main positive switch S1 and the first buck switch S6 to conduct, and controls the main negative switch S2, the fast charging positive switch S4, the first boost switch S5, and the second buck switch S7 to disconnect; and controls the first upper bridge arm switch of the inverter to conduct, and controls the remaining bridge arm switches of the inverter to disconnect. The first upper bridge arm switch is any one or both of the two upper bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and power distribution module 30; and / or,

[0155] In the boost discharging stage, the controller controls the fast charging positive switch S4, the first buck switch S6, and the second buck switch S7 to conduct, and controls the main positive switch S1, the first boost switch S5, and the main negative switch S2 to disconnect; and controls the first lower bridge arm switch of the inverter to conduct, and controls the remaining bridge arm switches of the inverter to disconnect, or controls all the bridge arm switches of the inverter to disconnect. The first lower bridge arm switch is connected to the same phase winding as the first upper bridge arm switch.

[0156] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the third energy storage stage, the voltage output by the battery can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switches to conduct or disconnect in the boost discharging stage, the third stored energy in the motor winding and the voltage output by the battery can be superimposed and then output to an external device for charging.

[0157] It should be noted that in this embodiment, controlling the first upper bridge arm switch and the first lower bridge arm switch to conduct can be to control the bridge arm switches to conduct and disconnect with a preset duty cycle. The specific duty cycle can be set according to the charge and discharge relationship in different stages of the motor buck charging mode in this embodiment and with reference to the description of the voltage on the inductor in the above embodiment.

[0158] Further, in this embodiment, the third energy storage stage and the boost discharge stage in the motor boost discharge mode can be combined in two stages to achieve the effect of boost discharge. For example, if entering the third energy storage stage first and then the boost discharge stage, the voltage output by the battery can be first transmitted to the motor winding for energy storage, and when the third energy storage energy reaches the third preset energy value, it is switched to the boost discharge stage. The third energy storage energy in the motor winding is superimposed with the power supply voltage of the battery and then output to an external device for charging. In this way, when the charging voltage of the battery is less than the output voltage of the external device, the output voltage of the battery can be boosted through the combination of the two stages in the motor boost discharge mode and then output to the external device for charging. It can be understood that the third preset energy value can be the voltage value that the battery needs to increase. For example, when the output voltage of the battery is 500V and the requested charging voltage of the external device is 700V, the output voltage of the battery can be stepped down by the motor winding, 200V voltage can be stored and then superimposed with the output voltage of the battery to charge the external device. Specifically, the energy storage and charging speed of the winding can be tested in advance. After the charging time of the winding reaches the preset time, the motor winding is controlled to release energy, and after the energy release time of the winding reaches the preset time, the motor winding is charged. The specific control principle of the motor boost discharge mode can refer to the description of this embodiment, and the user can also adjust the circuit structure and charging time according to actual needs, which is not limited here. In this way, this embodiment can achieve the charging of an external device with a high charging voltage by a battery with a low output voltage. The user can also combine or expand multiple stages of the motor boost discharge mode according to actual needs. The specific principle can refer to the above description, which is not limited here.

[0159] It should be noted that in another embodiment, in the motor boost discharge mode, the charging and discharging module 30 includes a fast charging positive switch S4, a first buck switch S6, a second buck switch S7, and a first boost switch S5. The fast charging positive switch S4 is connected between the battery positive connection end and the external device. The first boost switch S5 is connected between the battery negative connection end and the external device. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection end. The second buck switch S7 is connected between the second end of the main negative switch S2 and the negative end of the charging and discharging module 30. The negative end of the charging and discharging module 30 is connected to the first end of the three-phase winding.

[0160] Refer to Figures 1 to 2 , in one embodiment, the motor boost discharge mode includes:

[0161] In the third energy storage stage, the controller controls the main positive switch S1 and the first buck switch S6 to conduct, and controls the main negative switch S2, the fast charge positive switch S4, the first boost switch S5, and the second buck switch S7 to disconnect; and controls at least one upper arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect; and / or,

[0162] In the boost discharge stage, the controller controls the fast charge positive switch S4, the first buck switch S6, and the second buck switch S7 to conduct, and controls the main positive switch S1, the first boost switch S5, and the main negative switch S2 to disconnect; and controls the lower arm switch of the same phase winding as the upper arm switch that conducts in the third energy storage stage of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0163] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the third energy storage stage, the voltage output by the battery can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switches to conduct or disconnect in the boost discharge stage, the third energy storage energy in the motor winding and the voltage output by the battery can be superimposed and then output to an external device for charging.

[0164] It can be understood that when the negative terminal of the power distribution and charging module 30 is connected to the first end of the three-phase winding, there are differences between the controller controlling the upper arm switch and the lower arm switch of the inverter to conduct and the case where the negative terminal of the power distribution and charging module 30 is connected to the second end of any one of the three-phase windings. For example, in this embodiment, when the negative terminal of the power distribution and charging module 30 is connected to the first end of the three-phase winding, jitter during the charging process can be prevented; it can also make the control of the arm switches more flexible. For example, when the negative terminal of the power distribution and charging module 30 is connected to the second end of any one of the three-phase windings, at most two upper arm switches or lower arm switches can be controlled to conduct, while in this embodiment, at most three upper arm switches or lower arm switches can be controlled to conduct. In this way, the overall voltage of the three-phase winding can be changed, thereby changing the energy storage and energy release speeds of the three-phase winding; for example, the more arm switches that conduct, the higher the overall voltage of the three-phase winding, and the faster the energy storage and energy release speeds of the three-phase winding. The specific number of arm switches that conduct can be determined according to the actual voltage requirements of the user. Motor boost discharge can be achieved in both connection methods.

[0165] Refer to Figures 1 to 2 , in an embodiment, the controller is configured to control the inverter to transmit the power supply voltage output by the battery to the motor winding for energy storage when receiving the control signal of the motor buck discharge mode, and control the inverter to output the fourth energy storage energy of the motor winding to an external device for charging.

[0166] In this embodiment, when the vehicle's battery needs to discharge to an external device and the requested charging voltage of the external device is less than the output voltage of the battery, it is necessary to step down the output voltage of the battery before charging the external device. Therefore, the management device can first judge the voltage magnitude. When the output voltage of the battery is greater than the charging voltage of the external device, it can be determined to enter the step-down discharge mode. For example, when the output voltage of the battery is 700V and the requested charging voltage of the external device is 400V, it is necessary to enter the motor step-down discharge mode. At this time, the management device can output a control signal for the motor step-down discharge mode to the controller; the controller can then step down the power of the battery through the control of the power distribution and charging module 30, the inverter, and the motor winding and output it to the external device for charging. This can be applicable to the situation where the vehicle output voltage is higher than the requested charging voltage of the external device, avoiding overcharging or damage to the battery in the external device caused by the relatively high vehicle output voltage and affecting the user experience.

[0167] In an exemplary technology, the power distribution and charging module 30 includes a fast charging positive switch S4, a first step-down switch S6, a second step-down switch S7, and a first boost switch S5. The fast charging positive switch S4 is connected between the battery positive connection end and the external device. The first boost switch S5 is connected between the battery negative connection end and the external device. The first step-down switch S6 is connected between the first boost switch S5 and the battery negative connection end. The second step-down switch S7 is connected between the second end of the main negative switch S2 and the negative extreme of the power distribution and charging module 30. The negative extreme of the power distribution and charging module 30 is connected to the second end of any one of the three-phase windings.

[0168] Refer to Figures 1 to 2 , in one embodiment, the motor step-down discharge mode includes:

[0169] The fourth energy storage stage, the controller controls the fast charging positive switch S4, the first boost switch S5, and the main negative switch S2 to conduct, controls the main positive switch S1, the first step-down switch S6, and the second step-down switch S7 to disconnect, and controls the first lower arm switch of the inverter to conduct. The first lower arm switch is any one or two of the two lower arm switches corresponding to the two-phase windings not connected to the negative extreme of the power distribution and charging module 30; and / or,

[0170] The step-down discharge stage, the controller controls the fast charging positive switch S4, the main positive switch S1, and the first boost switch S5 to conduct, controls the main negative switch S2, the first step-down switch S6, and the second step-down switch S7 to disconnect; and controls the first upper arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect. The first lower arm switch and the first upper arm switch are connected to the same phase winding.

[0171] In this embodiment, when the controller controls the corresponding switch to conduct or disconnect during the fourth energy storage stage, the voltage output by the battery can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switch to conduct or disconnect during the step-down discharge stage, the fourth energy storage energy in the motor winding can be output to an external device for charging.

[0172] It should be noted that in this embodiment, controlling the first upper bridge arm switch and the first lower bridge arm switch to conduct can be to control the conduction and disconnection of the bridge arm switch with a preset duty cycle. The specific duty cycle can be set according to the charge-discharge relationship in different stages of the motor step-down charging mode in this embodiment and with reference to the description of the voltage on the inductor in the above embodiment.

[0173] Further, in this embodiment, the fourth energy storage stage and the step-down discharge stage in the motor step-down discharge mode can be combined in two stages to achieve the effect of step-down discharge. For example, if it first enters the fourth energy storage stage and then enters the step-down charging stage, the voltage output by the battery can be first transmitted to the motor winding for energy storage, and when the fourth energy storage energy reaches the fourth preset energy value, it switches to the step-down discharge stage, and the fourth energy storage energy in the motor winding is output to an external device for charging. In this way, when the charging voltage of the battery is greater than the output voltage of the external device, the output voltage of the battery can be stepped down through the combination of the two stages in the motor step-down charging mode and then output to the external device for charging. It can be understood that the fourth preset energy value can be the charging voltage value of the external device. For example, when the output voltage of the battery is 700V and the charging voltage of the external device is 500V, the 700V voltage can be stepped down through the motor winding, and 500V voltage can be stored for charging the external device. Specifically, the energy storage charging speed of the winding can be tested in advance. After the energy storage time of the winding reaches the preset time, the motor winding is controlled to release energy, and after the energy release time of the winding reaches the preset time, the motor winding is charged. The specific control principle of the motor step-down discharge mode can be referred to the description of this embodiment, and the user can also adjust the circuit structure, charging time, etc. according to actual needs, which is not limited here. In this way, this embodiment can achieve the charging of an external device with a high charging voltage by a battery with a low output voltage.

[0174] The user can also combine or expand multiple stages of the motor step-down discharge mode according to actual needs. The specific principle can be referred to the above description, which is not limited here.

[0175] It should be noted that in another embodiment, in the motor step-down discharge mode, the charging and power distribution module 30 includes a fast charge positive switch S4, a first step-down switch S6, a second step-down switch S7, and a first boost switch S5. The fast charge positive switch S4 is connected between the battery positive connection terminal and the external device. The first boost switch S5 is connected between the battery negative connection terminal and the external device. The first step-down switch S6 is connected between the first boost switch S5 and the battery negative connection terminal. The second step-down switch S7 is connected between the second end of the main negative switch S2 and the negative terminal of the charging and power distribution module 30. The negative terminal of the charging and power distribution module 30 is connected to the first end of the three-phase winding.

[0176] Referring to Figures 1 to 2 , in one embodiment, the motor step-down discharge mode includes:

[0177] The fourth energy storage stage, where the controller controls the fast charge positive switch S4, the first boost switch S5, and the main negative switch S2 to conduct, controls the main positive switch S1, the first step-down switch S6, and the second step-down switch S7 to disconnect, and controls at least one lower arm switch of the inverter to conduct; and / or,

[0178] The step-down discharge stage, where the controller controls the fast charge positive switch S4, the main positive switch S1, and the first boost switch S5 to conduct, controls the main negative switch S2, the first step-down switch S6, and the second step-down switch S7 to disconnect; and controls the lower arm switch of the same phase winding as the upper arm switch that conducts in the fourth energy storage stage of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0179] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the fourth energy storage stage, the voltage output by the battery can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switches to conduct or disconnect in the step-down discharge stage, the fourth energy storage energy in the motor winding can be output to the external device for charging.

[0180] It can be understood that when the negative terminal of the charging and discharging module 30 is connected to the first end of the three-phase winding, there are differences in the control of the upper-bridge-arm switch and the lower-bridge-arm switch of the inverter by the controller compared with the case where the negative terminal of the charging and discharging module 30 is connected to the second end of any one of the three-phase windings. For example, in this embodiment, when the negative terminal of the charging and discharging module 30 is connected to the first end of the three-phase winding, jitter during charging can be prevented; it can also make the control of the bridge-arm switch more flexible. For example, when the negative terminal of the charging and discharging module 30 is connected to the second end of any one of the three-phase windings, at most two upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct, while in this embodiment, at most three upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct. In this way, the overall voltage of the three-phase winding can be changed, thereby changing the energy storage and energy release speeds of the three-phase winding. For example, the more bridge-arm switches that are conducting, the higher the overall voltage of the three-phase winding, and the faster the energy storage and energy release speeds of the three-phase winding. The specific number of conducting bridge-arm switches can be determined according to the actual voltage requirements of the user. Motor step-down discharge can be achieved in both connection methods.

[0181] In one embodiment, the controller is configured to control the motor module and the charging and discharging module 30 to heat the battery when receiving a control signal of the battery pulse charge-discharge heating mode.

[0182] In this embodiment, since the discharge capacity of the battery will be reduced when the battery temperature in the vehicle is relatively low, which affects the working state of the vehicle. The battery temperature can be detected, and when it is lower than a preset value, the management device outputs a control signal of the battery pulse charge-discharge heating mode to the controller. The specific preset temperature can be set according to the battery type and user requirements. The controller can then control the battery to charge the motor winding, and then control the motor winding to charge the battery. Repeating the above process means repeatedly charging and discharging the battery, so that pulses can be generated to heat the battery.

[0183] In one embodiment, the battery pulse charge-discharge heating mode includes a first battery pulse charge-discharge heating mode. The charging and discharging module 30 includes a first buck switch S6 and a first capacitor C1. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection terminal. The first capacitor C1 is connected between the first bus connection end and the second bus connection end of the inverter. The negative terminal of the charging and discharging module 30 is connected to the second end of any one of the three-phase windings.

[0184] Refer to Figures 1 to 2 , in one embodiment, the first battery pulse charge-discharge heating mode includes:

[0185] In the fifth energy storage stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the first upper arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect. The first upper arm switch is any one or both of the two upper arm switches corresponding to the two-phase windings not connected to the negative extreme of the charging and power distribution module 30; and / or,

[0186] In the sixth energy storage stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the first lower arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect. The first lower arm switch is connected to the same phase winding as the first upper arm switch; and / or,

[0187] In the first energy release stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the first lower arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect. The first lower arm switch is connected to the same phase winding as the first upper arm switch; and / or,

[0188] In the second energy release stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the upper arm switch that conducts in the fifth energy storage stage of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0189] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the fifth energy storage stage, the voltage output by the battery can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switches to conduct or disconnect in the sixth energy storage stage, the power supply voltage output by the battery can be transmitted to the first capacitor C1 for energy storage. When the controller controls the corresponding switches to conduct or disconnect in the first energy release stage, the voltage output by the first capacitor C1 can be transmitted to the battery for charging. When the controller controls the corresponding switches to conduct or disconnect in the second energy release stage, the voltage output by the motor winding can be transmitted to the battery for charging.

[0190] It should be noted that in this embodiment, controlling the first upper arm switch and the first lower arm switch to conduct can be to control the conduction and disconnection of the arm switch with a preset duty ratio. The specific duty ratio can be set according to the charge and discharge relationship in different stages of the first battery pulse charge and discharge heating mode in this embodiment and with reference to the description of the voltage on the inductor in the above embodiment.

[0191] Further, in this embodiment, the fifth energy storage stage, the sixth energy storage stage, the first energy release stage, and the second energy release stage in the first battery pulse charge and discharge heating mode can be combined to achieve different effects. For example, the fifth energy storage stage, the sixth energy storage stage, the first energy release stage, and the second energy release stage are sequentially cycled; the power supply voltage output by the battery can be transmitted to the motor winding for energy storage in the fifth energy storage stage, and when the fifth energy storage energy reaches a fifth preset energy value, it can be switched to the sixth energy storage stage. The fifth preset energy value can be the voltage value required for heating the battery; then the power supply voltage output by the battery is transmitted to the first capacitor C1 for energy storage until the voltage of the first capacitor C1 reaches the voltage output by the battery, and then it is switched to the first energy release stage; at this time, the voltage output by the first capacitor C1 is transmitted to the battery until the voltage of the first capacitor C1 is lower than the sixth preset energy value, and then it is switched to the second energy release stage; then the voltage output by the motor winding is transmitted to the battery until the sixth energy storage energy of the motor winding is lower than the seventh preset energy value, and then it is switched to the third energy storage stage; in this embodiment, the first capacitor C1 of the motor module 20 can be used for energy storage and energy release, and the battery is heated by charging and discharging the first capacitor C1, which is the first battery pulse charge and discharge heating mode. In this embodiment, specifically, the energy storage charging speed of the winding can be tested in advance. After the energy charging time of the winding reaches the preset time, the motor winding is controlled to release energy, and after the energy release time of the winding reaches the preset time, the motor winding is charged. It should be noted that the fifth preset energy value to the seventh preset energy value in this embodiment can be set according to the energy value required for pulse heating of the battery in actual applications. If the energy is too small, the heating efficiency may be low; if the energy is too large, the temperature may rise too fast and damage the battery. The specific energy value can be obtained according to the heat capacity (C) of the battery and the temperature to be increased (ΔT). For example, the following formula is used to calculate the required heating energy (Q): Q = C * ΔT. Therefore, the fifth preset energy value can be the heating energy required by the battery, the sixth preset energy value can be 0, which means that the energy in the first capacitor C1 is transmitted to the battery at this time, and the seventh preset energy value can be 0, which means that the energy in the motor winding is transmitted to the battery at this time. The sixth preset energy value and the seventh preset energy value can also be other values, which are not limited here, but need to be lower than the fifth preset energy value, and the difference between the fifth preset energy value and the sixth preset energy value and the seventh preset energy value can meet the energy condition for heating the second battery pack. In this embodiment, during the process of repeatedly charging and discharging the battery, the first capacitor C1 is also repeatedly charged and discharged, thereby generating ripples to heat the battery. It can be applied to the situation where the ambient temperature is relatively low.

[0192] Users can also combine or expand multiple stages in the first battery pulse charge-discharge heating mode according to actual needs. For other combination methods of multiple stages, specific working principles, control of the duty cycle of the leg switches, and setting of the preset energy values of multiple stages, reference can be made to the descriptions in the above embodiments, which will not be elaborated here.

[0193] It should be noted that in another embodiment, in the first battery pulse charge-discharge heating mode, the power conversion and distribution module 30 includes a first buck switch S6 and a first capacitor. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection terminal. The first capacitor is connected between the first busbar end and the second busbar end of the inverter. The negative terminal of the power conversion and distribution module 30 is connected to the first end of the three-phase winding.

[0194] Refer to Figures 1 to 2 , in one embodiment, the first battery pulse charge-discharge heating mode includes:

[0195] The fifth energy storage stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls at least one upper leg switch of the inverter to conduct, and controls the remaining leg switches of the inverter to disconnect; and / or,

[0196] The sixth energy storage stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the lower leg switch of the same phase winding as the upper leg switch that conducts in the fifth energy storage stage of the inverter to conduct, controls the remaining leg switches of the inverter to disconnect, or controls all leg switches of the inverter to disconnect; and / or,

[0197] The first energy release stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the lower leg switch of the same phase winding as the upper leg switch that conducts in the fifth energy storage stage of the inverter to conduct, controls the remaining leg switches of the inverter to disconnect; and / or,

[0198] The second energy release stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the upper leg switch that conducts in the fifth energy storage stage of the inverter to conduct, controls the remaining leg switches of the inverter to disconnect, or controls all leg switches of the inverter to disconnect.

[0199] In this embodiment, when the controller controls the corresponding switch to conduct or disconnect in the fifth energy storage stage, the voltage output by the battery can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switch to conduct or disconnect in the sixth energy storage stage, the power supply voltage output by the battery can be transmitted to the first capacitor C1 for energy storage. When the controller controls the corresponding switch to conduct or disconnect in the first energy release stage, the voltage output by the first capacitor C1 can be transmitted to the battery for charging. When the controller controls the corresponding switch to conduct or disconnect in the second energy release stage, the voltage output by the motor winding can be transmitted to the battery for charging.

[0200] It can be understood that when the negative terminal of the power charging and distribution module 30 is connected to the first end of the three-phase winding, there are differences between the controller controlling the upper-bridge-arm switch and the lower-bridge-arm switch of the inverter to conduct and the situation where the negative terminal of the power charging and distribution module 30 is connected to the second end of any one of the three-phase windings. For example, in this embodiment, when the negative terminal of the power charging and distribution module 30 is connected to the first end of the three-phase winding, jitter during the charging process can be prevented; it can also make the control of the bridge-arm switch more flexible. For example, when the negative terminal of the power charging and distribution module 30 is connected to the second end of any one of the three-phase windings, at most two upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct, while in this embodiment, at most three upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct. In this way, the overall voltage of the three-phase winding can be changed, thereby changing the energy storage and energy release speeds of the three-phase winding. For example, the more bridge-arm switches that are conducted, the higher the overall voltage of the three-phase winding, and the faster the energy storage and energy release speeds of the three-phase winding. The specific number of conducted bridge-arm switches can be determined according to the actual voltage requirements of the user. Battery pulse charge and discharge heating can be achieved in both connection methods. And for other combination methods, specific working principles, control of the duty cycle of the bridge-arm switch, and setting of the preset energy values in multiple stages, reference can be made to the description of the above embodiments, which will not be elaborated here.

[0201] In one embodiment, the battery pulse charge and discharge heating mode includes a second battery pulse charge and discharge heating mode. The power charging and distribution module 30 includes a first buck switch S6, a capacitor switch S8, and a second capacitor. The capacitor switch S8 is connected between the fast charge positive switch S4 and the first end of the second capacitor. The second end of the second capacitor is connected to the negative terminal of the power charging and distribution module 30. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection end. The negative terminal of the power charging and distribution module 30 is connected to the second end of any one of the three-phase windings.

[0202] Refer to Figures 1 to 2 , in one embodiment, the second battery pulse charge and discharge heating mode includes:

[0203] In the seventh energy storage stage, the controller controls the first buck switch S6 and the main negative switch S2 to conduct, and controls the main positive switch S1 to disconnect; and controls the first lower arm switch of the inverter to conduct, and controls the remaining arm switches of the inverter to disconnect; the first lower arm switch is any one or both of the two lower arm switches corresponding to the two-phase windings not connected to the negative terminal of the power charging and distribution module 30; and / or,

[0204] In the eighth energy storage stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the first upper arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect, the first upper arm switch and the first lower arm switch are connected to the same phase winding; and / or,

[0205] In the third energy release stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the first upper arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, the first upper arm switch and the first lower arm switch are connected to the same phase winding; and / or,

[0206] In the fourth energy release stage, the controller controls the first buck switch S6 and the main negative switch S2 to conduct, controls the main positive switch S1 to disconnect, and controls the lower arm switch that conducts in the seventh energy storage stage of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0207] In this embodiment, when the controller controls the corresponding switches to conduct or disconnect in the seventh energy storage stage, the voltage output by the battery can be transmitted to the second capacitor C2 and the motor winding for energy storage. When the controller controls the corresponding switches to conduct or disconnect in the eighth energy storage stage, the voltage output by the second capacitor C2 can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switches to conduct or disconnect in the third energy release stage, the voltage output by the motor winding can be transmitted to the second capacitor C2 for charging. When the controller controls the corresponding switches to conduct or disconnect in the fourth energy release stage, the voltage output by the second capacitor C2 and the motor winding can be transmitted to the battery for charging.

[0208] It should be noted that in this embodiment, controlling the first upper arm switch and the first lower arm switch to conduct can be to control the conduction and cut-off of the arm switch with a preset duty ratio. The specific duty ratio can be set according to the charge-discharge relationship in different stages of the second battery pulse charge-discharge heating mode in this embodiment and with reference to the description of the voltage on the inductor in the above embodiment.

[0209] Further, in this embodiment, the seventh energy storage stage, the eighth energy storage stage, the third energy release stage, and the fourth energy release stage in the second battery pulse charge and discharge heating mode can be combined to achieve different effects. For example, the seventh energy storage stage, the eighth energy storage stage, the third energy release stage, and the fourth energy release stage are sequentially cycled; the power supply voltage output by the battery can be transmitted to the second capacitor C2 and the motor winding for energy storage in the seventh energy storage stage, and switched to the sixth energy storage stage when the seventh energy storage energy reaches the eighth preset energy value; then the power supply voltage output by the second capacitor C2 is transmitted to the motor winding for energy storage until the voltage of the motor winding exceeds the voltage output by the battery and then switched to the third energy release stage; at this time, the voltage output by the motor winding is transmitted to the second capacitor C2 until the voltage of the motor winding is lower than the voltage of the second capacitor C2 and then switched to the fourth energy release stage; then the voltage output by the second capacitor C2 and the motor winding is transmitted to the battery until the voltage of the motor winding is lower than the ninth preset energy value and then switched to the fifth energy storage stage; in this embodiment, the second capacitor C2 of the charging and power distribution module 30 can be used for energy storage and energy release, and ripples can be generated by charging and discharging the second capacitor C2 to heat the battery. Thus, this is the second battery pulse charge and discharge heating mode. When receiving the control signal of the second battery pulse charge and discharge heating mode, the controller controls the charging and power distribution module 30, the inverter, the battery, and the motor winding to repeat the process of charging and discharging the second capacitor C2 according to the above control actions. In this way, an AC excitation with a certain frequency and amplitude can be applied to the positive and negative electrodes of the second capacitor C2 to generate ripples to achieve heating of the battery. Specifically, the energy storage charging speed of the winding can be tested in advance, the motor winding is controlled to release energy after the energy charging time of the winding reaches the preset time, and the motor winding is charged after the energy release time of the winding reaches the preset time. The eighth preset energy value can be the voltage value required for heating the battery; the ninth preset energy value can be the voltage value when the energy of the motor winding is released completely or reaches a certain level. The specific principle can refer to the description in the first battery pulse charge and discharge heating mode in the above embodiment. Repeating the above process means repeatedly charging and discharging the second capacitor C2, and in this way, ripples can also be generated to heat the battery. In practical applications, users can set the energy conversion device to preferentially enter the first battery pulse charge and discharge heating mode or the second battery pulse charge and discharge heating mode according to their needs. Thus, through the battery pulse charge and discharge heating mode, the vehicle battery can be self-heated when the vehicle is in a low-temperature environment, so as to ensure the normal operation of the vehicle and avoid battery damage.

[0210] Users can also combine or expand multiple stages in the second battery pulse charge and discharge heating mode according to actual needs. The combination methods, specific working principles, and control of the duty cycle of the bridge arm switch, as well as the setting of the preset energy values of multiple stages, can refer to the description in the above embodiment and will not be elaborated here.

[0211] It should be noted that in another embodiment, in the second battery pulse charge and discharge heating mode, the power charging and distribution module 30 includes a first buck switch S6, a capacitor switch S8 and a second capacitor. The capacitor switch S8 is connected between the fast charge positive switch S4 and the first end of the second capacitor. The second end of the second capacitor is connected to the negative terminal of the power charging and distribution module 30. The first buck switch S6 is connected between the first boost switch S5 and the battery negative connection end. The negative terminal of the power charging and distribution module 30 is connected to the first end of the three-phase winding.

[0212] Refer to Figures 1 to 2 , in one embodiment, the second battery pulse charge and discharge heating mode includes:

[0213] The seventh energy storage stage, the controller controls the first buck switch S6 and the main negative switch S2 to conduct, controls the main positive switch S1 to disconnect; and controls at least one lower arm switch of the inverter to conduct, controls the remaining arm switches of the inverter to disconnect; and / or,

[0214] The eighth energy storage stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the upper arm switch of the same phase winding as the lower arm switch conducted by the inverter in the seventh energy storage stage to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect; and / or,

[0215] The third energy release stage, the controller controls the first buck switch S6 and the main positive switch S1 to conduct, controls the main negative switch S2 to disconnect, and controls the upper arm switch of the same phase winding as the lower arm switch conducted by the inverter in the seventh energy storage stage to conduct, controls the remaining arm switches of the inverter to disconnect; and / or,

[0216] The fourth energy release stage, the controller controls the first buck switch S6 and the main negative switch S2 to conduct, controls the main positive switch S1 to disconnect, and controls the lower arm switch conducted by the inverter in the seventh energy storage stage to conduct, controls the remaining arm switches of the inverter to disconnect, or controls all the arm switches of the inverter to disconnect.

[0217] In this embodiment, when the controller controls the corresponding switch to conduct or disconnect in the fifth energy storage stage, the voltage output by the battery can be transmitted to the second capacitor C2 and the motor winding for energy storage. When the controller controls the corresponding switch to conduct or disconnect in the sixth energy storage stage, the voltage output by the second capacitor C2 can be transmitted to the motor winding for energy storage. When the controller controls the corresponding switch to conduct or disconnect in the third energy release stage, the voltage output by the motor winding can be transmitted to the second capacitor C2 for charging. When the controller controls the corresponding switch to conduct or disconnect in the fourth energy release stage, the voltage output by the second capacitor C2 and the motor winding can be transmitted to the battery for charging.

[0218] It can be understood that when the negative terminal of the power charging and distribution module 30 is connected to the first end of the three-phase winding, there are differences between the controller controlling the upper-bridge-arm switch and the lower-bridge-arm switch of the inverter to conduct and the situation where the negative terminal of the power charging and distribution module 30 is connected to the second end of any one of the three-phase windings. For example, in this embodiment, when the negative terminal of the power charging and distribution module 30 is connected to the first end of the three-phase winding, jitter during the charging process can be prevented; it can also make the control of the bridge-arm switch more flexible. For example, when the negative terminal of the power charging and distribution module 30 is connected to the second end of any one of the three-phase windings, at most two upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct, while in this embodiment, at most three upper-bridge-arm switches or lower-bridge-arm switches can be controlled to conduct. In this way, the overall voltage of the three-phase winding can be changed, thereby changing the energy storage and release speeds of the three-phase winding. For example, the more bridge-arm switches that are conducted, the higher the overall voltage of the three-phase winding, and the faster the energy storage and release speeds of the three-phase winding. The specific number of conducted bridge-arm switches can be determined according to the actual voltage requirements of the user. Motor buck charging can be achieved in both connection methods. And for other combination methods, specific working principles, control of the duty cycle of the bridge-arm switch, and setting of the preset energy values in multiple stages, reference can be made to the description of the above embodiment, which will not be elaborated here.

[0219] In one embodiment, the power charging and distribution module 30 further includes:

[0220] A discharge circuit, the discharge circuit is connected in parallel between the first end and the second end of the second capacitor C2, and the discharge circuit is used to pre-charge the voltage of the second capacitor C2 before the energy conversion device enters the motor boost charging mode and discharge the voltage of the second capacitor C2 after the energy conversion device exits the motor boost charging mode.

[0221] In this embodiment, the discharge circuit may be composed of electrical components such as a resistor, a switch, a diode, and a capacitor. The discharge circuit can pre-charge the second capacitor C2 before the energy conversion device enters the boost charging mode. Specifically, it can be achieved by controlling the circuit in the energy conversion device to conduct the voltage of the battery to the capacitor for pre-charging. After the boost charging mode of the energy conversion device ends, it is also necessary to discharge the second capacitor C2, which is specifically completed by the electrical components in the discharge circuit connected in parallel at both ends of the second capacitor C2. It can be understood that for other capacitors or inductors in the energy conversion device, a discharge circuit can also be correspondingly set. After setting the discharge circuit, the second capacitor C2 and the capacitor switch S8 can exchange the series connection method.

[0222] Referring to Figures 1 to 2 , in one embodiment, the controller is further configured to control the power charging and distribution module 30 to output the power of the external device to the battery for charging through the battery connection circuit 10 when receiving the control signal of the direct charging mode.

[0223] In this embodiment, when the output voltage of the external device is greater than or equal to the charging request voltage of the battery in the vehicle, the battery can also be directly charged by the external device. Therefore, the voltage difference can be first judged by the management device. When the charging voltage of the battery is less than the output voltage of the external device, it is determined to enter the direct charging mode; for example, when the charging voltage of the battery is 500V and the output voltage of the charging pile or the external device is 550V, the direct charging mode can be entered. At this time, the controller can control the boost switch to disconnect, so as to disconnect the connection between the power charging and distribution module 30 and the motor winding, and directly output the voltage output by the external device to the battery for charging through the battery connection circuit 10.

[0224] In an exemplary technology, the power charging and distribution module 30 includes a fast charging positive switch S4, a first buck switch S6, a second buck switch S7, and a first boost switch S5. The fast charging positive switch S4 is connected between the positive electrode connection end of the battery and the external device, the first boost switch S5 is connected between the negative electrode connection end of the battery and the external device, the first buck switch S6 is connected between the first boost switch S5 and the negative electrode connection end of the battery, and the second buck switch S7 is connected between the second end of the main negative switch S2 and the negative extreme end of the power charging and distribution module 30.

[0225] In one embodiment, the direct charging mode includes:

[0226] In the first direct charging stage, when receiving the control signal of the direct charging mode, the controller is configured to control the fast charging positive switch S4, the first boost switch S5, and the first buck switch S6 to conduct, and control the main negative switch S2, the main positive switch S1, and the second buck switch S7 to disconnect; or,

[0227] In the second direct charging stage, when receiving the control signal of the direct charging mode, the controller is configured to control the fast charging positive switch S4, the second buck switch S7, and the main negative switch S2 to conduct, and control the first boost switch S5, the first buck switch S6, and the main positive switch S1 to disconnect.

[0228] In this embodiment, in the first direct charging stage or the second direct charging stage, the controller can control the corresponding switches to conduct or disconnect according to the above description, so as to output the power output by the external device to the battery for charging through the battery connection circuit 10. It can be understood that the circuit structure proposed by the energy conversion device in this specification can realize the direct charging of the battery by the external device through any one of the first direct charging stage and the second direct charging stage.

[0229] In this way, it can be applicable to the situation where the output voltage of the external device is greater than the charging request voltage of the battery in the vehicle, and it will not cause overcharging or damage to the battery in the vehicle.

[0230] Refer to Figures 4 to 8 , in an embodiment, the power charging and distribution module 30 further includes a first inductor L1 and a second boost switch S9. The second boost switch S9 is connected between the fast charging negative switch and any one of the three-phase windings and the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the negative extreme of the power charging and distribution module 30.

[0231] In this embodiment, the second boost switch S9 can be connected in series with the first inductor L1, and the first inductor L1 can also play a role in energy storage and energy release. It can store energy together with the second capacitor C2 in the power charging and distribution module 30 to increase the stored energy. By controlling the switching and conduction time of the second boost switch S9, the energy storage time during the operation of the energy conversion device can also be adjusted. For example, the longer the conduction time during the energy storage stage, the longer the energy storage time. In this way, the charging power of the energy conversion device in the boost charging mode, the discharging power of the buck discharging mode, and the heating power of the battery pulse charge and discharge heating mode can be improved.

[0232] Refer to Figures 1 to 10, in one embodiment, the energy conversion device further includes a pre-charge switch S3, a first resistor R1, a main fuse F1, and a shunt resistor RS; a first end of the main fuse F1 is connected to the battery positive connection end, a first end of the shunt resistor RS is connected to the battery negative connection end, a second end of the main fuse F1, a first end of the main positive switch S1, and a first end of the first resistor R1 are connected, a second end of the first resistor R1 is connected to a first end of the pre-charge switch S3, a second end of the main positive switch S1 and a second end of the pre-charge switch S3 are connected, and a second end of the shunt resistor RS is connected to a first end of the main negative switch S2.

[0233] In this embodiment, considering issues such as charging safety and stability in the energy conversion device, the energy conversion device can also be provided with devices such as a pre-charge switch S3, a first resistor R1, a main fuse F1, and a shunt resistor RS; by controlling the pre-charge switch S3 to form a pre-charge circuit, pre-charge the battery to ensure stable charging. The first resistor R1 can limit the current. The main fuse F1 can disconnect when the current in the circuit is too large to ensure circuit safety. The shunt resistor RS can detect the current in the circuit to determine whether there is overcurrent or undercurrent. The specific connection relationship of the above devices in this example can be used as a reference, and this specification does not make any restrictions.

[0234] Refer to Figures 1 to 10 , in one embodiment, the energy conversion device further includes:

[0235] A DC charging socket 40, through which the power distribution and charging module 30 and the battery connection circuit 10 are connected to external devices. The DC charging socket 40 can be a socket, which is used to enable the energy conversion device to be connected to external devices such as charging piles or other vehicles.

[0236] Refer to Figure 11 , in one embodiment, a positive end of the power distribution and charging module 30 is connected to a second end of the main fuse F1, and a negative end of the power distribution and charging module 30 is connected to a second end of the shunt resistor RS.

[0237] In this embodiment, connecting the positive end of the power distribution and charging module 30 to the second end of the main fuse F1 and the negative end of the power distribution and charging module 30 to the second end of the shunt resistor RS can enable the power distribution and charging module 30 and the battery connection circuit 10 to share the main fuse F1 and the shunt resistor RS, thereby protecting the circuit and collecting current.

[0238] In one embodiment, the first terminal of the capacitor switch S8 can be connected to the second terminal of the main positive switch S1, and the first terminal of the second buck switch S7 can be connected to the second terminal of the main negative switch S2; the fast charging positive switch S4 and the first buck switch S6 are arranged in the battery connection circuit 10. The first terminal of the fast charging positive switch S4 is connected to the battery positive connection terminal, and the second terminal of the fast charging positive switch S4 is used to connect to an external device; the first terminal of the first buck switch S6 is connected to the battery negative connection terminal, the second terminal of the first buck switch S6 is connected to the first terminal of the first boost switch S5, and the second terminals of the first boost switch S5 and the second buck switch S7 are used to connect to an external device. The specific circuit structure can refer to Figure 5 and Figure 6 . Figure 5 In Figure 5 , the first terminal of the second buck switch S7 is connected to the second terminal of the main negative switch in the battery connection circuit, while Figure 6 in Figure 6 , the first terminal of the second buck switch S7 is connected to the second terminal of the main negative switch in the battery connection circuit through the second busbar terminal of the inverter in the motor module 20. In this way, the battery positive connection terminal and the battery negative connection terminal of the battery connection circuit 10 are isolated from the output interface of the battery through the fast charging positive switch S4 and the first buck switch S6 respectively, so as to prevent the output interface of the battery from being continuously charged. The solution in this embodiment also has a motor drive mode, a direct charging mode, a motor boost charging mode, a motor buck charging mode, a motor boost discharging mode, a motor buck discharging mode, and a battery pulse charge and discharge heating mode.

[0239] In one embodiment, the fast charging positive switch S4 and the first buck switch S6 are arranged in the battery connection circuit 10. The first terminal of the fast charging positive switch S4 is connected to the battery positive connection terminal, the second terminal of the fast charging positive switch S4 and the first terminal of the capacitor switch S8 are used to connect to an external device, and the first terminal of the second buck switch S7 is connected to the second terminal of the main negative switch S2; the first terminal of the first buck switch S6 is connected to the battery negative connection terminal, the second terminal of the first buck switch S6 is connected to the first terminal of the first boost switch S5, and the second terminals of the first boost switch S5 and the second buck switch S7 are used to connect to an external device. The specific circuit structure can refer to Figure 7 ; in this way, the battery positive connection terminal and the battery negative connection terminal of the battery connection circuit 10 are isolated from the output interface of the battery through the fast charging positive switch S4 and the first buck switch S6 respectively, so as to prevent the output interface of the battery from being continuously charged. The solution in this embodiment also has a motor drive mode, a direct charging mode, a motor boost charging mode, a motor buck charging mode, a motor boost discharging mode, a motor buck discharging mode, and a battery pulse charge and discharge heating mode.

[0240] In one embodiment, the fast charging positive switch S4 and the first buck switch S6 are arranged in the battery connection circuit 10. The first end of the fast charging positive switch S4 is connected to the battery positive connection end. The second end of the fast charging positive switch S4 and the first end of the capacitor switch S8 are used to connect to an external device. The first end of the second buck switch S7 is connected to the second end of the main negative switch S2; the first end of the first buck switch S6 is connected to the battery negative connection end. The second end of the first buck switch S6 is connected to the second end of the capacitor switch S8. The second end of the second buck switch S7 is used to connect to an external device. The specific circuit structure can refer to Figure 8 ; thus, the battery positive connection end and the battery negative connection end of the battery connection circuit 10 are isolated from the output interface of the battery through the fast charging positive switch S4 and the first buck switch S6 respectively, so as to prevent the output interface of the battery from being continuously charged. The solution in this embodiment also has a motor drive mode, a direct charging mode, a motor boost charging mode, a motor buck charging mode, a motor boost discharging mode, a motor buck discharging mode, and a battery pulse charge and discharge heating mode.

[0241] In one embodiment, the first end of the first buck switch S6 can be connected to the battery positive connection end, the second end of the first buck switch S6 is connected to the first end of the first boost switch S5, the first end of the second buck switch S7 is connected to the second end of the main positive switch S1, the second ends of the first boost switch S5 and the second buck switch S7 are used to connect to an external device, the first end of the fast charging positive switch S4 is connected to the battery negative connection end, the second end of the fast charging positive switch S4 is used to connect to an external device, and the second buck switch S7 is connected to the second end of the main positive switch S1. The specific circuit structure can refer to Figure 9 and Figure 10 , Figure 9 The first end of the second boost switch S9 is connected to the second end of any one of the three-phase windings, Figure 10 or the first end of the second boost switch S9 is connected to the first end of the three-phase windings. The solution in this embodiment can also have a motor drive mode, a direct charging mode, a motor boost charging mode, a motor buck charging mode, a motor boost discharging mode, a motor buck discharging mode, and a battery pulse charge and discharge heating mode.

[0242] The present invention also provides a vehicle, including a battery module and the energy conversion device as described above. The positive pole of the battery module is connected to the battery positive connection end in the energy conversion device, and the negative pole of the battery module is connected to the battery negative connection end in the energy conversion device. The specific structure of the energy conversion device refers to the above embodiments. Since this vehicle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0243] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An energy conversion device, characterized in that: include: A battery connection circuit, comprising a battery positive connection terminal, a battery negative connection terminal, a main positive switch and a main negative switch for connecting a battery, wherein a first end of the main positive switch is connected to the battery positive connection terminal, and a first end of the main negative switch is connected to the battery negative connection terminal; A motor module, comprising an inverter and a motor winding, wherein a first bus terminal of the inverter is connected to a second terminal of the main positive switch, a second bus terminal of the inverter is connected to a second terminal of the main negative switch, and the motor winding comprises a three-phase winding, wherein first terminals of the three-phase windings are connected to each other, and second terminals of the three-phase windings are connected to neutral points of three-phase bridge arms of the inverter in a one-to-one correspondence; A charging and distribution module, having a positive terminal and a negative terminal for connecting an external device, wherein the positive terminal of the charging and distribution module is connected to the positive terminal of the battery or to the second terminal of the main positive switch, and the negative terminal of the charging and distribution module is connected to the negative terminal of the battery and / or the second terminal of the main negative switch, and the negative terminal of the charging and distribution module is also connected to the second terminal of any one phase of the three-phase winding or the first terminal of the three-phase winding; a controller, for controlling the charging and distribution module, the battery connection circuit and the motor module according to a control signal corresponding to the working mode, so that the energy conversion device operates in the corresponding working mode, wherein the working mode includes at least one of a motor driving mode for enabling a battery to supply power to a motor, a direct charging mode for enabling an external device to charge a battery, a motor boost charging mode and a motor buck charging mode, a motor boost discharge mode and a motor buck discharge mode for enabling a battery to charge an external device, and a battery pulse charge and discharge heating mode for heating a battery; A fast-charge positive switch, the fast-charge positive switch is connected between the second end of the main positive switch and an external device; or, the fast-charge positive switch is connected between the second end of the main negative switch and an external device; A first boost switch, wherein the first boost switch is connected between the negative electrode connection terminal of the battery and an external device; or, the first boost switch is connected between the positive electrode connection terminal of the battery and an external device; A first buck switch, wherein the first buck switch is connected between the first boost switch and the negative electrode connection terminal of the battery; or, the first buck switch is connected between the first boost switch and the positive electrode connection terminal of the battery; A second step-down switch, wherein the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module; or, the second step-down switch is connected between the second end of the main positive switch and the negative end of the charging and distribution module.

2. The energy conversion device according to claim 1, characterized in that: The charging and distribution module includes a fast charging positive switch, a first boost switch, a first buck switch and a second buck switch, the fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first boost switch is connected between the negative electrode connection terminal of the battery and an external device, the first buck switch is connected between the first boost switch and the negative electrode connection terminal of the battery, and the second buck switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module; the controller is used to control the fast charging positive switch, the first boost switch, the first buck switch and the second buck switch to be disconnected when receiving the control signal of the motor drive mode, so as to output the voltage output by the battery to the motor winding through the battery connection circuit.

3. The energy conversion device according to claim 1, characterized in that: The controller is used to control the charging and distribution module to connect to the power supply of the external device when receiving the control signal of the motor boost charging mode, and control the inverter to transmit the power supply voltage of the external device to the motor winding for energy storage, and control the inverter to superimpose the first energy storage energy of the motor winding and the power supply voltage of the external device and output them to the battery through the battery connection circuit for charging.

4. The energy conversion device according to claim 3, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the second end of any one phase of the three-phase winding.

5. The energy conversion device according to claim 4, characterized in that: The motor boost charging mode includes: In the first energy storage stage, the controller controls the fast charging positive switch, the first boost switch and the main positive switch to be turned on, controls the main negative switch, the first buck switch and the second buck switch to be turned off, and controls the first upper bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off, wherein the first upper bridge arm switch is any one or two of the two upper bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and distribution module; and / or, During the boost charging stage, the controller controls the fast charging positive switch, the first boost switch and the main negative switch to be turned on, and controls the main positive switch, the first buck switch and the second buck switch to be turned off; and controls the first lower bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off, and the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding.

6. The energy conversion device according to claim 3, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the first end of the three-phase winding.

7. The energy conversion device according to claim 4, characterized in that: The motor boost charging mode includes: In the first energy storage stage, the controller controls the fast charging positive switch, the first boost switch and the main positive switch to be turned on, controls the main negative switch, the first buck switch and the second buck switch to be turned off, and controls at least one upper arm switch of the inverter to be turned on, and controls the remaining arm switches of the inverter to be turned off; and / or, In the boost charging stage, the controller controls the fast charging positive switch, the first boost switch and the main negative switch to be turned on, and controls the main positive switch, the first buck switch and the second buck switch to be turned off; and controls the lower arm switch of the same phase winding as the upper arm switch of the inverter that is turned on in the first energy storage stage to be turned on, controls the remaining arm switches of the inverter to be turned off, or controls all arm switches of the inverter to be turned off.

8. The energy conversion device according to claim 1, characterized in that: The controller is used to control the charging and distribution module to connect to the power supply of the external device when receiving the control signal of the motor step-down charging mode, and control the inverter to transmit the power supply voltage of the external device to the motor winding for energy storage, and control the inverter to output the second energy storage energy of the motor winding to the battery through the battery connection circuit for charging.

9. The energy conversion device according to claim 8, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the second end of any one phase of the three-phase winding.

10. The energy conversion device according to claim 9, characterized in that: The motor step-down charging mode includes: In the second energy storage stage, the controller controls the fast charging positive switch, the first buck switch and the second buck switch to be turned on, controls the main negative switch, the first boost switch and the main positive switch to be turned off, and controls the first lower bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off, wherein the first lower bridge arm switch is any one of the two lower bridge arm switches corresponding to the two-phase winding not connected to the negative terminal of the charging and distribution module; and / or, During the step-down charging stage, the controller controls the first step-down switch and the main positive switch to be turned on, and controls the fast charging positive switch, the first boost switch, the second step-down switch and the main negative switch to be turned off; and controls the first upper bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off, and the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding.

11. The energy conversion device according to claim 8, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the first end of the three-phase winding.

12. The energy conversion device according to claim 11, characterized in that: The motor step-down charging mode includes: In the second energy storage stage, the controller controls the fast charging positive switch, the first buck switch and the second buck switch to be turned on, controls the main negative switch, the first boost switch and the main positive switch to be turned off, and controls at least one lower bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off; and / or, In the step-down charging stage, the controller controls the first step-down switch and the main positive switch to be turned on, and controls the fast charging positive switch, the first boost switch, the second step-down switch and the main negative switch to be turned off; and controls the upper arm switch of the same phase winding as the lower arm switch of the inverter that is turned on in the second energy storage stage to be turned on, controls the remaining arm switches of the inverter to be turned off, or controls all arm switches of the inverter to be turned off.

13. The energy conversion device according to claim 1, characterized in that: The controller is used to control the inverter to transmit the power supply voltage output by the battery to the motor winding for energy storage when receiving the control signal of the motor boost discharge mode, and to control the inverter to superimpose the third energy storage energy of the motor winding and the power supply voltage of the battery and output them to an external device for charging.

14. The energy conversion device according to claim 13, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the second end of any one phase of the three-phase winding.

15. The energy conversion device according to claim 14, characterized in that: The motor boost discharge mode includes: In the third energy storage stage, the controller controls the main positive switch and the first buck switch to be turned on, and controls the main negative switch, the fast charging positive switch, the first boost switch and the second buck switch to be turned off; and controls the first upper bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off, wherein the first upper bridge arm switch is any one or two of the two upper bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and distribution module; and / or, In the boost discharge stage, the controller controls the fast charging positive switch, the first buck switch and the second buck switch to be turned on, and controls the main positive switch, the first boost switch and the main negative switch to be turned off; and controls the first lower bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off, and the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding.

16. The energy conversion device according to claim 13, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the first end of the three-phase winding.

17. The energy conversion device according to claim 16, characterized in that: The motor boost discharge mode includes: In the third energy storage stage, the controller controls the main positive switch and the first buck switch to be turned on, and controls the main negative switch, the fast charging positive switch, the first boost switch and the second buck switch to be turned off; and controls at least one upper arm switch of the inverter to be turned on, and controls the remaining arm switches of the inverter to be turned off; and / or, In the boost discharge stage, the controller controls the fast charging positive switch, the first buck switch and the second buck switch to be turned on, and controls the main positive switch, the first boost switch and the main negative switch to be turned off; and controls the lower arm switch of the same phase winding as the upper arm switch of the inverter that is turned on in the third energy storage stage to be turned on, controls the remaining arm switches of the inverter to be turned off, or controls all arm switches of the inverter to be turned off.

18. The energy conversion device according to claim 1, characterized in that: The controller is used to control the inverter to transmit the power supply voltage output by the battery to the motor winding for energy storage when receiving the control signal of the motor step-down discharge mode, and control the inverter to output the fourth energy storage energy of the motor winding to an external device for charging.

19. The energy conversion device according to claim 18, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the second end of any one phase of the three-phase winding.

20. The energy conversion device according to claim 19, characterized in that: The motor voltage reduction discharge mode includes: In the fourth energy storage stage, the controller controls the fast charging positive switch, the first boost switch and the main negative switch to be turned on, controls the main positive switch, the first buck switch and the second buck switch to be turned off, and controls the first lower bridge arm switch of the inverter to be turned on, wherein the first lower bridge arm switch is any one or two of the two lower bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and distribution module; and / or, In the step-down discharge stage, the controller controls the fast charging positive switch, the main positive switch and the first boost switch to be turned on, and controls the main negative switch, the first buck switch and the second buck switch to be turned off; and controls the first upper bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off, and the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding.

21. The energy conversion device according to claim 18, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, and the negative end of the charging and distribution module is connected to the first end of the three-phase winding.

22. The energy conversion device according to claim 21, characterized in that: The motor voltage reduction discharge mode includes: In the fourth energy storage stage, the controller controls the fast charging positive switch, the first boost switch and the main negative switch to be turned on, controls the main positive switch, the first buck switch and the second buck switch to be turned off, and controls at least one lower bridge arm switch of the inverter to be turned on; and / or, In the step-down discharge stage, the controller controls the fast charging positive switch, the main positive switch and the first boost switch to be turned on, and controls the main negative switch, the first step-down switch and the second step-down switch to be turned off; and controls the lower arm switch of the same phase winding as the upper arm switch of the inverter that is turned on in the fourth energy storage stage to be turned on, controls the remaining arm switches of the inverter to be turned off, or controls all arm switches of the inverter to be turned off.

23. The energy conversion device according to claim 1, characterized in that: The controller is used to control the motor module and the charging and distributing module to heat the battery when receiving the control signal of the battery pulse charging and discharging heating mode.

24. The energy conversion device according to claim 23, characterized in that: The battery pulse charge and discharge heating mode includes a first battery pulse charge and discharge heating mode, and the charging and distribution module includes a first buck switch, a first boost switch, a fast charging positive switch, a second buck switch and a first capacitor. The fast charging positive switch is connected between the positive electrode connection end of the battery and an external device, the first boost switch is connected between the negative electrode connection end of the battery and an external device, the second buck switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, the first buck switch is connected between the first boost switch and the negative electrode connection end of the battery, the first capacitor is connected between the first bus terminal and the second bus terminal of the inverter, and the negative end of the charging and distribution module is connected to the second end of any one phase of the three-phase winding.

25. The energy conversion device according to claim 24, characterized in that: The first battery pulse charge-discharge heating mode includes: In the fifth energy storage stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the first upper bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off, wherein the first upper bridge arm switch is any one or two of the two upper bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and distribution module; and / or, In the sixth energy storage stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the first lower bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off, and the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and / or, In the first energy discharging stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the first lower bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off, and the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and / or, In the second energy discharge stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the upper bridge arm switch of the inverter that is turned on in the fifth energy storage stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off.

26. The energy conversion device according to claim 23, characterized in that: The battery pulse charge and discharge heating mode includes a first battery pulse charge and discharge heating mode, and the charging and distribution module includes a first buck switch, a first boost switch, a fast charging positive switch, a second buck switch and a first capacitor. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first boost switch is connected between the negative electrode connection terminal of the battery and an external device, the second buck switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, the first buck switch is connected between the first boost switch and the negative electrode connection terminal of the battery, the first capacitor is connected between the first bus terminal and the second bus terminal of the inverter, and the negative end of the charging and distribution module is connected to the first end of the three-phase winding.

27. The energy conversion device according to claim 26, characterized in that: The first battery pulse charge-discharge heating mode includes: In the fifth energy storage stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls at least one upper bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off; and / or, In the sixth energy storage stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the lower arm switch of the same phase winding as the upper arm switch of the inverter turned on in the fifth energy storage stage to be turned on, controls the remaining arm switches of the inverter to be turned off, or controls all arm switches of the inverter to be turned off; and / or, In the first energy discharging stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, controls the lower arm switch of the same phase winding as the upper arm switch of the inverter turned on in the fifth energy storing stage to be turned on, and controls the remaining arm switches of the inverter to be turned off; and / or, In the second energy discharge stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the upper bridge arm switch of the inverter that is turned on in the fifth energy storage stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off.

28. The energy conversion device according to claim 23, characterized in that: The battery pulse charge and discharge heating mode includes a second battery pulse charge and discharge heating mode, and the charging and distribution module includes a first step-down switch, a first boost switch, a fast charge positive switch, a second step-down switch, a capacitor switch and a second capacitor. The fast charge positive switch is connected between the positive electrode connection end of the battery and an external device, the first boost switch is connected between the negative electrode connection end of the battery and an external device, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, the capacitor switch is connected between the fast charge positive switch and the first end of the second capacitor, the second end of the second capacitor is connected to the negative end of the charging and distribution module, the first step-down switch is connected between the first boost switch and the negative electrode connection end of the battery, and the negative end of the charging and distribution module is connected to the second end of any one phase of the three-phase winding.

29. The energy conversion device according to claim 28, characterized in that: The second battery pulse charge-discharge heating mode includes: In the seventh energy storage stage, the controller controls the first buck switch and the main negative switch to be turned on, and controls the main positive switch to be turned off; and controls the first lower bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off; the first lower bridge arm switch is any one or two of the two lower bridge arm switches corresponding to the two-phase windings not connected to the negative terminal of the charging and distribution module; and / or, In the eighth energy storage stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the first upper bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off, and the first upper bridge arm switch and the first lower bridge arm switch are connected to the same phase winding; and / or, In the third energy release stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the first upper bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off, and the first upper bridge arm switch and the first lower bridge arm switch are connected to the same phase winding; and / or, In the fourth energy discharge stage, the controller controls the first buck switch and the main negative switch to be turned on, controls the main positive switch to be turned off, and controls the lower bridge arm switch of the inverter that is turned on in the seventh energy storage stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off.

30. The energy conversion device according to claim 23, characterized in that: The battery pulse charge and discharge heating mode includes a second battery pulse charge and discharge heating mode, and the charging and distribution module includes a first step-down switch, a first boost switch, a fast charge positive switch, a second step-down switch, a capacitor switch and a second capacitor. The fast charge positive switch is connected between the positive electrode connection end of the battery and an external device, the first boost switch is connected between the negative electrode connection end of the battery and an external device, the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module, the capacitor switch is connected between the fast charge positive switch and the first end of the second capacitor, the second end of the second capacitor is connected to the negative end of the charging and distribution module, the first step-down switch is connected between the first boost switch and the negative electrode connection end of the battery, and the negative end of the charging and distribution module is connected to the first end of the three-phase winding.

31. The energy conversion device according to claim 30, characterized in that: The second battery pulse charge-discharge heating mode includes: In the seventh energy storage stage, the controller controls the first buck switch and the main negative switch to be turned on, and controls the main positive switch to be turned off; and controls at least one lower bridge arm switch of the inverter to be turned on, and controls the remaining bridge arm switches of the inverter to be turned off; and / or, In the eighth energy storage stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the upper arm switch of the same phase winding as the lower arm switch of the inverter turned on in the seventh energy storage stage to be turned on, controls the remaining arm switches of the inverter to be turned off, or controls all arm switches of the inverter to be turned off; and / or, In the third energy discharging stage, the controller controls the first buck switch and the main positive switch to be turned on, controls the main negative switch to be turned off, and controls the upper arm switch of the same phase winding as the lower arm switch of the inverter turned on in the seventh energy storing stage to be turned on, and controls the remaining arm switches of the inverter to be turned off; and / or, In the fourth energy discharge stage, the controller controls the first buck switch and the main negative switch to be turned on, controls the main positive switch to be turned off, and controls the lower bridge arm switch of the inverter that is turned on in the seventh energy storage stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all bridge arm switches of the inverter to be turned off.

32. The energy conversion device according to any one of claims 28 or 30, characterized in that: The charging and distribution module also includes: A discharge circuit is connected in parallel to the first end and the second end of the second capacitor, and the discharge circuit is used to pre-charge the voltage of the second capacitor before the energy conversion device enters the motor boost charging mode, and discharge the voltage of the second capacitor after the energy conversion device exits the motor boost charging mode.

33. The energy conversion device according to claim 1, characterized in that: The controller is also used to control the charging and distribution module to output the power of the external device to the battery for charging through the battery connection circuit when receiving the control signal of the direct charging mode.

34. The energy conversion device according to claim 33, characterized in that: The charging and distribution module includes a fast charging positive switch, a first step-down switch, a second step-down switch and a first step-up switch. The fast charging positive switch is connected between the positive electrode connection terminal of the battery and an external device, the first step-up switch is connected between the negative electrode connection terminal of the battery and an external device, the first step-down switch is connected between the first step-up switch and the negative electrode connection terminal of the battery, and the second step-down switch is connected between the second end of the main negative switch and the negative end of the charging and distribution module.

35. The energy conversion device according to claim 34, characterized in that: The direct charging mode includes In the first direct charging stage, the controller is used to control the fast charging positive switch, the first boost switch and the first buck switch to be turned on, and control the main negative switch, the main positive switch and the second buck switch to be turned off when receiving the control signal of the direct charging mode; or In the second direct charging stage, the controller is used to control the fast charging positive switch, the second buck switch and the main negative switch to be turned on, and control the first boost switch, the first buck switch and the main positive switch to be turned off when receiving the control signal of the direct charging mode.

36. The energy conversion device according to claim 1, characterized in that: The battery connection circuit also includes a fast charging positive switch and a first step-down switch, and the charging and distribution module includes a first step-up switch, a capacitor switch and a second step-down switch. The first end of the capacitor switch is connected to the second end of the main positive switch, and the first end of the second step-down switch is connected to the second end of the main negative switch. The first end of the fast charging positive switch is connected to the positive electrode connection end of the battery, and the second end of the fast charging positive switch is used to connect an external device. The first end of the first step-down switch is connected to the negative electrode connection end of the battery, and the second end of the first step-down switch is connected to the first end of the first boost switch. The second end of the first boost switch and the second end of the second step-down switch are used to connect an external device.

37. The energy conversion device according to claim 1, characterized in that: The battery connection circuit also includes a fast charging positive switch and a first step-down switch, and the charging and distribution module includes a first step-up switch, a capacitor switch and a second step-down switch. The first end of the fast charging positive switch is connected to the positive electrode connection end of the battery, the second end of the fast charging positive switch and the first end of the capacitor switch are used to connect to an external device, and the first end of the second step-down switch is connected to the second end of the main negative switch; the first end of the first step-down switch is connected to the negative electrode connection end of the battery, the second end of the first step-down switch is connected to the first end of the first step-up switch, and the second end of the first step-up switch and the second end of the second step-down switch are used to connect to an external device.

38. The energy conversion device according to claim 1, characterized in that: The charging and distribution module includes a first step-down switch, a second step-down switch, a fast-charging positive switch, a first boost switch and a second boost switch. The first end of the first step-down switch is connected to the positive electrode connection end of the battery, the second end of the first step-down switch is connected to the first end of the first boost switch, the first end of the second step-down switch is connected to the second end of the main positive switch, the second end of the first boost switch and the second end of the second step-down switch are used to connect to an external device, the first end of the fast-charging positive switch is connected to the negative electrode connection end of the battery, the second end of the fast-charging positive switch is used to connect to an external device, and the second step-down switch is connected to the second end of the main positive switch.

39. The energy conversion device according to any one of claims 1 to 38, characterized in that: The charging and distribution module also includes a first inductor and / or a second boost switch, the second boost switch is connected between the three-phase winding and the first end of the first inductor, and the second end of the first inductor is connected to the negative terminal of the charging and distribution module.

40. The energy conversion device according to any one of claims 1 to 38, characterized in that: The energy conversion device also includes a pre-charging switch, a first resistor, a main fuse and a shunt; the first end of the main fuse is connected to the positive electrode connection end of the battery, the first end of the shunt is connected to the negative electrode connection end of the battery, the second end of the main fuse, the first end of the main positive switch and the first end of the first resistor are connected, the second end of the first resistor is connected to the first end of the pre-charging switch, the second end of the main positive switch is connected to the second end of the pre-charging switch, and the second end of the shunt is connected to the first end of the main negative switch.

41. The energy conversion device according to claim 40, characterized in that The positive terminal of the charging and distribution module is connected to the second end of the main fuse, and the negative terminal of the charging and distribution module is connected to the second end of the shunt.

42. A vehicle, characterized in that: It comprises a battery module and an energy conversion device as described in any one of claims 1 to 41, wherein the positive electrode of the battery module is connected to the positive electrode connection terminal of the battery in the energy conversion device, and the negative electrode of the battery module is connected to the negative electrode connection terminal of the battery in the energy conversion device.

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