Energy conversion device and vehicle

Abstract

The application discloses an energy conversion device and a vehicle, the device comprising a battery connection circuit, a motor module, a charging and power distribution module and a controller, the battery connection circuit comprising a first connection port connected with a battery and a first switch module, the first end of the first switch module being connected with the first connection port; in the motor module, the input end of an inverter is connected with the second end of the first switch module, the first ends of three-phase windings are connected with each other, and the second ends of the three-phase windings are connected with the neutral points of three-phase bridge arms of the inverter one by one; the charging and power distribution module has a second connection port connected with external equipment, the second connection port is connected with the first connection port or the second end of the first switch module, and the second connection port is also connected with the second end of any one of the three-phase windings; the controller can control the charging and power distribution module, the battery connection circuit and the motor module, and enable the energy conversion device to run in a corresponding working mode. The application aims to realize charging compatibility for vehicles with different charging voltage protocols.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an energy conversion device and a vehicle. BACKGROUND

[0002] The current battery system platform voltage of a vehicle is mostly below 450V. In order to improve the indicators such as endurance and power, an 800V or higher voltage power battery platform becomes the development direction of the subsequent whole vehicle. At present, most of the direct current fast charging piles have three specifications: 500V, 750V and 1000V.

[0003] Therefore, the new platform vehicle cannot be charged by using the 500V fast charging pile, and the power battery cannot be fully charged by using the 750V fast charging pile. In addition, the endurance mileage of the vehicle is short, the popularization rate of the charging pile is not high, and the problem of running out of power halfway and not being able to find a charging pile may occur. SUMMARY

[0004] The main purpose of the present application is to provide an energy conversion device and a vehicle, which aims to realize charging compatibility for vehicles with different charging voltage protocols.

[0005] In order to achieve the above purpose, the energy conversion device provided by the present application comprises:

[0006] A battery connection circuit comprising a first connection port for connecting a battery and a first switch module, a first end of the first switch module being connected with the first connection port;

[0007] A motor module comprising an inverter and a motor winding, an input end of the inverter being connected with a second end of the first switch module, the motor winding comprising three-phase windings, first ends of the three-phase windings being connected with each other, and second ends of the three-phase windings being connected with neutral points of three-phase bridge arms of the inverter one by one;

[0008] A charging and power distribution module having a second connection port for connecting an external device, the second connection port being connected with the first connection port or the second end of the first switch module, and the second connection port being further connected with the second end of any one of the three-phase windings or the first end of the three-phase windings;

[0009] A controller for controlling the charging and power distribution module, the battery connection circuit and the motor module according to a control signal corresponding to a working mode, so as to make the energy conversion device operate a corresponding working mode, the working mode comprising at least one of a motor driving mode for making the battery supply power to the motor, a direct charging mode and a motor boost charging mode for making the external device charge the battery, a motor step-down discharging mode for making the battery charge the external device, and a battery pulse charging and discharging heating mode for making the battery heat.

[0010] Optionally, the controller is configured to control the charging and power supply module to stop working to output the voltage output by the battery to the motor winding through the battery connection circuit when the control signal of the motor driving mode is received.

[0011] Optionally, the controller is configured to control the charging and power supply module to access the power supply of the external device and control the inverter to transmit the voltage of the power supply of the external device to the motor winding to store energy, and control the inverter to output the first energy stored by the motor winding and the voltage of the power supply of the external device to the battery through the battery connection circuit to charge the battery when the control signal of the motor voltage-boosting charging mode is received.

[0012] Optionally, the first switch module includes a main positive switch and a main negative switch, the charging and power supply module includes a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connection port and the external device, the fast charging negative switch is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch is connected between the first end of the first connection port and the first bus end of the inverter, the main negative switch is connected between the second end of the first connection port and the second bus end of the inverter, and the second connection port is connected to the second end of any one of the three-phase windings.

[0013] Optionally, the motor voltage-boosting charging mode includes:

[0014] In the first energy storage stage, the controller controls the fast charging positive switch and the main positive switch to be turned on, controls the main negative switch and the fast charging 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, the first upper bridge arm switch being any one or both of the two upper bridge arm switches corresponding to the two-phase winding pair not connected to the second connection port of the charging and power supply module; and / or,

[0015] In the voltage-boosting charging stage, the controller controls the fast charging positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charging 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, or controls all the bridge arm switches of the inverter to be turned off, the first lower bridge arm switch being connected to the same phase winding as the first upper bridge arm switch.

[0016] Optionally, the first switch module comprises a main positive switch and a main negative switch, the charging and power supply module comprises a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connecting port and an external device, the fast charging negative switch is connected between the second end of the second connecting port and the second end of the first connecting port, the main positive switch is connected between the first end of the first connecting port and the first bus end of the inverter, the main negative switch is connected between the second end of the first connecting port and the second bus end of the inverter, and the second connecting port is connected with the first end of the three-phase winding.

[0017] Optionally, the motor boost charging mode comprises:

[0018] a first energy storage stage, the controller controls the fast charging positive switch and the main positive switch to be turned on, controls the main negative switch and the fast charging 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,

[0019] a boost charging stage, the controller controls the fast charging positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charging negative switch to be turned off, and controls the lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter turned on in the first energy storage stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0020] Optionally, the controller is configured to, when receiving the control signal of the motor boost charging 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 second energy storage energy of the motor winding to an external device for charging.

[0021] Optionally, the first switch module comprises a main positive switch and a main negative switch, the charging and power supply module comprises a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connecting port and an external device, the fast charging negative switch is connected between the second end of the second connecting port and the second end of the first connecting port, the main positive switch is connected between the first end of the first connecting port and the first bus end of the inverter, the main negative switch is connected between the second end of the first connecting port and the second bus end of the inverter, and the second connecting port is connected with the second end of any one phase of the three-phase winding.

[0022] Optionally, the motor boost charging mode comprises:

[0023] In the second energy storage stage, the controller controls the fast charging positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charging negative switch to be turned off respectively, 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;

[0024] The first lower bridge arm switch is any one or two of the two upper bridge arm switches corresponding to the two-phase windings that are not connected to the second connection port of the charging and distribution module; and / or,

[0025] In the step-down discharge stage, the controller controls the fast-charging positive switch and the main positive switch to be turned on, controls the fast-charging negative 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 upper bridge arm switch and the first lower bridge arm switch are connected to the same phase winding.

[0026] Optionally, the first switch module includes a main positive switch and a main negative switch, and the charging and distribution module includes a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connection port and the external device, the fast charging negative switch is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch is connected between the first end of the first connection port and the first bus terminal of the inverter, the main negative switch is connected between the second end of the first connection port and the second bus terminal of the inverter, and the second connection port is connected to the first end of the three-phase winding.

[0027] Optionally, the motor voltage reduction discharge mode includes:

[0028] In the second energy storage stage, the controller controls the fast charge positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charge negative switch to be turned off respectively, and controls at least one lower arm switch of the inverter to be turned on, and controls the remaining arm switches of the inverter to be turned off; and / or,

[0029] In the step-down discharge stage, the controller controls the fast-charging positive switch and the main positive switch to be turned on, controls the fast-charging negative 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.

[0030] Optionally, the controller is configured to control the motor module and the charging and distribution module to heat the battery when receiving a control signal of the battery pulse charging and discharging heating mode.

[0031] Optionally, the battery pulse charging and discharging heating mode comprises a first battery pulse charging and discharging heating mode, the first switch module comprises a main positive switch and a main negative switch, the charging and power supply module comprises a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connecting port and an external device, the fast charging negative switch is connected between the second end of the second connecting port and the second end of the first connecting port, the main positive switch is connected between the first end of the first connecting port and the first bus end of the inverter, the main negative switch is connected between the second end of the first connecting port and the second bus end of the inverter, the motor module comprises a first capacitor, the first capacitor is connected in parallel between the first bus end and the second bus end of the inverter, and the second connecting port is connected with the second end of any one phase of the three-phase winding.

[0032] Optionally, the first battery pulse charging and discharging heating mode comprises:

[0033] a third energy storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive 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;

[0034] the first upper bridge arm switch is any one or both of two upper bridge arm switches corresponding to two-phase winding pairs which are not connected with the second connecting port of the charging and power supply module; and / or,

[0035] a fourth energy storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive 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 the bridge arm switches of the inverter to be turned off;

[0036] the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and / or,

[0037] a first energy releasing stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging 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;

[0038] the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and / or,

[0039] In the second energy releasing stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the upper bridge arm switch of the inverter in the third energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0040] Optionally, the battery pulse charging and discharging heating mode includes a first battery pulse charging and discharging heating mode, the first switch module includes a main positive switch and a main negative switch, the charging and power supply module includes a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connecting port and an external device, the fast charging negative switch is connected between the second end of the second connecting port and the second end of the first connecting port, the main positive switch is connected between the first end of the first connecting port and the first bus end of the inverter, the main negative switch is connected between the second end of the first connecting port and the second bus end of the inverter, the motor module includes a first capacitor, the first capacitor is connected in parallel between the first bus end and the second bus end of the inverter, and the second connecting port is connected with the first end of the three-phase winding.

[0041] Optionally, the first battery pulse charging and discharging heating mode includes:

[0042] In the third energy storing stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls at least one upper bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, and / or

[0043] In the fourth energy storing stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter in the third energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off, and / or

[0044] In the first energy releasing stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter in the third energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, and / or

[0045] In the second energy releasing stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the upper bridge arm switch of the inverter in the third energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0046] Optionally, the battery pulse charging and discharging heating mode includes a second battery pulse charging and discharging heating mode, the first switch module includes a main positive switch and a main negative switch, the charging and matching module includes a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connecting port and an external device, the fast charging negative switch is connected between the second end of the second connecting port and the second end of the first connecting port, the main positive switch is connected between the first end of the first connecting port and the first bus end of the inverter, the main negative switch is connected between the second end of the first connecting port and the second bus end of the inverter, the second connecting port includes a positive end and a negative end, the charging and matching module includes a second capacitor, the first end of the second capacitor is connected with the first end of the first connecting port or the fast charging positive switch, the second end of the second capacitor is connected with the fast charging negative switch, and the second connecting port is connected with the second end of any one phase of the three-phase winding.

[0047] Optionally, the second battery pulse charging and discharging heating mode includes:

[0048] In the fifth energy storing stage, the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging 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.

[0049] The first lower bridge arm switch is any one or both of two lower bridge arm switches corresponding to two-phase winding pairs which are not connected with the second connecting port of the charging and matching module; and / or,

[0050] In the sixth energy storing stage, the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging 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 the bridge arm switches of the inverter to be turned off.

[0051] The first upper bridge arm switch and the first lower bridge arm switch are connected to the same phase winding; and / or,

[0052] In the third energy releasing stage, the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging 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.

[0053] the first upper bridge arm switch and the first lower bridge arm switch are connected to the same phase winding; and / or,

[0054] the fourth energy releasing stage, the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the lower bridge arm switch of the inverter to be turned on in the fifth energy storing stage, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0055] Optionally, the battery pulse charging and discharging heating mode includes a second battery pulse charging and discharging heating mode, the first switch module includes a main positive switch and a main negative switch, the charging and matching module includes a fast charging positive switch and a fast charging negative switch, the fast charging positive switch is connected between the first end of the first connecting port and an external device, the fast charging negative switch is connected between the second end of the second connecting port and the second end of the first connecting port, the main positive switch is connected between the first end of the first connecting port and the first bus end of the inverter, the main negative switch is connected between the second end of the first connecting port and the second bus end of the inverter, the second connecting port includes a positive end and a negative end, the charging and matching module includes a second capacitor, the second capacitor is connected in series between the fast charging positive switch and the fast charging negative switch, and the second connecting port is connected with a first end of a three-phase winding.

[0056] Optionally, the second battery pulse charging and discharging heating mode includes:

[0057] the fifth energy storing stage, the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls at least one lower bridge arm switch of the inverter to be turned on, controls the remaining bridge arm switches of the inverter to be turned off; and / or,

[0058] the sixth energy storing stage, the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter to be turned on in the fifth energy storing stage, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off; and / or,

[0059] the third energy releasing stage, the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter to be turned on in the fifth energy storing stage, controls the remaining bridge arm switches of the inverter to be turned off; and / or,

[0060] In the fourth energy releasing stage, the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the inverter to be turned on at the fifth energy storing stage, controls the lower bridge arm switch of the inverter to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0061] Optionally, the charging and power supply module further comprises:

[0062] A discharge loop connected in parallel to the first end and the second end of the second capacitor, the discharge loop being used for pre-charging the second capacitor before the energy conversion device enters the boost charging mode and discharging the second capacitor after the energy conversion device exits the boost charging mode.

[0063] Optionally, the controller is further configured to, when receiving the control signal of the direct charging mode, control the charging and power supply module to output the power supply of the external device to the battery through the battery connection circuit for charging.

[0064] Optionally, the charging and power supply module comprises a boost switch, a fast charging positive switch and a fast charging negative switch, the fast charging positive switch being connected between the first end of the first connection port and the external device, the fast charging negative switch being connected between the second end of the second connection port and the second end of the first connection port, and the boost switch being connected between the fast charging negative switch and the second end of any one of the three-phase windings or the first end of the three-phase windings.

[0065] Optionally, the direct charging mode comprises:

[0066] In the direct charging stage, the controller controls the fast charging positive switch and the fast charging negative switch to be turned on, and controls the boost switch to be turned off.

[0067] Optionally, the energy conversion device further comprises:

[0068] A direct current charging seat, the charging and power supply module and the battery connection circuit being connected to the external device through the direct current charging seat.

[0069] Optionally, the direct current charging seat has a T-shaped interface, the T-shaped interface comprising a first end, a second end and a third end, the first end of the T-shaped interface being connected to the second connection port of the charging and power supply module, and the second end and the third end of the T-shaped interface being connected to the first connection port of the battery connection circuit, respectively.

[0070] Optionally, the energy conversion device further comprises a pre-charge switch, a first resistor, a main fuse and a shunt; a first end of the main fuse is connected with the positive electrode connection end of the battery, a first end of the shunt is connected with a second end of the first connection port of the battery connection circuit, 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 with 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 with a first end of the main negative switch.

[0071] Optionally, the second connection port comprises a positive electrode end and a negative electrode end, the positive electrode end is connected with the second end of the main fuse, and the negative electrode end is connected with the second end of the shunt.

[0072] The application further provides a vehicle comprising a battery module and the energy conversion device as described above, and the battery module is electrically connected with the first connection port of the battery connection circuit in the energy conversion device.

[0073] The energy conversion device comprising the battery connection circuit, the motor module, the charging and power supply module and the controller can convert the output voltage of the charging device or the output voltage of the vehicle, so that the low voltage output by the charging device is converted to high voltage and output to the battery in the vehicle for charging, or the low voltage output by the battery in the vehicle is converted to high voltage and output to the battery in other vehicle for charging. In this way, charging compatibility can be realized for vehicles with different charging voltage protocols, and one energy conversion device can have multiple working modes and be suitable for the situation that the voltage of the vehicle and the external device does not match. By changing the connection relationship between the second connection port of the charging and power supply module and the first connection port of the battery connection circuit and the first switch module, energy conversion devices with different structures can be formed and be suitable for different scenes. BRIEF DESCRIPTION OF DRAWINGS

[0074] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on the drawings shown.

[0075] Figure 1 FIG. 1 is a circuit structure schematic diagram of an embodiment of the energy conversion device of the present application;

[0076] Figure 2 FIG. 2 is a circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0077] Figure 3Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0078] Figure 4 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0079] Figure 5 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0080] Figure 6 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0081] Figure 7 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0082] Figure 8 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0083] Figure 9 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0084] Figure 10 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0085] Figure 11 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application;

[0086] Figure 12 Circuit structure schematic diagram of another embodiment of the energy conversion device of the present application.

[0087] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0088] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0089] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings). If the certain posture changes, the directional indications also change accordingly.

[0090] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0091] The current battery system platform voltage of vehicles is mostly below 450V. In order to improve indicators such as endurance and power, 800V or higher voltage power battery platform has become the development direction of subsequent vehicles. Currently, most DC fast charging piles have three specifications: 500V, 750V and 1000V.

[0092] Therefore, vehicles based on the new platform cannot be charged using 500V fast-charging stations, and 750V fast-charging stations cannot fully charge the power battery. Furthermore, the vehicles have a short range, and charging stations are not widely available. There is also the problem of running out of battery mid-route and being unable to find a charging station.

[0093] To solve the above problems, the present invention provides an energy conversion device.

[0094] Reference Figures 1 to 6 In one embodiment of the present invention, the energy conversion device includes:

[0095] The battery connection circuit 10 includes a first connection port for connecting a battery and a first switch module, wherein a first end of the first switch module is connected to the first connection port;

[0096] The motor module 20 includes an inverter and motor windings, wherein the input end of the inverter is connected to the second end of the first switch module, and 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 connected to the neutral points of the three-phase bridge arms of the inverter in a one-to-one correspondence;

[0097] The charging and distribution module 30 has a second connection port for connecting to an external device, the second connection port being connected to the first connection port or to the second end of the first switch module, and the second connection port being further connected to the second end of any phase of the three-phase winding or the first end of the three-phase winding;

[0098] The controller is configured to control the charging and power supply module 30, the battery connection circuit 10 and the motor module 20 according to a control signal corresponding to a working mode, so that the energy conversion device operates in the corresponding working mode. The working mode includes at least one of a motor driving mode for supplying power to the motor by the battery, a direct charging mode and a motor boost charging mode for charging the battery by the external device, a motor step-down discharging mode for charging the external device by the battery, and a battery pulse charging and discharging heating mode for heating the battery.

[0099] In this embodiment, the first connection port in the battery connection circuit 10 can be connected to the battery module in the vehicle, specifically, the first connection port can be divided into a battery positive connection end and a battery negative connection end, so that the battery positive connection end can be connected to the battery positive pole and the battery negative connection end can be connected to the battery negative pole. The first switch module can also be composed of a plurality of switch devices and be arranged between the first connection port and the motor module 20. By controlling the conduction and shutdown of the switch devices in the first switch module, different loops can be formed. For example, the first switch module is composed of a main positive switch S1 and a main negative switch S2, the main positive switch S1 is connected between the battery positive connection end and the motor module 20, and the main negative switch S2 is connected between the battery negative connection end and the motor module 20. By controlling the conduction or shutdown of the main positive switch S1 and the main negative switch S2, the connection between the motor module 20 and the battery can be controlled, thereby forming different loops to correspond to different working modes. In this embodiment, the main positive switch S1 and the main negative switch S2 constituting the first switch module can be selected from relays or other switch devices, and the user can increase or decrease the number of switches in the first switch module according to the requirements.

[0100] In this embodiment, the inverter in the motor module 20 can include three half-bridges, i.e. branch pairs, each of which includes a series circuit formed by an upper controllable semiconductor switch and a lower controllable semiconductor switch, i.e. a half-bridge includes an upper bridge arm switch tube and a lower bridge arm switch tube. The upper controllable semiconductor switch and the lower controllable semiconductor switch can also be respectively connected in parallel with a diode. The common end of the upper switch tubes of the three half-bridges is the positive bus end of the inverter, and the common end of the lower switch tubes of the three half-bridges is the negative bus end of the inverter. The specific structure of the inverter in this embodiment can be used as a reference, and is not limited herein. The motor winding can be a three-phase winding corresponding to the three half-bridges of the inverter. The first ends of the three-phase winding are connected to each other, and the second ends of the three-phase winding can be connected to the neutral points of the three bridge arms of the inverter one by one. By controlling the conduction and shutdown of the switches in the inverter, different loops can be formed with the three-phase winding to correspond to different working modes.

[0101] In this embodiment, the charging and power supply module 30 can be connected to an external device through the second connection port, which can be divided into a positive terminal and a negative terminal, thereby corresponding to the positive and negative terminals of the external device. The charging and power supply module 30 can also include a plurality of switching devices, such as a switch between the positive terminal and the external device, a switch between the positive terminal and the negative terminal of the battery or the second end of the main negative switch S2, and a switch between the negative terminal of the charging and power supply module 30 and the motor module 20. By controlling the conduction and shutdown of the switch, in combination with the on or off of the switch in the above description, the energy conversion device can form different loops to correspond to different working modes. It should be noted that by connecting the positive terminal of the charging and power supply module 30 to the positive terminal of the battery or to the second end of the main positive switch S1, and connecting the negative terminal of the charging and power supply module 30 to the negative terminal of the battery or to the second end of the main negative switch S2, different charging and discharging circuits can be formed. For example, connecting the positive terminal of the charging and power supply module 30 to the positive terminal of the battery and the negative terminal of the charging and power supply module 30 to the negative terminal of the battery forms a parallel charging and discharging circuit. Connecting the positive terminal of the charging and power supply module 30 to the second end of the main positive switch S1 and the negative terminal of the charging and power supply module 30 to the second end of the main negative switch S2 forms a series charging and discharging circuit. Connecting the positive terminal of the charging and power supply module 30 to the second end of the main positive switch S1 and the negative terminal of the charging and power supply module 30 to the negative terminal of the battery, or connecting the positive terminal of the charging and power supply module 30 to the positive terminal of the battery and the negative terminal of the charging and power supply module 30 to the second end of the main negative switch S2 forms a series-parallel charging and discharging circuit. Compared to the parallel charging and discharging circuit, in the series charging and discharging circuit, the positive terminal and the negative terminal of the battery connection circuit 10 are isolated from the output interface of the battery by a relay, so that the battery output interface is not continuously charged. In the series charging and discharging circuit, the main positive switch S1 and the main negative switch S2 are shared in the boost charging mode and the ordinary direct charging mode, which requires high specifications for the main positive switch S1 and the main negative switch S2, and the cost is also higher. To solve this problem, the series-parallel charging and discharging circuit is proposed in this embodiment, and the switch between the negative terminal of the charging and power supply module 30 and the negative terminal of the battery in the above description is arranged in the charging and power supply module 30 or the battery connection circuit 10, so that the negative terminal of the battery connection circuit 10 is isolated from the output interface of the battery by a relay, thereby preventing the battery output interface from being continuously charged. Therefore, both the series charging and discharging circuit and the series-parallel charging and discharging circuit can solve the problem of continuous charging of the battery output interface, and users can choose the corresponding connection scheme according to their needs.

[0102] In the embodiment, the controller is not shown in the figure, and the controller can be connected with the controlled ends of the respective switches and modules. The controller can be a digital signal processor (DSP), a programmable logic device (PLD), a microprocessor, an MCU, or other electronic components. The controller can receive a control signal of the working mode output by a management device in the vehicle or an external device, so as to enable the energy conversion device to operate in the corresponding working mode. The external device can be another vehicle or a charging pile, etc. For example, when the vehicle does not need to be charged and does not need to charge other vehicles, the controller receives a control signal of the motor driving mode, controls the battery to supply power to the motor to drive the vehicle to travel. When the charging pile or other vehicles charge the vehicle adopting the scheme, and the charging voltage is lower than the charging voltage of the vehicle adopting the scheme, the controller receives a control signal of the step-up charging mode, and the voltage output by the external device is stepped up by the motor module 20 to charge the battery of the vehicle adopting the scheme. When the vehicle adopting the scheme needs to charge other vehicles, and the charging request voltage of the other vehicles is higher than the output voltage of the vehicle adopting the scheme, the controller receives a control signal of the step-down discharging mode, and the voltage output by the battery of the vehicle adopting the scheme is stepped down by the motor module 20 and then superimposed with the battery voltage to charge the other vehicles. In addition, when the ambient temperature is low, the controller receives a control signal of the battery pulse charging and discharging heating mode, and the battery is repeatedly charged and discharged to heat.

[0103] The energy conversion device composed of the battery connection circuit 10, the motor module 20, the charging and power supply module 30, and the controller can convert the output voltage of the charging device or the output voltage of the vehicle, so as to convert the low voltage output by the charging device into high voltage to charge the battery in the vehicle, or convert the low voltage output by the battery in the vehicle into high voltage to charge the battery in other vehicles. In this way, charging compatibility can be realized for vehicles with different charging voltage protocols, and one energy conversion device can have multiple working modes and be suitable for the case that the voltage of the vehicle does not match the voltage of the external device. By changing the connection relationship between the second connection port of the charging and power supply module 30 and the first connection port of the battery connection circuit 10 and the first switch module, energy conversion devices with different structures can be formed and be suitable for different scenes.

[0104] Reference Figures 1 to 6 In an embodiment, the controller is configured to control the charging and power supply module 30 to stop working when the control signal of the motor driving mode is received, so as to output the voltage output by the battery to the motor winding through the battery connection circuit 10.

[0105] In the embodiment, when the controller receives the control signal of the motor driving mode, the controller can control the charging and power distribution module 30 to stop working, such as controlling the fast charging positive switch S4 and the fast charging negative switch S5 in the charging and power distribution module 30 to be disconnected, so that the electrical connection between the energy conversion device and the external device is also disconnected, and the voltage output by the external device cannot be received, and the voltage cannot be output to the external device, and only the voltage output by the battery can be output to the motor winding to drive the vehicle. In the case where energy transmission with the external device is not needed, the motor driving mode can be entered; in the 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 supplies power to the motor winding, so that it can be applied to the case where energy transmission with the external device is not needed.

[0106] In an embodiment, the controller is configured to, when receiving the control signal of the motor boosting charging mode, control the charging and power distribution module 30 to access the power supply of the 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 superimpose the first energy storage energy of the motor winding and the power supply voltage of the external device and output the superimposed voltage to the battery through the battery connection circuit 10 for charging.

[0107] In the embodiment, when the battery of the vehicle needs to be charged by the external device, and the output voltage of the external device is less than the charging voltage of the battery, the output voltage of the external device needs to be boosted before charging the battery. Therefore, the management device can first determine the voltage relationship between the two, and when the requested charging voltage of the battery in the vehicle is greater than the output voltage of the external device, it can be determined that the boosting charging mode is entered; for example, when the requested charging voltage of the battery is 700V, and the output voltage of the charging pile or the output voltage of the external device is 500V, the boosting charging mode needs to be entered. At this time, the management device can output the control signal of the boosting charging mode to the controller; the controller can control the charging and power distribution module 30, the inverter and the motor winding to boost the power supply voltage of the external device, superimpose the boosted voltage and the power supply voltage of the external device, and output the higher voltage to the battery through the battery connection circuit 10 for charging. In this way, it can be applied to the case where the external device with low output voltage is needed to supplement the energy, so as to avoid the problem 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, and also prevents the problems of reduced charging efficiency and increased charging cost of the user.

[0108] In an exemplary technique, in the motor boost charging mode, the first switch module includes a main positive switch S1 and a main negative switch S2, the charging and power supply module 30 includes a fast charging positive switch S4 and a fast charging negative switch S5, the fast charging positive switch S4 is connected between the first end of the first connection port and an external device, the fast charging negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch S1 is connected between the first end of the first connection port and the first common terminal of the inverter, the main negative switch S2 is connected between the second end of the first connection port and the second common terminal of the inverter, and the second connection port is connected to the second end of any one of the three-phase windings. In combination Figures 1 to 6 The motor boost charging mode is described.

[0109] Referring to Figures 1 to 6 In an embodiment, the motor boost charging mode includes:

[0110] In a first energy storage stage, the controller controls the fast charging positive switch S4 and the main positive switch S1 to be turned on, controls the main negative switch S2 and the fast charging negative switch S5 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. The first upper bridge arm switch is any one or both of the two upper bridge arm switches corresponding to the two-phase winding pair not connected to the second connection port of the charging and power supply module 30; and / or,

[0111] In a boost charging stage, the controller controls the fast charging positive switch S4 and the main negative switch S2 to be turned on, controls the main positive switch S1 and the fast charging negative switch S5 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, or controls all the bridge arm switches of the inverter to be turned off. The first lower bridge arm switch is connected to the same phase winding as the first upper bridge arm switch.

[0112] In this embodiment, when the controller controls the corresponding switches to be turned on or turned off 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 be turned on or turned off 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 output to the battery for charging.

[0113] It should be noted that in the embodiment, the control of the first upper bridge arm switch and the first lower bridge arm switch to be turned on can be to control the bridge arm switch to be turned on and turned off with a preset duty ratio. As can be known from the calculation formula of the inductance voltage, in the case that the inductance and the current in the circuit are unchanged, the voltage value of the inductance can be changed by changing the on time of the bridge arm switch. The specific duty ratio can be set according to user demand, for example, in the first energy storage stage, the voltage value of the inductance can be controlled to be less than the voltage of the first battery pack by controlling the duty ratio of the bridge arm switch, so that the first battery pack charges the motor winding. The subsequent control process is the same, the voltage value of the inductance is changed by controlling the duty ratio, so that the battery pack charges the inductance or the inductance discharges the battery pack.

[0114] And when the bridge arm switch of the inverter is controlled to be turned off, the current in the circuit will flow through the diode parallel to the switch tube of the same phase as the switch tube turned on in the last stage. For example, in the first energy storage stage, the controller controls the first upper bridge arm switch of the inverter to be turned on, and in the first energy releasing stage, the controller controls the bridge arm switch of the inverter to be turned off. At this time, the current will flow through the diode parallel to the first lower bridge arm switch to form a loop; of course, the first lower bridge arm switch can also be controlled to be turned on to form a loop, so that the energy releasing speed of the motor winding is faster. In the subsequent process of controlling the bridge arm switch of the inverter to be turned off in the specification, the principle is the same as that in the embodiment.

[0115] Further, the first energy storage stage and the voltage boosting charging stage in the motor voltage boosting charging mode in the embodiment can be combined to achieve the effect of voltage boosting charging. For example, first enter the first energy storage stage and then enter the voltage boosting charging stage, so that the voltage output by the external device can be first transmitted to the motor winding for energy storage, and when the first energy storage energy reaches a first preset energy value, the first energy storage energy in the motor winding and the voltage of the external device are superimposed and output to the battery for charging. In this way, in the case that the voltage output by the external device is less than the charging voltage of the battery, the voltage output by the external device can be boosted through the combination of the two stages in the motor voltage boosting charging mode, and the normal charging of the battery can be completed. It can be understood that the first preset energy value can be a 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 output voltage of the external device is 500V, the voltage value that needs to be boosted is 200V, and at this time, the energy stored in the motor winding needs to be at least 200V for charging the external device. Specifically, the energy storage and charging speed of the winding can be tested in advance, and the motor winding is discharged when the energy storage time of the winding reaches a preset time, and the motor winding is charged when the discharging time of the winding reaches a preset time. In this way, the motor voltage boosting charging mode of the energy conversion device in the embodiment can realize the charging of the battery with high charging voltage in the vehicle by the external device with low output voltage. The control principle of the motor voltage boosting charging mode can be referred to the description of the embodiment, and the user can adjust the circuit structure and charging time according to actual needs, which is not limited herein.

[0116] The user can also combine or extend the multiple stages of the motor voltage boosting charging mode according to actual needs. The specific principle can be referred to the above description, which is not limited herein.

[0117] It should be noted that in another embodiment, in the motor voltage boosting charging mode, the first switch module includes a main positive switch S1 and a main negative switch S2, the charging and power distribution module 30 includes a fast charging positive switch S4 and a fast charging negative switch S5, the fast charging positive switch S4 is connected between the first end of the first connection port and the external device, the fast charging negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch S1 is connected between the first end of the first connection port and the first bus end of the inverter, the main negative switch S2 is connected between the second end of the first connection port and the second bus end of the inverter, and the second connection port is connected with the first end of the three-phase winding. Figures 1 to 6 The motor voltage boosting charging mode is described.

[0118] Referring to Figures 1 to 6 , the motor voltage boosting charging mode includes:

[0119] In the first energy storage stage, the controller controls the fast charging positive switch S4 and the main positive switch S1 to be turned on, controls the main negative switch S2 and the fast charging negative switch S5 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,

[0120] In the boost charging stage, the controller controls the fast charging positive switch S4 and the main negative switch S2 to be turned on, controls the main positive switch S1 and the fast charging negative switch S5 to be turned off, and controls the lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter turned on in the first energy storage stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0121] In the first energy storage stage, the controller controls the corresponding switches to be turned on or turned off, and 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. In the boost charging stage, the controller controls the corresponding switches to be turned on or turned off, and the first energy storage energy in the motor winding and the voltage output by the external device can be superimposed and output to the battery for charging.

[0122] It can be understood that, in the case that the second connection port of the charging and power distribution module 30 is connected to the first end of the three-phase winding, the controller controls the upper bridge arm switch and the lower bridge arm switch of the inverter to be turned on, which is different from the case that the second connection port 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 the case that the second connection port of the charging and power distribution module 30 is connected to the first end of the three-phase winding, the controller can prevent the charging process from shaking. In addition, the control of the bridge arm switch can be more flexible. For example, in the case that the second connection port 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 be turned on, while in the present embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be turned on. In this way, the voltage of the three-phase winding as a whole can be changed, so that the energy storage and energy release speed of the three-phase winding can be changed. For example, the more the bridge arm switches are turned on, the higher the voltage of the three-phase winding as a whole, and the faster the energy storage and energy release speed of the three-phase winding. The number of turned-on bridge arm switches can be determined according to the actual voltage demand of the user. The motor boost charging can be realized in both connection modes.

[0123] In an embodiment, the controller is configured to, when receiving the control signal of the motor voltage reduction discharging 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 second energy storage energy of the motor winding to an external device for charging.

[0124] In this embodiment, when the vehicle's battery needs to discharge to an external device, and the external device's requested charging voltage is greater than the battery's output voltage, the battery's output voltage needs to be boosted before charging the battery. Therefore, the voltage can be first determined by the management device. When the vehicle's battery voltage is greater than the external device's charging voltage, it is determined to enter the step-down discharge mode. For example, when the battery's output voltage is 700V and the external device's requested charging voltage is 500V, it is necessary to enter the 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 output the stored energy of the motor winding to the external device for charging by controlling the charging and distribution module 30, the inverter, and the motor winding. This can be applied to situations where the vehicle's output voltage is higher than the external device's requested charging voltage, avoiding the situation where the vehicle's output voltage is high, causing damage to the battery of the external device and affecting the user experience.

[0125] In an exemplary technology, in the motor step-down discharge mode, the first switch module includes a main positive switch S1 and a main negative switch S2, and the charging and distribution module 30 includes a fast charging positive switch S4 and a fast charging negative switch S5. The fast charging positive switch S4 is connected between the first end of the first connection port and the external device, and the fast charging negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port. The main positive switch S1 is connected between the first end of the first connection port and the first bus terminal of the inverter, and the main negative switch S2 is connected between the second end of the first connection port and the second bus terminal of the inverter. The second connection port is connected to the second end of any phase in the three-phase winding. Combined Figures 1 to 6 The motor voltage reduction discharge mode is described.

[0126] Reference Figures 1 to 6 In one embodiment, the motor voltage reduction discharge mode includes:

[0127] In the second energy storage stage, the controller controls the fast-charging positive switch S4 and the main negative switch S2 to be turned on, controls the main positive switch S1 and the fast-charging negative switch S5 to be turned off respectively, 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;

[0128] The first lower bridge arm switch is any one or two of the two upper bridge arm switches corresponding to the two-phase windings that are not connected to the second connection port of the charging and distribution module 30; and / or,

[0129] In the voltage reduction discharging phase, the controller controls the fast charging positive switch S4 and the main positive switch S1 to be turned on, controls the fast charging negative switch S5 and the main negative switch S2 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 the bridge arm switches of the inverter to be turned off, the first upper bridge arm switch and the first lower bridge arm switch being connected to the same phase winding.

[0130] In the second energy storage phase, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the battery can be transmitted to the motor winding for energy storage. In the voltage reduction discharging phase, the controller controls the corresponding switches to be turned on or turned off, and the second energy storage energy in the motor winding and the voltage output by the battery can be superimposed and then output to the external device for charging.

[0131] It should be noted that, in the embodiment, the first upper bridge arm switch and the first lower bridge arm switch can be controlled to be turned on with a preset duty ratio, and the duty ratio can be set according to the charging and discharging relationship in different phases of the motor voltage reduction discharging mode and by referring to the description of the inductor voltage in the above embodiment.

[0132] Further, in the embodiment, the second energy storage phase and the voltage reduction discharging phase in the motor voltage reduction discharging mode can be combined into two phases to achieve the effect of voltage reduction discharging. For example, the second energy storage phase is entered first and then the voltage reduction discharging phase is entered, so that the voltage output by the battery can be first transmitted to the motor winding for energy storage, and when the second energy storage energy reaches a second preset energy value, the voltage reduction discharging phase is switched to, and the second energy storage energy in the motor winding is output to the external device for charging. In this way, when the voltage output by the battery is greater than the charging voltage of the external device, the output voltage of the battery can be reduced by the combination of the two phases in the motor voltage reduction discharging mode, and normal charging of the external device can be completed. It can be understood that the second preset energy value can be the voltage value required for charging the external device. For example, when the output voltage of the battery is 700V and the requested charging voltage of the external device is 500V, the energy stored in the motor winding needs to be at least 500V for charging the external device, and the 700V output by the battery is reduced to 500V and then output to the external device for charging. Specifically, the energy storage charging speed of the winding can be tested in advance, and the motor winding is discharged when the energy storage time of the winding reaches a preset time, and the motor winding is charged when the discharging time of the winding reaches a preset time. The specific control principle of the motor voltage reduction discharging mode can be referred to the description of the embodiment, and the circuit structure and charging time can be adjusted according to actual needs, which is not limited herein. In this way, the embodiment can realize charging of the external device with high charging voltage by the battery with low output voltage.

[0133] The user can also combine or extend the multiple stages of the motor step-down discharging mode according to actual needs. The specific principle can be referred to the above description, which is not limited here.

[0134] It should be noted that in another embodiment, in the motor step-down discharging mode, the first switch module includes a main positive switch S1 and a main negative switch S2, the charging and power supply module 30 includes a fast charging positive switch S4 and a fast charging negative switch S5, the fast charging positive switch S4 is connected between the first end of the first connection port and an external device, the fast charging negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch S1 is connected between the first end of the first connection port and the first bus end of the inverter, the main negative switch S2 is connected between the second end of the first connection port and the second bus end of the inverter, and the second connection port is connected with the first end of the three-phase winding. In combination Figures 1 to 6 The motor step-down discharging mode is described.

[0135] Referring to Figures 1 to 6 In an embodiment, the motor step-down discharging mode includes:

[0136] In a second energy storage stage, the controller controls the fast charging positive switch S4 and the main negative switch S2 to be turned on, controls the main positive switch S1 and the fast charging negative switch S5 to be turned off respectively, 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,

[0137] In a step-down discharging stage, the controller controls the fast charging positive switch S4 and the main positive switch S1 to be turned on, controls the fast charging negative switch S5 and the main negative switch S2 to be turned off, and controls the upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter turned on in the second energy storage stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0138] In the second energy storage stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the battery can be transmitted to the motor winding for energy storage. In the step-down discharging stage, the controller controls the corresponding switches to be turned on or turned off, and the second energy storage energy in the motor winding and the voltage output by the battery can be superimposed and output to the external device for charging.

[0139] It can be understood that in the case that the second connection port of the charging and power distribution module 30 is connected with the first end of the three-phase winding, the controller controls the upper bridge arm switch and the lower bridge arm switch of the inverter to be turned on, which is different from the case that the second connection port of the charging and power distribution module 30 is connected with the second end of any one of the three-phase winding. For example, in the case that the second connection port of the charging and power distribution module 30 is connected with the first end of the three-phase winding, the embodiment can prevent the occurrence of jitter during the charging process. It can also make the control of the bridge arm switch more flexible. For example, when the second connection port of the charging and power distribution module 30 is connected with the second end of any one of the three-phase winding, at most two upper bridge arm switches or lower bridge arm switches are controlled to be turned on, while in the embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be turned on. In this way, the voltage of the three-phase winding as a whole can be changed, so that the energy storage and energy release speed of the three-phase winding can be changed. For example, the more bridge arm switches are turned on, the higher the voltage of the three-phase winding as a whole, and the faster the energy storage and energy release speed of the three-phase winding. The number of bridge arm switches to be turned on can be determined according to the actual voltage demand of the user. The motor can be discharged in both connection modes.

[0140] It should be noted that the temperature of the battery in the vehicle is low, which will reduce the charging and discharging efficiency of the battery, thereby affecting the working state of the vehicle. Therefore, the battery needs to be heated when the vehicle is started or charged and discharged to ensure the charging and discharging efficiency of the battery. Specifically, the battery temperature can be detected, and when the detected value is lower than the preset value, the management device outputs a control signal of the battery pulse charging and discharging heating mode to the controller. The specific preset temperature can be set according to the type of battery and user demand. The controller is used to control the motor module and the charging and power distribution module 30 when receiving the control signal of the battery pulse charging and discharging heating mode to heat the battery. Specifically, the controller can control the battery to charge the motor winding, and then control the motor winding to charge the battery. The above process is repeated, and the battery is repeatedly charged and discharged. In this way, the battery can be heated by pulses.

[0141] In an exemplary technique, the battery pulse charge-discharge heating mode includes a first battery pulse charge-discharge heating mode, the first switch module includes a main positive switch S1 and a main negative switch S2, the charge-discharge module 30 includes a fast charge positive switch S4 and a fast charge negative switch S5, the fast charge positive switch S4 is connected between the first end of the first connection port and an external device, the fast charge negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch S1 is connected between the first end of the first connection port and the first bus end of the inverter, the main negative switch S2 is connected between the second end of the first connection port and the second bus end of the inverter, the motor module includes a first capacitor, the first capacitor is connected in parallel between the first bus end and the second bus end of the inverter, and the second connection port is connected with the second end of any one phase of the three-phase winding. In combination Figures 1 to 6 The first battery pulse charge-discharge heating mode is described.

[0142] Referring to Figures 1 to 6 In an embodiment, the first battery pulse charge-discharge heating mode includes:

[0143] In a third energy storage stage, the controller controls the main positive switch S1 and the fast charge negative switch S5 to be turned on, controls the main negative switch S2 and the fast charge positive switch S4 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;

[0144] The first upper bridge arm switch is any one or both of the two upper bridge arm switches corresponding to the two-phase winding pair not connected with the second connection port of the charge-discharge module 30; and / or,

[0145] In a fourth energy storage stage, the controller controls the main positive switch S1 and the fast charge negative switch S5 to be turned on, controls the main negative switch S2 and the fast charge positive switch S4 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, or controls all the bridge arm switches of the inverter to be turned off;

[0146] The first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and / or,

[0147] In a first energy release stage, the controller controls the main positive switch S1 and the fast charge negative switch S5 to be turned on, controls the main negative switch S2 and the fast charge positive switch S4 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;

[0148] The first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and / or,

[0149] In the second energy releasing stage, the controller controls the main positive switch S1 and the fast charging negative switch S5 to be turned on, controls the main negative switch S2 and the fast charging positive switch S4 to be turned off, and controls the upper bridge arm switch of the inverter in the third energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0150] In the third energy storing stage, when the controller controls the corresponding switches to be turned on or turned off, the voltage output by the battery can be transmitted to the motor winding for energy storage. In the fourth energy storing stage, when the controller controls the corresponding switches to be turned on or turned off, the power voltage output by the battery can be transmitted to the first capacitor C1 for energy storage. In the first energy releasing stage, when the controller controls the corresponding switches to be turned on or turned off, the voltage output by the first capacitor C1 can be transmitted to the battery for charging. In the second energy releasing stage, when the controller controls the corresponding switches to be turned on or turned off, the voltage output by the motor winding can be transmitted to the battery for charging.

[0151] It should be noted that, in the embodiment, the first upper bridge arm switch and the first lower bridge arm switch can be controlled to be turned on with a preset duty ratio. The specific duty ratio can be set according to the charging and discharging relationship in different stages of the direct charging mode and by referring to the description of the inductor voltage in the above embodiment.

[0152] Further, in the embodiment, the third energy storage stage, the fourth energy storage stage, the first energy release stage and the second energy release stage in the first battery pulse charging and discharging heating mode can be combined to achieve different effects, such as sequentially executing the third energy storage stage, the fourth energy storage stage, the first energy release stage and the second energy release stage. In the third energy storage stage, the power supply voltage output by the battery is transmitted to the motor winding for energy storage, and when the third preset energy value is reached, the third energy storage stage is switched to the fourth energy storage stage. The third 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 of the battery output, and then the first energy release stage is switched. 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 fourth preset energy value, and then the second energy release stage is switched. Then the voltage output by the motor winding is transmitted to the battery until the fourth energy storage energy of the motor winding is lower than the fifth preset energy value, and then the third energy storage stage is switched. 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 of the first capacitor C1, which is the first battery pulse charging and discharging heating mode. In this embodiment, the charging speed of the winding can be tested in advance, and when the preset time is reached, the winding is discharged, and when the preset time is reached, the winding is charged. It should be noted that in this embodiment, the third preset energy value to the fifth preset energy value can be set according to the energy value required for pulse heating of the battery in actual application. If the energy is too small, it may lead to low heating efficiency; if the energy is too large, it may lead to rapid temperature rise and damage to the battery. The specific energy value can be obtained according to the heat capacity (C) of the battery and the temperature (ΔT) to be raised. For example, the following formula is used to calculate the required heating energy (Q): Q = C * ΔT. Therefore, the third preset energy value can be the heating energy required by the battery, the fourth 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 fifth preset energy value can be 0, which means that the energy in the motor winding is transmitted to the battery at this time. The fourth preset energy value and the fifth preset energy value can also be other values, which are not limited here, but need to be lower than the third preset energy value, and the difference between the third preset energy value and the fourth preset energy value and the fifth preset energy value can meet the energy condition for heating the battery. In this embodiment, the first capacitor C1 is also repeatedly charged and discharged in the process of repeatedly charging and discharging the battery, thereby generating ripple to heat the battery. It can be applied to the case where the environmental temperature is low. In this way, the battery can operate within the optimal temperature range, has a longer service life, and can improve the charging and discharging efficiency of the battery. Heating the battery can help keep it within the optimal temperature range, thereby improving its range.As well as improving vehicle safety, battery overheating or overcooling may cause the battery to catch fire or explode. Heating the battery can help keep it within the optimal temperature range, thereby improving vehicle safety.

[0153] Users can also combine or expand multiple stages in the first battery pulse charge and discharge heating mode according to actual needs. Other combinations of multiple stages and specific working principles, as well as the control of the bridge arm switch duty cycle and the setting of preset energy values ​​in multiple stages can refer to the description of the above embodiments and will not be repeated here.

[0154] It should be noted that, in another embodiment, in the first battery pulse charge and discharge heating mode, the first switch module includes a main positive switch S1 and a main negative switch S2, the charging and distribution module 30 includes a fast charge positive switch S4 and a fast charge negative switch S5, the fast charge positive switch S4 is connected between the first end of the first connection port and the external device, the fast charge negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch S1 is connected between the first end of the first connection port and the first bus terminal of the inverter, the main negative switch S2 is connected between the second end of the first connection port and the second bus terminal of the inverter, the motor module includes a first capacitor, the first capacitor is connected in parallel between the first bus terminal and the second bus terminal of the inverter, and the second connection port is connected to the first end of the three-phase winding. Combined Figures 1 to 6 The first battery pulse charge-discharge heating mode will be described.

[0155] Reference Figures 1 to 6 In one embodiment, the first battery pulse charge-discharge heating mode includes:

[0156] In the third energy storage stage, the controller controls the main positive switch S1 and the fast charge negative switch S5 to be turned on, controls the main negative switch S2 and the fast charge positive switch S4 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,

[0157] In the fourth energy storage stage, the controller controls the main positive switch S1 and the fast charging negative switch S5 to be turned on, controls the main negative switch S2 and the fast charging positive switch S4 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; and / or,

[0158] In the first energy releasing stage, the controller controls the main positive switch S1 and the fast charging negative switch S5 to be turned on, controls the main negative switch S2 and the fast charging positive switch S4 to be turned off, controls the lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter turned on in the third energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, and / or,

[0159] In the second energy releasing stage, the controller controls the main positive switch S1 and the fast charging negative switch S5 to be turned on, controls the main negative switch S2 and the fast charging positive switch S4 to be turned off, controls the upper bridge arm switch of the inverter turned on in the third energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0160] In the third energy storing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the battery can be transmitted to the motor winding for energy storage. In the fourth energy storing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the battery can be transmitted to the first capacitor C1 for energy storage. In the first energy releasing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the first capacitor C1 can be transmitted to the battery for charging. In the second energy releasing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the motor winding can be transmitted to the battery for charging.

[0161] It can be understood that, in the case that the second connection port of the charging and power distribution module 30 is connected with the first end of the three-phase winding, the controller controls the upper bridge arm switch and the lower bridge arm switch of the inverter to be turned on, which is different from the case that the second connection port of the charging and power distribution module 30 is connected with the second end of any one of the three-phase winding, for example, in the case that the second connection port of the charging and power distribution module 30 is connected with the first end of the three-phase winding, the controller can prevent the jitter in the charging process. In addition, the control of the bridge arm switch can be more flexible, for example, in the case that the second connection port of the charging and power distribution module 30 is connected with the second end of any one of the three-phase winding, at most two upper bridge arm switches or lower bridge arm switches can be controlled to be turned on, while in the embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be turned on, so that the voltage of the three-phase winding as a whole can be changed, thereby changing the energy storing and releasing speed of the three-phase winding. For example, the more the bridge arm switches are turned on, the higher the voltage of the three-phase winding as a whole, and the faster the energy storing and releasing speed of the three-phase winding. The number of the bridge arm switches to be turned on can be determined according to the actual voltage demand of the user. In both connection modes, the battery pulse charging and discharging heating can be achieved. The other combination modes and specific working principles in the plurality of stages, the control of the duty cycle of the bridge arm switch, and the setting of the preset energy value in the plurality of stages can refer to the description of the above embodiments, which will not be described herein.

[0162] In another exemplary technology, the battery pulse charge-discharge heating mode includes a second battery pulse charge-discharge heating mode, the first switch module includes a main positive switch S1 and a main negative switch S2, the charge-discharge module 30 includes a fast charge positive switch S4 and a fast charge negative switch S5, the fast charge positive switch S4 is connected between the first end of the first connection port and an external device, the fast charge negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch S1 is connected between the first end of the first connection port and the first common terminal of the inverter, the main negative switch S2 is connected between the second end of the first connection port and the second common terminal of the inverter, the second connection port includes a positive terminal and a negative terminal, the charge-discharge module 30 includes a second capacitor C2, the first end of the second capacitor C2 is connected with the first end of the first connection port or the fast charge positive switch S4, the second end of the second capacitor C2 is connected with the fast charge negative switch S5, and the second connection port is connected with the second end of any one phase of the three-phase winding. In combination Figures 1 to 6 The second battery pulse charge-discharge heating mode is described.

[0163] Referring to Figures 1 to 6 In an embodiment, the second battery pulse charge-discharge heating mode includes:

[0164] In a fifth energy storage stage, the controller controls the main negative switch S2 to be turned on, controls the main positive switch S1, the fast charge positive switch S4 and the fast charge negative switch S5 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;

[0165] The first lower bridge arm switch is any one or both of the two lower bridge arm switches corresponding to the two-phase winding pair not connected with the second connection port of the charge-discharge module 30; and / or,

[0166] In a sixth energy storage stage, the controller controls the main positive switch S1 to be turned on, controls the main negative switch S2, the fast charge positive switch S4 and the fast charge negative switch S5 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 or controls all the bridge arm switches of the inverter to be turned off;

[0167] The first upper bridge arm switch and the first lower bridge arm switch are connected to the same phase winding; and / or,

[0168] In a third energy release stage, the controller controls the main positive switch S1 to be turned on, controls the main negative switch S2, the fast charge positive switch S4 and the fast charge negative switch S5 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;

[0169] The first upper bridge arm switch and the first lower bridge arm switch are connected to the same phase winding; and / or,

[0170] In the fourth energy discharge stage, the controller controls the main negative switch S2 to be turned on, controls the main positive switch S1, the fast charging positive switch S4 and the fast charging negative switch S5 to be turned off, and controls the lower 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.

[0171] In this embodiment, when the controller controls the corresponding switch to be turned on or off 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 be turned on or off 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 be turned on or off 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 be turned on or off 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. In addition, in this embodiment, a capacitor switch S6 can be set between the fast charge positive switch and the fast charge negative switch, and the second capacitor C2 can be set between the capacitor switch S6 and the fast charge negative switch S5; in the second battery pulse charge, discharge and heating mode, the capacitor switch S6 can be controlled to remain in the on state to form a circuit loop, so that the energy conversion device can work normally in the second battery pulse charge, discharge and heating mode to charge, discharge and heat the battery. If the current in other modes does not need to pass through the branch of the capacitor switch S6, the capacitor switch S6 can be controlled to be disconnected. The first end of the second capacitor C2 can be connected to the first end of the first connection port or the fast charging positive switch S4 through the capacitor switch S6. It should be noted that when the first end of the second capacitor C2 is connected to the fast charging positive switch S4, it can be connected to the first end or the second end of the fast charging positive switch S4. When the fast charging positive switch S4 is set in the charging and distribution module 30, the first end of the second capacitor C2 is connected to the first end of the fast charging positive switch S4 through the capacitor switch S6; in another exemplary technology, the fast charging positive switch S4 can also be set in the battery connection circuit 10. In this case, the first end of the second capacitor C2 is connected to the second end of the fast charging positive switch S4 through the capacitor switch S6.

[0172] It should be noted that, in this embodiment, the first upper bridge arm switch and the first lower bridge arm switch are controlled to be turned on and off by controlling a preset duty cycle. The specific duty cycle can be set according to the charge and discharge relationship in different stages of the direct charging mode in this embodiment, and with reference to the description of the voltage on the inductor in the above embodiment.

[0173] Further, in the embodiment, the fifth energy storage stage, the sixth energy storage stage, the third energy release stage and the fourth energy release stage in the first battery pulse charging and discharging heating mode can be combined to achieve different effects, such as sequentially executing the fifth energy storage stage, the sixth energy storage stage, the third energy release stage and the fourth energy release stage; 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 fifth energy storage stage, and when the fifth energy storage energy reaches the sixth preset energy value, the process is switched to the sixth energy storage stage; 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 the process is 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 the process is 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 seventh preset energy value, and the process is switched to the fifth energy storage stage; in the embodiment, the second capacitor C2 of the charging and power distribution module 30 can be used for energy storage and energy release, and the charging and discharging of the second capacitor C2 can generate a ripple to heat the battery, and thus the second battery pulse charging and discharging heating mode is realized. When the controller receives the control signal of the second battery pulse charging and discharging heating mode, the charging and power distribution module 30, the inverter, the battery and the motor winding repeatedly charge and discharge the second capacitor C2 according to the above control actions. In this way, an alternating excitation of a certain frequency and amplitude can be applied to the positive and negative electrodes of the second capacitor C2 to generate a ripple and heat the battery. Specifically, the energy storage charging speed of the winding can be tested in advance, the winding is discharged after the energy storage charging time of the winding reaches the preset time, and the winding is charged after the energy release time of the winding reaches the preset time. The sixth preset energy value can be the voltage value required for heating the battery; the seventh preset energy value can be the voltage value when the motor winding energy is released completely or to a certain extent, and the specific principle can refer to the description in the first battery pulse charging and discharging heating mode in the above embodiment. The sixth preset energy value and the seventh preset energy value can be set according to user requirements. Repeating the above process repeatedly charges and discharges the second capacitor C2, which can also generate a ripple to heat the battery. In actual application, the user can set the energy conversion device to preferentially enter the first battery pulse charging and discharging heating mode or the second battery pulse charging and discharging heating mode according to requirements. In this way, the battery pulse charging and discharging heating mode can heat the battery of the vehicle in a low-temperature environment, so as to ensure that the vehicle can work normally and avoid damage to the battery.

[0174] The user can also combine or extend the multiple stages in the second battery pulse charge-discharge heating mode according to actual needs. Other combination manners of the multiple stages, specific working principles, control of the bridge arm switch duty cycle, and setting of the preset energy values of the multiple stages can refer to the descriptions of the above embodiments, and will not be described here again.

[0175] It should be noted that in another embodiment, in the second battery pulse charge-discharge heating mode, the first switch module includes a main positive switch S1 and a main negative switch S2, the charge-discharge module 30 includes a fast charge positive switch S4 and a fast charge negative switch S5, the fast charge positive switch S4 is connected between the first end of the first connection port and an external device, the fast charge negative switch S5 is connected between the second end of the second connection port and the second end of the first connection port, the main positive switch S1 is connected between the first end of the first connection port and the first bus end of the inverter, the main negative switch S2 is connected between the second end of the first connection port and the second bus end of the inverter, the second connection port includes a positive end and a negative end, the charge-discharge module 30 includes a second capacitor C2, a first end of the second capacitor C2 is connected with the first end of the first connection port or the fast charge positive switch S4, a second end of the second capacitor C2 is connected with the fast charge negative switch S5, and the second connection port is connected with a first end of a three-phase winding.

[0176] The second battery pulse charge-discharge heating mode includes:

[0177] In the fifth energy storage stage, the controller controls the main negative switch S2 to be turned on, controls the main positive switch S1, the fast charge positive switch S4, and the fast charge negative switch S5 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,

[0178] In the sixth energy storage stage, the controller controls the main positive switch S1 to be turned on, controls the main negative switch S2, the fast charge positive switch S4, and the fast charge negative switch S5 to be turned off, and controls an upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter 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 the bridge arm switches of the inverter to be turned off; and / or,

[0179] In the third energy storage stage, the controller controls the main positive switch S1 to be turned on, controls the main negative switch S2, the fast charge positive switch S4, and the fast charge negative switch S5 to be turned off, and controls an upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter 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; and / or,

[0180] In the fourth energy releasing stage, the controller controls the main negative switch S2 to be turned on, controls the main positive switch S1, the fast charging positive switch S4 and the fast charging negative switch S5 to be turned off, and controls the lower bridge arm switch of the inverter in the fifth energy storing stage to be turned on, controls the remaining bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

[0181] In the fifth energy storing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the battery can be transmitted to the second capacitor C2 and the motor winding for energy storage. In the sixth energy storing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the second capacitor C2 can be transmitted to the motor winding for energy storage. In the third energy releasing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the motor winding can be transmitted to the second capacitor C2 for charging. In the fourth energy releasing stage, the controller controls the corresponding switches to be turned on or turned off, and the voltage output by the second capacitor C2 and the motor winding can be transmitted to the battery for charging. In this embodiment, the capacitor switch S6 can also be provided, and the specific principle is referred to the above description.

[0182] It can be understood that, in the case that the second connection port of the charging and power distribution module 30 is connected with the first end of the three-phase winding, the controller controls the upper bridge arm switch and the lower bridge arm switch of the inverter to be turned on, which is different from the case that the second connection port of the charging and power distribution module 30 is connected with the second end of any one of the three-phase winding. For example, in the case that the second connection port of the charging and power distribution module 30 is connected with the first end of the three-phase winding, the embodiment can prevent the jitter in the charging process. In addition, the control of the bridge arm switch can be more flexible. For example, in the case that the second connection port of the charging and power distribution module 30 is connected with the second end of any one of the three-phase winding, at most two upper bridge arm switches or lower bridge arm switches can be controlled to be turned on, while in this embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be turned on. In this way, the voltage of the three-phase winding as a whole can be changed, so that the energy storing and releasing speed of the three-phase winding can be changed. For example, the more the bridge arm switches are turned on, the higher the voltage of the three-phase winding as a whole, and the faster the energy storing and releasing speed of the three-phase winding. The number of the bridge arm switches to be turned on can be determined according to the actual voltage demand of the user. In both connection modes, the battery pulse charging and discharging heating can be realized. In addition, the other combination modes and the specific working principles of the plurality of stages, and the control of the bridge arm switch duty ratio and the setting of the preset energy value of the plurality of stages can be referred to the description of the above embodiments, which will not be described herein.

[0183] It can be understood that, in order to protect the electrical components in the energy conversion device from being impacted, the capacitor and the inductor in the energy conversion device need to be pre-charged and discharged.

[0184] Referring to Figures 1 to 6 In an embodiment, the charging and power distribution module 30 further comprises:

[0185] a bleeder circuit 50 connected in parallel to the first end and the second end of the second capacitor C2, the bleeder circuit 50 being configured to pre-charge the second capacitor C2 before the energy conversion device enters the boost charging mode and to bleed the second capacitor C2 after the energy conversion device exits the boost charging mode.

[0186] In the embodiment, the bleeder circuit 50 can be composed of resistors, switches, diodes, capacitors and the like. The bleeder circuit 50 can pre-charge the second capacitor C2 before the energy conversion device enters the boost charging mode. Specifically, the pre-charge can be completed by controlling the circuit in the energy conversion device to conduct the voltage of the battery to the second capacitor C2. After the boost charging mode of the energy conversion device ends, the second capacitor C2 also needs to be bled, which is specifically completed by the electrical elements in the bleeder circuit 50 connected in parallel to the two ends of the second capacitor C2. It can be understood that for other capacitors or inductors in the energy conversion device, a bleeder circuit 50 can also be correspondingly provided. After the bleeder circuit 50 is provided, the second capacitor C2 and the capacitor switch S6 can exchange the series connection mode.

[0187] In an embodiment, the controller is further configured to, when receiving the control signal of the direct charging mode, control the charging and distribution module 30 to output the power of the external device to the battery through the battery connection circuit 10 for charging.

[0188] In the 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 of the two can be determined by the management device first. When the output voltage of the external device is greater than or equal to the charging request voltage of the battery in the vehicle, 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 output voltage of the external device is 550V, the direct charging mode can be entered. At this time, the controller can control the boost switch S7 to be disconnected, so as to disconnect the connection between the charging and distribution module 3030 and the motor winding, so as to output the voltage output by the external device to the battery through the battery connection circuit 10 for charging.

[0189] In an exemplary technique, the charging and distribution module 30 includes a boost switch S7, a fast charging positive switch S4 and a fast charging negative switch S5, the fast charging positive switch S4 being connected between the first end of the first connection port and the external device, the fast charging negative switch S5 being connected between the second end of the second connection port and the second end of the first connection port, and the boost switch S7 being connected between the fast charging negative switch S5 and the first end of any one of the three-phase windings or the three-phase winding. Figure 11 The direct charging mode is described.

[0190] Referring to Figures 1 to 6 In an embodiment, the direct charging mode comprises:

[0191] a direct charging phase, the controller controls the fast charging positive switch and the fast charging negative switch to be turned on, and controls the boost switch to be turned off.

[0192] The controller is configured to, when receiving a control signal of the direct charging mode, control the fast charging positive switch S4 and the fast charging negative switch S5 to be turned on respectively, and control the boost switch S7 to be turned off, so as to output the power output by the external device to the battery through the battery connection circuit 10 for charging.

[0193] Thus, the direct charging mode of the energy conversion device in this embodiment can be applied to the case where the output voltage of the external device is greater than the charging request voltage of the battery in the vehicle, and will not cause overcharging or damage of the battery in the vehicle.

[0194] Referring to Figures 1 to 6 In an embodiment, the charging and power distribution module 30 further comprises:

[0195] A first inductor L1 connected in series between the second end of one phase of the three-phase winding and the second connection port of the charging and power distribution module 30.

[0196] In this embodiment, the boost switch S7 can be connected in series with the first inductor L1, and the first inductor L1 can also function as an energy storage and release device, and can store energy together with the second capacitor C2 in the charging and power distribution module 30 to increase the energy storage capacity. Thus, the charging power in the boost charging mode and the discharging power in the buck discharging mode of the energy conversion device can be improved, and the heating power in the battery pulse charging and discharging heating mode can also be improved.

[0197] Referring to Figure 11 In an embodiment, the energy conversion device further comprises a pre-charging 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 positive electrode connection end of the battery, a first end of the shunt resistor RS is connected to the negative electrode connection end of the battery, 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-charging switch S3, a second end of the main positive switch S1 and a second end of the pre-charging 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.

[0198] In this embodiment, considering the charging safety and stability of the energy conversion device and other problems, the energy conversion device can also be provided with a pre-charge switch S3, a first resistor R1, a main fuse F1 and a shunt RS and other devices; by controlling the pre-charge switch S3 to form a pre-charge circuit, the battery is pre-charged to ensure stable charging. The first resistor R1 can limit the current. The main fuse F1 can be disconnected when the current in the circuit is too large to ensure the safety of the circuit. The shunt RS can detect the current in the circuit to determine whether overcurrent or undercurrent occurs. The specific connection relationship of the above-mentioned devices in this example can be used as a reference, and the present specification is not limited.

[0199] Referring to Figures 1 to 6 In an embodiment, the second connection port includes a positive terminal and a negative terminal, the positive terminal is connected with the second end of the main fuse, and the negative terminal is connected with the second end of the shunt.

[0200] In this embodiment, the positive terminal of the charging and power distribution module 30 is connected with the second end of the main fuse, and the negative terminal of the charging and power distribution module 30 is connected with the second end of the shunt, so that the charging and power distribution module 30 and the battery connection circuit 10 can share the main fuse and the shunt, thereby protecting the circuit and collecting the current.

[0201] Referring to Figure 12 In an embodiment, the energy conversion device further comprises:

[0202] The DC charging seat 40 has a T-shaped interface, the T-shaped interface includes a first end, a second end and a third end, the first end of the T-shaped interface is connected with the second connection port of the charging and power distribution module 30, and the second end and the third end of the T-shaped interface are respectively connected with the first connection port of the battery connection circuit 10; the charging and power distribution module 30 and the battery connection circuit 10 are connected with external equipment through the DC charging seat 40.

[0203] In this embodiment, the DC charging seat 40 can be a socket for connecting the energy conversion device with a charging pile or other external equipment such as a vehicle, and the DC charging seat 40 can also be provided with a T-shaped wiring port, and the wire harness of the fast charging negative switch S5 needs to pass through the charging and power distribution module 30 to facilitate T-shaped wiring. The T-shaped interface has three terminals, the first end of the T-shaped interface can be connected with the negative terminal in the second connection port of the charging and power distribution module 30, the second end of the T-shaped interface can be connected with the first end in the first connection port of the battery connection circuit 10, and the third end of the T-shaped interface can be connected with the second end in the first connection port of the battery connection circuit 10. The specific connection relationship between the T-shaped interface on the DC charging seat 40 and the charging and power distribution module 30 and the battery connection circuit 10 can be referred to Figure 9In this embodiment, by providing a T-shaped interface on the DC charging seat 40, it is possible to facilitate the modular application of DC charging harnesses for non-boost vehicles to reduce costs.

[0204] In another embodiment, a T-type wiring port can also be reserved in the charging and distribution module 30 to facilitate T-type wiring, so that the modular application of DC charging harnesses for non-boost vehicles can be achieved to reduce costs. The T-type interface is divided into three ends, wherein the first end of the T-type interface can be connected to the second end of any phase of the three-phase winding or the first end of the three-phase winding, the second end of the T-type interface can be connected to the second end of the main positive switch S1, and the third end of the T-type interface can be connected to the second end of the fast charging negative switch S5. The specific structure of this solution can be referred to Figure 6 The specific principle can be referred to the embodiment of setting a T-type interface on the DC charging seat 40. The T-type interface is set in the charging and distribution module 30, and the energy conversion device can be connected to external equipment through the charging and distribution module 30.

[0205] Furthermore, a T-type connection port can be reserved in the battery connection circuit 10 to facilitate T-type connection and to facilitate modular application of DC charging harness for non-boost vehicles to reduce costs. The T-type interface is divided into three ends, wherein the first end of the T-type interface can be connected to the negative end of the second connection port of the charging and distribution module 30, the second end of the T-type interface can be connected to the second end of the main positive switch S1, and the third end of the T-type interface can be connected to the second end of the fast charge negative switch S5. The specific structure of this solution can be referred to Figure 7 , a T-shaped interface is set in the battery connection circuit 10, and the energy conversion device can be connected to external equipment through the battery connection circuit 10.

[0206] In another embodiment, to solve the problem that the battery output interface is continuously charged due to the lack of a relay to isolate the battery positive terminal and the battery negative terminal from the battery output interface, the present invention provides another connection scheme for the energy conversion device, that is, a scheme in which the capacitor switch S6 is connected to the first connection port of the battery connection circuit. For the specific connection relationship, please refer to Figure 10 This solution can also have the above working mode, and the specific principles will not be repeated here.

[0207] In another embodiment, to solve the problem that the battery output interface is continuously charged due to the lack of a relay to isolate the battery positive and negative connection terminals from the battery output interface, the present invention provides another connection scheme for the energy conversion device, namely, a scheme in which the capacitor switch S6 is connected to the positive terminal of the DC charging station 40. For the specific connection relationship, please refer to Figure 7 Figure 8 This solution can also have the above working mode, and the specific principles will not be repeated here.

[0208] The application further provides a vehicle comprising the battery module and the energy conversion device as described above, wherein the battery module is electrically connected with the first connecting port of the battery connecting circuit 10 of the energy conversion device. The specific structure of the energy conversion device is referred to the above-mentioned embodiments. Since the vehicle adopts all the technical solutions of the above-mentioned embodiments, it has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. In this embodiment, the main positive switch S1 and the main negative switch S2 are integrated in the battery module, so that the conduction or turn-off of the main positive switch S1 and the main negative switch S2 can be controlled by the battery management system.

[0209] The above-mentioned is only the optional embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like made by using the content of the specification and drawings within the technical concept of the application is included in the patent protection scope of the application.

Claims

1. An energy conversion device, characterized by, The energy conversion device comprises: a battery connection circuit comprising a first connection port for connecting a battery and a first switch module, the first switch module comprising a main positive switch and a main negative switch; a motor module comprising an inverter and motor windings, an input end of the inverter being connected to a second end of the first switch module, the motor windings comprising three-phase windings, first ends of the three-phase windings being connected to each other, second ends of the three-phase windings being connected to neutral points of three-phase bridge arms of the inverter in one-to-one correspondence; the main positive switch being connected between a first end of the first connection port and a first bus end of the inverter, and the main negative switch being connected between a second end of the first connection port and a second bus end of the inverter; a charging and power supply module having a second connection port for connecting an external device, the charging and power supply module comprising a fast charging positive switch and a fast charging negative switch, the fast charging positive switch being connected between the first end of the first connection port and the external device, and the fast charging negative switch being connected between a second end of the second connection port and the second end of the first connection port; the charging and power supply module comprising a second capacitor, a first end of the second capacitor being connected to the first end of the first connection port or the fast charging positive switch, and the second connection port 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 controlling the charging and power supply module, the battery connection circuit and the motor module according to a control signal corresponding to a working mode, so as to enable the energy conversion device to operate in the corresponding working mode, the working mode comprising at least one of a motor driving mode for enabling the battery to supply power to the motor, a direct charging mode and a motor boost charging mode for enabling the external device to charge the battery, a motor step-down discharging mode for enabling the battery to charge the external device, and a battery pulse charging and discharging heating mode for enabling the battery to be heated; wherein the controller is configured to control the motor module and the charging and power supply module to heat the battery when receiving the control signal of the battery pulse charging and discharging heating mode, and the battery pulse charging and discharging heating mode comprises a second battery pulse charging and discharging heating mode; when the second connection port is further connected to the second end of any one of the three-phase windings, the second battery pulse charging and discharging heating mode comprises: a fifth energy storage stage, in which the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls a 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 being any one or both of two lower bridge arm switches corresponding to two-phase windings not connected to the second connection port of the charging and power supply module; and / or a sixth energy storage stage, in which the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls a 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 the bridge arm switches of the inverter to be turned off; the first upper bridge arm switch and the first lower bridge arm switch being connected to the same phase winding; and / or In the third energy releasing stage, the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the first upper bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off. 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 releasing stage, the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the lower bridge arm switch of the inverter which is turned on in the fifth energy storing stage to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off. When the second connecting port is connected to the first end of the three-phase winding, the second battery pulse charging and discharging heating mode comprises: In the fifth energy storing stage, the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls at least one lower bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off; and / or In the sixth energy storing stage, the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter which is turned on in the fifth energy storing stage to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off; and / or In the third energy releasing stage, the controller controls the main positive switch to be turned on, controls the main negative switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter which is turned on in the fifth energy storing stage to be turned on; and / or In the fourth energy releasing stage, the controller controls the main negative switch to be turned on, controls the main positive switch, the fast charging positive switch and the fast charging negative switch to be turned off, and controls the lower bridge arm switch of the inverter which is turned on in the fifth energy storing stage to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

2. The energy conversion device of claim 1, wherein, The controller is configured to control the charging and power supply module to stop working to output the voltage output by the battery to the motor winding through the battery connecting circuit when the control signal of the motor driving mode is received.

3. The energy conversion device of claim 1, wherein, The controller is configured to control the charging and power supply module to access the power supply of the 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 superimpose the first energy storage energy of the motor winding and the power supply voltage of the external device and then output to the battery through the battery connecting circuit for charging when the control signal of the motor voltage boosting charging mode is received.

4. The energy conversion device of claim 3, wherein, When the second connecting port is connected to the second end of any one phase of the three-phase winding, the motor voltage boosting charging mode comprises: In the first energy storage stage, the controller controls the fast charging positive switch and the main positive switch to be turned on, controls the main negative switch and the fast charging negative switch to be turned off, and controls a first upper bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off, the first upper bridge arm switch being any one or both of two upper bridge arm switches corresponding to two-phase windings not connected to the second connection port of the charging and power distribution module; and / or, In the boost charging stage, the controller controls the fast charging positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charging negative switch to be turned off, and controls a first lower bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off, the first lower bridge arm switch being connected to the same phase winding as the first upper bridge arm switch.

5. The energy conversion device of claim 3, wherein, When the second connection port is connected to the first end of the three-phase winding, the motor boost charging mode comprises: In the first energy storage stage, the controller controls the fast charging positive switch and the main positive switch to be turned on, controls the main negative switch and the fast charging 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 rest of the bridge arm switches of the inverter to be turned off; and / or, In the boost charging stage, the controller controls the fast charging positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charging negative switch to be turned off, and controls a lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter turned on in the first energy storage stage to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

6. The energy conversion device of claim 1, wherein, The controller is configured to, when receiving the control signal of the motor step-down discharging 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 second energy storage energy of the motor winding to an external device for charging.

7. The energy conversion device of claim 6, wherein, When the second connection port is connected to the second end of any one of the three-phase windings, the motor step-down discharging mode comprises: In the second energy storage stage, the controller controls the fast charging positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charging negative switch to be turned off respectively, and controls a first lower bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off; The first lower bridge arm switch being any one or both of two upper bridge arm switches corresponding to two-phase windings not connected to the second connection port of the charging and power distribution module; and / or, In the step-down discharging stage, the controller controls the fast charging positive switch and the main positive switch to be turned on, controls the fast charging negative switch and the main negative switch to be turned off, and controls a first upper bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off, the first upper bridge arm switch being connected to the same phase winding as the first lower bridge arm switch.

8. The energy conversion device of claim 6, wherein, When the second connection port is connected to the first end of the three-phase winding, the motor step-down discharging mode comprises: In the second energy storage stage, the controller controls the fast charging positive switch and the main negative switch to be turned on, controls the main positive switch and the fast charging negative switch to be turned off, and controls at least one lower bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off; and / or, In the voltage reduction discharging stage, the controller controls the fast charging positive switch and the main positive switch to be turned on, controls the fast charging negative switch and the main negative switch to be turned off, and controls the upper bridge arm switch of the same phase winding as the lower bridge arm switch of the inverter turned on in the second energy storage stage to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

9. The energy conversion device of claim 1, wherein, The battery pulse charging and discharging heating mode includes a first battery pulse charging and discharging heating mode, the motor module includes a first capacitor connected in parallel between the first bus end and the second bus end of the inverter, and the second connection port is connected with the second end of any one phase of the three-phase winding or the first end of the three-phase winding.

10. The energy conversion device of claim 9, wherein, When the second connection port is connected with the second end of any one phase of the three-phase winding, the first battery pulse charging and discharging heating mode includes: In the third energy storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the first upper bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off; The first upper bridge arm switch is any one or both of the two upper bridge arm switches corresponding to the two-phase winding pair not connected with the second connection port of the charging and power distribution module; and / or, In the fourth energy storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the first lower bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off; 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 storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the first lower bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off; 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 storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the upper bridge arm switch of the inverter turned on in the third energy storage stage to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

11. The energy conversion device of claim 9, wherein, When the second connection port is connected with the first end of the three-phase winding, the first battery pulse charging and discharging heating mode includes: In the third energy storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls at least one upper bridge arm switch of the inverter to be turned on and controls the rest of the bridge arm switches of the inverter to be turned off; and / or, In the fourth energy storage stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls a lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter turned on in the third energy storage stage to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off; and / or, In the first energy release stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls a lower bridge arm switch of the same phase winding as the upper bridge arm switch of the inverter turned on in the third energy storage stage to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off; and / or, In the second energy release stage, the controller controls the main positive switch and the fast charging negative switch to be turned on, controls the main negative switch and the fast charging positive switch to be turned off, and controls the upper bridge arm switch of the inverter turned on in the third energy storage stage to be turned on, controls the rest of the bridge arm switches of the inverter to be turned off, or controls all the bridge arm switches of the inverter to be turned off.

12. The energy conversion device of claim 1, wherein, The charging and power distribution module further comprises: A bleeder circuit connected in parallel between the first end and the second end of the second capacitor, the bleeder circuit being configured to pre-charge the second capacitor before the energy conversion device enters the boost charging mode and to discharge the second capacitor after the energy conversion device exits the boost charging mode.

13. The energy conversion device of claim 1, wherein, The controller is further configured to, when receiving the control signal of the direct charging mode, control the charging and power distribution module to output the power supply of the external device to the battery through the battery connection circuit for charging.

14. The energy conversion device of claim 1, wherein, The direct charging mode comprises: A boost switch connected between the fast charging negative switch and the second end of any one of the three-phase windings or the first end of the three-phase windings; In the direct charging stage, the controller controls the fast charging positive switch and the fast charging negative switch to be turned on, and controls the boost switch to be turned off.

15. The energy conversion device of claim 1, wherein, The energy conversion device further comprises: A direct current charging seat through which the charging and power distribution module and the battery connection circuit connect to the external device.

16. The energy conversion device of claim 15, wherein, The energy conversion device further comprises a T-shaped interface provided on the direct current charging seat or the battery connection circuit; The T-shaped interface comprises a first end, a second end and a third end, the first end of the T-shaped interface is connected to the second connection port of the charging and power distribution module, and the second end and the third end of the T-shaped interface are respectively connected to the first connection port of the battery connection circuit.

17. The energy conversion device of any of claims 1-16, wherein, The energy conversion device further comprises a pre-charging switch, a first resistor, a main fuse and a shunt; a first end of the main fuse is connected with a first end of a first connecting port of the battery connecting circuit, a first end of the shunt is connected with a second end of the first connecting port of the battery connecting circuit, 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 with a first end of the pre-charging switch, a second end of the main positive switch and a second end of the pre-charging switch are connected, and a second end of the shunt is connected with a first end of the main negative switch.

18. A vehicle characterized by comprising: The battery module and the energy conversion device as claimed in any one of claims 1-17 are electrically connected.

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