CN118269754A

CN118269754A - Energy conversion device and vehicle

Info

Publication number: CN118269754A
Application number: CN202410310432.6A
Authority: CN
Inventors: 刘光生; 徐海清; 王保; 仲亮
Original assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Current assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date: 2024-03-18
Filing date: 2024-03-18
Publication date: 2024-07-02

Abstract

The invention discloses an energy conversion device and a vehicle, comprising: the battery connecting circuit comprises a battery positive electrode connecting end and a battery negative electrode connecting end, wherein the battery middle connecting end is connected with a middle point of the battery pack, the main positive switch is connected between the battery positive electrode connecting end and a positive electrode input end of an inverter in the motor module, the main negative switch is connected between the battery negative electrode connecting end and a negative electrode input end of the inverter, and the middle switch is connected between the battery middle connecting end and a second end of any one phase of the three-phase windings or a first end of the three-phase windings; the first ends of the three-phase windings in the motor module are connected with each other, and the second ends of the three-phase windings are connected with the three-phase bridge arms one to one; the positive electrode end of the charging and distribution module is connected with the positive electrode connecting end of the battery or the second end of the main positive switch, and the negative electrode end of the charging and distribution module is connected with the negative electrode connecting end of the battery or the second end of the main negative switch; the controller is capable of controlling the energy conversion device to heat the battery pack in each of the operating modes. The invention aims to realize self-heating of the battery pack under various working conditions.

Description

Energy conversion device and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to an energy conversion device and a vehicle.

Background

When the electric vehicle is used in a low-temperature environment, the problems of long charging time, low Wen Xuhang mileage attenuation and insufficient power when the vehicle is started under the low-temperature condition exist; the current heating modes of the battery are mainly divided into two modes: external heating and internal heating. External heating is mainly realized by a heat conduction or heat convection way, and the battery is externally heated by a liquid heating plate, a heating film and the like, but the heating efficiency is lower and the heating speed is lower in the mode. The internal heating means self-heating of the battery core, and heat is directly generated in the battery, so that the heating efficiency is higher and the heating speed is faster.

The existing battery self-heating scheme mainly enables the battery and the motor to generate weak short circuit through controlling the motor controller, the battery is rapidly heated under the action of pulse current formed by a high-voltage loop, the existing scheme needs to multiplex the motor controller and the motor to continuously perform pulse charge and discharge, and the existing scheme can only be used for vehicle static working conditions before charging and before driving and has certain limitations.

Disclosure of Invention

The invention mainly aims to provide an energy conversion device which aims to realize self-heating of a battery pack under various working conditions.

In order to achieve the above object, the present invention provides an energy conversion device comprising:

The battery connecting circuit comprises a battery positive electrode connecting end, a battery negative electrode connecting end, a battery middle connecting end, a middle switch, a main positive switch and a main negative switch, wherein the battery positive electrode connecting end, the battery negative electrode connecting end, the battery middle connecting end, the middle switch, the main positive switch and the main negative switch are used for connecting a battery pack;

The motor module comprises an inverter and a motor winding, wherein a first converging end of the inverter is connected with a second end of the main positive switch, a second converging end of the inverter is connected with a second end of the main negative switch, the motor winding comprises three-phase windings, the first ends of the three-phase windings are connected with each other, the second ends of the three-phase windings are connected with neutral points of three-phase bridge arms of the inverter in a one-to-one correspondence manner, and the second end of the intermediate switch is connected with a second end of any one phase of the three-phase windings or with the first end of the three-phase winding;

The charging and distributing module is provided with a positive end and a negative end which are used for being connected with external equipment, the positive end of the charging and distributing module is connected with the positive end of the battery or the second end of the main positive switch, the negative end of the charging and distributing module is connected with the negative end of the battery or the second end of the main negative switch, and the negative end of the charging and distributing module is also connected with the second end of any one phase of the three-phase winding or the first end of the three-phase winding;

The controller is used for controlling the charging and distributing module, the battery connecting circuit and the motor module according to control signals corresponding to the working modes so that the energy conversion device runs corresponding working modes and heats the battery pack in each working mode; the operation mode includes at least one of a motor driving mode for causing the battery to supply power to the motor, a direct charging mode or a boost charging mode for causing the external device to charge the battery, a buck discharging mode for causing the battery to charge the external device, and a battery pulse charge-discharge heating mode for heating the battery.

Optionally, the controller is configured to control the battery connection circuit to heat the battery pack by the charging module and the motor module when receiving a control signal of the battery pulse charging/discharging heating mode.

Optionally, the first battery pack is connected in series between the positive electrode connection end and the middle connection end of the battery, the second battery pack is connected in series between the negative electrode connection end and the middle connection end of the battery, and the negative end of the charging module and the second end of the middle switch are connected with the second end of any one phase of the three-phase winding;

Or the charging and distributing module comprises a fast charging positive switch, a fast charging negative switch and a boost switch, wherein the fast charging positive switch is connected between the positive end of the charging and distributing module and external equipment, the fast charging negative switch is connected between the negative end of the charging and distributing module and the negative electrode connecting end of the battery, the boost switch is connected between the negative end of the charging and distributing module and the second end of any one phase of the three-phase winding or the first end of the three-phase winding, and the controller is used for controlling the fast charging positive switch, the fast charging negative switch and the boost switch to be disconnected when receiving a control signal of a battery pulse charging and discharging heating mode.

Optionally, the battery pulse charge-discharge heating mode includes:

In the first energy storage stage, the controller controls the first upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the main positive switch and the intermediate switch to be on and the main negative switch to be off;

The first upper bridge arm switch is any one or two upper bridge arm switches which are not corresponding to the two-phase windings connected with the second end of the intermediate switch; and/or the number of the groups of groups,

In the first energy release stage, the controller controls the first lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the main negative switch and the intermediate switch to be on and the main positive switch to be off;

the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and/or the number of the groups of groups,

The second energy storage stage is characterized in that the controller controls the first lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the main negative switch and the intermediate switch to be on and the main positive switch to be off;

The second energy discharging stage is used for controlling the upper bridge arm switch of the inverter to be conducted in the first energy storage stage to be conducted and controlling the rest bridge arm switches of the inverter to be disconnected; and controlling the main positive switch and the intermediate switch to be on and controlling the main negative switch to be off.

Optionally, the first battery pack is connected in series between the battery positive electrode connection end and the battery middle connection end, the second battery pack is connected in series between the battery negative electrode connection end and the battery middle connection end, and the negative end of the charging module and the second end of the middle switch are connected with the first end of the three-phase winding;

Optionally, the battery pulse charge-discharge heating mode includes:

In the first energy storage stage, the controller controls at least one upper bridge arm switch of the inverter to be conducted and controls other bridge arm switches of the inverter to be disconnected; and controlling the main positive switch and the intermediate switch to be on and the main negative switch to be off; and/or the number of the groups of groups,

In the first energy release stage, the controller controls the conduction of the lower bridge arm switch of the same phase winding as the upper bridge arm switch conducted by the inverter in the first energy storage stage, controls the disconnection of the rest bridge arm switches of the inverter, or controls the disconnection of all bridge arm switches of the inverter; and controlling the main negative switch and the intermediate switch to be on and the main positive switch to be off; and/or the number of the groups of groups,

The controller controls the upper bridge arm switch of the inverter to be conducted in the first energy storage stage, and controls the other bridge arm switches of the inverter to be disconnected; and controlling the main negative switch and the intermediate switch to be on and the main positive switch to be off; and/or the number of the groups of groups,

The second energy release stage, the controller controls the upper bridge arm switch of the inverter to be conducted in the first energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the main positive switch and the intermediate switch to be on and controlling the main negative switch to be off.

Optionally, the controller is further configured to control the charging module to output a power supply of an external device to the battery pack through the battery connection circuit to charge the battery pack and heat the battery pack when receiving the control signal of the direct charging mode.

Optionally, the first battery group is connected in series between the battery positive electrode connection end and the battery middle connection end, the second battery group is connected in series between the battery negative electrode connection end and the battery middle connection end, and the negative end of the charging module and the second end of the middle switch are connected with the second end of any one phase of the three-phase windings.

Optionally, the direct charging mode includes:

In a third energy storage stage, the controller controls the first upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the main positive switch and the intermediate switch to be respectively conducted and controlling the main negative switch to be disconnected;

In a third energy release stage, the controller controls the first lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch and the main negative switch to be on and controlling the main positive switch to be off;

In a fourth energy storage stage, the controller controls the first lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch and the main negative switch to be on and controlling the main positive switch to be off;

A fourth energy release stage, wherein the controller controls the upper bridge arm switch of the inverter to be conducted in the third energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch and the main positive switch to be on and controlling the main negative switch to be off.

Optionally, the first battery pack is connected in series between the battery positive electrode connection end and the battery middle connection end, the second battery pack is connected in series between the battery negative electrode connection end and the battery middle connection end, and the negative end of the charging module and the second end of the middle switch are connected with the first end of the three-phase winding.

Optionally, the direct charging mode includes:

In a third energy storage stage, the controller controls at least one upper bridge arm switch of the inverter to be conducted and controls other bridge arm switches of the inverter to be disconnected; and controlling the main positive switch and the intermediate switch to be respectively conducted and controlling the main negative switch to be disconnected; and/or the number of the groups of groups,

In the third energy discharging stage, the controller controls the conduction of the lower bridge arm switch of the same phase winding as the upper bridge arm switch conducted by the inverter in the third energy storage stage, controls the disconnection of the rest bridge arm switches of the inverter, or controls the disconnection of all bridge arm switches of the inverter; and controlling the intermediate switch and the main negative switch to be on and controlling the main positive switch to be off; and/or the number of the groups of groups,

The controller controls the upper bridge arm switch of the inverter to be conducted in the third energy storage stage, and controls the other bridge arm switches of the inverter to be disconnected; the fast charge positive switch, the fast charge negative switch, the intermediate switch and the main negative switch are controlled to be conducted, and the main positive switch and the capacitor switch are controlled to be disconnected; and/or the number of the groups of groups,

A fourth energy release stage, wherein the controller controls the upper bridge arm switch of the inverter to be conducted in the third energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the fast charge positive switch, the fast charge negative switch, the intermediate switch and the main positive switch to be on, and controlling the main negative switch and the capacitor switch to be off.

Optionally, the controller is configured to control the charging and distributing module to stop working when receiving a control signal of the motor driving mode, so as to output a voltage output by the battery pack to the motor winding through the battery connection circuit, and heat the battery pack.

Or the charging and distributing module further comprises a fast charging positive switch, a fast charging negative switch and a boost switch, wherein the fast charging positive switch is connected between the positive end of the charging and distributing module and external equipment, the fast charging negative switch is connected between the negative end of the charging and distributing module and the negative electrode connecting end of the battery, the boost switch is connected between the negative end of the charging and distributing module and the second end of any one phase of the three-phase winding or the first end of the three-phase winding, and the controller is used for controlling the fast charging positive switch, the fast charging negative switch and the boost switch to be disconnected when receiving a control signal of a motor driving mode.

Optionally, the motor driving mode includes:

in a fifth energy storage stage, the controller controls the first upper bridge arm switch and the second lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch, the main positive switch and the main negative switch to be respectively conducted;

The first upper bridge arm switch is any one of two upper bridge arm switches corresponding to two phase windings which are not connected with the second end of the intermediate switch, and the second lower bridge arm switch is a lower bridge arm switch which is not in the same phase winding as the first upper bridge arm switch in the two phase windings which are not connected with the second end of the intermediate switch; and/or the number of the groups of groups,

In a fifth energy release stage, the controller controls the first lower bridge arm switch and the second lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls the second lower bridge arm switch to be conducted, and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch and the main negative switch to be on and controlling the main positive switch to be off;

The first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding, and the second lower bridge arm switch is a second lower bridge arm switch in a fifth energy storage stage; and/or the number of the groups of groups,

In a sixth energy storage stage, the controller controls the first lower bridge arm switch and the second upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch, the main positive switch and the main negative switch to be respectively conducted;

the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding, and the second upper bridge arm switch and the second lower bridge arm switch in the fifth energy storage stage are connected to the same phase winding; and/or the number of the groups of groups,

In a sixth energy release stage, the controller controls the first upper bridge arm switch and the second upper bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls the second upper bridge arm switch to be conducted, and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch and the main positive switch to be on and controlling the main positive switch to be off;

The first upper bridge arm switch is a first upper bridge arm switch conducted in a fifth energy storage stage, and the second upper bridge arm switch is a second upper bridge arm switch conducted in the fifth energy storage stage.

Optionally, the motor driving mode includes:

The first upper bridge arm switch is any one of three upper bridge arm switches corresponding to three-phase windings, and the second lower bridge arm switch is at least one of two lower bridge arm switches which are not in the same phase winding with the first upper bridge arm switch; and/or the number of the groups of groups,

the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding, and the second lower bridge arm switch is at least one of two lower bridge arm switches which are not in the same phase winding with the first upper bridge arm switch; and/or the number of the groups of groups,

In a sixth energy storage stage, the controller controls the first lower bridge arm switch and the second upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch, the main positive switch and the main negative switch to be respectively conducted

The second upper bridge arm switch is at least one of two upper bridge arm switches which are not in the same phase winding with the first upper bridge arm switch, and the first lower bridge arm switch and the first upper bridge arm switch are connected to the same phase winding; and/or the number of the groups of groups,

The first upper bridge arm switch is a first upper bridge arm switch in a fifth energy storage stage, and the second upper bridge arm switch is at least one of two upper bridge arm switches which are not in the same phase winding with the first upper bridge arm switch.

Optionally, the controller is configured to control the charging module to output a power supply of an external device to the battery pack through the battery connection circuit to charge the battery pack and heat the battery pack when receiving the control signal of the boost charging mode.

Optionally, the controller is configured to control the charging and distributing module to output a power supply of the battery pack to an external device for charging and heat the battery pack when receiving the control signal of the buck discharging mode.

Optionally, the first battery group is connected in series between the battery positive electrode connection end and the battery middle connection end, the second battery group is connected in series between the battery negative electrode connection end and the battery middle connection end, the charging distribution module comprises a fast charging positive switch, a fast charging negative switch, a boost switch, a first capacitor and a capacitor switch, the fast charging positive switch is connected between the positive electrode end of the charging distribution module and external equipment, the fast charging negative switch is connected between the negative electrode end of the charging distribution module and the battery negative electrode connection end, the boost switch is connected between the negative electrode end of the charging distribution module and the second end of any one of the three-phase windings or the first end of the three-phase winding, the capacitor switch and the first capacitor are connected in series between the fast charging positive switch and the fast charging negative switch in sequence, and the second end of the negative electrode end of the charging distribution module and the middle switch are connected with the second end of any one of the three-phase windings.

Optionally, the boost charging mode and the buck discharging mode include:

A seventh energy storage stage, wherein the controller controls the first upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; the intermediate switch, the fast charge positive switch, the boost switch and the main positive switch are controlled to be turned on, and the fast charge negative switch, the capacitor switch and the main negative switch are controlled to be turned off;

A seventh energy release stage, wherein the controller controls the first lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; the intermediate switch, the fast charge positive switch, the boost switch and the main negative switch are controlled to be turned on, and the fast charge negative switch, the capacitor switch and the main positive switch are controlled to be turned off;

In an eighth energy storage stage, the controller controls the first lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; the intermediate switch, the fast charge positive switch, the boost switch and the main negative switch are controlled to be turned on, and the fast charge negative switch, the capacitor switch and the main positive switch are controlled to be turned off;

In an eighth energy discharging stage, the controller controls the first upper bridge arm switch of the inverter to be conducted in the seventh energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch, the fast charge positive switch, the boost switch and the main positive switch to be on, and controlling the fast charge negative switch, the capacitor switch and the main positive switch to be off.

Optionally, the first battery group is connected in series between the battery positive electrode connection end and the battery middle connection end, the second battery group is connected in series between the battery negative electrode connection end and the battery middle connection end, the charging distribution module comprises a fast charging positive switch, a fast charging negative switch, a boost switch, a first capacitor and a capacitor switch, the fast charging positive switch is connected between the positive electrode end of the charging distribution module and external equipment, the fast charging negative switch is connected between the negative electrode end of the charging distribution module and the battery negative electrode connection end, the boost switch is connected between the negative electrode end of the charging distribution module and the second end of any one of the three-phase windings or the first end of the three-phase windings, the capacitor switch and the first capacitor are connected in series between the fast charging positive switch and the fast charging negative switch in sequence, and the negative electrode end of the charging distribution module and the second end of the middle switch are connected with the first end of the three-phase windings.

Optionally, the boost charging mode and the buck discharging mode include:

A seventh energy storage stage, wherein the controller controls at least one upper bridge arm switch of the inverter to be conducted and controls other bridge arm switches of the inverter to be disconnected; the intermediate switch, the fast charge positive switch, the boost switch and the main positive switch are controlled to be turned on, and the fast charge negative switch, the capacitor switch and the main negative switch are controlled to be turned off; and/or the number of the groups of groups,

A seventh energy release stage, wherein the controller controls the conduction of the lower bridge arm switch of the same phase winding as the upper bridge arm switch conducted by the inverter in the seventh energy storage stage, controls the disconnection of the rest bridge arm switches of the inverter, or controls the disconnection of all bridge arm switches of the inverter; the intermediate switch, the fast charge positive switch, the boost switch and the main negative switch are controlled to be turned on, and the fast charge negative switch, the capacitor switch and the main positive switch are controlled to be turned off; and/or the number of the groups of groups,

In an eighth energy storage stage, the controller controls the conduction of a lower bridge arm switch of the same phase winding as an upper bridge arm switch conducted by the inverter in a seventh energy storage stage, and controls the disconnection of the rest bridge arm switches of the inverter; the intermediate switch, the fast charge positive switch and the main negative switch are controlled to be turned on, and the fast charge negative switch, the boost switch, the capacitor switch and the main positive switch are controlled to be turned off; and/or the number of the groups of groups,

An eighth energy discharging stage, wherein the controller controls the upper bridge arm switch which is conducted with the inverter in the seventh energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch, the fast charge positive switch, the boost switch and the main positive switch to be on, and controlling the fast charge negative switch, the capacitor switch and the main positive switch to be off.

Optionally, the charging and distributing module further comprises a boost switch, wherein a first end of the boost switch is connected with a second end of any one phase of the three-phase winding or connected with a first end of the three-phase winding, a second end of the boost switch is connected with a negative electrode end of the charging and distributing module, and a second end of the intermediate switch is connected with a first end of the boost switch;

The operation mode includes at least one of a motor driving mode for causing the battery to supply power to the motor, a direct charging mode or a boost charging mode for causing the external device to charge the battery, a buck discharging mode for causing the battery to charge the external device, and a battery pulse charge-discharge heating mode for heating the battery.

Optionally, the charging and distributing module further comprises a boost switch, wherein a first end of the boost switch is connected with a second end of any one phase of the three-phase winding or connected with a first end of the three-phase winding, a second end of the boost switch is connected with a negative electrode end of the charging and distributing module, and a second end of the intermediate switch is connected with a second end of the boost switch;

The operation mode includes at least one of a motor driving mode for causing the battery to supply power to the motor, a step-up charging mode for causing the external device to charge the battery, a step-down discharging mode for causing the battery to charge the external device, and a battery pulse charge-discharge heating mode for heating the battery.

Optionally, the charging and distributing module further comprises a first inductor, wherein the first inductor is connected in series between a second end of one phase of the three-phase winding or a first end of the three-phase winding and a negative electrode end of the charging and distributing module.

Optionally, the energy conversion device further comprises a precharge switch, a first resistor, a main fuse and a shunt; the first end of the main fuse and the first end of the shunt are connected with the first interface, the second end of the main fuse, the first end of the main positive switch and the first end of the first resistor are connected, the second end of the first resistor is connected with the first end of the pre-charging switch, the second end of the first switch module is connected with the second end of the pre-charging switch, and the second end of the shunt is connected with the first end of the first switch module.

The invention also provides a vehicle which comprises the battery module and the energy conversion device, wherein the positive electrode of the battery module is connected with the positive electrode connecting end of the battery in the energy conversion device, and the negative electrode of the battery module is connected with the negative electrode connecting end of the battery in the energy conversion device.

The invention can convert the output voltage of the charging equipment or the output voltage of the vehicle by the energy conversion device formed by the battery connecting circuit, the motor module, the charging and distribution module and the controller, thereby converting the output voltage of the external equipment and outputting the converted output voltage to the battery in the vehicle for charging or converting the output voltage of the battery in the vehicle and outputting the converted output voltage to the external equipment for charging, and the battery pack can be heated while the energy conversion is carried out in different modes, thereby ensuring that the vehicle can self-heat the battery pack in a stationary or running state, further improving the heating rate of the battery pack, improving the battery from low temperature to normal temperature in a shorter time, further shortening the charging waiting time and relieving the problem of the reduction of the endurance mileage. The connection relation between the positive electrode end and the negative electrode end of the charging and distribution module and the battery positive electrode connection end, the battery negative electrode connection end, the main positive switch and the main negative switch in the battery connection circuit is changed, or the connection relation between the second end of the intermediate switch and the first end and the second end of the three-phase winding is changed, so that the energy conversion device with different structures can be formed, and the energy conversion device is suitable for different scenes.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic circuit diagram of an embodiment of an energy conversion device according to the present invention;

FIG. 2 is a schematic circuit diagram of another embodiment of the energy conversion device of the present invention;

FIG. 3 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

FIG. 5 is a schematic circuit diagram of another embodiment of the energy conversion device of the present invention;

FIG. 6 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

FIG. 7 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

FIG. 8 is a schematic circuit diagram of another embodiment of an energy conversion device according to the present invention;

FIG. 9 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

FIG. 10 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

FIG. 11 is a schematic circuit diagram of another embodiment of an energy conversion device according to the present invention;

FIG. 12 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

FIG. 13 is a schematic circuit diagram of an energy conversion device according to another embodiment of the present invention;

Fig. 14 is a schematic circuit diagram of another embodiment of the energy conversion device of the present invention.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

In order to solve the above problems, the present invention provides an energy conversion device.

Referring to fig. 1, in an embodiment of the present invention, the energy conversion device includes:

the battery connection circuit 10 comprises a battery positive electrode connection end, a battery negative electrode connection end, a battery middle connection end, a middle switch S8, a main positive switch S1 and a main negative switch S2, wherein the battery positive electrode connection end, the battery negative electrode connection end, the battery middle connection end, the battery positive electrode connection end, the battery middle connection end, the middle switch S8 and the battery middle connection end are connected in series;

the motor module 20 comprises an inverter and a motor winding, wherein the positive input end of the inverter is connected with the second end of the main positive switch S1, the negative input end of the inverter is connected with the second end of the main negative switch S2, the motor winding comprises three-phase windings, the first ends of the three-phase windings are connected with each other, the second ends of the three-phase windings are connected with neutral points of three-phase bridge arms of the inverter in a one-to-one correspondence manner, and the second end of the intermediate switch S8 is connected with the second end of any phase of the three-phase windings or the first end of the three-phase windings;

A charging and distributing module 30 having a positive terminal and a negative terminal for connecting with an external device, wherein the positive terminal of the charging and distributing module 30 is connected with the positive terminal of the battery or the second terminal of the main positive switch S1, and the negative terminal of the charging and distributing module 30 is connected with the negative terminal of the battery or the second terminal of the main negative switch S2, and the negative terminal of the charging and distributing module 30 is also connected with the second terminal of any one phase of the three-phase windings or the first terminal of the three-phase windings;

The controller is used for controlling the charging and distribution module 30, the battery connection circuit 10 and the motor module 20 according to control signals corresponding to the working modes so that the energy conversion device runs corresponding working modes and performs battery pulse charging and discharging heating in each working mode; the operation mode includes at least one of a motor driving mode for causing the battery to supply power to the motor, a direct charging mode or a boost charging mode for causing the external device to charge the battery, a buck discharging mode for causing the battery to charge the external device, and a battery pulse charge-discharge heating mode for heating the battery.

In this embodiment, the battery connection circuit 10 may be connected to a battery module in a vehicle, specifically may be connected to a positive electrode of a battery pack through a positive electrode connection end of the battery, connected to a negative electrode of the battery pack through a negative electrode connection end of the battery, and connected to a middle point of the battery pack through a middle connection end of the battery pack, where the battery pack may be formed by connecting a plurality of battery cells in series, the middle point of the battery pack may be a middle point of the plurality of battery cells, and the number of battery cells on both sides of the middle connection end of the battery may be configured according to a user requirement. In this embodiment, the connection between the motor module 20 and the battery pack can be controlled to be on-off by controlling the on or off of the intermediate switch S8, the main positive switch S1 and the main negative switch S2, so as to form different loops, so that pulse charge-discharge heating of the battery pack can be realized in different working modes. The intermediate switch S8, the main positive switch S1, and the main negative switch S2 in this embodiment may be relays or other switching devices.

In this embodiment, the inverter in the motor module 20 may include three half-bridges, i.e., branch pairs, each including a series circuit formed by upper and lower controllable semiconductor switches, i.e., one half-bridge including an upper bridge arm switching tube and a lower bridge arm switching tube; the upper side and the lower side controllable semiconductor switches can be respectively connected with a diode in parallel; the common end of the switching tubes at the upper sides of the three half-bridges is the positive electrode confluence end of the inverter, namely the positive electrode of the input end of the inverter, and the common end of the switching tubes at the lower sides of the three half-bridges is the negative electrode confluence end of the inverter, namely the negative electrode of the input end of the inverter. The specific structure of the inverter in this embodiment may be referred to herein without limitation. The motor winding can select three-phase windings, three half-bridges corresponding to the inverter are connected, first ends of the three-phase windings are connected with each other, and second ends of the three-phase windings can be connected with neutral points of three bridge arms of the inverter in a one-to-one correspondence mode. Thus, by controlling the on and off of the switches in the inverter, different loops can be formed with the three-phase windings to correspond to different working modes.

In this embodiment, the charging and distribution module 30 may connect the positive and negative poles of the external device through the positive and negative poles; the charging module 30 may further include a plurality of switching devices, such as a switch disposed between a positive terminal and an external device, a switch disposed between a positive terminal and a battery negative terminal or a second terminal of the main negative switch S2, and a switch disposed between a negative terminal of the charging module 30 and the motor module 20, and by controlling the on and off of the switch, the energy conversion device may be made to form different loops to correspond to different operation modes in combination with the on or off of the switch in the above description. It should be noted that, by changing the connection relationship between the charge and power distribution module 30 and the ports between the battery connection circuit 10 and the motor module 20, a charge and discharge parallel scheme, a charge and discharge serial scheme, and a charge and discharge serial and parallel scheme may be formed. For example, the positive electrode end of the charging and distribution module 30 is connected with the positive electrode connection end of the battery, and the negative electrode end of the charging and distribution module 30 is connected with the negative electrode connection end of the battery, which is a parallel scheme of charging and discharging loops. The positive terminal of the charging and distributing module 30 is connected with the second terminal of the main positive switch S1, and the negative terminal of the charging and distributing module 30 is connected with the second terminal of the main negative switch S2, so that a charging and discharging loop series scheme is adopted. Connecting the positive end of the charging and distributing module 30 with the second end of the main positive switch S1, and connecting the negative end of the charging and distributing module 30 with the negative electrode connecting end of the battery; or the positive end of the charging and distributing module 30 is connected with the positive electrode connecting end of the battery, and the negative end of the charging and distributing module 30 is connected with the second end of the main negative switch S2, so that the charging and discharging loop series-parallel scheme is adopted. Compared with the charge-discharge loop parallel scheme, in the charge-discharge loop series scheme, a relay is arranged between the battery positive electrode connection end and the battery negative electrode connection end of the battery connection circuit 10 and the output interface of the battery for isolation, so that the battery output interface can not be continuously electrified. In the charge-discharge loop series scheme, the main positive switch S1 and the main negative switch S2 are shared when in the boost charging mode and in the normal direct charging mode, so that the specification and the model selection requirements of the main positive switch S1 and the main negative switch S2 are higher, and the cost is higher. Therefore, the problem that the battery output interface is continuously electrified can be solved by a charge-discharge loop series scheme or a charge-discharge loop series-parallel scheme. Specific circuits of the charge-discharge parallel scheme can be referred to fig. 1 and 2; the specific circuit of the charge-discharge series scheme can refer to fig. 3 and fig. 4, and compared with the charge-discharge parallel scheme, the charge-discharge series scheme can isolate the anode and cathode of the battery pack from the interface of the battery connection circuit 10 through a relay, so that the interface of the battery connection circuit 10 is prevented from being electrified continuously; specific circuits of the charge-discharge serial-parallel scheme may refer to fig. 5 and 6, and the charge-discharge serial-parallel scheme also has the same effect as the charge-discharge serial scheme. Therefore, the user can select the corresponding connection scheme according to the requirements, so that the method is suitable for different application scenes. The circuit structure mentioned in the present embodiment is only referred to, and the specific circuit structure is not limited.

In this embodiment, the controller is not shown in the drawings, and the output end of the controller may be connected to each switching device and the controlled end of the module, so that the output electrical signal controls the switching device to be turned on or off, and controls the different modules to work. The controller may be a digital signal Processor (DIGITAL SIGNAL Processor, DSP for short), programmable logic device (Programmable Logic Device, PLD for short), microprocessor, MCU, or other electronic component. The controller can receive control signals corresponding to different working modes output by management equipment or external equipment in the vehicle, so that the energy conversion device runs in the corresponding working modes, pulse charge and discharge heating is carried out on the battery pack in different working modes, and the pulse charge and discharge heating of the battery pack can be specifically repeated charge and discharge of the battery pack, and pulse generation is carried out on the battery pack. The control signals of the different modes may be electrical signals of different voltage values or output in other forms. The external device may be another vehicle or a charging stake or the like. For example, when the vehicle does not need to be charged, and other vehicles do not need to be charged, the controller receives a control signal of the motor driving mode, controls the battery pack to supply power to the motor, and heats the battery pack. When the external device charges the vehicle, the controller can receive a control signal of a direct charging mode or a boost charging mode and heat the battery pack; the direct charging mode is to directly output the voltage output by the external equipment to the battery pack of the vehicle for charging, and the boost charging mode is to boost the voltage output by the external equipment and then output the boosted voltage to the battery pack of the vehicle for charging; when the vehicle needs to charge the external equipment, the controller can receive a control signal of a buck discharging mode and heat the battery pack; the step-down discharging mode is to step down the voltage output by the battery pack of the vehicle and then output the voltage to external equipment for power supply; and under the condition that the ambient temperature is low and the vehicle is stationary or running before running, the controller receives a control signal of the battery pulse charge-discharge heating mode to directly heat the battery pack.

The invention can convert the output voltage of the charging equipment or the output voltage of the vehicle by the energy conversion device formed by the battery connecting circuit 10, the motor module 20, the charging and distribution module 30 and the controller, so as to convert the output voltage of the external equipment and output the converted output voltage to the battery in the vehicle for charging or convert the output voltage of the battery in the vehicle and output the converted output voltage to the external equipment for charging, and the battery pack can be heated while the energy conversion is carried out in different modes, thereby ensuring that the vehicle can self-heat the battery pack in a stationary or running state, further improving the heating rate of the battery pack, improving the battery from low temperature to normal temperature in a shorter time, further shortening the charging waiting time and relieving the problem of descending of the endurance mileage. By changing the connection relationship between the positive pole terminal and the negative pole terminal of the charging and distribution module 30 and the positive pole terminal, the negative pole terminal, the main positive switch S1 and the main negative switch S2 of the battery in the battery connection circuit 10, or the connection relationship between the second terminal of the intermediate switch S8 and the first terminal and the second terminal of the three-phase winding, energy conversion devices with different structures can be formed, and the device is suitable for different scenes.

In one embodiment, the controller is configured to control the battery connection circuit 10 to heat the battery pack by the charging and power distribution module 30 and the motor module 20 when receiving the control signal of the battery pulse charging and discharging heating mode.

In this embodiment, under the stationary working conditions of the vehicle before charging and before driving, the battery pack can be directly self-heated, and a battery pulse charge-discharge heating mode can be entered at this time, and the battery pack is repeatedly charged and discharged, so that the battery pack is heated.

In the battery pulse charge-discharge heating mode, the first battery pack is connected in series between the battery positive electrode connection end and the battery middle connection end, the second battery pack is connected in series between the battery negative electrode connection end and the battery middle connection end, and the negative end of the charge distribution module 30 and the second end of the middle switch S8 are connected with the second end of any one phase of the three-phase windings. The battery pulse charge-discharge heating mode in this case will be described with reference to fig. 1 to 6.

Referring to fig. 1 to 6, in an embodiment, the battery pulse charge-discharge heating mode includes:

In the first energy storage stage, the controller controls the first upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the main positive switch S1 and the intermediate switch S8 to be conducted and controlling the main negative switch S2 to be disconnected;

The first upper bridge arm switch is any one or two upper bridge arm switches which are not corresponding to the two-phase windings connected with the second end of the intermediate switch S8; and/or the number of the groups of groups,

In the first energy release stage, the controller controls the first lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the main negative switch S2 and the intermediate switch S8 to be conducted and controlling the main positive switch S1 to be disconnected;

The second energy storage stage is characterized in that the controller controls the first lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the main negative switch S2 and the intermediate switch S8 to be conducted and controlling the main positive switch S1 to be disconnected;

The second energy discharging stage is used for controlling the upper bridge arm switch of the inverter to be conducted in the first energy storage stage to be conducted and controlling the rest bridge arm switches of the inverter to be disconnected; and controlling the main positive switch S1 and the intermediate switch S8 to be conducted and controlling the main negative switch S2 to be disconnected.

In this embodiment, when the first energy storage stage controller controls the corresponding switch to be turned on or off, the power supply voltage output by the first battery pack is transmitted to the motor winding to store energy. When the controller controls the corresponding switch to be switched on or off in the first energy discharging stage, the first energy storage energy of the motor winding can be transmitted to the second battery pack for charging. When the controller controls the corresponding switch to be switched on or off in the second energy storage stage, the power supply voltage output by the second battery pack can be transmitted to the motor winding to store energy. When the controller controls the corresponding switch to be switched on or off in the second energy discharging stage, the first energy storage energy of the motor winding can be transmitted to the first battery pack for charging.

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 according to a preset duty ratio, and as shown by a calculation formula of the voltage on the inductor, the voltage value of the inductor can be changed by changing the on time of the bridge arm switch under the condition that the inductance and the current in the circuit are unchanged. The specific duty ratio can be set according to user requirements, for example, in the first energy storage stage, the voltage value of the inductor can be controlled to be smaller 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 follow-up control process is similar, the voltage value of the inductor is changed by controlling the duty ratio, and the battery pack charges the inductor or the inductor discharges the battery pack.

And when the bridge arm switches of the inverter are controlled to be all opened, current in the circuit can freewheel through a diode connected in parallel with a switching tube in phase with the switching tube conducted in the previous stage. For example, in a first energy storage stage, the controller controls the first upper bridge arm switch of the inverter to be turned on, in a first energy release stage, the controller controls the bridge arm switches of the inverter to be turned off all, and at the moment, current can pass through the diodes connected in parallel with the first lower bridge arm switch to form a loop; of course, the first lower bridge arm switch can be controlled to be conducted to form a loop, so that the energy release speed of the motor winding is higher. The subsequent process of controlling the opening of the bridge arm switch of the inverter in this specification is the same as the original one in this embodiment.

Further, in this embodiment, the first energy storage stage, the first energy release stage, the second energy storage stage and the second energy release stage in the battery pulse charge-discharge heating mode may be combined to achieve different effects, for example, the first energy storage stage, the first energy release stage, the second energy storage stage and the second energy release stage are sequentially and cyclically executed, and the power supply voltage output by the first battery pack may be transmitted to the motor winding for energy storage in the first energy storage stage, and may be switched to the first energy release stage when the first energy storage energy reaches a first preset energy value; transmitting the first energy storage energy of the motor winding to the second battery pack for charging until the voltage of the motor winding is lower than a second preset energy value, and switching to a second energy storage stage; transmitting the power supply voltage output by the second battery pack to the motor winding for energy storage, and switching to a second energy release stage when the first energy storage energy reaches a third preset energy value; and transmitting the first energy storage energy of the motor winding to the first battery pack for charging until the first energy storage energy of the motor winding is lower than a fourth preset energy value, and switching to a first energy storage stage. The first battery pack and the second battery pack can be repeatedly charged and discharged, so that self-heating of the battery packs is realized. The energy storage charging speed of the winding can be tested in advance, the energy discharge of the motor winding is controlled after the energy charging time of the winding reaches the preset time, and the energy charge of the motor winding is controlled after the energy discharge time of the winding reaches the preset time. The battery pulse charge-discharge heating mode can be suitable for the stationary working conditions of the vehicle before the vehicle is charged and before the vehicle runs. It should be noted that, in this embodiment, the first preset energy value to the fourth preset energy value may be set according to the energy value required when the battery pack performs pulse self-heating in practical application, and if the energy is too small, the heating efficiency may be low; if the energy is too high, the temperature may rise too quickly, damaging the battery. The specific energy value can be obtained from the heat capacity (C) of the battery and the temperature (Δt) to be raised. The required heating energy (Q) is calculated, for example, by the following formula: q=c×Δt. The first preset energy value may thus be the heating energy required by the second battery pack, the second preset energy value may be 0, i.e. representing the energy in the motor winding at this time being transferred to the second battery pack, the second preset energy value may also be other values, without limitation, but needs to be lower than the first preset energy value, and the difference between the first preset energy value and the second preset energy value may satisfy the energy condition for heating the second battery pack. The third preset energy value may be the heating energy required by the first battery pack, and the fourth preset energy value may be 0 or other values, which is not limited herein.

The user may also combine or expand the multiple stages in the battery pulse charge-discharge heating mode according to actual needs, and the specific principles may be referred to the above description without limitation.

In another embodiment, in the battery pulse charge-discharge heating mode, the first battery pack is connected in series between the battery positive electrode connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative electrode connection terminal and the battery intermediate connection terminal, and the negative terminal of the charge-distribution module 30 and the second terminal of the intermediate switch S8 are connected to the first terminal of the three-phase winding;

or the charging and distributing module further comprises a fast charging positive switch S4, a fast charging negative switch S5 and a boost switch S7, wherein the fast charging positive switch S4 is connected between the positive terminal of the charging and distributing module and external equipment, the fast charging negative switch S5 is connected between the negative terminal of the charging and distributing module and the negative terminal of the battery, the boost switch S7 is connected between the negative terminal of the charging and distributing module and the second terminal of any one phase of the three-phase winding or the first terminal of the three-phase winding, and the controller is used for controlling the fast charging positive switch S4, the fast charging negative switch S5 and the boost switch S7 to be disconnected when receiving a control signal of a battery pulse charging and discharging heating mode.

Referring to fig. 1 to 6, the battery pulse charge-discharge heating mode includes:

In the first energy storage stage, the controller controls at least one upper bridge arm switch of the inverter to be conducted and controls other bridge arm switches of the inverter to be disconnected; and controlling the main positive switch S1 and the intermediate switch S8 to be conducted and controlling the main negative switch S2 to be disconnected; and/or the number of the groups of groups,

In the first energy release stage, the controller controls the conduction of the lower bridge arm switch of the same phase winding as the upper bridge arm switch conducted by the inverter in the first energy storage stage, controls the disconnection of the rest bridge arm switches of the inverter, or controls the disconnection of all bridge arm switches of the inverter; and controlling the main negative switch S2 and the intermediate switch S8 to be conducted and controlling the main positive switch S1 to be disconnected; and/or the number of the groups of groups,

The controller controls the upper bridge arm switch of the inverter to be conducted in the first energy storage stage, and controls the other bridge arm switches of the inverter to be disconnected; and controlling the main negative switch S2 and the intermediate switch S8 to be conducted and controlling the main positive switch S1 to be disconnected; and/or the number of the groups of groups,

The second energy release stage, the controller controls the upper bridge arm switch of the inverter to be conducted in the first energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the main positive switch S1 and the intermediate switch S8 to be conducted and controlling the main negative switch S2 to be disconnected.

It can be understood that, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are 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 and to be different from the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are connected to the second end of any one phase of the three-phase winding, for example, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are connected to the first end of the three-phase winding, jitter can be prevented from occurring in the charging process; the control of the bridge arm switches can be more flexible, for example, when the negative end of the charging module 30 and the second end of the intermediate switch S8 are connected with the second end of any one phase of the three-phase winding, at most two upper bridge arm switches or lower bridge arm switches are controlled to be conducted, and in the embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be conducted, so that the integral voltage of the three-phase winding can be changed, and the energy storage and energy release speeds of the three-phase winding are changed; for example, the more bridge arm switches are conducted, the higher the voltage of the whole three-phase winding is, the faster the energy storage and release speeds of the three-phase winding are, and the specific quantity of the conducted bridge arm switches can be determined according to the actual voltage requirements of users. The battery pack can be self-heated in both connection modes, and other combination modes and specific working principles of the multiple stages, control of the bridge arm switch duty ratio, and setting of preset energy values of the multiple stages can be referred to the description of the above embodiments, and are not repeated here.

In this embodiment, the charging and distribution module includes the fast charging positive switch S4, the fast charging negative switch S5, and the boost switch S7, and when the energy conversion device works, the energy transmission paths of the energy conversion device and the external device can be controlled to be turned on or off by controlling the on or off of the fast charging positive switch S4 and the fast charging negative switch S5, so as to control the efficiency of the charging and discharging process. In the battery pulse charge-discharge heating mode, energy transmission with external equipment is not required, so in this embodiment, the fast charge positive switch S4, the fast charge negative switch S5, and the boost switch S7 can be turned off.

In an embodiment, the controller is further configured to control the charging module 30 to output a power source of an external device to the battery pack through the battery connection circuit 10 to charge the battery pack and heat the battery pack when receiving the control signal of the direct charging mode.

In the present embodiment, when the output voltage of the external device is greater than or equal to the charge request voltage of the battery in the vehicle, the battery pack may be directly charged by the external device. Therefore, the voltage of the external equipment and the voltage of the vehicle can be judged through the management equipment, when the output voltage of the external equipment is larger than the charging request voltage of the battery pack in the vehicle, the direct charging mode is determined to be entered, and the specific preset value can be set according to the requirement of a user; for example, when the charging voltage of the battery pack is 500V and the output voltage of the charging pile or the output voltage of the external vehicle is 700V, the direct charging mode may be entered, and the power source of the external device is output to the battery pack through the battery connection circuit 10 to charge the battery pack. And in the direct charging mode, the battery pack is repeatedly charged and discharged, thereby realizing self-heating of the battery pack. When the external device charges the battery pack, the battery pack is heated, and the charging time can be shortened.

Further, in an embodiment, the first battery pack is connected in series between the positive battery connection terminal and the middle battery connection terminal, the second battery pack is connected in series between the negative battery connection terminal and the middle battery connection terminal, and the negative terminal of the charging module 30 and the second terminal of the middle switch S8 are connected with the second terminal of any one phase of the three-phase windings;

Or the charging and distributing module further comprises a fast charging positive switch S4, a fast charging negative switch S5 and a boost switch S7, wherein the fast charging positive switch S4 is connected between the positive terminal of the charging and distributing module and external equipment, the fast charging negative switch S5 is connected between the negative terminal of the charging and distributing module and the negative terminal of the battery, the boost switch S7 is connected between the negative terminal of the charging and distributing module and the second terminal of any one phase of the three-phase winding or the first terminal of the three-phase winding, and the controller is used for controlling the fast charging positive switch S4, the fast charging negative switch S5 and the boost switch S7 to be disconnected when receiving a control signal of a battery pulse charging and discharging heating mode. The direct charging mode in this case will be described with reference to fig. 1 to 6.

Referring to fig. 1 to 6, in an embodiment, the direct charging mode includes:

In a third energy storage stage, the controller controls the first upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the main positive switch S1 and the intermediate switch S8 to be respectively conducted and controlling the main negative switch S2 to be disconnected;

In a third energy release stage, the controller controls the first lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8 and the main negative switch S2 to be conducted and controlling the main positive switch S1 to be disconnected;

In a fourth energy storage stage, the controller controls the first lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8 and the main negative switch S2 to be conducted and controlling the main positive switch S1 to be disconnected;

A fourth energy release stage, wherein the controller controls the upper bridge arm switch of the inverter to be conducted in the third energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8 and the main positive switch S1 to be conducted and controlling the main negative switch S2 to be disconnected.

In this embodiment, when the controller controls the corresponding switch to be turned on or off in the third energy storage stage, the power supply voltage output by the first battery pack may be transmitted to the motor winding to store energy while the power supply of the external device is output to the battery pack through the battery connection circuit 10 to charge the battery pack. When the controller controls the corresponding switch to be turned on or off in the third energy discharging stage, the power supply of the external device can be output to the battery pack through the battery connecting circuit 10 to charge, and meanwhile, the second energy storage energy of the motor winding is transmitted to the second battery pack to charge. When the controller controls the corresponding switch to be turned on or off in the fourth energy storage stage, the power supply of the external device can be output to the battery pack through the battery connection circuit 10 to charge, and meanwhile, the power supply voltage output by the second battery pack is transmitted to the motor winding to store energy. When the controller controls the corresponding switch to be turned on or off in the fourth energy discharging stage, the power supply of the external device can be output to the battery pack through the battery connecting circuit 10 to charge, and meanwhile, the first energy storage energy of the motor winding is transmitted to the first battery pack to charge.

It should be noted that, in this embodiment, the first upper bridge arm switch and the first lower bridge arm switch may be controlled to be turned on and off by a preset duty ratio, and the specific duty ratio may be set according to the charge-discharge relationship in different stages of the direct charge mode in this embodiment, and referring to the description of the voltage on the inductor in the above embodiment.

Further, the third energy storage stage, the third energy release stage, the fourth energy storage stage and the fourth energy release stage in the direct charging mode in this embodiment may be combined to achieve different effects, such as sequentially executing the third energy storage stage, the third energy release stage, the fourth energy storage stage and the fourth energy release stage in a circulating manner; transmitting the power supply voltage output by the first battery pack to the motor winding for energy storage in a third energy storage stage, and switching to a third energy release stage when the second energy storage energy reaches a fifth preset energy value; transmitting second energy storage energy of the motor winding to the second battery pack for charging until the voltage of the motor winding is lower than a sixth preset energy value, and switching to a fourth energy storage stage; transmitting the power supply voltage output by the second battery pack to the motor winding for energy storage, and switching to a fourth energy release stage when the second energy storage energy reaches a seventh preset energy value; and transmitting the first stored energy of the motor winding to the first battery pack for charging until the first stored energy of the motor winding is lower than an eighth preset energy value, and switching to a third stored energy stage. So can carry out the repeated charge and discharge to first group battery and second group battery to realize when charging to the group battery, can also carry out self-heating to the group battery, can be applicable to the operating mode that external equipment directly charges for the vehicle. The energy storage charging speed of the winding can be tested in advance, the energy discharge of the motor winding is controlled after the energy charging time of the winding reaches the preset time, and the energy charge of the motor winding is controlled after the energy discharge time of the winding reaches the preset time. The fifth to eighth preset energy values in this embodiment may be set by referring to the principles of the first to fourth preset energy values in the above embodiment.

The user may also combine or extend the multiple stages in the direct charging mode according to the actual requirement, and other combination manners and specific working principles of the multiple stages, control the duty ratio of the bridge arm switch, and setting the preset energy values of the multiple stages may refer to the description of the above embodiments, which is not repeated herein.

In another embodiment, in the direct charging mode, the first battery pack is connected in series between the battery positive electrode connection terminal and the battery middle connection terminal, the second battery pack is connected in series between the battery negative electrode connection terminal and the battery middle connection terminal, and the negative terminal of the charging module 30 and the second terminal of the middle switch S8 are connected to the first terminal of the three-phase winding.

Referring to fig. 1 to 6, in an embodiment, the direct charging mode includes:

In a third energy storage stage, the controller controls at least one upper bridge arm switch of the inverter to be conducted and controls other bridge arm switches of the inverter to be disconnected; and controlling the main positive switch S1 and the intermediate switch S8 to be respectively conducted and controlling the main negative switch S2 to be disconnected; and/or the number of the groups of groups,

In the third energy discharging stage, the controller controls the conduction of the lower bridge arm switch of the same phase winding as the upper bridge arm switch conducted by the inverter in the third energy storage stage, controls the disconnection of the rest bridge arm switches of the inverter, or controls the disconnection of all bridge arm switches of the inverter; and controlling the intermediate switch S8 and the main negative switch S2 to be conducted and controlling the main positive switch S1 to be disconnected; and/or the number of the groups of groups,

The controller controls the upper bridge arm switch of the inverter to be conducted in the third energy storage stage, and controls the other bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8 and the main negative switch S2 to be conducted and controlling the main positive switch S1 to be disconnected; and/or the number of the groups of groups,

It can be understood that, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are 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 and connected to the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 and the second end of any one phase of the three-phase winding, for example, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are connected to the first end of the three-phase winding, jitter can be prevented in the charging process; the control of the bridge arm switches can be more flexible, for example, when the negative end of the charging module 30 and the second end of the intermediate switch S8 are connected with the second end of any one phase of the three-phase winding, at most two upper bridge arm switches or lower bridge arm switches are controlled to be conducted, and in the embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be conducted, so that the integral voltage of the three-phase winding can be changed, and the energy storage and energy release speeds of the three-phase winding are changed; for example, the more bridge arm switches are conducted, the higher the voltage of the whole three-phase winding is, the faster the energy storage and release speeds of the three-phase winding are, and the specific quantity of the conducted bridge arm switches can be determined according to the actual voltage requirements of users. The battery connection circuit 10 outputs the power of the external device to the battery pack for charging, and simultaneously self-heating the battery pack can be realized in both connection modes, and other combination modes and specific working principles of the multiple stages, control of the bridge arm switch duty ratio, and setting of the preset energy values of the multiple stages can be referred to the description of the above embodiments, which is not repeated here.

In one embodiment, the controller is configured to control the charging and distributing module 30 to stop operating when receiving the control signal of the motor driving mode, so as to output the voltage output by the battery pack to the motor winding through the battery connection circuit 10 and heat the battery pack.

In this embodiment, when the controller receives the control signal of the motor driving mode, the controller may control the charging and distributing module 30 to stop working, for example, control the fast charging positive switch S4 and the fast charging negative switch S5 in the charging and distributing module 30 to be disconnected, so that the electrical connection between the energy conversion device and the external device is also disconnected, the voltage output by the external device is not received, the voltage is not output to the external device, and only the voltage output by the battery is output to the motor winding, and the motor winding drives the vehicle. Under the condition that energy transmission with external equipment is not needed, a motor driving mode can be entered, and the battery pack is repeatedly charged and discharged in the motor driving mode, so that self-heating of the battery pack is realized; therefore, the self-heating device is applicable to the situation that energy supplementing or rescue is not needed to be carried out with the outside, and the power output speed of the motor winding can be ensured to be normal through self-heating of the battery pack.

In the motor driving mode, the first battery pack is connected in series between the positive battery connection terminal and the middle battery connection terminal, the second battery pack is connected in series between the negative battery connection terminal and the middle battery connection terminal, and the negative terminal of the charging and distribution module 30 and the second terminal of the middle switch S8 are connected with the second terminal of any one phase of the three-phase windings;

Or the charging and distributing module further comprises a fast charging positive switch S4, a fast charging negative switch S5 and a boost switch S7, wherein the fast charging positive switch S4 is connected between the positive terminal of the charging and distributing module and external equipment, the fast charging negative switch S5 is connected between the negative terminal of the charging and distributing module and the negative terminal of the battery, the boost switch S7 is connected between the negative terminal of the charging and distributing module and the second terminal of any one phase of the three-phase winding or the first terminal of the three-phase winding, and the controller is used for controlling the fast charging positive switch S4, the fast charging negative switch S5 and the boost switch S7 to be disconnected when receiving a control signal of a motor driving mode. The motor driving mode in this case will be described with reference to fig. 1 to 6.

Referring to fig. 1 to 6, in an embodiment, the motor driving mode includes:

in a fifth energy storage stage, the controller controls the first upper bridge arm switch and the second lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the main positive switch S1 and the main negative switch S2 to be respectively turned on;

The first upper bridge arm switch is any one of two upper bridge arm switches corresponding to two phase windings which are not connected with the second end of the intermediate switch S8, and the second lower bridge arm switch is a lower bridge arm switch which is not in the same phase winding as the first upper bridge arm switch in the two phase windings which are not connected with the second end of the intermediate switch S8; and/or the number of the groups of groups,

In a fifth energy release stage, the controller controls the first lower bridge arm switch and the second lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls the second lower bridge arm switch to be conducted, and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8 and the main negative switch S2 to be conducted and controlling the main positive switch S1 to be disconnected;

In a sixth energy storage stage, the controller controls the first lower bridge arm switch and the second upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the main positive switch S1 and the main negative switch S2 to be respectively turned on;

In a sixth energy release stage, the controller controls the first upper bridge arm switch and the second upper bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls the second upper bridge arm switch to be conducted, and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8 and the main positive switch S1 to be conducted, and controlling the main positive switch S1 to be disconnected;

In this embodiment, when the controller controls the corresponding switch to be turned on or off in the five energy storage phases, the power supply voltage output by the first battery pack is transmitted to the motor winding to store energy and supply power, which may specifically be to store energy for one phase of the three-phase winding and supply power for two phases of the three-phase winding. When the controller controls the corresponding switch to be turned on or turned off in the fifth energy release stage, the power supply voltage output by the motor winding can be transmitted to the second battery pack for charging while the motor winding is powered. And when the controller controls the corresponding switch to be switched on or off in the sixth energy storage stage, the power supply voltage output by the second battery pack is transmitted to the motor winding to store energy and supply power, and specifically, the power supply voltage can store energy for one phase of the three-phase winding and supply power for two phases of the three-phase winding. When the controller controls the corresponding switch to be turned on or turned off in the sixth energy discharging stage, the power supply voltage output by the motor winding can be transmitted to the first battery pack for charging while the motor winding is powered.

In this embodiment, the first upper bridge arm switch, the second upper bridge arm switch, the first lower bridge arm switch and the second lower bridge arm switch are controlled to be turned on, and may be controlled to be turned on and off by a preset duty ratio, where the specific duty ratio may be set according to a charge-discharge relationship in different stages of the motor driving mode in this embodiment, and referring to the description of the upper voltage of the inductor in the above embodiment.

Further, in this embodiment, the fifth energy storage stage, the fifth energy release stage, the sixth energy storage stage and the sixth energy release stage in the motor driving mode may be combined to achieve different effects, for example, the fifth energy storage stage, the fifth energy release stage, the sixth energy storage stage and the sixth energy release stage are sequentially and cyclically executed, where the power supply voltage output by the first battery pack may be transmitted to the motor winding for energy storage and power supply in the fifth energy storage stage, and the third energy storage energy may be switched to the fifth energy release stage when reaching a ninth preset energy value; transmitting the power supply voltage output by the motor winding to the second battery pack for charging until the energy storage energy of the motor winding is lower than a tenth preset energy value, and switching to a sixth energy storage stage; transmitting the power supply voltage output by the second battery pack to the motor winding for energy storage and power supply, and switching to a sixth energy release stage when the third energy storage energy reaches an eleventh preset energy value; and transmitting the third energy storage energy of the motor winding to the first battery pack for charging, and switching to a fifth energy storage stage when the third energy storage energy of the motor winding is lower than a twelfth preset energy value. The first battery pack and the second battery pack can be charged and discharged repeatedly, so that the self-heating of the battery packs is realized while the motor winding is supplied with power. The battery pulse charge-discharge heating mode can be suitable for the working condition of the vehicle in the running process. The energy storage charging speed of the winding can be tested in advance, the energy discharge of the motor winding is controlled after the energy charging time of the winding reaches the preset time, and the energy charge of the motor winding is controlled after the energy discharge time of the winding reaches the preset time. The ninth preset energy value to the twelfth preset energy value in this embodiment may be set by referring to the principle of the first preset energy value to the fourth preset energy value in the above embodiment.

In this embodiment, the charging and distribution module includes the fast charging positive switch S4, the fast charging negative switch S5, and the boost switch S7, and when the energy conversion device works, the energy transmission paths of the energy conversion device and the external device can be controlled to be turned on or off by controlling the on or off of the fast charging positive switch S4 and the fast charging negative switch S5, so as to control the efficiency of the charging and discharging process. In the motor driving mode, energy transmission with external equipment is not required, so in this embodiment, the fast charge positive switch S4, the fast charge negative switch S5, and the boost switch S7 can be turned off.

The user may also combine or extend the multiple phases in the motor driving mode according to the actual requirement, and other combination manners and specific working principles of the multiple phases, control the duty ratio of the bridge arm switch, and setting the preset energy values of the multiple phases may refer to the description of the above embodiments, which is not repeated herein.

In another embodiment, in the motor driving mode, the first battery pack is connected in series between the battery positive electrode connection terminal and the battery middle connection terminal, the second battery pack is connected in series between the battery negative electrode connection terminal and the battery middle connection terminal, and the negative terminal of the charging and distributing module 30 and the second terminal of the middle switch S8 are connected with the first terminal of the three-phase winding;

Or the charging and distributing module further comprises a fast charging positive switch S4, a fast charging negative switch S5 and a boost switch S7, wherein the fast charging positive switch S4 is connected between the positive terminal of the charging and distributing module and external equipment, the fast charging negative switch S5 is connected between the negative terminal of the charging and distributing module and the negative terminal of the battery, the boost switch S7 is connected between the negative terminal of the charging and distributing module and the second terminal of any one phase of the three-phase winding or the first terminal of the three-phase winding, and the controller is used for controlling the fast charging positive switch S4, the fast charging negative switch S5 and the boost switch S7 to be disconnected when receiving a control signal of a motor driving mode.

Referring to fig. 1 to 6, in an embodiment, the motor driving mode includes:

In a sixth energy storage stage, the controller controls the first lower bridge arm switch and the second upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the main positive switch S1 and the main negative switch S2 to be respectively conducted

In this embodiment, when the controller controls the corresponding switch to be turned on or off in the fifth energy storage stage, the power supply voltage output by the first battery pack is transmitted to the motor winding to store energy and supply power, which may specifically be to store energy for one phase of the three-phase winding and supply power for two phases of the three-phase winding. When the controller controls the corresponding switch to be turned on or turned off in the fifth energy release stage, the power supply voltage output by the motor winding can be transmitted to the second battery pack for charging while the motor winding is powered. And when the controller controls the corresponding switch to be switched on or off in the sixth energy storage stage, the power supply voltage output by the second battery pack is transmitted to the motor winding to store energy and supply power, and specifically, the power supply voltage can store energy for one phase of the three-phase winding and supply power for two phases of the three-phase winding. When the controller controls the corresponding switch to be turned on or turned off in the sixth energy discharging stage, the power supply voltage output by the motor winding can be transmitted to the first battery pack for charging while the motor winding is powered.

It can be understood that, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are 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 and to be different from the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are connected to the second end of any one phase of the three-phase winding, for example, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are connected to the first end of the three-phase winding, jitter can be prevented from occurring in the charging process; the control of the bridge arm switches can be more flexible, for example, when the negative end of the charging module 30 and the second end of the intermediate switch S8 are connected with the second end of any one phase of the three-phase winding, at most two upper bridge arm switches or lower bridge arm switches are controlled to be conducted, and in the embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be conducted, so that the integral voltage of the three-phase winding can be changed, and the energy storage and energy release speeds of the three-phase winding are changed; for example, the more bridge arm switches are conducted, the higher the voltage of the whole three-phase winding is, the faster the energy storage and release speeds of the three-phase winding are, and the specific quantity of the conducted bridge arm switches can be determined according to the actual voltage requirements of users. The battery connection circuit 10 outputs the power of the external device to the battery pack for charging, and simultaneously self-heating the battery pack can be realized in both connection modes, and other combination modes and specific working principles of the multiple stages, control of the bridge arm switch duty ratio, and setting of the preset energy values of the multiple stages can be referred to the description of the above embodiments, which is not repeated here.

In an embodiment, the controller is configured to control the charging module 30 to output a power source of an external device to the battery pack through the battery connection circuit 10 to charge the battery pack and heat the battery pack when receiving the control signal of the boost charging mode.

In this embodiment, when the battery pack of the vehicle needs to be charged by an external device, the vehicle may enter a boost charging mode, and the external device may be other electric vehicles, and when the battery is exhausted during running, rescue power supply may be performed by the vehicle in this embodiment; the controller can boost the power of the external device by controlling the charging and distribution module 30, the inverter and the motor winding when receiving the control signal of the boost charging mode, and charge the battery pack, and repeatedly charge and discharge the battery pack while charging the battery pack to realize heating. The voltage value to be boosted can be determined by the relationship between the output voltage of the external device and the requested charging voltage of the battery pack of the vehicle. So can be applicable to the external equipment and carry out the condition of mending the ability, ensure user's trip to through the self-heating to group battery, can also accelerate charge speed.

In an embodiment, the controller is configured to control the charging and distributing module 30 to output the power of the battery pack to the external device for charging and heat the battery pack when receiving the control signal of the buck discharging mode.

In this embodiment, when the battery of the vehicle needs to discharge the external device, the vehicle may enter a step-down discharge mode, and the external device may be another electric vehicle, and when the battery is depleted during the driving process, the vehicle in this embodiment may perform rescue power supply. The controller can reduce the voltage of the power supply of the battery pack by controlling the charging and distributing module 30, the inverter and the motor winding when receiving the control signal of the voltage reducing and discharging mode, and then supply power to the external device, and repeatedly charge and discharge the battery pack to heat the battery pack while supplying power to the external device. The voltage value to be stepped down can be determined by the relationship between the output voltage of the external device and the requested charging voltage of the battery pack of the vehicle. Therefore, the battery pack can be suitable for the situation that external equipment is not powered and needs to be charged, the use scene of the vehicle is increased, and the discharging speed of the external equipment can be accelerated through self-heating of the battery pack.

Further, in an embodiment, the first battery pack is connected in series between the positive electrode connection end of the battery and the middle connection end of the battery, the second battery pack is connected in series between the negative electrode connection end of the battery and the middle connection end of the battery, the charging module 30 includes a fast positive switch S4, a fast negative switch S5, a boost switch S7, a first capacitor C1 and a capacitor switch S6, the fast positive switch S4 is connected between the positive electrode end of the charging module 30 and an external device, the fast negative switch S5 is connected between the negative electrode end of the charging module 30 and the negative electrode connection end of the battery, the boost switch S7 is connected between the negative electrode end of the charging module 30 and the second end of any one of the three-phase windings or the first end of the three-phase winding, the capacitor switch S6 and the first capacitor C1 are sequentially connected in series between the fast positive switch S4 and the fast negative switch S5, and the second end of any one of the three-phase windings S8 of the charging module 30 is connected between the negative electrode end of the charging module and the second end of any one of the three-phase windings. The step-up charge mode and the step-down discharge mode in this case are described with reference to fig. 1 to 6.

Referring to fig. 1 to 6, in an embodiment, the boost charge mode and the buck discharge mode include:

a seventh energy storage stage, wherein the controller controls the first upper bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the fast charge positive switch S4, the boost switch S7 and the main positive switch S1 to be turned on, and controlling the fast charge negative switch S5, the capacitor switch S6 and the main negative switch S2 to be turned off;

A seventh energy release stage, wherein the controller controls the first lower bridge arm switch of the inverter to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the fast charge positive switch S4, the boost switch S7 and the main negative switch S2 to be turned on, and controlling the fast charge negative switch S5, the capacitor switch S6 and the main positive switch S1 to be turned off;

In an eighth energy storage stage, the controller controls the first lower bridge arm switch of the inverter to be conducted and controls the rest bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the fast charge positive switch S4, the boost switch S7 and the main negative switch S2 to be turned on, and controlling the fast charge negative switch S5, the capacitor switch S6 and the main positive switch S1 to be turned off;

In an eighth energy discharging stage, the controller controls the first upper bridge arm switch of the inverter to be conducted in the seventh energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the fast charge positive switch S4, the boost switch S7 and the main positive switch S1 to be on, and controlling the fast charge negative switch S5, the capacitor switch S6 and the main positive switch S1 to be off.

In this embodiment, when the controller controls the corresponding switch to be turned on or off in the seventh energy storage stage, the power supply voltage output by the first battery pack may be transmitted to the motor winding to store energy while the external device is being supplemented with energy or the external device is being rescued. When the controller controls the corresponding switch to be turned on or off in the seventh energy discharging stage, the fourth energy storage energy of the motor winding can be transmitted to the second battery pack for charging while energy is supplemented from external equipment or rescue is carried out on the external equipment. When the controller controls the corresponding switch to be turned on or off in the eighth energy storage stage, the power supply voltage output by the second battery pack can be transmitted to the motor winding to store energy while energy is supplemented from external equipment or rescue is carried out on the external equipment. When the controller controls the corresponding switch to be turned on or off in the eighth energy discharging stage, the fourth energy storage energy of the motor winding can be transmitted to the first battery pack for charging while energy is supplemented from external equipment or rescue is carried out on the external equipment.

In the embodiment, the first upper bridge arm switch, the second upper bridge arm switch, the first lower bridge arm switch and the second lower bridge arm switch are controlled to be turned on, and may be controlled to be turned on and off by a preset duty ratio, where the specific duty ratio may be set according to a charging-discharging relationship in the embodiment at different stages of the boost charging mode and the buck discharging mode, and referring to the description of the upper voltage of the inductor in the embodiment.

Further, in this embodiment, the seventh energy storage stage, the seventh energy release stage, the eighth energy storage stage and the eighth energy release stage in the boost charging mode and the buck discharging mode may be combined to achieve different effects, for example, the seventh energy storage stage, the seventh energy release stage, the eighth energy storage stage and the eighth energy release stage may be sequentially and cyclically executed, and the power supply voltage output by the first battery pack may be transmitted to the motor winding for energy storage in the seventh energy storage stage, and may be switched to the seventh energy release stage when the fourth energy storage energy reaches the thirteenth preset energy value; transmitting fourth energy storage energy of the motor winding to the second battery pack for charging until the voltage of the motor winding is lower than a fourteenth preset energy value, and switching to an eighth energy storage stage; transmitting the power supply voltage output by the second battery pack to the motor winding for energy storage, and switching to an eighth energy release stage when the fourth energy storage energy reaches a fifteenth preset energy value; and transmitting fourth energy storage energy of the motor winding to the first battery pack for charging, and switching to a seventh energy storage stage until the fourth energy storage energy of the motor winding is lower than a sixteenth preset energy value. The first battery pack and the second battery pack can be charged and discharged repeatedly, so that the self-heating of the battery packs is realized while the motor winding is supplied with power. The boost charge mode may be suitable for a case where the vehicle requires external equipment to be charged, and the buck discharge mode may be suitable for a case where the vehicle discharges to the external equipment. The energy storage charging speed of the winding can be tested in advance, the energy discharge of the motor winding is controlled after the energy charging time of the winding reaches the preset time, and the energy charge of the motor winding is controlled after the energy discharge time of the winding reaches the preset time. And the thirteenth to sixteenth preset energy values in the present embodiment may be set with reference to the principles of the first to fourth preset energy values in the above-described embodiments.

The user may also combine or extend multiple stages in the boost charging mode or the buck discharging mode according to the actual requirement, and other combination modes and specific working principles of the multiple stages, control the duty ratio of the bridge arm switch, and setting the preset energy values of the multiple stages may refer to the description of the above embodiments, which is not repeated herein.

In another embodiment, in the boost charging mode or the buck discharging mode, the first battery pack is connected in series between the battery positive electrode connection terminal and the battery middle connection terminal, the second battery pack is connected in series between the battery negative electrode connection terminal and the battery middle connection terminal, the charging module 30 includes a fast positive switch S4, a fast negative switch S5, a boost switch S7, a first capacitor C1 and a capacitor switch S6, the fast positive switch S4 is connected between the positive terminal and an external device of the charging module 30, the fast negative switch S5 is connected between the negative terminal and the battery negative electrode connection terminal of the charging module 30, the boost switch S7 is connected between the negative terminal of the charging module 30 and the second terminal of any one of the three-phase windings or the first terminal of the three-phase winding, the capacitor switch S6 and the first capacitor C1 are connected in series between the fast positive switch S4 and the fast negative switch S5, and the first capacitor C1 are connected in turn between the negative terminal and the first terminal of the three-phase winding 8.

A seventh energy storage stage, wherein the controller controls at least one upper bridge arm switch of the inverter to be conducted and controls other bridge arm switches of the inverter to be disconnected; the intermediate switch S8, the fast charge positive switch S4, the capacitor switch S6, the boost switch S7 and the main positive switch S1 are controlled to be conducted, and the fast charge negative switch S5 and the main negative switch S2 are controlled to be disconnected; and/or the number of the groups of groups,

A seventh energy release stage, wherein the controller controls the conduction of the lower bridge arm switch of the same phase winding as the upper bridge arm switch conducted by the inverter in the seventh energy storage stage, controls the disconnection of the rest bridge arm switches of the inverter, or controls the disconnection of all bridge arm switches of the inverter; and controlling the intermediate switch S8, the fast charge positive switch S4, the boost switch S7 and the main negative switch S2 to be turned on, and controlling the fast charge negative switch S5, the capacitor switch S6 and the main positive switch S1 to be turned off; and/or the number of the groups of groups,

In an eighth energy storage stage, the controller controls the conduction of a lower bridge arm switch of the same phase winding as an upper bridge arm switch conducted by the inverter in a seventh energy storage stage, and controls the disconnection of the rest bridge arm switches of the inverter; and controlling the intermediate switch S8, the fast charge positive switch S4 and the main negative switch S2 to be turned on, and controlling the fast charge negative switch S5, the boost switch S7, the capacitor switch S6 and the main positive switch S1 to be turned off; and/or the number of the groups of groups,

An eighth energy discharging stage, wherein the controller controls the upper bridge arm switch which is conducted with the inverter in the seventh energy storage stage to be conducted, controls the rest bridge arm switches of the inverter to be disconnected, or controls all bridge arm switches of the inverter to be disconnected; and controlling the intermediate switch S8, the fast charge positive switch S4, the boost switch S7 and the main positive switch S1 to be on, and controlling the fast charge negative switch S5, the capacitor switch S6 and the main positive switch S1 to be off.

It can be understood that, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are 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 and to be different from the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are connected to the second end of any one phase of the three-phase winding, for example, in the case where the negative end of the charging and distributing module 30 and the second end of the intermediate switch S8 are connected to the first end of the three-phase winding, jitter can be prevented from occurring in the charging process; the control of the bridge arm switches can be more flexible, for example, when the negative end of the charging module 30 and the second end of the intermediate switch S8 are connected with the second end of any one phase of the three-phase winding, at most two upper bridge arm switches or lower bridge arm switches are controlled to be conducted, and in the embodiment, at most three upper bridge arm switches or lower bridge arm switches can be controlled to be conducted, so that the integral voltage of the three-phase winding can be changed, and the energy storage and energy release speeds of the three-phase winding are changed; for example, the more bridge arm switches are conducted, the higher the voltage of the whole three-phase winding is, the faster the energy storage and release speeds of the three-phase winding are, and the specific quantity of the conducted bridge arm switches can be determined according to the actual voltage requirements of users. The battery pack can be self-heated while being charged or discharged by external equipment in the two connection modes, other combination modes and specific working principles of the multiple stages, control of the bridge arm switch duty ratio, and setting of preset energy values of the multiple stages can be referred to the description of the above embodiments, and are not repeated here.

Referring to fig. 10, the charging and distributing module 30 further includes a first inductor L1, and the first inductor L1 is connected in series between the second end of one phase of the three-phase winding or the first end of the three-phase winding and the negative terminal of the charging and distributing module 30.

In this embodiment, the first inductor L1 may also perform the functions of energy storage and energy release, and may store energy together with the first capacitor C1 in the charging and distribution module 30 to increase the energy of the stored energy. Therefore, the charging power of the energy conversion device in the boosting charging mode and the discharging power of the step-down discharging mode can be improved, and the heating power of the battery pulse charging-discharging heating mode can be improved.

Referring to fig. 1 to 12, in an embodiment, the energy conversion apparatus further includes a precharge switch S3, a first resistor R1, a main fuse F1, and a shunt RS; the first end of the main fuse F1 and the first end of the shunt RS are connected with the first interface, the second end of the main fuse F1, the first end of the main positive switch S1 and the first end of the first resistor R1 are connected, the second end of the first resistor R1 is connected with the first end of the pre-charging switch S3, the second end of the first switch module is connected with the second end of the pre-charging switch S3, and the second end of the shunt RS is connected with the first end of the first switch module.

In this embodiment, in consideration of the problems of charging safety, stability, and the like in the energy conversion device, the energy conversion device may further be provided with devices such as a precharge switch S3, a first resistor R1, a main fuse F1, and a shunt RS; the precharge circuit is formed by controlling the precharge switch S3 to precharge the battery, so that the stability of charging is ensured. The first resistor R1 may then be current limited. The main fuse F1 can be disconnected when the current in the circuit is overlarge, so that the circuit safety is ensured. The current divider RS can detect the current in the circuit and determine whether the current is over-current or under-current. The specific connection relation of the above devices in this example may be referred to, and this specification is not limited thereto.

Referring to fig. 1 to 11, in an embodiment, the energy conversion device further includes:

The dc charging stand 40, the charging and distribution module 30 and the battery connection circuit 10 are connected to an external device through the dc charging stand 40.

In this embodiment, the dc charging stand 40 may be a socket, so that the energy conversion device may be connected to external devices such as a charging pile or other vehicles, and a specific socket model may be selected according to the user's requirements.

Referring to fig. 11, in an embodiment, the positive terminal of the charging module 30 is connected to the second terminal of the main fuse F1, and the negative terminal of the charging module 30 is connected to the second terminal of the shunt RS.

In this embodiment, the positive terminal of the charging and distribution module 30 is connected to the second terminal of the main fuse F1, and the negative terminal of the charging and distribution module 30 is connected to the second terminal of the shunt RS, so that the charging and distribution module 30 and the battery connection circuit 10 can share the main fuse F1 and the shunt RS, thereby protecting the circuit and collecting current.

In the charge-discharge loop scheme of the energy conversion device in the above embodiment, the positive electrode and the negative electrode of the battery pack are isolated from the output interface of the battery pack without a switch, which can lead to continuous electrification of the output interface of the battery pack.

To solve this problem, the present invention provides another solution for an energy conversion device. In one embodiment, the capacitive switch S6 is connected to the second terminal of the main positive switch S1. Moving the fast positive charge switch S4 and the fast negative charge switch S5 into the battery connecting circuit 10, wherein the first end of the fast positive charge switch S4 is connected with the positive electrode of the battery pack, and the second end of the fast positive charge switch S4 is connected with external equipment; the first end of the fast charge negative switch S5 is connected with the negative electrode of the battery pack, and the second end of the fast charge negative switch S5 is connected with external equipment; therefore, switches are arranged between the positive electrode and the negative electrode of the battery pack and the output interface of the battery connecting circuit 10, and the positive electrode output port and the negative electrode output port of the battery pack can be prevented from being electrified continuously in the working process of the energy conversion device through the isolation of the switches. The specific circuit structure may refer to fig. 7 or fig. 8. The energy conversion device in the present embodiment is also capable of heating the battery pack in the motor drive mode, the direct charge mode, the boost charge mode, the buck discharge mode, and the battery pulse charge-discharge heating mode.

To solve this problem, the invention also provides another scheme of the energy conversion device. In an embodiment, the fast positive charge switch S4 and the fast negative charge switch S5 are moved into the battery connection circuit 10, specifically, a first end of the fast positive charge switch S4 is connected with a positive electrode of the battery pack, and a second end of the fast positive charge switch S4 is connected with an external device; the first end of the fast charge negative switch S5 is connected with the negative electrode of the battery pack, and the second end of the fast charge negative switch S5 is connected with the first end of the capacitor switch S6 and external equipment; the arrangement can also lead the positive electrode and the negative electrode of the battery pack to be provided with switches between the positive electrode and the negative electrode of the battery pack and the output interface of the battery connecting circuit 10, and the positive electrode output port and the negative electrode output port of the battery pack can be prevented from being electrified continuously in the working process of the energy conversion device through the isolation of the switches. The specific circuit structure may refer to fig. 9 or fig. 10. The energy conversion device in the present embodiment is also capable of heating the battery pack in the motor drive mode, the direct charge mode, the boost charge mode, the buck discharge mode, and the battery pulse charge-discharge heating mode.

In one embodiment, the present invention provides another energy conversion device. In this embodiment, a first end of the boost switch S7 is connected to the three-phase winding center point of the motor winding, and a second end of the boost switch S7 is connected to a second end of the fast charge positive switch S4. The first end of the capacitive switch S6 is connected to the first capacitor C1, and the second end of the capacitive switch S6 is connected to the first end of the fast charge negative switch S5. Specific circuit configurations may be referred to in fig. 12. The energy conversion device in the present embodiment is also capable of heating the battery pack in the motor drive mode, the direct charge mode, the boost charge mode, the buck discharge mode, and the battery pulse charge-discharge heating mode.

In one embodiment, the invention also provides another energy conversion device scheme. The charging and distributing module further comprises a boost switch S7, a first end of the boost switch S7 is connected with a second end of any one phase of the three-phase winding or with a first end of the three-phase winding, and a second end of the boost switch S7 is connected with a negative electrode end of the charging and distributing module 30. In the case where the second terminal of the intermediate switch S8 is connected to the first terminal of the boost switch S7, the operation mode includes at least one of a motor driving mode for supplying power to the motor from the battery, a direct charging mode or a boost charging mode for charging the battery from the external device, a buck discharging mode for charging the battery from the external device, and a battery pulse charge-discharge heating mode for heating the battery.

And in the case where the second terminal of the intermediate switch is connected to the second terminal of the boost switch, the operation mode includes at least one of a motor driving mode for supplying power to the motor from the battery, a boost charging mode for charging the battery from the external device, a buck discharging mode for charging the battery from the external device, and a battery pulse charge-discharge heating mode for heating the battery.

In this embodiment, the first end of the intermediate switch S8 is connected to the middle connection end of the battery, and the second end of the intermediate switch S8 is connected to the first end or the second end of the boost switch S7 through a conductive strip or a conductive wire harness, while a second fast charge negative switch S9 is added for isolation, so as to prevent the charging port from being negatively charged during the battery pulse charge-discharge heating mode. Specific circuit configurations can be seen with reference to fig. 13. When the second end of the intermediate switch S8 is connected to the first end of the boost switch S7, the energy conversion device in this embodiment can heat the battery pack in the motor driving mode, the boost charging mode, the direct charging mode, the buck discharging mode, and the battery pulse charge-discharge heating mode; when the second terminal of the intermediate switch S8 is connected to the second terminal of the boost switch S7, the battery pack can be heated only in the motor driving mode, the boost charging mode, the buck discharging mode, and the battery pulse charge-discharge heating mode.

In one embodiment, the present invention provides another energy conversion device. In this embodiment, the first end of the intermediate switch S8 is connected to the middle connection end of the battery, and the second end of the intermediate switch S8 is connected to the outside of the boost switch S7 through a conductive strip or a conductive wire harness, while the second fast charge negative switch S9 is cancelled, and the charging port is negatively charged with a monopole in the battery pulse charge-discharge heating mode. The specific circuit configuration can be seen with reference to fig. 14. The energy conversion device in the embodiment can heat the battery pack in the motor driving mode, the step-up charging mode, the step-down discharging mode, and the battery pulse charge-discharge heating mode.

The invention also provides a vehicle which comprises the battery module and the energy conversion device, wherein the positive electrode of the battery module is connected with the positive electrode connecting end of the battery in the energy conversion device, and the negative electrode of the battery module is connected with the negative electrode connecting end of the battery in the energy conversion device. The specific structure of the energy conversion device refers to the above embodiments, and since the vehicle adopts all the technical solutions of all the embodiments, the energy conversion device has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. An energy conversion device, comprising:

2. The energy conversion device of claim 1, wherein the controller is configured to control the battery connection circuit to heat the battery pack by the charging module and the motor module upon receiving a control signal of the battery pulse charge-discharge heating mode.

3. The energy conversion device according to claim 2, wherein the first battery pack is connected in series between the battery positive electrode connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative electrode connection terminal and the battery intermediate connection terminal, and the negative electrode terminal of the charging module and the second terminal of the intermediate switch are connected with the second terminal of any one phase of the three-phase winding;

4. The energy conversion device of claim 3, wherein the battery pulse charge-discharge heating mode comprises:

5. The energy conversion device of claim 2, wherein the first battery pack is connected in series between the battery positive connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative connection terminal and the battery intermediate connection terminal, and the negative terminal of the charging module and the second terminal of the intermediate switch are connected with the first terminal of the three-phase winding;

6. The energy conversion device of claim 5, wherein the battery pulse charge-discharge heating mode comprises:

7. The energy conversion device of claim 1, wherein the controller is further configured to control the charging module to output a power source of an external device to the battery pack through the battery connection circuit to charge and heat the battery pack when receiving the control signal of the direct charging mode.

8. The energy conversion device of claim 7, wherein the first battery pack is connected in series between the battery positive connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative connection terminal and the battery intermediate connection terminal, and the negative terminal of the charging module and the second terminal of the intermediate switch are connected to the second terminal of any one of the three-phase windings.

9. The energy conversion device of claim 8, wherein the direct charge mode comprises:

10. The energy conversion device of claim 7, wherein the first battery pack is connected in series between the battery positive connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative connection terminal and the battery intermediate connection terminal, and the negative terminal of the charging module and the second terminal of the intermediate switch are connected with the first terminal of the three-phase winding.

11. The energy conversion device of claim 10, wherein the direct charge mode comprises:

12. The energy conversion device of claim 1, wherein the controller is configured to control the charging and power distribution module to stop operating when receiving the control signal of the motor driving mode, to output the voltage output from the battery pack to the motor winding through the battery connection circuit, and to heat the battery pack.

13. The energy conversion device of claim 12, wherein the first battery pack is connected in series between the battery positive connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative connection terminal and the battery intermediate connection terminal, and the negative terminal of the charging module and the second terminal of the intermediate switch are connected to the second terminal of any one of the three-phase windings;

14. The energy conversion device of claim 13, wherein the motor drive mode comprises:

15. The energy conversion device of claim 12, wherein the first battery pack is connected in series between the battery positive connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative connection terminal and the battery intermediate connection terminal, and the negative terminal of the charging module and the second terminal of the intermediate switch are connected with the first terminal of the three-phase winding;

16. The energy conversion device of claim 15, wherein the motor drive mode comprises:

17. The energy conversion device according to claim 1, wherein the controller is configured to control the charging module to output a power source of an external device to the battery pack through the battery connection circuit to charge and heat the battery pack when receiving the control signal of the boost charging mode.

18. The energy conversion device of claim 1, wherein the controller is configured to control the charging and distribution module to output a power supply of the battery pack to an external device for charging and to heat the battery pack when receiving the control signal of the buck discharging mode.

19. The energy conversion device of any one of claims 17 or 18, wherein the first battery pack is connected in series between the battery positive connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative connection terminal and the battery intermediate connection terminal, the charge distribution module includes a fast charge positive switch, a fast charge negative switch, a boost switch, a first capacitor, and a capacitor switch, the fast charge positive switch is connected between the positive terminal of the charge distribution module and an external device, the fast charge negative switch is connected between the negative terminal of the charge distribution module and the battery negative connection terminal, the boost switch is connected between the negative terminal of the charge distribution module and the second terminal of any one of the three-phase windings or with the first terminal of the three-phase windings, the capacitor switch and the first capacitor are connected in series in sequence between the fast charge positive switch and the fast charge negative switch, and the second terminal of the intermediate switch is connected with the second terminal of any one of the three-phase windings.

20. The energy conversion device of claim 19, wherein the boost charging mode and the buck discharging mode comprise:

21. The energy conversion device of any one of claims 17 or 18, wherein the first battery pack is connected in series between the battery positive connection terminal and the battery intermediate connection terminal, the second battery pack is connected in series between the battery negative connection terminal and the battery intermediate connection terminal, the charge power module includes a fast charge positive switch, a fast charge negative switch, a boost switch, a first capacitor, and a capacitor switch, the fast charge positive switch is connected between the positive terminal of the charge power module and an external device, the fast charge negative switch is connected between the negative terminal of the charge power module and the battery negative connection terminal, the boost switch is connected between the negative terminal of the charge power module and the second terminal of any one of the three-phase windings or the first capacitor, the capacitor switch and the first capacitor are connected in series in sequence between the fast charge positive switch and the fast charge negative switch, and the second terminal of the intermediate switch is connected with the first terminal of the three-phase windings.

22. The energy conversion device of claim 21, wherein the boost charging mode and the buck discharging mode comprise:

23. The energy conversion device of claim 1, wherein the charging and distribution module further comprises a boost switch, a first end of the boost switch being connected to a second end of any one of the three-phase windings or to a first end of the three-phase windings, a second end of the boost switch being connected to a negative terminal of the charging and distribution module, a second end of the intermediate switch being connected to a first end of the boost switch;

24. The energy conversion device of claim 1, wherein the charging and distribution module further comprises a boost switch, a first end of the boost switch being connected to a second end of any one of the three-phase windings or to a first end of the three-phase windings, a second end of the boost switch being connected to a negative terminal of the charging and distribution module, a second end of the intermediate switch being connected to a second end of the boost switch;

25. The energy conversion device of claim 1, wherein the charging and distribution module further comprises a first inductor connected in series between a second end of one of the three-phase windings or the first end of the three-phase winding and a negative end of the charging and distribution module.

26. The energy conversion device of claim 1, wherein the battery connection circuit comprises a fast charge positive switch and a fast charge negative switch, a first end of the fast charge positive switch being connected to a positive pole of the first battery pack, a second end of the fast charge positive switch being for connection to an external device, a first end of the fast charge negative switch being connected to a negative pole of the second battery pack, a second end of the fast charge negative switch being for connection to an external device.

27. The energy conversion device of claim 1, wherein the battery connection circuit comprises a fast charge positive switch and a fast charge negative switch, the charge power module comprises a capacitive switch, a first end of the fast charge positive switch is connected to the positive pole of the first battery pack, a second end of the fast charge positive switch is used to connect to an external device, a first end of the fast charge negative switch is connected to the negative pole of the second battery pack, and a second end of the fast charge negative switch and a first end of the capacitive switch are used to connect to an external device.

28. The energy conversion device of any of claims 1-27, further comprising a precharge switch, a first resistor, a main fuse, and a shunt; the first end of the main fuse and the first end of the shunt are connected with the first interface, the second end of the main fuse, the first end of the main positive switch and the first end of the first resistor are connected, the second end of the first resistor is connected with the first end of the pre-charging switch, the second end of the first switch module is connected with the second end of the pre-charging switch, and the second end of the shunt is connected with the first end of the first switch module.

29. A vehicle comprising a battery module and an energy conversion device according to any one of claims 1 to 28, wherein the positive electrode of the battery module is connected to the positive electrode connection terminal of the battery in the energy conversion device, and the negative electrode of the battery module is connected to the negative electrode connection terminal of the battery in the energy conversion device.