Voltage-boosting and current-boosting heating system of common positive bus electric drive system and electric automobile

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a common positive bus electric drive system boosting and current increasing heating system which comprises a power battery and a charging port. The driving system is arranged between the power battery and the charging port, the positive electrode of the power battery, the positive electrode of the driving system and the positive electrode of the charging port are all connected with the positive electrode bus, the driving system boosts charging voltage and boosts charging current, and the driving system achieves self-heating of the power battery through pulse current; the switch assembly comprises a plurality of switches, the plurality of switches are arranged on power supply links among the power battery, the driving system and the charging port, the power battery is provided with a self-heating control switch, and the on-off of at least one power supply link is controlled through the switch assembly. And controlling the power battery to enter at least one of a direct fast charging mode, a boosting charging mode, a current boosting charging mode and a battery self-heating mode. Therefore, the problem that the electric vehicle cannot adapt to the multi-voltage charging pile in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a common positive bus electric drive system boosting and current increasing heating system and an electric vehicle. Background Art

[0002] With the popularity of electric vehicles, the compatibility requirements of vehicles with multiple types of charging infrastructure are increasing. To meet this demand, high-voltage architectures such as Figure 1 As shown, it includes a main positive relay K2, a main negative relay K4, a pre-charge relay K3, fast charge relays K6 and K7, a pre-charge resistor R1, inverters Q1-Q6, and a bus capacitor C1.

[0003] However, DC charging piles have voltage levels of 500V, 750V, and 1000V. When the voltage platform of the power battery of an electric vehicle is in the range of 500 to 750V or 750V to 1000V, there is a situation where a low-voltage charging pile cannot charge a high-voltage vehicle, or when a high-voltage pile charges a low-voltage vehicle, the charging current cannot reach the maximum due to the limitations of the charging interface. Summary of the Invention

[0004] The present application provides a common positive bus electric drive system boosting and current increasing heating system and an electric vehicle to solve the problem that electric vehicles cannot adapt to multi-voltage charging piles in related technologies.

[0005] The first aspect of the present application provides a common positive bus electric drive system boost and current heating system, including: a power battery and a charging port; a drive system arranged between the power battery and the charging port, wherein the positive pole of the power battery, the drive system and the positive pole of the charging port are all connected to the positive bus, the drive system boosts the charging voltage and the charging current, and the drive system uses pulse current to achieve self-heating of the power battery; a switch component, wherein the switch component includes a plurality of switches, and the plurality of switches are arranged on the power supply link between the power battery, the drive system and the charging port, and the power battery is provided with a self-heating control switch, and the on and off of at least one power supply link is controlled by the switch component to control the power battery to enter at least one mode of direct fast charging mode, boost charging mode, current increasing charging mode and battery self-heating mode.

[0006] Optionally, in one embodiment of the present application, the drive system includes an inverter and a motor, wherein one end of the motor is connected to the inverter, and the other end of the motor is connected to one end of the inductor, and the inverter is used to increase voltage and current.

[0007] Optionally, in one embodiment of the present application, the inverter includes a plurality of power devices, and the plurality of power devices cooperate with each other to achieve voltage boosting and current boosting.

[0008] Optionally, in one embodiment of the present application, a first capacitor and a second capacitor, wherein the first capacitor is a bus capacitor of the inverter, and the second capacitor is used for charging filtering.

[0009] Optionally, in one embodiment of the present application, the switch assembly includes first to ninth switches, wherein the negative pole of the power battery is connected to one end of the first switch and the fourth switch, the other end of the first switch is connected to one end of the second capacitor, one end of the fifth switch, one end of the eighth switch and one end of the ninth switch, the other end of the fifth switch is connected to the other end of the inductor, the other end of the eighth switch is connected to the single cell of the power battery, the other end of the ninth switch is connected to the negative pole of the charging port, the other end of the fourth switch is respectively connected to one end of the first capacitor and the seventh switch, the other end of the seventh switch is connected to the negative pole of the charging port, the positive pole of the power battery is respectively connected to one end of the second switch and one end of the third switch, the other end of the third switch is connected to one end of the resistor, the other end of the second switch is respectively connected to the other end of the resistor, the other end of the first capacitor, the other end of the second capacitor and one end of the sixth switch, and the other end of the sixth switch is connected to the positive pole of the charging port.

[0010] Optionally, in one embodiment of the present application, if the second to seventh switches are closed and the first switch, the fifth switch, the eighth switch and the ninth switch are disconnected, the power battery enters the direct fast charging mode; if the second to sixth switches and the ninth switch are closed and the first switch, the sixth switch and the ninth switch are disconnected, the power battery enters the boost charging mode; if the first to third switches and the fifth to seventh switches are closed and the fourth switch, the eighth switch and the ninth switch are disconnected, the power battery enters the boost charging mode; if the second to fourth switches and the eighth switch are closed and the first switch, the fifth to seventh switches and the ninth switch are disconnected, the power battery enters the battery self-heating mode.

[0011] Optionally, in one embodiment of the present application, the first to ninth switches are relays.

[0012] A second aspect of the present application provides an electric vehicle, comprising a common positive bus electric drive system voltage and current boosting and heating system according to the first aspect.

[0013] Therefore, this application has the following beneficial effects:

[0014] By setting up a drive system between the power battery and the charging port, the charging voltage and current can be increased, significantly improving the charging efficiency. At the same time, the drive system can also self-heat the power battery through pulse current, so that the battery can quickly reach a suitable operating temperature even in a low-temperature environment, improving the charging performance and environmental adaptability. The positive poles of the power battery, drive system and charging port are all connected to the positive bus. The system also has a switch assembly composed of multiple switches, which can flexibly control the on and off of the power supply link according to demand, so that the power battery can switch between direct fast charging mode, boost charging mode, boost charging mode and battery self-heating mode to meet the needs of use in different scenarios. This solves the problem of electric vehicles being unable to adapt to multi-voltage charging piles in related technologies.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram of a high-voltage architecture of the related technology;

[0018] Figure 2 Schematic diagram of the structure of a voltage-boosting and current-boosting heating system for a common positive bus electric drive system according to an embodiment of the present application;

[0019] Figure 3 Schematic diagram of a voltage- and current-boosting heating system for a common positive bus electric drive system according to an embodiment of the present application;

[0020] Figure 4 This is a circuit diagram of a direct fast charging mode according to an embodiment of the present application;

[0021] Figure 5 1 is a main circuit diagram of a boost charging mode according to an embodiment of the present application;

[0022] Figure 6 Schematic diagram of voltage conversion in boost charging mode according to an embodiment of the present application;

[0023] Figure 7 Schematic diagram of ground voltage conversion according to an embodiment of the present application;

[0024] Figure 8 Schematic diagram of energy storage in boost charging mode according to an embodiment of the present application;

[0025] Figure 9 A schematic diagram of voltage increase in boost charging mode according to an embodiment of the present application;

[0026] Figure 10 This is a main circuit diagram of the boost charging mode according to an embodiment of the present application;

[0027] Figure 11 Schematic diagram of energy storage in a boost charging mode according to an embodiment of the present application;

[0028] Figure 12 Schematic diagram of current increase in boost charging mode according to an embodiment of the present application;

[0029] Figure 13 This is a main circuit diagram of a battery heating mode according to an embodiment of the present application;

[0030] Figure 14 Schematic diagram of battery energy storage in the upper half module in battery heating mode according to an embodiment of the present application;

[0031] Figure 15 Schematic diagram of charging a half-module battery in battery heating mode according to an embodiment of the present application;

[0032] Figure 16 Schematic diagram of battery heating mode energy storage according to an embodiment of the present application;

[0033] Figure 17 Schematic diagram of self-heating in battery heating mode according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0035] The following describes the common positive busbar electric drive system boost and current heating system and electric vehicle of the embodiment of the present application with reference to the accompanying drawings. In response to the problems mentioned in the above background technology, the present application provides a common positive busbar electric drive system boost and current heating system. In this system, by setting a drive system between the power battery and the charging port, the charging voltage is boosted and the charging current is increased, which significantly improves the charging efficiency; at the same time, the drive system can also self-heat the power battery through pulse current, so that the battery can quickly reach a suitable operating temperature even in a low temperature environment, thereby improving the charging performance and environmental adaptability; the positive poles of the power battery, the drive system and the charging port are all connected to the positive busbar. The system is also provided with a switch assembly composed of multiple switches, which can flexibly control the on and off of the power supply link according to demand, so that the power battery can switch between direct fast charging mode, boost charging mode, current increasing charging mode and battery self-heating mode to meet the use requirements in different scenarios. Thus, the problem that electric vehicles in the related art cannot adapt to multi-voltage charging piles is solved.

[0036] Specifically, Figure 2 A block diagram of a common positive bus electric drive system boosting and current heating system provided in an embodiment of the present application.

[0037] like Figure 2 As shown, the common positive bus electric drive system boost and current heating system includes: a power battery 100, a drive system 200, a charging port 300 and a switch assembly 400.

[0038] Among them, the positive pole of the power battery 100, the positive pole of the drive system 200 and the charging port 300 are all connected to the positive bus, the drive system 200 boosts the charging voltage and the charging current, and the drive system 200 uses pulse current to achieve self-heating of the power battery 100; the switch assembly 400, wherein the switch assembly 400 includes multiple switches, and the multiple switches are arranged on the power supply link between the power battery 100, the drive system 200 and the charging port 300. The power battery 100 is provided with a self-heating control switch, and the switch assembly 400 controls the on and off of at least one power supply link to control the power battery 100 to enter at least one mode of direct fast charging mode, boost charging mode, boost charging mode and battery self-heating mode.

[0039] The power battery 100, as the primary energy storage component of an electric vehicle, provides the core function of providing electrical energy for vehicle operation. The drive system 200 not only regulates the motor's operating status but also performs multiple functions, including boosting the charging voltage and current, and heating the power battery 100. The charging port 300 serves as the connection between the vehicle and external charging facilities, allowing for the introduction of external charging current.

[0040] It is understood that the embodiments of the present application achieve flexible switching between multiple charging modes through the rational control of the switch assembly 400. This not only effectively improves charging efficiency and speed, but also rapidly raises the battery temperature in low-temperature environments through self-heating, ensuring the stable performance and service life of the power battery 100 in low-temperature conditions. Furthermore, it reduces dependence on additional hardware devices, achieving high integration and practicality.

[0041] In one embodiment of the present application, the drive system 200 includes an inverter and a motor, wherein one end of the motor is connected to the inverter, and the other end of the motor is connected to one end of the inductor, and the inverter is used to increase voltage and current.

[0042] Among them, the inverter is used to convert the direct current of the power battery 100 into alternating current during normal driving, thereby driving the motor to operate. At the same time, the inverter can also work in reverse to achieve voltage boosting, current increase, or be used to heat the power battery 100. As the core part of the drive device, the motor converts electrical energy into mechanical energy under normal driving conditions; in charging or low-temperature self-heating mode, it cooperates with the inverter to complete the conversion and regulation of electrical energy. One end of the motor is connected to the inverter and the other end is connected to the inductor. The inductor can store energy and regulate current in the current path, thereby cooperating with the drive system 200 to achieve the required energy management in the boost, current increase or battery self-heating mode.

[0043] It is understandable that by introducing a coordinated control mechanism of the inverter and motor into the drive system 200 and connecting the motor and inductor in series to form a controllable power regulation path, the system can flexibly implement multiple functions such as voltage boosting, current boosting, and self-heating of the power battery 100 during the charging process. This structure fully reuses existing drive components and reduces dependence on additional hardware. At the same time, in low-temperature environments, the self-heating function can enhance the battery reaction activity, shorten the heating time, and thus improve the overall charging efficiency.

[0044] In one embodiment of the present application, the inverter includes a plurality of power devices, and the plurality of power devices cooperate with each other to achieve voltage and current boosting.

[0045] It is understandable that if Figure 3 As shown, the inverter is equipped with multiple power devices Q1-Q6 to achieve high power output and precise control. Because a single power device has certain limitations in terms of voltage and current carrying capacity, connecting multiple power devices in series or parallel can effectively improve the inverter's overall voltage level and current carrying capacity, thereby better meeting the needs of different power level application scenarios.

[0046] In one embodiment of the present application, the switch assembly 400 includes first to ninth switches, wherein the negative electrode of the power battery 100 is connected to one end of the first switch and the fourth switch, the other end of the first switch is connected to one end of the second capacitor, one end of the fifth switch, one end of the eighth switch, and one end of the ninth switch, the other end of the fifth switch is connected to the other end of the inductor, the other end of the eighth switch is connected to a cell of the power battery 100, the other end of the ninth switch is connected to the negative electrode of the charging port 300, the other end of the fourth switch is respectively connected to one end of the first capacitor and the seventh switch, the other end of the seventh switch is connected to the negative electrode of the charging port 300, the positive electrode of the power battery 100 is respectively connected to one end of the second switch and one end of the third switch, the other end of the third switch is connected to one end of the resistor, the other end of the second switch is respectively connected to the other end of the resistor, the other end of the first capacitor, the other end of the second capacitor, and one end of the sixth switch, and the other end of the sixth switch is connected to the positive electrode of the charging port 300.

[0047] It is understandable that, through the orderly coordinated control of the first to ninth switches, the positive and negative poles of the power battery 100 can establish a variety of adjustable electrical connection paths with the capacitor, resistor and charging port 300 according to different operating requirements, thereby realizing a variety of working modes. In the battery self-heating mode, the resistor can be used as a heating element to heat the battery through the current, so that it can quickly heat up at low temperatures, improve activity and speed up charging response. In the boost or current boost mode, the current can form an energy regulation path through the inverter, motor and series inductor, and use the energy storage and smoothing effect of the inductor to increase the voltage, stabilize the current, and ensure efficient transmission of electric energy. The inductor can suppress high-frequency fluctuations and enhance the dynamic response of the system. The inverter is responsible for the conversion between DC and AC to ensure efficient operation of drive and charging management.

[0048] In one embodiment of the present application, the first to ninth switches are relays.

[0049] A relay is an electrical control device that uses electromagnetic principles to automatically switch circuits on and off. By energizing a coil, it generates a magnetic field that attracts or releases a mechanical contact, thereby connecting or disconnecting the controlled circuit. When the current in the control circuit reaches a certain value, the electromagnetic mechanism inside the relay pushes the contact to activate, completing the main circuit's on-off operation.

[0050] It is understandable that relays can achieve safe separation of control circuits and high-voltage circuits through electromagnetic isolation; relay contacts can withstand large currents, are suitable for high-power applications, and ensure reliable circuit switching; the combination of relays can flexibly switch circuit paths and support multiple functional modes.

[0051] like Figure 3As shown, K1 is the boost charging relay, K2 is the main positive relay, K3 is the pre-charge relay, K4 is the main negative relay, K5 is the filter capacitor relay, K6 is the fast charge positive relay, K7 is the fast charge negative relay, K8 is the self-heating relay, K9 is the boost relay, R1 is the pre-charge resistor, C1 is the motor controller bus capacitor, C2 is the charging filter capacitor, and Q1-Q6 are the motor controller power devices.

[0052] In one embodiment of the present application, a first capacitor and a second capacitor, wherein the first capacitor is a bus capacitor of the inverter, and the second capacitor is used for charging filtering.

[0053] The bus capacitor, connected to the inverter's DC bus, is used for energy storage and filtering, maintaining a stable DC bus voltage between the power supply and the load, suppressing voltage fluctuations and current ripple, and thus providing a strong guarantee for the inverter's smooth output. Charging filtering, during the electric vehicle charging process, uses filtering components such as capacitors and inductors to effectively suppress and smooth the pulsating components contained in the charging current or voltage, thereby achieving a more stable and pure DC output.

[0054] Specifically, if Figure 3 As shown, the first capacitor C1 is connected between the power battery 100 and the inverter to buffer the output of the battery. It can absorb the impact of instantaneous current changes when the load changes or the switch is switched, thereby effectively stabilizing the voltage on the DC bus. In addition, the first capacitor C1 can also suppress the high-frequency noise and current fluctuations caused by the switching action of the inverter. The filter capacitor C2 at the output end is connected in parallel with the charging port 300, and is mainly used to filter out the high-frequency components in the output current to reduce ripple and improve the quality of the output current. At the same time, C2 can provide current support when the instantaneous load changes, maintain the stability of the output voltage, and thus ensure the smoothness and safety of the charging process.

[0055] In one embodiment of the present application, if the second to seventh switches are closed and the first, fifth, eighth and ninth switches are disconnected, the power battery 100 enters a direct fast charging mode; if the second to sixth switches and the ninth switch are closed and the first, sixth and ninth switches are disconnected, the power battery 100 enters a boost charging mode; if the first to third switches and the fifth to seventh switches are closed and the fourth, eighth and ninth switches are disconnected, the power battery 100 enters a boost charging mode; if the second to fourth switches and the eighth switch are closed and the first Q1, Q3 and Q5 are disconnected to charge the upper half module battery, the pulsed battery self-heating function is achieved by controlling the frequency and duty cycle of the opening.

[0056] Specifically, when the system operates in direct fast charging mode, the system main circuit is as follows Figure 4As shown, relays K2, K3, K4, K6, and K7 are closed, and relays K1, K5, K8, and K9 are opened, and the external charging pile directly charges the power battery 100.

[0057] When the system works in boost mode, the main circuit of the system is as follows Figure 5 As shown, close relays K2, K3, K4, K5, K9, and K6, and open relays K1, K6, and K8. The inductor of the system is a configurable energy storage device. Depending on the actual effect, the inductor can be cancelled. After charging starts, due to the charging enlightenment stage, charging needs to detect the voltage platform of the vehicle. Therefore, at the beginning of charging, the system is in step-down mode, charging the C2 capacitor to provide a voltage acceptable to the charging pile. The specific steps are as follows: Figure 6 、 Figure 7 As shown in the figure, by controlling the switching states of Q2, Q4, and Q6, the voltage of the high-voltage battery pack is converted to low voltage, and the motor and inductor are used to store and release energy to keep the voltage of the capacitor at a ground voltage acceptable to the charging pile. Figure 8 As shown, the power devices Q1, Q3, and Q5 are closed, and the charging pile stores energy for the motor and inductor. Figure 9 As shown, the power devices Q1, Q3, and Q5 are turned off, and the energy of the inductive energy storage and the charging pile is superimposed to charge the power battery 100 through Q2, Q4, and Q6, thereby increasing the charging voltage.

[0058] When the system operates in boost mode, the system main circuit is as follows Figure 10 As shown, in the startup phase, the Figure 6 、 Figure 7 After the voltage of capacitor C2 is charged to a level close to the battery pack voltage, relays K4, K8, and K9 are disconnected, and relays K1, K2, K3, K5, K6, and K7 are closed. The inductor of the system is a configurable energy storage device. Depending on the actual effect, the inductor can be cancelled. After charging begins, Figure 11 As shown, the closed power devices Q2, Q4, and Q6 charge the pile to store energy for the motor and inductor. Figure 12 As shown, the power devices Q2, Q4, and Q6 are turned off, and the energy of the inductive energy storage and the charging pile is superimposed to charge the power battery 100 through the power devices Q1, Q3, and Q5, thereby increasing the charging current.

[0059] When the system works in heating mode, the main circuit of the system is as follows Figure 13 As shown, disconnect relays K1, K5, K6, K9, and K7, and close relays K2, K3, K4, and K8. The inductance of the system is a configurable energy storage device. According to the actual effect, the inductance can be cancelled. After charging starts, as shown in FIG. Figure 14 As shown, the power devices Q1, Q3, and Q5 are closed, and the upper half module battery is used to store energy for the motor and inductor. After the energy storage is completed, as shown in FIG. Figure 15As shown, power devices Q1, Q3, and Q5 are turned off, and the motor and inductor energy storage charges the battery of the lower half module, and an energy loop is formed through the body diodes of power devices Q2, Q4, and Q6; then Figure 16 As shown in the figure, power devices Q2, Q4, and Q6 are turned on, and the battery in the lower half of the module stores energy for the motor and inductor. After the energy storage is completed, as shown in the figure, Figure 17 As shown, the power devices Q2, Q4, and Q6 are turned off, and the energy stored in the motor and inductor is used to charge the upper module battery through the power devices Q1, Q3, and Q5. The self-heating function of the pulsed battery is achieved by controlling the opening frequency and duty cycle.

[0060] According to the common positive bus electric drive system boost and current heating system proposed in the embodiment of the present application, by setting a drive system between the power battery and the charging port, the charging voltage is boosted and the charging current is increased, which significantly improves the charging efficiency; at the same time, the drive system can also self-heat the power battery through pulse current, so that the battery can quickly reach a suitable working temperature even in a low temperature environment, improving the charging performance and environmental adaptability; the positive poles of the power battery, the drive system and the charging port are all connected to the positive bus. The system is also provided with a switch assembly composed of multiple switches, which can flexibly control the on and off of the power supply link according to demand, so that the power battery can switch between direct fast charging mode, boost charging mode, current increasing charging mode and battery self-heating mode to meet the use requirements in different scenarios. Thus, the problem that electric vehicles cannot adapt to multi-voltage charging piles in the related technology is solved.

[0061] An embodiment of the present application also provides an electric vehicle, including a common positive bus electric drive system boosting and current increasing heating system.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0064] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing a custom logical function or process step, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed in a different order than shown or discussed, including performing functions in a substantially simultaneous manner or in a reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0065] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, the steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement the method: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0066] A person skilled in the art may understand that all or part of the steps carried out in the method for implementing the above-mentioned embodiment may be completed by instructing the relevant hardware through a program, and the above-mentioned program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0067] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A common positive busbar electric drive system boosting and current heating system, characterized in that: include: Power battery and charging port; A drive system is provided between the power battery and the charging port, wherein the positive electrode of the power battery, the drive system, and the positive electrode of the charging port are all connected to a positive busbar, the drive system boosts the charging voltage and the charging current, and the drive system uses pulse current to achieve self-heating of the power battery; A switch assembly, wherein the switch assembly includes multiple switches, and the multiple switches are arranged on the power supply link between the power battery, the drive system and the charging port. The power battery is provided with a self-heating control switch, and the on and off of at least one power supply link is controlled by the switch assembly to control the power battery to enter at least one mode of direct fast charging mode, boost charging mode, current boost charging mode and battery self-heating mode.

2. The common positive busbar electric drive system voltage and current boosting and heating system according to claim 1, characterized in that: The drive system includes an inverter and a motor, wherein one end of the motor is connected to the inverter, and the other end of the motor is connected to one end of an inductor, and the inverter is used for boosting voltage and current.

3. The common positive busbar electric drive system voltage and current boosting and heating system according to claim 2, characterized in that: The inverter includes a plurality of power devices, and the plurality of power devices cooperate with each other to achieve voltage and current boosting.

4. The common positive busbar electric drive system voltage and current boosting and heating system according to claim 2, characterized in that: A first capacitor and a second capacitor, wherein the first capacitor is a bus capacitor of the inverter, and the second capacitor is used for charging filtering.

5. The common positive busbar electric drive system voltage and current boosting and heating system according to claim 4, characterized in that: The switch assembly includes first to ninth switches, wherein: The negative electrode of the power battery is connected to one end of the first switch and the fourth switch, the other end of the first switch is connected to one end of the second capacitor, one end of the fifth switch, one end of the eighth switch, and one end of the ninth switch, the other end of the fifth switch is connected to the other end of the inductor, the other end of the eighth switch is connected to a single cell of the power battery, the other end of the ninth switch is connected to the negative electrode of the charging port, the other end of the fourth switch is respectively connected to the first capacitor and one end of the seventh switch, the other end of the seventh switch is connected to the negative electrode of the charging port, the positive electrode of the power battery is respectively connected to one end of the second switch and one end of the third switch, the other end of the third switch is connected to one end of the resistor, the other end of the second switch is respectively connected to the other end of the resistor, the other end of the first capacitor, the other end of the second capacitor, and one end of the sixth switch, and the other end of the sixth switch is connected to the positive electrode of the charging port.

6. The common positive busbar electric drive system voltage and current boosting and heating system according to claim 5, characterized in that: If the second to seventh switches are closed and the first, fifth, eighth and ninth switches are opened, the power battery enters the direct fast charging mode; if the second to sixth switches and the ninth switch are closed and the first, sixth and ninth switches are opened, the power battery enters the boost charging mode; if the first to third switches and the fifth to seventh switches are closed and the fourth, eighth and ninth switches are opened, the power battery enters the boost charging mode; If the second to fourth switches and the eighth switch are closed, and the first switch, the fifth to seventh switches and the ninth switch are opened, the power battery enters a battery self-heating mode.

7. The common positive busbar electric drive system voltage and current boosting and heating system according to claim 5, characterized in that: The first to ninth switches are relays.

8. An electric vehicle, characterized in that: It includes the common positive bus electric drive system voltage and current boosting and heating system as described in any one of claims 1-7.

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