Boost and current increasing charging and battery self-heating system of electric vehicle driving system

Abstract

The invention relates to the technical field of new energy automobiles, in particular to an electric automobile driving system boosting and current increasing charging and battery self-heating system and an electric automobile. The system comprises a power battery, a driving system and a charging port, the power battery is connected with the driving system and the charging port, the driving system is connected with the charging port, and the driving system is connected with the charging port. The driving system is used for boosting the charging voltage, boosting the charging current and heating the power battery; and 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, and at least one of a direct fast charging mode, a boosting charging mode, a current boosting charging mode and a battery self-heating mode is realized by controlling the on-off of at least one power supply link. 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 an electric vehicle drive system boosting and current charging and battery self-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 an electric vehicle drive system boosting and current charging and battery self-heating system and an electric vehicle, so as 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 an electric vehicle drive system boost and current charging and battery self-heating system, including: a power battery, a drive system and a charging port, wherein the power battery is respectively connected to the drive system and the charging port, and the drive system is connected to the charging port, and the drive system is used to boost the charging voltage, increase the charging current and heat 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 by controlling the on and off of at least one power supply link, at least one mode of direct fast charging mode, boost charging mode, current increasing charging mode and battery self-heating mode is realized.

[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 an inductor.

[0007] Optionally, in one embodiment of the present application, the switch assembly includes first to eighth switches, wherein the positive pole of the power battery is connected to one end of the first switch, one end of the second switch and one end of the third switch, the other end of the first switch is connected to the other end of the inductor, the other end of the second switch is connected to one end of the sixth switch, the other end of the sixth switch is connected to the positive pole of the charging port, the other end of the third switch is connected to one end of the resistor, the other end of the resistor is connected to the second end of the second switch, the negative pole of the power battery is connected to one end of the fourth switch, the other end of the fourth switch is connected to one end of the seventh switch, the other end of the seventh switch is connected to the negative pole of the charging port, the inverter is respectively connected to the other end of the second switch and the other end of the fourth switch, one end of the fifth switch is connected to the other end of the inductor and the other end of the first switch, and one end of the eighth switch is connected to the positive pole of the charging port.

[0008] Optionally, in one embodiment of the present application, it also includes: a first capacitor and a second capacitor, wherein one end of the first capacitor is connected to the other end of the second switch, the other end of the first capacitor is connected to the other end of the fourth switch, one end of the second capacitor is connected to the other end of the fifth switch, and the other end of the second capacitor is respectively connected to the other end of the fourth switch and one end of the seventh switch.

[0009] Optionally, in one embodiment of the present application, the other end of the fifth switch is connected to the other end of the eighth switch.

[0010] Optionally, in one embodiment of the present application, one end of the fifth switch is connected to the other end of the eighth switch.

[0011] Optionally, in one embodiment of the present application, if the second to fourth switches, the sixth switch and the seventh switch are closed and the first switch, the fifth switch and the eighth switch are disconnected, the direct fast charging mode is entered; if the second to fifth switches, the seventh switch and the eighth switch are closed and the first and sixth switches are disconnected, the boost charging mode is entered; if the first switch, the fourth to seventh switches are closed and the second switch, the third switch and the eighth switch are disconnected, the boost charging mode is entered; if the second to fourth switches are closed and the first switch and the fifth to eighth switches are disconnected, the battery self-heating mode is entered; if the second to fifth switches are closed and the first switch and the sixth to eighth switches are disconnected, the battery self-heating mode is entered.

[0012] Optionally, in one embodiment of the present application, the first to eighth switches are relays.

[0013] Optionally, in one embodiment of the present application, the inverter includes a plurality of power devices.

[0014] A second embodiment of the present application provides an electric vehicle, comprising the electric vehicle drive system boosting and current charging and battery self-heating system of the first embodiment.

[0015] Therefore, this application has the following beneficial effects:

[0016] The power battery of the present application is connected to the drive system and the charging port respectively, and the drive system is connected to the charging port. The drive system is used to realize charging voltage boost and charging current boost, improve charging efficiency and compatibility, and support charging piles with different voltage levels. At the same time, the drive system can realize self-heating of the power battery, accelerate the temperature rise of the battery at low temperatures, improve temperature uniformity, and ensure battery performance and life. The system also sets multiple switches on the power supply link between the power battery, the drive system and the charging port. By controlling the on and off of at least one power supply link, it realizes multiple charging working states such as direct fast charging mode, boost charging mode, current boost charging mode and battery self-heating mode, thereby enhancing the flexibility and adaptability of the charging process. Thus, the problem that electric vehicles cannot adapt to multi-voltage charging piles in the related art is solved.

[0017] 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

[0018] 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:

[0019] Figure 1 A schematic diagram of a high-voltage architecture of the related technology;

[0020] Figure 2 This is a structural diagram of a boost and current charging and battery self-heating system for an electric vehicle drive system according to an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a high-voltage architecture according to a first embodiment of the present application;

[0022] Figure 4 is a schematic diagram of a high-voltage structure according to a second embodiment of the present application;

[0023] Figure 5 This is a circuit diagram of a direct fast charging mode according to an embodiment of the present application;

[0024] Figure 6 This is a functional diagram of the direct fast charging mode according to an embodiment of the present application;

[0025] Figure 7 1 is a main circuit diagram of a boost charging mode according to an embodiment of the present application;

[0026] Figure 8 This is a schematic diagram of voltage conversion in boost charging mode according to one embodiment of the present application;

[0027] Figure 9 This is a schematic diagram of voltage conversion in boost charging mode according to another embodiment of the present application;

[0028] Figure 10 Schematic diagram of energy storage in boost charging mode according to an embodiment of the present application;

[0029] Figure 11 A schematic diagram of voltage increase in boost charging mode according to an embodiment of the present application;

[0030] Figure 12 This is a main circuit diagram of the boost charging mode according to an embodiment of the present application;

[0031] Figure 13 Schematic diagram of energy storage in a boost charging mode according to an embodiment of the present application;

[0032] Figure 14 Schematic diagram of current increase in boost charging mode according to an embodiment of the present application;

[0033] Figure 15 1 is a main circuit diagram of a battery heating mode according to an embodiment of the present application;

[0034] Figure 16 Schematic diagram of energy storage in a battery heating mode according to an embodiment of the present application;

[0035] Figure 17 Schematic diagram of a self-heating mode of battery heating according to an embodiment of the present application;

[0036] Figure 18 This is a main circuit diagram of the battery heating mode 2 according to an embodiment of the present application;

[0037] Figure 19 2 is a diagram of the LC resonance stage of the battery heating mode according to an embodiment of the present application;

[0038] Figure 20 This is a diagram of the second energy transfer stage of the battery heating mode according to an embodiment of the present application;

[0039] Figure 21 Schematic diagram of energy release in battery heating mode 2 according to an embodiment of the present application;

[0040] Figure 22 FIG. 1 is a schematic diagram of self-heating in battery heating mode 2 according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] 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.

[0042] The following describes, with reference to the accompanying drawings, an electric vehicle drive system boosting and charging, and battery self-heating system, and an electric vehicle according to embodiments of the present application. To address the issues mentioned in the background art, the present application provides an electric vehicle drive system boosting and charging, and battery self-heating system. In this system, a power battery is connected to a drive system and a charging port, respectively. The drive system is connected to the charging port, and the drive system is utilized to boost the charging voltage and current, improving charging efficiency and compatibility, and supporting charging stations with different voltage levels. Furthermore, the drive system enables self-heating of the power battery, accelerating battery temperature rise at low temperatures, improving temperature uniformity, and ensuring battery performance and lifespan. The system also includes multiple switches disposed on the power supply link between the power battery, the drive system, and the charging port. By controlling the on / off state of at least one power supply link, multiple charging operating modes, including direct fast charging mode, boost charging mode, boost charging mode, and battery self-heating mode, are implemented, enhancing the flexibility and adaptability of the charging process. This solves the problems of related technologies, such as the inability to adapt to multi-voltage charging stations and the failure to utilize the boost and self-heating of the electric drive system, resulting in slow temperature rise and uneven temperature at low temperatures.

[0043] Specifically, Figure 2 A block diagram of a boost and current charging and battery self-heating system for an electric vehicle drive system provided in an embodiment of the present application.

[0044] like Figure 2 As shown, the electric vehicle drive system boost charging and battery self-heating system 10 includes: a power battery 100, a drive system 200, a charging port 300 and a switch assembly 400.

[0045] Among them, the power battery 100 is respectively connected to the drive system 200 and the charging port 300, and the drive system 200 is connected to the charging port 300. The drive system 200 is used to boost the charging voltage, increase the charging current and heat the power battery 100; 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. By controlling the on and off of at least one power supply link, at least one mode of direct fast charging mode, boost charging mode, current increase charging mode and battery self-heating mode is realized.

[0046] The power battery 100 is the primary energy storage device in electric vehicles, responsible for providing the electrical energy required for vehicle operation. The drive system 200 controls the operation of the motor, boosts the charging voltage and current, and heats the power battery 100. The charging port 300 connects the vehicle's exterior to the charging device and receives the charging current.

[0047] It is understandable that the embodiment of the present application can achieve flexible switching of multiple charging modes by reasonably controlling the switch component 400, which can not only improve the charging efficiency and speed, but also quickly increase the battery temperature through the self-heating function in a low-temperature environment, thereby ensuring the performance and life of the power battery 100, while reducing dependence on additional hardware.

[0048] 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 an inductor.

[0049] The inverter is used to convert the direct current from the power battery 100 into alternating current to drive the motor. It can also work in reverse under specific control strategies to achieve functions such as voltage boosting, current boosting, or battery heating. As a drive device, the motor is responsible for converting electrical energy into mechanical energy to propel the vehicle under normal driving conditions. In charging or low-temperature heating modes, it serves as part of the energy regulation pathway and works with the inverter to complete energy conversion and regulation. The motor is connected to the inverter and inductor, respectively. The inductor is used to store and regulate energy in the current path, cooperating with the drive system 200 to achieve the required energy management in voltage boosting, current boosting, or battery self-heating modes.

[0050] It is understood that by introducing coordinated control of the inverter and motor into the drive system 200 and connecting the motor in series with the inductor to form a controllable power regulation path, the system can flexibly implement functions such as voltage boosting, current boosting, and self-heating of the power battery 100 during charging. This structure reuses existing drive components, reducing additional hardware costs. In low-temperature environments, battery self-heating accelerates reaction activity, shortens battery warm-up time, and improves charging efficiency.

[0051] The drive system 200 of the embodiment of the present application includes an inverter and a motor.

[0052] like Figure 3 and Figure 4 As shown, the inverter includes a plurality of power devices Q1-Q6.

[0053] Understandably, inverters contain multiple power devices to meet the demands of high power output and precise control. A single power device has limited voltage and current capabilities. By connecting multiple devices in series or parallel, the overall voltage and current carrying capacity can be increased, adapting to applications of varying power levels.

[0054] In one embodiment of the present application, the switch assembly 400 includes first to eighth switches, wherein the positive electrode of the power battery 100 is connected to one end of the first switch, one end of the second switch, and one end of the third switch, the other end of the first switch is connected to the other end of the inductor, the other end of the second switch is connected to one end of the sixth switch, the other end of the sixth switch is connected to the positive electrode of the charging port 300, the other end of the third switch is connected to one end of the resistor, the other end of the resistor is connected to the second end of the second switch, the negative electrode of the power battery 100 is connected to one end of the fourth switch, the other end of the fourth switch is connected to one end of the seventh switch, the other end of the seventh switch is connected to the negative electrode of the charging port 300, the inverter is respectively connected to the other end of the second switch and the other end of the fourth switch, one end of the fifth switch is connected to the other end of the inductor and the other end of the first switch, and one end of the eighth switch is connected to the positive electrode of the charging port 300.

[0055] As you can see, switches form a switchable current path, regulating voltage and current to support functions such as charging, boosting, and self-heating. Inductors store energy to smooth the current, while resistors limit it or self-heat, allowing the battery to quickly warm up from a low temperature, improving charging efficiency. Inverters convert DC to AC, ensuring drive and charging management. The combination of multiple switches, inductors, resistors, and inverters enables multifunctional and flexible control of the power battery charging system.

[0056] In one embodiment of the present application, the first to eighth switches are relays.

[0057] Among them, a relay is an electrical control device that uses electromagnetic principles to achieve automatic switching control of the circuit. It generates a magnetic field by energizing the coil, attracting or releasing a mechanical contact, thereby connecting or disconnecting the controlled circuit.

[0058] 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.

[0059] like Figure 3 As shown, in the embodiment of the present application, K1 is a boost charging relay, K2 is a main positive relay, K3 is a pre-charge relay, K4 is a main negative relay, K5 is a filter capacitor relay, K6 is a fast charge positive relay, K7 is a fast charge negative relay, and K8 is a boost relay.

[0060] In one embodiment of the present application, the other end of the fifth switch is connected to the other end of the eighth switch.

[0061] It is understandable that the design mode is suitable for use in a boost charging mode, has a high energy transmission efficiency, and can achieve fast high-voltage charging of the power battery 100 .

[0062] like Figure 3 As shown, K5, K8, and capacitor C2 are connected in series, forming an energy transmission path from inductor to K5, K8, C2, and then to the fast-charging port. After the motor windings store energy in the boost inductor, controlling the closing of K5 and K8 allows the energy stored in the inductor to be released to the fast-charging port through C2, forming a boost charging process. During this process, C2 not only acts as a filter but also coordinates with the inductor to regulate the output voltage, making it higher and more stable.

[0063] In one embodiment of the present application, one end of the fifth switch is connected to the other end of the eighth switch.

[0064] It is understandable that the design pattern improves the system's adaptability to different battery states and load characteristics. Figure 4 As shown, the boost inductor path controlled by K5 is connected in parallel with capacitor C2 to K8. The inductor and capacitor are independently connected to the output path, making this structure more suitable for boosting current or constant voltage mode. C2 continuously provides voltage support to the fast charging port, stabilizing the output voltage, while the inductor is mainly used to control and adjust the current waveform.

[0065] The high-voltage architecture technical solution of the embodiment of the present application is as follows Figure 3 and Figure 4 As shown, K1-K8 are multiple switches, R1 is a pre-charging resistor, C1 and C2 are capacitors, and Q1-Q6 are inverters.

[0066] like Figure 3 and Figure 4 As shown, the power battery 100 includes power batteries BT1 and BT2 on the left side of the diagram; the drive system 200 includes Q1-Q6 and the motor in the middle of the diagram; and the charging port 300 includes the fast charging port on the right side of the diagram. The battery is connected to the drive system 200 in the middle through switches such as K1, K2, K3, and K4, and is also connected to the fast charging port on the right through paths K6, K8, and K7 on the right. The connection between the drive system 200 and the charging port 300 extends from the motor to the inductor and capacitor on the right, and then to K5, K8, and the fast charging port. All the switches marked K1-K8 in the figure are multiple switches. By controlling the on and off states of different switches, different charging modes can be switched, including direct fast charging, boost charging, boost current charging, and battery self-heating, thereby improving the system's adaptability and charging efficiency under different operating conditions.

[0067] In one embodiment of the present application, the system of the embodiment of the present application also includes: a first capacitor and a second capacitor, wherein one end of the first capacitor is connected to the other end of the second switch, the other end of the first capacitor is connected to the other end of the fourth switch, one end of the second capacitor is connected to the other end of the fifth switch, and the other end of the second capacitor is respectively connected to the other end of the fourth switch and one end of the seventh switch.

[0068] The first capacitor in this embodiment is the motor controller bus capacitor, which stabilizes the DC bus voltage, suppresses voltage spikes and noise, and ensures stable operation of the inverter and motor. The second capacitor is a charging filter capacitor, which smooths current fluctuations, filters out ripple and interference, and improves the stability and efficiency of the charging process.

[0069] It is understandable that if Figure 3 and Figure 4 As shown, the first capacitor is connected between the second and fourth switches and serves as the bus capacitor for the motor controller. It is primarily used to stabilize the motor controller bus voltage, filter out high-frequency noise and voltage fluctuations, and ensure the normal operation of the inverter and motor control system. The second capacitor is connected between the fifth, fourth, and seventh switches and serves as a charging filter capacitor. It is primarily used to smooth current fluctuations generated during charging, reduce electromagnetic interference and charging noise, and improve the stability and efficiency of the charging process. By configuring these two capacitors separately, the voltage stability of the motor control is guaranteed and the filtering performance of the charging link is optimized.

[0070] In one embodiment of the present application, if the second to fourth switches, the sixth switch and the seventh switch are closed and the first switch, the fifth switch and the eighth switch are disconnected, the direct fast charging mode is entered; if the second to fifth switches, the seventh switch and the eighth switch are closed and the first and sixth switches are disconnected, the boost charging mode is entered; if the first switch, the fourth to seventh switches are closed and the second switch, the third switch and the eighth switch are disconnected, the boost charging mode is entered; if the second to fourth switches are closed and the first switch and the fifth to eighth switches are disconnected, the battery self-heating mode is entered; if the second to fifth switches are closed and the first switch and the sixth to eighth switches are disconnected, the battery self-heating mode is entered.

[0071] It is understandable that by precisely controlling the relay combination and switching between multiple charging and heating modes, flexible adjustment of charging voltage and current can be achieved, thereby improving charging speed and efficiency. At the same time, the self-heating mode is used to quickly heat up, ensuring battery performance in low-temperature environments and enhancing system adaptability without the need for additional hardware, thereby reducing cost and complexity.

[0072] Specifically, when the system operates in direct fast charging mode, the system main circuit is as follows Figure 5 、 6As shown, the relays K2, K3, K4, K6, and K7 are closed, and the relays K1, K5, and K8 are opened, and the external charging pile directly charges the power battery 100.

[0073] When the system works in boost mode, the main circuit of the system is as follows Figure 7 As shown, close relays K2, K3, K4, K5, K8, and K7, and open relays K1 and K6. The inductor of the system is a configurable energy storage device. Depending on the actual effect, the inductor can be cancelled and charging can begin. After charging begins, 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 8 、 9 As shown in the figure, by controlling the switching states of power devices Q1, Q3, and Q5, 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 10 As shown, the power devices Q4, Q2, and Q6 are closed, and the charging pile stores energy for the motor and inductor. Figure 11 As shown, the power devices Q4, Q2, 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 Q1, Q3, and Q5, thereby increasing the charging voltage.

[0074] When the system operates in boost mode, the system main circuit is as follows Figure 12 As shown, in the startup phase, the Figure 8 、 9 After the voltage of capacitor C2 is charged to a level close to the battery pack voltage, relays K2, K3, and K8 are disconnected, and relays K1, K4, 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 13 As shown, the power devices Q1, Q3, and Q5 are closed, and the charging pile stores energy for the motor and inductor. Figure 14 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 current.

[0075] When the system is working in heating mode, if Figure 15 、 16 , 17 working mode, the system main circuit is as follows Figure 15 As shown, disconnect relays K1, K5, K6, K8, and K7, and close relays K2, K4, and K3. The system's motor inductance energy storage device, such as Figure 16As shown, the power devices Q1, Q6 or Q1, Q4 or Q3, Q6 or Q3, Q2 or Q5, Q4 or Q5, Q2 are turned on, and the power battery 100 stores energy in the motor inductor. After the energy storage is completed, as shown in FIG. Figure 17 As shown, the power devices Q1, Q6 or Q1, Q4 or Q3, Q6 or Q3, Q2 or Q5, Q4 or Q5, Q2 are turned off, and the motor inductance energy storage reversely charges the power battery 100 through the body diode of the power device, forming a pulse AC. The pulsed battery self-heating function is achieved by controlling the frequency and duty cycle of the opening;

[0076] When the system is working in heating mode, if Figure 18 、 19 , 20 working modes, the system main circuit is as follows Figure 18 As shown, disconnect relays K1, K6, K8, and K7, and close relays K2, K4, K3, and K5. Turn on power devices Q1, Q3, and Q5, and the power battery 100 charges the motor inductance, inductance, and capacitor C2. The inductance can be configured according to actual needs. Turn off power devices Q1, Q3, and Q5. The motor inductance, inductance, and capacitor C2 form an LC AC sinusoidal oscillation, where LC resonance is an electrical resonance generated by a circuit composed of an inductor (L) and a capacitor (C). A reverse charging current is formed through the body diodes of power devices Q1, Q3, and Q5 to charge the battery, as shown in FIG. Figure 21 Turn on the power devices Q2, Q4, and Q6 to transfer the energy of the capacitor to the inductor, and turn off the power devices Q2, Q4, and Q6. Figure 22 , the inductive energy is completely released to the power battery 100, and the self-heating function of the pulsed battery is realized by controlling the opening frequency and duty cycle.

[0077] According to the electric vehicle drive system boost charging and battery self-heating system proposed in the embodiment of the present application, the power battery is connected to the drive system and the charging port respectively, and the drive system is connected to the charging port. The drive system is used to achieve charging voltage boost and charging current boost, improve charging efficiency and compatibility, and support charging piles with different voltage levels. At the same time, the drive system can achieve power battery self-heating, accelerate battery temperature rise at low temperatures, improve temperature uniformity, and ensure battery performance and life. The system also sets multiple switches on the power supply link between the power battery, the drive system and the charging port. By controlling the on and off of at least one power supply link, it realizes multiple charging working states such as direct fast charging mode, boost charging mode, boost charging mode and battery self-heating mode, thereby enhancing the flexibility and adaptability of the charging process. Thus, it solves the problems that the related technology cannot adapt to multi-voltage charging piles, does not utilize the electric drive system for boosting and self-heating, and leads to slow temperature rise and uneven temperature at low temperatures.

[0078] An embodiment of the present application also provides an electric vehicle, including an electric vehicle drive system boosting and current charging and a battery self-heating system.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 boost and current charging and battery self-heating system for an electric vehicle drive system, characterized in that: include: A power battery, a drive system, and a charging port, wherein the power battery is connected to the drive system and the charging port respectively, and the drive system is connected to the charging port, and the drive system is used to boost the charging voltage and current and to heat 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. By controlling the on and off of at least one power supply link, at least one mode of direct fast charging mode, boost charging mode, boost current charging mode and battery self-heating mode is realized.

2. The electric vehicle drive system boosting and current charging and battery self-heating system according to claim 1 is 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.

3. The electric vehicle drive system voltage boost and current boost charging and battery self-heating system according to claim 2, characterized in that: The switch assembly includes first to eighth switches, wherein: The positive electrode of the power battery is connected to one end of the first switch, one end of the second switch, and one end of the third switch. The other end of the first switch is connected to the other end of the inductor, the other end of the second switch is connected to one end of the sixth switch, the other end of the sixth switch is connected to the positive electrode of the charging port, the other end of the third switch is connected to one end of the resistor, the other end of the resistor is connected to the second end of the second switch, the negative electrode of the power battery is connected to one end of the fourth switch, the other end of the fourth switch is connected to one end of the seventh switch, the other end of the seventh switch is connected to the negative electrode of the charging port, the inverter is respectively connected to the other end of the second switch and the other end of the fourth switch, one end of the fifth switch is connected to the other end of the inductor and the other end of the first switch, and one end of the eighth switch is connected to the positive electrode of the charging port.

4. The electric vehicle drive system voltage boosting and current boosting charging and battery self-heating system according to claim 3 is characterized in that: Also includes: a first capacitor and a second capacitor, wherein one end of the first capacitor is connected to the other end of the second switch, the other end of the first capacitor is connected to the other end of the fourth switch, one end of the second capacitor is connected to the other end of the fifth switch, and the other end of the second capacitor is respectively connected to the other end of the fourth switch and one end of the seventh switch.

5. The electric vehicle drive system voltage boost and current boost charging and battery self-heating system according to claim 4, characterized in that: The other end of the fifth switch is connected to the other end of the eighth switch.

6. The electric vehicle drive system voltage boosting and current boosting charging and battery self-heating system according to claim 4, characterized in that: One end of the fifth switch is connected to the other end of the eighth switch.

7. The electric vehicle drive system voltage boosting and current boosting charging and battery self-heating system according to claim 3, characterized in that: If the second to fourth switches, the sixth switch and the seventh switch are closed and the first switch, the fifth switch and the eighth switch are disconnected, the direct fast charging mode is entered; if the second to fifth switches, the seventh switch and the eighth switch are closed and the first and sixth switches are disconnected, the boost charging mode is entered; if the first switch, the fourth to seventh switches are closed and the second switch, the third switch and the eighth switch are disconnected, the current boost charging mode is entered; if the second to fourth switches are closed and the first switch and the fifth to eighth switches are disconnected, the battery self-heating mode is entered; if the second to fifth switches are closed and the first switch and the sixth to eighth switches are disconnected, the battery self-heating mode is entered.

8. The electric vehicle drive system voltage boost and current boost charging and battery self-heating system according to claim 3, characterized in that: The first to eighth switches are relays.

9. The electric vehicle drive system voltage boosting and current boosting charging and battery self-heating system according to claim 3, characterized in that: The inverter includes a plurality of power devices.

10. An electric vehicle, characterized in that: The invention comprises the electric vehicle drive system voltage-boosting and current-boosting charging and battery self-heating system as described in any one of claims 1 to 9.

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