Positive-bus-sharing boosting and current-increasing charging and battery self-heating system for electric vehicle

Abstract

The invention relates to the technical field of new energy automobiles, in particular to an electric automobile voltage and current boosting charging and battery self-heating system sharing a positive bus and an electric automobile. The system comprises a power battery, a driving system and a 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 a positive bus, and the positive bus is connected with a negative bus. The cathode of the power battery, the driving system and the cathode of the charging port are connected with a plurality of cathode buses, and 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 the power battery is controlled to enter at least one mode of a direct fast charging mode, a boosting charging mode, a current boosting charging mode and a battery self-heating mode 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 technical field of new energy vehicles, and in particular to a common positive bus electric vehicle boosting and current-increasing 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 boost and current charging and battery self-heating system with a common positive bus, and an electric vehicle, to solve the problem in related technologies that electric vehicles cannot adapt to multi-voltage charging piles.

[0005] The first aspect of the present application provides an electric vehicle boost and current charging with a common positive bus, comprising: a power battery, a drive system and a charging port, wherein the positive pole of the power battery, the drive system and the charging port are all connected to the positive bus, and the negative pole of the power battery, the drive system and the negative pole of the charging port are connected to multiple negative bus bars, 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 multiple switches, and the multiple 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, the power battery is controlled 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.

[0007] Optionally, in one embodiment of the present application, the inverter includes a plurality of power devices.

[0008] Optionally, in one embodiment of the present application, it further includes: 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 eighth switches, wherein:

[0010] 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 and one end of the eighth switch, the other end of the eighth 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 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.

[0011] Optionally, in one embodiment of the present application, the other end of the inductor is connected to one end of the fifth switch, the other end of the fifth switch is respectively connected to the other end of the first switch, one end of the eighth switch and one end of the second capacitor, and the other end of the second capacitor is respectively connected to the other end of the second switch and one end of the sixth switch.

[0012] Optionally, in one embodiment of the present application, the other end of the inductor is respectively connected to the other end of the first switch, one end of the eighth switch and one end of the second capacitor, the other end of the second capacitor is connected to one end of the fifth switch, and the other end of the fifth switch is respectively connected to the other end of the second switch and one end of the sixth switch.

[0013] Optionally, in one embodiment of the present application, if the second to seventh switches are closed and the first switch, the fifth switch and the eighth switch are disconnected, the power battery enters the direct fast charging mode; if the second to sixth switches and the eighth switch are closed and the first switch and the seventh 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 and the eighth switch are disconnected, the power battery enters the boost charging mode; if the second to fourth switches are closed and the first switch and the fifth to eighth switches are disconnected, the power battery enters the battery self-heating mode; if the second to fifth switches are closed and the first switch and the sixth to eighth switches are disconnected, the power battery enters the battery self-heating mode.

[0014] Optionally, in one embodiment of the present application, the first to eighth switches are relays.

[0015] A second aspect of the present application provides an electric vehicle, comprising the electric vehicle boost and current charging and battery self-heating system with a common positive bus according to the first aspect.

[0016] Therefore, this application has the following beneficial effects:

[0017] In this application, the positive poles of the power battery, drive system and charging port are all connected to the same positive bus, and the negative poles are connected to multiple negative bus bars to build a unified power supply structure. Under this structure, the drive system can boost the external charging voltage and increase the charging current, and can heat the power battery to improve the working performance in a low temperature environment. The system also includes a switch assembly composed of multiple switches, and the switches are distributed in the power supply link between the power battery, drive system and charging port. By controlling the on and off state of each switch, it is possible to flexibly switch into multiple modes such as direct fast charging, boost charging, current-increasing charging and battery self-heating to meet the charging and heating needs in different usage scenarios. Thus, it solves the problem that electric vehicles in related technologies cannot adapt to multi-voltage charging piles.

[0018] 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

[0019] 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:

[0020] Figure 1 A schematic diagram of a high-voltage architecture of the related technology;

[0021] Figure 2 This is a structural diagram of a common positive bus boost charging and battery self-heating system for an electric vehicle according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of a high-voltage structure according to the first embodiment of the present application;

[0023] Figure 4 is a schematic diagram of a high-voltage structure according to a second embodiment of the present application;

[0024] Figure 5 This is a circuit diagram of a direct fast charging mode according to an embodiment of the present application;

[0025] Figure 6 This is a functional diagram of the direct fast charging mode according to an embodiment of the present application;

[0026] Figure 7 1 is a main circuit diagram of a boost charging mode according to an embodiment of the present application;

[0027] Figure 8 This is a schematic diagram of voltage conversion in boost charging mode according to one embodiment of the present application;

[0028] Figure 9This is a schematic diagram of voltage conversion in boost charging mode according to another embodiment of the present application;

[0029] Figure 10 Schematic diagram of energy storage in boost charging mode according to an embodiment of the present application;

[0030] Figure 11 A schematic diagram of voltage increase in boost charging mode according to an embodiment of the present application;

[0031] Figure 12 This is a main circuit diagram of the boost charging mode according to an embodiment of the present application;

[0032] Figure 13 Schematic diagram of energy storage in a boost charging mode according to an embodiment of the present application;

[0033] Figure 14 Schematic diagram of current increase in boost charging mode according to an embodiment of the present application;

[0034] Figure 15 1 is a main circuit diagram of a battery heating mode according to an embodiment of the present application;

[0035] Figure 16 Schematic diagram of energy storage in a battery heating mode according to an embodiment of the present application;

[0036] Figure 17 Schematic diagram of a self-heating mode of battery heating according to an embodiment of the present application;

[0037] Figure 18 This is a main circuit diagram of the battery heating mode 2 according to an embodiment of the present application;

[0038] Figure 19 2 is a diagram of the LC resonance stage of the battery heating mode according to an embodiment of the present application;

[0039] 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;

[0040] Figure 21 Schematic diagram of energy release in battery heating mode 2 according to an embodiment of the present application;

[0041] 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

[0042] 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.

[0043] The following describes, with reference to the accompanying drawings, an electric vehicle boost charging and battery self-heating system and an electric vehicle with a common positive busbar according to an embodiment of the present application. In response to the problems mentioned in the background art, the present application provides an electric vehicle boost charging and battery self-heating system with a common positive busbar. In this system, the positive poles of the power battery, drive system, and charging port are all connected to the same positive busbar, while the negative poles are connected to multiple negative busbars, forming a unified power supply structure. Under this structure, the drive system can boost the external charging voltage and increase the charging current, and can heat the power battery to improve its performance in low-temperature environments. The system also includes a switch assembly consisting of multiple switches, which are distributed in the power supply link between the power battery, drive system, and charging port. By controlling the on / off state of each switch, it is possible to flexibly switch between multiple modes such as direct fast charging, boost charging, boost charging, and battery self-heating to meet the charging and heating requirements in different usage scenarios. This solves the problem in the related art that electric vehicles cannot adapt to multi-voltage charging piles.

[0044] Specifically, Figure 2 A block diagram of a common positive bus boost charging and battery self-heating system for electric vehicles provided in an embodiment of the present application.

[0045] like Figure 2 As shown, the common positive bus electric vehicle boost charging and battery self-heating system includes: a power battery 100, a drive system 200, a charging port 300 and a switch assembly 400.

[0046] Among them, the positive electrode of the power battery 100, the positive electrode of the drive system 200 and the charging port 300 are all connected to the positive bus, and the negative electrode of the power battery 100, the drive system 200 and the negative electrode of the charging port 300 are connected to multiple negative busbars. 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, 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. By controlling the on and off of at least one power supply link, the power battery 100 is controlled to enter at least one mode of direct fast charging mode, boost charging mode, boost current charging mode and battery self-heating mode.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] In one embodiment of the present application, an inverter includes a plurality of power devices.

[0053] It is understandable that if Figure 3 and Figure 4 As shown, the inverter includes multiple power devices Q1-Q6. The inverter incorporates multiple power devices to meet the requirements 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 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 and one end of the eighth switch, the other end of the eighth switch is connected to the negative electrode of the charging port 300, 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 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 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.

[0055] It can be understood that through the coordinated switching of the first to eighth switches, various connection combinations of the positive and negative poles of the battery and the capacitor, resistor and charging port 300 can be realized, which can not only balance the charging and discharging of the capacitor, filter out current fluctuations, and reduce electromagnetic interference, but also achieve soft start or current limiting protection through resistors. The switches constitute a switchable current path, adjust the voltage and current, and support functions such as charging, boosting and self-heating; the inductor energy storage smoothes the current, the resistor limits the current or self-heating, so that the battery can quickly heat up at low temperature and improve the charging efficiency; the inverter realizes DC-AC conversion to ensure drive and charging management.

[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 and Figure 4 As 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 boost relay, and R1 is the pre-charge resistor.

[0060] In one embodiment of the present application, it further includes: 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.

[0061] The bus capacitor is connected to the inverter's DC bus for energy storage and filtering. It stabilizes the DC bus voltage between the power supply and the load, suppresses voltage fluctuations and current ripple, and ensures a smooth inverter output. Charging filtering is the process of smoothing the pulsating components of the charging current or voltage during electric vehicle charging using filter components such as capacitors and inductors to achieve a more stable and purer DC output.

[0062] It is understandable that if Figure 3 and Figure 4 The first capacitor C1 serves as the bus capacitor of the inverter, which can stabilize the voltage on the DC side of the inverter, suppress voltage fluctuations, and improve the reliability and response speed of the drive system 200; the second capacitor C2 is set in the fast charging path, mainly used to filter the charging current, reduce current pulsation, and improve the stability of the charging current.

[0063] In one embodiment of the present application, the other end of the inductor is connected to one end of the fifth switch, the other end of the fifth switch is respectively connected to the other end of the first switch, one end of the eighth switch and one end of the second capacitor, and the other end of the second capacitor is respectively connected to the other end of the second switch and one end of the sixth switch.

[0064] It is understandable that if Figure 3 As shown, the fifth switch K5 acts as a bridge between the inductor and the first switch K1, the eighth switch K8, and the second capacitor C2, flexibly controlling the current path at the inductor port. The switching action of the fifth switch K5 determines the connection state between the inductor and the other switches and capacitors, thereby finely adjusting the voltage.

[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-charge resistor, C1 and C2 are capacitors, and Q1-Q6 are inverters. 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 center of the diagram; and the charging port 300 includes the fast charging port on the right side of the diagram.

[0066] The power battery 100 is composed of BT1 and BT2 connected in series to form the main power supply. The positive electrode is connected to capacitor C1 via K3 and R1, and further connected to inverters Q1-Q6 and the motor, forming the drive system 200. The output of the drive system 200 is connected to the fast charging port through an inductor, and the current path is controlled by multiple relays K1, K4, K5, K6, K7, and K8. 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 functions, thereby improving the system's adaptability and charging efficiency under different operating conditions.

[0067] In one embodiment of the present application, the other end of the inductor is respectively connected to the other end of the first switch, one end of the eighth switch and one end of the second capacitor, the other end of the second capacitor is connected to one end of the fifth switch, and the other end of the fifth switch is respectively connected to the other end of the second switch and one end of the sixth switch.

[0068] It is understandable that if Figure 4 As shown, the inductor is directly connected to the first switch K1, the eighth switch K8, and the second capacitor C2. The fifth switch K5 is located between the second capacitor C2, the second switch K2, and the sixth switch K6, and is primarily responsible for controlling the connection between the second capacitor C2 and the back-end switches. The fifth switch K5 is primarily used to adjust the current flow on the capacitor side, improving charging filtering performance and system dynamic response.

[0069] In one embodiment of the present application, if the second to seventh switches are closed and the first, fifth and eighth switches are disconnected, the power battery 100 enters a direct fast charging mode; if the second to sixth switches and the eighth switch are closed and the first and seventh 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 and eighth switches are disconnected, the power battery 100 enters a boost charging mode; if the second to fourth switches are closed and the first switch and the fifth to eighth switches are disconnected, the power battery 100 enters a battery self-heating mode; if the second to fifth switches are closed and the first switch and the sixth to eighth switches are disconnected, the power battery 100 enters a battery self-heating mode.

[0070] 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.

[0071] Specifically, when the system operates in direct fast charging mode, the system main circuit is as follows Figure 5 、 6 As shown, relays K2, K3, K4, K6, and K7 are closed, and relays K1, K5, and K8 are opened, and the external charging pile directly charges the power battery 100.

[0072] When the system works in boost mode, the main circuit of the system is as follows Figure 7As shown, close relays K2, K3, K4, K5, K8, and K6, and open relays K1 and K7. The inductor of the system is a configurable energy storage device. According to 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 8 、 9 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 10 As shown, power devices Q1, Q3, and Q5 are turned on, and the charging pile stores energy for the motor and inductor. Figure 11 As shown, 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.

[0073] 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 K4 and K8 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 13 As shown, power devices Q2, Q4, and Q6 are turned on, and the charging pile stores energy for the motor and inductor. Figure 14 As shown, 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 Q1, Q3, and Q5, thereby increasing the charging current.

[0074] When the system is working in heating mode, if Figure 15 、 16 , 17 working modes, the system main circuit is as follows Figure 15 As shown, disconnect relays K1, K5, K6, K8, and K7, and close relays K2, K3, and K4. The system's motor inductance energy storage device, such as Figure 16 As shown, the power devices Q1, Q6, or Q1, Q4 or Q3, Q6 or Q2, Q3 or Q4, Q5 or Q2, Q5 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 17As shown, Q1, Q6, or Q1, Q4 or Q3, Q6 or Q2, Q3 or Q4, Q5 or Q2, Q5 are turned off, and the motor inductance energy storage reversely charges the power battery 100 through the body diode of the power device to form a pulse AC, and the self-heating function of the pulsed battery is realized by controlling the opening frequency and duty cycle.

[0075] 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 Q2, Q4, and Q6, 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 Q2, Q4, and Q6. 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 Q1, Q3, and Q5 to charge the battery, as shown in FIG. Figure 21 Turn on Q1, Q3, and Q5 to transfer the energy of the capacitor to the inductor, and turn off Q1, Q3, and Q5. 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.

[0076] According to the electric vehicle boost and current-increasing charging and battery self-heating system with a common positive bus proposed in the embodiment of the present application, the positive poles of the power battery, drive system and charging port are all connected to the same positive bus, and the negative poles are connected to multiple negative bus bars to build a unified power supply structure. Under this structure, the drive system can boost the external charging voltage and increase the charging current, and can heat the power battery to improve the working performance in a low-temperature environment. The system also includes a switch assembly composed of multiple switches, and the switches are distributed in the power supply link between the power battery, drive system and charging port. By controlling the on-off state of each switch, it is possible to flexibly switch into multiple modes such as direct fast charging, boost charging, current-increasing charging and battery self-heating to meet the charging and heating requirements in different usage scenarios, thereby solving the problem that electric vehicles in the related art cannot adapt to multi-voltage charging piles.

[0077] An embodiment of the present application also provides an electric vehicle, including an electric vehicle boost and current charging and battery self-heating system with a common positive bus.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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 bus electric vehicle boost current charging and battery self-heating system, characterized in that: include: A power battery, a drive system, and a 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, and the negative electrode of the power battery, the drive system, and the negative electrode of the charging port are connected to multiple negative busbars, and the drive system is used to boost the charging voltage, boost the charging current, and 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, the power battery is controlled to enter at least one mode of direct fast charging mode, boost charging mode, boost current charging mode and battery self-heating mode.

2. The electric vehicle boost and current charging and battery self-heating system with a common positive bus 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 boost and current charging and battery self-heating system with a common positive bus according to claim 1 is characterized in that: The inverter includes multiple power devices.

4. The electric vehicle boost and current charging and battery self-heating system with a common positive bus according to claim 1 is characterized in that: Also includes: 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 electric vehicle boost and current charging and battery self-heating system with a common positive bus according to claim 4 is characterized in that: The switch assembly includes first to eighth 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 and one end of the eighth switch, the other end of the eighth 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 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 electric vehicle boost and current charging and battery self-heating system with a common positive bus according to claim 5 is characterized in that: The other end of the inductor is connected to one end of the fifth switch, the other end of the fifth switch is respectively connected to the other end of the first switch, one end of the eighth switch and one end of the second capacitor, and the other end of the second capacitor is respectively connected to the other end of the second switch and one end of the sixth switch.

7. The electric vehicle boost and current charging and battery self-heating system with a common positive bus according to claim 5 is characterized in that: The other end of the inductor is respectively connected to the other end of the first switch, one end of the eighth switch and one end of the second capacitor, the other end of the second capacitor is connected to one end of the fifth switch, and the other end of the fifth switch is respectively connected to the other end of the second switch and one end of the sixth switch.

8. The electric vehicle boost and current charging and battery self-heating system with a common positive bus according to claim 5 is characterized in that: If the second to seventh switches are closed and the first, fifth and eighth switches are disconnected, the power battery enters the direct fast charging mode; if the second to sixth switches and the eighth switch are closed and the first and seventh switches 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 and eighth switches are disconnected, the power battery enters the boost charging mode; if the second to fourth switches are closed and the first switch and the fifth to eighth switches are disconnected, the power battery enters the battery self-heating mode; if the second to fifth switches are closed and the first switch and the sixth to eighth switches are disconnected, the power battery enters the battery self-heating mode.

9. The electric vehicle boost and current charging and battery self-heating system with a common positive bus according to claim 5 is characterized in that: The first to eighth switches are relays.

10. An electric vehicle, characterized in that: An electric vehicle voltage- and current-boosting charging and battery self-heating system comprising the common positive bus described in any one of claims 1 to 9.

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