High voltage charging system, method and electric vehicle

Abstract

The application relates to the technical field of vehicles, in particular to a high-voltage charging system and method and an electric vehicle, wherein the system comprises a charging port and a power battery; an electric drive assembly, wherein the electric drive assembly comprises an inverter and a motor, the inverter is connected to the connection loop of the charging port and the power battery, and the motor is allowed to be connected to the charging port; and a control assembly for controlling the electric drive assembly to be connected to the charging port during a charging process, and at least one of voltage boosting, current boosting and heating of the charging process is realized by using the electric drive assembly. Therefore, the current electric vehicle charging architecture can be prevented from being unable to match a charging pile during actual charging, the vehicle cannot be charged, 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 is limited by the charging interface, and the maximum charging current cannot be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a high-voltage charging system, method and electric vehicle. BACKGROUND

[0002] With the rapid development of the electric vehicle market, the construction of charging infrastructure is also advancing. However, in practical applications, the compatibility problem between electric vehicles and charging piles is increasingly prominent, becoming one of the key factors affecting user experience. The charging piles on the current market are mainly divided into 500V, 750V and 1000V three voltage levels, which reflects the different understanding and implementation strategies of different manufacturers for fast charging technology. The power battery voltage platform of electric vehicles is usually distributed within these intervals, such as 500 to 750V or 750 to 1000V.

[0003] When an electric vehicle attempts to charge using a charging pile with a voltage lower than its battery voltage range, due to the problem of voltage mismatch, it may cause the vehicle to be unable to start the charging process normally. For example, if an electric vehicle designed for a working range of 750V to 1000V is connected to a charging pile that can only provide 500V output, the vehicle may not be able to accept any power input at all. Conversely, even if a high-voltage charging pile can support low-voltage vehicle charging, due to the limitations of the charging interface and the vehicle's on-board system, the actual charging efficiency is often greatly reduced, and the maximum charging current cannot be achieved, thereby prolonging the charging time and reducing the convenience and satisfaction of users.

[0004] As Figure 1 The high-voltage architecture of a typical pure electric vehicle is shown: K2 is the main positive relay of the battery pack, K4 is the main negative relay of the battery pack, K3 is the pre-charge relay, K6 is the fast-charge positive relay, K7 is the fast-charge negative relay, R1 is the pre-charge resistor, Q1, Q2, Q3, Q4, Q5, Q6 are motor controller power devices, and C1 is the bus capacitor of the motor controller. The current electric vehicle charging architecture will encounter situations where it cannot match the charging pile during actual charging, resulting in the vehicle being unable to charge. There are 500V, 750V and 1000V charging piles on the current market. When the voltage platform of the power battery of an electric vehicle is in the 500 to 750V or 750 to 1000V interval, there is a problem that low-voltage charging piles cannot charge high-voltage vehicles, or when high-voltage piles charge low-voltage vehicles, they are limited by the charging interface and cannot achieve the maximum charging current. SUMMARY

[0005] The application provides a high-voltage charging system, method and electric vehicle to solve the problem that the current electric vehicle charging architecture cannot match the charging pile in actual charging, resulting in that the vehicle cannot be charged, and the low-voltage charging pile cannot charge the high-voltage vehicle, or the high-voltage pile charges the low-voltage vehicle, which is limited by the charging interface and cannot achieve the maximum charging current.

[0006] The first aspect of the application provides a high-voltage charging system, comprising the following steps: a charging port and a power battery; an electric drive assembly, wherein the electric drive assembly comprises an inverter and a motor, the inverter is connected to the connection loop of the charging port and the power battery, and the motor is allowed to be connected to the charging port; a control assembly for controlling the electric drive assembly to be connected to the charging port during the charging process, and at least one of voltage boosting, current boosting and heating is realized by using the electric drive assembly.

[0007] Optionally, the control assembly comprises first to ninth switches, a resistor, an inductor and first to second capacitors, wherein one end of the first switch is connected to the positive electrode of the power battery, the other end of the first switch is connected to one end of the fifth switch and one end of the inductor, the motor is connected to one end of the inductor, the other end of the fifth switch is connected to the positive electrode of the second capacitor and one end of the ninth switch respectively, the other end of the ninth switch is connected to the positive electrode of the charging port, one end of the second switch is connected to one end of the third switch and the positive electrode of the power battery respectively, the other end of the second switch is connected to one end of the resistor, the positive electrode of the first capacitor and one end of the sixth switch respectively, 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 the other end of the resistor, one end of the fourth switch is connected to the negative electrode of the power battery, the other end of the fourth resistor is connected to the negative electrode of the first capacitor, the negative electrode of the second capacitor and one end of the seventh switch respectively, the other end of the seventh switch is connected to the negative electrode of the charging port.

[0008] Optionally, the first to ninth switches are relays.

[0009] Optionally, the turn-off of the first to ninth switches realizes the first to fourth modes, and the inverter comprises first to sixth power devices.

[0010] Optionally, if the target mode of the electric vehicle is the first mode, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, and the first switch, the fifth switch and the ninth switch are opened, and the charging pile charges the power battery.

[0011] Optionally, if the target mode of the electric vehicle is the second mode, the first switch, the sixth switch and the eighth switch are opened, the second to fifth switches, the seventh switch and the ninth switch are closed, the voltage of the power battery is converted into the first preset voltage through the switching state of the first power device, the third power device and the fifth power device, the voltage of the second capacitor is maintained as the chargeable voltage of the charging pile by using the motor and the inductor to store and release energy, the second power device, the fourth power device and the sixth power device are closed to store energy for the motor and the inductor, the second power device, the fourth power device and the sixth power device are closed after the energy storage is completed, the energy of the inductor and the charging pile is superimposed to charge the power battery through the first power device, the third power device and the fifth power device, so as to increase the charging voltage.

[0012] Optionally, if the target mode of the electric vehicle is the third mode, after the voltage of the second capacitor is charged to the second preset voltage, the second switch, the third switch, the eighth switch and the ninth switch are opened, the first switch and the fourth to seventh switches are closed, the first power device, the third power device and the fifth power device are closed, the charging pile stores energy for the motor and the inductor, the first power device, the third power device and the fifth power device are opened after the energy storage is completed, the energy of the inductor and the charging pile is superimposed to charge the power battery through the second power device, the fourth power device and the sixth power device, so as to increase the charging current.

[0013] Optionally, if the target mode of the electric vehicle is the fourth mode, the first switch, the fifth to seventh switches and the ninth switch are opened, the second to fourth switches and the eighth switch are closed, the first power device, the third power device and the fifth power device are closed, the upper half module of the power battery stores energy for the motor and the inductor, the first power device, the third power device and the fifth power device are closed after the energy storage is completed, the motor and the inductor charge the lower half module of the power battery, and the body diode of the second power device, the fourth power device and the sixth power device forms an energy loop, the second power device, the fourth power device and the sixth power device are opened, the lower half module of the power battery stores energy for the motor and the inductor, the second power device, the fourth power device and the sixth power device are closed after the energy storage is completed, the energy of the motor and the inductor charges the upper half module of the power battery through the first power device, the third power device and the fifth power device, and the frequency and duty cycle of the control opening are controlled to realize the self-heating of the power battery in a pulse mode.

[0014] The second aspect embodiment of the application provides an electric vehicle comprising the high-voltage charging system of the first aspect.

[0015] The third aspect of the present application provides a high-voltage charging method, which uses the high-voltage charging system of the first aspect to charge, wherein the method comprises the following steps: identifying a target mode of the power battery; controlling the closing and opening of the switches in the control assembly of the high-voltage charging system according to the target mode, and forming a target loop corresponding to the target mode through the closing and opening of the switches in the control assembly; and realizing at least one of voltage boosting, current boosting and heating in the charging process based on the target loop.

[0016] Therefore, the present application has at least the following beneficial effects:

[0017] The embodiments of the present application include a charging port and a power battery, an electric drive assembly and a control assembly. In the electric drive assembly, an inverter and a motor are included, the inverter is connected to the connection loop of the charging port and the power battery, and the motor is allowed to be connected to the charging port. The electric drive assembly is controlled by the control assembly to be connected to the charging port in the charging process, at least one of voltage boosting, current boosting and heating in the charging process is realized by using the electric drive assembly, the self-heating of the power battery is realized, the heating rate and temperature consistency of the power battery are improved, and the lifting function is realized by composite use of the electric drive system, that is, the voltage boosting charging, voltage reducing charging and direct charging can be realized. Therefore, the problem that the current electric vehicle charging architecture cannot match the charging pile in actual charging, resulting in that the vehicle cannot be charged, and the problem that the low-voltage charging pile cannot charge the high-voltage vehicle, or the high-voltage pile charges the low-voltage vehicle, which is limited by the charging interface and cannot achieve the maximum charging current, are solved.

[0018] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A structural schematic diagram of a high-voltage charging system provided by the related art is provided;

[0021] Figure 2 A structural schematic diagram of a high-voltage charging system provided by the embodiments of the present application is provided;

[0022] Figure 3 An example diagram of a voltage boosting and current boosting heating system scheme of an electric drive system provided by an embodiment of the present application is provided;

[0023] Figure 4 A system diagram when direct fast charging is provided by an embodiment of the present application;

[0024] Figure 5The system main circuit diagram of the boost charging mode according to an embodiment of the application is provided;

[0025] Figure 6 The charging start stage circuit schematic diagram of the boost charging mode according to an embodiment of the application is provided;

[0026] Figure 7 The boost charging mode buck mode circuit schematic diagram according to an embodiment of the application is provided;

[0027] Figure 8 The circuit schematic diagram of the charging pile for motor and inductance energy storage in the boost charging mode according to an embodiment of the application is provided;

[0028] Figure 9 The schematic diagram of the energy superposition of inductance energy storage and the charging pile for charging the power battery and improving the charging voltage according to an embodiment of the application is provided;

[0029] Figure 10 The system main circuit diagram of the boost charging mode according to an embodiment of the application is provided;

[0030] Figure 11 The circuit schematic diagram of the charging pile for motor and inductance energy storage in the boost charging mode according to an embodiment of the application is provided;

[0031] Figure 12 The schematic diagram of the energy superposition of inductance energy storage and the charging pile for charging the power battery and improving the charging current according to an embodiment of the application is provided;

[0032] Figure 13 The system main circuit diagram of the battery heating mode according to an embodiment of the application is provided;

[0033] Figure 14 The circuit schematic diagram of the upper half module group battery for motor and inductance energy storage according to an embodiment of the application is provided;

[0034] Figure 15 The circuit schematic diagram of the motor and inductance energy storage for charging the lower half module group battery according to an embodiment of the application is provided;

[0035] Figure 16 The circuit schematic diagram of the lower half module group battery for motor and inductance energy storage according to an embodiment of the application is provided;

[0036] Figure 17 The circuit schematic diagram of the inductance energy storage for charging the upper half module group battery and realizing the self-heating function according to an embodiment of the application is provided;

[0037] Figure 18 The flow schematic diagram of the high-voltage charging method according to an embodiment of the application is provided. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0039] A high-voltage charging system, method and electric vehicle of embodiments of the present application are described below with reference to the drawings. In view of the fact that the current electric vehicle charging architecture mentioned in the background art will encounter the situation that the charging pile cannot be matched during actual charging, resulting in the vehicle being unable to charge, and the fact that the low-voltage charging pile cannot charge the high-voltage vehicle, or when the high-voltage pile charges the low-voltage vehicle, the limited charging interface restricts the maximum charging current, etc., the present application provides a high-voltage charging system, in which the system includes a charging port and a power battery, an electric drive assembly and a control assembly, in the electric drive assembly, an inverter and a motor are included, the inverter is connected to the connection loop of the charging port and the power battery, and the motor is allowed to be connected to the charging port. The control assembly controls the connection of the electric drive assembly to the charging port during the charging process, at least one of voltage boosting, current boosting and heating during the charging process is realized by using the electric drive assembly, self-heating of the power battery is realized, the heating rate and temperature consistency of the power battery are improved, and the lifting function is realized by composite use of the electric drive system, that is, voltage boosting charging, voltage reducing charging and direct charging can be realized. Thus, the current electric vehicle charging architecture mentioned in the background art will encounter the situation that the charging pile cannot be matched during actual charging, resulting in the vehicle being unable to charge, and the fact that the low-voltage charging pile cannot charge the high-voltage vehicle, or when the high-voltage pile charges the low-voltage vehicle, the limited charging interface restricts the maximum charging current, etc.

[0040] Specifically, Figure 2 A flowchart of a high-voltage charging system provided by embodiments of the present application is shown.

[0041] As Figure 2 shown, the high-voltage charging system includes a charging port 101, a power battery 102, an electric drive assembly 103, an inverter 104, a motor 105 and a control assembly 106.

[0042] The charging port 101 and the power battery 102; the electric drive assembly 103, wherein the electric drive assembly 103 includes the inverter 104 and the motor 105, the inverter 104 is connected to the connection loop of the charging port 101 and the power battery 102, and the motor 105 is allowed to be connected to the charging port 101; the control assembly 106 is used to control the connection of the electric drive assembly 103 to the charging port 101 during the charging process, and at least one of voltage boosting, current boosting and heating during the charging process is realized by using the electric drive assembly 103.

[0043] It can be understood that the embodiments of the present application include a charging port 101, a power battery 102, an electric drive assembly 103, an inverter 104, a motor 105 and a control assembly 106. The charging port 101 is connected with the power battery 102, and the electric drive assembly 103 is also integrated. The electric drive assembly 103 is composed of the inverter 104 and the motor 105. The inverter 104 is connected between the charging port 101 and the power battery 102, and the motor 105 has the ability to be directly connected with the charging port 101. Through the control and management of the control assembly 106, the working state of the electric drive assembly 103 can be flexibly controlled during the charging process, so that it can perform at least one function of the operations such as boosting, boosting current or heating the battery, thereby optimizing the charging efficiency and ensuring the battery performance.

[0044] In the embodiments of the present application, the control assembly 106 includes first to ninth switches, resistors, inductors and first to second capacitors. One end of the first switch is connected with the positive electrode of the power battery 102, and the other end of the first switch is connected with one end of the fifth switch and one end of the inductor. The motor 105 is connected with one end of the inductor. The other end of the fifth switch is connected with the positive electrode of the second capacitor and one end of the ninth switch, respectively. The other end of the ninth switch is connected with the positive electrode of the charging port 101. One end of the second switch is connected with one end of the third switch and the positive electrode of the power battery 102, respectively. The other end of the second switch is connected with one end of the resistor, the positive electrode of the first capacitor and one end of the sixth switch, respectively. The other end of the sixth switch is connected with the positive electrode of the charging port 101. The other end of the third switch is connected with the other end of the resistor. One end of the fourth switch is connected with the negative electrode of the power battery 102. The other end of the fourth resistor is connected with the negative electrode of the first capacitor, the negative electrode of the second capacitor and one end of the seventh switch, respectively. The other end of the seventh switch is connected with the negative electrode of the charging port 101.

[0045] It can be understood that the control component 106 of the embodiment of the application integrates the first to ninth switches, resistors, inductors, and first and second capacitors. Specifically, one end of the first switch is connected to the positive pole of the power battery 102, and the other end is connected to one end of the fifth switch and one end of the inductor. The motor 105 is also connected to one end of the inductor. The other end of the fifth switch is connected to the positive pole of the second capacitor and one end of the ninth switch, and the other end of the ninth switch is finally connected to the positive pole of the charging port 101. At the same time, one end of the second switch is connected to one end of the third switch and the positive pole of the power battery 102, and the other end is connected to one end of the resistor, the positive pole of the first capacitor, and one end of the sixth switch, and the sixth switch is directly connected to the positive pole of the charging port 101. The other end of the third switch is connected to the other end of the resistor. One end of the fourth switch is connected to the negative pole of the power battery 102, and the other end is connected to the negative pole of the first capacitor, the negative pole of the second capacitor, and one end of the seventh switch. The other end of the seventh switch is connected to the negative pole of the charging port 101. Through the cooperative work of these switches and elements, the control component 106 can flexibly adjust the circuit state to effectively control the functions such as voltage boosting, current boosting, or heating during charging.

[0046] In the embodiment of the application, the first to ninth switches are relays. Specifically, the first switch is a current-boosting charging relay, the second switch is a main positive relay, the third switch is a pre-charging relay, the fourth switch is a main negative relay, the fifth switch is a filter capacitor relay, the sixth switch is a fast-charging positive relay, the seventh switch is a fast-charging negative relay, the eighth switch is a self-heating relay, and the ninth switch is a voltage-boosting relay.

[0047] It can be understood that the first to ninth switches of the embodiment of the application are relays, and the types of the relays of each switch are not the same. Specifically, the first switch is a current-boosting charging relay, the second switch is a main positive relay, the third switch is a pre-charging relay, the fourth switch is a main negative relay, the fifth switch is a filter capacitor relay, the sixth switch is a fast-charging positive relay, the seventh switch is a fast-charging negative relay, the eighth switch is a self-heating relay, and the ninth switch is a voltage-boosting relay.

[0048] In the embodiment of the application, the turn-off of the first to ninth switches realizes the first to fourth modes, and the inverter 104 includes first to sixth power devices.

[0049] Specifically, the first to fourth modes are a direct fast-charging mode, a voltage-boosting charging mode, a current-boosting charging mode, and a battery heating mode, respectively. The power devices are motor controller power devices.

[0050] It can be understood that the inverter 104 of the embodiment of the application includes first to sixth power devices, and the turn-off of the first to ninth switches realizes the switching of the direct fast-charging mode, the voltage-boosting charging mode, the current-boosting charging mode, and the battery heating mode.

[0051] In the embodiment of the present application, if the target mode of the electric vehicle is the first mode, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, the first switch, the fifth switch and the ninth switch are opened, and the charging pile charges the power battery 102.

[0052] It can be understood that, if the target mode of the electric vehicle is the first mode, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed in the embodiment of the present application, and the other switches are opened. In this configuration, the charging pile directly charges the power battery 102. Specifically, the current path is from the positive electrode of the charging pile to the positive electrode of the power battery 102 through the fast-charging positive relay and the main positive relay; at the same time, the current from the negative electrode of the power battery 102 returns to the negative electrode of the charging pile through the main negative relay and the fast-charging negative relay, forming a complete charging loop.

[0053] In the embodiment of the present application, if the target mode of the electric vehicle is the second mode, the first switch, the sixth switch and the eighth switch are opened, the second to fifth switches, the seventh switch and the ninth switch are closed, the voltage of the power battery 102 is converted into the first preset voltage through the switching state of the first power device, the third power device and the fifth power device, the voltage of the second capacitor is maintained as the acceptable voltage of the charging pile by using the motor 105 and the energy storage and release of the inductor, the second power device, the fourth power device and the sixth power device are closed to store energy for the motor 105 and the inductor, the second power device, the fourth power device and the sixth power device are closed after the energy storage is completed, and the energy of the inductor and the charging pile is superimposed to charge the power battery 102 through the first power device, the third power device and the fifth power device, so as to improve the charging voltage.

[0054] The first preset voltage is set according to specific conditions, which is not limited here.

[0055] It can be understood that, if the target mode of the electric vehicle is the second mode, the first switch, the sixth switch and the eighth switch are opened in the embodiment of the present application, and the other switches are closed. The voltage of the power battery 102 is converted into the first preset voltage by controlling the switching state of the first power device, the third power device and the fifth power device, the voltage of the second capacitor is maintained as the acceptable voltage of the charging pile by using the motor and the energy storage and release of the inductor, the motor can store energy by closing the second power device, the fourth power device and the sixth power device, the second power device, the fourth power device and the sixth power device are closed after the energy storage of the inductor is completed, the energy storage process is stopped, the energy stored in the inductor is superimposed with the energy provided by the charging pile, and the power battery 102 is charged through the first power device, the third power device and the fifth power device, so that even if the voltage provided by the charging pile is low, a higher charging voltage can be achieved.

[0056] In this embodiment, if the target mode of the electric vehicle is the third mode, after charging the voltage of the second capacitor to the second preset voltage, the second switch, the third switch, the eighth switch and the ninth switch are disconnected, the first switch and the fourth to seventh switches are closed, and the first power device, the third power device and the fifth power device are closed. The charging pile is the motor 105 and the inductor energy storage. After the energy storage is completed, the first power device, the third power device and the fifth power device are disconnected. The energy of the inductor energy storage and the charging pile is superimposed and used to charge the power battery 102 through the second power device, the fourth power device and the sixth power device to increase the charging current.

[0057] The second preset voltage is set according to specific circumstances and is not specifically limited here.

[0058] Understandably, if the target mode of the electric vehicle is the third mode, the embodiment of this application will charge the second capacitor to a predetermined second preset voltage value, then disconnect the second, third, eighth, and ninth switches, and close the first, fourth, fifth, sixth, and seventh switches, while simultaneously closing the first, third, and fifth power devices, allowing the energy of the charging pile to be stored through the motor 105 and the inductor. When the inductor has finished storing energy, the first, third, and fifth power devices will be disconnected. Finally, through the second, fourth, and sixth power devices, the energy stored in the inductor will be combined with the energy provided by the charging pile, and together they will act on the power battery 102 to increase the charging current.

[0059] In this embodiment, if the target mode of the electric vehicle is the fourth mode, the first switch, the fifth to seventh switches and the ninth switch are disconnected, the second to fourth switches and the eighth switch are closed, and the first power device, the third power device and the fifth power device are closed. The upper half of the power battery 102 is for energy storage by the motor 105 and the inductor. After energy storage is completed, the first power device, the third power device and the fifth power device are turned off. The energy stored by the motor 105 and the inductor charges the lower half of the power battery 102 and forms an energy circuit through the body diodes of the second power device, the fourth power device and the sixth power device. The second power device, the fourth power device and the sixth power device are turned on. The lower half of the power battery 102 is for energy storage by the motor 105 and the inductor. After energy storage is completed, the second power device, the fourth power device and the sixth power device are turned off. The energy stored by the motor 105 and the inductor charges the upper half of the power battery 102 through the first power device, the third power device and the fifth power device. The power battery 102 achieves pulse-type self-heating by controlling the frequency and duty cycle of the turn-on.

[0060] It can be understood that if the target mode of the electric vehicle is the fourth mode, the first switch, the fifth to seventh switches and the ninth switch are opened, the second to fourth switches and the eighth switch are closed, and then the first, third and fifth power devices are closed. At this time, the upper half module of the power battery 102 starts to store energy for the motor 105 and the inductor, and immediately closes the first, third and fifth power devices after the energy storage is completed. Subsequently, the energy stored in the motor 105 and the inductor forms an energy loop through the body diode of the second, fourth and sixth power devices to charge the lower half module of the power battery 102. In this process, the second, fourth and sixth power devices are turned on to achieve effective energy transmission. Next, the lower half module of the power battery 102 stores energy for the motor 105 and the inductor again, and after the energy storage is completed, the second, fourth and sixth power devices are closed. Finally, the energy stored in the motor 105 and the inductor charges the upper half module of the power battery 102 through the first, third and fifth power devices, realizing the pulse type self-heating of the power battery 102, thereby improving the battery temperature and optimizing the performance under low temperature conditions.

[0061] The high-voltage charging system according to the embodiment of the present application includes a charging port and a power battery, an electric drive assembly and a control assembly. In the electric drive assembly, an inverter and a motor are included. The inverter is connected to the connection loop of the charging port and the power battery, and the motor is allowed to be connected to the charging port. The control assembly controls the connection of the electric drive assembly to the charging port during the charging process. At least one of the voltage boosting, current boosting and heating functions of the charging process is realized by using the electric drive assembly, thereby realizing the self-heating of the power battery, improving the heating rate and temperature consistency of the power battery, and realizing the composite use of the electric drive system to realize the lifting function, i.e. the voltage boosting charging, voltage reducing charging and direct charging.

[0062] The high-voltage charging system will be further described below through a specific embodiment. As shown in Figure 3 The electric drive system voltage boosting, current boosting and heating system includes a main positive relay K2, a pre-charging relay K3, a pre-charging resistor R1, a main negative relay K4, a fast charging positive relay K6, a fast charging negative relay K7, a current boosting charging relay K1, a filter capacitor relay K5, a voltage boosting relay K9, a self-heating relay K8, a motor controller bus capacitor C1, motor controller power devices Q1, Q2, Q3, Q4, Q5 and Q6, and a charging filter capacitor C2.

[0063] The embodiment is divided into direct fast charging mode, voltage boosting charging mode, current boosting charging mode and battery self-heating mode according to the specific state of the charging pile. The implementation of the four modes will be described respectively as follows.

[0064] I. Direct fast charging mode

[0065] As shown in Figure 4As shown, the system diagram of the direct fast charging mode, K2, K3, K4, K6, K7 are closed; K1, K5, K9 are disconnected, and the external charging pile directly charges the power battery.

[0066] II. Boost charging mode

[0067] When the system works in boost mode, K1, K6, K8 are disconnected, and the system main circuit is as shown in Figure 5 . At this time, the relays K2, K3, K4, K5, K9, K7 are closed; the inductance of the system is a configurable energy storage device, which can be cancelled according to the actual effect. After starting charging, due to the charging initiation stage, the charging needs to detect the voltage platform of the vehicle, so at the beginning of charging, the system is in the step-down mode, charging C2 capacitor to provide a voltage that the charging pile can accept. The specific steps are as shown in Figure 6 , Figure 7 . By controlling the switching states of Q1, Q3, Q5, the voltage of the high-voltage battery pack is converted to low voltage, and the motor, inductance energy storage and release are used to maintain the voltage of the capacitor as a ground voltage that the charging pile can accept.

[0068] As shown in Figure 8 , close the power devices Q4, Q2, Q6, and the charging pile is energized. After the energy storage is completed, Q4, Q2, Q6 are closed as shown in Figure 9 . The energy of the inductance energy storage and the charging pile is superimposed through Q1, Q3, Q5 to charge the power battery, realizing the boost of the charging voltage.

[0069] III. Boost current charging mode

[0070] When the system works in boost current mode, in the starting stage, the steps of Figure 6 , Figure 7 are adopted. After charging the voltage of the capacitor C2 to close to the voltage of the battery pack, K2, K3, K8, K9 are disconnected, and the system main circuit is as shown in Figure 10 . At this time, the relays K1, K4, K5, K6, K7 are closed; the inductance of the system is a configurable energy storage device, which can be cancelled according to the actual effect. After starting charging, as shown in Figure 11 , close the power devices Q1, Q3, Q5, and the charging pile is energized. After the energy storage is completed, Q1, Q3, Q5 are closed as shown in Figure 12 . The energy of the inductance energy storage and the charging pile is superimposed through Q2, Q4, Q6 to charge the power battery, realizing the boost of the charging current.

[0071] IV. Battery self-heating mode

[0072] When the system works in heating mode, K1, K5, K6, K9, K7 are disconnected, and the system main circuit is as shown in Figure 13As shown. At this time, relays K2, K4, K3, and K8 are closed; the system inductor is a configurable energy storage device. Depending on the actual effect, the inductor can be removed. After charging begins, as shown... Figure 14 As shown, closed power devices Q1, Q3, and Q5 are used. The upper module battery stores energy for the motor and inductor. After energy storage is complete, as follows... Figure 15 As shown, when Q1, Q3, and Q5 are turned off, the motor and inductor store energy to charge the battery of the lower half-module, and form an energy loop through the body diodes Q2, Q4, and Q6; as shown Figure 16 As shown, Q2, Q4, and Q6 are activated. The lower half of the module's battery stores energy for the motor and inductor. After energy storage is complete, as follows... Figure 17 As shown, when Q2, Q4, and Q6 are turned off, the energy stored in the motor and inductor charges the upper module battery through Q1, Q3, and Q5. The self-heating function of the pulse battery is achieved by controlling the frequency and duty cycle of the switching on.

[0073] Next, the high-voltage charging method proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0074] Figure 18 This is a flowchart illustrating the high-voltage charging method according to an embodiment of this application.

[0075] like Figure 18 As shown, the high-voltage charging method includes the following steps:

[0076] In step S201, the target mode of the power battery is identified.

[0077] The target modes for power batteries include direct fast charging mode, boost charging mode, boost current charging mode, and battery heating mode.

[0078] It is understood that the embodiments of this application can identify the target mode of the power battery and determine that the target mode is one of the following: direct fast charging mode, boost charging mode, boost current charging mode, or battery heating mode.

[0079] In step S202, the switches in the control component of the high-voltage charging system are closed and opened according to the target mode, and the target circuit corresponding to the target mode is formed by the closing and opening of the switches in the control component.

[0080] It is understood that the embodiments of this application can control the closing and opening of each switch in the high-voltage charging system to form the required target circuit for different target modes, and realize different charging modes through the target circuit.

[0081] In step S203, at least one of the following is achieved in the charging process: voltage boosting, current boosting, and heating, based on the target circuit.

[0082] It can be understood that, by controlling the closing and opening of each switch in the high-voltage charging system, the target loop required can be formed, and the functions of voltage boosting, current boosting and heating during the charging process can be realized.

[0083] It should be noted that the foregoing explanation and description of the high-voltage charging system embodiment also applies to the high-voltage charging method of the embodiment, which will not be described here.

[0084] According to the high-voltage charging method provided in the embodiment of the application, by identifying the target mode of the power battery, the closing and opening of the switch in the control assembly of the high-voltage charging system are controlled, the target loop corresponding to the target mode is formed, at least one of the functions of voltage boosting, current boosting and heating during the charging process is realized based on the target loop, the self-heating of the power battery is realized, the heating rate and temperature consistency of the power battery are improved, and the composite use of the electric drive system to realize the boosting and reducing functions is realized, that is, the functions of voltage boosting charging, voltage reducing charging and direct charging can be realized.

[0085] The embodiment of the application also provides an electric vehicle comprising the high-voltage charging system described above.

[0086] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a 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 the present specification, the illustrative description of the above terms is not necessarily for 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, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0087] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0088] Any process or method described in a flowchart or otherwise described herein can be understood as representing a module, segment, or portion of code that includes one or more executable instructions for implementing the specified logical functions or steps, and the preferred embodiments of the application include additional or fewer steps, or combinations of steps, or the order of the steps can be different from those shown or discussed. It is intended that additional or fewer steps be performed between any two steps, and one of ordinary skill in the art would recognize many variations based on the functionality described.

[0089] It is to be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, the steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, or a combination thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays, field programmable gate arrays, and the like.

[0090] Those of ordinary skill in the art can understand that all or part of the steps carried out by the above-mentioned embodiments can be completed by programs instructing relevant hardware, and the programs can be stored in a computer readable storage medium. When the programs are executed, they include one or a combination of the steps of the method embodiments.

Claims

1. A high-voltage charging system, characterized in that, include: Charging port and power battery; An electric drive assembly, wherein the electric drive assembly includes an inverter and a motor, the inverter is connected to the connection circuit of the charging port and the power battery, and the motor is allowed to be connected to the charging port; A control component is used to control the connection of the electric drive assembly to the charging port during the charging process, and to utilize the electric drive assembly to achieve at least one of voltage boosting, current boosting, and heating during the charging process. The control component includes first to ninth switches, a resistor, an inductor, and first to second capacitors. One end of the first switch is connected to the positive terminal of the power battery, and the other end of the first switch is connected to one end of the fifth switch and one end of the inductor. The motor is connected to one end of the inductor. The other end of the fifth switch is connected to the positive terminal of the second capacitor and one end of the ninth switch, respectively. The other end of the ninth switch is connected to the positive terminal of the charging port. One end of the second switch is connected to one end of the third switch and the positive terminal of the power battery, respectively. The other end of the second switch is connected to one end of the resistor, the positive terminal of the first capacitor, and one end of the sixth switch, respectively. The other end of the sixth switch is connected to the positive terminal of the charging port, and the other end of the third switch... One end of the fourth switch is connected to the other end of the resistor, one end of the fourth switch is connected to the negative terminal of the power battery, and the other end of the fourth resistor is connected to the negative terminal of the first capacitor, the negative terminal of the second capacitor, and one end of the seventh switch. The other end of the seventh switch is connected to the negative terminal of the charging port. The first to ninth switches are turned off to realize the first to fourth modes. If the target mode of the electric vehicle is the third mode, after charging the voltage of the second capacitor to the second preset voltage, the second, third, eighth, and ninth switches are turned off, the first switch and the fourth to seventh switches are turned on, and the first, third, and fifth power devices are turned on. The charging pile stores energy for the motor and the inductor. After the energy storage is completed, the first, third, and fifth power devices are turned off. The energy stored in the inductor and the energy of the charging pile are superimposed and used to charge the power battery through the second, fourth, and sixth power devices to increase the charging current.

2. The high-voltage charging system according to claim 1, characterized in that, The first to ninth switches are relays.

3. The high-voltage charging system according to claim 1, characterized in that, The inverter includes the first to sixth power devices.

4. The high-voltage charging system according to claim 3, characterized in that, If the target mode of the electric vehicle is the first mode, then the second, third, fourth, sixth and seventh switches are closed, and the first, fifth and ninth switches are opened, so that the charging pile can charge the power battery.

5. The high-voltage charging system according to claim 3, characterized in that, If the target mode of the electric vehicle is the second mode, then the first, sixth, and eighth switches are disconnected, and the second to fifth, seventh, and ninth switches are closed. Through the switching states of the first, third, and fifth power devices, the voltage of the power battery is converted to a first preset voltage. By utilizing the energy storage and release of the motor and inductor, the voltage of the second capacitor is maintained at a voltage acceptable to the charging pile. The second, fourth, and sixth power devices are closed to store energy for the motor and inductor. After the energy storage is completed, the second, fourth, and sixth power devices are closed. The energy stored in the inductor and the energy from the charging pile are superimposed and used to charge the power battery through the first, third, and fifth power devices to increase the charging voltage.

6. The high-voltage charging system according to claim 3, characterized in that, If the target mode of the electric vehicle is the fourth mode, the first switch, the fifth to seventh switches, and the ninth switch are disconnected, and the second to fourth switches and the eighth switch are closed. The first power device, the third power device, and the fifth power device are closed. The upper half of the power battery module stores energy for the motor and inductor. After energy storage is completed, the first power device, the third power device, and the fifth power device are turned off. The energy stored in the motor and inductor charges the lower half of the power battery module and forms an energy circuit through the body diodes of the second, fourth, and sixth power devices. The second power device, the fourth power device, and the sixth power device are turned on. The lower half of the power battery module stores energy for the motor and inductor. After energy storage is completed, the second power device, the fourth power device, and the sixth power device are turned off. The energy stored in the motor and inductor charges the upper half of the power battery module through the first, third, and fifth power devices. The power battery achieves pulse-type self-heating by controlling the frequency and duty cycle of the turn-on.

7. An electric vehicle, characterized in that, Includes the high-voltage charging system according to any one of claims 1-6.

8. A high-voltage charging method, characterized in that, The method utilizes the high-voltage charging system according to any one of claims 1-6 for charging, wherein the method includes the following steps: Identify the target mode of the power battery; The control component of the high-voltage charging system controls the opening and closing of switches according to the target mode, thereby forming a target circuit corresponding to the target mode through the opening and closing of switches in the control component. At least one of the following functions is achieved in the charging process: voltage boosting, current boosting, and heating, based on the target circuit.

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