Charging and discharging system of vehicle, vehicle and charging method of vehicle

By using switching and control components in electric vehicles to control the switching state, high-voltage charging from 800V to 1000V is achieved, which solves the problem of increased vehicle cost, improves charging power, balances battery pack voltage, and reduces vehicle power consumption.

CN120902569APending Publication Date: 2025-11-07BEIJING AUTOMOBILE RES GENERAL INST
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Patent Information

Application Number
CN202510872344.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-26
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

Existing high-voltage charging systems for electric vehicles increase the overall vehicle cost and suffer from increased power consumption and voltage imbalance due to differences in battery pack voltage.

Method used

By controlling the switch state according to the current vehicle mode through the switch assembly and control assembly, high-voltage charging from 800V to 1000V is achieved. The battery pack voltage is balanced by using motor control, thus avoiding changes to the high-voltage electrical components of the entire vehicle.

Benefits of technology

Without altering the vehicle's high-voltage electrical system, the charging power is increased, costs are reduced, and battery pack voltage consistency is improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to a charging and discharging system of a vehicle, the vehicle and a charging method of the vehicle, and the system comprises a switch assembly which has a plurality of switch states, and each switch state corresponds to the current mode of the vehicle; the energy storage device is electrically connected with the charging interface, one end of an inversion device of the vehicle and an electric appliance of the whole vehicle through a switch assembly, and the other end of the inversion device is electrically connected with a driving motor of the vehicle; the control assembly controls the switch assembly to be in the corresponding on-off state according to the current mode of the vehicle so as to charge the energy storage device through the charging interface at the first voltage or the second voltage or supply power to the whole vehicle electric appliance and the driving motor through the energy storage device. Therefore, the problem that a high-voltage system adopted by an existing automobile is high in cost is solved, on the premise that a high-voltage electric appliance of the whole automobile is not changed, 800V-1000V high-voltage charging is achieved, the charging power is improved, the cost is reduced, and the voltage balance of the battery pack is achieved through motor control and the motor.
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Description

TECHNICAL FIELD

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

[0002] In order to improve the charging power, the existing electric vehicle adopts a high-voltage system of 800V. However, the motor controller, on-board charger, DC / DC converter and air conditioner compressor, WTC heater and the like of the whole vehicle must adopt high-voltage power devices, which increases the cost of the whole vehicle. At present, some schemes adopt parallel connection of battery packs during driving and series connection during charging, so that the low-voltage power devices can be used for the high-voltage electrical appliances of the whole vehicle. However, there are problems. One scheme is shown in FIG. 1. After series connection, one of the battery packs Bat2 is used to supply power to the whole vehicle, so that there is a voltage difference between the two battery packs. When the battery Bat1 is fully charged, the battery Bat2 must be stopped from charging. When the two battery packs are in parallel connection, the voltage difference between the two battery packs needs to be isolated by a diode D1, which increases the power consumption of the whole vehicle during driving and is not conducive to reducing the driving power consumption of the whole vehicle. Another scheme is shown in FIG. 2. A DC / DC converter needs to be added to supply power to the high-voltage electrical appliances of the whole vehicle during series charging. This scheme solves the problem of voltage difference between the two battery packs, but increases the cost of the whole vehicle. Figure 1 Figure 2 SUMMARY

[0003] The present application provides a charging and discharging system of a vehicle, the vehicle and a charging method of the vehicle to solve the problem of increased cost of the whole vehicle caused by the high-voltage system adopted by the existing vehicle.

[0004] The first aspect of the present application provides a charging and discharging system of a vehicle, comprising: a switch assembly, the switch assembly having a plurality of switch states, each switch state corresponding to a current mode of the vehicle; an energy storage device, the energy storage device being electrically connected to a charging interface, one end of an inverter device of the vehicle and electrical appliances of the whole vehicle through the switch assembly, the other end of the inverter device being electrically connected to a driving motor of the vehicle; and a control assembly, the control assembly controlling the switch assembly to be in a corresponding switch state according to the current mode of the vehicle, so as to charge the energy storage device through the charging interface at a first voltage or a second voltage, or supply power to the electrical appliances of the whole vehicle and the driving motor through the energy storage device.

[0005] Optionally, the current mode is any one of a high-voltage charging mode, a low-voltage charging mode and a driving mode.

[0006] ​​Optionally, the switch assembly comprises: a resistor, first to eleventh switches, wherein one end of the first switch is connected to one end of the fifth switch, the other end of the first switch is connected to a positive output end of the whole vehicle; one end of the second switch is connected to one end of the resistor, the other end of the second switch is connected to the positive output end of the whole vehicle; the other end of the resistor is connected to one end of the first switch and one end of the fifth switch respectively; one end of the third switch is connected to a positive end of the charging interface, the other end of the third switch is connected to the energy storage device; one end of the fourth switch is connected to a negative end of the charging interface, the other end of the fourth switch is connected to the energy storage device; the other end of the fifth switch is connected to one end of the sixth switch and the energy storage device respectively; the other end of the sixth switch is connected to the energy storage device and one end of the seventh switch respectively; one end and the other end of the seventh switch are both connected to the energy storage device; one end of the eighth switch is connected to one end of the energy storage device, the other end of the eighth switch is connected to a connection node between the first switch and the fifth switch; one end of the ninth switch is connected to the energy storage device, the other end of the ninth switch is connected to an inverter device; one end of the tenth switch is connected to a connection node between the ninth switch and the inverter device, the other end of the tenth switch is connected to the positive output end of the whole vehicle; one end of the eleventh switch is connected to the driving motor, the other end of the eleventh switch is connected to the positive output end of the whole vehicle.

[0007] Optionally, the energy storage device comprises: a first battery pack, one end of the first battery pack is connected to one end of the eighth switch and the other end of the third switch, the other end of the first battery pack is connected to a connection node between one end of the seventh switch and the other end of the sixth switch; a second battery pack, one end of the second battery pack is connected to a connection node between the other end of the fifth switch and one end of the sixth switch, the other end of the second battery pack is connected to a connection node between the other end of the seventh switch and the other end of the fourth switch.

[0008] Optionally, the energy storage device comprises: a first fuse, one end of the first fuse is connected to one end of the first battery pack, the other end of the first fuse is connected to a connection node between one end of the eighth switch and the other end of the third switch; a second fuse, one end of the second fuse is connected to one end of the second battery pack, the other end of the second fuse is connected to a connection node between the other end of the fifth switch and one end of the sixth switch.

[0009] The second aspect embodiment of the application provides a vehicle, comprising: the charging and discharging system of the vehicle according to any one of claims 1-5.

[0010] The third aspect of the present application provides a charging and discharging method of a vehicle, which is applied to the charging and discharging system of the vehicle as claimed in any one of claims 1-5, and comprises the following steps: acquiring a current mode of the vehicle; and controlling the switch assembly to be in a corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at a first voltage or a second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device.

[0011] Optionally, the current mode is a high-voltage charging mode, and the step of controlling the switch assembly to be in a corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at a first voltage or a second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, comprises the following steps: controlling the sixth switch, the fifth switch, the second switch, the eleventh switch and the fourth switch to be closed, and charging an input capacitor of the vehicle electrical appliances through the second battery pack and the resistor; closing the first switch after pre-charging is completed, and controlling the inverter device to charge a capacitor connected in parallel to the inverter device, and closing the ninth switch and the third switch when the voltage of the capacitor is equal to the voltage of the first battery pack and the second battery pack connected in series, so as to charge the first battery pack and the second battery pack at a first voltage.

[0012] Optionally, the current mode is a low-voltage charging mode, and the step of controlling the switch assembly to be in a corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at a first voltage or a second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, comprises the following steps: controlling the seventh switch, the fifth switch, the eighth switch, the tenth switch, the fourth switch and the third switch to be closed in sequence, so as to charge the first battery pack and the second battery pack at a second voltage through the charging pile.

[0013] Optionally, the current mode is a driving mode, and the step of controlling the switch assembly to be in a corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at a first voltage or a second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, comprises the following steps: controlling the seventh switch, the fifth switch, the eighth switch, the first switch, the tenth switch and the fourth switch to be closed, so as to supply power to the vehicle electrical appliances and the driving motor through the first battery pack and the second battery pack connected in parallel.

[0014] In the above embodiments, the system controls the switch assembly to be in a corresponding switch state according to the current mode of the vehicle by using the control assembly, so as to charge the energy storage device at a first voltage or a second voltage through the charging interface, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device. Thus, the problem of increasing the cost of the whole vehicle due to the high-voltage system used in the existing automobile is solved, the high-voltage charging from 800V to 1000V is realized without changing the high-voltage electrical appliances of the whole vehicle, the charging power is improved, the cost is reduced, the voltage balance of the battery pack is realized through the motor control and the motor, and the consistency of the battery pack voltage is improved.

[0015] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

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

[0017] Figure 1 Circuit schematic diagram for series charging of battery pack in related art;

[0018] Figure 2 Circuit schematic diagram for series-parallel charging of battery pack in related art;

[0019] Figure 3 Structure schematic diagram of a charging and discharging system of a vehicle according to an embodiment of the present application;

[0020] Figure 4 Circuit schematic diagram during high-voltage charging according to an embodiment of the present application;

[0021] Figure 5 Circuit schematic diagram during high-voltage charging according to an embodiment of the present application, in which the motor controller and the motor work in the uniform mode;

[0022] Figures 6-7 Charging schematic diagram during high-voltage charging according to an embodiment of the present application, in which the motor controller and the motor work in the uniform mode;

[0023] Figure 8 Circuit schematic diagram in driving mode according to an embodiment of the present application;

[0024] Figure 9 Circuit schematic diagram for low-voltage charging according to an embodiment of the present application;

[0025] Figure 10 Example diagram of a charging method of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] 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.

[0027] The charging and discharging system of a vehicle, the vehicle and the charging method of the vehicle of the embodiments of the present application are described below with reference to the drawings. In view of the problem of the increase of the overall vehicle cost caused by the high-voltage system used by the existing automobile mentioned in the background art, the present application provides a charging and discharging system of a vehicle, in which the system uses a control component to control a switching component to be in a corresponding switching state according to the current mode of the vehicle, so as to charge a storage device through a charging interface at a first voltage or a second voltage, or supply power to the vehicle electrical appliances and the driving motor through the storage device. Thus, the problem of the increase of the overall vehicle cost caused by the high-voltage system used by the existing automobile is solved, and the high-voltage charging from 800V to 0V is realized without changing the high-voltage electrical appliances of the vehicle, the charging power is improved, the cost is reduced, the voltage balance of the battery pack is realized through the motor control and the motor, and the consistency of the battery pack voltage is improved.

[0028] Specifically, Figure 3 A schematic diagram of a charging and discharging system of a vehicle provided by the embodiments of the present application.

[0029] As Figure 3 shown, the charging and discharging system 10 of the vehicle includes a switching component, a storage device and a control component.

[0030] The switching component has multiple switching states, each of which corresponds to the current mode of the vehicle; the storage device is electrically connected to the charging interface, one end of the inverter device of the vehicle and the vehicle electrical appliances through the switching component, the other end of the inverter device is electrically connected to the driving motor of the vehicle; the control component controls the switching component to be in a corresponding switching state according to the current mode of the vehicle, so as to charge the storage device through the charging interface at a first voltage or a second voltage, or supply power to the vehicle electrical appliances and the driving motor through the storage device.

[0031] In the embodiments of the present application, the charging interface is a high-voltage charging pile and a low-voltage charging pile, and the inverter device of the vehicle includes a motor controller Q1, a motor controller Q2, a motor controller Q3, a motor controller Q4, a motor controller Q5, and a motor controller Q6. The motor controller Q1 and the motor controller Q2 are connected in series, the motor controller Q3 and the motor controller Q4 are connected in series, the motor controller Q5 and the motor controller Q6 are connected in series, the motor controller Q1 and the motor controller Q2 are connected in parallel with the motor controller Q3 and the motor controller Q4 and the motor controller Q5 and the motor controller Q6, the motor controller Q3 and the motor controller Q4 are connected in parallel with the motor controller Q5 and the motor controller Q6, the first voltage charging is high-voltage charging using the high-voltage charging pile, and the second voltage charging is low-voltage charging using the low-voltage charging pile.

[0032] Optionally, in some embodiments, the current mode is any one of a high-voltage charging mode, a low-voltage charging mode, and a driving mode.

[0033] The high-voltage charging mode can be understood as that the vehicle charges using a high-voltage charging column, the low-voltage charging mode can be understood as that the vehicle charges using a low-voltage charging pile, and the driving mode can be understood as that the vehicle is in a driving state.

[0034] Optionally, in some embodiments, the switch assembly comprises: a resistor R1, first to eleventh switches RL11, wherein one end of the first switch RL1 is connected to one end of the fifth switch RL5, and the other end of the first switch RL1 is connected to the positive output terminal HV+ of the whole vehicle; one end of the second switch RL2 is connected to one end of the resistor R1, and the other end of the second switch RL2 is connected to the positive output terminal HV+ of the whole vehicle; the other end of the resistor R1 is connected to the one end of the first switch RL1 and the one end of the fifth switch RL5, respectively; one end of the third switch RL3 is connected to the positive terminal DC+ of the charging interface, and the other end of the third switch RL3 is connected to the energy storage device; one end of the fourth switch RL4 is connected to the negative terminal DC- of the charging interface, and the other end of the fourth switch RL4 is connected to the energy storage device; the other end of the fifth switch RL5 is connected to one end of the sixth switch RL6 and the energy storage device, respectively; the other end of the sixth switch RL6 is connected to the energy storage device and one end of the seventh switch RL7, respectively; one end and the other end of the seventh switch RL7 are both connected to the energy storage device; one end of the eighth switch RL8 is connected to one end of the energy storage device, and the other end of the eighth switch RL8 is connected to the connection node between the first switch RL1 and the fifth switch RL5; one end of the ninth switch RL9 is connected to the energy storage device, and the other end of the ninth switch RL9 is connected to the inverter device; one end of the tenth switch RL10 is connected to the connection node between the ninth switch RL9 and the inverter device, and the other end of the tenth switch RL10 is connected to the positive output terminal HV+ of the whole vehicle; one end of the eleventh switch RL11 is connected to the driving motor, and the other end of the eleventh switch RL11 is connected to the positive output terminal HV+ of the whole vehicle.

[0035] In some embodiments, the energy storage device comprises: a first battery group Bat1, one end of the first battery group Bat1 is connected to one end of the eighth switch RL8 and the other end of the third switch RL3, and the other end of the first battery group Bat1 is connected to the connection node between one end of the seventh switch RL7 and the other end of the sixth switch RL6; a second battery group Bat2, one end of the second battery group Bat2 is connected to the connection node between the other end of the fifth switch RL5 and one end of the sixth switch RL6, and the other end of the second battery group Bat2 is connected to the connection node between the other end of the seventh switch RL7 and the other end of the fourth switch RL4.

[0036] Optionally, in some embodiments, the energy storage device comprises: a first fuse Fuse1, one end of the first fuse Fuse1 being connected to one end of the first battery pack Bat1, the other end of the first fuse Fuse1 being connected to a connection node between the other end of the third switch RL3 and one end of the eighth switch RL8; and a second fuse Fuse2, one end of the second fuse Fuse2 being connected to one end of the second battery pack Bat2, the other end of the second fuse Fuse2 being connected to a connection node between the other end of the fifth switch RL5 and one end of the sixth switch RL6.

[0037] Specifically, the application is divided into high-voltage charging mode, low-voltage charging mode and driving mode according to the specific state of the charging pile.

[0038] When the current mode of the vehicle is the high-voltage charging mode, as shown in Figure 4 , the sixth switch RL6, the fifth switch RL5, the second switch RL2, the eleventh switch RL11 and the fourth switch RL4 are attracted, and the second battery pack Bat2 charges the input capacitor of the high-voltage electrical appliance of the vehicle through the resistor R1. After the pre-charging is completed, the eleventh switch RL1 is closed, at this time, the motor controller and the driving motor work in the boost state to charge the capacitor C1, the motor controller Q2, the motor controller Q4 and the motor controller Q6 work in the switch state, Q2, Q4 and Q6 are turned on to charge the driving motor inductor, Q2, Q4 and Q6 are turned off, the driving motor inductor charges the capacitor C1 through the body diode of the motor controller Q1, Q3 and Q5, when the voltage of the capacitor C1 is equal to the voltage of the series connection of the first battery pack Bat1 and the second battery pack Bat2, the ninth switch RL9 is closed, and finally the third switch RL3 is closed to start the high-voltage charging.

[0039] The second battery pack Bat2 supplies power to the high-voltage electrical appliance of the vehicle during high-voltage charging. Since the second battery pack Bat2 supplies power to the vehicle, the voltages of the first battery pack Bat1 and the second battery pack Bat2 are equal during the charging process, so the motor controller and the driving motor work in the uniform mode, which can be simplified as Figure 4 Figure 5 , 6 ​, 7, when fast charging, motor controller Q1, motor controller Q3, motor controller Q5 work as open state, the first battery group Bat1 is driving motor inductance energy storage, Q1, Q3, Q5 off, drive motor energy storage through motor controller Q2, Q4, Q6 for the second battery group Bat2 charge, thus plays the purpose of balancing the first battery group Bat1 and the second battery group Bat2 voltage, thus avoids the problem of two battery groups charging imbalance. When the charging is completed, the third switch RL3 is turned off, and the energy stored in the capacitor C1 is discharged to the first battery group Bat1 and the second battery group Bat2 through the inverter (i.e. motor controller Q1, Q2, Q4, Q6, Q3, Q5).

[0040] When the current mode of the vehicle is the driving mode, by Figure 3 get Figure 8 , the seventh switch RL7, the fifth switch RL5, the eighth switch RL8, the eleventh switch RL1, the tenth switch RL10, the fourth switch RL4 are closed, and the remaining switches are turned off, the first battery group Bat1 and the second battery group Bat2 are connected in parallel to supply power to the high-voltage electrical appliances and motor controllers of the electric vehicle, ensuring the vehicle driving.

[0041] When the current mode of the vehicle is the low-voltage charging mode, by Figure 3 get Figure 9 , the seventh switch RL7, the fifth switch RL5, the eighth switch RL8, the first switch RL1, the tenth switch RL10, the fourth switch RL4, the third switch RL3 are closed, and the remaining switches are turned off, the external charging pile charges the first battery group Bat1 and the second battery group Bat2, and simultaneously provides high-voltage power supply for the whole vehicle.

[0042] The charging and discharging system of the vehicle according to the embodiments of the present application uses the control assembly to control the switch assembly to be in the corresponding switch state according to the current mode of the vehicle, to charge the energy storage device at the first voltage or the second voltage through the charging interface, or to supply power to the electrical appliances of the whole vehicle and the driving motor through the energy storage device. Thus, the problem of increasing the cost of the whole vehicle due to the high-voltage system used by the existing vehicle is solved, the high-voltage charging from 800V to 1000V is realized without changing the high-voltage electrical appliances of the whole vehicle, the charging power is improved, the cost is reduced, the voltage balance of the battery groups is realized through motor control and motor, and the consistency of the battery group voltage is improved.

[0043] The embodiments of the present application also provide a vehicle comprising the charging and discharging system of the vehicle.

[0044] The embodiments of the present application also propose a charging method of a vehicle.

[0045] As Figure 10As shown, the charging method of the vehicle adopts the charging and discharging system of the vehicle described above, and the method comprises the following steps:

[0046] In step S1001, the current mode of the vehicle is acquired.

[0047] In step S1002, the switch assembly is controlled to be in the corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device.

[0048] Optionally, in some embodiments, the current mode is the high-voltage charging mode, the switch assembly is controlled to be in the corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, which comprises: controlling the sixth switch, the fifth switch, the second switch, the eleventh switch and the fourth switch to be closed, and charging the input capacitor of the vehicle electrical appliances through the resistance of the second battery pack; closing the first switch after the pre-charging is completed, and controlling the inverter device to charge the capacitor connected in parallel with the inverter device, and closing the ninth switch and the third switch when the voltage of the capacitor is equal to the voltage of the first battery pack and the second battery pack connected in series, so as to charge the first battery pack and the second battery pack at the first voltage.

[0049] Optionally, in some embodiments, the current mode is the low-voltage charging mode, the switch assembly is controlled to be in the corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, which comprises: controlling the seventh switch, the fifth switch, the eighth switch, the tenth switch, the fourth switch and the third switch to be closed in sequence, and charging the first battery pack and the second battery pack at the second voltage through the charging pile.

[0050] Optionally, in some embodiments, the current mode is the driving mode, the switch assembly is controlled to be in the corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, which comprises: controlling the seventh switch, the fifth switch, the eighth switch, the first switch, the tenth switch and the fourth switch to be closed, and supplying power to the vehicle electrical appliances and the driving motor through the parallel connection of the first battery pack and the second battery pack.

[0051] It should be noted that the above description of the charging system of the vehicle is also applicable to the charging method of the vehicle of this embodiment, which will not be described here.

[0052] According to the charging method of the vehicle provided in the embodiments of the present application, the current mode of the vehicle is acquired, the switch assembly is controlled to be in a corresponding switch state according to the current mode, first voltage charging or second voltage charging is performed on the energy storage device through the charging interface, or the vehicle electrical appliances and the driving motor are powered through the energy storage device. In this way, high-voltage charging from 800V to 1000V is realized, the charging power is improved, the cost is reduced, the voltage balancing of the battery pack is realized through motor control and the motor, and the consistency of the battery pack voltage is improved.

[0053] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection 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 does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or N embodiments or examples. 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.

[0054] 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.

[0055] Any process or method descriptions in flow charts or described elsewhere herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions (or steps) in the process, and that the alternative implementations can be realized where the steps are performed in an order different than those described, including substantially concurrently or in reverse order, where necessary, depending on the functionality involved, and that the application contains additional steps that can be carried out or omitted, where necessary, should the specific context allow. These descriptions and representations are used by those skilled in the art to characterize and better understand the process. However, there are also descriptions and representations of the application in the form of accountants, algorithms, actions, procedures, protocols, trees, etc. that have not been explicitly described or shown herein in detail, but are implied therein as being implementable under some appropriate circumstances, to the extent that different structures, functions, or operations of the application are described, claimed, protected, or suggested.

Claims

1. A charge-discharge system of a vehicle, characterized by comprising: The application relates to a charging system for a vehicle, comprising: a switch assembly having a plurality of switch states, each switch state corresponding to a current mode of the vehicle; an energy storage device electrically connected to a charging interface, one end of an inverter device of the vehicle and vehicle electrical appliances through the switch assembly, the other end of the inverter device being electrically connected to a drive motor of the vehicle; a control assembly for controlling the switch assembly to be in a corresponding switch state according to the current mode of the vehicle, so as to charge the energy storage device through the charging interface at a first voltage or a second voltage, or supply power to the vehicle electrical appliances and the drive motor through the energy storage device.

2. The charge and discharge system of a vehicle according to claim 1, characterized by, The current mode is any one of a high-voltage charging mode, a low-voltage charging mode and a driving mode.

3. The vehicle charge and discharge system according to claim 1, characterized by, The switch assembly comprises a resistor and first to eleventh switches, wherein: one end of the first switch is connected to one end of the fifth switch, and the other end of the first switch is connected to a positive output terminal of the vehicle; one end of the second switch is connected to one end of the resistor, and the other end of the second switch is connected to the positive output terminal of the vehicle; the other end of the resistor is connected to one end of the first switch and one end of the fifth switch respectively; one end of the third switch is connected to a positive terminal of the charging interface, and the other end of the third switch is connected to the energy storage device; one end of the fourth switch is connected to a negative terminal of the charging interface, and the other end of the fourth switch is connected to the energy storage device; the other end of the fifth switch is connected to one end of the sixth switch and the energy storage device respectively; the other end of the sixth switch is connected to the energy storage device and one end of the seventh switch respectively; one end and the other end of the seventh switch are both connected to the energy storage device; one end of the eighth switch is connected to one end of the energy storage device, and the other end of the eighth switch is connected to a connection node between the first switch and the fifth switch; one end of the ninth switch is connected to the energy storage device, and the other end of the ninth switch is connected to the inverter device; one end of the tenth switch is connected to a connection node between the ninth switch and the inverter device, and the other end of the tenth switch is connected to the positive output terminal of the vehicle; one end of the eleventh switch is connected to the drive motor, and the other end of the eleventh switch is connected to the positive output terminal of the vehicle.

4. The charge and discharge system of a vehicle according to claim 3, characterized by The energy storage device comprises: a first battery pack, one end of the first battery pack being connected to one end of the eighth switch and the other end of the third switch, and the other end of the first battery pack being connected to a connection node between one end of the seventh switch and the other end of the sixth switch; a second battery pack, one end of the second battery pack being connected to a connection node between the other end of the fifth switch and one end of the sixth switch, and the other end of the second battery pack being connected to a connection node between the other end of the seventh switch and the other end of the fourth switch.

5. The charge and discharge system of a vehicle according to claim 4, characterized by The energy storage device comprises: a first fuse, one end of the first fuse being connected to one end of the first battery pack, and the other end of the first fuse being connected to a connection node between one end of the eighth switch and the other end of the third switch. A second safety device, one end of the second safety device is connected with one end of the second battery pack, and the other end of the second safety device is connected with a connection node between the other end of the fifth switch and one end of the sixth switch.

6. A vehicle characterized by comprising: Comprise: The charging and discharging system of the vehicle according to any one of claims 1-5.

7. A charge-discharge method of a vehicle, characterized by, The method is applied to the charging and discharging system of the vehicle according to any one of claims 1-5, and the method comprises the following steps: Obtaining the current mode of the vehicle; According to the current mode, control the switch assembly in the corresponding switch state, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device.

8. The method of claim 7, wherein, The current mode is a high-voltage charging mode, and the switch assembly is controlled in the corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, comprising: Control the sixth switch, the fifth switch, the second switch, the eleventh switch and the fourth switch to be closed, and the second battery pack charges the input capacitor of the vehicle electrical appliances through the resistance; After the pre-charging is completed, the first switch is closed, the inverter device is controlled to charge the capacitor connected in parallel with the inverter device, and when the voltage of the capacitor is equal to the voltage of the first battery pack and the second battery pack connected in series, the ninth switch and the third switch are closed to charge the first battery pack and the second battery pack at the first voltage.

9. The method of claim 7, wherein, The current mode is a low-voltage charging mode, and the switch assembly is controlled in the corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, comprising: In turn, control the seventh switch, the fifth switch, the eighth switch, the tenth switch, the fourth switch and the third switch to be closed, and charge the first battery pack and the second battery pack through the charging pile at the second voltage.

10. The method of claim 7, wherein, The current mode is a driving mode, and the switch assembly is controlled in the corresponding switch state according to the current mode, so as to charge the energy storage device through the charging interface at the first voltage or the second voltage, or supply power to the vehicle electrical appliances and the driving motor through the energy storage device, comprising: Close the seventh switch, the fifth switch, the eighth switch, the first switch, the tenth switch and the fourth switch, and supply power to the vehicle electrical appliances and the driving motor through the parallel connection of the first battery pack and the second battery pack.