Vehicle and charging system and method thereof

Abstract

The invention provides a vehicle and a charging system and method thereof. The charging system of the vehicle comprises a vehicle control device used for receiving a charging signal; the vehicle control device is connected with a low-voltage storage battery of the vehicle and used for obtaining power supply voltage of the low-voltage storage battery after receiving the charging signal and controlling the vehicle to enter a normal charging mode or an emergency charging mode according to the power supply voltage so as to charge the vehicle. Starting electricity demands of the vehicle can be met through the low-voltage storage battery or the power battery of the vehicle, the situation that the electric vehicle cannot be started is avoided, a user does not need to carry electricity for fire, potential safety hazards are reduced, operation is safe and convenient, charging equipment does not need to be carried along with the vehicle, and extra cost expenditure of the user is avoided.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle and a charging system and method thereof. Background Art

[0002] When the vehicle is started, the low-voltage battery is mainly used to provide the low-voltage power supply required by the electrical modules of the vehicle, so as to achieve the normal start and operation of the vehicle. However, when the vehicle is parked for a long time, the starting battery is over-discharged, damaged, or the starting battery reaches the end of its life, the starting battery cannot work normally, resulting in the low-voltage system being unable to be powered on and working normally, and the vehicle cannot be charged normally, which seriously affects the user's car experience.

[0003] In the related art, in the case where the starting battery cannot work properly, the starting battery (low-voltage battery) is generally charged by an external battery or a charging device that is carried at any time, thereby restoring the vehicle charging function. However, the charging method is inconvenient to operate and has certain risks. If it is not operated properly, it may cause safety accidents and pose safety hazards. In addition, the portable charging device needs to be purchased by the user, which increases the consumption cost. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, an object of the present invention is to propose a vehicle charging system, which can meet the vehicle's starting power requirements through the vehicle's low-voltage battery or power battery, thereby avoiding the situation where the electric vehicle cannot be started, and does not require users to operate jump-start the engine, thereby reducing safety hazards. The operation is safe and convenient, and there is no need to carry charging equipment on the vehicle, thereby avoiding additional costs for users.

[0006] To this end, a second object of the present invention is to provide a charging system for a vehicle.

[0007] To this end, a third object of the present invention is to provide a vehicle charging method.

[0008] To this end, a fourth object of the present invention is to provide a vehicle.

[0009] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a vehicle charging system, which includes: a vehicle control device; the vehicle control device is used to receive a charging signal; the vehicle control device is connected to a low-voltage battery of the vehicle, and is used to obtain the supply voltage of the low-voltage battery after receiving the charging signal, and control the vehicle to enter a normal charging mode or an emergency charging mode according to the supply voltage to charge the vehicle.

[0010] According to the vehicle charging system of the embodiment of the present invention, the vehicle control device receives the charging signal, obtains the supply voltage of the vehicle's low-voltage battery, and determines whether the vehicle's low-voltage battery is working normally according to the supply voltage of the vehicle's low-voltage battery, thereby controlling the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the vehicle's starting power demand can be met by the vehicle's low-voltage battery or power battery, avoiding the situation where the electric vehicle cannot be started, and there is no need for the user to operate the ignition, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditures for users.

[0011] In some embodiments, the charging system of the vehicle also includes: a power battery; in the normal charging mode, the vehicle control device is used to control the low-voltage battery to supply power to the low-voltage electrical load of the vehicle, and control the external charging power supply to charge the power battery.

[0012] In some embodiments, in the emergency charging mode, the vehicle control device is used to control the power battery to supply power to the low-voltage battery and the low-voltage electrical load, and control the external charging power supply to charge the power battery.

[0013] In some embodiments, in the emergency charging mode, after controlling the external charging power supply to charge the power battery of the vehicle, the vehicle control device is also used to: control the power battery to stop supplying power to the low-voltage battery and the low-voltage electrical load.

[0014] In some embodiments, in the emergency charging mode, after controlling the external charging power supply to charge the power battery of the vehicle, the vehicle control device is further used to: control the external charging power supply to supply power to the low-voltage battery and the low-voltage electrical load.

[0015] In some embodiments, the vehicle control device is specifically used to: step down the voltage output by the power battery or the external charging power supply to supply power to the low-voltage battery and the low-voltage electrical load.

[0016] In some embodiments, the charging signal includes a DC charging signal; in the normal charging mode, the vehicle control device is used to: control the DC charging positive contactor and the DC charging negative contactor of the power battery to close, so that the high-voltage DC power provided by the external charging power supply can power the power battery; in the emergency charging mode, the vehicle control device is used to: step down the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage electrical load; the vehicle control device is also used to: control the DC charging positive contactor and the DC charging negative contactor of the power battery to close, so that the high-voltage DC power provided by the external charging power supply can power the power battery.

[0017] In some embodiments, the charging signal includes an AC charging signal, and the charging system of the vehicle also includes: an on-board charger, which is connected to the power battery and is also connected to the external charging power supply; the vehicle control device receives the AC charging signal through the on-board charger; in the normal charging mode, the vehicle control device is used to: transmit the high-voltage AC power provided by the external charging power supply to the power battery through the on-board charger to power the power battery; in the emergency charging mode, the vehicle control device is used to: step down the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage electrical load; the vehicle control device is also used to: transmit the high-voltage AC power provided by the external charging power supply to the power battery through the on-board charger to power the power battery.

[0018] In some embodiments, in the emergency charging mode, the vehicle control device is also used to: receive the high-voltage AC power provided by the external charging power source through the on-board charger, and after stepping down and converting the high-voltage AC power into DC power, supply power to the low-voltage battery and the low-voltage electrical load.

[0019] In some embodiments, after receiving the charging signal, the vehicle control device is also used to: determine whether the charging signal is a valid signal; when the charging signal is determined to be a valid signal, execute the action of obtaining the power supply voltage of the low-voltage battery, otherwise, do not execute the action of obtaining the power supply voltage of the low-voltage battery.

[0020] In some embodiments, the vehicle control device is specifically used to: when it is determined that the supply voltage is greater than a preset voltage, control the vehicle to enter the normal charging mode; otherwise, control the vehicle to enter the emergency charging mode.

[0021] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a vehicle charging system, which includes: a power battery, an on-board charger and a vehicle control device; wherein the positive electrode of the power battery is connected to the positive electrode of an external DC charging power supply through a DC charging positive electrode contactor, and the negative electrode of the power battery is connected to the negative electrode of an external DC charging power supply through a DC charging negative electrode contactor; the vehicle control device is respectively connected to the positive electrode and negative electrode of the power battery, and the vehicle control device is also connected to the low-voltage battery and low-voltage power load of the vehicle, and the vehicle control device is also connected to the on-board charger; the on-board charger is connected to the positive electrode and negative electrode of the power battery, and the on-board charger is also connected to the positive electrode and negative electrode of the external AC charging power supply.

[0022] According to the charging system of the vehicle of the embodiment of the present invention, the power battery is connected to the external DC charging power supply so that the high-voltage DC power provided by the external charging power supply can power the power battery, and the power battery is connected to the low-voltage battery and the low-voltage power load of the vehicle, so that in the emergency charging mode, the vehicle control device reduces the voltage of the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage power load, and the vehicle control device connects the power battery and the external AC charging power supply through the on-board charger, and transmits the high-voltage AC power provided by the external charging power supply to the power battery to power the power battery, so as to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the power connection, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0023] In order to achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention proposes a vehicle charging method, which includes the following steps: receiving a charging signal; obtaining the supply voltage of a low-voltage battery of the vehicle; and controlling the vehicle to enter a normal charging mode or an emergency charging mode according to the supply voltage to charge the vehicle.

[0024] The charging method of the vehicle according to the embodiment of the present invention can be suitable for the main control ECU of the vehicle to execute. After receiving the charging signal, the main control ECU obtains the supply voltage of the low-voltage battery of the vehicle, and judges whether the low-voltage battery of the vehicle is working normally according to the supply voltage of the low-voltage battery of the vehicle, so as to control the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or the power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the ignition, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0025] In some embodiments, the normal charging mode includes: controlling the low-voltage battery to supply power to the low-voltage electrical loads of the vehicle, and controlling an external charging power source to charge the power battery of the vehicle.

[0026] In some embodiments, the emergency charging mode includes: controlling the power battery to supply power to the low-voltage storage battery and the low-voltage electrical load, and controlling the external charging power supply to charge the power battery.

[0027] In some embodiments, in the emergency charging mode, after controlling the external charging power supply to charge the power battery of the vehicle, it also includes: controlling the power battery to stop supplying power to the low-voltage battery and the low-voltage electrical load.

[0028] In some embodiments, in the emergency charging mode, after controlling the external charging power supply to charge the power battery of the vehicle, it also includes: controlling the external charging power supply to supply power to the low-voltage battery and the low-voltage power load.

[0029] In some embodiments, controlling the power battery or the external charging power supply to supply power to the low-voltage battery and the low-voltage electrical load includes: stepping down the voltage output by the power battery or the external charging power supply to supply power to the low-voltage battery and the low-voltage electrical load.

[0030] In some embodiments, the charging signal includes a DC charging signal; the normal charging mode includes: controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to be closed, so that the high-voltage DC power provided by the external charging power supply can power the power battery; the emergency charging mode includes: after reducing the high-voltage DC power provided by the power battery, supply power to the low-voltage battery and the low-voltage power load; controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to be closed, so that the high-voltage DC power provided by the external charging power supply can power the power battery.

[0031] In some embodiments, the charging signal includes an AC charging signal, which is received by an on-board charger; the normal charging mode includes: transmitting the high-voltage AC power provided by the external charging power source to the power battery through the on-board charger to power the power battery; the emergency charging mode includes: stepping down the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage power load; transmitting the high-voltage AC power provided by the external charging power source to the power battery through the on-board charger to power the power battery.

[0032] In some embodiments, in the emergency charging mode, it also includes: receiving high-voltage alternating current provided by the external charging power source through the on-board charger, and after stepping down and converting the high-voltage alternating current into direct current, supplying power to the low-voltage battery and the low-voltage electrical load.

[0033] In some embodiments, after receiving the charging signal, it also includes: determining whether the charging signal is a valid signal; when the charging signal is determined to be a valid signal, executing the action of obtaining the power supply voltage of the low-voltage battery, otherwise, not executing the action of obtaining the power supply voltage of the low-voltage battery.

[0034] In some embodiments, the vehicle is controlled to enter a normal charging mode or an emergency charging mode according to the supply voltage, including: when it is determined that the supply voltage is greater than a preset voltage, the vehicle is controlled to enter the normal charging mode; otherwise, the vehicle is controlled to enter the emergency charging mode.

[0035] In order to achieve the above-mentioned objectives, an embodiment of the fourth aspect of the present invention proposes a vehicle, which includes: a charging system for a vehicle as described in the above-mentioned embodiment; or, the vehicle includes: a processor, a memory, and a charging program for the vehicle stored in the memory and executable on the processor, wherein the charging program for the vehicle, when executed by the processor, implements the charging method for the vehicle as described in the above-mentioned embodiment.

[0036] The vehicle according to the embodiment of the present invention can be suitable for the main control ECU of the vehicle to execute. After receiving the charging signal, the main control ECU obtains the supply voltage of the low-voltage battery of the vehicle, and determines whether the low-voltage battery of the vehicle is working normally according to the supply voltage of the low-voltage battery of the vehicle, so as to control the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or the power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the ignition, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 is a schematic diagram of the hardware structure of a vehicle high-voltage system according to an embodiment of the present invention;

[0040] Figure 2 is a structural block diagram of a charging system for a vehicle according to an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of the hardware structure of a vehicle charging system according to another embodiment of the present invention;

[0042] Figure 4 is a flow chart of a vehicle charging method according to an embodiment of the present invention;

[0043] Figure 5 is a connection diagram of a main control ECU according to an embodiment of the present invention;

[0044] Figure 6 is a flow chart of a vehicle charging method according to a specific embodiment of the present invention;

[0045] Figure 7 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0046] Reference numerals: Charging system 1 for a vehicle;

[0047] Vehicle control device 11;

[0048] Vehicle 3. DETAILED DESCRIPTION

[0049] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0050] In the relevant technology, vehicles including fuel vehicles, hybrid vehicles and pure electric vehicles are all equipped with starting batteries (i.e. low-voltage batteries). When the vehicle is started, the starting battery provides the low-voltage power supply required by each electrical module of the vehicle, generally 12V, to achieve vehicle starting and normal operation.

[0051] The inventors have found that when a vehicle is parked for a long time, causing the starting battery to be over-discharged, damaged, or the starting battery to reach the end of its life, the starting battery cannot work normally and the vehicle's charging function is lost, i.e., the power battery cannot be charged. For electric vehicles that need to be charged, this will seriously affect the user's car experience.

[0052] At present, when the starting battery of an electric vehicle fails, an external battery or a power bank carried on the vehicle is usually used to charge the low-voltage battery that feeds it. Then a charging pile is used to insert an AC charging gun or a DC charging gun. Only after the charging control module interacts with the charging pile can the charging process be entered normally to charge the power battery.

[0053] However, if the starting battery malfunctions, is damaged or otherwise fails, the vehicle will lose its charging function, which is very inconvenient and affects the user experience for electric vehicles that need to be charged at any time. There is a certain risk when users use external devices to charge the battery, and misoperation may cause damage to the vehicle or even personal injury accidents. In addition, the power bank carried in the vehicle needs to be purchased at extra cost, which increases the user's consumption expenditure. The power bank carried in the vehicle needs to be charged regularly, otherwise there may not be enough power when it is needed, and the vehicle cannot be started normally.

[0054] Based on this, the vehicle charging method of the embodiment of the present invention, when the low-voltage battery of the electric vehicle is normal, the low-voltage battery supplies power to the low-voltage system to meet the power demand when the vehicle is started, so that the vehicle can start normally. After the vehicle is started, the vehicle is connected to an external charging power source, such as plugging an AC charging gun or a DC charging gun to connect the vehicle. After the charging control module and the charging pile complete the interaction, the power battery can be charged. After the low-voltage battery of the electric vehicle is fed with power, the vehicle is connected to an external charging power source, such as plugging an AC charging gun or a DC charging gun to connect the vehicle, waking up the main control ECU, the main control ECU performs self-detection, and enters the emergency charging mode, and the high-voltage electricity of the power battery is stepped down to output a 12V low voltage to the low-voltage battery and its other low-voltage loads, so as to meet the starting power demand of the vehicle, without the need to connect the power to the fire, reducing safety hazards, and safe and convenient operation. Therefore, the embodiment of the present invention provides two charging modes to cope with the normal or abnormal state of the low-voltage battery, improves the reliability of vehicle charging, and can meet the vehicle's starting power requirements through the vehicle's low-voltage battery or power battery, avoiding the situation where the electric vehicle cannot start. There is no need for users to operate jump-starting, reducing safety hazards. The operation is safe and convenient, and there is no need to carry charging equipment on the vehicle, avoiding additional costs for users.

[0055] The following first describes the hardware structure of the vehicle high-voltage system according to an embodiment of the present invention by way of example, and implements the functional requirements of the emergency charging mode based on the high-voltage system structure.

[0056] like Figure 1 The figure shows a hardware structure diagram of a vehicle high voltage system according to an embodiment of the present invention. A main control ECU is arranged on the vehicle, and modules with related functions such as battery management, AC charging, DCDC (direct current charging), vehicle control and motor control are integrated in the main control ECU. The main control ECU is directly connected to the power battery, and there is no other high voltage contactor separating the two. Even if the vehicle does not need to work and is in a dormant state, the high voltage side of the main control ECU is always high voltage, so that the main control ECU can intervene at any time according to the wake-up command to complete the normal charging or emergency charging of the vehicle.

[0057] Combine the following Figure 2 A charging system 1 for a vehicle according to an embodiment of the present invention will be described.

[0058] like Figure 2 As shown, the vehicle charging system 1 includes: a vehicle control device 11; the vehicle control device 11 is used to receive a charging signal; the vehicle control device 11 is connected to the low-voltage battery of the vehicle, and is used to obtain the power supply voltage of the low-voltage battery after receiving the charging signal, and control the vehicle to enter a normal charging mode or an emergency charging mode according to the power supply voltage to charge the vehicle.

[0059] In an embodiment, after the vehicle's charging system 1 is connected to an external charging power supply, the external charging power supply inputs a charging signal to the vehicle's charging system 1, and the vehicle control device 11 of the vehicle's charging system 1 receives the charging signal, wakes up the vehicle's charging system 1, and performs self-detection. After the self-detection is completed, the vehicle's control device 11 obtains the supply voltage of the vehicle's low-voltage battery, and controls the vehicle to enter a normal charging mode or an emergency charging mode according to the supply voltage of the vehicle's low-voltage battery. If the supply voltage of the vehicle's low-voltage battery is large, for example, the supply voltage is greater than a preset voltage, that is, it is determined that the supply voltage of the low-voltage battery is normal, the vehicle is controlled to enter a normal charging mode, and the power of the low-voltage battery is used preferentially to provide the power demand of the low-voltage system of the entire vehicle, and after interacting with the external charging power supply for the charging process, the external charging power supply is controlled to charge the vehicle.

[0060] If the supply voltage of the vehicle's low-voltage battery is small, for example, the supply voltage is less than or equal to the preset voltage, that is, it is determined that the supply voltage of the low-voltage battery is abnormal, the low-voltage battery is faulty, and cannot meet the power demand of the low-voltage system, then the vehicle is controlled to enter the emergency charging mode, and the high voltage electricity of the power battery is converted into low voltage electricity (such as 13.8V±0.2V) to power the low-voltage system, and charge the low-voltage battery at the same time, thereby relying on the large-capacity power storage capacity of the power battery to achieve ultra-long standby of the low-voltage power system of the whole vehicle, and after interacting with the external charging power supply for the charging process, the external charging power supply is controlled to charge the vehicle, so that when the low-voltage battery of the vehicle is abnormal and cannot meet the power demand of the low-voltage system and the vehicle can be started normally, the power battery is used to provide the power demand required by the low-voltage system and charge the low-voltage battery, so that the vehicle can start normally, ensuring that the charging function of the vehicle is normal, that is, ensuring that the charging pile can charge the power battery.

[0061] In a specific embodiment, the vehicle control device 11 includes a step-down module. Specifically, the step-down module can be connected to an external charging power source through an on-board charger (OBC) and receive a charging signal. The step-down module is connected to the low-voltage battery and other low-voltage power loads of the vehicle. When the OBC receives the charging signal, it transmits the signal to the step-down module. After the step-down module wakes up, it obtains the power supply voltage of the low-voltage battery of the vehicle to determine whether the power supply voltage of the low-voltage battery is normal, and then it is convenient to determine whether the starting battery of the vehicle can work normally, that is, to determine whether the low-voltage battery can meet the voltage required for normal starting of the vehicle. Furthermore, the step-down module can control the vehicle to enter a normal charging mode or an emergency charging mode according to the power supply voltage to charge the vehicle.

[0062] According to the vehicle charging system 1 of the embodiment of the present invention, the vehicle control device 11 receives the charging signal, obtains the supply voltage of the vehicle's low-voltage battery, and determines whether the vehicle's low-voltage battery is working normally according to the supply voltage of the vehicle's low-voltage battery, thereby controlling the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the vehicle's starting power demand can be met by the vehicle's low-voltage battery or power battery, avoiding the situation where the electric vehicle cannot be started, and there is no need for the user to operate the jump start, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditures for users.

[0063] In some embodiments, the vehicle charging system 1 also includes: a power battery; in normal charging mode, the vehicle control device 11 is used to control the low-voltage battery to supply power to the vehicle's low-voltage electrical loads, and control the external charging power supply to charge the power battery.

[0064] In the embodiment, when the vehicle is in normal charging mode, the vehicle control device 11 controls the low-voltage battery to supply power to the vehicle's low-voltage electrical load (i.e., the low-voltage system) to meet the power supply requirements of low-voltage components and enable the vehicle to start normally; after the vehicle control device 11 provides a stable low-voltage power supply, the OBC of the vehicle control device 11 controls the external charging power supply to charge the power battery to ensure that the charging function of the vehicle operates normally.

[0065] In some embodiments, in the emergency charging mode, the vehicle control device 11 is used to control the power battery to supply power to the low-voltage storage battery and the low-voltage electrical load, and to control the external charging power supply to charge the power battery.

[0066] In an embodiment, when the vehicle is in emergency charging mode, the vehicle control device 11 controls the power battery to supply power to the low-voltage battery and the low-voltage electrical load (i.e., the low-voltage system) to meet the power supply requirements of the low-voltage components so that the vehicle can start normally; after providing a stable low-voltage power supply, the OBC of the vehicle control device 11 controls the external charging power supply to output a high voltage to charge the power battery to ensure that the charging function of the vehicle operates normally.

[0067] In some embodiments, in the emergency charging mode, after controlling the external charging power source to charge the power battery of the vehicle, the vehicle control device 11 is also used to: control the power battery to stop supplying power to the low-voltage battery and the low-voltage electrical loads.

[0068] In the embodiment, when the vehicle is in the emergency charging mode, after the OBC of the vehicle control device 11 controls the external charging power supply to charge the power battery of the vehicle, at this time, the power battery is in a charging state. To ensure the safety of the power battery, the step-down module of the vehicle control device 11 controls the power battery to stop supplying power to the low-voltage battery and the low-voltage power load, that is, controls the power battery to stop discharging, thereby ensuring the normal charging of the power battery, avoiding dangerous situations caused by charging and discharging the power battery at the same time, and improving the service life and safety of the power battery.

[0069] In some embodiments, in the emergency charging mode, after controlling the external charging power supply to charge the power battery of the vehicle, the vehicle control device 11 is also used to: control the external charging power supply to supply power to the low-voltage battery and the low-voltage electrical load.

[0070] In the embodiment, when the vehicle is in the emergency charging mode, the OBC of the vehicle control device 11 controls the external charging power supply to charge the power battery of the vehicle, and also controls the power battery to stop supplying power to the low-voltage battery and the low-voltage power load, and controls the external charging power supply to output a high voltage to supply power to the low-voltage battery and the low-voltage power load, that is, the power battery is controlled to stop discharging, and the charging pile charges the power battery to meet the vehicle charging function. At the same time, the high-voltage electricity output by the charging pile is converted into low-voltage electricity through the step-down module, and output to the low-voltage battery and the low-voltage power load to ensure the normal power supply of the low-voltage power load, and the low-voltage battery is charged at the same time to make the low-voltage system work normally. That is, in the emergency charging mode, after the vehicle is started, the charging pile charges the power battery to meet the charging function. On the other hand, the electric energy output by the charging pile supplies power to the low-voltage battery and the low-voltage power load, while ensuring the stable charging of the power battery, it can also meet the power demand of the low-voltage battery and the low-voltage power load.

[0071] In some embodiments, the vehicle control device 11 is specifically used to: step down the voltage output by the power battery or the external charging power supply to supply power to the low-voltage battery and the low-voltage electrical load.

[0072] In the embodiment, since the power battery and the external charging power supply (such as a charging pile) both output high voltage electricity, and the low-voltage battery and the low-voltage electrical load require low voltage electricity (such as 13.8V±0.2V), before the OBC of the vehicle control device 11 controls the high voltage output of the power battery to supply power to the low-voltage battery and the low-voltage electrical load, or controls the high voltage output of the external charging power supply to charge the power battery of the vehicle, the step-down module steps down the high voltage output by the power battery or the external charging power supply and converts it into a low voltage that meets the requirements of the low-voltage system. The output low voltage is generally 13.8V±0.2V. Therefore, the low voltage electricity converted by the step-down module supplies power to the low-voltage battery and the low-voltage electrical load to meet the power requirements of the low-voltage system.

[0073] In some embodiments, the charging signal includes a DC charging signal; in normal charging mode, the vehicle control device 11 is used to: control the closure of the DC charging positive contactor and the DC charging negative contactor of the power battery, so that the high-voltage DC power provided by the external charging power supply can power the power battery; in emergency charging mode, the vehicle control device 11 is used to: step down the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage power load; the vehicle control device 11 is also used to: control the closure of the DC charging positive contactor and the DC charging negative contactor of the power battery, so that the high-voltage DC power provided by the external charging power supply can power the power battery.

[0074] In an embodiment, when the vehicle is in a normal charging mode, the OBC of the vehicle control device 11 initiates a charging process interaction with an external charging power source, such as initiating a charging process interaction with a DC charging pile, controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to close, and after the charging process interaction is completed, the OBC controls the external charging power source (DC charging pile) to output a high voltage to supply power to the vehicle's power battery, ensuring that the vehicle's charging function is normal. Among them, when the OBC of the vehicle control device 11 interacts with the external charging power source (such as a charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two have successfully established a connection, the charging process interaction is completed.

[0075] When the vehicle is in the emergency charging mode, the step-down module of the vehicle control device 11 controls the power battery to output high-voltage direct current, and converts the high-voltage direct current provided by the power battery into low-voltage electricity (such as 13.8V±0.2V) after stepping down the high-voltage direct current provided by the power battery, so that the high-voltage direct current provided by the external charging power supply can meet the power supply requirements of low-voltage components, so that the vehicle can start normally; the OBC of the vehicle control device 11 initiates the charging process interaction with the external charging power supply, such as initiating the charging process interaction with the DC charging pile, controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to close, and after the charging process interaction is completed, the OBC controls the external charging power supply (DC charging pile) to output high voltage to charge the power battery of the vehicle, ensuring that the charging function of the vehicle is normal. Among them, when the OBC of the vehicle control device 11 interacts with the external charging power supply (such as a charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two are successfully connected, the charging process interaction is completed.

[0076] In some embodiments, the charging signal includes an AC charging signal, and the vehicle's charging system 1 also includes: an on-board charger, the on-board charger is connected to the power battery, and the on-board charger is also connected to an external charging power supply; the vehicle control device 11 receives the AC charging signal through the on-board charger; in normal charging mode, the vehicle control device 11 is used to: transmit the high-voltage AC power provided by the external charging power supply to the power battery through the on-board charger to power the power battery; in emergency charging mode, the vehicle control device 11 is used to: step down the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage power load; the vehicle control device 11 is also used to: transmit the high-voltage AC power provided by the external charging power supply to the power battery through the on-board charger to power the power battery.

[0077] In an embodiment, when the vehicle is in normal charging mode, the OBC of the vehicle control device 11 initiates a charging process interaction with an external charging power source, such as initiating a charging process interaction with an AC charging pile, and receiving an AC charging signal through the on-board charger. After the charging process interaction is completed, the OBC controls the external charging power source (AC charging pile) to output a high voltage to supply power to the vehicle's power battery, thereby ensuring that the vehicle's charging function is normal. Among them, when the OBC of the vehicle control device 11 interacts with the external charging power source (such as a charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two have successfully established a connection, the charging process interaction is completed.

[0078] When the vehicle is in the emergency charging mode, the step-down module of the vehicle control device 11 controls the power battery to output high-voltage direct current, and converts the high-voltage direct current provided by the power battery into low-voltage electricity (such as .8V±0.2V) after stepping down, so that the high-voltage direct current provided by the external charging power supply can meet the power supply requirements of low-voltage components for the power battery, so that the vehicle can start normally; the OBC of the vehicle control device 11 initiates the charging process interaction with the external charging power supply, such as initiating the charging process interaction with the AC charging pile, and receiving the AC charging signal through the on-board charger. After the charging process interaction is completed, the OBC controls the external charging power supply (AC charging pile) to output high voltage to power the vehicle's power battery, ensuring that the vehicle's charging function is normal. Among them, when the OBC of the vehicle control device 11 interacts with the external charging power supply (such as a charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two are successfully connected, the charging process interaction is completed.

[0079] In some embodiments, in the emergency charging mode, the vehicle control device 11 is also used to: receive high-voltage AC power provided by an external charging power source through an on-board charger, and after stepping down and converting the high-voltage AC power into DC power, supply power to a low-voltage battery and a low-voltage electrical load.

[0080] In the embodiment, in the emergency charging mode, the vehicle control device 11 receives high-voltage AC power provided by an external charging power source through the on-board charger, controls the step-down module to step down and convert the high-voltage AC power into low-voltage AC power, and outputs it to the low-voltage battery and low-voltage electrical load to ensure the normal power supply of the low-voltage electrical load.

[0081] In some embodiments, after receiving a charging signal, the vehicle control device 11 is also used to: determine whether the charging signal is a valid signal; when the charging signal is determined to be a valid signal, execute the action of obtaining the power supply voltage of the low-voltage battery, otherwise, do not execute the action of obtaining the power supply voltage of the low-voltage battery.

[0082] In the embodiment, the OBC of the vehicle control device 11 receives the charging signal and determines whether the charging signal is a valid signal. If the OBC determines that the charging signal is a valid signal, it transmits it to the buck module, and the buck module is awakened accordingly and performs self-testing. After the self-test is completed, the power supply voltage of the vehicle's low-voltage battery is obtained; if the OBC of the main control ECU determines that the charging signal is an invalid signal, it does not transmit it to the buck module, and the buck module does not wake up, and does not execute the acquisition of the power supply voltage of the vehicle's low-voltage battery. By determining whether the charging signal is a valid signal, the buck module of the vehicle control device 11 can be effectively prevented from being mistakenly awakened, and invalid buck output of the vehicle control device 11 can be avoided, and the operating load of the vehicle control device 11 can be reduced, while saving energy consumption.

[0083] In some embodiments, the vehicle control device 11 is specifically used to: when it is determined that the power supply voltage is greater than a preset voltage, control the vehicle to enter a normal charging mode; otherwise, control the vehicle to enter an emergency charging mode.

[0084] In the embodiment, after the step-down module of the vehicle control device 11 obtains the supply voltage of the low-voltage battery of the vehicle after waking up, it determines the magnitude relationship between the supply voltage of the low-voltage battery of the vehicle and the preset voltage, which is, for example, but not limited to, 11 V. When the step-down module determines that the supply voltage of the low-voltage battery of the vehicle is greater than the preset voltage 11 V, it is considered that the low-voltage battery is not feeding power and the low-voltage power supply of the whole vehicle is normal, then the step-down module controls the vehicle to enter the normal charging mode, preferentially uses the power of the low-voltage battery to provide the low-voltage power of the whole vehicle, and after interacting with the external charging power supply for the charging process, controls the external charging power supply to charge the vehicle power battery.

[0085] When the step-down module determines that the supply voltage of the vehicle's low-voltage battery is less than the preset voltage of 11V, it believes that the power supply of the low-voltage battery cannot meet the low-voltage supply for vehicle charging. The step-down module then controls the vehicle to enter emergency charging mode, and uses the power battery to power the low-voltage system. Relying on the large-capacity power storage capacity of the power battery, it achieves an ultra-long standby time for the low-voltage system of the entire vehicle, and after interacting with the external charging power supply to carry out the charging process, it controls the external charging power supply to charge the vehicle's power battery.

[0086] According to the vehicle charging system 1 of the embodiment of the present invention, the vehicle control device 11 receives the charging signal, obtains the supply voltage of the vehicle's low-voltage battery, and determines whether the vehicle's low-voltage battery is working normally according to the supply voltage of the vehicle's low-voltage battery, thereby controlling the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the vehicle's starting power demand can be met by the vehicle's low-voltage battery or power battery, avoiding the situation where the electric vehicle cannot be started, and there is no need for the user to operate the jump start, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditures for users.

[0087] Combine the following Figure 3 A charging system for a vehicle according to an embodiment of the present invention is described.

[0088] like Figure 3 As shown, the charging system of the embodiment of the present invention includes: a vehicle control device, a power battery and an on-board charger; wherein the positive electrode of the power battery is connected to the positive electrode of an external DC charging power supply through a DC charging positive electrode contactor, and the negative electrode of the power battery is connected to the negative electrode of the external DC charging power supply through a DC charging negative electrode contactor; the vehicle control device is respectively connected to the positive electrode and negative electrode of the power battery, the vehicle control device is also connected to the low-voltage battery and low-voltage power load of the vehicle, and the vehicle control device is also connected to the on-board charger; the on-board charger is connected to the positive electrode and negative electrode of the power battery, and the on-board charger is also connected to the positive electrode and negative electrode of the external AC charging power supply.

[0089] In an embodiment, the positive electrode of the power battery is connected to the positive electrode of the external DC charging power supply through a DC charging positive electrode contactor, and the negative electrode of the power battery is connected to the negative electrode of the external DC charging power supply through a DC charging negative electrode contactor. The vehicle control device controls the DC charging positive electrode contactor and the DC charging negative electrode contactor of the power battery to close, and the positive electrode of the power battery is connected to the positive electrode of the external DC charging power supply, and the negative electrode of the power battery is connected to the negative electrode of the external DC charging power supply, so that the high-voltage DC power provided by the external charging power supply powers the power battery.

[0090] The vehicle control device is connected to the positive and negative poles of the power battery respectively. The vehicle control device is also connected to the vehicle's low-voltage battery and low-voltage electrical load. In the emergency charging mode, the vehicle control device steps down the high-voltage direct current provided by the power battery and supplies power to the low-voltage battery and low-voltage electrical load.

[0091] The vehicle control device is connected to the on-board charger, and the on-board charger is connected to the positive and negative electrodes of the power battery. The on-board charger is also connected to the positive and negative electrodes of the external AC charging power supply. The vehicle control device receives the AC charging signal through the on-board charger, connects the power battery and the external AC charging power supply, and can transmit the high-voltage AC power provided by the external charging power supply to the power battery to power the power battery.

[0092] According to the charging system of the vehicle of the embodiment of the present invention, the power battery is connected to the external DC charging power supply so that the high-voltage DC power provided by the external charging power supply can power the power battery, and the power battery is connected to the low-voltage battery and the low-voltage power load of the vehicle, so that in the emergency charging mode, the vehicle control device reduces the voltage of the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage power load, and the vehicle control device connects the power battery and the external AC charging power supply through the on-board charger, and transmits the high-voltage AC power provided by the external charging power supply to the power battery to power the power battery, so as to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the power connection, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0093] Combine the following Figure 4-Figure 6 The vehicle charging method according to the embodiment of the present invention is described by way of example.

[0094] like Figure 4 As shown, the vehicle charging method of the embodiment of the present invention at least includes steps S1 to S3, and the execution subject of the method can be the main control ECU of the vehicle.

[0095] Step S1, receiving a charging signal.

[0096] Among them, the charging signal is a signal output when the external charging power supply is connected to the charging port of the vehicle. The external charging power supply is usually a charging gun used to charge the vehicle's power battery, such as an AC charging gun or a DC charging gun, which is connected through the vehicle's AC charging port or DC charging port to facilitate the main control ECU to wake up after receiving the charging signal.

[0097] In the embodiment, the user uses an AC charging gun or a DC charging gun to connect to the AC charging port or the DC charging port of the vehicle. When the charging gun is connected to the charging port of the vehicle, the charging gun inputs a charging signal to the vehicle. After the main control ECU receives the charging signal, the main control ECU is awakened and performs a self-test. After the self-test is completed, the vehicle is controlled to enter the corresponding charging mode. Step S2, obtain the supply voltage of the low-voltage battery of the vehicle.

[0098] In the embodiment, after the main control ECU completes the self-test, it obtains the supply voltage of the vehicle's low-voltage battery. By obtaining the supply voltage of the vehicle's low-voltage battery, it is determined whether the supply voltage of the low-voltage battery is normal, and then it is convenient to determine whether the vehicle's starting battery can work normally, that is, to determine whether the low-voltage battery can meet the voltage required for normal starting of the vehicle.

[0099] Step S3, controlling the vehicle to enter a normal charging mode or an emergency charging mode according to the power supply voltage to charge the vehicle.

[0100] Among them, the normal charging mode is that the vehicle's low-voltage battery works normally, that is, it can meet the voltage required for normal starting of the vehicle. The vehicle gives priority to using the low-voltage battery to provide the voltage required for normal starting of the vehicle, and the low-voltage battery powers the low-voltage system (including multiple low-voltage power loads), that is, entering the normal charging mode; the emergency charging mode is that the vehicle's low-voltage battery fails, that is, it cannot meet the voltage required for normal starting of the vehicle. The vehicle uses the power battery to provide the voltage required for normal starting of the vehicle, and the power battery powers the low-voltage system (including multiple low-voltage power loads), for example, converting the high voltage electricity output by the power battery into low voltage electricity suitable for powering the low-voltage system, so as to power the low-voltage system and charge the low-voltage battery at the same time, that is, entering the emergency charging mode.

[0101] In an embodiment, after the main control ECU obtains the supply voltage of the vehicle's low-voltage battery, it controls the vehicle to enter a normal charging mode or an emergency charging mode according to the size of the supply voltage of the vehicle's low-voltage battery. If the supply voltage of the vehicle's low-voltage battery is large, for example, the supply voltage is greater than a preset voltage, that is, it is determined that the supply voltage of the low-voltage battery is normal, the vehicle is controlled to enter a normal charging mode, and the power of the low-voltage battery is used preferentially to provide the power demand of the low-voltage system of the entire vehicle. After interacting with the external charging power supply for the charging process, the external charging power supply is controlled to charge the vehicle.

[0102] If the supply voltage of the vehicle's low-voltage battery is small, for example, the supply voltage is less than or equal to the preset voltage, that is, it is determined that the supply voltage of the low-voltage battery is abnormal, the low-voltage battery is faulty, and cannot meet the power demand of the low-voltage system, then the vehicle is controlled to enter the emergency charging mode, and the high voltage electricity of the power battery is converted into low voltage electricity (such as 13.8V±0.2V) to power the low-voltage system, and charge the low-voltage battery at the same time, thereby relying on the large-capacity power storage capacity of the power battery to achieve ultra-long standby of the low-voltage power system of the whole vehicle, and after interacting with the external charging power supply for the charging process, the external charging power supply is controlled to charge the vehicle, so that when the low-voltage battery of the vehicle is abnormal and cannot meet the power demand of the low-voltage system and the vehicle can be started normally, the power battery is used to provide the power demand required by the low-voltage system and charge the low-voltage battery, so that the vehicle can start normally, ensuring that the charging function of the vehicle is normal, that is, ensuring that the charging pile can charge the power battery.

[0103] The charging method of the vehicle according to the embodiment of the present invention can be suitable for the main control ECU of the vehicle to execute. After receiving the charging signal, the main control ECU obtains the supply voltage of the low-voltage battery of the vehicle, and judges whether the low-voltage battery of the vehicle is working normally according to the supply voltage of the low-voltage battery of the vehicle, so as to control the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or the power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the ignition, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0104] In some embodiments, the normal charging mode includes: controlling the low-voltage battery to supply power to the low-voltage electrical loads of the vehicle; and controlling the external charging power supply to charge the power battery of the vehicle.

[0105] In the embodiment, when the vehicle is in normal charging mode, the main control ECU controls the low-voltage battery to supply power to the vehicle's low-voltage power load (i.e., the low-voltage system) to meet the power supply requirements of low-voltage components and enable the vehicle to start normally; after the main control ECU provides a stable low-voltage power supply, the OBC of the main control ECU controls the external charging power supply to output a high voltage to charge the vehicle's power battery, ensuring that the vehicle's charging function operates normally.

[0106] In some embodiments, the emergency charging mode includes: controlling the power battery to supply power to a low-voltage storage battery and a low-voltage electrical load; and controlling an external charging power source to charge the power battery of the vehicle.

[0107] In the embodiment, when the vehicle is in emergency charging mode, the main control ECU controls the power battery to supply power to the low-voltage battery and low-voltage power load (i.e., the low-voltage system) to meet the power supply requirements of the low-voltage components so that the vehicle can start normally; after the main control ECU provides a stable low-voltage power supply, the OBC of the main control ECU controls the external charging power supply to output a high voltage to charge the vehicle's power battery to ensure that the vehicle's charging function operates normally.

[0108] In some embodiments, in the emergency charging mode, after controlling the external charging power source to charge the power battery of the vehicle, it also includes: controlling the power battery to stop supplying power to the low-voltage battery and the low-voltage power load.

[0109] In the embodiment, when the vehicle is in the emergency charging mode, after the OBC of the main control ECU controls the external charging power supply to charge the power battery of the vehicle, at this time, the power battery is in a charging state. To ensure the safety of the power battery, the step-down module controls the power battery to stop supplying power to the low-voltage battery and the low-voltage power load, that is, controls the power battery to stop discharging, ensures the normal charging of the power battery, avoids dangerous situations caused by charging and discharging the power battery at the same time, and improves the service life and safety of the power battery.

[0110] In some embodiments, in the emergency charging mode, after controlling the external charging power supply to charge the power battery of the vehicle, it also includes: controlling the external charging power supply to supply power to a low-voltage battery and a low-voltage power load.

[0111] In the embodiment, when the vehicle is in the emergency charging mode, the OBC of the main control ECU controls the power battery to stop supplying power to the low-voltage battery and the low-voltage power load after controlling the external charging power supply to charge the power battery of the vehicle, and controls the external charging power supply to output high voltage to supply power to the low-voltage battery and the low-voltage power load, that is, the power battery is controlled to stop discharging, and the charging pile charges the power battery to meet the vehicle charging function. At the same time, the high voltage electricity output by the charging pile is converted into low voltage electricity through the step-down module, and output to the low-voltage battery and the low-voltage power load to ensure the normal power supply of the low-voltage power load, and the low-voltage battery is charged at the same time to make the low-voltage system work normally. That is, in the emergency charging mode, after the vehicle is started, the charging pile charges the power battery to meet the charging function. On the other hand, the electric energy output by the charging pile supplies power to the low-voltage battery and the low-voltage power load, which can ensure the stable charging of the power battery and meet the power demand of the low-voltage battery and the low-voltage power load.

[0112] In some embodiments, controlling the power battery or the external charging power supply to supply power to the low-voltage storage battery and the low-voltage electrical load includes: stepping down the voltage output by the power battery or the external charging power supply to supply power to the low-voltage storage battery and the low-voltage electrical load.

[0113] In the embodiment, since the power battery and the external charging power supply (such as a charging pile) both output high voltage electricity, and the low-voltage battery and the low-voltage electrical load require low voltage electricity (such as 13.8V±0.2V), therefore, before the OBC of the main control ECU controls the high voltage output of the power battery to supply power to the low-voltage battery and the low-voltage electrical load, or controls the high voltage output of the external charging power supply to charge the power battery of the vehicle, the high voltage output by the power battery or the external charging power supply is stepped down by the step-down module and converted into a low voltage that meets the requirements of the low-voltage system. The output low voltage is generally 13.8V±0.2V. Therefore, the low voltage electricity converted by the step-down module is used to supply power to the low-voltage battery and the low-voltage electrical load to meet the power requirements of the low-voltage system.

[0114] In some embodiments, the charging signal includes a DC charging signal; the normal charging mode includes: controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to be closed, so that the high-voltage DC power provided by the external charging power supply can power the power battery; the emergency charging mode includes: after stepping down the high-voltage DC power provided by the power battery, powering the low-voltage battery and the low-voltage power load; controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to be closed, so that the high-voltage DC power provided by the external charging power supply can power the power battery.

[0115] In an embodiment, when the vehicle is in normal charging mode, the OBC of the main control ECU initiates a charging process interaction with an external charging power source, such as initiating a charging process interaction with a DC charging pile, controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to close, and after the charging process interaction is completed, the OBC controls the external charging power source (DC charging pile) to output a high voltage to supply power to the vehicle's power battery, ensuring that the vehicle's charging function is normal. Among them, when the OBC of the main control ECU interacts with the external charging power source (such as a charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two are successfully connected, the charging process interaction is completed.

[0116] When the vehicle is in emergency charging mode, the buck module of the main control ECU controls the power battery to output high-voltage direct current, and converts the high-voltage direct current provided by the power battery into low-voltage electricity (such as 13.8V±0.2V) after bucking, so that the high-voltage direct current provided by the external charging power supply can meet the power supply requirements of low-voltage components for the power battery, so that the vehicle can start normally; the OBC of the main control ECU initiates the charging process interaction with the external charging power supply, such as initiating the charging process interaction with the DC charging pile, controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to close, and after the charging process interaction is completed, the OBC controls the external charging power supply (DC charging pile) to output high voltage to charge the vehicle's power battery, ensuring that the vehicle's charging function is normal. Among them, when the OBC of the main control ECU interacts with the external charging power supply (such as the charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two are successfully connected, the charging process interaction is completed.

[0117] In some embodiments, the charging signal includes an AC charging signal, which is received by an on-board charger; the normal charging mode includes: transmitting the high-voltage AC power provided by an external charging power source to the power battery through the on-board charger to power the power battery; the emergency charging mode includes: stepping down the high-voltage DC power provided by the power battery to power the low-voltage battery and the low-voltage power load; transmitting the high-voltage AC power provided by the external charging power source to the power battery through the on-board charger to power the power battery.

[0118] In an embodiment, when the vehicle is in normal charging mode, the OBC of the main control ECU initiates a charging process interaction with an external charging power source, such as initiating a charging process interaction with an AC charging pile, and receiving an AC charging signal through the on-board charger. After the charging process interaction is completed, the OBC controls the external charging power source (AC charging pile) to output a high voltage to power the vehicle's power battery, ensuring that the vehicle's charging function is normal. Among them, when the OBC of the main control ECU interacts with the external charging power source (such as a charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two are successfully connected, the charging process interaction is completed.

[0119] When the vehicle is in emergency charging mode, the buck module of the main control ECU controls the power battery to output high-voltage direct current, and converts the high-voltage direct current provided by the power battery into low-voltage electricity (such as 13.8V±0.2V) after bucking, so that the high-voltage direct current provided by the external charging power supply can meet the power supply requirements of low-voltage components for the power battery, so that the vehicle can start normally; the OBC of the main control ECU initiates the charging process interaction with the external charging power supply, such as initiating the charging process interaction with the AC charging pile, and receiving the AC charging signal through the on-board charger. After the charging process interaction is completed, the OBC controls the external charging power supply (AC charging pile) to output high voltage to power the vehicle's power battery, ensuring that the vehicle's charging function is normal. Among them, when the OBC of the main control ECU interacts with the external charging power supply (such as the charging pile) during the charging process, messages are sent to each other to determine whether the connection relationship is successfully established. When it is determined that the two are successfully connected, the charging process interaction is completed.

[0120] In some embodiments, in the emergency charging mode, it also includes: receiving high-voltage AC power provided by an external charging power source through an on-board charger, and after stepping down and converting the high-voltage AC power into DC power, supplying power to a low-voltage battery and a low-voltage power load.

[0121] In the embodiment, in the emergency charging mode, the high-voltage AC power provided by the external charging power source is received by the on-board charger OBC, and the step-down module is controlled to step down and convert the high-voltage AC power into low-voltage AC power, which is output to the low-voltage battery and the low-voltage power load to ensure the normal power supply of the low-voltage power load.

[0122] In some embodiments, after receiving the charging signal, it also includes: determining whether the charging signal is a valid signal; when the charging signal is determined to be a valid signal, executing the action of obtaining the power supply voltage of the low-voltage battery, otherwise, not executing the action of obtaining the power supply voltage of the low-voltage battery.

[0123] In the embodiment, after the OBC of the main control ECU receives the charging signal, it determines whether the charging signal is a valid signal. If the OBC determines that the charging signal is a valid signal, it transmits it to the buck module, and the buck module is awakened accordingly, and performs self-testing. After the self-test is completed, the power supply voltage of the low-voltage battery of the vehicle is obtained; if the OBC of the main control ECU determines that the charging signal is an invalid signal, it does not transmit it to the buck module, and the buck module does not wake up, and does not execute the acquisition of the power supply voltage of the low-voltage battery of the vehicle. By judging whether the charging signal is a valid signal, the buck module of the main control ECU can be effectively prevented from being woken up by mistake, and the invalid buck output of the main control ECU can be avoided, and the operating load of the main control ECU can be reduced, while saving energy consumption.

[0124] In some embodiments, when determining whether the charging signal is a valid signal, it is determined whether the charging connection parameters included in the charging signal meet the set parameter value range; if so, the charging signal is determined to be a valid signal, otherwise, the charging signal is determined to be an invalid signal.

[0125] In an embodiment, when the OBC of the main control ECU determines whether the charging signal is a valid signal, it determines whether the charging connection parameters included in the charging signal meet the set parameter value range. If the charging connection parameters included in the charging signal meet the set parameter value range, the charging signal is determined to be a valid signal, and the step-down module of the main control ECU is awakened and performs self-detection to obtain the supply voltage of the low-voltage battery of the vehicle; if the charging connection parameters included in the charging signal do not meet the set parameter value range, the charging signal is determined to be an invalid signal, and the step-down module of the main control ECU does not execute the acquisition of the supply voltage of the low-voltage battery of the vehicle.

[0126] For example, if there is debris at the AC charging port or the DC charging port of the charging pile, including rain, dirt or dust, the charging connection parameters included in the charging signal will not meet the set parameter value range. The OBC of the main control ECU detects that the charging connection parameters are abnormal, determines that the charging signal is an invalid signal, and the buck module of the main control ECU does not perform the wake-up action, thereby avoiding the buck module of the main control ECU from being invalidly awakened.

[0127] In a specific embodiment, the charging connection parameter is the resistance of the AC charging port or the DC charging port. When there are debris, including rain, dirt or dust, at the AC charging port or the DC charging port of the charging pile, the resistance value of the charging port included in the charging signal will not meet the set resistance range, and the OBC of the main control ECU detects that the resistance value is abnormal, determines that the charging signal is an invalid signal, and the buck module of the main control ECU does not perform the wake-up action, thereby avoiding the buck module of the main control ECU from being invalidly awakened.

[0128] In some embodiments, the charging signal includes any one of a CC signal for AC charging, a CP signal for AC charging, and a CC2 signal for DC charging.

[0129] In an embodiment, Figure 5 The figure shows a connection diagram of the main control ECU of an embodiment of the present invention. The three circuit pins of the OBC of the main control ECU are connected to the CC signal of AC charging, the CP signal of AC charging and the CC2 signal of DC charging through a low-voltage wiring harness, wherein the CC signal is an AC charging connection confirmation signal, the CP signal is a control guidance function signal, which is equivalent to a charging handshake signal, and the CC2 signal is a DC charging connection confirmation signal. When the OBC of the main control ECU detects any of the above signals, it is considered that the charging signal is received.

[0130] For example, when the vehicle is connected to an AC charging gun, the OBC of the main control ECU detects the CC signal and thinks that a charging signal has been received, so the buck module of the main control ECU is awakened; when the vehicle is connected to a DC charging gun, the OBC of the main control ECU detects the CC2 signal and thinks that a charging signal has been received, so the buck module of the main control ECU is awakened; after the vehicle is connected to an AC charging gun, if the power grid is out for a period of time and then the power is supplied, the starter battery is powered due to a fault, and the OBC of the main control ECU can also be awakened through the CP signal as the wake-up source. The CP signal is a PWM signal. After the OBC of the main control ECU recognizes this signal, it can execute the wake-up action, that is, the buck module can be awakened.

[0131] In some embodiments, the charging connection parameter includes a resistance of a charging interface of the external charging power source.

[0132] In an embodiment, when the OBC of the main control ECU determines whether the charging signal is a valid signal, it specifically includes: determining whether the charging connection parameters included in the charging signal meet the set parameter value range, wherein the charging connection parameters include the resistance of the charging interface of the external charging power supply. In other words, when the resistance of the charging interface of the external charging power supply is the resistance value of a standard AC gun, the buck module of the main control ECU is awakened.

[0133] Different types of charging guns have different corresponding CC resistances of the charging interface. In a specific embodiment, as shown in Table 1, the CC resistance values ​​corresponding to several charging guns with different charging powers are listed. It can be understood that different types of charging guns have different corresponding CP resistances or CC2 resistances of the charging interface. The standard CP resistances and standard CC2 resistances corresponding to charging interfaces of different power models can be obtained through experimental testing or querying relevant standards, and are pre-calibrated and stored in the main control ECU. To reduce redundancy, they are not listed one by one here.

[0134] Table 1

[0135] Charging power of charging pile CC resistance 1.6kW 1500Ω 3.3kW 680Ω 6.6kW 220Ω

[0136] In some embodiments, controlling the vehicle to enter a normal charging mode or an emergency charging mode according to the power supply voltage includes: when it is determined that the power supply voltage is greater than a preset voltage, controlling the vehicle to enter a normal charging mode; otherwise, controlling the vehicle to enter an emergency charging mode.

[0137] In the embodiment, after the buck module of the main control ECU obtains the supply voltage of the low-voltage battery of the vehicle after waking up, it determines the magnitude relationship between the supply voltage of the low-voltage battery of the vehicle and the preset voltage, which is, for example, but not limited to, 11V. When the buck module determines that the supply voltage of the low-voltage battery of the vehicle is greater than the preset voltage 11V, it is considered that the low-voltage battery is not feeding power and the low-voltage power supply of the whole vehicle is normal, then the buck module controls the vehicle to enter the normal charging mode, preferentially uses the power of the low-voltage battery to provide the low-voltage power of the whole vehicle, and after the OBC interacts with the external charging power supply in the charging process, the OBC controls the external charging power supply to charge the vehicle power battery.

[0138] When the step-down module determines that the supply voltage of the vehicle's low-voltage battery is less than the preset voltage of 11V, it believes that the power supply of the low-voltage battery cannot meet the low-voltage supply for vehicle charging. The step-down module controls the vehicle to enter the emergency charging mode, and uses the power battery to power the low-voltage system. Relying on the large-capacity power storage capacity of the power battery, the ultra-long standby time of the vehicle's low-voltage system is achieved. After the OBC interacts with the external charging power supply to perform the charging process, the OBC controls the external charging power supply to charge the vehicle's power battery.

[0139] Reference below Figure 6 The vehicle charging method according to the embodiment of the present invention is described by way of example.

[0140] like Figure 6 As shown, the vehicle charging method of the embodiment of the present invention at least includes steps S11 to S20.

[0141] Step S11, OBC receives a charging signal.

[0142] In step S12, the OBC determines whether the charging connection parameters (such as the resistance value of the charging interface) included in the charging signal meet the set parameter value range. If so, execute step S13; if not, execute step S14.

[0143] Step S13, the OBC determines that the charging signal is a valid signal, then the voltage reduction module wakes up, and the voltage reduction module obtains the supply voltage of the low-voltage battery of the vehicle.

[0144] Step S14, the OBC determines that the charging signal is an invalid signal, then the voltage reduction module does not wake up, the voltage reduction module does not obtain the power supply voltage of the low-voltage battery of the vehicle, and the process ends.

[0145] In step S15, the voltage reduction module determines whether the supply voltage is greater than a preset voltage. If so, step S16 is executed; if not, step S18 is executed.

[0146] Step S16: the voltage reduction module controls the vehicle to enter a normal charging mode.

[0147] Step S17, in normal charging mode, the step-down module controls the low-voltage battery to supply power to the low-voltage electrical load of the vehicle; the OBC interacts with the external charging power supply during the charging process, and after the interaction is completed, the OBC controls the external charging power supply to charge the power battery of the vehicle.

[0148] Step S18: the voltage reduction module controls the vehicle to enter the emergency charging mode.

[0149] In step S19, the OBC converts the high voltage electricity output by the power battery into low voltage electricity through the step-down module to supply power to the low voltage battery and the low voltage power load; after the low voltage power supply of the step-down module is stable, the OBC of the main control ECU interacts with the external charging power supply for the charging process. After the interaction is completed, the OBC controls the external charging power supply to charge the power battery of the vehicle.

[0150] In step S20, OBC controls the power battery to stop supplying power to the low-voltage battery and the low-voltage electrical load. At the same time, OBC converts the high-voltage electricity output by the external charging power supply into low-voltage electricity through the step-down module to supply power to the low-voltage battery and the low-voltage electrical load.

[0151] The charging method of the vehicle according to the embodiment of the present invention can be suitable for the main control ECU of the vehicle to execute. After receiving the charging signal, the main control ECU obtains the supply voltage of the low-voltage battery of the vehicle, and judges whether the low-voltage battery of the vehicle is working normally according to the supply voltage of the low-voltage battery of the vehicle, so as to control the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or the power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the ignition, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0152] Reference below Figure 7 A vehicle 3 according to an embodiment of the present invention will be described.

[0153] In some embodiments, Figure 7 As shown, the vehicle 3 according to the embodiment of the present invention includes the charging system 2 of the vehicle according to the above embodiment.

[0154] In other embodiments, the vehicle includes, for example, a processor, a memory, and a vehicle charging program stored in the memory and executable on the processor. When the vehicle charging program is executed by the processor, the vehicle charging method of the above-mentioned embodiment is implemented.

[0155] The vehicle 3 according to the embodiment of the present invention can be executed by the main control ECU of the vehicle. After receiving the charging signal, the main control ECU obtains the supply voltage of the low-voltage battery of the vehicle, and judges whether the low-voltage battery of the vehicle is working normally according to the supply voltage of the low-voltage battery of the vehicle, so as to control the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or the power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the ignition, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0156] The following describes a computer-readable storage medium according to an embodiment of the present invention.

[0157] The computer-readable storage medium of the embodiment of the present invention stores a vehicle charging program, and when the vehicle charging control program is executed by a processor, the vehicle charging method of the above embodiment is implemented.

[0158] According to the computer-readable storage medium of the embodiment of the present invention, when the charging program of the vehicle stored thereon is executed by the processor, the main control ECU can receive the charging signal. After receiving the charging signal, the main control ECU obtains the power supply voltage of the low-voltage battery of the vehicle, and judges whether the low-voltage battery of the vehicle is working normally according to the power supply voltage of the low-voltage battery of the vehicle, thereby controlling the vehicle to enter the normal charging mode or the emergency charging mode accordingly, so that in the normal charging mode, the low-voltage battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle, and in the emergency charging mode, the power battery supplies power to the low-voltage system to ensure the normal start and charging of the vehicle. In this way, the starting power demand of the vehicle can be met by the low-voltage battery or the power battery of the vehicle, avoiding the situation that the electric vehicle cannot be started, and there is no need for the user to operate the ignition, reducing safety hazards, safe and convenient operation, and no need to carry charging equipment with the vehicle, avoiding additional cost expenditure for users.

[0159] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0160] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", 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 invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0161] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vehicle charging system, characterized in that: include: Vehicle controls; The vehicle control device is used to receive a charging signal; The vehicle control device is connected to the low-voltage battery of the vehicle, and is used to obtain the supply voltage of the low-voltage battery after receiving the charging signal, and control the vehicle to enter a normal charging mode or an emergency charging mode according to the supply voltage to charge the vehicle.

2. The vehicle charging system according to claim 1, characterized in that: Also includes: Power battery; In the normal charging mode, the vehicle control device is used to control the low-voltage battery to supply power to the low-voltage electrical loads of the vehicle, and to control the external charging power supply to charge the power battery.

3. The vehicle charging system according to claim 2, characterized in that: In the emergency charging mode, the vehicle control device is used to control the power battery to supply power to the low-voltage storage battery and the low-voltage electrical load, and to control the external charging power supply to charge the power battery.

4. The vehicle charging system according to claim 3, characterized in that: In the emergency charging mode, after controlling the external charging power source to charge the power battery of the vehicle, the vehicle control device is further used to: The power battery is controlled to stop supplying power to the low-voltage storage battery and the low-voltage electrical load.

5. The vehicle charging system according to claim 3, characterized in that: In the emergency charging mode, after controlling the external charging power source to charge the power battery of the vehicle, the vehicle control device is further used to: The external charging power source is controlled to supply power to the low-voltage battery and the low-voltage electrical load.

6. The vehicle charging system according to claim 5, characterized in that: The vehicle control device is specifically used to reduce the voltage output by the power battery or the external charging power supply to supply power to the low-voltage battery and the low-voltage electrical load.

7. The vehicle charging system according to claim 6, characterized in that: The charging signal includes a DC charging signal; In the normal charging mode, the vehicle control device is used to: control the DC charging positive contactor and the DC charging negative contactor of the power battery to close, so that the high-voltage DC power provided by the external charging power supply supplies power to the power battery; In the emergency charging mode, the vehicle control device is used to: step down the high-voltage direct current provided by the power battery to supply power to the low-voltage battery and the low-voltage electrical load; the vehicle control device is also used to: control the closure of the DC charging positive contactor and the DC charging negative contactor of the power battery so that the high-voltage direct current provided by the external charging power supply supplies power to the power battery.

8. The vehicle charging system according to claim 6, characterized in that: The charging signal includes an AC charging signal, and the charging system of the vehicle further includes: An on-board charger, the on-board charger is connected to the power battery, and the on-board charger is also connected to the external charging power source; The vehicle control device receives the AC charging signal through the on-board charger; In the normal charging mode, the vehicle control device is used to: transmit the high-voltage alternating current provided by the external charging power source to the power battery through the on-board charger to supply power to the power battery; In the emergency charging mode, the vehicle control device is used to: reduce the voltage of the high-voltage direct current provided by the power battery to supply power to the low-voltage battery and low-voltage electrical loads; the vehicle control device is also used to: transmit the high-voltage alternating current provided by the external charging power source to the power battery through the on-board charger to supply power to the power battery.

9. The vehicle charging system according to claim 8, characterized in that: In the emergency charging mode, the vehicle control device is also used to: receive the high-voltage AC power provided by the external charging power source through the on-board charger, and after stepping down and converting the high-voltage AC power into DC power, supply power to the low-voltage battery and low-voltage electrical loads.

10. The vehicle charging system according to claim 1, characterized in that: Upon receiving the charging signal, the vehicle control device is further configured to: Determining whether the charging signal is a valid signal; When it is determined that the charging signal is a valid signal, the action of obtaining the power supply voltage of the low-voltage battery is performed; otherwise, the action of obtaining the power supply voltage of the low-voltage battery is not performed.

11. The vehicle charging system according to claim 1, characterized in that: The vehicle control device is specifically used for: When it is determined that the power supply voltage is greater than a preset voltage, the vehicle is controlled to enter the normal charging mode; otherwise, the vehicle is controlled to enter the emergency charging mode.

12. A vehicle charging system, characterized in that: include: Power battery, on-board charger and vehicle control device; The positive electrode of the power battery is connected to the positive electrode of the external DC charging power supply through a DC charging positive electrode contactor, and the negative electrode of the power battery is connected to the negative electrode of the external DC charging power supply through a DC charging negative electrode contactor; The vehicle control device is connected to the positive electrode and the negative electrode of the power battery respectively, and is also connected to the low-voltage battery and the low-voltage power load of the vehicle, and is also connected to the on-board charger; The on-board charger is connected to the positive electrode and the negative electrode of the power battery, and is also connected to the positive electrode and the negative electrode of an external AC charging power source.

13. A method for charging a vehicle, characterized in that: The following steps are involved: Receive charging signal; Obtain the supply voltage of the vehicle's low-voltage battery; The vehicle is controlled to enter a normal charging mode or an emergency charging mode according to the supply voltage to charge the vehicle.

14. The vehicle charging method according to claim 13, characterized in that: The normal charging mode includes: The low-voltage battery is controlled to supply power to the low-voltage electrical load of the vehicle, and an external charging power source is controlled to charge the power battery of the vehicle.

15. The vehicle charging method according to claim 14, characterized in that: The emergency charging mode includes: The power battery is controlled to supply power to the low-voltage storage battery and the low-voltage electrical load, and the external charging power supply is controlled to charge the power battery.

16. The vehicle charging method according to claim 15, characterized in that: In the emergency charging mode, after controlling the external charging power source to charge the power battery of the vehicle, the method further includes: The power battery is controlled to stop supplying power to the low-voltage storage battery and the low-voltage electrical load.

17. The vehicle charging method according to claim 15, characterized in that: In the emergency charging mode, after controlling the external charging power source to charge the power battery of the vehicle, the method further includes: The external charging power source is controlled to supply power to the low-voltage battery and the low-voltage electrical load.

18. The vehicle charging method according to claim 17, characterized in that: Controlling the power battery or the external charging power supply to supply power to the low-voltage storage battery and the low-voltage electrical load includes: The voltage output by the power battery or the external charging power source is stepped down to supply power to the low-voltage storage battery and the low-voltage electrical load.

19. The vehicle charging method according to claim 18, characterized in that: The charging signal includes a DC charging signal; The normal charging mode includes: controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to close, so that the high-voltage DC power provided by the external charging power supply supplies power to the power battery; The emergency charging mode includes: after reducing the voltage of the high-voltage direct current provided by the power battery, supplying power to the low-voltage storage battery and the low-voltage electrical load; controlling the DC charging positive contactor and the DC charging negative contactor of the power battery to close, so that the high-voltage direct current provided by the external charging power supply supplies power to the power battery.

20. The vehicle charging method according to claim 18, characterized in that: The charging signal includes an AC charging signal, and the AC charging signal is received by the on-board charger; The normal charging mode includes: transmitting the high-voltage alternating current provided by the external charging power source to the power battery through the on-board charger to supply power to the power battery; The emergency charging mode includes: reducing the voltage of the high-voltage direct current provided by the power battery to supply power to the low-voltage battery and the low-voltage electrical load; transmitting the high-voltage alternating current provided by the external charging power source to the power battery through the on-board charger to supply power to the power battery.

21. The vehicle charging method according to claim 20, characterized in that: In the emergency charging mode, it also includes: receiving the high-voltage alternating current provided by the external charging power source through the on-board charger, and after reducing the voltage and converting the high-voltage alternating current into direct current, supplying power to the low-voltage battery and the low-voltage electrical load.

22. The vehicle charging method according to claim 13, characterized in that: After receiving the charging signal, the method further includes: Determining whether the charging signal is a valid signal; When it is determined that the charging signal is a valid signal, the action of obtaining the power supply voltage of the low-voltage battery is performed; otherwise, the action of obtaining the power supply voltage of the low-voltage battery is not performed.

23. The vehicle charging method according to claim 13, characterized in that: Controlling the vehicle to enter a normal charging mode or an emergency charging mode according to the power supply voltage includes: When it is determined that the power supply voltage is greater than a preset voltage, the vehicle is controlled to enter the normal charging mode; otherwise, the vehicle is controlled to enter the emergency charging mode.

24. A vehicle, characterized in that: include: A charging system for a vehicle as claimed in any one of claims 1 to 12; or, A processor, a memory, and a vehicle charging program stored in the memory and executable on the processor, wherein the vehicle charging program, when executed by the processor, implements the vehicle charging method as described in claims 13-23.

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