Vehicle power supply system and method and vehicle

Abstract

The embodiment of the invention discloses a vehicle power supply system and method and a vehicle, the vehicle power supply system comprises a battery management system, and the battery management system is internally provided with a BMS controller; a power battery; a low-voltage storage battery; a DCDC controller; a high-voltage electric drive controller; when the BMS controller detects that a vehicle in an OFF gear has a low-voltage electricity demand, a circuit for providing high-voltage electricity for the high-voltage electric drive controller by the power battery is cut off, and the DCDC controller is controlled to convert the high-voltage electricity output by the power battery into low-voltage electricity; the input end of the low-voltage storage battery is connected with the output end of the DCDC controller, and low-voltage electricity output by the DCDC controller is used for supplying power to low-voltage electricity utilization components. According to the mode, the DCDC controller is integrated in the battery management system, and a circuit for providing high-voltage electricity for the high-voltage electric drive controller can be cut off by cutting off the power battery, so that a whole vehicle high-voltage system and a power domain network can be prevented from being awakened, a large number of controllers are prevented from being in an active state, and the low-voltage electricity burden can be remarkably reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more particularly, to a vehicle power supply system, method, and vehicle. Background Art

[0002] With the continuous development of vehicle technology and the growing market demand, new energy vehicles are becoming increasingly intelligent and electrified. In addition, compared with traditional vehicles, new energy vehicles are equipped with large-capacity power batteries that can meet the needs of long-term low-voltage power supply for the entire vehicle and discharge functions inside and outside the vehicle. Therefore, users' demands for the functions of new energy vehicles when they are stationary are gradually increasing.

[0003] In a related method, when the vehicle requires low-voltage power supply (such as battery recharging or sentry mode operation) and the battery is insufficient, it is necessary to wake up the vehicle's high-voltage system and activate the power domain network, using the power battery to power low-voltage electrical components, which in turn causes a large number of controllers on the vehicle to be active, significantly increasing the low-voltage power burden. Summary of the Invention

[0004] In view of the above problems, the present application proposes a vehicle power supply system, method and vehicle to improve the above problems.

[0005] In a first aspect, the present application provides a low-voltage battery charging system, the system comprising: Battery management system, which is equipped with: BMS controller; power battery; low-voltage battery; DCDC controller; High-voltage electric drive controller; When the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it cuts off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller, and controls the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power; The input end of the low-voltage battery is connected to the output end of the DCDC controller, and the low-voltage electricity output by the DCDC controller is used to power low-voltage electrical components.

[0006] Optionally, the system further comprises: A high-voltage relay is provided between the power battery and the high-voltage electric drive controller; When the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it cuts off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller, including: when the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it controls the high-voltage relay to disconnect.

[0007] Optionally, the high-voltage electric drive controller includes a front drive controller and a rear drive controller; the high-voltage relay includes a first relay and a second relay, wherein the first relay is electrically connected to the negative pole of the power battery, and the second relay is electrically connected to the positive pole of the power battery.

[0008] Optionally, the system further comprises: thermal management controllers and gateways; The gateway is communicatively connected with the thermal management controller, the battery management system and the high-voltage electric drive controller respectively through a first bus; The thermal management controller is communicatively connected to the battery management system via a second bus.

[0009] Optionally, the system further comprises: The domain controller is electrically connected to the output end of the low-voltage battery, and the domain controller is powered by the low-voltage electricity output by the low-voltage battery.

[0010] Optionally, the system further comprises: The domain controller is electrically connected to the output end of the DCDC controller, and the DCDC controller outputs low voltage electricity to the domain controller.

[0011] Optionally, when the BMS controller detects that the power level of the low-voltage battery of the vehicle in the OFF gear is less than a power threshold, it cuts off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller, and controls the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power; the input end of the low-voltage battery is connected to the output end of the DCDC controller, and the low-voltage power output by the DCDC controller is used to recharge the low-voltage battery.

[0012] In a second aspect, the present application provides a vehicle power supply method, which is applied to a BMS controller in any of the vehicle power supply systems described above, the method comprising: When it is detected that the vehicle in the OFF gear has a low-voltage power demand, the circuit for the power battery to provide high-voltage power to the high-voltage electric drive controller is cut off, and the DCDC controller is controlled to convert the high-voltage power output by the power battery into low-voltage power, so that the low-voltage power output by the DCDC controller can be used to power low-voltage electrical components.

[0013] Optionally, the method further includes: When it is detected that the power level of the low-voltage battery of a vehicle in the OFF gear is less than the power threshold, the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller is cut off, and the DCDC controller is controlled to convert the high-voltage power output by the power battery into low-voltage power, so that the low-voltage power output by the DCDC controller can be used to replenish the power of the low-voltage battery.

[0014] Optionally, the method further includes: When the temperature of the BMS controller is higher than a temperature threshold, a battery temperature signal is sent to a thermal management controller, so that the thermal management controller performs heat dissipation processing on the BMS controller according to the battery temperature signal.

[0015] In a third aspect, the present application provides a vehicle comprising one or more processors and a memory; one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs are configured to execute the above-mentioned method.

[0016] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores program code, wherein the above method is executed when the program code is run.

[0017] An embodiment of the present application provides a vehicle power supply system, including a battery management system, which is equipped with: a BMS controller; a power battery; a low-voltage battery; a DCDC controller; and a high-voltage electric drive controller; when the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it cuts off the circuit of the power battery providing high-voltage power to the high-voltage electric drive controller, and controls the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power; the input end of the low-voltage battery is connected to the output end of the DCDC controller, and the low-voltage power output by the DCDC controller is used to power low-voltage power components.

[0018] In the embodiment of the present application, the above-mentioned method enables the BMS controller to cut off the circuit that the power battery uses to provide high-voltage electricity to the high-voltage electric drive controller when it detects that the vehicle in the OFF gear has a low-voltage power demand, and control the DCDC controller to convert the high-voltage electricity output by the power battery into low-voltage electricity, so as to use the low-voltage electricity output by the DCDC controller to power the low-voltage electrical components. Since the DCDC controller is integrated into the battery management system and can cut off the circuit that the power battery uses to provide high-voltage electricity to the high-voltage electric drive controller, it is possible to avoid waking up the vehicle's high-voltage system and power domain network, thereby avoiding a large number of controllers being in an active state, and thus significantly reducing the low-voltage power burden. In addition, it can also extend the vehicle's standby time in a stationary state, improve the vehicle's energy efficiency and ease of use, while also reducing the potential failure risks that may be caused by waking up too many components, thereby enhancing the reliability and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram showing a communication connection of a vehicle power supply system proposed in an embodiment of the present application is shown; Figure 2 A circuit connection diagram of a vehicle power supply system proposed in an embodiment of the present application is shown; Figure 3 The present invention shows a communication method of a vehicle power supply system according to a related technology. Figure 4 A circuit connection diagram of a related technology in a vehicle power supply system proposed in an embodiment of the present application is shown; Figure 5 Shown is a structural block diagram of a vehicle proposed in this application. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] In the drawings, the sizes of components, layer thicknesses, or regions may be exaggerated for clarity. Therefore, any implementation of the present disclosure is not necessarily limited to the dimensions shown in the drawings, and the shapes and sizes of components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate idealized examples, and any implementation of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0023] Currently, new energy vehicles are becoming increasingly intelligent and electrified. Compared to traditional vehicles, new energy vehicles are equipped with larger-capacity power batteries, which can meet the needs of long-term low-voltage power supply for the entire vehicle and discharge functions inside and outside the vehicle. For example, in related technologies, when a new energy vehicle is in sentry mode, it can be parked for a long time to monitor the vehicle's periphery to ensure vehicle safety. In this scenario, functions such as on-board cameras and on-board radars need to operate for a long time, and the operation of these components relies on the vehicle's low-voltage battery. However, due to the long-term low-voltage power supply requirements, the power of the low-voltage battery alone cannot meet the needs. Therefore, the vehicle can regularly monitor the power level of the low-voltage battery. If the low-voltage battery is low, the vehicle can wake up the high-voltage system and activate the power domain network to replenish the battery through the DCDC controller.

[0024] However, in the related method, since the DCDC controller needs to work when the vehicle is parked for a long time, high voltage is required on the entire vehicle. This means that the vehicle's power components, such as the front and rear electric drives, power supply system, vehicle controller, engine and other components need to be maintained in an awake state. Therefore, the related method also has the problem of significantly increasing the low-voltage power burden of the entire vehicle.

[0025] Therefore, in an embodiment of the present application, a vehicle power supply system is provided, including a battery management system, in which are provided: a BMS controller; a power battery; a low-voltage battery; a DCDC controller; and a high-voltage electric drive controller; when the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it cuts off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller, and controls the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power; the input end of the low-voltage battery is connected to the output end of the DCDC controller, and the low-voltage power output by the DCDC controller is used to power low-voltage electrical components.

[0026] Through the above method, when the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it can cut off the circuit that the power battery uses to supply high-voltage electricity to the high-voltage electric drive controller, and control the DCDC controller to convert the high-voltage electricity output by the power battery into low-voltage electricity, so that the low-voltage electricity output by the DCDC controller can be used to power low-voltage electrical components. Because the DCDC controller is integrated into the battery management system and can cut off the circuit that the power battery uses to supply high-voltage electricity to the high-voltage electric drive controller, it can avoid waking up the entire vehicle's high-voltage system and power domain network, thereby avoiding a large number of controllers being in an active state, and thus significantly reducing the burden of low-voltage power consumption. In addition, it can also extend the vehicle's standby time in a static state, improve the vehicle's energy efficiency and ease of use, while also reducing the potential failure risks that may be caused by waking up too many components, and enhancing the reliability and stability of the system.

[0027] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are first described. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0028] BMS controller (Battery Management System Controller): This is a core component responsible for monitoring and managing the charging and discharging process of the power battery, battery status monitoring (such as voltage, current, and temperature), battery balancing management, and communication with other vehicle systems. In this application, the BMS controller also integrates a DC-DC control function, which can convert the high voltage power of the power battery into low voltage power when the vehicle is in the OFF gear and has low-voltage power demand, to meet the power supply needs of the vehicle's low-voltage system.

[0029] DCDC controller (Direct Current to Direct Current Controller): A power electronic device controller that can convert a DC voltage to a DC voltage. In this application, the DCDC controller's functionality is integrated within the BMS controller, converting the high-voltage (220V) output of the power battery into a low-voltage (12V-48V) output for use by the vehicle's low-voltage electrical components.

[0030] Thermal Management Controller (ITMS Controller): This can be an integrated thermal management system controller that is responsible for the overall control and coordination of the vehicle's thermal management system. It can control the direction and flow of the coolant, as well as the operating status of components such as the compressor, based on the temperature requirements of different vehicle components, to achieve temperature regulation and management of the vehicle's power system, battery system, and interior environment. In this application, the thermal management controller is connected to the BMS controller via a private CAN communication bus to provide heat dissipation support when the BMS controller is operating.

[0031] Front Motor Inverter Power Unit Controller (FMIPU controller): can be used to control the inverter operation of the front motor to realize functions such as driving and energy recovery of the front motor. During the vehicle's driving process, the speed, torque and other parameters of the motor can be accurately controlled according to driving requirements and vehicle status to ensure the vehicle's power output and energy efficiency management. In this application, the front drive controller is part of the vehicle's high-voltage system, and its working status may be monitored and coordinated by the BMS controller to optimize the energy consumption of the entire vehicle.

[0032] Rear Motor Inverter Power Unit Controller (RMIPU): This controller controls the inverter for the rear motor. It plays a crucial role in the vehicle's four-wheel drive or rear-wheel drive modes, precisely controlling the operation of the rear motor to achieve vehicle power distribution and drive control. In this application, the rear-wheel drive controller is also part of the high-voltage system, and its operating status may also be monitored and coordinated by the BMS controller.

[0033] CAN (Controller Area Network Bus) is a serial communication network widely used in automotive electronic control systems, featuring high reliability, strong real-time performance, and good anti-interference capabilities. In this application, the CAN bus is used to enable information exchange and communication between vehicle controllers, such as private CAN communication between the BMS controller and the ITMS controller, and communication connections between the gateway and each controller, ensuring collaborative operation and data sharing between various systems.

[0034] The embodiments of this application will be described below with reference to the accompanying drawings.

[0035] The present application embodiment provides a vehicle power supply system, referring to Figure 1 and Figure 2 , Figure 1A schematic diagram of a vehicle power supply system communication connection provided in an embodiment of the present application is provided. Figure 2 A schematic diagram of the circuit connection of a vehicle power supply system provided in an embodiment of the present application.

[0036] like Figure 1 and Figure 2 As shown, the system includes: A battery management system is provided with: a BMS controller; a power battery; a low-voltage battery; and a DCDC controller.

[0037] In this application, the BMS controller can be a power battery controller, which can be used to control the charging and discharging of the power battery. The power battery can be used to power the entire vehicle. The DCDC controller can be a DC-DC converter controller. In this application, the DCDC controller can be used to convert the high-voltage power output of the power battery into low-voltage power.

[0038] In this application, the input of the low-voltage battery is connected to the output of the DCDC controller, and the low-voltage power output by the DCDC controller is used to power low-voltage electrical components. The low-voltage battery can be used to power the vehicle's domain controller when the vehicle is in the OFF gear.

[0039] The system further comprises: High voltage electric drive controller.

[0040] In this application, the high-voltage electric drive controller can be electrically connected to the power battery. The high-voltage electric drive controller can be used to receive the high-voltage electricity output by the power battery and convert the output high-voltage electricity into three-phase alternating current to provide mechanical power output for the vehicle's high-voltage electric drive.

[0041] When the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it cuts off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller, and controls the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power.

[0042] In this application, when the BMS controller in the battery management system detects that the vehicle in the OFF gear has a low-voltage power demand, it can cut off the circuit that the power battery uses to provide high-voltage power to the high-voltage electric drive controller, and control the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power, so as to use the low-voltage power output by the DCDC controller to power low-voltage power components, thereby avoiding waking up the vehicle's high-voltage system and power domain network, avoiding a large number of controllers in an active state, and significantly reducing the low-voltage power burden.

[0043] In an optional embodiment, the BMS controller can cut off the circuit through which the power battery provides high voltage electricity to the high voltage electric drive controller when it detects that the power level of the low voltage battery of a vehicle in the OFF gear is less than a power threshold, and control the DCDC controller to convert the high voltage electricity output by the power battery into low voltage electricity; the input end of the low voltage battery can be connected to the output end of the DCDC controller, and the low voltage electricity output by the DCDC controller is used to recharge the low voltage battery.

[0044] Further, if Figure 2 As shown, the system further includes: A high-voltage relay is provided between the power battery and the high-voltage electric drive controller.

[0045] In an optional embodiment, when the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, cutting off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller may specifically include: When the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it controls the high-voltage relay to be disconnected.

[0046] In this application, when the BMS controller in the battery management system detects that the vehicle in the OFF gear has a low-voltage power demand, it can control the high-voltage relay to disconnect to cut off the circuit that the power battery provides high-voltage power to the high-voltage electric drive controller, thereby avoiding waking up the high-voltage electric drive controller and preventing a large number of controllers from being active.

[0047] In an optional embodiment, the high-voltage electric drive controller may include a front-drive controller and a rear-drive controller. The front-drive controller may be electrically connected to the power battery, receiving the high-voltage power output from the power battery and converting it into three-phase alternating current to provide mechanical power output for the vehicle's front electric drive. The rear-drive controller may be electrically connected to the power battery, receiving the high-voltage power output from the power battery and converting it into three-phase alternating current to provide mechanical power output for the vehicle's rear electric drive.

[0048] In an optional embodiment, the high-voltage relay may include a first relay and a second relay. The first relay is electrically connected to the negative electrode of the power battery; the second relay is electrically connected to the positive electrode of the power battery; and the first relay and the second relay are used to disconnect the front drive controller, the rear drive controller, and the power battery.

[0049] Further, if Figure 1 and Figure 2 As shown, the system further includes: thermal management controllers and gateways; The gateway is communicatively connected with the thermal management controller, the battery management system and the high-voltage electric drive controller respectively through a first bus; The thermal management controller is communicatively connected to the battery management system via a second bus.

[0050] The thermal management controller may include components such as a compressor controller, which is used to perform heat dissipation and / or cooling processing on the BMS controller.

[0051] The vehicle power supply system in this application is equipped with two buses: the first bus (the vehicle's main public CAN communication bus) and the second bus (a dedicated CAN communication bus). The gateway can establish communication connections with the thermal management controller, battery management system, and high-voltage electric drive controller via the first bus; at the same time, the thermal management controller can also establish a dedicated communication connection with the battery management system via the second bus.

[0052] In an optional embodiment, when the BMS controller in the battery management system detects that the vehicle in the OFF gear has a low-voltage power demand and controls the DCDC controller to convert the high-voltage electricity output by the power battery into low-voltage electricity, so as to use the low-voltage electricity output by the DCDC controller to power the low-voltage power components, if it is detected that the temperature of the battery management system is higher than the temperature threshold, the battery management system can directly send the battery temperature signal to the thermal management controller through the second bus. After receiving the battery temperature signal, the thermal management controller will trigger its internal compressor controller to perform heat dissipation processing on the BMS controller according to the battery temperature signal. In this way, the second bus can be directly used to achieve efficient communication and heat dissipation control between the battery management system and the thermal management controller without waking up other controllers in the vehicle network, thereby reducing the low-voltage power burden and improving the energy efficiency and reliability of the system.

[0053] like Figure 3 As shown, Figure 3 For the communication connection between the gateway and the thermal management controller, battery management system, high-voltage electric drive controller, and DCDC controller in the related technology, it is obvious that in the attached Figure 3In the process, the gateway can communicate with the thermal management controller, battery management system, high-voltage electric drive controller, and DCDC controller respectively through the third bus. In this application scenario, the BMS controller in the battery management system detects that the vehicle in the OFF gear has a low-voltage power demand, and the entire vehicle needs to be high-voltage to wake up the DCDC controller and the thermal management controller. The high-voltage electricity output by the power battery is converted into low-voltage electricity through the DCDC controller, and the low-voltage electricity output by the DCDC controller is used to power the low-voltage electrical components. The thermal management controller is used to dissipate heat for the BMS controller according to the battery temperature signal. However, in this process, the gateway and high-voltage electric drive controller will also be awakened, causing a large number of controllers in the vehicle to be active, significantly increasing the low-voltage power burden and reducing the vehicle's standby time and energy efficiency.

[0054] Therefore, in this application, the DCDC controller can be integrated into the battery management system, and a second bus can be added to enable the thermal management controller to establish a dedicated communication connection with the battery management system through the second bus. In this way, the low-voltage power demand of the vehicle can be met only by the collaborative work of the battery management system and the thermal management controller, without waking up other controllers in the vehicle network. This can significantly reduce the low-voltage power burden, extend the vehicle's standby time, and improve the energy efficiency and reliability of the system. In addition, communicating through a dedicated second bus can also improve communication efficiency, reduce signal interference, and further optimize system performance.

[0055] Furthermore, if Figure 2 As shown, the system further includes: The domain controller is electrically connected to the output end of the low-voltage battery, and the domain controller is powered by the low-voltage electricity output by the low-voltage battery.

[0056] The domain controller is electrically connected to the output end of the DCDC controller, and the DCDC controller outputs low voltage electricity to the domain controller.

[0057] The domain controller may be used as a controller corresponding to low-voltage electrical components of a vehicle that is in the OFF gear and has low-voltage power demand.

[0058] In the present application, the input end of the domain controller can be electrically connected to the output end of the low-voltage battery to supply the domain controller with the low-voltage electricity output by the low-voltage battery; and the input end of the domain controller can be electrically connected to the output end of the DCDC controller to supply the domain controller with the low-voltage electricity output by the DCDC controller.

[0059] That is to say, in the embodiment of the present application, when the low-voltage battery has sufficient power, the domain controller can be supplied with low-voltage power based on the low-voltage power output by the low-voltage battery. When the low-voltage battery has insufficient power or the low-voltage battery fails, the domain controller can be supplied with low-voltage power based on the low-voltage power output by the DCDC controller.

[0060] like Figure 4 As shown, Figure 4 This is a circuit connection diagram of a vehicle power supply system in the related art. Figure 4 In the embodiment, the output end of the power battery is electrically connected to the input end of the thermal management controller, the output end of the power battery is electrically connected to the front drive controller, the output end of the power battery is electrically connected to the rear drive controller, and the output end of the power battery is electrically connected to the input end of the DCDC controller; the output end of the DCDC controller is electrically connected to the input end of the low-voltage battery, and the output end of the low-voltage battery is electrically connected to the input end of the domain controller.

[0061] However, the embodiment of the present application provides a vehicle power supply system, such as Figure 2 As shown, in the battery management system in the present application, the DCDC controller can be integrated into the power battery, the input end of the low-voltage battery can be electrically connected to the output end of the DCDC controller, and the output end of the low-voltage battery can be electrically connected to the domain controller; the input end of the domain controller can be electrically connected to the output end of the DCDC controller, and can also be electrically connected to the output end of the low-voltage battery.

[0062] The output end of the power battery can also be electrically connected to the input end of the thermal management controller (with a compressor controller integrated in it), and the output end of the power battery can also be electrically connected to the high-voltage electric drive controller (front drive controller, rear drive controller), and a high-voltage relay is arranged between the power battery and the high-voltage electric drive controller (the first relay is electrically connected to the negative pole of the power battery; the second relay is electrically connected to the positive pole of the power battery).

[0063] An embodiment of the present application provides a vehicle power supply method, which is applied to a BMS controller in any of the aforementioned vehicle power supply systems. The method includes: S110: When it is detected that the vehicle in the OFF gear has a low-voltage power demand, the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller is cut off, and the DCDC controller is controlled to convert the high-voltage power output by the power battery into low-voltage power, so that the low-voltage power output by the DCDC controller can be used to power low-voltage electrical components.

[0064] In this application, when the BMS controller in the battery management system detects that the vehicle in the OFF gear has a low-voltage power demand, it can cut off the circuit that the power battery uses to provide high-voltage power to the high-voltage electric drive controller, and control the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power, so as to use the low-voltage power output by the DCDC controller to power low-voltage power components, thereby avoiding waking up the vehicle's high-voltage system and power domain network, avoiding a large number of controllers in an active state, and significantly reducing the low-voltage power burden.

[0065] In an optional embodiment, when it is detected that the power level of the low-voltage battery of a vehicle in the OFF gear is less than a power threshold, the circuit through which the power battery provides high voltage power to the high-voltage electric drive controller is cut off, and the DCDC controller is controlled to convert the high voltage power output by the power battery into low voltage power, so that the low voltage power output by the DCDC controller can be used to replenish the power of the low-voltage battery.

[0066] In another optional embodiment, when it is detected that a low-voltage battery of a vehicle in the OFF gear has a fault and there is a demand for low-voltage electricity, the circuit for the power battery to provide high-voltage electricity to the high-voltage electric drive controller is cut off, and the DCDC controller is controlled to convert the high-voltage electricity output by the power battery into low-voltage electricity, so that the low-voltage electricity output by the DCDC controller can be used to power the domain controller.

[0067] In this application, the DCDC controller in the power battery has three functions: one is to convert the high voltage electricity output by the power battery into low voltage electricity; one is to replenish the low voltage battery based on the low voltage electricity converted by the DCDC controller; and one is to replenish the domain controller based on the low voltage electricity converted by the DCDC controller.

[0068] In an embodiment of the present application, when the temperature of the BMS controller is higher than a temperature threshold, a battery temperature signal is sent to a thermal management controller, so that the thermal management controller performs heat dissipation processing on the BMS controller according to the battery temperature signal.

[0069] In an optional embodiment, a temperature monitoring module may be provided inside the BMS controller to monitor the temperature of the BMS controller. When the temperature of the BMS controller is higher than a temperature threshold, a battery temperature signal is sent to the thermal management controller. The thermal management controller receives the battery temperature signal sent by the temperature detection module inside the BMS controller, and performs heat dissipation and / or cooling processing on the BMS controller based on the compressor controller according to the battery temperature signal.

[0070] This embodiment provides a vehicle power supply method. Through the above-mentioned method, when the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it can disconnect the circuit that the power battery uses to supply high-voltage power to the high-voltage electric drive controller, and control the DCDC controller to convert the high-voltage power output of the power battery into low-voltage power, so that the low-voltage power output of the DCDC controller can be used to power low-voltage power components. Because the DCDC controller is integrated into the battery management system and can disconnect the circuit that the power battery uses to supply high-voltage power to the high-voltage electric drive controller, it can avoid waking up the entire vehicle's high-voltage system and power domain network, thereby preventing a large number of controllers from being active, thereby significantly reducing the low-voltage power burden. It can also extend the vehicle's standby time in a static state, improve the vehicle's energy efficiency and ease of use, while also reducing the potential failure risks that may be caused by waking up too many components, thereby enhancing the reliability and stability of the system. In addition, by requiring only the BMS controller and thermal management controller to operate to meet low-voltage power demand, the low-voltage power consumption of the entire vehicle is further reduced. This method not only extends the vehicle's standby time when stationary, improves the vehicle's energy efficiency and ease of use, but also reduces the potential failure risks caused by waking up too many components, and enhances the reliability and stability of the system.

[0071] like Figure 5 As shown, an embodiment of the present application further provides a vehicle, which includes the vehicle power supply system as described above.

[0072] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] An embodiment of the present application provides a computer-readable storage medium having program code stored therein, wherein the program code can be invoked by a processor to execute the method described in the above method embodiment.

[0074] The computer-readable storage medium can be an electronic memory such as a flash memory, an EEPROM (Electrically Erasable Programmable Read-Only Memory), an EPROM, a hard disk, or a ROM. Alternatively, the computer-readable storage medium includes a non-transitory computer-readable storage medium. The computer-readable storage medium has storage space for program codes for executing any of the method steps described above. These program codes can be read from or written to one or more computer program products. The program codes can be compressed, for example, in an appropriate form.

[0075] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, devices, or computer program products. Therefore, the embodiments of the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0076] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0077] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0078] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0079] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0080] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0081] The above describes in detail the provided vehicle power supply system, method, and vehicle. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A vehicle power supply system, characterized in that: The system comprises: Battery management system, which is equipped with: BMS controller; power battery; low-voltage battery; DCDC controller; High-voltage electric drive controller; When the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it cuts off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller, and controls the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power; The input end of the low-voltage battery is connected to the output end of the DCDC controller, and the low-voltage electricity output by the DCDC controller is used to power low-voltage electrical components.

2. The system according to claim 1, wherein: The system further comprises: A high-voltage relay is provided between the power battery and the high-voltage electric drive controller; When the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it cuts off the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller, including: When the BMS controller detects that the vehicle in the OFF gear has a low-voltage power demand, it controls the high-voltage relay to be disconnected.

3. The system according to claim 2, characterized in that The high-voltage electric drive controller includes a front drive controller and a rear drive controller; the high-voltage relay includes a first relay and a second relay, wherein the first relay is electrically connected to the negative pole of the power battery, and the second relay is electrically connected to the positive pole of the power battery.

4. The system according to claim 1, wherein: The system further comprises: thermal management controllers and gateways; The gateway is communicatively connected with the thermal management controller, the battery management system and the high-voltage electric drive controller respectively through a first bus; The thermal management controller is communicatively connected to the battery management system via a second bus.

5. The system according to claim 1, wherein: The system further comprises: The domain controller is electrically connected to the output end of the low-voltage battery, and the domain controller is powered by the low-voltage electricity output by the low-voltage battery.

6. The system according to claim 1, wherein: The system further comprises: The domain controller is electrically connected to the output end of the DCDC controller, and the DCDC controller outputs low voltage electricity to the domain controller.

7. The system according to claim 1, wherein: When the BMS controller detects that the power level of the low-voltage battery is less than a power threshold in the vehicle in the OFF gear, it cuts off the circuit through which the power battery supplies high-voltage power to the high-voltage electric drive controller, and controls the DCDC controller to convert the high-voltage power output by the power battery into low-voltage power; The input end of the low-voltage battery is connected to the output end of the DCDC controller, and the low-voltage electricity output by the DCDC controller is used to replenish the low-voltage battery.

8. A vehicle power supply method, characterized in that: The method applied to the BMS controller in the vehicle power supply system according to any one of claims 1 to 7 includes: When it is detected that the vehicle in the OFF gear has a low-voltage power demand, the circuit for the power battery to provide high-voltage power to the high-voltage electric drive controller is cut off, and the DCDC controller is controlled to convert the high-voltage power output by the power battery into low-voltage power, so that the low-voltage power output by the DCDC controller can be used to power low-voltage electrical components.

9. The method according to claim 8, characterized in that The method further comprises: When it is detected that the power level of the low-voltage battery of a vehicle in the OFF gear is less than the power threshold, the circuit through which the power battery provides high-voltage power to the high-voltage electric drive controller is cut off, and the DCDC controller is controlled to convert the high-voltage power output by the power battery into low-voltage power, so that the low-voltage power output by the DCDC controller can be used to replenish the power of the low-voltage battery.

10. The method according to claim 8 or 9, characterized in that The method further comprises: When the temperature of the BMS controller is higher than a temperature threshold, a battery temperature signal is sent to a thermal management controller, so that the thermal management controller performs heat dissipation processing on the BMS controller according to the battery temperature signal.

11. A vehicle, characterized in that: including one or more processors and memory; One or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs are configured to execute the vehicle power supply method according to any one of claims 8 to 10.

12. A computer-readable storage medium, characterized in that The computer-readable storage medium stores program code, wherein when the program code is run, the vehicle power supply method according to any one of claims 8 to 10 is executed.

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