Vehicle power supply system, method and vehicle

Abstract

This application discloses a vehicle power supply system, method, and vehicle. The system includes: a fuel cell, a power battery, a first converter, and a second converter. The fuel cell is connected to the first converter; the power battery is connected to a voltage distribution module via a first switching element and is electrically connected to the first converter via the first switching element; the power battery is connected to the second converter via a second switching element; the first converter and the second converter are electrically connected to each other, and both are connected to the voltage distribution module to supply power to target devices connected to the voltage distribution module. This application solves the technical problem that using a lower-voltage power battery may not match the voltage output of the fuel cell after voltage boosting, leading to the current prevalence of high-voltage platforms in vehicle power supply systems and resulting in higher overall vehicle costs.

Description

Technical Field

[0001] This application relates to the field of vehicle battery technology, and more specifically, to a vehicle power supply system, method, and vehicle. Background Technology

[0002] A fuel cell vehicle is a car that uses an onboard fuel cell engine to generate electricity to power the vehicle or charge its battery. It features high energy conversion efficiency, low pollution, and no noise. The fuel cell stack generates high-voltage electricity, which is then regulated and boosted by a DC-DC converter for use in charging the battery or supplying power to high-voltage equipment.

[0003] To ensure proper system operation, the voltage output from the fuel cell via the boost DC-DC converter must match the bus voltage; otherwise, an error will occur, causing the system to malfunction. However, using a low-voltage battery may not match the voltage value of the fuel cell after boosting by the DC-DC converter. This has led to the current widespread use of high-voltage platforms in vehicles, with equipment such as air conditioning compressors and PTC heaters also employing the same voltage platform, resulting in higher overall vehicle costs.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This application provides a vehicle power supply system, method, and vehicle to at least solve the technical problem that the use of low-voltage power batteries may not be able to match the voltage output of fuel cells after voltage boosting, which leads to the current use of high-voltage platforms in vehicle power supply and the resulting high vehicle cost.

[0006] According to one aspect of the embodiments of this application, a vehicle power supply system is provided, including: a fuel cell, a power battery, a first converter, and a second converter, wherein the fuel cell is connected to the first converter, and the first converter is used to convert DC power with a first voltage value output by the fuel cell into DC power with a second voltage value, wherein the first voltage value is not greater than the second voltage value; the power battery is connected to a voltage distribution module through a first switching element, and the power battery is electrically connected to the first converter through the first switching element; the power battery is connected to the second converter through a second switching element, wherein the second converter is used to convert DC power with a third voltage value output by the power battery into DC power with a fourth voltage value, or to convert DC power with a fourth voltage value input to the power battery into DC power with a third voltage value, wherein the third voltage value is not greater than the fourth voltage value; the first converter and the second converter are electrically connected to each other, and both the first converter and the second converter are connected to the voltage distribution module to supply power to a target device connected to the voltage distribution module.

[0007] Optionally, the vehicle power supply system further includes: a control module, wherein the control module is used to determine the driving mode of the vehicle power supply system based on the state of charge value of the power battery, and to control the opening and closing of the first switching element and the second switching element, including: the control module is used to determine the driving mode as the first driving mode when the state of charge value of the power battery is greater than the charge threshold, and to control the first switching element to close and the second switching element to open, wherein the charge threshold is determined based on the first voltage value; the control module is used to determine the driving mode as the second driving mode when the state of charge value of the power battery is not greater than the charge threshold, and to control the first switching element to open and the second switching element to close.

[0008] Optionally, the control module is also used to control the fuel cell and power battery to supply power to the target device based on the drive type and the power supply mode of the vehicle power supply system.

[0009] Optionally, when the drive type is the first drive type or the second drive type, and the power supply mode of the vehicle power supply system is the first power supply mode, the control module is used to set the power battery to a dormant state and control the fuel cell to output DC power of a second voltage value through the first converter to power the target device. In the dormant state, the power battery does not output, and the second voltage value is determined by the control module according to the power of the target device.

[0010] Optionally, when the drive type is the first drive type and the power supply mode of the vehicle power supply system is the second power supply mode, the control module is used to control the fuel cell to be in a dormant state and control the power battery to directly output DC power of the third voltage value to power the target device, wherein the fuel cell does not output in the dormant state.

[0011] Optionally, when the drive type is the second drive type and the power supply mode of the vehicle power supply system is the second power supply mode, the control module is used to control the fuel cell to be in a dormant state and control the power battery to output DC power of the fourth voltage value through the second converter to power the target device. In the dormant state, the fuel cell does not output, and the fourth voltage value is determined by the control module according to the power of the target device.

[0012] Optionally, when the drive type is the first drive type and the power supply mode of the vehicle power supply system is the third power supply mode, the control module is used to control the fuel cell to output DC power of the second voltage value through the first converter, and to control the power battery to directly output DC power of the third voltage value, and the DC power of the second voltage value and the DC power of the third voltage value jointly power the target device, wherein the second voltage value is equal to the third voltage value.

[0013] Optionally, when the drive type is the second drive type and the power supply mode of the vehicle power supply system is the third power supply mode, the control module is used to control the fuel cell to output DC power of the second voltage value through the first converter, and to control the power battery to output DC power of the fourth voltage value through the second converter, and the DC power of the second voltage value and the DC power of the fourth voltage value are used together to power the target device, wherein the second voltage value is equal to the fourth voltage value.

[0014] Optionally, when the drive type is the first drive type and the power supply mode of the vehicle power supply system is the fourth power supply mode, the control module is used to control the fuel cell to output DC power of the second voltage value through the first converter to power the target device, and to directly input the DC power of the second voltage value to the power battery to charge the power battery.

[0015] Optionally, when the drive type is the second drive type and the power supply mode of the vehicle power supply system is the fourth power supply mode, the control module is used to control the fuel cell to output DC power of the second voltage value through the first converter to power the target device, and input the DC power of the second voltage value to the power battery through the second converter to charge the power battery.

[0016] According to another aspect of the embodiments of this application, a vehicle power supply method is also provided, comprising: determining a power supply mode; determining a driving form of the vehicle power supply system based on the state of charge value of a power battery, and controlling the opening and closing of a first switching element and a second switching element; supplying power to a target device by controlling a fuel cell and a power battery according to the power supply mode and the driving form, wherein the fuel cell is connected to a first converter, the first converter being used to convert DC power of a first voltage value output by the fuel cell into DC power of a second voltage value, the first voltage value not being greater than the second voltage value; the power battery being connected to a voltage distribution module through a first switching element, and the power battery being electrically connected to the first converter through the first switching element; the power battery being connected to a second converter through a second switching element, wherein the second converter being used to convert DC power of a third voltage value output by the power battery into DC power of a fourth voltage value, or to convert DC power of a fourth voltage value input to the power battery into DC power of a third voltage value, the third voltage value not being greater than the fourth voltage value; the first converter and the second converter being electrically connected to each other, and both the first converter and the second converter being connected to the voltage distribution module to supply power to a target device connected to the voltage distribution module.

[0017] According to another aspect of the embodiments of this application, a vehicle is also provided, in which a vehicle power supply system is operated.

[0018] In this embodiment, a fuel cell, a power battery, a first converter, and a second converter are employed. The fuel cell is connected to the first converter, which converts a first voltage value (DC) output from the fuel cell into a second voltage value (DC). The first voltage value is not greater than the second voltage value. The power battery is connected to a voltage distribution module via a first switching element and is electrically connected to the first converter via the same element. The power battery is connected to the second converter via a second switching element, which converts a third voltage value (DC) output from the power battery into a fourth voltage value (DC), or converts a fourth voltage value (DC) input to the power battery into a third voltage value (DC). The third voltage value is not greater than the fourth voltage value. The voltage value; the first converter and the second converter are electrically connected, and both the first converter and the second converter are connected to the voltage distribution module to supply power to the target device connected to the voltage distribution module. The bidirectional DC-DC converter (second converter) adjusts the voltage at the output terminal of the power battery so that the bus voltage of the fuel cell engine and the bus voltage at the output terminal of the power battery are matched. The switch in the control system is closed or opened by voltage detection to control whether the bidirectional DC-DC converter is working. This achieves the purpose of ensuring the normal operation of the fuel cell system, and solves the technical problem that the use of a lower voltage power battery may not be able to match the voltage value output by the fuel cell after the voltage is boosted, which leads to the current use of high voltage platforms in vehicle power supply and the resulting high vehicle cost. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a schematic diagram of a vehicle power supply system according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the drive mode determination logic of a vehicle power supply system according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the control logic for various power supply modes of a vehicle power supply system under a first driving mode, according to an embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the control logic for various power supply modes of a vehicle power supply system under a second drive mode, according to an embodiment of this application.

[0024] Figure 5This is a hardware structure block diagram of a computer terminal (or electronic device) for implementing a method for powering a vehicle, according to an embodiment of this application.

[0025] Figure 6 This is a schematic diagram of a method for supplying power to a vehicle according to an embodiment of this application;

[0026] Figure 7 This is a schematic diagram of a vehicle power supply device provided according to an embodiment of this application. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] To ensure the normal operation of the system, the voltage output by the fuel cell through the boost DC-DC converter needs to match the bus voltage; otherwise, an error will occur. For example, when the SOC (State of Charge) of the power battery is too low, and the power battery voltage is at a lower value in the operating voltage range, it will be lower than the output voltage of the fuel cell through the boost DC-DC converter. In this case, the boost DC-DC converter will report an error, causing the system to malfunction.

[0030] In related technologies, most vehicles currently use high-voltage platforms, such as platforms with approximately 600V or higher voltage. Equipment such as air conditioning compressors or PTC heaters also use the same voltage platform, resulting in high overall vehicle costs. To address this issue, this application provides relevant solutions, which are detailed below.

[0031] According to an embodiment of this application, an embodiment of a vehicle power supply system is provided. Figure 1 This is a schematic diagram of a vehicle power supply system according to an embodiment of this application. Figure 1 As shown, the system includes: a fuel cell 10, a power battery 12, a first converter 14, and a second converter 16, wherein...

[0032] Fuel cell 10 is connected to first converter 14, wherein first converter 14 is used to convert DC power with a first voltage value output by fuel cell 10 into DC power with a second voltage value, wherein the first voltage value is not greater than the second voltage value;

[0033] The aforementioned fuel cell is used to convert fuel in a vehicle into electrical energy through a chemical reaction; the fuel cell is connected to a boost DC-DC converter (i.e., the aforementioned first converter) to form a fuel cell engine.

[0034] Among them, the boost DC-DC converter (i.e., the first converter mentioned above) plays the role of regulating the output voltage of the fuel cell, and boosting the output voltage of the fuel cell (first voltage value) to the high voltage bus voltage (second voltage value).

[0035] The power battery 12 is connected to the voltage distribution module 18 through the first switching element, and the power battery 12 is electrically connected to the first converter 14 through the first switching element.

[0036] The power battery 12 is connected to the second converter 16 via the second switching element. The second converter 16 is used to convert the DC power output from the power battery 12 at a third voltage value to a fourth voltage value, or to convert the DC power input to the power battery 12 at a fourth voltage value to a third voltage value, wherein the third voltage value is not greater than the fourth voltage value.

[0037] like Figure 1 As shown, the power battery is connected to the high-voltage distribution box (voltage distribution module) via switch K1 (i.e., the first switching element mentioned above). The power battery is connected to the bidirectional DC-DC converter (i.e., the second converter mentioned above) via switch K2 (i.e., the second switching element mentioned above). Switch K1 (i.e., the first switching element mentioned above) is located between the power battery and the high-voltage distribution box, and is used to control the connection between the power battery and the high-voltage distribution box (voltage distribution module). Switch K2 (i.e., the second switching element mentioned above) is located between the power battery and the bidirectional DC-DC converter (i.e., the second converter mentioned above), and is used to control the connection between the power battery and the bidirectional DC-DC converter (i.e., the second converter mentioned above).

[0038] The aforementioned power battery is a storage battery used to provide power to the vehicle.

[0039] Among them, the bidirectional DC-DC converter (i.e., the second converter mentioned above) plays the role of regulating the output voltage of the power battery, adjusting the output voltage of the power battery (third voltage value) to the high voltage bus voltage (fourth voltage value), preventing the output voltage of the power battery from being lower than the output voltage of the boost DC-DC converter of the fuel cell engine (i.e., the first converter mentioned above), so as to avoid the boost DC-DC converter (i.e., the first converter mentioned above) reporting a fault.

[0040] In this embodiment, for ease of description, the fuel cell output voltage is denoted as V1 (corresponding to the first voltage value), the boosted voltage of the boosted DC-DC converter (i.e., the first converter mentioned above) is denoted as V2 (corresponding to the second voltage value), the power battery output voltage is denoted as V3 (corresponding to the third voltage value), and the bidirectional DC-DC converter (i.e., the second converter mentioned above) output voltage is denoted as V4 (corresponding to the fourth voltage value), as detailed below. Figure 1 As shown in the image.

[0041] The first converter 14 and the second converter 16 are electrically connected, and both the first converter 14 and the second converter 16 are connected to the voltage distribution module 18 to supply power to the target device connected to the voltage distribution module 18.

[0042] In some embodiments of this application, the target device connected to the voltage distribution module 18 includes at least one of the following: a motor, an air conditioning compressor, a third converter, and a heater, wherein the motor is used to drive the vehicle where the vehicle power supply system is located based on DC power of a second voltage value and / or DC power of a fourth voltage value; the air conditioning compressor is used to cool based on DC power of a second voltage value and / or DC power of a fourth voltage value; the third converter is used to convert DC power of a second voltage value and / or DC power of a fourth voltage value into DC power of a fifth voltage value to supply power to low-voltage equipment in the vehicle where the vehicle power supply system is located, wherein the fifth voltage value is less than the second voltage value or the fourth voltage value; and the heater is used to heat based on DC power of a second voltage value and / or DC power of a fourth voltage value.

[0043] Specifically, the boost DC-DC converter (i.e., the first converter mentioned above) is connected to the high-voltage distribution box (i.e., the voltage distribution module mentioned above), the bidirectional DC-DC converter (i.e., the second converter mentioned above) is connected to the high-voltage distribution box (i.e., the voltage distribution module mentioned above), and high-voltage devices such as motors, low-voltage DC-DC converters (i.e., the third converter mentioned above), PTC heaters, and air conditioning compressors are connected to the high-voltage busbar through the high-voltage distribution box.

[0044] In some embodiments of this application, the vehicle power supply system further includes a control module, wherein the control module is configured to determine the driving mode of the vehicle power supply system based on the state of charge value of the power battery 12, and control the opening and closing of the first switching element and the second switching element, including: the control module is configured to determine the driving mode as the first driving mode when the state of charge value of the power battery 12 is greater than the charge threshold, and control the first switching element to close and the second switching element to open, wherein the charge threshold is determined based on the first voltage value; the control module is configured to determine the driving mode as the second driving mode when the state of charge value of the power battery 12 is not greater than the charge threshold, and control the first switching element to open and the second switching element to close.

[0045] Figure 2 This is a schematic diagram illustrating the drive mode determination logic of a vehicle power supply system according to an embodiment of this application, such as... Figure 2 As shown.

[0046] Specifically, when the power battery is at a high SOC (i.e., when the state of charge of the power battery 12 is greater than the charge threshold), and V3 > V1, the driving mode is determined to be the first driving mode. Switch K1 (i.e., the first switching element mentioned above) is closed, switch K2 (i.e., the second switching element mentioned above) is open, the power battery is directly connected to the high voltage distribution box, and the bidirectional DC-DC converter (i.e., the second converter mentioned above) does not work, thus reducing energy loss.

[0047] When the power battery is at a low SOC (i.e., the state of charge of power battery 12 is not greater than the charge threshold), and V3 < V1, the boost DC-DC (i.e., the first converter mentioned above) will report an error, determine the drive mode as the second drive mode, open switch K1 (i.e., the first switching element mentioned above), close switch K2 (i.e., the second switching element mentioned above), and the power battery is connected to the high-voltage distribution box through the bidirectional DC-DC (i.e., the second converter mentioned above). The bidirectional DC-DC (i.e., the second converter mentioned above) starts to work, controlling the output voltage V4 of the power battery to match the output voltage of the fuel cell engine.

[0048] In some embodiments of this application, the control module is also used to control the fuel cell 10 and the power battery 12 to supply power to the target device according to the driving form and the power supply mode of the vehicle power supply system.

[0049] The following section provides a further introduction to the various power supply modes of the vehicle's power supply system in the first drive mode.

[0050] Figure 3 This is a schematic diagram of the control logic for various power supply modes of a vehicle power supply system under a first driving mode, according to an embodiment of this application. Figure 3 As shown.

[0051] In some embodiments of this application, when the drive type is a first drive type or a second drive type and the power supply mode of the vehicle power supply system is a first power supply mode, the control module is used to set the power battery 12 to a dormant state and control the fuel cell 10 to output DC power of a second voltage value through the first converter 14 to power the target device. In the dormant state, the power battery 12 does not output, and the second voltage value is determined by the control module according to the power of the target device.

[0052] Specifically, when the fuel cell is driven alone (powered solely by the high-voltage system), i.e., in the first power supply mode mentioned above, the power battery has no output, and the power battery output voltage V3 = 0V; the platform operating voltage is V2.

[0053] V2 varies with the power requirements of the high-voltage devices (i.e., the target equipment mentioned above).

[0054] In some embodiments of this application, when the driving form is the first driving form and the power supply mode of the vehicle power supply system is the second power supply mode, the control module is used to control the fuel cell 10 to be in a dormant state and control the power battery 12 to directly output DC power of the third voltage value to power the target device, wherein the fuel cell 10 does not output in the dormant state.

[0055] Specifically, when the power battery drives the system alone (powering the high-voltage system alone), i.e., in the second power supply mode mentioned above, the fuel cell engine has no output, the fuel cell output voltage V1 = 0V, the fuel cell engine output voltage V2 = 0V, and the platform operating voltage is V3.

[0056] In some embodiments of this application, when the driving form is the first driving form and the power supply mode of the vehicle power supply system is the third power supply mode, the control module is used to control the fuel cell 10 to output DC power of the second voltage value through the first converter 14, and to control the power battery 12 to directly output DC power of the third voltage value, and the DC power of the second voltage value and the DC power of the third voltage value are used together to power the target device, wherein the second voltage value is equal to the third voltage value.

[0057] Specifically, when the power battery and the fuel cell engine drive together (to jointly power the high-voltage system), that is, in the third power supply mode mentioned above, the power battery output voltage V3 = V2, and the platform operating voltage is V2.

[0058] In some embodiments of this application, when the drive form is the first drive form and the power supply mode of the vehicle power supply system is the fourth power supply mode, the control module is used to control the fuel cell 10 to output DC power of the second voltage value through the first converter 14 to power the target device, and to directly input the DC power of the second voltage value to the power battery 12 to charge the power battery 12.

[0059] Specifically, when the fuel cell is driving and charging the power battery at the same time, i.e., in the fourth power supply mode mentioned above, the output voltage of the fuel cell engine is V2 and the voltage of the power battery is V3. At this time, V2 > V3, the power battery is being charged, and the platform operating voltage is V2.

[0060] The following section provides a further introduction to the various power supply modes of the vehicle's power supply system in the second drive configuration.

[0061] Figure 4 This is a schematic diagram of the control logic for various power supply modes of a vehicle power supply system under a second drive mode, according to an embodiment of this application. Figure 4 As shown.

[0062] In some embodiments of this application, when the drive type is a first drive type or a second drive type and the power supply mode of the vehicle power supply system is a first power supply mode, the control module is used to set the power battery 12 to a dormant state and control the fuel cell 10 to output DC power of a second voltage value through the first converter 14 to power the target device. In the dormant state, the power battery 12 does not output, and the second voltage value is determined by the control module according to the power of the target device.

[0063] Specifically, when the fuel cell is driven alone (powered solely by the high-voltage system), i.e., in the first power supply mode mentioned above, the power battery has no output, and the power battery output voltage V3 = 0V, V4 = 0V; the platform operating voltage is V2.

[0064] In some embodiments of this application, when the drive type is the second drive type and the power supply mode of the vehicle power supply system is the second power supply mode, the control module is used to control the fuel cell 10 to be in a dormant state and control the power battery 12 to output DC power of the fourth voltage value through the second converter 16 to power the target device. In the dormant state, the fuel cell 10 does not output, and the fourth voltage value is determined by the control module according to the power of the target device.

[0065] Specifically, when the power battery drives the system alone (powering the high-voltage system alone), i.e., in the second power supply mode mentioned above, the fuel cell engine has no output, the fuel cell output voltage V1 = 0V, the fuel cell engine output voltage V2 = 0V, and the platform operating voltage is V4.

[0066] In some embodiments of this application, when the driving form is the second driving form and the power supply mode of the vehicle power supply system is the third power supply mode, the control module is used to control the fuel cell 10 to output DC power of the second voltage value through the first converter 14, and to control the power battery 12 to output DC power of the fourth voltage value through the second converter 16, and the DC power of the second voltage value and the DC power of the fourth voltage value are used together to power the target device, wherein the second voltage value is equal to the fourth voltage value.

[0067] Specifically, when the power battery and the fuel cell engine drive together (to jointly power the high-voltage system), i.e. the third power supply mode mentioned above, the power battery adjusts the output voltage V4 = V2 through bidirectional DC-DC regulation, and the platform operating voltage is V2.

[0068] In some embodiments of this application, when the drive type is the second drive type and the power supply mode of the vehicle power supply system is the fourth power supply mode, the control module is used to control the fuel cell 10 to output DC power of the second voltage value through the first converter 14 to power the target device, and input the DC power of the second voltage value to the power battery 12 through the second converter 16 to charge the power battery 12.

[0069] Specifically, when the fuel cell is driving and charging the power battery at the same time, i.e. the fourth power supply mode mentioned above, the fuel cell engine output voltage V2, the power battery output voltage V4 through the bidirectional DC-DC converter, and the power battery terminal voltage V3. At this time, V2 = V4 > V3, and the power battery is charged. The platform operating voltage is V2.

[0070] The system configuration proposed in this application adds a bidirectional DC-DC converter to adjust the battery output voltage, ensuring that the bus voltage of the fuel cell engine matches the bus voltage of the power battery output. This guarantees the normal operation of the fuel cell system, improves the versatility of high-voltage electrical equipment, and reduces the overall vehicle cost. Furthermore, considering the efficiency loss that occurs during operation of the bidirectional DC-DC converter, a switch is added between the power battery and the bidirectional DC-DC converter, and another switch is added between the power battery and the high-voltage distribution box. Voltage detection controls the opening and closing of these switches, thereby controlling the operation of the bidirectional DC-DC converter, resulting in higher efficiency and greater energy savings.

[0071] Meanwhile, the vehicle power supply system of this application supports multiple control methods. In different modes, including: fuel cell engine driving alone, power battery driving alone, and fuel cell engine and power battery driving together, the output voltage is adjusted to ensure that the system can work normally.

[0072] According to an embodiment of this application, a method embodiment for powering a vehicle is also provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0073] The methods and embodiments provided in this application can be executed on mobile terminals, computer terminals, or similar computing devices. Figure 5 A hardware block diagram of a computer terminal (or electronic device) for implementing a vehicle power supply method is shown. Figure 5 As shown, the computer terminal 50 (or electronic device 50) may include one or more processors 502 (shown as 502a, 502b, ..., 502n in the figure) 502 (processor 502 may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 504 for storing data, and a transmission device 506 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of a BUS bus), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 5 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 50 may also include... Figure 5 The more or fewer components shown, or having the same Figure 5 The different configurations shown.

[0074] It should be noted that the aforementioned one or more processors 502 and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be wholly or partially integrated into any other element within the computer terminal 50 (or electronic device). As involved in the embodiments of this application, the data processing circuits serve as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0075] The memory 504 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the vehicle power supply method in this embodiment. The processor 502 executes various functional applications and data processing by running the software programs and modules stored in the memory 504, thereby realizing the aforementioned vehicle power supply method. The memory 504 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 504 may further include memory remotely located relative to the processor 502, and these remote memories can be connected to the computer terminal 50 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0076] The transmission device 506 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the computer terminal 50. In one example, the transmission device 506 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 506 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0077] The display can be, for example, a touchscreen liquid crystal display (LCD) that allows a user to interact with the user interface of the computer terminal 50 (or electronic device).

[0078] Under the above operating environment, this application provides a vehicle power supply method. Figure 6 This is a schematic diagram of a vehicle power supply method according to an embodiment of this application, such as... Figure 6 As shown, the method includes the following steps:

[0079] Step S602: Determine the power supply mode;

[0080] Step S604: Based on the state of charge value of the power battery, determine the driving mode of the vehicle power supply system and control the opening and closing of the first switching element and the second switching element.

[0081] Step S606: Based on the power supply mode and drive form, power is supplied to the target device by controlling the fuel cell and the power battery. The fuel cell is connected to a first converter, which converts the DC power output from the fuel cell at a first voltage value to a second voltage value, where the first voltage value is not greater than the second voltage value. The power battery is connected to the voltage distribution module via a first switching element and is electrically connected to the first converter via the first switching element. The power battery is connected to a second converter via a second switching element, where the second converter converts the DC power output from the power battery at a third voltage value to a fourth voltage value, or converts the DC power input to the power battery at a fourth voltage value to a third voltage value, where the third voltage value is not greater than the fourth voltage value. The first converter and the second converter are electrically connected, and both are connected to the voltage distribution module to supply power to the target device connected to the voltage distribution module.

[0082] In some embodiments of this application, the driving mode of the vehicle power supply system is determined based on the state of charge (SOC) value of the power battery, and the opening and closing of the first and second switching elements are controlled. This includes: when the SOC value of the power battery is greater than a charge threshold, the driving mode is determined to be a first driving mode, and the first switching element is controlled to close and the second switching element is controlled to open, wherein the charge threshold is determined based on a first voltage value; when the SOC value of the power battery is not greater than the charge threshold, the driving mode is determined to be a second driving mode, and the first switching element is controlled to open and the second switching element is controlled to close.

[0083] In some embodiments of this application, powering a target device by controlling a fuel cell and a power battery according to the power supply mode and drive form includes: when the drive form is a first drive form or a second drive form, and the power supply mode of the vehicle power supply system is the first power supply mode, setting the power battery to a dormant state, and controlling the fuel cell to output DC power of a second voltage value through a first converter to power the target device, wherein the power battery does not output in the dormant state, and the second voltage value is determined by the control module according to the power of the target device.

[0084] When the drive mode is the first drive mode and the power supply mode of the vehicle power supply system is the second power supply mode, the fuel cell is controlled to be in a dormant state, and the power battery is controlled to directly output DC power of the third voltage value to power the target device. The fuel cell does not output power in the dormant state.

[0085] When the drive type is the second drive type and the power supply mode of the vehicle power supply system is the second power supply mode, the fuel cell is controlled to be in a dormant state, and the power battery is controlled to output DC power of the fourth voltage value through the second converter to power the target device. In the dormant state, the fuel cell does not output, and the fourth voltage value is determined by the control module according to the power of the target device.

[0086] When the drive mode is the first drive mode and the power supply mode of the vehicle power supply system is the third power supply mode, the fuel cell is controlled to output DC power of the second voltage value through the first converter, and the power battery is controlled to directly output DC power of the third voltage value. The DC power of the second voltage value and the DC power of the third voltage value are used together to power the target device, wherein the second voltage value is equal to the third voltage value.

[0087] When the drive type is the second drive type and the power supply mode of the vehicle power supply system is the third power supply mode, the fuel cell is controlled to output DC power of the second voltage value through the first converter, and the power battery is controlled to output DC power of the fourth voltage value through the second converter. The DC power of the second voltage value and the DC power of the fourth voltage value are used together to power the target device, wherein the second voltage value is equal to the fourth voltage value.

[0088] When the drive mode is the first drive mode and the power supply mode of the vehicle power supply system is the fourth power supply mode, the fuel cell is controlled to output DC power of the second voltage value through the first converter to power the target device, and the DC power of the second voltage value is directly input to the power battery to charge the power battery.

[0089] When the drive mode is the second drive mode and the power supply mode of the vehicle power supply system is the fourth power supply mode, the fuel cell is controlled to output DC power of the second voltage value through the first converter to power the target device, and the DC power of the second voltage value is input to the power battery through the second converter to charge the power battery.

[0090] It should be noted that the vehicle power supply method provided in this embodiment is related to... Figure 1 The control method corresponding to the vehicle power supply system shown is also applicable to the embodiments of this application, and will not be repeated here.

[0091] Through the above steps, the output voltage of the power battery is adjusted by the bidirectional DC-DC converter (second converter) to match the bus voltage of the fuel cell engine with that of the power battery. Voltage detection is used to control the opening and closing of the switch in the system, thereby controlling whether the bidirectional DC-DC converter is working. This achieves the goal of ensuring the normal operation of the fuel cell system. In turn, it solves the technical problem that the use of a lower voltage power battery may not be able to match the voltage value output by the fuel cell after the voltage is boosted, which leads to the current use of high-voltage platforms in vehicle power supply and the resulting high vehicle cost.

[0092] According to an embodiment of this application, an embodiment of a vehicle power supply device is also provided. Figure 7 This is a structural schematic diagram of a vehicle power supply device according to an embodiment of this application. Figure 7 As shown, the device includes:

[0093] Power supply mode determination module 70, used to determine the power supply mode;

[0094] The drive mode determination module 72 is used to determine the drive mode of the vehicle power supply system based on the state of charge value of the power battery, and control the opening and closing of the first switching element and the second switching element.

[0095] The power supply control module 74 is used to supply power to the target device by controlling the fuel cell and the power battery according to the power supply mode and drive form. The fuel cell is connected to a first converter, which converts the DC power output from the fuel cell at a first voltage value to a second voltage value, where the first voltage value is not greater than the second voltage value. The power battery is connected to the voltage distribution module via a first switching element and is electrically connected to the first converter via the first switching element. The power battery is also connected to a second converter via a second switching element, where the second converter converts the DC power output from the power battery at a third voltage value to a fourth voltage value, or converts the DC power input to the power battery at a fourth voltage value to a third voltage value, where the third voltage value is not greater than the fourth voltage value. The first converter and the second converter are electrically connected, and both are connected to the voltage distribution module to supply power to the target device connected to the voltage distribution module.

[0096] It should be noted that each module in the above-mentioned vehicle power supply device can be a program module (for example, a set of program instructions to implement a certain function) or a hardware module. For the latter, it can be manifested in the following forms, but is not limited to them: each of the above modules is manifested as a processor, or the functions of each of the above modules are implemented by a processor.

[0097] It should be noted that the vehicle power supply device provided in this embodiment can be used to perform... Figure 6 The vehicle power supply method shown above is also applicable to the embodiments of this application, and will not be repeated here.

[0098] This application embodiment also provides a non-volatile storage medium, which includes a stored computer program. The device containing the non-volatile storage medium executes the following vehicle power supply method by running the computer program: determining a power supply mode; determining the drive mode of the vehicle power supply system based on the state of charge value of the power battery, and controlling the opening and closing of a first switching element and a second switching element; and supplying power to the target device by controlling the fuel cell and the power battery according to the power supply mode and drive mode. The fuel cell is connected to a first converter, which converts the DC power output from the fuel cell at a first voltage value to a second voltage value. The voltage is greater than the second voltage value; the power battery is connected to the voltage distribution module through the first switching element, and the power battery is electrically connected to the first converter through the first switching element; the power battery is connected to the second converter through the second switching element, wherein the second converter is used to convert the DC power of the third voltage value output by the power battery into DC power of the fourth voltage value, or to convert the DC power of the fourth voltage value input to the power battery into DC power of the third voltage value, the third voltage value being no greater than the fourth voltage value; the first converter and the second converter are electrically connected to each other, and both the first converter and the second converter are connected to the voltage distribution module to supply power to the target device connected to the voltage distribution module.

[0099] This application also provides a vehicle, in which a vehicle is running... Figure 1 The vehicle power supply system is shown. Therefore, the explanations and descriptions of the above-described vehicle power supply system also apply to the embodiments of this application, and will not be repeated here.

[0100] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0101] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0102] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0103] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0104] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0105] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0106] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A vehicle power supply system, characterized in that, include: Fuel cell, power battery, first converter and second converter, wherein, The fuel cell is connected to the first converter, wherein the first converter is used to convert the DC power output by the fuel cell at a first voltage value into DC power at a second voltage value, wherein the first voltage value is not greater than the second voltage value; The power battery is connected to the voltage distribution module through a first switching element, and the power battery is electrically connected to the first converter through the first switching element. The power battery is connected to the second converter via a second switching element, wherein the second converter is used to convert the DC power output by the power battery at a third voltage value to a fourth voltage value, or to convert the DC power input to the power battery at a fourth voltage value to a third voltage value, wherein the third voltage value is not greater than the fourth voltage value. The first converter and the second converter are electrically connected, and both the first converter and the second converter are connected to the voltage distribution module to supply power to the target device connected to the voltage distribution module; The vehicle power supply system further includes a control module, wherein the control module is configured to determine the driving mode of the vehicle power supply system based on the state of charge (SBC) value of the power battery, and control the opening and closing of the first switching element and the second switching element, including: the control module is configured to determine the driving mode as a first driving mode when the SBC value of the power battery is greater than a charge threshold, and control the first switching element to close and the second switching element to open, wherein the charge threshold is determined based on the first voltage value; the control module is configured to determine the driving mode as a second driving mode when the SBC value of the power battery is not greater than the charge threshold, and control the first switching element to open and the second switching element to close.

2. The vehicle power supply system according to claim 1, characterized in that, The control module is also used to control the fuel cell and the power battery to supply power to the target device according to the drive type and the power supply mode of the vehicle power supply system.

3. The vehicle power supply system according to claim 2, characterized in that, When the drive type is the first drive type or the second drive type, and the power supply mode of the vehicle power supply system is the first power supply mode, The control module is used to set the power battery to a dormant state and control the fuel cell to output DC power of the second voltage value through the first converter to power the target device. In the dormant state, the power battery does not output DC power, and the second voltage value is determined by the control module based on the power of the target device.

4. The vehicle power supply system according to claim 2, characterized in that, When the drive type is the first drive type and the power supply mode of the vehicle power supply system is the second power supply mode, The control module is used to control the fuel cell to be in a dormant state and to control the power battery to directly output DC power of the third voltage value to power the target device, wherein the fuel cell does not output in the dormant state.

5. The vehicle power supply system according to claim 4, characterized in that, When the drive type is the second drive type and the power supply mode of the vehicle power supply system is the second power supply mode, The control module is used to control the fuel cell to be in a dormant state and to control the power battery to output DC power of the fourth voltage value through the second converter to power the target device. In the dormant state, the fuel cell does not output DC power, and the fourth voltage value is determined by the control module based on the power of the target device.

6. The vehicle power supply system according to claim 2, characterized in that, When the drive type is the first drive type and the power supply mode of the vehicle power supply system is the third power supply mode, The control module is used to control the fuel cell to output DC power of the second voltage value through the first converter, and to control the power battery to directly output DC power of the third voltage value, and the DC power of the second voltage value and the DC power of the third voltage value are used together to power the target device, wherein the second voltage value is equal to the third voltage value.

7. The vehicle power supply system according to claim 6, characterized in that, When the drive type is the second drive type and the power supply mode of the vehicle power supply system is the third power supply mode, The control module is used to control the fuel cell to output DC power of the second voltage value through the first converter, and to control the power battery to output DC power of the fourth voltage value through the second converter, and the DC power of the second voltage value and the DC power of the fourth voltage value are used together to power the target device, wherein the second voltage value is equal to the fourth voltage value.

8. The vehicle power supply system according to claim 2, characterized in that, When the drive type is the first drive type and the power supply mode of the vehicle power supply system is the fourth power supply mode, The control module is used to control the fuel cell to output DC power of the second voltage value through the first converter to power the target device, and to directly input the DC power of the second voltage value to the power battery to charge the power battery.

9. The vehicle power supply system according to claim 8, characterized in that, When the drive type is the second drive type and the power supply mode of the vehicle power supply system is the fourth power supply mode, The control module is used to control the fuel cell to output DC power of the second voltage value through the first converter to power the target device, and to input the DC power of the second voltage value to the power battery through the second converter to charge the power battery.

10. A method for supplying power to a vehicle, characterized in that, include: Determine the power supply mode; Based on the state of charge value of the power battery, the driving mode of the vehicle power supply system is determined, and the opening and closing of the first and second switching elements are controlled. Based on the power supply mode and the drive form, power is supplied to the target device by controlling the fuel cell and the power battery. The fuel cell is connected to a first converter, which converts the DC power output from the fuel cell at a first voltage value to a second voltage value, where the first voltage value is not greater than the second voltage value. The power battery is connected to a voltage distribution module via a first switching element and is electrically connected to the first converter via the first switching element. The power battery is connected to a second converter via a second switching element, where the second converter converts the DC power output from the power battery at a third voltage value to a fourth voltage value, or converts the DC power input to the power battery at a fourth voltage value to a third voltage value, where the third voltage value is not greater than the fourth voltage value. The first converter and the second converter are electrically connected, and both are connected to the voltage distribution module to supply power to the target device connected to the voltage distribution module. The method further includes: when the state of charge value of the power battery is greater than the charge threshold, determining the driving mode as a first driving mode, and controlling the first switching element to close and the second switching element to open, wherein the charge threshold is determined based on the first voltage value; when the state of charge value of the power battery is not greater than the charge threshold, determining the driving mode as a second driving mode, and controlling the first switching element to open and the second switching element to close.

11. A vehicle, characterized in that, The vehicle is equipped with a vehicle power supply system as described in any one of claims 1 to 9.

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