Power supply control method and device, electronic equipment and storage medium

Abstract

The invention provides a power supply control method and device, electronic equipment and a storage medium, and relates to the technical field of vehicles. The power supply control method is applied to the power supply system, the power supply system comprises a first DC / DC and a second DC / DC which are connected with a high-voltage battery, the first DC / DC and the second DC / DC are respectively connected with a low-voltage load, and the power supply control method comprises the following steps: when the high-voltage battery is in a power-off state and the first DC / DC stops working, the high-voltage battery is powered on, and the first DC / DC stops working; controlling the second DC / DC to be converted into a working state from a dormant state; and the working mode of the second DC / DC is controlled according to the vehicle state. The low-voltage power supply task can be automatically taken over when the main power supply fails, power failure of a low-voltage system of the whole vehicle is avoided, power failure of the system caused by low-voltage battery power shortage when the load is large can be avoided, and therefore the power supply continuity and safety of the power supply system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a power supply control method and device, electronic equipment and storage medium. BACKGROUND

[0002] The battery system of an electric vehicle is the core energy source of the vehicle power and control system, which usually includes high-voltage battery system and low-voltage battery system, respectively providing driving energy and low-voltage control energy for the vehicle.

[0003] In the traditional battery system of an electric vehicle, when the vehicle is powered on on the high-voltage system, the power supply of the low-voltage system is usually completed by a high-power DC / DC converter (high-voltage battery provides high-voltage power, and the low-voltage system is powered after being stepped down) and a low-voltage battery, and after the high-voltage system is powered off, the low-voltage battery is completely dependent on the low-voltage battery for independent power supply. Since the low-voltage battery is prone to power loss under high load conditions, if the low-voltage system fails, it may cause the key controller to be powered off, causing potential safety risks. SUMMARY

[0004] The problem solved by the present application is to improve the safety of the low-voltage power supply.

[0005] To solve the above problems, the present application provides a power supply control method, device, electronic equipment and storage medium.

[0006] In a first aspect, the present application provides a power supply control method applied to a power supply system, wherein the power supply system includes a first DC / DC and a second DC / DC connected with a high-voltage battery, the first DC / DC and the second DC / DC are respectively connected with a low-voltage load, and the power supply control method includes: When the high-voltage battery is in a powered-off state and the first DC / DC stops working, controlling the second DC / DC to switch from a dormant state to a working state; Controlling the working mode of the second DC / DC according to the state of the vehicle.

[0007] Optionally, the controlling the working mode of the second DC / DC according to the state of the vehicle includes: When the vehicle is stationary, responding to a control instruction, supplying power to a basic function module of the vehicle through the second DC / DC; When the vehicle is in motion, responding to a control instruction, supplying power to a safe driving function module of the vehicle through the second DC / DC.

[0008] Optionally, the power supply system further includes a low-voltage battery, the low-voltage battery is respectively connected with the first DC / DC, the second DC / DC and the low-voltage load, and the controlling the working mode of the second DC / DC according to the state of the vehicle further includes: Charging the low-voltage battery by the second DC / DC in response to the control instruction when the vehicle is in an idle state.

[0009] Optionally, the charging the low-voltage battery by the second DC / DC comprises: controlling the second DC / DC to adopt a constant voltage mode to charge the low-voltage battery when a difference between an output voltage of the second DC / DC and a voltage of the low-voltage battery is less than a preset voltage difference; controlling the second DC / DC to adopt a constant current mode to charge the low-voltage battery when the difference between the output voltage of the second DC / DC and the voltage of the low-voltage battery is greater than the preset voltage difference.

[0010] Optionally, the power supply control method further comprises: when the low-voltage battery is abnormal, supplying power by the first DC / DC and the second DC / DC in combination or by the first DC / DC, and the second DC / DC as backup power supply.

[0011] Optionally, the power supply control method further comprises: when the vehicle is in a parking mode, supplying power to an external load and / or an internal load by the second DC / DC and the low-voltage battery; when the vehicle is without the external load, the internal load is in a dormant state, and the low-voltage battery is in a full power state, controlling the second DC / DC to transit from the working state to the dormant state until the power and / or voltage of the low-voltage battery drops to a corresponding preset threshold, and then controlling the second DC / DC to transit from the dormant state to the working state again.

[0012] Optionally, the power supply control method further comprises: adjusting the power output of the second DC / DC according to a power state of the high-voltage battery.

[0013] In a second aspect, the present application provides a power supply control device applied to a power supply system, the power supply system comprising a first DC / DC and a second DC / DC connected with a high-voltage battery, the first DC / DC and the second DC / DC being connected with a low-voltage load respectively, the power supply control device comprising: a first module configured to control the second DC / DC to transit from a dormant state to a working state when the high-voltage battery is in a power-off state and the first DC / DC stops working; a second module configured to control a working mode of the second DC / DC according to a vehicle state.

[0014] In a third aspect, the present application provides an electronic device comprising a memory and a processor. The memory is configured to store the computer program. The processor is configured to implement the power supply control method according to the first aspect when executing the computer program.

[0015] In a fourth aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the power supply control method according to the first aspect is implemented.

[0016] The power supply control method has the following advantages: when the high-voltage battery is in a power-off state and the first DC / DC stops working, the second DC / DC is controlled to switch from a dormant state to a working state, and the working mode of the second DC / DC is controlled according to the vehicle state, so that the low-voltage power supply task can be automatically taken over when the main power supply fails, the second DC / DC and the low-voltage battery can jointly supply power to the low-voltage load when the low-voltage battery exists, the low-voltage load that can be supported by the joint power supply of the second DC / DC and the low-voltage battery is more than the low-voltage load that can be supported by the low-voltage battery alone, and the load supporting capability is stronger, and the second DC / DC can guarantee low-voltage power supply when the low-voltage battery does not exist, so that the vehicle low-voltage system can be prevented from losing power, the low-voltage battery can be prevented from being discharged to cause the system to lose power when the load is large, and thus the power supply continuity and safety of the power supply system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is a flowchart of the power supply control method of the embodiment of the present application. Figure 2 The figure is a schematic architecture of the power supply system of the embodiment of the present application. Figure One ; Figure 3 The figure is a schematic architecture of the power supply system of the embodiment of the present application. Figure Two ; Figure 4 The figure is a schematic architecture of the power supply system of the embodiment of the present application. Figure Three ; Figure 5 The figure is a schematic architecture of the power supply system of the embodiment of the present application. Figure 6 The figure is a flowchart of the working mode control of the second DC / DC of the embodiment of the present application. Figure 7 The figure is a flowchart of the low-voltage battery charging of the embodiment of the present application. Figure 8 The figure is a system architecture diagram of the power supply control device of the embodiment of the present application. Figure 9 The figure is a system architecture diagram of the electronic device of the embodiment of the present application. DETAILED DESCRIPTION

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the description below. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0023] like Figure 1 As shown in the figure, an embodiment of the present invention provides a power control method applied to a power system. The power system includes a first DC / DC converter and a second DC / DC converter connected to a high-voltage battery. The first DC / DC converter and the second DC / DC converter are respectively connected to a low-voltage load. The power control method includes: S100: When the high-voltage battery is in a power-off state and the first DC / DC stops working, control the second DC / DC to switch from a sleep state to a working state.

[0024] Specifically, in combination Figure 2As shown, the power supply system of the embodiment includes a first DC / DC (i.e., large DC / DC) and a second DC / DC (i.e., small DC / DC) connected with the high-voltage battery, the first DC / DC is connected with the high-voltage battery through a control switch, the second DC / DC is directly connected with the high-voltage battery, and the first DC / DC and the second DC / DC are used to convert the output of the high-voltage battery into low voltage, and can also be reversely converted; when the high-voltage battery is powered on, the main positive and main negative switches are closed, the first DC / DC works, outputs low-voltage electricity to supply power to the low-voltage load such as the controller and can charge the low-voltage battery, at this time the second DC / DC enters a dormant or shutdown state and does not work, and when the high-voltage battery is in a powered-off state and the first DC / DC stops working, the second DC / DC is switched from the dormant state to the working state.

[0025] Among them, the power of the first DC / DC is usually kilowatt level, adopts full-bridge rectification architecture, usually works when the whole vehicle starts, and can supply power to the electrical load of the whole vehicle, and the power of the second DC / DC is usually hundred-watt level, adopts LLC half-bridge architecture, usually works when the vehicle is parked and stopped, and can supply power to the load such as mobile phone.

[0026] Among them, the first DC / DC, the second DC / DC, the BMS and other controllers can be connected through a communication bus (such as CAN bus) and exchange data.

[0027] S200: controlling the working mode of the second DC / DC according to the vehicle state.

[0028] Specifically, for example, when the vehicle is stationary, the second DC / DC supplies power to the basic functions (such as opening the door, locking the door, closing the window, etc.), and when the vehicle is running, the second DC / DC supplies power to the safe driving functions (such as driving, main steering, braking, etc.).

[0029] In the embodiment, by controlling the second DC / DC to switch from the dormant state to the working state when the high-voltage battery is in a powered-off state and the first DC / DC stops working, and controlling the working mode of the second DC / DC according to the vehicle state, the low-voltage power supply task can be automatically taken over when the main power supply fails, the second DC / DC and the low-voltage battery can jointly supply power to the low-voltage load, the low-voltage load that can be supported by the two common power supply is more than the low-voltage load that can be supported by the low-voltage battery alone, and the load supporting capability is stronger, when there is no low-voltage battery, the second DC / DC can guarantee low-voltage power supply, so the power supply continuity and safety of the power supply system can be improved.

[0030] Optionally, the controlling the working mode of the second DC / DC according to the vehicle state comprises: S210: when the vehicle is stationary, in response to a control instruction, power is supplied to the basic function module of the vehicle by the second DC / DC.

[0031] Specifically, in combination with Figure 6 As shown, when the vehicle is stationary, the second DC / DC receives CAN communication or hard-wired signal of the BMS or other controller to start working, the vehicle driving system receives the instruction to prohibit working, the vehicle cannot walk, and other functions are normal and display a prompt failure; when the low-voltage battery has a low power and gradually decreases, that is, the charging power of the second DC / DC to the low-voltage battery is less than the load power, only the basic functions such as failure display, opening and closing the door, and closing the window are retained, other functions are prohibited from starting, and after the personnel leave and lock the vehicle, the second DC / DC is in an intermittent working state after the low-voltage battery is fully charged.

[0032] S220: when the vehicle is in motion, in response to a control instruction, power is supplied to the safe driving function module of the vehicle by the second DC / DC.

[0033] Specifically, in combination with Figure 6 As shown, when the vehicle is in motion, the second DC / DC receives CAN communication or hard-wired signal of the BMS or other controller to start working, the driving, main steering, brake, and other safe driving functions continue to work. The driver is prompted with a failure and speed limited, non-driving functions such as entertainment are closed to reduce low-voltage power consumption; the failure can also be transmitted to an automatic driving strategy controller, the controller automatically closes unnecessary functions, turns on a safety warning light, reduces the speed to a safety threshold, and repositions the nearest safety point to go to the safety point for parking as soon as possible after the customer or self-selection.

[0034] In the optional embodiment, when the vehicle is stationary, only the basic functions such as door locking and failure prompting are retained to reduce energy consumption, and when the vehicle is in motion, only the safe driving functions such as steering, braking, and driving are powered to ensure basic driving safety and ensure that even if the main power fails, the minimum safe driving ability can be maintained.

[0035] Optionally, the power supply system further comprises a low-voltage battery, the low-voltage battery is connected with the first DC / DC, the second DC / DC, and the low-voltage load respectively, and the control of the working mode of the second DC / DC according to the vehicle state further comprises: when the vehicle is in an idle state, in response to a control instruction, the second DC / DC charges the low-voltage battery.

[0036] Specifically, in combination with Figure 3 As shown, the power supply system further comprises a low-voltage battery, the low-voltage battery is connected with the first DC / DC, the second DC / DC, and the low-voltage load respectively, and when the vehicle is in an idle state (for example, the user leaves and locks the vehicle), the second DC / DC can charge the low-voltage battery according to the control instruction.

[0037] As shown in the combination of Figure 4 The low-voltage battery can be a secondary battery such as a lead-acid storage battery or a lithium battery. If a lithium battery is used, a low-voltage BMS needs to be added. The low-voltage BMS can be connected in communication with other controllers and BMSs, can adjust the output current size in real time according to the current limiting instruction of the low-voltage BMS, and can control the input and output state of the low-voltage battery through the low-voltage BMS. If the voltage of the low-voltage battery reaches the upper limit, the charging circuit can be limited to continue charging. If the voltage of the low-voltage battery reaches the lower limit, the discharging circuit can be limited to discharge. In an extreme case such as a fault, the low-voltage battery can be limited to charge and discharge.

[0038] In this optional embodiment, the second DC / DC is used to charge the low-voltage battery, thereby providing a backup charging path for the low-voltage battery. In the case where the first DC / DC cannot charge or the vehicle is powered off, the low-voltage battery can still maintain the power, thereby avoiding power failure of the system caused by power loss of the low-voltage battery.

[0039] Optionally, the charging of the low-voltage battery by the second DC / DC includes: S231: When the difference between the output voltage of the second DC / DC and the voltage of the low-voltage battery is less than a preset voltage difference, the second DC / DC is controlled to adopt a constant voltage mode to charge the low-voltage battery.

[0040] Specifically, in combination with Figure 7 As shown in the combination of For a lithium battery sensitive to current, the second DC / DC can adopt a constant voltage + constant current output mode. When the output voltage of the second DC / DC is close to the voltage of the low-voltage battery, for example, when the difference between the output voltage of the second DC / DC and the voltage of the low-voltage battery is less than a preset voltage difference (for example, 0.5V), the second DC / DC adopts a constant voltage mode to charge the low-voltage battery.

[0041] If the low-voltage battery is a lead-acid storage battery that is not sensitive to current, the second DC / DC can adopt a constant voltage mode to charge the low-voltage battery.

[0042] S232: When the difference between the output voltage of the second DC / DC and the voltage of the low-voltage battery is greater than the preset voltage difference, the second DC / DC is controlled to adopt a constant current mode to charge the low-voltage battery.

[0043] Figure 7 Specifically, in combination with As shown in the combination of

[0044] When the difference between the output voltage of the second DC / DC and the voltage of the low-voltage battery is greater than the preset voltage difference, the second DC / DC adopts a constant current mode to charge the low-voltage battery, thereby avoiding excessive current from affecting the low-voltage battery.

[0045] In the optional embodiment, the second DC / DC is controlled according to the voltage difference to control the constant voltage / constant current charging mode, so as to avoid battery overheating, shortened life and even safety risks caused by excessive charging current, and improve the safety and life management level of the vehicle battery system.

[0046] Optionally, the power supply control method further comprises: When the low-voltage battery is abnormal, power is supplied by the first DC / DC and the second DC / DC in combination, or by the first DC / DC and the second DC / DC in standby.

[0047] Specifically, when the low-voltage battery is abnormal, power can be supplied by the first DC / DC and the second DC / DC in combination, or in the form of power supplied by the first DC / DC and standby power supplied by the second DC / DC as shown in the figure. Figure 5 In order to improve efficiency, a switch can be connected in parallel with the diode, and the switch is closed when the second DC / DC supplies power, and otherwise the switch is opened.

[0048] In the optional embodiment, when the low-voltage battery is abnormal, power is supplied by the first DC / DC and the second DC / DC in combination, or by the first DC / DC and the second DC / DC in standby, so as to ensure continuous power supply for key systems through multi-power supply cooperation.

[0049] Optionally, the power supply control method further comprises: When the vehicle is in the parking mode, the second DC / DC and the low-voltage battery supply power to the external load and / or the internal load; When the vehicle has no external load, the internal load is in the sleep state, and the low-voltage battery is in the full power state, the second DC / DC is controlled to switch from the working state to the sleep state, and when the power and / or voltage of the low-voltage battery decreases to the corresponding preset threshold value, the second DC / DC is controlled to switch from the sleep state to the working state again.

[0050] Specifically, when the vehicle is in the parking mode (i.e., the vehicle is not powered on), if there is an external mobile load such as a mobile phone charger, a vehicle-mounted electrical appliance, etc., the second DC / DC and the low-voltage battery continuously supply power, and the internal load is also continuously supplied with power by the second DC / DC and the low-voltage battery.

[0051] When there is no external load and the internal load is basically dormant, the output current is monitored to be minimal, and the second DC / DC enters an intermittent working state after the low-voltage battery is fully charged, that is, when the low-voltage battery is fully charged, the second DC / DC stops working and enters a dormant or shutdown state, and through monitoring the voltage or capacity of the low-voltage battery, when the voltage of the low-voltage battery drops to a certain capacity or voltage, the second DC / DC is awakened or started to charge the low-voltage battery by an external signal, and then enters the dormant or shutdown state again after being fully charged.

[0052] When the user equipment has a high load, the user can be limited to use power to ensure that the whole vehicle works normally.

[0053] In the optional embodiment, the second DC / DC and the low-voltage battery supply power in the parking mode, support providing power to external / internal loads (such as a sentinel mode, USB charging, etc.) when the vehicle is parked, and avoid the low-voltage battery from being depleted due to independent long-time power supply.

[0054] Optionally, the power supply control method further comprises: Adjusting the power output of the second DC / DC according to the state of charge of the high-voltage battery.

[0055] Specifically, when the high-voltage battery has a low capacity, the high-voltage BMS can notify other controllers through communication, and the working state of each controller in this state is decided by the main controller such as the vehicle controller, and part or all of the controllers can be stopped from being powered, and the DC / DC power output can be limited or stopped, for example, when the high-voltage battery has a capacity of A, the power output of the second DC / DC is limited, and when the high-voltage battery has a capacity of B, the power output of the second DC / DC is stopped, wherein B

[0056] In the optional embodiment, the power output of the second DC / DC is adjusted according to the state of charge of the high-voltage battery, and when the high-voltage battery has a low capacity, the low-voltage power supply power is automatically reduced or non-critical functions are turned off, the power supply time is prolonged, and the low-voltage power supply is effectively prevented from being depleted too early.

[0057] As shown in Figure 8 The power supply control device 800 provided by the embodiment of the application is applied to a power supply system, the power supply system includes a first DC / DC and a second DC / DC connected with a high-voltage battery, the first DC / DC and the second DC / DC are respectively connected with a low-voltage load, and the power supply control device 800 includes: A first module 810 is configured to control the second DC / DC to switch from a dormant state to a working state when the high-voltage battery is in a power-off state and the first DC / DC stops working. A second module 820 is configured to control the working mode of the second DC / DC according to the state of the vehicle.

[0058] AsFigure 9 As shown, an electronic device 900 provided by an embodiment of the present application includes a memory 920 and a processor 910; the memory 920 is configured to store a computer program; the processor 910 is configured to implement the power control method as described above when executing the computer program.

[0059] Alternatively, an electronic device 900 includes a memory 920 and a processor 910 coupled to the memory 920; the memory 920 is configured to store a computer program; the processor 910 is configured to execute the following operations when executing the computer program: when the high-voltage battery is in a powered-off state and the first DC / DC is stopped, controlling the second DC / DC to switch from a dormant state to an active state; controlling the working mode of the second DC / DC according to the vehicle state.

[0060] A computer readable storage medium provided by an embodiment of the present application has a computer program stored thereon, and when the computer program is executed by a processor, the power control method as described above is implemented.

[0061] Alternatively, a non-volatile computer readable storage medium has a computer program stored thereon, and when the computer program is executed by a processor, the processor executes the following operations: when the high-voltage battery is in a powered-off state and the first DC / DC is stopped, controlling the second DC / DC to switch from a dormant state to an active state; controlling the working mode of the second DC / DC according to the vehicle state.

[0062] An electronic device 900 that can be a server or a client of the present application will now be described, which is an example of a hardware device that can be applied to various aspects of the present application. The electronic device 900 is intended to represent various forms of digital electronic computing devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computing devices. The electronic device 900 can also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the present application described and / or claimed in this document.

[0063] The electronic device 900 includes a computing unit that can perform various appropriate actions and processes in accordance with a computer program stored in a read only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for device operation can also be stored. The computing unit, the ROM, and the RAM are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus.

[0064] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer readable storage medium. When the program is executed, the processes of the above-mentioned embodiment methods can be included. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM), a random access memory (RAM), or the like. In this application, the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place or distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present application. In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0065] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A power supply control method, characterized in that, The power supply system includes a first DC / DC converter and a second DC / DC converter connected to a high-voltage battery, the first DC / DC converter and the second DC / DC converter being connected to a low-voltage load respectively, and the power control method includes: When the high-voltage battery is powered off and the first DC / DC converter stops working, the second DC / DC converter is controlled to switch from a sleep state to a working state. The operating mode of the second DC / DC is controlled according to the vehicle status.

2. The power control method according to claim 1, characterized in that, The operating mode of controlling the second DC / DC according to the vehicle status includes: When the vehicle is stationary, in response to control commands, the vehicle's basic functional modules are powered via the second DC / DC converter; When the vehicle is in motion, in response to control commands, the second DC / DC power supply is used to power the vehicle's safety driving function module.

3. The power control method according to claim 2, characterized in that, The power system further includes a low-voltage battery, which is connected to the first DC / DC converter, the second DC / DC converter, and the low-voltage load, respectively. The step of controlling the operating mode of the second DC / DC converter according to the vehicle status further includes: When the vehicle is idle, in response to a control command, the low-voltage battery is charged via the second DC / DC converter.

4. The power control method according to claim 3, characterized in that, The charging of the low-voltage battery via the second DC / DC converter includes: When the difference between the output voltage of the second DC / DC converter and the voltage of the low-voltage battery is less than a preset voltage difference, the second DC / DC converter is controlled to adopt a constant voltage mode to charge the low-voltage battery. When the difference between the output voltage of the second DC / DC converter and the voltage of the low-voltage battery is greater than the preset voltage difference, the second DC / DC converter is controlled to adopt a constant current mode to charge the low-voltage battery.

5. The power control method according to claim 3, characterized in that, Also includes: When the low-voltage battery malfunctions, power is supplied by a combination of the first DC / DC and the second DC / DC, or by the first DC / DC and the second DC / DC as a backup power source.

6. The power control method according to claim 3, characterized in that, Also includes: When the vehicle is in parking mode, power is supplied to external loads and / or internal loads via the second DC / DC converter and the low-voltage battery. When the vehicle has no external load, the internal load is in a dormant state, and the low-voltage battery is fully charged, the second DC / DC converter is controlled to switch from the operating state to the dormant state until the charge and / or voltage of the low-voltage battery drops to the corresponding preset threshold, at which point the second DC / DC converter is controlled to switch from the dormant state back to the operating state.

7. The power control method according to any one of claims 1 to 6, characterized in that, Also includes: The power output of the second DC / DC converter is adjusted according to the state of charge of the high-voltage battery.

8. A power control device, characterized in that, The power supply system includes a first DC / DC converter and a second DC / DC converter connected to a high-voltage battery, the first DC / DC converter and the second DC / DC converter being connected to a low-voltage load respectively, and the power control device includes: The first module is used to control the second DC / DC to switch from a dormant state to an active state when the high-voltage battery is in a powered-off state and the first DC / DC stops working. The second module is used to control the operating mode of the second DC / DC based on the vehicle status.

9. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to implement the power control method as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, implements the power control method as described in any one of claims 1 to 7.

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