CN-121989691-A - Vehicle power supply method, vehicle-mounted terminal and vehicle

CN121989691ACN 121989691 ACN121989691 ACN 121989691ACN-121989691-A

Abstract

The application relates to a vehicle power supply method, a vehicle-mounted terminal and a vehicle. The method comprises the steps of controlling the second DCDC converter to conduct voltage reduction processing on a first voltage output by the low-voltage storage battery to supply power for a low-voltage electric system during running of the vehicle, detecting power supply states of the low-voltage storage battery and the high-voltage power battery, and controlling the first DCDC converter to conduct voltage boosting processing on the first voltage to supply power for the power system when power supply abnormality of the low-voltage storage battery is not detected and power supply abnormality of the high-voltage power battery is detected. By adopting the method, the safe movement of the vehicle can be ensured after the failure of the main power.

Inventors

WU JIALIN
LIU BING
LI YI
SHI ZITAO
LI WEI
LI MIN

Assignees

重庆蓝电汽车科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260317

Claims (10)

1. A vehicle power supply method characterized in that the vehicle is provided with a high-voltage power battery, a low-voltage battery, a first direct current-direct current (DCDC) converter connecting the low-voltage battery and a power system of the vehicle, and a second DCDC converter connecting the low-voltage battery and a low-voltage power system of the vehicle, the first DCDC converter and the second DCDC converter being connected in parallel, the method comprising: during the running of the vehicle, controlling the second DCDC converter to perform step-down processing on the first voltage output by the low-voltage storage battery so as to supply power to the low-voltage power system, and Detecting the power supply state of the low-voltage storage battery and the high-voltage power battery; And under the condition that the power supply abnormality of the low-voltage storage battery is not detected and the power supply abnormality of the high-voltage power battery is detected, controlling a first DCDC converter to boost the first voltage so as to supply power for the power system.
2. The method according to claim 1, wherein the method further comprises: And under the condition that the power supply abnormality of the high-voltage power battery is not detected, controlling the high-voltage power battery to supply power for the power system.
3. The method of claim 1, wherein the first DCDC converter is a bi-directional DCDC converter, and wherein the method further comprises: Controlling the high-voltage power battery to output a second voltage to the first DCDC converter under the condition that the vehicle is parked at a preset charging position and the external power supply is adopted to supply power to the high-voltage power battery; And controlling the first DCDC converter to carry out step-down treatment on the second voltage so as to charge the low-voltage storage battery.
4. The method according to any one of claims 1-3, wherein the vehicle is further provided with a third DCDC converter connecting the high voltage power cell with the low voltage electrical system, the method further comprising: And under the condition that the power supply abnormality of the low-voltage storage battery is detected and the power supply abnormality of the high-voltage power battery is not detected, controlling the third DCDC converter to carry out step-down processing on the third voltage output by the high-voltage power battery so as to supply power for the low-voltage power system.
5. A method according to any one of claims 1-3, wherein the high voltage power cell and the low voltage battery are physically isolated.
6. A method according to any one of claims 1 to 3, wherein the low voltage battery comprises a plurality of cells arranged in a matrix and connected in series.
7. A method according to any one of claims 1-3, wherein said detecting the power supply status of said low voltage battery and said high voltage power battery comprises: Acquiring first state information of the high-voltage power battery and second state information of the low-voltage storage battery, wherein the state information comprises at least one of voltage, current, temperature and state of charge; determining that the high-voltage power battery is detected to be abnormally powered in the case that the first state information does not satisfy the first state condition, and And determining that the low-voltage storage battery power supply abnormality is detected in the case that the second state information does not meet a second state condition.
8. A method according to any one of claims 1-3, wherein in the event that no low voltage battery power abnormality is detected and the high voltage power battery power abnormality is detected, the method further comprises at least one of: the method comprises the steps of outputting prompt information, wherein the prompt information is used for prompting that the power system is powered by the low-voltage storage battery at present; And outputting estimated mileage, wherein the estimated mileage is determined according to the current available electric quantity of the low-voltage storage battery.
9. An in-vehicle terminal comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 8 when the computer program is executed.
10. A vehicle characterized by comprising a high-voltage power battery, a low-voltage battery, a first DCDC converter connecting the low-voltage battery and a power system of the vehicle, a second DCDC converter connecting the low-voltage battery and a low-voltage power system of the vehicle, and the in-vehicle terminal of claim 9, wherein the first DCDC converter and the second DCDC converter are connected in parallel.

Description

Vehicle power supply method, vehicle-mounted terminal and vehicle Technical Field The application relates to the technical field of new energy automobiles, in particular to a vehicle power supply method, a vehicle-mounted terminal and a vehicle. Background The power supply architecture of the traditional electric automobile generally adopts an architecture scheme of a high-voltage power battery (400V/800V) and a low-voltage storage battery, wherein the low-voltage storage battery is mainly a lead-acid battery or a small-capacity lithium battery and is mainly used for supplying power to a low-voltage power system (light, instrument, controller, sensor and the like) of the whole automobile, providing a starting power supply for the power on the high-voltage system and maintaining the basic function of the automobile after the power on the high-voltage system is off, and the power required by the running of the automobile is completely provided by the high-voltage power battery and a high-voltage power circuit. However, the low-voltage storage battery in the conventional architecture can only meet the requirements of low-voltage power load and control function, and cannot output the power and energy required for driving the vehicle. When the high-voltage power system fails or the automatic driving system enters a fault degradation state, the vehicle loses driving power, and the requirements of safe movement and risk avoidance of the vehicle after the failure of the main power under the automatic driving scene are difficult to meet. Disclosure of Invention In view of the foregoing, it is necessary to provide a vehicle power supply method, a vehicle-mounted terminal, and a vehicle capable of ensuring safe movement of the vehicle after failure of the main power. In a first aspect, the present application provides a vehicle power supply method, the vehicle being provided with a high-voltage power battery, a low-voltage battery, a first direct current-direct current (DCDC) converter connecting the low-voltage battery and a power system of the vehicle, and a second DCDC converter connecting the low-voltage battery and the low-voltage power system of the vehicle, the first DCDC converter and the second DCDC converter being connected in parallel, the method comprising: During the running of the vehicle, the second DCDC converter is controlled to carry out the step-down treatment on the first voltage output by the low-voltage storage battery so as to supply power to the low-voltage power system, and Detecting the power supply state of the low-voltage storage battery and the high-voltage power battery; and under the condition that the low-voltage storage battery power supply abnormality is not detected and the high-voltage power battery power supply abnormality is detected, controlling the first DCDC converter to carry out boosting treatment on the first voltage so as to supply power for the power system. In one embodiment, the method further comprises controlling the high voltage power battery to supply power to the power system in the event that no power supply abnormality of the high voltage power battery is detected. In one embodiment, the first DCDC converter is a bidirectional DCDC converter, and the method further comprises controlling the high-voltage power battery to output a second voltage to the first DCDC converter when the vehicle is parked at a preset charging position and the external power supply is adopted to supply power to the high-voltage power battery, and controlling the first DCDC converter to carry out step-down processing on the second voltage so as to charge the low-voltage storage battery. In one embodiment, the vehicle is further provided with a third DCDC converter for connecting the high-voltage power battery and the low-voltage power system, and the method further comprises controlling the third DCDC converter to step down the third voltage output by the high-voltage power battery to supply power to the low-voltage power system when the power supply abnormality of the low-voltage storage battery is detected and the power supply abnormality of the high-voltage power battery is not detected. In one embodiment, the high voltage power cell and the low voltage battery are physically isolated. In one embodiment, the low voltage battery includes a plurality of cells arranged in a matrix and connected in series. In one embodiment, power supply state detection is performed on a low-voltage storage battery and a high-voltage power battery, and the power supply state detection comprises the steps of acquiring first state information of the high-voltage power battery and second state information of the low-voltage storage battery, wherein the state information comprises at least one of voltage, current, temperature and state of charge, determining that the power supply of the high-voltage power battery is abnormal when the first state information does not meet the first state condition, and determinin