CN-122008873-A - Battery thermal runaway protection method, device, vehicle, medium and program product

Abstract

The present disclosure relates to a battery thermal runaway protection method, apparatus, vehicle, medium, and program product. The method comprises the steps of responding to thermal runaway of a first battery pack when the first battery pack and a second battery pack are connected in series to supply power, controlling the first battery pack to be electrically isolated from a high-voltage loop, switching a connection mode of the first battery pack and the second battery pack, controlling the second battery pack to independently supply power for the high-voltage loop, and driving a cooling system to cool the first battery pack by utilizing electric energy provided by the second battery pack. Therefore, when the first battery pack is in thermal runaway, the first battery pack is electrically isolated from the high-voltage loop, and the whole system can be prevented from being influenced by fault expansion. By switching the connection mode of the first battery pack and the second battery pack, the second battery pack is independently powered, and continuous operation of the device under abnormal conditions can be ensured. Meanwhile, the electric energy provided by the second battery pack is used for driving the cooling system to cool the first battery pack, so that the problem of insufficient power supply of the low-voltage storage battery can be avoided, and the heat diffusion can be effectively restrained.

Inventors

• LI MINGQIANG

Assignees

• 小米汽车科技有限公司

Dates

Publication Date

20260512

Application Date

20260327

Claims (14)

1. 1. A method of thermal runaway protection of a battery, comprising: controlling the first battery pack to be electrically isolated from a high-voltage loop in response to thermal runaway of the first battery pack when the first battery pack and the second battery pack are powered in series; Switching a connection mode of the first battery pack and the second battery pack, and controlling the second battery pack to independently supply power for the high-voltage loop; and driving a cooling system to cool the first battery pack by utilizing the electric energy provided by the second battery pack.
2. 2. The method of claim 1, wherein said using the electrical energy provided by the second battery pack to drive a cooling system to cool the first battery pack comprises: supplying power to a high-voltage compression component of the cooling system by utilizing the electric energy output by the second battery pack; The temperature of the cooling water is reduced by the high-pressure cooling part to cool the first battery pack.
3. 3. The method of claim 1, wherein said using the electrical energy provided by the second battery pack to drive a cooling system to cool the first battery pack comprises: Converting the voltage output by the second battery pack into a first target voltage by using a voltage conversion module; providing the first target voltage to a water pump of the cooling system; and driving cooling water circulation by using the water pump so as to cool the first battery pack.
4. 4. The method of claim 1, wherein said using the electrical energy provided by the second battery pack to drive a cooling system to cool the first battery pack comprises: Converting the voltage output by the second battery pack into a second target voltage by using a voltage conversion module; Providing the second target voltage to an actuator of a three-way valve of the cooling system; And adjusting the flow rate of cooling water flowing through the first battery pack by controlling the opening degree of the three-way valve so as to cool the first battery pack.
5. 5. The method according to claim 1, wherein the method further comprises: and increasing the opening of a branch which leads to the first battery pack in a three-way valve of the cooling system.
6. 6. The method of claim 1, wherein the step of determining the position of the substrate comprises, A change-over switch is arranged between the first battery pack and the second battery pack, and the change-over switch is used for enabling the first battery pack and the second battery pack to be switched into a series mode or a parallel mode; the first battery pack is connected with the first end of the high-voltage loop through a first relay, and the second battery pack is connected with the second end of the high-voltage loop through a second relay; The switching the connection mode of the first battery pack and the second battery pack, and controlling the second battery pack to independently supply power to the high-voltage loop, includes: Controlling the first relay and the second relay to be disconnected; Controlling the action of the change-over switch to switch the first battery pack and the second battery pack from a series mode to a parallel mode; And controlling the first relay to maintain an open state and controlling the second relay to be closed so as to control the second battery pack to independently supply power for the high-voltage loop.
7. 7. The method of claim 6, wherein fuses are disposed between the first and second battery packs and the switch, respectively, and wherein controlling the first battery pack to be electrically isolated from the high voltage circuit comprises: a fuse connected between the first battery pack and the change-over switch is disconnected.
8. 8. A thermal runaway protection device for a battery, comprising: the first control module is used for responding to the first battery pack to generate thermal runaway when the first battery pack and the second battery pack are in series power supply, and controlling the first battery pack to be electrically isolated from the high-voltage loop; the second control module is used for switching the connection mode of the first battery pack and the second battery pack and controlling the second battery pack to independently supply power for the high-voltage loop; and the third control module is used for driving the cooling system to cool the first battery pack by utilizing the electric energy provided by the second battery pack.
9. 9. The apparatus of claim 8, wherein the third control module comprises: And the first control submodule is used for supplying power to a high-pressure refrigeration component of the cooling system by utilizing the electric energy output by the second battery pack, and reducing the temperature of cooling water by utilizing the high-pressure refrigeration component so as to cool the first battery pack.
10. 10. The apparatus of claim 8, wherein the third control module comprises: The second control sub-module is used for converting the voltage output by the second battery pack into a first target voltage by utilizing the voltage conversion module, providing the first target voltage for a water pump of the cooling system, and driving cooling water to circulate by utilizing the water pump so as to cool the first battery pack.
11. 11. The apparatus of claim 8, wherein the third control module comprises: The third control sub-module is used for converting the voltage output by the second battery pack into a second target voltage by utilizing the voltage conversion module, providing the second target voltage for an actuator of a three-way valve of the cooling system, and adjusting the flow of cooling water flowing through the first battery pack by controlling the opening of the three-way valve so as to cool the first battery pack.
12. 12. A vehicle, characterized by comprising: A processor; A memory for storing processor-executable instructions; Wherein the processor is configured to execute the executable instructions in the memory to implement the steps of the battery thermal runaway protection method of any of claims 1-7.
13. 13. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the battery thermal runaway protection method according to any one of claims 1 to 7.
14. 14. A computer program product comprising a computer program which, when executed by a processor, implements the steps of the battery thermal runaway protection method of any one of claims 1 to 7.

Description

Battery thermal runaway protection method, device, vehicle, medium and program product Technical Field The present disclosure relates to the field of battery control, and more particularly to a battery thermal runaway protection method, apparatus, vehicle, medium and program product. Background The multi-battery pack power supply system has been widely used in the fields of electric vehicles and the like by virtue of advantages such as long endurance. However, when an emergency such as thermal runaway occurs in a certain battery pack, there are significant drawbacks to the existing countermeasures. If only the failed battery pack is isolated, the thermal runaway diffusion cannot be effectively prevented. Moreover, when a fault occurs, a cooling system driven by a low-voltage storage battery of the whole vehicle may have the problem of insufficient power supply, so that the cooling system is invalid and serious safety accidents are caused. Disclosure of Invention To overcome the problems in the related art, the present disclosure provides a battery thermal runaway protection method, apparatus, vehicle, medium, and program product. According to a first aspect of embodiments of the present disclosure, there is provided a thermal runaway protection method of a battery, including: controlling the first battery pack to be electrically isolated from a high-voltage loop in response to thermal runaway of the first battery pack when the first battery pack and the second battery pack are powered in series; Switching a connection mode of the first battery pack and the second battery pack, and controlling the second battery pack to independently supply power for the high-voltage loop; and driving a cooling system to cool the first battery pack by utilizing the electric energy provided by the second battery pack. In the technical scheme, when the first battery pack is out of control, the first battery pack is electrically isolated from the high-voltage loop, so that the whole system can be prevented from being influenced by fault expansion to a certain extent. By switching the connection mode of the first battery pack and the second battery pack, the second battery pack is independently powered, and the equipment can be ensured to still continuously operate. Meanwhile, the electric energy provided by the second battery pack is used for driving the cooling system to cool the first battery pack, so that the problem of insufficient power supply of the low-voltage storage battery can be avoided, heat diffusion is effectively restrained, and the safety of equipment is improved. In some possible embodiments, the driving the cooling system to cool the first battery pack using the electric energy provided by the second battery pack includes: supplying power to a high-voltage compression component of the cooling system by utilizing the electric energy output by the second battery pack; The temperature of the cooling water is reduced by the high-pressure cooling part to cool the first battery pack. In the technical scheme, the high-voltage power can be utilized to directly drive the high-voltage compression part to refrigerate, so that the cooling capacity of the cooling system is improved. In some possible embodiments, the driving the cooling system to cool the first battery pack using the electric energy provided by the second battery pack includes: Converting the voltage output by the second battery pack into a first target voltage by using a voltage conversion module; providing the first target voltage to a water pump of the cooling system; and driving cooling water circulation by using the water pump so as to cool the first battery pack. In the technical scheme, the operation of the water pump can be maintained for a long time, and the risk of cooling interruption caused by the exhaustion of the electric quantity of the low-voltage storage battery is avoided, so that the heat diffusion is continuously restrained. In addition, because the low-voltage storage battery is not required to be relied on for supplying power, the type selection configuration of the low-voltage storage battery can be optimized while the cooling effect is ensured, and the system cost is reduced. In some possible embodiments, the driving the cooling system to cool the first battery pack using the electric energy provided by the second battery pack includes: Converting the voltage output by the second battery pack into a second target voltage by using a voltage conversion module; Providing the second target voltage to an actuator of a three-way valve of the cooling system; And adjusting the flow rate of cooling water flowing through the first battery pack by controlling the opening degree of the three-way valve so as to cool the first battery pack. In the above technical solution, the control of the actuator of the three-way valve can be maintained for a long time, and the first battery pack is cooled. In addition, because the low-voltage storage battery