CN-122008963-A - Control method and system of power supply circuit

CN122008963ACN 122008963 ACN122008963 ACN 122008963ACN-122008963-A

Abstract

The invention discloses a control method and a control system of a power supply circuit, wherein the power supply circuit comprises a switch module, a boost module and a low-voltage module in a battery pack of a vehicle, the boost module is connected with a cooling system of the vehicle, the method comprises the steps of acquiring the voltage of the low-voltage module after the high-voltage power down if the high-voltage power down operation based on uncontrolled execution of a battery Bao Re is detected, and controlling the switch module to conduct the low-voltage module and the boost module if the voltage of the low-voltage module is greater than or equal to a preset voltage threshold value so as to enable the voltage of the low-voltage module to be boosted and then supply power for the cooling system. The method is suitable for hybrid and pure electric vehicles, and can safely and reliably maintain the operation of the vehicle cooling system after the battery pack is electrified under high voltage due to thermal runaway, thereby effectively inhibiting the heat diffusion and improving the safety of the vehicle.

Inventors

WANG ZHICHAO
LIU ZHENYONG
WANG YANG
DU XIN

Assignees

岚图汽车科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260104

Claims (10)

1. A method of controlling a power supply circuit, the power supply circuit comprising a switch module, a boost module, and a low voltage module within a battery pack of a vehicle, the boost module being connected to a cooling system of the vehicle, the method comprising: If the high-voltage down operation based on the uncontrolled execution of the battery Bao Re is detected, the voltage of the low-voltage module after the high-voltage down operation is obtained; And if the voltage of the low-voltage module is greater than or equal to a preset voltage threshold, controlling the switch module to conduct the low-voltage module and the boosting module so that the voltage of the low-voltage module is boosted and then the cooling system is powered.
2. The method according to claim 1, wherein the method further comprises: and if the voltage of the low-voltage module is smaller than the preset voltage threshold value, controlling the switch module to disconnect the low-voltage module and the boost module.
3. The method of claim 1, wherein the switching module comprises a relay, an initial state of the relay being an off state; The method for controlling the switch module to conduct the low-voltage module and the boost module comprises the following steps: and controlling the relay to be closed so as to conduct the low-voltage module and the boosting module.
4. The method of claim 1, wherein the low voltage module comprises a cell, the method further comprising: and determining the preset voltage threshold according to the thermal runaway voltage critical value or the discharge cut-off voltage value of the battery cell.
5. A control device of a power supply circuit, characterized by comprising a processor and a memory, the memory storing computer program instructions executable by the processor, which processor, when executing the computer program instructions, realizes the steps of the method according to any one of claims 1 to 4.
6. A control system of a power supply circuit is characterized by comprising the power supply circuit and the control device of the power supply circuit according to claim 5, wherein the power supply circuit comprises a switch module, a boost module and a low-voltage module in a battery pack of a vehicle, the boost module is connected with a cooling system of the vehicle, and the switch module is connected with the control device of the power supply circuit.
7. The system of claim 6, wherein the number of the low voltage modules is plural, the number of the switch modules is the same as the number of the low voltage modules, the low voltage modules and the switch modules are connected in series in a one-to-one correspondence to form plural series branches, and the plural series branches are connected in parallel with each other.
8. The system of claim 7, wherein the switch module comprises a relay, a common terminal of the relay is connected to the low voltage module, a normally open terminal of the relay is connected to the boost module, and a coil terminal of the relay is connected to a control device of the power supply circuit.
9. The system of claim 7, wherein the low voltage module comprises a battery cell having a safe operating voltage range of 12 v-27 v.
10. The system of claim 7, wherein the cooling system comprises a compressor of a vehicle.

Description

Control method and system of power supply circuit Technical Field The invention relates to the technical field of safety management of power batteries of new energy automobiles, in particular to a control method and a system of a power supply circuit. Background At present, thermal runaway of a power battery is one of the great safety problems facing the field of electric automobiles. Once the power battery is out of control, the whole battery pack accumulates huge chemical energy and heat energy, so that the risk of burning and even explosion exists, and serious threat is formed to the safety of drivers, passengers and vehicle property. It is generally considered in the industry that if the uncontrolled battery core can be forcedly cooled by an external heat dissipation system in time at the initial stage of occurrence of the thermal runaway, the diffusion of the high temperature of the uncontrolled battery core to the peripheral battery core can be effectively restrained, so that the thermal runaway is delayed or even prevented. However, for the highest level of safety concerns, when a thermal runaway is detected in the battery pack, the vehicle control system must perform a "high voltage down" operation, i.e., completely shut off all high voltage loops within the vehicle, otherwise the high temperature, highly conductive materials from the runaway battery core spray will be extremely prone to shorting or arcing of the high voltage system, causing a more severe secondary electrical fire or system paralysis. However, the direct consequence of the high voltage is that the battery pack no longer outputs any electrical energy to the outside, resulting in the immediate shut down of the core cooling devices such as the vehicle air conditioning compressor, which are driven entirely by the high voltage power, and thus the ability to actively cool the battery at critical moments is lost. Therefore, how to provide a stable and reliable high-voltage power supply for the air conditioner compressor of the vehicle after the occurrence of thermal runaway so as to rapidly start forced cooling is still a pending technical problem in the current battery safety design field of pure electric and hybrid electric vehicles. Disclosure of Invention In order to safely and reliably maintain the operation of a vehicle cooling system after the battery pack is electrified under high voltage due to thermal runaway, thereby effectively inhibiting heat diffusion and improving the safety of the vehicle, the embodiment of the invention provides a control method and a control system of a power supply circuit. In a first aspect, an embodiment of the present invention provides a method for controlling a power supply circuit, where the power supply circuit includes a switch module, a boost module, and a low voltage module in a battery pack of a vehicle, where the boost module is connected to a cooling system of the vehicle, and may include: If the high-voltage down operation based on the uncontrolled execution of the battery Bao Re is detected, the voltage of the low-voltage module after the high-voltage down operation is obtained; And if the voltage of the low-voltage module is greater than or equal to a preset voltage threshold, controlling the switch module to conduct the low-voltage module and the boosting module so that the voltage of the low-voltage module is boosted and then the cooling system is powered. In one or some optional implementations of the embodiments of the application, the method further includes: and if the voltage of the low-voltage module is smaller than the preset voltage threshold value, controlling the switch module to disconnect the low-voltage module and the boost module. In one or some optional implementations of the embodiments of the present application, the switch module includes a relay, and an initial state of the relay is an off state; The method for controlling the switch module to conduct the low-voltage module and the boost module comprises the following steps: and controlling the relay to be closed so as to conduct the low-voltage module and the boosting module. In one or some optional implementations of the embodiments of the present application, the low voltage module includes a cell, and the method further includes: and determining the preset voltage threshold according to the thermal runaway voltage critical value or the discharge cut-off voltage value of the battery cell. In a second aspect, an embodiment of the present invention provides a control apparatus for a power supply circuit, including a memory, a processor, and computer program instructions stored in the memory, where the processor executes the computer program instructions to implement a control method for a power supply circuit as described above. In a third aspect, an embodiment of the present invention provides a control system of a power supply circuit, which may include the power supply circuit and a control device of the power sup