CN-121989757-A - Battery cooling system of vehicle and control method thereof

Abstract

The invention relates to a battery cooling system of a vehicle and a control method thereof. The control method of the battery cooling system of the vehicle may include receiving a sensed ambient temperature, acquiring a battery cooling level, determining whether a battery cooler expansion valve on-off state adjustment condition is satisfied based on the ambient temperature and the battery cooling level, determining a first operation temperature and a second operation temperature based on a set temperature of an air conditioning system when the battery cooler expansion valve on-off state adjustment condition is determined to be satisfied, thereby controlling an on-off state of the battery cooler expansion valve according to the first operation temperature and the second operation temperature, receiving an evaporator temperature, comparing the received evaporator temperature with the determined first operation temperature, and placing the battery cooler expansion valve in an on state when it is determined that the evaporator temperature is lower than or equal to the second operation temperature, and placing the battery cooler expansion valve in an off state when it is determined that the evaporator temperature is higher than the second operation temperature.

Inventors

• HOU QINGDONG
• Zheng taixun
• ZHAI XIAORUI

Assignees

• 现代自动车株式会社
• 起亚株式会社

Dates

Publication Date

20260508

Application Date

20241105

Claims (20)

1. 1. A battery cooling system of a vehicle, comprising: an ambient temperature sensor for sensing an ambient temperature; an evaporator temperature sensor for sensing an evaporator temperature of the air conditioning system; A battery cooler for cooling a coolant by heat exchange between a refrigerant supplied from an air conditioning system and the coolant supplied from a battery cooling system, thereby cooling a battery with the cooled coolant; A battery cooler expansion valve disposed upstream of the battery cooler for selectively flowing the refrigerant into the battery cooler in an expanded state, and A controller configured to: receiving a sensed ambient temperature from an ambient temperature sensor; obtaining a battery cooling grade; determining whether a battery cooler expansion valve on-off state adjustment condition for dynamically controlling an on-off state of the battery cooler expansion valve is satisfied based on the ambient temperature and the battery cooling level; When it is determined that the battery cooler expansion valve on-off state adjustment condition is satisfied, determining a first operation temperature and a second operation temperature for controlling the operation of the battery cooler expansion valve based on a set temperature of the air conditioning system received from the air conditioning system, thereby controlling the on-off state of the battery cooler expansion valve according to the first operation temperature and the second operation temperature, the second operation temperature being lower than the first operation temperature; receiving an evaporator temperature from an evaporator temperature sensor, comparing the received evaporator temperature with a determined first operating temperature to determine whether the evaporator temperature is less than or equal to a second operating temperature; When the evaporator temperature is determined to be less than or equal to the second operating temperature, the battery cooler expansion valve is placed in an open state, and when the evaporator temperature is determined to be greater than the second operating temperature, the battery cooler expansion valve is placed in a closed state.
2. 2. The battery cooling system of the vehicle of claim 1, wherein the controller is configured to: When the ambient temperature is equal to or higher than a first predetermined temperature and the battery cooling level is equal to or higher than the lowest battery cooling level and is lower than the highest battery cooling level, it is determined that a battery cooler expansion valve on-off state adjustment condition for dynamically controlling the on-off state of the battery cooler expansion valve is satisfied.
3. 3. The battery cooling system of the vehicle of claim 2, wherein the controller is configured to: Determining whether an elapsed time from the battery cooler expansion valve being in the closed state exceeds a first predetermined time; receiving an evaporator temperature from an evaporator temperature sensor when it is determined that the time elapsed since the battery cooler expansion valve was placed in a closed state does not exceed a first predetermined time, comparing the received evaporator temperature with a second operating temperature to determine whether the evaporator temperature is less than or equal to the second operating temperature; when the temperature of the evaporator is determined to be lower than or equal to the second operation temperature, opening the expansion valve of the battery cooler; when it is determined that the evaporator temperature is higher than the second operating temperature, it is again determined whether the time elapsed since the battery cooler expansion valve was placed in the closed state exceeds a first predetermined time.
4. 4. The battery cooling system of the vehicle of claim 3, wherein the controller is configured to: when it is determined that the time elapsed since the battery cooler expansion valve was brought into the closed state exceeds a first predetermined time, the first operating temperature and the second operating temperature are increased by a first predetermined value as a first increased first operating temperature and a first increased second operating temperature, respectively.
5. 5. The battery cooling system of the vehicle of claim 4, wherein the controller is configured to: After increasing the first operating temperature and the second operating temperature by a first predetermined value, receiving an evaporator temperature from an evaporator temperature sensor, comparing the received evaporator temperature with the first increased second operating temperature to determine whether the evaporator temperature is less than or equal to the first increased second operating temperature; When it is determined that the evaporator temperature is less than or equal to the first increased second operating temperature, the battery cooler expansion valve is opened.
6. 6. The battery cooling system of the vehicle of claim 5, wherein the controller is configured to: Determining whether an elapsed time from the adjustment of the first operating temperature and the second operating temperature exceeds a second predetermined time when it is determined that the evaporator temperature is higher than the first increased second operating temperature; when it is determined that the time elapsed since the adjustment of the first operating temperature and the second operating temperature exceeds the second predetermined time, the first increased first operating temperature and the first increased second operating temperature are increased by a second predetermined value as the second increased first operating temperature and the second increased second operating temperature, respectively.
7. 7. The battery cooling system of the vehicle of claim 6, wherein the controller is configured to: After increasing the first increased first operating temperature and the first increased second operating temperature by a second predetermined value, receiving an evaporator temperature from an evaporator temperature sensor, comparing the received evaporator temperature with the second increased second operating temperature to determine whether the evaporator temperature is less than or equal to the second increased second operating temperature; when the evaporator temperature is determined to be less than or equal to the second increased second operating temperature, opening the battery cooler expansion valve; When it is determined that the evaporator temperature is higher than the second increased second operating temperature, it is determined whether an elapsed time from the adjustment of the first increased first operating temperature and the first increased second operating temperature exceeds a second predetermined time.
8. 8. The battery cooling system of the vehicle of claim 7, wherein the controller is configured to: When it is determined that the elapsed time from the adjustment of the first increased first operating temperature and the first increased second operating temperature exceeds the second predetermined time, the second increased first operating temperature and the second increased second operating temperature are increased by a second predetermined value as a third increased first operating temperature and a third increased second operating temperature, respectively.
9. 9. The battery cooling system of the vehicle of claim 2, wherein the controller is configured to: determining whether an elapsed time from the battery cooler expansion valve being in the open state exceeds a first predetermined time; receiving an evaporator temperature from an evaporator temperature sensor when it is determined that the time elapsed since the battery cooler expansion valve was placed in an open state does not exceed a first predetermined time, comparing the received evaporator temperature with a first operating temperature to determine whether the evaporator temperature is greater than or equal to the first operating temperature; when the temperature of the evaporator is higher than or equal to the first operation temperature, closing the expansion valve of the battery cooler; when it is determined that the evaporator temperature is lower than the first operating temperature, it is again determined whether the time elapsed since the battery cooler expansion valve was placed in the open state exceeds a first predetermined time.
10. 10. The battery cooling system of the vehicle of claim 9, wherein the controller is configured to: When it is determined that the time elapsed since the battery cooler expansion valve was placed in the open state exceeds a first predetermined time, the first operating temperature and the second operating temperature are reduced by a first predetermined value as a first reduced first operating temperature and a first reduced second operating temperature, respectively.
11. 11. The battery cooling system of the vehicle of claim 10, wherein the controller is configured to: After reducing the first operating temperature and the second operating temperature by a first predetermined value, receiving an evaporator temperature from an evaporator temperature sensor, comparing the received evaporator temperature with the first reduced first operating temperature to determine whether the evaporator temperature is greater than or equal to the first reduced first operating temperature; when it is determined that the evaporator temperature is greater than or equal to the first reduced first operating temperature, the battery cooler expansion valve is closed.
12. 12. The battery cooling system of the vehicle of claim 11, wherein the controller is configured to: Determining, when it is determined that the evaporator temperature is below the first reduced first operating temperature, whether an elapsed time from the adjustment of the first operating temperature and the second operating temperature exceeds a second predetermined time; When it is determined that the time elapsed since the adjustment of the first operating temperature and the second operating temperature exceeds the second predetermined time, the first reduced first operating temperature and the first reduced second operating temperature are reduced by a second predetermined value as the second reduced first operating temperature and the second reduced second operating temperature, respectively.
13. 13. The battery cooling system of the vehicle of claim 12, wherein the controller is configured to: Receiving an evaporator temperature from an evaporator temperature sensor after reducing the first reduced first operating temperature and the first reduced second operating temperature by a second predetermined value, comparing the received evaporator temperature with the second reduced first operating temperature to determine whether the evaporator temperature is greater than or equal to the second reduced first operating temperature; when the evaporator temperature is determined to be higher than or equal to the second reduced first operating temperature, closing the battery cooler expansion valve; when it is determined that the evaporator temperature is lower than the second reduced first operating temperature, it is determined whether the time elapsed since the adjustment of the first reduced first operating temperature and the first reduced second operating temperature exceeds a second predetermined time.
14. 14. The battery cooling system of the vehicle of claim 13, wherein the controller is configured to: when it is determined that the time elapsed since the adjustment of the first reduced first operating temperature and the first reduced second operating temperature exceeds the second predetermined time, the second reduced first operating temperature and the second reduced second operating temperature are reduced by the second predetermined value as the third reduced first operating temperature and the third reduced second operating temperature, respectively.
15. 15. The battery cooling system of the vehicle of claim 1, wherein the controller is configured to: during the control of the on-off state of the battery cooler expansion valve according to the first operating temperature and the second operating temperature: stopping controlling the opening and closing state of the expansion valve of the battery cooler according to the first operating temperature and the second operating temperature when it is determined that the adjustment condition of the opening and closing state of the expansion valve of the battery cooler is not satisfied, or When the set temperature of the air conditioning system is changed, the first operating temperature and the second operating temperature are determined according to the changed set temperature.
16. 16. A control method of a battery cooling system of a vehicle, comprising: receiving, by a controller, a sensed ambient temperature from an ambient temperature sensor; Acquiring, by a controller, a battery cooling level; determining, by the controller, whether a battery cooler expansion valve on-off state adjustment condition for dynamically controlling an on-off state of the battery cooler expansion valve is satisfied based on the ambient temperature and the battery cooling level; When it is determined that the battery cooler expansion valve on-off state adjustment condition is satisfied, determining, by the controller, a first operation temperature and a second operation temperature for controlling the operation of the battery cooler expansion valve based on a set temperature of the air conditioning system received from the air conditioning system, thereby controlling the on-off state of the battery cooler expansion valve according to the first operation temperature and the second operation temperature, the second operation temperature being lower than the first operation temperature; Receiving, by a controller, an evaporator temperature from an evaporator temperature sensor, comparing the received evaporator temperature with a determined first operating temperature to determine whether the evaporator temperature is less than or equal to a second operating temperature; when the evaporator temperature is determined to be lower than or equal to the second operating temperature, the battery cooler expansion valve is placed in an open state by the controller, and when the evaporator temperature is determined to be higher than the second operating temperature, the battery cooler expansion valve is placed in a closed state by the controller.
17. 17. The control method according to claim 16, wherein, In determining whether the battery cooler expansion valve on-off state adjustment condition is satisfied: When the ambient temperature is equal to or higher than a first predetermined temperature and the battery cooling level is equal to or higher than the lowest battery cooling level and lower than the highest battery cooling level, determining, by the controller, that a battery cooler expansion valve on-off state adjustment condition for dynamically controlling the on-off state of the battery cooler expansion valve is satisfied.
18. 18. The control method according to claim 17, wherein, After the battery cooler expansion valve is placed in a closed state: Determining, by the controller, whether an elapsed time from when the battery cooler expansion valve is in a closed state exceeds a first predetermined time; Receiving, by the controller, an evaporator temperature from the evaporator temperature sensor when it is determined that the time elapsed since the battery cooler expansion valve was placed in the closed state does not exceed a first predetermined time, comparing the received evaporator temperature with a second operating temperature to determine whether the evaporator temperature is less than or equal to the second operating temperature; When the temperature of the evaporator is determined to be lower than or equal to the second operation temperature, the controller opens the expansion valve of the battery cooler; When it is determined that the evaporator temperature is higher than the second operating temperature, it is again determined by the controller whether the time elapsed since the battery cooler expansion valve was put in the closed state exceeds the first predetermined time.
19. 19. The control method according to claim 18, further comprising: When it is determined that the time elapsed since the battery cooler expansion valve was brought into the closed state exceeds a first predetermined time, the first operating temperature and the second operating temperature are increased by a first predetermined value by the controller as a first increased first operating temperature and a first increased second operating temperature, respectively.
20. 20. The control method according to claim 19, further comprising: After increasing the first operating temperature and the second operating temperature by a first predetermined value, receiving, by the controller, an evaporator temperature from the evaporator temperature sensor, comparing the received evaporator temperature with the first increased second operating temperature to determine whether the evaporator temperature is less than or equal to the first increased second operating temperature; When it is determined that the evaporator temperature is less than or equal to the first increased second operating temperature, the battery cooler expansion valve is opened by the controller.

Description

Battery cooling system of vehicle and control method thereof Technical Field The present invention relates to a battery cooling system of a vehicle and a control method thereof, which can dynamically control a switching state of a battery cooler expansion valve of the battery cooling system according to an operation state of an air conditioning system of the vehicle. Background An electric vehicle is provided with a high-voltage battery as a power source of the vehicle. In order to bring the high-voltage battery of the vehicle to an optimum operating temperature, a battery cooling system of an electric vehicle is provided with a battery cooler (battery). The battery cooler of the battery cooling system and the evaporator of the air conditioning system are disposed in parallel so that the battery cooler can cool the coolant by heat exchange between the coolant in the battery cooling system and the refrigerant supplied from the air conditioning system, thereby cooling the high-voltage battery by the cooled coolant. For this purpose, an expansion valve for expanding the refrigerant is provided upstream of the battery cooler. In recent years, with the development of electric vehicles, the energy density and the charging speed of high-voltage batteries have been gradually increased, and the cooling demand of high-voltage batteries has also been increased. The increased cooling requirements of high voltage batteries have led to larger and larger battery coolers. In this case, once the expansion valve provided upstream of the battery cooler is opened, performance of the air conditioning system may be affected. When the opening degree of the expansion valve is large, a large amount of refrigerant flows into the battery cooler of the battery cooling system from the air conditioning system, so that the cooling effect of the air conditioning system is deteriorated, and when the opening degree of the expansion valve is small, the temperature at the outlet of the battery cooler is high, and at the same time, the temperature of the cooling liquid at the inlet of the battery cooler is high, so that the cooling effect of the battery is poor and the air conditioning system is overheated, and the cooling efficiency is reduced. Therefore, the conventional battery cooling system and the control method thereof have failed to meet the current cooling requirements of the high-voltage battery. The information contained in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. Disclosure of Invention An object of the present invention is to provide a battery cooling system of a vehicle and a control method thereof, which can solve the above-mentioned problems of the prior art. To achieve the above object, in one aspect, the present invention provides a battery cooling system of a vehicle, which may include an ambient temperature sensor for sensing an ambient temperature, an evaporator temperature sensor for sensing an evaporator temperature of an air conditioning system, a battery cooler for cooling a battery by heat exchange between a refrigerant supplied from the air conditioning system and a cooling fluid supplied from the battery cooling system to cool the battery using the cooled cooling fluid, a battery cooler expansion valve disposed upstream of the battery cooler for selectively allowing the refrigerant to flow into the battery cooler in an expanded state, and a controller configured to receive the sensed ambient temperature from the ambient temperature sensor, to acquire a battery cooling level, to determine whether a switching state adjustment condition of the battery cooler expansion valve for dynamically controlling the battery cooler expansion valve is satisfied based on the ambient temperature and the battery cooling level, to operate the first controller to receive the battery cooler expansion valve from the first temperature and the first controller to operate the expansion valve based on the first temperature when it is determined that the switching state adjustment condition of the battery cooler expansion valve is satisfied, to operate the first controller to operate the expansion valve based on the first temperature and the second controller to operate the first controller to receive the battery cooler expansion valve from the first temperature and the first temperature to operate the first controller to operate the expansion valve based on the first temperature, and when the evaporator temperature is determined to be lower than or equal to the second operation temperature, the battery cooler expansion valve is in an open state, and when the evaporator temperature is determined to be higher than the second operation temperature, the battery cooler expansion valve is in a closed state. Pr