KR-20260067296-A - BATTERY COOLING SYSTEM FOR VEHICLE AND CONTROL METHOD THEREOF

KR20260067296AKR 20260067296 AKR20260067296 AKR 20260067296AKR-20260067296-A

Abstract

The present invention relates to a battery cooling system for a vehicle and a method for controlling the same. A method for controlling a battery cooling system for a vehicle may include: receiving a detected ambient temperature and obtaining a battery cooling level; determining whether a battery chiller expansion valve switching state control condition is satisfied based on the ambient temperature and the battery cooling level; determining a first operating temperature and a second operating temperature based on the set temperature of an air conditioning system when it is determined that the battery chiller expansion valve switching state control condition is satisfied; controlling the switching state of the battery chiller expansion valve according to the first operating temperature and the second operating temperature; receiving an evaporator temperature and comparing the received evaporator temperature with the determined first operating temperature; controlling the battery chiller expansion valve to an open state when it is determined that the evaporator temperature is lower than or equal to the second operating temperature; and controlling the battery chiller expansion valve to a closed state when it is determined that the evaporator temperature is higher than the second operating temperature.

Inventors

호우칭동
정태훈
짜이시아오루에이

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260512
Application Date: 20250711
Priority Date: 20241105

Claims (20)

In the vehicle battery cooling system, It includes an ambient temperature sensor, an evaporator temperature sensor, a battery chiller, a battery chiller expansion valve, and a controller, The above ambient temperature sensor is configured to detect the ambient temperature; The above evaporator temperature sensor is configured to detect the evaporator temperature of the air conditioning system; The above battery chiller is configured to cool the coolant through heat exchange between the refrigerant supplied from the air conditioning system and the coolant supplied from the battery cooling system, and to cool the battery using the cooled coolant; The above battery chiller expansion valve is provided upstream of the battery chiller and is configured to optionally introduce refrigerant into the battery chiller in an expanded state; The above controller is, Receive the ambient temperature detected from the ambient temperature sensor; Obtain battery cooling level; Determining whether the battery chiller expansion valve switching state control condition for dynamically controlling the switching state of the battery chiller expansion valve is satisfied based on the ambient temperature and battery cooling level; When it is determined that the battery chiller expansion valve switching state control condition is satisfied, a first operating temperature and a second operating temperature for controlling the operation of the battery chiller expansion valve are determined based on the set temperature of the air conditioning system received from the air conditioning system, and the switching state of the battery chiller expansion valve is controlled according to the first operating temperature and the second operating temperature, wherein the second operating temperature is lower than the first operating temperature; Receives the evaporator temperature from the evaporator temperature sensor and determines whether the evaporator temperature is lower than or equal to the second operating temperature; A battery cooling system for a vehicle configured to control the battery chiller expansion valve to an open state when it is determined that the evaporator temperature is lower than or equal to a second operating temperature, and to control the battery chiller expansion valve to a closed state when it is determined that the evaporator temperature is higher than the second operating temperature.
In paragraph 1, The above controller is, A battery cooling system for a vehicle configured to determine that a battery chiller expansion valve switching state control condition for dynamically controlling the switching state of a battery chiller expansion valve is satisfied when the ambient temperature is higher than or equal to a first predetermined temperature, and the battery cooling level is greater than or equal to a minimum battery cooling level and less than a maximum battery cooling level.
In paragraph 1, The above controller is, Determining whether the time elapsed since the battery chiller expansion valve became closed is greater than or equal to a first predetermined time; If it is determined that the time elapsed since the battery chiller expansion valve became closed is less than a first predetermined time, the evaporator temperature is received from the evaporator temperature sensor, and it is determined whether the evaporator temperature is lower than or equal to a second operating temperature; If the evaporator temperature is determined to be lower than or equal to the second operating temperature, open the battery chiller expansion valve; A battery cooling system for a vehicle configured to determine whether the time elapsed since the battery chiller expansion valve was closed again is greater than or equal to a first predetermined time when it is determined that the evaporator temperature is higher than a second operating temperature.
In paragraph 3, The above controller is, A battery cooling system for a vehicle, configured such that when it is determined that the time elapsed since the battery chiller expansion valve became closed is greater than or equal to a first predetermined time, the first operating temperature and the second operating temperature are increased by a first predetermined value to become the first increased first operating temperature and the first increased second operating temperature, respectively.
In paragraph 4, The above controller is, After increasing the first operating temperature and the second operating temperature by a first predetermined value, receive the evaporator temperature from the evaporator temperature sensor and determine whether the evaporator temperature is lower than or equal to the first increased second operating temperature; A battery cooling system for a vehicle configured to open a battery chiller expansion valve when the evaporator temperature is determined to be lower than or equal to a first increased second operating temperature.
In paragraph 5, The above controller is, If it is determined that the evaporator temperature is higher than the first increased second operating temperature, determine whether the time elapsed since adjusting the first operating temperature and the second operating temperature is greater than or equal to the second predetermined time; A battery cooling system for a vehicle configured such that if it is determined that the time elapsed since adjusting the first operating temperature and the second operating temperature is greater than or equal to the second predetermined time, the first increased operating temperature and the second increased operating temperature are increased by the second predetermined value to become the second increased first operating temperature and the second increased second operating temperature, respectively.
In paragraph 6, The above controller is, After increasing the first increased first operating temperature and the first increased second operating temperature by a second predetermined value, receive the evaporator temperature from the evaporator temperature sensor and determine whether the evaporator temperature is lower than or equal to the second increased second operating temperature; If the evaporator temperature is determined to be lower than or equal to the second increased operating temperature, the battery chiller expansion valve is opened; A battery cooling system for a vehicle configured to determine whether the time elapsed since adjusting the first increased first operating temperature and the first increased second operating temperature is greater than or equal to a second predetermined time when it is determined that the evaporator temperature is higher than the second increased second operating temperature.
In Paragraph 7, The above controller is, A battery cooling system for a vehicle configured such that if it is determined that the time elapsed since adjusting the first increased first operating temperature and the first increased second operating temperature is greater than or equal to the second predetermined time, the second increased first operating temperature and the second increased second operating temperature are increased by the second predetermined value to become the third increased first operating temperature and the third increased second operating temperature, respectively.
In paragraph 1, The above controller is, Determining whether the time elapsed since the battery chiller expansion valve became open is greater than or equal to a first predetermined time; If it is determined that the time elapsed since the battery chiller expansion valve became open is less than a first predetermined time, the evaporator temperature is received from the evaporator temperature sensor, and it is determined whether the evaporator temperature is higher than or equal to the first operating temperature; If the evaporator temperature is determined to be higher than or equal to the first operating temperature, close the battery chiller expansion valve; A battery cooling system for a vehicle configured to determine whether the time elapsed since the battery chiller expansion valve was opened again has exceeded a first predetermined time when it is determined that the evaporator temperature is lower than the first operating temperature.
In Paragraph 9, The above controller is, A battery cooling system for a vehicle, configured such that when it is determined that the time elapsed since the battery chiller expansion valve became open is greater than or equal to a first predetermined time, the first operating temperature and the second operating temperature are reduced by a first predetermined value, respectively, to a first reduced first operating temperature and a first reduced second operating temperature.
In Paragraph 10, The above controller is, After reducing the first operating temperature and the second operating temperature by a first predetermined value, receive the evaporator temperature from the evaporator temperature sensor and determine whether the evaporator temperature is higher than or equal to the first reduced operating temperature; A battery cooling system for a vehicle configured to close a battery chiller expansion valve when it is determined that the evaporator temperature is higher than or equal to a first reduced operating temperature.
In Paragraph 11, The above controller is, If it is determined that the evaporator temperature is lower than the first reduced operating temperature, determine whether the time elapsed since adjusting the first operating temperature and the second operating temperature is greater than or equal to the second predetermined time; A battery cooling system for a vehicle configured such that if it is determined that the time elapsed since adjusting the first operating temperature and the second operating temperature is greater than or equal to the second predetermined time, the first reduced first operating temperature and the first reduced second operating temperature are reduced by the second predetermined value, respectively, to the second reduced first operating temperature and the second reduced second operating temperature.
In Paragraph 12, The above controller is, After reducing the first reduced first operating temperature and the first reduced second operating temperature by a second predetermined value, receive the evaporator temperature from the evaporator temperature sensor and determine whether the evaporator temperature is higher than or equal to the second reduced first operating temperature; If the evaporator temperature is determined to be higher than or equal to the second reduced first operating temperature, close the battery chiller expansion valve; A battery cooling system for a vehicle configured to determine whether the time elapsed since adjusting the first reduced operating temperature and the first reduced second operating temperature is greater than or equal to a second predetermined time when it is determined that the evaporator temperature is lower than the second reduced first operating temperature.
In Paragraph 13, The above controller is, A battery cooling system for a vehicle configured such that if it is determined that the time elapsed since adjusting the first reduced first operating temperature and the first reduced second operating temperature is greater than or equal to the second predetermined time, the second reduced first operating temperature and the second reduced second operating temperature are reduced by the second predetermined value to become the third reduced first operating temperature and the third reduced second operating temperature, respectively.
In paragraph 1, The above controller is, While controlling the switching state of the battery chiller expansion valve according to the first operating temperature and the second operating temperature, If it is determined that the battery chiller expansion valve switching state control condition is not satisfied, stop controlling the switching state of the battery chiller expansion valve according to the first operating temperature and the second operating temperature; A battery cooling system of a vehicle configured to determine a first operating temperature and a second operating temperature according to the changed set temperature when the set temperature of the air conditioning system is changed.
In a method for controlling a vehicle's battery cooling system, A step of receiving the ambient temperature detected by an ambient temperature sensor by a controller; Step of obtaining the battery cooling level by the controller; A step of determining whether the battery chiller expansion valve switching state control condition is satisfied for dynamically controlling the switching state of the battery chiller expansion valve by the controller based on the ambient temperature and the battery cooling level; When it is determined that the battery chiller expansion valve switching state control condition is satisfied, the controller determines a first operating temperature and a second operating temperature for controlling the operation of the battery chiller expansion valve based on the set temperature of the air conditioning system received from the air conditioning system, and controls the switching state of the battery chiller expansion valve according to the first operating temperature and the second operating temperature, wherein the second operating temperature is lower than the first operating temperature; A step of receiving the evaporator temperature from an evaporator temperature sensor by a controller and determining whether the evaporator temperature is lower than or equal to a second operating temperature; If the evaporator temperature is determined to be lower than or equal to the second operating temperature, the step of controlling the battery expansion valve to an open state by the controller; and A step of controlling the battery expansion valve to a closed state by the controller when it is determined that the evaporator temperature is higher than the second operating temperature; A method for controlling a vehicle's battery cooling system, comprising
In Paragraph 16, The step of determining whether the battery chiller expansion valve switching state control condition is satisfied is, A method for controlling a battery cooling system of a vehicle, comprising the step of determining, by a controller, that a battery chiller expansion valve switching state control condition for dynamically controlling the switching state of a battery chiller expansion valve is satisfied when the ambient temperature is higher than or equal to a first predetermined temperature, and the battery cooling level is greater than or equal to a minimum battery cooling level and less than a maximum battery cooling level.
In Paragraph 16, After the battery chiller expansion valve is closed, The controller determines whether the time elapsed since the battery chiller expansion valve became closed is greater than or equal to a first predetermined time; If it is determined that the time elapsed since the battery chiller expansion valve became closed is less than a first predetermined time, the controller receives the evaporator temperature from the evaporator temperature sensor and determines whether the evaporator temperature is lower than or equal to a second operating temperature; If the evaporator temperature is determined to be lower than or equal to the second operating temperature, the battery chiller expansion valve is opened by the controller; A method for controlling a battery cooling system of a vehicle, wherein if it is determined that the evaporator temperature is higher than a second operating temperature, the controller determines whether the time elapsed since the battery chiller expansion valve was closed again is greater than or equal to a first predetermined time.
In Paragraph 18, A method for controlling a battery cooling system of a vehicle, further comprising the step of, when it is determined that the time elapsed since the battery chiller expansion valve became closed is greater than or equal to a first predetermined time, increasing the first operating temperature and the second operating temperature by a first predetermined value by a controller to each become the first increased first operating temperature and the first increased second operating temperature, respectively.
In Paragraph 19, After increasing the first operating temperature and the second operating temperature by a first predetermined value, the controller receives the evaporator temperature from the evaporator temperature sensor and determines whether the evaporator temperature is lower than or equal to the first increased second operating temperature; and If the evaporator temperature is determined to be lower than or equal to the first increased second operating temperature, the battery chiller expansion valve is opened by the controller; A method for controlling a vehicle's battery cooling system, further comprising

Description

Battery Cooling System for Vehicle and Control Method Thereof The present invention relates to a battery cooling system for a vehicle and a method for controlling the same, which can dynamically control the switching state of a battery chiller expansion valve of a battery cooling system according to the operating state of the vehicle's air conditioning system. Electric vehicles are equipped with high-voltage batteries as their power source. To maintain the temperature of the vehicle's high-voltage battery at an optimal operating temperature, the electric vehicle's battery cooling system is equipped with a battery chiller. By installing the battery chiller of the battery cooling system and the evaporator of the air conditioning system in parallel, the battery chiller cools the coolant by utilizing heat exchange between the coolant of the battery cooling system and the refrigerant supplied from the air conditioning unit, and can then use the cooled coolant to cool the high-voltage battery. To achieve this, an expansion valve is installed upstream of the battery chiller to expand the refrigerant. Recently, with the advancement of electric vehicles, the energy density and charging speed of high-voltage batteries are gradually increasing, and the demand for cooling high-voltage batteries is also rising. Due to this increased demand for cooling, the size of battery chillers is becoming larger. Under these circumstances, if the expansion valve installed upstream of the battery chiller opens, it can affect the performance of the air conditioning system. If the opening of the expansion valve is large, a large amount of refrigerant flows from the air conditioning system into the battery chiller of the battery cooling system, thereby reducing the cooling effect of the air conditioning system. If the opening of the expansion valve is small, the temperature at the outlet of the battery chiller is high, and at the same time, the temperature of the coolant at the inlet of the battery chiller is high, which reduces the battery cooling effect and causes the air conditioning system to overheat, thereby lowering the cooling efficiency. Therefore, conventional battery cooling systems and their control methods may not be able to satisfy the cooling demands of current high-voltage batteries. The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. The above-mentioned objectives and other objectives, features, and other advantages of the present invention will be more clearly understood through the detailed description combined with the drawings below. FIG. 1 is a block diagram showing a battery cooling system of a vehicle according to an exemplary embodiment of the present invention. FIG. 2 is a flowchart illustrating a control method for a battery cooling system of a vehicle according to an exemplary embodiment of the present invention. The terms “vehicle,” “of a vehicle,” or other similar terms used herein should be understood to generally include mobility vehicles such as sports utility vehicles (SUVs), buses, trucks, and various commercial vehicles including passenger cars, vessels including various boats or ships, aircraft, etc., and to include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel (fuel derived from resources other than petroleum) vehicles. Although exemplary embodiments have been described as performing an exemplary process using multiple units, it should be understood that the exemplary process may be performed by one or more modules. It should also be understood that the term “control unit” refers to a hardware device comprising memory and a processor. The memory is configured to store modules, and the processor is configured specifically to execute said modules to complete one or more processes described in more detail below. The terms used herein are merely for describing embodiments and are not intended to limit the invention. The singular forms “one,” “one,” and “above” used herein include the plural forms unless otherwise explicitly indicated in the context. Furthermore, the term “included” as used herein specifies the presence of the feature, number, step, operation, element, and/or component, but does not exclude the presence or addition of one or more other features, number, step, operation, element, component, and/or combinations thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. A battery cooling system for a vehicle and a control method thereof according to an exemplary embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a battery cooling system of a vehicle according to an exemplary em