KR20240038499A - Cooling apparatus for fast charging cable and control method thereof - Google Patents

Abstract

The present invention relates to a cooling device for an electric vehicle fast charging cable and a control method thereof that can increase charging efficiency by dissipating heat by circulating cooling fluid through a cooling pipe wired within the charging cable of an electric vehicle charger.
The cooling device for electric vehicle fast charging cable of the present invention controls the operation of the pump and fan based on the measured values of the temperature sensor and pressure sensor installed on the cooling fluid circulation path, and controls the operation of the pump according to the measured value of the temperature sensor. By changing the motor rotation speed, the cooling fluid circulation speed is controlled and the risk of overheating is notified to the outside. If the measured value of the pressure sensor exceeds the preset normal pressure range, the pump motor is switched on until it enters the normal pressure range. It includes a control unit that reduces the rotation speed step by step and performs control to notify the outside of abnormal low or high pressure situations.
According to the present invention, unnecessary power consumption of the charger cooling system can be prevented by controlling the circulation speed of the cooling fluid according to the temperature and pressure of the cooling fluid.

Description

Cooling apparatus for fast charging cable and control method thereof}

The present invention relates to a cooling device for an electric vehicle fast charging cable and a control method thereof. Specifically, the present invention relates to a cooling device for an electric vehicle fast charging cable and a control method thereof. Specifically, the present invention relates to an electric vehicle fast charging system that can increase charging efficiency by dissipating heat by circulating cooling fluid through a cooling pipe wired within the charging cable of an electric vehicle charger. It relates to cable cooling devices and control methods for more efficient operation of the cooling devices.

An electric vehicle (EV) consumes electricity accumulated in a battery to rotate a motor to drive the car, and the battery needs to be charged. In order for these electric vehicles to establish a firm position against conventional internal combustion engine vehicles, rapid battery charging technology is very important.

However, in the fast charging process, a very high current must be used, which causes strong heat generation in the charging cable. In addition, this heat causes energy loss, which reduces charging efficiency and can further damage the charger and battery.

Accordingly, a cooling system must be provided to relieve heat generation, as in Korean Patent Publication No. 10-1995-0001295 (Cable and its cooling control device).

However, these cooling systems also use electricity, which incurs costs. Therefore, a cooling device and its control method that can prevent unnecessary power consumption of the charger cooling system and increase energy consumption efficiency are needed.

In addition, since the heating rate and heat generation amount of the charging cable vary depending on the type and condition of the battery, a cooling device and a control method that can control cooling more effectively are needed.

Republic of Korea Patent Publication No. 10-1993-0017048 (August 30, 1993)

In order to solve the above-described problems, the present invention provides a cooling device and a control method that can prevent unnecessary power consumption of the charger cooling system and increase energy consumption efficiency by controlling the circulation speed of the cooling fluid according to the temperature of the cooling fluid. The purpose is to provide

In addition, the aim is to provide a cooling device and a control method that can achieve maximum cooling efficiency while preventing overload of the pump that provides circulation power for the cooling fluid by controlling the circulation speed of the cooling fluid according to the pressure of the cooling fluid in the circulation path. The purpose.

In order to achieve the above-described object, a cooling device for an electric vehicle fast charging cable according to an embodiment of the present invention is a cooling device for an electric vehicle fast charging cable that circulates cooling fluid through a cooling pipe wired within the charging cable of an electric vehicle charger. A cooling fluid circulator including a cooling fluid storage tank and a pump, and circulating cooling fluid through a heat exchanger and the cooling pipe; a heat exchanger including a cooling tube and a cooling plate through which the cooling fluid flows, and cooling the cooling fluid; A fan blowing air for cooling toward the heat exchanger; A temperature sensor installed on the cooling fluid circulation path to detect the temperature of the cooling fluid; A pressure sensor installed on the cooling fluid circulation path to detect fluid pressure in the circulation path; and controlling the operation of the pump and fan by monitoring the status of the cooling device based on the measured values of the temperature sensor and the pressure sensor, and circulating the cooling fluid by changing the motor rotation speed of the pump according to the measured value of the temperature sensor. Controls the speed and notifies the outside of the risk of overheating. If the measured value of the pressure sensor exceeds the preset normal pressure range, the motor speed of the pump is gradually reduced until it enters the normal pressure range, and abnormal It is characterized by comprising a control unit that performs control to notify the outside of a low-pressure or high-pressure situation.

And when the start signal of the charger is received, the control unit starts the motor of the pump at a first rotation speed and then monitors the measured values of the temperature sensor and the pressure sensor; When the temperature measurement value of the temperature sensor exceeds the first reference temperature, the fan is started and the motor is operated at a second rotation speed higher than the first rotation speed, and then the temperature measurement value is higher than the first reference temperature. When the second reference temperature set higher is exceeded, the motor is operated at a third rotation speed higher than the second rotation speed, and the temperature measurement value is set to exceed the third reference temperature set higher than the second reference temperature. When time elapses, control is performed to notify the outside of an overheating warning; When the pressure measurement value of the pressure sensor falls below the first reference pressure and a predetermined time has elapsed, control is performed to notify the outside of a low pressure warning, and the pressure measurement value is set higher than the first reference pressure to the second reference pressure. If the pressure measurement value exceeds the second reference pressure, the motor rotation speed of the pump is gradually reduced until the pressure measurement value exceeds the third reference pressure set higher than the second reference pressure. It is characterized by performing control to notify the outside of an overpressure warning when a set time has elapsed.

In addition, when the charger completion signal is received, the control unit determines whether the measured value of the temperature sensor is below the end reference temperature. If it is below the end reference temperature, the control unit stops operation of the pump and turns on the fan after 5 to 10 seconds. It is characterized in that control is performed to stop the operation and, if the temperature is higher than the termination standard temperature, to continue operating the pump and the fan until the temperature is lower than the termination standard temperature.

In addition, a method of controlling a cooling device for an electric vehicle fast charging cable according to an embodiment of the present invention includes: (a) starting the pump motor at a first rotation speed when a charger start signal is generated; (b) determining whether the temperature measurement value of the temperature sensor that detects the cooling fluid temperature exceeds the first reference temperature; (c) when it is determined that the first reference temperature is exceeded in step (b), starting the fan and operating the motor at a second rotation speed higher than the first rotation speed; (d) determining whether the temperature measurement value after step (c) exceeds a second reference temperature set higher than the first reference temperature; (e) operating the motor at a third rotation speed higher than the second rotation speed when it is determined in step (d) that the second reference temperature is exceeded; (f) determining whether the temperature measurement value after step (e) exceeds a third reference temperature set higher than the second reference temperature; (g) If it is determined that the third reference temperature is exceeded in step (f), and the temperature measurement value still exceeds the third reference temperature after the preset time has elapsed, a charging end signal is transmitted to the charger and overheating is performed through the charger. Step of notifying the warning to the outside world; (h) determining whether the temperature measurement value of the temperature sensor is less than the end reference temperature when a charger completion signal is generated; and (i) stopping operation of the pump when it is determined that the temperature is below the end reference temperature in step (h), and stopping operation of the fan after a preset time has elapsed.

In addition, (j) after step (a), determining whether the pressure measurement value of the pressure sensor that detects the fluid pressure in the cooling fluid circulation path exceeds the first reference pressure; (k) determining whether the pressure measurement value exceeds a second reference pressure set higher than the first reference pressure when it is determined in step (j) that the first reference pressure is exceeded; (l) reducing the motor rotation speed by a preset reduction value when it is determined that the second reference pressure is exceeded in step (k); (m) determining whether the pressure measurement value after step (l) exceeds a third reference pressure set higher than the second reference pressure; (n) If it is determined that the third reference pressure is exceeded in step (m), and the pressure measurement value still exceeds the third reference pressure after the preset time has elapsed, a charging end signal is transmitted to the charger and the overpressure is transmitted through the charger. Step of notifying the warning to the outside world; and (o) when it is determined to be below the first reference pressure in step (j), if the pressure measurement value is still below the first reference pressure after a preset time has elapsed, a charging end signal is transmitted to the charger, and a low pressure pressure is transmitted through the charger. It is characterized in that it further includes a step of notifying the warning to the outside.

According to the cooling device for an electric vehicle fast charging cable and its control method of the present invention, control can be performed to increase or decrease the rotation speed of the pump motor according to the temperature change of the cooling fluid detected through a temperature sensor.

Therefore, by controlling the circulation speed of the cooling fluid according to the temperature of the cooling fluid, unnecessary power consumption of the charger cooling system is prevented and energy consumption efficiency is increased.

In addition, if high temperature persists, it detects this and transmits a charge termination signal to the charger, and controls the charger to notify the outside of an overpressure warning, thereby preventing loss of not only the cooling device but also the fast charger and electric vehicle battery linked to it. There is a remarkable effect.

Moreover, since the temperature sensor detects the temperature of the cooling fluid before being supplied to the cooling pipe of the charging cable, control for setting the circulation speed of the cooling fluid is performed before cooling the cable. In other words, the speed at which the cooling fluid stays in the cooling pipe of the cable can be controlled.

Therefore, the peak temperature rise of the cooling fluid recovered after cable cooling can be lowered, thereby reducing the temperature deviation of the circulating cooling fluid, which has the significant effect of further improving cooling performance.

In addition, in the present invention, control can be performed to reduce the rotation speed of the pump motor according to the fluid pressure in the circulation path detected through the pressure sensor.

Therefore, by controlling the circulation speed of the cooling fluid according to the pressure of the cooling fluid in the circulation path, there is a significant effect of achieving maximum cooling efficiency while preventing overload of the pump that provides the circulation power of the cooling fluid.

1 is a block diagram schematically showing the configuration of a cooling system including a cooling device for an electric vehicle fast charging cable according to a preferred embodiment of the present invention.
Figure 2 is a perspective view showing the configuration of a cooling device for an electric vehicle fast charging cable according to a preferred embodiment of the present invention.
Figure 3 is a front view showing the configuration of a cooling device for an electric vehicle fast charging cable according to a preferred embodiment of the present invention.
Figure 4 is a side view showing the configuration of a cooling device for an electric vehicle fast charging cable according to a preferred embodiment of the present invention.
Figure 5 is a cross-sectional view illustrating the structure of a supply block constituting a cooling device for an electric vehicle fast charging cable according to a preferred embodiment of the present invention.
Figure 6 is a flowchart illustrating a control method using a temperature sensor in the control method of a cooling device for a fast charging cable according to a preferred embodiment of the present invention.
Figure 7 is a flowchart illustrating a control method using a pressure sensor in the control method of a cooling device for a fast charging cable according to a preferred embodiment of the present invention.

Hereinafter, a preferred embodiment of a cooling device for an electric vehicle fast charging cable according to the present invention will be described with reference to the attached drawings.

Figure 1 is a block diagram schematically showing the configuration of a cooling system including a cooling device for an electric vehicle fast charging cable according to a preferred embodiment of the present invention, and Figures 2 to 4 are respectively a block diagram showing the configuration of a cooling system including a cooling device for an electric vehicle rapid charging cable according to a preferred embodiment of the present invention. A perspective view, front view, and side view showing the configuration of the cooling device for the charging cable.

First, the cooling device 10 for a charging cable of the present invention is connected to an electric vehicle charger and serves to cool the cable by circulating cooling fluid through the cooling pipe 170 wired within the charging cable of the charger.

Although not shown in detail in the drawing, the cooling device 10 is connected to the cooling pipe 170 of the cable through a pipe to form a circulation path that communicates as one. In addition, the cooling device 10 is electrically connected through a power line for receiving power from the charger and a circuit for exchanging signals with the charger.

Referring to Figures 1 to 4, the cooling device 10 of the present invention includes a refrigerant circulator 110 that supplies cooling fluid, a heat exchanger 120 and fan 130 that cool the cooling fluid, and a cooling device 10. It includes a temperature sensor 142, a pressure sensor 144, and a control unit 160 to detect the state of.

The refrigerant circulator 110 is for circulating cooling fluid through the cooling tube 122 of the heat exchanger 120 and the cooling pipe 170 of the charging cable, and includes a tank 112 and a pump 114.

The tank 112 stores cooling fluid. In addition, since one side of the tank 112 is provided with a fluid inlet 116 for replenishing cooling fluid, the cooling fluid can be easily replenished from the outside. Furthermore, a level sensor 117 is provided on one side of the tank 112 to detect the level of the cooling fluid stored in the tank 112.

The level sensor 117 can detect the maximum level at which the storage capacity of the tank 112 is full, a shortage level requiring replenishment, and a warning level at which operation of the pump 114 is impossible, depending on the level of the cooling fluid. .

The pump 114 induces a flow of cooling fluid by sucking the cooling fluid from the tank 112 and discharging it to the outside of the tank 112. That is, the cooling fluid moves along the circulation path by the pressure of the pump 114.

In this way, the cooling fluid discharged from the tank 112 through the pump 114 is delivered to the supply block 140 through the discharge pipe 118, and from the supply block 140 to the cooling pipe through the supply pipe 146. It is supplied as (170).

The supply block 140 is provided on one side of the tank 112.

And referring to Figure 5, a branch passage 40 is formed inside the supply block 140. The branch passage 40 includes an inlet 42 through which the cooling fluid flows from the tank 112, an outlet 44 through which the cooling fluid is discharged, a first branch port 46 where the temperature sensor 142 is installed, and a pressure It includes a second branch port 48 where the sensor 144 is installed.

Meanwhile, the cooling fluid supplied to the cooling pipe 170 cools the cable and is then returned to the recovery block 150 through the recovery pipe 152, and from the recovery block 150 through the collection pipe 154. It is transmitted to the heat exchanger (120).

The heat exchanger 120 is for cooling by dissipating heat held by the cooling fluid, and includes a cooling tube 122 through which the cooling fluid flows and a cooling plate 124 attached to the outer surface of the cooling tube. Accordingly, the cooling fluid is cooled by passing through the cooling tube 122 and transferring the retained heat to the cooling plate 124.

Here, a fan 130 is provided on one side of the heat exchanger 120 so that the heat of the heat exchanger 120 can be dissipated more quickly.

The fan 130 may be provided at least one, and as shown in FIG. 2, it is most preferable to consist of a plurality of fans 130 to blow air evenly to one front of the heat exchanger 120. .

The cooling fluid cooled while passing through the heat exchanger 120 is returned to the tank 112 through the inlet pipe 119 connected between the cooling tube 122 and the tank 112.

And in the present invention, a temperature sensor 142 and a pressure sensor 144 are disposed on the circulation path of the cooling fluid to detect the operating state of the cooling device 10 in real time.

The temperature sensor 142 is installed on the circulation path to detect the temperature of the cooling fluid, and may be installed in the first branch port 46 of the supply block 140. That is, the temperature sensor 142 can detect the temperature of the cooling fluid supplied to the cooling pipe 170 through the supply block 140.

The cooling fluid temperature measurement value detected by the temperature sensor 142 controls the operation of the pump 114 and the fan 130 in the control unit 160 and determines that an abnormality has occurred in the cooling device 10. It is used as data for

And the previously mentioned pressure sensor 144 is installed on the circulation path to detect fluid pressure.

The pressure sensor 144 may also be installed in the supply block 140 and may be installed in the second branch port 48 as described above. That is, the pressure sensor 144 can sense the cooling fluid pressure formed within the supply block 140.

The fluid pressure measurement value inside the supply block 140 detected by the pressure sensor 144 controls the operation of the pump 114 in the control unit 160 and determines that an abnormality has occurred in the cooling device 10. It is used as data for:

That is, the control unit 160 monitors the status of the cooling device 10 based on the measured values of the temperature sensor 142 and the pressure sensor 144 and controls the operation of the pump 114 and the fan 130. , if it is determined that an abnormality has occurred in the operation of the cooling device 10, control is performed to notify the outside.

First, the control unit 160 controls the cooling fluid circulation speed by changing the motor rotation speed of the pump 114 according to the measured value of the temperature sensor 142 and performs control to notify the outside of the risk of overheating.

For this purpose, first, when the start signal of the charger is received, the control unit 160 starts the motor of the pump 114 at the first rotation speed and then monitors the measured value of the temperature sensor 142 in real time.

The first rotation speed can be set in the range of 100 to 1500 RPM.

Here, the start signal of the charger is generated when payment information for charging an electric vehicle is entered into the charger, the charging connector of the charger is connected to the connection of the electric vehicle, or a charging start command for supplying power to the electric vehicle is issued from the charger. You can set it. In an embodiment of the present invention, when a charging start command is issued to the charger, a signal notifying startup is transmitted from the charger to the control unit 160 of the cooling device 10, so that the startup signal of the charger is detected.

After starting the pump 114, the pump 114 continues to operate at the first rotation speed while the temperature measurement value of the temperature sensor 142 is below the preset first reference temperature. Here, the first reference temperature can be set in the range of 15 to 35°C.

Thereafter, when the temperature measurement value of the temperature sensor 142 exceeds the first reference temperature, the control unit 160 starts the fan 130 and operates the motor of the pump 114 at a faster speed than the first rotation speed. Change to a higher second rotation speed and operate.

The second rotation speed can be set in the range of 1000 to 2500 RPM.

Therefore, as the temperature of the cooling fluid increases, the circulation speed of the cooling fluid increases by increasing the rotation speed of the motor, and naturally the cooling speed also increases. In addition, the fan 130 starts operating from the point when cooling is needed.

At this time, the pump 114 continues to operate at the second rotation speed until the temperature measurement value reaches the preset second reference temperature. Here, the second reference temperature can be set in the range of 55 to 60°C.

That is, while the first reference temperature is above the second reference temperature and below, the pump 114 continues to operate at the second rotation speed.

Subsequently, when the temperature measurement value of the temperature sensor 142 exceeds the second reference temperature, the control unit 160 changes the motor of the pump 114 to a third rotation speed higher than the second rotation speed. It operates.

The third rotation speed can be set in the range of 3000 to 4000 RPM.

And when the temperature measurement value of the temperature sensor 142 exceeds the preset third reference temperature and a predetermined time has elapsed, the control unit 160 determines that the cooling device is overheated and notifies the outside of the overheating warning. perform control. Here, the third reference temperature can be set in the range of 65 to 70°C, and the waiting time for determining overheating can be set in the range of 5 to 10 seconds.

That is, if the third reference temperature exceeding state is maintained for 5 to 10 seconds, the control unit 160 displays an overheating warning or outputs a sound through the charger.

In addition, when the measured value of the pressure sensor 144 exceeds the preset normal pressure range, the control unit 160 gradually reduces the motor rotation speed of the pump 114 until it enters the normal pressure range. and performs control to notify the outside of abnormal low or high pressure situations.

For this purpose, first, when the start signal of the charger is received, the control unit 160 starts the motor of the pump 114 at the first rotation speed and then monitors the measured value of the pressure sensor 144 in real time.

And when the pressure measurement value of the pressure sensor 144 falls below the preset first reference pressure and a predetermined time elapses, the control unit 160 determines that an abnormality has occurred in the operation of the pump 114. Control is performed to notify the outside of a low pressure warning. Here, the first reference pressure may be 1 bar, and the waiting time for determining a low pressure warning may be set in the range of 20 to 30 seconds.

That is, if the first reference pressure is below the level for 20 to 30 seconds, the control unit 160 displays a low pressure warning or outputs a sound through the charger.

And when the pressure measurement value of the pressure sensor 144 exceeds the preset second reference pressure, the control unit 160 operates the pump 114 until the pressure measurement value becomes less than the second reference pressure. Control is performed to gradually reduce the motor rotation speed. Here, the second reference pressure can be set in the range of 5 to 8 bar.

Specifically, when the pressure measurement value exceeds the second reference pressure, the control unit 160 gradually rotates the current rotation speed of the pump 114 by 10 to 20 RPM, which is set based on the measurement value of the temperature sensor 142. Control it to operate by lowering it to .

This is repeated until the pressure measurement value measured by the pressure sensor 144 becomes less than the second reference pressure. That is, the moment the pressure measurement value becomes less than the second reference pressure, the reduction in the rotational speed of the pump 114 stops, and thereafter, the pump 114 is driven at the final reduced RPM.

Here, the rotation speed reduction control of the pump 114 can be set to repeat every 10 seconds.

Nevertheless, when the pressure measurement value measured by the pressure sensor 144 exceeds the second reference pressure and exceeds the preset third reference pressure, and in this state for a predetermined time, the control unit 160 circulates the cooling fluid. It is determined that an abnormality has occurred and control is performed to notify the outside of an overpressure warning. Here, the third reference pressure can be set in the range of 10 to 12 bar, and the waiting time for high pressure warning judgment can be set in the range of 60 to 90 seconds.

That is, if the third reference pressure exceeding state is maintained for 60 to 90 seconds, the control unit 160 displays an overpressure warning or outputs a sound through the charger.

Meanwhile, the control unit 160 monitors the status of the cooling device 10 based on the measured values of the temperature sensor 142 and the pressure sensor 144 and controls the operation of the pump 114 and the fan 130. During operation, a charging completion signal may be generated from the charger at any point.

Here, the charging completion signal is generated when the charging connector of the charger is removed from the connection part of the electric vehicle, a battery full charge signal is generated from the electric vehicle connected to the charging connector of the charger, or a command to stop supplying power to the electric vehicle is issued from the charger. You can set it. Next, when a charging completion signal is received from the charger, the control unit 160 determines whether the temperature measurement value of the temperature sensor 142 is less than a preset end reference temperature. Here, the end reference temperature can be set in the range of 35 to 45°C.

If the temperature measurement value is less than the end reference temperature, the control unit 160 first stops operation of the pump 114, and stops operation of the fan 130 after 5 to 10 seconds.

In other words, when the temperature measurement value is higher than the end reference temperature, operation of the pump 114 and the fan 130 continues until the temperature falls below the end reference temperature.

Additionally, the control unit 160 notifies the cooling fluid level status of the tank 112 detected through the aforementioned level sensor 117 to the outside through the charger.

In detail, the level of the cooling fluid in the tank 112 is classified and displayed on the display of the charger or a control signal is transmitted to the charger to turn on the LED lamp. In particular, in the case of a shortage level, the need for replenishment of cooling fluid can be displayed on the display as an image or text, or an LED lamp can be turned on, and in the case of a warning level, the LED lamp can flash and an alarm or warning sound can be generated.

Hereinafter, a method of controlling a cooling device for an electric vehicle fast charging cable according to the present invention will be described with reference to the attached drawings.

Figure 6 shows a flowchart for explaining a control method using a temperature sensor in the control method of a cooling device for a fast charging cable according to a preferred embodiment of the present invention, and Figure 7 shows a flow chart explaining the control method using a pressure sensor. A flow chart for this is shown.

Referring to FIG. 6, the control method of the cooling device for the electric vehicle fast charging cable according to the present invention first includes the step of starting the pump motor at the first rotation speed (S20) when the start signal of the charger is input (S10). This starts the circulation of the cooling fluid. Here, the first rotation speed is a preset value and may be a value selected from the range of 100 to 1500 RPM.

Almost simultaneously with or after this, a step (S110) is performed to determine whether the temperature measurement value of the temperature sensor that detects the cooling fluid temperature exceeds the first reference temperature. Here, the first reference temperature is a preset value and may be a value selected from the range of 15 to 35°C.

If the temperature measurement value does not exceed the first reference temperature in step (S110), the motor of the pump repeats the step (S110) while maintaining operation at the first rotation speed so that the temperature measurement value is the first reference temperature. Continue to monitor whether the reference temperature is exceeded.

And if it is determined that the temperature measurement value exceeds the first reference temperature in the step (S110), starting the fan and operating the motor at a second rotation speed higher than the first rotation speed ( S120) is performed to accelerate the circulation speed of the cooling fluid and start additional cooling through the fan. Here, the second rotation speed is a preset value and may be a value selected from the range of 1000 to 2500 RPM.

After the step (S120), a step (S130) is performed to determine whether the temperature measurement value exceeds a second reference temperature set higher than the first reference temperature. Here, the second reference temperature is a preset value and may be a value selected from the range of 55 to 60°C.

If the temperature measurement value does not exceed the second reference temperature in step S130, the motor returns to step S110 while maintaining operation at the second rotation speed.

On the other hand, if it is determined in the step (S130) that the temperature measurement value exceeds the second reference temperature, a step (S140) of operating the motor rotation speed of the pump at a third rotation speed higher than the second rotation speed. Accelerates the circulation speed of the cooling fluid.

Here, the third rotation speed is a preset value and may be a value selected from the range of 3000 to 4000 RPM.

After the step (S140), a step (S150) is performed to determine whether the temperature measurement value exceeds a third reference temperature set higher than the second reference temperature. Here, the third reference temperature is a preset value and may be a value selected from the range of 65 to 70°C.

If the temperature measurement value does not exceed the third reference temperature in step S150, the process returns to step S130.

On the other hand, if it is determined that the temperature measurement value exceeds the third reference temperature in step (S150), it is determined whether the temperature measurement value still exceeds the third reference temperature even after the preset time (T1) has elapsed. Step S152 is performed. The preset time (T1) may be a value selected from the range of 5 to 10 seconds.

And, in step S152, if the temperature measurement value still exceeds the third reference temperature even after the preset time (T1) has elapsed, a charging end signal is transmitted to the charger, and an overheating warning is notified to the outside through the charger. A step (S160) of transmitting a control signal is performed.

On the other hand, if the temperature measurement value is below the third reference temperature after the preset time (T1) has elapsed in step (S152), the process returns to step (S150).

Meanwhile, while performing the steps (S20) to (S160), if a charge completion signal is generated from the charger (S30), a step (S40) is performed to determine whether the temperature measurement value of the temperature sensor is less than the end reference temperature. do. Here, the end reference temperature is a preset value and may be a value selected from the range of 35 to 45°C.

If the temperature measurement value is determined to be less than the end reference temperature in step (S40), operation of the pump is first stopped, and after 5 to 10 seconds, operation of the fan is stopped (S50).

On the other hand, if the temperature measurement value exceeds the end reference temperature in step (S40), the step (S40) is repeated while maintaining operation of the motor and fan to check whether the temperature measurement value falls below the end reference temperature. Continue monitoring.

Next, a control method using a pressure sensor will be described with reference to FIG. 7.

First, after the step (S20), a step (S210) is performed to determine whether the pressure measurement value of the pressure sensor that detects the fluid pressure in the cooling fluid circulation path exceeds the first reference pressure. Here, the first reference pressure is a preset value and may be 1 bar.

If it is determined in the step (S210) that the pressure measurement value exceeds the first reference pressure, a step (S220) of determining whether the pressure measurement value exceeds a second reference pressure set higher than the first reference pressure. Perform. Here, the second reference pressure is a preset value and may be a value selected from the range of 5 to 8 bar.

If the pressure measurement value does not exceed the second reference pressure in step S220, the process returns to step S210.

And, if it is determined in step S220 that the pressure measurement value exceeds the second reference pressure, a step S230 of reducing the motor rotation speed of the pump by a preset reduction value is performed. The reduction value may be a value selected from 10 to 20 RPM.

At this time, the control unit controls the current rotation speed of the motor, which is set based on the measurement value of the temperature sensor, to be gradually lowered by 10 to 20 RPM. Additionally, the speed is repeatedly decelerated by 10 to 20 RPM every 10 seconds until the pressure measurement value becomes below the second reference pressure.

After the step (S230), a step (S240) is performed to determine whether the pressure measurement value exceeds a third reference pressure set higher than the second reference pressure. Here, the third reference pressure is a preset value and may be a value selected from 10 to 12 bar.

If the pressure measurement value does not exceed the third reference pressure in step S240, the process returns to step S220. Accordingly, the step (S230) is repeatedly performed while the pressure measurement value is between the second and third reference pressures.

On the other hand, if it is determined in step S240 that the pressure measurement value exceeds the third reference pressure, it is determined whether the pressure measurement value still exceeds the third reference pressure even after the preset time (T3) has elapsed. Perform the step (S242). The preset time (T3) may be a value selected from the range of 60 to 90 seconds.

And, if the pressure measurement value still exceeds the third reference pressure even after the preset time (T3) has elapsed in step S242, a charging end signal is transmitted to the charger, and an overpressure warning is notified to the outside through the charger. Step (S250) is performed.

On the other hand, if the pressure measurement value is less than the third reference pressure after the preset time (T3) has elapsed in step (S242), the process returns to step (S220).

Meanwhile, if it is determined in step S210 that the pressure measurement value is below the first reference pressure, determining whether the pressure measurement value is still below the first reference pressure even after a preset time (T2) has elapsed ( Perform S212).

And, if the pressure measurement value still exceeds the third reference pressure even after the preset time (T2) has elapsed in the step (S212), a charging end signal is transmitted to the charger, and a low pressure warning is notified to the outside through the charger. Step (S250) is performed.

In addition, while performing steps S210 to S250, if a charge completion signal is generated from the charger (S30), a step (S40) is performed to determine whether the temperature measurement value of the temperature sensor is less than the end reference temperature. do.

And when the temperature measurement value falls below the end reference temperature, the operation of the pump is first stopped, and after 5 to 10 seconds, the operation of the fan is stopped (S50).

According to the cooling device for an electric vehicle fast charging cable and its control method of the present invention according to the above-described embodiment, the motor rotation speed of the pump 114 is increased or decreased according to the temperature change of the cooling fluid detected through the temperature sensor 142. By performing control, cooling performance can be improved while unnecessary power consumption can be prevented.

In addition, if high temperature persists, it detects this and transmits a charging termination signal to the charger, and performs control to notify the outside of the overpressure warning through the charger, thereby preventing loss of not only the cooling device but also the fast charger and electric vehicle battery linked thereto. can do.

Moreover, the temperature sensor 142 is installed in the supply block 140 and detects the temperature of the cooling fluid before being supplied from the tank 112 to the cooling pipe 170 of the charging cable, so that the heat exchanger before being supplied to the cooling pipe 170 The cooling rate at 120 is controlled. Therefore, control for setting the circulation speed of the cooling fluid can be performed at the time of supply, thereby significantly reducing the variation in the temperature of the cooling fluid supplied to the cooling pipe 170.

In addition, as the fluid pressure in the circulation path detected through the pressure sensor 144 increases, the load on the pump 114 is reduced by performing control to slow down the motor rotation speed of the pump 114 or terminate cooling and charging. It can be prevented.

Furthermore, when the fluid pressure in the circulation path detected through the pressure sensor 144 is detected to be 1 bar or less, control is performed to transmit a charging end signal to the charger and notify the outside of a low pressure warning through the charger, thereby preventing abnormalities in the circulation of the cooling fluid. This can prevent problems that lead to overheating due to continued charging while cooling is not performed properly.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these examples. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

110: refrigerant circulator 112: tank
114: pump 116: fluid inlet
117: level sensor 118: discharge pipe
119: inlet pipe 120: heat exchanger
122: cooling tube 124: cooling plate
130: fan 140: supply block
142: temperature sensor 144: pressure sensor
146: supply pipe 150: recovery block
152: collection pipe 154: collection pipe
160: Control unit 170: Cooling pipe
40: branch 42: inlet
44: outlet 46: first branch outlet
48: second branch port

Claims (5)

A cooling device for an electric vehicle fast charging cable that circulates cooling fluid through a cooling pipe wired within the charging cable of an electric vehicle charger,
A cooling fluid circulator including a cooling fluid storage tank and a pump, and circulating cooling fluid through a heat exchanger and the cooling pipe;
a heat exchanger including a cooling tube and a cooling plate through which the cooling fluid flows, and cooling the cooling fluid;
A fan blowing air for cooling toward the heat exchanger;
A temperature sensor installed on the cooling fluid circulation path to detect the temperature of the cooling fluid;
A pressure sensor installed on the cooling fluid circulation path to detect fluid pressure in the circulation path; and
The operation of the pump and fan is controlled by monitoring the status of the cooling device based on the measured values of the temperature sensor and the pressure sensor, and the cooling fluid circulation speed is controlled by changing the motor rotation speed of the pump according to the measured value of the temperature sensor. controls and notifies the outside of the risk of overheating, and if the measured value of the pressure sensor exceeds the preset normal pressure range, the motor rotation speed of the pump is gradually reduced until it enters the normal pressure range, and abnormal low pressure A cooling device for an electric vehicle fast charging cable, characterized in that it includes a control unit that performs control to notify the outside of a high pressure situation. The method of claim 1, wherein the control unit:
When a starting signal from the charger is received, the motor of the pump is started at a first rotation speed and then the measured values of the temperature sensor and the pressure sensor are monitored;
When the temperature measurement value of the temperature sensor exceeds the first reference temperature, the fan is started and the motor is operated at a second rotation speed higher than the first rotation speed, and then the temperature measurement value is higher than the first reference temperature. When the second reference temperature set higher is exceeded, the motor is operated at a third rotation speed higher than the second rotation speed, and the temperature measurement value is set to exceed the third reference temperature set higher than the second reference temperature. When time elapses, control is performed to notify the outside of an overheating warning;
When the pressure measurement value of the pressure sensor falls below the first reference pressure and a predetermined time has elapsed, control is performed to notify the outside of a low pressure warning, and the pressure measurement value is set higher than the first reference pressure to the second reference pressure. If the pressure measurement value exceeds the second reference pressure, the motor rotation speed of the pump is gradually reduced until the pressure measurement value exceeds the third reference pressure set higher than the second reference pressure. A cooling device for an electric vehicle fast charging cable that performs control to notify the outside of an overpressure warning when a set period of time has elapsed. The method of claim 2, wherein the control unit:
When the charger completion signal is received, it is determined whether the measured value of the temperature sensor is below the end standard temperature, and if it is below the end standard temperature, the operation of the pump is stopped and the fan is stopped after 5 to 10 seconds, A cooling device for an electric vehicle fast charging cable, characterized in that, when the temperature is higher than the termination reference temperature, control is performed to continue operating the pump and the fan until the temperature becomes less than the termination reference temperature. In the control method of a cooling device for an electric vehicle fast charging cable that circulates cooling fluid through a cooling pipe wired within the charging cable of an electric vehicle charger,
(a) starting the pump motor at a first rotation speed when a charger start signal is generated;
(b) determining whether the temperature measurement value of the temperature sensor that detects the cooling fluid temperature exceeds the first reference temperature;
(c) when it is determined that the first reference temperature is exceeded in step (b), starting the fan and operating the motor at a second rotation speed higher than the first rotation speed;
(d) determining whether the temperature measurement value after step (c) exceeds a second reference temperature set higher than the first reference temperature;
(e) operating the motor at a third rotation speed higher than the second rotation speed when it is determined in step (d) that the second reference temperature is exceeded;
(f) determining whether the temperature measurement value after step (e) exceeds a third reference temperature set higher than the second reference temperature;
(g) If it is determined that the third reference temperature is exceeded in step (f), and the temperature measurement value still exceeds the third reference temperature after the preset time has elapsed, a charging end signal is transmitted to the charger and overheating is performed through the charger. Step of notifying the warning to the outside world;
(h) determining whether the temperature measurement value of the temperature sensor is less than the end reference temperature when a charger completion signal is generated; and
(i) stopping operation of the pump when it is determined that the temperature is below the end reference temperature in step (h) and stopping operation of the fan after a preset time has elapsed; an electric vehicle fast charging cable comprising a. Control method of cooling device for dragon. According to claim 4,
(j) after step (a), determining whether the pressure measurement value of the pressure sensor that detects the fluid pressure in the cooling fluid circulation path exceeds the first reference pressure;
(k) determining whether the pressure measurement value exceeds a second reference pressure set higher than the first reference pressure when it is determined in step (j) that the first reference pressure is exceeded;
(l) reducing the motor rotation speed by a preset reduction value when it is determined that the second reference pressure is exceeded in step (k);
(m) determining whether the pressure measurement value after step (l) exceeds a third reference pressure set higher than the second reference pressure;
(n) If it is determined that the third reference pressure is exceeded in step (m), and the pressure measurement value still exceeds the third reference pressure after the preset time has elapsed, a charging end signal is transmitted to the charger and the overpressure is transmitted through the charger. Step of notifying the warning to the outside world; and
(o) If it is determined that the pressure is below the first reference pressure in step (j), and the pressure measurement value is still below the first reference pressure after the preset time has elapsed, a charging end signal is transmitted to the charger and a low pressure warning is sent through the charger. A method of controlling a cooling device for an electric vehicle fast charging cable, further comprising: announcing to the outside.

Images