Liquid cooling device

Abstract

This invention discloses a liquid cooling device, belonging to the field of charging pile heat dissipation. The liquid cooling device includes multiple cooling tanks, controllable valves, vent valves, a cooling pump, fluid pipelines, an air-cooling device, a temperature sensor (PT), and a data processing device. The liquid cooling device is located in one of the cooling tanks, which stores coolant. The cooling pump draws coolant from the cooling tanks. The controllable valves control the flow rate of coolant entering the liquid cooling device. The vent valves control the airflow through the vents of the air-cooling device. The liquid cooling device delivers coolant to multiple heat-conducting plates within the charging pile. The air-cooling device dissipates heat from the heat-conducting plates at low temperature thresholds. The temperature sensor (PT) and data processing device detect and analyze the temperature values ​​at various points within the charging pile. This device enables efficient heat dissipation by combining liquid and air cooling through temperature detection.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation in charging piles, and more specifically, to a liquid cooling device. Background Technology

[0002] Most current high-power DC charging stations on the market are 250A, which is insufficient for fast charging. While pursuing high-power charging, heat dissipation must be a primary consideration. Common cooling systems include air cooling, liquid cooling, and natural cooling. However, due to cost considerations, most high-power DC charging stations do not include liquid cooling systems. Furthermore, the liquid cooling system layout of some high-power DC charging stations with liquid cooling systems is difficult, requiring additional fan exhaust vents and reducing the overall protection level of the unit. Therefore, improvements are needed. Moreover, the existing liquid cooling systems have limited compatibility with air cooling systems, resulting in poor overall heat dissipation efficiency of the charging station, which can lead to irreversible damage under overload. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a liquid cooling device that can achieve efficient heat dissipation by combining liquid cooling with air cooling through temperature detection.

[0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] A liquid cooling device includes multiple cooling tanks, controllable valves, vent valves, a cooling pump, fluid pipelines, an air-cooling device, a temperature sensor (PT), and a data processing device. The multiple cooling tanks are interconnected via multiple fluid pipelines. The liquid cooling device is located within one of the cooling tanks, and this cooling tank is used to store coolant. The cooling pump draws coolant from the cooling tanks and leads it to the controllable valves. The controllable valves control the flow rate of coolant entering the liquid cooling device. The vent valves control the airflow through the vents of the air-cooling device. The liquid cooling device delivers coolant to multiple heat-conducting plates within a charging pile for heat dissipation. The air-cooling device... The system is used to dissipate heat from the heat-conducting plate at low temperature thresholds. The temperature sensor PT and data processing device are used to detect and analyze the temperature values ​​at various locations within the charging pile, and to control the opening degree of the air vent valve and the controllable valve through three set temperature thresholds T1, T2, and T3. When the temperature is at the first temperature threshold T1, the air vent valve is open, and the air cooling device is activated to dissipate heat from the heat-conducting plate. When the temperature is at the second temperature threshold T2, the controllable valve is opened to 60%, and the liquid cooling device is activated to dissipate heat from the heat-conducting plate. When the temperature is at the third temperature threshold T3, the controllable valve is fully open, and both the liquid cooling device and the air cooling device are activated simultaneously to dissipate heat from the heat-conducting plate.

[0006] Furthermore, the cooling tank includes a first cooling tank, a second cooling tank, a third cooling tank, and a fourth cooling tank; the first cooling tank is located in the middle of the inner cavity, and a first heat exchange box and a second heat exchange box are respectively provided on both sides of the first cooling tank; the heat exchange box is used to cool the coolant flowing out from the liquid cooling device, and after cooling, it flows back into the liquid cooling device; a regulating box is provided at the lower end of the first cooling tank.

[0007] Furthermore, the second cooling tank is located at the upper end of the control box; an auxiliary box is provided inside the second cooling tank, and the auxiliary box is fixedly connected to the inner side wall of the second cooling tank. An air-cooling device is provided inside the auxiliary box; a heat-conducting plate is provided at the lower end of the air-cooling device, and the output direction of the air-cooling device is towards the heat-conducting plate; air vent valves are also provided on both sides of the second cooling tank.

[0008] Furthermore, the third cooling tank is located above the second cooling tank, and a power conversion box is installed inside the third cooling tank. The power conversion box is wrapped with coolant, and the coolant fills the third cooling tank.

[0009] Furthermore, the fourth cooling tank is located above the third cooling tank, and the controllable valve and cooling pump are placed inside the third cooling tank.

[0010] Furthermore, the insulation voltage of the coolant is up to 35kV.

[0011] Furthermore, the temperature sensor PT is electrically connected to an external data processing device so that each temperature sensor PT collects 20 data points within 1 second, and the 20 data points are first processed for anti-shake before calculation to obtain the temperature of that part.

[0012] Furthermore, the controllable valve is electrically connected to the output of the data processing device. Subsequently, the pile cooling control outputs control information to the controllable valve through the data processing device according to different thresholds of the temperature data, so as to automatically adjust the opening degree of the controllable valve.

[0013] Furthermore, the air vent valve is electrically connected to the output of the data processing device. Subsequently, the pile cooling control outputs control information to the air vent valve through the data processing device based on different thresholds of the temperature data, so as to control the opening and closing of the air vent valve.

[0014] Furthermore, the three temperature thresholds are 30℃, 45℃ and 60℃ respectively. When the entire charging pile is set to 30℃, the air vent valve is adjusted to be fully open; at 45℃, the controllable valve is 60% open; and at 60℃, the controllable valve is fully open.

[0015] Compared with the prior art, the advantages of this invention are:

[0016] This solution replaces the external air duct circulation in existing technologies with an internal air duct circulation, thereby improving the overall IP protection level of the charging pile. Simultaneously, the liquid cooling pipes no longer need to surround the heat dissipation devices; one end connects to the heat exchanger, and the rest can be arranged within the charging pile's internal layout. The opening degree of the controllable valves can be automatically adjusted based on detected temperature data, and this adjustment is performed in real time. The air-cooling system and the liquid-cooling system work together more intelligently, improving heat dissipation efficiency, protection level, and reducing noise. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the middle cross-sectional structure of the charging pile of the present invention;

[0018] Figure 2 This is a flowchart of the modules of the present invention;

[0019] Figure 3 This is a graph showing the relationship between the temperature of the heat sink plate and the opening degree of the controllable valve in the liquid cooling system of the present invention.

[0020] Explanation of the labels in the diagram:

[0021] Charging pile 1, first cooling tank 11, dispatch box 12, first heat exchange box 13, second heat exchange box 14, second cooling tank 2, auxiliary box 21, air cooling device 22, heat conduction plate 23, fluid pipe 3, third cooling tank 4, power conversion box 41, coolant 42, fourth cooling tank 5, controllable valve 51, cooling pump 52, third heat exchange box 6. Detailed Implementation

[0022] Example 1:

[0023] Please see Figure 1-2 A liquid cooling device includes a charging pile 1, which has a cavity inside. A first cooling tank 11 is provided in the middle of the charging pile 1, and a scheduling box 12 is provided at the lower end of the first cooling tank 11, which is fixedly connected to the inner wall of the charging pile 1. A first heat exchange box 13 and a second heat exchange box 14 are respectively provided on both sides of the first cooling tank 11. The first heat exchange box 13 is fixedly connected to the inner wall of the charging pile 1; the second heat exchange box 14 is disposed opposite to the first heat exchange box 13 and is fixedly connected to the other inner wall of the charging pile 1.

[0024] The upper end of the scheduling box 12 is provided with a second cooling tank 2, which is not connected to the first cooling tank 11. An auxiliary box 21 is provided inside the second cooling tank 2, and the auxiliary box 21 is fixedly connected to the inner wall of the second cooling tank 2. The auxiliary box 21 is a cavity, and a wind-cooling device 22 is provided inside the cavity. The output direction of the wind-cooling device 22 is vertically downward. A heat-conducting plate 23 is provided at the lower end of the wind-cooling device 22 so that the output direction of the wind-cooling device 22 is directed towards the heat-conducting plate 23. Corresponding heat-conducting plates 23 are also provided on the back of the scheduling box 12, the auxiliary box 21, and the power conversion box 41 near the cooling tank. Air vents are also provided on both sides of the second cooling tank 2 to allow airflow when the wind-cooling device 22 is activated.

[0025] The heat-conducting plate 23 is connected to fluid pipes 3 at both ends. The fluid pipes 3 connect the second cooling tank 2, the first heat exchange box 13, the second heat exchange box 14, the third cooling tank 4, the fourth cooling tank 5 and the third heat exchange box 6 in parallel so that they can be interconnected.

[0026] A third cooling tank 4 is provided at the upper end of the second cooling tank 2. A power conversion box 41 is provided inside the third cooling tank 4, and the power conversion box 41 is fixedly connected to the inner side wall of the third cooling tank 4. The third cooling tank 4 is filled with coolant 42, and the insulation voltage of the coolant 42 can reach 35kV.

[0027] A fourth cooling tank 5 is provided at the upper end of the third cooling tank 4. Controllable valves 51 are respectively installed on both sides of the fourth cooling tank 5, and the controllable valves 51 control the ports of the fluid pipes 3 at both ends. A cooling pump 52 is also provided in the fourth cooling tank 5, and the cooling pump 52 is used to control the flow of fluid and the cooling direction within the fluid pipes 3.

[0028] Temperature sensors PTs corresponding to the detected temperatures are also installed around the scheduling box 12, auxiliary box 21, power conversion box 41, and first cooling tank 11. Each temperature sensor PT is electrically connected to an external data processing device, allowing each PT to collect 20 data points per second. These 20 data points are first processed to reduce jitter before calculation to obtain the temperature of that portion. The controllable valve 51 is electrically connected to the output of the data processing device. The pile cooling control then outputs control information to the controllable valve 51 through the data processing device based on different threshold values ​​of the temperature data, automatically adjusting the opening degree of the controllable valve 51. Similarly, the vent valve is electrically connected to the output of the data processing device. The pile cooling control then outputs control information to the vent valve through the data processing device based on different threshold values ​​of the temperature data, causing the vent valve to open and close. Heat within the pile flows through the fluid pipes to the heat exchange box for cooling, thus circulating in a cycle. There are three temperature thresholds: 30℃, 45℃ and 60℃. When the entire charging pile is set to 30℃, the air vent valve is adjusted to be fully open; at 45℃, the controllable valve 51 is 60% open; at 60℃, the controllable valve 51 is fully open.

[0029] Taking the power conversion box as an example, the heat loss of this part is P2 = I. 2 R, where I is the input current and R is the total resistance of the power conversion box; a temperature rise of 1℃ consumes approximately 1 calorie of heat, therefore the total heat consumption is Q = Pt; 1 calorie = 4.2 J; because the allowable temperature rise within the pile is Q / 4.2 = cmΔT (ΔT is the maximum allowable temperature rise within the system, in K, V (cm²) is the air volumetric flow rate, in m³ / s). 3 / min, 1CMM=35.3CFM); the air mass flow rate m=ρV(CMM) can be calculated; therefore, from the above calculation, the required air volume of the fan is

[0030] like Figure 3 The figure shows the relationship between the temperature of the heat sink plate of the liquid cooling system and the opening degree of the controllable valve. There are three temperature thresholds T1, T2 and T3. When the temperature data transmitted to the control board reaches T1 at a certain moment, the air outlet valve will be adjusted to be fully open by the algorithm. When the temperature data reaches the T2 threshold, the opening degree of the controllable valve 51 will reach 60%. When the temperature data reaches the T3 threshold, the opening degree of the controllable valve 51 will be fully open.

[0031] Working principle:

[0032] During operation, this device first uses temperature sensors to detect the temperature at various locations within the charging station. The numerical analysis divides the temperature into three threshold levels: 30°C, 45°C, and 60°C, each corresponding to a different degree of valve opening. When the temperature data transmitted to the control board reaches threshold T1, the algorithm adjusts the vent valve to fully open. When the temperature data reaches threshold T2, the controllable valve opening degree reaches 60%. When the temperature data reaches threshold T3, the controllable valve opening degree is fully open. When the temperature is at the first threshold, the air-cooling device activates for heat dissipation. When the temperature is at the second threshold, the liquid-cooling device activates while the air-cooling device deactivates. When the temperature is at the third threshold, both the liquid-cooling and air-cooling devices activate simultaneously to improve heat dissipation efficiency.

Claims

1. A cooling device for a charging pile with both air cooling and liquid cooling functions, characterized in that: It includes multiple cooling tanks, controllable valves (51), air outlet valves, cooling pumps (52), liquid cooling modules, air cooling devices (22), temperature sensors (PT), and data processing devices; Multiple cooling tanks are interconnected by multiple fluid pipes (3); the liquid cooling module is located in one of the cooling tanks and is used to store coolant (42). The cooling pump (52) is used to draw coolant (42) from the cooling tank and lead it to the controllable valve (51). The controllable valve (51) is used to control the flow rate of the coolant (42) entering the liquid cooling module; The air outlet valve is used to control the airflow through the air outlet of the air-cooling device; The liquid cooling module is used to deliver coolant to multiple heat-conducting plates inside the charging pile to dissipate heat from the heat-conducting plates. The air-cooling device (22) is used to dissipate heat from the heat-conducting plate at low temperature thresholds; The temperature sensor PT and the data processing device are used to detect and analyze the temperature values ​​at various locations within the charging pile, and to control the opening degree of the air vent valve and the controllable valve (51) by setting three temperature thresholds T1, T2 and T3. When the first temperature threshold T1 is reached, the air vent valve opens and the air-cooling device starts to dissipate heat from the heat-conducting plate; when the second temperature threshold T2 is reached, the controllable valve opens to 60% and the liquid cooling module starts to dissipate heat from the heat-conducting plate; when the third temperature threshold T3 is reached, the controllable valve opens completely and both the liquid cooling module and the air-cooling device start to dissipate heat from the heat-conducting plate. The cooling tank includes a first cooling tank (11), a second cooling tank (2), a third cooling tank (4), and a fourth cooling tank (5); the first cooling tank (11) is located in the middle of the inner cavity, and a first heat exchange box (13) and a second heat exchange box (14) are respectively provided on both sides of the first cooling tank (11); the heat exchange box is used to cool the coolant flowing out of the liquid cooling module, and after cooling, it flows back into the liquid cooling module; a scheduling box (12) is provided at the lower end of the first cooling tank (11). The fourth cooling tank (5) is provided with controllable valves (51) on both sides, and the controllable valves (51) control the ports of the fluid pipes (3) at both ends respectively; the fourth cooling tank (5) is also provided with a cooling pump (52), and the cooling pump (52) is used to control the direction of fluid and cooling direction in the fluid pipes (3); The second cooling tank (2) is located at the upper end of the control box (12); an auxiliary box (21) is provided inside the second cooling tank (2), the auxiliary box (21) is fixedly connected to the inner side wall of the second cooling tank (2), and an air-cooling device (22) is provided inside the auxiliary box (21); a heat-conducting plate (23) is provided at the lower end of the air-cooling device (22), and the output direction of the air-cooling device (22) is towards the heat-conducting plate (23); air vent valves are also provided on both sides of the second cooling tank (2); The third cooling tank (4) is located at the upper end of the second cooling tank (2). An energy conversion box (41) is provided inside the third cooling tank (4). The energy conversion box (41) is wrapped with coolant (42) on the outside. The coolant (42) fills the third cooling tank (4).

2. A charging pile cooling device with air cooling and liquid cooling functions according to claim 1, characterized in that: The fourth cooling tank (5) is located at the upper end of the third cooling tank (4), and the controllable valve (51) and cooling pump (52) are placed in the fourth cooling tank (5).

3. A charging pile cooling device with air cooling and liquid cooling functions according to claim 1, characterized in that: The insulation voltage of the coolant (42) is up to 35kV.

4. A charging pile cooling device with air cooling and liquid cooling functions according to claim 1, characterized in that: The temperature sensor PT is electrically connected to an external data processing device so that each temperature sensor PT collects 20 data points within 1 second, and the 20 data points are first processed for anti-shake and then calculated to obtain temperature data.

5. A charging pile cooling device with air cooling and liquid cooling functions according to claim 1, characterized in that: The controllable valve (51) is electrically connected to the output of the data processing device. Subsequently, the pile cooling control device outputs control information to the controllable valve (51) through the data processing device according to different thresholds of temperature data, so as to automatically adjust the opening degree of the controllable valve (51).

6. A charging pile cooling device with air cooling and liquid cooling functions according to claim 1, characterized in that: The air vent valve is electrically connected to the output of the data processing device. Subsequently, the pile cooling control device outputs control information to the air vent valve through the data processing device according to different thresholds of temperature data, so as to control the opening and closing of the air vent valve.

7. A charging pile cooling device with air cooling and liquid cooling functions according to claim 1, characterized in that: The three temperature thresholds are 30℃, 45℃ and 60℃ respectively. When the entire charging pile is set to 30℃, the air vent valve is adjusted to be fully open; at 45℃, the opening degree of the controllable valve (51) reaches 60%; at 60℃, the opening degree of the controllable valve (51) will be fully open.

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