Thermal management system of electric vehicle charging device

Abstract

A thermal management system of an electric vehicle charging device including a compressor, a condenser, a thermal expansion valve, an evaporator, and a control unit for controlling same, according to exemplary embodiments of the present invention, comprises the steps of: (compression step) compressing a refrigerant from a low-temperature and low-pressure gaseous state to a high-temperature and high-pressure gaseous state through the compressor; (condensation step) condensing the compressed refrigerant into a high-temperature and high-pressure liquid state through the condenser; and (first phase change step) phase-changing the condensed refrigerant into a mixed form of gas and liquid through the thermal expansion valve, wherein the refrigerant in the mixed form of gas and liquid can be controlled to provide a cooling effect while passing through the evaporator.

Description

Thermal management system for electric vehicle charging devices

[0001] The present invention relates to a thermal management system for an electric vehicle charging device, and more specifically, to a thermal management system for an electric vehicle charging device that provides a cooling effect as a refrigerant in the form of a mixture of liquid and gas absorbs heat and undergoes a phase change into a gas.

[0002] Since electric vehicle charging devices output high-voltage power, a system to efficiently cool the heat generated during the charging process is essential. Generally, electric vehicle cooling can be achieved through a water-cooled cooling system.

[0003] A water-cooled cooling system can achieve cooling by circulating cooling water or refrigerant through a heat source and a heat exchanger to absorb and release heat. Water-cooled systems can provide high cooling efficiency during high-output charging, and heat generation can be managed by adding cooling lines inside the charging connector and cable.

[0004] However, the water-cooled cooling system has a cooling temperature of 5 to 30° and a maximum charging power of 400KW, so there are limitations in cooling the heat generated during megawatt charging.

[0005] In contrast, a refrigerant system can provide a cooling effect by having the refrigerant absorb heat generated during the charging process. The refrigerant system can operate by compressing the refrigerant that has absorbed heat and vaporized it, condensing it into a liquid state, and then returning it to the evaporator under low pressure for circulation. The refrigerant system can control the cooling temperature down to -37°.

[0006] However, the refrigerant system also has limitations in effectively cooling the heat generated during megawatt charging that supplies more than 1000 kW of power.

[0007] One of the various objectives of the present invention is to provide a thermal management system for an electric vehicle charging device that can maximize cooling efficiency by allowing the electric vehicle charging terminal and the refrigerant to flow in direct contact.

[0008] One of the various objectives of the present invention is to provide a thermal management system for an electric vehicle charging device that can provide a cooling effect as a refrigerant in a mixed gaseous and liquid form absorbs heat and undergoes a phase change into a gaseous form.

[0009] One of the various objectives of the present invention is to provide a thermal management system for an electric vehicle charging device that can increase energy efficiency by circulating and reusing the refrigerant.

[0010] A thermal management system for an electric vehicle charging device comprising a compressor, a condenser, a thermal expansion valve, an evaporator, and a control unit for controlling the same, according to exemplary embodiments of the present invention, wherein the thermal management system comprises a step of compressing a refrigerant from a low-temperature and low-pressure gaseous state to a high-temperature and high-pressure gaseous state through the compressor (compression step), a step of condensing the compressed refrigerant into a high-temperature and high-pressure liquid state through the condenser (condensation step), and a step of changing the phase of the condensed refrigerant into a mixed gaseous and liquid form through the thermal expansion valve (first phase change step), wherein the refrigerant in the mixed gaseous and liquid form can be controlled to provide a cooling effect while passing through the evaporator.

[0011] The above evaporator may be composed of a charging cable and a charging connector.

[0012] The method further includes a step (second phase change step) of changing the phase of the refrigerant in the form of a mixture of gas and liquid into a gaseous form through the evaporator, wherein in the second phase change step, the refrigerant in the form of a mixture of gas and liquid can be controlled to provide a cooling effect as it changes phase into a gaseous form by absorbing heat generated from the charging cable and the charging connector.

[0013] The refrigerant that has undergone a phase change into the above gaseous form can be controlled to be recovered by the compressor and recirculated.

[0014] The above thermal management system further includes an oil separator into which high-temperature and high-pressure refrigerant from the compressor flows, and the oil separator can be controlled to separate the lubricating oil contained in the refrigerant flowing in from the compressor and recirculate it to the compressor, and to deliver the refrigerant from which the lubricating oil has been removed to the condenser.

[0015] The above thermal management system further includes a first pressure gauge installed between the evaporator and the compressor, wherein the first pressure gauge is controlled to measure the pressure before the low-temperature and low-pressure refrigerant recovered from the evaporator moves to the compressor, and the control unit can control the temperature or pressure of the evaporator to maintain the temperature and pressure of the refrigerant discharged from the evaporator within an appropriate range by adjusting the temperature or pressure of the evaporator when the temperature and pressure of the refrigerant recovered from the evaporator are lower or higher than a preset value.

[0016] The above thermal management system further includes a second pressure gauge installed between the condenser and the thermal expansion valve, wherein the second pressure gauge is controlled to measure the pressure before the high-temperature and high-pressure refrigerant discharged from the condenser moves to the thermal expansion valve, and the control unit can control the temperature or pressure of the condenser to maintain the temperature and pressure of the refrigerant discharged from the condenser within an appropriate range by adjusting the temperature or pressure of the condenser when the temperature and pressure of the refrigerant discharged from the condenser are lower or higher than a preset value.

[0017] A thermal management system for an electric vehicle charging device according to exemplary embodiments of the present invention comprises the steps of: compressing a refrigerant from a low-temperature and low-pressure gaseous state to a high-temperature and high-pressure gaseous state (compression step); condensing the compressed refrigerant into a high-temperature and high-pressure liquid state (condensation step); changing the condensed refrigerant into a mixed gaseous and liquid form (first phase change step); and changing the refrigerant into a mixed gaseous and liquid form to a gaseous form (second phase change step). The refrigerant can be controlled to provide a cooling effect to the electric vehicle charging device by sequentially passing through the first phase change step and the second phase change step.

[0018] The thermal management system of an electric vehicle charging device according to exemplary embodiments of the present invention can maximize cooling efficiency by allowing the electric vehicle charging terminal and the refrigerant to flow in direct contact.

[0019] A thermal management system for an electric vehicle charging device according to exemplary embodiments of the present invention can provide a cooling effect as a refrigerant in a mixed gaseous and liquid form absorbs heat and undergoes a phase change into a gaseous form.

[0020] The thermal management system of an electric vehicle charging device according to exemplary embodiments of the present invention can increase energy efficiency by circulating and reusing the refrigerant.

[0021] FIG. 1 is a flowchart illustrating a thermal management system for an electric vehicle charging device according to exemplary embodiments of the present invention.

[0022] FIG. 2 is a diagram schematically illustrating a thermal management system of an electric vehicle charging device according to exemplary embodiments of the present invention.

[0023] FIG. 3 is a drawing for specifically describing a thermal management system of an electric vehicle charging device according to exemplary embodiments of the present invention.

[0024] FIG. 4 is a drawing for illustrating a wire cable according to exemplary embodiments of the present invention.

[0025] Specific embodiments of the present invention will be described below. The following detailed description is provided to facilitate a comprehensive understanding of the methods, devices, and / or systems described herein. However, this is merely illustrative and the present invention is not limited thereto.

[0026] In describing the embodiments of the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the present invention. Furthermore, the terms described below are defined in consideration of their functions within the present invention, and these may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification. Terms used in the detailed description are intended merely to describe the embodiments of the present invention and should not be limiting in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as "include" or "comprise" are intended to refer to certain characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof other than those described.

[0027] In addition, terms such as first, second, A, B, (a), (b), etc. may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms.

[0028] FIG. 1 is a flowchart for explaining a thermal management system (1) of an electric vehicle charging device according to exemplary embodiments of the present invention, and FIG. 2 is a diagram for schematically explaining a thermal management system (1) of an electric vehicle charging device according to exemplary embodiments of the present invention.

[0029] A more detailed explanation will be provided later with reference to Fig. 3.

[0030] Referring to FIGS. 1 and 2, the thermal management system (1) of an electric vehicle charging device may include a refrigerant compression step (S1), a refrigerant condensation step (S2), a first phase change step (S3), and a second phase change step (S4).

[0031] The refrigerant compression step (S1) can compress the refrigerant from a low-temperature and low-pressure gaseous state to a high-temperature and high-pressure gaseous state. In one embodiment, the refrigerant in a low-temperature and low-pressure gaseous state introduced into the compressor (10) can be compressed through piston movement, and the pressure and temperature of the refrigerant can increase during the compression process. After confirming that the refrigerant in a high-temperature and high-pressure gaseous state is in a desirable state through a pressure sensor and a temperature sensor, the process can proceed to the refrigerant condensation step (S2).

[0032] The refrigerant condensation step (S2) can condense the compressed refrigerant into a high-temperature and high-pressure liquid state. In one embodiment, the condenser (20) can receive the refrigerant in a high-temperature and high-pressure gaseous state from the compressor (10) and condense it into a liquid. The refrigerant releases heat through heat exchange with external air or cooling water and can condense from a high-temperature gaseous state into a high-pressure liquid state. After confirming that the refrigerant in a high-temperature and high-pressure liquid state is in a desirable state through a pressure sensor and a temperature sensor, the process can proceed to the first phase change step (S3).

[0033] The first phase change step (S3) can change the phase of the condensed refrigerant into a mixed gaseous and liquid form. In one embodiment, the thermal expansion valve (30) can rapidly reduce the pressure and temperature by receiving the refrigerant condensed at high temperature and high pressure from the condenser (20) and expanding it. In this process, a portion of the refrigerant may change phases into a gaseous state and may be transformed into a wet vapor form in which liquid and gas are mixed at low temperature and low pressure.

[0034] The second phase change step (S4) can change the phase of the refrigerant, which is a mixture of gas and liquid, into a gaseous form. In one embodiment, the refrigerant in the form of wet vapor introduced from the thermal expansion valve (30) can absorb heat generated in the evaporator (40). The refrigerant in the form of wet vapor that has absorbed heat in the evaporator (40) evaporates into a gaseous form and changes phases, thereby providing a cooling effect.

[0035] At this time, the evaporator (40) may be composed of a charging cable (410) and a charging connector (420), and the charging cable (410) and the charging connector (420) may have a refrigerant flow path (415) that flows in direct contact with a power line (413) that supplies current. That is, since the refrigerant can flow in direct contact with the heat generated by supplying high-voltage current to the electric vehicle, the cooling effect can be maximized.

[0036] The first phase change step (S3) and the second phase change step (S4) can be performed sequentially. That is, phase changes can occur in the order of a liquid refrigerant in a high temperature and high pressure state, a refrigerant mixed with liquid and gas in a low temperature and low pressure state, and a gaseous refrigerant in a low temperature and low pressure state. The latent heat generated as the refrigerant undergoes two phase changes can maximize the cooling effect, and the refrigerant can be recirculated by performing the refrigerant compression step (S1) again.

[0037] FIG. 3 is a drawing for specifically explaining a thermal management system (1) of an electric vehicle charging device according to exemplary embodiments of the present invention, and FIG. 4 is a drawing for explaining a wire cable according to exemplary embodiments of the present invention.

[0038] The thermal management system (1) of an electric vehicle charging device may include a step of compressing a refrigerant from a low-temperature and low-pressure gaseous state to a high-temperature and high-pressure gaseous state through a compressor (10) (compression step (S1)), a step of condensing the compressed refrigerant into a high-temperature and high-pressure liquid state through a condenser (20) (condensation step (S2)), a step of changing the condensed refrigerant into a mixed gaseous and liquid form through a thermal expansion valve (30) (first phase change step (S3)), and a step of changing the refrigerant from a mixed gaseous and liquid form into a gaseous form through an evaporator (40) (second phase change step (S4)).

[0039] Referring to FIG. 3, the compression step (S1) is the starting point of the refrigerant circulation, and the refrigerant in a low-temperature and low-pressure gaseous state can be compressed into a high-temperature and high-pressure gaseous state through the compressor (10). Specifically, the compressor (10) can operate in the steps of refrigerant suction, refrigerant compression, and refrigerant discharge. The compressor (10) can suck in a low-temperature and low-pressure gas from the evaporator (40), which will be described later, and after increasing the pressure and temperature of the refrigerant by applying pressure through a piston inside the compressor (10), the refrigerant in a high-temperature and high-pressure gaseous state can be moved to the condenser (20). At this time, a temperature sensor can be provided to check whether the refrigerant is discharged from the compressor (10) at a desired temperature. Detailed information on how the compressor (10) receives the refrigerant from the evaporator (40) will be described later.

[0040] The compressor (10) may be a reciprocating type compressor (10) capable of piston movement, and depending on the embodiment, various types such as scroll type, rotary type, screw type, and centrifugal type compressor (10) may be used.

[0041] Meanwhile, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor (10) can be introduced into the condenser (20) via the oil separator (150). The oil separator (150) can be controlled to separate the lubricating oil contained in the refrigerant introduced from the compressor (10), recirculate it back to the compressor (10), and deliver the refrigerant from which the lubricating oil has been removed to the condenser (20).

[0042] Specifically, the oil separator (150) can first perform gravity separation where the oil, which is heavier than the refrigerant, sinks to the bottom and the refrigerant moves upward, and then centrifugally separate the separated oil and refrigerant so that the oil is pushed against the wall by rotational force and the refrigerant flows through the center. The separated refrigerant can be filtered to remove the remaining oil particles through a filter.

[0043] The separated oil can be returned to the compressor (10) for reuse, and the oil can be prevented from circulating throughout the system along with the refrigerant. A temperature sensor is provided to measure the temperature of the oil so that the oil can be circulated at an appropriate temperature, thereby maintaining the heat transfer performance of the refrigerant. Accordingly, the refrigerant in a high-purity state circulates through the system, and the heat transfer performance and energy efficiency of the refrigerant can be increased.

[0044] In the condensation stage, the condenser (20) receives the high-temperature and high-pressure gaseous refrigerant from the compressor (10) and condenses it into a high-temperature and high-pressure liquid state. The refrigerant can release heat by exchanging heat with the outside air and cooling water through the heat exchange surface of the condenser (20). To cool the released heat, the condenser (20) may be equipped with an external fan and a partition. In this process, the refrigerant can be condensed from a high-temperature gaseous state into a high-pressure liquid state, and the liquid refrigerant can be moved to the receiver (210).

[0045] The receiver (210) is a device that stores liquid refrigerant discharged from the condenser (20) and can regulate the supply of refrigerant within the system. The receiver (210) can supply an appropriate amount of refrigerant according to fluctuations in the refrigerant demand of the system. In addition, by maintaining a constant flow of refrigerant within the system and stabilizing the pressure of the refrigerant, damage to the system caused by pressure fluctuations can be prevented.

[0046] The refrigerant stored in the receiver (210) can move to the thermal expansion valve (30) via the liquid level gauge (220). The liquid level gauge (220) is a device for checking the condition of the refrigerant and can verify and check whether the refrigerant is maintained in a liquid state. In addition, the liquid level gauge (220) can visually check the flow of the refrigerant and the presence or absence of bubbles, thereby maintaining an appropriate amount of refrigerant and increasing system efficiency. Furthermore, the refrigerant stored in the receiver (210) can be managed through a temperature sensor so that it is maintained at a desirable temperature and supplied to the liquid level gauge (220).

[0047] In the first phase change step (S3), the refrigerant in a condensed state moves to the thermal expansion valve (30), and a portion of it undergoes a phase change into a gas, thereby allowing it to exist in a mixed gas and liquid state. The thermal expansion valve (30) can change the refrigerant condensed at high temperature and high pressure into a low temperature and low pressure state. Specifically, the thermal expansion valve (30) can expand the high-pressure refrigerant in a liquid state to change it into a low-pressure state. As the pressure of the refrigerant decreases, the temperature can drop rapidly, and in this process, a portion of the refrigerant changes into a gaseous state, creating a cooling effect. That is, the refrigerant can exist in a mixed liquid and gas state (wet vapor) at a low temperature and low pressure and can move to the evaporator (40).

[0048] Additionally, the thermal expansion valve (30) can regulate the flow rate of the refrigerant by detecting the temperature and pressure of the refrigerant through the sensing bulb (TXV bulb). In one embodiment, the thermal expansion valve (30) can increase the flow rate of the refrigerant when the temperature is high and decrease the flow rate of the refrigerant when the temperature is low, depending on the detected temperature change.

[0049] Meanwhile, the refrigerant in the form of a mixture of gas and liquid at low temperature and low pressure can undergo a second phase change step (S4) in which it changes into a gaseous form while passing through an evaporator (40). Inside the evaporator (40), the refrigerant can absorb surrounding heat, and the liquid refrigerant that has absorbed heat can evaporate into a gaseous state.

[0050] In one embodiment, since the refrigerant is directly circulated to the evaporator (40) through the second phase change step (S4) of the present invention, the lowest cooling temperature can be lowered to about -37℃, and the temperature of the charging cable (410) can also be maintained at room temperature.

[0051] Referring together with FIG. 4, in one embodiment, the evaporator (40) may be composed of a charging cable (410) and a charging connector (420). Specifically, the charging cable (410) may have a covered wire (411), a power line (413) for supplying power, and a refrigerant flow path (415) through which refrigerant flows. The refrigerant flow path (415) is integrated and located inside the power line (413), and the cooling efficiency can be maximized by cooling the heat generated by high-voltage current flowing through the power line (413) through direct contact with the refrigerant.

[0052] That is, in the second phase change step (S4), the refrigerant mixed with gas and liquid in a low temperature and low pressure state flows through the refrigerant flow path (415) and can provide a cooling effect by absorbing heat generated from the charging cable (410) and charging connector (420) and changing into a gaseous form. The temperature sensor can check whether the cooling system is functioning properly by measuring the temperature of the refrigerant discharged from the evaporator (40).

[0053] The cooling efficiency can be maximized through the latent heat generated as the refrigerant undergoes two phase changes, namely the first phase change stage (S3) and the second phase change stage (S4).

[0054] The refrigerant that has undergone a phase change into a gaseous form can be recovered by the compressor (10) and recirculated. At this time, before the refrigerant is recovered by the compressor (10), it may pass through a liquid separator (430). The liquid separator (430) can separate the liquid refrigerant that has not been completely converted into a gas in the evaporator (40).

[0055] Specifically, the liquid separator (430) receives refrigerant from the evaporator (40) and can collect the remaining liquid refrigerant at the bottom through methods such as gravity or collision with a wall. The liquid refrigerant separated at the bottom can be sent back to the evaporator (40) for recycling. By ensuring that only gaseous refrigerant is delivered to the compressor (10), the liquid separator (430) can prevent damage to or performance degradation of the compressor (10) and improve the efficiency of the system.

[0056] Meanwhile, a first pressure gauge (510) may be installed between the evaporator (40) and the compressor (10). The first pressure gauge (510) is a low-pressure pressure gauge and can be controlled to measure the pressure before the low-temperature and low-pressure refrigerant recovered from the evaporator (40) moves to the compressor (10). In another embodiment, the first pressure gauge (510) may be installed between the evaporator (40) and the liquid separator (430).

[0057] The first pressure gauge (510) can monitor the pressure to check whether the refrigerant in the evaporator (40) has properly absorbed heat and evaporated. A pressure value of the refrigerant that maximizes the efficiency of the system can be set as a reference value, so that the pressure is maintained close to the reference value. If the pressure is measured lower than the reference value, the cooling performance may be reduced, and if the pressure is measured higher than the reference value, the cooling process may be performed inefficiently.

[0058] In one embodiment, the control unit (50) can control the temperature or pressure of the evaporator (40) to maintain the temperature and pressure of the refrigerant discharged from the evaporator (40) within an appropriate range when the temperature and pressure of the refrigerant recovered from the evaporator (40) are lower or higher than preset values. The set values ​​for temperature and pressure may vary depending on the efficiency of the system.

[0059] Meanwhile, a second pressure gauge (520) may be installed between the condenser (20) and the thermal expansion valve (30). The second pressure gauge (520) is a high-pressure pressure gauge and can be controlled to measure the pressure before the high-temperature and high-pressure refrigerant discharged from the condenser (20) moves to the thermal expansion valve (30). Additionally, a temperature sensor capable of measuring the temperature of the refrigerant may be installed between the condenser (20) and the thermal expansion valve (30), and more preferably, it may be installed between the receiver (210) and the liquid level gauge (220).

[0060] The second pressure gauge (520) can monitor the pressure to ensure that the refrigerant in the condenser (20) properly releases heat and is converted into a liquid state. A pressure value for conversion into a high-temperature and high-pressure liquid refrigerant in the condenser (20) can be set as a reference value so that the pressure is maintained close to the reference value. If the pressure is measured lower than the reference value, the condensation efficiency of the refrigerant may decrease, and if the pressure is measured higher than the reference value, the system may be overloaded and safety issues may occur.

[0061] In one embodiment, the control unit (50) can control the temperature or pressure of the condenser (20) to maintain the temperature and pressure of the refrigerant discharged from the condenser (20) within an appropriate range when the temperature and pressure of the refrigerant discharged from the condenser (20) are lower or higher than preset values. At this time, the set values ​​of the temperature and pressure may vary depending on the efficiency of the system.

[0062] The control unit (50) can control the compressor (10), condenser (20), thermal expansion valve (30), evaporator (40), pressure sensor, and temperature sensor.

[0063] In one embodiment, the control unit (50) can control the pressure and temperature of the refrigerant discharged through the compressor (10), condenser (20), thermal expansion valve (30), and evaporator (40) to be measured. Additionally, as described above, the control unit can control the pressure, temperature, flow rate, etc. of the refrigerant by checking whether the measured pressure and temperature values ​​fall within a preset range.

[0064] As described above, the thermal management system of an electric vehicle charging device according to exemplary embodiments of the present invention can maximize cooling efficiency by allowing the electric vehicle charging terminal and the refrigerant to flow in direct contact.

[0065] Specifically, according to the thermal management system of the electric vehicle charging device of the present invention, charging efficiency can be maximized by controlling heat generation through direct cooling of the refrigerant of the charging connector and cable, and power can be provided to enable charging up to, for example, 1250KW by applying liquid evaporative phase change technology, and an efficient megawatt charging service can be implemented by shortening the time for a single charge (0~100% charge) based on a 100KWh electric vehicle battery to about 4.8 minutes.

[0066] In addition, the thermal management system of an electric vehicle charging device according to exemplary embodiments of the present invention can provide a cooling effect as a refrigerant in a mixed gaseous and liquid form absorbs heat and undergoes a phase change into a gaseous form.

[0067] In addition, the thermal management system of an electric vehicle charging device according to exemplary embodiments of the present invention can increase energy efficiency by circulating and reusing the refrigerant.

[0068] However, the concept of the present invention is not necessarily limited thereto, and the apparatus / method / system according to the exemplary embodiments of the present invention may be applied to various product / technology fields in addition to the aforementioned product / technology fields.

[0069] Although various embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. A thermal management system for an electric vehicle charging device comprising a compressor, a condenser, a thermal expansion valve, an evaporator, and a control unit for controlling the same, The above thermal management system is, A step of compressing the refrigerant from a low-temperature and low-pressure gaseous state to a high-temperature and high-pressure gaseous state through the above compressor (compression step); A step of condensing the compressed refrigerant into a high-temperature and high-pressure liquid state through the condenser (condensation step); and The method includes a step of changing the phase of the condensed refrigerant into a mixed gas and liquid form through the thermal expansion valve (first phase change step); A thermal management system for an electric vehicle charging device characterized by the fact that the above-mentioned refrigerant, in the form of a mixture of gas and liquid, is controlled to provide a cooling effect while passing through the above-mentioned evaporator.

2. In Paragraph 1, A thermal management system for an electric vehicle charging device characterized by the above-mentioned evaporator being composed of a charging cable and a charging connector.

3. In Paragraph 2, It further includes a step of changing the phase of the refrigerant, in the form of a mixture of gas and liquid, into a gaseous form through the evaporator (second phase change step); A thermal management system for an electric vehicle charging device, characterized in that, in the second phase change step, the refrigerant in the form of a mixture of gas and liquid is controlled to provide a cooling effect by absorbing heat generated from the charging cable and the charging connector and undergoing a phase change into a gaseous form.

4. In Paragraph 3, A thermal management system for an electric vehicle charging device characterized by controlling the refrigerant, which has undergone a phase change into the above gaseous form, to be recovered by the above compressor and recirculated.

5. In Paragraph 1, The above thermal management system further includes an oil separator into which high-temperature and high-pressure refrigerant from the compressor flows; A thermal management system for an electric vehicle charging device, characterized in that the above oil separator separates the lubricating oil contained in the refrigerant introduced from the compressor and recirculates it to the compressor, and controls the refrigerant from which the lubricating oil has been removed to be delivered to the condenser.

6. In Paragraph 1, The above thermal management system further includes a first pressure gauge installed between the evaporator and the compressor, and The first pressure gauge is controlled to measure the pressure before the low-temperature and low-pressure refrigerant recovered from the evaporator moves to the compressor, and A thermal management system for an electric vehicle charging device, characterized in that the above-described control unit controls the temperature or pressure of the evaporator to maintain the temperature and pressure of the refrigerant discharged from the evaporator within an appropriate range when the temperature and pressure of the refrigerant recovered from the evaporator are lower or higher than a preset value.

7. In Paragraph 1, The above thermal management system further includes a second pressure gauge installed between the condenser and the thermal expansion valve, and The second pressure gauge is controlled to measure the pressure before the high-temperature and high-pressure refrigerant discharged from the condenser moves to the thermal expansion valve, and A thermal management system for an electric vehicle charging device, characterized in that the above-described control unit controls the temperature or pressure of the condenser to maintain the temperature and pressure of the refrigerant discharged from the condenser within an appropriate range when the temperature and pressure of the refrigerant discharged from the condenser are lower or higher than a preset value.

8. A step of compressing the refrigerant from a low-temperature and low-pressure gaseous state to a high-temperature and high-pressure gaseous state (compression step); A step of condensing the above-mentioned compressed refrigerant into a high-temperature and high-pressure liquid state (condensation step); A step of changing the condensed refrigerant into a phase-changed form of a mixture of gas and liquid (first phase change step); and The method includes a step of changing the phase of the refrigerant in the form of a mixture of gas and liquid into a gaseous form (second phase change step); and A thermal management system for an electric vehicle charging device, characterized in that the above refrigerant is controlled to provide a cooling effect to the electric vehicle charging device while sequentially passing through the above first phase change step and the above second phase change step.

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