A fast charging station cooling system coupled with vehicle battery heat dissipation

Abstract

The application relates to a fast-charging station cooling system coupled with whole-vehicle battery heat dissipation, which comprises a refrigerant loop and a cooling liquid loop; the refrigerant loop comprises a compressor, a condenser, a first throttling device and an evaporator which are sequentially connected through a refrigerant pipeline; the first throttling device and the evaporator are parallelly connected with a second throttling device and a plate heat exchanger; one side of the plate heat exchanger is a refrigerant flow channel, and the other side is a cooling liquid flow channel; the refrigerant loop and the cooling liquid loop are subjected to heat exchange through the plate heat exchanger; the cooling liquid loop comprises the plate heat exchanger, a water pump, a liquid-cooled charging cable, a liquid-cooled charging gun, a liquid-cooled charging seat and a battery module which are sequentially connected through a cooling liquid pipeline. Compared with the prior art, the fast-charging station cooling system in the application can not only maintain the temperature of the battery within the normal working range during charging, but also can fully dissipate the heat of the cable to ensure the power supply, and has high integration degree, convenience and economy.

Description

Technical Field

[0001] This invention relates to the field of fast charging technology for electric vehicles, and in particular to a cooling system for a fast charging station that couples the heat dissipation of the vehicle battery. Background Technology

[0002] Currently, with the rapid development of new energy electric vehicle technology, the number of electric vehicles on the road is constantly increasing, and users have higher and higher requirements for electric vehicle charging efficiency, making the demand for fast charging technology increasingly urgent. However, due to the constraints of two major problems—electric vehicle battery thermal management and charging cable heat dissipation—fast charging technology for electric vehicles has not yet been widely adopted.

[0003] When charging stations fast charge electric vehicle batteries, the heat generated by the battery increases exponentially compared to regular slow charging. This high-density heat accumulation accelerates battery aging, making battery cooling a major factor hindering charging speed during fast charging. Existing vehicle cooling systems, due to their limited heat dissipation capacity, cannot meet the cooling requirements of fast charging. Furthermore, charging speed is also affected and reduced when the battery temperature is too low. Simultaneously, cable heating is an unavoidable issue during high-power charging of electric vehicles. A common approach is to increase the conductor cross-sectional area to reduce heat generation, but this method makes the charging cable and charging gun bulky. Moreover, as charging time increases, if the heat inside the charging cable cannot be dissipated, it can burn out the cable and charging gun, posing safety hazards and reducing the lifespan of the charging gun.

[0004] Patent CN 106711549 A proposes a fast charging station with a cooling and heating system, including a power supply module, a charging gun, a charging gun holder, a heater, a heat exchanger, a condenser, a coolant gun, a coolant gun holder, and a housing. This system manages the battery's thermal performance during vehicle charging. However, this patent has some drawbacks. Firstly, using electric heating to heat low-temperature batteries is not economically viable. Secondly, it lacks consideration for the heat generation of the charging cables during fast charging. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art by providing a fast charging station cooling system that couples the heat dissipation of the vehicle battery. This system can maintain the battery temperature within the normal operating range during charging, and can also ensure sufficient heat dissipation of the cables to guarantee power supply. At the same time, it has a high degree of integration and is both convenient and economical.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] The purpose of this invention is to provide a fast charging station cooling system that couples the heat dissipation of the vehicle battery for cooling the battery charging line assembly. The battery charging line assembly includes a control power supply module, a liquid-cooled charging cable, a liquid-cooled charging gun, a liquid-cooled charging socket, and a battery module connected in sequence. The fast charging station cooling system includes a refrigerant loop and a coolant loop.

[0008] The refrigerant loop includes a compressor, a condenser, a first throttling device, and an evaporator connected in sequence via refrigerant piping.

[0009] The first throttling device is connected in parallel with the second throttling device and the plate heat exchanger at both ends of the evaporator;

[0010] The plate heat exchanger has a refrigerant flow channel on one side and a coolant flow channel on the other side, and the refrigerant loop and coolant loop exchange heat through the plate heat exchanger.

[0011] The coolant loop includes a plate heat exchanger, a water pump, a liquid-cooled charging cable, a liquid-cooled charging gun, a liquid-cooled charging socket, and a battery module, which are connected in sequence through coolant pipelines.

[0012] The coolant flows sequentially through the plate heat exchanger, water pump, liquid-cooled charging cable, liquid-cooled charging gun, liquid-cooled charging socket, battery module, liquid-cooled charging socket, liquid-cooled charging gun, and liquid-cooled charging cable in the coolant loop, and finally flows back into the plate heat exchanger to complete the coolant loop circulation.

[0013] Furthermore, the liquid-cooled charging cable is provided with a first coolant flow channel and a second coolant flow channel running in opposite parallel directions. The first coolant flow channel and the second coolant flow channel are respectively located on both sides of the battery charging cable assembly. By the flow of coolant in the internal channels of the liquid-cooled charging cable, the heat generated inside the cable during electric vehicle charging is absorbed and carried away, thereby ensuring the power supply of the cable and improving the charging speed of the battery.

[0014] Furthermore, the battery charging cable assembly is an integrated circuit wrapped in insulating rubber, including a DC positive terminal, a DC negative terminal, a protective ground, a battery signal, a control confirmation, a connection confirmation, and some spare lines.

[0015] Furthermore, the control power supply module can adjust the charging current and voltage according to different stages of charging to ensure that the car battery can be charged smoothly. Simultaneously, it can control the battery charging circuit to stop charging promptly in case of an error alarm, preventing accidents.

[0016] Furthermore, the liquid-cooled charging gun is provided with a first coolant interface, a second coolant interface, and a charging line interface, and the liquid-cooled charging base is provided with corresponding coolant interfaces and charging line interfaces.

[0017] When the liquid-cooled charging gun is connected to the liquid-cooled charging base, the coolant flow channel of the charging pile is connected to the coolant flow channel of the car battery to form a closed coolant loop. At the same time, the electrical energy inside the charging pile is delivered to the car battery through the charging line interface.

[0018] Furthermore, the battery module is provided with a coolant flow channel. The inlet and outlet of the coolant flow channel are connected to a first coolant interface and a second coolant interface through coolant pipes, respectively. In this way, the flow of coolant in the coolant flow channel can heat or cool the car battery to a suitable operating temperature.

[0019] Furthermore, the fast charging station cooling system also includes a temperature sensor located between the plate heat exchanger and the water pump to monitor the outlet coolant temperature of the plate heat exchanger.

[0020] Furthermore, the fast charging station cooling system also includes a controller;

[0021] The controller is communicatively connected to the second throttling device, the temperature sensor, and the water pump, respectively.

[0022] When the car is charging, the controller can communicate with the battery management system inside the car through the charging gun. The controller adjusts the operating conditions of the second throttling device, temperature sensor and water pump based on the information fed back by the battery management system.

[0023] Furthermore, the controller is a mainstream microcontroller or one of the following processor architectures: x86, ARM, or RISC-V.

[0024] Furthermore, the first throttling device and the second throttling device in this technical solution are one of a capillary tube, a throttling short tube, or an electronic expansion valve. In order to facilitate the realization of automated control, this technical solution preferably uses an electronic expansion valve.

[0025] Furthermore, when the car is charging, the liquid-cooled charging gun is inserted into the liquid-cooled charging socket. On the one hand, the charging station can deliver electrical energy to the car battery through the interconnection of the charging line interface. On the other hand, the liquid-cooled charging gun and the liquid-cooled charging socket form a coolant loop between the charging station and the car through the first coolant interface and the second coolant interface, so that the car battery and cables are all operating at a suitable temperature.

[0026] Furthermore, when a car is being charged, the charging station delivers electrical energy to the car battery in the following way: the control power supply module adjusts the charging current and voltage to first deliver the electrical energy inside the charging station system to the battery charging cable assembly inside the liquid-cooled charging cable through the battery charging line. Then, the electrical energy is delivered to the liquid-cooled charging socket through the charging line interface via the liquid-cooled charging gun. Finally, the electrical energy is delivered to the car's battery module by the battery charging line, completing the charging process of the charging station for the car battery.

[0027] The refrigerant loop working state inside the charging station cooling system is as follows: after the high temperature and high pressure refrigerant gas formed by the compressor is compressed, it is condensed into liquid by the condenser. Part of it passes through the first throttling device and absorbs heat in the evaporator to dissipate heat from the high temperature working components in the charging station. The other part passes through the second throttling device and absorbs heat from the coolant in the coolant channel in the plate heat exchanger, thereby reducing the temperature of the coolant flowing through the plate heat exchanger.

[0028] The coolant loop operates as follows: After absorbing heat in the plate heat exchanger, the low-temperature coolant flows into the first coolant channel inside the high-temperature liquid-cooled charging cable under the action of the water pump. The flow of the low-temperature coolant lowers the temperature of the high-temperature battery charging cable assembly within the liquid-cooled charging cable. The coolant then enters the liquid-cooled charging gun, and through the first coolant interface between the liquid-cooled charging gun and the liquid-cooled charging socket, the coolant enters the liquid-cooled charging socket, and then from the liquid-cooled charging socket into the battery module. The coolant flows through the coolant channels in the battery module, exchanges heat with the battery, and then flows out of the battery module. It then flows sequentially through the liquid-cooled charging socket, the second coolant interface, the liquid-cooled charging gun, and the second coolant channel of the liquid-cooled cooling cable, finally re-entering the plate heat exchanger. In the plate heat exchanger, the coolant absorbs heat and circulates again as low-temperature coolant.

[0029] Furthermore, when the car is charging, the controller adjusts the second throttling device and water pump accordingly based on the battery temperature returned by the battery management system.

[0030] Furthermore, when the battery temperature returned by the battery management system is higher than the battery's set temperature range, the water pump operates at a high speed under the control of the controller, increasing the flow rate of the coolant. The opening of the second throttling device is adjusted according to the temperature change on the temperature sensor, increasing its opening. When the system operates in this state, the coolant flowing through the plate heat exchanger can obtain more cooling energy, so that the temperature of the coolant remains low after cooling the liquid-cooled charging cable. When the coolant flows through the battery module, it can continue to absorb heat from the battery module, thus cooling the battery module until the battery module temperature drops to a suitable operating temperature.

[0031] When the battery temperature returned by the battery management system is within the set battery temperature range, the water pump operates at a medium speed under the control of the controller, and the flow rate of the coolant is appropriate. The opening of the second throttling device is adjusted according to the temperature change on the temperature sensor, so that the cold energy obtained by the coolant after flowing through the plate heat exchanger can cool the liquid-cooled charging cable. At the same time, the temperature of the coolant after cooling the liquid-cooled charging cable is close to the temperature of the battery module, so that the heat exchange between the coolant and the battery module is reduced or eliminated when the coolant flows through the battery module, thus maintaining the battery module temperature within the appropriate operating temperature.

[0032] When the battery temperature returned by the battery management system is lower than the battery's set temperature range, the water pump operates at a low speed under the control of the controller, reducing the flow rate of the coolant. The opening of the second throttling device is adjusted according to the temperature change on the temperature sensor, reducing its opening. When the system operates in this state, the coolant flowing through the plate heat exchanger receives less cold energy, causing the coolant temperature to rise after cooling the liquid-cooled charging cables. As the coolant flows through the battery module, it can heat the battery module until the battery module temperature rises to a suitable operating temperature.

[0033] The fast-charging station cooling system coupled with vehicle battery heat dissipation in this invention has the following structural features and innovations:

[0034] 1. Equipped with a plate heat exchanger: The plate heat exchanger can transfer the cold energy in the refrigerant loop to the coolant loop, thereby providing a cold source for the coolant loop.

[0035] 2. A coolant loop is provided. Through the flow of coolant in the loop, heat is transferred between the charging station, cables, and vehicle battery, thereby cooling the high-temperature cables during battery charging and controlling the battery temperature.

[0036] 3. Equipped with a liquid-cooled charging cable, by setting the battery charging line and the coolant flow channel in the same cable, the battery charging line can be quickly cooled during the vehicle charging process, which protects the circuit and improves the charging speed.

[0037] 4. The liquid-cooled charging gun and the liquid-cooled charging socket are equipped with both a coolant interface and a charging line interface. When the car is being charged, the liquid-cooled charging gun can be inserted into the liquid-cooled charging socket to both charge the car battery and control its temperature.

[0038] 5. A controller is provided to link the battery status information during vehicle charging with the internal system of the charging station, enabling each component of the charging station to respond accurately to the information returned by the battery management system, thereby achieving control of battery temperature under different scenarios.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. In this technical solution, a coolant flow path is set inside the charging station system, which can dissipate heat from the high-temperature battery during the charging process. Compared with the traditional use of on-board cooling system for heat dissipation, it can greatly reduce vehicle weight and energy consumption.

[0041] 2. In this technical solution, the amount of cold energy obtained by the coolant loop from the plate heat exchanger is controlled by adjusting the opening of the second throttling device and the flow rate of the water pump. This can achieve both cooling and heating of the battery, which can avoid the performance degradation caused by overheating during fast charging and bring the low-temperature battery to its optimal rechargeable state, thereby increasing the charging speed.

[0042] 3. In this technical solution, the battery charging cable group and the coolant flow channel are set up inside the liquid-cooled charging cable at the same time. This simplifies the circuit and utilizes the heat generated by the cable to heat the low-temperature battery, realizing energy recovery and achieving high economic benefits.

[0043] 4. The liquid-cooled charging gun in this technical solution has both battery charging and cooling functions. Compared with the separate setting of charging gun and coolant gun in the traditional solution, this method helps to reduce the area occupied by the charging gun and gun base. The connection of the cable group and coolant pipe can be completed with only one plug-in operation, which is simple to operate. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the cooling system of the fast charging station in Embodiment 1 of the present invention;

[0045] Figure 2 This is a cross-sectional interface diagram of the liquid-cooled charging gun in Embodiment 1 of the present invention;

[0046] Figure 3 This is a schematic diagram of the cooling system of the fast charging station in Embodiment 2 of the present invention;

[0047] Figure 4 This is a schematic diagram of the cross-sectional interface of the liquid-cooled charging gun in Embodiment 2 of the present invention;

[0048] In the diagram: 1-Condenser; 2-Compressor; 3-First throttling device; 4-Second throttling device; 5-Evaporator; 6-Plate heat exchanger; 7-Temperature sensor; 8-Water pump; 9-Liquid-cooled charging cable; 10-Controller; 11-Control power supply module; 12-Liquid-cooled charging gun; 13-Liquid-cooled charging socket; 14-Battery management system; 15-Battery module; 16-24 Refrigerant flow path connecting pipes; 25-29 Coolant flow path connecting pipes; 30-First coolant flow path... 31-Second coolant flow channel; 32-First coolant interface; 33-Second coolant interface; 34-Charging line interface; 35, 37-Battery charging line; 36-Battery charging cable assembly; 38-Coolant connection pipe; 39-Protective grounding wire; 40-AC live wire or DC positive wire; 41-AC neutral wire or DC negative wire; 42-Connection confirmation wire; 43-Control confirmation wire; 44-Battery signal 1 wire; 45-Battery signal 2 wire; 46-Spare wire. Detailed Implementation

[0049] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Any structural / module names, control modes, algorithms, processes, or composition ratios not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0050] Example 1

[0051] This embodiment describes a fast-charging station cooling system that couples the heat dissipation of the entire vehicle battery. Its overall structure is as follows: Figure 1 As shown, the main components include a condenser 1, a compressor 2, a first throttling device 3, a second throttling device 4, an evaporator 5, a plate heat exchanger 6, a temperature sensor 7, a water pump 8, a liquid-cooled charging cable 9, a controller 10, a control power supply module 11, a liquid-cooled charging gun 12, a liquid-cooled charging base 13, a battery management system 14, a battery module 15, refrigerant flow path connecting pipes 16-24, coolant flow path connecting pipes 25-29, a first coolant flow channel 30, a second coolant flow channel 31, a first coolant interface 32, a second coolant interface 33, a charging line interface 34, battery charging lines 35 and 37, a battery charging cable group 36, a coolant connecting pipe 38, a protective grounding wire 39, an AC live wire or DC positive wire 40, an AC neutral wire or DC negative wire 41, a connection confirmation wire 42, a control confirmation wire 43, a battery signal 1 wire 44, a battery signal 2 wire 45, and a spare wire 46.

[0052] In this embodiment, compressor 2, connecting pipe 16, condenser 1, connecting pipes 17 and 18, first throttling device 3, connecting pipe 19, and evaporator 5, connecting pipes 20 and 24 are connected in sequence to form a refrigerant loop. Simultaneously, the first throttling device 3 on this refrigerant loop is connected in parallel with a loop on the evaporator 5. This parallel loop consists of connecting pipe 21, second throttling device 4, connecting pipe 22, plate heat exchanger 6, and connecting pipe 23. One end of the parallel loop is connected to the outlet connecting pipe 17 of condenser 1 via connecting pipe 21, and the other end is connected to the suction pipe 24 of compressor 2 via connecting pipe 23.

[0053] In this embodiment, the plate heat exchanger 6, connecting pipe 25, water pump 8, connecting pipe 26, first coolant flow channel 30 inside the liquid-cooled charging cable 9, liquid-cooled charging gun 12, first coolant connection port 32, liquid-cooled charging base 13, connecting pipe 27, battery module 15, connecting pipe 28, liquid-cooled charging base 13, second coolant connection port 33, liquid-cooled charging gun 12, second coolant flow channel 31 inside the liquid-cooled charging cable 9, and connecting pipe 29 are connected sequentially to form a coolant loop. Simultaneously, a temperature sensor 7 is installed on the connecting pipe 25 between the plate heat exchanger 6 and the water pump 8 in this coolant loop.

[0054] In this embodiment, the controller 10 is electrically connected to the opening adjustment motor of the second throttling device 4, the temperature sensor 7, the motor of the water pump 8, and the battery management system 14. When the car battery is charging, the controller 10 is electrically connected to the battery management system 14 on the car through the liquid-cooled charging gun 12 and the relevant circuit in the liquid-cooled charging socket 13, so that it can interact with the battery management system 14. When the liquid-cooled charging gun 12 and the liquid-cooled charging socket 13 are not plugged in, the controller 10 and the battery management system 14 are disconnected.

[0055] This embodiment describes a fast-charging station cooling system that couples the heat dissipation of the vehicle battery. When the car is charging, the liquid-cooled charging gun 12 is inserted into the liquid-cooled charging socket 13. On the one hand, the charging station can deliver electrical energy to the car battery through the interconnection of the charging line interface 34; on the other hand, the liquid-cooled charging gun 12 and the liquid-cooled charging socket 13 form a coolant loop between the charging station and the car through the first coolant interface 32 and the second coolant interface 33, so that the car battery and cables are all operating at a suitable temperature.

[0056] The charging station delivers electrical energy to the vehicle battery in the following manner: the control power supply module 11 adjusts the charging current and voltage to first deliver the electrical energy inside the charging station system to the battery charging cable group 36 inside the liquid-cooled charging cable 9 via the battery charging line 35. Then, the electrical energy is delivered to the liquid-cooled charging socket 13 via the charging line interface 34 of the liquid-cooled charging gun 12. Finally, the electrical energy is delivered to the vehicle's battery module 15 via the battery charging line 37, thus completing the charging process of the charging station for the vehicle battery.

[0057] The refrigerant loop working state inside the charging station cooling system is as follows: After the high temperature and high pressure refrigerant gas formed by the compressor 2 is compressed, it is condensed into liquid by the condenser 1. Part of it passes through the first throttling device 3 and then absorbs heat in the evaporator 5 to dissipate heat from the high temperature working components in the charging station. The other part passes through the second throttling device 4 and then absorbs heat from the coolant in the coolant channel in the plate heat exchanger 6, thereby reducing the temperature of the coolant flowing through the plate heat exchanger 6.

[0058] The coolant loop operates as follows: After absorbing heat in the plate heat exchanger 6, the low-temperature coolant flows into the first coolant channel 30 inside the high-temperature liquid-cooled charging cable 9 under the action of the water pump 8. The flow of the low-temperature coolant in this channel lowers the temperature of the high-temperature battery charging cable assembly 36 within the liquid-cooled charging cable 9. The coolant then enters the liquid-cooled charging gun 12, and through the first coolant interface 32 between the liquid-cooled charging gun 12 and the liquid-cooled charging base 13, the coolant enters the liquid-cooled charging base 13, and then from the liquid-cooled charging base 13 into the battery module 15. The coolant flows in the coolant channel of the battery module 15, exchanges heat with the battery, and then flows out of the battery module 15. It then flows sequentially through the liquid-cooled charging base 13, the second coolant interface 33, the liquid-cooled charging gun 12, and the second coolant channel 31 of the liquid-cooled cooling cable 9, finally re-entering the plate heat exchanger 6. The coolant absorbs heat in the plate heat exchanger 6 and then circulates again as low-temperature coolant.

[0059] During vehicle charging, based on the battery temperature returned by the battery management system 14, the controller 10 performs corresponding control on the second throttling device 4 and the water pump 8, as follows:

[0060] When the battery temperature returned by the battery management system 14 is higher than the set battery temperature range, the water pump 8 operates at a high speed under the control of the controller 10, increasing the flow rate of the coolant. The opening of the second throttling device 4 is adjusted according to the temperature change on the temperature sensor 7, thus increasing the opening of the second throttling device 4. Therefore, when the system operates in this state, the coolant flowing through the plate heat exchanger 6 can obtain more cooling energy, ensuring that the coolant temperature remains low after cooling the liquid-cooled charging cable 9. As the coolant flows through the battery module 15, it can continue to absorb heat from the battery module 15, achieving cooling of the battery module 15 until its temperature drops to a suitable operating temperature.

[0061] When the battery temperature returned by the battery management system 14 is within the battery set temperature range, the water pump 8 operates at a medium speed under the control of the controller 10, and the flow rate of the coolant is appropriate. The opening of the second throttling device 4 is adjusted according to the temperature change on the temperature sensor 7, so that the cold energy obtained by the coolant after flowing through the plate heat exchanger 6 can cool the liquid-cooled charging cable 9. At the same time, the temperature of the coolant after cooling the liquid-cooled charging cable 9 is close to the temperature of the battery module 15, so that the heat exchange between the coolant and the battery module 15 is reduced or eliminated when the coolant flows through the battery module 15, and the temperature of the battery module 15 is maintained within the appropriate operating temperature.

[0062] When the battery temperature returned by the battery management system 14 is lower than the battery's set temperature range, the water pump 8 operates at a low speed under the control of the controller 10, reducing the flow rate of the coolant. The opening of the second throttling device 4 is adjusted according to the temperature change on the temperature sensor 7, thus reducing its opening. Therefore, when the system operates in this state, the coolant flowing through the plate heat exchanger 6 receives less cooling energy, causing the coolant temperature to rise after cooling the liquid-cooled charging cable 9. This allows the coolant to heat the battery module 15 as it flows through it, until the battery module 15 reaches a suitable operating temperature.

[0063] Example 2

[0064] Combination Figure 3 The second embodiment will now be described. The structures, functions, and effects in the second embodiment that are not specifically described are the same as in the first embodiment; only the differences from the embodiments described above will be explained below.

[0065] This embodiment describes a fast-charging station cooling system that couples the heat dissipation of the entire vehicle battery. Its structure is as follows: Figure 3 As shown. Compared to the first embodiment, the second embodiment mainly addresses the situation where there is no coolant flow path inside the car battery. In this embodiment, a coolant connection pipe 38 is added to the liquid-cooled charging gun 12, and the rest of the structure is the same as the first embodiment.

[0066] This embodiment describes a fast-charging station cooling system that couples the heat dissipation of the vehicle battery. When the car is charging, the liquid-cooled charging gun 12 is inserted into the liquid-cooled charging socket 13. Through the interconnection of the charging line interface 34, the charging station can deliver electrical energy to the car battery. At the same time, the first coolant interface 32 and the second coolant interface 33 on the liquid-cooled charging gun 12 are directly connected through the coolant connecting pipe 38. The internal circulation of coolant between the internal cooling system of the charging station and the liquid-cooled charging cable 9 keeps the high-temperature liquid-cooled charging cable 9 at a suitable temperature.

[0067] In this embodiment, the method by which the charging station delivers electrical energy to the vehicle battery and the working state of the refrigerant loop inside the charging station's cooling system are the same as in the first embodiment.

[0068] In this embodiment, the coolant loop operates as follows: After absorbing heat in the plate heat exchanger 6, the low-temperature coolant flows into the first coolant channel 30 inside the high-temperature liquid-cooled charging cable 9 under the action of the water pump 8. The flow of the low-temperature coolant in this channel lowers the temperature of the high-temperature battery charging cable assembly 36 inside the liquid-cooled charging cable 9. The coolant then enters the first coolant inlet 32 ​​on the liquid-cooled charging gun 12, and through the coolant connecting pipe 38, enters the second coolant inlet 33 on the liquid-cooled charging gun 12. Finally, it flows through the second coolant channel 31 inside the liquid-cooled cable 9 and re-enters the plate heat exchanger 6. The coolant absorbs heat in the plate heat exchanger 6 and then circulates again as low-temperature coolant.

[0069] During vehicle charging, based on the different coolant temperatures returned by temperature sensor 7 at the outlet of plate heat exchanger 6, controller 10 performs corresponding control on second throttling device 4 and water pump 8, as follows:

[0070] Under the control of controller 10, when the coolant temperature at the outlet of plate heat exchanger 6 returned by temperature sensor 7 is higher than the set temperature range, the water pump 8 and the second throttling device 4 are adjusted to increase the flow rate of the coolant while simultaneously increasing the opening of the second throttling device 4. When the coolant temperature at the outlet of plate heat exchanger 6 returned by temperature sensor 7 is within the set temperature range, the flow rate of water pump 8 and the opening of the second throttling device 4 are maintained. When the coolant temperature at the outlet of plate heat exchanger 6 returned by temperature sensor 7 is lower than the set temperature range, the water pump 8 and the second throttling device 4 are adjusted to decrease the flow rate of the coolant while simultaneously decreasing the opening of the second throttling device 4. This ensures that the coolant flowing through plate heat exchanger 6 can obtain the required cooling energy for the system under all operating conditions, thus ensuring that the liquid-cooled charging cable 9 is adequately cooled while minimizing unnecessary energy waste.

[0071] It should be stated that other arrangements based on the principles of this invention are also within the scope of protection of this invention. The terms "first," "second," etc., are used herein to define components. Those skilled in the art should understand that the use of these terms is merely for ease of description and to distinguish between components. Unless otherwise stated, these terms have no special meaning.

[0072] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A fast-charging station cooling system for coupling vehicle battery heat dissipation, used for cooling battery charging circuit components, wherein the battery charging circuit components include a control power supply module, a liquid-cooled charging cable, a liquid-cooled charging gun, a liquid-cooled charging socket, and a battery module connected in sequence, characterized in that, The fast charging station cooling system includes a refrigerant loop and a coolant loop; The refrigerant loop includes a compressor, a condenser, a first throttling device, and an evaporator connected in sequence via refrigerant piping. The first throttling device is connected in parallel with the second throttling device and the plate heat exchanger at both ends of the evaporator; The plate heat exchanger has a refrigerant flow channel on one side and a coolant flow channel on the other side, and the refrigerant loop and coolant loop exchange heat through the plate heat exchanger. The coolant loop includes a plate heat exchanger, a water pump, a liquid-cooled charging cable, a liquid-cooled charging gun, a liquid-cooled charging base, and a battery module, which are connected in sequence through coolant pipelines. The liquid-cooled charging cable has a first and a second coolant flow channel running in opposite parallel directions inside. The first and second coolant flow channels are respectively located on both sides of the battery charging cable assembly. By the flow of coolant in the internal channels of the liquid-cooled charging cable, the heat generated inside the cable during electric vehicle charging is absorbed and carried away, thereby ensuring the power supply of the cable and improving the charging speed of the battery. The liquid-cooled charging gun is provided with a first coolant interface, a second coolant interface and a charging line interface, and the liquid-cooled charging base is provided with corresponding coolant interfaces and charging line interfaces. When the liquid-cooled charging gun is connected to the liquid-cooled charging base, the coolant flow channel of the charging pile is connected to the coolant flow channel of the car battery to form a closed coolant loop. At the same time, the electrical energy inside the charging pile is delivered to the car battery through the charging line interface. The fast charging station cooling system also includes a temperature sensor located between the plate heat exchanger and the water pump to monitor the outlet coolant temperature of the plate heat exchanger. The fast charging station cooling system also includes a controller; The controller is communicatively connected to the second throttling device, the temperature sensor, and the water pump, respectively. When the car is charging, the controller can communicate with the battery management system inside the car through the charging gun. The controller adjusts the operating conditions of the second throttling device, temperature sensor and water pump based on the information fed back by the battery management system.

2. The fast-charging station cooling system for coupling vehicle battery heat dissipation according to claim 1, characterized in that, The battery module is equipped with a coolant flow channel. The inlet and outlet of the coolant flow channel are connected to the first coolant interface and the second coolant interface through coolant pipes, respectively. In this way, the flow of coolant in the coolant flow channel heats or cools the car battery to a suitable operating temperature.

3. The fast-charging station cooling system for coupling vehicle battery heat dissipation according to claim 1, characterized in that, When a car is being charged, the liquid-cooled charging gun is inserted into the liquid-cooled charging socket. On the one hand, the charging station can deliver electrical energy to the car battery through the interconnection of the charging line interfaces. On the other hand, the liquid-cooled charging gun and the liquid-cooled charging socket form a coolant loop between the charging station and the car through the first coolant interface and the second coolant interface, so that the car battery and cables are all operating at a suitable temperature.

4. The fast-charging station cooling system for coupling vehicle battery heat dissipation according to claim 3, characterized in that, When a car is charging, the charging station delivers electrical energy to the car battery in the following way: the control power supply module adjusts the charging current and voltage to first deliver the electrical energy from inside the charging station system to the battery charging cable assembly inside the liquid-cooled charging cable through the battery charging line. Then, the electrical energy is delivered to the liquid-cooled charging socket through the charging line interface via the liquid-cooled charging gun. Finally, the electrical energy is delivered to the car's battery module by the battery charging line, completing the charging process of the charging station for the car battery.

5. A fast-charging station cooling system for coupling vehicle battery heat dissipation according to claim 3, characterized in that, When the car is charging, the controller adjusts the second throttling device and water pump accordingly based on the battery temperature returned by the battery management system.

6. A fast-charging station cooling system for coupling vehicle battery heat dissipation according to claim 5, characterized in that, When the battery temperature returned by the battery management system is higher than the set battery temperature range, the water pump operates at a high speed under the control of the controller, increasing the flow rate of the coolant. The opening of the second throttling device is adjusted according to the temperature change on the temperature sensor, increasing its opening. When the system operates in this state, the coolant flowing through the plate heat exchanger can obtain more cooling energy, so that the temperature of the coolant remains low after cooling the liquid-cooled charging cable. When the coolant flows through the battery module, it can continue to absorb heat from the battery module, thus cooling the battery module until the battery module temperature drops to a suitable operating temperature. When the battery temperature returned by the battery management system is within the set battery temperature range, the water pump operates at a medium speed under the control of the controller, and the flow rate of the coolant is appropriate. The opening of the second throttling device is adjusted according to the temperature change on the temperature sensor, so that the cold energy obtained by the coolant after flowing through the plate heat exchanger can cool the liquid-cooled charging cable. At the same time, the temperature of the coolant after cooling the liquid-cooled charging cable is close to the temperature of the battery module, so that the heat exchange between the coolant and the battery module is reduced or eliminated when the coolant flows through the battery module, thus maintaining the battery module temperature within the appropriate operating temperature. When the battery temperature returned by the battery management system is lower than the battery's set temperature range, the water pump operates at a low speed under the control of the controller, reducing the flow rate of the coolant. The opening of the second throttling device is adjusted according to the temperature change on the temperature sensor, reducing its opening. When the system operates in this state, the coolant flowing through the plate heat exchanger receives less cold energy, causing the coolant temperature to rise after cooling the liquid-cooled charging cables. As the coolant flows through the battery module, it can heat the battery module until the battery module temperature rises to a suitable operating temperature.

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