Liquid cooling charging terminal with cooling liquid flow channel

Abstract

The utility model provides a liquid cooling charging terminal with a cooling liquid flow channel, which comprises a DC terminal, a DC sealing assembly and a shunting fitting, the shunting fitting is fixedly arranged in a cavity of the DC terminal and divides the cavity of the DC terminal into different cooling liquid fluid paths, and at least one fluid path is connected with the interior of a cable of the DC terminal to form backflow; and the DC sealing assembly is fixedly arranged at the end part of the DC terminal and is combined with the end part of the shunting accessory to be hermetically connected. According to the utility model, the shunting fitting is arranged in the DC terminal to construct a multipath cooling liquid flow channel, so that at least one fluid path is connected with the interior of the cable, cooling liquid backflow is formed, and the purpose of effective heat dissipation can be achieved; secondly, the DC sealing assembly is fixed to the end and connected with the flow dividing accessory in a sealed mode, and cooling liquid is prevented from overflowing.

Description

Technical Field

[0001] The utility model relates to the technical field of charging guns, in particular to a liquid-cooled charging terminal with a cooling liquid flow channel. Background Art

[0002] Liquid-cooled charging guns are an innovative electric vehicle charging solution. The principle is to use liquid cooling technology to effectively manage the heat generated during fast charging to improve charging efficiency, ensure equipment safety, and reduce charging time. With the rapid growth of global demand for electric vehicles, there is a need to solve the problems of time-consuming traditional charging methods and insufficient thermal management. The development of liquid cooling technology has a positive effect on environmental protection and reducing greenhouse gas emissions. By efficiently dissipating heat, it can not only accelerate the charging process, but also improve the stability and safety of charging equipment. Therefore, the application of liquid cooling technology in the field of electric vehicle charging is particularly important and urgent.

[0003] However, in the current liquid-cooled charging gun system, ① the installation method of the temperature sensor is crucial because it directly affects the efficiency and accuracy of the system's thermal management. The current installation method causes the temperature sensor to only indirectly measure the temperature of the DC terminal, which not only increases the measurement error, but may also affect the thermal control response of the liquid cooling system. In addition, the existing complex sensor fixing structure not only increases the manufacturing cost, but also has the problem of increased maintenance difficulty due to the complex structure. ② The through-hole design on the top of the inner core (shunt fitting) also has problems in the liquid cooling system, because it not only makes the DC sealing plug not firmly fixed, increasing the risk of equipment damage, but also has potential dangers caused by coolant overflow, destroying the sealing of the charging gun, affecting the integrity and cooling efficiency of the liquid cooling system, and the existing two-hole liquid inlet design of the inner core will cause uneven coolant flow, affecting the charging efficiency, and may cause system vibration, thereby affecting the stability and service life of the charging gun. ③ The existing DC sealing plugs using soldering have obvious defects in the liquid cooling system. Not only are they prone to slag falling off and blocking the flow channel, reducing the fluidity of the coolant and weakening the heat exchange efficiency; at the same time, there is also the possibility of coolant leakage due to the looseness of the soldering and poor sealing performance, further reducing the cooling effect and causing damage to the electronic components of the charging gun. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a liquid-cooled charging terminal with a coolant flow channel to solve the problems raised in the above background technology. The present invention adopts a shunt fitting to achieve uniform flow and heat dissipation of the coolant, thereby providing an environmentally friendly and reliable charging technology for electric vehicles. The problems in the prior art are solved.

[0005] To achieve the above object, the present utility model is realized through the following technical solutions: To achieve the above object, the present utility model is realized through the following technical solutions: A liquid-cooled charging terminal with a coolant flow channel, comprising a DC terminal, a DC sealing assembly and a shunt fitting. Among them, the shunt fitting is fixedly arranged in the cavity of the DC terminal and divides the cavity of the DC terminal into different coolant fluid paths. At least one of the fluid paths is connected to the inside of the cable of the DC terminal to form a reflux; the DC sealing assembly is fixedly arranged at the end of the DC terminal and is hermetically connected to the end of the shunt fitting.

[0006] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0007] First of all, by arranging a shunt fitting inside the DC terminal in the present utility model to construct a multi-path coolant flow channel, at least one fluid path is connected to the inside of the cable to form a coolant reflux, which can achieve the purpose of effective heat dissipation; secondly, the DC sealing assembly is fixed at the end and hermetically connected to the shunt fitting to prevent coolant from overflowing; thirdly, the DC sealing plug is engaged with the shunt fitting through a card slot and fixed to the DC terminal by laser welding technology, improving the structural stability; finally, a temperature sensor is arranged in the groove on the outer edge surface of the terminal, realizing the electrical connection with the controller, and at the same time avoiding the problem of large error in indirectly measuring the temperature of the DC terminal by the existing temperature sensor stuffed in a fixed metal hole and fixed to the DC terminal by screws. Description of the Drawings

[0008] The disclosure of the present utility model will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the protection scope of the present utility model. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0009] Figure 1 It is an exploded structural schematic diagram of a through hole opened at the top of the inner core of a metal flow channel in the prior art;

[0010] Figure 2 It is a schematic diagram of the coolant flow direction proposed in the first and second embodiments of the present utility model;

[0011] Figure 3A It is an internal sectional structural schematic diagram of a liquid-cooled charging terminal when the shunt fitting is a metal flow channel inner core in the first embodiment of the present utility model;

[0012] Figure 3B It is an exploded structural schematic diagram of a liquid-cooled charging terminal when the shunt fitting is a metal flow channel inner core in the first embodiment of the present utility model;

[0013] Figure 4ASchematic cross-sectional structure diagram of a liquid-cooled charging terminal when the shunt fitting in the second embodiment of the present utility model is a metal inner spacer;

[0014] Figure 4B Explosion structure diagram of a liquid-cooled charging terminal when the shunt fitting in the second embodiment of the present utility model is a metal inner spacer.

[0015] Reference numerals:

[0016] 1 - DC terminal, 11 - guiding groove, 2 - tee assembly, 3 - DC sealing assembly, 31 - DC sealing plug, 311 - clamping groove, 32 - insulating cap, 41 - metal runner inner core, 42 - metal inner spacer, 5 - cavity, 6 - cable, 7 - temperature sensor, 8 - metal fixing piece, 9 - groove, 10 - head through-hole, 11 - side-wall hole, 12 - coolant inlet pipe, 13 - coolant outlet pipe, A - DC sealing plug welding surface. Detailed implementation manners

[0017] It is easy to understand that according to the technical solution of the present utility model, without changing the essential spirit of the present utility model, those of ordinary skill in the art can propose various structural ways and implementation manners that can be mutually replaced. Therefore, the following detailed implementation manners and the accompanying drawings are only exemplary descriptions of the technical solution of the present utility model, and should not be regarded as the whole of the present utility model or as a limitation or restriction on the technical solution of the present utility model.

[0018] As shown in Figure 1 , it can be understood that in the current liquid-cooled charging gun system, the inner core through-hole adopts a design of 2 side-wall holes 11 plus 1 head through-hole 10, which causes risks such as unstable fixation of the DC sealing plug 31 and coolant overflow. At the same time, the liquid inlet through two holes will cause uneven flow and system vibration; furthermore, in the prior art, soldering the DC sealing plug easily clogs the flow channel and leaks, resulting in weakened cooling efficiency and system stability, increasing the maintenance difficulty and the risk of equipment damage.

[0019] Based on this, as the first embodiment of the present utility model, a technical solution is provided: a liquid-cooled charging terminal with a coolant flow channel, including: a DC terminal 1, a DC sealing assembly 3, and a shunt fitting.

[0020] During specific implementation, the shunt fitting preferably adopts a metal runner inner core 41, and the metal runner inner core 41, as the main channel for the coolant to flow, plays a role in isolating the cooling liquid. As shown in Figure 3A , Figure 3BAs shown, the metal runner inner core 41 is fixedly arranged in the cavity of the DC terminal 1, dividing the cavity 5 of the DC terminal 1 into different coolant fluid paths. To ensure that at least one fluid path is connected to the inside of the cable 6 of the DC terminal 1 to form a reflux, therefore, the metal runner inner core 41 is of a hollow structure, and the end connected to the DC sealing assembly 3 is sealed. It can be understood that the contact between the metal runner inner core 41 and the DC sealing assembly 3 is sealed to prevent the coolant from overflowing and leaking. Three through holes are provided on the side near the end of the metal runner inner core 41. At this time, as Figure 2 shown, the arrows in the figure indicate the flow direction of the coolant. Specifically, the coolant inlet adopts a tee component with one inlet and two outlets. The coolant first enters the tee component 2 through the coolant inlet pipe 12 and then is divided into two groups, which respectively enter the inner walls of the terminal DC+ and the terminal DC- and the sandwich layer of the metal runner inner core 41. The coolant flows from the bottom of the DC terminal 1 to the top of the metal runner inner core 41 by relying on the pressure, and then enters the hollow cavity of the metal runner inner core 41 through the three through holes opened, and flows into the cable inside the DC terminal 1, thereby taking away the heat of the DC terminal 1 and the wire to achieve the purpose of heat dissipation, and finally forms a reflux through the coolant outlet pipe 13. It should be noted that the above heat dissipation principle is: when the coolant flows through the metal runner inner core 41 and contacts the inner wall of the DC terminal 1, it will absorb the heat generated by the DC terminal 1 and the cable, and along with the flow of the coolant, this heat will be taken away, thereby reducing the temperature of the DC terminal.

[0021] The above-mentioned DC sealing assembly 3 is fixedly arranged at the end of the DC terminal 1 and is hermetically connected to the end of the metal runner inner core 41. It should be noted that this hermetic connection means that the top of the metal runner inner core 41 is changed to a sealing head structure to ensure that the coolant will not overflow, and the coolant can only enter through the three through holes, realizing the uniform entry and stable flow rate of the coolant.

[0022] In the first embodiment of the present utility model, the DC sealing assembly 3 includes a DC sealing plug 31 and an insulating cap 32 threadedly connected to the DC sealing plug 31. Specifically, during implementation, a clamping groove 311 is provided at the connection of the DC sealing plug 31 near the inner core 41 of the metal flow channel. The DC sealing plug 31 penetrates through the DC terminal 1 and is clamped with the inner core 41 of the metal flow channel through the clamping groove 311. At the same time, a guiding groove 11 is provided at the DC terminal 1 away from the connection of the DC sealing plug 31 and the inner core 41 of the metal flow channel. The guiding groove 11 is clamped with the inner core 41 of the metal flow channel. It can be understood that at this time, the guiding groove 11 can preferably be an annular groove or a recessed sink. Thus, the bottom end of the inner core 41 of the metal flow channel is fixed in the annular groove or recessed sink of the DC terminal 1, ensuring the stability and position accuracy of the inner core 41 of the metal flow channel during the coolant flow process. At the same time, since the existing DC sealing plug 31 is soldered by tin, it is easy to drop slag into the inner core and block the flow channel. Therefore, it is proposed that the DC sealing plug 31 and the DC terminal 1 be welded by laser welding to ensure the solder joint, that is, to ensure the firmness and sealing performance of the welding surface A of the DC sealing plug.

[0023] An interface matching the external three-way assembly 2 is provided on the side of the DC terminal 1. The interface is connected to the three-way assembly 2 by threading or insertion, and the interface communicates with the fluid path, that is, the interface communicates with the inner walls of the terminal DC+ and the terminal DC and the sandwich layer of the inner core of the metal flow channel. It should be noted that since the charging gun will generate heat and corrosive coolant (such as oil or ethylene glycol) during high-current and high-power operations, which will affect the structure of the three-way pipe assembly, the present utility model also proposes to use PEEK material with high temperature resistance, corrosion resistance, self-lubricating property and good mechanical properties to manufacture the three-way assembly 2.

[0024] As the first embodiment of the present utility model, since the existing temperature sensor 7 is stuffed into a fixed metal hole and fixed to the DC terminal by screws to indirectly measure the temperature of the DC terminal 1, there is a risk of large error. The present utility model proposes to provide a groove 9 on the outer edge surface of the DC terminal 1, and a temperature sensor 7 electrically connected to an external controller is disposed in the groove 9. At the same time, a metal fixing piece 8 is used in cooperation with screws to fix the temperature sensor 7. The temperature sensor 7 preferably uses a thermistor. After real-time measurement of the terminal temperature, it feeds back to the external controller, and the output flow of the coolant is adjusted by controlling the external radiator to achieve the effect of controlling the temperature.

[0025] The coolant used above is any one of insulating heat-conducting oil, softened water and ethylene glycol or any combination thereof.

[0026] As the second embodiment of the present utility model, a technical solution is provided: a liquid-cooled charging terminal with a coolant flow channel, including: a DC terminal 1, a DC sealing assembly 3, a temperature sensor 7, and a shunt fitting. It should be noted that the component structures or installation methods of the DC terminal, the DC sealing assembly, and the temperature sensor are all the same as those in the above-mentioned first embodiment, and will not be described in detail here.

[0027] As Figure 4A , Figure 4B shown, the shunt fitting at this time is preferably a metal inner spacer 42. The same metal inner spacer 42 is fixed in the cavity 5 of the DC terminal 1, dividing the cavity of the DC terminal 1 into different coolant fluid paths. At least one fluid path is connected to the inside of the cable of the DC terminal to form a reflux.

[0028] During specific implementation, the two ends of the metal inner spacer 42 are respectively engaged with the card slots 311 at the DC sealing plug 31 and the guiding grooves 11 at the DC terminal 1, aiming to ensure the stability and position accuracy of the metal inner spacer 42 during the flow of the coolant. In order to form a reflux, two through holes are opened on the outer edge surface of the end of the metal inner spacer 42 close to the DC sealing plug 31. At this time, still as Figure 2 shown, the coolant inlet adopts a three-way component with one inlet and two outlets. After entering the three-way component 2, it is divided into two groups and enters the terminal DC+ and the terminal DC- respectively. The inside of the DC terminal is separated by the metal inner spacer 42. Therefore, the coolant flows from the bottom of one side of the DC terminal 1 to the top of the cavity 5 by pressure, enters the other side of the inner cavity of the DC terminal 1 through the two through holes opened by the metal inner spacer 42, and then flows into the cable 6 of the DC terminal 1, thereby taking away the heat of the DC terminal 1 and the wire, achieving the purpose of heat dissipation. At the same time, the temperature sensor 7 on the DC terminal 1 measures the terminal temperature in real time, feeds it back to the peripheral controller, and controls the output flow of the coolant by controlling the peripheral radiator to achieve the effect of temperature control.

[0029] Based on the above technical concept, during specific implementation, the DC sealing plug 1 needs insulation protection to prevent electrical interference or short circuit.

[0030] The technical scope of the present utility model is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present utility model, and these deformations and modifications should all fall within the protection scope of the present utility model.

Claims

1. A liquid-cooled charging terminal with a coolant flow channel, characterized in that, including a DC terminal, a DC sealing assembly and a shunt fitting, wherein the shunt fitting is fixedly arranged in the cavity of the DC terminal and divides the cavity of the DC terminal into different coolant fluid paths, and at least one of the fluid paths is connected to the inside of the cable of the DC terminal to form a reflux; the DC sealing assembly is fixedly arranged at the end of the DC terminal and is hermetically connected to the end of the shunt fitting.

2. The liquid-cooled charging terminal with a coolant flow channel according to claim 1, wherein the DC sealing assembly includes a DC sealing plug and an insulating cap threadedly connected to the DC sealing plug, wherein a clamping groove is formed in the DC sealing plug near the connection with the shunt fitting, and the DC sealing plug penetrates through the DC terminal and is clamped with the shunt fitting through the clamping groove; the DC sealing plug and the DC terminal are welded by laser welding.

3. The liquid-cooled charging terminal with a coolant flow channel according to claim 2, wherein a guiding groove is formed in the DC terminal away from the connection between the DC sealing plug and the shunt fitting, and the guiding groove is clamped with the shunt fitting.

4. The liquid-cooled charging terminal with a coolant flow channel according to claim 1, wherein an interface matching with an external three-way assembly is formed on the side of the DC terminal, and the interface is threadedly or plug-connected to the three-way assembly, and the interface communicates with the fluid path.

5. The liquid-cooled charging terminal with a coolant flow channel according to claim 4, wherein a groove is formed on the outer edge surface of the DC terminal, and a temperature sensor electrically connected to an external controller is arranged in the groove.

6. The liquid-cooled charging terminal with a coolant flow channel according to claim 1, wherein the shunt fitting is made of a metal material.

7. The liquid-cooled charging terminal with a coolant flow channel according to claim 1, wherein the coolant is any one of insulating heat-conducting oil, softened water and ethylene glycol or any combination thereof.

8. The liquid-cooled charging terminal with a coolant flow channel according to claim 1, wherein the DC terminal includes a terminal DC+ and a terminal DC-, and the terminal DC+ and the terminal DC- are respectively connected through an external three-way assembly.

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