Charging pile with charging gun head of refrigeration structure and use method of charging pile

Abstract

The invention relates to the technical field of charging piles, in particular to a charging pile with a charging gun head of a refrigeration structure and a using method thereof.The charging pile comprises a charging pile body and a gun head body connected with the charging pile body through a wire harness and further comprises a first refrigeration mechanism used for cooling the gun head body during charging; the first refrigeration mechanism is used for charging the gun head body, the second refrigeration mechanism is used for cooling the charged gun head body, and the first refrigeration mechanism comprises a containing container containing a phase change material and heat dissipation fins located on the outer side of the containing container. By means of the high heat absorption capacity of the phase change material and the efficient heat transfer performance of the heat pipe, the cooling effect on the charging gun head is achieved, the structure is compact, large auxiliary equipment does not need to be additionally arranged, when waste heat which is not dissipated exists on the gun head body after use, cooling of the first cooling mechanism can be assisted through the second cooling mechanism, and the cooling efficiency is improved. And the heat dissipation effect of the charging gun head is accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a charging pile with a charging gun head having a refrigeration structure and a method for using the same. Background Art

[0002] The heating of the charging gun head of new energy vehicles during the charging process is an issue that needs attention. Under normal circumstances, the charging gun head should maintain an appropriate temperature. If the charging gun head is found to be hot, it may mean that there is an abnormal situation, such as the charging current is too large, or the charging environment temperature is too high. In this case, appropriate measures should be taken to reduce the temperature to ensure the safety and efficiency of the charging process. With the continuous development of new energy vehicle charging technology, fast charging technology is also becoming more and more popular. Fast charging (high-power DC charging) usually uses a larger charging current, which can charge a large amount of power into the battery in a shorter time. The battery can be fully charged to 80% of its capacity in half an hour. Fast charging does make the charging speed fast, but At the same time, the heat generated is also greater, and when one vehicle is charged, there is still heat left on the charging gun head that has not dissipated. At this time, in order to avoid affecting the charging effect of the next vehicle, it may wait for the heat of the charging gun head to dissipate before charging, which wastes time. At present, some charging gun heads are designed with liquid nitrogen systems for refrigeration and cooling. Although the charging gun head can be cooled very quickly with good cooling effect, the extremely low temperature of liquid nitrogen can easily cause frostbite, and there is a certain risk when using it. If leakage occurs during operation, it may cause serious damage to personnel and equipment. In addition, the storage and supply of liquid nitrogen require special equipment and technology, which will increase the complexity and cost of the system.

[0003] Based on the above situation, we propose a charging pile with a charging gun head with a refrigeration structure to solve the above problems. Summary of the invention

[0004] The present invention provides a charging pile with a charging gun head having a refrigeration structure and a use method thereof, so as to solve the problem of poor safety and high cost of cooling by liquid nitrogen in the prior art.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0006] A charging pile with a charging gun head with a refrigeration structure, comprising a charging pile body and a gun head body connected to the charging pile body through a wiring harness, and also comprising a first refrigeration mechanism for cooling the gun head body during charging, and a second refrigeration mechanism for cooling the gun head body after charging, wherein the first refrigeration mechanism comprises a container containing a phase change material and heat dissipation fins located outside the container, the container is connected to the outside of the gun head body, and the heat dissipation fins are connected to the container through a heat pipe, the second refrigeration mechanism is arranged on the charging pile body, the second refrigeration mechanism comprises a cooling box containing a coolant and a cooling component arranged on the cooling box to cool the coolant inside the cooling box, and when the gun head body is inserted into the socket of the charging pile body, the cooling box contacts the heat dissipation fins.

[0007] Preferably, the cooling component comprises a semiconductor refrigeration sheet, a heat absorbing end of the semiconductor refrigeration sheet is connected to a cooling box, and a heat releasing end of the semiconductor refrigeration sheet is connected to a heat sink.

[0008] Preferably, it also includes a controller and a temperature sensor electrically connected to the controller, wherein the temperature sensor is arranged on the inner wall of the cooling box and is used to detect the temperature of the heat sink fins, and the controller starts the semiconductor refrigeration plate after receiving the signal from the temperature sensor.

[0009] Preferably, there are multiple groups of heat dissipation fins, the multiple groups of heat dissipation fins are mutually nested, and two adjacent heat dissipation fins are connected via a hollow ring.

[0010] Preferably, the heat dissipation fins and the outer walls of the heat dissipation plate are coated with a high emissivity coating.

[0011] Preferably, a high thermal conductivity coating is provided on the inner wall of the container on one side close to the gun head body.

[0012] Preferably, a plurality of protrusions are provided on the inner wall of the containing container on one side close to the gun head body.

[0013] A method for using a charging pile with a charging gun head having a refrigeration structure, based on the above-mentioned charging pile with a charging gun head having a refrigeration structure, comprises the following steps:

[0014] S1: When the gun tip generates heat during charging, the phase change material in the container absorbs the heat of the gun tip body and transfers the heat to the heat dissipation fins through the heat pipe, and the heat is dissipated through the heat dissipation fins;

[0015] S2: When the charging gun head is inserted into the charging pile body, when the temperature of the heat sink fins detected by the temperature sensor exceeds the warning temperature, the controller starts the second refrigeration mechanism to cool the first refrigeration mechanism;

[0016] S3: After the semiconductor refrigeration chip is powered on, the coolant in the cooling box is cooled down, so that it can assist in cooling the heat sink fins.

[0017] The present invention has the following beneficial effects:

[0018] The charging pile with a charging gun head having a refrigeration structure and the use method thereof, by combining phase change material and heat pipe technology, utilizes the high heat absorption capacity of the phase change material and the efficient heat transfer performance of the heat pipe to achieve a cooling effect on the charging gun head. The structure is compact, no additional large-scale auxiliary equipment is required, and it is easy to be installed on the existing charging gun head. There is no need for large-scale modification of the charging equipment. When there is residual heat that has not been dissipated on the gun head body after use, the second refrigeration mechanism can assist in cooling the first refrigeration mechanism, accelerate the heat dissipation effect of the charging gun head, enable it to start charging work faster, and reduce waiting time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 An isometric structural schematic diagram provided by the present invention;

[0021] Figure 2 A schematic diagram of the structure when the first refrigeration mechanism and the second refrigeration mechanism are separated in the present invention;

[0022] Figure 3 A schematic cross-sectional structure diagram of a first refrigeration mechanism provided in the present invention;

[0023] Figure 4 A schematic cross-sectional structure diagram of the second refrigeration mechanism provided in the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the heat dissipation fins in the present invention;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the container in the present invention;

[0026] Figure 7 is a schematic diagram of the cross-sectional structure of the heat pipe in the present invention;

[0027] Figure 8 A system block diagram provided by the present invention.

[0028] In the figure, 1. Charging pile body; 2. Gun head body; 3. Container; 31. Protrusion; 4. Heat dissipation fins; 41. Hollow ring; 5. Heat pipe; 51. Tube shell; 52. Liquid absorption core; 6. Cooling box; 61. Semiconductor refrigeration sheet; 62. Heat sink; 7. Controller; 71. Temperature sensor; 72. Alarm; 8. High emissivity coating; 9. High thermal conductivity coating. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0030] Reference Figure 1-Figure 8 As shown, a charging pile with a charging gun head with a refrigeration structure includes a charging pile body 1 and a gun head body 2 connected to the charging pile body 1 through a wiring harness, and also includes a first refrigeration mechanism for cooling the gun head body 2 during charging and a second refrigeration mechanism for cooling the gun head body 2 after charging. The first refrigeration mechanism includes a container 3 containing a phase change material and heat dissipation fins 4 located on the outside of the container 3. The container 3 is connected to the outside of the gun head body 2, and the heat dissipation fins 4 are connected to the container 3 through a heat pipe 5. The phase change material can be paraffin or fatty acid material. When the gun head body 2 is inserted into a vehicle for charging and heats up, the phase change material in the container 3 absorbs heat and gradually changes from solid to liquid. At the same time, the heat pipe 5 quickly transfers the heat to the heat dissipation fins 4, and dissipates the heat to the surrounding environment through air convection to achieve heat dissipation of the gun head body 2. Figure 7As shown, the heat pipe 5 includes a tube shell 51, a liquid wick 52 and a working liquid in the tube shell 51. When the heated end of the heat pipe 5, that is, the end connected to the container 3, is subjected to the heat of the phase change material heated inside, the working liquid (such as water, ethanol, etc.) at this end absorbs heat and the temperature rises. When the boiling point of the working liquid is reached, the liquid begins to evaporate and turns into steam. Since the thermal conductivity of steam is much higher than that of liquid, the steam will quickly move to the other end (condensation end) of the heat pipe 5. In this process, the steam carries a large amount of heat. When the steam reaches the condensation end, because the temperature at this end is relatively low, the steam will release heat and re-condense into liquid. The condensed liquid is capillary under the action of the liquid wick 52 or under the action of gravity. Under the action of other forces, it flows back to the evaporation end. Through the evaporation, transmission and condensation cycle of the working liquid, the heat pipe 5 continuously transfers the heat from the evaporation end to the condensation end, and dissipates the heat and cools the condensation end through the heat dissipation fins 4, thereby realizing the cooling of the gun head body 2. The temperature change of the phase change material is relatively gentle during the heat absorption and heat release process, and can continuously provide a stable cooling effect for the gun head body 2 to avoid damage to the charging equipment caused by excessive temperature fluctuations. After absorbing heat, the phase change material can be restored to its initial state through natural heat dissipation or auxiliary heat dissipation at an appropriate time. There is no need to continuously consume a large amount of energy to maintain the refrigeration effect. Compared with liquid nitrogen refrigeration, no additional equipment is required, which is more energy-saving.

[0031] The wick is a part of the heat pipe and can be made of capillary structure materials, such as metal mesh, fiber felt, powder sintered body, etc. There are a large number of tiny pores and channels in these capillary structures. One end of the heat pipe is the hot end and the other end is the cold end. The hot end absorbs the working liquid inside the heat pipe to absorb heat, and the temperature rises and moves through the wick to the condensation end. After reaching the condensation section, it encounters a low temperature environment and releases heat to the outside world. The temperature drops and the steam condenses back into liquid. When the liquid at the condensation end flows back under the action of gravity or other external forces, the capillary channel of the wick provides a flow path for the liquid. Under the action of capillary force, the liquid flows again from the condensation section to the evaporation section along the wick, and so on to achieve cooling and heat dissipation. The wick and heat pipe are both existing technologies.

[0032] When the charging pile body 1 charges multiple vehicles continuously, although the gun head body 2 is cooled by the first refrigeration mechanism during charging and its temperature is reduced to below the warning temperature, the heat generated when charging the previous vehicle may not be completely dissipated. When charging the next vehicle, the gun head body 2 is heated again at the original temperature that has not been dissipated, so that the gun head body 2 is heated faster, which will also affect the subsequent cooling work. Therefore, after the charging of the previous vehicle is completed, the gun head body 2 can be briefly inserted into the socket of the charging pile body 1, and the second refrigeration mechanism provided on the charging pile body 1 is used for auxiliary cooling, so as to obtain a better cooling effect when the charging work of the next vehicle is in progress;

[0033] Specifically, refer to Figure 4 As shown, the second refrigeration mechanism includes a cooling box 6 filled with coolant and a cooling component arranged on the cooling box 6 to cool the coolant inside the cooling box. When the gun head body 2 is inserted into the socket of the charging pile body 1, the cooling box 6 contacts the heat dissipation fins 4, and the heat dissipation fins 4 transfer heat to the coolant in the cooling box 6 to dissipate heat, and make the phase change material in the container 3 gradually change from liquid to solid, so that the first refrigeration mechanism restores the best refrigeration state, so as to provide a better cooling effect when the gun head body 2 is charged subsequently.

[0034] Reference Figure 1-Figure 5 As shown, the cooling component includes a semiconductor refrigeration sheet 61, the heat absorption end of the semiconductor refrigeration sheet 61 is connected to the cooling box 6, and the heat release end of the semiconductor refrigeration sheet 61 is connected to the heat sink 62. The semiconductor refrigeration sheet 61 is based on the Peltier effect and is composed of P-type and N-type semiconductor materials arranged alternately. When a direct current passes through, electrons and holes will move in the semiconductor material. In this process, heat will be absorbed at one end to lower the temperature, that is, the heat of the coolant is absorbed to lower the temperature of the coolant, and the other end will release heat, that is, release heat to the heat sink 62, and dissipate the heat through the heat sink 62. The cooling effect or temperature can be adjusted by controlling the current size and direction. This technology is a prior art, and people in this field should be aware of it, so no further elaboration will be made here.

[0035] It also includes a controller 7 and a temperature sensor 71 electrically connected to the controller 7. The temperature sensor 71 is arranged on the inner wall of the cooling box 6 for detecting the temperature of the heat sink 4. The controller 7 starts the semiconductor refrigeration sheet 61 after receiving the signal from the temperature sensor 71. The temperature sensor preferably adopts a patch sensor, which can be installed on the inner wall of the cooling box 6 in contact with the heat sink 4 to detect the temperature of the heat sink 4. When the gun head body 2 drives the heat sink 4 to be inserted into the charging pile body 1 and contacts the cooling box 6 arranged at the socket of the charging pile body 1, the temperature sensor 71 will detect the temperature on the heat sink 4 at this time. If the temperature exceeds the set threshold, the signal will be transmitted. It is passed to the controller 7, and the controller 7 controls the semiconductor refrigeration sheet 61 to cool the coolant to cool the heat sink 4. At the same time, an alarm component 72 electrically connected to the controller 7 can be provided. If a buzzer, a warning light, etc., once the temperature exceeds a set threshold, the controller 7 can start the semiconductor refrigeration component and control the alarm component to sound an alarm to remind the user that the first refrigeration mechanism on the charging gun head is being cooled. After the cooling is completed, the gun head body 2 can be taken out for charging. The user can also detect the temperature of the gun head body 2 by inserting the gun head body 2 into the socket of the charging pile body 1 before use. If the alarm component 72 does not sound an alarm, it can be normally inserted into the vehicle for charging.

[0036] Reference Figure 3 as well as Figure 5 As shown, further, there are multiple groups of heat sink fins 4, and the multiple groups of heat sink fins 4 are mutually nested, that is, the multiple groups of heat sink fins 4 are coaxially arranged and the diameters gradually increase from the inside to the outside, and two adjacent heat sink fins 4 are connected by a hollow ring 41, so that there is a certain gap between two adjacent heat sink fins 4, which can allow air to flow away the temperature on the heat sink fins 4, and the hollow part on the hollow ring 41 will not block the airflow from the gap between the heat sink fins 4.

[0037] Further, see Figure 5 As shown, in order to dissipate the heat on the heat dissipation fins 4 and the heat dissipation plate 62 faster, the outer walls of the heat dissipation fins 4 and the heat dissipation plate 62 are coated with a high emissivity coating 8, such as a black ceramic coating, etc. This coating can absorb and emit electromagnetic waves in a wider wavelength range. During the heat dissipation process, the heat dissipation fins 4 and the heat dissipation plate 62 will absorb the transferred heat, and then convert it into thermal radiation and emit it. The high emissivity coating 8 can better absorb heat of different wavelengths and convert it into thermal radiation, thereby improving the heat dissipation efficiency.

[0038] Further, see Figure 6As shown, a high thermal conductivity coating 9 is provided on the inner wall of one side of the container 3 close to the gun head body 2. Materials with extremely high thermal conductivity such as nano-carbon tube coatings and graphene coatings can be selected. The thermal conductivity coefficient of these materials is much higher than that of ordinary materials, and the heat of the gun head body 2 can be quickly transferred to the phase change material, greatly improving the heat conduction speed.

[0039] Further, see Figure 6 As shown, a plurality of protrusions 31 are provided on the inner wall of one side of the container 3 close to the gun head body 2, wherein the shape and size of the protrusions 31 are not limited, and can be circular, square, etc., mainly to increase the contact area with the phase change material in the container 3, thereby improving the cooling effect.

[0040] The present invention also provides a method for using a charging pile with a charging gun head having a refrigeration structure. The method is implemented based on the above-mentioned charging pile with a charging gun head having a refrigeration structure. The method comprises the following steps:

[0041] S1: When the gun tip generates heat during charging, the phase change material in the container 3 absorbs the heat of the gun tip body 2, and transfers the heat to the heat dissipation fins 4 through the heat pipe 5, and the heat is dissipated through the heat dissipation fins 4;

[0042] S2: When the charging gun head is inserted into the charging pile body 1, when the temperature sensor 71 detects that the temperature of the heat dissipation fins 4 exceeds the warning temperature, the controller 7 starts the second refrigeration mechanism to cool the first refrigeration mechanism;

[0043] S3: After the semiconductor refrigeration chip 61 is powered on, the coolant in the cooling box 6 is cooled down, so that the cooling fins 4 are assisted in cooling down.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A charging pile with a charging gun head with a refrigeration structure, comprising a charging pile body (1) and a gun head body (2) connected to the charging pile body (1) via a wiring harness, characterized in that: It also includes a first refrigeration mechanism for cooling the gun head body (2) during charging, the first refrigeration mechanism including a container (3) containing phase change material and a heat dissipation fin (4) located outside the container (3), the container (3) is connected to the outside of the gun head body (2), and the heat dissipation fin (4) and the container (3) are connected via a heat pipe (5); A second refrigeration mechanism for cooling the gun head body (2) after charging, the second refrigeration mechanism being arranged on the charging pile body (1), the second refrigeration mechanism comprising a cooling box (6) containing a coolant and a cooling component arranged on the cooling box (6) for cooling the coolant inside the cooling box; When the gun head body (2) is inserted into the socket of the charging pile body (1), the cooling box (6) contacts the heat dissipation fins (4).

2. A charging pile with a charging gun head having a refrigeration structure according to claim 1, characterized in that: The cooling component comprises a semiconductor refrigeration sheet (61), the heat absorption end of the semiconductor refrigeration sheet (61) is connected to the cooling box (6), and the heat release end of the semiconductor refrigeration sheet (61) is connected to a heat dissipation plate (62).

3. A charging pile with a charging gun head with a refrigeration structure according to claim 2, characterized in that: It also includes a controller (7) and a temperature sensor (71) electrically connected to the controller (7); the temperature sensor (71) is arranged on the inner wall of the cooling box (6) and is used to detect the temperature of the heat dissipation fins (4); the controller (7) starts the semiconductor cooling plate (61) to work after receiving a signal from the temperature sensor (71).

4. The charging pile with a charging gun head having a refrigeration structure according to claim 1, characterized in that: The number of the heat dissipation fins (4) is multiple groups, the multiple groups of heat dissipation fins (4) are mutually nested, and two adjacent heat dissipation fins (4) are connected via a hollow ring (41).

5. The charging pile with a charging gun head having a refrigeration structure according to claim 2, characterized in that: The outer walls of the heat dissipation fins (4) and the heat dissipation plate (62) are both coated with a high emissivity coating (8).

6. The charging pile with a charging gun head having a refrigeration structure according to claim 1, characterized in that: A high thermal conductivity coating (9) is provided on the inner wall of one side of the containing container (3) close to the gun head body (2).

7. The charging pile with a charging gun head having a refrigeration structure according to claim 1, characterized in that: A plurality of protrusions (31) are provided on the inner wall of one side of the containing container (3) close to the gun head body (2).

8. A method for using a charging pile with a charging gun head having a refrigeration structure, based on the charging pile with a charging gun head having a refrigeration structure according to any one of claims 1 to 7, characterized in that: The steps include: S1: When the gun tip generates heat during charging, the phase change material in the container (3) absorbs the heat of the gun tip body (2), and transfers the heat to the heat dissipation fins (4) via the heat pipe (5), and the heat is dissipated via the heat dissipation fins (4); S2: When the charging gun head is inserted into the charging pile body (1), when the temperature of the heat dissipation fin (4) is detected by the temperature sensor (71) to be higher than the warning temperature, the controller (7) starts the second refrigeration mechanism to cool the first refrigeration mechanism; S3: After the semiconductor refrigeration plate (61) is powered on, the cooling liquid in the cooling box (6) is cooled, thereby assisting the cooling of the heat dissipation fins (4).

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