Wrapping type micro-electric heating system in charging pile in high and cold area and control method

Abstract

The invention discloses a wrapping type micro-electric heating system in a charging pile in a high and cold area. The wrapping type micro-electric heating system comprises a charging pile electrical cabinet body, and a plurality of electrical units with shell structures are discretely distributed in the charging pile electrical cabinet body; the heating device further comprises a plurality of wrapping type heating units, and each wrapping type heating unit is attached to the surface of a shell of each electrical unit. The wrapping type heating unit comprises a heating unit, a heat preservation unit, a heat conduction unit and a heat transfer unit. The heat transfer unit is clamped between the heat preservation unit and the heat conduction unit. The heat conduction unit is attached to the surface of a shell of the electrical unit. Heat generated by the heating unit can be uniformly transferred to any part of the heat conduction unit through the heat transfer unit; according to the scheme of the invention, heat is uniformly transferred to the attached electrical unit by the heat conducting sheet, so that the problem that the electrical unit is too cold in an extremely cold state is avoided; and meanwhile, the temporary heat dissipation requirement caused by the heat effect in the high-current working process of the heated electrical unit is also considered.

Description

Technical Field

[0001] The present invention belongs to the field of charging piles in extremely cold regions. Background Art

[0002] In alpine regions, charging piles face extremely low temperature environments, which may lead to reduced battery charging efficiency, degraded equipment performance, or even damage. Low temperatures also affect the battery life and charging speed of electric vehicles, increasing user waiting time and inconvenience. Therefore, a system that can automatically adjust the temperature of each electrical component inside the charging pile is needed to keep each electrical component within an appropriate operating temperature range. While having a high energy efficiency ratio, the system should reduce energy consumption and operating costs, and also take into account the temporary heat dissipation requirements brought about by the heat effect during the high-current operation of the heated electrical components themselves. Summary of the Invention

[0003] Object of the Invention: To overcome the deficiencies in the prior art, the present invention provides a wrapped micro-electric heating system and control method inside a charging pile in alpine regions to avoid the problem of key electrical units inside the charging pile being too cold in extremely cold conditions.

[0004] Technical Solution: To achieve the above object, the wrapped micro-electric heating system inside a charging pile in alpine regions of the present invention includes a charging pile electrical cabinet body, and several electrical units with shell structures are discretely distributed inside the charging pile electrical cabinet body; it also includes several wrapped heating units, and each wrapped heating unit is attached to the surface of the shell of each electrical unit.

[0005] The wrapped heating unit includes a heating unit, a heat insulation unit, a heat conduction unit, and a heat transfer unit; the heat transfer unit is sandwiched between the heat insulation unit and the heat conduction unit, and the heat conduction unit is thermally attached to the surface of the shell of the electrical unit; the heat generated by the heating unit can be evenly transferred to any part of the heat conduction unit through the heat transfer unit.

[0006] Further, the heat insulation unit is a heat insulation sheet; the heat conduction unit is a heat conduction sheet, and the heat conduction sheet is thermally bonded to the surface of the shell of the electrical unit through thermal conductive silicone grease.

[0007] Further, the heat transfer unit includes a labyrinthine heat conduction strip that is bent in a zigzag maze pattern on a plane. The labyrinthine heat conduction strip is parallelly sandwiched between the heat conduction sheet and the heat insulation sheet, and the labyrinthine heat conduction strip divides the space between the heat conduction sheet and the heat insulation sheet into a zigzag labyrinth heat transfer channel.

[0008] Further, the labyrinthine heat conduction strip includes a left square vortex-shaped zigzag section and a right square vortex-shaped zigzag section, and a left vortex channel and a right vortex channel are respectively formed inside the left square vortex-shaped zigzag section and the right square vortex-shaped zigzag section.

[0009] Further, the vortex rotation directions of the left square vortex-shaped zigzag section and the right square vortex-shaped zigzag section are opposite;

[0010] The section of the left square vortex-shaped zigzag section farthest from the vortex center is denoted as the left far-center section, and the section of the right square vortex-shaped zigzag section farthest from the vortex center is denoted as the right far-center section. The left far-center section and the right far-center section are integrally connected and on the same extension line; the sections of the channels on the inner sides of the left far-center section and the right far-center section are respectively denoted as the left channel connection section and the right channel connection section.

[0011] The sections of the left square vortex-shaped zigzag section and the right square vortex-shaped zigzag section that are close to each other are respectively the left adjacent section and the right adjacent section. A ventilation channel that is open to the outside at one end is formed between the left adjacent section and the right adjacent section; there is a left hole hollowed out on the heat preservation sheet at the vortex center of the left vortex channel, and there is a right hole hollowed out on the heat preservation sheet at the vortex center of the right vortex channel; a micro-electric heating wire coil is fixedly installed at the axis center of the left hole through a left bracket. After the micro-electric heating wire coil is energized, it releases heat. A cylindrical tube is integrally coaxially arranged on the outer side of the left hole away from the labyrinth heat conduction strip. A spherical passive flexible diaphragm is coaxially arranged inside the cylindrical tube. The outer contour of the passive flexible diaphragm is sealingly connected to the inner contour of the cylindrical tube. A heat storage chamber is formed inside the passive flexible diaphragm, and the micro-electric heating wire coil is in the center of the heat storage chamber.

[0012] Furthermore, a permanent magnet is fixedly installed at the axis center of the right hole through a right bracket. An active flexible diaphragm is arranged on the outer side of the right hole away from the labyrinth heat conduction strip. The outer contour of the active flexible diaphragm is sealingly connected to the outer side surface of the heat preservation sheet. A volume actively changing chamber is formed inside the active flexible diaphragm. An electromagnetic coil is arranged at the axis center of the active flexible diaphragm. When the electromagnetic coil is alternately energized in the positive and negative directions, the active flexible diaphragm fluctuates up and down under the alternating magnetic attraction and magnetic repulsion forces between the permanent magnet and the electromagnetic coil, so that positive pressure and negative pressure are alternately formed inside the volume actively changing chamber.

[0013] Furthermore, a rotary air distribution disc is rotatably arranged at the intersection of the left channel connection section, the right channel connection section and the ventilation channel. The outer peripheral surface of the rotary air distribution disc is in sliding tangency or clearance fit with the three inner wall surfaces at the intersection of the left channel connection section, the right channel connection section and the ventilation channel; an arc-shaped air guide channel is arranged on the air distribution disc. In the initial state, the arc-shaped air guide channel connects the left channel connection section and the right channel connection section to each other, and the outer peripheral surface of the air distribution disc blocks one end of the ventilation channel; when the rotary air distribution disc rotates a certain angle, the arc-shaped air guide channel connects the right channel connection section and one end of the ventilation channel to each other, and the outer peripheral surface of the air distribution disc blocks the end of the left channel connection section;

[0014] Furthermore, a working method of the enclosed micro-electric heating system in a charging pile in a high-cold area, characterized in that: "in the heating mode": the arc-shaped air guide channel connects the left channel connection section and the right channel connection section to each other, and the outer peripheral surface of the air distribution disc blocks one end of the ventilation channel; at this time, control the micro-electric heating wire coil to be energized, and at the same time alternately energize the electromagnetic coil in the positive and negative directions;

[0015] In the "efficient heat dissipation mode":

[0016] Step 1: Immediately cut off the power supply of the microelectric heating wire coil;

[0017] Step 2: Rotate the air distribution disc until the arc-shaped air guide channel connects the right channel connecting section with one end of the ventilation channel;

[0018] Step 3: Apply positive power to the electromagnetic coil;

[0019] Step 4: Rotate the air distribution disc until the arc-shaped air guide channel connects the left channel connecting section with the right channel connecting section;

[0020] Step 5: Apply reverse power to the electromagnetic coil;

[0021] Step 6: Apply positive power to the electromagnetic coil;

[0022] Continuously cycle "Step 2" to "Step 6".

[0023] Beneficial effects: The solution of the present invention not only realizes that the heat conducting sheet evenly transfers heat to the attached electrical unit, thus avoiding the problem of the electrical unit being too cold in the extremely cold state; at the same time, it also takes into account the temporary heat dissipation requirements brought by the heat effect during the high-current operation of the heated electrical unit itself. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the internal structure of the charging pile;

[0025] Figure 2 It is a schematic diagram of the overall temperature control strategy;

[0026] Figure 3 It is a schematic diagram of the wrap-around heating unit attached to the outer surface of a certain electrical unit;

[0027] Figure 4 It is Figure 3 the disassembly diagram of;

[0028] Figure 5 It is the disassembly diagram of the wrap-around heating unit from the back view;

[0029] Figure 6 It is a schematic diagram of the wrap-around heating unit from the back view with the heat conducting sheet hidden. In this state, the arc-shaped air guide channel connects the left channel connecting section with the right channel connecting section;

[0030] Figure 7 It is a schematic diagram of the wrap-around heating unit from the back view with the heat conducting sheet hidden. In this state, the arc-shaped air guide channel connects the right channel connecting section with one end of the ventilation channel;

[0031] Figure 8 It isFigure 7 Cross-sectional view. Detailed implementation

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] As shown in the attached Figures 1 to 8 The enclosed micro-electric heating system in the charging pile in the alpine region shown, as Figure 1 shown, includes a charging pile electrical cabinet 41, and a number of electrical units 9 with shell structures are discretely distributed in the charging pile electrical cabinet 41; it also includes a number of enclosed heating units 51, and each enclosed heating unit 51 is attached to the outer surface of each electrical unit 9; the enclosed heating unit 51 includes a heating unit, a heat preservation unit, a heat conduction unit and a heat transfer unit; the heat transfer unit is sandwiched between the heat preservation unit and the heat conduction unit, and the heat conduction unit is thermally attached to the outer surface of the electrical unit 9; the heat generated by the heating unit can be evenly transferred to any part of the heat conduction unit through the heat transfer unit.

[0034] The electrical unit 9 can be an air switch, a power module, a controller, a DC contactor, an AC circuit breaker, a DC charging module, etc., and a housing is provided on the outside of the electrical unit 9.

[0035] As Figures 3 to 8 shown, the heat preservation unit is a heat preservation sheet 14 with a low thermal conductivity, and the heat preservation sheet 14 can be a rectangular plate-like structure with a hard plastic structure on the outer surface and a heat preservation material such as polyurethane foam filled inside; the heat conduction unit is a heat conduction sheet 18 with a high thermal conductivity, such as an aluminum sheet or a copper sheet, and the heat conduction sheet 18 is thermally bonded to the outer surface of the electrical unit 9 through a thermally conductive silicone adhesive. The heat transfer unit includes a labyrinthine heat conduction strip 1 that is bent and distributed in a zigzag maze pattern on a plane. The labyrinthine heat conduction strip 1 is parallelly sandwiched between the heat conduction sheet 18 and the heat preservation sheet 14, and the labyrinthine heat conduction strip 1 divides the space between the heat conduction sheet 18 and the heat preservation sheet 14 into a zigzag labyrinth heat transfer channel.

[0036] As Figure 6 , 7 , 8; the labyrinthine heat conduction strip 1 includes a left square vortex-shaped zigzag section 1.1 and a right square vortex-shaped zigzag section 1.2, and a left vortex channel 2.1 and a right vortex channel 2.2 are respectively formed in the left square vortex-shaped zigzag section 1.1 and the right square vortex-shaped zigzag section 1.2; the vortex rotation directions of the left square vortex-shaped zigzag section 1.1 and the right square vortex-shaped zigzag section 1.2 are opposite;

[0037] The section of the left square vortex-shaped zigzag section 1.1 farthest from the vortex center is denoted as the left far-center section 1.1b, and the section of the right square vortex-shaped zigzag section 1.2 farthest from the vortex center is denoted as the right far-center section 1.2b. The left far-center section 1.1b and the right far-center section 1.2b are integrally connected and on the same extension line; the sections of the channels inside the left far-center section 1.1b and the right far-center section 1.2b are respectively denoted as the left channel connection section 2.1a and the right channel connection section 2.2b.

[0038] The sections of the left square vortex-shaped zigzag section 1.1 and the right square vortex-shaped zigzag section 1.2 that are close to each other are respectively the left adjacent section 1.1a and the right adjacent section 1.2a. A ventilation channel 3 that is open to the outside is formed between the left adjacent section 1.1a and the right adjacent section 1.2a; a left hole 4 is hollowed out on the heat insulation sheet 14 at the vortex center of the left vortex channel 2.1, and a right hole 5 is hollowed out on the heat insulation sheet 14 at the vortex center of the right vortex channel 2.2; a micro-electric heating wire coil 12 is fixedly installed at the axis center of the left hole 4 through a left bracket 8. The micro-electric heating wire coil 12 can be a graphene carbon fiber heating wire. After the micro-electric heating wire coil 12 is energized, it releases heat. A ring cylinder 20 is integrally coaxially arranged on the outer side of the left hole 4 away from the labyrinth heat conduction strip 1. A spherical passive flexible diaphragm 21 is coaxially arranged inside the ring cylinder 20. The outer contour of the passive flexible diaphragm 21 is sealingly connected to the inner contour of the ring cylinder 20. A heat storage chamber 10 is formed inside the passive flexible diaphragm 21, and the micro-electric heating wire coil 12 is at the center of the heat storage chamber 10.

[0039] A permanent magnet 13 is fixedly installed at the axis center of the right hole 5 through a right bracket 9. An active flexible diaphragm 22 is arranged on the outer side of the right hole 5 away from the labyrinth heat conduction strip 1. The outer contour of the active flexible diaphragm 22 is sealingly connected to the outer side surface of the heat insulation sheet 14. A volume actively changing chamber 11 is formed inside the active flexible diaphragm 22. An electromagnetic coil 23 is arranged at the axis center of the active flexible diaphragm 22. When the electromagnetic coil 23 is alternately energized forward and backward, the active flexible diaphragm 22 fluctuates up and down under the alternating magnetic attraction and magnetic repulsion between the permanent magnet 13 and the electromagnetic coil 23, so that positive pressure and negative pressure are alternately formed inside the volume actively changing chamber 11.

[0040] A rotary air distribution disc 6 is rotatably arranged at the intersection of the left channel connection section 2.1a, the right channel connection section 2.2b, and the ventilation channel 3. The outer peripheral surface of the rotary air distribution disc 6 is in sliding tangency or clearance fit with the three inner wall surfaces at the intersection of the left channel connection section 2.1a, the right channel connection section 2.2b, and the ventilation channel 3; an arc-shaped air guide channel 7 is arranged on the air distribution disc 6. In the initial state, as Figure 6 shown, the arc-shaped air guide channel 7 connects the left channel connection section 2.1a and the right channel connection section 2.2b to each other, and the outer peripheral surface of the air distribution disc 6 blocks one end of the ventilation channel 3.

[0041] When the rotary gas distribution disc 6 rotates a certain angle, about 110° clockwise, the arc-shaped air guide channel 7 connects the right channel connection section 2.2b with one end of the air exchange channel 3, and the outer peripheral surface of the gas distribution disc 6 blocks the end of the left channel connection section 2.1a, as Figure 7 shown;

[0042] The heat preservation piece 14 is provided with a rotating hole 15 hollowed out at the intersection of the left channel connection section 2.1a, the right channel connection section 2.2b and the air exchange channel 3. One end of the rotary gas distribution disc 6 rotates the rotating hole 15 and is coaxially fixedly connected with a gear 16. A rack 61 meshing with the gear 16 is arranged outside the heat preservation piece 14, and a linear driver 60 capable of driving the linear displacement of the rack 61 is further included.

[0043] The volume change amount in the heat storage chamber 10 formed inside due to the up and down fluctuation of the passive flexible diaphragm 21 is denoted as V1, and the volume change amount in the actively changing volume chamber 11 caused by the up and down fluctuation of the active flexible diaphragm 22 is denoted as V2; the total volume in the left vortex channel 2.1 and the right vortex channel 2.2 is denoted as V3; it satisfies V1 = V2 = V3;

[0044] Working principle:

[0045] The heat conducting sheet 18 of the wrap-around heating unit 51 is thermally bonded to the outer surface of the housing of the electrical unit 9 through heat conducting silicone grease.

[0046] In the heating mode: the arc-shaped air guide channel 7 connects the left channel connection section 2.1a with the right channel connection section 2.2b, and the outer peripheral surface of the gas distribution disc 6 blocks one end of the air exchange channel 3; as Figure 6 shown, at this time, the micro electric heating wire coil 12 is controlled to be energized, so that the micro electric heating wire coil 12 continuously heats the air in the heat storage chamber 10; at the same time, the electromagnetic coil 23 is alternately energized forward and reverse, and the active flexible diaphragm 22 fluctuates up and down under the alternating magnetic attraction and magnetic repulsion between the permanent magnet 13 and the electromagnetic coil 23, so that positive pressure and negative pressure are alternately formed in the actively changing volume chamber 11, and then the volume in the actively changing volume chamber 11 changes periodically in an alternating manner.

[0047] In any one of the above cycles:

[0048] When the volume in the actively variable volume chamber 11 gradually decreases, the air originally in the actively variable volume chamber 11 is forced into the left vortex channel 2.1 and the right vortex channel 2.2. The cold air originally in the left vortex channel 2.1 and the right vortex channel 2.2 is forced into the heat storage chamber 10, thereby increasing the pressure in the heat storage chamber 10. The passive flexible diaphragm 21 fluctuates in a direction away from the microelectric heating wire coil 12, forcing the volume in the heat storage chamber 10 to increase. At the same time, the microelectric heating wire coil 12 continuously heats and raises the temperature of the air in the heat storage chamber 10 with the increased volume. Subsequently, when the volume in the actively variable volume chamber 11 gradually increases, the air originally in the left vortex channel 2.1 and the right vortex channel 2.2 is sucked into the actively variable volume chamber 11 with an increased volume under the action of negative pressure, and the heated hot air in the heat storage chamber 10 is sucked into the left vortex channel 2.1 and the right vortex channel 2.2 under the action of negative pressure, so that the left vortex channel 2.1 and the right vortex channel 2.2 are evenly filled with hot air. At the same time, the passive flexible diaphragm 21 fluctuates in a direction close to the microelectric heating wire coil 12 under the action of negative pressure, causing the volume of the heat storage chamber 10 to passively decrease. At this time, the hot air evenly filled into the left vortex channel 2.1 and the right vortex channel 2.2 will uniformly transfer heat to the heat conducting sheet 18 through the labyrinth heat conducting strip 1 or directly, and then the heat conducting sheet 18 will uniformly transfer the heat to the electrical unit 9 attached thereto, thereby preventing the electrical unit 9 from being too cold in an extremely cold state;

[0049] It can be seen that when the electromagnetic coil 23 is alternately energized forward and backward and the microelectric heating wire coil 12 is continuously energized, the air in the left vortex channel 2.1 and the right vortex channel 2.2 will be repeatedly sucked into the heat storage chamber 10 for heating and then continuously return the heated air to the left vortex channel 2.1 and the right vortex channel 2.2, so that the heat conducting sheet 18 will uniformly transfer heat to the electrical unit 9 attached thereto, and then realize the process of efficient and uniform transfer and release of heat under the condition of local heating;

[0050] During the above heating process, when the temperature of the shell of the attached electrical unit 9 exceeds the threshold value, the heat of the electrical unit 9 needs to be released, and the original heat preservation sheet 14 will inhibit this process. Therefore, the present wrapping type heating unit 51 needs to enter the "high-efficiency heat dissipation mode", and the "high-efficiency heat dissipation mode" includes the following process:

[0051] Step 1, immediately cut off the power supply to the microelectric heating wire coil 12;

[0052] Step 2, control the linear actuator 60 to drive the rack 61, so that the rotary air distribution disk 6 rotates until the arc-shaped air guide channel 7 connects one end of the right channel connection section 2.2b with the air exchange channel 3, as Figure 7 shown, and the outer peripheral surface of the air distribution disk 6 blocks the end of the left channel connection section 2.1a;

[0053] Step 3: Apply forward power to the electromagnetic coil 23. The active flexible diaphragm 22 fluctuates towards the side away from the permanent magnet 13 under the repulsive force between the permanent magnet 13 and the electromagnetic coil 23, thereby increasing the volume in the volume active change chamber 11. Under the action of negative pressure, the outside cold air enters the right vortex channel 2.2 through the ventilation channel 3;

[0054] Step 4: Control the linear actuator 60 to drive the rack 61 to rotate the rotary air distribution disk 6 until the arc-shaped air guide channel 7 connects the left channel connection section 2.1a and the right channel connection section 2.2b to each other, as Figure 6 shown;

[0055] Step 5: Apply reverse power to the electromagnetic coil 23. The active flexible diaphragm 22 fluctuates towards the side close to the permanent magnet 13 under the magnetic attraction force between the permanent magnet 13 and the electromagnetic coil 23. The relatively cold air from the outside in the original right vortex channel 2.2 is squeezed into the left vortex channel 2.1 under the action of the active flexible diaphragm 22;

[0056] Step 6: Apply forward power to the electromagnetic coil 23. The active flexible diaphragm 22 fluctuates towards the side away from the permanent magnet 13 under the repulsive force between the permanent magnet 13 and the electromagnetic coil 23. The air that originally entered the left vortex channel 2.1 is re-sucked into the right vortex channel 2.2;

[0057] Continuously cycle "Step 2" to "Step 6", so that the air in the left vortex channel 2.1 and the right vortex channel 2.2 is periodically exchanged with the relatively cold air outside, thereby continuously taking away the heat of the heat conducting sheet 18 to achieve efficient heat dissipation of the attached electrical unit 9.

[0058] As Figure 2 shown in the overall control strategy:

[0059] (1) When the charging pile is powered on and starts up and is in the idle state: within 1 - 2 minutes after power-on, the program will automatically start running, receive the temperature data sent by multiple temperature sensors, and judge whether the temperatures of the current electrical units 9 such as air switches, power modules, controllers, DC contactors, AC circuit breakers, DC charging modules, etc. are within the normal range. If it is lower than the range, the software will control the corresponding attached heating unit 51 of each electrical unit 9 to enter the heating mode; at this time, the software will continuously obtain the data of the temperature sensors. When the temperature of a certain electrical unit 9 reaches the normal range temperature, the software will control the attached heating unit 51 to stop heating and turn off until the temperatures of all electrical units 9 are within the normal temperature range. On the contrary, when a certain part is lower than the set temperature range, the software will control the attached heating unit 51 of that part to enter the heating mode to start heating until it reaches the set temperature range and stops heating.

[0060] (2) During charging: The software will control the electrical unit 9 located in the DC charging module to stop working because a large amount of heat is dissipated when the DC charging module is working. When the electrical unit 9 temporarily exceeds the preset temperature range due to the thermal effect, the corresponding wrapped heating unit 51 enters the "efficient heat dissipation mode".

[0061] 4. Fault handling

[0062] (1) During the operation of the pile, if the temperature of a current electrical unit 9 exceeds the preset value, but the heating unit 51 has clearly stopped working, the software will restart the controller of the current wrapped heating unit 51. If the temperature still does not drop, the software will cut off the power supply of the controller of the wrapped heating unit 51 and send this event to the background server for maintenance personnel to come for inspection.

[0063] (2) If the temperature detected by the temperature sensor is abnormal, the software will cut off the power supply of the controller of that part of the heating element and send this event to the background server for maintenance personnel to come for inspection and judge the fault.

[0064] 5. Remote monitoring and data analysis

[0065] (1) Remote monitoring system: Establish a remote monitoring system for the charging pile to realize real-time monitoring and remote control of parameters such as temperature, current, voltage, and temperature. Collect and analyze the operation data of the charging pile to optimize the control strategy and improve the operation efficiency.

[0066] (2) Data analysis and optimization: Deeply mine and analyze the operation data of the charging pile to discover potential problems and trends. According to the analysis results, optimize and adjust the control strategy, layout of heating elements, and power output of the charging pile.

[0067] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. The enclosed micro-electric heating system in the charging pile in the cold region is characterized by: It comprises a charging pile electrical cabinet (41), wherein a plurality of electrical units (9) with shell structures are discretely distributed in the charging pile electrical cabinet (41); and it also comprises a plurality of enclosed heating units (51), wherein each of the enclosed heating units (51) is attached to the shell surface of each of the electrical units (9); The enclosed heating unit (51) comprises a heating unit, a heat preservation unit, a heat conduction unit and a heat transfer unit; the heat transfer unit is sandwiched between the heat preservation unit and the heat conduction unit, and the heat conduction unit is heat-conductingly attached to the outer shell surface of the electrical unit (9); the heat generated by the heating unit can be evenly transferred to any part of the heat conduction unit through the heat transfer unit.

2. The enclosed micro-electric heating system in the charging pile in the cold region according to claim 1 is characterized by: The heat-insulating unit is a heat-insulating sheet (14); the heat-conducting unit is a heat-conducting sheet (18), and the heat-conducting sheet (18) is heat-conductingly bonded to the outer shell surface of the electrical unit (9) by heat-conducting silicone grease.

3. The enclosed micro-electric heating system in the charging pile in the cold region according to claim 2 is characterized by: The heat transfer unit comprises a labyrinth-type heat-conducting strip (1) which is distributed in a tortuous labyrinth-like manner on a plane, the labyrinth-type heat-conducting strip (1) being sandwiched in parallel between a heat-conducting sheet (18) and a heat-insulating sheet (14), and the labyrinth-type heat-conducting strip (1) divides the space between the heat-conducting sheet (18) and the heat-insulating sheet (14) into a tortuous labyrinth-type heat transfer channel.

4. The enclosed micro-electric heating system in the charging pile in the cold region according to claim 3 is characterized by: The labyrinth-type heat-conducting strip (1) comprises a left-hand square spiral zigzag section (1.1) and a right-hand square spiral zigzag section (1.2), wherein a left spiral channel (2.1) and a right spiral channel (2.2) are formed in the left-hand square spiral zigzag section (1.1) and the right-hand square spiral zigzag section (1.2), respectively.

5. The enclosed micro-electric heating system in the charging pile in the cold region according to claim 3 is characterized by: The vortex rotation directions of the left square vortex-shaped zigzag section (1.1) and the right square vortex-shaped zigzag section (1.2) are opposite; The section of the left square vortex-shaped zigzag section (1.1) farthest from the vortex center is recorded as the left distal section (1.1b), and the section of the right square vortex-shaped zigzag section (1.2) farthest from the vortex center is recorded as the right distal section (1.2b). The left distal section (1.1b) and the right distal section (1.2b) are integrally connected and on the same extension line; a section of the channel inside the left distal section (1.1b) and the right distal section (1.2b) are recorded as the left channel connecting section (2.1a) and the right channel connecting section (2.2b) respectively; The sections of the left square spiral zigzag section (1.1) and the right square spiral zigzag section (1.2) that are close to each other are respectively the left adjacent section (1.1a) and the right adjacent section (1.2a); a ventilation channel (3) whose one end is connected to the outside is formed between the left adjacent section (1.1a) and the right adjacent section (1.2a); a left hole (4) is hollowed out on the heat preservation sheet (14) located at the center of the vortex of the left vortex channel (2.1); a right hole (5) is hollowed out on the heat preservation sheet (14) located at the center of the vortex of the right vortex channel (2.2); the axis of the left hole (4) is A micro-electric heating wire coil (12) is fixedly installed by a left bracket (8), and the micro-electric heating wire coil (12) releases heat after being energized. An annular cylinder (20) is coaxially arranged outside the left hole (4) on a side away from the labyrinth-type heat-conducting strip (1), and a spherical passive flexible diaphragm (21) is coaxially arranged inside the annular cylinder (20). The outer contour of the passive flexible diaphragm (21) is sealingly connected to the inner contour of the annular cylinder (20), and the inner side of the passive flexible diaphragm (21) forms a heat storage bin (10), and the micro-electric heating wire coil (12) is located in the center of the heat storage bin (10).

6. The enclosed micro-electric heating system in the charging pile in the cold region according to claim 5 is characterized by: A permanent magnet (13) is fixedly mounted at the axis of the right hole (5) through a right bracket (9); an active flexible diaphragm (22) is arranged outside the side of the right hole (5) away from the labyrinth-type heat-conducting strip (1); the outer contour of the active flexible diaphragm (22) is sealed and connected to the outer side of the heat-insulating sheet (14); the inner side of the active flexible diaphragm (22) forms an active volume change chamber (11); an electromagnetic coil (23) is arranged at the axis of the active flexible diaphragm (22); when the electromagnetic coil (23) is alternately energized in positive and negative directions, the active flexible diaphragm (22) fluctuates up and down under the alternating magnetic attraction and repulsion between the permanent magnet (13) and the electromagnetic coil (23), thereby alternately forming positive pressure and negative pressure in the active volume change chamber (11).

7. The enclosed micro-electric heating system in the charging pile in the cold region according to claim 6 is characterized by: A rotating gas distribution disk (6) is rotatably arranged at the intersection of the left channel connecting section (2.1a), the right channel connecting section (2.2b) and the ventilation channel (3); the outer peripheral surface of the rotating gas distribution disk (6) is slidably tangent to or gap-matched with the three inner wall surfaces at the intersection of the left channel connecting section (2.1a), the right channel connecting section (2.2b) and the ventilation channel (3); the gas distribution disk (6) is provided with an arc-shaped air guide channel (7); in an initial state, the arc-shaped air guide channel (7) connects the left channel connecting section (2.1a) and the right channel connecting section (2.2b) to each other, and the outer peripheral surface of the gas distribution disk (6) blocks one end of the ventilation channel (3); when the rotating gas distribution disk (6) rotates a certain angle, the arc-shaped air guide channel (7) connects the right channel connecting section (2.2b) and one end of the ventilation channel (3) to each other, and the outer peripheral surface of the gas distribution disk (6) blocks the end of the left channel connecting section (2.1a).

8. The working method of the enclosed micro-electric heating system in the charging pile in the cold region according to claim 7, characterized in that: "In heating mode": the arc-shaped air guide channel (7) connects the left channel connecting section (2.1a) and the right channel connecting section (2.2b) to each other, and the outer peripheral surface of the air distribution plate (6) blocks one end of the ventilation channel (3); at this time, the micro-electric heating wire coil (12) is controlled to be energized, and at the same time, the electromagnetic coil (23) is alternately energized in positive and negative directions; In "High Efficiency Cooling Mode": Step 1, immediately disconnect the power supply to the micro-electric heating wire coil (12); Step 2: Rotate the gas distribution plate (6) until the arc-shaped air guide channel (7) connects the right channel connecting section (2.2b) with one end of the ventilation channel (3); Step 3, energizing the electromagnetic coil (23) in the forward direction; Step 4, rotating the gas distribution plate (6) until the arc-shaped gas guide channel (7) connects the left channel connecting section (2.1a) and the right channel connecting section (2.2b) to each other; Step 5, the electromagnetic coil (23) is energized in the reverse direction; Step 6, the electromagnetic coil (23) is energized in the forward direction; Repeat "Step 2" to "Step 6" repeatedly.

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