High and cold area charging pile micro-electric heating assembly system and working method

Abstract

The invention discloses an alpine region charging pile micro-electric heating assembly system and a working method, and the system comprises an alpine region charging pile electrical box which is internally provided with a plurality of fixed micro-electric heating units and temperature sensors in a discrete manner. The plurality of fixed micro-electric heating units are distributed near a plurality of electrical elements needing special anti-freezing protection in an electrical box of the charging pile in the alpine region; and the risk problems of cracking of various elements of the charging pile, inflexible action part of the relay, performance reduction and the like in an extremely low temperature environment are effectively relieved.

Description

Technical Field

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

[0002] The extremely low temperature environment in high-cold areas may cause damage to the electronic components and mechanical parts inside the charging pile, such as causing various components on the circuit board to crack, the relay action part to be inflexible, and performance degradation. Therefore, electric heating wires are needed to assist in heating; in an extremely low temperature environment, the temperature of the electrical cabinet shell of the charging pile is very low. The existing heating wires attached to the inner wall of the electrical cabinet not only have the problem of uneven heating, but also the heat generated by the heating wire is absorbed by the chassis shell, and the chassis shell itself releases heat to the outside, resulting in low heating efficiency. The use of a fan combined with a heating wire will also accelerate the heat exchange between the relatively high temperature gas in the cabinet and the inner wall of the chassis shell, resulting in a high heat loss rate. The hanging heating wire in the center of the cabinet interferes with the inspection and maintenance of maintenance personnel, and there are also safety issues such as entanglement. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a micro-electric heating component system and working method for charging piles in high-cold areas. By coordinating fixed micro-electric heating units and vertical wire-type heating units, the risk of cracking of various components of the charging piles, inflexible action of relays, and performance degradation in extremely low temperature environments can be effectively alleviated.

[0004] Technical solution: To achieve the above-mentioned purpose, the micro-electric heating component system of the charging pile in the high-cold area of ​​the present invention includes an electrical box of the charging pile in the high-cold area, in which a number of fixed micro-electric heating units and temperature sensors are discretely arranged, and the number of fixed micro-electric heating units are distributed near a number of electrical components that require special antifreeze protection in the electrical box of the charging pile in the high-cold area; a number of vertical wire-type heating units are arranged in the top horizontal array in the electrical box of the charging pile in the high-cold area.

[0005] Furthermore, the fixed micro-electric heating units are all multi-layer structures; the innermost layer is the micro-current heating alloy wire, the middle layer is the insulating barrier layer; and the outermost layer is the heat dissipation layer.

[0006] Furthermore, the hanging wire type heating unit includes a reel drive motor and a heating wire reel fixedly installed on the top of the electrical box of the charging pile in the high-cold area. The end of the reel is coaxially connected to the heating wire reel, and the heating wire reel can lead out and recover the downward hanging micro-electric heating wire.

[0007] Furthermore, the micro-electric heating wire comprises an electric heating alloy wire inner core extending along the length direction and a flexible insulating outer sheath.

[0008] Furthermore, the heating wire reel comprises two insulating discs arranged at a coaxial distance, the two insulating discs are integrally connected via a coaxial insulating winding ring, and a winding ring groove is formed between the two insulating discs.

[0009] In a non-heating state, the micro-electric heating wire is wound in a winding ring groove outside the insulating winding ring to form an electric heating wire winding body.

[0010] Furthermore, a part of the insulating winding ring is provided with a notch, and a seesaw shaft is provided at the notch, insulating discs are fixed at both ends of the seesaw shaft, and a metal rotating sleeve is provided on the outside of the seesaw shaft through a bearing rotating sleeve, one side of the metal rotating sleeve is integrally connected with an arc-shaped metal seesaw extending out of the notch, and the other side of the metal rotating sleeve is integrally connected with a metal spring extending into the inner ring of the insulating winding ring; one end of the metal rotating sleeve is connected to a torsion spring, and in a free state, the torsion spring applies a counterclockwise torsion force to the metal rotating sleeve, so that the arc-shaped metal seesaw is tightly attached to the outer circumferential surface of the insulating winding ring; a metal contact rod is provided at the inner side of the notch of the insulating winding ring, and when the inner arc surface of the arc-shaped metal seesaw is tightly attached to the outer circumferential surface of the insulating winding ring, the metal contact rod is separated from the metal spring, and on this basis, the metal spring swings clockwise around the axis of the seesaw shaft until it contacts and electrically connects to the metal contact rod.

[0011] Furthermore, the end of the metal contact rod is fixedly connected to the insulating disc; the metal contact rod is electrically connected to the metal slip ring on the insulating disc through the metal conductive strip on the inner side of the insulating disc; it also includes a brush that electrically slides with the metal slip ring, and the brush is electrically connected to the positive pole of the power supply after passing through the galvanometer; the upper end of the micro-electric heating wire is fixed and electrically connected to the outer arc surface of the arc-shaped metal seesaw, and the lower end of the micro-electric heating wire is fixed and electrically connected to the counterweight iron column in a suspended state; a number of metal permanent magnet columns are fixedly installed at the bottom of the electrical box in the charging pile electrical box in the high-cold area, and there is a heating wire reel corresponding to the top of each metal permanent magnet column;

[0012] When the electric heating wire reel hangs all the wound micro-electric heating wire downward and leads it out, the notch on the insulating winding ring faces downward, and the counterweight iron column at the lower end of the plumb-shaped micro-electric heating wire is just attracted by the corresponding metal permanent magnetic column directly below and electrically connected; at this time, the plumb-shaped micro-electric heating wire pulls the arc-shaped metal seesaw downward under the action of the gravity of the counterweight iron column and the magnetic attraction of the metal permanent magnetic column, so that the arc-shaped metal seesaw overcomes the torsion spring and swings clockwise around the axis of the seesaw shaft, thereby driving the metal spring to swing clockwise around the axis of the seesaw shaft until it contacts and electrically connects to the metal contact rod, and at this time the arc-shaped metal seesaw extends to the lower right;

[0013] If the metal permanent magnet column is removed based on this state, the plumb-shaped micro-electric heating wire cannot move the arc-shaped metal seesaw to overcome the torsion of the torsion spring simply by the gravity of the counterweight iron column.

[0014] Furthermore, on the basis that the electric heating wire reel hangs all the wound micro-electric heating wire downward and leads it out, the electric heating wire reel rotates clockwise by degrees, and the arc-shaped metal seesaw extends to the lower left at this time. The pulling force of the upper end of the micro-electric heating wire on the arc-shaped metal seesaw tends to cause the arc-shaped metal seesaw to swing counterclockwise around the axis of the seesaw shaft, thereby driving the metal spring piece to separate from the metal contact rod; the metal permanent magnet column is grounded.

[0015] Furthermore, the working method of the micro-electric heating component system of the charging pile in the high-cold area, the process of a single vertical wire type heating unit entering the heating mode: the reel drive motor drives the electric heating wire reel to rotate slowly counterclockwise until the electric heating wire reel hangs all the wound micro-electric heating wire downward and pauses; if the electric heating wire reel has hung all the wound micro-electric heating wire downward and led it out, but the ammeter still does not detect the current, it is immediately determined that the counterweight iron column is not attracted by the metal permanent magnet column at this time, and the led-out micro-electric heating wire is entangled, and the controller immediately sends this judgment to the maintenance personnel.

[0016] Beneficial effects: The present invention effectively alleviates the risk of cracking of various components of the charging pile, inflexible action of the relay, performance degradation, etc. in extremely low temperature environments by coordinating the fixed micro-electric heating unit and the vertical wire type heating unit.

[0017] Since the plumb-shaped micro-electric heating wire runs through the entire inner cavity of the high-cold area charging pile electrical box from top to bottom and does not stick to the inner wall of the high-cold area charging pile electrical box, the plumb-shaped micro-electric heating wire can release heat evenly to the inner cavity of the high-cold area charging pile electrical box, thereby achieving the effect of evenly heating the inner cavity of the entire high-cold area charging pile electrical box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the external structure of the cabinet;

[0019] Figure 2 The diagram is a schematic diagram of the distribution of the heating units of the cabinet, in which the vertical wire type heating unit is in the heating state;

[0020] Figure 3 It is a schematic diagram of the heating status of several vertical wire type heating units in the cabinet;

[0021] Figure 4 This is the principle diagram of a single set of vertical wire type heating units in heating state;

[0022] Figure 5 It is a schematic diagram of a single set of vertical wire type heating units transforming from a non-heating state to a heating state;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the heating wire reel;

[0024] Figure 7This is a schematic diagram of the electric heating wire reel after the micro-electric heating wire is completely led out;

[0025] Figure 8 for Figure 7 A partial enlarged structural stereogram;

[0026] Fig. 9 This is a schematic diagram of the arc-shaped metal seesaw extending to the lower left after the heating wire coil rotates 90° clockwise under the heating state.

[0027] Fig.10 for Fig. 9 A partial enlarged schematic diagram shows that, based on the heating state, the heating wire reel rotates 90° clockwise, and the arc-shaped metal seesaw extends to the lower left. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] like Figures 1 to 10 The high-cold region charging pile micro-electric heating component system shown includes a high-cold region charging pile electrical box 22, such as Figure 2 Several fixed micro-electric heating units 24 and temperature sensors are discretely arranged in the electrical box 22 of the charging pile in the high-cold area. Several fixed micro-electric heating units 24 are distributed near several electrical components that require special antifreeze protection in the electrical box 22 of the charging pile in the high-cold area, so as to protect the electrical components that are vulnerable to damage under extremely low temperature conditions in the electrical box 22 of the charging pile in the high-cold area in a targeted manner; the fixed micro-electric heating units 24 all adopt a multi-layer structure; the innermost layer is a micro-current heating alloy wire, and the middle layer is an insulating interlayer, which uses special polymer materials to reduce the rapid loss of heat to the surrounding environment; the outermost layer is a heat dissipation layer, which has good heat dissipation performance and can dissipate heat in time. When working, the fixed micro-electric heating unit 24 is connected to the power supply, and the electrical energy is converted into thermal energy. The heat is conducted to the outer heat dissipation layer through the middle insulating and heat-insulating layer, while heating the key parts of the charging pile, it can also ensure the reasonable control of the component's own temperature; the control system intelligently adjusts the power of the micro-electric heating component according to the data fed back by the temperature sensor. When the temperature is low, the power output is increased to quickly raise the temperature; when the temperature reaches the set appropriate range, the power is reduced to keep the temperature stable and avoid overheating. At the same time, the control system can also reasonably adjust the heating strategy according to different charging stages and battery status.

[0030] When the ambient temperature is lower than -30℃, the overall temperature of the inner cavity of the high-cold area charging pile electrical box 22 enters an extremely low state, and the local temperature control effect of the fixed micro-electric heating unit 24 will be severely weakened or even fail due to the overall low temperature environment. At the same time, other electrical components of the high-cold area charging pile electrical box 22 are also prone to not working properly and performance being affected under extremely low temperature conditions. Therefore, on the basis of local key temperature control, the overall uniform temperature rise in the cabinet is required, and the following structure is designed:

[0031] like Figure 2 As shown, a plurality of vertical wire type heating units 23 are arranged in a top horizontal array in the electrical box 22 of the high-cold area charging pile.

[0032] The vertical wire heating unit 23 includes a reel drive motor 90 and a heating wire reel 5 fixedly installed on the top of the electrical box 22 of the charging pile in the high-cold area. The axis of the reel 9 synchronously connected to the output end of the reel drive motor / 0 is horizontal, and the end of the reel 9 is coaxially fixedly connected to the heating wire reel 5. The heating wire reel 5 can lead out and recover the downward hanging micro-electric heating wire 2; the heating wire reel 5 is made of insulating material as a whole, and the micro-electric heating wire 2 includes an electric heating alloy wire inner core extending along the length direction and a flexible insulating outer skin; Figure 6 , 7 As shown in FIG. 8 , the heating wire reel 5 includes two insulating discs 5 a arranged at a coaxial distance, the two insulating discs 5 a are integrally connected via a coaxial insulating winding ring 1 , and a winding ring groove 4 is formed between the two insulating discs 5 a .

[0033] like Figure 5 In the top figure, in the non-heating state, the micro-electric heating wire 2 is wound in the winding ring groove 4 outside the insulating winding ring 1 to form an electric heating wire winding body 2a; a part of the insulating winding ring 1 is provided with a notch 10, and a seesaw shaft 17 is provided at the notch 10, the seesaw shaft 17 is parallel to the axis of the electric heating wire winding disk 5, and the two ends of the seesaw shaft 17 are fixedly connected to the two insulating discs 5a, and the outer side of the seesaw shaft 17 is provided with a metal rotating sleeve 14 through a bearing rotation sleeve, and the metal rotating sleeve 14 One side is integrally connected with an arc-shaped metal seesaw 15 extending out of the notch 10, and the other side of the metal rotating sleeve 14 is integrally connected with a metal extending into the inner ring of the insulating winding ring 1 The metal spring 13 is a spring piece 13; one end of the metal rotating sleeve 14 is connected to a torsion spring 16. In a free state, the torsion spring 16 applies a counterclockwise torsion force to the metal rotating sleeve 14, so that the arc-shaped metal seesaw 15 is close to the outer circumference of the insulating winding ring 1; a metal contact rod 11 parallel to the seesaw axis 17 is arranged on the inner side of the notch 10 of the insulating winding ring 1. When the inner arc surface of the arc-shaped metal seesaw 15 is close to the outer circumference of the insulating winding ring 1, the metal contact rod 11 is separated from the metal spring piece 13. On this basis, the metal spring piece 13 swings clockwise around the axis of the seesaw axis 17 until it contacts and electrically connects to the metal contact rod 11.

[0034] The end of the metal contact rod 11 is fixedly connected to the insulating disc 5a; the metal contact rod 11 is electrically connected to the metal slip ring 120 on the insulating disc 5a through the metal conductive strip 12 on the inner side of the insulating disc 5a; it also includes a brush 20 that electrically slides with the metal slip ring 120, and the brush 20 is electrically connected to the positive pole of the power supply after passing through the ammeter 101.

[0035] The upper end of the micro-electric heating wire 2 is fixed and electrically connected to the outer arc surface of the arc-shaped metal seesaw 15, and the lower end of the micro-electric heating wire 2 is fixed and electrically connected to the counterweight iron column 3 in a suspended state; a plurality of metal permanent magnet columns 6 are fixedly installed at the bottom of the electrical box 25 in the electrical box 22 of the charging pile in the high-cold area, and each metal permanent magnet column 6 corresponds to a heating wire reel 5 above;

[0036] like Figure 4 , 7 , 8. When the electric heating wire reel 5 hangs all the wound micro-electric heating wire 2 downward and leads it out, the notch 10 on the insulating winding ring 1 faces downward, and the counterweight iron column 3 at the lower end of the plumb-shaped micro-electric heating wire 2 is just attracted by the corresponding metal permanent magnet column 6 directly below and electrically connected; at this time, the plumb-shaped micro-electric heating wire 2 pulls the arc-shaped metal seesaw 15 downward under the action of the gravity of the counterweight iron column 3 and the magnetic attraction of the metal permanent magnet column 6, so that the arc-shaped metal seesaw 15 overcomes the torsion spring 16 and swings clockwise around the axis of the seesaw shaft 17, thereby driving the metal spring 13 to swing clockwise around the axis of the seesaw shaft 17 until it contacts and electrically connects to the metal contact rod 11, and the arc-shaped metal seesaw 15 extends to the lower right at this time; if the metal permanent magnet column 6 is removed based on this state, the plumb-shaped micro-electric heating wire 2 cannot drive the arc-shaped metal seesaw 15 to overcome the torsion of the torsion spring 16 by the gravity of the counterweight iron column 3 alone.

[0037] On the basis that the electric heating wire reel 5 leads all the wound micro-electric heating wire 2 downwardly, the electric heating wire reel 5 rotates 90° clockwise, and the arc-shaped metal seesaw 15 extends to the lower left at this time. The pulling force of the upper end of the micro-electric heating wire 2 on the arc-shaped metal seesaw 15 tends to make the arc-shaped metal seesaw 15 swing counterclockwise around the axis of the seesaw shaft 17, thereby driving the metal spring 13 to separate from the metal contact rod 11;

[0038] The lower end of the metal permanent magnet column 6 is electrically connected to the metal shell of the high-cold area charging pile electrical box 22 through the metal base 7, which is equivalent to grounding; the negative pole of the power supply is electrically connected to the metal shell of the high-cold area charging pile electrical box 22, which is equivalent to grounding.

[0039] Working principle: Under normal circumstances, several fixed micro-electric heating units 24 are distributed near several electrical components that require special antifreeze protection in the high-cold area charging pile electrical box 22, and the key parts of the charging pile cabinet are heated, so as to protect the electrical components that are vulnerable to extremely low temperature conditions in the high-cold area charging pile electrical box 22; when the ambient temperature is lower than -30℃, the overall temperature of the inner cavity of the high-cold area charging pile electrical box 22 enters an extremely low state, and the local temperature control effect of the fixed micro-electric heating unit 24 will be severely weakened or even fail due to the overall low temperature environment. At the same time, other electrical components in the high-cold area charging pile electrical box 22 are also prone to not working properly and their performance is affected under extremely low temperature conditions. Therefore, on the basis of local key temperature control, the overall uniform temperature rise in the cabinet is also required; the specific operation is as follows:

[0040] The vertical wire type heating units 23 are controlled one by one to enter the heating mode. The process of a single vertical wire type heating unit 23 entering the heating mode is as follows:

[0041] It should be noted that the micro-electric heating wire 2 of this case is covered with a heat-conducting insulating skin.

[0042] Step 1: In the initial state, Figure 3 The micro-electric heating wire 2 on the electric heating wire reel 5 of the hanging wire type heating unit 23 is wound in the winding ring groove 4 outside the insulating winding ring 1 to form an electric heating wire winding body 2a. In this state, the metal spring 13 and the metal contact rod 11 are in a disengaged state. At the same time, since the micro-electric heating wire 2 is in a non-hanging state, it will not hinder the maintenance operations of the staff;

[0043] Step 2, control the reel drive motor 90 to drive the heating wire reel 5 to rotate slowly counterclockwise, so that the heating wire winding body 2a is gradually led downward under the gravity traction of the counterweight iron column 3, so that the hanging micro-electric heating wire 2 gradually extends downward and becomes longer, until the heating wire reel 5 pauses when all the wound micro-electric heating wire 2 is hung and led out downward. At this time, the notch 10 on the insulating reel 1 is just facing downward, and the counterweight iron column 3 at the lower end of the plumb-shaped micro-electric heating wire 2 is just attracted by the corresponding metal permanent magnet column 6 directly below and electrically connected; at this time, the plumb-shaped micro-electric heating wire 2 pulls the arc-shaped metal seesaw 15 downward under the action of the gravity of the counterweight iron column 3 and the magnetic attraction of the metal permanent magnet column 6, so that the arc-shaped metal seesaw The plate 15 overcomes the torsion spring 16 and swings clockwise around the axis of the seesaw shaft 17, thereby driving the metal spring 13 to swing clockwise around the axis of the seesaw shaft 17 until it contacts and electrically connects to the metal contact rod 11, so that the plumb-shaped micro-electric heating wire 2 is energized and releases heat, and then enters the heating mode of the vertical wire type heating unit 23; because the plumb-shaped micro-electric heating wire 2 runs through the entire inner cavity of the high-cold area charging pile electrical box 22 from top to bottom, and does not stick to the inner wall of the high-cold area charging pile electrical box 22, the plumb-shaped micro-electric heating wire 2 can evenly release heat to the inner cavity of the high-cold area charging pile electrical box 22, thereby achieving the effect of evenly heating the inner cavity of the entire high-cold area charging pile electrical box 22;

[0044] During the above process, if the counterweight iron column 3 at the lower end of the plumb-shaped micro-electric heating wire 2 shakes during its gradual descent due to earthquakes, external shocks, etc., causing the micro-electric heating wire 2 to become entangled with electrical components in the cabinet, the counterweight iron column 3 cannot descend to be attracted by the metal permanent magnet column 6 at the bottom. Even if the counterweight iron column 3 eventually contacts other metals, conductors, metal shells or electrical contacts in the cabinet, since the metal spring piece 13 and the metal contact rod 11 are in a disconnected state, a short circuit will not occur.

[0045] If in the above process, if the heating wire reel 5 has led out the wound micro-electric heating wire 2 in a completely downward hanging manner, but the ammeter 101 still does not detect the current, it is immediately determined that the counterweight iron column 3 is not attracted by the metal permanent magnet column 6 at this time, and the led-out micro-electric heating wire 2 is entangled, and the controller immediately sends this judgment to the maintenance personnel.

[0046] Since each plumb-shaped micro-electric heating wire 2 in the heating state passes through the upper and lower parts of the cabinet, a number of plumb-shaped micro-electric heating wires 2 hanging in the inner cavity of the charging pile electrical cabinet will interfere with the staff's unpacking, inspection and maintenance of the electrical cabinet, and will also cause problems such as entanglement. Therefore, under normal conditions and maintenance conditions, the plumb-shaped micro-electric heating wires 2 need to be recycled into each heating wire reel 5. The process of recycling the plumb-shaped micro-electric heating wires 2 into the heating wire reel 5 is as follows:

[0047] The control reel drive motor 90 drives the heating wire reel 5 to rotate slowly counterclockwise, so that the plumb-shaped micro-electric heating wire 2 gradually winds around the plumb-shaped micro-electric heating wire 2. After the heating wire reel 5 rotates 90° clockwise, the arc-shaped metal seesaw 15 now extends to the lower left, as shown in FIG. Fig. 9 and 10 As shown, the pulling force of the upper end of the micro-electric heating wire 2 on the arc-shaped metal seesaw 15 tends to make the arc-shaped metal seesaw 15 swing counterclockwise around the axis of the seesaw shaft 17, thereby driving the metal spring 13 to separate from the metal contact rod 11; the electric heating alloy wire in the micro-electric heating wire 2 is disconnected from the circuit, and then the heating wire reel 5 continues to rotate slowly counterclockwise, thereby continuing to retract the plumb-shaped micro-electric heating wire 2, thereby achieving the purpose of recovering the plumb-shaped micro-electric heating wire 2.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. The micro-electric heating component system for charging piles in cold areas is characterized by: The invention comprises an electrical box (22) for a charging pile in a high-cold region, wherein a plurality of fixed micro-electric heating units (24) and temperature sensors are discretely arranged in the electrical box (22) for the charging pile in a high-cold region, wherein the plurality of fixed micro-electric heating units (24) are located near a plurality of electrical components requiring special antifreeze protection in the electrical box (22) for the charging pile in a high-cold region; and a plurality of vertical wire-type heating units (23) are arranged in a top lateral array in the electrical box (22) for the charging pile in a high-cold region.

2. The micro-electric heating component system for charging piles in cold regions according to claim 1 is characterized by: The fixed micro-electric heating units (24) are all multi-layer structures; the innermost layer is a micro-current heating alloy wire, the middle layer is an insulating layer; and the outermost layer is a heat dissipation layer.

3. The micro-electric heating component system for charging piles in cold regions according to claim 1 is characterized by: The hanging wire type heating unit (23) comprises a reel drive motor (90) fixedly mounted on the top of an electrical box (22) of a charging pile in a high-cold area, and a heating wire reel (5); the end of the reel (9) is coaxially connected to the heating wire reel (5); and the heating wire reel (5) can lead out and recover the downward hanging micro-electric heating wire (2).

4. The micro-electric heating component system for charging piles in cold regions according to claim 3 is characterized by: The micro-electric heating wire (2) comprises an electric heating alloy wire inner core extending along the length direction and a flexible insulating outer sheath.

5. The micro-electric heating component system for charging piles in cold regions according to claim 4 is characterized by: The heating wire reel (5) comprises two insulating discs (5a) arranged at a coaxial distance, the two insulating discs (5a) being integrally connected via a coaxial insulating winding ring (1), and a winding ring groove (4) being formed between the two insulating discs (5a). In a non-heating state, the micro-electric heating wire (2) is wound in a winding ring groove (4) outside the insulating winding ring (1) to form an electric heating wire winding body (2a).

6. The micro-electric heating component system for charging piles in cold regions according to claim 5 is characterized by: A notch (10) is provided at a part of the insulating winding ring (1), and a seesaw shaft (17) is provided at the notch (10). Insulating discs (5a) are fixed at both ends of the seesaw shaft (17). The seesaw shaft (17) is rotatably sleeved on a metal rotating sleeve (14) through a bearing. An arc-shaped metal seesaw (15) extending out of the notch (10) is integrally connected to one side of the metal rotating sleeve (14), and a metal spring (13) extending into the inner ring of the insulating winding ring (1) is integrally connected to the other side of the metal rotating sleeve (14). A torsion spring (16) is connected to one end of the metal rotating sleeve (14). In a free state, the torsion spring (16) applies a counterclockwise torsion force to the metal rotating sleeve (14), so that the arc-shaped metal seesaw (15) is in close contact with the outer peripheral surface of the insulating winding ring (1); a metal contact rod (11) is arranged inside the notch (10) of the insulating winding ring (1); when the inner arc surface of the arc-shaped metal seesaw (15) is in close contact with the outer peripheral surface of the insulating winding ring (1), the metal contact rod (11) is separated from the metal spring (13), and on this basis, the metal spring (13) swings clockwise around the axis of the seesaw shaft (17) until it contacts and electrically connects with the metal contact rod (11).

7. The micro-electric heating component system for charging piles in cold regions according to claim 6 is characterized by: The end of the metal contact rod (11) is fixedly connected to the insulating disc (5a); the metal contact rod (11) is electrically connected to the metal slip ring (120) on the insulating disc (5a) through the metal conductive strip (12) on the inner side of the insulating disc (5a); it also includes a brush (20) electrically slidingly matched with the metal slip ring (120), and the brush (20) is electrically connected to the positive pole of the power supply after passing through the galvanometer (101); the upper end of the micro-electric heating wire (2) is fixed and electrically connected to the outer arc surface of the arc-shaped metal seesaw (15), and the lower end of the micro-electric heating wire (2) is fixed and electrically connected to the counterweight iron column (3) in a suspended state; a plurality of metal permanent magnet columns (6) are fixedly installed at the bottom of the electrical box (25) in the high-cold area charging pile electrical box (22), and each metal permanent magnet column (6) corresponds to an electric heating wire reel (5) above; When the electric heating wire reel (5) leads all the wound micro-electric heating wire (2) downwardly, the notch (10) on the insulating winding ring (1) faces downward, and the counterweight iron column (3) at the lower end of the plumb-shaped micro-electric heating wire (2) is just attracted by and electrically connected to the corresponding metal permanent magnet column (6) directly below; at this time, the plumb-shaped micro-electric heating wire (2) pulls the arc-shaped metal seesaw (15) downward under the action of the gravity of the counterweight iron column (3) and the magnetic attraction of the metal permanent magnet column (6), so that the arc-shaped metal seesaw (15) overcomes the torsion spring (16) and swings clockwise around the axis of the seesaw shaft (17), thereby driving the metal spring sheet (13) to swing clockwise around the axis of the seesaw shaft (17) until it contacts and electrically connects to the metal contact rod (11), and at this time, the arc-shaped metal seesaw (15) extends to the lower right; If the metal permanent magnet column (6) is removed in this state, the plumb-shaped micro-electric heating wire (2) cannot move the arc-shaped metal seesaw (15) to overcome the torsion of the torsion spring (16) by the gravity of the counterweight iron column (3) alone.

8. The micro-electric heating component system for charging piles in cold regions according to claim 7 is characterized by: On the basis that the electric heating wire reel (5) leads out all the wound micro-electric heating wire (2) by hanging downward, the electric heating wire reel (5) rotates 90° clockwise, and the arc-shaped metal seesaw (15) extends to the lower left at this time. The pulling force of the upper end of the micro-electric heating wire (2) on the arc-shaped metal seesaw (15) tends to cause the arc-shaped metal seesaw (15) to swing counterclockwise around the axis of the seesaw shaft (17), thereby driving the metal spring (13) to separate from the metal contact rod (11); the metal permanent magnet column (6) is grounded.

9. The working method of the micro-electric heating component system for charging piles in cold regions according to claim 8 is characterized by: The process of a single hanging wire type heating unit (23) entering the heating mode: the reel drive motor (90) drives the heating wire reel (5) to rotate slowly counterclockwise until the heating wire reel (5) has completely hung the wound micro-electric heating wire (2) downward and led out, and then pauses. If the heating wire reel (5) has completely hung the wound micro-electric heating wire (2) downward and led out, but the galvanometer (101) still does not detect the current, it is immediately determined that the counterweight iron column (3) is not attracted by the metal permanent magnet column (6) at this time, and the led micro-electric heating wire (2) is entangled. At this time, the controller immediately sends this judgment to the maintenance personnel.

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