A power cable for charging piles

Abstract

The application relates to a power cable for a charging pile applied to the field of cables, wherein a liquid storage pipe and a liquid guide pipe with heat-conducting liquid are arranged in the cable body near the charging head of the charging pile, the liquid guide pipe is communicated with a liquid tank outside the cable body, in use, the heat generated by multiple cable cores is transferred to the liquid storage pipe, the heat-conducting liquid is gradually heated, on one hand, the temperature of the cable cores near the region is lowered, on the other hand, the monitoring data of the temperature sensor in the liquid tank also changes, when the heat generation of the cable cores gradually becomes serious, the temperature of the heat-conducting liquid reaches a set value, the temperature sensor sends a charging warning to the charging pile system, monitoring personnel can timely intervene in charging, when the temperature sensor is invalid, the temperature change of the visual inspection rod and the monitoring of the visual inspection rod by the image collector enable the monitoring personnel to timely and effectively judge the temperature of the heat-conducting liquid, and further judge the temperature rise of the cable body.

Description

Technical Field

[0001] This invention relates to a power cable, and more particularly to a power cable for charging piles used in the field of cables. Background Technology

[0002] With the increasing popularity of new energy vehicles, the requirements for charging stations are also becoming more stringent. To further reduce charging time, high-power charging stations are being deployed both domestically and internationally. However, when using high-power charging, the energy transmitted per unit time increases, which can easily lead to severe overheating of the charging station cables during use.

[0003] Chinese patent CN118231049B discloses a charging pile cable, including a cable body and a charging head. The cable body contains a positive conductor and a negative conductor, surrounded by an insulation layer and a cooling layer. A flow channel for coolant is formed between the cooling layer and the insulation layer. The charging head has a positive cavity, a negative cavity, and an isolation cavity. The isolation cavity is connected to the positive cavity and the negative cavity. A driving component is provided inside the charging head to intermittently change the space within the isolation cavity. This design reduces the temperature of the positive and negative conductors, thereby controlling the temperature of the cable body and preventing safety hazards caused by excessively high cable body temperatures. During charging, the cable body temperature is less likely to affect the charging process, thus posing no safety threat to the user.

[0004] Chinese patent CN109754895B discloses an air-cooled cable and its device for charging piles. The air-cooled cable includes a power line, which comprises a stranded conductor, an insulating tape layer, a braided layer, and an insulating layer arranged sequentially from the inside out. The stranded conductor is made of copper wire and contains a coarse vent tube and several fine vent tubes. The air-cooled cable device includes the air-cooled cable for charging piles, power line terminals, and power line connectors. The power line terminals are connected to both ends of the power line, connecting the coarse vent tube and the fine vent tubes to form a cooling circuit. This air-cooled cable and its device for charging piles can achieve heat dissipation and cooling of the cable through cooling gas, eliminating the danger of short circuits caused by cooling channel leakage and removing safety hazards. Furthermore, the cooling circuit is integrated within a single power line, resulting in better heat dissipation and cooling performance.

[0005] However, existing charging pile cables do not have the function of self-temperature detection, especially in the area near the connection with the charging head of the charging pile. Due to the contact resistance at the joint, the heat generation is more serious than in other areas. If it is difficult to detect and deal with in time, the overheating of the cable can easily cause a charging fire. Summary of the Invention

[0006] The technical problem that this invention aims to solve in view of the above-mentioned prior art is that the charging pile cable generates severe heat during use, which is difficult to detect in time and can easily lead to charging fire accidents.

[0007] To solve the above problems, the present invention provides a power cable for charging piles, including a cable body, the cable body including a filling layer, a sheath and multiple cable cores, the sheath is fixedly covered outside the filling layer, the filling layer is fixedly covered outside the multiple cable cores, a pair of inner covers are fitted on the side of the cable body near the charging gun of the charging pile, a disconnection zone is opened on both the sheath and the filling layer, the pair of inner covers are fitted outside the disconnection zone, a liquid tank is fixedly connected to the inner wall of one of the inner covers, a hose communicating with the inner cavity of the liquid tank is fixedly connected to the outer end of the liquid tank, and a connecting pipe is fixedly connected to the end of the hose away from the liquid tank.

[0008] A liquid storage tube is fixedly connected inside the filling layer on the side near the charging gun of the charging pile. The liquid storage tube is filled with heat-conducting liquid. A liquid guide tube is fixedly connected to the liquid storage tube. The end of the liquid guide tube near the charging gun of the charging pile extends into the heat-conducting liquid, and the end of the liquid guide tube away from the charging gun of the charging pile extends to the outside. The connecting pipe is threadedly connected to the liquid guide tube. The liquid tank, hose, connecting pipe and liquid guide tube are also filled with heat-conducting liquid. A temperature sensor is fixedly connected to the liquid tank, and the temperature sensing end of the temperature sensor is fixedly extended into the heat-conducting liquid inside the liquid tank.

[0009] As a further supplement to this application, the outer end of the liquid tank is fixedly connected to a liquid filling pipe that communicates with its inner cavity. The liquid filling pipe is fixedly inserted through the inner cover and extends to its outer side. The outer end of the liquid filling pipe is threadedly connected to a sealing sleeve.

[0010] As a further supplement to this application, the outer end of the inner cover is fixedly connected to a pair of perforated plates, which are connected to each other by fasteners.

[0011] As another improvement of this application, multiple inspection rods are fixedly connected to the heat transfer fluid, with one end of the inspection rod extending into the heat transfer fluid inside the tank and the other end extending to the outside of the tank.

[0012] As a further improvement to this application, an outer cover is also provided on the outside of the cable body, and the outer cover is placed on the outside of the inner cover. An image acquisition device is fixedly connected to the inner wall of one of the outer covers, and the lens of the image acquisition device is facing the inspection bar.

[0013] As a further improvement to this application, both ends of the inner cover are provided with threaded grooves, and both ends of the outer cover are provided with threaded holes, with bolts threadedly connected between the threaded grooves and the threaded holes.

[0014] As a further improvement to this application, the inner cover is made of transparent material and the outer cover is made of opaque material.

[0015] As a further improvement to this application, the inspection rod includes a heat-conducting rod and a color-changing coating applied to the outer end of the heat-conducting rod. The color-changing coating is located on the outside of the liquid tank, and the color-changing temperatures of the multiple color-changing coatings are all different.

[0016] As a further improvement to this application, both the inner and outer covers include a conductor shielding layer, an outer insulating layer, and a rigid outer layer arranged sequentially from the inside out.

[0017] A method for installing an inner and outer casing of a power cable for a charging pile includes the following steps:

[0018] S1. Select an inner cover with a liquid tank and an inner cover without a liquid tank. First, manually tighten the connecting pipe to the outside of the liquid guide pipe port. Then, fit the pair of inner covers together and put them on the outside of the disconnection area of ​​the sheath. Fix the pair of inner covers to the outside of the cable body through the fasteners and the connection of the perforated plate.

[0019] S2. Inject heat transfer fluid into the liquid tank through the filling pipe. The heat transfer fluid gradually fills the inside of the liquid tank, hose, liquid transfer pipe and storage pipe. Then, seal the opening of the filling pipe with a sealing sleeve.

[0020] S3. Select an outer cover with an image acquisition device and an outer cover without an image acquisition device. Place the outer cover over the outer side of the inner cover and position the outer cover with the image acquisition device outside the inner cover with the liquid tank. Fix the inner cover and outer cover with bolts to fix the outer cover to the outer end of the cable body.

[0021] In summary, this application involves installing a storage pipe and a guide pipe containing heat-conducting fluid inside the cable body near the charging head of the charging pile, and connecting the guide pipe to a liquid tank on the outside of the cable body. During use, the heat generated by multiple cable cores is transferred to the storage pipe, causing the heat-conducting fluid to gradually absorb heat and rise in temperature. This achieves cooling of the cable cores in the vicinity. On the other hand, as the heat-conducting fluid absorbs heat, the monitoring data of the temperature sensor inside the liquid tank also changes. When the cable core heating continues and gradually becomes more severe, causing the temperature of the heat-conducting fluid to reach a set value, the temperature sensor will issue a charging warning to the charging pile system, allowing monitoring personnel to intervene in charging in a timely manner. When the temperature sensor fails, the temperature change of the inspection rod and the monitoring of the inspection rod by the image acquisition device allow the monitoring personnel to observe the color change of the inspection rod, which can also effectively determine the temperature of the heat-conducting fluid and thus the temperature rise of the cable body. Attached Figure Description

[0022] Figure 1 These are perspective views of the first and second embodiments of this application;

[0023] Figure 2 For the three-dimensional disassembly in the first and second embodiments of this application Figure 1 ;

[0024] Figure 3 These are partial perspective views of the first and second embodiments of this application;

[0025] Figure 4 For the three-dimensional disassembly in the first and second embodiments of this application Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the side structure during disassembly in the first and second embodiments of this application;

[0027] Figure 6 This is a schematic diagram of the side structure when a heat-conducting liquid is added in the first and second embodiments of this application;

[0028] Figure 7 This is a schematic diagram of the side structure after installation in the first and second embodiments of this application;

[0029] Figure 8 This is a front structural diagram of the cable body with a liquid storage tube in the first and second embodiments of this application;

[0030] Figure 9 This is a schematic diagram of the front structure after installation in the second embodiment of this application.

[0031] Explanation of the labels in the diagram:

[0032] 1. Cable body, 101. Cable core, 1011. Conductor, 1012. Inner insulation layer, 1013. Inner shield, 102. Sheath, 103. Filling layer, 2. Inner cover, 201. Screw groove, 3. Outer cover, 301. Screw hole, 4. Image acquisition device, 5. Liquid tank, 6. Hoses, 7. Connecting pipe, 8. Perforated plate, 9. Liquid filling pipe, 10. Liquid storage pipe, 11. Liquid guiding pipe, 12. Heat transfer fluid, 13. Inspection rod. Detailed Implementation

[0033] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] Implementation method 1:

[0035] This invention provides a power cable for charging piles; please refer to [link / reference]. Figure 1 Including cable body 1, combined Figure 4 and Figure 5 As shown, the cable body 1 includes a filling layer 103, a sheath 102, and multiple cable cores 101. The sheath 102 is fixedly wrapped around the outside of the filling layer 103, and the filling layer 103 is fixedly wrapped around the outside of the multiple cable cores 101. The above is the existing cable structure.

[0036] Please see Figure 2 , Figure 3 and Figure 4A pair of inner covers 2 are fitted on the side of the cable body 1 closest to the charging gun of the charging pile. Both the sheath 102 and the filling layer 103 have disconnection areas. The disconnection area is the area where the cable core 101 is exposed. The pair of inner covers 2 are fitted outside the disconnection area. The two ends of the inner covers 2 are provided with semi-circular grooves that match the outer surface of the sheath 102. When in use, the inner covers 2 and the sheath 102 form a contact seal to achieve the wrapping of the disconnection area. A liquid tank 5 is fixedly connected to the inner wall of one of the inner covers 2. A hose 6 communicating with its inner cavity is fixedly connected to the outer end of the liquid tank 5. A connecting pipe 7 is fixedly connected to the end of the hose 6 away from the liquid tank 5.

[0037] Please see Figure 4 and Figure 5 A liquid storage tube 10 is fixedly connected inside the filling layer 103 on the side near the charging gun of the charging pile. Multiple cable cores 101 are evenly distributed on the outside of the liquid storage tube 10 and are close to each other. Figure 6 and Figure 7 As shown, the inside of the liquid storage tube 10 is filled with heat-conducting liquid 12. A liquid guide tube 11 is fixedly connected to the liquid storage tube 10. The end of the liquid guide tube 11 near the charging gun of the charging pile extends into the inside of the heat-conducting liquid 12, and the end of the liquid guide tube 11 away from the charging gun of the charging pile extends to the outside. The connecting pipe 7 is threadedly connected to the liquid guide tube 11. Before fixing the inner cover 2, the flexible bending characteristics of the hose 6 make it easy to connect the connecting pipe 7 to the liquid guide tube 11, and also facilitate the disassembly of the inner cover 2 later. The inside of the liquid tank 5, hose 6, connecting pipe 7 and liquid guide tube 11 are also filled with heat-conducting liquid 12. A temperature sensor is fixedly connected to the liquid tank 5. The temperature sensor is not shown in the figure. It can be set at the outer end or inside the liquid tank 5, as long as the temperature sensing end of the temperature sensor is fixedly extended into the heat-conducting liquid 12 inside the liquid tank 5, so as to facilitate monitoring the temperature change of the heat-conducting liquid 12. The heat-conducting liquid 12 is a liquid with high thermal conductivity, such as pure water or liquid metal.

[0038] The outer end of the liquid tank 5 is fixedly connected to a liquid filling pipe 9 that communicates with its inner cavity. The liquid filling pipe 9 is fixedly connected through the inner cover 2 and extends to its outer side. The outer end of the liquid filling pipe 9 is threaded with a sealing sleeve. In the initial state, the liquid storage pipe 10 is not filled with heat transfer fluid 12. After the inner cover 2 is installed on the outside of the protective cover 102, the heat transfer fluid 12 can be conveniently injected into the liquid tank 5, the liquid storage pipe 10 and the liquid guide pipe 11 through the liquid filling pipe 9. When the heat transfer fluid 12 gradually fills to the opening of the liquid filling pipe 9, the injection of heat transfer fluid 12 is stopped and the opening of the liquid filling pipe 9 is sealed with a sealing sleeve.

[0039] A pair of perforated plates 8 are fixedly connected to the outer end of the inner cover 2. The pair of perforated plates 8 are connected by fasteners, which include screws and a pair of nuts. The screws are inserted into the perforated plates 8 on the pair of inner covers 2, and the pair of nuts are threaded to the upper and lower ends of the screws respectively, thus fixing the pair of perforated plates 8. A sealing ring is fixedly connected to the inner wall of the semi-circular groove on the inner cover 2 that matches the sheath 102. After the pair of inner covers 2 are fixed, the sealing ring can be tightly fitted on the outer end of the sheath 102, and the pair of inner covers 2 are stabilized by friction.

[0040] The installation method for inner cover 2 includes the following steps:

[0041] S1, please refer to Figure 4 Select an inner cover 2 with a liquid tank 5 and an inner cover 2 without a liquid tank 5. First, manually tighten the connector 7 to the outer end of the liquid guide tube 11. Then, fit the pair of inner covers 2 together on the outside of the disconnection area of ​​the sheath 102. Fix the pair of inner covers 2 to the outer end of the cable body 1 through the connection of fasteners and perforated plate 8.

[0042] S2, please refer to Figure 6 Heat transfer fluid 12 is injected into the liquid tank 5 through the liquid filling pipe 9. The heat transfer fluid 12 gradually fills the liquid tank 5, hose 6, liquid transfer pipe 11 and liquid storage pipe 10. Then the opening of the liquid filling pipe 9 is sealed with a sealing sleeve.

[0043] During the use of the cable body 1, the cable core 101 needs to carry current for data transmission for a long time, which will inevitably generate heat. Due to the sheath 102 and the filling layer 103, the heat of the cable core 101 is difficult to dissipate to the outside in a timely manner. Based on this problem, this application provides an effective heat monitoring method through the inner cover 2 and its related structures. The specific principle is as follows:

[0044] The heat generated by multiple cable cores 101 accumulates in the filling layer 103 and is quickly transferred to the liquid storage pipe 10, causing the heat-conducting liquid 12 to gradually absorb heat and rise in temperature. On the one hand, this cools down the cable cores 101 in the vicinity of the area. On the other hand, as the heat-conducting liquid 12 absorbs heat, the monitoring data of the temperature sensor on the heat-conducting liquid 12 also changes. When the heating of the cable cores 101 continues and gradually becomes more severe, causing the temperature of the heat-conducting liquid 12 to reach the set value, the temperature sensor will issue a charging warning to the charging pile system, so that the monitoring personnel can intervene in time to the charging head that is charging (such as pausing charging). In addition, in practice, due to the existence of contact resistance at the joint or unexpected situations such as poor contact, the heating at the connection between the charging head of the charging pile and the cable body 1 is more obvious than other parts of the cable body 1. Therefore, this application sets the inner cover 2 at the position of the cable body 1 close to the charging head.

[0045] When the temperature sensor sensitivity decreases or fails, the temperature sensor can be replaced by disassembling and replacing the inner cover 2. Before replacing the inner cover 2, the best operation is to first use a suction pump to extract the heat transfer liquid 12 from the liquid tank 5 and the liquid storage pipe 10.

[0046] Please see Figure 8 The cable core 101 includes an innermost conductor 1011, an inner shielding layer 1013 on the outside of the conductor 1011, an inner insulation layer 1012 on the outside of the inner shielding layer 1013, and another inner shielding layer 1013 on the outside of the inner insulation layer 1012. The inner insulation layer 1012 and the inner shielding layer 1013 respectively provide electromagnetic interference resistance and insulation for the conductor 1011. This is the structural configuration of the conductor and its outer layer in existing cables. In addition, the inner cover 2 includes a conductor shielding layer, an outer insulation layer and a rigid outer layer arranged sequentially from the inside to the outside. Since there is no sheath 102 in the disconnection area, the conductor shielding layer and the outer insulation layer carried by the inner cover 2 provide electromagnetic interference resistance and insulation for the cable core 101, so that the inner cover 2 has the same protective function as the sheath 102 and is less likely to affect the normal use of the cable body 1.

[0047] The second implementation method:

[0048] This embodiment, based on embodiment 1, adds the following to provide a second means of monitoring the heating status of the cable body 1 in the event of a decrease in the sensitivity or failure of the temperature sensor. Details are as follows: Please refer to... Figure 4 Multiple inspection rods 13 are fixedly connected to the heat-conducting liquid 12. One end of the inspection rod 13 extends into the heat-conducting liquid 12 inside the liquid tank 5, and the other end extends to the outside of the liquid tank 5. The inspection rod 13 includes a heat-conducting rod and a color-changing coating applied to the outer end of the heat-conducting rod. The color-changing coating is located on the outside of the liquid tank 5. The color-changing coating is made of thermosensitive pigment and has reversible temperature-sensitive color-changing characteristics. The color-changing temperatures of the multiple color-changing coatings are different. For example, if the color-changing temperatures are 16℃, 21℃, 31℃, and 38℃, they will change color at the corresponding temperatures. For example, a certain color-changing coating is colorless above 16℃ and yellow below 16℃. Those skilled in the art can set the specific temperature according to the actual heating of the cable core 101. The lowest color-changing temperature is preferably the normal temperature when the cable core 101 is not heating up, and the highest color-changing temperature is preferably the temperature when the cable core 101 is severely heating up.

[0049] Please see Figure 7 and Figure 9The cable body 1 is also fitted with an outer cover 3, which is fitted over the inner cover 2. An image acquisition device 4 is fixedly connected to the inner wall of one of the outer covers 3. The lens of the image acquisition device 4 faces the inspection rod 13. The image acquisition device 4 uses a small camera. The inner cover 2 is made of transparent material to allow the image acquisition device 4 to observe the color changes of the color-changing coating on the inspection rod 13. The outer cover 3 is made of opaque material. Because the color-changing coating made of thermosensitive pigments has poor light resistance, the outer cover 3 effectively improves its service life. Figure 2 , Figure 3 and Figure 7 Both ends of the inner cover 2 are provided with screw grooves 201, and both ends of the outer cover 3 are provided with screw holes 301. Bolts are threadedly connected between the screw grooves 201 and the screw holes 301.

[0050] After completing step S2 of the first embodiment, the following step S3 is performed: Select an outer cover 3 with an image acquisition device 4 and an outer cover 3 without an image acquisition device 4, put a pair of outer covers 3 on the outside of a pair of inner covers 2, and place the outer cover 3 with the image acquisition device 4 on the outside of the inner cover 2 with the liquid tank 5, and fix the inner cover 2 and the outer cover 3 with bolts, so that a pair of outer covers 3 are fixed to the outer end of the cable body 1, that is, the outer cover 3 and the inner cover 2 are detachably connected.

[0051] The monitoring principle of the heating status of the cable body 1 based on the above structure: Please refer to... Figure 9 Based on the heat absorption and temperature rise of the heat transfer fluid 12, the multiple color-changing coatings on the surface of the inspection rod 13 will gradually change color. At the same time, the image acquisition device 4 acquires images of them. By comprehensively observing the color changes of each color-changing coating, the personnel can effectively determine the temperature of the heat transfer fluid 12. For example, if there are four inspection rods 13, and the color-changing coatings on the surface of the four inspection rods 13 are coating A with a color-changing temperature of 16℃, coating B with a color-changing temperature of 21℃, coating C with a color-changing temperature of 31℃, and coating D with a color-changing temperature of 38℃, when it is observed that coatings A, B, and C all show color changes, while coating D does not show color changes, it can be determined to a certain extent that the temperature of the heat transfer fluid 12 is between 31-38℃.

[0052] In addition, the outer cover 3 also includes a conductor shielding layer, an outer insulation layer and a rigid outer layer arranged sequentially from the inside to the outside, which further provides electromagnetic interference resistance and insulation performance for the cable core 101 in the disconnection area based on the inner cover 2.

[0053] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A power cable for a charging pile, comprising a cable body (1), the cable body (1) comprising a filling layer (103), a sheath (102) and a plurality of cable cores (101), the sheath (102) being fixedly wrapped around the outside of the filling layer (103), and the filling layer (103) being fixedly wrapped around the outside of the plurality of cable cores (101), characterized in that: The cable body (1) is fitted with a pair of inner covers (2) on the side near the charging gun of the charging pile. The sheath (102) and the filling layer (103) are both provided with disconnection areas. The pair of inner covers (2) are fitted outside the disconnection areas. One of the inner covers (2) is fixedly connected to a liquid tank (5) on its inner wall. The outer end of the liquid tank (5) is fixedly connected to a hose (6) communicating with its inner cavity. The end of the hose (6) away from the liquid tank (5) is fixedly connected to a connector (7). A liquid storage tube (10) is fixedly connected inside the filling layer (103) near the charging gun of the charging pile. The liquid storage tube (10) is filled with heat-conducting liquid (12). A liquid guide tube (11) is fixedly connected to the liquid storage tube (10). The end of the liquid guide tube (11) near the charging gun of the charging pile extends into the heat-conducting liquid (12), and the end of the liquid guide tube (11) away from the charging gun of the charging pile extends to the outside. The connecting pipe (7) is threadedly connected to the liquid guide tube (11). The liquid tank (5), hose (6), connecting pipe (7) and liquid guide tube (11) are also filled with heat-conducting liquid (12). A temperature sensor is fixedly connected to the liquid tank (5), and the temperature sensing end of the temperature sensor is fixedly extended into the heat-conducting liquid (12) inside the liquid tank (5).

2. The power cable for a charging pile according to claim 1, characterized in that: The outer end of the liquid tank (5) is fixedly connected to a liquid filling pipe (9) that communicates with its inner cavity. The liquid filling pipe (9) is fixedly connected through the inner cover (2) and extends to its outer side. The outer end of the liquid filling pipe (9) is threadedly connected to a sealing sleeve.

3. The power cable for a charging pile according to claim 2, characterized in that: The outer end of the inner cover (2) is fixedly connected to a pair of perforated plates (8), and the pair of perforated plates (8) are connected by fasteners.

4. The power cable for a charging pile according to claim 3, characterized in that: Multiple inspection rods (13) are fixedly connected to the heat-conducting liquid (12). One end of the inspection rod (13) extends into the heat-conducting liquid (12) inside the liquid tank (5), and the other end of the inspection rod (13) extends to the outside of the liquid tank (5).

5. A power cable for a charging pile according to claim 4, characterized in that: The cable body (1) is also fitted with an outer cover (3), and the outer cover (3) is fitted on the outside of the inner cover (2). An image acquisition device (4) is fixedly connected to the inner wall of one of the outer covers (3), and the lens of the image acquisition device (4) faces the inspection rod (13).

6. A power cable for a charging pile according to claim 5, characterized in that: The inner cover (2) has screw grooves (201) at both ends, and the outer cover (3) has screw holes (301) at both ends. Bolts are threadedly connected between the screw grooves (201) and the screw holes (301).

7. A power cable for a charging pile according to claim 5, characterized in that: The inner cover (2) is made of transparent material, and the outer cover (3) is made of opaque material.

8. A power cable for a charging pile according to claim 4, characterized in that: The inspection rod (13) includes a heat-conducting rod and a color-changing coating applied to the outer end of the heat-conducting rod. The color-changing coating is located on the outside of the liquid tank (5), and the color-changing temperatures of the multiple color-changing coatings are different.

9. A power cable for a charging pile according to claim 1, characterized in that: Both the inner cover (2) and the outer cover (3) include a conductor shielding layer, an outer insulation layer and a rigid outer layer arranged sequentially from the inside to the outside.

10. A power cable for a charging pile according to claim 6, characterized in that: The installation method of the inner cover (2) and the outer cover (3) includes the following steps: S1. Select an inner cover (2) with a liquid tank (5) and an inner cover (2) without a liquid tank (5). First, manually tighten the connecting pipe (7) to the outside of the liquid guide pipe (11) port. Then, fit the pair of inner covers (2) together on the outside of the disconnection area of ​​the sheath (102). Fix the pair of inner covers (2) to the outside of the cable body (1) through the connection of fasteners and perforated plate (8). S2. Heat transfer fluid (12) is injected into the liquid tank (5) through the liquid filling pipe (9). The heat transfer fluid (12) gradually fills the liquid tank (5), hose (6), liquid transfer pipe (11) and storage pipe (10). Then, the opening of the liquid filling pipe (9) is sealed with a sealing sleeve. S3. Select an outer cover (3) with an image acquisition device (4) and an outer cover (3) without an image acquisition device (4). Place the outer cover (3) on the outside of the inner cover (2) and make the outer cover (3) with the image acquisition device (4) located outside the inner cover (2) with the liquid tank (5). Fix the inner cover (2) and the outer cover (3) with bolts so that the outer cover (3) is fixed to the outer end of the cable body (1).

Images