Photovoltaic branch cable

Abstract

The utility model provides a photovoltaic branch cable, which relates to the technical field of branch cables. The photovoltaic branch cable includes a main line, the main line includes a first conductor and a first insulating layer, the first conductor includes a main body; at least one branch line, the branch line includes a second conductor and a second insulating layer, the end of the second conductor is arranged to be connected to the main body of the first conductor, and the end of the second insulating layer is connected to the end of the first insulating layer; at least one injection-molded shell corresponding to each branch line is sleeved on the circumference of the connection between the first insulating layer and the second insulating layer; at least one elastic component, one end of which is connected to the main line or the injection-molded shell, and the other end is connected to the corresponding branch line or the injection-molded shell, so as to provide support for the branch line when the branch line is bent in a direction close to the main line, and a preset bending angle is set between the branch line and the main line. The photovoltaic branch cable of the utility model can realize the angle adjustment of the branch line and the main line, and at the same time avoid the breakage of the insulating layer between the main line and the branch line.

Description

Technical Field

[0001] The utility model belongs to the technical field of branch cables, and in particular relates to a photovoltaic branch cable. Background Art

[0002] New energy photovoltaic cables are suitable for the transmission of electric energy in solar photovoltaic modules. Currently, all photovoltaic cables on the market are single photovoltaic cables. Each solar panel must be connected to a photovoltaic cable for DC power transmission. A solar group consists of multiple single solar panels, and the photovoltaic cables of each solar group are eventually combined as a whole. The photovoltaic cables of multiple solar groups are connected in parallel to the combiner box. The output current of each combiner box is connected to the distribution cabinet or the inverter to convert DC power into AC power and finally connect to the grid for transmission.

[0003] However, when the photovoltaic cable is a single cable, during the actual installation and laying process, each solar panel needs to be individually connected to the photovoltaic cable for power transmission, which makes the above-mentioned laying method cumbersome and consumes a lot of manpower and material resources. In the prior art, multiple branch cables are arranged in the photovoltaic cable to improve the laying efficiency of the photovoltaic cable. Since the angle between the branch cable and the main cable in the prior art is fixed, the branch angle cannot be adjusted according to the actual position of the solar panel, thereby affecting the laying efficiency of the branch cable. In addition, if the branch cable is rigidly stretched, the insulation layer connection between the branch cable and the main cable is prone to cracking, thereby affecting the safety of the photovoltaic cable. Utility Model Content

[0004] One purpose of the utility model is to provide a photovoltaic branch cable to solve the technical problems in the prior art that the branch line of the photovoltaic branch cable cannot adjust the angle and the insulation layer is prone to cracking.

[0005] Another purpose of the utility model is to improve the convenience of using the photovoltaic branch cable.

[0006] According to the purpose of the utility model, the utility model provides a photovoltaic branch cable, including:

[0007] A main line, comprising a first conductor and a first insulating layer, wherein the first insulating layer is sleeved on a circumferential side of the first conductor, and the first conductor comprises a main body;

[0008] At least one branch line, each of the branch lines comprising a second conductor and a second insulating layer, the second insulating layer being sleeved on the circumference of the second conductor, and the end of each second conductor being arranged to be fixedly connected to the main body of the first conductor, and the end of each second insulating layer being fixedly connected to the end of the first insulating layer;

[0009] At least one injection-molded housing is provided corresponding to each branch line and is sleeved on the peripheral side of the connection between the first insulating layer and the second insulating layer;

[0010] At least one elastic component, one end of the elastic component is connected to the main line or the injection molded shell on the side around the main line, and the other end is connected to the corresponding branch line or the injection molded shell on the side around the branch line, so that when the branch line bends toward the direction close to the main line, the elastic component provides support for the branch line, and a preset bending angle is set between the branch line and the main line.

[0011] Optionally, the preset bending angle is in the range of 20°-90°.

[0012] Optionally, it also includes:

[0013] The telescopic tube is attached to the peripheral side of the second insulating layer, and the end of the telescopic tube is fixedly connected to the second insulating layer by hot melting.

[0014] Optionally, the telescopic tube is made of polytetrafluoroethylene.

[0015] Optionally, the first conductor and the second conductor are fixedly connected by ultrasonic welding.

[0016] Optionally, the elastic component is a fluoroplastic spring structure.

[0017] Optionally, there are multiple elastic components, and every two elastic components are symmetrically arranged about the corresponding branch line.

[0018] Optionally, the first insulating layer and the second insulating layer are both made of silicone rubber material.

[0019] Optionally, the injection-molded shell is made of TPV material.

[0020] The photovoltaic branch cable of the utility model is achieved by fixedly connecting the first conductor of the main line with the second conductor of the branch line, and the first insulating layer with the second insulating layer, and an injection-molded shell is provided on the side around the connection between the first insulating layer and the second insulating layer, and an elastic component is provided between the main line and the branch line, which is used to provide support for the branch line when the branch line is bent in a direction close to the main line, so that the electric energy of the branch line is converged to the second conductor of the main line through the first conductor, effectively preventing current leakage, improving the safety of the photovoltaic branch cable, and avoiding the connection between the first insulating layer and the second insulating layer from being cracked due to excessive force due to the bending of the branch line, further preventing current leakage from occurring at the connection between the first insulating layer and the second insulating layer, thereby achieving the goal of converging the electric energy provided by multiple solar panels while further improving the safety of the photovoltaic branch cable.

[0021] Furthermore, the telescopic tube of the utility model is attached to the circumferential side of the second insulating layer, and the end of the telescopic tube is fixedly connected to the second insulating layer by hot melting, so that the second insulating layer and the telescopic tube form a sealed connection, and at the same time, the inner wall of the telescopic tube is attached to the circumferential side of the second insulating layer, so that the telescopic tube and the second insulating layer form a structurally stable whole, so as to improve the bending performance of the branch line, and also improve the convenience of straight line storage, reduce the space occupied by the straight line, and facilitate the adjustment of the preset bending angle between the branch line and the main line, thereby improving the convenience of laying the photovoltaic branch cable, thereby improving the laying efficiency of the photovoltaic branch cable.

[0022] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 is a schematic overall structural diagram of a photovoltaic branch cable according to an embodiment of the utility model;

[0025] Figure 2 is a schematic partial structural diagram of a photovoltaic branch cable according to an embodiment of the utility model;

[0026] Figure 3 A schematic structural diagram of a photovoltaic branch cable according to yet another embodiment of the utility model.

[0027] Reference numerals:

[0028] 100-photovoltaic branch cable, 10-main line, 11-first conductor, 12-first insulating layer, 111-main body, 20-branch line, 21-second conductor, 22-second insulating layer, 30-injection molded shell, 40-elastic component, 50-telescopic tube. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] Figure 1 is a schematic overall structural diagram of a photovoltaic branch cable according to an embodiment of the utility model, Figure 2 It is a schematic partial structural diagram of a photovoltaic branch cable according to an embodiment of the utility model.

[0034] like Figure 1As shown, the utility model provides a photovoltaic branch cable 100. The photovoltaic branch cable 100 includes a main line 10, at least one branch line 20, at least one injection molded shell 30 corresponding to each branch line 20, and at least one elastic component 40. The main line 10 includes a first conductor 11 and a first insulating layer 12, the first insulating layer 12 is sleeved on the circumference of the first conductor 11, the first conductor 11 includes a main body 111, each branch line 20 includes a second conductor 21 and a second insulating layer 22, the second insulating layer 22 is sleeved on the circumference of the second conductor 21, and the end of each second conductor 21 is arranged to be connected to the first conductor 11. The main body 111 of the main line 10 is fixedly connected, the end of each second insulating layer 22 is fixedly connected to the end of the first insulating layer 12, the injection molded shell 30 is sleeved on the peripheral side of the connection between the first insulating layer 12 and the second insulating layer 22, one end of the elastic component 40 is connected to the main line 10 or the injection molded shell 30 on the peripheral side of the main line 10, and the other end is connected to the corresponding branch line 20 or the injection molded shell 30 on the peripheral side of the branch line 20, so as to provide support for the branch line 20 when the branch line 20 bends toward the direction close to the main line 10, and a preset bending angle is set between the branch line 20 and the main line 10. Here, the number of the branch lines 20 can be one or more, the number of the injection molded shells 30 is the same as the number of the straight lines, and the injection molded shells 30 are arranged symmetrically about the branch lines 20, the number of the elastic components 40 can be one or more, one or two elastic components 40 are arranged between each branch line 20 and the main body 111 of the main line 10, and multiple elastic components 40 can also be arranged between each branch line 20 and the main body 111 of the main line 10.

[0035] In the photovoltaic branch cable 100 of the present embodiment, the first conductor 11 of the main line 10 is fixedly connected to the second conductor 21 of the branch line 20, the first insulating layer 12 is fixedly connected to the second insulating layer 22, and an injection molded shell 30 is provided on the surrounding side of the connection between the first insulating layer 12 and the second insulating layer 22. At the same time, an elastic component 40 is provided between the main line 10 and the branch line 20, which is used to provide support force for the branch line 20 when the branch line 20 is bent toward the direction close to the main line 10, so that the electric energy of the branch line 20 is gathered to the second conductor 21 of the main line 10 through the first conductor 11, effectively preventing current leakage and improving the safety of the photovoltaic branch cable 100. At the same time, the elastic component 40 is configured to provide support force for the branch line 20 when the branch line 20 is bent, avoiding the connection between the first insulating layer 12 and the second insulating layer 22 from being cracked due to excessive force due to the bending of the branch line 20, and further preventing current leakage from occurring at the connection between the first insulating layer 12 and the second insulating layer 22, thereby achieving the goal of gathering the electric energy provided by multiple solar panels while further improving the safety of the photovoltaic branch cable 100.

[0036] In this embodiment, there are multiple branches 20, and the multiple second conductors 21 of the multiple branches 20 are fixedly connected to the main body 111 of the first conductor 11 of the main line 10. Each branch 20 is connected to a solar panel. By connecting the main body 111 of the main line 10 of the photovoltaic branch cable 100 to the multiple branches 20, the electric energy generated by the multiple solar panels is converged to the main line 10, thereby improving the electric energy convergence rate.

[0037] In this embodiment, by integrating multiple branches 20 of the photovoltaic branch cable 100 into a single main line 10, the length of the branch line 20 of the photovoltaic branch cable 100 and the branch point of the main line 10 are designed according to the number of solar panels of each solar group at the installation site, so that during actual installation, laying one photovoltaic branch cable 100 can collect the electric energy generated by multiple solar panels in multiple solar groups, reducing the construction operations of laying multiple photovoltaic branch cables 100, thereby improving the laying efficiency of the photovoltaic branch cable 100. At the same time, the photovoltaic branch cable 100 in this embodiment can ensure that each branch line 20 is consistent with the actual distance required for laying the cable for each corresponding solar panel, which not only saves resources, but also ensures the convenience of cable laying.

[0038] Figure 3 A schematic structural diagram of a photovoltaic branch cable according to yet another embodiment of the utility model.

[0039] like Figure 3 As shown, in another embodiment, each injection molded shell 30 is configured so that one end thereof is sleeved on the connection between the branch line 20 and the main line 10, and the other end thereof is configured so as to extend a preset distance along the extension direction of the main body 111. That is to say, the injection molded shell 30 is disposed at the connection between the branch line 20 and the main line 10, which can effectively prevent current leakage and improve the safety of the photovoltaic branch cable 100. At the same time, the injection molded shell 30 is configured so that the other end thereof extends a preset distance along the extension direction of the main line 10, and the extension direction of each injection molded shell 30 of the main line 10 is the same, which can not only effectively prevent current leakage, but also effectively save costs and reduce waste of resources. Here, the elastic component 40 is not shown in this embodiment. The elastic component 40 of this embodiment can be disposed on the left side of the branch line 20, or on the right side of the branch line 20, or on the left and right sides of the branch line 20, respectively.

[0040] In a further embodiment, the preset bending angle between the branch line 20 and the main line 10 of the photovoltaic branch cable 100 is in the range of any value between 20° and 90°. In this embodiment, the preset bending angle between the branch line 20 and the main line 10 can be 20°, 30°, 40°, 50°, 60°, 70°, 80° or 90°, or any other value between 20° and 90°. That is to say, the branch line 20 is fixedly connected to the main line 10, and the preset bending angle between the branch line 20 and the main line 10 is 90°, and the branch line 20 is set so that the preset bending angle between it and the main line 10 is adjustable, that is, the preset bending angle between the branch line 20 and the main line 10 can be adjusted according to the actual position of the solar panel corresponding to each branch line 20, so that the laying position of the branch line 20 meets the setting position of the corresponding solar panel, thereby improving the laying efficiency and convenience of multiple branches 20. At the same time, when the preset bending angle between the branch line 20 and the main line 10 of the photovoltaic branch cable 100 is any value between 20° and 90°, it can avoid the distance between the branch line 20 and the main line 10 being too small, resulting in a decrease in the heat dissipation efficiency of the photovoltaic branch cable 100, and can also avoid the problem of cracking at the connection due to pulling at a small angle, that is, avoiding cracking at the connection between the first insulating layer 12 and the second insulating layer 22 between the branch line 20 and the main line 10, making the connection between the branch line 20 and the main line 10 more stable, thereby improving the laying stability of the photovoltaic branch cable 100.

[0041] like Figure 2 As shown, in a further embodiment, the photovoltaic branch cable 100 also includes a telescopic tube 50, which is attached to the circumferential side of the second insulating layer 22, and the end of the telescopic tube 50 is fixedly connected to the second insulating layer 22 by hot melting, that is, the end of the telescopic tube 50 is fixedly connected to the second insulating layer 22 of the branch line 20 by hot melting, so that the second insulating layer 22 and the telescopic tube 50 form a sealed connection, and at the same time, the inner wall of the telescopic tube 50 is attached to the circumferential side of the second insulating layer 22. That is to say, the inner diameter of the telescopic tube 50 is equal to the outer diameter of the second insulating layer 22 of the branch line 20, so that the telescopic tube 50 can be covered on the outer surface of the branch line 20, and the telescopic tube 50 and the branch line 20 are sealed at both ends by hot-melt technology, so that the telescopic tube 50 and the second insulating layer 22 form a structurally stable whole, so as to improve the bending performance of the branch line 20, and also improve the convenience of straight line storage, reduce the space occupied by the straight line, and facilitate the adjustment of the preset bending angle between the branch line 20 and the main line 10, thereby improving the convenience of laying the photovoltaic branch cable 100, thereby improving the laying efficiency of the photovoltaic branch cable 100.

[0042] In a further embodiment, the telescopic tube 50 is made of polytetrafluoroethylene material. Polytetrafluoroethylene material has the characteristics of strong plasticity, excellent waterproof performance, high strength, high tensile strength and high elongation at break, and has strong high temperature resistance. In other words, the telescopic tube 50 made of polytetrafluoroethylene material has high strength, tensile strength and elongation at break, so that the telescopic tube 50 can be guaranteed not to break at the folding part when it is repeatedly extended and retracted during the folding process, thereby improving the service life of the branch line 20 and improving the waterproof performance of the telescopic tube 50. At the same time, the fixing part made of polytetrafluoroethylene material can stably fix the branch line 20 at the position to be laid, so as to improve the laying stability of the photovoltaic branch cable 100. Here, the telescopic ratio of the telescopic tube 50 is any value in the range of 0.4-0.6, that is, the telescopic ratio of the telescopic tube 50 can be 0.4, 0.45, 0.5, 0.55 or 0.6, or any other value in the range of 0.4-0.6. When the telescopic ratio of the telescopic tube 50 is within the above numerical range, the foldability of the branch line 20 can be improved.

[0043] In a further embodiment, the first conductor 11 and the second conductor 21 are fixedly connected by ultrasonic welding, that is, the first conductor 11 and the second conductor 21 generate heat by high-frequency vibration, so that the metal conductors are welded together under a specific pressure, which can significantly reduce the contact resistance. And because every percentage of loss in the photovoltaic system may affect the overall power generation efficiency of the photovoltaic branch cable 100, the low-impedance connection between the first conductor 11 and the second conductor 21 is achieved by ultrasonic welding, thereby improving the power transmission efficiency of the photovoltaic branch cable 100. In addition, ultrasonic welding can ensure a tight connection between the first conductor 11 and the second conductor 21, avoid current loss in the photovoltaic branch cable 100 due to poor contact, and thus improve the current conduction capacity of the photovoltaic branch cable 100.

[0044] In this embodiment, the first conductor 11 and the second conductor 21 are fixedly connected by ultrasonic welding, so that the connection between the first conductor 11 and the second conductor 21 reaches or exceeds the mechanical strength of the original conductor material, and the welding part's ability to withstand tension and pressure is improved, thereby improving the durability of the photovoltaic branch cable 100. At the same time, since the photovoltaic branch cable 100 is usually set outdoors and is affected by wind, rain and temperature changes, the ultrasonic welded joint can better resist the vibration and impact caused by the above environmental factors, thereby extending the service life of the cable. In addition, ultrasonic welding can improve the sealing of the connection between the first conductor 11 and the second conductor 21, effectively preventing moisture from invading and causing damage or corrosion to the photovoltaic branch cable 100, thereby extending the service life of the cable.

[0045] In this embodiment, after the first conductor 11 and the second conductor 21 form a welding point by ultrasonic welding, the surface of the first conductor 11 and the surface of the second conductor 21 are thermally fused due to the heat generated by ultrasonic welding and become more uniform and tight, reducing the contact area between oxygen and pollutants and the first conductor 11 and the second conductor 21, thereby enhancing the antioxidant and corrosion resistance of the photovoltaic branch cable 100. At the same time, since ultrasonic welding provides a permanent connection with high strength and strong environmental adaptability, it can effectively reduce the maintenance requirements and repair costs of the connection part of the first conductor 11 and the second conductor 21 in the photovoltaic branch cable 100. In addition, the stability of ultrasonic welding is high, which can effectively reduce the risk of system failure caused by the failure of the connection between the first conductor 11 and the second conductor 21, and improve the operation stability and reliability of the photovoltaic branch cable 100. The ultrasonic welding equipment is simple to operate, does not require complicated preparation work, is suitable for a fast production environment, and is suitable for cable conductor materials of various sizes and types, has strong versatility and flexibility, and can connect various sizes and types of branch lines 20 and wires, thereby improving the laying efficiency of the photovoltaic branch cable 100.

[0046] In a further embodiment, the elastic component 40 is a fluoroplastic spring structure. In this embodiment, the elastic component 40 is a spring structure of polytetrafluoroethylene material. Polytetrafluoroethylene material has the characteristics of high strength, high tensile strength, and high elongation at break, so that the telescopic performance and tensile performance of the fluoroplastic spring structure are both high, thereby improving the telescopic performance and tensile performance of the elastic component 40, so that when the branch line 20 is adjusted to form a small angle with the main line 10, the elastic component 40 can provide support for the branch line 20, avoiding cracking at the connection between the first insulating layer 12 and the second insulating layer 22 due to the small angle, thereby improving the structural stability of the photovoltaic branch cable 100.

[0047] In a further embodiment, the number of elastic components 40 is multiple, and every two elastic components 40 are symmetrically arranged about the corresponding branch line 20. In this embodiment, the number of elastic components 40 is multiple, the number of branch lines 20 is multiple, and two elastic components 40 are correspondingly arranged on opposite sides of each branch line 20, and each elastic component 40 provides a supporting force in a corresponding direction for the bending of the corresponding branch line 20, thereby avoiding cracking at the connection between the first insulating layer 12 and the second insulating layer 22 due to a small angle, thereby improving the structural stability of the photovoltaic branch cable 100.

[0048] In a further embodiment, the first insulating layer 12 and the second insulating layer 22 are both made of silicone rubber material. The temperature tolerance level of the silicone rubber material is any value in the range of 125°C-200°C, the tensile strength elongation is any value in the range of 10MPa-16.0MPa, and the elongation is any value in the range of 150%-450%. That is, the first insulating layer 12 and the second insulating layer 22 made of silicone rubber material can withstand temperatures of 125°C, 130°C, 135°C, 150°C, 170°C, 175°C, 180°C, 190°C or 200°C, or any other value between 125°C and 200°C, and their elongation can be 10MPa, 11MPa, 12MPa, 13MPa, 14MPa 15MPa or 16.0MPa, or any other value between 10MPa and 16MPa, and their elongation can be 150%, 200%, 250%, 300%, 350% or 400%, or any other value between 150% and 450%. That is, the first insulating layer 12 and the second insulating layer 22 made of silicone rubber material can effectively improve the mechanical properties of the photovoltaic branch cable 100, and at the same time improve the aging resistance of the photovoltaic branch cable 100 in outdoor use.

[0049] In a further embodiment, the injection molded housing 30 is made of TPV material. Since TPV material has excellent anti-aging, ozone resistance and UV resistance, it can adapt to harsh outdoor environments and maintain the long-term stability of the material. The temperature resistance range of TPV material is any value between -60°C and 150°C, so that the photovoltaic branch cable 100 prepared by TPV material can meet the use requirements under different climatic conditions. In addition, TPV material has good electrical insulation performance, which can improve the electrical insulation performance of the photovoltaic branch cable 100, avoid current leakage of the photovoltaic branch cable 100, and ensure the power transmission efficiency of the photovoltaic branch cable 100.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A photovoltaic branch cable, characterized in that: include: A main line, comprising a first conductor and a first insulating layer, wherein the first insulating layer is sleeved on a circumferential side of the first conductor, and the first conductor comprises a main body; At least one branch line, each of the branch lines comprising a second conductor and a second insulating layer, the second insulating layer being sleeved on the circumference of the second conductor, and the end of each second conductor being arranged to be fixedly connected to the main body of the first conductor, and the end of each second insulating layer being fixedly connected to the end of the first insulating layer; At least one injection-molded housing is provided corresponding to each branch line and is sleeved on the peripheral side of the connection between the first insulating layer and the second insulating layer; At least one elastic component, one end of the elastic component is connected to the main line or the injection molded shell on the side around the main line, and the other end is connected to the corresponding branch line or the injection molded shell on the side around the branch line, so that when the branch line bends toward the direction close to the main line, the elastic component provides support for the branch line, and a preset bending angle is set between the branch line and the main line.

2. The photovoltaic branch cable according to claim 1, characterized in that: The preset bending angle ranges from 20° to 90°.

3. The photovoltaic branch cable according to claim 2, characterized in that: Also includes: The telescopic tube is attached to the peripheral side of the second insulating layer, and the end of the telescopic tube is fixedly connected to the second insulating layer by hot melting.

4. The photovoltaic branch cable according to claim 3, characterized in that: The telescopic tube is made of polytetrafluoroethylene.

5. The photovoltaic branch cable according to claim 4, characterized in that: The first conductor and the second conductor are fixedly connected by ultrasonic welding.

6. The photovoltaic branch cable according to any one of claims 1 to 5, characterized in that: The elastic component is a fluoroplastic spring structure.

7. The photovoltaic branch cable according to claim 6, characterized in that: There are multiple elastic components, and every two elastic components are symmetrically arranged about the corresponding branch line.

8. The photovoltaic branch cable according to claim 7, characterized in that: The first insulating layer and the second insulating layer are both made of silicone rubber.

9. The photovoltaic branch cable according to claim 8, characterized in that: The injection molded housing is made of TPV material.

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