Photovoltaic flexible energy storage power cable

Abstract

The invention, which relates to the technical field of the power cable, provides a photovoltaic flexible energy storage power cable comprising a main body mechanism, a snake bone bending mechanism and a protection mechanism. The snake bone bending mechanism comprises a shielding layer, two temperature measurement optical fibers, a semiconductor chilling plate, two heat conduction strips, a set of temperature control rings, a set of annular frameworks and a set of filling bags. The phase-change material in the filling bag can be controlled to be reversibly melted and solidified under the precise temperature control of the semiconductor chilling plate and the heat conducting ring, so that the mutual positions of the annular frameworks are driven and locked, and the installation complexity and the man-hour cost are greatly reduced; the problems of sheath pressing damage caused by external binding, stress concentration and form failure caused by tool aging and loosening are also avoided, form resetting can be realized by controlling the temperature again, and the cable is endowed with the capability of repeated shaping and self-adaptive laying path; and the installation flexibility, the form stability and the long-term operation reliability of the cable in a complex photovoltaic field station are obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic cable, in particular to a photovoltaic flexible energy storage power cable. BACKGROUND

[0002] The photovoltaic cable is a special cable specially designed for a solar photovoltaic power generation system, mainly used for long-term and safe transmission of direct current power generated by photovoltaic modules in open and harsh environments, connecting key equipment such as photovoltaic panels, combiner boxes, inverters and power distribution devices, etc. The structural design focuses on flexibility and mechanical strength, which can resist bending, twisting, stretching and thermal expansion and contraction caused by climate change during installation and use, and pass strict weather resistance tests to prevent cracking or performance degradation caused by environmental stress. The core mission is to maintain stable insulation resistance and low transmission loss under complex climate conditions such as strong sunlight, rain and snow, salt fog, and humidity. It is an indispensable special component for safe, efficient and durable power transmission in photovoltaic systems.

[0003] During the installation and laying process of the photovoltaic cable in the photovoltaic power station, it is often necessary to bend and fix it in a specific shape according to the on-site support structure, the change of the direction or the avoidance of obstacles. However, the widely used photovoltaic cable at present is made of high-elasticity insulation and sheath materials to improve its torsional resistance, fatigue resistance and long-term reliability, and is often supplemented by spiral winding or twisted internal reinforcing structure, which makes it difficult for the cable to stably maintain the required bending angle or arc during construction. The construction personnel must rely on external tools such as straps, buckles, binding wires or special clamps to forcibly bundle and limit them, so as to achieve the fixation of the bending shape. This not only increases the complexity and working hours of installation, and improves the cost of manpower and auxiliary materials, but also causes potential damage to the cable sheath or forms fixed stress points due to the pressure concentration or long-term aging and loosening of the external binding tools, affecting the stability and safety of the long-term use of the cable. SUMMARY

[0004] In view of the above deficiencies of the prior art, the purpose of the embodiments of the present application is to provide a photovoltaic flexible energy storage power cable, which can solve the technical problems of the prior art that cannot realize the fixation of the bending shape, increase the installation time and cost, and cause damage to the cable.

[0005] The present application provides a photovoltaic flexible energy storage power cable, which comprises a main body mechanism, a snake bone bending mechanism and a protection mechanism. The snake bone bending mechanism comprises a shielding layer, two temperature measuring optical fibers, a semiconductor refrigerating sheet, two heat conducting strips, a group of temperature control rings, a group of annular skeletons and a group of filling capsules, both of the two temperature measuring optical fibers are fixedly inserted in the inside of the shielding layer, both of the two heat conducting strips are fixedly installed on the outer surface wall of the shielding layer, a group of temperature control rings are fixedly sleeved on the outer surface wall of the shielding layer, a group of annular skeletons are fixedly sleeved between the outer surface walls of the two heat conducting strips, the outer surface wall of each of a group of filling capsules is mutually adhered with the outer surface wall of the annular skeleton, and the outer surface wall of a group of temperature control rings is in contact with the outer surface wall of the filling capsule.

[0006] Preferably, the heat conducting strip comprises a heat pipe and a heat insulation sleeve, and the heat pipe is fixedly inserted in the inside of the heat insulation sleeve.

[0007] Preferably, the temperature control ring comprises a heat conducting copper ring and a heat insulation ring, and the heat conducting copper ring is fixedly sleeved on the outer surface wall of the heat insulation ring.

[0008] Preferably, the inside of the snake bone bending mechanism is fixedly inserted with a main body mechanism, and the main body mechanism comprises a group of conductors, a group of insulating layers, a filling layer, a heat conducting layer and a pressure detection optical fiber.

[0009] Preferably, a group of the insulating layers are sleeved on the outer surface wall of the conductor, and the outer surface walls of a group of the insulating layers are fixedly sleeved with the filling layer.

[0010] Preferably, the inside of the heat conducting layer is fixedly inserted with the filling layer, and the pressure detection optical fiber is fixedly inserted in the inside of the filling layer.

[0011] Preferably, the outer surface wall of the snake bone bending mechanism is fixedly sleeved with a protection mechanism, and the protection mechanism comprises an elastic shock absorbing layer, a fireproof layer and a protection layer.

[0012] Preferably, the fireproof layer is fixedly sleeved on the outside of the elastic shock absorbing layer, and the outer surface wall of the fireproof layer is fixedly sleeved with the protection layer.

[0013] Preferably, the protection layer comprises a biological repellent layer, a physical protection layer and a reflective coating, and the outer surface wall of the biological repellent layer is fixedly sleeved with the physical protection layer.

[0014] Preferably, the outer surface wall of the physical protection layer is provided with the reflective coating, and the coating contains a thermochromic material component and high reflectivity metal oxide particles.

[0015] The technical scheme provided by the embodiment of the application has at least the following beneficial effects: In the embodiment of the present application, the phase change material in the cable filling bag can undergo reversible melting and solidification under the precise temperature control of the semiconductor refrigeration sheet and the heat conducting ring, thereby driving and locking the mutual position of the annular framework. This process is completely completed by the temperature control system built in the cable, without the need for external auxiliary tools such as straps and buckles, which not only greatly reduces the complexity and labor cost of installation, but also avoids the problems of sheath pressure injury, stress concentration and form failure caused by tool aging and loosening due to external binding. At the same time, the mechanism is reversible, and the form can be reset by controlling the temperature again, which gives the cable the ability to repeat shaping and adapt to the laying path, significantly improving the installation flexibility, form stability and long-term operation reliability of the cable in complex photovoltaic stations. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0017] Figure 1 is a structural schematic diagram of a photovoltaic flexible energy storage power cable provided by an embodiment of the present application.

[0018] Figure 2 is a three-dimensional schematic diagram of a main body mechanism of a photovoltaic flexible energy storage power cable provided by an embodiment of the present application.

[0019] Figure 3 is a three-dimensional diagram of a snake bone bending mechanism of a photovoltaic flexible energy storage power cable provided by an embodiment of the present application.

[0020] Figure 4 is an internal structure diagram of a snake bone bending mechanism of a photovoltaic flexible energy storage power cable provided by an embodiment of the present application.

[0021] Figure 5 is a three-dimensional schematic diagram of a snake bone bending mechanism of a photovoltaic flexible energy storage power cable provided by an embodiment of the present application.

[0022] Figure 6 is a sectional view of a snake bone bending mechanism and a protection mechanism of a photovoltaic flexible energy storage power cable provided by an embodiment of the present application.

[0023] Figure 7 is a plan view of a photovoltaic flexible energy storage power cable provided by an embodiment of the present application.

[0024] Explanation of reference signs: 1-main body mechanism; 11-conductor; 12-insulating layer; 13-filling layer; 14-heat conduction layer; 15-pressure detection optical fiber; 2-snake bone bending mechanism; 21-shielding layer; 22-temperature measurement optical fiber; 23-semiconductor refrigeration piece; 24-heat conduction strip; 241-heat pipe; 242-heat insulation sleeve; 25-temperature control ring; 251-heat conduction copper ring; 252-heat insulation ring; 26-ring-shaped framework; 27-filling capsule; 3-protection mechanism; 31-elastic shock-absorbing layer; 32-fireproof layer; 33-protection layer; 331-biological repellent layer; 332-physical protection layer; 333-reflective coating. DETAILED DESCRIPTION

[0025] In order for those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions of the present application will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0026] In addition, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concepts disclosed in the present application.

[0027] The exemplary embodiments will be described in detail below with reference to the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0028] Reference is made to the drawings Figures 1 to 7 The structure of the photovoltaic flexible energy storage power cable provided by the embodiments of the present application comprises a main body mechanism 1, a snake bone bending mechanism 2, and a protection mechanism 3. The snake bone bending mechanism 2 comprises a shielding layer 21, two temperature measurement optical fibers 22, a semiconductor refrigeration piece 23, two heat conduction strips 24, a set of temperature control rings 25, a set of ring-shaped frameworks 26, and a set of filling capsules 27. The two temperature measurement optical fibers 22 are fixedly inserted inside the shielding layer 21, and the two heat conduction strips 24 are fixedly installed on the outer wall of the shielding layer 21. The outer wall of the shielding layer 21 is fixedly sleeved with the set of temperature control rings 25, which are fixedly installed between the outer walls of the two heat conduction strips 24. The outer walls of the two heat conduction strips 24 are fixedly sleeved with the set of ring-shaped frameworks 26, and the outer walls of each of the set of filling capsules 27 are adhered to the outer walls of the ring-shaped frameworks 26. The outer walls of the set of temperature control rings 25 are in contact with the outer walls of the filling capsules 27.

[0029] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects: In the embodiment of the present application, the inside of the filling bag 27 is filled with a phase change material. Under normal circumstances, the phase change material in the inside of the filling bag 27 is in a solid state, so that the plurality of annular skeletons 26 are arranged in a straight line in the longitudinal direction. At this time, the cable is in a horizontal state. When the cable needs to be bent, the user first starts the semiconductor refrigeration sheet 23. At this time, the semiconductor refrigeration sheet 23 starts to heat up at one place close to the two heat-conducting strips 24, and the other side starts to cool down. The heating surface transmits heat to the heat-conducting strips 24. The heat-conducting strips 24 have good heat-conducting effect and can quickly transmit heat to the inside of the plurality of temperature control rings 25 in contact with them, respectively. At this time, the temperature control rings 25 start to heat up. Since the temperature control rings 25 are in contact with the top filling bag 27, and only the bottom surface of the filling bag 27 in contact with the temperature control rings 25 is made of non-heat-insulating material, the high-temperature temperature control rings 25 melt the solid phase change material in the inside at this time. The melted phase change material can flow in the inside of the filling bag 27, facilitating the movement of the annular skeletons 26. At this time, the user bends the entire cable according to the actual work needs, drives the annular skeletons 26 in the bent part to start to move, and the inside of the annular skeletons 26 are close to each other and extrude the filling bag 27 in the middle, so that the volume of the filling bag 27 is reduced and the phase change liquid is pushed away. At this time, the outside of the annular skeletons 26 are away from each other. The phase change material in the inside of the filling bag 27 that is extruded starts to flow to this place, so that the filling bag 27 expands. After the cable is bent, the user changes the current of the semiconductor refrigeration sheet 23, so that the cold and hot surfaces start to change. The side close to the heat-conducting strips 24 starts to cool down. Therefore, the heat-conducting strips 24 start to absorb the heat in the inside of the filling bag 27 by means of the temperature control rings 25 fixed thereto, so that the phase change material cools down and solidifies quickly, keeps the current shape unchanged, thereby fixing the positions of the plurality of annular skeletons 26 and keeping the cable in a bent state. The entire process does not need to rely on any external tool. Not only is the installation process greatly simplified, but the dependence on auxiliary tools and the cost of construction are also reduced. Moreover, the risk of damage to the sheath, stress concentration and failure of the shape caused by the pressure concentration or long-term aging and loosening of the external binding tool is avoided. The long-term reliability and stability of the cable in a bent state are ensured. At the same time, the process is reversible. When it is necessary to adjust again, the shape can be reset by heating locally again, so that the cable has the intelligent adaptive ability of repeated shaping. The temperature measuring optical fiber 22 is used to monitor the temperature nearby in real time, so that people can accurately control the heating or cooling power of the semiconductor refrigeration sheet 23, so that the phase change material completes melting or solidification within a set time, prevents rigid failure caused by accidental heating or loss of flexibility caused by accidental cooling, and ensures the smooth development of the entire work. The shielding layer 21 can effectively block external electromagnetic interference, prevent power grid noise, radiation and the like from affecting the purity of internal power transmission, prevent noise generated by the cable itself control circuit from leaking out and interfering with other equipment, and can delay insulation aging through uniform electric field.

[0030] In a possible implementation, the heat-conducting strip 24 comprises a heat pipe 241 and a heat-insulating sleeve 242, and the heat pipe 241 is fixedly inserted into the heat-insulating sleeve 242.

[0031] In the embodiment of the present application, the heat pipe 241 is used to achieve heat transfer, which effectively improves the speed and effect of heat transfer. Meanwhile, the heat-insulating sleeve 242 wrapped on the outer wall of the heat pipe 241 not only prevents the loss of heat during the heat transfer process, but also effectively avoids the transmission of heat from the outside or the cable operation to the heat pipe 241, which leads to the accidental melting of the phase change material and causes the sudden deformation of the cable.

[0032] In a possible implementation, the temperature control ring 25 comprises a heat-conducting copper ring 251 and a heat-insulating ring 252, and the heat-conducting copper ring 251 is fixedly sleeved on the outer wall of the heat-insulating ring 252.

[0033] In the embodiment of the present application, the heat-conducting copper ring 251 is made of pure copper, which has good heat-conducting effect and can quickly melt or solidify the phase change material in the filling bag 27. The heat-insulating ring 252 at the bottom of the heat-conducting copper ring 251 effectively prevents the heat generated during the operation of the cable from being transmitted to the surface of the heat-conducting copper ring 251, thereby ensuring that the cable is always in a stable bending state.

[0034] In a possible implementation, the inside of the snake-bone bending mechanism 2 is fixedly inserted with the main body mechanism 1, and the main body mechanism 1 comprises a group of conductors 11, a group of insulation layers 12, a filling layer 13, a heat-conducting layer 14 and a pressure detection optical fiber 15.

[0035] In the embodiment of the present application, the main body mechanism 1 is the core structure, which realizes the basic power transmission function of the power cable.

[0036] In a possible implementation, the group of insulation layers 12 are all sleeved on the outer wall of the conductor 11, and the filling layer 13 is fixedly sleeved between the outer walls of the group of insulation layers 12.

[0037] In the embodiment of the present application, the inner insulation layer 12 is made of special cross-linked polyolefin high-performance material, which can still maintain excellent electrical insulation performance and long-term stability under extreme environmental conditions. This layer can effectively isolate the conductor 11 to prevent current leakage or short circuit, thereby providing a basic guarantee for the safe and stable operation of the entire photovoltaic system. The filling layer 13 mainly plays a role in structural support, buffering and stabilization, can fix the relative positions of multiple cores, prevent displacement or mutual friction damage due to vibration or bending during use or installation, and also helps to maintain the roundness of the cable cross section, optimize the uniformity of the outer sheath, and improve the overall mechanical properties and torsional resistance of the cable.

[0038] In a possible implementation, the inner part of the heat-conducting layer 14 is fixedly provided with the filling layer 13, and the pressure detection optical fiber 15 is fixedly provided in the inner part of the filling layer 13.

[0039] In the embodiment of the present application, the heat-conducting layer 14 is composed of a material with high thermal conductivity, which plays a core role in quickly conducting the heat generated by the conductor 11 during operation from the inside, avoiding the risk of local overheating, accelerated aging of insulation, and even thermal breakdown caused by heat accumulation. The heat-conducting layer 14 can improve the actual current-carrying capacity of the cable, maintain stable electrical performance, and the pressure detection optical fiber 15 integrated in the cable can measure mechanical stress such as external compression, impact, and excessive bending, so that the operation and maintenance personnel can timely discover potential structural damage of the cable caused by improper laying and bending, external compression, or geological disasters, prevent faults caused by insulation damage and deformation of the conductor 11, and greatly improve the reliability and safety of the operation of the photovoltaic cable system.

[0040] In a possible implementation, the outer wall of the snake bone bending mechanism 2 is fixedly provided with the protection mechanism 3, and the protection mechanism 3 includes an elastic damping layer 31, a fireproof layer 32, and a protective layer 33.

[0041] In the embodiment of the present application, the protection mechanism 3 as the outermost structure effectively avoids damage to the cable caused by external force, ensuring the stability of the cable.

[0042] In a possible implementation, the fireproof layer 32 is fixedly provided outside the elastic damping layer 31, and the outer wall of the fireproof layer 32 is fixedly provided with the protective layer 33.

[0043] In the embodiment of the present application, when the cable is subjected to external impact, high-frequency vibration, periodic bending, or compression, the elastic damping layer 31 efficiently absorbs and disperses mechanical energy through its elastic deformation, preventing the energy from being directly transmitted to the internal conductor 11, significantly reducing the risk of internal fracture due to vibration fatigue. The fireproof layer 32 is composed of ceramicized silicone rubber, which actively blocks the spread of flames and maintains line functionality when the cable encounters fire or high temperature, providing valuable time for fire warning, personnel evacuation, and emergency power supply of critical power circuits in photovoltaic power stations, and protecting the physical integrity and functional reliability of the cable during the entire life cycle, thereby prolonging the service life of the cable.

[0044] In a possible implementation, the protective layer 33 includes a biological repellent layer 331, a physical protection layer 332, and a reflective coating 333, and the outer wall of the biological repellent layer 331 is fixedly provided with the physical protection layer 332.

[0045] In the embodiment of the present application, the biological repellent layer 331 is uniformly compounded in the elastic polymer matrix by embedding natural repellents such as capsaicin, menthol, or specific synthetic formulations in microcapsules. When the animal bites the cable, the outer layer breaks, causing the microcapsules to rapidly release strong irritating odor substances, which act on the animal's olfactory and gustatory receptors, causing discomfort and prompting the animal to abandon the attack. This avoids damage to the sheath, exposure of the insulation, and even short circuit risks caused by animal behavior, without affecting the flexibility of the cable and the safety of the environment. The physical protection layer 332 uniformly disperses micron-sized inorganic particles with high hardness and wear resistance in the matrix material. When subjected to scratching or crushing by sharp objects, the hard particles can effectively share and resist stress, greatly improving the scratch and cut resistance of the surface layer. When the animal bites this layer, the uniformly distributed hard particles can produce a continuous sand-like feeling and damping when the teeth are occluded, greatly reducing the biting efficiency and willingness of the animal.

[0046] In one possible implementation, the outer wall of the physical protection layer 332 is provided with a reflective coating 333 containing a thermochromic material component and high-reflectivity metal oxide particles.

[0047] In the embodiment of the present application, the high-reflectivity metal oxide particles inside the reflective coating 333 can efficiently reflect infrared and ultraviolet light in sunlight, significantly reducing the surface temperature and internal heat load of the cable, and reducing damage caused by ultraviolet light. The thermochromic material causes the coating color to change reversibly with temperature, showing a significant color difference when locally overheated, thereby providing intuitive overheating positioning and early warning for inspection, and realizing surface protection that integrates passive cooling and active monitoring.

[0048] The present application encompasses any substitutions, modifications, equivalent methods, and solutions made to the essence and scope of the present application. In order to provide the public with a complete understanding of the present application, specific details of the preferred embodiments of the present application are described in detail, and the present application can be fully understood without these descriptions. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application.

Claims

1. A photovoltaic flexible energy storage power cable, characterized in that, Include: Main body mechanism (1), snake bone bending mechanism (2) and protection mechanism (3); The snake bone bending mechanism (2) includes a shielding layer (21), two temperature measuring optical fibers (22), a semiconductor refrigerating sheet (23), two heat conducting strips (24), a group of temperature control rings (25), a group of annular skeletons (26) and a group of filling capsules (27), both of the two temperature measuring optical fibers (22) are fixedly inserted in the inside of the shielding layer (21), both of the two heat conducting strips (24) are fixedly installed on the outer wall of the shielding layer (21), the outer wall of the shielding layer (21) is fixedly sleeved with a group of temperature control rings (25), a group of the temperature control rings (25) are fixedly installed between the outer walls of the two heat conducting strips (24), a group of annular skeletons (26) are fixedly sleeved between the outer walls of the two heat conducting strips (24), the outer wall of each of a group of the filling capsules (27) is mutually adhered with the outer wall of the annular skeleton (26), the outer wall of a group of the temperature control rings (25) is in contact with the outer wall of the filling capsule (27).

2. Photovoltaic flexible energy storage power cable according to claim 1, characterized in that, The heat conducting strip (24) includes a heat pipe (241) and a heat insulation sleeve (242), and the heat pipe (241) is fixedly inserted into the inside of the heat insulation sleeve (242).

3. Photovoltaic flexible energy storage power cable according to claim 1, characterized in that, The temperature control ring (25) includes a heat conducting copper ring (251) and a heat insulation ring (252), and the heat conducting copper ring (251) is fixedly sleeved on the outer wall of the heat insulation ring (252).

4. Photovoltaic flexible energy storage power cable according to claim 1, characterized in that, The inside of the snake bone bending mechanism (2) is fixedly inserted with the main body mechanism (1), and the main body mechanism (1) includes a group of conductors (11), a group of insulating layers (12), a filling layer (13), a heat conducting layer (14) and a pressure detection optical fiber (15).

5. Photovoltaic flexible energy storage power cable according to claim 4, characterized in that, A group of the insulating layers (12) are sleeved on the outer wall of the conductor (11), and a filling layer (13) is fixedly sleeved between the outer walls of a group of the insulating layers (12).

6. The photovoltaic flexible energy storage power cable according to claim 4, characterized in that, The inside of the heat conducting layer (14) is fixedly inserted with the filling layer (13), and the pressure detection optical fiber (15) is fixedly inserted into the inside of the filling layer (13).

7. The photovoltaic flexible energy storage power cable of claim 1, wherein, The outer wall of the snake bone bending mechanism (2) is fixedly sleeved with the protection mechanism (3), and the protection mechanism (3) includes an elastic damping layer (31), a fireproof layer (32) and a protection layer (33).

8. Photovoltaic flexible energy storage power cable according to claim 7, characterized in that, The fireproof layer (32) is fixedly sleeved on the outside of the elastic damping layer (31), and the outer wall of the fireproof layer (32) is fixedly sleeved with the protection layer (33).

9. Photovoltaic flexible energy storage power cable according to claim 7, characterized in that, The protection layer (33) includes a biological repellent layer (331), a physical protection layer (332) and a reflective coating (333), and the outer wall of the biological repellent layer (331) is fixedly sleeved with the physical protection layer (332).

10. Photovoltaic flexible energy storage power cable according to claim 9, characterized in that, The outer wall of the physical protection layer (332) is provided with the reflective coating (333), and the coating contains a thermochromic material component and high-reflectivity metal oxide particles.

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