High-temperature-resistant XLPE insulating environment-friendly power cable for energy storage system

Abstract

The utility model relates to the technical field of power cables, in particular to a high-temperature-resistant XLPE (cross linked polyethylene) insulating environment-friendly power cable for an energy storage system, which comprises a conductor formed by stranding a plurality of layers of bunches. The waterproof filling structure is used for filling gaps among the conductors; the flame-retardant belting layer is coated on the outer layers of the conductors and the water-blocking filling structure; the inner protective layer is extruded on the flame-retardant belting layer; the metal sheath layer is longitudinally overlapped and wrapped outside the inner sheath layer; and the outer sheath layer is extruded on the outer wall of the inner sheath layer. According to the utility model, the anti-aging, temperature-resistant and insulating properties of the cable are ensured by adopting double-layer insulation, and the flame-retardant belting layer is arranged between the conductor and the insulating layer, so that the thin copper wire is not easy to break, puncture and insulate, adhesion between the thin copper wire and the insulating material is avoided when the insulating material of the cable is recycled, the insulating material is easier to strip from the cable, and the service life of the cable is prolonged. And the carried metal impurities are few, and later recovery processing is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a high-temperature resistant XLPE insulated environmentally friendly power cable for an energy storage system. Background Art

[0002] High-temperature-resistant power cables for energy storage systems play a crucial role. Multiple battery modules are connected in series or parallel to form battery clusters, providing voltage and energy storage capacity. High-temperature-resistant power cables connect these battery modules, ensuring efficient power transmission. High-temperature-resistant power cables connect battery clusters in energy storage systems, enabling centralized management and distribution of electrical energy. The electrical energy generated by the battery clusters is fed via cables to a combiner box for aggregation or to an energy storage converter for conversion.

[0003] Current high-temperature cables for energy storage typically use cross-linked polyethylene as the insulation layer, which provides excellent insulation performance and current-carrying capacity. To ensure cable flexibility and flexible connection between the combiner box and battery modules, the cables are typically constructed from stranded oxygen-free copper wires. However, this method is not conducive to insulation recycling and can easily introduce a large amount of fine copper impurities when the insulation is stripped. Furthermore, the cables within energy storage systems are subjected to high temperatures and high pressures for extended periods, placing higher performance requirements on the cables' high-temperature aging and insulation aging. Utility Model Content

[0004] In response to the technical problems existing in energy storage cables in the prior art, the first aspect of the present invention proposes a high-temperature resistant XLPE insulated environmentally friendly power cable for an energy storage system, comprising:

[0005] Conductors formed by twisting multiple layers;

[0006] A water-blocking filling structure is filled in the gaps of the conductor;

[0007] A flame retardant tape layer is coated on the outer layer of the conductor and the water-blocking filling structure and is solidified into a cable core with a circular cross-section;

[0008] An inner protective layer, extruded on the outer surface of the flame retardant tape layer;

[0009] A metal sheath layer is longitudinally overlapped and wrapped around the outer surface of the inner sheath;

[0010] An outer sheath layer, extruded onto the outer wall of the metal sheath layer;

[0011] Among them, the flame-retardant wrapping tape layer includes a first flame-retardant wrapping tape layer formed by wrapping an inner wrapping tape and a second flame-retardant wrapping tape layer formed by wrapping an outer wrapping tape, the first flame-retardant wrapping tape layer is located on the inner side of the second flame-retardant wrapping tape layer, the inner flame-retardant wrapping tape layer and the outer wrapping tape include flame-retardant wrapping tape; the inner wrapping tape and the outer wrapping tape both include a base layer and a mesh layer, the base layer is constructed in a sheet shape, the mesh layer is constructed in a mesh shape, and the mesh layer is adhered and fixed to the surface of the base layer.

[0012] Preferably, the wrapping direction of the inner wrapping tape is opposite to the wrapping direction of the outer wrapping tape.

[0013] Preferably, the wrapping overlap rate of the inner wrapping tape is 30% to 50%.

[0014] Preferably, the wrapping overlap rate of the outer wrapping tape is 20-30%.

[0015] Preferably, a flame retardant layer is provided between the first flame retardant tape layer and the second flame retardant tape layer.

[0016] Preferably, the flame retardant layer includes a talcum powder layer adhered to the surface of the acrylic adhesive coated on the surface of the mesh layer.

[0017] Preferably, the inner layer wrapping tape and the outer layer wrapping tape both include a base layer and a mesh layer, the base layer is constructed in a sheet shape, the mesh layer is constructed in a mesh shape, and the mesh layer is fixed to the surface of the base layer.

[0018] Preferably, the mesh layers of the inner wrapping tape and the outer wrapping tape are arranged face to face.

[0019] Preferably, the conductor comprises a plurality of bundles of fine copper wires, and a water-blocking rope is provided in the gaps between the plurality of conductors to form a longitudinal water barrier.

[0020] Preferably, the inner sheath comprises a polyethylene insulation layer.

[0021] Preferably, the outer sheath layer includes a halogen-free, low-smoke, flame-retardant cross-linked polyolefin insulation layer.

[0022] Compared with the existing technology, the advantages of the high-temperature resistant XLPE insulated environmentally friendly power cable for energy storage system proposed in this utility model are:

[0023] The high-temperature resistant XLPE insulated environmentally friendly power cable for the energy storage system of the utility model adopts double-layer insulation with a middle metal sheath layer (wrapped with a lightweight flat aluminum sheath) to ensure the cable's anti-aging, heat resistance and insulation performance. At the same time, a flame-retardant tape layer is provided between the conductor and the insulation layer, so that the thin copper wire is not easy to break and puncture the insulation. It is also beneficial to avoid the adhesion of the thin copper wire and the insulation material when recycling the cable insulation material, making it easier to strip the insulation material from the cable, and carrying less metal impurities, which is conducive to later environmentally friendly recycling and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings.

[0025] Figure 1 It is a structural schematic diagram of a high-temperature resistant XLPE insulated environmentally friendly power cable for an energy storage system shown in the present invention.

[0026] Figure 2 It is a structural schematic diagram of the flame retardant tape layer shown in the present invention.

[0027] Figure 3 It is a schematic structural diagram of the inner layer wrapping tape and the outer layer wrapping tape shown in the present invention. DETAILED DESCRIPTION

[0028] In order to better understand the technical content of the present invention, specific embodiments are given and described below with reference to the accompanying drawings.

[0029] like Figure 1-3 As shown, according to an embodiment of the present invention, a high-temperature resistant XLPE insulated environmentally friendly power cable for an energy storage system includes a conductor 1, a water-blocking filling structure 2, a flame-retardant tape layer 3, an inner sheath 4, a metal sheath layer 5, and an outer sheath layer 6.

[0030] The conductor 1 is made of multiple layers of twisted thin copper wires, which can ensure the flexibility of the cable.

[0031] The conductor 1 includes multiple bundles of fine copper wires 11. Each bundle of fine copper wires can be formed by twisting 1+6+12. Multiple bundles of fine copper wires are twisted together to form the conductor 1. Water-blocking ropes are provided in the gaps between the multiple strands of conductors 1 to achieve longitudinal water-blocking capability and prevent water vapor from entering the cable from the joints. The water-blocking filling structure 2 is composed of multiple water-blocking ropes.

[0032] Furthermore, the flame retardant tape layer 3 is coated on the outer layer of the conductor 1 and the water-blocking filling structure 2, and the plurality of conductors 1 and the filled water-blocking filling structure 2 are solidified into a cable core with a circular cross-section.

[0033] The inner protective layer 4 is a polyethylene insulation layer extruded on the outer surface of the flame retardant tape layer 3 .

[0034] The metal sheath layer 5 is made of a lightweight aluminum thin layer, which is longitudinally overlapped and wrapped around the outer surface of the inner sheath, with an overlap rate of 25-35%.

[0035] The outer sheath layer 6 is made of halogen-free, low-smoke, flame-retardant cross-linked polyolefin insulation material and is extruded onto the outer wall of the metal sheath layer 5 .

[0036] Optionally, the inner protective layer 4 includes a cross-linked polyethylene insulation layer, and the outer sheath layer 5 includes a halogen-free, low-smoke, flame-retardant cross-linked polyolefin insulation layer.

[0037] In this way, by setting up the double insulation layer of the inner and outer sheaths, it can be ensured that the cable has good temperature resistance, can ensure that the cable can operate for a long time in a high temperature environment, and has good flame retardant and insulation properties.

[0038] Further, such as Figure 2 and Figure 3 As shown, the flame retardant wrapping tape layer 3 includes a first flame retardant wrapping tape layer formed by wrapping an inner wrapping tape 31 and a second flame retardant wrapping tape layer formed by wrapping an outer wrapping tape 33. The first flame retardant wrapping tape layer is located on the inner side of the second flame retardant wrapping tape layer, and the inner flame retardant wrapping tape layer 31 and the outer wrapping tape 33 include flame retardant wrapping tapes.

[0039] By providing two layers of flame-retardant tape, the conductors of the insulating layer on the outer layer of the conductor can be easily separated from each other, and the metal wire is not easily drawn into the cable insulation material during the separation process.

[0040] Furthermore, a flame retardant layer 32 is provided between the first flame retardant wrapping layer and the second flame retardant wrapping layer. The flame retardant layer 32 can be a talcum powder layer adhered to the acrylic adhesive surface coated on the surface of the mesh layer.

[0041] It should be understood that the talcum powder layer has good heat resistance and a small thermal expansion coefficient. It still has excellent stability and heat resistance at high temperatures, and can effectively protect the wires and structures inside the cable to prevent damage or failure caused by high temperatures. At the same time, talcum powder plays a lubricating and filling role between the first flame retardant tape layer, the second flame retardant tape layer and the inner protective layer, making it easy to strip the cable insulation material in the later stage, which is beneficial to the recycling of the insulation material.

[0042] In an optional embodiment, the inner wrapping tape 31 is wrapped in an opposite direction to the outer wrapping tape 33. The inner wrapping tape 31 has an overlap ratio of 30% to 50%, and the outer wrapping tape 33 has an overlap ratio of 20% to 30%.

[0043] In this way, the talcum powder layer is conducive to moving toward the inner protective layer, and the flame retardant tape layer 3 as a whole has a better flame retardant effect.

[0044] Furthermore, the inner wrapping tape 31 and the outer wrapping tape 33 both include a base layer and a mesh layer. The base layer is constructed in a sheet shape, and the mesh layer is constructed in a mesh shape. The mesh layer is adhered and fixed to the surface of the base layer, for example, by high-temperature resistant polypropylene glue.

[0045] As an optional embodiment, combining Figure 2 、 3 As shown, the inner wrapping tape 31 includes a first base layer 31a and a first mesh layer 31b, and the outer wrapping tape 33 includes a second base layer 33a and a second mesh layer 33b. The first mesh layer 31b and the second mesh layer 33b are arranged face to face, and the flame retardant layer 32 is arranged between the first mesh layer 31b and the second mesh layer 33b. Since the outer wrapping tape 33 is relatively sparsely wrapped, talcum powder can enter the inner side of the inner protective layer from the gaps in the outer wrapping tape 33.

[0046] Optionally, the inner wrapping tape 31 and the outer wrapping tape 33 include polyurethane tapes, with the polyurethane tapes serving as the base layer. The mesh layer is formed by processing depressions on the surface of the polyurethane tape by hot pressing or rolling, and talcum powder adhesion is achieved through the mesh layer.

[0047] In combination with the above embodiments, the utility model forms a conductor by twisting multiple bundles of fine copper wires, so that the cable has good bending performance, adopts double-layer insulation to ensure the cable's anti-aging, heat resistance and insulation performance, and arranges a flame-retardant tape layer between the conductor and the insulation layer to prevent the fine copper wire from breaking and puncturing the insulation. It is also beneficial to avoid adhesion of the fine copper wire and the insulation material when recycling the cable insulation material, making it easier to peel the insulation material from the cable, and carrying less metal impurities, which is beneficial to later environmentally friendly recycling and processing.

[0048] While the present invention has been described above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A high-temperature resistant XLPE insulated environmentally friendly power cable for energy storage system, characterized in that: include: Conductor (1) formed by twisting multiple layers; A water-blocking filling structure (2) is filled in the gaps between the plurality of conductors (1); A flame retardant tape layer (3) is coated on the outer layer of the conductor (1) and the water-blocking filling structure (2), and the plurality of conductors (1) and the filled water-blocking filling structure (2) are solidified into a cable core with a circular cross-section; An inner protective layer (4) is extruded onto the outer surface of the flame-retardant tape layer (3); A metal sheath layer (5) is longitudinally overlapped and wrapped around the outside of the inner sheath (4); An outer sheath layer (6) is extruded onto the outer wall of the metal sheath layer (5); The flame-retardant wrapping tape layer (3) includes a first flame-retardant wrapping tape layer formed by wrapping an inner wrapping tape (31) and a second flame-retardant wrapping tape layer formed by wrapping an outer wrapping tape (33), wherein the first flame-retardant wrapping tape layer is located on the inner side of the second flame-retardant wrapping tape layer; and both the inner wrapping tape (31) and the outer wrapping tape (33) are flame-retardant wrapping tapes; both the inner wrapping tape (31) and the outer wrapping tape (33) include a base layer and a mesh layer, wherein the base layer is constructed in a sheet shape, and the mesh layer is constructed in a mesh shape, and the mesh layer is adhered and fixed to the surface of the base layer.

2. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 1, characterized in that: The wrapping direction of the inner wrapping tape (31) is opposite to the wrapping direction of the outer wrapping tape (33).

3. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 1, characterized in that: The wrapping overlap rate of the inner wrapping tape (31) is 30% to 50%.

4. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 1, characterized in that: The outer wrapping tape (33) has a wrapping overlap rate of 20-30%.

5. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to any one of claims 1 to 4, characterized in that: A flame retardant layer (32) is provided between the first flame retardant tape layer and the second flame retardant tape layer.

6. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 5, characterized in that: The flame retardant layer (32) comprises a talcum powder layer adhered to the surface of the acrylic adhesive coated on the surface of the mesh layer.

7. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 1, characterized in that: The mesh layers of the inner wrapping tape (31) and the outer wrapping tape (33) are arranged face to face.

8. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 1, characterized in that: The conductor (1) comprises a plurality of bundles of fine copper wires (11), and water-blocking ropes are provided in the gaps between the plurality of conductors (1) to form longitudinal water blocking.

9. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 1, characterized in that: The inner protective layer (4) is a polyethylene insulation layer.

10. The high temperature resistant XLPE insulated environmentally friendly power cable for energy storage system according to claim 1, characterized in that: The outer sheath layer (6) comprises a halogen-free, low-smoke, flame-retardant cross-linked polyolefin insulation layer.

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