Halogen-free low-smoke flame-retardant battery connecting cable for electric energy storage system

Abstract

The utility model discloses a halogen-free low-smoke flame-retardant battery connecting cable for an electric power energy storage system, which comprises a cable core, the cable core comprises a plurality of conductors, each conductor comprises a core body, and an insulating layer, an insulating shielding layer and a braided reinforcing layer which are arranged outside the core body; an elastic body is arranged in the center of the plurality of conductors, a belting layer, a tensile layer, a fireproof layer and an outer protective layer are sequentially arranged on the outer side of each conductor from inside to outside, and a filling layer is arranged among the plurality of conductors in the belting layer. The cable provided by the utility model has the characteristics of flame retardance, no halogen, low smoke and no toxicity while meeting battery connection, the tensile strength of the cable is improved, the impact strength of the cable is improved, the problem of short circuit caused by damage of the cable core due to external force is prevented, the anti-electromagnetic interference capability of the cable is improved, and the service life of the cable is prolonged. Therefore, the service life of the cable is prolonged, the application range of the cable is widened, and the cable is simple in overall structure, reasonable in design and worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, specifically to a halogen-free low-smoke flame-retardant battery connection cable for a power energy storage system. Background Art

[0002] A power energy storage system is an equipment system that uses batteries as energy storage carriers and performs recyclable electrical energy storage and release through an inverter. Power energy storage refers to storing electrical energy and releasing it for power supply when needed. The basic principle of energy storage technology is to convert electrical energy into other forms of energy for storage and then convert it back into electrical energy for release. Currently, in the energy storage battery market, there are mainly three major application fields: power energy storage, household energy storage, and base station energy storage. Among them, the field of backup power supplies for communication base stations currently accounts for a relatively large proportion, accounting for nearly half of the entire energy storage battery market.

[0003] Most of the cables used in the existing market use copper cores as conductors. Due to the high cost of copper, it not only increases the processing cost of enterprises but also increases the usage cost of users. The demand for conductors using other materials to replace copper cores is increasing. Aluminum has advantages such as good electrical conductivity, light weight, and low price among metal materials. Therefore, it is an irresistible trend to replace copper-core cables with aluminum-core cables. The existing energy storage cables have a relatively simple composition structure, poor safety performance, and poor elastic tensile ability, thus affecting the usage range of the cables and having certain limitations.

[0004] After retrieval, the patent document with the authorization announcement number CN214956071U discloses an aluminum alloy flexible cable for a power energy storage system, and the patent document with the authorization announcement number CN215770632U discloses a battery connection sheath cable for a power energy storage system. From the content disclosed in the two retrieved patent documents, cables that meet the usage requirements are provided from different perspectives. In recent years, the power energy storage system has developed rapidly, and a large number of industrial and civil energy storage power station systems are used, requiring a large number of cables. In order to enhance the competitiveness of enterprises, meet market demands, increase market share, and based on safety and environmental protection requirements, a cable different from the existing technology is provided to meet the usage requirements. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a battery connection cable with a simple structure and stable performance in view of the problems in the background art. By using this battery connection cable, on the premise of meeting the halogen-free, low-smoke, and non-toxic characteristics, it can also avoid short-circuit problems caused by the damage of the wire core due to external forces during long-term use of the cable, improve its anti-electromagnetic interference ability, and thus meet the usage requirements of the power energy storage system. Specifically, it is a halogen-free low-smoke flame-retardant battery connection cable for a power energy storage system.

[0006] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system, comprising a cable core, wherein the cable core includes a plurality of conductors, and each conductor includes a core body, as well as an insulating layer, an insulating shielding layer and a braided strengthening layer provided outside the core body; an elastomer is arranged at the center of the plurality of conductors, and a tape layer, a tensile layer, a fireproof layer and an outer sheath are sequentially arranged outside the conductors from inside to outside, and a filling layer is arranged between the plurality of conductors within the tape layer.

[0007] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, there are six conductors, and the six conductors are arranged in an externally tangent state outside the elastomer. The core body is a sixth type of flexible aluminum alloy conductor. The insulating layer is extruded with a halogen-free and low-smoke flame-retardant polyethylene insulating material. The insulating shielding layer is extruded with a cross-linked semi-conductive shielding rubber. The braided strengthening layer is formed by cross-braiding tinned steel wires and fibers.

[0008] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, the tensile strength of a single aluminum alloy wire of the sixth type of flexible aluminum alloy conductor is ≥90 MPa, and the elongation at break is ≥8%.

[0009] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, a single aluminum alloy wire is prepared by stranding, multiple stranding and heat treatment of aluminum alloy single wires with a wire diameter of 0.15 - 0.2 mm.

[0010] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, the elastomer is formed by stranding bulletproof wires.

[0011] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, the filling layer is filled with halogen-free flame-retardant fiberglass ropes in the gaps between the plurality of conductors within the tape layer.

[0012] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, the tape layer is wound with a halogen-free and low-smoke flame-retardant tape.

[0013] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, the tensile layer is wound with glass fibers.

[0014] Further, for a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, the fireproof layer is extruded with a ceramized silicone rubber material.

[0015] Furthermore, a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model is adopted, and the outer sheath is a wear-resistant halogen-free and low-smoke flame-retardant polyolefin sheath.

[0016] By adopting a halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model, first, an elastomer is provided at the center of the cable core. By using the elastomer, not only can its tensile strength be enhanced, but also the weight of the cable can be greatly reduced; second, the core of the conductor is a sixth type of flexible aluminum alloy conductor. Compared with the existing copper cable, the aluminum alloy cable has the advantages of being lighter, more flexible, and more energy-saving, and its economy far exceeds that of the copper cable. Compared with a pure aluminum core cable, the aluminum alloy cable can overcome the disadvantages of poor mechanical properties, bending properties, anti-creep properties, and corrosion resistance of the aluminum core cable, thus becoming safer; third, a filling layer is provided between the conductors, and a tape layer, a tensile layer, a fireproof layer, and an outer sheath are provided outside the cable core. By adopting the above structure, while meeting the battery connection requirements, it not only has the characteristics of flame retardancy, halogen-free, low smoke, and non-toxicity, preventing a large amount of thick smoke and harmful halogen acid gases from being generated when the cable burns, but also ensures the safety of the staff.

[0017] It can be seen that by adopting the cable according to the present utility model, while greatly improving the bending performance, flame retardancy, and high and low temperature resistance of the cable, compared with the copper core energy storage system cable with a traditional structure, the service life of the cable is also greatly extended, and the cable weight is lighter than that of the original structure cable, and the procurement cost can be saved. It not only has excellent flame retardancy but also excellent bending performance.

[0018] In summary, by adopting the cable according to the present utility model, while meeting the battery connection requirements, it also has the characteristics of flame retardancy, halogen-free, low smoke, and non-toxicity, improves the tensile strength of the cable, increases the impact resistance strength of the cable, prevents short-circuit problems caused by the damage of the wire core due to external force, improves its anti-electromagnetic interference ability, extends the service life of the cable, thereby expanding the application range of the cable. The overall structure is simple and the design is reasonable, and it is worthy of popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic structural diagram of the present utility model.

[0021] As shown in the figure: 1 - conductor, 11 - core, 12 - insulating layer, 13 - insulating shielding layer, 14 - braided strengthening layer, 2 - elastomer, 3 - filling layer, 4 - tape layer, 5 - tensile layer, 6 - fireproof layer, 7 - outer sheath. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0023] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the conditions under which the present utility model can be implemented. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", etc. cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] It should be noted that the term "comprising" or any other variant is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0026] Such as Figure 1As shown in the figure, a halogen-free low-smoke flame-retardant battery connection cable for a power energy storage system according to the present utility model includes a cable core, the cable core includes a plurality of conductors 1, the conductor 1 includes a core body 11, and an insulating layer 12, an insulating shielding layer 13 and a braided strengthening layer 14 arranged outside the core body 11; an elastomer 2 is arranged at the center of the plurality of conductors 1, and a tape layer 4, a tensile layer 5, a fireproof layer 6 and an outer sheath layer 7 are sequentially arranged outside the conductor 1 from inside to outside, and a filling layer 3 is arranged between the plurality of conductors 1 in the tape layer 4. Among them, there are six conductors 1, and the six conductors 1 are arranged in an externally tangent state outside the elastomer 2, the core body 11 is a sixth type of flexible aluminum alloy conductor, the insulating layer 12 is extruded with a halogen-free low-smoke flame-retardant polyethylene insulating material, the insulating shielding layer 13 is extruded with a cross-linked semi-conductive shielding rubber, and the braided strengthening layer 14 is formed by cross-weaving tinned steel wires and fibers.

[0027] The utility model adopts a halogen-free, low-smoke, flame-retardant battery connection cable for an electric energy storage system. Since the core 11 is a sixth-type flexible aluminum alloy conductor, a high-speed wire bundler can be used to twist the wires during the specific preparation process. The twisting process ensures that there are no broken wires by adjusting the wire tension, the distance between the paralleling die and the distribution plate. The twisted wire core is re-twisted by the twisting machine. The number of wires can be divided into multiple strands according to the size of the cable cross-section. The number of finished conductors after re-twisting can reach multiple strands. The specific number can be determined according to the production needs. The sixth-type conductor is used, which can make the conductor more flexible and there is no breakage after repeated bending. After the finished conductor is heat-treated in a trolley aging furnace, the tensile strength of a single aluminum alloy wire is not less than 90MPa, and the elongation at break is not less than 8%. In addition, since an elastomer 2 is provided in the center of the conductor 1, a filling layer 3 is provided between the conductors 1, and a tape layer 4, a tensile layer 5, a fireproof layer 6 and an outer sheath 7 are provided on the outside of the conductor 1, the elastomer 2 is formed by hinged bulletproof wire, and the use of bulletproof wire can enhance the tensile strength of the conductor; the filling layer 3 is filled with halogen-free flame-retardant glass wire rope in the gaps between the multiple conductors 1 in the tape layer 4, and the use of halogen-free flame-retardant glass wire rope can enhance its flame retardant effect; the tape layer 4 is wrapped with halogen-free low-smoke flame-retardant tape, which can Further enhancing its flame retardant effect; the tensile layer 5 is formed by wrapping glass fiber, which can further enhance its tensile effect; the fireproof layer 6 is formed by extruding ceramic silicone rubber material. Ceramic silicone rubber material is a new type of polymer refractory material with excellent fire resistance, flame retardancy, low smoke, and non-toxic properties. The extrusion molding process is simple. The residue after combustion is a hard ceramic shell. The hard shell does not melt or drip in a fire environment. The hard shell after combustion provides excellent protection for the circuit. It can pass the line integrity test specified in GB / T19216.21-2003 at a temperature of 950℃-1000℃, fire for 90 minutes, and cooling for 15 minutes. It is suitable for any place requiring fire protection and plays a solid protective role in ensuring smooth power transmission in the event of a fire. At the same time, since ceramic silicone rubber products have no special requirements for equipment and the processing technology is simple, they can be produced using traditional silicone rubber processing equipment. Compared with the current fire-resistant wire and cable production technology, they have higher production efficiency and can reduce production energy consumption and save costs. The outer protective layer 7 is a wear-resistant halogen-free, low-smoke, flame-retardant polyolefin sheath, which can enhance its wear resistance while meeting the requirements of halogen-free, low-smoke, and flame-retardant properties.

[0028] It can be seen that by adopting the cable of the present utility model, while greatly improving the bending performance, flame retardant performance, and high and low temperature resistance performance of the cable, compared with the copper core energy storage system cable with a traditional structure, the service life of the cable is also greatly extended, and the weight of the cable is lighter than that of the original structure cable, which can save the procurement cost. It not only has excellent flame retardant performance but also excellent bending performance, making it have the characteristics of flame retardancy, halogen-free, low smoke, and non-toxicity, preventing a large amount of thick smoke and harmful halogen acid gas problems from being generated when the cable burns.

[0029] In summary, by adopting the cable of the present utility model, while meeting the battery connection, it also has the characteristics of flame retardancy, halogen-free, low smoke, and non-toxicity, improves the tensile strength of the cable, increases the impact strength of the cable, prevents the short circuit problem caused by the damage of the wire core due to external force, extends the service life of the cable, thereby expanding the scope of use of the cable. The overall structure is simple and the design is reasonable, which is worthy of popularization and use.

[0030] Other details not elaborated in the present utility model are all well-known conventional technologies in the art.

[0031] The protection scope of the present utility model is not limited to the technical solutions disclosed in the specific embodiments. The above is only the preferred embodiment of the present utility model and does not limit the present utility model. Any minor modification, equivalent replacement, and improvement made based on the technical solution of the present utility model shall be included in the protection scope of the technical solution of the present utility model.

Claims

1. A halogen-free low-smoke flame-retardant battery connection cable for a power energy storage system, comprising a cable core, and the cable core includes a plurality of conductors (1), characterized in that: The conductor (1) includes a core (11), and an insulating layer (12), an insulating shielding layer (13) and a braided strengthening layer (14) provided outside the core (11); an elastomer (2) is provided at the center of a plurality of the conductors (1), and a tape layer (4), a tensile layer (5), a fireproof layer (6) and an outer sheath layer (7) are sequentially provided outside the conductor (1) from inside to outside, and a filling layer (3) is provided between a plurality of conductors (1) within the tape layer (4).

2. The halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to claim 1, wherein: There are six conductors (1), and the six conductors (1) are arranged in an externally tangent state outside the elastomer (2). The core (11) is a sixth type of flexible aluminum alloy conductor. The insulating layer (12) is extruded with a halogen-free low-smoke flame-retardant polyethylene insulating material. The insulating shielding layer (13) is extruded with a crosslinked semi-conductive shielding rubber. The braided strengthening layer (14) is formed by cross-braiding tinned steel wires and fibers.

3. The halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to claim 2, wherein: The tensile strength of a single aluminum alloy wire of the sixth type of flexible aluminum alloy conductor is ≥90 MPa, and the elongation at break is ≥8%.

4. The halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to claim 3, wherein: The single aluminum alloy wire is prepared by stranding, double-stranding and heat treatment of aluminum alloy single wires with a wire diameter of 0.15 - 0.2 mm.

5. A halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system, characterized in that: The elastomer (2) is formed by stranding bulletproof wires.

6. The halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to claim 1, wherein: The filling layer (3) is filled with halogen-free flame-retardant glass fiber ropes in the gaps between a plurality of conductors (1) within the tape layer (4).

7. A halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system, characterized in that: The tape layer (4) is wound with a halogen-free low-smoke flame-retardant tape.

8. A halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system, characterized in that: The tensile layer (5) is wound with glass fibers.

9. The halogen-free and low-smoke flame-retardant battery connection cable for a power energy storage system according to claim 1, wherein: The fireproof layer (6) is extruded with a ceramized silicone rubber material.

10. The halogen-free low-smoke flame-retardant battery connection cable for a power energy storage system according to claim 1, characterized in that: The outer sheath layer (7) is a wear-resistant halogen-free low-smoke flame-retardant polyolefin sheath.

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