High-temperature radiation resistant crosslinked halogen-free flame-retardant automobile wire assembly and processing technology thereof

Abstract

The application belongs to the technical field of automobile wire harness cables, and particularly discloses a high-temperature radiation cross-linked halogen-free flame-retardant automobile wire assembly and a processing technology thereof, wherein the automobile wire assembly comprises a soft conductor, a radiation cross-linked halogen-free flame-retardant insulation layer, a halogen-free flame-retardant filling layer, a shielding tape layer and a radiation cross-linked halogen-free flame-retardant outer sheath layer; the radiation cross-linked halogen-free flame-retardant insulation layer and the outer sheath layer are both made of an electron beam radiation cross-linked halogen-free polyolefin cable material; and one end of the soft conductor is crimped with a copper nose for connection. The full-length T-shaped protrusion of the insulation layer is integrally extruded, a through-type air-permeable heat dissipation gap is formed between the insulation layer and the filling layer, and the cable core heat is continuously led out by relying on air convection, so that internal heat accumulation is avoided and insulation aging is accelerated; the insulation layer and the outer sheath are both made of an electron beam radiation cross-linked halogen-free polyolefin material, can long-term resist 150 DEG C high temperature, have no halogen, produce low-smoke non-corrosive toxic smoke during combustion, and meet the safety specifications of new energy vehicles.

Description

Technical Field

[0001] This invention belongs to the field of automotive wiring harness and cable technology, and particularly relates to a high-temperature irradiation cross-linked halogen-free flame-retardant automotive wiring assembly and its processing technology. Background Technology

[0002] With the rapid development of new energy vehicles and high-performance gasoline vehicles, the operating temperature inside the engine compartment and battery pack continues to rise, gradually highlighting the defects of traditional automotive cables: Ordinary PVC automotive cables contain halogens, are prone to softening and deformation at high temperatures, release corrosive toxic fumes from burning hydrogen chloride, and the insulation layer ages and cracks after long-term use at high temperatures, which can easily cause short circuits; conventional polyolefin cables are not cross-linked and have a temperature resistance of only 80-105℃, which cannot withstand the long-term high temperature of over 125℃ in the engine compartment. The existing halogen-free automotive cables have a smooth internal structure, and the multi-layered cables have poor heat dissipation. Prolonged high-temperature operation leads to heat accumulation, which accelerates insulation failure. The cable ends are connected to the vehicle's electrical system via copper lugs. The copper lug connection point is a point where current is concentrated and heat is generated. There is no conventional protective structure, so the heat cannot be dissipated quickly. Overheating can easily ignite the cable sheath. There is also a lack of emergency fire extinguishing structure. Once a short circuit occurs at the connection point and a fire breaks out, the fire will spread rapidly along the wiring harness.

[0003] Therefore, it is necessary to invent a high-temperature irradiation-resistant cross-linked halogen-free flame-retardant automotive wire assembly and its processing technology to solve the above problems. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a high-temperature irradiation-resistant cross-linked halogen-free flame-retardant automotive wire assembly and its processing technology, thereby solving one of the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature irradiated cross-linked halogen-free flame-retardant automotive wiring harness assembly, comprising, from the inside out, a soft conductor, an irradiated cross-linked halogen-free flame-retardant insulation layer, a halogen-free flame-retardant filling layer, a shielding wrapping layer, and an irradiated cross-linked halogen-free flame-retardant outer sheath layer. Both the irradiated cross-linked halogen-free flame-retardant insulation layer and the outer sheath layer are made of halogen-free polyolefin cable material formed by electron beam irradiation cross-linking. One end of the soft conductor is crimped with a copper lug for connection, and a protective component is detachably sleeved on the end of the irradiated cross-linked halogen-free flame-retardant outer sheath layer near the copper lug.

[0006] Furthermore, the protective component includes a protective sleeve, with a rubber sealing ring fixedly connected to the end of the protective sleeve away from the copper lug, and a metal connecting piece connected to the end of the protective sleeve near the copper lug, and the metal connecting piece having a connecting hole that matches the hole of the copper lug. The top and bottom of the protective sleeve are respectively provided with a heat dissipation mechanism and a fire extinguishing mechanism for heat dissipation and fire extinguishing of the automotive wiring assembly.

[0007] Furthermore, the heat dissipation mechanism includes an arc-shaped heat dissipation plate, which is hollow and filled with coolant. The heat dissipation plate is fixedly connected to the top of the protective sleeve. Multiple elastic sheets are evenly distributed axially at the bottom of the heat dissipation plate. A strip-shaped hole is opened through the protective sleeve at the position directly opposite the elastic sheet. The elastic sheet passes through the strip-shaped hole and is bonded to the irradiated cross-linked halogen-free flame-retardant outer sheath layer.

[0008] Furthermore, the fire extinguishing mechanism includes a mounting cover, which is fixedly connected to the bottom of the protective sleeve. A high-pressure airbag is provided inside the mounting cover, and the high-pressure airbag is filled with dry powder extinguishing agent. Several powder spraying holes are evenly opened through the area at the bottom of the protective sleeve that is directly opposite the mounting cover. Several heat-conducting wires are also evenly arranged at the bottom of the protective sleeve. The heat-conducting wires are connected together with metal connecting pieces, and the heat-conducting wires are always in contact with the high-pressure airbag.

[0009] Furthermore, the top of the heat sink has several heat dissipation protrusions evenly distributed along its axis, and the length of the heat dissipation protrusions matches the length of the heat sink.

[0010] Furthermore, the surface of the irradiated cross-linked halogen-free flame-retardant insulation layer has several T-shaped protrusions evenly distributed in a ring along the axial direction, and the length of the T-shaped protrusions matches the length of the irradiated cross-linked halogen-free flame-retardant insulation layer.

[0011] Furthermore, an isolation ring is fixedly fitted to one end of the protective sleeve near the copper nose, and the isolation ring is made of insulating material.

[0012] Furthermore, the surface of the soft conductor is provided with a tin-plated layer, and the soft conductor is made of multiple strands of oxygen-free copper monofilaments twisted in reverse.

[0013] Furthermore, a breathable and heat-dissipating gap is formed between two adjacent T-shaped protrusions, and the T-shaped protrusions and the irradiated cross-linked halogen-free flame-retardant insulation layer are integrally extruded structures.

[0014] This invention also discloses a processing technology for high-temperature irradiation crosslinking halogen-free flame-retardant automotive wire components, comprising the following steps: Step 1: Conductor preparation. Multiple strands of high-purity oxygen-free copper monofilaments are bundled in multiple layers in reverse. The bundled soft conductor is rounded, annealed, and surface cleaned to ensure that the conductor has a uniform outer diameter and is free of oxide burrs. Step 2: Insulation layer extrusion molding. A halogen-free polyolefin cable material is integrally extruded onto the outside of the soft conductor using an extruder to form an irradiated cross-linked halogen-free flame-retardant insulation layer with a T-shaped protrusion structure. Step 3: Cable forming and covering treatment. After filling the outside of the insulation layer with a halogen-free flame-retardant filler layer and covering it with a shielding tape layer, the irradiated cross-linked halogen-free flame-retardant outer sheath layer is extruded to obtain the formed cable body. Step 4: Electron beam irradiation crosslinking. The entire cable is subjected to electron beam irradiation treatment to complete the crosslinking reaction between the insulation layer and the outer sheath layer, thereby improving the cable's temperature resistance, flame retardancy, and mechanical properties. Step 5: End assembly and processing. Crim the copper lug to one end of the cable and detachably fit a protective sleeve on the end of the outer sheath. Then, assemble the rubber sealing ring, insulating isolation ring, and fix the metal connecting piece, heat dissipation mechanism and fire extinguishing mechanism in sequence. Step Six: Inspection and Warehousing. The finished cables undergo a full range of tests, including insulation performance, heat resistance, flame retardancy, heat dissipation and fire extinguishing triggering performance, and assembly sealing. Once qualified, they are put into storage.

[0015] The technical effects and advantages of this invention are as follows: 1. The present invention features an integrally extruded full-length T-shaped protrusion in the insulation layer, forming a through-type breathable heat dissipation gap between the insulation layer and the filler layer. This allows for continuous heat dissipation from the cable core through air convection, preventing internal heat accumulation and accelerated insulation aging. Both the insulation layer and the outer sheath are made of electron beam irradiated cross-linked halogen-free polyolefin material, which can withstand high temperatures of 150°C for a long time. It is halogen-free, produces low smoke and no corrosive toxic fumes during combustion, and meets the safety standards for new energy vehicles. 2. This invention incorporates protective components. The heat dissipation mechanism relies on elastic sheets to directly absorb heat from the cable sheath and directs the heat to a hollow heat dissipation plate with built-in coolant. Combined with the top elongated heat dissipation protrusion to increase the air heat exchange area, it continuously removes the heat concentrated at the copper lug, effectively reducing the operating temperature of the terminal block and preventing the sheath from hardening and the terminal block from oxidizing and loosening due to long-term high temperatures. When the copper lug is overloaded or short-circuited and generates sudden heat, the heat is quickly transferred to the high-pressure airbag through the metal connecting piece and heat-conducting wire. After the airbag ruptures due to heat, dry powder extinguishing agent is sprayed out from the powder spraying hole to cover the ignition point, quickly extinguishing the flame and preventing the fire from spreading widely along the wiring harness. This solves the defect of traditional wiring harness terminal fires without emergency protection.

[0016] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0018] Figure 1 This is a schematic diagram of the first overall structure of the present invention; Figure 2 In this invention Figure 1 Enlarged view of part A; Figure 3 This is a schematic diagram of the second overall structure of the present invention; Figure 4 In this invention Figure 3 Enlarged view of part B; Figure 5 This is a first perspective view of the protective component in this invention; Figure 6 This is a second perspective view of the protective component in this invention; Figure 7 This is a three-dimensional schematic diagram of the heat sink in this invention; Figure 8 This is a three-dimensional schematic diagram of the mounting cover and high-pressure airbag in this invention; Figure 9 This is a three-dimensional schematic diagram of the protective sleeve in this invention.

[0019] In the diagram: 1. Soft conductor; 2. Irradiated cross-linked halogen-free flame-retardant insulation layer; 3. Halogen-free flame-retardant filler layer; 4. Shielding tape layer; 5. Irradiated cross-linked halogen-free flame-retardant outer sheath layer; 6. Copper lug; 7. Protective sleeve; 8. Rubber sealing ring; 9. Metal connecting piece; 10. Heat sink plate; 11. Elastic sheet; 12. Strip hole; 13. Mounting cover; 14. High-pressure airbag; 15. Powder spraying hole; 16. Heat-conducting wire; 17. Heat dissipation protrusion; 18. T-shaped protrusion; 19. Isolation ring. Detailed Implementation

[0020] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This invention provides, for example Figures 1 to 9 The high-temperature irradiated cross-linked halogen-free flame-retardant automotive wiring harness assembly shown comprises, from the inside out, a soft conductor 1, an irradiated cross-linked halogen-free flame-retardant insulation layer 2, a halogen-free flame-retardant filling layer 3, a shielding wrapping layer 4, and an irradiated cross-linked halogen-free flame-retardant outer sheath layer 5. Both the irradiated cross-linked halogen-free flame-retardant insulation layer 2 and the outer sheath layer are made of halogen-free polyolefin cable material formed by electron beam irradiation cross-linking. One end of the soft conductor 1 is crimped with a copper lug 6 for connection. The irradiated cross-linked halogen-free flame-retardant outer sheath layer 5 is detachably sleeved with a protective component at the end near the copper lug 6. The surface of the soft conductor 1 is provided with a tin-plated layer, and the soft conductor 1 is made of multiple strands of oxygen-free copper monofilaments twisted in reverse. The protective component includes a protective sleeve 7. A rubber sealing ring 8, coaxial with the protective sleeve 7, is fixedly connected to the end of the protective sleeve 7 away from the copper lug 6. A metal connecting piece 9 is connected to the end of the protective sleeve 7 close to the copper lug 6. The metal connecting piece 9 has a connecting hole that matches the hole of the copper lug 6. A heat dissipation mechanism and a fire extinguishing mechanism are respectively provided at the top and bottom of the protective sleeve 7 for heat dissipation and fire extinguishing of the automotive wiring assembly. The heat dissipation mechanism includes an arc-shaped heat dissipation plate 10, which is hollow and filled with coolant. The heat dissipation plate 10 is fixedly connected to the top of the protective sleeve 7. Multiple elastic sheets 11 are evenly distributed axially on the bottom of the heat dissipation plate 10. A strip hole 12 is opened through the protective sleeve 7 at the position directly opposite the elastic sheet 11. The elastic sheet 11 passes through the strip hole 12 and is bonded to the irradiated cross-linked halogen-free flame-retardant outer sheath layer 5. Several heat dissipation protrusions 17 are evenly distributed axially on the top of the heat dissipation plate 10, and the length of the heat dissipation protrusions 17 matches the length of the heat dissipation plate 10. The fire extinguishing mechanism includes a mounting cover 13, which is fixedly connected to the bottom of the protective sleeve 7. A high-pressure airbag 14 is provided inside the mounting cover 13, and the high-pressure airbag 14 is filled with dry powder extinguishing agent. Several powder spraying holes 15 are evenly opened in the area directly opposite the mounting cover 13 at the bottom of the protective sleeve 7. Several heat-conducting wires 16 are also evenly arranged at the bottom of the protective sleeve 7. The heat-conducting wires 16 are connected together with the metal connecting piece 9. When the mounting cover 13 is assembled onto the protective sleeve 7, the high-pressure airbag 14 inside can be stably pressed together with the heat-conducting wires 16 under the pressure of the mounting cover 13. An isolation ring 19 is fixedly sleeved at the end of the protective sleeve 7 near the copper lug 6, and the isolation ring 19 is made of insulating material. When the cable is working normally, the current is transmitted through the soft conductor 1, which is tin-plated on the surface and formed by multiple strands of oxygen-free copper monofilaments twisted in reverse. In the multi-layer structure, the insulation layer and the outer sheath rely on the cross-linked halogen-free polyolefin substrate irradiated by electron beam to achieve high temperature resistance of 150℃, halogen-free low smoke flame retardant protection. The T-shaped protrusion 18 on the outside of the insulation layer forms a heat dissipation gap to assist the cable core in heat dissipation. The shielding wrapping layer 4 isolates vehicle electromagnetic interference. The cable end with concentrated current is connected to the vehicle's electrical system through the copper lug 6. The protective component that can be detached and sleeved on the end of the sheath relies on the rubber sealing ring 8 to achieve anti-slip sealing by interfering with the sheath. The insulating isolation ring 19 isolates the metal connecting piece 9 to prevent leakage. The metal connecting piece 9 is locked and fixed to the protective sheath 7 synchronously with the copper lug 6 through the matching hole. During operation, the copper lug 6 connection point continuously generates heat. Part of the heat is conducted to the bottom heat conduction wire 16 through the metal connecting piece 9, and the other part is directly transferred by the outer sheath of the cable to the elastic piece 11 that passes through the strip hole 12 of the protective sleeve 7 and is in close contact with the outer wall of the sheath. The elastic piece 11 guides the heat into the hollow arc-shaped heat dissipation plate 10 filled with coolant. The heat dissipation protrusions 17 distributed along the entire length of the top of the heat dissipation plate 10 increase the contact area with air, and together with the coolant, the terminal is quickly and continuously cooled by air, suppressing the heat accumulation and temperature rise of the terminal. In the event of an overload or short circuit, a rapid increase in temperature occurs at the copper lug 6. This high temperature is quickly conducted through the metal connecting piece 9 and the heat-conducting wire 16 to the high-pressure airbag 14, which is fitted inside the mounting cover 13. The high-pressure airbag 14 expands and ruptures due to the heat, and the dry powder extinguishing agent inside is sprayed outward through the powder spraying hole 15 at the bottom of the protective sleeve 7. This fully covers the fire area at the end of the cable, quickly extinguishes the flames, and prevents the fire from spreading along the cable harness. This achieves a dual safety protection effect of continuous heat dissipation under normal cable operating conditions and automatic fire extinguishing in case of a fault.

[0021] like Figure 1 and Figure 2 As shown, the surface of the irradiated cross-linked halogen-free flame-retardant insulation layer 2 is uniformly distributed with several T-shaped protrusions 18 in an axial ring. The length of the T-shaped protrusions 18 matches the length of the irradiated cross-linked halogen-free flame-retardant insulation layer 2. A breathable heat dissipation gap is formed between two adjacent T-shaped protrusions 18. The T-shaped protrusions 18 and the irradiated cross-linked halogen-free flame-retardant insulation layer 2 are integrally extruded structures. When the cable is working, the internal soft conductor 1 is energized and continuously heats up. The heat is transferred outward to the irradiated cross-linked halogen-free flame-retardant insulation layer 2. The outer wall of the insulation layer is uniformly arranged in a ring along the axial direction and is extruded in one piece with the insulation layer. The T-shaped protrusions 18 are formed in a ring along the entire length of the cable. They separate the insulation layer from the outer halogen-free flame-retardant filling layer 3. A breathable heat dissipation gap is formed between adjacent T-shaped protrusions 18 that runs through the entire length of the cable. Air can circulate freely in the gap, continuously carrying away the heat accumulated on the outer wall of the insulation layer. This effectively prevents heat accumulation inside the cable core and slows down the high-temperature aging, softening and damage of the insulation layer. Meanwhile, the T-shaped protrusion 18 and the insulation layer are integrally molded structures, and the two are tightly bonded without any delamination gaps, resulting in higher heat transfer efficiency and better overall structural strength. Under conditions such as vehicle vibration and wire harness bending and compression, there will be no protrusion falling off or cracking. It can stably maintain the heat dissipation channel for a long time and continuously improve the overall high-temperature resistance performance of the cable.

[0022] This invention also discloses a processing technology for high-temperature irradiation crosslinking halogen-free flame-retardant automotive wire components, comprising the following steps: Step 1: Conductor preparation. Multiple strands of high-purity oxygen-free copper monofilaments are bundled in multiple layers in reverse. The bundled soft conductor 1 is rounded, annealed and surface cleaned to ensure that the conductor has a uniform outer diameter and is free of oxidation burrs. Step 2: Insulation layer extrusion molding. Using halogen-free polyolefin cable material, an irradiated cross-linked halogen-free flame-retardant insulation layer 2 with a T-shaped protrusion 18 structure is integrally extruded on the outside of the soft conductor 1 through an extruder. Step 3: Cable forming and covering treatment. After filling the outside of the insulation layer with halogen-free flame-retardant filler layer 3 and covering with shielding tape layer 4, the irradiated cross-linked halogen-free flame-retardant outer sheath layer 5 is extruded to obtain the formed cable body. Step 4: Electron beam irradiation crosslinking. The entire cable is subjected to electron beam irradiation treatment to complete the crosslinking reaction between the insulation layer and the outer sheath layer, thereby improving the cable's temperature resistance, flame retardancy, and mechanical properties. During electron beam irradiation treatment, the irradiation dose is 100-130 kGy, the electron beam energy is 1.5-3.0 MeV, and the beam current intensity is 10-20 mA. Step 5: End assembly and processing. Crim the copper lug 6 to one end of the cable. The protective sleeve 7 is detachably fitted onto the end of the outer sheath. Then, assemble the rubber sealing ring 8, the insulating isolation ring 19, and fix the metal connecting piece 9, the heat dissipation mechanism, and the fire extinguishing mechanism in sequence. Step Six: Inspection and Warehousing. The finished cables undergo a full range of tests, including insulation performance, heat resistance, flame retardancy, heat dissipation and fire extinguishing triggering performance, and assembly sealing. Once qualified, they are put into storage.

[0023] Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0024] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0026] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0027] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A high-temperature irradiation-resistant, halogen-free, flame-retardant automotive wiring harness assembly, characterized in that, From the inside out, it includes a soft conductor (1), an irradiated cross-linked halogen-free flame-retardant insulation layer (2), a halogen-free flame-retardant filling layer (3), a shielding wrapping layer (4), and an irradiated cross-linked halogen-free flame-retardant outer sheath layer (5). One end of the soft conductor (1) is crimped with a copper lug (6) for connection. The irradiated cross-linked halogen-free flame-retardant outer sheath layer (5) near the copper lug (6) is detachably fitted with a protective component. The protective assembly includes a protective sleeve (7), with a rubber sealing ring (8) fixedly connected to the end of the protective sleeve (7) away from the copper lug (6) and a metal connecting piece (9) connected to the end of the protective sleeve (7) near the copper lug (6), and the metal connecting piece (9) has a connecting hole that matches the hole of the copper lug (6). The top and bottom of the protective sleeve (7) are respectively provided with a heat dissipation mechanism and a fire extinguishing mechanism for heat dissipation and fire extinguishing of the automotive wiring assembly.

2. The high-temperature irradiation crosslinking halogen-free flame-retardant automotive wiring harness according to claim 1, characterized in that: The irradiated cross-linked halogen-free flame-retardant insulation layer (2) and the outer sheath layer are both made of halogen-free polyolefin cable material formed by electron beam irradiation cross-linking.

3. The high-temperature irradiation cross-linked halogen-free flame-retardant automotive wiring harness assembly according to claim 2, characterized in that: The heat dissipation mechanism includes an arc-shaped heat dissipation plate (10), which is hollow and filled with coolant. The heat dissipation plate (10) is fixedly connected to the top of the protective sleeve (7). Multiple elastic sheets (11) are evenly distributed axially at the bottom of the heat dissipation plate (10). A strip hole (12) is opened through the protective sleeve (7) and the elastic sheet (11) at the position directly opposite. The elastic sheet (11) passes through the strip hole (12) and is bonded to the irradiated crosslinked halogen-free flame-retardant outer sheath layer (5).

4. The high-temperature irradiation cross-linked halogen-free flame-retardant automotive wiring harness assembly according to claim 3, characterized in that: The fire extinguishing mechanism includes a mounting cover (13), which is fixedly connected to the bottom of the protective sleeve (7). A high-pressure airbag (14) is provided inside the mounting cover (13), and the high-pressure airbag (14) is filled with dry powder extinguishing agent. Several powder spraying holes (15) are evenly opened in the area directly opposite the mounting cover (13) at the bottom of the protective sleeve (7). Several heat-conducting wires (16) are also evenly arranged at the bottom of the protective sleeve (7). The heat-conducting wires (16) are connected to the metal connecting piece (9), and the heat-conducting wires (16) are always in contact with the high-pressure airbag (14).

5. The high-temperature irradiation cross-linked halogen-free flame-retardant automotive wiring harness assembly according to claim 4, characterized in that: The top of the heat sink (10) has a number of heat dissipation protrusions (17) evenly distributed along the axial direction, and the length of the heat dissipation protrusions (17) matches the length of the heat sink (10).

6. The high-temperature irradiation cross-linked halogen-free flame-retardant automotive wiring harness according to claim 1, characterized in that: The surface of the irradiated cross-linked halogen-free flame-retardant insulation layer (2) has a number of T-shaped protrusions (18) evenly distributed in a ring along the axial direction. The length of the T-shaped protrusions (18) matches the length of the irradiated cross-linked halogen-free flame-retardant insulation layer (2).

7. The high-temperature irradiation cross-linked halogen-free flame-retardant automotive wire assembly according to claim 6, characterized in that: The protective sleeve (7) has an isolation ring (19) fixedly fitted at one end near the copper nose (6), and the isolation ring (19) is made of insulating material.

8. The high-temperature irradiation cross-linked halogen-free flame-retardant automotive wire assembly according to claim 7, characterized in that: The surface of the soft conductor (1) is provided with a tin-plated layer, and the soft conductor (1) is made of multiple strands of oxygen-free copper monofilaments twisted in reverse.

9. The high-temperature irradiation cross-linked halogen-free flame-retardant automotive wiring harness according to claim 8, characterized in that: A breathable heat dissipation gap is formed between two adjacent T-shaped protrusions (18), and the T-shaped protrusions (18) and the irradiated crosslinked halogen-free flame-retardant insulation layer (2) are integrally extruded structures.

10. The processing technology of the high-temperature irradiation crosslinking halogen-free flame-retardant automotive wire assembly according to claim 9, characterized in that: Includes the following steps: Step 1: Conductor preparation. Multiple strands of high-purity oxygen-free copper monofilaments are bundled in multiple layers in reverse. The bundled soft conductor (1) is rounded, annealed and surface cleaned to ensure that the conductor has a uniform outer diameter and no oxidation burrs. Step 2: Insulation layer extrusion molding. A halogen-free polyolefin cable material is extruded integrally on the outside of the soft conductor (1) using an extruder to form an irradiated cross-linked halogen-free flame-retardant insulation layer (2) with a T-shaped protrusion (18) structure. Step 3: Cable forming and covering treatment. After filling the outside of the insulation layer with a halogen-free flame-retardant filler layer (3) and covering with a shielding tape layer (4), the cable body is extruded and formed into an irradiated cross-linked halogen-free flame-retardant outer sheath layer (5) to obtain the formed cable body. Step 4: Electron beam irradiation crosslinking. The entire cable is subjected to electron beam irradiation treatment to complete the crosslinking reaction between the insulation layer and the outer sheath layer, thereby improving the cable's temperature resistance, flame retardancy, and mechanical properties. Step 5: End assembly and processing. Crim the copper lug (6) to one end of the cable. A protective sleeve (7) is detachably fitted onto the end of the outer sheath. Then, assemble the rubber sealing ring (8), the insulating isolation ring (19), and fix the metal connecting piece (9), the heat dissipation mechanism, and the fire extinguishing mechanism in sequence. Step Six: Inspection and Warehousing. The finished cables undergo a full range of tests, including insulation performance, heat resistance, flame retardancy, heat dissipation and fire extinguishing triggering performance, and assembly sealing. Once qualified, they are put into storage.

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