Self-temperature-limiting high-temperature-resistant heat tracing band

Abstract

The invention discloses a self-temperature-limiting high-temperature-resistant heat tracing band, relates to the field of heat tracing bands, and aims to solve the problems that a PTC (Positive Temperature Coefficient) high-molecular heating material is not resistant to high temperature and is extremely easy to burn out when being used for preheating or warming a high-temperature boiler pipeline, and the key point of the technical scheme is that a positive temperature coefficient thermosensitive metal wire is adopted, so that the high-temperature-resistant heat tracing band is resistant to the high temperature of 300 DEG C or above; and the heating power is dynamically adjusted in a self-temperature-limiting manner to keep the temperature constantly.

Description

Technical Field

[0001] The invention relates to the technical field of self-limiting temperature heating belts, in particular to a self-limiting temperature-resistant high-temperature heating belt. Background Art

[0002] Electric heating tape is a new type of high-tech product. Since it entered the application field in the 1970s, self-limiting electric heating tape has become the most common type of electric heating tape in the world today. They can be widely used in the transportation of liquid objects in pipelines and the antifreeze and heat preservation of tanks, maintaining process temperature, heating roads, ramps, crosswalks, eaves and floors, etc. Inside the basic self-limiting electric heating tape, PTC polymer materials for heating are distributed between the two conductive cores, and the outside is composed of a polymer insulation layer. When the power is turned on, the internal PTC polymer material expands due to heat, the resistance increases, the heating power is reduced, and the temperature is lowered; when the temperature drops, the internal PTC polymer material contracts when it is cold, the resistance decreases, the heating power is increased, and the temperature rises, thereby achieving the effect of automatically adjusting the temperature.

[0003] When the electric heating belt is working, it heats a certain system. If the heat transferred by the electric heating belt to the system per unit time is equal to the heat transferred by the system to the external environment, the temperature of the system remains unchanged. The highest temperature that the system can reach is called the maximum maintenance temperature.

[0004] There is a heating tape made of PTC polymer heating material for self-limiting temperature electric heating tape with patent number CN201210057535.3. Since the PTC polymer heating material used is not resistant to high temperatures, it will easily melt and short-circuit when the temperature reaches 200 degrees Celsius. It is very easy to burn when used for preheating or warming of high-temperature boiler pipes. Therefore, a heat-resistant heating tape that can withstand 300°C high temperatures is needed. Summary of the invention

[0005] The purpose of the present invention is to provide a self-limiting temperature resistant high temperature heating belt.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] It includes a high-temperature resistant battery cell group containing two conductors, the battery cell group is wrapped with a heat-resistant insulation layer, the heat-resistant insulation layer is wrapped with a glass fiber braided layer, the glass fiber braided layer is covered with a plurality of spirally wound groups of self-limiting temperature PTC heaters, the self-limiting temperature PTC heaters are arranged in sections along the length direction of the high-temperature resistant battery cell group, both ends of the self-limiting temperature PTC heaters are inserted into the high-temperature resistant battery cell group to electrically connect different conductors, the self-limiting temperature PTC heater includes a thermistor metal wire with a positive temperature coefficient and a glass fiber yarn, the thermistor metal wire is spirally wound along the length direction of the glass fiber yarn, the glass fiber yarn is spirally wound around the high-temperature resistant battery cell group, the glass fiber braided layer is wrapped with a glass fiber mesh fixing the self-limiting temperature PTC heater, the glass fiber mesh is wrapped with a fire-resistant insulation layer, the fire-resistant insulation layer is wrapped with a soft shell protective layer, and the soft shell protective layer is wrapped with a hard shell protective layer.

[0008] Furthermore, the conductors are arranged in pairs and at intervals inside the high-temperature resistant battery cell group, the outer wall of the conductor is wrapped with a heat-resistant insulation layer, the heat-resistant insulation layer is wrapped with a fire-resistant insulation layer, and the conductor is one of pure nickel or a nickel alloy.

[0009] Furthermore, the heat-resistant insulating layer is made of a high-temperature resistant polyimide material prepared by a two-step process using phthalic anhydride, bisether dianhydride and p-phenylenediamine, and the fire-resistant insulating layer is a 2-3 layer wrapped glass fiber composite mica tape.

[0010] By adopting the above technical scheme, high temperature resistant polyimide is an excellent high temperature resistant insulating material, which is very suitable for the insulating layer of the conductor. The glass fiber composite mica tape is made of synthetic mica paper as the base material, glass fiber cloth as the double-sided reinforcement material, and is bonded with silicone resin adhesive. The glass fiber cloth is woven with alkali-free glass yarn, which is an inorganic silicon material with certain insulation properties and a melting temperature of more than 600°C. It is processed by weaving technology and is also used as a reinforcement. The insulator is formed by coating inorganic curing paint, silicon powder and borax, etc. Nickel-iron alloy thermistor metal wire and conductor with a melting point of more than 1300°C are used, and glass fiber yarn, glass fiber mica tape and high temperature resistant polyimide treated with silicone resin coating resistant to 500°C are used as the insulation. Thermal insulation layer. According to existing data, after carbon fiber modified silicone resin is coated on glass fiber, its temperature resistance reaches 600℃ and above, the temperature resistance of high temperature resistant polyimide is 350℃ and above, the temperature resistance of glass fiber composite mica tape is 600℃ and above, and the overall high temperature resistance of the heating belt is much higher than 300℃, which has a good anti-burning effect. The overall temperature resistance of the heating belt can be further improved by removing the high temperature resistant polyimide, increasing the number of winding layers of the glass fiber composite mica tape, and tightening the outer layer of the glass fiber composite mica tape with silicone resin coated glass fiber wire, so as to achieve the effect of withstanding high temperatures of 600℃ and above without burning at the cost of reducing some insulation performance.

[0011] At the same time, the thermistor metal wire is spirally wound along the length direction of the glass fiber wire, the glass fiber wire is spirally wound around the high-temperature resistant battery cell group, the thermistor metal wire is double-spirally wound, and the overall length will be much longer than the traditional single-spiral wound resistance wire. The overall heating area is larger and the heating efficiency is higher. The glass fiber wire has good insulation properties, which can effectively prevent the spirally wound thermistor metal wire from short-circuiting and affecting the heating efficiency. At the same time, it has good tensile resistance. When the self-limiting temperature PTC heating element is pulled, it is stressed at the first time to prevent external tension from destroying the spatial structure of the thermistor metal wire and causing a short circuit or affecting its heating efficiency. Combined with the glass fiber mesh and the glass fiber braided layer, it has a very strong shaping and convenient winding effect on the thermistor metal wire.

[0012] Furthermore, the positive temperature coefficient thermistor metal wire is made of nickel-iron alloy, the setting thickness of the nickel-iron alloy thermistor metal wire is set, and the setting area of ​​the nickel-iron alloy thermistor metal wire is calculated according to the resistance formula R=(ρ*L) / S, the setting area of ​​the nickel-iron alloy thermistor metal wire is set, and the setting thickness of the nickel-iron alloy thermistor metal wire is calculated according to the resistance formula R=(ρ*L) / S, where R is the resistance of the PTC material at 25±5°C, ρ is the resistivity of the PTC material at 25±5°C, L is the setting thickness of the PTC material, and S is the setting area of ​​the PTC material.

[0013] By adopting the above technical solution, when the heating power increases and the temperature rises, the resistance of the resistance wire can be increased to reduce the load power, thereby preventing the heating belt from further heating up and burning. When the temperature is low, the resistance can be effectively reduced, the load power can be increased, and the heat generation can be increased, so as to achieve the effect of adaptively and dynamically adjusting the overall power of the heating belt and maintaining a constant temperature. At the same time, the resistance formula R = (ρ*L) / S can be used to calculate and independently select the thermistor metal wire with appropriate parameters.

[0014] Furthermore, the soft shell protective layer is a stainless steel woven mesh, and the hard shell protective layer is a corrugated tube.

[0015] By adopting the above technical solution, stainless steel has good wrapping, wear resistance and flexibility, which effectively protects the middle structure and is also convenient for the bending and twisting of the heating belt. Combined with the corrugated tube with certain flexibility and puncture resistance, the combination of two layers of soft and hard protective layers not only facilitates the winding of the heating belt on the equipment to be heated, but also effectively protects against external climate influences and physical damage, effectively ensuring the service life of the heating belt.

[0016] Furthermore, the glass fiber braided layer, the glass fiber mesh and the glass fiber yarn are treated by silicone resin coating as follows:

[0017] A1. Put the following ingredients by weight: 65-70 parts of silicone resin solution, 11-13 parts of white carbon black, 7-9 parts of kaolin, 4-6 parts of aluminum powder, and 3-5 parts of carbon fiber into a stirring device;

[0018] A2, weigh 0.54%-0.6% of the A1 mixed solution of coupled KH550 and put it into the stirring device, start the stirring device and stir for 20-30 minutes to mix the components evenly;

[0019] A3, add curing agent polyamide 650, stir for 10-15 minutes to mix completely, and obtain coating liquid;

[0020] A4, coating the coating liquid obtained in step A3 on the front and back of the glass fiber, controlling the coating thickness to be 0.3-0.5 mm, and then baking at 65-70° C. for 20 min-30 min to achieve complete drying, thereby obtaining silicone-coated glass fiber filaments;

[0021] A5. Weaving the glass fiber filaments obtained in step A4 into a glass fiber mesh and a glass fiber braided layer.

[0022] By adopting the above technical scheme, the modified glass fiber coated with silicone resin has good flexibility and relatively high strength, and the insulation performance can be greatly enhanced. It is not easy to break during processing and is easy to be woven into a glass fiber mesh and a glass fiber braided layer. The glass fiber braided layer is combined with the glass fiber mesh. While effectively fixing the thermal sensitive metal wire, when the heating belt is twisted and bent, the two undergo adaptive deformation and can still bind and fix the thermal sensitive metal wire well.

[0023] Furthermore, the processing steps of a self-limiting temperature resistant heating belt are as follows:

[0024] B1. Manufacturing conductors;

[0025] B2, double-wrap the conductor with a high-temperature resistant polyimide film with a thickness of 2-3mm;

[0026] B3, wrap again with 2-3 layers of 0.5-0.8mm glass fiber composite mica tape to preliminarily produce a high temperature resistant core wire;

[0027] B4, take 2 high temperature resistant core wires prepared in step B3 and place them in parallel to form a high temperature resistant battery core group, wrap 2-3 layers of 2-3mm high temperature resistant polyimide film on the high temperature resistant battery core group, perform melt molding at 400-450℃, and then cool at room temperature for 2-3h to set the shape;

[0028] B5, then cover with a glass fiber braided layer formed by braiding glass fiber filaments coated with silicone resin;

[0029] B6. Use a punching machine to make holes and connect the two ends of the self-limiting temperature PTC heating element to the two conductors;

[0030] B7. Use a glass fiber mesh woven from glass fiber filaments coated with silicone resin to tightly bind the self-limiting temperature PTC heating element;

[0031] B8, wrap again with 2-3 layers of 0.5-0.8mm glass fiber composite mica;

[0032] B9, a stainless steel woven mesh is placed on the outer layer of the glass fiber composite mica in step B8, and a corrugated tube is placed on the outer layer of the stainless steel woven mesh again to obtain a finished linear heating tape;

[0033] B10. Connect the finished linear heating cable to the junction box with controller and electrically connect the two conductors.

[0034] In summary, the beneficial technical effects of the present invention are:

[0035] 1. Nickel-iron alloy thermistor wire and conductor with a melting point of more than 1300℃ are used, and glass fiber yarn, glass fiber mica tape and high-temperature resistant polyimide coated with silicone resin resistant to 500℃ are used as heat-resistant insulation layers. According to existing data, after the carbon fiber modified silicone resin is coated with glass fiber, its temperature resistance reaches 600℃ and above, the temperature resistance of high-temperature resistant polyimide is 350℃ and above, and the temperature resistance of glass fiber composite mica tape is 600℃ and above. The overall high-temperature resistance of the heating belt is much higher than 300℃, and it has a good anti-burning effect;

[0036] 2. Positive temperature coefficient thermistor metal wire is adopted. When the heating power increases and the temperature rises, the resistance of the resistance wire can be increased to reduce the load power, thereby preventing the heating belt from further heating up and burning. When the temperature is low, the resistance can be effectively reduced, the load power can be increased, and the heat generation can be increased, so as to achieve the effect of adaptively and dynamically adjusting the overall power of the heating belt and maintaining a constant temperature. At the same time, the thermistor metal wire with appropriate parameters can be selected independently according to the resistance formula R=(ρ*L) / S.

[0037] 3. Several groups of segmented thermal metal wires are used, and the length can be selected at will. When the thermal metal wire at the end is cut off, the cut thermal metal wire will not be powered on and heated, but the thermal metal wire in the middle that has not been cut off can heat normally because it is always connected to the conductor. When the thermal metal wire at the end is not cut off, all the thermal metal wires on the conductor can heat up normally, and have a good cut-and-use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0040] Figure 2 It is a schematic diagram of the cross-sectional structure of the high temperature battery cell group of the present invention;

[0041] Figure 3 It is a schematic diagram of the overall structure of the self-limiting temperature PTC heating element in the invention;

[0042] Figure 4 It is a schematic diagram of the microstructure of the self-limiting temperature PTC heating element in the present invention;

[0043] In the figure, 1. high temperature resistant battery cell group; 11. conductor; 12. heat resistant insulation layer; 2. glass fiber braided layer; 3. self-limiting temperature PTC heating element; 31. positive temperature coefficient thermistor metal wire; 32. glass fiber filament; 4. glass fiber mesh; 5. fire resistant insulation layer; 6. soft shell protective layer; 7. hard shell protective layer. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] refer to Figure 1-Figure 4 , including a high temperature resistant battery cell group 1 containing two conductors 11, the battery cell group is wrapped with a heat resistant insulation layer 12, the heat resistant insulation layer 12 is wrapped with a glass fiber braided layer 2, the glass fiber braided layer 2 is covered with a plurality of spirally wound groups of self-limiting temperature PTC heaters 3, the self-limiting temperature PTC heaters 3 are arranged in sections along the length direction of the high temperature resistant battery cell group 1, and both ends of the self-limiting temperature PTC heaters 3 are inserted into the high temperature resistant battery cell group 1 to electrically connect different conductors 11, the self-limiting temperature PTC heater 3 includes a thermistor metal wire with a positive temperature coefficient and a glass fiber filament 32, the thermistor metal wire is spirally wound along the length direction of the glass fiber filament 32, the glass fiber filament 32 is spirally wound around the high temperature resistant battery cell group 1, the glass fiber braided layer 2 is wrapped with a glass fiber mesh 4 with a fixed self-limiting temperature PTC heater 3, the glass fiber mesh 4 is wrapped with a fire-resistant insulation layer 5, the fire-resistant insulation layer 5 is wrapped with a soft shell protective layer 6, and the soft shell protective layer 6 is wrapped with a hard shell protective layer 7.

[0047] The conductors 11 are arranged in pairs and at intervals inside the high temperature resistant battery cell group 1 . The outer wall of the conductor 11 is wrapped with a heat resistant insulation layer 12 , and the heat resistant insulation layer 12 is wrapped with a fire resistant insulation layer 5 .

[0048] The heat-resistant insulating layer 12 is made of high-temperature resistant polyimide material prepared by a two-step process using phthalic anhydride, bisether dianhydride and p-phenylenediamine, the fire-resistant insulating layer 5 is a 2-3 layer wrapped glass fiber composite mica tape, and the conductor 11 is pure nickel or one of nickel alloys.

[0049] High temperature resistant polyimide is an excellent high temperature resistant insulating material and is very suitable for the insulating layer of the conductor. The glass fiber composite mica tape is made of synthetic mica paper as the base material, glass fiber cloth as the double-sided reinforcement material, and is bonded with silicone resin adhesive. The glass fiber cloth is woven with alkali-free glass fibers and is an inorganic silicon material with certain insulation properties. The melting temperature is above 600°C. It is processed by weaving technology and is also used as a reinforcement. The insulator is formed by coating inorganic curing paint, silicon powder and borax, etc. Nickel-iron alloy thermistor metal wires and conductors with a melting point of more than 1300°C are used 11, and glass fiber fibers 32, glass fiber mica tapes and high temperature resistant polyimide are used as heat-resistant insulating layers 12 that are treated with silicone resin coated at 500°C. According to the existing data, after the carbon fiber modified silicone resin is coated with the glass fiber, its temperature resistance reaches 600℃ and above, the temperature resistance of the high temperature resistant polyimide is 350℃ and above, the temperature resistance of the glass fiber composite mica tape is 600℃ and above, and the overall high temperature resistance of the heating belt is much higher than 300℃, which has a good anti-burning effect. The overall temperature resistance of the heating belt can be further improved by removing the high temperature resistant polyimide, increasing the number of winding layers of the glass fiber composite mica tape, and tightening the glass fiber filaments 32 coated with silicone resin on the outer layer of the glass fiber composite mica tape, so as to achieve the effect of withstanding high temperatures of 600℃ and above without burning at the cost of reducing some insulation performance.

[0050] At the same time, the thermistor metal wire is spirally wound along the length direction of the glass fiber yarn 32, and the glass fiber yarn 32 is spirally wound around the high-temperature resistant battery cell group 1. The thermistor metal wire is double-spirally wound, and the overall length will be much longer than the traditional single-spiral wound resistance wire. The overall heating area is larger and the heating efficiency is higher. The glass fiber yarn 32 has good insulation properties, which can effectively prevent the spirally wound thermistor metal wire from short-circuiting and affecting the heating efficiency. At the same time, it has good tensile resistance. When the self-limiting temperature PTC heating element 3 is pulled, it is stressed at the first time to prevent external tension from destroying the spatial structure of the thermistor metal wire and causing a short circuit or affecting its heating efficiency. Combined with the glass fiber mesh 4 and the glass fiber braided layer 2, it has a very strong shaping and convenient winding effect on the thermistor metal wire.

[0051] The positive temperature coefficient thermistor metal wire is made of nickel-iron alloy. The setting thickness of the nickel-iron alloy thermistor metal wire is set, and the setting area of ​​the nickel-iron alloy thermistor metal wire is calculated according to the resistance formula R=(ρ*L) / S. The setting area of ​​the nickel-iron alloy thermistor metal wire is set, and the setting thickness of the nickel-iron alloy thermistor metal wire is calculated according to the resistance formula R=(ρ*L) / S, where R is the resistance of the PTC material at 25±5°C, ρ is the resistivity of the PTC material at 25±5°C, L is the setting thickness of the PTC material, and S is the setting area of ​​the PTC material.

[0052] When the heating power rises and the temperature rises, the resistance of the resistance wire can be increased to reduce the load power, preventing the heating tape from further heating up and burning. When the temperature is low, the resistance can be effectively reduced, the load power can be increased and the heat generation can be increased, so as to achieve the effect of adaptively and dynamically adjusting the overall power of the heating tape and maintaining a constant temperature. At the same time, the resistance formula R = (ρ*L) / S can be used to calculate and independently select the thermistor metal wire with appropriate parameters.

[0053] The soft shell protective layer 6 is a stainless steel woven mesh, and the hard shell protective layer 7 is a corrugated tube.

[0054] Stainless steel has good wrapping, wear resistance and flexibility, which can effectively protect the intermediate structure while facilitating the bending and twisting of the heating tape. Combined with the corrugated tube with certain flexibility and puncture resistance, the combination of two layers of soft and hard protective layers not only facilitates the winding of the heating tape around the equipment to be heated, but also effectively protects against external climate influences and physical damage, effectively ensuring the service life of the heating tape.

[0055] The glass fiber braided layer 2, the glass fiber mesh 4 and the glass fiber filaments 32 are treated by silicone resin coating as follows:

[0056] A1. Put the following ingredients by weight: 65-70 parts of silicone resin solution, 11-13 parts of white carbon black, 7-9 parts of kaolin, 4-6 parts of aluminum powder, and 3-5 parts of carbon fiber into a stirring device;

[0057] A2, weigh 0.54%-0.6% of the A1 mixed solution of coupled KH550 and put it into the stirring device, start the stirring device and stir for 20-30 minutes to mix the components evenly;

[0058] A3, add curing agent polyamide 650, stir for 10-15 minutes to mix completely, and obtain coating liquid;

[0059] A4, coating the coating liquid obtained in step A3 on the front and back of the glass fiber, controlling the coating thickness to be 0.3-0.5 mm, and then baking at 65-70° C. for 20 min-30 min to achieve complete drying, thereby obtaining silicone-coated glass fiber filaments 32;

[0060] A5. Weaving the glass fiber filaments 32 obtained in step A4 into a glass fiber mesh 4 and a glass fiber braided layer 2.

[0061] The modified glass fiber coated with silicone resin has good flexibility and relatively high strength. The insulation performance can be greatly enhanced. It is not easy to break during processing and is easy to be woven into a glass fiber mesh 4 and a glass fiber braided layer 2. The glass fiber braided layer 2 is combined with the glass fiber mesh 4. While effectively fixing the thermal sensitive metal wire, when the heating belt is twisted and bent, the two undergo adaptive deformation and can still bind and fix the thermal sensitive metal wire well.

[0062] The processing steps of a self-limiting temperature resistant heating belt are as follows:

[0063] B1. Manufacturing conductor 11;

[0064] B2, using a high temperature resistant polyimide film with a thickness of 2-3 mm to wrap the conductor 11 in double layers;

[0065] B3, wrap again with 2-3 layers of 0.5-0.8mm glass fiber composite mica tape to preliminarily produce a high temperature resistant core wire;

[0066] B4, take 2 high temperature resistant core wires prepared in step B3 and place them in parallel to form a high temperature resistant battery cell group 1, wrap 2-3 layers of 2-3 mm high temperature resistant polyimide film on the high temperature resistant battery cell group 1, perform melt molding at 400-450°C, and then cool at room temperature for 2-3 hours to set the shape;

[0067] B5, then cover the glass fiber braided layer 2 woven from glass fiber filaments 32 coated with silicone resin;

[0068] B6. Use a punching machine to make holes and connect the two ends of the self-limiting temperature PTC heating element 3 to the two conductors 11;

[0069] B7, using a glass fiber mesh 4 woven from glass fiber filaments 32 coated with silicone resin to tightly bind the self-limiting temperature PTC heating element 3;

[0070] B8, wrap again with 2-3 layers of 0.5-0.8mm glass fiber composite mica;

[0071] B9, a stainless steel woven mesh is placed on the outer layer of the glass fiber composite mica in step B8, and a corrugated tube is placed on the outer layer of the stainless steel woven mesh again to obtain a finished linear heating tape;

[0072] B10. Connect the finished linear heating tape to the junction box with the controller and electrically connect the two conductors 11.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0074] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-limiting high temperature heating tape, comprising a high temperature resistant battery pack (1) containing two conductors (11), characterized in that: The battery cell group is wrapped with a heat-resistant insulating layer (12), the heat-resistant insulating layer (12) is wrapped with a glass fiber braided layer (2), the glass fiber braided layer (2) is provided with a plurality of spirally wound groups of self-limiting temperature PTC heating elements (3) on its outer shell, the self-limiting temperature PTC heating elements (3) are arranged in sections along the length direction of the high-temperature resistant battery cell group (1), the two ends of the self-limiting temperature PTC heating elements (3) are inserted into the high-temperature resistant battery cell group (1) to be electrically connected to different conductors (11), and the self-limiting temperature PTC heating elements (3) include a thermistor metal wire with a positive temperature coefficient. and glass fiber yarn (32), the thermosensitive metal wire is spirally wound along the length direction of the glass fiber yarn (32), the glass fiber yarn (32) is spirally wound around a high temperature resistant battery cell group (1), the glass fiber braided layer (2) is wrapped with a glass fiber mesh (4) having a fixed self-limiting temperature PTC heating element (3), the glass fiber mesh (4) is wrapped with a fire-resistant insulating layer (5), the fire-resistant insulating layer (5) is wrapped with a soft shell protective layer (6), and the soft shell protective layer (6) is wrapped with a hard shell protective layer (7).

2. A self-limiting temperature resistant heating belt according to claim 1, characterized in that: The conductors (11) are arranged in pairs and at intervals inside the high-temperature resistant battery cell group (1); the outer wall of the conductor (11) is wrapped with a heat-resistant insulation layer (12); the heat-resistant insulation layer (12) is wrapped with a fire-resistant insulation layer (5); and the conductor (11) is one of pure nickel or a nickel alloy.

3. A self-limiting temperature resistant heating belt according to claim 2, characterized in that: The heat-resistant insulating layer (12) is made of a high-temperature resistant polyimide material prepared by a two-step process using phthalic anhydride, bisether dianhydride and p-phenylenediamine, and the fire-resistant insulating layer (5) is a 2-3 layer wrapped glass fiber composite mica tape.

4. The self-limiting temperature resistant heating belt according to claim 1 is characterized in that: The positive temperature coefficient thermistor metal wire is made of nickel-iron alloy. The setting thickness of the nickel-iron alloy thermistor metal wire is set, and the setting area of ​​the nickel-iron alloy thermistor metal wire is calculated according to the resistance formula R=(ρ*L) / S. The setting area of ​​the nickel-iron alloy thermistor metal wire is set, and the setting thickness of the nickel-iron alloy thermistor metal wire is calculated according to the resistance formula R=(ρ*L) / S, where R is the resistance of the PTC material at 25±5°C, ρ is the resistivity of the PTC material at 25±5°C, L is the setting thickness of the PTC material, and S is the setting area of ​​the PTC material.

5. The self-limiting temperature resistant heating belt according to claim 1, characterized in that: The soft shell protective layer (6) is a stainless steel braided mesh, and the hard shell protective layer (7) is a corrugated tube.

6. A self-limiting temperature resistant heating belt according to claims 1-5, characterized in that: The glass fiber braided layer (2), the glass fiber mesh (4) and the glass fiber filaments (32) are treated by silicone resin coating as follows: A1. Put the following ingredients by weight: 65-70 parts of silicone resin solution, 11-13 parts of white carbon black, 7-9 parts of kaolin, 4-6 parts of aluminum powder, and 3-5 parts of carbon fiber into a stirring device; A2, weigh 0.54%-0.6% of the A1 mixed solution of coupled KH550 and put it into the stirring device, start the stirring device and stir for 20-30 minutes to mix the components evenly; A3, add curing agent polyamide 650, stir for 10-15 minutes to mix completely, and obtain coating liquid; A4, coating the coating liquid obtained in step A3 on the front and back of the glass fiber, controlling the coating thickness to be 0.3-0.5 mm, and then baking at 65-70° C. for 20 min-30 min to achieve complete drying, thereby obtaining silicone-coated glass fiber filaments (32); A5. Weaving the glass fiber filaments (32) obtained in step A4 into a glass fiber mesh (4) and a glass fiber braided layer (2).

7. A self-limiting temperature resistant heating belt according to claims 1-6, characterized in that: The processing steps are as follows: B1. manufacturing a conductor (11); B2, using a high temperature resistant polyimide film with a thickness of 2-3 mm to wrap the conductor (11) in double layers; B3, wrap again with 2-3 layers of 0.5-0.8mm glass fiber composite mica tape to preliminarily produce a high temperature resistant core wire; B4, taking two high temperature resistant core wires prepared in step B3 and placing them in parallel to form a high temperature resistant battery cell group (1), wrapping 2-3 layers of 2-3 mm high temperature resistant polyimide film on the high temperature resistant battery cell group (1), performing melt molding at 400-450° C., and then cooling at room temperature for 2-3 h to set the shape; B5, then covering the glass fiber braided layer (2) woven from glass fiber filaments (32) coated with silicone resin; B6. Use a punching machine to make holes and connect the two ends of the self-limiting temperature PTC heating element (3) to the two conductors (11); B7, using a glass fiber mesh (4) woven from glass fiber filaments (32) coated with silicone resin to tightly bind the self-temperature limiting PTC heating element (3); B8, wrap again with 2-3 layers of 0.5-0.8mm glass fiber composite mica; B9, a stainless steel woven mesh is placed on the outer layer of the glass fiber composite mica in step B8, and a corrugated tube is placed on the outer layer of the stainless steel woven mesh again to obtain a finished linear heating tape; B10. Connect the finished linear heating cable to a junction box with a controller, and the junction box electrically connects the two conductors (11).

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