Self-temperature-limiting heating film, heating module and heating equipment

Abstract

The embodiment of the utility model discloses a self-temperature-limiting heating film, a heating module and a heating device, the self-temperature-limiting heating film comprises a heating layer, a first insulating layer and a second insulating layer, the first insulating layer, the heating layer and the second insulating layer are stacked in sequence, the heating layer is a PTC (Positive Temperature Coefficient) heating layer, the heating layer comprises a plurality of heating film strips, and the heating film strips are connected in parallel. When the temperature of the heating material in the PTC heating layer reaches a certain value, the resistance value of the heating material suddenly changes to be infinite, so that the temperature cannot continuously rise and is maintained within a certain temperature range, and when the temperature drops to a certain value, the heating function is restored, and the PTC heating layer can have an automatic temperature limiting function, so that the heating film is prevented from being overheated and burnt.

Description

Technical Field

[0001] The utility model relates to the technical field of heating films, in particular to a self-limiting temperature heating film, a heating module and a heating device. Background Art

[0002] With the progress of society and the improvement of living standards, heating-related daily necessities such as heating insoles and heating caps have entered people's homes, and the heating device is one of the core components of heating-related daily necessities. The temperature of the heating wire area of ​​the heating device is raised, allowing the temperature to contact the indirect material to form a warm area to make the body feel warm.

[0003] Existing heating film devices often use metal foils such as iron-chromium-aluminum, nickel-chromium, etc., which are etched to form heating wires. Such heating wires are prone to local hot spots and burnout, and are prone to aging and unstable performance during long-term use. Therefore, NTC and electric control boards are usually used to control the temperature of the heating film. However, NTC temperature sensing is prone to failure during use, resulting in the inability to control the temperature, causing the heating film to overheat and burn out. Utility Model Content

[0004] The purpose of the utility model is to propose a self-limiting temperature heating film, a heating module and a heating device, aiming to solve the problem that the existing heating film uses NTC to control the temperature of the heating film, which is prone to malfunction during use, resulting in the temperature being out of control and causing the heating film to overheat and burn.

[0005] The embodiment of the utility model provides a self-limiting temperature heating film, the self-limiting temperature heating film comprises a heating layer, a first insulating layer and a second insulating layer, the first insulating layer, the heating layer and the second insulating layer are stacked in sequence;

[0006] Wherein, the heating layer is a PTC heating layer, and the heating layer includes a plurality of heating film strips, and each of the heating film strips is connected in parallel.

[0007] In one embodiment, the heating layer further includes conductive lines, the heating film strips are spaced apart along the first direction, and the heating film strips are connected in parallel via the conductive lines.

[0008] In one embodiment, the conductive line is provided with two, and they are respectively a first conductive line and a second conductive line, the first conductive line includes a first conductive part and a first connecting part, the first conductive part is provided with a plurality and is spaced apart in the second direction, the first connecting part connects the first conductive parts, the second conductive line includes a second conductive part and a second connecting part, the second conductive part is provided with a plurality and is spaced apart between two adjacent first conductive parts, the second connecting part connects the second conductive parts, and the first connecting part and the second connecting part are spaced apart along the first direction;

[0009] Each of the heating film strips is connected to each of the first conductive parts and / or each of the second conductive parts, and the first direction is arranged at an angle to the second direction.

[0010] In one embodiment, the heating film strip is a film strip formed by a high-resistance slurry.

[0011] In one embodiment, the first insulating layer, the heating layer and the second insulating layer are heating films formed by heating and gluing.

[0012] In one embodiment, the first insulating layer is a soft film or a hard film, and the second insulating layer is a soft film or a hard film.

[0013] In one embodiment, the soft film is a PI soft film or a PET soft film, and the hard film is a ceramic film, a glass film or a hard plastic film.

[0014] In a second aspect, the utility model further provides a heating module, the heating module comprising a first heat-balancing layer, a second heat-balancing layer and a self-limiting temperature heating film of any of the above embodiments;

[0015] The first heat-spreading layer, the self-limiting temperature heating film and the second heat-spreading layer are stacked in sequence.

[0016] In a third aspect, the utility model further provides a heating device, which comprises the self-limiting temperature heating film of any one of the above embodiments or the heating module of the above embodiments.

[0017] In one embodiment, the heating device is an insulation box, a heating insole or a heating cap.

[0018] The following beneficial effects are achieved by using the embodiments of the present invention:

[0019] The self-limiting temperature heating film and heating module of the utility model are adopted, and the heating layer is a PTC heating layer. When the temperature of the heating material in the PTC heating layer reaches a certain value, the resistance value of the heating material suddenly changes to infinity, so that the temperature cannot continue to rise and is maintained within a certain temperature. When the temperature drops to a certain value, it shows resistance again, thereby restoring the heating function. The use of the PTC heating layer can have an autonomous temperature limiting function, thereby avoiding overheating and burning of the heating film. In addition, each heating film strip is connected in parallel, and the heating material of the PTC heating layer adopts a parallel circuit design. The parallel shunt control technology has good anti-interference ability and shunt effect, and is resistant to large current and high voltage shocks.

[0020] A self-limiting temperature heating film or heating module is applied to the heating equipment. Since the heating layer of the self-limiting temperature heating film is a PTC heating layer, when the temperature of the heating material in the PTC heating layer reaches a certain value, the resistance value of the heating material suddenly becomes infinite, so that the temperature cannot continue to rise and is maintained within a certain temperature. When the temperature drops to a certain value, it becomes resistive again, thereby restoring the heating function. The use of the PTC heating layer can have an autonomous temperature limiting function, thereby preventing the heating film from overheating and burning. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] in:

[0023] Figure 1 Schematic diagram of a heating module in one embodiment.

[0024] Figure 2 for Figure 1 Schematic diagram of the layout of the heating layer in the heating module shown.

[0025] Reference numerals: 100, heating layer; 110, conductive line; 111, first conductive line; 1111, first conductive part; 1112, first connecting part; 112, second conductive line; 1121, second conductive part; 1122, second connecting part; 120, heating film strip; 200, first insulating layer; 300, second insulating layer; 400, first heat-dissipating layer; 500, second heat-dissipating layer. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] See also Figure 1 and Figure 2 The embodiment of the utility model discloses a heating module, which includes a self-limiting temperature heating film, the self-limiting temperature heating film includes a heating layer 100, a first insulating layer 200 and a second insulating layer 300, the first insulating layer 200, the heating layer 100 and the second insulating layer 300 are stacked in sequence to form a plate or a coil.

[0030] In this embodiment, the heating layer 100 is a PTC heating layer 100. When the temperature of the heating material in the PTC heating layer 100 reaches a certain value, the resistance value of the heating material suddenly changes to infinity, so that the temperature cannot continue to rise and is maintained within a certain temperature. When the temperature drops to a certain value, it shows resistance again, thereby restoring the heating function. The use of the PTC heating layer 100 can have an autonomous temperature limiting function, thereby preventing the heating film from overheating and burning.

[0031] It is understandable that since the self-limiting temperature heating film of this embodiment does not need to be equipped with a temperature control component, it can save costs. Furthermore, since the self-limiting temperature heating film has PTC characteristics, it can set a fixed film temperature to work according to the operating conditions, without the need for additional temperature control measures or accessories.

[0032] Furthermore, the heating layer 100 includes a plurality of heating film strips 120, each heating film strip 120 is connected in parallel, and the heating material of the PTC heating layer 100 adopts a parallel circuit design. The parallel shunt control technology has excellent anti-interference ability and shunt effect, and is resistant to large current and high voltage shocks.

[0033] In one embodiment, the heating layer 100 further includes conductive lines 110 , and the heating film strips 120 are spaced apart along a first direction. The heating film strips 120 are connected in parallel through the conductive lines 110 , and when the conductive lines 110 are energized, each heating film strip 120 can generate heat.

[0034] Further, in this embodiment, there are two conductive lines 110, which are the first conductive line 111 and the second conductive line 112. The first conductive line 111 includes a first conductive part 1111 and a first connecting part 1112. There are multiple first conductive parts 1111, which are spaced apart in the second direction. The first connecting part 1112 connects each first conductive part 1111. The second conductive line 112 includes a second conductive part 1121 and a second connecting part 1122. There are multiple second conductive parts 1121, which are spaced apart between two adjacent first conductive parts 1111. The second connecting part 1122 connects each second conductive part 1121. The first connecting part 1112 and the second connecting part 1122 are spaced apart along the first direction. Each heating film strip 120 is connected to each first conductive part 1111 and / or each second conductive part 1121, and the first direction and the second direction are arranged at an angle. By such an arrangement, each heating film strip 120 is connected in parallel through the conductive line 110.

[0035] The heating layer 100 of this embodiment can maintain the temperature of the self-limiting temperature heating film within a certain value range by configuring the conductive lines 110 and the heating film strips 120, and the temperature can be self-limiting.

[0036] In one embodiment, the heating film strip 120 is a film strip formed by a high square resistance slurry. The heating film strip 120 utilizes the characteristics of the PTC heating material itself. Near the Curie temperature point, the resistance of the PTC heating material changes exponentially and quickly becomes infinite, so that temperature adaptation can be achieved to meet the constant surface temperature.

[0037] It is understandable that in this embodiment, PTC is the abbreviation of Positive Temperature Coefficient, which means positive temperature coefficient, and generally refers to semiconductor materials or components with a large positive temperature coefficient. Usually, the PTC we refer to is a positive temperature coefficient thermistor, referred to as a PTC thermistor. A PTC thermistor is a typical semiconductor resistor with temperature sensitivity. When a certain temperature (Curie temperature) is exceeded, its resistance value increases stepwise as the temperature rises.

[0038] In one embodiment, the first insulating layer 200, the heating layer 100 and the second insulating layer 300 are heating films formed by heating and gluing, and the preparation of a self-limiting temperature heating film can be completed quickly.

[0039] Furthermore, the first insulating layer 200 is a soft film or a hard film, and the second insulating layer 300 is a soft film or a hard film. The soft film can be rolled up, which is convenient for preparing a flexible self-limiting temperature heating film, and the hard film has high strength, which is convenient for ensuring the structural strength of the self-limiting temperature heating film.

[0040] Specifically, the soft film can be PI soft film or PET soft film. PI soft film is a polyimide film, which is formed by polycondensation of pyromellitic anhydride and diaminodiphenyl ether in a strong polar solvent and then cast into a film and then imidized. PET soft film is a high temperature resistant polyester film. The hard film can be a ceramic film, a glass film or a hard plastic film.

[0041] In one embodiment, the heating module further includes a first heat balancing layer 400 and a second heat balancing layer 500, and the first heat balancing layer 400, the self-limiting temperature heating film and the second heat balancing layer 500 are stacked in sequence. By setting the first heat balancing layer 400 and the second heat balancing layer 500, the temperature of the surface of the heating module can be made more uniform.

[0042] Furthermore, the first heat-spreading layer 400 and the second heat-spreading layer 500 are film layers formed by printing, coating or spraying a heat-spreading material on both sides of the self-limiting temperature heating film, so that the surface temperature of the heating module is more uniform, hot spots are avoided, and the service life of the self-limiting temperature heating film is extended. Specifically, the first heat-spreading layer 400 and the second heat-spreading layer 500 can be made of graphene heat-spreading material.

[0043] The preparation of the heating module of this embodiment includes the following steps:

[0044] S610 , cutting the substrate insulating material to prepare a first insulating layer 200 , wherein the first insulating layer 200 has a metal conductive material thereon.

[0045] S620 , etching a conductive circuit on the metal conductive material to form a conductive line 110 .

[0046] S630 , printing a self-limiting temperature resistor on the conductive line 110 to form a heating film strip 120 , and forming a first preparation module.

[0047] S640, drying the first preparation module, so that the conductive heating pattern of the heating film strip 120 is dried and formed at high temperature.

[0048] S650, providing a second insulating layer 300, and hot pressing it on the first preparation module to form a self-limiting temperature heating film.

[0049] S660 , printing, coating or spraying a heat-dissipating material on both sides of the self-limiting temperature heating film to form a first heat-dissipating layer 400 and a second heat-dissipating layer 500 to prepare a heating module.

[0050] S670, perform performance test on the heating module.

[0051] It should be noted that if the substrate insulating material does not have its own metal conductive material, it is necessary to firstly provide a conductive metal material on the first insulating layer 200 .

[0052] See also Figure 1 and Figure 2, a heating device of an embodiment includes the self-limiting temperature heating film of any of the above embodiments or the heating module of the above embodiments. It can be understood that when the self-limiting temperature heating film or the heating module is applied to the heating device, since the heating layer 100 of the self-limiting temperature heating film is a PTC heating layer 100, when the temperature of the heating material in the PTC heating layer 100 reaches a certain value, the resistance value of the heating material suddenly becomes infinite, so that the temperature cannot continue to rise and is maintained within a certain temperature. When the temperature drops to a certain value, it shows resistance again, thereby restoring the heating function. The use of the PTC heating layer 100 can have an autonomous temperature limiting function, thereby avoiding overheating and burning of the heating film.

[0053] In one embodiment, the heating device is a heat preservation box, a heating insole or a heating cap. When the heating device is a heat preservation box, it can be used to keep the battery warm. When the heating device is a heating insole or a heating cap. Since the self-limiting temperature heating film or heating module has an autonomous temperature limiting function, it can avoid overheating and burns caused by wearing the heating device.

[0054] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A self-limiting temperature heating film, characterized in that: The self-limiting temperature heating film comprises a heating layer, a first insulating layer and a second insulating layer, wherein the first insulating layer, the heating layer and the second insulating layer are stacked in sequence; Wherein, the heating layer is a PTC heating layer, and the heating layer includes a plurality of heating film strips, and each of the heating film strips is connected in parallel.

2. The self-limiting temperature heating film according to claim 1, characterized in that: The heating layer further comprises conductive lines, the heating film strips are spaced apart along a first direction, and the heating film strips are connected in parallel via the conductive lines.

3. The self-limiting temperature heating film according to claim 2, characterized in that: The conductive line is provided with two, and is respectively a first conductive line and a second conductive line, the first conductive line includes a first conductive part and a first connecting part, the first conductive part is provided in plurality and is spaced apart in the second direction, the first connecting part connects the first conductive parts, the second conductive line includes a second conductive part and a second connecting part, the second conductive part is provided in plurality and is spaced apart between two adjacent first conductive parts, the second connecting part connects the second conductive parts, and the first connecting part and the second connecting part are spaced apart along the first direction; Each of the heating film strips is connected to each of the first conductive parts and / or each of the second conductive parts, and the first direction is arranged at an angle to the second direction.

4. The self-limiting temperature heating film according to claim 1, characterized in that: The heating film strip is a film strip formed by high square resistance slurry.

5. The self-limiting temperature heating film according to claim 1, characterized in that: The first insulating layer, the heating layer and the second insulating layer are heating films formed by heating and gluing.

6. The self-limiting temperature heating film according to claim 1, characterized in that: The first insulating layer is a soft film or a hard film, and the second insulating layer is a soft film or a hard film.

7. The self-limiting temperature heating film according to claim 6, characterized in that: The soft film is a PI soft film or a PET soft film, and the hard film is a ceramic film, a glass film or a hard plastic film.

8. A heating module, characterized in that: The heating module comprises a first heat-spreading layer, a second heat-spreading layer and the self-limiting temperature heating film according to any one of claims 1 to 7; The first heat-dissipating layer, the self-limiting temperature heating film and the second heat-dissipating layer are stacked in sequence.

9. A heating device, characterized in that: The heating device comprises the self-limiting temperature heating film according to any one of claims 1 to 7 or the heating module according to claim 8.

10. The heating device according to claim 9, characterized in that The heating device is a heat preservation box, a heating insole or a heating cap.

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