Multi-scene applicable heating plate

Abstract

The utility model relates to the technical field of heating plate provides a kind of heating plate suitable for multiple scenes, including support layer, composite heating layer and protective layer, and support is equipped with accommodating cavity and connecting hole, and connecting hole is communicated with accommodating cavity;Composite heating layer is covered in the surface of support layer, and the edge of composite heating layer extends lead connection part, lead connection part is embedded in accommodating cavity, and the power supply lead of lead connection part is led and is passed through connecting hole;Protective layer is covered in the surface of composite heating layer, lead connection part and support layer, and the gap between protective layer and support layer is filled with putty filling layer, and the surface of putty filling layer is flush with the surface of composite heating layer.The utility model gives consideration to high flatness, multiple scene compatibility and long-life heating plate, can be applied to new energy automobile interior, floor heating and wall thermal insulation etc. field, can effectively avoid the problem that welding point is exposed or protruding.Solve the problem that the lead welding part of traditional heating plate is easily formed protrusion due to solder accumulation, leading to uneven surface.

Description

Technical Field

[0001] This utility model relates to the field of heating plate technology, and in particular to a heating plate applicable to multiple scenarios. Background Technology

[0002] With the rapid development of smart homes, new energy vehicles, and building energy-saving technologies, electric heating film heating panels are widely used in floor heating, wall insulation, and interior heating of new energy vehicles due to their efficient and uniform heating characteristics. Among these applications, thinner design is a key trend in the development of heating panels. Thinner panels improve installation adaptability, allowing for embedded installation in floors or interior surfaces, reducing material costs, and avoiding space occupation issues caused by excessive thickness.

[0003] To achieve a thinner profile, existing electric heating film heating plates typically employ a double-layer planar structure consisting of an inner core of the heating film and a lead wire connection area. The inner core serves as the heating core layer, while the lead wire connection area is the interface region for connecting to external circuitry. Due to limitations in the welding process, the solder joints on the lead wire connection area can form localized protrusions, resulting in poor surface flatness of the heating plate and affecting the appearance quality of the final product. Simultaneously, these protruding solder joints can interfere with the mounting substrate, such as floor joists or interior panels, leading to installation difficulties or localized stress concentration. Over long-term use, the protruding areas are prone to solder joint detachment or breakage due to friction and pressure, shortening the lifespan of the heating plate. Utility Model Content

[0004] This utility model provides a heating plate applicable to multiple scenarios, which solves the above-mentioned technical defects in the prior art. It is a heating plate that takes into account high flatness, multi-scenario compatibility and long life. It can be applied to the interior of new energy vehicles, floor heating and wall insulation, etc., and can effectively avoid the problem of exposed or protruding weld points.

[0005] This utility model provides a heating plate applicable to multiple scenarios, comprising: A support layer having a receiving cavity and a connecting hole thereon, wherein the connecting hole communicates with the receiving cavity; A composite heating layer is applied to the surface of the support layer. A lead wire connection portion extends from the edge of the composite heating layer. One sidewall of the lead wire connection portion is perpendicular to one sidewall of the composite heating layer. The lead wire connection portion is embedded in the accommodating cavity. A power supply lead wire extending from the lead wire connection portion passes through the connection hole. A protective layer is applied to the surfaces of the composite heating layer, the lead wire connection portion, and the support layer. The gap between the protective layer and the support layer is filled with a putty filling layer, and the surface of the putty filling layer is flush with the surface of the composite heating layer.

[0006] According to the heating plate applicable to multiple scenarios provided by this utility model, the composite heating layer includes: The heating film core is covered on the surface of the support layer; The lead wire connection extends from the edge of the heating film core, one sidewall of the lead wire connection is perpendicular to one sidewall of the heating film core, and the width and length of the lead wire connection are both smaller than those of the heating film core.

[0007] According to the heating plate applicable to multiple scenarios provided by this utility model, the composite heating layer further includes a uniform temperature flame retardant layer; the uniform temperature flame retardant layer is applied to at least one of the inner core of the heating film and the lead wire connection portion.

[0008] According to the heating plate applicable to multiple scenarios provided by this utility model, the uniform temperature flame retardant layer includes one or more of graphene film, metal foil, and montmorillonite fiberglass.

[0009] According to the heating plate applicable to multiple scenarios provided by this utility model, at least one side of the heating film core is provided with an adhesive layer, and the heating film core is bonded to the support layer and the uniform temperature flame retardant layer through the adhesive layer; the adhesive layer is formed by one or more adhesives selected from epoxy, acrylic or polyurethane.

[0010] According to the heating plate applicable to multiple scenarios provided by this utility model, the upper and lower surfaces of the lead wire connection part are both coplanar with the corresponding surfaces of the heating film core, and the perpendicular connection parts between the lead wire connection part and the heating film core are smoothly connected by rounded chamfers.

[0011] According to the heating plate applicable to multiple scenarios provided by this utility model, the composite heating layer further includes a temperature detection element; The temperature sensing element is located at the lead connection portion and close to the composite heating layer. The temperature sensing element is used to detect the temperature of the composite heating layer and provide a temperature signal.

[0012] According to the heating plate applicable to multiple scenarios provided by this utility model, the temperature detection element includes a negative temperature coefficient thermistor; The negative temperature coefficient thermistor is fixed to the upper surface of the lead connection portion by an adhesive; or, the negative temperature coefficient thermistor is integrated into the electrode of the composite heating layer by reflow soldering and encapsulated by surface encapsulation material.

[0013] According to the present invention, a heating plate applicable to multiple scenarios is provided, which is used for heating floors, walls, or automotive interiors.

[0014] According to the present invention, when the heating plate is used for heating the floor or wall, the supporting layer includes any one of wood, cement, stainless steel and engineering plastics. When the heating plate is used to heat the interior of an automobile, the support layer comprises aluminum alloy or flame-retardant engineering plastic.

[0015] The heating plate provided by this utility model is applicable to multiple scenarios. The lead wire connection part is embedded in the cavity of the support layer. The gap between the protective layer and the support layer is filled with putty filling layer. After curing, a flat surface with the same plane as the composite heating layer is formed, which is a heating plate that takes into account high flatness, multi-scenario compatibility and long life. It can be applied to the interior of new energy vehicles, floor heating and wall insulation, etc. It can effectively avoid the problem of exposed or protruding solder joints, and solve the problem that the lead wire welding part of the traditional heating plate is prone to protrusion due to solder accumulation, resulting in an uneven surface.

[0016] In addition, the surface of the heating plate is flat and can be directly attached to substrates with high flatness requirements, such as floors and interior panels, without the need for additional sanding, which can significantly improve installation compatibility and installation efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of a heating plate applicable to multiple scenarios provided in this embodiment of the utility model.

[0019] Figure 2 This is a schematic diagram of the composite heating layer in a heating plate applicable to multiple scenarios provided by an embodiment of this utility model.

[0020] Figure 3 This is one of the schematic diagrams showing the layout of the uniform temperature flame-retardant layer in a heating plate applicable to multiple scenarios provided by this utility model embodiment.

[0021] Figure 4 This is the second schematic diagram of the layout of the uniform temperature flame-retardant layer in a heating plate applicable to multiple scenarios provided by this utility model embodiment.

[0022] Figure 5 This is the third schematic diagram of the layout of the uniform temperature flame-retardant layer in a heating plate applicable to multiple scenarios provided by this utility model embodiment.

[0023] Figure 6 This is a partial structural diagram of the lead wire connection part in a heating plate applicable to multiple scenarios provided by an embodiment of this utility model.

[0024] Figure 7This is an assembly diagram of the lead wire connection part in a heating plate applicable to multiple scenarios provided by this utility model embodiment.

[0025] Figure label: 10. Support layer; 11. Receiving cavity; 12. Connecting hole; 20. Composite heating layer; 21. Heating film core; 22. Temperature uniform flame retardant layer; 23. Lead wire connection part; 30. Protective layer; 40. Temperature detection element; 50. Solder joint; 60. Power supply lead wire. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0028] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] Figure 1 This is a cross-sectional view of a heating plate applicable to multiple scenarios provided in this embodiment of the utility model. Figure 2 This is a schematic diagram of the composite heating layer in a heating plate applicable to multiple scenarios provided by an embodiment of this utility model.

[0031] See Figure 1 and Figure 2 This utility model provides a heating plate applicable to multiple scenarios, which can be used for floor heating, wall heating, or automotive interior heating. The multi-scenario applicable heating plate includes a support layer 10, a composite heating layer 20, and a protective layer 30.

[0032] The support layer 10 is a flat structure made of wood, cement, metal (such as aluminum alloy, stainless steel), or engineering plastic. A cavity 11 is machined on the top surface of the support layer 10, and a connecting hole 12 is formed at the bottom of the support layer 10, communicating with the cavity 11. The shape of the cavity 11 matches the lead wire connection portion 23 described below, such as rectangular or circular, and the cavity 11 is used to embed the lead wire connection portion 23 of the composite heating layer 20. The connecting hole 12 is used to lead out the power supply lead 60 of the composite heating layer 20.

[0033] The material of the support layer 10 depends on the application scenario of the heating plate: when the heating plate is used for interior heating of new energy vehicles, the support layer 10 can be made of aluminum alloy or flame-retardant engineering plastics. When the heating plate is used for floor heating, the support layer 10 can be made of wood, cement, stainless steel or engineering plastics. When the heating plate is used for wall heating, the support layer 10 can be made of thin steel plate or engineering plastics.

[0034] A composite heating layer 20 is applied to the surface of the support layer 10. A lead wire connection portion 23 extends from the edge of the composite heating layer 20. One side wall of the lead wire connection portion 23 is perpendicular to one side wall of the composite heating layer 20. The lead wire connection portion 23 is embedded in the accommodating cavity 11. A power supply lead 60 extending from the lead wire connection portion 23 passes through the connection hole 12. After the power supply lead 60 passes through the connection hole 12, it is fixed by a silicone sleeve to prevent the power supply lead 60 from rubbing against the support layer 10 and causing damage.

[0035] The protective layer 30 is a continuous film layer covering the surface of the composite heating layer 20, the lead wire connection part 23 and the support layer 10. The protective layer 30 uses materials that are suitable for the scene, such as silicone for new energy vehicle interiors, epoxy resin for floor heating, and PVC for wall heating.

[0036] The gap between the protective layer 30 and the supporting layer 10 is filled with a putty filler layer, which is made of elastic putty, such as polyurethane putty or acrylic putty. The elastic putty can buffer external stress (such as floor trampling or interior pressure) and prevent the protective layer 30 and the supporting layer 10 from cracking due to thermal expansion and contraction.

[0037] The protective layer 30 is applied to the surface of the composite heating layer 20 by spraying or scraping, and the edge of the protective layer 30 is flush with the support layer 10. The putty filling layer is filled with putty by scraping the gap between the protective layer 30 and the support layer 10. After curing, it forms a flat surface that is the same plane as the support layer 10, that is, the surface of the putty filling layer is flush with the surface of the composite heating layer 20.

[0038] It is understood that the heating plate provided by this utility model embodiment, which is applicable to multiple scenarios, has a lead wire connection part 23 embedded in the accommodating cavity 11 of the support layer 10. The gap between the protective layer 30 and the support layer 10 is filled with a putty filling layer. After curing, a flat surface with the same plane as the composite heating layer 20 is formed, which is a heating plate that takes into account high flatness, multi-scenario compatibility and long life. It can be applied to the fields of new energy vehicle interior, floor heating and wall insulation, etc. It can effectively avoid the problem of exposed or protruding solder joints 50, and solve the problem that the lead wire welding part of the traditional heating plate is prone to protrusion due to solder accumulation, resulting in an uneven surface.

[0039] In addition, the surface of the heating plate is flat and can be directly attached to substrates with high flatness requirements, such as floors and interior panels, without the need for additional sanding, which can significantly improve installation compatibility and installation efficiency.

[0040] Continue reading Figure 2In some embodiments of this utility model, the composite heating layer 20 includes a heating film core 21, which is disposed on the surface of the support layer 10. A lead wire connection portion 23 extends from the edge of the heating film core 21, and one sidewall of the lead wire connection portion 23 is perpendicular to one sidewall of the heating film core 21. The width and length of the lead wire connection portion 23 are both smaller than those of the heating film core 21.

[0041] The heating film core 21 is a sheet-like electrothermal film structure, which can be a graphene electrothermal film, a metal-based electrothermal film (such as a nickel-chromium alloy film), or a carbon fiber electrothermal film. The heating film core 21 is covered on the upper surface of the support layer 10. The area of ​​the heating film core 21 can be slightly smaller than that of the support layer 10, leaving an edge sealing area. The heating film core 21 is bonded to the surface of the support layer 10 with a thermally conductive adhesive, such as one or more adhesives selected from epoxy thermally conductive adhesive, acrylic, and polyurethane, ensuring a bubble-free bond.

[0042] The lead connection portion 23 is an extended conductive area of ​​the heating film core 21. The lead connection portion 23 is electrically connected to the heating film core 21 by conductive adhesive (such as silver paste) or welding (such as laser welding). The lead connection portion 23 is embedded in the receiving cavity 11 of the support layer 10, ensuring that the size of the receiving cavity 11 is greater than or equal to the size of the lead connection portion 23. The power supply lead 60 led out from it, such as FPC flexible circuit or enameled wire, passes through the connection hole 12 of the support layer 10 and extends to the outside of the support layer 10.

[0043] Figure 3 This is one of the schematic diagrams showing the layout of the uniform temperature flame-retardant layer 22 in a heating plate applicable to multiple scenarios provided by this utility model embodiment. Figure 4 This is the second schematic diagram of the layout of the uniform temperature flame-retardant layer 22 in the heating plate applicable to multiple scenarios provided by this utility model embodiment. Figure 5 This is the third schematic diagram of the layout of the uniform temperature flame-retardant layer 22 in the heating plate applicable to multiple scenarios provided by this utility model embodiment.

[0044] See Figures 3 to 5 In some embodiments of the present invention, the composite heating layer 20 further includes a uniform temperature flame retardant layer 22, which is applied to at least one of the heating film core 21 and the lead wire connection portion 23.

[0045] It is understandable that the conductive area where the electrodes of the heating film core connect to the lead wire connection 23 is the core node for current input. Due to the limited contact area between the electrodes and the heating film core, and the high current density, localized overheating is prone to occur in the electrode area. To address this, a uniform temperature flame-retardant layer 22 is applied to the heating film core 21 and / or the lead wire connection 23 to achieve the dual functions of uniform heat diffusion and fire risk prevention.

[0046] Furthermore, the uniform temperature flame retardant layer 22 includes one or more of graphene film, metal foil, and styrene glass fiber.

[0047] When the uniform temperature flame retardant layer 22 is a graphene film, the heating film core 21 is a graphene electrothermal film. The uniform temperature flame retardant layer 22 is a single-layer graphene film, which is bonded to the upper surface of the heating film core 21 with a thermally conductive adhesive (such as one or more adhesives selected from epoxy thermally conductive adhesive, acrylic, and polyurethane). The uniform temperature flame retardant layer 22 completely covers the heating area of ​​the heating film core 21, and its edges are flush with the heating film core 21 to avoid local heat accumulation.

[0048] The high thermal conductivity of the graphene film allows for rapid lateral diffusion of heat from the heating film core 21, reducing surface temperature deviation. For example, in interior heating of new energy vehicles, the temperature of the area where the fabric contacts the heating plate can be stabilized at a preset temperature, preventing localized high-temperature burning of the fabric.

[0049] When a metal foil (aluminum foil) is applied to the lead wire connection portion 23, which is a copper foil conductor, and the temperature-regulating flame-retardant layer 22 is made of aluminum foil, it is adhered to the upper and lower surfaces of the lead wire connection portion 23 with high-temperature resistant tape (such as polyimide tape) (ensuring a tight fit with the lead wire connection portion 23 without wrinkles). The metal foil (aluminum foil) wraps around the sides and top of the lead wire connection portion 23, exposing only the interface end that connects to the external circuit.

[0050] For example, industrial equipment heating plates need to be shielded against electromagnetic interference to prevent the lead wire connection part 23 from heating up due to current fluctuations; outdoor wall heating plates need to be moisture-proof and flame-retardant, and aluminum foil can prevent water vapor penetration.

[0051] When the montmorillonite fiberglass composite layer is applied to the heating film core 21 and the lead wire connection portion 23, the montmorillonite fiberglass is applied between the heating film core 21 and the support layer 10 and to the sides of the lead wire connection portion 23 through a coating process. The entire lower surface of the heating film core 21 is covered, and the sides of the lead wire connection portion 23 are completely wrapped.

[0052] The low thermal resistance of the MgO fiberglass can accelerate the transfer of heat from the heating film core 21 to the support layer 10, preventing the heating film core 21 from overheating due to poor heat dissipation on the back side. For example: high-temperature environment heating plates (such as drying rooms, auxiliary heating around boilers), and heavy-duty industrial heating plates (requiring high pressure resistance and mechanical impact resistance).

[0053] Furthermore, if the uniform temperature flame retardant layer 22 includes a graphene film, an adhesive layer is provided on the surface of the graphene film to prevent delamination caused by vibration. The adhesive layer is formed by coating one or more adhesives selected from epoxy, acrylic, or polyurethane.

[0054] In the uniform temperature flame retardant layer 22, although the graphene film has the advantages of high thermal conductivity and lightweight, its bonding force with the substrate is relatively weak, and it is prone to delamination under dynamic environments such as vibration and impact (e.g., road bumps when new energy vehicles are driving, mechanical vibrations when industrial equipment is running). This problem can be specifically solved by setting an adhesive layer on the surface of the graphene film.

[0055] The delamination of graphene films is essentially due to interfacial bonding failure. The intermolecular forces (van der Waals forces) between the graphene film and the substrate (such as metal substrates or polymer layers) are insufficient to resist external mechanical stresses, such as shear forces and peeling forces caused by vibration. During the curing process, the adhesive penetrates into the micropores of the graphene film and the rough structure of the substrate surface, forming a mechanical lock and increasing the tensile force required for delamination.

[0056] Furthermore, the polar groups (such as epoxy and urethane groups) of adhesives such as epoxy and polyurethane can form hydrogen bonds or covalent bonds with the oxygen-containing functional groups (such as hydroxyl and carboxyl groups) of graphene films or substrate materials (such as the hydroxylated surface of aluminum alloys), which significantly improves the interfacial bonding energy.

[0057] Vibration can cause not only delamination but also stress concentration within the graphene film (such as at edges or wrinkles). Long-term accumulation of stress can lead to cracks (affecting thermal conductivity uniformity) or even fracture, resulting in localized failure. The sealant layer, acting as an elastic interlayer, can buffer stress in the following ways: the elastic deformation of the adhesive absorbs vibration energy, distributing concentrated stress evenly across the entire interface; the plastic deformation of the sealant inhibits the propagation of microcracks within the graphene film.

[0058] In some embodiments of this utility model, at least one side of the heating film core 21 is provided with an adhesive layer, and the heating film core 21 is bonded to the support layer 10 and the uniform temperature flame retardant layer 22 through the adhesive layer; the adhesive layer is formed by one or more adhesives selected from epoxy, acrylic or polyurethane.

[0059] Continue reading Figure 2 In some embodiments of this utility model, the upper and lower surfaces of the lead wire connection part 23 are coplanar with the corresponding surfaces of the heating film core 21, and the perpendicular connection parts between the lead wire connection part 23 and the heating film core 21 are smoothly connected by rounded chamfers.

[0060] In the composite heating layer 20, if the connection between the lead wire connection portion 23 (conductive area) and the inner core 21 of the heating film (heating area) is designed at a right angle, it is prone to problems such as breakage and desoldering due to stress concentration. By setting a chamfer, such as an arc corner or a bevel, the above problems can be improved.

[0061] The abrupt geometric change at right-angle joints leads to stress concentration. When the heating plate is subjected to external mechanical stresses, such as vibration, compression, or thermal expansion and contraction caused by temperature cycling, microcracks will preferentially appear at the right-angle edge and gradually propagate to fracture, as seen in the bumps on the road when a new energy vehicle is driving or the pressure from foot traffic on the floor heating plate. Chamfering, by transitioning the "sharp point" of the right angle into an arc or bevel, allows the stress to be evenly distributed in the transition area, significantly improving the fatigue strength of the joint.

[0062] In addition, the chamfer reduces the gaps at the joints, reduces the amount of residual air, improves the heat conduction efficiency, and avoids local high temperatures in the inner core 21 of the heating film due to "poor heat dissipation".

[0063] Therefore, by chamfering the connection between the lead wire connection 23 and the heating film core 21, the mechanical reliability and process adaptability of the heating plate can be improved through stress dispersion and assembly coordination mechanisms.

[0064] Figure 6 This is a partial structural diagram of the lead wire connection part 23 in a heating plate applicable to multiple scenarios provided by this utility model embodiment. Figure 7 This is an assembly diagram of the lead wire connection part 23 in a heating plate applicable to multiple scenarios provided by this utility model embodiment.

[0065] See Figure 6 and Figure 7 In some embodiments of this utility model, the composite heating layer 20 further includes a temperature detection element 40, which is disposed on the lead wire connection portion 23 and close to the inner core 21 of the heating film. The temperature detection element 40 is used to detect the temperature of the inner core 21 of the heating film and to feed back the temperature signal.

[0066] Since the heating film core 21 continuously generates heat during operation, when the heating plate surface is covered with heat insulation materials such as clothing or carpets, the heat cannot dissipate in time, resulting in a continuous increase in local temperature; if the covering material is flammable (such as some interior fabrics), it may cause overheating and combustion risks.

[0067] To address this, the present invention provides a temperature detection element 40 on the lead wire connection part 23 to monitor the actual temperature of the heating film core 21 in real time, and triggers a protection mechanism through feedback signals: when the temperature exceeds the safety threshold, an alarm signal is sent to the control system to alert the user or automatically cut off the power supply; if the temperature continues to rise to the dangerous threshold, the circuit breaker or MOSFET is directly linked to shut off the heating circuit to prevent the accident from escalating.

[0068] For example, in the scenario of interior heating in new energy vehicles, the interior fabrics are mostly flammable materials (such as PU leather). The temperature detection element 40 can respond quickly when the covering is accidentally covered or when there is a circuit failure, to prevent local high temperature from igniting the fabric and to ensure passenger safety.

[0069] Different application scenarios have significantly different temperature requirements (e.g., floors need to be scald-proof, walls need to be moisture-proof and heat-resistant, and the interior of new energy vehicles needs to be fireproof). The "near-field monitoring" characteristic of the temperature detection element 40 (close to the inner core 21 of the heating film) can specifically solve the scenario adaptation problem: For example, when applied to floor heating, the floor surface is often covered with insulation materials such as carpets or mats, which can obstruct heat transfer and lead to low surface temperature and overheating inside. The temperature detection element 40 is close to the inner core 21 of the heating film, which can sense the true internal temperature in real time and avoid misjudgment caused by the obstruction of insulation materials. If only the surface temperature is monitored, the internal temperature may be underestimated.

[0070] When applied to wall heating, the wall is exposed to the environment for a long time, with large fluctuations in temperature and humidity. The temperature detection element 40 can simultaneously monitor the temperature of the heating film core 21 and the ambient temperature, and adjust the heating power accordingly to prevent localized overheating caused by poor heat dissipation in high humidity environments.

[0071] When applied to interior heating in new energy vehicles, the confined space necessitates high temperature uniformity. The high-precision feedback from the temperature sensing element 40 ensures accurate matching of heating power across different areas, preventing localized overheating or undercooling.

[0072] This invention provides active safety protection and precise temperature control for heating plates, which not only solves the safety hazards caused by overheating of traditional heating plates, but also improves the user experience in multiple scenarios (such as floor anti-scalding, interior constant temperature, and wall moisture prevention) by dynamically adjusting energy efficiency. It is the core technical feature of multi-scenario heating plates upgrading from passive heating to intelligent temperature control.

[0073] Since the lead wire connection part 23 is coplanar with the heating film core 21 and is tightly attached, heat is quickly transferred to the lead wire connection part 23 through the thermally conductive adhesive or metal substrate. The temperature detection element 40 can quickly sense the real temperature of the heating film core 21 here, reducing thermal hysteresis.

[0074] The lead connection part 23 has a reserved connection interface for external circuits (such as FPC flexible circuits). The temperature detection element 40 can be directly integrated on the circuit board of the lead connection part 23 (such as SMD mounting) without additional openings or structural modifications, thus reducing assembly complexity.

[0075] See Figure 6 and Figure 7 In some embodiments of this utility model, the temperature sensing element 40 includes a negative temperature coefficient thermistor; the negative temperature coefficient thermistor is fixed to the upper surface of the lead connection portion 23 by an adhesive, or the negative temperature coefficient thermistor is integrated into the electrode of the heating film core 21 by reflow soldering and encapsulated by one or more of the surface encapsulation materials such as Pi, PET, PVC, nylon, and silicone.

[0076] Among them, the NTC (negative temperature coefficient thermistor) integrated structure is the core functional module in the heating plate for real-time temperature monitoring. Its essence is to mechanically and electrically connect the NTC sensor with the main structure of the heating plate (such as the inner core of the heating film), so that it can sense the temperature of the heating plate and feed back the signal, thereby realizing temperature control or protection (such as overheating power-off).

[0077] In some embodiments, the NTC can be directly attached to the upper surface of the lead connection portion 23 of the heating film core (i.e., the lead soldering area visible outside the heating plate) using an adhesive. Since the lead connection portion 23 itself is the interface area connecting the heating plate to the external circuit, the NTC can directly contact or be close to the heating area of ​​the heating plate (heating film core) at this location, thereby quickly sensing temperature changes.

[0078] In some embodiments, the NTC component can be directly soldered to the electrodes of the heating film core (i.e., the electrode pads of the internal circuitry of the heating plate) using a reflow soldering process. Since the electrodes are the connection points of the internal circuitry of the heating plate, the NTC component can be directly connected to the circuit after soldering, allowing for real-time monitoring of the temperature near the electrodes. The electrodes are typically in close contact with the heating film core, resulting in more accurate temperature sensing.

[0079] After welding, the NTC and welding area are encapsulated using materials such as Pi (polyimide) and PET (polyethylene terephthalate) through injection molding or coating processes to form a waterproof and dustproof protective layer. Finally, the overall encapsulation enables the heating plate to achieve an IP67 waterproof rating, allowing it to be immersed in water for a short time without water ingress.

[0080] Regardless of the integration method used, the core function of the NTC integrated structure is to monitor the temperature of the heating plate in real time and achieve the following through subsequent circuits (such as a temperature control module): when the temperature exceeds the threshold, cut off the power supply to prevent the heating film from overheating and causing damage or fire; feed back the temperature signal to the controller to dynamically adjust the heating power to achieve constant temperature control; and indicate potential faults (such as short circuit of the heating film) through abnormal temperature signals (such as local overheating).

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heating plate suitable for multiple scenarios, characterized in that, include: A support layer having a receiving cavity and a connecting hole thereon, wherein the connecting hole communicates with the receiving cavity; A composite heating layer is applied to the surface of the support layer. A lead wire connection portion extends from the edge of the composite heating layer. One sidewall of the lead wire connection portion is perpendicular to one sidewall of the composite heating layer. The lead wire connection portion is embedded in the accommodating cavity. A power supply lead wire extending from the lead wire connection portion passes through the connection hole. A protective layer is applied to the surfaces of the composite heating layer, the lead wire connection portion, and the support layer. The gap between the protective layer and the support layer is filled with a putty filling layer, and the surface of the putty filling layer is flush with the surface of the composite heating layer.

2. The heating plate applicable to multiple scenarios according to claim 1, characterized in that, The composite heating layer includes: The heating film core is covered on the surface of the support layer; The lead wire connection extends from the edge of the heating film core, one sidewall of the lead wire connection is perpendicular to one sidewall of the heating film core, and the width and length of the lead wire connection are both smaller than those of the heating film core.

3. The heating plate applicable to multiple scenarios according to claim 2, characterized in that, The composite heating layer also includes a uniform temperature flame-retardant layer; The uniform temperature flame retardant layer is applied to at least one of the inner core of the heating film and the lead wire connection portion.

4. The heating plate applicable to multiple scenarios according to claim 3, characterized in that, The uniform temperature flame retardant layer includes one of graphene film, metal foil, and montmorillonite fiberglass.

5. The heating plate applicable to multiple scenarios according to claim 3, characterized in that, At least one side of the heating film core is provided with an adhesive layer, and the heating film core is bonded to the support layer and the uniform temperature flame retardant layer through the adhesive layer.

6. The heating plate applicable to multiple scenarios according to claim 2, characterized in that, The upper and lower surfaces of the lead wire connection are coplanar with the corresponding surfaces of the heating film core. The perpendicular connection between the lead wire connection and the heating film core is smoothly connected by rounded chamfers.

7. The heating plate applicable to multiple scenarios according to any one of claims 1 to 6, characterized in that, The composite heating layer also includes a temperature detection element; The temperature sensing element is located at the lead connection portion and close to the composite heating layer. The temperature sensing element is used to detect the temperature of the composite heating layer and provide a temperature signal.

8. The heating plate applicable to multiple scenarios according to claim 7, characterized in that, The temperature sensing element includes a negative temperature coefficient thermistor; The negative temperature coefficient thermistor is fixed to the upper surface of the lead connection portion by an adhesive; or, the negative temperature coefficient thermistor is integrated into the electrode of the composite heating layer by reflow soldering and encapsulated by surface encapsulation material.

9. The heating plate applicable to multiple scenarios according to any one of claims 1 to 6, characterized in that, The heating plate is used for heating floors, walls, or automotive interiors.

10. The heating plate applicable to multiple scenarios according to claim 9, characterized in that, When the heating plate is used for heating the floor or walls, the support layer includes any one of wood, cement, stainless steel, and engineering plastics; When the heating plate is used to heat the interior of an automobile, the support layer comprises aluminum alloy or flame-retardant engineering plastic.

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