CN220067715U - Heating film and heating pad - Google Patents
Heating film and heating pad Download PDFInfo
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- CN220067715U CN220067715U CN202320503788.2U CN202320503788U CN220067715U CN 220067715 U CN220067715 U CN 220067715U CN 202320503788 U CN202320503788 U CN 202320503788U CN 220067715 U CN220067715 U CN 220067715U
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Abstract
The utility model relates to a heating film and a heating pad, wherein the heating film comprises a heating layer and a packaging layer positioned on at least one side surface of the heating layer, and the heating layer comprises a carbonaceous heating sheet and a flexible circuit board with a U-shaped structure; the flexible circuit board with the U-shaped structure comprises a first arm part, a connecting part and a second arm part which are connected in sequence; at least one carbonaceous heating sheet is sequentially arranged along the U-shaped opening direction of the flexible circuit board, and two ends of the carbonaceous heating sheet are respectively connected with the first arm part and the second arm part of the flexible circuit board. According to the utility model, the flexible circuit board with the U-shaped structure is adopted as the electrode, the flexible circuit board can be arranged according to the size of the heating film, and the carbonaceous heating sheets are arranged at the U-shaped opening side by side, so that the heating uniformity is effectively ensured.
Description
Technical Field
The utility model relates to the technical field of heating pads, in particular to a heating film and a heating pad.
Background
The yoga mat is the most basic auxiliary equipment for yoga exercise, and has good rebound resilience, flatness and skid resistance; the floor is placed on the ground or the floor when yoga exercise is performed, and is used for isolating cold air on the floor. However, in winter, the temperature is low, the ground is cold, the whole yoga mat is cold and cool, people can feel very cold when directly touching the yoga mat, and the movement and the stretching of the people are not facilitated; the skin stiffness and cold invasion into the body after long-time contact can be caused, and the health is affected.
The inside of traditional technique at yoga mat sets up the membrane that generates heat, solves the chilly problem of ground contact through heating to the yoga mat, but has the uneven and with high costs scheduling problem that generates heat, in addition, these used heating membrane of yoga mat all can only drive with high-pressure commercial power, leads to the yoga mat can only use indoor, can not outdoor use, does not have portability. Therefore, how to provide a heating film with uniform heating is a technical problem that needs to be solved urgently at present.
Disclosure of Invention
Based on this, it is necessary to provide a heating film and a heating pad, which adopt a flexible circuit board having a U-shaped structure as electrodes, and can arrange the flexible circuit board according to the size of the heating film, and arrange carbonaceous heating sheets side by side at the U-shaped opening, thereby effectively improving heating uniformity.
The specific scheme for solving the technical problems is as follows:
in a first aspect, the utility model provides a heating film, which comprises a heating layer and a packaging layer positioned on at least one side surface of the heating layer, wherein the heating layer comprises a carbonaceous heating sheet and a flexible circuit board with a U-shaped structure;
the flexible circuit board in a U-shaped structure comprises a first arm part, a connecting part and a second arm part which are sequentially connected;
at least one carbonaceous heating sheet is arranged along the U-shaped opening direction of the flexible circuit board in sequence, and two ends of the carbonaceous heating sheet are respectively connected with the first arm part and the second arm part of the flexible circuit board.
In some embodiments, the width of the U-shaped opening portion in the flexible circuit board is 1.2-1.5 m.
In some embodiments, the U-shaped opening portion in the flexible circuit board has a depth of 0.3 to 0.5m.
In some embodiments, the distance between adjacent carbonaceous heat-generating sheets is 40 to 60mm.
In some embodiments, the positive and negative lead wires of the flexible circuit board are disposed at the same time on the first or second arm portions.
In some embodiments, the flexible circuit board is provided with an electrode exposing opening, the electrode exposing opening is located at the connection part of the flexible circuit board and the carbonaceous heating sheet, and the electrode exposing opening is used for exposing the electrode of the flexible circuit board.
Optionally, a conductive adhesive layer is disposed at the exposed opening of the electrode, and the conductive adhesive layer is located between the flexible circuit board and the carbonaceous heating sheet.
In some embodiments, an adhesive layer is disposed on a surface of the encapsulation layer, which contacts the heat generating layer.
In some embodiments, the packaging layer is provided with an exhaust hole, and the exhaust hole is positioned in a non-overlapping area of the packaging layer and the heating layer.
In a second aspect, the present utility model provides a heat generating pad, where the heat generating film according to the first aspect is used as the heat generating pad, and the heat generating pad further includes elastic layers disposed on two side surfaces of the heat generating film.
The utility model has the following beneficial effects:
the utility model adopts the flexible circuit board with the U-shaped structure as the electrode, the size of the flexible circuit board can be set according to the size of the heating film, and the carbonaceous heating sheets are arranged at the opening of the U-shaped structure of the flexible circuit board side by side, so that larger positive and negative electrode distance is realized, and the utility model can adapt to the heating film structures with different sizes; in addition, the utility model arranges a plurality of carbonaceous heating sheets at intervals to realize uniform heating.
Drawings
Fig. 1 is a schematic structural view of a heat generating film according to an embodiment of the present utility model.
Fig. 2 is a schematic structural view of yet another heat generating film according to an embodiment of the present utility model.
Wherein, 1-a first packaging layer; 2-a second encapsulation layer; 3-carbonaceous heat generating sheet; 4-a flexible circuit board; 5-electrode exposed opening; 6-exhaust hole.
Detailed Description
The following detailed description of the present utility model will provide further details in order to make the above-mentioned objects, features and advantages of the present utility model more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
In the traditional technology, the yoga mat adopts a copper-clad polyimide film after chemical etching as an electrode and a packaging layer, and a high-sheet-resistance graphene conductive film is used as a heating material, so that the width dimension of the heating film is limited; and the high sheet resistance graphene conductive film is used as a heating material, so that the distance between the anode and the cathode required for reaching the service temperature of the yoga mat is smaller, and the size of the heating film is further limited. Therefore, the heating film in the traditional technology is formed by splicing a plurality of graphene heating films, and the problems of uneven heating, high cost and the like exist. According to the utility model, the flexible circuit board is adopted as the electrode, and the flexible circuit board can be reasonably arranged according to the size of the heating film, so that the carbonaceous heating sheets arranged side by side in the opening direction of the flexible circuit board with the U-shaped structure are matched, and a plurality of graphene heating films are not required to be spliced, so that the effect of uniform heating is realized.
The first aspect of the utility model provides a heating film, as shown in fig. 1, the heating film comprises a heating layer and a packaging layer positioned on at least one side surface of the heating layer, and the heating layer comprises a carbonaceous heating sheet 3 and a flexible circuit board 4 with a U-shaped structure;
the flexible circuit board 4 with a U-shaped structure comprises a first arm part, a connecting part and a second arm part which are connected in sequence;
at least one carbonaceous heating sheet 3 is arranged in sequence along the U-shaped opening direction of the flexible circuit board 4, and two ends of the carbonaceous heating sheet 3 are respectively connected with the first arm part and the second arm part of the flexible circuit board 4.
The flexible circuit board 4 is adopted as an electrode in the heating film in the utility model, and can be suitable for heating films with different sizes. In addition, the flexible circuit board 4 is arranged into a U-shaped structure, the carbonaceous heating sheets 3 are arranged side by side in the opening direction of the U-shaped structure, the carbonaceous heating sheets 3 are arranged side by side at intervals, the carbonaceous heating sheets 3 are connected in parallel, the carbonaceous heating sheets 3 are utilized to heat simultaneously, the overall heating uniformity of a large-area heating film is ensured, and the problems of uneven temperature, unstable heating and the like caused by a spliced type structure of the plurality of heating films are effectively avoided.
As shown in fig. 1, the first arm and the second arm in the flexible circuit board 4 with the U-shaped structure respectively refer to two vertical sections with the U-shaped structure, and the connecting portion refers to a middle transverse section.
In some embodiments, the two side surfaces of the heating layer are provided with packaging layers, namely a first packaging layer 1 and a second packaging layer 2.
In some embodiments, the length of the flexible circuit board 4 is 1.3-1.6 m, for example, 1.30m, 1.35m, 1.40m, 1.45m, 1.50m, 1.55m or 1.60m, where the length of the flexible circuit board 4 refers to the height distance between the bottommost portion of the connection portion and the highest portion of the first arm portion or the second arm portion along the opening direction of the U-shaped structure, as shown in fig. 1 b.
In some embodiments, the flexible circuit board 4 has a width of 0.4 to 0.6m, for example, 0.40m, 0.42m, 0.44m, 0.46m, 0.48m, 0.50m, 0.52m, 0.54m, 0.56m, 0.58m, or 0.60m. Wherein the width of the flexible circuit board 4 refers to the distance between the faces of the first arm and the second arm facing the outside of the U-shaped opening, as shown in fig. 1 a 1 As shown.
Alternatively, the U-shaped opening portion in the flexible circuit board 4 has a length of 1.2m to 1.5m, for example, 1.20m, 1.24m, 1.28m, 1.32m, 1.36m, 1.40m,1.44m, 1.48m or 1.50m, as shown in figure a 2 Shown; further alternatively, the depth of the U-shaped opening portion is 0.3m to 0.5m, for example 0.30m, 0.32m, 0.34m, 0.36m, 0.38m, 0.40m, 0.42m, 0.44m, 0.46m, 0.48m or 0.50m.
In some embodiments, the distance between adjacent carbonaceous heat generation sheets 3 is 40-60 mm, for example 40mm, 42mm, 44mm, 46mm, 48mm, 50mm, 52mm, 54mm, 56mm, 58mm or 60mm, and the distance between adjacent carbonaceous heat generation sheets 3 is as w in fig. 1 2 As shown.
In some embodiments, the width of the carbonaceous heating sheet 3 is 30-50 mm, and the width of the carbonaceous heating sheet 3 is as w in FIG. 1 1 As shown.
In some embodiments, the sheet resistance of the carbonaceous heat-generating sheet 3 is 0.5 Ω/∈s, for example, 0.5 Ω/∈s, 1.0 Ω/∈s, 1.5 Ω/∈s, 2.0 Ω/∈s, 2.5 Ω/∈s, 3.0 Ω/∈s, 3.5 Ω/∈s, 4.0 Ω/∈s, 4.5 Ω/∈s, or 5.0 Ω/∈s.
In some embodiments, the carbonaceous heat-generating sheet 3 may be an artificial graphite layer, a natural graphite layer, a graphene/carbon nanotube composite layer, a graphene layer, or a carbon nanotube layer. The graphene/carbon nanotube composite layer is made of a graphene/carbon nanotube composite material, so that the carbon nanotubes and the graphene are complementary in structure and property, the respective advantages of the graphene and the carbon nanotube are fully exerted, namely, a continuous network structure of a carbon nanotube film is provided, gaps of the network structure are filled by a two-dimensional lamellar structure of the graphene to form a three-dimensional network structure, and the graphene/carbon nanotube composite layer has the characteristics of better performance than any single material, such as better isotropic thermal conductivity, isotropic electrical conductivity, a three-dimensional space micropore network and the like through a synergistic effect between the graphene and the graphene. Further, the carbonaceous heat-generating sheet 3 of the utility model may be a multi-layered structure, for example, the carbonaceous heat-generating sheet 3 may be at least two natural graphite layers; or, the carbonaceous heat generating sheet may be a laminate structure of at least two layers of an artificial graphite layer, a natural graphite layer, a graphene/carbon nanotube composite layer, a graphene layer and a carbon nanotube layer.
In some embodiments, the positive and negative lead wires of the flexible circuit board 4 are disposed at the same time on the first arm portion or the second arm portion.
In the utility model, the positive electrode outgoing line and the negative electrode outgoing line are arranged on one arm part of the flexible circuit board 4 with the U-shaped structure, so that the positive electrode outgoing line and the negative electrode outgoing line are conveniently led out, thereby being convenient for installation and use.
In some embodiments, the flexible circuit board 4 is provided with an electrode exposing opening 5 at the connection with the carbonaceous heating sheet 3, and the electrode exposing opening 5 is used for exposing the electrode of the flexible circuit board 4. The electrode exposing opening 5 exposes the electrode material in the flexible circuit board 4, i.e. the surface packaging layer is partially removed from the flexible circuit board 4.
In the utility model, the electrode exposed opening 5 is arranged at the joint of the flexible circuit board 4 and the carbonaceous heating sheet 3, and the U-shaped structure of the flexible circuit board 4 is combined in the assembling process of the carbonaceous heating sheet 3, so that the assembling and positioning and feeding and discharging processing of the carbonaceous heating sheet 3 are facilitated.
Optionally, a conductive adhesive layer is disposed at the exposed electrode opening 5, and the conductive adhesive layer is located between the flexible circuit board 4 and the carbonaceous heating sheet 3.
According to the utility model, the conductive adhesive layer is used for connecting the carbonaceous heating sheet 3 and the flexible circuit board 4, so that the contact effect is ensured, and the problem of poor contact caused by direct connection of the carbonaceous heating sheet 3 and the flexible circuit board 4 is avoided.
Further optionally, the conductive adhesive layer includes a conductive silver adhesive layer, a conductive carbon adhesive layer, or a conductive copper adhesive layer.
In some embodiments, an adhesive layer is disposed on a surface of the packaging layer, which contacts the heat generating layer. For example, the adhesive layer may be made of epoxy resin, which has viscosity when hot pressed, so as to perform the function of bonding and packaging.
In some embodiments, the encapsulation layer has a thickness of 75-150 μm, for example 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm. For example, the material of the encapsulation layer may be polyimide.
According to the utility model, the thickness of the packaging layer is controlled, so that the heating film can be rolled and stored in use while certain strength is ensured, and if the thickness of the packaging layer is relatively low, the heating film is softer and is easy to wrinkle in the packaging process; if the thickness of the packaging layer is relatively high, the use requirement of winding and storage is not met.
In some embodiments, as shown in fig. 2, the packaging layer is provided with a vent hole 6, and the vent hole 6 is located in a non-overlapping area of the packaging layer and the heating layer. Preferably, the exhaust hole 6 is opened between the adjacent carbonaceous heat-generating sheets 3.
According to the utility model, the exhaust holes 6 are formed in the non-carbonaceous heating sheet 3 area on the packaging layer, so that when the heating film is compounded into other film layers, the gas in the interlayer can be exhausted, and the problem of bulge after packaging and compounding is avoided.
Optionally, the cross section area of the exhaust hole 6 is 10-30 mm 2 For example 10mm 2 、12mm 2 、14mm 2 、16mm 2 、18mm 2 、20mm 2 、22mm 2 、24mm 2 、26mm 2 、28mm 2 Or 30mm 2 . Further alternatively, the number of the exhaust holes 6 is 16 to 32, for example, 16, 18, 20, 22, 24, 26, 28, 30 or 32.
It should be noted that the shape and arrangement of the exhaust holes 6 are not particularly limited and are not particularly limited in the present utility model, and those skilled in the art can reasonably select the shape and arrangement according to the actual use requirements. For example, the shape of the vent hole 6 may be circular, square, or triangular; the exhaust holes 6 may be arranged in an array or side by side. Preferably, at least one exhaust hole 6 is arranged between two adjacent carbonaceous heating sheets 3, so that when the heating film is packaged between other materials, the exhaust holes 6 are utilized to ensure that the exhaust can be carried out everywhere, and the gas bulge is effectively avoided.
In some embodiments, the heat generating film has a heat generating temperature of 40 to 70 ℃, for example 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃, 65 ℃, or 70 ℃.
In some embodiments, the heat generating film has an operating voltage of 24-36V, for example 24V, 25V, 26V, 27V, 28V, 29V, 30V, 31V, 32V, 33V, 34V, 35V, or 36V.
The working voltage of the heating film is 24-36V, and the outdoor portable use requirement can be met.
Illustratively, the present utility model provides a method for preparing a heat generating film according to the first aspect, the method comprising:
the method comprises the steps that carbonaceous heating sheets 3 are arranged on a flexible circuit board 4 in a U-shaped structure side by side along the direction of a U-shaped opening, and two ends of each carbonaceous heating sheet 3 are respectively connected with a first arm part and a second arm part of the flexible circuit board 4 to obtain a heating layer;
and arranging packaging layers on two sides of the heating layer, and packaging to obtain the heating film.
It should be noted that the packaging mode of the present utility model is not particularly limited and may be a heat-sealing packaging mode or an adhesive packaging mode.
In some embodiments, the flexible circuit board 4 is coated with conductive adhesive at the connection position between the flexible circuit board 4 and the carbonaceous heating sheet 3, and the carbonaceous heating sheet 3 is adhered to the conductive adhesive and then dried and cured. Optionally, a screen printing plate is used for coating conductive adhesive, namely, a mesh is arranged at a position corresponding to the exposed opening 5 of the electrode on the screen printing plate, so that positioning printing is realized.
Illustratively, the present utility model provides a method for preparing the above heat generating film, which comprises:
placing the flexible circuit board 4 with the U-shaped structure on a positioning tooling plate, then placing a screen printing plate above the positioning tooling plate, and printing conductive adhesive on the position of the flexible circuit board 4 with an electrode exposed opening 5 through a screen printer;
a carbonaceous heating sheet 3 is stuck on a flexible circuit board 4 with a U-shaped structure along the width direction parallel to a heating film, two ends of the carbonaceous heating sheet 3 are respectively and correspondingly arranged at the positions of a first arm part and a second arm part with conductive adhesive, and then the flexible circuit board is baked in an oven to solidify the conductive silver adhesive, wherein the width direction of the heating film is the direction from the first arm part to the second arm part, so as to obtain a heating layer;
and the heating layer is clamped between the two packaging layers in the middle, an adhesive layer is arranged on one side of the packaging layer facing the heating layer, and the heating layer is packaged between the two packaging layers by vacuum hot-pressing packaging, so that the heating film is obtained.
Optionally, holes are periodically punched in the areas of the non-flexible circuit board 4 and the non-carbonaceous heat-generating sheet 3 by means of laser cutting or knife die cutting.
A second aspect of the present utility model provides a heat generating pad using the heat generating film of the first aspect, the heat generating pad further comprising elastic layers disposed on both side surfaces of the heat generating film. For example, the material of the elastic layer may be rubber or thermoplastic elastomer (TPE).
It should be noted that the heating pad in the utility model may be a heating yoga pad.
In some embodiments, the elastic layer has a thickness of 2 to 5mm, such as 2.0mm, 2.3mm, 2.6mm, 2.9mm, 3.2mm, 3.5mm, 3.8mm, 4.1mm, 4.4mm, 4.7mm, or 5.0mm.
It should be noted that the combination mode of the elastic layer and the heating film can be heat sealing encapsulation or glue sealing encapsulation.
Example 1
The embodiment provides a heating film, including the layer that generates heat and be located the polyimide layer of layer both sides surface generates heat, the layer that generates heat includes 8 graphite layers and is flexible circuit board 4 of U-shaped structure, and the sheet resistance of graphite layer is 0.5 Ω/≡.
Wherein, the length of the heating film is 1.4m, the width is 0.6m, the working voltage is 24V, and the heating temperature is 70 ℃; the length of the U-shaped structure of the flexible circuit board 4 is 1.3m, the width is 0.6m, the first arm part and the second arm part of the flexible circuit board 4 are respectively provided with 8 electrode exposed openings 5, copper foils of the flexible circuit board 4 are exposed, the width of the opening of the U-shaped structure in the flexible circuit board 4 is 0.5m, and the depth is 1.2m; the two ends of the graphite layer are respectively connected to the exposed electrode openings 5 of the first arm part and the second arm part through conductive silver paste, the length direction of the graphite layer is parallel to the connecting part of the flexible circuit board 4, and the distance between the adjacent graphite layers is 40mm; the thickness of the polyimide layer is 75 mu m, and the side of the polyimide layer, which is contacted with the heating layer, is provided with an epoxy resin adhesive layer, and the thickness of the epoxy resin adhesive layer is 25 mu m.
The embodiment also provides a preparation method of the heating film, which comprises the following steps:
placing the flexible circuit board 4 with the U-shaped structure on a positioning tooling plate, then placing a screen printing plate above the positioning tooling plate, and printing conductive adhesive on the position of the flexible circuit board 4 with an electrode exposed opening 5 through a screen printer;
a carbonaceous heating sheet 3 is stuck on a flexible circuit board 4 with a U-shaped structure along the width direction parallel to a heating film, two ends of the carbonaceous heating sheet 3 are respectively and correspondingly arranged at the positions of a first arm part and a second arm part with conductive adhesive, and then the flexible circuit board is baked in an oven to solidify the conductive silver adhesive, wherein the width direction of the heating film is the direction from the first arm part to the second arm part, so as to obtain a heating layer;
and the heating layer is clamped between the two packaging layers in the middle, an adhesive layer is arranged on one side of the packaging layer facing the heating layer, and the heating layer is packaged between the two packaging layers by vacuum hot-pressing packaging, so that the heating film is obtained.
The embodiment also provides a heating pad, which comprises the heating film and TPE layers arranged on the surfaces of two sides of the heating film, wherein the thickness of the TPE layers is 3mm.
Example 2
The preparation of the structure of the heat generating film was provided as in example 1, except that the sheet resistance of the graphite layer was 5Ω/≡; the length of the heating film is 1.7m, the width is 0.4m, the working voltage is 36V, and the heating temperature is 40 ℃; the U-shaped structure of the flexible circuit board 4 has the length of 1.5m and the width of 0.3m; the polyimide layer had a thickness of 150. Mu.m.
Example 3
The heat generating film was prepared according to example 1, except that the polyimide layer was provided with vent holes 6 in a non-overlapping region with the graphite layer, the vent holes 6 were arranged in a 2X 8 array, the vent holes 6 were circular in shape, and the area was 30mm 2 The number is 16.
The method for setting the exhaust hole 6 adopts die cutting, and specifically comprises the following steps: the vent hole 6 is arranged on the heating film in a non-overlapping area with the flexible circuit board 4 and the graphite layer in a die cutting mode.
Comparative example 1
The graphene heating yoga mat in the publication No. CN212756965U is adopted, and consists of 8 graphene heating films with the thickness of 18cm multiplied by 12cm, wherein the working voltage is 24V, and the heating temperature is 70 ℃.
The temperature difference detection is carried out on the heating pad provided in the embodiment and the comparative example, and the detection method comprises the following steps:
placing 4 thermocouples at the position of the heating pad where the graphite layer is arranged and the position of the heating pad where the graphite layer is not arranged, uniformly arranging the thermocouples along the length direction of the graphite layer, electrifying the heating pad for 30min at room temperature of 25 ℃, and recording the temperature of each thermocouple, wherein the average value of the thermocouple temperature at the position of the graphite layer is recorded as T 1 The average temperature of the thermocouple at the position where the graphite layer is not arranged is recorded as T 2 The temperature uniformity of the heating film is defined by Δt=t 1 -T 2 Evaluation is performed, i.e. Δt=t 1 -T 2 The larger the number of (c) is, the worse the temperature uniformity is represented, and the test results are shown in table 1.
TABLE 1
| Numbering device | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| ΔT＝T 1 -T 2 | 10.5℃ | 7.7℃ | 9.6℃ | 21℃ |
As can be seen from the table above:
compared with the comparative example, the heating film provided by the embodiment of the utility model has good temperature uniformity, and the temperature difference between the position with the graphite layer and the position without the graphite layer is below 10.5 ℃, so that the application requirement of the yoga mat is effectively met. In addition, the utility model adopts a whole heating film structure instead of splicing a plurality of graphene heating films, thereby having lower cost.
Through the embodiment and the comparative example, the flexible circuit board 4 with the U-shaped structure is adopted as the electrode, the size of the flexible circuit board 4 can be set according to the size of the heating film, and the carbonaceous heating sheets 3 are arranged at the opening of the U-shaped structure in the flexible circuit board 4 side by side, so that larger positive-negative electrode distance is realized, and the heating film structure with different sizes can be adapted; in addition, a plurality of carbonaceous heating sheets 3 are arranged at intervals to realize uniform heating; in addition, the heating pad has low voltage and is convenient to carry. Furthermore, the heating sheet adopts a non-spliced structure, so that the use comfort of the heating pad is improved, the heating pad is convenient to store, the heating sheet is not easy to break and damage, and the service life is long.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. The scope of the utility model is therefore intended to be covered by the appended claims, and the description and drawings may be interpreted in accordance with the contents of the claims.
Claims (10)
1. The heating film is characterized by comprising a heating layer and a packaging layer positioned on at least one side surface of the heating layer, wherein the heating layer comprises a carbonaceous heating sheet and a flexible circuit board with a U-shaped structure;
the flexible circuit board in a U-shaped structure comprises a first arm part, a connecting part and a second arm part which are sequentially connected;
at least one carbonaceous heating sheet is arranged along the U-shaped opening direction of the flexible circuit board in sequence, and two ends of the carbonaceous heating sheet are respectively connected with the first arm part and the second arm part of the flexible circuit board.
2. The heat generating film according to claim 1, wherein a width of the U-shaped opening portion in the flexible circuit board is 1.2 to 1.5m.
3. The heat generating film according to claim 1, wherein a depth of the U-shaped opening portion in the flexible circuit board is 0.3 to 0.5m.
4. The heat-generating film according to claim 1, wherein a distance between adjacent carbonaceous heat-generating sheets is 40 to 60mm.
5. The heat generating film according to claim 1, wherein the positive electrode lead and the negative electrode lead of the flexible circuit board are provided at the same time to the first arm portion or the second arm portion.
6. The heat generating film as recited in claim 1, wherein the flexible circuit board is provided with an electrode exposing opening at a junction of the flexible circuit board and the carbonaceous heat generating sheet, the electrode exposing opening being for exposing an electrode of the flexible circuit board.
7. The heat generating film as recited in claim 6, wherein an electrically conductive adhesive layer is provided at the exposed opening of the electrode, the electrically conductive adhesive layer being located between the flexible circuit board and the carbonaceous heat generating sheet.
8. The heat generating film according to claim 1, wherein a side surface of the encapsulation layer in contact with the heat generating layer is provided with an adhesive layer.
9. The heat-generating film as claimed in any one of claims 1 to 8, wherein the encapsulation layer is provided with a vent hole, and the vent hole is located in a non-overlapping region of the encapsulation layer and the heat-generating layer.
10. A heating pad, wherein the heating pad adopts the heating film according to any one of claims 1 to 8, and the heating pad further comprises elastic layers arranged on two side surfaces of the heating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320503788.2U CN220067715U (en) | 2023-03-10 | 2023-03-10 | Heating film and heating pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320503788.2U CN220067715U (en) | 2023-03-10 | 2023-03-10 | Heating film and heating pad |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220067715U true CN220067715U (en) | 2023-11-21 |
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ID=88768492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320503788.2U Active CN220067715U (en) | 2023-03-10 | 2023-03-10 | Heating film and heating pad |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220067715U (en) |
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2023
- 2023-03-10 CN CN202320503788.2U patent/CN220067715U/en active Active
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