CN115426733A - Conformal electric heating assembly, conformal electric heating product and preparation method - Google Patents

Abstract

The invention discloses a conformal electric heating component for thermal therapy, a conformal electric heating product and a preparation method. The product of the invention has simple structure and good stretching adaptability, and can meet the requirements of thermal therapy of different body parts and body types in use.

Description

Conformal electric heating component, conformal electric heating product and preparation method

technical field

The invention relates to thermotherapy electric heating equipment, in particular to a stretchable conformal electric heating assembly for thermotherapy, a conformal electric heating product and a preparation method.

Background technique

Thermotherapy is one of the most prevalent physical therapies for conditions such as arthritis and muscle wasting. At present, the most traditional thermal therapy is to manage the temperature of the human body in the form of heat packs or warm water bags, which have disadvantages such as poor mechanical flexibility, heavy weight, and difficult to accurately control the temperature. In order to solve the above problems, researchers have used curved metal conductive wires or new materials such as graphene, metal nanowires and carbon nanotubes to obtain portable and wearable transparent electric heaters. The transparent electric heater is to apply a voltage across the transparent conductive material to achieve the effect of heating. Although wearable electric heaters based on metal conductive wires can maintain stable current and power under the deformation and stretching of the skin, their heating temperature is not uniform; and electric heaters of new materials, such as graphene, metal nanowires, etc. And carbon nanotubes have a uniform heating temperature, but in the stretched state, there will be relative movement between the material and the material, and the resistance will increase with the increase of the tensile strength, resulting in unstable heating current and power. There is even a local high temperature state, and when applied to the human body, it is easy to burn the skin. Therefore, how to realize a stretchable transparent electric heating system that conforms to the skin, precisely controls temperature, and has good heating uniformity and stability is a problem to be solved.

The information disclosed in this Background section is only for enhancing the understanding of the general background of the present invention and should not be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a conformal electric heating component for hyperthermia, a conformal electric heating product and a preparation method, which have good conformal adaptability to human body shape.

The conformal electrothermal assembly for thermotherapy of the present invention includes a base structure and an electrothermal structure arranged on the base structure. The electrothermal structure includes a first lead pole area, a second lead pole area and a heating structure. The heating structure is electrically connected to the Between the first lead pole area and the second lead pole area, at least one of the heating structure, the first lead pole area, and the second lead pole area includes a stretchable component part, and the distance between the two ends of the component part in the stretched state greater than the distance between the two ends of the member before being stretched; the base structure is flexible and transparent. The limitation here means that the distance between the two ends of the member part after being stretched non-stretch to have a straight structure is greater than the distance between the two ends before stretching. The flexibility of the base structure here may be brought about by the flexibility of the material of the base structure itself. It can also be brought about by the structure form of the base structure itself, for example, the base body is obtained by a plurality of movably connected modular structures on its extended surface. Can represent the ability to stretch or bend. The light transmittance can be achieved through the light transmittance material itself, such as transparent plastic, or through the permeability of existing gaps. The first lead pole region and the second lead pole region can each be made of stretchable conductive paste or metal wire material; the respective forms of the first lead pole region and the second lead pole region can be formed with several repeating Or non-repeatable conductive unit structure. The stretchable conductive paste may include a paste dispersed with metal nanoparticles, carbon material, or conductive polymer material.

In one or more embodiments of the present invention, the base structure includes a first base and a second base that are stacked with each other, and the first lead pole area, the second lead pole area and the heating structure in the electrothermal structure are at least partially arranged The space formed between the first base and the second base; at least one of the first base and the second base has flexibility or extensibility, etc. in its extension direction and/or normal direction. Assuming that the first base and the second base extend along the direction of the paper, it can be referred to here as having a flexible and extensible recovery (retraction) ability along the direction of extension of the paper or perpendicular to the direction of the paper.

The heating structure and/or the first lead pole area and/or the second lead pole area are at least partially disposed in the space between the stacked first substrate and the second substrate, which may include a part of the heating structure or the first lead pole area. A part or a part of the second lead pole region also includes the case of the heating structure or the whole of one of the first lead pole region or the second lead pole region, and of course also includes the case that all three are included.

In one or more embodiments of the present invention, the component part comprises a conductor wire or conductor wire having a curved structure in at least one direction.

In one or more embodiments of the present invention, the component part is formed with several repeated unit structures in the heating structure and/or the first lead pole region and/or the second lead pole region.

In one or more embodiments of the present invention, there is an electrical connection between the heating structure and/or two adjacent unit structures in the first lead pole area and/or the second lead pole area.

In one or more embodiments of the present invention, the respective unit structures of the heating structure and/or the first lead pole region and/or the second lead pole region are repeatable or non-repeatable. That is to say, the heating structure may have a repeatable unit structure or a non-repeatable unit structure. The pole region of the first lead may have a repeatable unit structure or a non-repeatable unit structure. The second lead pole region may have a repeatable unit structure or a non-repeatable unit structure.

In one or more embodiments of the present invention, at least one of the first substrate and the second substrate is a surface structure formed of a transparent material or a translucent material. Preferably, at least part of the first base and the second base are stretchable.

In one or more embodiments of the present invention, at least one of the first substrate and the second substrate is made of PDMS film, ecoflex film, SEBS film, SBS film, PU film or TPU film. That is, the first substrate can be a single-layer film structure or a multi-layer film structure formed by one of PDMS film, ecoflex film, SEBS film, SBS film, PU film or TPU film, or a multi-layer film formed by several films. structure. The second substrate can be a single-layer film structure or a multi-layer film structure formed by one of PDMS film, ecoflex film, SEBS film, SBS film, PU film or TPU film, or a multi-layer film structure formed by several films.

The preparation method of the conformal electric heating assembly of the present invention comprises the following steps:

Preparing the heating structure: forming a conductive metal material on a preformed thin layer of conductive material to build a heating structure with a stretchable structure;

Forming: transfer the heating structure to the first substrate, and form the first lead pole area and the second lead pole area at both ends of the heating structure respectively, and set the second substrate on the other side of the heating structure. At this time, the heating structure is located The space between the first base and the second base. The transfer of the heating structure may include, but not limited to, winding, ultrasonic peeling, mechanical peeling, adhesive transfer using glue, vacuum adsorption, and the like.

In one or more embodiments of the present invention, the first lead pole region and/or the second lead pole region is a conductive metal material formed on a preformed thin layer of conductive material to construct a stretchable structure.

In one or more embodiments of the present invention, the first lead pole region and/or the second lead pole region having a stretchable structure are integrally formed with the heating structure.

The conformal electric heating product of the present invention includes a power supply assembly for supplying power to the functional structure and the aforementioned conformal electric heating assembly, and the power supply assembly is electrically connected to the first lead pole area and the second lead pole area of the conformal electric heating assembly.

Compared with the prior art, the solution of the present invention has the following advantages:

First of all, the conformal electric heating product of the present invention has the advantages of high light transmittance, low driving voltage, fast response speed, uniform heating, good thermal conductivity, and precise adjustment and control of temperature; at the same time, it has good stability and uniform heating OK, the heating temperature is within 5°C deviation;

Secondly, it has good stretching and deformation adaptability. Under the stretching and deformation conditions of human skin, it can maintain stable heating uniformity and power; at the same time, it has good adhesion to different surfaces (such as animal skin, glass, silica gel). Good conformality, waterproof and vapor permeable, can be applied to the temperature management of the human body;

Thirdly, the manufacturing process is simple, the structural stability is good under stretching and deformation conditions, and it is suitable for application requirements of different tensile strengths.

Description of drawings

Fig. 1 is a schematic plan view of an embodiment of a conformal electric heating assembly according to the present invention;

Fig. 2 is a schematic cross-sectional view of the embodiment of Fig. 1;

Fig. 3 is a schematic diagram of repeated structures of several unit structures according to an embodiment of the present invention, wherein a is a combination of 4 serpentine units, b is a combination of 4 wave-shaped units, c is a combination of 4 horseshoe-shaped units, and d is Curve shape, e is wavy net shape;

Fig. 4 is a schematic plan view of another embodiment of the conformal electric heating assembly according to the present invention;

Fig. 5 is a schematic cross-sectional view of the embodiment of Fig. 4;

Fig. 6 is a schematic plan view of another embodiment of the conformal electric heating assembly according to the present invention;

Fig. 7 is a schematic cross-sectional view of the embodiment in Fig. 6;

Fig. 8 is a flowchart of a manufacturing method of a conformal electric heating assembly according to an embodiment of the present invention;

Fig. 9 is a flow chart of another manufacturing method of the conformal electric heating assembly according to the embodiment of the present invention;

Fig. 10 is a flowchart of another manufacturing method of the conformal electric heating assembly according to the embodiment of the present invention;

Fig. 11 is a flow chart of another manufacturing method of the conformal electric heating assembly according to the embodiment of the present invention;

Fig. 12 is a schematic diagram of the implementation of the first substrate of the conformal electric heating component according to the embodiment of the present invention when it adopts a flexible structure.

Detailed ways

The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

The conformal electrothermal assembly for thermotherapy in the embodiment of the present invention includes a base structure and an electrothermal structure disposed on the base structure. The electrothermal structure includes a first lead pole area 11 and a second lead pole area 12 and a heating structure 20, The heating structure 20 is electrically connected between the first lead pole area 11 and the second lead pole area 12, and at least one of the heating structure 20, the first lead pole area 11, and the second lead pole area 12 includes a stretchable component part , the distance between the two ends of the member part in the stretched state is greater than the distance between the two ends of the member part before it is stretched. The limitation here means that the distance between the two ends of the component part after being stretched and unfolded without stress and deformation to have a straight structure is greater than the distance between the two ends before deployment, that is, intuitively speaking, the two ends of the stretched structure are non-stressed and deformed by bending. The distance between the ends is greater than the distance between the two ends before deployment (curved form). As shown in Figures 1, 3, 4, and 6, it has a curved shape.

In an embodiment of the present invention, the component part includes a conductor wire or a conductor wire having a curved structure in at least one direction. The conductor wire or conductor wire here may be a conductive metal wire or a conductive metal wire or a conductive non-metal wire or a conductive non-metal wire for conducting electricity, such as a copper wire or a graphene wire. That is, it can be used for the first lead pole region 11 and the second lead pole region 12 and other conductive connection structures; it can also be a heating wire used for heating the structure 20 to generate heat.

In the embodiment of the present invention, the component part has several repeated unit structures 21 formed in the heating structure 20 and/or the first lead pole region 11 and/or the second lead pole region 12 . Of course, it should be noted that all the unit structures 21 in the same structure may be repeatable; it may also be divided into several parts with repeatable unit structures 21, and the parts are not repeatable. As shown in Figures 1 and 6, the heating structure 20 shows that all of them are repeatable unit structures 21; The repeatable unit structure 21 situation, but wherein the repeatable unit structure 21 of the heating structure 20 is inconsistent with the repeatable unit structure 21 of the first lead pole region 11 and the second lead pole region 12; that is to say, the heating structure 20, the first lead pole region The region 11 and the second lead pole region 12 can independently have unit structures 21 or all of them can have unit structures 21, and these unit structures 21 can be repeatable or non-repeatable, even if In the same structure such as the heating structure 20 , the unit structure 21 may not be repeatable.

In the embodiment of the present invention, the heating structure 20 and/or the first lead pole area 11 and/or the second lead pole area 12 are electrically connected between two adjacent unit structures 21 .

The electrothermal assembly for thermotherapy according to the embodiment of the present invention includes the aforementioned stretchable electrothermal structure and the first base 31 and the second base 32, the first base 31 and the second base 32 together form a laminated structure, and the heating structure 20 And/or at least part of the first lead pole region 11 and/or the second lead pole region 12 is disposed in the space between the stacked first substrate 31 and the second substrate 32 . That is, the limited situation here includes a part of the heating structure 20 or a part of the first lead pole region 11 or a part of the second lead pole region 12, and also includes the heating structure 20 or the first lead pole region 11 or the second lead pole region 12 The overall situation of one, of course, also includes the situation where all three are included. That is to say, the first base 31 and the second base 32 can be respectively arranged on both sides of the electrothermal structure in a layered structure, and at this time, the first base 31 and the second base 32 are completely or partially Covering defines the area of the electrothermal structure on that side. As shown in Figures 1, 4, and 6, it shows that the electrothermal structure includes the first lead pole region 11 and the second lead pole region 12, and the heating structure 20 is covered and defined in the first base 31 and the second base 32. situation. At this time, it can be seen that the electrothermal structure is protected between the first substrate 31 and the second substrate 32 . Certainly at this time, the first base 31 and the second base 32 may be formed with a closed structure around the electrothermal structure.

In the embodiment of the present invention, at least one of the first base 31 and the second base 32 is a surface structure formed of a transparent material or a translucent material, that is, any one of the first base 31 or the second base 32 independently has a transparent The form and the other are not limited, and both the first base 31 and the second base 32 may have a transparent form.

In order to meet the realization of transparent form and stretchability, it can be adopted in the embodiment of the present invention that at least one of the first substrate 31 and the second substrate 32 is PDMS film or ecoflex film or SEBS film or SBS film or PU film or TPU membrane. Here, the first substrate 31 and the second substrate 32 can each be a layer structure of a single material, or a composite film structure of multiple layers of different materials. There is no limit to the selection of materials and composite forms, as long as they can meet the requirements of this application. The material of the first substrate 31 is the same as or different from the material of the second substrate 32 . In addition, the two substrates may independently have stretch recovery properties, that is, their materials may be flexible, or both may satisfy stretch recovery properties.

Certainly, in the embodiment of the present invention, the realization of the flexible function and stretchability of the first base 31 and the second base 32 may also be realized through a multi-piece modular structure that is movably connected. As shown in Figure 12, it is shown that the first base 31 is formed by a number of base modules arranged in an array, and two adjacent base modules are formed by connecting with flexible connectors such as ropes or rubber ropes. The morphology of the articulating member enables the flexible bending capability of the first substrate. At this time, the base module can be rigid or flexible as mentioned above.

In an embodiment of the stretchable electric heating thermotherapy product of the present invention, it includes a power supply component and a functional structure for supplying power to the functional structure, the functional structure is the aforementioned stretchable electric heating structure or the aforementioned electric heating component, the power supply The component is electrically connected to the first lead pole region 11 and the second lead pole region 12 in the functional structure. That is to say, the electric heating structure or electric heating component involved in the solution of the present invention is applied in the product, such as the electric heating pack and thermotherapy pack etc. that apply this functional structure or component. At this time, the power supply assembly can be a built-in power supply structure with a battery structure, and the battery supplies power to the first lead pole area 11 and the second lead pole area 12. Of course, the battery can be replaced or an external commercial power supply can be used. The form of charging can also be a structure in which an external plug is used to connect to the mains power supply to the first lead pole area 11 and the second lead pole area 12 .

In an embodiment of the present invention, a controller and a sensor for controlling power or temperature may also be provided on the power supply circuit connected to the first lead pole area 11 and the second lead pole area 12, and the temperature may be monitored by the sensor Or the current and voltage are fed back to the controller to control the working state of the heating structure 20, thereby improving the safety and comfort of the application.

In the solution of the present invention (as shown in Figures 1-2 and 4-7), it includes: a heating structure 20, a lead electrode area (including a first lead electrode area 11 and a second lead electrode area 12 correspondingly connected to the two poles of the heating structure 20 ), the first base 31 and the second base 32; the heating structure 20 and the lead electrode area are electrically connected to each other, and the heating structure 20 and the lead electrode area are sandwiched between the first base 31 and the second base 32.

The heating structure 20 is a stretchable metal wire network with a light transmittance of 40%-90%; 3 only gives an example shape and is not limited thereto); the metal wire width of the stretchable metal wire network is 3 μm-100 μm, the metal wire thickness is 3 μm-100 μm, and the network period is 20 μm-2 mm. These configurations all meet the buckling structure, so that the distance between the two ends of the buckled part in the natural unfolded state is greater than the distance between the two ends in the buckled state, that is, it can be unfolded without self-deformation. The heating structure 20 can also be a non-metallic conductive wire network, such as a graphene fiber network or a conductive ceramic network or a conductive polymer network. function.

Each unit shown in FIG. 3 is constructed of conductor filaments or conductor wires with a curved or buckled structure extending in two directions (the two directions are indicated by dotted lines in the figure) as a whole of the main body structure. At this time, in each repeatable unit, the conductor filaments or conductor lines in two directions are connected to each other, and this connection may be an electrical connection, and of course it may also be a structural connection. Of course, each unit can also be composed of more conductor filaments or conductor lines extending in different directions.

Of course, the heating structure 20 may also be formed as a buckled structure extending in one direction as shown in FIG. 3d.

The lead electrode area can also be a stretchable metal wire network (as shown in Figure 4 and Figure 5) or a stretchable conductive paste such as silver paste (as shown in Figure 6-9), the stretchable metal wire network The wire width of the metal wire is 3 μm-100 μm, the thickness of the metal wire is 3 μm-100 μm, and the network period is 20 μm-500 μm; the stretchable conductive paste is obtained by screen printing, spraying, transfer printing or scraping. The lead electrode area can also be a non-metallic conductive wire network, such as a graphene fiber network or a conductive ceramic network or a conductive polymer network, that is, the aforementioned metal wires can be replaced in whole or in part by conductive non-metallic wires to meet the requirements of electrical conductivity. function.

Generally speaking, the conductivity of the lead electrode region is 3-10 times that of the heating structure 20 .

The forming methods of the first base 31 and the second base 32 are casting, sticking, embossing, spraying, spin coating and the like.

In the implementation of this scheme, the production method of one embodiment is as shown in Figure 8:

S1. Provide a flexible substrate with a stretchable groove network structure;

S2. Forming a thin layer of conductive material at the bottom of the stretchable network structure of the flexible substrate, the thickness of the thin layer of conductive material being 1/10-1/2 of the depth of the groove network. .

S3, forming a conductive metal material on a thin layer of conductive material, thereby forming a stretchable metal wire network; the conductive metal material protrudes from the surface of the flexible substrate by 0.1-100 μm;

S4. For the transfer of the stretchable metal wire network to the film, the transfer method includes but not limited to winding, ultrasonic peeling, mechanical peeling, film adhesion transfer, vacuum adsorption transfer, etc. The selection of the transfer method here can be based on the performance of the material The choice is based on the differences in aspects such as convenience and operation, and the list is only an example, not a limitation to the scope of the transfer method.

The film can include one or more composite films of PU film, PE film, PVC film, PET film, PDMS film, ecoflex film, SEBS film, SBS film, TPU film, etc.

When the film in steps S5 and S4 is a non-stretchable film, attach the first substrate 31 to the surface of the transferred stretchable metal wire network; then uncover the film, and then form a stretchable film at both ends of the stretchable metal wire network. Stretch the conductive paste as the lead electrode area, and form the second substrate 32 on the other side of the stretchable metal wire network.

In the manufacturing method of one embodiment, as shown in FIG. 9, when the film in step S4 is a stretchable film, the film is used as the first substrate 31 at this time; Stretch the conductive paste as the lead electrode area, and form the second substrate 32 on the other side of the stretchable metal wire network.

In the manufacturing method of one embodiment, S5', the stretchable transparent electric heating system whose lead electrode area is a stretchable metal wire network, if the lead electrode area adopts a stretchable metal wire network, and the heating structure 20 The production of the stretchable metal wire network is completed synchronously, and the steps are like S1-S4; after the lead electrode area and the heating structure 20 are transferred to the film at the same time, as shown in Figure 10, if the film is a non-stretchable film, the transfer A first substrate 31 is formed on the surface of the stretchable metal wire network; then the film is peeled off, and a second substrate 32 is formed on the other side of the stretchable metal wire network.

In the manufacturing method of one embodiment, as shown in Figure 11, if the film is a stretchable film, then the film is used as the first substrate 31; then the second substrate is formed on the other side of the stretchable metal wire network 32.

The following example is used as an example only to illustrate this solution, not to limit it. First, a thin layer of silver nanoparticles is formed at the bottom of the stretchable groove network, and a copper metal material is formed on the thin layer of silver nanoparticles, which can be achieved by electroplating and other methods, so that the formed metal wire network has a line width of 8 μm and a thickness of 8 μm. Then, the stretchable metal wire network is transferred to the stretchable PU film (the first substrate 31) by ultrasonic and mechanical stripping, and a stretchable metal wire network is formed at both ends of the stretchable metal wire network by a scraping method. The silver paste is used as the lead electrode area, and the PU film (second substrate 32) is attached to finally form a stretchable transparent electric heating system conformal to the skin. Sampling test shows that the transparent electric heating system that conforms to the skin has a light transmittance of 83%. For a sample with a heating structure 20 area of 1cm*2cm, it can be heated to 50°C with a driving voltage of 0.4V and has good stability. The heating is uniform, and the temperature can be precisely controlled and adjusted. Under 60% stretching and deformation, the heating uniformity and heating power are almost unchanged; and it has excellent waterproof and vapor permeability properties and skin conformability.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to make and use various exemplary embodiments of the invention, as well as various Choose and change. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (10)

1. The conformal electric heating component is characterized in that it includes a base structure and an electric heating structure arranged on the base structure, The electrothermal structure includes a first lead pole region, a second lead pole region and a heating structure, the heating structure is electrically connected between the first lead pole region and the second lead pole region, the heating structure, the first lead pole region At least one of the region and the second lead pole region includes a stretchable component part, and the distance between the two ends of the component part in the stretched state is greater than the distance between the two ends of the component part before it is stretched; The base structure is flexible and transparent. 2. The conformal electric heating assembly according to claim 1, characterized in that, the base structure comprises a first base and a second base which are stacked on top of each other, the first lead pole area, the second The lead electrode region and the heating structure are at least partially disposed in the space formed between the first base and the second base; At least one of the first substrate and the second substrate is flexible in its direction of extension and/or normal. 3. The conformal electric heating assembly according to claim 1, characterized in that, the component part is formed with several repeated unit structures in the heating structure and/or the first lead pole region and/or the second lead pole region . 4. The conformal electric heating assembly according to claim 3, characterized in that, the respective unit structures of the heating structure and/or the first lead pole region and/or the second lead pole region are repeatable or non-repeatable of. 5. The conformal electric heating assembly according to claim 2, wherein at least one of the first substrate and the second substrate is a surface structure formed of a transparent material or a translucent material. 6. The conformal electric heating assembly according to claim 5, characterized in that at least one of the first substrate and the second substrate is made of PDMS film or ecoflex film or SEBS film or SBS film or PU film or TPU membrane. 7. A method for preparing a conformal electric heating component, comprising the following steps: Preparing the heating structure: forming a conductive metal material on a preformed thin layer of conductive material to build a heating structure with a stretchable structure; Forming: transfer the heating structure to the first substrate, and form the first lead pole area and the second lead pole area at both ends of the heating structure respectively, and set the second substrate on the other side of the heating structure. At this time, the heating structure is located The space between the first base and the second base. 8. The method for preparing a conformal electric heating assembly according to claim 7, characterized in that, the first lead pole region and/or the second lead pole region are conductive metal materials formed on a preformed thin layer of conductive material to build a stretchable structure. 9 . The method for manufacturing a conformal electric heating assembly according to claim 8 , wherein the first lead pole region and/or the second lead pole region with a stretchable structure are integrally formed with the heating structure. 10 . 10. A conformal electric heating product, characterized in that it includes a power supply assembly for supplying power to the functional structure and the conformal electric heating assembly according to any one of claims 1-6, the power supply assembly is electrically connected to the conformal electric heating The first lead pole area and the second lead pole area in the assembly.

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