Flexible electrocaloric film and flexible heating device

Abstract

The utility model provides a kind of flexible electrothermal film and flexible heating equipment, it is related to the technical field of electrothermal film, and the first hierarchical structure and the second hierarchical structure of flexible electrothermal film are provided with connecting layer;First hierarchical structure includes first protective layer, first conducting layer and first electrode layer, and first electrode layer is provided with two first electrodes of parallel arrangement;Second hierarchical structure includes second electrode layer, second conducting layer and second protective layer;Second electrode layer is provided with two second electrodes of parallel arrangement;Two first electrodes of first electrode layer are electrically connected with the second electrode of corresponding position in second electrode layer respectively, for making the heat of conducting layer between two first electrodes and two second electrodes generate.The flexible electrothermal film and flexible heating equipment provided in the utility model embodiment can realize low-voltage control, increase power density, and reduce energy consumption to some extent.

Description

Technical Field

[0001] This utility model relates to the technical field of electrothermal films, and in particular to a flexible electrothermal film and a flexible heating device. Background Technology

[0002] Flexible heating films, due to their flexible deformation properties, can be designed and processed into any shape, making them suitable for applications on various irregularly shaped surfaces. As a result, their research and application are becoming increasingly widespread.

[0003] However, the electrothermal films in related technologies require high power due to the need for electrothermal characteristics, which increases energy consumption and thus reduces the performance of the electrothermal films. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a flexible electrothermal film and a flexible heating device to alleviate the above-mentioned technical problems.

[0005] In a first aspect, this utility model provides a flexible electrothermal film, comprising: a first layer structure and a second layer structure arranged sequentially; a connecting layer disposed between the first layer structure and the second layer structure; the first layer structure comprising a first protective layer, a first conductive layer and a first electrode layer stacked sequentially, wherein the first electrode layer is provided with two first electrodes arranged in parallel; the first electrodes are electrically connected to the first conductive layer; the second layer structure comprising a second electrode layer, a second conductive layer and a second protective layer stacked sequentially; the second electrode layer is provided with two second electrodes arranged in parallel; the second electrodes are electrically connected to the second conductive layer; when the first layer structure and the second layer structure are connected through the connecting layer, the two first electrodes of the first electrode layer are respectively electrically connected to the second electrodes at corresponding positions in the second electrode layer; the first electrodes and the second electrodes are used to connect to an external circuit, and are used to generate heat in a first region on the first conductive layer located between the two parallel first electrodes and a second region on the second conductive layer located between the two parallel second electrodes under the control of the external circuit.

[0006] In conjunction with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein the first conductive layer and the second conductive layer are conductive layers made of transparent material.

[0007] In conjunction with the first aspect, or the first possible implementation of the first aspect, this utility model provides a second possible implementation of the first aspect, wherein the first conductive layer and the second conductive layer are graphene conductive layers, or the first conductive layer and the second conductive layer are conductive layers composed of ITO films.

[0008] In conjunction with the first aspect, this utility model provides a third possible implementation of the first aspect, wherein the connecting layer is an anisotropic conductive film layer; the anisotropic conductive film layer is conductive in a first direction and insulating in a second direction; wherein the first direction is a direction perpendicular to the plane where the connecting layer is located; and the second direction is a direction parallel to the plane where the connecting layer is located.

[0009] In conjunction with the first aspect, this utility model provides a fourth possible implementation of the first aspect, wherein the connecting layer is an adhesive layer; wherein the adhesive layer is composed of an adhesive material and is used to connect the first hierarchical structure and the second hierarchical structure; wherein the adhesive layer has perforations at positions corresponding to the first electrode and the second electrode, and the first electrode and the second electrode pass through the perforations to achieve electrical connection.

[0010] In conjunction with the first aspect, this utility model embodiment provides a fifth possible implementation of the first aspect, wherein the first protective layer and the second protective layer are protective layers made of transparent material.

[0011] In conjunction with the first aspect, or the fifth possible implementation of the first aspect, this utility model embodiment provides a sixth possible implementation of the first aspect, wherein the thickness of the first protective layer and the second protective layer is 50μm-150μm.

[0012] In conjunction with the first aspect, this utility model provides a seventh possible implementation of the first aspect, wherein the first electrode and the second electrode are screen-printed electrodes, and the width of the first electrode and the second electrode is 0.5mm-15mm.

[0013] In conjunction with the first aspect, or the seventh possible implementation of the first aspect, this utility model provides an eighth possible implementation of the first aspect, wherein the two first electrodes arranged in parallel are linearly parallel, or the two first electrodes arranged in parallel are curvedly parallel; the two second electrodes arranged in parallel are mirror-symmetrical to the two first electrodes arranged in parallel.

[0014] Secondly, this utility model embodiment also provides a flexible heating device, which is equipped with the flexible electrothermal film described in the second aspect.

[0015] The present invention provides the following beneficial effects: This utility model provides a flexible electrothermal film and a flexible heating device, comprising a first-level structure and a second-level structure arranged sequentially; a connecting layer is provided between the first-level structure and the second-level structure; the first-level structure includes a first protective layer, a first conductive layer, and a first electrode layer stacked sequentially, the first electrode layer having two parallel first electrodes; the first electrodes are electrically connected to the first conductive layer; the second-level structure includes a second electrode layer, a second conductive layer, and a second protective layer stacked sequentially; the second electrode layer has two parallel second electrodes; the second electrodes are electrically connected to the second conductive layer; when the first-level structure and the second-level structure are connected through the connecting layer, the two electrodes of the first electrode layer... The first electrode is electrically connected to the second electrode at the corresponding position in the second electrode layer. The first electrode and the second electrode are used to connect to an external circuit. Under the control of the external circuit, heat is generated in the first region between the two parallel first electrodes on the first conductive layer and the second region between the two parallel second electrodes on the second conductive layer. Since the two first electrodes of the first electrode layer are electrically connected to the second electrodes at the corresponding positions in the second electrode layer, the first region and the second region can be electrically connected in parallel. Therefore, the resistance of the overall energized part can be reduced, and the required heat demand can be met with low voltage control. This can increase the power density and reduce energy consumption to a certain extent.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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.

[0019] Figure 1 A schematic diagram of a flexible electrothermal film provided for an embodiment of this utility model; Figure 2 A bottom view of a first-level structure provided for an embodiment of this utility model; Figure 3A schematic diagram of another flexible electrothermal film provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of another flexible electrothermal film provided in an embodiment of the present invention.

[0020] Reference numerals: 100-Connecting layer; 101-First protective layer; 102-First conductive layer; 103-First electrode layer; 201-Second electrode layer; 202-Second conductive layer; 203-Second protective layer; 103a-First electrode; 201a-Second electrode. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments 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.

[0022] Typically, when an electrothermal film is in operation, electricity needs to be passed through the conductive layer via electrodes. The conductive layer has a certain resistance, and heat is generated when electricity is applied, thus achieving the heating function. Due to the heat requirements of electrothermal properties, the material of the conductive layer needs to have a certain resistance to achieve the electrothermal effect through resistance heating. However, when the resistance of the conductive layer is high, the required voltage is also relatively high, which increases the energy consumption of the electrothermal film to some extent.

[0023] Based on this, the flexible electrothermal film and flexible heating device provided in this utility model embodiment can reduce the voltage requirement of the overall conductive layer, thereby reducing the energy consumption of the electrothermal film.

[0024] To facilitate understanding of this embodiment, a flexible electrothermal film disclosed in this utility model embodiment will first be described in detail.

[0025] In one possible implementation, the present invention provides a flexible electrothermal film, which includes: a first layer structure and a second layer structure arranged sequentially; a connecting layer is provided between the first layer structure and the second layer structure.

[0026] Specifically, such as Figure 1 The diagram shows a flexible electrothermal film, wherein... Figure 1 The image shown is a front view of the flexible electrothermal film.

[0027] Specifically, such as Figure 1As shown, the first-level structure includes a first protective layer 101, a first conductive layer 102, and a first electrode layer 103 stacked sequentially, wherein the first electrode layer has two parallel first electrodes; the first electrodes are electrically connected to the first conductive layer; the second-level structure includes a second electrode layer 201, a second conductive layer 202, and a second protective layer 203 stacked sequentially, wherein the second electrode layer has two parallel second electrodes; the second electrodes are electrically connected to the second conductive layer, and... Figure 1 The diagram also shows a connection layer 100, namely... Figure 1 The shaded area in the image.

[0028] In practical use, the first-level structure and the second-level structure are actually mirror-symmetric structures. The two electrodes of the first-level structure are electrically connected to the two electrodes of the second-level structure, realizing the parallel connection of the conductive layers located in the first region and the second region, thereby reducing the resistance of the conductive layer in the energized part.

[0029] Furthermore, for ease of understanding, Figure 2 A bottom view of the first-level structure is also shown; due to the perspective, in Figure 2 Only the first conductive layer 102 and the two parallel first electrodes 103a included in the first electrode layer are shown. The two second electrodes of the second-level structure described above are arranged in a mirror image symmetrical to the two first electrodes of the first-level structure, and will not be described again here.

[0030] Furthermore, the first and second electrodes are arranged in parallel, and the distance between them is preset; wherein, Figure 2 The diagram shows two first electrodes arranged in a straight, parallel line, with the shaded area between the two parallel first electrodes forming the first region.

[0031] Furthermore, in this embodiment of the present invention, the first electrode and the second electrode are screen-printed electrodes, for example, 200-mesh screen-printed electrodes, which are respectively printed onto the first conductive layer and the second conductive layer by screen printing. The width of the first electrode and the second electrode is preferably 0.5mm-15mm.

[0032] In other embodiments, the two first electrodes can also be parallel curves. For example, the two first electrodes can be set as parallel curves of any shape. That is, in this embodiment of the present invention, the two parallel first electrodes are parallel by straight lines or parallel by curves. The two parallel second electrodes are mirror-symmetrical to the two parallel first electrodes. That is, both the first and second electrodes can be set as parallel by straight lines or parallel by curves. As long as the first and second electrodes are symmetrical, electrical connection can be achieved. The specific shapes of the first and second electrodes can be set according to the actual use. The symmetry of this embodiment of the present invention is not limited.

[0033] Furthermore, when the first-level structure and the second-level structure are connected via a connecting layer, the two first electrodes of the first electrode layer are electrically connected to the corresponding second electrodes in the second electrode layer. The first and second electrodes are used to connect to an external circuit, and under the control of the external circuit, to generate heat in the first region on the first conductive layer located between the two parallel first electrodes, and in the second region on the second conductive layer located between the two parallel second electrodes. That is, the conductive layers of the first and second regions are electrically interconnected, and when the electrodes are energized under the control of the external circuit, heat can be generated in the conductive layers of the first and second regions.

[0034] In specific implementation, based on Figure 1 In the vertical direction, the first-level structure and the second-level structure are arranged sequentially. The first electrode and the second electrode are disposed between the first conductive layer 102 and the second conductive layer 202. Except for the positions where the first electrode and the second electrode are located, the other areas between the first conductive layer 102 and the second conductive layer 202 are insulated and isolated by a connecting layer. This allows the conductive layers of the first region and the second region to be connected in parallel between the first electrode and the second electrode. The external circuit supplies power to the conductive layer located between the first region and the second region through the first electrode and the second electrode, thereby generating heat. Since the conductive layers of the first region and the second region are connected in parallel through the first electrode and the second electrode, the resistance can be reduced, and the flexible electrothermal film can be driven with a lower voltage. This not only increases the power density but also reduces energy consumption to a certain extent.

[0035] In practical use, the first and second conductive layers in this embodiment of the invention are preferably graphene conductive layers. Therefore, the flexible electrothermal film in this embodiment of the invention is actually a graphene flexible electrothermal film. Furthermore, based on the foldable and heat-resistant properties of the graphene conductive layer itself, it can achieve both flexibility and electric heating characteristics. Moreover, the flexibility achieved through foldability allows the flexible electrothermal film to be applicable to more scenarios.

[0036] Furthermore, the graphene conductive layer can be configured as a transparent layer; that is, the first conductive layer and the second conductive layer in the embodiments of this utility model are conductive layers made of transparent materials.

[0037] Furthermore, the first conductive layer and the second conductive layer can also be semiconductor conductive layers, such as conductive layers composed of ITO film (indium tin oxide transparent conductive film), etc. The specific configuration can be made according to the actual application, and this embodiment of the present invention does not limit this.

[0038] Furthermore, the aforementioned connecting layer is an anisotropic conductive film layer, also known as an ACF (Anisotropic Conductive Film) layer. Specifically, this anisotropic conductive film layer is conductive in a first direction and insulating in a second direction. In this embodiment of the invention, the first direction is perpendicular to the plane containing the connecting layer, and the second direction is parallel to the plane containing the connecting layer. Thus, when the first electrode and the second electrode are connected, the connection is made through the anisotropic conductive film layer, while the connection between two parallel first electrodes and two parallel second electrodes is equivalent to the second direction, i.e., it is in an insulating state.

[0039] For ease of understanding, Figure 3 A schematic diagram of another flexible electrothermal film is shown, in which, Figure 3 What is shown is with Figure 1 The corresponding side view of the flexible electrothermal film, and, Figure 3 In this example, the connecting layer is an anisotropic conductive film layer, and... Figure 3 The diagram also shows a first electrode 103a, a second electrode 201a, and a connecting layer 100. Figure 3 It can be seen that when the connecting layer is an anisotropic conductive film, the first electrode and the second electrode are connected through the connecting layer, that is, Figure 3 The black area of ​​the intermediate interconnect layer 100 is conductive. Furthermore, Figure 3 In the middle, the area between the first electrode layer 103 and the second electrode layer 201, except for the connecting layer and the first and second electrodes, can be filled with insulating material or left unfilled. The specific setting can be determined according to the actual use. The present invention is symmetrical and not limited.

[0040] In practical applications, to achieve the conductivity and insulation properties of the anisotropic conductive film layer, it typically contains oriented nickel-coated, gold-coated, or granular materials (1-10 μm in diameter), etc. Furthermore, the resistance in the first direction is <0.1 Ω·cm, achieving conductivity, while the resistance in the second direction is >10 Ω·cm. 8 The insulation performance is achieved by Ω·cm. The specific performance of the anisotropic conductive film layer can be set according to the actual use, and this embodiment of the utility model does not limit it.

[0041] Furthermore, in addition to the aforementioned anisotropic conductive film layer, the connecting layer in this embodiment can also be directly configured as an adhesive layer. This adhesive layer is composed of an adhesive material and is used to connect the first-level structure and the second-level structure. Since the adhesive material is generally an insulating material, perforations are provided on the adhesive layer at positions corresponding to the first and second electrodes. The first and second electrodes pass through these perforations to achieve electrical connection. That is, holes are cut into the adhesive layer at positions corresponding to the electrodes to allow the first and second electrodes to pass through and achieve electrical connection. Furthermore, insulation is achieved between the first and second conductive layers, except at the electrode locations.

[0042] For ease of understanding, Figure 4 A schematic diagram of another flexible electrothermal film is shown, and, Figure 4 What is shown in the middle is also related to Figure 1 The corresponding side view of the flexible electrothermal film, wherein, Figure 4 and Figure 3 The difference is Figure 4 The connecting layer 100 is an adhesive layer, through which the first electrode and the second electrode pass to achieve electrical connection.

[0043] Specifically, the adhesive material for the adhesive layer can be EVA (Ethylene Vinyl Acetate Copolymer), PET (Polyethylene terephthalate), or a mixture of EVA and PET, such as an adhesive layer composed of three layers: EVA-PET-EVA, to achieve the connection between the first and second level structures. The specific arrangement of the adhesive layer can be determined according to the actual application, and this embodiment of the invention does not impose any limitations on this.

[0044] Furthermore, in this embodiment of the present invention, the first protective layer and the second protective layer are made of transparent material, and the thickness of the first protective layer and the second protective layer in this embodiment of the present invention is 50μm-150μm.

[0045] In specific implementation, the first and second protective layers are preferably films made of PET material, but can also be one or more of the following materials: PI (Polyimide), PDMS (Polydimethylsiloxane), PVC (Polyvinyl chloride), TPU (thermoplastic polyurethane), PU (Polyurethane), and glass. The specific design can be determined according to the actual application, and this embodiment of the present invention does not impose any limitations on this.

[0046] Furthermore, in this embodiment of the invention, when preparing the flexible electrothermal film, a conductive film of a preset size can be pre-cut as the first conductive layer and the second conductive layer. Then, a first protective layer and a second protective layer of transparent material are cut based on the preset size. Furthermore, an electrode screen, such as 200-250 mesh, can be prepared, and the first and second electrodes can be screen-printed according to the electrode size. When an anisotropic conductive film layer is used as the connecting layer, the anisotropic conductive film layer can be printed over the entire area of ​​the first and second conductive layers. The prepared protective layer, the first conductive layer, the second conductive layer, and the anisotropic conductive film layer can be pressed together by simultaneously heating and pressing the upper and lower heating plates using an upper and lower heating plate presser to obtain the aforementioned flexible electrothermal film. The specific preparation method can be set according to the actual application, and this embodiment of the invention does not limit this.

[0047] Furthermore, this embodiment of the invention also provides a flexible heating device, which is equipped with the aforementioned flexible electric heating film.

[0048] The flexible heating device provided in this embodiment of the present invention has the same technical features as the flexible electrothermal film provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0049] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the flexible heating device described above can be referred to the corresponding process in the foregoing embodiments, and will not be repeated here.

[0050] Furthermore, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, 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, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A flexible electrocaloric film, characterized in that, The flexible electrothermal film includes: a first layer structure and a second layer structure arranged sequentially; a connecting layer is provided between the first layer structure and the second layer structure; The first hierarchical structure includes a first protective layer, a first conductive layer, and a first electrode layer stacked sequentially, wherein the first electrode layer is provided with two first electrodes arranged in parallel; the first electrodes are electrically connected to the first conductive layer. The second layer structure includes a second electrode layer, a second conductive layer, and a second protective layer stacked sequentially; the second electrode layer is provided with two parallel second electrodes; the second electrodes are electrically connected to the second conductive layer; When the first hierarchical structure and the second hierarchical structure are connected through the connecting layer, the two first electrodes of the first electrode layer are electrically connected to the corresponding second electrodes in the second electrode layer. The first electrode and the second electrode are used to connect to an external circuit, and are used to generate heat in a first region on the first conductive layer located between two parallel first electrodes and a second region on the second conductive layer located between two parallel second electrodes under the control of the external circuit.

2. The flexible electrocaloric film of claim 1, wherein, The first conductive layer and the second conductive layer are conductive layers made of transparent material.

3. The flexible electrocaloric film of claim 1 or 2, wherein, The first conductive layer and the second conductive layer are graphene conductive layers, or the first conductive layer and the second conductive layer are conductive layers composed of ITO film.

4. The flexible electrocaloric film of claim 1, wherein, The connecting layer is an anisotropic conductive film layer; the anisotropic conductive film layer is conductive in a first direction and insulating in a second direction; Wherein, the first direction is a direction perpendicular to the plane where the connecting layer is located; the second direction is a direction parallel to the plane where the connecting layer is located.

5. The flexible electrocaloric film of claim 1, wherein, The connecting layer is an adhesive layer; wherein, the adhesive layer is composed of adhesive material and is used to connect the first hierarchical structure and the second hierarchical structure; The adhesive layer has perforations at positions corresponding to the first and second electrodes, through which the first and second electrodes are electrically connected.

6. The flexible electrothermal film according to claim 1, characterized in that, The first protective layer and the second protective layer are made of transparent material.

7. The flexible electrocaloric film of claim 1 or 6, wherein, The thickness of the first protective layer and the second protective layer is 50μm-150μm.

8. The flexible electrocaloric film of claim 1, wherein, The first electrode and the second electrode are screen-printed electrodes, and the width of the first electrode and the second electrode is 0.5mm-15mm.

9. The flexible electrocaloric film of claim 1 or 8, wherein, The two first electrodes arranged in parallel are parallel in a straight line, or the two first electrodes arranged in parallel are parallel in a curve. The two second electrodes arranged in parallel are mirror images of the two first electrodes arranged in parallel.

10. A flexible heating apparatus, characterized by, The flexible heating device is equipped with the flexible electrothermal film as described in any one of claims 1 to 9.

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