Flexible heating body

Abstract

The utility model discloses a flexible heating element, which comprises a parallelogram-shaped graphene electrothermal film with long sides and short sides, two groups of opposite sides of the graphene electrothermal film are provided with electrodes, the electrodes of the two long sides extend along the length direction of the long sides and form high-power heating electrodes, and the electrodes of the two long sides extend along the length direction of the long sides. The electrodes of the two short edges extend in the length direction of the short edges and form a low-power heating electrode. The flexible heating body belongs to a resistor body, the high-power heating electrodes are arranged on the two long sides and the low-power heating electrodes are arranged on the two short sides by utilizing the relation that the distances between the two groups of opposite sides are different and the resistances are also different, so that the high-power heating electrodes or the low-power heating electrodes can be selectively supplied with power by combining a circuit in practical application; the heating temperature can be changed without changing the power-on voltage and the heating area, the heating effect is better, and the service life of the electrothermal film is not affected.

Description

Technical Field

[0001] The utility model relates to an electric heating element, in particular to a flexible heating element. Background Art

[0002] There are currently three main methods for regulating the temperature of heating elements. One is to adjust the power input voltage of the heating element (for example, a resistor is connected in series to the power supply line, and the voltage distributed to the heating element is changed by adjusting the resistance) to change the heating temperature. This method is prone to wear of the resistor after long-term operation, resulting in inaccurate regulation. Moreover, the constant change in voltage can easily shorten the life of the heating element. The second method is to regulate the temperature of the heating element by the duty cycle (controlling the interval frequency of power supply); this method generally requires relay control, and the relay is frequently operated and easily damaged and fails. In the above two cases, the entire heating element is generating heat during operation, while the third method is to have several groups of heating elements, and the temperature is adjusted by selecting different numbers of heating elements to work, but this method results in an uneven heating area.

[0003] Chinese patent publication CN 220673960U, published on March 26, 2024, discloses a flexible heating film and food warmer. The flexible heating film utilizes a conductive member, a first electrode, and a second electrode to generate heat when energized. This structure has only one set of electrodes, and the temperature of the flexible heating element is primarily regulated using the first and second methods described above. Utility Model Content

[0004] The purpose of the utility model is to provide a flexible heating element with a reasonable structure, which can change the heating temperature by changing the power supply of electrodes without changing the heating area.

[0005] The purpose of this utility model is achieved in this way:

[0006] A flexible heating element includes a graphene electric heating film in the shape of a parallelogram and having long sides and short sides. Electrodes are provided on two sets of opposite sides of the graphene electric heating film, wherein the electrodes on the two long sides extend along the length direction of the long sides and constitute high-power heating electrodes, and the electrodes on the two short sides extend along the length direction of the short sides and constitute low-power heating electrodes.

[0007] The purpose of the utility model can also be solved by the following technical measures:

[0008] As a more specific solution, the high-power heating electrode and the low-power heating electrode are separated from each other.

[0009] As a further solution, the graphene electric heating film is rectangular.

[0010] As a further scheme, the electrode comprises a silver adhesion layer, a conductive connection layer and a copper foil layer, the silver adhesion layer is in conductive connection with the surface of the graphene electrothermal film, and the copper foil layer is connected on the surface of the silver adhesion layer through the conductive connection layer.

[0011] As a further scheme, the silver adhesion layer is a silver paste adhesion layer, a silver electroplating adhesion layer or a silver evaporation adhesion layer; the conductive connection layer is a conductive glue adhesion layer or a low-temperature solder welding layer; and the thickness of the graphene electrothermal film is 10-70 mu m. The silver adhesion layer in the electrode is made of silver material with good oxidation resistance and conductivity, and is arranged on the graphene electrothermal film in the form of adhesion, so that the silver adhesion layer is prevented from being oxidized after being in contact with the graphene electrothermal film, and the copper foil layer is arranged on the silver adhesion layer, which is better in adhesion and reduces the probability of oxidation.

[0012] As a further scheme, the electrode is provided with a lead-out end, one end of the lead-out end is in conductive connection with the electrode, and the other positions of the lead-out end extend out of the electrode.

[0013] As a further scheme, the outer end portions of the two lead-out ends corresponding to the high-power heating electrode are close to each other, the outer end portions of the two lead-out ends corresponding to the low-power heating electrode are close to each other, or the outer end portions of the lead-out ends corresponding to the high-power heating electrode and the low-power heating electrode are close to each other. The lead-out end is connected with the electrode by using a copper sheet or a copper foil, and the structure is lighter and thinner.

[0014] As a further scheme, the lead-out end is a copper sheet or a copper foil, and a terminal is arranged on the outer end portion of the lead-out end. The terminal is located outside the graphene electrothermal film, does not affect the thickness of the graphene electrothermal film, and is more convenient to install.

[0015] As a further scheme, the high-power heating electrode and the low-power heating electrode are selectively connected with the power supply through a gear switch.

[0016] As a further scheme, the high-power heating electrode and the low-power heating electrode are selectively connected with the power supply through an electronic switching circuit.

[0017] The utility model discloses the beneficial effect is as follows:

[0018] The flexible heating body itself belongs to a resistance body, the relationship that the resistance of two groups of opposite sides is different is utilized, high-power heating electrodes are arranged on two long sides, low-power heating electrodes are arranged on two short sides, and in actual application, high-power heating electrodes or low-power heating electrodes can be selectively powered in combination with a circuit, the change of heating temperature can be realized, the heating voltage and heating area are not changed, the heating effect is better, and the service life of the electrothermal film is not affected. DRAWINGS

[0019] Figure 1This is a structural diagram of an embodiment of the present utility model.

[0020] Figure 2 for Figure 1 Enlarged structural diagram at point C in the middle.

[0021] Figure 3 This is the equivalent circuit diagram of the medium and high power heating electrode of the utility model after being energized.

[0022] Figure 4 This is the equivalent circuit diagram of the low-power heating electrode of the utility model after being energized.

[0023] Figure 5 for Figure 1 DD cross-sectional structure diagram.

[0024] Figure 6 for Figure 5 Enlarged structural diagram at E in the middle.

[0025] Figure 7 This is a schematic structural diagram of a lead-out terminal connection scheme of the utility model.

[0026] Figure 8 This is a structural diagram of another lead-out terminal connection scheme of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] See also Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, a flexible heating element includes a rectangular graphene electric heating film 1, and electrodes 2 are provided on two opposite sides of the graphene electric heating film 1, wherein the electrodes 2 of the two long sides extend along the length direction of the long sides and constitute high-power heating electrodes A, and the electrodes 2 of the two short sides extend along the length direction of the short sides and constitute low-power heating electrodes B.

[0029] The high-power heating electrodes A are separated from the low-power heating electrodes B. The distance L1 between the two high-power heating electrodes A is smaller than the distance L2 between the two low-power heating electrodes B.

[0030] The overall characteristics of the graphene heating film 1 are the same. When the high-power heating electrode A is energized, it is equivalent to Figure 3 The connection circuit has N resistors R1 arranged side by side along the long side. When the low-power heating electrode B is energized, it is equivalent to Figure 4In the connection circuit, n resistors R2 are arranged side by side along the short side. Since the resistor R1 is shorter than the resistor R2, the resistance is smaller under the condition of the same material. When energized, the current flowing through it is larger, and the heat generation is higher. N is greater than n. Therefore, when the high-power heating electrode A is energized, it can be understood that more small-resistance electric heating films are energized, so the temperature is high, and vice versa.

[0031] The electrode 2 includes a silver adhesion layer 21 , a conductive connection layer 23 and a copper foil layer 22 . The silver adhesion layer 21 is conductively connected to the surface of the graphene electric heating film 1 , and the copper foil layer 22 is connected to the surface of the silver adhesion layer 21 through the conductive connection layer 23 .

[0032] The silver adhesion layer 21 is a silver paste adhesion layer, an electroplated silver adhesion layer or a vapor-deposited silver adhesion layer; the conductive connection layer 23 is a conductive glue bonding layer or a low-temperature solder welding layer; the thickness of the graphene electric heating film 1 is 10μm-70μm.

[0033] The graphene electric heating film 1 is mainly formed into a film shape by combining a film-forming material and graphene, and the film-forming material is mainly TPU.

[0034] The electrode 2 is provided with a lead-out terminal 3 , one end of the lead-out terminal 3 is conductively connected to the electrode 2 , and the other end of the lead-out terminal 3 extends out of the electrode 2 .

[0035] The outer ends of the two lead-out terminals 3 corresponding to the high-power heating electrode A are close to each other, and the outer ends of the two lead-out terminals 3 corresponding to the low-power heating electrode B are close to each other. Figure 7 Alternatively, the outer ends of the lead-out terminals 3 corresponding to the high-power heating electrode A and the low-power heating electrode B are close to each other, as shown. Figure 8 shown.

[0036] The lead-out end 3 is a copper sheet or copper foil, and a terminal 4 is provided on the outer end of the lead-out end 3 .

[0037] The high-power heating electrode A and the low-power heating electrode B are selectively electrically connected to the power supply through a gear switch; or, the high-power heating electrode A and the low-power heating electrode B are selectively electrically connected to the power supply through an electronic switching circuit, which is not shown in the figure.

[0038] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention, which is defined by the appended claims and their equivalents.

Claims

1. A flexible heating element, comprising a graphene electric heating film (1) in the shape of a parallelogram and having a long side and a short side, characterized in that: The two groups of opposite sides of the graphene electric heating film (1) are each provided with electrodes (2), wherein the electrodes (2) of the two long sides extend along the length direction of the long sides and constitute high-power heating electrodes (A), and the electrodes (2) of the two short sides extend along the length direction of the short sides and constitute low-power heating electrodes (B).

2. The flexible heating element according to claim 1, characterized in that: The high-power heating electrode (A) and the low-power heating electrode (B) are separated from each other.

3. The flexible heating element according to claim 1, wherein: The graphene electric heating film (1) is rectangular.

4. The flexible heating element according to claim 1, wherein: The electrode (2) comprises a silver attachment layer (21), a conductive connection layer (23) and a copper foil layer (22); the silver attachment layer (21) is conductively connected to the surface of the graphene electric heating film (1); and the copper foil layer (22) is connected to the surface of the silver attachment layer (21) via the conductive connection layer (23).

5. The flexible heating element according to claim 4, characterized in that: The silver attachment layer (21) is a silver paste attachment layer, an electroplated silver attachment layer, or a vapor-deposited silver attachment layer; the conductive connection layer (23) is a conductive glue bonding layer or a low-temperature solder welding layer; and the thickness of the graphene electric heating film (1) is 10 μm-70 μm.

6. The flexible heating element according to claim 1, wherein: The electrode (2) is provided with a lead-out terminal (3), one end of the lead-out terminal (3) is conductively connected to the electrode (2), and the other end of the lead-out terminal (3) extends outside the electrode (2).

7. The flexible heating element according to claim 6, characterized in that: The outer ends of the two lead-out terminals (3) corresponding to the high-power heating electrode (A) are close to each other, and the outer ends of the two lead-out terminals (3) corresponding to the low-power heating electrode (B) are close to each other; or, the outer ends of the lead-out terminals (3) corresponding to the high-power heating electrode (A) and the low-power heating electrode (B) are close to each other.

8. The flexible heating element according to claim 6 or 7, characterized in that: The lead-out end (3) is a copper sheet or copper foil, and a terminal (4) is provided on the outer end of the lead-out end (3).

9. The flexible heating element according to claim 1, characterized in that: The high-power heating electrode (A) and the low-power heating electrode (B) are selectively electrically connected to a power source via a gear switch.

10. The flexible heating element according to claim 1, characterized in that: The high-power heating electrode (A) and the low-power heating electrode (B) are selectively electrically connected to a power source through an electronic switching circuit.

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