Flexible electric heating film

Abstract

The utility model discloses a flexible electric heating film, which comprises an input interface area, an output interface area, a lower base film and an upper base film which are arranged between the input interface area and the output interface area and are superposed, a plurality of heating units are arranged between the lower base film and the upper base film along the length direction, and adjacent heating units are electrically connected through a first metal lead. The heating units located at the two ends of the lower base film and the upper base film are electrically connected with the input interface area and the output interface area respectively. Each heating unit comprises a plurality of second metal wires arranged in parallel, the surfaces of the second metal wires are coated with insulating layers, a first spacer region is arranged between every two adjacent second metal wires and connected end to end, a second spacer region is arranged between every two adjacent heating units, and the width of the second spacer region is larger than that of the first spacer region. According to the flexible electric heating film provided by the utility model, the heating value reduction and uneven heating of the heating film caused by short circuit between the metal wires are avoided, so that the heating uniformity and reliability of the electric heating film are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating films, in particular to a flexible electric heating film. Background Art

[0002] In the field of new energy vehicles, power batteries are used to provide power for vehicles. When working, the battery pack has strict requirements on its own temperature. Therefore, in order to ensure the service life and safety of the battery pack, a corresponding battery pack heating system needs to be designed for lithium batteries. The commonly used heating methods are PTC (positive temperature coefficient) heating, liquid heating and electric heating film heating. The battery is heated mainly by a flexible heating sheet to heat the outer surface of the battery. The flexible heating sheet is a patterned heating layer set between two insulating layers.

[0003] During the process of the electric heating film heating the battery, the electric heating film itself will produce expansion stress and will also be affected by the expansion stress of the battery, causing the heating wire inside the electric heating film to easily shift in position under the action of stress, or even the heating wires to contact each other, causing the internal electrical circuit to change and causing uneven heating of the electric heating film. The reliability of the electric heating film is poor. Utility Model Content

[0004] The utility model aims to provide a flexible electric heating film, which avoids the decrease in heating value and uneven heating of the heating film caused by short circuit between metal wires, thereby improving the uniformity and reliability of heating of the electric heating film.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a flexible electric heating film, comprising: an input interface area, an output interface area, a lower base film and an upper base film stacked between the input interface area and the output interface area, a plurality of heating units disposed between the lower base film and the upper base film and along the length direction, adjacent heating units being electrically connected through a first metal wire, and the heating units located at both ends of the lower base film and the upper base film being electrically connected to the input interface area and the output interface area respectively;

[0006] The heating unit includes a plurality of second metal wires arranged in parallel, the surface of the second metal wires is coated with an insulating layer, there is a first spacing area between adjacent second metal wires and they are connected end to end, there is a second spacing area between adjacent heating units, and the width of the second spacing area is greater than that of the first spacing area.

[0007] The further improved scheme in the above technical scheme is as follows:

[0008] 1. In the above solution, a first temperature control chip is arranged between the input interface area and the corresponding heating unit, and a second temperature control chip is arranged between the output interface area and the corresponding heating unit.

[0009] 2. In the above solution, the lower base film or the upper base film has two openings, and the first temperature control chip and the second temperature control chip are respectively located inside the corresponding openings.

[0010] 3. In the above scheme, the lower base film and the upper base film are PET film, PE film, or PI film.

[0011] 4. In the above solution, the input interface area and the output interface area are located on the lower base film or the upper base film.

[0012] 5. In the above solution, the lower base film or the upper base film has an extension portion, and the input interface area and the output interface area are located on the extension portion.

[0013] 6. In the above solution, an adhesive layer is provided on the upper surface of the lower base film and / or the lower surface of the upper base film.

[0014] 7. In the above solution, an adhesive layer is provided on the surface of the first metal wire and the second metal wire.

[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0016] The utility model provides a flexible electric heating film, whose heating unit comprises a plurality of second metal wires arranged in parallel, wherein adjacent heating units are electrically connected via the first metal wires, the surface of the second metal wires of the heating units is coated with an insulating layer, and adjacent second metal wires are connected end to end, thereby avoiding short circuits caused by mutual contact between the first metal wires and the second metal wires, and between adjacent second metal wires, and especially the increased risk of metal wire contact due to alternating hot and cold, resulting in decreased heating value and uneven heating of the heating film, thereby improving the uniformity and reliability of heating of the electric heating film; further, there is a first spacing area between adjacent second metal wires, and a second spacing area between adjacent heating units, the width of the second spacing area being greater than that of the first spacing area, which is conducive to concentrating heat on the heating unit, improving heat effectiveness, and thus saving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is a three-dimensional diagram of the overall structure of the flexible electric heating film of the utility model;

[0018] Attached Figure 2 It is a schematic cross-sectional view taken along line A-A' of the first embodiment of the utility model;

[0019] Attached Figure 3 It is a schematic cross-sectional view taken along line A-A' of a second embodiment of the utility model;

[0020] Attached Figure 4This is a schematic diagram of the internal structure of the flexible electric heating film of the utility model;

[0021] Attached Figure 5 For the utility model Figure 4 An enlarged schematic diagram of point B;

[0022] Attached Figure 6 It is a schematic cross-sectional view of the local structure of the third embodiment of the utility model.

[0023] In the above figures: 1, heating unit; 101, second metal wire; 2, insulation layer; 3, input interface area; 4, output interface area; 5, first metal wire; 61, first temperature control chip; 62, second temperature control chip; 7, extension part; 8, lower base film; 9, upper base film; 10, opening; 11, second spacing area; 12, adhesive layer; 13, first spacing area. DETAILED DESCRIPTION

[0024] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0025] Embodiment 1: A flexible electric heating film, comprising: an input interface area 3, an output interface area 4, a lower base film 8 and an upper base film 9 stacked between the input interface area 3 and the output interface area 4, a plurality of heating units 1 disposed between the lower base film 8 and the upper base film 9 and along the length direction, adjacent heating units 1 being electrically connected via a first metal wire 5, and the heating units 1 located at both ends of the lower base film 8 and the upper base film 9 being electrically connected to the input interface area 3 and the output interface area 4, respectively;

[0026] The heating unit 1 includes a plurality of second metal wires 101 arranged in parallel, the surface of the second metal wires 101 is coated with an insulating layer 2, a first spacing area 13 is provided between adjacent second metal wires 101 and the wires are connected end to end, and a second spacing area 11 is provided between adjacent heating units 1, and the width of the second spacing area 11 is greater than the width of the first spacing area 13.

[0027] A first temperature control chip 61 is disposed between the input interface area 3 and the corresponding heating unit 1 , and a second temperature control chip 62 is disposed between the output interface area 4 and the corresponding heating unit 1 .

[0028] The upper base film 9 has two openings 10 , and the first temperature control chip 61 and the second temperature control chip 62 are located inside the corresponding openings 10 , respectively.

[0029] The lower base film 8 and the upper base film 9 are both PET films.

[0030] The above-mentioned input interface area 3 and output interface area 4 are located on the lower base film 8 .

[0031] The lower base film 8 has an extension portion 7 , and the input interface area 3 and the output interface area 4 are located on the extension portion 7 .

[0032] An adhesive layer 12 is provided on the upper surface of the lower base film 8 and the lower surface of the upper base film 9 .

[0033] An adhesive layer can be obtained by coating the upper surface of the lower base film and the lower surface of the upper base film at the same time, and a metal wire is printed on the adhesive layer that has not been completely cured, and then the upper base film and the lower base film are stacked to cover the printed metal wire between the upper base film and the lower base film;

[0034] The diameter of the second metal wire 101 is 10 μm, and the diameter of the first metal wire 5 is the same as that of the second metal wire 101 .

[0035] Embodiment 2: A flexible electric heating film, comprising: an input interface area 3, an output interface area 4, a lower base film 8 and an upper base film 9 stacked between the input interface area 3 and the output interface area 4, a plurality of heating units 1 disposed between the lower base film 8 and the upper base film 9 and along the length direction, adjacent heating units 1 being electrically connected via a first metal wire 5, and the heating units 1 located at both ends of the lower base film 8 and the upper base film 9 being electrically connected to the input interface area 3 and the output interface area 4, respectively;

[0036] The probability of the first metal wire and the second metal wire, and the probability of the adjacent second metal wires contacting each other is reduced, so that the electric heating circuit can be prevented from changing, the uniformity of the overall heating of the electric heating film is improved, and the reliability of the use of the electric heating film is improved;

[0037] The heating unit 1 includes a plurality of second metal wires 101 arranged in parallel, the surface of the second metal wires 101 is coated with an insulating layer 2, a first spacing area 13 is provided between adjacent second metal wires 101 and the wires are connected end to end, and a second spacing area 11 is provided between adjacent heating units 1, and the width of the second spacing area 11 is greater than the width of the first spacing area 13.

[0038] A first temperature control chip 61 is disposed between the input interface area 3 and the corresponding heating unit 1 , and a second temperature control chip 62 is disposed between the output interface area 4 and the corresponding heating unit 1 .

[0039] The lower base film 8 and the upper base film 9 are PI films.

[0040] The above-mentioned input interface area 3 and output interface area 4 are located on the upper base film 9 .

[0041] An adhesive layer 12 is disposed on the upper surface of the lower base film 8 .

[0042] For the adhesive layer, the adhesive layer can be obtained by coating the upper surface of the lower base film, printing the metal wire on the adhesive layer that has not been completely cured, and then stacking the upper base film and the lower base film to cover the printed metal wire between the upper base film and the lower base film;

[0043] The diameter of the second metal wire 101 is 200 μm.

[0044] Embodiment 3: A flexible electric heating film, comprising: an input interface area 3, an output interface area 4, a lower base film 8 and an upper base film 9 stacked between the input interface area 3 and the output interface area 4, a plurality of heating units 1 disposed between the lower base film 8 and the upper base film 9 and along the length direction, adjacent heating units 1 being electrically connected via a first metal wire 5, and the heating units 1 located at both ends of the lower base film 8 and the upper base film 9 being electrically connected to the input interface area 3 and the output interface area 4, respectively;

[0045] The heating unit 1 includes a plurality of second metal wires 101 arranged in parallel, the surface of the second metal wires 101 is coated with an insulating layer 2, a first spacing area 13 is provided between adjacent second metal wires 101 and the wires are connected end to end, and a second spacing area 11 is provided between adjacent heating units 1, and the width of the second spacing area 11 is greater than the width of the first spacing area 13.

[0046] A first temperature control chip 61 is disposed between the input interface area 3 and the corresponding heating unit 1 , and a second temperature control chip 62 is disposed between the output interface area 4 and the corresponding heating unit 1 .

[0047] The upper base film 9 has two openings 10 , and the first temperature control chip 61 and the second temperature control chip 62 are located inside the corresponding openings 10 , respectively.

[0048] The lower base film 8 and the upper base film 9 are PBT films.

[0049] The above-mentioned input interface area 3 and output interface area 4 are located on the lower base film 8 .

[0050] The surfaces of the first metal wire 5 and the second metal wire 101 are both provided with an adhesive layer 12; the metal wire to be printed can be first passed through the molten insulating material, and then the insulating material is solidified on the surface of the metal wire and then passed through the adhesive before being printed onto the lower base film, thereby forming an adhesive layer to achieve the connection and fixation between the upper and lower base films and the metal wires.

[0051] The diameter of the second metal wire 101 is 300 μm.

[0052] When the above-mentioned flexible electric heating film is used, it avoids short circuits caused by contact between the first metal wire and the second metal wire, and between adjacent second metal wires, and especially the increased risk of metal wire contact due to alternating hot and cold, which leads to a decrease in the heating value of the heating film and uneven heating, thereby improving the uniformity and reliability of the heating of the electric heating film; further, there is a first spacing area between adjacent second metal wires, and a second spacing area between adjacent heating units, and the width of the second spacing area is greater than that of the first spacing area, which is conducive to concentrating heat on the heating unit, improving the heat effectiveness, and thus saving energy consumption.

[0053] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A flexible electric heating film, comprising: An input interface area (3) and an output interface area (4), characterized in that: a lower base film (8) and an upper base film (9) are stacked between the input interface area (3) and the output interface area (4); a plurality of heating units (1) are arranged between the lower base film (8) and the upper base film (9) and along the length direction; adjacent heating units (1) are electrically connected via a first metal wire (5); and the heating units (1) located at both ends of the lower base film (8) and the upper base film (9) are electrically connected to the input interface area (3) and the output interface area (4), respectively; The heating unit (1) comprises a plurality of second metal wires (101) arranged in parallel, the surface of the second metal wires (101) being coated with an insulating layer (2), a first spacing area (13) being provided between adjacent second metal wires (101) and being connected end to end, and a second spacing area (11) being provided between adjacent heating units (1), the width of the second spacing area (11) being greater than the width of the first spacing area (13).

2. The flexible electric heating film according to claim 1, characterized in that: A first temperature control chip (61) is provided between the input interface area (3) and the corresponding heating unit (1), and a second temperature control chip (62) is provided between the output interface area (4) and the corresponding heating unit (1).

3. The flexible electric heating film according to claim 2, characterized in that: The lower base film (8) or the upper base film (9) has two openings (10), and the first temperature control chip (61) and the second temperature control chip (62) are respectively located inside the corresponding openings (10).

4. The flexible electric heating film according to claim 1, characterized in that: The lower base film (8) and the upper base film (9) are PET films, PE films, or PI films.

5. The flexible electric heating film according to claim 1, characterized in that: The input interface area (3) and the output interface area (4) are located on the lower base film (8) or the upper base film (9).

6. The flexible electric heating film according to claim 5, characterized in that: The lower base film (8) or the upper base film (9) has an extension portion (7), and the input interface area (3) and the output interface area (4) are located on the extension portion (7).

7. The flexible electric heating film according to claim 1, characterized in that: An adhesive layer (12) is provided on the upper surface of the lower base film (8) and / or the lower surface of the upper base film (9).

8. The flexible electric heating film according to claim 1, characterized in that: An adhesive layer (12) is provided on the surfaces of the first metal wire (5) and the second metal wire (101).

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