US 12,279,342 B2
Self-regulating electric heating film and preparation method and use thereof
Huawei Chen, Beijing (CN); Yantong Zhu, Beijing (CN); Zelinlan Wang, Beijing (CN); Xiaolin Liu, Beijing (CN); Zehui Zhao, Beijing (CN); and Jichen Chen, Beijing (CN)
Assigned to Beihang University, Beijing (CN)
Filed by Beihang University, Beijing (CN)
Filed on Jun. 28, 2021, as Appl. No. 17/360,846.
Claims priority of application No. 202110107591.2 (CN), filed on Jan. 27, 2021.
Prior Publication US 2022/0240351 A1, Jul. 28, 2022
Int. Cl. H05B 1/02 (2006.01); H01C 1/14 (2006.01); H01C 7/02 (2006.01); H05B 3/02 (2006.01); H05B 3/03 (2006.01); H05B 3/06 (2006.01); H05B 3/14 (2006.01); H05B 3/20 (2006.01); H05B 3/86 (2006.01)
CPC H05B 1/0294 (2013.01) [H01C 1/1406 (2013.01); H01C 7/02 (2013.01); H05B 3/02 (2013.01); H05B 3/03 (2013.01); H05B 3/06 (2013.01); H05B 3/145 (2013.01); H05B 3/20 (2013.01); H05B 3/86 (2013.01); H05B 2203/013 (2013.01); H05B 2203/02 (2013.01); H05B 2203/035 (2013.01); H05B 2214/02 (2013.01); H05B 2214/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A self-regulating electric heating film, comprising:
an insulating isolation layer,
an interdigital electrode arranged on the surface of the insulating isolation layer,
a positive temperature coefficient coating covering the surface of a secondary electrode of the interdigital electrode, and
an insulating protective layer covering the surface of a primary electrode of the interdigital electrode, wherein:
the positive temperature coefficient coating is not in contact with the primary electrode of the interdigital electrode;
the insulating protective layer overlaps the positive temperature coefficient coating;
the nano conductive filler is a mixture of conductive carbon black and carbon nanotube, and a mass ratio of the conductive carbon black to the carbon nanotube is 5:1; and
the insulating isolation layer has a thickness of 10-30 μm, the positive temperature coefficient coating has a thickness of 30-90 μm, and the insulating protective layer has a thickness of 10-30 μm.