Battery separator and coating process thereof, coating system and battery
The present disclosure relates to the field of lithium battery separators, and aims to provide a battery separator and a coating process thereof, a coating system and a battery. The coating process includes: initial heat setting of a polyolefin membrane, online coating of the polyolefin membrane, and heat setting of a coating membrane. The coating system includes a plurality of drying ovens disposed in a travel route of heat setting of a polyolefin membrane, and a coating apparatus for coating a coating slurry on the polyolefin membrane, which is disposed at a spacing position of adjacent drying ovens. When the online coating flow is disposed before the end of the heat setting of the polyolefin membrane, the polyolefin base membrane and the coating slurry are dried by using the temperature of the heat setting drying oven of the polyolefin membrane.
1 . A coating process of a battery separator, sequentially comprising: initial heat setting of a polyolefin membrane, online coating of the polyolefin membrane, and heat setting of a coating membrane, wherein between the online coating of the polyolefin membrane and the heat setting of the coating membrane, the coating membrane is retracted 0.1% to 10% along a machine direction (MD).
2 . The coating process of claim 1 , wherein, a temperature of the initial heat setting of the polyolefin membrane is controlled to 70° C. to 120° C., and a temperature of the heat setting of the coating membrane is controlled to 70° C. to 130° C.
3 . The coating process of claim 1 , wherein, a coating layer of the coating membrane is any one or combination of two or more of a ceramic coating layer, a polyvinylidene difluoride (PVDF) coating layer, a polyacrylic acid coating layer, and an aramid coating layer.
4 . The coating process of claim 1 , wherein, the online coating of the polyolefin membrane is performed in a manner which comprises any one or a combination of several of spray coating, blade coating, gravure coating, bar coating, slot die coating, extrusion coating and dip coating.