What is the coating process in lithium ion battery manufacturing?

General process flow of coating: The coated substrate (metal foil) is unwound by the unwinding device and fed into the coating machine. After the head and tail of the substrate are connected into a continuous belt at the splicing table, they are fed into the tension adjustment device and the automatic deviation correction device by the pulling device, and enter the coating device after adjusting the sheet path tension and sheet path position. The electrode slurry is coated in sections according to the predetermined coating amount and blank length in the coating device. When double-sided coating is applied, the coating is automatically tracked by the front coating and blank length. The wet electrode after coating is sent to the drying channel for drying, and the drying temperature is set according to the coating speed and coating thickness. The dried electrode is rolled up after tension adjustment and automatic deviation correction for processing in the next step.

In view of the energy efficiency of single-layer coating machines and the oxidation of aluminum foil, some advanced companies have developed double-sided simultaneous coating technology, which completely solves the oxidation problem of aluminum foil during coating, but the price of double-sided simultaneous coating machines is not affordable for general battery manufacturers.

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