Typical Li-ion rechargeable battery electrode manufacturing process consists of slurry mixing, coating / drying, slitting, calendaring process. In these processes, the drying process has a huge impact on the performance of the battery. The electrode drying oven was numerically studied using CFD method. The oven consists of eight drying zones in series. In this paper, various line speed cases were studied and compared to find optimal line speed. The CFD analysis results include the air flow inside the drying oven, the electrode coating surface temperature and the residual amount of water of each drying zone.