A pouch contact type battery cell is provided. The cell includes a gap filling member that is positioned inside a plurality of cell covers that are made of an aluminum material and enclose two pouches and remove a non-contact gap G for preventing electrical insulation breakdown of the pouches and the cell covers in the contacted state with extending portions of the pouches, respectively. A battery module includes a battery cell unit in which the plurality of pouch contact type battery cells are stacked and a battery system includes the battery module. Accordingly, performance of an electric vehicle or a hybrid vehicle is improved due to a reduction in weight based on the reduction in size and volume.