US Patent 11876162 Pouch forming method and pouch forming device

A pouch forming method and a pouch forming device are provided. In particular, the pouch forming method for forming an accommodation part that accommodates an electrode assembly in a pouch sheet includes a seating process of seating the pouch sheet on a top surface of a lower die in which a forming groove is formed in an upper portion thereof. In a vacuum elongation process, a lower portion of the pouch sheet, in which the accommodation part is formed, is elongated by vacuum, and in an accommodation part formation process, the portion of the pouch sheet, which is elongated by the vacuum, is pressed by a punch disposed above the pouch sheet in a direction in which the forming groove is formed to form the accommodation part.