METHOD FOR MANUFACTURING SQUARE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a square secondary battery capable of easily charging electrolyte solution into a battery can.SOLUTION: A method for manufacturing a square secondary battery is provided. The square secondary battery includes a flat shaped power generation element, a bottomed battery can for storing the power generation element, and a battery lid for sealing an opening portion of the battery can. The method includes: a first step S2 of applying external force to the battery can to elastically deform the battery can in a direction in which a vertical wall part PW of the battery can departs from the power generation element; a second step S3 of charging electrolyte solution from an inflow port of the battery lid into the battery can; and a third step S4 of releasing the application of the external force to the battery can.