Device for fixing PP film outside battery cell of lithium ion battery before pre-welding

The invention discloses a fixing device for a battery cell external PP film before pre-welding of a lithium ion battery, and belongs to the technical field of battery production. Clamping plate cylinders are arranged on two sides of the battery cell placing platform, an upper cover front-and-back movement cylinder is arranged at one end part, the clamping plate cylinders are connected with a lower clamping plate and an upper clamping plate which are correspondingly matched, and the upper cover front-and-back movement cylinder is connected with an upper cover positioning plate. The upper end of the hot-melting pen fixing frame is connected with a power supply, the middle part is connected with the hot-melting pen sliding rail, and the lower end is connected with the hot-melting pen up-and-down movement cylinder; the power source is connected with the electric heating wire, the electric heating wire is arranged on the heating wire fixing frame, the lower end of the electric heating wire is connected with the ho