Pre-welding device for battery

The utility model belongs to the technical field of process equipment for battery assembly, and particularly relates to a pre-welding device for a battery, which comprises a platform; the first positioning unit is fixedly connected with the platform; the second positioning unit is arranged in an opening and closing mode relative to the first positioning unit in the first direction, and a containing part used for containing a battery to be processed is formed between the second positioning unit and the first positioning unit; the welding unit is fixedly connected with the platform and is used for welding the battery to be processed; the second positioning unit comprises an opening and closing support which is movably arranged in the first direction. The at least two pressing arms are arranged on the opening and closing support at intervals in the second direction; the power assembly is assembled to be capable of driving the two ends, in the second direction, of the opening and closing support to synchronously