Manufacturing method of battery roll core and battery roll core

The invention discloses a manufacturing method of a battery roll core and a battery roll core. The manufacturing method of the battery roll core comprises the following steps that: step S10, a negative electrode current collector, a positive electrode current collector and at least two diaphragms are provided, the negative electrode current collector is coated with negative electrode slurry, the negative electrode slurry forms at least two convex parts on at least one side surface of the negative electrode current collector, and two adjacent convex parts are distributed at intervals along the extension direction of the negative electrode current collector, so that a negative electrode plate can be obtained, the positive electrode current collector is coated with positive electrode slurry, so that a positive electrode plate can be obtained; and step S20, the positive electrode plate, the diaphragm, the negative electrode plate and the diaphragm are overlapped, the first end of the positive electrode plate is w