2results about How to "Avoid dark spots" patented technology

This utility model discloses a sealing head structure and a battery, relating to the field of battery manufacturing technology. Specifically, it includes a heat-sealing head, a heat-insulating layer, and a cold-sealing head. The heat-insulating layer is connected to one side wall of the heat-sealing head; the cold-sealing head is connected to the side wall of the heat-insulating layer away from the heat-sealing head. The heat-insulating layer blocks heat transfer between the heat-sealing head and the cold-sealing head. This application uses a heat-insulating layer between the heat-sealing head and the cold-sealing head to block heat transfer, enabling the cold-sealing head to effectively cool and protect against the spread of heat radiation, thus protecting the inner layer of the aluminum-plastic film from damage. This significantly reduces process defects caused by heat radiation and avoids cell gas expansion caused by the inability to expel gas in time. It effectively improves the formation interface, avoids defects such as black spots or lithium plating during the formation process, and is beneficial for improving battery electrical and safety performance while reducing production costs.

The utility model provides a kind of electric core, cylindrical battery and electric equipment, the electric core is wound to form cylindrical shape by pole piece and diaphragm, the pole piece includes current collector and active material layer, active material layer is at least partially arranged in the thickness direction of current collector at least one side, active material layer is equipped with multiple recessed structures on the surface away from current collector, the area proportion of recessed structure gradually decreases in the direction from the winding starting end to the terminal end of pole piece, the electric core can improve the infiltration effect of electrolyte to the inner ring pole piece of cylindrical battery.