Battery, Electrical Equipment and Preparation Method and Preparation Device for Battery

A preparation method for a battery, comprising:

• providing multiple battery cells, wherein each battery cell comprises a shell, an electrode terminal, and an insulation layer, wherein the shell comprises a first wall, wherein the first wall comprises a body and a first convex part, wherein the body has an inner surface and an outer surface arranged oppositely to each other in a thickness direction thereof, and the first convex part protrudes from the outer surface in a direction away from an inner part of the battery cells, wherein the electrode terminal is arranged on the body, and the insulation layer covers and is fixed on the first convex part;
• providing a box, wherein the box is provided with an accommodating cavity with an opening;
• and
• accommodating the multiple battery cells in the accommodating cavity, and bonding the insulation layer with a cover piece covering the opening to fixedly connect the multiple battery cells to the cover piece.