Electrical energy storage device and manufacturing method for the same

A manufacturing method for an electrical energy storage device including an electrode body including an electrode, a case main body that includes an opening and accommodates the electrode body, a sealing plate that includes a terminal extraction hole and seals the opening of the case main body, a current collecting part that is electrically connected to the electrode inside the case main body and includes a penetration hole, a terminal that includes a shaft part inserted to the terminal extraction hole and the penetration hole and a caulking part provided at one end part of the shaft part on a side of the case main body and caulked to a periphery of the penetration hole, a step part that is provided at a side surface of the penetration hole of the current collecting part and has at least a part of the caulking part of the terminal disposed therein, and a welding bonding part between a peripheral part of the penetration hole of the current collecting part and the caulking part of the terminal, the manufacturing method comprising:

• an assembling step of inserting the shaft part of the terminal to the terminal extraction hole of the sealing plate and the penetration hole of the current collecting part, thereby assembling the terminal, the sealing plate, and the current collecting part;
• a caulking step of, after the assembling step, deforming one end of the shaft part of the terminal, thereby forming the caulking part;
• and
• a welding bonding step of, after the caulking step, welding the caulking part to the periphery of the penetration hole of the current collecting part, thereby forming the welding bonding part, wherein in the welding bonding step, a space is provided between the current collecting part and the terminal in a vicinity of the welding bonding part.