Electric battery assembly and method of manufacture

An energy storage device comprising:

• a case having an opening;
• an electrode assembly disposed within the case, the electrode assembly including at least a positive and a negative electrode member;
• a cover disposed to cover the opening of the case, the cover defining a hole having a counterbore structure;
• and
• a terminal structure attached to the cover, including:
• a gasket made of an insulating material and fittingly disposed within the hole and the counterbore,
• an under cover insulator member disposed below an under side of the cover, the insulator member defining a hole corresponding to the hole in the cover,
• a washer made of a conductive material and electrically connected to one of the electrode members of the electrode assembly, the washer being disposed below the insulator member and defining a hole corresponding to the hole in the cover,
• a fastening device made of a conductive material and having a shaft passing through the gasket and the holes in the insulator member and the washer, the fastening device applying a pressure in an axial direction of the hole in the cover to press the gasket, the cover, the insulator and the washer against each other to form a seal, the fastening device being electrically connected to the washer and electrically insulated from the cover, wherein the fastening device has a head being in contact with the gasket, and
• a sealing ring disposed between the head of the fastening device and the gasket.

An energy storage device comprising:

• a case having an opening;
• an electrode assembly disposed within the case, the electrode assembly including at least a positive and a negative electrode member;
• a cover disposed to cover the opening of the case, the cover defining a hole having a counterbore structure;
• and
• a terminal structure attached to the cover, including:
• a gasket made of an insulating material and fittingly disposed within the hole and the counterbore,
• an under cover insulator member disposed below an under side of the cover, the insulator member defining a hole corresponding to the hole in the cover,
• a washer made of a conductive material and electrically connected to one of the electrode members of the electrode assembly, the washer being disposed below the insulator member and defining a hole corresponding to the hole in the cover,
• a fastening device made of a conductive material and having a shaft passing through the gasket and the holes in the insulator member and the washer, the fastening device applying a pressure in an axial direction of the hole in the cover to press the gasket, the cover, the insulator and the washer against each other to form a seal, the fastening device being electrically connected to the washer and electrically insulated from the cover, and
• a sealing ring disposed between the gasket and the cover, wherein the sealing ring comprises a separate ring member.

An energy storage device comprising:

• a case having an opening;
• an electrode assembly disposed within the case, the electrode assembly including at least a positive and a negative electrode member;
• a cover disposed to cover the opening of the case, the cover defining a hole having a counterbore structure;
• and
• a terminal structure attached to the cover, including:
• a gasket made of an insulating material and fittingly disposed within the hole and the counterbore,
• an under cover insulator member disposed below an under side of the cover, the insulator member defining a hole corresponding to the hole in the cover,
• a washer made of a conductive material and electrically connected to one of the electrode members of the electrode assembly, the washer being disposed below the insulator member and defining a hole corresponding to the hole in the cover,
• a fastening device made of a conductive material and having a shaft passing through the gasket and the holes in the insulator member and the washer, the fastening device applying a pressure in an axial direction of the hole in the cover to press the gasket, the cover, the insulator and the washer against each other to form a seal, the fastening device being electrically connected to the washer and electrically insulated from the cover, and
• a sealing ring disposed between the gasket and the cover, wherein the sealing ring is formed as an integral part of the gasket.