Secondary battery comprising insulated tab group

A secondary battery comprising:

• an electrode body including a positive electrode plate and a negative electrode plate;
• an exterior body having an opening and housing the electrode body;
• a sealing plate sealing the opening;
• an external positive terminal and an external negative terminal provided outside the sealing plate, the external positive terminal and the external negative terminal being arranged along a longitudinal direction of the sealing plate;
• a connection member provided inside the sealing plate and connected to one of the external positive terminal or the external negative terminal;
• an insulating member provided between the sealing plate and the connection member;
• and
• a current collector disposed inside the sealing plate and connected to the connection member and a tab group including a plurality of current collector tabs extending from the positive electrode plate or the negative electrode plate, wherein:
• the sealing plate, the insulating member and the current collector overlap each other along a stacked direction,
• each of the plurality of current collector tabs partially overlaps with an adjacent current collector tab with a shift along the longitudinal direction,
• at least some of the current collector tabs of the tab group have a projecting portion extending from an inside of the current collector to an outside of the current collector and crossing an outermost peripheral end of the current collector, in the longitudinal direction of the sealing plate in a plan view which is viewed along the stacked direction, and
• the insulating member has an extending portion at least extending between the projecting portion and the sealing plate along the longitudinal direction of the sealing plate.