A connection structure for connecting a tab (7) of a cell with a cover board (1) comprising a tab (7) and a cover board (1) is provided. An insulating spacer (6) and an elastic conductive ring (5) are provided at an end of the cell (8). The tab passes thro...

Provided is a secondary battery comprising a core (7), tabs (4) protruded from an end of the core (7), a tab lead-out device placed at the end of the core (7), and a cover plate (1). The tab lead-out device includes an insulating layer (6) adjacent to the ...