SECONDARY BATTERY AND BATTERY PACK

Disclosed are a secondary battery and a battery pack. By forming a through-hole in a terminal, arranging a sealing member in the through-hole, welding a first end of the sealing member to a first current collecting plate, and welding a second end of the sealing member to the terminal, the terminal is electrically connected to the first current collecting plate through the sealing member, and the terminal is not welded to the first current collecting plate. The welding positions of the sealing member and the current collecting plate fit more tightly without any gap, which ensures the welded effect while ensuring the sealing effect.