Connection member, battery and battery pack

A battery, comprising:

• a current collector comprising a plurality of electrode plates laminated to each other, each of the plurality of electrode plates comprising a tab;
• and
• a conductive connection assembly comprising a connection member for electrically connecting a plurality of tabs of the current collector, the connection member comprising:
• a connection plate;
• and
• at least one protrusion arranged on the connection plate and protruding from one side surface of the connection plate in a thickness direction of the connection plate, wherein:
• at least one end of each of the at least one protrusion in a length direction of the at least one protrusion is formed as a tip in a plane perpendicular to the thickness direction of the connection plate;
• the tip is configured to puncture the plurality of tabs in the length direction of the at least one protrusion;
• and
• the at least one protrusion of the connection member penetrates the plurality of tabs and is electrically connected to the tabs,
• wherein each of the at least one protrusion comprises a main section and a spike section that are connected to each other on the one side surface of the connection plate, wherein the spike section is connected to at least one end of the main section, and wherein in the length direction of the at least one protrusion, the main section extends straightly and has an identical cross section, and the spike section is formed as the tip in the plane perpendicular to the thickness direction of the connection plate.