SECONDARY BATTERY

The present disclosure relates to the technical field of energy storage devices, and in particular, to a secondary battery. 1 The secondary battery 1 includes a case11, an electrode assembly 12, and a top cover assembly. The case 11 has an opening, and the electrode assembly 12 is received in the case 11. The top cover assembly includes a top cover plate 131 and an electrode terminal 132 disposed on the top cover plate 131. The top cover plate 131 is disposed at the opening. The connection sheet 14 is connected between the electrode assembly 12 and the electrode terminal 132. The secondary battery 1 provided by the present disclosure further includes an insulation thermal-dissipation member 15 disposed between the top cover plate 131 and the connection sheet 14. The insulation thermal-dissipation member 15 has a thermal conductivity larger than 1W/(m·k).