A secondary battery includes a case, at least one electrode assembly housed in the case, and a cap plate coupled to the case, a terminal protruding through the cap plate, a collector between the cap plate and the electrode assembly electrically coupling the terminal and the electrode assembly, and an insulation member between the collector and the electrode assembly. The insulation member may include a flow passage between the collector and the insulation member configured to allow an electrolyte of the secondary battery to flow through.