A secondary battery includes: a plurality of temperature sensing units that is in close contact with an exterior and senses a temperature of respective areas of the exterior; and an insulating film defining an outer surface of the exterior and having electrical insulation, wherein one or more of the plurality of temperature sensing units include: a positive temperature coefficient element; and a negative temperature coefficient element, and the plurality of temperature sensing units are covered by the insulating film. A method for manufacturing the secondary battery, and a battery module are also provided.