SECONDARY BATTERY

The present invention relates to a secondary battery. The secondary battery according to the present invention comprises a secondary battery, which comprises an electrode assembly, an electrolyte, and a battery case configured to accommodate the electrode assembly and the electrolyte, wherein the battery case comprises: a main body having accommodation space in which the electrode assembly and the electrolyte are accommodated; an additional electrolyte accommodation part having a storage space in which an additional electrolyte is accommodated; a connection part configured to form a moving passage through which the additional electrolyte is supplied from the addition electrolyte accommodation part to the main body; and an electrolyte impregnation member provided on the connection part and impregnated with the additional electrolyte.