SECONDARY BATTERY HAVING A DIFFERENTIAL LEAD STRUCTURE

摘要

A secondary battery having a differential lead structure according to one aspect of the present invention comprises: an electrode assembly including a positive electrode plate having a positive electrode tap, a negative electrode plate having a negative electrode tap, and a separation layer interposed between the positive electrode plate and the negative electrode plate; a battery case receiving the electrode assembly; a positive electrode lead electrically connected to the positive electrode tap; and a negative electrode lead formed of a different material from that of the positive electrode lead and electrically connected to the negative electrode tap. Each of the positive electrode lead and the negative electrode lead has a mutually different sectional area. The sectional area of a lead having low electrical conductivity is greater than that of a lead having high electrical conductivity.