A battery, comprising: a battery housing having at least an opening end; a battery cover sealing the opening end; an electric core received in the battery housing which comprises at least a heat-conducting member, the heat-conducting member having at least an end penetrating through the battery cover; and an electrolyte filled in a space formed by the battery housing with the battery cover; the electric core comprising: an insulating roll core with the heat-conducting member at least partially received therein; and a positive plate having a positive tab, a negative plate having a negative tab and a separator between the positive plate and the negative plate which are wound on the insulating roll core, wherein the heat-conducting member is thermally connected with at least one of the positive tab and the negative tab; the heat-conducting member comprising a positive heat-conducting member and a negative heat-conducting member which are electrically insulated from each other; the positive heat-conducting member being electrically connected with the positive tab and insulated from the negative tab; the negative heat-conducting member being electrically connected with the negative tab and insulated from the positive tab; and the positive heat-conducting member and the negative heat-conducting member penetrating through the battery cover respectively; an insulating layer being formed on an external surface of the heat-conducting member; the positive heat-conducting member, the negative heat-conducting member and the insulating layer being integrally formed to form the insulating roll core which is wound with the positive plate, the negative plate and the separator between the positive plate and the negative plate to form the electric core. a battery housing having at least an opening end; a battery cover sealing the opening end; an electric core received in the battery housing which comprises at least a heat-conducting member, the heat-conducting member having at least an end penetrating through the battery cover; and an electrolyte filled in a space formed by the battery housing with the battery cover; the electric core comprising: an insulating roll core with the heat-conducting member at least partially received therein; and a positive plate having a positive tab, a negative plate having a negative tab and a separator between the positive plate and the negative plate which are wound on the insulating roll core, wherein the heat-conducting member is thermally connected with at least one of the positive tab and the negative tab; the heat-conducting member comprising a positive heat-conducting member and a negative heat-conducting member which are electrically insulated from each other; the positive heat-conducting member being electrically connected with the positive tab and insulated from the negative tab; the negative heat-conducting member being electrically connected with the negative tab and insulated from the positive tab; and the positive heat-conducting member and the negative heat-conducting member penetrating through the battery cover respectively; an insulating layer being formed on an external surface of the heat-conducting member; the positive heat-conducting member, the negative heat-conducting member and the insulating layer being integrally formed to form the insulating roll core which is wound with the positive plate, the negative plate and the separator between the positive plate and the negative plate to form the electric core.