Core Structure for a Circular Lithium Secondary Battery

A core structure for a circular lithium secondary battery being disposed in a case of the battery and electrically connected to positive and negative terminals of the battery by two connecting members, the core structure comprising:

• a core disposed in the case;
• an electrode assembly including at least one positive layer, one separating layer and one negative layer, wherein the positive layer, the separating layer and the negative layer are superposed one another and wind around the core, an uncoated area is formed at a side of the positive layer for use as a positive lead area, and the negative layer is formed at another side thereof opposite the positive layer with an uncoated area for use as a negative lead area, the positive and negative lead areas protrude out of both sides of the electrode assembly, respectively;
• two conductive fixing assemblies each including at least one fastener and at least one conductive pressing piece, wherein the conductive pressing piece is disposed outside the positive lead area or the negative lead area, the conductive pressing piece is fixed on the core by inserting the fastener through the through hole of the conductive pressing piece, so that the conductive pressing piece is firmly pressed against the positive lead area or the negative lead area, and the positive lead area or the negative lead area is maintained in a close electrical contact with the conductive pressing piece, the conductive fixing assemblies are initially connected to the connecting members and then electrically connected to the positive lead terminal or the negative lead terminal.