Secondary battery and cylindrical lithium secondary battery

A secondary battery comprising:

• an electrode assembly formed by winding an anode plate having an uncoated region formed on one side, a cathode plate having an uncoated region formed on the other side, and a separator disposed between the anode plate and the cathode plate;
• and
• two or more current collector plates directly contacted with the uncoated region of the anode plate or the cathode plate to be electrically connected,
• wherein each of the two or more current collector plates are pressed to be contacted across the uncoated region of the anode plate or the cathode plate.

A secondary battery comprising:

• an electrode assembly formed by winding an anode plate having an uncoated region formed on one side, a cathode plate having an uncoated region formed on the other side, and a separator disposed between the anode plate and the cathode plate;
• and
• two or more current collector plates directly contacted with the uncoated region of the anode plate or the cathode plate to be electrically connected,
• wherein the uncoated regions of the anode plate and the cathode plate are aluminum-uncoated regions and each of the two or more current collector plates is an aluminum current collector plate, and
• the cathode plate includes a material with a redox operating range of 1.0 V or more.

A cylindrical lithium secondary battery comprising:

• an electrode assembly formed by winding an anode plate having an aluminum-uncoated region formed on one side, a cathode plate having an aluminum-uncoated region formed on the other side, and a separator disposed between the anode plate and the cathode plate;
• and
• a set of current collector plates including two or more aluminum current collector plates directly contacted with the uncoated region of the anode plate or the cathode plate to be electrically connected,
• wherein the two or more aluminum current collector plates are laser welded to the aluminum-uncoated region of the anode plate or the cathode plate, and
• the cathode plate includes a material with a redox operating range of 1.0 V or more.