Battery having enhanced electrical insulation capability

摘要

Disclosed is a battery including a cathode in which cathode active-material coating layers provided on both surfaces of a cathode collector are longitudinally deviated from each other, and an anode having at least one anode active-material coating layer provided on an anode collector, the cathode and anode being wound to face each other with a separator interposed therebetween. At least one of a winding beginning portion and winding ending portion of the cathode is provided with a cathode uncoated part for installation of a cathode lead. An insulator tape is attached to the boundary of the cathode active-material coating layer at a position where the anode active-material coating layer faces a non-coating part of the cathode not containing the cathode active-material coating layer, achieving enhanced electrical insulation capability and consequential safety of the battery.

主权项

1. A battery comprising:
a cathode having a cathode active-material coating layer provided on at least one surface of a cathode collector; and an anode having an anode active-material coating layer provided on at least one surface of an anode collector, the cathode and anode being wound to face each other with a separator interposed therebetween, wherein the cathode active-material coating layer applied to the at least one surface of the cathode collector is longitudinally deviated from a cathode active-material coating layer applied to the other surface of the cathode collector such that application beginning and ending portions of both the cathode active-material coating layers are not consistent with each other, wherein the cathode is provided at a winding beginning portion and winding ending portion thereof with cathode uncoated parts, respectively, wherein the cathode has the cathode uncoated parts at both distal ends of the cathode collector, wherein the cathode uncoated part is a non-coating part of the cathode not containing the cathode active-material coating layer, wherein a cathode lead is installed to at least one of the cathode uncoated parts of the winding beginning portion and winding ending portion, wherein a first insulator tape and a second insulator tape are attached to the boundaries of cathode active-material coating layers provided at upper and lower surfaces of the cathode collector at a tip end of the cathode, a third insulator tape and a fourth insulator tape are attached to the boundaries of the cathode active-material coating layers provided at the upper and lower surfaces of the cathode collector at the ending portion of the cathode, and a fifth insulator tape is attached to a surface of the cathode uncoated part at the distal end of the cathode collector opposite to where the cathode lead is located, and wherein the cathode lead does not contact the fifth insulator tape.