Cathode sheet and lithium ion electric roll using the same

A wound bare electric roll comprising a cathode sheet having a cathode current collector, an anode sheet, and a separator;

• the separator being arranged between the cathode sheet and the anode sheet;
• the cathode sheet comprising a head, a tail, and an anti-puncture cushion;
• the head being an innermost end of the cathode sheet in the wound bare electric roll, and the tail being an outermost end of the cathode sheet in the wound bare electric roll, wherein the cathode current collector has a first side face and a second side face opposite to the first side face;
• the tail comprises a first tail exposed zone arranged on the first side face of the cathode current collector defined between a tail adhesive application zone and an ending adhesive application zone, wherein the tail adhesive application zone is covered by a tail protective adhesive and the ending adhesive application zone is covered by an ending adhesive, wherein the tail protective adhesive is arranged on the first side face of the cathode current collector, wherein the tail adhesive application zone is closer to the head than the first tail exposed zone along a length direction of the cathode sheet, wherein the first tail exposed zone is closer to the head than the ending adhesive application zone along a length direction of the cathode sheet;
• the anti-puncture cushion is arranged on the first tail exposed zone;
• and
• the anti-puncture cushion at least wraps around one corner of the anode sheet,
• wherein the second side face of the cathode current collector comprises a second coating zone covered by a second active substance layer and a second tail exposed zone along the length direction of the cathode sheet, and the anti-puncture cushion is separated from the second coating zone by a part of the first tail exposed zone or the second tail exposed zone along the length direction of the cathode sheet, and
• a whole adhesive face of the anti-puncture cushion is directly bonded to the first tail exposed zone or the second tail exposed zone.