Abstract: A lithium ion battery includes an anode plate and a cathode plate spirally coiled with a separator set between the anode plate and the cathode plate. The cathode plate includes a cathode current collector and a cathode film on the cathode current collector. The cathode current collector is formed with a number of cathode extending portions along a length direction thereof. The anode plate includes an anode current collector and an anode film on the anode current collector. The anode current collector is formed with a number of anode extending portions along a length direction thereof. After the cathode plate, the anode plate and the separator are coiled as a battery cell, the cathode extending portions are combined to form a cathode lead, and the anode extending portions are combined to form an anode lead. Before manufacture, the compacted cathode plate/anode plate is baked.

Abstract: An electrode group for use in lithium ion batteries includes an anode plate, a cathode plate and a separator disposed between the anode plate and the cathode plate. The anode plate includes an anode current collector and an anode film containing anode active material formed on the anode current collector. The cathode plate includes a cathode current collector and a cathode film containing cathode active material formed on the cathode current collector. The anode current collector is formed with a number of anode extending portions extending along a width direction thereof and the anode extending portions are coupled together to form an anode lead. The cathode current collector is formed with a number of cathode extending portions extending along a width direction thereof and the cathode extending portions are coupled together to form a cathode lead.