LITHIUM SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME

摘要

In a lithium secondary cell, an improved charge-discharge characteristic and a high power are achieved. A lithium secondary cell according to the invention comprises a spirally-wound electrode assembly in which a positive electrode plate and a negative electrode are spirally wound with a sheet type separator interposed therebetween. The positive electrode plate comprises a sheet type positive electrode current collector and a positive electrode active material formed on both surfaces of the positive electrode current collector. The negative electrode plate comprises a sheet type negative electrode current collector and a negative electrode active material formed on both surfaces of the negative electrode current collector. The lithium secondary cell is characterized in that: a plurality of positive electrode current collector tabs (1d) are attached to the positive electrode plate so that an interval is formed between the plurality of the positive electrode current collector tabs in a longitudinal direction of the positive electrode plate; a plurality of negative electrode current collector tabs (2d) are attached to the negative electrode plate so that an interval is formed between the plurality of the negative electrode current collector tabs in a longitudinal direction of the negative electrode plate; and in a state of the positive electrode plate and negative electrode plate being wound together, the plurality of the positive electrode current collector tabs and the plurality of the negative electrode current collector tabs are so disposed as to face each other with the separator interposed therebetween.