| abstract |
An object of the present invention is to provide a lithium secondary battery excellent in productivity and space saving and having reduced internal resistance. A positive current collector and a negative current collector are connected to end portions of a positive electrode plate and a negative electrode plate constituting a wound internal electrode body or a laminated internal electrode body, respectively, for leading out current. It is a lithium secondary battery provided with members. At least one of the positive electrode current collecting member 4A and the negative electrode current collecting member includes the main body 12, the first convex portion 31, and the second convex portion 32, and at least one of the positive electrode plate 22 and the negative electrode plate. The second projection 32 is irradiated with the energy beam 53 in a state where the protruding end face of the first projection 31 is positioned on the connection edge 6 of the first and second electrodes 4A and 4A and at least one of the positive electrode current collecting member 4A and the negative electrode current collecting member. , And at least one end 15 of the positive electrode plate 22 and the negative electrode plate is connected by welding. [Selection diagram] Fig. 1 |