| 摘要 |
<P>PROBLEM TO BE SOLVED: To produce a high capacity and a high output while securing safety by reducing the deviation of temperature distribution inside an electrode. <P>SOLUTION: A shaft core 10 of a wound electrode group is formed by bonding an aluminum positive electrode shaft core part 12 and a copper negative electrode shaft core part 11 together while insulating them from each other with an insulating material 13. The positive electrode shaft core part 12 has a positive electrode current collecting plate 12b formed at one end, and a joint portion 12J formed at the other end to form a "shiplap" joint in the thickness direction. The negative electrode shaft core part 11 has a negative electrode current collecting plate 11b formed at one end, and a joint portion 11J formed at the other end. The positive electrode shaft core part 12 and the negative electrode shaft core part 11 are bonded at their joint portions together with the insulating material 13 over both sides of which an adhesive material is applied. To current collecting portions 12a, 11a of the positive electrode shaft core part 12 and the negative electrode shaft core part 11, aluminum and copper electrode connection plates are connected, respectively, with ultrasonic welding. Thus, the shaft core is connected to an external thermal load in an electrical and heat conductive manner. <P>COPYRIGHT: (C)2011,JPO&INPIT |
