| 摘要 |
A cylindrical lithium ion secondary battery includes a center pin fabricated with an inexpensive material and having a coating layer formed on the outer surface of the center pin. The cylindrical lithium ion secondary battery includes an electrode assembly having the center pin inserted through the center of the electrode. A case is provided for housing the electrode assembly and an electrolyte. A cap assembly seals the case. The center pin includes a body formed from a metallic material and a coating layer is formed on the outer surface of the body. |
