| 摘要 |
PROBLEM TO BE SOLVED: To improve the safety while restraining the heat generation even if overcharge and internal short-circuit is generated by fitting a positive electrode lead terminal and a negative electrode lead terminal to the inner peripheral part of a positive plate and a negative plate provided in a power generation element with a separator. SOLUTION: An elliptic winding type power generating element is housed in a case so that the winding center axis thereof is arranged nearly vertical to an opening part of the bag-like battery case having the airtight structure formed of a metal laminated resin film capable of being manufactured at a low cost and capable of reducing the weight. A positive electrode lead terminal 4 and a negative electrode lead terminal 5 are respectively fitted to the ends of the most inner peripheral part of a positive plate 6 and a negative plate 7 forming the power generating element with a separator. In the case where heat is generated in the abnormal condition, heat is radiated from the positive electrode lead terminal 4 and the negative electrode lead terminal 5 having the predetermined thickness and made of Cu, Al, Ni, Ti or stainless steel having excellent heat conductivity and fitted to the inner peripheral part of the power generating element, of which temperature is easy to be raised due to the bad heat radiating property. With this structure, lowering of battery characteristic can be prevented without complicating a manufacturing process. |
