摘要 |
PURPOSE:To remove cell expansion and improve cell characteristics, by making diameters of a lithium plate and an aluminum one, which are inserted into a negative electrode can when a cell being assembled, smaller than an inner diameter of the negative electrode can so that the cell expansion and internal short-circuit are prevented from occurring caused by expansion of the negative electrode during alloying time inside the cell. CONSTITUTION:Diameters of a lithium plate and aluminum one inserted into a negative electrode can, when a cell being assembled, are made to be 2-7% smaller than an internal diameter of the negative electrode can. A desirable degree, by which those diameters of the lithium plate and aluminum one are made to become smaller than the inner diameter of the negative electrode can, is 2-7%, or in particular 3-5%. Expansion of the negative electrode in its diameter direction during alloying time has a close relation with the amount of lithium in an alloy of lithium-aluminum at the negative electrode, that is, the less the amount of lithium becomes, the less the expansion in the diameter direction during the alloying time becomes, and vice versa. |