| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem, wherein breaking or buckling of a positive electrode plate that causes internal short circuiting of a battery is generated due to the difference in the degree of expansion and contraction, between the positive electrode plate and a negative electrode plate, by repeated charge and discharge, due to the stress caused by expansion and contraction of the electrode plate applied to the electrode plate, when a nonaqueous secondary battery is repeatedly charged-discharged. <P>SOLUTION: A positive electrode plate 4 for a nonaqueous secondary battery having high reliability is manufactured by increasing the degree of expansion and contraction of the positive electrode plate 4 through a first step, in which positive mix coating is applied to a positive current collector, dried, and then they are pressed into a prescribed thickness; and then a second step in which the pressed current collector is heated to a temperature or higher, at which crystal grains of the positive current collector grow with heating rolls 1, 2, 3, releasing stress applied to the positive electrode plate 4 in which the degree of expansion and contraction is low, caused by the difference of the degree of expansion and contraction between the positive electrode plate 4 and the negative electrode plate in the expansion and contraction of the electrode plate in charging/discharging, and suppressing the generation of breaking or buckling of the positive electrode plate 4. <P>COPYRIGHT: (C)2011,JPO&INPIT |
