To provide a nonaqueous secondary battery having: a configuration prepared in one with a larger expansion and contraction degree upon charging and discharging out of a positive electrode plate and a negative electrode plate, for performing function which suppresses the expansion and construction of the one with the larger expansion and contraction degree; with high safety by alleviating stress caused by expansion and contraction of the electrode plates upon charging and discharging the nonaqueous secondary battery, and by preventing breakage or buckling of the electrode plates upon charging and discharging.
An electrode group 10 configured with a cathode plate 4 with a positive electrode mixture coating material coated on a positive electrode collector 1 and with positive electrode mixture layers 2a, 2b formed, a negative electrode plate 8 with a negative electrode mixture coating material coated on a negative electrode collector 5 and with negative electrode mixture layers 6a, 6b formed on the negative electrode collector 5, with a separator 9 intervened between them and spirally wound, further has a configuration with the expansion and contraction suppressing function for suppressing expansion and contraction in either of the positive electrode plate 4 or the negative electrode plate 8 with the larger expansion and contraction degree upon charging and discharging.
NISHIOKA TSUTOMU
SUMIHARA MASANORI
Daisuke Nagano
Kentaro Fujii
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