To provide a nonaqueous secondary battery with high safety, the safety being achieved by having a structure provided with porous insulation bodies with a function to alleviate a difference of expansion and contraction rates upon charging and discharging between a positive electrode plate and a negative electrode plate in the nonaqueous secondary battery, thereby alleviating stress by expansion and contraction of the electrode plates upon charging and discharging of the nonaqueous secondary battery, and restraining break or buckling of the electrode plates upon charging and discharging.
An electrode group 8 is structured by winding the positive electrode plate 3 and the negative electrode plate 6 in a spiral shape with the porous insulation bodies 7a, 7b interposed therebetween constituting a multilayer structure, the insulation bodies 7a, 7b having different expansion rates and porosities or the like. The positive electrode plate 3 has a positive electrode mixture layer 2 made by applying a positive electrode mixture paint on a positive electrode collector 1 and the negative electrode plate 6 has a negative electrode mixture layer 5 made by applying a negative electrode mixture paint on a negative electrode collector 4.
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YAMADA MASAKAZU
Hiroki Naito
Daisuke Nagano