Battery having a separator with a microporous film

Details Battery having a separator with a microporous film Battery having a separator with a microporous film

H - Electricity

01

M

H01M 2/16 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2426178

A cell having an excellent discharge load characteristic and an excellent low- temperature discharge characteristic. The cell has a coiled electrode element in which band-shaped positive and negative electrodes and a separator (23) impregnated with an electrolyte and interposed between them are coiled. The separator (23) includes a porous film (23a) such that the mean pore diameter is 0.15 ~m or less, and the mean ratio of the largest diameter (DL) of the pores to the shortest diameter (DS) ranges from 0.4 to 1Ø As a result the pores (23b) are prevented from being plugged. The electrolyte permeability, ionic permeability, and electrolyte retainability of the separator (23) are improved. Consequently, the cell can have excellent discharge load characteristic and low-temperature discharge characteristic.

L'invention concerne une pile présentant d'excellentes caractéristiques de décharge, notamment, à basse température. Cette pile comprend un fil-électrode dans lequel les électrodes positive et négative en bande, ainsi que le séparateur (23) imprégné d'électrolyte qui les isole, sont enroulés. Le séparateur (23) contient un film poreux (23a) dans lequel le diamètre moyen de pores est de 0,15 µm ou moins, et le rapport moyen entre le diamètre le plus grand (D¿L?) des pores et le diamètre le plus petit (D¿S?) se situe entre 0,4 et 1,0, ce qui empêche le colmatage des pores. Par ailleurs, la perméabilité à l'électrolyte, la perméabilité aux ions et le pouvoir de rétention électrolytique du séparateur (23) sont améliorés. Par conséquent, la cellule peut présenter d'excellentes caractéristiques de décharge, notamment à basse température.

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