Separator for lead-acid batteries, and lead-acid battery

The invention provides a method for preventing the penetration of dendrites through the whole area of a microporous film, mainly through a base portion that makes up the major portion of the whole (whole area) of a separator, in a simpler and more efficient manner. A separator for lead-acid batterie...

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Hauptverfasser: SHIDOMI TAKASHI, WADA TADAMASA
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The invention provides a method for preventing the penetration of dendrites through the whole area of a microporous film, mainly through a base portion that makes up the major portion of the whole (whole area) of a separator, in a simpler and more efficient manner. A separator for lead-acid batteries, which comprises a microporous film that is produced by melt-kneading a raw material composition mainly composed of a polyolefin resin, a silica powder and a plasticizer, then forming a film from the melt-kneaded product and then removing a portion or the whole of the plasticizer from the film, wherein the raw material composition contains glass flakes, which has an average particle diameter of 20 to 800 [mu]m and an average thickness of 0.2 to 8 m and do not have self-film-forming ability, in an amount of 2 to 15% by weight relative to the total amount of the glass flakes and the silica powder, the direction of the surface of each of the glass flakes in the microporous film is approximately oriented to the direc