Title:
A separator for liquid type lead storage batteries, and a liquid type lead storage battery
Document Type and Number:
Japanese Patent JP6030194
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a separator for liquid-type lead storage batteries, which allows a dendrite short circuit to be prevented as far as possible even when used in an environment that can easily bring a battery into the state of being overdischarged, in which the separator is composed of a ribbed microporous film having an average pore diameter of about 0.02-0.2 μm, a maximum pore diameter of about 0.3-0.8 μm, and a porosity of about 55-75%, which has been regarded as being less prone to causing a dendrite short circuit in a liquid-type lead storage battery conventionally.SOLUTION: A separator for liquid-type lead storage batteries is composed of a ribbed microporous film arranged by: melting and kneading a raw material composition chiefly including a polyolefin-based resin, inorganic powder and a plasticizer; integrally molding into a film-like form having a tabular sheet and main ribs provided on one side of the tabular sheet so as to protrude for abutting against an electrode plate; and then, removing part of the plasticizer. The ribbed microporous film has mini-ribs for abutting against an electrode plate provided on a face of the tabular sheet on the side opposite to the one side of the tabular sheet where the main ribs are provided. The mini-ribs each have a height less than 0.3 times that of the main rib in height, and a bottom rib width less than 0.3 times that of the main rib.
More Like This:
Inventors:
Tatsushi Takashi
Shuhei Nagakubo
Takaaki Matsunami
Tadamasa Wada
Shuhei Nagakubo
Takaaki Matsunami
Tadamasa Wada
Application Number:
JP2015147341A
Publication Date:
November 24, 2016
Filing Date:
July 27, 2015
Export Citation:
Assignee:
NIPPON SHEET GLASS COMPANY,LIMITED
International Classes:
H01M2/18; H01M2/16
Domestic Patent References:
| JP2168557A | ||||
| JP2005528762A | ||||
| JP2001093500A | ||||
| JP2003109573A |
Foreign References:
| WO2012040409A1 | ||||
| US20020004166 |
Attorney, Agent or Firm:
Yoshihiro Shimizu
Shinichi Abe
Yuji Tsujida
Yuko Komatsu
Mizuki Saayako
Shinichi Abe
Yuji Tsujida
Yuko Komatsu
Mizuki Saayako