Connected porous sheet and method for producing the same, separator for non-aqueous secondary battery, and non-aqueous secondary battery, and method for producing the same

摘要

An example of the present invention is provided with porous sheets 11, 21 each formed by layering a porous base material including a polyolefin and a heat-resistant porous layer including a heat-resistant resin. The porous sheets 11, 21, respectively, are connected at connecting regions 15a and 15b, 25a and 25b, respectively, which have been formed by thermal fusion of the heat-resistant porous layers facing each other by folding the sheets. Furthermore, the porous sheets 11, 21 are additionally connected at a connecting region 27 that has been formed by thermal fusion.

主权项

1. A connected porous sheet comprising one or a plurality of porous sheets, each having: a porous base material including a polyolefin; and a heat-resistant porous layer provided on one surface or both surfaces of the porous base material and including a heat-resistant resin,
the connected porous sheet having at least one of a connecting region at which a part of the heat-resistant porous layer of the porous sheet has been connected to another part of the porous sheet by thermal fusion, or a connecting region at which a part of a heat-resistant porous layer of a first porous sheet selected from the plurality of porous sheets has been connected to a part of a second porous sheet different from the first porous sheet by thermal fusion, wherein when a porosity (%) and a thickness (μm) of the heat-resistant porous layer are εa and ta, respectively, and a porosity and a thickness (μm) of the porous base material are εb (%) and tb, respectively, the connected porous sheet satisfies the following formula (1):
(εa/100)×ta≦[1−(εb/100)]×tb  Formula (1).