Use of a copolyester film in the manufacture of a lithium-ion wet cell battery comprising an anode, a cathode and an electrolyte, wherein the copolyester film comprises a copolyester which comprises repeating units derived from a diol, a dicarboxylic acid and a poly(alkylene oxide)glycol.

Use of a copolyester film in the manufacture of a lithium-ion wet cell battery comprising an anode, a cathode and an electrolyte, wherein the copolyester film comprises a copolyester which comprises repeating units derived from a diol, a dicarboxylic acid and a poly(alkylene oxide)glycol.

A separator for a rechargeable battery includes a porous substrate and a heat resistance layer on at least one surface of the porous substrate. The heat resistance layer includes an acryl-based copolymer, an alkali metal, and a filler. The acryl-based copolymer includes a unit derived from (meth)acrylate or (meth)acrylic acid, a cyano group-containing unit, and a sulfonate group-containing unit.

A separator for an electricity storage device comprising a silane-modified polyolefin, wherein silane crosslinking reaction of the silane-modified polyolefin is initiated when it contacts with the electrolyte solution, as well as a method for producing the separator.

A battery separator has performance enhancing additives or coatings, fillers with increased friability, increased ionic diffusion, decreased tortuosity, increased wettability, reduced oil content, reduced thickness, decreased electrical resistance, and/or increased porosity. The separator in a battery reduces the water loss, lowers acid stratification, lowers the voltage drop, and/or increases the CCA. The separators include or exhibit performance enhancing additives or coatings, increased porosity, increased void volume, amorphous silica, higher oil absorption silica, higher silanol group silica, reduced electrical resistance, a shish-kebab structure or morphology, a polyolefin microporous membrane containing particle-like filler in an amount of 40% or more by weight of the membrane and ultrahigh molecular weight polyethylene having shish-kebab formations and the average repetition periodicity of the kebab formation from 1 nm to 150 nm, decreased sheet thickness, decreased tortuosity, separators especially well-suited for enhanced flooded batteries.

A cutting device includes a drum section that rotates to convey a continuous body, and a cutting section that cuts the continuous body into multiple individual works. The drum section includes multiple holding heads that move while holding the respective works. The cutting section includes a cutter unit that moves together with multiple holding heads and that is smaller in number than the holding heads, and a cutter drive unit that moves the cutter unit independently of multiple holding heads. The cutter unit moves alongside of the continuous body from a certain cutting start position to cut the continuous body. The cutter drive unit returns the cutter unit that has cut the continuous body, to the cutting start position.

A cutting device includes a drum section that rotates to convey a continuous body, and a cutting section that cuts the continuous body into multiple individual works. The drum section includes multiple holding heads that move while holding the respective works. The cutting section includes a cutter unit that moves together with multiple holding heads and that is smaller in number than the holding heads, and a cutter drive unit that moves the cutter unit independently of multiple holding heads. The cutter unit moves alongside of the continuous body from a certain cutting start position to cut the continuous body. The cutter drive unit returns the cutter unit that has cut the continuous body, to the cutting start position.

A separator for spatially separating and electrically isolating electrodes in a battery cell. The separator has a receptacle for at least one galvanic cell which includes an anode and a cathode; a structure composed of conductive material for electrically connecting the anode and cathode to one another and for making contact with the at least one galvanic cell from outside; and a duct system for forming a cooling fluid flow in the separator. At least the receptacle and the duct system are integrally formed in the separator.

A separator for spatially separating and electrically isolating electrodes in a battery cell. The separator has a receptacle for at least one galvanic cell which includes an anode and a cathode; a structure composed of conductive material for electrically connecting the anode and cathode to one another and for making contact with the at least one galvanic cell from outside; and a duct system for forming a cooling fluid flow in the separator. At least the receptacle and the duct system are integrally formed in the separator.

Described herein is a multilayer microporous film or membrane that may exhibit improved properties, including improved dielectric break down and strength, compared to prior monolayer or tri-layer microporous membranes of the same thickness. The preferred multilayer microporous membrane comprises microlayers and one or more lamination barriers. Also disclosed is a battery separator or battery comprising one or more of the multilayer microporous films or membranes. The inventive battery and battery separator is preferably safer and more robust than batteries and battery separators using prior monolayer and tri-layer microporous membranes. Also, described herein is a method for making the multilayer microporous separators, membranes or films described herein.