IMPROVED MEMBRANES, CALANDRATED MICROPOROUS MEMBRANES, BATTERY SEPARATORS AND APPROPRIATE METHODS Russian patent published in 2022 - IPC H01M10/562 H01M10/52 

FIELD: batteries.

SUBSTANCE: inventions group relates to improved microporous single- or multi-layer battery separator membranes, separators, batteries including such membranes or separators, methods for manufacturing such membranes, separators and/or batteries, and/or methods for using such membranes, separators and/or batteries. A method for manufacturing a multilayer polyethylene/polypropylene/polyethylene microporous separator includes stretching in the longitudinal direction followed by stretching in the transverse direction and the subsequent stage of calendering as a means of reducing the thickness of the multilayer microporous membrane to reduce the relative porosity of the multilayer microporous membrane in a controlled increase, and/or for tensile strength in the transverse direction. The result is a thin multi-layer microporous membrane which is easily applied with polymer-ceramic coatings, which has excellent mechanical strength characteristics due to its inner polypropylene layer or layers and thermal shutdown function due to its polyethylene layer or layers.

EFFECT: improving the design and technical characteristics of the battery.

24 cl, 37 dwg, 4 tbl