Microporous membranes, battery separators, lithium batteries, vehicles, and related methods

• Main Authors: POLLEY JEFFREY GORDON, XIAO KANG KAREN, ALEXANDER DANIEL R, ROBERTSON DOUGLAS GEORGE, SUMMEY, BARRY, J, WILLIAMS SHANTE P, VOSS ANDREW EDWARD, ZHANG XIAOMIN, MASON WILLIAM JOHN, STEPP BRIAN R, STOKES KRISTOFFER K, ADAMS CHANGQING WANG, MORRION, ROBERT
• Format: Patent
• Language: Chinese; English
• Published: 08.07.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The battery separator is used for a lithium battery and comprises a microporous membrane which is rolled and stretched by a dry method; or comprising a dry-stretched microporous membrane having a population of micropores different from round pores, for example, the population of pores being slit-shaped, trapezoidal or rectangular. The holes are openings or gaps between adjacent sheet layers, and one side or two sides of each hole are adjacent through filaments or bridging structures between adjacent sheet layers. The present invention can reduce the porosity and/or improve the lateral tensile strength of the multilayer microporous membrane in a controlled manner. The multilayer microporous membrane provided by the invention is easy to coat with a polymer ceramic coating. The thickness ratio of the polypropylene layer to the polyethylene layer in the multilayer microporous membrane can be customized to balance the mechanical strength and the thermal shutdown performance. 一种电池隔板，用于锂电池，其包含既经压延又经干法拉伸的微孔膜；或者其包含经干法