초록 ▼

A battery separator fabric comprising a nonwoven fibrous web of thermoplastic fibers having top and bottom surface fibers and inner fibers. The surfaces of the top and bottom surface fibers of the fibrous web are seared and fused together to form film-like surfaces having pores, while the surface fi

A battery separator fabric comprising a nonwoven fibrous web of thermoplastic fibers having top and bottom surface fibers and inner fibers. The surfaces of the top and bottom surface fibers of the fibrous web are seared and fused together to form film-like surfaces having pores, while the surface fibers and inner fibers of the web remain substantially unaffected. Searing and fusing of the surface fibers are accomplished by simultaneously applying heat to the top and bottom surfaces of the fibrous web so as to sear the surfaces of the thermoplastic fibers, and pressure to insure that the seared fibers make contact with each other to secure themselves together. As the seared fibers make contact with each other, film-like surfaces are formed with pores being created in the surfaces. The pores are created because a majority of spaces remain between the surface fibers. In addition, the heat and pressure are controlled by varying the temperature and pressure so that the surface fibers and the inner fibers of the fibrous web are substantially unaffected. The unaffected top and bottom and inner fibers along the porous film-like surfaces, permit the fibrous web to substantially retain its original porosity. This results in a film-like fabric having excellent porosity, which is well-suited as a battery separator.

대표청구항 ▼

A battery separator fabric for use in a battery comprising: a nonwoven fibrous web of polyolefin fibers, having top and bottom surface fibers and inner fibers, the surfaces of said top and bottom surface fibers being seared by heat and pressure causing only the surfaces of said top and bottom surfac

A battery separator fabric for use in a battery comprising: a nonwoven fibrous web of polyolefin fibers, having top and bottom surface fibers and inner fibers, the surfaces of said top and bottom surface fibers being seared by heat and pressure causing only the surfaces of said top and bottom surface fibers to spread out contacting other surface fibers so as to form top and bottom film-like surfaces on said web, the original state of said fibers being otherwise substantially unaffected by said heat or pressure; said film-like surfaces having a plurality of pores disposed therein, said plurality of pores permitting ionic migration to occur in the battery by allowing electrolytes to pass through said pores; said nonwoven fibrous web having a thickness prior to being seared of approximately 1-20 mils, such that the separator fabric has a thickness of approximately 2-3 mils, and percent void volume in the range of 28-45.