Patent ID: 7951482
Filing Date: 2011-05-31
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
1. A non-aqueous electrolyte secondary battery comprising an electrode assembly, a non-aqueous electrolyte, and a substantially rectangular battery case for housing said electrode assembly and said non-aqueous electrolyte, said battery case having a thickness α, a width β, and a height γ satisfying a relation α<β≦γ: wherein said electrode assembly includes a positive electrode, a negative electrode, and a porous heat-resistant layer disposed between said positive electrode and said negative electrode; said positive electrode includes a positive electrode active material layer and said negative electrode includes a negative electrode active material layer; a ratio of a pore volume in a predetermined area of said porous heat-resistant layer to a theoretical capacity of said battery is 0.18 to 1.117 ml/Ah, said predetermined area having a same area as said positive electrode active material layer; and a porosity of said porous heat-resistant layer is 35 to 85%, said porous heat-resistant layer includes a nonconductive filler and a binder, said nonconductive filler has a median size of 0.3 to 4 μm, and an amount of said binder is 0.3 to 8.5 parts by weight per 100 parts by weight of said nonconductive filler.