NOVELTY - A composite porous separation membrane comprises a porous substrate as a supporter and has melting point (a) and porosity (b), a primary porous polymer web layer which is laminated on one side surface of the porous substrate and acts as an adhesive layer when put in close contact with an electrode in opposite orientation, and a secondary porous polymer web layer consisting of heat-resistant polymer nanofibers which are laminated on the other side surface of the porous substrate.    USE - Composite porous separation membrane is used for lithium secondary battery (claimed) and super capacitor for hybrid electric vehicle, electric vehicle and fuel cell vehicle.    ADVANTAGE - The composite porous separation membrane has high shut down function. The battery using the membrane has high thermal stability and cycle characteristics.    DETAILED DESCRIPTION - A composite porous separation membrane (10) comprises a porous substrate as a supporter and has melting point (a) and porosity (b), a primary porous polymer web layer (13) which is laminated on one side surface of the porous substrate (11) and acts as an adhesive layer when put in close contact with an electrode in opposite orientation, and a secondary porous polymer web layer (14) consisting of heat-resistant polymer nanofibers which are laminated on the other side surface of the porous substrate. The primary porous polymer web layer and the secondary porous polymer web layer have melting points higher than the melting point (a) of the porous substrate, and porosity which is same with respect to porosity (b). INDEPENDENT CLAIMS are included for the following:    (1) manufacture of composite porous separation membrane; and    (2) secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic cross-sectional view of composite porous separation membrane.    Composite porous separation membrane (10)    Porous substrate (11)    Primary porous polymer web layer and secondary porous polymer web layers (13,14)