NOVELTY - The battery has a negative electrode including a current collector and a negative electrode layer. The electrode is provided with a porous structure, where pore diameter distribution of the electrode as determined by mercury porosimetry with peak having mode diameter falling within range of 0.01 to 0.2 micrometer and another peak having mode diameter falling within range of 0.003 to 0.02 micrometer and volume of pores includes diameter of 0.003 to 0.02 micro meter as determined by the mercury porosimetry is 0.0001 to 0.02 milliliter per gram of the electrode excluding weight of the collector.    USE - Flat type nonaqueous electrolyte battery for use in a battery pack of a digital camera and a vehicle (all claimed) e.g. hybrid automobile and power-assisted bicycle.    ADVANTAGE - The battery improves impregnation capability of the negative electrode with nonaqueous electrolyte, thus improving productivity and large current characteristics of the battery. The battery allows ionic liquid to be oxidized easily, so that the ionic liquid acts on the positive electrode to produce effect of suppressing self-discharge in a case of using the ionic liquid, thus improving charge-discharge cycle life of the battery. The battery allows average crystal grain size of the aluminum foil or aluminum alloy foil forming the positive electrode current collector to be not larger than 50 micrometer, so that mechanical strength of the aluminum foil or aluminum alloy foil can be drastically increased to press the positive electrode with high pressure and density of the positive electrode can be increased, thus increasing the battery capacity.    DETAILED DESCRIPTION - The battery has nonaqueous electrolyte containing solvents selected from a group consisting of propylene carbonate, ethylene carbonate and a-butyrolactone. The metal composite oxide is selected from a group consisting of titanium-based oxide-Phosphorus pentoxide, titanium-based oxide-Phosphorus pentoxide-Tin oxide and titanium-based oxide-Phosphorus pentoxide. The negative electrode layer contains titanium-based oxide selected from a group consisting of Titanium oxide and metal composite oxide containing element selected from a group consisting of Phosphorus, Vanadium, Tin, Copper, Nickel, Cobalt and Iron.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a structure illustrating construction of a flat type nonaqueous electrolyte battery.    Band-like positive electrode terminal (1)    Band-like negative electrode terminal (2)    Wound electrode group (6)    Case (7)