| 摘要 |
A lithium secondary battery includes: a battery case, and an internal electrode body (1) contained in the battery case and including a positive electrode (2), a negative electrode (3), and a separator (4) made of porous polymer. The battery case is composed of pure aluminum or aluminum alloy in which one or more components selected from manganese, magnesium, silicon and copper is added to the aluminum. The lithium secondary battery has high energy density, is superior in safety, and is used for, particularly, an electric vehicle. Preferably the battery has a capacity of 50 Wh or more, and the following relationships are established: 0.004<=t/d<=0.04, where the battery case is cylindrical, its outer diameter is d (mm), and its wall thickness is t (mm); and C/(w.c)<=0.03, where current capacity is C (Ah), battery weight is w (kg), and specific heat of the battery is c(W/kg° C.).
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