Lithium secondary battery

A lithium secondary battery comprising:

• a battery can having a bottom, a side wall, and an open top;
• an electrode assembly;
• a non-aqueous electrolyte;
• and a sealing plate covering the open top of said battery can that accommodates said electrode assembly and said electrolyte,
• wherein said electrode assembly comprises a strip-like positive electrode and a strip-like negative electrode that are wound together with a porous heat-resistant layer interposed between the positive and negative electrodes, said positive electrode comprising a positive electrode core member and a positive electrode active material layer carried on the positive electrode core member, said negative electrode comprising a negative electrode core member and a negative electrode active material layer carried on the negative electrode core member, and
• said battery has a restricting part for restricting vertical movement of said electrode assembly, a distance A from said restricting part to an inner face of the bottom of said battery can and a width B of said negative electrode satisfying the relation:
• 0.965≦B/A≦0.995.