Patent ID: 7892674
Filing Date: 2011-02-22
Classification: H01M,Y02E,Y02P

Abstract:
1. A nonaqueous electrolyte secondary battery having an internal resistance of 10 mΩ or less as an alternating-current impedance value of 1 kHz, comprising: a metal outer container; a nonaqueous electrolyte contained in the container; a positive electrode contained in the container; a negative electrode contained in the container, the negative electrode comprising an active material for intercalating lithium ions at a potential of 0.4 V or more with respect to an electrode potential of lithium; a separator interposed between the negative electrode and the positive electrode; a negative electrode lead having a first end connected to the negative electrode, the negative electrode lead being made of aluminum having a purity of 99 wt. % or more or an aluminum alloy having an aluminum purity of 99 wt. % or more; and a negative electrode terminal attached to the outer container so as to be connected electrically to a second end of the negative electrode lead, the negative electrode terminal being made of an aluminum alloy which has an aluminum purity of 90 wt. % or more and less than 99 wt. % and which comprises 0.5 to 5 wt. % of Mg.