Patent ID: 8043739
Filing Date: 2011-10-25
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 and having 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 with a purity of 99 wt. % or more, or an aluminum alloy with 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, and including a terminal body made of at least one metal selected from the group consisting of copper, iron and nickel, and a layer formed on the surface of the terminal body to which the second end of the negative electrode lead is connected, the layer being made of 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.