Nonaqueous electrolyte secondary battery and battery module

摘要

A nonaqueous electrolyte secondary battery, having an internal resistance of 10 mΩ or less as an alternating-current impedance value of 1 kHz, comprises 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, a separator interposed between the negative electrode and the positive electrode, a negative electrode lead having one end connected to the negative electrode, and a negative electrode terminal attached to the outer container so as to be connected electrically to the other end of the negative electrode lead, at least the surface of the negative electrode terminal which is connected to the negative electrode lead being formed of aluminum alloy with an aluminum purity of less than 99 wt. % containing at least one metal selected from the group consisting of Mg, Cr, Mn, Cu, Si, Fe and Ni.

主权项

1. A nonaqueous electrolyte secondary battery having an internal resistance of 10 mΩ or less at an alternating-current impedance value of 1 kHz, comprising:
an outer container; a nonaqueous electrolyte housed in the container; a positive electrode housed in the container; a negative electrode housed in the container and 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 with a purity of 99 wt. % or more, or an aluminum alloy with an aluminum purity of 99 wt. % or more; a negative electrode terminal extending from the inside of the outer container to the outside 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; a positive electrode lead having a first end connected to the positive electrode; and a positive electrode terminal extending from the inside of the outer container to the outside in a same direction as a direction from which the negative electrode terminal extends, so as to be connected electrically to a second end of the positive electrode lead.