| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a battery pack hardly causing deterioration of battery performance due to overdischarge even without using a protective circuit. <P>SOLUTION: The battery pack, in which a plurality of single cells are connected, is constituted from sodium ion secondary cells in each of which the single cell includes: a cathode containing cathode active material capable of undergoing doping and de-doping of sodium ions; an anode; and electrolyte. <P>COPYRIGHT: (C)2012,JPO&INPIT |
