| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve safety of a battery during external short circuit and during overcharge. <P>SOLUTION: A secondary battery includes: an electrode laminate 6 having a positive electrode and a negative electrode which are laminated via a separator; an outer package 7 in which the electrode laminate 6 is housed; a negative electrode tab of which one end is electrically connected to the negative electrode and the other end is extended to the outside of the outer package 7; a current cut-off part 10 having a current cut-off element 11 which is disposed on an electric path between the negative electrode and the negative electrode tab. The current cut-off element 11 includes a pair of breaking parts 16 which are broken when the outer package 7 coupled to the inner surface opposite to the outer package 7 is expanded, and a fusible part 17 which is formed over the pair of the breaking parts 16 and fuses when an excess current flows. One of the pair of the breaking parts 16 is electrically connected to the negative electrode tab, and the other of the pair of the breaking parts 16 is electrically connected to the negative electrode. <P>COPYRIGHT: (C)2013,JPO&INPIT |
