To prevent decrease in battery characteristics caused by leakage of gas or an electrolyte from a sealed part of a sealing material and a can by suppressing the deformation of the sealing material even if inner pressure of the battery is substantially increased by gas generated in the inside of the battery in a sealed secondary battery formed by housing an electrode body in which a separator is interposed between a positive electrode and a negative electrode in a battery container composed of the can and the sealing body for sealing the opening part of the can.
The sealed secondary battery is constituted by housing the electrode body 10 in which the separator 3 is interposed between the positive electrode and the negative electrode and an electrolyte in the battery container comprising the can 20 and the sealing body 30 for sealing the opening part of the can 20, and a plurality of reinforcing projection parts 30c are radially installed in the sealing body 30.
COPYRIGHT: (C)2005,JPO&NCIPI
Hiroyuki Akita
Takaaki Ikemachi
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