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1. (WO2010116590) CYLINDRICAL BATTERY

Pub. No.:    WO/2010/116590    International Application No.:    PCT/JP2010/001117
Publication Date: Fri Oct 15 01:59:59 CEST 2010 International Filing Date: Tue Feb 23 00:59:59 CET 2010
IPC: H01M 2/12
H01M 2/04
H01M 10/0525
Applicants: Panasonic Corporation
パナソニック株式会社
YOKOYAMA, Tomohiko
横山智彦
Inventors: YOKOYAMA, Tomohiko
横山智彦
Title: CYLINDRICAL BATTERY
Abstract:
The opening of a battery case (1) formed in a cylindrical shape and having a bottom is sealed with an opening sealing assembly (5). The opening sealing assembly (5) is provided with an upper valve plate (13), a lower valve plate (15), and a bottom plate (16). An internal-gas vent hole (21) is formed in the bottom plate (16). In an axial view of the battery case (1), at least a part of the internal-gas vent hole (21) is overlapped with a valve hole forming section (15b) of the lower valve plate (15). The configuration prevents a valve hole from being closed even if, for example, an electrode group (20) rises due to an increase in the pressure in the battery to thereby push up the bottom plate (16).