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1. (WO2018077407) A DOUBLE-CHAMBER BATTERY VENTING SYSTEM

Pub. No.:    WO/2018/077407    International Application No.:    PCT/EP2016/075870
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Thu Oct 27 01:59:59 CEST 2016
IPC: H01M 2/12
Applicants: ABERTAX RESEARCH & DEVELOPMENT LTD.
Inventors: MERZ, Klaus-Dieter
CILIA, Joseph
FARRUGIA, Aaron
TABONE, Malcolm
SCHEMBRI, George
Title: A DOUBLE-CHAMBER BATTERY VENTING SYSTEM
Abstract:
A battery venting system for batteries such as VLRA (valve regulated lead acid batteries) is provided that comprises at least one check valve (16) for each cell (12) of the battery (10), a first chamber (21, 13) enclosing a first volume (14), a calibrated one-way valve (24), and a second chamber (23, 21') enclosing a second volume (50), the second volume (50) being separated from the first volume (14) by a separating wall (21') common to the first and second chambers. Each check valve (16) is provided between its respective battery cell (12) and the first volume (14) to enable a fluid communication between the respective cell and the first volume when open and to seal the respective battery cell (12) when closed. The calibrated one-way valve (24) is positioned in the separating wall (21') for providing a fluid communication between the first volume (14) and the second volume (50) when open, and for sealing the first volume (14) from the second volume (50) when closed. The first chamber (21, 13, 40, 42) is continuously bonded to the case (11) of the battery (10) such that the first volume is hermetically sealed, when the check valves (16) and the calibrated one-way valve (24) are closed. The second chamber (23, 21') has an outlet opening (27) providing the only fluid communication from the second volume (50) to the surrounding of the battery venting system (20) and the battery (10), with the second chamber being continuously bonded to the first chamber for providing, with the exception of the outlet opening (27), a hermetically sealed encasing for the second volume and from the complete battery. The battery venting system (20) is configured such that when the second chamber (23, 21') is in normal use located above the first chamber (21, 13), the inlet port of the calibrated one-way valve (24) is located above the bottom of the first chamber (21, 13), and when the second chamber (23, 21') is in normal use located below the separating wall (21'), the inlet port of the calibrated one-way valve (24) is located above the surface of the separating wall (21') facing to the first volume (14).