Gas evolution and thermal behaviour of valve regulated lead acid batteries under abnormal operational conditions

Abstract

Heat generation in a lead acid battery during energy conversion was studied. The temperature effects which are to be expected were evaluated using the fundamental laws of heat dissipation, and a computer program was established to predict the heat balance of a battery. The results are compared with overcharge experiments carried out with valve regulated block-batteries of the type Vsb 6905 T (6 Volt; K/sub 10/=85 Ah, Microglas absorbent version) including gas measurements and gas analysis. It is suggested that valve regulated lead acid batteries, especially when designed for short bridging periods, should be equipped with a monitoring system to avoid critical situations in case the voltage controlling system fails. The temperature of the battery is one of the parameters suited for this kind of monitoring.<>