T. Higashi et H. Endoh, ENDURANCE OF BATTERIES AND SEPARATORS IN AUTOMOTIVE APPLICATIONS UNDER HIGH-TEMPERATURE CONDITIONS, Journal of power sources, 73(1), 1998, pp. 110-121
Endurance tests under high-temperature conditions have been performed
on three groups of automotive batteries. One group has been assembled
with polyethylene pocket separators fur thr negative plates, another w
ith polyethylene pocket separators with glass mats for the positive pl
ates. and a third with leaf-type synthetic pulp separators with glass
mats. Negative plates developed a sand-like appearance in the batterie
s assembled with the polyethylene pocket separators for the negative p
lates. Evidence of piercing shorts is found in batteries assembled wit
h polyethylene pocket separators with glass mars for the positive plat
es. Also presented are the results of a structural analysis of failure
s in polyethylene separators after a series of cycle-life tests under
high-temperature conditions, together with a theoretical examination o
f the deterioration process of the polyethylene pocket separators. It
is concluded that battery assembly with polyethylene pocket separators
with glass mat is an effective way to achieving good endurance (i.e.
life extension at high temperature). On the other hand, the selection
of leaf-type synthetic pulp separators with glass mars is the best app
roach for hot climatic conditions. (C) 1998 Published by Elsevier Scie
nce S.A. All rights reserved.