The first test performed was a high rate discharge test on
train monoblocs assembled with Amersil corrugated SK120 separator compared to standard ribbed competitor. The test
consisted in discharging the monoblocs at a rate of 1100 A
for 10 s, the terminal voltage of each cell being measured
before and during each discharge. After a rest period of
5 min, the monoblocs were discharged again. This sequence
was repeated until the end voltage reached 1.60 V. The
results are presented on Fig. 9.
The impact of the separator on the high rate discharge
performance of the present type of battery is well pronounced.
The data show that the Amersil SK120 separator
allowed three times as many discharges than the standard
competition separator before reaching the cut-off voltage of
1.6 V (36 discharges compared to 12). The efficiency of the
corrugated separator led also to 5% higher terminal voltage
compared to competition. To explain these results, one has to
keep in mind that high rate discharge tests are the most
sensitive to electrical resistance. As the Amersil corrugated
material has the lowest possible electrical resistance for a
given backweb thickness (only 75 mOcm2
), this results in a
higher voltage profile under a high discharge load. Additionally,
besides the low electrical resistance due to its high
porosity and absence of rib, the SK separator has very low
acid displacement. The extra electrolyte volume available
compared to lower porosity, standard ribbed material, helps
the cell perform well under load and better recover from
discharge.
The first test performed was a high rate discharge test ontrain monoblocs assembled with Amersil corrugated SK120 separator compared to standard ribbed competitor. The testconsisted in discharging the monoblocs at a rate of 1100 Afor 10 s, the terminal voltage of each cell being measuredbefore and during each discharge. After a rest period of5 min, the monoblocs were discharged again. This sequencewas repeated until the end voltage reached 1.60 V. Theresults are presented on Fig. 9.The impact of the separator on the high rate dischargeperformance of the present type of battery is well pronounced.The data show that the Amersil SK120 separatorallowed three times as many discharges than the standardcompetition separator before reaching the cut-off voltage of1.6 V (36 discharges compared to 12). The efficiency of thecorrugated separator led also to 5% higher terminal voltagecompared to competition. To explain these results, one has tokeep in mind that high rate discharge tests are the mostsensitive to electrical resistance. As the Amersil corrugatedmaterial has the lowest possible electrical resistance for agiven backweb thickness (only 75 mOcm2), this results in ahigher voltage profile under a high discharge load. Additionally,besides the low electrical resistance due to its highporosity and absence of rib, the SK separator has very lowacid displacement. The extra electrolyte volume availablecompared to lower porosity, standard ribbed material, helpsthe cell perform well under load and better recover fromdischarge.
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