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ENERGIZERBATTERYMANUFACTURING
VERSION1.2
3.4‐‐Multi‐BatteryApplications
In some situations, a higher voltage or an increased performance level is desired for a certain
application.ZincAirbatteries canbearrangedinseriesorinparallelasneeded.Devicesthatusemore
thanoneZincAir Prismaticbattery introduceadditional designconsiderations. An airplenumandair
access
is required for each battery, and these can be independent or shared.Additionally, stacked
batteriesrequirespaceabovetheairholesideofeachbattery.Iftwobatteriesarestackedwiththeair
holesidesfacingeachother,thenasingleairplenumcanbeused.
3.5‐‐RecommendedCutoffVoltage
TherecommendedendoflifeforZincAirbatteriesisat0.9voltswhereessentiallyallavailablecapacity
hasbeenused.Below0.9voltsadditionalchemicalreactionsmaytakeplaceinthebatterywhichcan
leadtoincreasedpotentialforgassingandleakage.Energizerrecommendsthatdevicesaredesignedto
prevent
thebatteryfrombeingdischarged below0.9volts.Thiscanbe accomplishedpreferablybya
completedisconnectofthebatterycircuitorbyusingalowvoltagebatterywarning.
3.6‐‐FuelGauging
ZincAirPrismaticbatterieshavea relativelyflatdischargecurvecomparedtoexistingAlkalinesolutions,
withthedischarge curve slopingmoreatincreaseddischarge rates.Thiscanbeseen inFigure4 and
Figure6.AlthoughtherelativelyflatdischargecurvemakestheZincAirsystemmorechall engingto
fuel
gauge with conventional voltage‐only measurements, the flat voltage profile helps make device
performance consistent throughout the life of the battery.A more sophisticated algorithm
incorporatingadditional measurementsthataretailored tothespecificapplication maybe necessary.
This is similar to what is required for Lithium Iron Disulfide and
rechargeable Nickel Metal Hydride
batteries.