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ENERGIZERBATTERYMANUFACTURING
VERSION1.2
Figure11:OverviewofDifferentAirManagementTechniques
high
low
continuous inter mittent
noneorsmall
degreeofair
management
needed,sincecell
capacityisquickly
used
(1‐3months)
highdegreeofairmanagementneeded,
cellhashighairaccessbutisexpectedto
beinservicewithlongperiodsof“off”
time(>3months)
DutyCycle
Discharg eRate
throttlingneededto
maximizeservice
time(>3months )
3.2‐‐ElementsofAirManagement
Twoelementsofasuccessfulin‐deviceairmanagementsystemareameansforallowingcontrolledair
accesstothebatteryandanairplenumforevenairdistribution.Anairplenumisanairgap,orvolume,
which has access to all of the air holes on the battery.
The air plenum allows for more even air
distribution over the battery air holes, and it provides a reserve of air immediately available to the
batterytohandlepeakpowerneeds.Controllingairaccesstothebatteryisaccomplishedbycreatingan
access path to the sealed volume of air within
a device.The air access path is designed to allow a
desired amount of air to flow to the sealed volume of air, which includes the plenum, either
continuously or intermittently.A sealed volume of air can be created by sealing an entire device, a
portionofthedeviceincluding
thebatterycompartment,orjustaplenumabovetheairholesideofthe
battery.Thepowerrequirementsofthedevicedeterminetherateatwhichairisrequiredtoflowtothe
battery.
Figure 12 illustrates a simple, cost effective air management solution designed into a device.The
compartmentdoorcontainsano‐ringwhichsealsagainsttheairholesideofthebatterywhenthedoor
isclosed.Theairplenu mvolumeisdefinedbythecompartmentdoorandthesidesof the
o‐ring.A
slideswitchislocatedinthecompartmentdoortocreateanairaccesspoint.Theslideswitchactsasa
valvewhich seals thecompartment when inthe closedposition andallows air toflow tothe battery
when in the open position.The slide switch could
be mechanically manipulated by the user or
electronicallycontrolledbythedevice.