La description
This is the most safe, longest cycle life, and more powerful then
normal Li-Polymer battery, but generally more expensive than normal
Li-Polymer battery. a- Cylindrical LiFePO4 This type is high rate,
has 5C, *0C, *0C and so on. always used in power tools, model
planes, electrical toys, electrical vehicles, and so on. b- power
LiFePO4 This type is always used in electrical vehicales, such as
ebike, escooters. golf-cart, and storage battery in solar-wind
projects. the discharge rate is from 2C to *0C. Advantages of
LiFePO4 Battery: Faster charging and safer performance It is clear
that the small capacity Li-ion (polymer) Battery containing lithium
cobalt oxide (LiCoO2) offers a genuinely viable option for
electronics and digital applications. However, lithium cobalt oxide
(LiCoO2) is very expensive and un-safe for large capacity Li-ion
Battery. Recently lithium iron phosphate (LiFePO4) has been
becoming "best-choice" materials in commercial Li-ion (polymer)
Batteries for large capacity and high power applications, such as
lap-top, power tools, e-wheel chair, e-bike, e-car and e-bus. A
LiFePO4 battery has hybrid characters: as safe as lead-acid battery
and as powerful as lithium ion cells. The advantages of large
format Li-ion (polymer) batteries containing lithium iron phosphate
(LiFePO4) are listed as below: 1. Fast charging: During charging
process, a conventional Li-ion Battery containing lithium cobalt
oxide (LiCoO2) needs two steps to be fully charged: step 1 is using
constant current (CC) to get *0% State of Charge (SOC); step 2
takes place when charge voltage reaches 4.2V, upper limit of
charging voltage, turning from CC to constant voltage (CV) while
the charging current is taping down. The step 1 (*0%SOC) needs two
hours and the step 2 (*0%SOC) needs another two hours. LiFePO4
battery can be charged by only one step of CC to reach *5%SOC or be
charged by CC+CV to get **0%SOC. The total charging time will be
two hours. 2. Large overcharge tolerance and safer performance A
LiCoO2 battery has a very narrow overcharge tolerance, about 0.1V
over 4.2V of charging voltage plateau and upper limit of charge
voltage. Continuous charging over 4.3V would either damage the
battery performance, such as cycle life, or result in firing and
explosion. A LiFePO4 battery has a much wider overcharge tolerance
of about 0.7V from its charging voltage plateau 3.4V. Exothermic
heat of chemical reaction with electrolyte measured by DSC after
overcharge is only *0J/g for LiFePO4 verse ***0J/g for LiCoO2. The
more is the exothermic heat, the larger energy heating up the
battery in its abusive condition, the more chance toward firing and
explosion. A LiFePO4 battery would be overcharged up to *0V without
protection circuit board. It is suitable for large capacity and
high power applications. From viewpoint of large overcharge
tolerance and safety performance, a LiFePO4 battery is similar to
lead-acid battery. 3. Self balance Alike lead-acid battery, a
number of LiFePO4 cells in a battery pack in series connection
would balance each other during charging process, due to large
overcharge tolerance. This self balance character can allow *0%
difference between cells for both voltage and capacity
inconsistency. 4. Simplifying battery management system (BMS) and
battery charger Large overcharge tolerance and self-balance
character of LiFePO4 battery would simplify battery protection and
balance circuit boards, lowering their cost. One step charging
process would allow to use simpler conventional power supplier to
charge LiFePO4 battery instead to use a expensive professional
Li-ion battery charger. 5. Longer cycle life In comparison with
LiCoO2 battery which has a cycle life of **0 cycles, LiFePO4
battery extends its cycle life up to ***0 cycles. 6. High
temperature performance It is detrimental to have a LiCoO2 battery
working at elevated temperature, such as *0 ?. However, a LiFePO4
battery runs better at elevated temperature, offering *0% more
capacity, due to higher lithium ionic conductivity. Any interest in
our product or want to know more, please contact me freely. My
skype is arlene***3. And my email is
arlene(at)gebattery(dot)com(dot)cn.
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LFP
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LiFePO4 batteries
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