 Profile Li-ion
BatteryPrecautions
for Using Li-ion Batteries |
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PRECAUTIONS FOR USING Li-ion BATTERIES
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 Li-ion
BATTERY |
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 Specification
tables |
In
order to take full advantage of GREENCELL Li-ion batteries characteristics
in use and
in the design of battery-operated products, and also to prevent
problems due to improper
use, please pay proper attention to the following points.
1.Charging >Charge voltage Do not exceed the specified charging voltage (4.2Vx number of cells connected in series).While taking into account the environmental temperature in the charging process, fluctuations of the power supply voltage fed to the lithium ion battery, and its voltagecontrol accuracy, the charging voltage should be limited to 4.2V x number of cells connected in series as the maximum. Moreover,select a battery charger that will supply the proper or lower charging voltage even if the external supply power should exceed the specified voltage or the failure of the battery charger or other cause. >Charge currentCharge the lithium ion battery at the specified charging current (1.0CmA) or less. If the battery voltage has been reduced 3.0V x number of cells connected in series, charge the battery at small trickle current of 0.1 CmA or less.  |
| Overview |
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| Features |
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| Major
applications |
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| Structural
designs |
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| Electrochemical
processes |
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| Characteristics
of Li-ion Batteries |
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| Charging
methods of Li-ion batteries |
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| Electrical
& Mechanical test methods |
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| The
Functions of the Safety Circuits (Typical
Functions) |
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| Precautions
for using Li-ion batteries |
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| Battery
pack specification checklist |
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| Charger
specification checklist |
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| >Charge temperature | |
Charge
battery within a temperature range of 0 to 45celsius.
Do not charge the battery
at a higher temperature, which cause the battery pace to over-charged.
Consideration
should be given to the arrangement of the battery pack, So that
it is in that
temperature range even though it is affected by heat generated from
the battery charger.
At a temperature of 0¡æ
or less, the battery may not only fail to be chargedsufficiently,
but its performance might also deteriorate in various ways. |
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| >Reverse charge | |
| The battery must be protected from reverse charge. | |
| 2. Discharging | |
| >Discharge current | |
Discharge
the lithium ion battery at the specified discharge current (1.0CmA)
orless.
In the case of pulse discharge, set the mean current to 1.0CmA or
less. A peak
current of higher than 2A depending on the pulse interval, may reduce
the battery
capacity due to the characteristics of the PTC. |
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| >Discharge temperature | |
Discharge
the lithium ion battery within a temperature range of -20
to 60
celsius ,
at a
temperature of -20
celsius or
less, the battery will show a signification decrease in discharge
capacity. |
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| >0ver-discharge | |
Avoid
discharging at voltages less than 3.0V per cell. Over-discharge
will damagethe
performance of the battery, usually caused by self-discharge and
consumptioncurrent
of protection. Efforts should therefore be made to minimize leak
current of thebattery
charger etc. |
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| 3. Storage/Inventory | |
| >Storage environment | |
Store
the lithium ion battery in an environment with low humidity (45-85%)free
from
corrosive gas. |
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| Store less than 1 month: -20 - +60 celsius | |
| Store less than 3 months: -20 - +45 celsius | |
| Store less than 1 year: -20 - +25 celsius | |
A
temperature of 60
celsius
or higher and/or extremely high humidity will acceleratethe
deterioration of battery performance. Keep the battery away from
fire. |
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| >Inventory control | |
It
is recommended to strictly observe the first-in first-out (FIFO)
principle through manufacturing
and distribution of the product. |
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| >Long-term storage | |
A
higher battery voltage during storage will accelerate the deterioration
of capacity.
When storing the lithium ion batteries for an extended period, it
is recommended
to keep them at a lower voltage (about 3.8V/cell) throughout the
period
of storage.When
storaging the battery for a period longer than one year, charge
it at least once
a year (to about 3.8V/cell) so as to prevent the battery from being
over-discharged.Storage
for a very long period may result in over-discharge, due to self-discharge
of the
battery. |
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| 4. Comments related to equipment design | |
| >Reverse polarity prevention | |
The
dedicated battery charger or the equipment powered by the lithium
ion batteryshould
be designed and should have terminals so shaped as to prevent the
lithium ion
batteries from being in sorted in a reverse manner when connected
to equipment.In
addition, the construction and terminal shape should be so designed
as to protectthe
battery against possible short-circuit due to a mental necklace
or chain. Clip, or similar
objects. |
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| >Battery location | |
The
lithium ion battery should be mounted in such away that locations
subjected toheating
in the equipment are avoided. Furthermore, the equipment should
bedesigned
around the lithium ion battery with consideration of any abnormal
safety conditions
including liquid leakage.Additionally,
if the equipment emits electromagnetic waves, the battery should
belocated
so that the protection module may not be readily affected. |
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| >Countermeasures against dropping | |
The
equipment containing the lithium ion battery should be so constructed
as to sufficiently
absorb an impact from mechanical shock, the equipment, even if given
a hard
impact by dropping, should not have misplace wiring, should not
displace cellscausing
shorting or should it cause cells to leak. The design should also
be carriedout
with due consideration given to abnormal safety conditions (including
liquid leakage). |
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