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Li-Po Batteries warning & precautions
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Ni-MH Batteries handling precautions
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Li-Po Batteries warning & precautions
This document of “Battery Operating Instructions” & “Handling
Precautions and Prohibitions” shall be applied to cells of all
models which are to be manufactured and supplied by Desire Power
Co., Ltd.
Note 1.
The customer is requested to contact Desire in advance, if and
when the customer needs other applications or operating
conditions than those described in this document and “Battery
Operating Instructions”. Because additional tests and
experiments maybe necessary to verify performance and safety
under such conditions.
Note 2.
Desire will take no responsibility for any accident when the
cell is used in other conditions that those were described in
this document & “Battery Operating Instructions”.
Note 3.
Desire will inform, in written form, the customer of
improvement(s) from a view up proper using and handling of the
cell, if it is deemed necessary.
● Charging
1) Charging Current: Charging current should be less than the
maximum charge current specified in specification. Charging with
higher current than recommended may cause damage to cell
performance and safety features deeply and can lead to heat
generation or leakage.
2) Charging Voltage: Charging shall be done by voltage less that
specified in specification (4.20V/cell). Charging at above
4.25V, which is the absolute maximum voltage, must be strictly
prohibited. The charger shall be designed to be applicable to
this condition. Because it is very dangerous that the charging
with higher voltage than specified may cause damage to the cell
performance and safety features deeply and can lead to heat
generation or leakage.
3) Charging Temperature: The cell shall be charge within a range
of specified temperatures in specification. Always let the
battery cool down to ambient temperature before charging.
4) Prohibition of Reverse Charging: Do not reverse the positive
(+) and negative (-) terminals. Otherwise, during recharging,
the battery pack will be reverse-charged, abnormal chemical
reactions then may occur, and excessively high current may flow
during recharging which possibly lead to damage, overheating,
smoke emission, bursting and/or ignition.
5) Use specific Polymer charger only. Do not use a Ni-MH or
Ni-Cd charger. It is your responsibility solely to assure the
charger you purchased works properly.
6) Never charge batteries unattended. Always monitor charging
process to assure batteries are being charged properly. Always
charge the batteries in an isolated and safe area away from any
flammable or/and combustible materials.
● Discharging
1) Discharging Current: The cell shall be discharged at less
then the maximum discharge current specified in specification.
High discharge current may reduce the discharging capacity
remarkably or cause overheated.
2) Over discharging: It s should be noted that the cell will be
over discharged because of its self discharge characteristics in
case the cell is not used for a long time. In order to prevent
over discharging, the cell shall be charged periodically to
maintain around 3.0V to 3.8V. Over discharging may lead to loss
the cell’s performance, characteristics or battery functions.
The charger and the product which the battery used in shall
equip with a device to prevent further discharging exceeding a
cut-off voltage specified in specification.
● Storage / Inventory
1) The cell shall be stored in an environment with low humidity
free from corrosive gas and combustible material within a
temperature range of –10 to 40℃.
2) It is recommended to strictly observe the first-in
first-out(FIFO) principle through manufacturing and distribution
of the product.
3) A higher cell voltage during storage will accelerate the
deterioration of capacity, it is recommended to keep the cell at
a lower voltage (about 3.8V/cell) throughout the period of
storage. Storage for a long period may result in over discharge,
due to self-discharge of the cell. When stored for a period
longer than one year, charge the cell at least once a year to
about 3.8V/cell so as to prevent over discharge.
● Protection Circuit Module (PCM)
To maintain safety and prevent significant deterioration of cell
performance, the cell shall be with a PCM which can protect cell
properly. The PCM shall have the below functions:
1) Overcharge prevention; 2) Over discharge prevention; 3) Over
current prevention.
● Handling of cells
1) Aluminum Laminate Film: Easily damaged by sharp edge parts
such as Ni-tabs, pins and needles, compare with metal can case
Lithium-ion cells.
2) Cell may be damaged by heat above approximately 80℃.
Seal break may cause electrolyte leakage which may lead to short
circuit, smoke emission, bursting and/or ignition.
3) Never make the cells short circuited. It makes generation of
very high current especially for our high power series cells
which subsidiary cause heating of the cells, and may cause the
electrolyte leakage, smoke emission, ignition and/or explosion
which are very dangerous. The polymer tabs may be easily
short-circuited by putting them on conductive material. An
appropriate circuitry with PCM shall be employed to protect
accidental short of the battery pack.
4) Mechanical Shock: Polymer has less mechanical endurance than
metal can case of Lithium-ion cells. Falling, hitting and
bending may cause degradation on Polymer characteristics.
5) Handling of Tabs: the Polymer tabs are not so stubborn
especially for Aluminum tabs of positive terminal. Don’t put
much force on polymer tabs. Don’t bend tabs many times. Al tab
may easily be torn off by shear force.
● Notice for design Battery Pack
1) Pack Toughness: Battery Pack should have sufficient strength
and the polymer battery inside be protected from mechanical
shocks.
2) Cell Fixing: The polymer cell should be fixed to the battery
pack by its large surface area. No cell movement in the battery
pack should be allowed.
3) Inside Design: No sharp edge components should be inside the
pack containing the polymer battery. Enough insulation layer
between wiring and the cell shall be used to maintain multiple
safety protection.
4) Tab Connection: Ultrasonic welding is recommended for polymer
tab connection method. Polymer pack should be designed that
shear force aren’t applied.
5) For Mishaps: Pack should be designed not to generate heat
even when leakage occurred for mishaps.
▲ Isolate PCM from electrolyte leakage as perfectly as possible.
▲ Avoid narrow distance between bare circuit patterns.
● Notice for assembling Battery Pack
Shocks, high temperature or contacts of sharp edge components
should not be allowed in battery pack assembling process.
▲ Solder directly to polymer tabs is not recommended. When you
solder directly to the polymer tabs, it is necessary to consider
not to apply too high welding temperature and welding time to
guarantee the temperature transmitted to the cell lower than
80℃. Temperature above 80℃ may cause damage to the polymer cell
and degrade its performances.
▲ In case that the battery pack is fixed by ultrasonic welding,
it’s necessary to consider not to apply too much ultrasonic
welding power to the polymer cell and electronic circuits such
as PCM.
Otherwise, it may cause serious damage to the cells and
electronic circuit.
● Battery Life
Batteries that lose 20% of their capacity must be removed from
service. Discharge
the battery to 3.0V/cell, making sure output wires are
insulated, then wrap battery in a bag for disposal properly.
● Danger and Warning
Please comply with the following items, otherwise abnormal
chemical reaction may occur which will lead to the battery
damage, overheat, emit smoke, burst and/or ignite:
1) Do not disassemble or modify the battery.
2) Do not connect the positive(+) and negative(-) terminals with
a metal object such as wire, rings on your hand. Do not
transport or store the battery together with metal objects such
as necklaces, hair pins, etc.
3) Do not incinerate nor dispose the battery in fire or heat it.
4) Do not use or leave the battery near a heat source such as
fire or heater (80℃ or higher). Do not recharge the battery near
fire or in extremely hot weather.
5) Do not immerse the battery with liquid such as water,
seawater, drinks, etc. and do not allow it to get wet.
6) Do not pierce the battery with a nail or other sharp objects,
strike it with a hammer, or step on it. Do not strike and throw
the battery pack.
7) Do not use an apparently damaged or deformed battery.
8) If the battery damages, gives off an odor, generates heat,
becomes discolored or deformed, starts to balloon or swell up,
or in any way appears abnormal during use, recharging or
storage, immediately remove it from the equipment or battery
charger, disconnect the battery, stop using it and observe it in
a safe place for approximately 15minutes. The battery can still
ignite even after 10minutes due to the delayed chemical reaction
can occur.
9) Never let the temperature transmitted to the cell higher than
80℃ when direct solder the cell tabs to wire leads or devices.
It is recommended to spot welding to the cell tab with lead tabs
with pre-soldered wiring. Otherwise, heat can melt down its
insulation and damage its safety features.
10) Do not force the connection if you cannot easily connect the
battery terminals to the charger or other equipment. The
positive(+) and negative(-) terminals are arranged in a
particular orientation, confirm that the terminals are correctly
oriented.
11) Do not use the battery pack for a purpose other than those
specified.
12) Electrolyte is harmful. If the battery pack damages, and
electrolyte gets into your eyes, contacts your skin or clothing,
do not rub them, instead, rinse your eyes and/or skin, wash it
away with clean running water and immediately seek medical
attention. Otherwise, eye injury may result and skin
inflammation can occur.
13) Do not use the battery pack for a purpose other than those
specified.
14) Do not mixed use batteries with different types, models,
capacities, size, brands, charge and discharge, or new and old
in the same assembly.
15) If charging operation fails to complete even when a
specified recharging time has elapsed, immediately stop further
recharging.
16) Do not put the battery into a microwave oven or pressurized
container.
● Caution
1) Do not use or subject the battery to intense sunlight or hot
temperatures such as in a car or in hot weather. Never recharge
battery outside the specified temperature range of 0 to 45℃.
2) The battery pack incorporates built-in safety devices. Do not
use it in a location where static electricity may be present.
Otherwise, the safety device can be damaged.
3) Store the battery in a location where children cannot reach
it. Also, make sure that a child does not take out the battery
pack from the charger or equipment.
4) Before use, carefully study the “Battery Operating
Instructions” & “Handling Precautions and Prohibitions”. For
further information, contact a nearest Desire distributor or
representative. Safe keep the manual for future reference.
5) For recharging procedures, refer to the Operation Manual of
your battery charger.
6) If you find rust, a bad odor, overheating, battery balloon or
swell up, discolor, deformation, and/or other irregularities
when using the battery for the first time, return it to your
supplier or vendor
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