 Profile Li-ion
Polymer BatteryPrecautions
for using Li-ion Batteries |
|
| PRECAUTIONS
FOR USING Li-ion BATTERIES |
|
 Li-ion
POLYMER BATTERY |
|
 Specification
tables |
1.
Charging |
| Overview |
>Charging
current
Charging
current should be less than maximum charge current specified in
the cause Product
Specification. Charging with higher current than recommended value
maydamage
to cell electrical, mechanical, and safety performance and could
lead to heatgeneration
or leakage.
>Charging voltage Charging
shall be done by voltage less than that specified in the Product
Specification
(4.2V/cell). Charging beyond 4.25V, which is the absolute maximumvoltage,
must be strictly prohibited. The charger shall be designed to comply
with this
condition.It
is very dangerous that charging with higher voltage than specified
value may cause damage
to the cell electrical, mechanical safety performance and could
lead to heatgeneration
or leakage.
>Charging temperatureThe
cell shall be charged within the specified temperature range in the
Product Specification.>Prohibition
of reverse chargingReverse
charging is prohibited. The cell shall be connected correctly. The
polarityhas
to be confirmed before wiring. In case of the cell is connected improperly,
thecell
cannot be charged. Simultaneously, the reverse charging may cause
damaging
to the cell which may lead to degradation of cell performance and
damage the cell safety,
and could cause heat generation or leakage.2. Discharging >Discharging current The
cell shall be discharged at less than the maximum discharge current
specified in the
Product Specification. High discharging current may reduce the discharging
capacity
significantly or cause over-heat.
>Discharging temperature The cell shall be discharged within the temperature range specified in the Product Specification.
>Over-discharging
It
should be noted that the cell would be at an over-discharged state
by its self- discharge
characteristics in case the cell is not used for long time. In order
to preventover-discharging,
the cell shall be charged periodically to maintain between 3.7V
and3.9V.Over-discharging
may causes loss of cell performance, characteristics, or battery
functions.The
charger shall be equipped with a device to prevent further discharging
exceeding a
cut-off voltage specified in the Product Specification.Also
the charger shall be equipped with a device to control the recharging
procedures as
follows:The
cell battery pack shall start with a low current (0.01C) for 15
- 30 minutes, i.e. pre-charging,
before rapid charging starts. The rapid charging shall be started
after the
individual cell voltage has been reached above 3V within 15 - 30
minutes that canbe
determined with the use of an appropriate timer for pre-charging.In
case the individual cell voltage does not rise to 3V within the
pre-charging time, then
the charger shall have functions to stop further charging and display
the cell/pack
is at abnormal state. |
| Features |
|
| Comparisons
between LIP and 0ther secondary batteries |
|
| Major
applications |
|
| Structural
designs |
|
| Electrochemical
processes |
|
| Characteristics
of Li-ion batteries |
|
| Electrical
& mechanical test methods |
|
| Precautions
for using Li-ion batteries |
|
| 3. Protection Circuit Module (PCM) | |
| >The cell/battery
pack shall be with a PCM that can protect cell/battery pack properlyPCM
shall have functions of (1) overcharging prevention, (2) over-discharging prevention, and (3) over current prevention to maintain safety and prevent significant deterioration of cell performance. The over current can occur by external short circuit >Overcharging prohibitionOvercharging prevention function shall stop charging if any one of the cells of the battery pack reaches 4.25V. >Over-discharge prohibitionOver-discharging prevention function shall work to minimize a dissipation current to avoid further drop in cell voltage of 2.5V or less per cell in any cell of the battery pack. It is recommended that the dissipation current of PCM shall be minimized to 0.5uA or less with the over-discharge prevention.The protection function shall monitor each bank of the battery pack and control the current all the time. |
|
| 4. Storage | |
The
cell should be stored within the proper voltage and temperature
range specified in the
Product Specification. |
|
| 5. Handling of Cells | |
Since
the battery is packed in soft package, to ensure its better performance,
it¡¯s very
important to carefully handle the battery |
|
| >Soft Aluminium foil | |
The
soft aluminum packing foil is very easily damaged by sharp edge
parts such as Ni-tabs,
pins and needles. |
|
| A. Don't strike battery with any sharp edge parts | |
| B.Trim your nail or wear glove before taking battery | |
| C.Clean worktable to make sure no any sharp particle | |
 |
|
| >Sealed edge | |
| Sealing edge is very flimsy. | |
| Don't bend or fold sealing edge | |
 |
|
| >Folding edge | |
The
folding edge is form in battery process and passed all hermetic
test |
|
| Don't open or deform folding edge | |
 |
|
| >Tabs | |
| The battery tabs are not so stubborn especially for aluminum tab. | |
| Don't bend tab. | |
 |
|
| >Mechanical shock | |
| Don't Fall, hit, bend battery body. | |
 |
|
 |
|
| >Short | |
| Short terminals of battery is strictly prohibited, it may damage battery. | |
| 6. Notice for Designing Battery Pack | |
| >Pack design | |
A.
Battery pack should have sufficient strength and battery should
be protected from mechanical
shock |
|
| B. No Sharp edge components should be inside the pack containing the battery. | |
| >PCM design | |
| A. The over-charge threshold voltage should not be exceed 4.32V | |
| B. The over-discharge threshold voltage should not be lower than 2.10V | |
| C. The PCM should have short protection function built inside | |
| 7. Notice for Assembling Battery Pack | |
| >Tab connection | |
A.
Ultrasonic welding or spot welding is recommended to connect battery
with PCM or
other parts. |
|
B.
If apply manual solder method to connect tab with PCM, below notice
is very important
to ensure battery performance. |
|
| a. The solder iron should be temperature controlled and ESD safe. | |
| b. Soldering temperature should not exceed 350 celsius. | |
| c. Soldering time should not be longer than 3s. | |
| d. Soldering times should not exceed 5 times. | |
| e. Keep battery tab cold down before next time soldering. | |
f.
Directly heat cell body is strictly prohibited, Battery may be damaged
byheat
above approx. 100
celsius |
|
| >Cell fixing | |
| A. The battery should be fixed to the battery pack by its large surface area. | |
| B. No cell movement in the battery pack should be allowed. | |
| 8. Others | |
Prevention
of short circuit within a battery packEnough
insulation layers between wiring and the cells shall be used to
maintainextra
safety protection.The
battery pack shall be structured with no short circuit within the
battery pack, which
may cause generation of smoke or firing. |
|
| >Prohibition of disassembly | |
| A. Never disassemble the cells | |
The
disassembling may generate internal short circuit in the cell, which
maycause
gassing, fining, explosion, or other problems. |
|
| B. Electrolyte is harmful | |
LIP
battery should not have liquid from electrolyte flowing, but in
case theelectrolyte
come into contact with the skin, or eyes, physicians shall flush
theelectrolyte
immediately with fresh water and medical advice is to be sought. |
|
| >Prohibition of dumping of cells into fire | |
Never
incinerate nor dispose the cells in fire. These may cause explosion
of the cells,
which is very dangerous and is prohibited. |
|
| >Prohibition of cells immersion into liquid such as water | |
The
cells shall never be soaked with liquids such as water, seawater,
drinks suchas
soft drinks, juices, coffee or others. |
|
| >Battery cells replacement | |
The
battery replacement shall be done only by either cells supplier
or devicesupplier
and never be done by the user. |
|
| >Prohibition of use of damaged cells | |
The
cells might be damaged during shipping by shock. If any abnormal
features of the
cells are found such as damages in a plastic envelop of the cell,
deformation of the
cell package, smelling of an electrolyte, an electrolyte leakage
and others, thecells
shall never be used any more.The
Cells with a smell of the electrolyte or a leakage shall be placed
away from fireto
avoid firing or explosion. |
|
| Note: | |
A.The
customer is requested to contact us in advance, if and when the
customerneeds
other applications or operating conditions than those described
in this document.
Additional experimentation may be required to verify performance
and safety
under such conditions. |
|
B.We
will take no responsibility for any accident when the cell is used
under other
conditions than those described in this Document. |
|
| C.We will inform, in a written form, the customer of improvement(s) regardingproper use and handling of the cell, if it is deemed necessary. | |
