w w w . f u l l w a t . c o m
LIR18650-34
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Li-ion cylindrical rechargeable battery
1.4.2
Battery pack structure
(battery pack limits the number of batteries used).
The number of parallel connections is unlimited, but the battery pack must pass the overcharge test (the
charging current of the overcharge test is the maximum charge current of the charger and the product
of the parallel quantity); the number of series is unlimited and the fuse is required; the battery should be
away from the heat Device to avoid deterioration of battery performance; PCBA circuit board and battery
pack should be insulated between the insulation material (such as plastic barrier to provide air isolation
or non-conducting thermal insulation material).
If charged and discharged at high rate and high temperature (≥35ºC) frequently, cell cycle life will be
shorten. If charged and discharged at high temperature (≥55ºC) frequently, cell safety may be occurred.
1.4.3
Protection Circuit insure safety of battery
The following protection circuit should be installed in the battery pack:
Overcharge protection.
For safety reasons and in order not to shorten the cycle life, the maximum
overcharge protection voltage for the individual cells within each module should be less than 4.23V
(including tolerances);
Over discharge protection.
If the single cell voltage reaches 2.5V, we recommend that the discharge
protection should cut off the discharge current, the circuit current consumption should be as small as
possible;
Overcurrent protection.
If the discharge current of the single cell exceeds about 2C, the overcurrent
protection should cut off the discharge current circuit.
External short protection:
The battery pack has function not to cause external short cut.
Over temperature protection:
Set the temperature protection of pack according to the cell use condition
in SPEC.
Battery pack should have cell voltage balancing function and cell imbalance protection circuit.
Battery pack should have function to avoid thermal propagation when the cell is failure.
Weld spot welding lead plate onto cell, and solder lead wire or lead plate. the battery pack in the
discharge, the internal cell temperature difference should be less than or equal to 5ºC.
In order to avoid long-term storage over discharge mode, battery pack protection circuit current
consumption should be set as small as possible. Long-term use, to regularly check the remaining state
of electricity, to ensure that the battery within the single cell can not achieve over-discharge state.
1.4.4
Cell connection
Do not solder onto a cell in order to avoid a damage on the cell. The battery pack should be equipped
with appropriate shock absorbers in the pack in order to minimize shock, which can damage the cells.
1.5 Cell usage
1.5.1 When using batteries for serial and use, use the same gear, the same batch and the same state of
charge batteries, you can get this information from the inside and outside the box label. Batteries need
to be used before the detection of voltage resistance, and in accordance with its use for the combination,
God recommended at least to ensure that the use of batteries within 30mV voltage within the internal
resistance within 6mOhm.
1.5.2. Battery pack before shipment Check the voltage, internal resistance, protection line function, thermistor,
thermal fuse.
1.5.3 Transfer the batteries to the assembly process to pay special attention to prohibit the transport process
caused by external damage, the transport process is recommended to use the same transport packaging,
even if there is a process of opening the package.
1.5.4 Do not use damaged or leaked batteries due to transport damage, drop, short circuit or other reasons.