EWT Factory Support IFR26650 4S 12AH 12V Lifepo4 Battery Pack
species |
Lithium Iron Phosphate |
Voltage | 32700-12V |
capacity | 12AH |
Batteries | IFR32700 3.2V 6Ah |
size | 151*99*100mm |
weight | 2.0KG |
Maximum charging current | 10A |
Maximum discharge current | 15A |
Display screen | No |
Communication support | No |
1. Lithium battery buck-boost test
First of all, let the lithium battery be lowered to 3.3V through
the step-down chip, and then power the microcontroller and
Bluetooth module, and then plan to rise to 7V to bring a load.
Result: The Bluetooth module does not work and cannot be searched.
Remove Bluetooth, the microcontroller and the load are working
normally. When the microcontroller is removed, the Bluetooth works
normally with the load. When a step-down is not used, all three
work normally when a separate set of power supplies is given.
Note: XC6206 for buck and FD6291 for step-up.
2. Lithium battery step-up and step-down issues
The single voltage of lithium-ion batteries has a certain range,
for example, the normal working voltage range of lithium iron
phosphate batteries is 2.5V-3.65V, and the normal working voltage
range of lithium manganese oxide and ternary batteries is 3V-4.2V.
Lithium-ion batteries require battery protection boards when the
total voltage is 60V and below. For 60V or more, a battery
management system (BMS) is required. The role of these two devices
is to protect the battery for normal operation.
Note that after the number of strings in the battery pack is set,
the battery pack voltage cannot be adjusted arbitrarily. That is,
the voltage change of the battery pack can only change within the
normal operating voltage range: when charging, it rises from the
lower voltage limit to the upper voltage limit. When using
electricity, it drops from the upper voltage limit to the lower
voltage limit.
Understand this problem, if you want the lithium battery to have a
large range of buck-boost voltage, you can adjust it at will.
