24V 60Ah LiFePO4 car Battery Replacement
| Specifications | 24V 60Ah LiFePO4 battery |
| Nominal voltage | 25.6V |
| Nominal capacity | 60Ah |
| Cell specification | 3.2V 60Ah LFP cell |
| Cell combination | 8S1P-8PCS cells |
| Type | 1.5kwh lithium battery |
| Discharge cut-off voltage | 21.6V |
| Charge cut off voltage | 29.2V |
| Rated discharge current | 100A |
| Peak discharge current | 150A |
| Rated power | 2500W |
| Max continuous charge current | 0.5C-30A |
| Peak charge current | 1C-60A |
| Charge Temperature Range | 0-45C |
| Discharge Temperature Range | -20-60C |
| Battery size | 225*285*275mm |
| Weight | 18KGS |
| Charging cycles | More than 2500 times |
| Application | Electric scooter ,bike ,bicycle ... |
Pictures
Knowledge of battery
Thermal Runaway
One of the main causes of danger for lithium-ion cells is related
to the phenomenon of thermal runaway. This is a heating reaction of
the battery in use, caused by the nature of the materials used in
the chemistry of the battery.
Thermal runaway is mainly caused by the solicitation of batteries
under specific conditions, such as overload under adverse climatic
conditions. The result of a thermal runaway of a cell depends on
its level of charge and can lead in the worst case to an
inflammation or even an explosion of the Lithium-Ion cell.
However, not all types of Lithium-Ion technology, due to their
chemical composition, have the same sensitivity to this phenomenon.
The figure below shows the energy produced during an artificially
induced thermal runaway
It can be seen that among the Lithium Ion technologies mentioned
above, LCO and NCA are the most dangerous chemicals from a thermal
runaway point of view with a temperature rise of about 470°C per
minute.
The NMC chemistry emits about half the energy, with an increase of
200°C per minute, but this level of energy causes in all cases the
internal combustion of materials and the ignition of the cell.
In addition, it can be seen that LiFePO4 – LFP technology is is
slightly subject to thermal runawayphenomena, with a temperature
rise of barely 1.5°C per minute.
With this very low level of energy released, the thermal runaway of
the Lithium Iron Phosphate technology is intrinsically impossible
in normal operation, and even almost impossible to artificially
trigger.
Combined with a BMS, Lithium Iron Phosphate (LifePO4 – LFP) is currently the most
secure Lithium-Ion technology on the market.
Mecanical Safety of Lithium-Ion Cells
Like thermal runaway, Lithium-ion cells have a different level of
safety depending on the shocks or mechanical treatments they may
undergo during their lifetime.
The nail penetration test is the most revealing way to qualify the
safety of a cell technology.
The test presented below is performed by perforating a Lithium Ion
NMC cell and a Lithium Ion LiFePO4 cell.
We find here the same extremely stable behavior of Lithium Iron
Phosphate cells while the NMC cell ignites almost immediately.
For information, the LCO, NCA, or Lithium Polymer cells have a
similar behavior to the NMC in a perforation test (immediate
inflammation)
