Many warning signs may occur when a lithium iron phosphate battery is overcharged. These signs include: These signs are not exclusive to overcharging and may also indicate other issues. Additionally, overcharging can occur even without exhibiting these signs. Therefore, a BMS is the best way to detect and prevent overcharging.
For example, the full-charge voltage of a monolithic lithium iron phosphate cell is 3.65V. When the charge exceeds 3.65V, it is overcharged. What will happen when a lithium-ion polymer (LiPo) battery is overcharged? Overcharging a battery cell will cause permanent damage to the cell.
Driven by this, an experimental investigation was carried out to study the characteristics of TR and gas venting behaviors in commercial lithium iron phosphate (LFP) batteries that were induced by overcharging under different rates.
Discharge the cells enough to decrease the cell voltage to a normal range, such as 3.2V for lithium-iron phosphate batteries. If the battery cells have a pressure safety valve, open it. Not all cells have a safety valve. And the steps to release it can vary based on the battery.
However, the elevated temperature accelerates the consumption of plated lithium and the deposition layer becomes thinner, resulting in a recovery of the thermal stability for the anode. Moreover, overcharge also has a significant effect on the mechanical properties of the cell components.
In addition to the influence of the charging method, Wang et al. compared the thermal runaway behavior of the cell with different cathode materials, and found that the ternary batteries had better overcharge tolerance performance, while lithium iron phosphate batteries had a lighter response to overcharge.
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