A major reason for the lifespan degradation of lithium iron phosphate battery packs:
1. Inconsistent internal resistance, especially polarization resistance, in lithium-ion battery packs causes drastic voltage changes in individual cells during charging and discharging, resulting in drastic changes in the voltage of the entire battery pack;
2. Inconsistent voltages in individual ultra-thin batteries will affect the peak-shaving capability of the battery pack, resulting in a reduction in the overall energy output of the lithium-ion battery pack;
3. Because ultra-thin batteries undergo heat release and absorption processes during operation, their temperature constantly changes. Overheating can lead to performance degradation and safety hazards. In recent years, it has been proven that the triggers for fires in electric vehicles during operation and testing have all been due to inadequate overheat protection causing battery overheating and fires. This applies not only to lithium manganese oxide batteries but also to lithium iron phosphate battery packs.
4. Capacity is the most serious factor in the dispersion. Inconsistent capacity will cause two major performance problems. First, some lithium iron phosphate battery packs will be in an overcharged and over-discharged state, leading to safety hazards such as combustion and explosion. Second, low-capacity cells will stop working early, affecting the energy of other cells in the entire ultra-thin battery pack, thus causing the lifespan of the entire lithium-ion battery pack to decline.
