Currently, the mainstream markets for lithium iron phosphate (LFP) batteries are electric buses and electric passenger vehicles. However, questions regarding LFP battery charging are also increasing. For example, can LFP batteries be charged every day? Is it good to charge LFP batteries anytime? So, today we'll look at the correct charging method for LFP batteries.
Based on the working principle of lithium battery packs, the correct usage methods mainly include three aspects: charging, discharging, and maintenance.
Firstly, regarding charging, the correct charging method for lithium battery packs is to follow the principle of charging when necessary and charging until fully charged. This mainly involves avoiding overcharging during the use of lithium battery packs; that is, the lithium battery pack should be recharged when the battery is nearly fully charged.
Secondly, fully charging prevents overcharging. For lithium-ion batteries in the industrial sector, charging used to be relatively slow, taking 8-12 hours for a single charge. Lithium battery packs, on the other hand, can be fast-charged. A lithium battery of the same capacity as a storage battery can be fully charged in about 4 hours. Therefore, it is important to be careful when charging lithium battery packs and not to charge them according to the charging time of storage batteries.
Finally, avoid multitasking. Simply put, don't charge the lithium battery while it's running. The main reason for this is simple: it will reduce the lifespan of the lithium battery pack.
Improper use can lead to battery degradation and thus affect battery life. The following points should be noted:
1. Frequent fast charging. Many new energy vehicles support fast charging, so many car owners choose to fast charge to quickly charge their vehicles and ensure normal operation. Fast charging is a good feature, but frequent use of fast charging can reduce the battery's recovery capacity, thereby reducing the number of charge-discharge cycles and causing some damage to the battery.
2. Prolonged storage in low temperatures. Currently, the batteries for new energy vehicles on the market are mainly divided into two types: ternary lithium batteries and lithium iron phosphate batteries. Although they perform differently when exposed to low temperatures, both types of batteries experience battery degradation when exposed to low temperatures.
3. Charge frequently when the battery is low. Since lithium-ion batteries do not have a memory effect, electric vehicles, like our smartphones, should be charged whenever needed, and you should try not to let the battery run completely out before charging.
4. Heavy acceleration. Because electric vehicles are known for their excellent acceleration, some drivers like to floor the accelerator for a powerful push. However, it's important to understand that high current discharge causes a sharp increase in battery internal resistance, and frequent driving in this manner can potentially damage the battery.
