The impact of fast charging on lithium batteries Lithium - Ion Battery Equipment

The impact of fast charging on the life of lithium batteries -Lithium - Ion Battery Equipment

Frequent fast charging will have a certain degree of impact on the batteries currently carried by electric vehicles, which varies according to the type of battery. At present, electric vehicles are generally equipped with lithium-ion batteries and lead-acid batteries. Among them, lithium-ion batteries also include lithium iron phosphate batteries and ternary lithium-ion batteries. Different types of batteries need to be analyzed differently.

Lead-acid batteries are currently mainly used in miniature electric vehicles. Generally, the fast charging mode is divided into three stages, constant current, constant voltage, and trickle charging. Due to the excessive current and voltage of fast charging, the heating of the battery will inevitably reduce the electrolyte inside the battery, resulting in a reduction in capacity and a continuous reduction in driving range.

Lithium-ion batteries are lighter in weight and higher in energy density, and are currently widely used in most electric vehicles. Lithium-ion batteries are devices that generate electrical energy through chemical reactions. When fast charging, there will be a large current and voltage input instantaneously. Frequent use of fast charging will reduce the reducing ability of the battery, thereby reducing the number of charging and discharging cycles, causing damage to the battery. certain damage.(Lithium - Ion Battery Equipment)

For lithium iron phosphate batteries, the number of cycles will decrease at low temperatures, resulting in a decrease in battery capacity. It has a relatively low density. If it is fast charged, it will be tantamount to worsening the mileage. The low temperature has little effect on the ternary lithium-ion battery, but it will show unstable characteristics at high temperature. For example, if a large current input is used when the external temperature exceeds a certain range, it may cause a certain battery in the battery pack. Overheating leads to the phenomenon of thermal failure over time.

Compared with the two, in the fast charge mode, the safety of the lithium iron phosphate battery is relatively high, which is due to its low energy density and less impact on the battery core in the fast charge mode. However, the ternary lithium-ion battery is smaller in size and higher in density. It is precisely because of its active chemical properties that it is easier to oxidize with oxygen in the air. When the charging temperature is higher than the specified range by a certain percentage, Combustion is easy to occur.



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