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Ternary lithium battery life

From:CTECHI GROUP Limited     Release time:2019-04-29

Overview:The panasonic lithium battery life means that after the battery has been used for a period of time, the capacity is attenuated to 70% of the nominal capacity (room temperature 25 ° C, standard atmospheric pressure, and battery capacity discharged at 0.2 C), and the end of life can be considered. In the industry, the cycle life is generally calculated by the number of cycles in which the lithium battery is fully charged.

The panasonic lithium battery life means that after the battery has been used for a period of time, the capacity is attenuated to 70% of the nominal capacity (room temperature 25 ° C, standard atmospheric pressure, and battery capacity discharged at 0.2 C), and the end of life can be considered. In the industry, the cycle life is generally calculated by the number of cycles in which the lithium battery is fully charged. During the process of use, irreversible electrochemical reactions inside the lithium battery lead to a decrease in capacity, such as decomposition of the electrolyte, deactivation of the active material, collapse of the positive and negative structures, reduction in the number of lithium ion insertion and deintercalation, etc. . Experiments have shown that higher rate discharges result in faster attenuation of the capacity. If the discharge current is lower, the battery voltage will approach the equilibrium voltage and release more energy.

The theoretical life of a ternary lithium battery is about 800 cycles, which is medium in commercial rechargeable lithium batteries. Lithium iron phosphate is about 2000 times, and lithium titanate is said to reach 10,000 cycles. At present, the mainstream battery manufacturers promise more than 500 times in the ternary battery specifications produced by them (charge and discharge under standard conditions), but after the batteries are assembled into battery packs, due to consistency problems, mainly voltage and internal The resistance cannot be exactly the same, and its cycle life is about 400 times. The manufacturer recommends that the SOC use window be 10%~90%. It is not recommended to carry out deep charge and discharge. Otherwise, it will cause irreversible damage to the positive and negative structures of the battery. If it is calculated by shallow charge and shallow release, the cycle life is at least 1000 times. In addition, if the lithium battery is often discharged in a high rate and high temperature environment, the battery life will drop to less than 200 times.

The number of life cycles of a lithium battery is determined by the battery quality and battery material:

1. The number of ternary materials is about 800 cycles.

2. The number of cycles of lithium iron phosphate battery is about 2,500.

3, the number of genuine battery and defective battery cycle is different, the original battery is designed and produced according to the number of cycles on the battery manufacturer's specification book, and the number of defective battery cycles may not be 50 times. If you want to learn more about lithium batteries manufacturers,you can contact us.


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