How long is the service life of the ternary lithium battery

In terms of battery life, the service life of lithium batteries in general electronic products is about 5-20 years, with an average of 8 years. However, according to the current level of technology, the service life of lithium batteries in electric vehicles is only about 3 to 5 years. The reason for the shorter battery life of electric vehicles is the influence of the working environment and large-scale charging and discharging. The cycle number of ternary lithium is about 500~1000 times, and the cycle number of lithium iron phosphate is about 2000 times. If the battery capacity of the electric vehicle is reduced to less than 80% of the initial capacity, the mileage of the electric vehicle will be significantly reduced. When the battery capacity drops below 70%, the battery must be replaced. For example, Chery eq runs 200 kilometers, at least 500 times, and the overall operating conditions at 80% are 160 kilometers, 500x160u003d80,000. In other words, when Chery eq actually runs about 80,000 kilometers, its battery capacity will drop to 80% of its original capacity; if it runs about 320,000 kilometers at 2000 times the speed of lithium iron phosphate, it will run about 640,000 kilometers at 400 kilometers. . For many pure electric vehicles today, the cost of the battery accounts for about 40% of the total cost of the car. In other words, replacing the battery is equivalent to replacing a small part of the car. At present, mainstream battery manufacturers promise more than 500 times (charge and discharge under standard conditions) in the specifications of their processed ternary batteries. However, after the batteries are assembled into a battery pack, due to consistency issues, the voltage and internal The resistance can not be exactly the same, and its cycle life is about 400 times. The manufacturer recommends that the SOC use window is 10%~90%. Deep charge and discharge are not recommended, otherwise it will cause irreversible damage to the positive and negative structure of the battery. If it is calculated by shallow charge and shallow discharge, the cycle life will be at least 1000 times. In addition, if lithium batteries are often discharged in high-rate and high-temperature environments, the battery life will be drastically reduced to less than 200 times. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.