What are the problems with the attenuation of ternary lithium battery packs

The voltage platform of the ternary lithium battery pack is very high. Under the same volume or weight, the specific energy and specific power of the ternary lithium battery are greater. In addition, ternary lithium batteries have great advantages in terms of high-rate charging and low-temperature resistance. Due to the smaller size, higher capacity density, and low temperature resistance of the ternary lithium battery pack, it is currently being widely used in new energy vehicles. For example, we are familiar with Tesla, and all its models use ternary lithium batteries. The life of a ternary lithium battery is 2000 charge-discharge cycles, and we count it as one charge per day, which can last more than 5 years. However, there is still a difference between actual use and theory. If 1,000 charge-discharge cycles are carried out, the ternary lithium battery has actually attenuated by 50%, which means that the overflow battery can only run half of the original mileage. In addition, an excellent lithium battery management system can also slow down the attenuation of ternary lithium batteries. The life of a ternary lithium battery means that the capacity of the battery decays to 70% of the nominal capacity after a period of time, and the life is considered to be terminated. The attenuation of electric vehicles in the first year is relatively large, usually around 8%; in the following 2-3 years, it will attenuate by 4%; during the 5-6 years of continuous use, the attenuation gradually slows down, usually only 1%. The essence that affects the capacity attenuation of ternary lithium battery packs is the decrease in the content of lithium ions that can be extracted. The main factors are the structural damage or deactivation of the positive and negative materials, the analysis of the electrolyte, the abuse of lithium batteries, and so on. The charging and discharging process of the battery is a complex electrochemical process, and the factors that cause the battery capacity attenuation are not single, and the deterioration of one aspect may cause other factors to jointly affect the battery capacity, cycle performance, energy density, etc. In terms of lithium battery attenuation, lithium battery manufacturers have also given a 20% limit value. If the attenuation exceeds this value during the warranty period, there will be corresponding replacement services. As we all know, battery attenuation is directly related to the owner's daily car experience, so let's talk about the attenuation value. One is the ternary lithium battery pack represented by Tesla. It has higher energy density, small size and light weight, but because heat dissipation is a big problem, it needs extra space and quality to install a water-cooled heat dissipation system, and it is safe Not as good as iron batteries in terms of sex. In addition, its battery decays relatively quickly, about 800-1200 full charge cycles, it decays by 20%. It should be noted that once you find that the ternary lithium battery has a distinct attenuation, you can immediately confirm whether it is within the warranty period and whether the measured attenuation value is within the normal range. If the attenuation exceeds 20% within the scope of the warranty, you can apply to the lithium battery manufacturer to replace the battery for free. If it does not exceed 20% during the warranty period, it is normal. 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. Previous: Will the lithium polymer battery explode?