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Lithium ion battery manufacturers interpret the issue of attenuation in ternary lithium-ion battery packs. As for the issue of attenuation in ternary lithium-ion battery packs, it is currently impossible to solve with the current level of technology. We can only determine whether it is normal or abnormal decay based on the feedback provided by the battery today. At present, according to national regulations, the performance degradation of batteries during the warranty period shall not exceed 20%. Otherwise, lithium-ion battery manufacturers shall replace them free of charge.

Lithium ion battery manufacturers interpret the issue of attenuation in ternary lithium-ion battery packs

The voltage platform of ternary lithium-ion battery packs is very high, and under the same volume or weight, the specific energy and power of ternary lithium-ion batteries are higher. In addition, ternary lithium-ion batteries have great advantages in high rate charging and low temperature resistance.

Due to its smaller size, higher capacity density, and low temperature resistance, ternary lithium-ion battery packs are widely used in new energy vehicles, such as Tesla, which uses ternary lithium-ion batteries in all its models.

The lifespan of a ternary lithium-ion battery is 2000 charge discharge cycles, which can be counted as one charge per day and can last for over 5 years. However, there is still a difference between actual use and theory. If 1000 charge discharge cycles are carried out, the ternary lithium-ion battery has essentially decayed by 50%, which means that the battery can only run half of its original mileage. In addition, an excellent lithium-ion battery management system can also slow down the degradation of ternary lithium-ion batteries.

The lifespan of a ternary lithium-ion battery refers to the end of its lifespan when its capacity decays to 70% of its nominal capacity after a period of use. The first year of purchasing an electric vehicle has a significant decline, usually around 8%; In the following 2-3 years, it will decrease by 4%; The attenuation gradually slows down over 5-6 years of continuous use, usually only 1%.

The essence that affects the capacity degradation of ternary lithium-ion battery packs is the reduction of removable lithium ion content, which is mainly caused by the structural damage or deactivation of positive and negative electrode materials, analysis of electrolyte, and abuse of lithium-ion batteries. The charging and discharging process of a battery is a complex electrochemical process, and the factors that cause capacity degradation of the battery are not single. The deterioration of one aspect may trigger other factors to jointly affect the capacity, cycling performance, energy density, etc. of the battery.

In terms of lithium-ion battery degradation, lithium-ion battery manufacturers have also set a threshold value of 20%. If the degradation exceeds this value during the warranty period, there will be corresponding replacement services. As is well known, battery degradation is directly related to the daily driving experience. Next, let's talk about the issue of degradation value.

One type is the ternary lithium-ion battery pack represented by Tesla, which has higher energy density, small size, and light weight. However, due to heat dissipation being a major issue, it requires additional space and weight to install a water-cooled cooling system, and its safety is not as good as iron batteries. In addition, its battery decays relatively quickly, with approximately 800-1200 full charge cycles resulting in a 20% decay.

It should be noted that once significant attenuation is observed in the ternary lithium-ion battery, it can be immediately confirmed 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 warranty range, you can apply to the lithium-ion battery manufacturer for free battery replacement. If it does not exceed 20% during the warranty period, it is a normal phenomenon.

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