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What is the relationship between battery cycle life and depth of charge and discharge (DOD)?

main content

There is a close relationship between battery cycle life and depth of charge and discharge (DOD). Depth of charge and discharge (DOD) refers to the ratio of the amount of electricity used by each discharge to the total battery power. The results show that the shallow discharge depth has a positive effect on the cycle life of the battery. Specifically, a lower DOD can significantly extend the cycle life of the battery. For example, if the battery is reduced from 100% charged to 50% recharged, then DOD is 50%, and multiple studies have shown that lower DOD can significantly extend battery cycle life.

For LiFePO4 batteries, different DOD has a significant impact on cycle life. At lower DOD, the cycle life of LiFePO4 batteries can be significantly improved. For example, it has been noted that LiFePO4 batteries may have a cycle life of up to 14,000 cycles at 10% DOD, while at 100% DOD the battery may have a cycle life of only 2,000 to 3,000 cycles (conservative estimates). This means that the battery can withstand more charge and discharge cycles at a shallower discharge depth, thus extending its service life.

In addition, the effect of discharge depth on the attenuation of battery capacity is also significant. The study found that in the early stage of battery cycle, the capacity of LiFePO4 battery under different discharge depths changed the same law, indicating that the discharge depth had no effect on the early cycle life of the battery. However, as the cycle continues, the greater the depth of discharge, the faster the battery capacity decay, the faster the battery cycle life decline. This shows that the use mode of deep charging and deep discharge will lead to faster attenuation of battery capacity, while shallow charging and shallow discharge will help delay the attenuation of battery capacity, thereby extending the service life of the battery.

CONCLUSION

In summary, there is a direct relationship between battery cycle life and depth of charge and discharge (DOD). Shallow discharge depth helps to extend the cycle life of the battery, while deep discharge will accelerate the attenuation of the battery capacity and shorten the service life of the battery. Therefore, in practical applications, reasonable control of charge and discharge depth is one of the important strategies to optimize battery performance and extend battery life.

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