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Lithium battery charging cycle knowledge analysis

Mar. 31, 2022

Lithium battery charging cycle analysis

With proper management of devices such as smartphones, tablets, laptops, etc., the respective batteries can easily survive, and today's users often cannot replace batteries. With this in mind, increasing range and capacity through proper charging technology is more important than ever.

This paper provides an in-depth analysis of the connection between the transported charge and the corresponding transport time for the charging and discharging of portable Li-ion batteries during charging cycles and low-intensity current cycles.

What is the average charge cycle of a lithium battery?

"Cycle" is the key word here. Because batteries are designed to maintain a charge, it is difficult to measure units of time. For others, it only takes 6 months with a 2 year battery. Because of the different ways of use. Battery life is measured in charge cycles, so you can predict how long the battery will last. Generally speaking, the design life of mobile phone batteries is about 500 ~ 600 cycles, and one cycle is interpreted as charging a fully discharged battery to 100%, and then recharging to 0. Loading the remaining 50% of the battery, then lowering to 50% is part of the process. So you're going to hear people talking about charging the battery before it's full, people playing games, way to stay away from 500 laps and hearing disapproval. (John F Kennedy, Game Quote) Of course, it doesn't work that way. Because the battery does not count the number of charge cycles. Just an estimate of 500.

Nonetheless, what happens to the battery as it charges, what effect does it have on subsequent charge cycles, the amount of energy that can be maintained, the potential at which the charge is stored (number of bolts), and thus the durability can be calculated on a cycle-by-cycle basis.

When should lithium batteries be charged?

In general, a modern cell phone battery (lithium-ion battery) has a lifespan of 2~3 years, which is about 300~500 manufacturers' rated charge cycles. Then the battery capacity starts to decrease by about 20%.

Simply put, the higher your battery is, the better it is. To really reduce battery degradation, increase battery power for every 10% reduction. Keep the battery level as close to the middle (50%) as possible. They are unrealistic, unrealistic. Yes. But these are just to improve the safety of the battery. There is plenty of room for adjustments to improve the comfort of the combination. However, lithium-ion batteries face the following pressures:

How much battery was used before charging after depth of discharge.

Very low, high battery power.

Lithium battery charging cycle analysis

How does checking the Lithium battery charge cycle protect the cycle life?

In order to improve the life of lithium batteries, it is necessary to check or test the battery charge cycle to protect the cycle life of lithium ion batteries. So let's discuss the cycling test of this battery in detail.

loop test

This is probably the most important qualification test. The battery is discharged through repeated charge cycles to verify that the battery meets or exceeds the cycle life claimed by the manufacturer. The cycle life of a battery is generally defined as the number of charge and discharge cycles a battery can perform before the nominal capacity falls below 80% of the initial rated capacity. These tests are designed to ensure that the battery performance meets the reliability and life expectancy of the final product and to avoid causing undue warranty or warranty claims. Temperature, charge/discharge rate and depth of discharge have a large impact on the cycle life of a battery. Depending on the purpose of the test, in order to obtain reproducible results, the temperature must be controlled at an agreed reference level. Additionally, through experiments, conditions where temperatures may be raised or lowered can be simulated to see how cycle life is affected.

Likewise, cycle life is affected by overloads and overdischarges, and in order to confirm manufacturer's specifications, it is critical to set proper voltage and current limits.

Loop tests are typically performed by battery packs using a multi-channel tester that creates a variety of load and discharge profiles, including pulse input and load. It can also monitor and record various parameters of battery performance such as temperature, capacity, impedance, power output and discharge time. In general, a manageable full charge-discharge process takes about 5 hours. That is, it would take 208 days to measure up to 1000 cycles, assuming a 24/7 working day. As such, it will take a long time to determine the impact of ongoing battery improvements. The aging process is continuous and fairly linear, so battery life can be predicted using fewer cycles. But in order to guarantee the longevity of the product, it takes a lot of batteries and a long time to justify this. This can be expensive for high power batteries.

in conclusion

It can be concluded that as the demand for lithium batteries increases in the coming years, it is important to take these measures to extend the case life of lithium batteries. The cycle life of the battery plays an important role in determining the final stage of the battery, after which it cannot be used as before. That's why the battery is checked every 2-3 months to know the reliability of the battery and therefore the battery performance can be assessed. This is good for the battery.