Lithium Battery Recharge Cycles Analysis

By taking good care of devices such as smartphones, tablets and notebooks, their respective batteries are most likely to survive easily, which are more often than not replaceable by users these days. With this in mind, enhancing both endurance and capacity through the right charging techniques is more important than ever.

In this article, the lithium battery recharge cycle is analyzed in depth with the connection between the transferred charge and the corresponding transfer time for charging and discharging a portable Lithium ion battery under cycles of low intensity currents.

How Many Are The Usual Lithium Battery Recharge Cycles?

"Cycle" is a key word here. It is difficult to measure their usable life as a unit of time because batteries are designed to hold a charge. For someone else, a battery that lasts two years can only last six months because it is used differently. Battery longevity is measured by charging cycles so we can have an estimate of how long to expect them to last. Typically, a phone battery is designed to last around 500 to 600 cycles, and a cycle is described as charging a fully dead battery to 100%, then draining it back to zero. It is a partial process to load a battery with a 50 percent charge left on it, then drain it down to 50%. That's why you're going to hear people telling you to charge your battery before it's full, and you're going to hear people telling you the opposite as a way of playing the game and keeping off the 500th loop. It does not work that way, of course, because the battery does not count the number of cycles of charge. It's only an estimate of five hundred.

Nonetheless, endurance can be calculated in cycles due to what occurs when a battery is charged and how it affects subsequent charging cycles, the amount of energy that can be retained and the potential (think the number of volts) of the stored charge.

When Do You Need To Recharge Your Lithium Battery?

Typically, the lifespan of a modern phone battery (lithium ion ) is 2 to 3 years, which is about 300 to 500 manufacturers rated charging cycles. The battery capacity will then start to decrease by approximately 20 percent.

In short, the higher your battery will be, the better it is. To really minimize the battery degradation, top up in the battery level for every 10 percent drop. And keep your battery level as close as possible to the middle (50%). They are impractical and unrealistic, yes. But these are just to improve the safety of the battery. There's plenty of room to tweak to add more comfort to the mix. However, Lithium ion batteries are stressed by:

• How much battery is used before recharging after discharge depth.

• Extreme low and high battery levels.

How Do You Protect Cycle Life By Checking Lithium Battery Recharge Cycles?

It is very necessary to protect the cycle life of lithium ion batteries by checking or testing the recharge cycle of batteries in order to increase the life span of lithium batteries. Therefore, the testing of cycle of such batteries is discussed here in detailed.

Testing of the cycle

This may be the most important of the qualifying tests. Cells are subject to repeated charge-cycles of discharge to verify that the cells meet or exceed the claimed cycle life of the manufacturer. Cycle life of battery is usually defined as the number of charges-discharge cycles that a battery can perform before its nominal capacity drops below 80% of its initial rated capacity. These tests are required to verify that the performance of the battery is in line with the reliability and life expectancy of the end product and will not result in excessive claims for guarantee or warranty.

Temperature, charging / discharge rates and depth of discharge each have a major impact on the cycle life of the cells depending on the purpose of the tests, temperature should be controlled at an agreed reference level in order to obtain repeatable results that can be compared to a standard. Additionally, experiments can be used to simulate conditions in which the temperature can increase or decrease to decide how the cycle life will be affected.

Similarly, cycle life is affected by overloading and over-discharging, and if the manufacturer's specification is to be verified, it is important to set the appropriate voltage and current limits.

Cycle testing is usually performed by cell banks using multi-channel testers that can create various load and discharge profiles including pulsed inputs and loads. At the same time, it is possible to monitor and record various parameters of cell performance such as temperature, capacity, impedance, power output and discharge time. Usually, a managed full charge discharge process takes about 5 hours. It means that it will take 208 days to measure up to 1000 cycles, assuming 24 hours a day to work 7 days a week. It therefore takes a long time to check the impact of any ongoing cell improvements. Because the ageing process is continuous and fairly linear, a smaller number of cycles can be used to predict a cell's lifetime. However, it would require a large number of cells and a long time to prove it conclusively in order to guarantee a product lifetime. This might be very expensive for high-power batteries.

Conclusion

It can be concluded that as the demand of lithium batteries are increasing in the upcoming years therefore it is important to take such measures to increase the shell life of lithium batteries so that it can be utilized in better way. The cycle life of batteries plays an important role to determine the last stage of battery after which it won’t be use as used before. That is why it should be check after every 2 to 3 months to know the reliability of the battery and thus the performance of battery can also be evaluated through this method which is beneficial for the battery.