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Misunderstandings about Lithium Battery Discharge

Oct. 30, 2020

"The more the lithium battery is discharged, the greater the loss of the battery," said Tom Hartley, a professor of electronic engineering at Aikeron University who helped NASA study extending battery life. "The more fully charged the battery is. , The loss of the battery will be greater. The lithium battery is in the middle of the charge, so the battery life is long."

First of all, too high and too low power states have an adverse effect on the life of lithium batteries, and the number of charge and discharge cycles is of secondary importance. In fact, the number of rechargeable cycles marked on most of the electrical appliances or batteries sold is based on 80% discharge as a benchmark test. Experiments show that for some laptop lithium batteries, the battery voltage often exceeds the standard voltage by 0.1 volts, that is, from 4.1 volts to 4.2 volts, then the battery life will be halved, and if it is increased by 0.1 volts, the life will be reduced to 3 One part; the long-term low or no power state will make the resistance of the battery to the movement of electrons become greater and greater, thus causing the battery capacity to become smaller. NASA set the battery power consumption on its Hubble Space Telescope at 10% of the total capacity to ensure that the battery can be repeatedly charged and discharged 100,000 times without needing to be updated.

Second, temperature also has a greater impact on the life of lithium batteries (mobile phones and other small electronic devices can ignore this point). The environment below freezing point may cause the lithium battery to burn out when the electronic product is turned on, while the overheated environment will reduce the battery capacity. Therefore, if the notebook is used for a long time without removing the battery from an external power source, the battery will remain in the high heat discharged from the notebook for a long time. More importantly, the battery will be in a state of 100% power for a long time and will soon be scrapped.

From the above, we can sum up the following points to ensure the capacity and life of Lithium Ion Rechargeable Battery:

At present, most electronic products use lithium batteries. Since their introduction in 1990, lithium-ion batteries have developed rapidly due to their excellent performance and have been widely used in society. Li-ion Battery Company It has also been developed on a large scale. There is no need to charge the lithium battery to 100% full, let alone run out of power. When the situation permits, try to keep the battery's capacity near the half-full state, the smaller the range of charging and discharging, the better;

The factory design of the general Chevy Volt electric car is to force the battery to be maintained at 20% to 80%, and the built-in battery of the Apple laptop may also use this method (including some other laptops and electronic products) to make the battery's capacity The number of charge and discharge cycles increases.

Lithium Ion Rechargeable Battery

Lithium Ion Rechargeable Battery

Do not use Li-ion Battery (especially laptop lithium battery) for a long time when the device uses an external power source. Even if your notebook has good heat dissipation, 100% of the long-term power is equivalent to the murder of lithium batteries.

1. If you use an external power supply to power your laptop for a long time, or the battery power has exceeded 80%, immediately remove the battery of your laptop. You don’t need to fully charge the battery at ordinary times. You can charge it to about 80%; adjust the operating system power supply Option, adjust the battery level alarm to more than 20%. Normally, the battery level should not be lower than 20%, and the battery should be charged before it drops to 20%;

2. For small electronic devices such as mobile phones, immediately disconnect the power cord (including the USB port for charging function) after charging, and it will continue to damage the battery; charge it frequently, remember to charge it, but you do not have to fully charge the battery;

3. Regardless of whether it is a notebook or a mobile phone, etc., do not let the China Li-ion Battery run out;

4. If you are going to travel, fully charge the battery, but please remember to charge the appliance at any time when conditions permit. For battery life, do not wait until the battery is dry.

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