Factors Affecting The Life Of Lithium Batteries

Factors Affecting The Life Of Lithium Batteries

Date:Dec 31, 2019

Influencing factor 1: Depth of discharge and number of recharges

It can be known from the data on the left obtained from the experiment that the number of recharges is related to the depth of discharge. The deeper the battery is, the less the number of recharges.

Rechargeable times * Depth of discharge = Total number of charge cycles completed, the higher the total number of charge cycles completed, the higher the battery life, the number of times that can be charged * Depth of discharge = Actual battery life (ignoring other factors)

Influencing factor 2: overcharge, overdischarge, and large charging and discharging currents

Avoid overcharging the battery. Any kind of overcharging of the lithium-ion battery will cause severe damage to the battery performance and even explosion.

Avoid deep discharges below 2V or 2.5V, as this can quickly and permanently damage lithium-ion batteries. Internal metal plating may occur, which can cause a short circuit, making the battery unusable or unsafe.

Most lithium-ion batteries have an electronic circuit inside the battery pack. If the battery voltage is less than 2.5V, more than 4.3V when charging or discharging, or if the battery current exceeds a predetermined threshold, the electronic circuit will disconnect the battery.

Avoid large charging and discharging currents, as large currents put excessive pressure on the battery.

Influencing factor 3: Overheated or undercooled environment

Temperature also has a greater impact on the life of lithium batteries. The environment below the freezing point may cause the lithium battery to be burned immediately when the electronic product is opened, and the overheated environment will reduce the battery capacity. Therefore, if the notebook does not remove the battery for a long time using external power, the battery will be in the high heat exhausted by the notebook for a long time and will be scrapped soon.

Influencing factor 4: full power and no power for a long time

Too high and too low power states have an adverse effect on the life of the lithium battery. Most of the rechargeable times marked on the sale of electrical appliances or batteries are based on 80% discharge testing. Experiments have shown that for some laptop computers' lithium batteries, the battery voltage often exceeds the standard voltage by 0.1 volts, that is, from 4.1 volts to 4.2 volts. / 3; The more you charge the battery, the more the battery will wear out. Long-term low power or no power state will make the internal resistance of the battery to the movement of electrons more and more larger, resulting in a smaller battery capacity. Lithium batteries are best placed in an intermediate state of charge, as they have the longest battery life.

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