Regarding the first question: What percentage is the battery threshold set to be the most conducive to prolonging the battery life?
This actually asks about the impact of different SOC (SOC=existing capacity/nominal capacity) storage of lithium-ion batteries on battery capacity; the first point to be clear is that different SOCs affect battery capacity attenuation during storage aging. It has an impact, and the specific impact is different according to different products; due to cost issues, each lithium-ion supplier and terminal manufacturer will have different requirements for different products; but for lithium-ion batteries, different SOCs have different impact on the battery. The basic law of the impact of storage aging is still used, but there may be some differences between different products;
Figure 1abc is the storage performance diagram of lithium-ion batteries with three material systems that are currently commercialized at different SOC and temperature, and the basic law can be seen As the SOC increases, the storage aging loss increases, the storage temperature increases, and the storage aging loss also increases, and the impact of high temperature on the storage aging loss of lithium-ion batteries is obviously greater than that of SOC
Figure 2 below shows the storage aging performance of different types of lithium-ion batteries under different conditions summarized in a review literature. It can be seen that the law is roughly the same as that shown in Figure 1.
Laptop batteries generally have two electrochemical systems: ternary (NCM) and lithium cobalt oxide (LCO). To prolong the service life, it is very important not to experience high temperatures. The SOC should not be too high or too low. As for lithium-ion batteries It is not recommended to store the SOC too low, because lithium-ion batteries will have self-discharge phenomenon during storage, and the risk of battery over-discharge will occur if the SOC is too low, which will cause various problems in the battery, so it is recommended 20-25 ℃, 40-60% SOC storage. You can recall carefully that for the purchased products containing lithium-ion batteries, the battery capacity of the first boot is basically between 40-80%. As for the second question, when the notebook is connected to an external power supply, the battery does not supply power, so it will not affect its performance.
Post time: Nov-22-2022