Reasons for the decrease of lithium-ion battery capacity and repair methods

Reasons for the decrease in the capacity of lithium-ion batteries: 1. The battery core is aging and decayed. 2. The self-discharge rate is different, resulting in unbalanced battery cells in series, which eventually leads to a decrease in the capacity of the lithium-ion battery and is not durable. 3. In the process of battery use and charging and discharging, vulcanization phenomenon will affect the battery capacity. The vulcanization performance of the battery is: the battery itself is low in voltage, it will be full after charging, and it will be gone after discharging. The softening of the battery is manifested as: the liquid inside the battery is turbid and black. The capacity of the battery decreases, and the lead powder falls off after a long period of time. 4. Improper charging in summer and winter. The battery charging voltage is inversely proportional to the ambient temperature, so the summer temperature is high, and the overcharge of the lithium-ion battery causes the battery to lose water, which causes the battery to swell and deform. In winter, the driving mileage decreases due to undercharging. There are two common ways to repair lithium-ion battery capacity decline: freezing method and overcharge and overdischarge method. 1. In the freezing method, the old mobile phone lithium-ion battery that automatically shuts down is tightly wrapped with plastic wrap. When wrapping, it is as compliant as possible. There are three layers inside and outside to ensure that the battery is in a vacuum state. Then, wrap three layers of newspaper outside the plastic wrap to completely seal the lithium-ion battery. Put it in the freezer layer of the refrigerator. After 48 hours, take out the battery and remove the six layers of paper film wrapped one by one. The lithium-ion battery does not cause surface expansion or deformation due to freezing. After cooling for a period of time, then charge. 2. The method of overcharging completely discharges the lithium-ion battery that is close to being scrapped, and then recharges the battery to activate it. The specific method is: deep discharge of the mobile phone is to achieve a deeper recharge by depleting the internal electric energy, which requires some unconventional methods. Use a specific device to connect the mobile phone to a small low-voltage light bulb, and the power inside the battery will be transferred to the light bulb until all of it is discharged. The mobile phone slowly runs out of power through a lower voltage. Under normal circumstances, if the mobile phone is connected to the rated voltage of less than 3.6 volts, it will automatically shut down. After the battery is discharged, the recharged mobile phone battery can be used for a longer time. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: How long do you know how long the lithium-ion battery of electric vehicles can be used?