What are the hazards of overcharging and discharging lithium batteries?

　　1、 Overcharging and hazards of lithium batteries

　　1. Overcharging refers to when a lithium battery is overcharged, the charging working voltage of the battery exceeds the set working voltage. For example, the rated current of a rechargeable battery is ±. If the maximum working voltage is higher than 9V, it is called overcharging.

　　During the overcharging process, the battery voltage will rapidly increase with the expansion of polarization, causing irreversible changes in the structure of the positive electrode active material, resulting in the dissolution of the lithium battery electrolyte, the generation of a large amount of steam, the release of a large amount of heat value, a significant increase in battery temperature and pressure, the dissolution or closure of the outer diaphragm, and causing contact short circuit faults between the positive electrode and the positive electrode material of the battery, posing safety hazards such as explosion and fire.

　　2、 Hazards of Overdischarge Motors in Lithium Ion Batteries

　　1. Overdischarge refers to the charging and discharging process when the working voltage reaches the rated current. For example, if the rated charging and discharging working voltage of a ternary lithium battery is lower than the rated charging and discharging working voltage, it is called over discharge. What are the hazards of excessive discharge on rechargeable batteries?

　　When the battery is discharged from external energy storage and the working voltage reaches a certain value, discharging it again will cause the charging battery to over discharge. Excessive discharge of the battery can have a devastating adverse effect on the battery, especially when it experiences power failure or repeated discharge under high current, which can cause greater damage to the battery. Generally speaking, over discharge will increase the air pressure of the battery, disrupt the intersection of positive and negative active substances, dissolve the electrolyte of the lithium battery, accumulate negative lithium, and increase resistance. Even if the battery is only partially repaired after charging, there will still be a significant attenuation coefficient in its volume.

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