What harm does lithium battery overcharge have?

There are several operations that can permanently damage a lithium battery, two of which are overcharging and overdischarging. What does it mean to overdo it, you ask? What harm do they do to lithium batteries? How can we avoid overcharging and overdischarging of lithium batteries in daily use? Here's an answer!

I. Overcharge and harm of lithium battery

1. Overcharge means that when a lithium battery is overcharged, the charging working voltage of the battery exceeds the set working voltage. For example, rechargeable batteries are rated at ± current. That is, if the maximum operating voltage is higher than 9V, it is called overcharge.

2. In the process of overcharge, the battery voltage rise with the enlargement of the polarization and fast, lead to irreversible changes in the positive active material structure, lead to lithium battery electrolyte solution, producing a large amount of steam, release a large number of calorific value, battery temperature and pressure, the diaphragm dissolve or closed, causing the battery short-circuit fault of contact between the anode and cathode material, Security risks such as explosion and fire may exist.

Second, the harm of lithium battery overdischarge motor

1. Overdischarge refers to the charge-discharge process when the working voltage reaches the rated current. For example, if the rated charge-discharge voltage of a ternary lithium battery is less than the rated charge-discharge voltage, it is overdischarge. What are the dangers of excessive discharge to rechargeable batteries?

2. When the battery discharges external electrical energy and the operating voltage reaches a certain value, the redischarge will cause overdischarge of the rechargeable battery. Excessive battery discharge can have a devastating impact on the battery, especially the power failure or large current repeated discharge will cause greater damage to the battery. In general, overdischarge increases the pressure of the battery, destroys the intersection of positive and negative active substances, dissolves the electrolyte of the lithium battery, accumulates negative lithium, and increases resistance. Even if the battery is only partially repaired after charging, the volume will have a significant decay coefficient.

3. How to avoid overcharging or overdischarging the battery in daily use?

1. It is used with the special lithium battery protection board (BMS) for lithium batteries. The lithium battery protector can charge and maintain the rechargeable battery. The smart version can also set the working voltage of battery charging and discharging, which can better maintain the rechargeable battery.

2. Lithium battery chargers for supporting facilities do not use fast charging.

3. When the battery voltage reaches the operating voltage set by the lithium battery protection board, the lithium battery protection board will turn off the power to maintain the rechargeable battery, but the lithium battery will fall and the operating voltage will rise, slightly higher than the operating voltage set by the lithium battery protection board. This time will no longer apply. Continued use will inevitably cause damage to the rechargeable battery.

We can see the damage that can be done to lithium batteries by overcharging them! To avoid them, it is necessary to buy qualified lithium batteries with protection, and pay more attention to avoid overcharging and overdischarging in use!

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