Lithium batteries are rechargeable batteries. Typically, lithium batteries are fully charged at 4.2 V. There are also batteries with other voltages. Lithium battery charging methods include fast charging, slow charging, trickle charging, constant current charging, etc. But be careful to avoid overcharging, overdischarging, short circuit protection and other problems with lithium batteries.
How much damage will overcharging and overdischarging lithium batteries cause to the battery?
If the lithium battery is overcharged, continuing to charge when the battery is full will cause the positive electrode material structure to change, resulting in loss of capacity, and its oxygen decomposition and electrolyte will cause a violent chemical reaction, and finally The bad result is of course an explosion.
UOnce the lithium battery has discharged the internally stored energy and the voltage has reached a certain value, continued discharge will cause over-discharge. The discharge cut-off voltage is generally determined based on the discharge current. The general setting for 0.2 C to 2 C discharge is 1.0 V/piece, and the setting for discharge above 3 C, such as 5 C or 10 C, is 0.8 V/piece. Excessive battery discharge can have catastrophic consequences on the battery, especially large current. excessive discharge or repeated overdischarge has a greater impact on the battery.
Generally speaking, excessive discharge will increase the internal pressure of the lithium battery and destroy the reversibility of positive and negative active materials. Even if it is charged, it can only be partially restored, along with its capacity. will also be significantly reduced. Iflithium battery is deeply charged and deeply discharged, the battery loss will be greater. The ideal working state of the lithium battery is shallow charging and discharging, in which case the battery life will be longer.
Why does gas appear when a lithium battery is overcharged or overdischarged?
Ordinary lithium-ion batteries will produce a small amount of gas inside the battery during the charging process, which is usually absorbed during discharging. Too large charging current and frequent overcharging will aggravate gas production, increase the internal pressure of the lithium battery and cause swelling. A slight bulge of the battery is allowed. Avoiding overloading is the key to reducing the bulge.
In addition, the chemical properties of lithium are very active and easy to burn. When the lithium battery ist charged and discharged, the temperature inside the battery continues to rise. The gas generated during the activation process expands. and the internal pressure of the battery increases until the pressure reaches a certain level. It will rupture to a certain extent, causing leakage, fire or even explosion, so it is absolutely important to ensure its safety performance.
What will happen if the lithium battery of an electric vehicle is charged for too long?
Nowadays, electrical devices generally have battery protection. charge. Typically, they automatically stop charging when they are charging. fully charged, so there will be no impact. If there is no charging protection, be careful not to overcharge, as this will damage the battery and may even explode.
Lithium batteries also have no memory, so half a charge will have no effect.
Lithium batteries should not be exposed to water and should not be placed in damp locations. The production process of lithium-ion batteries requires several cycles of high temperature drying, especially during the production, mixing and coating of positive electrode materials, which should not be exposed to water.
Generally there will be no problems.
1. When the charging voltage is equal to the battery voltage, it enters the so-called “Wei flow” charging. This process is most important for replenishing the battery, but the electrical efficiency is also the lowest. and consumes electricity.
< p>2. Since the above process is still charging, if affected by temperature factors. Affected by loud noise or unexpected factors, the charging voltage fluctuates, and if the stability is broken, the battery may be “exploded”.3. FluctuatesMild and long-term tension tions can also cause. battery overload. And affecting battery life, this is very likely.
In summary, overcharging is harmful and unnecessary, so the charger should be removed in time after charging. The manual generally recommends no more than 24 hours of charging (some say no more than 12 hours).