Let’s first understand the reasons for the bulging of the battery:
1. Overcharging caused by overcharging will cause all lithium atoms in the positive electrode material to run into the negative electrode material, causing the original full grid of the positive electrode to deform and collapse, which is also the power of the lithium battery pack. a major reason for the decline. In this process, more and more lithium ions in the negative electrode are accumulated, and the excessive accumulation causes the lithium atoms to grow stumps and crystallize, causing the battery to swell.
2. The bulging SEI film caused by over-discharge will have a protective effect on the negative electrode material, so that the material structure is not easily collapsed, and the cycle life of the electrode material can be increased. The SEI film is not static, and there will be a little change during the charging and discharging process, mainly because some organic substances will undergo reversible changes. After the battery is over-discharged, the SEI film is reversibly broken, and the SEI protecting the negative electrode material is destroyed, causing the negative electrode material to collapse, thereby forming the bulging phenomenon of the lithium battery.If the charger used does not meet the requirements, the battery will be bulged in light, and there may be a safety accident or even an explosion.
3. Manufacturing process problems：
The manufacturing level of lithium battery packs is uneven, the electrode coating is uneven, and the production process is relatively rough. Generally, laptops are plugged in during use, and the power supply is actually mostly connected all the time. It is also normal for a bulge over a long period of time.
How to deal with the lithium battery bulge：
1. Start to replenish the power after half of the power is used up, and only perform a full discharge and full charge maintenance in rare cases (for example, after a few months to half a year, it will be fully discharged and charged once, frequently It is easy to grow crystals when charging and discharging), which can greatly reduce the amount of crystals and significantly slow down the bulging phenomenon.
2. The bulging lithium battery can be discarded directly, because the power capacity is already very small, and there is no power at all after a short circuit.
3. Lithium battery packs generally need to be professionally recycled so as not to cause pollution. If there is no way to deal with them, they should be thrown into the classified recycling bins at the service point of the telecommunication service provider.
Post time: Oct-15-2022