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Will polymer lithium batteries explode after being used as bulges? Will polymer lithium battery drums explode? What is the reason for battery bulge? With the advancement of lithium battery technology, the phenomenon of battery swelling during use is becoming less and less common, and it has basically become a probability problem. Lithium battery drums will not explode, but they must be stopped after being used.

Will polymer lithium batteries explode after being used as bulges?

Polymer lithium battery drums may explode and must be stopped from use. Lithium batteries rise up to overcharge during charging, causing changes in the internal chemical properties of the battery and the generation of gas. Generally, polymer soft pack batteries will "bulge" due to overcharging, and steel shell batteries will explode. Be careful when using it, and it is best not to use cheap chargers as they have a significant impact on battery life. It is best not to use the battery with a bulge, as it is very dangerous. It is recommended to replace it.

When there is a bulge problem with polymer lithium batteries, it is best not to continue using such problematic batteries. Because the battery cell expands, when it reaches a certain limit, it may cause an explosion, which is very dangerous. For personal safety, it is best to replace the lithium battery pack as soon as possible when it is found to have bulges.

Reasons for Bulging of Polymer Lithium Batteries

The main reason for the bulging of polymer lithium batteries is the generation of gas inside the lithium-ion cells. Almost all lithium-ion cells show gas generation inside the cells when damaged, while for polymer cells with vacuum flexible packaging, it is manifested as cell bulging. Therefore, cell bulging is also an early warning of cell damage or potential safety issues.

1. The battery cell is overcharged. As mentioned above, when the voltage of the battery cell exceeds 4.2V, a series of chemical reactions will occur inside the cell to produce gas. Long term and repeated slight overcharging will cause the gas inside the cell to gradually accumulate and cause the cell to swell.

2. The battery cell is over discharged. When the battery cell is over discharged (voltage<2.0V) and stored for a long time, due to the electrolytic reaction inside the battery cell, the copper in the anode current collector decomposes, producing gas, which causes gas to be produced inside the battery cell.

3. The gas generated by polymer lithium batteries within the normal working voltage range will undergo several cycles of charging and discharging when the battery is first produced, creating a compound layer on the electrode surface to protect the electrode and no longer participate in the reaction during future charging and discharging processes.

4. When the sealing of the packaging material for polymer lithium batteries is damaged, water molecules in the air entering the interior of the battery can also cause severe swelling inside the battery.

5. Lithium battery cells are stored for a long time when fully charged or overcharged. When the battery cell is fully charged or slightly overcharged, the interior of the cell is not damaged. Due to the very active and highly reducing nature of Li atoms, the Li+on the anode is pulled out to the maximum, and there is a possibility of the presence of highly oxidizing Co3O4, which can slowly react with trace substances in the electrolyte to produce gas. Therefore, when the battery cell is stored for a long time under full or overcharge conditions, some cells will experience slight swelling.

6. The quality of lithium batteries themselves is not up to standard. In order to save costs or due to immature process technology, manufacturers of lithium batteries cannot meet the standards in all aspects, which can cause problems with lithium battery bulges and even serious safety hazards.

The danger of polymer lithium battery bulges

I think everyone may have seen or heard of the swelling of lithium battery packs, and even news incidents of explosions and injuries caused by polymer lithium battery swelling. So why do polymer lithium batteries experience bulges? It turned out to be caused by damage to the internal diaphragm, which generated gas inside the battery.

After the polymer lithium battery is bulging, it will affect its use and cannot be placed in mobile phones or digital cameras. In addition, the presence of gas between the battery plates can also affect the charging and discharging capacity of the battery. Lithium batteries have strict requirements for chargers and cannot be charged casually when the power supply is connected. It is necessary to use a dedicated charger for lithium batteries. If the charger used does not meet the requirements, it can cause the battery to bulge, and in severe cases, safety accidents or even explosions may occur.

So I would like to remind everyone that lithium battery bulges are already a precursor to major problems and are not recommended for further use. Continuing on may result in unimaginable consequences such as short circuits, heating, smoking, and combustion. The correct usage of lithium batteries is that in most cases, only half of the battery is used up before starting to replenish the battery, and in rare cases, a complete discharge and full charge maintenance is carried out. This can greatly reduce the amount of crystallization and significantly slow down the phenomenon of polymer lithium batteries bulging.

As long as it is a lithium battery, there is a risk of explosion, but the probability of this risk is very small. But once it explodes, the larger the capacity of the lithium battery, the greater the power of the explosion. Polymer lithium batteries will produce gas inside after prolonged use, so they will expand. In order to prevent lithium-ion batteries from overheating or even exploding, modern lithium-ion batteries are equipped with many self-protection mechanisms. For the safety of users, it is not recommended to continue using the drum pack lithium battery!

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