What are the reasons for the bulging of polymer lithium batteries?

Will polymer lithium battery explode after swollen use? The swollen polymer lithium battery may explode, so you must stop using it. Lithium batteries are overcharged during charging. The internal chemical characteristics of the batteries change and gas is caused. Generally, polymer soft pack batteries will swell if overcharged, and they will explode if they are steel shell batteries. Be careful when using it. It is best not to use cheap chargers, which have a great impact on battery life. The bulging battery is best not to be used again, it is very dangerous and it is recommended to replace it. The reason for the bulging of the polymer lithium battery The important reason for the bulging of the polymer lithium battery is the gas inside the lithium ion battery. Almost all the lithium ion batteries, the first manifestation when they are damaged is the gas inside the battery, and about the vacuum Polymer batteries with flexible packaging are manifested as swelling of the battery, so the swelling of the battery is also an early warning of damage to the battery or possible safety problems. 1. The battery cell is overcharged. As mentioned above, when the battery cell voltage exceeds 4.2V, there should be a series of chemical reactions and gas will appear inside. If there are many times of slight overcharge for a long time, the gas inside the battery cell Gradually gather and swell the battery core. 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 is decomposed, and gas appears inside the battery cell. gas. 3. When the polymer lithium battery cell is in the normal working voltage range, we will carry out several cycles of charging and discharging when the battery cell is just made, so that a layer of compound is formed on the surface of the electrode to protect the pole piece. , And will no longer participate in the reaction in the future charge and discharge process. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the differences between fuel power batteries and lithium batteries?