What is the real reason for the bulging of lithium batteries?

The expansion of lithium batteries is important for two reasons. One is a problem made by the manufacturer. The processing environment is harsh and the processing equipment is outdated. All of these may make the lithium battery pack bulge in use, or even more dangerous. Another reason lies in the users themselves. If users use lithium battery products improperly, such as overcharge or overdischarge, or continuous use in extremely harsh environments, it will also cause the lithium battery to bulge. In addition to the above two important reasons, there is another less common reason. That is, the battery is not used for a long time, and then it is not well preserved. When it is exposed to the air for a long time without using it, it is fully charged. Since air is conductive to a certain extent, making the air too long is equivalent to direct contact between the positive and negative electrodes of the battery, which will cause a long-term short circuit. The important principle behind the expansion of the lithium battery is that a violent reaction similar to a short circuit occurs inside the battery, and a large amount of heat occurs, which causes the electrolyte to decompose and vaporize, which causes the lithium battery to expand. When the lithium battery pack has a swelling problem, it is best not to continue to use the problematic battery. Due to the expansion of the battery, when the expansion reaches a certain limit, it may cause an explosion, which is very dangerous. 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: Why do electric vehicles use lithium batteries as the core of power?