The reason for the expansion of mobile phone lithium battery is

Lithium battery bulging generally has the following reasons:

1. Over-discharge;

2, micro short circuit, that is, the diaphragm is damaged, causing partial contact between the positive and negative electrodes inside the battery;

3. Continuous floating charge at high temperature causes side reaction of electrolyte, and large rate charge and discharge at high temperature. This problem does not occur in civilian use;

4, low-temperature charging, in fact, is also caused by lithium piercing the diaphragm caused by micro-short circuit;

5. The aluminum plastic film of the outer packaging is corroded;

6, vacuum is not clean, or used in high altitude environment, mobile phone batteries are soft packaging, this has a great impact.