What are the common problems in the assembly of lithium battery PACK?

Lithium battery PACK assembly and common problems 1. Lithium battery swelling 1. Lithium battery swelling when charging: Lithium battery will expand naturally when charging, but generally not more than 0.1mm, but overcharging will cause electrolyte to decompose. The internal pressure increases and the lithium battery swells. 2. Expansion during cycling: When the battery is cycled, the thickness will increase with the increase in the number of cycles, but it will not increase after more than 50 weeks. Generally, the normal increase is 0.3~0.6mm, and the aluminum shell is more serious. This phenomenon is caused by a normal battery reaction. However, if the thickness of the shell is increased or the internal materials are reduced, the expansion phenomenon can be appropriately reduced. 2. Battery explosion 1. Overcharge explosion: the protection circuit is out of control or the detection cabinet is out of control, causing the charging voltage to be greater than 5V, causing the electrolyte to decompose, a violent reaction occurs inside the battery, the internal pressure of the battery rises rapidly, and the battery explodes. 2. Over-current explosion: The protection circuit is out of control or the detection cabinet is out of control, so that the charging current is too large and the lithium ions are too late to be embedded, and lithium metal is formed on the surface of the pole piece, penetrates the diaphragm, and the positive and negative electrodes are directly short-circuited and cause an explosion. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete it. How to deal with it?