Why does the lithium iron phosphate battery expand?

Why does the lithium iron phosphate battery expand? 1. Overcharging causes the lithium battery to swell. Excessive battery charging will cause the lithium molecules in the positive electrode material of the battery to completely enter the positive electrode material of the battery, and then cause the deformation and collapse of the originally rounded grid of the positive stage. This is the key reason for the reduction of the battery capacity of the lithium iron phosphate battery. With the increase in the total number of lithium batteries on the negative stage, the excessive deposition of lithium molecules causes them to grow into dendritic crystals, which in turn causes the rise of lithium batteries. 2. The bulge caused by the lack of electricity. When the lithium liquid rechargeable battery is charged for the first time, the metal electrode and the lithium battery electrolyte are reflected on the solid and high-efficiency liquid phase page, and a passivation solution layer appears, covering the surface of the metal electrode. The emergence of the passivation solution film can reasonably block the basis of the molecular structure in the lithium battery electrolyte, but Li+ can be placed at will according to the passivation solution layer and adsorbed by the resin, which has the characteristics of a solid electrolyte, so this layer of passivation solution film is called It is SEI. The SEI film is not static. There will be a small amount of transformation during the whole process of battery charging. The most important thing is that some organic compounds will undergo reversible transformation. Excessive charging and discharging of lithium iron phosphate battery packs caused the SEI plastic film to cause reversible damage. After maintaining the SEI, the positive electrode material of the battery, it collapsed, and the bag was picked up. 3. It is the problem of processing and manufacturing standards. The processing and manufacturing standards of lithium iron phosphate battery packs are in a state of packaging. The electrical-grade coatings of the lithium battery packs are uneven, and the processing process is relatively unsmooth. 4. If the lithium iron phosphate battery pack is not used for a long time, swelling will occur. Since the gas is conductive at a certain level, too long charging and discharging time is equivalent to direct contact between the positive and negative electrodes of the battery, resulting in long-term short-circuit failure. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: The difference between 18650 lithium battery and 32650 lithium battery