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Why does lithium iron phosphate battery expand?
Upload Time:
2023-12-16
Why does lithium iron phosphate battery expand?1. Overcharge leads to bulging of lithium battery.2. Bulge caused by power loss.3. It is a question of manufacturing standards......
1. Overcharge leads to bulging of lithium battery.
Excessive battery charging will cause the lithium molecules in the battery positive material to completely enter the battery positive material, resulting in the deformation and collapse of the original round square of the positive stage, which is the key reason for the reduction of the battery capacity of lithium iron phosphate battery. With the increase of the total number of lithium-ion batteries on the negative stage, the excessive deposition of lithium molecules makes them grow into tree structure crystals, which makes lithium batteries rise.
2. Bulge caused by power loss.
When the lithium liquid rechargeable battery is charged for the first time, the metal electrode and the lithium battery electrolyte react on the solid high performance liquid phase page to produce a passivation treatment layer, which is covered on the surface of the metal electrode.
The generated passivation treatment film can reasonably block the basis of molecular structure in lithium battery electrolyte, but Li + can be arbitrarily placed and adsorbed by resin according to the passivation treatment layer, which has the characteristics of solid electrolyte. Therefore, this passivation treatment film is called SEI. SEI film is not invariable. There will be a small amount of transformation in the whole process of battery charging, mainly reversible transformation of some organic compounds.
Excessive charge and discharge of lithium iron phosphate battery pack caused reversible ring breaking of SEI plastic film. After maintaining the battery cathode material SEI, it collapsed, resulting in unpacking.
3. Manufacturing standards
The production and manufacturing level of lithium iron phosphate battery pack has unpacking status. The electric grade coating of lithium battery pack is uneven and the production process is not smooth.
4. The lithium iron phosphate battery pack will bulge even if it is not used for a long time.
Because the gas is conductive at a certain level, the charging and discharging time is too long, which is equivalent to the direct contact between the positive and negative electrodes of the battery, resulting in long-term short-circuit fault.
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