Pacific Automotive Network can repair lithium iron phosphate battery bulges. Overcharging lithium iron phosphate batteries will cause all of the lithium atoms from the positive electrode material to leak into the negative electrode material, resulting in the grid being initially full of it. the positive electrode. The grid deforms and collapses, which is also an important reason for the power decline of lithium iron phosphate batteries. During this process, there are more and more lithium ions in the negative electrode. Excessive accumulation causes lithium atoms to turn into strain crystals, causing the lithium iron phosphate battery to swell.
1. Bulging of lithium iron phosphate batteries caused by overcharging will cause all lithium atoms from the positive electrode material to move into the negative electrode material, causing theformation of the original complete grid of the positive electrode. and collapse. This is also the case for phosphoric acid, an important reason for the decline in power of iron-lithium batteries. During this process, there are more and more lithium ions in the negative electrode. Excessive accumulation causes lithium atoms to turn into strain crystals, causing the lithium iron phosphate battery to swell.
2. Bulge caused by over-discharge During the first charging and discharging process of the liquid lithium-ion battery, the electrode material and electrolyte react at the solid-liquid interface to form a passivation coating layer . the surface of the electrode material. The formed passivation layer can effectively prevent the passage of electrolyte molecules, but Li+ can be freely inserted and extracted through the passivation layer, which has the characteristics ofa solid electrolyte. This is why this passivation film is called SEI.
SEI film is not static and will undergo slight changes during the charging and discharging process. The important thing is that some organic materials will undergo reversible changes. Excessive discharge of the lithium iron phosphate battery causes reversible damage to the SEI film. Damage to the SEI that protects the negative electrode material causes the negative electrode material to collapse, leading to swelling phenomenon in the lithium iron phosphate battery.
3. Manufacturing level issues Lithium iron phosphate battery swelling may be caused by the manufacturing level of the lithium iron phosphate battery. The electrode coating is uneven and the production process is relatively rough.
4. The lithium iron phosphate battery will swell if not used for a long time, car air is conductive to a certain extent. Therefore, if left too long, it is equivalent. to the positive and negative electrodes of the battery being directly connected, creating a chronic short circuit.
As ternary lithium-ion battery technology continues to mature, safety gaps have been filled and the advantages of high energy density can be fully exploited. As for lithium iron phosphate batteries, apart from their great handling safety, they do not have good parameters.
(Images/Text/Photos: Pacific Automotive Network Q&A)
1. What should you do if your cell phone battery is swollen and what are the consequences? , how to deal with it
Mobile phone batteries are high-energy lithium batteries. If swelling or swelling occurs, please do not continue to use itto avoid dangerous situations. Please replace the battery in time.
Cell phone batteries typically have a lifespan of one to two years, and problems can occur when the battery leaves the factory. the quality is not up to par, caused by imperfect structure.
The metallic properties of lithium are intended to cause an oxidation reaction when the bulge is exposed to oxygen in the air. Oxidation will cause a risk of explosion.
In fact, when charging and discharging lithium batteries, a chemical reaction occurs. When charging, the lithium atom in the positive electrode of the lithium-ion battery will lose an electron and. become negative. The lithium ions swim to the negative electrode through the alkaline solution, then are stored and discharged. Rather, a lithium ion is released and reduced to lithium atoms. It is not sustainabledue to internal consumption.
There is a layer of diaphragm paper inside the battery. A good diaphragm paper can automatically close the pores when the battery temperature is too high, preventing the passage of lithium ions and preventing damage. But when the quality of the separator paper is not up to standard, it can cause damage.
2. What to do if the cell phone battery is swollen?
If the battery is broken, simply replace it.
Nowadays, almost all mobile phones and other electronic devices use lithium-ion batteries, because lithium-ion batteries are small in size, large in capacity and last Longer.
Generally, the utilization rate of lithium-ion batteries is 2,500 times charged and discharged, then the capacity and storage capacity will gradually decrease.
Use it normalis lying. Once it is fully charged, wait for it to charge for a while before using it. When charging, the battery is low and the radiation is high. It is best not to use the cell phone. This affects battery life. Remember, don't use your phone until it's turned on.
This will damage battery life. Wait until it is full before using it.
Generally, a cell phone battery lasts 3.4 years and can still be used normally. This means the battery is better and you take good care of it. Using power saving mode or using good optimization software can significantly improve your standby time.