Can the lithium iron phosphate battery bulge deflate?

Introduction Can the lithium iron phosphate battery bulge be deflated? Because lithium batteries are vacuum sealed when packaged. The rise of lithium batteries is due to the poor level of manufacturing of lithium polymer batteries.

Can the lithium iron phosphate battery bulge deflate?

Do not deflate it. Because lithium batteries are vacuum sealed when packaged. Lithium battery bulges are caused by problems with the manufacturing level of lithium polymer batteries, uneven electrode coatings and difficult production processes or problems with overcharging and overdischarging during use. These two factors will cause a violent short circuit-like reaction inside the battery during use, generating a large amount of heat, which in turn will cause the electrolyte to decompose and vaporize, causing a swelling of the battery.

Lithium battery swelling is caused by problems with the manufacturing level of lithium polymer batteries, uneven electrode coatings and difficult production processes or overcharging problems and excessive discharge during use.These two factors will cause a violent short circuit-like reaction inside the battery during use, generating a large amount of heat, which in turn will cause the electrolyte to decompose and vaporize, causing a swelling of the battery.

Detailed information:

There are two phenomena of bulging during the charging and discharging process:

1. The bulging caused by overcharging will cause the material to the positive electrode overload. All of the lithium atoms in the battery penetrated the material of the negative electrode, causing the initially full grid of the positive electrode to deform and collapse. This is also one of the main reasons for the decline in power of lithium batteries. During this process, there are more and more lithium ions in the cell.negative ctrode. Excessive buildup causes lithium atoms to turn into strain crystals, causing the 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 the electrolyte react at the solid- liquid 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 detached through the passivation layer, which has the characteristics of a solid electrolyte. Therefore, this passivation film is called "solid electrolyte interface" "membrane". " (solid electrolyte interface), called SEI.

(Images/Text/Photos: Q&A) @2019

Why do lithium iron phosphate batteries have a medicinal smell

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One to two years.

Lithium iron phosphate batteries will enter a dormant period if left for one to two years without use, and the battery will also swell, so it cannot continue to use this battery.

Lithium iron phosphate battery is a lithium ion battery that uses lithium iron phosphate as the positive electrode material and carbon as the negative electrode material. The nominal cell voltage is 3.2 V and the load cut-off. the off voltage is 3.6V~3.65V.

Why is the lithium iron phosphate battery soft?

The battery is leaking.

1. Lithium iron phosphate battery leakingThere will be a slightly pungent odor, similar to a medicinal odor.

2. Lithium iron phosphate battery leakage is caused by overcharging and overdischarging the battery during use. Battery performancewhich leaks are very bad. Using a leaking battery for a long time is harmful. to the battery It is also harmful to the body and must be replaced with a new lithium iron phosphate battery.

Softness of the Pacific Automotive Network lithium iron phosphate battery is caused by overcharging. The bulge caused by the overcharge will cause all the lithium atoms in the positive electrode material to flow into the negative electrode. material, causing the positive electrode to deform and collapse. The original full grid is also one of the main reasons for the decline in lithium battery power. 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 battery to swell.

2. The bulging SEI film caused by a discharge excessive will protect the negative electrode material, making the material structure less likely to collapse and increasing the life of the electrode material. The SEI film is not static and will undergo slight changes during the charging and discharging process, mainly due to reversible changes in some organic materials. Overdischarge of lithium iron phosphate batteries causes reversible damage to the SEI film. Once the SEI that protects the negative electrode material is damaged, the negative electrode material will collapse, resulting in a bulging phenomenon.

3. Issues related to the manufacturing level of lithium iron phosphate batteries. The coating of the electrodes is uneven and the production process is relatively rough.

Lithium iron phosphate battery rarely leaks after bulging. It can be said that there is practically no leakage. The main cause of the bulgement is battery overload. It must be said that the quality of current lithium batteries is very good. They will not leak after being inflated. Nowadays, batteries are solid-state.

Reasons for leakage of flexible packaging of lithium iron phosphate batteries: a) Aging of the sealant causes cracks in the seal. b) The lithium battery is seriously overcharged and different types of lithium batteries are mixed; , resulting in poor battery gas recombination efficiency; c) Acid splashes during acid filling, causing false leaks.

d) Usually, the output current is too large, the continuous discharge time is too long, and the temperature of the soft package lithium iron phosphate battery increases. There are also batteries that use low current for a long time and may leak.

e) There is no acid in thes dry batteries. Typically, the batteries are zinc chloride or liquid ammonium chloride. Alkaline batteries are made of liquid potassium hydroxide.

(Images/Text/Photos: Pacific Automotive Network Calling the Beast Q&A)

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