Why would a lithium-ion battery control moisture

In the process of manufacturing lithium-ion batteries, there are many things that must be strictly controlled. One is dust, the other is metal particles, and the third is water.

Water has a huge impact on lithium-ion batteries and will mainly cause the following adverse consequences:

If the water content is too high, the electrolyte reacts with the water to produce trace harmful gas, which has adverse effects on the injection chamber environment; This will also affect the quality of the electrolyte itself, making the battery poor performance, and will also cause the battery to rust.

Water reacts with a component in the electrolyte to produce harmful gases. When there is enough water, the pressure inside the battery becomes larger, causing the battery to deform. If it is a cell phone battery, it appears as a drum shell; When the internal pressure is high, the battery is dangerous, the burst causes the electrolyte to spatter, and the battery fragment can easily hurt.

The internal moisture of the battery is too high; Loss of the active components of the electrolyte, but also the loss of lithium ions, so that the lithium ion in the battery negative electrode chemical reaction. When lithium ion is consumed, the battery's energy is reduced.

Using a 26650 battery to power the drill, it could have been used for 1 hour after being fully charged. Because the battery has water inside, it can only use 50 minutes.

When the internal water of the battery is large, the electrolytic fluid inside the battery reacts with water. The product will be gas and hydrofluoric acid(hydrofluoric acid is a highly corrosive acid that causes the metal parts inside the battery to corrode. In turn, the battery eventually leaks. If the battery leaks, the performance of the battery will rapidly decline, and the electrolyte will also corrode the user's machine, eventually causing more dangerous failure.

What is the source of water in the battery?

For the water in the battery, its source comes mainly from the material, of course, but also related to the environment.

Positive electrode: If the positive electrode is a nanometer material, this nanometer material is very absorbent and easily absorbs water in the surrounding air.

Negative Tablets: Negative Tablets have relatively low water absorption than positive Tablets. Of course, in the absence of humidity control, the amount of water absorption from ambient air is also quite optimistic.

Membrane paper: Membrane paper is also a porous plastic film, its water absorption is also very large.

Electrolytes: Electrolytes are very afraid of someone. They are also very easy to absorb water. They react with water until all electrolyte materials are reflected. That is to say, their ability to drink water is endless until they die.

Other metal parts:

Although the metal parts themselves have limited water absorption, the metal parts are afraid of water because the presence of water will cause them to rust or corrode.

The moisture content of the material is the main source of water in the battery. Of course, the higher the humidity in the environment, the easier the battery material absorbs water.

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