The need for moisture control in lithium-ion batteries

In Lithium ion batteries Manufacturing process, there are a lot of things that must be strictly controlled, it is dust, the second is the metal particles, three is the moisture.

Moisture of lithium ion battery Had a huge impact, the main causes the following consequences:

If the moisture content is exorbitant, electrolyte and water reaction, trace harmful gas generated, have a bad effect on liquid injection room environment;It will also affect the quality of the electrolyte itself, makes the battery performance is bad, will cause the battery rivets rust.

A compound in water and electrolyte reaction, generate harmful gas, when the water enough battery internal pressure is bigger, so as to cause the battery stress deformation.If the cell phone battery, it is characterized by drum shell;When the internal pressure in the high, battery is in danger, burst electrolyte splash, pieces of battery is also easy to hurt.

Battery internal moisture content is too high;Loss of the active components of electrolyte, and loss of lithium ion, lithium ion in battery cathode slice of irreversible chemical reaction.Consumes lithium ion battery energy is reduced.

with26650 batteryTo power a drill, full of electricity that could be used for 1 hour after, because there is the moisture inside the battery can only be used for 50 minutes.

When the battery internal moisture more reaction inside the battery electrolyte and water, the product will be gas and hydrofluoric acid (hf acid is a kind of strong corrosive acid, it can make the battery internal corrosion of metal parts, and make a battery leakage in the end.If the battery leakage, the performance of the battery will drop rapidly, and the electrolyte to corrosion of the user's machine, and cause more dangerous failure.

Water source in the battery?

For the moisture in the battery, its source is mainly to the material, of course also relating to the environment.

Positive plate: positive plate if you are using nanometer materials, the nanometer material has strong water absorption, easy to absorb moisture in the air around.

The cathode piece: negative than positive plate, water imbibition relative low point, of course, in the absence of control humidity environment, the water from ambient air quantity is also very optimistic.

Diaphragm paper: diaphragm paper is also a kind of porous plastic film, the water is very big.

Electrolyte, electrolyte is a substance is very afraid of who, it is also very easy to water, it will launch a reaction, and water until all reflect the electrolyte material of complete, that is, its ability to drink water is endless, until they die.

Other metal parts:

Although the metal parts for the absorption of moisture is limited, but the metal part of water is very afraid, because of the existence of water will make it rust or corrosion.

Moisture content of materials is the main source of water in the battery, of course, the greater the environment humidity, battery materials, the more easily absorb the moisture.

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