Why is the battery do not use a bulk bag in normal use or long time?

　　Author ：Iflowpower – Portable Power Station Supplier

There are two phenomena in the process of charge and discharge: one. Excessive charging caused by overcharge can result in all the lithium atoms in the positive electrode material to enter the negative electrode material, causing the positive polarized grid to collapse, which is also a tight source of the lithium-ion battery. During this process, the lithium ions of the negative electrode are increasing, and the over-accumulation allows the lithium atom to be crystallized, so that the battery is bulging.

two. In the first charge and discharge process of the liquid lithium-ion battery, the electrode material is reacted on the solid-liquid phase interface during the first charge and discharge of the liquid lithium ion battery, and forms a passivation layer that is touched by the surface of the electrode material. The formed passivation layer film can effectively prevent the passage of the electrolyte molecule, but Li + can be freely embedded and disengaged by the passivation layer, and has the characteristics of the solid electrolyte, so this layer of passivation film is referred to as a solid electrolyte interface mask.

(SolideElectrolyteinterface), referred to as SEI. The SEI film will protect the negative electrode material, so that the material structure is not easy to collapse, and the cycle life of the electrode material can be added. The SEI film is not a constant, there will be a little change in the charge and discharge process, and it is necessary to reverse changes in some organic matter.

After the battery is excessively discharged, the SEI film occurs reversible to break the ring, and the SEI destruction of the negative electrode material makes the negative electrode material collapse, thereby forming a bulk phenomenon.