Encapsulation type rechargeable lithium ion button battery

Abstract

The invention discloses an encapsulation type rechargeable lithium ion button battery, and is applied to the technical field of lithium ion batteries. The encapsulation type rechargeable lithium ion button battery comprises a sealing shell, electrolyte and an electrode. The electrolyte is arranged in the sealing shell, the electrode is arranged in the electrolyte and is a spirally wound electrode, and an insulating and ion-impermeable film (12) is arranged on the outermost ring of the spirally wound electrode. The encapsulation type rechargeable lithium ion button battery has the advantages of compact structure, stability in use and long service life.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a rubber-encapsulated rechargeable lithium ion button battery. Background technique [0002] Rechargeable lithium-ion batteries and lithium pouch batteries are widely used in sustainable electronic devices such as mobile phones and earphones. In particularly small devices such as hearing aids, volumetric energy density is a key consideration. Due to the requirement for the volume of rechargeable lithium-ion batteries, in order to reduce the volume of the battery while ensuring the application efficiency of the battery, spirally wound electrodes are often used, but in the process of increasing the energy density of the battery volume, there are new For example, in the Chinese patent application. and the US patent (US,, B), the wound electrode is directly used, and the outermost ring is wrapped by a pole piece or a diaphragm after winding and partially pasted with tape fixed. Since the b...

AI Technical Summary

Problems solved by technology

After the charging is stopped, the electrons provided by the deposited lithium will cause the oxide layer on the surface of the steel shell to be reduced and destroyed

Especially at the welding part of the tab and the steel shell, although there is no direct contact with the electrode roll, there is bimetal due to welding, and the potential of the tab is higher, which is more likely to attract electrons provided by lithium and cause the original oxide layer to be destroyed. reduction

After losing the protection of the oxide layer, the metal will be corroded when exposed to the electrolyte, and a new oxide film will be formed. Repeat this many times, the oxide layer at the tab will become thicker and the metal layer will become thinner, and finally lead to Open circuit, the battery cycle life is short; moreover, in order to ensure the sealing of the battery, the structure is made too complicated, which increases the production cost of the battery and the complexity of the process

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