Negative pressure formation method of lithium ion battery and battery thereof

Abstract

The invention relates to a negative pressure formation method of a lithium ion battery and the battery thereof. The negative pressure formation method comprises the following steps: sticking a hydrophobic permeable membrane on a liquid filling hole of the battery, adopting the negative pressure formation technology for carrying out formation on the battery, controlling the battery internal pressure in the range of vacuum degree of minus 0.01MPa-minus 0.1MPa, charging in the current range of 0.01C-1.5C, and carrying out the formation through the time control of the charging volume of the lithium ion battery. The battery formed by the method has high capacity playing of active substances, small internal resistance, small probability of shell bulging, long cycle life and long shelf life and is not affected by environmental humidity. Simultaneously, the method has the advantages of short formation time, high utilization rate of equipment, small energy consumption and small electrolyte loss, and is the high-efficient formation method which is conductive to environmental protection and suitable for mass production of the lithium ion batteries.

Description

Technical field: [0001] The invention relates to a battery formation method and its application, in particular to a novel negative pressure formation method suitable for lithium ion batteries and the battery thereof. Background technique: [0002] The wide application of modern electronic products in daily life has greatly increased the market demand for lithium-ion batteries, which has spawned many lithium-ion battery manufacturers. However, the current industrial production process of lithium-ion batteries is prone to quality problems such as bulging shells, large dispersion of battery capacity, and poor battery appearance. An important reason for the above problems is that the charging process of the first chemical formation to form a solid electrolyte interphase film (SEI) produces a negative electrode polarization phenomenon, which in turn causes the electrochemical reduction of the solvent to generate gas. The existence of gas will inevitably lead to the swelling of t...

AI Technical Summary

Problems solved by technology

If the formation time is rigidly shortened, it is easy to cause problems such as low capacity of lithium-ion batteries and bulging shells.

It can be seen that the shelf time currently adopted to solve the gas generation is the most fundamental reason for the long battery manufacturing process time, forming a problem that has not been well resolved in the industry.

At the same time, there is overflow and volatilization of the electrolyte in the opening formation process, resulting in corrosion of the battery appearance and deterioration of the workshop environment

In order to reduce the impact of moisture on the performance of lithium-ion batteries, the opening formation process generally needs to be carried out in an anhydrous environment. Large-scale enterprises generally solve this problem by building a drying room, which often results in an increase in fixed investment.

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