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A kind of formation method of soft pack lithium ion battery

A lithium-ion battery and formation method technology, applied in the field of lithium-ion battery manufacturing, to achieve the effect of ensuring shuttle distance, improving performance, and low energy consumption of formation

Active Publication Date: 2020-04-24
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the problem of how to effectively remove the gas in the battery manufacturing process and promote the formation of a denser and more stable SEI film on the surface of the negative electrode of the battery.

Method used

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  • A kind of formation method of soft pack lithium ion battery
  • A kind of formation method of soft pack lithium ion battery

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Embodiment Construction

[0023] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0024] Such as figure 1 , 2 As shown, the lithium ion battery cathode material of the present application is lithium cobalt oxide, lithium manganate, lithium iron phosphate, lithium nickelate, lithium manganese phosphate, lithium nickel cobalt manganate and / or lithium nickel cobalt aluminate, and lithium ion battery negative electrode The materials are artificial graphite, natural graphite, composite graphite, silicon-based anode and / or lithium titanate. The formation method of the soft-packed lithium-ion battery includes steps 1. Vacuuming once: After the lithium-ion battery is injected, the airbag is inclined upward by 45°, and the normal temperature is infiltrated for 6-12 hours, and more preferably, the normal temperature ...

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Abstract

The invention provides a method for forming a soft-pack lithium-ion battery, which belongs to the technical field of lithium-ion battery manufacturing. It solves the problem of how to effectively remove the gas in it and promote the formation of a denser and more stable SEI film. The formation method of the soft-pack lithium-ion battery includes pre-charging the lithium-ion battery, secondary vacuuming, and low-current charging formation. Before the pre-charging formation, the lithium-ion battery that has been injected with liquid and infiltrated at room temperature is vacuumed once. To the predetermined vacuum degree, and vacuum heat sealing, the front and back sides of the vacuum heat-sealed lithium-ion battery are rolled by a rolling device, soaked at high temperature, cooled to room temperature, and passed between the second vacuuming and the small current formation. The rolling device performs secondary rolling on the front and back of the vacuum heat-sealed lithium-ion battery. The method realizes the formation of a denser and stable SEI film on the surface of the negative electrode of the lithium-ion battery with high energy consumption in a more stable and safe environment, thereby improving the performance of the lithium-ion battery in all aspects.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing and relates to a method for forming a soft-packed lithium ion battery. Background technique [0002] In the production process of lithium-ion batteries, formation is an extremely important process, which fully activates battery active materials. The quality of formation directly affects the subsequent performance of lithium-ion batteries. During formation, a passivation film is formed on the surface of the negative electrode, that is, the solid electrolyte interface film is referred to as SEI film. The quality of the SEI film directly affects the cycle life, stability, self-discharge, safety and other electrochemical properties of the battery. The SEI film formed by different chemical conversion processes is different, and the impact on battery performance is also very different. In particular, the capacity development and cycle life of a battery that is fully formed is highe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 吴波涛朱修锋
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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