Novel making process method of lithium ion battery

Abstract

The invention provides a novel making process method of a lithium ion battery and relates to making of a square lithium ion power battery and an energy storage battery, in particular to a static activation after lithium ion liquid injection-formation-high-temperature aging-secondary liquid injection-formation-sealing process. The novel making process method comprises the following steps: the static step after liquid injection: after battery liquid injection, plugging a liquid injection hole by using a special plug and then storing; the formation step: piercing the plug with a needle, connecting the other end of the needle and a pipeline on formation equipment and pre-charging or charging and discharging the battery in vacuum; the aging step: discharging gas generated inside the battery in manners of piercing the plug with the needle and vacuum pumping; the secondary liquid injection step: supplementing liquid in a manner of piercing the plug with the needle; the secondary formation step: piercing the plug with the needle, connecting the other end of the needle and the pipeline on the formation equipment and charging the battery in the vacuum-pumping process; the sealing step: piercing the sealed plug, pressing the plug under the situation of negative pressure extrusion and then performing laser sealing.

Description

technical field [0001] The invention relates to the field of square lithium ion power and the field of square lithium ion energy storage, and in particular to the process of static activation-formation-high temperature aging-secondary liquid injection-formation-sealing after lithium ion injection. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, high specific capacity, high specific power, and long life. They have become important new energy sources and are widely used in the fields of power batteries and energy storage batteries. Under certain humidity conditions, how to prevent water absorption as much as possible, and minimize environmental modification and humidity control costs has become a bottleneck for many manufacturers; at the same time, how to improve product consistency has become a common research topic for the entire industry. [0003] At present, in the industry, major manufacturers use sealing tape or adhesive tape...

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Problems solved by technology

[0002] Lithium-ion batteries have the characteristics of high voltage, high specific capacity, high specific power, and long life. They have become important new energy sources and are widely used in the fields of power batteries and energy storage batteries. Under certain humidity conditions, how to prevent water absorption as much as possible, and minimize environmental modification and humidity control costs has become a bottleneck for many manufacturers; at the same time, how to improve product consistency has become a common research topic for the entire industry

[0003] At present, in the industry, major manufacturers use sealing tape or adhesive tape to seal the liquid injection hole, so as to protect the inside of the battery from the influence of external environmental moisture. During the formation process, the liquid injection hole is closed or unlocked for formation. In this process, a lot of cost needs to be invested in environmental control. If adhesive tape is used for sealing, the adhesive tape is easy to fall off, and due to poor sealing, it is easy to cause moisture to enter the inside of the battery. If sealing is used, a large amount of internal gas will be generated The gas cannot be discharged in time, and it is stored inside the battery, causing the case to expand or have an impact on the battery

[0004] In the current industry, before sealing, it is necessary to pull out the sealing ring or tear off the adhesive tape, insert the sealing rubber pad, then wash the electrolyte on the surface, and then dry it to prevent the shell from being damaged during the laser welding process. There is electrolyte on the surface, which causes laser sealing to explode, or the surface of the aluminum shell is corroded by electrolyte, which causes poor appearance. This requires a lot of waste of manpower, material resources, equipment and electrical resources.

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