Seal method for lithium ion cell

Abstract

The disclosed seal method for improving tightness and security includes a metal tank body and an upper cover. A hole for injecting liquid is formed on the upper cover. One end of provided sealing element is connected to an operating rod, which passes through the injecting hole. Part of operating rod is extended out of the upper cover. The upper cover welded onto the tank body is combined as an integrated body. Electrolyte is injected into the tank body through the injecting hole. A sealing element is inserted and plugged onto the said injecting hole, and the sealing element welded onto the upper cover is combined as an integrated body. Then, the operating rod is removed. The sealing element possesses a main body part, whose shape and size are coincided with shape and size of injecting hole, and a head part, which is slightly larger than injecting hole. The sealing element and injection hole can form screw thread couple further, or form explosion proof set, or positive terminal.

Description

【Technical field】 [0001] The invention relates to a lithium ion battery packaging method, in particular to a battery sealing method using liquid electrolyte. 【Background technique】 [0002] In recent years, the functions of computers, communication electronic products, and consumer electronic products have become more and more powerful, and their external dimensions have become smaller and lighter, so battery products with high capacity and small size are popular. Lithium-ion batteries, in particular, have the characteristics of large capacity, high energy density, and high voltage, and their market share in mobile phones, notebook computers, digital cameras and other products continues to rise. [0003] Lithium-ion batteries are based on lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ) or lithium manganese oxide (LiMn 2 o 4 ) and the like are positive electrode active materials, and lithium metal, lithium alloys or carbon materials are used as negative e...

AI Technical Summary

Problems solved by technology

[0013] In order to overcome the disadvantages of poor airtightness and poor welding strength in the prior art due to poor sealing of the electrolyte injection hole, the purpose of the present invention is to provide a battery with good airtightness, which can prevent water vapor from entering the interior of the battery, A lithium-ion battery sealing method that can also avoid electrolyte leakage, another object of the present invention is to provide a lithium-ion battery sealing method with firm structure, high strength and good safety

Images