Preparation method of nickel tab with heat-resistant insulating coating

Abstract

The invention discloses a preparation method of a nickel tab with a heat-resistant insulating coating. The preparation method comprises the steps of (a) uniformly coating two sides of the nickel tab (1) with heat-resistant insulating organic slurry through a coating head, wherein the width of the nickel tab is greater than that of tab glue (3), and quickly drying the nickel tab by using electric hot air after coating to form the heat-resistant insulating coating (2); and (b) pressing the tab glue (3) on the nickel tab (1) coated with the heat-resistant insulating coating (2) in a hot pressingmanner. The coating is high in heat-resistant temperature, cannot be molten during top sealing, is made of an insulating material, and cannot conduct electrons and ions, so that the nickel tab and analuminum layer can be well insulated and isolated after top sealing. The control precision of a top sealing procedure can be properly reduced, and a top sealing processing window is widened. A batterymanufactured by adopting the nickel tab does not have the problem of corrosion at the nickel tab in the long-term use and storage process.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a nickel tab with a heat-resistant insulating coating. Background technique [0002] In the field of consumer electronics, soft pack batteries have occupied the absolute mainstream. With the continuous improvement of energy density requirements, the proportion of pouch batteries in the field of power and energy storage is also increasing year by year. However, there is a fatal problem in the pouch battery, that is, the packaging material is prone to electrochemical corrosion, resulting in liquid leakage, which leads to battery failure. Most corrosion occurs slowly and cannot be detected effectively at first, which greatly reduces its reliability in long-term use. [0003] The outer packaging material of the pouch battery is aluminum-plastic film, which consists of three layers, including [0004] (1) The nylon layer, on the outermost side, ...

AI Technical Summary

Problems solved by technology

For the nickel tab of the top seal part, once the process is not well controlled, the contact between the nickel tab and the aluminum layer is prone to occur. Because of the existence of potential difference, electrochemical corrosion is prone to occur, causing damage to the aluminum layer, and external moisture enters the interior of the battery, causing bulging, Leakage and other serious problems

Even if the top sealing process is very strictly controlled, there will still be a certain proportion of nickel-aluminum contact problems. Some initial contact is very small, and it will continue to increase during use or storage, bringing great risks.

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