Preparation method of electrode plate for lithium-ion battery

Abstract

The invention discloses a preparation method of an electrode plate for a lithium-ion battery. The method comprises the steps as follows: a foamed gummed paper is attached to a tab welding region of foil; gum in the foamed gummed paper contains a foaming agent; the foil is coated, so that an active material completely covers the foil and the foamed gummed paper; the coated foil is fed into an oven for segmental baking; the oven comprises a plurality of segments of ovens; the last segment of oven is a high-temperature oven; the temperature of the high-temperature oven is the highest and higher than the foaming temperature of the foaming agent in the foamed gummed paper; the foamed gummed paper of which the viscosity is reduced to crimp after being baked at a high temperature is cleared away by a hairbrush after the foil is taken out of the oven, so that blank foil is exposed in the tab region; and baking, rolling, slitting and tab welding are carried out on the electrode plate, so that fabrication of the electrode plate is finished. The foamed gummed paper which can be foamed at the high temperature to cause a viscosity failure is attached to the tab welding region of the electrode plate; and the affinity of the foaming agent added to the gum layer on an adhesive is much greater than that of the foil on the adhesive, so that the foil is prevented from being adhered to the adhesive.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of high energy density lithium battery pole pieces. Background technique [0002] As communication and digital products become lighter and thinner, and the requirements for equipment standby time are getting higher and higher, higher requirements are put forward for the energy density, cycle life, and internal resistance of batteries. At present, when the gram capacity of the positive and negative active material materials is exerted to the extreme, further increasing the capacity of the battery cell has become a technical bottleneck in the field of lithium batteries. [0003] Such as figure 1 As shown, in the production process of the battery pole piece, whether it is the positive pole piece A or the negative pole piece B, there will be a blank area C not coated with active material at the end of the pole piece, which i...

AI Technical Summary

Problems solved by technology

However, the preparation process of the pole plate is to attach high-temperature glue on the pole piece. Since the adhesive force between the glue paper and the empty foil always exists, in the process of removing the glue paper, there is an inevitable risk of tearing the foil when tearing the glue paper , and after the glue is removed, there may still be a situation where the adhesive layer adheres to the empty foil. When welding the tabs, it is easy to cause false welding of the tabs, causing the tabs to fall off from the pole piece, thus affecting the performance of the battery cell.

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