A cylindrical lithium-ion battery cell baking process

Abstract

The invention relates to a baking process for cylindrical lithium-ion battery cells, which uses a graded baking equipment, the graded baking equipment includes an oven, a primary baking mechanism, a secondary baking mechanism, a collection box and a roller Conveyor, the specific process when using the above-mentioned grading baking equipment to bake the battery cells is as follows: battery cell placement, vacuuming, nitrogen filling, first-level baking, second-level baking and transfer, the first-level baking mechanism includes The first-level support frame, the first connection frame, the second connection frame, the buffer piece and the partition frame, and the second-level baking mechanism include the second support frame, the fixed plate and the expansion plate. The invention adopts a graded baking method to bake the battery cells, and separates and places the battery cells according to the degree of drying, which can solve the problem that the battery cells with a large moisture content and the battery cells with a small moisture content are mixed and placed, resulting in baking. The problem of low drying efficiency, and the position of the battery cells must be adjusted during the baking process to avoid uneven baking.

Description

technical field [0001] The invention relates to the technical field of battery production, in particular to a cylindrical lithium-ion battery cell baking process. Background technique [0002] In the production process of lithium-ion batteries, after the positive and negative electrode sheets are rolled and put into the battery box, the lithium battery cell electrode group must be baked and dried. As we all know, moisture has the greatest impact on the performance of lithium batteries. It is necessary to remove the moisture inside lithium-ion battery cells in the assembly workshop before liquid injection, so as not to affect the quality of lithium batteries. [0003] At present, the common baking method is that the battery cell is placed on the inner frame of the baking oven, and the baking and drying process is carried out by filling inert gas. In the process of using an oven to bake battery cells, there are some problems: [0004] (1) When baking battery cells with diffe...

AI Technical Summary

Problems solved by technology

[0004] (1) When baking battery cells with different water contents in an oven, the battery cells with low water content tend to complete the drying work before the battery cells with high water content. If the battery cells are not dried in time The battery cell is separated from other battery cells, and the temperature of the dry battery cell will rise further after absorbing heat, resulting in that the drying speed of the battery cell still containing moisture cannot be increased, and the drying time is prolonged;

[0005] (2) The battery cells need to be placed on a tray or jig for baking, so it is more difficult to dry the part covered by the tray or jig, so it is easy to appear that part of the same battery cell is dried while the other part is not. , which affects the overall quality of the battery cell, and there are potential safety hazards in the subsequent use process

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