Method for baking lithium ion battery or battery pole piece in tunnel mode

Abstract

A method for baking a lithium ion battery or a battery pole piece in a tunnel mode at least includes the step of pulsation vacuum preheating, wherein the temperature in a preheating box is made to rise to first preset temperature within first preset time, a part of water in the preheating box is drained through a vacuumizing method within second preset time, and the preheating box is refilled with dry air; the temperature in the preheating box is made to rise to second preset temperature within third preset time, a part of water in the preheating box is drained through the vacuumizing method within fourth preset time, and the preheating box is refilled with dry air; the step is circulated in this way until the temperature of the lithium ion battery or the battery pole piece in the preheating box reaches technological design temperature. Compared with the mode of single temperature rise in the preheating box in the prior art, most water in the lithium ion battery or the battery pole piece can be removed in the preheating stage, the water removal effect is excellent, and the water removal time of a speed bar production line can be greatly shortened.

Description

technical field [0001] The invention relates to a method for tunnel-type baking of lithium-ion batteries or battery pole pieces. Background technique [0002] At present, the manufacture of lithium-ion battery pole pieces or lithium-ion batteries requires deep drying of lithium-ion battery pole pieces or lithium-ion batteries. The existing deep drying equipment adopts a single-box baking process. The most common The baking process is in a vacuum oven, first put the baked lithium battery electrode into the vacuum oven, and then heat the box, when the temperature in the box reaches the requirement, under the condition of heat preservation, put The box is vacuumed to remove moisture. When the moisture of the battery pole piece meets the requirements, the baked lithium battery electrodes or batteries in the box are naturally cooled or forced to cool, so that the baked lithium battery electrodes or batteries After the temperature drops to a certain level (generally ...

AI Technical Summary

Problems solved by technology

For example, Chinese patent document CN104134777A discloses a method for tunnel-type baking of lithium-ion batteries or battery pole pieces. The method of tunnel-type baking of lithium-ion batteries or battery pole pieces adopts a continuously working pulsating vacuum preheating step, high vacuum Segmented water removal steps and rapid cooling steps can greatly shorten the baking time, and truly realize the continuous operation of the baking and coating line of lithium-ion batteries or battery pole pieces, but in actual use, the baking method needs to be further improved. improve

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