Rapid drying dehydration method for polymer lithium ion battery before liquid injection

Abstract

The invention discloses a rapid drying dehydration method for a polymer lithium ion battery before liquid injection. The method comprises the following steps: an excess water pre-pumping stage, a rapid heating and preheating stage of the battery, a constant-temperature boiling water evaporation stage of a baking oven and an alternate replacement stage of dry gas. In the excess water pre-pumping stage, original water inside the baking oven is pumped firstly; in the rapid heating and preheating stage of the battery, the core temperature of the battery rapidly reaches a water evaporation temperature; in the constant-temperature boiling water evaporation stage of the baking oven, the water inside the core of the battery boils and is saturated; and in the alternate replacement stage of dry gas,the water is pumped, the dry gas is replaced, and the concentration of the water is continuously reduced and neutralized until the water meets production requirements. According to the method, the waste of energy sources can be obviously reduced, the idle time of baking is shortened, the quantity of used baking oven equipment certainly will be reduced, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of battery preparation, and in particular relates to a method for quickly drying and removing water before liquid injection of a polymer lithium ion battery. Background technique [0002] Current polymer lithium-ion batteries need to be baked to remove water before filling. Vacuum baking and intermittent high-purity gas (nitrogen or argon) are widely used to break the vacuum and then vacuum again to take away the moisture from the baking. The whole baking time is very long, generally takes about 16 hours to 24 hours . Therefore, in order to achieve the drying effect before the liquid injection of the polymer lithium-ion battery, it is often necessary to waste a lot of energy and time. In fact, the entire process of drying and removing water before polymer lithium-ion battery injection does not take into account the temperature consistency of the oven, the moisture concentration inside the battery, and th...

AI Technical Summary

Problems solved by technology

Therefore, it is often necessary to waste a lot of energy and time in order to achieve the drying effect before the polymer lithium-ion battery is injected.

In fact, the entire process of drying and removing water before polymer lithium-ion battery injection does not take into account the temperature consistency of the oven, the moisture concentration inside the battery, and the cut-off point of pumping time when the oven gas is saturated with water. , there are problems such as the water is saturated and the water has not been removed in time and the drying gas has not been replaced in time

In addition, it did not consider how to improve the baking heating efficiency in the initial stage of battery baking, and the moisture and gas in the oven in the initial stage need to be removed in time, resulting in low battery baking efficiency and insufficient water removal, which seriously affected the polymer. The ultimate electrochemical performance and safety performance of lithium-ion batteries

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