A method for fast drying of power battery cells

Abstract

The invention relates to a method for quickly drying power battery cells, comprising the following steps: 1) spraying a black ink layer on the surface of the battery case, and / or performing frosting treatment on the surface of the battery case, with a roughness Ra of 0.8-1.6 μm ; 2) Put the bare cell into the treated battery case, and assemble it into a battery according to the conventional assembly process; 3) Place the battery in a vacuum drying oven, and heat up, the heating time is 0.2 ~ 2H, and the temperature is raised to the temperature 80-110°C; 4) After the heating is completed, vacuum the vacuum drying furnace to make the vacuum degree ≤ 500Pa, and keep the temperature at 80-110°C, and the baking time is 4-10H; 5) After the baking is completed, take out the battery Test for water content. The present invention increases the blackness of the shell by performing frosting treatment on the surface of the smooth shell or spraying a black ink layer on the surface of the shell, increases the absorption of heat radiation by the shell, increases the heating speed, and further improves the baking efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for quickly drying power battery cells. Background technique [0002] As a new type of clean and renewable secondary energy, lithium-ion power batteries have the advantages of high energy density, small self-discharge, good safety performance and high rate performance. They have become excellent energy sources for electronic equipment and power vehicles and have been widely used. Lithium battery enterprises not only pay attention to the improvement of product quality, but also pay attention to the improvement of production efficiency and the reduction of production cost. [0003] In the production process of lithium-ion batteries, the water content of the pole pieces must be strictly controlled to ensure the electrochemical performance and safety performance of the battery. Exceeding the water content of the pole piece will lead to battery flat...

AI Technical Summary

Problems solved by technology

[0004] At present, enterprises generally use vacuum drying ovens for battery baking, but the baking time is longer and takes up more ovens. Different types of batteries have different baking times. Generally, the total drying time is 20~50h, and the baking needs to be continuously heated, Vacuuming, filling inert gas and other links, in the process of vacuuming and filling inert gas, a large amount of heat needs to be reheated and baked; heating is mainly achieved by heat convection and heat radiation, but the surface of the square battery shell battery Very smooth is not conducive to the increase of battery temperature by heat radiation, which reduces the baking efficiency and increases energy consumption

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