Vacuum oven and drying method of power lithium ion cell pole piece

Abstract

The invention discloses a vacuum oven and a drying method of a power lithium ion cell pole piece. The vacuum oven comprises an oven body, a heating device and a vacuum pumping device. A drying chamber is arranged in the oven body. Two parallel rotatable rotation shafts are arranged in the drying chamber. Two ends of a pole piece roll material are wound on the two rotation shafts respectively. Compared with the prior art, the two rotation shafts are arranged and rotate in two directions to drive the pole piece roll material to be wound back and forth. In the process of rolling the pole piece roll material, the heating device can dry the pole piece roll material at the same time. The pole piece roll material can be wound back and forth to ensure that pole pieces of all parts can be evenly dried. Thus, drying uniformity of the cell pole piece is improved.

Description

technical field [0001] The invention belongs to the technical field of power lithium batteries. Specifically, the invention relates to a vacuum oven for pole pieces of power lithium-ion batteries and a drying method thereof. Background technique [0002] At present, the pole pieces of power lithium-ion batteries are mainly dried in a vacuum oven. The vacuum oven includes a box body, a drying chamber, heating components, and vacuum components. The drying process is mainly to put the pole pieces to be dried into the drying chamber, and dry the battery pole pieces by vacuumizing the drying chamber, heating and preset drying time. However, the existing vacuum ovens often have the following deficiencies: First, the temperature and moisture distribution in the drying chamber are uneven, which often leads to large fluctuations in the moisture content of each pole piece after drying, usually between 10% and 15%; Second, because the material is always surrounded by oxygen during th...

AI Technical Summary

Problems solved by technology

However, the existing vacuum ovens often have the following deficiencies: First, the temperature and moisture distribution in the drying chamber are uneven, which often leads to large fluctuations in the moisture content of each pole piece after drying, usually between 10% and 15%; Second, because the material is always surrounded by oxygen during the drying process, it is very easy to cause the pole pieces to oxidize or even burn at high temperature, causing danger; third, the entire drying process is carried out under high temperature and high vacuum. Completed, so there may be a situation where the internal pressure of the vacuum oven is too high, thereby causing the danger of oven explosion; fourth, the existing vacuum ovens often use natural cooling to cool the drying chamber and pole pieces, which leads to drying The process takes a long time and the efficiency is low, which reduces the production efficiency of battery pole pieces; fifth, the volume of the vacuum oven is usually small, which is not suitable for industrial mass production, and its heating efficiency is not high, which easily affects production efficiency

[0003] In order to solve the above problems, the patent document with the publication number CN 102072620A discloses a vacuum oven for battery pole pieces. However, although the vacuum oven with this structure can reduce the water content of the pole pieces and improve drying efficiency and safety, However, the moisture content of the pole piece is uneven after drying, that is, the drying uniformity is poor, and the baking effect inside the coil is worse than that outside; and with the rise of the lamination process, this oven is not suitable for the pole piece of the lamination process battery Sheet baking; all operations of this oven need to be done manually, with a low degree of automation

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