Drying method of pole piece for lithium ion battery

Abstract

The invention discloses a drying method of a pole piece for a lithium ion battery. The drying method comprises the following steps of: in a closed rectangular passage, first, blowing the pole piece horizontally moving to be dry by using dry hot nitrogen with a water content below 10 ppm and at temperature of 60-120 DEG C, and then, blowing the pole piece to be dry by using dry normal-temperature nitrogen with a water content below 10 ppm and at temperature of 15-35 DEG C. The method is simple, applicative, time-saving and labor-saving; the drying treatment for tens of minutes is only needed, so that the moisture content of a battery core before liquid injection can be controlled below 50 ppm; the manufacturing time of the lithium battery is greatly reduced; the dryness extent of the battery is improved; and the high-performance exertion of the battery is beneficial.

Description

technical field

[0001] The invention relates to the manufacture of lithium ion batteries, in particular to a method for drying lithium ion battery pole pieces. Background technique

[0002] Compared with traditional storage batteries, lithium-ion batteries have excellent performance advantages such as high operating voltage and good cycle life; these excellent performances are largely due to the fact that the working system of lithium-ion batteries belongs to a non-aqueous electrochemical system, so it is necessary to manufacture To produce a lithium-ion battery with excellent performance, it is necessary to do a good job of drying the battery, especially the pole piece. In the production of conventional lithium-ion batteries, the pole pieces and winding cores need to be baked in an oven for several hours to tens of hours, and the water content of the battery is often higher than 100ppm before the final liquid injection, which is time-consuming and laborious, and the effect ...