Drying device and method of lithium-ion power battery pole piece

Abstract

The invention provides a drying device and a drying method of a lithium-ion power battery pole piece. The drying device comprises a bracket, an unreeling mechanism, a rolling mechanism and an infrared heater; the unreeling mechanism, the rolling mechanism and the infrared heater are mounted on the bracket; the lithium-ion power battery pole piece is wound on the unreeling mechanism; one end of the lithium-ion power battery pole piece is fixedly arranged on the unreeling mechanism; the other end of the lithium-ion power battery pole piece is fixedly arranged on the rolling mechanism; and the lithium-ion power battery pole piece is dried by passing through the infrared heater at a uniform speed under the driving of the rolling mechanism. The drying method comprises an unreeling mechanism arranging step, an infrared heater arranging step, a rolling mechanism arranging step and a drying step. With the adoption of the drying method and the drying method provided by the invention, water is uniformly discharged by the pole piece, so that the difference of electrolyte consumption of a lithium-ion power battery can be avoided, the cycle life of the battery is prolonged, and the security in use can be improved.

Description

technical field [0001] The invention relates to a drying technology for lithium-ion power battery pole pieces, in particular to a lithium-ion power battery pole piece drying device and method for water treatment before pole piece lamination. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and electric tools. Therefore, the performance and cost requirements of lithium-ion batteries Higher and higher. The current lithium-ion power battery basically adopts the lamination method, but some moisture will enter the pole piece during the production process of the pole piece, so the water must be removed before lamination. If the moisture in the pole piece is too high, the After the battery is assembled, the electrolyte in the battery will be consumed to form hydrofluori...

AI Technical Summary

Problems solved by technology

The current lithium-ion power battery basically adopts the lamination method, but some moisture will enter the pole piece during the production process of the pole piece, so the water must be removed before lamination. If the moisture in the pole piece is too high, the After the battery is assembled, the electrolyte in the battery will be consumed to form hydrofluoric acid, which will cause the battery to bulge, reduce the cycle life, and even cause the battery to explode and leak after bulging, causing safety accidents

[0003] The application number is "201010601374", and the Chinese invention patent application titled "Method for drying lithium-ion secondary battery pole pieces" discloses a drying method for lithium-ion battery pole pieces, but the pole piece drying method has the following disadvantages : After the pole piece is rolled into a roll, it is placed in a sealed box, heated, evacuated, and the gas with moisture in the sealed box is replaced with an inert gas, and so on, but because the pole piece is placed in a roll, the pole piece inside the roll core The moisture in the coil cannot come out, resulting in the difference in the moisture content of the coiled pole pieces, causing the difference in the electrolyte consumption of the battery, affecting the cycle characteristics of the battery, and even causing safety accidents

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