Roller manufacturing method for lithium battery pole piece rolling mill

Abstract

The invention discloses a roller manufacturing method for a lithium battery pole piece rolling mill. The method includes the steps that a roller is subjected to cryogenic treatment after quenching, a matched cryogenic device is used, and a transverse feeding mode is adopted, so that the roller feeding is made more convenient, and the feeding time is greatly saved. A rotary cold air conveying mode is adopted, and meanwhile, the roller rotates by itself, so that the roller is cooled more uniformly, and partial excessive cooling of the surface of the roller by direct injection of liquid nitrogen is avoided. Each liquid dipping strip is ingeniously provided with a thin liquid storage tank to store a small amount of liquid nitrogen, so that the cold source amount carried by each liquid dipping strip entering the liquid storage tank each time is ensured, and the refrigeration effect is also guaranteed. And meanwhile, the phenomenon that the liquid nitrogen is thrown out to directly fall off onto the roller due to operation shaking of a cold source conveying mechanism is effectively prevented. And the driving mechanism adopts chain gear transmission and is matched with a tensioning gear, so that the roller is conveniently connected into the driving mechanism, and the equipment cost is further reduced.

Description

technical field [0001] The invention relates to the field of rolls, in particular to a roll manufacturing method for a lithium battery pole piece rolling mill Background technique [0002] The lithium battery pole piece is rolled by a rolling mill; the compaction density of the pole piece has an important influence on the electrochemical performance of the battery. Within a certain range, as the compaction density increases, the distance between the active material particles decreases, the contact area increases, and the channels and bridges that are conducive to ion conduction increase, which is manifested as a decrease in the internal resistance of the battery in the macroscopic aspect. However, if the compaction density of the pole piece is too large, the contact degree between the active material particles is too close, and the electronic conductivity increases. However, the reduction or blockage of lithium ion channels is not conducive to the development of capacity. W...

AI Technical Summary

Problems solved by technology

However, the reduction or blockage of lithium ion channels is not conducive to the development of capacity. When discharging, the polarization increases, the voltage decreases, and the capacity decreases.

If the compaction density is too small, the distance between particles is large, the lithium ion movement channel is smooth, and the electrolyte has a strong liquid absorption capacity, which is conducive to the movement of lithium ions inside the battery. However, due to the insufficient contact between the particles, it is not conducive to the conduction of electrons. , tends to lead to increased polarization

Therefore, the hardness of the roll surface of the roll needs to be uniform, otherwise the compaction density in some areas will be too high, and the compaction density in some areas will be too small, which cannot guarantee the rolling quality of the pole piece

[0003] Chinese patent CN 109609852 B records the structure of the cryogenic device in a preparation method of work rolls of tempering mill and skin pass mill, but the roll needs to be placed on the top of the cryogenic device, which is very inconvenient to remove and requires Driving and other tools for lifting

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