Battery pole piece rolling method and battery pole piece multistage roller machine

Abstract

A battery pole piece multistage roller machine comprises a thicknessing device. The thicknessing device comprises a first roller and a second roller. A gap adjusting mechanism is arranged between bearing blocks at the two ends of the first roller, and a gap adjusting mechanism is arranged between bearing blocks at the two ends of the second roller. Hydraulic devices act on the two ends of the first roller or the two ends of the second roller to make the roll gap between the two rollers maintained basically constant. The battery pole piece multistage roller machine further comprises at least one prepressing device. Each prepressing device comprises a first prepressing roller, a second prepressing roller and a pair of prepressing roller elastic hydraulic devices, a prepressing roller gap is formed between the first prepressing roller and the second prepressing roller, and the prepressing roller elastic hydraulic devices respectively act on the two ends of the first prepressing roller or the two ends of the second prepressing roller to make the pressure of the first prepressing roller or the pressure of the second prepressing roller maintained basically constant. The battery pole piece multistage roller machine is wide in application range and can be used for a single-side pole piece or a two-side pole piece or an ordinary pole piece without any structural adjustment, and therefore universality of the roller machine is improved.

Description

technical field [0001] The invention relates to a battery pole piece rolling method for battery pole pieces, especially a lithium ion battery pole piece, and a multistage rolling machine thereof. Background technique [0002] Lithium-ion batteries are composed of lithium-ion cells, electrolyte, protection circuit (PCM) and casing. The battery cell is composed of positive electrode, negative electrode and separator. The components of the positive electrode are positive electrode materials (such as lithium iron phosphate) + conductive agent + binder (PVDF) + current collector (aluminum foil), and the components of the negative electrode are graphite + conductive agent + thickener (CMC) + binder (SBR) + current collector (copper foil). The positive and negative electrodes are generally called battery pole pieces in the industry. In order to improve the density and thickness consistency of the surface material of the battery pole piece, the positive and negative pole pieces mu...

AI Technical Summary

Problems solved by technology

This kind of rolling mill can be used between rolling ordinary pole pieces and other single-sided and double-sided pole pieces. subject to certain restrictions; in addition, if the disc spring is set between the upper and lower roller bearing seats, it is impossible to control the elastic force of the disc spring. With the increase of the compression times of the disc spring, the creep of the disc spring will cause the elastic coefficient to change, resulting in The pressure acting on the pole piece changes, and the pressure change is uncontrollable, so its compression ratio is difficult to control accurately

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