Dispersing and spraying automatic continuous production system of electrode paste of power battery

Abstract

The invention discloses a dispersing and spraying automatic continuous production system of electrode paste of a power battery, which comprises a proportioner, an initial stirring device, a paste dispersing device, a filtering device and a spraying device, wherein the proportioner is used for proportioning materials according to a set proportion, then the proportioned materials are transmitted into the initial stirring device for stirring, the initial stirring device is connected with the paste dispersing device which is connected with the filtering device, the filtering device is connected with the spraying device; and the paste dispersing device comprises a reaction pipe and at least one clamp type ultrasound processor, and the at least one clamp type ultrasound processor is clamped on the reaction pipe through a functional clamp. The invention has the advantages that small particles in the paste can be effectively dispersed uniformly by the two-stage ultrasound paste dispersing device so as to overcome phenomena of the agglomeration and the like; the sprayed electrode paste material is good in flexible and flat consistency, can effectively reduce the internal resistance and improve the property of the lithium ion power battery; and the spraying and adhering firm, flexible and flat consistency quality is improved, and the production cost can be effectively lowered.

Description

technical field [0001] The invention relates to the technical field of battery material production, in particular to an automatic continuous production system for the dispersion and coating of power battery electrode slurry with excellent dispersion uniformity and coating consistency. Background technique [0002] Lithium-ion power battery is a large-capacity, high-power large-scale lithium-ion battery that meets the needs of hybrid electric vehicles, pure electric vehicles, electric bicycles, electric motorcycles, uninterruptible power supplies, lawn mowers, miner's lamps, and small power stations. Battery. Lithium-ion power batteries can use electric energy to replace petroleum energy in a wide range of fields. It is a very environmentally friendly, energy-saving, emission-reducing, and low-carbon clean energy. Lithium-ion power batteries have the characteristics of high energy density, good safety and long cycle life, and have become the preferred mobile energy for elect...

AI Technical Summary

Problems solved by technology

Poor fluidity leads to poor uniformity of coating, manifested as increased surface density tolerance of pole pieces and poor surface morphology, seriously affecting quality

[0005] Since the uniformity of the material cannot be solved, there will be many quality problems in the follow-up: uneven coating, poor consistency, due to the large specific surface area of ​​lithium iron phosphate and the large amount of binder, the solvent required for the preparation of the slurry The dosage is large, and it is difficult to dry after coating; the particles of lithium iron phosphate are small, and the specific surface area is much larger than that of lithium cobaltate and lithium manganate, and more binders are needed.

In order to improve the bonding effect, the current general practice of lithium iron phosphate processing is to increase the molecular weight of the binder on the one hand (high molecular weight, improved bonding ability, but the more difficult the dispersion and the higher the impedance), on the one hand, to increase the amount of binder At present, it seems that the results are not satisfactory. At present, when processing lithium ferrous phosphate pole pieces, it is generally felt that the pole piece is relatively hard and brittle, which may not affect the lamination obviously, but it is very unfavorable for winding.

The flexibility of the pole piece is not good, and it is easy to drop powder and break when winding and bending, resulting in short circuit and other adverse conditions

The explanation of the mechanism in this aspect is not yet clear. It is speculated that the problem of the particle structure leads to the small elastic space of the coating.

Reducing the compacted density can improve, but the volumetric energy density is also reduced

Originally, the compaction density of lithium iron phosphate is relatively low, and reducing the compaction density is an unavoidable means; at the same time, it will cause serious waste and relatively high production costs

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