Preparation device and preparation process of power lithium ion battery pole piece

Abstract

The invention belongs to a preparation device and preparation process of a power lithium ion battery pole piece. The preparation device comprises a twin-roller machine, wherein the twin-roller machine is provided with a winding device at a tail end, a splitting machine with a splitting winding device, a piece making machine, a baking oven with a post-baking winding device and a battery pole piece winding machine are sequentially arranged at the tail end of the twin-roller machine with the winding device at the tail end, and a transmission device is arranged in the baking oven with the post-baking winding device. The preparation device has the advantages that the battery pole piece before winding can be fully expanded and is uniform in thickness, the roll core is uniform in size after the battery is wound, the external diameter variance of the roll core is smaller than 0.01, and the internal resistance variance of a finished product is smaller than 1.0.

Description

technical field [0001] The invention belongs to the technical field of battery pole piece preparation, and in particular relates to a power lithium ion battery pole piece preparation device and a preparation process thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high output voltage, high specific energy, stable discharge voltage and long cycle life. Therefore, lithium-ion batteries have been widely used in notebook computers, digital cameras, and mobile phones; more and more, they have been applied in the fields of power and energy storage. Since the use of lithium batteries in the power and energy storage fields requires multiple strings and multiple parallels to meet the demand, higher requirements are placed on the consistency of batteries. [0003] At present, with the continuous improvement of equipment automation, the uncontrollable factors in the production process of lithium-ion batteries are gradually reduced, and the batte...

AI Technical Summary

Problems solved by technology

However, in the process of battery pole piece preparation, there is often a problem that after the battery pole piece rolls, the pole piece enters the winding process without timely, effective and uniform expansion; one solution is that the battery pole piece is directly wound without baking. , due to the effect of aging, the expansion of the rolled battery pole piece will cause the battery core to be wound too tightly, which will easily cause leakage, increase the internal resistance of the battery, and deteriorate the cycle; another solution is to dry the battery pole piece after winding. Baking, because the force of the battery pole piece after winding is uneven, the rebound thickness of the inner ring and the outer ring will be inconsistent, resulting in poor consistency of the internal resistance and cycle of the battery cell, and the problem of shortened battery life is prone to occur

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