Novel slitting-free pole piece structure of lithium ion power battery

Abstract

The invention discloses a novel slitting-free pole piece structure of a lithium ion power battery. The novel slitting-free pole piece structure comprises a foil main body and an active substance layercoated on the surface of the foil main body, a reserved foil (4) and a foil tab (1) are longitudinally distributed at the left side and the right side of the active substance area (2), and the activesubstance area is close to the edge of one side of the reserved foil and is provided with a cut active substance (3) which is longitudinally distributed and has a preset width. The right side of thecut active substance is provided with a virtual cutting line (30), and the virtual cutting line is the edge of the pole piece after the punching operation of a punching device. By optimizing the process structure of a battery and further optimizing the process route of the battery, the problem of unwinding of the pole roll after a pole roll is baked by the oven can be solved, the rolled pole piecedoes not need to be slit, the slitting process of the pole piece can be reduced, and the production cost of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a novel cutting-free pole piece structure of a lithium-ion power battery. Background technique [0002] At present, lithium-ion batteries have the advantages of high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also widely used in electric vehicles, Electric bicycles and electric tools and other large and medium-sized electric equipment have become one of the high-profile power sources, so the performance requirements of lithium-ion batteries are getting higher and higher. [0003] Moisture is the natural enemy of lithium-ion batteries. For lithium-ion batteries, the moisture content of the pole roll must be controlled within a certain range. Therefore, the pole roll must be baked in an oven before it can be transferred t...

AI Technical Summary

Problems solved by technology

[0003] Moisture is the natural enemy of lithium-ion batteries. For lithium-ion batteries, the moisture content of the pole roll must be controlled within a certain range. Therefore, the pole roll must be baked in an oven before it can be transferred to the follow-up. However, the pole roll must be baked Prone to unwinding problems

Decoiling means that when the pole roll is baked, the alignment of the side of the pole roll changes due to stress release, which seriously affects the yield rate in battery production.

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