Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery

Abstract

The invention discloses an electrode pole plate of a lithium ion battery. The electrode pole plate comprises a current collector and active substance coating layers, wherein the active substance coating layers are uniformly coated at two sides of the current collector, and grooves are symmetrically and uniformly formed in surfaces of the active substance coating layers at two sides. A thick pole plate with specially-shaped grooves in a surface are prepared, the electrolyte retention quantity in the battery can be remarkably increased, and long-term recycle of the battery is promoted; moreover, the specially-shaped grooves are uniformly formed in the surface of the thick pole plate, electrolyte penetration and diffusion are facilitated, and the rate charge-discharge electrochemical performance of the battery is improved; and meanwhile, the specially-shaped grooves are uniformly formed in the surface of the thick pole plate, thus, the specific area of the pole plate is expanded, the polarization current density of the battery during the charge-discharge process is reduced, a lithium precipitation risk of a large-current charging positive electrode separator is improved, and the application safety of the battery is improved.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a lithium ion battery electrode pole piece, a pole piece rolling device and a lithium ion battery. Background technique [0002] With the vigorous promotion of new energy vehicles, the demand for power batteries is increasing. In particular, the desire for high energy, high safety, and long cycle life lithium-ion power batteries is particularly prominent. High energy density lithium-ion power batteries usually have: (1) high active material content per unit mass (volume space), (2) high gram capacity positive / negative electrode materials, (3) lower mass density packaging materials, etc. In recent years, many lithium battery manufacturers have increased the space occupancy ratio of active materials by increasing the coating thickness or compaction density of the active material of the pole piece, so as to achieve the purpose of improving the overall energy density of the battery. Howev...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a lithium-ion battery electrode pole piece, which aims to solve the negative problems caused by the use of thick active material coating pole pieces in existing high-energy-density lithium-ion batteries

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