Thick electrode structure of lithium ion battery

Abstract

The invention provides a thick electrode structure of a lithium ion battery. The thick electrode structure comprises a coating machine die head, and a gap between a coating die head lip and a current collector is formed between the coating machine die head and a negative current collector; the coating machine die head is provided with a plurality of coating machine die head cavities, and the cavities are not communicated with one another; negative electrode slurry with different components is extruded from a slit of the coating machine die head lip, so that negative electrode slurry with different components can be formed, the current collector is wet-coated with the negative electrode slurry with different components at the same time; two sides of a dressing layer of a rolled electrode roll are respectively provided with a non-tab side blank space and a tab side blank space, and electrode thickness direction grooves are arranged along an electrode thickness direction; groove gaps are formed between the electrode thickness direction grooves, and the electrode thickness direction grooves are formed in the surface of each electrode piece. According to the thick electrode structure of the lithium ion battery, the infiltration of electrolyte from the surface of the dressing layer to the current collector is facilitated, the binding power between the dressing layer and the current collector and the rate and cycle performance of the thick electrode battery are improved, and the lithium precipitation risk under high-rate charge and discharge is reduced.

Description

Technical field [0001] Technical Field The present invention pertains to the production of lithium-ion battery, particularly to a lithium ion battery electrode structure thickness. Background technique [0002] With the maturity of the development of lithium-ion battery technology, we continue to support the national policy for the development of new technology and promote the energy industry, new energy automotive industry demand for lithium-ion batteries high energy density, light weight and high power is increasing. The method of improving the current lithium ion battery energy density, one from the design point of view, to increase the volume of the electrical design space of the core structure, to increase the total amount of active substance; the second is the ratio of the design from the electrochemical point of view, to reduce non-active ingredients , increase the proportion of the active material in the electrode; third material system from the design point of view, redu...

AI Technical Summary

Problems solved by technology

The single-porosity and pore-diameter structure electrode design increases the amount of single-layer coating, reduces the proportion of active materials, and adds porous channel conductive agent. The solvent floats up, which will easily lead to poor peeling force of the pole piece, uneven distribution of conductive agent and pores; in order to improve the energy density of the battery, from the perspective of increasing the surface density of the electrode, the coating amount of the electrode is increased, and the thickness of the electrode is increased. The tortuosity of the pores becomes larger, making it more difficult for the thick electrode electrolyte to infiltrate

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