An optimization method of electrode design parameters of lithium ion batteries

Abstract

The invention discloses an optimization method of electrode design parameters of a lithium ion battery, which relates to the field of internal structure design of the lithium ion battery. The electrode design parameters can include electrode thickness, porosity, particle size of an active material, compaction density and surface density, etc. The specific optimization steps comprise (1) selectingthe battery to be optimized, and measure the electrode design parameters that can be actually measured; (2) establishing the electrochemistry of lithium ion batteries according to the measured and estimated parameters, and using the thermally coupled model to adjust the estimated parameters through experimental verification. (3) in order to maximize the energy density and the product of energy density and power density, using two optimization methods to obtain the optimized electrode design parameters. The method of the invention can select the optimized electrode design parameters in the battery design stage, reduce the development cost, improve the energy density and the power density of the battery, and provide a guiding basis for the electrode design.

Description

technical field [0001] The invention belongs to the field of internal structure design of lithium ion batteries, and in particular relates to an optimization method of electrode design parameters of lithium ion batteries. Background technique [0002] At present, people are pursuing lithium-ion batteries with high energy density and power density, but there is a certain contradiction between the two. In general, the higher the energy density, the lower its power density. For example, for an electric vehicle, the energy density determines its maximum mileage, and the power density determines its maximum driving speed. Therefore, how to achieve both "running fast" and "running far" is also a challenge today. The electrode of a lithium-ion battery is the most important component of the entire battery, and its design determines the final capacity, energy density, power density, and other performance of the battery. [0003] Using traditional experimental methods to design and ...

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Problems solved by technology

This patent is only applicable to the optimization of a given battery electrode thickness, not applicable to other electrode design parameters, and this patent is only aimed at maximizing a single energy density as the optimization goal, without comprehensively considering the two factors of energy density and power density, while One should not ignore power density while pursuing high energy density, so it is important to consider energy density and power density together

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