Negative Electrode Plate Fast Charge Design Using Empirical Formula
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Solution Overview
Problem
The long development cycle for designing a negative electrode plate in fast charge batteries is a significant challenge due to the complex interplay of technical parameters affecting charging speed, which limits the application and user experience of electric vehicles.
Innovation Solution
A method using an empirical formula A=CW*(PD−1)*(OI+D50+D90)/(w*100) to quickly evaluate and determine the fast charge performance of a negative electrode plate, where CW is the coating weight, PD is the press density, OI is the orientation index, D50 and D90 are particle sizes, and w is the mass percentage of active carbon atoms, allowing for the selection of appropriate parameters for different charging rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional experimental methods are used to determine fast charge performance of negative electrode plate, then accurate performance evaluation can be obtained, but the design cycle becomes excessively long
Solution Approach 1:
The patent creates a simplified calculation model that copies the essential relationships between electrode plate parameters and fast charge performance. Instead of conducting full battery assembly and testing for each parameter combination, the invention uses an empirical formula that replicates the performance evaluation function, allowing rapid assessment without physical prototypes.
Solution Approach 2:
The patent replaces the mechanical/experimental system of assembling batteries and conducting charge-discharge tests with a computational system. The empirical formula A=CW×(PD-1)×(OI+D50+D90)/(w×100) substitutes physical experimentation with mathematical calculation, eliminating the need for repeated battery assembly and testing while maintaining evaluation accuracy.
2Speed
If multiple technical parameters of negative electrode plate are adjusted to optimize fast charge performance, then charging speed can be improved, but the complexity of the design process increases
Solution Approach 1:
The patent systematically changes and optimizes key parameters of the negative electrode plate (coating weight CW, press density PD, orientation index OI, particle sizes D50 and D90, and active carbon content w) to achieve desired fast charge performance. The empirical formula provides a direct relationship between these parameters and charging rate, allowing designers to adjust parameters methodically without navigating complex experimental trial-and-error.
3Manufacturing precision
If repeated experiments are conducted to verify parameter effects, then optimal negative electrode plate design can be achieved, but productivity decreases
Solution Approach 1:
The patent performs preliminary calculations using the empirical formula to predict the effects of different parameter combinations before actual manufacturing or experimentation. This preliminary action allows designers to identify optimal parameter ranges in advance, reducing or eliminating the need for repeated verification experiments and significantly improving development productivity.
Data Source
AI summary
The present application provides a method for determining fast charge performance of a negative electrode plate and a method for designing a negative electrode plate. By utilizing the method(s) according to the present application, the charging speed of a negative electrode plate can be quickly evaluated and the design period of a negative electrode plate in a fast charge battery can be greatly shortened.