Control system for lithium ion battery of electric car

Abstract

The invention discloses a control system for a lithium ion battery of an electric car. The system achieves the safety control of the battery through precise estimation and feedback of the residual electric quantity of the battery, collects a discharging current, an output voltage and the temperature of the battery, carries out the filtering and noise reduction through a filter, and builds a mathematic relation between the residual capacity of the battery and the output current of the battery based on an ampere-hour method and a Proctor empirical formula. The system gives consideration to the temperature factor and a nonlinear change factor of the initial capacity of the battery, carries out the correction and compensation of the Kalman method, and reduces the estimation error of the residual capacity of the battery. The system employs an open-circuit voltage method and the Kalman filtering method for prediction and comparison, carries out the compensation of a gain matrix, obtains the nearly real initial capacity of the battery, and enables the prediction and estimation error to be smaller. Meanwhile, the system gives consideration to the impact on the residual capacity of the battery from the temperature, corrects the mathematic model of the ampere-hour method through the corrected parameters K and n, and further reduces the estimation error.

Description

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AI Technical Summary

Benefits of technology

This patented technology predicts how old or poor batteries are by comparing their performance against older ones before they reach full power level (Battery Charge Efficiency). By measuring this difference between new batteries and previous batteries, it can help identify any issues early during manufacture process for maintenance purposes. It also considers factors like ambient temperatures which affect the overall ability of certain types of cells used inside an electric vehicle's charger system. Overall, these technical features improve the accuracy and effectiveness of charging systems.

Problems solved by technology

This patents describes an electric car's battery management systems (BMSS) which are designed specifically for better performance in managing batteries under varying conditions over their lifespan. These technical problem addressed by this technology includes improving how well these devices estimate the amount of stored electrical charge they have at any given point on time without being influenced from external influences like temperature fluctuations.

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