Computing method for battery electric quantity state

Abstract

A battery electric quantity state calculating method relates to an electric automobile lithium ion battery electric quantity state calculating method, which solves the existing problems that the existing method for calculating the SOC is greatly influenced by the training methods and the training data, has a large amount of data processing, high requirements for the processor performance and a lack of considering the environment temperature and the influence of the cycle number on the battery rated capacity; the results have errors. The method of the invention has the steps that an initialization signal collection system collects the current system parameters and carries out the digital to analog conversion of the collected signals, orderly reads the cycle technical parameters and the resting time parameters, and then selects initial open-circuit voltage; the collected relative parameters are input into a processor to calculate, the results are stored, and a time counter is reset; finally the results are output to display. The calculating method has the advantages of high calculation accuracy and practicality, small data processing amount, low requirements for the processor performance and small errors.

Description

technical field [0001] The invention relates to a method for calculating the state of charge of a lithium ion battery of an electric vehicle. Background technique [0002] The state of charge (SOC) of the battery has always been a subject of common concern and research by electric vehicle and battery researchers. In hybrid electric vehicles, SOC is an important basis for the vehicle controller to formulate energy control strategies. SOC, a battery capacity state description parameter, is widely used at home and abroad. The general definition of SOC is to accurately calculate the capacity of the battery, that is, to predict the remaining energy of the battery. SOC is an important parameter to describe the state of the secondary battery. Usually, the SOC when the secondary battery is charged to the point where it can no longer absorb power at a certain temperature is defined as SOC=100%, and the power state when the secondary battery can no longer discharge power is defined. ...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the existing methods for calculating SOC that are greatly affected by the training method and training data, the amount of data processing is large, the requirements for processor performance are high, and the environment temperature and the number of cycles do not affect the rated capacity of the battery. Considering, the problem that calculation result has error, proposed a kind of calculation method of battery charge state, the present invention is realized by the following steps:

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