Method for estimating SOC (State Of Charge) of lithium battery of low-velocity electronic vehicle

Abstract

The invention discloses a method for estimating the SOC (State Of Charge) of a lithium battery of a low-velocity electronic vehicle. The method comprises the following specific steps of: (1) when the low-velocity electronic vehicle is electrified, performing rated capacity calculation on the lithium battery so as to ensure that the reference rated capacity of SOC is calculated and the SOC is accurate after the capacity of the lithium battery is attenuated, wherein a rated capacity estimation equation is as follows: Q rated=Q initial*K*SOH; and (2) performing SOC calculation, namely, performing SOC estimation, wherein an SOC estimation equation for SOC estimation is as shown in the specification in the charge and discharge process when an ampere-hour integral method is implemented. By adopting the method, an open circuit voltage method, the ampere-hour integral method and various modification compensation algorithms are respectively combined under different conditions to meet requirements of the low-speed electronic vehicle on battery SOC estimation precision in complex and variable working environments. Practical verification of the method shows that the precision can be up to 5%, and driving requirements of the low-speed electronic vehicle can be very well met.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for estimating the SOC of a lithium battery of a low-speed electric vehicle. Background technique [0002] Low-speed electric vehicles generally refer to vehicles with low driving speed, short driving range, and safety technical performance that do not meet the current electric vehicle standards. Low-speed electric vehicles are cheap and cost-effective. They have grown rapidly in some areas in recent years, and their scale has continued to expand. With the gradual standardization of the country's management of low-speed electric vehicles, more and more low-speed vehicles use lithium batteries as power, and the SOC of lithium batteries, as a key indicator of lithium batteries, is of great significance in the use of low-speed electric vehicles . [0003] The full name of SOC is State of Charge, also known as the remaining capacity, which represents the ratio of the remai...

AI Technical Summary

Problems solved by technology

The traditional SOC estimation method cannot realize the online real-time accurate estimation of the SOC of the low-speed electric vehicle battery pack at all.

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