Device and method for estimating health status and state of charge of battery pack on line

Abstract

The invention discloses a device and a method for estimating the health status and the state of charge of a battery pack on line. A monitoring unit measures the running status of the battery pack in real time; a storage unit stores data measured by the monitoring unit; an iterative computation unit computes an iteration parameter of a battery model; a voltage prediction unit calculates and outputs a voltage predicted value; an error computation unit computes an error between the voltage predicted value and a measured value; a parameter prediction unit calculates equivalent internal resistance and equivalent capacitance of the battery pack; an average temperature computation unit computes an environmental temperature average value within one hour; a temperature correction unit converts the parameter value of the battery pack into a corrected value at the normal temperature of 25DEG C; a health status estimation unit predicts the health status of batteries; a decoupling unit decouples the heath status and the state of charge of the batteries; a stage of charge estimation unit predicts the state of charge of the batteries. The device can estimate the health status and the state of charge of the batteries under real-time working condition.

Description

technical field [0001] The invention relates to a device and method for estimating the state of health and state of charge of a battery pack. Background technique [0002] With the continuous depletion of fossil energy and the continuous development of battery technology, battery energy storage technology has been used more and more. For example, in technical fields such as electric vehicles, uninterruptible power supply systems, and distributed energy storage, battery packs play a key role as the core energy source. During the use of the battery pack, due to the influence of environmental temperature, charge-discharge depth, charge-discharge rate and other factors, the state-of-charge (State-of-Charge, SOC) and state-of-health (State-of-Health, SOH) of the battery pack ) are subject to change at any time. In extreme cases, the battery pack may work in an unsafe state, resulting in failure of the battery system, and even explosion, fire and other dangerous situations. The...

AI Technical Summary

Problems solved by technology

However, the implementation of this method requires a large amount of experimental data as support. When the actual working environment of the battery is different from the test environment, the prediction accuracy cannot be guaranteed, and this method can only perform offline open-loop prediction.

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