Energy storage battery stack three-dimensional temperature visualization method based on infrared image

Abstract

The invention discloses an energy storage battery stack three-dimensional temperature visualization method based on an infrared image. According to the method, firstly, a surface source blackbody is used as a benchmark to collect grayscale images of an infrared thermal imager under different blackbody temperature, and a temperature and grayscale mapping model is established; the acquired infraredimage is preprocessed, a battery stack surface is separated, then the surface is divided, subunit grayscale is calculated, and battery stack surface temperature is obtained according to the temperature and grayscale mapping model; based on the principle of inverse distance weight interpolation, battery stack three-dimensional temperature is obtained through preliminary interpolation on the batterystack surface temperature, then a battery stack three-dimensional temperature error is obtained according to interpolation on temperature errors of N temperature sensors, a battery stack three-dimensional temperature model is corrected, and reserved output of the temperature sensors is used for evaluating the battery stack three-dimensional temperature model; and the model of a battery in use isused as a benchmark to establish a battery impedance and temperature mapping model, and acquired internal temperature of stereoscopic subunits is used to correct the three-dimensional temperature model. Through the method, qualitative and positioning analysis can be performed on a battery stack thermal fault more intelligently.

Description

technical field [0001] The invention belongs to the field of thermal management of energy storage battery stacks, and provides a three-dimensional temperature visualization method for the thermal management of battery stacks. Background technique [0002] In recent years, due to the advantages of high power / energy density, long cycle life, and low self-discharge rate, lithium-ion batteries have attracted widespread attention from academia and industry, and have been used in consumer electronics, electric vehicles, distributed energy storage, large Different scenarios such as large-scale energy storage. However, affected by the need for safety performance upgrades in related fields, as the core component of power systems in these fields, the safety of lithium-ion batteries has attracted widespread attention inside and outside the industry. Especially in the field of large-scale energy storage applications, when the thermal runaway of lithium-ion batteries causes fires, explo...

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Problems solved by technology

The most widely used contact measurement is thermal resistance and thermocouple temperature measurement. Both of them are point temperature measurement. The temperature measurement is carried out by single point contact with the measured object, which can only reflect the temperature of a certain point of the object.

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