Method for predicting internal temperature of battery in real time

Abstract

The invention provides a method for predicting the internal temperature of a battery in real time, and relates to the real-time prediction methods for the battery. The problem that the actual internal working temperature of the battery can not be embodied by battery surface temperature monitoring is solved. According to the method, the battery is divided into an inner core and an outer shell, temperature prediction models are established respectively, the specific heat capacity of the internal material and the surface material of the battery, the thermal-resistance parameter of the inner core-outer shell of the battery, the thermal-resistance parameter of the outer shell-the outside of the battery, the open-circuit voltage curve of the battery, the curve of the open-circuit voltage variation with temperature and the like are acquired by an experiment method. A Kalman filtering method is used for tracking and correcting the internal temperature of the battery in real time, real-time battery surface and environment temperatures are input into the predication models, and the internal temperature of the battery is predicted in real time. The method is suitable for predicting the internal temperature of the battery in an electrical automobile and an energy storage system.

Description

technical field [0001] The invention relates to a method for real-time prediction of battery internal temperature by using battery surface and ambient temperature. Background technique [0002] A complex electrochemical reaction occurs inside the power battery during charging and discharging, and due to the existence of entropy change and internal resistance, heat is generated during use. Battery performance such as capacity, lifespan, and internal resistance are easily affected by the core temperature of the battery, which is also the most direct manifestation of thermal runaway and internal faults. However, the currently applied battery temperature monitoring system can only monitor the surface temperature of the battery, and it is generally impossible to embed sensors inside the battery to monitor the internal temperature of the battery. This method will also bring potential safety hazards. However, there is a lag in the transfer of heat from the battery core to the batt...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the actual problem that the internal temperature of the battery cannot be monitored in real time when the battery temperature is monitored. The present invention provides a real-time prediction method for the internal temperature of the battery to solve the problem that the surface temperature monitoring of the battery cannot reflect the actual working temperature inside the battery and avoid the normal surface temperature. And the occurrence of internal over-temperature phenomenon, so as to ensure the reliable and stable operation of the battery pack

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