Battery internal temperature information processing method, computer equipment and storage medium

Abstract

The invention discloses a battery internal temperature information processing method, computer equipment and a storage medium. The method comprises the following steps of: constructing an equivalent thermal network model according to off-line test data of an off-line test of a battery module, and determining optimal model parameters of the equivalent thermal network model based on a multi-objective function fitting method; and determining a first battery internal temperature estimated value of the battery of a vehicle at the first moment of actual operation of the vehicle according to the obtained initial state vector value of the battery of the vehicle, the first operation data at the first moment of actual operation of the vehicle and the equivalent thermal network model containing the optimal model parameters. According to the battery internal temperature information processing method, the computer equipment and the storage medium of the invention, the internal temperature of the battery can be accurately estimated in real time, so that the working condition of the battery can be optimized according to the internal temperature of the battery which is accurately estimated in real time, and the safety of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of battery temperature, in particular to a battery internal temperature information processing method, computer equipment and a storage medium. Background technique [0002] As the power of new energy vehicles, there is a common phenomenon of temperature rise in the charging and discharging process, and the heat generation and heat dissipation inside the battery are uneven, so there is a temperature field distribution inside the battery, which causes a large temperature difference between the inside and outside of the battery. , especially in high power demand applications; however, in actual battery thermal management, the battery surface temperature can only be measured in real time on the outer surface of the battery, and the internal temperature of the battery cannot be measured in real time, and the internal temperature of the battery It has a significant impact on the performance of the battery and is ...

AI Technical Summary

Problems solved by technology

[0002] As the power of new energy vehicles, there is a common phenomenon of temperature rise in the charging and discharging process, and the heat generation and heat dissipation inside the battery are uneven, so there is a temperature field distribution inside the battery, which causes a large temperature difference between the inside and outside of the battery. , especially in high power demand applications; however, in actual battery thermal management, the battery surface temperature can only be measured in real time on the outer surface of the battery, and the internal temperature of the battery cannot be measured in real time, and the internal temperature of the battery It has a significant impact on the performance of the battery and is directly related to the safety performance of the battery. Therefore, battery thermal management, especially the estimation of the internal temperature of the battery, has become one of the key and most challenging parts of the battery management system

[0003] In the prior art, among the battery internal temperature estimation methods, the method of estimating the internal temperature of the battery based on the electrochemical impedance spectroscopy test has high requirements for the test system, so the actual vehicle cannot meet its test conditions; based on the internal temperature and The method of estimating the internal temperature of the battery by the functional relationship between the surface temperature, the obtained functional relationship has no actual physical meaning, and it is difficult to adapt to the accurate calculation of the internal temperature of the battery under various complex working conditions; the battery heat transfer model in the prior art will The surface is equivalent to a temperature point method, and the temperature of each point on the battery surface is considered to be the same. The disadvantage of this solution is that because the internal structure and external shape of the battery are not perfectly symmetrical, the heat transfer paths from the inside of the battery to all surfaces are not consistent. , so the temperature at different positions on the battery surface will also be different, so the surface temperature is equivalent to a point will make the final estimated battery temperature error is large

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