SOP prediction system and method based on electrothermal coupling battery model, and storage medium

Abstract

The invention discloses an SOP prediction system based on an electrothermal coupling battery model. The system comprises an SOP prediction module, an equivalent circuit model calculation module and a battery thermal model calculation module which are in communication connection with one another, wherein the equivalent circuit model calculation module is used for determining output voltage UL and heat production quantity Q according to an equivalent circuit model, charging and discharging current IL and battery average temperature T; and the battery thermal model calculation module is used for determining the average temperature T of the battery according to the battery thermal model, the heat production quantity Q and the environment temperature Tf. The invention further discloses a prediction method of the SOP prediction system based on the electrothermal coupling battery model, the output voltage is obtained according to coupling solution of the equivalent circuit model calculation module and the battery thermal model calculation module, and then the maximum charging and discharging current of the battery is obtained according to the battery voltage constraint module, the battery temperature constraint module and the battery SOC constraint module. Therefore, the SOP of the battery at the next moment is predicted, and the prediction accuracy of the SOP of the battery is improved.

Description

Technical field [0001] The present invention relates to the field of power cell technology, in particular to a SOP prediction system based on an electrothermal coupling battery model and a prediction method thereof, a storage medium. Background technique [0002] In order to ensure the safety of the battery, improve the battery life, the battery energy must be effectively managed. As the basis of the battery management system, the accurate estimation of the battery status is very important, directly related to the optimization of the vehicle control strategy. In order to ensure accurate estimation of the battery status, the precise battery model is important. STATE OF POWER, SOP as a measure of battery instantaneous power performance, can provide the battery to release maximum power in the next time period, and provide a basis for the energy management strategy of the battery management system. . At the same time, accurate peak power estimation can exert the maximum power of the ...

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Problems solved by technology

[0004] In terms of SOP calculation, the battery manufacturer usually obtains the SOP based on the two-dimensional look-up table of battery power SOC and battery temperature through experiments and tests. The SOP table provided by the battery manufacturer is generally obtained by testing the battery in a new state. , the charge-discharge cycle increases, and the battery performance gradually decays. At this time, it is obviously inaccurate to use the battery SOP table in the new state, so this method cannot be used for the SOP calculation of the battery life cycle.

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