Battery thermal parameter identification method based on dimensionless model

Abstract

The invention provides a battery thermal parameter identification method based on a dimensionless model, and belongs to the technical field of batteries. The method comprises the following steps of bonding two same battery samples by using a heating sheet; establishing a dimensionalized heat transfer model for the battery sample and carrying out non-dimensionalization; respectively arranging a plurality of thermocouples on the non-contact surfaces of the two battery samples and the heating sheet; and after the heating time is determined, heating the heating sheet to obtain a battery temperature curve corresponding to the position point of each thermocouple on the two battery samples, and optimizing the dimensionless heat transfer model to finally obtain a thermal parameter identification result of the battery samples. According to the method, the thermal parameters of the battery are rapidly identified while the identification precision is ensured, and the identification efficiency isimproved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for identifying battery thermal parameters based on a dimensionless model. Background technique [0002] Lithium-ion battery is a strongly thermo-electrochemical coupling system, and battery temperature will greatly affect its electrochemical performance. The battery heat transfer model can be used to analyze the thermal characteristics of a single battery, which is helpful for the analysis and research of lithium-ion battery heat-related issues. [0003] The accuracy and efficiency of the simulation model is the key to the analysis of the model. For the heat-related field of lithium-ion batteries, an important factor affecting the accuracy of the heat transfer model is the accuracy of battery thermal parameter identification. Thermal parameter identification methods are mainly divided into theoretical and experimental methods: theoretically, the thermal ...

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Problems solved by technology

Carry out two experiments, and through the simulation calculation of the dimensional heat transfer model, the whole parameter identification process is complicated, time-consuming and inefficient, and the two experiments may introduce large measurement errors

[0005] For problems in the field of thermal parameter identification of lithium-ion batteries, the traditional dimensional heat transfer model has many parameters, which requires a large number of calculation cases and low efficiency. However, the solution given by the above-mentioned existing technical solutions needs to be divided into two experiments Obtaining battery thermal parameters is a long process, takes a long time, and is easy to introduce more errors, resulting in a decrease in accuracy. Therefore, a method is needed to divide cases of the same nature into a set, and improve the analysis problem while ensuring the accuracy of battery thermal parameter identification. , Identify the efficiency of battery thermal parameters

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