Battery equivalent mechanical model for soft package lithium ion battery thickness estimation and modeling method thereof

Abstract

The invention provides a battery equivalent mechanical model modeling method for soft package lithium ion battery thickness estimation, and belongs to the technical field of battery state estimation.The method comprises the steps: establishing a battery equivalent mechanical model to predict battery dynamic thickness change caused by battery external pressure change; further establishing the battery equivalent mechanical model in a constraint state, and through the relation between the inter-battery pressure and the battery dynamic thickness and the static thickness under the constraint of abattery pack shell, converting the inter-battery pressure into the battery static thickness directly corresponding to the battery state, and providing a model basis for design and optimization of a battery state estimation method based on the inter-battery pressure. The model built by the modeling method has the advantages of being simple in structure and small in calculated amount while the accuracy is guaranteed, and model parameter calibration and practical application are greatly facilitated.

Description

technical field [0001] The invention belongs to the technical field of battery state estimation, and in particular relates to a battery equivalent mechanical model modeling method aimed at estimating the thickness of a soft-pack lithium-ion battery. Background technique [0002] As an important part of the power system of electric vehicles, lithium-ion batteries need to be precisely managed to improve the performance of the battery system and avoid the risk of failure. Battery state of charge estimation (SOC, State of Charge) and battery state of health estimation (SOH, State of Health) are the key to battery management, and are crucial to reflecting internal information of the battery, ensuring the normal operation of the battery system and improving the performance of the battery system role. [0003] Most of the existing battery state estimation methods implement state estimation through voltage, current and temperature signals. The inter-battery pressure signal has rece...

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of battery equivalent mechanical model and its modeling method for the thickness estimation of soft pack lithium-ion battery, to solve the problem of neglecting the The intermediate variable of battery thickness directly estimates the battery state, which leads to the problem of poor accuracy and portability of the estimation method

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