Lithium ion battery thermal management system and method based on movable fins and phase change material

Abstract

A lithium ion battery thermal management system and method based on movable fins and a phase change material can perform thermal management on the operation of the lithium ion battery according to different working temperatures of the lithium ion battery: when the lithium ion battery works at medium temperature, the battery temperature reaches the melting point of the phase change material, and the phase change material converts the battery heat into self latent heat for storage through solid-liquid phase change; after the phase change material is completely liquefied, the heat management system drives the fins to make contact with the surfaces of the single batteries, and high-temperature heat dissipation is carried out through heat conduction of the fins and convection of surrounding refrigerants under the assistance of heat absorption of the liquid phase change material; when the battery stops working and the temperature of the battery begins to drop and is close to the melting point of the phase change material, the heat management system folds the fins back to separate from the surface of the single battery, so that the external dissipation of heat in the phase change material and the battery is slowed down, and the temperature drop of the battery pack in a low-temperature environment is prevented from being too fast. The design can effectively ensure that the lithium ion battery obtains ideal operating temperature and surface temperature difference at different working temperatures.

Description

technical field [0001] The invention relates to the technical field of battery thermal management, in particular to a lithium-ion battery thermal management system and method based on movable fins and phase change materials. Background technique [0002] At present, the operating temperature and surface temperature distribution of lithium-ion batteries will have a great impact on its performance and life, which is directly related to the operating cost and stability of related electric vehicles. Therefore, the normal use and safe operation of such batteries have high requirements on their operating temperature. Specifically, a complex electrochemical reaction occurs inside the lithium-ion battery during the charging and discharging process, causing a large amount of heat to be generated rapidly inside the lithium-ion battery, which pushes up the battery temperature, resulting in a decline in battery performance. For example, if the battery is repeatedly charged at an ambien...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects in the prior art, the present invention provides a lithium-ion battery thermal management system and method based on movable fins and phase-change materials, which solves the problem that the existing lithium-ion battery thermal management system cannot take care of the lithium-ion battery at high and low temperature. Technical Problems of Different Heat Requirements for Medium and Low Temperature Operation

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