Lithium-ion battery thermal management method based on movable fins and phase change materials

Abstract

A lithium-ion battery thermal management method based on movable fins and phase-change materials, which can perform thermal management on its operation according to different operating temperatures of lithium-ion batteries: that is, when a lithium-ion battery works at a medium temperature, the battery temperature reaches the temperature of the phase-change material. Melting point, the phase change material converts the heat of the battery into its own latent heat storage through solid-liquid phase transition; when the phase change material is fully liquefied, the thermal management system drives the fins to make contact with the surface of the battery cell, conducts heat through the fins and Refrigerant convection, supplemented by liquid phase-change material to absorb heat for high-temperature heat dissipation; when the battery stops working and the battery temperature begins to drop and approaches the melting point of the phase-change material, the thermal management system retracts the fins to separate them from the surface of the battery cell , which slows down the external dissipation of the phase change material and the internal heat of the battery, and prevents the battery pack from dropping too quickly in a low temperature environment. This design can effectively ensure that the lithium-ion battery can obtain an ideal operating temperature and surface temperature difference under different operating temperatures.

Description

technical field [0001] The invention relates to the technical field of battery heat management, in particular to a lithium-ion battery heat management 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 ambient temperature of ...

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 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 high, medium, and Technical issues of different heat demands when working at low temperatures

Images