Cooling-fin cylindrical battery pack heat dissipation device and method employing composite phase changing material

Abstract

The invention discloses a cooling-fin cylindrical battery pack heat dissipation device and method employing a composite phase changing material. A cooling fin comprises a main fin and auxiliary fins,wherein the main fin is of a fully-closed shell structure, a phase changing material is packaged in the main fin, the auxiliary fins are expanded towards two sides from a surface of the main fin, andtail ends of the auxiliary fins are in tangential contact with the surface of a battery. Cylindrical batteries in different specification sizes can be adapted by adjusting the size and the distance ofthe fins and the thickness of the phase changing material, and the heat dissipation and the heat preservation performance requirement is met. A fixed base is arranged at the bottom of a battery pack,the battery pack can be reinforced, the shock resistant capability is improved, a fan can be externally connected to improve convection, and the heat dissipation and heat preservation effect is improved. By the heat dissipation device, the advantage of the phase changing material is fully utilized, the temperature uniformity of the battery pack is improved, light requirement is conformed, thermaldisaster is prevented from propagating in a battery stack, the thermal safety of the battery pack is improved, and the heat dissipation device can be widely applied to various fields of automobile and aerospace.

Description

technical field [0001] The invention relates to the field of thermal management of electric vehicle lithium battery packs, in particular to a cylindrical battery pack heat dissipation device and method using heat dissipation fins of composite phase change materials. Background technique [0002] Lithium batteries are widely used in electric vehicles, and always work in the form of battery modules and battery packs to output electric energy. Among them, thermal management is a key part of the battery management system. Effectively enhancing the heat dissipation and heat preservation of the battery pack and reducing the complexity of the thermal management system is an important part of the thermal management technology design of the battery pack. [0003] Cylindrical lithium batteries have high energy density and power density, and good monomer consistency, which is the mainstream of the development trend of lithium batteries today. In the cylindrical lithium battery module,...

AI Technical Summary

Problems solved by technology

[0005] Today, lithium battery packs generally use liquid cooling for heat dissipation and heat preservation. Although it is convenient for electronic control, the additional pipelines, hydraulic pumps and other devices increase the weight of the battery pack, which poses a challenge to lightweight design. At the same time, due to the liquid The flow causes temperature changes upstream and downstream, which will increase the temperature difference of the battery pack, which is not conducive to the overall performance of the battery pack

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