Passive phase-change material cooling system for power battery of electric automobile

Abstract

The invention relates to a passive phase-change material cooling system for a power battery of an electric automobile. The system comprises: one or more battery modules, wherein each battery module comprises a plurality of cells which are connected through welding of metal connection pieces; a battery box used for accommodating the one or more battery modules; a composite phase-change material which realizes storage and release of energy through reversible solid and liquid phase change of an included phase-change material; graphite flakes with high thermal conductivity; and a plurality of threaded fasteners used for fastening the box body. Compared with the prior art, the invention has the following advantages: the graphite flakes with high thermal conductivity and compressed expanded graphite are used as reinforcing heat transfer measures for the system; through combined usage of the graphite flakes with high thermal conductivity and the composite phase-change material, the cooling system has the beneficial effects of high heat transfer efficiency, a simple structure, small occupied space, good temperature consistency of a battery pack and a high energy utilization rate.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a passive phase change material cooling system for power batteries used in pure electric vehicles and hybrid vehicles. Background technique [0002] With the current energy crisis and environmental protection issues becoming more and more serious, it is urgent to find suitable substitutes for traditional cars. Electric vehicles (BEV) are recognized as one of the main development directions of the future automotive industry due to their high energy efficiency, environmental friendliness and non-pollution. As an essential power unit of electric vehicles, power batteries are one of the core technologies of electric vehicles. [0003] During the driving of an electric vehicle, the on-board power battery is continuously charged and discharged, which is accompanied by the generation of a large amount of heat. If the heat generated cannot be dissipated in time and effectively,...

AI Technical Summary

Problems solved by technology

This patent combines liquid cooling with phase change material cooling, which is innovative to a certain extent, but it still does not effectively overcome the shortcomings of liquid cooling such as complex flow channel structure, liquid leakage, and additional power consumption.

[0007] Therefore, the purpose of the present invention is to propose a new type of vehicle battery thermal management system that is different from traditional air cooling and liquid cooling, which can effectively overcome the problems of large mass and volume, liquid leakage, and uniform battery temperature caused by traditional battery thermal management methods. At the same time, it realizes timely and effective control of the battery temperature, and electric vehicles do not need to input additional energy to the battery thermal management system when driving within a short distance, so as to improve the effective output power of the on-board power battery

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