Fast test method for interface thermal resistance of single power cell

Abstract

The invention discloses a fast test method for an interface thermal resistance of a single power cell. The method comprises: S10, a testing device is arranged in a constant-temperature environment in a suspension mode; S20, a heating unit emits heat to heat single power cells; S30, a thermodetector tests temperatures of an A point and a B point, wherein the A point is a left side central point of a heat conduction unit and the B point is a right side central point of one single power cell at the right side; and S40, when the temperatures of the A point and the B point become stable, power consumption of the heating unit and the difference value of the temperatures of the A point and the B point are calculated, and an interface thermal resistance is calculated based on the difference value of the temperatures of the A point and the B point and the power consumption of the heating unit. According to the invention, the test method can be implemented simply, conveniently, and rapidly. The interface thermal resistances, including the interface thermal resistances of one single power cells with different service lives, of single power cells can be tested at different temperatures and under different pressures according to needs.

Description

technical field [0001] The invention relates to a test method for a power battery cell, in particular to a rapid test method for the interface thermal resistance of a power battery cell. Background technique [0002] With the development of new energy vehicles, the safety of power batteries has received more and more attention. The safety problems of power batteries are mainly caused by thermal runaway. Therefore, the thermal management technology of power batteries has developed rapidly, and the research on heat conduction of power batteries has become a recent hot spot. The interface thermal resistance of the power battery is greatly affected by the process and materials, and occupies a large proportion in the heat conduction process of the power battery. How to quickly test the interface thermal resistance becomes more and more important. [0003] Most of the traditional interface thermal resistance test methods require more complicated test instruments, and the test met...

AI Technical Summary

Problems solved by technology

[0003] Most of the traditional interface thermal resistance test methods require more complex test instruments, and the test methods are also more complicated

At present, in the research on the heat conduction technology of power batteries, the interface thermal resistance is reduced qualitatively through structure or material design, and there is no quantitative test method yet.

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