Method for testing anisotropic heat diffusion coefficient of power battery at same time
A technology of thermal diffusivity and power battery, applied in the direction of material thermal conductivity, material thermal development, etc., can solve the problems of large influence of test accuracy calculation model, poor recognition parameter accuracy, and inaccurate simulation model, so as to save the cumbersome process , the effect of improving accuracy and reliability
Active Publication Date: 2016-10-26
CHINA FIRST AUTOMOBILE
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The invention discloses a method for testing anisotropic heat diffusion coefficient of a power battery at the same time. The method includes following steps: S10, recording surface temperature of a power battery sample when the power battery reaches heat balance; S20, using a constant-temperature heating source which is already at the temperature of Tw to heat other surfaces perpendicular to the laminating direction of the power battery sample; S30, sampling temperature signals on a face where a heat-insulating clamp contacts with the power battery sample, wherein coordinate distribution of temperature testing points is (x1, y3, 0), (x2, y3, 0), (x3, y1, 0) and (x3, y2, 0), x2=mx1, y2=ny1, m>1, and n>1; S40, setting time when temperature of a certain testing point is increased to preset temperature as t, and reading temperature of other testing points according to t; S50, calculating anisotropic heat diffusion coefficient of the power battery sample in X, Y and Z directions. The anisotropic heat diffusion coefficient can be obtained by only collecting the surface temperature of the battery, and the troublesome processes of teating inside temperature of the battery and building a battery heat transfer model are omitted.
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