A quasi-steady-state measurement method and test device for cylindrical battery thermal parameters

Abstract

The invention relates to a quasi-steady-state measuring method and testing device for thermal parameters of a cylindrical battery. A cylindrical heater is placed in the hollow part of the mandrel of the cylindrical battery to measure the radial thermal conductivity and specific heat of the cylindrical battery; the cylindrical heating The device includes an insulating column, a heating wire, a hollow steel shell, an insulating tape, and a thermocouple. Wrap the heat insulating material around the battery to be tested, and stick a thermocouple on the outer wall of the cylindrical battery shell and the heat insulating material, place the battery to be tested in a temperature control box for heating, and determine the accuracy according to the temperature rise rate inside and outside the cylindrical battery. In the steady-state stage, the radial thermal conductivity and specific heat of the cylindrical battery are obtained based on the quasi-steady-state principle. The test device used for measuring the thermal conductivity of cylindrical batteries in the present invention has the advantages of simple structure, short measurement time, accurate test results, low cost and easy implementation. It can be used to measure the radial thermal conductivity and specific heat of cylindrical batteries under different working conditions.

Description

technical field [0001] The invention relates to a quasi-steady-state measuring method and testing device for thermal parameters of a cylindrical battery, and belongs to the technical field of thermal physical parameters and thermal management of energy storage batteries. Background technique [0002] With the increasing global energy crisis and environmental pollution, people pay more and more attention to the development of energy storage and power batteries. Cylindrical batteries, mainly lithium-ion batteries, have become one of the ideal energy storage batteries for consumer electronics and electric vehicles due to their high power density, good consistency, and low self-discharge rate. However, the high-rate charging and discharging of cylindrical batteries will generate more heat during operation. If it is not dissipated in time, it will easily lead to the decline of battery capacity and life, and even induce thermal runaway of the battery. As the service life increase...

AI Technical Summary

Problems solved by technology

This method cannot directly measure the radial thermal conductivity and specific heat of cylindrical batteries, and the experimental results must be tried and tested through simulation software, which takes a long time to calculate and is difficult to measure.

Due to the difference between the built battery heat transfer model and the real structural state of the battery, the direct measurement of the real thermal parameters of the battery has not been realized, so the measurement accuracy is difficult to guarantee

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