Cylindrical battery thermal parameter quasi-steady-state measuring method and device

Abstract

The invention relates to a cylindrical battery thermal parameter quasi-steady-state measuring method and device. A cylindrical heater is mounted inside the hollow part of the spindle of a cylindricalbattery to measure the radial thermal conductivity and the specific heat of the cylindrical battery, and the cylindrical heater comprises an insulating column, electric heating wires, a hollow steel case, an insulating tape and a thermocouple; a battery to be detected is wrapped outside by insulating materials, and the thermocouple is adhered to the outer wall of the case of the cylindrical battery and the outer wall of the insulating materials, then the battery to be detected is heated inside a temperature-controlled box, a quasi-steady-state stage is determined according to the temperature increase speed inside and outside the cylindrical battery, and the radial thermal conductivity and the specific heat of the cylindrical battery are calculated according to the quasi-steady-state principles. The cylindrical battery thermal parameter quasi-steady-state measuring device is simple in structure, short in measuring time, accurate to measuring results, low in cost and easy to implement and can be applied to measurement of the radial thermal conductivity and the specific heat of the cylindrical battery under different working conditions and at different temperatures.

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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