Device and method for testing heat conductivity coefficient of lithium ion battery

The invention relates to the field of battery testing, in particular to a lithium ion battery heat conductivity coefficient testing device and a lithium ion battery heat conductivity coefficient testing method. The method adopts the device for testing, and comprises the following steps: acquiring experimental temperatures acquired by the first thermocouple and the second thermocouple within a set time interval after the battery is heated to a quasi-steady state and after the quasi-steady state; building a simulation model; inputting a plurality of groups of battery heat conductivity coefficients into the simulation model, and obtaining a plurality of groups of simulation temperatures output by the simulation model; and determining the heat conductivity coefficient of the battery according to the experimental temperature collected by the second thermocouple and the plurality of groups of simulation temperatures. According to the invention, accurate, rapid and safe measurement of the heat conductivity coefficie