A new method to determine the heating power of ternary cylindrical lithium ion batteries with highly repeatable thermal runaway test characteristics

A new method to determine the heating power of ternary cylindrical lithium ion batteries with highly repeatable thermal runaway test characteristics is proposed based on statistical principles. By selecting the key parameters for the process of heating-triggered thermal runaway of a lithium ion battery, such as the heating time and thermal runaway temperature, the standard deviation coefficients in multiple tests are used as the basis for evaluating the repeatability and determining the heating power of the highly repeatable thermal runaway test results. A systematic experimental study of four typical ternary cylindrical lithium ion batteries is carried out and a method for calculating the heating power based on the rated energy and weight of the battery is proposed. The results show that this method could effectively ensure the repeatability of the thermal runaway test for cylindrical batteries. The method is simple, original and innovative for the selection of the thermal runaway heating power of ternary cylindrical lithium ion batteries. The results also serve as a reference to select the heating power for other types of lithium ion batteries.