Abstract: A device is provided that measures an overall generated heat flow rate released by a battery cell The device comprises an electrical power source for charging and discharging the battery, an internal temperature sensor placed inside the battery, a surface temperature sensor placed on the surface of the battery cell, and an ambient temperature sensor placed in the ambient environment. The device also includes a memory that records the temperatures, and a processor. The processor computes characteristic thermal attributes of the battery cell based on a predetermined thermal equivalent circuit of the battery, using temperatures recorded over a predetermined calibration time period, during which the battery is subjected to current emitted by the electrical power source. The processor then computes the heat flow rate generated by the battery cell towards its ambient environment from a set of recorded temperatures and the thermal attributes of the battery cell.

Abstract: The invention relates to a method for in-life testing of the formation of the solid electrolyte interface layer of a battery cell, comprising the following steps: sensing the temperature within the battery cell, recording a first set of temperature (T) and/or pressure data related to the temperature variation (?T) and/or pressure variation within the battery cell over a first charge of the battery cell, and determining a positive or negative datum relating to the formation of solid electrolyte interface layer of the battery cell according to said first set of temperature and/or pressure data

Abstract: A method for selecting between a first battery cell and a second battery cells includes sensing a total generated heat flow rate emitted by the first battery cell and the second battery cells. The method further includes recording, for the first and second battery cells, first and second sets of heat flow rate data related to the total generated heat flow rate emitted by the first and second battery cells, respectively, over their first charge. The method further includes comparing the first set of heat flow rate data with the second set of heat flow rate data, and selecting one of the first or second battery cells according to the comparison between the first set of heat flow rate data with the second set of heat flow rate data.