CPC H01M 10/486 (2013.01) [H01M 10/425 (2013.01); H01M 10/625 (2015.04); H01M 10/6572 (2015.04); H01M 50/20 (2021.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] | 10 Claims |
1. A method for diagnosis of a temperature control means (30) of a battery pack (10) that comprises a plurality of battery cells (20) and a plurality of temperature sensors for measuring temperatures of the individual battery cells (20),
the battery cells (20) being arranged side by side in the battery pack (10), in a longitudinal direction (12) of the battery pack (10), and connected to each other, the battery cells (20) being arranged on the temperature control means (30) and connected to the temperature control means (30), wherein the connection includes a thermal connection,
the method comprising the following steps:
determining a reference temperature distribution of the battery pack (10) in the longitudinal direction (12) of the battery pack (10);
measuring the temperatures of the individual battery cells (20) during operation of the battery pack (10) when the temperature control means (30) is switched on, and forming an actual temperature distribution of the battery pack (10), in the longitudinal direction (12) of the battery pack (10), on the basis of the measured temperatures of the individual battery cells (20);
comparing the actual temperature distribution with the reference temperature distribution and forming a profile of a difference between the actual and the reference temperature distribution; and
identifying an ineffective temperature control state of the temperature control means (30) based on the difference between the actual and the reference temperature distribution exceeding a predefined threshold value.
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