| CPC G01K 11/06 (2013.01) [G01J 5/00 (2013.01); H01M 10/482 (2013.01); H01M 10/486 (2013.01); G01J 2005/0077 (2013.01); H01M 2220/20 (2013.01)] | 20 Claims |

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1. A battery monitoring system comprising
a battery pack with a plurality of battery cells;
one or more portions, configured in connection with the battery cells, of a phase change material, PCM, having a phase change temperature, wherein each battery cell of the plurality of battery cells is in thermal contact with the PCM, such that a local phase change occurs in the PCM when the PCM is heated by an adjacent battery cell to or above said phase change temperature;
at least one phase change recognition device configured to detect said local phase change of said PCM, and
a control unit communicatively coupled to said phase change recognition device, the control unit configured to
impart an electrical load on said battery pack such that functional battery cells of the plurality of battery cells heat the PCM locally to or above said phase change temperature, and
determine a respective state of each battery cell of the plurality of battery cells based on a detected presence or absence of said local phase change detected by the phase change recognition device in response to the imparted electrical load.
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