Low temperature state-of-charge correction for a mixed chemistry battery

A vehicle comprising:

• a mixed chemistry battery comprising:
• a first battery cell having a first chemistry;
• a second battery cell having a second chemistry that is different than the first chemistry, wherein the first battery cell is connected to the second battery cell in series;
• and
• a battery monitoring system configured to:
• obtain a first SOC of the first battery cell and a second SOC of the second battery cell and based on a determination that an absolute value of a difference between the first SOC and the second SOC is greater than a threshold value:
• obtain a first capacity retention rate for the first battery cell and a second capacity retention rate for the second battery cell;
• and
• update the second SOC based on the first SOC, the first capacity retention rate, and the second capacity retention rate.

A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform operations comprising:

• obtaining a first SOC of a first battery cell connected to a second battery cell in series, wherein the first battery cell has a first chemistry and the second battery cell has a second chemistry that is different than the first chemistry;
• obtaining a second SOC of a second battery cell;
• and
• based on a determination that an absolute value of a difference between the first SOC and the second SOC is greater than a threshold value:
• obtaining a first capacity retention rate for the first battery cell and a second capacity retention rate for the second battery cell;
• and
• updating the second SOC based on the first SOC, the first capacity retention rate, and the second capacity retention rate.