Control of the current in parallel-connected battery strings

摘要

A battery assembly has a first battery string having a first plurality of series connected cells. A second battery string is connected in parallel with the first battery string and includes a second plurality of series connected cells. A fluid channel is operatively connected to the first and second battery strings and includes a liquid flowing therein. A controller is operatively connected to the first and second battery strings. The controller is configured to determine a desired temperature difference between the first and second temperature of the battery strings based at least in part on a corresponding state of charge of the first and second battery strings. The controller is configured to control the first and second current levels through the fluid in the fluid channel based at least in part on the desired temperature difference.