Sunday, May 3, 2015

BMS (Battery Management System)

Each cell needs to be individually monitored to protect them against over-current, over and under voltage, and estimating state of charge. That means I need 108 individual circuits, one wired to each cell in the pack. I decided to use the Elithion BMS (Lithiumate Pro) because it seemed to offer the most control.

The molded plastic tops of the Volt batteries prevent the typical BMS installation between the cells so I had to come up with an alternate method to physically secure the BMS circuit boards to the batteries. I will use the Chevy Volt's original BMS wiring harness to make the electrical connections to the individual cells.

prototype aluminum brackets to hold Elithion BMS circuit boards

BMS circuit layout

Fully wired 6-cell BMS carrier
6-cell BMS installed on battery module

wired 12-cell BMS carrier

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