For many applications contactor mass doesn’t matter, but for aviation every gram counts and hence we wanted to look for a trend.
Contactor mass plotted versus continuous current rating.
Not very much data with just 23 parts, but it appears that we are seeing distinct masses based on frame size.
Hence a relationship to continuous current, but not a very clear relationship.
This suggests we have a base mass of 150g and then an increment of 1g/A, based on the equation and looking at the graph this is a first reasonable relationship to use for a pack mass estimating tool.
Battery pack mass estimation is a key parameter required early in the conceptual design. There are a number of key reasons for estimating the mass, one of the main ones being the significant percentage it is of the overall mass of the complete system.
This calculator uses the cell mass and an estimation for everything else based on a fit to our pack database.