Contactor Mass

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 post has been built based on the support and sponsorship of: AVANT Future MobilityQuarto Technical ServicesTAE Power Solutionsh.e.l group and The Limiting Factor. 

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

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.

Contactors: The Basics

 by Eymen Ipek

Contactors are electromechanical switches. They control the connection of battery Cells to the external electrical circuit. A contactor has an electromagnetic circuit. It simply works like a solenoid to push moving contact [1]. Therefore, contactors have two different electrical circuits inside: one is for actuation and the other one is to carry currents during the switch-on state.

There are two main types of contactors: Normally Open (NO) and Normally Closed (NC). A NO contactor does not allow current to flow when the actuation circuit is not powered. However, an NC contactor connects the external circuit when the contactor actuation coil is not energized. Therefore, we use EV contactors as NO to switch off the circuit in case of loss of actuation circuit supply.

Continue to article to read more.

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