Tesla patents trailer battery system for increased EV range

Tesla is still exploring ways to boost the range of its electric vehicles, and has patented an unusual solution involving an extra battery. This battery wouldn't necessarily be housed in the car itself, but could be placed in a separate trailer.

Dual Batteries and Smart Management

The system operates with two batteries: a main 800V unit and an auxiliary 400V unit. They are connected via converters and managed in several modes to distribute energy efficiently.

While driving, the electronics balance the discharge so both batteries are used evenly. Before fast charging, the system equalizes the voltage, allowing both batteries to charge simultaneously.

The Trailer Battery: A Key Idea

The most interesting aspect is the placement of the extra battery in a trailer. This avoids sacrificing interior cargo space, which was the main drawback of Tesla's earlier idea for a battery in the Cybertruck's cargo bed.

This approach is particularly useful for towing and long trips, where electric vehicle range often drops sharply. If needed, the trailer can simply be detached.

Technology and Limitations

The patent also describes a thermal regulation system that uses heat from the electronics to warm the battery. This improves efficiency in cold weather without needing a separate heater.

However, for now, this remains just a patent. Tesla has already abandoned a simpler version of a range extender, highlighting the implementation challenges despite the interesting engineering concept.