Tesla Files Patents for Wireless Charging the Robotaxi
Tesla has filed four patents for wireless charging. Previously, Tesla acquired the experience and skills of Wiferion’s engineering team in an acquisition in June 2023. Tesla quickly sold off the company but kept the company’s engineers. This was an acqui-hire, where large companies rapidly onboard top talent by purchasing a company for human capital, rather than products, services, or intellectual products.
Following the Wiferion acquisition, Tesla showed off a wireless charging mat several times and even confirmed they are working on wireless inductive home charging. We expected this to arrive with the Cybertruck, but now we hope to see more details at the upcoming Robotaxi reveal event in October, at the Warner Bro.’s studio in Hollywood.
Wireless Charging Patents
First Patent
The first of the four patents looks at temperature sensors and applications for wireless charging. Tesla intends to track the temperatures across both the wireless charging pad, as well as the inductive charging coils in the vehicle. The third patent details how they’re planning to use this in an innovative way.
Second Patent
The second patent is a shorting switch, which is designed to prevent or reduce leakage of energy to ground sources near the wireless charging mat. This shorting switch is used to create a short with the receiving side of the inductive charging, essentially making energy transfer faster and more efficient – while also reducing the amount of energy that is leaked out elsewhere. We’ll leave this one for the electrical engineers to explain in our forums.
Third Patent
The third patent is actually the wireless charging circuit itself, and how to manufacture it. This one is straightforward and explains how Tesla intends to design and build the prototype inductive wireless charging mats. Beyond the basic design, this document also details how Tesla intends to lay out the inductive charging coils and how it expects the entire assembly to function – which includes a small cable that runs to a wall-mounted energy source.
Fourth Patent
The final patent is for intelligently estimating and adapting to variations in wireless charging layouts and systems. This one is probably the most interesting of the four patents, as it involves adjusting the coils in the mat to dynamically account for the positioning of the vehicle, as well as responding to the information from the first patent – the temperature sensors.
Essentially, by varying the coil induction across the mat, Tesla intends to dynamically aim the wireless charger at different parts of the inductive coils in the vehicle, thereby reducing heat. This patent will also help Tesla to determine the adequate charge speed and other key information they may need to relay to the vehicle, or back to fleet management software.
Cybertruck Inductive Charging
While the Cybertruck never actually arrived with inductive charging, it was noted in the Service Manual to have 2 Inductive Charging Headers, so it is ready to be upgraded to have Inductive Charging support. We expect that Tesla will release this as a purchasable upgrade for the Cybertruck sometime in the future – likely as a package with the Inductive Charging Mat.
Robotaxi Inductive Charging
The Robotaxi will likely be the first of Tesla’s vehicles to feature inductive charging – which. makes sense given its autonomous nature. Plugging in a NACS charger will likely be fairly difficult to automate, and the 5-10% efficiency loss of wireless charging isn’t a huge deal. It’s possible Tesla chose this route due to cost, as having an automated NACS cable like the “snake” prototype we saw years ago could be costly.
Having a simple parking stall with an inductive mat on it, alongside all the tech and supplies needed to automatically clean and sanitize the Robotaxi makes far more sense. This means that a Robotaxi will be able to roll in, charge and clean itself, and then roll out to go pick up more customers. Tesla is planning a super-efficient system here that requires minimal intervention from real humans.
Essentially, by effectively managing the Robotaxi fleet, Tesla can offset the increased time that wireless charging would take, and also reduce the amount of waste energy by charging when energy is cheapest. While this could prevent Tesla from taking advantage of the sheer battery mass of a Robotaxi fleet – by selling power when it’s expensive and travel demand is low – this doesn’t make it impossible.
Smartphone manufacturers have demonstrated reverse wireless charging with the inductive charging coils already present in modern smartphones. We could see Tesla low-power bi-directional charging in the future too.
We’re looking forward to seeing Tesla unveil this at the upcoming Robotaxi event. It’ll be something special, for sure.
