Polestar and Breathe Battery Technologies have detailed how adaptive battery software complements the Polestar 3’s new 800-volt electrical architecture to deliver faster, more consistent DC fast charging. The combination enables a 10–80% charge in as little as 22 minutes at compatible 350 kW chargers, with Breathe Charge software contributing up to 38% more range in a 10-minute session compared to charging without the software active.
Highlights
- Polestar 3’s 800V architecture supports peak DC charging at 350 kW, completing a 10–80% charge in approximately 22 minutes.
- Breathe Charge adaptive software monitors battery condition in real time and adjusts charging speed moment by moment to optimize performance.
- A 10-minute charging stop with Breathe Charge active adds up to 38% more range versus the same session without the software.
- Testing data shows Breathe Charge matches warm-weather charging performance even in cold conditions.
800-Volt Architecture Overhaul
The 800V upgrade to the Polestar 3 involves extensive component changes across the vehicle’s SPA2 platform, developed by Volvo Cars. New batteries, motors, inverters, cable harnesses, and routing have all been redesigned for the higher-voltage system.
Operating at 800 volts reduces energy losses compared to traditional lower-voltage architectures. That efficiency gain lowers thermal stress on components and minimizes the need for oversized cabling, according to the companies.
“The extensive upgrade to an 800 Volt electrical architecture, coupled with cutting-edge battery software, delivers true added value and usability to Polestar 3 drivers thanks to faster charging that is among the best in its segment,” said Michael Lohscheller, CEO of Polestar.
How Breathe Charge Works
Breathe Charge is an adaptive battery management software deployed on the Volvo Cars SPA2 platform. Rather than applying a static charging protocol, the software runs a real-time simulation of the battery’s internal state, continuously monitoring its condition and adjusting charging speed moment by moment.
This approach balances two priorities: maximizing charging speed while preserving long-term battery health. The result is a 10–80% charge in 22 minutes at compatible 350 kW DC chargers, with the software responsible for extracting additional performance beyond what the hardware alone would deliver.
Breathe Battery Technologies, which spun out of Imperial College London in 2019, developed the software. The company’s partners include Volvo Cars, OPPO, and Bang & Olufsen.
Cold-Weather Charging Performance
One of the more notable claims involves cold-weather charging consistency. Breathe Battery Technologies says its software enables Polestar 3 drivers to add comparable range during a 10-minute session at low temperatures as they would achieve without Breathe Charge under optimal temperature conditions.
“The key benefit to Polestar 3 drivers with Breathe Charge is that it improves charging performance and consistency in all real-world conditions – notably also in cool weather circumstances,” said Dr. Yan Zhao, CEO at Breathe Battery Technologies. “Testing data shows that our software enables Polestar 3 drivers to add as much range during a 10-minute charging session at low temperatures as they would charging without Breathe Charge in an optimal temperature range.”
Cold-weather range loss and slower charging remain among the most common concerns for EV owners. If the testing data holds in independent verification, the technology could address a persistent pain point for drivers in northern climates. The Volvo ES90, built on the same SPA2 platform, also uses Breathe Battery Technologies’ adaptive charging software.
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