BYD’s 1.5 MW “Flash” Charging Wasn’t A Gimmick. The Battery Chemistry Behind It Could Change The Industry.

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Earlier this week, fellow CleanTechnica writer Larry Evans covered the raw numbers behind BYD’s new 1.5-megawatt Flash Charging system. You can read his full breakdown of the hardware and infrastructure rollout here. He did a great job detailing the insane peak power and the clever grid buffer stations BYD is building to support it.

But there is a secondary story buried in those numbers that deserves a much closer look. The real magic isn’t just the peak power. It is what this technology means for the future of battery pack sizes and vehicle design.

Passenger Cars and Non-Towing SUVs Can Get By On Smaller Battery Packs

When you look at the charging curve data coming out of the launch event, it completely defies how we are used to seeing EVs behave. A compatible vehicle can go from a 10 percent state of charge to 70 percent in just five minutes. That alone is staggering. But the truly disruptive metric is that it can reach 97 percent in just nine minutes.

In traditional EVs, the charging speed falls off a cliff once the battery hits 70 or 80 percent to protect the cells from overheating. The new second generation Blade Battery architecture basically ignores this rule. Taking just four additional minutes to push that last 27 percent into the top of the pack means the charging curve stays incredibly flat and high deep into the session without hitting thermal throttling limits.

I’ll skip the full details on how BYD achieved this for now, but in short, engineers rethought battery cells and chemistry from the ground up to focus on speed and power input. 1.5 MW charging stations have been around for a while (mostly for trucks), but getting a smaller battery pack to soak that kind of energy in without starting a nasty lithium battery fire is the truly important achievement here.

This flat curve unlocks the true “killer app” for the next generation of electric vehicles: It allows automakers to put significantly smaller battery packs in commuter cars while still offering a gas car experience.

If a driver can pull over, plug in, and add 200 miles of range in the exact same five minutes it takes to pump a tank of gas, the entire justification for lugging around a heavy and expensive 100 kWh battery disappears. Automakers could start building lightweight and truly affordable EVs with 50 or 60 kWh packs that still offer a flawless road trip experience, assuming the infrastructure is in place.

Because there’s no longer any need to stop at 80%, or to stop at 60% to maximize charging speeds, using almost the full pack between charging stops actually starts to make sense. This can save the industry and EV buyers heaps of cash while making sure there’s plenty of production capacity to go around for others.

Truck Packs Will Stay Big, But It’ll Matter A Lot Less

Then you have to consider what this math means for heavy electric trucks. Right now, pulling a travel trailer cross country requires a massive battery. A truck like the Chevrolet Silverado EV LT (my truck) has a giant 170 kWh pack to handle the massive energy drain of towing. But that large pack actually becomes a huge advantage when paired with a 1.5-megawatt charger. Because the pack is so large, pushing that much power into it results in a lower C-rate per individual cell compared to pushing that same power into a small sedan. The thermal load is spread out over a much larger area.

If a truck with a pack that size (made with the improved cells, of course) could communicate with a 1.5-megawatt Flash Charger, a driver could theoretically dump 100 to 120 kilowatt-hours of energy into the vehicle in roughly 10 to 15 minutes. You could pull into a truck stop with an empty battery and a heavy travel trailer on the hitch, use the restroom, grab a coffee, and walk back out to a truck that is ready to tow for another two or three hours. It completely deletes the charging penalty for heavy towing.

Pack sizes will have to stay big to keep enough energy to go the distance, but a lot less time can be spent at the “pump.” Add in pull-thru charging at the truck stops and travel centers made for this, and there’s almost no reason to favor ICE over EV for towing.

We have spent years assuming the only way to get more range and faster charging was to build bigger and heavier batteries. BYD is proving that with the right cell chemistry and a flat charging curve, less can actually be a whole lot more. This could end up being a bigger game changer for the industry than most think.

Featured image: A BYD Flash Charging Station, by Yi Chen on Xiaohongshu