QuantumScape Wants Its Solid-State Batteries Inside AI Server Racks

So basically: QuantumScape, the company best known for solid-state batteries for electric cars, is pitching them for AI data centers now. Its new design, called the QS PowerBlock, sits right inside server racks as backup power. The company says it beats an industry standard by a lot. It goes on display next week at a major data center hardware show.

What it is

The QS PowerBlock is a reference design, not a product you can order yet. Think of it as a blueprint that power companies and data center builders can adapt.

It uses QuantumScape’s solid-state lithium-metal cells. It can fit into different module, shelf, and rack formats. And it is built for 800-volt DC power, which is where next generation AI racks are heading.

The numbers they are claiming

QuantumScape compared it to a spec from the Open Compute Project, the group that sets open hardware standards for data centers. In a demo using a simulated AI training workload, the company says the PowerBlock showed:

• 4x the power density, so more backup power in less space
• 5x the runtime, so more time to ride out power swings
• Better heat tolerance, with cells staying stable above 300°C in testing, compared to about 180°C where regular lithium-ion cells can go into thermal runaway

One important catch. QuantumScape says these results come from prototype testing and modeled setups under controlled conditions. Real world performance will depend on the final design.

Why AI racks need batteries

AI training does not draw power smoothly. Thousands of chips spike and drop together. That puts stress on the power system and the grid.

Batteries inside the rack can smooth those swings and keep things running through short outages. As single racks head toward 1 megawatt, which is roughly what hundreds of homes use, that job gets a lot bigger.

Right now most of those in-rack batteries are regular lithium-ion. A fire inside a rack full of very expensive chips is a nightmare, so safety is a big selling point.

What the 800 volt part means

Most racks today run on lower voltage power. Moving to 800 volts DC means less current for the same amount of power. Less current means thinner copper, less wasted heat, and more room for chips.

Nvidia has been pushing the industry toward 800 volt power for its biggest AI systems. Any battery that wants a spot in those future racks has to work at that voltage from day one, which is why QuantumScape is leading with it.

Where you will see it

The PowerBlock will be shown at the 2026 OCP Global Summit, Oct. 12 to 15 at the San Jose Convention Center. It will be at the booth of Megmeet, a power equipment company that is a partner in Nvidia’s MGX ecosystem.

QuantumScape also joined the Open Compute Project as a member.

Why it matters

For years, QuantumScape has been all about cars. Its whole story was a solid-state battery that charges faster and holds more energy than what is in EVs today.

Data centers could be a quicker market. They pay a premium for safety and density, and they are spending huge money right now. A battery that is expensive for a car might make sense next to a rack of AI chips.

My take

I like this move. Car makers are slow and careful, and data centers are moving fast with a lot of money. If QuantumScape can get its cells working in racks first, that could help pay for the car side.

But I want to see real customers, not just a reference design and lab numbers. “Modeled configurations” is doing a lot of work in that press release.

Next week’s show is the first test. If a big data center name signs on, this gets real fast.