Solid-state battery developer QuantumScape shared another exciting milestone today: integrating its long-developed “Cobra” solid-state separator manufacturing process into its baseline production. This step technology significantly reduces the overall footprint and production time of QuantumScape’s proprietary solid-state cells, setting the stage for commercialized production.

Much of our QuantumScape updates the past couple of years have pertained to the progress of its QSE-5 solid-state sample cells (because, let’s face it, that’s the most exciting stuff). However, some of QuantumScape’s production techniques are just as innovative as its cell technology.

In many ways, QuantumScape’s cream of its solid-state crop is its assembly lines, especially since arguably the most challenging hurdle for bona fide solid-state battery integration is scaled production at a cost that OEMs will be willing to opt for over lithium cells, which also won’t bankrupt the company.

We’ve known of these plans since 2023, when QuantumScape shared two phases of its assembly line overhaul using a fast separator heat-treatment process – Raptor and Cobra.

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Raptor was completed two years ago and introduced a step-change process, allowing continuous flow heat treatment to process the separator films faster with less total heat energy. The next phase, “Cobra,” was expected to build off Raptor and add even faster processing, particularly in the cell’s ceramics. Per the solid-state battery developer, Cobra is a “potential game changer in scaled cell production.”

By early 2024, QuantumScape was beginning to gear up for high-volume production of its solid-state electrolyte separator using the “Cobra” equipment and process, and by last December, was ready for initial separator processing on the QS-0 assembly line for B-sample cells.

QuantumScape has confirmed that Cobra has been fully integrated into the company’s baseline production processes, achieving a 2025 goal while enabling gigawatt-level solid-state cell production.

QuantumScape’s Cobra separator is production’s secret sauce’

“What’s so special about a solid-state separator process?” Well, a lot actually.

The QuantumScape team will be the first to tell you that its proprietary solid-state separator is the proverbial key that unlocks the startup’s leading and potentially industry-changing performance in energy density, charge times, battery life, safety, and cost.

We all know that solid-state battery technology has the potential to enable a paradigm shift in electric mobility, providing cars, planes, boats, and plenty of other vessels with cells that will enable them to travel farther than ever. This technology has often been deemed a “holy grail” for electric mobility and while some companies, including QuantumScape have developed viable solid-state cells, none have scaled to mass production yet.

As we’ve reported on many times in the past, QuantumScape remains a leader in the space as one of the companies that appears closest to achieving the feat, thanks to its aforementioned Raptor and now Cobra manufacturing processes.

Hence why today’s news is a big deal.

In addition to unlocking the potential for solid-state cell production itself, QuantumScape says Cobra is the core innovation that will allow the technology to be manufactured at a gigawatt-hour scale. This breakthrough is expected to lay the groundwork for higher-volume B1 sample production and the startup’s path to market.

Furthermore, the technology supports QuantumScape’s licensing model with Volkswagen Group, which was announced a year ago. In this model, contract manufacturing can potentially help avoid tariffs by transferring IP instead of physical goods, especially as battery demand continues to grow steadily despite geopolitical tensions.

Looking ahead, we will see how Cobra contributes to QuantumScape’s production progress in 2025, hoping to get a more concrete timeline on when its solid-state batteries could hit the EV market.