100-kWh EV battery packs roll off production line, promises 311 miles of range in 12 mins

Most battery developers view semi-solid technology as a temporary fix on the road to fully solid-state batteries. A major Chinese manufacturer sees it differently.

Svolt Energy announced on Weibo that it has rolled off the assembly line in Changzhou, Jiangsu province, its first mass-produced 100-kWh “Dragon Armor” semi-solid fast-charging battery packs.

The battery maker said semi-solid batteries will remain a core, permanent option for electric cars for years to come. Semi-solid batteries use a blend of liquid and solid electrolytes to move ions, unlike all-solid-state designs that depend entirely on solid materials.

Over 300 miles range in 12 min

The technical specifications reveal ambitious performance targets. Built on a 900-volt architecture, the pack reportedly supports extreme 6C fast charging. Svolt claims it can pump 311 miles ( 500 kilometers ) of range back into a vehicle in just 12 minutes.

This speed usually raises immediate thermal and safety concerns. To tackle heat, Svolt layered liquid cooling across both the top and bottom of the pack. Inside the cells, a proprietary separator transfer-printing technology stabilizes internal ion transfer during rapid power dumps.

Outside, six layers of underbody armor line the base. The company claimed this structural shell delivers three times the impact resistance required by China’s national safety standard.

Longevity is equally central to the pitch. Reportedly, Svolt uses high-speed cell stacking to deliver a cycle life of over 3,000 charges. This roughly translates to a theoretical lifetime driving distance of more than 0.6 million miles (1 million kilometers).

Boosting EV battery market

But healthy skepticism is warranted. Svolt has not disclosed the exact testing conditions behind its range-recovery numbers, nor has it revealed the size of this initial production batch. While executive leadership confirmed that multiple automakers have secured nominations for the pack, specific customer names stay under wraps for now.

Still, Svolt’s timing is calculated. Fully solid-state batteries replace liquid electrolytes with solid materials, but remain difficult and expensive to manufacture at scale. The firm is pushing semi-solid batteries into mass production today to reach price parity with conventional liquid lithium-ion cells almost immediately.

The launch is a step forward from earlier industry timelines that projected a 2027 rollout.

First-generation semi-solid packs deliver 300 Wh/kg, while a second-generation version currently in development targets 360 Wh/kg. Reports suggest these batteries could power next-generation models for major global brands through established manufacturing joint ventures. Although rumors point to a major supply deal between Svolt and BMW, Mini has not yet been officially named as an initial launch customer.

Svolt holds2.6 percent of the global EV battery market, ranking ninth worldwide according to SNE Research. Domestically, it sits fourth in China’s premium ternary battery segment with a 6.31 percent share.

With mass production of all-solid-state technology still far off, the company expects 2026 to mark the start of widespread semi-solid battery adoption.

Competitors like WeLion supply ultra-high-density 150-kWh packs for NIO’s luxury EVs to maximize range, but the high price tags keep them limited to high-end applications. QingTao Energy and SAIC are also partnering on high-performance semi-solid tech.

Source: https://interestingengineering.com/energy/china-mass-production-100kwh-ev-battery