Hyundai files patent for pressurized solid-state battery

In the US, Hyundai has secured a patent for an all-solid-state EV battery system equipped with a ‘pressurizing device’ and significantly improved operating temperatures. The automaker describes the technology as enhancing stability and energy density while reducing production costs.

Like most automakers, Hyundai considers solid-state packs as the next-generation battery technology. In October last year, Sung Nak-shop, head of Hyundai Motor Group’s R&D Planning, said that the group’s vision was 2030 for implementation in its range of electric cars.

Solid-state batteries replace the liquid electrolyte with a solid one, successfully mitigating the risk of thermal runaway fires while increasing range and charging speed. Now, the automaker has filed a patent in the US, titled “All-Solid-State Battery System Provided with Pressurizing Device,” granted on December 28, 2023. It unveils some more details on Hyundai’s strides in this field.

Different approach

Departing from conventional lithium-ion batteries, Hyundai envisions a future with pressurized all-solid-state batteries that are also foldable, ensuring constant pressure in each cell regardless of charging or discharging rates. This approach differs somewhat from other brands like Toyota, BMW, or Volkswagen.

The pressure device should also limit battery damage, a significant consideration in EV technology. The patent states that the cells are arranged in a concealed pressurized package with sensors monitoring temperature and pressure to keep them within safety margins. This setup ensures further enhanced stability of the pack.

At room temperature

The foldable design of the battery pack follows a zigzag pattern, increasing the efficiency per unit area. Traditionally, these packs are stacked like conventional batteries, but this new approach has been developed to improve the assembly process. Scaling up the production is another worry of solid-state packs, and Hyundai seems to have its propriety solution in place.

Lastly, Hyundai’s take on the technology shows one more significant improvement. Whereas solid-state batteries need high temperatures to operate to their full potential (60 degrees), the patent stipulates that they can function at a room temperature of 25 degrees. With these breakthroughs, it is clear that Hyundai, committed to becoming a top-tier EV producer by 2030, wants to rank among the pioneers in the field of battery technology.


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