# Samsung SDI partners with Hyundai on nine solid-state EV patents *The joint production tooling supports an initial 1 GWh commercial line for electric vehicles before targeting more than 10 GWh by 2030.* **Published:** November 11, 2026 **By:** Seung-min Park **Section:** Batteries & Electric Vehicles — South Korea **Format:** Company Watch **Confidence:** high **Source:** https://eastasiabrief.com/batteries-ev/samsung-sdi-partners-hyundai-nine-solid-state-ev-patents-1328 **Publisher:** East Asia Brief (https://eastasiabrief.com/) --- ## What to know - Samsung SDI and Hyundai align nine joint patents covering solid-state tooling - Supply deal commits prismatic cell deliveries over seven years through 2032 - Commercial mass production targeted for 2027 at Cheongju plant ![Workers in protective cleanroom suits assemble battery components alongside robotic arms on an automated manufacturing line. (AI-generated image)](https://eastasiabrief.com/media/2026-11-11-ef1785f45190.webp) *Workers in protective cleanroom suits assemble battery components alongside robotic arms on an automated manufacturing line. (AI-generated image)* Hyundai Motor Company and Samsung SDI formalized joint production tooling on Nov. 10, 2026, aligning nine shared patents to establish high-volume manufacturing lines for solid-state electric vehicle batteries. The tooling supports Samsung SDI’s planned commercial line, which targets an initial annual capacity of 1 gigawatt-hour (GWh) — enough for roughly 10,000 electric vehicles — before expanding past 10 GWh by 2030. The joint patents anchor a supply relationship established in October 2023, committing Samsung SDI to supply prismatic cells over seven years through 2032 from its factory in Göd, Hungary. The technical alignment follows an executive meeting held Nov. 9 in Yongin, South Korea, where 177 corporate officers and researchers from both industrial groups met to synchronize development across battery hardware and vehicle software. Samsung Electronics Vice Chairman Jun Young-hyun and Hyundai Motor Group Vice Chairman Chang Jae-hoon led the summit, signaling closer supply chain integration across traction batteries, automotive chips and robotics. Both companies are moving beyond standard cell procurement contracts into co-engineered manufacturing processes, according to technical records released by the Korean Intellectual Property Office. The intellectual property records show the companies submitted nine joint solid-state battery patents between 2022 and 2025. Samsung SDI filed as lead applicant on seven patents, while Hyundai Motor led two. South Korean patent examiners approved two of the nine joint applications for full registration in 2025. The remaining seven patent applications remain under standard statutory review. The patent portfolio reflects an operational shift from laboratory chemical formulation to factory equipment design. Initial filings submitted in 2022 focused on protective coatings for moisture-sensitive sulfide electrolytes. Sulfide electrolytes offer high ionic conductivity but generate toxic hydrogen sulfide gas when exposed to ambient moisture. The 2022 filings introduced oxide, phosphate and alkoxide coatings to passivate vulnerable particulate surfaces. Subsequent joint patents filed after 2023 shifted toward mass-production machinery, focusing on warm isostatic pressing — a manufacturing process that uses heated, pressurized fluid to compress battery layers without liquid solvents. Solid-state cells require immense mechanical pressure to eliminate microscopic voids between solid electrolytes and electrodes. The joint filings specify automated temperature monitoring instruments designed for pressurized vessel chambers. The companies also patented specialized cell preheating units and robotic transfer mechanisms. These systems preserve precise thermal uniformity before cells enter high-pressure pressing stages, preventing structural warping during high-speed runs. Co-engineering extends downstream to electric vehicle integration, according to a separate joint battery patent published by the Korean Intellectual Property Office on Oct. 22, 2026. The October patent details a battery pack engineered around Samsung SDI’s prismatic cell cans. The structure positions thermal exhaust vents on the bottom surface of each individual cell. The pack enclosure integrates exhaust channels within its lower protective tray. This geometry directs hot gases downward during thermal runaway, preventing heat transfer between adjacent modules while protecting passenger compartments. By consolidating the gas-venting passage with the chassis impact-absorption structure, the design eliminates redundant hardware. The integrated floor tray raises volumetric energy density across the complete battery pack. Five automotive engineers from Hyundai Motor and Kia designed the pack layout alongside two electrochemical specialists from Samsung SDI, according to the published patent document. Hyundai Motor Group currently installs Samsung SDI prismatic cells in three commercial vehicles: Kia’s EV2 compact crossover, Hyundai’s Ioniq 3 and Genesis’s flagship GV90 luxury electric sport utility vehicle. The joint tooling initiative seeks to offset Chinese dominance in conventional lithium iron phosphate chemistry. South Korean manufacturers are standardizing solid-state assembly lines to establish technical leadership in premium vehicle segments. Samsung SDI holds approximately 1,200 solid-state patents globally, ranking second in total filings behind Japan’s Toyota Motor. The supplier operates a dedicated pilot line, dubbed the S-Line, in Suwon, South Korea. Hyundai Motor operates an internal battery development center in Uiwang, South Korea, where corporate researchers formulate cell architectures and test assembly methods before deploying designs to commercial supplier factories. Samsung SDI plans to begin commercial mass production of solid-state battery cells at its Cheongju plant in 2027, according to corporate engineering timelines and factory roadmaps. Hyundai Motor Group plans to deploy solid-state battery packs in production electric passenger vehicles between 2027 and 2030, beginning with its Genesis luxury vehicle lineup. The patent office registry does not show a single batch filing of nine patents on Nov. 10, 2026, as the portfolio represents cumulative filings submitted between 2022 and 2025. Neither company has disclosed the specific capital expenditure budget allocated for commercializing the joint tooling, leaving equipment procurement schedules and commercial revenue-sharing terms undisclosed. ## Impact map | Event | Korea | China | Japan | Global impact | | --- | --- | --- | --- | --- | | Solid-state battery tooling standardization | Samsung SDI and Hyundai Motor co-develop 9 manufacturing patents for 2027 Cheongju line | CATL and BYD face Korean standardization in premium sulfide solid-state cells | Toyota Motor retains patent lead with ~1,300 filings as Korean alliance closes gap | Premium EV pack density rises toward 400 Wh/kg with automated WIP assembly | ## In this story - **Companies:** Samsung SDI, Hyundai Motor - **Tickers:** 006400.KS, 005380.KS - **Exposed:** Kia, Samsung Electronics - **Impact:** Supply Chain, Capex, Order Book ## Primary sources 1. kipo.go.kr 2. nongaek.com 3. yna.co.kr 4. asiatoday.co.kr 5. mk.co.kr --- Cite as: East Asia Brief, "Samsung SDI partners with Hyundai on nine solid-state EV patents," November 11, 2026. https://eastasiabrief.com/batteries-ev/samsung-sdi-partners-hyundai-nine-solid-state-ev-patents-1328