The two companies also signed a joint development agreement to co-develop next-generation prismatic batteries for electric vehicles, drawing on Samsung SDI's high energy density and fast-charging technologies.
The resulting cells are expected to power GM's future EV models.
SynergyCells was established in 2024 in New Carlisle, Indiana, on the back of a combined investment of about $3.5 billion. The plant, still under construction, is designed for an annual capacity of 27 gigawatt-hours. Financial terms of the stake transfer were not disclosed.
Samsung SDI plans to install energy storage system battery lines at the same site, a hedge against sluggish EV demand and a bid to capture the rapidly expanding North American ESS market.
"This decision reflects changes in the market while continuing our strategic partnership with GM," said a Samsung SDI official.
"At this plant we will sustain our joint efforts for the coming EV era, and at the same time respond aggressively to ESS demand in the United States."
The handover extends GM's retreat from battery ventures. The Detroit automaker earlier sold its stake in a Michigan plant to LG Energy Solution, and its Ultium Cells joint venture in Tennessee has shifted toward stationary storage cells, according to Bloomberg, which first reported the Indiana sale.
AJP Takeaways
• Samsung SDI and General Motors signed a joint development agreement the same day to co-develop next-generation prismatic batteries, which are expected to be fitted in General Motors' future electric vehicle models.
• Samsung SDI will add energy storage system battery lines at the Indiana plant, which was launched in 2024 on a combined investment of about $3.5 billion and is designed for an annual capacity of 27 gigawatt-hours.
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