Nature of Business	12 Months Ended
Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Note 1. Nature of Business SES AI Corporation and its consolidated subsidiaries (together the “Company”) consists of SES AI Corporation (“SES”) and its wholly-owned subsidiary SES Holdings Pte. Ltd. (“SES Holdings” or “Old SES”), along with its wholly owned subsidiaries SolidEnergy Systems, LLC (“SES LLC”), SES (Shanghai) Co., Ltd. (“SES Shanghai”), SolidEnergy Systems Securities Corporation (“SES Securities”), Viking Power Systems Pte. Ltd. (“SES Viking”), SES AI Korea Co., Ltd. (“SES Korea”), Molecular Universe Pte. Ltd. (“Molecular Universe Ltd.”), SES Energy Storage (Shanghai) Co., Ltd. (“SES Energy Storage”), and Shenzhen UZ Energy Co., Ltd. (“UZ Energy”). SES Holdings is a Singapore private company limited by shares formed in November 2018. SES LLC is a Delaware limited liability company formed in November 2018 as a result of the conversion from a corporation to a limited liability company by SolidEnergy Systems Corp, a Delaware corporation formed in April 2012. SES Shanghai was registered in Shanghai, China in August 2018. SES Securities was incorporated in December 2017 as a Massachusetts Security Corporation. SES Viking is a Singapore private company limited by shares and was formed in May 2019. SES Korea, formerly known as Massachusetts Solid Energy Co., Ltd., was registered in South Korea in November 2021. Molecular Universe Ltd. is a Singapore private company and was incorporated in September 2022. SES Energy Storage is a China private company and was incorporated in August 2025. UZ Energy is a China private company that was acquired in September 2025. The Company is engaged in the development of AI-enhanced high-performance, Lithium-Metal (“Li-Metal”) and Lithium-ion (“Li-ion) rechargeable battery technologies and battery materials for Energy Storage Systems (“ESS”), Urban Air Mobility (“UAM”), drones, robotics, electric vehicles (“EVs”), and other applications. The Company’s mission is to accelerate the world’s energy transition through AI-enhanced material discovery and battery management. The Company’s differentiated battery technology has been designed to combine the high energy density of Li-Metal with the large-scale manufacturability of conventional Li-ion batteries in order to help promote the transition to new cleaner technologies. The Company is seeking to accelerate the pace of innovation by currently utilizing AI across the spectrum of our business, from engineering and manufacturing to battery health and safety monitoring and AI-accelerated battery materials discovery. The Company’s headquarter is located in Woburn, Massachusetts with research and development facilities located there, in Shanghai, China, and in Chungju, South Korea. Principal operations have commenced, and the Company has derived revenue from its principal business activities starting in October 2024.

Nature of Business

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Note 1. Nature of Business

SES AI Corporation and its consolidated subsidiaries (together the “Company”) consists of SES AI Corporation (“SES”) and its wholly-owned subsidiary SES Holdings Pte. Ltd. (“SES Holdings” or “Old SES”), along with its wholly owned subsidiaries SolidEnergy Systems, LLC (“SES LLC”), SES (Shanghai) Co., Ltd. (“SES Shanghai”), SolidEnergy Systems Securities Corporation (“SES Securities”), Viking Power Systems Pte. Ltd. (“SES Viking”), SES AI Korea Co., Ltd. (“SES Korea”), Molecular Universe Pte. Ltd. (“Molecular Universe Ltd.”), SES Energy Storage (Shanghai) Co., Ltd. (“SES Energy Storage”), and Shenzhen UZ Energy Co., Ltd. (“UZ Energy”).

SES Holdings is a Singapore private company limited by shares formed in November 2018. SES LLC is a Delaware limited liability company formed in November 2018 as a result of the conversion from a corporation to a limited liability company by SolidEnergy Systems Corp, a Delaware corporation formed in April 2012. SES Shanghai was registered in Shanghai, China in August 2018. SES Securities was incorporated in December 2017 as a Massachusetts Security Corporation. SES Viking is a Singapore private company limited by shares and was formed in May 2019. SES Korea, formerly known as Massachusetts Solid Energy Co., Ltd., was registered in South Korea in November 2021. Molecular Universe Ltd. is a Singapore private company and was incorporated in September 2022. SES Energy Storage is a China private company and was incorporated in August 2025. UZ Energy is a China private company that was acquired in September 2025.

The Company is engaged in the development of AI-enhanced high-performance, Lithium-Metal (“Li-Metal”) and Lithium-ion (“Li-ion) rechargeable battery technologies and battery materials for Energy Storage Systems (“ESS”), Urban Air Mobility (“UAM”), drones, robotics, electric vehicles (“EVs”), and other applications. The Company’s mission is to accelerate the world’s energy transition through AI-enhanced material discovery and battery management. The Company’s differentiated battery technology has been designed to combine the high energy density of Li-Metal with the large-scale manufacturability of conventional Li-ion batteries in order to help promote the transition to new cleaner technologies. The Company is seeking to accelerate the pace of innovation by currently utilizing AI across the spectrum of our business, from engineering and manufacturing to battery health and safety monitoring and AI-accelerated battery materials discovery. The Company’s headquarter is located in Woburn, Massachusetts with research and development facilities located there, in Shanghai, China, and in Chungju, South Korea. Principal operations have commenced, and the Company has derived revenue from its principal business activities starting in October 2024.