The world's largest battery maker CATL was the first to use humanoid robots to assemble batteries
| Customers: Contemporary Amperex Technology Ltd (CATL) Electrical and Microelectronics Contractors: Spirit AI Project date: 2025/12
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December 17, 2025 Chinese company Contemporary Amperex Technology Co. Limited (CATL) announced the introduction of humanoid robots into commercial operation at its Zhengzhou plant. This is the world's first large-scale use of such robots in the production of batteries for electric vehicles.
In an official release, CATL introduced a robot named "Moz" ("Moz") developed by subsidiary Spirit AI. Moz performs End of Line (EOL) and Direct Current Resistance (DCR) final control tasks.
These processes are final checks of battery pack functionality before being sent to the customer. Previously, accurate connection of test plugs under voltage of hundreds of volts required human labor, which created the risk of electric shock and led to fluctuations in speed and quality of work.
Equipped with a comprehensive vision-language-action (VLA) system, the Moz robot is able to perceive the situation and flexibly adapt its actions to changing conditions. According to CATL, it performs well in three areas: accurate adaptation to part displacements, careful handling of flexible components and connection reliability exceeding 99%. The operational efficiency of the robot corresponds to the performance of a qualified person.
 | Moz has become an indispensable member of our production line, CATL said. In addition to basic duties, the robot independently monitors the quality of connections, instantly signals malfunctions and conducts additional checks. With the serial production of various battery models, it increased the daily production rate by three times, ensuring stability and uniformity of operations. |  |
The project was implemented within the framework of internal cooperation: the robot runs on batteries of CATL's own production, and its implementation was preceded by the joint work of the company's engineering and production divisions to analyze technological processes and form a technical assignment.[1]
Notes
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