4680 battery cell

4680 battery cell
Name	4680 battery cell
Type	Cylindrical lithium-ion
Nominal voltage	~3.6–3.7 V
Nominal capacity	~20–30 Ah
Diameter	46 mm
Height	80 mm

4680 battery cell. It is a large-format cylindrical lithium-ion battery defined by its 46-millimeter diameter and 80-millimeter height. First unveiled by Tesla, Inc. at its 2020 Battery Day event, the cell represents a significant shift in electric vehicle battery architecture. Its design aims to increase energy density, reduce manufacturing costs, and improve power output for applications in Model Y, Cybertruck, and other future vehicles.

Overview

The development of the 4680 format is central to Tesla, Inc.'s strategy to scale electric vehicle production and reduce reliance on external suppliers like Panasonic and LG Energy Solution. The initiative is led by Giga Texas and Giga Berlin factories, which integrate cell production with vehicle assembly. This cell type is also a key component of Semi truck and next-generation Roadster programs. The technology builds upon earlier cylindrical formats like the 18650 battery cell and 2170 battery cell used in previous Model S and Model 3 vehicles.

Design and specifications

The physical dimensions of 46 mm by 80 mm provide a larger volume than predecessor cells, enabling a greater active material-to-packaging ratio. A major innovation is the use of a tabless design, sometimes called a "Tesla-Elon dry" electrode, which reduces electrical resistance and thermal load. The cell typically utilizes a NCA or LFP cathode chemistry, with ongoing research into silicon-based anodes to replace traditional graphite. Structural integration, where the cell forms part of the vehicle's chassis, is a key design philosophy, pioneered at Giga Berlin for the Model Y.

Manufacturing process

Production leverages a highly automated process developed by Tesla, Inc. and its equipment partners. A core technology is the dry battery electrode coating method, licensed from Maxwell Technologies, which eliminates toxic solvents and reduces factory footprint. Electrode winding for the tabless design is performed on custom machinery, while laser welding is critical for assembling the cell's casing and current collectors. High-speed assembly lines at Kato Road facility in California serve as a pilot for larger-scale output at Giga Nevada and Giga Shanghai.

Performance and advantages

Key performance claims include a fivefold increase in energy capacity, a sixfold rise in power output, and a 16% range boost for vehicles compared to the 2170 battery cell. The tabless design lowers internal electrical resistance, improving thermal performance and enabling faster DC fast charging rates. The larger format reduces the number of cells needed per pack, simplifying BMS complexity for modules used in Cybertruck. Overall, Tesla, Inc. targets a 54% reduction in cost per kWh at the Gigafactory system level.

Adoption and production

Initial volume production began at Kato Road before ramping at Giga Texas for the Model Y. Panasonic started manufacturing 4680 cells at its Wakayama plant in Japan for supply to Tesla, Inc.. Other key suppliers developing the format include LG Energy Solution in South Korea, CATL in China, and startups like Our Next Energy. The BMW Neue Klasse platform and vehicles from GM and Ford are also expected to adopt similar large cylindrical cells.

Challenges and limitations

Scaling production of new technologies like the dry electrode process has proven difficult, impacting output rates at Giga Texas. Incorporating high-content silicon anodes presents challenges with electrode swelling and durability. The larger cell size can exacerbate thermal propagation risks, requiring advanced pack-level firewall designs. Furthermore, manufacturing yield rates and consistent quality have been hurdles, as reported by Reuters and Bloomberg News, affecting rollout timelines for the Cybertruck and Semi.

Category:Lithium-ion batteries Category:Tesla, Inc. Category:Electric vehicle batteries