Following its mass production milestone last month, Tesla has filed its third patent in four months on dry electrode battery manufacturing, building on its 2019 Maxwell Technologies acquisition. The March 5 filing details machine design for continuous electrode film production to cut costs and boost efficiency. Elon Musk reiterated that Tesla's patents are open source, mainly to deter trolls.
Tesla's dry electrode efforts, rooted in the 2019 Maxwell acquisition, have progressed through years of scaling challenges, including a near-total collapse of a supply contract with LG Energy Solution and industry skepticism toward its 4680 cells—a process Musk called 'incredibly difficult.'
Building on the recent mass production achievement, Tesla has accelerated patent filings: starting with November 2025 binder chemistry to fix cathode degradation (where pure PTFE lost five times more capacity than wet methods); January 29 material recipe limiting binder to under 2% by weight; and the latest March 5 machine design using roller speed differentials to form fragile powder into continuous film.
These yield major gains: three calendering passes vs. ten previously (tripling throughput), 90% lower equipment capex and energy (no solvents/drying), targeting 54% more vehicle range, 56% lower cell costs, and 69% reduced capex per output. Overlapping patents block replication of materials, binders, or machinery.
Competitors lag with wet-slurry methods using toxic NMP solvents and large drying setups. On March 7, 2026, Musk posted: 'Tesla patents are open source. We do patents to block the trolls, not because we need protection from competitors.' This fits Tesla's strategy of advancing and sharing battery innovations.
