Follow the kilowatt-hours, and a large share of them pass through CATL. On December 31, 2024, CATL was granted US12183938B2, "Battery pack and electric apparatus." The CPC codes — H01M 50/242, 50/204 and 50/244 — are tightly focused on pack mounting and structural casing.Pack structure is where cell-to-pack cost is won or lost. The dominant supplier's structural design — how cells are held, cased and integrated — sets a cost baseline that flows into the pack price every customer automaker pays. A more efficient structure from CATL is leverage across the whole customer base, not just one program.The chemistry is the easy part; the supply chain isn't — and CATL is much of that supply chain. But a packaging patent is an input into cost, not the contracted cost itself. The actual price an automaker pays lives in supply agreements and bills of materials, not the grant.For the ledger reader, this is supporting evidence of where the industry's largest cell supplier is pushing pack cost, kept subordinate to the financials. Any contracted-supply or pricing claim rests on the relevant SEC filing or exhibit on sec.gov, surfaced via EdgarBeast as the evidence index.Read it as a 2024 packaging-cost position from CATL. Whether it lowered pack cost for customers is answered downstream in supply economics — the grant only tells you where the dominant supplier aimed.