Sungrow's growing dependence on externally sourced battery cells is drawing attention to the potential supply-chain risks created by patent disputes involving some of its key suppliers, particularly as energy storage becomes an increasingly important part of the company's business.

Energy storage systems accounted for approximately 41.9% of Sungrow's total revenue in 2025, while purchases from its five largest suppliers represented 25.1% of total procurement, up from 16.8% in 2023. The combination of supplier concentration and reliance on specialized battery cells could leave the company exposed if a major supplier faces restrictions that affect its ability to manufacture or sell relevant products.

Several suppliers linked to Sungrow have been involved in significant intellectual property disputes across major markets. Sunwoda, which partnered with Sungrow on the development of a 684 Ah battery cell used in the PowerTitan 3.0 platform, faced patent enforcement actions in Germany, China and South Korea before reaching a licensing agreement in June 2026.

EVE Energy, another supplier connected to Sungrow's energy storage business, is currently facing proceedings before the U.S. International Trade Commission after LG Energy Solution filed a complaint in July alleging infringement of five U.S. patents. The investigation is proceeding under Section 337 of the Tariff Act, which can result in exclusion orders preventing infringing products from entering the United States. No infringement determination has been made.

The case has attracted particular attention because Section 337 investigations can potentially extend beyond individual components to products incorporating them. There is currently no public evidence establishing that the EVE cells involved in the proceedings are the same cells supplied to Sungrow. However, any restriction affecting relevant battery products could raise questions about downstream exposure for customers relying on those cells.

CALB, Sungrow's second-largest supplier in 2024, has also been involved in multiple patent disputes with CATL in China. A first-instance judgment in 2024 ordered CALB and a related entity to pay approximately RMB58.05 million in economic losses and RMB0.5 million in enforcement costs in one case, while further claims involving battery technologies have also been disclosed. CALB has disputed infringement and challenged aspects of the litigation.

For Sungrow, the central issue may not simply be whether alternative battery suppliers exist. Replacing cells in an energy storage platform can require engineering validation, system integration, safety testing, certification and customer qualification. The company has itself acknowledged that identifying an alternative qualified supplier may not always be possible quickly or on commercially viable terms.

The risk is particularly relevant given Sungrow's international exposure, with approximately 60.7% of its 2025 revenue generated from overseas markets. A supply disruption, injunction or exclusion order affecting a key battery supplier could potentially lead to procurement challenges, product requalification requirements, project delays and additional costs in important export markets.

As competition in the global energy storage sector intensifies, supplier intellectual property risk is becoming an increasingly important consideration for downstream system integrators. For Sungrow, the resilience of its battery supply chain may depend not only on maintaining relationships with multiple suppliers, but also on ensuring that qualified replacement capacity can be secured quickly enough to meet existing project commitments.

Intelligence Takeaway

The signal is less about a single headline and more about how decision-makers should read the operating environment: commercial claims, policy exposure, and execution evidence now need to be evaluated together.