Following new energy vehicles (NEVs) and energy storage, a third growth engine for power batteries is emerging on the water: electric ships. At the May 2026 CIBF exhibition, industry giants—including CATL, BYD, CALB, Sunwoda, EVE Energy, and Gotion High-Tech—collectively showcased their marine battery solutions. Market data reveals a steep growth trajectory: China’s electric ship battery shipments, which stood at less than 1 GWh in 2024, surged to 3.6 GWh in 2025—more than tripling in a single year—a growth rate surpassing the initial boom seen in the NEV sector a decade ago. The global electric ship market is projected to grow from $4.8 billion in 2025 to $18.3 billion by 2032; the Chinese market is expected to exceed 36 billion RMB by 2026, with the marine battery segment posting a compound annual growth rate (CAGR) of 131.9% between 2025 and 2029.
The Bottom Line: Electric ships represent the most certain growth engine for batteries after NEVs, yet “ships and cars operate within completely different systems”—characterized by high-humidity, high-salinity environments, 20-to-30-year lifespans, and “one-ship-one-approval” certification processes by classification societies. Success in these deep waters belongs to those who can master differentiated operational design and integrate ship-shore-cloud ecosystems.
I. Giants Stake Their Claim, Each Showing Their Strengths
CATL: Initiated its marine strategy in 2017; by the end of 2025, approximately 900 vessels were equipped with its batteries. In 2025, it launched the world’s first integrated “ship-shore-cloud” zero-carbon shipping solution (featuring megawatt-level charging, minute-level battery swapping, and cloud integration). By 2026, its marine-focused team had expanded to around 500 personnel. In January 2026, it delivered five all-electric cargo ships to Shandong and signed contracts for another 50, forming the first large-scale fleet of its kind on the Beijing-Hangzhou Grand Canal.
BYD: Signed a strategic agreement with Corvus Energy, a Norwegian leader in zero-emission maritime technology, to jointly develop high-rate LFP marine battery systems; leveraging international partner channels and certifications from multiple classification societies to integrate into the global maritime decarbonization supply chain.
CALB: Its “Zhiyuan” series obtained certifications from CCS, DNV, ABS, RINA, and BV; in March 2026, the “Shenren’an 1″—China’s first carbon-fiber, electric-propelled official vessel—was delivered in Shenzhen, advancing the adoption of battery power for both inland waterways and ocean-going vessels.
Sunwoda: Initiated its strategy in 2019 and showcased the “SAIL” solution (featuring 314Ah energy-type and 268Ah power-type cells); it emphasizes differentiated design at the cell level based on specific operating conditions, rather than simply repurposing automotive batteries.
II. Ships vs. Cars: Truly Distinct Systems
Ships have a design lifespan of 20–30 years, far exceeding that of automobiles. They operate in environments characterized by high humidity, high salinity (salt spray), and enclosed compartments; any negligence in thermal management can lead to catastrophic thermal runaway. Furthermore, they must pass rigorous certifications from international classification societies, requiring individual vessel inspections and lifelong accountability. Sunwoda states bluntly: “Battery requirements and regulatory frameworks for ships and cars constitute two almost entirely different systems.” Leading companies compete through differentiation in BMS customization, liquid cooling thermal management, and adaptability to diverse operational scenarios.
Economic viability remains a hurdle: The construction cost of electric ships is approximately 30% higher than that of fuel-powered vessels, and the unit price of marine lithium batteries is roughly double that of automotive batteries. A single all-electric cargo ship may require battery capacity reaching several thousand kilowatt-hours (kWh), with batteries potentially accounting for over one-third of the total construction cost. CATL addresses safety challenges—such as humidity, salt spray, and long-term reliability—through a “dual-circuit containerized power system” (certified by the world’s top five classification societies and featuring redundant design), while lowering the initial barrier for shipowners via a “separation of ship and battery” model combined with a “battery bank” approach.
III. Three Major Challenges and the Path to a Breakthrough
1. Safety and Technical Compatibility: Safe and controllable battery packs (or cabinets) are a prerequisite for large-scale application; existing solutions aim for “100% safety.”
2. Economic Viability and Cost: Cost reduction relies on economies of scale and standardization; currently, the global penetration rate of electric ships remains below 1%.
3. Energy Supply Infrastructure: A waterway energy supply network is being built from scratch; most vessels have a range of 100–200 km, making them suitable for fixed short-haul routes in ports and inland waterways. Experts strongly advocate for “grid-plus-renewables” (wind and solar) battery-swapping stations for inland and coastal waters (with station spacing of approximately 100 km, fully automated battery swapping taking 10–30 minutes, and a green electricity cost of 0.3–0.4 RMB per kWh).
IV. Dual Drivers: Policy and Standards
The IMO mandates a reduction in shipping greenhouse gas emissions of over 20% by 2030 compared to 2008 levels; domestically, the Maritime Safety Administration issued the *Interim Rules on Technology and Inspection of Pure Battery-Powered Ships* in February 2025, and provinces such as Hubei have introduced vessel upgrade schemes. However, a lack of standardization remains a major obstacle—preventing, for instance, a ship from the upper reaches of the Yangtze from traveling to the lower reaches. Unifying standards and battery-swapping models is key to a systemic breakthrough for the industry. Multiple enterprises anticipate that the next 3–5 years will be the critical window for electric vessels to transition from “demonstration projects” to “large-scale adoption.”
In Conclusion: From materials (silicon-carbon, LFP, sodium-ion), structures (CTP/CTC/CTB), and form factors (large cylindrical, solid-state) to systems (ultra-fast charging, energy storage, battery swapping, safety), globalization (overseas expansion, EU, US), resources (minerals, hydrogen energy), manufacturing (AI-driven smart manufacturing), and end-use applications (low-altitude economy, two-wheelers, marine vessels)—the puzzle of the entire battery industry chain is essentially complete.
