Electric Ship Batteries Promise Compact, Cooler Power

Xing Mobility is promoting its Immersio CTP battery for ships, using a cell-to-pack design that removes conventional module boxes and cooling plates while submerging cells in electrically nonconductive coolant. The company says the design can store twice as much energy as conventional marine batteries and prevent a failing cell from setting off neighboring cells. Its lab-tested pack-level energy density is about 200 watt-hours per kilogram, roughly 19 percent above Corvus Energy’s listed system, though Xing’s larger “double” comparison uses lower-density lithium iron phosphate batteries. The pack’s volume advantage may matter more on ships, where battery space displaces cargo or passengers: Xing reports 330-350 watt-hours per liter, versus Corvus’s 212.5.

Immersion can transfer heat more directly than cold plates, and an expert considers Xing’s claim that it could cool a punctured cell from about 1,000 °C to below 100 °C in ten seconds physically plausible. But the evidence remains incomplete: the company has not disclosed detailed test results, only two vessels use its batteries and neither uses this design, and the CTP has not received DNV approval. Its nickel-rich cells can be more prone to thermal runaway than LFP cells, while the cooling oil is flammable, potentially undermining fire containment. Long-term fluid degradation and saltwater contamination also need testing. Early deployment is likely to be on smaller vessels, where real-world operation can test performance amid vibration, salt air, and repeated temperature cycles.