Battery swap and sodium‑ion pick up

Arcfox, Nio and CATL each disclosed new battery-related milestones in early May, adding fresh data points to how Chinese electric-vehicle companies are building around refueling speed, battery ownership models and alternative chemistries. Arcfox said its S3 sedan will go on sale on May 22 with a swappable-battery option. Nio said its swap network handled more than 1 million battery swaps during the May Day holiday travel period. CATL, the world’s largest EV battery maker, separately expanded its sodium-ion push with a 60 GWh supply agreement and reports of a 5 billion yuan capacity plan. ### Why does Arcfox’s May 22 launch matter? Arcfox said on May 13 that the S3, a mid-size electric sedan under BAIC, will officially launch on May 22, 2026, with a battery-swapping option alongside conventional charging. The model is in pre-sale in eight variants priced from 64,800 yuan to 125,800 yuan, according to CarNewsChina’s report citing the company’s announcement. (carnewschina.com) An April 24 report on the model’s debut said the S3 would be offered in a 535-km battery-swap version as well as 560-km and 660-km CLTC charging versions. That report also described the S3 as Arcfox’s first mass-produced model to support battery swapping. ### What exactly did Nio say it achieved in one week? Nio said its 3,839 battery swap stations completed 1,031,469 swap services from April 30 to May 6, covering China’s May Day holiday period. (carnewschina.com) CnEVPost, citing company data, said the network also recorded high charging usage and that more than 87% of the electricity delivered by Nio’s charging facilities went to users of other brands. (english.news18a.com) Nio said in February that it had completed its 100 millionth cumulative battery swap at 22:33:18 Beijing time on February 6. The company’s investor-relations site said Nio had delivered 1,110,413 vehicles cumulatively as of April 30, 2026, giving additional scale context for its battery-swap network. ### How large is Nio’s swap network now? (cnevpost.com) Nio’s website describes Nio Power as a system built around battery charging, battery swapping and battery upgrades. The company’s May Day figures were tied to 3,839 swap stations, according to CnEVPost’s report on the holiday period. A Yahoo Finance report, citing recent company disclosures, said Nio plans to add another 1,000 swap stations in 2026 and has a longer-term goal of a 10,000-station network. (nio.com) Nio has separately said it will report first-quarter 2026 financial results on May 21. ### What is CATL doing on sodium-ion batteries? (nio.com) CATL said on May 6 that it signed a three-year strategic cooperation agreement with HyperStrong covering 60 GWh of sodium-ion battery supply for energy storage projects. The company called HyperStrong its first strategic partner for sodium-ion energy storage. CATL said on April 21 that its Naxtra sodium-ion battery had reached GWh-level industrialization. (finance.yahoo.com) On February 5, CATL and Changan said they had unveiled what they described as the world’s first mass-production passenger vehicle equipped with sodium-ion batteries, with a market launch targeted for mid-2026. ### Where does the reported 5 billion yuan investment fit in? (catl.com) CnEVPost reported on May 9, citing an environmental disclosure in Fujian, that CATL plans to invest 5 billion yuan, or about $735 million, to add 40 GWh of sodium-ion battery capacity. Automotive and battery trade reports said the project is tied to CATL’s Fuding Shidai site in Ningde, Fujian. (catl.com) Those reports said the added capacity would support CATL’s broader sodium-ion manufacturing buildout after the HyperStrong agreement. CATL’s own recent statements stop short of announcing the 5 billion yuan project directly, but they do show the company moving sodium-ion batteries from product launch to supply contracts and planned vehicle deployment. (cnevpost.com) ### What are the next dates to watch? May 21 is Nio’s scheduled date for first-quarter 2026 earnings, according to its investor-relations site. May 22 is Arcfox’s planned S3 launch date in China. CATL and Changan have said their sodium-ion passenger vehicle is due to reach the market by mid-2026. (ir.nio.com) (catl.com)