Penetration experiment is conducted on the sodiumion battery developed by Shiji Huana (left) and the battery made from other material (right) in the same environment under the same standards. The sodium-ion battery survives the experiment, while the other battery catches fire and burns. (Screenshot of a video taken in a Shiji Huana laboratory)

Subjected to extreme conditions — 16 hours of freezing at -40°C, 8 hours of baking at 70°C, 8 hours of submersion in a 1-meter-deep freshwater pool, burning until all combustibles are consumed, repeated 1.2-meter drops onto solid ground, and continuous needle penetration — sodium-ion batteries underwent rigorous tests exceeding national standards for electrochemical performance and safety. Despite the "torture," data from discharge cabinet test software and multimeter voltage readings confirmed that these batteries maintained stable electrochemical properties and were reliably safe.

The experiments didn't stop there. "Battery cell cutting tests are almost unheard of in the industry, but we are ready to push the limits further," said Professor Zhou Shi, chief scientist at Fujian Shiji Huana New Energy Technology Group (hereinafter "Shiji Huana"), a company specializing in the research and development (R&D) and production of special power supplies since its inception. After over 40 hours of intensive testing, the sodium-ion battery pack was cut open, and a cell was extracted to continue the "adventure." Fully charged again to increase the challenge, the same battery cell was put through additional extreme tests, including multiple penetrations, cutting and heavy impacts, simulating the severe external forces a sodiumion battery might face in a traffic accident.