"This tests the ability of researchers to slim down the battery pack." Wu Kai said that CATL applied aviation-grade "7-series aluminum" to the lower box of the battery pack for the first time. "7-series aluminum", the "combat aluminum" in aluminum, is often used in the manufacture of aircraft landing gear, with the characteristics of lightness, sturdiness, and safety.

Wu Kai told reporters that the application of "7-series aluminum" also has many risks, especially the phenomenon of stress corrosion (metal materials break due to the combined action of corrosive medium and stress in some specific media).

"The industry generally believes that this is a technical difficulty of '7-series aluminum', or even a technical forbidden area." Wu Kai said, for this reason, they have controlled the stress corrosion index at the highest level in the industry through hundreds of experiments and related process improvements. . At present, CATL has successfully developed the "7-series aluminum" lower box and mass-produced it.

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