*This content was translated by AI.
As a demonstration of BYD's newly unveiled "megawatt-level flash charging" technology sparked a major controversy over battery overheating on Chinese social media, Sun Huajun, BYD's battery CEO, personally stepped forward to refute the claims.
The issue began when a live streaming test captured the battery temperature exceeding 76°C. As charging progressed during the test, the battery surface temperature displayed on the screen soared to a high of 76.42°C. Data from the vehicle's internal diagnostic system (OBD) also showed the cell pole temperature approaching 71°C.
The problem lies in the fact that the optimal operating temperature for lithium-ion batteries is between 15°C and 35°C, and maintaining temperatures below 60°C is recommended even during fast charging, making these figures highly unusual. The controversy grew further as the readings significantly exceeded the 65th°C threshold suggested in China's LFP (lithium iron phosphate) battery standard recommendation (GB/T 44500-2024).
Battery experts have also warned of the "battery aging" issues that high-temperature charging could bring. Analysis suggests that if batteries are repeatedly exposed to high-temperature environments above 70°C, the solid electrolyte interphase (SEI) layer inside can be damaged, accelerating capacity loss and performance degradation.
In response, BYD stated that the phenomenon is a temporary physical occurrence resulting from injecting megawatt-level high-power energy in a short time, and that its "Blade Battery" is specially designed to withstand such extreme thermal loads. However, Sun Huajun, BYD's battery CEO, who was not satisfied with this explanation, personally stepped forward to refute the claims.
He dismissed the public concern that batteries would be damaged by such heat as being based on outdated experience, stating, "The public concern that batteries would be damaged by such heat is based on outdated experience." The BYD battery CEO said, "It is merely a limitation of past perceptions," and added, "The symmetrical structure and dual-sided cooling method of the Blade Battery provide natural advantages in terms of thermal management. The battery size was optimized to reduce internal resistance and ensure uniform temperature distribution." He further emphasized, "BYD conducted long-distance driving tests as well as simulations of extreme conditions to verify reliability at the Yangsan plant. If a battery supplier defines 'premium,' then the engineering of an automobile manufacturer and the judgment of users should not be disregarded."
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*This content was translated by AI.
