BYD, Battery Reaches '76°C' During Super-Fast Charging… Thermal Management Issues Surge in Charging Speed Race

*This content was translated by AI.

China's largest electric vehicle (EV) maker BYD has come under unexpected heat-related controversy over its ambitious "megawatt-level flash charging" technology. During a charging test conducted via real-time live streaming, footage captured the battery temperature exceeding 76°C, sparking intense debate among the EV industry and consumers regarding battery lifespan and safety.

Temperatures Surpass 'Devil's 70°C'… Online Communities Stir

The test, conducted in early May, was designed to showcase BYD's latest super-fast charging infrastructure and battery durability. However, as charging progressed, the battery surface temperature displayed on the screen soared to a peak of 76.42°C. Data from the vehicle's onboard diagnostic system (OBD) also showed cell pole temperatures nearing 71°C, broadcast in full.

Considering that the optimal operating temperature for lithium-ion batteries typically ranges between 15°C and 35°C, and that temperatures below 60°C are recommended even during fast charging, this figure is highly unusual. Moreover, it significantly exceeds the 65th°C threshold specified in China's LFP (lithium iron phosphate) battery standard recommendation (GB/T 44500-2024), amplifying the impact.

Experts Warn: "May Gain Charging Speed but Lose Battery Lifespan"

EV battery experts have begun warning about the "battery aging" issues caused by high-temperature charging. Analysis suggests that if batteries are repeatedly exposed to high-temperature environments above 70°C, the solid electrolyte interphase (SEI) layer inside may be damaged, accelerating capacity loss and performance degradation.

An industry insider, who requested anonymity, stated, "There is no doubt that we are sacrificing the battery's physical lifespan for the convenience of five-minute charging," and added, "The race for speed has reached a level that threatens the safety margin of batteries."

BYD Responds: "Testing Technical Limits of Blade Battery"

In contrast, BYD and some supporters argue that these results actually demonstrate technical confidence. They contend that the observed phenomenon is a temporary physical occurrence resulting from injecting high-power megawatt-level energy in a short time, and that their "Blade Battery" is specially designed to withstand such extreme thermal loads. They also emphasized that the measured temperature refers only to the external surface temperature, while the battery pack's active cooling system manages overall safety internally.

Battery Thermal Management Issues Resurface

The battery thermal management issue triggered in China has served as a wake-up call for the EV industry, which had previously focused solely on charging speed competition, revealing how significant consumer concern over thermal management has become. Despite this controversy, BYD continues to aggressively expand its super-fast charging network and even expresses confidence in thermal management, creating a contradictory image. A battery surface temperature of 76°C exceeds the threshold that consumers can accept, even if BYD claims it is safe. Otherwise, this thermal management issue would not have become a subject of controversy. Attention now turns to how this may affect consumer purchasing psychology.

<© STARNEWS. All rights reserved. No reproduction or redistribution allowed.>

*This content was translated by AI.