A livestream test of BYD’s second-generation Blade Battery recorded a difference between localised temperature measurements and battery management system (BMS) readings during megawatt flash charging, alongside separate technical comments from BYD’s battery CTO regarding thermal design limits in high-temperature operation.
The test, conducted under ambient conditions of approximately 25°C, recorded a peak localised external sensor temperature of 76.42°C at the centre-bottom area of the battery cell surface. During the same charging session, vehicle BMS data accessed via OBD reported a maximum pole temperature of 71°C.
The difference between the two values reflects variation between localised measurement points and system-level temperature reporting within the battery management architecture.
Livestream measurement structure
According to the test data, multiple internal sensors within the pack recorded a maximum temperature spread of 6.5°C, ranging from 69.89°C to 76.42°C depending on sensor position.
The readings indicate that the temperature distribution within the battery pack was nonuniform during sustained high-power charging. Different sensor locations captured varying thermal states across the cell structure during the same charging cycle.
In lithium iron phosphate (LFP) battery systems, such as BYD’s Blade Battery architecture, heat generation during fast charging is typically concentrated near electrode interfaces and current-collection paths, while dissipation depends on the structural layout and cooling channel efficiency.
Difference between BMS and localised measurement points
The battery management system monitors pack conditions using distributed sensors placed at selected points within the battery pack. These readings are used for thermal control, safety management, and charging regulation.
Localised external sensors or experimental measurement setups may capture temperature values at specific cell surface locations, which can reflect transient or peak thermal conditions not directly represented in system-level outputs.
Differences can appear between peak localised readings and BMS-reported values depending on sensor placement and sampling methodology.
Battery thermal management systems are typically developed using internal modelling, validation testing, and calibrated operating margins, meaning localised temperature variation may already be accounted for within system-level control strategies even when individual hotspot measurements differ from BMS-reported values.
CTO technical comments on thermal limits
In separate remarks during a media interview, BYD battery CTO Sun Huajun addressed industry discussions on flash charging and thermal thresholds in next-generation battery systems.
He stated that the commonly referenced 70°C level should not be treated as a fixed barrier in modern battery design, noting that thermal management capability has evolved alongside cell structure and electrochemical improvements.
Sun also referenced BYD’s Blade Battery architecture, highlighting its structural layout and cooling design as key elements that support high-power charging. He further discussed the company’s development approach, combining production validation and long-cycle testing before commercialisation.
The CTO’s comments did not reference specific livestream measurements or sensor readings; instead, they focused on system-level design principles and charging performance boundaries.
Thermal behaviour under megawatt charging conditions
The recorded temperature range occurred during sustained high-power charging, during which heat generation increases with current density at the electrode interfaces.
Under such conditions, transient temperature differences can form across different regions of the battery pack, depending on the distribution of internal resistance, heat-conduction pathways, and the cooling system’s response speed.
Even when system-level temperatures remain within operational control limits, localised variations can still occur across different measurement points within the pack.
Measurement context and system-level interpretation
Battery evaluation under fast-charging conditions typically combines embedded sensor data, thermal modelling, and post-test analysis to assess internal temperature distribution and control response.
BMS readings represent system-level monitoring inputs rather than full spatial thermal mapping of all cell regions, which is typically reconstructed through modelling or additional instrumentation in testing environments.
Industry context
BYD’s lithium iron phosphate battery installations reached 10.49 GWh in April 2026, reflecting a 26% year-on-year decline, as the market continues to transition toward higher charging power and energy density requirements, according to China EV DataTracker.
Updated: 21/05/2026 17:40 China time
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