Why is the Xiaomi Smart Band 10 shut down in high-temperature environments?

The Xiaomi Smart Band 10 features an automatic shutdown mechanism for high-temperature protection. A warning will be displayed before shutdown occurs. After thermal protection is triggered, the band can be restarted by connecting it to a charger.
For your reference, here are the shutdown rules of the band in high-temperature environments:
Wearing StatusTemperature RangeShutdown Time
Worn for over 3 minutes41°CShutdown after 10 minutes
Worn for over 3 minutes43°CShutdown after 1 minute
Worn for over 3 minutes45°CShutdown after 1 minute
Worn for over 3 minutes48°CShutdown after 1 minute
Not worn45°CShutdown after 10 minutes
Not worn48°CShutdown after 1 minute
/58°CImmediate shutdown
/-18°CImmediate shutdown