Monday, July 1, 2024

Stainless Steel Battery Case in iPhone 16

Ming-Chi Kuo (tweet, via Hacker News):

Increasing the energy density of the battery cells will increase the battery temperature when running. To avoid overheating the battery, Apple uses the stainless steel battery case for the first time as a thermal solution.

Stainless steel is not as effective as aluminum in dissipating heat, but it is more robust and less susceptible to corrosion, so in addition to dissipating heat, the stainless steel battery case provides better protection for the battery and the iPhone system.

The use of a stainless steel battery case also reduces the difficulty of removing the battery, which will help Apple comply with the European Union’s requirements for mobile phone batteries’ replaceability in the future.


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