What is the black pad/foil behind battery?

Question

Google Pixel XL

The first Android smartphone from Google, the Pixel XL (Model Number: G-2PW2100) was launched October 20, 2016. It has a 5.5-inch AMOLED display, 3450 mAh battery, and 32 or 128 GB storage options.

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Dberk @fbeozpo

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Postado: 12 de jun de 2021

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What is the black pad/foil behind battery?

As shown in the Google Pixel XL Battery replacement guide, there is a black pad/foil between the battery and the body of the phone. It can be seen in the attached image.