HEATER135_160_ISO_PLATE

Additional insulation for the heating. It is required at the beginning and end of the battery stack (the arrangement can be seen in the second image, left and right).

The circuit board is made of FR4 material.

FR-4, or simply FR4, refers to a class of flame-resistant and flame-retardant composite materials, consisting of epoxy resin and fiberglass fabric. The abbreviation FR stands for flame retardant and meets the requirements of UL94V-0.