Multifoil insulation

In order to control the three factors determining heat transfer, much effort has been spent on developing vacuum insulation for high—temperature batteries involving the use of microporous powders pressed to boards, glass fiber boards, or multifoil insulation. 

The disadvantages of multifoil insulation jackets are the high compresibility (about 20 percent under atmospheric pressure), the low residual gas pressure necessary after evacuation (less than 103 mbar), and the high cost. 

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FIGURE 41.16 Artist s concept of full-scale Li-Al /FeS electric van battery with cutaway showing prismatic cells, heat exchanger, and compressed multifoil insulation, (from Chilenskas et al. Courtesy cf Argorme... 

FIGURE 41.17 Artist s concept of thermally insulated electric-vehicle battery module with cutaway showing biploar Li-Al/FeS stack, lightweight loosely wrapped multifoil insulation, and thermally activated getter system for controlling heat transfer from module. (Courtesy of Argonne National Laboratory.)... 

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