Apple patent looks to extend battery life on future iPhone models using 'Jelly Rolls'
made more efficient as well as smaller and increase the amount of free space in a portable device like the Apple iPhone. Putting more than a single 'Jelly Roll' into a single foil pouch would increase the voltage, packing efficiency and capacity of a cell. The application says that "Along the same lines, jelly rolls of various thicknesses and lengths may be sealed in a pouch to create an asymmetric battery cell that fits around other components (e.g., processors, printed circuit boards, memory, storage, etc.) inside the enclosure of a mobile phone."
Apple has been toying with other ideas aimed at improving the battery life of the iPhone including using dense lithium cells that could increase the power of the cells without an accompanying increase in size. Another idea has been to develop a battery pack that could be used when outlets are not available.
source: USPTO via AppleInsider