Apple Looks to Improve Battery Life With Redesigned 'Jelly Rolls'

Apple is reportedly working to improve battery life in its devices with a concept for a new redesigned battery containing multiple 'jelly rolls' enclosed in a single pouch, reports AppleInsider.

The jelly roll or Swiss roll design is the design used in the majority of cylindrical rechargeable batteries. In this design, an anode material is laid down, a separator is applied, and a cathode material is laid down. This is then rolled up and inserted into a hollow cylinder. [W]

A new Apple patent filing dubbed "Battery with Multiple Jelly Rolls in a Single Pouch," notes that a lithium-polymer battery can achieve a packaging efficiency of between 90 percent and 95 percent if a jelly roll is enclosed in a foil pouch. Apple proposes that an increase in efficiency can be had with a new kind of battery cell that uses a set of jelly rolls found in a foil pouch, rather than just one.


"The use and placement of multiple jelly rolls of different lengths and thicknesses within a pouch may allow the creation of a custom battery cell that maximizes the use of free space within a portable electronic device and provides greater capacity, packing efficiency, and/or voltage than battery cells that contain only one jelly roll per pouch"

"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 (PCBs), memory, storage, etc.) inside the enclosure of a mobile phone," it states.

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