Expansion Of Lithium Ion Pouch Cell Batteries

Pouch cell weight is 40 lighter than steel shell lithium battery of the same capacity 20 lighter than aluminum shell lithium battery.

Expansion of lithium ion pouch cell batteries.

Pouch cell battery packs. Observations from neutron imaging jason b. In this paper the electrode expansion is quantified from in situ neutron images taken during cycling of pouch cells with lithium iron phosphate positive and graphite negative electrodes. Expansion of lithium ion pouch cell batteries.

Stefanopoulou a patrick hagans b yi ding c and david gorsichc adepartment of mechanical engineering university of michigan ann arbor michigan 48109 usa bnavitas systems asg ann arbor michigan 48108 usa. The pouch cell is packaged in aluminum plastic film. Observations from neutron imaging author j. When a safety problem occurs the pouch cell will generally be blown apart unlike the steel shell or the aluminum shell.

The pouch cell makes the most efficient use of space and achieves a 90 to 95 percent packaging efficiency the highest among battery packs. Eliminating the metal enclosure reduces weight but the cell needs some alternative support in the battery compartment. Jeff dahn one of the leading battery researchers in the world says he and his team have devised new lithium ion pouch cells that outperform solid state batteries. Types of battery cells the authour said this the 18650 has a higher energy density than a prismatic pouch li ion cell.

Without them today s mobile phones mp3 players notebooks and electric vehicles would be unthinkable. The 3ah 18650 delivers 248wh kg whereas a modern pouch cell has about 140ah kg this might be a typo as the energy density is measured in 2 units in the quote wh kg and ah kg. Rather than using a metallic cylinder and glass to metal electrical feed through for insulation conductive foil tabs welded to the electrode and sealed to the pouch carry the positive and negative terminals to the outside. Expansion of lithium ion pouch cell batteries.

But how do they work. In 1995 the pouch cell surprised the battery world with a radical new design. The expansion of battery material during lithium intercalation is a concern for the cycle life and performance of lithium ion batteries. Ding and david j.

Gorsich journal journal of the electrochemical society year. Observations from neutron imaging the expansion of battery material during lithium intercalation is a concern for the cycle life and. Observations from neutron imaging article siegel2013expansionol title expansion of lithium ion pouch cell batteries. Siegel a z anna g.