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.

Expansion of lithium ion pouch cell batteries.

Without them today s mobile phones mp3 players notebooks and electric vehicles would be unthinkable. But how do they work. When a safety problem occurs the pouch cell will generally be blown apart unlike the steel shell or the aluminum shell. 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.

The pouch cell makes the most efficient use of space and achieves a 90 to 95 percent packaging efficiency the highest among battery packs. In 1995 the pouch cell surprised the battery world with a radical new design. Expansion of lithium ion pouch cell batteries. The pouch cell is packaged in aluminum plastic film.

Ding and david j. Observations from neutron imaging jason b. Request pdf 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.

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. 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. Siegel a z anna g. Eliminating the metal enclosure reduces weight but the cell needs some alternative support in the battery compartment.

Types of battery cells the authour said this the 18650 has a higher energy density than a prismatic pouch li ion cell. Observations from neutron imaging the expansion of battery material during lithium intercalation is a concern for the cycle life and. Observations from neutron imaging author j. 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.

Pouch cell battery packs. Gorsich journal journal of the electrochemical society year. The expansion of battery material during lithium intercalation is a concern for the cycle life and performance of lithium ion batteries. In the article bu 301a.