 The 2011 Volt 's lithium @-@ ion battery ( Li @-@ ion ) battery pack weighs 435 lb ( 197 kg ) and " consists of 288 individual cells arranged into nine modules . Plastic frames hold pairs of lithium @-@ ion cells that sandwich an aluminum cooling fin . The design and construction of that aluminum plate was critical to ensuring an even temperature distribution with no hot or cool spots across the flat , rectangular cell . The battery pack has its own cooling circuit that is similar to , but independent from , the engine cooling system . " 
