Patent ID: 8310208
Filing Date: 2012-11-13
Classification: H02J,Y02B,Y02E

Abstract:
1. An improved method of deriving a lithium battery charging algorithm comprising the steps of: a. providing a salt LiPF6 dissolved in EC/DMC solvent to allow lithium ions to leave the structure of a cathode material in large format prismatic cells with a capacity of 100 Ah; b. measuring charge and discharge rates under different C-rate conditions; c. using cathode material phase transformations to ascertain a differential curve; d. observing peaks in the differential curve with all data plotted against dV/dt and V, where V represents voltage and t represents time; e. observing areas in a voltage range where the rate of increase is higher than in other areas; and f. varying the charging current according to cell voltage within the range of 3 to 4.2V.