PULSE BATTERY CHARGER METHODS AND SYSTEMS FOR IMPROVED CHARGING OF LITHIUM ION BATTERIES

摘要

The inventions herein relate to devices and methods to impart charge to lithium ion battery cells. Still further, the present invention incorporates to pulse charging methods and systems related thereto that provide improvements in charging speed, efficiency and additional benefits.

主权项

1. A process for charging a Li-ion battery cell, wherein the process comprises:
a) providing at least one Li-ion battery cell, wherein the battery cell comprises:
i) a series internal resistance (Rs);ii) a maximum acceptable battery terminal voltage (Vmax);iii) a battery terminal voltage (VBatt); andiv) an instantaneous open circuit voltage (OCVinst); b) applying to the battery cell a plurality of charging pulses to provide a desired C rate,
i) wherein each charging pulse, independently, comprises an ON-time and an OFF-time, wherein the ON-time follows the OFF-time,ii) wherein the process during the OFF-time presents to the battery the nature of an open circuit, andiii) wherein the battery terminal voltage, VBatt, during the ON-time portion of each of the plurality of voltage pulses, independently, is determined according to the formula:
VBatt=IBatt×Rs+OCVinst andIBatt=IBattCavg×(pulse period)/(on-time duration);where IBattCavg comprises the C rate applied to the battery.