Patent ID: 6034506
Filing Date: 2000-03-07
Classification: H02J

Abstract:
Lithium ion battery charging apparatus comprising:a lithium ion battery comprising a plurality of sub-modules each containing a plurality of battery cells; anda charge control circuit that comprises:a plurality of first switches for connecting the battery cells of the plurality of sub-modules in parallel;a plurality of second switches for connecting the respective battery cells of each of the plurality of sub-modules in series;a DC to DC power supply having first and second terminals coupled to the battery cells of each of the sub-modules;a plurality of third switches respectively coupled between the plurality of battery cells of each sub-module and the first terminal the respective DC to DC power supply;a fourth switch coupled between the respective sub-modules;a fifth switch respectively coupled between the second terminal of each respective DC to DC power supply and the respective sub-module; anda sixth switch serially coupled between the charge control circuit and a load.