초록 ▼

A battery heating system for the batteries of an electrical vehicle includes a plurality of electrical heaters. The electrical heaters are apportioned into a plurality of groups, the groups coupled to independently-switchable voltage sources. One or more of the electrical heaters may have a parallel

A battery heating system for the batteries of an electrical vehicle includes a plurality of electrical heaters. The electrical heaters are apportioned into a plurality of groups, the groups coupled to independently-switchable voltage sources. One or more of the electrical heaters may have a parallel/series design for their resistive heater elements, to improve the reliability of those heaters.

대표청구항 ▼

[ What is claimed is:] [1.] A heating system for a plurality of vehicle batteries, said system comprising:a series-connected plurality of vehicle batteries;a plurality of electric heaters apportioned into at least a first group containing at least one electric heater and a second group containing at

[ What is claimed is:] [1.] A heating system for a plurality of vehicle batteries, said system comprising:a series-connected plurality of vehicle batteries;a plurality of electric heaters apportioned into at least a first group containing at least one electric heater and a second group containing at least one electric heater, each electric heater of said plurality of electric heaters in thermal communication with at least one of said vehicle batteries;a voltage downconverter having an input coupled across series-connected plurality of vehicle batteries and having an output;the first group of electric heaters coupled to receive electric power at the series voltage of said series-connected plurality of vehicle batteries;the second group of electric heaters coupled to receive electric power from said output of said voltage downconverter.