The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2013
Filed:
Jan. 19, 2011
Martin Eberhard, Woodside, CA (US);
Steve Diamond, San Mateo, CA (US);
Marc Tarpenning, Woodside, CA (US);
Jessica Riley, Mountain View, CA (US);
Alexander Barke, Ingolstadt, DE;
Manfred Ammler, Ingolstadt, DE;
Reinhard Hofmann, Grösdorf, DE;
Martin Eberhard, Woodside, CA (US);
Steve Diamond, San Mateo, CA (US);
Marc Tarpenning, Woodside, CA (US);
Jessica Riley, Mountain View, CA (US);
Alexander Barke, Ingolstadt, DE;
Manfred Ammler, Ingolstadt, DE;
Reinhard Hofmann, Grösdorf, DE;
Volkswagen AG, Wolfsburg, DE;
Audi AG, Ingolstadt, DE;
Abstract
A method for balancing voltage for a multi-cell battery system, in which the battery system includes at least two parallel groups of cells connected in series and in which the parallel group of cells includes at least one battery cell, includes: charging the battery system by keeping the voltage of all parallel groups of cells less than or equal to a second threshold voltage value, while at least the voltage of one group of parallel cells is less than or equal to a first threshold voltage; and while at least the voltage of one group of parallel cells is less than or equal to a second threshold voltage; and while the charging current is above a predefined minimal current. The method further includes measuring the voltage of each parallel group of cells while electrical loads are shut off and dissipating energy in each of the parallel group of cells of the amount that is represented by the voltage difference between the individual parallel group of cells and the parallel group of cells with the lowest voltage.