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:
Mar. 20, 2007
Filed:
Nov. 19, 2003
Darrell J. King, Belmont, MA (US);
Per Onnerud, Framingham, MA (US);
Jay J. Shi, Acton, MA (US);
Allan Chertok, Bedford, MA (US);
J. Thomas Fowler, Marblehead, MA (US);
Gerald R. Larocque, Bedford, MA (US);
Darrell J. King, Belmont, MA (US);
Per Onnerud, Framingham, MA (US);
Jay J. Shi, Acton, MA (US);
Allan Chertok, Bedford, MA (US);
J. Thomas Fowler, Marblehead, MA (US);
Gerald R. Larocque, Bedford, MA (US);
Tiax LLC, Cambridge, MA (US);
Abstract
A system and method for determining and balancing state of charge among plural series connected electrical energy storage units is provided. State of change of a selected storage unit in a string of storage units is determined by (i) applying a non-dissipative load to the selected storage unit, resulting in an energy transfer between the selected storage unit and the string of electrical energy storage units through the non-dissipative load and (ii) determining the state of charge of the selected unit from voltage and current data of the selected storage unit resulting from the energy transfer. When the state of charge of the selected unit is different than a target state of charge, energy can be transferred between the selected unit and the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge.