Device for monitoring cell voltage

US8248030B2 · kind B2 · utility

Assignee

• Johnson Controls Technology Company · US

Inventors

• Matthias Doepke · Garbsen, DE
• Henning Eisermann · Edemissen, DE

Key dates

• Filing date: Jul 21, 2008
• Grant date: Aug 21, 2012
• Expiry date: Jul 21, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R19/16542
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for monitoring a rechargeable battery having a number of electrically connected cells includes at least one current interruption switch for interrupting current flowing through at least one associated cell and a plurality of monitoring units for detecting cell voltage. Each monitoring unit is associated with a single cell and includes a reference voltage unit for producing a defined reference threshold voltage and a voltage comparison unit for comparing the reference threshold voltage with a partial cell voltage of the associated cell. The reference voltage unit is electrically supplied from the cell voltage of the associated cell. The voltage comparison unit is coupled to the at least one current interruption switch for interrupting the current of at least the current flowing through the associated cell, with a defined minimum difference between the reference threshold voltage and the partial cell voltage.