Cell balancing module and method in voltage balancing device for a stack of batteries which compares the cell voltages to a coded reference voltage derived from at least two reference voltages

US9647463B2 · kind B2 · utility

Assignee

• AMS AG · AT

Inventors

• Manfred Brandl · Altenkirchen, DE
• Sandeep Vernekar · Karwar, IN
• Vijay Ele · Hyderabad, IN
• Sudhakar Singamala · Hyderabad, IN
• V. Veeresh Babu · Hyderabad, IN

Key dates

• Filing date: Feb 14, 2012
• Grant date: May 9, 2017
• Expiry date: Dec 27, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/70
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

The invention relates to a cell balancing module, particularly for voltage balancing of a stack of batteries. The cell balancing module comprises an interface (SPI, VrefH, VrefL) to input a coded reference voltage (Vref) and input nodes (In1, . . . , InN) for connecting a stack of energy storage cells (BAT1, . . . , BATn). A switching unit (SW) is connected to each of the input nodes (In1, . . . , InN) and a local balancing unit (loc) coupled to the switching unit (SW) and the interface (SPI, VrefH, VrefL). The local balancing unit (loc) is designed to compare the coded reference voltage (Vref) with cell voltages (VBAT1, . . . , VBATn) of the stack of energy storage cells (BAT1, . . . , BATn) to be connected and to charge balance the stack of energy storage cells (BAT1, . . . , BATn) to be connected depending on the comparison of coded reference voltage (Vref) and cell voltages (VBAT1, . . . , VBATn). The invention also relates to a voltage balancing device and method for cell balancing, particularly for voltage balancing of a stack of batteries.