Battery having cell voltage and battery current detection and comprising only one electrical isolation device

摘要

A battery includes a plurality of battery cells connected in series between a positive terminal and a negative terminal and a resistor connected in series with the battery cells. The battery also includes a plurality of cell voltage detection units which each include a plurality of voltage measurement inputs connected to a respective group of the battery cells. The battery is configured to determine cell voltages of the battery cells connected to the respective cell voltage detection unit. The cell voltage detection units are connected to each other by a communication bus and are configured to transmit, via the communication bus, the determined cell voltages to a microcontroller which is galvanically decoupled from the cell voltage detection units by an electrical isolation device. The resistor includes a first connection connected to a selected voltage measurement input of one of the cell voltage detection units.

主权项

1. A battery comprising:
a plurality of battery cells connected in series between a positive terminal and negative terminal; a resistor connected in series with the plurality of battery cells; a plurality of cell voltage detection units, which each have a plurality of voltage measurement inputs connected to a respective group of battery cells of the plurality of battery cells, each cell voltage detection unit being configured to determine cell voltages of the connected respective group of battery cells; and an amplifier connected between the resistor and the selected voltage measurement input of said one of the cell voltage detection units, the amplifier configured to amplify a voltage present across the resistor, wherein:
the cell voltage detection units of the plurality of cell voltage detection units are connected to one another by a communications bus and are configured to communicate the determined cell voltages via the communications bus to a microcontroller, which is DC-decoupled from the cell voltage detection units by an electrical isolation apparatus,
a gain factor of the amplifier is predetermined such that a maximum permissible current of the battery effects an output voltage of the amplifier, which is lower than a maximum permissible input voltage of voltage measurement inputs of said one of the cell voltage detection units, andthe resistor has at least one first connection connected to a selected voltage measurement input of one of the cell voltage detection units.