Method and Circuit Arrangement for Determining the Coulombic Efficiency of Battery Modules

摘要

The disclosure relates to a method for determining a Coulombic efficiency of battery modules of a rechargeable battery with a circuit arrangement connected to the battery modules. The circuit arrangement has multiple current paths, each of which has a series circuit of switch modules and at least one power semiconductor element which can be operated in a linear mode in order to regulate the current flowing through the respective current path, and one of the battery modules is connected to each of the switch modules. Each of the switch modules is configured as a switch module for selectively connecting the connected battery module into the respective current path or to alternatively remove the connected battery module from the respective current path. In each of the current paths at least one of the battery modules is selected with the switch module.

主权项

1. A method for determining a Coulombic efficiency of battery modules of a rechargeable battery with a circuit arrangement connected to the battery modules, the circuit arrangement having a plurality of current paths, each current path having a series circuit of switching modules and at least one power semiconductor element configured to be operated in the linear mode and intended to regulate current flowing through the respective current path, and one of the battery modules being connected to each of the switching modules, and each of the switching modules being in the form of a switching module configured to selectively connect the connected battery module in the respective current path or for alternatively removing the connected battery module from a respective current path, comprising:
selecting and connecting at least one of the battery modules in the respective current path with the switching modules, while all other battery modules the respective current path are removed from the respective current path by the switching modules; and subjecting the selected at least one battery module to at least one discharging process and at least one charging process via the respective current path, the corresponding current being accurately set during charging and discharging of the selected at least one battery module in the respective current path by the power semiconductor element which is operated in the linear mode; and determining corresponding charge quantities during charging and discharging by integrating the current over time.