Bayerische Motoren Werke Aktiengesellschaft

Max Von Groll

Simon Lux

Oliver Bohlen

Elvis Delbono

An energy store has at least one energy storage module with a plurality of energy storage cells. The energy storage cells are each electrically coupled to a monitoring unit. Each monitoring unit is designed to discharge the respective energy storage cell by use of a specified symmetry current in an active operating state. The method operates the energy store by performing the acts of: detecting an open-circuit voltage of each energy store cell and determining a discharge duration for each energy storage cell as a function of the open-circuit voltage of the energy storage cell and a specified target discharge voltage value; and controlling each monitoring unit in order to discharge the respective energy storage cell by use of the specified symmetry current for the discharge duration associated with the respective energy storage cell.

Method and device for operating an energy store

A battery module having a controllable external heat sink and methods of operating the battery module are provided. According to an aspect of the invention, the battery module includes a battery cell, an external circuit connected to the battery cell, and a controller that controls the external circuit. The external circuit includes a first switch and a heat sink. If an internal short circuit within the battery cell is detected, the controller closes the first switch in order to generate heat in the heat sink.

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Palo Alto, CA, United States of America

Max Von Groll