Energy storage device with heating device and method for heating energy cells of an energy storage device

摘要

The invention relates to an energy storage device (1) for generating an n-phase supply voltage for an electric machine (2), wherein n≧1, with n energy supply branches which are connected in parallel and which can each be connected to one of n phase conductors (2a, 2b, 2c), wherein each of the energy supply branches has a large number of energy storage modules (1a, 1b) which are connected in series and which each comprise: an energy storage cell module (5, 7) which has at least one energy storage cell (5a, 7a) and a coupling device (3), which is designed to connect the energy storage cell module (5, 7) selectively into the respective energy supply branch or to bridge said energy storage cell module, wherein in each case at least one of the energy storage modules (1b) also has in each case one heating element (8) for the at least one energy storage cell (7a); and a heating device (9), which is connected to the heating elements (8) and which is designed to actuate the heating elements (8) for heating the energy storage cells (7a) in the groups of energy storage modules (1b).