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).

主权项

1. An energy storage device for generating an n-phase supply voltage for an electric machine, wherein n ≧1, the energy storage device comprising:
n energy supply branches, which are connected in parallel and can be connected in each case to one of n phase conductors, wherein each of the energy supply branches has a multiplicity of energy storage modules, which are connected in series, each of the energy storage modules including
an energy storage cell module, which has at least one energy storage cell, anda coupling device, which is designed to selectively switch the energy storage cell module into the respective energy supply branch or to bypass said module,wherein at least one of the energy storage modules also has one heating element, the one heating element configured to heat only one energy storage module,wherein at least one of the energy storage modules does not include a heating element; and a heating device, which is connected to the heating elements and is designed to control the heating elements in order to heat the at least one energy storage cell of the energy storage cell modules of each energy supply branch, and wherein the coupling devices of each of the plurality of energy storage modules are configured to switch the at least one energy storage module having the one heating element into its respective energy supply branch and to bypass the energy storage modules that do not include a heating element in response to a condition being detected.