Apparatus for use in an electrical drive system, and method for operating an apparatus of this kind

Abstract

A device and a method of using the device in an electric drive system, particularly in a hybrid drive system of a motor vehicle. The device has at least a first and second battery system, connected in parallel, where their load outputs are connect to a common load output. Each battery system has an energy storage and a pre-charging circuit which is linked to it such that, by way of an output of the pre-charging circuit, the load output of the battery systems is created. The load output of each battery system can be connected or disconnected by way of the pre-charging circuit at the common load output. The common load output is energetically linked directly to an input of an inverter of the device by way of an intermediate circuit capacitor.

Description

technical field [0001] The invention relates to a device for operating an electric drive system according to the preamble of claim 1 and a method for this according to the preamble of claim 5 . Background technique [0002] In the future, so-called "zero emission zones" will increasingly be provided, especially in inner cities. This is the zone in which only vehicles that drive without emissions are allowed. For example, buses and transport trucks in this area must be operated purely electrically, for example. [0003] In vehicles with a parallel hybrid drive, in addition to so-called hybrid driving, in which both the internal combustion engine and the electric motor drive the vehicle, there is also the possibility as a drive type to use only the electric motor when the internal combustion engine is switched off and The vehicle is thus driven emission-free. In order to be able to travel sufficient distances purely electrically, sufficient electrical energy must be provide...

AI Technical Summary

Problems solved by technology

This has the effect that the electric range and power performance are greatly limited

In order to control and thus avoid the asymmetry of the batteries connected in parallel, intermediate circuit electronics are required, which are very expensive and also have to be designed large and heavy in order to switch the high currents that flow in this case

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