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1. (WO2018162602) SUBMARINE AND METHOD FOR OPERATING A BATTERY-FED ELECTRIC DRIVE SYSTEM OF A SUBMARINE

Pub. No.:    WO/2018/162602    International Application No.:    PCT/EP2018/055682
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Thu Mar 08 00:59:59 CET 2018
IPC: B60L 11/18
Applicants: THYSSENKRUPP MARINE SYSTEMS GMBH
THYSSENKRUPP AG
Inventors: JANKE, Alexander
DANNENBERG, Norbert
Title: SUBMARINE AND METHOD FOR OPERATING A BATTERY-FED ELECTRIC DRIVE SYSTEM OF A SUBMARINE
Abstract:
Submarines have a propulsion network (10) for supplying an electric drive. A plurality of parallel battery strings (11, 12) is associated with the propulsion network (10) for continuous energy supply. The parallel connection of battery strings (11, 12) is problematic, because equalizing currents can flow between the battery strings (11, 12). The avoidance of equalizing currents by means of DC-DC converters (13, 14) can lead to overcharging and deep discharging of the individual strings (11, 12). The invention relates to a submarine and to a method for operating a drive system of a submarine, wherein the states of charge (SOC) of at least two battery strings (11, 12) of a propulsion network (10) are synchronized in that the respective states of charge of the battery strings (11, 12) are measured by respective battery management systems (BMSs) (19) and respective string voltages of the battery strings (11, 12) are set by respective DC-DC converters (13, 14) in accordance with the respective measured states of charge.