BATTERY SYSTEM FOR MICRO-HYBRID VEHICLES COMPRISING HIGH-EFFICIENCY CONSUMERS

摘要

The invention relates to a battery system for a motor vehicle comprising an internal combustion engine, said battery system comprising at least one starting circuit, a low-voltage on-board supply system, and an on-board supply system with an increased voltage. The starting circuit has a first battery (10) and a starter (11) that is connected, or can be connected, to the first battery (10), said starter being used to start the internal combustion engine on a starter signal. The low-voltage on-board supply system has a second battery (15) used to produce a first voltage and to transmit same to the low-voltage on-board supply system, and at least one electrical consumer (14-2). The on-board supply system with increased voltage has a third battery (20) used to produce a second voltage higher than the first voltage and to transmit said second voltage to the low-voltage on-board supply system, and an electric generator (13-2) that can be operated by the internal combustion engine and is used to produce a third voltage higher than the second voltage and to transmit said third voltage to the on-board supply system with increased voltage. The on-board supply system with increased voltage is connected to the low-voltage on-board supply system by means of a first coupling unit (16) used to draw electrical energy from the on-board supply system with increased voltage and to supply said energy to the low-voltage on-board supply system. The low-voltage supply system is connected to the starter circuit by means of a second coupling unit (17) used to draw electrical energy from the low-voltage on-board supply system and to supply said energy to the starter circuit. The invention also relates to a motor vehicle comprising a corresponding battery system.