Battery system for micro-hybrid vehicles comprising high-efficiency consumers

Patent metadata

Field	Value
Publication number	US-9475439-B2
Application number	US-201113521834-A
Country	US
Kind code	B2
Filing date	Jan 19, 2011
Priority date	Jan 27, 2010
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A battery system for a motor vehicle having an internal combustion engine includes 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 and a starter that is configured to be connected to the first battery. The low-voltage supply system has at least one electrical consumer and a second battery configured to produce a first voltage. The supply system with increased voltage has an electrical generator and a third battery configured to produce a second voltage that is higher than the first voltage. The electric generator is configured to produce a third voltage that is higher than the second voltage. A first coupling connects the supply system with increased voltage to the low-voltage supply system and transfers energy therebetween. A second coupling connects the low-voltage on-board supply system to the starter circuit.

First claim

The invention claimed is:

1. A battery system for a motor vehicle having an internal combustion engine, comprising:
a starter circuit comprising:
a first battery, and
a starter which is configured to be connected to the first battery and is configured to start the internal combustion engine in response to a starter signal;

a low-voltage on-board electrical system comprising:
a second battery which is configured to generate a first voltage and to output the first voltage to the low-voltage on-board electrical system, and
at least one electrical consumer; and

an on-board electrical system with an increased voltage comprising:
a third battery which is configured to generate a second voltage, which is higher than the first voltage, and to output the second voltage to the on-board electrical system with an increased voltage, and
an electrical generator which is configured to be operated by the internal combustion engine and to generate a third voltage, which is higher than the second voltage, and to output the third voltage to the on-board electrical system with an increased voltage;

wherein the on-board electrical system with an increased voltage is connected to the low-voltage on-board electrical system by a first coupling unit which is configured to draw electrical energy from the on-board electrical system with an increased voltage and to supply electrical energy to the low-voltage on-board electrical system; and
wherein the low-voltage on-board electrical system is connected to the starter circuit by a second coupling unit which is configured to draw electrical energy from the low-voltage on-board electrical system and to supply electrical energy to the starter circuit.

2. The battery system as claimed in claim 1 , wherein at least one of the first battery, the second battery, and the third battery is configured as a lithium-ion battery.

3. The battery system as claimed in claim 1 , wherein the on-board electrical system with an increased voltage has at least one high-power consumer.

4. The battery system as claimed in claim 1 , wherein the at least one electrical consumer of the low-voltage on-board electrical system is a music system, a navigation device, or an electric window winder.

5. The battery system as claimed in claim 1 , further comprising a diode, an anode of said diode being connected to the low-voltage on-board electrical system and a cathode of said diode being connected to the starter circuit.

6. The battery system as claimed in claim 1 , wherein the first battery is configured to generate the first voltage and to output the first voltage to the starter circuit.

7. The battery system as claimed in claim 1 , wherein one or more of the first coupling unit and the second coupling unit are DC/DC converters.

8. The battery system as claimed in claim 1 , wherein the first voltage is between 10 V and 15 V.

9. The battery system as claimed in claim 1 , wherein the second voltage is between 24 V and 45 V.

10. A motor vehicle, comprising:
an internal combustion engine; and
a battery system including:
a starter circuit comprising:
a first battery, and
a starter which is configured to be connected to the first battery and is configured to start the internal combustion engine in response to a starter signal;

a low-voltage on-board electrical system comprising:
a second battery which is configured to generate a first voltage and to output the first voltage to the low-voltage on-board electrical system, and
at least one electrical consumer; and

an on-board electrical system with an increased voltage comprising:
a third battery which is configured to generate a second voltage, which is higher than the first voltage, and to output the second voltage to the on-board electrical system with an increased voltage, and
an electrical generator which is configured to be operated by the internal combustion engine and to generate a third voltage, which is higher than the second voltage, and to output the third voltage to the on-board electrical system with an increased voltage;

wherein the on-board electrical system with an increased voltage is connected to the low-voltage on-board electrical system by a first coupling unit which is configured to draw electrical energy from the on-board electrical system with an increased voltage and to supply electrical energy to the low-voltage on-board electrical system; and
wherein the low-voltage on-board electrical system is connected to the starter circuit by a second coupling unit which is configured to draw electrical energy from the low-voltage on-board electrical system and to supply electrical energy to the starter circuit.

11. The battery system as claimed in claim 3 , wherein the at least one high-power consumer is an electrical air conditioning compressor, an electrical heating system, or an electric motor.

12. The motor vehicle as claimed in claim 10 , wherein the motor vehicle is a micro-hybrid motor vehicle.

Assignees

• Fetzer Joachim
• Butzmann Stefan
• Fink Holger
• Samsung Sdi Co Ltd
• Bosch Gmbh Robert

Inventors

• Fetzer Joachim
• Butzmann Stefan
• Fink Holger

Classifications

• B60R16/033 Primary

  characterised by the use of electrical cells or batteries (for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36) · CPC title

• Y02T10/705

  Cross-Sectional Technologies · mapped topic

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• Y02T10/7016

  Cross-Sectional Technologies · mapped topic

• B60R16/03

  for supply of electrical power to vehicle subsystems {or for (circuit arrangements for charging batteries H02J7/00)} · CPC title