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

• US 9,475,439 B2
• Filed: 01/19/2011
• Issued: 10/25/2016
• Est. Priority Date: 01/27/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Original Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Inventors: Fetzer, Joachim, Butzmann, Stefan, Fink, Holger
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): PEREZ BORROTO, ALFONSO
• Application Number:
  US13/521,834
• Publication Number:
  US 20130026823A1
• Time in Patent Office: 2,106 Days
• US Class Current: 1/1
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60R 16/033 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 Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

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.

Claims

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.

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.

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.

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