SEMI-ACTIVE ARCHITECTURES FOR BATTERIES HAVING TWO DIFFERENT CHEMISTRIES

• US 20150202983A1
• Filed: 01/23/2014
• Published: 07/23/2015
• Est. Priority Date: 01/23/2014
• Status: Active Grant

• Current Assignee: CPS Technology Holdings, LLC
• Original Assignee: Johnson Controls Technology Company (Johnson Controls International plc)
• Inventors: Le, Daniel B., Wyatt, Perry M., Mascarenhas, Ryan S., Sisk, Brian C.
• Granted Patent: US 9,527,401 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 53/22 Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 7/10 Dynamic electric regenerative braking B60L7/22 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/06 Lead-acid accumulators semi-lead accumulators H01M10/20
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A 12 volt automotive battery system includes a first battery coupled to an electrical system, in which the first battery includes a first battery chemistry. The first battery is charged with a relatively constant first voltage, in which an alternator outputs the relatively constant first voltage. The 12 volt automotive battery system further includes a second battery coupled in parallel with the first battery and selectively coupled to the electrical system via a DC/DC converter, in which the second battery includes a second battery chemistry that has a higher coulombic efficiency than the first battery chemistry. The DC/DC converter boosts the first voltage to a second voltage to charge the second battery during regenerative braking, in which the second voltage is higher than a maximum charging voltage of the first battery.

Claims

1. A 12 volt automotive battery system, comprising:

a first battery configured to be coupled to an electrical system and to be charged with a relatively constant first voltage, wherein an alternator outputs the relatively constant first voltage, and the first battery comprises a first battery chemistry;

a second battery coupled in parallel with the first battery and configured to be selectively coupled to the electrical system via a DC/DC converter, wherein the second battery comprises a second battery chemistry that has a higher coulombic efficiency than the first battery chemistry, and the DC/DC converter is configured to boost the first voltage to a second voltage to charge the second battery during regenerative braking, wherein the second voltage is higher than a maximum charging voltage of the first battery.

2. The battery system of claim 1, comprising a battery control unit configured to maintain the first battery generally at a full state of charge before regenerative braking to enable the first battery to steer power generated during regenerative braking to the second battery using internal resistance of the first battery.

3. The battery system of claim 1, wherein the maximum charging voltage of the first battery is lower than maximum charging voltage of the second battery.

4. The battery system of claim 1, wherein the second voltage is between 14.8 to 16.8 volts when the first battery chemistry is lead-acid and the second battery chemistry is lithium nickel manganese cobalt oxide.

5. The battery system of claim 1, comprising a housing to house the first battery, the second battery, and the DC/DC converter, wherein the housing comprises a positive terminal and a ground terminal coupled to the first battery and selectively coupled to the second battery via the DC/DC converter, wherein the positive terminal and the ground terminal are configured to couple to the electrical system.

6. The battery system of claim 1, wherein the first battery is configured to produce oxygen gas or hydrogen gas when charge at a voltage above the maximum charging voltage.

7. The battery system of claim 1, wherein the first battery is configured to be selectively coupled to the electrical system via a switch.

8. The battery system of claim 1, wherein the DC/DC converter comprises:

a converter path configured to boost the first voltage to the second voltage;

a bypass path configured to enable the second battery to supply power when voltage of the second battery is higher than the first voltage; and

a DC/DC converter switch configured to selectively switch between the converter path and the bypass path.

9. The battery system of claim 1, wherein the first battery and the second battery are non-voltage matched such that a voltage range of the second battery is higher than a voltage range of the first battery and do not overlap, wherein the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

10. The battery system of claim 1, wherein the first battery chemistry is lead-acid and the second battery chemistry is lithium nickel manganese cobalt oxide, lithium nickel cobalt aluminum oxide, or lithium nickel manganese cobalt oxide-lithium nickel cobalt aluminum oxide.

11. The battery system of claim 1, wherein the first battery and the second battery are partial voltage matched such that a voltage range of the first battery and a voltage range of the second battery partially overlap, wherein voltage overlap corresponds to between 1-74% of the second battery'"'"'s total state of charge range, and the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

12. The battery system of claim 1, wherein the first battery chemistry is lead-acid and the second battery chemistry is lithium-titanate/lithium nickel manganese cobalt oxide, nickel-metal hydride, or lithium iron phosphate.

13. A method for operating a 12 volt automotive battery system, comprising:

outputting a relatively constant first voltage from an alternator;

charging a first battery with the first voltage, wherein the first battery comprises a first battery chemistry; and

boosting the first voltage to a second voltage with a DC/DC converter to charge a second battery coupled in parallel with the first battery during regenerative braking, wherein the second voltage is higher than a maximum charging voltage of the first battery, and the second battery comprises a second battery chemistry that has a higher coulombic efficiency than the first battery chemistry.

14. The method of claim 13, wherein the second voltage is between 14.8 to 16.8 volts when the first battery chemistry is lead-acid and the second battery chemistry is lithium nickel manganese cobalt oxide.

15. The method of claim 13, wherein boosting the first voltage to the second voltage with the DC/DC converter comprises selecting a boost path in the DC/DC converter with a DC/DC converter switch configured to selectively switch between the converter path and a bypass path.

16. The method of claim 13, wherein charging the first battery with the first voltage comprises maintaining the first battery generally at a full state of charge before regenerative braking to enable the first battery to steer power generated during regenerative braking to the second battery using internal resistance of the first battery.

17. The method of claim 13, wherein the maximum charging voltage of first battery is lower than maximum charging voltage of the second battery.

18. The method of claim 13, wherein the first battery and the second battery are non-voltage matched such that a voltage range of the second battery is higher than a voltage range of the first battery and do not overlap, wherein the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

19. The method of claim 13, wherein the first battery and the second battery are partial voltage matched such that a voltage range of the first battery and a voltage range of the second battery partially overlap, wherein voltage overlap corresponds to between 1-74% of the second battery'"'"'s total state of charge range, and the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

20. A 12 volt automotive battery system, comprising:

a first battery configured to be charged with a relatively constant first voltage, wherein the relatively constant first voltage is output by an alternator, and the first battery comprises a first battery chemistry; and

a DC/DC converter comprising;

a converter path configured to charge a second battery coupled in parallel with the first battery during regenerative braking by boosting the first voltage to a second voltage;

a bypass path configured to enable the second battery to supply power when voltage of the second battery is higher than the first voltage and the second battery has a positive state of charge; and

a DC/DC converter switch configured to selectively switch between the converter path and the bypass path.

21. The battery system of claim 20, wherein the second voltage is higher than a maximum charging voltage of the first battery.

22. The battery system of claim 21, wherein the first battery is configured to produce oxygen gas or hydrogen gas when charged at a voltage above the maximum charging voltage.

23. The battery system of claim 20, comprising a housing to house the first battery, the second battery, and the DC/DC converter, wherein the housing comprises a positive terminal and a ground terminal coupled to the first battery and selectively coupled to the second battery via the DC/DC converter, wherein the positive terminal and the ground terminal are configured to couple to an electrical system.

24. The battery system of claim 20, wherein the first battery and the second battery are non-voltage matched such that a voltage range of the second battery is higher than a voltage range of the first battery and do not overlap, wherein the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

25. The battery system of claim 20, wherein the first battery chemistry is lead-acid and the second battery chemistry is lithium nickel manganese cobalt oxide, lithium nickel cobalt aluminum oxide, or lithium nickel manganese cobalt oxide-lithium nickel cobalt aluminum oxide.

26. The battery system of claim 20, wherein the first battery and the second battery are partial voltage matched such that a voltage range of the first battery and a voltage range of the second battery partially overlap, wherein voltage overlap corresponds to between 1-74% of the second battery'"'"'s total state of charge range, and the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

27. The battery system of claim 20, wherein the first battery chemistry is lead-acid and the second battery chemistry is lithium-titanate/lithium nickel manganese cobalt oxide, nickel-metal hydride, or lithium iron phosphate.

28. A method for operating a 12 volt automotive battery system, comprising:

outputting a relatively constant first voltage from an alternator;

charging the first battery with the first voltage, wherein the first battery comprises a first battery chemistry;

selecting a converter path in a DC/DC converter with a battery control unit to charge a second battery coupled in parallel with the first battery during regenerative braking by boosting the first voltage to a second voltage; and

selecting a bypass path in the DC/DC converter with the battery control unit to enable the second battery to supply power when voltage of the second battery is higher than the first voltage.

29. The method of claim 28, wherein the second voltage is higher than a maximum charging voltage of the first battery.

30. The method of claim 28, where the maximum charging voltage of the first battery is lower than maximum charging voltage of the second battery.

31. The method of claim 28, wherein the first battery and the second battery are non-voltage matched such that a voltage range of the second battery is higher than a voltage range of the first battery and do not overlap, wherein the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

32. The method of claim 28, wherein the first battery and the second battery are partial voltage matched such that a voltage range of the first battery and a voltage range of the second battery partially overlap, wherein voltage overlap corresponds to between 1-74% of the second battery'"'"'s total state of charge range, and the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

33. A 12 volt automotive battery system, comprising:

a first battery configured to be charged with a relatively constant first voltage, wherein an alternator outputs the relatively constant first voltage, and the first battery comprises a first battery chemistry; and

a DC/DC converter comprising;

a converter path configured to enable a second battery coupled in parallel with the first battery to supply power when the second battery has a positive state of charge by boosting voltage of the second battery to the first voltage;

a bypass path configured to enable the second battery to be charged during regenerative braking when the voltage of the second battery is lower than the first voltage; and

a DC/DC converter switch configured to selectively switch between the converter path and the bypass path.

34. The battery system of claim 33, wherein the first battery and the second battery are voltage matched such that a voltage range of the first battery and a voltage range of the second battery largely overlap, wherein voltage overlap corresponds to between 75-100% of the second battery'"'"'s total state of charge range, and the voltage range of the first battery comprises open circuit voltages of the first battery between 0-100% state of charge and the voltage range of the second battery comprises open circuit voltages of the second battery between 0-100% state of charge.

35. The battery system of claim 33, wherein the first battery chemistry is lead-acid and the second battery chemistry is lithium-titanate/lithium manganese oxide or nickel-zinc.