Power supply system, vehicle with the same, temperature rise control method of power storage device and computer-readable recording medium bearing program for executing computer to perform temperature rise control of power supply device

• US 7,888,811 B2
• Filed: 06/14/2007
• Issued: 02/15/2011
• Est. Priority Date: 07/25/2006
• Status: Expired due to Fees

• Current Assignee: Hon Hai Precision Industry Co., Ltd., Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ishikawa, Tetsuhiro, Ichikawa, Shinji
• Primary Examiner(s): Deberadinis; Robert L.
• Application Number:
  US12/308,683
• Publication Number:
  US 20090315396A1
• Time in Patent Office: 1,342 Days
• Field of Search: 307/9.1
• US Class Current: 307/9.1
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60L 58/27 by heating
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H02J 7/1415 with a generator driven by a prime mover other than the motor of a vehicle
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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

Abstract

A converter ECU controls a converter to transmit an electric power between a power storage device and a power storage unit through a main positive bus line and a main negative bus line during temperature rise control of the power storage device. Specifically, converter ECU sets a target voltage of the converter to a second voltage value lower than a first voltage value when a voltage value reaches the first voltage value, and sets the target voltage of the converter to the first voltage value when the voltage value reaches the second voltage value.

Claims

1. A power supply system capable of supplying an electric power to a load device, comprising:

a chargeable and dischargeable power storage device;

a power line configured to be capable of supplying and receiving the electric power between the power supply system and said load device;

a converter arranged between said power storage device and said power line for performing voltage conversion between said power storage device and said power line;

a chargeable and dischargeable power storage unit connected to said power line;

a control device controlling said converter by setting a predetermined target value; and

a voltage sensor sensing a voltage on said power line, wherein

during temperature rise control for raising a temperature of at least one of said power storage device and said power storage unit, said control device sets said target value such that said converter passes the electric power from said power storage device through said power line to said power storage unit when the voltage sensed by said voltage sensor reaches a lower limit value, and sets said target value such that said converter passes the electric power from said power storage unit through said power line to said power storage device when said sensed voltage reaches an upper limit value.

2. The power supply system according to claim 1, wherein

said upper and lower limit values are set according to a state of said power storage device.

3. The power supply system according to claim 2, wherein

said upper and lower limit values are set to larger values as the temperature of said power storage device lowers.

4. The power supply system according to claim 2, wherein

said upper and lower limit values are set to larger values as a state quantity representing a state of charge of said power storage device decreases.

5. The power supply system according to claim 1, wherein

said upper and lower limit values are set to values being close to and not exceeding the voltage upper limit value of said power line.

6. The power supply system according to claim 1, wherein

said upper and lower limit values are set to values being close to and not lower than a voltage of said power storage device when the temperature of said power storage unit is to be raised preferentially.

7. The power supply system according to claim 1, wherein

said control device controls said converter such that the voltage on said power line attains a target voltage, sets said target voltage to a first voltage value higher than said lower limit value when said sensed voltage reaches said lower limit value during said temperature rise control, and sets said target voltage to a second voltage value lower than said upper limit value when said sensed voltage reaches said upper limit value during said temperature rise control.

8. The power supply system according to claim 7, wherein

said first voltage value is said upper limit value, and

said second voltage value is said lower limit value.

9. The power supply system according to claim 1, wherein

said control device controls said converter such that a charge/discharge current of said power storage device attains a target current, sets said target current to a first current value such that said power storage device discharges when said sensed voltage reaches said lower limit value during said temperature rise control, and sets said target current to a second current value such that said power storage device is charged when said sensed voltage reaches said upper limit value during said temperature rise control.

10. The power supply system according to claim 9, wherein

said second current value is equal to a value obtained by inverting a sign of said first current value.

11. The power supply system according to claim 1, wherein

said power storage device includes a secondary battery, and

said power storage unit includes a capacitor.

12. The power supply system according to claim 1, wherein

said power storage unit is a smoothing capacitor reducing an electric power variation component of said power line.

13. A vehicle comprising:

the power supply system according to claim 1; and

a drive power generating unit generating a drive power of the vehicle by receiving the electric power supplied from said power supply system.

14. A temperature rise control method of a power storage device in a power supply system capable of supplying an electric power to a load device,

said power supply system including:

the chargeable and dischargeable power storage device,

a power line configured to be capable of transmitting the electric power between the power supply system and said load device,

a converter arranged between said power storage device and said power line for performing voltage conversion between said power storage device and said power line,

a chargeable and dischargeable power storage unit connected to said power line, and

a voltage sensor sensing a voltage on said power line,

said temperature rise control method comprising;

a first step of controlling said converter by setting a predetermined target value;

a second step of determining whether the voltage sensed by said voltage sensor reached a lower limit value or not;

a third step of setting said target value such that said converter passes the electric power from said power storage device through said power line to said power storage unit, when it is determined that said sensed voltage reached said lower limit value;

a fourth step of determining whether said sensed voltage reached an upper limit value or not; and

a fifth step of setting said target value such that said converter passes the electric power from said power storage unit through said power line to said power storage device, when it is determined that said sensed voltage reached said upper limit value.

15. A computer-readable. recording medium bearing a program for causing a computer to execute temperature rise control of a power storage device in a power supply system capable of supplying an electric power to a load device,

said power supply system including:

the chargeable and dischargeable power storage device,

a power line configured to be capable of transmitting the electric power between the power supply system and said load device,

a converter arranged between said power storage device and said power line for performing voltage conversion between said power storage device and said power line,

a chargeable and dischargeable power storage unit connected to said power line, and

a voltage sensor sensing a voltage on said power line,

said recording medium bearing the program for causing the computer to execute;

a first step of controlling said converter by setting a predetermined target value;

a second step of determining whether the voltage sensed by said voltage sensor reached a lower limit value or not;

a third step of setting said target value such that said converter passes the electric power from said power storage device through said power line to said power storage unit, when it is determined that said sensed voltage reached said lower limit value;

a fourth step of determining whether said sensed voltage reached an upper limit value or not; and

a fifth step of setting said target value such that said converter passes the electric power from said power storage unit through said power line to said power storage device, when it is determined that said sensed voltage reached said upper limit value.