BATTERY TEMPERATURE CONTROL SYSTEM

• US 20100085019A1
• Filed: 10/02/2009
• Published: 04/08/2010
• Est. Priority Date: 10/03/2008
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Masuda, Eiji
• Granted Patent: US 8,575,897 B2
• Time in Patent Office: Days
• US Class Current: 320/152
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A battery temperature control system, in temperature rise control, sets a maximum chargeable current and a maximum dischargeable current based on detection values of current, voltage, and temperature of a high-voltage battery, and and controls charging/discharging power so that the current of the high-voltage battery does not exceed the maximum chargeable current or the maximum dischargeable current. For this reason, it is possible to prevent the high-voltage battery from abnormal heating and promptly raise its temperature according to change in the internal state of the high-voltage battery. In this control, a plurality of electrical equipment is selectively used. The amplitude of charging/discharging is controlled to reduce vibration noise and driving force fluctuation.

Claims

1. A battery temperature control system that carries out temperature rise control to raise temperature of a battery mounted in a vehicle by internal heating due to charging and/or discharging of the battery, the battery temperature control system comprising:

current detecting means for detecting a current of the battery;

voltage detecting means for detecting a voltage of the battery;

temperature detecting means for detecting a temperature of the battery;

maximum chargeable/dischargeable current setting means for setting a maximum chargeable current and a maximum dischargeable current based on the detected current, voltage, and temperature of the battery; and

temperature rise controlling means for controlling charging/discharging power so that the current of the battery does not exceed the maximum chargeable current or the maximum dischargeable current thereby to raise the temperature of the battery.

2. The battery temperature control system of claim 1,

wherein the temperature rise controlling means compares the maximum chargeable current, and the maximum dischargeable current with each other, selects the current larger in absolute value, and controls the charging/discharging power thereby to attain the selected current.

3. The battery temperature control system of claim 1, further comprising:

use range setting means for setting a current use range and a voltage use range of the battery,

wherein the temperature rise controlling means limits the charging/discharging power so that the current and the voltage of the battery fall within the current use range and the voltage use range set by the use range setting means, respectively.

4. The battery temperature control system of claim 1,

wherein the maximum chargeable/dischargeable current setting means estimates an internal resistance of the battery based on the temperature of the battery detected by the temperature detecting means and sets the maximum chargeable current and the maximum dischargeable current in accordance with the estimated internal resistance.

5. The battery temperature control system of claim 1, further comprising:

driving intention detecting means for detecting a driver'"'"'s driving intention; and

means for prohibiting the temperature rise control by the temperature rise controlling means based on the driver'"'"'s driving intention detected by the driving intention detecting means.

6. The battery temperature control system of claim 1, further comprising:

remaining capacity determining means for determining a remaining capacity of the battery; and

means for prohibiting, when the remaining capacity of the battery detected by the remaining capacity determining means is out of a predetermined range, at least power control in a direction in which the remaining capacity gets out of the predetermined range in the temperature rise control by the temperature rise controlling means.

7. A battery temperature control system that carries out temperature rise control to raise temperature of a battery mounted in a vehicle by internal heating due to repetitive operation of charging and discharging of the battery, the battery temperature control system comprising:

current detecting means for detecting a current of the battery;

voltage detecting means for detecting a voltage of the battery;

temperature detecting means for detecting a temperature of the battery;

maximum chargeable/dischargeable current setting means for setting a maximum chargeable current and a maximum dischargeable current based on the detected current, voltage, and temperature of the battery; and

temperature rise controlling means for carrying out the temperature rise control by setting a switching period and/or amplitude of charging/discharging in the temperature rise control based on the maximum chargeable current and the maximum dischargeable current.

8. The battery temperature control system of claim 7, further comprising:

use range setting means for setting a voltage use range of the battery,

wherein the temperature rise controlling means sets the switching period and/or the amplitude of charging/discharging in the temperature rise control so that the voltage of the battery falls within the voltage use range set by the use range setting means.

9. The battery temperature control system of claim 7,

wherein the maximum chargeable/dischargeable current setting means estimates the internal resistance of the battery based on the temperature of the battery detected by the temperature detecting means and also takes the estimated internal resistance into account to set the maximum chargeable current and the maximum dischargeable current.

10. The battery temperature control system of claim 7,

wherein the battery is connected to a motor for driving a vehicle through a boost converter and an inverter.

11. A battery temperature control system that carries out temperature rise control to raise temperature of a battery mounted in a vehicle by charging and/or discharging of the battery, the battery temperature control system comprising:

a plurality of electrical equipment capable of operating charging and/or discharging of the battery; and

selecting means for selecting, from among the plurality of electrical equipment, one electrical equipment that operates charging and/or discharging of the battery based on at least one of a cycle period and an amplitude of charging and/or discharging of the battery thereby to carry out the temperature rise control.

12. The battery temperature control system of claim 11, further comprising:

abnormality detecting means for detecting an abnormality in which performance of at least one of the plurality of electrical equipment is limited or stopped,

wherein the selecting means selects the one electrical equipment that operates the charging and/or discharging of the battery in accordance with a result of detection by the abnormality detecting means.

13. The battery temperature control system of claim 12, further comprising:

detecting means for detecting at least one of the temperature, current, and voltage of electrical equipment as a target of abnormality detection,

wherein the abnormality detecting means detects any abnormality based on the result of detection by the detecting means.

14. The battery temperature control system of claim 11,

wherein the plurality of electrical equipment include at least two of a motor, a boost converter, and a DC-DC converter.

15. A battery temperature control system that carries out temperature rise control to raise temperature of a battery mounted in a vehicle by periodically repeating charging and/or discharging of the battery, the battery temperature control system comprising:

limiting means for limiting at least either of the cycle period and amplitude of charging and/or discharging of the battery so that vibration noise and/or driving force fluctuation is reduced during execution of the temperature rise control.

16. The battery temperature control system of claim 15,

wherein the limiting means limits one of the cycle period and the amplitude based on the other.

17. The battery temperature control system of claim 15, further comprising:

vehicle speed detecting means for detecting vehicle speed,

wherein the limiting means limits at least either the cycle period or the amplitude in accordance with the vehicle speed detected by the vehicle speed detecting means.

18. The battery temperature control system of claim 15, further comprising:

driving intention detecting means for detecting driver'"'"'s driving intention,

wherein the limiting means limits at least either the cycle period or the amplitude in accordance with the driver'"'"'s driving intention detected by the driving intention detecting means.