Portable electronic device with enhanced battery life and cooling

• US 6,570,362 B1
• Filed: 08/22/2000
• Issued: 05/27/2003
• Est. Priority Date: 08/22/2000
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Pal, Debabrata, Estes, Kurt, McDunn, Kevin, Shmagin, Irina, Gamota, Daniel
• Primary Examiner(s): TOATLEY, GREGORY J
• Application Number:
  US09/643,535
• Time in Patent Office: 1,008 Days
• Field of Search: 320/101, 320/150, 136/200, 136/205
• US Class Current: 320/101
• CPC Class Codes: H01L 23/38 Cooling arrangements using the Peltier effect
• CPC Class Codes: H01L 23/4275 by melting or evaporation of solids
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H10N 10/00 Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects integrated devices or assemblies of multiple devices H10N19/00

Abstract

Battery life and cooling are improved in an electronic device. A thermoelectric module and phase change material module are placed near a heat source in an electronic device. The thermoelectric module and phase change material module insulate a surface to be cooled on the electronic device. The thermoelectric module generates an electrical current in response to a temperature differential at opposite surfaces on the thermoelectric module. The phase change material module enhances or limits the temperature differential seen at the thermoelectric module. The electrical current generated by the thermoelectric module is used to charge a battery of the electronic device.

Claims

1. An electronic device comprising:

an electronic circuit;

a thermoelectric module, positioned proximate the electronic circuit; and

a phase change material coupled to the thermoelectric module.

2. The electronic device of claim 1 further comprising:

a battery coupled to the thermoelectric module.

3. The electronic device of claim 1 further comprising:

a rectifier coupled to the thermoelectric module; and

a battery coupled to the rectifier.

4. The electronic device of claim 1 further comprising:

a diode coupled to the thermoelectric module; and

a battery coupled to the diode.

5. The electronic device of claim 1 further comprising:

a heat source, for heating one surface of the thermoelectric module during normal operation of the electronic device.

6. The electronic device of claim 5 wherein the heat source comprises:

a printed circuit board and at least one electronic component.

7. The electronic device of claim 1 wherein the phase change material has a housing formed from a flexible metallic material.

8. The electronic device of claim 1 wherein the phase change material has a melting point that is below a maximum operating temperature of the electronic device.

9. The electronic device of claim 1 wherein the thermoelectric module comprises at least one Bi₂Te₃ thermocouple in a shape of an elongated ingot with a parallelogram cross-section.

10. The electronic device of claim 1 further comprising:

a device housing, for containing the electronic circuit, the thermoelectric module, and the phase change material.

11. The electronic device of claim 10 wherein the phase change material is closer to an external surface of the device housing than the thermoelectric module.

12. The electronic device of claim 11 wherein the thermoelectric module is attached to the electronic circuit.

13. The electronic device of claim 12 wherein the phase change material is attached to the thermoelectric module.

14. The electronic device of claim 10 wherein the thermoelectric module is closer to an external surface of the device housing than the phase change material.

15. The electronic device of claim 14 wherein the phase change material is attached to the electronic circuit.

16. The electronic device of claim 15 wherein the thermoelectric module is attached to the phase change material.

17. A method for recharging a battery in a electronic device, the method comprising the steps of:

operating the electronic device to produce heat;

converting heat from the electronic device into electricity;

deploying a phase change material within the electronic device to control an amount of heat that is converted into electricity; and

using the electricity to charge the battery.

18. The method of claim 17 wherein a thermoelectric module is used in the step of converting heat from the electronic device into electricity.

19. The method of claim 18 further comprising the step of converting heat to electricity even after the electronic device is turned off.