Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS20060162897 A1
Publication typeApplication
Application numberUS 11/043,131
Publication dateJul 27, 2006
Filing dateJan 27, 2005
Priority dateJan 27, 2005
Publication number043131, 11043131, US 2006/0162897 A1, US 2006/162897 A1, US 20060162897 A1, US 20060162897A1, US 2006162897 A1, US 2006162897A1, US-A1-20060162897, US-A1-2006162897, US2006/0162897A1, US2006/162897A1, US20060162897 A1, US20060162897A1, US2006162897 A1, US2006162897A1
InventorsJing-Yih Cherng
Original AssigneeAmita Technologies Inc. Ltd.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Heat dissipating apparatus
US 20060162897 A1
Abstract
A heat dissipating apparatus for a battery set or heat-generating electronic device. The heat dissipating apparatus includes a sealing envelope and a heat-guiding unit. The sealing envelope is composed of an upper film, a lower film sealed with the upper film and an accommodation space defined between the upper film and the lower film. The accommodation space is functioned to accommodate the heat-guiding unit and comprises a retaining region and empty regions. The heat-guiding unit includes a wick structure and a working fluid. The heat-guiding unit conveys massive heat by employing a gas-liquid phase transition thereof, whereby the heat-generating electronic device works in a relatively low temperature.
Images(5)
Previous page
Next page
Claims(9)
1. A heat dissipating apparatus comprising
a sealing envelope having an upper film, a lower film sealed with the upper film and an accommodation space defined between the upper film and the lower film; and
a heat-guiding unit arranged in the accommodation space and comprising a wick structure and a working fluid.
2. The heat dissipating apparatus as in claim 1, wherein the accommodation space comprises a retaining region and empty regions, the retaining region functioned to accommodate the heat-guiding unit.
3. The heat dissipating apparatus as in claim 1, wherein the accommodation space comprises a retaining region and empty regions, the retaining region functioned to accommodate the heat-guiding unit and the heat-guiding unit extending into the empty regions.
4. The heat dissipating apparatus as in claim 1, wherein the sealing envelope is made of flexible composite material.
5. The heat dissipating apparatus as in claim 1, wherein the sealing envelope is metal sheet.
6. The heat dissipating apparatus as in claim 5, wherein the metal sheet is aluminum sheet.
7. The heat dissipating apparatus as in claim 1, wherein the working fluid is attached to the wick structure.
8. The heat dissipating apparatus as in claim 1, wherein the wick structure is one of unwoven cloth, metal mesh, and sintered metal.
9. The heat dissipating apparatus as in claim 1, wherein the working fluid is one of water, methyl alcohol, acetone, ammonia, coolant and the mixture of above liquids.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention
  • [0002]
    The present invention relates to a heat dissipating apparatus, and more particularly to a heat dissipating apparatus used for battery set or heat-generating electronic device and employing gas-liquid phase transition of a heat-guiding unit to convey heat from the battery set or heat-generating electronic device.
  • [0003]
    2. Description of Prior Art
  • [0004]
    As the progress of electronic technology and the demand of consumer product, the electronic devices and electrical machines are powered by battery set composed of cells in serial or parallel connection to provide power. The battery set composed of cells can provide high power energy with low pollution. Therefore, the battery set can be advantageously applied to electrical tool, electrical motorcycle, and electrical car. However, there is huge transient current for battery set in those applications and the battery set has the problem of high temperature. Moreover, the chipset and CPU in computer become smaller and work in higher frequency. The heat dissipation for battery set and computer become serious issue,
  • [0005]
    Conventional heat dissipating apparatus for battery set comprises a metal pad between two adjacent cells to form a battery set. The metal pad provides thermal conduction for heat and conveys heat from the battery set. The conveyed heat is dissipated by air convection. However, the cells are arranged in stacked manner and the effective heat-dissipating area is not enough. The thermal conduction and heat-dissipating effect is limited and the battery life is also reduced. Moreover, the working principle of battery set involves with huge transient current. The heat generated is proportional to the square of current. The rate of heat generation will exceed the rate of heat dissipation by natural convection when there is huge transient current. Moreover, the temperature will further rise if the battery set is also charged. The battery set has safety problem if the temperature thereof exceeds 60 C. and the heat dissipating apparatus for battery set is not sufficient.
  • SUMMARY OF THE INVENTION
  • [0006]
    The present invention is to provide a heat dissipating apparatus used for heat-generating electronic device and employing gas-liquid phase transition of a heat-guiding unit to convey heat from the heat-generating electronic device, whereby the heat-generating electronic device works in a relatively low temperature.
  • [0007]
    Accordingly, the present invention provides a heat dissipating apparatus for a battery set or heat-generating electronic device. The heat dissipating apparatus comprises a sealing envelope and a heat-guiding unit. The sealing envelope is composed of an upper film, a lower film sealed with the upper film and an accommodation space defined between the upper film and the lower film. The accommodation space is functioned to accommodate the heat-guiding unit and comprises a retaining region and empty regions. The heat-guiding unit comprises a wick structure and a working fluid.
  • [0008]
    The above summaries are intended to illustrate exemplary embodiments of the invention, which will be best understood in conjunction with the detailed description to follow, and are not intended to limit the scope of the appended claims.
  • BRIEF DESCRIPTION OF DRAWING
  • [0009]
    The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself however may be best understood by reference to the following detailed description of the invention, which describes certain exemplary embodiments of the invention, taken in conjunction with the accompanying drawings in which:
  • [0010]
    FIG. 1 shows a perspective view of the heat dissipating apparatus of the present invention.
  • [0011]
    FIG. 2 shows an exploded view of the present invention used for a battery set.
  • [0012]
    FIG. 3 shows a sectional view of the present invention used for a battery set.
  • [0013]
    FIG. 4 shows the application of the present invention used for a battery set.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0014]
    FIG. 1 shows a perspective view of the heat dissipating apparatus of the present invention. The dissipating apparatus comprises a sealing envelope 10 and a heat-guiding unit 20.
  • [0015]
    The sealing envelope 10 is made of flexible composite material or metal sheet. The metal sheet could be aluminum foil or other material deformable by heat and could be of rectangular shape, rounded shape or other shape. In the shown embodiment the metal sheet is of rectangular shape. The sealing envelope 10 comprises an upper film 11, a lower film 12 sealed with the upper film 11 and an accommodation space 13 defined between the upper film 11 and the lower film 12.
  • [0016]
    The heat-guiding unit 20 is arranged in the accommodation space 13 of the sealing envelope 10 and divides the accommodation space 13 into a retaining region 131 and two empty regions 132. The retaining region 131 is functioned to accommodate the heat-guiding unit 20 and the heat-guiding unit 20 comprises a wick structure 21 and a working fluid 22 attached to the wick structure 21. The wick structure 21 could be one of unwoven cloth, metal mesh, sintered metal or other porous material. The working fluid 22 could be liquid with low boiling point such as water, methyl alcohol, acetone, ammonia, coolant or the mixture of above liquids. Moreover, the heat-guiding unit 20 could be extended to the empty regions 132 (not shown).
  • [0017]
    To assemble the heat dissipating apparatus of the present invention, the heat-guiding unit 20 is placed in the retaining region 131 and then a radio frequency heating machine is used to seal the peripheral of the sealing envelope 10. Moreover, an opening is preformed on one side of the sealing envelope 10 and working fluid 22 in injected into the sealing envelope 10. Afterward, the sealing envelope 10 is vacuumed and sealed to form the heat dissipating apparatus of the present invention.
  • [0018]
    With reference to FIGS. 2, 3 and 4, the heat dissipating apparatus of the present invention can be applicable to a battery set or a heat-generating electronic device. In the shown embodiment, the heat dissipating apparatus is used for a battery set. The battery set comprises a plurality of cells 3, which can be polymer lithium cells or lithium ion cells with their anodes and cathodes in serial or parallel connection. The heat dissipating apparatus of the present invention is placed between the cells 3. In the embodiment, the battery set is used to power, for example, an electric car. The cell 3 will have maximum output current when the electric car is started or drives uphill. The cell 3 will generate high thermal energy and the thermal energy is conveyed to the wick structure 21 to increase the temperature thereof.
  • [0019]
    When the temperature reaches a boiling point of the working fluid 22 of the wick structure 21, the working fluid 22 is vaporized and the pressure within the sealing envelope 10 is increased. Therefore, the vapor is driven to the empty region 132 at both sides of the accommodation space 13. The empty regions 132 are expanded due to the vapor and the thermal energy is conveyed by the vapor. The exterior portion of the sealing envelope 10 is in contact with air such that the vaporized working fluid 22 will be cooled to liquid. At this time the empty regions 132 are shrunk due to the condensation of the vapor into liquid. The working fluid 22 flows back to the retaining region 131. Moreover, the working fluid 22 quickly flows back due to the capillary action of the wick structure 21. Therefore, the cell 3 operates at a relatively low temperature.
  • [0020]
    Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4212347 *Dec 20, 1978Jul 15, 1980Thermacore, Inc.Unfurlable heat pipe
US5168921 *Dec 23, 1991Dec 8, 1992Thermacore, Inc.Cooling plate with internal expandable heat pipe
US5560423 *Jul 28, 1994Oct 1, 1996Aavid Laboratories, Inc.Flexible heat pipe for integrated circuit cooling apparatus
US5642776 *Feb 27, 1996Jul 1, 1997Thermacore, Inc.Electrically insulated envelope heat pipe
US6146779 *Apr 1, 1999Nov 14, 2000Plug Power Inc.Fluid flow plate, fuel cell assembly system, and method employing same for controlling heat in fuel cells
US6446706 *Jul 25, 2000Sep 10, 2002Thermal Corp.Flexible heat pipe
US6679318 *Nov 14, 2002Jan 20, 2004Allan P BakkeLight weight rigid flat heat pipe utilizing copper foil container laminated to heat treated aluminum plates for structural stability
US20040045730 *Sep 9, 2003Mar 11, 2004Garner Scott D.Thermal management system and method for electronics system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US8016024 *Sep 13, 2011Tamkang UniversityLoop heat pipe with flat evaportor having a wick with an internal chamber
US20080164010 *Mar 20, 2007Jul 10, 2008Shung-Wen KangLoop heat pipe with flat evaportor
Classifications
U.S. Classification165/46, 165/104.26, 257/E23.088
International ClassificationF28D15/02
Cooperative ClassificationF28D15/046, H01L23/427, F28D15/0241, F28D15/0275, H01L2924/0002
European ClassificationF28D15/04B, F28D15/02F, H01L23/427
Legal Events
DateCodeEventDescription
Jan 27, 2005ASAssignment
Owner name: AMITA TECHNOLOGIES INC. LTD., TAIWAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHERNG, JING-YIH;REEL/FRAME:016238/0869
Effective date: 20041230