# US 10,375,857 B2 · Pin fin heat sink with integrated phase change material and method

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- Number: US 10,375,857 B2
- Document ID: US10375857B2
- Status: Granted
- Kind: B2
- Application number: 15/280,074
- Filed: 2016-09-29
- Published: 2018-03-29
- Granted: 2019-08-06
- Earliest claimed: 2016-09-29
- Assignees: Hamilton Sundstrand Corporation
- Applicants: Hamilton Sundstrand Corporation
- Inventors: Scott R. Bouras
- Web page: https://patentgrep.com/patent/US10375857B2

## CPC

- H05K 7/20336: {Heat pipes, e.g. wicks or capillary pumps}
- F28D 20/021: {the latent heat storage material and the heat-exchanging means being enclosed in one container (F28D20/023 - F28D20/028 take precedence)}
- F28F 3/022: {the means being wires or pins}
- F28F 13/003: {by using permeable mass, perforated or porous materials (F28F13/18 takes precedence)}
- H05K 7/20436: {Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing}
- H10W 40/228: {the projecting parts being wire-shaped or pin-shaped}
- H10W 40/251: {Organics}
- H10W 40/735: {by melting or evaporation of solids}
- F28D 2020/0004: {Particular heat storage apparatus}
- F28D 2021/0028: {for cooling heat generating elements, e.g. for cooling electronic components or electric devices}
- F28D 2021/0029: {Heat sinks}
- F28F 2215/04: Assemblies of fins having different features, e.g. with different fin densities
- F28F 2215/06: Hollow fins; fins with internal circuits
- F28F 2275/04: by brazing
- Y02E 60/14: Thermal energy storage
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A pin fin heat sink includes a plurality of pin fins extending from a base plate, at least one of the plurality of pin fins defining a hollow portion therein. The heat sink also includes a phase change material sealed within the at least one pin fin to absorb transient thermal loads that the pin fin is subjected to.

## Claims

### Claim 1

A pin fin heat sink comprising:
a plurality of pin fins extending from a base plate, at least one of the plurality of pin fins defining a hollow portion therein, wherein all of the pin fins have different diameters relative to each other and at least one of the pin fins has a length different from one of the other fin pins;
a phase change material sealed within the at least one pin fin to absorb transient thermal loads that the pin fin is subjected to; and
a metal foam material disposed within the hollow portion, the metal foam material positioned along a central portion of the hollow portion to define an annular space between the metal foam material and an inner wall of the pin fin.

### Claim 2 (depends on 1)

The pin fin heat sink of claim 1, wherein the phase change material comprises paraffin wax.

### Claim 3 (depends on 1)

The pin fin heat sink of claim 1, wherein the pin fins are brazed to the base plate.

### Claim 4 (depends on 1)

The pin fin heat sink of claim 1, wherein the pin fins are additively manufactured to be connected, and extend from, the base plate.