# US 2018/0320993 A1 · Liquid cold plate heat exchanger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320993 A1 - Document ID: US20180320993A1 - Status: Published application - Kind: A1 - Application number: 15/972,592 - Filed: 2018-05-07 - Published: 2018-11-08 - Earliest claimed: 2017-05-08 - Assignees: Aavid Shenzen Thermal Energy System Co. Ltd. - Applicants: Aavid Shenzen Thermal Energy System Co. Ltd. - Inventors: Sonawane Parag; Bert Feng - Web page: https://patentgrep.com/patent/US20180320993A1 ## CPC - F28F 9/005: {Other auxiliary members within casings, e.g. internal filling means or sealing means} - F28F 3/02: Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations (F28F3/08 takes precedence) - F28F 3/12: Elements constructed in the shape of a hollow panel, e.g. with channels {(F28D1/02, F28D1/03 take precedence)} - H05K 7/20254: {Cold plates transferring heat from heat source to coolant} - H10W 40/037: {Assembling together parts thereof} - H10W 40/47: by flowing liquids, e.g. forced water cooling - H10W 40/60: Securing means for detachable heating or cooling arrangements, e.g. clamps - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A liquid cold plate heat exchanger includes a heat sink with a plurality of fins received in a cavity between a base plate and a cap. A spring plate may be positioned between a top surface of the heat sink, e.g., over fins of the heat sink, and a lower surface of the cap in the cavity. The spring plate may at least partially and/or completely fill a gap between the heat sink and the cap, aiding in thermal conduction between the cap and heat sink. ## Claims ### Claim 1 A liquid cold plate heat exchanger, comprising: a base having an upper surface; a heat sink having a plurality of fins arranged on the upper surface of the base, the plurality of fins defining a top surface of the heat sink; a cap having a lower surface positioned over the upper surface of the base and the heat sink; and a spring plate positioned between the top surface of the heat sink and the lower surface of the cap, wherein with the cap secured to the base, the spring plate is arranged to exert an upward bias on the lower surface of the cap and a downward bias on the top surface of the heat sink. ### Claim 2 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the base, heat sink, cap and spring plate are arranged to withstand a temperature of 500 degrees C. for at least 1 hour. ### Claim 3 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the base, heat sink, cap and spring plate are arranged to withstand a temperatures required to secure the lower surface of the cap to the upper surface of the base by vacuum brazing. ### Claim 4 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the base and heat sink are made of copper or aluminum. ### Claim 5 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the spring plate includes a heat sink contacting portion that contacts the heat sink top surface and a cap contacting portion that contacts the lower surface of the cap, and the heat sink contacting portion is located below the cap contacting portion. ### Claim 6 (depends on 5) The liquid cold plate heat exchanger of claim 5, wherein the heat sink contacting portion is between first and second cap contacting portions located at opposite ends of the spring plate. ### Claim 7 (depends on 7) The liquid cold plate heat exchanger of claim 7, wherein the spring plate is formed of a bent metal sheet that forms the heat sink contacting portion and the first and second cap contacting portions, and wherein the heat sink contacting portion is located in a lower plane positioned below an upper plane in which the first and second cap contacting portions are located. ### Claim 8 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the spring plate is formed of a metal sheet having a thickness of 0.1 to 0.2 mm. ### Claim 9 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the spring plate is formed from a stainless steel metal sheet. ### Claim 10 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the spring plate is formed by stamping a metal sheet material, and where in the stamped spring plate is elastic. ### Claim 11 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the plurality of fins includes fins having a space of 0.1 to 0.2 mm between adjacent fins. ### Claim 12 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the top cap is formed of copper or aluminum. ### Claim 13 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein a portion of the upper surface of the base and a portion of the lower surface of the cap are secured together by vacuum brazing. ### Claim 14 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein a portion of the upper surface of the base and a portion of the lower surface of the cap are secured together to form a liquid-tight seal around the heat sink. ### Claim 15 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein the cap includes a cavity in a portion of the lower surface arranged to receive and contact the spring plate and to receive at least a portion of the heat sink. ### Claim 16 (depends on 15) The liquid cold plate heat exchanger of claim 15, wherein the spring plate includes an upper portion that contacts the cap in the cavity, and includes a lower portion that contacts the top surface of the heat sink. ### Claim 17 (depends on 1) The liquid cold plate heat exchanger of claim 1, wherein a distance between lower surface of the cap in the cavity and the top surface of the heat sink is between 0.1 mm and 0.2 mm. ### Claim 18 A liquid cold plate heat exchanger, comprising: a base having an upper surface; a heat sink having a plurality of fins arranged on the upper surface of the base, the plurality of fins defining a top surface of the heat sink; a cap having a lower surface and a cavity formed in a portion of the lower surface, the cavity positioned over the upper surface of the base and the heat sink; and a spring plate positioned between the top surface of the heat sink and the lower surface of the cap at the cavity, wherein a portion of the lower surface of the cap around the cavity is secured to a portion of the upper surface of the base around the heat sink, and the spring plate is arranged to exert an upward bias on the lower surface of the cap at the cavity and a downward bias on the top surface of the heat sink. ### Claim 19 (depends on 18) The liquid cold plate heat exchanger of claim 18, wherein the portion of the upper surface of the base and the portion of the lower surface of the cap are secured together by vacuum brazing. ### Claim 20 (depends on 18) The liquid cold plate heat exchanger of claim 18, wherein the spring plate is deformed elastically and/or plastically with contact with the cap and heat sink.