Overmolded DIMM Cooling Structure for Thermal Management

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Solution Overview

Problem

Existing dual in-line memory module (DIMM) cooling systems are difficult for users to install and replace due to the need for thermal interface material and metal spreader plates, which complicate heat transfer and increase thermal impedance.

Innovation Solution

An overmolded DIMM cooling structure using injectable/castable thermal material that encapsulates the DIMM, eliminating the need for thermal interface material and metal spreader plates, and incorporating a conductive plate for improved thermal conductivity, allowing for efficient heat transfer to liquid cooled pipes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thermal interface material and heat spreaders/latches are used to couple DIMMs to cooling pipes, then heat transfer is achieved, but installation and removal become difficult and device complexity increases

Engineering Contradiction:
Improveheat transfer efficiencyVSAvoidinstallation and removal ease
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent combines the thermal interface material, heat spreader, and retention latches into a single integrated overmolded assembly. The DIMM is permanently encapsulated with thermal material that directly contacts the cooling pipe, eliminating the need for separate thermal interface materials and heat spreaders. The retention latches are integrated into the molding, creating a unified structure that simplifies both installation and removal operations.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The overmolded assembly serves multiple functions simultaneously: it provides thermal conduction from the DIMM to the cooling pipe, structural support for the DIMM, retention through integrated latches, and accommodation of dimensional variations. This multi-functional design eliminates the need for multiple separate components, reducing complexity while maintaining effective heat transfer.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Reliability

If rigid thermal interface materials and heat spreaders are used, then thermal contact is established, but accommodation of DIMM thickness and dimensional variations is poor

Engineering Contradiction:
Improvethermal contact qualityVSAvoidaccommodation of dimensional variations
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses compliant thermal material with adjustable physical properties, specifically材料的柔软性和可压缩性, to adapt to different DIMM thicknesses and dimensional variations. The thermal material's compliance allows it to deform and maintain consistent thermal contact across varying DIMM dimensions, achieving reliable heat transfer without requiring precise dimensional matching.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The overmolded assembly uses composite construction combining the DIMM, compliant thermal material, and structural molding elements. This composite structure allows the thermal material to conform to dimensional variations while the outer molding provides structural integrity and retention, simultaneously achieving both thermal contact quality and adaptability to dimensional variations.

Inventive Principle:
Principle #40Composite materials

3Reliability

If multiple separate components (thermal interface material, heat spreaders, latches) are used, then thermal conduction is achieved, but the number of parts increases and manufacturing complexity increases

Engineering Contradiction:
Improvethermal conductionVSAvoidnumber of parts
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple separate components into a single overmolded assembly. The thermal interface material, heat spreader, and retention latches are all integrated into one unified structure through overmolding, reducing the part count from multiple separate components to a single integrated unit while maintaining all necessary thermal conduction functions.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The single overmolded assembly performs multiple functions that previously required separate components: thermal conduction, structural support, retention, and accommodation of dimensional variations. This multi-functional design reduces device complexity by eliminating the need for multiple separate parts while maintaining all necessary functions.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables easy user installation and replacement of DIMMs, reduces thermal impedance, and maintains consistent thermal performance across varying DIMM thicknesses and dimensions, while improving thermal conductivity and simplifying the cooling process.

Implementation Method 1

The thermal material (104) is part of a thermal interface (107) that is used for transferring heat from the DIMM (102) to a cooling manifold (130)

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

The thermal material (104) is compliant enough so that it will compress when installed against a cold cooling manifold (130)

Methodology Applied
Scientific EffectCompression: Compression

Data Source

PatentUS9943936B2Overmolded dual in-line memory module cooling structure
Publication Date: 2018.04.17 LENOVO GLOBAL TECHNOLOGIES SWITZERLAND INTERNATIONAL GMBH
  • US9943936B2 patent drawing
  • US9943936B2 patent drawing
  • US9943936B2 patent drawing

AI summary

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