Battery Pack Heat Radiating Member for Low Thermal Resistance
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Solution Overview
Problem
Battery packs face challenges in efficiently transferring heat energy due to high thermal contact resistance, which can lead to safety issues during ignition in battery modules, particularly in large-sized devices like electric vehicles.
Innovation Solution
A battery pack design incorporating a heat radiating member with a recessed part and a compressible cooling pad, formed from silicone or acrylic materials, that makes close contact with the pack case through fastening parts, minimizing thermal contact resistance and enabling rapid heat energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heat radiating member is added to transfer heat energy, then heat transfer efficiency is improved, but device complexity increases
Solution Approach 1:
The heat radiating member is integrated with the existing pack case structure, merging the heat transfer function into the housing rather than adding a completely separate system. This reduces overall device complexity while maintaining effective heat transfer capability.
Solution Approach 2:
The heat radiating member acts as an intermediary component between the battery modules and the external environment, facilitating heat transfer through a dedicated thermal pathway. This mediator approach improves heat transfer efficiency without requiring complete system redesign.
2Loss of energy
If contact between heat radiating member and pack case is increased to reduce thermal contact resistance, then heat transfer is improved, but manufacturing precision requirements increase
Solution Approach 1:
The heat radiating member incorporates a flexible cooling pad that can deform to conform to the pack case surface, ensuring intimate contact without requiring extremely precise manufacturing tolerances. This flexibility compensates for minor surface irregularities.
Solution Approach 2:
The design changes the physical state of the contact interface by using a compressible cooling pad that transitions from a relaxed to a compressed state during assembly. This parameter change (compression) improves contact quality and reduces thermal resistance without demanding higher manufacturing precision.
3Reliability
If fastening parts are used to secure the heat radiating member, then reliability is improved, but device complexity increases
Solution Approach 1:
The fastening mechanism is merged with the existing battery module assembly process, using the same fastening infrastructure already present in the pack case. This approach improves reliability of the heat transfer connection without significantly increasing overall assembly complexity.
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
The design enhances heat energy transfer efficiency and improves safety by allowing for quick discharge of heat energy during ignition, reducing the risk of thermal runaway in battery packs.
Implementation Method 1
a battery pack that minimizes thermal contact resistance... heat radiating member formed so as to make contact with the upper case... minimizing thermal contact resistance and enabling rapid heat energy transfer
Data Source
AI summary
A battery pack includes a plurality of battery modules; and a pack case for housing the plurality of battery modules, wherein the pack case includes an upper case. The battery pack further includes a heat radiating member formed so as to make contact with the upper case.