Battery Package Venting Structure for Heat and Pressure Release
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Solution Overview
Problem
Secondary batteries face insufficient safety due to inadequate configuration, leading to potential risks during charging and discharging processes.
Innovation Solution
A secondary battery design featuring an outer package with a through hole, where the electrode terminal covers the hole and an insulating member is placed between the terminal and the package, with a temperature of deflection under load between 60°C and 150°C, ensuring the cover part is thinner than the container part, facilitating heat transfer and pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer package member is sealed completely without through holes, then safety is improved by preventing external contamination, but heat dissipation capability deteriorates leading to overheating risks
Solution Approach 1:
The outer package member is segmented into two functional parts: a sealed container part that prevents contamination and a separate cover part with through holes that enables heat dissipation. This segmentation allows the battery package to simultaneously achieve both protection and thermal management functions.
Solution Approach 2:
The insulating member acts as an intermediary component between the electrode terminal and the outer package member. It selectively covers certain through holes while leaving others open, thereby controlling and regulating heat dissipation pathways without compromising the protective function of the sealed package structure.
2Strength
If the cover part is made thicker to improve structural strength, then mechanical strength is improved, but heat transfer efficiency deteriorates
Solution Approach 1:
The outer package member exhibits local quality differentiation where the container part has greater thickness for structural strength and protection, while the cover part has smaller thickness to optimize heat transfer efficiency. This non-uniform thickness distribution allows each part to perform its specific function optimally.
3Reliability
If the insulating member covers the through hole completely, then electrical insulation is improved preventing short circuits, but heat dissipation capability deteriorates
Solution Approach 1:
The insulating member performs partial coverage of the through holes rather than complete coverage. This partial action is sufficient to provide the necessary electrical insulation for safety while leaving adequate openings to maintain effective heat dissipation pathways from the battery interior to the exterior.
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
This configuration enhances safety by allowing for effective heat dissipation and pressure release, preventing overheating and rupture, thus improving the overall safety of the battery.
Implementation Method 1
The insulating member has a temperature of deflection under load of greater than or equal to 60° C. and less than or equal to 150° C.
Implementation Method 2
the cover part has a thickness smaller than a thickness of the container part... facilitating heat transfer and pressure release
Data Source
AI summary
A secondary battery includes an outer package member, a battery device, an electrode terminal, and an insulating member. The outer package member has a through hole. The battery device is contained inside the outer package member. The electrode terminal is disposed on an outer side of the outer package member and covers the through hole. The insulating member is disposed between the electrode terminal and the outer package member, and does not cover the through hole. The outer package member includes a container part having an opening and containing the battery device inside, and a cover part having the through hole and closing the opening. The container part and the cover part are joined to each other. The insulating member has a temperature of deflection under load ranging from 60° C. to 150° C. both inclusive. The cover part has a thickness smaller than a thickness of the container part.