Battery Beading Protection Structure for Thermal Gas Discharge
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Solution Overview
Problem
The beading portion of battery housings is structurally weak and prone to deformation, damage, and pin hole formation due to flame and gas during thermal events, compromising the durability and stability of the battery.
Innovation Solution
A heat-resistant protection member is interposed between the beading portion and the electrode assembly, preventing deformation and damage by guiding gas and flame away from the beading portion and ensuring unobstructed discharge through a donut-shaped first protection member and an upwardly extending second protection member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the battery housing is reduced to maximize internal space and energy density, then the energy density is improved, but the durability and structural strength of the battery housing deteriorates
Solution Approach 1:
The protection member is divided into a first protection member (ring shape) and a second protection member (upwardly extending from the first), creating segmented protective structures that reinforce different areas of the beading portion independently, allowing the housing to remain thin while maintaining strength through distributed protection
2Stability of the object's composition
If the beading portion is press-fitted to secure the electrode assembly, then the structural stability is improved, but the local area becomes thinner and more vulnerable to damage
Solution Approach 1:
The protection member acts as an intermediary component inserted between the electrode assembly and the beading portion, providing additional structural support to the thinned areas created by press-fitting, and serving as a barrier that prevents flame and gas from directly damaging the already weakened beading portion
3Object-generated harmful factors
If the first protection member is designed with a center hole to allow flame and gas discharge, then the discharge passage is maintained, but the protective coverage area is reduced
Solution Approach 1:
The protection system is segmented into the first protection member (ring shape with center hole) that allows central discharge passage while providing circumferential protection, and the second protection member (upwardly extending) that provides additional protection at the beading portion, creating multiple zones of protection rather than a single continuous barrier
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 protection members enhance the structural integrity of the beading portion, preventing pin hole formation and ensuring stable discharge of gas and flame, thereby improving the overall battery stability.
Implementation Method 1
a first protection member interposed between the beading portion and the electrode assembly... The first protection member may contain a heat-resistant material... preventing deformation and damage by guiding gas and flame away from the beading portion
Data Source
AI summary
A battery has a protection member applied between an electrode assembly and a beading portion. The battery includes an electrode assembly; a battery housing having an opening formed on one side to accommodate the electrode assembly through the opening and including a beading portion formed by press-fitting the perimeter of an outer circumference at the opening; a top cap configured to cover the opening; and a first protection member interposed between the beading portion and the electrode assembly.