Cylindrical Battery Core Support for Controlled Gas Venting
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Solution Overview
Problem
The core collapse phenomenon in electrode assemblies of secondary batteries due to repeated expansion and contraction during charging and discharging leads to increased risk of short circuits and safety hazards such as chain ignition or explosion.
Innovation Solution
A battery design featuring a core support with a hollow structure and rupture portions to enhance rigidity, guiding gas discharge through a venting portion, and a reinforcement member to prevent side rupture, along with a current collector to facilitate smooth pressure dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a jellyroll-type electrode assembly with a central winding hole is used in a cylindrical battery, then the battery structure is simple and manufacturing is easy, but the core collapses during repeated charging and discharging causing safety hazards
Solution Approach 1:
A core support structure is pre-installed in the central winding hole before the electrode assembly is wound and sealed. This preliminary structural reinforcement prevents core collapse during subsequent charging-discharging cycles, eliminating the safety hazard while maintaining the simple cylindrical battery structure and manufacturing process
2Reliability
If the internal pressure of the battery housing increases during use, then gas must be vented to prevent explosion, but uncontrolled pressure dissipation can cause side rupture and chain ignition
Solution Approach 1:
The battery housing is designed with a localized venting portion at the top cover, while the side walls maintain high strength. This creates different functional zones: the venting area handles pressure release, and the reinforced sides prevent rupture. The core support also guides gas flow toward the venting portion, ensuring controlled pressure dissipation that prevents chain ignition while safely relieving internal pressure
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
Prevents core deformation and minimizes side pressure transfer, thereby preventing chain ignition or explosion by ensuring controlled pressure dissipation and maintaining battery safety.
Implementation Method 1
a venting portion configured to be ruptured when an internal pressure of the battery housing exceeds a reference venting pressure
Implementation Method 2
configured to guide a discharge direction of gas generated inside the electrode assembly toward the venting portion
Data Source
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AI summary
A battery according to an embodiment of the present disclosure may include: an electrode assembly having a winding structure around a central winding hole; a battery housing configured to receive the electrode assembly through an opening provided on one side; a battery cover configured to cover the opening of the battery housing and having a venting portion configured to be ruptured when an internal pressure of the battery housing exceeds a reference venting pressure; and a core support configured to be inserted into the central winding hole of the electrode assembly so as to increase rigidity of a core of the electrode assembly, and configured to guide a discharge direction of gas generated inside the electrode assembly toward the venting portion.