Cylindrical Battery Can Groove for Built-In Fire Suppression
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Solution Overview
Problem
Cylindrical secondary batteries are prone to ignition and lack effective means to extinguish or prevent the spread of fire.
Innovation Solution
Incorporation of a fire extinguishing agent within the battery can, sealed by a recessed groove and sealing part, which is ejected upon ignition to extinguish the fire and prevent its spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical battery structure is used, then the battery can achieve compact size and high capacity, but the battery has a risk of ignition and lacks fire extinguishing capability
Solution Approach 1:
The extinguishing agent container is nested within the battery can structure, utilizing the existing internal space. The beading part forms a recessed groove that houses the extinguishing agent, creating a nested configuration where the fire suppression system is integrated inside the battery can without requiring external components or significantly increasing overall battery dimensions.
Solution Approach 2:
The extinguishing agent is pre-positioned in the beading part recessed groove before any fire event occurs. The sealing part is pre-installed to maintain the integrity of the extinguishing agent storage area. When ignition occurs, the system is already prepared with the extinguishing agent in place, eliminating the need for real-time deployment decisions or complex activation mechanisms.
2Reliability
If the extinguishing agent is stored in the beading part, then the fire can be extinguished, but the sealing part is required to prevent premature release
Solution Approach 1:
The sealing part is merged with the cap assembly structure, combining the sealing function with the existing closure mechanism of the battery. The sealing part is positioned at the lower end of the cap assembly and works in conjunction with the beading part to create a sealed environment for the extinguishing agent, eliminating the need for a separate standalone sealing component.
Solution Approach 2:
The beading part structure itself provides the sealing interface through its recessed groove configuration. The sealing part simply needs to mate with this pre-formed geometry, allowing the structural features of the beading part to contribute to the sealing function without requiring additional complex sealing mechanisms or components.
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
Effectively extinguishes fires and prevents their spread by using a compressed extinguishing agent, such as Halon gas, nitrogen, or carbon dioxide, when the battery is ignited.
Implementation Method 1
the extinguishing agent may be provided as the compressed extinguishing agent, which is ejected when the secondary battery is ignited
Data Source
AI summary
A secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked to be wound, a can configured to accommodate the electrode assembly therein, having an opening in an upper end thereof, and provided with a beading part that is bent inward to form a recessed groove, a cap assembly seated on the beading part to cover the opening of the can, an extinguishing agent accommodated in the recessed groove to extinguish ignition when the secondary battery is ignited, and a sealing part configured to seal the recessed groove.