Secondary Battery Vent Insulation for Flame Blocking and Venting
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Solution Overview
Problem
Secondary batteries face the risk of damage and thermal runaway due to heat accumulation and potential flames from vent discharge, which existing designs fail to adequately mitigate.
Innovation Solution
A heat insulation member made of insulating materials like MICA, attached to the case covering the vent, with a stitch pattern that allows vent operation while preventing damage from discharge materials, ensuring safety and reducing thermal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent is provided on the case to discharge internal pressure, then the reliability of the battery is improved, but the risk of flame and heat damage to surrounding components increases
Solution Approach 1:
A heat insulation member is introduced as an intermediary component between the vent and the case. This member covers the vent opening and blocks the direct path of flames and hot discharge materials to the case and surrounding components, while still allowing the vent to perform its pressure relief function. The heat insulation member acts as a protective barrier that mediates between the vent's discharge function and the case's structural integrity.
Solution Approach 2:
The heat insulation member is pre-installed on the case before the vent operates. This preliminary protective measure ensures that when the vent discharges internal pressure during abnormal conditions, the flames and hot materials are immediately blocked by the insulating layer, preventing thermal damage before it can propagate to the case and surrounding components.
2Object-affected harmful factors
If the vent area is completely sealed to prevent heat damage, then the safety from flame propagation is improved, but the pressure relief function of the vent is lost
Solution Approach 1:
The heat insulation member is designed with local quality variations through the stitch pattern. The stitching creates regions with different thermal and mechanical properties - the stitched areas provide structural attachment and localized heat blocking, while the unstitched regions allow for controlled discharge. This local differentiation enables the insulating member to simultaneously protect against flame propagation and maintain pressure relief functionality.
Solution Approach 2:
The heat insulation member incorporates a stitch pattern that creates a porous or semi-permeable structure. This stitch pattern allows gases and pressure to pass through while the material itself blocks direct flame propagation. The porous structure formed by the stitching enables the insulating member to function as both a protective barrier and a pressure relief pathway.
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 solution effectively protects the secondary battery from flames and heat by insulating the vent area, reducing the risk of damage and thermal propagation, thus enhancing safety and longevity.
Implementation Method 1
a heat insulation member coupled to a surface of the case, and covering a region corresponding to the vent
Data Source
AI summary
The present disclosure provides a secondary battery in which a heat insulation member is attached onto a vent to protect a cell from flames. The secondary battery includes a case having the vent on one side, an electrode assembly in the case, a pair of terminals coupled to respective sides of the case, and electrically connected to the electrode assembly, and the heat insulation member coupled to a surface of the case, and covering a region corresponding to the vent.