Dual-Layer Battery Assembly Cover for Flame Blocking and Gas Venting
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Solution Overview
Problem
Existing battery systems face challenges in preventing flame propagation between adjacent battery cells and to the outside when one cell deteriorates, with a need for effective gas venting to minimize fire spread and ensure stability.
Innovation Solution
A battery assembly cover with an inner covering portion featuring venting holes and blocking portions, coupled with an outer covering portion, to prevent flame propagation and guide gas safely through venting channels, reducing direct exposure and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single covering structure is used to enclose battery cells, then the structure is simple and easy to manufacture, but it cannot effectively prevent flame propagation between adjacent cells while allowing gas venting
Solution Approach 1:
The cover structure is divided into an inner cover and an outer cover as separate components. The inner cover includes flame blocking portions that extend into the interior space to prevent flame propagation between adjacent battery cells, while the outer cover provides additional protection and structural support. This segmentation allows each component to perform its specific function effectively while maintaining overall structural integrity.
Solution Approach 2:
The flame blocking portions act as intermediary structures that extend from the inner cover into the interior space between battery cells. These blocking portions serve as a physical barrier that intercepts and blocks flame propagation paths while still allowing the cover structure to maintain its enclosing function. The intermediary blocking portions resolve the contradiction by providing flame protection without requiring complete structural redesign.
2Object-generated harmful factors
If venting holes are provided in the cover to allow gas escape, then gas can be vented smoothly, but flame can propagate through the holes to adjacent cells or outside
Solution Approach 1:
The flame blocking portions are strategically positioned in specific locations where flame propagation is most likely to occur between adjacent battery cells. Rather than providing uniform protection throughout the entire cover structure, the blocking portions are placed locally at critical interfaces between cells, allowing gas to vent through other areas while preventing flame spread at vulnerable points.
Solution Approach 2:
The venting function and flame blocking function are separated into different structural elements. The inner cover provides flame blocking through its blocking portions, while the outer cover and associated venting structures provide gas escape pathways. This functional segmentation allows gas to vent smoothly while flame propagation is prevented by the inner cover's blocking portions.
Data Source
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AI summary
Disclosed herein are a battery assembly cover including: an inner covering portion covering a battery assembly and having a plurality of venting holes; an outer covering portion covering the inner covering portion from an outside, separated from the inner covering portion, and defining a venting space with the inner covering portion; and a plurality of outer blocking portions in the venting space and between adjacent venting holes dividing the venting space into a plurality of spaces, a battery pack, and a vehicle.