Battery Pack Frame Venting Holes for Spark Containment
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Solution Overview
Problem
The challenge is to suppress flame generation in secondary batteries, particularly in mobility applications like battery electric vehicles, by preventing the discharge of spark particles generated by short circuits within the battery pack.
Innovation Solution
A battery assembly with a frame that includes venting holes, each with a width of 0.01 mm or more and less than 0.61 mm, to contain spark particles and prevent them from escaping, thereby eliminating the ignition source for flames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If venting holes are provided to exhaust gas from the battery cell block, then gas exhaust function is improved, but spark particles may escape through the holes causing flame generation
Solution Approach 1:
The patent applies local quality by creating venting holes with specific size characteristics (0.01 mm or more and less than 0.61 mm in width) that differ from conventional holes. This localized dimensional specification allows the holes to perform dual functions: permitting gas molecules to pass through while blocking larger spark particles, thus resolving the contradiction between gas exhaust and spark containment
Solution Approach 2:
The frame structure with multiple venting holes of controlled dimensions functions as a porous barrier. The specific hole size range creates a filtration effect where the porous structure allows gas flow while preventing the passage of spark particles, enabling simultaneous gas exhaust and spark containment
2Reliability
If the frame completely covers the cell block to prevent spark escape, then safety is improved, but gas exhaust capability deteriorates
Solution Approach 1:
Rather than making the entire frame impermeable, the patent applies local quality by introducing venting holes with specific size characteristics (0.01 mm or more and less than 0.61 mm) at strategic locations. This localized hole configuration provides controlled gas exhaust pathways while the overall frame structure maintains spark containment, resolving the contradiction between complete coverage and gas exhaust
Data Source
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AI summary
A battery assembly includes a cell block including a plurality of battery cells, and a frame covering at least one surface of the cell block. The frame includes a plurality of venting holes that exhausts gas, and each of the plurality of venting holes has a width of about 0.01 mm or more and less than 0.61 m.