Battery Module Venting Structure With Flame-Suppressing Sheet
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Solution Overview
Problem
Existing battery modules face issues with decreased rigidity due to venting holes, foreign substance ingress, and rapid flame spread during ignition, compromising safety and structural integrity.
Innovation Solution
A battery module design featuring a housing with a pattern structure of repetitive holes, preferably triangular, and an extinguishing sheet between the pattern structure and the cell stack, which maintains rigidity while effectively venting gases and suppressing flame spread using inorganic extinguishing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If venting holes are applied to discharge heat and flames quickly, then safety is improved, but rigidity of the battery module is decreased
Solution Approach 1:
The housing surface is segmented into multiple small venting holes arranged in a pattern structure rather than a single large opening. This segmentation allows effective heat and flame discharge while maintaining structural rigidity through the distributed hole configuration
Solution Approach 2:
An extinguishing sheet composed of inorganic extinguishing agents is integrated with the housing structure. This composite material approach combines the structural function of the housing with the fire suppression function of the extinguishing sheet, achieving both safety and rigidity
2Reliability
If venting holes are applied to discharge heat and flames quickly, then safety is improved, but foreign substances flow into the venting hole
Solution Approach 1:
The extinguishing sheet acts as an intermediary layer between the external environment and the battery cell stack. It allows heat and flames to pass through while blocking foreign substances from entering through the venting holes
Solution Approach 2:
The extinguishing sheet provides localized protection at the venting hole areas with different properties (permeable to heat/flames but impermeable to foreign substances), achieving selective filtration functionality
3Productivity
If the battery module is designed to be lightweight and thin, then productivity and integration are improved, but protection from outside shock, heat, or vibration is decreased
Solution Approach 1:
The extinguishing sheet integrates multiple functions (fire suppression, shock absorption, vibration damping) into a single lightweight component, providing enhanced protection without significantly increasing weight or thickness
Solution Approach 2:
The inorganic extinguishing agents in the extinguishing sheet undergo parameter changes (phase transitions, chemical reactions) when exposed to heat, enabling the thin structure to respond dynamically to thermal threats and maintain protection capability
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 design ensures effective discharge of heat and flames, prevents foreign substance ingress, and slows down flame spread, enhancing safety and maintaining structural integrity of the battery module.
Implementation Method 1
an extinguishing sheet disposed between the pattern structure and the battery cell stack... suppressing flame spread using inorganic extinguishing agents
Implementation Method 2
a pattern structure in which holes are formed in a repetitive shape... effectively venting gases
Implementation Method 3
holes are formed in a repetitive shape in at least one surface... discharge of heat and flames
Data Source
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AI summary
A battery module including: a battery cell stack including one or more battery cells; a housing for the battery cell stack; and an extinguishing sheet. The housing includes a pattern structure in which holes are formed in a repetitive shape in at least one surface of the housing, and the extinguishing sheet is disposed between the pattern structure and the battery cell stack.