Corrugated Battery Module Lid for Cell Vent Gas Isolation
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Solution Overview
Problem
Current battery cell venting mechanisms are inadequate in efficiently releasing pressure without affecting neighboring cells during thermal runaway events, as they often fail to provide controlled gas flow and may allow reverse airflow.
Innovation Solution
An integrated pressure relief ventilation system using a corrugated battery module lid with crests and troughs, featuring thermal barrier materials and elongated slits that deform to direct gas emission channels, preventing gas from spreading to neighboring cells while ensuring controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional pressure valve is used to release gas pressure from battery cells, then the pressure can be released quickly, but the gas may spread to neighboring cells causing catastrophic failures
Solution Approach 1:
The battery module lid is segmented into multiple enclosures, each covering individual battery cells or groups of cells. Each enclosure has its own pressure release mechanism, creating isolated compartments that prevent gas from spreading between cells while maintaining rapid pressure release capability within each compartment.
Solution Approach 2:
The corrugated lid structure acts as an intermediary between the battery cells and the external environment. The crests and troughs of the corrugated structure create enclosed spaces that channel and direct gas flow, serving as a mediator that controls gas movement and prevents uncontrolled spread to neighboring cells.
2Stress or pressure
If the pressure release mechanism is opened to release gas, then gas pressure is reduced, but reverse airflow may occur affecting other cells
Solution Approach 1:
The pressure release mechanisms are designed to be dynamic rather than static. The elongated slits can deform and close automatically when pressure differential reverses, and the corrugated lid structure can dynamically adjust the enclosure volumes in response to pressure changes, preventing reverse airflow while maintaining pressure relief capability.
3Reliability
If thermal barrier materials are added to prevent gas spread, then safety is improved, but device complexity increases
Solution Approach 1:
The corrugated lid introduces curvature and three-dimensional structure to the battery module cover. The crests and troughs of the corrugated profile create natural enclosures and flow channels that provide thermal barriers and gas containment without requiring additional flat barrier materials, maintaining relative simplicity while improving safety.
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 system effectively manages gas pressure buildup by directing gas emissions away from neighboring cells, providing additional sealing pressure and preventing gas from spreading during thermal runaway events, thus enhancing safety and reducing the risk of catastrophic failures.
Implementation Method 1
the plurality of enclosures are arranged to accumulate a maximum amount of gas pressure from a gas emitted by one of the plurality of battery cells
Implementation Method 2
A plurality of strips, constructed of a thermal barrier material and covers the one or more pressure release mechanisms
Implementation Method 3
the released accumulated gas is directed through the one or more gas emission channels between the plurality of crests
Implementation Method 4
The one or more pressure release mechanisms are arranged to, in response to that the enclosure has accumulated a gas pressure exceeding the maximum amount of gas pressure, automatically release at least a part of the accumulated gas
Data Source
Figure 1~2A
Figure 2B~3
Figure 4A~4B
AI summary
Various embodiments disclosed herein relate to systems and methods for battery cell ventilation. A corrugated battery module lid may be integrated above a battery cell module, wherein the corrugated lid includes a plurality of crests and troughs to form one or more gas emission channels. The plurality of crests and troughs may be at least partially positioned to encompass at least one of the plurality of battery cells to form enclosures. The enclosures may accumulate a maximum amount of gas pressure from a gas emitted by the at least one of the plurality of battery cells. One or more pressure release mechanisms may be associated with the plurality of enclosures and integrated with the battery module lid. In response to the enclosure exceeding the maximum amount of gas pressure, the gas may be automatically released through the pressure release mechanisms and flow though the channels between the crests.