Battery Housing Vent Channels for Thermal Runaway Containment
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Solution Overview
Problem
Lithium-ion batteries face challenges with thermal runaway propagation due to the directional expulsion of ejecta from failing cells, which can lead to battery fires and deflagration.
Innovation Solution
A battery housing design featuring a primary vent channel and isolated auxiliary vent channels, where each cell receptacle is aligned with the primary vent channel for directional expulsion of substances and includes auxiliary vent channels for gases to escape even if the primary channel is blocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single primary vent channel is used for each cell, then the directional venting function is simple and reliable, but the vent channel may be blocked by solid matter in the ejecta, preventing complete gas expulsion
Solution Approach 1:
The patent combines multiple vent channels (primary and auxiliary) into a unified venting system for each cell receptacle. The primary vent channel handles main gas expulsion while auxiliary vent channels provide alternative pathways, merging their functions to ensure comprehensive venting coverage and prevent complete blockage.
Solution Approach 2:
The patent applies different characteristics to different vent channels: the primary vent channel is positioned to receive ejecta directly and handle bulk expulsion, while auxiliary vent channels are positioned at different locations and orientations to provide alternative pathways. This local differentiation ensures that if one channel is blocked, others remain functional.
2Quantity of substance
If auxiliary vent channels are positioned to intersect with the vent direction, then they can capture more gases, but they will also be clogged by solid matter in the ejecta
Solution Approach 1:
The auxiliary vent channels are positioned asymmetrically relative to the primary vent channel and the cell vent direction. They are oriented at angles that allow them to capture gases that escape from the primary channel without being directly in the path of solid ejecta. This asymmetric positioning creates a geometric relationship where gas flow paths and solid particle paths are separated.
Solution Approach 2:
The auxiliary vent channels act as intermediary pathways that capture gases indirectly. Instead of being directly in the main ejecta stream, they provide secondary escape routes that gases can access after being expelled from the primary channel, while solids are directed away from these auxiliary openings by the geometric arrangement.
3Device complexity
If vent channels are shared among multiple cells, then the housing structure is simplified, but a blockage in one cell's vent channel can affect other cells
Solution Approach 1:
The patent segments the venting system into cell-specific primary and auxiliary vent channels for each cell receptacle. While the overall housing structure remains integrated, each cell has its own dedicated vent channel openings and pathways, ensuring that venting operations are independent for each cell. This segmentation prevents cross-contamination of blockages between cells.
Solution Approach 2:
The patent uses spatial separation in three-dimensional space to resolve the conflict between shared structure and independent function. By positioning vent channel openings at different locations and orientations for each cell, and by creating auxiliary channels that extend in different dimensional directions, the design achieves both structural integration and functional independence.
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
This design effectively directs ejecta away from other cells, preventing thermal runaway propagation and reducing the risk of battery failure by ensuring gases can still escape through auxiliary channels even if the primary vent is blocked.
Implementation Method 1
internal substances expelled from the vent valve or a rupture at the vent valve in an associated vent direction are directed into the primary vent channel
Data Source
AI summary
A battery housing may include a primary vent channel, auxiliary vent channels, and receptacles for receiving cells. Each receptacle may have sidewalls that operate as barriers to cell venting events occurring in other receptacles, an auxiliary vent channel opening to a respective auxiliary vent channel, and a primary vent channel opening to the primary vent channel. Each primary vent channel opening may be aligned with a position of a vent valve of a cell disposed within a respective receptacle such that internal substances expelled from the vent valve or a rupture at the vent valve in an associated vent direction are directed into the primary vent channel. Each auxiliary vent channel opening is not aligned with a respective primary vent channel opening and a respective position of a vent valve.