Compartmentalized Battery Pack Venting for Pressure Relief Isolation
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Solution Overview
Problem
Existing traction battery packs for electrified vehicles lack an efficient mechanism to communicate vent byproducts from battery cells outside the pack, potentially leading to safety issues and reduced performance.
Innovation Solution
A battery pack venting system is designed with a cell stack configuration where groups of battery cells are housed in compartments within an enclosure. Each compartment has a one-way compartment vent that opens in response to pressure increases, allowing vent byproducts to be directed through the intermediate cover assembly and then through an enclosure vent to an area outside the battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If battery cells are housed in sealed compartments without vents, then containment and structural integrity are improved, but pressure buildup from vent byproducts creates safety hazards
Solution Approach 1:
The battery pack is divided into multiple sealed compartments, each containing groups of battery cells. Each compartment has its own one-way vent, allowing pressure relief while maintaining containment. This segmentation enables localized pressure management without compromising overall pack integrity.
Solution Approach 2:
One-way vents serve as intermediary components between the sealed compartment interior and the intermediate cover assembly. These vents allow pressure equalization by permitting gas flow in one direction while maintaining the sealed containment structure, thus resolving the contradiction between containment and pressure relief.
2Ease of operation
If vent byproducts are released directly to the outside environment, then pressure relief is improved, but thermal events can cascade to other cells
Solution Approach 1:
Compartments are separated by partition walls that act as thermal barriers. When a battery cell experiences thermal runaway, the compartment structure contains the thermal event within that specific compartment, preventing propagation to adjacent cells. This segmentation enables safe pressure relief while maintaining thermal isolation.
Solution Approach 2:
The intermediate cover assembly serves as an intermediary chamber between the sealed compartments and the external environment. Vent byproducts are first released into this intermediate space, which acts as a buffer zone, before being vented outside. This intermediary structure prevents direct thermal contact between compartments while maintaining pressure relief functionality.
3Productivity
If one-way compartment vents are used, then venting capability is improved, but byproducts may accumulate in the intermediate cover area
Solution Approach 1:
Multiple compartment vents converge into a common intermediate cover assembly that provides a shared venting pathway to the outside environment. This merging of venting paths allows efficient accumulation and directed release of byproducts from multiple compartments through a unified exit, preventing localized accumulation while maintaining high venting speed.
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 system effectively communicates vent byproducts from battery cells to the outside, enhancing safety by preventing pressure buildup and reducing the risk of thermal events cascading to other cells.
Implementation Method 1
the at least one compartment vent is configured to open in response to a pressure increase within the compartment associated with that at least one compartment vent
Data Source
AI summary
A battery pack venting system is disclosed, comprising a battery pack enclosure with an interior housing a cell stack consisting of multiple battery cells arranged along a stack axis and segregated into groups within compartments. An intermediate cover assembly encloses the groups within the compartments and includes compartment vents for each compartment. The compartments vent through the compartment vents to an area between the intermediate cover and the battery pack enclosure.