Battery Cell Venting System with Segmented Flow Pathways
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Solution Overview
Problem
Electrified vehicle battery packs face challenges in effectively venting gaseous byproducts, such as during thermal runaway events, which can lead to pressure buildup and potential damage, due to existing venting systems being prone to blockage and inadequate flow pathways.
Innovation Solution
The proposed solution involves a venting system comprising a vent port, vent tubes, and a spacer plate within the battery cell, which establish multiple flow pathways to facilitate the escape of gaseous byproducts, with vent tubes secured inside the casing and a spacer plate mounted between the vent port and the electrode assembly to prevent blockage and ensure unobstructed flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple vent port is used in existing battery cells, then the device complexity is reduced, but the venting system becomes prone to blockage and inadequate flow pathways
Solution Approach 1:
The venting system is segmented into multiple independent flow pathways including a vent tube extending from the vent port toward the electrode assembly, and multiple spacers creating additional pathways. This segmentation ensures that if one pathway becomes blocked, other pathways remain functional, thereby improving reliability without significantly increasing overall device complexity.
Solution Approach 2:
Spacers are introduced as intermediary elements between the vent port and the electrode assembly. These spacers create controlled flow pathways and prevent direct contact between the vent tube and electrode assembly, reducing the risk of blockage while maintaining a relatively simple overall structure.
2Reliability
If multiple flow pathways are established using vent tubes and spacer plates, then the venting effectiveness and reliability are improved, but the device complexity increases
Solution Approach 1:
The venting system divides the flow pathways into multiple segmented channels created by the vent tube and spacers. This segmentation provides redundant routes for gas flow, improving reliability while keeping each individual component relatively simple in structure.
Solution Approach 2:
The vent tube extends in a dimension parallel to the electrode assembly rather than directly through it, creating a three-dimensional flow pathway network. This dimensional approach allows multiple flow paths without requiring complex multi-layer structures, balancing reliability improvement with structural simplicity.
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 described venting system effectively communicates gaseous byproducts, mitigating pressure buildup and preventing vent port blockage, thereby enhancing the safety and reliability of battery cells during thermal events.
Implementation Method 1
a vent tube inside the can assembly... the vent tube establishes a flow pathway between different portions of the can assembly
Implementation Method 2
a spacer plate mounted between the vent port and the electrode assembly... the spacer plate is configured to establish a second flow pathway for communicating the gaseous byproducts
Data Source
AI summary
A battery cell may include, among other things, a can assembly, an electrode assembly housed inside the can assembly, and a venting system including a vent port and at least one of a vent tube inside the can assembly or a spacer plate mounted between the vent port and the electrode assembly.