Traction Battery Vent Filter Assembly for Particulate Blocking
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Solution Overview
Problem
Existing battery cell venting systems in electrified vehicles fail to effectively filter particulates, which can lead to undesired electrical connections and potential hazards due to the flow of particulates outside the array housing.
Innovation Solution
A multilayer structure comprising a filter layer sandwiched between inner and outer support layers, which supports the filter layer and allows gas to vent while blocking particulates, is integrated into the battery array housing to prevent particulates from escaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venting system is provided for battery cells, then gas can be vented from the battery cells, but particulates can escape with the gas and cause electrical shorts
Solution Approach 1:
A filter layer is introduced as an intermediary component between the battery cell vent and the external environment. This filter layer selectively allows gas molecules to pass through while intercepting and retaining particulate matter, thus resolving the contradiction between maintaining venting functionality and preventing particulate escape that could cause electrical shorts.
Solution Approach 2:
The filter layer utilizes porous material structure with specific pore sizes that permit gas flow while blocking particulates. The porous structure provides sufficient open area for gas venting while the pore dimensions are controlled to trap particulate matter, thereby achieving both gas venting and particulate filtration simultaneously.
2Object-affected harmful factors
If a filter layer is added to block particulates, then particulate escape is prevented, but gas flow may be restricted
Solution Approach 1:
The filter layer employs porous material with optimized pore size and distribution that maintains high gas permeability while effectively trapping particulates. The porous structure provides sufficient flow channels for gas to pass through with minimal resistance while the pore walls intercept particulate matter, thus preventing particulate escape without significantly restricting gas flow.
Solution Approach 2:
The filter layer may utilize composite material construction combining different materials with complementary properties - one material providing structural integrity and pore formation for gas flow, and another material enhancing particulate capture capability. This composite approach optimizes both gas permeability and particulate blocking performance.
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 multilayer structure effectively vents gas while trapping particulates within the array housing, preventing electrical shorts and ensuring safe operation of the battery pack.
Implementation Method 1
a filter layer permitting a flow of gas vented from at least one battery cell within the plurality of battery cells to an area outside the array housing, the filter layer blocking a flow of particulates vented from the at least one battery cell
Data Source
AI summary
A traction battery assembly includes an array housing that houses battery cells, and a filter layer permitting a flow of gas vented from at least one of the battery cells to an area outside the array housing. The filter layer blocks a flow of particulates vented from the at least one battery cell to the area outside the array housing.