Battery Cell Pressure-Directing Layer for Moderate Gas Venting
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Solution Overview
Problem
Existing battery cells face issues with gas accumulation leading to performance degradation and safety risks due to inadequate venting mechanisms, especially when moderate gas generation occurs without significant pressure differential across the enclosure.
Innovation Solution
A pressure-directing layer is introduced between the battery cell and the shell, featuring openings overlying the venting portion of the enclosure, which directs gas to the venting area, creating a higher pressure differential and facilitating effective gas release through the venting portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas-permeable membrane is used to vent gas from the battery cell, then gas can exit the enclosure when significant ballooning occurs, but moderate gas generation does not create sufficient pressure differential to drive gas through the membrane
Solution Approach 1:
The enclosure is segmented into a gas-impermeable portion and a gas-permeable membrane portion. The pressure-directing layer is segmented with openings that align with the membrane portion, creating localized pressure channels that direct gas flow to the venting area even with moderate pressure differentials.
Solution Approach 2:
The pressure-directing layer acts as an intermediary component between the battery cell enclosure and the shell. It has a first surface that contacts the enclosure and a second surface that contacts the shell, with openings that channel pressure to the gas-permeable membrane portion, enabling effective venting without requiring significant overall ballooning.
2Reliability
If the battery cell expands to create pressure differential for gas venting, then gas can be forced through the membrane, but the expansion causes swelling that impinges on chassis components and deforms the chassis
Solution Approach 1:
The pressure-directing layer is pre-configured with openings that align with the gas-permeable membrane portion before any gas generation occurs. This preliminary configuration ensures that when moderate gas generation happens, the pressure is immediately directed to the venting area, preventing significant cell expansion and protecting the chassis from deformation.
Solution Approach 2:
The pressure-directing layer creates localized pressure concentration at the membrane portion rather than distributing pressure uniformly across the entire enclosure. This local quality approach allows gas venting to occur at specific points without requiring overall cell expansion, thereby preventing harmful swelling effects on the chassis and components.
3Quantity of substance
If no pressure-directing layer is used, then the battery cell structure remains simple, but gas accumulation occurs because moderate gas generation does not create sufficient pressure differential across the enclosure
Solution Approach 1:
The gas-permeable membrane portion functions as a porous material that allows gas to pass through when pressure is applied. The pressure-directing layer with its openings works in conjunction with this porous membrane to channel gas flow, enabling effective venting of accumulated gas without requiring complex active pumping or control systems.
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 solution enhances gas venting from battery cells, reducing swelling and associated safety risks by ensuring efficient gas release even during moderate gas generation, thereby improving battery performance and safety.
Implementation Method 1
The concentration of gas at the venting portion can yield a higher pressure differential across the venting portion and thereby promote the venting of gas out of the enclosure through the venting portion
Data Source
AI summary
A system can comprise a shell, one or more battery cells disposed within the shell, and a pressure-directing layer disposed between the battery cell(s) and the shell's interior surface. Each of the battery cell(s) can comprise an enclosure including a gas-impermeable portion and a venting portion configured to permit gas to exit the enclosure. The pressure-directing layer can comprise one or more openings that each overlie the venting portion of the enclosure of at least one of the battery cell(s). In some systems, the pressure-directing layer can have a thickness that is less than a distance between the battery cell(s) and the interior surface of the shell such that there is a space between the battery cell(s) and the interior surface of the shell. In some systems, the pressure-directing layer can be coupled to the battery cell(s) and the interior surface of the shell and comprise a resilient material.