Battery Cell Cover Attachment for Controlled Vent Gas Containment
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Solution Overview
Problem
Conventional venting systems in battery modules risk thermal propagation and runaway due to venting gas deposition and pressure, leading to adjacent cell damage and potential fires.
Innovation Solution
A heat-resistant cover element, such as a mica sheet, is securely adhered to battery cells via adhesive around venting exits, ensuring sealed coverage and rupture at specific points to contain venting gas, preventing thermal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional venting system is used without a cover element, then the venting gas can escape freely, but thermal propagation occurs to adjacent cells causing safety issues
Solution Approach 1:
A cover element is introduced as an intermediary component between the venting exit and the adjacent battery cells. This cover element captures the venting gas stream discharged from the affected cell and redirects it away from neighboring cells, preventing thermal propagation while maintaining safe venting functionality.
Solution Approach 2:
The venting gas stream, which is harmful when it contacts adjacent cells, is converted into a controlled flow that is redirected away from other cells. The cover element transforms the potentially dangerous direct discharge into a controlled redirection path, turning the harmful venting process into a safe operation.
2Ease of manufacture
If adhesive strips are applied along stacking direction to secure cover element, then manufacturing is simplified, but venting gas can flow under the cover element causing thermal propagation
Solution Approach 1:
An adhesive layer is applied in advance around the periphery of the venting exit, creating a pre-formed sealing structure. This preliminary adhesive application ensures that when the cover element is placed, the venting gas stream is immediately contained and redirected, preventing it from flowing under the cover element to adjacent cells.
Solution Approach 2:
The adhesive is applied locally around the periphery of the venting exit rather than uniformly across the entire cover element. This localized adhesive application provides precise sealing at the critical area where venting gas emerges, ensuring reliable containment while maintaining ease of manufacture.
3Ease of operation
If the cover element is made thin to allow rupture at venting exits, then gas release is enabled, but the cover element may lift off and allow gas flow to adjacent cells
Solution Approach 1:
The cover element is constructed as a thin, flexible sheet that can deform and rupture at the venting exits to allow gas release. The thin film design enables the cover to break open under pressure while maintaining overall structural integrity and adhesive bonding at the periphery, preventing complete lift-off and gas leakage to adjacent cells.
Solution Approach 2:
The adhesive layer is applied in advance around the venting exit periphery, creating a predetermined attachment pattern. This preliminary adhesive placement ensures that when the thin cover element ruptures to release gas, the adhesive bonds prevent the cover from completely detaching, maintaining containment and redirecting the gas flow safely.
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 solution effectively contains venting gas, preventing thermal runaway in adjacent cells by ensuring secure sealing and controlled gas release, thereby enhancing safety and reliability of battery systems.
Implementation Method 1
The cover element is directly sealed to the venting side of the battery cell by an adhesive extending around the venting exit
Data Source
AI summary
A battery system includes: a plurality of battery cells, each of the battery cells having a venting exit for discharging a venting gas stream at a venting side thereof; and a cover element covering at the venting side of at least one of the plurality of battery cells to protect the battery cell from the venting gas stream. The cover element is directly sealed to the venting side of the battery cell by an adhesive extending around the venting exit.