Battery Compartment Vent Cover for Emergency Overpressure Release
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Solution Overview
Problem
Existing battery pressure compensation systems are complex and lack simplicity, durability, and effective pressure compensation, particularly in emergency ventilation scenarios.
Innovation Solution
A ventilation arrangement for battery compartments featuring a connection element with an annular body, a gas-permeable membrane, and a cover that nests along the annular body. The cover is designed to pierce the membrane when overpressure exceeds a threshold, allowing unfiltered gas flow and featuring a locking member that deforms to unlock the cover's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cover with many openings is used for air release, then gas venting capability is improved, but membrane fouling accelerates
Solution Approach 1:
The cover is divided into two functional zones: a first zone with multiple openings for controlled gas release that minimizes fouling, and a second zone without openings that provides structural support and protects the membrane. This segmentation allows the system to achieve adequate venting capability while reducing the area exposed to fouling conditions.
Solution Approach 2:
Different regions of the cover are assigned different properties: the first zone has permeable characteristics with multiple openings for gas flow, while the second zone has impermeable characteristics without openings to protect the membrane. This local differentiation optimizes both venting performance and membrane protection.
2Reliability
If a complex assembly is used for pressure compensation, then safety is improved, but device complexity increases
Solution Approach 1:
The cover integrates multiple functions into a single component: it provides structural support for the membrane, enables controlled gas release through its first zone, protects the membrane through its second zone, and maintains pressure differential. This merging reduces assembly complexity while maintaining safety functions.
Solution Approach 2:
The cover serves multiple purposes simultaneously: it acts as a support structure, a flow control element, a protective barrier, and a pressure sensing element. This multi-functionality reduces the number of separate components needed while ensuring comprehensive safety.
3Reliability
If the cover is firmly attached to block the channel, then sealing is improved, but emergency venting is reduced
Solution Approach 1:
The cover's attachment to the membrane is designed to be dynamically responsive to pressure conditions. Under normal conditions, the cover maintains firm attachment to block the channel and prevent fouling. Under emergency overpressure conditions, the membrane deforms to overcome the attachment force, causing the cover to detach and enable emergency venting.
Solution Approach 2:
The cover is pre-positioned and attached to the membrane in a blocking configuration before any pressure event occurs. This preliminary blocking action prevents fouling during normal operation, while the design ensures that emergency venting capability is preserved through the detachable attachment mechanism.
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 provides effective pressure equilibration during emergency situations, such as thermal runaway, while maintaining a simple and durable design, reducing the risk of membrane fouling and enhancing safety.
Implementation Method 1
a gas permeable membrane or filtration part able to retain dust while allowing filtering a gaseous fluid in the channel
Implementation Method 2
the membrane or filtration part is deformable with a mobile portion that can move towards a blocking portion (belonging to the cover) in response to an overpressure from a side opposite the cover
Implementation Method 3
at least one locking member locking an axial nesting position of the cover... can disengage from said holding edge by deformation in case of exceeding an overpressure threshold
Data Source
AI summary
An arrangement which includes a connector mounted over an opening of a battery casing, delimiting a gas flow channel. A cover is fitted onto an annular body of the connector to cover the channel in a non-sealing manner, an internal membrane provided in the channel allowing filtration. The axial fitted position of the cover, locked by a locking member, is a position in which: a tip of the cover is placed in the vicinity of the membrane which can thus be torn in the event of critical deformation towards the tip under the effect of an overpressure prevailing against the cover; and the member abuts axially against the connector. The member can deform in order to unlock the fitting of the cover when the overpressure in the channel exceeds a threshold at the time of or after the tearing of the membrane.