Battery Housing Vent Diaphragm With Reproducible Burst Relief
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Solution Overview
Problem
Existing pressure equalization devices for electrochemical and electrotechnical devices, such as battery housings, suffer from inconsistent and unpredictable bursting behavior due to dimensional tolerances between components, leading to unreliable pressure relief during overloads.
Innovation Solution
The diaphragm is directly connected to a burst element via a material bond, ensuring reproducible bursting behavior by initiating rupture at a defined point when internal pressure exceeds safe limits, rather than relying on a tolerance-dependent distance between a cutting element and the diaphragm surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a distance is provided between the cutting element and the diaphragm surface to accommodate dimensional tolerances, then the device can be manufactured with standard tolerances, but the bursting behavior becomes inconsistent and unpredictable
Solution Approach 1:
The burst element is integrated directly into the housing structure, eliminating the separate positioning component. This merging of the burst element with the housing ensures that the rupture initiation point is fixed and reproducible, directly addressing the reliability issue while maintaining manufacturing feasibility through the material bond connection to the diaphragm
Solution Approach 2:
The diaphragm is pre-connected to the burst element via a material bond at a defined location. This preliminary connection ensures that when pressure builds up, the diaphragm will rupture at the predetermined burst element location rather than at an unpredictable distance, guaranteeing consistent bursting behavior without requiring tight dimensional tolerances
2Reliability
If the diaphragm is connected to the burst element via a material bond, then reproducible bursting behavior is achieved, but the device complexity increases
Solution Approach 1:
The burst element is merged with the housing structure, eliminating the need for separate mounting components. This integration reduces device complexity while maintaining the reproducible bursting behavior achieved through the material bond connection between the diaphragm and burst element
Solution Approach 2:
The diaphragm itself serves as both the pressure-containing element and the rupture element. By using the flexible diaphragm material to bond directly to the burst element, the design eliminates additional rigid connection components, reducing overall device complexity while ensuring reproducible rupture behavior
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 design guarantees consistent and reliable pressure relief by ensuring the diaphragm ruptures predictably at the burst element, improving the response to sudden pressure increases and reducing the risk of unintended damage.
Implementation Method 1
the diaphragm is designed to be gas-permeable... During normal operation, the diaphragm can be used to equalize certain pressure fluctuations between the interior of the receiving housing and the environment if the diaphragm is designed to be gas-permeable
Implementation Method 2
If the internal pressure in the interior of the receiving housing rises suddenly, this pressure has to be relieved immediately... a burst element is provided in the pressure equalization devices according to the invention, which burst element then destroys the diaphragm at at least one point. In pressure equalization devices according to the invention, this can be achieved by deforming the diaphragm to such an extent that it is destroyed at the burst element
Implementation Method 3
the diaphragm is destroyed at least at one point under the action of the burst element to establish a flow connection from the interior to the exterior through the gas passage opening
Data Source
AI summary
The invention relates to a pressure equalization device (20) for equalizing an internal pressure in a receiving housing of an electrochemical or electrotechnical device, in particular a battery housing, having a housing (20.3) that has at least one gas passage opening (20.4), which forms a gas-permeable connection between an interior (20.1) and an exterior (20.2) of the housing (20.3), wherein the gas passage opening (20.4) is blocked by means of a gas-permeable or gas-tight diaphragm (40), wherein the diaphragm (40) is assigned a burst element (30), which is designed and positioned such that, when the diaphragm (40) is deformed in the direction of the exterior (20.2), the diaphragm is destroyed at least at one point under the action of the burst element (30) to establish a flow connection from the interior (20.1) to the exterior (20.2) through the gas passage opening (20.4). In order to be able to achieve a reproducible bursting behavior in such a pressure equalization device by simple means, according to the invention provision is made for the diaphragm (40), its inner face (42) facing the interior (20.1) of the housing (20.3), to be connected, in particular by a material bond, to the burst element (30).