Battery Cell Pressure Sensor Sealing Without Cover Plate Penetration
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Solution Overview
Problem
Existing battery cell information collection devices that penetrate into the interior require modifications to the cover plate, increasing complexity and reducing reliability.
Innovation Solution
An information collection device is arranged inside the battery cell with an air pressure sensor snap-fitted into a casing, sealed by a gas-permeable membrane to acquire parameters without penetrating the cover plate, using a sealing member to prevent liquid ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an external collection device with penetrating collection terminal is used, then information collection is achieved, but the cover plate complexity increases and reliability decreases
Solution Approach 1:
The collection device is extracted from the external arrangement and moved inside the battery cell. The air pressure sensor is installed within the battery cell interior, eliminating the need for penetrating terminals through the cover plate. This extraction resolves the contradiction by achieving information collection without compromising cover plate integrity or increasing its complexity.
Solution Approach 2:
A gas-permeable membrane is introduced as an intermediary between the air pressure sensor and the battery cell interior. This membrane allows gas to pass through for pressure sensing while blocking liquid electrolyte, enabling information collection without direct penetration of the cover plate or cell structure.
2Loss of information
If an external collection device with penetrating collection terminal is used, then information collection is achieved, but the cover plate reliability is reduced
Solution Approach 1:
The collection device is relocated from external to internal positioning within the battery cell. By installing the air pressure sensor inside the cell and using a gas-permeable membrane for sealing, the cover plate no longer requires penetrating terminals, thus maintaining its structural integrity and reliability while still enabling information collection.
Solution Approach 2:
A gas-permeable membrane is used as a flexible sealing element that allows gas transmission for pressure sensing while preventing liquid electrolyte ingress. This thin film structure enables the air pressure sensor to be sealed within the battery cell without requiring rigid penetrating terminals through the cover plate, thereby preserving cover plate reliability.
3Reliability
If a sealed structure is used to prevent liquid ingress, then reliability is improved, but gas passage for pressure sensing is blocked
Solution Approach 1:
A gas-permeable membrane with porous structure is used as the sealing element. This porous material allows gas molecules to pass through for air pressure sensing while its pore structure prevents liquid electrolyte from penetrating into the sealed cavity containing the air pressure sensor. This resolves the contradiction by providing both sealing performance and gas passage capability.
Solution Approach 2:
The gas-permeable membrane represents a composite material structure that combines selective permeability properties - allowing gas transmission while blocking liquid. This composite material enables the sealing structure to simultaneously achieve reliability through liquid prevention and information collection through gas passage.
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 enhances sealing performance, simplifies structure, and maintains reliability by allowing gas passage while preventing liquid ingress, thus mitigating structural complexity and reliability issues of the cover plate.
Implementation Method 1
a sealing member sealing the first installation hole, the sealing member being used to allow gas to pass through and prevent liquid from passing through
Data Source
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AI summary
An information collection device includes a casing, an air pressure sensor, and a sealing member. The casing has a first installation hole, the air pressure sensor is installed inside the casing, and at least a part of the air pressure sensor is snap-fitted into the first installation hole to acquire an air pressure parameter outside the casing. The sealing member seals the first installation hole, and the sealing member is used to allow gas to pass through and prevent liquid from passing through. Thereby, the information collection device is arranged in the battery cell, enabling it to collect information in an environment of electrolyte, thus mitigating the technical problems of complex structure and insufficient reliability of the cover plate of the battery cell caused by the external arrangement of the prior art information collection device.