Battery Gas Exhaust Valve Positioning to Prevent Terminal Corrosion
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Solution Overview
Problem
Rechargeable electric storage devices, such as lithium-ion battery cells, face issues with gas and electrolytic solution discharge from gas exhaust valves causing corrosion on external terminals due to adhesion.
Innovation Solution
The electric storage device is designed with a gas exhaust valve positioned farthest from the external terminals, and a shielding member is used to prevent discharge constituents from adhering to the terminals, enhancing the discharge efficiency and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gas exhaust valve is arranged on the cover plate along with the external terminals, then the device structure is simplified, but the constituents of discharged gas or electrolytic solution adhere to the external terminals causing corrosion
Solution Approach 1:
The device is divided into distinct functional zones: the external terminals are positioned in one region of the cover plate while the gas exhaust valve is positioned in a separate, distant region. This spatial segmentation prevents the discharged constituents from reaching the external terminals, eliminating the corrosion problem while maintaining structural simplicity.
2Object-affected harmful factors
If the gas exhaust valve is positioned far from external terminals, then corrosion is prevented, but the device structure becomes more complex
Solution Approach 1:
The gas exhaust valve and external terminals are arranged in different spatial regions of the cover plate, utilizing the two-dimensional surface area to maximize separation distance. This dimensional approach allows effective corrosion prevention without adding vertical complexity or additional components to the device structure.
Data Source
AI summary
An electric storage device is provided with an electrode assembly including a positive electrode plate and a negative electrode plate; a case for housing the electrode assembly; a positive-electrode external terminal arranged on an outer surface of the case and electrically connected to the positive electrode plate; a negative-electrode external terminal arranged on an outer surface of the case and electrically connected to the negative electrode plate; and a gas exhaust valve formed in a region of the case on the opposite side of a region where the positive-electrode external terminal and the negative-electrode external terminal are arranged.