Power Storage Cell Vent Layout to Prevent Gas Valve Blockage
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Solution Overview
Problem
Existing power storage cells and devices face instability in gas discharge due to electrode body positioning, which can block gas release valves, leading to incomplete gas discharge from the housing.
Innovation Solution
The power storage cell design includes gas discharge valves on both side surfaces of the housing, with at least a portion of each valve's opening located in a region projected by an upper clearance, ensuring that gas can be discharged stably even when the electrode body moves or rises due to pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas discharge valve is provided on the side surface of the housing, then gas discharge is enabled, but the opening may be blocked when the electrode body moves or rises due to pressure
Solution Approach 1:
The gas discharge valve opening is positioned in a region that is not directly in the path of electrode body movement. By projecting the upper clearance region onto the side surface and placing the valve opening in this projected region, the design utilizes spatial dimensionality to ensure the valve remains accessible even when the electrode body shifts vertically or horizontally, preventing blockage while maintaining discharge functionality.
Solution Approach 2:
The side surface of the housing is divided into multiple regions, with the gas discharge valve positioned in a specific zone that is distinct from the electrode body's movement path. This spatial segmentation ensures that the valve opening remains in a safe zone that is not obstructed by electrode body displacement, allowing reliable gas discharge without interference from moving components.
2Volume of stationary object
If the electrode body is positioned closer to one side surface, then space utilization is improved, but the gas discharge valve opening may be blocked
Solution Approach 1:
The gas discharge valve is positioned asymmetrically on the side surface, specifically in a region that is not directly adjacent to where the electrode body may shift. This asymmetric placement strategy allows the electrode body to be positioned closer to one side for better space utilization while ensuring the valve remains in a protected zone that maintains discharge functionality even under asymmetric pressure conditions.
3Reliability
If the gas release valve is provided on the upper lid, then gas discharge is enabled, but the opening may be blocked when the electrode body rises upward due to gas pressure
Solution Approach 1:
Instead of placing the gas discharge valve on the upper lid where it would be directly in the path of rising electrode bodies, the invention relocates the valve to the side surface of the housing. This dimensional relocation from vertical (lid) to lateral (side surface) positioning ensures that even when electrode bodies rise upward due to internal gas pressure, the valve opening remains accessible and unblocked, maintaining reliable gas discharge capability.
Data Source
AI summary
A electrode body of a power storage cell is accommodated in an inner space of a housing to form an upper clearance on a side opposite to a bottom surface of the housing and form a side clearance between the electrode body and each of a first side surface and a second side surface of the housing. Gas discharge valves include a first discharge valve provided on the first side surface and a second discharge valve provided on the second side surface. At least a portion of an opening of the first discharge valve is located at a region of the first side surface to which the upper clearance is projected, and at least a portion of an opening of the second discharge valve is located at a region of the second side surface to which the upper clearance is projected.