Battery Cell Vent Placement for Shorter Pack Exhaust Paths
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Solution Overview
Problem
Existing electric storage devices with exhaust valves on side surfaces face reduced exhaust efficiency due to increased distance between the exhaust valve and the gas exhaust duct when positioned at the top of the battery pack.
Innovation Solution
The electric storage device is designed with a case exhaust valve above or below the center of the housing case, and a cell exhaust valve above or below the center of the electric storage cell, optimizing the exhaust path and reducing contact area between high-temperature gas and the cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gas exhaust duct is provided at the top of the battery pack, then the structure is simplified, but the distance between the exhaust valve and the gas exhaust duct increases reducing exhaust efficiency
Solution Approach 1:
The patent changes the vertical position of the case exhaust valve from the top to the bottom of the housing case. This dimensional change in valve placement creates a more favorable spatial relationship with side-surface exhaust valves, shortening the exhaust path and improving exhaust efficiency without complicating the overall structure.
2Length of moving object
If the case exhaust valve is provided at the top of the housing case, then the gas discharge path is shortened, but the high-temperature gas contacts more area of the storage cell causing damage
Solution Approach 1:
The patent relocates the case exhaust valve to the bottom of the housing case, changing the vertical dimension of gas flow. This bottom-positioned configuration allows the exhaust gas to travel horizontally along the bottom surface rather than vertically along the cell surface, reducing the contact area between high-temperature gas and the storage cell while maintaining an efficient exhaust path.
Data Source
AI summary
An electric storage device includes a plurality of electric storage cells and a housing case. Each of the plurality of electric storage cells includes a cell exhaust valve that is provided on a side surface of the electric storage cell and exhausts gas in the electric storage cell. The housing case includes a lower case, an upper case, and a case exhaust valve. The case exhaust valve is provided above or below the center of the housing case in the height direction. When the case exhaust valve is provided above the center of the housing case, the cell exhaust valve is provided above the center of the electric storage cell in the height direction. When the case exhaust valve is provided below the center of the housing case, the cell exhaust valve is provided below the center of the electric storage cell in the height direction.