Battery Stack Vent Valve Layout to Limit Thermal Interference
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Solution Overview
Problem
Conventional power storage devices face issues with mutual heat generation between adjacent power storage stacks due to gas discharge, which can lead to increased thermal interference.
Innovation Solution
The power storage device is configured with first and second power storage stacks spaced apart and equipped with exhaust valves on opposite sides to discharge gases away from each other, utilizing the accommodation case walls as exhaust paths to prevent mutual heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If exhaust valves are provided on both side surfaces in the longitudinal direction to enhance gas discharge efficiency, then gas discharge efficiency is improved, but thermal interference between adjacent power storage stacks increases due to mutual heat generation
Solution Approach 1:
The exhaust valves on adjacent power storage stacks are positioned asymmetrically relative to each other. Specifically, when one stack has its exhaust valve on a particular side, the adjacent stack has its exhaust valve on the opposite side. This asymmetric arrangement ensures that exhaust gases from one stack do not directly impinge on the adjacent stack, thereby reducing thermal interference while maintaining effective gas discharge from both stacks.
2Area of stationary object
If power storage stacks are disposed adjacent to each other to optimize space utilization, then space efficiency is improved, but mutual heat generation occurs when one stack discharges gas to the other
Solution Approach 1:
The patent employs asymmetric positioning of exhaust valves on adjacent power storage stacks. This asymmetric configuration allows the stacks to be disposed close together for optimal space utilization while preventing the direct flow of hot exhaust gases from one stack to the adjacent stack, thereby minimizing mutual heat generation despite the close proximity.
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 configuration effectively suppresses mutual heat generation between power storage stacks by directing discharged gases away from each other, optimizing space utilization and maintaining connector integrity.
Implementation Method 1
Each of the plurality of first unit cells is provided with a first exhaust valve that can discharge a gas toward a side opposite to a side where the second power storage stack is located
Data Source
AI summary
A power storage device includes: a first power storage stack and a second power storage stack spaced apart from each other in a first direction; and an accommodation case, wherein the accommodation case is provided with a case-side exhaust valve, the first power storage stack includes a plurality of first unit cells arranged in a second direction orthogonal to the first direction, the second power storage stack includes a plurality of second unit cells arranged in the second direction, each of the plurality of first unit cells is provided with a first exhaust valve that can discharge a gas toward a side opposite to a side where the second power storage stack is located, and each of the plurality of second unit cells is provided with a second exhaust valve that can discharge a gas toward a side opposite to a side where the first power storage stack is located.