Battery End Cover Assembly With Sized Pressure Relief Venting
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Solution Overview
Problem
Existing battery end cover assemblies have untimely pressure relief issues due to inconsistent pressure relief mechanisms, leading to potential explosions and reduced safety.
Innovation Solution
A battery end cover assembly with a pressure relief mechanism that occupies 0.5% to 5% of the end cover area, strategically positioned to ensure timely and efficient pressure relief, while maintaining structural integrity and avoiding interference with terminal assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief mechanism area is increased, then the pressure relief capacity is improved, but the area occupied on the end cover increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pressure relief mechanism area to account for 0.5% to 5% of the end cover area, and the preset opening area to account for at least half to no more than 95% of the pressure relief mechanism area. These optimized parameter ranges ensure adequate pressure relief capacity while minimizing the area occupied on the end cover, thus resolving the contradiction between pressure relief capacity and end cover area utilization.
2Area of stationary object
If the pressure relief mechanism area is decreased, then the area occupied on the end cover is reduced, but the pressure relief capacity is insufficient
Solution Approach 1:
The patent establishes minimum parameter thresholds to prevent insufficient pressure relief capacity. The pressure relief mechanism area is set to no less than 0.5% of the end cover area, and the preset opening area is set to no less than half of the pressure relief mechanism area. These lower bound parameters ensure that even with minimal area occupation, the pressure relief capacity remains sufficient for safety requirements.
3Productivity
If the pressure relief mechanism is positioned closer to terminal assemblies, then the space utilization is improved, but the structural integrity is compromised
Solution Approach 1:
The patent applies local quality by specifying that the pressure relief mechanism and terminal assemblies be distributed at intervals in the length direction of the end cover. This spatial distribution creates distinct functional zones, allowing the pressure relief mechanism to be positioned optimally for space utilization while maintaining sufficient distance from terminal assemblies to preserve structural integrity and avoid interference.
4Ease of manufacture
If the pressure relief mechanism area ratio is not optimized, then the manufacturing is simpler, but the safety is reduced due to untimely pressure relief
Solution Approach 1:
The patent defines specific parameter ranges (pressure relief mechanism area: 0.5%-5% of end cover area; preset opening area: 50%-95% of pressure relief mechanism area) that balance manufacturing simplicity with safety. These standardized ratios enable straightforward manufacturing processes while ensuring adequate pressure relief capacity to prevent untimely pressure relief and battery explosion, thus resolving the contradiction between ease of manufacture and safety.
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 ensures timely pressure relief, reduces the risk of untimely explosions, and enhances the safety and reliability of the battery by balancing the area and positioning of the pressure relief mechanism, ensuring smooth exhaust and preventing deformation.
Implementation Method 1
when an internal pressure of the battery exceeds a specified value, a thin wall of the valve body ruptures to release the internal pressure
Data Source
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AI summary
The present application discloses a battery end cover assembly, an energy storage apparatus and an electric device. The battery end cover assembly includes an end cover; terminal assemblies connected to the end cover; and a pressure relief mechanism disposed on the end cover, wherein the area of a figure formed by an outer contour of the end cover is a first area S1, the area of a projection of the pressure relief mechanism on the end cover is a second area S2, and the second area S2 accounts for 0.5% to 5% of the first area S1. According to the present application, the probability of untimely pressure relief is reduced, and the safety of a battery is improved. Moreover, the overall structural strength of the battery end cover assembly can be guaranteed, and the probability that the pressure relief mechanism falls off to be invalid is reduced.