Battery End Cover Pressure Relief Sizing for Vent Strength Balance
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Solution Overview
Problem
Existing battery end cover assemblies have an anti-explosion and pressure relief structure that is not optimally matched with the area of the end cover, leading to untimely pressure relief and compromised safety due to inconsistent pressure relief mechanisms.
Innovation Solution
A battery end cover assembly with a pressure relief mechanism that occupies 0.5% to 5% of the end cover area, strategically sized to ensure timely and controlled pressure relief, incorporating an anti-explosion valve with a notch groove and optimized thickness and tensile strength to prevent excessive deformation and ensure structural integrity.
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 structural strength of the end cover deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the area proportion of the pressure relief mechanism (0.5%-5% of end cover area), length proportion (5%-12% of end cover length), and width proportion (15%-25% of end cover width). These quantitative parameter optimizations resolve the contradiction by finding the optimal balance point where sufficient pressure relief capacity is achieved while maintaining end cover structural strength.
2Strength
If the pressure relief mechanism area is decreased, then the structural strength of the end cover is improved, but the pressure relief capacity deteriorates
Solution Approach 1:
The patent establishes minimum threshold parameters (area ≥0.5% of end cover area, length ≥5% of end cover length, width ≥15% of end cover width) to ensure the pressure relief mechanism maintains sufficient pressure relief capacity. These parameter constraints prevent the pressure relief area from being reduced below the level that would compromise safety, while still allowing optimization of structural strength.
3Reliability
If the pressure relief mechanism size is increased, then the pressure relief opening area is improved, but the space for terminal assemblies is reduced
Solution Approach 1:
The patent optimizes the spatial distribution by controlling the pressure relief mechanism to occupy only 0.5%-5% of the end cover area, with specific length (5%-12% of end cover length) and width (15%-25% of end cover width) proportions. This precise parameter control ensures adequate pressure relief opening area while preserving sufficient space for terminal assemblies and maintaining proper component spacing.
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 smooth and timely pressure relief, enhances the structural strength of the end cover, reduces the risk of fracture, and prevents unwanted gas emission, thereby improving the safety and reliability of the battery.
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
Implementation Method 2
the battery is prevented from being exploded and fractured
Data Source
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.