Battery Cell Pressure Relief Weak-Section Sizing Against Premature Rupture
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Solution Overview
Problem
Pressure relief components in battery cells are prone to premature actuation or rupture due to fatigue, reducing the reliability and safety of battery cells over time.
Innovation Solution
A battery cell design with a pressure relief component featuring a first weak portion on its shell, defined by specific dimensions and groove structures, to manage pressure relief effectively, reducing the risk of untimely rupture and improving structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first wall portion size is increased, then the pressure relief component can relieve pressure more effectively, but the deformation of the first weak section increases leading to reduced structural strength
Solution Approach 1:
The patent optimizes the dimensional parameters of the first wall portion (width W and length L) and the first weak section (cross-sectional area S1) to achieve the desired balance. By setting specific parameter ranges, the design ensures adequate pressure relief capability while controlling deformation and maintaining structural strength.
2Reliability
If the first weak section area is increased, then the pressure relief component can relieve pressure more effectively, but the bursting pressure becomes excessively high
Solution Approach 1:
The patent carefully controls the cross-sectional area S1 of the first weak section within a specific range. This parameter optimization ensures that the weak section is sufficiently weak to rupture at appropriate pressure levels for effective pressure relief, while not being so weak that it requires excessively high bursting pressure.
3Strength
If the first wall portion size is decreased, then the deformation of the first weak section is reduced, but the pressure relief capability is insufficient
Solution Approach 1:
The patent establishes minimum dimension requirements for the first wall portion (width W ≥ 10mm, length L ≥ 10mm) and the first weak section (cross-sectional area S1 ≥ 0.006mm²). These minimum parameter values ensure that the structure has sufficient pressure relief capability while maintaining adequate structural strength.
Data Source
AI summary
A battery cell, a battery, and an electrical device are disclosed. The battery cell includes a shell having a first wall portion and a pressure relief component disposed on the first wall portion. The pressure relief component includes a first weak portion that defines at least one predetermined pressure relief region and is configured to rupture along at least part of the first weak portion when the battery cell undergoes pressure relief. In a width direction of the first wall portion, the first wall portion has a size W of 10 mm to 100 mm. The first weak portion includes at least one first weak section having a cross-sectional area S1 of 0.006 mm2 to 0.15 mm2 perpendicular to its extension direction. This structure reduces the risk of premature rupture and liquid leakage, improves pressure relief response, and enhances the operational reliability of the battery cell.