Battery Cell Pressure Relief Groove Layout for Controlled Venting
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Solution Overview
Problem
Pressure relief components in battery cells are prone to premature activation or rupture due to fatigue, reducing the reliability and safety of battery cells over time, leading to risks of bursting, explosion, and fire.
Innovation Solution
The battery cell design includes a pressure relief component with specific dimensions and grooves that balance rigidity and deformation, allowing controlled pressure relief, reducing the risk of untimely rupture and improving structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the width of the first wall portion is increased, then the deformation of the first wall portion is increased, but the structural strength is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the width of the first wall portion to a specific range (10-100mm) and the sum of areas of pressure relief regions to a specific range (300-1500mm²). These parameter adjustments balance the deformation capability and structural strength, allowing the wall to deform sufficiently for pressure relief while maintaining adequate structural integrity to prevent premature rupture.
2Stress or pressure
If the sum of areas of pressure relief regions is increased, then the stress on pressure relief regions is increased, but the deformation of first wall portion is increased
Solution Approach 1:
The patent uses parameter changes by defining specific ranges for the sum of areas of pressure relief regions (300-1500mm²) and the width of the first wall portion (10-100mm). These parameter optimizations ensure that the stress is distributed appropriately across the pressure relief regions while controlling the overall deformation of the first wall portion within acceptable limits.
3Stress or pressure
If the pressure bearing capacity of groove bottom wall is increased, then the bursting pressure is reduced, but the reliability is reduced due to pre-actuation
Solution Approach 1:
The patent applies local quality by creating grooves with different bottom wall thicknesses in specific locations of the pressure relief component. The groove bottom walls have reduced thickness (lower pressure bearing capacity) at predetermined regions while maintaining adequate thickness in other areas. This localized variation allows the component to rupture at controlled locations at the intended bursting pressure while preventing premature activation in non-groove areas.
Solution Approach 2:
The patent segments the pressure relief component by dividing it into different regions with different structural characteristics - groove regions with reduced wall thickness for controlled rupture and non-groove regions with full wall thickness for structural support. This segmentation allows different parts of the component to serve different functions: the groove regions facilitate pressure relief at specific locations while the overall structure maintains integrity.
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 design enhances the operational reliability and stability of battery cells by minimizing the risk of bursting, explosion, and liquid leakage, thereby prolonging the service life and improving safety.
Implementation Method 1
the width of the first wall portion is greater than or equal to 10 mm, which can reduce the rigidity of the first wall portion and increase the deformation of the first wall portion, thereby relieving the phenomenon that the bursting pressure for the pressure relief component to perform pressure relief on the battery cell is excessively high
Data Source
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AI summary
The present application provides a battery cell, a battery and an electrical device. The battery cell includes a shell and a pressure relief component; the shell includes a first wall portion; the pressure relief component is arranged on the first wall portion, and includes a first surface and a second surface which are oppositely arranged in the thickness direction of the first wall portion; the pressure relief component is provided with a first groove which is recessed from the first surface toward the second surface, the first groove defines at least one predetermined pressure relief region, and the pressure relief component is configured to be capable of rupturing along at least part of the first groove when the battery cell is subjected to pressure relief; and the width of the first wall portion is W, the sum of the areas of all predetermined pressure relief regions is S, and W and S meet: 10mm≤W≤100mm, 300mm2≤S≤1500mm2, which is conducive to prolonging the service life of the battery cell and improving the operational reliability of the battery cell.