Dual-Sided Battery Cell Venting for Lower Detonation Pressure
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Solution Overview
Problem
Existing battery technologies face safety issues such as fire and explosion due to inadequate pressure relief mechanisms, where the pressure relief groove is typically disposed on a single side of the pressure relief body, leading to high detonation pressure and untimely pressure release.
Innovation Solution
A pressure relief apparatus with pressure relief grooves on both sides of the pressure relief body, forming a weak portion that ruptures when pressure or temperature reaches a threshold, allowing for timely pressure release and reducing the risk of fire and explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure relief groove is disposed on a single side of the pressure relief body, then the structure is simple, but the detonation pressure is high and pressure release is delayed
Solution Approach 1:
The pressure relief body is segmented by disposing pressure relief grooves on both the first surface and second surface, dividing the single-side relief mechanism into a dual-side relief system. This segmentation reduces the residual thickness and creates a weaker portion that can rupture at lower pressures, achieving timely pressure release while maintaining structural integrity during normal operation.
2Reliability
If the weak portion thickness is reduced to reduce detonation pressure, then pressure release becomes timely, but the strength of the pressure relief body decreases
Solution Approach 1:
The pressure relief body exhibits local quality differentiation: the weak portion between the two opposite grooves has reduced thickness for easy rupture and timely pressure release, while the rest of the body maintains sufficient thickness and strength. This localized thinning achieves the desired pressure relief function without compromising overall structural integrity.
3Strength
If the weak portion thickness is increased to maintain strength, then structural integrity is improved, but pressure release is delayed
Solution Approach 1:
The solution transitions from a single-side groove configuration to a dual-side groove configuration, adding a dimensional aspect to the pressure relief mechanism. By disposing grooves on both the first and second surfaces, the effective pressure relief path is created without increasing the thickness of the weak portion, achieving timely release while maintaining strength.
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 effectively reduces detonation pressure, ensures timely pressure release, and enhances the safety of battery cells by accurately controlling the thickness of the weak portion and increasing the pressure relief area, thereby preventing accidents.
Implementation Method 1
a weak portion is formed between the two pressure relief grooves, and the weak portion is configured to rupture when a pressure or a temperature inside the battery cell reaches a threshold, so as to release the pressure inside the battery cell
Data Source
AI summary
A pressure relief apparatus used for a battery cell includes a pressure relief body and two pressure relief grooves. The pressure relief body has a first surface and a second surface disposed opposite in its thickness direction. The two pressure relief grooves are disposed opposite in the thickness direction and disposed on the first surface and the second surface separately, a weak portion is formed between the two pressure relief grooves, and the weak portion is configured to rupture when a pressure or temperature inside the battery cell reaches a threshold, so as to release the pressure inside the battery cell.