Battery Cell Pressure Relief Structure With Dual-Sided Vent Grooves
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Solution Overview
Problem
Existing battery technologies face safety issues such as fire and explosion due to inadequate pressure relief mechanisms, particularly when pressure relief grooves are machined on a single side of the pressure relief body, leading to untimely pressure release or high detonation pressures.
Innovation Solution
The pressure relief apparatus is designed with grooves on both sides of the pressure relief body, forming a weak portion that ruptures when pressure or temperature thresholds are reached, ensuring timely pressure release and reducing detonation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressure relief grooves are machined on a single side of the pressure relief body, then the structure is simpler, but the detonation pressure is high and pressure relief is delayed
Solution Approach 1:
The patent transitions from single-sided groove machining to double-sided groove machining, adding a dimensional aspect to the pressure relief structure. By machining grooves on both the first and second surfaces of the pressure relief body, the weak portion is formed through the thickness direction, significantly reducing detonation pressure and enabling timely pressure relief while maintaining reasonable structural complexity
2Reliability
If the minimum thickness of the weak portion is reduced to facilitate rupture, then pressure relief is improved, but the strength of the pressure relief body is insufficient
Solution Approach 1:
The patent applies local quality by creating a weak portion with specifically controlled minimum thickness (0.05mm-0.5mm) only in the necessary rupture area between the two grooves. The grooves themselves are positioned at specific distances from the edges (0.1mm-5mm), concentrating the structural modification where needed while preserving the overall strength of the pressure relief body for normal operation
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
This design effectively reduces the risk of fire and explosion by ensuring timely pressure relief, maintaining structural integrity, and improving the safety of battery cells.
Implementation Method 1
a weak portion is formed between the pressure relief groove on the first surface and the pressure relief groove on the second surface, and the weak portion is configured to rupture when a pressure or a temperature inside the battery cell reaches a threshold
Data Source
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Figure 3
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AI summary
Provided in the embodiments of the present application are a pressure relief apparatus, a cell, a battery and an electrical device, belonging to the technical field of batteries. Provided in the embodiments of the present application is a pressure relief apparatus used for a cell. The pressure relief apparatus comprises a pressure relief body and two pressure relief recesses. The pressure relief body is provided with a first surface and a second surface which are oppositely arranged in the thickness direction of the pressure relief body. The two pressure relief recesses are oppositely arranged in the thickness direction and are arranged on the first surface and the second surface respectively, a weak part being formed between the two pressure relief recesses, and the weak part being configured to crack when the pressure or temperature in the cell reaches a threshold value so as to relieve the pressure in the cell. The first surface and the second surface of the pressure relief body are provided with the pressure relief recesses respectively so that a relatively low residual thickness is realized, the thickness of the weak part is reduced and the weak part is easier to crack, thus reducing the explosion initiation pressure of the pressure relief device so as to enable the pressure relief body to relieve pressure in time, reducing the risks of fire, explosion and the like of a cell, and effectively improving the safety of the cell.