Battery Cell End Cover Venting With Dual-Recess Burst Control
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Solution Overview
Problem
Existing batteries are poor in safety due to inadequate pressure relief mechanisms, leading to potential explosions or ignitions when internal pressure reaches bursting levels.
Innovation Solution
The end cover for battery cells features a pressure relief portion with a weakened area that is designed to break under internal pressure, relieving stress through recesses and notched grooves strategically arranged to ensure consistent bursting pressure and rapid pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief mechanism is added to improve battery safety, then safety is improved, but device complexity increases
Solution Approach 1:
The end cover is divided into multiple functional regions: a first recess for receiving a protector, a second recess for receiving a sealing ring, and a pressure relief portion with a weakened portion. This segmentation allows each region to perform its specific function independently, improving safety without requiring a completely new complex structure.
Solution Approach 2:
The weakened portion is pre-formed in the pressure relief portion during manufacturing, creating a predetermined break point before any pressure event occurs. This preliminary preparation ensures that when internal pressure reaches bursting levels, the end cover will reliably break at the weakened portion to relieve pressure, rather than failing unpredictably elsewhere.
2Ease of manufacture
If the end cover thickness is reduced to facilitate weakened portion formation, then manufacturing ease is improved, but structural strength deteriorates
Solution Approach 1:
The end cover exhibits non-uniform thickness distribution: the pressure relief portion has a reduced thickness to facilitate weakened portion formation and pressure relief, while other portions maintain sufficient thickness for structural strength. The first recess and second recess create localized thinning only where needed for the pressure relief function.
Solution Approach 2:
Instead of uniformly reducing thickness throughout the end cover, the design uses recesses (first recess and second recess) to create localized thickness variations in specific dimensions. This allows the weakened portion to be formed more easily in the pressure relief area without compromising the overall structural integrity of the end cover in other critical areas.
3Reliability
If recesses are added to create thinning effect, then pressure relief performance is improved, but manufacturing complexity increases
Solution Approach 1:
The first recess and second recess are integrated into a single end cover component rather than being separate parts. These recesses are formed during the stamping or molding process, combining multiple functions (protector mounting, sealing ring mounting, and pressure relief) into one unified structure, which reduces assembly complexity despite the increased geometric complexity.
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 enhances the safety of battery cells by ensuring consistent and controlled pressure relief, reducing the risk of explosions or ignitions and improving overall safety performance.
Implementation Method 1
the weakened portion is configured to be broken when pressure is to be relieved from the battery cell
Implementation Method 2
The first recess and the second recess achieve a thinning effect, so that the pressure relief portion located between the first bottom surface and the second bottom surface has a thinner thickness
Data Source
AI summary
Provided are end cover, battery cell, battery, electrical device, and manufacturing method. The end cover is provided with a first recess and a second recess at two sides thereof in its thickness direction, respectively. The first recess has a first bottom surface, and the second recess has a second bottom surface. A pressure relief portion is formed at a portion of the end cover between the first bottom surface and the second bottom surface along the thickness direction. The pressure relief portion has a weakened portion, and the weakened portion is broken when pressure is to be relieved from the battery cell. The end cover is provided with a first recess and a second recess at two sides thereof in the thickness direction, respectively.