Battery Cell End Cover Reinforcement Against Premature Vent Actuation
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Solution Overview
Problem
Battery cells face safety concerns due to premature actuation of pressure relief mechanisms during normal use, leading to potential explosions and fires, primarily caused by internal pressure and temperature increases from thermal runaway.
Innovation Solution
An end cover assembly with a pressure relief through hole and a reinforcing mechanism that enhances the strength of the end cover, preventing creep deformation and ensuring the pressure relief mechanism is only actuated when internal pressure reaches a threshold, thereby improving safety and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end cover is made with a pressure relief through hole and pressure relief mechanism, then the battery cell safety is improved by enabling pressure release, but the end cover strength is reduced making it prone to creep deformation
Solution Approach 1:
The end cover is divided into functional zones: a pressure relief zone with the through hole and mechanism, and a reinforcing zone with the mechanism positioned to strengthen the cover. This segmentation allows the cover to have both pressure relief capability and structural strength in different areas.
Solution Approach 2:
The reinforcing mechanism is positioned in the thickness direction (Z-axis) of the end cover, extending beyond the plane of the cover to provide three-dimensional reinforcement. This dimensional approach allows the mechanism to strengthen the cover without interfering with the pressure relief function in the plane of the cover.
Data Source
AI summary
Provided are an end cover assembly, a battery cell, a battery, and an electrical apparatus. The end cover assembly is for a battery cell and comprises: an end cover provided with a pressure relief through hole; a pressure relief mechanism connected to the end cover and covering the pressure relief through hole, and configured to be actuated to release the pressure inside the battery cell when the pressure reaches a threshold; and a reinforcing mechanism, located on a side of the end cover facing away from an electrode assembly of the battery cell, and covering at least a part of the pressure relief through hole. The reinforcing mechanism is at least connected to a portion of the end cover at two sides of the pressure relief through hole along a first direction to enhance the strength of the end cover at the pressure relief through hole.