Battery Cell End Cover Assembly for Leak-Resistant Terminal Connection
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Solution Overview
Problem
Battery cells experience electrolyte leakage due to the easy deformation of connecting members, which affects the service life and structural integrity, especially under vibrations and impacts.
Innovation Solution
An end cover assembly with a mating structure between the connecting member and the end cover, providing deformation resistance by mating portions that enhance structural strength and prevent radial deformation, thereby securing the electrode terminal and improving sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the connecting member is made thinner or more flexible to ease installation, then ease of operation is improved, but structural strength deteriorates causing deformation and electrolyte leakage
Solution Approach 1:
The connecting member includes a nested structure where an inner tube is positioned within an outer tube. The inner tube provides flexibility for installation while the outer tube provides structural strength to prevent deformation and electrolyte leakage during operation.
2Reliability
If the connecting member is made more rigid to improve structural strength, then reliability is improved, but ease of operation deteriorates due to difficulty in installation
Solution Approach 1:
The connecting member transitions from a static rigid structure to a dynamic nested structure where the inner tube can move relative to the outer tube. This allows the connecting member to be flexible during installation (inner tube can be inserted) and rigid during operation (inner tube is constrained), resolving the contradiction between reliability and ease of installation.
3Device complexity
If the connecting member structure is simplified to reduce device complexity, then device complexity is reduced, but structural strength deteriorates leading to deformation under vibration and impact
Solution Approach 1:
The connecting member is segmented into distinct functional components (inner tube and outer tube) that can be manufactured separately using standard processes, then assembled together. This segmentation allows each component to be optimized for its specific function while maintaining overall structural strength to resist deformation under vibration and impact.
Data Source
AI summary
An end cover assembly applied to a battery cell includes an end cover provided with an electrode lead-out hole and including a first mating portion provided at a side, facing inside of the battery cell, of the end cover, an electrode terminal disposed at the end cover and covering the electrode lead-out hole, and a connecting member configured to electrically connect the electrode terminal and an electrode assembly of the battery cell. The connecting member includes a second mating portion configured to be mated with the first mating portion to provide deformation resistance of the connecting member along a radial direction of the electrode lead-out hole.