Secondary Battery Electrode Terminal Layout for Impact-Stable Connections
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Solution Overview
Problem
The connection region between the electrode terminal and the electrode assembly in secondary batteries is prone to breakage or disconnection due to impacts, affecting charge and discharge reliability.
Innovation Solution
The electrode terminal is designed with staggered first and second portions, each with connection regions, and a sealing member disposed perpendicular to the electrode assembly, ensuring a minimum distance between edges of these regions to separate tension points, enhancing the connection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single connection region is used between electrode terminal and electrode assembly, then the structure is simple, but the connection is prone to breakage or disconnection under impact
Solution Approach 1:
The electrode terminal is divided into a first portion and a second portion, each with its own connection region (first connection region and second connection region). These connection regions are positioned at different locations along the electrode terminal, so that when impact occurs, the tension regions are separated and not simultaneously affected. This segmentation approach ensures that even if one connection region is compromised, the other remains intact, maintaining electrical connectivity and improving overall connection reliability.
2Reliability
If connection regions are positioned close together, then the electrode terminal length is reduced, but the tension regions overlap and increase disconnection risk
Solution Approach 1:
The first connection region and second connection region are positioned asymmetrically along the electrode terminal in the extension direction. Specifically, the first connection region has a first edge away from the sealing member and a second edge close to the sealing member, while the second connection region has a third edge away from the sealing member and a fourth edge close to the sealing member. The positioning ensures that the tension regions created by these connection regions do not overlap, creating an asymmetric distribution that optimizes both reliability and space utilization.
3Reliability
If the electrode terminal is rigidly connected to electrode assembly, then electrical connection is stable, but impact forces concentrate and cause breakage
Solution Approach 1:
The design inherently provides cushioning against impact forces by distributing the connection points across different locations (first connection region and second connection region). When impact occurs, the separation of tension regions means that the force is not concentrated at a single point but rather distributed across multiple connection points, with some regions experiencing less stress. This beforehand distribution of stress pathways cushions against impact damage and maintains charge and discharge reliability.
Data Source
AI summary
An electrode terminal includes a first portion and a second portion arranged in a first direction. The first and second portions are connected to the electrode assembly and have, respectively, a first connection region and a second connection region. The sealing member is connected to the electrode terminal and disposed on one side of the electrode assembly in a second direction perpendicular to the first direction. In an extension direction of the electrode terminal, the first connection region has a first edge away from the sealing member and a second edge close to the sealing member, and the second connection region has a third edge away from the sealing member and a fourth edge close to the sealing member. A minimum distance between the first and third edges is D1, a minimum distance between the second and fourth edges is D2, and D1 and/or D2 is greater than 0.