Battery Cell Terminal Structure for Side-Tab Connection Stability
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Solution Overview
Problem
Existing battery cell structures do not effectively enhance energy density due to limitations in the connection of the tab to the electrode terminal, which occupies unnecessary space and affects stability.
Innovation Solution
The tab is connected to the side surface of the electrode terminal, reducing the distance between the electrode terminal's bottom surface and the main body, and incorporating a protrusion on the electrode terminal to increase connection area and stability, while maintaining insulation and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tab is directly connected to the bottom surface of the electrode terminal, then the connection stability is improved, but the distance between the bottom surface and the main body increases, reducing the energy density
Solution Approach 1:
The patent changes the connection dimension from vertical (bottom surface connection) to lateral (side surface connection). The tab is connected to the side surface of the electrode terminal rather than the bottom surface, which reduces the distance between the bottom surface and the main body, thereby increasing energy density while maintaining connection stability through the side surface attachment.
2Volume of moving object
If the adapter is omitted to increase energy density, then the space utilization is improved, but the connection stability between tab and electrode terminal deteriorates
Solution Approach 1:
The electrode terminal is segmented into a body portion and a connection portion with protrusions. The protrusions provide dedicated connection points on the side surface for the tab, separating the electrical connection function from the structural support function. This segmentation maintains connection stability without requiring the adapter, thus preserving energy density.
3Reliability
If the protrusion is provided on the electrode terminal to increase connection area, then the connection stability is improved, but the space occupation increases, reducing energy density
Solution Approach 1:
The protrusions are provided locally at the connection region of the electrode terminal rather than throughout the entire structure. This localized addition increases the connection area and stability only where needed, while minimizing the overall space occupation, thus maintaining high energy density.
Data Source
AI summary
A battery cell includes a housing, an electrode assembly, and an electrode terminal, where the housing includes a first wall; the electrode assembly is disposed in the housing, and the electrode assembly includes a main body and a tab connected to the main body; the electrode terminal is disposed on the first wall; the electrode terminal includes a bottom surface and a side surface connected to the bottom surface; the bottom surface faces the main body; and the side surface is connected to the tab.