Battery Cell Terminal Structure for Higher Energy Density
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Solution Overview
Problem
Existing battery cell structures do not effectively enhance energy density due to inefficient utilization of internal space and connection stability between the tab and electrode terminal.
Innovation Solution
The tab is connected to the side surface of the electrode terminal, with a protrusion on the electrode terminal to increase connection area and reduce the distance between the electrode terminal and the main body, while maintaining insulation and stability, utilizing the internal space more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tab is directly connected to the bottom surface of the electrode terminal, then the connection is simple, but the distance between the electrode terminal and main body increases, reducing energy density
Solution Approach 1:
The tab connection position is changed from the bottom surface to the side surface of the electrode terminal, utilizing a different spatial dimension. This dimensional shift allows the tab to connect to the electrode terminal while maintaining a smaller distance between the electrode terminal and main body, thereby improving energy density without complicating the connection structure.
2Quantity of substance
If the tab is connected to the side surface of the electrode terminal, then the distance between electrode terminal and main body is reduced, but the connection area decreases, reducing connection stability
Solution Approach 1:
The side surface of the electrode terminal is designed with a localized protrusion structure where the tab connects. This local quality enhancement concentrates the connection area at the protrusion, providing sufficient connection stability and electrical contact while maintaining the overall compact design that improves energy density.
3Reliability
If the protrusion is added to the electrode terminal to increase connection area, then connection stability improves, but the protrusion occupies internal space, reducing energy density
Solution Approach 1:
The protrusion dimensions are optimized with specific parameter ranges: height of 0.1-5mm and diameter of 0.5-3mm. These controlled parameter changes ensure the protrusion provides sufficient connection area for stability while minimizing space occupation, thereby balancing connection reliability and energy density.
Data Source
Figure 1~2
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AI summary
A battery cell (100), a battery (200), and an electric device are provided. The battery cell (100) includes a housing (10), an electrode assembly (20), and an electrode terminal (30), where the housing (10) includes a first wall (110); the electrode assembly (20) is disposed in the housing (10), and the electrode assembly (20) includes a main body (21) and a tab (22) connected to the main body (21); the electrode terminal (30) is disposed on the first wall (110); the electrode terminal (30) includes a bottom surface (301) and a side surface (302) connected to the bottom surface (301); the bottom surface (301) faces the main body (21); and the side surface (302) is connected to the tab (22).