Battery Cell Terminal Structure to Prevent Pull-Out Separation
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Solution Overview
Problem
The service life of current batteries is relatively short due to the easy separation of electrode terminals under external forces, leading to damage and reduced lifespan.
Innovation Solution
The battery cell design includes a first terminal portion and a second terminal portion made of different materials, with a first limit part to restrict the first terminal portion from detaching from the lead out hole, and a sealing member to prevent electrolyte ingress and corrosion, enhancing the composite interface stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode terminal uses a simple single-material structure, then the manufacturing process is simple, but the terminal portion easily separates under external forces reducing service life
Solution Approach 1:
The electrode terminal is divided into a first terminal portion and a second terminal portion made of different materials. The first terminal portion (aluminum or aluminum alloy) is configured to be in contact with the busbar component, while the second terminal portion (copper or copper alloy) is configured to be in contact with the electrode assembly. This segmentation allows each portion to be optimized for its specific function and contact interface, preventing easy separation under external forces while maintaining manufacturing feasibility.
Solution Approach 2:
The electrode terminal employs a composite structure combining aluminum/aluminum alloy (first terminal portion) and copper/copper alloy (second terminal portion). This composite material approach leverages the advantages of both materials: aluminum provides good corrosion resistance and compatibility with busbar components, while copper provides excellent electrical conductivity and compatibility with electrode assemblies. The different materials are firmly connected to prevent separation, thereby extending service life.
2Ease of operation
If the first terminal portion is allowed to move freely through the lead out hole, then the assembly process is easy, but the terminal portion can detach under outward pulling forces
Solution Approach 1:
The first terminal portion is preliminarily configured with a specific geometric structure that includes a first limit part and a second limit part. These limit parts are positioned to abut against the inner wall of the lead out hole, creating a preliminary mechanical constraint that prevents outward detachment. This preliminary structural design ensures that during assembly and operation, the terminal portion remains stable while still allowing for straightforward insertion through the lead out hole.
Data Source
AI summary
Provided are battery cell, battery, and electric device. The battery cell includes housing, electrode assembly, and electrode terminal, wherein the housing has wall portion, which is provided with lead-out hole; the electrode assembly is accommodated in the housing; the electrode terminal includes first terminal portion and second terminal portion, which are made of different materials and compounded with each other; the first terminal portion passes through the lead-out hole, and the second terminal portion is electrically connected to the electrode assembly; the first terminal portion includes first limiting portion, and in the thickness direction of wall portion, the first limiting portion limits the first terminal portion from being separated from the lead-out hole in direction away from the electrode assembly; and when the first terminal portion is subjected to outward pulling force, the first limiting portion limits the electrode terminal from being separated from the lead-out hole.