Secondary Battery Electrode Terminal Support Structure
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Solution Overview
Problem
The rigidity of conductive tabs and protruding portions in secondary batteries is insufficient, causing the rolled electrode body to swing and making assembly challenging when inserting into a case main body.
Innovation Solution
The use of vertically and horizontally oriented support plates integrated with the electrode terminals to securely support the rolled electrode body from above and below, preventing swinging and ensuring smooth insertion by distributing the weight evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If tabs or protruding portions are used to connect electrode terminals to the rolled electrode body, then the electrode terminals can be provided on the case cover, but the rigidity is insufficient causing the rolled electrode body to swing during assembly
Solution Approach 1:
The electrode terminal is divided into two separate terminals: a first electrode terminal connected to the upper end of the rolled electrode body and a second electrode terminal connected to the lower end. This segmentation allows each terminal to independently support one end of the rolled electrode body, preventing swinging during assembly while maintaining ease of assembly.
Solution Approach 2:
The support structure transitions from a single-plane tab connection to a three-dimensional arrangement where electrode terminals extend vertically from the case cover to engage with both upper and lower ends of the rolled electrode body, adding vertical dimensionality to the support mechanism.
2Device complexity
If the rolled electrode body is inserted hanging from the case cover, then assembly is simplified, but the rolled electrode body swings when hitting the case main body edge
Solution Approach 1:
The first and second electrode terminals are pre-positioned on the case cover before inserting the rolled electrode body. These terminals are ready to engage with the upper and lower ends of the rolled electrode body, providing preliminary support that prevents swinging during the insertion process.
Solution Approach 2:
The mechanical state of the rolled electrode body changes from an unsupported hanging state to a doubly-supported stable state through engagement with the electrode terminals. The support points are positioned at both ends of the rolled electrode body, fundamentally changing its stability parameters during assembly.
Data Source
AI summary
A secondary battery includes a rolled electrode body, a case main body that has a shape of an open cylinder with a bottom; a case cover, a first electrode terminal, and a second electrode terminal. The first electrode terminal and the second electrode terminal support the rolled electrode body. The first electrode terminal is fixed to the case cover, with one end being exposed to the outside of the case main body, and the other end being connected to a first collector portion. The second electrode terminal is fixed, together with the negative-electrode electrode terminal, to the case cover, with one end being exposed to the outside of the case main body, and the other end being connected to a second collector portion.