Cylindrical Battery Current Collecting Lead Deformation Control
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Solution Overview
Problem
Cylindrical alkaline secondary batteries face challenges in achieving high-rate discharge characteristics due to high internal resistance, which can lead to internal short circuits when compressive stress is applied during assembly.
Innovation Solution
A cylindrical alkaline secondary battery design featuring a current collecting lead with a deformation resistance lower than the current collector, where the lead is made of pure Ni and the collector is Ni-plated steel, with a thicker and harder material to prevent deformation and reduce internal resistance, and includes deformation promoting portions to facilitate stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collecting lead has low deformation resistance to prevent internal short circuits, then reliability is improved, but the lead may deform excessively under compression
Solution Approach 1:
The patent establishes a specific parameter relationship where the deformation resistance A of the lead material is less than the deformation resistance B of the current collector material (A<B). This controlled parameter difference allows the lead to deform preferentially under compressive stress, absorbing stress to prevent internal short circuits while the harder current collector maintains structural stability and prevents excessive lead deformation
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A nickel-hydrogen secondary battery (1) includes: an outer can (2); a sealing body (14) including a positive electrode terminal (22), the sealing body (14) sealing an opening of the outer can (2); an electrode group (4) formed by placing a positive electrode (6) and a negative electrode (8) on top of each other with a separator (10) therebetween and spirally winding the positive electrode (6) and the negative electrode (8), the electrode group (4) housed in the outer can (2) along with an alkaline electrolyte; a positive electrode current collector (28) connected to positive electrode connection edge portion (32) protruding from one end surface of the electrode group (4); and a current collecting lead (34) connecting the positive electrode current collector (28) and the sealing body (14), wherein a relationship between a deformation resistance A of a material a and a deformation resistance B of a material b satisfies a relationship of A<B, wherein the material a is a material of the current collecting lead (34), and the material b is a material of the positive electrode current collector (28).