Secondary Battery Lead Tab Connection Hole Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries face challenges in reducing electric resistance in the charge/discharge path, which affects their efficiency and heat dissipation, particularly due to non-uniform connection pressures and heat distribution.
Innovation Solution
The design includes a lead tab with strategically positioned connection holes and a terminal member integrated with the frame case, ensuring a minimum ratio of connection hole width to overall lead tab width, along with a mechanical connection using a connection member to enhance contact and reduce resistance, and a holder case for uniform pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If connection holes are positioned closer to edges of the lead tab, then manufacturing is easier, but contact pressure becomes non-uniform and electrical resistance increases
Solution Approach 1:
The patent applies local quality by positioning connection holes at specific distances from the edges (12.5%-33.33% of lead tab width), creating non-uniform spacing that optimizes both manufacturing accessibility and electrical connection reliability. This localized optimization ensures uniform contact pressure distribution while maintaining ease of manufacture.
2Reliability
If connection pressure is increased to reduce contact resistance, then electrical resistance decreases, but heat generation increases
Solution Approach 1:
The patent segments the contact interface by introducing multiple connection holes distributed across the lead tab width, transforming a single concentrated contact point into multiple distributed contact zones. This segmentation reduces contact resistance while distributing heat generation across multiple locations, preventing localized overheating.
3Stability of the object's composition
If connection holes are positioned at specific ratios from edges, then contact pressure uniformity improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for connection hole positioning (12.5%-33.33% of lead tab width from edges) that optimize contact pressure uniformity. These parameter specifications provide clear manufacturing guidelines that balance the need for uniform contact pressure with achievable manufacturing precision tolerances.
Data Source
AI summary
A secondary battery including: a battery unit including a battery cell and a lead tab that protrudes from the battery cell; a frame case for supporting the battery unit and including a first support portion for supporting the battery cell and a second support portion for supporting the lead tab; and a connection member for perforating a connection hole formed in the lead tab and extending in a direction of the second support unit, wherein the connection hole of the lead tab includes: a first connection hole that is spaced apart from a first edge of the lead tab by a first width; and a second connection hole that is spaced apart from a second edge of the lead tab by a second width. The secondary battery may reduce electrical resistance of a charge/discharge path and has improved efficiency.