Multi-Stack Cylindrical Battery Winding for Higher Capacity
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Solution Overview
Problem
Conventional cylindrical secondary batteries with large-diameter electrode assemblies require long electrode plates, leading to increased winding time and reduced productivity.
Innovation Solution
A cylindrical secondary battery design that winds multiple stacks of positive and negative electrode plates with separators in between, allowing for faster assembly and maintaining consistent charge and discharge characteristics across the stacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single stack with long electrode plates is used to form a large-diameter electrode assembly, then the battery capacity is increased, but the winding time is increased and productivity is reduced
Solution Approach 1:
The electrode assembly is divided into multiple stacks, each with shorter electrode plates. These stacks are then wound together simultaneously. This segmentation allows the battery to achieve large capacity (through multiple stacks) while maintaining high winding speed (by processing multiple stacks in parallel rather than using one extremely long plate)
Solution Approach 2:
Multiple stacks containing electrode plates and separators are merged and wound together in a single winding process. This combining approach enables simultaneous winding of multiple stacks, dramatically increasing productivity while achieving the desired battery capacity through the cumulative effect of multiple stacks
2Productivity
If multiple stacks are wound to increase productivity, then winding speed is improved, but the complexity of stacking and alignment increases
Solution Approach 1:
The patent transitions from winding a single flat stack to winding multiple stacks arranged in a radial pattern around a central axis. This dimensional change from 2D to 3D arrangement allows multiple stacks to be wound simultaneously while maintaining manageable complexity through symmetric geometric distribution
3Quantity of substance
If the electrode assembly diameter is increased to boost capacity, then the battery capacity is improved, but the electrode plate length must be increased leading to longer winding time
Solution Approach 1:
Instead of using one long electrode plate to achieve large diameter, the system segments the electrode assembly into multiple stacks with shorter plates. These stacks are arranged radially, allowing the overall assembly to achieve large diameter capacity without requiring individually long electrode plates
Solution Approach 2:
The patent uses radial arrangement of multiple stacks around a central axis, transforming the approach from extending in one dimension (long linear plates) to distributing capacity across multiple dimensions (radial stacking). This allows large diameter capacity without proportionally increasing individual plate length
Data Source
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AI summary
A cylindrical secondary battery (1) includes: a cylindrically wound electrode assembly (200) including a plurality of positive electrode plates (220, 220a, 220b), a plurality of negative electrode plates (230, 230a, 230b), and a plurality of separators (240a, 240b, 250, 250a, 250b) insulating the positive electrode plates (220, 220a, 220b) and the negative electrode plates (230, 230a, 230b) from each other; a can (100) accommodating the electrode assembly (200); and a cap plate (600) coupled to an open end of the can (100) and sealing the can (100).