Cylindrical Battery Electrode Assembly for Faster Large-Diameter Winding

Solution Overview

Problem

Conventional cylindrical secondary batteries face challenges with large-diameter electrode assemblies, requiring long electrode plates that increase winding time and reduce productivity due to extended lengths, necessitating increased space and labor for winding facilities.

Innovation Solution

The electrode assembly is formed by stacking and winding multiple stacks of positive and negative electrode plates with separators, reducing the length of each plate and improving winding efficiency, thereby maintaining productivity and enhancing electrolyte impregnation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a single stack with long electrode plates is used to form large-diameter electrode assemblies, then the battery capacity and diameter requirements are met, but the winding time increases and productivity decreases

Engineering Contradiction:

Improvewinding speedVSAvoidelectrode plate length

Core Design Contradiction:

ProductivityVSLength of moving object

Solution Approach 1:

The electrode assembly is divided into multiple stacks, each containing shorter electrode plates. Instead of using one long electrode plate for the entire large-diameter assembly, the patent segments the assembly into multiple manageable stacks that can be wound independently and then assembled together, directly reducing the length of individual electrode plates and increasing winding speed

Inventive Principle:

Principle #1Segmentation

2Loss of time

If electrode plate length is reduced by using multiple stacks, then winding time decreases and productivity increases, but the structure becomes more complex

Engineering Contradiction:

Improvewinding timeVSAvoidstack structure

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The electrode assembly is divided into multiple stacks, each containing shorter electrode plates. Instead of using one long electrode plate for the entire large-diameter assembly, the patent segments the assembly into multiple manageable stacks that can be wound independently and then assembled together, directly reducing the length of individual electrode plates and increasing winding speed

Inventive Principle:

Principle #1Segmentation

3Productivity

If multiple stacks are wound to form the electrode assembly, then electrode plate length is reduced and winding efficiency improves, but the number of components increases

Engineering Contradiction:

Improvewinding efficiencyVSAvoidnumber of electrode plates

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

Multiple stacks containing shorter electrode plates are combined and assembled together to form the complete large-diameter electrode assembly. The stacks are merged in a way that achieves the required total capacity and diameter while maintaining winding efficiency, balancing the increase in component quantity with improved manufacturing productivity

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250316772A1Cylindrical secondary battery

Publication Date: 2025.10.09 SAMSUNG SDI CO LTD

AI summary

A cylindrical secondary battery includes: a cylindrically wound electrode assembly including a plurality of positive electrode plates, a plurality of negative electrode plates, and a plurality of separators insulating the positive electrode plates and the negative electrode plates from each other; a can accommodating the electrode assembly; and a cap plate coupled to an open end of the can and sealing the can.