Cylindrical Cell Beading Groove for Jelly Roll Stability

Solution Overview

Problem

The existing manufacturing processes for cylindrical secondary cells are inefficient due to the need for multiple steps and components to secure the jelly roll and electrode lead plate, which complicates assembly and may compromise electrical contact and stability.

Innovation Solution

A cylindrical secondary cell design featuring a beading groove in the can that secures the electrode lead plate between the jelly roll and the groove, minimizing assembly steps and ensuring good electrical contact through a flange deformation, which also prevents the jelly roll from moving, using materials like copper or stainless steel for the electrode lead plate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If multiple components and steps are used to secure the jelly roll and electrode lead plate, then the assembly is more stable, but the manufacturing process becomes more complex and time-consuming

Engineering Contradiction:

Improveassembly stabilityVSAvoidassembly complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent combines the functions of securing the electrode lead plate and the jelly roll into a single beading operation. The bead simultaneously deforms the flange of the electrode lead plate to secure it against the can wall and creates a stop that prevents jelly roll movement, eliminating the need for separate securing components and steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The bead serves multiple functions: it secures the electrode lead plate by deforming its flange, prevents jelly roll movement by creating a stop, and provides structural support within the can. This multi-functional element replaces what would traditionally require multiple separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Stability of the object's composition

If multiple components and steps are used to secure the jelly roll and electrode lead plate, then the assembly is more stable, but the production time increases

Engineering Contradiction:

Improveassembly stabilityVSAvoidproduction speed

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent combines the functions of securing the electrode lead plate and the jelly roll into a single beading operation. The bead simultaneously deforms the flange of the electrode lead plate to secure it against the can wall and creates a stop that prevents jelly roll movement, eliminating the need for separate securing components and steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The beading operation is performed as one of the final assembly steps, where the can is deformed to simultaneously secure both the electrode lead plate and jelly roll in their final positions. This preliminary securing action ensures stability before the cell is sealed and put into service.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If additional components are used to secure the electrode lead plate, then the electrical contact is more reliable, but the number of parts increases

Engineering Contradiction:

Improveelectrical contact reliabilityVSAvoidnumber of parts

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent combines the functions of securing the electrode lead plate and the jelly roll into a single beading operation. The bead simultaneously deforms the flange of the electrode lead plate to secure it against the can wall and creates a stop that prevents jelly roll movement, eliminating the need for separate securing components and steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The electrode lead plate's own flange is deformed by the bead to create the securing mechanism. The flange itself becomes the element that is deformed to achieve retention, eliminating the need for separate clips, retainers, or other additional components.

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design simplifies the assembly process by minimizing components and steps, ensuring secure and stable electrical contact, and allowing for flexible terminal arrangements, while maintaining safety and efficiency in the production of rechargeable batteries.

Implementation Method 1

the flange of the electrode lead plate is bent and pressed inwards, towards a centre of the cylindrical can, by the beading groove

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Implementation Method 2

an electrode lead plate which is electrically conductive and arranged at the first end side of the jelly roll and in direct contact with at least part of the portion free of first electrode coating of the first conductive sheet

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11670815B2Cylindrical secondary cell

Publication Date: 2023.06.06 NORTHVOLT AB

AI summary

The disclosure provides a cylindrical secondary cell (1) and a method of its assembly. The cylindrical secondary cell (1) comprises a cylindrical can (2) comprising a beading groove (3), a first conductive sheet (4), with first electrode coating (4a), wound to form a jelly roll (5), the first conductive sheet (4) comprises a portion free of first electrode coating (4a) protruding on a first end side (5a), and an electrode lead plate (6) arranged at the first end side (5a) and in direct contact with the portion free of first electrode coating (4a). The electrode lead plate (6) comprises a flange (6a) extending away from the jelly roll (5) and arranged along the edge of the electrode lead plate (6). The beading groove (3) is arranged on the cylindrical can (2) such that the flange of the electrode lead plate (6) is bent and pressed inwards, towards a centre of the cylindrical can (2), by the beading groove (3).