Cylindrical Battery Collector Welding Through External Access

Solution Overview

Problem

The existing methods for producing lithium-ion cylindrical batteries face challenges in achieving high production speed while maintaining quality, due to difficulties in welding the electrical collector to the container, which requires high precision and is prone to metal debris contamination and slow quality control.

Innovation Solution

A method that involves providing an electrochemical cell with an electrical collector, inserting it into a container with a temporary access point from the outside, and welding the electrical collector to an outer body or rivet from the outside, allowing for faster production and reduced contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If welding is performed through the central hole of the electrochemical cell, then the electrical collector can be connected to the rivet, but the production speed is slow and metal debris contamination occurs

Engineering Contradiction:

Improvewelding qualityVSAvoidproduction speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Instead of welding through the central hole of the electrochemical cell from the inside, the patent inverts the approach by providing access to the electrical collector from the outside of the container through a hole in the container wall, allowing welding to be performed from the outside. This reversal of the welding direction eliminates metal debris contamination and enables faster production while maintaining welding quality.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If welding is performed through the central hole of the electrochemical cell, then the electrical collector can be connected to the rivet, but metal debris contaminates the electrochemical cell

Engineering Contradiction:

Improvewelding qualityVSAvoidmetal debris contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of welding through the central hole of the electrochemical cell from the inside, the patent inverts the approach by providing access to the electrical collector from the outside of the container through a hole in the container wall, allowing welding to be performed from the outside. This reversal of the welding direction eliminates metal debris contamination and enables faster production while maintaining welding quality.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If the electrochemical cell is inserted into the container before welding, then the assembly is complete, but access for welding is difficult and precision is reduced

Engineering Contradiction:

Improveassembly completenessVSAvoidwelding precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent segments the manufacturing process into distinct stages: first inserting the electrochemical cell into the container, then providing a separate access hole in the container wall for welding the electrical collector to the rivet. This segmentation allows the assembly to be completed while maintaining welding precision through dedicated access pathways.

Inventive Principle:

Principle #1Segmentation

4Reliability

If quality control is performed after welding through the central hole, then the battery is complete, but inspection is difficult and time-consuming

Engineering Contradiction:

Improvebattery qualityVSAvoidquality control time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Instead of welding through the central hole of the electrochemical cell from the inside, the patent inverts the approach by providing access to the electrical collector from the outside of the container through a hole in the container wall, allowing welding to be performed from the outside. This reversal of the welding direction eliminates metal debris contamination and enables faster production while maintaining welding quality.

Inventive Principle:

Principle #13The other way round (Inversion)

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 method enables high-speed production of lithium-ion cylindrical batteries while ensuring high quality by eliminating metal debris contamination and simplifying the welding process, allowing for faster and more efficient quality control.

Implementation Method 1

welding the electrical collector and the outer body to one another at said access in order to establish an electrical connection

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentUS20250141069A1Method to produce a battery for energy storage

Publication Date: 2025.05.01 GD SPA

AI summary

A method to produce an energy storage battery having the steps of: providing an electrochemical cell, which is at least partially complete and is provided with an electrical collector; providing a container having a first wall; placing, on an outer surface of the first wall, an outer body, which constitutes an electrical pole of the battery; and inserting the electrochemical cell into the container bringing the electrical collector close to the first wall; providing the electrical collector with an access from the outside of the container in order to permit a weld between the electrical collector and the outer body in order to establish an electrical connection; welding the electrical collector and the outer body to one another through the aforementioned access in order to establish an electrical connection.