Continuous Electrode Lamination for Low-Resistance Lithium Battery Production

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Solution Overview

Problem

Current lithium battery production processes face inefficiencies in both winding and laminated types, leading to high internal resistance and low production efficiency, particularly in the production of small-sized and square batteries.

Innovation Solution

A continuous production process involving pre-compounding, winding for lamination, cutting, reclaiming material, and assembling finished products, utilizing a lithium battery production equipment with a lead-in roller, prism, pressing assembly, cutting assembly, and reclaiming assembly to form a battery strip assembly that is continuously processed and assembled.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If winding type production process is used to fix the central core and wind the electrodes and separator together, then cylindrical batteries can be produced, but the internal resistance of the core becomes highly increased and it is only suitable for small-sized battery models

Engineering Contradiction:

Improvebattery model size adaptabilityVSAvoidcore internal resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent inverts the traditional winding sequence by first forming the battery assembly with electrodes and separator, then wrapping the protective film around the assembled unit rather than winding from a central core. This reversal eliminates the core internal resistance issue while maintaining cylindrical battery production capability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The production process is segmented into distinct stages: electrode preparation, assembly winding, protective film wrapping, and sealing. This segmentation allows each stage to be optimized independently, resolving the contradiction between adaptability and core resistance by separating the assembly formation from the protective covering

Inventive Principle:

Principle #1Segmentation

2Shape

If laminated type production process is used to pre-cut the electrodes and separator into pieces and stack them from bottom to top, then square batteries can be produced, but the overall process production efficiency becomes low due to periodic pauses during the laminating mechanism operation

Engineering Contradiction:

Improvebattery shapeVSAvoidproduction efficiency

Core Design Contradiction:

ShapeVSProductivity

Solution Approach 1:

The patent implements continuous laminating mechanism operation without periodic pauses by optimizing the material feeding and stacking process. The useful action of laminating continues uninterrupted, significantly improving production efficiency while maintaining the ability to produce square batteries

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

Electrodes and separators are pre-cut into pieces before the laminating process, allowing the main laminating mechanism to operate continuously without stopping for material preparation. This preliminary action eliminates periodic pauses and maintains high production efficiency

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If traditional production processes are used for both winding and laminated types, then battery assembly can be formed, but the labor intensity is high and continuous production cannot be realized

Engineering Contradiction:

Improvebattery assembly formationVSAvoidcontinuous production capability

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent merges the electrode assembly process with the protective film wrapping process into an integrated production line. The battery assembly formation and protective covering are combined in a single continuous process flow, eliminating the need for separate manual operations and enabling continuous production

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The production equipment is designed to automatically perform assembly, wrapping, and sealing operations without manual intervention. The system serves itself by automatically feeding materials, forming assemblies, and packaging products, thereby reducing labor intensity and enabling continuous production

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12444774B2Lithium battery production process and equipment

Publication Date: 2025.10.14 BEIJING WELION NEW ENERGY TECH CO LTD

AI summary

Disclosed in the invention is a lithium battery production process, which comprises: through sequentially implemented processes of pre-compounding, winding for lamination, cutting, reclaiming material, continuously processing and assembling finished products, each electrode and separator are laminated, processed and formed, and finally assembled into a battery prefabricated product. The lithium battery production process is simple and efficient to implement, and it may realize continuous production of lithium battery products, thereby greatly improving battery production efficiency, and correspondingly simplifying the entire process flow to reduce the labor intensity of the staff. Also disclosed is a lithium battery production equipment for the above lithium battery production process.