Battery Electrode Web Resistance Screening to Cut Scrap Loss
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Solution Overview
Problem
Existing lithium-ion battery cell electrode production processes result in significant material loss due to high internal resistance and contact resistance issues, requiring all electrodes from a batch to be scrapped if measurement values exceed thresholds, leading to inefficient use of materials.
Innovation Solution
Integration of a measuring station with a micro-electrode array and calculation unit into the continuous electrode production process allows for real-time, in-line measurement of specific and contact resistance before the electrode is completed, enabling identification and removal of defective sections while allowing perfect sections to proceed, thereby reducing material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement is performed on finished electrodes after coating batch completion, then quality control is achieved, but all electrodes from the entire batch must be scrapped if one exceeds resistance thresholds
Solution Approach 1:
The measuring station performs resistance measurements on the electrode web immediately after coating, drying, and calendering processes, but before the electrode is cut into individual units. This preliminary measurement allows identification of defective sections while the entire batch is still continuous, enabling selective removal of only the problematic portions rather than scrapping the entire batch.
Solution Approach 2:
The continuous electrode web is treated as a segmented structure where different sections can be independently evaluated and handled. The measuring station divides the batch into measurable sections, and the control system can selectively divert only the defective sections to scrap while allowing good sections to proceed to cutting and packaging.
2Loss of substance
If in-line measurement is implemented before cutting, then defective sections can be identified and removed individually, but process complexity increases
Solution Approach 1:
The measuring station is integrated into the existing continuous production line, merging the measurement function with the coating, drying, and calendering processes. The measurement occurs in-line without requiring separate handling or interruption of the continuous web flow, thus adding minimal complexity while achieving selective quality control.
Solution Approach 2:
The measuring station acts as an intermediary between the coating/calendering processes and the cutting station. It provides resistance measurement data that mediates the decision-making process for quality control, enabling the control system to determine which sections should be diverted to scrap without requiring complex real-time adjustments to the coating or calendering processes themselves.
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 approach significantly reduces material waste by allowing only defective electrode sections to be sent to scrap, while maintaining the quality of battery cell production by ensuring only properly tested electrodes are used, thus optimizing the production process.
Implementation Method 1
a measuring station with a measuring device is integrated into the process arrangement, in which the specific resistance of an active material layer and/or the contact resistance of the active material layer to the conductor foil
Data Source
Figure 1
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AI summary
The invention relates to a process arrangement for manufacturing an electrode for a battery cell, in which a conductive foil (1) can be continuously guided through processing stations as an endless web, forming an electrode web (E) which is detached and/or cut to size at a final cutting station. According to the invention, the process arrangement includes a measuring station (M) with at least one measuring device (4) in which the specific resistance (ρ) of an active material layer (3) and/or the contact resistance (Ω) of the active material layer (3) to the conductive foil (1), or a corresponding value, can be measured.