Lithium-ion battery production involves multiple internal structures that become difficult or impossible to observe after the cell has been assembled. Electrode layers, tabs, winding positions, and internal alignment may all affect production consistency, yet many of these features are hidden by the battery casing or pouch material.
For this reason, battery X-ray inspection is increasingly used to evaluate internal battery structures without opening or damaging the finished cell. A suitable battery X-ray inspection machine can convert internal features into measurable image data, helping manufacturers identify alignment deviations, folding abnormalities, and other process variations before cells move further downstream.
However, cylindrical and pouch batteries should not be inspected with the same method. Their structures, handling requirements, and critical measurement points are different. SEAMARK therefore provides battery inspection solutions designed around specific battery formats rather than treating every lithium-ion cell as one standard product.
A cylindrical battery is normally produced by winding positive and negative electrode materials into a compact internal roll. A pouch cell may use a stacked or wound structure enclosed in flexible packaging.
These structural differences change what a lithium-ion battery X-ray inspection system needs to measure.
For cylindrical cells, the inspection focus is commonly placed on the relative position of the positive and negative electrodes near the winding ends. The equipment must capture the internal winding region clearly while the cell is transported through the production line.
For pouch cells, the system may need to evaluate a wider, flatter electrode area. It must also handle flexible battery packaging without creating unstable positioning that affects image measurement.
The inspection recipe should therefore be developed according to:
Battery shape and dimensions
Winding or stacking process
Electrode orientation
Required alignment tolerance
Production-line speed
Loading and unloading method
Reject-handling requirements
Traceability and data-storage needs
A general-purpose X-ray unit may produce an image, but a production-ready battery X-ray system must turn that image into a repeatable measurement.
In cylindrical battery manufacturing, electrode alignment is one of the main internal features that can be evaluated through X-ray imaging. Misalignment may occur because of winding variation, material movement, or changes in assembly positioning.
The inspection process normally captures the battery from a defined orientation and measures the relative position of the positive and negative electrode edges. Instead of relying only on an operator to review an image, automated software can calculate the alignment deviation and compare the result with the approved process limit.
SEAMARK’s XB8100 X-Ray Lithium Battery Inspection Series is designed for automatic online inspection of positive and negative electrode alignment during the production of cylindrical 18650 batteries. The system converts X-ray information into visible image data and supports automatic evaluation within the inspection process.
A cylindrical battery X-ray inspection machine should be evaluated for more than image clarity. Manufacturers should also examine:
Stability of battery positioning
Repeatability of electrode-edge recognition
Measurement consistency between production shifts
Compatibility with different cylindrical cell sizes
Inspection speed at the required line capacity
Automatic OK and NG classification
Reject confirmation and alarm logic
If the battery rotates or shifts during imaging, the measurement result may change even when the internal structure remains the same. Mechanical handling is therefore part of inspection accuracy.
Pouch cells present a different inspection challenge. Their broad electrode structure and flexible packaging require stable support and controlled positioning during imaging.
The purpose of battery X-ray inspection for pouch cells is often to measure the alignment deviation between positive and negative electrodes. The system must identify electrode edges accurately across the target inspection area and determine whether the battery remains within the approved manufacturing limits.
SEAMARK’s XB8200 X-Ray Lithium Battery Inspection Series is mainly used for automatic online inspection of positive and negative alignment in square polymer pouch batteries. According to SEAMARK, the equipment can automatically measure alignment, classify good and defective products, and sort rejected batteries through an automated process.
For pouch-cell production, manufacturers should confirm whether the lithium-ion battery X-ray inspection system can manage:
Different pouch dimensions
Changes in electrode width
Flexible package positioning
Multiple measurement locations
Edge-recognition consistency
Automatic sorting of rejected cells
High-speed material transfer
Recipe changeover between products
A system that performs well on one battery sample may not automatically remain reliable when the product width, electrode contrast, or packaging position changes.
The value of battery X-ray inspection is not limited to identifying one defective cell. Inspection data can also show whether a production process is gradually moving away from its normal condition.
For example, a battery may still fall within the final acceptance limit while its electrode alignment begins moving consistently in one direction. If the factory only records pass-or-fail results, this trend may be missed.
A stronger inspection record should include:
Battery model
Production time
Batch or lot number
Measured alignment value
Inspection image
Equipment recipe
OK or NG result
Reject status
Reinspection result
This creates a traceable connection between the battery, the measurement, and the production condition.
The U.S. Department of Energy has highlighted the role of in-line nondestructive evaluation and quality-control methods in improving electrode manufacturing yield and reducing scrap.
High-volume battery production usually benefits from automatic online inspection because manual loading and image review can become a bottleneck. An online battery X-ray inspection machine can inspect each product according to a predefined recipe and automatically separate abnormal cells.
Offline inspection still has value in:
New battery development
First-article verification
Process troubleshooting
Sample analysis
Inspection-recipe development
Defect confirmation
Laboratory evaluation
SEAMARK also provides broader microfocus X-ray inspection machine options for different electronic and industrial inspection requirements. Its product range includes offline, inline, and specialized battery inspection configurations.
The correct choice depends on whether the factory needs 100% production inspection, engineering analysis, or a combination of both.
Manufacturers should test equipment using their actual batteries rather than relying only on standard demonstration samples.
A practical equipment trial should answer the following questions:
Can the system clearly identify the required electrode edges?
Are measurement results repeatable across multiple scans?
Can the equipment maintain accuracy at production speed?
Does the handling system keep each battery in a stable position?
Can recipes be changed efficiently between battery models?
Are defective cells automatically separated and recorded?
Can inspection data be connected with the factory’s traceability system?
SEAMARK can use representative samples to determine suitable imaging parameters, mechanical handling, and inspection logic for different battery structures. This sample-based evaluation is especially important because the performance of lithium-ion battery X-ray inspection depends on the battery material, thickness, dimensions, and target measurement.
Cylindrical and pouch cells require different X-ray inspection strategies. Cylindrical batteries generally require stable orientation and accurate measurement of internal winding alignment, while pouch cells require controlled handling of broad, flexible structures and consistent electrode-edge recognition.
A reliable battery X-ray inspection process should combine image quality, automated measurement, stable material handling, reject control, and traceable production data.
By matching the inspection system to the battery format and target defect, manufacturers can use battery X-ray technology not only to remove abnormal cells but also to identify process trends and improve manufacturing consistency. SEAMARK provides specialized solutions for cylindrical and pouch battery production, helping battery manufacturers build inspection processes around their actual cell structures, production speeds, and quality-control requirements.
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