Battery Lab Q&A VOL.002: Which process steps require thickness measurement in lithium battery R&D and mass production?

Release time:2025-07-22


@Chaodiantech

Battery Lab Q&A vol.002

Common Problems & Solutions in Battery R&D

Lithium Battery R&D and Mass Production

Which process steps

require thickness measurement?



 
 

Thickness measurement in lithium battery R&D and production is a core quality control process throughout the entire process. Its accuracy directly determines the battery's energy density, safety, and consistency.

 

The following is a comparison table of thickness measurement requirements covering the entire lithium battery production and experimental processes, clearly indicating "Must Measure", "Optional Measurement", "No Need to Measure" processes and core reasons.

 

 

 

 

This table streamlines battery process SOP design, covering the key points of thickness measurement throughout the entire experimental and production process , and can be used as a quality control standard for battery production lines or a laboratory operating guide. Whether it's an engineer who has just started working on the production line or a researcher who has just entered the laboratory, they can quickly understand the quality control logic of each link through clear process classification, clear thickness measurement requirements, and core indicators.

 

In the entire process of battery development and mass production, a 1μm difference in wet film thickness during coating may cause a deviation of more than 3% in surface density, directly reducing capacity consistency; a 0.01g/cm³ fluctuation in compaction density after rolling will change the ion diffusion path, reducing cycle life; even a 3μm unevenness in the thickness of the diaphragm coating may become a shortcoming in puncture resistance - these seemingly small deviations are actually key variables that determine battery performance, yield, and safety.

 

 

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