Quality Control - Qixin Advanced Power Source Materiais Co.,Ltd

Quality control

Quality section

The company is deeply involved in the field of battery manufacturing and has established a comprehensive quality control system throughout the entire process. Strictly inspect raw materials upon arrival at the factory to prevent the production of unqualified materials; Standardized control of production processes, setting detection nodes for key processes, and real-time monitoring of production indicators; The finished product has undergone multiple performance and safety tests, and hidden dangers have been identified layer by layer. Information retention and full traceability of each production process. The enterprise adheres to rigorous quality standards, refines various control standards, and relies on normalized quality supervision to ensure that every battery delivered has stable performance, safety, and reliability.

Standardized production process

Mixed paste

1.The ingredients and weight are verified at three levels to ensure the accuracy of the materials in each can;

2.The "6S" principles are applied to every corner and tool on-site, with responsibilities assigned to specific individuals to prevent the introduction of impurities at the source.

3.The process involves careful control of parameters such as the sequence of each step, stirring speed, time, and temperature to ensure consistency in each batch.

Coating

1.Slot-extrusion coater, stable equipment ensures consistent coating;

2.Clean or reground the coating roller thoroughly at least once a month, and conduct levelness and parallelism tests on the coating roller to ensure equipment stability;

3.Check and clean the coating roller, oven, and transmission parts every shift to avoid dust contamination.

Roller pressing

1.Regularly check the parallelism between the two rollers and the circumference of the rollers, and grind the rollers regularly to ensure the consistency of the electrode sheet thickness.

2.Check and clean the roller surface and transmission parts every shift to avoid dust contamination.

Slitting

1.Continuous automatic slitting machines better ensure the consistency of electrode sheets and reduce damage to them;

2.Strict burr inspection;

3.Check the slitting blade daily and sharpen it regularly.

4.Each shift checks the tension system to ensure consistent tension and minimal waviness in each roll;

5.Clean the dust extraction and transmission parts every shift to reduce dust contamination of the electrodes.

Electrode sheet manufacturing

1.The automatic electrode making machine completes electrode tab welding and high-temperature tape application in one go, avoiding damage and contamination to the electrode sheets caused by human contact, and ensuring good electrode sheet consistency.

2.Regularly check the welding effect of the electrode tabs and the position of the high-temperature tape.

3.The welding effect is inspected every 700 pieces produced.

Winding process

1.Automatic winding machine.

2.Automatic winding ensures uniform tension and precise electrode alignment.

3.Ensure the structural consistency of each battery cell.

Spot welding

1.Automatic bottom spot welding of negative electrode tab.

2.100% testing of welding parameters.

3.Automatic rejection of defective products.

Grooving

1.After groove rolling, dimensional inspection is carried out.

2.Multiple inspections and process records are conducted to ensure the dimensions of the grooves.

Laser welding

1.Weld appearance inspection

2.Weld tensile strength testing

3.Multiple inspections to ensure welding quality.

Battery Electrolyte Injection

1.From the completion of cell baking to battery sealing, the entire process is carried out inside a glove box, with relative humidity strictly controlled below 1% to minimize the impact of moisture on cell performance.

2.Each tray is independently tested for electrolyte volume to ensure accurate and consistent electrolyte addition.

Formation、Grading

High-precision batching and capacity testing equipment monitors the entire charging and discharging process of each battery in real time, accurately selects and matches them, and ensures that the battery cells leaving the factory have consistent performance and reliable quality.

Aging

Let the batteries sit at room temperature for 14 days to ensure consistency in battery sorting.

Standardized production process

Incoming material inspection

Prefer listed company suppliers.

We conduct rigorous batch-by-batch inspections of incoming materials to ensure product consistency and reliability from the source.

Coating thickness test

Each batch of incoming materials is inspected for the coating thickness at different locations on the steel shell (top, middle, bottom, and bottom) and the coating thickness on the cap, serving as the first line of defense against battery rust.

Salt spray test

Each batch of incoming materials is inspected for the uniformity and density of the coating on the steel casing and cap to prevent rust spots from appearing on the batteries during use and storage in harsh environments.

Cap pressure safety test

Each batch of incoming materials is tested for the opening pressure and explosion-proof pressure of the battery cap to improve battery safety while ensuring consistency and stability.

Slurry testing

Viscosity test: to ensure consistency in the quality of each batch of slurry.

Three-level verification of ingredients and weight: to ensure the accuracy of the ingredients and weight of each batch of slurry.

Coating moisture detection

Sampling, weighing, and moisture testing: The moisture content of the coating after drying is continuously tested for the first piece and for each roll to ensure the consistency of the electrode sheets after drying.

Coating surface density X-ray online monitoring

Online X-ray monitoring of coating surface density;

Areal density was continuously measured during the coating process for each roll.

Ensure real-time control.

Coating surface density X-ray online monitoring

Segmentation and Control

The slitting blade is replaced regularly; The first piece roll are continuously inspected for burrs during the slitting process.

Winding alignment control

X-ray inspection and control of winding alignment: The winding alignment of the core is inspected by X-ray during the first piece and each roll process to ensure that the positive and negative electrodes are properly coated.

Battery core baking control

Battery core baking control: High vacuum ovens are used to bake the cores, and the moisture content of each oven is tested by a Karl Fischer coulometric moisture meter to ensure that only cores with qualified moisture content are used for liquid injection.

Battery electrode inspection

The first piece and 700 pieces per machine are torn apart for inspection to ensure the stability and consistency of the electrode tabs and electrode welding.

Welded cover cap and spot-welded bottom tension detection

For the first piece, each machine must undergo welded cover cap and spot-welded bottom tension testing to ensure the firmness and consistency of the welds.