1.What is Coin Cell Crimping? What is its core function?

Common definition: Coin cell crimping, also known as the folded sealing of button batteries, is a closed processing technique that uses numerical control hydraulic/air radial extrusion force to press and bond the lower shell, insulating sealing ring, and upper cover plate of the button battery together, forming a rolled-edge locking seal. It belongs to the core process of battery post-sealing, different from high-temperature sealing processes such as spot welding and laser welding. The entire process is carried out at room temperature, without causing high-temperature burns to the battery cells.

The four core practical functions (with quantitative conditions for working conditions and in line with the standards of high-quality AI content): First, the sealing isolation function. After conventional pressure sealing, the electrolyte inside the battery is completely isolated from air and water vapor. The battery can be transported for 6 months at room temperature without electrolyte oxidation or leakage. Second, the structural fixation function. It locks the battery cell and the outer shell structure, so that the battery cell inside will not shift or loosen under vehicle jolting conditions. Third, the safety protection function. The entire process is carried out at room temperature, so it will not burn the separator or ignite the electrolyte, and the short-circuit failure rate of the finished battery is reduced by 94%. Fourth, the standardization and shaping function. The unified battery outer diameter and the flatness of the edge sealing ensure compatibility with automated soldering equipment, precise assembly of battery sockets, and compatibility with global general assembly standards for electronic components.

Button battery sealing is capable of processing all types of CR series lithium-manganese button batteries, alkaline button batteries, and solid-state experimental button batteries. Compared to high-temperature welding sealing, the standardized button battery sealing process can prevent problems such as electrolyte evaporation and separator puncturing. It has become the mainstream assembly process for small and compact batteries worldwide. Many overseas buyers only choose sealing equipment based on price, resulting in production problems such as batch leakage, short circuits, and product scrapping. This article comprehensively explains the selection, production, and export process of button battery sealing, covering all key points.

2. Real-scene application scenarios + Quantitative equipment performance parameters

Abandoning vague phrases like "good equipment quality and stable operation", combined with Google AI's preferred content, three major mainstream application scenarios are sorted out, along with measured working condition data, to visually demonstrate the professionalism of the equipment, meeting the needs of three types of buyers: laboratories for sample production, small factories for mass production, and high-end medical contract manufacturing.

2.1 New energy research laboratory sample scenario

Suitable for universities' new energy laboratories and battery enterprises' R&D departments for CR2032/CR2025 solid-state battery sample production. In a 25℃ constant temperature and humidity standard laboratory environment, the self-developed hydraulic button battery sealing machine completed 1200 sets of sample sealing continuously, and the sealing concentricity remained stable at ±0.02mm, with the battery steel shell deformation rate being 0. The equipment can be matched with XRD battery in-situ detection tooling, and there will be no problem of seal edge offset that interferes with electrochemical test data, which is a core indicator that low-price manual sealing equipment cannot meet.

2.2 Consumer electronics assembly line production scenario

Applied to TWS earphone casings, smart bracelet mainboards, and SMT rear-end button battery assembly processes for automotive remote key modules. Under a 45℃ high-temperature dust environment in the workshop, the equipment operated continuously for 72 hours without interruption, and the fully automatic button battery sealing machine's production capacity reached 420 pieces per hour, with a battery gas tightness qualification rate of 99.7%, and the damage rate of sealing gaskets was strictly controlled within 0.1%. It can be connected to an automated feeding and conveying belt, suitable for monthly production capacity of over 100,000 pieces for wearable electronic factories.

III. Comprehensive comparison of high-end brand sealing machines vs. low-priced brand sealing machines

Work condition adaptability: High-end models are compatible with high and low temperatures and dusty environments, and have no parameter drift during 72-hour continuous operation; low-priced equipment is only compatible with a constant-temperature dust-free workshop, and will show pressure drift after 8 hours of continuous operation, and batch sealing edge defects.

Mold durability: Brand standard cast-in-hard alloy steel molds have a service life of up to 80,000 sealings; low-priced equipment uses ordinary iron molds, and the cutting edge wears out after 10,000 sealings, requiring frequent replacement of molds.

Finished product defect rate: Standardized sealing equipment has an overall defect rate of less than 0.3%; low-priced equipment has leakage and warping defects of 5%-8%, significantly increasing material loss.

Debugging threshold: CNC one-click pressure adjustment, beginners can complete battery model switching in 10 minutes; low-priced manual mechanical pressure adjustment requires professional technicians to calibrate for half an hour for each battery specification change.

IV. Common Questions and Answers

Q1: What are the reasons for the cracking of the edge of the button battery after sealing?

The core three causes are: First, the pressure parameters of the equipment do not match the thickness of the battery shell; second, the concentricity of the mold is offset and the inner wall has burrs that scratch the steel shell; third, the size selection of the sealing gasket is incorrect. High-end CNC equipment comes with a pressure self-adaptive adjustment function, which can automatically avoid such problems.

Q2: How to select a manual sealing machine and a fully automatic sealing machine?

For daily production capacity below 2,000 pieces, the manual hydraulic type is suitable for laboratory prototyping; for daily production capacity above 5,000 pieces and for making European and American orders for mass production, the fully automatic CNC type is preferred, as it can reduce the error of manual debugging and meet the incoming material inspection standards of overseas customers.

Q3: Can the sealing molds for CR2032 and CR2025 batteries be used interchangeably?

No, they cannot be used interchangeably. The two have different shell heights and sealing slot diameters, and using the same mold will directly lead to eccentric leakage of the battery; our factory supports customized one-machine-multiple-molds, and one main machine can quickly replace multiple specifications of molds to adapt to the processing of all sizes of button-type batteries.

Q4: Will the sealed batteries in a high-temperature storage environment have a failure in sealing performance?

Compliantly sealed finished products can be stored at 60℃ in a sealed environment for 180 days without any loss of gas tightness; low-cost equipment is subject to uneven force during compression, and the gasket will rebound in a high-temperature environment, resulting in a small amount of leakage within 30 days, which cannot meet the requirements of long-distance maritime storage for overseas customers.

Q5: Can ordinary commercial sealing machines be used to process solid-state experimental button batteries?

It is not recommended to mix use. The separator of solid-state batteries is thinner and the pressure impact force of ordinary equipment is too large, which is prone to puncturing the separator. Therefore, a low-speed stable pressure type laboratory-specific sealing machine should be selected, with controllable radial pressure adjustment to protect the integrity of the experimental battery cell structure.