Breakthrough in Ultra-Small Diameter Design: YMIN’s SLX Series Hybrid Supercapacitors Offer a Low TCO Solution for Elongated Devices in Europe and America: Fast Charging + Long Lifespan + Battery Regulation-Free Design

Introduction: The “Heart” Dilemma of Elongated Devices – An “Ultra-Small Diameter” Solution

In the European and American markets, devices such as electronic pens, thermometer probes, and electronic price tags are evolving towards being “thinner, longer, and more portable.” However, energy storage devices have become a design bottleneck – traditional batteries are either too thick, causing the overall device diameter to exceed standards, or have too short a lifespan, leading to frequent after-sales service. Even more problematic is the EU’s new battery regulations (EU 2023/1542), which have caused compliance costs for battery exports to skyrocket and certification cycles to lengthen.

Shanghai YMIN Electronics has launched the SLX series hybrid supercapacitors, with an ultra-small diameter as low as Φ3.55mm as its core breakthrough (typical models include Φ4×25mm, Φ3.55×7mm, and Φ6.3×38mm), combining fast charging friendliness, long cycle life, low maintenance, safety and environmental friendliness, and ease of export transportation. The SLX series helps European and American customers circumvent battery regulatory barriers, allowing them to focus on product innovation.

I. Ultra-small diameter (Φ3.55–6.3mm) – Designed for confined spaces

For devices like electronic pen barrels and thermometer probes, every 1mm increase in diameter either compromises the grip or makes them impossible to fit. The SLX series achieves the industry’s smallest diameter at Φ3.55mm. The typical model, SLX 3.8V 10F (Φ4×25mm), has a diameter strictly controlled to within 4mm, allowing it to be directly embedded in spaces the size of a ballpoint pen refill.

[Figure 1: Comparison of SLX 3.8V 10F (Φ4×25mm) product diameter with stacked 1-yuan coins]

Even more extreme is the SLX 3.8V 1.5F (Φ3.55×7mm), currently the smallest in the industry, suitable for ultra-miniature sensors. The SLX 3.8V 70F (Φ6.3×38mm), with its slender shape, is suitable for handheld devices such as remote controls.

II. Core Technology Unveiled – Three Processes Achieve “Small Diameter, Large Capacity”

The SLX series‘ ability to compress the diameter to 4mm and below is not simply a matter of “making it smaller,” but stems from a systemic technological breakthrough:

1. Hybrid Lithium-ion Capacitor Technology

Utilizing a hybrid technology route of “high specific surface area activated carbon + pre-lithiated anode.” Compared to traditional EDLCs that rely solely on physical adsorption for energy storage, SLX introduces a lithium-ion insertion/extraction mechanism, significantly increasing energy density within the same volume—this is the technological foundation for achieving a 10F capacity with a diameter of only 4×25mm.

2. Ultra-thin Electrode Coating Process + High-Density Winding Structure

Through an ultra-thin electrode coating process, active materials are uniformly coated to an extremely thin thickness. Combined with a high-density winding structure, the effective electrode area is maximized within a limited diameter. This is the key technological guarantee for achieving “small diameter, large capacity.”

3. Patented Electrode Design + Ultra-miniature Packaging Process

The patented electrode design optimizes the internal space layout. Combined with an ultra-miniature packaging process, it significantly improves space utilization, ultimately achieving the industry’s smallest diameter—Φ4×25mm—and an even more extreme Φ3.55×7mm.

[Figure 2: Parameter Comparison Table with Nichicon (4*25mm)]

III. Performance, Lifespan, Safety, and Compliance – Four Dimensions Building Core Competitiveness

Dimension 1: Fast Charging Friendly – ​​15-30 Second Full Charge, Say Goodbye to Waiting

Traditional lithium titanate batteries require 2-4 hours to charge, while the SLX series only takes 15-30 seconds.

In electronic pen applications, customers actually use a 150mA charging current and a 4.2V charging voltage, meeting the requirements of approximately 10mA operating power consumption and a minimum 2.5V operating voltage. Users can simply place the pen on the charging dock and continue using it after a few seconds – this upgraded experience is a direct benefit of fast charging friendliness.

Dimension 2: Long Cycle Life = Low Maintenance, Significantly Reduced TCO

The SLX series has a cycle life exceeding 100,000 cycles, dozens of times that of ordinary lithium batteries (thousands of cycles).

Under the harsh conditions of simulating a barbecue probe charging and discharging 10 times daily, the SLX’s performance degradation is less than 20% after 2 years of operation (far exceeding the 1-year product warranty period), with an expected lifespan exceeding 5 years. This means that users almost never need to replace energy storage devices during the product’s lifecycle, and brands also greatly reduce the burden of after-sales out-of-warranty replacements.

[Figure 3: SLX Ultra-Small Diameter Hybrid Supercapacitor: Diameter-Capacity and Cycle Life Characteristics]

Dimension Three: Reliability and Safety – Wide Temperature Range of -20℃ to 85℃, Zero Risk of Thermal Runaway

For energy storage devices embedded in narrow spaces and potentially exposed to vibration, drops, high temperatures, or export transportation, reliability and safety are paramount. The SLX series delivers a complete answer in this regard:

Dimension Four: Facilitating Export Transportation – Bypassing Battery Regulations and Simplifying Certification Processes

For equipment manufacturers exporting to Europe and the United States, battery compliance is a significant hurdle. The new EU battery regulation (EU 2023/1542) imposes stringent requirements on carbon footprint, recycling rates, and labeling, leading to lengthened certification cycles and soaring compliance costs for traditional battery exports.

The SLX series is classified as a capacitor and is not subject to this regulation. It has obtained the following certifications:

Safety Certifications: UL810A, UN38.3 (Aerospace Transport Safety)
Environmental Certifications: RoHS, REACH
System Certifications: ISO 14001, IATF16949

Actual Customer Benefits:

Certification cycle shortened by more than 50%

Compliance costs reduced by more than 60%

IV. Real-world Application Scenarios – The Value SLX Creates for Customers

Case Study 1: Active Electronic Pen

[Figure 4: Embedded Application of SLX in Electronic Pens]

Case 2: Bluetooth Probe Thermometer (e.g., Barbecue Thermometer)

[Figure 5: Schematic diagram of the internal structure of the SLX in a Bluetooth barbecue thermometer]

V. Value Anchoring Beyond Price: YMIN’s TCO Advantage and Supply Chain Security

We anchor ourselves to the performance baseline of Japanese products while offering a more advantageous TCO value.

While YMIN may not offer the lowest price, it systematically helps customers avoid:

Returns and After-Sales Claims—mass customer complaints and brand damage due to insufficient component lifespan;

Project Delay Costs—development and launch losses due to certification obstacles or unstable supply;

Single Supplier Dependence Risk—meeting the stringent requirement for backup sources and improving overall supply chain security.

Choosing YMIN SLX means you gain more than just a capacitor; you gain long-term system reliability, operational stability, predictable low maintenance costs, and a reliable second source of supply.

VI. YMIN Electronics Provides Full Support

As a professional original equipment manufacturer (OEM) of capacitors, YMIN not only provides high-performance products but also offers comprehensive technical services throughout the entire process:

Selection Support: Covering multiple slim models from 1.5F to 70F

Verification Support: Simulating customer operating conditions for lifespan and performance testing

Sample Request: Rapid response to accelerate your product launch

Conclusion

Starting with ultra-small diameters, the SLX series solves the entire chain problem of “fitting, charging quickly, lasting long, and transporting” for devices in confined spaces. Whether it’s upgrading the feel of electronic pens or achieving compliance breakthroughs for exported sensors, the YMIN SLX is a reliable choice.