Introduction: Energy Storage Selection for Slim Smart Devices Faces Obstacles; Ultra-Fine Diameter Capacitors Offer a New Solution

In the European and American markets, products such as active styluses, probe thermometers, and electronic shelf labels continue to iterate and upgrade towards slimmer and more portable designs. However, the integration of energy storage components has become a bottleneck in structural design. Traditional lithium batteries are relatively large, easily causing products to exceed outer diameter limits, shortening the overall battery life and increasing weight deviation. Moreover, lithium batteries have short cycle life, resulting in a high frequency of after-sales repairs. Coupled with the implementation of the new EU battery regulation EU 2023/1542, compliance costs for overseas equipment exports have skyrocketed, and certification cycles have been significantly lengthened.


Shanghai YMIN Electronics has independently developed the SLX series of hybrid supercapacitors, featuring an ultra-thin cylindrical diameter of 3.55mm. Mainstream specifications include Φ4×25mm, Φ3.55×7mm, and Φ6.3×38mm. These capacitors boast numerous advantages, including ultra-fast charging, 100,000-cycle lifespan, maintenance-free operation, safety and environmental friendliness, and convenient cross-border transportation. This helps overseas manufacturers circumvent lithium battery compliance barriers and focus on product structure and functional development.

I. Ultra-thin cylindrical diameter (Φ3.55–6.3mm), precisely adapted to narrow and elongated installation spaces

The internal space of the stylus body and temperature probe is extremely limited. Every millimeter increase in the thickness of the energy storage components compromises the product's grip and may even prevent complete internal assembly. The SLX series boasts an industry-leading ultra-small outer diameter of Φ3.55mm. The benchmark model, 3.8V 10F (Φ4×25mm), has an outer diameter strictly controlled within 4mm, requiring an installation space equivalent to the thickness of a ballpoint pen refill.

Also available is the ultra-miniature 3.8V 1.5F (Φ3.55×7mm), suitable for various ultra-small precision sensing devices; and the longer 3.8V 70F (Φ6.3×38mm), suitable for remote control devices, portable handheld terminals, and other products.

II. Three Self-Developed Processes Enable Large-Capacity Energy Storage in a Small Size

The SLX series maintains ample capacity within an extremely small cylinder diameter thanks to three core process breakthroughs, not simply a reduction in product size:

Hybrid Lithium-Based Capacitor Technology

Utilizing a composite solution of high specific surface area activated carbon and a pre-lithiated negative electrode, unlike conventional double-layer capacitors that rely solely on physical adsorption for energy storage, this technology adds a lithium-ion insertion/extraction energy storage path. This significantly improves energy storage capacity within the same volume, and is the core reason why the Φ4×25mm specification can achieve a 10F capacity.

Ultra-Thin Electrode Coating + High-Density Winding Process

The active electrode material undergoes ultra-thin, uniform coating processing, combined with a compact, high-density winding structure. This maximizes the effective energy storage electrode area within the limited cylinder space, achieving the product characteristics of a small outer diameter and high capacity.

Customized Patented Electrodes + Micro-packaging Technology

Leveraging patented electrode arrangement to optimize internal space utilization, coupled with a dedicated micro-sealing process, the product achieves ultra-fine dimensions such as Φ3.55×7mm and Φ4×25mm.

III. Four Major Advantages: Fast Charging, Long Lifespan, High Safety, and Easy Compliance, Building Core Product Competitiveness

Dimension 1: Ultra-fast Charging, 15-30 Minutes? Correction: Fully charged in 15-30 seconds, ready to use anytime.

Traditional lithium titanate batteries require 2-4 hours to fully charge, while the entire SLX product line can be fully charged in just 15 to 30 seconds. Taking the active stylus application as an example, the device uses a 4.2V charging voltage and a 150mA charging current, meeting the device's normal power consumption of 10mA and minimum operating voltage of 2.5V. The product can be charged immediately upon placement, significantly optimizing the end-user experience.

Dimension Two: 100,000 Ultra-Long Cycle Life, Reducing Maintenance Costs and Lowering Overall Lifecycle Costs

The product's cycle life exceeds 100,000 cycles, dozens of times longer than conventional lithium batteries. In a harsh environment with a probe-type thermometer charging and discharging 10 times daily, the capacity decayed by less than 20% after two years of continuous use, with an estimated actual lifespan of up to 5 years, far exceeding the one-year warranty period. This significantly reduces after-sales replacement and repair costs for equipment manufacturers.

Dimension Three: Wide Temperature Range, Durability, and Enhanced Safety, Stable Operation from -20℃ to 85℃, Eliminating the Risk of Thermal Runaway
The slender, sealed environment of the battery easily accumulates heat and must withstand transportation vibrations and extreme temperature conditions, making product safety and stability paramount.

Dimension Four: Categorized as a Capacitor, Exempt from EU Battery Regulations, Simplifying Export Certification

The EU's new EU 2023/1542 regulation sets stringent requirements for lithium battery carbon footprint, recycling standards, and product labeling, lengthening the lithium battery export certification cycle and drastically increasing overall costs. SLX products fall under the category of capacitors and are not subject to this regulation. They have already obtained multiple authoritative certifications, including UL810A, UN38.3 (air transport), RoHS, REACH (environmental protection), ISO14001, and IATF16949. Benefits include: shortening customer product certification cycles by over 50% and reducing overall compliance costs by over 60%.

IV. Moving Beyond Price Competition: Creating Long-Term Value Through Comprehensive TCO and a Stable Supply Chain

Our products benchmark against Japanese capacitor performance standards. Instead of relying on low-price competition, we help customers mitigate hidden losses throughout the entire supply chain:

Avoiding mass rework and brand compensation losses caused by premature component degradation;

Avoiding project delays and product launch delays caused by certification bottlenecks and unstable supply;

A wide range of readily available specifications, providing customers with alternative sources and breaking the risk of monopolistic supply from a single brand.

Purchasing Yung-Ming's SLX series is not just about purchasing an energy storage component; it's about gaining long-term stable product performance, controllable maintenance costs, and a secure dual supply chain guarantee.

V. YMIN Original One-Stop Technical Support

As a self-developed capacitor manufacturer, YMIN provides comprehensive support throughout the entire process: Selection and Support: Covering the entire range of slender specifications from 1.5F to 70F; Testing Support: Customized lifespan and performance simulation verification based on actual customer usage conditions; Sample Support: Rapid sample delivery to accelerate product development and production.

Conclusion

Leveraging its ultra-fine outer diameter, YMIN's SLX hybrid supercapacitor offers a one-stop solution to the four major challenges of energy storage for slender devices: "limited assembly, slow charging, short lifespan, and compliance difficulties in overseas markets." Whether optimizing the grip of a stylus or resolving compliance issues for exporting sensor devices, the YMIN SLX is the preferred energy storage solution for elongated devices.