SECH develops and delivers customized energy storage solutions based on ultracapacitors – cells, modules and systems.
SECH SA
Villaz-St-Pierre (CH) · Wuxi (CN)New on Amplifa
About SECH SA
SECH SA, headquartered in Villaz-St-Pierre (Switzerland), designs, develops and delivers tailored energy storage and power supply solutions based on ultracapacitors (supercapacitors). The portfolio includes cells (small, medium size and large cells as well as hybrid ultracapacitors HUC), modules and custom systems including balancing and monitoring electronics, CAN communication interface and power electronics with DC/DC converters. The electrode technology is fully mastered in-house: activated carbon with a patented, optimized pore structure is applied to current collectors, processed into capacitor windings with separators, installed in hermetically sealed housings made of pure aluminum, joined by laser welding and impregnated with a high-performance electrolyte. While research and product development take place mainly in Switzerland, manufacturing is carried out exclusively in China at GMCC Electronic Technology WUXI Ltd, a sister company of SECH within the Sieyuan Group. Customers are OEMs, distributors and end users in the fields of automotive, transportation, power grid and UPS, renewable energy and industry. SECH is a one hundred percent subsidiary of Sieyuan Electric Co. Ltd, a listed Chinese company in the electrical power technology sector.
- Site
- Villaz-St-Pierre
- Processes
- Production of electrode material (activated carbon on current collector), Production of dry electrodes, Capacitor winding (electrodes and separators processed into a winding), Laser welding (housing, internal connections, cell-to-cell busbar connections), Impregnation of capacitors with electrolyte after drying, Automated manufacturing with online SPC monitoring, Assembly of ultracapacitor cells, modules and systems (including balancing/monitoring electronics), Production of ultracapacitor/supercapacitor cells (small cells, medium size cells, large
- Materials
- Activated carbon (activated carbon powder, structure-optimized), Aluminum (pure aluminum for housings and electrical contacts), Electrolyte (high-performance electrolyte), Separator material, Activated, structure-optimized carbon powder, Pure aluminum, High-performance electrolyte, Hybrid ultracapacitor cells (HUC)
- Certificates
- ISO 9001:2015, Automotive-grade certifications (products)
- Industries
- Automotive, Transportation/Rail, Power Grid & UPS, Renewable Energies, Industry
- 01
Electrode material: application of structure-optimized activated carbon onto
- 02
Production of dry electrodes (dry-electrode production systems)
- 03
Winding of electrodes and separators into the capacitor winding
- 04
Installation in a hermetically sealed housing made of pure aluminum
- 05
Laser welding of housing, internal connections and cell-to-cell busbars
- 06
Drying and impregnation with high-performance electrolyte
- 07
Automated manufacturing with online SPC monitoring
- 08
Assembly of modules and custom systems including electronics
- 09
Design/sizing and ESS integration with partners
Materials and Processes
Activated, structure-optimized carbon powder
Electrode material with a patented, optimized pore size distribution for high capacitance, low internal resistance and electrochemical stability.
Pure aluminum
Used for cell housings, electrical contacts and current collectors.
High-performance electrolyte
Used for impregnating the capacitor winding after drying; ions are matched to the pore sizes of the activated carbon.
Separator material
Processed together with the electrodes into the capacitor winding in an automated process.
Hybrid ultracapacitor cells (HUC)
Combine ultracapacitor with lithium battery properties (2.8–4.2 V, up to 77 Wh/kg, charging/discharging at up to 50C/80C).
Dry electrode process
Productive production of dry electrodes since 2025 in the new 25,000 m² facility in Wuxi.
Sites
Villaz-St-Pierre
CHHeadquarters, R&D, sales
Wuxi (GMCC Electronic Technology WUXI Ltd)
CNProduction of electrodes, cells, modules and systems
- Materials
- Activated carbon, pure aluminum, electrolyte, separator
- Automated, digitalized, intelligent ultracapacitor production lines
- Dry electrode production systems
- Fully automatic production line for large cells (60 mm)
- Production line with separator in the capacitor winding
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Production of electrode material (activated carbon on current collector)Engineering | – | – | – | – | Activated carbon (activated carbon powder), Aluminum |
| Production of dry electrodesEngineering | – | – | – | – | Activated carbon (activated carbon powder) |
| Capacitor winding (electrodes and separators processed into a winding)Engineering | – | – | – | – | Activated carbon, Aluminum |
| Laser welding (housing, internal connections, cell-to-cell busbar connections)Joining | – | – | – | – | Aluminum (pure aluminum for housings and contacts) |
| Impregnation of capacitors with electrolyte after dryingEngineering | – | – | – | – | – |
| Automated manufacturing with online SPC monitoringEngineering | – | – | – | – | – |
| Assembly of ultracapacitor cells, modules and systems (including balancing/monitoring electronics)Assembly | – | – | – | – | Aluminum |
| Production of ultracapacitor/supercapacitor cells (small cells, medium size cells, largeEngineering | – | – | – | – | Activated carbon, Aluminum |
| Production of hybrid ultracapacitor cells (HUC)Engineering | – | – | – | – | – |
| Development of custom energy storage and power supply solutionsEngineering | – | – | – | – | – |
4 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Fully automatic production line for large cells (60mm) | – | – | – | – | China |
| Automated production line with separator in the capacitor winding | – | – | – | – | China (GMCC) |
| Ultracapacitor production lines (automated, digitalized, intelligent) | – | – | – | 2025 | GMCC Electronic Technology WUXI Ltd, China |
| Dry electrode production systems | – | – | – | 2025 | GMCC Electronic Technology WUXI Ltd, China |
Additional services
Reference customers
Quality
The electrode material production is subject to strict quality controls; manufacturing is automated with online SPC monitoring. SECH is certified to ISO 9001:2015; GMCC's products meet certifications for automotive-grade standards.
| Evidence | Villaz-St-Pierre |
|---|---|
| ISO 9001:2015 | |
| Automotive-grade certifications (products) |
History
- 2010
Founding of the production company GMCC (GMCC Electronic Technology WUXI Ltd).
- 2025
Commissioning of a new production facility (25,000 m²) for electrodes and ultracapacitors in Wuxi; SECH ESS modules power the world's first E-STATCOM by Siemens Energy/TenneT (±200 MW).