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NGK - NAS Batteries
The world`s first large-capacity battery energy storage system and a major leap forward in the ability to provide a stable supply of renewable energy. A product of NGK`s proprietary advanced ceramic technologies, the NAS battery was the world`s first commercialized battery system capable of megawatt-level electric power storage. The NAS battery system boasts an array of superior features, including large capacity, high energy density, and long service life, thus enabling a high output of electric power for long periods of time.
NAS batteries have obtained the certification based on stationary storage battery safety standard UL 1973 (cell and module level) and a test report based on UL 9540A standard*, which is to verify batteries and storage battery systems fire risk, for confirming compliance with its evaluation criteria (cell, module and installation level) through the evaluation program of UL Solutions, a global independent safety science company.
* NAS batteries container type (including cells and modules on mounted) are covered .
Cell design
Hermetically sealed casing
High temperature ignited short-circuit current suppression system
Module design
Each cell is wound with insulation sheet and heat and corrosion resistive sheet
Sand filling
- Self extinction in case of fire
- Absorption of leaked active materials
Fuses
- To prevent short-circuits
Thermal enclosure
- To prevent the leakage of active material
- To absorb the external physical shock
Safety tests
In designing the NAS battery, NGK placed safety in paramount importance. The safety of NAS batteries has been proven in testing by NGK and third-party authorities and from decades of field experience. NAS batteries also comply with CE Marking requirements which are essential for exportation to Europe.
| Test | Test Result |
| Fire exposure | < Put module in fire > |
| No leakage. No fire. Safety confirmed. | |
| Submerge | < Submerge module at operational temp > |
| No leakage. No fire. Safety confirmed. | |
| Drop | < Drop module at operational temp > |
| Module enclosure was damaged but no damage to battery cells. No leakage. No fire. Safety confirmed. | |
| Short circuit | < Short circuit module > |
| Circuit was opened by internal fuses. | |
| No leakage. No fire. Safety confirmed. | |
| Self-extinguish | < Ignite one battery cell inside module > |
| No expansion of fire to adjacent battery cells. | |
| No leakage. No fire. Safety confirmed. |
In designing the NAS battery, NGK placed safety in paramount importance. The safety of NAS batteries has been proven in testing by NGK and third-party authorities and from decades of field experience. NAS batteries also comply with CE Marking requirements which are essential for exportation to Europe.
Test - Test Result
Fire exposure - < Put module in fire > No leakage. No fire. Safety confirmed.
Submerge - < Submerge module at operational temp > No leakage. No fire. Safety confirmed.
Drop - < Drop module at operational temp > Module enclosure was damaged but no damage to battery cells. No leakage. No fire. Safety confirmed.
Short circuit - < Short circuit module > Circuit was opened by internal fuses. No leakage. No fire. Safety confirmed.
Self-extinguish - < Ignite one battery cell inside module > No expansion of fire to adjacent battery cells. No leakage. No fire. Safety confirmed.