Advanced sodium battery

The rise of energy demand and environmental concerns over the use of fossil fuels and their resource constraints have spurred increasing use of energy generated from renewable sources such as wind and solar. Power generated by solar and wind resources are abundance and ready availability, but they are variable and uncontrolled. An effective approach to smooth out the intermittency is to use electrical energy storage, storing excessive energy and utility it when needed. The energy storage technologies are also demanded to improve the reliability and security of future electrical grids.

To build this storage system requires the battery to have a very large capacity, the ability to store electricity for a long enough time and operate durably with many cycle of continuous charging - discharge.

The sodium sulfur battery was a topic of intense worldwide interest during the 1960s. This battery are based on a special material called sodium beta-alumina ( β''-Alumina), which acts as a solid electrolyte that separates substances from positive and negative electrodes. β''-Alumina (beta prime-prime alumina) is an isomorphic form of aluminium oxide (Al2O3), a hard polycrystalline ceramic, which, when prepared as an electrolyte, is complexed with a mobile ion, such as Na+, K+, Li+, Ag+, H+, Pb2+, Sr2+ or Ba2+ depending on the application. Beta-alumina is a good conductor of its mobile ion yet allows no electron conductivity.

But interest in the technology diminished for a variety of technical and economic reasons. In contrast, its "successor", the sodium nickel chloride battery, have been entered the commercialization phase. The sodium nickel chloride battery (or ZEBRA battery, so-called for the Zeolite Battery Research Africa Project) has been under development for almost 20 years.

Both technologies, including sodium sulfur batteries and sodium nickel chloride batteries, are still being offered to the market today by a handful of manufacturers.

However, the problem of heat treatment to shorten the startup time, temperature balance to control the voltage and the internal resistance of the battery is still in the research stage to optimize.

With its own improved technology for Powercentric Co. Ltd., We have produced sodium batteries that have a much shorter startup time than two days of equivalent battery systems, and allow for temperature balancing of each cell (battery) even in the large battery systems to control the voltage and internal resistance of the battery, to use energy efficiently.

SPECIFICATION OF PRODUCT

SODIUM-NIKEL-CHLORIDE BATTERY CELL
SIZE (W*L*H) mm 50 *50*270 (± 0.2)
WEIGHT g 3000 (± 2%)
NOMINAL VOLTAGE DCV 2.58 DCV 2.58
CAPACITY Ah 35
MAX DISCHARGE CURRENT A 122.5
EFFICIENCY % 90
START TIME h 1~2
CYCLE LIFE 80% DOD   3000
INTERNAL RESISTANCE mili Ohm 7~10
PRESSURE Bar 1~2
TEMP. OPERATION oC 270~350
SELF DISCHARGE   No
RECYCLABLE   Yes
ENVIRONMENT   Zero Emission
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