Sodium-ion pouch cells target cold-climate industrial niche
Grepow introduced a sodium-ion pouch cell series targeting industrial and cold-climate applications, offering high-rate discharge and customizable packs alongside existing nickel-metal hydride and lithium polymer lines.
On November 12, Shenzhen-based Grepow unveiled a sodium-ion pouch cell series as its third core chemistry, joining nickel-metal hydride and lithium polymer lines. The five models, ranging from 2 Ah to 7 Ah, are designed for industrial equipment, cold-weather systems, and high-current applications. All cells operate at a nominal voltage of 3.0 V, with the 7 Ah model rated to 4.0 V, while smaller cells have a 3.4 V charge cutoff. The company highlights lab-tested discharge capabilities of up to 45C for 30 seconds and pulse discharge up to 100C for two seconds.
Grepow reported internal testing results showing sustained performance under extreme cold conditions. A cell completed repeated three-second 28C pulse discharges after resting at -20 C for four hours, and the same protocol at 20 C after resting at -30 C. The cells also support continuous 0.2C discharge at -20 C for lower-rate output. In a separate internal comparison, Grepow claimed its sodium-ion cell delivered stronger high-rate pulse discharge than an LFP cell at -20 C, though figures remain unverified.
Cycle life data from Grepow’s internal testing indicates the sodium-ion cell retained 94% of its original capacity after 2,000 cycles at 25 C with 1C charging and 30C discharging, compared with 83% for an LFP cell under the same conditions. The company projects the cell could exceed 4,000 cycles before capacity drops to 80%, though this is a projection rather than a completed test result. The product page clarifies that actual service life depends on operating conditions and system design.
The sodium-ion pouch format distinguishes Grepow’s offering in a market dominated by prismatic cells. The company leverages nearly three decades of nickel-metal hydride production and high-rate lithium polymer packs for drones since 2012. Grepow provides customization in cell selection, pack structure, and battery management systems for specialized applications, including cold-weather vehicle starting, construction machinery, telecom backup power, robotics, and small stationary storage.