One of the largest U.S. demonstrations of battery-based storage uses sodium-sulfur, or NaS, batteries manufactured by Japan's NGK Insulators.
美国最大的电池储能技术之一使用的是硫化钠电池，由日本碍子株式会社（NGK）生产。
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The NGK battery is a cylinder with sodium in the center, separated from molten sulfur by a ceramic membrane that allows the passage of sodium ions to create the battery's current.