求翻译：钠硫蓄电池的相关技术尚处于发展阶段，其储备能量是铅酸蓄电池的2倍。钠硫蓄电池结构紧凑，能量密度高，并可以缓解封装问题。但要在约300℃-350℃的高温下工作，不使用时要保温防止电池凝固，因为一旦凝固就没有功率可发。钠硫的化学反应放出大量热量，故需要独特的回收结构。否则如果温度超过445℃硫就会沸腾使内压升高，危险性增加。钠硫蓄电池的回收工作很简单。欧洲国家，特别是英国在生产和使用电动汽车方面，有丰富的实践经验。英国的许多私营公司也正加速蓄电池技术的研究，特别是钠硫蓄电池的开发。是什么意思？

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sodium sulfur battery technology is still in a stage of development, the reserve of power lead-acid battery is the 2x. sodium sulfur battery compact structure, high energy density, and can alleviate package. However, you want to about 300 - 350 °C C ° heat when not in use, and work to prevent the ba

Sodium sulfur battery technology is still in its development stage, twice times their reserves of energy are lead-acid batteries. Sodium-sulfur batteries compact structure, high energy density, and packaging problems can be mitigated. But you want to work in about 300 ℃-350 ℃ high temperature, do no