Wanhua Chemical Group Co., Ltd.

Yantai Chungway New Energy Technology Co., Ltd.

Yang Wang

Weiqi Hua

Hongke Zhang

Yu Yao

Dongke Zhao

Bin Chen

Dan Xu

Lilei Zhang

Mingming Li

Xiaotong Shi

Qinglong Chen

Qile Shi

Yi Deng

Dekai Shi

Chunli Wang

The present invention discloses a battery pack charging system, comprising battery packs and a charging cabinet, a nitrogen replacement device is arranged inside the charging cabinet, the charging cabinet provides charging and nitrogen filling for the battery packs, wherein: there is a gas-filling protective device arranged between the nitrogen replacement device and the battery packs, and the gas-filling protective device is used to regulate the gas-filling flow of nitrogen automatically. Also disclosed is a charging method of the battery pack charging system. Beneficial effects: Different from the existing battery pack forms of electric bicycles, the present invention provides a feasible technical support for the 'shared power changing' of the existing electric bicycle battery packs; Secondly, on the basis of improving the battery pack of electric bicycles, a battery cupboard capable of charging and filling nitrogen into the battery pack at the same time is provided for the battery pack, thus fundamentally preventing the thermal runaway of the battery; Moreover, a new method is provided for filling nitrogen into the battery pack, avoiding the defects of using double solenoid valves and oxygen concentration sensors in the existing technologies.

Battery pack charging system and charging method thereof

A solvent refining method for isocyanate prepared by the phosgene method and multistage absorbing towers used in same. Solvent to be refined which contains water, iron, and/or phosgene, hydrogen chloride and other materials with color is dealt by the present method and multistage absorbing towers, which can effectively prevent a drying agent from absorbing water and hardening, partial overheating in the tower and generating channeling. Meanwhile, the pressure drop is effectively lowered. In addition, the content of water is &#x2266;50 ppm, the content of iron is &#x2266;5 ppm, the content of phosgene and hydrogen chloride is &#x2266;20 ppm, Pt&#x2014;Co chroma is &#x2266;20 in the refined solvent. Therefore, the refined solvent can be used as the solvent for preparing isocyanate in the phosgene method and remarkably improve an L color of isocyanate.

Solvent refining method for isocyanate prepared by phosgene method and devices used in same

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Yantai, China

Yang Wang