A worker operates on a production line at a lithium battery factory in Tangshan, north China's Hebei Province, Nov. 29, 2020. Lithium battery production has recently become a leading industrial sector in Lubei District of Tangshan. It is estimated that local manufacturers turn out 780 million yuan (about 118 million U.S. dollars) worth of lithium batteries every year. (Xinhua/Yang Shiyao)

A robot works at a lithium battery factory in Tangshan, north China's Hebei Province, Nov. 29, 2020. Lithium battery production has recently become a leading industrial sector in Lubei District of Tangshan. It is estimated that local manufacturers turn out 780 million yuan (about 118 million U.S. dollars) worth of lithium batteries every year. (Xinhua/Yang Shiyao)

Workers check battery products at a lithium battery factory in Tangshan, north China's Hebei Province, Nov. 29, 2020. Lithium battery production has recently become a leading industrial sector in Lubei District of Tangshan. It is estimated that local manufacturers turn out 780 million yuan (about 118 million U.S. dollars) worth of lithium batteries every year. (Xinhua/Yang Shiyao)

A worker tests just-finished battery packs at a lithium battery factory in Tangshan, north China's Hebei Province, Nov. 29, 2020. Lithium battery production has recently become a leading industrial sector in Lubei District of Tangshan. It is estimated that local manufacturers turn out 780 million yuan (about 118 million U.S. dollars) worth of lithium batteries every year. (Xinhua/Yang Shiyao)

Workers operate on a production line at a lithium battery factory in Tangshan, north China's Hebei Province, Nov. 29, 2020. Lithium battery production has recently become a leading industrial sector in Lubei District of Tangshan. It is estimated that local manufacturers turn out 780 million yuan (about 118 million U.S. dollars) worth of lithium batteries every year. (Xinhua/Yang Shiyao)