With the increasing demand for outdoor electricity and the frequent occurrence of natural disasters, emergency backup power has gradually become an important spare in family life. The portable energy storage industry has developed rapidly. EVTank data shows that in terms of shipments, in 2016, only 52,000 portable energy storage devices were shipped worldwide, and by 2021, the shipments will reach 4.918 million units, a year-on-year increase of 135.5%. In terms of market size, the global portable energy storage market size in 2016 was only 60 million yuan, and the market size in 2021 has reached 11.32 billion yuan.