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Big changes are underway in Hainan—and they’re designed to make everyday life smoother for residents, expats, and businesses alike. China's Hainan Free Trade Port will officially launch island-wide independent customs operation on December 18, 2025, completing its transition into a full-fledged Free Trade Port.
In April 2018, China announced plans to transform the island into a pilot free trade zone, with a long-term vision of developing a free trade port with Chinese characteristics. A master plan released in 2020 aimed to make Hainan a globally influential hub for high-level openness by mid-century.
Wang Yang publishes an official definition of a free port in the People’s Daily. Announcement of a free trade zone covering the entire island of Hainan during the 30th anniversary of the Special Economic Zone. Launch of the Master Plan for the construction of the Hainan Free Port, aiming for global status by 2050.
The "Notice on Preferential Corporate Income Tax Policies for Hainan Free Trade Port" proposed that enterprises in encouraged industries registered and operated in Hainan Free Trade Port shall be subject to a reduced corporate income tax rate of 15%.
Battery management systems (BMSs) are discussed in depth, as are their applications in EVs and renewable energy storage systems. This review covered topics ranging from voltage and current monitoring to the estimation of charge and discharge, protection, equalization of cells, thermal management, and actuation of stored battery data.
One way to figure out the battery management system's monitoring parameters like state of charge (SoC), state of health (SoH), remaining useful life (RUL), state of function (SoF), state of performance (SoP), state of energy (SoE), state of safety (SoS), and state of temperature (SoT) as shown in Fig. 11 . Fig. 11.
One of the key functions of a BMS is cell balancing, which ensures that each cell in a battery pack is charged and discharged uniformly. Cells in series often exhibit slight differences in capacity, causing certain cells to overcharge or undercharge.
The BMS employs multiple algorithms including coulomb counting, voltage-based estimation, and advanced techniques like Kalman filtering to provide precise charge level information. SOC accuracy directly impacts user experience and battery protection. Overestimation can lead to over-discharge, while underestimation reduces usable capacity.
