On May 24, 2025, reports indicated that China State Construction Fourth Engineering Bureau Co., Ltd. has applied for a patent for a device called a “DC High Voltage Household Energy Storage Box,” with a publication number of CN120033365A. The application was submitted on November 2024.
The patent summary reveals that this invention features a DC high voltage household energy storage box, which includes a cabinet. Inside the cabinet, several systems are installed: a power distribution system and a temperature control system. The temperature control system comprises an industrial air conditioner that is electrically connected to a DC-DC converter. The air conditioner is powered by stored electricity from a battery pack, after being converted by the DC-DC converter, and is managed by a control system.
The energy management system within the cabin continuously collects total electricity usage data, which includes information on external power consumption and the power used within the cabinet. Additionally, it monitors the overall temperature in the cabin, which encompasses the shell temperatures of each battery box, regional temperature data within the box, and temperatures at the ventilation holes of the cabinet door. Based on the total electricity usage and temperature data, the energy management system sends appropriate operational signals to the industrial air conditioner, battery pack, and high voltage box.
According to data from Tianyancha, China State Construction Fourth Engineering Bureau Co., Ltd. was established in 1991 and is based in Guangzhou. The company primarily engages in the construction industry, with a registered capital of 8 billion RMB. Analysis from Tianyancha indicates that the company has made investments in 104 enterprises, participated in 5,000 bidding projects, and holds 4,413 patents, along with 3,110 administrative licenses.
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