Application of iron-lithium battery UPS power supply on highway power supply system. In China, the construction of expressways is booming, and the level of operation and management of expressways is also increasing. Computers and various new electronic devices are widely used in the three major electromechanical system hardware facilities. Since these electronic devices play a very important role in highway operation management, they must be continuously and stably operated for 24 hours, and the quality indexes such as voltage, frequency, and harmonic interference of the power supply are required to be high. Therefore, it is necessary to provide a power supply with good indicators and continuous uninterrupted power. Lithium battery UPS power supply can meet this demand.