This project belongs to the field of spacecraft power supply technology. This project is to promote the practical application of lithium-ion battery packs in subsequent aerospace equipment such as microsatellites, space stations, interstellar landers and interstellar rovers. It is aimed at the lithium-ion battery packs and their charging control technology and equalization control technology in the power system of the test satellite No. 3. Conduct test verification. This project is the first time my country has truly used to verify new technologies such as components, payloads, and components of space vehicle platform components. Lithium-ion battery packs also participated in the on-orbit verification test as one of the test loads of Test Satellite 3. The on-orbit flight data of lithium-ion batteries and the on-orbit over-discharge protection verification of lithium-ion batteries for over-discharge of the battery pack are all for the future use of lithium-ion batteries and their on-orbit control technology on spacecraft., provides valuable test data and basis. This project builds a lithium-ion battery pack based on the original nickel-cadmium battery pack platform, and conducts tests on lithium-ion battery pack charging control technology, equalization control technology and discharge switching control technology. During the implementation of the project, the main innovations in technology include: (1) lithium-ion battery pack charging control technology to extend the on-orbit cycle life of lithium-ion battery packs;(2) lithium-ion battery pack on-orbit equalization control technology to improve the utilization of lithium-ion battery pack capacity;(3) lithium-ion battery pack charging rotation control technology to ensure the safety and reliability of the power supply system;(4) Discharge switching control technology for cadmium-nickel batteries and lithium-ion batteries to make full use of hardware resources of the power supply system and ensure the energy balance of satellite power supply. This project is mainly to meet my country's urgent needs for the application and development of lithium-ion battery packs in the future, and form a corresponding technology platform; on the basis of ensuring the safety and reliability of satellite systems, a number of power supply system technologies are applied, providing design basis and standards for the design of lithium-ion battery pack power supply systems. This project carries out experimental verification of lithium-ion battery packs, their charging control technology, and equalization control technology. It is of great significance to promote the practicality of lithium-ion battery packs in subsequent aerospace equipment such as microsatellites, space stations, interstellar landers, and interstellar rovers.