CR927 battery.Introduction to lithium battery system technology

　　From the perspective of commercialized lithium-ion power battery systems, key core technologies include lithium battery group technology (integrated battery pack, thermal management, collision safety, electrical safety, etc.), battery management system (BMS) electromagnetic compatibility technology, signal Accurate measurement (such as cell voltage, current, etc.) technology, accurate battery status estimation, battery balancing control technology, etc.

　　In addition to further improvements in the safety, lifespan and consistency of lithium batteries, lithium battery modular technology and battery group technology (integrated battery pack, thermal management, collision safety, electrical safety, etc.) also have a clear gap with foreign countries. . At present, the battery pack technology of international automobile companies is relatively mature, and domestic research units have conducted relatively in-depth research on BMS electromagnetic compatibility technology, precise signal measurement technology, accurate battery status estimation, and battery balance control technology.

　　The research and development of key technologies for lithium battery management include comprehensive battery electrochemical models, electrical safety design, battery state estimation, equalization management, fault diagnosis and calibration, and charging management. The research and development of key battery thermal management technologies and systems need to study the heat dissipation and temperature equalization effects of different thermal management technologies based on the structural design of the battery pack and battery heat generation calculation and analysis, and obtain a battery thermal management and cooling solution with low cost, simple process, strong safety and reliability .

　　The lightweight structure of lithium batteries needs to be researched on the battery system and the related structures of the vehicle, taking into account the coupling characteristics between each other, and carrying out integrated optimization of structural vibration resistance, impact resistance and lightweight from two aspects: structural design optimization and material selection. Design key technology research work. Optimize component materials, structural design, connection and other design plans. In terms of lithium battery safety, it is necessary to carry out overall safety plan design research on the battery system based on electrical safety, mechanical safety and thermal safety, and carry out fault diagnosis for the battery system. Key technologies for prediction, thermal safety monitoring, early warning, and prevention and control.

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

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