As an important component of photovoltaic energy storage and UPS systems, lithium batteries are becoming more and more popular and widely used.

　　High-end lithium batteries, especially lithium iron phosphate batteries, have the advantages of high safety, high environmental protection, and convenient installation. They can help photovoltaic energy storage and UPS systems complete flexible architecture deployment, modular construction, and intelligent operation and maintenance.

　　So what is the key to choosing a lithium battery pack?

　　Try to choose lithium battery products from well-known manufacturers.

　　Only through high-quality production process management and control of lithium batteries can the high quality and high consistency of the cells be guaranteed. Large manufacturers usually use laser welding machines for terminal welding. However, small manufacturers generally use manual bolt and nut crimping, which makes it difficult to ensure the reliable connection of the terminals.

　　Choose suppliers with sufficient R&D strength and adopt high-quality BMS (Battery Management System).

　　BMS is the core technology for the safety of the entire lithium battery pack. When the battery has any faults such as overvoltage charging, overcurrent discharge, battery short circuit, etc., the fault current can be quickly cut off through the BMS to prevent the risk of thermal runaway of the battery.

　　Choose a suitable lithium battery material system.

　　The lithium battery material system includes lithium iron phosphate, lithium manganate, and NCM ternary lithium technology. Lithium iron phosphate battery is the best choice because it has a cycle life of up to 4000 weeks, high safety, high temperature resistance, and a voltage platform that can perfectly replace lead-acid batteries.

　　It is necessary to consider the compatibility of the BMS system of the lithium battery pack with the photovoltaic energy storage and UPS system.

　　Unlike lead-acid batteries, lithium batteries have their own BMS, which is an intelligent battery with self-management and control capabilities, and communicates with photovoltaic energy storage and UPS hosts through CAN, RS485 and other protocols. Therefore, before using the lithium battery, the photovoltaic energy storage and the UPS host need to perform strict matching tests with them, and the overall system software needs to be updated for this lithium battery.