CR2032 battery manufacturers briefly discuss whether BMS is needed for lithium iron phosphate battery packs

　　CR2032 battery manufacturers briefly discuss whether BMS is needed for lithium iron phosphate battery packs? In recent years, large-capacity batteries without secondary pollution have come out one after another, and the performance-price ratio has become increasingly higher. Understanding the properties of the battery at all times requires a battery management system to achieve this. However, not only some people may wonder, does the lithium iron phosphate battery pack need a BMS?

　　Composition of lithium iron phosphate battery pack

　　(1)Battery module

　　For example, a 50Ah lithium iron phosphate battery requires 16 cells of 3.2V cells. The battery of this model is 4U high and can be embedded and installed in a machine room-less cabinet, and a single battery pack can be used in parallel to form a larger capacity battery pack.

　　(2)Battery Management System (BMS)

　　BMS is a circuit system mainly used to manage the battery charging and discharging process, improve the service life of the battery, and provide relevant information to users. BMS generally consists of monitoring, protection circuits, electrical, communication interfaces, thermal management devices, etc. Its main functions include intelligent charging management, battery balance management, intelligent intermittent charge and discharge management, thermal system management and communication management.

　　Lithium iron phosphate battery pack requires BMS

　　The ideal lithium-powered battery has a high degree of performance consistency. As long as it is not overcharged or discharged during use, there will be no safety issues. However, the actual situation is that the quality of mobile phone batteries fully meets the standards when they leave the factory, but explosions occur during use. There are also constant reports of fires, explosions and product recalls of battery packs used in laptop computers.

　　Lithium iron phosphate batteries have safety issues from the time they are produced until they are recycled at the end of their life. Even if they fully comply with international safety standards when leaving the factory, they will evolve from a safe state to an unsafe state during use. Good quality single lithium iron phosphate batteries have good performance Gradually declining and reaching the life limit, the performance of single batteries with poor quality will gradually experience various abnormal degradations and declines during use, entering the feared unsafe state. This is a gradual and cumulative process of change.

　　BMS is not dispensable as some battery manufacturers say, but a must, and it must be present throughout the application of lithium iron phosphate battery packs. There have been many studies on BMS at home and abroad, and it has begun to be applied in many fields. It has been able to meet the needs of some markets. The application of lithium power batteries has put forward higher requirements for the battery management system to ensure the safety of the power battery pack, which is the key to power. The first priority of the lithium iron phosphate battery management system.

　　Lithium iron phosphate battery pack BMS failure analysis method

　　●Fault reproduction method

　　The faults of lithium iron phosphate battery pack BMS vehicles are different under different conditions. If conditions permit, the fault should be reproduced under the same conditions as much as possible to confirm the problem point.

　　●Exclusion method

　　When similar interference occurs in the system, each component in the system should be removed one by one to determine which part is causing the impact on the system.

　　●Replacement method

　　When a module has temperature, voltage, control, etc. abnormalities, swap the positions of modules with the same number of strings to diagnose whether it is a module problem or a wiring harness problem.

　　The lithium iron phosphate battery provides driving power for the entire vehicle. It is mainly wrapped in a metal casing to form the main body of the battery pack protection. The battery core realizes the integration of the battery core through the modular structure design, and includes the cooling hardware of the battery core. The quality of the cooling system design is the prerequisite for BMS to achieve excellent management.

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