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Capacity Consistency And Attenuation Characteristics Of Decommissioned Lithium Iron Phosphate Batteries

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Sep 16, 2018

Capacity Consistency and Attenuation Characteristics of Decommissioned Lithium iron Phosphate Batteries


ABSTRACT: 

Capacity inconsistency brings challenges to battery reorganization and management, and the sudden change of battery capacity attenuation affects the reliable operation of energy storage system with cascade utilization.


Introduction:


Lithium-ion batteries are widely used in various electric vehicles because of their high specific energy, high temperature characteristics and long cycle life. Electric vehicles require high performance of power batteries. When the capacity of power batteries drops to a certain extent, it must be replaced in order to ensure the power performance, driving mileage and safety performance during operation of electric vehicles. Usually, the battery replaced from the electric vehicle (abbreviated as "decommissioned battery") still has a high residual capacity. After screening and reassembly, it can be used in relatively good operating environment, relatively mild charging and discharging conditions, relatively low battery performance requirements for energy storage occasions, to achieve power battery ladder. Use. The core technologies of cascade utilization of decommissioned batteries mainly include battery sorting and evaluation, group balance, operation and maintenance, and economic evaluation. After the reconstitution and integration of retired batteries, they are mainly used in low-speed electric vehicles, booster cars, DC power supply, micro-grid and other scenarios, and they are also possible to be used in large-scale energy storage technology. Relevant research institutes have carried out corresponding research from different perspectives of technology and application.


Conclusion:


At present, there is a lack of research on the cyclic performance test data and analysis results of typical retired batteries, which is not conducive to the subsequent research on the methods of reclamation and attenuation characteristics of batteries. Many demonstrative projects of energy storage of decommissioned batteries which were put into operation in the early stage have been out of commission. It is common that the performance of individual batteries module has the phenomenon of accelerated attenuation and abrupt change during operation. However, the relevant operation data and typical fault analysis have not been reported, and the analysis and characterization method is not perfect, which is not conducive to large-scale ladder utilization. Promotion of energy storage technology.