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As a new type of power technology, lithium-ion battery packs must be connected in series to meet the voltage requirements during use. The uneven performance of individual cells is not solely due to battery production technology issues. Even if the voltage and internal resistance of each battery are exactly the same when they leave the factory, differences will still occur after a period of use, making it an urgent technical problem to solve the charging technology of power lithium-ion batteries.
In order to solve the consistency problem in the use of power lithium-ion battery packs, this paper proposes an implementation method for a balanced charging management circuit. Firstly, the characteristics of individual lithium-ion batteries were analyzed; Then, based on the comparison of various balanced charging theories, the partial shunt method is selected as the design idea for specific circuit design. Multiple charging and discharging experiments of lithium-ion battery packs have shown that the balanced charging management circuit can effectively improve the consistency of lithium-ion battery pack charging, enhance the performance of the battery pack, and extend its service life.
Due to the inconsistent performance of batteries, the performance of grouped batteries in terms of utilization, service life, safety, etc. is far inferior to that of individual batteries. A lithium-ion battery management system with efficient and balanced management functions can significantly improve the overall performance of power lithium-ion battery packs, effectively extend the service life of lithium-ion battery packs, and greatly reduce the cost of vehicle use and maintenance. Provide technical support for the promotion of safe, efficient, and practical electric vehicles.
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