As a new type of power technology, lithium-ion battery packs must be connected in series to meet the required operating voltage. The inconsistency in the performance of individual cells is not entirely due to battery manufacturing technology issues. Even if each battery has the same voltage and internal resistance when it leaves the factory, differences will appear after a period of use. This makes solving the charging technology problem of power lithium batteries an urgent technical issue to be addressed.
To address the consistency issue in the use of power lithium-ion battery packs, this paper proposes a method for implementing an equalization charging management circuit. First, the characteristics of a single lithium-ion battery cell are analyzed. Then, based on a comparison of various equalization charging theories, a partial current shunting method is selected as the design approach for specific circuit design. Multiple charge-discharge experiments with lithium-ion battery packs demonstrate that this equalization charging management circuit can effectively improve the charging consistency of lithium-ion battery packs, enhance battery pack performance, and extend service life.
Due to inconsistent battery performance, battery packs generally lag behind individual battery cells in terms of utilization, lifespan, and safety. Lithium-ion battery management systems with efficient balancing capabilities can significantly improve the overall performance of power lithium battery packs, effectively extend their lifespan, and greatly reduce the overall vehicle's operating and maintenance costs. This provides technical support for the promotion of safe, efficient, and practical electric vehicles.
