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Abstract <p>The operation of balancers intended to equalize charges between battery cells has been investigated analytically and by means of simulation. Calculated relationships characterizing the energy efficiency of active balancers using capacitive and inductive elements for charge transfer are obtained. It is shown that the initial value of the efficiency of a balancer with capacitive elements, taking into account the permissible voltage variations of lithium-ion battery cells, does not exceed 76% and should gradually increase when these voltages are equalized. An active balancer that uses inductive cells to transfer charges exhibits the best characteristics for balancing charges between the cells of a battery. Its efficiency factor is less dependent on the uneven distribution of charges in the battery cells and can amount to up to 95% or greater in the course of operation, which, taking into account the accepted permissible voltage scatter characterizing these cells, can save up to 26% of electrical energy, which is especially important for energy saving in the case of high-capacity batteries.</p>

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Energy-Efficiency Evaluation for Active Lithium Battery Balancers

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • S. V. Myatezh,
  • A. V. Menshchikov,
  • E. Yu. Abramov,
  • R. N. Latyshev,
  • A. A. Chernov

摘要

Abstract

The operation of balancers intended to equalize charges between battery cells has been investigated analytically and by means of simulation. Calculated relationships characterizing the energy efficiency of active balancers using capacitive and inductive elements for charge transfer are obtained. It is shown that the initial value of the efficiency of a balancer with capacitive elements, taking into account the permissible voltage variations of lithium-ion battery cells, does not exceed 76% and should gradually increase when these voltages are equalized. An active balancer that uses inductive cells to transfer charges exhibits the best characteristics for balancing charges between the cells of a battery. Its efficiency factor is less dependent on the uneven distribution of charges in the battery cells and can amount to up to 95% or greater in the course of operation, which, taking into account the accepted permissible voltage scatter characterizing these cells, can save up to 26% of electrical energy, which is especially important for energy saving in the case of high-capacity batteries.