Battery balancing refers to the technique of achieving consistency among individual batteries in the battery pack in terms of voltage, capacity, and state, thereby enhancing the overall performance.
There are different techniques of cell balancing have been presented for the battery pack. It is classified as passive and active cell balancing methods based on cell voltage and state of charge (SOC). The passive equivalent to the lowest level cell SOC. The active cell balancing transferring will be equal.
The multi cell to multi cell (MCTMC) construction provides the fastest balancing speed and the highest efficiency (Ling et al., 2015). The various battery cell balancing techniques based on criteria such as cost-effectiveness and scalability is shown in Table 10.
The active cell balancing transferring the energy from higher SOC cell to lower SOC cell, hence the SOC of the cells will be equal. This review article introduces an overview of different proposed cell balancing methods for Li-ion battery can be used in energy storage and automobile applications.
The BMS compares the voltage differences between cells to a predefined threshold voltage, if the voltage difference exceeds the predetermined threshold, it initiates cell balancing, cells with lower voltage within the battery pack are charged using energy from cells with higher voltage (Diao et al., 2018).
What is a cell balancing method?
A cell-balancing method called inductive converters overcomes the disadvantage of small voltage differences between cells. In this method, the battery pack energy is transferred to a single cell by channeling the battery pack current through a transformer as shown in Figure 3 .
What is cell balancing in battery management systems (BMS)?
The concept of cell balancing in battery management systems (BMS) ensures that the energy distribution among the cells is balanced, allowing a greater percentage of the battery's energy to be recovered. This is especially important for long battery strings that are used in scenarios that frequently require recycling.