EJ Battery Management System ACTIVE CELL BALANCING

Why choose BMS with Active Cell Balancing?

Battery management system(BMS) plays a crucial role in ensuring the safety and efficiency of battery operation, and cell balancing is one of the essential control algorithms used in BMS.

In a battery pack, each individual cell has a different capacity that changes with charge and discharge cycles, and the state of charge of each cell decreases with age. Cell balancing is the process of equalizing the voltage among individual cells to ensure that they have almost the same state of charge after balancing.

Cell balancing is critical as each cell needs to be charged and discharged properly, otherwise, it can lead to thermal runaway and catastrophic failures. Two techniques of cell balancing are available in the market: passive cell balancing and active cell balancing.

Passive cell balancing is a cost-effective method where excess energy is drained in the form of heat, but the capacity of the pack is limited by the weakest cell. On the other hand, active cell balancing transfers energy from one cell to another through electronics, resulting in less energy wastage.

Two Techniques of Cell Balancing

Passive Cell Balancing

Passive cell balancing considers four cells: cell 1, 2, 3, and 4 with different states of charge. Cell 2 has the least state of charge, so cells 1, 3, and 4 are connected with a resistor to drain the excess energy. After passive cell balancing, the state of charge of cells 1, 3, and 4 will be the same as that of cell 2. The pros of this method are a simple architecture and a cost-effective method. However, the capacity of the pack is limited by the weakest cell, and the energy spent on the last state of charge is wasted as heat.

Active Cell Balancing

Active cell balancing considers four cells with different states of charge. Cell 1 has the highest state of charge, and cell 2 has the least state of charge. Energy is transferred from cell 1 to cell 2 through a capacitor, inductor, or DC-DC converter. After active cell balancing, all four cells will have a state of charge equal to the average of the four cells. The pros of this method are less energy wastage as energy is transferred from one cell to another, and the cons are the complex architecture and additional cost of electronics.

Why Choose EJ Batteries with Active Cell Balancing?

Even with the additional cost of electronics, EJ Batteries are BMS with active cell balancing, which ensures good battery performance, extends the battery life, and maximizes the battery’s potential.

In conclusion, choosing a BMS with active cell balancing is a wise decision as it ensures that each cell is charged and discharged properly, resulting in better battery performance and extended battery life. Passive cell balancing is a cost-effective method, but its cons make active cell balancing a more efficient and reliable technique. Choose EJ Batteries with active cell balancing for maximum battery potential.