Introduction of Passive Cell Balancing:
Passive balancing circuits typically use resistors or other dissipative elements to divert excess charge from higher-voltage cells to lower-voltage cells. This process occurs during the charging or discharging cycles of the battery pack.
In battery pack with a variety of cells, such as cells with different capacities or chemistries, passive balancing becomes crucial. Cells with different capacities or chemistries may have different voltage characteristics, which can lead to an imbalance in charge levels.
To compensate for this imbalance, passive balancing circuits need to handle a larger voltage range and may require higher currents to equalize the charge levels of the cells effectively.
How to decide on value of Balancing current
1. Variety of cell in battery pack would required a Gross Balancing and Higher current for Balancing.
2. Some cells in Battery pack would required a Maintenance Balancing is lower current
required for balancing.
Some Basic calculation:
cell_ max_ voltage = (cell max voltage)
Balance _ Resistor = ( resistor value)
Balance _ amp = Cell _ max _ Vol / Balance _ Resistor
Find the resistor Power:
Res _ power = balance _ amp(square) * Balance _ Resistor
Basic Cell Balancing Circuit:
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