You should maintain the battery environment at room temperature. This minimizes the retention of heat in the pack. Other than using cell balancing, you can keep the pack cool since heat is one of the primary factors that lead to thermal runaway.
By the use of cell balancing, every non-defective cell in the battery pack should be balanced to the same relative capacity as the other non-defective cells. This leads to thermal runaway when the rate of internal heat generation exceeds the rate at which the heat can be released. Other reasons for cell balancing include:īattery cells, especially lithium cells are very sensitive to overcharging and over-discharging. This is why balancing is absolutely required. Imbalanced lithium-ion cells die the first time you try to use them. Now, if you attempt to charge this group of cells to the correct combined voltage, the healthy cells get overcharged and thus get damaged as they will take the energy that the already dead cell is no longer able to store. For your cells that have different SoC and you start using them, their voltage starts dropping until the cell with the least amount of energy stored in it reaches the discharge cut off voltage of the cell.Īt that point, if the energy keeps flowing through the cell, it gets damaged beyond repair. The reason is that battery cells are fragile things that die or get damaged if they are charged or discharged too much. When you need several cells grouped together to power a device, you need to do some sought of balancing.
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