Amazed about how the power of the battery fluctuates? This blog is for you if you are intrigued by the concept of balancing cell voltages of your batteries. We have covered an insight into Cell Balancing, what is Battery Cell Balancing? What are the types of cell balancing? And the various algorithms that are used for the balancing of cell voltages.
We can only be thankful for the modern age vital energy storage devices- batteries- to keep u going on the edge, and living life to the fullest. For, if it had not been for a battery, that we can hold on to an overwhelming (and non-ending) quarter meeting without a power supply.
The science of Battery Management system BMS has enormously amazed us by acting as the kernel of battery points, keeping a check on the output, and providing security from external damages. A BMS functions include monitoring the temperature changes, arrange prevention and manage forecasts, and collecting information from the communication protocol of battery parameter analysis.
Now, when a battery consists of sequential cells in series, it surely needs proper cell balancing to keep its life cycle intact with optimization and highly performant.
Battery Cell Balancing also means battery redistribution to improve the overall potential of the battery pack and emphasize each cell’s longevity. Cell Balancing enhances the State of Charge (SOC) of your battery.
An imbalance is created when every cell in the connected series of the battery pack depicts a different SOC. Such an imbalance results in the overall battery capacity equal to the weakest cell in the battery pack.
However, to optimize the battery life, we must ensure that we bring a cell balancing to equalize the overall battery of each cell in the pack.
In the domain of Battery Management Systems (BMS), there are two types of Cell Balancing techniques available. Let’s get on them one by one.
In an active cell balancer, energy transfers from a higher voltage to a lower voltage cell within the battery. In other words, the cell with higher SoC transfers energy to a lower SoC cell. Thus, the active cell balancing technique avoids dissipating heat energy and rather uses shuttling or converters to balance out the energy levels of the highest voltage cell and the lowest.
The charge shuttling method transfers charges to reach an equal cell voltage. Whereas, energy converts transfer energy via transformers and conductors.
Advantages of Active Cell Balancing
Disadvantages of Active Cell Balancing
In the Passive Cell Balancing technique, there is a burn-off of excess energy from the higher energy cells till it matches or equals the lower voltage cell. There can be either fixed shunting or switching shunting resistor method for passive cell balancers.
Advantages of Passive Cell Balancing
Disadvantages of Passive Cell Balancing
Cell balancing can work on two types of algorithms:
In voltage-based cell balancing, voltage is considered as a reference and confirmed if all voltage levels are equal or not. If not, then cell balancing is activated by this method.
In history-based cell balancing, the state of charge (SoC) is taken as a reference and the difference between cell charges (available) is considered. If the difference is greater than 1, then cell balancing is activated by this method.
We hope this blog served the purpose of getting you acquainted with the idea of cell balancing, its types- active and passive cell balancing, along with their pros and cons. At Bacancy Systems, we ensure that you utilize the maximum capacity of your Batteries and optimize the efficiency by implementing the best suitable cell balancing techniques.
Do share your views on which methods shall you like to pursue for your battery cell balancing.
Cell Balancing helps you improve your Battery life by maximizing its capacity.
There is a current leakage when cells have different self-discharge rates or different coulombic efficiencies.
Certainly, the BMS accomplishes cell balancing by shuffling energy, wasting off the excess energy, and reducing charging current to the minimum low level.
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