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The Difference Between Active Balance And Passive Balance Of Lithium Battery Protection Board

The Difference Between Active Balance And Passive Balance Of Lithium Battery Protection Board

1,Passive balance
Passive equalization generally discharges batteries with higher voltage by means of resistance discharge to release electricity in the form of heat and gain more charging time for other batteries. In this way, the power of the entire system is limited to the battery with the least capacity. During the charging process, the lithium battery generally has a charging upper limit protection voltage value, when a series of batteries reach this voltage value, the lithium battery protection board will cut off the charging circuit and stop charging. If the voltage during charging exceeds this value, which is commonly known as "overcharge", the lithium battery may burn or explode. Therefore, the advantages of passive equalization are low cost and simple circuit design; The disadvantage is that the balance is based on the lowest battery residual amount, the capacity of the battery with a small residual amount cannot be increased, and the balanced power is 100% wasted in the form of heat. Lithium battery protection board generally has overcharge protection function to prevent battery overcharge.

2,Active balance
Active equalization is carried out in the way of electricity transfer, which has high efficiency and small loss. Different manufacturers have different methods, and the balanced current varies from 1 to 10 A. At present, many active equalization technologies on the market are immature, leading to overdischarge of the battery and accelerating the battery decay. Most of the active equalization on the market adopts the principle of variable voltage and relies on the expensive chips of chip manufacturers. In addition to the equalization chip, this method also requires expensive peripheral components such as transformers, which are large in volume and high in cost. 

Passive equalization is suitable for small capacity, low number of lithium battery applications, active equalization is suitable for high number, large capacity of power lithium battery applications. For BMS, in addition to the balancing function is very important, the balancing strategy behind it is more important.

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