Analysis of lithium battery protection board charging equalization function

When we are making lithium battery protection boards, we often ask our customers if they need to charge balance. So what is the charge balance? Charging equalization, referred to as equalizing charge, is the charging of the characteristics of the balanced battery. It refers to the imbalance of the battery terminal voltage due to individual differences in the battery, temperature difference, etc. during the use of the battery. In order to avoid the deterioration of the imbalance trend, It is necessary to increase the charging voltage of the battery pack and activate and charge the battery to achieve a maintenance method for balancing the characteristics of each battery in the battery pack and prolonging the battery life. After understanding what is the charge equalization function how do we choose whether to bring this function in the lithium battery protection board production?

1. It is necessary to have a balanced situation: in the case where the storage time of the battery pack is completed, the static power consumption of each protection board is different and the self-discharge rate of each battery core is different, forming a battery of the entire battery. The voltages are inconsistent, so there is a significant pressure difference, but when the capacity is consistent, the equalization voltage is balanced on the battery pack, so that the full capacity and full discharge of the battery pack capacity can be achieved, so that the battery pack can maximize the effect. .

2. Equilibrium does not work: Many people think that the battery pack plays a role in the middle and late use of the battery pack. In fact, when the battery pack is used in the middle and late stages, the capacity loss of each battery cell is different, causing a difference in capacity. Balance by the protection board cannot make up for the capacity of the battery. The voltage of each string of the battery pack on the surface is the same. However, due to the inconsistency of the capacity, the charge and discharge are often the one-string battery with low capacity and the over-discharge protection. Overcharge protection, so the capacity of the battery pack is reflected by a single string of batteries with low capacity. Therefore, we should understand that the protection board is balanced with voltage, and the capacity cannot be supplemented.

3. Contradictions in the equilibrium effect: There are generally two elements in the equilibrium: A: Equilibrium voltage setting: The equalization voltage setting is low, the protection board is turned on, the equalization time is long, and the equalization effect is obvious, but the protection board generates heat while balancing. The longer the equalization time, the more heat is generated, which directly affects the performance of the protection board or the damage of the protection board; the equalization voltage setting is high, the equalization opening time is short, and the equalization effect is not obvious.

4. Equilibrium current setting: The equalization current setting is large, and the equalization effect is obvious. However, the equalization generates heat and damages the protection board; the equalization current setting is small, the equalization effect is not obvious, and the equalization time is also short.

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