What Are The Balancing Methods For Lithium Battery Packs?

The application of lithium battery packs in the market and in various fields is not uncommon, bringing many benefits to our life, industry, etc. Of course, the most important link in the charging and discharging process of lithium battery packs is the balance link, because you It is necessary to ensure that the output of the lithium battery pack and the output are reasonable to each cell. At present, the two most common methods of lithium battery pack balancing are energy-consumption balancing and energy-transfer balancing.

Lithium battery pack energy-consumption equalization, as the name suggests, is to use resistors to drain excess power from a certain high-voltage battery in the lithium battery pack. The cost of this method of balancing is relatively low, and the design is relatively simple. It can play a certain role when the voltage between the single lithium batteries in the lithium battery pack cannot reach the same level, but relatively, this method is also more balanced. It is prone to failure, and the temperature emitted by the lithium battery is higher when it is balanced. And there is one thing, because the capacitance of each single cell in the lithium battery pack is not the same, so every time you charge, the battery with a smaller capacity will quickly reach saturation. Because the battery with a larger capacity is still being charged, the capacity Smaller lithium batteries will be balanced, and the power will be consumed in a form similar to the amount of discharge, and the cycle will continue until the large-capacity battery is saturated, so you can imagine that the overall performance of the smaller-capacity battery will be greatly reduced over time , This is the same reason as the performance degradation of our mobile phone battery for a long time. 

Therefore, the energy consumption balance of lithium battery packs has great disadvantages.

The energy transfer equilibrium of the lithium battery pack is also well understood, that is, the higher energy lithium battery in the battery pack is transferred to the lower energy lithium battery. This kind of equalization is indeed very practical at first glance, but in actual situations, The current energy transfer type equalization is not very perfect, because this way of equalization does not transfer energy by detecting the voltage of a single cell, but transfers energy through battery capacity. When the energy battery transfers energy, because the equalization current and the charging current are fixed and uncontrollable, during the transfer, the low-capacity battery may reach the overcharge value, and the lithium battery protection board will work to stop charging, then The entire cycle will therefore end.