In the lithium battery protection board should not have a balanced function on the issue there are some controversy, the following is my opinion:
1. The situation that balanced function needed: in the battery pack to complete the storage time is relatively long, due to the different static power consumption of the protection board and the different self-discharge rate of the battery, the formation of the entire battery string of the battery Voltage is inconsistent, so there is a significant pressure, but to ensure the same capacity, the balance of the battery pack has a balanced voltage function, which can achieve the battery capacity of the full charge, full of the effect, so that the battery pack to maximize the effectiveness The
2.Situation that balance function do NOT work: a lot of people think that the battery pack under working,the balance pay a very important role, in fact, due to the different capacity of the battery capacity loss, causing a poor capacity , The protection board is not able to make up the balance of the battery capacity, the surface of the battery string voltage is the same, but because of the capacity of the inconsistency in the charge and discharge is often a low capacity single-string batteries first over-protection and Overcharge protection, so the capacity of the battery pack is to the capacity of a single string of batteries to reflect. So we should understand that the protection board is equal to the voltage, and the capacity can not be added.
3. Equalization of the existence of contradictions: Equalization generally have two elements: A: balanced open voltage setting: equalization voltage is set low, the protection board to open the equalization time is long, the balance effect is obvious, but the protection board at the same time Produce the heat, the longer the equilibrium time, the more heat generated, the direct impact of the protection board performance or protection board damage; balanced voltage set high, balanced open time is short, the balance effect is not obvious.
B: Equalizing current setting: Equalizing current setting is large, the balance effect is obvious, but the balance is generated heat, will damage the protection board; Equilibrium current setting is small, the balance effect is not obvious, the equilibrium time is short.
Summary: the battery pack within 13 strings, it is recommended not to balance the function is appropriate, but must be strict with the battery set off, as far as possible to the core capacity and internal resistance of the consistency. Lithium battery afraid of storage, not afraid to use! Lithium battery should be stored in the whole group should not be stored, the battery pack should be completed as soon as possible after the completion of the hands of consumers.If software BMS we do recommend balance function.
