14500 battery manufacturer explains why 14500 battery packs need balanced management?

　　14500 battery packs usually consist of one or several 14500 battery packs connected in parallel, and each 14500 battery pack consists of 3 to 4 batteries connected in series. This combination can simultaneously meet the voltage and power requirements required by notebook computers, medical equipment, test instruments and industrial applications. The 14500 battery pack BMS balance management system can effectively monitor, protect, energy balance and fault alarm the 14500 battery pack, thereby improving the working efficiency and service life of the entire power battery pack.

　　The use of 14500 battery balancing technology can solve the SOC and C/E mismatch problem, thereby improving the performance of series 14500 battery packs. The battery mismatch problem can be corrected by equalizing the battery during the initial adjustment process. After that, it only needs to be equalized during the charging process, while the CE mismatch must be equalized during both the charging and discharging processes. Although the product defect rate may be very low for 14500 battery manufacturers, in order to avoid the problem of too short battery life, it is still necessary for us to provide further quality assurance.

　　When using a 14500 battery pack, try to maintain a balance as much as possible, which is good for the safety of the 14500 battery. Otherwise, if some of the many single lithium batteries are abnormal or fail to be controlled in time, they will cause failure, fire, explosion, etc., which will affect the entire 14500 battery pack. Cause damage and cause malfunction.

　　At present, common 14500 battery pack balancing technologies mainly include energy-consuming passive balancing, charging balancing, and transfer-type active balancing. In terms of development difficulty, cost, balancing efficiency, and power utilization, passive balancing is the easiest to develop and has the lowest cost. , the balancing current is very small, usually within 100 mA, the balancing efficiency is low, and the power utilization rate is zero;

　　Charging balance is relatively complex and costs a lot. The balancing current can reach the ampere level, and the balancing efficiency and power utilization rate are high;

　　Transferred active balancing is more complex and relatively expensive. The maximum balancing current can reach more than several amperes, and the balancing efficiency and power utilization rate are the highest.

　　What are the criticisms of using a single 14500 battery?

　　First, the output power drops significantly. For the same load, especially the power load, the power performance drops rapidly and the full power running time is significantly shortened.

　　Second, the capacity is greatly reduced. The effective discharge time is very short, and the end of discharge is quickly displayed, and the actual discharge capacity is seriously reduced; when charging, it is fully charged very quickly, and the actual charging time is greatly reduced.

　　Third, serious heat generation occurs during charging and discharging. Lithium batteries that generate severe heat are mainly concentrated in batteries with severe capacity attenuation, and the temperature of the surrounding batteries rises rapidly through heat transfer. When too much heat accumulates in a short period of time and cannot be effectively controlled, thermal runaway is very likely to occur, and Cause battery explosion and fire accidents.

　　Fourth, battery life and mileage have been significantly reduced. When the load remains unchanged, the cruising time and cruising range will shrink significantly in a short period of time. This is most obvious in electric vehicles, and correspondingly, the charging capacity also shrinks significantly.

　　As far as current battery management technology is concerned, the only technology that can solve the consistency problem of 14500 battery packs is battery balancing technology. To fully utilize the battery capacity, the battery equalizer must support discharge equalization, charge equalization and static equalization at the same time. In addition, due to the existence of batteries with different capacities, there is a high voltage difference at the end of charge and discharge. Therefore, the battery equalizer It must also have a wide balancing current and high power conversion efficiency, which can both achieve efficient balancing and reduce losses during full utilization of capacity.

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