Introduction to Active Equalization

The discrete nature of the battery will affect the available capacity of the battery pack and the service life of the battery pack. The balancing ability of the battery management system is very important, and it is also a difficult point in the current battery management system. The two-way active equalization technology is by far the most efficient and lowest comprehensive cost solution among all equalization technologies. It has applied for a number of related patents and applied for national scientific research awards.

Two-way active equalization technology-intelligent control strategy

The two-way active balance control strategy of Goto Electronics is a balance strategy based on various battery information (voltage, capacity, SOC, etc.). This balance strategy can analyze various characteristic data of the battery in real time during the operation of the battery pack. According to the voltage and other data of each single battery in a certain period of time, select the single battery in the battery pack that needs to be balancedly charged and balancedly discharged, and use the principle of conservation of charge and discharge energy to determine the configuration of the single battery that needs to be balancedly charged and balancedly discharged. Ratio, to maximize the balance efficiency.

The active equalization strategy automatically implements the strategy with different weights of SOC and voltage according to the different characteristics of the battery according to the batterys charging, discharging, static or middle stage of charging and discharging, so as to improve the effect of active balancing and fundamentally improve the capacity of the single battery. Discrete and prolong the charging and discharging time of the battery pack.

Two-way Active Equalization Technology——Economic Benefit Analysis

Through the realization of intra-cluster bidirectional non-destructive active equalization and inter-cluster active equalization, BMS can greatly improve the battery energy storage systems charge-discharge depth and cycle life while improving battery performance consistency, thereby ensuring a better economical performance of the energy storage system. Income, according to the analysis of the annual battery decay rate indicators of some active balancing and passive balancing energy storage systems, active balancing has a good effect on delaying the decay rate of the battery stack. Generally, it is calculated by delaying the decay rate by 1% per year. , the income from delayed income is (taking 1MWh energy storage system as an example): (1+2+3+4+5+6+7+8+9) /100 * 1000KWh * 350 days (/year) = 164250kwh ,

At the same time, since the active balance delays the attenuation by about 1% per year, the service life of the battery stack that needs to be decommissioned after 10 years can still be extended by more than 1 year, and the energy storage income extended by one year can basically be considered as the income of active balance. :=350 days (annual average number of operating days)*1000*80% (decayed to 80%)=280000kwh; the sum of the above two income: 444250kwh;

Calculated on the basis of an average income of $ 0.116 per kwh, the income is: = $59,700;

The active equilibrium investment cost of 1MWh BMS is $ 0.00435/kWh higher than the passive equilibrium investment cost, 1MWh, the increased cost is: $ 0.00435*1000000=$4,354;

Investment income ratio: 59,700/4,354=13.71