18650 battery 2500mah balancing technology can effectively prevent 18650 battery 2500mah thermal runaway problems

　　While energy storage and power 18650 battery 2500mah packs play an irreplaceable role, they also face huge challenges and risks in their own operations. They must not only provide designed power and capacity, as well as 18650 battery 2500mah life, but also ensure their own operational safety, especially to prevent thermal runaway. risks and the safety hazards they bring.

　　We all know that in addition to being sensitive to temperature, the most feared operations for batteries are overcharging and over-discharging. No matter what the situation is, it will cause irreversible damage to the 18650 battery 2500mah, especially the damage to the capacity is the most serious. For the same 18650 battery 2500mah , overcharging and over-discharging often occur in combination. Once overcharging occurs during charging, over-discharging will also occur under abnormal control conditions during discharging. Two injuries occur in one charging and discharging cycle, and multiple consecutive charging and discharging After cycling, the damage to the 18650 battery 2500mah will increase exponentially. Therefore, after the 18650 battery 2500mah is damaged by overcharging or over-discharging, the capacity of one of the key properties of the 18650 battery 2500mah pack will decrease rapidly, which is consistent with actual applications. This situation will cause the performance of the 18650 battery 2500mah pack to be in a degraded state, commonly known as a consistency problem. If the 18650 battery 2500mah is only overcharged and overdischarged, the problem is not serious. The main loss is capacity and 18650 battery 2500mah life. However, the risk of thermal runaway caused by this cannot be ignored and must be taken seriously, otherwise accidents will easily occur.

　　In order to improve management quality, important 18650 battery 2500mah packs are usually installed with a BMS 18650 battery 2500mah management system, which can monitor a variety of parameters for the operation of the 18650 battery 2500mah pack, including unit cells, such as current, voltage, internal resistance, maximum voltage, minimum voltage, overvoltage warning, Undervoltage warning, etc., but most of these systems have serious technical flaws, that is, they cannot actively intervene in abnormal batteries, and the management role is not played.

　　In recent years, fire accidents in energy storage, power, and cascade-utilized 18650 battery 2500mah packs have occurred from time to time, especially lithium 18650 battery 2500mah packs and cascade-utilized lithium 18650 battery 2500mah packs. After accident analysis, it was mainly caused by thermal runaway faults, which is the root cause of thermal runaway. The reason is mostly caused by the consistency problem of the 18650 battery 2500mah pack. Although these lithium 18650 battery 2500mah packs are equipped with BMS and have powerful monitoring functions, accidents have not been avoided. It can be seen that the problem still occurs in the design flaws and consistency of the BMS. Lack of management of sexual issues.

　　There are many solutions to the 18650 battery 2500mah pack consistency problem, and theory and practical applications show that the most ideal solution is 18650 battery 2500mah balancing technology. The capacity and working current of energy storage, power, and echelon utilization 18650 battery 2500mah packs are usually relatively large. When consistency problems occur, a larger balancing current is required. The more serious the consistency problem, the greater the balancing current required. If The balancing technology is involved early and is installed synchronously when the batteries are put into groups. Then, the smaller balancing current can basically be satisfied. However, if the consistency of the 18650 battery 2500mah pack is not good, the required balancing current will be larger. The specific balancing current required depends on the capacity of the 18650 battery 2500mah pack, the consistency difference and the actual working current, but if it supports The balancing current is larger, and the consistency of the 18650 battery 2500mah pack will be very good.

　　Among the various existing 18650 battery 2500mah balancing technical solutions, in view of cost and technical factors, diodes are usually used for freewheeling to transfer current or electricity. However, diodes have a large conduction voltage drop. Even if a large conduction voltage drop is used, The loss of small Schottky diodes is also very large when the current is large (for example, above 5A). The precious electric energy is lost as heat, which also increases the temperature rise of the equipment and reduces the efficiency and reliability of the equipment. It can be seen that in the design of a 18650 battery 2500mah equalizer, while increasing the balancing current, the working efficiency of the device must also be improved at the same time. The author of this article boldly innovated and found a new way to develop a new and special bidirectional synchronous rectification technology. It was applied to the design of a self-developed transfer real-time 18650 battery 2500mah equalizer. It not only doubled the balanced current supported, but also greatly improved the conversion efficiency. The temperature rise under balanced current is lower, and more importantly, the cost of the entire device is much lower than that of similar designs. This latest technology has applied for a national invention patent and has been applied to the newly developed and designed single 2V lead-acid 18650 battery 2500mah pack 18650 battery 2500mah equalizer and lithium 18650 battery 2500mah pack 18650 battery 2500mah equalizer. After testing, the single type 2 18650 battery 2500mah equalizer can support continuous equalization. The current is as high as 20A or more. When working at full load of 20A, the balancing efficiency of the 2V lead-acid 18650 battery 2500mah pack 18650 battery 2500mah equalizer is still as high as more than 82%. Within the full current range, the average efficiency is between 85-97%; while for lithium batteries The equalizer is more efficient, with an equalization efficiency of over 90% when working at full load. This 18650 battery 2500mah equalizer design supports current expansion to meet larger balancing current needs, and can also be used in parallel. Through the actual application test of the prototype in a large-capacity 18650 battery 2500mah pack, the application effect achieved the expected design goals. The attached picture is a 24-string 2V600Ah 18650 battery 2500mah pack balancing test chart. The white device on the 18650 battery 2500mah pack is a dedicated equalizer prototype for 2V lead-acid batteries with a designed balancing current of 10A. This high-power 18650 battery 2500mah balancing technology uses high-speed shunt technology to balance the voltage and capacity of batteries with different capacities. It is very obvious for preventing and controlling the risk of "thermal runaway" and improving the capacity utilization and cycle life of the 18650 battery 2500mah pack. It is also suitable for high-speed operation of supercapacitor banks. Balance, promotion and popularization of application are of great significance.

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