The future focus of energy storage 18650 battery lithium ion 2200mah: echelon utilization technology

　　With the rapid development of new energy, distributed energy, microgrids, etc., the application of energy storage 18650 battery lithium ion 2200mah continues to expand, which greatly affects the stability and safety of these energy systems. In this way, how to effectively achieve better monitoring and management of 18650 battery lithium ion 2200mah, improve their product performance, and reduce maintenance costs during their life cycle have become important issues that must be considered in the development of the energy storage industry. As far as battery management technology is concerned, foreign levels are not significantly better than domestic ones. Xu Jianhong, general manager of Hangzhou Gaote New Energy Technology Co., Ltd. (referred to as Gaote New Energy), pointed out that they are all facing common problems such as further innovating technology and realizing cascade utilization of 18650 battery lithium ion 2200mah.

　　Implementing online maintenance is an important direction

　　At present, the application objects of battery detection and management systems in the power grid are mainly divided into two parts: the operating power supply of traditional substations and energy storage stations. Xu Jianhong introduced that the current operation of traditional substation operating power 18650 battery lithium ion 2200mah is in float charging mode. As a backup power supply, in the event of a power outage, it needs to provide operating power for the substation, such as communications, protection, lighting, etc.; 18650 battery lithium ion 2200mah in energy storage power stations are recycled and used for Peak shaving and valley filling and frequency and amplitude modulation are used to charge during the valley at night and discharge during the peak and valley during the day. The difference in operating modes also leads to great differences in battery monitoring and management technology in these two fields.

　　First of all, battery testing in traditional substations mainly involves measuring voltage, internal resistance, and verification of capacity discharge. The battery test of the energy storage station not only requires monitoring the battery voltage and internal resistance, but more importantly, calculating the current capacity (SOC) of the battery through the charge and discharge curve, and also evaluating the battery state of health (SOH). In order to ensure that the battery For consistency and battery life, 18650 battery lithium ion 2200mah also need to be balanced. The so-called balancing, simply put, is to adjust the 18650 battery lithium ion 2200mah with different cell capacities in a group of 18650 battery lithium ion 2200mah, release the ones with higher capacity, and charge the ones with lower capacity, so as to balance the capacity of the battery pack, so as to avoid lagging 18650 battery lithium ion 2200mah. short board effect. He said that the active balancing technology of Gaote New Energy is currently in a leading position in the industry and even the entire international market. At the same time, as substations become digital and unattended, battery testing is also beginning to become networked. Realizing online maintenance will be the development direction of battery detection and management. Xu Jianhong thinks.

　　In the future, we will focus on overcoming echelon utilization technology.

　　According to national standards, the cruising range of new energy vehicles should be greater than 150 kilometers, and now car manufacturers are also designing according to this standard. When the actual capacity of the battery pack declines to 70%, that is, when it can only travel 105 kilometers with a full charge, customers may think that the battery is broken and dare not continue to use it. According to national standards, when the battery capacity declines to 80%, it should be replaced. In fact, 18650 battery lithium ion 2200mah with 80% remaining capacity can still be used, such as in energy storage power stations. Because the life curve of lithium 18650 battery lithium ion 2200mah versus the number of cycles is nearly linear, for energy storage, a battery pack whose capacity has declined to 70~80% in an electric vehicle is only smaller than the energy, but can still be used. This undoubtedly extends the life cycle of the battery pack and reduces its use cost. Xu Jianhong said that this realizes the echelon utilization of 18650 battery lithium ion 2200mah. This will be what needs to be explored in the next phase of energy storage 18650 battery lithium ion 2200mah. he said.

　　However, there has always been a problem with the echelon utilization of 18650 battery lithium ion 2200mah. For example, removing a set of more than 100 18650 battery lithium ion 2200mah, retesting them, and then configuring them one by one into the energy storage system is a process that requires a lot of labor and time, is extremely uneconomical, and loses the tiered utilization of the battery pack. meaning. This is the main reason that hinders the cascading utilization of 18650 battery lithium ion 2200mah. In this regard, Xu Jianhong said that the composition of future car battery packs must be modular, which is like a lead-acid battery. There are 6 battery strings in a 12-volt lead-acid battery. We can also pack 18650 battery lithium ion 2200mah with more than 100 cells. Makes 6 or 8 modules. In this case, the workload of battery echelon utilization will be greatly reduced.

　　At the same time, how to modularize BMS and combine it with modular 18650 battery lithium ion 2200mah is also an issue that must be considered. Xu Jianhong explained that the BMS of the battery PACK is currently installed independently of the battery in the form of components. Future designs will integrate the BMS and the battery module to form a smart battery module with battery information. In this case, after the retired battery modules of the electric vehicles are removed, the relevant internal data will become known. There is no need to test and assemble the 18650 battery lithium ion 2200mah, and it also saves the work of reassembly. It only needs to be based on the information of the battery modules. , just install it directly on the energy storage station. In this way, the cascade utilization process from car battery PACK to energy storage battery pack will become very easy, and the difficulty of cascade utilization will be truly solved.

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