Analyze the detection and formation of power lithium batteries

Detection and formation of high-efficiency and energy-saving lithium batteries With the rapid development of the battery industry, leading battery manufacturers at home and abroad have invested a lot of funds and researchers to develop large-capacity, high-energy-density power lithium-ion batteries on the basis of small-capacity batteries. Lithium batteries are widely used in electric vehicle power systems, aerospace power systems, solar photovoltaic power generation systems, etc. due to their high working voltage, small size, light weight, no memory effect, no pollution, small self-discharge, and long cycle life. In the device. The detection and conversion of batteries is a crucial process in the battery processing. The use of batteries is related to the quality and quality of the battery, and directly affects the processing cost and service life of the battery. That is, the overall structure of the architecture system is shown in Figure 1. System architecture The entire system is mainly composed of four parts: rectifier cabinet, energy storage battery pack, conversion module (two-way DC/DC), and computer centralized control system. 1) The rectifier cabinet is mainly used for the initial charging of the battery and daily supplementary charging. Energy storage batteries are used to balance the impact of the charging and discharging processes between different forming units on the 400V DC bus (similar to the use of a pool), and can be made of low-cost or different types of batteries. Divided into modules (two-way DC/DC) When the battery cell is charged, the DC bus power is taken out of the cell for charging. When discharging, the DC/DC transducer converts the energy of a single battery into energy above 400V, and charges the energy storage battery through the bus. The DC/DC unit is the latest high-frequency and high-efficiency module, with a power of 94~96%, which can save about 90~93% of the energy loss caused by the discharge process. (4) Computer centralized control systems PC1 to PCN are used for the operation and data collection of formation/exploration operations. PC0 is the main control machine (multiple units available) used to produce the entire processing workshop, to realize the conversion between the working condition module and the control, to ensure the smooth progress of the entire processing process, and to save, process, and archive data. Job description: When a single battery is charged, it is powered by the grid, and the constant current charging is carried out through the rectifier cabinet and the conversion module (two-way DC/DC). The energy of the battery is converted into a module (two-way DC/DC) to discharge the energy storage battery. The more important advantage of this system is the formation of multiple batteries, some of which are charged and others are discharged. For this reason, a DC bus is designed to connect the rectifier cabinet and multiple conversion modules (bidirectional DC/DC). In this way, energy can be moved between different battery cells through the DC bus, preventing each discharge module from separately planning circuits to recover energy, thereby increasing the power of the entire device and reducing the cost of the device. In addition, under the control of the control system and the use of energy balance control strategies, by manipulating the operating time of different charging and discharging modules, as much as possible to make the charging energy equal to the discharge energy, most of the energy activities between the DC bus and the single battery are not only through Grid, from the energy conversion of the rectifier cabinet and the energy storage of the battery to balance the charge and discharge energy difference of the electric energy, the electric energy can be further developed. The DC bus voltage is 400v. It is very important that the selected first intention high-voltage DC bus is planned into a module (bidirectional DC/DC) DC bus. The higher the DC bus voltage and the line loss, the smaller, but it should not be too high, otherwise You will choose the difficulty of power electronic devices and the problems of bidirectional DC/DC coefficients and too many step-down ratios. Computer centralized control system planning is important for the technical requirements of battery conversion. In the process of battery conversion, a small number of personnel are used to monitor many battery conversions. In order to increase power and reduce labor intensity, it is necessary to choose centralized processing and monitoring. The charge and discharge data in the battery is very critical. It is the basis for judging the quality of the battery and the selection of the battery pack. It is necessary to establish a database through the computer system to store these data. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Who is better than a lead-carbon battery and a lithium battery?