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Research on Comprehensive Test System of Lithium Battery

by:dcfpower     2021-03-09
Abstract: With more and more applications of lithium batteries, higher requirements are put forward for the quality of lithium battery products produced. At the same time, higher requirements are also put forward for the lithium battery detection system. This article mainly introduces a comprehensive comprehensive test system for lithium batteries based on microcontroller control. The working principle is described. Keywords: lithium battery; detection system; single chip microcomputer; acquisition circuit 1. Introduction Now, among the various batteries in use, lithium battery is a new type of power source developed in recent decades, with high energy, no memory, The advantages of no pollution, etc., have become the preferred power source for portable devices. Since the 1990s, when Sony Corporation of Japan successfully developed lithium batteries, lithium batteries have always been a hot spot for research and development in various countries. With the rapid development of electronic equipment, the demand for lithium batteries is increasing. The demand for lithium battery testing equipment is also increasing. Many battery manufacturers in my country introduce foreign battery testing equipment, but they are very expensive. The measurement accuracy of domestic testing equipment, system stability, equipment utilization and automation procedures are very low.   Therefore, the research and development of an automated lithium battery pack formation, measurement, and sorting system that is reasonable in cost and can meet the needs of large-scale production is very much needed by many lithium battery manufacturers.   2. The overall design of the lithium battery detection system               in the process of battery charging and discharging the accuracy of the current and voltage to ensure that the control within the specified range is the core control method of the system. The system adopts the method of constant current and voltage, that is, in the constant current charging state, the voltage of each battery is continuously detected. When the voltage of the rechargeable battery reaches the saturation value, the charging state will automatically enter the constant voltage charging state from the constant current charging state. In the constant voltage charging state, a constant charging voltage is maintained. When the charging current drops to a specified value, the constant voltage charging state is terminated. It also sets the maximum time value in the constant voltage charging state. Once the mode is switched to the constant voltage charging state, the charging time is too long, and the charging is stopped immediately, which is a guarantee for the safe charging and discharging of the lithium battery.  The system adopts a modular structure, which makes the equipment installation simple and easy to maintain. There are a total of 512 detection points in each device, divided into 8 parts, there are 64 detection points in each part, and a separate constant current source is configured at each detection point to achieve single point independent control and mutual independence The affected system. The system uses a DSP controller as the main controller to control, an 8-bit single-chip microcomputer as a sub-controller to control, and one sub-controller to control one part. Therefore, use the combination of DSP, single-chip microcomputer, and switch constant current source to form an intelligent lithium battery comprehensive test system. Figure 1 shows the block diagram of the system. The main components are   2.1. Host computer   The host computer sends data to the DSP main controller through the serial bus, the controller controls the system operation start, stop, classification information, etc., and receives the main controller battery test data in real time. Perform data display and draw a graph. We use PC as the host computer.  2.2. Main Controller    is responsible for operating the overall running main controller, communicating with the upper computer, controlling the sub-controller, collecting data, control algorithm, liquid crystal display, keyboard processing, etc. We choose DSP as the main controller to complete the control.  2.3. Acquisition circuit   DSP built-in 16-channel analog-to-digital converter module, the system uses the controller to sample the voltage and current of the battery (512 sections), and each part occupies two A/D sampling channels. Because of the long signal transmission distance and some interference, the use of voltage transmission will affect the measurement accuracy of the equipment. The sampling signal of this system adopts V/I, I/V conversion signal method to transmit.  2.4. Sub-controller    Accepting the command of the main controller and independently controlling the detection points of the battery are the main tasks of the sub-controller. (Including the size of the current, charging and discharging status, switching value, etc.).  2.5. Componentsu003cpu003eFigure 1 The structure diagram of the systemu003c/pu003e   It is composed of battery clamp, power board, constant current source and so on.  3. Hardware design of lithium battery detection system  We designed the acquisition circuit according to the block diagram of the entire system. Data collection is common in computer application systems. In the battery test collection system, a very important link is the collection of voltage and current. The detection accuracy and sensitivity of the system are directly affected by its sampling accuracy. The main controller chooses the DSP controller with A/D. The system sampling signal is transmitted by means of voltage-current conversion, and the voltage signal is converted into a current signal for transmission. After entering the DSP sampling channel, the current signal is converted into a voltage signal. The interference problem generated during the transmission has been effectively avoided. Ensure measurement accuracy. The data acquisition structure diagram of the component is shown in Figure 2. u003cpu003eFigure 2 Data acquisition circuit structure diagramu003c/pu003e  4. The software design of the lithium battery application system adopts a modular design method. The main program of the system mainly includes: initialization program, interrupt service program, communication program, data The acquisition program, charge and discharge control program, control algorithm program, display program and other components, the main controller program flowchart is shown in Figure 7 below. During the operation of the system, according to the parameters set by the user and the real-time detection data to see whether to stop charging and discharging the battery. u003cpu003e
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