Research of lithium battery comprehensive test system

Source: 2020 - 04 - 12 21:38 hits: lithium battery comprehensive test system research abstract: with the application of lithium batteries more and more, the lithium battery products quality put forward higher requirements. At the same time, to lithium battery detection system also put forward higher requirements. This paper mainly introduces a kind of lithium battery comprehensive test system based on single chip microcomputer. Expounds its working principle. Key words: lithium battery; Detection system; Single chip microcomputer; 1 acquisition circuit. Currently, introduced in the use of various kinds of batteries, lithium battery is in recent decades developed a kind of new type power supply, has the advantages of high energy, no memory, no pollution, has become the first power supply of portable devices. SONY of Japan since the 1990 s successfully developed lithium-ion batteries, lithium-ion batteries have been the focus of national research and development. With the rapid development of electronic equipment, the demand for lithium battery is becoming more and more big. Demand for lithium ion battery test equipment is also growing. The domestic many battery manufacturers are introducing foreign battery testing equipment, but the price is very expensive. The measuring accuracy of domestic testing equipment, system stability, equipment utilization and automation degree is low. Therefore, developed a set of reasonable cost and can meet the needs of the mass production of automatic forming, measuring, lithium-ion batteries sorting system, need is a lot of lithium battery manufacturer. 2. Lithium battery detection system's overall design in battery charge and discharge process, to ensure that the current and voltage control precision is the core of the system within the prescribed scope control method. System adopt the method of constant current voltage, i. e. , continuously detect the battery voltage under constant current charging status. When charging the battery voltage reaches saturation, charging status from constant current charging status will be automatically entered into a state of constant voltage charging. In the condition of constant voltage charging, keep constant voltage charging. E. , when the charging current to constant voltage charging status is terminated. Set it most time values under pressure charging status, once the change pattern under constant pressure charging status, if the charging time is too long, will immediately stop charging, this is a guarantee for charge and discharge of the lithium battery. System adopts modular structure, make the equipment installation is simple, easy to maintain. Each device has 512 check points, is divided into eight parts, each part has 64 Olympic. In each station configuration of a single constant current source, the realization of a single point of control and mutual influence system independently. The system adopts DSP controller as the main controller, 8-bit single chip microcomputer as controller to control, a child controller to control a part. Therefore, DSP, MCU, and combined switch constant-current source, formed a smart lithium battery comprehensive test system. The structure of the system block diagram is shown in figure 1. Main component is 2. 1 PC sends the data to DSP through the serial bus master controller, the controller of the control system information such as start, stop, classification, and real-time receive master controller battery test data. Perform data display and draw the graphics. We choose the PC as a PC. 2. 2. Master controller is responsible for the main controller of the overall operation, and the upper machine communication, control of controller, data acquisition, control algorithm, LCD, keyboard processing, etc. We choose DSP as the main controller to complete control. 2. 3. Acquisition circuit, DSP adopts 16 channel AD converter modules. Controller is adopted in the system of battery ( 512) Sampling the voltage and current, each part 2 A/D sampling passageway. Due to the signal transmission distance long, plus some interference, etc. , using voltage transmission will affect measuring accuracy of the equipment. The sampling signal of the system by V/I and I/V conversion signal transmission.