Design And Simulation Of Measuring And Controlling System For Li-ion Battery

Recently, with the intensification of environmental pollution and energyshortage problem, energy conservation and emissions reduction has become oneof the premise of industrial growth, in the field of automobile manufacturing,researching the electric cars which using the lithium battery as the main powerenergy has become an important development direction. Nowadays people use avariety of electronic devices that are thin and portable, this requires smallerlithium-ion batteries at the same time to have greater battery life. Lithium batterymeasurement and control system can detect the various battery parameters oflithium-ion batteries, it provides reliable reference data for the performance studyof the lithium battery. In this paper, the design of lithium battery comprehensivetest system, it can measure the parameters of lithium-ion batteries, to solve theproblem of uncompleting parameter test and the single control algorithm in thecurrent lithium ion battery system.The proposed system can handle charging and discharging operation forbatteries up to8respectively in the same time and provide real-time operationparameters for display and storage on the computer. The computer is applied incharge of the identification and process of the required operation and dataprocess and storage as well as the central control unit. And the detection moduleis composed with MSP430F149as controller, charging and discharging controller,protection circuit, data acquisition circuit, regulating circuit, and analog switches.Communication is conducted by RS232between computer and module. Softwaredesign has involved the flow of capacity detection, internal resistance detectionand flow of charging and discharging control with filter.At present the battery testing system using the hardware closed-loopfeedback method, PID or fuzzy control algorithm, to realize the control systemfor the battery charging and discharging voltage value, but the control efficiencyis low and the control method is not flexible, it can’t meet the problems of rapid adjustment and precise adjustment at the same time. Aiming at the shortcomingsof the above control algorithm, in this paper, we put forward a algorithm of fuzzyself-tuning PID control, realizing rapid adjustment and precise control forcharging voltage in lithium-ion battery detection system. To verify the controleffect, on the hardware platform for control algorithm simulation, by thesimulation results, we can conclude that the fuzzy self-tuning PID controlalgorithm, it not only has flexible control method, but also has the advantages ofhigh adjusting speed, more accurate control and less overshoot.