| As a kind of backup and portable power, battery has been widely used in human life, theproduction of industries, transportation and communication and so on. Therefore, the dischargecharacteristics of battery strongly influence the use of electronic products. The output voltage,discharging current are the important specifications reflecting the performance of battery discharge.Thus, the detection of these parameters becomes the focus of the research on detection method ofbattery discharge. Undoubtedly, this will provide rare opportunity for the development of thebattery R&D, and will also promote the development of detection technology for detecting batterydischarge parameters. However, there is low accuracy, single discharge mode, channel congestion,data loss, cumbersome wiring and other problems to be solved existing in battery dischargesystems.During detection procedure of battery discharge the parasitic resistance is the key factor thataffects the measurement accuracy, thus one of the important measures to improve the detectionaccuracy of the battery discharge is to eliminate the influence of parasitic resistance. To solve theabove problems, we use the numerical control constant-current source (for short NCCS) as the loadinstead of the load resistance in this thesis. Doing this, we could make the output voltage of thebattery is just depend on the equivalent ideal voltage supply E and internal resistance r of thebattery, and the loop current I, while regardless of series resistors and parasitic resistance in theloop. In addition, in order to measure the battery’s output voltage more accurately, we use four-terminal measurement. Experiments show that the detection approach not only effectivelyeliminates the influence of parasitic resistance to measurement accuracy, but also achieves theunity of various discharge methods.In addition, this thesis uses a number of ZigBee End Device and a ZigBee Coordinator tobuild a Star wireless Network to replace the current wired Network, and in the data transmissionwe adopt a method that transmission after storage so as to avoidchannel congestion, data loss,cumbersome wiring, etc.The main contributions of this thesis can be summarized in the following parts. Firstly, afteranalyzing the background of the topic and introducing the present situation of relevant technologies,the thesis brings forth the research aims. Secondly, the background of scheme choice is describedand the principle of the detection method based on the numerical control constant-current source and four-terminal measurement is discussed. Thirdly, a plan of software and hardware to realizethe detection method is introduced. Fourthly, the hardware and software of wired and wirelesscommunication schemes are described. Finally, the results of the system are summarized andanalyzed, and the future development is put forwards.The experimental results show that the discharge detection technology approaches not onlyeffectively eliminates the influence of parasitic resistance to measurement accuracy, but alsoachieves the unity of various discharge methods, which can better meet the dual requirements ofmanufacturers, including both the detection accuracy of battery discharge and multiple dischargemethods. |
