Development Of Battery Module Test System Based On LabVIEW

With the explosive growth of sales and ownership of new energy vehicles,the lithium battery industry has achieved rapid development.However,whether it is a newly produced battery,a battery to be evaluated after a period of use,or a battery to be recycled and recombined after retirement,there are inconsistencies.Thence,it is usually necessary to test the single battery or module systematically with test equipment.After evaluating the basic performance,consistency and safety of the battery through the test data,it can be judged whether it can be safely put into use or the cause of the failure can be traced and reasonable.Land cascade utilization.Therefore,based on the LabVIEW platform,this article develops a battery test system that can quickly and accurately evaluate the performance of the battery module.The traditional charging process is turned into a controllable charging process.The intelligent module and graphical programming of the information collection of the power single battery are used to achieve Data collection,transmission and other functions.First of all,this article introduces the application scenarios and scope of the test system and analyzes the parameters that need to be observed when the test system is tested.In view of the existing and possible subsequent problems,the requirements of the test system are analyzed.A battery test system was built.The test system realized multichannel synchronization and rapid data collection.It not only can perform charge and discharge tests on the modules,but also achieve electrical isolation of each single test channel,and realize the charge and discharge test of the single battery.Secondly,this paper develops the host computer interface of the test system based on LabVIEW.The designed host computer interface includes communication connection module,equipment control module,data display module,data storage module and data analysis module.The communication connection module is responsible for establishing the communication between the host computer and the charging and discharging equipment,the equipment control module is responsible for controlling the operation of the charging and discharging equipment and the setting of test parameters,the data display module is responsible for displaying the collected battery data,and the data storage module is responsible for the test results.The data is stored in the Excel table,and the data analysis module establishes the connection between LabVIEW and python through the function of LabVIEW,and then can realize the function of data analysis.Finally,this article uses the designed battery test system to carry out single battery charge and discharge experiments and capacity estimation and show the results.Using the characteristics of the test system,the inconsistency of the battery module is explored,and the reasons for the inconsistency of the battery module and the equalization technology to solve the inconsistency are explained.In accordance with the power battery test standards,the selected BMS and test system were respectively carried out equalization experiments,which realized that the test system can not only verify the equalization effect of the BMS,but also can be used as the carrier of the equalization strategy to balance the inconsistent battery packs.Based on the difference in capacity,the effects of the two balancing strategies are compared.