Design And Implementation On Comprehensive Test Software Platform Of Vehicle Power Battery

As one of the new clean energy resources,the power battery has a great application prospect while the resources are in great shortage.The characteristics and scientific management methods need to be well studied before a large number to be put on the market.The internal chemical reactions in batteries are so complex that they often need various physical parameters to be described.Usually we take many kinds of test items on batteries to comprehensively and scientifically evaluate their performance.A comprehensive test software platform,which integrates various test functionalities,has been designed to intelligently test characteristics of batteries and simulate different operational states.Moreover,it can also estimate the batteries' performance according to the test results.Firstly,the overall architecture of power battery comprehensive test system is proposed based on the requirements to be met.The system consists of test devices and comprehensive software platform,meanwhile the comprehensive software platform is divided into upper computer and lower computer.The lower computer PLC program carries out test process and sends control commands to devices based on the test files,which makes the devices act on special behaviors.The upper computer software,acting as the interactive interface,accepts the test process information about batteries from users and shows test result data.Secondly,an approach that designing a modularized and multitasking PLC program aims at providing different communication modes between the platform and various devices is presented.More than one functional module can be called in one task.The PLC program is developed in the software TwinCAT3.And combined with fieldbus technology EtherCAT,the PLC program can make the different types of devices control and test come true.Also the PLC program can exchange data with upper computer,and achieve the centralized control of distributed equipment.Then,the method of graphic user interface is taken to design the upper computer software.The upper computer's input modes are flexible and result display ways vary a lot.And it also provides the data storage function.A CAN communication technology which is open to users is proposed and a communication protocol parser is designed in the upper computer.The means that taking the standard form DBC document as protocol in CAN communication can be used to parse almost all the communication data frame.And this DBC document can be configured or changed by users freely.Then,different kinds of test items are designed for the battery pack's characteristics test and operating conditions simulation.At thesame time,an on-line editing function for comprehensive test is designed,which is used to write test files including test items and process.The PLC program reads the file and executes test process,and realizes the intelligent test procedure.Then the upper computer shows test result data and takes the fuzzy reasoning diagnosis algorithm to assess the battery health state according to the test results,which can be used as a reference to strengthen the maintenance or replace the battery.Finally,the functional tests of the designed upper computer and lower computer and the overall comprehensive test software platform are taken.The results show that the designed software platform can meet the design requirements and has good engineering application value.