The Design And Implementation Of Lithium Battery Formation Test System

With the miniaturization of electronic communication products, lithium batteries as an energy become the world’s hotspot again. Lithium batteries formation in battery manufacturing process as the key process directly affects the quality of the battery, in order to solve the problems of larger-scale production, battery formation independently, higher accuracy and so on, we put forward a new energy lithium batteries used in the production and research of large multi-functional formation. This paper is responsible for the design and implementation of mainboard embedded system, communication network in the formation systems. The main research content is as follows:1. The design and implementation of lower machine’s scalability.Through the priority chain relationship put different lower machines in series, according to the mechanism of competition with each other for the right of sending, which is independent and related work between lower machines, and the highest priority of lower machine can send data superiorly, to ensure that data send between the lower machines will not conflict, to realize single formation systems can control the lower machines as more as possible, and meet the demand of large-scale production.2. The design and implementation of the step broadcast and unicast.Channel control unit circuit is completely independent, which is responsible for constant current charge, constant voltage charge, constant current discharge and stand of lithium battery, the user can set different formation process for each lithium battery with computer software, to realize the independent control of lithium batteries. Of course, all formation systems broadcast, all layers broadcast and channels broadcast can be realized through the address resolution of instruction.3. The design and implementation of charge and discharge channel which has high precision acquisition and setting.Channel control unit circuit use the way of selecting, feedback and compare to realize the constant current or constant voltage control of hardware, using precision calibration instrument to calibrate each channel, for the correction coefficient of acquisition and setting, which can compensate the hardware error, and improve the precision of acquisition and setting. At the same time, Avoiding complex feedback adjustment and compensation in the software algorithm, reduce the complexity of the formation and test technology.The main innovation in this paper lies in improving the lower machine’s scalability of formation systems, what meet the demand for larger-scale production; have the capacity of formation each battery independently; have the calibration of channel, improve the formation control accuracy; have the software monitoring and feedback of more than50possible exception, such as fixture, batteries, mainboard hardware, step operation condition and so on; have the capability of hardware backup the measuring data automatically, after a power outage, computer abnormal or crash, system can restore data automatically, support for up to145hours of computer work offline mode(all channels backup data at the same time with60seconds interval); simplify the formation test technology, control the cost.Debugging with computer server and its software, interface board and other network system, which realize the scheduled system functions and index requirements, and solve some problems in existing formation systems.