Optimized design of battery pole control system based on dual-chip architecture

Abstract

At present, the global demand for lithium batteries is still in a high growth state, and the traditional lithium battery pole mill control system is still dominated by ARM (Artificial Intelligence Enhanced Computing), DSP (Digital Signal Processing), and other single-chip control methods. There are problems such as poor anti-interference ability and insufficient real-time online analysis of production data. This paper adopts the dual-chip control system architecture based on "ARM+DSP", starting from the mechanical characteristics and operating signal features of the pole mill. The hardware system adopts a three-unit joint control hardware structure, which separates the control unit from the data processing unit and improves the operation of the system. The software system adopts fuzzy PID algorithm to realize deflection control and tension control, and verifies that the Fuzzy PID (Proportion Integration Differentiation) control algorithm can effectively improve the anti-interference ability of the deflection system and tension system. The results show that the data loss rate is low with the SPI communication between DSP and ARM. The tension error of the "ARM+DSP" control system does not exceed 5%, and the deviation of the correction band is within ±4mm. The dedicated dual-chip hardware architecture effectively improves the robustness and operation efficiency of the pole mill, solves the problem of low tension control accuracy, and provides a theoretical basis for the application of the dual-roll mill.

Research on AGC Nonlinear Compensation Control for Electro-Hydraulic Servo Pump Control of a Lithium Battery Pole Strip Mill

“…At present, the electrode rolling process of lithium batteries is usually completed by an electrode rolling mill, and the automatic control system of the hydraulic roll gap thickness (hydraulic AGC) is used to press the battery electrode sheet into a predetermined thickness under the rolling condition of a constant roll gap. Compared with valve-controlled AGC, pump-controlled AGC can not only effectively solve the inherent defects of valve-controlled cylinder technology itself, but also has the following advantages: (1) The use of pump-controlled technology can avoid the servo valve failure caused by the pollution of hydraulic oil by the external environment, reduce the cleanliness of the system oil (NAS7-9) and reduce the maintenance cost of the system. (2) The use of a pipeline-free connection in the pump control system can avoid oil leakage problems in the complex pipelines of the valve control system.…”

“…As the power source of new energy vehicles, lithium batteries account for about 40% of the cost of new energy vehicles, and their performance stability also determines the safety and driving range of the vehicle [1]. The roll forming of positive and negative electrode sheets of lithium batteries is one of the key processes, which has a great impact on the battery's use and safety performance.…”

Pump-Controlled AGC Micro-Displacement Position Control of Lithium Battery Pole Strip Mill Based on Friction Model

“…The manufacturing and molding of lithium batteries consists of multiple steps, such as mixing, drying, roll compression, slitting, earing, and encapsulation, as shown in Figure 1, and the roll molding of positive and negative electrode plates is one of the key processes and has a great impact on the final performance of the battery. At present, the roll-forming of the lithium battery electrode puts forward high requirements for the control performance of the automatic control of the hydraulic roll gap thickness (AGC) in the hydraulic electrode mill during rolling [3]. Electro-hydraulic servo pump-controlled AGC technology (referred to as pump-controlled AGC) can effectively solve the inherent problems of electro-hydraulic servo valve control technology [4,5], with the advantages of high efficiency, energy savings, a high power/weight ratio, and environmental friendliness [6,7].…”

Research on the Control Strategy of Battery Roller Press Deflection Device by Introducing Genetic Algorithm to Optimize Integral Separation PID

“…The combination of neural networks control and general PID can form neural network self-adjusting PID control strategy to realize good control of electrical-hydraulic servo system for steel strip deviation. To improve the dynamic response speed and performance of the system, RBF neural network is adopted to indentify and predict the system [7].The dual-chip control system of "ARM+DSP" proposed by Y. J. Xiao and S. H. Deng, etc., using the dual-chip architecture and fuzzy PID to improve the anti-interference capability of pole piece deflection and tension control [8].However, the control method in the overall amplitude of the equipment is too large or failure, the traditional PID control will produce the integral accumulation phenomenon, resistance to large interference signal when the control accuracy and speed is not enough. Among them, the initial parameters in the fuzzy PID and the selection of fuzzy rules mostly rely on experience, while the correction control in the polar piece rolling process is a nonlinear system that changes in real time, and the improper selection of initial parameters can also affect the control accuracy.…”