How to improve the performance of the power lithium battery pack?

(1) Through a large number of lithium battery charge and discharge tests, based on the decomposition of the existing lithium battery model, an improved second-order RC equivalent circuit model is proposed, which is convenient for automotive-grade embedded solvers. Online calculation. It is verified that the model can simulate the external characteristics of lithium batteries, and the good calculation accuracy of the model lays the foundation for the subsequent estimation of the state of lithium batteries. (2) The meaning of the battery state of charge is explained in detail, and the current more common lithium battery state of charge estimation theories are comprehensively compared, a test platform is built for the nickel-cobalt-manganese ternary lithium battery, and the mainstream Karl Mann filter SOC estimation method, proposed a SOC estimation algorithm based on improved iterative central difference Kalman filter and a new algorithm for weighted fusion of this algorithm with the open circuit voltage method. Experiments show that the new weighted fusion algorithm has higher estimation accuracy. (3) Aiming at the safe use of power lithium-ion batteries, the problem of battery maximum charge and discharge power estimation is studied, and a battery maximum estimation method based on the improved dual-polarization equivalent circuit model is proposed to charge the battery in actual use. The necessary control of the discharge power can maximize the efficiency of the battery on the one hand, and also protect the battery pack. (4) For the balance problem of power lithium battery packs, due to the double-layer switched capacitor balancing method has the advantages of fast balancing speed and simple control, but conventional switched capacitors are prone to switching losses and electromagnetic interference. To solve this problem, experiments Verification, simulation and test results all verify the effectiveness of the equilibrium control method proposed in this paper, and provide an effective basis and guarantee for the overall design of the power lithium battery pack management system. (5) On the basis of studying the state estimation and equilibrium theory of lithium-ion power lithium-ion battery packs, fault diagnosis and protection strategies of power lithium-ion battery packs, using improved hierarchical decomposition method to collect battery pack status information from the battery management system A comprehensive evaluation was carried out to evaluate the system reliability risk of the battery pack, which provided a quantitative basis for the protection strategy of the fault diagnosis system. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Is the development of lithium iron phosphate batteries related to the future of electric vehicles?