BATTERY POWER CAPABILITY ESTIMATION BASED ON REDUCED ORDER ELECTROCHEMICAL MODELS

摘要

A vehicle includes a battery made up of cells having positive and negative electrodes. A controller operates the battery according to a battery power limit based on a reduced order electrochemical model of the battery. The model includes states that are effective metal-ion concentrations at locations within the electrodes. A battery power limit is based on the metal-ion concentrations and parameters of a system matrix that includes coefficients indicative of a contribution of each of the concentrations to a gradient defined by the concentrations. The parameters are eigenvalues of the system matrix. The power limit is further derived by transforming the system such that the system matrix is expressed as a function of a diagonal matrix.

主权项

1. A vehicle comprising:
a battery including at least one cell having a positive electrode and a negative electrode; and at least one controller programmed to operate the battery according to a power limit that is based on a plurality of effective metal-ion concentrations associated with locations within the electrodes and parameters of a system matrix that includes coefficients indicative of a contribution of each of the concentrations to gradients of the concentrations.