| CPC G01R 31/388 (2019.01) [G01R 31/367 (2019.01); G01R 31/389 (2019.01); H01M 10/48 (2013.01)] | 14 Claims |
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1. A method for estimating a state of power (SOP) of a battery system, comprising:
when an operating condition comprises at least one data collection moment, determining a state of charge (SOC) of the battery system at the data collection moment in a current operating condition;
when a first dynamic correspondence among the current operating condition, an open-circuit voltage (OCV), and the SOC, and a second dynamic correspondence among the current operating condition, an impedance, and the SOC are determined according to an amount of lithium intercalation in a plurality of predetermined positions in an active material of the battery system in the current operating condition, looking up the OCV corresponding to the determined SOC from the first dynamic correspondence, and looking up the impedance corresponding to the determined SOC from the second dynamic correspondence, wherein the first dynamic correspondences corresponding to the different operating conditions are different, and the second dynamic correspondences corresponding to the different operating conditions are different;
determining the SOP of the battery system at the data collection moment of the current operating condition according to the looked-up OCV and the impedance, for outputting power to an electric vehicle equipped with the battery system;
determining the first dynamic correspondence among the current operating condition, the OCV, and the SOC, and the second dynamic correspondence among the current operation condition, the impedance, and the SOC according to the amount of lithium intercalation in the plurality of predetermined positions in the active material of the battery system in the current operating condition comprising the following:
determining the SOC corresponding to the amount of lithium intercalation at each of the predetermined positions at each of the data collection moments under the current operating condition according to the SOC of the battery system at an initial moment at the current operating condition, and characteristic parameters adopted to characterize characteristics of the active material and an electrode structure, wherein the predetermined positions are determined according to a particle size of the active material, a particle size distribution of particles, and kinetic parameters of the active material;
determining an equivalent SOC of the battery system corresponding to each of the data collection moments in the current operating condition according to the SOC corresponding to the amount of lithium intercalation at each of the predetermined positions at each of the data collection moments under the current operating condition; and
determining the first dynamic correspondence among the current operating condition, the OCV, and the SOC, and the second dynamic correspondence among the current operating condition, the impedance, and the SOC according to the equivalent SOC of the battery system corresponding to each of the data collection moments in the current operating condition,
wherein the plurality of predetermined positions comprises a first position contributing a first percentage of the SOC of the battery system, a second position contributing a second percentage of the SOC of the battery system, and a third position contributing a third percentage of the SOC of the battery system, a sum of the first percentage, the second percentage and the third percentage is 100%.
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