Open-circuit voltage and SOC function relation optimization method

Abstract

The invention relates to an open-circuit voltage and SOC function relation optimization method, and belongs to the field of the new energy source measurement and control. The method proposes an OCV-SOC function relation optimization method for the open circuit voltage (OCV) and state of charge (SOC) function relation optimization target, the effective characterization of the lithium ion battery group function relation is realized through intermittent discharge experimental analysis and polynomial function fitting; on the basis of the intermittent discharge and lay-down experiment, the acquisition of the relation discrete point is realized; on the basis of the hybrid power pulse capacity feature testing experiment, the function relation is quickly acquired through charge / discharge process influence complementary way; on the basis of the contrast analysis fitting effect, the good dynamic fitting effect can be acquired by combining the six-order poly-nominal based on the least square method; on the basis of sufficiently considering the lithium ion battery group work, the function presentation of the open circuit voltage feature is realized by combining the OCV-SOC function relation optimization.

Description

technical field [0001] The invention relates to a method for optimizing the relationship between the open circuit voltage and the SOC function. The method aims at optimizing the relationship between the open circuit voltage and the SOC function of a lithium-ion battery pack, and comprehensively considers the accuracy of mathematical representation and the complexity of calculation, and constructs an open circuit voltage (Open Circuit Voltage , OCV) and the state of charge (State of Charge, SOC) OCV-SOC function relationship optimization method, through the intermittent discharge experimental analysis and polynomial function fitting, the effective characterization of the OCV-SOC relationship of lithium-ion batteries in groups is realized; The OCV-SOC function relationship optimization method is based on the intermittent discharge and shelving experiments, and realizes the acquisition of the discrete points of the relationship, and combines the curve fitting to obtain the functio...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency of the method for obtaining the relationship between the open-circuit voltage and the SOC function of the existing lithium-ion battery pack, provide a method for optimizing the relationship between the OCV-SOC function of the lithium-ion battery pack, and solve the problem of open-circuit voltage characteristics in the group application of lithium-ion batteries The function representation problem of

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