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Charge state estimation method of lithium-ion capacitor for electric automobile

A state-of-charge, electric vehicle technology, applied in instrumentation, computing, electrical digital data processing, etc., can solve the problems of lithium-ion capacitors that cannot be directly measured, complex nonlinear systems, etc.

Inactive Publication Date: 2017-01-25
XIAMEN UNIV OF TECH
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Problems solved by technology

However, the SOC value of lithium-ion capacitors cannot be directly measured
At present, Kalman filtering is a relatively mature method for predicting the SOC of energy storage devices, but the hybrid power system composed of lithium-ion capacitors and high-energy batteries is a very complex nonlinear system. When dealing with nonlinear problems, Kalman Filtering has certain limitations

Method used

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  • Charge state estimation method of lithium-ion capacitor for electric automobile
  • Charge state estimation method of lithium-ion capacitor for electric automobile
  • Charge state estimation method of lithium-ion capacitor for electric automobile

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Improved second-order model for lithium-ion capacitors:

[0037] Please refer to figure 1 A simplified dynamic second-order model of lithium-ion capacitors is established to characterize the dynamic relationship between the terminal voltage of lithium-ion capacitors, SOC, and internal resistance. The load current of lithium-ion capacitor I in the figure, U L is the terminal voltage, U ocv is the open circuit voltage; R 0 is the ohmic internal resistance. R p1 , R p2 is the polarization resistance, C p1 、C p2 is the polarized capacitance, which is used to describe the polarized voltage of lithium-ion capacitors. E is an ideal voltage source, the capacitor C b Indicates the open circuit voltage generated by the accumulation of current, E and C b together describe the open circuit voltage U ocv The change. According t...

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Abstract

A charge state estimation method of a lithium-ion capacitor for an electric automobile comprises the steps that S1, a dynamic second-order model of a simplified lithium-ion capacitor is established; S2, a state equation and an observation and equation are respectively established based on the dynamic second-order model; S3, lithium-ion capacitor parameters are identified; S4, artificial immune particle filters are brought to the established second-order model of the simplified lithium-ion capacitor to perform SOC estimation, and a charge state of the lithium-ion capacitor is obtained.

Description

technical field [0001] The invention relates to a method for estimating the state of charge of a lithium ion capacitor used in an electric vehicle. Background technique [0002] Lithium ion capacitor is a new type of energy storage element between supercapacitor and chemical battery developed at home and abroad in the past ten years. It has the discharge power of a supercapacitor, but also the ability of a chemical battery to store charge. Compared with supercapacitors, lithium-ion capacitors have larger capacitance and higher energy; compared with chemical batteries, lithium-ion capacitors have higher specific power and extremely long service life (the number of charge and discharge cycles can reach ten More than 10,000 times) and no maintenance and no environmental pollution. Therefore, lithium ion capacitor is an efficient, practical, and environmentally friendly energy storage device. Its superior performance has attracted the attention of all parties, and it is develo...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 卢向军周振威谢安张勇
Owner XIAMEN UNIV OF TECH
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