Method and system for estimating charge state of storage battery

A state of charge, storage battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc.

Active Publication Date: 2013-07-24
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

[0010] Based on this, it is necessary to provide a method and system for estimating the state of charge of a battery in view of the technical problems that the existing technology cannot meet the requirements of accurately estimating the SOC value of the battery while improving the flexibility of the algorithm and reducing the amount of calculation

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  • Method and system for estimating charge state of storage battery
  • Method and system for estimating charge state of storage battery
  • Method and system for estimating charge state of storage battery

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[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0066] Such as figure 1 The above is a working flow chart of a method for estimating the battery state of charge of the present invention.

[0067] A method for estimating the state of charge of a storage battery, used for estimating the state of charge of the storage battery under a preset measurement terminal voltage and measurement discharge current state, comprising:

[0068] Step S101, acquiring a plurality of battery online state feature data, the battery online state feature data including multiple terminal voltage discrete point data values, discharge current discrete point data values ​​and discharge capacity discrete point data values ​​of the battery;

[0069] Step S102, according to the plurality of terminal voltage discrete point data values, discharge current discrete point data values, and discharge capacity discrete p...

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Abstract

The invention relates to the technical field of parameter estimation of a storage battery, in particular to a method and a system for estimating a charge state of the storage battery. The method comprises the steps of obtaining data of on-line state characteristic quantity of the storage battery; utilizing the Newton interpolation method to obtain a plurality of first functions of discharging capacity with terminal voltage serving as an independent variable and a plurality of second functions of discharging capacity with discharging current serving as an independent variable; obtaining an evaluation value of measurement discharging capacity in a state of measuring the terminal voltage and the discharging current according to at least one first function and at least one second function; and obtaining a corresponding evaluation value of the charge state according to the evaluation value of measurement discharging capacity. The method and the system for estimating the charge state of the storage battery utilizes the Newton interpolation method to carry out evaluation of an SOC value of the storage battery, can accurately derive the remaining capacity variation trend so as to intuitively analyze problems and fast predict a phenomenon, and can achieve on-line measurement and high accuracy.

Description

technical field [0001] The invention relates to the technical field related to battery parameter estimation, in particular to a method and system for estimating the state of charge of a battery. Background technique [0002] In solar photovoltaic power generation systems and photovoltaic / wind hybrid power generation systems, battery packs are used as energy sources to store and regulate electric energy. Usually, the battery pack in the system is composed of multiple batteries connected in series and in parallel, and is often in a cycle state. During operation, due to the individual differences of the batteries, there will inevitably be the phenomenon that the lagging batteries are over-discharged and under-charged in the battery pack. Repeatedly, the backward battery will fail early, which will seriously affect the service life of the battery. [0003] According to the requirements of relevant specifications, the single terminal voltage of each battery is not allowed to ex...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 崔琼舒杰吴志锋姜桂秀黄磊
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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