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A method for estimating the capacity of a single battery in a lithium-ion battery pack

A technology for lithium-ion battery packs and single cells, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc.

Active Publication Date: 2019-10-11
徐州普瑞赛思物联网科技有限公司
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Problems solved by technology

[0004] At present, there are many studies on the capacity estimation and SOC estimation of single batteries, but due to the inconsistency of single batteries, there is a certain difference in the available capacity after grouping compared with before grouping. method for Li-ion battery pack capacity estimation is not advisable

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  • A method for estimating the capacity of a single battery in a lithium-ion battery pack
  • A method for estimating the capacity of a single battery in a lithium-ion battery pack
  • A method for estimating the capacity of a single battery in a lithium-ion battery pack

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Embodiment Construction

[0036]The present invention will be described in further detail below in conjunction with the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0037] figure 1 Shown is a flow chart of the method for estimating the capacity of a single battery in a lithium-ion battery pack according to the present invention. The idea of ​​the present invention is based on the assumption that the aging paths experienced by the N single cells in the lithium-ion battery pack are the same, and the SOC-OCV curves of each single battery are consistent, and it is considered that each single cell that forms the lithium-ion battery pack is in the same SOC state The OCV at the same time is also the same, that is, the SOC-OCV curves between the individual cells in the lithium-ion battery pack can overlap, and it is considered that the inc...

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Abstract

The invention provides a single cell capacity estimation method in a lithium ion battery pack. The implementation of the single cell capacity estimation method in the lithium ion battery pack is basedon a charging process of the lithium ion battery pack and a discharging process of the single cell; and N battery cells in the same aging state are contained in the lithium ion battery pack. The single cell capacity estimation method in the lithium ion battery pack comprises the following steps: taking a first fully charged single cell in the lithium ion battery pack as a reference battery, and calculating an approximate Q-OCV curve QV0 according to a charging and discharging curve; calculating the approximate Q-OCV curve QVi of an i-th cell whose capacity is to be estimated according to thecharging and discharging curve of the i-th cell whose capacity is to be estimated; performing differential calculation on the QV0 and the QVi separately to obtain capacity differential curves D0 and Di, normalizing the D0 and the Di, and translating the Di to coincide with the D0; recording the approximate OCVi of the charging cut-off time (the end point value of the curve) in the Di; calculatingan approximate SOC-OCV curve S0 of the reference battery according to the curve VQ0; determining a SOCi value corresponding to the OCVi in the curve S0; and calculating the actual capacity of the i-thsingle cell according to the partial discharging capacity of the i-th single cell and the SOCi value.

Description

technical field [0001] The invention belongs to the technical field of power batteries for vehicles and energy storage, and mainly relates to a method for estimating the capacity of a single battery in a lithium-ion battery pack. Background technique [0002] As the country vigorously advocates new energy, the development of electric vehicles has sprung up, becoming the best choice to replace traditional fuel vehicles. As the heart of electric vehicles, lithium-ion batteries play a decisive role in the mileage and power characteristics of electric vehicles. Battery capacity is an important indicator of battery performance and one of the important factors in determining the mileage of electric vehicles. Due to the demand for battery energy in electric vehicles, the batteries used in electric vehicles are in the form of battery packs formed by connecting a large number of single cells in parallel and in series. Therefore, knowing the available capacity of lithium-ion battery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/396
Inventor 张琳静张维戈张彩萍张言茹姜久春王占国龚敏明周兴振
Owner 徐州普瑞赛思物联网科技有限公司
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