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Modeling changes in the state-of-charge open circuit voltage curve by using regressed parameters in a reduced order physics based model

A technology of battery packs and monomers, applied in the direction of measuring electric variables, batteries, measuring electricity, etc.

Inactive Publication Date: 2013-12-04
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no known method to use in-vehicle measurements and physics-based models to determine the actual physical state of the battery cells as the battery pack ages, including SOC-OCV curves

Method used

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  • Modeling changes in the state-of-charge open circuit voltage curve by using regressed parameters in a reduced order physics based model
  • Modeling changes in the state-of-charge open circuit voltage curve by using regressed parameters in a reduced order physics based model
  • Modeling changes in the state-of-charge open circuit voltage curve by using regressed parameters in a reduced order physics based model

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Embodiment Construction

[0045] The following description of embodiments of the invention, which relate to methods for modeling changes in a battery cell's state of charge versus open circuit voltage curve as the cell ages, is merely exemplary in nature and in no way It is intended to limit the invention or its application or use. For example, the following discussion refers to cells used in electric vehicle battery packs, but the approach is equally applicable to cells in other vehicular and non-vehicular applications.

[0046] Battery packs in electric vehicles and gasoline-electric or diesel-electric hybrid vehicles (hereinafter collectively referred to simply as "electric vehicles") typically include several hundred individual cells. In one popular lithium-ion rechargeable battery chemistry, each cell generates about 3.7 volts nominally, with the exact value depending on state of charge and other factors. Many cells connected in series in a module provide the high voltage required to drive electr...

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Abstract

A method for modeling changes in the state of charge vs. open circuit voltage (SOC-OCV) curve for a lithium-ion battery cell as it ages. During battery pack charging, voltage and current data are gathered for a battery cell. A set of state equations are used to determine the stoichiometry and state of charge of the cathode half-cell based on the charging current profile over time. The voltage and current data, along with the stoichiometry and state of charge of the cathode half-cell, are then used to estimate maximum and minimum solid concentration values at the anode, using an error function parameter regression / optimization. With stoichiometric conditions at both the cathode and anode calculated, the cell's capacity and a new SOC-OCV curve can be determined.

Description

technical field [0001] The present invention relates generally to determining the state of charge of a cell in a battery pack, and more particularly to a method of modeling changes in a cell's state of charge versus open circuit voltage profile as the cell ages, wherein using This curve is modeled based on regression or optimization of parameters in the physical model, and the resulting cell performance curve is used to improve the determination of the state of charge and the estimation of capacity. Background technique [0002] Electric vehicles and gasoline-electric or diesel-electric hybrid vehicles are rapidly gaining popularity in today's automotive market. Electric and hybrid electric vehicles offer several desirable features, such as reducing or eliminating consumer-level emissions and petroleum-based fuel consumption, and potentially reducing operating costs. A key subsystem of electric and hybrid electric vehicles is the battery pack, which can represent a signific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCY02T10/7011H01M10/44B60L11/18H01M2220/20G01R31/3675B60L11/1857H01M10/0525B60L2240/547B60L2240/549H01M10/482B60L11/1864G01R31/3651B60L11/1861H02J7/00G01R31/36B60L58/16B60L58/12B60L58/21G01R31/374G01R31/367Y02E60/10Y02T10/70
Inventor P.M.拉斯科夫斯基B.J.科赫D.R.弗里施R.雷巴K.M.约翰逊
Owner GM GLOBAL TECH OPERATIONS LLC
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