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Implementation of discharging/charging current sensorless state-of-charge estimator reflecting cell-to-cell variations in lithium-ion series battery packs

Chun, C. Y.; Cho, B. H.; Kim, J.

International journal of automotive technology. VOL 17; NUMBER 5, ; 2016, 909-916 -- Springer Science + Business Media (pages 909-916) -- 2016

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  • Title:
    Implementation of discharging/charging current sensorless state-of-charge estimator reflecting cell-to-cell variations in lithium-ion series battery packs
  • Author: Chun, C. Y.;
    Cho, B. H.;
    Kim, J.
  • Found In: International journal of automotive technology. VOL 17; NUMBER 5, ; 2016, 909-916
  • Journal Title: International journal of automotive technology.
  • Subjects: Electrical and Electronic Engineering; Mechanical Engineering; Civil Engineering; Dewey: 629.2
  • Publication Details: Springer Science + Business Media
  • Language: English
  • Abstract: This paper offers novel insights to the design and implementation of an innovative state-of-charge (SOC) estimator for the lithium-ion (Li-Ion) series battery pack. The most interesting feature of this approach is that it can utilize information from each filtered terminal voltage of the Li-Ion cells connected in series for SOC estimation of the battery pack. Without actual sensing each discharging/charging current (DCC) applied to the Li-Ion cells, it is possible to extract each DCC estimation from the corresponding filtered terminal voltages with an equivalent electrical circuit model (EECM) identification of all Li-Ion cells in the battery pack. There are two advantages to SOC estimation of the battery pack with this approach. First, the proposal can be implemented simply and effectively, reducing the computational steps required for SOC estimation. By reducing computational steps, the proposal is expected to be more cost-effective. Second, the approach guarantees an improved SOC performance, even if the battery pack results in inevitable cell-to-cell variation among Li-Ion cells. Accordingly, there are fewer differences to previously estimated DCCs among Li-Ion cells. Specifically, all values from the estimated DCCs are properly compensated for by simultaneous parameter modification according to each cell’s electrochemical characteristics. Experimental results clearly demonstrate that our DCC sensorless SOC estimator provides robust SOC performance for the battery pack. This approach considered an experimental battery pack (12S1P) connected in series using 2.6 Ah LiCoO2 cells produced by Samsung SDI.
  • Identifier: Journal ISSN: 1229-9138
  • Publication Date: 2016
  • Physical Description: Electronic
  • Shelfmark(s): 4542.125100
  • UIN: ETOCRN377799184

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