Mather, R;
Brett, D;
Tranter, T;
Whiteley, M;
Weaving, JS;
Neville, T;
Shearing, P;
(2021)
Current Imbalance in Parallel Battery Strings Measured Using a Hall‐Effect Sensor Array.
Energy Technology: generation, conversion, storage, distribution
, 9
(4)
, Article 2001014. 10.1002/ente.202001014.
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Abstract
Individual cell currents in parallel connected battery strings have been measured using micro Hall‐effect sensors. Cells are routinely connected in electrical series and parallel to meet the power and energy requirements of automotive and consumer electronics applications. Cells connected in series have been extensively studied, however, cells in parallel are often assumed to be a ‘black‐box’ in battery management systems. Poor pack design can result in positive feedback between current and temperature differentials along the parallel string driving greater levels of heterogeneous behaviour and uneven degradation. In this work, a non‐invasive multi‐sensor array board using Hall‐effect sensors is used to individually record the current passing through 8 parallel connected cells in two different electrical configurations, showing highly heterogeneous current distribution. Characteristic ‘waves’ of current and temperature are found to propagate along the parallel battery string and cell rebalancing was found to occur over hundreds of seconds with individual cell currents of up to 1C rate.
| Type: | Article |
|---|---|
| Title: | Current Imbalance in Parallel Battery Strings Measured Using a Hall‐Effect Sensor Array |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/ente.202001014 |
| Publisher version: | https://doi.org/10.1002/ente.202001014 |
| Language: | English |
| Additional information: | © 2021 The Authors. Energy Technology published by Wiley-VCH GmbH.This is an open access article under the terms of the Creative CommonsAttribution License, which permits use, distribution and reproduction inany medium, provided the original work is properly cited. |
| Keywords: | automotive batteries, battery management systems, cell rebalancing, current imbalance, Hall-effect sensors, lithium-ion cells, parallel cells |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10121967 |
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