Toggle Main Menu Toggle Search

Open Access padlockePrints

A cascaded transformer-based equalisation converter for series connected battery cells

Lookup NU author(s): summer Zhan, Dr Simon LambertORCiD, Professor Volker Pickert, Dr Haimeng Wu, Xiang Lu



This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by The Institution of Engineering and Technology, 2016.

For re-use rights please refer to the publisher's terms and conditions.


Hybrid electric vehicles (HEVs) and electric vehicles (EVs) have increased in popularity as they use rechargeable battery as energy source instead of petrol, furthermore, help to reduce the release of greenhouse gases. Generally, for applications such as EVs and HEVs, a battery pack may consist of hundreds individual cells batteries in order to meet voltage and energy capacity requirements. However, due to individual chemical characteristics and manufacturing tolerances each cell in a pack will have a slightly different capacity. The capacity of a cell also changes over time as the cell ages. During charging and discharging this leads to unbalanced voltages across the battery pack, and unchecked could result in over-charging/over-discharging for certain cells. This in turn can lead to cell and pack failure or even fire. Therefore, as part of the battery management system a process for voltage equalisation of cells throughout the stack is essential. This paper proposes a new cascaded multi-winding transformer based equalisation circuit topology which, compared to more traditional multi-winding transformerbased topologies is simpler in transformer construction and is therefore far easier to manufacture. The topology concept and operating principals are discussed followed by simulation results for the proposed system. In addition accelerated equalisation speed compared to existing solutions is demonstrated.keywords: {battery powered vehicles;hybrid electric vehicles;network topology;power convertors;transformers;HEV;battery management system;cascaded multiwinding transformer;cascaded transformer-based equalisation converter;equalisation circuit topology;hybrid electric vehicles;rechargeable battery;series connected battery cells;voltage equalisation;EVs;cascaded multi-winding transformer;voltage equalisation},

Publication metadata

Author(s): Zhan H, Xiang x, Lambert SM, Pickert V, Wu H, Lu X

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

Year of Conference: 2016

Pages: 6-6

Print publication date: 10/11/2016

Online publication date: 10/11/2016

Acceptance date: 19/04/2016

Date deposited: 02/12/2016

ISSN: 9781785611896

Publisher: The Institution of Engineering and Technology


Library holdings: Search Newcastle University Library for this item

Series Title: Power Electronics, Machines and Drives (PEMD 2016), 8th IET International Conference on

ISBN: 9781785611889