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1. (WO2016055806) ELECTRICAL ENERGY STORAGE DEVICE

Pub. No.:    WO/2016/055806    International Application No.:    PCT/GB2015/052967
Publication Date: Fri Apr 15 01:59:59 CEST 2016 International Filing Date: Sat Oct 10 01:59:59 CEST 2015
IPC: H02J 7/00
Applicants: OXFORD UNIVERSITY INNOVATION LIMITED
Inventors: BIRKL, Christoph
FROST, Damien
RICHARDSON, Robert
BIZERAY, Adrien
HOWEY, David
Title: ELECTRICAL ENERGY STORAGE DEVICE
Abstract:
An electrical energy storage device comprising: a plurality of energy cell slots for receiving energy cells (120); and a controller (130); wherein the controller is arranged to estimate a characteristic of a cell in each slot; and wherein the controller is arranged to apply charge and discharge currents to each cell slot dependent upon at least one estimated characteristic currently associated with that slot. The controller may be a single controller that controls all slots or it may be implemented as multiple controllers each controlling more than one cell slot or a controller for each slot. The characteristic may be one or more of: a power capability, a storage capacity, a cell impedance, an energy cell type and an energy cell chemistry. By estimating characteristics of the energy cells connected to the energy storage device, the system can adjust the charging/discharging currents applied to each cell to make the best use of the attached cells. Energy storage cells can vary greatly; rechargeable battery cells have high energy storage capacity, but lower power capabilities while super capacitors have lower energy storage capacity, but much higher power capabilities. Combinations of different types of cell are possible. To make optimal use of different cells, different charge/discharge currents may be applied. E.g.higher charge/discharge currents for super capacitors than rechargeable batteries. For combinations of batteries and super capacitors, it may be desirable (to limit battery degradation) initially to direct more current into the super capacitors to fully charge them before charging the rechargeable battery cells at a slower rate. During discharge, the higher power capability of the super capacitors allows them to handle power spikes and thus the controller may only drawon them when the power requirements exceed the capabilities of the rechargeable battery cells.