Oxis Energy Limited

Johnson Matthey Inc.

Gelion Technologies Pty Ltd

Christopher Hale

Rajlakshmi Purkayastha

An interconnection for a battery comprising a plurality of cells, the interconnection comprising: an electrically insulating substrate having a first face and a second face; a heat sink on the first face of the substrate; and a layer of electrically conducting material on the second face of the substrate, said layer of electrically conducting material providing one or more cell-receiving regions for connection with the plurality of cells.

Interconnection

A battery management system for a battery comprising at least one lithium sulphur battery cell. The battery management system comprising: a charging module operable to charge a lithium sulphur battery cell of the battery by delivering a pulsed charging current to the battery cell and to vary the duty cycle of the pulsed charging current so as to reduce the duty cycle of the pulsed charging current during charging of the battery cell.

Battery management

Apparatus for monitoring relative capacity and state of charge between at least two cells, or cell modules, A and B of a plurality of Lithium Sulfur cells arranged in series, comprising: a timer; a voltage monitoring module configured to monitor a voltage drop across each of the Lithium Sulfur cells or cell modules arranged in series based on signals received from a voltage monitoring circuit; and a cell monitoring module coupled to the timer and the voltage monitoring module and configured to, during a charging cycle in which the cells are charged at a constant current: record a time stamp T(Cell A) at which the monitored voltage of the first cell, cell A, leading the charging reaches a first voltage V(cell A) set to be near top of charge as the rate of change of the monitored voltage measurably increases; record a time stamp T(Cell B) at which the monitored voltage of the cell B following the charging reaches the first voltage V(Cell A); record a time stamp T(Cell A) at which the monitored voltage of the leading cell A reaches a second voltage V(Cell A) set to be substantially at a deemed top of charge; record a monitored voltage V(Cell B) of the following cell B at T(Cell A); and determine, based on at least T(Cell A), T(Cell B), V(Cell A) and V(Cell B), a metric indicative of a relative capacity difference between cell A and cell B.

Monitoring and balancing capacity in lithium sulfur cells arranged in series

A battery management system for determining a time series of normalised voltage of at least one battery cell corresponding to a time period during which a first current flows through the at least one battery cell. The battery management system comprises a cell monitoring device configured to measure a current flowing through the at least one battery cell and a voltage of the at least one battery cell at a plurality of different times during the time period; and a controller configured to determine a normalised voltage of the at least one battery cell for each of the plurality of different times, in dependence on the measured current and measured voltage corresponding to that time, wherein the determined normalised voltages at the plurality of different times form a times series of normalised voltage, wherein the normalised voltage at each of the plurality of different times corresponds to an estimate of a voltage of the at least one battery cell if a second constant current were flowing through the battery cell throughout the time period, where the second constant current is different to the first current.

Battery management system and method

A battery management system () for a battery () comprising a plurality of battery cells () connected in parallel with each other. The battery management system comprises an electronic circuit () for connection across at least one of the plurality of battery cells. The electronic circuit comprises a charge storage device () and a switching device (). The switching device switches the circuit between a first state in which charge is discharged from the at least one battery cell and directed to the charge storage device and a second state in which charge is discharged from the charge storage device and directed to the at least one battery cell. The switching device is arranged to repeatedly switch the circuit between the first state and the second state to cause the at least one battery cell to undergo pulsed charging and discharging to and from the charge storage device.

There is provided a Lithium-Sulfur battery management system for determining a state of charge of a Lithium-Sulfur battery (LS). The management system comprises a first circuit having at least one reactive element (Cb), and the first circuit is configured to discharge and charge fixed amounts of charge from and to the battery (LS) via the at least one reactive element (Cb). The management system also comprises a second circuit (DA, MC) for monitoring the discharging and charging, and the second circuit is configured to measure the discharge time and the charge time of the fixed amounts of charge, and determine the state of charge based on those times. There is further provided a method for determining the state of charge of the Lithium-Sulfur battery.

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Abingdon, United Kingdom

Christopher Hale