Signalling system
First Claim
1. A signalling system for use with a plurality of series connected battery cells, comprising:
- first and second cell signalling devices, each to be powered by a respective one or more of said plurality of battery cells; and
a communication link for connecting an output terminal of said first cell signalling device to an input terminal of said second cell signalling device;
characterised in that at least one of said first and second cell signalling devices comprises a DC level shift circuit which is operable (i) to receive signals transmitted from an adjacent cell signalling device;
(ii) to shift the DC level of the received signals; and
(iii) to output the level shifted signals for transmission to said communication link.
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Accused Products
Abstract
A battery signalling system is provided which can be used to monitor and/or control a battery (1) having a number of series connected battery cells (Ci) . When used to monitor the battery cells, the battery signalling system can comprise a central battery monitoring system (3) for monitoring the industrial battery (1) as a whole, a number of cell monitoring devices (CMi) for monitoring one or more battery cells (Ci) and a communication link (9) for connecting the cell monitoring devices (CMi) in series in a daisy chain configuration to the central battery monitoring system (3). In operation, the central battery monitoring system (3) can poll each of the cell monitoring devices (Cmi) in turn and analyze the data received from a polled cell monitoring device (CMi) to detect malfunctions and/or underperforming cells.
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Citations
42 Claims
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1. A signalling system for use with a plurality of series connected battery cells, comprising:
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first and second cell signalling devices, each to be powered by a respective one or more of said plurality of battery cells; and a communication link for connecting an output terminal of said first cell signalling device to an input terminal of said second cell signalling device; characterised in that at least one of said first and second cell signalling devices comprises a DC level shift circuit which is operable (i) to receive signals transmitted from an adjacent cell signalling device;
(ii) to shift the DC level of the received signals; and
(iii) to output the level shifted signals for transmission to said communication link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A signalling method using a plurality of series connected battery cells, comprising the steps of:
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providing a plurality of cell signalling devices and powering them with a respective one or more of said plurality of battery cells; providing a communication link for connecting said plurality of cell signalling devices in series; receiving signals transmitted from an adjacent cell signalling device; shifting the DC level of the received signals; and outputting the level shifted signals to the communication link.
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Specification