METHOD AND SYSTEM FOR MONITORING AND BALANCING CELLS IN BATTERY PACKS
First Claim
1. A system for balancing energy delivery devices within the one or more battery packs, comprising:
- at least one group of N energy delivery devices electrically connected in series, wherein N is an integer greater than one;
for each group of N energy delivery devices, a balancing circuit for each adjacent pair of energy delivery devices, wherein the balancing circuit adjusts charge stored in each energy delivery device of the adjacent pair so that (i) the charge stored in a first energy delivery device of the pair is substantially equal to a second energy delivery device of the pair, and (ii) the charge stored in each energy delivery device remains above a predetermined threshold.
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Accused Products
Abstract
A system for balancing energy delivery devices within the one or more battery packs and for providing isolated monitoring of the battery packs includes at least one group of energy delivery devices electrically connected in series. For each group of energy delivery devices, the system includes a balancing circuit for each adjacent pair of energy delivery devices. The balancing circuit adjusts charge stored in each energy delivery device of the pair so that the charge stored in the energy delivery devices of the pair is substantially equal, and the charge stored in each energy delivery device remains above a threshold. The system also includes a voltage monitoring module for sequentially selecting each of the energy delivery devices and providing a voltage associated with the selected device at an output port. The voltage monitoring module uses a low on-resistance differential multiplexer to select each of the energy delivery devices.
35 Citations
20 Claims
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1. A system for balancing energy delivery devices within the one or more battery packs, comprising:
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at least one group of N energy delivery devices electrically connected in series, wherein N is an integer greater than one; for each group of N energy delivery devices, a balancing circuit for each adjacent pair of energy delivery devices, wherein the balancing circuit adjusts charge stored in each energy delivery device of the adjacent pair so that (i) the charge stored in a first energy delivery device of the pair is substantially equal to a second energy delivery device of the pair, and (ii) the charge stored in each energy delivery device remains above a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for providing isolated monitoring of one or more battery packs, and for balancing energy delivery devices within the one or more battery packs, comprising:
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at least one group of N energy delivery devices electrically connected in series, wherein N is an integer greater than one; for each group of N energy delivery devices, a balancing module and a voltage monitoring module; wherein the balancing module includes a balancing circuit for each adjacent pair of energy delivery devices; wherein the balancing circuit adjusts charge stored in each energy delivery device of the adjacent pair so that (i) the charge stored in a first energy delivery device of the pair is substantially equal to a second energy delivery device of the pair, and (ii) the charge stored in each energy delivery device remains above a predetermined threshold; and
,wherein the voltage monitoring module includes; (i) a differential multiplexer, operating on split supply, for sequentially selecting each of the energy delivery devices presented to a plurality of input ports and providing a voltage associated with the selected energy delivery device at an output port, wherein the differential multiplexer is characterized by a low on-resistance path from the input ports to the output port; (ii) a resistor divider for scaling the voltage associated with the selected energy delivery device to produce a scaled voltage; (iii) an isolation amplifier for providing an isolated version of the scaled voltage; (iv) an isolated DC to DC converter for supplying power to an input side of the isolation amplifier, and (v) an output operational amplifier for impedance matching the scaled voltage to a system controller. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of balancing energy delivery devices within a battery pack, wherein the battery pack includes a group of N energy delivery devices electrically connected in series, N being an integer greater than one, comprising:
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for each adjacent pair of energy delivery devices within the battery pack, adjusting charge stored in each energy delivery device of the adjacent pair so that the charge stored in the energy delivery devices of the pair is substantially equal, and maintaining the charge stored in each energy delivery device above a predetermined threshold. - View Dependent Claims (18, 19, 20)
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Specification