BATTERY IMPEDANCE DETECTION SYSTEM, APPARATUS AND METHOD
First Claim
1. An energy storage cell apparatus, comprising:
- a current injection circuit configured to separately inject current into individual ones of a plurality of battery cells configured to store energy;
an impedance-detection circuit coupled to detect an impedance characteristic of each of the plurality of battery cells responsive to the injected current therein;
a filter circuit coupled to the impedance-detection circuit and configured toreceive high-bandwidth impedance data regarding the detected impedance characteristic from the impedance-detection circuit, andseparate low-frequency components of the impedance data from higher-frequency components of the impedance data;
a memory circuit configured to store data corresponding to the high-bandwidth components; and
an access circuit configured to provide the low-frequency components for the plurality of battery cells to a battery pack controller, and to access and provide the stored high-bandwidth components for a subset of the individual battery cells to the battery pack controller based upon available bandwidth for communicating the high-bandwidth components.
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Accused Products
Abstract
Various aspects of the present disclosure are directed to monitoring battery cells. In accordance with various embodiments, an energy storage cell apparatus includes a current injection circuit that separately inject current into individual ones of a plurality of battery cells that store energy, and an impedance-detection circuit detects an impedance characteristic of each of the plurality of battery cells in response to the injected current. A filter circuit receives impedance data regarding the detected impedance characteristic and separates low-frequency components of the impedance data from high-frequency components of the impedance data. A memory circuit stores data corresponding to high-bandwidth data including both the low-frequency components and the high-frequency components, and an access circuit provides the low-frequency components for the plurality of battery cells to a battery pack controller. The access circuit further accesses and provides the stored high-bandwidth data for a subset of the individual battery cells to the battery pack controller based upon available bandwidth for communicating the high-bandwidth data.
27 Citations
20 Claims
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1. An energy storage cell apparatus, comprising:
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a current injection circuit configured to separately inject current into individual ones of a plurality of battery cells configured to store energy; an impedance-detection circuit coupled to detect an impedance characteristic of each of the plurality of battery cells responsive to the injected current therein; a filter circuit coupled to the impedance-detection circuit and configured to receive high-bandwidth impedance data regarding the detected impedance characteristic from the impedance-detection circuit, and separate low-frequency components of the impedance data from higher-frequency components of the impedance data; a memory circuit configured to store data corresponding to the high-bandwidth components; and an access circuit configured to provide the low-frequency components for the plurality of battery cells to a battery pack controller, and to access and provide the stored high-bandwidth components for a subset of the individual battery cells to the battery pack controller based upon available bandwidth for communicating the high-bandwidth components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for monitoring a battery pack having a plurality of battery cells connected in series, the system comprising:
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a current injection circuit configured to separately inject current into individual ones of the plurality of battery cells; a cell voltage detection circuit configured to provide, for each of the battery cells, impedance data including low-frequency and high-frequency components indicative of cell voltage of the battery cell, in response to the injected current; a pack current detection circuit configured to provide impedance data including low-frequency and high-frequency components indicative of voltage on a resistor circuit that is connected in series with the battery cells, and therein providing an indication of current through the battery cells; a memory circuit configured to store data corresponding to high-bandwidth data including both the low-frequency and high-frequency components; a communications bus; and a battery pack controller configured to, via the communications bus, receive the provided low-frequency components for the plurality of battery cells from each of the cell voltage and pack current detection circuits, and access the memory circuit to retrieve the stored high-bandwidth data for a subset of the individual battery cells, based upon available bandwidth for communicating the high-bandwidth data. - View Dependent Claims (17, 18)
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19. A method for monitoring a battery pack having a plurality of battery cells connected in series, the method comprising, in a battery pack circuit:
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separately injecting current into individual ones of the plurality of battery cells; providing, for each of the battery cells, an output indicative of cell voltage of the battery cell responsive to the current injected into the battery cell; providing an output indicative of current through each of the battery cells; separating low-frequency components of the impedance data from high-frequency components of the impedance data; storing high-bandwidth data corresponding to the low-frequency components and the high-frequency components; providing the low-frequency components for the plurality of battery cells to a battery pack controller; and providing the high-bandwidth data for a subset of the individual battery cells to the battery pack controller, based upon an available bandwidth for communicating the high-bandwidth data. - View Dependent Claims (20)
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Specification