Lithium ion battery cell having a capacitance sensor and method for monitoring the condition of a lithium ion battery cell of this type
First Claim
1. A lithium ion battery cell, comprising:
- a graphite cathode;
an excess pressure valve configured to open in a presence of a predetermined battery cell internal pressure and discharging gasses produced inside the lithium ion battery cell, wherein graphite particles are entrained in the discharging gasses; and
at least one capacitor that is positioned in the lithium ion battery cell and configured such that;
the graphite particles are deposited at least in part in a gap located between two electrodes of the at last one capacitor; and
the graphite particles being deposited at least in part in the gap causes change in a dielectric value of in the gap, wherein the change in the dielectric value causes a change in a capacitance of the at least one capacitor.
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Accused Products
Abstract
A lithium ion battery cell includes a graphite cathode, and an excess pressure valve. The excess pressure valve is configured to open in the presence of a predetermined battery cell internal pressure and discharging gases that have been produced inside the battery cell. Such gases are discharged together with graphite particles entrained in the gas. The battery cell further includes a capacitance sensor that has at least one capacitor positioned in the battery cell and configured such that the graphite particles that are entrained in the gas that is being discharged deposit themselves at least in part in a gap that is located between two electrodes of the capacitor and cause a change in the dielectric value in the gap. The change in the dielectric value causes a change in a capacitance of the capacitor.
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Citations
10 Claims
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1. A lithium ion battery cell, comprising:
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a graphite cathode; an excess pressure valve configured to open in a presence of a predetermined battery cell internal pressure and discharging gasses produced inside the lithium ion battery cell, wherein graphite particles are entrained in the discharging gasses; and at least one capacitor that is positioned in the lithium ion battery cell and configured such that; the graphite particles are deposited at least in part in a gap located between two electrodes of the at last one capacitor; and the graphite particles being deposited at least in part in the gap causes change in a dielectric value of in the gap, wherein the change in the dielectric value causes a change in a capacitance of the at least one capacitor. - View Dependent Claims (2, 3, 4, 5)
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6. A method for monitoring a condition of a lithium ion battery cell that has a graphite cathode and an excess pressure valve, wherein graphite particles are entrained in discharging gasses produced inside the lithium ion battery cell, the method comprising:
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obtaining a measurement of a capacitance of at least one capacitor positioned in the lithium ion battery cell and configured such that the graphite particles are deposited at least in part in a gap located between two electrodes of the capacitor and cause a change in a dielectric value in the gap, wherein a change in the dielectric value causes a change in the capacitance; establishing a defective condition of the lithium ion battery cell in a presence of a change in the capacitance; and discharging defective condition gas out of the lithium ion battery cell through an open excess pressure valve, wherein the excess pressure valve is configured to open in a presence of a predetermined battery cell internal pressure and the discharging gasses. - View Dependent Claims (7, 8)
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9. A battery system comprising:
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a battery that includes a plurality of battery cells that respectively have; a graphite cathode; an excess pressure valve configured to open in a presence of a predetermined battery cell internal pressure and discharging gasses produced inside each battery cell, wherein graphite particles are entrained in the discharging gasses; and at least one capacitor that is positioned in each battery cell and configured such that; the graphite particles are deposited at least in part in a gap located between two electrodes of the at last one capacitor; and the graphite particles being deposited at least in part in the gap causes change in a dielectric value of in the gap, wherein the change in the dielectric value causes a change in a capacitance of the at least one capacitor; and a battery management system, wherein the battery system is configured to; recognize and identify, via the battery management system, any of the plurality of battery cells as being defective in a presence of a change in the capacitance of a respective battery cell; and discharge and bridge the respective battery cell that has been identified as defective. - View Dependent Claims (10)
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Specification