Information handling system with battery protected from non-permanent failures
First Claim
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1. A battery coupled to an electrical device via a positive and negative battery terminals, the battery comprising:
- a cell stack operable to store a charge received through the battery terminals from the device;
a sense resistor for measuring a current through the cell stack, wherein the sense resistor is electrically coupled to the stack;
a ground switch coupled in series with a negative line of the cell stack and the negative battery terminal and operable to control the current; and
a controller operable to control the ground switch in response to receiving an input indicative of the current, wherein the ground switch is operable to interrupt the current to the device in response to a transient failure event causing the current to be greater than a predefined value during a portion of a predefined time interval, and to enable the current to the device in response to a removal of the transient failure event causing the current to fail to be higher than the predefined value during another portion of the predefined time interval.
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Abstract
In a method and system for protecting a battery being charged by an electrical device, a current flowing through a cell stack of the battery is measured. If the measured current is greater than a predefined value the battery is isolated from the device. If subsequent current measurements made within a predefined time interval indicate that the measured current is less than or equal to the predefined value then the battery is recoupled to the device. If the measured current remains greater than the predefined value during the predefined time interval then a fuse is blown and the battery is disabled.
34 Citations
19 Claims
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1. A battery coupled to an electrical device via a positive and negative battery terminals, the battery comprising:
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a cell stack operable to store a charge received through the battery terminals from the device; a sense resistor for measuring a current through the cell stack, wherein the sense resistor is electrically coupled to the stack; a ground switch coupled in series with a negative line of the cell stack and the negative battery terminal and operable to control the current; and a controller operable to control the ground switch in response to receiving an input indicative of the current, wherein the ground switch is operable to interrupt the current to the device in response to a transient failure event causing the current to be greater than a predefined value during a portion of a predefined time interval, and to enable the current to the device in response to a removal of the transient failure event causing the current to fail to be higher than the predefined value during another portion of the predefined time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for protecting a battery being charged by an electrical device, the method comprising:
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measuring a current through the battery; determining whether the current is above a predefined value; isolating the device from the battery in response to a transient failure event causing the current to be above the predefined value during a portion of a predefined time interval, wherein the isolating is performed by a switch coupled in series with a negative line of a cell stack in the battery and a negative battery terminal; determining whether the current remains above the predefined value during the predefined time interval; and after the device has been isolated from the battery in response to the current being above the predefined value, recoupling the device to the battery in response to the current failing to be above the predefined value during another portion of the predefined time interval. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An information handling system (IHS) comprising:
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a processor; and a power supply operable to provide power to the processor, wherein the power supply includes; a charger operable to provide a charge; and a battery operable to receive the charge from the charger via a pair of terminals, wherein the battery includes; a cell stack operable to store the charge received from the charger through the terminals; a sense resistor for measuring a current through the cell stack, wherein the sense resistor is electrically coupled to the stack; a ground switch coupled in series with a negative line of the cell stack and a negative battery terminal and operable to control the current; and a controller operable to control the ground switch in response to receiving an input indicative of the current, wherein the ground switch is operable to interrupt the current to the charger in response to a transient failure event causing the current to be greater than a predefined value during a portion of a predefined time interval, and after removal of the transient failure event within the predefined time interval causes the current to fail to be higher than the predefined value during another portion of the predefined time interval, to enable the current to the charger. - View Dependent Claims (18, 19)
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Specification