Battery management system
First Claim
1. A battery management system for a rechargeable battery, comprising:
- a charger unit capable of providing a charge current to charge the rechargeable battery;
a load capable of receiving a discharge current from the rechargeable battery;
an integrated power and sense device including a power device and a sense device, the integrated power and sense device coupled between the rechargeable battery, the load, and the charger unit wherein;
the sense device provides a first mirror current proportional to the charge current flowing into the battery from the charger unit and a second mirror current proportional to the discharge current from the rechargeable battery; and
the power device is configured to disconnect the rechargeable battery from the charger and the load upon receipt of a disconnect signal; and
a battery management unit coupled to the integrated power and sense device, the battery management unit operable to;
use the first and second mirror currents to measure charge flowing into and out of the rechargeable battery and determine a total charge of the rechargeable battery.
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Accused Products
Abstract
A battery management system is provided having a battery management unit (BMU) and an integrated switch and sense device (SSD) for accurately measuring the charge state of a rechargeable battery and providing charge protection for the rechargeable battery. The system includes a load, a integrated power and sense device including a power device and a sense device, the integrated power and sense device connected between the rechargeable battery and the load wherein the sense device provides a mirror current proportional to the current in the power device, a first circuit that measures the rechargeable battery current using the mirror current, and a second circuit that measures the charge in the rechargeable battery using the mirror current.
58 Citations
21 Claims
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1. A battery management system for a rechargeable battery, comprising:
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a charger unit capable of providing a charge current to charge the rechargeable battery;
a load capable of receiving a discharge current from the rechargeable battery;
an integrated power and sense device including a power device and a sense device, the integrated power and sense device coupled between the rechargeable battery, the load, and the charger unit wherein;
the sense device provides a first mirror current proportional to the charge current flowing into the battery from the charger unit and a second mirror current proportional to the discharge current from the rechargeable battery; and
the power device is configured to disconnect the rechargeable battery from the charger and the load upon receipt of a disconnect signal; and
a battery management unit coupled to the integrated power and sense device, the battery management unit operable to;
use the first and second mirror currents to measure charge flowing into and out of the rechargeable battery and determine a total charge of the rechargeable battery. - View Dependent Claims (2, 3, 4)
a first circuit operable to measure the charge current and discharge current using the first and second mirror currents, and a second circuit operable to measure the charge of the rechargeable battery without using a time base.
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4. The battery management system of claim 3, wherein the second circuit includes a capacitor to continuously integrate the first or second mirror current to measure the rechargeable battery charge without a time period for sampling.
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5. A battery management system for a rechargeable battery, comprising:
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a load capable of receiving a rechargeable battery current from the rechargeable battery;
an integrated power and sense device including a power device and a sense device, the integrated power and sense device connected between the rechargeable battery and the load wherein the sense device provides a mirror current proportional to the rechargeable battery current;
a first circuit that measures the rechargeable battery current using the mirror current; and
a second circuit that measures a charge in the rechargeable battery using the mirror current. - View Dependent Claims (6, 7, 8, 9)
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10. A battery management system for a rechargeable battery having current flowing into and out of the rechargeable battery, comprising:
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a load;
a charger;
a bi-directional integrated power and sense device including first and second power devices and first and second sense devices, the bi-directional integrated power and sense device connected between the rechargeable battery and the load wherein the first sense device provides a first mirror current proportional to the current in the first power device and the second sense device provides a second mirror current proportional to the current in the second power device;
a first circuit that uses the first and second mirror currents to measure the currents flowing into and out of the rechargeable battery; and
a second circuit that uses the first and second mirror currents to measure a charge in the rechargeable battery. - View Dependent Claims (11, 12, 13, 14)
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15. A method of measuring a charge in a rechargeable battery, comprising the steps of:
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providing a mirror current proportional to a current flowing into or out of the rechargeable battery; and
integrating the mirror current to measure the charge in the rechargeable battery. - View Dependent Claims (16, 17)
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18. A method of disconnecting a rechargeable battery from a load or a charger, comprising the steps of:
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providing a mirror current proportional to a current flowing into or out of the rechargeable battery;
measuring the current flowing into or out of the rechargeable battery using the mirror current;
comparing the current flowing into or out of the rechargeable battery with a threshold value; and
disconnecting the rechargeable battery from a load or a charger based on the comparison of the current to the threshold value. - View Dependent Claims (19)
measuring the voltage of the rechargeable battery using the mirror current;
comparing the voltage to a threshold value; and
disconnecting the rechargeable battery based on the comparison of the voltage to the threshold value.
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20. A battery management method comprising the steps of:
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providing an integrated power and sense device;
generating a mirror current using the integrated power and sense device;
measuring charge using the integrated power and sense device and the mirror current; and
disconnecting a rechargeable battery using the integrated power and sense device.
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21. A battery management method comprising:
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generating a mirror current proportional to a current flowing into or out of a rechargeable battery;
providing the mirror current to a capacitor; and
continuously integrating the mirror current using the capacitor to measure a charge level of the rechargeable battery.
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Specification