Sensor system for measuring battery internal state
First Claim
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1. A vehicle comprising:
- an electric motor;
a battery to store electrical energy for the electric motor; and
a surface acoustic wave sensor to wirelessly sense a magnetic field of the battery and temperature of the battery, the sensor including a magnetic field reactive device to change a surface wave in response to the magnetic field as a function of lithiation at an electrode of the battery.
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Abstract
Systems and methods for sensing internal states of vehicle batteries are described. From this internal state information, various physical characteristics of the battery can be measured, calculated or inferred. A vehicle can include an electric motor, a battery to store electrical energy for the electric motor, and a sensor connected to the battery to sense a battery state, to receive an input signal, and to wirelessly transmit an output signal indicating the battery state. The sensor may be passive and built into the structure of the battery. The sensor can be a surface wave acoustic sensor with a magnetic field sensor, which can be a magnetoimpedance sensing device and a temperature sensor.
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Citations
20 Claims
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1. A vehicle comprising:
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an electric motor; a battery to store electrical energy for the electric motor; and a surface acoustic wave sensor to wirelessly sense a magnetic field of the battery and temperature of the battery, the sensor including a magnetic field reactive device to change a surface wave in response to the magnetic field as a function of lithiation at an electrode of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A battery monitoring system comprising:
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a surface acoustic wave sensor to wirelessly sense a state of a battery and having a magnetic field sensing device to modify a SAW signal based on a magnetic field at a battery electrode, a temperature sensor to sense temperature at a battery, and a transducer to wirelessly output an output signal including temperature and battery state; and control circuitry to convert the sensed magnetic field to an output voltage signal. - View Dependent Claims (13, 14, 15)
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16. A battery monitoring system comprising:
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a surface acoustic wave sensor to wirelessly sense a state of a battery and having a magnetic field sensing device to modify a SAW signal based on a magnetic field at a battery electrode, a temperature sensor to sense temperature at a battery, and a transducer to wirelessly output an output signal including temperature and battery state; and control circuitry to convert the sensed magnetic field to an output voltage signal, wherein the surface acoustic wave sensor includes a plurality of acoustic reflectors, and the magnetic field sensing device includes a giant magnetoimpedance (GMI) thin film connected to at least one of the acoustic reflectors. - View Dependent Claims (17, 18, 19, 20)
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Specification