Sensor system for measuring battery internal state
First Claim
1. A vehicle comprising:
- a battery storing electrical energy for an electric motor;
a tunneling magnetoresistance sensor connected to the battery, configured to receive a response signal from a surface-acoustic-wave sensor sensing strain at an anode of the battery representing ions thereat via tunneling magnetoresistance, and to wirelessly transmit an output signal indicating battery state using the response signal; and
control circuitry configured to control the electric motor and the battery based on the output signal.
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Accused Products
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 vehicle can also include control circuitry to receive the output signal and to control the electric motor and the battery. In examples, the battery may have a physical property that changes based on a state of the battery. This physical property may be measured by the sensor. The sensor may be passive and built into the structure of the battery. The sensor can be a magnetic field sensor or a surface wave acoustic sensor.
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Citations
11 Claims
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1. A vehicle comprising:
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a battery storing electrical energy for an electric motor; a tunneling magnetoresistance sensor connected to the battery, configured to receive a response signal from a surface-acoustic-wave sensor sensing strain at an anode of the battery representing ions thereat via tunneling magnetoresistance, and to wirelessly transmit an output signal indicating battery state using the response signal; and control circuitry configured to control the electric motor and the battery based on the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for detecting state of a battery comprising:
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wirelessly transmitting an input signal to the battery; receiving the input signal at a passive sensor connected to the battery; emitting a magnetic field at an electrode of the battery; sensing battery state using a tunneling magnetoresistance sensor in the magnetic field to sense permeability of a battery electrode; outputting a response signal that changes based on sensed permeability of the battery electrode; and outputting battery state based on the response signal, wherein the input signal includes an electromagnetic signal and the sensor is a surface wave acoustic sensor that senses strain at an electrode of the battery, and wherein outputting the response signal includes wirelessly outputting the response signal from the surface wave acoustic sensor to a receiver outside the battery. - View Dependent Claims (11)
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Specification