Modular, adaptable holders for sensors and battery cells for physical analysis
Systems and methods for battery testing including a holder system. The holder system is designed to couple one or more transducers to a battery under test, wherein the one or more transducers are configured for electrochemical-acoustic signal interrogation (EASI) of the battery. The holder system includes at least one arm to house at least one transducer to be coupled to the battery, and a pressure applying device to apply pressure to the at least one transducer, and to control pressure between the at least one transducer and the battery. The holder system is also configured to determine the pressure between the at least one transducer and the battery and adjust the pressure applied to the at least one transducer based on the determined pressure.
1. An apparatus comprising:
a holder system configured to couple one or more transducers to a battery, the one or more transducers configured for electrochemical-acoustic signal interrogation (EASI) of the battery, the holder system comprising:
at least one arm configured to house at least one transducer to be coupled to the battery;
a pressure applying device configured to apply pressure to the at least one transducer, to control pressure between the at least one transducer and the battery; and
a waveguide disposed between the battery and the at least one transducer.
2. The apparatus of claim 1 , wherein the at least one transducer is one of a transmitter or receiver of acoustic signals.
3. The apparatus of claim 2 further comprising an ultrasonic pulser and receiver, configured to transmit an acoustic pulse through a first transducer configured to transmit acoustic signals and receive the transmitted pulse through a second transducer configured to receive acoustic signals.
4. The apparatus of claim 3 wherein the first transducer is housed in a first arm and the second transducer is housed in a second arm, wherein the first arm and the second arm are independently moveable, and wherein the first arm and the second arm are disposed to be one of: coaxial or off-axis with respect to each other.
5. The apparatus of claim 3 wherein the first transducer and the second transducer are housed in a first arm.
6. The apparatus of claim 1 , wherein the pressure applying device comprises one or more of springs, pneumatic pressure mechanisms, lead screws, linear actuators, or electromagnetic solenoids.
7. The apparatus of claim 1 , further comprising a pressure adjusting device configured to adjust the pressure applied by the pressure applying device.
8. The apparatus of claim 7 , wherein the pressure adjusting device comprises one or more of:
a screw and bolt assembly disposed at an interface between the at least one transducer and the battery; or
a screw disposed at an outer side of the at least one transducer, the outer side opposite to the interface between the at least one transducer and the battery.
9. The apparatus of claim 7 , further comprising at least one pressure sensor configured to determine pressure between the at least one transducer and the battery, wherein the pressure adjusting device comprises one or more motorized linear actuators, linear stepper motors, motorized lead screws, computer-controlled actuators configured to apply adjustable pressure based on feedback from the at least one pressure sensor, computer-controlled pneumatic valves, computer-controlled pistons, or computer-controlled solenoids.
10. The apparatus of claim 1 , further comprising a strain gauge configured to determine strain at an interface between the at least one transducer and the battery.
11. The apparatus of claim 1 , wherein the pressure applying device comprises a gravity-assisted device comprising a fixed platform and a moveable platform, the moveable platform configured to apply pressure based on gravity, with the at least one arm coupled to the moveable platform.
12. The apparatus of claim 1 , wherein the battery comprises cells of one or more geometries including a pouch cell or a cylindrical cell.
13. The apparatus of claim 1 , wherein the holder system further comprises one or more of a slot to accommodate the battery, a slot to accommodate the battery, or one or more slots to accommodate one or more sensors.
14. The apparatus of claim 1 , further comprising a device for automatic, robotic, or computer-controlled placement of the arm with respect to the battery for precise alignment of the at least one transducer.
15. The apparatus of claim 14 , wherein the device comprises a conveyor belt configured to bring two or more batteries into contact with the at least one arm in a stepwise manner during a process of testing the two or more batteries.
16. The apparatus of claim 1 , further comprising a non-fluid couplant applied to the at least one transducer to improve mechanical contact between the at least one transducer and the battery.
17. The apparatus of claim 1 , further comprising a puck configured to maintain contact with a back surface of the at least one transducer and to distribute pressure at an interface between the at least one transducer and the battery.
18. The apparatus of claim 17 , wherein the puck comprises a slot to accommodate a piston of the pressure applying device.
19. The apparatus of claim 17 , wherein the puck is configured to house at least a back portion of the at least one transducer or wherein the puck comprises an appendage configured to fit around a cable fixture attached to the at least one transducer.
20. The apparatus of claim 1 , wherein the waveguide is configured to position the battery beyond a near field of the at least one transducer.
21. The apparatus of claim 20 , wherein the waveguide is a cylinder or block of length N and a diameter of the at least one transducer is D, with a speed of sound through the waveguide is c, and the at least one transducer is configured to transmit acoustic signals at a frequency ƒ, and wherein N=D 2 ƒ/4c.
22. A method of testing a battery, the method comprising:
coupling one or more transducers to the battery, the one or more transducers configured for electrochemical-acoustic signal interrogation (EASI) of the battery;
coupling the at least one arm to the battery, wherein at least one transducer is housed in the at least one arm;
applying pressure to the at least one transducer, to control pressure between the at least one transducer and the battery; and
disposing a waveguide between the battery and the at least one transducer.
23. The method of claim 22 , further comprising determining the pressure between the at least one transducer and the battery and adjusting the pressure applied to the at least one transducer based on the determined pressure.
24. The method of claim 22 , further comprising precisely aligning the arm with respect to the battery based on automatic, robotic, or computer-controlled mechanisms.
25. The method of claim 24 , comprising placing two or more batteries on a conveyor belt and bringing the two or more batteries into contact with the at least one arm in a stepwise manner.
26. The method of claim 22 , further comprising applying a couplant to the at least one transducer to improve mechanical contact between the at least one transducer and the battery.
27. The method of claim 22 , further distributing pressure at an interface between the at least one transducer and the battery based on configuring a puck in contact with a back surface of the at least one transducer.
28. The method of claim 22 , wherein disposing the waveguide between the battery and the at least one transducer includes positioning the battery beyond a near field of the at least one transducer.
29. A battery holder system comprising:
means for housing at least one transducer to be coupled to a battery under test, the at least one transducers configured for electrochemical-acoustic signal interrogation (EASI) of the battery;
means for applying pressure to the at least one transducer for controlling pressure between the at least one transducer and the battery; and
means for positioning the battery beyond a near field of the at least one transducer.
30. The battery holder system of claim 29 , further comprising means for determining the pressure between the at least one transducer and the battery and means for adjusting the pressure applied to the at least one transducer based on the determined pressure.
31. An apparatus comprising:
a holder system configured to couple one or more transducers to a battery, the one or more transducers configured for electrochemical-acoustic signal interrogation (EASI) of the battery, the holder system comprising:
at least a first arm configured to house at least a first transducer configured to transmit an acoustic pulse and a second arm configured to house at least a second transducer configured to receive the transmitted pulse, the first transducer and the second transducer to be coupled to the battery, wherein the first arm and the second arm are independently moveable; and
a pressure applying device configured to apply pressure to the at least one transducer, to control pressure between the at least one transducer and the battery.
32. The apparatus of claim 31 , wherein the first arm and the second arm are disposed to be one of: coaxial or off-axis with respect to each other.