Systems and methods for monitoring batteries in user devices

A system for monitoring a battery within a user device, the system comprising:

• a micro-electro-mechanical system (MEMS) ultrasound source and a MEMS ultrasound sensor that are each included within the user device and are disposed against the battery;
• and
• one or more computing units comprising a battery management system, a signal drive and acquisition module (SDM), and a processor,
• wherein the SDM includes a controller, a memory, an excitation module, and a receiver module,
• wherein the excitation module is configured by the controller to transmit an excitation signal to the MEMS ultrasound source, the MEMS ultrasound source is configured to transmit an ultrasound pulse into the battery in response to receiving the excitation signal, and the MEMS ultrasound sensor is configured by the controller to detect the ultrasound pulse from the battery and to generate a response signal associated with the detected ultrasound that is received by the receiver module;
• wherein the processor is configured to access the receiver module, analyze the response signal, and determine different states of the battery in response to the analysis, the determined states including an instantaneous thickness measurement of the battery, and
• wherein the one or more computing units are configured to:
• compare the determined instantaneous thickness measurement to one or more predetermined thresholds;
• and
• adjust operation of the battery responsive to the comparison.