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Battery Electrolyte Level Detector Apparatus

An apparatus has been developed for checking the electrolyte level in a battery, providing a safer and more efficient means to do so. The result is a non-intrusive apparatus and method of checking the electrolyte level that reduces the need to open the caps on the battery by checking the level externally.

The apparatus comprises elements such as a frame that is engageable with the battery, and a first and second micrometer carried by the frame. The first and second micrometers may slide along the frame with respect to each other to adjust to the size of the battery. Other elements of the detector comprise an acoustic transmitter supported on a transmitter rod, which may be slidably mounted with respect to the first micrometer so that the first micrometer is operable to measure a position of the slidable transmitter rod for placement of the acoustic transmitter adjacent to a desired level of electrolyte within the battery. Similarly, an acoustic receiver is supported on a receiver rod.

Electronic receiver circuitry is operable to distinguish between an acoustic signal that passes through air, indicating a low level of electrolyte within the battery, and an acoustic signal that passes through fluid, indicating a satisfactory level of electrolyte within the battery. The electronic receiver circuitry comprises first and second bandpass filters operably connected to the acoustic receiver. The first bandpass filter is operable for passing an electrical signal indicative of a satisfactory level of the electrolyte within the battery. The second filter is operable for passing an electrical signal indicative of a low level of electrolyte within the battery.

The apparatus also features an acoustic transmitter director for directing acoustic transmitter energy. The transmitter director comprises a first transmitter socket cup positioned adjacent to a second transmitter socket cup. The first transmitter socket cup may be larger in size than the second. The second transmitter socket cup and the second receiver socket cup are positioned to contact the battery.

The first and second micrometers can be pivotally mounted to the frame for stowage of the electrolyte level detector in a compact position. The apparatus comprises a handle connectable to the transmitter rod and the receiver rod, operable for simultaneous movement of the transmitter rod and the receiver rod.

This work was done by Nathan Johnnie of the Naval Undersea Warfare Center. For more information, download the Technical Support Package (free white paper) at www.defensetechbriefs.com/tsp  under the Physical Sciences category. NUWC-0009

Topics:
Acoustics Batteries Body structures Electrical systems Electrolytes Energy storage systems Frames Logistics Physical Sciences
This Brief includes a Technical Support Package (TSP).
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Battery Electrolyte Level Detector Apparatus

(reference NUWC-0009) is currently available for download from the TSP library.

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    Defense Tech Briefs Magazine

    This article first appeared in the October, 2010 issue of Defense Tech Briefs Magazine (Vol. 4 No. 5).

    Read more articles from this issue here.

    Read more articles from the archives here.

    Overview

    The document describes a patent application for a battery electrolyte level detector apparatus developed by the Naval Undersea Warfare Center. This invention addresses the need for efficient and accurate monitoring of electrolyte levels in batteries, particularly in various military and civilian applications, including submarines, surface ships, and other vehicles that utilize different types of batteries such as lead-acid and rechargeable batteries.

    The background section highlights the importance of regularly checking electrolyte levels in batteries, especially lead-acid batteries, where water is lost due to evaporation and electrolysis during normal operation. The invention aims to provide an external apparatus that simplifies this monitoring process, enhancing safety and efficiency.

    The invention features a transducer assembly that can be attached to the exterior of a battery reservoir at selectable locations. This assembly monitors changes in liquid height and conveys signals to a monitor, alerting users when the electrolyte level is low, thereby preventing battery damage due to insufficient electrolyte. The assembly can be secured using various methods, including straps, clamps, or adhesive materials, allowing for flexible placement along the reservoir.

    Additionally, the document references a non-contact ultrasonic system for measuring liquid volume in containers, which operates by sending ultrasonic pulses to the liquid's surface and measuring the time it takes for the echoes to return. This technology can be adapted for use in the electrolyte level detector, providing accurate measurements based on the container's dimensions and the transit time of the ultrasonic signals.

    The invention is positioned as a significant advancement in battery maintenance technology, offering a reliable solution for monitoring electrolyte levels without the need for direct contact with the battery's internal components. This is particularly beneficial in military applications where battery reliability is critical.

    In conclusion, the patent application outlines a novel approach to battery electrolyte level detection that enhances operational safety and efficiency. The technology has potential applications across a wide range of vehicles and machines, making it a valuable asset for both military and civilian sectors. The document emphasizes the government's interest in the invention, indicating that it may be utilized for governmental purposes without royalty payments.

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