Invention Reference Number
Knowing the state of charge of lithium-ion batteries, used to power applications from electric vehicles to medical diagnostic equipment, is critical for long-term battery operation. Existing methods to estimate the state of charge and health using a battery management system (BMS) are time consuming and require extra hardware. This technology is an ultrasonic nondestructive testing method to estimate the state of charge of Li-ion batteries using second harmonic generation for almost instant results.
Description
One of the most important features of a battery management system (BMS) is the ability to estimate the state of charge of batteries without discontinuing the power supply or destroying the battery structure. This is especially true for online estimation of state of charge. Typical BMS-based estimation requires a long time to execute, or requires advanced algorithms with expensive hardware and complex software. In contrast to BMS systems, this invention is a quick, economical and simple system for state of charge estimation of lithium-ion batteries. The technology, based on ultrasonic nondestructive testing, gives results in seconds. There is no need to connect or reconnect to the battery to charge and discharge for several hours to estimate the state of charge. This ultrasound method results in measurement of a second harmonic, which can be analyzed to quantify the state of charge.
Benefits
- Fast, inexpensive; saves time and money
- Does not destroy the battery; sensors attach outside battery
- No waiting for charging and discharging
- Online state of charge and health estimates
- Portable, system fits in a briefcase-sized container
- Can help determine which batteries can be reused or recycled
- High accuracy
Applications and Industries
- Battery manufacturers
- Electric vehicle manufacturers
- Power grid operators
- Medical and other critical equipment manufacturers
Contact
To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.
