Battery Cell Monitoring Unit

The proposed cell monitoring unit for sensing voltage, current, and temperature in a 12-cell 18650 lithium-ion battery module aims to be low-power, serving as the core of an energy-efficient battery management system and facilitating battery management functions with cell data. Notable features include a switchable voltage divider, a single op-amp differential amplifier and level shifter, and a high-precision composite amplifier. The proposed circuit is implemented on a printed circuit board. Measurement results show that the highest power dissipation under continuous operation is from the current sensing circuit at 6.03 mW under a 4 A string current, followed by the voltage sensing at 2.52 mW for the top cell and the temperature sensing at 34.9 μW. The measured power figures include the power dissipation from the battery cells in addition to the cell monitoring unit. The maximum output error is 68 mV for cell voltages up to 44.4 V, 36 mA for current up to 4 A, and 0.37 ◦C for temperature up to 73 ◦C.

Name thesis:degree_name

M.S.

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Electrical Engineering

Department dc:contributor.department

Electrical and Computer Engineering

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

2023

Author dc:creator

• Danson, Eric C.

Chair dc:contributor.committeechair

• Ha, Dong S.

Committee members dc:contributor.committeemember

• Walling, Jeffrey S.
• Sable, Dan M.

• Cell monitoring unit (CMU)
• Battery management system (BMS)
• Lithium-ion

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/10919/115066

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/115066