Battery Evaluation Laboratory
The UMASS Lowell Battery Evaluation Laboratory has a complete battery test system. The equipment is designed to test single cells or entire battery modules ranging from 2 to 12 Volts at 1mA to 320 Amps. Stand-alone and conputer-controlled sources and loads are included. The current regulators are capable of current sinking or sourcing and can change from charge to discharge mode instantaneously. Both continuous and pulse charging and discharging algorithms using active loads can be implemented by the data aquisition and control system. The data acquisition and control system consists of the following:
The following tests can be conducted:
The Off Board Electric Vehicle Battery Management System, currently being fabricated, consists of 24 controllers of the type previously described and is used to measure individual battery parameters and to balance individual batteries within a pack. The system is computer controlled and can be programmed to automatically rejuvenate batteries in an electric vehicle, charge and discharge individual batteries in a pack, and protect each battery from overdischarge and overcharge. In addition, this system can accurately measure battery impedence to detect bad batteries. The following measurements can be performed on batteries of any chemistry:
The Acquired data is used to calculate the following:
The lab is also equipped with four temperature control chambers. Two of these chambers are large refrigerators which can accomodate larger-sized batteries, such as those from an electric car. Our medium-sized unit can accomodate one battery and provides a wide temperature range of -75 to 175 centigrade. The smallest unit accomodates small batteries such as D-cells and provides precision temperature control using solid-state Peltier effect thermoelectric heater/cooler circuits.