Test rig description
The EV battery test rig (Figure 1) mainly consists of a DC electronic load, a DC power supply, a thermal chamber, a lithium-ion battery, and a host computer with battery testing software installed. The DC electronic load (battery test system) and DC power supply manufactured by Chroma are used for discharging and charging, respectively. Table 1 compares their detailed specifications.
The thermal chamber is connected to 12V DC or 240V AC, which can cool down to max 25 °C below ambient temperature or warm up to a max of 65 °C. EBC-A20 is a battery tester with charge and discharge functions, applicable to test the capacity of lithium and lead-acid (charging 5A, discharge 20A, maximum power 85W), which supports separate charge and discharge and charge-discharge-charge test. Figure 2 shows a lithium-ion battery system with nominal voltage 204.8V.
| Equipment | Manufacturer/ Model | Voltage (V) | Current (A) | Power (kW) |
| DC electronic load | Chroma/ 63206E-600-420 | 0 – 600 | 0 – 420 | 6 |
| DC power supply | Chroma/ 62100H-600S | 0 – 600 | 0 – 17 | 10 |
Instrumentation
In the process of discharging, the current, voltage, and capacity can be acquired with the software at a max sampling frequency of 2 Hz.
Operating Modes
The DC electronic load includes five different working modes, such as constant current (CC), constant resistance (CR), constant voltage (CV), constant power (CP), and dynamic current change (CCD) modes. And DC power supply also provides a series of charging modes such as CV/CC mode, table mode, and other modes for simulating solar cell curves.
