Battery Module - Production Testing

Module Details

25P 2S modules (7.4V nominal, 8.4V max, 5V fully discharged)
25 * 3.45Ah = 86.25Ah per module
29 modules to test in total, 18 will be used in the car

Test Requirements

• Discharge modules at 100A continuous (for 1 full capacity cycle)

• Charge at 20A or more (datasheet says 1.5-3.5A/cell)

• Roughly 900W power dissipation during discharge

• Measure the following parameters

  • Capacity of the module

  • Voltage of each series group of cells (2)

  • 4 thermistor in each module

  • Internal Resistance (DC), AC would be nice Single Cell Testing - Data Processing Guide Individual Cell Testing Evaluation

    • Code for single cells is already built

Test Equipment

Keysight N7909A x2?
Keysight N7000 series power supply - model TBD
Data Acquisition Unit (DAQ970A with a plug-in module, model DAQ970A)

Outputs

1. Number for cell capacity

2. Number for DC and AC internal resistance

3. Log of temperature and voltage over the entire discharge

   1. This will give us a Differential Voltage / Incremental Capacity curve which can be used to estimate a lot of parameters.