Step 1 - Module Wiring Verification

Owned by Micah Black
Last updated: Aug 25, 2021
2 min read

As a first step to the production testing, we tested the wiring inside all of the module to ensure that everything was connected properly.

I created a board to do all the measurements for the cell voltages and thermistors, as well as a script to automate the testing. With this, it was as simple as plugging the module in, pressing a button, and reading the results.

 

Here is the script: https://github.com/mbA2D/Test_Equipment_Control/blob/master/MSXIV_Battery_Module_Wiring_Test.py

I used my 64 channel DAQ unit to measure the 9 analog signals. The voltage taps have resistor dividers added inline in the wiring to keep the total voltage under 3.3V for the DAQ.

 

Results:

Here are the results of the module wiring test. This test identified an incorrect voltage measurement on Module 13.

The module was inspected. Measuring with a multimeter, all the connections on the 14-pin connector coming from the module were correct, so the Battery Module Connector Board was replaced, and the test was re-run, now giving the correct value for the voltage measurement on Module 13. After more careful inspection, a bad solder joint on F6 of the BMC was identified and fixed. This BMC is now good to use as a spare.