Add HPPC Testing Profile

[jsimonclark]

Implement a control algorithm for the Hybrid Pulse Power Characterization (HPPC) testing procedure.

"For the HPPC test, 10% SOC steps are used based on the battery capacity determined from the static capacity test above. The steps are made from 100% to 0% SOC, and can continue back to 100% SOC for the second half of the test profile.

Each step consists of:

• Rest for 60 minutes.
• Pulse, discharge: 1C for 10 seconds
• Rest for 10 minutes (relaxation period)
• Pulse, regeneration: 1C or 0.75C for 10 seconds
• Rest for 10 minutes (relaxation period)
• Discharge/charge to next step at prescribed discharge/charge C-rate (per manufacturer’s data sheet)

Each cell type can be tested at each SOC, including across various temperatures and various C-rates for the pulses (discharge and charge)."

https://www.ansys.com/blog/building-better-batteries