Hands-on hybrid electric vehicle battery course
The 2-day nickel metal hydride (NiMH) hybrid battery course demonstrates split current charge-discharge cycling, internal resistance measurements and hybrid battery balancing. No prior knowledge of hybrid batteries is required. The hands-on experience includes use of the EVc-30 hybrid vehicle battery reconditioning unit. Anyone can learn!
Hybrid battery short course schedules (2018/2019):
|Indiana (35 miles from Chicago)
NuVant Systems Inc.
|January 10-11||January 3-4|
|January 17-18||January 16-17|
|February 7-8||February 4-5|
|February 21-22||February 26-27|
Indiana and Massachusetts course fee:
Limit: 8 attendees per course
Call 219-644-3231 for class registration help.
Day 1: 8:30 AM – 4:30 PM
Day 2: 8:30 AM – 4:30 PM
Course registration includes:
- Course work materials
- Continental breakfast, snacks & coffee breaks. Lunch on your own.
- Use of NuVant EVc units for charge-discharge, internal resistance measurements and complete reconditioning.
Hybrid battery course benefits
- Experienced instructors provide in-depth knowledge on hybrid battery cycling, reconditioning and safety issues.
- Real time demonstration of charge-discharge cycling and battery internal resistance measurements.
- Learn to identify bad modules prior to reconditioning
- Work the database for inventory maintenance and pack assembly.
- The dangers of over-charging and over-discharging.
Click images to enlarge
Hybrid battery packs have 28 to 40 NiMH modules assembled in series. A Prius type prismatic module consists of six individual NiMH cells (1.2 V each) assembled in series. Detailed specifications for these modules are available.
7.2 V hybrid battery prismatic module with individual cell marked 1 – 6
NiMH modules undergo shallow depth-of-discharge (less than 10%) because they are used for power assist, not electric drive. Unused electrode material undergoes structural changes that effectively reduces amp hour (Ah) capacity. This reversible failure mode (“memory effect”) takes modules out-of-balance with neighboring modules, especially those that are near the pack center. Out-of-balance modules can undergo voltage reversal during discharge. Voltage reversal at the anode and cathode permanently damages the module. High-rate charging generates gaseous oxygen at the positive electrode that can pressurize and rupture the module casing. Modules, reconditioned by a series of deep charge-discharge cycles with tapered currents, will recover lost capacity and have an extended lifetime. Overheating of hybrid batteries causes venting of vaporized electrolyte water. This permanent failure mode increases the internal resistance of the module. Such modules substantially increase reconditioning time. Modules suffering from permanent failure modes are identified and removed before full reconditioning.
Part I: Introduction
a) Battery aftermarket and geopolitics
b) How NuVant reconditioning technology differ from others
Part II: Terminology, definitions and usage
a) Coulombs, amps, voltage, amp-hour, watt-hour
b) Cells, modules, packs, cylindrical versus prismatic cells
c) NiMH batteries vs. Li-ion batteries
Part III: Underpinning science behind battery reconditioning
a) Reversible and irreversible capacity losses
b) NiMH memory effect – effect of shallow depth of discharge
c) Use of state-of-health data for module sorting and battery pack assembly
d.) Refurbishing packs vs Reconditioning modules
Part IV: Hands-on experience with the EVc-30 reconditioning tool
a) EVc-30 overview
b) Prius modules, clamping, cooling box and connections to EVC-30
c) EVcharge software: Opening/writing project file, starting/storing project files
d) NuVant reconditioning plans – Prius and Honda modules
e) Before and after reconditioning discharge profiles
f) Dangers of reconditioning – Module swelling, overheating, pack explosions
Part V: Interpreting EVc-30 data output
a) Results –Diagnostic discharge profile, Exporting summary files
b) QR code reader – Tracking inventory
c) Module pairing after reconditioning (Battery pack balancing)
d) Reconditioning data base
Part VI: Conclusions:
a) Business models
b) Electric versus hybrid vehicles
c) Specifications look-up table
d) EVc operation glossary