V Model:
Requirement:
What it has to be able to do
System Analysis:
How the car is being powered
Li-Cells
Requirements and Architecture:
Motors for 130V pack
Amount of cell in series and parallel
Implementation:
Designing
Refer to Architecture Slides: https://docs.google.com/presentation/d/1tJLbY4yqJ0mqhb_SOfv2kcusudV-PL_oYYs4-G2rfNo/edit#slide=id.g9977bbed39_0_0
do NOT use pouch cells - harder to use
Refer to Sizing a Pack Slides: https://docs.google.com/presentation/d/1JVukXhlPpmShwNgenWhxXkW0ItXEAZJyxY8FID5q1MY/edit#slide=id.g9977bbed39_0_0
How to Size a Pack:
Divide by the minimum voltage of the cells
Always want the motor voltage rating to be above the rated voltage
Do not take into-consideration cycle life for battery pack - low-usage, has no significant impact
General Terminology:
Current Collectors - go on-top of the cells
Busbars - connect modules together
Suggestion: Assigning someone to High Voltage Distribution who deals with:
Contacts
Fuses
Pyros - activates via an external-signal, can be used to disconnect a busbar
Thermal Study-State:
Determine the amount of power that is lost through heat-generation
cell & busbars are main-components
make a model and determine the thermal-study state
determine when the power (Q-into system) is equal to the Q-out of the system, then there will be no increase in temperature
module/coupon level
determine the rise of temperature over the change of time - rise in-temperature changes over-time
Can get away with no cooling if we can determine that the temperature generated is less
Thermistors - what is the error-rate for the thermistors? (+/-1 degree celcius)