HV Battery Pre-Heat... Anybody tried it?

[orange4boy]

In my case I'm just busy with other projects. Too many pots on the stove.

I'm determined to do it though.

My current idea is to plot the regen amps, SOC, L/100 from the Graham scanner on one particular hill in my area.

There may be too much noise and variation to make a good comparison. One thing I'll have to contend with is that the battery "stores mpg" If you don't end up with the same SOC at the end your trip, the numbers will be difficult to digest. I will have to start lerning how to even out the SOC.

An A-B-A test would be impossible, really.

Ideas are welcome.

[PaulHS]

Originally Posted by orange4boy

I'm determined to do it though.

My current idea is to plot the regen amps, SOC, L/100 from the Graham scanner on one particular hill in my area.

Thanks for responding. And I appreciate your determination.

A few questions.

1. I'm not familiar with a Graham scanner. I presume it has recording capability?
2. You are plotting your parameters to develop a baseline?
3. What is the significance of the hill in your experiment?
4. How will you correlate these parameters with HV battery temperature?
5. Is there a reason for not including initial ambient temperatures?
6. Wouldn't direct temp measurements of the HV battery accomplish your goal?
7. Evidence indicates that raising the battery temp from "sub-optimal to optimal" may require from one to three hours, depending on initial ambient temps, on an unmodified car. How will you deal with that?
8. What method are you currently considering for pre-heating?

Sorry if it seems I am bombarding you with questions but I don't quite understand how you plan to proceed.

[orange4boy]

I have already started to gather my baseline mpg data. ambient air, road condition, battery temps, SOC, MPG. (wind is usually not significant because of forest lined roads)

The Graham scanner is a gen 1 data display/logger which gathers data from 50 sensors and displays 4 outputs at a time.

Connects to Vehicle using Existing OBD-II Data Link Connector 3 (DLC3)
Communicates with Vehicle ECUs using ISO9141-2 and ISO14230 (KWP) Protocols
Retrieves and Displays Data on Operation of Hybrid System, Engine, Battery, etc.
More than 50 Data Items available from Engine, Battery and Hybrid Vehicle ECUs
Logs Data via a Serial Port to a computer or PDA for Spreadsheet Graphing
Retrieves and Optionally Clears Diagnostic Trouble Codes

Generously lent from Bob Wilson's "Tool library"

I was thinking of using the hill to log regen amps and SOC. I know the computer allows the battery to take more amps when it's warm so I want to see if warming makes a difference in SOC.

I have a battery warmer wrap intended for lead acid which I hope to install between the battery housing and the body. I still have to do more exploration on that though.

Currently placing the blanket on top does heat the inside of the compartment and the top of the battery as shown by the scanner but it can't possibly do a good job of even heating in that position.

I may start a new thread to document it. May be a couple of weeks before I can get to it though.

[PaulHS]

Originally Posted by orange4boy

I have already started to gather my baseline mpg data. ambient air, road condition, battery temps, SOC, MPG. (wind is usually not significant because of forest lined roads)

I may start a new thread to document it. May be a couple of weeks before I can get to it though.

I'll be watching for your results. Thanks!