PHEV mod under way, Bristol, UK.

Darn! You'll have a full charge before me now. I won't be back to my Prius before tomorrow some time.

Have fun.

Dave M.

 

did a partial first charge today!
only its freezing outside so the ICE want to kick in all the timedamm ICE


tomorrow i will try a full charger
i also did a upper full grill block today and going to see if i can do a full tomorrow
temp are not helping when working outside:smow:


he nikki already a bit better?

 

Just a brief update. I haven't seen a report from you yet, but...

I did a partial charge on Monday and pulled the plug on the charger, since I needed to run an errand. I quit, as the car started and pushed the voltage up. I'd had the car on so I could monitor the voltage, current and temperature using CAN-View. I couldn't drive very far without the engine starting, but in 13 miles I averaged 126 mpg (according to CAN-View). After I got back, I started to charge again, but it shut down within a few hours, with only about 232 V indicated. I let it sit overnight, and in the morning had a bunch of warning lights (even through the car did start). CAN-View indicated the battery temperature was 139F. The external batteries didn't get above 89F (according to and indoor/outdoor thermometer I was using.) The temperature seemed to stay at 139F for over an hour, but then started to drop. When it got down to 109 F I reset the DTCs and all errors went away. No problems on the internal battery since then. So, I don't know if there was a clitch in the temperature reading or something else. The internal resistance of the combination of parallel packs was still around 0.11 ohm, so the internal battery wasn't actually destroyed. Although, it may have been weakened. I won't know that until I test the OEM battery pack independently of the other packs.

I did disconnect the external packs, and the internal resistance of the OEM battery was 0.25 ohms, which has been normal for it.

I'm out of the country on a vacation (holiday for Europeans I guess) for a week. I'm not going to do anymore testing, until I get back and can have an external set of measurements of current, voltage and temperature when I do the charging.

Dave M.

 

HI

what was your outside temp?
you charged the pack and then went for a drive!
and after that charged the pack again
i think it got hot because you did not gave it any time to settle down.

outside here is freezing the pack never reached 8celsius.
i did a full charge
also did a cell voltage measurement unloaded and loaded.

nikki did you already connect the bms+?

 

I have been monitoring the temperature on the external packs, and they haven't been getting as warm as the internal packs. The only cooling is convective, but there is plenty of air space below them (the spare tire well has no tire in it). By touch the external packs in the a.m. when the interior pack read hot were cool. I'm still not sure the internal pack was at 139F when the sensor read that, which is why I want to attach a temperature sensor to the internal pack that I can read with the car off, while the charging is being done. I find it hard to believe the 139F for at least an hour (and at least 6 hours after completion of the charge with battery voltage of 232-233 V) wouldn't have completely destroyed the pack. Its internal impedance still only reads 0.25 ohms, which for this pack has been normal.

The car appears to be operating normally with the other packs disconnected. However, there hasn't been extensive operation or testing. That will start sometime after Dec. 6th.

Dave M.

 

what was your outside temp?

 

When I've turned the car on for CAN-View readings near the end of the charge, the current (total not just through the internal pack) was about 0.6 A, and temperatures less than 100F. When returning from the 13 mile trip, CAN-View indicated the temp. less than 95F, and the external packs even less. I might mention that when the temperature was indicated to be 139F, the case on the pack was warm but not hot to the touch. I don't know the temperature difference between case and battery, but the case couldn't have been much more than 100F, or I would have felt discomfort in touching it.

I'll be interested in what you do to get CAN-View readings with the car off.

In accessory mode even, the readings aren't necessarily correct.

Dave M.

 

hi nikki

yes shame the thing with your car
its not going good... but lets hope for better time's

i am building a small 2 piece PCD with 1 relay on that will shutoff the charger when one of the packs gets to hot
now i have 2 temp sensors because i only have the OEM pack and 1 addpack.
the total cost for this in parts is about 40 euros or something like 50 dollars

i am connecting the wire's at the moment and its more that i have this finisched before the summer gets here.

i can tell you one thing
there is no use of just 1 addpack to the oem pack with these low temparatures
the current draw is limited to protect the packs and so the ice will run anyway.

2 addpacks is minimum for a BMS+ situation or 1 if you life in a warm climat

 

funny

when i got the zivan i expected it to be bigger haha

do i see 3 hybird interfaces boxen?

 

ok finally!!

wow 3 weeks .... ai ai

 

Very cool! Can't wait to see it up and running. I'm sure you are already aware, but just make sure when trimming the cases down you don't compromise the parts that keep the battery modules in compression. Without that pressure, the modules will expand and pop like pop-corn during charging as internal pressure rises.

 

miscrms

the 2 plates holding the battery's and used for the compression are connect with 4 (2 on top and 2 bottom ) steel pipe's

the battery's are only connected to the base plate to hold them down

you can cutt that compleet case away and still have the pressure hold.