Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - new IMA battery, recognized by car, but not charging?

S Keith · 12-03-2015, 05:48 PM

I'll put that in the "passes a torture test column."

It's a very good sign. Double-plus-good if you noticed long periods of assist and regen when appropriate.

Given the uncertain history of your "new" pack, I would put a priority on getting a grid charger on it for 24 hours, particularly given the torturous driving conditions. Ensuring the pack is top-balanced will extend its life. You can get the parts in 10 days and assemble it in an hour plus the time needed to remove and install pack. Simply charge it for 24 hours, put it back in and let it rest for 30 minutes before driving.

You're very welcome. It's my pleasure. I'm only sorry I didn't think of it before. I'm aware of the circuit issue, I've posted on it multiple times, but I just didn't connect the dots. I'll put that on my "always check" list.

Not sure of any ranking, buy many are more helpful in many areas than me. Any post you feel was particularly helpful, you can just hit the "Thanks" button at the bottom right.

To your last question, the 12V disconnect resets the BCM, and it loses it's state of charge information. Upon restart, it reads the tap voltages and initiates a charge to see how the taps respond. It uses an algorithm based on charge current and voltage tap response to decide when the pack is at or above 80% SoC and then terminates the charge and sets the SoC to 80% (full gage).

The lower limit is then established in the future by an algorithm based on discharge current and tap voltage response. For a given current, if a tap voltage drops below a certain threshold, the pack is at or below 20% SoC, and the car terminates discharge. It may initiate a forced regen to bring the pack SoC higher or it may begin background charging at levels that don't show on the gauge.

The recals occur when these tap voltages hit their limits sooner than expected.

The multiple resets just force the car to make these SoC assessments multiple times, and it enables you to get a little more charge in the battery to start at a higher SoC. That's why the final one usually terminates very quickly because the tap voltages max out almost immediately.

12-03-2015, 05:48 PM	#53 (permalink)
S Keith Master EcoModder Join Date: Oct 2014 Location: Phoenix, AZ area Posts: 318 Thanks: 19 Thanked 181 Times in 126 Posts	I'll put that in the "passes a torture test column." It's a very good sign. Double-plus-good if you noticed long periods of assist and regen when appropriate. Given the uncertain history of your "new" pack, I would put a priority on getting a grid charger on it for 24 hours, particularly given the torturous driving conditions. Ensuring the pack is top-balanced will extend its life. You can get the parts in 10 days and assemble it in an hour plus the time needed to remove and install pack. Simply charge it for 24 hours, put it back in and let it rest for 30 minutes before driving. You're very welcome. It's my pleasure. I'm only sorry I didn't think of it before. I'm aware of the circuit issue, I've posted on it multiple times, but I just didn't connect the dots. I'll put that on my "always check" list. Not sure of any ranking, buy many are more helpful in many areas than me. Any post you feel was particularly helpful, you can just hit the "Thanks" button at the bottom right. To your last question, the 12V disconnect resets the BCM, and it loses it's state of charge information. Upon restart, it reads the tap voltages and initiates a charge to see how the taps respond. It uses an algorithm based on charge current and voltage tap response to decide when the pack is at or above 80% SoC and then terminates the charge and sets the SoC to 80% (full gage). The lower limit is then established in the future by an algorithm based on discharge current and tap voltage response. For a given current, if a tap voltage drops below a certain threshold, the pack is at or below 20% SoC, and the car terminates discharge. It may initiate a forced regen to bring the pack SoC higher or it may begin background charging at levels that don't show on the gauge. The recals occur when these tap voltages hit their limits sooner than expected. The multiple resets just force the car to make these SoC assessments multiple times, and it enables you to get a little more charge in the battery to start at a higher SoC. That's why the final one usually terminates very quickly because the tap voltages max out almost immediately.