MG EVs special podcast: All your MZ ZS EV BMS Bug Frequently Asked Questions ANSWERED

Stuart Wright

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In the latter part of 2020, some MG ZS EVs had a software version installed which contained a bug which caused the batteries to become imbalanced. In this interview, Miles Roberts will answer the questions that the MG EVs community have about this software update.


00:00:00 - Introduction
00:04:08 - How is the software in EVs different to the software in ICE cars?
00:07:06 - Do EVs have more frequent software updates than ICE cars?
00:12:00 - How are software updates to MG electric cars installed?
00:12:37 - What changes to the ZS EV have been made with the updates?
00:18:08 - How to identify what version of the software is installed?
00:19:02 - What is the BMS and what does it do?
00:19:40 - Is the BMS separate to the other software in the car?
00:22:09 - Can MG ZS EV owners see the battery health?
00:22:55 - What should the voltage display read for the ZS EV?
00:25:20 - What if the voltage display reads something else?
00:27:29 - What is balancing the battery and what causes an imbalanced battery?
00:29:44 - How long does battery balancing normally take?
00:30:50 - Does rapid charging create more of an imbalance?
00:31:12 - How do I ensure my battery is balanced?
00:31:33 - Does cell voltage balancing happen on all EVs?
00:32:13 - Is battery balancing an automatic process?
00:33:10 - Which particular ZS EV software update caused imbalanced batteries?
00:34:43 - How many cars were affected by the bad BMS software?
00:35:00 - What was the actual problem with the late 2020 BMS software?
00:35:31 - Does this software update affect other MG models?
00:36:06 - What impact will an imbalanced battery have on the car?
00:38:27 - Will having an imbalanced battery damage the battery or car?
00:39:05 - What should an owner who believes they have the bad BMS do?
00:40:50 - Have ZS EV owners with the particular software version been contacted to update it?
00:42:44 - What is the procedure for re-balancing and how long does it take?
00:47:48 - Should people re-balance while they have the bad BMS?
00:48:48 - What is the latest version of the ZS EV software and when was it released?

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Cocijo

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Excellent - thanks. Quick question for Miles.
can I get one of the illuminated MG logo signs that’s behind him on the podcast?
🙂
 

Lovemyev

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Excellent podcast.

Further question - will unaffected cars i.e. those balancing to 455 volts, get the new BMS software at the next service?
I did suggest the very same question ready for the Pod Cast, but it was not discussed.
 

Dave53

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In the latter part of 2020, some MG ZS EVs had a software version installed which contained a bug which caused the batteries to become imbalanced. In this interview, Miles Roberts will answer the questions that the MG EVs community have about this software update.


00:00:00 - Introduction
00:04:08 - How is the software in EVs different to the software in ICE cars?
00:07:06 - Do EVs have more frequent software updates than ICE cars?
00:12:00 - How are software updates to MG electric cars installed?
00:12:37 - What changes to the ZS EV have been made with the updates?
00:18:08 - How to identify what version of the software is installed?
00:19:02 - What is the BMS and what does it do?
00:19:40 - Is the BMS separate to the other software in the car?
00:22:09 - Can MG ZS EV owners see the battery health?
00:22:55 - What should the voltage display read for the ZS EV?
00:25:20 - What if the voltage display reads something else?
00:27:29 - What is balancing the battery and what causes an imbalanced battery?
00:29:44 - How long does battery balancing normally take?
00:30:50 - Does rapid charging create more of an imbalance?
00:31:12 - How do I ensure my battery is balanced?
00:31:33 - Does cell voltage balancing happen on all EVs?
00:32:13 - Is battery balancing an automatic process?
00:33:10 - Which particular ZS EV software update caused imbalanced batteries?
00:34:43 - How many cars were affected by the bad BMS software?
00:35:00 - What was the actual problem with the late 2020 BMS software?
00:35:31 - Does this software update affect other MG models?
00:36:06 - What impact will an imbalanced battery have on the car?
00:38:27 - Will having an imbalanced battery damage the battery or car?
00:39:05 - What should an owner who believes they have the bad BMS do?
00:40:50 - Have ZS EV owners with the particular software version been contacted to update it?
00:42:44 - What is the procedure for re-balancing and how long does it take?
00:47:48 - Should people re-balance while they have the bad BMS?
00:48:48 - What is the latest version of the ZS EV software and when was it released?

If you find the MG EVs forum and this podcast useful, then please consider becoming a Premium Member for just £3+VAT per month. Details at https://www.mgevs.com/account/upgrades
Very informative podcast, I did notice Miles being diplomatic calling the BMS Battery Monitoring System.
 
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