battery management system

A battery management system (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack), such as by protecting the battery from operating outside its safe operating area, monitoring its state, calculating secondary data, reporting that data, controlling its environment, authenticating it and / or balancing it.A battery pack built together with a battery management system with an external communication data bus is a smart battery pack. A smart battery pack must be charged by a smart battery charger.

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  1. Delboy102000

    Vin Numbers for Faulty BMS update identification

    Does anyone know where to access the vin number range of ZS Ev cars suspected of having the faulty patch installed. My full charge voltage on a 2021 car is 455 volts and the range seems to drop of fast even when driven at a steady 65 mile per hour. The other day I started a journey with a...
  2. Aussi55

    BMS Version is there a better one available

    Hi, Having had the chance to do my first full charge and equilisation I was wondering if there is a better version available. The HV voltage is 449v with the GOM range showing 148 miles in normal mode regen 3, heating switched off. Car is August 2020 and has had one service. I don't get...
  3. Headgas1

    BMS update ?

    I read several threads on here talking about the cars software/ bms updates Comfort 2 etc…. How can you tell what version the car is running on and do they update the car when you service it or do you have to pay separately or is it better to just be blissfully unaware ??
  4. T

    March 2021 registered ZS EV but old BMS?

    This one is a bit odd. When buying a March 2021- registered ZS EV very recently from a non-MG dealer I saw that the temperature was showing in the infotainment screen and the remaining miles in the dash and without checking further thought it must have the latest BMS update. However after my...
  5. johanhoeke

    any OVMS news to share? also, BMS 092660R12 supported?

    greetings from the Netherlands, Considering getting OVMS. I've just watched the march 29th podcast about OVMS for the ZS EV where there was a mention of new features on the verge of being released and was wondering if there's been progress made? I've checked MG EV — Open Vehicles documentation...
  6. S

    New software (BMS?) on 4th September

    Took the car in for first service on Saturday at Panda MG in Swansea. The bloke did all the checks and said there's a new software coming out on 4th September and I am welcome to book the car in after that to do the update. As far I can tell, no updates was made so the car is in the same state...
  7. R

    MG / dealer not recognising BMS update as required

    We have an early BMS version (1125600R15) which has caused our car to fail to start after charging. It's been to the original dealer for an update but they did not update the BMS and instead updated the infotainment system. We've not been able to get a reason for this from the original dealer...
  8. D

    BMS updates again

    Just had my BMS updated. It was 1125600R15 The BMS version is now 0210622EU1 I have read that the BMS version should be 1230621A01 (the January update) I have also read that the updates are in the following order - 1125600R15, 016600R17, 0603610R28, 1016620R40 (supposedly the bad BMS)...
  9. J

    Sorry BMS again!

    I cannot get my head around what version my pre reg Feb 2021 Zs EV should have? I was assured by the dealer that it had the latest software update when bought it in early June 2021. I have just discovered that my battery when fully charged at home has a voltage of 456v is this the version I...
  10. B

    Range issues - Filing a "Warranty Claim" on our Battery or "Rejecting" the purchase

    Hi everyone - I'm keen to hear if anyone has had a similar experience with their range cars, or if we are expecting too much from it. In essence - we don't feel the car's range is as advertised, and are therefore beginning the process of rejecting the purchase (but first attempting to file a...
  11. P

    Long term effects of bad BMS?

    Is there any info known about the potential long term impacts of having the bad BMS software? I.e. after fully balancing and recovering to 449v, does the battery still hold 42.5kwh or has the BMS caused any long term deterioration? I don't have the equipment to take any exact readings but...
  12. S

    BMS

    Is there a way of finding out through settings what BMS update you have?
  13. D

    Do I have the comfort 2 update and correct BMS software ???

    Hi again EVers - My media/nav shows outside temperature. My drivers dash screen shows remaining range. However, my car does not charge from my 7kW charger without the doors being locked. when I plug in teh charger it just says connected but not charging until I lock the doors. Also, When I got...
  14. Pattolad

    Has anyone rejected a car due to bms fiasco

    Hi, Bought my car 2 weeks ago ex demo 3200 miles and after its second fast charge its lost range dramatically 2 miles is taking 25 of the range.Spoke to my dealer today and they cant fit me in till the 29th to investigate. Really considering just giving them the car back and walking away...
  15. G

    BMS Update?

    Is it necessary to get the January BMS Update if my car did not get the bad one last year? My dealer Eric Stead said that it was only needed if the car had the bad one to put it right and that MG would tell them what updates the car was in need of. The car in question is a ZS EV and was bought...
  16. slarod

    MG ZS EV, "GOM", summer of 2021, not 1969, range 353km, 362km and 370km in 3 days, 5 months since new BMS

    Hmmm, so what did go wrong after all, since the update this year in january, trusted granny charging, not much other going on, now in "Norwegian" summer, or is it ?, the range is back, or what ? Separate trips with re-charge @home with this on the "GOM" after 5 months, who can beat that, just...
  17. Orcadian

    BMS Update

    There has been a lot of talk about the "Bad BMS" update. I picked my ZS EV up in October 2020. Everything seems to be OK> I think it was programmed before the bad BMS. What is the advantage of the new BMS? Bearing in mind it will be quite costly to take the car to an MG Dealer (Ferry costs etc.)
  18. G

    First Service BMS upgrade anxiety

    It’s real guys!!! Sitting here at the dealership waiting for my ZS EV to have its first service and software upgrade l can’t believe how nervous l have become. When the technician said, “it’s ok sir, we’ll take good care of her” and walked off, it felt like she (ZSEV) was going into surgery ? l...
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  20. E

    BMS update???

    My zs ev is just 2 weeks old, I gave it a full charge until the MG light went out. As in the photo it only went to 455v, I would have thought being new it would have had the update taking it to 449v, or does it take a while to adjust? also it only gives me a distance to go of 138 miles, not what...
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