BMS broken, damaged cells, or both?

[Bas]

In this picture, the iron connection part on top is a little loose, when I press it, I can see it touch and untouch. Could that.. Be.. The.. Reason?

EDIT: More pics of other side of the Pack.

 

[Bas]

Hey guys,

The results of me measuring voltage of the battery pack, drop a bomb on further continuety of my scooter project, I am afraid.
It is just 1 more financial setback too many. Because I am kind of noob, I am afraid I made many expensive controllers and wheel engines smoke. That is part of learning, but the last few setbacks involving the battery, made things go crazy fast from bad to worse..

I just measure my 3 months old 1200eur0 Panasonic Pack, see the picture below for the result in Volts.

I am afraid with this values, it can go straight to the kliko. Tomorrow I am going to buy my wife those shoes..

 

[999zip999]

The whole can is neg just the nipple is pos that's why the paper gasket so not to touch neg can. That will short cell.

 

[j bjork]

It would be easier if you mesured one cell group at a time, to get the voltages.
I wonder what have happened where they removed most of the plate and used nickelstrips instead..

In that picture every cell seems to have paper insulators, but on the picture where you point out a bad weld there are no paper insulators. Is that on the other side?

 

[leffex]

In this picture, the iron connection part on top is a little loose, when I press it, I can see it touch and untouch. Could that.. Be.. The.. Reason?

EDIT: More pics of other side of the Pack.

You need to repair it if its broken or it may cause danger in the future if you let it be.

You use alot of protection. You need glasses as the minimum for safety and free space around the battery. If you have metallic tools, try use plastic instead.

Check out how my friend noticed an error on his pack very similar to yours and how he measures each individual cell group in an easy way:
https://www.youtube.com/watch?v=uyJ_bqtjj34

 

[Bas]

Hi Leffex,

With this low voltages of my pack.. Except for the bms, do you think any of the batteries still can be used, or should I consider it as total loss?

Greetings Bas

 

[leffex]

It would be easier if you mesured one cell group at a time, to get the voltages.
...

Hi Leffex,

With this low voltages of my pack.. Except for the bms, do you think any of the batteries still can be used, or should I consider it as total loss?

Greetings Bas

I think you should double check voltages for each cell group. After that you will know more and know what to do. The video I sent you shows you one way of doing it. If you don't know search youtube for how to measure cell voltages.

an example:
The total voltage of a 10s4p pack, that is 10 series, 4 parallel cells in each group for a total of 10 groups. Sometimes one group fail and so will start to impact range of your battery. Normally you get 50km in distance and now only half or less. That is because the BMS is doing its work and shut down when the total voltage gets below its lowest voltage setting. Most BMS are dumb and doesn't protect each individual cell group from going lower and if that is the case and a cell group gets too close to 0 volt it will have a very hard time to get charged up. It may even be so that the BMS have a protection against charging if one cell group has too low of a voltage.

 

[Bas]

Thank you my friend, I am going to watch the video, and afterwards I am going to conquer my fear and measure each indivual cel
First I need to watch the video, after about "4 little bad luck moments" with batteries.
Some good preparation, as in not drinking several pints of larger before doing the soldering, but in reading and trying to understand what I am actually doing,would be in place.

I will post the results!

EDIT: HMM can I still use this? :? :?

 

[fechter]

Thank you my friend, I am going to watch the video, and afterwards I am going to conquer my fear and measure each indivual cel


EDIT: HMM can I still use this? :? :?

You can use a grinder or file and shape the tips back into points. If the material is brass, it might oxidize over time and cause issues.

 

[999zip999]

I use shrink tube so only the very tip of the probe is exposed.