10S5P battery pack with BMS wont charge

ESK8 Electronics
1

Hi everyone. I finally got my Battery pack with BMS finished. The Spagetti cables reads the right voltages from 3.7 and up to 37.

But when i attach the 42V battery charger to the BMS. The light on the battery charger goes from green to red and then turns off then tries the same again. It is clear that the voltage is cut by some sort of protection. Either by the BMS or the power supply. I mostly think its the power supply.

I dont know what can cause this. The cables are correctly installed and voltages read right.

When i installed the BMS i firstly tried to solder the battery negative leads directly to the BMS. It gave a spark and a black mark around the spot. I tried to see for damage or hot components or smell. But nothing i could find was suspicious. So i just assumed it was a connection spark.

Can it maybe have fried the BMS with the spark? Does not seem right but i cant see any other reason why it wont work,

I have had the whole battery connected now and nothing gets hot or smells.

lookinh forward to hearing your advice.

IMG_20171016_192704.jpg3464×4618 1.32 MB
IMG_20171016_192709.jpg3464×4618 1.11 MB

2

How did you wire your battery?

3

5 LG H4 in standard parrelel packs and then with a single positive and negative cable then i connected the BMS leads cable to each of the red positives and connected the packs of 5 to each other, which after i could see a total voltage of 36V

4

That would be 5s10p

5

Show me photos of how you actually wired it

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ddd.jpg2776×844 152 KB

7

You might have attached your balance leads in reverse

8

Looks like 10s5p to me.

@nikoli280 what brand of bms are using? It’s possible you fried it with that spark.

9

Diagram wasn’t uploaded

1 Like
10

This is the BMS

http://www.batterysupports.com/lion-lipo-nbsp-36v-nbsp-10s-c-32_41.html

11

I just think it is wiered that i get a correct voltage reading at the end after BMS, if that could be possible then i dont see that the BMS could be the problem. please correct me if im wrong.

12

Does anyone have a possible solution. This bugs me the hell out.

13

I would check your BMS wiring as willpark said. You may have your balance leads reversed. You can attempt to see if you can manually charge the battery by bypassing the bms as well.

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I have checked the cables and they seem right. starting from right to left i get 3.6V 7.2 and so on up to 36V

15

On the link above it seems to indicate the wiring should be from right to left, unfortunately.

16

Yes sorry i typed wrong. my configuration is from right to left.

17

It seems odd that you would get a spark when connecting the negative battery cable…Did you do that while the balance connector was plugged into the bms?

Can you tell me the voltage at these two wires? Also, in the picture, is that the top or bottom of the connector(when plugged in)? I

edit: looks like the top i just want to make sure

battery.jpg776×916 112 KB

18

I only got the spark when I was trying to solder the negative lead from the battery directly to the BMS. In the instant the soldering iron touched I got a spark.

Then I decided to make small plugs from the BMS and after that I could connect and disconnect the battery negative leads from the battery without spark

19

Is the 2 plugs the end of each side of the Ballance cable? If it is then I get 36V. Which should be fine right

20

I only got the spark when I was trying to solder the negative lead from the battery directly to the BMS. In the instant the soldering iron touched I got a spark.

Was the 11 pin bms connector plugged into the BMS prior to you soldering the negative cable?

Is the 2 plugs the end of each side of the Ballance cable? If it is then I get 36V. Which should be fine right

I need the voltage at the green point, and the voltage at the purple point in the photo I posted