Sony Prototype - BAX-4141

[islandroots]

Is anyone familiar with the battery module? I'm looking for ideas on how to re-use. 64 cells 8s 8P configuration. The total pack voltage currently at 20v and each green cell is 2.5v.

 

[GXMnow]

By the numbers, it looks like they are 2.7 amp hour LiFePo4 cells. 8S makes a good 24 volt pack. I would get a new 8S LiFe BMS board. Without the documents, it is very unlikely you can make the original BMS function again. With any luck, maybe you can find all the cell leads on the connectors. If not, you can easily connect to the buss bars. The main + and - bars are soldered to the PC board. The connector with the yellow wires looks like the intermediate cell connections.

Just over 560 watt hour is not huge. The 8P is still just 21.6 or so amp hours total. What did you want to us it for? Use 2 of them as saddle bags wired in series for a long range 48 volt E-Bike?

 

[islandroots]

Thanks for the information. I'll order a few 8S BMS boards for testing. What amperage should I look for?

 

[GXMnow]

I can't see a label on te cells in your pictures. Without a full model number, we don't know the ratings for the cell discharge current. Many LiFePo4 cells can put out some serious current, but other will over heat. Since we have no idea, I would not go more than 2C or about 40 amps for the pack as is. If it runs dead cold, maybe you can push it a bit more. Maybe do some testing before you spend money. If you can take it further apart and find a label on the cells, maybe we can find more data. I did a few searches on Sony LiFePo4 cells, and did not find any that looked right.