22.2v 75ah 1.66kWh 6s Robot Modules - Unbalanced

These modules in particular are a little unbalanced. Most of these packs just have 1 cell that is a different voltage than the rest. This could have been caused by a faulty balancer or 1 cell was not the same voltage when the module was built. We recommend taking the time to charge each cell up to 4.2v to top balance. Good chance it will cycle just fine after that.

These modules are super unique and come with an aluminum enclosure. They were used for warehouse pallet moving robots. Since these are relatively new technology these were only used for a year or two at most. The robots these power have 2 of these modules and one of the modules would be unbalanced either from a faulty balancer or a mismatched cell and the other would be balanced. These are the modules with the unbalanced cell so we are selling these for much less. Excellent value here for someone that wants to top balance the packs or salvage the cells.

They are built like tanks and can push up to 200 amps. Nice copper busbars and a fuse as well. There are 6 3.7v 75ah Kokam cells in series. You can open them up and get easy access to the balance lead wires so you can wire up your BMS. The BMS on here is made to communicate to another system so you will have to add your own BMS.

This module fully charged is 25.2v (4.2v per cell). Fully discharged is 16.2v (2.7v per cell). There is a 200a fuse. If you remove the old circuit boards you will have space for your BMS.

There are some nuts and bolts around the edges that you can take off. After you remove the nuts and bolts the enclosure will open. Lay the module down on the connector side. The back of the enclosure is flat and that is the side you want to pry open. The cells are taped to the enclosure but if you pry open with steady pressure they will eventually release as you can see in the 2nd photo. Pry open from the side where the connector is first then keep pulling up, you will have some leverage then because there is no tape where the circuits are, only tape on the cells. It is not hard to open if you use this method, we were able to get it down to just 1 or 2 minutes. The tape does not stick to aluminum that well so it will come off with some patience and some leverage. You can also use a little scraper tool and keep pressure towards the aluminum to sort of scrape away as you pull up. The tape sucks but it is necessary for the stability since they were in robots.

Module weight is 33 lbs.

Dimensions are 24" x 19" x 2"

If you just want the cells there is good value between the thick copper busbars and the aluminum housing that you can scrap.