We're considering a project that would involve dealing with thousands of 2S 18650 battery packs, which is not something we've had to deal with as none of our products to date have used rechargeable batteries. Part of this project planning involves figuring out a QA process for these packs we'd be buying in from an outside supplier to ensure they continue to meet requirements over a number of orders, adding up to a few thousand packs per year.
I'm not fully sure what level of testing we'd want to do, but I'm imagining we'd want to put a few samples of each batch through several charge/discharge cycles to verify capacity, and maybe a quick AC-IR test on a larger fraction or even 100% of the incoming packs.
So assuming that test strategy makes sense, which I'll be doing some further reading to verify and I'm open to input on, I'm not sure what equipment we'd need to best accomplish that. I see that Hioki and a couple of others make a few models of benchtop quick test devices which seem reasonable for AC-IR testing (like the BT3561A), but I'm having a surprisingly hard time finding equipment for capacity testing. There are tons of little gadgets designed for individual cells or for RC battery packs of various sizes, and a few more industrial-looking options for testing hundreds of cells at a time or giant EV packs, but I haven't turned up much in between. I know a battery charge/discharge test setup can be put together from standard test equipment, but I'd prefer to find something a little simpler to set up and hopefully easier to maintain and easier to train people who aren't EEs to use.
Are there equipment options out there that I just haven't found? Or am I going to need to just put something together myself? Any other input from anyone who's done this sort of thing before?