[boekel]

Well...google does come up with a lot!

just search for:
ripple current lithium ion battery

one of the results:
https://www.sciencedirect.com/science/article/pii/S030626191630808X


apart from the effect on the battery...don't forget EMI / EMC

 

[boekel]

Please don't do this!

Charging should be done with a set voltage corresponding with the target voltage.
The BMS is there to 'pull the plug' when charging / discharging is not according to the set limits. (and to adjust current when temperature is too high / low)

In your scenario, when something doesn't work, you have your batteries exploding...not a pretty sight.

Other thing is to charge well you really need a CC-CV charge, and turn of charging after reaching 100%SOC.