+46 70 6381070 +48 12 6586666 06 225 441 58 +43 2236 318131
  • EVtun
  • Common question: Is charging to 100% kill the battery or depletes SOH?
News

Common question: Is charging to 100% kill the battery or depletes SOH?

2019-10-30 10:56
by V-tech Tuning

The main problem of charging over a point, where voltage reaches its maximum value is, that monitoring of voltage is not per cell, but per batch of cells (package). Then - some cells in a serial stack can be overvolted due to their state of health, temperature (this may differ due to geometrical position of the cell in the stack), while another one in the same stack will be undervolted. But for governor (BMS) all looks ok, as serial stack voltage is within the maximum permitted.
Thus - it is not a problem to charge almost full. The problem is to charge with maximum permitted voltage. So it is why charging with DC charger starts to be dangerous at 80% or so, with a home fast charger (6,6 kW/h) at about 95% state of charge, and with slow Level 1 charger - may be at 99%.

Go back