The service life of batteries in electric vehicles depends, among other things, on ensuring that a constant charge level is guaranteed. Preh control units, BMU (Battery Management Unit) and CSSU (Cell Supervising Sensor Unit), monitoring and controlling each individual battery cell's charge state and temperature. This so-called passive balancing ensures longer battery life.
By means of electronics for the cooling valve's switching processes and control, increased thermal loads are avoided and the battery cells' service life is increased. In addition to passive balancing, Preh also enables the use of active balancing, which can charge or discharge the respective battery cells in a completely identical manner (synchronously). The advantage of active
compared to passive balancing lies in completely using the energy within the battery cells through redistribution, whereas in passive balancing the remaining energy from better battery cells cannot be used during the discharge process.
