Batteriesystem mit Batteriemanagementsystem, Speichersystem zur Speicherung elektrischer Energie mit einem solchen Batteriesystem und Verfahren zur Inbetriebnahme eines solchen Batteriesystems

The invention relates to a battery system comprising secondary cells having the following features: a first battery (1), at least one further battery (2) and a regulation system for regulating the battery system voltage during the charging process, wherein the first battery (1) and each further battery (2) are each connected to a battery voltage regulator unit (4) in the form of a balancer for influencing the charging process, which battery voltage regulator unit measures various parameters, such as temperature of the batteries (1, 2), applied voltage, current flowing, and can pass on these parameters to a central processing station. Provision is made in accordance with the invention for the battery voltage regulator units (4) to be equipped with optocouplers (40) having optotransmitters and optoreceivers, via which data determined can be passed on to other battery voltage regulator units (4). Furthermore, the invention relates to a store system for storing electrical energy with the aid of a battery system according to the invention and to a method for bringing such a battery system into operation.