Bosch announced in March that it was exiting the crystalline photovoltaic business but indicated it would keep its thin film division, Solar CISTech.
German newspaper Märkische Allgemeine, however, reported on Monday that Bosch will either sell or close the unit, based in the state of Brandenburg, by the end of 2014.
The divisions 160 employees, backed by IG Metall, are now demanding a new collective agreement.
"We demand a recognition agreement. We expect our management to be willing to negotiate in the upcoming negotiations in June," said Works Council Chairman Bodo Paetzel in a statement released by IG Metall. The works council is also looking to insure the social security of the employees in case Bosch closes Solar CISTech, which is located in the town of Brandenburg an der Havel.
Collective bargaining talks for the Bosch employees in Brandenburg are set to start on June 13.
IG Metalls goal is the recognition of the existing collective agreement for the employees of Bosch Solar Energy in the state of Thuringia, which covers not only wages but also employee classification.