The Swedish National Development Co (SU) has specialized for many years in developing and evaluating electrochemical cells and power sources for different purposes. These efforts have so far resulted in several generations of iron-air batteries, high energy density nickel-iron batteries and a multi-purpose filter press cell for electrochemical synthesis. In a metal-air battery it is necessary to have a uniform distribution of air over the air electrodes and a good circulation of electrolyte through the system. These two requirements together with a need for low volume can be met by a filter press stack design where the electrodes are welded to polymer frames which form a stable and compact pile. Prototype batteries with capacities up to 30 kWh have been tested in vehicles and the cell design has proved to fulfil the requirements. With the objectives to develop a modular cell that can be used in laboratory and pilot evaluations, as well as in commercial manufacture of chemicals, a new monopolar membrane cell system has been designed in accordance with the filter press principle. The electrodes attached to injection moulded frames are made of polymer material, and stacked with membranes (if needed) in between to form modules of desired size. The projected electrode area of such a module can be in the range 0.08 to 1.04 m 2. By electrically connecting several modules in series, cell systems of different sizes can be obtained. This system has been evaluated in well known reactions and shown a markedly improved current yield and selectivity when compared to results obtained from other cell designs. In both these cases the technique of injection moulding the frames was chosen in order to obtain an economical production. Many of the most critical tasks for the frames such as uniform flow distribution, electrode fixing, turbulent promotors etc., can be obtained through this technique. Furthermore, exclusive polymer materials resistant to most chemicals and heat can be used. In this paper, the design principles of different electrochemical cells are presented together with the two systems developed by SU.