An assembly, comprising: a plurality of housings stacked on top of each other, each housing comprising a plurality of cavities; each cavity comprising a stack of electrochemical storage cells in the housings, each electrochemical storage cell comprising: an anode electrode; a cathode electrode; and a separator located between the anode electrode and the cathode electrode; and wherein the assembly further comprises a binding member and at least one pressure plate, wherein the binding member and the pressure plate are configured such that tension in the binding member is transferred to the assembly via the at least one pressure plate to apply pressure to the assembly; and wherein the assembly is characterised in that: the plurality of housings nest into each other; the anode electrode, the cathode electrode and the separator comprised in each electrochemical cell are not laminated to each other and no adhesives or binders are located between them; each housing comprises a lid and each housing and each lid comprises a flexible material that bends under pressure applied by the binding member and the at least one pressure plate and the weight of the electrochemical storage cells stacked one above another, and in that the housings are configured to interlock and align with the at least one pressure plate such that the pressure applied to the assembly by the binding member and the at least one pressure plate is transferred to the anode and cathode electrodes of the freely stacked electrochemical storage cells such that the anode and cathode electrodes of the stacks of electrochemical cells bear at least 90 percent of the loads applied to the assembly. a plurality of housings stacked on top of each other, each housing comprising a plurality of cavities; each cavity comprising a stack of electrochemical storage cells in the housings, each electrochemical storage cell comprising: an anode electrode; a cathode electrode; and a separator located between the anode electrode and the cathode electrode; and wherein the assembly further comprises a binding member and at least one pressure plate, wherein the binding member and the pressure plate are configured such that tension in the binding member is transferred to the assembly via the at least one pressure plate to apply pressure to the assembly; an anode electrode; a cathode electrode; and a separator located between the anode electrode and the cathode electrode; and wherein the assembly further comprises a binding member and at least one pressure plate, wherein the binding member and the pressure plate are configured such that tension in the binding member is transferred to the assembly via the at least one pressure plate to apply pressure to the assembly; and wherein the assembly is characterised in that: the plurality of housings nest into each other; the anode electrode, the cathode electrode and the separator comprised in each electrochemical cell are not laminated to each other and no adhesives or binders are located between them; each housing comprises a lid and each housing and each lid comprises a flexible material that bends under pressure applied by the binding member and the at least one pressure plate and the weight of the electrochemical storage cells stacked one above another, and in that the housings are configured to interlock and align with the at least one pressure plate such that the pressure applied to the assembly by the binding member and the at least one pressure plate is transferred to the anode and cathode electrodes of the freely stacked electrochemical storage cells such that the anode and cathode electrodes of the stacks of electrochemical cells bear at least 90 percent of the loads applied to the assembly.