NOVELTY - The cell has a composite solid electrolyte membrane (3) positioned between a positive electrode plate (1) and a negative electrode plate (2). The membrane comprises inorganic solid electrolyte layers (31) and structure supporting layers (32) which are alternately laminated along a laminating direction (D), and have abutted surfaces (S1) respectively abutting against the electrode plates. The angle (alpha) between the laminating direction and abutted surface is more than or equal to 0 degrees but less than 90 degrees.    USE - Cell for electrical storage device e.g. lithium ion battery or capacitor, or sodium ion battery or capacitor.    ADVANTAGE - The inorganic solid electrolyte particles in the inorganic solid electrolyte layer keep a well contact with each other, thus well ensuring the structural integrity of the transmission channel of the lithium ions, such that the composite solid electrolyte membrane can take advantage of the high lithium ionic conductivity of the inorganic solid electrolyte. Due to the existence of the structure supporting layer, the composite solid electrolyte membrane has an excellent mechanical processing property, thus significantly improving the electro-chemical performance and the safety performance of the cell. A very thin and excellent composite solid electrolyte membrane can be obtained from the preparation method of the cell. The fragility of the inorganic solid electrolyte layer can be overcome in the assembling process and the using process of the cell, so that the composite solid electrolyte membrane can be well applied in the cell. The laminated structure of the inorganic solid electrolyte layer and the structure supporting layer of the composite solid electrolyte membrane is simple, such that the cutting operation is easy, thus the mass production can be easily performed, and a full-solid-state cell with high performance can be realized.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of a cell.    DESCRIPTION OF DRAWING(S) - The drawing shows the exploded view of a cell.    Positive electrode plate (1)    Negative electrode plate (2)    Composite solid electrolyte membrane (3)    Inorganic solid electrolyte layers (31)    Structure supporting layers (32)    Laminating direction (D)    Abutted surfaces (S1)    Angle (alpha)