NOVELTY - A flexible photovoltaic element (110b) has at least2 covering layers (101b, 106b), and semi-material having at least2 electrode layers (102b, 105b) and electrolyte carrier layer(s) (104b). The element is composed of laminated and/or extrusion coated assembly of covering layers and semi-material. The covering layers seal the semi-material.    USE - The invention is used as solar cell. It is suitable for light poor environment, such as indoor use or cloudy areas.    ADVANTAGE - The invention provides possibility to produce endless long cells and maintaining functionality of the cells while combining their flexibility with large continuous areas of the cells. There is a simplified production process such as elimination of a separate sealing step. Contacting of the cells in series can be automatically integrated in the process. Non-polluting materials are being used. The flexibility of the cells allows easily foldable, more easily transportable, and more easily storable end-products. There is also a possibility to adjust parameters such as current and voltage in a simple way.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method of producing the flexible photovoltaic element comprising providing the semi-material, providing the at least2 covering layers, and joining the covering layers and the semi-material through extrusion coating(s) and/or lamination operation for composing the element. The covering layers seal the semi-material through the extrusion coating and/or lamination operation; and    (2) a multi-lane assembly line for manufacturing as laminate structure for the element comprising first lane for lower electrode of first cell; second lane for upper and lower electrode of first and second cell, respectively; third lane for upper and lower electrode of second and third cell, respectively; overlapped lanes sealed by lower and upper polymer layers; and cut and heat-sealing device.    DESCRIPTION OF DRAWING(S) - The figure is a schematic cross-sectional view illustrating a part of the inventive photovoltaic element.    Photovoltaic element (100b)    Covering layers (101b, 106b)    Electrode layers (102b, 105b)    Heat-resistant substrate (103b)    Spacer (104b)