The utility model relates to a secondary cell field provides a cell and electrode subassembly and mass flow body thereof, the mass flow body includes along the base plate of horizontal direction extension and moves towards respectively along vertical direction the first connecting plate and the second connecting plate of the both sides extension of base plate, wherein, first connecting plate and/or second connecting plate extend in vertical face. According to the technical scheme of this application, because the extending in vertical face of the collection first connecting plate of fluidic and/or second connecting plate, therefore can be adapted to extremely the ear with a plurality of utmost point ears relatively portably and have different designs when being connected. Simultaneously, because the connecting plate extends in vertical face, consequently connect with (Face to face) the laminating that is in the vertical face of being connected of utmost point ear and/or electrode utmost point post to better bonding strength can have.