Wind turbine blades made of two separate sections, and method of assembly

A wind turbine blade comprising

• at least two wind turbine blade sections which are separated, said separate sections including one or more strengthening structures comprising at least one of an internal beam strengthening structure, an internal strengthening structure at the trailing edge, or an internal strengthening structure of a surface shell structure with a number of substantially oblong carbon fiber strips and strips of one or more further materials,
• wherein said strengthening structures include ends that are connected in a connection joint, said strengthening structures extending along a longitudinal direction of said wind turbine blade sections and defining a transverse cross section oriented transverse to the longitudinal direction,
• wherein said ends are at least partially shaped as dentated ends which include corresponding connection surfaces, one or more relevant dimensions of said surfaces being larger than corresponding dimensions of transverse surfaces of the strengthening structures at said ends,
• wherein one or more of said dimensions of transverse surfaces of the strengthening structures at said connection joint is enlarged in relation to a dimension of a transverse surface at a location adjacent to said connection joint, such that said transverse cross section of said strengthening structure is enlarged at said connection joint compared to the location adjacent to said connection joint, and
• wherein an adhesive on the connection surfaces adheres the connection surfaces to each other.

A wind turbine blade section to be used in a wind turbine blade, wherein said blade section comprises:

• a strengthening structure comprising at least one of an internal beam strengthening structure, an internal strengthening structure at the trailing edge, or an internal strengthening structure of a surface shell structure with an end including a connection surface for connection to another blade section at a connection joint, wherein said end is at least partially shaped as dentated ends, said strengthening structure extending along a longitudinal direction of the wind turbine blade section and defining a transverse cross section oriented transverse to the longitudinal direction,
• one or more relevant dimensions of said surface being larger than dimensions of transverse surfaces of the strengthening structures at said end,
• wherein one or more of said dimensions of transverse surfaces of the strengthening structures at said end is enlarged in relation to a dimension of a transverse surface at a location adjacent to the end and the connection joint, such that said transverse cross section of said strengthening structure is enlarged at the connection joint compared to the location adjacent to the connection joint, and
• wherein said structure end includes a connection surface applied with a connector concealed behind a removable cover.