A solid particulate capturing device comprises a first plate (2) having at least one inlet section (6) for an exhaust gas flow, a second plate (3), parallel to the first (2), having at least one outlet section (7) for the exhaust gas flow. The first (2) and the second plate (3) are axially spaced apart and form, with an annular lateral wall (4), interposed between the first (2) and the second plate (3), an entrapment chamber (5) for solid particulate conveyed in suspension in the exhaust gas flow produced by a battery. The outlet section (7) present on the second plate (3) is axially out of alignment with the inlet section (6) present on the first plate (2), in such a way that the inlet section (6) faces a solid portion (8) of the second plate (3) which acts as an obstructing surface for the solid particulate.