Pressure control valve structure and power storage module

A pressure control valve structure used for a power storage module having a plurality of internal spaces, the pressure control valve structure comprising:

• a bottom wall portion having a plurality of communication holes communicating with their associated internal spaces;
• a plurality of projections, each in a circular shape, protruding outwardly from an inner wall surface of the bottom wall portion so as to surround their associated communication holes;
• a plurality of elastic valve bodies each having a first end surface and a second end surface opposite from the first end surface, the elastic valve bodies closing their associated communication holes with the first end surfaces of the elastic valve bodies placed in contact with the projections;
• an outer peripheral wall portion protruding from the inner wall surface so as to surround the plurality of projections collectively;
• and
• a cover made of a resin and fixed to the outer peripheral wall portion, the cover having a flat inner surface that presses the second end surface of the elastic valve bodies so as to compress the elastic valve bodies towards their associated projections, wherein
• the cover has a thick-walled portion where the cover is made partially thick, the thick-walled portion being formed protruding outwardly from an outer surface of the cover opposite from the flat inner surface so that a distance from the inner surface to a protruded end of the thick-walled portion is greater than a distance from the inner surface to the outer surface in a thickness direction of the cover,
• the cover has a discharge port through which gas in the pressure control valve structure is discharged to an outside of the pressure control valve structure, the discharge port being formed in the outer surface of the cover,
• wherein the thick-walled portion includes first thick-walled portions that extend along an outline of the cover as viewed from a compression direction of the elastic valve bodies,
• a plurality of connecting projections each having a lattice-frame shape are formed in an outer wall surface of the bottom wall portion, and are spaced apart from each other in a direction in which the valve bodies are arranged so that a spaced portion is provided between connecting projections in the direction in which the valve bodies are arranged;
• the discharge port is formed in the cover so as to face a location where the spaced portion is provided.