SEALED BATTERY
In a sealed battery provided with an electrode body and a battery case accommodating the electrode body, the battery case includes a case body having an opening and accommodating the electrode body, and a plate-shaped lid closing the opening of the case body. The lid includes a safety valve made of resin. The safety valve is formed with a ring-shaped groove that is recessed in a thickness direction of the lid and has a ring shape in plan view. In the safety valve, a thinnest portion having a thinnest thickness in the safety valve includes a ring-shaped thinnest portion of a ring shape in plan view including the bottom of the ring-shaped groove.
1 . A sealed battery comprising:
an electrode body; and
a battery case accommodating the electrode body,
wherein
the battery case includes:
a case body having an opening and accommodating the electrode body; and
a lid having a plate shape and closing the opening of the case body,
the lid includes a safety valve made of resin,
the safety valve includes a groove recessed in a thickness direction of the lid, and the groove includes a ring-shaped groove having a ring shape in plan view, and
the safety valve includes a thinnest portion having a thinnest thickness in the safety valve, and the thinnest portion includes a ring-shaped thinnest portion having a ring shape in plan view including a bottom of the ring-shaped groove.
2 . The sealed battery according to claim 1 , wherein
the ring-shaped groove is a circular ring-shaped groove having a circular ring shape in plan view, and
the ring-shaped thinnest portion is a circular ring-shaped thinnest portion having a circular ring shape in plan view.
3 . The sealed battery according to claim 1 , wherein
the groove of the safety valve includes the ring-shaped groove and further a straight groove having a straight line shape in plan view that bisects a region bounded by the ring-shaped groove in plan view, and
the thinnest portion of the safety valve includes the ring-shaped thinnest portion and further a straight thinnest portion having a straight line shape in plan view including a bottom of the straight groove.
4 . The sealed battery according to claim 2 , wherein
the groove of the safety valve includes the ring-shaped groove and further a straight groove having a straight line shape in plan view that bisects a region bounded by the ring-shaped groove in plan view, and
the thinnest portion of the safety valve includes the ring-shaped thinnest portion and further a straight thinnest portion having a straight line shape in plan view including a bottom of the straight groove.