Battery storage tray and battery package

1. A battery storage tray, comprising:

a first pocket portion into which a first end portion of a columnar battery in a longitudinal direction is inserted,

wherein the first pocket portion has a cup shape including an opening, a side portion, and a bottom portion,

wherein the side portion includes a fitting portion, which fits to the columnar battery, and a groove, which defines a space between the groove and the columnar battery,

wherein the space defined by the groove is connected to the opening,

wherein the groove is formed, along a radial direction of the first pocket portion, radially outside from the side portion, and

wherein the groove has a depth thereof continuously reduced from the opening toward the bottom portion.

2. The battery storage tray according to claim 1 , wherein the groove extends from an end of the side portion at the opening toward an end of the side portion at the bottom portion.

3. The battery storage tray according to claim 1 , wherein the fitting portion includes a taper portion in which the first pocket portion has an inner diameter decreasing from an end portion at the opening toward the bottom portion.

4. The battery storage tray according to claim 3 , wherein the taper portion extends from the opening to a point in a range of greater than or equal to 10% to smaller than or equal to 90% of a depth of the first pocket portion, where the depth of the pocket first portion is a minimum distance from the opening to the bottom portion.

5. The battery storage tray according to claim 1 , wherein the bottom portion includes a through hole formed in an area including a center of the bottom portion.

6. The battery storage tray according to claim 1 , wherein the bottom portion has a bulge portion along an outer peripheral edge of the bottom portion, the bulge portion bulging in a direction away from the opening.

7. The battery storage tray according to claim 1 , wherein the battery storage tray includes, at an outer peripheral portion, a protrusion that protrudes toward an outer periphery.

8. A battery package, comprising:

a first battery storage tray disposed at a first end portion of a columnar battery in a longitudinal direction;

a second battery storage tray disposed at a second end portion of the columnar battery in the longitudinal direction;

an inner carton including an outer frame that surrounds outer peripheral portions of the first battery storage tray and the second battery storage tray; and

an outer carton having a box shape and housing the inner carton,

wherein the first battery storage tray comprises:

a first pocket portion into which a first end portion of a columnar battery in a longitudinal direction is inserted,

wherein the first pocket portion has a cup shape including an opening, a side portion, and a bottom portion,

wherein the side portion includes a fitting portion, which fits to the columnar battery, and a groove, which defines a space between the groove and the columnar battery,

wherein the space defined by the groove is connected to the opening, and

wherein the first battery storage tray includes, at an outer peripheral portion, a protrusion that protrudes toward an outer periphery,

wherein the second battery storage tray includes a second pocket portion into which a second end portion of the columnar battery is inserted, and

wherein the outer frame of the inner carton includes a recess or a through hole into which the protrusion is inserted.