Battery pack
A battery pack according to the present disclosure is equipped with a battery case that accommodates a plurality of battery cells laminated on one another. The battery case includes a bottom wall that faces bottom surfaces of the battery cells, and four lateral walls that are connected to the bottom wall and that face lateral surfaces of the battery cells respectively. At least one of the four lateral walls includes a central portion that faces the battery cells, and a peripheral portion located around the central portion. The peripheral portion includes a fragile portion that is provided in the shape of a frame in such a manner as to cover the central portion and that is lower in rigidity than the central portion.
1 . A battery pack comprising:
a battery case that accommodates a plurality of battery cells laminated on one another, wherein
the battery case includes a bottom wall that faces bottom surfaces of the battery cells, and four lateral walls that are connected to the bottom wall and that face lateral surfaces of the battery cells respectively,
each of the four lateral walls includes a central portion that faces the battery cells, and a peripheral portion located around the central portion, and
each of the four lateral walls includes a fragile portion that is smaller in thickness than the peripheral portion and is provided in a shape of a frame in such a manner as to cover the central portion between the central portion and the peripheral portion and that is lower in rigidity than the central portion, and the fragile portion in each of the four lateral walls includes a recessed portion that is U-shaped in a plane of its respective lateral wall.
2 . The battery pack according to claim 1 , wherein the fragile portion of at least one of four lateral walls is formed as a groove in an outer surface of the at least one of the four lateral walls.
3 . The battery pack according to claim 1 , wherein the recessed portion of at least one of four lateral walls is formed in an inner surface of the at least one of the four lateral walls.
4 . The battery pack according to claim 1 , further comprising the plurality of battery cells, and wherein the fragile portion of at least one of four lateral walls is outward of the plurality of battery cells in a lamination direction.
5 . The battery pack according to claim 4 , wherein the fragile portion of the at least one of four lateral walls is below the plurality of battery cells in a vertical direction.
6 . A battery pack comprising:
a battery case that accommodates a plurality of battery cells laminated on one another, wherein
the battery case includes a bottom wall that faces bottom surfaces of the battery cells and four lateral walls that are connected to the bottom wall and that face lateral surfaces of the battery cells respectively,
at least one of the four lateral walls includes a central portion that faces the battery cells, and a peripheral portion located around the central portion,
the at least one of the four lateral walls includes a fragile portion that is smaller in thickness than the peripheral portion and is provided in a shape of a frame in such a manner as to cover the central portion between the central portion and the peripheral portion and that is lower in rigidity than the central portion, and the fragile portion is formed as a groove in an outer surface of the at least one of the four lateral walls, and
each of the four lateral walls includes the fragile portion, and the fragile portion in each of the four lateral walls includes a recessed portion that is U-shaped in a plane of its respective lateral wall.
7 . The battery pack according to claim 6 , wherein the fragile portion is a recessed portion formed in the shape of the frame.
8 . The battery pack according to claim 6 , further comprising the plurality of battery cells, and wherein the fragile portion is outward of the plurality of battery cells in a lamination direction.
9 . The battery pack according to claim 8 , wherein the fragile portion is below the plurality of battery cells in a vertical direction.