Battery pack and method for producing the battery pack
A battery pack includes a battery stack including a plurality of battery cells and a case member in which the battery stack is housed. The case member includes an end wall part located on one end of the battery stack in a stacking direction and continuously integrated with a floor part, and a mounting-shape part located on an opposite end from the end wall part and configured to mount a panel-shaped member. The battery stack is retained in the case member while being held by compression between the end wall part and the end panel on the other end. The end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, and fixed therein.
1. A battery pack comprising:
a battery stack including a plurality of battery cells stacked one on another;
a case member in which the battery stack is housed, the case member including:
a floor part located under the battery stack,
an end wall part located on one end in a stacking direction of the battery cells, the end wall part being continuously integrated with the floor part, and
a mounting-shape part located on an end opposite from the end wall part, the mounting-shape part being configured to mount a panel-shaped member; and
an end panel, which is the panel-shaped member, mounted in the mounting-shape part; wherein
the battery stack is retained in the case member while being held by compression between the end wall part and the end panel,
the end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, so that the end panel is fixed in the mounting-shape part,
the mounting-shape part of the case member includes a plurality of mounting-shape parts that are located at a plurality of positions on the opposite end of the case member from the end wall part, and
the end panel is mounted in one of the plurality of mounting-shape parts.
2. A battery pack comprising:
a battery stack including a plurality of battery cells stacked one on another;
a case member in which the battery stack is housed, the case member including:
a floor part located under the battery stack,
an end wall part located on one end in a stacking direction of the battery cells, the end wall part being continuously integrated with the floor part, and
a mounting-shape part located on an end opposite from the end wall part, the mounting-shape part being configured to mount a panel-shaped member; and
an end panel, which is the panel-shaped member, mounted in the mounting-shape part; wherein
the battery stack is retained in the case member while being held by compression between the end wall part and the end panel,
the end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, so that the end panel is fixed in the mounting-shape part,
each of the battery cells includes a terminal on an upper surface of the battery cell,
the floor part includes an aligning-shape part configured to align the battery cells of the battery stack in the stacking direction, and
the battery stack further includes an engagement member for each of the battery cells, the engagement member being configured to engage with the aligning-shape part.
3. The battery pack according to claim 1 , wherein
the floor part includes an aligning-shape part configured to align the battery cells of the battery stack in the stacking direction, and
the battery stack further includes an engagement member for each of the battery cells, the engagement member being configured to engage with the aligning-shape part.
4. A method for producing a battery pack, the battery pack comprising a battery stack including a plurality of battery cells and a case member in which the battery stack is housed, the case member including:
a floor part located under the battery stack;
an end wall part located on one end in a stacking direction of the battery cells, the end wall part being continuously integrated with the floor part; and
a mounting-shape part located on an end opposite from the end wall part, the mounting-shape part being configured to mount a panel-shaped member;
the method comprising:
inserting the battery stack into the case member while compressing the battery stack in the stacking direction, and pressing one end of the battery stack in the stacking direction against the end wall part;
mounting an end panel in the mounting-shape part; and
releasing the battery stack from the compressing to allow an opposite end of the battery stack in the stacking direction to press against the end panel so that:
the battery stack is housed in the case member while being held by compression between the end wall part and the end panel, and
the end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, and is fixed in the mounting-shape part; wherein
the mounting-shape part of the case member includes a plurality of mounting-shape parts that are located at a plurality of positions on the opposite end of the case member from the end wall part,
the pressing of the battery stack against the end wall part is performed by moving forward the battery stack from a side of the mounting-shape part toward the end wall part,
the compressing of the battery stack is performed until at least a part of the plurality of mounting-shape parts, which is hidden by the battery stack before the battery stack is compressed, becomes exposed, and
the mounting is performed by mounting the end panel in one of the mounting-shape parts, which is exposed when the battery stack is compressed.
5. A method for producing a battery pack, the battery pack comprising a battery stack including a plurality of battery cells and a case member in which the battery stack is housed, the case member including:
a floor part located under the battery stack;
an end wall part located on one end in a stacking direction of the battery cells, the end wall part being continuously integrated with the floor part; and
a mounting-shape part located on an end opposite from the end wall part, the mounting-shape part being configured to mount a panel-shaped member;
the method comprising:
inserting the battery stack into the case member while compressing the battery stack in the stacking direction, and pressing one end of the battery stack in the stacking direction against the end wall part;
mounting an end panel in the mounting-shape part; and
releasing the battery stack from the compressing to allow an opposite end of the battery stack in the stacking direction to press against the end panel so that:
the battery stack is housed in the case member while being held by compression between the end wall part and the end panel, and
the end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, and is fixed in the mounting-shape part; wherein
each of the battery cells includes a terminal on an upper surface of the battery cell,
the floor part of the case member includes an aligning-shape part configured to align the battery cells of the battery stack in the stacking direction,
the battery stack further includes an engagement member for each of the battery cells, the engagement member being configured to engage with the aligning-shape part, and
the pressing of the battery stack against the end wall part is performed while bringing the engagement member and the aligning-shape part into engagement with each other.
6. The method for producing a battery pack according to claim 4 , wherein
the floor part of the case member includes an aligning-shape part configured to align the battery cells of the battery stack in the stacking direction,
the battery stack further includes an engagement member for each of the battery cells, the engagement member being configured to engage with the aligning-shape part, and
the pressing of the battery stack against the end wall part is performed while bringing the engagement member and the aligning-shape part into engagement with each other.