| 摘要 |
According to one embodiment, a battery unit comprises a plurality of battery cells; and a casing having an upper and lower walls. The casing comprises a first portion that stores at least one battery cell; a second portion that stores at least one battery cell; and a third portion that connects the first portion and the second portion to each other. The third portion is at least partially formed to be thinner than the first and second portions. The third portion has therein a rib extending between the upper wall and lower walls.
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