The present invention discloses a battery case device for a battery detachable electric vehicle. A battery case device for a battery detachable electric vehicle disclosed is a battery case coupled to a vehicle body and having a plurality of battery installation spaces in which a battery cell is installed therein, and a battery case penetrated to the vehicle body to fix the battery case to the vehicle body. A case vehicle body fixing part, a battery detachment part provided in the battery case so that the battery cell can be detached from the battery case, and a shock absorbing buffer part provided in the battery case to absorb external shocks are provided.
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