The invention relates to a battery pack, including: a battery pack cover; a battery pack base; a cell group including several cells; a battery terminal connector; a mounting cavity, the mounting cavity being formed with a socket for inserting housing terminals to be electrically connected to battery pack terminals; a locking apparatus, capable of driving the battery pack and an electric tool be locked connection or released, a seal member blocking a passage from the socket to the cell group is disposed inside the mounting cavity; the battery pack includes a battery pack housing seal member blocking communication between the outside and the mounting cavity, and the battery pack housing seal member is disposed at a joint between the battery pack cover and the battery pack base; and the locking apparatus is mounted on a battery pack housing and isolated outside the mounting cavity.
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