A gap inspection apparatus, characterized by being configured for a wound battery cell, wherein in a height direction of the wound battery cell, the wound battery cell comprises a wound body portion and a tab that are connected to each other, and the gap inspection apparatus comprises: an X-ray source and an X-ray detector that are oppositely disposed, and a bearing mechanism located between the X-ray source and the X-ray detector; wherein the bearing mechanism comprises at least one accommodating groove, the accommodating groove is configured to accommodate the wound battery cell, and the height direction of the wound battery cell crosses a first direction in which the X-ray source points to the X-ray detector; and the X-ray source is configured to irradiate an arc-shaped area of the wound body portion, and the X-ray detector is configured to obtain an imaging image of the irradiated arc-shaped area, so as to obtain a gap value between two electrode plates within the arc-shaped area based on the imaging image; wherein the bearing mechanism comprises a bearing member and a cushion fastener, an accommodating cavity is comprised on a side of the bearing member facing the X-ray source or the X-ray detector, the cushion fastener is located in the accommodating cavity, and the accommodating groove is disposed on the cushion fastener; characterized in that: the accommodating groove comprises a first accommodating sub-groove and a second accommodating sub-groove that communicate with each other, the first accommodating sub-groove is configured to accommodate the wound body portion, and the second accommodating sub-groove is configured to accommodate the tab, wherein a preset distance is present between the wound body portion and an inner wall of the first accommodating sub-groove, and a preset distance is present between the tab and an inner wall of the second accommodating sub-groove. an X-ray source and an X-ray detector that are oppositely disposed, and a bearing mechanism located between the X-ray source and the X-ray detector; wherein the bearing mechanism comprises at least one accommodating groove, the accommodating groove is configured to accommodate the wound battery cell, and the height direction of the wound battery cell crosses a first direction in which the X-ray source points to the X-ray detector; and the X-ray source is configured to irradiate an arc-shaped area of the wound body portion, and the X-ray detector is configured to obtain an imaging image of the irradiated arc-shaped area, so as to obtain a gap value between two electrode plates within the arc-shaped area based on the imaging image; wherein the bearing mechanism comprises a bearing member and a cushion fastener, an accommodating cavity is comprised on a side of the bearing member facing the X-ray source or the X-ray detector, the cushion fastener is located in the accommodating cavity, and the accommodating groove is disposed on the cushion fastener; characterized in that: the accommodating groove comprises a first accommodating sub-groove and a second accommodating sub-groove that communicate with each other, the first accommodating sub-groove is configured to accommodate the wound body portion, and the second accommodating sub-groove is configured to accommodate the tab, wherein a preset distance is present between the wound body portion and an inner wall of the first accommodating sub-groove, and a preset distance is present between the tab and an inner wall of the second accommodating sub-groove.