A gap inspection apparatus , characterized by being configured for a wound battery cell , wherein in a height direction(P1) 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 (L1) 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 (L1) 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 . <EOS>