The concave opening 1524 is formed on the concave sidewall 1511 of the first concave portion 151. The first concave sidewall 1521 is opposite to the concave opening 1524, and the second concave sidewall 1522 and the third concave sidewall 1523 are opposite to each other. In this way, the second concave bottom 1525 and the three concave sidewalls 1521, 1522, 1523 surround to form a second accommodating space. The second accommodating space has an opening 1524. The first accommodating space is communicated with the second accommodating space through the concave opening 1524.
It should be noted that, in the present disclosure, the expression “shielding cover accessory” may refer to a part of the shielding cover connected with a bracket. For example, the shielding cover accessory may be a separate sheet metal part which is fixedly connected to the shielding cover body through a fixing element.