Abstract: An electronic device is provided, the electronic device includes a primary device assembly and an extension assembly. The primary device assembly includes a first housing and a primary body circuit, the first housing has a first accommodation cavity, and the primary body circuit is disposed in the first accommodation cavity. The extension assembly includes a second housing and an extension circuit. The second housing has a second accommodation cavity, the extension circuit is disposed in the second accommodation cavity, and the extension circuit is signal-connected to the primary body circuit, to extend or enhance functionality of the primary device assembly.

Abstract: Embodiments of this application provide a heat dissipation structure, a vehicle-mounted device, and a terminal device, which are used in the field of heat dissipation technologies. The heat dissipation structure includes a heat sink; a circuit board including at least one chip mounting region and at least one first position located outside the chip mounting region; at least one fixed connection structure located in the at least one first position and fastens the circuit board to the heat sink; and at least one elastic connection structure configured to provide an elastic force toward the heat sink for the chip mounting region.

Abstract: A junction box and an electronic device assembly system relate to the field of infrastructure technologies. The junction box includes an accommodation chamber configured to accommodate a wire and a sealing cap configured to seal the wire. An upper cover of the accommodation chamber is provided with a first through-hole for wiring, a base of the accommodation chamber is provided with a second through-hole for wiring, and a side wall of the accommodation chamber is provided with one or more operation windows. The upper cover of the accommodation chamber is provided with a first installation position for installing to a pole, and the base of the accommodation chamber is provided with a second installation position for installing to an electronic device. The sealing cap includes a third through-hole for wiring and a fourth through-hole for wiring.

Abstract: An electronic device is provided, the electronic device includes a primary device assembly and an extension assembly. The primary device assembly includes a first housing and a primary body circuit, the first housing has a first accommodation cavity, and the primary body circuit is disposed in the first accommodation cavity. The extension assembly includes a second housing and an extension circuit. The second housing has a second accommodation cavity, the extension circuit is disposed in the second accommodation cavity, and the extension circuit is signal-connected to the primary body circuit, to extend or enhance functionality of the primary device assembly.

Abstract: A junction box and an electronic device assembly system relate to the field of infrastructure technologies. The junction box includes an accommodation chamber (1) configured to accommodate a wire and a sealing cap (2) configured to seal the wire. An upper cover (11) of the accommodation chamber (1) is provided with a first through-hole (111) for wiring, a base (12) of the accommodation chamber (1) is provided with a second through-hole (121) for wiring, and a side wall (13) of the accommodation chamber (1) is provided with one or more operation windows (131). The upper cover (11) of the accommodation chamber (1) is provided with a first installation position for installing to a pole, and the base (12) of the accommodation chamber (1) is provided with a second installation position for installing to an electronic device.