Auxiliary device and electronic system

An auxiliary device, comprising:

• a case body;
• and
• a control assembly;
• wherein the case body defines an accommodating cavity, the accommodating cavity defines an opening at one side thereof, and the accommodating cavity is configured to accommodate a mobile terminal;
• the control assembly is disposed in the accommodating cavity, and the control assembly is communicatively connected to the mobile terminal;
• and
• the control assembly comprises a transceiver module, a processing module, and an operation module, the processing module is respectively electrically connected to the transceiver module and the operation module, the transceiver module is communicatively connected to the mobile terminal, the operation module is configured to send an operation signal to the processing module, the processing module is configured to receive the operation signal and send the operation signal to the mobile terminal through the transceiver module,
• wherein the operation module comprises a button portion, a through hole is defined on a first edge side of the case body, and the button portion is disposed in the through hole and is exposed to an exterior of the case body,
• wherein a charging position is disposed on a second edge side of the case body, the control assembly further comprises a power supply module and a charging connector configured with a charging cable;
• the power supply module comprises a lithium battery, a positive charging contact, a negative charging contact, a first alignment magnetic attraction component, and a second alignment magnetic attraction component;
• the lithium battery is disposed in the accommodating cavity, and the positive charging contact, the negative charging contact, the first alignment magnetic attraction component, and the second alignment magnetic attraction component are disposed at the charging position and are exposed to the exterior of the case body;
• the charging connector comprises a positive charging elastic pin, a negative charging elastic pin, a third alignment magnetic attraction component, and a fourth alignment magnetic attraction component;
• the positive charging elastic pin is matched with the positive charging contact, the negative charging elastic pin is matched with the negative charging contact, the third alignment magnetic attraction component is matched with the first alignment magnetic attraction component, and the fourth alignment magnetic attraction component is matched with the second alignment magnetic attraction component;
• and
• the transceiver module further comprises a wireless communication mainboard, the wireless communication mainboard is disposed at a bottom of the accommodating cavity, the operation module further comprises a button mainboard, the button mainboard is matched with the button portion, the button mainboard is disposed on an inner side wall of the accommodating cavity and is disposed at the through hole.