Charging device and charging system

A charging system, comprising:

• a battery pack;
• and
• a charging device;
• wherein the charging device comprises:
• a housing;
• a power interface configured to access a power supply;
• and
• a charging interface disposed on the housing and detachably connectable to the battery pack;
• wherein the charging interface comprises:
• a charging terminal configured to be connected to a charging terminal of the battery pack;
• a communication terminal configured to be connected to a communication terminal of the battery pack to acquire communication information of the battery pack;
• and
• a communication module for receiving the communication information of the battery pack inputted via the communication terminal;
• wherein the charging interface further comprises:
• a communication protection module connected between the communication terminal and the communication module and configured to isolate an interference voltage signal higher than or equal to a preset voltage value to protect the communication module wherein the communication protection module comprises:
• a first protection unit connected between the communication terminal and the communication module and configured to isolate a first interference voltage signal higher than or equal to a first preset voltage value to protect the communication module;
• and
• a second protection unit disposed between the first protection unit and the communication terminal to absorb a second interference voltage signal higher than or equal to a second preset voltage value to protect the communication module.