CHARGING SYSTEM AND BATTERY PACK

A charging system includes: an electrical energy conversion apparatus and multiple electrical energy receiving apparatuses connected in cascade, where the charging system is configured to charge a battery pack electrically connected to an electrical energy receiving apparatus; and a communication module, where the charging system is configured to establish a communication connection and perform data interaction with an external device through the communication module. The communication module includes one or more communication submodules. A communication submodule is configured to broadcast out broadcast information carrying a data-to-be-transmitted identifier. The external device or another communication submodule is configured to, after scanning the broadcast information, actively establish a communication connection with the communication submodule broadcasting out, so as to acquire to-be-transmitted data of the communication submodule.