US Patent 10566833 External battery backup unit

An external battery backup unit includes a battery cell set, a power relay, a charging controller, a voltage and current monitoring unit, a microcontroller and a signaling coupling unit. The charging controller is configured to monitor the status of the battery cell set and the power relay in order to determine a charging current's amplitude. The voltage and current monitoring unit monitors the status of the battery cell set to control a discharging current's amplitude. The microcontroller is configured to respond to the change of state of the charging controller, the voltage and current monitoring unit, and the battery cell set. The microcontroller further generates the external battery backup unit's system information and encapsulates it into data envelopes. The signaling coupling unit is configured to embed the data envelopes into the power transmitted to the backend system.