Power freely-configurable plug-in battery pack, vehicle, and battery replacement method

A power freely-configurable plug-in battery pack, comprising:

• an installation box, wherein a plurality of cell channels are provided in the installation box;
• a plurality of cell modules, wherein each of the plurality of cell modules is pluggably installed in a corresponding one of the plurality of cell channels, and a cell quick-replacement connector is provided between the cell module and one of the plurality of cell channels;
• a controller;
• and
• a plurality of switches electrically connected to the plurality of cell modules, wherein the controller is electrically connected to the cell module through the cell quick-replacement connector and is configured to control on/off states of the plurality of switches to selectively configure the plurality of cell modules in a series connection, a parallel connection, or a series-parallel connection, based on working status information of the plurality of cell modules.