STORAGE BATTERY MONITORING SYSTEM, BATTERY PACK, AND ELECTRIC VEHICLE

Embodiments of this application relate to the field of battery monitoring, and disclose a rechargeable battery monitoring system, a battery pack, and an electric vehicle. A rechargeable battery includes battery units and an MSD switch. The battery units are serial-connected, and the MSD switch is connected between adjacent battery units. The monitoring system includes a BMU and CMCs that are quantitatively equal to and in a one-to-one correspondence with the battery units. The CMCs are divided into several CMC groups that meet preset conditions. The monitoring system further includes daisy chain buses that are quantitatively equal to and in a one-to-one correspondence with the CMC groups. Each CMC group is connected to the BMU through one daisy chain bus. The preset conditions are: the battery units corresponding to the CMCs in each CMC group are serial-connected to form a battery unit group corresponding to the CMC group, and the MSD switch is connected between adjacent battery unit groups. This embodiment further provides a battery pack and an electric vehicle to avoid damage that may be caused to a chip on the CMC in a process of plugging or unplugging the MSD switch, and help the CMC accurately monitor the battery units in the rechargeable battery.